Cover plate assembly and battery

Abstract

The present application provides a cover plate assembly and a battery. The cover plate assembly comprises a cover, an insulating support part and support members; the cover is provided with a safety vent; the insulating support part is arranged opposite to the cover and is attached to the cover; the insulating support part is provided with a gas discharge port corresponding to the safety vent; the support members are mounted on the insulating support part, and are located between the cover and a cell; and the melting temperature of the support members is higher than that of the insulating support part.

Description

Cover assembly and battery

[0001] This application claims priority to Chinese Patent Application No. 202422522605.9, filed on October 17, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of energy storage technology, specifically to a cover plate assembly and a battery. Background Technology

[0003] With the increasing maturity of lithium-ion battery technology, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage, leading to increasingly stringent requirements for their performance and safety. In traditional square lithium batteries, the insulating support portion of the cover assembly is used to hold the cell pack in place. Invention Overview

[0004] However, when the battery runs out of control and the temperature is too high, the insulation support will melt completely at high temperature, resulting in a lack of support between the core pack and the cover assembly. The core pack will then fit tightly against the cover, blocking the explosion-proof valve. This causes the explosion-proof valve to lose its pressure relief function, preventing a large amount of gas generated during the cell failure process from being released from the explosion-proof valve. This causes the cell to swell and explode, leading to a safety accident.

[0005] In a first aspect, this application provides a cover plate assembly. The cover plate assembly includes:

[0006] The cover is equipped with an explosion-proof valve;

[0007] An insulating support is provided opposite to and in contact with the cover. The insulating support is provided with an exhaust port corresponding to the explosion-proof valve.

[0008] The support component is installed on the insulating support part. The support component is located between the cover and the core package. The melting temperature of the support component is greater than that of the insulating support part.

[0009] Secondly, this application also provides a battery, which includes a cover assembly. Beneficial effects

[0010] The cover assembly provided in this application has an insulating support portion that is positioned opposite and attached to the cover body. It has an exhaust port corresponding to the explosion-proof valve. This means that under normal circumstances, it provides necessary support while ensuring the explosion-proof valve can open smoothly to release gas when needed. For example, when the core package experiences thermal runaway and gas is generated inside, the gas can be discharged through the exhaust port via the explosion-proof valve. Furthermore, during thermal runaway, the high temperature of the gas discharged from the core package will cause the insulating support portion to completely melt. However, because the melting temperature of the support member installed on the insulating support portion is higher than that of the insulating support portion, even after the insulating support portion completely melts, the support member can maintain its structural integrity, thereby separating the cover body and the core package. This prevents the core package from directly and tightly adhering to the cover body, avoiding the risk of the explosion-proof valve being blocked. This ensures that the explosion-proof valve can open normally to discharge high-temperature, high-pressure gas, greatly reducing the risk of cell explosion. In addition, since the insulating support portion and the support member can simultaneously support the cover body, this design can disperse the force exerted by the core package on the cover body, reducing stress concentration in the cover body. By incorporating support components, some of the heat generated by the core pack is transferred to the cover, while the rest is transferred to the support components. This helps to dissipate the heat generated by the core pack quickly and reduces the risk of localized overheating of the core pack. Attached Figure Description

[0011] Figure 1 is an exploded view of a cover plate assembly provided in some embodiments of this application;

[0012] Figure 2 is a magnified view of part D shown in Figure 1;

[0013] Figure 3 is a cross-sectional schematic diagram of a cover plate assembly provided in some embodiments of this application;

[0014] Figure 4 is a magnified view of part A shown in Figure 3;

[0015] Figure 5 is the front view of Figure 3;

[0016] Figure 6 is a magnified view of part B shown in Figure 5;

[0017] Figure 7 is a magnified view of part C shown in Figure 5.

