CN220189854U

CN220189854U - Battery cell, battery and electricity utilization device

Info

Publication number: CN220189854U
Application number: CN202320386703.7U
Authority: CN
Inventors: 林文法; 罗伟杰; 唐鸣浩; 张盛武
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2023-03-03
Filing date: 2023-03-03
Publication date: 2023-12-15
Anticipated expiration: 2033-03-03

Abstract

The utility model discloses a battery monomer, a battery and an electricity utilization device, wherein the battery monomer comprises: the shell assembly comprises a shell and a first pole, the shell comprises a shell body and a shell cover, the shell body is provided with an opening, the shell cover is covered on the opening, and the shell body is provided with the first pole; the battery cell assembly comprises an active material coating part and a conductive part, wherein the active material coating part is accommodated in the shell body, and the conductive part is electrically connected with the active material coating part and the first pole. The battery monomer provided by the embodiment of the utility model can reduce the stress at the welding seam of the shell body and the shell cover, effectively reduce the probability of cracking at the welding seam of the shell body and the shell cover in the use process of the battery, and improve the reliability of the battery monomer.

Description

Battery cell, battery and electricity utilization device

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery monomer, a battery and an electric device.

Background

In recent years, new energy automobiles have been developed dramatically, and in the field of electric automobiles, batteries play an important role as a power source of the electric automobiles. How to improve the reliability of the battery cell is a problem to be solved.

Disclosure of Invention

The embodiment of the application provides a battery cell, a battery and an electricity utilization device, which are beneficial to improving the reliability of the battery cell.

In a first aspect, an embodiment of the present application provides a battery cell, including: the shell assembly comprises a shell and a first pole, the shell comprises a shell body and a shell cover, the shell body is provided with an opening, the shell cover is covered on the opening, and the shell body is provided with the first pole; the battery cell assembly comprises an active material coating part and a conductive part, wherein the active material coating part is accommodated in the shell body, and the conductive part is electrically connected with the active material coating part and the first pole.

In the above technical solution, in the battery, because the first poles of any adjacent battery cells are connected with each other, when the battery vibrates or deforms, the first poles between any adjacent battery cells will pull each other, and at this time, because the first poles are disposed on the housing, the acting force received by the first poles will be preferentially transferred to the housing, and will not directly act on the housing cover; on one hand, the distance between the acting force and the welding seam of the shell body and the shell cover can be prolonged, on the other hand, the shell body can be deformed preferentially when stressed, so that the stress of the welding seam of the shell body and the shell cover is reduced, the probability of cracking of the welding seam of the shell body and the shell cover in the use process of the battery is effectively reduced, and the reliability of the battery is improved.

In some embodiments, the first pole is provided with a receiving portion, at least part of the conductive portion being received in the receiving portion.

In the above technical solution, on the one hand, the first pole is provided with the accommodating portion, so that the weight of the first pole can be reduced to a certain extent, and the weight energy density of the battery cell and the battery can be improved; on the other hand, at least part of the conductive part is accommodated in the accommodating part to occupy the space in the first pole, so that the occupied space of the conductive part in the shell can be reduced, and when the size of the shell is fixed, some space can be saved in the shell to accommodate the active material coating part with larger size, and the volume energy density of the battery cell is improved; meanwhile, at least part of the conductive part is accommodated in the accommodating part, so that the occupied space of the battery monomer can be reduced, and the battery with the same volume can accommodate more battery monomers, thereby improving the volume energy density of the battery; in addition, at least part of the conductive part is accommodated in the accommodating part, so that the redundancy of the conductive part in the shell can be reduced to a certain extent, the probability of short circuit between the conductive part and the active material coating part is reduced, the probability of short circuit of the battery cell assembly is reduced, and the working reliability and stability of the battery cell and the battery are further improved; at least part of the conductive part is accommodated in the accommodating part of the first pole, so that the conductive part is convenient to connect with the first pole.

In some embodiments, the accommodating portion has a first accommodating groove, a surface of the first electrode toward the active material coating portion side is an electrode inner end surface, a notch of the first accommodating groove is formed on the electrode inner end surface, and at least a portion of the conductive portion is accommodated in the first accommodating groove.

In the technical scheme, on one hand, the first accommodating groove is formed in the first pole, so that the weight of the first pole can be reduced to a certain extent, and the weight energy density of the battery monomer and the battery can be improved; on the other hand, as the notch of the first accommodating groove is formed on the inner end surface of the pole, and the inner end surface of the pole is the surface of the first pole, which is close to one side of the active material coating part, the first accommodating groove can be opened towards the direction of the active material coating part, so that the conductive part can conveniently extend into the first accommodating groove, and the assembly efficiency is improved; meanwhile, as the first accommodating groove faces the active material coating part, the first accommodating groove can also serve as a buffering and temporary storage structure of electrolyte, so that more electrolyte can be accommodated in the shell, and as the electrolyte is lost in the charging and discharging processes of the battery cells, the service life of the battery cells can be prolonged when the electrolyte is more; and because the first accommodating groove faces the active material coating part, the first accommodating groove can also be used as an accommodating and buffering structure of gas generated in the battery cell assembly, so that the expansion of the battery cell is reduced, and the reliability and stability of the battery cell are improved; in addition, the first accommodating groove is positioned at the inner side of the pole, and foreign matter impurities outside the first accommodating groove are not easy to enter the first accommodating groove, so that the influence of the foreign matter impurities outside the first accommodating groove on the battery cell assembly can be reduced, the working stability and reliability of the battery cell assembly can be ensured, and the stability and reliability of the battery cell and the battery are further improved; the first accommodation groove is located the inboard of utmost point post, and at least part of electrically conductive portion holds in first accommodation groove to be convenient for follow utmost point post inboard and carry out spacingly to electrically conductive portion, be convenient for electrically conductive portion and first utmost point post are connected.

In some embodiments, the housing has a mounting hole therein, the first pole being mounted to the mounting hole; along the axial direction of the first pole, the depth H1 of the first accommodating groove is larger than or equal to the minimum distance H2 from the inner end surface of the pole to the mounting hole.

In the technical scheme, the depth of the first accommodating groove is larger than or equal to the minimum distance from the inner end surface of the pole to the mounting hole in the axial direction of the first pole, so that the volume of the first pole can be fully utilized, the first accommodating groove has larger depth, more conductive parts can be accommodated, the occupied space of the conductive parts in the shell can be reduced to a greater extent, the energy density of the battery monomer is further improved, and the redundancy of the conductive parts in the shell is further reduced; meanwhile, the first containing groove has a larger depth, so that gas production of the battery cell assembly can be contained, reliability and stability of the battery cell are guaranteed, more electrolyte can be contained, and service life of the battery cell can be guaranteed.

In some embodiments, the accommodating portion includes a first end wall and a first side wall, the first end wall is located on a side of the first side wall away from the active material coating portion, the first end wall and the first side wall enclose a first accommodating groove, and an electrical connection position between the conductive portion and the first pole is located on the first end wall and/or the first side wall.

In the above technical scheme, the electric connection position between the conductive part and the first pole is arranged on at least one of the first end wall and the first side wall, so that the first accommodating groove has the effect of accommodating at least part of the conductive part and also has the effect of realizing electric connection with the conductive part, the structure of the first pole can be simplified, the processing of the first pole is convenient, the structure of the conductive part can be simplified, the redundancy of the conductive part is reduced, and the cost of the conductive part is reduced. The groove wall of the first accommodating groove is used for realizing electric connection with the conductive part, so that the electric connection area between the conductive part and the first pole can be relatively larger, the difficulty of electric connection can be reduced, the reliability and stability of electric connection can be improved, and the performance of the battery cell can be further improved; the electrically conductive portion and the first end wall are connected from the outside when the electrically connecting position of the electrically conductive portion and the first pole is located at the first end wall.

In some embodiments, the first end wall has a first countersink thereon, and at least a portion of the location where the conductive portion is electrically connected to the first end wall is located within the first countersink.

In the technical scheme, on one hand, the first sinking groove is arranged on the first end wall, so that the first sinking groove can be used for realizing the pre-positioning of the conductive part, the electric connection can be realized by being beneficial to finding the position, and the production efficiency is improved; on the other hand, through setting up first heavy groove on first end wall, can locally reduce the local wall thickness of first end wall, not only be favorable to carrying out the welding electricity and connect, still be favorable to alleviateing the weight of first utmost point post, improve battery cell's weight energy density.

In some embodiments, the first electrode post has a first groove, a side surface of the first electrode post remote from the active material coating portion is an electrode post outer end surface, and a notch of the first groove is formed on the electrode post outer end surface.

In the above technical solution, on the one hand, the first pole is provided with the first groove, so that the weight of the first pole can be further reduced, and the weight energy density of the battery cell and the battery can be improved; on the other hand, the first groove is arranged on the outer side of the first pole, and can be used for accommodating or installing structural parts of each battery monomer in the battery, so that the space in the first pole is fully utilized, and the space utilization rate and the volume energy density of the battery are improved. In addition, because have first holding tank and first recess simultaneously on the first utmost point post, first recess is located the one side of keeping away from active material coating portion of first holding tank, and first recess orientation is opened in the direction of deviating from first holding tank to be favorable to carrying out the electricity to the cell wall of electrically conductive portion and first holding tank from the outside of first utmost point post through first recess, for example can be convenient for carry out outside welding through first recess to first utmost point post and electrically conductive portion, the processing and the manufacturing of battery monomer of being convenient for can save the cost of processing and manufacturing.

In some embodiments, the housing assembly further comprises a slot cover disposed on the first pole and closing the slot of the first recess.

In the above technical scheme, can be convenient for the electric connection of adjacent battery monomer in the battery through setting up the capping, and because the battery monomer is separated through first recess with the electric connection position of electric part and first utmost point post with the position of battery monomer electric connection, interfere less between the two, can further improve battery monomer stability and reliability. Simultaneously, the groove cover can also prevent foreign matters from entering the first groove, interference of external foreign matters on the battery cell assembly can be reduced, and reliability and stability of the battery cell can be further improved.

In some embodiments, the accommodating portion has a second accommodating groove, the surface of the first pole far away from the side of the active material coating portion is a pole outer end surface, a notch of the second accommodating groove is formed on the pole outer end surface, the second accommodating groove is communicated with the inside of the shell through a first perforation, and the conductive portion penetrates through the first perforation and is at least partially accommodated in the second accommodating groove.

In the technical scheme, on one hand, the first pole is provided with the second accommodating groove, so that the weight of the first pole can be reduced to a certain extent, and the weight energy density of the battery monomer and the battery can be improved; on the other hand, because the notch of second holding tank forms on the terminal surface outside the utmost point post, and the terminal surface is the surface of keeping away from active material coating portion one side of first utmost point post outside the utmost point post to make the second holding tank can open towards the direction that deviates from active material coating portion, like this, when holding the at least part of electrically conductive portion in the second holding tank, thereby can realize the accomodating arrangement to electrically conductive portion through the notch of second holding tank easily, perhaps to electrically conductive portion and the operation etc. of first utmost point post electricity connection, and then can reduce the single production degree of difficulty of battery, improve single production efficiency of battery. Meanwhile, the second accommodating groove can be communicated with the shell through the first perforation, so that the second accommodating groove can also serve as a buffering and temporary storage structure of electrolyte, more electrolyte can be accommodated in the shell, and the electrolyte can be lost in the process of charging and discharging the battery monomer, so that the service life of the battery monomer can be prolonged when the electrolyte is more; and also because the second holding tank can be through first perforation and casing intercommunication, the holding of second holding tank also can be as the inside gas production of electricity core subassembly holds and buffer structure, reduces the single inflation of battery, improves single reliability and the stability of battery.

In some embodiments, the electrical connection location of the conductive portion and the first pole is located on a hole wall of the first through hole formed in the accommodating portion.

In the above technical solution, when the electrical connection position of the conductive portion and the first pole is set on the hole wall of the first through hole, the conductive portion and the first pole may be electrically connected through the second accommodating groove; meanwhile, the first perforation can be sealed at the electric connection position of the conductive part and the first polar column, so that the sealing cost is saved, and the electrolyte leakage is reduced.

In some embodiments, the accommodating portion includes a second end wall and a second side wall, the second end wall is located on a side of the second side wall, which is close to the active material coating portion, the second end wall and the second side wall enclose to form a second accommodating groove, the first through hole is formed in the second end wall, and an electrical connection position of the conductive portion and the first pole is located on the second end wall and/or on the second side wall.

In the above technical scheme, the electric connection position between the conductive part and the first pole is arranged on at least one of the second end wall and the second side wall, so that the second accommodating groove has the effect of accommodating at least part of the conductive part, and the groove wall of the second accommodating groove also has the effect of realizing electric connection with the conductive part, thereby simplifying the structure of the first pole and facilitating the processing of the first pole. And because the first perforation is arranged on the second end wall, the conductive part can conveniently extend into the second accommodating groove through the first perforation, the structure of the conductive part can be simplified, the redundancy of the conductive part is reduced, and the cost of the conductive part is reduced. And, the notch opening direction of second holding tank makes can be easily through the notch of second holding tank to conducting part and the cell wall of second holding tank carry out the electric connection operation, can reduce the degree of difficulty of electric connection to utilize the cell wall of second holding tank to realize being connected with conducting part's electricity, can make conducting part and the region that first utmost point post electricity is connected great relatively, can improve reliability and the stability of electric connection, and then promote single performance of battery.

In some embodiments, the second end wall has a second countersink thereon, and at least a portion of the location where the conductive portion is electrically connected to the second end wall is located within the second countersink.

In the technical scheme, the second sinking groove is formed in the second end wall, so that the second sinking groove can be used for realizing the pre-positioning of the conductive part, the electric connection can be realized by being beneficial to finding the accurate position, and the production efficiency is improved.

In some embodiments, the housing has a mounting hole, the first pole is mounted in the mounting hole, and a depth H3 of the second receiving groove is greater than or equal to a minimum distance H4 from an outer end surface of the pole to the mounting hole along an axial direction of the first pole.

In the technical scheme, the depth of the second accommodating groove is larger than or equal to the minimum distance from the outer end face of the pole to the mounting hole in the axial direction of the first pole, so that the volume of the first pole can be fully utilized, the second accommodating groove has larger depth, more conductive parts can be accommodated, the occupied space of the conductive parts in the shell can be reduced to a greater extent, the energy density of the battery monomer is further improved, and the redundancy of the conductive parts in the shell is further reduced; meanwhile, the second containing groove has a larger depth, so that gas production of the battery cell assembly can be contained, reliability and stability of the battery cell are improved, more electrolyte can be contained, and service life of the battery cell can be prolonged.

In some embodiments, the housing assembly further includes a first cover plate that mates with the first pole and closes the slot of the second receiving slot, the first cover plate being electrically connected to the first pole.

In the technical scheme, the notch of the second accommodating groove is sealed by the first cover plate, so that electrolyte in the shell can be prevented from leaking from the notch of the second accommodating groove, and the notch of the second accommodating groove is sealed by the first cover plate and is electrically connected with the first pole, so that indirect electrical connection between the first pole and the converging component of the battery can be easily realized by using the first cover plate, the connection area of the electrical connection part is increased, and the resistance of the electrical connection part is reduced.

In some embodiments, the first cover plate includes a first conductive member and a second conductive member, which are made of different materials, the first conductive member is matched with and electrically connected to the first pole, and the second conductive member is matched with and electrically connected to the first conductive member.

In the above technical scheme, the first cover plate is set to be in a composite form, and the first conductive piece is set to be the same as the material of the first pole, so that the first conductive piece is convenient to be electrically connected with the first pole, and the second conductive piece is convenient to be electrically connected with the bus component of the battery with the material different from that of the first pole due to the fact that the material of the second conductive piece is different from that of the first conductive piece.

In some embodiments, the first conductive member has a second groove thereon, and the second conductive member is embedded in the second groove, and a notch of the second groove is formed on a surface of the first conductive member on a side away from the second receiving groove, so that the second conductive member is exposed from the notch of the second groove.

In the above technical scheme, on the one hand, through inlay the second conductive piece in locating first conductive piece to can reduce the assembly degree of difficulty of first conductive piece and second conductive piece, improve first conductive piece and second conductive piece complex stability and convenience, and can reduce the thickness of first apron, reduce the occupation of first apron to the space, with the single space utilization of improvement battery. On the other hand, the second conductive piece can be exposed from the surface of the first conductive piece, which is far away from the second accommodating groove, through the notch of the second groove, so that the second conductive piece is electrically connected with the bus component of the battery outside the first pole. In addition, as the notch of the second groove is formed on the surface of the first conductive member, which is far away from the second accommodating groove, the first conductive member can be isolated between the second accommodating groove and the second conductive member, so that the electrolyte entering the second groove is prevented from contacting the second conductive member, and leakage of the electrolyte is reduced.

In some embodiments, the first cover plate is embedded at the notch of the second accommodating groove.

In the above technical scheme, through inlay first apron in locating the second holding tank, can reduce the assembly degree of difficulty of first apron and first utmost point post, improve the reliability and the convenience of the assembly stability and the connection of first apron and first utmost point post, can reduce the space occupation outside the first apron to first utmost point post moreover. Moreover, as the first cover plate is embedded in the notch of the second accommodating groove, the second accommodating groove can be provided with a sufficient space for accommodating the conductive part.

In some embodiments, the wall surface of the first electrode column at the notch of the second accommodating groove is a guiding inclined surface, and the guiding inclined surface is used for guiding the first cover plate to be matched with the notch of the second accommodating groove.

In the technical scheme, the wall surface at the notch of the second accommodating groove is processed into the inclined surface with the guiding function, so that the assembly difficulty of the first cover plate and the second accommodating groove can be reduced, and the assembly efficiency of the first cover plate and the second accommodating groove is improved.

In some embodiments, the second receiving groove includes a first groove section and a second groove section located at a side of the first groove section near the outer end face of the pole, the cross-sectional area of the second groove section is larger than that of the first groove section to form a step surface between the first groove section and the second groove section, and the first cover plate is embedded in the second groove section and supported on the step surface.

In the above technical scheme, through setting up the second holding tank into the ladder groove form, can make first apron stable fit in the notch position of second holding tank, improve the connection stability of first apron and first utmost point post, can be through prescribing a limit to the groove depth of first slot segment moreover for have comparatively sufficient space in the second holding tank and hold conductive part.

In some embodiments, the first electrode post includes a first electrode post portion and a second electrode post portion that are made of different materials and are electrically connected, the second electrode post portion is located on a side of the first electrode post portion away from the active material coating portion, the accommodating portion is disposed on the first electrode post portion or is disposed on the first electrode post portion and the second electrode post portion, and the conductive portion is electrically connected with the first electrode post portion.

In the above technical scheme, through setting the first post to the compound form that forms by different material combinations, utilize the first post portion that is located the inboard to accomodate cooperation and electricity with the electrically conductive portion and be connected, utilize the second post portion that is located the outside to be connected with the electrical connection such as the converging part of battery to be favorable to realizing the assembly and the electrical connection of first post and relevant part, reduce the electric hookup location of post and electrically conductive portion, with the mutual interference between the electric hookup location of converging part of post and battery, improve battery monomer's reliability and stability.

In some embodiments, the accommodating portion has a fourth accommodating groove, the surface of the first pole far away from the side of the active material coating portion is a pole outer end surface, a notch of the fourth accommodating groove is formed on the pole outer end surface, the fourth accommodating groove is communicated with the inside of the housing through a second through hole, the conductive portion penetrates through the second through hole, and the electric connection position of the conductive portion and the first pole is located on a hole wall of the second through hole formed by the accommodating portion.

In the above technical solution, by providing the fourth receiving groove, the electrical connection of the conductive portion and the hole wall of the second through hole can be easily achieved. Also in some cases, sealing of the second perforation may be achieved with an electrical connection of the conductive portion to the first pole.

In some embodiments, the battery cell further comprises: the support is located in the shell and located on one side, close to the first pole, of the active material coating portion, the support is provided with an avoidance hole used for avoiding the conductive portion, and the conductive portion is suitable for extending to one side, far away from the active material coating portion, of the support through the avoidance hole.

In some embodiments, the bracket is provided with a guide portion surrounding at least a portion forming the relief hole, the guide portion extending at least partially into the receiving portion.

In the technical scheme, the support is provided with the guide part at least partially extending into the accommodating part, and at least part of the avoidance hole is formed by surrounding the guide part, so that at least part of the conductive part can be easily accommodated in the accommodating part, and the assembly efficiency of the conductive part is improved; simultaneously, through the setting of guide part for between support and the utmost point post, the cooperation between support and the conductive part is all inseparabler and reliable, makes the free structure of battery with compact, more does benefit to the promotion of the free energy density of battery.

In some embodiments, the edge of the bracket facing away from the cover has a cover-entering guide surface, which includes an arcuate surface and/or an inclined surface. In the technical scheme, the shell-entering guide surface can play a guide role, so that the support can be smoothly arranged in the shell, and the support firstly enters the shell and the active substance coating part and then enters the shell, thereby reducing the problem that the shell scratches the active substance coating part.

In some embodiments, the bracket is a unitary structure; or, the support is split type structure and includes detachable first support and second support, and the hole is dodged in the definition between first support and the second support.

In the above technical scheme, when the support is integrated into a whole structure, the support is convenient to process, the reliability of the support is better, and the support and the shell assembly are convenient to assemble, so that the assembly efficiency and the cooperation stability are improved. When the support is split type structure, dodge the hole through the cooperation of first support and second support, when support and electric core subassembly assembly, need not to wear the other end from dodging the one end in hole with electrically conductive portion, but can splice first support and second support in the position of electrically conductive portion and clip electrically conductive portion for dodge the hole and encircle electrically conductive portion, thereby be convenient for support and electric core subassembly's assembly, improve assembly efficiency.

In some embodiments, the battery cell further comprises: and the inner insulating part is positioned in the shell and wrapped outside the active substance coating part, and is connected with the bracket.

In the technical scheme, on one hand, the inner insulating part is wrapped outside the active material coating part, so that the insulation reliability between the active material coating part and the shell can be improved, the corrosion of the shell caused by the contact of the active material coating part and the shell is reduced or prevented, the leakage problem of electrolyte caused by the corrosion of the shell is reduced, and the reliability of the battery cell is improved; on the other hand, the inner insulating part is connected with the bracket, so that the fixing difficulty of the inner insulating part can be reduced, and the reliability of the inner insulating part wrapping the outside of the active substance coating part can be improved.

In some embodiments, the housing assembly includes at least one first pole riveted to the housing body.

In the above technical scheme, because the first pole is connected with the shell body in a riveting way, when the shell body is thinned, the shell body is not easy to weld, and the first pole is easier to rivet on the shell body, namely, the first pole and the shell body are connected and installed in a riveting way, the operation is convenient, and the shell body is favorable for thinning design and light weight of the shell body through the riveting of the first pole, so that the weight of the battery is reduced. Under the condition that the size of the battery monomer is fixed, the first polar post is convenient to thin the shell body in a riveting mode, so that the internal space of the shell body is increased, and the energy density of the battery monomer is improved.

In some embodiments, the shell is provided with a mounting hole, the first pole comprises an integrally formed pole body, a first limiting table and a second limiting table, the pole body penetrates through the mounting hole, the first limiting table and the second limiting table are arranged at two ends of the pole body along the axial direction of the mounting hole, the first limiting table is in limiting fit with the outer side of the shell, and the second limiting table is in limiting fit with the inner side of the shell, so that the first pole is riveted to the shell.

In the technical scheme, the first limit table and the second limit table extend to the radial outer side of the peripheral wall of the mounting hole along the radial direction of the mounting hole respectively, the first limit table can limit the movement of the first pole relative to the shell in the direction facing the inner side of the shell, the second limit table can limit the movement of the first pole relative to the shell in the direction facing the outer side of the shell, so that the first pole is convenient to be reliably mounted at the mounting hole through the first limit table and the second limit table, riveting of the first pole and the shell is facilitated, assembly of the first pole and the shell is facilitated, reliable connection of the first pole and the shell can be facilitated without adopting other connection modes, the structure of a shell assembly is facilitated, and the assembly procedure of the shell assembly is simplified; meanwhile, the pole body of the first pole, the first limit table and the second limit table are integrally formed, so that parts and cost can be saved, the strength of the first pole can be guaranteed, the first pole and the shell are not easy to separate from the shell due to vibration or external pulling in the charging and discharging process of the battery cell after being matched, and the first pole and the shell are not easy to crack or damage due to vibration or external pulling, and the stability and reliability of the battery cell can be improved.

In some embodiments, the dimension of the first pole in the first direction is greater than the dimension of the first pole in the second direction, the first direction and the second direction being perpendicular, each being perpendicular to the axial direction of the mounting hole.

In the above technical scheme, on the plane formed by the first direction and the second direction, the orthographic projection shape of the first polar column can be non-circular, which is favorable for enabling the first polar column to be well matched with the wall provided with the first polar column on the shell body in the first direction and the second direction, improving the cross section area of the first polar column which can be arranged by the wall of the shell body to a certain extent, being favorable for increasing the overcurrent area of the first polar column in the limited arrangement area on the wall, improving the overcurrent capacity of the first polar column and the heat diffusion capacity of the first polar column, and further being favorable for improving the charging speed of the battery cell adopting the shell assembly.

In some embodiments, the housing has oppositely disposed second and third wall portions, each of which is provided with at least one first pole.

