Battery cover plate and battery

Abstract

The invention belongs to the technical field of batteries, and discloses a battery cover plate and a battery, the battery cover plate comprises a conductive pole, a first insulating part and a high-temperature-resistant patch, the conductive pole comprises a pole main body and a pole bottom plate, the first insulating part is provided with a plugging through hole and a containing groove, and the high-temperature-resistant patch is arranged in the plugging through hole; the containing groove comprises a first wall surface opposite to the pole bottom plate in the first direction, the high-temperature-resistant patch comprises a patch body, the patch body is arranged on the surface, opposite to the first wall surface, of the pole bottom plate, and the distance L1 between the patch body and the first wall surface in the first direction is larger than 0 mm and smaller than or equal to 0.1 mm. The high-temperature-resistant patch is coated on the pole bottom plate, so that the first thermal isolation is realized, the distance L1 between the patch main body and the first wall surface is limited, the air thermal insulation layer is formed between the patch main body and the first wall surface to realize the second thermal isolation, and the thermal influence on the first insulating part during welding is greatly reduced by utilizing the dual thermal isolation.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular 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 a laser welding process, the heat generated during the welding process will cause the temperature of the conductive electrode post to rise rapidly, resulting in too high a 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 reduction in thickness, having a high short-circuit risk and poor insulation protection, but also change the outer dimension 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, which have good insulation protection and 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 the post bottom plate is welded to the tab;

[0008] A first insulating member, a plugging through hole inserted with the post main body and a receiving groove for receiving the post bottom plate are formed on the first insulating member, and the receiving groove includes a first wall surface opposite to the post bottom plate along a first direction;

[0009] A high-temperature resistant patch, the high-temperature resistant patch includes a patch main body, the patch main body is disposed on a surface of the post bottom plate opposite to the first wall surface, and the distance dimension between the patch main body and the first wall surface along the first direction is L1, and 0mm < L1 ≤ 0.1mm is satisfied.

[0010] Optionally, the thickness dimension of the patch body in the first direction is T1, and 0.1 mm ≤ T1 ≤ 0.8 mm is satisfied.

[0011] Optionally, the receiving groove includes a second wall surface opposite to the pole post bottom plate in the second direction, the high-temperature resistant patch further includes a first ear patch, the first ear patch is disposed on the surface of the pole post bottom plate opposite to the second wall surface, and the spacing dimension between the first ear patch and the second wall surface in the second direction is L2, and 0.2 mm ≤ L2 ≤ 0.3 mm is satisfied.

[0012] Optionally, the receiving groove includes a third wall surface opposite to the pole post bottom plate in the third direction, the high-temperature resistant patch further includes a second ear patch, the second ear patch is disposed on the surface of the pole post bottom plate opposite to the third wall surface, and the spacing dimension between the second ear patch and the third wall surface in the third direction is L3, 0.1 mm ≤ L3 ≤ 0.2 mm is satisfied, and L3 < L2.

[0013] Optionally, the thickness dimension of the first ear patch in the second direction is T2, the thickness dimension of the second ear patch in the third direction is T3, and 0.1 mm ≤ T2 = T3 ≤ 0.5 mm is satisfied.

[0014] Optionally, the battery cover plate further includes a cover plate body, the first insulating member is disposed between the cover plate body and the pole post bottom plate, and the thickness dimension between the surface of the first insulating member in contact with the cover plate body and the first wall surface in the first direction is t1, and t1 ≥ 0.5 mm is satisfied.

[0015] Optionally, the pole post bottom plate includes a first connecting plate, a second connecting plate and a fusing structure, the first connecting plate is connected to the pole post body, the second connecting plate is welded to the pole ear on the side facing away from the first insulating member, and the fusing structure is disposed between the first connecting plate and the second connecting plate.

[0016] Optionally, a blocking through groove is formed in the fusing structure.

[0017] Optionally, the conducting pole post further includes an insulating rubber sleeve, and the insulating rubber sleeve is sleeved outside the fusing structure.

[0018] 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 provided with an opening, the battery cover plate is disposed at the opening of the battery housing to seal the battery housing for forming a receiving cavity for accommodating the pole group.