[0018] Explanation of reference numerals in the attached figures:

[0019] 10. Cover plate assembly; 1. Cover body; 11. Mounting hole; 12. Reservoir groove; 13. Explosion-proof valve;

[0020] 2. Insulation support part; 21. Exhaust port; 22. Support body; 23. Support platform; 231. Mounting groove; 232. Placement hole; 24. Through hole; 3. Support component; 4. Support unit; 41. First support unit; 42. Second support unit; 5. Pole post; 51. Sealing body; 52. Column; 6. Sealing ring; 7. Upper plastic ring; 71. Annular body; 72. Annular abutment arm; 73. Annular boss; 8. Receiving groove; 9. Pressure ring. Embodiments of the present invention

[0021] Referring to Figures 1 to 4, the cover plate assembly 10 includes a cover body 1, an insulating support part 2, and a support member 3. The cover body 1 is provided with an explosion-proof valve 13. The insulating support part 2 is disposed opposite to the cover body 1 and is attached to the cover body 1. The insulating support part 2 is provided with an exhaust port 21 corresponding to the explosion-proof valve 13. The support member 3 is installed on the insulating support part 2 and is located between the cover body 1 and the core package. The melting temperature of the support member 3 is greater than the melting temperature of the insulating support part 2.

[0022] In one possible implementation of this application, the insulating support 2 is disposed opposite to and attached to the cover 1, and has an exhaust port 21 corresponding to the explosion-proof valve 13. This means that under normal circumstances, it can provide necessary support and ensure that the explosion-proof valve 13 can be opened smoothly to exhaust gas when needed. For example, when the core package experiences thermal runaway and gas is generated inside, the gas can be discharged through the exhaust port 21 via the explosion-proof valve 13. In addition, during thermal runaway, the temperature of the gas discharged from the core package is too high, which will cause the insulating support 2 to completely melt. However, since the melting temperature of the support member 3 installed on the insulating support 2 is higher than that of the insulating support 2, even if the insulating support is completely melted, the support member 3 can maintain its structural integrity, thereby separating the cover 1 and the core package, preventing the core package from being directly and tightly attached to the cover 1, avoiding the risk of the explosion-proof valve 13 being blocked, ensuring that the explosion-proof valve 13 can open normally to discharge high-temperature and high-pressure gas, and greatly reducing the risk of cell explosion. Furthermore, since the insulating support 2 and the support member 3 can simultaneously support the cover, this design can disperse the force exerted by the core package on the cover 1, reducing stress concentration in the cover 1. By providing the support member 3, part of the heat generated by the core package is transferred to the cover 1, and the other part is transferred to the support member 3. This helps to dissipate the heat generated by the core package quickly and reduces the risk of localized overheating of the core package.

[0023] It should be noted that the cover is made of conductive metal, such as aluminum, iron or copper. In this application, the cover mainly serves to conduct electricity and provide connection.

[0024] In some possible implementations, the melting temperature of the support member 3 is T, where T ≥ 500℃. Thus, when the melting temperature of the support member 3 is set at 500℃ or above, it can maintain structural stability at higher operating temperatures and is less prone to softening or melting. When the melting temperature of the support member 3 is set at 500℃ or above, even if the insulating support part 2 melts, the support member 3 can continue to support the core package and the cover 1, creating a gap between the cover and the core package to form an exhaust channel, thereby preventing the core package from blocking the explosion-proof valve 13. When the melting temperature of the support member 3 is less than 500℃, the support member 3 is prone to melting, increasing the likelihood of the core package blocking the explosion-proof valve 13.

[0025] It should be noted that the melting temperature of the support 3 can be 500℃, 550℃, 600℃, 650℃, 780℃, 800℃, 980℃ or 1000℃, etc. The melting temperature of the support 3 can be selected as needed, and this application does not limit it.

[0026] In some possible implementations, the material of the support member 3 includes ceramic or metal, so that when thermal runaway occurs in the core package, the support member 3 can continue to support between the cover 1 and the core package after the insulating support part 2 melts, preventing the core package from being directly and tightly attached to the cover 1, avoiding the risk of the explosion-proof valve 13 being blocked, and ensuring that the explosion-proof valve 13 can open normally when too much gas is generated inside the cell, greatly reducing the risk of cell explosion.

[0027] It should be noted that the metal can include nickel-based alloys, tungsten, molybdenum, tantalum, niobium, etc. In some possible implementations, the material for the support member 3 can be selected as needed, and this application does not limit it in this regard.

[0028] Furthermore, the material of the insulating support 2 includes PP plastic, which has a temperature resistance between 120 and 150°C. When the battery cell fails, its temperature will reach over 300°C. If the temperature exceeds the temperature resistance of the insulating support 2, the insulating support 2 will melt. Of course, in other possible implementations, the material of the insulating support 2 may also include silicone, epoxy resin, or unsaturated polyester resin glass fiber reinforced molding compound, etc. This application does not limit the specific materials used in these implementations.

