Battery cover plate assembly and lithium ion battery

Abstract

The utility model provides a kind of battery cover plate assembly and lithium ion battery, the battery cover plate assembly includes cover plate and pole post assembly, the pole post assembly includes upper pole post plate, insulating seal and insulating heat conduction structure, the upper pole post plate includes pole post installation area and heat conduction area, the insulating seal is arranged between the pole post installation area and the cover plate, and the insulating heat conduction structure is arranged between the heat conduction area and the cover plate.The battery cover plate assembly provided by the utility model, insulating heat conduction structure is arranged between heat conduction area and cover plate, and heat conduction structure guides heat from heat conduction area to cover plate, so that the heat generated by pole post when battery operates can be quickly transmitted to cover plate through heat conduction area, thereby playing the role of efficient heat dissipation, improving the overall heat dissipation efficiency of lithium ion battery, which is conducive to further improving the service life of lithium ion battery and ensuring the safe and stable operation of 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 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 and a terminal assembly. The terminal assembly includes an upper terminal plate, an insulating seal, and an insulating and thermally conductive structure. The upper terminal plate includes a terminal mounting area and a thermally conductive area. The insulating seal is disposed between the terminal mounting area and the cover, and the insulating and thermally conductive structure is disposed between the thermally conductive area and the cover.

[0008] Optionally, the heat-conducting area includes a first heat-conducting area and a second heat-conducting area, the first heat-conducting area and the second heat-conducting area are respectively located at both ends of the pole mounting area, and the insulating heat-conducting structure includes a first insulating heat-conducting structure and a second insulating heat-conducting structure, the first insulating heat-conducting structure is located between the first heat-conducting area and the cover plate, and the second insulating heat-conducting structure is located between the second heat-conducting area and the cover plate.

[0009] Optionally, it also includes an explosion-proof valve hole, which is located on the end of the cover plate away from the second insulating and heat-conducting structure.

[0010] Optionally, it also includes a liquid injection hole, which is located at one end of the cover plate away from the second insulating and heat-conducting structure.

[0011] 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.

[0012] 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.

[0013] 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.

[0014] 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.

[0015] 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.

[0016] 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.

[0017] 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.

[0018] One of the electrode assembly has an injection hole on its upper electrode plate, which penetrates the upper electrode plate.

[0019] On the other hand, this application provides a lithium-ion battery, including the aforementioned battery cover assembly.

[0020] The beneficial effects of this utility model are as follows:

[0021] In the battery cover assembly provided in this application, an insulating thermally conductive structure is disposed between the thermally conductive area and the cover plate. Utilizing its own thermal conductivity, the insulating thermally conductive structure guides heat from the thermally conductive area to the cover plate, successfully establishing a heat conduction network from the electrode to the cover plate. This allows the heat generated by the electrode during battery operation to be quickly transferred to the cover plate via the thermally conductive area, thereby achieving efficient heat dissipation and overcoming the shortcomings of heat dissipation in existing cover assemblies, thus improving the overall heat dissipation efficiency of the lithium-ion battery. Furthermore, an insulating seal is disposed between the electrode mounting area and the cover plate, preventing electrolyte leakage, avoiding short-circuit risks, and ensuring the electrical safety of the lithium-ion battery. It also ensures the sealing of the battery's internal environment, providing a good internal environment for the stable and efficient transfer of heat from the electrode to the cover plate. In short, the battery cover assembly provided in this application, with its insulating thermally conductive structure and insulating seal working together, further improves the overall heat dissipation efficiency of the battery cover assembly, extends the lifespan of the lithium-ion battery, and ensures the safe and stable operation of the lithium-ion battery. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the battery cover assembly structure provided in one embodiment of the present invention;

[0023] Figure 2 yes Figure 1 Exploded view;

[0024] Figure 3 yes Figure 1 A schematic diagram of the cross-sectional structure;

[0025] Figure 4 This is a schematic diagram of the battery cover assembly structure provided in another embodiment of the present invention;

[0026] Figure 5 yes Figure 4 Exploded view;

[0027] Figure 6 This is a schematic diagram of the battery cover assembly structure provided in another embodiment of the present invention;

[0028] Figure 7 yes Figure 6 Exploded view;

[0029] Figure 8 yes Figure 6 A schematic diagram of the cross-sectional structure.

