Battery cell and top cover assembly thereof

Abstract

The utility model provides a battery cell and a top cover assembly thereof. The top cover assembly comprises an insulating sheet and a top cover, the insulating sheet comprises a first insulator sheet, a second insulator sheet and a connecting rib; the first insulator sheet and the second insulator sheet are located on the same plane, the first insulator sheet and the second insulator sheet are arranged at an interval, an interval gap is formed between the first insulator sheet and the second insulator sheet, the extending direction of the interval gap is parallel to the first direction, and the connecting rib is arranged in the interval gap. One side of the connecting rib in the second direction is connected with the first insulator sheet, the other side of the connecting rib in the second direction is connected with the second insulator sheet, and the second direction is perpendicular to the first direction; a deformation groove is formed in the end portion of at least one end of the connecting rib in the first direction, and at least one deformation hole is formed in the middle of the connecting rib. When the insulation sheet is pulled and bent, the deformation holes and the deformation grooves deform, so that the insulation sheet deforms, and the top cover assembly can be more easily mounted on the battery cell.

Description

Technical Field

[0001] The utility model relates to the technical field of battery cores, in particular to a battery core and a top cover assembly thereof. Background Art

[0002] Existing batteries pay more and more attention to the quality control of the cell manufacturing process and raw materials. The top cover is an important component of the battery cell, and the insulating sheet is located under the top cover sheet, which plays an insulating role between the bare cell and the top cover sheet. The insulating sheets on the market are generally one-piece injection molded. Therefore, during the production of the top cover, the insulating sheet is prone to plastic deformation, causing the insulating sheet to shrink, which will make it difficult to assemble the top cover and may also affect the sealing of the top cover. Utility Model Content

[0003] Based on this, it is necessary to provide a battery cell and a top cover assembly thereof to address the above technical problems.

[0004] A top cover assembly comprises: an insulating sheet; the insulating sheet comprises a first insulator sheet, a second insulator sheet and a connecting rib; the first insulator sheet and the second insulator sheet are in the same plane, the first insulator sheet and the second insulator sheet are arranged at an interval, a spacing gap is formed between the first insulator sheet and the second insulator sheet, the extension direction of the spacing gap is parallel to the first direction, the connecting rib is arranged in the spacing gap, the connecting rib is connected to the first insulator sheet on one side in the second direction, and the connecting rib is connected to the second insulator sheet on the other side in the second direction, and the second direction is perpendicular to the first direction; a deformation groove is provided at the end of at least one end of the connecting rib in the first direction, and at least one deformation hole is provided in the middle of the connecting rib.

[0005] In one embodiment, deformation grooves are respectively formed at the ends of both ends of the connecting rib.

[0006] In one embodiment, the connecting rib is provided with a plurality of deformation holes, and the deformation holes are distributed along the first direction.

[0007] In one embodiment, the deformation holes are equidistantly distributed along the first direction.

[0008] In one embodiment, the deformation hole includes a first sub-hole, a second sub-hole and a third sub-hole which are interconnected, the extension direction of the first sub-hole is parallel to the first direction, the first sub-hole is connected to the third sub-hole through the second sub-hole, and the extension direction of the third sub-hole is parallel to the first direction.

[0009] In one embodiment, the first sub-hole and the third sub-hole are at least partially offset in the second direction.

[0010] In one embodiment, a length of the first sub-hole in the first direction is equal to a length of the third sub-hole in the first direction.

[0011] In one embodiment, a first connecting portion is extended from one end of the first insulator piece close to the second insulator piece, a second connecting portion is extended from one end of the second insulator piece close to the first insulator piece, the connecting rib is connected to the first connecting portion on one side in the second direction, and the connecting rib is connected to the second connecting portion on the other side in the second direction.

[0012] In one embodiment, the first insulator piece, the second insulator piece and the connecting rib are integrally formed.

[0013] A battery cell comprises the top cover assembly described in any one of the above embodiments.

