Cover plate assembly

Abstract

The invention discloses a cover plate assembly, and belongs to the technical field of batteries, the cover plate assembly comprises: a top cover, the top cover comprises a main body part and a crimping part, the main body part is provided with a first through hole, the crimping part is connected to one side of the main body part along the thickness direction and is arranged around the first through hole, and the crimping part is provided with a second through hole communicated with the first through hole; the pole penetrates through the second through hole, the crimping part is arranged around the pole, and at least part of the crimping part is located on one side of the pole in the thickness direction. The crimping part is abutted against one side of the pole along the thickness direction, and the abutting part is abutted against the other side of the pole along the thickness direction, so that the pole is fixedly mounted, the pole does not need to be riveted on the main body part through a riveting block, the pole can occupy more positions on the main body part, the overcurrent area of the pole can be set to be larger, and the service life of the pole is prolonged. Therefore, the charging and discharging requirements of batteries with different specifications are met, and the application range of the pole is enlarged.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and in particular relates to a cover plate assembly. Background Art

[0002] The battery cover assembly refers to the assembly used to seal the top or bottom of the battery. It is usually made of metal or plastic material. The battery pole is generally riveted to the battery cover by a rivet block to fix the pole. However, for batteries of different specifications, corresponding poles are often required to be designed, so that the poles cannot meet the charging and discharging requirements of batteries of different specifications. Summary of the invention

[0003] Purpose of the invention: An embodiment of the present application provides a cover plate assembly, which aims to overcome the technical problem that the pole cannot meet the charging and discharging requirements of batteries of different specifications.

[0004] Technical solution: A cover plate assembly described in an embodiment of the present application includes:

[0005] A top cover, the top cover comprising a main body and a crimping portion, the main body having a first through hole, the crimping portion being connected to one side of the main body along a thickness direction and arranged around the first through hole, and the crimping portion having a second through hole communicating with the first through hole;

[0006] A pole, passing through the second through hole, the crimping portion is arranged around the pole, and at least a part of the crimping portion is located on one side of the pole along the thickness direction;

[0007] An abutment piece, at least partially located on the other side of the pole along the thickness direction and connected to the main body, wherein a portion of the pole is clamped between the abutment piece and the crimping portion along the thickness direction;

[0008] The cover plate assembly meets the following requirements: 0.3mm≤A≤5mm;

[0009] Wherein, A is the distance from the inner contour of the orthographic projection of the crimping portion on the pole along the thickness direction to the outer contour of the pole.

[0010] In some embodiments, the cover plate assembly further comprises:

[0011] The first insulating member is covered on the crimping portion and is arranged around the pole. The crimping portion abuts against one side of the pole along the thickness direction through the first insulating member.

[0012] In some embodiments, the first insulating member includes a first body and a first anti-rotation portion, the first body is covered on the crimping portion and is disposed around the pole, and the first anti-rotation portion is connected to a side of the first body facing the pole;

[0013] The pole includes a second body and a second anti-rotation portion, the second body is inserted into the second through hole and connected to the first body, and the second anti-rotation portion is connected to the outer periphery of the second body and is cooperatively connected to the first anti-rotation portion.

[0014] In some embodiments, the abutment member comprises:

[0015] a connecting portion, at least partially located in the first through hole and connected to the main body;

[0016] The sealing portion is at least partially located on the other side of the pole along the thickness direction and is connected between the connecting portion and the pole.

[0017] In some embodiments, the main body has a mounting groove connected to the first through hole, and the mounting groove is arranged on a side of the main body away from the crimping portion; at least part of the connecting portion is embedded in the mounting groove and connected to the inner wall of the mounting groove; the cover plate assembly satisfies: 1mm≤D≤5mm;

[0018] Wherein, D is the distance from the outer contour of the orthographic projection of the first through hole on the connecting portion along the thickness direction to the outer contour of the connecting portion.

[0019] In some embodiments, the connecting portion comprises:

[0020] A first lap ring, at least partially embedded in the mounting groove and connected to an inner wall of the mounting groove;

[0021] A second lap ring connected to a side of the first lap ring facing away from the pole;

[0022] A support seat is connected to a side of the second lap ring facing away from the first lap ring. The support seat, the first lap ring and the second lap ring together form a positioning groove. At least a portion of the sealing portion is located in the positioning groove.

