CN216793839U

CN216793839U - Battery cell structure and battery

Info

Publication number: CN216793839U
Application number: CN202220235906.1U
Authority: CN
Inventors: 宁亚军
Original assignee: Svolt Energy Technology Wuxi Co Ltd
Current assignee: Svolt Energy Technology Wuxi Co Ltd
Priority date: 2022-01-27
Filing date: 2022-01-27
Publication date: 2022-06-21
Anticipated expiration: 2032-01-27

Abstract

The utility model discloses a battery cell structure and a battery, wherein the battery cell structure comprises: a winding core; the shell is sleeved outside the winding core, and the end part of the shell is provided with an insulated and spaced positive terminal; the positive connecting piece comprises a cylinder portion and a current collecting portion, the current collecting portion is attached to the end face of the winding core and located in the shell, the cylinder portion is connected with one side, away from the winding core, of the current collecting portion, the cylinder portion penetrates through the end portion of the shell, and the positive terminal sleeve is arranged outside the cylinder portion and connected with the current collecting portion. According to the cell structure provided by the embodiment of the utility model, the cylindrical part penetrates through the positive terminal to extend to the outer side of the shell, so that the cylindrical part and the positive terminal are welded conveniently, the connection strength of the positive terminal and the positive connecting sheet is improved, the cell structure has higher stability, the contact area of the positive terminal and the positive connecting sheet is increased, and the conductivity of the cell structure is improved.

Description

Battery cell structure and battery

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery cell structure and a battery with the battery cell structure.

Background

With the increasing maturity of lithium ion battery technology, lithium ion batteries are widely used in the field of electric vehicles as power batteries. In the related art, the connecting sheet is an important overcurrent carrier of the battery as a structure for starting and stopping the inside of the battery cell, and along with the development of the industry, the requirement on the quick charging and discharging performance of the battery is higher and higher, the requirement on the overcurrent capacity and the safety capacity of the lithium battery is also higher and higher, and therefore the requirement on the connecting sheet is higher and higher. The existing connecting piece is poor in installation stability and overcurrent capacity, cannot meet the requirements of the overcurrent capacity and safety capacity of a lithium battery, and has an improved space.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solving at least one of the problems of the prior art. Therefore, an object of the present invention is to provide a cell structure, which improves connection stability and connection area between a positive connection sheet and a positive terminal, and improves overall performance of the cell structure.

The cell structure according to the embodiment of the utility model comprises: a winding core; the shell is sleeved outside the winding core, and the end part of the shell is provided with an insulated and spaced positive terminal; the positive connecting piece comprises a cylinder portion and a current collecting portion, the current collecting portion is attached to the end face of the winding core and located in the shell, the cylinder portion is connected with one side, away from the winding core, of the current collecting portion, the cylinder portion penetrates through the end portion of the shell, and the positive terminal sleeve is arranged outside the cylinder portion and connected with the current collecting portion.

According to the battery cell structure provided by the embodiment of the utility model, the cylindrical part penetrates through the positive terminal to extend to the outer side of the shell, so that the cylindrical part and the positive terminal are welded conveniently, the connection strength of the positive terminal and the positive connecting sheet is improved, the battery cell structure has higher stability, the contact area of the positive terminal and the positive connecting sheet is increased, and the conductivity of the battery structure is improved.

According to the battery cell structure provided by some embodiments of the utility model, the middle part of the current collecting part is provided with the sunken installation sinking groove, one side of the installation sinking groove, which is far away from the cylinder part, is attached to the winding core, and the end part of the cylinder part extends into the installation sinking groove to be connected with the current collecting part in a welding manner.

According to the cell structure of some embodiments of the present invention, the positive terminal is connected to the inner bottom wall of the installation sink.

According to the battery cell structure of some embodiments of the present invention, the peripheral wall of the positive terminal at one end of the mounting sinking groove is provided with a connecting flange which is turned out outward in the radial direction, and the end face of the positive terminal and the connecting flange are both connected to the inner bottom wall.

