Cover plate assembly, battery cell and battery pack

Abstract

The utility model provides a cover plate assembly, a battery cell and a battery pack, and the cover plate assembly comprises a cover main body, insulating plastic and two insulating brackets, the connecting part extends in the first direction and is connected to the first face of the cover body, the first abutting part is arranged on the surface, away from the first face, of the connecting part and protrudes in the direction away from the first face, and the insulating support is arranged on the side edge, in the second direction, of the insulating plastic and is connected with the first face of the cover body. The insulating support is provided with a second abutting portion connected with the first abutting portion in the second direction, and the first direction is perpendicular to the second direction. According to the cover plate assembly provided by the embodiment of the invention, the size of the connecting sheet in the second direction can be reduced, the connecting resistance is reduced, the heat production power of the battery cell is reduced, the energy utilization rate is improved, the charging duration of the battery cell is shortened, and the discharging duration of the battery cell is prolonged, so that the size of the second stopping part in the second direction is increased; the supporting effect on the roll core body is improved, and the reliability of the battery core is improved.

Description

Technical Field

[0001] The present disclosure relates to the field of battery technology, and in particular to a cover plate assembly, a battery cell and a battery pack. Background Art

[0002] When assembling the battery cells, you need to first spread out the two winding cores, weld the pole ears and connecting pieces of the two winding cores together, then move the connecting piece to the pole of the cover assembly, weld the connecting piece to the pole, and then fold the core bodies of the two winding cores along the bending line of the pole ears.

[0003] In the related art, a supporting protrusion for supporting the core body of the battery cell is provided on the insulating plastic of the cover assembly. In order to prevent the supporting protrusion from scratching the pole ear, the bending line of the pole ear is set to be closer to the outside, which results in a larger spacing between the two pole ears, resulting in a larger size of the connecting piece used to support the pole ear. However, a larger size of the connecting piece will result in a larger connection resistance between the pole ear and the pole column, resulting in a higher heat generation efficiency of the battery cell. Utility Model Content

[0004] In order to solve the above technical problems or at least partially solve the above technical problems, the present disclosure provides a cover plate assembly, a battery cell and a battery pack.

[0005] The present application discloses a cover assembly, comprising: a cover body, having a first surface and a second surface arranged opposite to each other; an insulating plastic, comprising a connecting portion and a first stop portion, wherein the connecting portion extends along a first direction and is connected to the first surface, and the first stop portion is arranged on a surface of the connecting portion away from the first surface, and the first stop portion protrudes in a direction away from the first surface; an insulating bracket, arranged on a side of the insulating plastic in the second direction, and the insulating bracket is connected to the first surface of the cover body, and the insulating bracket has a second stop portion, and in the second direction, the first stop portion is connected to the second stop portion; wherein the first direction is perpendicular to the second direction.

[0006] Optionally, the insulating bracket is detachably connected to the cover body.

[0007] Optionally, at least one group of mutually cooperating protrusions and grooves is included, the protrusion is provided on one of the insulating bracket and the cover body, and the groove is provided on the other of the insulating bracket and the cover body.

[0008] Optionally, the two ends of the cover body along the first direction are respectively a first end and a second end, the insulating bracket includes a free end and a hinged end, the hinged end of the insulating bracket is hinged to the first end, the free end of the insulating bracket is detachably connected to the cover body, and the rotation plane of the insulating bracket is perpendicular to a third direction, the third direction is perpendicular to the second direction, and the third direction is perpendicular to the first direction.

[0009] Optionally, the two ends of the cover body along the first direction are respectively a first end and a second end, the insulating bracket includes two sub-brackets, both of the two sub-brackets extend along the first direction, and both of the two sub-brackets include a free end and a hinged end, the hinged end of one of the two sub-brackets is hinged to the first end, and the hinged end of the other of the two sub-brackets is hinged to the second end, and the free ends of the two sub-brackets are detachably connected to the cover body.

[0010] Optionally, the insulating plastic has an embedding groove opening toward the insulating bracket, and the insulating bracket is provided with a flange matched with the embedding groove.

[0011] The present application also discloses a battery cell, comprising: a shell, the shell defining a accommodating cavity with an opening; a battery cell body, the battery cell body is arranged in the accommodating cavity, and the battery cell body includes a winding core body and two pole ears, and the two pole ears are arranged on the winding core body at intervals; according to the cover plate assembly provided by the above disclosure, the cover plate assembly is sealed at the opening of the accommodating cavity and has a pole, the first stop portion abuts against the battery cell body, and the second stop portion abuts against the battery cell body; a connecting piece, connecting the pole ear and the pole.

[0012] Optionally, the battery cell body includes two winding cores, the two winding cores are arranged opposite to each other along the second direction, each of the winding core includes a winding core body and two pole ears, and the connecting piece is used to connect the two oppositely arranged pole ears with their corresponding poles; the pole ear includes a bending section and a connecting section, the bending section extends along the second direction, and the bending section is connected to the winding core body, the connecting section extends along a third direction, and one end of the connecting section is connected to an end of the bending section away from the winding core body, the connecting piece is arranged between the two bending sections, and the connecting piece is connected to the side surface of the corresponding two connecting sections facing the winding core body; wherein, the third direction is perpendicular to the second direction, and the third direction is perpendicular to the first direction.