[0014] The beneficial effect provided by the utility model is that the insulating sheet in the top cover assembly is used to insulate the bare battery cell and the top cover. By setting a connecting rib between the first insulator sheet and the second insulator sheet in the insulating sheet, and opening a deformation groove at the end of at least one end of the connecting rib, and opening at least one deformation hole in the middle of the connecting rib, when the first insulator sheet and the second insulator sheet are pulled and bent in two opposite directions at the same time, the deformation hole and the deformation groove will be deformed, so that the connecting rib is stretched and bent, so that the entire insulating sheet is stretched and deformed, so that the insulating sheet can adapt to the size of the battery cell, and thus the top cover assembly can be more easily installed on the battery cell. Since the connecting rib has an elastic deformation function, during the process from injection molding to installation of the insulating sheet on the battery cell, the center distance of the first through hole and the second through hole can be ensured to be consistent with the center distance of the third through hole and the fourth through hole on the top cover sheet through the connecting rib, that is, the first through hole can always be aligned with the third through hole, and the second through hole can always be aligned with the fourth through hole, so as to facilitate installation. When the top cover assembly is installed on the battery cell, the insulating sheet can fit more closely on the battery cell, so that the top cover assembly has better sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of the three-dimensional structure of an insulating sheet in one direction in one embodiment;

[0016] Figure 2 In one embodiment Figure 1 A schematic diagram of the partially enlarged structure of part A;

[0017] Figure 3 is a schematic diagram of the three-dimensional structure of an insulating sheet in another direction in one embodiment;

[0018] Figure 4is a schematic diagram of the three-dimensional structure of a top cover sheet in one direction in one embodiment;

[0019] Figure 5 The figure is a schematic diagram of the three-dimensional structure in one direction after the insulation sheet and the top cover sheet are combined in one embodiment.

[0020] In the accompanying drawings, 10, insulating sheet; 100, first insulator sheet; 110, first through hole; 120, first mounting groove; 130, first positioning block; 140, positive electrode identifier; 200, second insulator sheet; 210, second through hole; 220, second mounting groove; 230, second positioning block; 240, negative electrode identifier; 300, connecting rib; 310, deformation groove; 320, deformation hole; 321, first sub-hole; 322, second sub-hole; 323, third sub-hole; 400, first connecting part; 500, second connecting part; 600, hot melt block; 70, top cover sheet; 710, first positioning groove; 711, third through hole; 720, second positioning groove; 721, fourth through hole; 800, positive pole; 900, negative pole. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0022] In one embodiment, Figure 1 As shown, a top cover assembly comprises: an insulating sheet 10; the insulating sheet 10 comprises a first insulator sheet 100, a second insulator sheet 200 and a connecting rib 300; the first insulator sheet 100 and the second insulator sheet 200 are in the same plane, the first insulator sheet 100 and the second insulator sheet 200 are arranged at an interval, a spacing gap is formed between the first insulator sheet 100 and the second insulator sheet 200, the extension direction of the spacing gap is parallel to the first direction, the connecting rib 300 is arranged in the spacing gap, the connecting rib 300 is connected to the first insulator sheet 100 on one side in the second direction, and the connecting rib 300 is connected to the second insulator sheet 200 on the other side in the second direction, and the second direction is perpendicular to the first direction; a deformation groove 310 is provided at the end of at least one end of the connecting rib 300 in the first direction, and at least one deformation hole 320 is provided in the middle of the connecting rib 300.

[0023] Specifically, the top cover assembly is used to cover the battery cell. The insulating sheet 10 in the top cover assembly is used to insulate the bare battery cell from the top cover. The connecting rib 300 is provided between the first insulator sheet 100 and the second insulator sheet 200 in the insulating sheet 10, and a deformation groove 310 is provided at the end of at least one end of the connecting rib 300, and at least one deformation hole 320 is provided in the middle of the connecting rib 300. Therefore, when the first insulator sheet 100 and the second insulator sheet 200 are pulled and bent in two opposite directions along the second direction, the deformation hole 320 and the deformation groove 310 will be deformed, so that the connecting rib 300 is stretched and bent in the second direction, thereby stretching and bending the entire insulating sheet 10 in the second direction. The stretched insulating sheet 10 can better adapt to the size of the battery cell, so that the top cover assembly can be more easily installed on the battery cell. Since the connecting rib 300 has an elastic deformation function, the connecting rib 300 can ensure that the center distances of the first through hole and the second through hole are consistent with the center distances of the third through hole and the fourth through hole on the top cover sheet 70 during the process from injection molding to installation on the battery cell, that is, the first through hole can always be aligned with the third through hole, and the second through hole can always be aligned with the fourth through hole, thereby facilitating installation. When the top cover assembly is installed on the battery cell, the insulating sheet 10 can fit more closely on the battery cell, so that the top cover assembly has better sealing performance.

