Top cover assembly and battery

Abstract

The application provides a top cover assembly and a battery. The top cover assembly comprises a cover plate, a first insulating piece, a second insulating piece, a first sealing piece and a pole; the cover plate has a mounting hole, the pole is arranged in the mounting hole, and the first insulating piece and the second insulating piece are respectively arranged on two sides of the cover plate and are sleeved on the pole; wherein the first sealing piece is sleeved on the pole and seals the cover plate and the pole. The top cover assembly and the battery provided by the application can realize multi-stage sealing, can effectively block the infiltration of electrolyte into the inside of the top cover, and can reduce the probability of short circuit between the top cover and the pole.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a top cover assembly and a battery. Background Technology

[0002] Lithium-ion batteries, with their advantages of small size, high energy density, long lifespan, and environmental friendliness, have been widely used in various fields such as automotive manufacturing, electronic products, and energy storage systems. However, many current lithium-ion battery top cover assembly designs suffer from weak insulation and voltage withstand capability. Although sealing components have been designed to improve the sealing performance of the top cover assembly, this design is insufficient to effectively prevent electrolyte from seeping into the top cover, thus causing short circuits between the top cover and the terminals. Utility Model Content

[0003] The embodiments of this application provide a top cover assembly and a battery that can effectively prevent electrolyte from seeping into the interior of the top cover, thereby reducing the probability of a short circuit between the top cover and the terminal post.

[0004] In a first aspect, embodiments of this application provide a top cover assembly, which includes a cover plate, a first insulating element, a first sealing element, and an electrode post;

[0005] The cover plate has mounting holes, the pole passes through the mounting holes, and the first insulating element is located on one side of the cover plate and sleeved on the pole.

[0006] The first sealing element is sleeved on the pole post and sealed to the cover plate and the pole post. The first sealing element includes a sealing body and a first protrusion. The first protrusion is disposed at one end of the sealing body and has at least two steps facing the second insulating element and the cover plate.

[0007] In some embodiments of this application, the pole post includes a pole post body and a limiting part, the limiting part extends from the pole post body along the radial direction of the pole post, and the sealing body is sleeved on the pole post body and located on one side of the limiting part;

[0008] The first seal includes a sealing body and a first protrusion, the first protrusion being disposed on the side of the sealing body away from the pole body, and the first protrusion having at least two steps facing the second insulator and the cover plate.

[0009] In some embodiments of this application, the cover plate abuts against the sealing body, the first protrusion abuts against the limiting portion, and the step is located on the side of the first protrusion away from the limiting portion.

[0010] In some embodiments of this application, the first seal further includes:

[0011] The second protrusion is located on the side of the sealing body away from the limiting part and is in contact with the pole body;

[0012] The first end of the first insulating member abuts against the second protrusion.

[0013] In some embodiments of the present application, the first end of the first insulating member is located between the pole column body and the cover plate; and / or

[0014] The second insulating member abuts against the step of the first convex portion.

[0015] In some embodiments of the present application, the first sealing member further includes a second convex portion, which is disposed on a side of the sealing body away from the limiting portion and contacts the pole column body;

[0016] The top cover assembly further includes a pressing block, which is sleeved on the pole column body and is located on a side of the first insulating member away from the cover plate;

[0017] Wherein, one end of the second convex portion away from the sealing body abuts against the pressing block.

[0018] In some embodiments of the present application, an electrolyte collecting groove is provided between the second convex portion, the first insulating member, the cover plate and the sealing body.

[0019] In some embodiments of the present application, the compression amount of the sealing member of the first convex portion is greater than or equal to 20%.

[0020] In some embodiments of the present application, the compression amount of the second convex portion is greater than or equal to 20%.

[0021] In some embodiments of the present application, the width W1 of the first convex portion in the radial direction of the pole column and the thickness H1 in the axial direction of the pole column satisfy:

[0022] 0 mm < W1 ≤ 0.85 mm; and / or

[0023] 0 mm < H1 ≤ 0.7 mm.

[0024] In some embodiments of the present application, the width W2 of the second convex portion in the radial direction of the pole column and the thickness H2 in the axial direction of the pole column satisfy:

[0025] 0.3 mm ≤ W2 ≤ 0.8 mm; and / or

[0026] 0 mm < H2 ≤ 1.3 mm.