In the above technical scheme, the first polar post can be established on two opposite sides of shell, and when the relative both sides surface of shell was equipped with first polar post respectively, the position that active material coating portion is close to the first polar post of every side all can stretch out conductive part, and conductive part is connected with the cooperation of the first polar post of adjacent side to can improve the tab and be pulled by the first polar post of homonymy, lead to tab and active material coating portion to connect the problem of fracture, thereby improve battery monomer's reliability. It should be noted that the first poles on both sides may be identical or different, and the connection manner between the first poles on both sides and the conductive portion may be identical or different, which is not limited herein.

In some embodiments, the housing has a plurality of walls, a portion of the plurality of walls being a first set wall, an area of the first set wall being greater than an area of the remaining walls, and the first pole being disposed on the first set wall.

In the above technical scheme, that is to say, the first pole is riveted on the biggest wall portion of the shell, because the wall area that is connected with the first pole is biggest, therefore the operation is easier when first pole is riveted, can improve assembly efficiency, promotes the free rate of battery.

In some embodiments, the casing has a plurality of walls, at least one of the plurality of walls is a second set wall, the battery cell further includes a pressure relief portion, the pressure relief portion is disposed on the second set wall, and the first post is disposed on the remaining walls except the second set wall.

In the technical scheme, the first pole and the pressure relief part are arranged on different wall parts, after the battery monomer is out of control, the discharged high-temperature medium is discharged through the pressure relief part and then is not contacted with the first pole, so that the probability of fire caused by contact of a circuit in the battery with the high-temperature medium can be reduced.

In some embodiments, the battery cell further includes a pressure relief portion, the pressure relief portion is disposed on the housing cover, and the pressure relief portion and the housing cover are integrally formed.

In the scheme, the number of integral parts of the battery monomer can be reduced through the integral forming of the pressure relief part and the shell cover, so that the welding step between the pressure relief part and the shell body is reduced, namely, the step of connecting the pressure relief part is not carried out after or before the shell cover is connected with the shell body, thus the assembly efficiency of the battery monomer can be improved, the welding process cost is reduced, the possibility of failure of the welding position is reduced, and the reliability of the battery monomer is improved.

In some embodiments, the housing has a plurality of walls, at least one of the plurality of walls being a first wall, the first pole being riveted to the first wall, the first wall having a thickness greater than a thickness of the remaining walls.

In the above technical scheme, the first wall portion is used as the shell wall connected with the first pole, and the thickness of the first wall portion is larger than that of the other wall portions, so that on one hand, the overall strength of the shell body can be improved due to the fact that the thickness of the first wall portion is larger, and further the reliability of the battery cell in the daily use process is improved. On the other hand, the thickness of the first wall part is relatively large, so that the reliability of the first pole during riveting can be improved, and the rate of the battery cells can be improved. Secondly, under the prerequisite that satisfies first utmost point post riveting reliability, the thickness of first wall portion can be normal wall thickness, and the wall thickness of other wall portions reduces, just so can increase the inside space of shell body under the fixed circumstances of shell body outline size, and then can place the active material coating portion of bigger size, is favorable to promoting the free energy density of battery.

In some embodiments, the thickness of the cover is less than the thickness of the first wall portion.

In the above technical scheme, since the first pole is riveted on the first wall portion, and the shell cover is not connected with the first pole, the strength requirement of the shell cover is relatively low, and the thickness of the shell cover can be smaller than that of the first wall portion, so that materials can be saved, and under the condition that the outer outline size of the shell is fixed, the space in the shell can be increased due to the fact that the thickness of the shell cover is relatively small, and at the moment, the shell can be provided with an active material coating portion with a larger size, and the energy density of a battery cell can be improved.

In some embodiments, the thickness of the cover is greater than the thickness of the remaining wall portions other than the first wall portion and adjacent to the cover.

In the above technical scheme, considering that the shell cover is to be sealed on the opening, the proper strength is required to be provided, therefore, the thickness of the shell cover is set to be larger than the thickness of the rest wall parts except the first wall part and adjacent to the shell cover, so that after the shell cover is sealed on the opening, the overall strength of the shell is relatively good, the probability of damage of the shell can be reduced, and the reliability of the battery cell is improved.

In some embodiments, the opening is provided in the bottom of the housing.

In the above technical solution, since the opening of the shell is disposed at the top in the related art, the cover is mounted on the opening of the top of the shell, and the bottom of the inner space of the shell with such a structure is left with a processing chamfer when the shell is processed, when the active material coating portion is mounted in the shell, the bottom of the active material coating portion (which may refer to the end of the active material coating portion far away from the conductive portion) is not contacted with the processing chamfer of the inner portion of the shell due to the existence of the processing chamfer, and a certain space is left between the active material coating portion and the processing chamfer, and a partition board is disposed in the space to separate the active material coating portion and the cover, thereby causing space waste in the shell. It can be understood that, in the present application, since the opening is provided at the bottom of the case body and the first post is riveted to the case body, in this case structure, there is no machined chamfer between the bottom of the active material coating portion and the case cover after the active material coating portion is put into the case, that is, a spacer can be omitted between the bottom of the active material coating portion and the case cover, and the gap between the bottom of the active material coating portion and the case cover can be greatly reduced, which is advantageous for increasing the size of the active material coating portion and improving the energy density of the battery cell, and on the other hand, since there is no machined chamfer near the bottom of the active material coating portion, the probability of damage due to accidental contact between the active material coating portion and the machined chamfer can be greatly reduced, and further, the performance of the battery cell can be improved, and at the same time, the occurrence of stress concentration at the corner of the active material coating portion can be reduced.

On the other hand, because the cap sets up in the bottom of shell body, when the battery monomer when constituteing the battery the bottom of the box of casing generally need be fixed in the bottom of battery, in this case, when the vibration appears in the use, because the bottom of box is connected to the cap, the amplitude ratio that consequently receives of junction of cap and shell body reduces, can further reduce the probability that cap and shell body take place to split.

In some embodiments, the active material coating portion has a first end surface proximate to the housing cover, the battery cell further includes an inner insulator surrounding the cell assembly, at least a portion of the inner insulator disposed between the first end surface and the housing cover, the inner insulator having opposing first and second surfaces, the first surface in contact with the first end surface and the second surface in contact with the housing cover.

In the above technical solution, the first surface of the inner insulating member contacts the first end surface, and the second surface contacts the cover, that is, the application can omit the support plate between the active material coating portion and the cover in the related art under the condition of satisfying the insulation between the active material coating portion and the cover, thereby being beneficial to saving the space in the cover body, increasing the size of the active material coating portion, and further improving the energy density of the battery cell.

In some embodiments, the housing has a first wall opposite the housing cover, and the first pole is disposed on the first wall.

In the technical scheme, the electric core component enters along the opening, and the conductive part is directly opposite to the first pole, so that the conductive part can be easily connected with the first pole, and the assembly efficiency of the battery cell is improved.

In a second aspect, an embodiment of the present application further provides a battery, including the above battery cell.

In the above technical solution, in the battery, because the first poles of any adjacent battery cells are connected with each other, when the battery vibrates or deforms, the first poles between any adjacent battery cells will pull each other, and at this time, because the first poles are disposed on the housing, the acting force received by the first poles will be preferentially transferred to the housing, and will not directly act on the housing cover; on the one hand, the distance from the acting force to the connection position of the shell body and the shell cover can be prolonged, on the other hand, the shell body can be deformed preferentially when stressed, so that the stress of the connection position of the shell body and the shell cover is reduced, the probability of cracking between the shell cover and the shell body in the use process of the battery is effectively reduced, and the reliability of the battery is improved.

In a third aspect, an embodiment of the present application further provides an electrical apparatus, including the above battery cell or the battery.

In the technical scheme, the battery or the battery monomer is adopted in the power utilization device, the probability of cracking between the shell cover and the shell body of the battery monomer in the use process is relatively low, the reliability of the battery is improved, and the performance of the power utilization device is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic illustration of a vehicle according to some embodiments of the present application;

fig. 2 is an exploded view of a battery according to some embodiments of the present application;

fig. 3 is a schematic structural diagram of a battery cell according to some embodiments of the present application;

FIG. 4 is a cross-sectional view of the internal structure of FIG. 3 taken along the direction A-A;

FIG. 5 is an enlarged schematic view of a portion of the portion I of FIG. 4;

Fig. 6 is a schematic structural diagram of a battery cell according to some embodiments of the present application;

fig. 7 is a front view of a battery cell according to some embodiments of the present application;

FIG. 8 is a cross-sectional view taken along line A-A of FIG. 7;

fig. 9 is a schematic structural diagram of a battery cell according to some embodiments of the present application;

fig. 10 is an assembly diagram of a second post, a cell assembly, and a housing according to some embodiments of the present application;

FIG. 11 is a schematic view, partially in section, of a battery cell provided in some embodiments of the application;

FIG. 12 is a schematic view, partially in section, of a battery cell provided in some embodiments of the application;

FIG. 13 is a schematic view, partially in section, of a battery cell provided in some embodiments of the application;

fig. 14 is a schematic partial cross-sectional view of a cell assembly provided in some embodiments of the application;

fig. 15 is a diagram illustrating various tab gathering schemes of a battery cell assembly according to some embodiments of the present application;

FIG. 16 is a schematic view, partially in section, of a battery cell provided in some embodiments of the application;

FIG. 17 is a schematic view, partially in section, of a battery cell provided in some embodiments of the application;

FIG. 18 is a schematic view, partially in section, of a battery cell provided in some embodiments of the application;

FIG. 19 is a schematic view, partially in section, of a battery cell provided in accordance with some embodiments of the application;

FIG. 20 is a schematic partial cross-sectional view of a battery cell according to some embodiments of the present application;

FIG. 21 is a partial enlarged view at B of FIG. 6;

FIG. 22 is an orthographic view of a plurality of first posts provided in some embodiments of the application;

FIG. 23 is a schematic partial cross-sectional view of a battery cell according to some embodiments of the present application;

FIG. 24 is a schematic partial cross-sectional view of a battery cell according to some embodiments of the present application;

fig. 25 is a schematic partial cross-sectional view of a battery cell provided in some embodiments of the application;

fig. 26 is a structural exploded view of a battery cell according to some embodiments of the present application;

FIG. 27 is a schematic view, partially in section, of a housing assembly provided in accordance with some embodiments of the application;

FIG. 28 is an exploded view of the housing assembly of FIG. 27;

FIG. 29 is an exploded view of the first cover plate of FIG. 28;

FIG. 30 is a schematic view, partially in section, of a battery cell provided in some embodiments of the application;

fig. 31 is a structural exploded view of the battery cell shown in fig. 30;

FIG. 32 is a schematic view, partially in section, of a battery cell provided in some embodiments of the application;

FIG. 33 is a schematic view, partially in section, of a battery cell provided in some embodiments of the application;

FIG. 34 is a schematic partial cross-sectional view of a battery cell according to some embodiments of the present application;

FIG. 35 is a schematic view, partially in section, of a battery cell provided in some embodiments of the application;

FIG. 36 is a schematic view, partially in section, of a battery cell provided in some embodiments of the application;

fig. 37 is a schematic view illustrating the cooperation between a battery cell assembly and a bracket according to some embodiments of the present application;

FIG. 38 is a cross-sectional view taken along line C-C in FIG. 37;

FIG. 39 is a schematic view of an integrated bracket according to some embodiments of the present application;

FIG. 40 is a schematic view of a split bracket according to some embodiments of the present application;

FIG. 41 is a schematic view, partially in section, of a cell assembly and a cradle provided in some embodiments of the application;

fig. 42 is an exploded view of a cell assembly and a bracket, housing assembly according to some embodiments of the present application;

FIG. 43 is an exploded view of a first pole, housing, and gasket according to some embodiments of the present application;

FIG. 44 is an assembly view of the first pole and the housing and gasket shown in FIG. 43;

FIG. 45 is a schematic view of a first pole according to some embodiments of the present application;

FIG. 46 is an assembly view of the first pole and the housing and gasket shown in FIG. 45;

FIG. 47 is an exploded view of the structure of the first pole shown in FIG. 45;

FIG. 48 is an orthographic view of a battery cell according to some embodiments of the present application;

FIG. 49 is an orthographic view of a battery cell according to some embodiments of the present application;

FIG. 50 is a cross-sectional view taken along line D-D of FIG. 49;

FIG. 51 is a schematic cross-sectional view of a housing assembly provided in some embodiments of the application;

FIG. 52 is a schematic cross-sectional view of a housing assembly provided in some embodiments of the application;

FIG. 53 is an orthographic view of a battery cell according to some embodiments of the present application;

FIG. 54 is a cross-sectional view taken along line E-E of FIG. 53;

FIG. 55 is a schematic view, partially in section, of a battery cell provided in some embodiments of the application;

FIG. 56 is a schematic view of a structure of a cover according to some embodiments of the present application;

fig. 57 is a schematic diagram of a second structure of a battery cell according to some embodiments of the application;

fig. 58 is a schematic diagram III of a battery cell according to some embodiments of the present application;

FIG. 59 is an enlarged schematic view of a portion of FIG. 4 at II;

fig. 60 is a top view of a battery cell according to some embodiments of the present application.

Icon:

an electric device 1000; a battery 100; a controller 200; a motor 300;

a first direction Z; a second direction X; a third direction Y;

an axial direction R of the first pole;

a battery cell 10; a case 20; a first casing 201; a second housing 202;

a housing assembly 1;

A housing 11; a first wall 110; a housing 111; an opening 111a; a wall section 1111; a first wall portion 1112; a second wall 1113; a third wall 1114; wall 1115; a first setting wall 1116; a cover 112; a reservoir 112a; a first groove 1121; a second groove 1122; a third groove 1123; a boss 112b; a mounting hole 113;

a first pole 12;

a housing portion 121;

a first receiving groove 12110; a first end wall 12111; first sink 12112; a first sidewall 12113;

a second receiving groove 12120; a second end wall 12121; a second sink 12122; a second sidewall 12123;

a first slot segment 12124; a second slot segment 12125; guide ramp 12126; step surface 12127;

a first perforation 12130; a third receiving groove 12140; fourth receiving groove 12150;

a second perforation 12160; a third perforation 12170; a post inner end surface 122; a post outer end face 123;

a first pole portion 124; a second pillar portion 125;

a first groove 126; a spacer 127;

a stop 1281; a penetrating portion 1282; a burring 1283;

a first portion 1291; a second portion 1292;

a first cover plate 13; a first conductive member 131; a second groove 1311; a second conductive member 132; stress relief grooves 133;

a second cover plate 14; a second pole 15; a pressure release section 16; a relief groove 18;

A first gasket 191; a second gasket 192;

a cell assembly 2; an electrode assembly 2a;

an active material coating portion 21; a first end face 21a; current collector 211; an active material layer 212; a conductive portion 22;

a tab portion 221; tab 2211; a first gathering portion 2212; a second gathering portion 2213; a switching piece 222;

a bracket 3; a relief hole 31; a first bore section 311; a second bore section 312;

a guide portion 32; a first bracket 33; a second bracket 34; a shell-entering guide surface 35;

a body portion 36; an extension 37; a third groove 38; a positioning groove 39;

an inner insulator 4; a main body 41; a connection portion 42; a first surface 4a; a second surface 4b;

a seal 6; a slot cover 7.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description of the application and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion. The terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

The term "and/or" in the present application is merely an association relation describing the association object, and indicates that three kinds of relations may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In the present application, the character "/" generally indicates that the front and rear related objects are an or relationship.

In the embodiments of the present application, the same reference numerals denote the same components, and detailed descriptions of the same components are omitted in different embodiments for the sake of brevity. It should be understood that the thickness, length, width, etc. dimensions of the various components in the embodiments of the application shown in the drawings, as well as the overall thickness, length, width, etc. dimensions of the integrated device, are merely illustrative and should not be construed as limiting the application in any way.

The term "plurality" as used herein refers to two or more (including two).

In the present application, the battery cell may include a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like, which is not limited in the embodiment of the present application. The battery cell may be in a cylindrical shape, a flat shape, a rectangular parallelepiped shape, or other shapes, which is not limited in this embodiment of the application. The battery cells are generally classified into three types according to the packaging method: the cylindrical battery cell, the square battery cell and the soft package battery cell are not limited in this embodiment.

Reference to a battery in accordance with an embodiment of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in the present application may be a battery module, a battery pack, or the like. When the battery is a battery module, the battery module is composed of a plurality of battery cells. When the battery is a battery pack, the battery pack can be directly formed by a box body and a plurality of battery monomers arranged in the box body; the battery module can be formed by firstly forming the battery unit and then forming the battery module in the box body. The case body can prevent liquid or other foreign matters from affecting the charge or discharge of the battery cells.

For example, a battery cell may generally include a housing for receiving the electrode assembly and the electrolyte, the housing having at least one positive electrode tab and at least one negative electrode tab disposed thereon. The electrode assembly consists of a positive electrode plate, a negative electrode plate and a separation film. The material of the separator is not limited, and may be, for example, polypropylene or polyethylene.

The positive electrode sheet may generally include a positive electrode current collector and a positive electrode active material layer directly or indirectly coated on the positive electrode current collector, the positive electrode current collector without the positive electrode active material layer protruding from the positive electrode current collector coated with the positive electrode active material layer, the positive electrode current collector without the positive electrode active material layer serving as a positive electrode tab.

The negative electrode tab may generally include a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer being directly or indirectly coated on the negative electrode current collector, the negative electrode current collector without the negative electrode active material layer protruding from the negative electrode current collector with the coated negative electrode active material layer, the negative electrode current collector without the negative electrode active material layer serving as a negative electrode tab.

The electrode assembly may be a wound structure or a laminated structure, and the positive electrode sheet, the negative electrode sheet, and the separator are wound or laminated in this order during processing to obtain the electrode assembly. In the electrode assembly, a plurality of positive electrode tabs are stacked together and electrically connected to the positive electrode column, and a plurality of negative electrode tabs are stacked together and electrically connected to the negative electrode column.

The battery cell mainly relies on metal ions to move between the positive pole piece and the negative pole piece to work. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, the material of the positive electrode active material layer may be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate, etc., the material of the negative electrode current collector may be copper, the material of the negative electrode active material layer may be carbon or silicon, etc. Li+ is inserted and extracted back and forth between the two electrodes during charge and discharge: during charging, li+ is deintercalated from the positive electrode, and is inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true when discharging.

In recent years, new energy automobiles have been developed dramatically, and in the field of electric automobiles, batteries play an important role as a power source of the electric automobiles. The battery is used as a core part of a new energy automobile, and has high requirements in terms of energy density and reliability.

In the related art battery cell, at the time of manufacturing, an active material layer is coated on a current collector and then cut to obtain a tab composed of the current collector coated with the active material layer (denoted as an active material coated portion) and the current collector not coated with the active material layer (denoted as a tab), and then a positive and negative tab and a separator are sequentially laminated or wound to obtain a battery cell assembly in which a plurality of tabs are laminated to form a tab. The lug part is connected with the adapter piece to form a conductive part, or the lug part forms a conductive part; the active material coating portion and the conductive portion form a cell assembly. The casing of the battery cell is provided with a pole, and the conductive part is welded on the pole when the battery cell is manufactured, so that the normal operation of charge and discharge operation is ensured.

However, the inventors found that in the related art the top of the case has an opening, the pole is provided on the case cover, and the case cover is covered on the opening and welded with the case, wherein the weld is at the very top of the battery cell. However, when the battery is assembled, the bottom of the shell needs to be fixed, and the adjacent battery posts are connected through conductive parts (such as bus bars), and as the posts are arranged on the shell cover, when the battery vibrates or deforms in the use process, the conductive parts can pull the posts, the pulling force of the conductive parts on the posts is easily conducted to the welding seam of the shell cover and the shell, so that the welding seam of the shell cover and the shell is easily subjected to material fatigue to cause cracking, and the reliability of the battery is affected.

Based on the above-mentioned considerations, in order to improve the reliability of the battery cell, the inventors have studied and found that by changing the mounting position of the pole and riveting the pole to the housing, it is possible to make the housing cover in the battery cell not directly connected to the pole, so that when the battery cells are pulled from each other due to vibration or deformation during use of the constituent battery, the force applied to the first pole is preferentially transmitted to the housing, but not directly applied to the housing cover, because the first pole is disposed on the housing; on one hand, the distance between the acting force and the welding seam of the shell body and the shell cover can be prolonged, on the other hand, the shell body can be deformed preferentially when stressed, so that the stress of the welding seam of the shell body and the shell cover is reduced, the probability of cracking of the welding seam of the shell body and the shell cover in the use process of the battery is effectively reduced, and the reliability of the battery is improved.

The embodiment of the application provides an electricity utilization device using a battery monomer as a power supply, wherein the electricity utilization device can be, but is not limited to, a mobile phone, a flat plate, a notebook computer, an electric toy, an electric tool, a battery car, an electric automobile, a ship, a spacecraft and the like. Among them, the electric toy may include fixed or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric plane toys, and the like, and the spacecraft may include planes, rockets, space planes, and spacecraft, and the like.

For convenience of description, the following embodiments will take an electric device according to an embodiment of the present application as an example of a vehicle. Referring to fig. 1, fig. 1 is a schematic structural diagram of an electric device 1000 according to some embodiments of the application. The vehicle can be a fuel oil vehicle, a fuel gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle and the like. The battery 100 is provided in the interior of the vehicle, and the battery 100 may be provided at the bottom or the head or the tail of the vehicle. The battery 100 may be used for power supply of a vehicle, for example, the battery 100 may be used as an operating power source of the vehicle. The vehicle may also include a controller 200 and a motor 300, the controller 200 being configured to control the battery 100 to power the motor 300, for example, for operating power requirements during start-up, navigation, and travel of the vehicle. In some embodiments of the present application, battery 100 may be used not only as an operating power source for a vehicle, but also as a driving power source for a vehicle to provide driving power for the vehicle instead of or in part instead of fuel oil or natural gas.

Referring to fig. 2, fig. 2 is an exploded view of a battery cell 10 for a battery 100 according to some embodiments of the present application. The battery 100 includes a case 20 and a plurality of battery cells 10, and the battery cells 10 are accommodated in the case 20. The case 20 is used to provide an assembly space for the battery cell 10, and the case 20 may have various structures. In some embodiments, the case 20 may include a first case 201 and a second case 202, the first case 201 and the second case 202 being covered with each other, the first case 201 and the second case 202 together defining an assembly space for accommodating the battery cell 10. The second case 202 may have a hollow structure with one end opened, the first case 201 may have a plate-shaped structure, and the first case 201 covers the open side of the second case 202, so that the first case 201 and the second case 202 together define an assembly space; the first case 201 and the second case 202 may be hollow structures with one side open, and the open side of the first case 201 may be closed to the open side of the second case 202. Of course, the case 20 formed by the first case 201 and the second case 202 may be various shapes, such as a cylinder, a rectangular parallelepiped, etc.

In the battery 100, the plurality of battery cells 10 may be connected in series or parallel or a series-parallel connection, wherein a series-parallel connection refers to that the plurality of battery cells 10 are connected in series or parallel. The plurality of battery cells 10 can be directly connected in series or in parallel or in series-parallel, and then the whole formed by the plurality of battery cells 10 is accommodated in the box body 20; of course, the battery 100 may also be a battery module formed by connecting a plurality of battery cells 10 in series or parallel or series-parallel connection, and a plurality of battery modules are then connected in series or parallel or series-parallel connection to form a whole and are accommodated in the case 20. The battery 100 may further include other structures, for example, the battery 100 may further include a bus bar for making electrical connection between the plurality of battery cells 10.

Referring to fig. 3, fig. 3 is a schematic diagram of a battery cell 10 according to some embodiments of the application. The battery cell 10 is rectangular, the height direction of the battery cell 10 is a first direction Z, the thickness direction of the battery cell 10 is a second direction X, and the length direction of the battery cell is a third direction Y. The first direction Z, the second direction X and the third direction Y are perpendicular to each other. But is not limited thereto, in other embodiments of the present application, the battery cell 10 may also have a cylindrical shape, a flat shape, or other shapes, etc.

As shown in fig. 3 to 6, the battery cell 10 includes a case assembly 1 and a cell assembly 2.

The housing assembly 1 includes a housing 11 and a first pole 12, the housing 11 includes a housing body 111 and a housing cover 112, the housing body 111 has an opening 111a, the housing cover 112 covers the opening 111a, and the housing body 111 is provided with the first pole 12. The battery cell assembly 2 includes an active material coating portion 21 and a conductive portion 22, the active material coating portion 21 being housed in the case body 111, the conductive portion 22 electrically connecting the active material coating portion 21 and the first terminal 12.

The shell 11 is provided with a pole column which is used for being electrically connected with the battery cell assembly 2 so as to ensure that the battery cell 10 can be charged and discharged normally. The number of the poles is at least two, specifically at least one positive pole and at least one negative pole, for example, when the number of the poles is two, one is the positive pole and the other is the negative pole, and the two are respectively electrically connected with the positive output position and the negative output position of the electric core component 2; for example, when the number of the electrode posts is four, two may be positive electrode posts and two may be negative electrode posts. At least one of the plurality of poles is a first pole 12, and the first pole 12 may be used as either a positive pole or a negative pole.

In the embodiment of the present application, the battery cell assembly 2 includes the active material coating portion 21 and the conductive portion 22, the active material coating portion 21 is accommodated in the case 11, the active material coating portion 21 is a portion of the battery cell assembly 2 coated with the active material, the metal ions can be assisted in the deintercalation during the charge and discharge of the battery cell 10, the conductive portion 22 is a metal structure electrically connecting the active material coating portion 21 and the electrode post, which is not coated with the active material, and the conductive portion 22 can be electrically connected with the active material coating portion 21 to enable the charge and discharge operation of the battery cell 10.

