CN219917486U - Battery cell, battery and electricity utilization device - Google Patents
Battery cell, battery and electricity utilization device Download PDFInfo
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- CN219917486U CN219917486U CN202320386766.2U CN202320386766U CN219917486U CN 219917486 U CN219917486 U CN 219917486U CN 202320386766 U CN202320386766 U CN 202320386766U CN 219917486 U CN219917486 U CN 219917486U
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- Connection Of Batteries Or Terminals (AREA)
Abstract
The application discloses a battery monomer, a battery and an electric device. The battery cell includes: a housing; a cell assembly; the bracket is arranged at one end of the battery cell component; the insulating piece is matched with the bracket and coats the battery cell assembly; the battery cell assembly, the support and the insulating piece are arranged in the shell, and at least one part of the insulating piece is connected with the wall surface, far away from the battery cell assembly, of the support. According to the technical scheme, the connection reliability between the insulating part and the support can be improved, the risk of falling of the insulating part is reduced, the risk of corrosion of the shell due to bare leakage of the battery cell assembly can be further reduced, the risk of failure of the battery cell assembly is reduced, the risk of liquid leakage is reduced, and the reliability and stability of the battery cell can be further improved.
Description
Technical Field
The application relates to the field of batteries, in particular to a battery monomer, a battery and an electric device.
Background
Energy conservation and emission reduction are key to sustainable development of the automobile industry, and electric vehicles become an important component of sustainable development of the automobile industry due to the energy conservation and environmental protection advantages of the electric vehicles. For electric vehicles, battery technology is an important factor in the development of the electric vehicles. In the related art, the reliability of the battery cell is to be improved, which hinders further improvement of the reliability of the battery.
Disclosure of Invention
In view of the above, the present utility model provides a battery cell, a battery, and an electric device with high reliability.
In a first aspect, the present utility model provides a battery cell comprising: a housing; a cell assembly; the bracket is arranged at one end of the battery cell component; the insulating piece is matched with the bracket and coats the battery cell component; wherein, electric core subassembly, support and insulating part all set up in the casing, and at least part of insulating part is connected with the wall of keeping away from electric core subassembly of support.
According to the technical scheme, at least one part of the insulating piece is connected with the wall surface of the bracket far away from the battery cell assembly, on one hand, in the process of loading the battery cell assembly with the bracket into the shell, the shell is not easy to scratch to the connection position between the insulating piece and the bracket, the connection position between the insulating piece and the bracket is not easy to pull open in the shell loading process, the movement and sliding of the insulating piece in the shell loading process of the battery cell assembly can be reduced, the connection reliability between the insulating piece and the bracket can be improved, the falling risk of the insulating piece is reduced, the corrosion risk of the shell due to bare leakage of the battery cell assembly can be reduced, the failure risk of the battery cell assembly is reduced, the leakage risk is reduced, and the reliability and stability of a battery cell can be further improved; meanwhile, compared with the connection of the insulating part and the peripheral side of the battery cell assembly, the insulating part is matched with the bracket, so that the insulating part is originally adjacent to a plurality of surfaces on the peripheral side of the shell, the probability that the matched position of the insulating part and the bracket is interfered for being adjacent to one surface of one end of the shell is greatly reduced, the reliability and the stability of the insulating part can be further improved, and the reliability and the stability of a battery cell can be improved; in addition, at least one part of the insulating piece is connected with the wall surface of the bracket far away from the battery cell assembly, so that the insulating piece can be designed to be longer in size, the battery cell assembly with different sizes can be suitable, the compatibility is higher, and the manufacturability can be improved; on the other hand, after the bracket and the battery cell component are installed in place in the shell, the insulating part is pressed between the wall surface of the shell opposite to the opening and the bracket, so that the risk of falling off of the insulating part can be further reduced, the risk of failure of the battery cell component due to bare leakage is reduced, the risk of corrosion of the shell is reduced, and the reliability and stability of the battery cell are improved.
In some embodiments, the circumference of the wall surface of the insulating part far away from the battery cell component is in annular continuous connection or annular interval connection with the support, so that the connection area of the insulating part and the support can be increased, the connection reliability and stability between the insulating part and the support in the circumferential direction of the support are improved, the risk of falling off of the insulating part is further reduced, the reliability of the battery cell component entering the shell is further improved, and the reliability and stability of the battery cell are ensured.
In some embodiments, the insulator is thermally fused to a wall of the bracket remote from the cell assembly to form a connection footprint; the connecting marks extend annularly around the circumference of the wall surface; alternatively, the number of the connection marks is plural, and the plural connection marks are arranged at intervals around the circumference of the wall surface. In the technical scheme, on one hand, the insulating part is connected in a hot melting mode, so that the insulating part can be conveniently matched with the bracket, the assembly efficiency is improved, the shell-entering efficiency of the battery cell assembly is ensured, and the assembly and manufacturing cost is saved; on the other hand, whether the connecting marks extend in a circumferential annular shape or are arranged at intervals in the circumferential direction, the connection firmness between the insulating piece and the support can be improved, and the connection reliability and stability of the insulating piece and the support are improved, so that the risk of falling off of the insulating piece is fully reduced; meanwhile, compared with circumferential annular extension, the circumferential interval arrangement can save materials and reduce cost on the basis of ensuring the connection reliability of the insulating piece and the bracket.
In some embodiments, a pole is provided on the housing; the battery core component comprises an active material coating part and a conductive part, wherein the conductive part is connected with one side of the active material coating part, which is close to the bracket, extends towards the polar post and is connected with the polar post, and the insulating part and the bracket are jointly coated on the circumference of the active material coating part. In the technical scheme, the active material coating part is coated with the insulating part and the bracket in the circumferential direction, so that the active material coating part can be completely separated from the shell, the exposure of the active material coating part is reduced, the risks of failure and damage of the battery core assembly are reduced, the reliability and stability of the battery cell are improved, the size of the insulating part can be reduced, and the cost of the insulating part is saved; meanwhile, the insulating piece can be stabilized and protected through the support, so that the reliability and stability of the battery monomer can be fully guaranteed.
In some embodiments, the insulator includes a body insulating portion, a first insulating portion, and a second insulating portion, the body insulating portion being wrapped around a peripheral side of the active material coating portion; the first insulating part and the second insulating part are respectively arranged at two ends of the main insulating part, the first insulating part is positioned at one side of the main insulating part away from the bracket and is wrapped at the end part of the active substance coating part away from the bracket, and the second insulating part is positioned at one side of the main insulating part close to the bracket and is used for being matched with the bracket and jointly wrapping the end part of the active substance coating part close to the bracket with the bracket. The insulating piece is formed by a plurality of parts, the parts can jointly cover the side part, the bottom and the top of the active material coating part with the bracket, and the active material coating part can be completely separated from the shell, so that the exposure of the active material coating part can be fully reduced, the risks of failure and damage of the battery cell assembly are reduced, the risk of corrosion of the shell is reduced, and the reliability and the stability of the battery cell are improved.
In some embodiments, the body insulating portion includes a plurality of body portions; the plurality of main body parts are connected end to end in sequence to form a ring shape, the plurality of main body parts are jointly wrapped on the periphery side of the active material coating part, and the first insulating part and the second insulating part are respectively positioned at two ends of a ring-shaped structure formed by the plurality of main body parts. The plurality of main body parts are connected and then are annular, so that the peripheral side of the active material coating part can be completely wrapped, the peripheral side of the active material coating part is completely separated from the inner wall of the shell, the risk of naked leakage of the active material coating part is reduced, and the reliability and stability of the battery cell are improved.
In some embodiments, the connection locations of any adjacent two body portions have a partial overlap. In the technical scheme, on one hand, the connecting positions of the main body parts are overlapped, so that the connecting positions are not easy to separate or break, the probability and the risk of insulation failure of the overlapped positions can be reduced, the reliability of the battery cell assembly can be improved, and the stability and the reliability of the battery cell are improved; on the other hand, the connection position of the main body part is overlapped, so that the whole insulating part can be fully ensured to be wrapped in the circumferential direction of the active material coating part, the bare leakage of the active material coating part is fully reduced, the risk of corrosion of the shell is reduced, and the reliability and the stability of the battery cell assembly and the battery cell are further improved.
In some embodiments, the peripheral side of the active material coating portion has a plurality of faces; each main body part comprises a main body surface and two flanges arranged on two sides of the main body surface, any two adjacent main body parts are connected through the flanges, and the connecting structures of each main body surface and each two flanges respectively wrap different surfaces of the peripheral side of the active substance coating part. In the technical scheme, on one hand, any two adjacent main body parts can ensure the reliability of connection through flanging connection so as to improve the reliability and stability of the battery cell assembly and the battery cell; on the other hand, the connection positions of the main body surface and each two flanges are respectively wrapped on one surface of the peripheral side of the active material coating part, so that each surface of the peripheral side of the active material coating part can be effectively wrapped, the reliability of the battery cell assembly can be further improved, and the stability and reliability of the battery cell can be improved.
In some embodiments, the peripheral side of the active material coating portion has four faces; the main body insulating part comprises two main body parts which are arranged on two sides of the first insulating part and are respectively a first main body part and a second main body part, the first main body part comprises a first main body surface, a first flanging and a second flanging which are arranged on two sides of the first main body surface, the second main body part comprises a second main body surface, a third flanging and a fourth flanging which are arranged on two sides of the second main body surface, the first flanging is connected with the third flanging, and the second flanging is connected with the fourth flanging; the connecting structure of the first main body surface, the first flanging and the third flanging, the connecting structure of the second main body surface, the second flanging and the fourth flanging respectively wrap four surfaces which are sequentially arranged on the periphery of the active substance coating part. When the peripheral side of the active material coating portion has four surfaces, the battery cell is substantially square, and at this time, the first main body portion and the second main body portion, and the connection structure thereof can completely cover the four surfaces of the peripheral side of the active material coating portion, so that the four surfaces of the peripheral side of the active material coating portion are completely separated from the inner wall of the casing, the risk of bare leakage of the active material coating portion is reduced, and the reliability and stability of the square battery cell are sufficiently improved.
In some embodiments, the first insulating portion has a centerline, and the first body portion and the second body portion are located on either side of the centerline of the first insulating portion, respectively; the first main body part and the second main body part are symmetrically arranged by taking the central line as a symmetrical axis, or the first main body surface and the second main body surface are symmetrically arranged. When the two main body parts are completely symmetrical, the die sinking and the manufacturing of the insulating part are convenient, the cost can be saved, and the production efficiency is improved; when two main body faces symmetry sets up, but the turn-ups of two main body portions can asymmetric setting, can set up the turn-ups of a main body portion longer this moment, and the turn-ups of adjacent main body portion set up to be shorter to connect long turn-ups of some in two main body portions and can wrap up the turn-ups of a short degree, can reduce the naked risk of leaking of active material coating portion on the basis of saving the cost, reduce the risk that the casing is corroded, fully improve square battery cell ground reliability and stability.
In some embodiments, the second insulating portion includes a plurality of insulating portions, and the plurality of insulating portions are connected to the plurality of main body portions in a one-to-one correspondence; any two adjacent insulating parts are partially overlapped, so that the phenomenon that the shell is corroded by the bare leakage of the active substance coating part is effectively reduced.
In some embodiments, each insulating subsection comprises a main face and two sub-faces, the main face is connected with the main face of the corresponding main body part, and the two sub-faces are respectively connected with the two turnups of the corresponding main body part; two sub-surfaces corresponding to any two adjacent turned-ups are connected, and each sub-surface is connected with an adjacent main surface. Through the arrangement of the main surface and the sub-surface, the insulating part can be conveniently coated on the outer side of the battery cell assembly, the manufacturing and assembling efficiency can be ensured, and the manufacturing and assembling cost is saved.
In some embodiments, two partial portions corresponding to any two adjacent cuffs are arranged in a partially overlapping manner; and/or each facet is arranged to partially overlap an adjacent major face. Whether two facet overlap setting, or facet and adjacent main surface overlap setting, can both fully guarantee that whole insulating part can with the firm cooperation of support for whole insulating part and support can cooperate and wrap up in the circumference of active material coating portion, fully reduce the exposure of active material coating portion, reduce the risk that the casing was corroded, improve single steady nature and reliability of battery.
In some embodiments, the connection location of the main body insulating portion and the first insulating portion has a score; and/or the connection position of the main body insulating part and the second insulating part is provided with a notch. In the technical scheme, on one hand, the insulating piece can be folded conveniently so as to smoothly wrap the active material coating part, thereby being beneficial to improving the production and manufacturing efficiency and saving the production and manufacturing cost; on the other hand, the arrangement can reduce errors in the process of coating the insulating part to the active material coating part, and can improve the accuracy and reliability of coating the insulating part and the bracket so as to further improve the stability and reliability of the battery cell.
In some embodiments, a pole is provided on the housing; the cell assembly comprises an active material coating part and a conductive part, wherein the conductive part is connected with one side of the active material coating part, which is close to the bracket, the bracket is provided with a via hole, and the conductive part passes through the via hole to be connected with the pole. On one hand, through the arrangement of the through holes on the bracket, the bracket can play a role of gathering and accommodating the conductive part, so that the conductive part is convenient to connect with the pole, and the assembly reliability and convenience of the battery cell can be improved; on the other hand, the support draws in the conductive part, so that the structure of plastic parts in the original battery cells can be saved, the insulation between the whole battery cell assembly and the shell can be realized through the cooperation of the support and the insulating part, and the manufacturing and production cost can be effectively reduced.
In some embodiments, the bracket is a unitary structure; or, the support is of a split structure and comprises a first support and a second support which are formed independently, and a through hole is defined between the first support and the second support. By arranging the bracket into an integrated structure, the number of parts can be reduced, intermediate connecting pieces are saved, the cost is reduced, the structural strength of the bracket is improved, the assembly process can be simplified, and the production efficiency is improved; by arranging the holder to comprise a first holder and a second holder which are formed separately, the assembly of the holder and the cell assembly is facilitated.
In some embodiments, a side of the bracket facing away from the active material coating portion is provided with a receiving groove in communication with the via hole, the receiving groove receiving at least a portion of the post. In the technical scheme, on one hand, at least part of the polar posts are accommodated in the accommodating groove, so that the whole battery monomer is more compact and reliable in structure, and the improvement of the energy density of the whole battery is facilitated; on the other hand, through the arrangement of the accommodating groove, the insulation between the polar column and part of the shell can be realized through the bracket, so that the stability and the reliability of the battery monomer are further improved; in addition, the storage groove is used for storing the pole, so that the stability and reliability of the pole can be improved, and the stability and reliability of the battery in the process of charging and discharging are guaranteed.
In some embodiments, a guide portion is provided on a side of the bracket facing away from the active material coating portion, the guide portion being circumferentially disposed around the via hole and extending in a direction approaching the post. The guide part can bind, fold and support the conductive part, is convenient for connecting the conductive part and the pole, and can improve the assembly efficiency and the assembly quality of the battery single body.
In some embodiments, the pole is provided with a receiving portion, at least part of the conductive portion is received in the receiving portion, and at least part of the guide portion extends into the receiving portion for guiding the conductive portion to be received in the receiving portion. In the technical scheme, on one hand, the pole is arranged to be of a hollow structure, and the guide part is matched with the hollow structure, so that the conductive part can be guided to be connected with the pole, the connection reliability can be improved, and the assembly efficiency and quality are ensured; on the other hand, the conductive part can be accommodated in the accommodating part, so that the assembly efficiency of the conductive part is improved, the occupied space of the conductive part can be saved, the space of the battery is fully utilized, the cooperation between the support and the pole and between the support and the conductive part is tighter and more reliable, the structure of the battery is compact, and the improvement of the energy density of the battery is facilitated.
In some embodiments, a side of the holder facing the active material application portion is formed with a guide groove communicating with the via hole, the guide groove accommodating at least a portion of the conductive portion, the guide groove having a cross-sectional area gradually increasing in a direction in which the holder approaches the active material application portion. The guide groove can not only hold the conductive part, but also avoid the conductive part, avoid the conductive part from being crushed, reduce the probability of fluffy and turnover of the conductive part, and reduce redundancy.
