Top cover assembly, battery pack, and electric device

Abstract

A top cover assembly (100), a battery pack, and an electric device. The top cover assembly (100) comprises a cover plate (110), a pole (120), an insulating assembly (130), and a sealing member (140). The insulating assembly (130) comprises an upper insulating member (131) and a lower insulating member (132). The sealing member (140) abuts between the pole (120) and the cover plate (110). The outer side surface of the sealing member (140) away from the pole (120) comprises at least one step surface. The sealing member (140) further abuts between the upper insulating member (131) and the lower insulating member (132), so as to be in a compressed state.

Description

Top cover assembly, battery pack and electric device

[0001] The present application claims priority to the Chinese patent application No. 2024215583863 filed on July 03, 2024 with the China National Intellectual Property Office, the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the field of battery, in particular to a top cover assembly and a battery pack. BACKGROUND

[0003] In the structure of the top cover assembly, it usually includes a liquid injection hole and a pole located in the pole hole. SUMMARY

[0004] In the process of injecting electrolyte into the battery through the liquid injection hole, the electrolyte may be sprayed from the inside of the battery, and the sprayed electrolyte may flow into the gap between the cover plate and the pole, forming a guide between the cover plate and the pole, and finally causing the battery to short circuit.

[0005] Therefore, the present application adopts the following technical solutions:

[0006] In a first aspect, the embodiments of the present application provide a top cover assembly, which comprises a cover plate having an upper surface and a lower surface oppositely arranged and provided with a pole hole penetrating through the upper surface and the lower surface; a pole installed in the pole hole; an insulation assembly comprising an upper insulation member and a lower insulation member, the upper insulation member being installed on the upper surface of the cover plate and comprising an upper insulation part abutting between the pole and the cover plate, the lower insulation member being installed on the lower surface of the cover plate and abutting between the pole and the cover plate; and a sealing member abutting between the pole and the cover plate; wherein the outer side of the sealing member away from the pole comprises at least one stepped surface, and the sealing member also abuts between the upper insulation member and the lower insulation member to be compressed in a compressed state.

[0007] In a second aspect, the embodiments of the present application provide a battery pack, which comprises a plurality of the above-mentioned top cover assemblies.

[0008] In a third aspect, the embodiments of the present application provide an electric device. The electric device comprises the above-mentioned battery pack. ADVANTAGEOUS EFFECTS

[0009] The top cover assembly provided by the present application comprises a cover plate, a pole, an insulation assembly and a sealing member located between the pole and the cover plate, wherein the sealing member abuts between the upper insulation member and the lower insulation member of the insulation assembly to be compressed in a compressed state, thereby enhancing the sealing performance between the cover plate and the pole and ensuring the safety of the battery.

[0010] The battery pack provided by the present application has all the advantages of the above-mentioned top cover assembly.

[0011] The power utilization device provided in the application has all the advantages of the battery pack. BRIEF DESCRIPTION OF DRAWINGS

[0012] FIG. 1 is a structural schematic diagram of a top cover assembly in the related art;

[0013] FIG. 2 is a structural schematic diagram of a top cover assembly provided in an embodiment of the application;

[0014] FIG. 3 is an enlarged schematic diagram of part A in FIG. 2;

[0015] FIG. 4 is a structural schematic diagram of a top cover assembly provided in an embodiment of the application;

[0016] FIG. 5 is a structural schematic diagram of a top cover assembly provided in an embodiment of the application;

[0017] FIG. 6 is an enlarged schematic diagram of part B in FIG. 5;

[0018] FIG. 7 is a structural schematic diagram of a top cover assembly provided in an embodiment of the application;

[0019] FIG. 8 is a three-dimensional structural schematic diagram of a cover plate provided in an embodiment of the application;

[0020] FIG. 9 is a top view of FIG. 8;

[0021] Explanation of reference signs:

