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 first insulating part, a conductive pole and an isolation rubber sleeve, 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 forms a welding mark, and the isolation rubber sleeve is connected with the first insulating part. The isolation rubber sleeve comprises a connecting part and a first isolation part, a connecting through hole is formed in the connecting part, the pole bottom plate is inserted into the connecting through hole, and the first isolation part is arranged between the pole bottom plate and the first insulating part and is provided with an avoiding through hole. Therefore, the heat insulation cavity is formed between the pole bottom plate and the first insulating part and in the area corresponding to the welding mark, direct contact of the pole bottom plate and the first insulating part in the area corresponding to the welding mark is avoided, heat transferred to the first insulating part in the welding process is reduced, deformation of the first insulating part due to high temperature is avoided, and the service life of the first insulating part is prolonged. 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, which have small thermal influence, high insulation capacity 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 being connected to the pole bottom plate, and a welding mark for welding with a pole ear being provided on a side of the pole bottom plate away from the pole body;

[0008] A first insulating member, wherein the first insulating member is provided with an inserting through hole, and the inserting through hole is inserted into the pole body;

[0009] An isolation rubber sleeve, the isolation rubber sleeve comprising a connecting portion and a first isolation portion, the connecting portion is provided with a connecting through hole, the pole bottom plate is inserted into the connecting through hole, the first isolation portion is provided between the pole bottom plate and the first insulating member, and is provided with an avoidance through hole, the projection of the weld mark on the pole bottom plate along the first direction is located within the projection of the avoidance through hole on the pole bottom plate along the first direction;

[0010] The projected area of the welding mark on the pole post bottom plate along the first direction is S1, and the projected area of the first isolation part on the pole post bottom plate along the first direction is S2, and 0.4 ≤ S2 / (S1 + S2) ≤ 0.6 is satisfied.

[0011] Optionally, the thickness dimension of the first isolation part along the first direction is T, and 0.35 mm ≤ T ≤ 0.6 mm is satisfied.

[0012] Optionally, the width dimension of the projection of the first isolation part on the pole post bottom plate along the first direction is W, and 3 mm ≤ W ≤ 6 mm is satisfied.

[0013] Optionally, the first isolation part extends along the first direction in the direction close to the pole ear to form a second isolation part covering the outer side wall of the pole post bottom plate. The length dimension of the second isolation part extending along the first direction is H1, and the thickness dimension of the pole post bottom plate along the first direction is H2, and 0.2 mm ≤ H2 - H1 ≤ 0.4 mm is satisfied.

[0014] Optionally, the length dimension H1 of the second isolation part extending along the first direction satisfies 1 mm ≤ H1 ≤ 2.5 mm.

[0015] Optionally, the thickness dimension H2 of the pole post bottom plate along the first direction satisfies 1.5 mm ≤ H2 ≤ 3 mm.

[0016] Optionally, the pole post bottom plate includes a first connecting plate, a second connecting plate and a fuse plate. The fuse plate is connected between the first connecting plate and the second connecting plate. The pole post body is connected to the first connecting plate. The side of the second connecting plate facing away from the pole post body is connected to the pole ear. The connecting part is sleeved outside the fuse plate, and the first isolation part is clamped between the second connecting plate and the first insulating part.

[0017] Optionally, a blocking through groove is formed on the fuse plate.

[0018] Optionally, the isolation rubber sleeve is injection molded on the pole post bottom plate.

[0019] On the other hand, a battery is provided. The battery includes a pole group, a battery housing and the battery cover plate as described in 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 close the battery housing and form an accommodation cavity for accommodating the pole group.

