WO2024017367A1

WO2024017367A1 - Current collector, battery and battery pack

Info

Publication number: WO2024017367A1
Application number: PCT/CN2023/108579
Authority: WO
Inventors: 徐卫东; 何波; 张男
Original assignee: 厦门海辰储能科技股份有限公司
Priority date: 2022-07-21
Filing date: 2023-07-21
Publication date: 2024-01-25
Also published as: CN218300152U

Abstract

A current collector (100), an end cover assembly (1000), a battery (2000), and a battery pack (4000). The current collector (100) comprises a body (10) and a folding assembly (20), wherein at least part of the folding assembly (20) can be bent relative to the body (10), the folding assembly (20) comprises at least two stacked folding members (21), and at least one recess (40) is provided on each folding member (21).

Description

Current collectors, batteries and battery packs

priority information

This application requests the priority and rights of the patent application with patent application number 202221913795.1, which was submitted to the State Intellectual Property Office of China on July 21, 2022, and its full text is incorporated herein by reference.

Technical field

The present application relates to the field of battery technology, and more specifically, to a current collector, a battery and a battery pack.

Background technique

With the development of society, the intensification of environmental pollution and the increasing depletion of traditional energy sources, people are becoming more and more aware of environmental protection. Lithium-ion batteries have become the first choice for green energy due to their high energy density, high voltage, low discharge rate, and long cycle life. Therefore, they are widely used in portable devices such as Bluetooth headsets, mobile phones, digital computers, and tablet computers, as well as in electric vehicles and storage. Energy power stations and other large equipment.

In comparison, when assembling the cover assembly of a cylindrical battery, the current collector needs to be folded. However, the folded part of the current collector is prone to breakage during vibration, especially vibration fatigue.

Contents of the invention

Embodiments of the present application provide a current collector, a battery and a battery pack.

The current collector in the embodiment of the present application includes a body and a folding component. At least part of the folding component can be bent relative to the body, the folding component includes at least two stacked folding parts, and at least one recess is provided on the folding part,

The folding component 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.

At least part of the connecting portion is fixedly connected to one side of the body.

In some embodiments, the orthogonal projected area of the bent portion on the body is greater than the orthogonal projected area of the connecting portion on the body.

In this way, the orthogonal projection area of the bent portion on the body is larger, ensuring the flow capacity of the current collector. In addition, the area of the orthogonal projection of the connection part on the body is relatively small, so that the area occupied by the body when welded to the body is smaller, thereby ensuring that the body has sufficient space reserved for welding the tabs, thereby ensuring the overflow of the current collector. ability.

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

In this way, the main part of the bent portion is located directly above the main body, which is beneficial to preventing eccentricity problems when the current collector is inserted into the shell.

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

In this way, the thickness of the connecting part is greater than the thickness of the body, which can ensure the structural strength of the connection between the connecting part and the body.

In some embodiments, the recess includes a first recess, the connection includes at least portions of at least two stacked folds, the first recess includes at least one first sub-recess, and at least one of the The folding piece has the first sub-recess, which is located on an end side of the folding piece. The connection part includes a first crease part connected to the first recessed part, and the bending part can be bent relative to the connection part along the first crease part. The first fold includes at least portions of at least two stacked folds, the first fold includes two or more first sub-folds, and at least one of the folds has the A first sub-fold portion, the two or more first sub-fold portions are stacked.

When the first recessed portion is used as a current collector for bending, such an arrangement makes the current collector folding more stable, makes the current collector less likely to be dislocated during bending, and increases the accuracy of the current collector bending.

In some embodiments, the recessed portion includes a second recessed portion, the bent portion has at least one second recessed portion, and the at least one second recessed portion is located on an end side of the bent portion. The bending part includes at least part of at least two stacked folding parts, the second recess includes at least one second sub-recess, at least one of the folding parts has at least one second sub-recess, The second sub-recess is located on the end side of the folding element.

In this way, the bending portion can be bent along the second concave portion, which is beneficial to the folding of the folding member, that is, the folding of the current collector. In addition, it can also ensure that the current collector is folded in the specified direction, and when it is subsequently assembled into a battery, it is helpful to prevent eccentricity problems when the current collector is inserted into the case. question. In addition, the second concave portion can also be used as a limiting portion. The current collector can cooperate with the limiting member of other components (such as the lower plastic) through the second concave portion to limit the position of the current collector. When the second recessed portion is used as a current collector for bending, this arrangement makes the folding of the current collector better, and makes the bent current collector less likely to wrinkle, which is beneficial to current collector flow diversion. When the second concave portion is used as a limiting portion, the second concave portion provided in this way can easily perform limiting fit with other components.

In some embodiments, at least two of the second recesses are spaced apart on the same side of the bending part, and the shape of the two second recesses spaced along the same side of the bending part and / Or the sizes are the same or different, or the bending part includes a connected first end side and a second end side, the first end side has at least one second recess, and the second end side has at least one said second recess.

In this way, when the second recess is used as a current collector for bending, such an arrangement makes the folding of the current collector better. The second recess can also be provided in different shapes or sizes and located at different ends according to the specific functions of the second recess. The second recess on the side can play different functional roles to avoid mutual interference.

In some embodiments, the bending part includes a first bending part, a second bending part and a second folding part, and the second folding part is located between the first bending part and the third folding part. Between the two bending parts, the second folding part is connected to the second recessed part, and the first bending part can be bent relative to the second bending part along the second folding part. When the first bending part and the second bending part are in a flattened state, the second folding part is concave relative to the first bending part, and the second folding part is concave relative to the first bending part. The second folded portion is concave, the second folded portion is composed of portions of the at least two folded pieces arranged in a stack, and the first bending portion includes the at least two folded pieces arranged in a stack. The second bending portion includes portions of the at least two folded pieces arranged in a stack. The number of the second recessed parts is two, and the two second recessed parts are respectively located at both ends of the second folded part, and the second folded part connects the two second recessed parts. The second fold portion includes two or more second sub-fold portions, at least one of the folding pieces has the second sub-fold portion, and the two or more second sub-fold portions are stacked set up.

In this way, the second fold portion is connected to the second concave portion, and when the first bend portion is bent relative to the second bend portion along the second fold portion, the stability of the folding of the current collector can be improved, and the current collector can also be bent. It’s not easy to dislocate. This is beneficial to the first bending part being bent relative to the second bending part along the second folding part, and is also beneficial to the first bending part being bent relative to the second bending part along the second folding part. The folded portion connects two second recessed portions, that is, both ends of the second folded portion have second recessed portions. In this way, compared with only one end of the second folded portion having the second recessed portion, the first bent portion is along the second recessed portion. When the crease portion is bent relative to the second bending portion, the stability of the current collector folding can be further improved, and the current collector can also be less likely to be dislocated when bent. At least one folding part has a second sub-folding part, and the second sub-folding parts on different folding parts are stacked, so that the first bending part is bent relative to the second bending part along the second folding part. When folding, it can improve the stability of the current collector folding, and also prevent the current collector from being misaligned when bending, making the current collector more accurate when bending.

In some embodiments, when the folding assembly is bent, there is a gap between at least two adjacent folding pieces.

In this way, a buffer space can be reserved for the folded part after bending, thereby avoiding the problem of breakage of the current collector during vibration, especially vibration fatigue, thereby extending the service life of the current collector.

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

In this way, a larger degree of bending can be performed, and the vibration-buffering effect of the current collector can be enhanced.

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

This is helpful to prevent eccentricity problems in the current collector during the process of entering the shell.

In certain embodiments, the body has at least one through hole extending therethrough. The at least one through hole includes at least one first through hole or at least one second through hole. Under the condition that at least part of the folding component is bent relative to the body, the folding component is formed on the body. The orthographic projection covers at least part of the first through hole. The area of the second through hole covered by the orthographic projection of the folding component on the body is zero.

In this way, opening at least one through hole on the body is beneficial to the circulation of electrolyte and/or is beneficial to reducing the local thickness of the body. The electrolyte in the battery can flow through the first through hole, which is beneficial to evenly distributing the electrolyte in the battery. Since the body is provided with a second through hole, this is beneficial to reducing the local thickness of the body, thereby reducing the quality of the current collector.

In some embodiments, when at least part of the folding component is bent relative to the body, the at least one second through hole is located on the same side of the bent folding component.