[0024] In one embodiment, the first insulator sheet 100 is used to connect to the positive electrode part of the battery cell, and the second insulator sheet 200 is used to connect to the negative electrode part of the battery cell. Therefore, the first insulator sheet 100 is a positive electrode insulation sheet, and the first insulator sheet 100 is used to insulate the positive bare battery cell from the top cover; the second insulator sheet 200 is a negative electrode insulation sheet, and the second insulator sheet 200 is used to insulate the negative bare battery cell from the top cover.

[0025] In order to make the insulating sheet 10 easier to stretch, in one embodiment, Figure 2 As shown, deformation grooves 310 are respectively provided at the ends of both ends of the connecting rib 300. Specifically, when the first insulator sheet 100 and the second insulator sheet 200 are simultaneously pulled and bent in two opposite directions along the second direction, since the deformation grooves 310 are respectively provided at the ends of both ends of the connecting rib 300, the ends of the connecting rib 300 are more easily stretched and bent to deform, thereby making the insulating sheet 10 more easily stretched and deformed.

[0026] In order to make the insulating sheet 10 deform more when stretched, in one embodiment, Figure 1 and Figure 2As shown, the connecting rib 300 is provided with a plurality of deformation holes 320, and each of the deformation holes 320 is distributed along the first direction. Specifically, each of the deformation holes 320 on the connecting rib 300 is arranged in a row along the first direction. Through the above arrangement, when the first insulator sheet 100 and the second insulator sheet 200 are pulled and bent, each of the deformation holes 320 can be deformed at the same time, so that the deformation amplitude of the connecting rib 300 is larger, that is, the deformation amplitude of the insulating sheet 10 is larger.

[0027] In order to make the force on each of the deformation holes 320 more uniform, in one embodiment, Figure 1 and Figure 2 As shown, the deformation holes 320 are equidistantly distributed along the first direction. Specifically, by distributing the deformation holes 320 equidistantly along the first direction, when the first insulator sheet 100 and the second insulator sheet 200 are pulled and bent at the same time, the deformation holes 320 are subjected to more uniform force, so that the deformation degrees of the deformation holes 320 are the same, thereby avoiding the phenomenon that the side wall of the deformation hole 320 is broken due to the uneven force on the deformation hole 320.

[0028] In order to make the insulating sheet 10 more easily deformed by force, in one embodiment, Figure 2 As shown, the deformation hole 320 includes a first sub-hole 321, a second sub-hole 322 and a third sub-hole 323 that are interconnected, the extension direction of the first sub-hole 321 is parallel to the first direction, the first sub-hole 321 is connected to the third sub-hole 323 through the second sub-hole 322, and the extension direction of the third sub-hole 323 is parallel to the first direction. Specifically, by setting the deformation hole 320 as described above, since the first sub-hole 321 and the third sub-hole 323 of the deformation hole 320 extend along the first direction, the material of the connecting rib 300 in the first direction is less, the strength is lower, and it is better to bend. Therefore, when the first insulator piece 100 and the second insulator piece 200 are pulled and bent at the same time, the first sub-hole 321 and the third sub-hole 323 of the deformation hole 320 can be deformed more easily under force, so that the first insulator piece 100 and the second insulator piece 200 of the insulation piece 10 can be pulled and bent more easily, making the insulation piece 10 more likely to deform.

[0029] In order to make the deformation amplitude of the insulating sheet 10 larger, in one embodiment, Figure 2As shown, the first sub-hole 321 and the third sub-hole 323 are at least partially staggered in the second direction. Specifically, since the first sub-hole 321 and the second sub-hole 322 are at least partially staggered in the second direction, when the first insulator sheet 100 and the second insulator sheet 200 are simultaneously pulled and bent in two opposite directions along the second direction, the first sub-hole 321 and the third sub-hole 323 will be deformed at the same time, so that the deformation amplitude of the insulating sheet 10 is larger.