[0029] Referring to Figures 1 and 3, in some possible implementations, the insulating support 2 includes a support body 22 and a support platform 23. The support body 22 is disposed opposite to and in contact with the cover 1, thereby increasing the contact area between the insulating support 2 and the cover 1 and improving the supporting strength of the insulating support 2. The support platform 23 is connected to the support body 22 and protrudes from the support body 22 toward the core package. This allows the support platform 23 to abut against the core package or to space the core package from the support body 22, forming an exhaust channel between the support body 22 and the core package. The existence of the exhaust channel allows gas to be discharged to the explosion-proof valve 13 when the core package needs to be depressurized or thermal runaway occurs. In addition, the formation of the exhaust channel helps to improve the heat dissipation of the core package.

[0030] It should be noted that the support platform 23 can have various shapes. For example, in some possible implementations, the support platform 23 can be a cylinder, while in others it can be an annular shape surrounding the exhaust port. In other possible implementations, the support platform 23 can also be a cuboid or a cube. In some possible implementations, the shape of the support platform 23 can be selected as needed, and this application does not limit it in this regard.

[0031] Referring to Figures 3, 5, and 7, in some possible implementations, the support member 3 is mounted on the support platform 23. This makes the structure of the cover plate assembly 10 compact. In addition, the support member 3 is directly mounted on the support platform 23, eliminating complex installation steps and additional connectors. This design reduces installation difficulty and cost, and improves installation efficiency.

[0032] It should be noted that, in other possible implementations, the support member 3 can also be installed on the support body 22. In some possible implementations, the specific installation position of the support member 3 can be selected as needed, and this application does not limit it.

[0033] There are several ways to install the support member 3 onto the support platform 23. For example, referring to Figures 3, 5, and 7, in some possible implementations, the support platform 23 is provided with a mounting groove 231, and the support member 3 is installed within the mounting groove 231. This design of the mounting groove 231 ensures that the support member 3 is securely installed on the support platform 23, preventing instability due to loosening or displacement. The support member 3 is directly installed within the mounting groove 231 of the support platform 23, eliminating the need for complex installation steps and additional fasteners, thus significantly reducing installation difficulty and cost, and improving installation efficiency. When the support member 3 needs to be replaced or repaired, it can be directly removed from the mounting groove 231 for replacement or repair, making maintenance work simpler and faster, reducing maintenance costs and time. The design of the mounting groove 231 creates a tight connection between the support member 3 and the support platform 23, enhancing the overall integrity of the insulating support part 2 and the support member 3. This integrity improves the appearance and reliability of the cover assembly 10.

[0034] In some possible implementations, the support block is snap-fitted into the mounting slot 231. This snap-fit ​​method ensures the support block is securely installed within the mounting slot 231, preventing loosening or displacement. The snap-fit ​​method typically involves simple installation steps, requiring no complex tools or additional fasteners, thus significantly reducing installation difficulty and cost, and improving installation efficiency. Furthermore, for situations requiring replacement or adjustment of the support component 3, the snap-fit ​​method also simplifies and expedites the disassembly process.

[0035] In some possible implementations, the support member 3 is glued and fixed within the mounting groove 231. This glued fixing provides strong adhesion, ensuring the support member 3 is stably and securely fixed within the mounting groove 231, preventing it from detaching. The glued fixing method does not require complex equipment and tools, thus reducing the installation difficulty and cost of the support member 3. Because the glued fixing method is simple and easy to implement, it can significantly shorten the installation time of the support member 3 and improve its installation efficiency.

[0036] It should be noted that the features of the support member 3 being snap-fitted into the mounting groove 231 and the features of the support member 3 being glued to the mounting groove 231 can be selectively provided, or both can be provided simultaneously. When both features are provided simultaneously, the support member 3 is stably and firmly installed in the mounting groove 231. In addition, in other possible implementations, the support block can also be fixed in the mounting groove 231 by screws or magnetic structures, etc. This application does not limit the implementation in some possible ways.

