CN218300152U

CN218300152U - Current collector, end cover assembly, battery and battery pack

Info

Publication number: CN218300152U
Application number: CN202221913795.1U
Authority: CN
Inventors: 徐卫东; 何波; 张男
Original assignee: Xiamen Hithium Energy Storage Technology Co Ltd
Current assignee: Xiamen Hithium Energy Storage Technology Co Ltd
Priority date: 2022-07-21
Filing date: 2022-07-21
Publication date: 2023-01-13
Anticipated expiration: 2032-07-21
Also published as: WO2024017367A1

Abstract

The application discloses mass flow body, end cover subassembly battery and battery package. The current collector comprises a body and a folding assembly. At least part of the folding assembly can be bent relative to the body, the folding assembly comprises at least two stacked folding pieces, and at least one concave part is arranged on each folding piece. The current collector, the end cover assembly and the battery in the embodiment of the application can avoid the problem that the current collector is broken when vibrating in-process, particularly vibrating fatigue, through arranging at least two stacked folding pieces, thereby prolonging the service life of the current collector.

Description

Current collector, end cover assembly, battery and battery pack

Technical Field

The application relates to the technical field of batteries, in particular to a current collector, an end cover assembly, a battery and a battery pack.

Background

With the development of society, the environmental pollution is aggravated and the traditional energy is exhausted day by day, so people have stronger and stronger awareness on environmental protection. Lithium ion batteries are the first choice of green energy due to their advantages of high energy density, high voltage, low discharge rate, long cycle life, etc., and thus are widely used in portable devices such as bluetooth headsets, mobile phones, digital computers, tablet computers, etc., and large-scale devices such as electric vehicles, energy storage power stations, etc.

Under comparing, when the apron subassembly of cylinder battery assembled, need fold the mass flow body. However, the folded portion is easily subject to a problem of breakage during vibration, particularly when the current collector is subjected to vibration fatigue.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a current collector, an end cover assembly, a battery and a battery pack.

The current collector in the embodiment of the application comprises a body and a folding assembly. At least part of the folding assembly can be bent relative to the body, and the folding assembly comprises at least two stacked folding pieces, and at least one concave part is arranged on each folding piece.

In the mass flow body of this application, folding assembly includes two at least folding pieces that laminate together, so be favorable to increasing folding assembly's rigidity, reduce folding assembly cracked possibility to solve the easy cracked problem of mass flow body when vibration is tired, with the life of extension mass flow body.

In some embodiments, the folding assembly includes a bending part and a connecting part, the bending part is connected to the body through the connecting part, and the bending part can be bent relative to the connecting part.

The bending part is connected with the body through the connecting part so as to realize the fastening connection of the multilayer folding component and the body and ensure the connection reliability of the multilayer folding component and the body.

In some embodiments, at least a portion of the connecting portion is fixedly connected to a side of the body.

At least part of the connecting part is fixedly connected to one side of the body so as to realize the fastening connection of the multi-layer folding assembly and the body and ensure the connection reliability of the multi-layer folding piece and the body.

In some embodiments, an orthographic projection area of the bent portion on the body after bending is larger than an orthographic projection area of the connecting portion on the body.

The orthographic projection area of the bent part on the body after bending is larger, and the overcurrent capacity of the current collector is ensured. In addition, the area of the orthographic projection of the connecting part on the body is relatively small, so that the area occupied by the body is small when the connecting part is welded with the body, and then the body can be guaranteed to be reserved with a sufficient space for welding the lug, and the overcurrent capacity of the current collector is guaranteed.

In some embodiments, an orthographic projection of the bent part on the body after bending covers at least part of the connecting part.

The main part of the bending part after bending is positioned right above the body, which is beneficial to preventing the current collector from generating eccentricity in the process of entering the shell.

In certain embodiments, the thickness of the connecting portion is greater than the thickness of the body.

The thickness of connecting portion is greater than the thickness of body, so the content can be individual the structural strength who guarantees connecting portion and body coupling.

In some embodiments, the recess includes a first recess, and a connection portion of the connecting portion and the bent portion has at least one first recess located at an end side of the connection portion.

The bending part can be bent relative to the connecting part along the first concave part, so that the folding piece is folded, and the folding of the current collector is also facilitated. In addition, can also guarantee that the mass flow body is folding according to the assigned direction to when subsequent assembly battery, be favorable to preventing the mass flow body and appearing eccentric problem at the in-process of going into the shell. In addition, the first concave portion may also be used as a stopper portion. The current collector may be matched with a limiting member of another component (e.g., a lower plastic) through the first recess to limit the position of the current collector.

In some embodiments, the number of the first concave portions is two, and the two first concave portions are respectively located at both ends of the connection portion.

When the first concave part is used as a current collector in a bending mode, the bending part can be bent relative to the connecting part along the two first concave parts at the two ends of the connecting part, and bending of the folding piece is facilitated. This arrangement provides better stability of the current collector folding. When first concave part uses as spacing portion, be located two first concave parts at junction both ends and can play the stable positioning action of preferred to the current collector whole.

In some embodiments, the connection comprises at least part of at least two stacked said folds, the first recess comprises at least one first sub-recess, at least one of the folds having the first sub-recess, the first sub-recess being located at an end side of the fold.

When the use is buckled as the mass flow body in first concave part, it is better to set up like this and make the mass flow body folding stability of buckling to make the mass flow body of buckling also difficult to rise the fold, do benefit to the mass flow body water conservancy diversion. When the first concave portion is used as a stopper portion, the first concave portion provided in this way is easily engaged with another member for stopper.

In some embodiments, the at least two folding members include a first folding member and a second folding member, the first folding member and the second folding member are stacked, the first folding member has the first sub-concave portion, the second folding member has the first sub-concave portion, and the first sub-concave portion of the first folding member and the first sub-concave portion of the second folding member are stacked.

When the first concave part is used as a current collector in a bending mode, the current collector is enabled to be folded to have better stability by the arrangement, and the current collector can be guaranteed to have better flow guiding effect. In addition, when the first concave portion is used as the stopper portion, the first sub-concave portion provided in a stacked manner can provide a favorable stability when the first concave portion is engaged with a stopper of another member (e.g., lower plastic) for stopper.

In some embodiments, the number of the folding pieces is plural, each of the folding pieces has the first sub-concave portion, and the plural first sub-concave portions located on the same side of the connection are stacked.

When first concave part is used as the mass flow body and is buckled, it is better to set up like this and make the folding stability of mass flow body to can guarantee that the mass flow body has better water conservancy diversion effect. When the first concave part is used as the limiting part, the first concave part and other parts are easy to limit and match, and the structural stability of matching of the first concave part and other parts is good.

In certain embodiments, the first sub-recess is an arcuate slot.

When first concave part is used as the mass flow body and is buckled, set up like this and make the folding stability of mass flow body better to can prevent to produce interference effect to self or other parts when the mass flow body is folding. When the first concave part is used as the limiting part, the first concave part and other parts are easy to limit and match, and the structural stability of matching of the first concave part and other parts is good.

In some embodiments, the connection portion includes a first fold portion connected to the first concave portion, and the bending portion is capable of bending along the first fold portion relative to the connection portion.

When first concave part is being used as the mass flow body and is buckling, it is better to set up the stability that makes the mass flow body folding like this to be difficult to the dislocation when making the mass flow body buckle.

In some embodiments, the number of the first concave portions is two, two first concave portions are respectively located at two ends of the connection portion, the first fold portion connects the two first concave portions, and the first fold portion is located between the two first concave portions.

When the first concave part is bent as the current collector, the folded stability of the current collector is better by the arrangement, the current collector is not easy to misplace when bent, and the accuracy of the bent current collector is higher.

In some embodiments, the first fold comprises at least part of at least two of the folded pieces stacked, the first fold comprises two or more first sub-folds, at least one of the folded pieces has the first sub-folds, and the two or more first sub-folds are stacked.

In some embodiments, the recess includes a second recess, and the bent portion has at least one second recess located at an end side of the bent portion.

The kink can be followed the second concave part and buckled, is favorable to the folded piece to be folded, also is favorable to the mass flow body to fold. In addition, can also guarantee that the mass flow body is folding according to the assigned direction to when subsequent assembly battery, be favorable to preventing the mass flow body and appearing eccentric problem at the in-process of going into the shell. In addition, the second concave portion can also be used as a limiting portion. The current collector may be fitted through the second recess and a stopper of another component (e.g., a lower plastic) to define the position of the current collector.

In some embodiments, the number of the second concave portions is two, and the two second concave portions are respectively located at end sides of the bent portion.

When the second concave part is used as the current collector for bending, the bending part can bend along the two second concave parts at the two ends of the bending part, so that the folding part can be bent. This arrangement provides better stability of the current collector folding. When the second concave part is used as the limiting part, the two second concave parts positioned at the two ends of the bending part can play a better stable positioning role on the whole current collector.

In some embodiments, at least two of the second recesses are spaced apart from each other on the same side of the bending portion.

When the second concave part is used as a current collector in a bending mode, the current collector is better in folding stability due to the arrangement.

In some embodiments, two of the second recesses spaced along the same side of the bending portion have different shapes and/or sizes.

The second recesses can thus be provided in different shapes or different sizes depending on the specific function of the second recesses.

In some embodiments, the kink portion comprises a first end side and a second end side connected, the first end side having at least one of the second recesses and the second end side having at least one of the second recesses.

The second recesses thus situated on different end sides can serve an unused functional role to avoid mutual interference.

In some embodiments, the folded part includes at least a part of at least two stacked folded pieces, the second recess includes at least one second sub-recess, at least one of the folded pieces has at least one second sub-recess, and the second sub-recesses are located at end sides of the folded pieces.

When the second concave part is used as the current collector in a bending mode, the folded stability of the current collector is better due to the arrangement, the bent current collector is not easy to wrinkle, and the current collector flow guiding is facilitated. When the second concave portion is used as a stopper portion, the second concave portion provided in this way can be easily engaged with another member for stopper.

In some embodiments, the at least two folds include a third fold and a fourth fold, the third fold and the fourth fold being arranged in a stack, the third fold having the second sub-recess, the fourth fold having the second sub-recess, the second sub-recess of the third fold and the second sub-recess of the fourth fold being arranged in a stack.

