Battery cover plate assembly and lithium ion battery

Abstract

This invention provides a battery cover assembly and a lithium-ion battery. The battery cover assembly includes a cover plate, an electrode assembly, and a thermal radiation coating. The thermal radiation coating includes a first thermal radiation coating and a second thermal radiation coating. The electrode assembly includes an upper electrode plate and an insulating seal. The upper electrode plate has an electrode mounting area and a first coating area on the side facing the cover plate. The insulating seal is located between the electrode mounting area and the cover plate. The first coating area faces the cover plate, and the cover plate has a second coating area on the side facing the upper electrode plate. The first and second coating areas are spaced apart from each other. The first thermal radiation coating is applied to the surface of the first coating area, and the second thermal radiation coating is applied to the surface of the second coating area. The battery cover assembly provided by this invention establishes a heat transfer channel between the electrode plate and the cover plate through the first and second thermal radiation coatings, optimizing the battery heat dissipation path and thus improving the overall heat dissipation efficiency of the lithium-ion battery.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery cover assembly and a lithium-ion battery. Background Technology

[0002] In the field of lithium-ion batteries, with the booming development of the new energy industry, the application scenarios of lithium-ion batteries are constantly expanding, from consumer electronics to electric vehicles and energy storage systems. The requirements for the performance and safety of lithium-ion batteries are becoming increasingly stringent. As a key component of lithium-ion batteries, the heat dissipation of the top cover plate and terminals has become a significant factor affecting the overall performance and safety of the battery.

[0003] Lithium-ion batteries generally consist of a cover assembly, a casing, and battery cells. The cover assembly and casing form a space to house the battery cells. The cover assembly has a complex structure, including components such as terminals, insulating plastic, terminal plates, and the cover itself. During battery operation, a large current flows through the terminals, causing them to generate high temperatures. If this heat cannot be dissipated in time, it will accumulate inside the battery, affecting the internal chemical reaction balance, accelerating battery aging, reducing battery life, and even causing safety accidents such as thermal runaway.

[0004] From the perspective of existing heat dissipation networks for lithium-ion batteries, although the terminals have achieved metal connection and the cover plate assembly can also achieve metal connection after assembly with the casing, an effective thermal conductivity network has not been formed between the terminal plate and the cover plate in the cover plate assembly. This defect hinders the heat generated by the cell from the terminals to the cover plate and then to the casing, thus affecting the heat dissipation effect of the lithium-ion battery. Utility Model Content

[0005] The technical problem to be solved by this utility model is to address the issue that lithium-ion batteries in the prior art cannot form an efficient heat dissipation network, and to provide a battery cover assembly and a lithium-ion battery.

[0006] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:

[0007] A battery cover assembly is provided, including a cover, an electrode assembly, and a thermal radiation coating, wherein the thermal radiation coating includes a first thermal radiation coating and a second thermal radiation coating.

[0008] The electrode assembly includes an upper electrode plate and an insulating seal. The upper electrode plate has an electrode mounting area and a first coating area on the side facing the cover plate. The insulating seal is disposed between the electrode mounting area and the cover plate. The first coating area faces the cover plate. The cover plate has a second coating area on the side facing the upper electrode plate. The first coating area and the second coating area are spaced apart from each other. A first thermal radiation coating is disposed on the surface of the first coating area, and a second thermal radiation coating is disposed on the surface of the second coating area.

[0009] Optionally, the pole assembly further includes an insulating and thermally conductive support, which includes a first insulating and thermally conductive support and a second insulating and thermally conductive support. The first insulating and thermally conductive support is disposed at one end of the upper pole plate and abuts against the upper pole plate and the cover plate, respectively. The second insulating and thermally conductive support is disposed at the other end of the upper pole plate and abuts against the upper pole plate and the cover plate, respectively.

[0010] Optionally, it also includes an explosion-proof valve hole, which is located on the end of the cover plate away from the second insulating thermally conductive support.

[0011] Optionally, it also includes a liquid injection hole, which is located at one end of the cover plate away from the second insulating thermally conductive support.

[0012] Optionally, the electrode assembly further includes an electrode post that passes sequentially through the cover plate and the insulating seal and is connected to the upper electrode post plate.