[0013] Optionally, the dimension T1 of the core body (21) in the second direction and the dimension W1 of the cover body (31) in the second direction satisfy: 0.35*W1≤T1≤0.475*W1; and / or, the dimension T1 of the core body (21) in the second direction and the distance S2 from the surface where the connecting piece (40) is connected to the connecting section (222) to the cover body (31) satisfy: 0.031*T1+0.5mm≤S2≤0.057*T1+0.8mm; and / or, the dimension T1 of the core body (21) in the second direction and the distance S2 from the surface where the connecting piece (40) is connected to the connecting section (222) to the cover body (31) satisfy: 0.031*T1+0.5mm≤S2≤0.057*T1+0.8mm; The dimension T1, the distance S2 from the surface where the connecting piece (40) is connected to the connecting section (222) to the cover body (31), and the dimension W3 of the connecting piece in the second direction satisfy the following conditions: T1≤W3≤2*(T1-S2); and / or the dimension W1 of the cover body (31) in the second direction, the dimension W2 of the insulating plastic (33) in the second direction, and the dimension W4 of the insulating bracket (34) in the second direction satisfy the following conditions: 0.5*(W1-W2-1mm)≤W4≤0.5*(W1-W2-6mm).

[0014] The present application also discloses a battery pack, comprising: a battery cell provided according to the above disclosure.

[0015] Compared with the prior art, the technical solution provided by the embodiments of the present disclosure has the following advantages:

[0016] According to the cover assembly provided by the embodiment of the present disclosure, by arranging an insulating bracket on the side of the insulating plastic in the second direction, the insulating bracket can strengthen the cover body, improve the structural strength of the cover assembly, and improve the reliability of the cover assembly; moreover, in this way, the size of the first stop portion in the second direction can be made smaller, the size of the second stop portion in the second direction can be made larger, and the total size of the first stop portion and the second stop portion in the second direction is larger, so that the first stop portion and the second stop portion can better form support, thereby improving the support effect of the cover assembly.

[0017] According to the battery cell provided in the embodiment of the present disclosure, by setting the above-mentioned cover plate assembly, when assembling the battery cell, the insulating bracket can be installed on the cover body after the two core bodies are folded in half, so as to prevent the second stop portion from scratching the battery cell body, so that the bending line of the pole ear can be set closer to the center position of the pole column, thereby reducing the size of the connecting piece in the second direction, reducing the production cost of the connecting piece, reducing the connection resistance between the pole ear and the pole column, reducing the heat generation power of the battery cell, improving the reliability of the battery cell, improving the energy utilization rate, shortening the charging time of the battery cell, extending the discharge time of the battery cell, and improving the overall performance of the battery pack; at the same time, the supporting effect of the cover plate assembly on the core body can be improved, avoiding the problem of compressive deformation caused by insufficient support of the core body when the battery cell is placed inverted or used in other working conditions, thereby improving the reliability of the battery cell.

[0018] According to the battery pack provided by the embodiment of the present disclosure, by setting the above-mentioned battery cells, when assembling the battery cells, the insulating bracket can be installed on the cover body after the two winding core bodies are folded in half to prevent the second stop portion from scratching the battery cell body, so that the bending line of the pole ear can be set closer to the center position of the pole column, thereby reducing the size of the connecting piece in the second direction, reducing the connection resistance between the pole ear and the pole column, reducing the heat generation power of the battery cell, improving the reliability of the battery cell, improving the energy utilization rate, shortening the charging time of the battery cell, extending the discharge time of the battery cell, avoiding the problem of compressive deformation caused by insufficient support of the winding core body when the battery cell is placed inverted or used in other working conditions, improving the reliability of the battery cell, and improving the overall performance of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0021] Figure 1 A three-dimensional diagram of a battery cell according to some embodiments of the present disclosure;

[0022] Figure 2 for Figure 1 An exploded view of the battery cell in the figure;

[0023] Figure 3 for Figure 1 A cross-sectional view of a local structure of a battery cell;

[0024] Figure 4 for Figure 3The enlarged view of point A in the middle;

[0025] Figure 5 for Figure 3 The enlarged view of point B in the middle;

[0026] Figure 6 An exploded view of some cover plate assemblies provided for the present disclosure;

[0027] Figure 7 Schematic diagrams of the structures of other cover plate assemblies provided in the present invention.

[0028] Among them, 100, battery cells;

[0029] 10. housing; 11. accommodating chamber;

[0030] 20. battery cell body; 2. winding core; 21. winding core body; 22. pole ear; 221. bending section; 222. connecting section;

[0031] 30. Cover plate assembly; 31. Cover body; 311. Card slot; 312. Limiting slot; 32. Pole; 33. Insulating plastic; 331. First stop portion; 332. Fitting slot; 333. Connecting portion; 34. Insulating bracket; 341. Second stop portion; 342. Card convex; 343. Sub-bracket; 344. Limiting convex; 345. Support frame; 3451. Horizontal plate; 3452. Vertical plate; 3453. Reinforcing rib; 3454. Reinforcing convex; 346. Insulating stop plastic; 3461. Flange;

[0032] 40. Connecting piece. DETAILED DESCRIPTION

[0033] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0034] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0035] Reference Figure 1-Figure 3 The battery cell 100 includes a shell 10, a battery cell body 20, a cover assembly 30 and a connecting piece 40. The shell 10 defines a accommodating cavity 11 with an opening. The battery cell body 20 is disposed in the accommodating cavity 11, and the battery cell body 20 includes two winding cores 2. The two winding cores 2 are arranged opposite to each other along a second direction. For example, the second direction can be the length direction of the battery cell 100.