The active material coating portion 21 is divided into a positive electrode active material coating portion including a portion of the positive electrode current collector coated with the positive electrode active material layer and a negative electrode active material coating portion including a portion of the negative electrode current collector coated with the negative electrode active material layer. The conductive portion 22 is divided into a positive electrode conductive portion and a negative electrode conductive portion, the positive electrode conductive portion electrically connects the positive electrode active material coating portion and the positive electrode post, and the negative electrode conductive portion electrically connects the negative electrode active material coating portion and the negative electrode post.

In the above-mentioned technical solution, in the battery 100, since the first poles 12 of any adjacent battery cells 10 are connected to each other, when the battery 100 vibrates or deforms, the first poles 12 between any adjacent battery cells 10 will pull each other, and at this time, since the first poles 12 are disposed on the housing 111, the force applied to the first poles 12 will be preferentially transmitted to the housing 111, and will not directly act on the housing cover 112; on one hand, the distance between the acting force and the welding seam between the shell 111 and the shell cover 112 can be prolonged, on the other hand, the shell 111 can be deformed preferentially when stressed, so that the stress of the welding seam between the shell 111 and the shell cover 112 is reduced, the probability of cracking of the welding seam between the shell cover 112 and the shell 111 in the use process of the battery is effectively reduced, and the reliability of the battery cell 10 is improved.

In the embodiment of the present application, referring to fig. 7 and 8, the first pole 12 is provided with the receiving portion 121, and at least part of the conductive portion 22 is received in the receiving portion 121.

Referring to the foregoing, the number of the poles may be plural, at least one of the poles may be the first pole 12, the first pole 12 may be a pole formed with the accommodating portion 121, the accommodating portion 121 may be a virtual body structure having an accommodating space, and may be a groove-shaped structure, a hole-shaped structure, or a composite structure of a groove-shaped structure and a hole-shaped structure. That is, all the poles on the case 11 may be the first pole 12 having the receiving portion 121 formed therein, or a part of the poles on the case 11 may be the first pole 12 having the receiving portion 121 formed therein, and when a part of the poles on the case 11 are the first poles 12 having the receiving portion 121 formed therein, the remaining poles on the case 11 may be the second poles 15 having no receiving portion 121 (see fig. 9 and 10). At least a part of the conductive portion 22 may be entirely accommodated in the accommodating portion 121, or a part of the conductive portion 22 may be accommodated in the accommodating portion 121. Since the first pole 12 is provided with the receiving portion 121, the hollow structure of the receiving portion 121 can reduce the weight of the pole 12 to some extent, so that the weight energy density of the battery cell 10 and the battery 100 can be improved.

And, the part or the whole of the conductive part 22 is accommodated in the accommodating part 121, so that the part of the conductive part 22 in the accommodating part 121 can occupy the space in the first pole 12, thereby reducing the occupied space of the conductive part 22 in the housing 11, saving some space in the housing 11 when the size of the housing 11 is fixed, accommodating the larger-sized active material coating part 21, and improving the volumetric energy density of the battery cell 10. For example, when the conductive part 22 is drawn out from the side of the active material coating part 21 near the first electrode post 12, the space occupation of the conductive part 22 between the active material coating part 21 and the first electrode post 12 can be saved, so that the size of the active material coating part 21 in the drawing direction of the conductive part 22 can be increased, the interval between the active material coating part 21 and the first electrode post 12 can be reduced, and the energy density of the battery cell 10 can be improved.

In addition, by accommodating at least part of the conductive part 22 in the accommodating part 121, the space occupied by the battery cell 10 itself can be reduced, so that the battery 100 of the same volume can accommodate a greater number of battery cells 10, thereby also improving the volumetric energy density of the battery 100; in addition, at least part of the conductive part 22 is accommodated in the accommodating part 121 to occupy the space in the first pole 12, so that the redundancy of the conductive part 22 in the shell 11 can be reduced to at least a certain extent, the probability of short circuit between the conductive part 22 and the active material coating part 21 is reduced, the probability of short circuit of the battery cell 10 is reduced, and the working reliability and stability of the battery cell 10 and the battery 100 are improved; at least a portion of the conductive portion 22 is received in the receiving portion 121 of the first pole 12 to facilitate connection of the conductive portion 22 to the first pole 12.

In some alternative embodiments of the present application, referring to fig. 6-8, each of the plurality of poles on the housing assembly 1 is a first pole 12 having a receiving portion 121, such that more conductive portions 22 may be received within all of the first poles 12 to better enhance the volumetric energy density of the battery cell 10.

In other alternative embodiments of the present application, referring to fig. 9 and 10, at least one of the plurality of poles on the housing assembly 1 is the first pole 12 having the receiving portion 121 and at least one of the plurality of poles is the second pole 15 having no receiving portion 121, so that the first pole 12 and the second pole 15 can be flexibly selected and matched according to the actual requirements of energy density, cost, etc., to improve the applicability of the battery cell 10.

In some alternative embodiments, referring to fig. 9 and 10, a relief groove 18 is defined between the second pole 15 and the housing 11, and at least a portion of the conductive portion 22 is received in the relief groove 18. This can reduce the space occupation of the conductive part 22 in the housing 11 to some extent, thereby improving the energy density and improving the problems such as shorting due to redundancy of the conductive part 22.

For simplicity of description, the following description will mainly take the case that all the poles on the housing 11 are the first pole 12 formed with the receiving portion 121 as an example. Furthermore, the housing assembly 1 according to some embodiments of the present application may be provided with only one pole, and the first pole 12, the first pole 12 including two insulated portions as a positive pole and a negative pole, respectively.

In the embodiment of the present application, the receiving portion 121 may be located on the side of the first electrode post 12 facing the active material coating portion 21 or on the side of the first electrode post 12 facing away from the active material coating portion 21. As an example, when the housing 121 is located on the side of the first electrode post 12 facing the active material coating portion 21 with reference to fig. 11 and 12, the housing 121 has a first housing groove 12110, the surface of the first electrode post 12 on the side facing the active material coating portion 21 is a post inner end surface 122, a notch of the first housing groove 12110 is formed on the post inner end surface 122, and at least part of the conductive portion 22 is housed in the first housing groove 12110.

Illustratively, the first receiving groove 12110 may be a groove body having a groove-like structure with a certain depth. For example, when the first pole 12 is provided at the upper end wall of the housing 11, the pole inner end surface 122 is the lower surface of the first pole 12, the first accommodation groove 12110 is formed as an accommodation groove in which a notch is opened downward and a groove wall is recessed upward. For another example, when the first pole 12 is provided at the lower end wall of the housing 11 and the pole inner end surface 122 is the upper surface of the first pole 12, the first receiving groove 12110 is formed as a receiving groove in which a notch is opened upward and a groove wall is depressed downward.

In the above technical solution, on one hand, the first accommodating groove 12110 is formed on the first pole 12, so that the weight of the first pole 12 can be reduced to a certain extent, so as to improve the weight energy density of the battery cell 10 and the battery 100; on the other hand, since the notch of the first receiving groove 12110 is formed on the pole inner end face 122, and the pole inner end face 122 is the surface of the first pole 12 on the side close to the active material coating portion 21, the first receiving groove 12110 can be opened toward the active material coating portion 21, thereby facilitating the conductive portion 22 to extend into the first receiving groove 12110, and improving the assembly efficiency. Also, the first receiving groove 12110 of this form facilitates the process and improves the production efficiency.

Also, the first accommodation groove 12110 is easily processed to have a larger volume, so that more conductive parts 22 can be accommodated; meanwhile, since the first receiving groove 12110 is opened toward the active material coating portion 21, the first receiving groove 12110 may also serve as a buffer and temporary storage structure of the electrolyte, so that more electrolyte may be received in the case 11, and since the electrolyte may be lost during the charge and discharge of the battery cell 10, the service life of the battery cell 10 may be prolonged when the electrolyte is more; and also because the first receiving groove 12110 is opened toward the active material coating portion 21, the first receiving groove 12110 may also serve as a receiving and buffering structure of the gas generated inside the battery cell assembly 2, reducing the expansion of the battery cell 10, and improving the reliability and stability of the battery cell 10.

In addition, since the first receiving groove 12110 is located at the inner side of the first pole 12, foreign matter impurities outside are not easy to enter the first receiving groove 12110, so that the influence of the foreign matter impurities outside on the battery cell assembly 2 can be reduced, the stability and reliability of the operation of the battery cell assembly 2 can be improved, and the stability and reliability of the battery cell 10 and the battery 100 can be further improved; the first receiving groove 12110 is located at the inner side of the first pole 12, and at least a portion of the conductive portion 22 is received in the first receiving groove 12110, so as to limit the conductive portion 22 from the inner side of the first pole 12, and facilitate connection of the conductive portion 22 with the first pole 12.

Referring to fig. 11, in the embodiment of the present application, the connection manner between the first pole 12 and the housing 11 is not limited, and may be, for example, welding or caulking, for example, when the first pole 12 and the housing 11 are mated by caulking, the housing 11 has a mounting hole 113, and the first pole 12 is mounted in the mounting hole 113 by caulking. Of course, it will be appreciated that the housing 11 may also be provided with mounting holes 113 when the two are welded or otherwise mated, with the first pole 12 being mounted at the mounting holes 113. The mounting hole 113 may be specifically provided on the housing 111.

Alternatively, in conjunction with fig. 11, the first receiving groove 12110 may be disposed corresponding to the position of the mounting hole 113, or, on a projection plane perpendicular to the axial direction R of the first pole 12, the front projection of the first receiving groove 12110 is located within the front projection range of the mounting hole 113, so that the first receiving groove 12110 may have a larger depth to accommodate more conductive parts 22, and thus, the occupied space of the conductive parts 22 in the housing 11 may be reduced to a greater extent.

In some embodiments, referring to fig. 11, when the housing 11 is provided with the mounting hole 113, and the first pole 12 is mounted in the mounting hole 113, the depth H1 of the first receiving groove 12110 is greater than or equal to the minimum distance H2 from the pole inner end surface 122 to the mounting hole 113 along the axial direction R of the first pole 12.

The specific shape of the first receiving groove 12110 is not limited, and may be a regular shape, or may be an irregular shape, such as a rectangular, elliptical, or oblong isosceles cylindrical groove, a rectangular trapezoid groove, a hemispherical groove, or a hemispherical groove, etc. Accordingly, the depth H1 of the first receiving groove 12110 refers to: the maximum depth of the first receiving groove 12110 in the axial direction R of the first pole 12.

Since the depth H1 of the first accommodation groove 12110 is greater than or equal to the minimum distance H2 from the inner end surface 122 of the pole to the mounting hole 113 in the axial direction R of the first pole 12, the volume of the first pole 12 can be fully utilized, so that the first accommodation groove 12110 has a larger depth, which is beneficial to accommodating more conductive parts 22, thereby being capable of reducing the occupied space of the conductive parts 22 in the housing 11 to a greater extent, further improving the energy density of the battery cell 10, and further reducing the redundancy of the conductive parts 22 in the housing 11; meanwhile, since the first receiving groove 12110 has a larger depth, gas generation of the cell assembly 2 can be also received, reliability and stability of the battery cell 10 can be ensured, and more electrolyte can be also received, so that the service life of the battery cell 10 can be ensured.

It should be noted that the volume of the first receiving groove 12110 is not limited, for example, in some specific examples, the volume of the first receiving groove 12110 (denoted as the first volume V1) that may be used to receive the conductive portion 22 may be greater than or equal to 298mm ³ So that the first receiving groove 12110 can have a sufficient space to receive the conductive part 22 and facilitate welding of the conductive part 22 with the first pole 12. And when the first volume V1 of the first accommodation groove 12110 is less than 298mm ³ In this case, the accommodating capacity of the first accommodating groove 12110 with respect to the conductive part 22 is relatively reduced, and the difficulty in welding the conductive part 22 and the first pole 12 is increased.

It should be noted that the first volume V1 of the first accommodation groove 12110 is: the difference between the total volume V2 of the first accommodation groove 12110 and the volume (denoted as a second volume V3) of the first accommodation groove 12110 required to accommodate other components except the conductive portion 22, that is, v1=v2-V3. It will be appreciated that the second volume V3 may be 0mm when the first receiving groove 12110 is not required to receive other components than the conductive portion 22 ³ . For example, the first volume V1 of the first receiving groove 12110 may be 300mm ³ -1500mm ³ For example 300mm ³ 、400mm ³ 、500mm ³ 、600mm ³ 、700mm ³ 、800mm ³ 、1000mm ³ 、1200mm ³ 、1400mm ³ 、1500mm ³ Etc.

In order to secure the stability and reliability of the electrical connection of the active material coated portion 21 and the first pole 12 in combination with fig. 11 and 12, in some embodiments of the present application, the electrical connection position of the conductive portion 22 and the first pole 12 may be located on the groove wall of the first receiving groove 12110. Illustratively, the conductive portion 22 and the first pole 12 may be electrically connected by welding, where the conductive portion 22 and the first pole 12 are welded. Meanwhile, the welding manner of the conductive portion 22 and the first pole 12 is not limited, and may be, for example, laser welding, and vertical welding, oblique welding, overlap welding, edge sealing welding, or the like may be selected according to the position, angle, structure, or the like of the welding portion. In other embodiments of the present application, the conductive portion 22 and the first pole 12 may be electrically connected by other means instead of soldering, such as by providing conductive glue or conductive nails. For simplicity of description, the electrical connection between the conductive portion 22 and the first pole 12 will be described below by taking a soldering position, i.e. an electrical connection position between the conductive portion 22 and the first pole 12 as an example.

Referring to fig. 11 and 12, more specifically, the first pole 12 includes a first end wall 12111 and a first side wall 12113, the first end wall 12111 is located on a side of the first side wall 12113 away from the active material coating portion 21, the first end wall 12111 and the first side wall 12113 enclose a first receiving groove 12110, and an electrical connection position between the conductive portion 22 and the first pole 12 is located on the first end wall 12111 and/or the first side wall 12113. That is, the conductive portion 22 may be welded to at least one of the first end wall 12111 and the first side wall 12113.

In the above-mentioned technical solution, by providing the electrical connection position between the conductive portion 22 and the first pole 12 on at least one of the first end wall 12111 and the first side wall 12113, the first receiving groove 12110 has not only the function of receiving at least part of the conductive portion 22, but also the groove wall of the first receiving groove 12110 has the function of electrically connecting with the conductive portion 22, so that the structure of the first pole 12 can be simplified, the processing of the first pole 12 is facilitated, the structure of the conductive portion 22 can be simplified, the redundancy of the conductive portion 22 can be reduced, and the cost of the conductive portion 22 can be reduced. Moreover, the groove wall of the first accommodating groove 12110 is utilized to realize the electric connection with the conductive part 22, so that the electric connection area between the conductive part 22 and the first pole 12 can be relatively larger, the difficulty of electric connection can be reduced, the reliability and stability of electric connection can be improved, and the performance of the battery cell 10 can be further improved; the electrically connecting position of the conductive portion 22 and the first terminal 12 is located at the first end wall 12111, so that the conductive portion 22 and the first end wall 12111 can be connected from the outside.

In addition, since the electrical connection position of the conductive portion 22 and the first pole 12 is located in the first accommodation groove 12110, it is not only possible to avoid protruding the electrical connection position outside the first pole 12 and occupying the space outside the first pole 12, but also possible to protect the electrical connection position of the first pole 12, and improve the reliability and stability of the electrical connection of the conductive portion 22 and the first pole 12.

In addition, in the embodiment of the present application, the first end wall 12111 is constructed in a closed structure without being perforated to isolate the first receiving groove 12110 from the external space of the case 11, so that the problem of leakage of the electrolyte within the case 11 from the first receiving groove 12110 can be avoided.

In some alternative embodiments, referring to fig. 11 and 12, the partial shape of the conductive portion 22 matches the partial shape of the first end wall 12111 and is positioned and electrically connected snugly such that the location where the conductive portion 22 is electrically connected to the first end wall 12111 extends along the length or width of the first end wall 12111. For example, when first end wall 12111 is planar, portions of conductive portion 22 may be planar and attached to first end wall 12111, and the attached locations may be electrically connected, such as by soldering. Therefore, the area of the electric connection can be increased, and the reliability and stability of the electric connection are improved.

In addition, when the electrical connection of the conductive portion 22 and the first end wall 12111 is soldering, since the first end wall 12111 is located at the side of the first receiving groove 12110 remote from the active material application portion 21, soldering operation is facilitated, for example, soldering can be performed from the side of the first pole 12 remote from the active material application portion 21.

It should be noted that the shape of the first end wall 12111 is not limited, and may be, for example, a flat plate shape, an arc plate shape, or the like. When the first end wall 12111 is a flat plate structure, the first end wall 12111 is disposed at an angle to the axial direction R of the first pole 12, for example, may be a flat plate structure perpendicular to the axial direction R of the first pole 12, or may be an inclined plate structure not perpendicular to the axial direction R of the first pole 12, but the inclination direction is not limited.

Of course, in other embodiments of the present application, the location where the conductive portion 22 is electrically connected to the first end wall 12111 may not extend along the length or the width direction of the first end wall 12111, for example, may be a plurality of points that are discretely disposed, for example, a plurality of portions of the conductive portion 22 disposed at intervals are welded to the first end wall 12111 respectively, which is not described herein.

In some embodiments of the application, referring to fig. 13, when the conductive portion 22 is electrically connected to the first end wall 12111, a first sink groove 12112 may be provided on the first end wall 12111, and a sinking direction of the first sink groove 12112 is a direction away from the active material application portion 21. At least part of the position where the conductive portion 22 is electrically connected to the first end wall 12111 is located within the first sink 12112. Illustratively, at least a portion of the conductive portion 22 may be disposed within the first sink 12112 and connected to the first end wall 12111 at a location for defining the first sink 12112.

In the above technical solution, on one hand, the first sinking groove 12112 may be used to realize the pre-positioning and limiting of the electrical connection position of the conductive part 22, which is not only beneficial to the electrical connection of the alignment position, improves the production efficiency, but also beneficial to the improvement of the stability and reliability of the conductive part 22, and ensures the stability and reliability of the charging and discharging process of the battery cell 10; on the other hand, by providing the first countersink 12112 on the first end wall 12111, the partial wall thickness of the first end wall 12111 can be partially reduced, which is advantageous not only for welding but also for reducing the weight of the first pole 12 and increasing the weight energy density of the battery cell 10.

In some alternative embodiments, portions of the conductive portion 22 are shaped to match and conform to the shape of the first side wall 12113, such as when the first side wall 12113 is curved, portions of the conductive portion 22 may also be curved and conform to the first side wall 12113, and electrical connections (e.g., welding) may be made to the locations of the bonding such that the locations at which the conductive portion 22 is electrically connected to the first side wall 12113 extend along the first side wall 12113. Therefore, the area of the electric connection can be increased, and the reliability and stability of the electric connection are improved.

Of course, the present application is not limited thereto, and in other embodiments of the present application, the position where the conductive portion 22 is electrically connected to the first side wall 12113 may not extend along the first side wall 12113, for example, may be a plurality of points that are discretely disposed, for example, the conductive portion 22 has a plurality of portions that are disposed at intervals and are welded to the first side wall 12113, which is not described herein.

It should be noted that the number of the first side walls 12113 is not limited, and may be determined according to the shape of the first receiving groove 12110, so as to ensure that one end of each first side wall 12113, which is far from the notch of the first receiving groove 12110, is connected to the first end wall 12111. Illustratively, when the cross-sectional shape of the first receiving groove 12110 is circular or elliptical, the first end wall 12111 is circular or elliptical, the number of the first side walls 12113 is one, and is ring-shaped, around the circumferential edge of the first end wall 12111. Further illustratively, when the cross-sectional shape of the first receiving groove 12110 is rectangular or oblong, the first end wall 12111 is rectangular or oblong, and the number of the first side walls 12113 is four, which are respectively connected to the four sides of the first end wall 12111.

It should be further noted that the first receiving groove 12110 is not limited to the form defined by the first end wall 12111 and the first side wall 12113, for example, in some embodiments, the first end wall 12111 may not exist, and then the ends of the slots of each first side wall 12113 away from the first receiving groove 12110 are gathered together, so that the first receiving groove 12110 is defined only by the plurality of first side walls 12113, and then the conductive part 22 may be electrically connected to the first side wall 12113 to ensure that the charge and discharge process of the battery cell 10 is performed normally.

In addition, it should be noted that, in other embodiments of the present application, the electrical connection position between the conductive portion 22 and the first pole 12 may not be located in the first receiving groove 12110. For example, the location of the electrical connection of the conductive portion 22 to the first pole 12 may also be located on the pole inner end face 122.

Referring to fig. 12 and 13, in the embodiment of the present application, the first pole 12 may be further provided with a first groove 126 according to the requirement, the first groove 126 is located on the side of the first pole 12 away from the active material coating portion 21, that is, the surface of the side of the first pole 12 away from the active material coating portion 21 is the pole outer end face 123, and the notch of the first groove 126 is formed on the pole outer end face 123.

It is understood that the first groove 126 is a groove body, and the groove body is a groove-shaped structure with a certain depth. And, when the first pole 12 is provided at the upper end wall of the housing 11, the pole outer end face 123 is the upper surface of the first pole 12, the first groove 126 is formed as a groove in which the notch is opened upward, and the groove wall is depressed downward. For another example, when the first pole 12 is provided at the lower end wall of the housing 11 and the pole outer end face 123 is the lower surface of the first pole 12, the first groove 126 is formed as a groove in which the notch is opened downward and the groove wall is recessed upward.

In the above technical solution, on one hand, since the first pole 12 is provided with the first groove 126, the weight of the first pole 12 can be further reduced, so as to improve the weight energy density of the battery cell 10 and the battery 100; on the other hand, the first groove 126 is located on the outer side of the first pole 12, i.e. is open towards the side of the first pole 12 facing away from the interior of the housing 11, so that the first groove 126 can be used to accommodate or mount structural components of the battery 100 electrically connected to each battery cell 10, so as to fully utilize the space in the first pole 12 and improve the space utilization and volumetric energy density of the battery 100.

In addition, since the first receiving groove 12110 and the first groove 126 are simultaneously formed on the first post 12, the first groove 126 is located at a side of the first receiving groove 12110 away from the active material applying portion 21, and the first groove 126 is opened toward a direction away from the first receiving groove 12110, thereby facilitating laser welding of the conductive portion 22 and the first end wall 12111 through the first groove 126 from an outer side of the first post 12, i.e., a side of the first post 12 away from the active material applying portion 21, i.e., facilitating electrical connection of the conductive portion 22 and the first post 12 through external welding. That is, with the above-described structure, the external welding of the first pole 12 and the conductive part 22 through the first groove 126 can be facilitated, the processing and manufacturing of the battery cell 10 can be facilitated, and the processing and manufacturing costs can be saved.

Further, in order to facilitate and effectively weld the conductive portion 22 with the groove wall of the first accommodation groove 12110 through the first groove 126, to improve the reliability of welding the conductive portion 22 with the groove wall of the first accommodation groove 12110, in the embodiment of the present application, a portion between the first groove 126 and the first accommodation groove 12110 may be laser-welded with the conductive portion 22, that is, the spacer 127 shown in fig. 13 and the conductive portion 22 may be laser-welded. The thickness of the spacer 127 of the first pole 12 between the first groove 126 and the first receiving groove 12110 is thinner, the spacer 127 isolates the first groove 126 and the first receiving groove 12110, a side wall surface of the spacer 127, which is close to the active material coating portion 21, can serve as the first end wall 12111, and when the conductive portion 22 needs to be welded with the first end wall 12111, the welding of the conductive portion 22 and the first end wall 12111 is facilitated through the first groove 126 due to the relatively thinner thickness of the spacer 127, so that the convenience and reliability of the welding are improved.

In some embodiments, the first receiving groove 12110 may be configured in a shape having a cross-sectional length greater than a width, such as a rectangle, an oval, an oblong, etc., and the welding of the conductive part 22 with the first pole 12 may be an elongated welding parallel to the length direction of the first receiving groove 12110 to improve welding reliability and increase overcurrent performance. Illustratively, when the conductive portion 22 is welded to the first end wall 12111 to form a weld as a long-strip-shaped weld, the width of the weld may be greater than or equal to 6mm, and the distance of the weld from the first side wall 12113 may be greater than or equal to 1mm, so as to ensure the convenience and reliability of welding while ensuring the overcurrent capability of the battery cell 10.

With reference to fig. 12, further, the housing assembly 1 may further include a slot cover 7, where the slot cover 7 is provided on the first pole 12 and covers the notch of the first groove 126.

In the above technical scheme, through setting up the capping 7 of the first recess 126 of closing cap for first utmost point post 12 can realize through capping 7 with the indirect electric connection of converging the part, can set up through the position and the structure to capping 7, make capping 7 more convenient and the electric connection area of converging the part bigger with the electricity. Therefore, the provision of the slot cover 7 can facilitate the electrical connection between adjacent battery cells 10 in the battery 100, and since the position where the battery cell 10 is electrically connected to the battery cell 10 is located at the slot cover 7, the electrical connection position between the conductive portion 22 and the first pole 12 can be separated by the first groove 126, and the interference between the two is less, so that the stability and reliability of the battery cell 10 can be further improved.

The specific configuration of the cell assembly 2 according to the embodiment of the present application is not limited, and may include, but is not limited to, the following two embodiments.

