Top cover assembly and battery pack

Abstract

The utility model provides a top cover assembly and a battery pack. The top cover assembly comprises a cover plate which is provided with a pole hole penetrating through the upper surface and the lower surface of the cover plate; the pole is mounted in the pole hole; the insulating assembly comprises an upper insulating part and a lower insulating part, the upper insulating part is mounted on the upper surface of the cover plate and comprises an upper insulating part which abuts against the position between the pole and the cover plate, and the lower insulating part is mounted on the lower surface of the cover plate and abuts against the position between the pole and the cover plate; the sealing element is propped between the pole and the cover plate; wherein the outer side surface, far away from the pole, of the sealing element comprises at least one step surface, and the sealing element is also propped between the upper insulating element and the lower insulating element so as to be extruded to be in a compressed state. The sealing element is abutted between the upper insulating element and the lower insulating element so as to be extruded to be in a compressed state, so that the sealing element is sealed with the cover plate, the upper insulating element and the lower insulating element, and even if the electrolyte flows into a gap in the top cover assembly, the pole can be isolated from the electrolyte.

Description

Technical Field

[0001] The utility model relates to the field of batteries, and particularly to a top cover assembly and a battery pack. Background Art

[0002] In the structure of the top cover assembly, it usually includes a liquid injection hole and a pole column located in the pole column hole. During the process of injecting liquid electrolyte into the battery through the liquid injection hole, the phenomenon that the electrolyte sprays out from the inside of the battery may occur, and the sprayed electrolyte may flow into the gap between the cover plate and the pole column, forming a conduction path between the cover plate and the pole column, ultimately resulting in a short circuit of the battery and causing safety problems. Summary of the Utility Model

[0003] An embodiment of the utility model provides a top cover assembly and a battery pack, which can improve the safety problem of the battery.

[0004] In a first aspect, an embodiment of the utility model provides a top cover assembly, which includes:

[0005] A cover plate, having a cover plate upper surface and a cover plate lower surface arranged oppositely, and provided with a pole column hole penetrating through the cover plate upper surface and the cover plate lower surface;

[0006] A pole column, installed in the pole column hole;

[0007] An insulating assembly, including an upper insulating member and a lower insulating member. The upper insulating member is installed on the cover plate upper surface and includes an upper insulating portion abutted between the pole column and the cover plate. The lower insulating member is installed on the cover plate lower surface and abuts between the pole column and the cover plate; and

[0008] A seal, abutted between the pole column and the cover plate;

[0009] Wherein, the outer side surface of the seal away from the pole column includes at least one stepped surface, and the seal also abuts between the upper insulating member and the lower insulating member to be squeezed and in a compressed state.

[0010] In one embodiment, the hardness of the seal is 60HA to 85HA, and the compression amount range of the seal is 10% to 45%. The compression amount is the ratio of the thickness of the compressed seal to the original thickness of the seal.

[0011] In one embodiment, the outer side surface of the seal includes one or more stepped surfaces.

[0012] In one embodiment, the number of stepped surfaces is less than or equal to 5.

[0013] In one embodiment, the plurality of stepped surfaces include a first stepped surface close to the lower insulating member, a third stepped surface close to the upper insulating member, and a second stepped surface located between the first stepped surface and the third stepped surface. The first stepped surface abuts against the lower insulating member, the second stepped surface abuts against the cover plate, and the third stepped surface abuts against the upper insulating member.

[0014] In one embodiment, the third stepped surface includes a horizontal plane extending in the horizontal direction and an inclined surface obliquely connected to the horizontal plane.

[0015] In one embodiment, the width of the top surface is greater than the width of the first stepped surface.

[0016] In one embodiment, the outer side surface of the seal includes a stepped surface that abuts against the lower insulating member, and the top surface of the seal abuts against the cover plate and the upper insulating member.

[0017] In one embodiment, a boss surrounding the pole post hole is provided on the upper surface of the cover plate, and the upper insulating member further includes an upper mounting portion, and the upper mounting portion is provided with a groove to receive the boss.