[0036] The two winding cores 2 each include a winding core body 21 and two tabs 22, the two tabs 22 are arranged on the winding core body 21 at intervals along the first direction, and the two tabs 22 are respectively a positive tab 22 and a negative tab 22, the tabs 22 of the two winding cores 2 are arranged oppositely and at intervals along the first direction, and the connecting sheet 40 is used to connect the two oppositely arranged tabs 22 and their corresponding poles 32. For example, the first direction may be the length direction of the battery cell 100.

[0037] The cover plate assembly 30 includes a cover body 31 and two poles 32, the cover body 31 extends along a first direction, the two poles 32 are arranged on the cover body 31 at intervals along the first direction, and the two poles 32 correspond to the positive pole tab 22 and the negative pole tab 22 one by one, the cover body 31 is sealed at the opening of the accommodating cavity 11, and the poles 32 are connected to the pole tabs 22 through the connecting sheet 40. For example, the surface of the cover body 31 facing the accommodating cavity 11 is the first surface, and the surface of the cover body 31 opposite to the first surface in the height direction of the battery cell 100 is the second surface.

[0038] Reference Figure 2-Figure 4 The tab 22 includes a bending section 221 and a connecting section 222. The bending section 221 extends along a second direction, for example, the second direction may be the width direction of the battery cell 100; and the bending section 221 is connected to the winding core body 21, and the connecting section 222 extends along a third direction, for example, the third direction may be the height direction of the battery cell 100; and one end of the connecting section 222 is connected to one end of the bending section 221 away from the winding core body 21. The connecting piece 40 is disposed between the two bending sections 221, and the connecting piece 40 is connected to the corresponding two connecting sections 222.

[0039] When assembling the battery cell 100, the two winding cores 2 can be first spread out along the second direction, the pole ears 22 of the two winding cores 2 can be arranged close to each other, the connecting piece 40 and the pole ear 22 can be welded together, and then the welded initial structural component can be translated to the cover plate assembly 30, the pole column 32 and the connecting piece 40 can be welded, and then the pole ear 22 can be folded along the bending line of the pole ear 22, the bending section 221 can be folded to the vertical connecting section 222, and the two winding core bodies 21 can be folded to be parallel to the third direction, and then the folded secondary structural component can be placed as a whole in the accommodating cavity 11, and the opening of the accommodating cavity 11 can be sealed with the cover plate assembly 30 to complete the assembly of the battery cell 100.

[0040] It should be explained that the bending line of the tab 22 refers to the boundary line between the bending section 221 and the connecting section 222 ; during the production process of the battery cell body 20 , the bending section 221 and the connecting section 222 of the tab 22 are sheet structures in a flat state.

[0041] The connecting piece 40 may be connected to the side surface of the corresponding two connecting sections 222 facing the core body 21 , and the connecting piece 40 may also be connected to the side surface of the corresponding two connecting sections 222 facing the cover plate assembly 30 .

[0042] Reference Figure 2-Figure 7 The present application discloses a cover assembly 30, including a cover body 31, an insulating plastic 33 and an insulating bracket 34, wherein the cover body 31 has a first surface and a second surface that are oppositely arranged; for example, the cover body 31 may be a plain aluminum plate.

[0043] Reference Figure 6 and Figure 7 , the insulating plastic 33 includes a connecting portion 333 and a first stop portion 331, the connecting portion 333 extends along the first direction, and the connecting portion 333 is connected to the first surface, the first stop portion 331 is arranged on the surface of the connecting portion 333 away from the first surface, and the first stop portion 331 protrudes in the direction away from the first surface. For example, the connecting portion 333 includes a first connecting surface and a second connecting surface arranged opposite to each other, the first connecting surface is connected to the first surface, the first stop portion 331 is arranged on the second connecting surface, and the first stop portion 331 is a protrusion arranged on the second connecting surface. For example, when the cover plate assembly 30 is arranged in the battery cell 100, the first stop portion 331 is used to stop the core body 21 of the battery cell 100.

[0044] The insulating bracket 34 is connected to the first surface, and is disposed on the side surface of the insulating plastic 33 along the second direction. For example, the insulating bracket 34 is disposed on both sides of the insulating plastic 33 in the second direction.

[0045] The insulating support 34 has a second stop portion 341. In the second direction, the first stop portion 331 is connected to the second stop portion 341. For example, the second stop portion 341 is used to stop the winding core body 21 of the battery cell 100. The first direction is perpendicular to the second direction.

[0046] By arranging the insulating bracket 34 on the side of the insulating plastic 33 , the insulating bracket 34 can strengthen the cover body 31 , thereby improving the structural strength of the cover assembly 30 and improving the reliability of the cover assembly 30 .

[0047] When the cover plate assembly 30 is applied to the battery cell 100, when assembling the battery cell 100, the two winding cores 2 can be first spread out along the second direction, the pole ears 22 of the two winding cores 2 can be arranged close to each other, the connecting piece 40 and the pole ear 22 can be welded together, and then the welded initial structural component can be translated to the cover plate assembly 30, the pole column 32 can be welded to the connecting piece 40, and then the pole ear 22 can be folded along the bending line of the pole ear 22, the bending section 221 can be folded to the vertical connecting section 222, and the two winding core bodies 21 can be folded to be parallel to the third direction, and then the insulating bracket 34 can be installed on the cover body 31, and the secondary structural component after the insulating bracket 34 is installed can be placed in the accommodating cavity 11 as a whole, and the opening of the accommodating cavity 11 can be sealed with the cover plate assembly 30 to complete the assembly of the battery cell 100.

