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, a first insulating part and a cover plate body, the conductive pole comprises a pole main body and a pole bottom plate, the first insulating part is provided with an insertion through hole and a containing groove, and the insertion through hole is communicated with the containing groove; the containing groove comprises a first wall face opposite to the pole bottom plate in the first direction, at least one avoiding through hole is formed in the first wall face, the cover plate body is arranged on the side, away from the conductive pole, of the first insulating part, and supporting bosses in one-to-one correspondence with the avoiding through holes are arranged on the side, facing the first insulating part, of the cover plate body. The supporting boss penetrates through the avoiding through hole and is in insulation contact with the pole bottom plate, so that a heat insulation gap is formed between the first wall surface and the pole bottom plate. On one hand, the first insulating part is prevented from being in direct contact with the pole bottom plate welded with the pole lug, and on the other hand, an air interlayer is formed between the first insulating part and the pole bottom plate by utilizing the heat insulation gap, so that the heat influence on the first insulating part during welding of the pole lug and the pole bottom plate is reduced.

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 plate and a battery with strong insulation protection and good 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 is connected to the pole bottom plate, and the pole bottom plate is welded to the pole ear;

[0008] A first insulating member, wherein the first insulating member is provided with a plug-in through hole plugged into the pole body and a receiving groove for accommodating the pole bottom plate, the receiving groove comprising a first wall surface opposite to the pole bottom plate along a first direction, and at least one avoidance through hole is provided on the first wall surface;

[0009] A cover plate body, the cover plate body being arranged on a side of the first insulating member away from the pole bottom plate, the cover plate body being arranged on a side facing the first insulating member with support bosses corresponding to the avoidance through holes one by one, the support bosses passing through the avoidance through holes and insulated contact with the pole bottom plate, so as to form a heat insulation gap between the first wall surface and the pole bottom plate;

[0010] The dimension of the thermal insulation gap along the first direction is N, and satisfies N≥2 mm.

[0011] Optionally, the total area of the support boss projected on the pole bottom plate along the first direction is S1, and a contact area for abutting against the support boss is provided on the surface of the pole bottom plate facing the first insulating member, the area of the contact area is S, and satisfies 0.1≤S1 / S≤0.4.

[0012] Optionally, the pole bottom plate includes a first connecting plate, a second connecting plate and a fuse structure, the first connecting plate is connected to the pole body, the second connecting plate is welded to the pole ear on a side away from the first insulating member, and the fuse structure is arranged between the first connecting plate and the second connecting plate.

[0013] Optionally, the length dimension of the second connecting plate from the boundary of the fuse structure to the center point of the fuse structure along the second direction is F, the length of the center point of the supporting boss to the center point of the fuse structure along the second direction is L, and L / F>0.5 is satisfied.

[0014] Optionally, a blocking groove is provided on the fuse structure.

[0015] Optionally, the conductive electrode column further includes an insulating rubber sleeve, and the insulating rubber sleeve is arranged outside the fuse structure.

[0016] Optionally, the first connecting plate, the second connecting plate and the fuse structure are all accommodated in the accommodating groove, and the accommodating groove also includes two second walls arranged opposite to the pole bottom plate along a third direction, and the supporting boss includes two width boundaries close to the second walls, and the spacing dimension of the two width boundaries along the third direction is W, and the spacing dimension of the two second walls along the third direction is M, and 0.4≤W / M≤0.7 is satisfied.

[0017] Optionally, a plurality of limiting protrusions abutting against the pole bottom plate are symmetrically distributed on the second wall surface, and the number of the limiting protrusions abutting against the first connecting plate on each second wall surface is greater than the number of the limiting protrusions abutting against the second connecting plate.

[0018] Optionally, the battery cover plate further includes an insulating patch, and the insulating patch is arranged between the supporting boss and the pole bottom plate.

[0019] 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.

[0020] Advantages of the present invention:

[0021] The present invention provides a battery cover plate. By providing an avoidance through-hole in the accommodation groove of the first insulating member and providing a support boss on the cover plate body that passes through the avoidance through-hole and is in insulating contact with the pole plate, a heat insulation gap is formed between the first wall surface and the pole plate. On the one hand, it avoids the direct contact between the first insulating member and the pole plate welded to the tab. On the other hand, an air isolation layer is formed between the first insulating member and the pole plate by using the heat insulation gap, thereby reducing the thermal influence of the tab and the pole plate on the first insulating member during welding, avoiding the deformation of the first insulating member due to high temperature, improving the insulation performance and assembly processability, and by limiting the size N of the heat insulation gap in the first direction to satisfy N≥2mm, the too small gap and poor heat insulation effect are avoided.

