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 an insulating part, a cover plate body, a welding table and a pole, the insulating part comprises a first insulating part, a second insulating part and a plurality of fixing parts, the first insulating part is provided with a first groove and a plug-in groove, the second insulating part is provided with a second groove, and the first groove and the plug-in groove are communicated with each other. The cover plate body is provided with a fixing hole in plug-in connection with the fixing part and is arranged between the first insulating part and the second insulating part, the welding table is arranged in the first groove and is provided with a plug-in protrusion in plug-in connection with the plug-in groove, the pole column comprises a column body part welded to the welding table and a connecting part arranged in the second groove, the depth dimension of the plug-in groove in the first direction is A, and the depth dimension of the plug-in groove in the second direction is B; the thickness size of the side wall of the first groove in the first direction is T, and T-A is larger than or equal to 0.6 mm and smaller than or equal to 2.5 mm. The structure is simplified, the working procedures are reduced, the size is reduced, the space utilization rate is improved, the connection strength is high, and meanwhile the good insulation protection performance is achieved.

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] Lithium-ion batteries are currently widely used in various fields such as transportation power sources, power energy storage power sources, new energy storage power sources, and aerospace and military industries due to their advantages of large capacity, high working voltage, strong charge retention ability, and long cycle life. The structure of a single lithium battery generally includes a pole group, electrolyte, battery cover plate, housing, etc. Among them, the battery cover plate and the housing are usually fixed by laser welding to form a sealed space with a certain structural strength to protect the pole group. For traditional battery cover plates, they have many components including pole columns, welding platforms, light aluminum plates, internal insulation structures, and external insulation structures.

[0003] Therefore, for traditional battery cover plates, due to the large number of their components, multiple positionings are required during the assembly of each component to ensure the accuracy of the position after assembly, resulting in a very complicated assembly process. Moreover, in traditional battery cover plates, the internal insulation structure parts need to maintain a certain thickness dimension to ensure their certain strength and avoid deformation due to too small dimensions during assembly and welding. Therefore, the internal insulation structure parts occupy a large space, thus reducing the space available for the pole group and limiting the improvement of energy density. Summary of the Invention

[0004] The purpose of the present invention is to provide a battery cover plate and a battery, which have a simple structure, few assembly processes, save space, and have a high energy density.

[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] An insulating member, the insulating member includes a first insulating portion, a second insulating portion, and a plurality of fixing portions provided between the first insulating portion and the second insulating portion. A first groove is formed on the first insulating portion, and a plugging groove is provided on the side wall of the first groove. A second groove is formed on the second insulating portion;

[0008] A cover plate body, fixing holes corresponding to the fixing portions one by one are formed on the cover plate body. The cover plate body is provided between the first insulating portion and the second insulating portion, and the fixing portions are inserted into the corresponding fixing holes;

[0009] A welding platform, a plugging protrusion is provided on the side of the welding platform facing the cover plate body. The welding platform is provided in the first groove, and the plugging protrusion is inserted into the plugging groove;

[0010] A pole, the pole comprising a column part and a connecting part connected to the column part, the connecting part is arranged in the second groove, the column part sequentially passes through the second insulating part, the cover plate body, the first insulating part and is welded to the welding platform;

[0011] The depth dimension of the plug-in slot along the first direction is A, the thickness dimension of the side wall of the first groove along the first direction is T, and 0.6 mm≤TA≤2.5 mm is satisfied.

[0012] Optionally, a depth dimension A of the plug-in slot along the first direction satisfies 0.5 mm ≤ A ≤ 3 mm.

[0013] Optionally, a thickness dimension of the first insulating portion compressed between the welding platform and the cover plate body along the second direction is B, and satisfies 0.6 mm ≤ B ≤ 1.5 mm.

[0014] Optionally, a distance dimension C between a surface of the plug-in slot along the second direction away from the cover body and a surface of the first insulating portion along the second direction away from the cover body is satisfied, and 1.5 mm ≤ C ≤ 3 mm.

[0015] Optionally, the battery cover also includes an explosion-proof valve, and the cover body is also provided with a boss protruding in a direction away from the pole group, and a mounting hole passing through the boss, the explosion-proof valve is embedded in the mounting hole and is spaced apart from the surface of the cover body facing the pole group.

