Battery cover plate

Abstract

The invention belongs to the technical field of batteries, and discloses a battery cover plate, the battery cover plate comprises a cover plate body, a pole, a sealing ring and a fixing piece, the cover plate body is provided with an insertion through hole, the pole comprises a limiting part and an insertion part, the insertion part is provided with an external thread and is inserted in the insertion through hole, the limiting part abuts against one side of the cover plate body, and the sealing ring is arranged in the insertion through hole. The sealing ring is arranged on the inserting part in a sleeving mode and compressed between the limiting part and the cover plate body, the fixing piece is arranged on the other side of the cover plate body and provided with a connecting threaded hole in threaded connection with the inserting part, the thickness size of the sealing ring before compression is F, the thickness size of the sealing ring after compression is W, and the formula that (F-W) / F * 100% is larger than 20% and smaller than 45% is met. The problem that the compression amount of the sealing ring cannot be adjusted after the sealing ring is finished is solved, and meanwhile the compression amount of the sealing ring is within the range of good sealing performance, so that the qualified rate of finished products is increased, material waste is reduced, and the production cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and particularly to a battery cover plate. 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 directly relates to the safety and long-term reliability of the battery. The battery cover plate has functions of insulation, sealing, current conduction, pressure relief, and fuse protection. The current conduction function is realized by welding the pole column on the battery cover plate to the tab of the electrode group, so as to realize the current conduction function. The insulation function is realized by sleeving a plastic part on the pole column to avoid contact between the pole column and the light aluminum plate, so as to realize the insulation function. And because the battery interior is also filled with electrolyte, a sealing ring is arranged in the battery cover plate to seal the battery cover plate, so as to avoid leakage of the electrolyte.

[0003] At present, the sealing ring of the battery cover plate is compressed during the assembly process to fill the gaps on the battery cover plate to achieve the sealing effect. Since multiple components in the battery cover plate need to be connected by riveting or welding processes, when the sealing of the battery cover plate is poor after assembly, since the compression amount of the sealing ring cannot be adjusted, the leakage situation of the battery cover plate cannot be improved, resulting in the battery cover plate being only treated as scrap, which not only greatly reduces the qualified rate of finished products, but also wastes a large amount of materials and increases the production cost. Summary of the Invention

[0004] The purpose of the present invention is to provide a battery cover plate, which has a high qualified rate of finished products, reduces material waste, and lowers the production cost.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] There is provided a battery cover plate, which includes a cover plate body, a pole column, a sealing ring, and a fixing member. A plugging through hole penetrating the cover plate body is provided on the cover plate body. The pole column includes a limiting portion and a plugging portion. The plugging portion is provided with an external thread and is inserted into the plugging through hole. The limiting portion abuts against one side of the cover plate body. The sealing ring is sleeved on the plugging portion and is compressed between the limiting portion and the cover plate body. The fixing member is provided on the other side of the cover plate body and is provided with a connecting threaded hole threadedly connected to the plugging portion;

[0007] The thickness dimension of the sealing ring along the first direction before being compressed is F, and the thickness dimension of the sealing ring along the first direction after being compressed is W, and it satisfies that 20% < (F - W) / F × 100% < 45%.

[0008] Optionally, the battery cover also includes a first insulating member, which is sleeved on the plug-in portion and clamped between the limiting portion and the sealing ring, and the projection of the limiting portion on the cover body along the first direction is contained in the projection of the first insulating member on the cover body along the first direction.

[0009] Optionally, a distance dimension along the first direction between a surface of the first insulating member closest to the cover body and the cover body is H, a pitch dimension of the external thread on the plug-in portion is P, and 0.5≤P / H≤1 is satisfied.

[0010] Optionally, a pitch dimension P of the external thread on the plug-in portion satisfies 0.2 mm ≤ P ≤ 1 mm.

[0011] Optionally, the battery cover also includes a second insulating member, which is located on the other side of the cover body and is formed with a through hole connected to the plug-in through hole. One side of the second insulating member is also formed with a receiving groove, and the fixing member mounted on the plug-in portion is accommodated in the receiving groove.

