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 a plurality of high temperature resistant insulating parts, the conductive pole comprises a pole main body and a pole bottom plate, the pole main body is connected to the pole bottom plate, the pole bottom plate is welded with a tab, and the first insulating part is connected with the cover plate body. A plugging through hole and an avoiding through hole are formed in the first insulating part, a plugging blind hole is formed in the cover plate body, one end of the high-temperature-resistant insulating part is embedded in the plugging blind hole, and the other end of the high-temperature-resistant insulating part penetrates through the avoiding through hole to abut against the pole bottom plate, so that a heat insulation gap is formed between the first insulating part and the pole bottom plate. By forming the heat insulation gap, on one hand, the first insulating part is prevented from being in direct contact with the pole bottom plate, and on the other hand, an air interlayer is formed between the first insulating part and the pole bottom plate, so that the heat influence on the first insulating part during welding of the tab and the pole bottom plate is reduced, and the first insulating part is prevented from being deformed due to high temperature; and the insulation performance and the assembly manufacturability are improved.

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, the first insulating member is provided with a plug-in through hole for the pole body to pass through and at least four avoidance through holes symmetrically distributed on the first insulating member;

[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, and a side of the cover plate body facing the first insulating member being provided with plug-in blind holes corresponding one to one with the avoidance through holes;

[0010] A plurality of high temperature resistant insulating parts, wherein the plurality of high temperature resistant insulating parts correspond to the plug-in blind holes one by one, one end of the high temperature resistant insulating part is embedded in the plug-in blind hole, and the other end passes through the avoidance through hole and abuts against the pole bottom plate, so as to form a heat insulation gap between the first insulating part and the pole bottom plate;

[0011] A contact area for abutting against the high temperature resistant insulating part is provided on the surface of the pole bottom plate facing the high temperature resistant insulating part, the area of the contact area is S, the total area of the projections of the plurality of high temperature resistant insulating parts on the pole bottom plate along the first direction is S1, and 0.12≤S1 / S≤0.25 is satisfied.

[0012] Optionally, a dimension of the thermal insulation gap along the first direction is T, and satisfies 0.12 mm ≤ T ≤ 0.35 mm.

[0013] Optionally, the plug-in blind hole is a conical hole whose aperture gradually decreases in the direction approaching the first insulating member, and the high temperature resistant insulating member includes an abutting portion abutting against the pole bottom plate and a connecting portion with an isosceles trapezoidal cross-section, and the connecting portion is embedded in the plug-in blind hole.

[0014] Optionally, the tapered plug-in blind hole has a side hole wall arranged at an angle with the first direction, and the angle between the side hole wall and the first direction is F, and F≥10°.

[0015] 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 the side facing away from the first insulating member, the fuse structure is arranged between the first connecting plate and the second connecting plate, and the contact area is provided on the surface of the second connecting plate facing the high temperature resistant insulating member.

[0016] Optionally, a blocking groove is provided on the fuse structure.

[0017] Optionally, the conductive electrode column further includes an insulating rubber sleeve, and the insulating rubber sleeve is arranged outside the fuse structure.

[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 abutting against the pole bottom plate along the first direction, and the avoidance through hole is provided on the first wall surface.

[0019] Optionally, the accommodating groove further includes two second wall surfaces opposite to the pole post bottom plate in the second direction. A plurality of limiting protrusions abutting against the pole 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.

[0020] On the other hand, a battery is provided. The battery includes a pole group, a battery housing, and the battery cover plate according to any one of the above. The battery housing is a cavity structure with an opening. The battery cover plate is arranged at the opening of the battery housing to seal the battery housing and form an accommodating cavity for accommodating the pole group.