In some embodiments, the support has at least one first injection flow guide groove thereon, the first injection flow guide groove being located on a side of the support facing the active material coating portion; at least one first liquid injection guide groove is communicated with the guide groove. The first liquid injection guide groove can increase the mobility of electrolyte, improve the liquid injection speed, reduce the formation standing time, the electrolyte can flow along the first liquid injection guide groove towards the guide groove, so that the electrolyte can flow to a preset position, the contact area of the electrolyte and the active material coating part is increased, and the problem of poor infiltration of the active material coating part can be reduced.
In some embodiments, the bracket is provided with a first liquid injection diversion trench, and the first liquid injection diversion trench is positioned at one side of the bracket, which is close to the battery cell component; and/or the bracket is provided with a second liquid injection diversion trench, and the second liquid injection diversion trench is positioned at one side of the bracket, which is far away from the battery cell component. The first liquid injection diversion trench and the second liquid injection diversion trench can increase the mobility of electrolyte, improve the liquid injection speed and reduce the formation standing time.
In some embodiments, the side of the support facing the battery cell assembly is provided with a clearance part for avoiding the outer edge of the side of the battery cell assembly facing the support, so that the risk of the support crushing the battery cell assembly is reduced.
In some embodiments, a limit protrusion is provided on one side of the bracket, and the limit protrusion is clamped with the cell assembly. The limiting convex part can restrict one end of the battery cell assembly, so that the fluffy probability of the outer layer of the battery cell assembly is reduced, one end of the battery cell assembly is protected, the problem that one end of the battery cell assembly touches the shell is solved, and the phenomenon that the shell scratches the battery cell assembly in the shell entering process is reduced.
In some embodiments, a pole is provided on the housing; the battery cell assembly comprises an active substance coating part and a conductive part, and the conductive part is connected with one side of the active substance coating part, which is close to the bracket; the pole is provided with a containing part, and at least part of the conducting part is contained in the containing part and is connected with the pole. 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, the battery with the same volume can accommodate more battery monomers, and the volume energy density of the battery can be improved; in addition, at least part of the conductive part is accommodated in the accommodating part so as to occupy the space in the pole, so that the redundancy of the conductive part in the shell can be reduced to at least a certain extent, the probability of short circuit between the conductive part and the active substance coating part is reduced, the probability of short circuit of the battery cell is reduced, and the working reliability and stability of the battery cell and the battery are improved.
In some embodiments, the accommodating portion has a first accommodating groove, a surface of the pole facing the active material coating portion side is a pole inner end surface, a notch of the first accommodating groove is formed on the pole inner end surface, and at least part 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 pole, so that the weight of the 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 first holding tank forms on the terminal surface in the utmost point post, and the terminal surface is the surface of being close to active material coating portion one side of utmost point post in the terminal for first holding tank can be opened towards the direction of active material coating portion, and then makes things convenient for the conducting part to stretch into in the first holding tank, improves assembly efficiency. Moreover, the first accommodating groove in the form is convenient to process, and production efficiency is improved.
In some embodiments, the accommodating portion has a second accommodating groove, the surface of the 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 perforation, and the conductive portion is penetrated in the perforation and at least partially accommodated in the second accommodating groove. In the technical scheme, on one hand, the second accommodating groove is formed in the pole, so that the weight of the 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 utmost point post outside the utmost point post for the second holding tank can be opened 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, can realize the storage arrangement to electrically conductive portion through the notch of second holding tank easily, and can realize the electric connection operation etc. to electrically conductive portion and utmost point post through the notch of second holding tank easily, and then can reduce the single production degree of difficulty of battery, improve single production efficiency of battery.
In some embodiments, the housing comprises a housing body and a housing cover, the housing body having an opening; the number of the openings is one, the shell cover is covered on the openings, and the bracket is positioned at one end of the battery cell component far away from the openings; or the number of the openings is two, each opening is covered with a shell cover, and the bracket is positioned at one end of the battery cell component, which is far away from any one opening. One part of the insulating piece can be pressed between the wall of the shell opposite to one opening and the corresponding support, and the other part of the insulating piece can be pressed between the wall of the shell opposite to the other opening and the corresponding support, so that the risk of falling off of the insulating piece is further reduced, the risk of failure of the battery cell assembly due to naked leakage is reduced, the risk of corrosion of the shell is reduced, and the reliability and stability of the battery cell are improved.
In the technical scheme, the shell is provided with the opening, the support is arranged at one end of the battery cell assembly, which is far away from the opening, the battery cell assembly with the support and the insulating part is only installed in the shell from the opening, the installation efficiency is improved, the shell cannot scrape the edge of the insulating part, the connecting position between the insulating part and the support cannot be scraped, the connection reliability between the insulating part and the support is improved, the risk of falling of the insulating part is reduced, the risk of corrosion of the shell caused by bare leakage of the battery cell assembly is reduced, the risk of failure of the battery cell assembly is reduced, the risk of liquid leakage is reduced, and the reliability and the stability of the battery cell are improved. The battery cell assembly is characterized in that two openings are formed in the shell, a support is arranged at one end, far away from any one opening, of the battery cell assembly, the battery cell assembly with the two supports and the insulating piece can be installed in the shell from any one opening, the proper shell entering direction can be selected according to the needs, after the battery cell assembly is installed in place in the shell, one part of the insulating piece can be pressed between the wall, opposite to one opening, of the shell and the corresponding support, the other part of the insulating piece can be pressed between the wall, opposite to the other opening, of the shell and the corresponding support, the risk that the insulating piece falls off is further reduced, the risk that the battery cell assembly fails due to naked leakage is reduced, meanwhile, the risk that the shell is corroded is reduced, and the reliability and stability of a battery cell are improved.
In some embodiments, at least one pole is provided on a wall of the housing adjacent one side of the bracket. In the technical scheme, the battery cell assembly with the support and the insulating piece enters the shell along the opening, and the conductive part is directly opposite to the pole, so that the conductive part can be easily connected with the pole, and the assembly efficiency of the battery cell is improved.
In a second aspect, the present application provides a battery comprising the battery cell of the above embodiment.
In the above technical scheme, because the battery sets up foretell battery monomer, and because be connected the wall of keeping away from the electric core subassembly with at least a portion of insulating part and support, can improve the connection reliability between insulating part and the support, reduce the risk that insulating part drops, and then can reduce the casing and leak the risk that is corroded because of electric core subassembly is naked, reduce the risk that electric core subassembly self became invalid, and reduce the risk of weeping, then can improve the reliability and the stability of battery.
In a third aspect, the present application provides an electrical device comprising a battery according to the above embodiments.
In the above technical scheme, the battery is arranged in the power utilization device, and the working reliability and stability of the power utilization device can be improved because the working reliability and stability of the battery can be improved.
The foregoing description is only an overview of the present application, and is intended to be implemented in accordance with the teachings of the present application in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present application more readily apparent.
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 illustration of a battery provided in some embodiments of the present application;
fig. 4 is a structural cross-sectional view of a battery cell according to some embodiments of the present application;
fig. 5 is a cross-sectional view of a battery cell assembly, a bracket, and an insulator of some embodiments of the present application;
Fig. 6 is an assembly view of a battery cell according to some embodiments of the present application;
fig. 7 is an assembly view of a battery cell according to other embodiments of the present application;
fig. 8 is a top view of a battery cell according to some embodiments of the application;
fig. 9 is a top view of a battery cell according to other embodiments of the application;
fig. 10 is a top view of a battery cell according to still other embodiments of the present application;
fig. 11 is a schematic view illustrating an insulating member of a battery cell according to some embodiments of the present application in an unfolded state;
fig. 12 is a schematic view showing the structure of an insulating member of a battery cell according to other embodiments of the present application in an unfolded state;
fig. 13 is a schematic view showing the structure of an insulating member of a battery cell according to still other embodiments of the present application in an unfolded state;
fig. 14 is a schematic view showing the structure of an insulating member of a battery cell according to still other embodiments of the present application in an unfolded state;
fig. 15 is a schematic view illustrating a structure of an insulating member of a battery cell in a wrapped state according to some embodiments of the present application;
fig. 16 is a structural cross-sectional view of the battery cell shown in fig. 15;
fig. 17 is a schematic view of the structure of an insulating member of a battery cell before wrapping a cell assembly according to some embodiments of the present application;
fig. 18 is a schematic structural view of a bracket of a battery cell according to some embodiments of the present application;
Fig. 19 is a schematic structural view of a bracket for a battery cell according to other embodiments of the present 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 structural cross-sectional view of a holder for a battery cell according to some embodiments of the present application;
fig. 22 is a top view of a bracket for a battery cell according to some embodiments of the application;
FIG. 23 is a top view of a bracket for a battery cell according to other embodiments of the application;
fig. 24 is a front view of a battery cell according to some embodiments of the application;
fig. 25 is a front view of a battery cell according to other embodiments of the present application;
fig. 26 is a partial structural cross-sectional view of a battery cell according to some embodiments of the present application;
fig. 27 is a partial structural cross-sectional view of a battery cell according to other embodiments of the present application;
fig. 28 is a partial structural sectional view of a battery cell according to still other embodiments of the present application;
fig. 29 is a partial structural sectional view of a battery cell according to still other embodiments of the present application;
FIG. 30 is a schematic view, partially in section, of a battery cell provided in some embodiments of the application;
FIG. 31 is a schematic partial cross-sectional view of a battery cell according to some embodiments of the present application;
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 structural exploded view of the battery cell shown in fig. 35;
FIG. 37 is an exploded view of the first cover plate shown in FIG. 36;
FIG. 38 is a schematic partial cross-sectional view of a battery cell provided in some embodiments of the application;
fig. 39 is a structural exploded view of the battery cell shown in fig. 38.
Reference numerals:
the power consumption device 1000, the battery 100, the controller 200, the motor 300,
a first direction Z, a second direction X, a third direction Y, an axial direction R of the pole,
the battery cell 10, the case 20, the first case 201, the second case 202,
housing 11, housing 111, opening 1110, mounting wall 1112, housing cover 112, first housing cover 1121, second housing cover 1122, mounting hole 113,
the pole 12, the receiving portion 121, the first receiving groove 12110, the first end wall 12111, the first countersink 12112, the first side wall 12113, the second receiving groove 12120, the second end wall 12121, the second countersink 12122, the second side wall 12123, the first groove section 12124, the second groove section 12125, the guide slope 12126, the step surface 12127, the through hole 12130, the pole inner end surface 122, the pole outer end surface 123, the first groove 126, the spacer 127,
The first cover plate 13, the first conductive member 131, the second groove 1311, the second conductive member 132, the stress relief groove 133,
the second cover plate 14 is provided with a first cover plate,
the cell assembly 2, the first end 201, the second end 202, the active material coating portion 21, the conductive portion 22,
bracket 3, via hole 311, guide groove 312, guide part 32, first bracket 33, second bracket 34, limit protrusion 38, first surface 381, second surface 382, clearance part 391, first injection guide groove 392, accommodation groove 393,
the insulating material 4, the connection mark 401, the first dividing line 401a, the second dividing line 401b, the third dividing line 401c, the main body insulating portion 41, the main body portion 410, the first main body portion 411, the first main body face 4111, the first flange 4112, the second flange 4113, the second main body portion 412, the second main body face 4121, the third flange 4122, the fourth flange 4123, the first insulating portion 42, the center line 42a, the second insulating portion 43, the insulating portion 430, the main face 431, the dividing face 432, the score 44,
a slot cover 7.
Detailed Description
Embodiments of the technical scheme of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present application, and thus are merely examples, and are not intended to limit the scope of the present 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 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.
In the description of embodiments of the present application, the technical terms "first," "second," and the like are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.
Reference herein 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. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
In the description of the embodiments of the present application, the term "and/or" is merely an association relationship describing an association object, and indicates that three relationships may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated 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 description of the embodiments of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like should be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; or may be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to specific circumstances.
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 application is 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. The battery module generally includes a plurality of battery cells. The battery pack generally comprises a box body and one or more battery cells arranged in the box body, or the battery pack comprises a box body and one or more battery modules arranged in the box body, and the box body can avoid liquid or other foreign matters from affecting the charging or discharging of the battery cells.
For example, a battery cell may generally include a case for accommodating the electrode assembly and the electrolyte, the case having at least one positive electrode tab and at least one negative electrode tab disposed thereon. The electrode assembly is formed by laminating or winding a positive electrode plate, a negative electrode plate and a separation film. The positive electrode sheet may generally include a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer is directly or indirectly coated on the positive electrode current collector, the positive electrode current collector without the positive electrode active material layer protrudes 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 serves as a positive electrode tab, and a plurality of positive electrode tabs are stacked together and electrically connected with the 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 being a negative electrode tab, the plurality of negative electrode tabs being stacked together and electrically connected to the negative electrode tab. The material of the separator is not limited, and may be, for example, polypropylene or polyethylene.
Meanwhile, the battery cell mainly depends on metal ions to move between the positive electrode plate and the negative electrode plate 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.
Currently, the application of power batteries is more widespread from the development of market situation. The power battery is not only applied to energy storage power supply systems such as hydraulic power, firepower, wind power and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric automobiles, and the like, and a plurality of fields such as military equipment, aerospace, and the like. With the continuous expansion of the application field of the power battery, the market demand of the power battery is also continuously expanding.
In the related art, the battery monomer generally includes having open-ended casing, top cap, electric core subassembly, insulating part and plastic part, and electric core subassembly sets up in the casing, is equipped with the utmost point post on the top cap, and electric core subassembly is connected with utmost point post electricity, and the plastic part sets up in the top cap one side that is close to the utmost point post to provide insulation, the insulating part cladding is in electric core subassembly's the bottom that deviates from the top cap to and electric core subassembly's week side, and is connected with the plastic part, in order to guarantee insulating between electric core subassembly and the casing, thereby guarantee battery charge-discharge process's normal clear.
However, the inventor finds that in the process of loading the battery cell assembly with the structure into the shell, the insulating part is easy to wrinkle and edge rolling in the process of friction with the shell, and even is easy to separate from the plastic part, so that the battery cell assembly is exposed, the battery cell assembly is in contact with the inner wall surface of the shell, the shell is corroded, and the use reliability of the battery cell is affected.
In view of the above, the present application provides a battery cell, in which a bracket is disposed at one end of a battery cell, an insulating member is matched with the bracket and covers the battery cell together, and at least a portion of the insulating member is connected with a wall surface of the bracket, which is far away from the battery cell, so as to reduce the pulling of the housing on the connection position between the insulating member and the bracket during the process of housing the battery cell, thereby reducing the movement and sliding of the insulating member during the process of housing the battery cell, improving the connection reliability between the insulating member and the bracket, reducing the risk of falling of the insulating member, further reducing the risk of corrosion of the housing due to bare leakage of the battery cell, reducing the risk of failure of the battery cell, and further improving the reliability and stability of the battery cell.
The battery cell disclosed by the embodiment of the application can be used for an electric device using a battery as a power supply or various energy storage systems using the battery as an energy storage element. The power device may be, but is not limited to, a cell phone, tablet, notebook computer, electric toy, electric tool, battery car, electric car, ship, spacecraft, etc. 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.
Taking a power utilization device as an example of a vehicle, the structures of the battery cell, the battery and the power utilization device provided by the embodiment of the application are described in detail.
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 vehicle is provided with a battery 100, and the battery 100 may be provided at the bottom or at the head or at 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 accommodating 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 accommodating space for accommodating the battery cell 10. The second case 202 may have a hollow structure with an opening at one end, the first case 201 may have a plate-shaped structure, and the first case 201 covers the opening side of the second case 202, so that the first case 201 and the second case 202 together define an assembly space; alternatively, the first case 201 and the second case 202 may each have a hollow structure (for example, as shown in fig. 2) with one side opened, and the opening side of the first case 201 may be closed to the opening 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, or the like.