[0022] 100A, top cover assembly; 110A, cover plate; 120A, pole; 131A, upper insulating member; 132A, lower insulating member; 140A, sealing member; 150A, conductive connecting member; 100, top cover assembly; 110, cover plate; 111, boss; 120, pole; 130, insulating assembly; 131, upper insulating member; 132, lower insulating member; 140, sealing member; 141, first step surface; 142, second step surface; 143, third step surface; 150, conductive connecting member; 160, pole hole; 210, upper insulating portion; 220, upper mounting portion; 230, upper main body portion; 310, upper recessed portion; 320, lower recessed portion. Embodiments of the application

[0023] In the related art, referring to FIG. 1, which is a structural schematic diagram of a top cover assembly in the related art. The seal 140A is not provided with a stepped surface on the side away from the pole 120A, and the abutting surface of the side away from the pole 120A abutting against the lower insulating piece 132A and the abutting surface between the top surface and the cover plate 110A, the upper insulating piece 131A are planes. When each component in the top cover assembly 100A is installed, there will be a gap between the upper insulating piece 131A, the lower insulating piece 132A and the seal 140A. When electrolyte is injected into the battery from the injection hole in the top cover assembly, liquid injection may occur, that is, the electrolyte may be sprayed out of the injection hole, and then the electrolyte may flow through the gap between the upper insulating piece 131A and the cover plate 110A to the gap between the cover plate 110A and the pole 120A, thereby forming a guide path between the cover plate 110A and the pole 120A, causing a short circuit of the battery.

[0024] In order to ensure the safety of the battery, an embodiment of the present application provides a top cover assembly 100. Referring to FIG. 2, FIG. 3, FIG. 5 and FIG. 6, FIG. 2 is a structural schematic diagram of the top cover assembly 100 provided by the embodiment of the present application, FIG. 3 is an enlarged schematic diagram of part A in FIG. 2, FIG. 5 is a structural schematic diagram of the top cover assembly 100 provided by the embodiment of the present application, and FIG. 6 is an enlarged schematic diagram of part B in FIG. 5. The top cover assembly 100 comprises a cover plate 110, a pole 120, an insulating assembly 130 and a seal 140 abutting between the pole 120 and the cover plate 110.

[0025] Among them, referring to FIG. 2, FIG. 5, FIG. 8 and FIG. 9, FIG. 8 is a structural schematic diagram of the cover plate 110 provided by the embodiment of the present application, and FIG. 9 is a top view of FIG. 8. The cover plate 110 has oppositely arranged cover plate upper and lower surfaces, and is provided with a pole hole 160 penetrating through the cover plate upper and lower surfaces, and the pole 120 is installed in the pole hole 160.

[0026] It is easy to understand that the pole hole 160 can be a positive pole hole or a negative pole hole, and correspondingly, the pole 120 can be a positive pole or a negative pole, and 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 comprises an upper insulating piece 131 installed on the cover plate upper surface and a lower insulating piece 132 installed on the cover plate lower surface, and the lower insulating piece 132 abuts between the pole 120 and the cover plate 110. The outer side of the seal 140 away from the pole comprises at least one stepped surface, and the seal 140 abuts between the upper insulating piece 131 and the lower insulating piece 132, and is pressed by the cover plate 110, the upper insulating piece 131 and the lower insulating piece 132 to be in a compressed state.

[0027] In the embodiment, the sealing member 140 is compressed by the cover plate 110, the upper insulating member 131 and the lower insulating member 132, so that the sealing member 140 is in a sealed state with 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 the cover plate 110 and the lower insulating member 132, the electrolyte is not easy to flow through the gap, so that the pole 120 is isolated from the electrolyte.

[0028] In some embodiments, the hardness of the sealing member 140 is 60HA to 85HA, and when the sealing member 140 is in a compressed state, the compression amount is 10% to 45%, wherein the compression amount is the ratio of the thickness of the compressed sealing member 140 to the original thickness of the sealing member 140.