[0020] Advantages of the present invention:

[0021] The present invention provides a battery cover plate. By providing an isolation rubber sleeve composed of a connecting portion and a first isolation portion on the pole column bottom plate, and opening an avoidance through-hole on the first isolation portion, the projection of which on the pole column bottom plate along the first direction includes the projection of the welding mark on the pole column bottom plate along the first direction, a heat insulation cavity is formed between the pole column bottom plate and the first insulating member in the area corresponding to the welding mark, avoiding direct contact between the pole column bottom plate and the first insulating member in the area corresponding to the welding mark, reducing the heat transferred to the first insulating member during the welding process, avoiding deformation of the first insulating member due to high temperature, improving the insulation performance and the assembly processability. And by defining the relationship between the projection area S1 of the welding mark on the pole column bottom plate along the first direction and the projection area S2 of the first isolation portion on the pole column bottom plate along the first direction, making the two satisfy 0.4 ≤ S2 / (S1 + S2) ≤ 0.6, on the one hand, avoiding that the projection area of the first isolation portion along the first direction is too small, resulting in insufficient area for contacting the pole column bottom plate and being unable to provide effective support for the pole column bottom plate, so that during welding, due to the excessive suspended area of the pole column bottom plate, it is deformed by force, and on the other hand, avoiding that the projection area of the first isolation portion along the first direction is too large, resulting in too small a space for the heat insulation cavity formed between the pole column bottom plate and the first insulating member in the area corresponding to the welding mark, thereby reducing the heat insulation effect.

[0022] The present invention also provides a battery. By applying the above battery cover plate, not only the probability of short circuit is reduced and the product quality is improved, but also due to the improvement of the assembly processability, the assembly speed is greatly increased, the assembly cycle is shortened, and the production capacity is improved. BRIEF 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 top view of the assembled guide electrode column and the isolation colloid in the battery cover plate provided by the present invention;

[0025] Figure 3 is Figure 2 a cross-sectional view of the structure along the A-A direction in

[0026] Figure 4 is Figure 3 a magnified view of the structure of part B in

[0027] Figure 5 is a schematic structural view of the guide electrode column in the battery cover plate provided by the present invention;

[0028] Figure 6 is a schematic structural view of the isolation rubber sleeve in the battery cover plate provided by the present invention.

[0029] In the figure:

[0030] 100. Welding mark;

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

[0032] 2. First insulating part; 21. Insertion through hole;

[0033] 3. Isolation rubber sleeve; 31. Connection part; 32. First isolation part; 33. Avoidance through hole; 34. Second isolation part;

[0034] 4. Cover plate body;

[0035] 5. Second insulating part;

[0036] 6. Connection block. Detailed implementation manner

[0037] 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 the parts related to the present invention are shown in the drawings, rather than all the structures.

[0038] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] 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 of 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 over", and "on the top of" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher horizontal height than the second feature. The first feature being "below", "below and under", and "under the bottom of" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicating that the first feature is at a lower horizontal height than the second feature.

[0040] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "right", etc. are based on the orientation or positional relationships shown in the drawings. They are only for convenience of description and simplifying the operations, 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. Therefore, it 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.

[0041] Since the plastic part is arranged between the pole post and the light aluminum plate, when the pole ear and the pole post are connected by welding, the high temperature generated causes the plastic part to be deformed by heat and extend horizontally. This not only reduces the thickness of the plastic part, increases the probability of the plastic part being punctured and causing a short circuit, has a relatively high risk, and has poor insulation protection, but also because the plastic part extends horizontally after being heated, it will increase the external dimension of the battery cover plate, resulting in difficulty in shelling and poor assembly processability.

[0042] 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.

