Hard-shell battery cell

Abstract

The utility model provides a hard-shell battery cell, which belongs to the technical field of secondary batteries and comprises a shell, the shell comprises a shell body and a cover plate assembly covering the shell body, a naked battery cell is arranged in the shell, a mounting space is reserved between the top of the naked battery cell and the cover plate assembly, and a tab is arranged in the mounting space. The tab comprises a first connecting part, a second connecting part and a bending part, the first connecting part is connected with the naked battery cell, the second connecting part is connected with the cover plate assembly, the bending part forms an arch-shaped area, and at least part of the insulation protection piece is supported in the arch-shaped area. According to the utility model, the insulation protection piece can support the bending part of the tab, so that the bending amount of the tab is reduced, and the tab can be prevented from being inserted into the naked battery cell. And meanwhile, the thickness of the insulation protection piece is matched with the number of layers of the tabs and the thickness of the single layer of the tabs, so that the problems that the tabs are difficult to bend, materials are wasted and the like are solved, and the problems that the insulation protection piece cannot support the bent parts of the tabs sufficiently, the tabs are easily inserted into the naked battery cell and the like are solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to secondary battery technical field, especially relate to a hard shell electric core. BACKGROUND

[0002] In the assembling process of the electric core, the tab is pressed due to the limitation of the installation space, and the redundant part of the tab will be bent under the action of the pressure. When the redundancy of the tab is long, the tab is easy to be inserted into the bare electric core and contact the positive and negative pole pieces of the bare electric core, which leads to internal short circuit of the electric core and produces a safety hazard. In the related art, in order to avoid the tab from being inserted into the bare electric core, some schemes adjust the welding tool size and adjust the welding position to reduce the redundancy of the tab, but when the redundancy of the tab is too small, the first layer of the tab is easy to be torn in the assembling process of the electric core, which leads to the bifurcation of the tab; some schemes reduce the height of the bare electric core to reserve enough space for the tab to bend and avoid the contact between the tab and the bare electric core after the tab is bent, but when the height of the bare electric core is reduced, the volume of the bare electric core is reduced, and the total energy storage amount of the electric core is reduced, which sacrifices the volume energy density of the electric core. SUMMARY

[0003] In view of the above-mentioned shortcomings of the prior art, the purpose of the utility model is to provide a hard shell electric core to solve the problem that the tab is easy to be inserted into the bare electric core in the prior art.

[0004] To achieve the above-mentioned purpose and other related purposes, the utility model provides a hard shell electric core, which comprises:

[0005] A shell, which comprises a shell body and a cover plate assembly arranged on the shell body;

[0006] A bare electric core, which is arranged in the shell, and has an installation space between the top of the bare electric core and the cover plate assembly;

[0007] A tab, which is arranged in the installation space, comprises a first connecting part, a second connecting part and a bending part between the first connecting part and the second connecting part, the first connecting part is connected with the bare electric core, the second connecting part is connected with the cover plate assembly, and the bending part is bent to form an arc region;

[0008] An insulation protection piece, which is at least partially supported in the arc region;

[0009] Wherein, the number of layers of the tab is N, the thickness of a single layer of the tab is S, the thickness of the insulation protection piece is H, and 0.07(NxS)≤H≤0.1(NxS).

[0010] Optionally, the insulation protection piece is attached to the surface of the bending part close to the arc region.

[0011] Optionally, the tab extends from the bare cell to the cover plate assembly, the edge of the tab close to the bare cell is a first edge, the edge of the tab close to the cover plate assembly is a second edge, the overhanging amount of the edge of the insulation protection piece beyond the first edge in the extension direction of the tab is L1, the overhanging amount of the edge of the insulation protection piece beyond the second edge in the extension direction of the tab is L2, L1≥5mm, L2≥5mm.

[0012] Optionally, the tab extends from the bare cell to the cover plate assembly, the two edges of the insulation protection piece in the width direction of the tab respectively beyond the two edges of the tab in the width direction of the tab, the overhanging amount of the edge of the insulation protection piece beyond the edge of the tab in the width direction of the tab is L3, L3≥5mm.

[0013] Optionally, the tab extends from the bare cell to the cover plate assembly, the tab has a first central axis arranged in the extension direction of the tab, the insulation protection piece has a second central axis arranged in the extension direction of the tab, the projections of the first central axis and the second central axis in the thickness direction of the tab coincide with each other.

