Battery

Abstract

The utility model belongs to the technical field of batteries, and particularly relates to a battery which comprises a battery cell, the top cover plate covers the upper end of the battery cell; the top cover plate comprises a plate body and first containing grooves, and the first containing grooves are formed in the four corners of the plate body. The shell wraps the battery cell, and the upper end of the shell is connected with the plate body; the insulating film comprises a film surrounding part, a film turning part and a film folding part, the film surrounding part surrounds the surface of the shell, the film turning part covers the edges and the four corners of the plate body, and the film folding part is formed by overlapping the film turning part at the four corners of the plate body; the top patch is attached to the upper end surfaces of the film turning part, the film folding part and the plate body; wherein the first accommodating groove is configured to accommodate the film stack part. The top cover plate is provided with the first accommodating groove, so that the problem that the top pasters are easy to warp when being pasted at the four corners of the top cover plate is solved, the flatness of the pasted top pasters is realized, the warping phenomenon of the top pasters is effectively avoided, the production reject ratio is effectively reduced, and the battery production quality is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and in particular relates to a battery. Background Art

[0002] Currently, after the square shell batteries in the lithium battery industry are sorted, a layer of insulating film will be applied to the other five surfaces of the battery except the upper surface of the top cover. The upper end of the insulating film is closed to the edge of the top cover, and then a top patch is affixed to the upper surface of the top cover to just press the insulating film at the closing point.

[0003] Because there are multiple layers of insulating film superimposed when the insulating film is closed at the four corners of the top cover plate, the four corners protrude from the upper surface of the top cover plate. When the top patch is pasted at the four corners of the battery top cover plate, the corners of the top patch will be warped, increasing the production defect rate. Utility Model Content

[0004] In order to solve the shortcomings of the existing technology, the present invention provides a battery. By setting a first accommodating groove on the top cover plate, the problem that the top patch is easily warped when pasted on the four corners of the top cover plate is solved, the flatness of the top patch after pasting is achieved, and the warping phenomenon of the top patch is effectively avoided, thereby effectively reducing the production defective rate and ensuring the battery production quality.

[0005] The technical effects to be achieved by the present invention are achieved through the following technical solutions:

[0006] A battery comprises a cell; a top cover plate, which is arranged on the upper end of the cell; the top cover plate comprises a plate body and a first accommodating groove, and the first accommodating groove is arranged at the four corners of the plate body; a shell, which surrounds the cell, and the upper end of the shell is connected to the plate body; an insulating film, which comprises a film surrounding portion, a film folding portion and a film stacking portion, the film surrounding portion surrounds the surface of the shell, the film folding portion covers the edge and four corners of the plate body, and the film stacking portion is formed by overlapping the film folding portion at the four corners of the plate body; and a top patch, which is attached to the film folding portion, the film stacking portion and the upper end surface of the plate body.

[0007] Wherein, the first accommodating groove is configured to accommodate the membrane stack portion.

[0008] In the present invention, the membrane surrounding portion wraps around the surface of the housing, the membrane folding portion covers the edges and four corners of the plate, and the membrane folding portions covering the four corners of the plate are then overlapped to form a membrane stack. The top patch is then attached to the membrane folding portion, the membrane stack, and the plate, thereby pressing the membrane stack into the first receiving groove, reducing the height of the membrane stack protruding from the upper end surface of the plate. This improves the smoothness of the attachment between the top patch and the top cover, effectively preventing the corner warping of the top patch after attachment, thereby reducing the production defect rate, ensuring battery production quality, and effectively avoiding customer complaints.

[0009] Furthermore, in the horizontal direction, the dimensions of the film stack are no larger than the dimensions of the first receiving groove. Preferably, the width of the film stack covering the plate is 3mm-8mm, and the width of the first receiving groove is designed to be 3mm-10mm. This effectively ensures that the film stack is completely accommodated in the first receiving groove in the horizontal direction, further reducing the height of the film stack protruding from the upper end surface of the plate, and even preventing the film stack from protruding from the upper end surface of the plate, thereby improving the smoothness of the bonding between the top patch and the top cover plate, thereby more effectively preventing the corner warping of the top patch after bonding.