Since the body is provided with a second through hole, this is beneficial to reducing the local thickness of the body, thereby reducing the quality of the current collector.

In some embodiments, the number of the second through holes is two or more, at least two of the second through holes are spaced apart, and the distance between the two second through holes that are spaced apart is less than The width of the folded piece. Alternatively, any two second through holes are arranged at intervals. Alternatively, the connection line between the shortest distance of any two adjacent second through holes is located at the end of the bent folding component on the body. Outside the orthographic projection. Alternatively, at least part of the connection line between the shortest distances of any two adjacent second through holes is covered by the orthographic projection of the bent folding component on the body.

In some embodiments, the bent portion includes a first end and a second end, the first end is an end of the bent portion away from the connecting portion, and the second end is relative to the third end. One end is close to the connecting part, and the first end has a channel or two channels spaced apart from each other in the middle of the first end. The channel is configured to connect a pole, and at least part of the pole is located in the channel. Inside, the bent portion includes at least part of at least two stacked folding pieces, each of the folding pieces is provided with a third through hole, and at least two of the third through holes are stacked to form the channel. .

In this way, the channel is provided in the middle of the bending part. When the bending part is connected to the pole through the channel, the stability of the connection between the pole and the bending part can be effectively increased. Since each folding piece is provided with a third through hole, the pole passes through the entire folding assembly, thereby enhancing the stability of the connection between the current collector and the pole. In this way, the current collector can be connected to two poles at the same time, thereby making the connection between the current collector and the battery more stable. Due to the provision of two channels, the current collector can be connected to two poles at the same time, thereby making the connection between the current collector and the battery more stable.

In some embodiments, the width of the first end is greater than the width of the second end.

Since the width of the first end is greater than the width of the second end, the normal flow capacity of the current collector can be ensured.

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

In this way, the edges of both channels include part of the current collector structure, ensuring the stability of the connection between the current collector and the pole.

In some embodiments, the recessed portion includes a third recessed portion, the bent portion has at least one third recessed portion, and at least one third recessed portion is located at an end side of the bent portion, or the third recessed portion The recess is located between the first end and the second end, and the bending part can be bent along the third recess.

This can facilitate the folding of the folding component, that is, the folding of the current collector. In addition, it can also ensure that the current collector is folded in a specified direction, and when it is subsequently assembled into a battery, it is helpful to prevent eccentricity problems when the current collector is inserted into the case.

In some embodiments, the at least two folds have different thicknesses.

Due to the different thickness settings of the folding components, it is possible to ensure the overall structural strength of the folding component, facilitate the bending of the folding component, and at the same time ensure the overcurrent capability of the folding component as a conductive component. Moreover, this can be matched according to the design of other components of the battery (such as the lower plastic or the form of the tabs or the structure of the poles) to increase the space available for installing the current collector.

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

The thickness of each folded piece is within the range of [0.05mm, 0.3mm], which not only solves the problem of the current collector being easily broken during vibration fatigue, but also does not affect the normal folding of the current collector.

In some embodiments, the side of the body away from the folding assembly has an escape notch, and the escape notch penetrates part of the edge of the body.

Since there is an escape notch on the edge of the body, the escape notch can be used to avoid the explosion-proof valve.

The battery in the embodiment of the present application includes a bare cell, a casing and an end cover assembly. At least part of the bare cell is accommodated in the casing. The end cover assembly is connected to the bare cell. The end cover assembly includes The cover plate and the current collector according to any one of the above embodiments, the cover plate is connected to the current collector.

In the battery of the present application, by arranging the foldable folding components in the current collector into a multi-layer structure, it is beneficial to increase the rigidity of the folding components and reduce the possibility of fracture of the folding components, thereby solving the problem that the current collector is prone to vibration fatigue. breakage problem to extend battery life.

In some embodiments, the shell is in the shape of a cylinder, and a direction parallel to the center line of the cylinder is defined as the first direction, and the orthographic projection of the bent folding component in the first direction At least part of falls on the body of the current collector or the bare cell.

Since at least part of the orthographic projection of the bent folding component in the first direction falls on the body, this is helpful in preventing eccentricity problems. Since at least part of the orthographic projection of the folded component in the first direction falls on the bare battery core, this is beneficial to the cooperation between the current collector and the bare battery core.

The battery pack in the embodiment of the present application includes a battery box and the battery described in any of the above embodiments. At least part of the battery is contained in the battery box.

In the battery pack of the present application, by arranging the foldable folding components in the current collector of the battery into a multi-layer structure, it is beneficial to increase the Increase the rigidity of the folding components and reduce the possibility of breakage of the folding components, thus solving the problem that the current collector is prone to breakage during vibration fatigue and extending the service life of the battery.

Additional aspects and advantages of embodiments of the 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 application.

Description of drawings

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

Figure 1 is a schematic three-dimensional structural diagram of a current collector in certain embodiments of the present application;

Figure 2 is a three-dimensional exploded schematic diagram of a current collector in certain embodiments of the present application;

Figure 3 is a schematic three-dimensional structural diagram of the current collector after bending in certain embodiments of the present application;

Figure 4 is a schematic diagram of the orthographic projection of the bent portion and the connecting portion on the body after the current collector is bent in some embodiments of the present application;

Figure 5 is a schematic three-dimensional structural diagram of the folding member in the current collector in some embodiments of the present application;

Figure 6 is a three-dimensional exploded schematic view of the folding member in the current collector in some embodiments of the present application;

Figure 7 is a schematic three-dimensional structural diagram of the folding member in the current collector in some embodiments of the present application;

Figure 8 is a three-dimensional exploded schematic view of the folding member in the current collector in some embodiments of the present application;

Figures 9 and 10 are schematic three-dimensional structural diagrams of current collectors in certain embodiments of the present application;

Figure 11 is a three-dimensional exploded schematic diagram of a current collector in certain embodiments of the present application;

Figure 12 is a schematic three-dimensional structural diagram of the current collector and pole in certain embodiments of the present application;

Figure 13 is a schematic structural diagram of a battery in certain embodiments of the present application;

Figure 14 is a schematic three-dimensional structural diagram of a battery in certain embodiments of the present application;

Figure 15 is a schematic structural diagram of a battery pack in certain embodiments of the present application.

Description of main component symbols:

Current collector 100

Body 10, through hole 11, first through hole 111, second through hole 112, avoidance notch 12;

Folding assembly 20, folding piece 21, bending part 22, sub-bending part 221, first bending part 223, first sub-bending part 2231, second bending part 222, second sub-bending part 2221, One end side 2201, second end side 2202, first end 2203, second end 2204, connection part 23, sub-connection part 231, recessed part 40, first recessed part 25, first sub-recessed part 251, first crease part 26 , the first sub-fold part 261, the second recessed part 27, the second sub-recessed part 271, the second folded part 28, the second sub-folded part 281, the third recessed part 29, the channel 30, the third through hole 3;

End cover assembly 1000, cover plate 300;

2000 batteries, 200 poles, 400 bare cells, 401 tabs, and 500 shells.

Detailed ways

The embodiments of the present application will be further described below with reference to the accompanying drawings. The same or similar numbers throughout the drawings represent the same or similar elements or elements with the same or similar functions.

In addition, the embodiments of the present application described below in conjunction with the drawings are exemplary and are only used to explain the embodiments of the present application and cannot be understood as limiting the present application.

In this application, unless otherwise expressly stated and limited, a first feature "on" or "under" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. touch. Furthermore, the terms "above", "above" and "above" the first feature is above the second feature may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "below" and "beneath" the first feature to the second feature may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature has a smaller horizontal height than the second feature.

Please refer to FIG. 1 and FIG. 2 . An embodiment of the present application provides a current collector 100 . The current collector 100 includes a body 10 and a folding component 20 . At least part of the folding assembly 20 can be bent relative to the body 10 . The folding assembly 20 includes at least two stacked folding pieces 21 provided with at least one recess 40 . During the vibration process, especially when vibration fatigue occurs, the bent portion of the current collector 100 is prone to breakage. However, in the current collector 100 of the present application, the folding assembly 20 includes at least two folds stacked together. The component 21 is conducive to increasing the rigidity of the folding component 20 and reducing the possibility of breakage of the folding component 20, thus solving the problem that the current collector 100 is easily broken during vibration fatigue and extending the service life of the current collector 100.