[0016] Optionally, the battery cover plate also includes a fixing ring, the mounting hole includes a first hole segment and a second hole segment, the aperture of the first hole segment is smaller than the aperture of the second hole segment, so as to form a step surface between the first hole segment and the second hole segment, the explosion-proof valve is arranged in the second hole segment and abuts against the step surface, the fixing ring is arranged in the second hole segment and is located on the side of the explosion-proof valve facing the pole group, and the fixing ring is welded to the cover plate body.

[0017] Optionally, the battery cover plate further includes a sealing ring, which is sleeved on the outer side of the explosion-proof valve and abuts against the inner wall of the mounting hole.

[0018] Optionally, the battery cover further comprises a protective sheet, which is arranged on a side of the boss away from the electrode group and is used to close the mounting hole.

[0019] Optionally, the battery cover further comprises an insulating sheet, which is attached to a side of the cover body facing the electrode group and is provided with an exhaust hole corresponding to the explosion-proof valve and an escape hole for evacuating the second insulating portion.

[0020] 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 hollow housing structure with an opening, and the battery cover plate is covered on the opening of the battery housing and closes the battery housing to form a receiving cavity for receiving the pole group.

[0021] Advantages of the present invention:

[0022] The present invention provides a battery cover plate. By arranging the cover plate body between the first insulating part and the second insulating part, inserting the fixing hole into the fixing part, arranging the soldering station in the first groove, and inserting the inserting protrusion into the inserting groove, while achieving insulation protection on both sides of the cover plate body, the connection strength between the cover plate body and the insulating part and between the insulating part and the soldering station is ensured. This enables the elimination of the need to separately set internal and external insulation structures, thereby reducing the number of components, simplifying the structure, reducing the assembly process, and by arranging the soldering station in the first groove of the first insulating part and the connecting part of the pole column in the second groove of the second insulating part, there is an overlapping area in space between the pole column and the soldering station with the insulating part, making the structure more compact, reducing the occupied space, so as to increase the volume of the pole group and improve the energy density. In addition, by limiting the difference between the thickness dimension T of the side wall of the first groove in the first direction and the depth dimension A of the inserting groove in the first direction, it is ensured that there is still enough thickness of the material in the area where the inserting groove is opened in the first insulating part to avoid being penetrated by current, thereby making it have good insulation protection.

[0023] The present invention also provides a battery. By applying the above battery cover plate, on the one hand, due to the reduction in the number of components, the manufacturing cost is reduced, and on the other hand, due to the reduction in the assembly process, the assembly operation efficiency is greatly improved, and the production capacity is increased. Description of the Drawings

[0024] Figure 1 is the structural exploded view of the battery cover plate provided by the present invention;

[0025] Figure 2 is the partial structural cross-sectional view of the area with a pole column in the battery cover plate provided by the present invention;

[0026] Figure 3 is Figure 2 the enlarged structural view of part Ⅰ in

[0027] Figure 4 is the partial structural cross-sectional view of the area with an explosion-proof valve in the battery cover plate provided by the present invention;

[0028] Figure 5 is the structural schematic diagram of the insulating part in the battery cover plate provided by the present invention;

[0029] Figure 6 It is a structural sectional view of the insulating part in the battery cover plate provided by the present invention.

[0030] In the figure:

[0031] 1. Insulating part; 11. First insulating part; 111. First groove; 112. Insertion slot; 113. Second through hole; 12. Second insulating part; 121. Second groove; 122. Third through hole; 13. Fixing part;

[0032] 2. Cover plate body; 21. Fixing hole; 22. First through hole; 23. Boss; 24. Mounting hole; 241. First hole section; 242. Second hole section; 243. Step surface;

[0033] 3. Solder pad; 31. Insertion protrusion; 32. Fourth through hole;

[0034] 4. Terminal post; 41. Column body part; 42. Connection part;

[0035] 5. Explosion-proof valve;

[0036] 6. Fixed ring;

[0037] 7. Sealing ring;

[0038] 8. Protective sheet. Detailed implementation manners

[0039] 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 only the parts related to the present invention rather than all the structures are shown in the drawings for the convenience of description.