[0037] Referring to Figure 1, in some possible implementations, the opening of the mounting slot 231 faces the cover 1. This design makes the installation of the support member 3 more intuitive and simple. Operators can easily align the support member 3 with the opening and push it into the mounting slot 231 without complex positioning and adjustment steps, thus saving installation time and labor costs. The opening of the mounting slot 231 facing the cover 1 ensures that the opening can be covered by the cover 1 after the support member 3 is installed in the mounting slot 231, preventing the support member 3 from falling out of the slot. Additionally, it helps maintain the neat and aesthetically pleasing appearance of the cover assembly 10. When maintenance or replacement of the support member 3 is required, operators can easily remove or reinstall the support member 3 through the slot, thus avoiding complex disassembly steps and additional tool requirements, simplifying the maintenance process and reducing maintenance costs.

[0038] It should be noted that, in other possible implementations, the slot of the mounting groove 231 can also be set away from the cover 1, or the slot of the mounting groove 231 can also be set on the side wall where the support platform 23 is connected to the support body 22. In some possible implementations, the specific orientation of the slot of the mounting groove 231 can be set as needed, and this application does not limit it.

[0039] In some possible implementations, the thickness of the support member 3 is less than or equal to the depth of the mounting groove 231. This ensures that the thickness of the support member 3 does not exceed the depth of the mounting groove 231, effectively preventing the support member 3 from protruding from the surface of the mounting groove 231 after installation. This reduces the space occupied by the support member 3 in the cell height direction and ensures the compactness of the cover plate assembly 10 in the cell height direction.

[0040] There are several ways to install the support member 3 onto the support platform 23. For example, referring to Figures 1 and 3, in some possible implementations, the support platform 23 is provided with multiple mounting holes 232, which are spaced apart. The support member 3 includes multiple support columns, which are installed within the multiple mounting holes 232. Thus, the multiple support columns, installed on the support platform 23 through the spaced mounting holes 232, can achieve uniform support for the support platform 23. This uniform support design can prevent deformation or damage to the support platform 23 due to excessive force at a single point. Furthermore, the pre-set mounting holes 232 and the cooperation of the support columns make the installation and disassembly of the support columns simple and quick, reducing maintenance costs and time. If a support column is damaged or needs replacement, the other support columns can still provide support.

[0041] In some possible implementations, the diameter of the mounting hole 232 is D, where 1mm≤D≤20mm. This avoids the support platform 23 from being too large (greater than 20mm) and thus reducing its strength, while also avoiding the support platform 23 from being too small (less than 1mm) and thus making it difficult to process. The diameter of the mounting hole 232 is between 1mm and 20mm, which ensures the strength of the support platform 23 while making it easy to process and preventing deformation of the support platform 23.

[0042] It should be noted that the diameter of the mounting hole 232 can be 1mm, 2mm, 4mm, 5mm, 7mm, 10mm, 13mm, 16mm, 19mm or 20mm, etc. The diameter of the mounting hole 232 can be set as needed, and this application does not limit it.

[0043] Referring to Figures 3 and 5, in some possible implementations, the support platform 23 and the support member 3 together constitute a support unit 4. At least two support units 4 are provided, spaced apart. This achieves multi-point support between the cover 1 and the core package, improving the stability of the support. The spaced arrangement of at least two support units 4 allows the load to be distributed more evenly on the cover 1. Furthermore, it reduces the concentrated stress borne by a single support unit 4, thereby extending the service life of both the support unit 4 and the cover 1.

[0044] It should be noted that the support member 3 can have various shapes. For example, the support member 3 can be arranged in a ring shape, a sphere shape, or a cube shape. In some possible implementations, the shape of the support member 3 can be set as needed, and this application does not limit it in this regard.

[0045] It should be noted that the support unit 4 can be two, three, four, or even more. In some possible implementations, this application does not limit the specific number of support units 4. Furthermore, when two support units 4 are provided, they can be positioned on either side of the exhaust port 21 along the length of the cover 1, or they can be positioned on either side of the exhaust port 21 along the width of the cover 1. When three or more support units 4 are provided, multiple support units 4 are positioned around the periphery of the exhaust port 21. In some possible implementations, the number and arrangement of the support units 4 can be adjusted according to the actual scenario and requirements; this application does not limit this.

