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 conductive pole comprises a pole main body and a pole bottom plate, one side of the pole bottom plate deviating from the first insulating part is welded with a tab, and the first insulating part is welded with the tab; a part which is formed after the tab is bent and is parallel to the pole bottom plate comprises a connecting part, a flow guide part and an avoiding groove, the connecting part is welded on the pole bottom plate, the flow guide part is propped against the first insulating part, the avoiding groove is formed between the flow guide part and the connecting part, the length size of the avoiding groove in the first direction is W, the total length size of the flow guide part and the avoiding groove in the first direction is H, and W / H is larger than or equal to 0.38 and smaller than or equal to 0.6. The area of heat transfer from the connecting part to the flow guide part is reduced through the avoiding groove, the overhigh-temperature area on the tab is reduced, the heat influence on the first insulating part during welding is reduced, and the insulation protection property 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] The explosion-proof valve is used to prevent the high-temperature and high-pressure gas inside the battery from breaking through the explosion-proof valve when thermal runaway occurs inside the battery, thereby achieving the purpose of pressure relief protection. The plastic parts are used to insulate the conductive electrode from the bare aluminum plate to prevent the electrode and the ear from directly contacting the bare aluminum plate and causing a short circuit. Therefore, the explosion-proof valve and insulating parts are important components to ensure the safety of battery use.

[0004] 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, after 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. Summary of the invention

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

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

[0007] In one aspect, a battery cover is provided, the battery cover comprising:

[0008] A first insulating member, wherein the first insulating member is provided with an inserting through hole;

[0009] A conductive electrode, the conductive electrode comprising a pole body and a pole bottom plate, the pole body being inserted into the plug-in through hole, the pole bottom plate being welded to a pole ear on a side away from the first insulating member, the portion of the pole ear that is bent and parallel to the pole bottom plate comprising a connecting portion, a guide portion and an avoidance groove, the connecting portion being at least partially welded to the pole bottom plate, the guide portion being in contact with the first insulating member, and the avoidance groove being arranged between the guide portion and the connecting portion;

[0010] The length dimension of the avoidance groove along the first direction is W, the total length dimension of the guide portion along the first direction and the avoidance groove is H, and 0.38≤W / H≤0.6 is satisfied.

[0011] Optionally, a length dimension W of the avoidance groove along the first direction satisfies 10 mm ≤ W ≤ 20 mm.

[0012] Optionally, a width dimension of the avoidance groove along the second direction is L1, a length dimension of a region where the guide portion and the first insulating member are in contact with each other along the second direction is L2, and 0.5≤L1 / L2≤1.1 is satisfied.

[0013] Optionally, a width dimension L1 of the avoidance groove along the second direction satisfies 8mm≤L1≤18mm.

[0014] Optionally, the pole bottom plate includes a first connecting plate, a second connecting plate and a fuse structure, the first connecting plate is connected to the pole body, the second connecting plate is welded to the pole ear on a side away from the first insulating member, and the fuse structure is arranged between the first connecting plate and the second connecting plate.

[0015] Optionally, a blocking groove is provided on the fuse structure.

[0016] Optionally, the conductive electrode column further includes an insulating rubber sleeve, and the insulating rubber sleeve is sleeved on the outside of the fuse structure.

[0017] Optionally, a receiving groove is further provided on the first insulating member, and the first connecting plate, the second connecting plate and the fuse structure are all accommodated in the receiving groove. A plurality of limiting protrusions abutting against the pole bottom plate are provided on two opposite wall surfaces of the receiving groove along the second 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, comprising a pole group, a battery shell and a battery cover as described in any one of the above items, wherein the battery shell is a cavity structure with an opening, and the battery cover is arranged at the opening of the battery shell to close the battery shell to form a cavity for accommodating the pole group.

[0020] Beneficial effects of the present invention:

[0021] The present invention provides a battery cover plate. By providing an avoidance groove between the connection part and the diversion part of the tab, not only does the avoidance groove reduce the heat transfer area from the connection part to the diversion part during welding, but also the area with excessive temperature on the tab is reduced. Thus, the thermal influence on the first insulating member during the welding of the tab and the connection part is reduced, avoiding the melting deformation of the first insulating member due to high temperature, improving the insulation protection performance and the assembly processability. By defining the length dimension W of the avoidance groove in the first direction and the total length dimension H of the diversion part and the avoidance groove in the first direction, such that 0.38 ≤ W / H ≤ 0.6, on the one hand, it avoids the length of the avoidance groove in the first direction being too small, resulting in an excessive area with a high temperature on the tab; on the other hand, it avoids the length of the avoidance groove in the first direction being too large, thus affecting the diversion area of the diversion part and resulting in the output efficiency not meeting the usage requirements.