[0029] For example, the original thickness of a sealing member 140 is 10mm, and the hardness of the material is 60HA, and the compressed thickness is 4.5mm, that is, the compression amount of the sealing member 140 is 45%. It is easy to understand that when a sealing member 140 of different material is selected, the range of the compression amount corresponding to the sealing member 140 will be different.

[0030] In the embodiment, the hardness of the material of the sealing member 140 is limited to 60HA to 85HA. When the hardness of the material of the sealing member 140 is within the range, the sealing member 140 is not easy to deform when the remaining components apply extrusion force to it, which makes the assembly of the components difficult. Also, when the hardness of the material of the sealing member 140 is within the range, the remaining components and the sealing member 140 cannot meet the required sealing requirement due to the softness of the material. When the hardness of the material of the sealing member 140 is within the range of 60HA to 85HA, the sealing performance between the remaining components and the sealing member 140 in the top cover assembly 100 is better after the installation of each component.

[0031] In some embodiments, the outer side surface of the sealing member 140 includes one or more stepped surfaces. In the present application, the stepped surface includes a first surface and a second surface connected by bending, so that the sealing member 140 forms a stepped structure. 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.

[0032] Specifically, referring to FIG. 2 and FIG. 3, the inner side of the sealing member 140 abuts against the side of the pole 120 in the vertical direction, and the outer side of the sealing member 140 is opposite to the inner side of the sealing member 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 between the first stepped surface 141 and the third stepped surface 143, the first stepped surface 141 abutting against the lower insulating member 132, the second stepped surface 142 abutting against the cover plate 110, and the third stepped surface 143 abutting against the upper insulating member 131.

[0033] In this embodiment, the sealing member 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 110, and the third stepped surface 143 abutting against the upper insulating member 131. In this case, the number of stepped surfaces of the sealing member 140 is large, and the dimensional accuracy requirement of the sealing member 140 is higher, so the processing difficulty of the sealing member 140 is higher, but because the third stepped surface 143 and the second stepped surface 142 are not in the same horizontal plane to form a height difference, even if the electrolyte flows from the gap between the cover plate 110 and the upper insulating part 210 onto the second stepped surface 142, the electrolyte on the second stepped surface 142 is also difficult to contact the pole 120 through the gap between the upper insulating part 210 and the third stepped surface 143, so that the sealing effect between the sealing member 140 of the top cover assembly 100 and the upper insulating member 131 and the lower insulating member 132 is better.

[0034] In some embodiments, referring to FIG. 3, the third stepped surface 143 includes a horizontal surface extending in the horizontal direction and an inclined surface inclinedly connected with the horizontal surface. In this embodiment, because the sealing member 140 is a resilient structure, through the connection structure of the horizontal surface and the inclined surface of the third stepped surface 143, when the horizontal surface in the third stepped surface 143 is extruded by the upper insulating member 131, the structure can make the volume of the compressed sealing member 140 expand in the direction of the inclined surface, so that the sealing of the inclined surface and the upper insulating member 131 is better. Thus, while ensuring that the sealing between the horizontal surface in the third stepped surface 143 and the upper insulating member 131 meets the required sealing, the sealing between the horizontal surface in the third stepped surface 143 and the upper insulating member 131 is also better. At the same time, this structure helps to form a kind of "wedge" or self-locking effect, when the extrusion force is applied, the inclined surface will promote the upper insulating member 131 and the sealing member 140 to be extruded more closely together, so as to enhance the sealing effect.

[0035] Specifically, referring to FIG. 5 and FIG. 6, the side of the sealing member 140 away from the pole 120 is provided with a stepped surface, i.e., the first stepped surface 141, which abuts against the lower insulating member 132, and the top surface of the sealing member 140 abuts against the cover plate 110 and the upper insulating member 131.