When the second concave part is bent as the current collector and is used, the folded stability of the current collector is better by the arrangement, and the current collector can be ensured to have better flow guiding effect. In addition, when the second concave portion is used as a stopper portion. The second sub-recess is stacked to provide a better stability when the second recess is engaged with the position-limiting member of another component (e.g., a lower plastic).

In some embodiments, the number of the folding pieces is multiple, each folding piece has the second sub-concave portion, and the second sub-concave portions located on the same side of the bending portion are stacked.

When the second concave part is used as the current collector in a bending mode, the folded stability of the current collector is better due to the arrangement, and the current collector can be guaranteed to have a better flow guiding effect. When the second concave part is used as a limiting part, the second concave part arranged in the way is easy to limit and match with other parts, and the structural stability of matching of the second concave part and other parts is better

In some embodiments, two ends of at least one of the folding members are respectively provided with one of the second sub-recesses, and the two second sub-recesses of the folding member are symmetrically arranged.

So when the second concave part is buckled as the mass flow body and is used, be favorable to folding assembly to buckle to can make the folding stability of mass flow body better.

In certain embodiments, the second sub-recess is an arcuate slot.

Therefore, when the second concave part is used as a current collector in a bending mode, the folding stability of the current collector can be better, and the current collector can be prevented from interfering with the current collector or other parts when being folded; when the second concave part is used as the limiting part, the difficulty of limiting and matching the second concave part and other parts can be reduced, and the structural stability of matching the second concave part and other parts can be improved.

In some embodiments, the bending portion includes a first bending portion, a second bending portion and a second folding portion, the second folding portion is located between the first bending portion and the second bending portion, the second folding portion is connected to the second concave portion, and the first bending portion can be bent relative to the second bending portion along the second folding portion.

The second concave part is connected to the second crease portion, and when first kink was buckled for the second kink along the second crease portion, can promote the folding stability of mass flow body, is difficult to the dislocation when also can making the mass flow body buckle.

In some embodiments, the second fold portion is recessed relative to the first fold portion and the second fold portion is recessed relative to the second fold portion when the first fold portion and the second fold portion are in the flattened state.

So it is favorable to first kink to follow second kink for the second kink bending of second kink.

In some embodiments, the second fold portion is formed by a portion of the at least two folded pieces arranged in a stack, the first fold portion includes a portion of the at least two folded pieces arranged in a stack, and the second fold portion includes a portion of the at least two folded pieces arranged in a stack.

In some embodiments, the first fold portion after being folded along the second fold portion has a gap.

Follow after the second crease portion is buckled first kink has the clearance, can reserve the buffering space for the folded piece after buckling, can avoid the mass flow body at the in-process of vibration especially when vibrating fatigue like this, cracked problem appears to the extension mass flow body's life.

In some embodiments, the number of the second concave portions is two, two of the second concave portions are respectively located at two ends of the second fold portion, and the second fold portion connects the two second concave portions.

The second crease portion connects two second recesses, and the both ends of second crease portion all have the second recess promptly, so compare in only the one end of second crease portion have the second recess, when first kink is buckled for the second kink along second crease portion, can further promote the stability that the mass flow body is folded, be difficult to the dislocation when also can making the mass flow body buckle.

In some embodiments, the second fold comprises at least a portion of at least two of the folded pieces in a stack, the second fold comprises two or more second sub-folds, at least one of the folded pieces has the second sub-folds, and the two or more second sub-folds are arranged in a stack.

At least one folder has the sub-crease portion of second, and is located the range upon range of setting of the sub-crease portion of second on the different folders, so when first kink is buckled for the second kink along the second crease portion, can promote the folding stability of mass flow body, be difficult to the dislocation when also enabling the mass flow body to buckle, the degree of accuracy when making the mass flow body buckle is higher.

In some embodiments, there is a gap between at least two adjacent folding members in the folded condition of the folding assembly.

So can reserve the buffering space for the folded piece after buckling to can avoid the mass flow body at the in-process of vibration especially when the vibration is tired, cracked problem appears, thereby the life of extension mass flow body.

In some embodiments, the length of at least one of the folds is greater than the distance between any two points of the body.

So can carry out great degree buckling, the effect of mass flow body buffering vibration can be strengthened.

In some embodiments, orthographic projections of the two adjacent folded folding pieces on the body at least partially overlap.

So be favorable to preventing the mass flow body to appear eccentric problem in going into the shell in-process.

In certain embodiments, the body has at least one through hole extending through the body.

The body is provided with at least one through hole, which is beneficial to the circulation of electrolyte and/or the reduction of the local thickness of the body.

In certain embodiments, the at least one through-hole comprises at least one first through-hole, and an orthographic projection of the folding assembly on the body covers at least a portion of the first through-hole with at least a portion of the folding assembly bent relative to the body.

Electrolyte in the battery can circulate through the first through hole, so that the electrolyte can be uniformly distributed in the battery.

In certain embodiments, the at least one through hole comprises at least one second through hole, and an orthographic projection of the folding assembly on the body covers zero area of the second through hole under a condition that at least part of the folding assembly is bent relative to the body.

Because the second through hole is seted up to the body, so be favorable to reducing the local thickness of body to reduce the quality of mass flow body.

In certain embodiments, the at least one second through-hole is located on the same side of the folded assembly as the folded assembly is folded at least partially relative to the body.

In some embodiments, the number of the second through holes is two or more, at least two of the second through holes are arranged at intervals, and the interval between two of the second through holes arranged at intervals is smaller than the width of the folding piece.

In some embodiments, the number of the second through holes is two or more, and any two of the second through holes are arranged at intervals.

In some embodiments, the number of the second through holes is two or more, and a connecting line between the shortest distances of any two adjacent second through holes is located outside an orthogonal projection of the folded assembly on the body after being folded.

Because the second through hole is seted up to the body, so be favorable to reducing the local thickness of body to reduce the quality of mass flow collector.

In some embodiments, the number of the second through holes is two or more, and at least a portion of a connecting line between the shortest distances of any two adjacent second through holes is covered by an orthogonal projection of the folded assembly on the body after being folded.

In some embodiments, the second through hole is circular.

Thus being beneficial to the processing of the body.

In some embodiments, one end of the bending part, which is away from the connecting part, is provided with a channel, the channel is used for connecting a pole, at least part of the pole is located in the channel, and the channel is located in the middle of one end of the bending part, which is away from the connecting part.

The passageway sets up in the middle part of kink, when the kink passes through the passageway and connects utmost point post, can effectively increase the stability of being connected between utmost point post and the kink.

In some embodiments, the bending portion includes at least a portion of at least two stacked folding pieces, each folding piece is provided with a third through hole, and at least two third through holes are stacked to form the channel.

Because the third through-hole has all been seted up to every folded piece for whole folding assembly is worn to establish by utmost point post, strengthens the stability of being connected between mass flow body and the utmost point post.

In some embodiments, one end of the bending part, which is far away from the connecting part, is provided with two channels, the channels are used for connecting a pole, at least part of the pole is located in the channels, and the two channels are arranged at intervals.

So can make the mass flow body be connected with two utmost point posts simultaneously to can make the stability of being connected between mass flow body and the battery better.

In some embodiments, the bending portion includes a first end and a second end, the first end is an end of the bending portion away from the connecting portion, the second end is close to the connecting portion relative to the first end, the first end has a width greater than that of the second end, and the first end has the two channels.

On one hand, the width of the first end is larger than that of the second end, so that the normal overcurrent capacity of the current collector can be ensured; on the other hand, owing to set up two passageways, can make the mass flow body be connected with two utmost points posts simultaneously to can make the connection stability between mass flow body and the battery better.

In some embodiments, the distance between the edges of two of the channels is less than the width of the second end.

So for the edge of two passageways all includes the structure of partial mass flow body, guarantees the stability of being connected between mass flow body and the utmost point post.

In some embodiments, the recess includes a third recess, the bend has at least one third recess, the at least one third recess is located at an end side of the bend, the third recess is located between the first end and the second end, and the bend is capable of bending along the third recess.

This can facilitate folding of the folding assembly, i.e., the current collector. In addition, can also guarantee that the mass flow body is folding according to the assigned direction to when subsequent assembly battery, be favorable to preventing the mass flow body and appearing eccentric problem at the in-process of going into the shell.

In some embodiments, the at least two folds include a fifth fold and a sixth fold, the fifth fold having a thickness less than a thickness of the sixth fold.

Due to the fact that the thickness of the folding piece is different, the overall structural strength of the folding assembly can be guaranteed, bending of the folding assembly is facilitated, and meanwhile the overcurrent capacity of the folding assembly as a conductive piece is guaranteed. In addition, the corresponding matching can be carried out according to the design conditions of other components (such as the lower plastic or the form of a tab or the structure of a pole) of the battery, so as to improve the space where the current collector can be arranged.

In certain embodiments, the number of the fifth folds is at least two, and the at least two fifth folds are arranged one above the other.

So both can guarantee the holistic structural strength of folding assembly, avoid folding assembly's folding piece when the in-process of vibration especially vibration is tired, cracked problem appears, also be convenient for folding assembly buckle, guarantee folding assembly simultaneously as electrically conductive ability of overflowing of piece. Moreover, it should be noted that, in the technical verification test, it is found that even if one or two of the fifth folding pieces are broken, the current collector can still realize normal overcurrent as a conductive adaptor.

In certain embodiments, the sixth fold is located on one side of the at least two fifth folds in the stacked arrangement.

So as to ensure the integral structural strength of the folding assembly.

In certain embodiments, the thickness of the fifth fold is between 5% and 95% of the thickness of the sixth fold.

The thickness of the fifth folding part and the sixth folding part can be set according to the specific application environment. In addition, the corresponding matching can be carried out according to the design conditions of other components (such as the lower plastic or the form of a tab or the structure of a pole) of the battery, so as to improve the space where the current collector can be arranged.

In certain embodiments, the thickness of the fifth fold is between 8% and 50% of the thickness of the sixth fold.

