CN218299828U

CN218299828U - Current collector, end cover assembly, battery and battery pack

Info

Publication number: CN218299828U
Application number: CN202221914305.XU
Authority: CN
Inventors: 徐卫东; 何波; 张男
Original assignee: Xiamen Hithium Energy Storage Technology Co Ltd
Current assignee: Xiamen Hithium Energy Storage Technology Co Ltd
Priority date: 2022-07-21
Filing date: 2022-07-21
Publication date: 2023-01-13
Anticipated expiration: 2032-07-21

Abstract

The application discloses mass flow body, end cover subassembly, battery and battery package. The current collector comprises a current collecting disc, a bending assembly and a tightening structure. The bending assembly comprises at least two stacked bending pieces, the bending assembly can be bent relative to the current collecting disc, the bending assembly comprises a first connecting portion, a second connecting portion and a third connecting portion which are sequentially connected, the first connecting portion is connected with the current collecting disc, and the first connecting portion and the third connecting portion can be bent relative to the second connecting portion. The tightening structure is arranged on the bending component and is used for preventing or reducing the displacement between the bending pieces. This application sets up the subassembly of buckling through in the mass flow body into multilayer structure, so is favorable to avoiding the mass flow body fracture when vibration fatigue. In addition, because the tightening structure is arranged on the bending component to prevent or reduce the displacement between the bending pieces, the plurality of bending pieces in the bending component can be prevented from scattering.

Description

Current collector, end cover assembly, battery and battery pack

Technical Field

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

Background

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

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

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a mass flow body, end cover subassembly and battery.

The current collector in the embodiment of the application comprises a current collecting disc, a bending assembly and a tightening structure. The assembly of buckling includes two at least range upon range of pieces of buckling, the assembly of buckling can be relative the current collector dish is buckled, the assembly of buckling includes consecutive first connecting portion, second connecting portion and third connecting portion, first connecting portion with the current collector dish is connected, first connecting portion reach the third connecting portion all can be relative the second connecting portion are buckled. The tightening structure is arranged on the bending component and is used for preventing or reducing the displacement between the bending parts.

The mass flow body in this application sets up to multilayer structure through the subassembly of will buckling, so is favorable to increasing the rigidity of the subassembly of buckling, reduces the cracked possibility of subassembly of buckling to solve the mass flow body and easily cracked problem when vibration is tired, with the life of extension mass flow body. In addition, the tightening structure is arranged on the bending component to prevent or reduce the displacement between the bending pieces, so that the plurality of bending pieces in the bending component can be prevented from scattering.

In some embodiments, the second connecting portion defines the mounting hole, and the tightening structure includes at least one mounting post, and the mounting post is disposed through the mounting hole.

The mounting hole has been seted up to the second connecting portion, and the mounting hole is worn to locate by the erection column, so can be fixed more firm with the multilayer subassembly of buckling to prevent or reduce the displacement between the piece of buckling, thereby can prevent a plurality of pieces of buckling in the subassembly of buckling from scattering.

In some embodiments, the bending member has a through hole, the through holes of the bending members are communicated to form the mounting hole, the bending member includes a first side and a second side opposite to each other, and the mounting post includes a penetrating portion and a fixing portion connected to the penetrating portion. The penetrating part sequentially penetrates through the through holes along the direction from the first side to the second side; and the fixing portion may be exposed from the first side.

The mounting column penetrates through the through holes, so that the bending pieces can be fixedly connected, and the stacked bending pieces in the bending assembly are prevented from scattering

In some embodiments, the through-hole is in interference fit with the side wall of the mounting hole.

So can make a plurality of bending parts in the subassembly of buckling connect more firmly, be favorable to avoiding a plurality of range upon range of bending parts to scatter.

In certain embodiments, the current collecting disc is adapted to be coupled to a tab, and at least a portion of the mounting post is welded to the second coupling portion.

The current collecting disc is used for being connected with the pole lugs, at least part of the mounting column is welded with the second connecting portion, the multilayer bending assembly can be fixed more stably, and the bending assembly is beneficial to orderly bending.