[0012] Optionally, one of the inner side wall of the accommodating groove and the outer curved surface of the fixing member is provided with an inserting protrusion, and the other of the inner side wall of the accommodating groove and the outer curved surface of the fixing member is provided with an inserting groove, and the inserting protrusion is inserted in the inserting groove.

[0013] Optionally, a fixed flange is further provided on the other side of the cover body and is arranged around the outer edge of the plug-in through hole, and the fixed flange is inserted into the second insulating member.

[0014] Optionally, the first insulating member includes an abutment portion and a covering portion, the abutment portion is sleeved on the plug-in portion and clamped between the limiting portion and the sealing ring, the covering portion is arranged on a side of the abutment portion away from the central axis of the pole, and the covering portion is used to cover the outer side surface of the limiting portion.

[0015] Optionally, a first limiting groove is formed on the cover body, the plug-in through hole is formed at the bottom of the first limiting groove, and the sealing ring is accommodated in the first limiting groove.

[0016] Optionally, the battery cover is further provided with an insulating film, and the insulating film is attached to the other side of the cover body.

[0017] Beneficial effects of the present invention:

[0018] The present invention provides a battery cover plate. By providing an external thread on the insertion part of the pole column and providing a connecting threaded hole on the fixing part provided on the cover plate body, after the insertion part is threadedly connected to the fixing part, the length of the pole column inserted can be adjusted by screwing the pole column, thereby indirectly realizing the adjustment of the compression amount of the sealing ring clamped between the pole column limiting part and the cover plate body, avoiding the problem that the compression amount of the sealing ring cannot be adjusted once the battery cover plate is finished. By limiting the thickness dimension F of the sealing ring before compression and the thickness dimension W of the sealing ring after compression, making the two satisfy 20% < (F - W) / F × 100% < 45%, the compression amount of the sealing ring is limited, so that the sealing ring within this compression amount range has good sealing performance, thereby improving the sealing effect, increasing the qualified rate of the finished product, reducing the waste of materials, and reducing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is an exploded view of the battery cover plate provided by the present invention from the first perspective;

[0020] Figure 2 is an exploded view of the battery cover plate provided by the present invention from the second perspective;

[0021] Figure 3 is a partial structural cross-sectional view of the battery cover plate provided by the present invention;

[0022] Figure 4 is a schematic diagram of the battery cover plate provided by the present invention before and after the compression of the sealing ring;

[0023] Figure 5 is a schematic structural diagram of the pole column in the battery cover plate provided by the present invention;

[0024] Figure 6 is a front view of the pole column in the battery cover plate provided by the present invention;

[0025] Figure 7 is Figure 6 an enlarged view of the structure of part A in

[0026] Figure 8 is a schematic connection structure diagram of the fixing part and the second insulating part in the battery cover plate provided by the present invention;

[0027] Figure 9 is a cross-sectional view of the connection structure of the fixing part and the second insulating part in the battery cover plate provided by the present invention;

[0028] Figure 10 is a cross-sectional view of the structure of the first insulating part in the battery cover plate provided by the present invention;

[0029] Figure 11 is a cross-sectional view of the structure of the second insulating part in the battery cover plate provided by the present invention.

[0030] In the figure:

[0031] 1. Cover body; 11. Insertion through hole; 12. Fixed flange; 13. First limiting groove;

[0032] 2. Terminal post; 21. Limiting part; 22. Insertion part;

[0033] 3. Sealing ring;

[0034] 4. Fixing member; 41. Connecting threaded hole; 42. Insertion protrusion;

[0035] 5. First insulating member; 51. Abutting part; 52. Wrapping part; 53. Second limiting groove;

[0036] 6. Second insulating member; 61. Through hole; 62. Accommodating groove; 63. Insertion groove;

[0037] 7. Insulating film. Detailed implementation manners

[0038] 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 are shown in the drawings, rather than all structures.

[0039] 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 communication inside two elements or the interaction relationship between two elements. 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.

