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 and a conductive pole, the first insulating part is provided with an insertion through hole and a containing structure, the containing structure comprises a first groove and a second groove, the depth of the first groove in the first direction is larger than that of the second groove in the first direction, and the insertion through hole is communicated with the insertion through hole. The conductive pole comprises a pole main body and a pole bottom plate, the pole bottom plate is connected with the pole main body and is accommodated in the first groove, one side, deviating from the first insulating part, of the pole bottom plate is welded with one part of the tab, the other part of the tab exceeds the pole bottom plate, and a heat insulation gap is formed between the other part of the tab and the surface, facing the tab, of the first insulating part; and the first groove and the second groove form a clearance chamber. By forming the receding cavity, on one hand, direct contact between the first insulating part and the pole lug is avoided, and on the other hand, a large space is reserved between the pole lug and the first insulating part, so that the heat influence on the first insulating part when the pole lug and the pole bottom plate are welded is reduced.

Description

Technical Field

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

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

[0003] Among them, the explosion-proof valve is used to allow the high-temperature and high-pressure gas inside the battery to break through the explosion-proof valve when thermal runaway occurs inside the battery, so as to achieve the purpose of pressure relief and protection. The plastic part is used to insulate the conductive electrode post and the light aluminum plate, avoiding direct contact between the electrode post and the electrode tab and the light aluminum plate, and thus preventing short circuit. Therefore, the explosion-proof valve and the insulating part are important components to ensure the safe use of the battery.

[0004] Since a part of the electrode tab is welded to the conductive electrode post and the other part of the electrode tab directly abuts against the plastic part, when the electrode tab is welded to the conductive electrode post, the heat generated by the welding will cause the temperature of the electrode tab to rise rapidly, resulting in the plastic part in contact with the electrode tab being deformed by heat and extending horizontally. On the one hand, this causes the thickness of the plastic part to decrease, increasing the probability of the plastic part being punctured and causing a short circuit, and the insulation ability is poor. On the other hand, since the insulating part extends horizontally, the outer dimension of the battery cover plate will increase, resulting in the inability to be smoothly assembled into the shell, and the assembly processability is poor. Summary of the Invention

[0005] The purpose of the present invention is to provide a battery cover plate and a battery, which have good insulation protection and assembly processability.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] On the one hand, a battery cover plate is provided, and the battery cover plate includes:

[0008] A first insulating part, on which an insertion through hole and a receiving structure are provided. The receiving structure includes a first groove and a second groove. The first groove is provided on one side close to the insertion through hole, and the depth of the first groove in the first direction is greater than the depth of the second groove in the first direction;

[0009] The conductive electrode post, the conductive electrode post includes a post body and a post bottom plate, the post body is inserted into the insertion through hole, the post bottom plate is connected to the post body, the post bottom plate is accommodated in the first groove and protrudes from the first groove, one side of the post bottom plate facing away from the first insulating member is welded to a part of the tab and a connection weld mark is formed, another part of the tab extends beyond the post bottom plate along the second direction and crosses the second groove, and a part of the tab opposite to the second groove and the second groove form an avoidance cavity;

[0010] The distance dimension along the second direction between the boundary of the connection weld mark close to the avoidance cavity and the side wall of the avoidance cavity close to the connection weld mark is W1, and W1≥3mm is satisfied.

[0011] Optionally, the width dimension of the avoidance cavity along the second direction is W2, and 11mm≤W1+W2≤14mm is satisfied.

[0012] Optionally, a heat insulation gap is formed between a part of the tab that crosses the second groove and the surface of the first insulating member facing the tab, the length dimension of the heat insulation gap along the first direction is H1, and 0.2mm≤H1≤0.5mm is satisfied.

[0013] Optionally, the length dimension of the avoidance cavity along the first direction is H2, and 0.3mm≤H2-H1≤0.6mm is satisfied.