In some embodiments, a cross-sectional area of the fixing portion is larger than a cross-sectional area of the mounting hole in a direction perpendicular to an extending direction of the penetrating portion.

So can avoid the fixed part also to stretch into to the mounting hole in, keep the fixed part throughout and can follow first side and expose, the user of being convenient for takes off the erection column from the subassembly of buckling to with increase and decrease and change the piece of buckling in the subassembly of buckling.

In some embodiments, the tightening structure further comprises at least one fixing member, which is wound around the second connecting portion.

This prevents or reduces displacement between the bending pieces, and thus prevents scattering of the plurality of stacked bending pieces in the bending assembly.

In some embodiments, a portion of the second connection portion is covered by the fixing member.

So not only can be with the multilayer subassembly of buckling fixed more firm, still be favorable to the subassembly of buckling to buckle in order to buckle.

In some embodiments, the first connecting portion is bent relative to the second connecting portion to form a first fold, the third connecting portion is bent relative to the second connecting portion to form a second fold, and at least one end of the first fold has a groove; and/or at least one end of the second fold has a groove.

The folding of the folding assembly is facilitated by the fact that at least one end of the first fold has a recess and/or at least one end of the second fold has a recess. In addition, can also guarantee that the mass flow body is folded according to the assigned direction to when the follow-up battery of assembling, be favorable to preventing the mass flow body and appear eccentric problem at the in-process of income shell.

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

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

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

End cover subassembly sets up to multilayer structure through the subassembly of buckling in the mass flow body in this application, so is favorable to increasing the rigidity of the subassembly of buckling, reduces the cracked possibility of the subassembly of buckling to solve the mass flow body and be fragile problem when vibration is tired, with the life who prolongs the mass flow body. In addition, the tightening structure is arranged on the bending component to prevent or reduce the displacement between the bending pieces, so that the plurality of bending pieces in the bending component can be prevented from scattering.

The battery in this application embodiment includes naked electric core and the end cover assembly in the above-mentioned embodiment, the end cover assembly with naked electric core is connected.

Battery in this application sets up the subassembly of buckling through the subassembly of will affluxing in into multilayer structure, so is favorable to increasing the rigidity of the subassembly of buckling, reduces the cracked possibility of the subassembly of buckling to solve the problem of affluxing the body easy fracture when vibration is tired, with the life who prolongs the afflux body. In addition, because the tightening structure is arranged on the bending component to prevent or reduce the displacement between the bending pieces, the plurality of bending pieces in the bending component can be prevented from scattering.

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

Battery package in this application sets up the bending component in the mass flow body through with in the battery into multilayer structure, so is favorable to increasing the rigidity of bending component, reduces the cracked possibility of bending component to solve the mass flow body and easily cracked problem when vibration is tired, with the life of extension mass flow body. In addition, because the tightening structure is arranged on the bending component to prevent or reduce the displacement between the bending pieces, the plurality of bending pieces in the bending component can be prevented from scattering.

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

Drawings

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

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

fig. 2 and 3 are schematic exploded perspective views of current collectors according to certain embodiments of the present disclosure;

fig. 4 is a schematic perspective view of a current collector according to certain embodiments of the present application;

fig. 5 is a schematic perspective exploded view of a current collector in certain embodiments of the present application;

fig. 6 is a schematic perspective view of a bent piece in a current collector according to some embodiments of the present disclosure;

FIG. 7 is a schematic diagram of a cell structure according to certain embodiments of the present application;

fig. 8 is a schematic diagram of a battery pack according to some embodiments of the present disclosure.

Description of the main element symbols:

current collector 100

Collecting plate 10, avoiding gap 11 and avoiding hole 12

The bending member 20, the first side 201, the second side 202, the bending member 21, the first sub-connecting portion 211, the second sub-connecting portion 212, the third sub-connecting portion 213, the through hole 2311, the positioning notch 214, the first connecting portion 22, the second connecting portion 23, the mounting hole 231, the third connecting portion 24, the first fold 25, the second fold 26, the groove 27, the tightening structure 30, the mounting post 31, the penetrating portion 311, the fixing portion 312, the fixing member 32, the first bending member 2101, the second bending member 2102, the third bending member 2103, the fourth bending member 2104, the fifth bending member 2105, the first side 215 of the bending member, the second side 216 of the bending member, the third side 217 of the bending member, the second side of the bending member, the third side of the bending member,