According to the battery cell structure of some embodiments of the present invention, the current collecting portion is further provided with a concave pressing sinking groove, the pressing sinking groove is located at the radial outer side of the installation sinking groove and extends along the radial direction of the current collecting portion, and one side of the pressing sinking groove, which is away from the column portion, is attached to the winding core.

According to the cell structure of some embodiments of the present invention, the pressing sinking grooves are plural, and the plural pressing sinking grooves are distributed at intervals in the circumferential direction of the installation sinking groove.

According to the battery cell structure of some embodiments of the utility model, the winding core is provided with an electrolyte chamber which is open at an end, the current collecting part is provided with a first communication hole, the column part is provided with a second communication hole, the second communication hole and the first communication hole are sequentially communicated with the electrolyte chamber, and the column part is provided with a sealing assembly for sealing the second communication hole.

According to the battery cell structure of some embodiments of the present invention, the sealing assembly includes a sealing nail and a rubber nail, the rubber nail is located in the second communication hole to close the second communication hole, the sealing nail is welded to the column, and the sealing nail is located at an end of the rubber nail facing away from the current collecting portion.

According to the battery cell structure of some embodiments of the utility model, a mounting hole is formed at one end of the column part, which is far away from the current collecting part, the mounting hole is communicated with the second communication hole, the diameter of the mounting hole is larger than that of the second communication hole so as to form a mounting surface at the connection part of the mounting hole and the second communication hole, and the outer peripheral wall of the sealing nail is connected with the inner peripheral wall of the mounting hole in a welding mode.

The utility model also provides a battery.

According to the battery provided by the embodiment of the utility model, the battery cell structure disclosed by any one of the embodiments is arranged.

Compared with the prior art, the advantages of the battery and the battery cell structure are the same, and are not described again.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is an exploded view of a cell structure according to an embodiment of the present invention;

fig. 2 is a cross-sectional view of a cell structure according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a positive electrode connecting sheet in a cell structure according to an embodiment of the present invention;

fig. 4 is a top view of a positive electrode tab in a cell structure according to an embodiment of the present invention;

fig. 5 is a cross-sectional view at a-a in fig. 4.

Reference numerals:

the structure of the battery cell 100 is,

a winding core 1, an electrolyte cavity 11, a shell 2, a positive terminal 21, a connecting flange 211, an insulating piece 22,

the positive electrode connecting sheet 3, the column 31, the second communication hole 311, the mounting hole 312, the current collecting portion 32, the mounting sink 321, the pressing sink 322, the first communication hole 333,

seal assembly 4, seal nail 41, rubber nail 42, negative pole connection piece 5, negative pole apron 6.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

Referring to fig. 1 to fig. 5, a cell structure 100 according to an embodiment of the present invention is described, where the cell structure 100 may be applied to a cylindrical battery, and the positive connection piece 3 is disposed to extend through the positive terminal 21 to extend out of the housing 2, so as to facilitate connection between the positive terminal 21 and the positive connection piece 3, thereby improving safety of the cell, increasing a connection area between the positive connection piece 3 and the positive terminal 21, and improving a current carrying capacity of the cell structure 100. Of course, the battery cell structure 100 according to the embodiment of the present invention may also be applied to other batteries with similar structures, and the present invention is not limited thereto.

As shown in fig. 1, a cell structure 100 according to an embodiment of the present invention includes: a winding core 1, a shell 2 and a positive connecting sheet 3.

Wherein, as shown in fig. 1, roll up core 1 and adopt the coiling mode to construct and be cylindrical usually, roll up core 1 and be used for storing the electric energy, and roll up core 1 and set up respectively to anodal and negative pole along length direction's both ends, be anodal if the upper end that sets up roll core 1, and the lower extreme that sets up roll core 1 is the negative pole, like this, can carry out the electricity with the both ends of rolling up core 1 respectively with external power source and be connected, make external power source can charge to roll core 1, and can be connected with the both ends electricity of rolling up core 1 with for the electrical equipment, make roll core 1 can supply power outward, make roll core 1 have the function of charge-discharge.

