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 cover plate body, which is provided with a liquid injection hole; the insulating plate is arranged on one side of the large surface of the cover plate body, and an avoiding hole is formed in the position, corresponding to the liquid injection hole, of the insulating plate; the side, away from the cover plate body, of the insulating plate extends to form a plurality of protrusions, and the protrusions are arranged around the receding hole. The area of the end face of the side, away from the insulating plate, of each protrusion is defined as a, the shortest distance between every two adjacent protrusions is defined as b, and a / b is larger than or equal to 0.2 mm and smaller than or equal to 45 mm. According to the cover plate structure provided by the utility model, the diaphragm close to one side of the insulating plate can be supported, the diaphragm is prevented from being adsorbed to the avoiding hole or the liquid injection hole due to negative pressure, and the avoiding hole or the liquid injection hole is prevented from being blocked, so that the smooth operation of secondary liquid injection is ensured.

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 generally includes a cell, a shell and a cover plate, wherein the cover plate is sealed at the opening of the shell so that the shell and the cover plate enclose a receiving cavity, and the cell is arranged in the receiving cavity. The cover plate is usually provided with an injection hole to facilitate the injection of electrolyte. The preparation forms of the cell include winding type, stacking type, etc. Whether it is winding type or stacking type, a diaphragm needs to be arranged between the positive electrode sheet and the negative electrode sheet. After the cell is loaded into the receiving cavity, the edge of the diaphragm is arranged toward the cover plate.

[0003] However, during the negative pressure formation process, the negative pressure will cause the diaphragm to be adsorbed on the injection hole, blocking the injection hole and thus affecting the secondary injection of the battery. 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 diaphragm easily blocks the injection hole and affects the secondary injection of the battery.

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

[0006] The cover plate body is provided with a liquid injection hole;

[0007] The insulating plate is arranged on one side of the large surface of the cover body, and a avoidance hole is opened on the insulating plate corresponding to the injection hole; the insulating plate extends toward the side away from the cover body to form a plurality of protrusions, and the plurality of protrusions are arranged around the avoidance hole;

[0008] The end surface area of ​​the protrusion away from the insulating plate is defined as a, and the shortest distance between two adjacent protrusions is defined as b, satisfying: 0.2mm≤a / b≤45mm.

[0009] Beneficial effect: The cover plate structure provided by the embodiment of the utility model has a plurality of protrusions extending from the side of the insulating plate away from the cover plate body, and the plurality of protrusions are arranged around the avoidance hole; by arranging the protrusions, the diaphragm close to the insulating plate side can be supported to prevent the diaphragm from being adsorbed at the avoidance hole or the injection hole due to negative pressure, and to prevent the avoidance hole or the injection hole from being blocked, thereby ensuring the smooth secondary injection. By limiting the relationship between the end surface area a of the protrusion away from the insulating plate and the shortest spacing b between two adjacent protrusions, when the shortest spacing b between two adjacent protrusions is constant, if the end surface area a of the protrusion away from the insulating plate is too small, it is easy to cause the protrusion to have insufficient support for the diaphragm, so that the diaphragm is easily adsorbed at the avoidance hole, thereby blocking the injection hole; if the end surface area a of the protrusion away from the insulating plate is too large, it is easy to occupy too much electrolyte circulation space, affecting the rate of electrolyte inflow during injection. On the contrary, when the end face area a of the protrusion away from the insulating plate is constant, if the shortest spacing b between two adjacent protrusions is too large, it will easily lead to insufficient support of the protrusions for the diaphragm, causing the diaphragm between the two adjacent protrusions to collapse, and then easily adsorbed on the avoidance hole to block the injection hole; if the shortest spacing b between two adjacent protrusions is too small, it will also easily lead to insufficient circulation space for the electrolyte, thereby affecting the rate of electrolyte inflow during injection.

[0010] In a second aspect, the utility model further provides a battery, comprising:

[0011] Battery cells; and

[0012] As the cover plate structure described above;

[0013] The insulating plate is arranged between the battery core and the cover plate body.