[0014] Optionally, the post bottom plate includes a first connecting plate, a second connecting plate and a fusing structure, the first connecting plate is connected to the post body, one side of the second connecting plate facing away from the first insulating member is welded to the tab, and the fusing structure is arranged between the first connecting plate and the second connecting plate.

[0015] Optionally, a blocking through groove is formed on the fusing structure.

[0016] Optionally, the conductive electrode post further includes an insulating rubber sleeve, and the insulating rubber sleeve is sleeved outside the fusing structure.

[0017] Optionally, a plurality of limiting protrusions abutting against the first connecting plate and the second connecting plate are symmetrically distributed on two wall surfaces of the first groove opposite to the post bottom plate along the third direction.

[0018] Optionally, the number of the limiting protrusions abutting against the first connecting plate is greater than the number of the limiting protrusions abutting against the second connecting plate.

[0019] On the other hand, a battery is provided, which includes a pole group, a battery housing, and the battery cover plate described in any one of the above. The battery housing is a cavity structure with an opening, and the battery cover plate is arranged at the opening of the battery housing to close the battery housing and form a cavity for accommodating the pole group.

[0020] Advantages of the present invention:

[0021] The present invention provides a battery cover plate. By arranging a receiving structure composed of a first groove and a second groove with different depths in the first insulating member in the battery cover plate, when the pole column bottom plate is accommodated in the first groove, a cavity for avoiding heat is formed by using the second groove and the area of the pole ear close to the welding mark. There is a relatively large space between the position of the pole ear close to the welding mark and the first insulating member, thereby reducing the thermal influence on the first insulating member when the pole ear and the pole column bottom plate are welded, and avoiding the thermal deformation of the first insulating member to a great extent, thus improving the insulation protection and assembly processability of the battery cover plate. In addition, by defining the distance dimension W1 in the second direction between the boundary of the connecting welding mark close to the cavity for avoiding heat and the side wall of the cavity for avoiding heat close to the connecting welding mark, making it satisfy W1≥3mm, avoiding the cavity for avoiding heat being too close to the welding mark, resulting in too high temperature in the cavity for avoiding heat and unable to play a good heat insulation effect between the first insulating member and the pole ear.

[0022] The present invention also provides a battery. By applying the above battery cover plate, not only the probability of short circuit and the occurrence of poor welding are 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. 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 cross-sectional structural view of the longitudinal section after the battery cover plate provided by the present invention is welded to the pole ear;

[0025] Figure 3 is Figure 2 an enlarged view of the structure of part F in

[0026] Figure 4 is a cross-sectional structural view of the cross-section after the battery cover plate provided by the present invention is welded to the pole ear;

[0027] Figure 5 is a structural view of the first insulating member in the battery cover plate provided by the present invention;

[0028] Figure 6 is a structural view of the conductive pole column in the battery cover plate provided by the present invention.

[0029] In the figure:

[0030] 100, tab; 200, heat insulation gap; 300, cavity avoidance chamber; 400, connecting weld mark;

[0031] 1, first insulating member; 11, insertion through hole; 12, accommodating structure; 121, first groove; 122, second groove; 123, limiting protrusion;

[0032] 2, conductive electrode post; 21, post main body; 22, post bottom plate; 221, first connecting plate; 222, second connecting plate; 223, fusing structure; 224, blocking through groove; 23, insulating rubber sleeve;

[0033] 3, cover body;

[0034] 4, second insulating member;

[0035] 5, connecting block. Specific embodiments

[0036] 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. In addition, it should be noted that for the convenience of description, only parts related to the present invention are shown in the drawings, rather than all structures.

[0037] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected", 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.

[0038] 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", and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "below", and "under" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicating that the first feature has a lower horizontal height than the second feature.

[0039] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0040] Since a part of the pole ear is welded to the conductive electrode column, and the other part of the pole ear directly abuts the plastic part, when the pole ear is welded to the conductive electrode column, the heat generated by the welding will cause the temperature of the pole ear to rise rapidly, thereby causing the plastic part abutting the pole ear to deform due to heat and extend in the horizontal direction. On the one hand, this causes the thickness of the plastic part to decrease, increasing the probability of the plastic part being punctured and causing a short circuit, and the insulation capacity is poor. On the other hand, since the insulating part is extended in the horizontal direction, the external dimensions of the battery cover will increase, making it impossible to smoothly insert the battery into the shell for assembly, and the assembly process is poor.

