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 cover plate body provided with a mounting through hole, a sealing member and a pole, the sealing member comprises a first sealing part and a second sealing part, the first sealing part is inserted in the mounting through hole and is provided with an insertion through hole, the pole comprises a pole body part and a plate body part, and the plate body part is inserted in the first sealing part. The post body part is inserted into the insertion through hole and is connected to the cover plate body in an insulating manner, the diameter size of the post body part is D, the diameter size of the insertion through hole is d, and when the post and the cover plate body are riveted, 0.5 mm < = (D-d) < = 1.75 mm, or when the post and the cover plate body are not riveted, 1.5 mm < = (D-d) < = 2.5 mm. On one hand, the sealing property and the insulating property are improved through the interference fit of the pole and the sealing element, and on the other hand, the interference magnitude under different connection conditions is specifically set, so that the interference magnitude is prevented from being too large, the sealing element can still keep better elasticity and shape, and the service life of the sealing element is prolonged.

Description

Technical Field

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

[0002] With the development and wide use of lithium batteries in the fields of automotive power and energy storage, the sealing performance and insulation performance of the cell cover plate play a crucial role. Currently, the cover plate generally realizes the sealing and insulation between the inside and outside of the cell by compressing a sealing ring to fill the gap between the light aluminum plate and the pole column.

[0003] Since the battery will undergo multiple charge and discharge cycles during use, the pole column expands due to heat, and the pole column will excessively squeeze the sealing ring. As a result, under long-term excessive squeezing, the sealing ring will be worn or even broken due to excessive deformation, thereby reducing the sealing performance and service life of the sealing ring. Therefore, adopting an interference fit to assemble the pole column and the sealing ring can provide a certain free space for the sealing ring, enabling it to maintain good elasticity and shape under normal use conditions and ensuring the service life of the sealing ring.

[0004] However, when an interference fit is adopted between the sealing ring and the pole column, it is easy for the sealing ring to be eccentric on one side, resulting in an excessive gap on one side, causing electrolyte leakage from the gap, thereby reducing the sealing performance and insulation performance. Summary of the Invention

[0005] The purpose of the present invention is to provide a battery cover plate and a battery, which have a long service life, high sealing performance and insulation performance.

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

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

[0008] A cover plate body, on which an installation through hole is provided;

[0009] A sealing member, the sealing member includes a first sealing portion and a second sealing portion. The first sealing portion is inserted into the installation through hole and is provided with a plugging through hole. The second sealing portion is arranged at one end of the first sealing portion along a first direction and is continuously arranged around the circumferential edge of the first sealing portion;

[0010] A pole column, the pole column includes a column body portion and a plate body portion. The column body portion is inserted into the plugging through hole and is insulated and connected to the cover plate body. The plate body portion is connected to one end of the column body portion along the first direction, and the second sealing portion is clamped between the plate body portion and the cover plate body;

[0011] The diameter of the cylindrical part is D, and the diameter of the insertion through hole is d. When the pole column and the cover plate body are riveted, 0.5 mm ≤ (D - d) ≤ 1.75 mm is satisfied; or when the pole column and the cover plate body are not riveted, 1.5 mm ≤ (D - d) ≤ 2.5 mm is satisfied.

[0012] Optionally, one of the cylindrical part and the first sealing part is provided with a first sealing groove, and the other of the cylindrical part and the first sealing part is provided with a first sealing boss inserted into the first sealing groove;

[0013] The width dimension of the first sealing boss in the first direction is H1, and the width dimension of the first sealing groove in the first direction is h1. When the pole column and the cover plate body are riveted, 0.1 mm ≤ (H1 - h1) ≤ 0.35 mm is satisfied; or when the pole column and the cover plate body are not riveted, 0.3 mm ≤ (H1 - h1) ≤ 0.5 mm is satisfied.

[0014] Optionally, the width dimension of the first sealing boss in the second direction is T1, and the width dimension of the first sealing groove in the second direction is t1. When the pole column and the cover plate body are riveted, 0.05 mm ≤ (T1 - t1) ≤ 0.2 mm is satisfied; or when the pole column and the cover plate body are not riveted, 0.15 mm ≤ (T1 - t1) ≤ 0.25 mm is satisfied.

[0015] Optionally, one of the plate part and the second sealing part is provided with a second sealing groove, and the other of the plate part and the second sealing part is provided with a second sealing boss;

[0016] The width dimension of the second sealing boss in the first direction is H2, and the width dimension of the second sealing groove in the first direction is h2. When the pole column and the cover plate body are riveted, 0.05 mm ≤ (H2 - h2) ≤ 0.25 mm is satisfied; or when the pole column and the cover plate body are not riveted, 0.2 mm ≤ (H2 - h2) ≤ 0.3 mm is satisfied.