[0046] Tabs are typically installed in energy storage devices such as batteries, serving as input and output ports for electrical energy. Their installation space needs to be clear and unobstructed to ensure the reliability and safety of the electrical connection. In some possible implementations, the length of the cover 1 is L, and the width of the support unit 4 along the length of the cover 1 is K, where K = aL, a is a coefficient, and 0.05 ≤ a ≤ 0.3. By reasonably controlling the width K of the support unit 4, it is ensured that the support unit 4 has sufficient strength to support the connection between the cover and the core package, while avoiding encroachment on the tab's installation space, thus simplifying the tab installation. When the value of a is less than 0.05, although the width of the support unit 4 is relatively narrow, providing more space for tab installation, the strength of the support unit 4 is insufficient, making it prone to deformation and affecting the support effect. When the value of a is greater than 0.3, the width of the support unit 4 will be too large, occupying the tab's installation space and making tab installation difficult.

[0047] Referring to Figures 3 and 5, in some possible implementations, multiple support units 4 include a first support unit 41 and a second support unit 42. The first support unit 41 and the second support unit 42 are respectively connected to both ends of the support body 22, thus forming a stable support structure. This allows an exhaust channel to be formed between the cover 1 and the core package, facilitating the discharge of high-pressure gas from the explosion-proof valve 13 through the exhaust channel in the event of thermal failure of the core package. At the same time, the first support unit 41 and the second support unit 42 can also avoid occupying the installation space of the electrode tab, making the installation operation of the electrode tab simple.

[0048] Referring to Figures 1, 4, and 6, in some possible implementations, the cover 1 has two mounting holes 11 along its thickness direction, and the insulating support 2 has two through holes 24 corresponding to the two mounting holes 11. The diameter of each through hole 24 is larger than the diameter of the corresponding mounting hole 11. The cover plate assembly 10 also includes two pole posts 5, each pole post 5 including a base 51 and a column 52 protruding from the base 51. The peripheries of the two bases 51 abut against the inner walls of the two through holes 24, so that the through holes 24 can radially limit the bases 51 and prevent the pole post 5 from moving radially along the through holes 24. The two columns 52 are adapted to pass through the two through holes 24 and extend into the corresponding two mounting holes 11, facilitating the subsequent electrical connection operation of the pole post 5 with other components.

[0049] Referring to Figures 4 and 6, the inner wall of the through hole 24 is stepped, forming a stepped surface facing away from the cover 1. This stepped surface abuts against the end face of the seat 51 facing the cover 1. This stepped surface design increases the contact area between the inner wall of the through hole 24 and the seat 51, thereby enhancing the connection strength and improving the overall stability of the pole post 5. Furthermore, the stepped surface provides a clear positioning reference for the seat 51 in the axial direction, ensuring precise alignment during installation by ensuring the stepped surface abuts against the end face of the seat 51 facing the cover 1. This ensures the pole post 5 can be accurately and stably installed on the cover 1. When the stepped surface abuts against the end face of the seat 51 facing the cover 1, the stepped surface can limit the seat in the axial direction, preventing axial displacement or shaking of the seat 51 and ensuring the accuracy and reliability of the pole post 5 installation.

[0050] Referring to Figures 1, 3, and 6, in some possible implementations, the cover assembly 10 further includes two sealing rings 6, each fitted onto one of the two posts 52. Each sealing ring 6 seals the gap between the cover 1 and the seat 51. Thus, the main function of the sealing rings 6 is sealing; they fit tightly against the posts 52, effectively preventing gas, liquid, or solid particles from leaking out or entering through the gap between the cover 1 and the seat 51. The sealing rings 6 reduce direct contact between the posts 52 and the cover 1, thereby reducing wear caused by friction and extending the service life of the pole post 5. In harsh working environments, such as high temperature, high pressure, and high humidity, the sealing rings 6 maintain stable sealing performance, ensuring reliable operation of the core package. The installation of the sealing rings 6 is relatively simple; they only need to be fitted onto the posts 52 without complicated operations.