[0041] Therefore, in order to reduce the thermal impact on the plastic parts during welding and improve the insulation protection and assembly processability of the plastic parts, this embodiment provides a battery cover.

[0042] like Figures 1 to 6 As shown, the battery cover includes a first insulating member 1 and a conductive electrode 2, the first insulating member 1 is provided with a plug-in through hole 11 and a receiving structure 12, the receiving structure 12 includes a first groove 121 and a second groove 122, the first groove 121 is provided on a side close to the plug-in through hole 11, the depth of the first groove 121 along the first direction is greater than the depth of the second groove 122 along the first direction, the conductive electrode 2 includes a pole body 21 and a pole bottom plate 22, the pole body 21 is inserted into the plug-in through hole 11, the pole bottom plate 22 is connected to the pole body 21, and the pole bottom plate 22 is accommodated in the first groove 1 21, and the first groove 121 protrudes, the side of the pole bottom plate 22 away from the first insulating member 1 is welded to a part of the pole ear 100, and a connecting weld mark 400 is formed, and the other part of the pole ear 100 extends beyond the pole bottom plate 22 and crosses the second groove 122 along the second direction, and the part of the pole ear 100 opposite to the second groove 122 and the second groove 122 constitute an air-avoiding chamber 300, and the spacing dimension along the second direction between the connecting weld mark 400 close to the boundary of the air-avoiding chamber 300 and the side wall of the air-avoiding chamber 300 close to the connecting weld mark 400 is W1, and satisfies W1≥3mm.

[0043] The battery cover plate is provided with a receiving structure 12 composed of a first groove 121 and a second groove 122 of different depths in the first insulating member 1, so that when the pole bottom plate 22 is accommodated in the first groove 121, the second groove 122 and the area of the pole ear 100 close to the welding mark 400 are used to form an air-avoiding chamber 300, so that a large space is left between the position of the pole ear 100 close to the welding mark 400 and the first insulating member 1, thereby reducing the thermal influence of the pole ear 100 and the pole bottom plate 22 on the first insulating member 1 during welding, which greatly reduces the heat of the pole ear 100 and the pole bottom plate 22. The first insulating member 1 can be prevented from being deformed by heat to a certain extent, thereby improving the insulation protection and assembly processability of the battery cover. In addition, by limiting the spacing dimension W1 along the second direction between the boundary of the connecting weld mark 400 close to the air-avoiding chamber 300 and the side wall of the air-avoiding chamber 300 close to the connecting weld mark 400, so as to satisfy W1≥3mm, the air-avoiding chamber 300 can be prevented from being too close to the weld mark 400, resulting in excessively high temperature in the air-avoiding chamber 300, which cannot provide a good insulation effect between the first insulating member 1 and the pole ear 100.

[0044] In this embodiment, if Figure 1 As shown, the battery cover also includes a cover body 3, a second insulating member 4 and a connecting block 5. A connecting through hole corresponding to the plug-in through hole 11 is provided on the cover body 3, and one end of the pole body 21 passes through the plug-in through hole 11 and is inserted in the connecting through hole to be connected to the connecting block 5. The second insulating member 4 is arranged on the side of the cover body 3 away from the first insulating member 1, and is used to achieve insulation protection among the cover body 3, the pole body 21 and the connecting block 5. In addition, in order to ensure the firmness of the connection between the first insulating member 1 and the cover body 3, the first insulating member 1 is provided with a positioning protrusion on the outside of the plug-in through hole 11, 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.