Referring to fig. 13 to 14, in the first embodiment, the active material coating portion 21 includes a current collector 211 and an active material layer 212 disposed on the current collector 211, the conductive portion 22 includes tab portions 221 electrically connected to the current collector 211, the tab portions 221 include a plurality of tab pieces 2211, the tab pieces 2211 are electrically connected to the current collector 211, but are not coated with the active material, and may be formed by directly die-cutting the current collector 211, the positions of the tab pieces 2211 near the current collector 211 are converged (i.e., converged in directions toward each other) to form a first tapered portion 2212, the positions of the tab pieces 2211 far from the current collector 211 are converged and connected to form a second tapered portion 2213, and the first tapered portion 2212 connects the second tapered portion 2213 and the active material coating portion 21. When the receiving portion 121 has the first receiving groove 12110, at least a portion of the second furling portion 2213 may be received in the first receiving groove 12110.

In the above-mentioned embodiments, the plurality of tabs 2211 are only gathered together (i.e., gathered in directions approaching each other) but not connected when the first gathering portion 2212 is formed, and the plurality of tabs 2211 are not only gathered together but also connected into an integral structure when the second gathering portion 2213 is formed. For example, the plurality of tabs 2211 may be connected into an integral plate structure by welding (e.g. ultrasonic welding) to form the second folded portion 2213, but the present application is not limited thereto, and the plurality of tabs 2211 may be assembled and connected into the second folded portion 2213 by, for example, bonding with conductive adhesive, etc., which is not described herein.

In the embodiment of the present application, the tab 2211 is divided into the tab 2211 of the positive electrode and the tab 2211 of the negative electrode, the tabs 2211 of the positive electrode that need to be folded together are stacked together and subjected to ultrasonic pre-welding to form the second folded portion 2213 of the positive electrode, so that the interlayer gap can be reduced, and the tabs 2211 of the fluffy multiple positive electrodes form a sheet structure with a certain rigidity. Similarly, the tabs 2211 of the cathodes to be folded together are stacked together and subjected to ultrasonic pre-welding to form the second folding part 2213 of the cathodes, so that interlayer gaps can be reduced, and the fluffy tabs 2211 of the cathodes form a plate structure with certain rigidity.

In the above-mentioned technical solution, the "the positions of the plurality of tabs 2211 close to the current collector 211 are converged to form the first furling portion 2212, the positions of the plurality of tabs 2211 far from the current collector 211 are converged and connected to form the second furling portion 2213" is intended to illustrate: along the extending direction of the tab 2211, the first collecting portion 2212 and the second collecting portion 2213 are sequentially disposed along the direction away from the current collector 211, and specific positions of the first collecting portion 2212 and the second collecting portion 2213 are not limited, that is, how close the first collecting portion 2212 is to the current collector 211 and how far the second collecting portion 2213 is to the current collector 211 are not required. In some alternative examples, the current collector 211 and the tab 2211 may be a single piece, such as an integrally formed aluminum foil for a positive electrode tab, an integrally formed copper foil for a negative electrode tab, and so on.

In the above technical solution, since the tab 221 includes the second folded portion 2213 formed by converging and connecting the plurality of tab pieces 2211, at least part of the second folded portion 2213 is accommodated in the first accommodating groove 12110, so that the conductive portion 22 is convenient to connect with the first pole 12, the space of the first pole 12 can be fully utilized, and the volumetric energy density of the battery cell 10 can be improved.

Referring to fig. 12 to 14, in the first embodiment, at least part of the first tapered portion 2212 is received in the first receiving groove 12110. In the above technical solution, at least part of the first furling portion 2212 and at least part of the second furling portion 2213 of the tab portion 221 are both accommodated in the first accommodating groove 12110, so that the space in the first pole 12 can be more fully utilized, the occupied space of the tab portion 221 in the housing 11 is further reduced, the active material coating portion 21 with a larger size is accommodated, the volumetric energy density of the battery cell 10 is improved, and the redundancy of the tab portion 221 in the housing 11 can be better reduced, so that the probability of shorting the tab portion 221 with the active material coating portion 21 is further reduced.

In this embodiment, the second furled portion 2213 is directly or indirectly electrically connected to the first pole 12. For example, referring to fig. 12, when the second folded portion 2213 is directly electrically connected to the first pole 12, such as when the second folded portion 2213 is welded (e.g., laser welded) to the first pole 12, the structure of the battery cell assembly 2 can be simplified, parts can be reduced, the assembly process can be simplified, and the assembly efficiency can be improved. The second folded portion 2213 is not limited to a direct electrical connection manner and a position with the first pole 12. For example, the electrical connection position between the second collecting portion 2213 and the first pole 12 may be located at the first end wall 12111 and/or the first side wall 12113, further, the electrical connection position between the second collecting portion 2213 and the first end wall 12111 may extend along the length direction or the width direction of the first end wall 12111, still further, the first end wall 12111 has a first sink 12112, the electrical connection position between the second collecting portion 2213 and the first end wall 12111 may be located in the first sink 12112, and so on, and the corresponding technical effects may be described in the above embodiments, which are not repeated herein.

Alternatively, the conductive portion 22 may further be provided with a switching piece 222 according to the requirement, and the second folded portion 2213 is indirectly and electrically connected to the first pole 12. Specifically, referring to fig. 13, when the conductive portion 22 includes the switching piece 222, the switching piece 222 is connected with the second folded portion 2213, and the conductive portion 22 is electrically connected with the first pole 12 through the switching piece 222. At this time, at least part of the adapter piece 222 is accommodated in the first accommodation groove 12110, and in this example, at least part of the second folded portion 2213 is also accommodated in the first accommodation groove 12110, but the first folded portion 2212 may or may not be accommodated in the first accommodation groove 12110.

In the above-described embodiments, the active material coating portion 21 may be electrically connected to the first pole 12 through the first folded portion 2212, the second folded portion 2213, and the switching piece 222 in this order, and the position where the conductive portion 22 is electrically connected to the first pole 12 is located on the switching piece 222, for example, the electrical connection may be achieved by welding (e.g., laser welding) the switching piece 222 and the first pole 12. The tab 222 and the tab 2211 are two separate members, and are connected by welding (e.g., ultrasonic welding) or the like.

In the above-mentioned technical solution, on the one hand, by accommodating at least part of the second collecting portion 2213 and at least part of the adapting piece 222 in the first accommodating groove 12110, the space in the first pole 12 can be more fully utilized, and the occupied space of the conductive portion 22 in the housing 11 can be further reduced, so as to improve the volumetric energy density of the battery cell 10. When at least part of the first folded portion 2212 and at least part of the second folded portion 2213 are respectively received in the first receiving groove 12110 by at least part of the switching piece 222, the space in the first pole 12 can be further fully utilized, and the occupied space of the conductive portion 22 in the housing 11 can be more effectively reduced, so as to further increase the volumetric energy density of the battery cell 10.

On the other hand, the transfer piece 222 realizes indirect electric connection between the second gathering part 2213 and the first pole 12, and the transfer piece 222 can be welded with the first pole 12 by utilizing a part avoiding the second gathering part 2213, so that the transfer piece 222 and the first pole 12 are firmly welded, the welding cracking risk is low, and the reliability and the stability of the battery cell 10 can be further improved; meanwhile, the first tab 12 and the tab 2211 are electrically connected by the switching piece 222, and the construction of the tab 2211 can also be simplified.

The manner and location of direct electrical connection of the adapter piece 222 to the first pole 12 is not limited. For example, the tab 222 is electrically connected to the first pole 12 by soldering. For example, the electrical connection position between the adapter piece 222 and the first pole 12 may be located on the first end wall 12111 and/or the first side wall 12113, further, the electrical connection position between the adapter piece 222 and the first end wall 12111 may extend along the length direction or the width direction of the first end wall 12111, still further, the first end wall 12111 has a first sink 12112, the electrical connection position between the adapter piece 222 and the first end wall 12111 may be located in the first sink 12112, and so on, which will not be described herein. When the electrical connection position of the switching piece 222 and the first pole 12 is located at the first end wall 12111 and/or the first side wall 12113, since at least part of the switching piece 222 is received in the first receiving groove 12110, the structure of the switching piece 222 can be simplified, redundancy can be reduced, and cost can be reduced.

Referring to fig. 13 to 14, in the second embodiment, the active material coating portion 21 includes a current collector 211 and an active material layer 212 disposed on the current collector 211, the conductive portion 22 includes a tab portion 221 and a switching piece 222, the tab portion 221 includes a plurality of tabs 2211 electrically connected to the current collector 211, the plurality of tabs 2211 are converged at positions close to the current collector 211 to form a first converging portion 2212, the plurality of tabs 2211 are converged at positions far from the current collector 211 and connected to form a second converging portion 2213, and the switching piece 222 is electrically connected to the second converging portion 2213. When the receiving part 121 has the first receiving groove 12110, at least part of the switching piece 222 may be received in the first receiving groove 12110 and electrically connected with the first pole 12.

In the above-mentioned technical solution, in the second embodiment, compared with the solution of the first embodiment including the switching piece 222, at least a portion of the switching piece 222 is accommodated in the first accommodating groove 12110, but the relative position between the tab portion 221 and the first accommodating groove 12110 is not limited, that is, at least a portion of the tab portion 221 may be accommodated in the first accommodating groove 12110, and the tab portion 221 may also be completely located outside the first accommodating groove 12110, so as to meet different structural design requirements.

In the above technical solution, at least a portion of the switching piece 222 is accommodated in the first accommodating groove 12110, so that the switching piece 222 can occupy the space in the first pole 12, thereby reducing the occupied space of the switching piece 222 in the housing 11, accommodating the larger-sized active material coating portion 21, improving the volumetric energy density of the battery cell 10, reducing the short circuit probability of the switching piece 222 and the active material coating portion 21, and reducing the risk of short circuit of the battery cell assembly 2, so as to improve the stability and reliability of the battery cell 10.

In addition, by adopting the switching piece 222 to realize indirect electrical connection between the second gathering part 2213 and the first pole 12, the switching piece 222 can be welded with the first pole 12 by utilizing a part avoiding the second gathering part 2213, so that the welding between the switching piece 222 and the first pole 12 is firm, the welding cracking risk is low, and the reliability and stability of the battery cell 10 can be further improved; meanwhile, the first tab 12 and the tab 2211 are electrically connected by the switching piece 222, and the construction of the tab 2211 can also be simplified.

For example, in some alternative embodiments, such as the first embodiment or the third embodiment described above, the conductive portion 22 may be composed of only the positive electrode tab and the negative electrode tab in each electrode assembly 2a when the second folded portion 2213 is directly electrically connected to the first electrode post 12. For example, in other examples, such as the first or second example above, or the third or fourth example below, when the second folded portion 2213 is indirectly electrically connected to the first pole 12 through the switching pieces 222, the conductive portion 22 may be composed of both the positive and negative electrode tabs in each electrode assembly 2a and each switching piece 222.

In some embodiments, when the cell assembly 2 includes two electrode assemblies 2a, the tabs 2211 of the two electrode assemblies 2a may be folded together with the folded position being located at a central position between the two electrode assemblies 2a to form a symmetrical folded form (e.g., as shown in fig. 14 and 15 (a)). Alternatively, in some other embodiments, when the tabs 2211 of two electrode assemblies 2a are folded together, the folded position may also be biased toward one of the electrode assemblies 2a to form an asymmetric folded form (e.g., as shown in fig. 15 (b) and 15 (c)). The electrode assembly 2a may be in the form of a full tab (e.g., as shown in fig. 15 (a)), or may be in the form of a half tab (e.g., as shown in fig. 14, 15 (b), and 15 (c)).

Of course, the present application is not limited thereto, and the tab 2211 of the same polarity of the two electrode assemblies 2a may not be folded together. For example, the tab 2211 of each electrode assembly 2a is individually folded according to the positive and negative electrodes, that is, the positive tab of one electrode assembly 2a is individually folded, and the positive tab of the other electrode assembly 2a is also individually folded, which is not described herein.

It should be noted that the accommodating portion 121 of the embodiment of the present application is not limited to the form having to have the first accommodating groove 12110, and some other alternative embodiments will be given later, for example.

Illustratively, in some embodiments of the present application, referring to fig. 16, the receiving portion 121 may also be provided to include a second receiving groove 12120, the surface of the first electrode 12 on the side remote from the active material application portion 21 being an outer electrode end surface 123, a notch of the second receiving groove 12120 being formed on the outer electrode end surface 123, the second receiving groove 12120 communicating with the interior of the housing 11 through the first through hole 12130, and the conductive portion 22 penetrating the first through hole 12130 and being at least partially received in the second receiving groove 12120.

It is understood that the second receiving groove 12120 is a groove body having a groove-like structure with a certain depth. For example, when the first pole 12 is provided at the upper end wall of the housing 11, the pole outer end face 123 is the upper surface of the first pole 12, the second accommodation groove 12120 is formed as an accommodation groove in which a notch is opened upward, and a groove wall is depressed downward. For another example, when the first pole 12 is provided at the lower end wall of the housing 11 and the pole outer end face 123 is the lower surface of the first pole 12, the second accommodation groove 12120 is formed as an accommodation groove in which a notch is opened downward and a groove wall is recessed upward.

In the above technical solution, referring to fig. 16, on one hand, the first pole 12 is provided with the second accommodation groove 12120, so that the weight of the first pole 12 can be reduced to a certain extent, so as to improve the weight energy density of the battery cell 10 and the battery 100; on the other hand, since the notch of the second accommodation groove 12120 is formed on the pole outer end face 123, and the pole outer end face 123 is the surface of the first pole 12 on the side away from the active material coating portion 21, so that the second accommodation groove 12120 can be opened toward the direction away from the active material coating portion 21, when at least part of the conductive portion 22 is accommodated in the second accommodation groove 12120, the accommodation and arrangement of the conductive portion 22 can be easily achieved through the notch of the second accommodation groove 12120, and the electrical connection operation of the conductive portion 22 and the first pole 12 and the like can be easily achieved through the notch of the second accommodation groove 12120, and thus the production difficulty of the battery cell 10 can be reduced, and the production efficiency of the battery cell 10 can be improved.

Meanwhile, since the second accommodation groove 12120 is communicated with the inside of the case 11 through the first through hole 12130, the second accommodation groove 12120 can also be used as a buffer and temporary storage structure of the electrolyte, so that more electrolyte can be accommodated in the case 11, and the electrolyte is lost in the charging and discharging process of the battery cell 10, so that the service life of the battery cell 10 can be prolonged when the electrolyte is more; and also because the second receiving groove 12120 can be communicated with the inside of the housing 11 through the first through hole 12130, the second receiving groove 12120 can also be used as a receiving and buffering structure for gas generated inside the battery cell assembly 2, so that the expansion of the battery cell 10 is reduced, and the reliability and stability of the battery cell 10 are improved.

It should be noted that, when the accommodating portion 121 has the second accommodating groove 12120, the conductive portion 22 is disposed through the first through hole 12130 and is at least partially accommodated in the second accommodating groove 12120, the electrical connection position between the conductive portion 22 and the first pole 12 is not limited.

Illustratively, when the conductive portion 22 is disposed through the first through hole 12130 and at least partially received in the second receiving groove 12120, in some embodiments of the present application, the electrical connection position of the conductive portion 22 and the first pole 12 is located on the hole wall of the first through hole 12130 formed by the first pole 12.

In the above technical solution, the electrical connection position between the conductive portion 22 and the first pole 12 is disposed on the hole wall of the first through hole 12130, so that the electrical connection operation between the conductive portion 22 and the first pole 12 is facilitated through the second accommodating groove 12120, and when the electrical connection area between the conductive portion 22 and the first pole 12 is large, the electrical connection between the conductive portion 22 and the first pole 12 can be utilized to seal the first through hole 12130, so as to save sealing cost, reduce electrolyte leakage, and save sealing parts.

Specifically, welding of the conductive part 22 to the wall of the first through hole 12130 may be performed at a position of the first through hole 12130 where it is connected to the second receiving groove 12120, thereby facilitating the operation, and sealing of the first through hole 12130 may be achieved by the welding and the conductive part 22 through control of the welding, so as to improve the leakage of the electrolyte within the case 11 from the first through hole 12130.

As another example, when the conductive portion 22 is disposed through the first through hole 12130 and at least partially received in the second receiving groove 12120, in other embodiments of the present application, the electrical connection position of the conductive portion 22 and the first pole 12 may also be located on the groove wall of the second receiving groove 12120 formed by the first pole 12. Thus, the electrical connection operation is facilitated, for example, when the conductive portion 22 is welded to the groove wall of the second receiving groove 12120 formed by the first pole 12, it is possible to improve the occurrence of problems such as short circuit caused by the conductive particles generated by the welding entering into the housing 11.

Specifically, referring to fig. 16 and 17, the first pole 12 includes a second end wall 12121 and a second side wall 12123, the second end wall 12121 is located on a side of the second side wall 12123 near the active material coating portion 21, the second end wall 12121 and the second side wall 12123 enclose a second accommodating groove 12120, the first through hole 12130 is opened in the second end wall 12121, and an electrical connection position between the conductive portion 22 and the first pole 12 is located on the second end wall 12121 and/or on the second side wall 12123.

More specifically, the conductive portion 22 and the first pole 12 may be electrically connected by welding, so the welding position is the electrical connection position of the conductive portion 22 and the first pole 12. In other embodiments of the present application, the conductive portion 22 and the first pole 12 may be electrically connected instead of welding, for example, by providing conductive adhesive or conductive nails, which will not be described herein.

For simplicity of description, the electrical connection between the conductive portion 22 and the first pole 12 will be described below by taking a soldering position, i.e. an electrical connection position between the conductive portion 22 and the first pole 12 as an example. For example, in some embodiments, the location of the electrical connection of the conductive portion 22 to the first pole 12 is at the second end wall 12121 and/or the second side wall 12123, and may be at least one of the conductive portion 22 and the second end wall 12121 and the second side wall 12123.

In the above-described embodiments, by providing the electrical connection position between the conductive portion 22 and the first pole 12 on at least one of the second end wall 12121 and the second side wall 12123, the second receiving groove 12120 has the function of receiving at least a portion of the conductive portion 22, and the groove wall of the second receiving groove 12120 has the function of electrically connecting with the conductive portion 22, so that the structure of the first pole 12 can be simplified, and the processing of the first pole 12 can be facilitated. Moreover, since the first through hole 12130 is formed in the second end wall 12121, the conductive portion 22 is conveniently inserted into the second receiving groove 12120 through the first through hole 12130, so that the structure of the conductive portion 22 can be simplified, the redundancy of the conductive portion 22 can be reduced, and the cost of the conductive portion 22 can be reduced. In addition, the opening direction of the slot opening of the second receiving slot 12120 enables the conductive part 22 and the slot wall of the second receiving slot 12120 to be easily electrically connected through the slot opening of the second receiving slot 12120, so that the difficulty of electrical connection can be reduced, and the conductive part 22 is electrically connected by using the slot wall of the second receiving slot 12120, so that the area where the conductive part 22 is electrically connected with the first pole 12 is relatively large, the reliability and stability of electrical connection can be improved, and the performance of the battery cell 10 is further improved.

In addition, since the electrical connection position of the conductive portion 22 and the first pole 12 is located in the second accommodation groove 12120, not only the electrical connection position protruding outside the first pole 12 and occupying the space outside the first pole 12, but also the electrical connection position can be protected by the first pole 12, and the reliability and stability of the electrical connection of the conductive portion 22 and the first pole 12 are improved.

Referring to fig. 16 and 17, in some embodiments, the partial shape of the conductive portion 22 matches the partial shape of the second end wall 12121 and is snugly disposed and electrically connected such that the location at which the conductive portion 22 is electrically connected to the second end wall 12121 extends along the length or width of the second end wall 12121. For example, when the second end wall 12121 is planar, a portion of the conductive portion 22 may be planar and attached to the second end wall 12121, and the attached position may be electrically connected, such as soldered. Therefore, the area of the electric connection can be increased, and the reliability and stability of the electric connection are improved.

It should be noted that the shape of the second end wall 12121 is not limited, and may be, for example, a flat plate-like or arc-like structure. When the second end wall 12121 is a flat plate structure, the second end wall 12121 is disposed at an angle to the axial direction R of the first pole 12, for example, may be a flat plate structure perpendicular to the axial direction R of the first pole 12, or may be an inclined flat plate structure not perpendicular to the axial direction R of the first pole 12, but the inclination direction is not limited.

For example, when the second end wall 12121 is in a flat plate-like structure, as shown in fig. 16 and 17, the angle θ of the second end wall 12121 with respect to the axial direction R of the first pole 12 is equal to 90 °, i.e., the second end wall 12121 is equidistant from the active material application portion 21 in the direction from the first through hole 12130 to the second side wall 12123. Thereby, the welding of the conductive portion 22 with the second end wall 12121 is facilitated.

As another example, in connection with fig. 18, the second end wall 12121 is inclined at an angle θ of more than 90 ° to the axial direction R of the first pole 12, that is, in the direction from the first through hole 12130 to the second side wall 12123, the second end wall 12121 extends obliquely toward the direction approaching the active material application portion 21. Thereby, the extending distance of the conductive portion 22 along the second end wall 12121 may be increased to increase the reliability of the electrical connection. Illustratively, the second end wall 12121 may be angled at an angle θ of 90 ° -145 °, such as 100 °, 110 °, 120 °, 130 °, 140 °, etc., from the axial direction R of the first pole 12, which may allow for ease of processing of the second end wall 12121 and facilitate electrical connection with the conductive portion 22 on the one hand, and may more fully utilize the space within the first pole 12 to accommodate the conductive portion 22 on the other hand.

As another example, in conjunction with fig. 19, the second end wall 12121 forms an angle θ of less than 90 ° with the axial direction R of the first pole 12, i.e., the second end wall 12121 extends obliquely in a direction from the first through hole 12130 to the second side wall 12123, in a direction away from the active material coating portion 21. Thereby, the extending distance of the conductive portion 22 along the second end wall 12121 may be increased to increase the reliability of the electrical connection. Illustratively, the second end wall 12121 may be angled at an angle θ of 45 ° -90 °, such as 50 °, 60 °, 70 °, 80 °, etc., from the axial direction R of the first pole 12, which may allow for ease of processing of the second end wall 12121 and facilitate electrical connection with the conductive portion 22 on the one hand, and may more fully utilize the space within the first pole 12 to accommodate the conductive portion 22 on the other hand.

Of course, the present application is not limited thereto, and in other embodiments of the present application, the position where the conductive portion 22 is electrically connected to the second end wall 12121 may not extend along the length or width direction of the second end wall 12121, and may be a plurality of points that are discretely disposed, for example, the conductive portion 22 has a plurality of portions that are disposed at intervals and are welded to the second end wall 12121, respectively, which will not be described herein.

Referring to fig. 17 again, no matter what the specific value of the included angle θ between the second end wall 12121 and the axial direction R of the first pole 12, in the embodiment of the present application, when the conductive portion 22 is electrically connected to the second end wall 12121, a second sink 12122 may be disposed on the second end wall 12121 according to the requirement, where the second sink 12122 is a recess formed by sinking a portion of the second end wall 12121 toward an end near the active material coating portion. The location where the conductive portion 22 is electrically connected to the second end wall 12121 is at least partially within the second countersink 12122.

In the above technical solution, the portion of the conductive portion 22 located in the second sinking groove 12122 is set to be matched with the shape of the second sinking groove 12122, and is set in a fitting manner to realize electrical connection, so that the second sinking groove 12122 can be utilized to realize the pre-positioning and limiting of the electrical connection position of the conductive portion 22, which is favorable for realizing electrical connection in the alignment position, improving the production efficiency, and improving the stability and reliability of the electrical connection position, so as to ensure the reliability and stability of the charging and discharging operation of the battery cell 10.

It should be noted that, in an embodiment of the present application, a portion of the conductive portion 22 may be configured to match and fit with the shape of the second sidewall 12123, for example, when the second sidewall 12123 is curved, a portion of the conductive portion 22 may also be curved and fit with the second sidewall 12123, and the fit position is electrically connected (e.g. welded) so that the position where the conductive portion 22 is electrically connected with the second sidewall 12123 extends along the second sidewall 12123. Therefore, the area of the electric connection can be increased, and the reliability and stability of the electric connection are improved.

It should be noted that, in other embodiments of the present application, the position where the conductive portion 22 is electrically connected to the second side wall 12123 may not extend along the second side wall 12123, for example, may be a plurality of points that are disposed discretely, for example, a plurality of portions of the conductive portion 22 disposed at intervals are welded to the second side wall 12123 respectively, which is not described herein.

It will be appreciated that the number of second side walls 12123 is not limited and may be dependent on the shape of second receiving slot 12120, however, one end of each second side wall 12123 distal from the slot opening of second receiving slot 12120 is connected to second end wall 12121. Illustratively, when the cross-sectional shape of the second receiving groove 12120 is circular or elliptical, the second end wall 12121 is circular or elliptical, and the number of the second side walls 12123 is one and is ring-shaped around the circumferential edge of the second end wall 12121. Further exemplary, when the cross-sectional shape of the second receiving groove 12120 is rectangular or oblong, the second end wall 12121 is rectangular or oblong, and the number of the second side walls 12123 is four, which are respectively connected to four sides of the second end wall 12121.

It should also be noted that the second receiving groove 12120 is not limited to the form defined by the second end wall 12121 and the second side wall 12123, for example, in some embodiments, in conjunction with fig. 20, an end of each second side wall 12123 remote from the notch of the second receiving groove 12120 extends to the first through hole 12130, such that the second receiving groove 12120 is defined only by the plurality of second side walls 12123, and the conductive portion 22 may be electrically connected to the second side wall 12123.