[0014] In the direction perpendicular to the plane of the insulating plate, the shortest distance between the battery cell and the protrusion is S, satisfying: 0mm≤S≤5mm.

[0015] Beneficial effect: By limiting the lower limit of the shortest distance S between the battery cell and the protrusion, a certain gap can be ensured between the battery cell and the protrusion, leaving an escape space for the deformation of the diaphragm under the action of negative pressure suction, and preventing the diaphragm from being blocked by the avoidance hole due to negative pressure adsorption. At the same time, by limiting the upper limit of the shortest distance S between the battery cell and the protrusion, size waste can be avoided and the energy density of the battery can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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.

[0017] Figure 1 The schematic diagram of the cover structure of the utility model Figure 1 ;

[0018] Figure 2 It is an exploded schematic diagram of the cover plate structure of the utility model;

[0019] Figure 3 The schematic diagram of the cover structure of the utility model Figure 2 ;

[0020] Figure 4 This is a bottom view of the cover plate structure of the utility model;

[0021] Figure 5 It is a partial enlarged view of the insulation board of the utility model;

[0022] Figure 6 for Figure 4 Schematic diagram of the AA section;

[0023] Figure 7 for Figure 4 Schematic diagram of the deformation of the insulation board from the perspective of the middle AA section.

[0024] Description of reference numerals:

[0025] 1. Cover plate body; 11. Liquid injection hole;

[0026] 2. Insulating plate; 21. Avoidance hole; 22. Protrusion; 23. Groove;

[0027] 3. Pole; 4. Explosion-proof valve. DETAILED DESCRIPTION

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] The battery generally includes a cell, a shell and a cover plate, wherein the cover plate is sealed at the opening of the shell so that the shell and the cover plate are enclosed to form a receiving cavity, and the cell is arranged in the receiving cavity. After the battery is assembled, it is necessary to inject liquid into the receiving cavity. Usually, an injection hole is opened on the cover plate so that the electrolyte can be injected into the battery through the injection hole. The cell is formed by stacking or winding the positive electrode sheet, the negative electrode sheet and the diaphragm. The diaphragm is placed between the positive electrode sheet and the negative electrode sheet to achieve ion conduction and electronic insulation. The commonly used materials of the diaphragm are PP, PE, etc. When the cover plate is arranged on one side of the cell tab lead-out end, the diaphragm exceeds the positive and negative electrode sheets at this time, and the diaphragm is close to the injection hole; when the cover plate and the cell tab lead-out end are not on the same side, the diaphragm will wrap around the cell for a certain distance after the stacking or winding is completed, resulting in the diaphragm being closer to the injection hole.

[0033] During the primary injection process, the electrolyte is injected into the containing cavity from the injection hole under the action of positive pressure. At this time, there is a distance between the diaphragm and the injection hole, which will not affect the normal injection. After the electrolyte is injected into the battery cell, a negative pressure formation process is required. During this process, the inside of the battery shell is in a negative pressure state. The diaphragm is easily adsorbed to the injection hole due to negative pressure, blocking the injection hole and affecting the secondary injection of the battery.

[0034] Combine the following Figures 1 to 7 , describing an embodiment of the utility model.

[0035] According to an embodiment of the present utility model, on the one hand, a cover plate structure is provided, comprising:

[0036] The cover body 1 is provided with a liquid injection hole 11;

[0037] The insulating plate 2 is arranged on one side of the large surface of the cover body 1, and a avoidance hole 21 is opened on the insulating plate 2 at a position corresponding to the injection hole 11; the insulating plate 2 extends toward a side away from the cover body 1 to form a plurality of protrusions 22, and the plurality of protrusions 22 are arranged around the avoidance hole 21;

[0038] The end surface area of ​​the protrusion 22 away from the insulating plate 2 is defined as a, and the shortest distance between two adjacent protrusions 22 is defined as b, which satisfies: 0.2 mm ≤ a / b ≤ 45 mm.

[0039] In this embodiment, the cover body 1 may be made of aluminum, aluminum alloy, stainless steel, or the like.