[0018] In one embodiment, the top cover assembly further includes a conductive connecting member connected to the outside of the pole post, and the upper insulating member further includes an upper main body portion, and the upper main body portion is snap-fitted to the outside of the conductive connecting member.

[0019] In one embodiment, the width of the boss is D, the width of the conductive connecting member is L, and the width of the cover plate is M; wherein, 0.8 mm ≤ D ≤ M / 2 - L / 2 - 1.8 mm.

[0020] In one embodiment, the distance between the side of the boss close to the pole post and the center of the pole post hole is T; wherein, L / 2 + 0.8 mm ≤ T ≤ M / 2 - 1 mm.

[0021] In one embodiment, the upper mounting portion is connected to the outside of the upper main body portion, the upper insulating member includes an upper insulating portion abutting between the pole post and the cover plate, the upper insulating portion is bent and connected to one end of the upper main body portion, and the other end of the upper main body portion is snap-fitted to the outside of the conductive connecting member.

[0022] In a second aspect, an embodiment of the present invention provides a battery pack, including a plurality of top cover assemblies as in the first aspect.

[0023] The present invention provides a top cover assembly and a battery pack. The top cover assembly includes a cover plate, a pole post, an insulating assembly, and a seal located between the pole post and the cover plate. Among them, the seal abuts between the upper insulating member and the lower insulating member of the insulating assembly to be squeezed and in a compressed state, strengthening the sealing performance between the cover plate and the pole post, thereby improving the safety problem of the battery. Description of the Drawings

[0024] To more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for description in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0025] Figure 1 is a schematic structural diagram of a top cover assembly in the related art;

[0026] Figure 2 is a schematic structural diagram of the top cover assembly provided by the embodiment of the present utility model;

[0027] Figure 3 is Figure 2 an enlarged schematic diagram of part A in

[0028] Figure 4 is a schematic structural diagram of the top cover assembly provided by the embodiment of the present utility model;

[0029] Figure 5 is a schematic structural diagram of the top cover assembly provided by the embodiment of the present utility model;

[0030] Figure 6 is Figure 5 an enlarged schematic diagram of part B in

[0031] Figure 7 is a schematic structural diagram of the top cover assembly provided by the embodiment of the present utility model;

[0032] Figure 8 is a three-dimensional structural schematic diagram of the cover plate provided by the embodiment of the present utility model;

[0033] Figure 9 is Figure 8 a top view of

[0034] Explanation of reference numerals:

[0035] 100A, top cover assembly; 110A, cover plate; 120A, pole column; 131A, upper insulating part; 132A, lower insulating part; 140A, sealing part; 150A, conductive connecting part; 100, top cover assembly; 110, cover plate; 111, boss; 120, pole column; 130, insulating assembly; 131, upper insulating part; 132, lower insulating part; 140, sealing part; 141, first step surface; 142, second step surface; 143, third step surface; 150, conductive connecting part; 160, pole column hole; 210, upper insulating portion; 220, upper mounting portion; 230, upper main body portion; 310, upper concave portion; 320, lower concave portion. Detailed implementation manners

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention. In addition, it should be understood that the specific implementation manners described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention. In the present invention, unless otherwise stated, the orientation words such as "upper" and "lower" generally refer to the upper and lower in the actual use or working state of the device, specifically the drawing direction in the accompanying drawings; and "inner" and "outer" refer to the outline of the device.

[0037] In the related art, please refer to Figure 1 , Figure 1 which is a schematic structural diagram of a top cover assembly in the related art. The sealing member 140A does not have a stepped surface on the side away from the pole column 120A, and the abutting surface where its side away from the pole column 120A abuts against the lower insulating member 132A and the top surface and the abutting surface between the cover plate 110A and the upper insulating member 131A are flat. When all the components in the top cover assembly 100A are installed, there will be a gap between the upper insulating member 131A, the lower insulating member 132A and the sealing member 140A. When injecting electrolyte into the battery through the liquid injection hole in the top cover assembly, a liquid spraying phenomenon may occur, that is, the electrolyte will spray out from the liquid injection hole, and then the electrolyte may flow through the gap between the upper insulating member 131A and the cover plate 110A to the gap between the cover plate 110A and the pole column 120A, thereby causing a conduction path to be formed between the cover plate 110A and the pole column 120A, resulting in a battery short circuit and thus triggering a safety problem.

