Cover plate structure and battery

Abstract

The utility model relates to the technical field of batteries, and discloses a cover plate structure and a battery, the cover plate structure comprises: a plate body, which is provided with an anti-explosion valve hole; an anti-explosion valve mounting sinking table and a sealing ring mounting sinking table are sequentially formed on the circumferential edge of the anti-explosion valve hole, and the anti-explosion valve mounting sinking table is arranged on the side, close to the outer surface of the plate body, relative to the sealing ring mounting sinking table; the anti-explosion valve is arranged on the anti-explosion valve mounting sinking table; the sealing ring is arranged on the sealing ring mounting sinking table, and the sealing ring abuts against the position between the anti-explosion valve and the plate body; and the circumferential edge of the anti-explosion valve is welded and connected with the plate body to form a welding mark. According to the cover plate structure, it can be guaranteed that the sealing ring abuts against the position between the anti-explosion valve and the plate body, so that an assembly gap between the anti-explosion valve and the plate body is blocked, and even if welding defects exist in the anti-explosion valve and the plate body, liquid leakage can be prevented due to the existence of the sealing ring.

Description

Technical Field

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

[0002] The battery cover is a key component in the battery. Its function is to weld with the shell to form a sealed cavity and to lead out the positive and negative electrodes of the electrode group. The plain aluminum sheet of the cover is provided with an opening for installing the explosion-proof valve. The plain aluminum sheet and the explosion-proof valve are connected by welding.

[0003] However, in the related art, due to processing errors and other reasons, defects such as welding explosion points are prone to occur after the bare aluminum sheet and the explosion-proof valve are welded, resulting in poor sealing. After the battery is assembled, air or liquid leakage will occur, the yield is low and there are certain safety hazards. Utility Model Content

[0004] In view of this, the utility model provides a cover plate structure and a battery to solve the problem that the battery is prone to gas or liquid leakage due to welding defects of bare aluminum sheets and explosion-proof valves.

[0005] In a first aspect, the utility model provides a cover plate structure, comprising:

[0006] The plate body is provided with an explosion-proof valve hole; the circumferential edge of the explosion-proof valve hole is formed with an explosion-proof valve mounting sink and a sealing ring mounting sink in sequence, wherein the explosion-proof valve mounting sink is arranged on a side close to the outer surface of the plate body relative to the sealing ring mounting sink;

[0007] An explosion-proof valve is installed on the explosion-proof valve installation sink;

[0008] The sealing ring is arranged on the sealing ring installation sink, and the sealing ring is tightly pressed between the explosion-proof valve and the plate body;

[0009] The circumferential edge of the explosion-proof valve is connected to the plate body by welding to form a weld mark.

[0010] Beneficial effect: The cover plate structure provided by the embodiment of the utility model has an explosion-proof valve installation sink and a sealing ring installation sink formed in sequence on the circumferential edge of the explosion-proof valve hole. The explosion-proof valve installation sink is arranged on the side close to the outer surface of the plate body relative to the sealing ring installation sink; and the explosion-proof valve is arranged on the explosion-proof valve installation sink; and the sealing ring is arranged on the sealing ring installation sink. After the explosion-proof valve is welded to the plate body, it can be ensured that the sealing ring is tightly pressed between the explosion-proof valve and the plate body, thereby blocking the assembly gap between the explosion-proof valve and the plate body. Even if there are welding defects between the explosion-proof valve and the plate body, the presence of the sealing ring can prevent leakage. The double sealing form of welding sealing and sealing ring sealing is adopted to improve the sealing performance of the explosion-proof valve and reduce the risk of leakage caused by welding defects of the explosion-proof valve in the battery cell manufacturing process.

[0011] In an optional implementation, in a direction perpendicular to the plane where the plate body is located, the projection of the sealing ring installation sink falls within the projection range of the explosion-proof valve installation sink.