[0027] In some embodiments of the present application, the top cover assembly further includes a second sealing member, which is located at the connection between the first sealing member and the cover plate and is hermetically connected to the first insulating member and the cover plate.

[0028] In some embodiments of the present application, at least one of the cover plate and the first insulating member has a sealing groove, and the second sealing member is received in the sealing groove.

[0029] In some embodiments of the present application, when the sealing groove is provided on the cover plate, the compression amount of each second sealing member is greater than or equal to 35%; or

[0030] When the sealing groove is opened on the first insulating element, the compression of each second sealing element is greater than or equal to 20%.

[0031] In some embodiments of this application, the top cover assembly includes a plurality of second seals that surround the pole post and are spaced apart in the radial direction of the pole post.

[0032] In some embodiments of this application, the second seal is a trapezoidal seal.

[0033] In some embodiments of this application, the compression of the second seal is greater than or equal to 20%.

[0034] Secondly, this application also provides a battery, which includes the top cover assembly as described above.

[0035] The top cover assembly and battery provided in this application include a cover plate, a first insulating member, a second insulating member, a first sealing member, and terminals. The cover plate has mounting holes, and the terminals pass through the mounting holes. The first and second insulating members are located on both sides of the cover plate and are both sleeved on the terminals. The first sealing member is sleeved on the terminals and seals the cover plate and the terminals. The second sealing member is located at the connection between the first sealing member and the cover plate and seals the first insulating member and the cover plate. By providing the first and second sealing members in the cover plate assembly, this application achieves multi-level sealing for the top cover assembly. This reduces the probability of electrolyte seeping from between the first insulating member and the cover plate into between the first insulating member and the first sealing member during the cell electrolyte filling process, thereby reducing the probability of a short circuit between the terminals and the cover plate. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a top view of a top cover assembly provided in some embodiments of this application.

[0038] Figure 2 for Figure 1 The exploded view of the top cover assembly is shown.

[0039] Figure 3 For some embodiments of this application, the following are provided: Figure 1 The sectional view shown is III-III.

[0040] Figure 4 for Figure 3 An enlarged view of position B of the top cover assembly shown.

[0041] Figure 5 for Figure 3 The top view of the first seal shown.

[0042] Figure 6 For other embodiments of this application, along Figure 1 The sectional view shown is III-III.

[0043] Figure 7 for Figure 6 An enlarged view of position C of the top cover assembly shown.

[0044] Figure 8 For further embodiments of this application, the following are provided: Figure 1 The sectional view shown is III-III.

[0045] Figure 9 for Figure 8 An enlarged view of position D of the top cover assembly shown.

[0046] Figure 10 for Figure 8 A top view of the second seal of the top cover assembly shown.

[0047] Figure 11 For some embodiments of this application, the following are provided: Figure 1 The sectional view shown is III-III.

[0048] Figure 12 for Figure 11 An enlarged view of position E of the top cover assembly shown.

[0049] Figure 13 Other embodiments of this application provide for the following: Figure 1 The sectional view shown is III-III.

[0050] Figure 14 for Figure 13 An enlarged view of the top cover assembly at position F.

[0051] Figure 15 This is a schematic diagram of a battery module provided for some embodiments of this application.

[0052] Explanation of reference numerals in the attached figures:

[0053] 100. Battery; 101 / 201 / 301 / 40 / 501. Cover assembly; 10. Cover; 20. First insulating component; 30. Second insulating component; 40. First sealing component; 50. Second sealing component; 60. Terminal post; 70. Pressing block; 80. Explosion-proof valve; 90. Protective plate; 102. Electrolyte collection tank; X, radial direction; Z, axial direction;

[0054] 11. Mounting hole; 21. First end; 22. Second end; 23. Insulation part; 12 / 24. Sealing groove;

[0055] 41. Sealing body; 42. First protrusion; 43 / 44. Second protrusion; 61. Pole post body; 62. Limiting part; 411. First surface; 412. Second surface; 413. Third surface; 414. Fourth surface; 420. Step; 421. First step surface; 422. Second step surface; 423. First connecting surface; 424. Second connecting surface; 431. Third step surface; 432. Third connecting surface. Detailed Implementation