[0040] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include 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 that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is at a higher horizontal height than the second feature. The first feature being "below", "below", and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the first feature is at a lower horizontal height than the second feature.

[0041] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "right", etc. are based on the orientation or positional relationships shown in the drawings. They are only for the convenience of description and simplifying the 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.

[0042] 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 battery cover plate has functions of insulation, sealing, current conduction, pressure relief, and fuse protection. To achieve current conduction, the pole column on the battery cover plate is welded to the tab of the electrode group, thereby realizing the current conduction function. To achieve the insulation function, a plastic part is sleeved on the pole column to prevent contact between the pole column and the light aluminum plate, thereby realizing the insulation function. And because the battery interior is also filled with electrolyte, a sealing ring is provided in the battery cover plate to seal the battery cover plate, thereby preventing electrolyte leakage.

[0043] Currently, the sealing ring of the battery cover plate is compressed during the assembly process to fill the gaps on the battery cover plate and achieve the sealing effect. Since multiple components in the battery cover plate need to be connected by riveting or welding processes, when the sealing of the battery cover plate is poor after assembly, due to the fact that the compression amount of the sealing ring cannot be adjusted, the leakage situation of the battery cover plate cannot be improved, resulting in the battery cover plate being scrapped. This not only greatly reduces the finished product qualification rate but also wastes a large amount of materials and increases the production cost.

[0044] Therefore, in order to improve the qualification rate of finished products, avoid material waste, and reduce production costs, this embodiment provides a battery cover plate.

[0045] As Figures 1 to 11 shown, the battery cover plate includes a cover plate body 1, a pole column 2, a sealing ring 3, and a fixing part 4. A plugging through hole 11 penetrating the cover plate body 1 is provided on the cover plate body 1. The pole column 2 includes a limiting part 21 and a plugging part 22. The plugging part 22 is provided with an external thread and is inserted into the plugging through hole 11. The limiting part 21 abuts against one side of the cover plate body 1. The sealing ring 3 is sleeved on the plugging part 22 and is compressed between the limiting part 21 and the cover plate body 1. The fixing part 4 is provided on the other side of the cover plate body 1 and is provided with a connection threaded hole 41 threadedly connected to the plugging part 22; the thickness dimension of the sealing ring 3 along the first direction before being compressed is F, and the thickness dimension of the sealing ring 3 along the first direction after being compressed is W, and it satisfies that 20% < (F - W) / F × 100% < 45%.

[0046] By providing an external thread on the insertion part 22 of the terminal post 2 and opening a connecting threaded hole 41 in the fixing member 4 provided on the cover plate body 1, after the insertion part 22 is threadedly connected to the fixing member 4, the length of the insertion of the terminal post 2 can be adjusted by screwing the terminal post 2, thereby indirectly realizing the adjustment of the compression amount of the sealing ring 3 clamped between the limiting part 21 of the terminal post 2 and the cover plate body 1, avoiding the problem that the compression amount of the sealing ring 3 cannot be adjusted once the battery cover plate is a finished product, and by limiting the thickness dimension F of the sealing ring 3 before compression and the thickness dimension W of the sealing ring 3 after compression, making the two satisfy 20% < (F - W) / F × 100% < 45%, the compression amount of the sealing ring 3 is limited, so that the sealing ring 3 within this compression amount range has good sealing performance, thereby improving the sealing effect, increasing the qualified rate of the finished product, reducing the waste of materials, and lowering the production cost.

[0047] Among them, this battery cover plate can be used on various different types of batteries, such as blade batteries or square shell batteries, etc. In this embodiment, the terminal post 2 is manufactured by an integral molding process to simultaneously obtain the limiting part 21 and the insertion part 22 of the terminal post 2, and in order to ensure the insulation of the terminal post 2, the fixing member 4 threadedly connected to the insertion part 22 of the terminal post 2 is manufactured by an injection molding process, on the one hand, realizing the connection between the terminal post 2 and the cover plate body 1, and on the other hand, ensuring the insulation of the fixing member 4. Among them, the cover plate body 1 is manufactured using a light aluminum plate.