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; alternatively, the battery 100 may be a battery module formed by connecting a plurality of battery cells 10 in series, parallel or series-parallel connection, and then connecting a plurality of battery modules in series, parallel or series-parallel connection to form a whole and be accommodated in the case 20. The battery 100 may further include other structures, for example, the battery 100 may further include a bus bar member 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 present application, in which the battery cell 10 is rectangular, the height direction of the battery cell 10 is a first direction Z, the length direction of the battery cell 10 is a second direction X, and the thickness direction of the battery cell 10 is a third direction Y. The first direction Z, the second direction X and the third direction Y are perpendicular to each other. Of course, in other embodiments of the present application, the battery cell 10 may also have a cylindrical shape, a flat shape, or other shapes, which is not limited in this embodiment.
Referring to fig. 4 and 5, fig. 4 is a cross-sectional view illustrating a structure of a battery cell 10 according to some embodiments of the application. Fig. 5 is a cross-sectional view of the assembled battery cell assembly 2, the bracket 3, and the insulator 4 of the battery cell 10 according to some embodiments of the present application. In the embodiment of the application, the battery cell 10 comprises a shell 11, a battery cell assembly 2, a bracket 3 and an insulating piece 4.
The shape of the housing 11 is adjusted according to the type of the battery cell 10, and the type of the battery cell 10 in the embodiment of the application is not limited, for example, when the battery cell 10 is a square battery, the housing 11 is square, and when the battery cell 10 is a cylindrical battery, the housing 11 is cylindrical, and the embodiment of the application is described taking the housing 11 as the square. Meanwhile, a pole 12 is arranged on the shell 11, and the pole 12 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 poles is four, two positive poles and two negative poles may be used, and at this time, the two positive poles are electrically connected to the positive output position of the battery cell assembly 2, and the two negative poles are electrically connected to the negative output position of the battery cell assembly 2. The casing 11 may further be provided with a pressure release mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 10 reaches a threshold value, where the pressure release mechanism can release pressure when the internal pressure or temperature of the battery cell 10 is too high, so as to prevent thermal runaway from being transferred to other battery cells 10.
Also, in the embodiment of the present application, the housing 11 specifically includes a housing body 111 and a housing cover 112.
The housing 111 has a semi-closed structure having an opening 1110 at one end, or has a ring-shaped structure having an opening 1110 at both ends. Meanwhile, the case 111 may have various shapes and various sizes, such as a rectangular parallelepiped shape, a cylindrical shape, a hexagonal prism shape, etc., and the shape of the case 111 may be determined according to the specific shape and size of the cell assembly 2. Moreover, the material of the housing 111 may be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in the embodiment of the present application. The housing 111 has openings 1110, and the number of openings 1110 may be one or more.
The case cover 112 refers to a member that is covered at the opening 1110 of the case body 111 to isolate the internal environment of the battery cell 10 from the external environment. And, the number of the shell covers 112 is identical to the number of the openings 1110, when the number of the openings 1110 is one, the number of the shell covers 112 is also one, and the openings 1110 are covered by the shell to close the openings 1110, and when the number of the openings 1110 is two, the number of the shell covers 112 is two, and the two openings 1110 are respectively covered by the shell to close the corresponding openings 1110. The cover 112 and the body 111 may be formed with a common connection surface before other components are inserted into the housing, and when the interior of the body 111 needs to be sealed, the cover 112 is then closed to the body 111. Meanwhile, the shape of the case cover 112 may be adapted to the shape of the case body 111 to fit the case body 111. Alternatively, the cover 112 may be made of a material having a certain hardness and strength (such as an aluminum alloy), so that the cover 112 is not easy to deform when being extruded and bumped, so that the battery cell 10 can have a higher structural strength, and the safety performance can be improved. The cover 112 may be provided with functional components such as the pole 12. The material of the cover 112 may be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in the embodiment of the present application.
The housing 11 is provided with a plurality of poles 12, and the plurality of poles 12 may be disposed on the housing body 111, may be disposed on the housing cover 112, or may be disposed on the housing body 111 partially or on the housing cover 112 partially. The following embodiments of the present application will be described by taking the case 111 as a square shape, the number of openings 1110 of the case 111 as one, and the number of poles 12 as two, namely, a positive pole and a negative pole, respectively, and both poles 12 are disposed on the wall of the case 111 opposite to the openings 1110 as an example. Of course, in other embodiments of the present application, the shape of the housing 111, the number of openings 1110 and the housing cover 112, the number of poles 12, and the positions of the poles 12 can be adjusted according to the requirements, and the embodiments of the present application are not limited thereto.
In the embodiments of the present application, please refer to fig. 4 and 5, and further refer to fig. 6, fig. 6 is an assembly diagram of the battery cell 10 according to some embodiments of the present application. In the embodiment of the present application, the bracket 3 is provided at one end of the cell assembly 2. When the battery cell 10 is assembled, the bracket 3 may be disposed at one end of the battery cell assembly 2, and then the battery cell assembly 2 with the bracket 3 is installed into the housing 11, so that the bracket 3 enters the housing 111 from the opening 1110 of the housing 111, then the battery cell assembly 2 enters the housing 111, and after the battery cell assembly 2 is installed in place in the housing 111, the bracket 3 is located on the wall of the housing 111 opposite to the opening 1110 thereof and one end of the battery cell assembly 2 away from the opening 1110.
Referring to fig. 6 again, when the opening 1110 of the housing 111 is one, the bracket 3 is specifically disposed at an end of the cell assembly 2 away from the opening 1110. The opening 1110 may be located in the top wall, bottom wall or side wall of the housing 111. When the opening 1110 is located on the bottom wall of the shell 111, the other walls are of closed structures, the battery cell assembly 2 with the support 3 and the insulating member 4 can only be installed into the shell 111 from the opening 1110, after the battery cell assembly 2 is installed in place in the shell 111, the shell cover 112 is covered at the opening 1110 to seal the opening 1110, the insulating member 4 is pressed between the top wall of the shell 111 and the support 3, so that the falling risk of the insulating member 4 can be reduced, the failure risk of the battery cell assembly 2 due to bare leakage is reduced, the corrosion risk of the shell 11 is reduced, and the reliability and stability of the battery cell 10 are improved.
In the above technical scheme, set up an opening 1110 on shell 111 to set up the support 3 in the one end that the opening 1110 was kept away from to electric core subassembly 2, have support 3, electric core subassembly 2 of insulating part 4 can only be packed into shell 111 from this opening 1110, it is unique to go into the shell direction, be favorable to improving installation effectiveness, and shell 11 can not scrape the edge of insulating part 4, can not scrape the hookup location between insulating part 4 and the support 3 yet, can improve the connection reliability between insulating part 4 and the support 3, reduce the risk that insulating part 4 drops, and then can reduce electric core subassembly 2 and make the risk that shell 11 corroded because of naked the leakage, reduce the risk that electric core subassembly 2 self became invalid, and reduce the risk of weeping, then perhaps improve the reliability and the stability of battery monomer 10.
Referring to fig. 6 again, in the embodiment of the present application, on the premise that an opening 1110 is provided on the housing 111, all the poles 12 may be provided on the end wall of the housing 111 opposite to the opening 1110, so that the conductive portion 22 may penetrate from the bracket 3 and be correspondingly electrically connected to the poles 12 on the end wall of the housing 111. In other embodiments of the present application, all the poles 12 may be disposed on the housing cover 112, that is, all the poles 12 are located on the side of the battery module 2 away from the support 3, and the conductive portion 22 may be electrically connected to the poles 12 on the housing cover 112 correspondingly. Alternatively, in other embodiments of the present application, one of the poles 12 may be provided on the housing cover 112, the other pole 12 may be provided on an end wall of the housing 111 opposite to the opening 1110, and one of the conductive portions 22 may be electrically connected from the pole 12 on the housing cover 112.
Specifically, referring to fig. 6 again, in the embodiment of the present application, on the premise that an opening 1110 is provided in the housing 111, an end wall of the housing 111 opposite to the opening 1110 is defined as a mounting wall 1112, and all the poles 12 are provided on the mounting wall 1112. Through this structure setting for when carrying out the assembly of battery monomer 10, electric core subassembly 2 can get into shell 111 along opening 1110, and makes electrically conductive portion 22 direct and utmost point post 12 relatively, thereby can make electrically conductive portion 22 can be connected with utmost point post 12 relatively easily, in order to can fully improve the assembly efficiency of battery monomer 10.
It should be noted that, in the embodiment of the present application, the mounting wall 1112 is specifically a top wall of the housing 111 (i.e., an end closer to the bus bar of the battery), and a bottom wall of the housing 111 (i.e., an end far from the bus bar of the battery) has an opening 1110. By this arrangement, on the one hand, 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 Z direction, so that the conductive portion 22 can be easily connected to the pole 12. On the other hand, the pulling of the converging part to the shell 111 is not easy to concentrate at the matching position of the shell 111 and the shell cover 112, and the matching position of the converging part and the shell cover 112 is not easy to crack, so that the reliability and the stability of the battery cell 10 are effectively improved.
Referring to fig. 7, fig. 7 is an assembly view of a battery cell 10 according to another embodiment of the application. In other embodiments of the present application, the number of the openings 1110 on the housing 111 may be two, and one cover 112 is covered at each opening 1110. With this structure, the bracket 3 is specifically disposed at an end of the cell assembly 2 away from any one of the openings 1110.
By this arrangement, when the battery cell 10 is assembled, the battery cell assembly 2 with the brackets 3 and the insulating member 4 can be installed into the housing 111 from any one of the openings 1110, after the battery cell assembly 2 is installed in place in the housing 111, the two housing covers 112 are respectively covered at the two openings 1110 to seal the corresponding openings 1110, after the battery cell assembly 2 with the two brackets 3 is put into the housing, one of the conductive parts 22 is penetrated out from one of the brackets 3 and electrically connected with the post 12 on the corresponding housing cover 112, and the other conductive part 22 is penetrated out from the other bracket 3 and electrically connected with the post 12 on the corresponding housing cover 112.
Specifically, referring again to fig. 7, when the number of the openings 1110 on the housing 111 is two, the two openings 1110 may be located on the top wall, the bottom wall or the side wall of the housing 111, or even the two openings 1110 may be located on two opposite walls of the housing 111. As shown in fig. 7, the two openings 1110 may be specifically disposed on the top wall and the bottom wall of the housing 111, and in other embodiments, the two openings 1110 may also be disposed on two opposite sidewalls of the housing 111, or may also be disposed on two adjacently disposed walls of the housing 111, which will not be described herein.
When two openings 1110 are respectively provided on two opposite walls of the housing 111, the remaining walls are all of a closed structure, wherein one opening 1110 is covered with a first housing cover 1121, and the other opening 1110 is covered with a second housing cover 1122. At this time, all the poles 12 may be provided on the first cover 1121, or all the poles 12 may be provided on the second cover 1122, or some of the poles 12 may be provided on the first cover 1121 or the second cover 1122, and some of the poles 12 may be provided on the case 111.
For example, referring to fig. 7 again, when the number of the openings 1110 is two, the two openings 1110 may be a first opening and a second opening which are disposed opposite to each other, the first housing cover 1121 and the second housing cover 1122 are respectively provided with a pole 12, two ends of the battery cell assembly 2 are respectively provided with a bracket 3, and when the battery cell 10 is assembled, the battery cell assembly 2 with the bracket 3 may be first installed into the housing 11, so that the bracket 3 first enters the housing 111 from the first opening of the housing 111 and moves towards the second opening, then the battery cell assembly 2 enters the housing 111, and after the battery cell assembly 2 is installed in place in the housing 111, the bracket 3 is located at the second opening.
In the above technical solution, two openings 1110 are provided on the housing 111, and a support 3 is provided at one end of the cell assembly 2 away from any one opening 1110, the cell assembly 2 with two supports 3 and an insulating member 4 can be installed into the housing 111 from any one opening 1110, a suitable shell-in direction can be selected according to needs, in the shell-in process, the support 3 can facilitate the leading of the cell assembly 2 into the shell, so as to ensure assembly efficiency, after the cell assembly 2 is installed in place in the housing 111, a part of the insulating member 4 can be pressed between a wall of the housing 111 opposite to one of the openings 1110 and the corresponding support 3, another part of the insulating member 4 can be pressed between a wall of the housing 111 opposite to the other opening 1110 and the corresponding support 3, so that the risk of the insulating member 4 falling off is further reduced, the risk of failure of the cell assembly 2 due to bare leakage is reduced, and meanwhile, the risk of the housing 11 being corroded is reduced, and reliability and stability of the battery cell 10 are improved.
At the same time, the housing 11 is provided with at least one pole 12 on the housing wall on the side adjacent to the support 3. The battery cell assembly 2 with the bracket 3 and the insulating piece 4 enters the shell 111 along the opening 1110, and the conductive part 22 is directly opposite to the pole 12, so that the conductive part 22 can be easily connected with the pole 12, and the assembly efficiency of the battery cell 10 is improved.
Referring to fig. 5 again, in the embodiment of the application, the insulating member 4 is matched with the bracket 3, and both of them jointly cover the battery cell assembly 2. Since the holder 3 is provided at one end of the cell assembly 2, the insulating member 4 may cover the cell assembly 2 from the remaining several sides of the cell assembly 2 so that the entire circumference of the cell assembly 2 can be insulated from the case 11. That is, the insulating member 4 can improve the insulation reliability between the battery cell assembly 2 and the housing 11, reduce or prevent the corrosion of the housing 11 caused by the contact between the battery cell assembly 2 and the housing 11, reduce the leakage problem of the electrolyte caused by the corrosion of the housing 11, and improve the reliability of the battery cell 10.
Meanwhile, fig. 8 is a top view of a battery cell according to some embodiments of the present application. Fig. 9 is a top view of a battery cell according to other embodiments of the application. Fig. 10 is a top view of a battery cell according to still other embodiments of the application. Referring to fig. 8 to 10, in the embodiment of the present application, the insulating member 4 is mated with the support 3, and at least a portion of the insulating member 4 may be connected to a wall surface of the support 3 away from the battery cell assembly 2. Referring to fig. 6 again, for convenience of description, it may be defined that the battery cell assembly 2 has a first end 201 and a second end 202 that are disposed opposite to each other, the bracket 3 may be disposed at the first end 201 of the battery cell assembly 2, and the insulating member 4 may be connected to a wall surface of the bracket 3, which is far away from the first end 201 of the battery cell assembly 2, so that a connection position between the insulating member 4 and the bracket 3 is located on the wall surface of the bracket 3, which is far away from the first end 201 of the battery cell assembly 2, and an edge of the insulating member 4, which is near the first end 201 of the battery cell assembly 2, is located on the wall surface of the bracket 3, which is far away from the first end 201 of the battery cell assembly 2.
According to the technical scheme, at least one part of the insulating piece 4 is connected with the wall surface, far away from the battery cell assembly 2, of the support 3, on one hand, in the process of loading the battery cell assembly 2 with the support 3 into the shell 11, the shell 11 is not easy to scratch to the connection position between the insulating piece 4 and the support 3, the connection position between the insulating piece 4 and the support 3 is not easy to pull open in the shell loading process, the play and sliding of the insulating piece 4 in the shell loading process of the battery cell assembly 2 can be reduced, the connection reliability between the insulating piece 4 and the support 3 can be improved, the falling risk of the insulating piece 4 is reduced, the corrosion risk of the shell 11 due to bare leakage of the battery cell assembly can be reduced, the failure risk of the battery cell assembly 2 is reduced, the leakage risk is reduced, and the reliability and stability of the battery cell 10 can be improved; meanwhile, compared with the connection of the insulating part 4 and the peripheral side of the battery cell assembly 2, the insulating part 4 is matched with the bracket 3, so that the insulating part 4 is originally adjacent to four surfaces of the peripheral side of the shell 11, the probability that the matching position of the insulating part 4 and the bracket 3 is interfered for being adjacent to one surface of one end of the shell 11 is greatly reduced, the reliability and the stability of the insulating part 4 can be further improved, and the reliability and the stability of the battery cell 10 can be improved; in addition, at least a part of the insulating piece 4 is connected with the wall surface of the bracket far away from the battery cell assembly 2, so that the insulating piece 4 can be designed to be longer in size, the battery cell assembly 2 with different sizes can be suitable, the compatibility is higher, and the manufacturability can be improved. On the other hand, after the bracket 3 and the cell assembly 2 are installed in place in the housing 11, the insulating member 4 is pressed between the wall surface of the housing 11 opposite to the opening 1110 and the bracket 3, so that the risk of falling off of the insulating member 4 can be further reduced, the risk of failure of the cell assembly 2 due to bare leakage is reduced, the risk of corrosion of the housing 11 is reduced, and the reliability and stability of the battery cell 10 are improved.