[0017] Optionally, the width dimension of the second sealing boss in the second direction is T2, and the width dimension of the second sealing groove in the second direction is t2. When the pole column and the cover plate body are riveted, 0.1 mm ≤ (T2 - t2) ≤ 0.35 mm is satisfied; or when the pole column and the cover plate body are not riveted, 0.3 mm ≤ (T2 - t2) ≤ 0.5 mm is satisfied.

[0018] Optionally, a plurality of groups of the first sealing grooves and the first sealing bosses are arranged at equal intervals between the cylindrical part and the first sealing part in the first direction.

[0019] Optionally, a plurality of groups of second sealing grooves and second sealing bosses are provided at equal intervals between the plate body portion and the second sealing portion along the second direction.

[0020] Optionally, the seal further includes a third sealing portion disposed between the first sealing portion and the second sealing portion. A receiving groove is formed on one side of the cover plate body facing the plate body portion, and the third sealing portion is received in the receiving groove.

[0021] Optionally, the seal is a fluororubber sleeve.

[0022] On the other hand, a battery is provided, which includes a battery housing, a battery cell group, and the battery cover plate as described in any one of the above. The battery cover plate is connected to the battery housing to jointly enclose a closed chamber for accommodating the battery cell group.

[0023] Advantages of the present invention:

[0024] The present invention provides a battery cover plate. By providing a plugging through hole on the first sealing portion of the seal and setting the diameter of the plugging through hole as d, a column portion inserted into the first sealing portion is provided on the pole post and the diameter of the column portion is set as D, and the diameter d of the plugging through hole and the diameter D of the column portion are limited. When the pole post and the cover plate body are connected by riveting, 0.5 mm ≤ (D - d) ≤ 1.75 mm is satisfied. When the pole post and the cover plate body are connected by a non-riveting method, 1.5 mm ≤ (D - d) ≤ 2.5 mm is satisfied. On the one hand, the column portion and the plugging through hole are in interference fit, avoiding the problem of excessive clearance caused by eccentricity after assembly in the case of clearance fit, and having good sealing performance and insulation performance. On the other hand, when the pole post and the cover plate body are connected by riveting, the pole post will experience bulging. However, when connected by a non-riveting method, the pole post will not bulge. Therefore, the interference amount in different connection cases is set specifically to avoid excessive interference amount, which may cause the sealing ring to be overcompressed, thereby ensuring that the seal can still maintain good elasticity and shape even under interference conditions, and extending the service life of the seal.

[0025] The present invention also provides a battery. By applying the above battery cover plate, the product quality is improved due to the improved sealing performance and insulation performance. Description of the Drawings

[0026] Figure 1 is a partial structural cross-sectional view of the battery cover plate provided by the present invention;

[0027] Figure 2 is Figure 1Enlarged view of the structure of part A

[0028] Figure 3 It is a schematic structural diagram of the terminal post in the first combination of the battery cover plate provided by the present invention;

[0029] Figure 4 It is a schematic structural diagram of the seal in the first combination of the battery cover plate provided by the present invention;

[0030] Figure 5 It is a schematic structural diagram of the terminal post in the second combination of the battery cover plate provided by the present invention;

[0031] Figure 6 It is a schematic structural diagram of the seal in the second combination of the battery cover plate provided by the present invention;

[0032] Figure 7 It is a schematic structural diagram of the terminal post in the third combination of the battery cover plate provided by the present invention;

[0033] Figure 8 It is a schematic structural diagram of the seal in the third combination of the battery cover plate provided by the present invention;

[0034] Figure 9 It is a schematic structural diagram of the terminal post in the fourth combination of the battery cover plate provided by the present invention;

[0035] Figure 10 It is a schematic structural diagram of the seal in the fourth combination of the battery cover plate provided by the present invention.

[0036] In the figure:

[0037] 100, the first sealing boss; 200, the second sealing boss; 300, the first sealing groove; 400, the second sealing groove;

[0038] 1, the cover plate body;

[0039] 2, the seal; 21, the first sealing part; 22, the second sealing part; 23, the third sealing part;

[0040] 3, the terminal post; 31, the column body part; 32, the plate body part;

[0041] 4, the upper plastic;

[0042] 5, the lower plastic;

[0043] 6, the connecting piece. Detailed implementation manners

[0044] 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 for explaining the present invention, rather than limiting the present invention. In addition, it should be noted that for the sake of description, only the parts related to the present invention are shown in the drawings, rather than all the structures.