[0014] Optionally, the insulation protection piece has a gap between the surface close to the arc region of the bending part.

[0015] Optionally, the insulation protection piece has a first adhesive part, a second adhesive part and a void part between the first adhesive part and the second adhesive part, the first adhesive part is adhered on the bare cell, the second adhesive part is adhered on the second connecting part, the void part has a gap between the surface close to the arc region of the bending part.

[0016] Optionally, no adhesive layer is arranged on the void part, the void part has a first extension area at least partially covering the bare cell and a second extension area at least partially covering the second connecting part.

[0017] Optionally, the tab extends from the bare cell to the cover plate assembly, the size of the first extension area in the extension direction of the tab is Y1, the size of the second extension area in the extension direction of the tab is Y2, Y1≤10mm, Y2≤10mm.

[0018] Optionally, the insulation protection piece is arranged around the tab and surrounds the tab at least one round.

[0019] As described above, the rigid-shell battery cell of this utility model has the following beneficial effects: Since the insulating protective component is at least partially supported in the arc-shaped area formed by the bending of the tab, when the tab is compressed during the assembly of the battery cell and continues to bend under pressure, or when the tab continues to bend under residual stress after the battery cell is assembled, the insulating protective component can provide support for the bending of the tab, reduce the overall bending amount of the tab, and help prevent the tab from continuing to bend and being inserted into the bare battery cell, thereby improving the safety performance of the battery cell. Meanwhile, in this utility model, the number of tab layers is N, the thickness of a single tab layer is S, and the thickness of the insulating protective component is H, with 0.07(N×S)≤H≤0.1(N×S). This ensures that the thickness of the insulating protective component matches the number of tab layers and the thickness of a single tab layer. This helps to avoid the insulating protective component being too thick and strong, which would result in the tab being too strong and difficult to bend, thus leading to material waste. It also helps to avoid the insulating protective component being too thin and weak, which would result in insufficient support for the tab at the bending part of the tab, and the tab still being easily inserted into the bare cell. Attached Figure Description

[0020] Figure 1 This is one of the schematic diagrams showing the bonding of the insulating protective component with the surface of the bent portion of the electrode near the arc-shaped area in an embodiment of this utility model;

[0021] Figure 2 This is one of the schematic diagrams showing a gap between the insulating protective component and the surface of the bent portion of the electrode near the arc-shaped area in an embodiment of this utility model;

[0022] Figure 3 This is a second schematic diagram showing the bonding of the insulating protective component with the surface of the bent portion of the electrode near the arc-shaped area in an embodiment of this utility model;

[0023] Figure 4 This is a second schematic diagram showing a gap between the insulating protective component and the surface of the bent portion of the electrode near the arc-shaped area in an embodiment of this utility model;

[0024] Figure 5 This is a schematic diagram showing the edge of the insulating protective component extending beyond the edge of the electrode tab in an embodiment of this utility model;

[0025] Figure 6 This is a schematic diagram of the cross-sectional structure of the connection points between the tabs and the connectors and the bare battery cells in an embodiment of this utility model.

[0026] Explanation of reference numerals in the attached drawings: 1. Shell body; 2. Cover plate body; 3. Bare cell; 4. Connector; 5. Electrode; 6. Insulating protection component; 7. Gap; 8. First edge; 9. Second edge; 10. Third edge; 11. First connecting part; 12. Second connecting part; 13. Bending part. Detailed Implementation

[0027] The following specific embodiments illustrate the implementation of the present application, and those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the specification.

[0028] It is understood that the structure, proportion, size, etc. shown in the drawings attached to the specification are only used to cooperate with the content disclosed in the specification for those skilled in the art to understand and read, and are not used to limit the implementation conditions of the present application, so they do not have technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" in the specification are only for the convenience of clear description, and are not used to limit the scope of the present application. The change or adjustment of the relative relationship, without substantially changing the technical content, is also considered as the scope of the present application.

[0029] Please refer to Figures 1 to 6 The present embodiment provides a hard shell battery cell, which comprises a shell and a bare battery cell 3, a tab 5 and an insulation protection piece 6 arranged in the shell. The shell comprises a shell body 1 and a cover plate assembly arranged on the shell body 1, and the top of the bare battery cell 3 and the cover plate assembly have a mounting interval. The tab 5 comprises a first connecting part 11 and a second connecting part 12, the first connecting part 11 is connected with the bare battery cell 3, and the second connecting part 12 is connected with the cover plate assembly. In the present embodiment, the tab 5 extends from the bare battery cell 3 to the cover plate assembly within the mounting interval.