[0048] Since the insulating plastic 33 is provided with an insulating bracket 34 in the second direction, and the portion of the insulating bracket 34 corresponding to the first stop portion 331 of the insulating plastic 33 is provided with a second stop portion 341 corresponding to the winding core body 21, the size of the first stop portion 331 in the second direction can be made smaller, so that the bending line of the pole ear 22 can be set closer to the center position of the pole column 32, thereby reducing the distance between the bending sections 221 of the two pole ears 22 in the second direction, reducing the size of the connecting piece 40 in the second direction, reducing the production cost of the connecting piece 40, reducing the connection resistance between the pole ear 22 and the pole column 32, reducing the heat generation power of the battery cell 100, improving the energy utilization rate, shortening the charging time of the battery cell 100, extending the discharge time of the battery cell 100, and improving the overall performance of the battery pack.

[0049] At the same time, since the insulating bracket 34 can be installed after the pole ear 22 is bent, the second stop portion 341 of the insulating bracket 34 can be made larger in the second direction, so that the total size of the first stop portion 331 and the second stop portion 341 in the second direction is larger; optionally, the distance between the two outer surfaces of the two second stop portions 341 arranged opposite to each other in the second direction is greater than or equal to the width of the two core bodies 21 in the second direction. In this way, the first stop portion 331 and the second stop portion 341 can better support the core body 21, improve the support effect of the cover plate assembly 30 on the core body 21, and avoid the problem of compression deformation caused by insufficient support of the core body 21 when the battery cell 100 is placed upside down or used in other working conditions.

[0050] For example, the projection of the bending section 221 on the projection plane completely falls within the projection range of the insulating plastic 33 on the projection plane, wherein the projection plane is perpendicular to the third direction; that is, the size of the insulating plastic 33 in the second direction is greater than or equal to the outer surface spacing of the two oppositely arranged bending sections 221 in the second direction. When installing the insulating bracket 34, this can effectively prevent the insulating bracket 34 from scratching the tab 22, reliably ensure the safety of the tab 22, and improve the reliability of the battery cell 100.

[0051] According to the cover assembly 30 provided in the embodiment of the present disclosure, by arranging an insulating bracket 34 on the side of the insulating plastic 33 in the second direction, the insulating bracket 34 can strengthen the cover body 31, improve the structural strength of the cover assembly 30, and improve the reliability of the cover assembly 30; and in this way, the size of the first stop portion 331 in the second direction can be made smaller, and the size of the second stop portion 341 in the second direction can be made larger, so that the total size of the first stop portion 331 and the second stop portion 341 in the second direction is larger, so that the first stop portion 331 and the second stop portion 341 can better form support, thereby improving the support effect of the cover assembly 30.

[0052] Reference Figure 6 According to some embodiments provided by the present disclosure, the insulating bracket 34 is detachably connected to the cover body 31. For example, the insulating bracket 34 and the cover body 31 can be detachably connected by snapping, and the insulating bracket 34 and the cover body 31 can also be detachably connected by being fixedly connected with fasteners. Before the welding connecting piece 40 is welded to the pole 32, it is convenient to remove the insulating bracket 34 from the cover body 31 to avoid the insulating bracket 34 interfering with the winding core 2; after the pole ear 22 is bent to a preset position, it is convenient to install the insulating bracket 34 on the cover body 31 to ensure the support effect of the cover plate assembly 30 on the winding core body 21, thereby improving the assembly efficiency of the battery cell 100.

[0053] When the insulating bracket 34 and the cover body 31 are detachably connected by means of a snap connection, at least one set of mutually cooperating snap protrusions 342 and snap grooves 311 are provided between the insulating bracket 34 and the cover body 31, one of the insulating bracket 34 and the cover body 31 is provided with a snap protrusion 342, and the other of the insulating bracket 34 and the cover body 31 is provided with a snap groove 311. The snap protrusion 342 and the snap groove 311 cooperate with each other to realize a detachable connection between the insulating bracket 34 and the cover body 31, which has a simple structure and is easy to disassemble and assemble.

[0054] For example, there are multiple groups of mutually fitting protrusions 342 and slots 311. Specifically, there may be two, three or more groups of mutually fitting protrusions 342 and slots 311. Multiple groups of mutually fitting protrusions 342 and slots 311 are spaced apart along the first direction. This can improve the connection strength between the insulating bracket 34 and the cover body 31, so that the insulating bracket 34 and the cover body 31 are reliably connected, and the overall structure of the cover assembly 30 is more reliable, so that the cover assembly 30 can reliably support the core body 21, thereby improving the reliability of the battery cell 100.

[0055] For example, the insulating bracket 34 and the cover body 31 can also be connected as an integral part. Optionally, the insulating bracket 34 and the cover body 31 can be connected as an integral part by riveting, welding or gluing. This can ensure the connection strength between the insulating bracket 34 and the cover body 31, so that the insulating bracket 34 and the cover body 31 are reliably connected, and the overall structure of the cover assembly 30 is more reliable, so that the cover assembly 30 can reliably support the core body 21, thereby improving the reliability of the battery cell 100.

