Battery cover plate and battery

Abstract

The invention belongs to the technical field of batteries, and discloses a battery cover plate and a battery, the battery cover plate comprises a conductive pole and an insulating part, the conductive pole comprises a pole main body and a pole bottom plate, the insulating part is provided with an insertion through hole and an accommodating groove, the accommodating groove is internally provided with a support boss and an avoiding groove, and the insertion through hole is communicated with the supporting boss. The area size of the supporting boss is S1, the area size of the avoiding groove is S2, the height size of the supporting boss in the first direction is L, the depth size of the avoiding groove in the first direction is F, and (S1 * L) / (S2 * F) is larger than 0.5 and smaller than or equal to 1. On one hand, the material thickness of the contact area of the insulating part and the pole bottom plate is increased, the probability of short circuit caused by breakdown is reduced, on the other hand, the appearance size of the battery cover plate is prevented from being increased by utilizing the avoiding groove, and in addition, by limiting the related size of the volume of the supporting boss and the related size of the volume of the avoiding groove, the reliability of the battery cover plate is improved. And it is guaranteed that the avoiding groove has enough space to contain the deformation protrusion after the supporting boss is heated and deformed.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery cover and a battery. Background Art

[0002] As an important part of lithium batteries, the structural design of the battery cover not only affects the basic performance of the battery, such as capacity and charge and discharge efficiency, but is also directly related to the safety and long-term reliability of the battery. The main structural components of the battery cover include conductive electrode columns, aluminum plates, plastic parts and explosion-proof valves.

[0003] In order to avoid short circuit caused by direct contact between the conductive electrode column and the bare aluminum plate, a plastic part for insulation is usually provided between the conductive electrode column and the bare aluminum plate. However, when the conductive electrode column and the pole ear are connected by laser welding, the heat generated during the welding process will cause the temperature of the conductive electrode column to rise rapidly, resulting in the temperature of the conductive electrode column being too high. A large amount of heat is transferred to the plastic part between the conductive electrode column and the bare aluminum plate, causing the plastic part to deform due to heat and extend in the horizontal direction. This will not only increase the probability of the plastic part being broken down due to the reduction in thickness, resulting in a high short circuit risk and poor insulation protection, but also change the outer dimensions of the battery cover due to the deformation of the plastic part, making it difficult to assemble the battery cover into the battery shell and the assembly process is poor. Summary of the invention

[0004] The object of the present invention is to provide a battery cover and a battery, which have good insulation protection and assembly processability.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] In one aspect, a battery cover is provided, the battery cover comprising:

[0007] A conductive electrode column, the conductive electrode column comprising a pole body and a pole bottom plate, the pole body being connected to the pole bottom plate, and a side of the pole bottom plate facing away from the pole body being welded to a pole ear;

[0008] An insulating member, wherein the insulating member is provided with a plug-in through hole for the pole body to pass through and a receiving groove for accommodating the pole bottom plate, wherein the receiving groove is provided with a supporting boss protruding in a direction close to the pole bottom plate, and a avoiding groove is formed between the supporting boss and the inner side wall of the receiving groove;

[0009] The area dimension of the support boss is S1, the area dimension of the avoidance groove is S2, the height dimension of the support boss along the first direction is L, the depth dimension of the avoidance groove along the first direction is F, and 0.5<(S1×L) / (S2×F)≤1 is satisfied.

[0010] Optionally, a height dimension L of the supporting boss along the first direction satisfies 0.15 mm ≤ L < F.

[0011] Optionally, a depth dimension F of the avoidance groove along the first direction satisfies 0.3mm≤F≤0.5mm.

[0012] Optionally, the accommodating groove includes a first wall surface opposite to the pole bottom plate along the first direction, a second wall surface opposite to the pole bottom plate along the second direction, and a third wall surface opposite to the pole bottom plate along the third direction, the supporting boss is arranged on the first wall surface, and the second wall surface is provided with a limiting protrusion abutting against the pole bottom plate.

[0013] Optionally, a gap size between a surface of the pole bottom plate abutting against the limiting protrusion and the second wall surface along the second direction is W, and satisfies 0.3 mm ≤ W ≤ 0.5 mm.