[0056] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0057] In related technologies, the first insulator, cover plate, second insulator, and electrode of the top cover assembly are typically sealed only by a single annular sealing ring. During the electrolyte filling process, electrolyte may seep from between the first insulator and the cover plate into the area where the first insulator and the sealing ring contact, potentially reducing the insulation strength between the electrode and the cover plate, thus increasing the risk of a short circuit between the electrode and the cover plate. Furthermore, due to limitations in the structure, shape, and size of the sealing ring, the creepage distance between the cover plate and the electrode is small, potentially leading to partial discharge on the surface of the insulating material, or even breakdown or flashover, thereby endangering the safety and reliability of the equipment. Here, "flashover" refers to a momentary arc discharge phenomenon that occurs when excessively high electric field strength causes the air or other insulating medium to break down on the insulating surface of electrical equipment or in the insulating gap between two electrodes, resulting in flashover. Flashover typically occurs in high-voltage electrical equipment and is a serious electrical fault.

[0058] To improve the above issues, please refer to Figures 1 to 5This application provides a top cover assembly 101 in some embodiments. The top cover assembly 101 includes a cover plate 10, a first insulating member 20, a second insulating member 30, a first sealing member 40, a second sealing member 50, and a pole post 60. The cover plate 10 has a mounting hole 11, through which the pole post 60 passes. The first insulating member 20 and the second insulating member 30 are located on both sides of the cover plate 10 and are both sleeved on the pole post 60. The first sealing member 40 is sleeved on the pole post 60 and seals the cover plate 10 and the pole post 60. The first sealing member 40 includes a sealing body 41 and a first protrusion 42. The first protrusion 42 is disposed at one end of the sealing body 41 and has at least two steps 420 facing the second insulating member 30 and the cover plate 10. The at least two steps 420 here can also be referred to as "skirts".

[0059] In this embodiment, the first insulating member 20 and the second insulating member 30 are the upper plastic member and the lower plastic member, respectively.

[0060] This application provides a first protrusion 42 with at least two steps 420 facing the second insulator 30 and the cover plate 10 at the end of the sealing body 41 of the first seal 40 in the cover plate assembly 101 away from the terminal body 61. This increases the creepage distance between the cover plate 10 and the terminal 60, reduces the probability of partial discharge on the surface of the insulating material, and even causes breakdown or flashover, thereby improving the electrical safety and reliability of the battery.

[0061] In some embodiments of this application, the pole post 60 includes a pole post body 61 and a limiting portion 62. The limiting portion 62 extends from the pole post body 61 along the radial direction X of the pole post 60. The sealing body 41 is sleeved on the pole post body 61 and located in the limiting portion 62. The first protrusion 42 is located in the limiting portion 62, and the step 420 is located away from the limiting portion 62. The limiting portion 62 is used to limit the second insulating member 30 and the first sealing member 40.

[0062] In other embodiments, the number of steps 420 included in the first protrusion 42 is not limited to two, and more steps can be designed according to actual needs.

[0063] In some embodiments of this application, the first seal 40 further includes a second protrusion 43 disposed on the sealing body 41; the second protrusion 43 contacts the pole body 61 and is located between the pole body 61 and the cover plate 10. The first end 21 of the first insulator 20 is located between the pole body 61 and the cover plate 10 and abuts against the second protrusion 43.

[0064] Among them, the sealing performance between the first end 21 of the first insulating member 20 and the second protrusion 43 of the first sealing member 40 and the sealing body 41 is good. It can not only increase the creepage distance between the cover plate 10 and the electrode body 61 and enhance electrical safety, but also effectively separate the electrolyte channel between the electrode 60 and the cover plate 10, effectively prevent the electrolyte from seeping into the top cover, and thus reduce the probability of short circuit between the cover plate 10 and the electrode 60 caused by the electrolyte seeping into the top cover.

[0065] The first sealing element 40 includes a first surface 411, a second surface 412, a third surface 413, and a fourth surface 414. The first surface 411 contacts the pole body 61. The second surface 412 is connected to the first surface 411 and contacts the limiting part 62. The third surface 413 is connected to the second protrusion 43 and is positioned opposite to the second surface 412. The fourth surface 414 connects the third surface 413 and the first protrusion 42 and is positioned opposite to the first surface 411.