[0012] Beneficial effect: in the direction perpendicular to the plane where the plate body is located, by making the projection of the sealing ring installation sink fall within the projection range of the explosion-proof valve installation sink, on the one hand, it can ensure the smooth assembly of the sealing ring and avoid interference with the explosion-proof valve installation sink; on the other hand, it can make the sealing ring installation sink and the explosion-proof valve installation sink form staggered layers, which is convenient for separately assembling the sealing ring and the explosion-proof valve to avoid incorrect installation.

[0013] In an optional embodiment, in a direction perpendicular to the plane where the plate body is located, the explosion-proof valve is arranged flush with the outer surface of the plate body, or the explosion-proof valve is arranged recessed relative to the outer surface of the plate body.

[0014] Beneficial effect: The explosion-proof valve is prevented from being protruded relative to the outer surface of the plate body, and the explosion-proof valve is prevented from interfering with the pole group, thereby ensuring the assembly accuracy of the pole group.

[0015] In an optional implementation, the material of the sealing ring includes: fluororubber, nitrile rubber or EPDM rubber.

[0016] Beneficial effect: By adopting the above materials, the elasticity of the sealing ring can be guaranteed, so that after the sealing ring is pressed between the explosion-proof valve and the plate body, it can be in a compressed state, thereby improving the sealing effect.

[0017] In an optional implementation, the elastic modulus E of the sealing ring is in the range of 0.1 MPa≤E≤10 MPa.

[0018] In an optional embodiment, the explosion-proof valve includes a main body portion, and a step portion arranged around the circumferential edge of the main body portion, and the step portion is suitable for being embedded in the explosion-proof valve mounting sink;

[0019] The sealing ring abuts against the step portion.

[0020] Beneficial effect: by making the sealing ring abut against the step portion, while ensuring good contact between the explosion-proof valve and the sealing ring, it is possible to avoid the sealing ring interfering with the main body of the explosion-proof valve and avoiding affecting the smooth opening of the explosion-proof valve.

[0021] In an optional embodiment, the sealing ring includes a sealing body, and the sealing body has a first positioning portion protruding toward a side away from the explosion-proof valve;

[0022] The sealing ring installation sink is provided with a first positioning groove corresponding to the first positioning portion, and the first positioning portion is suitable for being embedded in the first positioning groove.

[0023] Beneficial effect: by providing a first positioning portion protruding from the sealing body toward the side away from the explosion-proof valve, a first positioning groove is provided on the sealing ring installation sink corresponding to the first positioning portion, so that the first positioning portion is embedded in the first positioning groove, which can facilitate the positioning of the sealing ring and the plate body, ensure the accurate assembly position of the sealing ring, and ensure that the sealing ring will not be accidentally touched and misaligned during the subsequent installation of the explosion-proof valve into the explosion-proof valve installation sink, thereby improving the assembly yield.

[0024] In an optional embodiment, the sealing ring includes a sealing body, and the sealing body has a second positioning portion protruding toward a side close to the explosion-proof valve;

[0025] The step portion is provided with a second positioning groove corresponding to the second positioning portion, and the second positioning portion is suitable for being embedded in the second positioning groove.

[0026] Beneficial effect: by providing a second positioning portion protruding from the sealing body toward the side close to the explosion-proof valve, a second positioning groove is provided on the step portion corresponding to the second positioning portion, so that the second positioning portion is embedded in the second positioning groove, which can facilitate the positioning of the sealing ring and the explosion-proof valve, ensure the accurate assembly position of the sealing ring, and improve the assembly accuracy of the sealing ring and the explosion-proof valve.

[0027] In an optional embodiment, in a direction parallel to the plane of the plate body and from the edge of the explosion-proof valve hole toward the center, the width of the sealing ring is defined as M, the width of the step portion is defined as N, and the following conditions are satisfied: 0.8≤M / N≤1.2.