The shell 2 is sleeved outside the winding core 1, and an insulated and spaced positive terminal 21 is arranged at the end of the shell 2. That is, as shown in fig. 1, the shell 2 may be correspondingly configured to be a cylindrical structure, the shell 2 has a mounting cavity with an open lower end, and the size of the mounting cavity is larger than that of the winding core 1, and the shell 2 may be sleeved on the outer side of the winding core 1 from the upper end to mount the winding core 1 into the mounting cavity; positive terminal 21 is installed to casing 2's upper end, and positive terminal 21 is used for and rolls up the anodal electric connection of core 1 to outside power supply, and be equipped with insulating part 22 between positive terminal 21 and the casing 2, insulating part 22 can separate positive terminal 21 and casing 2 completely, reveals to casing 2 with the electric current of avoiding rolling up core 1, avoids appearing the condition of electric leakage or short circuit, has improved electric core structure 100's security.

Specifically, as shown in fig. 2, the upper end of the housing 2 is provided with a mounting through hole communicated with the mounting cavity, an insulating member 22 is arranged in the mounting through hole, the insulating member 22 is configured as a stepped annular structure with a larger diameter at the upper end, the lower end of the insulating member 22 can extend downwards into the mounting through hole, the outer side wall of the insulating member 22 can be supported on the inner side wall of the mounting through hole, and the lower side surface of the upper end of the insulating member 22 can be supported on the upper end surface of the housing 2, so that the insulating member 22 can be stably mounted on the housing 2. Meanwhile, the positive terminal 21 is configured as a stepped cylinder having a larger diameter at an upper end portion, the lower end portion of the positive terminal 21 may be supported on an inner sidewall of the lower end portion of the insulator 22 in a radial direction and downwardly penetrate the insulator 22 to extend into the mounting cavity, and the upper end portion of the positive terminal 21 may be supported at the inner sidewall of the upper end portion of the insulator 22. Therefore, the insulating member 22 can separate the positive terminal 21 from the casing 2, and can be fixed among the casing 2, the insulating member 22 and the positive terminal 21 by gluing or the like, which is beneficial to improving the stability of the battery cell structure 100.

The positive electrode connecting piece 3 includes a column portion 31 and a current collecting portion 32, the current collecting portion 32 is attached to the end face of the winding core 1 and is located in the case 2, the column portion 31 is connected to one side of the current collecting portion 32 departing from the winding core 1, the column portion 31 penetrates through the end portion of the case 2, and the positive electrode terminal 21 is sleeved outside the column portion 31 and is connected to the current collecting portion 32.

That is, as shown in fig. 1 and 3, the current collecting portion 32 may be configured as a circular plate structure, the current collecting portion 32 is mounted in the case 2 and located between the upper end of the case 2 and the upper end surface of the winding core 1, and the current collecting portion 32 is attached to the upper end surface of the winding core 1 (i.e., the positive electrode of the winding core) to collect the current generated by the winding core 1 so as to supply the current to the outside in a concentrated manner. Wherein, can be equipped with insulating barrier between the upper end of mass flow portion 32 and casing 2, insulating barrier is used for separating mass flow portion 32 and casing 2 are insulating to avoid rolling up the electric current of core 1 and reveal to casing 2 on, improved electric core structure 100's overall reliability.

Further, the column 31 may be connected to a side (upper side) of the current collecting portion 32 away from the winding core 1, and located in an area facing the positive electrode terminal 21, the column 31 extends upward, and correspondingly, the positive electrode terminal 21 may be provided with a communication hole penetrating vertically, the communication hole is facing the column 31, and a diameter of the communication hole is equal to a diameter of the column 31. Like this, the column portion 31 can stretch into the intercommunicating pore from the bottom up, and the outer side wall of the column portion 31 can be connected with the inner side wall of the intercommunicating pore, so as to improve the contact area between the positive terminal 21 and the positive connecting sheet 3, and to improve the conductivity of the battery cell.

