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

[0001] The application is a divisional application of the invention with the title "cover plate structure and battery", the original application date is July 16, 2024, and the application number is 2024216844767. TECHNICAL FIELD

[0002] The utility model relates to battery technology field, concretely relates to a cover plate structure and battery. BACKGROUND

[0003] The battery generally includes a battery cell, a shell and a cover plate. The cover plate is sealingly arranged at the opening of the shell to form an accommodation cavity with the shell. The battery cell is arranged in the accommodation cavity. The cover plate is usually provided with a liquid injection hole to facilitate the injection of electrolyte. The preparation form of the battery cell includes winding type and laminated type. Regardless of winding type or laminated type, a separator needs to be arranged between the positive electrode sheet and the negative electrode sheet. After the battery cell is loaded into the accommodation cavity, the edge of the separator is arranged towards the cover plate.

[0004] However, the negative pressure in the negative pressure formation process can cause the separator to be adsorbed at the liquid injection hole, thereby blocking the liquid injection hole and affecting the secondary injection of the battery. SUMMARY

[0005] Therefore, the utility model provides a cover plate structure and battery to solve the problem that the separator easily blocks the liquid injection hole and affects the secondary injection of the battery.

[0006] In a first aspect, the utility model provides a cover plate structure, which comprises:

[0007] a cover plate body, which is provided with a liquid injection hole;

[0008] an insulating plate, which is arranged on one side of the large face of the cover plate body and is provided with a clearance hole corresponding to the position of the liquid injection hole; the insulating plate extends to form a plurality of protrusions on the side away from the cover plate body; and the plurality of protrusions are arranged around the clearance hole;

[0009] the end face area of the protrusion away from the side of the insulating plate is defined as a, and the shortest distance between two adjacent protrusions is defined as b, and the following formula is satisfied: 0.2mm≤a / b≤45mm.

[0010] Beneficial effects: the cover plate structure provided by the embodiment of the utility model, a plurality of protrusions are formed on the side of the insulating plate away from the cover plate body, and the plurality of protrusions are arranged around the avoiding hole; by arranging the protrusions, the diaphragm on the side of the insulating plate can be supported, the diaphragm is prevented from being adsorbed on the avoiding hole or the liquid injection hole due to negative pressure, the avoiding hole or the liquid injection hole is prevented from being blocked, and thus the secondary liquid injection is ensured to be carried out smoothly. By limiting the relationship between the end surface area a of the protrusion away from the side of the insulating plate and the shortest distance b between the adjacent two protrusions, when the shortest distance b between the adjacent two protrusions is constant, if the end surface area a of the protrusion away from the side of the insulating plate is too small, the supporting force of the protrusion on the diaphragm is insufficient, the diaphragm is easily adsorbed on the avoiding hole, and the liquid injection hole is blocked; if the end surface area a of the protrusion away from the side of the insulating plate is too large, too much electrolyte flow space is occupied, and the rate of electrolyte inflow during liquid injection is affected. Conversely, when the end surface area a of the protrusion away from the side of the insulating plate is constant, if the shortest distance b between the adjacent two protrusions is too large, the support of the protrusion on the diaphragm is insufficient, the diaphragm between the adjacent two protrusions collapses, and the liquid injection hole is blocked due to being easily adsorbed on the avoiding hole; if the shortest distance b between the adjacent two protrusions is too small, the electrolyte flow space is also insufficient, and the rate of electrolyte inflow during liquid injection is affected.

[0011] In a second aspect, the utility model also provides a kind of battery, comprising:

[0012] Battery cell;And

[0013] The cover plate structure as described above;

[0014] The insulating plate is arranged between the battery cell and the cover plate body.

[0015] In the direction perpendicular to the plane of the insulating plate, the shortest distance between the battery cell and the protrusion is S, which satisfies: 0mm≤S≤5mm.

[0016] Beneficial effects: by limiting the lower limit of the shortest distance S between the battery cell and the protrusion, a certain gap between the battery cell and the protrusion can be ensured, the deformation of the diaphragm under the action of negative pressure is avoided, and the blocking of the diaphragm due to negative pressure adsorption on the avoiding hole is prevented. 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 DRAWINGS

[0017] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. Obviously, the drawings described in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0018] Figure 1 is a schematic view of the cover plate structure of the present application Figure 1 ;

[0019] Figure 2 is an exploded view of the cover plate structure of the present application

[0020] Figure 3 is a schematic view of the cover plate structure of the present application Figure 2 ;

[0021] Figure 4 is a bottom view of the cover plate structure of the present application

[0022] Figure 5 is a partial enlarged view of the insulation plate of the present application

[0023] Figure 6 is Figure 4 a schematic view of A-A section in the present application

[0024] Figure 7 is Figure 4 a schematic view of the deformation of the insulation plate from the perspective of A-A section.