[0023] In some embodiments, the thickness of the main body is T, the thickness of the first lap ring is C1, satisfying: C1≥0.5mm, and the thickness of the support seat is C2, satisfying C2≤T.

[0024] In some embodiments, the sealing portion comprises:

[0025] A positioning ring, located in the positioning groove and connected to the first lap ring, the second lap ring and the support seat respectively;

[0026] A contact ring is located outside the positioning groove and connected to one side of the positioning ring facing the pole, and the contact ring abuts against the other side of the pole along the thickness direction.

[0027] In some embodiments, the cover plate assembly satisfies: 0.7 mm ≤ E ≤ 5 mm;

[0028] Wherein, E is the distance between the outer contour and the inner contour of the orthographic projection of the sealing portion on the pole along the thickness direction.

[0029] In some embodiments, the thickness of the main body is T, and the crimping portion includes a connecting ring and a pressing ring, the connecting ring is connected to the main body and is arranged around the first through hole, the pressing ring is connected to the side of the connecting ring away from the main body and is arranged around the pole, and at least part of the pressing ring is located on one side of the pole along the thickness direction; the thickness of the pressing ring is B, satisfying: 0.5mm≤B≤0.6T.

[0030] Beneficial effect: The cover plate assembly of the embodiment of the present application includes: a top cover, the top cover includes a main body and a crimping part, the main body has a first through hole, the crimping part is connected to one side of the main body along the thickness direction, and is arranged around the first through hole, and the crimping part has a second through hole connected to the first through hole; a pole, which is passed through the second through hole, and the crimping part is arranged around the pole, and at least part of the crimping part is located on one side of the pole along the thickness direction; an abutment, which is at least partly located on the other side of the pole along the thickness direction, and is connected to the main body, and along the thickness direction, part of the pole is clamped between the abutment and the crimping part; the cover plate assembly satisfies: 0.3mm≤A≤5mm; wherein A is the distance from the inner contour of the positive projection of the crimping part on the pole along the thickness direction to the outer contour of the pole. The crimping portion abuts against one side of the pole along the thickness direction, and the abutting piece abuts against the other side of the pole along the thickness direction, thereby achieving fixed installation of the pole. There is no need to rivet the pole to the main body through a rivet block, so that the pole can occupy more position on the main body, and the current flow area of ​​the pole can be set larger, thereby meeting the charging and discharging requirements of batteries of different specifications and increasing the application range of the pole. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 This is a front cross-sectional view of the cover plate assembly of an embodiment of the present application;

[0033] Figure 2This is a cross-sectional view of the connection between the pole and the top cover of the embodiment of the present application;

[0034] Figure 3 This is a schematic structural diagram of the connection between the crimping portion, the first insulating member and the main body of the embodiment of the present application;

[0035] Figure 4 It is a front cross-sectional view of the main body of the embodiment of the present application;

[0036] Figure 5 An exploded view of a cover plate assembly according to an embodiment of the present application;

[0037] Figure 6 A three-dimensional diagram of a first insulating member according to an embodiment of the present application;

[0038] Figure 7 A three-dimensional diagram of a pole according to an embodiment of the present application;

[0039] Figure 8 This is a schematic diagram of the structure of a connection portion in one form of an embodiment of the present application;

[0040] Fig. 9 This is a schematic structural diagram of another form of a connecting portion of an embodiment of the present application;

[0041] Fig.10 This is a schematic structural diagram of a sealing portion in one form of an embodiment of the present application;

[0042] Fig.11 This is a schematic structural diagram of another form of a sealing portion in an embodiment of the present application;

[0043] Fig.12 This is a schematic structural diagram of a sealing portion in a third form of an embodiment of the present application;

[0044] Figure markings: 10-top cover; 11-main body; 111-first through hole; 112-installing groove; 12-crimping portion; 121-second through hole; 122-connecting ring; 123-pressing ring; 20-pole; 21-second body; 22-second anti-rotation portion; 30-abutment; 31-connecting portion; 311-first lap ring; 312-second lap ring; 313-support seat; 314-positioning groove; 32-sealing portion; 321-positioning ring; 322-contact ring; 40-first insulating member; 41-first body; 42-first anti-rotation portion; 50-second insulating member; 51-clamping portion; X-thickness direction. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0046] In the description of the present application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, "plurality" means two or more, and at least one means one, two or more, unless otherwise clearly and specifically defined.

