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, a cover plate body and an insulating patch, the conductive pole comprises a pole main body and a pole bottom plate, the pole bottom plate is provided with a welding area welded with a tab, and the first insulating part is arranged in the welding area; an insertion through hole and an avoiding through groove opposite to the welding area are formed in the first insulating part, the projection of the welding area on the pole bottom plate is located in the projection of the avoiding through groove on the pole bottom plate, and the insulating patch is arranged on the cover plate body and is opposite to the avoiding through groove. By arranging the first insulating part on the cover plate body, the first insulating part is not in direct contact with the welding area where the pole bottom plate and the pole lug are welded, so that the heat influence on the first insulating part during welding is reduced, the first insulating part is prevented from hot melting deformation due to overhigh temperature, the insulating performance and the assembly manufacturability are improved, and meanwhile, the insulating patch is arranged on the cover plate body, so that the reliability of the cover plate is improved. The insulating patch is used for performing insulation protection on the area, exposed by the avoiding through groove, of the cover plate body, and the situation of short circuit is avoided.

Description

Technical Field

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

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

[0003] In order to prevent the direct contact between the conductive electrode post and the light aluminum plate from causing a short circuit, a plastic part for insulation is usually provided between the conductive electrode post and the light aluminum plate. However, when the conductive electrode post and the tab are connected by laser welding, the heat generated during the welding process will cause the temperature of the conductive electrode post to rise rapidly, resulting in an excessively high temperature of the conductive electrode post. A large amount of heat is transferred to the plastic part between the conductive electrode post and the light aluminum plate, causing the plastic part to be deformed and extended in the horizontal direction. This will not only increase the probability of the plastic part being penetrated due to the reduced thickness, having a high short-circuit risk and poor insulation protection, but also change the external dimensions of the battery cover plate due to the deformation of the plastic part, making it difficult to assemble the battery cover plate into the battery housing and resulting in poor assembly processability. Summary of the Invention

[0004] The purpose 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 purpose, the present invention adopts the following technical solutions:

[0006] On the one hand, a battery cover plate is provided, and the battery cover plate includes:

[0007] A conductive electrode post, the conductive electrode post includes a post main body and a post bottom plate, the post main body is connected to the post bottom plate, and a welding area for welding with a tab is provided on a side of the post bottom plate facing away from the post main body;

[0008] A first insulating member, a plugging through hole for plugging with the post main body and an avoidance through groove opposite to the welding area are formed on the first insulating member, and a projection of the welding area on the post bottom plate along a first direction is located within a projection of the avoidance through groove on the post bottom plate along the first direction;

[0009] A cover plate body, the cover plate body is provided on a side of the first insulating member facing away from the post bottom plate;

[0010] An insulating patch, the insulating patch is provided on a side of the cover plate body facing the first insulating member and is arranged opposite to the avoidance through groove;

[0011] A projection area of the welding zone on the pole bottom plate along the first direction is S1, a projection area of the avoidance groove on the pole bottom plate along the first direction is S2, and 0.4≤S1 / S2≤0.7 is satisfied.

[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 pole body, and the fuse structure is arranged between the first connecting plate and the second connecting plate.

[0013] Optionally, a projection area of the second connecting plate on the cover plate body along the first direction is S3, and satisfies 0.5≤S2 / S3≤0.65.

[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, a projection of the avoidance groove on the cover body along the first direction is located within a region where the insulating patch covers the cover body.

[0017] Optionally, a spacing dimension L between a boundary of the projection of the avoidance groove formed on the cover body along the first direction and an edge of the insulating patch satisfies 1.5 mm ≤ L ≤ 4 mm.

[0018] Optionally, a receiving groove is further provided on the first insulating member, and the first connecting plate, the second connecting plate and the fuse structure are all accommodated in the receiving groove. The receiving groove includes a first wall surface opposite to the pole bottom plate along the first direction, and the avoidance groove is provided on the first wall surface.

[0019] Optionally, the accommodating groove also includes two second wall surfaces opposite to the pole bottom plate along the second direction, and the two second wall surfaces are symmetrically provided with limiting protrusions abutting against the pole bottom plate, and the number of limiting protrusions abutting against the first connecting plate on each second wall surface is greater than the number of limiting protrusions abutting against the second connecting plate.

[0020] 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.