[0022] The present invention also provides a battery. By applying the above-mentioned battery cover plate, the probability of short circuit is not only reduced, thereby improving the product quality, but also due to the improvement of the assembly processability, the assembly speed is greatly increased, the assembly cycle is shortened, and the production capacity is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic diagram of the welding of the battery cover plate provided by the present invention and the tab;

[0024] Figure 2 is a bottom plan view after the welding of the battery cover plate provided by the present invention and the tab;

[0025] Figure 3 is a side view after the welding of the battery cover plate provided by the present invention and the tab;

[0026] Figure 4 is a schematic diagram of the structure of the tab in the battery cover plate provided by the present invention;

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

[0028] Figure 6 is an assembly drawing of the conducting electrode post in the battery cover plate provided by the present invention;

[0029] Figure 7 is a schematic diagram of the structure of the conducting electrode post in the battery cover plate provided by the present invention without the insulating rubber sleeve assembled.

[0030] In the figure:

[0031] 100, tab; 101, connection part; 102, diversion part; 103, avoidance groove;

[0032] 1. First insulating part; 11. Insertion through-hole; 12. Accommodating groove; 13. Limiting protrusion;

[0033] 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-slot; 23. Insulating rubber sleeve;

[0034] 3. Cover plate body;

[0035] 4. Second insulating part;

[0036] 5. Connecting block. Specific embodiments

[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. In addition, 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", 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 therebetween. 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 merely 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 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 "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and do not have special meanings.

[0041] 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.

[0042] 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.

[0043] like Figures 1 to 7 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, 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, and the pole bottom plate 22 is welded to the pole ear 100 on the side away from the first insulating member 1, and the portion of the pole ear 100 that is parallel to the pole bottom plate 22 after bending includes a connecting portion 101, a guide portion 102 and an avoidance groove 103, the connecting portion 101 is at least partially welded to the pole bottom plate 22, the guide portion 102 abuts against the first insulating member 1, and the avoidance groove 103 is provided between the guide portion 102 and the connecting portion 101, the length dimension of the avoidance groove 103 along the first direction is W, and the total length dimension of the guide portion 102 and the avoidance groove 103 along the first direction is H, and 0.38≤W / H≤0.6 is satisfied.

[0044] The battery cover plate is provided with an avoidance groove 103 between the connecting portion 101 and the guide portion 102 of the pole lug 100. The avoidance groove 103 not only reduces the area of heat transfer from the connecting portion 101 to the guide portion 102 during welding, but also reduces the area on the pole lug 100 where the temperature is too high, thereby reducing the thermal impact on the first insulating member 1 when the pole lug 100 and the connecting portion 101 are welded, avoiding the first insulating member 1 from being deformed by thermal melting due to high temperature, improving the insulation protection and assembly processability, and limiting the length dimension W of the avoidance groove 103 along the first direction and the total length dimension H of the guide portion 102 and the avoidance groove 103 along the first direction so that both satisfy 0.38≤W / H≤0.6, thereby avoiding, on the one hand, the length of the avoidance groove 103 along the first direction being too small, resulting in an excessively large area on the pole lug 100 with a higher temperature, and on the other hand, avoiding the length of the avoidance groove 103 along the first direction being too large, thereby affecting the guide area of the guide portion 102, resulting in the output efficiency not meeting the use requirements.

[0045] In this embodiment, if Figure 1As shown, the battery cover plate further includes a cover plate body 3, a second insulating member 4, and a connecting block 5. A connecting through hole corresponding to the insertion through hole 11 is provided on the cover plate body 3. One end of the pole column body 21 passing through the insertion through hole 11 is inserted into the connecting through hole and connected to the connecting block 5. The second insulating member 4 is arranged on the side of the cover plate body 3 facing away from the first insulating member 1 and is used to achieve insulation protection among the cover plate body 3, the pole column body 21, and the connecting block 5. In addition, in order to ensure the firmness when the first insulating member 1 is connected to the cover plate body 3, the first insulating member 1 is provided with a positioning protrusion outside the insertion through hole 11, and a positioning through hole adapted to the positioning protrusion is provided on the cover plate body 3. The positioning protrusion is inserted into the positioning through hole.