[0013] Optionally, the electrode assembly further includes an insulating plastic component and a lower electrode plate. The lower electrode plate is located on the side of the cover plate opposite to the upper electrode plate. The insulating plastic component is located between the lower electrode plate and the cover plate. The electrode passes through the insulating plastic component, the cover plate, and the insulating seal in sequence and connects the upper electrode plate and the lower electrode plate.

[0014] Optionally, a first pole mounting hole is provided on the pole mounting area, and the end of the pole is inserted into and welded to the first pole mounting hole.

[0015] Optionally, a second pole mounting hole is provided on the cover plate corresponding to the position of the first pole mounting hole, a third pole mounting hole is provided on the insulating seal corresponding to the position of the first pole mounting hole, and a fourth pole mounting hole is provided on the insulating plastic part corresponding to the position of the first pole mounting hole.

[0016] The electrode passes through the first electrode mounting hole, the second electrode mounting hole, the third electrode mounting hole, and the fourth electrode mounting hole.

[0017] Optionally, the battery cover assembly includes two terminal post assemblies, the upper terminal post plates of the two terminal post assemblies extending from the ends of the cover plate toward the center of the cover plate, and the two terminal post assemblies are spaced apart.

[0018] An explosion-proof valve hole is provided at the center of the cover plate, and the upper pole plate of the two pole plate assemblies is located near the explosion-proof valve hole on the side away from the end of the cover plate.

[0019] One of the electrode assembly has an injection hole on its upper electrode plate, which penetrates the upper electrode plate.

[0020] On the other hand, this application provides a lithium-ion battery, including the aforementioned battery cover assembly.

[0021] The beneficial effects of this utility model are as follows:

[0022] In the battery cover assembly provided in this application, a first thermal radiation coating is provided on the side of the upper electrode plate of the electrode assembly facing the cover, and a second thermal radiation coating is provided on the side of the cover plate facing the electrode plate. The first and second thermal radiation coatings are spaced apart from each other. The thermal radiation effect of the thermal radiation coatings establishes a heat transfer channel between the electrode plate and the cover, allowing the heat generated by the electrode to be transferred to the cover through the thermal radiation coating, and then to the casing. This compensates for the deficiencies of existing heat dissipation networks and optimizes the heat dissipation path of the battery. In addition, compared with a cover assembly without a thermal radiation coating, where heat is conducted only through the limited contact area between the electrode and the cover assembly, the thermal radiation coating provided in this application, through its excellent thermal radiation performance, can quickly transfer the heat generated by the electrode to the cover through thermal radiation. This increases the heat dissipation area and heat dissipation method, accelerates the heat transfer speed from the electrode to the cover, thereby improving the overall heat dissipation efficiency of the lithium-ion battery and reducing the accumulation of heat inside the battery. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the battery cover assembly structure provided in one embodiment of the present invention;

[0024] Figure 2 It is an exploded view of 1;

[0025] Figure 3 This is a cross-sectional structural diagram of 1;

[0026] Figure 4 This is a schematic diagram of the battery cover assembly structure provided in another embodiment of the present invention;

[0027] Figure 5 This is a schematic diagram of the cross-sectional structure of 4;

[0028] Figure 6This is a schematic diagram of the battery cover assembly structure provided in another embodiment of the present invention;

[0029] Figure 7 It is an exploded diagram of number 6;

[0030] Figure 8 This is a schematic diagram of the cross-sectional structure of 7.

[0031] The reference numerals in the accompanying drawings are as follows:

[0032] 1. Cover plate; 2. Pole post assembly; 21. Upper pole post plate; 22. Insulating seal; 23. Insulating thermally conductive support; 231. First insulating thermally conductive support; 232. Second insulating thermally conductive support; 3. Thermal radiation coating; 31. First thermal radiation coating; 32. Second thermal radiation coating; 4. Pole post mounting area; 5. First coating area; 6. Second coating area; 7. Explosion-proof valve hole; 8. Injection hole; 9. First pole post mounting hole; 10. Second pole post mounting hole; 11. Third pole post mounting hole; 12. Fourth pole post mounting hole; 13. Pole post; 14. Insulating plastic part; 15. Lower pole post plate. Detailed Implementation

[0033] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0034] In the description of this utility model, it should be understood that the terms "longitudinal," "radial," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0035] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0036] This utility model provides a battery cover assembly, including a cover 1, an electrode assembly 2 and a thermal radiation coating 3, wherein the thermal radiation coating 3 includes a first thermal radiation coating 31 and a second thermal radiation coating 32.