[0036] In this embodiment, since the sealing member 140 includes the first stepped surface 141 and the top surface which abut against the lower insulating member 132, in this case, the lower surface of the upper insulating part 210 is at the same level as the lower surface of the cover plate 110, i.e., there is no height difference, when the electrolyte flows from the gap between the upper insulating part 210 and the cover plate 110 to the top surface of the sealing member 140, there is a risk that the electrolyte will reach the pole 120 through the gap between the upper insulating part 210 and the sealing member 140, thereby causing a short circuit of the battery. However, the number of stepped surfaces of the sealing member 140 is small, so the processing difficulty of the sealing member 140 is low, which is convenient for production and processing.

[0037] It is easy to understand that, corresponding to the stepped surfaces, the upper insulating member 131 is provided with an upper recess 310 which fits the third stepped surface 143, and / or the lower insulating member 132 is provided with a lower recess 320 which fits the first stepped surface 141.

[0038] The upper insulating member 131 and / or the lower insulating member 132 are also provided with recesses which fit the stepped surfaces, so that after the installation of each component in the top cover assembly 100, the recesses of the upper insulating member 131 and / or the lower insulating member 132 can fit the corresponding stepped surfaces in the sealing member 140, and press the sealing member 140, so that a sealed state is formed between the upper insulating member 131 and / or the lower insulating member 132 and the sealing member 140, thereby ensuring that the pole 120 can be isolated from the electrolyte even if the electrolyte flows into the gap in the top cover assembly 100.

[0039] In some embodiments, the number of stepped surfaces of the sealing member 140 is less than or equal to 5.

[0040] When the number of step faces is greater than or equal to 1, the recesses on the upper insulating member 131 and / or the lower insulating member 132 can be matched with the step faces of the sealing member 140 when the upper insulating member 131 and the lower insulating member 132 press the sealing member 140, and the sealing effect between the upper insulating member 131, the lower insulating member 132 and the sealing member 140 is better with the increase of the number of step faces. However, according to experimental data, when the number of step faces of the sealing member 140 is set to be greater than 5, the sealing effect is not obviously improved with the increase of the number of step faces, and because the size of the sealing member 140 is small, the size precision of the sealing member 140 is required to be higher during processing, and the processing difficulty is also higher. Meanwhile, with the increase of the number of step faces, the corner of the step face is more likely to be damaged when pressed by the upper insulating member 131 and the lower insulating member 132. Therefore, the number of step faces of the sealing member 140 is limited to be less than or equal to 5, and in this case, the sealing effect between the upper insulating member 131, the lower insulating member 132 and the sealing member 140 can meet the requirements, and the processing difficulty is not high, and the corner of the step face is not easy to be damaged.

[0041] In some embodiments, the width of the second step face 142 is greater than the width of the first step face 141.

[0042] Referring to FIG. 3, the width d2 of the second step face 142 is greater than the width d1 of the first step face 141. Specifically, by setting the width of the second step face 142 to be greater than the width of the first step face 141, the second step face 142 has a larger contact area, and a larger contact area means that there is a larger surface friction when the lower surface of the cover plate abuts against the second step face 142 of the sealing member 140, thereby increasing the stability and sealing between the cover plate 110 and the sealing member 140.

[0043] In some embodiments, referring to FIGS. 2-5, the upper surface of the cover plate is provided with a boss 111 surrounding the pole hole 160, and the upper insulating member 131 further includes an upper mounting portion 220 provided with a recess to accommodate the boss 111.

[0044] In this embodiment, the upper surface of the cover plate is provided with a boss 111 surrounding the pole hole 160, and the upper insulating member 131 further includes an upper mounting portion 220 provided with a recess to accommodate 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, and 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 pass through the gap between the upper insulating member 131 and the cover plate 110 to reach the pole 120, thereby reducing the risk of battery short circuit caused by the electrolyte easily passing through the gap.

[0045] In some embodiments, please refer to FIG. 2 to FIG. 5. The top cover assembly 100 further comprises a conductive connecting piece 150 connected to the outer side of the pole 120, the upper insulating piece 131 further comprises an upper body part 230, and the upper body part 230 is clamped to the outer side of the conductive connecting piece 150.