[0051] Referring to Figures 1 and 3, in some possible implementations, the cover assembly 10 further includes two upper plastic rings 7, each fitted onto one of the two posts 52. At least a portion of the side of each upper plastic ring 7 facing away from the post 52 is used to abut against the inner wall of the corresponding mounting hole 11. This tight contact between the upper plastic ring 7 and the inner wall of the mounting hole 11 provides an additional sealing layer for the connection between the post 52 and the cover 1. This dual-sealing design (i.e., the dual function of the sealing ring 6 and the upper plastic ring 7) effectively prevents the penetration of gas, liquid, or solid particles, improving the overall sealing performance of the cover assembly 10. The upper plastic ring 7, acting as a buffer layer, reduces the impact and wear of the post 52 on the inner wall of the mounting hole 11 during installation or use, thereby extending the service life of the terminal post 5. The presence of the upper plastic ring 7 further isolates the electrical contact between the post 52 and the cover 1, improving the safety of the battery with this cover assembly 10. The tight fit between the upper plastic ring 7 and the inner wall of the mounting hole 11 helps to fix the position of the column 52 and prevent it from loosening or shifting during operation, thereby improving the installation stability of the cover plate assembly 10.

[0052] Referring to Figures 1, 4, and 6, in some possible implementations, each upper plastic ring 7 includes an annular body 71 and an annular abutment arm 72 extending from the annular body 71 toward the seat 51. The two annular bodies 71 are respectively installed on the side of the cover 1 facing away from the insulating support 2. The two annular abutment arms 72 are respectively fitted onto the two pillars 52 and abut against the inner wall of the corresponding mounting hole 11. Thus, the annular abutment arms 72 extend circumferentially along the pillar 52, making full contact with the inner wall of the mounting hole 11, providing all-around sealing protection and avoiding the risk of local leakage. In addition, the annular abutment arms 72 can also limit the movement of the pillar 52, preventing the pillar 52 from moving radially along the mounting hole 11, thus improving the stability of the pole post 5 installation. Since the annular abutment arms 72 are connected to the annular bodies 71 and are respectively installed on the side of the cover 1 facing away from the insulating support 2, the movement of the annular abutment arms 72 toward the support 3 can be prevented, ensuring that the annular abutment arms 72 always have a good sealing and limiting effect.

[0053] Referring to Figure 1, in some possible implementations, the cover 1 has two mounting grooves 12 on the side opposite to the insulating support 2. Each mounting groove 12 has a through-hole 11 in its bottom wall. Two annular bodies 71 are respectively installed in the two mounting grooves 12. Thus, the design of the mounting grooves 12 provides a precise installation position for the annular bodies 71, ensuring that the annular bodies 71 can be accurately installed in the predetermined position, avoiding positional deviation or insecure installation. Due to the presence of the mounting grooves 12, the annular bodies 71 can be easily embedded into each mounting groove 12, facilitating the abutment arm 72 to abut against the inner wall of the mounting hole 11. This installation method simplifies the installation steps of the annular bodies 71, reduces installation difficulty, and improves installation efficiency.

[0054] Referring to Figure 1, in some possible implementations, each annular body 71 has an annular boss 73 protruding from the side opposite to the cover body 1. The annular boss 73 and the column 52 are arranged opposite to each other and spaced apart, so that a receiving groove 8 is formed between the annular boss 73 and the column 52. The cover plate assembly 10 also includes two pressure rings 9, which are respectively installed in the two receiving grooves 8 and fitted onto the two columns 52. Each pressure ring 9 abuts against the bottom wall of the receiving groove 8 and is connected to the column 52. Thus, the tight abutment between the pressure ring 9 and the bottom wall of the receiving groove 8 and the connection between the pressure ring 9 and the column 52 effectively restricts the axial movement of the pole post 5 along the mounting hole 11. When the pressure ring 9 is installed in the receiving groove 8, it can be in close contact with the annular boss 73 and the column 52, thereby enhancing the sealing performance of the cover plate assembly 10. Due to the tight abutment between the pressure ring 9 and the bottom wall of the receiving groove 8 and the connection between the pressure ring 9 and the column 52, the risk of leakage caused by improper installation or loosening is reduced. This design improves the sealing reliability of the cover assembly 10 and extends its service life.

[0055] Another possible implementation of this application proposes a battery, which includes a cover assembly 10, the specific structure of which is described above. Since this battery adopts all the technical solutions of all the possible implementations described above, it has at least all the beneficial effects brought about by the technical solutions of the possible implementations described above, which will not be elaborated here.