[0010] Furthermore, in the vertical direction, the membrane stack has a first thickness, the first accommodating groove has a first depth, and the first thickness is not greater than the first depth. Preferably, the first depth is 0.3-0.5 mm. Through this setting, the first depth can be flexibly set according to the first thickness, with high flexibility, ensuring that the first accommodating groove can completely accommodate the membrane stack in the vertical direction, avoiding the membrane stack from protruding from the upper end face of the plate body, thereby more effectively avoiding the corner warping phenomenon after the top patch is pasted. Preferably, the first thickness is equal to the first depth, so that the upper end face of the membrane stack is flush with the upper end face of the plate body, further improving the pasting flatness between the top patch and the top cover plate, thereby more effectively avoiding the corner warping phenomenon after the top patch is pasted.

[0011] Furthermore, in the vertical direction, the film stack has a first thickness. The upper end surfaces of the four corners of the housing are sunken by a first height relative to the upper end surface of the plate body, and the first thickness is no greater than the first height. The sunken upper end surfaces of the four corners of the housing allow the upper end surfaces at the four corners of the housing to vertically accommodate the film stack, preventing the film stack from protruding from the upper end surface of the plate body, thereby more effectively preventing the corners of the top patch from warping after attachment.

[0012] Furthermore, the top cover plate includes a second receiving groove, which is disposed at the edge of the plate body and communicates with the first receiving groove; the second receiving groove is configured to accommodate the membrane flap. This arrangement allows the membrane flap to be accommodated in the second receiving groove, thereby reducing the height of the membrane flap protruding from the upper end surface of the plate body, or even preventing the membrane flap from protruding from the upper end surface of the plate body. This effectively improves the smoothness of the adhesion between the top patch and the top cover plate, effectively preventing the edge of the top patch from warping after adhesion, and ensuring production quality.

[0013] Furthermore, in the vertical direction, the membrane turning portion has a second thickness, the second receiving groove has a second depth, and the second thickness is not greater than the second depth. Preferably, the second depth is 0.1-0.2 mm.

[0014] Furthermore, in the horizontal direction, the size of the membrane turning portion is not larger than the size of the second accommodating groove. Preferably, the width of the second accommodating groove is 3-10 mm.

[0015] By providing the aforementioned second receiving groove, the second depth and horizontal dimensions of the second receiving groove can be designed based on the second thickness and horizontal dimensions of the membrane flap, effectively and completely accommodating the membrane flap in the second receiving groove both vertically and horizontally, thereby preventing the membrane flap from protruding from the upper end surface of the plate, thereby more effectively preventing the edge warping of the top patch after attachment. Preferably, the second thickness is equal to the second depth, so that the upper end surface of the membrane flap is flush with the upper end surface of the plate, further improving the smoothness of the attachment between the top patch and the top cover plate, thereby more effectively preventing the edge warping of the top patch after attachment.

[0016] Furthermore, in the vertical direction, the membrane flap has a second thickness. The upper end surface of the edge of the housing is sunken by a second height relative to the upper end surface of the plate body, and the second thickness is no greater than the second height. The sunken upper end surface of the edge of the housing allows the upper end surface of the edge of the housing to vertically accommodate the membrane flap, preventing the membrane flap from protruding from the upper end surface of the plate body, thereby more effectively preventing the edge from warping after the top patch is attached.

[0017] Furthermore, the membrane stack is formed by overlapping two layers of membrane turnover portions, and the first receiving groove is horizontally rectangular. When the membrane stack is formed by overlapping two layers of membrane turnover portions, the membrane stack is horizontally rectangular, and the shape of the first receiving groove can be set to a rectangular shape that matches the shape of the membrane stack.