In some embodiments, referring to fig. 32, the receiving part 121 may have both a third receiving groove 12140 and a second receiving groove 12120, the second receiving groove 12120 being located at a side of the third receiving groove 12140 remote from the active material coating part 21, a notch of the third receiving groove 12140 being formed on the post inner end surface 122 of the first post 12 at a side close to the active material coating part 21, a notch of the second receiving groove 12120 being formed on the post outer end surface 123 of the first post 12 at a side remote from the active material coating part 21, the third receiving groove 12140 and the second receiving groove 12120 being in communication through the first perforation 12130, at this time, a portion of the conductive part 22 being located in the third receiving groove 12140 while the conductive part 22 is also penetrating the first perforation 12130, and the remaining portion of the conductive part 22 being located in the second receiving groove 12120, thereby also making more efficient use of the space in the first post 12, reducing the occupation space of the conductive part 22 in the case 11.

It should be noted that, when the conductive portion 22 is connected to the second end wall 12121 or the second side wall 12123 by means of laser welding, in connection with fig. 20, an angle β between a portion of the conductive portion 22 for welding and an axis of the first through hole 12130 may be set to be greater than 5 ° to reduce a problem of the laser entering the housing 11 through the first through hole 12130 and facilitate the welding operation. Further, when the angle β between the portion of the conductive portion 22 for welding and the axis of the first through hole 12130 is close to 5 °, it may be performed by edge sealing, and the rest may be performed by lap welding.

Referring to fig. 16 again, in the embodiment of the present application, the connection manner of the first pole 12 and the housing 11 is not limited, and may be, for example, welding or riveting, for example, when the two are mated by riveting, the housing 11 has a mounting hole 113, and the first pole 12 is mounted at the mounting hole 113 by riveting. Of course, it will be appreciated that the housing 11 may also be provided with mounting holes 113 when the two are welded or otherwise mated, with the first pole 12 being mounted at the mounting holes 113.

Alternatively, in connection with fig. 16, the second receiving groove 12120 may be disposed corresponding to the position of the mounting hole 113, or, on a projection plane perpendicular to the axial direction R of the first pole 12, the orthographic projection of the second receiving groove 12120 is located within the orthographic projection range of the mounting hole 113, so that the second receiving groove 12120 may have a greater depth to accommodate more conductive parts 22, and thus, the occupied space of the conductive parts 22 in the housing 11 may be reduced to a greater extent.

In some embodiments, referring to fig. 16, when the housing 11 has the mounting hole 113 thereon and the first pole 12 is mounted to the mounting hole 113, the depth H3 of the second receiving groove 12120 is greater than or equal to the minimum distance H4 from the pole outer end surface 123 to the mounting hole 113 in the axial direction R of the first pole 12.

The specific shape of the second accommodation groove 12120 is not limited, and may be a regular shape, or may be an irregular shape, such as a rectangular, elliptical, or oblong isosceles cylindrical groove, a rectangular trapezoid groove, a hemispherical groove, or the like. It should be noted that, the oblong shape described herein refers to a shape in which two short sides of a rectangle are replaced by convex curves, for example, a shape shown in fig. 22 (b).

Accordingly, the depth H3 of the second accommodation groove 12120 refers to: the second receiving groove 12120 has a maximum depth in the axial direction R of the first pole 12. Since the depth H3 of the second accommodation groove 12120 is greater than or equal to the minimum distance H4 from the outer end face 123 of the pole to the mounting hole 113 in the axial direction R of the first pole 12, the volume of the first pole 12 can be fully utilized, so that the second accommodation groove 12120 has a larger depth, which is beneficial to accommodating more conductive parts 22, thereby being capable of reducing the occupied space of the conductive parts 22 in the housing 11 to a greater extent, further improving the energy density of the battery cell 10, and further reducing the redundancy of the conductive parts 22 in the housing 11; meanwhile, since the second receiving groove 12120 has a larger depth, gas generation of the battery cell assembly 2 can be also received, reliability and stability of the battery cell 10 can be ensured, and more electrolyte can be also received, so that the service life of the battery cell 10 can be ensured.

It should be noted that the volume of the second receiving groove 12120 is not limited, for example, in some specific examples, the volume of the second receiving groove 12120 (denoted as the third volume V4) that may be used to receive the conductive portion 22 may be greater than or equal to 298mm ³ So that the second accommodation groove 12120 can have a relatively sufficient space to accommodateThe conductive portion 22 and facilitates welding of the conductive portion 22 to the first pole 12. And when the third volume V4 of the second receiving groove 12120 is less than 298mm ³ In this case, the second accommodation groove 12120 has a relatively reduced accommodation capacity for the conductive portion 22, and the difficulty in welding the conductive portion 22 and the first pole 12 is increased. The third volume V4 of the second receiving groove 12120 may be 300mm, for example ³ 、400mm ³ 、500mm ³ 、600mm ³ 、700mm ³ 、800mm ³ 、1000mm ³ Etc.

It should be noted that the third volume V4 of the second accommodation groove 12120 is: the difference between the total volume V5 of the second accommodation groove 12120 and the volume (denoted as the fourth volume V6) of the second accommodation groove 12120, which is required to accommodate other components (e.g., the first cover plate 13 and the second cover plate 14 described herein) other than the conductive portion 22, i.e., v4=v5-V6. For example, in some specific examples, the total volume V5 of the second receiving groove 12120 may be 1400mm ³ -1500mm ³ So that the second accommodation groove 12120 can have a more sufficient space to accommodate the conductive part 22 and other components. For example, the total volume V5 of the second accommodation groove 12120 may be 1420mm ³ 、1440mm ³ 、1460mm ³ 、1480mm ³ 、1490mm ³ Etc.

In the embodiment of the present application, the shape of the first perforation 12130, the number of the first perforation 12130, and the relative positional relationship of the first perforation 12130 and the second receiving groove 12120 are not limited.

Illustratively, with respect to the shape of the first perforation 12130, in conjunction with fig. 21 and 22, in an embodiment of the present application, the shape of the first perforation 12130 may be an elongated shape to fit the sheet-like partial shape of the conductive portion 22, thereby facilitating the sheet-like partial penetration of the conductive portion 22. Meanwhile, when the first through-hole 12130 is in a long bar shape, the second receiving groove 12120 may be configured in a shape in which the length of the cross section is greater than the width, for example, a rectangle, an ellipse, an oblong, etc., and at this time, the length direction of the first through-hole 12130 may be set to coincide with the length direction of the cross section of the second receiving groove 12120, so that the space may be fully utilized. In addition, the welding mark formed by welding the conductive part 22 and the first pole 12 may be a long bar-shaped welding mark parallel to the length direction of the first through hole 12130 to improve welding reliability and increase overcurrent performance. Illustratively, when the conductive portion 22 is welded with the second end wall 12121 to form a weld as a long-strip-shaped weld, the width of the weld may be greater than or equal to 6mm, and the distance of the weld from the second side wall 12123 may be greater than or equal to 1mm, so as to ensure the ease and reliability of welding while ensuring the overcurrent capability of the battery cell 10.

Regarding the size and number of the first through holes 12130, in the embodiment of the present application, the opening size and specific position of the first through holes 12130 on the second receiving groove 12120 are not limited, and the related design may be performed according to the number of the first through holes 12130. For example, the width of the first perforation 12130 may be greater than or equal to 2mm, facilitating the passage of the conductive portion 22. For example, when the first perforation 12130 is provided on the second receiving groove 12120 as only one, in some examples, the first perforation 12130 may be centrally disposed with respect to the second receiving groove 12120 in conjunction with fig. 21 and 22, and in other examples, the first perforation 12130 may be also offset with respect to the center of the second receiving groove 12120 in conjunction with fig. 23. For example, in some embodiments, in conjunction with fig. 23, first perforations 12130 may be provided at an edge of second end wall 12121 to be disposed proximate second side wall 12123, such that the area available for second end wall 12121 may be increased to increase the welding area of conductive portion 22 to second end wall 12121.

It will be appreciated that the conductive portion 22 is folded over for attachment to the second end wall 12121 after passing through the first perforation 12130, but the direction of folding over is not limited. For example, when the first through hole 12130 is centrally disposed with respect to the second receiving groove 12120, the conductive part 22 may be folded toward either side of the first through hole 12130 after passing through the first through hole 12130 (refer to fig. 21), so that the size of the second receiving groove 12120 may be appropriately reduced, and the structural compactness and strength may be enhanced; alternatively, after the conductive portion 22 passes through the first through hole 12130, it may be folded toward opposite sides (in combination with fig. 24) at the same time to reduce the thickness of the welded portion, reduce the welding heat input, and thus reduce the problems of particle splashing, etc.

For example, when the second receiving groove 12120 is provided with a plurality of first through holes 12130, the plurality of first through holes 12130 are arranged in parallel or substantially in parallel in a longitudinal direction to fully utilize the space. In this case, the folding direction after the conductive part 22 passes through the first perforation 12130 may be set according to the relative positional relationship of the plurality of first perforation 12130. For example, when the second accommodation groove 12120 is provided with two first through holes 12130 which are distant from each other (refer to fig. 25), the two conductive parts 22 passing through the two first through holes 12130 may be folded toward each other; when the second receiving groove 12120 is provided with two first through holes 12130 and is close to each other, the two conductive parts 22 passing through the two first through holes 12130 may be folded in a direction away from each other.

It is understood that when the second receiving groove 12120 has a plurality of first through holes 12130, the number of the first poles 12 can be properly reduced, thereby reducing the cost and the process.

Further, in some embodiments, referring to fig. 23 and 24, the first perforation 12130 may be centrally disposed with respect to the active material application portion 21, but the position of the first perforation 12130 with respect to the second receiving groove 12120 is not limited, and may be centrally disposed or offset, such that the conductive portion 22 may be folded corresponding to the center line position of the active material application portion 21 due to the centrally disposed first perforation 12130 with respect to the active material application portion 21.

In some embodiments, in conjunction with fig. 24, a seal 6 may be provided at the first perforation 12130 to ameliorate the problem of electrolyte within the housing 11 leaking out of the first perforation 12130. The material, shape and connection manner of the sealing member 6 with the first through hole 12130 are not limited, and may be designed according to practical requirements.

In some embodiments of the present application, when the receiving portion 121 has the second receiving groove 12120 of any of the above embodiments, the housing assembly 1 may optionally further include a first cover plate 13, the first cover plate 13 being engaged with the first pole 12 and closing the notch of the second receiving groove 12120, the first cover plate 13 being electrically connected with the first pole 12.

In the above technical solution, by providing the first cover plate 13 to close the notch of the second accommodation groove 12120, electrolyte in the casing 11 can be prevented from leaking from the notch of the second accommodation groove 12120, and since the first cover plate 13 closes the notch of the second accommodation groove 12120 and is electrically connected with the first pole 12, indirect electrical connection between the first pole 12 and the current collecting member can be easily achieved by using the first cover plate 13, and the connection area of the electrical connection is advantageously increased, thereby reducing the resistance of the electrical connection.

It should be noted that the fitting manner and fitting position of the first cover plate 13 and the first pole 12 are not limited, as long as the sealing of the notch of the second receiving groove 12120 by the first cover plate 13 can be achieved. For example, in some embodiments, referring to fig. 25, the first cover plate 13 may be welded to the first pole 12, and when machining, the conductive portion 22 may be first passed through the first through hole 12130 and welded to the groove wall of the second receiving groove 12120, and then the first cover plate 13 is welded to the first pole 12 to close the notch of the second receiving groove 12120.

The specific configuration of the first cover 13 is not limited. For example, in some alternative embodiments, referring to fig. 27-29, the first cover 13 includes a first conductive member 131 and a second conductive member 132 that are made of different materials, the first conductive member 131 is mated and electrically connected with the first pole 12, and the second conductive member 132 is mated and electrically connected with the first conductive member 131.

In the above technical solution, the first cover plate 13 is set to be in a composite form, and the first conductive member 131 is set to be the same as the material of the first pole 12, so that the first conductive member 131 and the first pole 12 are convenient to be electrically connected, for example, the first conductive member 131 and the first pole 12 can be easily and reliably and stably connected by welding. And because the materials of the second conductive member 132 and the first conductive member 131 are different, the second conductive member 132 is convenient to be electrically connected with the bus component with a material different from that of the first pole 12, for example, the second conductive member 132 can be easily and reliably and stably connected with the bus component with the same material as the second conductive member 132 by welding.

For example, when the first electrode 12 is a negative electrode, the first electrode 12 is a copper electrode, and the current collecting member is an aluminum sheet, the first conductive member 131 may be made of copper, and the second conductive member 132 may be made of aluminum, and at this time, the first electrode 12 and the first conductive member 131 may be effectively welded, and the second conductive member 132 and the current collecting member may be effectively welded, so that indirect electrical connection between the first electrode 12 and the current collecting member via the first cover plate 13 may be effectively realized. Moreover, the first pole 12 and the first conductive member 131 are made of copper and welded with each other, so that the fluidity is good, cracks are not easy to generate, and the sealing effect of the welded part is improved.

Referring again to fig. 27-29, in some alternative examples, the first conductive member 131 is positioned between the second receiving groove 12120 and the second conductive member 132. In the above-mentioned solution, since the first conductive member 131 is located between the second accommodation groove 12120 and the second conductive member 132, the second accommodation groove 12120 and the second conductive member 132 can be separated, so that when the electrolyte in the housing 11 enters the second accommodation groove 12120 from the first through hole 12130, the first conductive member 131 can be used to prevent the portion of the electrolyte from contacting the second conductive member 132, thereby solving the problem of corrosion of the second conductive member 132 caused by the electrolyte.

It should be noted that the matching manner of the first conductive member 131 and the second conductive member 132 is not limited. For example, in some embodiments, referring to fig. 27 to 29, the first conductive member 131 has a second groove 1311 thereon, and the second conductive member 132 is embedded in the second groove 1311, and a notch of the second groove 1311 is formed on a surface of the first conductive member 131 on a side away from the second receiving groove 12120, so that the second conductive member 132 is exposed from the notch of the second groove 1311. Alternatively, in other embodiments, the first conductive member 131 and the second conductive member 132 may be connected by fastening, clamping, or the like.

It should be further noted that, "exposure" of the second conductive member 132 by the notch of the second groove 1311 refers to: the first conductive member 131 may not cover the second conductive member 132 at the notch of the second groove 1311, and the second conductive member 132 is not required to protrude from the notch of the second groove 1311, for example, the second conductive member 132 may be flush with the surface of the first conductive member 131 on the side away from the second receiving groove 12120, or the second conductive member 132 may protrude from the surface of the first conductive member 131 on the side away from the second receiving groove 12120.

In the above technical solution, on the one hand, the second conductive member 132 is embedded in the first conductive member 131, so that the assembly difficulty of the first conductive member 131 and the second conductive member 132 can be reduced, the stability and convenience of the matching of the first conductive member 131 and the second conductive member 132 are improved, the thickness of the first cover plate 13 can be reduced, the occupation of the first cover plate 13 to the space is reduced, and the space utilization rate of the battery cell 10 is improved. On the other hand. And, since the second conductive member 132 may be exposed from the surface of the first conductive member 131 at a side far from the second receiving groove 12120 through the notch of the second groove 1311, it is advantageous to electrically connect the second conductive member 132 with the bus member outside the first post 12.

Further, since the notch of the second groove 1311 is formed on the surface of the first conductive member 131 on the side away from the second accommodation groove 12120, it is explained that the second groove 1311 is opened toward the direction away from the active material application part 21, so that the portion of the first conductive member 131 for defining the groove wall of the second groove 1311 is located between the second accommodation groove 12120 and the second conductive member 132 to separate the second accommodation groove 12120 from the second conductive member 132, thereby preventing the electrolyte entering the second groove 1311 from contacting the second conductive member 132, reducing leakage of the electrolyte.

Of course, in other embodiments, the first cover 13 may not be a composite formed of multiple materials, for example, in other embodiments of the present application, with reference to fig. 30, the whole first cover 13 may be formed of a non-composite formed of the same material, for example, for adapting to a positive electrode post, which is not described herein.

Referring again to fig. 27-29, in some embodiments, the first cover 13 is further embedded at the notch of the second receiving groove 12120. In the above technical solution, by embedding the first cover plate 13 in the second accommodation groove 12120, the assembly difficulty of the first cover plate 13 and the first pole 12 can be reduced, the assembly stability of the first cover plate 13 and the first pole 12 can be improved, the reliability and convenience of connection can be improved, and the space occupation of the first cover plate 13 outside the first pole 12 can be reduced. Moreover, since the first cover plate 13 is embedded in the notch of the second accommodating groove 12120, a sufficient space can be provided in the second accommodating groove 12120 to accommodate the conductive part 22.

Of course, in other embodiments of the present application, the first cover 13 and the first pole 12 are not limited to be embedded in the second accommodating groove 12120, and the first cover 13 may also be directly covered outside the first pole 12, i.e. directly cover the notch of the second accommodating groove 12120, so as to be convenient to cooperate with the bus member of the battery 100.

Referring again to fig. 27-29, optionally, in an embodiment of the present application, at least part of the wall surface of the first pole 12 where the notch of the second receiving groove 12120 is formed is a guiding inclined surface 12126, and the guiding inclined surface 12126 is used to guide the first cover plate 13 to cooperate with the notch of the second receiving groove 12120. In the above technical solution, by machining the wall surface at the notch of the second accommodation groove 12120 into an inclined surface with guiding function, the assembly difficulty of the first cover plate 13 and the second accommodation groove 12120 can be reduced, and the assembly efficiency of the first cover plate 13 and the second accommodation groove 12120 can be improved. Also, when the first cover plate 13 is welded to the guide slope 12126, it is possible to increase the area of the welded portion, improve the reliability of the welded connection of the first cover plate 13 to the first pole 12, and improve the problem of pool collapse or laser injection into the first pole 12 at the time of welding.

In particular, with reference to fig. 27-29, the second receiving groove 12120 includes a first groove segment 12124 and a second groove segment 12125 located on a side of the first groove segment 12124 proximate to the pole outer end face 123. The cross-sectional area of the second groove section 12125 is larger than that of the first groove section 12124, so that the second accommodating groove 12120 is in a stepped groove shape, and the connection position of the first groove section 12124 and the second groove section 12125 forms a step surface 12127, so that the first cover plate 13 can be embedded in the second groove section 12125 and supported on the step surface 12127 when being embedded in the second accommodating groove 12120.

In the above technical solution, by arranging the second accommodation groove 12120 in the form of a stepped groove, the first cover plate 13 can be stably matched with the notch of the second accommodation groove 12120, so as to improve the connection stability between the first cover plate 13 and the first pole 12, and the groove depth of the first groove segment 12124 can be limited, so that the second accommodation groove 12120 has sufficient space to accommodate the conductive part 22.

Further, when the wall surface at the notch of the first pole 12 where the second receiving groove 12120 is formed is the guide slope 12126, the cross-sectional area of the second groove section 12125 may be set to be gradually increased in a direction approaching the pole outer end surface 123, so that the side wall of the second groove section 12125 is formed as the guide slope 12126, thereby facilitating the processing, and the guide requirement may be simply and effectively satisfied.

Referring to fig. 27-29 again, in the embodiment of the application, the first cover 13 may further be provided with a stress release groove 133 according to the requirement, and the stress release groove 133 is located in the peripheral area of the first cover 13 to assist the first cover 13 in releasing the stress. In the above technical solution, by providing the stress release groove 133 on the first cover plate 13, the stress generated in the processing process of the first cover plate 13 or in the electrical connection process of the first cover plate 13 and the first pole 12 can be released, so as to improve the problems related to deformation or damage caused by the stress of the first cover plate 13.

Specifically, when the first cover plate 13 is welded with the second receiving groove 12120 in an embedded manner, the stress generated by the welding can be released by the stress releasing groove 133, so that the heat transverse conduction can be improved, and the probability of damage or deformation of the first cover plate 13 can be reduced. Meanwhile, when the first cover plate 13 is in the composite form including the first conductive member 131 and the second conductive member 132, the stress release groove 133 may be disposed on the first conductive member 131 and located at the outer peripheral region of the second conductive member 132, and when the first conductive member 131 and the second receiving groove 12120 are embedded and welded, the stress generated by the welding may be released by using the stress release groove 133, thereby improving the lateral heat conduction and reducing the probability of damage or deformation of the second conductive member 132. Moreover, when the second conductive member 132 is embedded and welded with the first conductive member 131, the stress generated by welding can be released by the stress release groove 133, so as to improve the transverse heat conduction and reduce the probability of causing the deformation of the first conductive member 131, which results in the failure of embedding the first conductive member 131 in the second receiving groove 12120.

Referring to fig. 30-31, in the embodiment of the application, the housing assembly 1 may further provide a second cover plate 14 according to requirements, where the second cover plate 14 covers the first through hole 12130 and the conductive portion 22 located in the second accommodating groove 12120.

It should be noted that, when the housing assembly 1 includes the second cover plate 14, the housing assembly 1 may include the first cover plate 13 at the same time or may not include the first cover plate 13 at the same time. Further, when the housing assembly 1 includes the second cover 14 and the first cover 13, the first cover 13 may be a composite form made of multiple materials, or may be a non-composite form made of the same material.

In the above technical solution, at least a portion of the conductive portion 22 is located in the second accommodating groove 12120, the second cover plate 14 covers the conductive portion 22 of the portion, and the second cover plate 14 further covers the first through hole 12130, so that when the electrolyte enters the second accommodating groove 12120 from the first through hole 12130, the problem that the electrolyte overflows from the first polar post 12 in the portion can be improved through the second cover plate 14, thereby improving the reliability of the battery cell 10.

For example, as shown in fig. 30 to 31, when the part of the conductive portion 22 is sandwiched between the second cover plate 14 and the second end wall 12121, the part of the conductive portion 22, the second cover plate 14 and the second end wall 12121 may be welded together by using a laser welding method, so as to improve the connection reliability between the first pole 12 and the conductive portion 22. Also, since the second cover plate 14 can press the conductive part 22, the stability of the conductive part 22 accommodated in the second accommodation groove 12120 can be improved by using the second cover plate 14.

In the embodiment of the present application, the first pole 12 may be an integrally formed pole or a separately formed composite pole. Referring to fig. 30-31 again, for example, the first pole 12 may include a first pole portion 124 and a second pole portion 125 that are made of different materials and electrically connected, the second pole portion 125 is located on a side of the first pole portion 124 away from the active material coating portion 21, the accommodating portion 121 is disposed on the first pole portion 124, or the accommodating portion 121 is disposed on the first pole portion 124 and the second pole portion 125, and the conductive portion 22 is electrically connected to the first pole portion 124.

In the above technical solution, by setting the first pole 12 to be a composite form formed by combining different materials, the first pole portion 124 located on the inner side is used to be accommodated and matched with and electrically connected to the conductive portion 22, and the second pole portion 125 located on the outer side is used to be electrically connected to the bus member or the like, so that the assembly and the electrical connection of the first pole 12 and the related member can be facilitated, the mutual interference between the electrical connection position of the first pole 12 and the conductive portion 22 and the electrical connection position of the bus member of the first pole 12 and the battery 100 can be reduced, and the reliability and the stability of the battery cell 10 can be improved.

For example, when the material of the conductive portion 22 is different from the material of the bus member, the first pole portion 124 may be made of the same material as the conductive portion 22, and the second pole portion 125 may be made of the same material as the bus member, so that the welding of the second pole portion 125 and the bus member, and the welding of the first pole portion 124 and the conductive portion 22 may be facilitated, and the reliability and stability of the electrical connection between the conductive portion 22 and the first pole 12, and the reliability and stability of the electrical connection between the first pole 12 and the bus member may be improved.

Further, when the first pole 12 is in the composite form of the above embodiment and has the second receiving groove 12120 and the first through hole 12130 of any of the above embodiments, in some embodiments, the housing assembly 1 may further include the second cover plate 14 of any of the above embodiments, and at this time, the materials of the second cover plate 14 and the first pole portion 124 may be the same, and the first pole portion 124 and the second cover plate 14 may be electrically connected, so that the reliability and stability of the electrical connection between the first pole portion 124 and the second cover plate 14 may be improved. For example, welding may be used to join the first pole portion 124 and the second cover plate 14.

For example, referring to fig. 30 to 31, when the first electrode 12 is a negative electrode, the first electrode portion 124 is a copper material, the second electrode portion 125 is an aluminum material, and the bus member is an aluminum sheet, the second cover plate 14 may be made of a copper material, and the first cover plate 13 may be made of an aluminum material, and at this time, the second cover plate 14 and the first electrode portion 124 may be effectively welded, the second electrode portion 125 and the first cover plate 13 may be effectively welded, and the first cover plate 13 and the bus member may be effectively welded.

In the embodiment of the present application, when the receiving part 121 has the second receiving groove 12120, the fitting of the battery cell assembly 2 to the second receiving groove 12120 is not limited according to the configuration of the battery cell assembly 2, and may include, for example, but not limited to, the following two embodiments of the third embodiment and the fourth embodiment.

Referring to fig. 32, in the third embodiment, the active material coating portion 21 includes a current collector 211 and an active material layer 212 disposed on the current collector 211, the conductive portion 22 includes tab portions 221 electrically connected to the current collector 211, the tab portions 221 include a plurality of tab pieces 2211, the plurality of tab pieces 2211 are converged to form a first converging portion 2212 at positions close to the current collector 211, the plurality of tab pieces 2211 are converged and connected to form a second converging portion 2213 at positions far from the current collector 211, and the first converging portion 2212 connects the second converging portion 2213 and the active material coating portion 21. When the accommodating portion 121 has the second accommodating groove 12120, at least part of the second furling portion 2213 is accommodated in the second accommodating groove 12120.