[0014] Optionally, the battery cover further includes a cover body, the insulating member is disposed between the cover body and the pole bottom plate, and the thickness along the first direction between the surface where the insulating member abuts against the cover body and the first wall surface is not less than 0.5 mm.

[0015] Optionally, the pole base plate includes a first connecting plate, a second connecting plate and a fuse plate, the fuse plate is arranged between the first connecting plate and the second connecting plate, the pole body is connected to the first connecting plate, and the second connecting plate is connected to the pole ear on the side away from the pole body.

[0016] Optionally, a blocking slot is provided on the fuse plate.

[0017] Optionally, the conductive electrode column further includes an insulating rubber sleeve, and the insulating rubber sleeve is arranged on the outer side of the fuse plate.

[0018] On the other hand, a battery is provided, comprising a pole group, a battery shell and a battery cover as described in any one of the above items, wherein the battery shell is a cavity structure with an opening, and the battery cover is arranged at the opening of the battery shell to close the battery shell to form a accommodating cavity for accommodating the pole group.

[0019] Beneficial effects of the present invention:

[0020] The present invention provides a battery cover plate. By arranging a support boss protruding towards the pole post bottom plate in the accommodation groove of the insulating part and forming an avoidance groove between the support boss and the inner side wall of the accommodation groove, on the one hand, the material thickness of the contact area between the insulating part and the pole post bottom plate is thickened, thereby avoiding the reduction in thickness due to the heat influence during the welding of the pole ear and the pole post, which may cause the contact area between the insulating part and the pole post bottom plate to melt and deform, increasing the probability of breakdown and short circuit, and improving the insulation protection performance. On the other hand, by using the formed avoidance groove, when the support boss deforms horizontally due to heat influence, the avoidance groove is used to accommodate the protruding part after deformation, thus avoiding the increase in the outer dimension of the battery cover plate, making it more smooth when entering the shell and improving the assembly processability. In addition, by defining the relevant dimensions of the volume of the support boss and the volume of the avoidance groove, it not only ensures that the support boss has sufficient contact area with the pole post bottom plate to avoid poor welding, but also ensures that the avoidance groove has sufficient space to accommodate the deformed protrusion after the support boss is heated and deformed.

[0021] The present invention also provides a battery. By applying the above battery cover plate, not only the probability of short circuit is reduced and the product quality is improved, but also due to the improvement of the assembly processability, the assembly speed is greatly increased, the assembly cycle is shortened, and the production capacity is improved. Description of the Drawings

[0022] Figure 1 is the structural exploded view of the battery cover plate provided by the present invention;

[0023] Figure 2 is the bottom plan view of the battery cover plate provided by the present invention;

[0024] Figure 3 is the structural schematic diagram of the conductive pole post in the battery cover plate provided by the present invention;

[0025] Figure 4 is the structural schematic diagram of the insulating part in the battery cover plate provided by the present invention;

[0026] Figure 5 is Figure 4 the enlarged structural view of part Z therein;

[0027] Figure 6 is the bottom plan view of the insulating part in the battery cover plate provided by the present invention;

[0028] Figure 7 is Figure 6 the structural cross-sectional view along the I-I direction.

[0029] In the figure:

[0030] 100, pole ear; 200, welding mark;

[0031] 1. Conductive electrode post; 11. Post body; 12. Post base plate; 121. First connecting plate; 122. Second connecting plate; 123. Fuse insurance plate; 124. Blocking through groove; 13. Insulating rubber sleeve;

[0032] 2. Insulating part; 21. Insertion through hole; 22. Accommodating groove; 221. Supporting boss; 222. Avoidance groove; 223. First wall surface; 224. Second wall surface; 225. Third wall surface; 226. Limiting protrusion;

[0033] 3. Cover plate body. Detailed implementation manners

[0034] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. Additionally, it should be noted that for the convenience of description, only parts related to the present invention are shown in the drawings rather than all the structures.

[0035] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "above the", and "on the" second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below the", and "under the" second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0037] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meanings.