Wherein, the upper end of cylinder portion 31 can extend to the position department with the side parallel and level of going up of positive terminal 21, at this moment, can weld cylinder portion 31 and positive terminal 21 from the outside, in order to firmly fix together cylinder portion 31 and positive terminal 21, the joint strength of positive terminal 21 and positive connection piece 3 has been improved, make positive terminal 21 and positive connection piece 3 can keep the intercommunication when electric core structure 100 receives the impact after, in order to prevent that electric core structure 100 resistance is too big and lead to the condition of catching fire, and avoided positive terminal 21 and the condition that positive connection piece 3 disconnect-connection leads to electric core structure 100 to damage, the reliability and the security of electric core structure 100 have been improved.

It should be noted that, as shown in fig. 1, negative pole connection piece 5 and negative pole apron 6 are still installed to the lower extreme of casing 2, negative pole connection piece 5 is used for laminating at the lower extreme of rolling up core 1, in order to collect the electric current of rolling up core 1, and negative pole apron 6 can insulation installation at the lower extreme of casing 2, in order to be used for sealed installation cavity, thereby prevent to roll up core 1 and break away from the installation cavity, and simultaneously, the last side laminating of negative pole apron 6 is on negative pole connection piece 5, through negative pole apron 6 and positive terminal 21 combined action, make electric core structure 100 can be connected with the external electricity, thereby realize charge-discharge function.

In specific installation, can fix positive connection piece 3 in the upper end of rolling up core 1 in advance to establish the outside at rolling up core 1 with casing 2 from the top down cover, make the column body portion 31 of positive connection piece 3 can extend to in the intercommunication hole of positive terminal 21, and the lateral wall of column body portion 31 and the inside wall laminating of intercommunication hole, at this moment, can realize the fixed of column body portion 31 and positive terminal 21 through the welding, fix at the installation intracavity with rolling up core 1. And further lift up casing 2 to laminate negative pole connection piece 5 to the lower extreme of rolling up core 1, install negative pole apron 6 to casing 2's lower extreme at last, and weld, thereby effectively seal the installation cavity, can accomplish the processing of electric core.

According to the battery cell structure 100 provided by the embodiment of the utility model, the cylindrical part 31 is arranged to penetrate through the positive terminal 21 so as to extend to the outer side of the shell 2, so that the cylindrical part 31 and the positive terminal 21 can be welded conveniently, the connection strength between the positive terminal 21 and the positive connecting piece 3 is improved, the battery cell structure 100 has high stability and safety, the contact area between the positive terminal 21 and the positive connecting piece 3 is increased, and the conductivity of the battery cell structure 100 can be improved conveniently.

In some embodiments, a concave mounting sinking groove 321 is formed in the middle of the current collecting portion 32, the side of the mounting sinking groove 321 away from the cylindrical portion 31 is attached to the winding core 1, and the end of the cylindrical portion 31 extends into the mounting sinking groove 321 for welding connection of the current collecting portion 32.

That is, as shown in fig. 3, the current collecting portion 32 and the cylindrical portion 31 are separately processed, the current collecting portion 32 may be configured as a circular plate structure, a mounting sunken groove 321 recessed downward is formed in a middle region of the current collecting portion 32, and a lower side of the current collecting portion 32 is attached to an upper end surface of the core 1 corresponding to a region of the mounting sunken groove 321, so as to electrically connect the current collecting portion 32 and the core 1. Meanwhile, the column 31 is configured as a cylindrical structure, the diameter of the installation sinking groove 321 is larger than that of the column 31, the column 31 can be installed in the middle area of the current collecting portion 32 at intervals by the inner peripheral wall of the installation sinking groove 321, and pressed downward against the bottom wall of the installation sinking groove 321, and the current collecting portion 32 and the column 31 are connected by laser welding, so that the positive connecting piece 3 can be configured.

Wherein, through setting up installation heavy groove 321, when positive pole connection piece 3 installs to the up end of core 1, installation heavy groove 321 back of body 31 one side links to each other with the laminating of core 1, and the current collecting portion 32 encircles the part of installation heavy groove 321 and the up end of core 1 spaced apart in order to form and soak the chamber, soaks the chamber and can be used for storing partial electrolyte to improve the infiltration rate of electrolyte to core 1, thereby promoted core 1's performance.