[0019] Advantages of the present invention:

[0020] The present invention provides a battery cover plate. By arranging a patch body of a high-temperature resistant patch between the pole post bottom plate and the first wall surface, a first thermal isolation is formed between the pole post bottom plate and the first wall surface of the accommodating groove of the first insulating member, reducing the heat transferred to the first insulating member during the welding of the pole post bottom plate and the pole ear. And a spacing dimension L1 is arranged between the patch body and the first wall surface in the first direction, so that there is a gap between the patch body of the high-temperature resistant patch and the first wall surface of the first insulating member, forming an air heat insulation layer to achieve a second thermal isolation in the first direction, further reducing the heat transferred to the first insulating member in the first direction during the welding of the pole post bottom plate and the pole ear. The use of double thermal isolation greatly reduces the thermal influence on the first insulating member during welding, thereby avoiding the deformation of the first insulating member due to high temperature, improving the insulation protection performance and the assembly processability. And by limiting the spacing dimension L1 to satisfy 0 mm < L1 ≤ 0.1 mm, it is avoided that the gap is too large, resulting in too large a suspended distance of the pole post bottom plate when using a welding tooling to realize the welding of the pole post bottom plate and the pole ear, causing damage.

[0021] The present invention also provides a battery. By applying the above battery cover plate, not only the probability of short circuit is 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

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

[0023] Figure 2 is a schematic structural view of the conductive pole post in the battery cover plate provided by the present invention;

[0024] Figure 3 is a schematic structural view of the first insulating member in the battery cover plate provided by the present invention;

[0025] Figure 4 is a partial structural cross-sectional view of the battery cover plate provided by the present invention;

[0026] Figure 5 is Figure 4 a magnified view of the structure of part A in

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

[0028] Figure 7 is Figure 6 a magnified view of the structure of part B in

[0029] Figure 8 is a plan view of the high-temperature resistant patch in the battery cover plate provided by the present invention.

[0030] In the figure:

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

[0032] 2. First insulating part; 21. Insertion through hole; 22. Accommodating groove; 221. First wall surface; 222. Second wall surface; 223. Third wall surface; 23. Limiting protrusion;

[0033] 3. High-temperature patch; 31. Patch body; 32. First ear patch; 33. Second ear patch;

[0034] 4. Cover plate body; 41. Connecting through hole;

[0035] 5. Second insulating part;

[0036] 6. Connecting block. Detailed implementation manners

[0037] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. Additionally, it should be noted that for the convenience of description, only parts related to the present invention rather than all structures are shown in the drawings.

[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 situations.

[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 between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above the top of", and "on the top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "below the bottom of", and "under the bottom of" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has 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 the convenience of description and simplifying the operations, 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. 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 meanings.

[0041] Since the plastic part is arranged between the pole post and the light aluminum plate, when the tab and the pole post are connected by welding, the high temperature generated causes the plastic part to be heated and deformed and extend horizontally. This not only results in a decrease in the thickness of the plastic part, increasing the probability of the plastic part being punctured and causing a short circuit, with a relatively high risk and poor insulation protection, but also because after the plastic part extends horizontally due to heat, the outer dimension of the battery cover plate will increase, 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 8 shown, the battery cover plate includes a conductive pole post 1, a first insulating part 2 and a high-temperature resistant patch 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. The pole post bottom plate 12 is welded to the tab. The first insulating part 2 is provided with an insertion through hole 21 inserted with the pole post main body 11 and a receiving groove 22 for receiving the pole post bottom plate 12. The receiving groove 22 includes a first wall surface 221 opposite to the pole post bottom plate 12 along a first direction. The high-temperature resistant patch 3 includes a patch main body 31. The patch main body 31 is arranged on the surface of the pole post bottom plate 12 opposite to the first wall surface 221. The spacing dimension L1 between the patch main body 31 and the first wall surface 221 along the first direction satisfies 0 mm < L1 ≤ 0.1 mm.

[0044] The battery cover plate forms a first thermal isolation between the pole post bottom plate 12 and the first wall surface 221 of the accommodating groove 22 of the first insulating member 2 by arranging the patch body 31 of the high-temperature resistant patch 3 between the pole post bottom plate 12 and the first wall surface 221, reducing the heat transferred to the first insulating member 2 during the welding of the pole post bottom plate 12 and the pole ear. And a spacing dimension L1 is set in the first direction between the patch body 31 and the first wall surface 221, so that there is a gap between the patch body 31 of the high-temperature resistant patch 3 and the first wall surface 221 of the first insulating member 2, forming an air heat insulation layer to achieve a second thermal isolation in the first direction, further reducing the heat transferred to the first insulating member 2 in the first direction during the welding of the pole post bottom plate 12 and the pole ear. The double thermal isolation greatly reduces the thermal influence on the first insulating member 2 during welding, thus avoiding the deformation of the first insulating member 2 due to high temperature, improving the insulation protection and assembly processability. And by limiting the spacing dimension L1 to satisfy 0mm < L1 ≤ 0.1mm, the excessive gap is avoided, so that when the pole post bottom plate 12 and the pole ear are welded by using a welding tooling, the suspended distance of the pole post bottom plate 12 is too large, resulting in damage.