[0038] Since the plastic part is arranged between the pole post and the light aluminum plate, when the tab and the pole post are connected by welding, the high temperature generated causes the plastic part to be deformed by heat and extend horizontally. This not only reduces the thickness of the plastic part, increases the probability of the plastic part being punctured and causing a short circuit, has a relatively high risk, and has poor insulation protection, but also since the plastic part extends horizontally after being heated, it will increase the outer dimension of the battery cover plate, resulting in difficulty in shelling and poor assembly processability.

[0039] Therefore, in order to reduce the thermal influence on the plastic part during welding and improve the insulation protection and assembly processability of the plastic part, this embodiment provides a battery cover plate.

[0040] As Figures 1 to 7 shown, the battery cover plate includes a conductive pole post 1 and an insulating part 2. The conductive pole post 1 includes a pole post main body 11 and a pole post bottom plate 12. The pole post main body 11 is connected to the pole post bottom plate 12. The side of the pole post bottom plate 12 facing away from the pole post main body 11 is welded to the tab 100. The insulating part 2 is provided with an insertion through hole 21 for the pole post main body 11 to pass through and a receiving groove 22 for receiving the pole post bottom plate 12. A support boss 221 protruding in the direction close to the pole post bottom plate 12 is provided in the receiving groove 22, and an avoidance groove 222 is formed between the support boss 221 and the inner side wall of the receiving groove 22;

[0041] The area size of the support boss 221 is S1, the area size of the avoidance groove 222 is S2, the height size of the support boss 221 in the first direction is L, the depth size of the avoidance groove 222 in the first direction is F, and 0.5 < (S1 × L) / (S2 × F) ≤ 1 is satisfied.

[0042] The battery cover plate is configured by providing a support boss 221 that protrudes in the direction close to the pole plate 12 within the receiving groove 22 of the insulating member 2, and forming a relief groove 222 between the support boss 221 and the inner side wall of the receiving groove 22. On the one hand, the material thickness of the contact area between the insulating member 2 and the pole plate 12 is thickened, thereby avoiding the reduction in thickness due to the thermal melting deformation of the contact area between the insulating member 2 and the pole plate 12 caused by the influence during the welding of the pole tab 100 and the pole, increasing the probability of breakdown and short circuit, and improving the insulation protection performance. On the other hand, by using the formed relief groove 222, when the support boss 221 deforms in the horizontal direction due to thermal influence, the relief groove 222 is used to accommodate the protruding part after deformation, thus avoiding the increase in the outer dimension of the battery cover plate, making it smoother during shell insertion and improving the assembly processability. In addition, by limiting the relevant dimensions of the volume of the support boss 221 and the volume of the relief groove 222, it is ensured that the support boss 221 has sufficient contact area with the pole plate 12 to avoid poor welding, and at the same time, the relief groove 222 has sufficient space to accommodate the deformed protrusion of the support boss 221 after thermal deformation.

[0043] The shape of the support boss 221 can be freely set according to requirements, such as circular, rectangular or oval, etc. The shapes of the relief grooves 222 formed between the support bosses 221 of different shapes and the receiving groove 22 are also different. In this embodiment, the cross-sectional shapes of the support boss 221 and the receiving groove 22 are both rectangular. Therefore, the relief groove 222 is composed of three mutually connected rectangular grooves. In addition, the shape of the welding mark 200 for welding the pole tab 100 and the pole plate 12 can be freely set according to requirements. In this embodiment, a strip-shaped welding mark 200 is used to realize the welding of the pole tab 100 and the pole plate 12.

[0044] Among them, the battery cover plate can be applied to different battery types, such as blade batteries, square shell batteries, large cylindrical batteries, etc. In this embodiment, the battery cover plate is adapted to blade batteries.

[0045] Optionally, as Figure 7 shown, the height dimension L of the support boss 221 in the first direction satisfies 0.15 mm ≤ L < F. By limiting the height dimension L of the support boss 221 in the first direction to satisfy 0.15 mm ≤ L < F, on the one hand, it is ensured that the support boss 221 has sufficient thickness, so that even if a part is melted, it still has sufficient thickness for insulation. On the other hand, it is avoided that the support boss 221 protrudes from the receiving groove 22, resulting in the inability to accommodate in the receiving groove 22 after the pole plate 12 abuts against the support boss 221.