In addition, since the pole 12 is disposed at the position of the shell 111 opposite to the opening 1110, and the position where the insulator 4 is matched with the bracket 3 is located at one side of the bracket 3 away from the battery cell assembly 2, if the insulator 4 is located at the circumferential part of the battery cell assembly 2 and contacts the shell 111, the shell 111 will gradually straighten out the insulator 4, so that the insulator 4 is not easy to pile up or pleat, the insulation effect between the battery cell assembly 2 and the shell 11 is more stable, and the reliability and stability of the battery cell 10 can be further improved.
Referring to fig. 8 to 10 again, in the embodiment of the present application, the insulating member 4 and the holder 3 are connected at annular intervals in the circumferential direction away from the wall surface of the cell assembly 2, that is, the insulating member 4 and the holder 3 are connected at a plurality of connection positions, and the plurality of connection positions are arranged at intervals in the circumferential direction of the holder 3. On the basis of ensuring the connection reliability and stability between the insulating piece 4 and the bracket 3 in the circumferential direction of the bracket 3, the connecting material can be saved, the material cost can be reduced, the connecting step can be simplified, and the production efficiency can be improved.
Of course, in other embodiments of the present application, the insulating member 4 and the wall surface of the bracket 3 away from the cell assembly 2 may be continuously connected in a circumferential annular shape. The annular connection here means that the connection position of the insulator 4 with the bracket 3 extends in the circumferential direction of the bracket 3 to form a closed annular shape. So set up, can increase the area of connection of insulating part 4 and support 3 to improve the connection reliability and the steadiness of insulating part 4 and support 3 between support 3 in the circumference of support 3, further reduce the risk that insulating part 4 drops, and then improve the reliability that electric core subassembly 2 goes into the shell, guarantee the reliability and the stability of battery monomer 10.
In addition, in other embodiments of the present application, the connection positions between the insulating member 4 and the support 3 may be concentrated on two opposite sides, two adjacent sides or multiple sides of the support 3, and specifically may be selected according to the actual shapes of the cell assembly 2 and the support 3, which is not limited herein.
Referring to fig. 8-10 again, in the embodiment of the application, the connection mode between the insulating member 4 and the support 3 may be a hot-melt connection, and the wall surface of the insulating member 4, which is far away from the cell assembly 2, and the support 3 are hot-melt connected to form the connection mark 401, and the position of the connection mark 401 is not limited by space.
Specifically, in the embodiment of the present application, the number of the connection marks 401 is plural, and the plural connection marks 401 are arranged at intervals around the circumference of the wall surface of the holder 3 away from the cell assembly 2. In other embodiments of the present application, the connection stamp 401 may also extend annularly around the circumference of the wall surface of the bracket 3 away from the cell assembly 2, so as to make the connection between the insulating member 4 and the bracket 3 stronger, so as to substantially improve the connection reliability between the insulating member 4 and the bracket 3 and reduce the risk of the insulating member 4 falling off.
In the embodiment of the present application, the shape of the connection mark 401 may be rectangular, circular, oval, or the like, or may be irregular. The arrangement of the plurality of connection marks 401 may be selected according to the actual shapes of the cell assembly 2 and the holder 3. For example, when the cross-sectional shapes of the cell assembly 2 and the holder 3 are square or rectangular, the plurality of connection marks 401 may be distributed near four edges of the holder 3 or may be concentrated near opposite side edges of the holder 3. For another example, when the cross-sectional shapes of the cell assembly 2 and the holder 3 are circular, the plurality of connection marks 401 may be uniformly distributed around the circumference of the wall surface of the holder 3 away from the cell assembly 2.
Of course, the distribution form of the plurality of connection marks 401 is not limited to the above form, and the distance between two adjacent connection marks 401 can be adjusted as required, so that the number of connection marks 401 can be appropriately increased, and on the basis of ensuring the connection reliability of the insulating member 4 and the bracket 3, the material is saved, and the cost is reduced.
Taking the cell assembly 2 as a cuboid for illustration, in the embodiment of the application, the bracket 3 may be a rectangular plate with a corresponding shape, the bracket 3 is disposed on one wall surface of the cell assembly 2, and the insulating member 4 wraps the remaining five wall surfaces of the cell assembly 2 in the circumferential direction, so as to ensure the insulating effect between the cell assembly 2 and the housing 11. Meanwhile, the connection marks 401 formed by the insulating member 4 and the wall surface of the holder 3 far from the cell assembly 2 may be disposed adjacent to the circumferential edge of the holder 3, and may be adjacent to two edges, three edges or four edges of the circumference of the holder 3, and the number of connection marks 401 formed by the insulating member 4 and the vicinity of the corresponding edges may be increased or decreased according to the size of the corresponding edges, which is not limited in the embodiment of the present application.
In the technical scheme, on one hand, the insulating part 4 is connected in a hot melting mode, so that the insulating part 4 can be conveniently matched with the bracket 3, the assembly efficiency is improved, the shell-entering efficiency of the battery cell assembly 2 is ensured, and the assembly and manufacturing cost is saved; on the other hand, whether the connection marks 401 extend in a circumferential annular shape or are arranged at intervals in the circumferential direction, the connection firmness between the insulating piece 4 and the bracket 3 can be improved, and the connection reliability and stability of the insulating piece 4 and the bracket 3 are improved, so that the risk of falling off of the insulating piece 4 is sufficiently reduced; meanwhile, compared with circumferential annular extension, the circumferential interval arrangement can save materials and reduce cost on the basis of ensuring the connection reliability of the insulating piece 4 and the bracket 3.
Referring to fig. 4 and 5 again, referring to fig. 3 to 5 again, in the embodiment of the present application, the battery module 2 specifically includes an active material coating portion 21 and a conductive portion 22, the active material coating portion 21 is accommodated in the housing 11, the active material coating portion 21 is a portion of the battery module 2 coated with active material, the active material coating portion can assist in removing metal ions during charging and discharging of the battery cell 10, and the conductive portion 22 is a metal structure electrically connecting the active material coating portion 21 and the terminal 12, which is not coated with active material. Meanwhile, the conductive part 22 is connected to a side of the active material coating part 21 near the holder 3, the conductive part 22 extends toward the pole 12, and the conductive part 22 is connected to the pole 12, so that the charge and discharge operation of the battery cell 10 can be performed. The insulator 4 is coated on the active material coating portion 21 in the circumferential direction, specifically, together with the stent 3. That is, in the cell assembly 2, except for the conductive portion 22 extending out of the holder 3 to be connected to the pole 12, the remaining surfaces are collectively covered with the insulating member 4 and the holder 3.
In the above technical solution, the insulating member 4 and the bracket 3 jointly cover the circumference of the active material coating portion 21, so that, on one hand, the active material coating portion 21 can be completely separated from the housing 11, the exposure of the active material coating portion 21 is reduced, the risk of failure and damage of the cell assembly 2 is reduced, the reliability and stability of the battery cell 10 are improved, and on the other hand, the size of the insulating member 4 can be reduced, and the cost of the insulating member 4 is saved; at the same time, the insulating member 4 can be stabilized and protected by the bracket 3 to sufficiently secure the reliability and stability of the battery cell 10.
In the embodiment of the present application, the active material coating portion 21 is divided into a positive electrode active material coating portion including a portion where the positive electrode current collector is coated with the positive electrode active material layer and a negative electrode active material coating portion including a portion where the negative electrode current collector is 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.
Referring to fig. 11-13, fig. 11 is a schematic structural view illustrating an insulating member of a battery cell according to some embodiments of the application in an unfolded state. Fig. 12 is a schematic view illustrating an insulating member of a battery cell according to still other embodiments of the present application in an unfolded state.
Fig. 11 is a schematic view illustrating an insulating member of a battery cell according to still another embodiment of the present application in an unfolded state. Fig. 13 is a schematic view illustrating an insulating member of a battery cell according to still another embodiment of the present application in an unfolded state. In the embodiment of the present application, the insulating member 4 has a spread state and a covered state, when the insulating member 4 is in the spread state, the insulating member 4 does not cover the cell assembly 2, the insulating member 4 has a planar structure, and when the insulating member 4 is in the covered state, the insulating member 4 and the holder 3 together cover the circumference of the active material coating portion 21. Through setting the expansion state of insulating part 4 to planar structure, do benefit to the cladding that realizes insulating part 4 to electric core subassembly 2, can be convenient for insulating part 4 to cladding state transition, can improve the assembly convenience of battery monomer 10.
Referring to fig. 15 to 17, fig. 15 is a schematic structural view of an insulating member of a battery cell according to some embodiments of the present application in a wrapped state. Fig. 16 is a structural cross-sectional view of the battery cell shown in fig. 15. Fig. 17 is a schematic view of the structure of an insulating member of a battery cell according to some embodiments of the present application before wrapping the battery cell assembly. In the embodiment of the present application, the insulator 4 includes the main body insulating portion 41, the first insulating portion 42, and the second insulating portion 43, and the first insulating portion 42 and the second insulating portion 43 are provided at both ends of the main body insulating portion 41, respectively. The main body insulating part 41 is wrapped around the peripheral side of the active material coating part 21, the first insulating part 42 is located on the side of the main body insulating part 41 away from the stent 3, and the first insulating part 42 is wrapped around the end of the active material coating part 21 away from the stent 3, the second insulating part 43 is located on the side of the main body insulating part 41 close to the stent 3, and the second insulating part 43 is matched with the stent 3, and the second insulating part 43 and the stent 3 jointly wrap the end of the active material coating part 21 close to the stent 3.
The cross section of the active material coating portion 21 may be circular, rectangular, polygonal, or the like. When the cross section of the active material coating portion 21 is circular, the body insulating portion 41 may be rolled into a shape that is adapted to the shape of the peripheral side (cylindrical surface) of the active material coating portion 21 to wrap the peripheral side of the active material coating portion 21, i.e., the cross section of the body insulating portion 41 is circular in shape. When the cross section of the active material coating portion 21 is rectangular, the main body insulating portion 41 may be folded into a shape that matches the shape of the peripheral side (four side wall surfaces) of the active material coating portion 21 to wrap the peripheral side of the active material coating portion 21, that is, the cross section shape of the main body insulating portion 41 is a rectangular ring shape. When the cross section of the active material coating portion 21 is polygonal, the body insulating portion 41 may be folded into a shape that is adapted to the shape of the peripheral side (side wall surfaces) of the active material coating portion 21 to wrap the peripheral side of the active material coating portion 21, i.e., the cross section shape of the body insulating portion 41 is polygonal ring shape.
Referring to fig. 15 to 17, in a state in which the battery cell 10 is vertically placed, the holder 3 is provided on the upper side of the active material coating portion 21 (the side indicated by the arrow pointing upward in the Z-direction of the active material coating portion 21), and the conductive portion 22 is protruded from the holder 3, the main body insulating portion 41 is wrapped around the peripheral side of the active material coating portion 21, the first insulating portion 42 is wrapped around the lower side of the active material coating portion 21 (the side indicated by the arrow pointing downward in the Z-direction of the active material coating portion 21), and referring again to fig. 8 to 10, the second insulating portion 43 and the holder 3 collectively cover the upper side of the active material coating portion 21. Thus, the insulating member 4 is composed of a plurality of parts, and the plurality of parts can jointly cover the side, the bottom and the top of the active material coating portion 21 with the bracket 3, so that the active material coating portion 21 can be completely separated from the housing 11, the exposure of the active material coating portion 21 can be sufficiently reduced, the risks of failure and damage of the battery cell assembly 2 are reduced, the risk of corrosion of the housing 11 is reduced, and the reliability and stability of the battery cell 10 are improved.
Referring to fig. 11 and 17 again, in the embodiment of the application, the main body insulating portion 41 may include a plurality of main body portions 410, the plurality of main body portions 410 are sequentially connected end to form a ring shape, the plurality of main body portions 410 are commonly wrapped around the peripheral side of the active material coating portion 21, and the first insulating portion 42 and the second insulating portion 43 are respectively located at two ends of the ring structure formed by the plurality of main body portions 410.
Specifically, the number of the main body portions 410 may be two, three, or more, and specifically may be selected according to the shape of the active material application portion 21. For example, the number of the body portions 410 and the number of the surfaces on the peripheral side of the active material application portion 21 may be provided in one-to-one correspondence, that is, the plurality of body portions 410 cover the plurality of surfaces on the peripheral side of the active material application portion in one-to-one correspondence. For another example, the number of the main body portions 410 may be smaller than the number of the peripheral side surfaces of the active material application portion 21, that is, the surface area of at least one main body portion 410 is larger than the surface area of one of the peripheral side surfaces of the active material application portion 21 in the expanded state of the insulator 4, so that two or more peripheral side surfaces of the active material application portion 21 can be covered with the main body portion 410. For another example, the number of the body portions 410 may be greater than the number of the peripheral side surfaces of the active material application portion 21, so that at least a part of the plurality of body portions 410 may be overlapped.
The plurality of body portions 410 are connected to form a ring shape, so that the peripheral side of the active material coating portion 21 can be completely wrapped, the peripheral side of the active material coating portion 21 is completely separated from the inner wall of the case 11, the risk of bare leakage of the active material coating portion 21 is reduced, and the reliability and stability of the battery cell 10 are improved.
Alternatively, in an embodiment of the present application, the connection positions of any adjacent two main body portions 410 have partial overlap. In the above technical solution, on one hand, the connection positions of the main body 410 are overlapped, so that the connection positions are not easy to separate or break, the probability and risk of insulation failure at the overlapped positions can be reduced, and the reliability of the battery cell assembly 2 can be improved, so as to improve the stability and reliability of the battery cell 10; on the other hand, the connecting positions of the main body portion 410 are overlapped, so that the whole insulating member 4 can be fully ensured to be wrapped in the circumferential direction of the active material coating portion 21, the bare leakage of the active material coating portion 21 is fully reduced, and the risk of corrosion of the shell 11 is reduced, so that the reliability and stability of the battery cell assembly 2 and the battery cell 10 are further improved.
Further alternatively, in the embodiment of the present application, the peripheral side of the active material coating portion 21 has a plurality of faces; referring to fig. 13 again, each main body 410 includes a main body surface and two flanges, the two flanges are disposed on two sides of the main body surface, any two adjacent main body 410 are connected by the flanges, and each main body surface and the connection structure of each two flanges respectively wrap different surfaces of the peripheral side of the active material coating portion 21.
Specifically, the peripheral side of the active material application portion 21 may have four faces, six faces, or more, and in an embodiment in which the peripheral side of the active material application portion 21 has four faces, the number of the body portions 410 may be two, the body faces of the two body portions 410 may cover two oppositely disposed faces of the active material application portion 21, the same side edges of the two body portions 410 may be connected together, and the other face of the active material application portion 21 may be covered.
In the embodiment in which the peripheral side of the active material coating portion 21 has six faces, for convenience of description, it may be defined that the peripheral side of the active material coating portion 21 has three first faces and three second faces, which are alternately arranged in the peripheral direction of the active material coating portion, that is, one second face is disposed between two adjacent first faces, one first face is disposed between two adjacent second faces, correspondingly, the number of the body portions 410 may be three, the body faces of the three body portions 410 may cover the three first faces of the active material coating portion 21 arranged at intervals, and the flanges of the two adjacent body portions 410 are connected together, and may cover the second face of the active material coating portion 21.
In the above technical solution, on one hand, any two adjacent main body portions 410 can ensure the reliability of connection through flanging connection, so as to improve the reliability and stability of the battery cell assembly 2 and the battery cell 10; on the other hand, the connection positions of the main body surface and each two flanges respectively wrap different surfaces on the peripheral side of the active material coating portion 21, so that each surface on the peripheral side of the active material coating portion 21 can be effectively wrapped, the reliability of the battery cell assembly 2 can be further improved, and the stability and reliability of the battery cell 10 can be improved.