[0048] In order to verify the influence of the ratio of the compression amount to the thickness of the sealing ring 3 before compression on the sealing effect, as shown in Table 1, helium leak detection tests are carried out by setting five groups of examples and three groups of comparative examples, where the helium leak detection rate result is less than 1×10 -7 Pa·m 3 / s, then the sealing performance is qualified.

[0049] Table 1

[0050]

[0051] In Example 1, the thickness dimension F of the sealing ring 3 before compression is set to 1.1 mm. By compressing the sealing ring 3, the thickness dimension W of the sealing ring 3 after compression is 0.89 mm. At this time, the ratio of the compression amount to the thickness of the sealing ring 3 before compression, that is, (F - W) / F × 100% = 19.09%. After the helium leak detection test, its helium leak detection rate is 2.5×10 -7 Pa·m 3 / s, and the sealing performance is NG.

[0052] In Example 2, the thickness dimension F of the sealing ring 3 before compression is set to 1.2 mm. By compressing the sealing ring 3, the thickness dimension W of the sealing ring 3 after compression is 0.816 mm. At this time, the ratio of the compression amount to the thickness of the sealing ring 3 before compression, that is, (F - W) / F×100% = 32.00%. After the helium leak detection test, its helium leak rate is 8.6×10 -8 Pa·m 3 / s, and the sealing performance is OK.

[0053] In Example 3, the thickness dimension F of the sealing ring 3 before compression is set to 1.3 mm. By compressing the sealing ring 3, the thickness dimension W of the sealing ring 3 after compression is 1.05 mm. At this time, the ratio of the compression amount to the thickness of the sealing ring 3 before compression, that is, (F - W) / F×100% = 19.23%. After the helium leak detection test, its helium leak rate is 4.73×10 -7 Pa·m 3 / s, and the sealing performance is NG.

[0054] In Example 4, the thickness dimension F of the sealing ring 3 before compression is set to 1.35 mm. By compressing the sealing ring 3, the thickness dimension W of the sealing ring 3 after compression is 0.75 mm. At this time, the ratio of the compression amount to the thickness of the sealing ring 3 before compression, that is, (F - W) / F×100% = 44.44%. After the helium leak detection test, its helium leak rate is 4.26×10 -8 Pa·m 3 / s, and the sealing performance is OK.

[0055] In Example 5, the thickness dimension F of the sealing ring 3 before compression is set to 1.5 mm. By compressing the sealing ring 3, the thickness dimension W of the sealing ring 3 after compression is 1.25 mm. At this time, the ratio of the compression amount to the thickness of the sealing ring 3 before compression, that is, (F - W) / F×100% = 16.67%. After the helium leak detection test, its helium leak rate is 2.03×10 -7 Pa·m 3 / s, and the sealing performance is NG.

[0056] From Example 1 to Example 5, it can be seen that when the ratio of the compression amount to the thickness of the sealing ring 3 before compression, that is, (F - W) / F, is not within the range of 20% to 45%, its helium leak rate is greater than 1×10 -7 Pa·m 3 / s, and the sealing performance is unqualified. When the ratio of the compression amount to the thickness of the sealing ring 3 before compression, that is, (F - W) / F, is within the range of 20% to 45%, its helium leak rate is less than 1×10 -7 Pa·m 3 / s, and the sealing performance is qualified.

[0057] In Comparative Example 1, after screwing the terminal post 2 downward by 0.1 mm on the basis of Example 1, the thickness of the sealing ring 3 after compression is 0.79 mm at this time. The ratio of the compression amount to the thickness of the sealing ring 3 before compression, that is, (F - W) / F = 28.18%, and its helium leak detection rate is 6.4×10 -8 Pa·m 3 / s, and the sealing performance is OK.

[0058] In Comparative Example 2, after screwing the terminal post 2 downward by 0.1 mm on the basis of Example 3, the thickness of the sealing ring 3 after compression is 0.95 mm at this time. The ratio of the compression amount to the thickness of the sealing ring 3 before compression, that is, (F - W) / F = 26.92%, and its helium leak detection rate is 9×10 -8 Pa·m 3 / s, and the sealing performance is OK.