It can be understood that the positive electrode connecting sheet 3 is constructed by separately processing the current collecting portion 32 and the column portion 31 and welding and assembling the current collecting portion and the column portion after the processing is completed, so that the processing difficulty is reduced, the processing cost is reduced, and the competitiveness of the product is effectively improved.

In some embodiments, the positive terminal 21 is connected to the inner bottom wall of the mounting sinker 321. That is to say, as shown in fig. 2, the diameter that can set up the heavy groove 321 of installation is greater than the diameter of positive terminal 21 for positive terminal 21 can be dodged to the inside wall of the heavy groove 321 of installation, like this, after rolling up core 1 and installing to casing 2, the lower extreme of positive terminal 21 can support downwards and press on the diapire of the heavy groove 321 of installation, through connecting positive terminal 21 and mass flow portion 32, the area of contact of positive connection piece 3 and positive terminal 21 has been improved, do benefit to the bulk resistance that reduces electric core structure 100, thereby improve electric core structure 100's overcurrent ability.

In some embodiments, the outer peripheral wall of the positive terminal 21 at the end of the mounting recess 321 is provided with a connecting flange 211 turned radially outward, and the end face of the positive terminal 21 and the connecting flange 211 are connected to the inner bottom wall. That is to say, as shown in fig. 2, the lower end of the positive terminal 21 is provided with a connecting flange 211 extending radially outward, the diameter of the connecting flange 211 is smaller than the inner diameter of the mounting sunken groove 321, and the lower side surface of the connecting flange 211 is flush with the lower side surface of the positive terminal 21, when the winding core 1 is mounted and the lower end of the positive terminal 21 abuts against the bottom wall of the mounting sunken groove 321, the lower side surface of the connecting flange 211 also abuts against the bottom wall of the mounting sunken groove 321, so that the contact area between the positive connecting piece 3 and the positive terminal 21 is further increased, which is beneficial to reducing the resistance of the battery cell structure 100, thereby improving the overcurrent capacity of the battery cell structure 100.

In some embodiments, the current collecting portion 32 is further provided with a concave pressing sinking groove 322, the pressing sinking groove 322 is located at the radial outer side of the installation sinking groove 321 and extends along the radial direction of the current collecting portion 32, and one side of the pressing sinking groove 322, which is away from the cylindrical portion 31, is attached to the winding core 1.

That is to say, as shown in fig. 3 and fig. 4, the current collecting portion 32 is provided with a pressing sinking groove 322 around the mounting sinking groove 321, the pressing sinking groove 322 extends along the radial direction of the current collecting portion 32 (i.e. the radial direction of the mounting sinking groove 321), and the depth of the pressing sinking groove 322 is the same as that of the mounting sinking groove 321, so that the lower side surface of the current collecting portion 32 located in the pressing sinking groove 322 and the lower side surface of the mounting sinking groove 321 are in the same horizontal plane, therefore, when the positive connecting sheet 3 is mounted on the upper end surface of the winding core 1, the side surface of the pressing sinking groove 322 departing from the cylindrical portion 31 and the side surface of the mounting sinking groove 321 departing from the cylindrical portion 31 can be supported on the upper end surface of the winding core 1 together, thereby increasing the contact area between the current collecting portion 32 and the winding core 1, and improving the mounting stability of the current collecting portion 32.

Further, the inner end of the pressing sinking groove 322 can be connected with the outer end of the installation sinking groove 321, and the radial outer end of the pressing sinking groove 322 extends to the outermost side of the current collecting part 32, so that the infiltration cavity formed between the current collecting part 32 and the upper end face of the winding core 1 can be cut off, when the battery cell structure 100 vibrates, the possibility that electrolyte in the infiltration cavity vibrates can be reduced, the infiltration rate of the winding core 1 is improved, and the performance of the battery cell structure 100 is improved.