It should be noted that, in the third embodiment, the specific structure of the battery cell assembly 2 is substantially the same as that of the battery cell assembly 2 in the first embodiment, and the description of the first embodiment may be referred to herein, which is not repeated herein. In the third embodiment, since the tab 221 includes the second folded portion 2213 formed by converging and connecting the plurality of tabs 2211, at least part of the second folded portion 2213 can be easily accommodated in the second accommodating groove 12120, so as to facilitate the assembly of the conductive portion 22 and the first pole 12.

In some alternative examples, in conjunction with fig. 32, the position where the first gathering portion 2212 is connected to the second gathering portion 2213 may be disposed corresponding to the first through hole 12130, that is, on a projection plane perpendicular to the axial direction R of the first pole 12, the orthographic projection of the position where the first gathering portion 2212 is connected to the second gathering portion 2213 is located within the orthographic projection range of the first through hole 12130, so that the second gathering portion 2213 extends into the first through hole 12130 at a shorter distance and enters into the second accommodating groove 12120, thereby reducing redundancy and reducing cost.

It can be appreciated that, the folded position of the tab 2211 may be designed according to the position of the first through hole 12130, for example, in the form of symmetrical folding as described above, or in the form of asymmetrical folding, so that the connection position of the first folded portion 2212 and the second folded portion 2213 is set corresponding to the first through hole 12130, which is not described herein. Further, referring to the above, when the second tapered portion 2213 is formed in a sheet structure by ultrasonic pre-welding, the second tapered portion 2213 is facilitated to pass through the first through hole 12130.

In addition to the second accommodation groove 12120, in this third embodiment, the accommodation portion 121 may also have a third accommodation groove 12140 in addition to the second accommodation groove 12120, the third accommodation groove 12140 being located on the side of the second accommodation groove 12120 close to the active material application portion 21, the surface of the first pole 12 on the side facing the active material application portion 21 being the pole inner end face 122, and the notch of the third accommodation groove 12140 being formed on the pole inner end face 122, the third accommodation groove 12140 and the second accommodation groove 12120 communicating through the first perforation 12130, at least part of the first folded portion 2212 may be accommodated in the third accommodation groove 12140 at this time.

In the above technical solution, at least part of the first furling portion 2212 of the tab portion 221 is accommodated in the third accommodating groove 12140, at least part of the second furling portion 2213 is accommodated in the second accommodating groove 12120, so that the space in the first pole 12 can be more fully utilized, the occupied space of the tab portion 221 in the housing 11 is further reduced, so as to accommodate the active material coating portion 21 with a larger size, the energy density of the battery cell 10 is improved, and the redundancy of the tab portion 221 in the housing 11 can be better reduced, the probability of shorting the tab portion 221 and the active material coating portion 21 is further reduced, and the risk of inserting the tab portion 221 back towards the active material coating portion 21 is further reduced.

The specific shape of the third accommodation groove 12140 is not limited, and may be a regular shape, or may be an irregular shape, for example, a prismatic groove having a rectangular, elliptical, or oblong cross section, a trapezoid groove having a rectangular cross section and a gradually changing cross section, a hemispherical groove having a circular cross section and a gradually changing cross section, a semi-ellipsoidal groove having an elliptical cross section and a gradually changing cross section, or the like. In some embodiments of the present application, the third receiving groove 12140 may be configured in a shape having a cross-section with a length greater than a width, such as a rectangle, an oval, an oblong, etc., to facilitate the receiving of the first furling portion 2212.

In the third embodiment, the second tapered portion 2213 is directly or indirectly electrically connected to the first pole 12. For example, when the second folded portion 2213 is directly electrically connected to the first pole 12, such as when the second folded portion 2213 is welded to the first pole 12, the structure of the battery module 2 can be simplified, the components can be reduced, the assembly process can be simplified, and the assembly efficiency can be improved. The second folded portion 2213 is not limited to a direct electrical connection manner and a position with the first pole 12. For example, the electrical connection position between the second collecting portion 2213 and the first pole 12 may be located in the second end wall 12121 and/or the second side wall 12123, further, the electrical connection position between the second collecting portion 2213 and the second end wall 12121 may extend along the length direction or the width direction of the second end wall 12121, still further, the second end wall 12121 has a second sink 12122, the electrical connection position between the second collecting portion 2213 and the second end wall 12121 may be located in the second sink 12122, and so on, which may refer to the description of the above embodiments for corresponding technical effects, which are not repeated herein.

Alternatively, the conductive portion 22 may further be provided with a switching piece 222 according to the requirement, and the second folded portion 2213 is indirectly and electrically connected to the first pole 12. Specifically, referring to fig. 33, when the conductive portion 22 includes the switching piece 222, the switching piece 222 is connected with the second folded portion 2213, and the conductive portion 22 is electrically connected with the first pole 12 through the switching piece 222. At this time, at least part of the adapter piece 222 is accommodated in the second accommodation groove 12120, and in this example, at least part of the second folded portion 2213 is also accommodated in the second accommodation groove 12120.

In the above technical solution, by accommodating at least part of the second collecting portion 2213 and at least part of the adapting piece 222 in the second accommodating groove 12120, the space in the first pole 12 can be more fully utilized, and the occupied space of the conductive portion 22 in the housing 11 can be further reduced, so as to further improve the volumetric energy density of the battery cell 10. Further, by providing the tab 222 of the sheet structure, the tab 222 is facilitated to protrude into the second accommodation groove 12120 through the first perforation 12130.

The manner and location of direct electrical connection of the adapter piece 222 to the first pole 12 is not limited. For example, the tab 222 is electrically connected to the first pole 12 by soldering. For example, the electrical connection position between the adapter piece 222 and the first pole 12 may be located on the second end wall 12121 and/or the second side wall 12123, further, the electrical connection position between the adapter piece 222 and the second end wall 12121 may extend along the length direction or the width direction of the second end wall 12121, still further, the second end wall 12121 has a second sink 12122, the electrical connection position between the adapter piece 222 and the second end wall 12121 may be located in the second sink 12122, and so on, which may refer to the description of the above embodiments for corresponding technical effects, which are not repeated herein. When the electrical connection position of the switching piece 222 and the first pole 12 is located at the second end wall 12121 and/or the second side wall 12123, since at least part of the switching piece 222 is received in the second receiving groove 12120, the structure of the switching piece 222 can be simplified, redundancy can be reduced, and cost can be reduced.

Referring to fig. 33, in the fourth embodiment, the active material coating portion 21 includes a current collector 211 and an active material layer 212 disposed on the current collector 211, the conductive portion 22 includes tab portions 221 and a transfer piece 222, the tab portions 221 include a plurality of tab pieces 2211 electrically connected to the current collector 211, the plurality of tab pieces 2211 are converged to form a first converging portion 2212 at a position close to the current collector 211, the plurality of tab pieces 2211 are converged and connected to form a second converging portion 2213 at a position far from the current collector 211, and the transfer piece 222 is electrically connected to the second converging portion 2213. When the receiving part 121 has the second receiving groove 12120, at least a portion of the switching piece 222 may be received in the second receiving groove 12120 and electrically connected with the first pole 12.

In the above-mentioned technical solution, compared with the solution in which the third embodiment includes the switching piece 222, in the fourth embodiment, at least part of the switching piece 222 is accommodated in the second accommodation groove 12120, but the relative position between the tab portion 221 and the second accommodation groove 12120 is not limited, that is, at least part of the tab portion 221 may be accommodated in the second accommodation groove 12120, and the tab portion 221 may also be completely located outside the second accommodation groove 12120, so as to meet different structural design requirements.

In the above technical solution, at least a portion of the switching piece 222 is accommodated in the second accommodation groove 12120, so that the switching piece 222 can occupy the space in the first pole 12, thereby reducing the occupied space of the switching piece 222 in the housing 11, accommodating the larger-sized active material coating portion 21, improving the energy density of the battery cell 10, reducing the probability of shorting the switching piece 222 and the active material coating portion 21, and reducing the risk of shorting the battery cell assembly 2, so as to improve the stability and reliability of the battery cell 10.

In some other embodiments of the present application, referring to fig. 34, the receiving portion 121 has a fourth receiving groove 12150, the surface of the first electrode 12 on the side remote from the active material application portion 21 is an electrode outer end surface 123, a notch of the fourth receiving groove 12150 is formed on the electrode outer end surface 123, the fourth receiving groove 12150 communicates with the inside of the case 11 through the second through hole 12160, the conductive portion 22 may not be received in the fourth receiving groove 12150, for example, the conductive portion 22 may be penetrated through the second through hole 12160, and an electrical connection position of the conductive portion 22 and the first electrode 12 is located at a hole wall of the second through hole 12160 formed by the first electrode 12.

In the above embodiment, by providing the fourth receiving groove 12150, the electrical connection of the conductive part 22 and the hole wall of the second through hole 12160 can be easily achieved. Also in some cases, sealing of the second perforation 12160 may be accomplished with the electrical connection of the conductive portion 22 to the first pole 12. For example, welding of the conductive part 22 to the wall of the second through hole 12160 may be performed at a position of the second through hole 12160 connected to the fourth receiving groove 12150, thereby facilitating the operation, and sealing of the second through hole 12160 may be achieved by the welding and the conductive part 22 through control of the welding, thereby improving the leakage of the electrolyte within the case 11 from the second through hole 12160.

The specific shape of the fourth accommodation groove 12150 is not limited, and may be a regular shape, or may be an irregular shape, such as a rectangular, elliptical, or oblong isosceles cylindrical groove in cross section, a rectangular trapezoid groove in cross section with a gradual change in cross section, a hemispherical groove in cross section with a circular shape and a gradual change in cross section, or a semi-ellipsoidal groove in cross section with an elliptical shape and a gradual change in cross section, or the like.

In an embodiment of the present application, the shape of the second perforation 12160 may be an elongated shape to fit the sheet-like partial shape of the conductive portion 22, thereby facilitating the sheet-like partial penetration of the conductive portion 22. Meanwhile, when the second through-hole 12160 is in a long bar shape, the fourth receiving groove 12150 may be configured in a shape in which the length of the cross section is greater than the width, for example, a rectangle, an ellipse, an oblong, etc., and at this time, the length direction of the second through-hole 12160 may be set to coincide with the length direction of the cross section of the fourth receiving groove 12150, so that the space may be fully utilized.

It should be noted that the accommodating portion 121 according to the embodiment of the present application is not limited to the form having at least one accommodating groove. For example, in some other embodiments of the present application, in combination with fig. 35, the receiving portion 121 may have only a third through hole 12170, the surface of the first electrode 12 on the side facing the active material application portion 21 is an electrode inner end surface 122, the surface of the first electrode 12 on the side facing away from the active material application portion 21 is an electrode outer end surface 123, the third through hole 12170 is in the form of a through hole and penetrates the electrode inner end surface 122 and the electrode outer end surface 123, and at least part of the conductive portion 22 penetrates the third through hole 12170. The electrical connection position between the conductive portion 22 and the first pole 12 is not limited, for example, the electrical connection position may be located on a hole wall of the first pole 12 where the third through hole 12170 is formed, or the conductive portion 22 may pass through the third through hole 12170 so that the electrical connection position is located on the pole outer end face 123 outside the third through hole 12170, or the like. The shape of the third through hole 12170 is not limited, and may be a regular hole having a uniform cross section, a variable cross section hole having a non-uniform cross section, or the like. Also, the cross-sectional shape of the third through hole 12170 is not limited, and may be, for example, a long strip shape, such as a rectangle, an oval, or an oblong shape, etc., so as to be adapted to the sheet-like local shape of the conductive portion 22, so as to facilitate the sheet-like local penetration of the conductive portion 22 into the third through hole 12170, which is not described herein.

Referring to fig. 36 to 38, in some embodiments of the present application, the battery cell 10 further includes a support 3, the support 3 is located in the housing 11, and the support 3 is located at a side of the active material coating portion 21 near the first pole 12, the support 3 has a dodging hole 31 for dodging the conductive portion 22, and the conductive portion 22 can extend to a side of the support 3 far from the active material coating portion 21 through the dodging hole 31 to be welded with the first pole 12, thereby ensuring normal charge and discharge operations of the battery cell 10.

In the above technical solution, by providing the bracket 3 on the side of the active material coating portion 21 near the first pole 12, so that the active material coating portion 21 can be spaced from the housing 11 by using the bracket 3, the reliability of the battery cell 10 is improved, and the escape hole 31 is provided on the bracket 3, the conductive portion 22 can be guided and restrained to cooperate with the first pole 12 by passing through the escape hole 31, so that the conductive portion 22 does not need to bypass from the edge of the bracket 3 to approach the first pole 12, the arrangement of the conductive portion 22 can be simplified, the material of the conductive portion 22 can be saved, the cost can be reduced, and the conductive portion 22 can be supported and guided by the bracket 3 to cooperate with the first pole 12, so that the risk of short-circuit connection between the conductive portion 22 and the active material coating portion 21 can be reduced, and the reliability of the battery cell 10 can be further improved.

With reference to fig. 36 to 38, alternatively, the bracket 3 is provided with a guide portion 32, the guide portion 32 surrounds at least part of the escape hole 31, and the guide portion 32 extends at least partially to the accommodating portion 121.

It should be noted that, the guiding portion 32 protrudes from the bracket 3 and extends into the accommodating portion 121, and at least part of the avoidance hole 31 is formed in the guiding portion 32, so that when the conductive portion 22 is penetrating the avoidance hole 31, at least part of the conductive portion 22 can be easily accommodated in the accommodating portion 121, thereby improving the assembly efficiency of the conductive portion 22; meanwhile, through the arrangement of the guide part 32, the cooperation between the bracket 3 and the first pole 12 and the cooperation between the bracket 3 and the conductive part 22 are tighter and more reliable, so that the structure of the battery cell 10 is compact, and the improvement of the energy density of the battery cell 10 is facilitated.

With reference to fig. 36-38, optionally, the bracket 3 is provided with a third recess 38, and at least a portion of the first pole 12 located in the housing 11 is received in the third recess 38.

In the above technical solution, by providing the third groove 38 on the bracket 3, at least part of the portion of the first pole 12 located in the housing 11 is received in the third groove 38 of the bracket 3, so that the compactness of the structure can be improved, the occupied space of the bracket 3 in the housing 11 can be reduced, and the volume energy density of the battery cell 10 can be improved.

In addition, in some embodiments, the guiding portion 32 may be used to define the third groove 38, so that the structure of the support 3 may be simplified, the design and processing difficulty of the support 3 may be reduced, which is beneficial to increasing the wall thickness of the guiding portion 32 and improving the guiding reliability of the conductive portion 32.

Referring to fig. 36 to 38, alternatively, the escape hole 31 includes a first hole section 311 and a second hole section 312, the second hole section 312 is located on a side of the first hole section 311 near the active material coating portion 21, and the cross-sectional area of the second hole section 312 gradually increases in a direction away from the first hole section 311. When the active material coating portion 21 includes the current collector 211 and the active material layer 212 disposed on the current collector 211, the conductive portion 22 includes the tab portion 221 electrically connected to the current collector 211, the tab portion 221 includes a plurality of tabs 2211, the positions of the tabs 2211 near the current collector 211 are converged to form a first furling portion 2212, the positions of the tabs 2211 far away from the current collector 211 are converged and connected to form a second furling portion 2213, and the first furling portion 2212 connects the second furling portion 2213 and the active material coating portion 21, at least a portion of the first furling portion 2212 may be accommodated in the second hole section 312, and the second furling portion 2213 may be disposed through the first hole section 311.

In the above technical solution, by arranging the avoidance hole 31 to include the second hole section 312 gradually expanding toward the direction of the active material coating portion 21, so that the second hole section 312 is convenient to accommodate more first furling portions 2212, the compactness of the cooperation of the bracket 3 and the cell assembly 2 is improved, so that the overall volume of the battery cell 10 is smaller, the battery 100 can accommodate more battery cells 10, and the volumetric energy density of the battery 100 can be improved. In addition, in the above-mentioned technical solution, the specific explanation of the first gathering portion 2212 and the second gathering portion 2213 has been described in the foregoing embodiments, and will not be repeated here.

In some embodiments of the present application, the support 3 may be of a unitary structure or of a split structure. Referring to fig. 39, when the bracket 3 is of an integrated structure, the escape hole 31 is formed in the form of a through hole penetrating the bracket 3. From this, the support 3 of integral type structure is convenient for process, and the reliability of support 3 is better to be convenient for support 3 and housing assembly 1 assembly, improve assembly efficiency and cooperation stability. It will be appreciated how the bracket 3 is fabricated may be specifically selected based on the material of the bracket 3. For example, when the bracket 3 is an insulating plastic member, the bracket 3 of an integral structure may be obtained by injection molding.

Referring to fig. 40, when the bracket 3 is in a split structure, the bracket 3 includes a first bracket 33 and a second bracket 34 that are detachable, and the first bracket 33 and the second bracket 34 are both in a strip-shaped structure, and can be detachably connected, for example, can be spliced or clamped to be matched, so as to facilitate assembly. Meanwhile, one side of the first support 33, which is close to the second support 34, is provided with a half-hole structure, the other half-hole structure with shape adaptation is correspondingly arranged on the second support 34, which is close to the first support 33, and the half-hole structure of the first support 33 and the half-hole structure of the second support 34 jointly enclose an annular avoidance hole 31. That is, the first bracket 33 and the second bracket 34 define the escape hole 31 therebetween.

In the above technical scheme, the avoidance hole 31 is defined by the cooperation of the first bracket 33 and the second bracket 34, when the bracket 3 is assembled with the battery cell assembly 2, the conductive part 22 does not need to be penetrated from one end to the other end of the avoidance hole 31, but the conductive part 22 can be clamped by the first bracket 33 and the second bracket 34 at the position of the conductive part 22, so that the avoidance hole 31 surrounds the conductive part 22, thereby being convenient for the assembly of the bracket 3 and the battery cell assembly 2 and improving the assembly efficiency.

Alternatively, when the cross section of the avoidance hole 31 is elongated, the first support 33 and the second support 34 are disposed on two sides of the width direction of the avoidance hole 31, for example, the width direction of the avoidance hole 31 is left and right, and the first support 33 and the second support 34 are located on the left and right sides of the avoidance hole 31, so that the first support 33, the second support 34 and the conductive portion 22 are conveniently matched.

In the embodiment of the present application, referring to fig. 36, 41 and 42, the configuration of the bracket 3 is not limited thereto, and the edge of the bracket 3 facing away from the housing cover 112 may be further provided with a housing-in guide surface 35, and the housing-in guide surface 35 includes an inclined surface or a curved surface and is orthographically projected in the axial direction R of the first pole 12, the orthographic projection of the active material coating portion 21 is entirely located within the orthographic projection range of the bracket 3, and the orthographic projection range of the bracket 3 exceeds the orthographic projection range of the active material coating portion 21. The shell-entering guide surface 35 can play a guiding role, so that the support 3 can be smoothly installed in the shell 111, the support 3 firstly enters the shell 111 and the active substance coating part 21 and then enters the shell 111, and the problem that the shell 111 scratches the active substance coating part 21 is reduced. During assembly, the support 3 and the battery cell assembly 2 can be preassembled together, the preassembled assembly is assembled into the shell 11, and when the preassembled assembly is assembled, the support 3 is positioned at the front end of the active material coating part 21, namely, the support 3 enters the shell 11 relative to the active material coating part 21, so that the difficulty of the support 3 entering the shell 11 can be reduced by using the shell entering guide surface 35, the active material coating part 21 is protected by using the relatively larger projection area of the support 3, the probability of scraping and damaging the active material coating part 21 and the shell 11 is reduced, and the assembly efficiency and the success rate are improved. Further, the contact area of the stent 3 and the active material coated portion 21 can be increased, the problem of stress concentration can be reduced, and other structural members can be omitted.

Referring to fig. 41, in some embodiments of the present application, the battery cell 10 may further include an inner insulator 4, the inner insulator 4 is located inside the case 11 and wrapped outside the active material coating portion 21, and the inner insulator 4 is connected with the holder 3. In the above embodiment, on the one hand, by wrapping the inner insulator 4 around the active material coating portion 21, the insulation reliability between the active material coating portion 21 and the case 11 can be improved, the occurrence of corrosion of the case 11 due to contact of the active material coating portion 21 with the case 11 can be reduced or prevented, and the leakage problem of the electrolyte due to corrosion of the case 11 can be reduced, thereby improving the reliability of the battery cell 10; on the other hand, by connecting the inner insulator 4 to the bracket 3, the difficulty in fixing the inner insulator 4 can be reduced, and the reliability of the inner insulator 4 being wrapped around the active material coating portion 21 can be improved.

Referring to fig. 41, in the embodiment of the present application, the bracket 3 includes a body portion 36 and an extension portion 37, the body portion 36 is located on a side of the active material coating portion 21 near the first pole 12, the extension portion 37 is connected to the body portion 36 and located in an outer peripheral region of the active material coating portion 21, the extension portion 37 can be used for limiting and matching the active material coating portion 21 on one hand, the problem that the carbon powder falling off from an edge of the active material coating portion 21 and the shell 11 overlap and corrode is solved by using the extension portion 37, and the extension portion 37 can be used for fixing the inner insulating member 4 on the other hand, so that connection reliability between the inner insulating member 4 and the bracket 3 is improved, and a better insulating effect is achieved.

Illustratively, with reference to fig. 41, the body portion 36 and the extension portion 37 may define a positioning groove 39 on a side of the extension portion 37 remote from the active material application portion 21, and an end portion of the inner insulator 4 is embedded in the positioning groove 39 to avoid the inner insulator 4 protruding from an edge of the body portion 36, so that the body portion 36 may be used to protect the inner insulator 4 from scratch damage to the housing 11 during the insertion of the shell.

Specifically, in connection with fig. 42, the inner insulator 4 may be an integral film having a main body portion 41 located at both sides in the thickness direction of the active material application portion 21 and a connection portion 42 connecting the two main body portions 41, the connection portion 42 being located at one side of the active material application portion 21 away from the first pole 12, and an edge of one side of the main body portion 41 away from the connection portion 42 extending to the extension portion 37 and being connected with the extension portion 37, thereby having a superior insulating property and facilitating connection.

In some embodiments, the housing assembly 1 includes at least one first pole 12 riveted to the housing body 111.

In the above technical solution, since the first pole 12 is connected with the housing 111 in a riveting manner, when the housing 111 is thinned, the first pole 12 is not easy to be welded, and the first pole 12 is easy to be riveted on the housing 111, that is, the first pole 12 and the housing 111 are connected and installed in a riveting manner, the operation is convenient, and the first pole 12 is riveted on the housing 111 to facilitate the thinning design and the light weight of the housing 111, so as to reduce the weight of the battery cell 10. When the size of the battery cell 10 is fixed, the first pole 12 is used to conveniently thin the housing 111 in a riveting manner, which is also beneficial to increasing the internal space of the housing 111 and improving the energy density of the battery cell 10.

For example, in some embodiments, referring to fig. 43-45, the first pole 12 may be integrally formed and riveted to the housing 11, so that the assembly efficiency of the first pole 12 may be improved, the height of the first pole 12 protruding from the surface of the housing 11 may be reduced, which is beneficial for improving the energy density and improving the compactness.

Specifically, referring to fig. 43-45, before being rivetless, the first pole 12 may include a stop portion 1281 and a penetrating portion 1282, when assembled, the stop portion 1281 is stopped inside the housing 11, the penetrating portion 1282 is penetrated through the mounting hole 113, then, a portion of the penetrating portion 1282 located outside the housing 11 is swaged to form a flanging portion 1283, and the flanging portion 1283 is stopped outside the housing 11, thereby realizing the mounting of the first pole 12. At this time, the penetrating portion 1282 is a pole body of the first pole 12, the flanging portion 1283 is a first limiting stand of the first pole 12, and the stopping portion 1281 is a second limiting stand of the first pole 12.

Optionally, in conjunction with fig. 43 and 44, the housing assembly 1 may include several gaskets fitted between the housing 11 and the first pole 12, such as the first gasket 191 and the second gasket 192 shown in fig. 43, etc., and the gaskets are assembled in place before riveting, and after the first pole 12 is riveted, the first pole 12 compresses the gaskets to form a seal, so that the sealing property of the fitting position of the first pole 12 and the housing 11 may be improved by using the gaskets. The number, position and material of the sealing pad are not limited, and for example, the material may be silica gel, plastic, etc., which is not limited herein.

Alternatively, in connection with fig. 44, the length c of the burring 1283 may be greater than or equal to 1mm and the thickness d may be greater than or equal to 2mm to improve the caulking strength of the first pole 12. When the length c of the burring 1283 is less than 1mm and/or the thickness d is less than 2mm, the reliability of the first pole 12 and the housing 11 is reduced under relatively strong vibration.

For another example, in other embodiments of the present application, referring to fig. 9 and 10, the first pole 12 may be a split structure and welded to be mounted to the housing 11. For example, the first pole 12 may include a first portion 1291 and a second portion 1292, at least a portion of the first portion 1291 being stopped outside the housing 11 and at least a portion of the second portion 1292 being stopped inside the housing 11, and at least one of the first portion 1291 and the second portion 1292 being inserted through the mounting hole 113 and being welded (e.g., laser welded) to the other.

In some alternative embodiments, referring to fig. 48 and 49, the first pole 12 is provided in plurality and is located on the same side surface of the housing 11, thereby facilitating installation and improving assembly efficiency.