[0046] Optionally, as Figure 7As shown, the depth dimension F of the avoidance groove 222 in the first direction satisfies 0.3 mm ≤ F ≤ 0.5 mm. By defining the depth dimension F of the avoidance groove 222 in the first direction to satisfy 0.3 mm ≤ F ≤ 0.5 mm, on the one hand, it is avoided that the depth of the avoidance groove 222 is too small, resulting in too small a space for accommodating the support boss 221. On the other hand, it is avoided that the depth of the avoidance groove 222 is too large, resulting in too small a material thickness at the position where the insulating part 2 is provided with the avoidance groove 222, and the area of the insulating part 2 provided with the avoidance groove 222 is easily broken down by current, causing a short circuit.

[0047] Among them, the depth dimension F of the avoidance groove 222 in the first direction can be any value between 0.3 mm and 0.5 mm or the range between any two values, such as 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, etc.

[0048] Optionally, as Figure 3 and Figure 5 shown, the accommodating groove 22 includes a first wall surface 223 opposite to the pole post bottom plate 12 in the first direction, a second wall surface 224 opposite to the pole post bottom plate 12 in the second direction, and a third wall surface 225 opposite to the pole post bottom plate 12 in the third direction. The support boss 221 is provided on the first wall surface 223, and a limiting protrusion 226 in contact with the pole post bottom plate 12 is provided on the second wall surface 224. By providing the limiting protrusion 226 in contact with the pole post bottom plate 12 on the second wall surface 224, the position of the pole post bottom plate 12 is limited and fixed, and it is avoided that the pole post bottom plate 12 is misaligned during the welding of the pole post bottom plate 12 and the pole ear 100, resulting in poor welding.

[0049] Optionally, as Figure 2 、 Figure 3 、 Figure 5 shown, the gap dimension W in the second direction between the surface of the pole post bottom plate 12 in contact with the limiting protrusion 226 and the second wall surface 224 satisfies 0.3 mm ≤ W ≤ 0.5 mm. By defining the gap dimension W in the second direction between the surface of the pole post bottom plate 12 in contact with the limiting protrusion 226 and the second wall surface 224 to satisfy 0.3 mm ≤ W ≤ 0.5 mm, on the one hand, it is avoided that the gap between the pole post bottom plate 12 and the second wall surface 224 is too small, resulting in a thermal effect on the second wall surface 224 during the welding of the pole post bottom plate 12 and the pole ear 100. On the other hand, it is avoided that the gap between the pole post bottom plate 12 and the second wall surface 224 is too large, so that on the premise of ensuring the thickness of the second wall surface 224 remains unchanged, the outer dimension of the insulating part 2 increases, and then the outer dimension of the battery cover plate increases, increasing the difficulty of shelling.

[0050] Among them, the clearance dimension W in the second direction between the surface of the terminal post base plate 12 in contact with the limit protrusion 226 and the second wall surface 224 can be any value between 0.3 mm and 0.5 mm or the range between any two values, such as 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, etc.

[0051] Among them, in order to verify the relationship between the area dimension S1 of the support boss 221, the area dimension S2 of the avoidance groove 222, the height dimension L of the support boss 221 in the first direction, and the depth dimension F of the avoidance groove 222 in the first direction, regarding the thermal influence on the insulating part 2 when the tab 100 is welded to the terminal post base plate 12, as shown in Table 1, six groups of embodiments and four groups of comparative examples are provided for verification.

[0052] Table 1

[0053]

[0054] As can be seen from Embodiments 1 to 6 in Table 1, when the relationship between the area dimension S1 of the support boss 221, the area dimension S2 of the avoidance groove 222, the height dimension L of the support boss 221 in the first direction, and the depth dimension F of the avoidance groove 222 in the first direction satisfies the proportional relationship of 0.5 < (S1 × L) / (S2 × F) ≤ 1, at this time, the avoidance groove 222 not only has enough space to accommodate the protruding part of the support boss 221 after thermal deformation, but also ensures that there is enough support area between the support boss 221 and the terminal post base plate 12 to ensure the support force during welding and avoid problems of poor welding.