Specifically, the folding assembly 20 includes a plurality of stacked folding pieces 21 . Wherein, multiple folding pieces 21 can be bonded together through adhesive to form the folding assembly 20 . As shown in FIG. 2 , the folding assembly 20 includes five folding pieces 21 . Five folding pieces 21 are stacked together to form the folding assembly 20 .

In some embodiments, the length of at least one folding member 21 is greater than the distance between any two points of the body 10 . In this way, the folding member 21 can be bent to a greater extent, and the vibration-absorbing function of the current collector 100 can be enhanced. For example, as shown in FIG. 2 , the folding assembly 20 includes five folding pieces 21 , and the lengths of the five folding pieces 21 are the same and 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 folding piece 21 is smaller than the width of the body 10 between two sides of the folding piece 21 . In this way, the normal flow capacity of the current collector 100 can be ensured, and the folding member 21 can be prevented from being too wide and causing interference during installation. As shown in FIG. 2 , the folding assembly 20 includes five folding pieces 21 , the widths of the five folding pieces 21 are the same and smaller than the width of the body 10 between two sides of the folding pieces 21 .

Please refer to Figures 1 and 2. In some embodiments, the folding component 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. The bending portion 22 can be bent relative to the connecting portion 23. . Specifically, each folding part 21 includes a sub-bending part 221 and a sub-connecting part 231. When multiple folding parts 21 are stacked to form the folding assembly 20, the multiple sub-bending parts 221 are stacked to form the bending part 22. The sub-connection parts 231 are stacked to form the connection part 23 . The bending part 22 is connected to the main body 10 through the connecting part 23 , and the bending part 22 can be bent relative to the connecting part 23 , so that the bending part 22 can be bent relative to the main body 10 . The connecting portion 23 can be welded to the main body 10 as a whole, so that the multi-layer folding component 20 and the main body 10 can be tightly connected to ensure the reliability of the connection between the multi-layer folding component 20 and the main body 10 .

Furthermore, in some embodiments, the thickness of the connecting portion 23 is greater than the thickness of the body 10 , so as to ensure the structural strength of the connection between the connecting portion 23 and the body 10 .

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

In some embodiments, at least part of the connecting portion 23 is fixedly connected to one side of the body 10 . At least part of the connecting portion 23 can be welded to the body 10 as a whole. In this way, the multi-layer folding component 20 and the main body 10 can be tightly connected, ensuring the reliability of the connection between the multi-layer folding component 20 and the main body 10 .

For example, please refer to FIGS. 1 and 2 . In some embodiments, the folding component 20 includes a folding part a1 , a folding part a2 , a folding part a3 , a folding part a4 and a folding part a5 . Among them, the folding piece a2 is stacked on the folding piece a1, the folding piece a3 is stacked on the folding piece a2, the folding piece a4 is stacked on the folding piece a3, the folding piece a5 is stacked on the folding piece a4, and the folding piece a1 sub-connection portion 231 One end away from the sub-bending portion 221 is connected to the body 10 . In this way, at least part of the connecting portion 23 can be fixedly connected to one side of the body 10 .

It should be noted that in the embodiment shown in Figure 2, the folding part a1 can be connected to the body 10 first, and then the folding part a2 can be stacked on the folding part a1, and the folding part a3 can be stacked on the folding part a2. The folded piece a4 is laminated on the folded piece a3 and the folded piece a5 is laminated on the folded piece a4 to form the current collector 100 . Of course, the five folding parts 21 can also be assembled into the folding assembly 20 first and then connected to the main body 10 , which is not limited here.

Please refer to FIG. 3 , which shows the state of the folding component 20 after being bent relative to the body 10 . In some embodiments, the orthographic projection of the bent portion 22 on the body 10 covers at least part of the connecting portion 23 .

Please refer to FIGS. 3 and 4 again. In some embodiments, the orthogonal projected area of the bent portion 22 on the body 10 is larger than the orthogonal projected area of the connecting portion 23 on the body 10 . FIG. 4 is a schematic diagram of the projection of the bending part 22 and the connecting part 23 on the body 10 after the bending part 22 is bent. Among them, S1 in Figure 4 represents the orthographic projection of the bent portion 22 on the body 10, and S2 in Figure 4 represents the orthographic projection of the connecting portion 23 on the body 10. It can be seen that the bent portion The area of the orthographic projection S1 of 22 on the body 10 is larger than the area of the orthographic projection S2 of the connecting portion 23 on the body 10 . On the one hand, since the area of the bent portion 22 after bending is larger, the flow capacity of the current collector 100 can be ensured, and the current collector 100 can have a larger heat dissipation area, which is conducive to heat dissipation; on the other hand, because the connecting portion The area of 23 is relatively small, so that when it is welded to the body 10, it occupies a smaller area of the body 10 to ensure that the body 10 has sufficient space reserved for welding the tabs, thereby ensuring the current flow capacity of the current collector 100.

Furthermore, in some embodiments, at least part of the orthographic projection of the bent portion 22 on the body 10 overlaps with the orthographic projection of the connecting portion 23 on the body 10 . That is, the main part of the bent portion 22 is located directly above the body 10 , which is helpful to prevent the current collector 100 from eccentricity during the process of being inserted into the shell.

Furthermore, in some embodiments, the orthographic projections of two adjacent bent folding parts 21 on the body 10 at least partially overlap. In particular, in some embodiments, the orthographic projections of two adjacent bent folding members 21 on the body 10 completely overlap, which is helpful to prevent eccentricity problems of the current collector 100 during the process of inserting the current collector 100 into the housing.

Please refer to Figure 5. In some embodiments, the recessed portion 40 includes a first recessed portion 25. The connection between the connecting portion 23 and the bending portion 22 has at least one first recessed portion 25. The at least one first recessed portion 25 is located on the end side of the connection. . By way of example, the connection includes two opposite end sides, and at least one of the two end sides is provided with the first recess 25 . Since there is at least one first recess 25 at the connection between the connecting part 23 and the bending part 22, the bending part 22 can be bent along the first recess 25 relative to the connecting part 23, which is beneficial to the folding of the folding assembly 20, that is, there is Facilitating folding of the current collector 100 . In addition, it can also ensure that the current collector 100 is folded in a specified direction, and when it is subsequently assembled into the battery 2000, it is helpful to prevent eccentricity problems of the current collector 100 during the process of being inserted into the case.

In some embodiments, the first concave portion 25 can also be used as a limiting portion. For example, in one example, the current collector 100 can cooperate with the first recess 25 and the limiting member of other components (such as lower plastic) to limit the position of the current collector 100 . This can reduce the complexity of assembling the battery 2000.

Further, please refer to FIG. 5 . In some embodiments, the number of the first recessed portions 25 is two, and the two first recessed portions 25 are respectively located at both ends of the connection between the bending portion 22 and the connecting portion 23 . When the first recessed portion 25 is bent and used as the current collector 100, since the two first recessed portions 25 are respectively located at both ends of the connection between the bent portion 22 and the connecting portion 23, the bent portion 22 can be located along the bending portion 22 and the connecting portion 23. The two first recesses 25 at both ends of the connecting portion 23 are bent relative to the connecting portion 23 , which facilitates the bending of the folding assembly 20 , thereby improving the folding stability of the current collector 100 . When the first recessed portion 25 is used as a limiting portion, since the two first recessed portions 25 are respectively located at both ends of the connection, it can provide a better stable positioning effect on the entire current collector 100 .

5 and 6 , the connection includes at least part of at least two stacked folding parts 21 , the first recess 25 includes at least one first sub-recess 251 , and at least one folding part 21 has the first sub-recess 251 . The sub-recess 251 is located on the end side of the folding piece 21 . When the first recess 25 is bent and used as the current collector 100, since the connection includes at least part of at least two stacked folding parts 21, the first recess 25 includes at least one first sub-recess 251, and the at least one folding part 21 The end side has a first sub-recess 251, which can make the folding of the current collector 100 more stable, and can also make the bent current collector 100 less likely to wrinkle, which is beneficial to the current collector 100 for flow guidance. When the first recess 25 is used as a limiting part, since the connection includes at least part of at least two stacked folding parts 21 , the first recess 25 includes at least one first sub-recess 251 , and the end side of at least one folding part 21 The first sub-recessed portion 251 is provided, thereby reducing the difficulty of limited fit between the first recessed portion 25 and other components.