[0021] Advantages of the present invention:

[0022] The present invention provides a battery cover plate. By providing an avoidance through hole in the first insulating member and embedding a high-temperature resistant insulating member corresponding to the avoidance through hole in the cover plate body, the high-temperature resistant insulating member passes through the avoidance through hole and abuts against the pole post bottom plate, so as to form a heat insulation gap between the first insulating member and the pole post bottom plate. On the one hand, it avoids the direct contact between the first insulating member and the pole post bottom plate welded to the pole ear. On the other hand, an air isolation layer is formed between the first insulating member and the pole post bottom plate by using the heat insulation gap, thereby reducing the thermal influence of the welding between the pole ear and the pole post bottom plate on the first insulating member, avoiding the deformation of the first insulating member due to high temperature, improving the insulation performance and assembly processability, and defining the relationship between the total area S1 of the projections of a plurality of high-temperature resistant insulating members on the second connecting plate in the first direction and the area S of the contact region on the pole post bottom plate that abuts against the high-temperature resistant insulating members, so that the two satisfy 0.12 ≤ S1 / S ≤ 0.25. Thus, on the one hand, it avoids the area of the high-temperature resistant insulating member used for supporting the pole post bottom plate being too small, resulting in the problem of poor welding caused by the shaking of the pole post bottom plate during welding. On the other hand, it avoids the area of the high-temperature resistant insulating member used for supporting the pole post bottom plate being too large, resulting in the high-temperature resistant insulating member occupying more space, reducing the air isolation layer and lowering the heat insulation effect.

[0023] 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

[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 plan view of the bottom of the battery cover plate provided by the present invention;

[0026] Figure 3 is a cross-sectional view of the battery cover plate provided by the present invention;

[0027] Figure 4 is a schematic structural diagram of the cover plate body of the battery cover plate provided by the present invention, which is assembled with a high-temperature resistant insulating member;

[0028] Figure 5 is a schematic structural diagram of the conductive electrode post in the battery cover plate provided by the present invention;

[0029] Figure 6 is a partial schematic structural diagram of the first insulating member in the battery cover plate provided by the present invention;

[0030] Figure 7 is a schematic structural diagram of the high-temperature resistant insulating member in the battery cover plate provided by the present invention;

[0031] Figure 8 is a structural sectional view of the cover plate body in the battery cover plate provided by the present invention;

[0032] Figure 9 is Figure 8 an enlarged structural view of part H in

[0033] In the figure:

[0034] 1. Conductive electrode post; 11. Post main body; 12. Post bottom plate; 121. First connecting plate; 122. Second connecting plate; 123. Fusing structure; 124. Blocking through groove; 13. Insulating rubber sleeve;

[0035] 2. First insulating member; 21. Insertion through hole; 22. Avoidance through hole; 23. Accommodating groove; 24. Limiting protrusion;

[0036] 3. Cover plate body; 31. Insertion blind hole; 32. Side hole wall;

[0037] 4. High-temperature resistant insulating member; 41. Connecting part; 42. Abutting part;

[0038] 5. Second insulating member;

[0039] 6. Connecting block. Detailed implementation manners

[0040] 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 sake of description, only parts related to the present invention are shown in the drawings, rather than all the structures.

[0041] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", 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 communication inside 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 situations.

[0042] 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", "over", and "on top of" 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.

[0043] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationship 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 should not be construed 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 meaning.

[0044] Since the plastic part is arranged between the pole column and the light aluminum plate, when the pole ear and the pole column are connected by welding, the high temperature generated causes the plastic part to be heated and deformed, and extend horizontally. This not only leads to a reduction in 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 after the plastic part extends horizontally due to heat, it will cause the outer dimension of the battery cover plate to increase, resulting in difficulty in shelling and poor assembly processability.

[0045] 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.