So both can guarantee the holistic structural strength of folding assembly, avoid folding assembly's folding piece when the in-process of vibration especially vibration is tired, cracked problem appears, folding assembly's of also being convenient for buckling guarantees folding assembly simultaneously and regards as the ability of overflowing of electrically conductive piece. In addition, because the thickness of sixth folded piece is thicker, the folded piece number of piles that the folded assembly wholly set up can be less relatively like this to reduce the current collector and set up the space that occupies in the battery, and can reduce the manufacturing cost of current collector. In addition, the folding assembly is not easy to wrinkle when being bent.

In certain embodiments, the thickness of the fifth fold is 45% to 95% of the thickness of the sixth fold.

So both can guarantee the holistic structural strength of folding assembly, avoid folding assembly's folded piece when the in-process of vibration especially vibration is tired, cracked problem appears, folding assembly's of also being convenient for buckling, guarantee folding assembly simultaneously as the ability of overflowing of electrically conductive piece. In addition, the thicknesses of the fifth folding piece and the sixth folding piece are similar, the consistency of the integral structure of the folding assembly is better, and the overflowing is more balanced. Moreover, each folding piece can be arranged to be thin, the whole flexibility is good, and the bending effect is better.

In certain embodiments, the thickness of each of the folds is in the range of [0.05mm,0.3mm ].

The thickness of each folding piece is in the range of [0.05mm,0.3mm ], so that the problem that the current collector is easy to break when in vibration fatigue can be solved, and the normal folding of the current collector is not influenced.

In some embodiments, a side of the body remote from the folding assembly has an avoidance gap extending through a portion of the edge of the body.

Because the body edge is equipped with dodges the breach, dodge the breach and can be used for dodging explosion-proof valve.

An end cap assembly for a battery in an embodiment of the present application includes a cover plate and the current collector of any of the above embodiments, wherein the cover plate is connected to the current collector.

In the end cover assembly of this application, set up to multilayer structure through the folding assembly with in the mass flow body, so be favorable to increasing folding assembly's rigidity, reduce the cracked possibility of folding assembly to solve the mass flow body and easily cracked problem when vibration is tired, with the life of extension end cover assembly.

The battery in this application embodiment includes naked electric core, shell and the end cover subassembly in above-mentioned embodiment, the at least part of naked electric core hold in the shell, the end cover subassembly with naked electric core is connected.

In the battery of this application, set up to multilayer structure through the folding subassembly with in the mass flow body, so be favorable to increasing folding subassembly's rigidity, reduce the cracked possibility of folding subassembly to solve the mass flow body and easily cracked problem when vibration is tired, with the life of extension battery.

In some embodiments, the housing has a cylindrical shape, and a direction parallel to a center line of the cylindrical shape is defined as a first direction, and at least a part of an orthographic projection of the folded assembly in the first direction after being folded falls on the body.

Because the orthographic projection of the folded assembly after being bent in the first direction is at least partially fallen onto the body, the problem of eccentricity is favorably prevented.

In certain embodiments, at least a portion of an orthographic projection of the folded assembly in the first direction after bending falls on the bare cell.

Because folding assembly after buckling is on naked electric core is fallen on to the at least part of the orthographic projection of first side, so be favorable to the cooperation of mass flow body and naked electric core.

In some embodiments, the bare cell includes a tab, the tab is used for connecting with the body, and at least part of the orthographic projection of the folded assembly in the first direction after bending falls on the tab.

Because folding assembly after buckling is on the utmost point ear on the orthographic projection of first side at least part, so be favorable to the cooperation of mass flow body and naked electric core.

The battery pack according to the embodiment of the present application includes a battery case and the battery according to any one of the above embodiments. At least part of the battery is accommodated in the battery pack.

In the battery package of this application, set up to multilayer structure through the folding assembly in the mass flow body with the battery, so be favorable to increasing folding assembly's rigidity, reduce the cracked possibility of folding assembly to solve the easy cracked problem of mass flow body when vibration is tired, with the life of extension battery.

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

Drawings

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

fig. 1 is a schematic perspective view of a current collector in certain embodiments of the present application;

fig. 2 is a schematic perspective exploded view of a current collector in certain embodiments of the present application;

fig. 3 is a schematic perspective view of a bent current collector according to some embodiments of the present disclosure;

fig. 4 is a schematic view of an orthographic projection of a bent portion and a connecting portion on a body after bending a current collector in some embodiments of the present application;

fig. 5 is a schematic perspective view of a folded piece of a current collector according to some embodiments of the present disclosure;

fig. 6 is a schematic exploded perspective view of a folded piece in a current collector in accordance with certain embodiments of the present application;

fig. 7 is a schematic perspective view of a folded piece of a current collector in accordance with certain embodiments of the present application;

fig. 8 is a schematic exploded perspective view of a folded piece of a current collector in certain embodiments of the present application;

fig. 9 and 10 are schematic perspective views of current collectors according to certain embodiments of the present disclosure;

fig. 11 is a schematic perspective exploded view of a current collector in certain embodiments of the present application;

fig. 12 is a schematic perspective view of a current collector and a terminal according to some embodiments of the present disclosure;

FIG. 13 is a schematic diagram of the structure of a battery in certain embodiments of the present application;

FIG. 14 is a schematic perspective view of a battery according to certain embodiments of the present application;

fig. 15 is a schematic diagram of a battery pack according to some embodiments of the present application.

Description of the main element symbols:

current collector 100

Body 10, through hole 11, first through hole 111, second through hole 112, dodge breach 12

The folding assembly 20, the folding member 21, the bending portion 22, the sub-bending portion 221, the first bending portion 223, the first sub-bending portion 2231, the second bending portion 222, the second sub-bending portion 2221, the first end side 2201, the second end side 2202, the first end 2203, the second end 2204, the connecting portion 23, the sub-connecting portion 231, the recess 40, the first recess 25, the first sub-recess 251, the first folding portion 26, the first sub-folding portion 261, the second recess 27, the second sub-recess 271, the second folding portion 28, the second sub-folding portion 281, the third recess 29, the channel 30, and the third through hole 31

End cover assembly 1000 and cover plate 300

A battery 2000, a pole 200, a bare cell 400, a tab 401, a shell 500,

Detailed Description

Embodiments of the present application will be further described below with reference to the accompanying drawings. The same or similar reference numbers in the drawings identify the same or similar elements or elements having the same or similar functionality throughout.

In addition, the embodiments of the present application described below in conjunction with the accompanying drawings are exemplary and are only for the purpose of explaining the embodiments of the present application, and are not to be construed as limiting the present application.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

Referring to fig. 1 and fig. 2, the present embodiment provides a current collector 100, wherein the current collector 100 includes a body 10 and a folding assembly 20. At least a portion of the folding assembly 20 is capable of being bent relative to the body 10. The folding assembly 20 comprises at least two stacked folding members 21 provided with at least one recess 40. The bent portion is easily broken during vibration of the current collector 100, especially when the vibration is fatigued. However, since in the current collector 100 of the present application, the folding assembly 20 includes at least two folding members 21 stacked together, it is advantageous to increase the rigidity of the folding assembly 20 and reduce the possibility of fracture of the folding assembly 20, so as to solve the problem that the current collector 100 is prone to fracture when subjected to vibration fatigue, thereby prolonging the service life of the current collector 100.

Specifically, the folding assembly 20 includes a plurality of stacked folding members 21. Wherein a plurality of folding members 21 can be attached together by adhesive to form the folding assembly 20. As shown in fig. 2, the folding assembly 20 comprises five folding members 21. Five folding members 21 are stacked together to form the folding assembly 20.

In some embodiments, the length of at least one of the folds 21 is greater than the distance between any two points of the body 10. In this way, the folded piece 21 can be bent to a large extent, and the vibration damping effect of the current collector 100 can be enhanced. Illustratively, as shown in fig. 2, the folding assembly 20 includes five folding members 21, and the lengths of the five folding members 21 are the same and are greater than the distance between any two points of the body 10.

Referring to fig. 1, in some embodiments, the width of at least one of the folding members 21 is smaller than the width of the body 10 between the two sides of the folding member 21. Thus, not only can the normal flow capacity of the current collector 100 be ensured, but also the interference effect caused by the too wide folded piece 21 during installation can be avoided. As shown in fig. 2, the folding assembly 20 includes five folding members 21, and the widths of the five folding members 21 are the same and smaller than the width of the body 10 between both sides of the folding members 21.

Referring to fig. 1 and 2, in some embodiments, the folding assembly 20 includes a bending portion 22 and a connecting portion 23, the bending portion 22 is connected to the body 10 through the connecting portion 23, and the bending portion 22 can be bent relative to the bending portion 22. Specifically, each of the folding members 21 includes a sub-bending portion 221 and a sub-connecting portion 231, and when the plurality of folding members 21 are stacked to form the folding assembly 20, the plurality of sub-bending portions 221 are stacked to form the bending portion 22, and the plurality of sub-connecting portions 231 are stacked to form the connecting portion 23. The bending portion 22 is connected to the body 10 through a connecting portion 23, and the bending portion 22 can be bent relative to the connecting portion 23, so as to realize that the bending portion 22 is bent relative to the body 10. Wherein, the connecting portion 23 can be welded with the body 10 as a whole, so that the multi-layer folding assembly 20 and the body 10 can be tightly connected, and the reliability of the connection of the multi-layer folding assembly 20 and the body 10 can be ensured.

Further, in some embodiments, the thickness of the connection portion 23 is greater than that of the body 10, so that the structural strength of the connection portion 23 and the body 10 can be ensured.

It should be noted that in some embodiments, the body 10 may adopt a single-layer hard disk-shaped structure, which may reduce the manufacturing cost of the current collector 100 and at the same time facilitate the production and manufacturing. Of course, in some embodiments, the body 10 may also be a multi-layer structure, and is not limited herein. For convenience of description, the embodiments of the present application are all described by taking the body 10 as a single-layer hard disk-shaped structure as an example.

In some embodiments, at least a portion of the connecting portion 23 is fixedly connected to one side of the body 10. Wherein at least a portion of the connecting portion 23 may be welded with the body 10 as one body. Therefore, the multi-layer folding assembly 20 and the body 10 can be firmly connected, and the reliability of the connection of the multi-layer folding assembly 20 and the body 10 is ensured.