[0045] The battery cover plate of this structure can adapt to different types of batteries by changing the number of conductive pole posts 1. When there is one conductive pole post 1 on the battery cover plate, the battery cover plate is adapted to a blade battery. When there are two conductive pole posts 1 on the battery cover plate, the battery cover plate is adapted to a square shell battery.

[0046] Optionally, the thickness dimension T1 of the patch body 31 in the first direction satisfies 0.1mm ≤ T1 ≤ 0.8mm.

[0047] By limiting the thickness dimension T1 of the patch body 31 in the first direction to satisfy 0.1mm ≤ T1 ≤ 0.8mm, on the one hand, it is avoided that the thickness of the patch body 31 is too small, resulting in poor heat insulation effect and the thermal deformation of the first wall surface 221. On the other hand, it is avoided that the thickness of the patch body 31 is too large, increasing the overall thickness of the battery cover plate. On the premise of ensuring that the overall battery external dimension remains unchanged, it leads to an increase in the occupied space, reducing the volume of the electrode group and the power supply capacity.

[0048] Wherein, the thickness dimension T1 of the patch body 31 in the first direction can be any value between 0.1mm and 0.8mm or the range between any two values, such as 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.7mm, 0.7mm, 0.8mm, etc.

[0049] Optionally, as Figure 6 、 Figure 7As shown, the accommodating groove 22 includes a second wall surface 222 opposite to the pole column bottom plate 12 in the second direction. The high-temperature resistant patch 3 further includes a first ear patch 32. The first ear patch 32 is disposed on the surface of the pole column bottom plate 12 opposite to the second wall surface 222. The spacing dimension L2 between the first ear patch 32 and the second wall surface 222 in the second direction satisfies 0.2 mm ≤ L2 ≤ 0.3 mm.

[0050] By arranging the first ear patch 32 of the high-temperature resistant patch 3 between the pole column bottom plate 12 and the second wall surface 222 of the accommodating groove 22 of the first insulating member 2, a first layer of thermal insulation is formed between the pole column bottom plate 12 and the second wall surface 222 of the first insulating member 2, reducing the heat transferred to the first insulating member 2 during the welding of the pole column bottom plate 12 and the pole ear. And by setting the spacing dimension L2 between the first ear patch 32 and the second wall surface 222 in the second direction, a gap is left between the first ear patch 32 of the high-temperature resistant patch 3 and the second wall surface 222 of the first insulating member 2 to form an air heat insulation layer, so as to achieve a second layer of thermal insulation in the second direction, further reducing the heat transferred to the first insulating member 2 in the second direction during the welding of the pole column bottom plate 12 and the pole ear. The use of double thermal insulation greatly reduces the thermal influence on the first insulating member 2 during welding, thus avoiding the deformation of the first insulating member 2 due to high temperature, improving the insulation protection performance and assembly processability. And by limiting the spacing dimension L2 to satisfy 0.2 mm ≤ L2 ≤ 0.3 mm, on the one hand, it avoids the air heat insulation layer being too thin due to too small a gap, resulting in limited heat insulation ability, and on the other hand, it avoids too large a gap, which may cause the first insulating member 2 to be misaligned after assembly, resulting in poor assembly.

[0051] Wherein, the spacing dimension L2 arranged between the first ear patch 32 and the second wall surface 222 in the second direction can be any value between 0.2 mm and 0.3 mm or the range between any two values, such as 0.2 mm, 0.25 mm, 0.3 mm, etc.