[0045] 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 circumstances.

[0046] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above", and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or 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.

[0047] 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. 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 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 have no special meaning.

[0048] When the seal of the traditional battery cell cover plate and the pole column adopt an interference fit, the seal ring will be excessively squeezed due to excessive interference amount, resulting in wear of the seal ring, thereby reducing the sealing performance and service life of the seal ring. After adopting a clearance fit, the situation of the seal ring being eccentric on one side is likely to occur, which will lead to too large a clearance on one side, causing the electrolyte to leak from the clearance, thereby reducing the sealing performance and insulation.

[0049] Therefore, in order to extend the service life, improve the sealing performance and insulation, this embodiment provides a battery cover plate.

[0050] Such as Figures 1 to 4As shown, the battery cover includes a cover body 1, a seal 2 and a pole 3, the cover body 1 is provided with a mounting through hole, the seal 2 includes a first sealing portion 21 and a second sealing portion 22, the first sealing portion 21 is inserted into the mounting through hole, and is provided with a plug-in through hole, the second sealing portion 22 is provided at one end of the first sealing portion 21 along the first direction, and is continuously provided around the circumferential edge of the first sealing portion 21, the pole 3 includes a column portion 31 and a plate portion 32, the column portion 31 is inserted into the plug-in through hole The plate portion 32 is connected to one end of the column portion 31 along the first direction, and the second sealing portion 22 is sandwiched between the plate portion 32 and the cover body 1. The diameter of the column portion 31 is D, and the diameter of the plug-in through hole is d. When the pole 3 and the cover body 1 are riveted, and 0.5mm≤(Dd)≤1.75mm is satisfied, or when the pole 3 and the cover body 1 are not riveted, and 1.5mm≤(Dd)≤2.5mm is satisfied.

[0051] The battery cover plate is provided with a plug-in through hole on the first sealing portion 21 of the seal 2, and the diameter of the plug-in through hole is set to d, and a column portion 31 plugged with the first sealing portion 21 is provided on the pole 3, and the diameter of the column portion 31 is set to D, and the diameter d of the plug-in through hole and the diameter D of the column portion 31 are limited, so that when the pole 3 and the cover plate body 1 are connected by riveting, 0.5mm≤(Dd)≤1.75mm are satisfied, and when the pole 3 and the cover plate body 1 are connected by non-riveting, 1.5mm≤(Dd)≤2.5mm are satisfied, so that the column 3 is connected to the cover plate body 1 by riveting. The portion 31 and the plug-in through hole are interference fit, which avoids the problem of excessive gap due to eccentricity after assembly caused by clearance fit, and has good sealing and insulation. On the other hand, when the pole 3 and the cover body 1 are connected by riveting, the pole 3 will swell, while when the connection is achieved by non-riveting, the pole 3 will not swell. Therefore, the interference amount in different connection conditions is set specifically to avoid excessive compression of the sealing ring due to excessive interference, thereby ensuring that the seal 2 can maintain good elasticity and shape even in the interference condition, thereby extending the service life of the seal 2.

[0052] In this embodiment, if Figure 2As shown, the battery cover plate further includes an upper plastic 4, a lower plastic 5 and a connecting member 6. The upper plastic 4 and the lower plastic 5 are respectively arranged on both sides of the cover plate body 1 to provide insulation protection for both sides of the cover plate body 1. Among them, the connecting member 6 is used to connect the cover plate body 1 and the pole column 3. When the pole column 3 and the cover plate body 1 are connected by a riveting process, the connecting member 6 is a riveting block. When the pole column 3 and the cover plate body 1 are connected by a non-riveting process such as welding, the connecting member 6 that realizes the connection at this time is a welding block. In addition, when the battery cover plate is a minimalist cover plate formed by a non-riveting process such as stamping, that is, when the pole column 3 and the cover plate body 1 are of an integral structure, it is also applicable to the size limitation of the column body part 31 and the insertion through hole when the pole column 3 and the cover plate body 1 are connected by a non-riveting method.