[0059] In Comparative Example 3, after screwing the terminal post 2 downward by 0.25 mm on the basis of Example 5, the thickness of the sealing ring 3 after compression is 1 mm at this time. The ratio of the compression amount to the thickness of the sealing ring 3 before compression, that is, (F - W) / F = 33.33%, and its helium leak detection rate is 7.32×10 -8 Pa·m 3 / s, and the sealing performance is OK.

[0060] It can be seen from Comparative Example 1 to Comparative Example 3 that by screwing the terminal post 2 to change the thickness dimension W of the sealing ring 3 after compression, increasing the compression amount, when the ratio of the compression amount to the thickness of the sealing ring 3 before compression, that is, (F - W) / F, is in the range of 20% to 45%, its helium leak detection rate is less than 1×10 -7 Pa·m 3 / s, and the sealing performance is qualified. Thus, Examples 1, 3, and 5 that originally did not meet the sealing requirements are changed into products with qualified sealing performance, thereby improving the qualified rate of the products, and there is no need to scrap the battery covers of Examples 1, 3, and 5.

[0061] Optionally, as Figure 3 shown, the battery cover further includes a first insulating member 5. The first insulating member 5 is sleeved on the plug-in portion 22 and is clamped between the limiting portion 21 and the sealing ring 3. The projection of the limiting portion 21 on the cover body 1 in the first direction is included in the projection of the first insulating member 5 on the cover body 1 in the first direction. By providing the first insulating member 5 and making the projection of the limiting portion 21 on the cover body 1 in the first direction be included in the projection of the first insulating member 5 on the cover body 1 in the first direction, the limiting portion 21 of the terminal post 2 is insulated and protected. In this embodiment, the first insulating member 5 is made of a plastic material.

[0062] Optionally, as Figure 3 、Figure 6 , Figure 7 As shown in Figure 7 , the spacing dimension in the first direction between the surface of the first insulating member 5 closest to the cover plate body 1 and the cover plate body 1 is H, the pitch dimension of the external thread on the insertion portion 22 is P, and 0.5 ≤ P / H ≤ 1 is satisfied. By limiting the pitch dimension P of the external thread on the insertion portion 22 and the spacing dimension H between the surface of the first insulating member 5 in contact with the sealing ring 3 and one side of the cover plate body 1, so that the two satisfy 0.5 ≤ P / H ≤ 1, sufficient space dimension is reserved for the deformation of the sealing ring 3, in order to obtain a better sealing effect.

[0063] Furthermore, as Figure 5 , Figure 6 , Figure 7 shown, the pitch dimension P of the external thread on the insertion portion 22 satisfies 0.2 mm ≤ P ≤ 1 mm. By further limiting the pitch dimension P of the external thread on the insertion portion 22 to satisfy 0.2 mm ≤ P ≤ 1 mm, the distance of rising or falling when the pole column 2 is screwed one turn is determined, so that a more precise adjustment of the compression amount can be realized.

[0064] In this embodiment, the pitch dimension P of the external thread on the insertion portion 22 can be any value between 0.2 mm and 1 mm or the range between any two values, such as 0.2 mm, 0.4 mm, 0.6 mm, 0.8 mm, 1 mm, etc.

[0065] Optionally, as Figure 1 , Figure 3 , Figure 11 shown, the battery cover plate further includes a second insulating member 6. The second insulating member 6 is located on the other side of the cover plate body 1 and is formed with a through hole 61 communicating with the insertion through hole 11. A receiving groove 62 is also formed on one side of the second insulating member 6. The fixing member 4 sleeved on the insertion portion 22 is received in the receiving groove 62.