[0046] Such as Figures 1 to 9As shown, the battery cover comprises a conductive electrode 1, a first insulating member 2, a cover body 3 and a plurality of high temperature resistant insulating members 4, the conductive electrode 1 comprises 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 for the pole body 11 to pass through and at least four avoidance through holes 22 symmetrically distributed on the first insulating member 2, 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 through hole 22 one by one with the avoidance through hole 22 Corresponding to the plug-in blind hole 31, multiple high-temperature resistant insulation corresponds to the plug-in blind hole 31 one by one, one end of the high-temperature resistant insulation is embedded in the plug-in blind hole 31, and the other end passes through the avoidance through hole 22 to abut on the pole bottom plate 12, so as to form an insulation gap between the first insulating member 2 and the pole bottom plate 12, and a contact area for abutting against the high-temperature resistant insulating member 4 is provided on the surface of the pole bottom plate 12 facing the high-temperature resistant insulating member 4, and the area of the contact area is S, and the total area of the projection of multiple high-temperature resistant insulating members 4 on the pole bottom plate 12 along the first direction is S1, and 0.12≤S1 / S≤0.25 is satisfied.

[0047] The battery cover plate is provided with an avoidance through hole 22 on the first insulating member 2, and a high temperature resistant insulating member 4 corresponding to the avoidance through hole 22 is embedded in the cover plate body 3, so that the high temperature resistant insulating member 4 passes through the avoidance through hole 22 and abuts against the pole bottom plate 12, thereby forming a heat insulation gap between the first insulating member 2 and the pole bottom plate 12, on the one hand, avoiding the first insulating member 2 from directly contacting the pole bottom plate 12 welded to the pole ear, and on the other hand, utilizing the heat insulation 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 the first insulating member 2 from being deformed due to high temperature, and improving the insulation performance. and assembly processability, and the relationship between the total area S1 of the projections of the plurality of high-temperature resistant insulating parts 4 on the pole bottom plate 12 along the first direction and the area S of the contact area on the pole bottom plate 12 that abuts against the high-temperature resistant insulating parts 4 is limited, so that the two satisfy 0.12≤S1 / S≤0.25, thereby avoiding on the one hand the area of the high-temperature resistant insulating parts 4 used to support the pole bottom plate 12 being too small, causing the pole bottom plate 12 to shake during welding and resulting in poor welding problems, and on the other hand avoiding on the area of the high-temperature resistant insulating parts 4 used to support the pole bottom plate 12 being too large, causing the high-temperature resistant insulating parts 4 to occupy more space, resulting in a reduction in the air barrier and a reduction in the thermal insulation effect.

[0048] In this embodiment, the number of high temperature resistant insulating parts 4 is N, and the contact area between each high temperature resistant insulating part 4 and the second connecting plate 122 is P, so S1=N×P, the width dimension of the contact area along the second direction is W, and the length dimension along the third direction is L, so S=W×L.

[0049] 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.

[0050] 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.

[0051] Optionally, the dimension of the thermal insulation gap along the first direction is T, and satisfies 0.12mm≤T≤0.35mm. By limiting the dimension T of the thermal insulation gap along the first direction to satisfy 0.12mm≤T≤0.35mm, on the one hand, it is avoided that the thermal insulation gap is too small and the thermal insulation effect is poor, and on the other hand, it is avoided that the thermal insulation gap is too large, which increases the overall size of the battery cover, has size redundancy, wastes materials, and the suspended area of the second connecting plate 122 is too large, and the stability during welding is poor.

[0052] The dimension T of the thermal insulation gap along the first direction may be any value between 0.12 mm and 0.35 mm or a range between any two values, such as 0.12 mm, 0.24 mm, 0.3 mm, 0.32 mm, 0.35 mm, etc.

[0053] Optionally, the plug-in blind hole 31 is a tapered hole whose aperture gradually decreases in the direction approaching the first insulating member 2, and the high temperature resistant insulating member 4 includes an abutting portion 42 abutting against the pole bottom plate 12 and a connecting portion 41 with an isosceles trapezoidal cross section, and the connecting portion 41 is embedded in the plug-in blind hole 31. By designing the plug-in blind hole 31 as a tapered hole whose aperture gradually decreases in the direction approaching the first insulating member 2, and providing the connecting portion 41 with an isosceles trapezoidal cross section on the high temperature resistant insulating member 4, after the two are connected, the connection is more stable, and the high temperature resistant insulating member 4 is prevented from falling off from the plug-in blind hole 31.