[0056] Reference Figure 7 According to some embodiments provided by the present disclosure, the two ends of the cover body 31 along the first direction are respectively a first end and a second end, the insulating bracket 34 includes a free end and a hinged end, the hinged end of the insulating bracket 34 is hinged to the first end, the free end of the insulating bracket 34 is detachably connected to the cover body 31, and the rotation plane of the insulating bracket 34 is perpendicular to the third direction, the third direction is perpendicular to the second direction, and the third direction is perpendicular to the first direction.

[0057] In this way, the hinged structure between the insulating bracket 34 and the cover body 31 can play a certain guiding or limiting role in the movement of the insulating bracket 34, so that the insulating bracket 34 can be reliably rotated to a preset position, avoiding the insulating bracket 34 from scratching the pole ear 22 during rotation, thereby improving the reliability of the cover assembly 30 and effectively ensuring the safety of the pole ear 22.

[0058] Optionally, the insulating bracket 34 can be slidably disposed on the cover body 31, so that the sliding pair between the insulating bracket 34 and the cover body 31 can play a certain guiding or limiting role in the movement of the insulating bracket 34, so that the insulating bracket 34 can reliably slide to a preset position, avoiding the insulating bracket 34 from scratching the pole ear 22 during the sliding process, thereby improving the reliability of the cover assembly 30 and effectively ensuring the safety of the pole ear 22.

[0059] Reference Figure 7 According to some embodiments provided by the present disclosure, the two ends of the cover body 31 along the first direction are respectively a first end and a second end, the insulating bracket 34 includes two sub-brackets 343, the two sub-brackets 343 both extend along the first direction, and the two sub-brackets 343 both include a free end and a hinged end, the hinged end of one of the two sub-brackets 343 is hinged to the first end, and the hinged end of the other of the two sub-brackets 343 is hinged to the second end, and the free ends of the two sub-brackets 343 are detachably connected to the cover body 31.

[0060] When assembling the battery cell 100, the two sub-brackets 343 can be rotated to a position where the angle between them and the cover body 31 is greater than or equal to 90° by rotating the sub-bracket 343, and the two sub-brackets 343 are opened to avoid the pole ear 22 and the core body 21. Then, the welded initial structural member is translated to the cover plate assembly 30, the pole 32 is welded to the connecting piece 40, and then the pole ear 22 is folded along the bending line of the pole ear 22, the bending section 221 is folded to the vertical connecting section 222, and the two core bodies 21 are folded to be parallel to the third direction. Then, the sub-bracket 343 is rotated toward the cover body 31, and the two sub-brackets 343 are retracted to the position connected to the cover body 31, and the sub-bracket 343 is connected and fixed to the cover body 31. Then, the folded secondary structural member is placed as a whole in the accommodating cavity 11, and the opening of the accommodating cavity 11 is sealed with the cover plate assembly 30 to complete the assembly of the battery cell 100.

[0061] The insulating bracket 34 is configured as two sub-brackets 343 rotatably arranged on the cover body 31, and the overall length of the two sub-brackets 343 is relatively short, so that the limiting and guiding effects formed by the transmission pair of each sub-bracket 343 on the sub-bracket 343 can be more reliable, so that the two sub-brackets 343 can be reliably opened and retracted, and the risk of the insulating bracket 34 scratching the pole ear 22 during rotation can be more effectively avoided or reduced, thereby further improving the reliability of the cover assembly 30 and effectively ensuring the safety of the pole ear 22.

[0062] By configuring the insulating bracket 34 as two sub-brackets 343 rotatably arranged on the cover body 31, when the two sub-brackets 343 are opened, the spacing of the cover assembly 30 in the second direction can be reduced, so that the control assembly can more conveniently open and retract the two sub-brackets 343, shortening the opening and retracting time of the two sub-brackets 343 and improving the assembly efficiency of the battery cell 100.

[0063] Reference Figure 7 According to some embodiments provided by the present disclosure, the cover plate assembly 30 further includes a limiting structure, which includes a limiting groove 312 and a limiting protrusion 344 that cooperate with each other. One of the sub-bracket 343 and the cover body 31 is provided with a limiting groove 312, and the other is provided with a limiting protrusion 344. In this way, the insulating bracket 34 can be reliably fixed relative to the cover body 31, preventing the sub-bracket 343 from rotating relative to the cover body 31 and scratching the core body 21, thereby improving the reliability of the cover plate assembly 30, effectively ensuring the safety of the core body 21, and improving the reliability of the battery cell 100.

[0064] Reference Figure 5 and Figure 6According to some specific embodiments provided by the present disclosure, the insulating plastic 33 has an engaging groove 332 opening toward the insulating bracket 34, and the insulating bracket 34 is provided with a flange 3461 adapted to the engaging groove 332; this can effectively ensure the insulation between the cover body 31 and the pole ear 22, and improve the reliability of the battery cell 100. Optionally, the surface of the flange 3461 facing the core body 21 is away from the core body 21 relative to the surface of the insulating stop plastic 346 facing the core body 21, which can effectively avoid or reduce the risk of the flange 3461 scratching the pole ear 22, effectively ensure the safety of the pole ear 22, and improve the reliability of the battery cell 100.