[0040] 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.

[0041] In the present invention, unless otherwise clearly specified or limited, the first feature being "on" or "under" 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 additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely means that the horizontal height of the first feature is lower than that of the second feature.

[0042] In the description of this embodiment, the orientation or positional relationships such as "up", "down", "right", etc. are based on the orientation or positional relationship shown in the drawings. It is 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. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0043] Since the traditional battery cover plate not only has a relatively large number of components and a large volume, but also requires multiple positionings during assembly to ensure the assembly accuracy, which not only makes the assembly process extremely complicated, but also occupies a relatively large space, thus reducing the space available for the electrode group and limiting the improvement of the energy density.

[0044] Therefore, in order to simplify the structure, reduce the number of components, reduce the assembly process, reduce the volume, save the occupied space and improve the energy density, this embodiment provides a battery cover plate.

[0045] Such as Figures 1 to 6As shown in the figure, the battery cover plate includes an insulating member 1, a cover plate body 2, a soldering station 3, and a pole column 4. The insulating member 1 includes a first insulating portion 11, a second insulating portion 12, and a plurality of fixing portions 13 provided between the first insulating portion 11 and the second insulating portion 12. A first groove 111 is formed in the first insulating portion 11, and a plugging groove 112 is provided on the side wall of the first groove 111. A second groove 121 is formed in the second insulating portion 12. Fixing holes 21 corresponding to the fixing portions 13 one by one are formed in the cover plate body 2. The cover plate body 2 is arranged between the first insulating portion 11 and the second insulating portion 12, and the fixing portions 13 are inserted into the corresponding fixing holes 21. A plugging protrusion 31 is provided on the side of the soldering station 3 facing the cover plate body 2. The soldering station 3 is arranged in the first groove 111, and the plugging protrusion 31 is inserted into the plugging groove 112. The pole column 4 includes a column body portion 41 and a connecting portion 42 connected to the column body portion 41. The connecting portion 42 is arranged in the second groove 121. The column body portion 41 sequentially passes through the second insulating portion 12, the cover plate body 2, the first insulating portion 11 and is welded to the soldering station 3. The depth dimension of the plugging groove 112 in the first direction is A, and the thickness dimension of the side wall of the first groove 111 in the first direction is T, and 0.6mm ≤ T - A ≤ 2.5mm is satisfied.

[0046] By arranging the cover plate body 2 between the first insulating portion 11 and the second insulating portion 12, and inserting the fixing holes 21 and the fixing portions 13, and arranging the soldering station 3 in the first groove 111 and inserting the plugging protrusion 31 and the plugging groove 112, while achieving insulation protection on both sides of the cover plate body 2, the connection strength between the cover plate body 2 and the insulating member 1 and between the insulating member 1 and the soldering station 3 is ensured. It is not necessary to separately set internal and external insulation structures, thereby reducing the number of parts, making the structure simpler, reducing the assembly process. And by arranging the soldering station 3 in the first groove 111 of the first insulating portion 11 and arranging the connecting portion 42 of the pole column 4 in the second groove 121 of the second insulating portion 12, there is an overlapping area in space between the pole column 4 and the soldering station 3 with the insulating member 1, making the structure more compact, reducing the occupied space, so as to increase the volume of the electrode group and improve the energy density. In addition, by limiting the difference between the thickness dimension T of the side wall of the first groove 111 in the first direction and the depth dimension A of the plugging groove 112 in the first direction, it is ensured that the area of the first insulating portion 11 where the plugging groove 112 is formed can still retain enough thickness of the material to avoid being broken down by current, so that it has good insulation protection.