[0053] Optionally, as Figures 3 to 10 shown, a first sealing groove 300 is formed in one of the column body part 31 and the first sealing part 21, and a first sealing boss 100 inserted into the first sealing groove 300 is provided on the other of the column body part 31 and the first sealing part 21;

[0054] The width dimension of the first sealing boss 100 in the first direction is H1, and the width dimension of the first sealing groove 300 in the first direction is h1. When the pole column 3 and the cover plate body 1 are riveted, and 0.1mm ≤ (H1 - h1) ≤ 0.35mm is satisfied, or when the pole column 3 and the cover plate body 1 are non-riveted, and 0.3mm ≤ (H1 - h1) ≤ 0.5mm is satisfied.

[0055] By providing the first sealing groove 300 and the first sealing boss 100 that are inserted into each other between the column body part 31 and the first sealing part 21, and limiting the relationship between the width dimension H1 of the first sealing boss 100 in the first direction and the width dimension h1 of the first sealing groove 300 in the first direction, the first sealing boss 100 and the first sealing groove 300 are in interference fit in the first direction. Thus, on the one hand, the actual contact area between the column body part 31 and the first sealing part 21 is increased, improving the sealing performance. On the other hand, through the insertion of the first sealing boss 100 and the first sealing groove 300, the connection between the pole column 3 and the seal 2 is made closer, thereby increasing the connection strength and avoiding the dislocation between the pole column 3 and the seal 2 in the first direction when there is pressure inside the battery. In addition, by specifically setting the interference amount of the first sealing boss 100 and the first sealing groove 300 in the first direction under different connection conditions, on the premise that the interference amount of the first sealing boss 100 and the first sealing groove 300 in the first direction can ensure the sealing performance in different connection cases, the deformation amount of the seal 2 is reduced.

[0056] Among them, the difference between the width dimension H1 of the first sealing boss 100 in the first direction and the width dimension h1 of the first sealing groove 300 in the first direction can be any value between 0.3 mm and 0.5 mm or the range between any two values, such as 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, etc.

[0057] Optionally, as Figures 3 to 10 shown, the width dimension of the first sealing boss 100 in the second direction is T1, and the width dimension of the first sealing groove 300 in the second direction is t1. When the pole column 3 and the cover plate body 1 are riveted, and 0.05 mm ≤ (T1 - t1) ≤ 0.2 mm is satisfied, or when the pole column 3 and the cover plate body 1 are not riveted, and 0.15 mm ≤ (T1 - t1) ≤ 0.25 mm is satisfied.

[0058] By arranging the first sealing groove 300 and the first sealing boss 100 that are inserted into each other between the column body part 31 and the first sealing part 21, and limiting the relationship between the width dimension T1 of the first sealing boss 100 in the second direction and the width dimension t1 of the first sealing groove 300 in the second direction, the first sealing boss 100 and the first sealing groove 300 are in interference fit in the second direction. Thus, on the one hand, the actual contact area between the column body part 31 and the first sealing part 21 is increased, improving the sealing performance. On the other hand, through the insertion of the first sealing boss 100 and the first sealing groove 300, the connection between the pole column 3 and the seal 2 is made closer, thereby increasing the connection strength and avoiding the dislocation between the pole column 3 and the seal 2 in the second direction when there is pressure inside the battery. In addition, by specifically setting the interference amount of the first sealing boss 100 and the first sealing groove 300 in the second direction under different connection conditions, on the premise that the interference amount of the first sealing boss 100 and the first sealing groove 300 in the second direction can ensure the sealing performance in different connection cases, the deformation amount of the seal 2 is reduced.

[0059] Among them, the difference between the width dimension T1 of the first sealing boss 100 in the second direction and the width dimension t1 of the first sealing groove 300 in the second direction can be any value between 0.15 mm and 0.25 mm or the range between any two values, such as 0.15 mm, 0.2 mm, 0.25 mm, etc.

[0060] Furthermore, the number of the first sealing grooves 300 and the first sealing bosses 100 arranged between the column body part 31 and the first sealing part 21 can be freely set according to requirements. When multiple groups of the first sealing grooves 300 and the first sealing bosses 100 are arranged between the column body part 31 and the first sealing part 21 in the first direction, the multiple groups of the first sealing grooves 300 and the first sealing bosses 100 are equally spaced between the column body part 31 and the first sealing part 21.

[0061] Optionally, as Figures 3 to 10 shown, one of the plate body portion 32 and the second sealing portion 22 is provided with a second sealing groove 400, and the other of the plate body portion 32 and the second sealing portion 22 is provided with a second sealing boss 200;

[0062] The width dimension of the second sealing boss 200 in the first direction is H2, and the width dimension of the second sealing groove 400 in the first direction is h2. When the pole column 3 and the cover plate body 1 are riveted, 0.05 mm ≤ (H2 - h2) ≤ 0.25 mm is satisfied, or when the pole column 3 and the cover plate body 1 are not riveted, 0.2 mm ≤ (H2 - h2) ≤ 0.3 mm is satisfied.