[0046] 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 5 is welded to the pole column body 21. When the battery cover plate is a riveted cover plate, the connecting block 5 is riveted to the pole column body 21. And the battery cover plate of this structure can adapt to different types of batteries by changing the number of the conductive pole columns 2. When there is one conductive pole column 2 on the battery cover plate, the battery cover plate is adapted to a blade battery. When there are two conductive pole columns 2 on the battery cover plate, the battery cover plate is adapted to a square shell battery.

[0047] Optionally, the length dimension W of the avoidance groove 103 in the first direction satisfies 10mm ≤ W ≤ 20mm. By limiting the length dimension W of the avoidance groove 103 in the first direction to satisfy 10mm ≤ W ≤ 20mm, on the one hand, it is avoided that the length of the avoidance groove 103 in the first direction is too small, resulting in still existing high-temperature areas on the diversion part 102, so that the first insulating member 1 in direct contact with the diversion part 102 is burned by the high-temperature areas. On the other hand, it is avoided that the length of the avoidance groove 103 in the first direction is too large, resulting in too small an area of the diversion part 102 and reducing the over-current capacity.

[0048] Optionally, the width dimension of the avoidance groove 103 in the second direction is L1, and the length dimension of the area where the diversion part 102 is attached to the first insulating member 1 in the second direction is L2, and 0.5 ≤ L1 / L2 ≤ 1.1 is satisfied. By limiting the ratio between the width dimension L1 of the avoidance groove 103 in the second direction and the width dimension L2 of the diversion part 102 in the second direction to satisfy 0.5 ≤ L1 / L2 ≤ 1.1, on the one hand, it is avoided that the width of the diversion part 102 in the second direction is too small, resulting in a relatively large remaining area for the connection part 101 to transfer heat to the diversion part 102, leading to too high a temperature of the diversion part 102, so that the first insulating member 1 in direct contact with the diversion part 102 still deforms at high temperatures. On the other hand, it is avoided that the width of the diversion part 102 in the second direction is too large, thus affecting the diversion area of the diversion part 102 and resulting in the output efficiency not meeting the usage requirements.

[0049] Optionally, the width dimension L1 of the avoidance groove 103 in the second direction satisfies 8 mm ≤ L1 ≤ 18 mm. By defining the width dimension L1 of the avoidance groove 103 in the second direction to satisfy 8 mm ≤ L1 ≤ 18 mm, on the one hand, it is possible to avoid a relatively small width of the avoidance groove 103 in the second direction, resulting in a relatively large remaining area for heat transfer from the connecting portion 101 to the diversion portion 102, causing the temperature of the diversion portion 102 to be too high, so that the first insulating member 1 in direct contact with the diversion portion 102 still deforms at high temperatures. On the other hand, it is possible to avoid a relatively large width of the avoidance groove 103 in the second direction, resulting in a too small area where the diversion portion 102 is connected to the connecting portion 101, thereby reducing the current-carrying area between the diversion portion 102 and the connecting portion 101 and weakening the current-carrying capacity.

[0050] Optionally, the pole post base plate 22 includes a first connecting plate 221, a second connecting plate 222, and a fusing structure 223. The first connecting plate 221 is connected to the pole post body 21, the second connecting plate 222 is welded to the pole ear 100 on the side facing away from the first insulating member 1, and the fusing structure 223 is provided between the first connecting plate 221 and the second connecting plate 222.

[0051] The pole post base plate 22 is formed by the first connecting plate 221, the second connecting plate 222, and the fusing structure 223. When a short circuit occurs, the fusing structure 223 is melted by the generated high temperature, so that the pole post body 21 connected to the first connecting plate 221 is disconnected from 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 fusing structure 223, its heat conduction capacity has a smaller heat dissipation area and a worse heat conduction capacity compared with the pole post base plate 22 formed by an integral metal plate. Therefore, an avoidance groove 103 is provided in the pole ear 100 to reduce the thermal influence on the first insulating member 1 during the welding operation, and to avoid deformation of the first insulating member 1 due to the too high temperature of the pole ear 100, improving the insulation performance and the assembly processability.

[0052] In this embodiment, the conductive pole post 2 provided with the fusing structure 223 is generally the positive pole post. Because the negative pole ear is generally made of copper, the negative pole post 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 223 on the negative pole post to avoid waste of resources and reduce the manufacturing cost. In order to avoid melting of the fusing structure 223 during the welding of the pole ear 100 and the pole post base plate 22, the melting point of the fusing structure 223 is greater than the temperature during the welding of the pole ear 100 and the pole post base plate 22 and not greater than the temperature during a short circuit.