Referring to fig. 13 again, the widths of the flanges of the plurality of body portions 410 may be equal, or the widths of the flanges of the plurality of body portions 410 may be unequal, for example, as shown in fig. 14, in the present embodiment, the difference between the widths of the flanges on the same side of two adjacent body portions 410 may be L, where L is greater than zero.
More specifically, referring again to fig. 8-10, in some embodiments, the peripheral side of the active material coating portion 21 has four faces, i.e., the cross-sectional outer profile shape of the active material coating portion 21 is quadrilateral.
Referring to fig. 11 and 12 again, the main insulating portion 41 includes two main portions 410, the two main portions 410 are disposed on two sides of the first insulating portion 42, and the two main portions 410 are a first main portion 411 and a second main portion 412 respectively. As shown in fig. 13, the first body 411 includes a first body surface 4111, a first flange 4112 and a second flange 4113, and the first flange 4112 and the second flange 4113 are disposed on two sides of the first body surface 4111, respectively. The second body portion 412 includes a second body surface 4121, a third flange 4122 and a fourth flange 4123, and the third flange 4122 and the fourth flange 4123 are disposed on both sides of the second body surface 4121, respectively.
Referring to fig. 15 and 17, the first flange 4112 is connected to the third flange 4122, the second flange 4113 is connected to the fourth flange 4123, and the connection structure of the first main body surface 4111, the first flange 4112 and the third flange 4122, and the connection structure of the second main body surface 4121, the second flange 4113 and the fourth flange 4123 respectively wrap four surfaces of the active material coating portion 21, which are sequentially arranged in the circumferential direction.
In order to clearly describe the structure of the first body portion 411 and the second body portion 412, four auxiliary lines, that is, four first dividing lines 401a are formed in fig. 13, wherein two first dividing lines 401a divide the first body portion 411 into a first body face 4111, a first flange 4112 and a second flange 4113, and the other two first dividing lines 401a divide the second body portion 412 into a second body face 4121, a third flange 4122 and a fourth flange 4123.
Specifically, when the insulating member 4 is in the expanded state, one end in the width direction of the first body surface 4111 and one end in the width direction of the second body surface 4121 are connected by the first insulating portion 42, one end in the length direction of the first body surface 4111 is provided with the first flange 4112 and the other end is provided with the second flange 4113, that is, the first body surface 4111 separates the first flange 4112 from the second flange 4113, one end in the length direction of the second body surface 4121 is provided with the third flange 4122 and the other end is provided with the fourth flange 4123, that is, the second body surface 4121 separates the third flange 4122 from the fourth flange 4123.
Referring to fig. 8-10 and fig. 15-17 again, when the insulating member 4 is in the coating state, the first flange 4112 is connected to the third flange 4122, the second flange 4113 is connected to the fourth flange 4123, so that the connection structure of the first main body surface 4111, the first flange 4112 and the third flange 4122, the connection structure of the second main body surface 4121, the second flange 4113 and the fourth flange 4123 form a ring structure, and thus the first main body surface 4111 and the second main body surface 4121 can respectively cover two opposite surfaces of the active material coating portion 21, and the connection structure of the first flange 4112 and the third flange 4122, and the connection structure of the second flange 4113 and the fourth flange 4123 can respectively cover the other two opposite surfaces of the active material coating portion 21.
In the embodiment of the present application, the peripheral side of the active material coating portion 21 has four faces, respectively two large faces disposed opposite to each other and two small faces disposed opposite to each other, the first body face 4111 and the second body face 4121 cover the two large faces disposed opposite to each other on the peripheral side of the active material coating portion 21, the first flange 4112 and the third flange 4122 are connected and cover one small face on the peripheral side of the active material coating portion 21, the second flange 4113 and the fourth flange 4123 are connected and cover the other small face on the peripheral side of the active material coating portion 21, the first insulating portion 42 covers the end of the active material coating portion 21 away from the bracket 3, the second insulating portion 43 is engaged with the bracket 3, and the second insulating portion 43 and the bracket 3 jointly cover the end of the active material coating portion 21 near the bracket 3.
When the peripheral side of the active material coating portion 21 has four surfaces, the battery cell 10 is substantially square, and at this time, the first body 411 and the second body 412, and the connection structure thereof can completely cover the four surfaces of the peripheral side of the active material coating portion 21, so that the four surfaces of the peripheral side of the active material coating portion 21 are completely separated from the inner wall of the case, the risk of bare leakage of the active material coating portion 21 is reduced, and the reliability and stability of the square battery cell 10 are sufficiently improved.
Referring to fig. 11-13 again, in some embodiments, the first insulating portion 42 has a center line 42a, the first body 411 and the second body 412 are respectively located on two sides of the center line 42a of the first insulating portion 42, and the first body 411 and the second body 412 are symmetrically disposed or the first body 4111 and the second body 4121 are symmetrically disposed with the center line 42a as a symmetry axis.
Specifically, in the process of wrapping the insulating member 4 on the cell assembly 2, one main body portion 410 of the insulating member 4 may be first covered with one surface of the peripheral side of the active material coating portion 21, then the other main body portion 410 of the insulating member 4 may be covered with the other surface of the peripheral side of the active material coating portion 21, the two main body portions 410 may be used to first cover the two oppositely disposed surfaces of the peripheral side of the active material coating portion 21, and then the subsequent wrapping operation may be performed; the direction can be changed to be coated, the operation is convenient, and the production efficiency is improved.
When the two main body parts 410 are completely symmetrical, the mold opening and the manufacturing of the insulating part 4 are convenient, the cost can be saved, and the production efficiency can be improved; when two main body faces are symmetrically arranged, the flanges of the two main body parts 410 can be asymmetrically arranged, at the moment, the flange of one main body part 410 can be longer, and the flanges of the adjacent main body parts 410 can be shorter, so that the flanges longer than the connecting time of the two main body parts 410 can be wrapped by the flanges shorter than the connecting time of the two main body parts 410, the risk of bare leakage of the active material coating part 21 can be reduced on the basis of saving cost, the risk of corrosion of the shell 11 is reduced, and the reliability and stability of the square battery cell 10 are fully improved.
Of course, in the unfolded state of the insulating member 4, the insulating member 4 may have a non-axisymmetric structure, and the insulating member 4 may be cut according to needs, which is not limited by the embodiment of the present application.
Referring to fig. 11 and fig. 15 to fig. 17 again, in the embodiment of the application, the second insulation portion 43 includes a plurality of insulation portions 430, the plurality of insulation portions 430 are connected to the plurality of main portions 410 in a one-to-one correspondence manner, and any two adjacent insulation portions 430 have partial overlapping.
Specifically, when the insulating member 4 is in the coating state, the plurality of insulating sections 430 of the second insulating portion 43 are located on the wall surface of the support 3 away from the active material coating portion 21, and the plurality of insulating sections 430 are arranged in the circumferential direction of the support 3, and any adjacent two insulating sections 430 are partially overlapped, so that the plurality of insulating sections 430 are connected into the annular second insulating portion 43, and the corrosion phenomenon of the housing 11 caused by the bare leakage of the active material coating portion 21 is effectively reduced.
In the process of loading the battery cell assembly 2 with the bracket 3 into the shell 11, the bracket 3 firstly enters the shell 11, and as the second insulating part 43 is positioned on the wall surface of the bracket 3, which is far away from the active material coating part 21, the insulating part 4 can enter the shell 11 along the shell entering direction, the shell 11 can not scratch the edge of the insulating part 4, and the movement and the sliding of the insulating part 4 are reduced; after the bracket 3 and the cell assembly 2 are installed in place in the housing 11, the second insulating part 43 is pressed between the wall surface of the housing 11 opposite to the opening 1110 and the bracket 3, so that the risk of falling off of the insulating part 4 is further reduced, the phenomenon that the active material coating part 21 corrodes the housing 11 due to bare leakage is reduced, and the installation is convenient.
Referring to fig. 11 again, the widths of the plurality of insulating sections 430 of the second insulating portion 43 may be set to be equal. Referring to fig. 12, the widths of the plurality of insulation sections 430 of the second insulation portion 43 may be set to be unequal, and may be specifically selected according to actual needs.
Referring to fig. 14 again, each insulation part 430 includes a main surface 431 and two sub-surfaces 432, the main surface 431 is connected with the main surface of the corresponding main body portion 410, the two sub-surfaces 432 are respectively connected with two flanges of the corresponding main body portion 410, the two sub-surfaces 432 corresponding to any two adjacent flanges are connected, and each sub-surface 432 is connected with the adjacent main surface 431.
In order to clearly describe the structures of the first body portion 411 and the second body portion 412, auxiliary lines are made in fig. 14, namely, a first boundary 401a, a second boundary 401b and a third boundary 401c, wherein two first boundaries 401a divide the first body portion 411 into a first body face 4111, a first flange 4112 and a second flange 4113, two first boundaries 401a divide the second body portion 412 into a second body face 4121, a third flange 4122 and a fourth flange 4123, the second boundary 401b is a boundary between the main face 431 of the second insulating portion 43 and the first body face 4111/the second body face 4121, and four third boundaries 401c are boundaries between the first flange 4112, the second flange 4113, the third flange 4122, the fourth flange 4123 and the corresponding four boundary faces 432, respectively.
In the above technical solution, the insulating member 4 can be conveniently coated on the outer side of the cell assembly 2 by arranging the main surface 431 and the sub-surface 432, so that the manufacturing and assembling efficiency can be ensured, and the manufacturing and assembling costs can be saved.
In some embodiments, two facets 432 corresponding to any two adjacent cuffs are disposed partially overlapping; and/or each facet 432 is arranged partially overlapping an adjacent main face 431.
Specifically, when the insulating member 4 and the holder 3 collectively encapsulate the active material coating portion 21, one of the adjacent two facets 432 may cover a portion of the other, at least a portion of the main surface 431 may cover an outer side of the two facets 432, or at least a portion of the two facets 432 may cover an outer side of the main surface 431.
Whether the two sub-surfaces 432 are overlapped or the sub-surfaces 432 and the adjacent main surfaces 431 are overlapped, the whole insulating member 4 can be fully ensured to be firmly matched with the bracket 3, the whole insulating member 4 and the bracket 3 can be matched and wrapped in the circumferential direction of the active material coating part 21, the exposure of the active material coating part 21 is fully reduced, the risk of corrosion of the shell 11 is reduced, and the stability and reliability of the battery cell 10 are improved.
Referring again to fig. 13 and 14, in some embodiments, when the insulating sub 430 is in the expanded state, the edges of the sub 432 adjacent the main face 431 are beveled; and/or the edge of the main face 431 adjacent to the facet 432 is beveled. In other embodiments, the facets 432 are square, triangular or trapezoidal, and the main faces 431 are correspondingly square, triangular or trapezoidal.
That is, when the insulating member 4 is in the covered state, the one end edge of the insulating portion 430 in the length direction is retracted with respect to the edge of the holder 3, preventing the insulating portion 430 from exceeding the edge of the holder 3, and the probability of scraping the housing 11 to the edge of the insulating member 4 can be reduced.
The width of the main surface 431 may be equal to or different from the width of the sub-surface 432, for example, as shown in fig. 14, in this embodiment, the difference between the width of the sub-surface 432 and the width of the main surface 431 is H, where H is greater than zero.
In some embodiments, the connection location of the main body insulating portion 41 and the first insulating portion 42 has a score 44; and/or the connection position of the main body insulating portion 41 and the second insulating portion 43 has a score 44. The score 44 is a boundary structure between the main insulating portion 41 and the first insulating portion 42/the second insulating portion 43, and may be formed by pressing with an indenter or other equipment after the insulating member 4 is manufactured, so that the thickness of the insulating member 4 at the score 44 is reduced, or may be preformed during the process of manufacturing the insulating member 4.
In the above technical solution, on one hand, by providing the score 44, the insulator 4 can be folded conveniently to smoothly wrap the active material coating portion 21, which is beneficial to improving the production and manufacturing efficiency and saving the production and manufacturing costs; on the other hand, such an arrangement can reduce errors in the process of coating the insulating member 4 to the active material coating portion 21, and can improve the accuracy and reliability of coating the insulating member 4 and the holder 3, to further improve the stability and reliability of the battery cell 10.
Referring to fig. 8 to 11 again, in order to facilitate connection of the conductive portion 22 to the pole 12 from the side of the active material coating portion 21 near the support 3, in the embodiment of the present application, the support 3 is provided with a via hole 311, and the conductive portion 22 passes through the via hole 311 and is connected to the pole 12, and may be connected to the pole 12 on the housing 11. The shape of the via 311 may be selected according to the shape of the conductive portion 22.
In the above technical solution, on one hand, by arranging the via hole 311 on the bracket 3, the bracket 3 can play a role of folding and accommodating the conductive part 22, so as to facilitate the connection between the conductive part 22 and the pole 12, and improve the assembly reliability and convenience of the battery cell 10; on the other hand, the support 3 closes the conductive part 22, so that the structure of plastic parts in the original battery cell 10 can be omitted, the insulation between the whole battery cell assembly 2 and the shell 11 can be realized through the cooperation of the support 3 and the insulating part 4, and the manufacturing and production cost can be effectively reduced.
In some embodiments of the present application, the support 3 may be of a unitary structure or of a split structure. Referring to fig. 18, fig. 18 is a schematic structural diagram of a bracket 3 of a battery cell 10 according to some embodiments of the present application, and when the bracket 3 is in an integrated structure, a via 311 is formed in a through hole form 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 casing 11, utmost point post 12 assembly, improvement 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. 19, fig. 19 is a schematic structural view of a bracket 3 of a battery cell 10 according to another embodiment of the application. When the bracket 3 is of a split structure, the bracket 3 may include a first bracket 33 and a second bracket 34 that are formed separately, and a via hole 311 is defined between the first bracket 33 and the second bracket 34.
In the embodiment of the present application, the first bracket 33 and the second bracket 34 are both elongated plate-shaped structures, and may be detachably connected, for example, they may be inserted or snapped together, so as to facilitate assembly. Meanwhile, one side of the first bracket 33, which is close to the second bracket 34, is provided with a half-hole structure, the other half-hole structure with shape adaptation is correspondingly arranged on the second bracket 34, which is close to the first bracket 33, and the half-hole structure of the first bracket 33 and the half-hole structure of the second bracket 34 jointly enclose an annular via hole 311. That is, the first bracket 33 and the second bracket 34 define a via hole 311 therebetween.
In the above technical solution, the via hole 311 is defined by the cooperation of the first bracket 33 and the second bracket 34, when the bracket 3 is assembled with the cell assembly 2, the conductive part 22 does not need to be penetrated from one end to the other end of the via hole 311, 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 via hole 311 surrounds the conductive part 22, thereby facilitating the assembly of the bracket 3 and the cell assembly 2 and improving the assembly efficiency.
Alternatively, when the cross section of the via hole 311 is elongated, the first and second brackets 33 and 34 are disposed on both sides in the width direction of the via hole 311, for example, the width direction of the via hole 311 is left and right, and the first and second brackets 33 and 34 are disposed on left and right sides of the via hole 311, so that the first and second brackets 33 and 34 are engaged with the conductive part 22.
Referring to fig. 20, fig. 20 is a schematic partial cross-sectional view of a battery cell according to some embodiments of the application. The side of the support 3 facing away from the active material coating portion 21 is provided with a receiving groove 393, the receiving groove 393 is communicated with the via hole 311, and the receiving groove 393 receives at least part of the pole 12. The shape of the accommodating groove 393 may be matched with the shape of the pole 12.
In the above technical solution, on one hand, the accommodating groove 393 accommodates at least part of the polar columns 12, so that the structure of the whole battery cell 10 is more compact and reliable, which is beneficial to realizing the improvement of the energy density of the whole battery; on the other hand, through the arrangement of the accommodating groove 393, insulation between the pole 12 and part of the positions of the shell 11 can be realized through the bracket 3, so that the stability and reliability of the battery cell 10 are further improved; in addition, the accommodating groove 393 accommodates the pole 12, so that the stability and reliability of the pole 12 can be improved, and the stability and reliability of the battery cell 10 in the charging and discharging process can be ensured.