[0028] Beneficial effect: By limiting the upper limit of the ratio of the width M of the sealing ring to the width N of the step portion, it is possible to avoid the interference of the explosion-proof valve installation sink with the assembly of the sealing ring when the size of the sealing ring is too large, and at the same time, it is possible to avoid the high-temperature burning of the sealing ring during the welding process of the explosion-proof valve and the plate body when the projection of the sealing ring and the weld mark overlap. By limiting the lower limit of the ratio of the width M of the sealing ring to the width N of the step portion, it is possible to avoid the poor sealing effect caused by the small size of the sealing ring.

[0029] In a second aspect, the utility model further provides a battery, comprising: a shell, and a cover plate structure as described above fixedly connected to the shell.

[0030] Since the battery includes a cover plate structure, it has the same effect as the cover plate structure and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 It is a top view of the board body of the utility model;

[0033] Figure 2 for Figure 1 Schematic diagram of the AA section;

[0034] Figure 3 It is a top view of the cover plate structure of the utility model;

[0035] Figure 4 for Figure 2 A partial enlarged view of the middle BB section;

[0036] Figure 5 It is a schematic diagram of another sealing ring of the utility model;

[0037] Figure 6 It is an exploded schematic diagram of the cover plate structure of the utility model.

[0038] Description of reference numerals:

[0039] 1. Plate body; 11. Explosion-proof valve hole; 12. Explosion-proof valve installation sink; 13. Sealing ring installation sink;

[0040] 2. Explosion-proof valve; 21. Step portion; 22. Main body; 23. Notch;

[0041] 3. Sealing ring; 31. Sealing body; 32. First positioning part; 33. Second positioning part;

[0042] 4. Protective sheet; 5. Welding mark. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0044] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0045] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0047] Combine the following Figures 1 to 6 , describing an embodiment of the utility model.

[0048] According to an embodiment of the present utility model, on the one hand, a cover plate structure is provided, comprising:

[0049] The plate body 1 is provided with an explosion-proof valve hole 11; the circumferential edge of the explosion-proof valve hole 11 is formed with an explosion-proof valve mounting sink 12 and a sealing ring mounting sink 13 in sequence, wherein the explosion-proof valve mounting sink 12 is arranged on one side close to the outer surface of the plate body 1 relative to the sealing ring mounting sink 13;

[0050] An explosion-proof valve 2 is arranged on an explosion-proof valve installation sink 12;

[0051] The sealing ring 3 is arranged on the sealing ring installation sink 13, and the sealing ring 3 is pressed tightly between the explosion-proof valve 2 and the plate body 1;

[0052] The circumferential edge of the explosion-proof valve 2 is welded to the plate body 1 to form a weld mark 5 .

[0053] The cover plate structure of this embodiment is applied to the battery and is specifically assembled with the shell. The shell has an opening. After the cover plate structure and the shell are assembled, they can be enclosed to form a receiving cavity, and the receiving cavity is suitable for placing the electrode group.

[0054] After the cover plate structure is assembled with the shell, it needs to have good sealing to ensure that the electrolyte in the accommodating cavity does not leak out. The cover plate structure includes a plate body 1, on which an explosion-proof valve 2 is installed. The explosion-proof valve 2 and the plate body 1 are connected by welding. When welding defects occur, it is easy to cause poor sealing, resulting in a leak at the welding position of the explosion-proof valve 2 and the plate body 1.

[0055] The cover plate structure provided by the embodiment of the utility model is formed with an explosion-proof valve installation sink 12 and a sealing ring installation sink 13 in sequence on the circumferential edge of the explosion-proof valve hole 11, and the explosion-proof valve installation sink 12 is arranged on the side close to the outer surface of the plate body 1 relative to the sealing ring installation sink 13; and the explosion-proof valve 2 is arranged on the explosion-proof valve installation sink 12; and the sealing ring 3 is arranged on the sealing ring installation sink 13. After the explosion-proof valve 2 is welded to the plate body 1, it can ensure that the sealing ring 3 is tightly pressed between the explosion-proof valve 2 and the plate body 1, so as to block the assembly gap between the explosion-proof valve 2 and the plate body 1. Even if there are welding defects between the explosion-proof valve 2 and the plate body 1, the existence of the sealing ring 3 can prevent leakage. The double sealing form of welding sealing and sealing ring sealing is adopted to improve the sealing performance of the explosion-proof valve and reduce the risk of leakage caused by welding defects of the explosion-proof valve in the battery cell manufacturing process.