[0053] Among them, in order to verify the relationship between the length dimension W of the avoidance groove 103 in the first direction and the total length dimension H of the diversion part 102 in the first direction, as well as the relationship between the width dimension L1 of the avoidance groove 103 in the second direction and the length dimension L2 of the area where the diversion part 102 is attached to the first insulating part 1 in the second direction, and the influence on the thermal influence and diversion ability of the first insulating part 1, as shown in Table 1, six groups of embodiments and four groups of comparative examples are provided for verification. Among them, the conductive electrode post 2 is the positive electrode post welded to the positive electrode tab. A fusing structure 223 is provided on the electrode post bottom plate 22 of the conductive electrode post 2. The material of the first insulating part 1 in contact with the electrode post bottom plate 22 is the industry - common material PP (melting point temperature 160°C - 170°C), and the welding power of the electrode tab 100 to the electrode post bottom plate 22 is 1000W.

[0054] Table 1

[0055]

[0056] As can be seen from Embodiments 1 to 6 in Table 1, when the relationship between the length dimension W of the avoidance groove 103 in the first direction and the total length dimension H of the diversion part 102 in the first direction satisfies the range of 0.38 ≤ W / H ≤ 0.6, at this time, the length of the avoidance groove 103 in the first direction eliminates the high - temperature area on the diversion part 102, and the diversion ability of the electrode tab 100 within this dimension range meets the power supply requirements, and the output power is qualified. When the relationship between the width dimension L1 of the avoidance groove 103 in the second direction and the length dimension L2 of the area where the diversion part 102 is attached to the first insulating part 1 in the second direction satisfies the range requirement of 0.5 ≤ L1 / L2 ≤ 1.1, at this time, the width of the avoidance groove 103 in the second direction effectively reduces the area when the connecting part 101 transfers heat to the diversion part 102, avoids the over - high temperature of the diversion part 102, reduces the thermal influence on the first insulating part 1, and the diversion ability of the electrode tab 100 within this dimension range meets the power supply requirements, and the output power is qualified.

[0057] As can be seen from Comparative Example 1 in Table 1, when the relationship between the length dimension W of the avoidance groove 103 in the first direction and the total length dimension H of the diversion part 102 in the first direction is less than the minimum value of 0.38 ≤ W / H ≤ 0.6, at this time, the length of the avoidance groove 103 in the first direction is too small, resulting in the existence of a still - high - temperature area on the diversion part 102, causing the temperature of the first insulating part 1 to be too high and resulting in hot - melt deformation.

[0058] As can be seen from Comparative Example 2 in Table 1, when the relationship between the length dimension W of the avoidance groove 103 in the first direction and the total length dimension H of the diversion part 102 in the first direction is limited to be greater than the maximum value of 0.38 ≤ W / H ≤ 0.6, at this time, the length of the avoidance groove 103 in the first direction is too large, and the area for realizing current conduction on the diversion part 102 is too small, resulting in the output capacity not meeting the usage requirements and the output power being unqualified.

[0059] As can be seen from Comparative Example 3 in Table 1, when the relationship between the width dimension L1 of the avoidance groove 103 in the second direction and the length dimension L2 of the area where the diversion part 102 is in contact with the first insulating part 1 in the second direction is limited to be less than the minimum value of 0.5 ≤ L1 / L2 ≤ 1.1, at this time, the width of the diversion part 102 in the second direction is smaller, resulting in a relatively large remaining area for realizing heat transfer from the connecting part 101 to the diversion part 102, leading to too high a temperature of the diversion part 102, and causing the first insulating part 1 in direct contact with the diversion part 102 to still undergo hot melt deformation at high temperatures.

[0060] As can be seen from Comparative Example 4 in Table 1, when the relationship between the width dimension L1 of the avoidance groove 103 in the second direction and the length dimension L2 of the area where the diversion part 102 is in contact with the first insulating part 1 in the second direction is limited to be greater than the maximum value of 0.5 ≤ L1 / L2 ≤ 1.1, the width of the diversion part 102 in the second direction is too large, and the area for realizing current conduction on the diversion part 102 is too small, resulting in the output capacity not meeting the usage requirements and the output power being unqualified.

[0061] Optionally, a blocking through groove 224 is provided on the fusing structure 223. By providing the blocking through groove 224 on 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, thereby achieving early fusing, 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 provided, it is more necessary to use the method of providing the avoidance groove 103 to reduce the heat transferred to the diversion part 102 during welding, thereby reducing the thermal influence of the high temperature generated during the welding of the second connecting plate 222 and the connecting part 101 on the first insulating part 1.