[0038] To improve the safety problem of the battery, an embodiment of the present invention provides a top cover assembly 100. Please refer to Figure 2 , Figure 3 , Figure 5 and Figure 6 , Figure 2 which is a schematic structural diagram of the top cover assembly 100 provided by the embodiment of the present invention, Figure 3 is Figure 2 an enlarged schematic view of part A in Figure 5 which is a schematic structural diagram of the top cover assembly 100 provided by the embodiment of the present invention, Figure 6 is Figure 5 an enlarged schematic view of part B in

[0039] Among them, please refer to Figure 2 ,Figure 5 , Figure 8 and Figure 9 , Figure 8 FIG. 11 is a schematic perspective view of the cover plate 110 provided by an embodiment of the present utility model, Figure 9 and Figure 8 FIG. 12 is a top view of FIG. 11. The cover plate 110 has a cover plate upper surface and a cover plate lower surface which are oppositely arranged. The cover plate 110 is further provided with a pole hole 160 penetrating through the cover plate upper surface and the cover plate lower surface, and the pole 120 is installed in the pole hole 160.

[0040] It is easy to understand that the pole hole 160 can be a positive pole hole or a negative pole hole. Correspondingly, the pole 120 can be a positive pole or a negative pole. The positive pole is installed in the positive pole hole, and the negative pole is installed in the negative pole hole. The insulating assembly 130 includes an upper insulating member 131 installed on the cover plate upper surface and a lower insulating member 132 installed on the cover plate lower surface. The lower insulating member 132 abuts between the pole 120 and the cover plate 110. The outer side surface of the seal 140 away from the pole includes at least one stepped surface, and the seal 140 abuts between the upper insulating member 131 and the lower insulating member 132 and is in a compressed state respectively by being squeezed by the cover plate 110, the upper insulating member 131, and the lower insulating member 132.

[0041] In this embodiment, since the seal 140 is in a compressed state by being squeezed by the cover plate 110, the upper insulating member 131, and the lower insulating member 132, a sealed state is formed between the seal 140 and the cover plate 110, the upper insulating member 131, and the lower insulating member 132. Even if the electrolyte flows into the gap between the cover plate 110 and the upper insulating member 131 and / or between the cover plate 110 and the lower insulating member 132, it can be ensured that the electrolyte cannot pass through this gap, so that the pole 120 is isolated from the electrolyte.

[0042] In some embodiments, the hardness of the seal 140 is 60 HA to 85 HA. When the seal 140 is in a compressed state, the compression amount ranges from 10% to 45%. Wherein, the compression amount is the ratio of the thickness of the compressed seal 140 to the original thickness of the seal 140.

[0043] For example, the original thickness of a seal 140 is 10 mm, and its material hardness is 60 HA. Its compressed thickness is 4.5 mm, that is, the compression amount of this seal 140 is 45% at this time. It is easy to understand that when different materials of the seal 140 are selected, the range of the corresponding compression amount of the seal 140 will be different. It only needs to ensure that when the components in the top cover assembly 100 are assembled, the sealing effect between the upper insulating member 131, the lower insulating member 132 and the seal 140 meets the requirements.

[0044] In this embodiment, the material hardness of the seal 140 is limited to be between 60 HA and 85 HA. For the seal 140 with the material hardness within this range, its material will not be so hard that it is difficult to deform when other components apply extrusion pressure to it, resulting in difficult or even impossible component assembly. Nor will its material be so soft that although other components can apply extrusion pressure to cause deformation, due to its overly soft texture, the gap between other components and the seal 140 cannot meet the required sealing requirements. When the material hardness of the seal 140 is between 60 HA and 85 HA, after the components in the top cover assembly 100 are installed, the sealing performance between other components and the seal 140 is relatively good.