[0065] For example, refer to Figure 6 and Figure 7 According to some embodiments provided by the present disclosure, the insulating bracket 34 includes a supporting frame 345 and an insulating stop plastic 346. The cross-section of the supporting frame 345 is T-shaped or L-shaped. For example, the supporting frame 345 may include a sheet-like horizontal plate 3451 and a sheet-like vertical plate 3452. The largest surface of the horizontal plate 3451 is parallel to the first surface of the cover body 31. The vertical plate 3452 is connected to the horizontal plate 3451, and the largest surface of the vertical plate 3452 is perpendicular to the largest surface of the horizontal plate 3451. Specifically, the horizontal plate 3451 is provided with a connecting structure connected to the cover body 31. For example, the connecting structure may be a clamping structure, or a fastener.

[0066] The insulating stop plastic 346 covers a surface of the side of the horizontal plate 3451 away from the cover body 31 , and the insulating stop plastic 346 abuts against the insulating plastic 33 in the second direction. For example, the flange 3461 may be a part of the insulating stop plastic 346 .

[0067] By arranging the horizontal plate 3451 and the vertical plate 3452 which are arranged perpendicular to each other, the structural strength between the horizontal plate 3451 and the vertical plate 3452 can be made higher, and the horizontal plate 3451 can reliably support the insulating stop plastic 346, so that the insulating bracket 34 has a higher strength. At the same time, the insulating bracket 34 can use less material as a whole, so that the production cost of the insulating bracket 34 is lower.

[0068] For example, refer to Figure 2 and Figure 3 A reinforcing structure may be provided on the insulating bracket 34. Optionally, the reinforcing structure may be a reinforcing rib 3453 or a reinforcing protrusion 3454. This may further improve the structural strength of the insulating bracket 34, more effectively prevent the insulating bracket 34 from bending and deforming, improve the reliability of the insulating bracket 34, and improve the reliability of the cover assembly 30.

[0069] Reference Figure 1-Figure 5The present application also discloses a battery cell 100, including a shell 10, a battery cell body 20, a cover plate assembly 30 and a connecting piece 40, the shell 10 defines a accommodating cavity 11 with an opening; the battery cell body 20 is arranged in the accommodating cavity 11, and the battery cell body 20 has pole ears 22 that are opposite and spaced apart along a first direction; according to the cover plate assembly 30 provided by the above disclosure, the cover plate is sealed at the opening of the accommodating cavity 11, and the cover plate has a pole 32, a first stop portion 331 stops the battery cell body 20, and a second stop portion 341 stops the battery cell body 20; the connecting piece 40 connects the pole ear 22 and the pole 32.

[0070] According to the battery cell 100 provided in the embodiment of the present disclosure, by setting the above-mentioned cover plate assembly 30, when assembling the battery cell 100, the insulating bracket 34 can be installed on the cover body 31 after the two core bodies 21 are folded in half, so that the size of the first stop portion 331 in the second direction can be made smaller, and the bending line of the pole ear 22 can be set closer to the center position of the pole column 32, thereby reducing the size of the connecting piece 40 in the second direction, reducing the production cost of the connecting piece 40, reducing the connection resistance between the pole ear 22 and the pole column 32, reducing the heat generation power of the battery cell 100, improving the reliability of the battery cell 100, improving the energy utilization rate, shortening the charging time of the battery cell 100, extending the discharge time of the battery cell 100, and improving the overall performance of the battery pack; at the same time, the support effect of the cover plate assembly 30 on the core body 21 can be improved, avoiding the problem of compressive deformation caused by insufficient support of the core body 21 when the battery cell 100 is placed inverted or used in other working conditions, and improving the reliability of the battery cell 100.

[0071] Reference Figure 1-Figure 5 According to some embodiments provided by the present disclosure, the battery cell body 20 includes two winding cores 2, and the two winding cores 2 are arranged opposite to each other along the second direction. For example, the second direction can be the length direction of the battery cell 100; the two winding cores 2 each include a winding core body 21 and two pole tabs 22, and the two pole tabs 22 are arranged on the winding core body 21 at intervals along the first direction, and the two pole tabs 22 are respectively a positive pole tab 22 and a negative pole tab 22, and the pole tabs 22 of the two winding cores 2 are arranged opposite to each other and at intervals along the first direction, and the connecting sheet 40 is used to connect the two oppositely arranged pole tabs 22 and their corresponding poles 32 together. For example, the first direction can be the length direction of the battery cell 100.

[0072] The cover plate assembly 30 includes a cover body 31 and two poles 32. The cover body 31 extends along a first direction. The two poles 32 are arranged on the cover body 31 at intervals along the first direction, and the two poles 32 correspond to the positive pole tab 22 and the negative pole tab 22 one by one. The cover body 31 is sealed at the opening of the accommodating cavity 11, and the poles 32 are connected to the pole tabs 22 through a connecting sheet 40.

[0073] The pole ear 22 includes a bending section 221 and a connecting section 222, wherein the bending section 221 extends along a second direction, for example, the second direction may be the width direction of the battery cell 100; and the bending section 221 is connected to the core body 21, and the connecting section 222 extends along a third direction, for example, the third direction may be the height direction of the battery cell 100; and one end of the connecting section 222 is connected to an end of the bending section 221 away from the core body 21. The connecting piece 40 is disposed between the two bending sections 221, and the connecting piece 40 is connected to the corresponding two connecting sections 222 on one side surface facing the core body 21; wherein the third direction is perpendicular to the second direction, and the third direction is perpendicular to the first direction.