[0045] The battery cover can be a welded cover or a riveted cover. When the battery cover is a welded cover, the connecting block 5 is welded to the pole body 21. When the battery cover is a riveted cover, the connecting block 5 is riveted to the pole body 21. The battery cover of this structure can be adapted to different types of batteries by changing the number of conductive electrode columns 2. When a conductive electrode column 2 is provided on the battery cover, the battery cover is adapted to blade batteries. When two conductive electrode columns 2 are provided on the battery cover, the battery cover is adapted to square shell batteries.

[0046] Optionally, the width dimension of the second groove 122 in the second direction is W2, and 11 mm ≤ W1 + W2 ≤ 14 mm is satisfied. By defining the width dimension W2 of the second groove 122 in the second direction to satisfy 11 mm ≤ W1 + W2 ≤ 14 mm, on the premise that the spacing dimension W1 between the boundary of the connection welding mark 400 close to the avoidance cavity 300 and the side wall of the avoidance cavity 300 close to the connection welding mark 400 in the second direction meets the requirements, on the one hand, it is avoided that the space of the avoidance cavity 300 in the second direction is too small to effectively insulate the first insulating part 1 and the tab 100, and on the other hand, it is avoided that the space of the avoidance cavity 300 is too large, weakening the structural strength of the first insulating part 1, increasing the suspended area of the tab 100, resulting in poor stability of the tab 100 during welding, prone to poor welding, and reducing the welding quality.

[0047] Optionally, a heat insulation gap 200 is formed between the part of the tab 100 passing over the second groove 122 and the surface of the first insulating part 1 facing the tab 100. The length dimension of the heat insulation gap 200 in the first direction is H1, and 0.2 mm ≤ H1 ≤ 0.5 mm is satisfied. By defining the length dimension H1 of the heat insulation gap 200 in the first direction to satisfy 0.2 mm ≤ H1 ≤ 0.5 mm, on the one hand, it is avoided that the distance between the tab 100 and the area of the first insulating part 1 where the accommodating structure 12 is not provided is too close, resulting in poor heat insulation effect and increasing the thermal influence on the first insulating part 1 when the tab 100 is welded to the tab bottom plate 22, and on the other hand, it is avoided that the distance between the tab 100 and the area of the first insulating part 1 where the accommodating structure 12 is not provided is too far, increasing the space occupied in the height direction, resulting in a reduction in the volume of the electrode group and a decrease in the power supply capacity.

[0048] Optionally, the length dimension of the avoidance cavity 300 in the first direction is H2, and 0.3 mm ≤ H2 - H1 ≤ 0.6 mm is satisfied. By defining the length dimension H2 of the avoidance cavity 300 in the first direction to satisfy 0.3 mm ≤ H2 - H1 ≤ 0.6 mm, on the premise that the length dimension H1 of the heat insulation gap 200 in the first direction meets the requirements, on the one hand, it is avoided that the space of the avoidance cavity 300 in the first direction is too small to effectively insulate the first insulating part 1 and the tab 100, and on the other hand, it is avoided that the space of the avoidance cavity 300 is too large, weakening the structural strength of the first insulating part 1, increasing the suspended area of the tab 100, resulting in poor stability of the tab 100 during welding, prone to poor welding, and reducing the welding quality.

[0049] Optionally, the pole bottom plate 22 includes a first connecting plate 221, a second connecting plate 222 and a fuse structure 223, the first connecting plate 221 is connected to the pole body 21, the second connecting plate 222 is welded to the pole ear 100 on the side away from the first insulating member 1, and the fuse structure 223 is arranged between the first connecting plate 221 and the second connecting plate 222. The pole bottom plate 22 is formed by the first connecting plate 221, the second connecting plate 222 and the fuse structure 223, so that when a short circuit occurs, the high temperature generated is used to melt the fuse structure 223, thereby realizing the disconnection of the pole body 21 connected to the first connecting plate 221 and the pole ear 100 connected to the second connecting plate 222, thereby improving the safety protection performance, and because the first connecting plate 221 and the second connecting plate 222 are connected by the fuse structure 223, the heat conduction capacity thereof is smaller than that of the pole bottom plate 22 formed of the integral metal plate, and the heat dissipation area is smaller and the heat conduction capacity is worse, so it is more necessary to form an air-avoiding chamber 300 by using the second groove 122 and the area of the pole ear 100 close to the welding mark 400, so that a large space is left between the position of the pole ear 100 close to the welding mark 400 and the first insulating member 1, thereby reducing the thermal influence of the pole ear 100 and the pole bottom plate 22 on the first insulating member 1 during welding, and avoiding the first insulating member 1 from being deformed by heat to a great extent, thereby improving the insulation protection and assembly processability of the battery cover.