[0025] Explanation of reference signs:

[0026] 1, cover plate body; 11, liquid injection hole

[0027] 2, insulation plate; 21, avoiding hole; 22, protrusion; 23, groove part

[0028] 3, pole; 4, explosion-proof valve DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0030] In the description of the utility model, it needs to explain that, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "internal", "external" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second" and "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0031] In the description of the utility model, it needs to explain that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be broadly understood, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific situation.

[0032] In addition, the technical features involved in different embodiments of the utility model described below can be combined with each other as long as there is no conflict.

[0033] The battery generally includes a cell, a shell and a cover plate, wherein the cover plate is sealingly arranged at the opening of the shell to form an accommodation cavity with the shell and the cover plate, and the cell is arranged in the accommodation cavity. After the battery is assembled, the inside of the accommodation cavity needs to be injected with liquid, and an injection hole is usually formed on the cover plate so as to inject electrolyte into the inside of the battery through the injection hole. The cell is formed by stacking or winding the positive plate, the negative plate and the diaphragm, and the diaphragm is arranged between the positive plate and the negative plate to realize ion conduction and electronic insulation. The commonly used material of the diaphragm is PP, PE and the like. When the cover plate is arranged at one side of the cell tab lead-out end, at this time, the diaphragm is close to the injection hole due to the diaphragm exceeding the positive and negative plates. When the cover plate and the cell tab lead-out end are not on the same side, the diaphragm will be wrapped around the cell for a certain distance after the stacking or winding is completed, so that the diaphragm is close to the injection hole.

[0034] In a one-time injection process, the electrolyte is injected into the accommodation cavity from the injection hole under the action of positive pressure, at this time, the diaphragm has a distance from the injection hole, and will not affect normal injection. After the electrolyte is injected into the cell, a negative pressure formation process is needed, in which process, the inside of the battery shell is in a negative pressure state, the diaphragm is easily adsorbed at the injection hole due to the negative pressure, which blocks the injection hole and affects the secondary injection of the battery.

[0035] The embodiments of the utility model will be described below in combination with Figures 1 to 7

[0036] ​According to the embodiment of the utility model, on the one hand, a cover plate structure is provided, comprising:

[0037] The cover plate body 1 is provided with a liquid injection hole 11;

[0038] The insulating plate 2 is arranged on one side of the large face of the cover plate body 1, and the insulating plate 2 is provided with a clearance hole 21 corresponding to the position of the liquid injection hole 11; the insulating plate 2 is extended to form a plurality of protrusions 22 on the side away from the cover plate body 1, and the plurality of protrusions 22 are arranged around the clearance hole 21;

[0039] The end face area of the protrusion 22 away from the side of the insulating plate 2 is defined as a, and the shortest distance between the adjacent two protrusions 22 is defined as b, and the following condition is met: 0.2mm≤a / b≤45mm.

[0040] In the embodiment, the material of the cover plate body 1 can be aluminum, aluminum alloy or stainless steel, etc.

[0041] The cover plate structure of the embodiment is applied to a battery, and in the assembly process of the battery, the battery cell is first assembled into the shell, and then the cover plate structure is sealingly arranged at the opening of the shell. The cover plate structure is composed of the cover plate body 1 and the insulating plate 2, wherein the insulating plate 2 can abut against the battery cell to prevent the battery cell from moving along the assembly direction, and the insulating plate 2 can also 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 liquid injection hole 11, and in the process of primary liquid injection, the electrolyte is injected into the accommodating cavity from the liquid injection hole 11 under the action of positive pressure, at this time, the electrolyte is easy to flush away the diaphragm, and will not affect the normal liquid injection. After the electrolyte is injected into the battery, a negative pressure formation process is needed, in which process, the battery is in a negative pressure state, and the diaphragm close to the side of the insulating plate 2 is easy to be adsorbed at the clearance hole 21 or the liquid injection hole 11 due to the negative pressure, which will block the clearance hole 21 or the liquid injection hole 11, and affect the secondary liquid injection of the battery.