For example, referring to fig. 1 and 2, in some embodiments, the folding assembly 20 includes a folding member a1, a folding member a2, a folding member a3, a folding member a4, and a folding member a5. The folded piece a2 is stacked on the folded piece a1, the folded piece a3 is stacked on the folded piece a2, the folded piece a4 is stacked on the folded piece a3, the folded piece a5 is stacked on the folded piece a4, and one end of the folded piece a1 sub-connecting part 231, which is far away from the sub-bending part 221, is connected with the body 10. In this way, at least part of the connecting portion 23 can be fixedly connected with one side of the body 10.

In the embodiment shown in fig. 2, the current collector 100 may be formed by connecting the folded piece a1 to the body 10, and then laminating the folded piece a2 on the folded piece a1, the folded piece a3 on the folded piece a2, the folded piece a4 on the folded piece a3, and the folded piece a5 on the folded piece a 4. Of course, the five folding members 21 may be first combined into the folding assembly 20 and then connected to the body 10, which is not limited herein.

Referring to fig. 3, fig. 3 shows the folding assembly 20 after being bent relative to the body 10. In some embodiments, an orthographic projection of the bent portion 22 on the body 10 covers at least a portion of the connecting portion 23.

Referring to fig. 3 and 4 again, in some embodiments, an orthographic area of the bent portion 22 on the body 10 is larger than an orthographic area of the connecting portion 23 on the body 10. Fig. 4 is a schematic view of the projection of the bent portion 22 and the connecting portion 23 on the body 10 after the bent portion 22 is bent. In fig. 4, S1 indicates an orthographic projection of the bent portion 22 on the main body 10, and S2 indicates an orthographic projection of the connecting portion 23 on the main body 10, and it can be seen that an area of the orthographic projection S1 of the bent portion 22 on the main body 10 is larger than an area of the orthographic projection S2 of the connecting portion 23 on the main body 10. On one hand, the area of the bent part 22 after bending is larger, so that the overcurrent capacity of the current collector 100 can be ensured, and the current collector 100 can have a larger heat dissipation area, which is beneficial to heat dissipation; on the other hand, since the area of the connecting portion 23 is relatively small, the area occupied by the body 10 when the connecting portion is welded to the body 10 is small, so that the body 10 is ensured to reserve a sufficient space for welding the tab, and then the overcurrent capacity of the current collector 100 is ensured.

Further, in some embodiments, at least a portion of an orthogonal projection of the bent portion 22 on the body 10 after bending overlaps an orthogonal projection of the connecting portion 23 on the body 10. That is, the main portion of the bent portion 22 is located right above the body 10, which is beneficial to prevent the current collector 100 from being eccentric during the encasing process.

Furthermore, in some embodiments, orthographic projections of two adjacent folded folding members 21 on the body 10 at least partially overlap. In particular, in some embodiments, the orthographic projections of two adjacent folded pieces 21 on the body 10 are completely overlapped, which is beneficial to prevent the current collector 100 from generating an eccentricity problem during the casing process.

Referring to fig. 5, in some embodiments, the recess 40 includes a first recess 25, the connection portion 23 and the bending portion 22 has at least one first recess 25, and the at least one first recess 25 is located at an end side of the connection portion. Illustratively, the junction includes two opposing end sides, at least one of which is provided with a first recess 25. Since at least one first concave portion 25 is formed at the connection portion 23 and the bent portion 22, the bent portion 22 can be bent relative to the connection portion 23 along the first concave portion 25, so as to facilitate the folding of the folding assembly 20, i.e., the folding of the current collector 100. In addition, the current collector 100 can be folded in a designated direction, and the current collector 100 is prevented from being eccentric in the process of being placed into the shell when the battery 2000 is assembled subsequently.

In some embodiments, the first recess 25 may also serve as a stop. Illustratively, in one example, the current collector 100 may be fitted through the first recess 25 and a stopper of another component (e.g., a lower plastic) to define the position of the current collector 100. This can reduce the complexity of assembly of the battery 2000.

Further, referring to fig. 5, in some embodiments, the number of the first concave portions 25 is two, and the two first concave portions 25 are respectively located at two ends of a connection portion of the bending portion 22 and the connecting portion 23. When the first concave portion 25 is used for bending the current collector 100, since the two first concave portions 25 are respectively located at two ends of a connection portion of the bent portion 22 and the connection portion 23, the bent portion 22 can be bent relative to the connection portion 23 along the two first concave portions 25 located at two ends of the connection portion of the bent portion 22 and the connection portion 23, so as to facilitate bending of the folding assembly 20, and thus the stability of folding the current collector 100 can be better. When the first concave portion 25 is used as the limiting portion, since the two first concave portions 25 are respectively located at the two ends of the connection portion, a better stable positioning effect can be performed on the whole current collector 100.

Referring to fig. 5 and 6, the joint includes at least a portion of at least two stacked folded pieces 21, the first concave portion 25 includes at least one first sub-concave portion 251, at least one folded piece 21 has the first sub-concave portion 251, and the first sub-concave portion 251 is located at an end side of the folded piece 21. When the first concave part 25 is used as the current collector 100 for bending, since the connection part includes at least two stacked folded pieces 21, the first concave part 25 includes at least one first sub-concave part 251, and the end side of at least one folded piece 21 has the first sub-concave part 251, so that the stability of folding the current collector 100 can be improved, and the bent current collector 100 is not prone to wrinkle, which is beneficial to the current conduction of the current collector 100. When the first concave part 25 is used as a limiting part, since the joint comprises at least part of at least two stacked folding pieces 21, the first concave part 25 comprises at least one first sub-concave part 251, and the end side of at least one folding piece 21 is provided with the first sub-concave part 251, so that the difficulty of limiting and matching the first concave part 25 and other parts is reduced.

For example, in some embodiments, the at least two folding members 21 include a first folding member 21 and a second folding member 21, the first folding member 21 and the second folding member 21 are stacked, the first folding member 21 has a first sub-concave portion 251, the second folding member 21 has a first sub-concave portion 251, and the first sub-concave portion 251 of the first folding member 21 and the first sub-concave portion 251 of the second folding member 21 are stacked. Because the first sub-concave portion 251 of the first folding member 21 and the first sub-concave portion 251 of the second folding member 21 are stacked when the first folding member 21 and the second folding member 21 are stacked, when the first concave portion 25 is used as the current collector 100 for bending, the folding stability of the current collector 100 can be improved, and the current collector 100 can be ensured to have a good flow guiding effect; when the first concave portion 25 is used as a stopper portion, the first sub-concave portion 251 provided in a stacked manner can improve stability when the first concave portion 25 is engaged with a stopper of another member (for example, a lower plastic) for stopper.

For another example, referring to fig. 6, in some embodiments, the number of the folding members 21 is multiple, each folding member 21 has a first sub-concave portion 251, and the multiple first sub-concave portions 251 located on the same side of the connection are stacked. Because the plurality of first sub-recesses 251 located on the same side of different folding pieces 21 are stacked when the plurality of folding pieces 21 are stacked, when the first recesses 25 are used as the current collector 100 for bending, the folding stability of the current collector 100 can be better, and the current collector 100 can be ensured to have a better flow guiding effect; when the first recess 25 is used as a stopper, the difficulty of fitting the first recess 25 to another member for stopper can be reduced, and the structural stability of the fitting of the first recess 25 to another member can be improved.

Specifically, as shown in fig. 5 and 6, fig. 6 is an exploded view of the folding assembly 20, and fig. 5 is a view illustrating a plurality of folding members 21 stacked. The folding assembly 20 includes a folding member a1, a folding member a2, a folding member a3, a folding member a4, and a folding member a5. The folding pieces a1, a2, a3, a4 and a5 each include a sub-bending portion 221 and a sub-connecting portion 231, and the two ends of the connection between the sub-bending portion 221 and the sub-connecting portion 231 of each folding piece 21 respectively have a first sub-recess b1 and a second sub-recess b2. When the folded piece a1, the folded piece a2, the folded piece a3, the folded piece a4 and the folded piece a5 are stacked, the first sub-concave portion B1 positioned at one side of the connection between the sub-bending portion 221 and the sub-connection portion 231 of the folded piece a1, the folded piece a2, the folded piece a3, the folded piece a4 and the folded piece a5 is stacked to form a first concave portion B1; the first sub-recesses B2 located at the other side of the connection of the sub-bending portion 221 and the sub-connection portion 231 of the folded piece a1, the folded piece a2, the folded piece a3, the folded piece a4, and the folded piece a5 are stacked to form the first recesses B2. The first concave portion B1 and the first concave portion B2 are located at both ends of the joint.

Wherein, in some embodiments, the first sub-concave portion 251 may be an arc-shaped slot. In this way, when the first concave portion 25 is used as the current collector 100 by being bent, the folding stability of the current collector 100 can be improved, and the interference action on itself or other parts when the current collector 100 is folded can be prevented; when the first recess 25 is used as a stopper, the difficulty of fitting the first recess 25 to another member for stopper can be reduced, and the structural stability of fitting the first recess 25 to another member can be improved.

Referring to fig. 5, in some embodiments, the connection portion includes a first folding portion 26, the first folding portion 26 is connected to the first concave portion 25, and the bending portion 22 can be bent along the first folding portion 26 relative to the connection portion 23. Since the first folding portion 26 is connected to the first concave portion 25, when the bending portion 22 is bent along the first folding portion 26 with respect to the connection portion 23, the folding stability of the current collector 100 can be improved, and the current collector 100 can be less likely to be misaligned when being bent.

Specifically, the number of the first concave portions 25 is two, the two first concave portions 25 are respectively located at both ends of the connection, the first fold portion 26 connects the two first concave portions 25, and the first fold portion 26 is located between the two first concave portions 25. Since the first folding line portion 26 is located between the two first concave portions 25, that is, both ends of the first folding line portion 26 have the first concave portions 25, compared to the case where only one end of the first folding line portion 26 has the first concave portion 25, when the bending portion 22 is bent relative to the connecting portion 23 along the first folding line portion 26, the stability of folding the current collector 100 can be further improved, and the current collector 100 is not easily dislocated when being bent.