Referring to fig. 21, fig. 21 is a structural cross-sectional view of a bracket of a battery cell according to some embodiments of the present application. The side of the holder 3 facing away from the active material application portion 21 is provided with a guide portion 32, the guide portion 32 is circumferentially provided around the via hole 311, and the guide portion 32 extends in a direction approaching the pole 12.
In some embodiments, the guide 32 may be an annular boss extending along the circumference of the via 311. In other embodiments, the guide 32 may include two oppositely disposed boss structures located on opposite sides of the via 311. For example, the via hole 311 may form an elongated hole, and two boss structures may be disposed opposite to each other in a width direction of the elongated hole, each boss structure extending along a length direction of the elongated hole.
The conductive part 22 passes through the through hole 311, and the conductive part 22 can be restrained, folded and supported by the guide part 32, so that the conductive part 22 and the pole 12 can be conveniently connected, and the assembly efficiency and the assembly quality of the battery cell 10 can be improved.
Referring again to fig. 21, according to some embodiments of the present application, a guide groove 312 is formed on a side of the support 3 facing the active material application portion 21, the guide groove 312 communicates with the via hole 311, the guide groove 312 accommodates at least part of the conductive portion 22, and a cross-sectional area of the guide groove 312 gradually increases along a direction in which the support 3 points toward the active material application portion 21.
Specifically, the groove wall of the guide groove 312 may be a slope or a cambered surface extending from inside to outside in a direction approaching the active material application portion 21, where "inside" means a position approaching the center of the guide groove 312, and conversely "outside" means a position away from the center of the guide groove 312, i.e., a position approaching the edge of the guide groove 312.
The guide groove 312 can accommodate the conductive part 22, avoid crush injury to the conductive part 22, reduce the probability of fluffing and turning the conductive part 22, and reduce redundancy.
Referring to fig. 22 and 23, fig. 22 is a top view of a bracket for a battery cell according to some embodiments of the application. Fig. 23 is a top view of a bracket for a battery cell according to other embodiments of the present application. The support 3 has at least one first injection flow guide groove 392 thereon, and the first injection flow guide groove 392 is located on the side of the support 3 facing the active material coating portion 21.
When the electrolyte is injected, the electrolyte can flow along the first electrolyte injection guide groove 392, the first electrolyte injection guide groove 392 can increase the fluidity of the electrolyte, improve the electrolyte injection speed and reduce the formation standing time. In addition, the provision of the first liquid injection guide groove 392 increases the contact area between the electrolyte and the active material coating portion 21, and can reduce the problem of poor wetting of the active material coating portion 21.
Wherein, at least one first injection guiding groove 392 is communicated with the guiding groove 312, and the electrolyte in the entering shell 11 can flow along the first injection guiding groove 392 towards the guiding groove 312, so that the electrolyte can flow to a preset position, and the contact area between the electrolyte and the active material coating part 21 is further increased.
Referring to fig. 22 again, in the embodiment in which the bracket 3 is of an integral structure and two poles 12 are disposed on the housing 11, two ends of the first injection guiding groove 392 may respectively correspond to the two poles 12, and two ends of the first injection guiding groove 392 are respectively communicated with the two guiding grooves 312, so that the electrolyte may flow along the first injection guiding groove 392 toward the two guiding grooves 312.
Referring to fig. 23 again, in an embodiment in which the support 3 is of a split structure and two poles 12 are disposed on the housing 11, the support 3 may include a first support 33 and a second support 34 that are formed separately, a through hole 311 is defined between the first support 33 and the second support 34, at least one first injection guiding groove 392 is disposed on the first support 33 and the second support 34, two ends of each first injection guiding groove 392 may correspond to two poles 12 respectively, and two ends of each first injection guiding groove 392 are communicated with two guiding grooves 312 respectively, and electrolyte may flow along the first injection guiding groove 392 toward the two guiding grooves 312.
According to some embodiments of the present application, a second injection guiding groove (not shown) may be further disposed on the support 3 according to requirements, where the second injection guiding groove is located on a side of the support 3 facing away from the cell assembly 2. Through such setting for when annotating the liquid, the electrolyte can be along first notes liquid guiding gutter 392 and/or second notes liquid guiding gutter flow, can increase the mobility of electrolyte, improves notes liquid speed, reduces the formation time of standing.
In the embodiment of the present application, the depth of the first liquid injection guiding groove 392 and/or the second liquid injection guiding groove is greater than or equal to 0.1mm, for example, the depth of the first liquid injection guiding groove 392 and the second liquid injection guiding groove may be 0.1mm, 0.2mm, 0.5mm, or the like, which may be specifically selected according to actual needs.
Referring to fig. 24 and 25, fig. 24 is a front view of a battery cell according to some embodiments of the present application. Fig. 25 is a front view of a battery cell according to other embodiments of the present application. One side of the bracket 3 is provided with a limit convex part 38, and the limit convex part 38 is clamped with the battery cell assembly 2.
Illustratively, in an embodiment of the present application, the limiting protrusion 38 may be disposed around the periphery of the cell assembly 2, so that the limiting protrusion 38 is connected to the cell assembly 2 in a clamping manner. For another example, the limit protrusion 38 may abut against an end of the cell assembly 2. For ease of understanding, it may be defined that the cell assembly 2 has a first end 201 and a second end 202 disposed opposite each other, the limit projection 38 being stopped on the outside of the side wall of the cell assembly 2 adjacent to the first end 201 thereof, the first end 201 of the cell assembly 2 with the holder 3 being advanced into the housing 11 during the process of loading the cell assembly 2 with the holder 3 into the housing 11, the first end 201 of the cell assembly 2 being gradually moved away from the opening 1110 in the housing 11 as the assembly process proceeds, the limit projection 38 being located between the side wall of the cell assembly 2 and the housing 11 during the assembly process, the holder 3 being located between the wall of the housing 11 opposite to the opening 1110 thereof and the first end 201 of the cell assembly 2 after the cell assembly 2 and the holder 3 are mounted in place in the housing 11.
So set up, spacing convex part 38 can retrain the one end of electric core subassembly 2, reduces the outer fluffy probability that takes place of electric core subassembly 2, still forms the protection to the one end of electric core subassembly 2, reduces the problem that the one end of electric core subassembly 2 touched casing 11, reduces the phenomenon emergence of going into shell process casing 11 scratch electric core subassembly 2 from this.
Referring again to fig. 24, the limit protrusion 38 forms an annular protrusion extending along the circumferential direction of the cell assembly 2. That is, the limit protruding portion 38 may be an integral structure, and the limit protruding portion 38 is sleeved on the outer side of the battery cell assembly 2, so that the limit protruding portion 38 can restrict the battery cell assembly 2 in the circumferential direction of the battery cell assembly 2, so that the fluffy probability of the outer layer of the battery cell assembly 2 is effectively reduced, one end of the battery cell assembly 2 is protected, the problem that one end of the battery cell assembly 2 touches the shell 11 is reduced, and the phenomenon that the shell 11 scratches the battery cell assembly 2 is reduced.
Referring to fig. 25 again, in some embodiments, the limiting protruding portions 38 may include a plurality of limiting protruding portions 38 arranged at intervals in the circumferential direction of the cell assembly 2, and a gap is formed between two adjacent limiting protruding portions 38, so that the limiting protruding portions 38 can reduce materials, reduce cost, and facilitate assembly of the bracket 3 and the cell assembly 2 on the basis of restraining and protecting the cell assembly 2.
Of course, the arrangement of the plurality of limit protrusions 38 is not limited to the above, and may be selected as needed.
Wherein, the limit convex part 38 is attached to the side wall of the battery cell assembly 2; alternatively, a gap is provided between the limit projection 38 and the side wall of the cell assembly 2. That is, the limiting protruding portion 38 may contact with the side wall of the battery cell assembly 2, or may not contact with the side wall of the battery cell assembly 2, and the limiting protruding portion 38 stops the side wall of the battery cell assembly 2, so as to reduce the probability of fluffing the outer layer of the battery cell assembly 2, and also protect the side wall of the battery cell assembly 2, so as to reduce the problem that one end of the battery cell assembly 2 touches the housing 11.
Referring to fig. 26, fig. 26 is a partial structural cross-sectional view of a battery cell 10 according to some embodiments of the present application. The surface of the side of the limit protrusion 38 facing the active material coating portion 21 may include a first surface 381, where the first surface 381 is attached to the side wall of the active material coating portion 21, and the first surface 381 may constrain the cell assembly 2 to reduce the probability of fluffing the outer layer of the active material coating portion 21, and also protect the side wall of the active material coating portion 21, so as to reduce the problem that one end of the active material coating portion 21 touches the housing 11.
Referring to fig. 27, fig. 27 is a partial structure sectional view of a battery cell 10 according to other embodiments of the present application. The side surface of the limit protrusion 38 facing the active material application portion 21 may include a second surface 382, and the distance between the second surface 382 and the active material application portion 21 gradually increases in the direction in which the holder 3 is directed toward the opening 1110, that is, the second surface 382 extends obliquely in the direction away from the root of the limit protrusion 38 and the side wall of the active material application portion 21, for example, the second surface 382 may be a slope or an arc surface.
In this way, the second surface 382 can stop the side wall of the active material coating portion 21, so as to reduce the possibility of fluffing the outer layer of the active material coating portion 21, and also protect the side wall of the active material coating portion 21, and in addition, the second surface 382 can play a guiding role, so that the assembly is convenient, and the assembly efficiency of the cell assembly 2 and the bracket 3 can be improved.
Referring to fig. 28, fig. 28 is a partial structural cross-sectional view of a battery cell 10 according to still other embodiments of the present application. The side surface of the limit protrusion 38 facing the active material coating portion 21 may include a first surface 381 and a second surface 382, the first surface 381 being attached to the side wall of the active material coating portion 21, the distance between the second surface 382 and the active material coating portion 21 gradually increasing in the direction of the holder 3 toward the opening 1110, the first surface 381 being located between the root of the limit protrusion 38 and the second surface 382.
Specifically, the contour line of the first surface 381 may be a straight line extending vertically along the height direction of the support 3, and the contour line of the second surface 382 may be an oblique line inclined along the height direction of the support 3, so that the active material coating portion 21 is well restrained, the probability of fluffiness of the outer layer of the active material coating portion 21 is effectively reduced, assembly is facilitated, and the assembly efficiency of the cell assembly 2 and the support 3 is improved.
Referring to fig. 29, fig. 29 is a partial structural cross-sectional view of a battery cell according to still other embodiments of the present application. The side of support 3 towards electric core subassembly 2 has clearance portion 391, and clearance portion 391 can dodge electric core subassembly 2 and face the edge of one side of support 3, reduces the risk that support 3 pressed electric core subassembly 2.
Specifically, in the embodiment in which the bracket 3 has the limit protrusion 38, when the bracket 3 is formed, a rounded corner structure may appear at the root of the side of the limit protrusion 38 near the center of the bracket 3, and by providing the clearance portion 391, the rounded corner structure may be removed, so as to prevent the rounded corner structure from damaging the outer edge of the cell assembly 2. The clearance portion 391 may be a groove that opens toward the cell assembly 2, for example, the groove may be an annular groove, and for another example, the groove may include a plurality of grooves and a plurality of grooves are arranged at intervals, and the shape of the groove may be selected according to practical situations. Of course, the avoidance portion 391 may be an avoidance slope or an avoidance arc surface that forms avoidance for the cell assembly 2. As long as the structure capable of forming avoidance for the cell assembly 2 belongs to the protection scope of the present application, no specific limitation is made herein. In other embodiments of the application, the side of the holder 3 facing the cell assembly 2 is in full contact with the cell assembly 2, i.e. the side of the holder 3 facing the cell assembly 2 has no clearance structure.
Referring to fig. 20 again, in the embodiment of the present application, the conductive portion 22 is connected to a side of the active material coating portion 21 near the support 3, the post 12 is provided with a receiving portion 121, and at least a portion of the guiding portion 32 extends into the receiving portion 121, so as to guide the conductive portion 22 to be received in the receiving portion 121, so as to facilitate the electrical connection and cooperation between the conductive portion 22 and the post 12. That is, the pole 12 is provided in a hollow structure.
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 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. Meanwhile, by arranging the pole 12 in a hollow structure and matching the guide part 32 with the hollow structure, the conductive part 22 can be guided to be connected with the pole 12, the connection reliability can be improved, and the assembly efficiency and quality can be ensured; on the other hand, the conductive part 22 can be accommodated in the accommodating part 121, so that the assembly efficiency of the conductive part 22 is improved, the occupied space of the conductive part 22 can be saved, and the space of the battery cell 10 is fully utilized, so that the matching between the bracket 3 and the pole 12 and between the bracket 3 and the conductive part 22 is tighter and more reliable, the structural heel of the battery cell 10 is compact, and the improvement of the energy density of the battery cell 10 is facilitated.
More specifically, part or all of the conductive part 22 is accommodated in the accommodating part 121, so that the portion of the conductive part 22 located in the accommodating part 121 may occupy the space in the pole 12, the occupied space of the conductive part 22 in the case 11 may be reduced, and when the size of the case 11 is fixed, some space may be saved in the case 11 to accommodate the larger-sized active material coating part 21, thereby 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 electrode post 12, the space occupation of the conductive part 22 between the active material coating part 21 and the electrode post 12 can be saved, 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 electrode post 12 can be reduced, and the energy density of the battery cell 10 can be improved.
Meanwhile, 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 larger number of battery cells 10, and the volumetric energy density of the battery 100 can also be improved; in addition, at least part of the conductive portion 22 is accommodated in the accommodating portion 121 to occupy the space in the pole 12, so that redundancy of the conductive portion 22 in the housing 11 can be reduced to at least a certain extent, the probability of short circuit between the conductive portion 22 and the active material coating portion 21 is reduced, the probability of short circuit of the battery cell 10 is reduced, and the operational reliability and stability of the battery cell 10 and the battery 100 are improved. Secondly, at least part of the conductive part 22 is accommodated in the accommodating part 121, and the conductive part 22 can be stably and restrained by the accommodating part 121, so that the welding operation between the conductive part 22 and the pole 12 can be orderly performed.
In the embodiment of the present application, the receiving portion 121 may be located on the side of the pole 12 facing the active material coating portion 21 or on the side of the pole 12 facing away from the active material coating portion 21.
Referring to fig. 30 and 31, fig. 30 is a schematic partial cross-sectional view of a battery cell according to some embodiments of the application. Fig. 31 is a schematic partial cross-sectional view of a battery cell according to some embodiments of the present application. When the receiving portion 121 is located on the side of the electrode post 12 facing the active material application portion 21, the receiving portion 121 includes a first receiving groove 12110, the surface of the electrode post 12 on the side facing the active material application portion 21 is an electrode post inner end surface 122, a notch of the first receiving groove 12110 is formed on the electrode post inner end surface 122, and at least part of the conductive portion 22 is received in the first receiving groove 12110.
Illustratively, the first receiving groove 12110 is a groove body having a groove-like structure with a certain depth. For example, when the pole 12 is provided at the upper end wall of the housing 11 and the pole inner end surface 122 is the lower surface of the 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 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 pole 12, the first accommodation groove 12110 is formed as an accommodation 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 accommodation groove 12110 is formed on the pole 12, so that the weight of the pole 12 can be reduced to a certain extent, and the weight energy density of the battery cell 10 and the battery 100 can be improved; on the other hand, since the notch of the first receiving groove 12110 is formed on the pole inner end surface 122, and the pole inner end surface 122 is the surface of the pole 12 on the side close to the active material coating portion 21, the first receiving groove 12110 can be opened toward the direction of 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, and can accommodate more conductive parts 22; 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 pole 12, foreign impurities outside are not easy to enter the first receiving groove 12110, the influence of the foreign 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.
Referring to fig. 30 again, in the embodiment of the present application, the connection manner of the 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 caulking, the housing 11 has a mounting hole 113 thereon, and the pole 12 is caulking-mounted at the mounting hole 113. Of course, it will be appreciated that the housing 11 may also be provided with mounting holes 113 when the two are mated by welding or other means, so that the pole 12 can be mounted to the housing 11 through the mounting holes 113, without limitation.