End cover assembly 1000 and cover body 300

Battery 2000, naked electric core 400

Battery pack 4000 and battery box 3000

Detailed Description

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

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

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

Referring to fig. 1 and 3, a current collector 100 is provided in accordance with an embodiment of the present disclosure. The current collector 100 includes a current collecting plate 10, a bending assembly 20, and a tightening structure 30. The bending assembly 20 comprises at least two stacked bending members 21. The bending assembly 20 can be bent relative to the current collecting plate 10, the bending assembly 20 includes a first connecting portion 22, a second connecting portion 23 and a third connecting portion 24 which are connected in sequence, the first connecting portion 22 is connected with the current collecting plate 10, and both the first connecting portion 22 and the third connecting portion 24 can be bent relative to the second connecting portion 23. A clinch structure 30 is provided to the bending element 20 and serves to prevent or reduce displacement between the bending elements 21.

It can be understood that the current collecting plate 10 may be used to connect with the tab of the bare cell 400 (shown in fig. 7), so that current conduction can be performed between the current collecting plate 10 and the tab of the bare cell 400. The third connection portion 24 may be used to connect with a pole of the battery 2000 to enable conduction of current between the third connection portion 24 and the pole of the battery 2000. The terminal of the battery 2000 may be a conductive member disposed on the end cap side of the battery 2000.

The current collector 100 is prone to fracture at the bends during vibration, especially during vibration fatigue. However, since in the current collector 100 of the present application, the bent assembly 20 includes at least two bent pieces 21 stacked together, it is beneficial to increase the rigidity of the bent assembly 20 and reduce the possibility of fracture of the bent assembly 20, so as to solve the problem that the current collector 100 is prone to fracture when subjected to vibration fatigue, thereby prolonging the service life of the current collector 100. In addition, since the present application further provides the fastening structure 30 to the bending member 20 to prevent or reduce the displacement between the bending members 21, the scattering of the plurality of bending members 21 in the bending member 20 can be prevented.

Specifically, the bending assembly 20 includes a plurality of stacked bending pieces 21. As shown in fig. 3, the bending assembly 20 includes five bending members 21. Five bending members 21 are laminated together to form the bending assembly 20. In some embodiments, the thickness of each bending member 21 may be in the range of [0.05mm,0.3mm ]. For example, the thickness of the bending piece 21 may be 0.05mm, 0.06mm, 0.08mm, 0.12mm, 0.16mm, 0.18mm, 0.23mm, 0.25mm, 0.28mm, 0.30mm, or the like.

Since the thickness of the bending member 21 is too thin, for example, the thickness of the bending member 21 is less than 0.05mm, the bending assembly 20 formed by laminating a plurality of bending members 21 under a certain number is still prone to fracture during vibration, especially during vibration fatigue; if the thickness of the bending member 21 is too thick, for example, the thickness of the bending member 21 is greater than 0.3mm, such that the bending member 21 is not easily folded, and the overall thickness of the current collector 100 is also increased, which is not beneficial to reducing the volume and the mass of the battery 2000. Therefore, in the present embodiment, since the thickness of each bending piece 21 is in the range of [0.05mm,0.3mm ], it is possible to solve not only the problem that the current collector 100 is easily broken when the current collector is subjected to vibration fatigue, but also the normal folding of the current collector 100 is not affected.

The bending assembly 20 includes a first connecting portion 22, a second connecting portion 23, and a third connecting portion 24, which are adjacent to each other, and the first connecting portion 22 is connected to the current collecting plate 10. The first connecting portion 22 is bendable relative to the second connecting portion 23, and the third connecting portion 24 is bendable relative to the second connecting portion 23. It should be noted that, referring to fig. 3, each bending element 21 in the bending assembly 20 includes a first sub-connection portion 211, a second sub-connection portion 212, and a third sub-connection portion 213, and the first sub-connection portion 211, the second sub-connection portion 212, and the third sub-connection portion 213 of each bending element 21 respectively correspond to the first connection portion 22, the second connection portion 23, and the third connection portion 24 of the bending assembly 20, that is, the first sub-connection portions 211 of the bending elements 21 are stacked to form the first connection portion 22 of the bending assembly 20; the second sub-connecting portions 212 of the plurality of bending pieces 21 are stacked to form the second connecting portion 23 of the bending assembly 20; the third sub-connecting portions 213 of the plurality of bent pieces 21 are stacked to form the third connecting portion 23 of the bent assembly 20.