[0056] The explosion-proof valve installation sink 12 and the sealing ring installation sink 13 are respectively used to accommodate the explosion-proof valve 2 and the sealing ring 3. In this embodiment, the explosion-proof valve installation sink 12 and the sealing ring installation sink 13 are connected in sequence, and the explosion-proof valve installation sink 12 is arranged on a side close to the outer surface of the plate body 1 relative to the sealing ring installation sink 13, so as to facilitate the sealing ring 3 to be sealed between the explosion-proof valve 2 and the plate body 1, and can ensure the smooth welding of the explosion-proof valve 2 and the plate body 1 to avoid interference.

[0057] During assembly, the sealing ring 3 is first installed into the sealing ring installation sink 13, and then the explosion-proof valve 2 is installed into the explosion-proof valve installation sink 12, and then the circumferential edge of the explosion-proof valve 2 is welded to the plate body 1, so as to realize the assembly of the sealing ring 3 and the explosion-proof valve 2.

[0058] The sealing ring 3 does not need to be specially fixed, and the positioning of the sealing ring 3 can be ensured only by the squeezing force between the explosion-proof valve 2 and the plate body 1.

[0059] Optionally, the sealing ring 3 and the sealing ring mounting sink 13 are interference fit to ensure the sealing effect.

[0060] In order to prevent the sealing ring 3 from being burned by high temperature during the welding process between the explosion-proof valve 2 and the plate body 1, in this embodiment, in the direction perpendicular to the plane where the plate body 1 is located, the projection of the weld mark 5 does not overlap with the sealing ring 3, thereby preventing the sealing ring 3 from being damaged during the welding process and ensuring the sealing effect.

[0061] In this embodiment, the weld mark 5 is arranged around the circumferential edge of the explosion-proof valve 2, so as to ensure the connection reliability between the explosion-proof valve 2 and the plate body 1 and ensure the sealing effect between the explosion-proof valve 2 and the plate body 1.

[0062] In this embodiment, after the explosion-proof valve 2 is placed on the explosion-proof valve installation sink 12, it is preferably ensured that the circumferential edge of the explosion-proof valve 2 is flush with the outer surface of the plate body 1, so that the extrusion pressure of the explosion-proof valve 2 on the sealing ring 3 is more balanced, ensuring the sealing effect of each area.

[0063] In some embodiments, in combination Figure 2 As shown, in the direction perpendicular to the plane where the plate body 1 is located, the projection of the sealing ring installation sink 13 falls within the projection range of the explosion-proof valve installation sink 12.

[0064] In the direction perpendicular to the plane of the plate body 1, by making the projection of the sealing ring installation sink 13 fall within the projection range of the explosion-proof valve installation sink 12, on the one hand, it can ensure the smooth assembly of the sealing ring 3 and avoid interference with the explosion-proof valve installation sink 12; on the other hand, the sealing ring installation sink 13 and the explosion-proof valve installation sink 12 can be staggered, which is convenient for assembling the sealing ring 3 and the explosion-proof valve 2 separately to avoid incorrect installation.

[0065] In some embodiments, in combination Figure 4 As shown, in a direction perpendicular to the plane where the plate body 1 is located, the explosion-proof valve 2 is flush with the outer surface of the plate body 1 , or the explosion-proof valve 2 is recessed relative to the outer surface of the plate body 1 .

[0066] This prevents the explosion-proof valve 2 from being protruded relative to the outer surface of the plate body 1 , prevents the explosion-proof valve 2 from interfering with the electrode group, and ensures the assembly accuracy of the electrode group.

[0067] In some embodiments, the material of the sealing ring 3 includes: fluororubber, nitrile rubber or EPDM rubber.