[0030] In the present embodiment, the cover plate assembly comprises a cover plate body 2 and a connecting piece 4, and the second connecting part 12 is connected with the connecting piece 4, that is, the bare battery cell 3 is connected with the connecting piece 4 of the cover plate assembly through the tab 5. The tab 5 usually comprises a positive tab and a negative tab, the positive tab is formed by connecting the positive tabs of the bare battery cell 3 outwardly, and the negative tab is formed by connecting the negative tabs of the bare battery cell 3 outwardly.

[0031] When the battery cell is assembled, the bare battery cell 3 is usually placed in the shell body 1 first, and then the cover plate assembly is arranged on the opening of the shell body 1 to complete the packaging of the battery cell. The cover plate assembly and the top of the bare battery cell 3 leave an interval for accommodating the structure of the tab 5, that is, the mounting interval.

[0032] The tab 5 is bent within the mounting interval, that is, the tab 5 is in a bent state within the mounting interval. Specifically, as shown in Figure 6As shown, in the present embodiment, the tab further comprises a bending portion 13 located between the first connecting portion 11 and the second connecting portion 12, and the bending portion 13 is bent to form an arc-shaped region. The insulating protective piece 6 is arranged in the installation space, and at least partially supported in the arc-shaped region and supports the bending portion 13. When the tab is pressed during the assembly of the battery cell and continues to be bent under the pressure, or after the assembly of the battery cell is completed and the tab continues to be bent under the residual stress, the insulating protective piece 6 can provide support to the bending portion 13 of the tab, reduce the bending amount of the whole tab, and help to avoid the tab from continuing to be bent and inserted into the bare battery cell 3, thereby improving the safety performance of the battery cell.

[0033] The number of layers of the tab 5 is N, the thickness of a single layer of the tab 5 is S, and the thickness of the insulating protective piece 6 is H, and 0.07(NxS)≤H≤0.1(NxS). In the present embodiment, the insulating protective piece 6 is an insulating adhesive paper, which has the advantages of good insulation, moderate strength, low cost, etc.

[0034] If the thickness of the insulating protective piece 6 is too large, it will easily lead to the overall strength of the tab 5 being too large, and thus the tab 5 is difficult to bend during the assembly of the battery cell. If forced assembly is performed, the tab 5 will be easily broken at a local region due to stress concentration. At the same time, if the overall strength of the tab 5 is too high, the elasticity will be insufficient, the vibration absorption capacity of the tab 5 will be reduced, and the connection between the tab 5 and the bare battery cell 3 and the connection between the tab 5 and the connecting piece 4 will be easily separated, thereby affecting the reliability of the battery cell. If the thickness of the insulating protective piece 6 is too high, the amount of the insulating protective piece 6 will also increase, leading to material waste.

[0035] If the thickness of the insulating protective piece 6 is too low, the strength of the insulating protective piece 6 will be insufficient, the support of the insulating protective piece 6 to the tab 5 at the bending portion of the tab 5 will be insufficient, and the tab 5 will still be easily inserted into the bare battery cell 3 during the assembly of the battery cell, leading to internal short circuit of the battery cell and safety hazards. At the same time, if the thickness of the insulating protective piece 6 is too low, the insulation capacity of the insulating protective piece 6 will also be reduced, the risk of internal short circuit of the battery cell will be increased, and the reliability of the battery cell will be reduced.

[0036] In the present embodiment, the thickness of the insulating protective piece 6 is adapted to the number of layers of the tab 5 and the thickness of a single layer of the tab 5, which helps to avoid the problems of the overall strength of the tab 5 being too high due to the excessive thickness and strength of the insulating protective piece 6, the tab 5 being easily broken, the connection points being easily separated and falling off, and material waste, and also helps to avoid the problems of the insulating protective piece 6 being insufficient in strength due to the excessive thinness of the insulating protective piece 6, the support of the insulating protective piece 6 to the tab 5 at the bending portion of the tab 5 being insufficient, and the tab 5 still being easily inserted into the bare battery cell 3. The thickness of the insulating protective piece 6 being adapted to the number of layers of the tab 5 and the thickness of a single layer of the tab 5 also helps to avoid the problems of the insulating protective piece 6 being insufficient in insulation capacity due to the excessive thinness of the insulating protective piece 6.