[0021] Beneficial effects of the present invention:

[0022] The present invention provides a battery cover plate. By providing an avoidance through groove on the first insulating member opposite to the welding area on the pole column bottom plate for welding with the pole ear, the first insulating member does not directly contact the welding area where the pole column bottom plate is welded to the pole ear, thereby reducing the thermal influence of the welding of the pole ear and the pole column bottom plate on the first insulating member, avoiding the melting deformation of the first insulating member due to excessive temperature, thus improving the insulation performance and assembly processability. At the same time, an insulating patch is provided in the area of the cover plate body opposite to the avoidance through groove, and the insulating patch is used to provide insulation protection for the area of the cover plate body exposed by the avoidance through groove to avoid short-circuit situations. Meanwhile, by defining the relationship between the projected area S1 of the welding area in the first direction on the pole column bottom plate and the projected area S2 of the avoidance through groove in the first direction on the pole column bottom plate, making the two satisfy 0.4 ≤ S1 / S2 ≤ 0.7, on the one hand, it avoids the area of the welding area being too small, resulting in poor connection strength after welding the pole ear and the pole column bottom plate, and there is a risk of disconnection between the pole ear and the pole column bottom plate; on the other hand, it avoids the area of the welding area being too large, resulting in too high a temperature of the pole column bottom plate, causing the part of the first insulating member in contact with the non-welding area of the pole column bottom plate to undergo melting deformation.

[0023] The present invention also provides a battery. By applying the above-mentioned battery cover plate, the probability of short circuit is not only reduced, thereby improving the product quality, 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is an exploded view of the structure of the battery cover plate provided by the present invention;

[0025] Figure 2 is a bottom plan view of the battery cover plate provided by the present invention;

[0026] Figure 3 is a schematic structural view of the conductive pole column in the battery cover plate provided by the present invention;

[0027] Figure 4 is a schematic structural view of the first insulating member in the battery cover plate provided by the present invention.

[0028] In the figure:

[0029] 1, conductive pole column; 11, pole column body; 12, pole column bottom plate; 121, first connecting plate; 122, second connecting plate; 123, fusing structure; 124, blocking through groove; 13, welding area; 14, insulating rubber sleeve;

[0030] 2, first insulating member; 21, insertion through hole; 22, avoidance through groove; 23, receiving groove; 24, limiting protrusion;

[0031] 3. Cover plate body

[0032] 4. Insulating patch

[0033] 5. Second insulating member

[0034] 6. Connecting block Detailed implementation manners

[0035] The present invention will be further described in detail below with reference to the 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 rather than all structures are shown in the drawings.

[0036] 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 can be the communication inside 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.

[0037] 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 between them. Moreover, the first feature being "above", "over", 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", "under", and "beneath" 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.

[0038] 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 element 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.

[0039] Since the plastic part is arranged between the terminal post and the light aluminum plate, when the tab is connected to the terminal post 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 because 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.

[0040] 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.

[0041] As Figures 1 to 4 shown, the battery cover plate includes a conductive terminal post 1, a first insulating part 2, a cover plate body 3 and an insulating patch 4. The conductive terminal post 1 includes a terminal post main body 11 and a terminal post bottom plate 12. The terminal post main body 11 is connected to the terminal post bottom plate 12. A welding area 13 for welding with the tab is provided on the side of the terminal post bottom plate 12 facing away from the terminal post main body 11. A plugging through hole 21 for plugging with the terminal post main body 11 and an avoidance through groove 22 opposite to the welding area 13 are provided on the first insulating part 2. The projection of the welding area 13 on the terminal post bottom plate 12 along the first direction is located within the projection of the avoidance through groove 22 on the terminal post bottom plate 12 along the first direction. The cover plate body 3 is arranged on the side of the first insulating part 2 facing away from the terminal post bottom plate 12. The insulating patch 4 is arranged on the side of the cover plate body 3 facing the first insulating part 2 and is arranged opposite to the avoidance through groove 22. The projection area of the welding area 13 on the terminal post bottom plate 12 along the first direction is S1, and the projection area of the avoidance through groove 22 on the terminal post bottom plate 12 along the first direction is S2, and 0.4 ≤ S1 / S2 ≤ 0.7 is satisfied.