[0046] Specifically, the upper insulating piece 131 in the embodiment comprises an upper body part 230, and the upper body part 230 is bent away from one end of the sealing piece 140 and clamped to the outer side of the conductive connecting piece 150. In the related art, the upper insulating piece 131 abuts against the conductive connecting piece 150, but the one end of the upper insulating piece 131 away from the sealing piece 140 is not bent, so the risk of electrolyte flowing to the pole 120 through the gap between the upper body part 230 and the conductive connecting piece 150 is greater. In the embodiment, by setting the one end of the upper body part 230 away from the sealing piece 140 to be bent and clamped to the outer side of the conductive connecting piece 150, the distance of electrolyte flowing to the pole 120 through the gap between the upper body part 230 and the conductive connecting piece 150 is increased, and the risk of electrolyte flowing to the pole 120 through the gap between the upper body part 230 and the conductive connecting piece 150 is reduced.

[0047] In some embodiments, please refer to FIG. 9 to FIG. 7. The width of the boss 111 is D, the width of the conductive connecting piece 150 is L, and the width of the cover plate 110 is M; wherein 0.8mm≤D≤M / 2-L / 2-1.8mm.

[0048] From the experimental data, when the width D of the boss 111 is less than 0.8mm, the processing difficulty is higher and the manufacturability is lower. When the width D of the boss 111 is greater than M / 2-L / 2-1.8mm, the width of the boss 111 is larger, and since the upper insulating piece 131 is provided with the recessed upper mounting part 220 to accommodate the boss 111, the length of the upper mounting part 220 of the upper insulating piece 131 will also increase, thereby increasing the production cost. When the width D of the boss 111 is greater than or equal to 0.8mm and less than or equal to M / 2-L / 2-1.8mm, the processing difficulty of the boss 111 and the production cost of the upper insulating piece 131 are both lower, and the sealing requirement of the top cover assembly 100 can also be met.

[0049] In some embodiments, please refer to FIG. 4 and FIG. 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+0.8mm≤T≤M / 2-1mm.

[0050] It can be known from the experimental data that when the distance T between the side of the boss 111 close to the pole column 120 and the center of the pole column hole 160 is less than L / 2+0.8 mm, the distance between the boss 111 and the side of the pole column 120 is close, which affects the thickness of the upper insulating piece 131 and the size of the conductive connecting piece 150, and causes the structural strength of the upper insulating piece 131 and the conductive connecting piece 150 to be general. When the distance T between the side of the boss 111 close to the pole column 120 and the center of the pole column hole 160 is greater than M / 2-1 mm, the distance between the boss 111 and the side of the pole column 120 is far, which causes the length of the upper mounting portion 220 of the upper insulating piece 131 configured to accommodate the boss 111 to be long, thereby increasing the production cost. When the distance T between the side of the boss 111 close to the pole column 120 and the center of the pole column hole 160 is 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 the side of the pole column 120 is moderate, which can ensure that the structural strength of the upper insulating piece 131 and the conductive connecting piece 150 is high, and can also reduce the production cost of the upper insulating piece 131.

[0051] The top cover assembly 100 provided by the embodiment of the present application comprises a cover plate 110, a pole column 120, an insulating assembly 130, and a sealing piece 140 between the pole column 120 and the cover plate 110. The cover plate 110 has oppositely arranged upper and lower surfaces of the cover plate 110, and the cover plate 110 is further provided with a pole column hole 160 penetrating through the upper and lower surfaces of the cover plate 110, and the pole column 120 is installed in the pole column hole 160. The insulating assembly 130 comprises an upper insulating piece 131 installed on the upper surface of the cover plate 110 and a lower insulating piece 132 installed on the lower surface of the cover plate 110, and the upper insulating piece 131 comprises an upper insulating portion 210 between the pole column 120 and the cover plate 110, and the lower insulating piece 132 abuts between the pole column 120 and the cover plate 110. The sealing piece 140 abuts between the upper insulating piece 131 and the lower insulating piece 132, and is compressed by the cover plate 110, the upper insulating piece 131, and the lower insulating piece 132 to be in a compressed state. The sealing piece 140 forms a sealed state with the cover plate 110, the upper insulating piece 131, and the lower insulating piece 132, so that even if the electrolyte flows into the gap in the top cover assembly 100, the pole column 120 can be isolated from the electrolyte.