[0047] The cover assembly of the battery refers to the assembly used to seal the top or bottom of the battery to ensure that the active substances and electrolytes inside the battery will not leak or foreign substances will not enter the battery. It is usually made of metal or plastic materials. The battery pole is generally riveted to the battery cover by a rivet block to fix the pole. The rivet block occupies a large space in the length and width directions of the cover, that is, the cross-sectional area of ​​the cover is certain, and the cross-sectional area of ​​the rivet block is large, so that the cross-sectional area of ​​the pole (that is, the flow area) is limited. For batteries of different specifications, it is often necessary to design different poles that meet the corresponding flow capacity, that is, the flow area of ​​the pole must meet the requirements, so the current pole cannot meet the charging and discharging needs of batteries of different specifications.

[0048] In view of this, an embodiment of the present application provides a cover assembly to overcome at least one of the above-mentioned technical problems.

[0049] See also Figure 1 , Figure 2 , Figure 3 and Figure 5 In the embodiment of the present application, the cover plate assembly includes: a top cover 10, a pole 20, and an abutment member 30.

[0050] The top cover 10 includes a main body 11 and a crimping part 12. The main body 11 has a first through hole 111. The crimping part 12 is connected to one side of the main body 11 along the thickness direction X and is arranged around the first through hole 111. The crimping part 12 has a second through hole 121 connected to the first through hole 111. The pole 20 is passed through the second through hole 121. The crimping part 12 is arranged around the pole 20. At least part of the crimping part 12 is located on one side of the pole 20 along the thickness direction X and is indirectly abutted against the pole 20. The abutting member 30 is at least partially located on the other side of the pole 20 along the thickness direction X and is connected to the main body 11. Along the thickness direction X, part of the pole 20 is clamped between the abutting member 30 and the crimping part 12. It can be understood that the top cover 10 of the battery is connected to the battery shell through the main body 11 to protect the internal structure of the battery shell. The main body 11 of the top cover 10 has a first through hole 111, and the crimping portion 12 has a second through hole 121. The first through hole 111 and the second through hole 121 are used for installing the pole 20. When installing the pole 20, the second through hole 121 can be penetrated and embedded in the first through hole 111, or can be only embedded in the second through hole 121. The crimping portion 12 abuts against one side of the pole 20 along the thickness direction X, thereby preventing the pole 20 from moving along one side of the thickness direction X. The abutment 30 abuts against the other side of the pole 20 along the thickness direction, preventing the pole 20 from moving along the other side of the thickness direction X, thereby preventing the pole 20 from moving along the thickness direction X, and limiting the pole 20, thereby achieving fixed installation of the pole. There is no need to rivet the pole 20 to the main body 11 through a riveting block, so that the pole 20 can occupy more space on the main body 11, and the flow area of ​​the pole 20 can be set larger, thereby meeting the charging and discharging requirements of batteries of different specifications and increasing the applicable scope of the pole 20. This setting method standardizes the pole 20, and by setting a pole 20 with a larger flow area, the charging and discharging requirements of multiple batteries of different specifications can be met. There is no need to produce a special pole 20 for each specification of battery, which also reduces the cost of battery production to a certain extent.

[0051] The cover plate assembly satisfies: 0.3mm≤A≤5mm; wherein A is the distance from the inner contour of the orthographic projection of the crimping portion 12 on the pole 20 along the thickness direction X to the outer contour of the pole 20. The distance from the inner contour of the orthographic projection of the crimping portion 12 on the pole 20 along the thickness direction X to the outer contour of the pole 20 is in the range of 0.3mm to 5mm, and A can be any value among 0.3mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm or a range value between any two values. The distance from the inner contour of the orthographic projection of the crimping portion 12 on the pole 20 along the thickness direction X to the outer contour of the pole 20 can be measured by tools such as a tape measure, a laser rangefinder, and a digital measuring instrument. The cover plate assembly is tested by adding a thrust along the thickness direction X to the cover plate assembly, the thrust being 1500N. On the premise of meeting the battery sealing requirements, observe whether the first insulating member 40 on the cover plate assembly is damaged. The test results of the embodiment and the comparative example are shown in the following table:

[0052]

[0053] As can be seen from the above table, when the distance A from the inner contour of the positive projection of the crimping portion 12 on the pole 20 along the thickness direction X to the outer contour of the pole 20 is in the range of 0.3mm to 5mm, the first insulating member 40 will not be damaged when the cover assembly is subjected to a thrust test, ensuring good integrity. When A is less than 0.3mm, cracks will appear on the first insulating member 40 during the test. When A is greater than 5mm, the cross-sectional area of ​​the pole 20 will be designed to be smaller, which will affect the current carrying capacity of the pole 20 and is not recommended.