For example, in some embodiments, at least two folding parts 21 include a first folding part 21 and a second folding part 21 , the first folding part 21 and the second folding part 21 are stacked, and the first folding part 21 has a first sub-folding part 21 . The second folding part 21 has a first sub-recess 251, and the first sub-recess 251 of the first folding part 21 and the first sub-recess 251 of the second folding part 21 are stacked. Since when the first folding part 21 and the second folding part 21 are stacked, the first sub-recess 251 of the first folding part 21 and the first sub-recess 251 of the second folding part 21 are stacked, so that in the first recess 25 When the current collector 100 is bent and used, the folding stability of the current collector 100 can be improved and the current collector 100 can be ensured to have a better flow guiding effect; when the first recessed portion 25 is used as a limiting portion, the stacked third recess 25 can be used as a limiting portion. A sub-recessed part 251 can improve the stability of the first recessed part 25 and the limiting parts of other components (such as lower plastic) when they are limited and matched.

For another example, please refer to FIG. 6 . In some embodiments, the number of folding parts 21 is multiple. Each folding part 21 has a first sub-recess 251 , and the plurality of first sub-recesses 251 located on the same side of the connection are stacked. set up. When multiple folding members 21 are stacked, multiple first sub-recesses 251 located on the same side of different folding members 21 are stacked. In this way, when the first recess 25 is bent and used as the current collector 100, the current collector 100 can be bent. The folding stability is better, and the current collector 100 can be ensured to have a better flow guiding effect; when the first concave portion 25 is used as a limiting portion, it can reduce the difficulty of the first concave portion 25 and other components in limiting the fit. Furthermore, the structural stability of the first recess 25 and other components is improved.

Specifically, as shown in FIG. 5 and FIG. 6 , FIG. 6 is an exploded schematic view of the folding assembly 20 , and FIG. 5 is a schematic view of a plurality of folding parts 21 stacked. The folding assembly 20 includes a folding piece a1, a folding piece a2, a folding piece a3, a folding piece a4 and a folding piece a5. The folding parts a1, a2, a3, a4 and a5 all include a sub-bending part 221 and a sub-connecting part 231, and the sub-bending part 221 and the sub-connecting part 231 of each folding part 21 are Both ends of the connection point have a first sub-recessed part b1 and a second sub-recessed part b2 respectively. When the folding piece a1, the folding piece a2, the folding piece a3, the folding piece a4 and the folding piece a5 are stacked, the folding piece a1, the folding piece a2, the folding piece a5 The first sub-recessed portion b1 on one side of the connection between the sub-bending portion 221 and the sub-connecting portion 231 of the piece a3, the folding piece a4 and the folding piece a5 is stacked to form the first recess B1; located in the folding piece a1, the folding piece a2 The first sub-recessed part b2 on the other side of the connection between the sub-bending part 221 and the sub-connecting part 231 of the folding part a3, the folding part a4 and the folding part a5 is stacked to form the first recessed part B2. The first recessed portion B1 and the first recessed portion B2 are located at both ends of the connection.

In some embodiments, the first sub-recess 251 may be an arc-shaped groove. In this way, when the first recessed portion 25 is bent and used as the current collector 100, the folding stability of the current collector 100 can be improved, and the current collector 100 can be prevented from interfering with itself or other components when folded; in the first recessed portion When 25 is used as a limiting portion, it can reduce the difficulty of the first recessed portion 25 and other components for limiting the fit, and can also improve the structural stability of the first recessed portion 25 and other components.

Please refer to Figure 5. In some embodiments, the connection includes a first fold portion 26, the first fold portion 26 is connected to the first recess 25, and the bending portion 22 can be relative to the connection portion 23 along the first fold portion 26. Bend. Since the first fold portion 26 is connected to the first recessed portion 25 , when the bending portion 22 is bent along the first fold portion 26 relative to the connecting portion 23 , the folding stability of the current collector 100 can be improved, and the current collector 100 can also be folded. Not easy to dislocate when bending.

Specifically, the number of the first recessed parts 25 is two. The two first recessed parts 25 are located at both ends of the connection. The first folded part 26 connects the two first recessed parts 25 and the first folded part 26 is located at both ends. between the first recesses 25 . Since the first folded portion 26 is located between the two first recessed portions 25 , that is, both ends of the first folded portion 26 have the first recessed portions 25 , so compared with only one end of the first folded portion 26 having the first recessed portion 25 . A recessed portion 25, when the bent portion 22 is bent relative to the connecting portion 23 along the first crease portion 26, can further improve the folding stability of the current collector 100, and also prevent the current collector 100 from being easily dislocated when bent.

Please refer to Figures 5 and 6. In some embodiments, the first fold portion 26 includes at least part of at least two stacked folding pieces 21, and the first fold portion 26 includes two or more first sub-folds. portion 261, at least one folding member 21 has a first sub-fold portion 261, and two or more first sub-fold portions 261 are stacked. Since at least one folding part 21 has the first sub-folding part 261 and the first sub-folding parts 261 on different folding parts 21 are stacked, the bending part 22 is connected relative to the first folding part 26 along the first folding part 26 . When the portion 23 is bent, the folding stability of the current collector 100 can be improved, and the current collector 100 can also be less easily dislocated when bent, so that the current collector 100 can be bent with higher accuracy.

For example, as shown in FIGS. 5 and 6 , FIG. 6 is an exploded schematic view of the folding assembly 20 , and FIG. 5 is a schematic view of a plurality of folding parts 21 stacked. The folding assembly 20 includes a folding piece a1, a folding piece a2, a folding piece a3, a folding piece a4 and a folding piece a5. The folding parts a1, a2, a3, a4 and a5 all include a sub-bending part 221 and a sub-connecting part 231, and the connection between the sub-bending part 221 and the sub-connecting part 231 of each folding part 21 There are first sub-recessed portions 251 at both ends of the folding piece 21 , and each folding piece 21 has a first sub-fold portion 261 connecting the two first sub-recessed portions 251 . When the folded parts a1, a2, a3, a4 and a5 are stacked, the first sub-fold portion located at the folded parts a1, a2, a3, a4 and a5 261 are stacked to form the first crease portion 26 .

Referring to FIG. 5 , in some embodiments, the recessed portion 40 includes a second recessed portion 27 , the bent portion 22 has at least one second recessed portion 27 , and the at least one second recessed portion 27 is located at an end side of the bent portion 22 . In some embodiments, the bending portion 22 can be bent along the second concave portion 27 , which facilitates the folding of the folding assembly 20 , that is, the folding of the current collector 100 . In addition, it can also ensure that the current collector 100 is folded in a specified direction, and when it is subsequently assembled into the battery 2000, it is helpful to prevent eccentricity problems of the current collector 100 during the process of being inserted into the case.

In some embodiments, the second concave portion 27 can also be used as a limiting portion. For example, in one example, the current collector 100 can cooperate with the second recess 27 and the limiting member of other components (such as the lower plastic) to limit the position of the current collector 100 . This can reduce the complexity of assembling the battery 2000.

Specifically, please refer to FIG. 5 . In some embodiments, the number of the second recessed portions 27 is two, and the two second recessed portions 27 are respectively located on the end sides of the bending portion 22 . When the second recessed portion 27 is bent and used as the current collector 100 , since the two second recessed portions 27 are respectively located on the end sides of the bent portion 22 , the bent portion 22 can follow the two second recessed portions 27 located at both ends of the bent portion 22 . The bending facilitates the bending of the folding component 20 , thereby improving the folding stability of the current collector 100 . When the second recessed portion 27 is used as a limiting portion, the two second recessed portions 27 located at both ends of the bent portion 22 can provide a better stable positioning effect on the entire current collector 100 .

It should be noted that in some embodiments, the bent portion 22 may have both a second recessed portion 27 used for bending the current collector 100 and a second recessed portion 27 used as a limiting portion. That is, the bending portion 22 includes at least two second concave portions 27 , and a part of the second concave portion 27 is used as the second concave portion 27 for bending the current collector 100 , and the bending portion 22 can be bent along this part of the second concave portion 27 . The other part of the second concave part 27 is used as a limiting part, and this part of the second concave part 27 can cooperate with the limiting parts of other components to limit the position of the current collector 100 .