It should be noted that, the arrangement manner of the plurality of first pole pieces 12 on the same side surface is not limited, for example, when the cross section of the first pole pieces 12 is an elongated structure, for example, the cross section width of the cross section length is greater than or equal to three times, for example, an ellipse, an oblong or a rectangle, etc., and the first pole pieces 12 have better adaptability to the Bao Bian-shaped housing 11. For example, the plurality of first poles 12 are each provided on one side surface (denoted as a first wall surface 110) in the height direction of the housing 11, the length direction of each first pole 12 coincides with the length direction of the first wall surface 110 of the housing 11, and the plurality of first poles 12 are spaced apart in the length direction and/or the width direction of the first wall surface 110.

For example, in the example shown in fig. 48, when the first wall 110 has two first poles 12, the two first poles 12 are spaced apart along the length direction of the first wall 110. Alternatively, referring to fig. 48, a portion of the first pole 12 located outside the housing 11 (denoted as a pole outer portion) is annular, an inner ring length a1 of the pole outer portion is greater than or equal to 1/3 of a length a0 of the first wall 110 in a length direction of the first wall 110, and an inner ring width b1 of the pole outer portion is greater than or equal to 3/4 of a width b0 of the first wall 110 in a width direction of the first wall 110. Thus, the first pole 12 is advantageously provided with a larger area for electrical connection with the current collecting member, so as to further enhance the overcurrent capability of the first pole 12. Illustratively, the pole outer inner ring length a1 is greater than or equal to 50mm and the pole outer inner ring width b1 is greater than or equal to 30mm.

In addition, when the first wall 110 has two first poles 12, and the two first poles 12 are spaced apart along the length direction of the first wall 110, in some alternative embodiments, the first poles 12 include portions (denoted as pole interiors) located within the housing 11 that have a length greater than or equal to 1/3 of the length of the first wall 110 in the length direction of the first wall 110, and a width greater than or equal to 3/4 of the width of the first wall 110 in the width direction of the first wall 110, in conjunction with fig. 48. Thus, the first pole 12 can provide a larger area for electrical connection with the conductive portion 22, so as to further enhance the overcurrent capability of the first pole 12. Illustratively, the length of the pole interior is greater than or equal to 50mm and the width of the pole interior is greater than or equal to 30mm.

Also for example, in the example shown in fig. 49, when the first wall 110 has four first poles 12, two of the first poles 12 are spaced apart in the width direction of the first wall 110 to form one group, and a total of two groups are spaced apart in the length direction of the first wall 110. Alternatively, in connection with fig. 49, a portion of the first pole 12 located outside the housing 11 (denoted as a pole outer portion) is annular, an inner ring length a2 of the pole outer portion is greater than or equal to 1/3 of a length a0 of the first wall 110 in a length direction of the first wall 110, and an inner ring width b2 of the pole outer portion is greater than or equal to 1/5 of a width b0 of the first wall 110 in a width direction of the first wall 110. Thus, the first pole 12 is advantageously provided with a larger area for electrical connection with the current collecting member, so as to further enhance the overcurrent capability of the first pole 12. Illustratively, the pole outer inner ring length a2 is greater than or equal to 50mm and the pole outer inner ring width b2 is greater than or equal to 8mm.

In addition, when the first wall 110 has four first poles 12, of which two first poles 12 are spaced apart in the width direction of the first wall 110 to form one group, and two groups in total are spaced apart in the length direction of the first wall 110, in some alternative embodiments, the first pole 12 includes a portion (denoted as a pole interior) located within the housing 11 in the length direction of the first wall 110, the length of the pole interior being greater than or equal to 1/3 of the length of the first wall 110, and the width of the pole interior in the width direction of the first wall 110 being greater than or equal to 1/5 of the width of the first wall 110. Thus, the first pole 12 can provide a larger area for electrical connection with the conductive portion 22, so as to further enhance the overcurrent capability of the first pole 12. Illustratively, the length of the pole interior is greater than or equal to 50mm and the width of the pole interior is greater than or equal to 8mm.

In some embodiments, referring to fig. 48 and 49, a portion of the first pole 12 is located inside the housing 11, a portion of the first pole 12 is located outside the housing 11, and an orthographic projection area of the portion of the first pole 12 located outside the housing 11 on the first wall 110 is greater than or equal to 5% of an area of the first wall 110, for example, an orthographic projection area of the portion of the first pole 12 located outside the housing 11 on the first wall 110 is greater than or equal to 5%, 6%, 7%, 8%, 9%, 10%, etc. of the area of the first wall 110. Therefore, the connection area of the first pole 12 and the converging component is favorably improved, the effective overcurrent area between the first pole 12 and the converging component is promoted, and the charging speed of the battery cell 10 is favorably improved.

Further, in some embodiments, in conjunction with fig. 50, the portion of the first pole 12 protruding from the outer surface of the first wall 110 (denoted as the pole exterior) may have a vertical height t1 from the first wall 110 of less than or equal to 3.2mm, and the portion of the first pole 12 protruding from the inner surface of the first wall 110 (denoted as the pole interior) may have a vertical height t2 from the first wall 110 of less than or equal to 2mm in order to increase the volumetric energy density of the battery cell 10.

Referring to fig. 50 to 56 again, the housing 11 specifically includes a housing body 111 and a housing cover 112, the housing body 111 has a square annular structure, one or both ends of which are open, when one end of the housing body is open, the number of the housing covers 112 is one, the housing covers are disposed at the open position, and when both ends of the housing body are open, the number of the housing covers 112 is two, and the housing covers are disposed at the open ends of the housing body 111 respectively.

In detail, when the housing 11 includes the housing body 111 and the housing cover 112, and one end of the housing body 111 is open, the housing body 111 is an integrally formed piece, specifically may be a square structure formed by stretching, and at this time, the first pole 12 may be disposed on at least one of the housing body 111 or the housing cover 112. For example, in connection with fig. 51, the first pole 12 may be specifically disposed at an end of the housing 111 away from the housing cover 112. When the battery cell 10 is used in a vibration environment, the amplitude of the connection between the housing body 111 and the housing cover 112 is small, and the connection between the housing body 111 and the housing cover 112 is not prone to cracking, so that the reliability of the battery cell 10 can be improved, the wall thickness of the housing body 111 can be reduced, the cost can be reduced, the weight can be reduced, and the miniaturization of the battery cell 10 can be realized.

As an alternative, please refer to fig. 51 again, when the number of the first poles 12 is plural, all the first poles 12 are disposed at one end of the housing 111 away from the housing cover 112. Therefore, when the battery cell 10 is used in a vibration environment, the amplitude of the connection between the shell 111 and the shell cover 112 is small, the connection position between the shell 111 and the shell cover 112 is not easy to crack, and the reliability of the battery cell 10 can be improved. Also, the wall thickness e1 of the end wall of the case body 111 at the end far from the case cover 112 may be thinned to be less than or equal to 2mm, and the wall thickness e2 of the case body 111 connecting the end wall and the side wall of the case cover 112 may be thinned to be less than or equal to 0.8mm, so that the cost and weight may be reduced, and the miniaturization of the battery cell 10 may be facilitated.

When the first receiving groove 12110 provided corresponding to the mounting hole 113 is formed in the first pole 12, the wall thickness of the portion of the first pole 12 located on the side of the first receiving groove 12110 remote from the active material application portion 21 is made thinner, and thus the welding of the conductive portion 22 and the first pole 12 can be achieved from the outside of the housing 11, as shown in fig. 51, in the case where the housing 11 includes the housing body 111 and the cover 112, and the cover 112 is provided at the open end of the housing body 111, even if the first pole 12 is provided at the closed end of the housing body 111, there is no fear that it is difficult to weld the conductive portion 22 and the first pole 12 from the inside of the housing 11, because the welding of the conductive portion 22 and the first pole 12 can be performed from the outside of the housing 11, and thus the connection stability and reliability of the housing body 111 and the cover 112 can be improved by providing the first pole 12 at the closed end of the housing body 111.

When the second accommodation groove 12120 is formed in the first pole 12, the conductive portion 22 and the first pole 12 can be welded from the outside of the housing 11 through the notch of the second accommodation groove 12120, and as shown in fig. 51, in the case where the housing 11 includes the housing 111 and the cover 112, the cover 112 is provided at the open end of the housing 111, and even if the first pole 12 is provided at the closed end of the housing 111, there is no fear that it is difficult to weld the conductive portion 22 and the first pole 12 from the inside of the housing 11, because the conductive portion 22 and the first pole 12 can be welded from the outside of the housing 11, the connection stability and reliability of the housing 111 and the cover 112 can be improved by providing the first pole 12 at the closed end of the housing 111.

Of course, in other embodiments of the present application, all the first poles 12 may be disposed on the housing cover 112 according to the requirement, in conjunction with fig. 52. Thus, the first pole 12 is conveniently assembled with the housing cover 112, and the present embodiment is not limited thereto.

Referring again to fig. 6-8, 21, and 26-27, a battery cell 10 according to an embodiment of the application will be described.

Referring to fig. 6 to 8, the battery cell 10 has a rectangular parallelepiped shape, the height direction of the battery cell 10 is the first direction Z, the length direction of the battery cell 10 is the second direction X, and the thickness direction of the battery cell 10 is the third direction Y. The battery cell 10 includes a housing 11, the housing 11 includes a housing body 111 and a housing cover 112, the housing body 111 is of a square annular structure, one end of the housing body 111 along a first direction Z is open, the other end along the first direction Z is closed, and the housing cover 112 covers the open position of the housing body 111.

Referring to fig. 6 to 8, the closed end of the can 111 in the first direction Z is provided with two poles spaced apart in the second direction X to be positive and negative poles, respectively. The two poles are the first pole 12 provided with the accommodating part 121, the accommodating part 121 comprises a second accommodating groove 12120, specifically, the first pole 12 comprises a second end wall 12121 and a second side wall 12123, the second end wall 12121 is located on one side of the second side wall 12123, which is close to the shell cover 112, the second accommodating groove 12120 is formed by surrounding the second end wall 12121 and the second side wall 12123, the surface of one side, away from the shell cover 112, of the first pole 12 is a pole outer end face 123, a notch of the second accommodating groove 12120 is formed on the pole outer end face 123, and a first perforation 12130 is formed in the second end wall 12121.

Referring to fig. 8 and 21, the battery cell 10 further includes a cell assembly 2, the cell assembly 2 including an active material coating portion 21 and tab portions 221, the active material coating portion 21 being received in the case 11, the tab portions 221 extending into the second receiving grooves 12120 through the first through holes 12130 and being welded to the second end wall 12121 to electrically connect the active material coating portion 21 and the first tab 12 through the tab portions 221.

Referring to fig. 21, 26 and 27, a first cover plate 13 is embedded at the notch of the second receiving groove 12120 to close the notch of the second receiving groove 12120 by the cooperation of the first cover plate 13 and the first pole 12 after the welding of the tab portion 221 and the second end wall 12121 is completed. The first cover plate 13 is soldered to the first pole 12 to form an electrical connection. Thereafter, when the electrical connection of the battery cell 10 to the battery cell 10 is performed using the bus bar member, the bus bar member may be welded to the first cap plate 13 to achieve the electrical connection with the first pole 12.

In the above-mentioned technical solution, on the one hand, the first pole 12 is provided with the second accommodation groove 12120, which can reduce the weight of the first pole 12 to a certain extent, so as to improve the weight energy density of the battery cell 10 and the battery 100; on the other hand, since the notch of the second accommodation groove 12120 is formed on the pole outer end face 123, and the pole outer end face 123 is the surface of the first pole 12 on the side away from the active material coating portion 21, so that the second accommodation groove 12120 can be opened toward the direction away from the active material coating portion 21, when at least part of the tab portion 221 is accommodated in the second accommodation groove 12120, the accommodation and arrangement of the tab portion 221 can be easily achieved through the notch of the second accommodation groove 12120, and the welding operation of the tab portion 221 and the first pole 12 can be easily achieved through the notch of the second accommodation groove 12120, and thus the production difficulty of the battery cell 10 can be reduced, and the production efficiency of the battery cell 10 can be improved.

Moreover, since the welding of the tab portion 221 and the first pole 12 can be achieved from the outside of the housing 11, the first pole 12 can be provided on the closed end of the housing body 111, so that when the battery cell 10 is used in a vibrating environment, the amplitude of the joint of the housing body 111 and the housing cover 112 is small, the joint of the housing body 111 and the housing cover 112 is not prone to cracking, the reliability of the battery cell 10 can be improved, and the wall thickness of the housing body 111 can be reduced, the cost can be reduced, the weight can be reduced, and the miniaturization of the battery cell 10 can be achieved.

Referring to fig. 45 and 59, in some embodiments, the first pole 12 includes an integrally formed pole body, a first limiting table and a second limiting table, the pole body is disposed through the mounting hole 113, the first limiting table and the second limiting table are disposed at two ends of the pole body along an axial direction of the mounting hole 113, and the first limiting table is in a limiting fit with an outer side of the housing 111, and the second limiting table is in a limiting fit with an inner side of the housing 111, so that the first pole 12 is riveted to the housing 111.

It can be appreciated that the first limiting platform and the second limiting platform extend to the radial outer side of the peripheral wall of the mounting hole 113 along the radial direction of the mounting hole 113, the first limiting platform can limit the movement of the first pole 12 relative to the shell 111 in the direction facing the inner side of the shell 111, the second limiting platform can limit the movement of the first pole 12 relative to the shell 111 in the direction facing the outer side of the shell 111, so that the first pole 12 is convenient to be reliably mounted at the mounting hole 113 through the first limiting platform and the second limiting platform, the riveting of the first pole 12 and the shell 111 is facilitated, the assembly of the first pole 12 and the shell 111 is facilitated, and other connection modes between the first pole 12 and the shell 111 can be omitted, namely, the reliable connection of the first pole 12 and the shell 111 is facilitated, the structure of the shell assembly 1 is facilitated, and the assembly procedure of the shell assembly 1 is simplified; meanwhile, the pole body of the first pole 12, the first limit table and the second limit table are integrally formed, so that parts and cost can be saved, the strength of the first pole 12 can be ensured, the first pole 12 and the shell 11 are not easy to separate from the shell 11 due to vibration or external pulling in the charging and discharging process of the battery cell 10 after being matched, and the stability and reliability of the battery cell 10 can be improved.

In some embodiments, in conjunction with fig. 60, the dimension of the first pole 12 in the first direction is greater than the dimension of the pole 12 in the second direction, the first direction and the second direction being perpendicular, both the first direction and the second direction being perpendicular to the axial direction of the mounting hole 113.

On a plane formed by the first direction and the second direction, the orthographic projection shape of the first pole 12 may be non-circular, which is favorable for making the first pole 12 well matched with the wall provided with the first pole 12 on the shell 111 in the first direction and the second direction, so that the cross-sectional area of the first pole 12, on which the wall of the shell 111 can be arranged, can be improved to a certain extent, the overcurrent area of the first pole 12 can be increased in the limited arrangement area on the wall, the overcurrent capacity of the first pole 12 can be improved, the heat diffusion capacity of the first pole 12 can be improved, and further, the charging speed of the battery cell 10 adopting the shell assembly 1 can be improved.

In some embodiments, the first direction is the length direction of the cross section of the first pole 12, and the second direction is the width direction of the cross section of the first pole 12, and the axial direction of the mounting hole 113 may refer to the height direction of the first pole 12 or the axial direction of the pole 12.

In some embodiments, in the cross section of the first pole 12, the dimension of the first pole 12 in the first direction is greater than three times the dimension of the first pole 12 in the second direction, and the first direction, the second direction and the axial direction of the mounting hole 113 are perpendicular to each other, which is beneficial to make good matching between the first pole 12 and the wall of the first pole 12 on the housing 111 in the first direction and the second direction, so that the first pole 12 fully utilizes the arrangement area of the wall of the first pole 12 on the housing 111, and increases the cross section area of the first pole 12, so that the first pole 12 is formed into a "super-large pole structure", which is beneficial to further increase the overcurrent area, overcurrent capacity and thermal diffusion capacity of the first pole 12.

In some embodiments of the application, referring to fig. 57, the housing 111 has oppositely disposed second and third wall portions 1113, 1114, each of the second and third wall portions 1113, 1114 being provided with at least one first pole 12.

The "second wall portion 1113 and the third wall portion 1114" may refer to end walls of the case 111 that are located at both sides of the third direction and extend in the first direction (see fig. 57), or may refer to end walls of the case 111 that are located at both sides of the third direction and extend in the second direction. Next, one first pole 12 may be provided on the second wall 1113 and the third wall 1114, or a plurality of first poles 12 may be provided.

That is, the first electrode 12 may be disposed on two opposite sides of the housing 111 (referring to fig. 53-55), when the first electrode 12 is disposed on two opposite sides of the housing 111, the conductive portion 22 may extend from the active material coating portion 21 near the first electrode 12 on each side, and the conductive portion 22 is cooperatively connected with the first electrode 12 on the adjacent side, so that the problem that the tab portion 221 is pulled by the first electrode 12 on the same side, resulting in the connection between the tab portion 221 and the active material coating portion 21 being cracked, and the reliability of the battery cell 10 is improved. Note that the first poles 12 on both sides may be identical or different, and the connection manner between the first poles 12 on both sides and the conductive portion 22 may be identical or different, which is not limited herein.

Referring to fig. 58, in some embodiments, the housing 111 has a plurality of walls 1115, a portion of the walls 1115 is a first set wall 1116, an area of the first set wall 1116 is larger than an area of the remaining walls 1115, and the first pole 12 is disposed on the first set wall 1116.

The "first setting wall 1116" may refer to the largest area among the plurality of wall sections 1115. That is, since the first pole 12 is riveted to the largest wall portion of the case 111 and the area of the wall portion 1115 connected to the first pole 12 is largest, the first pole 12 is easier to be operated during the riveting, the assembly efficiency can be improved, and the yield of the battery cell 10 can be improved.

Also for example, in some alternative embodiments of the application, the first pole 12 may be located on the top surface of the housing 111, and so on. Wherein, when the first pole 12 is located on the top surface of the housing 111, the containing portion 121 can be used to contain the electrolyte, so as to improve the cycle life of the battery cell 10. In addition, when the first pole 12 is located on the top surface of the housing 111 and the bracket 3 is located at the bottom of the active material coating portion 21, the contact area between the bracket 3 and the active material coating portion 21 can be increased, the problem of stress concentration can be reduced, and other supporting structural members can be omitted.

In some embodiments, the housing 111 has a plurality of walls 1115, at least one of the walls 1115 is a second set wall, the pressure relief portion 16 is disposed on the second set wall, and the first pole 12 is disposed on the remaining walls 1115 except for the second set wall.

The specific configuration of the pressure release portion 16 is not limited, and may be, for example, an explosion-proof valve or a weak portion, etc., and may be used to release pressure when the pressure in the battery cell 10 is large, thereby improving the reliability of the battery cell 10.

The first pole 12 and the pressure relief portion 16 are provided on different wall portions 1115, and when the battery cell 10 is thermally out of control, the discharged high-temperature medium is discharged through the pressure relief portion 16 and then is not contacted with the first pole 12, so that the probability of ignition caused by contact of the high-temperature medium in the circuit in the battery can be reduced.

For example, the plurality of wall parts 1115 may refer to an upper wall part, a left wall part, a right wall part, a front wall part, and a rear wall part of the housing 111. The second setting wall portion may be referred to as an upper wall portion, and the first pole 12 may be provided on one or more of the left wall portion, the right wall portion, the front wall portion, and the rear wall portion, and similarly, the second setting wall portion 1117 may be referred to as one of the left wall portion, the right wall portion, the front wall portion, and the rear wall portion, and the first pole 12 may be provided on the other wall portion 1115. Referring to fig. 56, in some embodiments of the present application, the pressure relief portion 16 is disposed on the housing cover 112, and the pressure relief portion 16 and the housing cover 112 are integrally formed.

In the above scheme, the number of parts of the battery cell 10 can be reduced by integrally forming the pressure relief portion 16 and the casing cover 112, so that the welding step between the pressure relief portion 16 and the casing body 111 is reduced, that is, the step of connecting the pressure relief portion 16 after or before the casing cover 112 is connected with the casing body 111 is omitted, thus improving the assembly efficiency of the battery cell 10, reducing the cost of the welding process, reducing the possibility of failure of the welding position, and improving the reliability of the battery cell 10.

Alternatively, the pressure release portion 16 and the casing cover 112 are integrally formed, that is, the pressure release portion 16 is a weak component on the casing cover 112, and the weak component can be cracked and released under a certain pressure, so that deformation is not easy to occur in the process of forming the pressure release portion 16 by adopting the pressure release portion 16 on the casing cover 112, the forming process of the casing cover 112 is relatively simple, the rate of the single battery 10 can be improved, and the cost is reduced.

Referring to fig. 4 and 59, in some embodiments, the housing 111 has a plurality of walls 1111, at least one of the plurality of walls 1111 is a first wall 1112, the first pole 12 is riveted to the first wall 1112, and the thickness of the first wall 1112 is greater than the thickness of the remaining walls 1111.

The thickness of the first wall portion 1112 is larger than that of the remaining wall portions 1111 as the case wall connecting the first pole 12, so that the strength of the entire case 111 can be improved due to the relatively large thickness of the first wall portion 1112, and the reliability of the battery cell 10 in daily use can be improved. On the other hand, since the thickness of the first wall portion 1112 is relatively large, the reliability at the time of caulking the first pole 12 can be improved, and the yield of the battery cell 10 can be improved.

On the premise of meeting the riveting reliability of the first pole 12, the thickness of the first wall portion 1112 can be a conventional wall thickness, and the wall thicknesses of the remaining wall portions 1111 are reduced, so that the space inside the casing 111 can be increased under the condition that the outer contour size of the casing 111 is fixed, and further, the active material coating portion 21 with a larger size can be placed, which is beneficial to improving the energy density of the battery cell 10.

In some embodiments of the application, referring to fig. 3, the pressure relief portion 16 is provided on the first wall portion 1112. That is, the pressure relief portion 16 and the first pole 12 may be located on the same side surface of the housing 111. Thereby facilitating processing and assembly. Or alternatively, the pressure relief portion 16 and the first pole 12 may be disposed on opposite side surfaces of the housing 111. Therefore, the space can be saved, the volume of the first pole 12 can be increased, and the adverse effect on the first pole 12 caused by pressure relief of the pressure relief part 16 can be reduced.

Referring to fig. 51 and 56, in some embodiments of the present application, the housing 111 has a pressure relief portion 16, and the pressure relief portion 16 is disposed on the housing cover 112. Therefore, the pressure relief portion 16 is convenient to process, and the pressure relief reliability of the pressure relief portion 16 is good. It should be noted that, in the present embodiment, the first pole 12 may be provided on the housing body 111 or the housing cover 112, which is not limited herein. For example, the pressure release portion 16 may be integrally formed with the cover 112, thereby facilitating ease of manufacture, simplifying assembly, improving production efficiency, and reducing cost.

In some embodiments, the ratio of the thickness of any of the first wall portion 1112 and the remaining wall portion 1111 is d1, where 1 < d1.ltoreq.7.5.

If d1 is smaller than 1, the thickness of the first wall 1112 cannot be larger than the thickness of the remaining wall 1111, and the supporting strength of the first tab 12 cannot be improved, and if d1 is larger than 7.5, the ratio of the thickness of the first wall 1112 to the thickness of the remaining wall 1111 is larger, resulting in the thickness of all the wall 1111 being larger, and the thickness of the first wall 1112 is too large, which is disadvantageous in that the strength requirement is satisfied, but the weight of the battery cell 10 is reduced, so that the value of d1 is at most 7.5. For example, d1 may be 1.2, 1.4, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, etc.

In some embodiments, 1 < d1.ltoreq.2.5. As described above, considering how to raise the space in the case on the premise that the thickness of the case 111 is thin and the outer dimension of the case 1111 is fixed, the d1 is greater than 2.5, while the case 111 is guaranteed to have better strength as a whole, the space in the case is sacrificed, which is unfavorable for raising the energy density of the battery cell 10, so that the strength of the case 111 can be considered by setting d1 to be greater than 1 and less than or equal to 2.5, and meanwhile, on the premise that the outer dimension of the case 111 is fixed, a larger space can be provided in the case 111, which is favorable for increasing the dimension of the active material coating portion 21 and raising the energy density of the battery cell 10.

In some embodiments, as shown in fig. 51 and 59, the thickness of the first wall portion 1112 is e1, wherein 1.5 mm.ltoreq.e1.ltoreq.2.5 mm, and/or the thickness of the remaining wall portions 1111 other than the first wall portion 1112 is e2, wherein 0.3 mm.ltoreq.e2.ltoreq.0.6 mm.

In the case where the thickness of the first wall portion 1112 is greater than the thickness of the remaining wall portions 1111, the thickness e1 of the first wall portion 1112 may be 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, and the like. That is, if e1 is less than 1.5mm, the thickness of the first wall portion 1112 is relatively small, and the strength is insufficient, which is not conducive to riveting the first pole 12; if e1 is greater than 2.5mm, the thickness of the first wall portion 1112 is excessively large, the case 111 is relatively thick, resulting in an increase in cost, and in the case where the outer contour size of the case 111 is fixed, the space within the case 111 is reduced, thereby resulting in a relatively small size of the active material coating portion 21, and reducing the energy density of the battery cell 10.