[0042] The cover plate structure provided by the embodiment of the utility model, the insulating plate 2 is extended to form a plurality of protrusions 22 on the side away from the cover plate body 1, and the plurality of protrusions 22 are arranged around the clearance hole 21; by arranging the protrusions 22, the diaphragm close to the side of the insulating plate 2 can be supported, so that the diaphragm is prevented from being adsorbed at the clearance hole 21 or the liquid injection hole 11 due to the negative pressure, and the clearance hole 21 or the liquid injection hole 11 is prevented from being blocked, thereby ensuring the smooth secondary liquid injection.

[0043] The end face area a of the protrusion 22 away from one side of the insulating plate 2 and the shortest distance b between the adjacent two protrusions 22 are limited, when the shortest distance b between the adjacent two protrusions 22 is constant, if the end face area a of the protrusion 22 away from one side of the insulating plate 2 is too small, the support of the protrusion 22 to the diaphragm is insufficient, the diaphragm is easily adsorbed at the avoiding hole, and the liquid injection hole is blocked; if the end face area a of the protrusion 22 away from one side of the insulating plate 2 is too large, too much electrolyte flow space is occupied, and the rate of electrolyte flowing in during liquid injection is affected. Conversely, when the end face area a of the protrusion 22 away from one side of the insulating plate 2 is constant, if the shortest distance b between the adjacent two protrusions 22 is too large, the support of the protrusion 22 to the diaphragm is insufficient, the diaphragm between the adjacent two protrusions 22 collapses, and the liquid injection hole is easily blocked by being adsorbed at the avoiding hole; if the shortest distance b between the adjacent two protrusions 22 is too small, the electrolyte flow space is also insufficient, and the rate of electrolyte flowing in during liquid injection is affected.

[0044] In the embodiment, the cover plate body 1 is further provided with a pole 3 and an explosion-proof valve 4.

[0045] In some embodiments, the value range of a is 2mm 2 ≤a≤45mm 2 , and the value range of b is 1mm≤b≤10mm.

[0046] As a further preferred, the value range of a is 3mm 2 ≤a≤40mm 2 , and the value range of b is 1mm≤b≤10mm.

[0047] In some embodiments, the value of a can be 3mm 2 , 5mm 2 , 8mm 2 , 10mm 2 , 15mm 2 , 20mm 2 , 25mm 2 , 28mm 2 , 30mm 2 , 33mm 2 , 37mm 2 , 40mm 2 , etc.

[0048] In some embodiments, the value of b can be 1mm, 3mm, 5mm, 6mm, 7mm, 9mm, 10mm, etc.

[0049] In some embodiments, in combination Figure 6As shown, in the 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 h, and it satisfies: 0.5mm≤a / h≤40mm.

[0050] Considering that the diaphragm is always in contact with multiple protrusions 22 under extreme use conditions, at this time, the flow area of the electrolyte is the area between the adjacent two protrusions 22.

[0051] 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 increased to ensure the flow area between the adjacent two protrusions 22, thereby ensuring the flow amount of the electrolyte between the 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 to avoid increasing the molding difficulty of the insulating plate 2. In addition, when a is small, h can be appropriately reduced to avoid the protrusion 22 being too high 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 to ensure the flow area between the adjacent two protrusions 22, thereby avoiding affecting the flow amount of the electrolyte between the adjacent protrusions 22.

[0052] In some embodiments, the area of the large face of the cover plate body 1 is M, and the sum of the end surface areas of the multiple protrusions 22 away from the insulating plate 2 is A, which satisfies: 37≤M / A≤1500, wherein the value range of M is 3000mm²≤M≤15000mm², and the value range of A is 10mm²≤A≤80mm².

[0053] In the present embodiment, the area M of the large face of the cover plate body 1 is comparable to the area of the insulating plate 2, and also comparable to the area of the diaphragm that can be adsorbed to the insulating plate 2. By limiting the relationship between the area M of the large face of the cover plate body 1 and the sum A of the end surface areas of the multiple protrusions 22 away from the insulating plate 2, it is ensured that the total area of the end surfaces of the multiple protrusions 22 can smoothly support the diaphragm, preventing the situation that the diaphragm is adsorbed and contacted with the multiple protrusions 22, and the multiple protrusions 22 cannot smoothly support the diaphragm, from occurring, and avoiding the situation that the diaphragm blocks the avoiding hole 21.

[0054] In some embodiments, the value of M can be specifically 3000mm 2 or 5000mm 2 or 8000mm 2 or 10000mm 2 or 13000mm 2 or 15000mm 2 , etc.

[0055] In some embodiments, the value of A can be specifically 10mm 2 or 15mm 2or 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 and so on.