[0030] The reference numerals in the accompanying drawings are as follows:

[0031] 1. Cover plate; 2. Pole post assembly; 21. Upper pole post plate; 22. Insulating seal; 23. Insulating and heat-conducting structure; 231. First insulating and heat-conducting structure; 232. Second insulating and heat-conducting structure; 24. Pole post mounting area; 25. Heat-conducting area; 251. First heat-conducting area; 252. Second heat-conducting area; 3. Explosion-proof valve hole; 4. Injection hole; 5. Insulating plastic part; 6. Lower pole post plate; 7. First pole post mounting hole; 8. Second pole post mounting hole; 9. Third pole post mounting hole; 10. Fourth pole post mounting hole; 11. Pole post. Detailed Implementation

[0032] 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.

[0033] 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.

[0034] 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.

[0035] Reference Figure 1-3 An embodiment of the present invention provides a battery cover assembly, including a cover plate 1 and a terminal post assembly 2. The terminal post assembly 2 includes an upper terminal post plate 21, an insulating seal 22, and an insulating heat-conducting structure 23. The upper terminal post plate 21 includes a terminal post mounting area 24 and a heat-conducting area 25. The insulating seal 22 is disposed between the terminal post mounting area 24 and the cover plate 1, and the insulating heat-conducting structure 23 is disposed between the heat-conducting area 25 and the cover plate 1.

[0036] Specifically, in the battery cover assembly provided in this application, the insulating thermally conductive structure 23 is disposed between the thermally conductive area 25 and the cover plate 1. The insulating thermally conductive structure, relying on its own thermal conductivity, guides heat from the thermally conductive area 25 to the cover plate 1, successfully establishing a heat conduction network from the electrode post 11 to the cover plate 1. This allows the heat generated by the electrode post 11 during battery operation to be quickly transferred to the cover plate 1 via the thermally conductive area 25, thereby achieving efficient heat dissipation and overcoming the shortcomings of heat dissipation in existing cover assembly technologies, thus improving the overall heat dissipation efficiency of the lithium-ion battery. Furthermore, the insulating seal 22 is disposed between the electrode post mounting area 24 and the cover plate 1. This not only prevents electrolyte leakage and avoids short-circuit risks, ensuring the electrical safety of the lithium-ion battery, but also ensures the sealing of the battery's internal environment, providing a good internal environment for the stable and efficient transfer of heat from the electrode post 11 to the cover plate 1. In other words, in the battery cover assembly provided in this application, the insulating thermally conductive structure 23 and the insulating seal 22 work together to further improve the overall heat dissipation efficiency of the battery cover assembly, increase the service life of the lithium-ion battery, and ensure the safe and stable operation of the lithium-ion battery.

[0037] The insulating seal 22 described in this application can achieve a good sealing effect, seal the assembly gap to prevent leakage, and the insulating seal 22 with this sealing and insulation effect can be made of materials such as nitrile rubber, fluororubber, polyvinyl chloride, and polypropylene.

[0038] The insulating and heat-conducting structure 23 described in this application for preparing the battery cover assembly can quickly conduct away the heat generated during battery operation while maintaining good insulation performance.

[0039] In one embodiment, the heat-conducting area 25 includes a first heat-conducting area 251 and a second heat-conducting area 252, which are located at the two ends of the pole mounting area 24, respectively. The insulating heat-conducting structure 23 includes a first insulating heat-conducting structure 231 and a second insulating heat-conducting structure 232, where the first insulating heat-conducting structure 231 is located between the first heat-conducting area 251 and the cover plate 1, and the second insulating heat-conducting structure 232 is located between the second heat-conducting area 252 and the cover plate 1.

[0040] Specifically, the heat-conducting areas 25 are configured as a first heat-conducting area 251 and a second heat-conducting area 252 located at both ends of the terminal mounting area 24, and correspondingly configured with first and second insulating heat-conducting structures 232, which greatly widens the heat transfer path. When the battery operates and the terminal 11 generates heat, the heat can be transferred to the cover plate 1 simultaneously from two directions, namely the first heat-conducting area 251 and the second heat-conducting area 252, through their respective insulating heat-conducting structures 23. Compared with a single heat-conducting area 25, the heat transfer efficiency is significantly improved, and the heat of the terminal 11 can be dissipated more quickly, effectively reducing the temperature of the terminal 11 and reducing the impact of high temperature on battery life and safety. In addition, the symmetrical layout of the two heat-conducting areas 25 and the insulating heat-conducting structures 23 ensures that heat is evenly transferred at both ends of the terminal mounting area 24, avoiding local overheating caused by heat concentration at one end. This balanced heat distribution helps maintain the consistency of the battery's internal temperature, improves the overall heat dissipation stability of the battery, ensures the stable performance of each part of the battery, and reduces the risk of battery failure caused by excessive temperature differences.