Referring to fig. 5 and 6, in some embodiments, the first fold 26 includes at least a portion of at least two stacked folding members 21, the first fold 26 includes two or more first sub-folds 261, at least one folding member 21 has a first sub-fold 261, and the two or more first sub-folds 261 are stacked. Because at least one folding piece 21 is last to have first sub-crease portion 261, and is located the range upon range of setting of first sub-crease portion 261 on different folding pieces 21, so when the kink 22 is buckled for connecting portion 23 along first crease portion 26, can promote the stability that current collector 100 was folded, be difficult to the dislocation when also enabling current collector 100 to buckle, the degree of accuracy when making current collector 100 buckle is higher.

For example, as shown in fig. 5 and 6, fig. 6 is an exploded view of the folding assembly 20, and fig. 5 is a view illustrating a plurality of folding members 21 stacked. The folding assembly 20 includes a folding member a1, a folding member a2, a folding member a3, a folding member a4, and a folding member a5. The folding pieces a1, a2, a3, a4 and a5 each include a sub-bending portion 221 and a sub-connecting portion 231, the two ends of the connection between the sub-bending portion 221 and the sub-connecting portion 231 of each folding piece 21 have first sub-recesses 251, and each folding piece 21 has a first sub-fold portion 261 connecting the two first sub-recesses 251. When the folded piece a1, the folded piece a2, the folded piece a3, the folded piece a4, and the folded piece a5 are stacked, the first sub-fold portions 261 located in the folded piece a1, the folded piece a2, the folded piece a3, the folded piece a4, and the folded piece a5 are stacked to form the first fold portion 26.

Referring to fig. 5, in some embodiments, the recess 40 includes a second recess 27, the bending portion 22 has at least one second recess 27, and the at least one second recess 27 is located at an end side of the bending portion 22. Wherein, in some embodiments, the bent portion 22 can be bent along the second concave portion 27 to facilitate the folding of the folding assembly 20, i.e., the folding of the current collector 100. In addition, the current collector 100 can be folded in a designated direction, and the current collector 100 can be prevented from being eccentric in the process of entering the shell when the battery 2000 is assembled subsequently.

In some embodiments, the second recess 27 may also serve as a stop. Illustratively, in one example, the current collector 100 may be fitted through the second recess 27 and a stopper of another component (e.g., a lower plastic) to define the position of the current collector 100. This can reduce the complexity of assembling the battery 2000.

Specifically, referring to fig. 5, in some embodiments, the number of the second recesses 27 is two, and the two second recesses 27 are respectively located at the end sides of the bending portion 22. When the second concave portion 27 is used for bending the current collector 100, since the two second concave portions 27 are respectively located at the end sides of the bent portion 22, the bent portion 22 can be bent along the two second concave portions 27 located at the two ends of the bent portion 22, which is beneficial for bending the folding assembly 20, so that the folding stability of the current collector 100 can be better. When the second concave portion 27 is used as a stopper, the two second concave portions 27 located at the two ends of the bent portion 22 can perform a better stable positioning function on the entire current collector 100.

It should be noted that, in some embodiments, the bent portion 22 may have both the second concave portion 27 used as a bending portion of the current collector 100 and the second concave portion 27 used as a limiting portion. That is, the bent portion 22 includes at least two second recesses 27, and a portion of the second recesses 27 is used as the second recesses 27 for bending the current collector 100, and the bent portion 22 can be bent along the portion of the second recesses 27; another part of the second recess 27 is used as a position limiting part, and the position of the current collector 100 can be limited by the part of the second recess 27 and a position limiting part of another component.

In some embodiments, the specific functions of the second concave portion 27 disposed on the same side of the bent portion 22 may be different. For example, referring to fig. 5, in some embodiments, at least two second recesses 27 are disposed at intervals on the same side of the bending portion 22. Specifically, in some examples, one or two or more of the second recesses 27 may be used for bending the current collector 100, and the remaining one or two or more of the second recesses 27 may be used as a limiting part to be matched with a limiting part of another component through the second recesses 27 to limit the position of the bent current collector 100.

For example, as shown in fig. 5, the bent portion 22 includes three second recesses 27, i.e., a second recess C1, a second recess C2, and a second recess C3. The second concave portion C1 and the second concave portion C2 are disposed at an interval on one side of the bending portion 22, the second concave portion C3 is disposed on the other side of the bending portion 22, and the second concave portion C2 corresponds to the second concave portion C3. The second concave portion C1 serves as a stopper to define the position of the bent current collector 100 by the second concave portion C1 cooperating with stoppers of other parts. The second concave portions C2 and C3 are used for bending the current collector 100, and the bent portions 22 can be bent along the second concave portions C2 and C3, so as to facilitate bending of the folding assembly 20, thereby improving the stability of folding the current collector 100.

Further, in some embodiments, the two second recesses 27 spaced along the same side of the bent portion 22 are different in shape and/or size. Since the two second recesses 27 spaced on the same side have different shapes and/or sizes, even if the two second recesses 27 having different functions are disposed on the same side of the bent portion 22, the two second recesses 27 having different specific functions can be easily distinguished according to the shapes and/or sizes of the second recesses 27. For example, when the corresponding second recess 27 is used as a stopper, the size of the second recess 27 may be set relatively small; when the corresponding second recess 27 is used as the current collector 100 by bending, the size of the second recess 27 may be set relatively large.

In some embodiments, it is also possible to provide second recesses 27 with different specific functions on different sides of the fold 22. For example, referring to fig. 7, in some embodiments, the bending portion 22 includes a first end side 2201 and a second end side 2202 connected, the first end side 2201 has at least one second recess 27, and the second end side 2202 has at least one second recess 27. The second recesses 27 thus situated on different end sides can serve different functional functions in order to avoid mutual interference.

For example, as shown in fig. 7, the bent portion 22 includes two second recesses 27, i.e., a second recess C1 and a second recess C2. The second concave portion C1 is located on the first end 2201 of the bent portion 22 and is used for bending the current collector 100; the second concave portion C2 is located on the second end 2202 of the folded portion 22 and serves as a stopper. That is, the bent portion 22 can be bent along the second concave portion C1, and the position of the bent current collector 100 can be defined by the second concave portion C2 and the limiting member of the other component.

Referring to fig. 5 and 8, in some embodiments, the bending portion 22 includes at least a portion of at least two stacked folded pieces 21, the second concave portion 27 includes at least one second sub-concave portion 271, at least one folded piece 21 has at least one second sub-concave portion 271, and the second sub-concave portion 271 is located at an end side of the folded piece 21. When the second concave portion 27 is used as the current collector 100 for bending, since the second concave portion 27 includes at least one second sub-concave portion 271 and the at least one folding piece 21 has at least one second sub-concave portion 271, the folding stability of the current collector 100 can be better, and the bent current collector 100 is not easily wrinkled, which is beneficial to the flow guiding of the current collector 100. When the second concave portion 27 is used as a limiting portion, since the second concave portion 27 includes at least one second sub-concave portion 271 and at least one folding piece 21 has at least one second sub-concave portion 271, difficulty in limiting and matching the second concave portion 27 with other components can be reduced.

In some embodiments, the at least two folding members 21 include a third folding member 21 and a fourth folding member 21, the third folding member 21 and the fourth folding member 21 are stacked, the third folding member 21 has a second sub-recess 271, the fourth folding member 21 has a second sub-recess 271, and the second sub-recess 271 of the third folding member 21 and the second sub-recess 271 of the fourth folding member 21 are stacked. Because the second sub-concave portion 271 of the third folded piece 21 and the second sub-concave portion 271 of the fourth folded piece 21 are stacked when the third folded piece 21 and the fourth folded piece 21 are stacked, when the second concave portion 27 is used as the current collector 100 for bending, the folding stability of the current collector 100 can be better, and the current collector 100 can be ensured to have a better current guiding function; when the second concave portion 27 is used as a stopper, the second sub-concave portion 271 stacked can improve stability when the second concave portion 27 is engaged with a stopper of another member (for example, lower plastic) for stopper.

Referring to fig. 5 and 8, in some embodiments, the number of the folding pieces 21 is multiple, each folding piece 21 has a second sub-concave portion 271, and the multiple second sub-concave portions 271 located on the same side of the bending portion 22 are stacked. Because the plurality of second sub-recesses 271 located on the same side of different folding pieces 21 are stacked when the plurality of folding pieces 21 are stacked, when the second recesses 27 are used as the current collector 100 for bending, the folding stability of the current collector 100 can be better, and the current collector 100 can be ensured to have a better flow guiding effect; when the second recess 27 is used as a stopper, the difficulty of fitting the second recess 27 to another member for stopper can be reduced, and the structural stability of fitting the second recess 27 to another member can be improved.

Specifically, as shown in fig. 5 and 8, fig. 8 is an exploded view of the folding assembly 20, and fig. 5 is a view illustrating a plurality of folding members 21 stacked. The folding assembly 20 includes a folding member a1, a folding member a2, a folding member a3, a folding member a4, and a folding member a5. The folded pieces a1, a2, a3, a4 and a5 include sub-bending portions 221 and sub-connecting portions 231, and the sub-bending portion 221 of each folded piece 21 includes second sub-recesses c1, c2 and c3. For each folded piece 21, the second sub-concave portion C1 and the second sub-concave portion C2 are disposed on the same side of the folded piece 21, the second concave portion C3 is located on the other side of the folded piece 21, and the second concave portion C3 corresponds to the second sub-concave portion C2. When the folded piece a1, the folded piece a2, the folded piece a3, the folded piece a4, and the folded piece a5 are stacked, the sub-bent portions 221 of the plurality of folded pieces 21 are stacked to form the bent portion 22. The second sub-recesses C1 of the folded piece a1, the folded piece a2, the folded piece a3, the folded piece a4, and the folded piece a5 are stacked to form a second recess C1; the second sub-recesses 271 of the folder a1, the folder a2, the folder a3, the folder a4, and the folder a5 are stacked d2 to form a second recess C2; the second sub-recesses 271 of the folder a1, the folder a2, the folder a3, the folder a4, and the folder a5 are stacked d3 to form a second recess C3. When the second concave portion C2 and the second concave portion C3 are used as the current collector 100 to be bent, that is, the bent portion 22 can be bent along the second concave portion C2 and the second concave portion C3, and the second concave portion C1 is used as a limiting portion, so that the second concave portion C1 is matched with a limiting member of another component to limit the position of the bent current collector 100.