[0047] In this embodiment, the insulating member 1 is an injection molded part, which is directly injection molded on the cover body 2 through an injection molding process using the fixing holes 21 on the cover body 2, and a fixing portion 13 of the insulating member 1 is formed in the fixing holes 21. A first insulating portion 11 is formed on the side of the cover body 2 facing away from the electrode group, a second insulating portion 12 is formed on the side of the cover body 2 facing the electrode group, and a first groove 111 and a plugging groove 112 are formed on the first insulating portion 11 at the same time. A second groove 121 is formed on the second insulating portion 12. In order to ensure that the injection molded fixing portion 13 has a high structural strength, the aperture D of the fixing hole 21 is also limited in this embodiment, so that the aperture D of the fixing hole 21 satisfies the range of 2 mm ≤ D ≤ 5 mm. Since the column portion 41 of the pole column 4 needs to pass through the second insulating portion 12, the cover body 2, the first insulating portion 11 and the welding table 3 in sequence for welding, a first through hole 22 is also formed on the cover body 2. The fixing holes 21 are arranged in a ring shape outside the first through hole 22. A second through hole 113 is formed on the first insulating portion 11, a third through hole 122 is formed on the second insulating portion 12, and a fourth through hole 32 is formed on the welding table 3. The battery cover can be used in a variety of different types of batteries, such as blade batteries, square shell batteries and large cylindrical batteries. In this embodiment, the battery cover is used for a blade battery.

[0048] In addition, in this embodiment, the difference between the thickness dimension T of the side wall of the first groove 111 in the first direction and the depth dimension A of the plugging groove 112 in the first direction can be any value or the range between any two values between 0.6 mm and 2.5 mm, such as 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2.0 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, etc.

[0049] Optionally, as Figure 6 shown, the depth dimension A of the plugging groove 112 in the first direction satisfies 0.5 mm ≤ A ≤ 3 mm. By limiting the depth dimension A of the plugging groove 112 in the first direction to satisfy 0.5 mm ≤ A ≤ 3 mm, on the one hand, it is avoided that the depth of the plugging groove 112 is too deep, resulting in too thin a wall thickness of the side wall of the first insulating portion 11 and reducing its insulation performance. On the other hand, it is avoided that the depth of the plugging groove 112 is too shallow, resulting in a small contact area after being plugged with the plugging protrusion 31, so that the connection strength is low and the welding table 3 cannot be effectively limited, resulting in the welding table 3 being misaligned during the welding process and affecting the accuracy of the connection position.

[0050] In this embodiment, the depth dimension A of the insertion slot 112 in the first direction can be any value between 0.5 mm and 3 mm or the range between any two values, such as 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, etc.

[0051] Optionally, as Figure 3 shown, the thickness dimension B of the first insulating portion 11 compressed between the soldering pad 3 and the cover body 2 in the second direction satisfies 0.6 mm ≤ B ≤ 1.5 mm. By setting the thickness dimension B of the first insulating portion 11 compressed between the soldering pad 3 and the cover body 2 in the second direction and limiting the thickness dimension B of the first insulating portion 11 compressed between the soldering pad 3 and the cover body 2 in the second direction to satisfy 0.6 mm ≤ B ≤ 1.5 mm, on the one hand, it is avoided that the thickness of the first insulating portion 11 after being compressed is too thin, resulting in poor insulation and being easily broken down by current, and on the other hand, it is avoided that the thickness of the first insulating portion 11 is too thick after being compressed, thereby increasing the overall structural size and the occupied space.

[0052] In this embodiment, the thickness dimension B of the first insulating portion 11 compressed between the soldering pad 3 and the cover body 2 in the second direction can be any value between 0.6 mm and 1.5 mm or the range between any two values, such as 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, etc.

[0053] Among them, in order to verify the influence of the difference between the thickness dimension T of the side wall of the first groove 111 in the first direction and the depth dimension A of the insertion slot 112 in the first direction and the thickness dimension B of the first insulating portion 11 compressed between the soldering pad 3 and the cover body 2 in the second direction on the insulation performance of the insulating part 1, as shown in Table 1, five groups of embodiments and four groups of comparative examples are provided for verification. After setting the dimensions of the difference between the thickness dimension T of the side wall of the first groove 111 in the first direction and the depth dimension A of the insertion slot 112 in the first direction and the thickness dimension B of the first insulating portion 11 compressed between the soldering pad 3 and the cover body 2 in the second direction, when the voltage is 1500 VDC and the power is on for 2 s, if the leakage current is less than 2 mA and the insulation resistance is greater than 200 megohms at 500 VDC, the product meets the insulation requirements, otherwise it does not meet the insulation requirements.