[0052] Optionally, as Figure 6 、 Figure 7As shown, the accommodating groove 22 includes a third wall surface 223 opposite to the pole post base plate 12 in the third direction. The high-temperature resistant patch 3 further includes a second ear patch 33. The second ear patch 33 is disposed on the surface of the pole post base plate 12 opposite to the third wall surface 223. The spacing dimension L3 between the second ear patch 33 and the third wall surface 223 in the third direction satisfies 0.1mm ≤ L3 ≤ 0.2mm, and L3 < L2. By providing the second ear patch 33 of the high-temperature resistant patch 3 between the pole post base plate 12 and the third wall surface 223 of the accommodating groove 22 of the first insulating member 2, a first layer of thermal isolation is formed between the pole post base plate 12 and the third wall surface 223 of the accommodating groove 22 of the first insulating member 2, reducing the heat transferred to the first insulating member 2 during the welding of the pole post base plate 12 and the pole ear. And by setting the spacing dimension L3 in the third direction between the second ear patch 33 and the third wall surface 223, a gap is left between the second ear patch 33 of the high-temperature resistant patch 3 and the third wall surface 223 of the first insulating member 2 to form an air heat insulation layer, so as to achieve a second layer of thermal isolation in the third direction, further reducing the heat transferred to the first insulating member 2 in the third direction during the welding of the pole post base plate 12 and the pole ear. The use of double thermal isolation greatly reduces the thermal influence on the first insulating member 2 during welding, thus avoiding the deformation of the first insulating member 2 due to high temperature, improving the insulation protection and assembly processability. And by limiting the spacing dimension L3 to satisfy 0.1mm ≤ L3 ≤ 0.2mm, on the one hand, it avoids the air heat insulation layer formed due to too small a gap being too thin and having limited heat insulation ability, and on the other hand, it avoids too large a gap, resulting in too large a gap after assembly, and the first insulating member 2 is prone to dislocation, resulting in poor assembly.

[0053] Wherein, the spacing dimension L3 set between the second ear patch 33 and the third wall surface 223 in the third direction can be any value between 0.1mm and 0.2mm or the range between any two values, such as 0.1mm, 0.15mm, 0.2mm, etc.

[0054] In addition, since the welding track extends along the third direction when welding the pole ear and the pole post base plate 12, during the welding process, the second wall surface 222 of the accommodating groove 22 is always in a heated state, while the influence of temperature on the third wall surface 223 of the accommodating groove 22 during the welding process increases as the welding track extends along the third direction, so that the heating time of the third wall surface 223 is shorter than that of the second wall surface 222. Therefore, by making the spacing dimension L2 between the first ear patch 32 and the second wall surface 222 in the second direction greater than the spacing dimension L3 between the second ear patch 33 and the third wall surface 223 in the third direction, it can not only ensure that the thermal influence on the second wall surface 222 and the third wall surface 223 is small, but also avoid the size of the accommodating groove 22 opened on the first insulating member 2 being too large, causing design redundancy and wasting space and cost.

[0055] It can be seen from this that the high-temperature resistant patch 3 composed of the patch body 31, the first ear patch 32 and the second ear patch 33 can protect multiple wall surfaces of the accommodation groove 22 opened in the first insulating member 2, and reduce the thermal influence on the first insulating member 2 when the ear and the pole column bottom plate 12 are welded.

[0056] Optionally, as Figure 8 shown, the thickness dimension T2 of the first ear patch 32 in the second direction is T2, and the thickness dimension T3 of the second ear patch 33 in the third direction is T3, and 0.1 mm ≤ T2 = T3 ≤ 0.5 mm is satisfied.

[0057] By limiting the thickness dimension T2 of the first ear patch 32 in the second direction and the thickness dimension T3 of the second ear patch 33 in the third direction, so that 0.1 mm ≤ T2 = T3 ≤ 0.5 mm is satisfied. On the one hand, it is avoided that the thicknesses of the first ear patch 32 and the second ear patch 33 are too small, resulting in poor heat insulation effect, and the second wall surface 222 and the third wall surface 223 are deformed by heat. On the other hand, it is avoided that the thicknesses of the first ear patch 32 and the second ear patch 33 are too large, resulting in an increase in the overall outer dimension of the battery cover plate. On the premise of ensuring that the overall battery outer dimension remains unchanged, it leads to an increase in the difficulty of inserting the battery cover plate into the shell, which is not conducive to assembly.

[0058] Among them, the thickness dimension T2 of the first ear patch 32 in the second direction and the thickness dimension T3 of the second ear patch 33 in the third direction can be any value between 0.1 mm and 0.5 mm or the range between any two values, such as 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, etc.

[0059] Optionally, as Figure 5 shown, the battery cover plate further includes a cover plate body 4. The first insulating member 2 is arranged between the cover plate body 4 and the pole column bottom plate 12. The thickness dimension t1 in the first direction between the surface of the first insulating member 2 in contact with the cover plate body 4 and the first wall surface 221 satisfies t1 ≥ 0.5 mm.