Meanwhile, 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 pole 12, the orthographic projection of the first receiving groove 12110 is located within the orthographic 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.
Specifically, when the housing 11 is provided with the mounting hole 113, and the pole 12 is mounted to the mounting hole 113, the depth H1 of the first accommodation groove 12110 is greater than or equal to the minimum distance H2 from the pole inner end surface 122 to the mounting hole 113 in the axial direction R of the pole 12.
The specific shape of the first receiving groove 12110 is not limited, and may be a regular shape, or an irregular shape, such as a rectangular, elliptical, or racetrack-shaped isosceles cylindrical groove, a rectangular trapezoid groove with a gradually-changed cross-sectional dimension, a hemispherical groove with a circular cross-sectional dimension, a semi-ellipsoidal groove with an elliptical cross-sectional dimension, or the like. 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 pole 12.
Since the depth H1 of the first receiving 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 pole 12, the volume of the pole 12 can be fully utilized, so that the first receiving groove 12110 has a greater depth, which is beneficial to receiving 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.
Referring to fig. 30 and 31 again, in order to ensure the stability and reliability of the electrical connection of the active material coating portion 21 and the pole 12, in some embodiments of the present application, the electrical connection position of the conductive portion 22 and the pole 12 may be located on the wall of the first receiving groove 12110 formed by the receiving portion 121.
Illustratively, the conductive portion 22 and the pole 12 may be electrically connected by welding, where the conductive portion 22 and the pole 12 are welded. Meanwhile, the welding method of the conductive portion 22 and the pole 12 is not limited, and may be, for example, laser welding, and vertical welding, oblique welding, or lap welding, edge sealing, or the like may be selected according to the position, angle, or structure of the welded portion. In other embodiments of the present application, the conductive portion 22 and the 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 pole 12 will be described below by taking a soldering position, i.e., an electrical connection position between the conductive portion 22 and the pole 12 as an example.
Specifically, the pole 12 specifically 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 to form a first receiving groove 12110, and an electrical connection position of the conductive portion 22 and the 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 pole 12 on at least one of the first end wall 12111 and the first side wall 12113, the first receiving groove 12110 has the function of receiving at least a portion of the conductive portion 22, and the groove wall of the first receiving groove 12110 also has the function of electrically connecting with the conductive portion 22, so that the structure of the pole 12 can be simplified, the processing of the pole 12 can be facilitated, and 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. And the groove wall of the first accommodating groove 12110 is used for realizing the electric connection with the conductive part 22, so that the electric connection area between the conductive part 22 and the 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 is further improved.
In addition, since the electrical connection position of the conductive part 22 and the pole 12 is located in the first accommodation groove 12110, it is not only possible to avoid protruding the electrical connection position outside the pole 12 and occupying the space outside the pole 12, but also possible to protect the electrical connection position from the pole 12, and improve the reliability and stability of the electrical connection of the conductive part 22 and the 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 so that the first receiving groove 12110 is isolated from the external space of the case 11, and the problem of leakage of the electrolyte in the case 11 from the first receiving groove 12110 can be avoided.
Referring again to fig. 30 and 31, in some alternative embodiments, the partial shape of the conductive portion 22 matches the partial shape of the first end wall 12111 and is configured and electrically connected so that the location at which 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 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 in a flat plate structure, the first end wall 12111 is disposed at an angle to the axial direction R of the pole 12, for example, may be a flat plate structure perpendicular to the axial direction R of the pole 12, or may be an inclined plate structure not perpendicular to the axial direction R of the 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.
Referring to fig. 32, fig. 32 is a schematic partial cross-sectional view of a battery cell according to some embodiments of the application. When the conductive portion 22 is electrically connected to the first end wall 12111, a first sink 12112 may be provided on the first end wall 12111, and the sinking direction of the first sink 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 sink 12112 on the first end wall 12111, the partial wall thickness of the first end wall 12111 can be partially thinned, which is advantageous not only for welding but also for lightening the weight of the pole 12 and improving the gravimetric energy density of the battery cell 10.
Referring to fig. 31 and 32 again, in the embodiment of the present application, the 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 pole 12 away from the active material coating portion 21, that is, the surface of the side of the 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 pole 12 is disposed on the upper end wall of the housing 11, the pole outer end face 123 is the upper surface of the pole 12, the first groove 126 is formed as a first groove in which the notch is opened upward, and the groove wall is recessed downward (i.e., toward the square recess near the cell assembly 2). For another example, when the pole 12 is disposed on the lower end wall of the housing 11 and the pole outer end face 123 is the lower surface of the pole 12, the first groove 126 is formed as a first groove in which the notch is opened downward and the groove wall is recessed upward (i.e., recessed toward a square shape away from the cell assembly 2).
In the above technical solution, on one hand, since the pole 12 is provided with the first groove 126, the weight of the 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 pole 12, i.e. is open towards the side of the pole 12 facing away from the interior of the housing 11, and the structural components of the battery 100 electrically connected to each battery cell 10 can be accommodated or mounted by using the first groove 126, so as to fully utilize the space in the pole 12 and improve the space utilization and the volumetric energy density of the battery 100.
In addition, since the first receiving groove 12110 and the first groove 126 are simultaneously formed in the pole 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 outside of the pole 12, i.e., a side of the pole 12 away from the active material applying portion 21, i.e., facilitating electrical connection of the conductive portion 22 and the pole 12 by external welding. That is, with the above-described structure, the external welding of the electrode post 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 conveniently and effectively weld the conductive portion 22 with the groove wall of the first receiving groove 12110 through the first groove 126, to improve the reliability of welding the conductive portion 22 with the groove wall of the first receiving groove 12110, in the embodiment of the present application, a portion between the first groove 126 and the first receiving groove 12110 may be laser welded with the conductive portion 22, that is, the spacer 127 shown in fig. 32 is laser welded with the conductive portion 22, so as to electrically connect the battery cell assembly 2 with the terminal post 12. The thickness of the spacer 127 of the 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 sidewall 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 rectangular shape, an oval shape, a racetrack shape, etc., and the welding of the conductive part 22 and the 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.
Referring to fig. 31 again, further, the battery cell 10 may further include a slot cover 7, where the slot cover 7 is disposed on the 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 the utmost point post 12 can realize through capping 7 with the indirect electric connection of converging the part, can be through setting up the position and the structure of capping 7, make capping 7 and the electric connection of converging the part more convenient and the electric connection area is bigger. 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 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.
As an example, referring to fig. 33, fig. 33 is a schematic partial cross-sectional view of a battery cell according to some embodiments of the present application, the accommodating portion 121 may also be configured to include a second accommodating groove 12120, a surface of the pole 12 on a side away from the active material coating portion 21 is a pole outer end surface 123, a notch of the second accommodating groove 12120 is formed on the pole outer end surface 123, the second accommodating groove 12120 is in communication with the interior of the housing 11 through a through hole 12130, and the conductive portion 22 is disposed through the through hole 12130 and at least partially accommodated in the second accommodating 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 pole 12 is provided at the upper end wall of the housing 11 and the pole outer end face 123 is the upper surface of the 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 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 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, please refer to fig. 33 again, on the one hand, the pole 12 is provided with the second accommodation groove 12120, which can reduce the weight of the 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 pole 12 on the side away from the active material coating portion 21, the second accommodation groove 12120 can be opened toward the direction away from the active material coating portion 21, so that when at least part of the conductive portion 22 is accommodated in the second accommodation groove 12120, the accommodation of the conductive portion 22 can be easily achieved through the notch of the second accommodation groove 12120, and the electrical connection operation and the like of the conductive portion 22 and the 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.
Meanwhile, since the second accommodation groove 12120 is communicated with the inside of the case 11 through the 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 accommodation groove 12120 can be communicated with the inside of the housing 11 through the through hole 12130, the second accommodation groove 12120 can also be used as an accommodation and buffer structure for gas generation 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 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 pole 12 is not limited.
Illustratively, when the conductive portion 22 is disposed through the through hole 12130 and at least partially received in the second receiving groove 12120, in the embodiment of the present application, the electrical connection position between the conductive portion 22 and the pole 12 is located on the hole wall of the through hole 12130 formed by the pole 12.
In the above technical solution, the electrical connection position between the conductive portion 22 and the pole 12 is disposed on the hole wall of the through hole 12130, so that the electrical connection operation between the conductive portion 22 and the pole 12 is facilitated through the second accommodating groove 12120, and when the electrical connection area between the conductive portion 22 and the pole 12 is large, the electrical connection between the conductive portion 22 and the pole 12 can be utilized to seal the through hole 12130, so as to save sealing cost, reduce electrolyte leakage, and save sealing parts.
Specifically, the welding of the conductive part 22 and the wall of the through hole 12130 may be performed at the position of the through hole 12130 connected to the second receiving groove 12120, which is convenient to operate, and the sealing of the through hole 12130 may be achieved by the welding and the conductive part 22 through the control of the welding so as to improve the leakage of the electrolyte in the case 11 from the through hole 12130.
As another example, when the conductive portion 22 is disposed through the 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 pole 12 may also be located on the groove wall of the second receiving groove 12120 formed by the 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 accommodation groove 12120 formed by the 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.
Referring to fig. 33 again, the 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 through hole 12130 is disposed on the second end wall 12121, and an electrical connection position between the conductive portion 22 and the pole 12 is located on the second end wall 12121 and/or the second side wall 12123.
More specifically, the conductive portion 22 and the pole 12 may be electrically connected by welding, and thus the welding position is the position where the conductive portion 22 and the pole 12 are electrically connected. In other embodiments of the present application, the conductive portion 22 and the pole 12 may be electrically connected instead of soldering, 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 pole 12 will be described below by taking a soldering position, i.e., an electrical connection position between the conductive portion 22 and the pole 12 as an example. For example, in some embodiments, the location of the electrical connection of the conductive portion 22 to the pole 12 is at the second end wall 12121 and/or the second side wall 12123, and may be a weld of the conductive portion 22 to at least one of the second end wall 12121 and the second side wall 12123.
In the above-described embodiments, by providing the electrical connection position of the conductive portion 22 and the 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 pole 12 can be simplified, and the processing of the pole 12 can be facilitated. Moreover, since the 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 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 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 part 22 and the pole 12 is located in the second accommodation groove 12120, it is not only possible to avoid protruding the electrical connection position outside the pole 12 and occupying the space outside the pole 12, but also possible to protect the electrical connection position from the pole 12, and improve the reliability and stability of the electrical connection of the conductive part 22 and the pole 12.
Referring again to fig. 33, in some embodiments, the partial shape of the conductive portion 22 matches the partial shape of the second end wall 12121, and the electrical connection is provided and implemented in a fitting manner such that the location where the conductive portion 22 is electrically connected to the second end wall 12121 extends along the length or width direction 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 in a flat plate structure, the second end wall 12121 is disposed at an angle to the axial direction R of the pole 12, for example, may be a flat plate structure perpendicular to the axial direction R of the pole 12, or may be an inclined flat plate structure not perpendicular to the axial direction R of the pole 12, but the inclination direction is not limited.
For example, referring again to fig. 33, when the second end wall 12121 has a flat plate-like structure, the angle θ between the second end wall 12121 and the axial direction R of the pole 12 is equal to 90 °, i.e., the second end wall 12121 is equidistant from the active material coating portion 21 along the direction from the 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.
For another example, the second end wall 12121 may have an angle θ of greater than 90 ° with respect to the axial direction R of the pole 12, i.e., the second end wall 12121 may extend obliquely toward the active material coated portion 21 in the direction from the through hole 12130 to the second side wall 12123. 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 pole 12, which may, on the one hand, facilitate easy machining of the second end wall 12121 and electrical connection with the conductive portion 22, and, on the other hand, more fully utilize the space within the pole 12 to accommodate the conductive portion 22.
For another example, the second end wall 12121 forms an angle θ of less than 90 ° with the axial direction R of the pole 12, i.e., the second end wall 12121 extends obliquely toward a direction away from the active material coating portion 21 in a direction from the through hole 12130 to the second side wall 12123. 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 pole 12, which may allow for ease of processing of the second end wall 12121 and electrical connection with the conductive portion 22 on the one hand, and may more fully utilize the space within the 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. 33 again, and further referring to fig. 34, fig. 34 is a schematic partial cross-sectional view of a battery cell according to some embodiments of the present application. Regardless of the specific value of the included angle θ between the second end wall 12121 and the axial direction R of the 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 provided on the second end wall 12121 according to the requirement, and 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.
Referring to fig. 34 again, in the embodiment of the present application, the connection manner of the 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 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 pole 12 being mounted at the mounting holes 113.
Optionally, referring to fig. 33 again, 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 pole 12, the front projection of the second receiving groove 12120 is located within the front projection range of the mounting hole 113, so that the second receiving groove 12120 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 again to fig. 33, when the housing 11 has the mounting hole 113, and the pole 12 is mounted in 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 along the axial direction R of the pole 12.
The specific shape of the second accommodation groove 12120 is not limited, and may be a regular shape, or an irregular shape, such as an isosceles cylindrical groove having a rectangular, elliptical, or racetrack shape in 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. It should be noted that the racetrack shape described herein refers to a shape in which two short sides of a rectangle are replaced by convex curves.
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 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 pole 12, the volume of the 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.
Referring to fig. 34, and further referring to fig. 35 and 36, fig. 35 is a schematic view of a portion of a battery cell 10 according to some embodiments of the present application, and fig. 36 is an exploded view of a structure of the battery cell 10 shown in fig. 35, in an embodiment of the present application, when the accommodating portion 121 has the second accommodating groove 12120 of any one of the embodiments, optionally, the battery cell 10 may further include a first cover plate 13, where the first cover plate 13 cooperates with the pole 12 and closes a notch of the second accommodating groove 12120, and the first cover plate 13 is electrically connected with the 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 pole 12, indirect electrical connection between the pole 12 and the bus member can be easily achieved by using the first cover plate 13, and the connection area of the electrical connection is advantageously increased, thereby being advantageous to reduce 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 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, the first cover plate 13 may be welded to the pole 12, and when machining, the conductive portion 22 may be first passed through the 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 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, fig. 37 is an exploded view of the structure of the first cover plate shown in fig. 36, and referring to fig. 35-37, the first cover plate 13 includes a first conductive member 131 and a second conductive member 132, which are made of different materials, the first conductive member 131 is mated with and electrically connected to the pole 12, and the second conductive member 132 is mated with and electrically connected to 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 pole 12, so that the first conductive member 131 and the pole 12 are convenient to be electrically connected, for example, the first conductive member 131 and the pole 12 can be reliably and stably connected easily by welding. And because the second conductive member 132 and the first conductive member 131 are made of different materials, the second conductive member 132 is convenient to be electrically connected with the bus member with a material different from that of the pole 12, for example, the second conductive member 132 can be easily and reliably and stably connected with the bus member with the same material as that of the second conductive member 132 by welding.
Illustratively, when the pole 12 is a negative pole, the pole 12 is a copper pole, and the bus member is an aluminum sheet, at this time, the first conductive member 131 may be set to be a copper material, and the second conductive member 132 may be set to be an aluminum material, so that the pole 12 and the first conductive member 131 may be effectively welded with the same material, and at the same time, the second conductive member 132 and the bus member may be effectively welded with the same material, so that indirect electrical connection between the pole 12 and the bus member through the first cover plate 13 may be effectively realized. Moreover, the electrode post 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. 35-37, in some alternative examples, the first conductive member 131 is located between the second receiving groove 12120 and the second conductive member 132. In the above-described 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 case 11 enters the second accommodation groove 12120 from the 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 to prevent the electrolyte from flowing from the second conductive member 132 to Xiang Xielou.
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. 35-37, the first conductive member 131 has a second groove 1311, 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 pole 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 form made of multiple materials, for example, in other embodiments of the present application, fig. 38 is a schematic partial cross-sectional view of a battery cell according to some embodiments of the present application, fig. 39 is an exploded view of the battery cell shown in fig. 38, and referring to fig. 38 and 39, the first cover 13 may be integrally formed into a non-composite form made of the same material, for example, for adapting to a positive electrode post, which is not described herein.