[0040] The cover plate structure of this embodiment is applied to the battery. During the assembly process of the battery, the battery cell is first loaded into the shell, and then the cover plate structure is sealed and set at the opening of the shell. The cover plate structure is composed of a cover plate body 1 and an insulating plate 2, wherein the insulating plate 2 can abut the battery cell to prevent the battery cell from moving along the loading direction, and the insulating plate 2 can insulate the battery cell from the cover plate body 1. Since the battery cell includes a diaphragm, under normal circumstances, the diaphragm will not block the injection hole 11, and in the process of one injection, the electrolyte is injected into the accommodating cavity from the injection hole 11 under the action of positive pressure. At this time, the electrolyte is easy to break the diaphragm and will not affect the normal injection. After the electrolyte is injected into the battery, a negative pressure formation process is required. During this process, the inside of the battery is in a negative pressure state, and the diaphragm close to the insulating plate 2 is easily adsorbed on the avoidance hole 21 or the injection hole 11 due to the negative pressure, which blocks the avoidance hole 21 or the injection hole 11 and affects the secondary injection of the battery.

[0041] The cover plate structure provided by the embodiment of the utility model has a plurality of protrusions 22 extending from the side of the insulating plate 2 away from the cover plate body 1, and the plurality of protrusions 22 are arranged around the avoidance hole 21; by arranging the protrusions 22, the diaphragm close to the side of the insulating plate 2 can be supported to prevent the diaphragm from being adsorbed on the avoidance hole 21 or the injection hole 11 due to negative pressure, thereby preventing the avoidance hole 21 or the injection hole 11 from being blocked, thereby ensuring the smooth progress of the secondary injection.

[0042] The cover plate structure provided by the embodiment of the utility model limits the relationship between the end surface area a of the protrusion 22 away from the insulating plate 2 and the shortest distance b between two adjacent protrusions 22. When the shortest distance b between two adjacent protrusions 22 is constant, if the end surface area a of the protrusion 22 away from the insulating plate 2 is too small, it is easy to cause the protrusion 22 to have insufficient support force on the diaphragm, so that the diaphragm is easily adsorbed on the avoidance hole, thereby blocking the injection hole; if the end surface area a of the protrusion 22 away from the insulating plate 2 is too large, it is easy to occupy too much electrolyte circulation space, affecting the rate of electrolyte inflow during injection. On the contrary, when the end surface area a of the protrusion 22 away from the insulating plate 2 is constant, if the shortest spacing b between two adjacent protrusions 22 is too large, it will easily lead to insufficient support of the protrusion 22 for the diaphragm, causing the diaphragm between the two adjacent protrusions 22 to collapse, and then it will be easy to be adsorbed on the avoidance hole to block the injection hole; if the shortest spacing b between two adjacent protrusions 22 is too small, it will also easily lead to insufficient circulation space for the electrolyte, thereby affecting the rate of electrolyte inflow during injection.

[0043] In this embodiment, the cover body 1 is further provided with a pole 3 and an explosion-proof valve 4 .

[0044] In some embodiments, the value range of a is 2 mm. 2 ≤a≤45mm 2 , the value range of b is 1mm≤b≤10mm.

[0045] As a further preferred embodiment, the value range of a is 3 mm. 2 ≤a≤40mm 2 , the value range of b is 1mm≤b≤10mm.

[0046] In some embodiments, the value of a can be 3 mm. 2 or 5mm 2 or 8mm 2 or 10mm 2 or 15mm 2 or 20mm 2 or 25mm 2 or 28mm 2 or 30mm 2 or 33mm 2 or 37mm 2 or 40mm 2 wait.

[0047] In some embodiments, the value of b can be 1 mm, 3 mm, 5 mm, 6 mm, 7 mm, 9 mm, 10 mm, etc.

[0048] In some embodiments, in combination Figure 6As shown, in a direction perpendicular to the plane where the insulating plate 2 is located, the height of the protrusion 22 protruding from the insulating plate 2 is defined as h, and satisfies: 0.5mm≤a / h≤40mm.