[0074] By aligning the connecting sheet 40 and the corresponding two connecting sections 222 toward one side surface of the winding core body 21, the connecting sheet 40 can form a reliable support for the pole ear 22, so that the pole ear 22 can be maintained in a bent state, effectively reducing or avoiding the problem of inverted insertion of the pole ear 22, and improving the reliability of the battery cell 100.

[0075] Reference Figure 3 According to some embodiments provided by the present disclosure, the dimension W1 of the cover body 31 in the second direction is not less than 25 mm and not more than 85 mm, that is, the dimension W1 of the accommodating cavity 11 in the second direction is not less than 25 mm and not more than 85 mm. Optionally, the dimension W1 of the cover body 31 in the second direction can be 25 mm, 30 mm, 35 mm, 40 mm, 45 mm, 50 mm, 55 mm, 60 mm, 65 mm, 70 mm, 75 mm, 80 mm, 85 mm. In this way, the cover body 31 can be applied to batteries 100 of different sizes, thereby improving the applicability of the cover assembly 30.

[0076] According to some embodiments provided by the present disclosure, the dimension T1 of the core body 21 in the second direction and the dimension W1 of the cover body 31 in the second direction satisfy: 0.35*W1≤T1≤0.475*W1; this allows the two core bodies 21 to be gap-matched with the accommodating cavity 11 in the second direction, facilitating the production and assembly of the battery cell. At the same time, this allows the two core bodies 21 to occupy a moderate proportion in the accommodating cavity 11, ensuring the ratio between the core body 21 and the electrolyte, and improving the overall performance of the battery cell.

[0077] According to some embodiments provided by the present disclosure, the dimension S1 of the spacing between the connecting piece 40 and the bending section 221 in the second direction is not less than 0.3 mm and not greater than 4 mm; for example, the dimension S1 of the spacing between the connecting piece 40 and the bending section 221 in the second direction can be 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2.0 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, 3.0 mm, 3.1 mm, 3.2 mm, 3.3 mm, 3.4 mm, 3.5 mm, 3.6 mm, 3.7 mm, 3.8 mm, 3.9 mm, 4.0 mm. In this way, it can be prevented that the dimension S1 between the connecting piece 40 and the bending section 221 in the second direction is too small, causing the connecting piece 40 to scratch the pole ear 22, or causing the pole ear 22 to be pulled during the bending process. It can also be prevented that the dimension S1 between the connecting piece 40 and the bending section 221 in the second direction is too large, causing the supporting area of ​​the connecting piece 40 to the pole ear 22 to be smaller, resulting in poor supporting effect of the connecting piece 40 on the pole ear 22. The connecting piece 40 has a better supporting effect on the pole ear 22, so that the pole ear 22 can be maintained in a bent state, effectively reducing or avoiding the problem of inverted insertion of the pole ear 22, and improving the reliability of the battery cell 100.

[0078] According to some embodiments provided by the present disclosure, the dimension T1 of the core body 21 in the second direction and the distance S2 from the surface where the connecting piece 40 is connected to the connecting section 222 to the cover body 31 satisfy: 0.031*T1+0.5mm≤S2≤0.057*T1+0.8mm; in the process of assembling the battery cell 100, when the pole ear 22 is laid flat and the pole ear 22 is connected to the connecting piece 40, a certain gap is prevented between the pole ear 22 and the cover plate assembly 21, thereby preventing the pole ear from being damaged by the cover plate assembly 21 and ensuring the safety of the pole ear 22.

[0079] According to some embodiments provided by the present disclosure, the dimension T1 of the core body 21 in the second direction, the distance S2 from the surface where the connecting piece 40 is connected to the connecting section 222 to the cover body 31, and the dimension W3 of the connecting piece 40 in the second direction satisfy: T1≤W3≤2*(T1-S2); this can ensure that the connecting piece 40 is effectively connected to the tabs 22 on the two core bodies 21, ensure that the two cores 2 can work at the same time, and improve the reliability of the battery cell 100. At the same time, it can prevent the connecting piece 40 from being too large, causing the connecting piece 40 to scratch the tab 22, or causing the tab 22 to be pulled during the bending process, thereby ensuring the safety of the tab 22.

[0080] According to some embodiments provided by the present disclosure, the dimension W1 of the cover body 31 in the second direction, the dimension W2 of the insulating plastic 33 in the second direction, and the dimension W4 of the insulating bracket 34 in the second direction satisfy: 0.5*(W1-W2-1mm)≤W4≤0.5*(W1-W2-6mm); this can prevent the dimension W4 of the insulating bracket 34 in the second direction from being too large, causing the insulating bracket 34 to protrude from the edge of the cover body 31 in the second direction, thereby causing the insulating bracket 34 to interfere with the packaging of the cover assembly 30, thereby facilitating the assembly of the battery cell 100; moreover, this can make the dimension W4 of the insulating bracket 34 in the second direction as large as possible, so that the first stop portion 331 and the second stop portions 341 on both sides of it are larger in size in the second direction, so that the support area of ​​the cover plate assembly 30 for the battery cell body 20 is larger, thereby improving the support effect of the cover plate assembly 30 on the battery cell body 20.

[0081] The present application also discloses a battery pack, including: a battery cell 100 provided according to the above disclosure.