[0045] In some embodiments, the outer side surface of the seal 140 includes one or more stepped surfaces. Among them, the stepped surfaces in this application include a first surface and a second surface that are bent and connected to form a stepped structure of the seal 140. For example, the first surface can be a horizontal surface or an inclined surface inclined relative to the horizontal surface, and the second surface can be a vertical surface or an inclined surface inclined relative to the vertical surface.

[0046] Specifically, please refer to Figure 2 and Figure 3 , the inner side surface of the seal 140 abuts against the side surface of the pole column 120 in the vertical direction. The outer side surface of the seal 140 is disposed opposite to the inner side surface of the seal 140 and is provided with a plurality of stepped surfaces. The plurality of stepped surfaces include a first stepped surface 141 close to the lower insulating member 132, a third stepped surface 143 close to the upper insulating member 131, and a second stepped surface 142 located between the first stepped surface 141 and the third stepped surface 143. The first stepped surface 141 abuts against the lower insulating member 132, the second stepped surface 142 abuts against the cover plate 110, and the third stepped surface 143 abuts against the upper insulating member 131.

[0047] In this embodiment, since the seal 140 not only includes the first stepped surface 141 abutting against the lower insulating member 132, but also includes the second stepped surface 142 abutting against the lower surface of the cover plate and the third stepped surface 143 abutting against the upper insulating member 131. In this case, the number of stepped surfaces of the seal 140 is relatively large, and the dimensional accuracy requirements for the seal 140 are higher. Therefore, the processing difficulty of the seal 140 is relatively high. However, because the third stepped surface 143 and the second stepped surface 142 are not on the same horizontal plane to form a height difference, even if the electrolyte flows into the second stepped surface 142 from the gap between the cover plate 110 and the upper insulating part 210, due to the existence of the height difference, it is difficult for the electrolyte located on the second stepped surface 142 to contact the pole column 120 through the gap between the upper insulating part 210 and the third stepped surface 143. Thus, the sealing effect between the seal 140 of the top cover assembly 100 and the upper insulating member 131 and the lower insulating member 132 is relatively good.

[0048] In some embodiments, please refer to Figure 3 , the third step surface 143 includes a horizontal plane extending in the horizontal direction and an inclined surface obliquely connected to the horizontal plane. In this embodiment, since the seal 140 is an elastic structure, through the connection structure of the horizontal plane and the inclined surface of the third step surface 143, when the horizontal plane in the third step surface 143 is squeezed by the upper insulating member 131, this structure can make the volume of the seal 140 being compressed expand towards the direction of the inclined surface, so that the sealing performance between the inclined surface and the upper insulating member 131 is better. Thus, while ensuring that the sealing performance between the horizontal plane in the third step surface 143 and the upper insulating member 131 meets the requirements, it can also ensure that the sealing performance between the horizontal plane in the third step surface 143 and the upper insulating member 131 is relatively good. At the same time, this structure helps to form a "wedging" or self-locking effect. When an extrusion force is applied, the inclined surface will cause the upper insulating member 131 and the seal 140 to be squeezed more tightly together to enhance the sealing effect.

[0049] Specifically, please refer to Figure 5 and Figure 6 , only one step surface, that is, the first step surface 141, is provided on the side surface of the seal 140 away from the pole column 120. The first step surface 141 abuts against the lower insulating member 132, and the top surface of the seal 140 abuts against the cover plate 110 and the upper insulating member 131.

[0050] In this embodiment, since the seal 140 only includes the first step surface 141 abutting against the lower insulating member 132 and the top surface, in this case, the lower surface of the upper insulating portion 210 and the lower surface of the cover plate 110 are on the same horizontal plane, that is, there is no height difference. When the electrolyte flows from the gap between the upper insulating portion 210 and the cover plate 110 to the top surface of the seal 140, there is a risk that the electrolyte reaches the pole column 120 through the gap between the upper insulating portion 210 and the seal 140, resulting in a battery short circuit. However, the number of step surfaces of the seal 140 is small, so the processing difficulty of the seal 140 is low, which is convenient for production and processing.