[0054] Table 1

[0055]

[0056] In Embodiment 1, the depth dimension A of the insertion slot 112 in the first direction is set to 0.5 mm, the thickness dimension T of the side wall of the first groove 111 in the first direction is set to 1.1 mm. At this time, the difference between the thickness dimension T of the side wall of the first groove 111 in the first direction and the depth dimension A of the insertion slot 112 in the first direction is 0.6 mm. The thickness dimension B of the compressed first insulating portion 11 between the soldering station 3 and the cover body 2 in the second direction is set to 0.6 mm. After experimental verification, the leakage current is less than 2 mA, and the insulation resistance is greater than 200 megaohms.

[0057] In Embodiment 2, the depth dimension A of the insertion slot 112 in the first direction is set to 0.5 mm, the thickness dimension T of the side wall of the first groove 111 in the first direction is set to 1.2 mm. At this time, the difference between the thickness dimension T of the side wall of the first groove 111 in the first direction and the depth dimension A of the insertion slot 112 in the first direction is 0.7 mm. The thickness dimension B of the compressed first insulating portion 11 between the soldering station 3 and the cover body 2 in the second direction is set to 0.8 mm. After experimental verification, the leakage current is less than 2 mA, and the insulation resistance is greater than 200 megaohms.

[0058] In Embodiment 3, the depth dimension A of the insertion slot 112 in the first direction is set to 1 mm, the thickness dimension T of the side wall of the first groove 111 in the first direction is set to 1.8 mm. At this time, the difference between the thickness dimension T of the side wall of the first groove 111 in the first direction and the depth dimension A of the insertion slot 112 in the first direction is 0.8 mm. The thickness dimension B of the compressed first insulating portion 11 between the soldering station 3 and the cover body 2 in the second direction is set to 1 mm. After experimental verification, the leakage current is less than 2 mA, and the insulation resistance is greater than 200 megaohms.

[0059] In Embodiment 4, the depth dimension A of the insertion slot 112 in the first direction is set to 1 mm, the thickness dimension T of the side wall of the first groove 111 in the first direction is set to 2 mm. At this time, the difference between the thickness dimension T of the side wall of the first groove 111 in the first direction and the depth dimension A of the insertion slot 112 in the first direction is 1 mm. The thickness dimension B of the compressed first insulating portion 11 between the soldering station 3 and the cover body 2 in the second direction is set to 1.2 mm. After experimental verification, the leakage current is less than 2 mA, and the insulation resistance is greater than 200 megaohms.

[0060] In Embodiment 5, the depth dimension A of the insertion slot 112 in the first direction is set to 1 mm, and the thickness dimension T of the side wall of the first groove 111 in the first direction is set to 3.5 mm. At this time, the difference between the thickness dimension T of the side wall of the first groove 111 in the first direction and the depth dimension A of the insertion slot 112 in the first direction is 2.5 mm. The thickness dimension B of the compressed first insulating portion 11 between the soldering station 3 and the cover body 2 in the second direction is set to 1.5 mm. Through experimental verification, the leakage current is less than 2 mA, and the insulation resistance is greater than 200 MΩ.

[0061] As can be seen from Embodiments 1 to 5, when the difference between the thickness dimension T of the side wall of the first groove 111 in the first direction and the depth dimension A of the insertion slot 112 in the first direction meets the range of 0.6 mm ≤ T - A ≤ 2.5 mm, and the thickness dimension B of the compressed first insulating portion 11 between the soldering station 3 and the cover body 2 in the second direction meets the range of 0.6 mm ≤ B ≤ 1.5 mm, at this time, the insulating member 1 has good insulation performance. Neither the side wall nor the bottom wall of the first insulating portion 11 is penetrated by the current, and no leakage phenomenon occurs.

[0062] In Comparative Example 1, the depth dimension A of the insertion slot 112 in the first direction is set to 0.5 mm, and the thickness dimension T of the side wall of the first groove 111 in the first direction is set to 1 mm. At this time, the difference between the thickness dimension T of the side wall of the first groove 111 in the first direction and the depth dimension A of the insertion slot 112 in the first direction is 0.5 mm. The thickness dimension B of the compressed first insulating portion 11 between the soldering station 3 and the cover body 2 in the second direction is set to 0.7 mm. Through experimental verification, the side wall of the first insulating portion 11 is penetrated, the leakage current is 2.85 mA, and the insulation resistance is 183 MΩ.