[0082] According to the battery pack provided by the embodiment of the present disclosure, by setting the above-mentioned battery cell 100, when assembling the battery cell 100, the insulating bracket 34 can be installed on the cover body 31 after the two winding core bodies 21 are folded in half, so that the size of the first stop portion 331 in the second direction can be made smaller, and the bending line of the pole ear 22 can be set closer to the center position of the pole column 32, thereby reducing the size of the connecting piece 40 in the second direction, reducing the connection resistance between the pole ear 22 and the pole column 32, reducing the heat generation power of the battery cell 100, improving the reliability of the battery cell 100, improving the energy utilization rate, shortening the charging time of the battery cell 100, and extending the discharge time of the battery cell 100, avoiding the problem of compressive deformation caused by insufficient support of the winding core body 21 when the battery cell 100 is placed inverted or used in other working conditions, improving the reliability of the battery cell 100, and improving the overall performance of the battery pack.

[0083] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0084] The above description is only a specific embodiment of the present disclosure, so that those skilled in the art can understand or implement the present disclosure. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to the embodiments described herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A cover plate assembly, characterized in that: include: The cover body has a first surface and a second surface which are arranged opposite to each other; The insulating plastic comprises a connecting portion and a first stop portion, wherein the connecting portion extends along a first direction and is connected to the first surface, the first stop portion is arranged on a surface of the connecting portion away from the first surface, and the first stop portion protrudes in a direction away from the first surface; The insulating bracket is arranged on the side of the insulating plastic in the second direction, and the insulating bracket is connected to the first surface. The insulating bracket has a second stop portion, and in the second direction, the first stop portion is connected to the second stop portion; wherein the first direction is perpendicular to the second direction.

2. The cover plate assembly according to claim 1, characterized in that: The insulating bracket is detachably connected to the cover body.

3. The cover plate assembly according to claim 2, characterized in that: It comprises at least one group of mutually matching protrusions and grooves, wherein one of the insulating support and the cover body is provided with the protrusion, and the other of the insulating support and the cover body is provided with the groove.

4. The cover plate assembly according to claim 1, characterized in that: The two ends of the cover body along the first direction are respectively a first end and a second end, the insulating bracket includes a free end and a hinged end, the hinged end of the insulating bracket is hinged to the first end, the free end of the insulating bracket is detachably connected to the cover body, and the rotation plane of the insulating bracket is perpendicular to the third direction, the third direction is perpendicular to the second direction, and the third direction is perpendicular to the first direction.

5. The cover plate assembly according to claim 1, characterized in that: The two ends of the cover body along the first direction are respectively a first end and a second end, the insulating bracket includes two sub-brackets, both of the two sub-brackets extend along the first direction, and both of the two sub-brackets include a free end and a hinged end, the hinged end of one of the two sub-brackets is hinged to the first end, and the hinged end of the other of the two sub-brackets is hinged to the second end, and the free ends of the two sub-brackets are detachably connected to the cover body.

6. The cover plate assembly according to any one of claims 1 to 5, characterized in that: The insulating plastic has an embedding groove which opens toward the insulating bracket, and the insulating bracket is provided with a flange which matches the embedding groove.

7. A battery cell, characterized in that: include: A housing, wherein the housing defines a receiving cavity having an opening; A battery cell body, wherein the battery cell body is disposed in the accommodating cavity, and the battery cell body comprises a winding core body and two tabs, wherein the two tabs are spaced apart and disposed on the winding core body; and The cover plate assembly according to any one of claims 1 to 6, wherein the cover plate assembly is sealed at the opening of the accommodating cavity and has a pole, the first stop portion abuts against the battery cell body, and the second stop portion abuts against the battery cell body; A connecting piece connects the pole lug and the pole.

8. The battery cell according to claim 7, characterized in that: The battery cell body includes two winding cores, the two winding cores are arranged opposite to each other along the second direction, each winding core includes a winding core body and two pole ears, and the connecting sheet is used to connect the two oppositely arranged pole ears and their corresponding poles together; The pole ear comprises a bending section and a connecting section, the bending section extends along the second direction and is connected to the core body, the connecting section extends along the third direction, and one end of the connecting section is connected to an end of the bending section away from the core body, the connecting piece is arranged between the two bending sections, and the connecting piece is connected to one side surface of the corresponding two connecting sections facing the core body; The third direction is perpendicular to the second direction, and the third direction is perpendicular to the first direction.

9. The battery cell according to claim 8, characterized in that: The dimension T1 of the winding core body in the second direction and the dimension W1 of the cover body in the second direction satisfy: 0.35*W1≤T1≤0.475*W1; And / or, the dimension T1 of the winding core body in the second direction and the distance S2 from the surface where the connecting piece and the connecting section are connected to the cover body satisfy: 0.031*T1+0.5mm≤S2≤0.057*T1+0.8mm; And / or, a dimension T1 of the winding core body in the second direction, a distance S2 from a surface of the connecting piece connected to the connecting section to the cover body, and a dimension W3 of the connecting piece in the second direction satisfy: T1≤W3≤2*(T1-S2); And / or, the dimension W1 of the cover body in the second direction, the dimension W2 of the insulating plastic in the second direction and the dimension W4 of the insulating bracket in the second direction satisfy: 0.5*(W1-W2-1mm)≤W4≤0.5*(W1-W2-6mm).

10. A battery pack, characterized in that: include: A battery cell according to any one of claims 7 to 9.

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