[0060] By limiting the thickness dimension t1 in the first direction between the surface of the first insulating member 2 in contact with the cover plate body 4 and the first wall surface 221, so that t1 ≥ 0.5 mm is satisfied, thereby avoiding that the material thickness between the surface of the first insulating member 2 in contact with the cover plate body 4 and the first wall surface 221 is too small, resulting in the first insulating member 2 being easily broken down by current and causing a short circuit.

[0061] In this embodiment, the battery cover plate further includes a second insulating member 5 and a connecting block 6. A connecting through hole 41 corresponding to the insertion through hole 21 is formed in the cover plate body 4. One end of the pole column main body 11 passing through the insertion through hole 21 is inserted into the connecting through hole 41 and connected to the connecting block 6. The second insulating member 5 is disposed on the side of the cover plate body 4 facing away from the first insulating member 1 and is used to achieve insulation protection among the cover plate body 4, the pole column main body 11, and the connecting block 6. The battery cover plate can be a welded cover plate or a riveted cover plate. When the battery cover plate is a welded cover plate, the connecting block 6 is welded to the pole column main body 11. When the battery cover plate is a riveted cover plate, the connecting block 6 is riveted to the pole column main body 11.

[0062] Optionally, the pole column 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 column main body 11. The side of the second connecting plate 122 facing away from the first insulating member 2 is welded to the pole ear. The fusing structure 123 is disposed between the first connecting plate 121 and the second connecting plate 122.

[0063] The pole column bottom 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 high temperature generated is used to fuse the fusing structure 123, so that the pole column main body 11 connected to the first connecting plate 121 is disconnected 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 through the fusing structure 123, its heat conduction ability has a smaller heat dissipation area and worse heat conduction ability compared with the pole column bottom plate 12 formed by an integral metal plate. Therefore, high-temperature patches 3 are provided between the pole column bottom plate 12 and the various wall surfaces of the receiving groove 22, so as to reduce the thermal influence on the insulating body during the welding operation, avoid deformation of the first insulating member 2 due to excessive temperature, and improve the insulation performance and assembly processability.

[0064] In this embodiment, the conductive pole column 1 provided with the fusing structure 123 is generally a 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. Therefore, there is no need to provide a fusing structure 123 on the negative pole column to avoid waste of resources and reduce the manufacturing cost. In order to prevent the fusing structure 123 from melting during the welding of the pole ear and the pole column 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 column bottom plate 12 and not greater than the temperature during a short circuit.

[0065] Optionally, as Figure 2As shown, a blocking through groove 124 is provided on the fusing structure 123. By providing the blocking through groove 124 on the fusing structure 123, the cross-sectional area of the fusing structure 123 is reduced, so that the fusing structure 123 can be quickly fused in case of a short circuit, 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 provided, it is more necessary to effectively reduce the thermal influence of high temperature on the first insulating member 2 by using the double heat insulation formed by the cooperation of the high-temperature resistant patch 3, the spacing dimension L1, the spacing dimension L2 and the spacing dimension L3.

[0066] Optionally, as Figure 1 shown, the battery cover plate further includes an insulating rubber sleeve 13, and the insulating rubber sleeve 13 is arranged outside the fusing structure 123. By arranging the insulating rubber sleeve 13 outside the fusing structure 123, on the one hand, it plays an insulating and protective 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, in case of a short circuit, since the insulating rubber sleeve 13 is arranged outside the fusing structure 123, the residue after the fusing structure 123 melts can be prevented from falling into the battery interior and causing damage.

[0067] Optionally, a plurality of limiting protrusions 23 abutting against the pole post base plate 12 are symmetrically distributed on the second wall surface 222. By providing the limiting protrusions 23 abutting against the pole post base plate 12 on the two second wall surfaces 222, the position of the pole post base plate 12 is limited and fixed, so as to avoid the problem of poor welding caused by the displacement of the pole post base plate 12 during the welding of the pole post base plate 12 and the pole ear.