[0022] The present invention also provides a battery. By applying the above battery cover plate, the probability of short circuit is reduced, thereby improving the product quality. Moreover, 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

[0023] Figure 1 is an exploded view of the structure of the battery cover plate provided by the present invention;

[0024] Figure 2 is a partial front cross-sectional view of the battery cover plate provided by the present invention;

[0025] Figure 3 is a side cross-sectional view of the battery cover plate provided by the present invention;

[0026] Figure 4 is a plan view of the bottom of the battery cover plate provided by the present invention;

[0027] Figure 5 is a schematic structural view of the battery cover plate provided by the present invention when a single support boss is provided;

[0028] Figure 6 is a schematic structural view of the battery cover plate provided by the present invention when multiple support bosses are provided;

[0029] Figure 7 is a schematic structural view of the conductive pole column in the battery cover plate provided by the present invention;

[0030] Figure 8 is a partial structural schematic view of the first insulating member in the battery cover plate provided by the present invention.

[0031] In the figure:

[0032] 1. Conductive electrode post; 11. Post body; 12. Post base plate; 121. First connecting plate; 122. Second connecting plate; 123. Fusing structure; 124. Blocking through slot; 13. Insulating rubber sleeve;

[0033] 2. First insulating member; 21. Insertion through hole; 22. Accommodating groove; 221. First wall surface; 222. Avoidance through hole; 223. Second wall surface; 224. Limiting protrusion;

[0034] 3. Cover plate body; 31. Support boss; 32. Connecting through hole;

[0035] 4. Second insulating member;

[0036] 5. Connecting block;

[0037] 6. Insulating patch. Detailed implementation manner

[0038] 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. In addition, it should be noted that, for the sake of description, only parts related to the present invention rather than all structures are shown in the drawings.

[0039] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. 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 situations.

[0040] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include 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 between them. Moreover, the first feature being "above", "above", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "below", "below", and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0041] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0042] Since the plastic part is arranged between the pole and the bare aluminum plate, when the pole ear and the pole are connected by welding, the high temperature generated causes the plastic part to be deformed by heat and extend in the horizontal direction, which not only reduces the thickness of the plastic part and increases the probability of the plastic part being punctured and causing a short circuit, posing a high risk and poor insulation protection, but also because the plastic part is heated and extended in the horizontal direction, the outer dimensions of the battery cover will increase, making it difficult to enter the shell and having poor assembly processability.

[0043] Therefore, in order to reduce the thermal impact on the plastic parts during welding and improve the insulation protection and assembly processability of the plastic parts, this embodiment provides a battery cover.

[0044] like Figures 1 to 8 As shown, the battery cover includes a conductive electrode 1, a first insulating member 2 and a cover body 3, the conductive electrode 1 includes a pole body 11 and a pole bottom plate 12, the pole body 11 is connected to the pole bottom plate 12, the pole bottom plate 12 is welded to the pole ear, the first insulating member 2 is provided with a plug-in through hole 21 plugged with the pole body 11 and a receiving groove 22 for accommodating the pole bottom plate 12, the receiving groove 22 includes a first wall 221 opposite to the pole bottom plate 12 along a first direction, and the first wall At least one avoidance through hole 222 is provided on the surface 221, the cover body 3 is arranged on the side of the first insulating member 2 away from the pole bottom plate 12, and the side of the cover body 3 facing the first insulating member 2 is provided with a support boss 31 corresponding to the avoidance through hole 222 one by one, and the support boss 31 passes through the avoidance through hole 222 and is insulated from the pole bottom plate 12 to form a thermal insulation gap between the first wall 221 and the pole bottom plate 12, and the size of the thermal insulation gap along the first direction is N, and satisfies N≥2mm.