In some embodiments, the pressing sinking groove 322 is a plurality of sinking grooves 322, and the plurality of sinking grooves 322 are spaced apart in the circumferential direction of the installation sinking groove 321. That is to say, through setting up a plurality of heavy grooves 322 that press, when positive pole connection piece 3 installs to the up end of core 1, a plurality of heavy grooves 322 that press deviate from the side of cylinder portion 31 and the side that installation heavy groove 321 deviates from cylinder portion 31 can support at the up end of core 1 jointly to the area of contact of collecting portion 32 and core 1 has been increased, the installation stability of collecting portion 32 is improved. Meanwhile, the infiltration cavity formed between the current collecting part 32 and the upper end face of the winding core 1 can be divided into a plurality of cavities, so that when the battery cell structure 100 vibrates, the vibration of electrolyte in the infiltration cavity can be effectively reduced, the infiltration rate of the winding core 1 is improved, and the performance of the battery cell structure 100 is improved.

Specifically, as shown in fig. 3 and fig. 4, six abutting sinking grooves 322 may be provided, the six abutting sinking grooves 322 are uniformly spaced around the circumference of the current collecting portion 32 (i.e., the circumference of the mounting sinking groove 321), and when the positive connecting sheet 3 is mounted to the upper end surface of the winding core 1, the side surfaces of the six abutting sinking grooves 322 facing away from the cylindrical portion 31 and the side surfaces of the mounting sinking grooves 321 facing away from the cylindrical portion 31 may be supported on the upper end surface of the winding core 1 together, so as to improve the mounting stability of the current collecting portion 32.

Meanwhile, the inner ends of the pressing sinking grooves 322 are connected with the outer end of the mounting sinking groove 321, and the radial outer ends of the pressing sinking grooves 322 extend to the outermost side of the collecting part 32, so that the infiltration cavity formed between the collecting part 32 and the upper end face of the winding core 1 can be divided into six uniform sub-cavities, the possibility of oscillation of electrolyte in the infiltration cavity is reduced, the infiltration rate of the winding core 1 is improved, and the performance of the winding core 1 is improved.

In some embodiments, the winding core 1 is provided with the electrolyte chamber 11 opened at the end, the current collecting part 32 is provided with a first communicating hole 333, the cylindrical part 31 is provided with a second communicating hole 311, the first communicating hole 333 and the electrolyte chamber 11 are communicated in sequence, and the cylindrical part 31 is provided with the sealing assembly 4 for closing the second communicating hole 311.

That is, as shown in fig. 2, an electrolyte chamber 11 extending in the vertical direction may be provided in the winding core 1, the electrolyte chamber 11 is configured to be a column shape, and the upper end of the electrolyte chamber 11 has a circular opening, the current collecting portion 32 is provided with a first communicating hole 333 opposite to the opening of the electrolyte chamber 11 (preferably, the diameter of the first communicating hole 333 may be set to be smaller than or equal to the diameter of the opening), the column portion 31 is provided with a second communicating hole 311 penetrating in the vertical direction, the second communicating hole 311 is provided opposite to the first communicating hole 333, and the diameter of the second communicating hole 311 is equal to the diameter of the first communicating hole 333, and by welding the current collecting portion 32 and the column portion 31 together, the second communicating hole 311 and the first communicating hole 333 together form a liquid injection channel, and electrolyte may be injected into the electrolyte chamber 11 through the liquid injection channel to supplement the electrolyte of the cell structure 100.

Further, be equipped with seal assembly 4 in the second intercommunicating pore 311 of column part 31, seal assembly 4 is used for linking to each other with column part 31 to realize the sealed of second intercommunicating pore 311, thereby seal the notes liquid passageway, in order to prevent that electrolyte from annotating liquid passageway outflow to the external world, improved the reliability of electric core.

When the electrolyte injection is completed and the battery starts to be charged for the first time, the electrolyte generates a formation reaction to form the winding core 1 into the positive electrode and the negative electrode. The sealing assembly 4 may be installed after the cell structure 100 is charged for the first time, so that when a large amount of gas is generated in the formation process of the electrolyte, the gas may flow out of the electrolyte cavity 11 along the liquid injection channel, thereby preventing the cell structure 100 from swelling and expanding, and realizing the formation of the opening of the cell structure 100; or, the sealing assembly 4 may be installed before the cell structure 100 is charged for the first time, so that in the formation process, external impurities may be prevented from entering the electrolyte chamber 11 to prevent the electrolyte from being polluted, the reliability of the electrolyte is improved, and the formation of the opening of the cell structure 100 is realized.