[0062] Optionally, the conductive electrode post 2 further includes an insulating rubber sleeve 23, and the insulating rubber sleeve 23 is sleeved outside the fusing structure 223. By providing the insulating rubber sleeve 23 outside the fusing structure 223, on the one hand, it provides insulation protection to avoid the occurrence of 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 provided outside the fusing structure 223, it avoids the residues after the fusing structure 223 melts from falling into the battery interior and causing damage.

[0063] Optionally, a receiving groove 12 is further formed in the first insulating member 1. The first connecting plate 221, the second connecting plate 222, and the fusing structure 223 are all received in the receiving groove 12. A plurality of limiting protrusions 13 abutting against the pole bottom plate 22 are provided on two opposite wall surfaces of the receiving groove 12 along the second direction.

[0064] By forming the receiving groove 12 in the first insulating member 1, the pole bottom plate 22 is received in the receiving groove 12, so that there is an overlapping part between the pole bottom plate 22 and the first insulating member 1 in space, making the structure more compact, reducing the overall thickness dimension of the battery cover plate, reducing the occupied space, thereby increasing the volume of the pole group and improving the power supply capacity. And by providing the limiting protrusions 13 abutting against the pole bottom plate 22 on two opposite wall surfaces of the receiving groove 12 along the second direction, the position of the pole bottom plate 22 is limited and fixed, avoiding the problem of poor welding caused by the dislocation of the pole bottom plate 22 during the welding of the pole bottom plate 22 and the pole ear 100.

[0065] 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 13 abutting against the first connecting plate 221 and the second connecting plate 222 respectively on the second wall surface to ensure the firmness of the fixation with the pole bottom plate 22. The number of the limiting protrusions 13 provided on a single second wall surface can be freely selected according to requirements. For example, in this embodiment, three limiting protrusions 13 are provided on each second wall surface to abut against the first connecting plate 221, and one limiting protrusion 13 is provided to abut against the second connecting plate 222.

[0066] Optionally, the number of the limiting protrusions 13 abutting against the first connecting plate 221 is greater than the number of the limiting protrusions 13 abutting against the second connecting plate 222. The reason why the number of the limiting protrusions 13 abutting against the first connecting plate 221 is greater than the number of the limiting protrusions 13 abutting against 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 13 are melted by heat, resulting in ineffective fixation of the pole bottom plate 22.

[0067] 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. The battery cover plate is provided at the opening of the battery housing to close the battery housing and form a receiving cavity for receiving 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 improves the production capacity due to the improvement of the assembly processability.

[0068] Obviously, the above-mentioned 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 within the protection scope of the claims of the present invention.

Claims

1. Battery cover plate, characterized in that, The battery cover comprises: A first insulating member, wherein the first insulating member is provided with an inserting through hole; A conductive electrode, the conductive electrode comprising a pole body and a pole bottom plate, the pole body being inserted into the plug-in through hole, the pole bottom plate being welded to a pole ear on a side away from the first insulating member, the portion of the pole ear that is bent and parallel to the pole bottom plate comprising a connecting portion, a guide portion and an avoidance groove, the connecting portion being at least partially welded to the pole bottom plate, the guide portion being in contact with the first insulating member, and the avoidance groove being arranged between the guide portion and the connecting portion; The length dimension of the avoidance groove along the first direction is W, the total length dimension of the guide portion and the avoidance groove along the first direction is H, and 0.38≤W / H≤0.6 is satisfied.

2. The battery cover plate according to claim 1, wherein, A length dimension W of the avoidance groove along the first direction satisfies 10 mm ≤ W ≤ 20 mm.

3. The battery cover plate according to claim 1, characterized in that, The width dimension of the avoidance groove along the second direction is L1, the length dimension of the area where the guide portion and the first insulating member are in contact with each other along the second direction is L2, and 0.5≤L1 / L2≤1.1 is satisfied.

4. The battery cover plate according to claim 3, characterized in that, A width dimension L1 of the avoidance groove along the second direction satisfies 8mm≤L1≤18mm.

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

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

7. The battery cover plate according to claim 5, 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.

8. The battery cover plate according to claim 5, wherein, The first insulating member is also provided with a receiving groove, in which the first connecting plate, the second connecting plate and the fuse structure are all accommodated. The receiving groove has two opposite walls along the second direction provided with a plurality of limiting protrusions abutting against the pole bottom plate.

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 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 cavity for accommodating the pole group.

Images