[0068] By adopting the above materials, the elasticity of the sealing ring 3 can be ensured, so that after the sealing ring 3 is pressed between the explosion-proof valve 2 and the plate body 1, it can be in a compressed state, thereby improving the sealing effect.

[0069] In some embodiments, the elastic modulus E of the sealing ring 3 is in the range of 0.1 MPa≤E≤10 MPa.

[0070] In some embodiments, in combination Figure 4 As shown, the explosion-proof valve 2 includes a main body 22 and a step portion 21 arranged around the circumferential edge of the main body 22, and the step portion 21 is suitable for being embedded in the explosion-proof valve mounting sink 12;

[0071] The seal ring 3 abuts against the step portion 21 .

[0072] The main body 22 is formed with a notch 23 around the step 21 , so that the explosion-proof valve 2 can explode along the notch 23 to release pressure when the pressure exceeds a preset value.

[0073] By making the sealing ring 3 abut against the step portion 21 , the sealing ring 3 can be prevented from interfering with the main body 22 of the explosion-proof valve 2 while ensuring good contact between the explosion-proof valve 2 and the sealing ring 3 , thereby preventing the explosion-proof valve 2 from being affected smoothly.

[0074] In some embodiments, in combination Figure 5 As shown, the sealing ring 3 includes a sealing body 31, and the sealing body 31 has a first positioning portion 32 protruding toward a side away from the explosion-proof valve 2;

[0075] The sealing ring installation sink 13 is provided with a first positioning groove corresponding to the first positioning portion 32 , and the first positioning portion 32 is suitable for being embedded in the first positioning groove.

[0076] By providing a first positioning portion 32 that is raised on the sealing body 31 toward the side away from the explosion-proof valve 2, the sealing ring mounting sink 13 is provided with a first positioning groove corresponding to the first positioning portion 32, so that the first positioning portion 32 is embedded in the first positioning groove, which can facilitate the positioning of the sealing ring 3 and the plate body 1, ensure the accurate assembly position of the sealing ring 3, and ensure that the sealing ring 3 will not be accidentally touched and misaligned during the subsequent installation of the explosion-proof valve 2 into the explosion-proof valve mounting sink 12, thereby improving the assembly yield.

[0077] In some embodiments, in combination Figure 5 As shown, the sealing ring 3 includes a sealing body 31, and the sealing body 31 has a second positioning portion 33 protruding toward a side close to the explosion-proof valve 2;

[0078] The step portion 21 defines a second positioning groove corresponding to the second positioning portion 33 , and the second positioning portion 33 is suitable for being embedded in the second positioning groove.

[0079] By providing a second positioning portion 33 that is raised on the sealing body 31 toward the side close to the explosion-proof valve 2, a second positioning groove is opened on the step portion 21 corresponding to the second positioning portion 33, so that the second positioning portion 33 is embedded in the second positioning groove, which can facilitate the positioning of the sealing ring 3 and the explosion-proof valve 2, ensure the accurate assembly position of the sealing ring 3, and improve the assembly accuracy of the sealing ring 3 and the explosion-proof valve 2.

[0080] In some embodiments, in combination Figure 5 As shown, in a direction parallel to the plane where the plate body 1 is located and from the edge of the explosion-proof valve hole 11 toward the center, the width of the sealing ring 3 is defined as M, the width of the step portion 21 is defined as N, and the following conditions are satisfied: 0.8≤M / N≤1.2.

[0081] By limiting the upper limit of the ratio of the width M of the sealing ring 3 to the width N of the step portion 21, it is possible to avoid the situation where the explosion-proof valve installation sink 12 interferes with the assembly of the sealing ring 3 when the size of the sealing ring 3 is too large, and at the same time, it is possible to avoid the situation where the welding process of the explosion-proof valve 2 and the plate body 1 causes high-temperature burning to the sealing ring 3 when the projection of the sealing ring 3 and the welding mark 5 overlap. By limiting the lower limit of the ratio of the width M of the sealing ring 3 to the width N of the step portion 21, it is possible to avoid the situation where the sealing ring 3 is too small and causes a poor sealing effect.