[0051] It is easy to understand that correspondingly to the step surface, the upper insulating member 131 is provided with an upper concave portion 310 that fits with the third step surface 143, and / or the lower insulating member 132 is provided with a lower concave portion 320 that fits with the first step surface 141.

[0052] The upper insulating member 131 and / or the lower insulating member 132 are also provided with recesses that fit the stepped surfaces, so that after the components in the top cover assembly 100 are installed, the recesses of the upper insulating member 131 and / or the lower insulating member 132 can fit the corresponding stepped surfaces in the seal 140 and squeeze the seal 140, so that a sealed state is formed between the upper insulating member 131 and / or the lower insulating member 132 and the seal 140. Furthermore, even if the electrolyte flows into the gaps in the top cover assembly 100, it can be ensured that the terminal 120 is isolated from the electrolyte.

[0053] In some embodiments, the number of stepped surfaces of the seal 140 is less than or equal to 5.

[0054] When the number of stepped surfaces is greater than or equal to 1, when the upper insulating member 131 and the lower insulating member 132 squeeze the seal 140, the recesses on the upper insulating member 131 and / or the lower insulating member 132 can fit the stepped surfaces of the seal 140, and the sealing effect between the upper insulating member 131, the lower insulating member 132 and the seal 140 is better as the number of stepped surfaces increases. However, it can be obtained from the experimental data that when the number of stepped surfaces of the seal 140 is set to be greater than 5, as the number of stepped surfaces increases, the improvement of its sealing effect is not obvious, and because the size of the seal 140 is small, the requirement for the dimensional accuracy of the seal 140 during processing is higher, and its processing difficulty is also higher. At the same time, as the number of stepped surfaces increases, the risk of damage to the corners of the stepped surfaces is higher when they are squeezed by the upper insulating member 131 and the lower insulating member 132. Therefore, the number of stepped surfaces of the seal 140 is limited to less than or equal to 5. In this case, the sealing effect between the upper insulating member 131, the lower insulating member 132 and the seal 140 can meet the requirements, the processing difficulty is not high, and the corners of the stepped surfaces are not easily damaged.

[0055] In some embodiments, the width of the second stepped surface 142 is greater than the width of the first stepped surface 141.

[0056] Please refer to Figure 3 , the width d2 of the second stepped surface 142 is greater than the width d1 of the first stepped surface 141. Specifically, by setting the width of the second stepped surface 142 to be greater than the width of the first stepped surface 141, the second stepped surface 142 has a larger contact area, and a larger contact area also means that there will be a larger surface friction when the lower surface of the cover plate abuts against the second stepped surface 142 of the seal 140, thereby increasing the stability and sealing performance between the cover plate 110 and the seal 140.

[0057] In some embodiments, please refer to Figures 2 to 5 . The upper surface of the cover plate is provided with a boss 111 surrounding the terminal hole 160, and the upper insulating member 131 further includes an upper mounting portion 220, and the upper mounting portion 220 is provided with a groove to receive the boss 111.

[0058] In this embodiment, a boss 111 surrounding the pole hole 160 is provided on the upper surface of the cover plate. At the same time, the upper insulating member 131 further includes an upper mounting portion 220 provided with a groove to receive the boss 111. Compared with the cover plate 110 in the related art, when liquid spraying occurs, the electrolyte needs to travel a longer distance to reach the pole 120. At the same time, due to the height difference between the boss 111 and the upper surface of the cover plate, it is more difficult for the electrolyte to reach the pole 120 through the gap between the upper insulating member 131 and the cover plate 110, thereby reducing the risk of battery short - circuit caused by the easy passage of the electrolyte through the gap.

[0059] In some embodiments, please refer to Figures 2 to 5 . The top cover assembly 100 further includes a conductive connecting member 150 connected to the outside of the pole 120. The upper insulating member 131 further includes an upper main body portion 230, and the upper main body portion 230 is snap - fitted to the outside of the conductive connecting member 150.