[0045] The battery cover plate forms a heat-insulating gap between the first wall surface 221 and the pole bottom plate 12 by opening a avoidance through hole 222 in the accommodating groove 22 of the first insulating member 2, and arranging a supporting boss 31 on the cover plate body 3 that passes through the avoidance through hole 222 and is insulated from the pole bottom plate 12. On the one hand, it avoids the first insulating member 2 from directly contacting the pole bottom plate 12 welded to the pole ear. On the other hand, it utilizes the heat-insulating gap to form an air barrier between the first insulating member 2 and the pole bottom plate 12, thereby reducing the thermal influence of the pole ear and the pole bottom plate 12 on the first insulating member 2 during welding, avoiding deformation of the first insulating member 2 due to high temperature, improving the insulation performance and assembly processability, and limiting the dimension N of the heat-insulating gap along the first direction to satisfy N≥2mm, thereby avoiding the gap being too small and the heat-insulating effect being poor.

[0046] The shape of the supporting boss 31 can be freely set according to the needs, such as round, strip, square, etc. In this embodiment, the supporting boss 31 is a long strip, and the arrangement method thereof varies according to the number of supporting bosses 31. When there is only one supporting boss 31, such as Figure 5 As shown, the length direction of the support boss 31 is parallel to the third direction. When a plurality of support bosses 31 are provided, as shown in FIG. Figure 6 As shown, a plurality of support bosses 31 are distributed at equal intervals along the third direction, and at this time, the length direction of the support bosses 31 is parallel to the second direction.

[0047] In this embodiment, if Figure 1 As shown, the battery cover also includes a second insulating member 4 and a connecting block 5. A connecting through hole 32 corresponding to the plug-in through hole 21 is provided on the cover body 3. One end of the pole body 11 passes through the plug-in through hole 21 and is inserted into the connecting through hole 32 to be connected to the connecting block 5. The second insulating member 4 is arranged on the side of the cover body 3 away from the first insulating member 2, and is used to achieve insulation protection among the cover body 3, the pole body 11 and the connecting block 5. In addition, in order to ensure the firmness of the connection between the first insulating member 2 and the cover body 3, the first insulating member 2 is provided with a positioning protrusion on the outside of the plug-in through hole 21, and a positioning through hole adapted to the positioning protrusion is provided on the cover body 3, and the positioning protrusion is inserted in the positioning through hole.

[0048] The battery cover can be a welded cover or a riveted cover. When the battery cover is a welded cover, the connection block 5 is welded to the pole body 11. When the battery cover is a riveted cover, the connection block 5 is riveted to the pole body 11. The battery cover of this structure can be adapted to different types of batteries by changing the number of conductive electrode columns 1. When one conductive electrode column 1 is provided on the battery cover, the battery cover is adapted to blade batteries. When two conductive electrode columns 1 are provided on the battery cover, the battery cover is adapted to square shell batteries.

[0049] Optionally, as shown in Figure 4 , Figure 5 , Figure 6 , the total projected area of the support boss 31 on the pole base plate 12 in the first direction is S1. A contact area for abutting against the support boss 31 is provided on the surface of the pole base plate 12 facing the first insulating member 2. The area of the contact area is S, and 0.1 ≤ S1 / S ≤ 0.4 is satisfied. By limiting the total projected area S1 of the support boss 31 on the pole base plate 12 in the first direction and the area S of the contact area on the pole base plate 12, on the one hand, it is avoided that the contact area between the support boss 31 and the pole base plate 12 is too small, resulting in insufficient support force, causing the pole base plate 12 to deflect and skew, leading to problems such as poor welding. On the other hand, it is avoided that the contact area between the support boss 31 and the pole base plate 12 is too large, resulting in the support boss 31 occupying more space in the air gap between the pole base plate 12 and the first insulating member 2, thereby reducing the heat insulation effect.

[0050] In this embodiment, the length dimension of the contact area in the second direction is H2, and the length dimension in the third direction is H1. The area S of the contact area = H1 × H2.

[0051] Optionally, the pole base plate 12 includes a first connecting plate 121, a second connecting plate 122, and a fusing structure 123. The first connecting plate 121 is connected to the pole body 11, and the second connecting plate 122 is welded to the pole ear on the side facing away from the first insulating member 2. The fusing structure 123 is provided between the first connecting plate 121 and the second connecting plate 122.