In some embodiments, both ends of at least one of the folding members 21 respectively have one second sub-recess 271, and the two second sub-recesses 271 of the folding member 21 are symmetrically arranged. When the second concave portion 27 is used as the current collector 100, the folding assembly 20 can be bent advantageously, so that the folding stability of the current collector 100 can be improved.

Likewise, in some embodiments, the second sub-recess 271 may be an arcuate slot. In this way, when the second concave portion 27 is used as the current collector 100 by bending, the folding stability of the current collector 100 can be improved, and the interference action on the current collector 100 or other parts when the current collector 100 is folded can be prevented; when the second recess 27 is used as a stopper, the difficulty of fitting the second recess 27 to another member for stopper can be reduced, and the structural stability of fitting the second recess 27 to another member can be improved.

Referring to fig. 5, in some embodiments, the bending portion 22 includes a first bending portion 223, a second bending portion 222 and a second bending portion 28, the second bending portion 28 is located between the first bending portion 223 and the second bending portion 222, the second bending portion 28 is connected to the second recess 27, and the first bending portion 223 can be bent along the second bending portion 28 relative to the second bending portion 222. Since the second folding portion 28 is connected to the second concave portion 27, when the first bending portion 223 is bent along the second folding portion 28 with respect to the second bending portion 222, the stability of folding the current collector 100 can be improved, and the current collector 100 is not easily dislocated when being bent.

Specifically, in some embodiments, the number of the second concave portions 27 is two, two second concave portions 27 are respectively located at both ends of the second fold 28, and the second fold 28 connects the two second concave portions 27. Since the second fold 28 connects the two second recesses 27, that is, the second recesses 27 are disposed at both ends of the second fold 28, compared to the case where only one end of the second fold 28 has the second recess 27, when the first bending portion 223 is bent along the second fold 28 relative to the second bending portion 222, the stability of folding the current collector 100 can be further improved, and the current collector 100 is not easily dislocated when being bent.

Referring to fig. 8, in some embodiments, the second folding portion 28 is formed by at least two folded pieces 21 stacked together, the first folding portion 223 includes at least two folded pieces 21 stacked together, and the second folding portion 222 includes at least two folded pieces 21 stacked together. This facilitates the first bending portion 223 to be bent along the second folding portion 28 relative to the second bending portion 222.

Specifically, in some embodiments, the second fold 28 comprises at least a portion of at least two stacked folds 21, the second fold 28 comprises two or more second sub-folds 281, at least one fold 21 has a second sub-fold 281, and the two or more second sub-folds 281 are arranged in a stack. Because at least one of the folding members 21 has the second sub-folding portion 281, and the second sub-folding portions 281 on different folding members 21 are stacked, when the first bending portion 223 is bent along the second folding portion 28 relative to the second bending portion 222, the stability of folding the current collector 100 can be improved, and the current collector 100 is not easily dislocated when bent, so that the accuracy of bending the current collector 100 is higher.

For example, as shown in fig. 5 and 8, fig. 8 is an exploded view of the folding assembly 20, and fig. 5 is a view illustrating stacking of a plurality of folding members 21. The folding assembly 20 includes 5 folding pieces 21, each folding piece 21 includes a first sub-bending portion 2231, a second sub-bending portion 2221, and a second sub-bending portion 281, wherein the second sub-bending portion 281 is located between the first sub-bending portion 2231 and the second sub-bending portion 2221, and the first sub-bending portion 2231 can be bent relative to the second sub-bending portion 2221 along the second sub-bending portion 281. When five folding pieces 21 are stacked to form the folding assembly 20, the second sub-fold portion 281 of each folding piece 21 is stacked to form the second fold portion 28.

Referring to fig. 5, in some embodiments, under the condition that the first bending portion 223 and the second bending portion 222 are in the flattened state, the second folding portion 28 is recessed relative to the first bending portion 223, and the second folding portion 28 is recessed relative to the second bending portion 222. This facilitates the first bending portion 223 to be bent along the second folding portion 28 relative to the second bending portion 222.

It should be noted that, in some embodiments, the first bending portion 223 after bending along the second folding portion 28 has a gap. Because the first bending part 223 bent along the second folding part 28 has a gap, a buffer space can be reserved for the bent folding part 21, so that the problem that the current collector 100 is broken in the vibration process, especially in the vibration fatigue process, can be avoided, and the service life of the current collector 100 is prolonged.

Furthermore, in some embodiments, there may also be a gap between at least two adjacent folding members 21 in the condition in which the folding assembly 20 is folded. So also can reserve the buffering space for the folded piece 21 after buckling to can avoid the problem that the fracture appears when the in-process of vibration especially vibration is tired of mass flow body 100, thereby prolong the life of mass flow body 100.

Referring to fig. 1 and 9, in some embodiments, the body 10 has at least one through hole 11 penetrating through the body 10. The body 10 is provided with at least one through hole 11, which is beneficial to the circulation of electrolyte and/or is beneficial to reducing the local thickness of the body 10.

For example, referring to fig. 1 and 9, in some embodiments, the at least one through hole 11 includes at least one first through hole 111, and under a condition that at least a portion of the folding element 20 is bent relative to the body 10 (as understood in conjunction with fig. 3), an orthographic projection of the folding element 20 on the body 10 covers at least a portion of the first through hole 111. Here, the electrolyte in the battery 2000 can circulate through the first through hole 111, thereby facilitating the uniform distribution of the electrolyte in the battery 2000.

The above-described "in a condition in which at least a portion of the folding assembly 20 is bent with respect to the body 10" can be understood in conjunction with fig. 3. Specifically, in some examples, after the current collector 100 is installed in the battery 2000, the orthographic projection of the folded assembly 20 on the body 10 after bending covers at least part of the first through hole 111 when the battery 2000 is in normal operation. That is, the above-described "in a condition where at least a portion of the folding assembly 20 is folded with respect to the body 10" may be understood as a configuration that the current collector 100 has when it is mounted in the battery 2000 for use as a conductive member.

For another example, referring to fig. 9, in some embodiments, the at least one through hole 11 may further include at least one second through hole 112, and under a condition that at least a portion of the folding assembly 20 is bent relative to the body 10, an area of the second through hole 112 covered by an orthographic projection of the folding assembly 20 on the body 10 is zero. That is, under the condition that at least a portion of the folding assembly 20 is bent with respect to the body 10, the orthographic projection of the folding assembly 20 on the body 10 cannot cover the second through hole 112.

The above-described "in a condition in which at least a portion of the folding assembly 20 is folded with respect to the body 10" can be understood in conjunction with fig. 3. Specifically, in some examples, after the current collector 100 is installed in the battery 2000, when the battery 2000 is in normal operation, the area of the second through hole 112 covered by the orthographic projection of the folded assembly 20 after being bent on the body 10 is zero. That is, the above-described "in a condition where at least a portion of the folding assembly 20 is folded with respect to the body 10" may be understood as a state after the current collector 100 is mounted in the battery 2000.

It should be noted that the features of the folded assembly 20 described in the present application can be understood as features that the current collector 100 can have after being installed in the battery 2000. Therefore, the description thereof will not be repeated.

On one hand, the second through hole 112 is formed in the body 10, which is beneficial to reducing the local thickness of the body 10, thereby reducing the mass of the current collector 100; on the other hand, since the area of the second through hole 112 covered by the orthographic projection of the folding assembly 20 on the body 10 is zero under the condition that at least part of the folding assembly 20 is bent relative to the body 10, the electrolyte in the battery 2000 cannot flow through the second through hole 112, and thus the normal operation of the battery 2000 can be prevented from being influenced.

In some embodiments, the at least one second through-hole 112 is located on the same side of the folded assembly 20 as the folded assembly 20 is at least partially folded relative to the body 10. Since the body 10 is provided with the second through holes 112, it is beneficial to reduce the local thickness of the body 10, thereby reducing the mass of the current collector 100.

In some embodiments, the number of the second through holes 112 is two or more, and any two of the second through holes 112 are spaced apart. Since the body 10 is provided with the second through holes 112, it is beneficial to reduce the local thickness of the body 10, thereby reducing the mass of the current collector 100.

For example, in some embodiments, the number of the second through holes 112 is two or more, and the spacing between at least two spaced second through holes 112 is smaller than the width of the folding member 21. For another example, in some embodiments, the number of the second through holes 112 is two or more, and a connection line between the shortest distances of any two adjacent second through holes 112 is located outside an orthographic projection of the folded component 20 on the body 10. For another example, in some embodiments, the number of the second through holes 112 is two or more, and at least a portion of a connection line between the shortest distances of any two adjacent second through holes 112 is covered by an orthogonal projection of the folded assembly 20 on the body 10.

It should be noted that in some embodiments, the second through hole 112 is circular to facilitate machining. Of course, in some embodiments, the second through hole 112 may have other shapes, such as a triangle, a rectangle, a diamond, a hexagon, etc., without limitation.

Referring to fig. 10, in some embodiments, an end of the bent portion 22 away from the connecting portion 23 has a channel 30, the channel 30 is used for connecting the terminal 200 (as shown in fig. 12), at least a portion of the terminal 200 is located in the channel 30, and the channel 30 is located in a middle of an end of the bent portion 22 away from the connecting portion 23. Since the channel 30 is disposed in the middle of the bent part 22, when the bent part 22 is connected to the terminal post 200 through the channel 30, the connection stability between the terminal post 200 and the bent part 22 can be effectively increased.

Specifically, referring to fig. 10 and 11, in some embodiments, the bending portion 22 includes at least a portion of at least two stacked folding pieces 21, each folding piece 21 is opened with a third through hole 31, and at least two third through holes 31 are stacked to form the channel 30. Because every folded member 21 has all seted up the third through hole 31 for utmost point post 200 wears to establish whole folding assembly 20, strengthens the stability of being connected between mass collector 100 and the utmost point post 200.