[0056] In some embodiments, the protrusion 22 is gradually reduced in cross-sectional area parallel to the plane in which the insulating plate 2 lies along the extension direction of the protrusion 22. Figure 6 As shown in the figure, the protrusion 22 is gradually reduced in cross-sectional area parallel to the plane in which the insulating plate 2 lies along the extension direction of the protrusion 22.

[0057] By gradually reducing the cross-sectional area of the protrusion 22 parallel to the plane in which the insulating plate 2 lies, the processing and forming of the insulating plate 2 can be facilitated, and the structural strength of the protrusion 22 can be ensured.

[0058] In combination with the above, Figure 6 As shown in the figure, the protrusion 22 is gradually reduced in cross-sectional area parallel to the plane in which the insulating plate 2 lies along the extension direction of the protrusion 22.

[0059] In some other embodiments, in combination with the above, Figure 7 As shown in the figure, the protrusion 22 is gradually increased in cross-sectional area parallel to the plane in which the insulating plate 2 lies along the extension direction of the protrusion 22.

[0060] By gradually increasing the cross-sectional area of the protrusion 22 parallel to the plane in which the insulating plate 2 lies, when the diaphragm is in the limit use condition of being in close contact with the plurality of protrusions 22, the area between the adjacent two protrusions 22 can be further improved, thereby increasing the electrolyte flow rate between the adjacent two protrusions 22 and ensuring smooth injection.

[0061] In some embodiments, the following condition is met: 0.5≤a / b≤10.

[0062] In some embodiments, in combination with the above, Figure 3 , Figure 5 , Figure 6 As shown in the figure, a groove portion 23 is recessed on the side surface of the insulating plate 2 away from the cover plate body 1, in the direction perpendicular to the plane in which the insulating plate 2 lies, the projection of the avoiding 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.

[0063] In the direction perpendicular to the plane in which the insulating plate 2 lies, the height h of the protrusion 22 protruding from the insulating plate 2 is defined, and the depth t of the groove portion 23 recessed from the insulating plate 2 is defined, and the following condition is met: h>t.

[0064] By recessing the groove portion 23 on the side surface of the insulation plate 2 away from the cover plate body 1 and arranging the avoiding hole 21 within the range of the groove portion 23, the gap between the insulation plate 2 and the diaphragm can be increased, thereby increasing the flow area and reducing the risk of the avoiding hole 21 being blocked by the diaphragm.

[0065] Meanwhile, the protrusion 22 is arranged within the range of the groove portion 23, and the height h of the protrusion 22 protruding from the insulation plate 2 is greater than the depth t of the groove portion 23 recessed from the insulation plate 2, thereby ensuring smooth support of the diaphragm by the protrusion 22 and further increasing the area of the region between adjacent two protrusions 22 for flow, thereby ensuring the flow amount of the electrolyte between adjacent two protrusions 22, and arranging the protrusion 22 within the groove portion 23 can reduce the height of the protrusion 22 as a whole and improve the space utilization rate inside the battery.

[0066] In addition, in combination with Figure 3 As shown in the figure, the insulation plate 2 also protrudes to form an abutting portion on the side close to the battery cell, and the abutting portion is used to abut against the surface of the battery cell to ensure the abutting of the battery cell in the installed state and avoid the battery cell jumping in the loading direction under the jolting working condition, thereby ensuring the firm fixation of the battery cell. In the embodiment, the shortest distance between the protrusion 22 and the negative plate of the battery cell is greater than or equal to the shortest distance between the abutting portion of the insulation plate 2 and the battery cell, that is, the protrusion 22 is not arranged to protrude on the side surface of the insulation plate close to the battery cell, thereby avoiding the damage of the protruding protrusion 22 to the battery cell.

[0067] In some embodiments, in combination with Figure 5 As shown in the figure, the avoiding hole 21 is a circular hole; and the number of the protrusions 22 is four, and the four protrusions 22 are evenly distributed around the avoiding hole 21.

[0068] By arranging the four protrusions 22 around the avoiding hole 21 and evenly distributing them, it can not only ensure that there is sufficient flow area between every two adjacent protrusions 22, but also ensure that the diaphragm is uniformly supported by the plurality of protrusions 22, so that the electrolyte flowing out of the avoiding hole 21 is more evenly distributed, thereby improving the infiltration efficiency of the electrolyte to the battery cell and ensuring the infiltration effect.

[0069] In some embodiments, in combination with Figure 5 As shown in the figure, the minimum distance between the edge of the protrusion 22 close to the avoiding hole 21 and the avoiding hole 21 is e, and it satisfies: 0.5mm≤e≤3mm.