[0037] The electrode assembly 2 includes an upper electrode plate 21 and an insulating seal 22. The upper electrode plate 21 has an electrode mounting area 4 and a first coating area 5 on the side facing the cover plate 1. The insulating seal 22 is disposed between the electrode mounting area 4 and the cover plate 1. The first coating area 5 faces the cover plate 1. The cover plate 1 has a second coating area 6 on the side facing the upper electrode plate 21. The first coating area 5 and the second coating area 6 are spaced apart from each other. The first thermal radiation coating 31 is disposed on the surface of the first coating area 5, and the second thermal radiation coating 32 is disposed on the surface of the second coating area 6.

[0038] Specifically, in the battery cover assembly provided in this application, a first thermal radiation coating 31 is provided on the side of the upper electrode plate 21 of the electrode assembly 2 facing the cover plate 1, and a second thermal radiation coating 32 is provided on the side of the cover plate 1 facing the electrode plate 13. The first thermal radiation coating 31 and the second thermal radiation coating 32 are spaced apart from each other. A heat transfer channel is established between the electrode plate 13 and the cover plate 1 through the thermal radiation coating 3, so that the heat generated by the electrode 13 can be transferred to the cover plate 1 through the thermal radiation coating 3, and then to the casing. This makes up for the shortcomings of the existing heat dissipation network and optimizes the heat dissipation path of the battery. In addition, compared with the cover assembly without the thermal radiation coating 3, the heat is only conducted through the limited contact area between the electrode 13 and the cover assembly. The thermal radiation coating 3 in this application can quickly transfer the heat generated by the electrode 13 to the cover plate 1 through thermal radiation by means of its own good thermal radiation performance. This increases the heat dissipation area and heat dissipation method, accelerates the heat transfer speed from the electrode 13 to the cover plate 1, thereby improving the heat dissipation efficiency of the entire lithium-ion battery and reducing the accumulation of heat inside the battery.

[0039] In one embodiment, the pole assembly 2 further includes an insulating and thermally conductive support 23, which includes a first insulating and thermally conductive support 231 and a second insulating and thermally conductive support 232. The first insulating and thermally conductive support 231 is disposed at one end of the upper pole plate 21 and abuts against the upper pole plate 21 and the cover plate 1 respectively. The second insulating and thermally conductive support 232 is disposed at the other end of the upper pole plate 21 and abuts against the upper pole plate 21 and the cover plate 1 respectively.

[0040] Specifically, on the one hand, the first insulating thermally conductive support 231 and the second insulating thermally conductive support 232 are respectively disposed at both ends of the upper electrode plate 21 and abut against the upper electrode plate 21 and the cover plate 1, which plays the role of supporting the upper electrode plate 21 and the cover plate 1, enhancing the structural stability of the battery cover plate assembly, ensuring that the heat conduction path between the upper electrode plate 21 and the cover plate 1 always maintains a good contact state, and is not affected by factors such as vibration and compression during the use of lithium-ion batteries, thus ensuring the reliability of heat conduction and heat dissipation, making the heat dissipation effect more stable and lasting.

[0041] On the other hand, since the insulating thermally conductive support 23 is in contact with the upper electrode plate 21 and the cover plate 1 respectively, heat can also be conducted through the insulating thermally conductive support 23, which can transfer the heat from different positions on the upper electrode plate 21 to the cover plate 1 more evenly, avoiding the accumulation of heat in local areas of the upper electrode plate 21, making the overall temperature distribution of the cover plate 1 more balanced, which in turn helps to maintain the consistency of temperature in various areas inside the battery. The combination of multiple heat dissipation methods further improves the heat transfer efficiency from the electrode plate 13 to the cover plate 1, and extends the overall service life of the battery.