Through the arrangement, the battery cell structure 100 can have two processes of opening formation and closing formation, and designers can freely select according to the property of the electrolyte in the formation process (such as the gas generation amount or the purity requirement of the electrolyte), so that the battery cell structure 100 and the practicability are improved.

In some embodiments, as shown in fig. 1, the sealing assembly 4 includes a sealing nail 41 and a rubber nail 42, the rubber nail 42 is located in the second communication hole 311 to close the second communication hole 311, the sealing nail 41 is connected to the cylindrical portion 31 by welding, and the sealing nail 41 is located at an end of the rubber nail 42 facing away from the current collecting portion 32. The material of the sealing nail 41 and the cylinder 31 may be aluminum, or other metal material with the same property.

That is, as shown in fig. 2, the diameter of the rubber nail 42 may be slightly larger than the diameter of the second communication hole 311, when the rubber nail 42 is plugged into the second communication hole 311, the rubber nail 42 may be deformed to be clamped in the second communication hole 311, thereby effectively closing the second communication hole 311, preventing the electrolyte in the electrolyte chamber 11 from leaking outwards, and at the same time, the sealing nail 41 is installed at one end (i.e., the upper end) of the rubber nail 42 facing away from the current collecting portion 32, at which time, the sealing nail 41 is exposed outwards, and the sealing nail 41 may be laser-welded with the cylindrical portion 31 from the outside to fix the sealing nail 41 on the cylindrical portion 31, so that the sealing nail 41 may support the rubber nail 42 from the upper end, prevent the rubber nail 42 from coming off the second communication hole 311, and improve the sealing reliability.

In some embodiments, an end of the column 31 facing away from the collecting portion 32 is formed with a mounting hole 312, the mounting hole 312 communicates with the second communication hole 311, and a diameter of the mounting hole 312 is larger than a diameter of the second communication hole 311 to form a mounting surface at a connection with the second communication hole 311, and an outer circumferential wall of the seal nail 41 is welded to an inner circumferential wall of the mounting hole 312.

That is, as shown in fig. 2, the mounting hole 312 is provided at the upper end of the second communication hole 311 of the column 31, the mounting hole 312 is disposed opposite to the second communication hole 311, and the diameter of the mounting hole 312 is larger than that of the second communication hole 311, so that a mounting surface can be formed at the bottom wall of the mounting hole 312, correspondingly, the seal nail 41 can be configured in a disc structure, and the diameter of the seal nail 41 is equal to that of the mounting hole 312, so that the seal nail 41 can be supported on the mounting surface of the mounting hole 312 to position the seal nail 41, and the outer circumferential wall of the seal nail 41 can be attached to the inner circumferential wall of the mounting hole 312, and the seal nail 41 can be mounted by laser welding the outer circumferential wall of the seal nail 41 and the inner circumferential wall of the mounting hole 312.

It should be noted that, the depth of the mounting hole 312 may be set to be equal to the thickness of the sealing nail 41, so that, after the sealing nail 41 is mounted, the upper end face of the sealing nail 41 is flush with the upper end face of the cylindrical portion to form a smooth contact surface, so as to reduce the impact on the sealing nail 41 and facilitate improvement of the mounting stability of the sealing nail 41. Simultaneously, can set up the pit respectively at sealed nail 41's upper and lower both ends, the pit just sets up and the diameter equals with second intercommunicating pore 311 to second intercommunicating pore 311, like this, when electrolyte chamber 11 is too big to lead to rubber nail 42 rebound, the pit can dodge rubber nail 42, does benefit to and alleviates the pressure in electrolyte chamber 11.

The utility model also provides a battery.