[0018] Furthermore, the membrane stack is formed by overlapping three layers of membrane turnover portions, and the first receiving groove has a triangular shape in the horizontal direction. When the membrane stack is formed by overlapping three layers of membrane turnover portions, the membrane stack has a triangular shape in the horizontal direction, and the shape of the first receiving groove can be set to a triangular shape that matches the shape of the membrane stack.

[0019] Through the shape setting of the above-mentioned first accommodating groove, the membrane stack will have different shapes due to the different folding methods of the membrane folding part, and the first accommodating groove is flexibly designed to have a corresponding shape according to the shape of the membrane stack, ensuring that the first accommodating groove can accommodate membrane stacks of different shapes.

[0020] To sum up, the present invention has at least the following benefits: a first accommodating groove is provided on the top cover plate, and the membrane stack is accommodated in the first accommodating groove, thereby reducing the height of the membrane stack protruding from the upper end surface of the plate body, and even avoiding the membrane stack protruding from the upper end surface of the plate body, thereby solving the problem that the top patch is prone to warping when it is pasted on the four corners of the top cover plate, achieving the flatness of the top patch after pasting, effectively avoiding the warping phenomenon of the top patch, reducing the production defect rate, and ensuring the quality of battery production. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A top view of the battery of Example 1 of the present utility model (excluding the top patch);

[0022] Figure 2 for Figure 1 Middle AA cross-sectional view (including top patch);

[0023] Figure 3 for Figure 2 A schematic diagram of the enlarged structure of the middle B part;

[0024] Figure 4 This is a top view of the top cover plate in Example 1 of the present utility model;

[0025] Figure 5 This is a side view of the top cover plate in Example 1 of the present utility model;

[0026] Figure 6 This is a schematic diagram of the state of the first containing groove containing the film stack in Example 1 of the present utility model;

[0027] Figure 7 This is a top view of the top cover plate in Example 2 of the present utility model;

[0028] Figure 8 This is a side view of the top cover plate in Example 2 of the present utility model;

[0029] Figure 9 This is a schematic diagram of the state of the second containing groove accommodating the membrane turning portion in Example 2 of the present utility model;

[0030] Figure 10 A top view of the battery of Example 3 of the present utility model (excluding the top patch);

[0031] Figure 11 This is a top view of the top cover plate in Example 3 of the present utility model.

[0032] Markings in the figure: 1. battery cell; 2. top cover plate, 21. plate body, 22. first accommodating groove, H1, first depth, 23. second accommodating groove, H2, second depth; 3. shell; 4. insulating film, 41. film surrounding part, 42. film folding part, T2, second thickness, 43. film stacking part, T1, first thickness; 5. top patch. DETAILED DESCRIPTION

[0033] To make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0034] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0035] Example 1

[0036] Please see the attached Figure 1 -Attached Figure 5 A battery of the present invention includes a battery cell 1; a top cover plate 2, which is covered on the upper end of the battery cell 1; the top cover plate 2 includes a plate body 21 and a first accommodating groove 22, and the first accommodating groove 22 is arranged at the four corners of the plate body 21; a shell 3, which surrounds the battery cell 1, and the upper end of the shell 3 is connected to the plate body 21; an insulating film 4, which includes a film surrounding portion 41, a film turning portion 42 and a film stacking portion 43, the film surrounding portion 41 surrounds the surface of the shell 3, the film turning portion 42 covers the edge and four corners of the plate body 21, and the film stacking portion 43 is formed by overlapping the film turning portion 42 at the four corners of the plate body 21; and a top patch 5, which is attached to the film turning portion 42, the film stacking portion 43 and the upper end surface of the plate body 21.

[0037] The first receiving groove 22 is configured to accommodate a film stack 43. Preferably, the film stack 43 is adhered to the bottom surface of the first receiving groove 22. Specifically, at the four corners of the plate 21, the first film flip 42 is adhered to the bottom surface of the first receiving groove 22, the second film flip 42 is adhered to the first film flip 42, and so on, overlapping to form the film stack 43. Preferably, the housing 3 is an aluminum shell.