In some embodiments, the specific functions of the second recessed portions 27 provided on the same side of the bent portion 22 may be different. For example, please Referring to FIG. 5 , in some embodiments, at least two second recesses 27 are spaced apart on the same side of the bending portion 22 . Specifically, in some examples, one or two or more second recesses 27 can be used as bending parts of the current collector 100 , and the remaining one or two or more second recesses 27 can be used as limiting parts. It is used to define the position of the bent current collector 100 by cooperating with the second recess 27 and the limiting members of other components.

For example, as shown in FIG. 5 , the bent portion 22 includes three second recessed portions 27 , which are respectively the second recessed portion C1 , the second recessed portion C2 and the second recessed portion C3 . The second recessed portion C1 and the second recessed portion C2 are spaced apart on one side of the bent portion 22 , the second recessed portion C3 is provided on the other side of the bent portion 22 , and the second recessed portion C2 corresponds to the second recessed portion C3 . The second concave portion C1 is used as a limiting portion, and the position of the bent current collector 100 is limited by the second concave portion C1 cooperating with the limiting members of other components. The second concave portion C2 and the second concave portion C3 are used for bending the current collector 100. The bending portion 22 can be bent along the second concave portion C2 and the second concave portion C3, which is beneficial to the bending of the folding assembly 20, so that the current collector 100 can be bent. Better folding stability.

Further, in some embodiments, the two second recesses 27 spaced apart along the same side of the bending portion 22 have different shapes and/or sizes. Since the two second recesses 27 spaced apart on the same side have different shapes and/or sizes, even if the two second recesses 27 with different functions are provided on the same side of the bending portion 22, the second recesses 27 can be easily adjusted according to the shape and/or size of the second recesses 27. The shape and/or size of the second recess 27 differentiates the two second recesses 27 with different specific functions. For example, when the corresponding second concave portion 27 is used as a limiting portion, the size of the second concave portion 27 can be set relatively small; when the corresponding second concave portion 27 is used as the current collector 100 in a bent manner, the size of the second concave portion 27 can be set relatively small. The size can be set relatively large.

In some embodiments, the second concave portions 27 with different specific functions can also be provided on different sides of the bending portion 22 . For example, please refer to Figure 7. In some embodiments, the bent portion 22 includes a connected first end side 2201 and a second end side 2202. The first end side 2201 has at least one second recess 27, and the second end side 2201 has at least one second recess 27. 2202 has at least one second recess 27 . In this way, the second recesses 27 located on different end sides can play different functions to avoid mutual interference.

For example, as shown in FIG. 7 , the bending portion 22 includes two second concave portions 27 , which are the second concave portion C1 and the second concave portion C2 respectively. The second recessed portion C1 is located at the first end side 2201 of the bent portion 22 and is used for bending the current collector 100; the second recessed portion C2 is located at the second end side 2202 of the bent portion 22 and is used as a limiting portion. That is, the bending portion 22 can be bent along the second concave portion C1, and the position of the bent current collector 100 is limited by the second concave portion C2 and the limiting member of other components.

Please refer to FIGS. 5 and 8 . In some embodiments, the bending portion 22 includes at least parts of at least two stacked folding parts 21 , the second recess 27 includes at least one second sub-recess 271 , and the at least one folding part 21 has At least one second sub-recess 271 is located on the end side of the folding part 21 . When the second recess 27 is used as the current collector 100 in a bent manner, since the second recess 27 includes at least one second sub-recess 271 and at least one folding member 21 has at least one second sub-recess 271 , the current collector 100 can be folded. The stability of the current collector 100 is better, and the bent current collector 100 is not easy to wrinkle, which is conducive to the flow conduction of the current collector 100. When the second recessed portion 27 is used as a limiting portion, since the second recessed portion 27 includes at least one second sub-recessed portion 271 and at least one folding member 21 has at least one second sub-recessed portion 271, the second recessed portion 27 and other recessed portions can be reduced. Difficulty of limited fit of components.

In some embodiments, the at least two folding parts 21 include a third folding part 21 and a fourth folding part 21 , the third folding part 21 and the fourth folding part 21 are stacked, and the third folding part 21 has a second sub-recess 271 , the fourth folding part 21 has a second sub-recess 271, and the second sub-recess 271 of the third folding part 21 and the second sub-recess 271 of the fourth folding part 21 are stacked. Since when the third folding part 21 and the fourth folding part 21 are stacked, the second sub-recess 271 of the third folding part 21 and the second sub-recess 271 of the fourth folding part 21 are stacked, in this way, in the second recess 27 When the current collector 100 is bent and used, 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 concave portion 27 is used as a limiting portion, the stacking The second sub-recessed portion 271 provided can improve the stability of the second recessed portion 27 and the limiting member of other components (such as the lower plastic) when engaging in limiting engagement.

Please refer to FIG. 5 and FIG. 8 . In some embodiments, the number of folding parts 21 is multiple. Each folding part 21 has a second sub-recess 271 , and the plurality of second sub-recesses are located on the same side of the bending part 22 . 271 cascade settings. When multiple folding members 21 are stacked, multiple second sub-recesses 271 located on the same side of different folding members 21 are stacked. In this way, when the second recess 27 is bent and used as the current collector 100, the current collector 100 can be bent. The folding stability is better and can ensure that the current collector 100 has a better flow guiding effect; when the second concave portion 27 is used as a limiting portion, it can reduce the difficulty of the second concave portion 27 and other components in limiting the fit. Furthermore, the structural stability of the second recessed portion 27 and other components is improved.

Specifically, as shown in FIG. 5 and FIG. 8 , FIG. 8 is an exploded schematic view of the folding assembly 20 , and FIG. 5 is a schematic view of a plurality of folding parts 21 stacked. The folding assembly 20 includes a folding piece a1, a folding piece a2, a folding piece a3, a folding piece a4 and a folding piece a5. The folding parts a1, a2, a3, a4 and a5 all include a sub-bending part 221 and a sub-connecting part 231, and the sub-bending part 221 of each folding part 21 includes a second sub-recessed part. c1, the second sub-recessed part c2 and the second sub-recessed part c3. For each folded piece 21, p. The second sub-recessed part c1 and the second sub-recessed part c2 are provided on the same side of the folding part 21, the second recessed part C3 is located on the other side of the folding part 21, and the second recessed part C3 corresponds to the second sub-recessed part c2. When the folding parts a1 , a2 , a3 , a4 and a5 are stacked, the sub-bending parts 221 of the plurality of folding parts 21 are stacked to form the bending part 22 . The second sub-recesses c1 of the folding parts a1, a2, a3, a4 and a5 are stacked to form the second recess C1; the folding parts a1, a2, a3, a4 and The second sub-recessed portions 271 of the folding piece a5 are stacked d2 to form the second recessed portion C2; the second sub-recessed portions 271 of the folding piece a1, the folding piece a2, the folding piece a3, the folding piece a4 and the folding piece a5 are stacked d3 to form the second recessed portion C2. 2. Concave C3. When the second recessed portion C2 and the second recessed portion C3 are bent and used as the current collector 100, that is, the bent portion 22 can be bent along the second recessed portion C2 and the second recessed portion C3, and the second recessed portion C1 is used as a limiting portion. The position of the bent current collector 100 is limited by cooperating with the second concave portion C1 and the limiting member of other components.

In some embodiments, at least one folding member 21 has a second sub-recess 271 at both ends, and the two second sub-recesses 271 of the folding member 21 are symmetrically arranged. In this way, when the second recess 27 is used as the current collector 100 for bending, it is helpful for the folding assembly 20 to bend, thereby making the folding stability of the current collector 100 better.

Likewise, in some embodiments, the second sub-recess 271 may be an arc-shaped groove. In this way, when the second recessed portion 27 is bent and used as the current collector 100, the folding stability of the current collector 100 can be improved, and the current collector 100 can be prevented from interfering with itself or other components when folded; in the second recessed portion When 27 is used as a limiting portion, it can reduce the difficulty of the limiting fit between the second concave portion 27 and other components, and can also improve the structural stability of the fit between the second concave portion 27 and other components.