[0037] Compared with the technical solution in the related art of adjusting the welding position to reduce the redundancy of the tab 5, the redundancy of the tab 5 in the embodiment is unchanged, which is conducive to avoiding problems such as easy tearing of the first layer of the tab 5 and splitting of the tab 5 in the assembly process of the battery cell due to the small redundancy of the tab 5. Compared with the scheme in the related art of reducing the height of the bare battery cell 3 to reserve enough space for the tab 5 to be bent to avoid the contact between the tab 5 after being bent and the bare battery cell 3, the height of the bare battery cell 3 in the embodiment can remain unchanged, which is conducive to maintaining the total energy storage amount of the battery cell without sacrificing the volumetric energy density of the battery cell.

[0038] Specifically, the number of layers N of the tab 5 is usually 5-200, and the thickness S of a single layer of the tab 5 is usually 1 μm-20 μm. For example, in the embodiment, the thickness of a single layer of the positive tab is 15 μm, and the number of layers is 49; the thickness of a single layer of the negative tab is μm, and the number of layers is 50.

[0039] The surface of the bending part close to the arc region is an inner bending surface, as shown in Figure 1 and Figure 3 and Figure 5 As shown in some optional embodiments, the insulating protective member 6 is attached to the surface of the bending part of the tab 5 close to the arc region, that is, the insulating protective member 6 is completely attached to the inner bending surface of the bending part, so that the connection between the insulating protective member 6 and the tab 5 is more reliable, and the attachment process is also simpler.

[0040] Specifically, as shown in Figure 5 , the edge of the tab 5 close to the bare battery cell 3 is a first edge 8, the edge of the tab 5 close to the connecting member 4 is a second edge 9, the overhanging amount of the edge of the insulating protective member 6 beyond the first edge 8 in the extension direction of the tab 5 is L1, and the overhanging amount of the edge of the insulating protective member 6 beyond the second edge 9 in the extension direction of the tab 5 is L2, L1≥5 mm, and L2≥5 mm. The part of the edge of the insulating protective member 6 beyond the first edge 8 and the second edge 9 can be attached to the bare battery cell 3 or the connecting member 4, respectively, which is conducive to increasing the attachment range of the insulating protective member 6 and making the connection of the insulating protective member 6 more reliable. At the same time, when the insulating protective member 6 is stressed, part of the stress can be directly transmitted to the bare battery cell 3 or the connecting member 4, reducing the stress on the tab 5, which is conducive to avoiding the tab 5 from falling off or separating due to excessive stress at the connection between the tab 5 and the bare battery cell 3 and the connection between the tab 5 and the connecting member 4, thereby improving the reliability of the battery cell.

[0041] As shown in Figure 5As shown, in one optional embodiment, the two edges of the insulating protective member 6 in the width direction of the tab 5 respectively extend beyond the two edges of the tab 5 in the width direction of the tab 5. This edge is a third edge 10. The amount by which the edge of the insulating protective member 6 in the width direction of the tab 5 extends beyond the edge of the tab 5 in the width direction of the tab 5 is L3, where L3 ≥ 5mm. The width direction of the tab 5 is located in the plane where the tab 5 is located and is perpendicular to the extension direction of the tab 5. The increased dimension of the insulating protective member 6 in the width direction of the tab 5 makes it easier to align the insulating protective member 6 with the tab 5 when the insulating protective member 6 is attached to the tab 5, simplifying the assembly process and improving assembly efficiency. The fact that the edge of the insulating protective member 6 in the width direction of the tab 5 extends beyond the edge of the tab 5 in the width direction of the tab 5 helps to ensure the coverage area of ​​the insulating protective member 6 over the tab 5, thereby helping to ensure the protective effect of the insulating protective member 6 on the tab 5.