[0054] Furthermore, the conical insertion blind hole 31 has a side hole wall 32 disposed at an angle to the first direction. The angle between the side hole wall 32 and the first direction is F, and F≥10°. By defining the angle F between the side hole wall 32 and the first direction to satisfy F≥10°, the situation where the inclination angle is too small is avoided, which may otherwise result in an excessively small area where the insertion blind hole 31 is clamped to the high-temperature resistant insulating member 4 in the horizontal direction, thereby reducing the clamping strength between the two.

[0055] Optionally, the pole bottom 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. 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 disposed between the first connecting plate 121 and the second connecting plate 122. A contact area is provided on the surface of the second connecting plate 122 facing the high-temperature resistant insulating member 4.

[0056] The pole bottom plate 12 is formed by the first connecting plate 121, the second connecting plate 122, and the fusing structure 123. In the event of a short circuit, the high temperature generated causes the fusing structure 123 to fuse, disconnecting the conductive pole 1 connected to the first connecting plate 121 from the pole ear connected to the second connecting plate 122, thereby improving the safety protection performance. Moreover, since the first connecting plate 121 and the second connecting plate 122 are connected by the fusing structure 123, the heat dissipation area is smaller and the heat conduction ability is poorer compared to the pole bottom plate 12 formed by an integral metal plate. Therefore, by abutting a plurality of high-temperature resistant insulating members 4 against the second connecting plate 122, on the one hand, it is possible to prevent the first insulating member 2 from directly contacting the pole bottom plate 12 welded to the pole ear, and on the other hand, an air isolation layer is formed between the first insulating member 2 and the pole bottom plate 12 by means of the heat insulation gap, thereby reducing the thermal influence of the pole ear and the pole bottom plate 12 during welding on the first insulating member 2, preventing the first insulating member 2 from deforming due to high temperature, and improving the insulation performance and assembly processability.

[0057] In this embodiment, the conductive pole 1 provided with the fusing structure 123 is generally the positive pole. Since the negative pole ear is generally made of copper, the negative pole connected to the negative pole ear is also generally made of copper. The thermal conductivity of copper is higher, so there is no need to provide a fusing structure 123 on the negative pole to avoid wasting resources and reducing the manufacturing cost. In order to prevent the fusing structure 123 from melting during the welding of the pole ear and the pole bottom plate 12, the melting point of the fusing structure 123 is greater than the temperature during the welding of the pole ear and the pole bottom plate 12 and not greater than the temperature during a short circuit.

[0058] Optionally, 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 when a short circuit occurs, the fusing structure 123 can be quickly fused, 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 a plurality of high-temperature resistant insulating members 4 to form an air isolation layer between the first insulating member 2 and the second connecting plate 122, so as to reduce the thermal influence of the high temperature generated when the second connecting plate 122 is welded to the tab on the first insulating member 2.

[0059] Optionally, 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 provides insulation protection to prevent arcing 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 arranged outside the fusing structure 123, it can prevent the residue after the fusing structure 123 melts from falling into the battery and causing damage.

[0060] In order to verify the influence of the total projected area S1 of the plurality of high-temperature resistant insulating members 4 on the second connecting plate 122 in the first direction, the area S of the surface of the second connecting plate 122 in contact with the high-temperature resistant insulating members 4, and the dimension T of the heat insulation gap in the first direction on the support stability and the heat insulation effect, as shown in Table 1, six sets of embodiments and four sets of comparative examples are provided for verification. The conductive electrode post 1 is a positive electrode post welded to the positive tab. A fusing structure 123 is arranged on the electrode post bottom plate 12 of the conductive electrode post 1. The material of the first insulating member 2 in contact with the electrode post bottom plate 12 is the industry general material PP (melting point temperature 160°C - 170°C), and the welding power of the tab to the electrode post bottom plate 12 is 1000W.