Claims

1. A cover plate assembly, comprising: The cover is equipped with an explosion-proof valve; An insulating support portion is disposed opposite to and in contact with the cover body, and the insulating support portion is provided with an exhaust port corresponding to the explosion-proof valve; A support member is installed on the insulating support portion, the support member is located between the cover and the core package, and the melting temperature of the support member is greater than the melting temperature of the insulating support portion.

2. The cover plate assembly of claim 1, wherein, The melting temperature of the support component is T, where T ≥ 500℃.

3. The cover plate assembly of claim 2, wherein, The support component is made of ceramic or metal.

4. The cover plate assembly of any one of claims 1 to 3, wherein, The insulating support portion includes: A supporting body is disposed opposite to and attached to the cover, and the exhaust port is located on the supporting body; A support platform is connected to the support body and protrudes from the support body toward the core package to form an exhaust channel between the support body and the core package.

5. The cover plate assembly of claim 4, wherein, The support member is mounted on the support platform.

6. The cover plate assembly of claim 5, wherein, The support platform is provided with a mounting groove, and the support member is installed in the mounting groove.

7. The cover plate assembly of claim 6, wherein, The support member is snapped into the mounting groove, and / or the support member is glued into the mounting groove.

8. The cover plate assembly of claim 6 or 7, wherein, The opening of the mounting groove is oriented toward the cover, and / or the thickness of the support member is less than or equal to the depth of the mounting groove.

9. The cover plate assembly of any one of claims 5 to 8, wherein, The support platform is provided with multiple mounting holes, which are spaced apart. The support member includes multiple support columns, which are installed in the multiple mounting holes.

10. The cover plate assembly of claim 9, wherein, The diameter of the mounting hole is D, where 1mm ≤ D ≤ 20mm.

11. The cover plate assembly of any one of claims 4 to 10, wherein, The support platform and the support member together constitute a support unit, and at least two support units are provided, with the at least two support units arranged at intervals.

12. The cover plate assembly of claim 11, wherein, The length of the cover is L; The width of the support unit along the length of the cover is K, where K = aL, a is a coefficient, and 0.05 ≤ a ≤ 0.

3.

13. The cover plate assembly of claim 11 or 12, wherein, The plurality of support units include a first support unit and a second support unit, wherein the first support unit and the second support unit are respectively connected to both ends of the support body.

14. The cover plate assembly of any one of claims 1 to 10, wherein, The cover has two mounting holes along its thickness direction. The insulating support part is provided with two through holes corresponding to the two mounting holes, and the diameter of each through hole is larger than the diameter of the corresponding mounting hole. The cover plate assembly further includes two pole posts, each pole post including a base and a column protruding from the base. The periphery of the two bases abuts against the inner sidewalls of the two through holes, and the two columns are adapted to pass through the two through holes and extend into the corresponding two mounting holes.

15. The cover plate assembly according to claim 14, the cover plate assembly further comprising two sealing rings, the two sealing rings being respectively fitted onto the two pillars, each sealing ring being used to seal the gap between the cover and the seat.

16. The cover plate assembly according to claim 14 or 15 further includes two upper plastic rings, each upper plastic ring being respectively fitted onto one of the two pillars, and each upper plastic ring having at least a portion of its side facing away from the pillar abutting against the inner wall of the corresponding mounting hole.

17. The cover plate assembly of claim 16, wherein, Each of the upper plastic rings includes an annular body and an annular abutment arm extending from the annular body toward the seat. The two annular bodies are respectively installed on the side of the cover away from the insulating support. The two annular abutment arms are respectively fitted onto the two columns and abut against the inner sidewall of the corresponding mounting hole.

18. The cover plate assembly of claim 17, wherein, The cover body is provided with two mounting grooves on the side away from the insulating support part, and the bottom wall of each mounting groove is provided with the mounting hole through it; The two annular bodies are respectively installed in the two mounting slots.

19. The cover plate assembly of claim 17 or 18, wherein, Each of the annular bodies has an annular protrusion on the side away from the cover. The annular protrusions are arranged opposite to and spaced apart from the column, so that a receiving groove is formed between the annular protrusions and the column. The cover plate assembly also includes two pressure rings, which are respectively installed in the two receiving grooves. Each pressure ring abuts against the bottom wall of the receiving groove and is connected to the column.

20. A battery comprising a cover assembly as claimed in any one of claims 1 to 19.

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