[0042] like Figure 5 As shown, in one optional embodiment, the tab 5 has a first central axis extending along the tab 5's extension direction, and the insulating protective member 6 has a second central axis extending along the tab 5's extension direction. The projections of the first and second central axes in the thickness direction of the tab 5 coincide, which helps to avoid excessive coverage of one side of the tab 5 by the insulating protective member 6 and insufficient coverage of the other side edge, thus improving the protective effect of the insulating protective member 6 on the tab 5. It is understood that, due to factors such as processing accuracy and dimensional errors, during the actual processing of the battery cell, the projection of the first central axis of the tab 5 in the thickness direction of the tab 5 is difficult to completely coincide with the projection of the second central axis of the insulating protective member 6 in the thickness direction of the tab 5. In this embodiment, the mutual coincidence of the projections of the first and second central axes in the thickness direction of the tab 5 means that, during the actual processing of the battery cell, the projection of the first central axis of the tab 5 in the thickness direction of the tab 5 is difficult to approximately coincide with the projection of the second central axis of the insulating protective member 6 in the thickness direction of the tab 5.

[0043] like Figure 2 and Figure 4 and Figure 6 As shown, in another optional embodiment, a gap 7 is provided between the insulating protective member 6 and the surface of the bent portion of the tab 5 near the arc-shaped region, meaning that at least a portion of the insulating protective member 6 is not in contact with the inner curved surface of the tab 5. The gap 7 between the insulating protective member 6 and the inner curved surface reduces the direct impact of the insulating protective member 6 on the tab 5, reduces the stress exerted by the insulating protective member 6 on the tab 5, and lowers the probability of the insulating protective member 6 tearing the tab 5. Simultaneously, the gap 7 between the insulating protective member 6 and the inner curved surface increases the insulation effect between the insulating protective member 6 and the tab 5, which helps to further reduce the risk of accidental short circuits inside the cell and improves the reliability of the cell. It also reduces the amount of insulating protective member 6 used, lowering product costs.

[0044] The insulation protection piece 6 can be connected with the bare battery cell 3 or the connecting piece 4 by adhesion. Specifically, in a specific optional embodiment, the insulation protection piece 6 has a first adhesive part, a second adhesive part and a gap part between the first adhesive part and the second adhesive part, the first adhesive part is adhered on the bare battery cell 3, the second adhesive part is adhered on the second connecting part 12, and the gap part has a gap 7 between the surface close to the arch area of the bent part of the tab 5. The first adhesive part and the second adhesive part are beneficial to increase the adhesion range of the insulation protection piece 6, and make the connection of the insulation protection piece 6 more reliable. At the same time, when the insulation protection piece 6 is stressed, part of the stress can be transmitted to the bare battery cell 3 and the second connecting part 12 through the first adhesive part and the second adhesive part respectively, so as to reduce the stress of the bent part of the tab 5, which is beneficial to avoid the tab 5 from falling off or separating from the bare battery cell 3 due to excessive stress, and also beneficial to avoid the tab 5 from tearing or breaking at the bent part, thereby improving the reliability of the battery cell.

[0045] In a specific optional embodiment, no adhesive layer is arranged on the gap part, so as to avoid the gap part from being accidentally adhered to the tab 5 and increasing the stress of the insulation protection piece 6 on the tab 5. Specifically, as shown in Figure 6 , the insulation protection piece 6 has a first extension area and a second extension area in the extension direction of the insulation protection piece 6, the first extension area covers the bare battery cell 3, and the second extension area covers the connecting piece 4.

[0046] Specifically, the extension direction of the insulation protection piece 6 can be the direction in which the insulation protection piece 6 extends from the bare battery cell 3 to the connecting piece 4, or the direction in which the insulation protection piece 6 extends from the connecting piece 4 to the bare battery cell 3. The size of the first extension area in the extension direction of the insulation protection piece 6 is Y1, and the size of the second extension area in the extension direction of the tab 5 is Y2, Y1≤10mm, Y2≤10mm. For example, Y1 and Y2 can both be 6mm. The sizes of the first extension area and the second extension area should not be too large, so as to avoid the adhesion area between the insulation protection piece 6 and the bare battery cell 3 or the connecting piece 4 being too small and causing the insulation protection piece 6 to be not firmly adhered. It can be understood that the sizes of the first extension area and the second extension area should not be too small, so as to avoid the insulation protection piece 6 from being accidentally adhered to the tab 5.

[0047] As shown in Figure 3 and Figure 4 , in the present embodiment, the insulation protection piece 6 can be arranged around the tab 5, and at least surrounds the tab 5 for one turn, so as to comprehensively protect the tab 5.