The bending assembly 20 is configured to be bendable, i.e., the bending assembly 20 has an unfolded state and a folded state. Wherein, when the current collector 100 is not assembled into the end cap assembly 1000 (as shown in fig. 7), the bent assembly 20 is in an unfolded state; when the current collector 100 is assembled into the end cap assembly 1000, the bending assembly 20 is in a folded state, that is, the bending assembly 20 is bent with respect to the current collecting plate 10.

Illustratively, when the bending element 20 is in the unfolded state, the first connecting portion 22, the second connecting portion 23 and the third connecting portion 24 are sequentially arranged along the extending direction of the bending element 20; when the bending assembly 20 is in the folded state, the first connecting portion 22 and the third connecting portion 24 are respectively bent relative to the second connecting portion 23, and the three portions are in the folded state, and the first connecting portion 22 and the third connecting portion 24 are respectively located on two opposite sides of the second connecting portion 23.

A tightening mechanism 30 is provided on the bending member 20 and is used to prevent or reduce displacement between the bending members 21. Specifically, in some embodiments, a tightening structure 30 is provided at the second connecting portion 23 and is used to prevent or reduce the displacement between the bending members 21 so as to prevent the stacked bending members 21 in the bending assembly 20 from scattering. In addition, since the first connection portion 22 and the third connection portion 24 need to be bent with respect to the second connection portion 23 when the bending member 20 is changed from the unfolded state to the folded state, if the tightening structure 30 for fixing the bending member 20 is provided on the first connection portion 22 or the third connection portion 24, the bending of the first connection portion 22 and the third connection portion 24 with respect to the second connection portion 23 may be affected. Therefore, in the present embodiment, the tightening structure 30 is disposed on the second connecting portion 23, so that the bending element 20 can be bent in order while preventing the stacked bending elements 21 from scattering, compared with the tightening structure 30 disposed on the first connecting portion 22 or the second connecting portion 23.

Referring to fig. 1 and 2, in some embodiments, the second connecting portion 23 has a mounting hole 231, and the tightening structure 30 includes at least one mounting post 31, and the mounting post 31 is disposed through the mounting hole 231 to prevent or reduce displacement between the bending members 21. Specifically, referring to fig. 3, in some embodiments, the bending member 21 has a through hole 2311, and the through holes 2311 of the bending members 21 are connected to form the mounting hole 231. The mounting posts 31 pass through the through holes 2311 to fixedly connect the bending members 21 to prevent or reduce the displacement between the bending members 21, thereby preventing the stacked bending members 21 in the bending assembly 20 from falling apart.

More specifically, in some embodiments, each bending member 21 is provided with a through hole 2311, the bending assembly 20 includes a first side 201 and a second side 202 opposite to each other, and the plurality of bending members 21 are stacked in a direction from the first side 201 to the second side 202. The mounting post 31 includes a through portion 311 and a fixing portion 312 connected to the through portion 311. The penetrating portion 311 sequentially penetrates through the through holes 2311 of the plurality of bent pieces 21 in a direction from the first side 201 toward the second side 202, that is, the penetrating portion 311 penetrates through the mounting holes 231 formed by the plurality of through holes 2311 in a direction from the first side 201 toward the second side 202, and the fixing portion 312 can be exposed from the first side 201. On one hand, the penetrating portion 311 sequentially penetrates through the through holes 2311 of the bending pieces 21, so that the bending pieces 21 can be fixedly connected, and the stacked bending pieces 21 in the bending assembly 20 are prevented from scattering; on the other hand, since the fixing portion 312 can be exposed from the first side 201, it is convenient for the user to remove the mounting post 31 from the bending assembly 20 so as to increase, decrease and replace the bending piece 21 in the bending assembly 20.