[0060] Specifically, the upper insulating member 131 in this embodiment includes an upper main body portion 230, and one end of the upper main body portion 230 away from the seal 140 is bent and snap - fitted to the outside of the conductive connecting member 150. In the related art, the upper insulating member 131 abuts against the conductive connecting member 150, but one end of the upper insulating member 131 away from the seal 140 is not bent. Therefore, the risk of the electrolyte flowing to the pole 120 through the gap between the upper main body portion 230 and the conductive connecting member 150 is relatively high. In this embodiment, by bending one end of the upper main body portion 230 away from the seal 140 and snap - fitting it to the outside of the conductive connecting member 150, the distance for the electrolyte to reach the pole 120 through the gap between the upper main body portion 230 and the conductive connecting member 150 is increased, and the risk of the electrolyte flowing to the pole 120 through the gap between the upper main body portion 230 and the conductive connecting member 150 is reduced.

[0061] In some embodiments, please refer to Figures 9 to 7 , the width of the boss 111 is D, the width of the conductive connecting member 150 is L, and the width of the cover plate 110 is M; wherein, 0.8 mm ≤ D ≤ M / 2 - L / 2 - 1.8 mm.

[0062] It can be seen from the experimental data that when the width D of the boss 111 is set to be less than 0.8 mm, the processing difficulty is relatively high and the manufacturability is relatively low. When the width D of the boss 111 is set to be greater than M / 2 - L / 2 - 1.8 mm, the width of the boss 111 is relatively large at this time. Since the upper mounting portion 220 with a groove of the upper insulating member 131 is used to accommodate the boss 111, the length of the upper mounting portion 220 of the upper insulating member 131 will also increase accordingly, thus increasing the production cost. When the width D of the boss 111 is greater than or equal to 0.8 mm and less than or equal to M / 2 - L / 2 - 1.8 mm, the processing difficulty of the boss 111 and the production cost of the upper insulating member 131 are both relatively low, and at the same time, the sealing requirement of the top cover assembly 100 can be satisfied.

[0063] In some embodiments, please refer to Figure 4 and Figure 7 , the distance between the side of the boss 111 close to the pole 120 and the center of the pole hole 160 is T; wherein, L / 2 + 0.8 mm ≤ T ≤ M / 2 - 1 mm.

[0064] It can be seen from the experimental data that when the distance T between the side of the boss 111 close to the pole 120 and the center of the pole hole 160 is set to be less than L / 2 + 0.8 mm, the distance between the boss 111 and one side of the pole 120 is relatively close, which will affect the thickness of the upper insulating member 131 and the size of the conductive connecting member 150, resulting in general structural strength of the upper insulating member 131 and the conductive connecting member 150. When the distance T between the side of the boss 111 close to the pole 120 and the center of the pole hole 160 is set to be greater than M / 2 - 1 mm, the distance between the boss 111 and one side of the pole 120 is relatively far, resulting in a relatively long length of the upper mounting portion 220 of the upper insulating member 131 for accommodating the boss 111, thus increasing the production cost. When the distance T between the side of the boss 111 close to the pole 120 and the center of the pole hole 160 is set to be greater than or equal to L / 2 + 0.8 mm and less than or equal to M / 2 - 1 mm, the distance between the boss 111 and one side of the pole 120 is appropriate at this time, which can ensure relatively high structural strength of the upper insulating member 131 and the conductive connecting member 150, and at the same time, can also reduce the production cost of the upper insulating member 131.

[0065] An embodiment of the present utility model provides a top cover assembly 100, which includes a cover plate 110, a terminal post 120, an insulating assembly 130, and a seal 140 located between the terminal post 120 and the cover plate 110. Among them, the cover plate 110 has a cover plate upper surface and a cover plate lower surface arranged oppositely, and the cover plate 110 is further provided with a terminal post hole 160 penetrating through the cover plate upper surface and the cover plate lower surface, and the terminal post 120 is installed in the terminal post hole 160. The insulating assembly 130 includes an upper insulating member 131 installed on the cover plate upper surface and a lower insulating member 132 installed on the cover plate lower surface. The upper insulating member 131 includes an upper insulating portion 210 located between the terminal post 120 and the cover plate 110, and the lower insulating member 132 abuts between the terminal post 120 and the cover plate 110. The seal 140 abuts between the upper insulating member 131 and the lower insulating member 132 and is in a compressed state under the extrusion of the cover plate 110, the upper insulating member 131, and the lower insulating member 132 respectively. So that a sealed state is formed between the seal 140 and the cover plate 110, the upper insulating member 131, and the lower insulating member 132. Even if the electrolyte flows into the gap in the top cover assembly 100, it can ensure that the terminal post 120 is isolated from the electrolyte.