[0063] In Comparative Example 2, the depth dimension A of the insertion slot 112 in the first direction is set to 0.5 mm, and the thickness dimension T of the side wall of the first groove 111 in the first direction is set to 1.2 mm. At this time, the difference between the thickness dimension T of the side wall of the first groove 111 in the first direction and the depth dimension A of the insertion slot 112 in the first direction is 0.7 mm. The thickness dimension B of the compressed first insulating portion 11 between the soldering station 3 and the cover body 2 in the second direction is set to 0.54 mm. Through experimental verification, the bottom wall of the first insulating portion 11 is penetrated, the leakage current is 2.37 mA, and the insulation resistance is 189 MΩ.

[0064] In Comparative Example 3, the depth dimension A of the insertion slot 112 in the first direction is set to 1 mm, and the thickness dimension T of the side wall of the first groove 111 in the first direction is set to 1.5 mm. At this time, the difference between the thickness dimension T of the side wall of the first groove 111 in the first direction and the depth dimension A of the insertion slot 112 in the first direction is 0.5 mm. The thickness dimension B of the compressed first insulating portion 11 between the soldering station 3 and the cover body 2 in the second direction is set to 0.7 mm. Through experimental verification, the side wall of the first insulating portion 11 is punctured, the leakage current is 2.64 mA, and the insulation resistance is 181.3 MΩ.

[0065] In Comparative Example 4, the depth dimension A of the insertion slot 112 in the first direction is set to 1 mm, and the thickness dimension T of the side wall of the first groove 111 in the first direction is set to 1.8 mm. At this time, the difference between the thickness dimension T of the side wall of the first groove 111 in the first direction and the depth dimension A of the insertion slot 112 in the first direction is 0.8 mm. The thickness dimension B of the compressed first insulating portion 11 between the soldering station 3 and the cover body 2 in the second direction is set to 0.5 mm. Through experimental verification, the bottom wall of the first insulating portion 11 is punctured, the leakage current is 2.48 mA, and the insulation resistance is 190.2 MΩ.

[0066] It can be seen from Comparative Example 1 and Comparative Example 3 that when the thickness dimension B of the compressed first insulating portion 11 between the soldering station 3 and the cover body 2 in the second direction meets the range of 0.6 mm ≤ B ≤ 1.5 mm, but the difference between the thickness dimension T of the side wall of the first groove 111 in the first direction and the depth dimension A of the insertion slot 112 in the first direction is less than the minimum value of the range of 0.6 mm ≤ T - A ≤ 2.5 mm, at this time, the thickness of the area where the first insulating portion 11 is provided with the insertion slot 112 is too thin, resulting in being punctured by the current and poor insulation protection.

[0067] It can be seen from Comparative Example 2 and Comparative Example 4 that when the difference between the thickness dimension T of the side wall of the first groove 111 in the first direction and the depth dimension A of the insertion slot 112 in the first direction meets the range of 0.6 mm ≤ T - A ≤ 2.5 mm, but the thickness dimension B of the compressed first insulating portion 11 between the soldering station 3 and the cover body 2 in the second direction is less than the minimum value of the range of 0.6 mm ≤ B ≤ 1.5 mm, at this time, the thickness of the area where the first insulating portion 11 is compressed by the soldering station 3 and the cover body 2 is too thin, resulting in being punctured by the current and poor insulation protection.

[0068] Optionally, as Figure 3As shown, the distance dimension C between the surface of the plug-in slot 112 in the second direction away from the cover body 2 and the surface of the first insulating portion 11 in the second direction away from the cover body 2 is satisfied 1.5mm≤C≤3mm. By limiting the distance dimension C between the surface of the plug-in slot 112 in the second direction away from the cover body 2 and the surface of the first insulating portion 11 in the second direction away from the cover body 2, so that it satisfies 1.5mm≤C≤3mm, after the plug-in protrusion 31 is inserted into the plug-in slot 112, the material of the first insulating portion 11 in the second direction with sufficient thickness abuts against the plug-in protrusion 31, so as to ensure the limiting strength of the first insulating portion 11 on the plug-in protrusion 31 in the second direction, thereby improving the reliability of the structure.