Referring to fig. 35-37 again, in some embodiments, the first cover 13 is further embedded in the notch of the second accommodating 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 pole 12 can be reduced, the assembly stability of the first cover plate 13 and the 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 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 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 pole 12, i.e. directly cover the notch of the second accommodating groove 12120, so as to be conveniently matched with the current collecting member of the battery 100, which is not limited in this embodiment.
Referring to fig. 35-37 again, optionally, in the embodiment of the application, at least part of the wall surface of the 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 for guiding 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 pole 12, and improve the problem of pool collapse or laser injection into the pole 12 during welding.
Specifically, referring to fig. 35-37, 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 adjacent 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 pole 12, and the groove depth of the first groove segment 12124 can be defined, so that a sufficient space is provided in the second accommodation groove 12120 to accommodate the conductive part 22.
Further, when the wall surface at the notch of the 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 face 123 so that the side wall of the second groove section 12125 is formed as the guide slope 12126, thereby facilitating the processing and simply and effectively satisfying the guide requirement.
Referring to fig. 35-37 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 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 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. 38 to 39, in the embodiment of the application, the battery cell 10 may further include a second cover plate 14 according to requirements, where the second cover plate 14 covers the through hole 12130 and is located outside the conductive portion 22 in the second accommodating groove 12120.
It should be noted that, when the battery cell 10 includes the second cover 14, the battery cell 10 may include the first cover 13 at the same time or may not include the first cover 13 at the same time. Further, when the battery cell 1 includes the second cover plate 14 and the first cover plate 13 at the same time, the first cover plate 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 through holes 12130, so that when the electrolyte enters the second accommodating groove 12120 from the through holes 12130, the problem that the electrolyte overflows from the 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. 38-39, 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 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.
Referring again to fig. 3-5, 15, 20 and 34, a battery cell 10 according to an embodiment of the application will be described.
In the embodiment of the present application, the battery cell 10 is in 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. The closed end of the can 111 along the first direction Z is provided with two poles 12, and the two poles 12 are spaced apart along the second direction X to be a positive pole and a negative pole, respectively.
The two pole pieces 12 are provided with the accommodating parts 121, the accommodating parts 121 comprise second accommodating grooves 12120, specifically, the pole pieces 12 comprise second end walls 12121 and second side walls 12123, the second end walls 12121 are located on one side, close to the shell cover 112, of the second side walls 12123, the second end walls 12121 and the second side walls 12123 are surrounded to form second accommodating grooves 12120, the surface, far away from the shell cover 112, of each pole piece 12 is a pole piece outer end face 123, notches of the second accommodating grooves 12120 are formed in the pole piece outer end faces 123, through holes 12130 are formed in the second end walls 12121, and the through holes 12130 are located in positions, close to the second side walls 12123, of the second end walls 12121.
The battery cell 10 further includes a battery cell assembly 2, a holder 3, and an insulating member 4, the battery cell assembly 2 includes an active material coating portion 21 and a conductive portion 22, the active material coating portion 21 is accommodated in the case 11, the holder 3 is provided at one end of the active material coating portion 21, and the holder 3 is located between the closed end of the case body 111 in the first direction Z and the active material coating portion 21, the holder 3 has two through holes 311, and the two through holes 311 are spaced apart in the second direction X.
The insulator 4 includes a main body insulating portion 41, a first insulating portion 42 and a second insulating portion 43, the first insulating portion 42 and the second insulating portion 43 being provided at both ends of the main body insulating portion 41, respectively, the main body insulating portion 41 being wrapped around the peripheral side of the active material coating portion 21, the first insulating portion 42 being wrapped around the end portion of the active material coating portion 21 away from the stent 3, the second insulating portion 43 being located on the side of the main body insulating portion 41 near the stent 3, and the second insulating portion 43 being fitted with a side wall surface of the stent 3 away from the active material coating portion 21, the second insulating portion 43 and the stent 3 jointly wrapping the end portion of the active material coating portion 21 near the stent 3. A portion of the conductive portion 22 extends from the via 311 on the bracket 3, the through hole 12130 on the post 12, into the second receiving groove 12120, and is soldered to the second end wall 12121 to electrically connect the active material coated portion 21 and the post 12 through the conductive portion 22.
According to the technical scheme, at least one part of the insulating piece 4 is connected with the wall surface, far away from the battery cell assembly 2, of the bracket 3, on one hand, in the process of loading the battery cell assembly 2 with the bracket 3 into the shell 11, the shell 11 cannot scratch the edge of the insulating piece 4 and cannot scratch the connecting position between the insulating piece 4 and the bracket 3, the connecting position of the insulating piece 4 and the bracket 3 cannot be pulled away easily in the shell loading process, the movement and sliding of the insulating piece 4 in the shell loading process of the battery cell assembly 2 can be reduced, the connection reliability between the insulating piece 4 and the bracket 3 can be improved, the falling risk of the insulating piece 4 is reduced, the corrosion risk of the shell 11 of the battery cell assembly 2 due to bare leakage can be reduced, the failure risk of the battery cell assembly 2 is reduced, the leakage risk is reduced, and the reliability and the stability of the battery cell 10 can be improved; meanwhile, compared with the connection of the insulating part 4 and the peripheral side of the battery cell assembly 2, the insulating part 4 is matched with the bracket 3, so that the insulating part 4 is originally adjacent to four surfaces of the peripheral side of the shell 11, the probability that the matching position of the insulating part 4 and the bracket 3 is interfered for being adjacent to one surface of one end of the shell 11 is greatly reduced, the reliability and the stability of the insulating part 4 can be further improved, and the reliability and the stability of the battery cell 10 can be improved; in addition, at least a part of the insulating piece 4 is connected with the wall surface of the bracket far away from the battery cell assembly 2, so that the insulating piece 4 can be designed to be longer in size, the battery cell assembly 2 with different sizes can be suitable, the compatibility is higher, and the manufacturability can be improved. On the other hand, after the bracket 3 and the cell assembly 2 are installed in place in the housing 11, the insulating member 4 is pressed between the wall surface of the housing 11 opposite to the opening 1110 and the bracket 3, so that the risk of falling off of the insulating member 4 can be further reduced, the risk of failure of the cell assembly 2 due to bare leakage is reduced, the risk of corrosion of the housing 11 is reduced, and the reliability and stability of the battery cell 10 are improved.
According to some embodiments of the present application, the present application also provides a battery 100, including the battery cell 10 according to any one of the above aspects.
In the above technical scheme, because the battery 100 is provided with the battery cell 10, and because at least one part of the insulating member 4 is connected with the wall surface of the bracket 3 far away from the battery cell assembly 2, the connection reliability between the insulating member 4 and the bracket 3 can be improved, the risk that the insulating member 4 falls off is reduced, the risk that the shell 11 is corroded due to bare leakage of the battery cell assembly 2 can be further reduced, the risk that the battery cell assembly 2 fails is reduced, the risk of leakage is reduced, and the reliability and stability of the battery 100 can be further improved.
According to some embodiments of the present application, the present application also provides an electric device 1000, including the battery 100 according to any one of the above aspects.
In the above technical solution, since the power consumption device 1000 is provided with the battery 100, the operational reliability and stability of the power consumption device 1000 can be improved due to the improvement of the operational reliability and stability of the battery 100. It can be appreciated that when the electric device 1000 is a vehicle, the battery 100 is improved in service life, which is beneficial to improving the endurance mileage of the vehicle.
The powered device 1000 may be any of the aforementioned devices or systems employing the battery 100.
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 (31)
1. A battery cell, comprising:
a housing;
a cell assembly;
the bracket is arranged at one end of the battery cell component;
the insulating piece is matched with the bracket and coats the battery cell assembly;
the battery cell assembly, the support and the insulating piece are arranged in the shell, and at least one part of the insulating piece is connected with the wall surface, far away from the battery cell assembly, of the support.
2. The battery cell of claim 1, wherein the insulator is connected to the support in an annular continuous or annular spaced connection with the circumference of the wall of the support away from the cell assembly.
3. The battery cell of claim 2, wherein the insulator is thermally fused to a wall of the bracket remote from the cell assembly to form a connection footprint;
the connection imprint extends annularly around the circumference of the wall surface; alternatively, the number of the connection marks is plural, and the plural connection marks are arranged at intervals around the circumference of the wall surface.
4. The battery cell of claim 1, wherein the housing is provided with a post; the battery cell assembly comprises an active material coating part and a conductive part, wherein the conductive part is connected with one side, close to the support, of the active material coating part, extends towards the pole and is connected with the pole, and the insulating part and the support are jointly coated on the circumference of the active material coating part.
5. The battery cell according to claim 4, wherein the insulating member includes a main body insulating portion, a first insulating portion, and a second insulating portion, the main body insulating portion being wrapped around a peripheral side of the active material coating portion;
the first insulating part and the second insulating part are respectively arranged at two ends of the main body insulating part, the first insulating part is positioned at one side of the main body insulating part away from the support and is wrapped at the end part of the active substance coating part away from the support, and the second insulating part is positioned at one side of the main body insulating part close to the support and is used for being matched with the support and jointly wrapping the end part of the active substance coating part close to the support.
6. The battery cell of claim 5, wherein the body insulating portion comprises a plurality of body portions; the main body parts are sequentially connected end to form a ring shape, the main body parts are jointly wrapped on the periphery of the active material coating part, and the first insulating part and the second insulating part are respectively positioned at two ends of the ring-shaped structure formed by the main body parts.
7. The battery cell of claim 6, wherein the connection locations of any adjacent two of the body portions have a partial overlap.
8. The battery cell according to claim 6, wherein a peripheral side of the active material coating portion has a plurality of faces;
each main body part comprises a main body surface and two flanges arranged on two sides of the main body surface, any two adjacent main body parts are connected through the flanges, and each main body surface and each two flange connecting structures wrap different surfaces of the periphery of the active substance coating part respectively.
9. The battery cell according to claim 8, wherein a peripheral side of the active material coating portion has four faces;
the main body insulation part comprises two main body parts arranged on two sides of the first insulation part, namely a first main body part and a second main body part, wherein the first main body part comprises a first main body surface, a first flanging and a second flanging which are arranged on two sides of the first main body surface, the second main body part comprises a second main body surface, a third flanging and a fourth flanging which are arranged on two sides of the second main body surface, the first flanging is connected with the third flanging, and the second flanging is connected with the fourth flanging;
The connecting structure of the first main body surface, the first flanging and the third flanging, the connecting structure of the second main body surface, the second flanging and the fourth flanging respectively wrap four surfaces which are sequentially arranged on the periphery of the active material coating part.
10. The battery cell of claim 9, wherein the first insulating portion has a centerline, the first body portion and the second body portion being located on either side of the centerline of the first insulating portion, respectively;
the first main body part and the second main body part are symmetrically arranged by taking the central line as a symmetry axis, or the first main body surface and the second main body surface are symmetrically arranged.
11. The battery cell as recited in claim 8, wherein the second insulating portion comprises a plurality of insulating sections, the plurality of insulating sections being connected in one-to-one correspondence with the plurality of body portions;
any two adjacent insulating subdivisions have a partial overlap.
12. The battery cell of claim 11, wherein each of the insulating sections includes a main face and two sub-faces, the main face being connected to the main face of the corresponding main body portion, the two sub-faces being connected to the respective two flanges of the main body portion;
Two corresponding sub-surfaces of any two adjacent turned-ups are connected and arranged, and each sub-surface is connected and arranged with the adjacent main surface.
13. The battery cell according to claim 12, wherein two of the partial surfaces corresponding to any adjacent two of the flanges are partially overlapped; and/or each facet is arranged to partially overlap an adjacent said major face.
14. The battery cell according to claim 5, wherein a connection position of the main body insulating portion and the first insulating portion has a score; and/or the connection position of the main body insulating part and the second insulating part is provided with a notch.
15. The battery cell of any one of claims 1-14, wherein a post is provided on the housing; the battery cell assembly comprises an active material coating part and a conductive part, wherein the conductive part is connected with one side, close to the bracket, of the active material coating part, the bracket is provided with a through hole, and the conductive part passes through the through hole to be connected with the pole.
16. The battery cell of claim 15, wherein the bracket is of unitary construction; or, the support is of a split type structure and comprises a first support and a second support which are formed independently, and the through holes are defined between the first support and the second support.
17. The battery cell as recited in claim 15, wherein a side of the bracket facing away from the active material coating portion defines a receiving recess in communication with the via, the receiving recess receiving at least a portion of the post.
18. The battery cell according to claim 15, wherein a guide portion is provided on a side of the holder facing away from the active material application portion, the guide portion being circumferentially provided around the via hole and extending in a direction approaching the post.
19. The battery cell as recited in claim 18, wherein the post is provided with a receiving portion, at least a portion of the conductive portion being received in the receiving portion, and at least a portion of the guide portion extending into the receiving portion for guiding the conductive portion to be received in the receiving portion.
20. The battery cell according to claim 15, wherein a side of the holder facing the active material application portion is formed with a guide groove communicating with the via hole, the guide groove accommodating at least part of the conductive portion, the guide groove having a cross-sectional area gradually increasing in a direction in which the holder approaches the active material application portion.
21. The battery cell of claim 20, wherein the bracket has at least one first injection flow guide groove thereon, the first injection flow guide groove being located on a side of the bracket facing the active material coating portion; at least one first liquid injection guide groove is communicated with the guide groove.
22. The battery cell of any one of claims 1-14, wherein the bracket has a first fluid injection channel thereon, the first fluid injection channel being located on a side of the bracket proximate to the cell assembly; and/or the bracket is provided with a second liquid injection diversion trench, and the second liquid injection diversion trench is positioned at one side of the bracket, which is away from the battery cell component.
23. The battery cell of any one of claims 1-14, wherein a side of the support facing the cell assembly has a void for avoiding an outer edge of a side of the cell assembly facing the support.
24. The battery cell of any one of claims 1-14, wherein one side of the bracket is provided with a limit protrusion that is engaged with the cell assembly.
25. The battery cell of any one of claims 1-14, wherein a post is provided on the housing; the battery cell assembly comprises an active substance coating part and a conductive part, wherein the conductive part is connected with one side, close to the bracket, of the active substance coating part;
The pole is provided with an accommodating part, and at least part of the conductive part is accommodated in the accommodating part and connected with the pole.
26. The battery cell according to claim 25, wherein the receiving portion has a first receiving groove, a surface of the electrode column on a side facing the active material application portion is an electrode column inner end surface, a notch of the first receiving groove is formed on the electrode column inner end surface, and at least a part of the conductive portion is received in the first receiving groove.
27. The battery cell according to claim 25, wherein the housing portion has a second housing groove, a surface of the electrode on a side away from the active material application 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 through hole, and the conductive portion is provided through the through hole and at least partially housed in the second housing groove.
28. The battery cell of any one of claims 1-14, wherein the housing comprises a housing body and a housing cover, the housing body having an opening;
the number of the openings is one, the shell cover is covered on the openings, and the bracket is positioned at one end of the battery cell component far away from the openings; or the number of the openings is two, each opening is covered with one shell cover, and the bracket is positioned at one end of the battery cell component, which is far away from any one opening.
29. The battery cell of any one of claims 1-14, wherein at least one post is provided on a wall of the housing adjacent a side of the bracket.
30. A battery comprising a cell according to any one of claims 1-29.
31. An electrical device comprising a battery according to claim 30.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320386766.2U CN219917486U (en) | 2023-03-03 | 2023-03-03 | Battery cell, battery and electricity utilization device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320386766.2U CN219917486U (en) | 2023-03-03 | 2023-03-03 | Battery cell, battery and electricity utilization device |
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| Publication Number | Publication Date |
|---|---|
| CN219917486U true CN219917486U (en) | 2023-10-27 |
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| CN202320386766.2U Active CN219917486U (en) | 2023-03-03 | 2023-03-03 | Battery cell, battery and electricity utilization device |
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| Country | Link |
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| CN (1) | CN219917486U (en) |
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- 2023-03-03 CN CN202320386766.2U patent/CN219917486U/en active Active
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