[0066] In this embodiment, the first protrusion 42 includes two steps 420, each step 420 including a first step surface 421, a second step surface 422, a first connecting surface 423, and a second connecting surface 424. The first step surface 421 and the second step surface 422 face the cover plate 10 and / or the second insulating member 30. The first connecting surface 423 connects the first step surface 421 and the second step surface 422. The end of the first step surface 421 away from the first connecting surface 423 is connected to the fourth surface 414. The second connecting surface 424 connects the second step surface 422 and the second surface 412. The first step surface 421 and the second step surface 422 keep the distance between the cover plate 10 and the terminal post 60 in the radial direction X of the terminal post 60 unchanged. The presence of the first connecting surface 423 and the second connecting surface 424 increases the distance between the cover plate 10 and the terminal post 60 in the axial direction Z of the terminal post 60, thereby increasing the creepage distance between the cover plate 10 and the terminal post 60. This reduces the probability of partial discharge on the surface of the insulating material, and even the probability of breakdown or flashover, thereby improving the electrical safety and reliability of the battery.

[0067] In this embodiment, the second protrusion 43 includes a third stepped surface 431 and a third connecting surface 432. The second protrusion 43 is disposed on the sealing body 41. A step is formed between the third stepped surface 431 of the second protrusion 43 and the third surface 413 of the sealing body 41. The first end 21 of the first insulating member 20 abuts against the second protrusion 43 of the first sealing member 40 and the sealing body 41. The cover plate 10 abuts against the third surface 413 of the sealing body 41.

[0068] In some embodiments of the present application, the top cover assembly further includes a pressing block 70, which is sleeved on the pole column body 61 and is located on the side of the first insulating member 20 away from the cover plate 10; wherein, one end of the second convex portion 43 away from the sealing body 41 is connected to the pressing block 70, and the second convex portion 43 is located between the pole column body 61 and the cover plate 10.

[0069] Among them, through the cooperation with components such as the cover plate 10, the first sealing member 40, and the pole column 60, the pressing block 70 can effectively squeeze the first sealing member 40, thereby achieving the sealing between the interior of the battery and the external environment. This sealing effect can prevent the leakage of the electrolyte, and at the same time avoid the entry of external moisture, dust and other impurities into the interior of the battery, ensuring the safety and reliability of the battery. The pressing block 70 can also firmly fix the pole column 60 on the cover plate 10, ensuring that the pole column 60 does not loosen during the charge and discharge process of the battery. This fixing effect is crucial for ensuring the electrical connection stability of the battery. The pressing block 70 can also play a certain insulating role, preventing the electrodes inside the battery from being short-circuited with the external circuit, thereby improving the safety of the battery.

[0070] In some embodiments of the present application, the compression amount of the sealing member of the first convex portion 42 is greater than or equal to 20%, so as to strengthen the sealing performance and effectively isolate the flow of the electrolyte.

[0071] In some embodiments of the present application, the compression amount of the second convex portion 43 is greater than or equal to 20%, so as to strengthen the sealing performance and effectively isolate the flow of the electrolyte.

[0072] In some embodiments of the present application, the width W1 of the first convex portion 42 in the radial direction X of the pole column 60 and the thickness H1 in the axial direction Z of the pole column 60 satisfy:

[0073] 0 mm < W1 ≤ 0.85 mm; and / or

[0074] 0 mm < H1 ≤ 0.7 mm.

[0075] Specifically, W1 can be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, etc., and H1 can be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, etc.

[0076] Among them, the width W1 and thickness H1 of the first convex portion 42 satisfy the above numerical range, which can reasonably control the compression amount of the first seal 40, thereby strengthening the sealing performance and effectively isolating the flow of the electrolyte. In addition, when W1 and H1 satisfy the above numerical range, not only can a certain redundant space be left around the first convex portion 42 of the first seal 40 to provide a deformation space for the deformation of the first seal 40, but also the creepage distance between the pole column 60 and the cover plate 10 can be increased to a certain extent, improving the electrical safety performance.

[0077] In some embodiments of the present application, the width W2 of the second convex portion 43 in the radial direction X of the pole column 60 and the thickness H2 in the axial direction Z of the pole column 60 satisfy:

[0078] 0.3 mm ≤ W2 ≤ 0.8 mm; and / or

[0079] 0 mm < H2 ≤ 1.3 mm.

[0080] Specifically, W2 can be 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, etc., and H1 can be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, etc.