Please refer to FIG. 5 . In some embodiments, the bending part 22 includes a first bending part 223 , a second bending part 222 and a second folding part 28 . The second folding part 28 is located on the first bending part 223 Between the second folding portion 222 and the second folding portion 28, the second recessed portion 27 is connected. The first bending portion 223 can be bent along the second folding portion 28 relative to the second bending portion 222. Since the second fold portion 28 is connected to the second recessed portion 27, when the first bend portion 223 is bent along the second fold portion 28 relative to the second bend portion 222, the folding stability of the current collector 100 can be improved, and the folding stability of the current collector 100 can be improved. This can prevent the current collector 100 from being easily dislocated when it is bent.

Specifically, in some embodiments, the number of the second recessed portions 27 is two. The two second recessed portions 27 are respectively located at both ends of the second folded portion 28 . The second folded portion 28 connects the two second recessed portions 27 . Since the second folded portion 28 connects the two second recessed portions 27 , that is, both ends of the second folded portion 28 have the second recessed portion 27 , so compared with only one end of the second folded portion 28 having the second recessed portion 27 , when the first bending portion 223 is bent relative to the second bending portion 222 along the second fold portion 28, the stability of the folding of the current collector 100 can be further improved, and the current collector 100 can also be less likely to be dislocated when bent. .

Please refer to FIG. 8 . In some embodiments, the second fold portion 28 is composed of at least two folded parts 21 arranged in a stack, and the first bending part 223 includes at least two folded parts 21 arranged in a stack. The second bending portion 222 includes portions of at least two folding pieces 21 arranged in a stack. This facilitates the first bending portion 223 to be bent relative to the second bending portion 222 along the second fold portion 28 .

Specifically, in some embodiments, the second fold portion 28 includes at least portions of at least two stacked folding pieces 21 , the second fold portion 28 includes two or more second sub-fold portions 281 , and at least one The folding piece 21 has a second sub-fold portion 281, and two or more second sub-fold portions 281 are stacked. Since at least one folding part 21 has a second sub-folding part 281 and the second sub-folding parts 281 on different folding parts 21 are stacked, the first bending part 223 faces each other along the second folding part 28 When the second bending portion 222 is bent, the folding stability of the current collector 100 can be improved, and the current collector 100 can also be less likely to be dislocated when bent, so that the current collector 100 can be bent with higher accuracy.

For example, as shown in FIG. 5 and FIG. 8 , FIG. 8 is an exploded schematic view of the folding assembly 20 , and FIG. 5 is a schematic view of a plurality of folding parts 21 stacked. The folding assembly 20 includes five folding parts 21. Each folding part 21 includes a first sub-bending part 2231, a second sub-bending part 2221 and a second sub-folding part 281, wherein the second sub-folding part 281 is located at the third sub-folding part 2231. Between the first sub-bending portion 2231 and the second sub-bending portion 2221 , the first sub-bending portion 2231 can be bent relative to the second sub-bending portion 2221 along the second sub-folding 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 folding portion 28 .

Please refer to FIG. 5 . In some embodiments, when the first bending part 223 and the second bending part 222 are in a flattened state, the second folding part 28 is concave relative to the first bending part 223 . The second crease portion 28 is concave relative to the second bending portion 222 . This facilitates the first bending portion 223 to be bent relative to the second bending portion 222 along the second fold portion 28 .

It should be noted that in some embodiments, the first bending portion 223 after being bent along the second folding portion 28 has a gap. Since the first bending portion 223 after being bent along the second folding portion 28 has a gap, a buffer space can be reserved for the bent folding member 21 , thereby avoiding vibration fatigue of the current collector 100 during the vibration process. , the problem of breakage occurs, thereby prolonging the service life of the current collector 100 .

In addition, in some embodiments, when the folding assembly 20 is bent, there may also be a gap between at least two adjacent folding parts 21 . This can also reserve a buffer space for the folded member 21 after bending, thereby preventing the current collector 100 from vibrating, especially When vibration fatigue occurs, the problem of fracture occurs, thereby extending the service life of the current collector 100 .

Referring to FIGS. 1 and 9 , in some embodiments, the body 10 has at least one through hole 11 penetrating the body 10 . Since at least one through hole 11 is opened in the body 10, it is beneficial to the circulation of the electrolyte and/or to reduce the local thickness of the body 10.

For example, please refer to FIGS. 1 and 9 . In some embodiments, at least one through hole 11 includes at least one first through hole 111 . When at least part of the folding component 20 is bent relative to the body 10 (please refer to FIG. 3), the orthographic projection of the folding component 20 on the body 10 covers at least part of the first through hole 111 . The electrolyte in the battery 2000 can flow through the first through hole 111 , which is beneficial to evenly distributing the electrolyte in the battery 2000 .

The above "under the condition that at least part of the folding component 20 is bent relative 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 orthographic projection of the bent folding assembly 20 on the body 10 covers at least the first through hole 111. part. That is, the above-mentioned "under the condition that at least part of the folding assembly 20 is bent relative to the body 10" can be understood as the structural condition of the current collector 100 when it is installed in the battery 2000 and used as a conductive member.

For another example, please refer to FIG. 9 . In some embodiments, at least one through hole 11 may also include at least one second through hole 112 . Under the condition that at least part of the folding component 20 is bent relative to the body 10 , the folding component 20 The area covered by the orthographic projection of the second through hole 112 on the body 10 is zero. That is, under the condition that at least part of the folding component 20 is bent relative to the body 10 , the orthographic projection of the folding component 20 on the body 10 cannot cover the second through hole 112 .

The above "under the condition that at least part of the folding component 20 is bent relative 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 orthographic projection of the bent folding assembly 20 on the body 10 covers the area of the second through hole 112. is zero. That is, the above-mentioned "under the condition that at least part of the folding assembly 20 is bent relative to the body 10" can be understood as the state after the current collector 100 is installed in the battery 2000.

It should be noted that the features of the bent folding assembly 20 described in this application can be understood as features that the current collector 100 can have after being installed in the battery 2000 . Therefore, no further details will be given on this.

On the one hand, since the body 10 is provided with the second through hole 112 , this is beneficial to reducing the local thickness of the body 10 , thereby reducing the quality of the current collector 100 ; on the other hand, since at least part of the folding assembly 20 is bent relative to the body 10 Under the folded condition, the area of the second through hole 112 covered by the orthographic projection of the folded component 20 on the body 10 is zero, and the electrolyte in the battery 2000 cannot flow through the second through hole 112, thereby avoiding affecting the normal operation of the battery 2000.

In some embodiments, when at least part of the folding component 20 is bent relative to the body 10 , at least one second through hole 112 is located on the same side of the bent folding component 20 . Since the body 10 is provided with the second through hole 112 , this is beneficial to reducing the local thickness of the body 10 , thereby reducing the quality of the current collector 100 .

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

For example, in some embodiments, the number of the second through holes 112 is two or more, and the distance between at least two spaced apart 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 the connecting line between the shortest distance of any two adjacent second through holes 112 is located on the bent folding assembly. 20 is outside the orthographic projection 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 part of the connection line between the shortest distance of any two adjacent second through holes 112 is formed by bending the folded Orthographic overlay of component 20 on body 10 .

It should be noted that in some embodiments, the second through hole 112 is circular, which is convenient for processing. Of course, in some embodiments, the second through hole 112 can also be in other shapes, such as triangle, rectangle, rhombus, hexagon, etc., which are not limited here.

Please refer to Figure 10. In some embodiments, one end of the bent portion 22 away from the connecting portion 23 has a channel 30. The channel 30 is configured to connect the pole 200 (as shown in Figure 12). At least part of the pole 200 is located In the channel 30 , the channel 30 is located in the middle of the end of the bent portion 22 away from the connecting portion 23 . Since the channel 30 is disposed in the middle of the bent portion 22 , when the bent portion 22 is connected to the pole 200 through the channel 30 , the stability of the connection between the pole 200 and the bent portion 22 can be effectively increased.

Specifically, please refer to Figures 10 and 11. In some embodiments, the bending portion 22 includes at least part of at least two stacked folding parts 21, each folding part 21 is provided with a third through hole 31, and at least two The third through holes 31 are stacked to form the channel 30 . Since each folding member 21 is provided with a third through hole 31 , the pole 200 passes through the entire folding assembly 20 , thereby enhancing the stability of the connection between the current collector 100 and the pole 200 .