[0055] As can be seen from Comparative Examples 1 and 2 in Table 1, when the relationship between the area dimension S1 of the support boss 221, the area dimension S2 of the avoidance groove 222, the height dimension L of the support boss 221 in the first direction, and the depth dimension F of the avoidance groove 222 in the first direction is less than the minimum value of 0.5 < (S1 × L) / (S2 × F) ≤ 1, at this time, the support area between the support boss 221 and the terminal post base plate 12 is too small, resulting in insufficient support force for the terminal post base plate 12 during welding and causing problems of poor welding.

[0056] As can be seen from Comparative Examples 3 and 4 in Table 1, when the relationship between the area dimension S1 of the support boss 221, the area dimension S2 of the avoidance groove 222, the height dimension L of the support boss 221 in the first direction, and the depth dimension F of the avoidance groove 222 in the first direction is greater than the maximum value of 0.5 < (S1 × L) / (S2 × F) ≤ 1, at this time, the space for the avoidance groove 222 to accommodate the protruding part of the support boss 221 after thermal deformation is too small, resulting in the avoidance groove 222 being unable to completely accommodate the protruding part of the support boss 221 after deformation, and the external dimension of the insulating part 2 changes, making it difficult to insert into the shell.

[0057] Optionally, the battery cover plate further includes a cover plate body 3, an insulating member 2 is disposed between the cover plate body 3 and the pole post bottom plate 12, and the thickness in the first direction between the surface of the insulating member 2 in contact with the cover plate body 3 and the first wall surface 223 is not less than 0.5 mm. By making the thickness in the first direction between the surface of the insulating member 2 in contact with the cover plate body 3 and the first wall surface 223 not less than 0.5 mm, it is avoided that the material thickness between the surface of the insulating member 2 in contact with the cover plate body 3 and the first wall surface 223 is too small, resulting in the insulating member 2 being easily broken down by current and causing a short circuit.

[0058] Optionally, as Figure 3 shown, the pole post bottom plate 12 includes a first connecting plate 121, a second connecting plate 122 and a fusing fuse plate 123. The fusing fuse plate 123 is disposed between the first connecting plate 121 and the second connecting plate 122. The pole post body 11 is connected to the first connecting plate 121, and the side of the second connecting plate 122 facing away from the pole post body 11 is connected to the pole ear 100. By forming the pole post bottom plate 12 with the first connecting plate 121, the second connecting plate 122 and the fusing fuse plate 123, when a short circuit occurs, the fusing fuse plate 123 is melted by the generated high temperature, so that the pole post body 11 connected to the first connecting plate 121 is disconnected from the pole ear 100 connected to the second connecting plate 122, thereby improving the safety protection performance. And since the first connecting plate 121 and the second connecting plate 122 are connected through the fusing fuse plate 123, its heat conduction ability has a smaller heat dissipation area and worse heat conduction ability compared with the pole post bottom plate 12 formed by an integral metal plate. Therefore, by setting the support boss 221 and providing an avoidance groove 222 between the support boss 221 and the receiving groove 22 bracket, the avoidance groove 222 is used to accommodate the raised part of the support boss 221 after thermal deformation, avoiding an increase in the outer dimension of the insulating member 2, making the shell insertion smoother, and improving the assembly processability.

[0059] Optionally, as Figure 3 shown, a blocking through groove 124 is formed on the fusing fuse plate 123. By forming the blocking through groove 124 on the fusing fuse plate 123, the cross-sectional area on the fusing fuse plate 123 is reduced, so that when a short circuit occurs, due to the smaller cross-section, the heat generation is accelerated, and thus the fusing is achieved in advance, and its protection performance is better. However, since the cross-sectional area of the fusing fuse plate 123 is smaller after the blocking through groove 124 is formed, it is more necessary to set the support boss 221 and provide an avoidance groove 222 between the support boss 221 and the receiving groove 22 bracket, so that the avoidance groove 222 is used to accommodate the raised part of the support boss 221 after thermal deformation, avoiding an increase in the outer dimension of the insulating member 2, making the shell insertion smoother, and improving the assembly processability.