[0070] By limiting the lower limit of the minimum distance e between the edge of the protrusion 22 on the side close to the escape hole 21 and the escape hole 21, the molding of the protrusion 22 can be ensured, and the mutual interference between the protrusion 22 and the escape hole 21 can be avoided. At the same time, by limiting the upper limit of the minimum distance e between the edge of the protrusion 22 on the side close to the escape hole 21 and the escape hole 21, the protrusion 22 can be prevented from being too far away from the escape hole 21, so as to prevent the flexible diaphragm from being easily blocked by the negative pressure adsorbed on the escape hole 21, and to ensure the smooth flow of the escape hole 21.

[0071] According to the embodiments of the utility model, on the other hand, a battery is also provided, which comprises:

[0072] The battery further comprises:

[0073] The cover plate structure as described above;

[0074] In the direction perpendicular to the plane where the insulating plate 2 is located, the shortest distance between the electric core and the protrusion 22 is S, which satisfies: 0mm≤S≤5mm.

[0075] By limiting the lower limit of the shortest distance S between the electric core and the protrusion 22, a certain gap between the electric core and the protrusion 22 can be ensured, and the deformation of the diaphragm under the action of the negative pressure suction can be avoided. At the same time, by limiting the upper limit of the shortest distance S between the electric core and the protrusion 22, the size waste can be avoided, and the energy density of the battery can be improved.

[0076] Obviously, the above embodiments are only examples for clearly illustrating, and are not limited to the embodiments. Although the embodiments of the utility model are described in combination with the drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the utility model, and such modifications and variations all fall within the scope defined by the utility model.

Claims

1. A cover structure, characterized by The application relates to a cover plate structure. The cover plate body (1) is provided with a liquid injection hole (11); an insulation plate (2) is arranged on one side of the large face of the cover plate body (1), the insulation plate (2) is provided with a avoiding hole (21) corresponding to the position of the liquid injection hole (11); a plurality of protrusions (22) are formed on the side of the insulation plate (2) away from the cover plate body (1), and the plurality of protrusions (22) are arranged around the avoiding hole (21); The end face area of the protrusion (22) away from the insulation plate (2) is defined as a, and the shortest distance between two adjacent protrusions (22) is defined as b, and the following conditions are met: 0.2mm<=a / b<=45mm; The cross-sectional area of the protrusion (22) gradually decreases along the extension direction of the protrusion (22) and the plane of the insulation plate (2); The value range of a is 3mm2<=a<=40mm2, and the value range of b is 1mm<=b<=10mm. In the direction perpendicular to the plane of the insulation plate (2), the height of the protrusion (22) protruding from the insulation plate (2) is defined as h, and the following conditions are met: 0.5mm<=a / h<=40mm.

2. The cover plate structure according to claim 1, wherein The side surface of the insulation plate (2) away from the cover plate body (1) is recessed to form a groove part (23), in the direction perpendicular to the plane of the insulation plate (2), the projection of the avoiding hole (21) falls within the range of the groove part (23), and the projection of the protrusion (22) falls within the range of the groove part (23); 3. The cover plate structure according to claim 1, wherein An area of a large face of the cover plate body (1) is defined as M, and a sum of areas of end faces of the plurality of protrusions (22) away from the insulating plate (2) is defined as A, and satisfies: 37≤M / A≤1500, wherein M is in a range of 3000mm 2 ≤M≤15000mm 2 , and A is in a range of 10mm 2 ≤A≤80mm 2 .

4. The cover plate structure according to any one of claims 1 to 3, characterized in that, In the direction perpendicular to the plane of the insulation plate (2), the height of the protrusion (22) protruding from the insulation plate (2) is defined as h, and the depth of the groove part (23) recessed from the insulation plate (2) is defined as t, and the following conditions are met: h>t. The minimum distance between the edge of the protrusion (22) close to the side of the avoiding hole (21) and the avoiding hole (21) is e, and the following conditions are met: 0.5mm<=e<=3mm.

5. The cover plate structure according to claim 1, wherein The application relates to a cover plate structure.

6. A battery, characterized by The insulation plate (2) is arranged between the electric core and the cover plate body (1). In the direction perpendicular to the plane of the insulation plate (2), the shortest distance between the electric core and the protrusion (22) is S, and the following conditions are met: 0mm<=S<=5mm. ​ ​ ​ 7. The battery of claim 6, wherein, ​

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