[0054] See also Figure 1 , Figure 2 and Figure 3 In combination with the above embodiments, in some embodiments, the cover plate assembly further includes a first insulating member 40. The first insulating member 40 is coated on the crimping portion 12 and is arranged around the pole 20. The crimping portion 12 is abutted against one side of the pole 20 along the thickness direction X through the first insulating member 40. It can be understood that the first insulating member 40 is coated on the crimping portion 12, and the crimping portion 12 is provided with one or more through holes in the radial direction. The first insulating member 40 can be connected to the crimping portion 12 by injection molding. The through holes on the crimping portion 12 facilitate the passage of molten material, thereby facilitating the molten material to wrap the crimping portion 12. After the molten material is cooled and formed, the first insulating member 40 can be formed. The through holes facilitate the processing and molding of the first insulating member 40. The crimping portion 12 is abutted against one side of the pole 20 along the thickness direction X through the first insulating member 40. The first insulating member 40 is arranged around the pole 20, which can play a certain insulating role on the pole 20 to avoid the phenomenon of short circuit.

[0055] See also Figure 5 , Figure 6 and Figure 7 In combination with the above embodiments, in some embodiments, the first insulating member 40 includes a first body 41 and a first stopper 42, the first body 41 is covered on the crimping portion 12 and is arranged around the pole 20, and the first stopper 42 is connected to the side of the first body 41 facing the pole 20. The pole 20 includes a second body 21 and a second stopper 22, the second body 21 is penetrated through the second through hole 121 and connected to the first body 41, and the second stopper 22 is connected to the outer periphery of the second body 21 and is matched with the first stopper 42. It can be understood that the inner side of the first body 41 of the first insulating member 40 can be an arcuate surface, and the first stop portion 42 of the first insulating member 40 is set toward the pole 20. The first stop portion 42 can be a plane or a concave-convex structure. The outer periphery of the second body 21 on the pole 20 is an arcuate surface. The second stop portion 22 on the pole 20 can be set toward the first insulating member 40. The second stop portion 22 can be a plane that fits with the first stop portion 42, and the two planes are matched and connected. If the first stop portion 42 is a concave-convex structure, the second stop portion 22 can be another concave-convex structure, and the two concave-convex structures can be matched and connected, thereby preventing the pole 20 from rotating after the second through hole 121 is penetrated, thereby ensuring the stability of the pole 20 during the installation process.

[0056] See also Figure 1 and Figure 2 In combination with the above embodiments, in some embodiments, the abutment member 30 includes a connecting portion 31 and a sealing portion 32 .

[0057] The connecting portion 31 is at least partially located in the first through hole 111 and is connected to the main body 11. The sealing portion 32 is at least partially located on the other side of the pole 20 along the thickness direction X, and is connected between the connecting portion 31 and the pole 20. It can be understood that the connecting portion 31 can be welded to the main body 11 to ensure the stability of the connecting portion 31. The sealing portion 32 is connected between the connecting portion 31 and the pole 20, and the connecting portion 31 supports the sealing portion 32, so that the sealing portion 32 at least partially abuts against the other side of the pole 20 along the thickness direction X, providing sufficient support for the pole 20, thereby preventing the pole 20 from falling off and ensuring the stability of the installation of the pole 20.

[0058] See also Figure 1 , Figure 2 and Figure 3In combination with the above embodiments, in some embodiments, the main body 11 has a mounting groove 112 connected to the first through hole 111, and the mounting groove 112 is arranged on the side of the main body 11 away from the crimping portion 12. At least part of the connecting portion 31 is embedded in the mounting groove 112 and connected to the inner wall of the mounting groove 112. It can be understood that part of the connecting portion 31 is embedded in the mounting groove 112 and welded to the inner wall of the mounting groove 112, and the welding position is set between the outer contour of the connecting portion 31 and the inner wall of the mounting groove 112. The outer diameter of the connecting portion 31 is set larger than the outer diameter of the first through hole 111, so that the contour of the welding position between the connecting portion 31 and the inner wall of the mounting groove 112 is larger, thereby facilitating the welding of the connecting portion 31 and reducing the difficulty of welding.