[0042] Reference Figure 1-3 In one embodiment, it further includes an explosion-proof valve hole 7, which is disposed on the end of the cover plate 1 away from the second insulating thermally conductive support member 232.

[0043] Specifically, as in this application Figure 1-3 The battery cover assembly can be assembled as a cover assembly for the positive electrode of a lithium battery.

[0044] In this embodiment, the explosion-proof valve hole 7 is located on the end of the cover plate 1 away from the second insulating thermally conductive support 232, which avoids the impact and damage to the second insulating thermally conductive support 232 during the pressure relief process, ensuring that the second insulating thermally conductive support 232 can continuously and stably perform its heat dissipation function, and further ensuring battery safety.

[0045] Since the explosion-proof valve hole 7 is far away from the second insulating thermally conductive support 232, during the heat dissipation process, the second insulating thermally conductive support 232 can stably transfer heat to the cover plate 1 while playing a supporting role, and will not be affected by factors such as gas leakage or pressure fluctuations that may exist in the explosion-proof valve hole 7, thus helping to improve the overall performance and reliability of the lithium-ion battery.

[0046] Reference Figure 4-5 In one embodiment, it further includes a liquid injection hole 8, which is disposed on the end of the cover plate 1 away from the second insulating thermally conductive support member 232.

[0047] Specifically, as in this application Figure 4-5As shown, the injection hole 8 can be located at the end of the cover plate 1 away from the second insulating thermally conductive support 232, and Figure 4-5 The battery cover assembly shown can be assembled as a cover assembly for the negative electrode of a lithium-ion battery.

[0048] When Figure 4-5 When the cover plate assembly shown is assembled with the negative electrode of the lithium-ion battery, the reasonable arrangement of the liquid injection hole 8 and the second insulating and thermally conductive support 232 can make more efficient use of the internal space of the lithium-ion battery. During the battery assembly process, the connection lines and fixing structure can be arranged more conveniently, thereby improving the overall integration and stability of the battery.

[0049] In one embodiment, the pole assembly 2 further includes a pole 13, which passes through the cover plate 1 and the insulating seal 22 in sequence and is connected to the upper pole plate 21.

[0050] Specifically, the terminal post 13, as a key conductive component of the battery, generates a large amount of heat during battery operation. The terminal post 13 passes through the cover plate 1 and the insulating seal 22 in sequence and connects to the upper terminal plate 21, so that the heat generated by the terminal post 13 can be directly transferred to the upper terminal plate 21 through itself. Combined with the insulating thermally conductive support 23 and the first thermal radiation coating 31 on the upper terminal plate 21, the heat can be further and quickly transferred to the cover plate 1, and then to the shell, forming an efficient heat conduction path from the terminal post to the upper terminal plate to the cover plate to the shell, which effectively shortens the heat transfer distance, improves heat dissipation efficiency, and reduces the accumulation of heat inside the battery.

[0051] Furthermore, the insulating seal 22 ensures electrical insulation between the terminal post 13 and the cover plate 1, while also providing a seal for the installation of the terminal post 13, preventing electrolyte leakage inside the battery. The terminal post 13 passes through the insulating seal 22 and connects to the terminal plate 21, ensuring effective heat conduction while maintaining electrical insulation. This design, while meeting the battery's electrical safety requirements, also addresses heat dissipation needs, achieving a good balance between electrical insulation and heat dissipation, thus ensuring the normal operation and safety of the battery.

[0052] The terminal post 13 passes sequentially through the cover plate 1 and the insulating seal 22 and connects to the upper terminal plate 21. This connection method enhances the structural stability between the terminal post assembly 2 and the cover plate 1, ensuring that the relative positions of the terminal post 13, the upper terminal plate 21, and the cover plate 1 remain unchanged during battery use. This ensures that the heat conduction path maintains good contact and is unaffected by factors such as battery vibration and compression. This improves the reliability of heat dissipation, making the heat dissipation effect more stable and durable, which is beneficial to improving the overall performance and lifespan of the lithium-ion battery.