[0081] By designing the width W2 and thickness H2 of the second convex portion 43 within the above numerical range, the compression amount of the first seal 40 can be reasonably controlled, thereby strengthening the sealing performance and effectively isolating the flow of the electrolyte. When W2 and H2 satisfy the above numerical range, not only can a certain redundant space be left around the second convex portion 43 of the first seal 40 to provide a deformation space for the deformation of the first seal 40, but also the creepage distance between the pole column 60 and the cover plate 10 can be increased to a certain extent, improving the electrical safety performance.

[0082] In this embodiment, the first insulating member 20 includes a first end 21, a second end 22 and an insulating portion 23. The first end 21 and the second end 22 are respectively connected to both ends of the insulating portion 23 in the radial direction X of the pole column 60. The first end 21 and the second end 22 both extend along the axial direction Z of the pole column 60 and respectively extend backward along the axial direction Z of the pole column 60 from the insulating portion 23. The insulating portion 23 of the first insulating member 20 contacts the cover plate 10. The first end 21 of the first insulating member 20 is hermetically connected to the sealing main body 41 of the first seal 40 and / or the second convex portion 43. One end of the cover plate 10 is hermetically connected to the sealing main body 41 of the first seal 40 and faces the first end 21 of the first insulating member 20.

[0083] In this embodiment, the second insulating member 30 also abuts against the step 420 of the first protrusion 42, which can increase the sealing performance between the first protrusion 42 and the second insulating member 30, thereby reducing the probability that the electrolyte in the battery casing will enter the top cover assembly 10 from the first protrusion 42 and the second insulating member 30.

[0084] In this embodiment, the electrode 60 can be either a positive electrode or a negative electrode.

[0085] In this embodiment, the top cover assembly 101 further includes an explosion-proof valve 80 and a protective plate 90, which are installed inside the cover plate 10 and located between the positive and negative terminals. The protective plate 90 is located on the side of the explosion-proof valve 80 away from the electrolyte of the battery and is used to protect the explosion-proof valve 80. The explosion-proof valve 80 effectively prevents the battery from exploding or other dangerous situations by timely releasing the internal pressure of the battery.

[0086] In this embodiment, neither the first sealing element 40 nor the second sealing element 50 has an O-ring.

[0087] Please see Figures 5 to 7 In other embodiments of this application, a top cover assembly 201 is provided. The structure of the top cover assembly 201 is basically the same as that of the top cover assembly 101, except that the thickness of the second protrusion 44 of the top cover assembly 201 in the axial direction Z of the terminal post 60 is greater than the thickness of the second protrusion 43 of the top cover assembly 101 in the axial direction Z of the terminal post 60. This increases the creepage distance between the cover plate 10 and the terminal post 60, reduces the probability of partial discharge on the surface of the insulating material, and even reduces the likelihood of breakdown or flashover, thereby further improving the electrical safety and reliability of the battery.

[0088] In this embodiment, an electrolyte collection tank 102 is provided between the second protrusion 44, the first insulating member 20, the cover plate 10, and the sealing body 41 of the top cover assembly 201. The electrolyte collection tank 102 not only provides sufficient expansion space for the sealing ring, but also effectively contains the electrolyte and prevents it from flowing freely, thereby ensuring the stability and reliability of the system operation and ensuring electrical safety.

[0089] The end of the second protrusion 44 furthest from the sealing body 41 abuts against the pressure block 70. Thus, even if electrolyte seeps between the first insulating member 20 and the cover plate 10, it will not come into contact with the electrode post 60 due to the obstruction of the electrolyte collection tank 102 and the second protrusion 44, ensuring electrical safety.

[0090] In this embodiment, the first insulating member 20 does not include the first end 21, that is, the insulating part 23 of the first insulating member 20 faces the second protrusion 44, and the second protrusion 44 of the top cover assembly 201, the insulating part 23 of the first insulating member 20, the cover plate 10 and the sealing body 41 surround to form an electrolyte collection tank 102.

[0091] Please see Figures 8 to 10 In some embodiments of this application, a top cover assembly 301 is provided. The structure of the top cover assembly 301 is basically the same as that of the top cover assembly 101 or 201, except that the top cover assembly 301 further includes a second sealing member 50. The second sealing member 50 is located at the connection between the first sealing member 40 and the cover plate 10 and seals the first insulating member 20 and the cover plate 10.