[0042] The battery cover plate has an avoidance groove 22 on the first insulating member 2 which is opposite to the welding area 13 on the pole bottom plate 12 for welding with the pole ear, so that the first insulating member 2 will not directly contact the welding area 13 between the pole bottom plate 12 and the pole ear, thereby reducing the thermal influence of the pole ear and the pole bottom plate 12 on the first insulating member 2 during welding, avoiding the first insulating member 2 from being deformed by heat melting due to excessive temperature, thereby improving the insulation performance and assembly processability, and at the same time, an insulating patch 4 is arranged in the area opposite to the cover body 3 and the avoidance groove 22, and the insulating patch 4 is used to insulate and protect the area of the cover body 3 exposed by the avoidance groove 22 to avoid short circuit. At the same time, by limiting the relationship between the projection area S1 of the welding zone 13 on the pole bottom plate 12 along the first direction and the projection area S2 of the avoidance groove 22 on the pole bottom plate 12 along the first direction, the two satisfy 0.4≤S1 / S2≤0.7, thereby avoiding the area of the welding zone 13 being too small, resulting in poor connection strength between the pole ear and the pole bottom plate 12 after welding, resulting in the risk of disconnection between the pole ear and the pole bottom plate 12, and avoiding the area of the welding zone 13 being too large, resulting in excessive temperature of the pole bottom plate 12, so that the part of the first insulating member 2 that contacts the non-welding area of the pole bottom plate 12 undergoes thermal melt deformation.

[0043] In this embodiment, if Figure 1 As shown, the battery cover also includes a second insulating member 5 and a connecting block 6. A connecting through hole 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 to be connected to the connecting block 6. The second insulating member 5 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 6. 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.

[0044] The battery cover can be a welded cover or a riveted cover. When the battery cover is a welded cover, the connection block 6 is welded to the pole body 11. When the battery cover is a riveted cover, the connection block 6 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.

[0045] Optionally, the pole post 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 post body 11. The second connecting plate 122 is welded to the pole tab on the side facing away from the pole post body 11. The fusing structure 123 is disposed between the first connecting plate 121 and the second connecting plate 122.

[0046] The pole post 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, so that the pole post body 11 connected to the first connecting plate 121 is disconnected from the pole tab 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 post base plate 12 formed by an integral metal plate. Therefore, it is more necessary to provide an avoidance through groove 22 on the first insulating member 2 opposite to the welding area 13 on the pole post base plate 12 for welding with the pole tab, so that the first insulating member 2 does not directly contact the welding area 13 where the pole tab is welded to the pole post base plate 12, thereby reducing the heat influence of the pole tab and the pole post base plate 12 on the first insulating member 2 during welding, and avoiding the first insulating member 2 from melting and deforming due to excessive temperature, thereby improving the insulation performance and assembly processability.

[0047] In this embodiment, the conductive pole post 1 provided with the fusing structure 123 is generally the positive pole post, because the negative pole tab is generally made of copper material, so the negative pole post connected to the negative pole tab is generally also made of copper material. And the copper material has a higher thermal conductivity, so there is no need to provide a fusing structure 123 on the negative pole post to avoid wasting resources and reducing the manufacturing cost. In order to prevent the fusing structure 123 from melting when welding the pole tab and the pole post base plate 12, the melting point of the fusing structure 123 is greater than the temperature when welding the pole tab and the pole post base plate 12 and not greater than the temperature when a short circuit occurs.

[0048] Optionally, as Figure 2 、 Figure 3As shown, the projected area of the second connecting plate 122 on the cover plate body 3 in the first direction is S3, and 0.5 ≤ S2 / S3 ≤ 0.65 is satisfied. By limiting the projected area S3 of the second connecting plate 122 on the cover plate body 3 in the first direction to satisfy 0.5 ≤ S2 / S3 ≤ 0.65, on the one hand, it is avoided that the area for opening the avoidance through groove 22 is too large, resulting in a reduction in the contact area between the first insulating member 2 and the pole column bottom plate 12, thereby reducing the support strength of the first insulating member 2 for the pole column bottom plate 12, and causing the pole column bottom plate 12 to be damaged by the welding tooling during welding. On the other hand, it is avoided that the area for opening the avoidance through groove 22 is too small, resulting in the area where the first insulating member 2 contacts the pole column bottom plate 12 being too close to the welding area 13, thereby causing the part of the first insulating member 2 close to the welding area 13 to undergo hot melting deformation due to high temperature.