[0041] Reference Figure 1 In one embodiment, it further includes an explosion-proof valve hole 3, which is disposed on the end of the cover plate 1 away from the second insulating heat-conducting structure 232.

[0042] Specifically, as in this application Figure 1 The battery cover assembly can be assembled as a cover assembly for the positive electrode of a lithium-ion battery.

[0043] In this embodiment, the explosion-proof valve hole 3 is located on the end of the cover plate 1 away from the second insulating heat-conducting structure 232, which avoids the impact and damage to the insulating heat-conducting structure 23 during the pressure relief process, ensuring that the insulating heat-conducting structure 23 can continuously and stably play a heat dissipation role, and further protects battery safety.

[0044] Because the explosion-proof valve port 3 is far from the second insulating heat-conducting structure 232, during heat dissipation, the insulating heat-conducting structure 23 can stably transfer heat to the cover plate 1, and the heat dissipation efficiency will not be affected by factors such as possible gas leakage or pressure fluctuations in the explosion-proof valve port 3. When the explosion-proof valve port 3 needs to be activated to release pressure, it will not affect the normal heat conduction function of the insulating heat-conducting structure 23, thus achieving effective separation and synergistic operation of heat dissipation and explosion-proof functions, improving the overall performance and reliability of the battery.

[0045] Reference Figure 4 In one embodiment, it further includes a liquid injection hole 4, which is disposed on the end of the cover plate 1 away from the second insulating heat-conducting structure 232.

[0046] Specifically, as in this application Figure 4 As shown, the injection hole 4 can be located at the end of the cover plate 1, and Figure 4The battery cover assembly shown can be assembled as a cover assembly for the negative electrode of a lithium-ion battery.

[0047] When Figure 4 When the cover plate assembly shown is assembled with the cover plate assembly of the negative electrode of the lithium-ion battery, the reasonable distribution of the liquid injection holes 4 and the second insulating and heat-conducting structure 232 can make more efficient use of the internal space of the battery. During the battery assembly process, the connection lines and fixing structures can be arranged more conveniently, thereby improving the overall integration and stability of the battery.

[0048] In one embodiment, the pole assembly 2 further includes a pole 11, which passes through the cover plate 1 and the insulating seal 22 in sequence and is connected to the upper pole plate 21.

[0049] Specifically, the terminal post 11 passes through the cover plate 1 and the insulating seal 22 in sequence and connects to the upper terminal plate 21, providing a more direct and efficient path for the heat generated by the terminal post 11 during battery operation. When a large current passes through the terminal post 11 and generates heat, the heat can be quickly transferred through the terminal post 11 to the heat-conducting area 25 of the upper terminal plate 21. Since the terminal post 11 is directly connected to the upper terminal plate 21, the thermal resistance during heat transfer is reduced, allowing the heat to be quickly and efficiently conducted to the heat-conducting area 25, and then transferred to the cover plate 1 through the insulating heat-conducting structure 23 and dissipated. This significantly improves the heat dissipation efficiency of the battery, effectively reduces the temperature of the terminal post 11, and ensures the stable operation of the battery.

[0050] The insulating seal 22 ensures electrical insulation between the terminal post 11 and the cover plate 1, preventing current leakage, avoiding short circuit faults in the battery, and ensuring the electrical safety of the battery. On the other hand, the insulating seal 22 effectively prevents external impurities (moisture, dust) from entering the battery, maintaining the stability of the internal environment of the battery, preventing impurities from corroding the internal components of the battery or affecting the heat dissipation effect, and providing a good internal environment for the normal operation of the battery.

[0051] In one embodiment, the electrode assembly 2 further includes an insulating plastic component 5 and a lower electrode plate 6. The lower electrode plate 6 is located on the side of the cover plate 1 opposite to the upper electrode plate 21. The insulating plastic component 5 is located between the lower electrode plate 6 and the cover plate 1. The electrode 11 passes through the insulating plastic component 5, the cover plate 1, and the insulating seal 22 in sequence and connects the upper electrode plate 21 and the lower electrode plate 6.