[0082] Optionally, a protective sheet 4 is attached to the plate body 1 , and the protective sheet 4 is suitable for at least partially covering the explosion-proof valve 2 to prevent impurities or corrosive liquids from dripping onto the explosion-proof valve 2 .

[0083] According to an embodiment of the present utility model, on the other hand, a battery is provided, including: a shell, and a cover plate structure as described above fixedly connected to the shell.

[0084] Obviously, the above embodiments are only examples for clear explanation, and are not intended to limit the implementation methods. Although the embodiments of the present utility model are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present utility model, and such modifications and variations are all within the scope defined by the present utility model.

Claims

1. A cover plate structure, characterized in that: include: A plate body (1) is provided with an explosion-proof valve hole (11); an explosion-proof valve mounting sink (12) and a sealing ring mounting sink (13) are sequentially formed on the circumferential edge of the explosion-proof valve hole (11), wherein the explosion-proof valve mounting sink (12) is arranged on a side close to the outer surface of the plate body (1) relative to the sealing ring mounting sink (13); An explosion-proof valve (2) is arranged on the explosion-proof valve mounting sink (12); A sealing ring (3) is arranged on the sealing ring installation sink (13), and the sealing ring (3) is tightly pressed between the explosion-proof valve (2) and the plate body (1); The circumferential edge of the explosion-proof valve (2) is welded to the plate body (1) to form a weld mark (5).

2. The cover plate structure according to claim 1, characterized in that: In a direction perpendicular to the plane where the plate body (1) is located, the projection of the sealing ring mounting sink (13) falls within the projection range of the explosion-proof valve mounting sink (12).

3. The cover plate structure according to claim 1, characterized in that: In a direction perpendicular to the plane where the plate body (1) is located, the explosion-proof valve (2) is arranged flush with the outer surface of the plate body (1), or the explosion-proof valve (2) is arranged recessed relative to the outer surface of the plate body (1).

4. The cover plate structure according to claim 1, characterized in that: The material of the sealing ring (3) includes: fluororubber, nitrile rubber or EPDM rubber.

5. The cover plate structure according to claim 1, characterized in that: The elastic modulus E of the sealing ring (3) has a value range of 0.1 MPa≤E≤10 MPa.

6. The cover plate structure according to any one of claims 1 to 5, characterized in that: The explosion-proof valve (2) comprises a main body (22) and a step portion (21) arranged around the circumferential edge of the main body (22), wherein the step portion (21) is suitable for being embedded in the explosion-proof valve mounting sink (12); The sealing ring (3) abuts against the step portion (21).

7. The cover plate structure according to claim 6, characterized in that: The sealing ring (3) comprises a sealing body (31), and the sealing body (31) has a first positioning portion (32) protruding toward a side away from the explosion-proof valve (2); The sealing ring installation sink (13) is provided with a first positioning groove corresponding to the first positioning portion (32), and the first positioning portion (32) is suitable for being embedded in the first positioning groove.

8. The cover plate structure according to claim 6, characterized in that: The sealing ring (3) comprises a sealing body (31), and the sealing body (31) has a second positioning portion (33) protruding toward a side close to the explosion-proof valve (2); The step portion (21) is provided with a second positioning groove corresponding to the second positioning portion (33), and the second positioning portion (33) is suitable for being embedded in the second positioning groove.

9. The cover plate structure according to claim 6, characterized in that: In a direction parallel to the plane where the plate body (1) is located and from the edge of the explosion-proof valve hole (11) toward the center, the width of the sealing ring (3) is defined as M, and the width of the step portion (21) is defined as N, and the following conditions are satisfied: 0.8≤M / N≤1.

2.

10. A battery, characterized in that: It comprises: a shell, and a cover plate structure as described in any one of claims 1 to 9 fixedly connected to the shell.

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