[0049] Among them, in order to verify the relationship between the projected area S1 of the welding area 13 on the pole column bottom plate 12 in the first direction and the projected area S2 of the avoidance through groove 22 on the pole column bottom plate 12 in the first direction, and the relationship between the area S3 of the surface where the second connecting plate 122 abuts against the first insulating member 2 and the projected area S2 of the avoidance through groove 22 on the pole column bottom plate 12 in the first direction on the thermal influence of the first insulating member 2 during the welding of the pole ear and the pole column bottom plate 12, as shown in Table 1, six sets of examples and six sets of comparative examples are provided for verification. Among them, the conducting pole column 1 is the positive pole column welded to the positive pole ear. A fusing structure 123 is provided on the pole column bottom plate 12 of the conducting pole column 1. The material of the first insulating member 2 abutting against the pole column bottom plate 12 is the industry - common material PP (melting point temperature 160°C - 170°C), and the welding power of the pole ear and the pole column bottom plate 12 is 1000W.

[0050] Table 1

[0051]

[0052] It can be seen from Examples 1 to 6 in Table 1 that when the ratio between the projected area S1 of the welding area 13 on the pole column bottom plate 12 in the first direction and the projected area S2 of the avoidance through groove 22 on the pole column bottom plate 12 in the first direction satisfies the range of 0.4 ≤ S1 / S2 ≤ 0.7, and the ratio between the area S3 of the surface where the second connecting plate 122 abuts against the first insulating member 2 and the projected area S2 of the avoidance through groove 22 on the pole column bottom plate 12 in the first direction satisfies 0.5 ≤ S2 / S3 ≤ 0.65, on the one hand, it can ensure that the area of the welding area 13 is large enough, so that the pole ear and the pole column bottom plate 12 have sufficient connection strength after welding, avoiding the risk of disconnection between the pole ear and the pole column bottom plate 12. On the other hand, it avoids the area of the welding area 13 being too large, resulting in too high a temperature of the pole column bottom plate 12, causing the part of the first insulating member 2 in contact with the non - welding area of the pole column bottom plate 12 to undergo hot melting deformation.

[0053] As can be seen from Comparative Example 1 and Comparative Example 2 in Table 1, when the ratio between the projected area S1 of the welding area 13 on the pole column base plate 12 in the first direction and the projected area S2 of the avoidance through groove 22 on the pole column base plate 12 in the first direction is less than the minimum value of 0.4 ≤ S1 / S2 ≤ 0.7, the area of the welding area 13 is too small at this time, resulting in insufficient connection strength after the tab is welded to the pole column base plate 12, and disconnection occurs after the tab is welded to the pole column base plate 12.

[0054] As can be seen from Comparative Example 3 in Table 1, when the ratio between the projected area S1 of the welding area 13 on the pole column base plate 12 in the first direction and the projected area S2 of the avoidance through groove 22 on the pole column base plate 12 in the first direction is greater than the maximum value of 0.4 ≤ S1 / S2 ≤ 0.7, the area of the welding area 13 is too large at this time, resulting in too high a temperature of the pole column base plate 12, and causing the part of the first insulating member 2 in contact with the non-welding area of the pole column base plate 12 to undergo thermal melting deformation.

[0055] As can be seen from Comparative Example 4 and Comparative Example 5 in Table 1, when the ratio between the area S3 of the surface where the second connecting plate 122 abuts against the first insulating member 2 and the projected area S2 of the avoidance through groove 22 on the pole column base plate 12 in the first direction is less than the minimum value of 0.5 ≤ S2 / S3 ≤ 0.65, the area of the avoidance through groove 22 opened is too small at this time, resulting in the area where the first insulating member 2 contacts the pole column base plate 12 being too close to the welding area 13, and causing the part of the first insulating member 2 close to the welding area 13 to undergo thermal melting deformation due to high temperature.

[0056] As can be seen from Comparative Example 6 in Table 1, when the ratio between the area S3 of the surface where the second connecting plate 122 abuts against the first insulating member 2 and the projected area S2 of the avoidance through groove 22 on the pole column base plate 12 in the first direction is greater than the maximum value of 0.5 ≤ S2 / S3 ≤ 0.65, the area of the avoidance through groove 22 opened is too large at this time, resulting in a reduction in the contact area between the first insulating member 2 and the pole column base plate 12, thereby reducing the support strength of the first insulating member 2 for the pole column base plate 12, and causing the pole column base plate 12 to be damaged by the welding tooling during welding.