[0063] By providing a second sealing groove 400 and a second sealing boss 200 that are inserted into each other between the plate body portion 32 and the second sealing portion 22, and limiting the relationship between the width dimension H2 of the second sealing boss 200 in the first direction and the width dimension h2 of the second sealing groove 400 in the first direction, the second sealing boss 200 and the second sealing groove 400 are in interference fit in the first direction. Thus, on the one hand, the actual contact area between the plate body portion 32 and the second sealing portion 22 is increased, improving the sealing performance. On the other hand, through the insertion of the second sealing boss 200 and the second sealing groove 400, the connection between the pole column 3 and the seal 2 is made closer, thereby increasing the connection strength and preventing the pole column 3 and the seal 2 from shifting in the second direction when there is pressure inside the battery. In addition, by specifically setting the interference amount of the second sealing boss 200 and the second sealing groove 400 in the first direction under different connection conditions, on the premise that the interference amount of the second sealing boss 200 and the second sealing groove 400 in the first direction can ensure the sealing performance in different connection cases, the deformation amount of the seal 2 is reduced.

[0064] Wherein, the difference between the width dimension H2 of the second sealing boss 200 in the first direction and the width dimension h2 of the second sealing groove 400 in the first direction can be any value or the range between any two values between 0.2 mm and 0.3 mm, such as 0.2 mm, 0.25 mm, 0.3 mm, etc.

[0065] Optionally, as Figures 3 to 10 shown, the width dimension of the second sealing boss 200 in the second direction is T2, and the width dimension of the second sealing groove 400 in the second direction is t2. When the pole column 3 and the cover plate body 1 are riveted, 0.1 mm ≤ (T2 - t2) ≤ 0.35 mm is satisfied, or when the pole column 3 and the cover plate body 1 are not riveted, 0.3 mm ≤ (T2 - t2) ≤ 0.5 mm is satisfied.

[0066] By providing a second sealing groove 400 and a second sealing boss 200 that are inserted into each other between the plate body portion 32 and the second sealing portion 22, and defining the relationship between the width dimension T2 of the second sealing boss 200 in the second direction and the width dimension t2 of the second sealing groove 400 in the second direction, the second sealing boss 200 and the second sealing groove 400 are in interference fit in the second direction. Thus, on the one hand, the actual contact area between the plate body portion 32 and the second sealing portion 22 is increased, improving the sealing performance. On the other hand, through the insertion of the second sealing boss 200 and the second sealing groove 400, the connection between the pole column 3 and the seal 2 is made more tight, thereby increasing the connection strength and preventing the pole column 3 and the seal 2 from shifting in the second direction when there is pressure inside the battery. In addition, by specifically setting the interference amount of the second sealing boss 200 and the second sealing groove 400 in the second direction under different connection conditions, on the premise that the interference amount of the second sealing boss 200 and the second sealing groove 400 in the second direction can ensure the sealing performance under different connection conditions, the deformation amount of the seal 2 is reduced.

[0067] Wherein, the difference between the width dimension T2 of the second sealing boss 200 in the second direction and the width dimension t2 of the second sealing groove 400 in the second direction can be any value between 0.3 mm and 0.5 mm or the range between any two values, such as 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, etc.

[0068] Furthermore, the number of the second sealing grooves 400 and the second sealing bosses 200 provided between the plate body portion 32 and the second sealing portion 22 can be freely set according to requirements. When multiple sets of the second sealing grooves 400 and the second sealing bosses 200 are provided between the plate body portion 32 and the second sealing portion 22 in the second direction, the multiple sets of the second sealing grooves 400 and the second sealing bosses 200 are equally spaced between the plate body portion 32 and the second sealing portion 22.