[0030] In order to ensure that the forces at both ends of the deformation hole 320 are the same, in one embodiment, Figure 2 As shown, the length of the first sub-hole 321 in the first direction is equal to the length of the third sub-hole 323 in the first direction. Specifically, since the length of the first sub-hole 321 is equal to the length of the second sub-hole 322, when the connecting rib 300 is pulled and bent to deform, the side wall of the first sub-hole 321 and the side wall of the second sub-hole 322 are subjected to the same force, thereby ensuring that the forces at both ends of the deformable hole 320 are the same, and avoiding the situation where the side wall at one end of the deformable hole 320 is subjected to excessive force and breaks.

[0031] In order to make the two sides of the connecting rib 300 more firmly connected to the first insulator piece 100 and the second insulator piece 200 respectively, in one embodiment, Figure 1 and Figure 2As shown, a first connection portion 400 is extended from one end of the first insulator piece 100 close to the second insulator piece 200, a second connection portion 500 is extended from one end of the second insulator piece 200 close to the first insulator piece 100, and a connection rib 300 is connected to the first connection portion 400 on one side in the second direction, and the connection rib 300 is connected to the second connection portion 500 on the other side in the second direction. Specifically, one end of the first connection portion 400 is vertically arranged on the first insulator piece 100, and the other end of the first connection portion 400 is vertically arranged on one side of the connection rib 300 in the second direction; one end of the second connection portion 500 is vertically arranged on the second insulator piece 200, and the other end of the second connection portion 500 is vertically arranged on the other side of the connection rib 300 in the second direction. The first insulator piece 100 and the second insulator piece 200 are on the same plane, the first connection portion 400 and the second connection portion 500 are arranged in parallel, and the connection rib 300 is not on the same plane as the first insulator piece 100 and the second insulator piece 200. Through the above arrangement, when the insulating sheet 10 is pulled, bent, and deformed, the first connecting part 400 and the second connecting part 500 will be subjected to force at the same time, so that the first connecting part 400 and the second connecting part 500 are inclined relative to the connecting rib 300, that is, the first connecting part 400 and the second connecting part 500 have a force unloading function, so that the connection structure between the connecting rib 300 of the insulating sheet 10 and the first insulator sheet 100 and the second insulator sheet 200 can be softer and not easily pulled off.

[0032] In order to make the insulating sheet 10 have a stronger structural strength, in one embodiment, the first insulator sheet 100, the second insulator sheet 200 and the connecting rib 300 are integrally formed. Specifically, the first insulator sheet 100, the second insulator sheet 200 and the connecting rib 300 are integrally injection molded, that is, the insulating sheet 10 is integrally injection molded. Through the above arrangement, the insulating sheet 10 can have a stronger structural strength, and the insulating sheet 10 is difficult to be pulled apart when being pulled and bent.

[0033] In order to ensure that the deformation grooves 310 and the deformation holes 320 are subjected to the same force when the insulation sheet 10 is pulled and bent, in one embodiment, Figure 2As shown, each of the deformation grooves 310 and each of the deformation holes 320 are aligned in the first direction. Specifically, since each of the deformation grooves 310 and each of the deformation holes 320 are aligned in the first direction, when the insulating sheet 10 is pulled and bent, each of the deformation grooves 310 and each of the deformation holes 320 will be subjected to the same force in the second direction, thereby ensuring that each of the deformation grooves 310 and each of the deformation holes 320 have the same deformation, thereby preventing each of the deformation grooves 310 or each of the deformation holes 320 from being subjected to excessive force and causing sidewall fracture.

[0034] In order to prevent the connecting rib 300 from being broken when being pulled and bent, in one embodiment, Figure 1 As shown, the distance between each of the deformation holes 320 and the first insulator sheet 100 is smaller than the distance between each of the deformation holes 320 and the second insulator sheet 200. Specifically, each of the deformation holes 320 is opened at a position close to the side of the connecting rib 300, that is, each of the deformation holes 320 is not located in the middle of the connecting rib 300. Through the above arrangement, when the insulating sheet 10 is pulled and bent, the force in the middle of the connecting rib 300 is the largest, and since each of the deformation holes 320 is not located in the middle of the connecting rib 300, the connecting rib 300 is not easily pulled and bent to break.