For example, please refer to FIG. 10 and FIG. 11 . FIG. 11 is an exploded schematic view of the folding assembly 20 , and FIG. 10 is a schematic view of multiple folding parts 21 stacked. picture. The folding assembly 20 includes five folding parts 21. Each folding part 21 includes a sub-bending part 221 and a sub-connecting part 231, and the end of the sub-bending part 221 of each folding part 21 away from the sub-connecting part 231 is provided with a third Tee hole 31. When five folding pieces 21 are stacked to form the folding assembly 20 , a plurality of sub-bending portions 221 are stacked to form the bending portion 22 , and a plurality of third through holes 31 are stacked to form the channel 30 .

Please refer to Figure 9. In some embodiments, one end of the bent portion 22 away from the connecting portion 23 has two channels 30. The channels 30 are configured to connect the poles 200. At least part of the poles 200 is located in the channels 30. Two channels 30 are provided. Channel 30 interval setting. In this way, the current collector 100 can be connected to the two poles 200 at the same time, thereby making the connection between the current collector 100 and the battery 2000 more stable.

Specifically, in some embodiments, the bent portion 22 includes a first end 2203 and a second end 2204. The first end 2203 is the end of the bent portion 22 away from the connecting portion 23, and the second end 2204 is relative to the first end 2203. Close to the connecting portion 23 , the width of the first end 2203 is greater than the width of the second end 2204 , and the first end 2203 has two channels 30 . On the one hand, since the width of the first end 2203 is greater than the width of the second end 2204, this can ensure the normal flow capacity of the current collector 100; on the other hand, because the two channels 30 are provided, the current collector 100 can be connected to two channels at the same time. The poles 200 are connected, thereby making the connection between the current collector 100 and the battery 2000 more stable.

Wherein, in some embodiments, the distance between the edges of the two channels 30 is less than the width of the second end 2204 . In this way, the edges of the two channels 30 both include part of the structure of the 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 recessed portion 40 includes a third recessed portion 29 , the bent portion 22 has at least one third recessed portion 29 , and the at least one third recessed portion 29 is located at an end side of the bent portion 22 , and the third recessed portion 29 Located between the first end 2203 and the second end 2204 , the bending portion 22 can be bent along the third recess 29 . This can facilitate the folding of the folding component 20 , that is, the folding of the current collector 100 . In addition, it can also ensure that the current collector 100 is folded in a specified direction, and when it is subsequently assembled into the battery 2000, it is helpful to prevent eccentricity problems of the current collector 100 during the process of being inserted into the case.

The thicknesses of the plurality of folding pieces 21 in the folding assembly 20 may not be exactly the same. In some embodiments, the at least two folding parts 21 include a fifth folding part 21 and a sixth folding part 21 , and the thickness of the fifth folding part 21 is smaller than the thickness of the sixth folding part 21 . Due to the different thickness settings of the folding component 21, the overall structural strength of the folding component 20 can be ensured, the bending of the folding component 20 can be facilitated, and the overcurrent capability of the folding component 20 as a conductive component can be ensured. Moreover, this can be matched according to the design of other components of the battery 2000 (such as the lower plastic or the form of the tabs or the structure of the pole), so as to increase the installation space of the current collector 100.

In some embodiments, the number of fifth folding parts 21 is at least two, and at least two fifth folding parts 21 are arranged in a stack. In this way, the overall structural strength of the folding assembly 20 can be ensured, and the folding member 21 of the folding assembly 20 can be prevented from breaking during the vibration process, especially when vibration fatigue occurs, and the bending of the folding assembly 20 can be facilitated while ensuring that the folding assembly 20 20 as the overcurrent capacity of conductive parts. Moreover, it should be noted that in technical verification tests, it was found that even if one or both of the fifth folded parts 21 break, the current collector 100 as a conductive adapter can still achieve normal overcurrent.

It should be noted that when the number of the fifth folding parts 21 is at least two and the at least two fifth folding parts 21 are stacked, in some embodiments, the sixth folding part 21 is located on the at least two stacked parts. Five folds 21 on one side. Since the thicker sixth folding member 21 is provided on 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 folding part 21 is 5% to 95% of the thickness of the sixth folding part 21 . In this way, the thickness of the fifth folding part 21 and the sixth folding part 21 can be set according to the specific application environment. Moreover, this can be matched according to the design of other components of the battery 2000 (such as the lower plastic or the form of the tabs or the structure of the pole), so as to increase the installation space of the current collector 100.

Further, in some embodiments, the thickness of the fifth folding part 21 is 8% to 50% of the thickness of the sixth folding part 21 . In this way, the overall structural strength of the folding assembly 20 can be ensured, and the folding member 21 of the folding assembly 20 can be prevented from breaking during vibration, especially vibration fatigue, and it can also facilitate the bending of the folding assembly 20 while ensuring that The folded component 20 serves as a conductive component for overcurrent capability. In addition, since the thickness of the sixth folding member 21 is relatively thick, the number of layers of the folding members 21 installed in the folding assembly 20 can be relatively small, thereby reducing the installation space occupied by the current collector 100 in the battery 2000 and reducing the current collector 100 manufacturing costs. In addition, the folding component 20 is less likely to wrinkle when bent.

Of course, in some embodiments, the thickness of the fifth folding part 21 is 45% to 95% of the thickness of the sixth folding part 21 . In this way, the overall structural strength of the folding assembly 20 can be ensured, and the folding member 21 of the folding assembly 20 can be prevented from breaking during the vibration process, especially during vibration fatigue, and it can also facilitate the bending of the folding assembly 20 and ensure the folding at the same time. Component 20 serves as a conductive component for overcurrent capability. In addition, the thickness of the fifth folding member 21 and the sixth folding member 21 is similar, the overall structure of the folding assembly 20 is more consistent, and the flow is more balanced. Moreover, each folding member 21 can be configured to be thinner, with better overall flexibility and better overall bending effect.

In some embodiments, the thickness of each fold 21 is in the range [0.05mm, 0.3mm]. For example, the thickness of the folding member 21 may be 0.05mm, 0.06mm, 0.08mm, 0.12mm, 0.16mm, 0.18mm, 0.23mm, 0.25mm, 0.28mm, 0.30mm, etc. Depend on If the thickness of the folding part 21 is too thin, for example, the thickness of the folding part 21 is less than 0.05 mm, then the folding assembly 20 formed by stacking a certain number of folding parts 21 together will suffer from vibration during vibration, especially vibration fatigue. It is still easy to break; if the thickness of the folding part 21 is too thick, for example, the thickness of the folding part 21 is greater than 0.3mm, it will not be easy to fold the folding part 21, and it will also increase the overall thickness of the current collector 100, which is not conducive to reducing the battery 2000. Volume and mass. Therefore, in this embodiment, since the thickness of each folded member 21 is within the range of [0.05mm, 0.3mm], this not only solves the problem that the current collector 100 is easily broken during vibration fatigue, but also does not affect the strength of the current collector 100 Fold normally.

Referring to FIG. 1 , in some embodiments, the body 10 has an escape notch 12 on the side away from the current collector 100 , and the escape notch 12 penetrates part of the edge of the body 10 . Since the avoidance notch 12 is provided on the edge of the body 10, the avoidance notch 12 can be used to avoid the explosion-proof valve.

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

In the end cap assembly 1000 of the present application, by configuring the foldable folding assembly 20 in the current collector 100 into a multi-layer structure, it is beneficial to increase the rigidity of the folding assembly 20 and reduce the possibility of the folding assembly 20 breaking, thus solving the problem. The current collector 100 is easily broken due to vibration fatigue, so as to extend the service life of the end cap assembly 1000 .

Referring to Figure 13, in some embodiments, the embodiment of the present application further provides a battery 2000. The battery 2000 includes a bare cell 400, a casing 500, and the end cover assembly 1000 described in any of the above embodiments. At least part of the bare cell 400 is accommodated in the casing 500, and the end cover assembly 1000 is connected to the bare cell 400.

In the battery 2000 of the present application, by configuring the foldable folding component 20 in the current collector 100 into a multi-layer structure, it is beneficial to increase the rigidity of the folding component 20 and reduce the possibility of breakage of the folding component 20, thus solving the current collector problem. 100 is prone to breakage during vibration fatigue in order to extend the service life of the battery 2000.