[0048] In summary, the hard shell battery cell of the embodiment, since the insulating protection piece is at least partially supported in the arcuate region formed by the bending of the tab bending portion, when the tab is compressed during the assembly of the battery cell and continues to bend under the pressure, the insulating protection piece can provide support to the bending portion of the tab, reduce the bending amount of the whole tab, help to avoid the tab to continue to bend and insert into the bare battery cell, and improve the safety performance of the battery cell.

[0049] Meanwhile, the number of layers of the tab is N, the thickness of the single layer of the tab is S, and the thickness of the insulating protection piece is H, 0.07(N×S)≤H≤0.1(N×S), so that the thickness of the insulating protection piece is adapted to the number of layers of the number of layers of the tab and the thickness of the single layer of the tab, which is beneficial to avoid the insulating protection piece to be too thick and the strength to be too large, so that the overall strength of the tab is too high and difficult to bend, and further leads to material waste, and is also beneficial to avoid the insulating protection piece to be too thin and the strength to be insufficient, so that the insulating protection piece cannot support the tab at the bending portion of the tab, and the tab is still easy to insert into the bare battery cell and other problems.

[0050] The above embodiments only exemplarily illustrate the principles and effects of the utility model, and are not used to limit the utility model. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the utility model. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the utility model should be covered by the claims of the utility model.

Claims

1. A hard shell battery cell, characterized by: The application relates to a battery cell, comprising: a shell, which comprises a shell body and a cover plate assembly arranged on the shell body; a bare battery cell arranged in the shell, wherein a mounting space is formed between the top of the bare battery cell and the cover plate assembly; a tab arranged in the mounting space, wherein the tab comprises a first connecting part connected with the bare battery cell, a second connecting part connected with the cover plate assembly, and a bending part arranged between the first connecting part and the second connecting part, and the bending part is bent to form an arc region; an insulation protection part at least partially supported in the arc region; wherein the tab has N layers, the thickness of a single layer of the tab is S, the thickness of the insulation protection part is H, and 0.07 (N*S) <= H <= 0.1 (N*S).

2. The hard-shell cell of claim 1, wherein: The surface of the insulation protection part close to the bending part close to the arc region is attached to the surface of the bending part close to the arc region.

3. The hard-shell cell of claim 2, wherein: The tab extends from the bare battery cell to the cover plate assembly, the edge of the tab close to the bare battery cell is a first edge, the edge of the tab close to the cover plate assembly is a second edge, the edge of the insulation protection part exceeds the first edge by an amount L1 in the extension direction of the tab, the edge of the insulation protection part exceeds the second edge by an amount L2 in the extension direction of the tab, L1 >= 5 mm, and L2 >= 5 mm.

4. The hard-shell cell of claim 2, wherein: The tab extends from the bare battery cell to the cover plate assembly, the two edges of the insulation protection part exceed the two edges of the tab in the width direction of the tab, and the edge of the insulation protection part exceeds the edge of the tab in the width direction of the tab by an amount L3, L3 >= 5 mm.

5. The hard-shell battery cell of claim 2, wherein: The tab extends from the bare battery cell to the cover plate assembly, the tab has a first central axis arranged in the extension direction of the tab, the insulation protection part has a second central axis arranged in the extension direction of the tab, and the projections of the first central axis and the second central axis in the thickness direction of the tab coincide with each other.

6. The hard-shell battery cell of claim 1, wherein: The insulation protection part has a gap between the surface of the insulation protection part close to the bending part close to the arc region and the surface of the bending part close to the arc region.

7. The hard-shell cell of claim 6, wherein: The insulation protection part has a first adhesive part, a second adhesive part, and a void part arranged between the first adhesive part and the second adhesive part, the first adhesive part is adhered to the bare battery cell, the second adhesive part is adhered to the second connecting part, and the void part has a gap between the surface of the insulation protection part close to the bending part close to the arc region and the surface of the bending part close to the arc region.

8. The hard-shell cell of claim 7, wherein: The void part is not provided with an adhesive layer, and the void part has a first extension area at least partially covering the bare battery cell and a second extension area at least partially covering the second connecting part.

9. The hard-shell cell of claim 8, wherein: The tab extends from the bare battery cell to the cover plate assembly, the size of the first extension area in the extension direction of the tab is Y1, the size of the second extension area in the extension direction of the tab is Y2, Y1 <= 10 mm, and Y2 <= 10 mm.

10. The hard-shell battery cell of claim 1, wherein: The insulation protection part surrounds the tab and at least surrounds the tab once.

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