[0066] By providing the second insulating member 6 on the other side of the cover plate body 1 and forming the through hole 61 communicating with the insertion through hole 11 on the second insulating member 6, when the insertion portion 22 of the pole column 2 passes through the through hole 61 and is threadedly connected to the connection threaded hole 41 of the fixing member 4, it can play an insulating and protective role for the insertion portion 22 of the pole column 2, cooperate with the first insulating member 5, further improve the insulating and protective effect, and form the receiving groove 62 for accommodating the fixing member 4 on the second insulating member 6, so that there is an overlapping area between the second insulating member 6 and the fixing member 4 in space, thereby reducing the occupied space, reserving a larger space for the electrode group, in order to increase the size of the electrode group and improve the power supply capacity.

[0067] Among them, the outer shape of the fixing member 4 and the shape of the receiving groove 62 are adapted to each other, so that the fixing member 4 fits more closely with the second insulating member 6. In this embodiment, the cross-section of the fixing member 4 is circular, and the receiving groove 62 is a circular groove adapted to the fixing member 4.

[0068] Furthermore, as Figure 9 , Figure 11 shown, one of the inner side wall of the receiving groove 62 and the outer curved surface of the fixing member 4 is provided with a plugging protrusion 42, and the other of the inner side wall of the receiving groove 62 and the outer curved surface of the fixing member 4 is provided with a plugging groove 63, and the plugging protrusion 42 is inserted into the plugging groove 63. By providing a plugging protrusion 42 on one of the inner side wall of the receiving groove 62 and the outer curved surface of the fixing member 4, and providing a plugging groove 63 on the other of the inner side wall of the receiving groove 62 and the outer curved surface of the fixing member 4, the plugging protrusion 42 and the plugging groove 63 are used to cooperate with each other, so that the fixing member 4 and the second insulating member 6 are connected into one body, and the separation of the fixing member 4 and the second insulating member 6 is avoided.

[0069] In this embodiment, the plugging protrusion 42 is provided on the outer curved surface of the fixing member 4, and the plugging groove 63 is provided on the inner side wall of the receiving groove 62. The plugging protrusion 42 can be a multi-segment spaced protrusion structure or an integral annular protrusion, and its specific form can be freely set according to requirements.

[0070] Optionally, as Figure 2 shown, the other side of the cover plate body 1 is also provided with a fixing flange 12 that is annularly arranged along the outer edge of the plugging through hole 11, and the fixing flange 12 is inserted into the second insulating member 6. Since the second insulating member 6 is formed on the cover plate body 1 by an injection molding process, by providing the fixing flange 12 on the cover plate body 1, when the second insulating member 6 is injection molded, the second insulating member 6 can cover the fixing flange 12 inside, so as to realize the connection and fixation between the second insulating member 6 and the cover plate body 1.

[0071] In this embodiment, the fixing flange 12 of the cover plate body 1 is formed by a stamping process. The fixing flange 12 can be a multi-segment spaced structure or an integral annular structure, and its specific form can be freely set according to requirements.

[0072] Optionally, as Figure 10As shown, the first insulating member 5 includes an abutting portion 51 and a covering portion 52, the abutting portion 51 is sleeved on the plug-in portion 22 and is sandwiched between the limiting portion 21 and the sealing ring 3, and the covering portion 52 is arranged on the side of the abutting portion 51 away from the central axis of the pole 2, and the covering portion 52 is used to cover the outer side of the limiting portion 21. By providing the abutting portion 51 and making the abutting portion 51 sandwiched between the limiting portion 21 and the sealing ring 3, the surface of the limiting portion 21 of the pole 2 facing the sealing ring 3 is insulated and protected, and the abutting portion 51 is formed on the side of the abutting portion 51 away from the central axis of the pole 2 and extends in a direction away from the pole group to cover the outer side of the limiting portion 21, thereby providing insulation protection for the outer side of the limiting portion 21, and the contact area between the first insulating member 5 and the pole 2 is increased by the abutting portion 51 and the covering portion 52, thereby improving the performance of insulation protection.

[0073] Alternatively, if Figure 1 As shown, a first limiting groove 13 is provided on the cover body 1, and the plug-in through hole 11 is provided at the bottom of the first limiting groove 13, and the sealing ring 3 is accommodated in the first limiting groove 13. By forming the first limiting groove 13 on the cover body 1, after the sealing ring 3 is accommodated in the first limiting groove 13, the first limiting groove 13 is used to limit the sealing ring 3, so as to prevent the sealing ring 3 from being dislocated and affecting the sealing effect.