[0092] This application provides a first sealing element 40 and a second sealing element 50 in the cover plate assembly 101 to achieve multi-level sealing of the top cover assembly 301. This reduces the probability of electrolyte seeping from between the first insulating element 20 and the cover plate 10 into between the first insulating element 20 and the first sealing element 40 during the cell electrolyte injection process, thereby ensuring the insulation strength between the terminal post 60 and the cover plate 10 and reducing the probability of a short circuit between the terminal post 60 and the cover plate 10.

[0093] In some embodiments of this application, the first seal 40 may consist only of the sealing body 41, or it may consist of the sealing body 41 and at least one of a first protrusion 42 and a second protrusion 43. Of course, if the first seal 40 is as described above, the sealing performance of the top cover assembly 301 is better, the creepage distance between the pole 60 and the cover plate 10 is longer, and the electrical safety performance is better.

[0094] In some embodiments of this application, there are multiple second sealing elements 50, which surround the electrode post 60 and are spaced apart in the radial direction X of the electrode post 60. This allows for multi-level sealing at the contact surface between the cover plate 10 and the first insulating element 20, forming multiple sealing surfaces. Each sealing surface can operate independently or collaboratively. By providing multiple sealing surfaces, when medium pressure acts on the sealing surfaces, the sealing surfaces will fit tightly together, preventing electrolyte flow and effectively blocking electrolyte from seeping into the top cover, thus preventing short circuits between the top cover plate and the electrode post.

[0095] In some embodiments of this application, the cover plate 10 has a sealing groove 12, in which the second sealing element 50 is received. The sealing groove 12 provides a fixed installation position for the second sealing element 50, allowing it to be evenly distributed within the sealing groove 12 under pressure, thereby better conforming to the sealing surface. This design effectively prevents the second sealing element 50 from shifting or twisting under pressure, ensuring the stability of the sealing effect. The sealing groove 12 also better limits the deformation range of the second sealing element 50, preventing it from being excessively squeezed and damaged under pressure, thus effectively preventing electrolyte leakage from the seal. The sealing groove 12 provides a clear installation position for the second sealing element 50, making it easier to position during installation, reducing installation errors, improving installation efficiency, and ensuring the stability of the sealing ring after installation. The sealing groove 12 also protects the second sealing element 50 from direct impact during installation, preventing damage due to improper installation.

[0096] In some embodiments of this application, there are multiple sealing grooves 12 and second sealing elements 50, that is, the number of sealing grooves 12 and second sealing elements 50 is greater than or equal to 2, and each second sealing element 50 is housed in a sealing groove 12.

[0097] In some embodiments of this application, when the sealing groove 12 is formed on the cover plate 10, the compression amount of each second seal 50 is greater than or equal to 35%. The larger compression amount of the second seal 50 can enhance the sealing performance and effectively isolate the flow of electrolyte.

[0098] Please see Figures 11 to 12 In some embodiments of this application, a top cover assembly 40 is provided. The structure of the top cover assembly 40 is basically the same as that of the top cover assembly 301, except that the sealing groove 24 of the top cover assembly 40 is formed on the first insulating member 20 and faces the cover plate 10. The compression amount of each second sealing member 50 is greater than or equal to 20%. The larger compression amount of the second sealing member 50 can enhance the sealing performance and effectively isolate the flow of electrolyte.

[0099] Please see Figures 13 to 14 The top cover assembly 501 provided in other embodiments of this application has a structure that is basically the same as that of the top cover assembly 301 or 40, except that there is only one second sealing member 50, and the second sealing member 50 is a trapezoidal sealing member. The dimension of the end of the second sealing member 50 away from the bottom wall of the sealing groove 12 or 24 is smaller than the dimension of the end near the bottom wall of the sealing groove 12 or 24.

[0100] In some embodiments of this application, the compression of the second seal 50 is greater than or equal to 20%. A larger compression of the second seal 50 enhances sealing performance and effectively prevents the flow of electrolyte.

[0101] Please see Figure 15 This application also provides a battery 100, which includes the cover assembly 101 / 201 / 301 / 40 / 501 as described above. Since this battery employs all the technical solutions of the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated upon here.

[0102] In some embodiments, the battery 100 further includes a housing and an electrode assembly, the electrode assembly being installed inside the housing and a top cover assembly being installed inside the housing, the terminals of the top cover assembly being electrically connected to the tabs of the electrode assembly.