For example, referring to fig. 10 and 11, fig. 11 is an exploded view of the folding assembly 20, and fig. 10 is a view illustrating a plurality of folding members 21 stacked. The folding assembly 20 includes five folding pieces 21, each folding piece 21 includes a sub-bending portion 221 and a sub-connecting portion 231, and one end of the sub-bending portion 221 of each folding piece 21 away from the sub-connecting portion 231 is provided with a third through hole 31. When five folding members 21 are stacked to form the folding assembly 20, the plurality of sub-bent portions 221 are stacked to form the bent portion 22, and the plurality of third through holes 31 are stacked to form the passage 30.

Referring to fig. 9, in some embodiments, an end of the bending portion 22 away from the connecting portion 23 has two channels 30, the channels 30 are used for connecting the terminal post 200, at least a portion of the terminal post 200 is located in the channels 30, and the two channels 30 are disposed at intervals. This enables the current collector 100 to be simultaneously connected with the two poles 200, thereby enabling better stability of the connection between the current collector 100 and the battery 2000.

Specifically, in some embodiments, the bending portion 22 includes a first end 2203 and a second end 2204, the first end 2203 is an end of the bending portion 22 away from the connecting portion 23, the second end 2204 is close to the connecting portion 23 relative to the first end 2203, the first end 2203 has a width greater than that of the second end 2204, and the first end 2203 has two channels 30. On one hand, since the width of the first end 2203 is greater than that of the second end 2204, the normal overcurrent capacity of the current collector 100 can be ensured; on the other hand, since the two passages 30 are provided, the current collector 100 can be simultaneously connected with the two electrode posts 200, so that the stability of the connection between the current collector 100 and the battery 2000 can be made better.

Wherein, in some embodiments, the distance between the edges of two channels 30 is less than the width of the second end 2204. In this way, the edges of both passages 30 are made to comprise the structure of a partial current collector 100, ensuring the stability of the connection between the current collector 100 and the pole 200.

Referring to fig. 9, in some embodiments, the recess 40 includes a third recess 29, the bend 22 has at least one third recess 29, the at least one third recess 29 is located at an end side of the bend 22, the third recess 29 is located between the first end 2203 and the second end 2204, and the bend 22 can be bent along the third recess 29. This can facilitate folding of the folding assembly 20, i.e., folding of the current collector 100. In addition, the current collector 100 can be folded in a designated direction, and the current collector 100 can be prevented from being eccentric in the process of entering the shell when the battery 2000 is assembled subsequently.

The thickness of the plurality of folding members 21 in the folding assembly 20 may not be exactly the same. In some embodiments, the at least two folds 21 include a fifth fold 21 and a sixth fold 21, the thickness of the fifth fold 21 being less than the thickness of the sixth fold 21. Due to the different thickness of the folding member 21, the overall structural strength of the folding assembly 20 can be ensured, the folding assembly 20 can be bent conveniently, and the overcurrent capacity of the folding assembly 20 as a conductive piece can be ensured. In addition, the design conditions of other components (such as the lower plastic, the form of the tab or the structure of the post) of the battery 2000 can be correspondingly matched, so as to improve the space where the current collector 100 can be arranged.

In some embodiments, the number of the fifth folding members 21 is at least two, and at least two fifth folding members 21 are stacked. Therefore, the overall structural strength of the folding assembly 20 can be ensured, the problem that the folding piece 21 of the folding assembly 20 is broken in the vibration process, particularly in the vibration fatigue process, is avoided, the folding assembly 20 is convenient to bend, and meanwhile, the overcurrent capacity of the folding assembly 20 as a conductive piece is ensured. Also, it should be noted that, in the technical verification test, it is found that even if one or two of the fifth folds 21 are broken, the current collector 100 can achieve normal overcurrent as a conductive adaptor.

It should be noted that, when the number of the fifth folding members 21 is at least two, and at least two fifth folding members 21 are stacked, in some embodiments, the sixth folding member 21 is located at one side of at least two fifth folding members 21 in the stacked arrangement. Since the sixth folding member 21 with a relatively large thickness is disposed at one side of at least two fifth folding members 21, the overall structural strength of the folding assembly 20 can be ensured.

In some embodiments, the thickness of the fifth fold 21 is 5% to 95% of the thickness of the sixth fold 21. As such, the thickness of the fifth and

sixth folds

21 and 21 may be set according to a specific application environment. In addition, the configuration of the other components (such as the lower plastic, the tab form, or the post structure) of the battery 2000 may be adapted accordingly, so as to increase the space in which the current collector 100 can be disposed.

Further, in some embodiments, the thickness of the fifth fold 21 is 8% to 50% of the thickness of the sixth fold 21. Therefore, the overall structural strength of the folding assembly 20 can be ensured, the problem that the folding piece 21 of the folding assembly 20 is broken in the vibration process, particularly in the vibration fatigue process, is avoided, the folding assembly 20 is convenient to bend, and meanwhile the overcurrent capacity of the folding assembly 20 as a conductive piece is ensured. In addition, since the sixth folding member 21 has a relatively large thickness, the number of layers of the folding members 21 provided to the folding assembly 20 as a whole can be relatively small, so as to reduce the installation space occupied by the current collector 100 in the battery 2000 and reduce the manufacturing cost of the current collector 100. In addition, the folding assembly 20 is not prone to wrinkling when bent.

Of course, in some embodiments, the thickness of the fifth fold 21 is 45% to 95% of the thickness of the sixth fold 21. Therefore, the overall structural strength of the folding assembly 20 can be ensured, the problem that the folding piece 21 of the folding assembly 20 is broken in the vibration process, especially in the vibration fatigue process, is avoided, the folding assembly 20 is convenient to bend, and meanwhile, the overcurrent capacity of the folding assembly 20 as a conductive piece is ensured. In addition, the thicknesses of the fifth folding member 21 and the sixth folding member 21 are similar, so that the overall structure of the folding assembly 20 has good consistency and the overflowing is balanced. Moreover, each folding piece 21 can be arranged to be thinner, the whole flexibility is better, and the bending effect is better.

In some embodiments, the thickness of each fold 21 is in the range of [0.05mm,0.3mm ]. For example, the thickness of the flap 21 may be 0.05mm, 0.06mm, 0.08mm, 0.12mm, 0.16mm, 0.18mm, 0.23mm, 0.25mm, 0.28mm, 0.30mm, etc. Since the thickness of the folded member 21 is too thin, for example, the thickness of the folded member 21 is less than 0.05mm, the folded assembly 20 formed by laminating a plurality of folded members 21 under a certain number is still prone to fracture during vibration, especially during vibration fatigue; if the thickness of the folded member 21 is too thick, for example, the thickness of the folded member 21 is greater than 0.3mm, such that the folded member 21 is not easily folded, and the overall thickness of the current collector 100 is increased, which is not beneficial to reducing the volume and the mass of the battery 2000. Therefore, in the present embodiment, since the thickness of each of the folding pieces 21 is in the range of [0.05mm,0.3mm ], it is possible to solve not only the problem that the current collector 100 is easily broken when it is subjected to vibration fatigue, but also the normal folding of the current collector 100 is not affected.

Referring to fig. 1, in some embodiments, a side of the body 10 away from the current collector 100 has an avoiding notch 12, and the avoiding notch 12 penetrates through a part of the edge of the body 10. Because the edge of the body 10 is provided with the avoiding notch 12, the avoiding notch 12 can be used for avoiding the explosion-proof valve.

Referring to fig. 13, in some embodiments, the present application further provides an end cap assembly 1000 for a battery 2000. The end cap assembly 1000 includes a cap plate 300 and the current collector 100 described in any of the above embodiments, and the current collector 100 is connected to the cap plate 300.

In the end cap assembly 1000 of the present application, the foldable assembly 20 in the current collector 100 is provided as a multi-layer structure, which is beneficial to increase the rigidity of the foldable assembly 20 and reduce the possibility of fracture of the foldable assembly 20, so as to solve the problem that the current collector 100 is easy to fracture when in vibration fatigue, thereby prolonging the service life of the end cap assembly 1000.

Referring to fig. 13, in some embodiments, the present disclosure further provides a battery 2000. Battery 2000 includes naked electric core 400, shell 500 and the end cap assembly 1000 described in any of the above embodiments, and at least part of naked electric core 400 is held in shell 500, and end cap assembly 1000 is connected with naked electric core 400.

In the battery 2000 of the present application, the foldable assembly 20 in the current collector 100 is provided as a multi-layer structure, which is beneficial to increase the rigidity of the foldable assembly 20 and reduce the possibility of fracture of the foldable assembly 20, so as to solve the problem that the current collector 100 is easy to fracture when in vibration fatigue, thereby prolonging the service life of the battery 2000.

Referring to fig. 1 and 14, in some embodiments, the housing 500 is cylindrical, and defines a direction parallel to a center line of the cylinder as a first direction D1, and at least a portion of an orthogonal projection of the folded component 20 after being bent in the first direction D1 falls on the body 10. This is advantageous to prevent the eccentricity problem since at least a portion of the orthographic projection of the folded folding assembly 20 in the first direction D1 falls on the body 10.

In some embodiments, at least a portion of an orthographic projection of the folded assembly 20 in the first direction D1 falls on the bare cell 400. Because folding assembly 20 after buckling is on first direction D1 orthographic projection's at least part falls on naked electric core 400, so be favorable to the cooperation of mass flow collector 100 with naked electric core 400.

In some embodiments, the bare cell 400 includes a tab 401, the tab 401 is used to connect with the body 10, and at least a portion of an orthographic projection of the folded assembly 20 in the first direction D1 falls on the tab 401. Because the orthographic projection of the folded assembly 20 after bending in the first direction D1 is at least partially dropped on the tab 401, the matching of the current collector 100 and the bare cell 400 is facilitated.

Referring to fig. 15, in some embodiments, the present application further provides a battery pack 4000, where the battery pack 4000 includes a battery box 3000 and a battery 2000 as described in any of the above embodiments, and at least a portion of the battery 2000 is accommodated in the battery pack 4000.

In the battery pack 4000 of the present application, the foldable assembly 20 of the current collector 100 in the battery 2000 is provided as a multi-layer structure, which is beneficial to increase the rigidity of the foldable assembly 20 and reduce the possibility of breakage of the foldable assembly 20, so as to solve the problem that the current collector 100 is easy to break when in vibration fatigue, thereby prolonging the service life of the battery 2000.