[0049] Considering that under extreme use conditions, the diaphragm always fits with the plurality of protrusions 22 , at this time, the flow area of ​​the electrolyte is the area between two adjacent protrusions 22 .

[0050] By limiting the relationship between the height h of the protrusion 22 protruding from the insulating plate 2 and the end surface area a of the protrusion 22 away from the insulating plate 2, when a is large, h can be appropriately adjusted to ensure the flow area between two adjacent protrusions 22, thereby ensuring the amount of electrolyte passing between adjacent protrusions 22; at the same time, the upper limit of h should be limited to avoid interference between the protrusion 22 and the battery cell, and avoid increasing the difficulty of forming the insulating plate 2. In addition, when a is small, h can be appropriately lowered to avoid the protrusion 22 being too high and unable to be processed and formed; at the same time, the lower limit of h should be limited to avoid the height h of the protrusion 22 protruding from the insulating plate 2 being too low, thereby failing to ensure the flow area between two adjacent protrusions 22, thereby avoiding affecting the amount of electrolyte passing between adjacent protrusions 22.

[0051] In some embodiments, the area of ​​the large surface of the cover body 1 is defined as M, and the sum of the end surface areas of the plurality of protrusions 22 away from the insulating plate 2 is A, satisfying: 37≤M / A≤1500, where the value range of M is 3000mm 2 ≤M≤15000mm 2 , the value range of A is 10mm 2 ≤A≤80mm 2 .

[0052] In this embodiment, the area M of the large surface of the cover body 1 is equivalent to the area of ​​the insulating plate 2, and is also equivalent to the area of ​​the diaphragm that can be adsorbed on the insulating plate 2. By limiting the relationship between the area M of the large surface of the cover body 1 and the sum A of the end surface areas of the plurality of protrusions 22 away from the insulating plate 2, it is ensured that the total end surface area of ​​the plurality of protrusions 22 can smoothly support the diaphragm, and prevent the plurality of protrusions 22 from being unable to smoothly support the diaphragm after the diaphragm is adsorbed and contacts the plurality of protrusions 22 due to the total end surface area of ​​the protrusions 22 being too small, and avoid the situation where the diaphragm blocks the avoidance hole 21.

[0053] In some embodiments, the value of M can be 3000 mm. 2 or 5000mm 2 or 8000mm 2 or 10000mm 2 or 13000mm 2 or 15000mm 2 wait.

[0054] In some embodiments, the value of A can be 10 mm. 2 or 15mm 2 or 25mm 2 or 30mm 2 or 35mm 2 or 40mm 2 or 50mm 2 or 55mm 2 or 60mm 2 or 70mm 2 or 75mm 2 or 80mm 2 wait.

[0055] In some embodiments, in combination Figure 6 As shown, along the extension direction of the protrusion 22, the cross-sectional area of ​​the protrusion 22 parallel to the plane where the insulating plate 2 is located gradually decreases.

[0056] By gradually reducing the cross-sectional area of ​​the protrusion 22 parallel to the plane where the insulating plate 2 is located, the processing and forming of the insulating plate 2 can be facilitated, and the structural strength of the protrusion 22 can be ensured.

[0057] Combination Figure 6 As shown, along the extension direction of the protrusion 22, the protrusion 22 forms an R angle at one end of the body away from the insulating plate 2, so that the cross-sectional area there is smaller than the cross-sectional area of ​​other areas of the protrusion 22 parallel to the plane where the insulating plate 2 is located.

[0058] In some other embodiments, in combination Figure 7 As shown, along the extension direction of the protrusion 22, the cross-sectional area of ​​the protrusion 22 parallel to the plane where the insulating plate 2 is located gradually increases.

[0059] By gradually increasing the cross-sectional area of ​​the protrusion 22 parallel to the plane of the insulating plate 2, it is possible to ensure that when the diaphragm is in the extreme operating condition of being in contact with multiple protrusions 22, the area between two adjacent protrusions 22 is further increased, thereby increasing the amount of electrolyte passing between two adjacent protrusions 22 and ensuring smooth injection.

[0060] In some embodiments, 0.5≤a / b≤10 is satisfied.