[0074] In this embodiment, in order to strengthen the limiting strength of the sealing ring 3, the abutment portion 51 of the first insulating member 5 is provided with a second limiting groove 53 on the side facing the sealing ring 3, so that the first limiting groove 13 and the second limiting groove 53 cooperate with each other to limit the two ends of the sealing ring 3 respectively, thereby strengthening the limiting strength of the sealing ring 3 and improving the sealing effect.

[0075] Alternatively, if Figure 1 As shown, the battery cover is also provided with an insulating film 7, which is attached to the other side of the cover body 1. By attaching the insulating film 7 to the other side of the cover body 1, the inner surface of the cover body 1 facing the electrode group is insulated and protected to prevent the electrode ear of the electrode group from contacting the cover body 1, resulting in the risk of short circuit. In other embodiments, the cover body 1 can also be insulated and protected by spraying an insulating coating on the inner surface of the cover body 1 facing the electrode group.

[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 a cover body, a pole, a sealing ring and a fixing member, the cover body is provided with a plug-in through hole penetrating the cover body, the pole comprises a limiting portion and a plug-in portion, the plug-in portion is provided with an external thread and is inserted into the plug-in through hole, the limiting portion abuts against one side of the cover body, the sealing ring is sleeved on the plug-in portion and is compressed between the limiting portion and the cover body, the fixing member is provided on the other side of the cover body and is provided with a connecting threaded hole threadedly connected to the plug-in portion; The thickness dimension of the sealing ring in the first direction before being compressed is F, and the thickness dimension of the sealing ring along the first direction after being compressed is W, and the condition is satisfied: 20%<(FW) / F×100%<45%.

2. The battery cover plate according to claim 1, wherein The battery cover also includes a first insulating member, which is sleeved on the plug-in portion and clamped between the limiting portion and the sealing ring, and the projection of the limiting portion on the cover body along the first direction is contained in the projection of the first insulating member on the cover body along the first direction.

3. The battery cover plate according to claim 2, wherein The distance between the surface of the first insulating member closest to the cover body and the cover body along the first direction is H, the pitch of the external thread on the plug-in portion is P, and 0.5≤P / H≤1 is satisfied.

4. The battery cover plate according to claim 3, wherein, The pitch dimension P of the external thread on the plug-in portion satisfies 0.2mm≤P≤1mm.

5. The battery cover plate according to claim 1, characterized in that, The battery cover also includes a second insulating member, which is located on the other side of the cover body and is formed with a through hole connected to the plug-in through hole. One side of the second insulating member is also formed with a receiving groove, and the fixing member mounted on the plug-in portion is accommodated in the receiving groove.

6. The battery cover plate according to claim 5, characterized in that, One of the inner side wall of the accommodating groove and the outer curved surface of the fixing piece is provided with an inserting protrusion, and the other of the inner side wall of the accommodating groove and the outer curved surface of the fixing piece is provided with an inserting groove, and the inserting protrusion is inserted in the inserting groove.

7. The battery cover plate according to claim 5, characterized in that, A fixed flange is also provided on the other side of the cover body and is arranged around the outer edge of the plug-in through hole. The fixed flange is inserted into the second insulating member.

8. The battery cover plate according to claim 2, characterized in that, The first insulating member includes an abutment portion and a covering portion, wherein the abutment portion is sleeved on the plug-in portion and clamped between the limiting portion and the sealing ring, and the covering portion is arranged on a side of the abutment portion away from the central axis of the pole, and the covering portion is used to cover the outer side surface of the limiting portion.

9. The battery cover plate according to claim 1, wherein The cover plate body is provided with a first limiting groove, the plug-in through hole is provided at the groove bottom of the first limiting groove, and the sealing ring is accommodated in the first limiting groove.

10. The battery cover plate according to claim 1, characterized in that, The battery cover is also provided with an insulating film, and the insulating film is attached to the other side of the cover body.

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