[0066] An embodiment of the present utility model also provides a battery pack, which includes a plurality of the above-mentioned top cover assemblies 100. Among them, the battery pack includes a plurality of battery cells, and each top cover assembly 100 is used to encapsulate and protect the corresponding battery cell. The battery pack provided by the embodiment of the present utility model has all the advantages of the above-mentioned top cover assembly 100, which will not be elaborated here.

[0067] The above has introduced the embodiments of the present utility model in detail. Specific examples are used in this article to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model; at the same time, for those skilled in the art, according to the idea of the present utility model, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present utility model.

Claims

1. A top cover assembly, characterized in that: include: The cover plate has an upper cover plate surface and a lower cover plate surface that are arranged opposite to each other, and is provided with a pole hole that passes through the upper cover plate surface and the lower cover plate surface; A pole, installed in the pole hole; An insulating assembly, comprising an upper insulating member and a lower insulating member, wherein the upper insulating member is mounted on the upper surface of the cover plate, and the lower insulating member is mounted on the lower surface of the cover plate and abuts between the pole and the cover plate; as well as A sealing member abutting between the pole and the cover plate; The outer side surface of the sealing member away from the pole includes at least one step surface, and the sealing member is also abutted between the upper insulating member and the lower insulating member to be squeezed and in a compressed state.

2. The top cover assembly according to claim 1, characterized in that: The hardness of the seal is 60HA to 85HA, and the compression amount of the seal ranges from 10% to 45%. The compression amount is the ratio of the thickness of the seal after compression to the original thickness of the seal.

3. The top cover assembly according to claim 1, characterized in that: The number of the step surfaces is less than or equal to 5.

4. The top cover assembly according to claim 1, characterized in that: The multiple step surfaces include a first step surface close to the lower insulating member, a third step surface close to the upper insulating member, and a second step surface located between the first step surface and the third step surface. The first step surface abuts against the lower insulating member, the second step surface abuts against the cover plate, and the third step surface abuts against the upper insulating member.

5. The top cover assembly according to claim 4, characterized in that: The third step surface includes a horizontal surface extending in a horizontal direction and an inclined surface obliquely connected to the horizontal surface.

6. The top cover assembly according to claim 4, characterized in that: The width of the second step surface is greater than the width of the first step surface.

7. The top cover assembly according to claim 1, characterized in that: The outer side surface of the sealing member includes a step surface, the step surface abuts against the lower insulating member, and the top surface of the sealing member abuts against the cover plate and the upper insulating member.

8. The top cover assembly according to claim 1, characterized in that: It also includes a conductive connector connected to the outer side of the pole, and the upper insulating member also includes an upper main body, and the upper main body is clamped on the outer side of the conductive connector.

9. The top cover assembly according to claim 8, characterized in that: The width of the boss is D, the width of the conductive connector is L, and the width of the cover plate is M; wherein 0.8 mm ≤ D ≤ M / 2-L / 2-1.8 mm.

10. The top cover assembly according to claim 9, characterized in that: The distance between the side of the boss close to the pole and the center of the pole hole is T; wherein, L / 2+0.8mm≤T≤M / 2-1mm.

11. The top cover assembly according to claim 10, characterized in that: The upper mounting portion is connected to the outer side of the upper main body portion, the upper insulating member includes an upper insulating portion abutting between the pole and the cover plate, the upper insulating portion is bently connected to one end of the upper main body portion, and the other end of the upper main body portion is clamped to the outer side of the conductive connecting member.

12. A battery pack, characterized in that: It comprises a plurality of top cover assemblies as described in any one of claims 1-11.

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