[0068] In this embodiment, since the pole post base plate 12 includes a first connecting plate 121 and a second connecting plate 122, it is necessary to provide the limiting protrusions 23 respectively abutting against the first connecting plate 121 and the second connecting plate 122 on the second wall surface 222 to ensure the firmness of the fixation with the pole post base plate 12. The number of the limiting protrusions 23 provided on a single second wall surface 222 can be freely selected according to requirements. For example, in this embodiment, three limiting protrusions 23 are provided on each second wall surface 222 to abut against the first connecting plate 121, and one limiting protrusion 23 is provided to abut against the second connecting plate 122. The reason why the number of the limiting protrusions 23 abutting against the first connecting plate 121 is greater than the number of the limiting protrusions 23 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, so as to avoid the limiting protrusions 23 from melting due to heat and resulting in ineffective fixation of the pole post base plate 12.

[0069] Among them, in order to verify the spacing dimension L1 between the patch body 31 and the first wall surface 221 in the first direction, the spacing dimension L2 between the first ear patch 32 and the second wall surface 222 in the second direction, the spacing dimension L3 between the second ear patch 33 and the third wall surface 223 in the third direction, the thickness dimension T1 of the patch body 31 in the first direction, the thickness dimension T2 of the first ear patch 32 in the second direction, and the thickness dimension T3 of the second ear patch 33 in the third direction, as well as the thermal influence on the first insulator 2 when the tab is welded to the tab bottom plate 12, as shown in Table 1, six groups of examples and six groups of comparative examples are provided for verification. Among them, the conducting electrode post 1 is the positive electrode post welded to the positive tab. A fusing structure 123 is provided on the tab bottom plate 12 of the conducting electrode post 1. The material of the first insulator 2 in contact with the tab bottom plate 12 is the industry-standard material PP (melting point temperature 160°C - 170°C). The welding power of the tab to the tab bottom plate 12 is 1000W for all cases.

[0070] Table 1

[0071]

[0072] As can be seen from Examples 1 to 6, when the spacing dimension L1 between the high-temperature resistant patch 3 and the first wall surface 221 in the first direction satisfies the range of 0mm < L1 ≤ 0.1mm, the spacing dimension L2 between the high-temperature resistant patch 3 and the second wall surface 222 in the second direction satisfies the range of 0.2mm ≤ L2 ≤ 0.3mm, the spacing dimension L3 between the high-temperature resistant patch 3 and the third wall surface 223 in the third direction satisfies the range of 0.1mm ≤ L3 ≤ 0.2mm, the thickness dimension T1 of the part of the high-temperature resistant patch 3 between the first wall surface 221 and the tab bottom plate 12 in the first direction satisfies the range of 0.1mm ≤ T1 ≤ 0.8mm, the thickness dimension T2 of the part of the high-temperature resistant patch 3 between the second wall surface 222 and the tab bottom plate 12 in the second direction satisfies the range of 0.1mm ≤ T2 ≤ 0.5mm, and the thickness dimension T3 of the part of the high-temperature resistant patch 3 between the third wall surface 223 and the tab bottom plate 12 in the third direction satisfies the range of 0.1mm ≤ T3 ≤ 0.5mm, at this time, regardless of the thickness of each part of the high-temperature resistant patch 3 and the gap between the high-temperature resistant patch 3 and each wall surface of the receiving groove 22, the heat insulation requirements are met. Therefore, under the action of double heat insulation, no traces of melting are found on each wall surface of the receiving groove 22 on the first insulator 2.

[0073] As can be seen from the comparison between Comparative Example 1 and Example 1, when the spacing dimension L1 between the high-temperature resistant patch 3 and the first wall surface 221 in the first direction is greater than the maximum value of 0mm < L1 ≤ 0.1mm, at this time, the gap between the tab bottom plate 12 and the first wall surface 221 is too large, resulting in deformation of the tab bottom plate 12 when the tooling for welding the tab is pressed on the tab bottom plate 12, thereby causing damage to the tab bottom plate 12.

[0074] From the comparison between Comparative Example 2 and Example 2, it can be seen that when the spacing dimension L2 in the second direction between the high-temperature resistant patch 3 and the second wall surface 222 is less than the minimum value of 0.2 mm ≤ L2 ≤ 0.3 mm, the spacing between the high-temperature resistant patch 3 and the second wall surface 222 is too close at this time, resulting in an overly thin air insulation layer formed therebetween. The high-temperature resistant patch 3 alone cannot effectively block the heat, thereby causing heat melting at the second wall surface 222.