[0057] Optionally, as Figure 3As shown, a blocking through slot 124 is provided on the fusing structure 123. By providing the blocking through slot 124 on the fusing structure 123, the cross-sectional area on the fusing structure 123 is reduced, so that in the event of a short circuit, due to the smaller cross-section, the heat generation is accelerated, thereby achieving early fusing, and its protection performance is better. However, since the cross-sectional area of the fusing structure 123 is smaller after the blocking through slot 124 is provided and its heat conduction ability is poorer, the temperature of the welding area 13 of the pole bottom plate 12 is higher. Therefore, it is more necessary to avoid the first insulating member 2 contacting the high-temperature welding area 13 of the pole bottom plate 12 by providing an avoidance through slot 22 in the first insulating member 2, so as to reduce the thermal influence of the high temperature on the first insulating member 2.

[0058] Optionally, as Figure 1 shown, the battery cover plate further includes an insulating rubber sleeve 14, and the insulating rubber sleeve 14 is provided outside the fusing structure 123. By providing the insulating rubber sleeve 14 outside the fusing structure 123, on the one hand, it provides insulation protection to avoid arcing due to the too small gap between the first connecting plate 121 and the second connecting plate 122. On the other hand, in the event of a short circuit, since the insulating rubber sleeve 14 is provided outside the fusing structure 123, the residue after the fusing structure 123 melts is prevented from falling into the battery interior, causing damage.

[0059] Optionally, as Figure 2 shown, the projection of the avoidance through slot 22 on the cover plate body 3 along the first direction is located within the area where the insulating patch 4 covers the cover plate body 3. By making the projection of the avoidance through slot 22 on the cover plate body 3 along the first direction located within the area where the insulating patch 4 covers the cover plate body 3, the area where the insulating patch 4 provides insulation protection to the cover plate body 3 is larger than the area where the cover plate body 3 is exposed by the avoidance through slot 22, thus ensuring the reliability of the insulation protection.

[0060] Furthermore, as Figure 2 shown, the distance dimension between the boundary of the projection of the avoidance through slot 22 on the cover plate body 3 along the first direction and the edge of the insulating patch 4 is L, and 1.5 mm ≤ L ≤ 4 mm is satisfied. By making the distance dimension L between the boundary of the projection of the avoidance through slot 22 on the cover plate body 3 along the first direction and the edge of the insulating patch 4 satisfy 1.5 mm ≤ L ≤ 4 mm, on the one hand, it avoids the situation where the area of the avoidance through slot 22 for heat dissipation is too small due to the too large distance dimension L, reducing the heat dissipation effect. On the other hand, it avoids the situation where it is too close to the edge of the insulating patch 4 due to the too small distance dimension L, resulting in an easy occurrence of a short circuit.

[0061] Optionally, as Figure 3 and Figure 4As shown, a receiving groove 23 is further formed in the first insulating member 2. The first connecting plate 121, the second connecting plate 122, and the fusing structure 123 are all received in the receiving groove 23. The receiving groove 23 includes a first wall surface opposite to the pole column bottom plate 12 in the first direction, and the avoiding through groove 22 is formed on the first wall surface. By forming the receiving groove 23 in the first insulating member 2, the pole column bottom plate 12 is received in the receiving groove 23, so that there is an overlapping part between the pole column bottom plate 12 and the first insulating member 2 in space, making the structure more compact, reducing the overall thickness dimension of the battery cover plate, reducing the occupied space, thereby increasing the volume of the electrode group and improving the power supply capacity.

[0062] Optionally, as Figure 3 and Figure 4 shown, the receiving groove 23 further includes a second wall surface opposite to the pole column bottom plate 12 in the second direction, and a limiting protrusion 24 abutting against the pole column bottom plate 12 is provided on the second wall surface. By providing the limiting protrusion 24 abutting against the pole column bottom plate 12 on the second wall surface, the position of the pole column bottom plate 12 is limited and fixed, avoiding the problem that the pole column bottom plate 12 moves out of place during the welding of the pole column bottom plate 12 and the pole ear, resulting in poor welding.