[0053] In one embodiment, the electrode assembly 2 further includes an insulating plastic part 14 and a lower electrode plate 15. The lower electrode plate 15 is located on the side of the cover plate 1 opposite to the upper electrode plate 21. The insulating plastic part 14 is located between the lower electrode plate 15 and the cover plate 1. The electrode 13 passes through the insulating plastic part 14, the cover plate 1 and the insulating seal 22 in sequence and connects the upper electrode plate 21 and the lower electrode plate 15.

[0054] Specifically, the terminal post 13 passes sequentially through the insulating plastic part 14, the cover plate 1, and the insulating seal 22, connecting the upper terminal plate 21 and the lower terminal plate 15. This further enriches the heat conduction path inside the battery. The heat generated by the terminal post 13 can not only be transferred to the cover plate 1 and the shell through the upper terminal plate 21, the thermal radiation coating 3, and the insulating thermally conductive support 23, but also be conducted to the lower terminal plate 15 through the terminal post 13. The lower terminal plate 15 can disperse the heat to other surrounding areas. In conjunction with other heat dissipation structures, it forms a more complete heat conduction system, enabling the heat to be dissipated more comprehensively and efficiently, improving the overall heat dissipation capacity of the battery, and effectively reducing the internal temperature of the battery.

[0055] An insulating plastic component 14 is disposed between the lower electrode plate 15 and the cover plate 1, providing reliable electrical insulation between the lower electrode plate 15 and the cover plate 1. At the same time, combined with the insulating seal 22 between the electrode 13 and the cover plate 1, a multi-layered insulating protection structure is formed, which avoids short circuits between different conductive structural components, ensuring the electrical safety of the battery. Furthermore, good insulation performance also helps maintain the stability of the internal electric field of the battery, reducing the battery performance degradation caused by electrical problems, and indirectly having a positive impact on the heat dissipation of the battery, because stable electrical performance can reduce unnecessary heat generation.

[0056] In one embodiment, a first pole mounting hole 9 is provided on the pole mounting area 4, and the end of the pole 13 is inserted into and welded to the first pole mounting hole 9.

[0057] Specifically, the end of the electrode post 13 is inserted into and welded to the first electrode post mounting hole 9. Due to the welding, the contact area between the electrode post 13 and the electrode post 13 mounting hole is increased and the contact is tight, and the thermal resistance is significantly reduced. When the electrode post 13 generates heat, the heat can be transferred more efficiently to the heat conduction area of ​​the upper electrode plate 21 through the welding part, and then transferred to the cover plate 1 through the first thermal radiation coating 31 of the first coating area 5, thereby achieving heat dissipation and reducing the adverse effects of high temperature on battery performance and life.

[0058] In one embodiment, the cover plate 1 is provided with a second pole mounting hole 10 corresponding to the position of the first pole mounting hole 9, the insulating seal 22 is provided with a third pole mounting hole 11 corresponding to the position of the first pole mounting hole 9, and the insulating plastic part 14 is provided with a fourth pole mounting hole 12 corresponding to the position of the first pole mounting hole 9.

[0059] The pole post 13 passes through the first pole post mounting hole 9, the second pole post mounting hole 10, the third pole post mounting hole 11, and the fourth pole post mounting hole 12.

[0060] Specifically, the electrode post 13 smoothly passes through each mounting hole and is tightly connected to the upper electrode plate 21, creating a smooth path for heat transfer. When the electrode post 13 generates heat, the heat can be efficiently conducted from the electrode post 13 to the first coating area 5 of the upper electrode plate 21, which is provided with a first thermal radiation coating 31, and then transferred to the cover plate 1 through the first thermal radiation coating 31. The cover plate 1 is also provided with a second thermal radiation coating 32, thus establishing a heat transfer channel between the electrode post 13 and the cover plate 1. The precise alignment of the mounting holes of each component ensures good contact between the electrode post 13 and other structural components, reduces thermal resistance, and optimizes the heat dissipation path.

[0061] The third and fourth terminal mounting holes 12 on the insulating seal 22 and the insulating plastic part 14, combined with their own insulation properties, provide double insulation protection for the terminal 13. The insulating seal 22 prevents electrical conduction between the terminal 13 and the cover, avoiding the risk of leakage; the insulating plastic part 14 further isolates the current between the lower terminal plate 15 and the cover plate 1. This double protection effectively avoids internal short circuits in the battery, significantly improves the battery's electrical insulation performance, enhances battery safety during use, and reduces the possibility of electrical faults causing safety accidents.