[0035] In order to allow the top cover assembly to be more stably mounted on the battery cell, in one embodiment, Figure 1 and Figure 3 As shown, the first insulator sheet 100 and the second insulator sheet 200 are respectively provided with a hot melt block 600. Specifically, the hot melt block 600 is provided at one end of the first insulator sheet 100 away from the second insulator sheet 200, and at one end of the second insulator sheet 200 away from the first insulator sheet 100. The hot melt block 600 has the characteristic of hot melting. When the top cover assembly is installed on the battery cell, the hot melt block 600 is connected to the battery cell after heating, so that the insulation sheet 10 can be more firmly connected to the battery cell, that is, the top cover assembly can be more firmly installed on the battery cell.

[0036] In order to allow the positive electrode column 800 and the negative electrode column 900 to pass through the insulating sheet 10, in one embodiment, Figure 1As shown, the first insulator sheet 100 is provided with a first through hole 110, and the first through hole 110 penetrates the first insulator sheet 100; the second insulator sheet 200 is provided with a second through hole 210, and the second through hole 210 penetrates the second insulator sheet 200. Specifically, by providing the first through hole 110 on the first insulator sheet 100, it is convenient for the positive pole 800 to pass through the first through hole 110 on the first insulator sheet 100 and connect with the positive terminal of the battery cell; by providing the second through hole 210 on the second insulator sheet 200, it is convenient for the positive pole 800 to pass through the second through hole 210 on the second insulator sheet 200 and connect with the negative terminal of the battery cell.

[0037] In order to stably place the positive electrode column 800 on the insulating sheet 10, in one embodiment, as shown in FIG. Figure 1 As shown, the first insulator sheet 100 is provided with a first mounting groove 120 around one side of the first through hole 110, the first through hole 110 is located in the first mounting groove 120, and the first mounting groove 120 is used to place the positive pole 800. The first through hole 110 is used to be passed through by the positive pole 800. Specifically, the first mounting groove 120 is provided on the first insulator sheet 100, and the shape of the first mounting groove 120 is adapted to the shape of the positive pole 800. By arranging the positive pole 800 in the first mounting groove 120, and at least a part of the positive pole 800 will pass through the first through hole 110, the positive pole 800 can be stably arranged on the insulating sheet 10.

[0038] In order to stably place the negative electrode column 900 on the insulating sheet 10, in one embodiment, Figure 1 As shown, the second insulator sheet 200 is provided with a second mounting groove 220 around one side of the second through hole 210, the second through hole 210 is located in the second mounting groove 220, the second mounting groove 220 is used to place the negative pole 900, and the second through hole 210 is used to be passed through by the negative pole 900. Specifically, the second mounting groove 220 is provided on the second insulator sheet 200, and the shape of the second mounting groove 220 is adapted to the shape of the negative pole 900. By arranging the negative pole 900 in the second mounting groove 220, and at least a part of the negative pole 900 will pass through the second through hole 210, the negative pole 900 can be stably arranged on the insulating sheet 10.

[0039] In order to enhance the structural strength of the top cover assembly, in one embodiment, Figure 4 and Figure 5As shown, the top cover assembly further includes a top cover sheet 70, and the top cover sheet 70 is used to be connected to a side of the insulating sheet 10 facing away from the first mounting groove 120 and the second mounting groove 220. Specifically, when the insulating sheet 10 is installed on the battery cell, the structural strength of the top cover assembly can be enhanced by installing the top cover sheet 70 on a side of the insulating sheet 10 facing away from the battery cell.

[0040] In order to make the top cover sheet 70 and the insulation sheet 10 more firmly connected, in one embodiment, Figure 3 and Figure 5 As shown, the first insulator sheet 100 is provided with a first positioning block 130 on a side facing away from the first mounting groove 120, and the second insulator sheet 200 is provided with a second positioning block 230 on a side facing away from the second mounting groove 220. The first positioning block 130 and the second positioning block 230 are located on the same side of the insulating sheet 10. The first positioning groove 710 and the second positioning groove 720 are respectively provided at both ends of the top cover sheet 70. The bottom of the first positioning groove 710 is provided with a third through hole 711, and the bottom of the second positioning groove 720 is provided with a fourth through hole 721. When the top cover sheet 70 is connected to the insulating sheet 10, the first positioning block 130 will be located in the first positioning groove 710, the second positioning block 230 will be located in the second positioning groove 720, the first through hole 110 is aligned with and connected to the third through hole 711, and the second through hole 210 is aligned with and connected to the fourth through hole 721. Specifically, when the top cover sheet 70 is installed on the insulating sheet 10, the first positioning block 130 on the first insulator sheet 100 will be located in the first positioning groove 710 of the top cover sheet 70, and the second positioning block 230 on the second insulator sheet 200 will be located in the second positioning groove 720 of the top cover sheet 70. At the same time, the positive pole 800 will be located in the first installation groove 120 of the first insulator sheet 100, and the positive pole 800 will sequentially pass through the first through hole 110 on the first insulator sheet 100 and the third through hole 711 on the top cover sheet 70; the negative pole 900 will be located in the second installation groove 220 of the second insulator sheet 200, and the negative pole 900 will sequentially pass through the second through hole 210 on the second insulator sheet 200 and the fourth through hole 721 on the top cover sheet 70. Through the above arrangement, the top cover sheet 70 and the insulating sheet 10 can be more firmly connected.