[0052] The pole base plate 12 is formed by the first connecting plate 121, the second connecting plate 122, and the fusing structure 123. When a short circuit occurs, the fusing structure 123 is melted by the generated high temperature, realizing the disconnection between the pole body 11 connected to the first connecting plate 121 and the pole ear connected to the second connecting plate 122, thereby improving the safety protection performance. And because the first connecting plate 121 and the second connecting plate 122 are connected through the fusing structure 123, its heat conduction ability has a smaller heat dissipation area and worse heat conduction ability compared with the pole base plate 12 composed of an integral metal plate. Therefore, it is more necessary to use the support boss 31 provided on the cover body 3 to be in insulating contact with the pole base plate 12 through the avoidance through hole 222, so as to form a heat insulation gap between the first wall surface 221 and the pole base plate 12. On the one hand, it avoids the first insulating member 2 directly contacting the pole base plate 12 welded to the pole ear. On the other hand, an air gap is formed between the first insulating member 2 and the pole base plate 12 by using the heat insulation gap, thereby reducing the thermal influence of the welding between the pole ear and the pole base plate 12 on the first insulating member 2, avoiding the deformation of the first insulating member 2 due to high temperature, and improving the insulation performance and assembly processability.

[0053] In this embodiment, the conductive electrode post 1 provided with the fusing structure 123 is generally the positive electrode post. Since the negative tab is generally made of copper, the negative electrode post connected to the negative tab is generally also made of copper. The copper material has a higher thermal conductivity, so there is no need to set the fusing structure 123 on the negative electrode post, which can avoid wasting resources and reduce the manufacturing cost. In order to prevent the fusing structure 123 from melting when welding the tab and the electrode post base plate 12, the melting point of the fusing structure 123 is higher than the temperature during the welding of the tab and the electrode post base plate 12 and not higher than the temperature during a short circuit.

[0054] Optionally, the length dimension in the second direction between the boundary of the second connecting plate 122 facing away from the fusing structure 123 and the center point of the fusing structure 123 is F, and the length in the second direction between the center point of the support boss 31 and the center point of the fusing structure 123 is L, and L / F > 0.5 is satisfied.

[0055] Since the conductive electrode post 1 is an eccentric structure, by limiting the ratio between the length dimension F in the second direction between the boundary of the second connecting plate 122 facing away from the fusing structure 123 and the center point of the fusing structure 123 and the length L in the second direction between the center point of the support boss 31 and the center point of the fusing structure 123, so that L / F > 0.5 is satisfied, the overall structure is more balanced in force in the second direction.

[0056] Optionally, as Figure 7 shown, a blocking through groove 124 is formed in the fusing structure 123. By forming the blocking through groove 124 in the fusing structure 123, the cross-sectional area of the fusing structure 123 is reduced, so that during a short circuit, due to the smaller cross-section, the heat generation is accelerated, and thus the early fusing is realized, and its protection performance is better. However, since the cross-sectional area of the fusing structure 123 is smaller after the blocking through groove 124 is formed, it is more necessary to use the support boss 31 to form an air isolation layer between the first insulating member 2 and the second connecting plate 122 to reduce the thermal influence of the high temperature generated during the welding of the second connecting plate 122 and the tab on the first insulating member 2.

[0057] Optionally, as Figure 1 shown, the conductive electrode post 1 further includes an insulating rubber sleeve 13, and the insulating rubber sleeve 13 is arranged outside the fusing structure 123. By arranging the insulating rubber sleeve 13 outside the fusing structure 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, during a short circuit, since the insulating rubber sleeve 13 is arranged outside the fusing structure 123, the residue after the fusing structure 123 melts is prevented from falling into the battery interior and causing damage.

[0058] Among them, in order to verify the influence of the relationship between the total area S1 of the projection of the supporting boss 31 on the pole bottom plate 12 in the first direction and the area S of the contact area on the pole bottom plate 12 on the supporting stability and heat insulation effect, as shown in Table 1, six sets of embodiments and three sets of comparative examples are provided for verification. Among them, the conducting pole 1 is the positive pole column welded to the positive ear. A fusing structure 123 is provided on the pole bottom plate 12 of the conducting pole 1. The material of the first insulating member 2 in contact with the pole bottom plate 12 is the industry general material PP (melting point temperature 160°C - 170°C), and the welding power of the ear and the pole bottom plate 12 is 1000W.