[0075] From the comparison between Comparative Example 3 and Example 3, it can be seen that when the spacing dimension L3 in the third direction between the high-temperature resistant patch 3 and the third wall surface 223 is less than the minimum value of 0.1 mm ≤ L3 ≤ 0.2 mm, the spacing between the high-temperature resistant patch 3 and the third wall surface 223 is too close at this time, resulting in an overly thin air insulation layer formed therebetween. The high-temperature resistant patch 3 alone cannot effectively block the heat, thereby causing heat melting at the third wall surface 223.

[0076] From the comparison between Comparative Example 4 and Example 4, it can be seen that when the thickness dimension T1 in the first direction of the part of the high-temperature resistant patch 3 located between the first wall surface 221 and the pole post base plate 12 is less than the minimum value of 0.1 mm ≤ T1 ≤ 0.8 mm, the thickness of the part of the high-temperature resistant patch 3 located between the first wall surface 221 and the pole post base plate 12 is too thin at this time, resulting in heat melting at the first wall surface 221.

[0077] From the comparison between Comparative Example 5 and Example 5, it can be seen that when the thickness dimension T2 in the second direction of the part of the high-temperature resistant patch 3 located between the second wall surface 222 and the pole post base plate 12 is less than the minimum value of 0.1 mm ≤ T2 ≤ 0.5 mm, the thickness of the part of the high-temperature resistant patch 3 located between the second wall surface 222 and the pole post base plate 12 is too thin at this time, resulting in heat melting at the second wall surface 222.

[0078] From the comparison between Comparative Example 6 and Example 6, it can be seen that when the thickness dimension T3 in the third direction of the part of the high-temperature resistant patch 3 located between the third wall surface 223 and the pole post base plate 12 is less than the minimum value of 0.1 mm ≤ T3 ≤ 0.8 mm, the thickness of the part of the high-temperature resistant patch 3 located between the third wall surface 223 and the pole post base plate 12 is too thin at this time, resulting in heat melting at the third wall surface 223.

[0079] 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, so as to 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, thereby improving the product quality, but also greatly improves the assembly speed and shortens the assembly cycle due to the improvement of the assembly processability, thus improving the production capacity.

[0080] 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 the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. Battery cover plate, characterized in that, The battery cover comprises: A conductive electrode column, the conductive electrode column comprising a pole body and a pole bottom plate, the pole body is connected to the pole bottom plate, and the pole bottom plate is welded to the pole ear; A first insulating member, wherein the first insulating member is provided with an inserting through hole for inserting with the pole body and an accommodating groove for accommodating the pole bottom plate, and the accommodating groove includes a first wall surface opposite to the pole bottom plate along a first direction; A high temperature resistant patch, comprising a patch body, the patch body being arranged on the surface of the pole bottom plate opposite to the first wall surface, the spacing dimension between the patch body and the first wall surface along the first direction is L1, and satisfies 0mm<L1≤0.1mm.

2. The battery cover plate according to claim 1, wherein, The thickness dimension of the patch body along the first direction is T1, and satisfies 0.1 mm≤T1≤0.8 mm.

3. The battery cover plate according to claim 1, wherein, The accommodating groove includes a second wall surface opposite to the pole bottom plate along the second direction, and the high temperature resistant patch also includes a first ear patch, which is arranged on the surface of the pole bottom plate opposite to the second wall surface, and the spacing dimension between the first ear patch and the second wall surface along the second direction is L2, and satisfies 0.2mm≤L2≤0.3mm.

4. The battery cover plate according to claim 3, characterized in that The accommodating groove includes a third wall surface opposite to the pole bottom plate along a third direction, and the high temperature resistant patch also includes a second ear patch, which is arranged on the surface of the pole bottom plate opposite to the third wall surface, and the spacing dimension between the second ear patch and the third wall surface along the third direction is L3, satisfying 0.1mm≤L3≤0.2mm, and L3<L2.

5. The battery cover plate according to claim 4, characterized in that, A thickness dimension of the first ear patch along the second direction is T2, a thickness dimension of the second ear patch along the third direction is T3, and 0.1 mm ≤ T2 = T3 ≤ 0.5 mm is satisfied.

6. The battery cover plate according to claim 1, characterized in that, The battery cover also includes a cover body, the first insulating member is arranged between the cover body and the pole bottom plate, the thickness dimension along the first direction between the surface of the first insulating member abutting against the cover body and the first wall surface is t1, and t1≥0.5mm is satisfied.

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

8. The battery cover plate according to claim 7, characterized in that, The fuse structure is provided with a blocking groove.

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

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

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