In some embodiments, the through portion 311 and the sidewall of the mounting hole 231 are in interference fit. Because wear to establish portion 311 and the equal interference fit of lateral wall of mounting hole 231, so can make a plurality of bending member 21 in the subassembly 20 of buckling connect more firmly, be favorable to avoiding a plurality of range upon range of bending member 21 to scatter.

In particular, in some embodiments, the cross-sectional area of the fixing portion 312 is greater than the cross-sectional area of the mounting hole 231 in a direction D1 (shown in fig. 3) perpendicular to the extending direction of the through portion 311. Thus, the fixing portion 312 can be prevented from extending into the mounting hole 231, the fixing portion 312 can be always exposed from the first side 201, and the user can conveniently remove the mounting post 31 from the bending assembly 20, so as to increase, decrease and replace the bending piece 21 in the bending assembly 20.

In some embodiments, the current collecting plate 10 is used to be connected to the tab of the bare cell 400, so that current can be conducted between the current collecting plate 10 and the tab of the bare cell 400, and at least part of the mounting post is welded to the second connection portion 23. This not only prevents the stacked bending pieces 21 in the bending unit 20 from scattering, but also facilitates the orderly bending of the bending unit 20.

It should be noted that the number of the mounting posts 31 may be one or more, and is not limited herein.

Referring to fig. 4 and 5, in some embodiments, the tightening structure 30 may further include at least one fixing element 32, and the fixing element 32 is wound around the second connecting portion 23 to prevent or reduce the displacement between the bending elements 21. Illustratively, in some embodiments, after the plurality of bending members 21 are stacked to form the bending assembly 20, the fixing member 32 is wound around the second connecting portion 23 of the bending assembly 20, so as to prevent or reduce the displacement between the bending members 21, thereby preventing the plurality of stacked bending members 21 in the bending assembly 20 from scattering.

It should be noted that, in some embodiments, the fixing member 32 may be an adhesive tape, that is, after the plurality of bending members 21 are stacked to form the bending assembly 20, the adhesive tape is used to adhere and wrap the second connecting portion 23 of the bending assembly 20. Since the adhesive tape is adhered and wound on the second connecting portion 23 of the bending assembly 20, not only the scattering of the plurality of stacked bending pieces 21 in the bending assembly 20 can be avoided, but also the connection of the fixing member 32 and the bending assembly 20 can be more tight, so as to avoid the falling of the fixing member 32 from the bending assembly 20. Of course, in some embodiments, the fixing member 32 may also be a rope or a cable tie, which is not limited herein. In addition, the number of the fixing member 32 may be one, or may be plural, and is not limited herein.

In some embodiments, a portion of the second connection portion 23 is covered by the fixing member 32. This not only prevents the stacked bending pieces 21 in the bending unit 20 from scattering, but also facilitates the orderly bending of the bending unit 20.

In some embodiments, the collecting disc 10 is connected with at least one bending piece 21 to achieve the connection of the collecting disc 10 with the fixing piece 32. For example, referring to fig. 3, in some embodiments, bending assembly 20 includes a first bending member 2101, a second bending member 2102, a third bending member 2103, a fourth bending member 2104, and a fifth bending member 2105. Second bending element 2102 is stacked on first bending element 2101, third bending element 2103 is stacked on second bending element 2102, fourth bending element 2104 is stacked on third bending element 2103, fifth bending element 2105 is stacked on fourth bending element 2104, and first bending element 2101 is connected to collecting plate 10. Since the thickness of the connection part between the collecting disc 10 and the bending assembly 20 is necessarily increased if the collecting disc 10 is connected to each layer of bending member 21, in this embodiment, the collecting disc 10 is connected to the first bending member 2101 located at the bottom, which is not only beneficial to reducing the thickness of the collecting disc 10 to reduce the cost, but also does not affect the folding of the bending assembly 20.