[0043] As Figures 1 to 6 shown, the battery cover plate includes a first insulating part 2, a conductive pole post 1 and an isolation rubber sleeve 3. The conductive pole post 1 includes a pole post main body 11 and a pole post bottom plate 12. The pole post main body 11 is connected to the pole post bottom plate 12. A welding mark 100 for welding with the pole ear is provided on the side of the pole post bottom plate 12 facing away from the pole post main body 11. A plugging through hole 21 is formed on the first insulating part 2, and the plugging through hole 21 is plugged with the pole post main body 11. The isolation rubber sleeve 3 includes a connecting part 31 and a first isolation part 32. A connecting through hole is formed on the connecting part 31, and the pole post bottom plate 12 is inserted into the connecting through hole. The first isolation part 32 is arranged between the pole post bottom plate 12 and the first insulating part 2 and is provided with an avoidance through hole 33. The projection of the welding mark 100 on the pole post bottom plate 12 along the first direction is located within the projection of the avoidance through hole 33 on the pole post bottom plate 12 along the first direction. The projection area of the welding mark 100 on the pole post bottom plate 12 along the first direction is S1, and the projection area of the first isolation part 32 on the pole post bottom plate 12 along the first direction is S2, and 0.4≤S2 / (S1 + S2)≤0.6 is satisfied.

[0044] The battery cover plate is provided with an isolation rubber sleeve 3 consisting of a connecting portion 31 and a first isolation portion 32 on the pole bottom plate 12, and an avoidance through hole 33 is opened on the first isolation portion 32, the projection of which on the pole bottom plate 12 along the first direction includes the projection of the weld mark 100 on the pole bottom plate 12 along the first direction, so that a heat-insulating cavity is formed between the pole bottom plate 12 and the first insulating member 2 in the area corresponding to the weld mark 100, thereby avoiding direct contact between the pole bottom plate 12 and the first insulating member 2 in the area corresponding to the weld mark 100, reducing the heat transferred to 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 by the weld mark 100 along the first direction on the pole The relationship between the projected area S1 on the bottom plate 12 and the projected area S2 of the first isolating portion 32 on the pole bottom plate 12 along the first direction is limited so that the two satisfy 0.4≤S2 / (S1+S2)≤0.6, thereby, on the one hand, avoiding the projected area of the first isolating portion 32 along the first direction being too small, resulting in insufficient area for contact with the pole bottom plate 12, and failing to provide effective support for the pole bottom plate 12, resulting in deformation due to excessive suspension area of the pole bottom plate 12 during welding; on the other hand, avoiding the projected area of the first isolating portion 32 along the first direction being too large, resulting in too small a space for forming a heat-insulating cavity between the pole bottom plate 12 and the first insulating member 2 in the area corresponding to the weld mark 100, thereby reducing the heat-insulating effect.

[0045] In this embodiment, the battery cover also includes a cover body 4, 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 4. 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 4 away from the first insulating member 2, and is used to achieve insulation protection between the cover body 4, 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 4, the first insulating member 2 is provided with a limiting 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 4, and the positioning protrusion is inserted in the positioning through hole.

[0046] The battery cover can be a welded cover or a riveted cover. When the battery cover is a welded cover, the connecting block 6 is welded to the pole body 11. When the battery cover is a riveted cover, the connecting 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 a 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.

[0047] In addition, the isolation rubber sleeve 3 is made of a material with a heat resistance temperature greater than 200 °C, such as PC / PBT, etc., to prevent the heat transferred to the isolation rubber sleeve 3 during the welding of the tab and the pole bottom plate 12 from melting the isolation rubber sleeve 3, thereby reducing the gap between the pole bottom plate 12 and the first insulating member 2 and causing the first insulating member 2 to deform due to heat.

[0048] Among them, the shape of the welding mark 100 for welding the tab and the pole bottom plate 12 can be freely set according to requirements. In this embodiment, a strip-shaped welding mark 100 is used to realize the welding of the tab and the pole bottom plate 12, and this battery cover plate can be applied to different battery types, such as blade batteries, square shell batteries, large cylindrical batteries, etc. In this embodiment, the battery cover plate is adapted to a blade battery.