[0050] In this embodiment, the conductive electrode column 2 provided with the fuse structure 223 is generally the positive electrode column. Since the negative electrode ear is generally made of copper, the negative electrode column connected to the negative electrode ear is generally also made of copper. The thermal conductivity of copper is higher, so there is no need to set the fuse structure 223 on the negative electrode column, avoiding waste of resources and reducing manufacturing costs. In order to prevent the fuse structure 223 from melting when welding the electrode ear 100 and the electrode bottom plate 22, the melting point of the fuse structure 223 is greater than the temperature when the electrode ear 100 and the electrode bottom plate 22 are welded, and not greater than the temperature when a short circuit occurs.

[0051] In order to verify the relationship between the spacing dimension W1 along the second direction between the boundary of the connection weld mark 400 close to the air-avoiding chamber 300 and the side wall of the air-avoiding chamber 300 close to the connection weld mark 400 and the width dimension W2 of the air-avoiding chamber 300 along the second direction, and the relationship between the length dimension H1 of the heat-insulating gap 200 along the first direction and the length dimension H2 of the air-avoiding chamber 300 along the first direction, six groups of embodiments and four groups of comparative examples are provided as shown in Table 1 for verification. Among them, the conductive electrode column 2 is a positive electrode column welded with the positive electrode ear, and the electrode column bottom plate 22 of the conductive electrode column 2 is provided with a fuse structure 223. The material of the first insulating member 1 abutting against the electrode column bottom plate 22 is the industry-general material PP (melting point temperature 160°C to 170°C). The power of welding the electrode ear 100 and the electrode column bottom plate 22 is 1000W.

[0052] Table 1

[0053]

[0054] As can be seen from Examples 1 to 6 in Table 1, when the distance dimension W1 in the second direction between the connecting weld mark 400 close to the boundary of the avoidance cavity 300 and the side wall of the avoidance cavity 300 close to the connecting weld mark 400 and the width dimension W2 of the avoidance cavity 300 in the second direction satisfy 11 mm ≤ W1 + W2 ≤ 14 mm, at this time, the space of the avoidance cavity 300 in the second direction is sufficient, which can effectively insulate between the first insulating member 1 and the tab 100, and the first insulating member 1 has sufficient structural strength to support the pole column bottom plate 22 for welding operation, ensuring the stability during welding. When the relationship between the length dimension H1 of the heat insulation gap 200 in the first direction and the length dimension H2 of the avoidance cavity 300 in the first direction satisfies 0.3 mm ≤ H2 - H1 ≤ 0.6 mm, at this time, the space of the avoidance cavity 300 in the first direction is sufficient, which can effectively insulate between the first insulating member 1 and the tab 100, and the first insulating member 1 has sufficient structural strength to support the pole column bottom plate 22 for welding operation, ensuring the stability during welding. Therefore, after welding the tab 100 and the pole column bottom plate 22, no thermal melting marks or poor welding conditions are found on the first insulating member 1.

[0055] As can be seen from Comparative Example 1 in Table 1, when the relationship between the length dimension H1 of the heat insulation gap 200 in the first direction and the length dimension H2 of the avoidance cavity 300 in the first direction is less than the minimum value of 0.3 mm ≤ H2 - H1 ≤ 0.6 mm, at this time, the space of the avoidance cavity 300 in the first direction is too small to effectively insulate between the first insulating member 1 and the tab 100, resulting in the first insulating member 1 being scalded and thermal melting marks appearing.