[0061] Table 1

[0062]

[0063] As can be seen from Examples 1 to 6 in Table 1, when the total projected area S1 of multiple high-temperature resistant insulating parts 4 along the first direction on the second connecting plate 122 and the area S of the surface of the second connecting plate 122 in contact with the high-temperature resistant insulating parts 4 satisfy the range of 0.12 ≤ S1 / S ≤ 0.25, it ensures that the multiple high-temperature resistant insulating parts 4 have sufficient support area and at the same time avoids the excessive space occupied by the multiple high-temperature resistant insulating parts 4, reducing the heat insulation effect of the air layer. After welding, there are no hot melting marks on the first insulating part 2, and the welding between the tab and the second connecting plate 122 is also free of welding defects. And when the dimension T of the heat insulation gap along the first direction satisfies the range of 0.12 mm ≤ T ≤ 0.35 mm, the heat insulation gap has a good heat insulation effect and avoids an overly large suspended area of the second connecting plate 122.

[0064] As can be seen from Comparative Example 1 in Table 1, when the dimension T of the heat insulation gap along the first direction is less than the minimum value of 0.12 mm ≤ T ≤ 0.35 mm, the heat insulation gap is too small, resulting in poor heat insulation effect, and there is still a large amount of heat transferred to the first insulating part 2, causing the first insulating part 2 to melt.

[0065] As can be seen from Comparative Example 2 in Table 1, when the relationship value between the total projected area S1 of multiple high-temperature resistant insulating parts 4 along the first direction on the second connecting plate 122 and the area S of the surface of the second connecting plate 122 in contact with the high-temperature resistant insulating parts 4 is less than the minimum value of 0.12 ≤ S1 / S ≤ 0.25, the area of the high-temperature resistant insulating parts 4 used to support the second connecting plate 122 is too small, causing the second connecting plate 122 to shake during welding, resulting in welding defects.

[0066] As can be seen from Comparative Example 3 in Table 1, when the relationship value between the total projected area S1 of multiple high-temperature resistant insulating parts 4 along the first direction on the second connecting plate 122 and the area S of the surface of the second connecting plate 122 in contact with the high-temperature resistant insulating parts 4 is greater than the maximum value of 0.12 ≤ S1 / S ≤ 0.25, the area of the high-temperature resistant insulating parts 4 used to support the second connecting plate 122 is too large, causing the high-temperature resistant insulating parts 4 to occupy more space, resulting in the reduction of the air layer and poor heat insulation effect. There is still a large amount of heat transferred to the first insulating part 2, causing the first insulating part 2 to melt.

[0067] As can be seen from Comparative Example 4 in Table 1, when the dimension T of the heat insulation gap along the first direction is greater than the maximum value of 0.12 mm ≤ T ≤ 0.35 mm, the heat insulation gap is too large, resulting in an increase in the overall external dimension of the battery cover, there is dimensional redundancy, wasting materials, and the suspended area of the second connecting plate 122 is too large, with poor stability during welding, resulting in poor welding quality.

[0068] Optionally, 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 that abuts against the pole bottom plate 12 in the first direction, and the avoiding through hole 22 is formed in the first wall surface. By forming the receiving groove 23 in the first insulating member 2, the pole bottom plate 12 is received in the receiving groove 23, so that there is an overlapping part between the pole 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.

[0069] Optionally, the receiving groove 23 further includes two second wall surfaces opposite to the pole bottom plate 12 in the second direction, and a plurality of limiting protrusions 24 abutting against the pole bottom plate 12 are symmetrically distributed on the two second wall surfaces. By providing the limiting protrusions 24 abutting against the pole bottom plate 12 on the second wall surface, the position of the pole bottom plate 12 is limited and fixed, avoiding the problem of poor welding caused by the displacement of the pole bottom plate 12 during the welding of the pole bottom plate 12 and the pole ear.