[0069] In this embodiment, the distance dimension C between the surface of the plug-in slot 112 along the second direction away from the cover body 2 and the surface of the first insulating part 11 along the second direction away from the cover body 2 can be any value between 1.5 mm and 3 mm or a range between any two values, for example 1.5 mm, 2 mm, 2.5 mm, 3 mm, etc.

[0070] Alternatively, if Figure 1 , Figure 4 As shown, the battery cover also includes an explosion-proof valve 5, and the cover body 2 is also provided with a boss 23 protruding in the direction away from the pole group, and a mounting hole 24 penetrating the boss 23. The explosion-proof valve 5 is embedded in the mounting hole 24, and there is a gap between it and the surface of the cover body 2 facing the pole group. By providing the boss 23 protruding in the direction away from the pole group on the cover body 2, and providing the mounting hole 24 penetrating the boss 23, after the explosion-proof valve 5 is embedded in the mounting hole 24, it can maintain a sufficient gap between it and the surface of the cover body 2 facing the pole group, thereby avoiding corrosion of the explosion-proof valve 5 due to contact of the electrolyte with the explosion-proof valve 5, and improving the protection of the explosion-proof valve 5. In this embodiment, the surface of the boss 23 away from the cover body 2 is lower than the surface of the welding platform 3 away from the cover body 2, thereby avoiding unnecessary interference of the boss 23 during connection.

[0071] Furthermore, if Figure 1 , Figure 4 As shown, the battery cover plate further includes a fixing ring 6, the mounting hole 24 includes a first hole section 241 and a second hole section 242, the aperture of the first hole section 241 is smaller than the aperture of the second hole section 242, and a step surface 243 is formed between the first hole section 241 and the second hole section 242, the explosion-proof valve 5 is arranged in the second hole section 242, and abuts against the step surface 243, the fixing ring 6 is arranged in the second hole section 242, and is located on the side of the explosion-proof valve 5 facing the pole group, and the fixing ring 6 is welded to the cover plate body 2. Through the fixing ring 6 and the step surface 243, the explosion-proof valve 5 is fixed, and the explosion-proof valve 5 is prevented from coming out of the mounting hole 24.

[0072] Alternatively, if Figure 1 , Figure 4 As shown, the battery cover plate also includes a sealing ring 7, which is sleeved on the outside of the explosion-proof valve 5 and abuts against the inner wall of the mounting hole 24. By sleeve-mounting the sealing ring 7 on the outside of the explosion-proof valve 5, the sealing ring 7 is used to fill the gap between the outside of the explosion-proof valve 5 and the inner wall of the mounting hole 24, thereby ensuring the airtightness of the explosion-proof valve 5 and the cover plate body 2 after assembly, thereby ensuring its pressure relief and explosion-proof capabilities. In this embodiment, a mounting groove is also provided on the inner side of the sealing ring 7, and the explosion-proof valve 5 is embedded in the mounting groove, thereby ensuring the reliability of the connection between the sealing ring 7 and the explosion-proof valve 5.

[0073] Alternatively, if Figure 1 , Figure 4 As shown, the battery cover also includes a protective sheet 8, which is arranged on the side of the boss 23 away from the electrode group and is used to close the mounting hole 24. By arranging the protective sheet 8 for closing the mounting hole 24 on the side of the boss 23 away from the electrode group, the explosion-proof valve 5 is protected to prevent external factors from damaging the explosion-proof valve 5. In this embodiment, the protective sheet 8 is a protective patch, which is connected to the boss 23 by bonding.

[0074] Optionally, the battery cover also includes an insulating sheet, which is attached to the side of the cover body 2 facing the electrode group, and is provided with an exhaust hole corresponding to the explosion-proof valve 5 and an escape hole for avoiding the second insulating portion 12. By arranging the insulating sheet on the side of the cover body 2 facing the electrode group, the electrode ear of the electrode group is prevented from accidentally touching the metal cover body 2, thereby ensuring good insulation performance. In this embodiment, the insulating sheet is an insulating patch, which is bonded to the cover body 2 by bonding.