In the embodiment shown in fig. 3, after the first bending member 2101 is connected to the current collecting plate 10, the second bending member 2102 is stacked on the first bending member 2101, the third bending member 2103 is stacked on the second bending member 2102, the fourth bending member 2104 is stacked on the third bending member 2103, the fifth bending member 2105 is stacked on the fourth bending member 2104, and finally the hoop structure 30 is mounted to form the current collector 100. Of course, the bending assembly 20 may be formed by the five bending members 21, the tightening structure 30 may be mounted on the bending assembly 20, and the bending assembly 20 with the tightening structure 30 may be connected to the collecting plate 10.

In some embodiments, the current collecting disk 10 may also be connected with a plurality of bending pieces 21, which is advantageous for connecting the current collecting disk 10 with the bending assembly 20 more tightly than with only one bending piece 21.

Referring to fig. 2, in some embodiments, the first connecting portion 22 is bent relative to the second connecting portion 23 to form a first fold 25, the third connecting portion 24 is bent relative to the second connecting portion 23 to form a second fold 26, and at least one end of the first fold 25 has a groove 27; and/or at least one end at the second fold 26 has a groove 27.

Folding of the bending assembly 20 is facilitated by the presence of the groove 27 at the first fold 25 and/or the second fold 26. In addition, the current collector 100 can be folded in a designated direction, and the current collector 100 can be prevented from being eccentric during the insertion process when the battery 2000 (shown in fig. 7) is assembled later.

Specifically, the first connecting portion 22 is bendable relative to the second connecting portion 23, and the first connecting portion 22 and the second connecting portion 23 are bent to form a first fold 25, that is, the first connecting portion 22 and the second connecting portion 23 are bent relative to each other at the first fold 25, the third connecting portion 24 is bendable relative to the second connecting portion 23, and the second connecting portion 26 is bent relative to the second connecting portion 23 at the second fold 26. In some embodiments, the first fold 25 has a groove 27 at both ends; alternatively, in some embodiments, both ends of the second fold 26 have grooves 27; alternatively, in some embodiments, one of the ends of the first fold 25 has a groove 27; alternatively, in some embodiments, one of the ends of the second fold 26 has a groove 27.

Referring to fig. 6, in some embodiments, the bending member 21 includes two opposite sides, wherein an edge of one side is formed with a positioning notch 214. Because the positioning notch 214 is formed in one side of the bending piece 21, the positioning notch 214 of each bending piece 21 is aligned in the process of assembling a plurality of bending pieces 21, and the reverse assembly of the bending assembly 20 can be avoided. This reduces the difficulty of assembling the current collector 100.

For example, referring to fig. 6, the bending member 21 includes a first side 215, a third side 217 and a second side 216 connected in sequence, wherein the first side 215 and the second side 216 are opposite, and the third side 217 is closer to the collecting tray 10. The edge of the second side 216 of the bending member 21 is provided with a positioning notch 214. During the assembly of the plurality of bending members 21, the positioning notch 214 of each bending member 21 is only required to be aligned, so that the second side 216 of each bending member 21 corresponds, and the reverse assembly of the bending assembly 20, that is, the first side 215 of one bending member 21 corresponds to the second side 217 of another bending member 21, can be avoided. This reduces the difficulty of assembling the current collector 100.

Referring to fig. 1, in some embodiments, the width of the current collecting plate 10 is greater than the width of the bending assembly 20, and the current collecting plate 10 has an avoiding gap 11, and when the battery 2000 (shown in fig. 7) is assembled later, the avoiding gap 11 is used for avoiding the explosion-proof valve, and the avoiding gap 11 penetrates through a part of the edge of the current collecting plate 10. Further, in some embodiments, the current collecting plate 10 may also have an escape hole 12, and the escape hole 12 is opposite to an end of the pole when the battery 2000 is assembled later.

Referring to fig. 7, in some embodiments, the present application further provides an end cap assembly 1000 for a battery 2000. The end cap assembly 1000 includes the cap body 300 and the current collector 100 described in any of the above embodiments. The current collector 100 is connected to the cover 300.