[0070] In this embodiment, since the pole bottom plate 12 includes the first connecting plate 121 and the second connecting plate 122, it is necessary to provide the limiting protrusions 24 abutting against the first connecting plate 121 and the second connecting plate 122 respectively on the second wall surface to ensure the firmness of the fixation with the pole 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.

[0071] Optionally, the number of the limiting protrusions 24 abutting against the first connecting plate 121 on each second wall surface 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 bottom plate 12.

[0072] In this embodiment, a battery is further provided. The battery includes an electrode 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 arranged at the open mouth of the battery housing to close the battery housing and form a receiving cavity for receiving the electrode 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.

[0073] Obviously, the above 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 implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included within 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, the first insulating member is provided with a plug-in through hole for the pole body to pass through and at least four avoidance through holes symmetrically distributed on the first insulating member; A cover plate body, the cover plate body being arranged on a side of the first insulating member away from the pole bottom plate, and a side of the cover plate body facing the first insulating member being provided with plug-in blind holes corresponding one to one with the avoidance through holes; A plurality of high temperature resistant insulating parts, wherein the plurality of high temperature resistant insulating parts correspond to the plug-in blind holes one by one, one end of the high temperature resistant insulating part is embedded in the plug-in blind hole, and the other end passes through the avoidance through hole and abuts against the pole bottom plate, so as to form a heat insulation gap between the first insulating part and the pole bottom plate; A contact area for abutting against the high temperature resistant insulating part is provided on the surface of the pole bottom plate facing the high temperature resistant insulating part, the area of the contact area is S, the total area of the projections of the plurality of high temperature resistant insulating parts on the pole bottom plate along the first direction is S1, and 0.12≤S1 / S≤0.25 is satisfied.

2. The battery cover plate according to claim 1, characterized in that, The dimension of the thermal insulation gap along the first direction is T, and satisfies 0.12 mm≤T≤0.35 mm.

3. The battery cover plate according to claim 1, characterized in that, The plug-in blind hole is a tapered hole whose aperture gradually decreases in the direction approaching the first insulating member. The high temperature resistant insulating member includes an abutting portion abutting against the pole bottom plate and a connecting portion with an isosceles trapezoidal cross section. The connecting portion is embedded in the plug-in blind hole.

4. The battery cover plate according to claim 3, characterized in that The tapered plug-in blind hole has a side hole wall arranged at an angle with the first direction, and the angle between the side hole wall and the first direction is F, and F≥10°.

5. The battery cover plate according to claim 1, characterized in that, 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 the side facing away from the first insulating member, the fuse structure is arranged between the first connecting plate and the second connecting plate, and the contact area is provided on the surface of the second connecting plate facing the high temperature resistant insulating member.

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

7. The battery cover plate according to claim 5, characterized in that, The conductive electrode column also includes an insulating rubber sleeve, and the insulating rubber sleeve is arranged outside the fuse structure.

8. The battery cover plate according to claim 5, characterized in that, The first insulating member is also provided with a receiving groove, in which the first connecting plate, the second connecting plate and the fuse structure are all accommodated. The receiving groove includes a first wall surface abutting against the pole bottom plate along the first direction, and the avoidance through hole is provided on the first wall surface.

9. The battery cover plate according to claim 8, characterized in that, The accommodating groove also includes two second wall surfaces opposite to the pole bottom plate along the second direction, and a plurality of limiting protrusions abutting against the pole bottom plate are symmetrically distributed on the two second wall surfaces, 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.

10. A battery, characterized in that, The battery includes a pole group, a battery housing, and a battery cover plate as described in any one of claims 1-9. The battery housing is a cavity structure provided with an opening, and the battery cover plate is disposed at the opening of the battery housing to close the battery housing and form a receiving cavity for receiving the pole group.

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