[0062] Reference Figure 6-8 In one embodiment, the battery cover assembly includes two terminal post assemblies 2, the upper terminal post plates 21 of the two terminal post assemblies 2 extending from the ends of the cover 1 toward the center of the cover 1, and the two terminal post assemblies 2 are spaced apart.

[0063] An explosion-proof valve hole 7 is provided at the center of the cover plate 1, and the upper pole plate 21 of the two pole components 2 is located near the explosion-proof valve hole 7 on the side away from the end of the cover plate 1.

[0064] One of the electrode assembly 2 has an injection hole 8 on its upper electrode plate 21, which penetrates the upper electrode plate 21.

[0065] Specifically, the upper electrode plates 21 of the two electrode post groups 13 extend from the end of the cover plate 1 towards the center and are spaced apart, thus increasing the heat dissipation area. During operation, the heat generated by the electrode post 13 can be transferred to the cover plate 1 through the first thermal radiation coating 31 of the upper electrode plate 21 and the insulating thermally conductive support 23. The second thermal radiation coating 32 on the cover plate 1 and the first thermal radiation coating 31 of the upper electrode plate 21, along with other heat dissipation areas, work together to accelerate the heat dissipation rate. The upper electrode plate 21 is located near the explosion-proof valve hole 7, and the area around the explosion-proof valve hole 7 dissipates heat quickly, forming good heat dissipation convection, further improving the overall heat dissipation efficiency and ensuring stable battery operation.

[0066] The operation of setting the explosion-proof valve hole 7 in the center of the cover plate 1 can release pressure in time when the internal pressure of the battery rises abnormally; the upper electrode plate 21 of the electrode assembly 2 is close to the explosion-proof valve hole 7, and the heat concentration area is close to the pressure relief channel. When local overheating and pressure increase due to heat dissipation problems, the explosion-proof valve hole 7 can respond quickly, release pressure, reduce safety risks, and enhance battery safety performance.

[0067] In another embodiment of this application, a lithium-ion battery is provided, including the aforementioned battery cover assembly.

[0068] Specifically, the lithium-ion battery uses the battery cover assembly provided in this application. In the battery cover assembly provided in this application, a first thermal radiation coating 31 is provided on the side of the upper electrode plate 21 of the electrode assembly 2 facing the cover plate 1, and a second thermal radiation coating 32 is provided on the side of the cover plate 1 facing the electrode plate 13. This arrangement expands the area of ​​thermal radiation, so that the heat generated inside the battery can be radiated to the outside through a larger area.

[0069] The upper electrode plate 21 contacts the electrode 13 inside the lithium-ion battery. The first thermal radiation coating 31 can efficiently emit the heat absorbed by the upper electrode plate 21 in the form of thermal radiation. At the same time, the second thermal radiation coating 32 on the cover plate 1 can also radiate the heat absorbed by the cover plate 1 outward. The two work together from different positions to enhance the thermal radiation capability of the entire battery cover plate assembly and improve the heat dissipation effect.

[0070] Since the first coating area 5 and the second coating area 6 are spaced apart, a specific thermal radiation channel is formed between the first thermal radiation coating 31 and the second thermal radiation coating 32. The heat inside the battery is transferred from the heat source to the upper electrode plate 21, and then emitted by the first thermal radiation coating 31. Some of the heat is directly transferred to the second thermal radiation coating 32 on the cover plate 1 through the thermal radiation channel, and then radiated to the outside by the second thermal radiation coating 32. The formation of this thermal radiation channel allows the heat to be transferred and dissipated more orderly, reducing the accumulation of heat inside the battery and improving the efficiency and effect of heat dissipation.