In the end cover assembly 1000 of the present application, the bending assembly 20 in the current collector 100 is provided as a multilayer structure, so that the rigidity of the bending assembly 20 is increased, the possibility of fracture of the bending assembly 20 is reduced, and therefore the problem that the current collector 100 is easy to fracture when in vibration fatigue is solved, and the service life of the current collector 100 is prolonged. In addition, since the tightening structure 30 is further provided to the bending member 20 to prevent or reduce the displacement between the bending members 21, scattering of the plurality of bending members 21 in the bending member 20 can be prevented.

Referring to fig. 7, in some embodiments, the present disclosure further provides a battery 2000. The battery 2000 includes a bare cell 400 and the current collector 100 described in any of the above embodiments. The end cap assembly 1000 is connected to the bare cell 400.

In the battery 2000 of the present application, the bending assembly 20 in the current collector 100 is provided as a multi-layer structure, which is beneficial to increase the rigidity of the bending assembly 20 and reduce the possibility of fracture of the bending assembly 20, so as to solve the problem that the current collector 100 is easy to fracture when in vibration fatigue, thereby prolonging the service life of the current collector 100. In addition, since the tightening structure 30 is further provided to the bending member 20 to prevent or reduce the displacement between the bending members 21, the scattering of the plurality of bending members 21 in the bending member 20 can be prevented.

Referring to fig. 8, in some embodiments, a battery pack 4000 is further provided. The battery pack 4000 includes a battery case 3000 and a battery 2000, and at least a part of the battery 2000 is accommodated in the battery case 3000.

In the battery box 3000 of this application, set up bending component 20 in the mass flow body 100 through with battery 2000 into multilayer structure, so be favorable to increasing bending component 20's rigidity, reduce the cracked possibility of bending component 20 to solve mass flow body 100 and be fragile problem when vibration fatigue, with the life of extension mass flow body 100. In addition, since the tightening structure 30 is further provided to the bending member 20 to prevent or reduce the displacement between the bending members 21, the scattering of the plurality of bending members 21 in the bending member 20 can be prevented.

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

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

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

Claims

1. A current collector, comprising:

a current collecting plate;

the bending assembly comprises a first connecting part, a second connecting part and a third connecting part which are sequentially connected, the first connecting part is connected with the current collecting disc, and the first connecting part and the third connecting part can be bent relative to the second connecting part; and

and the tightening structure is arranged on the bending component and is used for preventing or reducing the displacement between the bending pieces.

2. The current collector of claim 1, wherein the second connection portion defines a mounting hole, and wherein the tightening structure comprises at least one mounting post disposed through the mounting hole.

3. The current collector of claim 2, wherein the bending member has a through hole, the through holes of the bending members are communicated to form the mounting hole, the bending assembly comprises a first side and a second side opposite to each other, and the mounting post comprises:

the penetrating part sequentially penetrates through the through holes along the direction from the first side to the second side; and

and a fixing portion connected to the penetration portion, the fixing portion being capable of being exposed from the first side.

4. The current collector of claim 3, wherein the penetration is in interference fit with a sidewall of the mounting hole.

5. The current collector of claim 2, wherein the current collector disc is configured to be coupled to a tab, and wherein at least a portion of the mounting post is welded to the second coupling portion.

6. The current collector of claim 3, wherein the cross-sectional area of the fixing portion is greater than the cross-sectional area of the mounting hole in a direction perpendicular to the extension of the through-penetration portion.

7. The current collector of claim 1, wherein the tightening structure further comprises:

at least one fixing member wound around the second connecting portion.

8. The current collector of claim 7, wherein a portion of the second connection portion is covered by the fixing member.

9. The current collector of claim 1, wherein the first connection portion is bent to form a first fold relative to the second connection portion, wherein the third connection portion is bent to form a second fold relative to the second connection portion,

at least one end of the first crease is provided with a groove; and/or

At least one end of the second fold has a recess.

10. The current collector of claim 1, wherein the thickness of each of the bent pieces is in the range of [0.05mm,0.3mm ].

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

a cover body; and

a current collector as in claims 1-10, the cap being coupled to the current collector.

12. A battery, comprising:

a naked battery cell; and

the end cap assembly of claim 11, coupled to the bare cell.

13. A battery pack, comprising:

a battery box; and

the battery of claim 12, at least a portion of the battery being housed within the battery case.