[0103] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A top cover assembly, characterized in that, It includes a cover plate, a first insulating member, a second insulating member, a first seal and a pole column; The cover plate has a mounting hole through which the pole column passes, and the first insulating member and the second insulating member are respectively located on both sides of the cover plate and sleeved on the pole column; Wherein, the first seal is sleeved on the pole column and is hermetically connected to the cover plate and the pole column. The first seal includes a sealing body and a first convex portion. The first convex portion is provided at one end of the sealing body, and the first convex portion has at least two steps facing the second insulating member and the cover plate.

2. The top cover assembly as claimed in claim 1, characterized in that, The pole column includes a pole column body and a limiting portion. The limiting portion extends from the pole column body in the radial direction of the pole column. The sealing body is sleeved on the pole column body and is located on one side of the limiting portion; The first seal includes a sealing body and a first convex portion. The first convex portion is provided on the side of the sealing body away from the pole column body, and the first convex portion has at least two steps facing the second insulating member and the cover plate.

3. The top cover assembly as described in claim 2, characterized in that, The cover plate abuts against the sealing body, the first convex portion abuts against the limiting portion, and the steps are located on the side of the first convex portion away from the limiting portion.

4. The top cover assembly as claimed in claim 2, characterized in that, The first seal further includes: A second convex portion provided on the side of the sealing body away from the limiting portion and in contact with the pole column body; Wherein, the first end of the first insulating member abuts against the second convex portion.

5. The top cover assembly as claimed in claim 4, characterized in that, The first end of the first insulating member is located between the pole column body and the cover plate; and / or The second insulating member abuts against the steps of the first convex portion.

6. The top cover assembly as claimed in claim 2, characterized in that, The first seal further includes a second convex portion. The second convex portion is provided on the side of the sealing body away from the limiting portion and in contact with the pole column body; The top cover assembly further includes a pressing block. The pressing block is sleeved on the pole column body and is located on the side of the first insulating member away from the cover plate; Wherein, the end of the second convex portion away from the sealing body abuts against the pressing block.

7. The top cover assembly as claimed in claim 6, characterized in that, There is an electrolyte collection groove between the second convex portion, the first insulating member, the cover plate and the sealing body.

8. The top cover assembly as described in any one of claims 2-7, characterized in that, The compression amount of the first convex portion of the seal is greater than or equal to 20%; 9. The top cover assembly as claimed in any one of claims 4-7, characterized in that, The compression amount of the second convex portion is greater than or equal to 20%.

10. The top cover assembly as claimed in any one of claims 2-7, characterized in that, The width W1 of the first convex portion in the radial direction of the pole column and the thickness H1 in the axial direction of the pole column satisfy: 0 < W1 ≤ 0.85 mm; and / or 0 < H1 ≤ 0.7 mm.

11. The top cover assembly as claimed in any one of claims 4-7, characterized in that, The width W2 of the second convex portion in the radial direction of the pole column and the thickness H2 in the axial direction of the pole column satisfy: 0.3 mm ≤ W2 ≤ 0.8 mm; and / or 0 mm < H2 ≤ 1.3 mm.

12. The top cover assembly as claimed in any one of claims 1-7, characterized in that, It further includes a second seal. The second seal is located at the connection between the first seal and the cover plate and is hermetically connected to the first insulating member and the cover plate.

13. The top cover assembly as claimed in claim 12, characterized in that, At least one of the cover plate and the first insulating member has a sealing groove, and the second seal is received in the sealing groove.

14. The top cover assembly as claimed in claim 13, characterized in that, When the sealing groove is provided on the cover plate, the compression amount of each second seal is greater than or equal to 35%; or When the sealing groove is formed on the first insulating member, the compression of each second sealing member is greater than or equal to 20%.

15. The top cover assembly as claimed in claim 12, characterized in that, The top cover assembly includes a plurality of second seals, which surround the pole post and are spaced apart in the radial direction of the pole post.

16. The top cover assembly as claimed in claim 12, characterized in that, The second seal is a trapezoidal seal.

17. The top cover assembly as claimed in claim 16, characterized in that, The compression of the second seal is greater than or equal to 20%.

18. A battery, characterized in that, Includes the top cover assembly as described in any one of claims 1-17.

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