[0071] The first thermal radiation coating 31 and the second thermal radiation coating 32 work together to effectively dissipate heat from different locations inside the battery, resulting in a more uniform temperature distribution. The first thermal radiation coating 31 dissipates heat around the upper electrode plate 21, preventing excessive temperature around the electrode post 13. The second thermal radiation coating 32 dissipates heat from the cover plate 1 as a whole, preventing localized overheating. Through this synergistic effect, the overall temperature of the battery can be better controlled, improving battery performance and safety, and extending battery life. The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A battery cover assembly, characterized in that, It includes a cover plate (1), an electrode assembly (2), and a thermal radiation coating (3), wherein the thermal radiation coating (3) includes a first thermal radiation coating (31) and a second thermal radiation coating (32); The pole assembly (2) includes an upper pole plate (21) and an insulating seal (22). The upper pole plate (21) has a pole mounting area (4) and a first coating area (5) on the side facing the cover plate (1). The insulating seal (22) is disposed between the pole mounting area (4) and the cover plate (1). The first coating area (5) faces the cover plate (1). The cover plate (1) has a second coating area (6). The second coating area (6) is disposed on the side of the cover plate (1) facing the upper pole plate (21). The first coating area (5) and the second coating area (6) are spaced apart from each other. The first thermal radiation coating (31) is disposed on the surface of the first coating area (5), and the second thermal radiation coating (32) is disposed on the surface of the second coating area (6).

2. The battery cover assembly according to claim 1, characterized in that, The pole assembly (2) further includes an insulating and thermally conductive support (23), which includes a first insulating and thermally conductive support (231) and a second insulating and thermally conductive support (232). The first insulating and thermally conductive support (231) is disposed at one end of the upper pole plate (21) and abuts against the upper pole plate (21) and the cover plate (1) respectively. The second insulating and thermally conductive support (232) is disposed at the other end of the upper pole plate (21) and abuts against the upper pole plate (21) and the cover plate (1) respectively.

3. The battery cover assembly according to claim 2, characterized in that, It also includes an explosion-proof valve hole (7), which is located on the cover plate (1) at one end away from the second insulating thermally conductive support (232).

4. The battery cover assembly according to claim 2, characterized in that, It also includes an injection hole (8), which is located on the cover plate (1) at one end away from the second insulating thermally conductive support (232).

5. The battery cover assembly according to claim 1, characterized in that, The pole assembly (2) further includes a pole (13), which passes through the cover plate (1) and the insulating seal (22) in sequence and is connected to the upper pole plate (21).

6. The battery cover assembly according to claim 5, characterized in that, The pole assembly (2) further includes an insulating plastic part (14) and a lower pole plate (15). The lower pole plate (15) is located on the side of the cover plate (1) away from the upper pole plate (21). The insulating plastic part (14) is located between the lower pole plate (15) and the cover plate (1). The pole (13) passes through the insulating plastic part (14), the cover plate (1) and the insulating seal (22) in sequence and connects the upper pole plate (21) and the lower pole plate (15).

7. The battery cover assembly according to claim 6, characterized in that, The pole mounting area (4) is provided with a first pole mounting hole (9), and the end of the pole (13) is inserted into and welded to the first pole mounting hole (9).

8. The battery cover assembly according to claim 7, characterized in that, The cover plate (1) is provided with a second pole mounting hole (10) corresponding to the first pole mounting hole (9), the insulating seal (22) is provided with a third pole mounting hole (11) corresponding to the first pole mounting hole (9), and the insulating plastic part (14) is provided with a fourth pole mounting hole (12) corresponding to the first pole mounting hole (9). The pole (13) passes through the first pole mounting hole (9), the second pole mounting hole (10), the third pole mounting hole (11), and the fourth pole mounting hole (12).

9. The battery cover assembly according to claim 1, characterized in that, The battery cover assembly includes two electrode post assemblies (2), the upper electrode post plates (21) of the two electrode post assemblies (2) extend from the end of the cover plate (1) toward the center of the cover plate (1), and the two electrode post assemblies (2) are spaced apart; An explosion-proof valve hole (7) is provided at the center of the cover plate (1), and the upper pole plate (21) of the two pole post assemblies (2) is located near the explosion-proof valve hole (7) on the side away from the end of the cover plate (1). One of the electrode assembly (2) has an injection hole (8) on its upper electrode plate (21), and the injection hole (8) penetrates the upper electrode plate (21).

10. A lithium-ion battery, characterized in that, Includes the battery cover assembly as described in any one of claims 1-9.

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