[0059] The cover plate assembly satisfies: 1mm≤D≤5mm; wherein D is the distance from the outer contour of the orthographic projection of the first through hole 111 on the connecting portion 31 along the thickness direction X to the outer contour of the connecting portion 31. D can be any value among 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, or a range value between any two values. The value of D can be measured by tools such as a tape measure, a laser rangefinder, and a digital measuring instrument. Welding tests were conducted on multiple groups of cover plate assemblies. The periphery of the connecting portion 31 was welded to the main body 11, and the damage of the sealing portion 32 was observed. The results are shown in the following table:

[0060]

[0061]

[0062] It can be seen from the above table that when D satisfies: 1mm≤D≤5mm, after removing the cover assembly, the sealing part 32 is not burned and can be used normally, ensuring the sealing performance of the structure. When D is less than 1mm, after removing the cover assembly, the sealing part 32 is burned and the sealing performance of the structure cannot be guaranteed. When D is greater than 5mm, the size of the connection part 31 and the main body 11 for welding is large, which will affect the design of the size of the pole 20, which is not conducive to the improvement of the current carrying capacity of the pole 20, and is not recommended.

[0063] See also Figure 1 , Figure 2 , Figure 8 and Fig. 9 In combination with the above embodiments, in some embodiments, the connecting portion 31 includes a first lap ring 311 , a second lap ring 312 and a supporting seat 313 .

[0064] The first lap ring 311 is at least partially embedded in the mounting groove 112 and connected to the inner wall of the mounting groove 112. The second lap ring 312 is connected to the side of the first lap ring 311 away from the pole 20. The support seat 313 is connected to the side of the second lap ring 312 away from the first lap ring 311, and the support seat 313, the first lap ring 311 and the second lap ring 312 are surrounded to form a positioning groove 314, and at least a part of the sealing portion 32 is located in the positioning groove 314. It can be understood that at least a part of the first lap ring 311 is embedded in the mounting groove 112, and the first lap ring 311 is welded to the inner wall of the mounting groove 112. At the same time, the support seat 313, the first lap ring 311 and the second lap ring 312 enclose a positioning groove 314, and at least part of the sealing part 32 is located in the positioning groove 314. The positioning groove 314 can play a certain positioning role in the installation of the sealing part 32, so that the sealing part 32 is in the correct position during installation to avoid its position from being offset. A structure that matches the positioning groove 314 can be provided on the sealing part 32, so as to facilitate the placement of the sealing part 32 inside the positioning groove 314. When the connecting part 31 and the sealing part 32 are assembled, the sealing part 32 can be connected with the positioning groove 314, and then the connecting part 31 is welded to the inner wall of the installation groove 112, so as to realize the assembly of the connecting part 31 and the sealing part 32.

[0065] See also Figure 1 , Figure 2 , Figure 8 and Fig. 9 In combination with the above embodiments, in some embodiments, the thickness of the main body 11 is T, the thickness of the first lap ring 311 is C1, satisfying: C1≥0.5mm, and the thickness of the support seat 313 is C2, satisfying C2≤T.

[0066] See also Fig.10 , Fig.11 and Fig.12 In combination with the above embodiments, in some embodiments, the sealing portion 32 includes a positioning ring 321 and a contact ring 322 .

[0067] The positioning ring 321 is located in the positioning groove 314 and is connected to the first lap ring 311, the second lap ring 312 and the support seat 313 respectively. The contact ring 322 is located outside the positioning groove 314 and is connected to the side of the positioning ring 321 facing the pole 20, and the contact ring 322 abuts against the other side of the pole 20 along the thickness direction X. It can be understood that when the sealing part 32 is assembled and connected with the connecting part 31, the positioning ring 321 on the sealing part 32 can be embedded in the positioning groove 314, so as to complete the preliminary connection between the sealing part 32 and the connecting part 31. The cooperation between the positioning ring 321 and the positioning groove 314 can avoid the mutual misalignment of the sealing part 32 and the connecting part 31 when they are assembled on the top cover 10 to a certain extent. Then, the sealing part 32 connected to the positioning ring 321 abuts against the pole 20, so as to limit the pole 20 to a certain extent in the thickness direction X. At the same time, it plays a certain sealing role, preventing external substances from entering the battery and preventing liquid or gas inside the battery from leaking out.