[0059] Table 1

[0060]

[0061] It can be seen from Embodiments 1 to 6 in Table 1 that when the relationship between the total area S1 of the projection of the supporting boss 31 on the second connecting plate 122 in the first direction and the area S of the surface of the second connecting plate 122 in contact with the supporting boss 31 satisfies the range of 0.1 ≤ S1 / S ≤ 0.4, it ensures that the supporting boss 31 has sufficient supporting area and avoids the excessive space occupied by the supporting boss 31, reducing the heat insulation effect of the air interlayer. After welding, there are no hot melting marks on the first insulating member 2, and the welding between the ear and the second connecting plate 122 does not show poor welding.

[0062] It can be seen from Comparative Examples 1 to 2 in Table 1 that when the relationship between the total area S1 of the projection of the supporting boss 31 on the second connecting plate 122 in the first direction and the area S of the surface of the second connecting plate 122 in contact with the supporting boss 31 is less than the minimum value of 0.1 ≤ S1 / S ≤ 0.4, the contact area between the supporting boss 31 and the second connecting plate 122 is too small, resulting in insufficient supporting force, causing the second connecting plate 122 to deflect and skew, leading to the problem of poor welding.

[0063] It can be seen from Comparative Example 3 in Table 1 that when the relationship between the total area S1 of the projection of the supporting boss 31 on the second connecting plate 122 in the first direction and the area S of the surface of the second connecting plate 122 in contact with the supporting boss 31 is greater than the maximum value of 0.1 ≤ S1 / S ≤ 0.4, the contact area between the supporting boss 31 and the second connecting plate 122 is too large, resulting in the supporting boss 31 occupying more space in the air interlayer between the second connecting plate 122 and the first insulating member 2, causing the heat insulation effect to decline, and finally causing the first insulating member 2 to melt due to high temperature.

[0064] Optionally, as Figure 5 、 Figure 6As shown, the first connecting plate 121, the second connecting plate 122, and the fusing structure 123 are all accommodated in the accommodating groove 22. The accommodating groove 22 further includes two second wall surfaces 223 oppositely arranged along the third direction with respect to the pole column base plate 12. The supporting boss 31 includes two width boundaries close to the second wall surfaces 223. The distance dimension between the two width boundaries along the third direction is W, and the distance dimension between the two second wall surfaces 223 along the third direction is M, and 0.4 ≤ W / M ≤ 0.7 is satisfied. By defining the ratio between the distance dimension W of the two width boundaries of the supporting boss 31 along the third direction and the distance dimension M of the two second wall surfaces 223 along the third direction, such that 0.4 ≤ W / M ≤ 0.7, the overall structure is made to be more balanced in the third direction.

[0065] In this embodiment, since there is only one supporting boss 31, the length direction of the supporting boss 31 is parallel to the third direction. When there are multiple supporting bosses 31, the multiple supporting bosses 31 are equally spaced along the third direction, and at this time the length direction of the supporting boss 31 is parallel to the second direction. Therefore, when there is only one supporting boss 31, as Figure 5 shown, the width boundaries are the two end faces of the supporting boss 31 along the third direction. When there are multiple supporting bosses 31, as Figure 6 shown, the width boundaries are the surfaces of the outermost two supporting bosses 31 facing away from each other.

[0066] Optionally, as Figure 8 shown, a plurality of limiting protrusions 224 in contact with the pole column base plate 12 are symmetrically distributed on the second wall surface 223. By providing the limiting protrusions 224 in contact with the pole column base plate 12 on the second wall surface 223, the position of the pole column base plate 12 is limited and fixed, avoiding the problem that the pole column base plate 12 moves out of place during the welding of the pole column base plate 12 and the pole ear, resulting in poor welding.

[0067] In this embodiment, since the pole column base plate 12 includes the first connecting plate 121 and the second connecting plate 122, it is necessary to provide limiting protrusions 224 in contact with the first connecting plate 121 and the second connecting plate 122 respectively on the second wall surface 223 to ensure the firmness of the fixation with the pole column base plate 12. The number of limiting protrusions 224 provided on a single second wall surface 223 can be freely selected according to requirements. For example, in this embodiment, three limiting protrusions 224 are provided on each second wall surface 223 in contact with the first connecting plate 121, and one limiting protrusion 224 is provided in contact with the second connecting plate 122.