[0038] In this embodiment, the membrane surrounding portion 41 is wrapped around the surface of the housing 3, and the membrane turning portion 42 covers the edges and four corners of the plate body 21. The membrane turning portion 42 covering the four corners of the plate body 21 is then overlapped to form a membrane stacking portion 43. The top patch 5 is then adhered to the membrane turning portion 42, the membrane stacking portion 43, and the plate body 21, thereby pressing the membrane stacking portion 43 into the first receiving groove 22, reducing the height of the membrane stacking portion 43 protruding from the upper end surface of the plate body 21, thereby improving the smoothness of the adhesion between the top patch 5 and the top cover plate 2, effectively preventing the corner warping of the top patch 5 after adhesion, thereby reducing the production defect rate, ensuring battery production quality, and effectively avoiding customer complaints.

[0039] In one embodiment, the size of the film stack 43 in the horizontal direction is no larger than the size of the first receiving groove 22. Preferably, the width of the film fold 42 covering the plate 21 is 3mm-8mm, and the width of the first receiving groove 22 is designed to be 3mm-10mm. This effectively ensures that the film stack 43 is completely accommodated in the first receiving groove 22 in the horizontal direction, further reduces the height of the film stack 43 protruding from the upper end surface of the plate 21, and even prevents the film stack 43 from protruding from the upper end surface of the plate 21, thereby improving the smoothness of the bonding between the top patch 5 and the top cover plate 2, thereby more effectively preventing the corner warping of the top patch 5 after bonding.

[0040] Please see the attached Figure 6 , in the vertical direction, the membrane stack 43 has a first thickness T1, the first accommodating groove 22 has a first depth H1, and the first thickness T1 is not greater than the first depth H1. Preferably, the first depth H1 is 0.3-0.5mm. Through this setting, the first depth H1 can be flexibly set according to the first thickness T1, with high flexibility, ensuring that the first accommodating groove 22 can completely accommodate the membrane stack 43 in the vertical direction, avoiding the membrane stack 43 from protruding from the upper end surface of the plate body 21, thereby more effectively avoiding the corner warping phenomenon after the top patch 5 is pasted. Preferably, the first thickness T1 is equal to the first depth H1, so that the upper end surface of the membrane stack 43 is flush with the upper end surface of the plate body 21, further improving the pasting flatness between the top patch 5 and the top cover plate 2, thereby more effectively avoiding the corner warping phenomenon after the top patch 5 is pasted.

[0041] In one embodiment, in the vertical direction, the membrane stack 43 has a first thickness T1, and the upper end surface of the shell 3 at the four corners is sunken by a first height compared to the upper end surface of the plate body 21, and the first thickness T1 is not greater than the first height. Preferably, the first height is 0.3mm-0.5mm. The upper end surface at the four corners of the shell 3 is sunken so that the upper end surface at the four corners of the shell 3 can accommodate the membrane stack 43 in the vertical direction, avoiding the membrane stack 43 from protruding from the upper end surface of the plate body 21, thereby more effectively avoiding the corner warping phenomenon after the top patch 5 is pasted. Preferably, the first height is equal to the first depth H1, so that the upper end surface at the four corners of the shell 3 is flush with the bottom surface of the first accommodating groove 22, improving the pasting smoothness between the membrane stack 43 and the first accommodating groove 22, and further improving the pasting smoothness between the top patch 5 and the top cover plate 2, thereby more effectively avoiding the corner warping phenomenon after the top patch 5 is pasted.

[0042] In one embodiment, the membrane stack 43 is formed by overlapping two membrane flips 42, and the first receiving groove 22 is horizontally rectangular. When the membrane stack 43 is formed by overlapping two membrane flips 42, if the membrane stack 43 is horizontally rectangular, the first receiving groove 22 can be configured to be rectangular to match the shape of the membrane stack 43.

[0043] Through the shape setting of the above-mentioned first accommodating groove 22, due to the different folding methods of the membrane folding portion 42, the membrane stack portion 43 will have different shapes, and the first accommodating groove 22 is flexibly designed to have a corresponding shape according to the shape of the membrane stack portion 43, ensuring that the first accommodating groove 22 can accommodate membrane stack portions 43 of different shapes.