Please refer to FIG. 1 and FIG. 14 . In some embodiments, the housing 500 is in the shape of a cylinder. The direction parallel to the center line of the cylinder is defined as the first direction D1 . The bent folding component 20 is in the first direction D1 At least part of the orthographic projection falls on the body 10 . Since at least part of the orthographic projection of the bent folding component 20 in the first direction D1 falls on the body 10 , this is helpful in preventing eccentricity problems.

In some embodiments, at least part of the orthographic projection of the folded component 20 in the first direction D1 falls on the bare cell 400 . Since at least part of the orthographic projection of the bent folding component 20 in the first direction D1 falls on the bare battery core 400 , this is beneficial to the cooperation between the current collector 100 and the bare battery core 400 .

In some embodiments, the bare battery core 400 includes tabs 401 , the tabs 401 are configured to be connected to the body 10 , and at least part of the orthographic projection of the bent folding component 20 in the first direction D1 falls on the tabs 401 superior. Since at least part of the orthographic projection of the bent folding component 20 in the first direction D1 falls on the tab 401 , this is beneficial to the cooperation between the current collector 100 and the bare battery core 400 .

Please refer to Figure 15. In some embodiments, the embodiment of the present application also provides a battery pack 4000. The battery pack 4000 includes a battery box 3000 and the battery 2000 described in any of the above embodiments. At least part of the battery 2000 contains in the battery box 3000.

In the battery pack 4000 of the present application, by arranging the foldable folding component 20 of the current collector 100 in the battery 2000 into a multi-layer structure, it is beneficial to increase the rigidity of the folding component 20 and reduce the possibility of breakage of the folding component 20. This solves the problem that the current collector 100 is easily broken during vibration fatigue, thereby extending the service life of the battery 2000.

In the description of this specification, reference is made to the terms "certain embodiments," "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples." By description it is meant 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 application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

In addition, the terms “first” and “second” are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Thus, features defined as "first" and "second" may explicitly or implicitly include at least one of the described features. In the description of this application, "plurality" means at least two, such as two or three, unless otherwise expressly and specifically limited.

Although the embodiments of the present application have been shown and described above, it can be understood that the above-mentioned embodiments are illustrative and cannot be understood as limitations of the present application. Those of ordinary skill in the art can make modifications to the above-mentioned embodiments within the scope of the present application. The embodiments are subject to changes, modifications, substitutions and variations, and the scope of the application is defined by the claims and their equivalents.

Claims

A current collector consisting of:

body; and

a folding assembly, at least part of which can be bent relative to the body; the folding assembly includes at least two stacked folding parts; at least one recess is provided on the folding part;

The folding assembly includes a bending portion and a connecting portion. The bending portion is connected to the body through the connecting portion. The bending portion can be bent relative to the connecting portion. At least part of the connecting portion is fixed. Connected to one side of the body.
The current collector according to claim 1, wherein the orthographic projection of the bent portion on the body covers at least part of the connecting portion.
According to the current collector according to claim 1 or 2, the orthogonal projected area of the bent portion on the body is larger than the orthogonal projected area of the connecting portion on the body.
According to the current collector according to any one of claims 1 to 3, the thickness of the connecting part is greater than the thickness of the body.
The current collector according to any one of claims 1-4, the recessed portion includes a first recessed portion,

The connection includes at least part of at least two stacked folding parts, the first recess includes at least one first sub-recess, at least one of the folding parts has the first sub-recess, the first sub-recess The recess is located on the end side of the folded piece,

The connection includes a first crease portion connected to the first recessed portion, and the bending portion can be bent along the first crease portion relative to the connection portion,

The first fold includes at least portions of at least two stacked folds, the first fold includes two or more first sub-folds, and at least one of the folds has the A first sub-fold portion, the two or more first sub-fold portions are stacked.
The current collector according to any one of claims 1 to 5, the recessed portion includes a second recessed portion, the bent portion has at least one second recessed portion, and at least one second recessed portion is located in the bent portion. end side;

The bending part includes at least part of at least two stacked folding parts, the second recess includes at least one second sub-recess, at least one of the folding parts has at least one second sub-recess, The second sub-recess is located on the end side of the folding element.
The current collector according to claim 6, wherein

At least two of the second recesses are spaced apart on the same side of the bending part, and the shapes and/or sizes of the two second recesses spaced along the same side of the bending part are the same or different; or,

The bent portion includes a connected first end side and a second end side, the first end side has at least one second recess, and the second end side has at least one second recess.
The current collector according to claim 6, the bending part includes a first bending part, a second bending part and a second folding part, the second folding part is located between the first bending part and the second folding part. Between the second bending parts, the second folding part is connected to the second recessed part, and the first bending part can be bent relative to the second bending part along the second folding part. fold;

When the first bending part and the second bending part are in a flat state, the second folding part is concave relative to the first bending part, and the second folding part is opposite to the first bending part. The second bending portion is concave;

The second fold portion is composed of portions of the at least two folded pieces arranged in a stack, the first bending portion includes portions of the at least two folded pieces arranged in a stack, and the second bend portion The folding portion includes portions of the at least two folding pieces arranged in a stack;

The number of the second recessed parts is two, and the two second recessed parts are respectively located at both ends of the second folded part, and the second folded part connects the two second recessed parts;

The second fold portion includes two or more second sub-fold portions, at least one of the folding pieces has the second sub-fold portion, and the two or more second sub-fold portions are stacked set up.
According to the current collector according to any one of claims 1 to 8, under the condition that the folding assembly is bent, there is a gap between at least two adjacent folding parts.
According to the current collector according to any one of claims 1 to 9, the length of at least one of the folded parts is greater than the distance between any two points of the body.
According to the current collector according to any one of claims 1 to 10, the orthographic projections of two adjacent bent folding parts on the body at least partially overlap.
The current collector according to any one of claims 1 to 11, the body having at least one through hole penetrating the body;

The at least one through hole includes at least one first through hole or at least one second through hole. Under the condition that at least part of the folding component is bent relative to the body, the folding component is formed on the body. The orthographic projection covers at least part of the first through hole,

The area of the second through hole covered by the orthographic projection of the folding component on the body is zero.
The current collector according to claim 12, wherein the at least one second through hole is located on the same side of the folded component after at least part of the folded component is bent relative to the body.
The current collector according to claim 13, 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 distance between the two second through holes that are spaced apart is smaller than the width of the folding member;

Or, any two second through holes are arranged at intervals;

Alternatively, the connecting line between the shortest distances of any two adjacent second through holes is located outside the orthographic projection of the bent folding component on the body;

Alternatively, at least part of the connection line between the shortest distances of any two adjacent second through holes is covered by the orthographic projection of the bent folding component on the body.
The current collector according to claim 1, the bent portion includes a first end and a second end, the first end is an end of the bent portion away from the connecting portion, and the second end is relative to The first end is close to the connecting portion, the first end has a channel located in the middle of the first end or two channels spaced apart, the channel is configured to connect a pole, at least part of the pole is located Within the channel,

The bent portion includes at least part of at least two stacked folding pieces, each of the folding pieces is provided with a third through hole, and at least two of the third through holes are stacked to form the channel.
The current collector according to claim 15, the width of the first end is greater than the width of the second end.
According to the current collector of claim 15, the distance between the edges of the two channels is smaller than the width of the second end.
The current collector according to claim 15, the recessed portion includes a third recessed portion, and the bent portion has at least one third recessed portion,

At least one third recess is located on an end side of the bent portion, or

The third recessed portion is located between the first end and the second end, and the bending portion can be bent along the third recessed portion.
The current collector of claim 1, wherein the at least two folded members have different thicknesses.
According to the current collector according to any one of claims 1 to 19, the thickness of each folded member is within the range of [0.05mm, 0.3mm].
According to the current collector of claim 1, the side of the main body away from the folding assembly has an escape notch, and the escape notch penetrates part of the edge of the main body.
A battery including:

Bare cells;

a casing in which at least part of the bare battery core is accommodated; and

End cover assembly, the end cover assembly is connected to the bare cell, and the end cover assembly includes:

cover; and

The current collector according to any one of claims 1 to 21, wherein the cover plate is connected to the current collector.
The battery according to claim 22, wherein the casing is in the shape of a cylinder, a direction parallel to the center line of the cylinder is defined as a first direction, and the bent folding component is in the first direction. At least part of the orthographic projection falls on the body of the current collector or the bare cell.
A battery pack including:

battery box; and

The battery according to claim 22 or 23, at least part of the battery is accommodated in the battery box.