[0060] Optionally, as Figure 3As shown, the conductive electrode post 1 further includes an insulating rubber sleeve 13, and the insulating rubber sleeve 13 is disposed outside the fuse insurance plate 123. By providing the insulating rubber sleeve 13 outside the fuse insurance plate 123, on the one hand, it plays an insulating protection role to avoid the arcing phenomenon due to the too small gap between the first connecting plate 121 and the second connecting plate 122. On the other hand, when a short circuit occurs, since the insulating rubber sleeve 13 is disposed outside the fuse insurance plate 123, it can avoid the residue after the fuse insurance plate 123 melts from falling into the battery interior and causing damage.

[0061] In this embodiment, a battery is further provided. The battery includes a pole group, a battery housing, and the above-mentioned battery cover plate. The battery housing is a cavity structure with an open mouth, and the battery cover plate is disposed at the open mouth of the battery housing to close the battery housing and form a receiving cavity for accommodating the pole group. By applying the above-mentioned battery cover plate, the battery not only reduces the probability of short circuit and improves the product quality, but also greatly improves the assembly speed, shortens the assembly cycle, and improves the production capacity due to the improvement of the assembly processability.

[0062] Obviously, the above-mentioned embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments, and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. Battery cover plate, characterized in that The battery cover comprises: A conductive electrode column, the conductive electrode column comprising a pole body and a pole bottom plate, the pole body being connected to the pole bottom plate, and a side of the pole bottom plate facing away from the pole body being welded to a pole ear; An insulating member, wherein the insulating member is provided with a plug-in through hole for the pole body to pass through and a receiving groove for accommodating the pole bottom plate, wherein the receiving groove is provided with a supporting boss protruding in a direction close to the pole bottom plate, and a avoiding groove is formed between the supporting boss and the inner side wall of the receiving groove; The area dimension of the support boss is S1, the area dimension of the avoidance groove is S2, the height dimension of the support boss along the first direction is L, the depth dimension of the avoidance groove along the first direction is F, and 0.5<(S1×L) / (S2×F)≤1 is satisfied.

2. The battery cover plate according to claim 1, characterized in that, A height dimension L of the supporting boss along the first direction satisfies 0.15 mm ≤ L < F.

3. The battery cover plate according to claim 1, wherein, A depth dimension F of the avoidance groove along the first direction satisfies 0.3 mm ≤ F ≤ 0.5 mm.

4. The battery cover plate according to claim 1, wherein, The accommodating groove includes a first wall surface opposite to the pole bottom plate along the first direction, a second wall surface opposite to the pole bottom plate along the second direction, and a third wall surface opposite to the pole bottom plate along the third direction. The supporting boss is arranged on the first wall surface, and a limiting protrusion abutting against the pole bottom plate is provided on the second wall surface.

5. The battery cover plate according to claim 4, wherein, A gap size between the surface of the pole bottom plate abutting against the limiting protrusion and the second wall surface along the second direction is W, and satisfies 0.3 mm≤W≤0.5 mm.

6. The battery cover plate according to claim 4, characterized in that, The battery cover also includes a cover body, the insulating member is arranged between the cover body and the pole bottom plate, and the thickness along the first direction between the surface where the insulating member abuts against the cover body and the first wall surface is not less than 0.5 mm.

7. The battery cover plate according to claim 1, wherein, The pole bottom plate includes a first connecting plate, a second connecting plate and a fuse plate, wherein the fuse plate is arranged between the first connecting plate and the second connecting plate, the pole body is connected to the first connecting plate, and the second connecting plate is connected to the pole ear on a side away from the pole body.

8. The battery cover plate according to claim 7, wherein, The fuse plate is provided with a blocking slot (124).

9. The battery cover plate according to claim 7, wherein, The conductive electrode column also includes an insulating rubber sleeve, and the insulating rubber sleeve is arranged on the outer side of the fuse plate.

10. A battery, characterized in that, The battery comprises a pole group, a battery shell and a battery cover as described in any one of claims 1 to 9, wherein the battery shell is a cavity structure with an opening, and the battery cover is arranged at the opening of the battery shell to close the battery shell to form a receiving cavity for accommodating the pole group.

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