[0049] Optionally, as Figure 3 、 Figure 4 shown, the thickness dimension T of the first isolation part 32 in the first direction satisfies 0.35 mm ≤ T ≤ 0.6 mm. By limiting the thickness dimension T of the first isolation part 32 in the first direction to satisfy 0.35 mm ≤ T ≤ 0.6 mm, on the one hand, it is avoided that the thickness of the first isolation part 32 is too small, resulting in too small a height of the heat insulation cavity formed between the pole bottom plate 12 and the first insulating member 2 and poor heat insulation ability, unable to provide effective heat insulation protection for the first insulating member 2. On the other hand, it is avoided that the thickness dimension of the first isolation part 32 is too large, resulting in an increase in the overall height dimension of the battery cover plate, occupying more space, causing the pole group to be compressed and reducing the power supply capacity.

[0050] Among them, the thickness dimension T of the first isolation part 32 in the first direction can be any value between 0.35 mm and 0.6 mm or the range between any two values, such as 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.55 mm, 0.6 mm, etc.

[0051] In this embodiment, in order to verify the relationship between the projected area S1 of the welding mark 100 in the first direction on the pole bottom plate 12 and the projected area S2 of the first isolation part 32 in the first direction on the pole bottom plate 12, as well as the thickness dimension T of the first isolation part 32 in the first direction and the thermal influence on the first insulating member 2 during the welding of the tab and the pole bottom plate 12, as shown in Table 1, eight sets of examples and eight sets of comparative examples are provided for verification.

[0052] Table 1

[0053]

[0054] As can be seen from Examples 1 to 8 in Table 1, when the relationship between the projected area S1 of the welding mark 100 in the first direction on the pole column base plate 12 and the projected area S2 of the first isolation part 32 in the first direction on the pole column base plate 12 satisfies the range value of 0.4 ≤ S2 / (S1 + S2) ≤ 0.6, and the thickness dimension T of the first isolation part 32 in the first direction satisfies 0.35 mm ≤ T ≤ 0.6 mm, at this time, the heat insulation cavity formed between the first insulating part 2 and the pole column base plate 12 has a good heat insulation effect, and the isolation rubber sleeve 3 also has sufficient supporting strength for the pole column base plate 12 during welding. Therefore, no thermal melting marks are found on the first insulating part 2 after the pole ear is welded to the pole column base plate 12, and the pole column base plate 12 does not deform.

[0055] As can be seen from Comparative Example 1 and Comparative Example 2 in Table 1, when the relationship between the projected area S1 of the welding mark 100 in the first direction on the pole column base plate 12 and the projected area S2 of the first isolation part 32 in the first direction on the pole column base plate 12 is less than the minimum value of 0.4 ≤ S2 / (S1 + S2) ≤ 0.6, at this time, the contact area between the first isolation part 32 and the pole column base plate 12 is insufficient, and it is unable to provide effective support for the pole column base plate 12, resulting in excessive suspension area of the pole column base plate 12 during welding and thus deformation due to stress.

[0056] As can be seen from Comparative Example 3 and Comparative Example 4 in Table 1, when the relationship between the projected area S1 of the welding mark 100 in the first direction on the pole column base plate 12 and the projected area S2 of the first isolation part 32 in the first direction on the pole column base plate 12 is greater than the maximum value of 0.4 ≤ S2 / (S1 + S2) ≤ 0.6, at this time, the projected area of the first isolation part 32 in the first direction is too large, resulting in too small a space for the heat insulation cavity formed between the pole column base plate 12 and the first insulating part 2 in the area corresponding to the welding mark 100, thereby reducing the heat insulation effect and causing thermal melting marks to appear on the first insulating part 2.

[0057] As can be seen from Comparative Example 5 and Comparative Example 6 in Table 1, when the thickness dimension T of the first isolation part 32 in the first direction is less than the minimum value of 0.35 mm ≤ T ≤ 0.6 mm, at this time, the thickness of the first isolation part 32 is too small, resulting in too small a height of the heat insulation cavity formed between the pole column base plate 12 and the first insulating part 2, poor heat insulation ability, and unable to provide effective heat insulation protection for the first insulating part 2, causing thermal melting marks to appear on the first insulating part 2.