[0068] See also Figure 1 and Figure 2 In combination with the above embodiments, in some embodiments, the cover assembly satisfies: 0.7mm≤E≤5mm; wherein E is the value between the outer contour and the inner contour of the positive projection of the sealing portion 32 on the pole 20 along the thickness direction X. E can be any value among 0.7mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, or a range value between any two values. The value of E can be measured by tools such as a tape measure, a laser rangefinder, and a digital measuring instrument. A sealing test is performed on the cover assembly, the two sides of the cover assembly are isolated, a certain pressure of gas is set on one side of the cover assembly, and the other side of the cover assembly is tested for corresponding gas leakage. The results are as follows:

[0069]

[0070]

[0071] It can be seen from the above table that when E satisfies: 0.7mm≤E≤5mm, the cover assembly is subjected to a sealing test, and no corresponding gas leakage is found on the other side of the cover assembly, indicating that no gas passes through the second through hole 121, and the sealing portion 32 can ensure the sealing performance of the structure. When E is less than 0.7mm, the corresponding gas leakage is found on the other side of the cover assembly, and the sealing portion 32 cannot ensure the sealing performance of the structure. When E is greater than 5mm, the design dimensions of the sealing portion 32 and the pole 20 are large, which will affect the design of the dimensions of the pole 20 or the cover assembly, increase the cost, and is not recommended.

[0072] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 In combination with the above embodiments, in some embodiments, the thickness of the main body 11 is T, the crimping portion 12 includes a connecting ring 122 and a pressing ring 123, the connecting ring 122 is connected to the main body 11, and is arranged around the first through hole 111, the pressing ring 123 is connected to the side of the connecting ring 122 away from the main body 11, and is arranged around the pole 20, at least part of the pressing ring 123 is located on one side of the pole 20 along the thickness direction X, and the pressing ring 123 abuts against one side of the pole 20 along the thickness direction X through the first insulating member 40; the thickness of the pressing ring 123 is B, which satisfies: 0.5mm≤B≤0.6T. If the value of T is 2mm, B satisfies: 0.5mm≤B≤1.2mm, and B can be any value of 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, or a range value between any two values. The value of B can be measured by tools such as tape measure, laser rangefinder, digital measuring instrument, etc. Add a thrust of 1500N along the thickness direction X to the cover assembly and observe whether the crimping part 12 on the cover assembly is deformed. The test results are as follows:

[0073]

[0074]

[0075] It can be seen from the above table that when T is 2mm, B satisfies: 0.5mm≤B≤1.2mm. When the cover assembly is subjected to a thrust test, the crimping portion 12 does not deform after being subjected to force, and has good strength. When B is less than 0.5mm, the crimping portion 12 deforms after being subjected to force, and has low strength. When B is greater than 1.2mm, the wall thickness of the crimping portion 12 is large, making it difficult to flanging the crimping portion 12, that is, the formation of the pressure ring 123 is more difficult, and cracks are prone to occur, so it is not recommended for use.

[0076] See also Figure 1 , Figure 2 , Figure 4 and Figure 5 In combination with the above embodiments, in some embodiments, the cover plate assembly further includes a second insulating member 50, which is located on the side of the main body 11 away from the crimping portion 12, and includes a clamping portion 51 arranged toward the main body 11, the clamping portion 51 is arranged in the hole groove structure inside the connecting portion 31, and a portion thereof extends in a direction away from the center line, and the portion is clamped and connected between the pole 20 and the connecting portion 31, thereby fixing the clamping portion 51, and thus connecting the second insulating member 50 to the main body 11. Through this connection method, the second insulating member 50 can be quickly assembled with the main body 11, and there is no need to connect them by injection molding, which improves the efficiency of the cover plate assembly assembly and reduces the processing cost.

[0077] A single cell battery comprises a shell, an electrode assembly and a cover assembly of any one of the above. The shell has a receiving cavity. The electrode assembly is arranged in the receiving cavity. The cover assembly covers the receiving cavity and is connected to the shell. A single cell battery is an independent battery unit that can generate electrical energy for use in electronic equipment or systems. A single cell battery usually has an electrode assembly including a positive electrode, a negative electrode, an electrolyte and a diaphragm, and also comprises a shell, the shell has a receiving cavity, and the electrode assembly is arranged in the receiving cavity. The single cell battery also comprises a cover assembly, which is connected to the shell and covers the receiving cavity, so that the structure inside the receiving cavity has a good working environment and is not affected by external factors.