[0052] Specifically, the terminal post 11 passes through the insulating plastic part 5, the cover plate 1, and the insulating sealing part 22, connecting the upper and lower terminal post plates 6, thus constructing a more comprehensive heat conduction network. The lower terminal post plate 6 also generates heat during battery operation. Through the terminal post 11 as a conductive medium, the heat can be quickly transferred to the heat conduction area 25 of the upper terminal post plate 21, and then transferred to the cover plate 1 through the insulating heat conduction structure 23 to achieve heat dissipation. This not only strengthens the heat management of the lower terminal post plate 6, but also works in conjunction with the heat dissipation mechanism of the upper terminal post plate 21 to form an efficient heat dissipation channel from the lower terminal post plate - terminal post - upper terminal post plate - insulating heat conduction structure - cover plate, greatly improving the overall heat dissipation efficiency of the battery.

[0053] The insulating plastic part 5 separates the lower electrode plate 6 from the cover plate 1, preventing abnormal current conduction between the two; the insulating seal 22 further ensures the insulation between the electrode 11 and the cover plate 1, preventing the risk of leakage; the dual setting of the insulating plastic part 5 and the insulating seal 22 effectively avoids internal short circuits in the battery, greatly improves the safety during battery use, and reduces the risk of safety accidents caused by electrical faults.

[0054] In one embodiment, a first pole mounting hole 7 is provided on the pole mounting area 24, and the end of the pole 11 is inserted into and welded to the first pole mounting hole 7.

[0055] Specifically, the end of the electrode post 11 is inserted into and welded to the first electrode post mounting hole 7. Due to the welding, the contact area between the electrode post 11 and the electrode post mounting hole is large and the contact is tight, and the thermal resistance is significantly reduced. When the electrode post 11 generates heat, the heat can be transferred more efficiently through the welding part to the heat-conducting area 25 of the upper electrode plate 21, and then transferred to the cover plate 1 through the insulating heat-conducting structure 23 to achieve heat dissipation, thereby reducing the impact of high temperature on battery performance and life.

[0056] In one embodiment, the cover plate 1 is provided with a second pole mounting hole 8 corresponding to the position of the first pole mounting hole 7, the insulating seal 22 is provided with a third pole mounting hole 9 corresponding to the position of the first pole mounting hole 7, and the insulating plastic part 5 is provided with a fourth pole mounting hole 10 corresponding to the position of the first pole mounting hole 7.

[0057] The pole post 11 passes through the first pole post mounting hole 7, the second pole post mounting hole 8, the third pole post mounting hole 9, and the fourth pole post mounting hole 10.

[0058] Specifically, the terminal post 11 smoothly passes through each mounting hole and is tightly connected to the upper terminal plate 21, creating a smooth path for heat transfer. When the terminal post 11 generates heat, the heat can be efficiently conducted from the terminal post 11 to the heat-conducting area 25 of the upper terminal plate 21, and then transferred to the cover plate 1 through the insulating heat-conducting structure 23 and dissipated. The precise alignment of the mounting holes of each component ensures good contact between the terminal post 11 and other components, reduces thermal resistance, optimizes the heat dissipation path, helps to quickly reduce the temperature of the terminal post 11, maintains the battery within a suitable operating temperature range, and improves the overall performance of the battery.

[0059] The insulating seal 22 and the third and fourth terminal mounting holes 10 on the insulating plastic part 5, combined with their own insulating properties, provide double insulation protection for the terminal 11. The insulating seal 22 prevents electrical conduction between the terminal 11 and the cover plate 1, avoiding the risk of leakage; the insulating plastic part 5 further isolates the current between the lower terminal plate 6 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 the safety during battery use, and reduces the possibility of electrical faults causing safety accidents.

[0060] 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.

[0061] An explosion-proof valve hole 3 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 3 on the side away from the end of the cover plate 1.

[0062] One of the electrode assembly 2 has an injection hole 4 on its upper electrode plate 21, which penetrates the upper electrode plate 21.

[0063] Specifically, the upper electrode plates 21 of the two electrode assembly 2 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 11 can be transferred to the cover plate 1 through the heat-conducting area 25 of each upper electrode plate 21 and the insulating heat-conducting structure 23. Multiple heat dissipation areas work together to accelerate heat dissipation. The upper electrode plates 21 are located near the explosion-proof valve hole 3, where heat dissipation is rapid, forming good heat dissipation convection, further improving overall heat dissipation efficiency and ensuring stable battery operation.