According to the battery of the embodiment of the utility model, the battery cell structure 100 of any one of the above embodiments is provided. Run through positive terminal 21 in order to extend the outside of casing 2 through setting up the barrel, in order to do benefit to the welding between realization barrel 31 and the positive terminal 21, improve the joint strength of positive terminal 21 and positive connection piece 3, make the battery have higher stability and security, and increased the area of contact of positive terminal 21 and positive connection piece 3, do benefit to the electric conductive property that improves electric core structure 100, the wholeness ability of battery has been improved, especially when the battery is applied to the vehicle or when other electric installation of treating, can effectively improve the power consumption security, thereby user's safety has been guaranteed.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, but are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the utility model.

In the description of the present invention, "the first feature" and "the second feature" may include one or more of the features.

In the description of the present invention, "a plurality" means two or more.

In the description of the present invention, the first feature being "on" or "under" the second feature may include the first and second features being in direct contact, and may also include the first and second features being in contact with each other not directly but through another feature therebetween.

In the description of the utility model, "above", "over" and "above" a first feature in a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the utility model have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the utility model, the scope of which is defined by the claims and their equivalents.

Claims

1. A cell structure (100), comprising:

a winding core (1);

the shell (2) is sleeved outside the winding core (1), and an insulated and spaced positive terminal (21) is arranged at the end part of the shell (2);

anodal connection piece (3), anodal connection piece (3) are including column portion (31) and current collection portion (32), current collection portion (32) with the terminal surface laminating of rolling up core (1) and being located in casing (2), column portion (31) with current collection portion (32) deviate from roll up one side of core (1) and link to each other, just column portion (31) run through the tip of casing (2), positive terminal (21) cover is located outside column portion (31) and with current collection portion (32) link to each other.

2. The cell structure (100) of claim 1, wherein a recessed installation sinking groove (321) is formed in the middle of the current collecting portion (32), one side of the installation sinking groove (321) facing away from the cylindrical portion (31) is attached to the winding core (1), and the end of the cylindrical portion (31) extends into the installation sinking groove (321) to be connected to the current collecting portion (32) in a welding manner.

3. The cell structure (100) of claim 2, wherein the positive terminal (21) is connected to an inner bottom wall of the installation sink (321).

4. The cell structure (100) of claim 3, wherein a connection flange (211) which is turned out radially outward is formed on an outer peripheral wall of the positive terminal (21) at one end of the installation sunken groove (321), and an end face of the positive terminal (21) and the connection flange (211) are connected to the inner bottom wall.

5. The cell structure (100) of claim 2, wherein the current collecting portion (32) is further provided with a concave pressing sinking groove (322), the pressing sinking groove (322) is located at a radial outer side of the installation sinking groove (321) and extends along a radial direction of the current collecting portion (32), and one side of the pressing sinking groove (322) facing away from the cylindrical portion (31) is attached to the winding core (1).

6. The cell structure (100) of claim 5, wherein the pressing sink groove (322) is a plurality of pressing sink grooves (322), and the pressing sink grooves (322) are distributed at intervals in the circumferential direction of the installation sink groove (321).

7. The cell structure (100) according to claim 1, wherein the winding core (1) is provided with an electrolyte chamber (11) which is open at the end, the current collector (32) is provided with a first communication hole (333), the column portion (31) is provided with a second communication hole (311), the first communication hole (333) and the electrolyte chamber (11) are sequentially communicated, and the column portion (31) is provided with a sealing assembly (4) for sealing the second communication hole (311).

8. The cell structure (100) according to claim 7, wherein the sealing assembly (4) comprises a sealing nail (41) and a rubber nail (42), the rubber nail (42) is located in the second communication hole (311) to close the second communication hole (311), the sealing nail (41) is welded to the column portion (31), and the sealing nail (41) is located at one end of the rubber nail (42) facing away from the current collecting portion (32).

9. The cell structure (100) according to claim 8, wherein a mounting hole (312) is formed at an end of the cylindrical portion (31) facing away from the current collecting portion (32), the mounting hole (312) is communicated with the second communication hole (311), the diameter of the mounting hole (312) is larger than that of the second communication hole (311) to form a mounting surface at a connection position with the second communication hole (311), and an outer circumferential wall of the seal nail (41) is welded to an inner circumferential wall of the mounting hole (312).

10. A battery, characterized in that a cell structure (100) according to any of claims 1 to 9 is provided.