[0068] Optionally, as Figure 8As shown, the number of the limiting protrusions 224 on each second wall surface 223 that abut against the first connection plate 121 is greater than the number of the limiting protrusions 224 that abut against the second connection plate 122. The reason why the number of the limiting protrusions 224 that abut against the first connection plate 121 is greater than the number of the limiting protrusions 224 that abut against the second connection plate 122 is that the temperature of the first connection plate 121 is lower than that of the second connection plate 122. Therefore, it is avoided that the limiting protrusions 224 are melted by heat, resulting in ineffective fixation of the pole column bottom plate 12.

[0069] Optionally, as Figure 1 shown, the battery cover plate further includes an insulating patch 6, and the insulating patch 6 is arranged between the support boss 31 and the second connection plate 122. By arranging the insulating patch 6 between the support boss 31 and the second connection plate 122, the insulating contact between the support boss 31 and the second connection plate 122 is realized. In this embodiment, the material of the insulating patch 6 is PC / PBT / ABS, etc.

[0070] In this embodiment, a battery is further provided. The battery includes a battery cell group, a battery housing, and the above-mentioned battery cover plate. The battery housing is a cavity structure with an opening, and the battery cover plate is arranged at the opening of the battery housing to close the battery housing and form an accommodation cavity for accommodating the battery cell 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.

[0071] Obviously, the above-mentioned embodiments of the present invention are only examples for clearly explaining 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 is connected to the pole bottom plate, and the pole bottom plate is welded to the pole ear; A first insulating member, wherein the first insulating member is provided with a plug-in through hole plugged into the pole body and a receiving groove for accommodating the pole bottom plate, the receiving groove comprising a first wall surface opposite to the pole bottom plate along a first direction, and at least one avoidance through hole is provided on the first wall surface; A cover plate body, the cover plate body being arranged on a side of the first insulating member away from the pole bottom plate, the cover plate body being arranged on a side facing the first insulating member with support bosses corresponding to the avoidance through holes one by one, the support bosses passing through the avoidance through holes and insulated contact with the pole bottom plate, so as to form a heat insulation gap between the first wall surface and the pole bottom plate; The dimension of the thermal insulation gap along the first direction is N, and satisfies N≥2 mm.

2. The battery cover plate according to claim 1, characterized in that, The total area of the support boss projected on the pole bottom plate along the first direction is S1, and a contact area for abutting against the support boss is provided on the surface of the pole bottom plate facing the first insulating member, and the area of the contact area is S, and satisfies 0.1≤S1 / S≤0.

4.

3. 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 structure, the first connecting plate is connected to the pole body, the second connecting plate is welded to the pole ear on a side away from the first insulating member, and the fuse structure is arranged between the first connecting plate and the second connecting plate.

4. The battery cover plate according to claim 3, characterized in that, The length dimension of the second connecting plate from the boundary of the fuse structure to the center point of the fuse structure along the second direction is F, the length of the center point of the supporting boss to the center point of the fuse structure along the second direction is L, and L / F>0.5 is satisfied.

5. The battery cover plate according to claim 3, characterized in that, The fuse structure is provided with a blocking groove.

6. The battery cover plate according to claim 3, characterized in that The conductive electrode column also includes an insulating rubber sleeve, and the insulating rubber sleeve is arranged outside the fuse structure.

7. The battery cover plate according to claim 3, characterized in that, The first connecting plate, the second connecting plate and the fuse structure are all accommodated in the accommodating groove, and the accommodating groove also includes two second walls arranged opposite to the pole bottom plate along a third direction, and the supporting boss includes two width boundaries close to the second wall surfaces, and the spacing dimension of the two width boundaries along the third direction is W, and the spacing dimension of the two second walls along the third direction is M, and 0.4≤W / M≤0.7 is satisfied.

8. The battery cover plate according to claim 7, wherein, A plurality of limiting protrusions abutting against the pole bottom plate are symmetrically distributed on the second wall surface, and the number of the limiting protrusions abutting against the first connecting plate on each second wall surface is greater than the number of the limiting protrusions abutting against the second connecting plate.

9. The battery cover plate according to claim 1, characterized in that, The battery cover plate also includes an insulating patch, which is arranged between the supporting boss and the pole bottom 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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