[0058] As can be seen from Comparative Example 7 and Comparative Example 8 in Table 1, when the thickness dimension T of the first isolation part 32 in the first direction is greater than the maximum value of 0.35 mm ≤ T ≤ 0.6 mm, the thickness dimension of the first isolation part 32 is too large at this time, resulting in an increase in the overall height dimension of the battery cover plate, occupying more space, causing the electrode group to be compressed, and reducing the power supply capacity.

[0059] Optionally, as Figure 2 shown, the width dimension of the projection of the first isolation part 32 in the first direction on the pole post bottom plate 12 is W, and 3 mm ≤ W ≤ 6 mm is satisfied. By limiting the width dimension W of the projection of the first isolation part 32 in the first direction on the pole post bottom plate 12 to satisfy 3 mm ≤ W ≤ 6 mm, on the one hand, it is avoided that the projection width of the first isolation part 32 in the first direction on the pole post bottom plate 12 is too small, resulting in too small contact area between the first isolation part 32 and the pole post bottom plate 12, unable to provide effective support for the pole post bottom plate 12, so that during welding, due to too large a suspended area of the pole post bottom plate 12, it is deformed by force, reducing the welding quality. On the other hand, it is avoided that the projection width of the first isolation part 32 in the first direction on the pole post bottom plate 12 is too large, resulting in compression of the area of the avoidance through hole 33 and reducing the heat dissipation effect.

[0060] Optionally, as Figure 3 、 Figure 4 shown, the first isolation part 32 extends in the first direction along the direction close to the pole ear to form a second isolation part 34 covering the outer side wall of the pole post bottom plate 12. The length dimension of the second isolation part 34 extending in the first direction is H1, and the thickness dimension of the pole post bottom plate 12 in the first direction is H2, and 0.2 mm ≤ H2 - H1 ≤ 0.4 mm is satisfied. By making the first isolation part 32 extend in the first direction along the direction close to the pole ear to form a second isolation part 34 covering the outer side wall of the pole post bottom plate 12, the contact area between the isolation rubber sleeve 3 and the pole post bottom plate 12 is increased, thereby increasing the connection strength between the isolation rubber sleeve 3 and the pole post bottom plate 12, avoiding the separation of the isolation rubber sleeve 3 and the pole post bottom plate 12, and by limiting the difference between the length dimension H1 of the second isolation part 34 extending in the first direction and the thickness dimension H2 of the pole post bottom plate 12 in the first direction, making the two satisfy 0.2 mm ≤ H2 - H1 ≤ 0.4 mm, so that on the one hand, it is avoided that the difference between the two is too small, making the second isolation part 34 too close to the surface where the pole ear is welded to the pole post bottom plate 12, resulting in interference during the welding of the pole ear and the pole post bottom plate 12, and on the other hand, it is avoided that the difference between the two is too small, reducing the contact area between the second isolation part 34 and the pole post bottom plate 12, resulting in poor fixing strength between the two.

[0061] Optionally, as Figure 3 、 Figure 4As shown, the length dimension H1 of the second isolating portion 34 extending along the first direction satisfies 1mm≤H1≤2.5mm. By limiting the length dimension H1 of the second isolating portion 34 extending along the first direction to satisfy 1mm≤H1≤2.5mm, on the one hand, it is prevented that the length of the second isolating portion 34 extending is too small, and the contact area between the second isolating portion 34 and the outer wall of the pole bottom plate 12 is reduced, resulting in insufficient connection strength; on the other hand, it is prevented that the length of the second isolating portion 34 extending is too large, and it is too close to the surface of the pole bottom plate 12 welded to the pole ear, thereby causing interference.

[0062] The length dimension H1 of the second isolation portion 34 extending along the first direction may be any value between 1 mm and 2.5 mm or a range between any two values, such as 1 mm, 1.5 mm, 2 mm, 2.5 mm, etc.