[0078] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0079] The cover plate assembly and single cell provided in the embodiments of the present application are introduced in detail above, and the principles and implementation methods of the present application are explained by using specific examples. The description of the above embodiments is only used to help understand the technical solution and its core idea of ​​the present application. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the present application.

Claims

1. A cover plate assembly, characterized in that: include: A top cover, the top cover comprising a main body and a crimping portion, the main body having a first through hole, the crimping portion being connected to one side of the main body along a thickness direction and arranged around the first through hole, and the crimping portion having a second through hole communicating with the first through hole; A pole, passing through the second through hole, the crimping portion is arranged around the pole, and at least a part of the crimping portion is located on one side of the pole along the thickness direction; An abutment piece, at least partially located on the other side of the pole along the thickness direction and connected to the main body, wherein a portion of the pole is clamped between the abutment piece and the crimping portion along the thickness direction; The cover plate assembly meets the following requirements: 0.3mm≤A≤5mm; Wherein, A is the distance from the inner contour of the orthographic projection of the crimping portion on the pole along the thickness direction to the outer contour of the pole.

2. The cover plate assembly according to claim 1, characterized in that: The cover plate assembly also includes: The first insulating member is covered on the crimping portion and is arranged around the pole. The crimping portion abuts against one side of the pole along the thickness direction through the first insulating member.

3. The cover plate assembly according to claim 2, characterized in that: The first insulating member includes a first body and a first anti-rotation portion, the first body covers the crimping portion and is arranged around the pole, and the first anti-rotation portion is connected to a side of the first body facing the pole; The pole includes a second body and a second anti-rotation portion, the second body is inserted into the second through hole and connected to the first body, and the second anti-rotation portion is connected to the outer periphery of the second body and is cooperatively connected to the first anti-rotation portion.

4. The cover plate assembly according to claim 1, characterized in that: The abutment member comprises: a connecting portion, at least partially located in the first through hole and connected to the main body; The sealing portion is at least partially located on the other side of the pole along the thickness direction and is connected between the connecting portion and the pole.

5. The cover plate assembly according to claim 4, characterized in that: The main body has a mounting groove connected to the first through hole, and the mounting groove is arranged on a side of the main body away from the crimping portion; at least a portion of the connecting portion is embedded in the mounting groove and connected to the inner wall of the mounting groove; the cover plate assembly satisfies: 1mm≤D≤5mm; Wherein, D is the distance from the outer contour of the orthographic projection of the first through hole on the connecting portion along the thickness direction to the outer contour of the connecting portion.

6. The cover plate assembly according to claim 5, characterized in that: The connecting portion comprises: A first lap ring, at least partially embedded in the mounting groove and connected to an inner wall of the mounting groove; A second lap ring connected to a side of the first lap ring facing away from the pole; A support seat is connected to a side of the second lap ring facing away from the first lap ring. The support seat, the first lap ring and the second lap ring together form a positioning groove. At least a portion of the sealing portion is located in the positioning groove.

7. The cover plate assembly according to claim 6, characterized in that: The thickness of the main body is T, the thickness of the first lap ring is C1, which satisfies: C1≥0.5mm, and the thickness of the support seat is C2, which satisfies C2≤T.

8. The cover plate assembly according to claim 6, characterized in that: The sealing portion comprises: A positioning ring, located in the positioning groove and connected to the first lap ring, the second lap ring and the support seat respectively; A contact ring is located outside the positioning groove and connected to one side of the positioning ring facing the pole, and the contact ring abuts against the other side of the pole along the thickness direction.

9. The cover plate assembly according to claim 4, characterized in that: The cover plate assembly meets the following requirements: 0.7 mm ≤ E ≤ 5 mm; Wherein, E is the distance between the outer contour and the inner contour of the orthographic projection of the sealing portion on the pole along the thickness direction.

10. The cover plate assembly according to claim 1, characterized in that: The thickness of the main body is T, and the crimping portion includes a connecting ring and a pressing ring. The connecting ring is connected to the main body and is arranged around the first through hole. The pressing ring is connected to a side of the connecting ring away from the main body and is arranged around the pole. At least part of the pressing ring is located on one side of the pole along the thickness direction. The thickness of the pressing ring is B, which satisfies: 0.5mm≤B≤0.6T.

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