[0056] As can be seen from Comparative Example 2 in Table 1, when the relationship between the length dimension H1 of the heat insulation gap 200 in the first direction and the length dimension H2 of the avoidance cavity 300 in the first direction is greater than the maximum value of 0.3 mm ≤ H2 - H1 ≤ 0.6 mm, at this time, the space of the avoidance cavity 300 in the first direction is too large, which not only causes the structural strength of the first insulating member 1 to be too low, but also the depth of the suspended area of the tab 100 is too large, resulting in poor stability of the tab 100 during welding and poor welding conditions.

[0057] As can be seen from Comparative Example 3 in Table 1, when the distance dimension W1 in the second direction between the boundary where the connection weld mark 400 is close to the avoidance cavity 300 and the side wall of the avoidance cavity 300 close to the connection weld mark 400 is less than the minimum value of 11mm ≤ W1 + W2 ≤ 14mm compared with the width dimension W2 of the avoidance cavity 300 in the second direction, the space of the avoidance cavity 300 in the second direction is too small at this time to effectively insulate the first insulating member 1 from the tab 100, resulting in the first insulating member 1 being scalded and showing a hot melt mark.

[0058] As can be seen from Comparative Example 4 in Table 1, when the distance dimension W1 in the second direction between the boundary where the connection weld mark 400 is close to the avoidance cavity 300 and the side wall of the avoidance cavity 300 close to the connection weld mark 400 is greater than the maximum value of 11mm ≤ W1 + W2 ≤ 14mm compared with the width dimension W2 of the avoidance cavity 300 in the second direction, the space of the avoidance cavity 300 in the second direction is too large at this time, which not only results in too low structural strength of the first insulating member 1, but also the area where the tab 100 is suspended is too wide, making the stability of the tab 100 poor during welding and resulting in poor welding.

[0059] Optionally, a blocking through groove 224 is formed in the fusing structure 223. By forming the blocking through groove 224 in the fusing structure 223, the cross-sectional area of the fusing structure 223 is reduced, so that in the event of a short circuit, due to the smaller cross-section, the heat generation is accelerated, and thus early fusing is achieved, and its protection performance is better. However, since the cross-sectional area of the fusing structure 223 is smaller after the blocking through groove 224 is formed, it is more necessary to use the second groove 122 and the area of the tab 100 close to the weld mark 400 to form the avoidance cavity 300, so that there is a large space between the position of the tab 100 close to the weld mark 400 and the first insulating member 1, thereby reducing the thermal influence of the tab 100 and the pole column base plate 22 on the first insulating member 1 during welding, and largely avoiding the heat deformation of the first insulating member 1, thereby improving the insulation protection performance and assembly processability of the battery cover plate.

[0060] Optionally, the conductive pole column 2 further includes an insulating rubber sleeve 23, and the insulating rubber sleeve 23 is sleeved outside the fusing structure 223. By arranging the insulating rubber sleeve 23 outside the fusing structure 223, on the one hand, it provides insulation protection to avoid arcing due to too small a gap between the first connecting plate 221 and the second connecting plate 222, and on the other hand, in the event of a short circuit, since the insulating rubber sleeve 23 is arranged outside the fusing structure 223, it can prevent the residue after the fusing structure 223 melts from falling into the battery and causing damage.

[0061] Optionally, a plurality of limiting protrusions 123 that are in contact with the first connecting plate 221 and the second connecting plate 222 are symmetrically distributed on two opposite wall surfaces of the first groove 121 along the third direction and opposite to the pole bottom plate 22. By providing the limiting protrusions 123 that are in contact with the pole bottom plate 22 on the second wall surface, the position of the pole bottom plate 22 can be limited and fixed, so as to avoid the problem of poor welding caused by the dislocation of the pole bottom plate 22 when the pole bottom plate 22 is welded to the pole ear 100.