Alternatively, in the case where the thickness of the first wall portion 1112 is greater than the thickness of the remaining wall portion 1111, the thickness e2 of the remaining wall portion 1111 other than the first wall portion 1112 may be 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, or the like. It is understood that if e2 is less than 0.3mm, the thickness of the remaining wall portion 1111 other than the first wall portion 1112 is relatively small, and even if the first wall portion 1112 has relatively good strength, the remaining wall portion 1111 has insufficient strength, which may result in insufficient strength of the housing 111 and is easily damaged; if e2 is greater than 0.6mm, the thickness of the wall 1111 other than the first wall 1112 is relatively large, and although strength can be ensured, the cost is increased, and when the outer contour dimension of the case 111 is fixed, the space in the case 111 is reduced, and further the size of the active material coating portion 21 is reduced, and the energy density of the battery cell 10 is reduced.

Of course, in the case where the thickness of the first wall portion 1112 is greater than the thickness of the remaining wall portion 1111, it may be satisfied at the same time that: the thickness of the first wall portion 1112 is e1, wherein 1.5 mm.ltoreq.e1.ltoreq.2.5 mm, and the thickness of the remaining wall portions 1111 other than the first wall portion 1112 is e2, wherein 0.3 mm.ltoreq.e2.ltoreq.0.6 mm.

In some embodiments, 1.8 mm.ltoreq.e1.ltoreq.2.2 mm. In particular, e1 may be 1.8mm, 1.85mm, 1.9mm, 1.95mm, 2.0mm, 2.1mm, 2.2mm, etc. The value of e1 should satisfy a certain safety margin, if e1 is smaller than 1.8mm, the first wall 1112 can satisfy the strength requirement, but the thickness of the first wall 1112 is smaller, resulting in increased processing or technological cost, and the first wall 1112 is more easily damaged under the limit working condition; if e1 is greater than 2.2mm, the first wall portion 1112 is made of a relatively large amount of material, which increases the cost, and the case 111 has a relatively small inner space when the outer contour dimension of the case 111 is fixed, which reduces the size of the active material coating portion 21 and reduces the energy density of the battery cell 10.

In some embodiments, 0.4 mm.ltoreq.e2.ltoreq.0.55 mm. In particular, e2 may be 0.4mm, 0.42mm, 0.44mm, 0.46mm, 0.48mm, 0.5mm, 0.52mm, 0.55mm, etc. The value of e2 should satisfy a certain safety margin, and if e2 is less than 0.4mm, although the remaining wall 1111 except the first wall 1112 can satisfy the strength requirement, the thickness of the remaining wall 1111 is smaller, resulting in an increase in processing or process cost, and the remaining wall 1111 is more easily damaged under the limit condition; if e2 is greater than 0.55mm, the remaining wall 1111 is increased in material consumption when the strength requirement is satisfied, resulting in an increase in cost, and the inner space of the case 111 is reduced when the outer contour size of the case 111 is fixed, thereby reducing the size of the active material coating portion 21 and reducing the energy density of the battery cell 10.

In some embodiments, the thickness of the cover 112 is less than the thickness of the first wall portion 1112. Because the first pole 12 is riveted to the first wall portion 1112, and the casing cover 112 is not connected to the first pole 12, the strength requirement of the casing cover 112 is relatively low, and the thickness of the casing cover 112 can be smaller than that of the first wall portion 1112, so that materials can be saved, and under the condition that the outer contour size of the casing 11 is fixed, the space in the casing 11 can be increased because the thickness of the casing cover 112 is relatively small, and at this time, the casing 11 can be provided with the active material coating portion 21 with a larger size, which is beneficial to improving the energy density of the battery cell 10.

In some embodiments, the thickness of the cover 112 is greater than the thickness of the remaining wall 1111, except the first wall 1112 and adjacent to the cover 112.

For example, the cover 112 may be welded to the housing body 111, and in this embodiment, the thickness of the cover 112 may be greater than the thickness of the wall 1111 welded to the cover 112. In view of the fact that the cover 112 is to be sealed on the opening 111a, it is necessary to provide a suitable strength, and therefore, by setting the thickness of the cover 112 to be greater than the thickness of the remaining wall portion 1111 other than the first wall portion 1112 and adjacent to the cover 112, it is possible to make the overall strength of the case 11 relatively good after the cover 112 is sealed on the opening 111a, it is possible to reduce the probability of damage of the case 11, and to improve the reliability of the battery cell 10.

It should be noted that, the thickness of the first wall portion 1112 may refer to an average thickness of the main structure of the first wall portion 1112, for example, the first wall portion 1112 may be stepped and have a plurality of different thickness regions, and in this case, the thickness of the first wall portion 1112 may refer to a thickness of a region where the first pole 12 is riveted. Similarly, the thickness of the cover 112 may also refer to the average thickness of the main structure of the cover 112, and the thickness of the wall 1111 may refer to the average thickness of the main structure of the wall 1111.

In some embodiments, the thickness of the cover 112 is e3, where 1.0 mm.ltoreq.e3.ltoreq.1.5 mm, in conjunction with FIG. 5. That is, if e3 is less than 1.0mm, the thickness of the cover 112 is relatively small, and the strength is insufficient, resulting in that the strength of the housing 11 is not high, and the housing 11 is easily damaged; if e1 is greater than 1.5mm, the thickness of the cover 112 is too large, the case 111 is relatively thick, the material consumption increases, and thus the cost increases, and the space in the case 111 is relatively small in the case 111 with the outer contour size of the case 111 fixed, and thus the size of the active material coating portion 21 is reduced, and the energy density of the battery cell 10 is reduced.

In some embodiments, 1.2 mm.ltoreq.e3.ltoreq.1.4 mm. That is, if e3 is smaller than 1.2mm, the thickness of the cover 112 is smaller, and the thickness of the cover 112 can meet the strength requirement, but when the cover 112 is accidentally or for a long time operated, the probability of being damaged is relatively high, and meanwhile, too small the thickness of the cover 112 can result in relatively high requirements of the processing technology and increased cost; if e3 is greater than 1.4mm, the thickness of the cover 112 is greater in the case where the strength requirement is satisfied, the thickness of the cover 112 is greater, the material consumption is increased, the cost is also increased, and the inner space of the case 111 is smaller in the case where the outer contour size of the case 111 is fixed, thereby reducing the size of the active material coating portion 21 and reducing the energy density of the battery cell 10. The strength requirement and the volume ratio requirement can be considered by setting e3 in a range of 1.2mm or more and 1.4mm or less.

Referring to fig. 4 and 5, in some embodiments, an opening 111a is provided at the bottom of the housing 111.

In the related art, the opening of shell body sets up at the top, and the cap is installed on the opening at the top of shell body, and the processing chamfer is left to the bottom of the inner space of shell body of this kind of structure when processing, and when the active material coating portion was installed into the shell, because the existence of processing chamfer, the bottom of active material coating portion (can refer to the one end that keeps away from the conductive part of active material coating portion) and the inside processing chamfer of shell body were contactless, and both remain certain space, can set up the baffle in this space, separate active material coating portion and cap, this just leads to the waste of shell body inner space. In the structure of the shell 11, after the active material coating portion 21 is put into the shell, no processing chamfer exists between the bottom of the active material coating portion 21 and the shell cover 112, so that a partition plate can be omitted between the bottom of the active material coating portion 21 and the shell cover 112, the gap between the bottom of the active material coating portion 21 and the shell cover 112 can be reduced, the size of the active material coating portion 21 can be increased, and the energy density of the battery cell 10 can be improved. Secondly, since the active material coating portion 21 has no machined chamfer in the vicinity of the bottom thereof, the active material coating portion 21 is not damaged by contact with the machined chamfer, i.e., the probability of damage of the active material coating portion 21 can be reduced, the loss of the active material coating is reduced, the performance of the battery cell 10 can be improved, and the occurrence of stress concentration on the active material coating portion 21 can be reduced.

On the other hand, since the case cover 112 is disposed at the bottom of the case body 111, when the battery cell 10 is constituting the battery 100, the bottom of the case 11 is generally required to be fixed at the bottom of the case body 20 of the battery 100, in which case, when vibration occurs during use, the amplitude ratio received at the junction of the case cover 112 and the case body 111 is reduced because the case cover 112 is connected to the bottom of the case body 20, and the occurrence of cracking of the case cover 112 and the case body 111 can be further reduced.

Referring to fig. 5, in some embodiments, the active material coating portion 21 has a first end surface 21a adjacent to the cover 112, the battery cell 10 further includes an inner insulating member 4, the inner insulating member 4 surrounds the cell assembly 2, at least a portion of the inner insulating member 4 is disposed between the first end surface 21a and the cover 112, the inner insulating member 4 has opposite first and second surfaces 4a and 4b, the first surface 4a is in contact with the first end surface 21a, and the second surface 4b is in contact with the cover 112.

With reference to the description of the inner insulator 4 above, by the contact of the first surface 4a of the inner insulator 4 with the first end surface 21a and the contact of the second surface 4b with the cover 112, in the case where the insulating effect between the active material coating portion 21 and the cover 112 is satisfied, it is possible to omit the provision of a spacer between the active material coating portion and the cover, which is advantageous in saving the space in the case body 111, increasing the size of the active material coating portion 21, and further improving the energy density of the battery cell 10.

In some embodiments, as shown in FIG. 5, the portion of the inner insulator 4 between the first surface 4a and the second surface 4b has a thickness d2, wherein 0 < d 2.ltoreq.0.1 mm.

That is, d2 may be 0.01mm, 0.02mm, 0.03mm, 0.04mm, 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm, and the like. The thickness of the portion of the inner insulator 4 between the first surface 4a and the second surface 4b is greater than 0.1mm, and the thickness of the inner insulator 4 is relatively large while satisfying the insulation effect between the active material coated portion 21 and the cover 112, and occupies a space in the case 111, which is disadvantageous in increasing the size of the active material coated portion 21; and the thickness of the portion of the inner insulating member 4 between the first surface 4a and the second surface 4b is less than 0.1mm, which not only satisfies the insulation requirements of the active material coating portion 21 and the case cover 112, but also contributes to saving space, thereby contributing to increasing the size of the active material coating portion 21 and further improving the energy density of the battery cell 10.

In some embodiments, 0.02mm < d 2.ltoreq.0.05 mm. That is, d2 may be specifically 0.02mm, 0.025mm, 0.03mm, 0.035mm, 0.04mm, 0.045mm, 0.05mm, and the like.

In the above technical solution, the value of d2 should have a certain safety margin, that is, d2 needs to be selected in a proper range, if d2 is greater than 0.05mm, the insulation effect may exceed the requirement between the active material coating portion 21 and the cover 112, and the space in the housing 111 is wasted; if d2 is less than 0.02mm, the inner insulator 4 can also meet the insulation requirement between the active material coating portion 21 and the cover 112, but because the thickness is too small, the manufacturing process difficulty of the inner insulator 4 is increased, and further the cost is increased, the inner insulator is easy to damage in the mounting process, the assembly difficulty is increased, and the product quality is reduced, so that the insulation requirement between the active material coating portion 21 and the cover 112 can be met and the cost and the assembly difficulty can be met by setting d2 to be in the range of 0.02mm or more and 0.05mm or less.

In some embodiments, as shown in fig. 4, the housing body 111 has a first wall portion 1112 opposite the housing cover 112, and the first pole 12 is disposed on the first wall portion 1112.

In this technical solution, the battery cell assembly 2 can enter along the opening 111a, and the conductive portion 22 is directly opposite to the first pole 12, so that the conductive portion 22 can be easily connected with the first pole 12, and the assembly efficiency of the battery cell 10 is improved.

For example, the first wall portion 1112 and the case cover 112 may be disposed at both ends in the third direction in fig. 3, as in the previous embodiment, the opening 111a is provided at the bottom of the case body 111, the case cover 112 is provided at the bottom of the case body 111, and the battery cell assembly 2 can be mounted into the case body 111 from bottom to top in the third direction, so that the conductive portion 22 can be easily connected to the first terminal 12.

Referring to fig. 56, in some embodiments of the present application, a liquid storage groove 112a is provided on an end surface of the cover 112 near the inner side of the housing 111. The liquid storage tank 112a can be used for storing electrolyte, so that the electrolyte content in the battery cell 10 is increased, and the cycle life of the battery cell 10 can be further prolonged.

Referring to fig. 56, in some embodiments of the application, the reservoir 112a includes a first reservoir portion 1121, the first reservoir portion 1121 extending along the length of the housing cover 112. The extending direction of the first groove 1121 is aligned with the longitudinal direction of the cover 112, so that the volume of the first groove 1121 can be increased and more electrolyte can be stored.

Referring to fig. 56, in some embodiments of the present application, the liquid storage tank 112a further includes a second tank portion 1122, the second tank portion 1122 communicates with the first tank portion 1121, and the second tank portion 1122 extends along the width direction of the housing cover 112. Further, more electrolyte can be stored by adding the second groove 1122 on the basis that the first groove 1121 has been provided.

Referring to fig. 56, alternatively, the second groove portions 1122 are provided on both sides of the first groove portion 1121 in the longitudinal direction, and the capacity of the liquid storage groove 112a can be increased by increasing the number of the second groove portions 1122. For example, two second groove portions 1122 are provided on each side in the longitudinal direction of the first groove portion 1121. Of course, the number of the second groove portions 1122 is not limited thereto, and will not be described again.

Referring to fig. 56, in some embodiments of the application, the liquid storage tank 112a further includes a third tank portion 1123, and the third tank portion 1123 is located at both ends of the first tank portion 1121 and is directed toward a corner of the housing cover 112. The storage amount of the electrolyte can be further increased by adding the third groove 1123 in addition to the first groove 1121 and the second groove 1122.

Referring to fig. 56, alternatively, the first slot 1121 is provided with third slots 1123 on both sides in the longitudinal direction. The capacity of the reservoir 112a can be increased by increasing the number of the third groove portions 1123. For example, the third groove 1123 is provided in two on each side in the longitudinal direction of the first groove 1121. Of course, the number of the third groove portions 1123 is not limited thereto, and will not be described again.

Referring to fig. 5, in some embodiments of the present application, a protruding portion 112b is disposed on an end surface of the cover 112 near the inner side of the housing 111, and a circumferential end surface of the protruding portion 112b contacts with an inner side wall surface of the housing 111.

"boss 112b" may refer to a structure protruding from the cover 112, and boss 112b may include, but is not limited to, boss structures and annular race structures, as may be specifically provided as desired.

In the above scheme, the end face of the casing cover 112, which is close to the casing body 111, is in contact with the casing body 111, and the protruding portion 112b is embedded in the inner wall surface of the casing body 111, so that the connection between the casing cover 112 and the casing body 111 is tighter and more reliable, the connection between the casing cover 112 and the casing body 111 is firmer, and meanwhile, the thickness of the casing cover 112 is also reduced, the whole volume of the battery cell 10 is reduced, and the energy density of the battery is improved.

In some embodiments of the present application, the cover 112 is provided with a projection 112b in a partial region on the end face near the inside of the housing 111, and a liquid reservoir 112a in the remaining partial region. For example, the protruding portion 112b is rectangular ring-shaped, and the liquid storage groove 112a is located in the middle of the rectangular ring-shaped.

In some embodiments of the present application, the boss 112b may be configured in a flat plate shape with a step formed between the rim of the cover 112 and the rim of the cover 112, and the reservoir 112a is formed on the boss 112b (see fig. 56).

In some embodiments of the application, the cover 112 and the body 111 may be welded or adhesively attached.

According to some embodiments of the present application, the present application also provides a battery 100, wherein the battery 100 includes the battery cell 10 of any of the above embodiments.

In the above technical solution, in the battery 100, since the first poles 12 of any adjacent battery cells 10 are connected to each other, when the battery 100 vibrates or deforms, the first poles 12 between any adjacent battery cells 10 will pull each other, and at this time, since the first poles 12 are disposed on the housing 111, the force applied to the first poles 12 will be preferentially transmitted to the housing 111, and will not directly act on the housing cover 112; on one hand, the distance from the acting force to the connection position between the shell 111 and the shell cover 112 can be prolonged, on the other hand, the shell 111 can be deformed preferentially when stressed, so that the stress of the connection position between the shell 111 and the shell cover 112 is reduced, the probability of cracking between the shell 111 and the shell 112 in the use process of the battery 100 is effectively reduced, and the reliability of the battery cell 10 is improved.

According to some embodiments of the present application, the present application further provides an electric device 1000, where the electric device 1000 includes the battery cell 10 of any of the above embodiments; alternatively, battery 100 including any of the embodiments described above. The battery cell 10 or the battery 100 is used to supply electric power to the power consumption device 1000.

In the above technical solution, the above battery 100 or the battery cell 10 is adopted in the power consumption device 1000, so that the probability of cracking between the shell cover 112 and the shell body 111 of the battery cell 10 is relatively low in the use process, the reliability of the battery 100 is improved, and the performance of the power consumption device 1000 is improved.

It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other.

The above is only a preferred embodiment of the present application, and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A battery cell, comprising:

the shell assembly comprises a shell and a first pole, the shell comprises a shell body and a shell cover, the shell body is provided with an opening, the shell cover is covered on the opening, and the shell body is provided with the first pole;

the battery cell assembly comprises an active material coating part and a conductive part, wherein the active material coating part is accommodated in the shell, and the conductive part is electrically connected with the active material coating part and the first pole.

2. The battery cell of claim 1, wherein the first post is provided with a receiving portion, and at least a portion of the conductive portion is received in the receiving portion.

3. The battery cell according to claim 2, wherein the housing portion has a first housing groove, a surface of the first electrode on a side facing the active material application portion is an electrode inner end surface, a notch of the first housing groove is formed on the electrode inner end surface, and at least part of the conductive portion is housed in the first housing groove.

4. The battery cell of claim 3, wherein the housing has a mounting hole therein, the first post being mounted to the mounting hole; along the axial direction of the first pole, the depth H1 of the first accommodating groove is larger than or equal to the minimum distance H2 from the inner end surface of the pole to the mounting hole.

5. The battery cell according to claim 3 or 4, wherein the housing portion includes a first end wall and a first side wall, the first end wall is located on a side of the first side wall away from the active material coating portion, the first end wall and the first side wall are surrounded to form the first housing groove, and an electrical connection position of the conductive portion and the first terminal is located on the first end wall and/or the first side wall.

6. The battery cell of claim 5, wherein the first end wall has a first countersink thereon, and wherein at least a portion of the location at which the conductive portion is electrically connected to the first end wall is within the first countersink.

7. The battery cell according to claim 3, wherein the first electrode post has a first groove, a surface of the first electrode post on a side remote from the active material coating portion is an electrode post outer end face, and a notch of the first groove is formed on the electrode post outer end face.

8. The battery cell of claim 7, wherein the housing assembly further comprises a slot cover disposed on the first post and closing a notch of the first groove.

9. The battery cell according to claim 2, wherein the housing portion has a second housing groove, a surface of the first electrode on a side away from the active material coating portion is an outer end surface of the electrode, a notch of the second housing groove is formed on the outer end surface of the electrode, the second housing groove communicates with the inside of the case through a first through hole, and the conductive portion is provided through the first through hole and at least partially housed in the second housing groove.

10. The battery cell of claim 9, wherein the location of the electrical connection of the conductive portion to the first post is located on a wall of the first aperture formed by the receptacle.

11. The battery cell according to claim 9, wherein the accommodating portion includes a second end wall and a second side wall, the second end wall is located on a side of the second side wall, which is close to the active material coating portion, the second end wall and the second side wall enclose to form the second accommodating groove, the first through hole is formed in the second end wall, and an electrical connection position between the conductive portion and the first electrode post is located on the second end wall and/or the second side wall.

12. The battery cell of claim 11, wherein the second end wall has a second countersink thereon, and wherein at least a portion of the location at which the conductive portion is electrically connected to the second end wall is within the second countersink.

13. The battery cell as recited in claim 9, wherein the housing has a mounting hole, the first post is mounted to the mounting hole, and a depth H3 of the second receiving groove is greater than or equal to a minimum distance H4 from an outer end surface of the post to the mounting hole in an axial direction of the first post.

14. The battery cell of claim 9, wherein the housing assembly further comprises a first cover plate that mates with the first post and closes the slot of the second receiving slot, the first cover plate being electrically connected to the first post.

15. The battery cell of claim 14, wherein the first cover plate comprises a first conductive member and a second conductive member that are different in material, the first conductive member is mated and electrically connected with the first pole, and the second conductive member is mated and electrically connected with the first conductive member.

16. The battery cell as recited in claim 15, wherein the first conductive member has a second groove formed therein, and the second conductive member is embedded in the second groove, and a notch of the second groove is formed on a surface of the first conductive member on a side away from the second receiving groove so that the second conductive member is exposed from the notch of the second groove.

17. The battery cell of claim 14, wherein the first cover plate is embedded at a notch of the second receiving groove.

18. The battery cell of claim 17, wherein the wall of the first post at which the slot of the second receiving slot is formed is a guide slope for guiding the first cover plate to mate with the slot of the second receiving slot.

19. The battery cell of claim 17 or 18, wherein the second receiving groove comprises a first groove section and a second groove section positioned at a side of the first groove section near the outer end surface of the pole, the cross-sectional area of the second groove section is larger than that of the first groove section to form a step surface between the first groove section and the second groove section, and the first cover plate is embedded in the second groove section and supported on the step surface.

20. The battery cell according to claim 2, wherein the first electrode includes a first electrode portion and a second electrode portion which are different in material and electrically connected, the second electrode portion is located on a side of the first electrode portion away from the active material coating portion, the accommodating portion is provided at the first electrode portion or at the first electrode portion and the second electrode portion, and the conductive portion is electrically connected with the first electrode portion.

21. The battery cell according to claim 2, wherein the housing portion has a fourth housing groove, a surface of the first electrode on a side away from the active material coating portion is an outer end surface of the electrode, a notch of the fourth housing groove is formed on the outer end surface of the electrode, the fourth housing groove communicates with the inside of the case through a second through hole, the conductive portion is provided through the second through hole, and an electrical connection position of the conductive portion and the first electrode is located on a wall of the second through hole formed by the housing portion.

22. The battery cell of claim 2, further comprising:

the support is located in the shell and located on one side, close to the first pole, of the active material coating portion, an avoidance hole used for avoiding the conductive portion is formed in the support, and the conductive portion is suitable for extending to one side, far away from the active material coating portion, of the support through the avoidance hole.

23. The battery cell of claim 22, wherein the bracket is provided with a guide portion surrounding at least a portion forming the relief hole, the guide portion extending at least partially to the receiving portion.

24. The battery cell as recited in claim 23, wherein an edge of the bracket facing away from the housing cover has a housing entry guide surface comprising an arcuate surface and/or an inclined surface.

25. The battery cell of claim 22, wherein the bracket is of unitary construction; or, the support is split type structure and includes detachable first support and second support, first support with it dodges the hole to inject between the second support.

26. The battery cell of claim 22, further comprising:

And the inner insulating part is positioned in the shell and wrapped outside the active substance coating part and is connected with the bracket.

27. The battery cell of claim 1, wherein the housing assembly includes at least one of the first posts riveted to the housing body.

28. The battery cell of claim 26, wherein the housing is provided with a mounting hole, the first post comprises an integrally formed post body, a first limiting table and a second limiting table, the post body is threaded through the mounting hole, the first limiting table and the second limiting table are disposed at two ends of the post body along an axial direction of the mounting hole, the first limiting table is in limiting fit with an outer side of the housing, and the second limiting table is in limiting fit with an inner side of the housing, so that the first post is riveted to the housing.

29. The battery cell of claim 28, wherein a dimension of the first post in a first direction is greater than a dimension of the first post in a second direction, the first direction and the second direction being perpendicular, the first direction and the second direction both being perpendicular to an axial direction of the mounting hole.

30. The battery cell of claim 1, wherein the housing has oppositely disposed second and third wall portions, each of the second and third wall portions being provided with at least one of the first posts.

31. The battery cell according to claim 1, wherein the case has a plurality of wall portions, a portion of the plurality of wall portions being a first set wall portion having an area larger than an area of the remaining wall portions, the first post being provided on the first set wall portion.

32. The battery cell of claim 1, wherein the housing has a plurality of walls, at least one of the plurality of walls being a second set wall, the battery cell further comprising a pressure relief portion provided on the second set wall, the first post being provided on the remaining walls other than the second set wall.

33. The battery cell of claim 1, further comprising a pressure relief portion disposed on the housing cover, wherein the pressure relief portion and the housing cover are integrally formed.

34. The battery cell of claim 1, wherein the housing has a plurality of walls, at least one of the plurality of walls is a first wall, the first post is riveted to the first wall, and the thickness of the first wall is greater than the thickness of the remaining walls.

35. The battery cell of claim 34, wherein the thickness of the cap is less than the thickness of the first wall portion.

36. The battery cell of claim 35, wherein the thickness of the cap is greater than the thickness of the remaining wall portions except for the first wall portion and adjacent to the cap.

37. The battery cell of claim 1, wherein the opening is provided in a bottom of the housing.

38. The battery cell of claim 37, wherein the active material coating portion has a first end surface proximate the housing cover, the battery cell further comprising an inner insulator surrounding the cell assembly, at least a portion of the inner insulator disposed between the first end surface and the housing cover, the inner insulator having opposing first and second surfaces, the first surface in contact with the first end surface and the second surface in contact with the housing cover.

39. The battery cell of claim 1, wherein the housing has a first wall portion opposite the housing cover, the first post being disposed on the first wall portion.

40. A battery comprising a cell according to any one of claims 1-39.

41. An electrical device comprising a battery cell according to any one of claims 1-39; alternatively, a battery according to claim 40 is included.