[0063] Alternatively, if Figure 3 , Figure 4 As shown, the thickness dimension H2 of the pole bottom plate 12 along the first direction satisfies 1.5 mm ≤ H2 ≤ 3 mm. By limiting the thickness dimension H2 of the pole bottom plate 12 along the first direction to satisfy 1.5 mm ≤ H2 ≤ 3 mm, on the one hand, it is avoided that the thickness dimension of the pole bottom plate 12 is too small, resulting in low structural strength, easy deformation under the pressure of the welding tooling, and affecting the welding quality; on the other hand, it is avoided that the thickness of the pole bottom plate 12 is too large, resulting in structural redundancy and waste of materials.

[0064] The thickness dimension H2 of the pole bottom plate 12 along the first direction may be any value between 1.5 mm and 3 mm or a range between any two values, such as 1.5 mm, 2 mm, 2.5 mm, 3 mm, etc.

[0065] Alternatively, if Figure 5 , Figure 6 As shown, the pole bottom plate 12 includes a first connecting plate 121, a second connecting plate 122 and a fuse plate 123, the fuse plate 123 is connected between the first connecting plate 121 and the second connecting plate 122, the pole body 11 is connected to the first connecting plate 121, the second connecting plate 122 is connected to the pole ear on the side away from the pole body 11, the connecting portion 31 is sleeved on the outside of the fuse plate 123, and the first isolating portion 32 is clamped between the second connecting plate 122 and the first insulating member 2.

[0066] The pole column base plate 12 is composed of a first connecting plate 121, a second connecting plate 122 and a fusing insurance plate 123. When a short circuit occurs, the high temperature generated causes the fusing insurance plate 123 to fuse, so as to disconnect the pole column body 11 connected to the first connecting plate 121 from 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 by the fusing insurance plate 123, its heat conduction ability has a smaller heat dissipation area compared with the pole column base plate 12 composed of an integral metal plate, so the heat conduction ability is worse. Therefore, the isolation rubber sleeve 3 is used to form a heat insulation cavity at the area of the pole column base plate 12 corresponding to the welding mark 100 of the first insulating part 2, so as to reduce the heat influence of the high temperature generated when the second connecting plate 122 is welded to the pole ear on the first insulating part 2. And because the connecting part 31 is sleeved on the outer side of the fusing insurance plate 123, on the one hand, it plays an insulating protection role to avoid the arcing phenomenon due to the too small gap between the first connecting plate 121 and the second connecting plate 122. On the other hand, when a short circuit occurs, because the connecting part 31 is sleeved on the outer side of the fusing insurance plate 123, the residue after the fusing insurance plate 123 melts is prevented from falling into the battery interior and causing damage.

[0067] In this embodiment, the conductive pole column 1 provided with the fusing insurance plate 123 is generally the positive pole column. Because the negative pole ear is generally made of copper, the negative pole column connected to the negative pole ear is generally also made of copper. And the thermal conductivity of copper is higher, so there is no need to set the fusing insurance plate 123 on the negative pole column to avoid waste of resources and reduce the manufacturing cost. In order to prevent the fusing insurance plate 123 from melting when the pole ear is welded to the pole column base plate 12, the melting point of the fusing insurance plate 123 is greater than the temperature when the pole ear is welded to the pole column base plate 12 and not greater than the temperature when a short circuit occurs.

[0068] Optionally, as Figure 5 shown, a blocking through groove 124 is formed on the fusing insurance plate 123. By forming the blocking through groove 124 on the fusing insurance plate 123, the cross-sectional area on the fusing insurance plate 123 is reduced, so that when a short circuit occurs, due to the smaller cross-section, the heat generation is accelerated, and thus the fusing is advanced in advance, and its protection performance is better. However, because the cross-sectional area of the fusing insurance plate 123 is smaller after the blocking through groove 124 is formed, it is more necessary to use the isolation rubber sleeve 3 to form a heat insulation cavity at the area of the pole column base plate 12 corresponding to the welding mark 100 of the first insulating part 2, so as to reduce the heat influence of the high temperature generated when the second connecting plate 122 is welded to the pole ear on the first insulating part 2.