[0062] In this embodiment, since the pole bottom plate 22 includes the first connecting plate 221 and the second connecting plate 222, it is necessary to provide the limiting protrusions 123 that are respectively in contact with the first connecting plate 221 and the second connecting plate 222 on the second wall surface to ensure the firmness of the fixation with the pole bottom plate 22. The number of the limiting protrusions 123 provided on a single second wall surface can be freely selected according to requirements. For example, in this embodiment, three limiting protrusions 123 are provided on each second wall surface to be in contact with the first connecting plate 221, and one limiting protrusion 123 is provided to be in contact with the second connecting plate 222.

[0063] Optionally, the number of the limiting protrusions 123 in contact with the first connecting plate 221 is greater than the number of the limiting protrusions 123 in contact with the second connecting plate 222. The reason why the number of the limiting protrusions 123 in contact with the first connecting plate 221 is greater than the number of the limiting protrusions 123 in contact with the second connecting plate 222 is that the temperature of the first connecting plate 221 is lower than that of the second connecting plate 222. Therefore, it is avoided that the limiting protrusions 123 are melted by heat, resulting in ineffective fixation of the pole bottom plate 22.

[0064] In this embodiment, a battery is further provided. The battery includes a pole group, a battery housing, and the above-mentioned battery cover plate. The battery housing is a cavity structure with an opening, and the battery cover plate is arranged at the opening of the battery housing to close the battery housing and form a receiving cavity for accommodating the pole group. By applying the above-mentioned battery cover plate, the battery not only reduces the probability of short circuit and the occurrence of poor welding, thereby improving 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.

[0065] Obviously, the above-mentioned embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments, and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. Battery cover plate, characterized in that, The battery cover plate includes: A first insulating member, on which an insertion through-hole and a receiving structure are provided. The receiving structure includes a first groove and a second groove. The first groove is provided on a side close to the insertion through-hole, and the depth of the first groove in a first direction is greater than the depth of the second groove in the first direction. A conductive electrode post, which includes a post body and a post bottom plate. The post body is inserted into the insertion through-hole, and the post bottom plate is connected to the post body. The post bottom plate is received in the first groove and protrudes from the first groove. One side of the post bottom plate facing away from the first insulating member is welded to a part of the tab, and a connection weld mark is formed. The other part of the tab extends beyond the post bottom plate in a second direction and crosses the second groove. The part of the tab opposite to the second groove and the second groove form an avoidance cavity. The distance dimension in the second direction between the boundary of the connection weld mark close to the avoidance cavity and the side wall of the avoidance cavity close to the connection weld mark is W1, and it satisfies W1≥3mm.

2. The battery cover plate according to claim 1, wherein, The width dimension of the avoidance cavity in the second direction is W2, and it satisfies 11mm≤W1+W2≤14mm.

3. The battery cover plate according to claim 1, characterized in that, A heat insulation gap is formed between the part of the tab that crosses the second groove and the surface of the first insulating member facing the tab. The length dimension of the heat insulation gap in the first direction is H1, and it satisfies 0.2mm≤H1≤0.5mm.

4. The battery cover plate according to claim 3, characterized in that, The length dimension of the avoidance cavity in the first direction is H2, and it satisfies 0.3mm≤H2-H1≤0.6mm.

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

6. The battery cover plate according to claim 5, characterized in that, A blocking through-groove is provided on the fusing structure.

7. The battery cover plate according to claim 5, wherein The conductive electrode post further includes an insulating rubber sleeve, which is sleeved outside the fusing structure.

8. The battery cover plate according to claim 5, characterized in that, A plurality of limiting protrusions that abut against the first connecting plate and the second connecting plate are symmetrically distributed on two walls of the first groove opposite to the post bottom plate in a third direction.

9. The battery cover plate according to claim 8, characterized in that, The number of the limiting protrusions abutting against the first connecting plate is greater than the number of the limiting protrusions abutting against the second connecting plate.

10. A battery, characterized in that, The battery includes a battery cell 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. The battery cover plate is provided at the opening of the battery housing to close the battery housing and form a cavity for receiving the battery cell group.

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