[0069] As can be seen from the above, the first sealing groove 300 can be selectively provided on the column body portion 31 or the first sealing portion 21, the first sealing boss 100 can be selectively provided on the column body portion 31 or the first sealing portion 21, the second sealing groove 400 can be selectively provided on the plate body portion 32 or the second sealing portion 22, and the second sealing boss 200 can be selectively provided on the plate body portion 32 or the second sealing portion 22. Therefore, four combinations of the seal 2 and the pole column 3 can be derived, that is, as Figure 3 and Figure 4 shown, the first combination is the pole column 3 with the first sealing boss 100 provided on the column body portion 31 and the second sealing boss 200 provided on the plate body portion 32, and the seal 2 with the first sealing groove 300 provided on the first sealing portion 21 and the second sealing groove 400 provided on the second sealing portion 22; asFigure 5 and Figure 6 As shown in Figure 6 , the second combination is the pole column 3 with a first sealing groove 300 provided on the column part 31 and a second sealing groove 400 provided on the plate part 32, and the seal 2 with a first sealing boss 100 provided on the first sealing part 21 and a second sealing boss 200 provided on the second sealing part 22; as Figure 7 and Figure 8 shown in Figure 7 , the third combination is the pole column 3 with a first sealing boss 100 provided on the column part 31 and a second sealing groove 400 provided on the plate part 32, and the seal 2 with a first sealing groove 300 provided on the first sealing part 21 and a second sealing boss 200 provided on the second sealing part 22; as Figure 9 and Figure 10 shown in Figure 9 , the fourth combination is the pole column 3 with a first sealing groove 300 provided on the column part 31 and a second sealing boss 200 provided on the plate part 32, and the seal 2 with a first sealing boss 100 provided on the first sealing part 21 and a second sealing groove 400 provided on the second sealing part 22.

[0070] In this embodiment, the first combination is adopted. As shown in Figure 3 and Figure 4 , that is, the first sealing groove 300 is opened on the first sealing part 21, the first sealing boss 100 is provided on the column part 31, the second sealing groove 400 is opened on the second sealing part 22, and the second sealing boss 200 is provided on the plate part 32.

[0071] Optionally, as shown in Figure 2 , the seal 2 further includes a third sealing part 23. The third sealing part 23 is arranged between the first sealing part 21 and the second sealing part 22. A receiving groove is opened on one side of the cover plate body 1 facing the plate part 32, and the third sealing part 23 is received in the receiving groove. By providing the third sealing part 23 inserted into the receiving groove on the cover plate body 1 between the first sealing part 21 and the second sealing part 22, on the one hand, it is convenient to position the seal 2 and the cover plate body 1 during assembly, and on the other hand, the contact area between the seal 2 and the cover plate body 1 is increased through the third sealing part 23 and the receiving groove, thereby improving the sealing performance between the seal 2 and the cover plate body 1.

[0072] ​​​​​​Among them, in order to verify the differences between the diameter dimension D of the cylindrical part 31 and the diameter dimension d of the insertion through-hole, the difference between the width dimension H1 of the first sealing boss 100 in the first direction and the width dimension h1 of the first sealing groove 300 in the first direction, the difference between the width dimension T1 of the first sealing boss 100 in the second direction and the width dimension t1 of the first sealing groove 300 in the second direction, the difference between the width dimension H2 of the second sealing boss 200 in the first direction and the width dimension h2 of the second sealing groove 400 in the first direction, and the difference between the width dimension T2 of the second sealing boss 200 in the second direction and the width dimension t2 of the second sealing groove 400 in the second direction, on the sealing performance after assembly, six groups of examples are provided as shown in Table 1, and six groups of comparative examples are provided as shown in Table 2 for verification. Since the pole column 3 will expand after being riveted to the cover plate body 1, the limitation of the interference amount is more stringent. Therefore, the battery cover plate that connects the pole column 3 and the cover plate body 1 by riveting is selected for the test. After assembly, a helium leak detection test is carried out to detect the influence of the above-mentioned dimension limitations on the sealing performance. When the helium leak detection rate value ≤ 1×10 -7 Pa·m 3 / s, the sealing is qualified and meets the requirements. Those significantly higher than this value are determined to be unsealed.

[0073] Table 1

[0074]

[0075] As can be seen from Table 1, when the pole column 3 and the cover plate body 1 are connected by riveting, when the difference between the diameter dimension D of the cylindrical part 31 and the diameter dimension d of the insertion through-hole meets the requirement of 0.5mm ≤ (D - d) ≤ 1.75mm, the difference between the width dimension H1 of the first sealing boss 100 in the first direction and the width dimension h1 of the first sealing groove 300 in the first direction meets the requirement of 0.1mm ≤ (H1 - h1) ≤ 0.35mm, the difference between the width dimension T1 of the first sealing boss 100 in the second direction and the width dimension t1 of the first sealing groove 300 in the second direction meets the requirement of 0.05mm ≤ (T1 - t1) ≤ 0.2mm, the difference between the width dimension H2 of the second sealing boss 200 in the first direction and the width dimension h2 of the second sealing groove 400 in the first direction meets the requirement of 0.05mm ≤ (H2 - h2) ≤ 0.25mm, and the difference between the width dimension T2 of the second sealing boss 200 in the second direction and the width dimension t2 of the second sealing groove 400 in the second direction meets the requirement of 0.1mm ≤ (T2 - t2) ≤ 0.35mm, the helium leak detection rate of the assembled battery cover plate is much lower than the standard value, and the sealing performance is good.