[0061] In some embodiments, in combination Figure 3 , Figure 5 , Figure 6 As shown, the surface of the insulating plate 2 on one side facing away from the cover plate body 1 is concave to form a groove portion 23, and in a direction perpendicular to the plane where the insulating plate 2 is located, the projection of the avoidance hole 21 falls within the range of the groove portion 23, and the projection of the protrusion 22 falls within the range of the groove portion 23;

[0062] In a direction perpendicular to the plane where the insulating plate 2 is located, the height of the protrusion 22 protruding from the insulating plate 2 is defined as h, and the depth of the groove portion 23 sunken from the insulating plate 2 is defined as t, satisfying: h>t.

[0063] By forming a groove portion 23 on the surface of the insulating plate 2 facing away from the cover plate body 1 and setting the avoidance hole 21 within the range of the groove portion 23, the gap between the insulating plate 2 and the diaphragm can be increased, thereby increasing the flow area and reducing the risk of the avoidance hole 21 being blocked by the diaphragm.

[0064] At the same time, the protrusion 22 is arranged within the range of the groove portion 23, and the height h of the protrusion 22 raised from the insulating plate 2 is greater than the depth t of the groove portion 23 recessed from the insulating plate 2, thereby ensuring that the protrusion 22 smoothly supports the diaphragm, and the area of ​​the area used for flow between two adjacent protrusions 22 can be further increased, thereby ensuring the electrolyte flow rate between two adjacent protrusions 22, and arranging the protrusion 22 in the groove portion 23 can reduce the height of the protrusion 22 as a whole, thereby improving the space utilization rate inside the battery.

[0065] In addition, combined Figure 3 As shown, the insulating plate 2 is also protruded to form an abutment portion on one side close to the battery cell, and the abutment portion is used to abut against the surface of the battery cell to ensure that the battery cell is tightly abutted in the installed state, to prevent the battery cell from jumping along the loading direction under bumpy conditions, and to ensure that the battery cell is firmly fixed. In this embodiment, the shortest distance between the protrusion 22 and the negative electrode sheet of the battery cell is greater than or equal to the shortest distance between the abutment portion of the insulating plate 2 and the battery cell, that is, the protrusion 22 is prevented from being protruded on the surface of the insulating plate close to the battery cell, thereby preventing the protrusion 22 from damaging the battery cell.

[0066] In some embodiments, in combination Figure 5 As shown, the avoidance hole 21 is a circular hole; the number of the protrusions 22 is four, and the four protrusions 22 surround the avoidance hole 21 and are evenly distributed.

[0067] By arranging four protrusions 22 around the avoidance hole 21 and distributing them evenly, it is possible to ensure that there is sufficient flow area between every two adjacent protrusions 22, and that multiple protrusions 22 can evenly support the diaphragm, so that after the electrolyte flows out of the avoidance hole 21, it is dispersed more evenly, thereby improving the infiltration efficiency of the electrolyte into the battery cell and ensuring the infiltration effect.

[0068] In some embodiments, in combination Figure 5 As shown, the minimum distance between the edge of the protrusion 22 close to the avoidance hole 21 and the avoidance hole 21 is e, and satisfies: 0.5 mm≤e≤3 mm.

[0069] By limiting the lower limit of the minimum spacing e between the edge of the protrusion 22 close to the avoidance hole 21 and the avoidance hole 21, it is possible to ensure that the protrusion 22 is smoothly formed and to avoid mutual interference between the protrusion 22 and the avoidance hole 21. At the same time, by limiting the upper limit of the minimum spacing e between the edge of the protrusion 22 close to the avoidance hole 21 and the avoidance hole 21, it is possible to avoid the protrusion 22 and the avoidance hole 21 being too far apart, to prevent the flexible diaphragm from having a large depression in the middle area of ​​the supporting positions of multiple protrusions 22, to avoid the diaphragm being easily adsorbed on the avoidance hole 21 due to negative pressure and causing obstruction, and to ensure smooth flow through the avoidance hole 21.