[0069] Optionally, as Figure 1As shown, the isolation rubber sleeve 3 is injection-molded on the pole bottom plate 12. By directly forming the isolation rubber sleeve 3 on the pole group bottom plate through the injection molding process, the processing difficulty is reduced and the processing cost is lowered. In this embodiment, when the isolation colloid is formed on the pole bottom plate 12 by the injection molding process, a connecting portion 31, a first isolation portion 32, and a second isolation portion 34 are simultaneously formed.

[0070] In this embodiment, a battery is further provided. The battery includes a pole group, a battery housing, and the above-mentioned battery cover plate. The battery housing is a cavity structure with an open mouth, and the battery cover plate is arranged at the open mouth of the battery housing to close the battery housing and form a receiving cavity for accommodating the pole group. By applying the above-mentioned battery cover plate, the battery not only reduces the probability of short circuit and improves the product quality, but also greatly improves the assembly speed, shortens the assembly cycle, and increases the production capacity due to the improvement of the assembly processability.

[0071] Obviously, the above embodiments of the present invention are merely 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 within 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 mark 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, in which an insertion through hole is formed, and the insertion through hole is inserted with the post body. An isolation rubber sleeve, which includes a connecting portion and a first isolation portion. A connecting through hole is formed in the connecting portion, the post bottom plate is inserted into the connecting through hole, the first isolation portion is disposed between the post bottom plate and the first insulating member, and an avoidance through hole is formed. A projection of the welding mark on the post bottom plate along a first direction is located within a projection of the avoidance through hole on the post bottom plate along the first direction. A projection area of the welding mark on the post bottom plate along the first direction is S1, a projection area of the first isolation portion on the post bottom plate along the first direction is S2, and 0.4 ≤ S2 / (S1 + S2) ≤ 0.6 is satisfied.

2. The battery cover plate according to claim 1, characterized in that, A thickness dimension of the first isolation portion along the first direction is T, and 0.35 mm ≤ T ≤ 0.6 mm is satisfied.

3. The battery cover plate according to claim 1, wherein, A width dimension of a projection of the first isolation portion on the post bottom plate along the first direction is W, and 3 mm ≤ W ≤ 6 mm is satisfied.

4. The battery cover plate according to claim 1, characterized in that, The first isolation portion extends along the first direction in a direction close to the tab to form a second isolation portion covering an outer sidewall of the post bottom plate. A length dimension of the second isolation portion extending along the first direction is H1, a thickness dimension of the post bottom plate along the first direction is H2, and 0.2 mm ≤ H2 - H1 ≤ 0.4 mm is satisfied.

5. The battery cover plate according to claim 4, characterized in that, The length dimension H1 of the second isolation portion extending along the first direction satisfies 1 mm ≤ H1 ≤ 2.5 mm.

6. The battery cover plate according to claim 4, wherein, The thickness dimension H2 of the post bottom plate along the first direction satisfies 1.5 mm ≤ H2 ≤ 3 mm.

7. 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 insurance plate. The fusing insurance plate is connected between the first connecting plate and the second connecting plate. The post body is connected to the first connecting plate. A side of the second connecting plate facing away from the post body is connected to the tab. The connecting portion is sleeved outside the fusing insurance plate, and the first isolation portion is clamped between the second connecting plate and the first insulating member.

8. The battery cover plate according to claim 7, characterized in that A blocking through groove is formed in the fusing insurance plate.

9. The battery cover plate according to claim 1, characterized in that, The isolation rubber sleeve is injection-molded on the post bottom plate.

10. A battery, characterized in that, The battery includes a pole group, 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 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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