[0063] In this embodiment, since the pole column bottom plate 12 includes the first connecting plate 121 and the second connecting plate 122, it is necessary to provide the limiting protrusions 24 respectively abutting against the first connecting plate 121 and the second connecting plate 122 on the second wall surface to ensure the firmness of the fixation with the pole column bottom plate 12. The number of the limiting protrusions 24 provided on a single second wall surface can be freely selected according to requirements. For example, in this embodiment, three limiting protrusions 24 are provided on each second wall surface to abut against the first connecting plate 121, and one limiting protrusion 24 is provided to abut against the second connecting plate 122.

[0064] Optionally, the number of the limiting protrusions 24 abutting against the first connecting plate 121 on each second wall surface 223 is greater than the number of the limiting protrusions 24 abutting against the second connecting plate 122. The reason why the number of the limiting protrusions 24 abutting against the first connecting plate 121 is greater than the number of the limiting protrusions 24 abutting against the second connecting plate 122 is that the temperature of the first connecting plate 121 is lower than that of the second connecting plate 122. Therefore, it is avoided that the limiting protrusions 24 are melted by heat, resulting in ineffective fixation of the pole column bottom plate 12.

[0065] 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 opening, and the battery cover plate is arranged at the opening 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 increases the production capacity due to the improvement of the assembly processability.

[0066] Obviously, the above embodiments of the present invention are merely examples for clearly explaining the present invention, rather than limiting 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 plate includes: A conductive electrode post, which includes a post body and a post bottom plate. The post body is connected to the post bottom plate, and a welding area for welding with a tab is provided on a side of the post bottom plate facing away from the post body. A first insulating member, on which an insertion through-hole for inserting the post body and an avoidance through-slot opposite to the welding area are provided. The projection of the welding area on the post bottom plate along a first direction is located within the projection of the avoidance through-slot on the post bottom plate along the first direction. A cover plate body, which is provided on a side of the first insulating member facing away from the post bottom plate. An insulating patch, which is provided on a side of the cover plate body facing the first insulating member and is arranged opposite to the avoidance through-slot. The projection area of the welding area on the post bottom plate along the first direction is S1, and the projection area of the avoidance through-slot on the post bottom plate along the first direction is S2, and 0.4 ≤ S1 / S2 ≤ 0.7 is satisfied.

2. The battery cover plate according to claim 1, characterized in that, The post bottom plate includes a first connecting plate, a second connecting plate, and a fusing structure. The first connecting plate is connected to the post body, the second connecting plate is welded to the tab on a side facing away from the post body, and the fusing structure is arranged between the first connecting plate and the second connecting plate.

3. The battery cover plate according to claim 2, characterized in that, The projection area of the second connecting plate on the cover plate body along the first direction is S3, and 0.5 ≤ S2 / S3 ≤ 0.65 is satisfied.

4. The battery cover plate according to claim 2, characterized in that, A blocking through-slot is provided on the fusing structure.

5. The battery cover plate according to claim 2, characterized in that The conductive electrode post further includes an insulating rubber sleeve, which is arranged outside the fusing structure.

6. The battery cover plate according to claim 1, wherein, The projection of the avoidance through-slot on the cover plate body along the first direction is located within the area where the insulating patch covers the cover plate body.

7. The battery cover plate according to claim 6, characterized in that The distance dimension between the boundary of the projection formed by the avoidance through-slot on the cover plate body along the first direction and the edge of the insulating patch is L, and 1.5 mm ≤ L ≤ 4 mm is satisfied.

8. The battery cover plate according to claim 2, wherein, The first insulating member is further provided with a receiving groove, and the first connecting plate, the second connecting plate, and the fusing structure are all received in the receiving groove. The receiving groove includes a first wall surface opposite to the post bottom plate along the first direction, and the avoidance through-slot is provided on the first wall surface.

9. The battery cover plate according to claim 8, characterized in that The receiving groove further includes two second wall surfaces opposite to the post bottom plate along a second direction, and limiting protrusions for abutting against the post bottom plate are symmetrically distributed on the two second wall surfaces. 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.

10. A battery, characterized in that, The battery includes a battery stack, a battery housing, and the battery cover plate according to any one of claims 1-9. 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 seal the battery housing and form a receiving cavity for receiving the battery stack.

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