[0041] In order to facilitate users to distinguish the installation position of the insulating sheet 10 in the battery cell, in one embodiment, as shown in FIG. Figure 1 and Figure 5As shown, the first insulator sheet 100 is provided with a positive electrode identifier 140, and the second insulator sheet 200 is provided with a negative electrode identifier 240. Specifically, since the first insulator sheet 100 is installed near the positive end of the battery cell, and the second insulator sheet 200 is installed near the negative end of the battery cell, the positive electrode identifier 140 is provided on the first insulator sheet 100, and the negative electrode identifier 240 is provided on the second insulator sheet 200, so that the user can easily distinguish the installation position of the insulating sheet 10 in the battery cell.

[0042] In one embodiment, a battery cell includes the top cover assembly described in any of the above embodiments. Specifically, by using the top cover assembly provided by the present application, the insulating sheet 10 can be stretched so that the insulating sheet 10 can adapt to the size of the battery cell, thereby making it easier to install the top cover assembly on the battery cell. When the top cover assembly is installed on the battery cell, the deformation hole 320 and the deformation groove 310 on the connecting rib 300 will shrink back to their original shape, so that the insulating sheet 10 can fit more closely on the battery cell, making the top cover assembly have better sealing.

[0043] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0044] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A top cover assembly, characterized in that: include: Insulation sheet; The insulating sheet comprises a first insulator sheet, a second insulator sheet and a connecting rib; The first insulator piece and the second insulator piece are in the same plane, the first insulator piece and the second insulator piece are arranged at an interval, a gap is formed between the first insulator piece and the second insulator piece, the extension direction of the gap is parallel to the first direction, the connecting rib is arranged in the gap, one side of the connecting rib in the second direction is connected to the first insulator piece, and the other side of the connecting rib in the second direction is connected to the second insulator piece, and the second direction is perpendicular to the first direction; A deformation groove is formed at at least one end of the connecting rib in the first direction, and at least one deformation hole is formed in the middle of the connecting rib.

2. The top cover assembly according to claim 1, characterized in that: The ends of both ends of the connecting rib are respectively provided with deformation grooves.

3. The top cover assembly according to claim 1, characterized in that: The connecting rib is provided with a plurality of deformation holes, and the deformation holes are distributed along the first direction.

4. The top cover assembly according to claim 3, characterized in that: The deformation holes are distributed equidistantly along the first direction.

5. The top cover assembly according to claim 1, characterized in that: The deformable hole includes a first sub-hole, a second sub-hole and a third sub-hole which are connected to each other, the extension direction of the first sub-hole is parallel to the first direction, the first sub-hole is connected to the third sub-hole through the second sub-hole, and the extension direction of the third sub-hole is parallel to the first direction.

6. The top cover assembly according to claim 5, characterized in that: The first sub-hole and the third sub-hole are at least partially offset in the second direction.

7. The top cover assembly according to claim 5, characterized in that: A length of the first sub-hole in the first direction is equal to a length of the third sub-hole in the first direction.

8. The top cover assembly according to any one of claims 1 to 7, characterized in that: A first connecting portion is extended from one end of the first insulator piece close to the second insulator piece, and a second connecting portion is extended from one end of the second insulator piece close to the first insulator piece. The connecting rib is connected to the first connecting portion on one side in the second direction, and is connected to the second connecting portion on the other side in the second direction.

9. The top cover assembly according to claim 1, characterized in that: The first insulator piece, the second insulator piece and the connecting rib are integrally formed.

10. A battery cell, characterized in that: A top cover assembly comprising any one of claims 1-9.

Images