[0076] Table 2

[0077]

[0078] Comparing Comparative Example 1 in Table 2 with Example 1 in Table 1, it can be seen that when the connection between the terminal post 3 and the cover plate body 1 is achieved by riveting, when the difference between the diameter dimension D of the column body portion 31 and the diameter dimension d of the insertion through-hole is less than the minimum value of the range of 0.5 mm ≤ (D - d) ≤ 1.75 mm, at this time, the helium leak detection rate is 7.16×10 -6 Pa·m 3 / s, which is greater than the qualified value of 1×10 - 7 Pa·m 3 / s. At this time, due to the insufficient interference amount between the column body portion 31 and the insertion through-hole, the sealing effect is poor and the leak rate exceeds the standard.

[0079] Comparing Comparative Example 2 in Table 2 with Example 2 in Table 1, it can be seen that when the difference between the width dimension H1 of the first sealing boss 100 in the first direction and the width dimension h1 of the first sealing groove 300 in the first direction is less than the minimum value of the range of 0.1 mm ≤ (H1 - h1) ≤ 0.35 mm, at this time, the helium leak detection rate is 3.12×10 -8 Pa·m 3 / s, which is greater than the helium leak detection rate value of 2.06×10 -8 Pa·m 3 / s of Example 2. From this, it can be known that due to the insufficient interference amount between the first sealing boss 100 and the first sealing groove 300 in the first direction, the sealing performance is weakened.

[0080] Comparing Comparative Example 3 in Table 2 with Example 3 in Table 1, it can be seen that when the difference between the width dimension T1 of the first sealing boss 100 in the second direction and the width dimension t1 of the first sealing groove 300 in the second direction is less than the minimum value of the range of 0.05 mm ≤ (T1 - t1) ≤ 0.2 mm, at this time, the helium leak detection rate is 2.03×10 -8 Pa·m 3 / s, which is greater than the helium leak detection rate value of 1.97×10 -8 Pa·m 3 / s of Example 3. From this, it can be known that due to the insufficient interference amount between the first sealing boss 100 and the first sealing groove 300 in the second direction, the sealing performance is weakened.

[0081] Comparing Comparative Example 4 in Table 2 with Example 4 in Table 1, it can be seen that when the difference between the width dimension H2 of the second sealing boss 200 in the first direction and the width dimension h2 of the second sealing groove 400 in the first direction is less than the minimum value of the range of 0.05 mm ≤ (H2 - h2) ≤ 0.25 mm, at this time, the helium leak detection rate is 3.78×10 -8 Pa·m 3 / s is greater than the helium leak detection rate value of 3.05×10 -8 Pa·m 3 / s. From this, it can be seen that due to the insufficient interference amount of the second sealing boss 200 and the second sealing groove 400 in the first direction, the sealing performance is weakened.

[0082] From the comparison between Comparative Example 5 in Table 2 and Example 5 in Table 1, it can be seen that when the difference between the width dimension T2 of the second sealing boss 200 in the second direction and the width dimension t2 of the second sealing groove 400 in the second direction is less than the minimum value of the range 0.1mm ≤ (T2 - t2) ≤ 0.35mm, the helium leak detection rate at this time is 3.19×10 -8 Pa·m 3 / s is greater than the helium leak detection rate value of 2.42×10 -8 Pa·m 3 / s. From this, it can be seen that due to the insufficient interference amount of the second sealing boss 200 and the second sealing groove 400 in the second direction, the sealing performance is weakened.

[0083] From the comparison between Comparative Example 6 in Table 2 and Example 6 in Table 1, it can be seen that when the connection between the terminal post 3 and the cover plate body 1 is achieved by riveting, when the difference between the diameter dimension D of the column part 31 and the diameter dimension d of the insertion through hole is greater than the maximum value of the range 0.5mm ≤ (D - d) ≤ 1.75mm, the helium leak detection rate at this time is 6.72×10 -5 Pa·m 3 / s is much greater than the qualified value of 1×10 -7 Pa·m 3 / s. At this time, due to the excessive interference amount between the column part 31 and the insertion through hole, after the assembly is completed by riveting, the terminal post 3 bulges, overly compresses the seal 2 provided with the insertion through hole, resulting in excessive deformation of the seal 2 and finally breakage, leading to seal failure and making the helium leak detection rate value far exceed the qualified standard.