[0044] Example 2

[0045] The difference from Example 1 is: Figure 7 -Attached Figure 8 , the top cover plate 2 also includes a second accommodating groove 23, which is arranged at the edge of the plate body 21, and the second accommodating groove 23 is connected to the first accommodating groove 22; the second accommodating groove 23 is configured to accommodate the film turning portion 42. Preferably, the film turning portion 42 is adhered to the bottom surface of the second accommodating groove 23. Through this arrangement, the film turning portion 42 is accommodated in the second accommodating groove 23, thereby reducing the height of the film turning portion 42 protruding from the upper end surface of the plate body 21, and even avoiding the film turning portion 42 protruding from the upper end surface of the plate body 21. The setting of the second accommodating groove 23 can effectively improve the smoothness of the adhesion between the top patch 5 and the top cover plate 2, effectively avoid the edge warping phenomenon of the top patch 5 after adhesion, and ensure production quality.

[0046] Please see the attached Figure 9 In the vertical direction, the membrane turning portion 42 has a second thickness T2, and the second receiving groove 23 has a second depth H2. The second thickness T2 is not greater than the second depth H2. Preferably, the second depth H2 is 0.1 mm to 0.2 mm.

[0047] In one embodiment, in the horizontal direction, the size of the membrane turning portion 42 is not larger than the size of the second receiving groove 23. Preferably, the width of the second receiving groove 23 is 3-10 mm.

[0048] By configuring the second receiving groove 23 as described above, the second depth H2 and horizontal dimensions of the second receiving groove 23 can be designed based on the second thickness T2 and horizontal dimensions of the membrane flip portion 42, effectively and completely accommodating the membrane flip portion 42 in the vertical and horizontal directions within the second receiving groove 23. This prevents the membrane flip portion 42 from protruding from the upper end surface of the plate body 21, thereby more effectively preventing the edge of the top patch 5 from warping after attachment. Preferably, the second thickness T2 is equal to the second depth H2, so that the upper end surface of the membrane flip portion 42 is flush with the upper end surface of the plate body 21, further improving the smoothness of the attachment between the top patch 5 and the top cover plate 2, thereby more effectively preventing the edge of the top patch 5 from warping after attachment.

[0049] In one embodiment, in the vertical direction, the membrane flip portion 42 has a second thickness T2, and the upper end surface of the edge of the shell 3 is sunken by a second height compared to the upper end surface of the plate body 21, and the second thickness T2 is not greater than the second height. Preferably, the second height is 0.1mm-0.2mm. The upper end surface of the edge of the shell 3 is sunken so that the upper end surface of the edge of the shell 3 can accommodate the membrane flip portion 42 in the vertical direction, avoiding the membrane flip portion 42 from protruding from the upper end surface of the plate body 21, thereby more effectively avoiding the edge warping phenomenon after the top patch 5 is pasted. Preferably, the second height is equal to the second depth H2, so that the upper end surface of the edge of the shell 3 is flush with the bottom surface of the second accommodating groove 23, improving the pasting smoothness between the membrane flip portion 42 and the second accommodating groove 23, further improving the pasting smoothness between the top patch 5 and the top cover plate 2, thereby more effectively avoiding the edge warping phenomenon after the top patch 5 is pasted.

[0050] Example 3

[0051] The difference from Example 2 is: Figure 10 -Attached Figure 11 The membrane stack 43 is formed by overlapping three membrane turnovers 42, and the shape of the first receiving groove 22 in the horizontal direction is triangular. When the membrane stack 43 is formed by overlapping three membrane turnovers 42, the shape of the membrane stack 43 in the horizontal direction can be triangular. When the shape of the membrane stack 43 is triangular, the shape of the first receiving groove 22 can be set to a triangle that matches the shape of the membrane stack 43. Through the above-mentioned shape setting of the first receiving groove 22, due to different folding methods of the membrane turnover 42, the membrane stack 43 will have different shapes, and the first receiving groove 22 can be flexibly designed to correspond to the shape of the membrane stack 43, ensuring that the first receiving groove 22 can accommodate membrane stacks 43 of different shapes.