[0070] According to an embodiment of the present utility model, on the other hand, a battery is provided, comprising:

[0071] Battery cells; and

[0072] As the cover plate structure described above;

[0073] In a direction perpendicular to the plane where the insulating plate 2 is located, the shortest distance between the battery cell and the protrusion 22 is S, satisfying: 0mm≤S≤5mm.

[0074] By limiting the lower limit of the shortest distance S between the battery cell and the protrusion 22, a certain gap can be ensured between the battery cell and the protrusion 22, leaving an escape space for the deformation of the diaphragm under the action of negative pressure suction, and preventing the diaphragm from being blocked by the escape hole 21 due to negative pressure adsorption. At the same time, by limiting the upper limit of the shortest distance S between the battery cell and the protrusion 22, size waste can be avoided and the energy density of the battery can be improved.

[0075] 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 cover plate body (1) is provided with a liquid injection hole (11); An insulating plate (2) is arranged on one side of the large surface of the cover plate body (1), and a avoidance hole (21) is opened on the insulating plate (2) at a position corresponding to the injection hole (11); the insulating plate (2) extends toward a side away from the cover plate body (1) to form a plurality of protrusions (22), and the plurality of protrusions (22) are arranged around the avoidance hole (21); The end surface area of ​​the protrusion (22) away from the insulating plate (2) is defined as a, and the shortest distance between two adjacent protrusions (22) is defined as b, satisfying the following conditions: 0.2 mm ≤ a / b ≤ 45 mm.

2. The cover plate structure according to claim 1, characterized in that: In a direction perpendicular to the plane where the insulating plate (2) is located, the height of the protrusion (22) protruding from the insulating plate (2) is defined as h, and satisfies the following: 0.5 mm ≤ a / h ≤ 40 mm.

3. The cover plate structure according to claim 1, characterized in that: The area of ​​the large surface of the cover plate body (1) is defined as M, and the sum of the end surface areas of the plurality of protrusions (22) away from the insulating plate (2) is defined as A, satisfying: 37≤M / A≤1500, wherein the value range of M is 3000mm 2 ≤M≤15000mm 2 , the value range of A is 10mm 2 ≤A≤80mm 2 .

4. The cover plate structure according to any one of claims 1 to 3, characterized in that: Along the extension direction of the protrusion (22), the cross-sectional area of ​​the protrusion (22) parallel to the plane where the insulating plate (2) is located gradually decreases.

5. The cover plate structure according to any one of claims 1 to 3, characterized in that: Along the extension direction of the protrusion (22), the cross-sectional area of ​​the protrusion (22) parallel to the plane where the insulating plate (2) is located gradually increases.

6. The cover plate structure according to any one of claims 1 to 3, characterized in that: A groove portion (23) is formed on a surface of the insulating plate (2) on one side facing away from the cover plate body (1); in a direction perpendicular to the plane where the insulating plate (2) is located, the projection of the avoidance hole (21) falls within the range of the groove portion (23), and the projection of the protrusion (22) falls within the range of the groove portion (23); In a direction perpendicular to the plane where the insulating plate (2) is located, the height of the protrusion (22) protruding from the insulating plate (2) is defined as h, and the depth of the groove portion (23) recessed from the insulating plate (2) is defined as t, satisfying: h>t.

7. The cover plate structure according to claim 1, characterized in that: The minimum distance between the edge of the protrusion (22) on the side close to the avoidance hole (21) and the avoidance hole (21) is e, and satisfies: 0.5mm≤e≤3mm.

8. The cover plate structure according to claim 1, characterized in that: The value range of a is 3mm 2 ≤a≤40mm 2 , the value range of b is 1mm≤b≤10mm.

9. A battery, characterized in that: include: Battery cells; as well as The cover plate structure according to any one of claims 1 to 8; The insulating plate (2) is arranged between the battery core and the cover plate body (1).

10. The battery according to claim 9, characterized in that In a direction perpendicular to the plane where the insulating plate (2) is located, the shortest distance between the battery cell and the protrusion (22) is S, satisfying: 0mm≤S≤5mm.

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