[0084] In this embodiment, a battery is further provided. The battery includes a battery housing, a battery cell group, and the above-mentioned battery cover plate. The battery cover plate is connected to the battery housing, and together they enclose a closed chamber for accommodating the battery cell group. By applying the above-mentioned battery cover plate, the product quality is improved due to the improved sealing performance and insulation performance.

[0085] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A battery cover, characterized in that: The battery cover comprises: A cover plate body, wherein the cover plate body is provided with a mounting through hole; A sealing member, the sealing member comprising a first sealing portion and a second sealing portion, the first sealing portion being inserted into the mounting through hole and having an inserting through hole, the second sealing portion being arranged at one end of the first sealing portion along a first direction and being continuously arranged around a circumferential edge of the first sealing portion; A pole, the pole comprising a column portion and a plate portion, the column portion is inserted into the plug-in through hole and insulated and connected to the cover body, the plate portion is connected to one end of the column portion along the first direction, and the second sealing portion is sandwiched between the plate portion and the cover body; The diameter dimension of the column part is D, and the diameter dimension of the plug-in through hole is d. When the pole and the cover body are riveted, 0.5mm≤(Dd)≤1.75mm is satisfied, or when the pole and the cover body are not riveted, 1.5mm≤(Dd)≤2.5mm is satisfied.

2. The battery cover according to claim 1, characterized in that: One of the column part and the first sealing part is provided with a first sealing groove, and the other of the column part and the first sealing part is provided with a first sealing boss plugged into the first sealing groove; The width dimension of the first sealing boss along the first direction is H1, and the width dimension of the first sealing groove along the first direction is h1. When the pole and the cover plate body are riveted, 0.1mm≤(H1-h1)≤0.35mm is satisfied, or when the pole and the cover plate body are not riveted, 0.3mm≤(H1-h1)≤0.5mm is satisfied.

3. The battery cover according to claim 2, characterized in that: The width dimension of the first sealing boss along the second direction is T1, and the width dimension of the first sealing groove along the second direction is t1. When the pole and the cover plate body are riveted, and 0.05mm≤(T1-t1)≤0.2mm is satisfied, or when the pole and the cover plate body are not riveted, and 0.15mm≤(T1-t1)≤0.25mm is satisfied.

4. The battery cover according to claim 1, characterized in that: One of the plate body and the second sealing portion is provided with a second sealing groove, and the other of the plate body and the second sealing portion is provided with a second sealing boss; The width dimension of the second sealing boss along the first direction is H2, and the width dimension of the second sealing groove along the first direction is h2. When the pole and the cover plate body are riveted, and 0.05mm≤(H2-h2)≤0.25mm is satisfied, or when the pole and the cover plate body are not riveted, and 0.2mm≤(H2-h2)≤0.3mm is satisfied.

5. The battery cover according to claim 4, characterized in that: The width dimension of the second sealing boss along the second direction is T2, and the width dimension of the second sealing groove along the second direction is t2. When the pole and the cover plate body are riveted, 0.1mm≤(T2-t2)≤0.35mm is satisfied, or when the pole and the cover plate body are not riveted, 0.3mm≤(T2-t2)≤0.5mm is satisfied.

6. The battery cover according to claim 2, characterized in that: A plurality of groups of the first sealing grooves and the first sealing bosses are arranged between the column portion and the first sealing portion along the first direction and are distributed at equal intervals.

7. The battery cover according to claim 4, characterized in that: A plurality of groups of the second sealing grooves and the second sealing bosses are arranged between the plate body and the second sealing portion along the second direction and are distributed at equal intervals.

8. The battery cover according to claim 1, characterized in that: The sealing member further includes a third sealing portion, which is disposed between the first sealing portion and the second sealing portion. A receiving groove is formed on one side of the cover body facing the plate body, and the third sealing portion is received in the receiving groove.

9. The battery cover according to claim 1, characterized in that: The sealing element is a fluororubber sleeve.

10. A battery, characterized in that The battery comprises a battery casing, a pole group and a battery cover as claimed in any one of claims 1 to 9, wherein the battery cover is connected to the battery casing and together forms a closed chamber for accommodating the pole group.

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