[0064] An explosion-proof valve hole 3 is provided in the center of the cover plate 1. When the internal pressure of the battery rises abnormally, it can release pressure in time to prevent serious accidents such as explosion. The electrode plate 21 on the electrode assembly 2 is close to the explosion-proof valve hole 3. 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 3 can respond quickly, release pressure, reduce safety risks, and enhance battery safety performance.

[0065] Another embodiment of this application provides a lithium-ion battery, including the aforementioned battery cover assembly.

[0066] Specifically, the lithium-ion battery uses the battery cover assembly provided in this application. In the battery cover assembly provided in this application, the insulating thermally conductive structure 23 is disposed between the thermally conductive area 25 and the cover plate 1. The insulating thermally conductive structure, by virtue of its own thermal conductivity, guides heat from the thermally conductive area 25 to the cover plate 1, successfully establishing a heat conduction network from the electrode post 11 to the cover plate 1. This allows the heat generated by the electrode post 11 during battery operation to be quickly transferred to the cover plate 1 via the thermally conductive area 25, thereby achieving efficient heat dissipation. This overcomes the shortcomings of heat dissipation in existing cover assemblies and improves the overall heat dissipation of the lithium-ion battery. Efficiency; In addition, the insulating seal 22 is disposed between the terminal mounting area 24 and the cover plate 1, which can prevent electrolyte leakage, avoid short circuit risk, and ensure the electrical safety of lithium-ion battery, and also ensure the sealing of the internal environment of the battery, providing a good internal environment for the stable and efficient transfer of heat from the terminal 11 to the cover plate 1; that is, the battery cover assembly provided in this application, in which the insulating heat-conducting structure 23 and the insulating seal 22 cooperate with each other, is conducive to further improving the overall heat dissipation efficiency of the battery cover assembly, improving the service life of lithium-ion battery, and ensuring the safe and stable operation of lithium-ion battery.

[0067] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A battery cover assembly, characterized in that, The device includes a cover plate (1) and an electrode assembly (2). The electrode assembly (2) includes an upper electrode plate (21), an insulating seal (22), and an insulating heat-conducting structure (23). The upper electrode plate (21) includes an electrode mounting area (24) and a heat-conducting area (25). The insulating seal (22) is disposed between the electrode mounting area (24) and the cover plate (1). The insulating heat-conducting structure (23) is disposed between the heat-conducting area (25) and the cover plate (1).

2. The battery cover assembly according to claim 1, characterized in that, The heat-conducting area (25) includes a first heat-conducting area (251) and a second heat-conducting area (252). The first heat-conducting area (251) and the second heat-conducting area (252) are located at both ends of the pole mounting area (24). The insulating heat-conducting structure (23) includes a first insulating heat-conducting structure (231) and a second insulating heat-conducting structure (232). The first insulating heat-conducting structure (231) is located between the first heat-conducting area (251) and the cover plate (1). The second insulating heat-conducting structure (232) is located between the second heat-conducting area (252) and the cover plate (1).

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

4. The battery cover assembly according to claim 2, characterized in that, It also includes a liquid injection hole (4), which is located on the cover plate (1) at one end away from the second insulating and heat-conducting structure (232).

5. The battery cover assembly according to claim 1, characterized in that, The pole assembly (2) further includes a pole (11), 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 (5) and a lower pole plate (6). The lower pole plate (6) is located on the side of the cover plate (1) away from the upper pole plate (21). The insulating plastic part (5) is located between the lower pole plate (6) and the cover plate (1). The pole (11) passes through the insulating plastic part (5), the cover plate (1) and the insulating seal (22) in sequence and connects the upper pole plate (21) and the lower pole plate (6).

7. The battery cover assembly according to claim 6, characterized in that, The pole mounting area (24) is provided with a first pole mounting hole (7), and the end of the pole (11) is inserted into and welded to the first pole mounting hole (7).

8. The battery cover assembly according to claim 7, characterized in that, The cover plate (1) is provided with a second pole mounting hole (8) corresponding to the first pole mounting hole (7), the insulating seal (22) is provided with a third pole mounting hole (9) corresponding to the first pole mounting hole (7), and the insulating plastic part (5) is provided with a fourth pole mounting hole (10) corresponding to the first pole mounting hole (7). The pole (11) passes through the first pole mounting hole (7), the second pole mounting hole (8), the third pole mounting hole (9), and the fourth pole mounting hole (10).

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 (3) 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 (3) on the side away from the end of the cover plate (1). One of the electrode assembly (2) has an injection hole (4) on its upper electrode plate (21), which 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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