In the description of the present specification, reference to the description of the terms "certain embodiments," "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present application, "a plurality" means at least two, e.g., two, three, unless specifically limited otherwise.

Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations of the above embodiments may be made by those of ordinary skill in the art within the scope of the present application, which is defined by the claims and their equivalents.

Claims

1. A current collector, comprising:

a body; and

the folding assembly comprises at least two stacked folding pieces, and at least one concave part is arranged on each folding piece.

2. The current collector of claim 1, wherein the folding assembly comprises a bent portion and a connecting portion, the bent portion is connected to the body through the connecting portion, and the bent portion is bendable relative to the connecting portion.

3. The current collector of claim 2, wherein at least a portion of the connection is fixedly connected to one side of the body.

4. The current collector of claim 2, wherein an orthographic projection of the bent portion on the body after bending covers at least a portion of the connection portion.

5. The current collector of claim 2, wherein an orthographic area of the bent portion on the body after bending is greater than an orthographic area of the connecting portion on the body.

6. The current collector of claim 2, wherein the thickness of the connection portion is greater than the thickness of the body.

7. The current collector of claim 2, wherein the recesses comprise first recesses, and a junction of the connecting portion and the bent portion has at least one first recess located at an end side of the junction.

8. The current collector of claim 7, wherein the number of the first recesses is two, and the two first recesses are located at two ends of the connection.

9. The current collector of claim 7, wherein the connection comprises at least a portion of at least two stacked folds, the first recess comprising at least one first sub-recess, at least one of the folds having the first sub-recess, the first sub-recess being located at an end side of the fold.

10. The current collector of claim 9, wherein the at least two folds comprise a first fold and a second fold, the first fold and the second fold being in a stacked arrangement, the first fold having the first sub-recess, the second fold having the first sub-recess, the first sub-recess of the first fold and the first sub-recess of the second fold being in a stacked arrangement.

11. The current collector of claim 9, wherein the number of the folded pieces is multiple, each folded piece has the first sub-recess, and the multiple first sub-recesses located on the same side of the connection are stacked.

12. The current collector of claim 9, wherein the first sub-recess is an arcuate slot.

13. The current collector of claim 7, wherein the connection comprises a first fold connecting the first recess, and wherein the bend is bendable along the first fold relative to the connection.

14. The current collector of claim 13, wherein the number of the first recesses is two, the two first recesses are located at two ends of the connection, the first crease connects the two first recesses, and the first crease is located between the two first recesses.

15. The current collector of claim 13, wherein the first fold comprises at least a portion of at least two stacked folds, the first fold comprising two or more first sub-folds, at least one of the folds having the first sub-folds, the two or more first sub-folds being stacked.

16. The current collector of claim 2, wherein the recesses comprise second recesses, and the bent portion has at least one of the second recesses at an end side of the bent portion.

17. The current collector of claim 16, wherein the number of the second recesses is two, and the two second recesses are located at end sides of the bent portion, respectively.

18. The current collector of claim 16, wherein at least two of the second recesses are spaced apart on the same side of the bent portion.

19. The current collector of claim 18, wherein two of the second recesses spaced along the same side of the bent portion have different shapes and/or sizes.

20. The current collector of claim 16, wherein the kink comprises a first end side and a second end side that are connected, the first end side having at least one of the second recess and the second end side having at least one of the second recess.

21. The current collector of claim 16, wherein the bent portion comprises at least part of at least two stacked folded pieces, and the second recess comprises at least one second sub-recess, and at least one of the folded pieces has at least one second sub-recess located at an end side of the folded piece.

22. The current collector of claim 21, wherein the at least two folds comprise a third fold and a fourth fold, the third fold and the fourth fold being stacked, the third fold having the second sub-recess, the fourth fold having the second sub-recess, the second sub-recess of the third fold and the second sub-recess of the fourth fold being stacked.

23. The current collector of claim 21, wherein the number of the folded pieces is multiple, each folded piece has the second sub-recess, and the second sub-recesses located on the same side of the bent portion are stacked.

24. The current collector of claim 21, wherein two ends of at least one of the folded pieces respectively have one of the second sub-recesses, and the two second sub-recesses of the folded piece are symmetrically arranged.

25. The current collector of claim 21, wherein the second sub-recess is an arcuate slot.

26. The current collector of claim 16, wherein the bend comprises a first bend, a second bend, and a second fold, the second fold being located between the first bend and the second bend, the second fold connecting the second recess, the first bend being capable of bending relative to the second bend along the second fold.

27. The current collector of claim 26, wherein the second fold is recessed relative to the first fold and the second fold is recessed relative to the second fold with the first and second folds in the flattened state.

28. The current collector of claim 26, wherein the second fold consists of portions of the at least two folds arranged in a stack, wherein the first fold comprises portions of the at least two folds arranged in a stack, and wherein the second fold comprises portions of the at least two folds arranged in a stack.

29. The current collector of claim 26, wherein the first fold after the second fold has a gap.

30. The current collector of claim 26, wherein the number of the second recesses is two, and two of the second recesses are located at two ends of the second fold respectively, and the second fold connects the two second recesses.

31. The current collector of claim 26, wherein the second fold comprises at least a portion of at least two stacked folds, the second fold comprising two or more second sub-folds, at least one of the folds having the second sub-folds, the two or more second sub-folds being stacked.

32. The current collector of claim 1, wherein, in the condition in which the folded assembly is folded, at least two adjacent folded pieces have a gap therebetween.

33. The current collector of claim 1, wherein a length of at least one of the folds is greater than a distance between any two points of the body.

34. The current collector of claim 1, wherein orthographic projections of two adjacent folded pieces on the body at least partially overlap.

35. The current collector of claim 1, wherein the body has at least one through hole therethrough.

36. The current collector of claim 35, wherein the at least one through-hole comprises at least one first through-hole, and wherein an orthographic projection of the folded assembly on the body covers at least a portion of the first through-hole with at least a portion of the folded assembly bent relative to the body.

37. The current collector of claim 35, wherein the at least one through-hole comprises at least one second through-hole, and wherein an orthographic projection of the folded assembly on the body has zero area covering the second through-hole under conditions in which at least part of the folded assembly is bent relative to the body.

38. The current collector of claim 37, wherein the at least one second via is located on the same side of the folded assembly after folding, with at least a portion of the folded assembly folded relative to the body.

39. The current collector of claim 37, wherein the number of the second through holes is two or more, at least two of the second through holes are spaced apart, and the spacing between the spaced apart second through holes is smaller than the width of the folded piece.

40. The current collector of claim 37, wherein the number of the second through holes is two or more, and any two of the second through holes are spaced apart.

41. The current collector of claim 37, wherein the number of the second through holes is two or more, and a connection line between the shortest distances of any two adjacent second through holes is located outside an orthographic projection of the folded assembly on the body after being bent.

42. The current collector of claim 37, wherein the number of the second through holes is two or more, and at least a portion of a connection line between the shortest distances of any two adjacent second through holes is covered by an orthographic projection of the folded assembly on the body after being folded.

43. The current collector of claim 37, wherein the second through hole is circular.

44. The current collector of claim 2, wherein the end of the bent portion away from the connecting portion has a passage, the passage is used for connecting a terminal, at least a portion of the terminal is located in the passage, and the passage is located in the middle of the end of the bent portion away from the connecting portion.

45. The current collector of claim 44, wherein the bent portion comprises at least a portion of at least two stacked folded pieces, each folded piece defining a third via, at least two of the third vias being stacked to form the passage.

46. The current collector of claim 2, wherein the end of the bent portion away from the connecting portion has two passages, the passages are used for connecting a terminal, at least a portion of the terminal is located in the passages, and the two passages are spaced apart from each other.

47. The current collector of claim 46, wherein the bent portion comprises a first end and a second end, the first end is an end of the bent portion away from the connection portion, the second end is close to the connection portion relative to the first end, the first end has a width greater than a width of the second end, and the first end has two of the passages.

48. The current collector of claim 47, wherein a distance between edges of two of the channels is less than a width of the second end.

49. The current collector of claim 47, wherein the recesses comprise a third recess, the bend has at least one third recess, the at least one third recess is located on an end side of the bend, the third recess is located between the first end and the second end, and the bend is bendable along the third recess.

50. The current collector of claim 1, wherein the at least two folds comprise a fifth fold and a sixth fold, the fifth fold having a thickness less than a thickness of the sixth fold.

51. The current collector of claim 50, wherein the number of fifth folds is at least two, and wherein the at least two fifth folds are arranged in a stack.

52. The current collector of claim 51, wherein the sixth fold is located on one side of the at least two fifth folds arranged in a stack.

53. The current collector of claim 50, wherein the thickness of the fifth fold is between 5% and 95% of the thickness of the sixth fold.

54. The current collector of claim 53, wherein the thickness of the fifth fold is between 8% and 50% of the thickness of the sixth fold.

55. The current collector of claim 53, wherein the thickness of the fifth fold is 45% to 95% of the thickness of the sixth fold.

56. The current collector of claim 1, wherein the thickness of each folded piece is in the range of [0.05mm,0.3mm ].

57. The current collector of claim 1, wherein a side of the body distal from the folding assembly has an avoidance gap extending through a portion of an edge of the body.

58. An end cap assembly for a battery, comprising:

a cover plate; and

the current collector of claims 1-57, the cap plate being connected to the current collector.

59. A battery, comprising: a naked battery cell;

an outer shell within which at least a portion of the bare cell is housed; and

the end cap assembly of claim 58, coupled to the bare cell.

60. The battery of claim 59, wherein the housing has a cylindrical shape, a first direction is defined as a direction parallel to a centerline of the cylinder, and at least a portion of an orthographic projection of the folded assembly in the first direction after being folded falls on the body.

61. The battery of claim 60, wherein at least a portion of an orthographic projection of the folded assembly in the first direction falls on the bare cell after folding.

62. The battery of claim 60, wherein the bare cell comprises a tab for connection with the body, and at least a portion of an orthographic projection of the folded assembly in the first direction after bending falls on the tab.

63. A battery pack, comprising:

a battery box; and

the battery of claim 59, at least a portion of the battery being housed within the battery pack.