[0052] The battery pack provided by the embodiment of the present application comprises a plurality of top cover assemblies 100. The battery pack comprises a plurality of battery monomers, and each top cover assembly 100 is arranged to encapsulate and protect a corresponding battery monomer. The battery pack provided by the embodiment of the present application has all the advantages of the top cover assembly 100, which will not be described here.

[0053] The application further provides a power utilization device comprising the battery pack.

[0054] The sealing member in the power utilization device is abutted between the upper insulating member and the lower insulating member of the insulating assembly, is pressed and is in a compressed state, the sealing performance between the cover plate and the pole is strengthened, and thus the safety of the battery is ensured.

Claims

1. A cap assembly comprising: A cover plate having a cover plate upper surface and a cover plate lower surface oppositely arranged, and provided with a pole post hole penetrating through the cover plate upper surface and the cover plate lower surface; A pole post installed in the pole post hole; an insulation assembly including an upper insulation member and a lower insulation member, the upper insulation member being installed on the cover plate upper surface, the lower insulation member being installed on the cover plate lower surface and abutting between the pole post and the cover plate; and a sealing member abutting between the pole post and the cover plate; wherein an outer side of the sealing member away from the pole post includes at least one step surface, and the sealing member also abuts between the upper insulation member and the lower insulation member to be squeezed into a compressed state.

2. The roof assembly of claim 1, wherein, The sealing member has a hardness of 60HA to 85HA, and a compression amount of the sealing member ranges from 10% to 45%, the compression amount being a ratio of a thickness of the sealing member after compression to an original thickness of the sealing member.

3. The roof assembly of claim 1, wherein, The number of the step surfaces is less than or equal to 5.

4. The roof assembly of claim 1, wherein, The plurality of step surfaces include a first step surface close to the lower insulation member, a third step surface close to the upper insulation member, and a second step surface between the first step surface and the third step surface, the first step surface abutting the lower insulation member, the second step surface abutting the cover plate, and the third step surface abutting the upper insulation member.

5. The roof assembly of claim 4, wherein, 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 roof assembly of claim 4, wherein, The second step surface has a width greater than that of the first step surface.

7. The roof assembly of claim 1, wherein, The outer side of the sealing member includes one step surface abutting the lower insulation member, and a top surface of the sealing member abutting the cover plate and the upper insulation member.

8. The top cover assembly of claim 1, further comprising a conductive connecting member connected to an outer side of the pole post, and the upper insulation member further comprises an upper body portion clamped to an outer side of the conductive connecting member.

9. The roof assembly of claim 8, wherein, The protrusion has a width D, the conductive connecting member has a width L, and the cover plate has a width M; wherein 0.8mm≤D≤M / 2-L / 2-1.8mm.

10. The roof assembly of claim 9, wherein, A distance between a side of the protrusion close to the pole post and a center of the pole post hole is T; wherein L / 2+0.8mm≤T≤M / 2-1mm.

11. The roof assembly of claim 10, wherein, The upper mounting portion is connected to an outer side of the upper body portion, the upper insulation member includes an upper insulation portion abutting between the pole post and the cover plate, the upper insulation portion being connected to one end of the upper body portion in a bent manner, and the other end of the upper body portion being clamped to an outer side of the conductive connecting member.

12. A battery pack comprising a plurality of top cover assemblies according to any one of claims 1-11.

13. An electrical device comprising the battery pack of claim 12.

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