[0075] In this embodiment, a battery is also provided, which includes a pole group and a shell, the shell is a hollow shell structure with an opening, and the battery cover is arranged at the opening of the shell and closes the shell to form a storage cavity for accommodating the pole group. By using the above-mentioned battery cover, the battery reduces the number of parts and components, thereby reducing the manufacturing cost, and greatly improves the efficiency of the assembly operation and increases the production capacity due to the reduction of assembly processes.

[0076] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should 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: An insulating member, the insulating member comprising a first insulating portion, a second insulating portion and a plurality of fixing portions arranged between the first insulating portion and the second insulating portion, the first insulating portion being provided with a first groove and a plug-in groove arranged on a side wall of the first groove, and the second insulating portion being provided with a second groove; A cover body, wherein fixing holes corresponding to the fixing parts are formed on the cover body, the cover body is arranged between the first insulating part and the second insulating part, and the fixing parts are inserted into the corresponding fixing holes; A soldering platform, wherein a plug-in protrusion is provided on one side of the soldering platform facing the cover body, the soldering platform is arranged in the first groove, and the plug-in protrusion is inserted in the plug-in groove; A pole, the pole comprising a column part and a connecting part connected to the column part, the connecting part is arranged in the second groove, the column part sequentially passes through the second insulating part, the cover plate body, the first insulating part and is welded to the welding platform; The depth dimension of the plug-in slot along the first direction is A, the thickness dimension of the side wall of the first groove along the first direction is T, and 0.6 mm≤TA≤2.5 mm is satisfied.

2. The battery cover plate according to claim 1, characterized in that, A depth dimension A of the insertion slot along the first direction satisfies 0.5 mm ≤ A ≤ 3 mm.

3. The battery cover plate according to claim 1, wherein The thickness dimension of the first insulating portion compressed between the soldering station and the cover body along the second direction is B, and satisfies 0.6 mm≤B≤1.5 mm.

4. The battery cover plate according to claim 1, characterized in that, A distance dimension C between a surface of the plug slot facing away from the cover body along the second direction and a surface of the first insulating portion facing away from the cover body along the second direction is satisfied, and 1.5 mm≤C≤3 mm.

5. The battery cover plate according to claim 1, characterized in that, The battery cover also includes an explosion-proof valve. The cover body is also provided with a boss protruding in a direction away from the pole group, and a mounting hole passing through the boss. The explosion-proof valve is embedded in the mounting hole and is spaced apart from the surface of the cover body facing the pole group.

6. The battery cover plate according to claim 5, characterized in that The battery cover plate also includes a fixing ring, the mounting hole includes a first hole segment and a second hole segment, the aperture of the first hole segment is smaller than the aperture of the second hole segment, so as to form a step surface between the first hole segment and the second hole segment, the explosion-proof valve is arranged in the second hole segment and abuts against the step surface, the fixing ring is arranged in the second hole segment and is located on the side of the explosion-proof valve facing the pole group, and the fixing ring is welded to the cover plate body.

7. The battery cover plate according to claim 5, wherein, The battery cover plate also includes a sealing ring, which is sleeved on the outer side of the explosion-proof valve and abuts against the inner wall of the mounting hole.

8. The battery cover plate according to claim 5, characterized in that, The battery cover also includes a protective sheet, which is arranged on a side of the boss away from the electrode group and is used to close the mounting hole.

9. The battery cover plate according to claim 5, wherein The battery cover also includes an insulating sheet, which is attached to a side of the cover body facing the electrode group and is provided with an exhaust hole corresponding to the explosion-proof valve and an escape hole for evacuating the second insulating portion.

10. Battery, characterized in that, The battery includes a pole group, a battery housing, and a battery cover plate as described in any one of claims 1-9. The battery housing is a hollow housing structure with an opening. The battery cover plate is covered on the opening of the battery housing and closes the battery housing to form a receiving cavity for accommodating the pole group.

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