[0052] In summary, the present invention has at least the following benefits: by providing the first accommodating groove 22 on the top cover plate 2, the problem of the top patch 5 being easily warped when pasted on the four corners of the top cover plate 2 is solved, the flatness of the top patch 5 after pasting is achieved, the warping phenomenon of the top patch 5 is effectively avoided, the production defect rate is reduced, and the battery production quality is guaranteed.

[0053] In the description of the present invention, it should be understood that the terms indicating orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0054] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0055] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is typically placed when in use. These terms are intended solely to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0056] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0057] In the present invention, unless otherwise expressly specified or limited, a first feature being above or below a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being above, above, and above the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being below, below, and below the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0058] Although the present invention has been described with reference to the above specific embodiments, it is obvious that those skilled in the art can make many substitutions, modifications and variations based on the above content. Therefore, all such substitutions, modifications and variations are included within the spirit and scope of the appended claims.

Claims

1. A battery, characterized in that: include: Battery cell (1); A top cover plate (2) is provided on the upper end of the battery core (1); the top cover plate (2) comprises a plate body (21) and a first accommodating groove (22), wherein the first accommodating groove (22) is provided at the four corners of the plate body (21); A shell (3) surrounds the battery core (1), and the upper end of the shell (3) is connected to the plate (21); An insulating film (4) comprising a film surrounding portion (41), a film turning portion (42) and a film stacking portion (43), wherein the film surrounding portion (41) surrounds the surface of the housing (3), the film turning portion (42) covers the edge and four corners of the plate body (21), and the film stacking portion (43) is formed by overlapping the film turning portion (42) at the four corners of the plate body (21); and A top patch (5) is attached to the membrane turning portion (42), the membrane stacking portion (43) and the upper end surface of the plate body (21); Wherein, the first accommodating groove (22) is configured to accommodate the membrane stack portion (43).

2. A battery according to claim 1, characterized in that: In the horizontal direction, the size of the membrane stack portion (43) is not larger than the size of the first accommodating groove (22).

3. A battery according to claim 1, characterized in that: In the vertical direction, the film stack portion (43) has a first thickness, the first accommodating groove (22) has a first depth, and the first thickness is not greater than the first depth.

4. A battery according to claim 1, characterized in that: In the vertical direction, the membrane stack portion (43) has a first thickness. Compared with the upper end surface of the plate body (21), the upper end surfaces at the four corners of the shell (3) are sunken by a first height, and the first thickness is not greater than the first height.

5. A battery according to claim 1, characterized in that: The top cover plate (2) further includes a second accommodating groove (23), which is arranged at the edge of the plate body (21), and the second accommodating groove (23) is connected to the first accommodating groove (22); the second accommodating groove (23) is configured to accommodate the membrane turning portion (42).

6. A battery according to claim 5, characterized in that: In the vertical direction, the membrane turning portion (42) has a second thickness, the second accommodating groove (23) has a second depth, and the second thickness is not greater than the second depth.

7. A battery according to claim 5, characterized in that: In the horizontal direction, the size of the membrane turning portion (42) is not larger than the size of the second accommodating groove (23).

8. A battery according to claim 5, characterized in that: In the vertical direction, the membrane folding portion (42) has a second thickness, and compared with the upper end surface of the plate body (21), the upper end surface of the edge of the shell (3) is sunken by a second height, and the second thickness is not greater than the second height.

9. A battery according to any one of claims 1 to 8, characterized in that: The membrane stacking portion (43) is formed by overlapping two layers of the membrane turning portions (42). In the horizontal direction, the shape of the first accommodating groove (22) is rectangular.

10. A battery according to any one of claims 1 to 8, characterized in that: The membrane stack portion (43) is formed by overlapping three layers of the membrane turnover portion (42), and in the horizontal direction, the shape of the first accommodating groove (22) is a triangle.

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