Cover plate assembly and battery

Abstract

The utility model provides a cover plate subassembly and battery, the cover plate subassembly includes the cover body, insulation support part and support piece, the cover body is equipped with the explosion-proof valve, the insulation support part and the cover body are arranged oppositely and are attached to each other, the insulation support part is equipped with the exhaust port corresponding to the explosion-proof valve, the support piece is installed on the insulation support part, and the support piece is attached to the explosion-proof valve. The supporting piece is located between the cover body and the core bag, and the melting temperature of the supporting piece is larger than that of the insulating supporting part, so that after the insulating supporting part is melted, the supporting piece can keep the structural integrity of the supporting piece, the cover body and the core bag are supported, the core bag is prevented from being directly and tightly attached to the cover body, and the risk that the anti-explosion valve is blocked is avoided; and normal opening of the explosion-proof valve is ensured to discharge high-temperature and high-pressure gas, so that the risk of battery cell explosion is greatly reduced.

Description

Technical Field

[0001] This utility model relates to the field of energy storage technology, specifically to a cover plate assembly and a battery. Background Technology

[0002] 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 of the cover assembly is used to hold the top of the cell pack in place. However, when the battery runs out of control and the temperature becomes too high, the insulating support will completely melt, leaving no support between the cell pack and the cover assembly. This causes the cell pack to fit tightly against the cover, blocking the explosion-proof valve. Consequently, the explosion-proof valve loses its pressure relief function, and the large amount of gas generated during cell failure cannot be released from the explosion-proof valve, causing the cell to swell and explode, resulting in a safety accident. Utility Model Content

[0003] The present invention provides a cover plate assembly and a battery, which enables the support member to maintain its structural integrity after the insulating support part melts, thereby supporting the cover and the core package, preventing the core package from being directly and tightly attached to the cover, avoiding the risk of the explosion-proof valve being blocked, ensuring that the explosion-proof valve can open normally to discharge high-temperature and high-pressure gas, and greatly reducing the risk of cell explosion.

[0004] In a first aspect, embodiments of the present invention provide a cover plate assembly.

[0005] In one embodiment, the cover plate assembly includes:

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

[0007] 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;

[0008] 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.

[0009] In one embodiment, the melting temperature of the support is T, where T ≥ 500°C.

[0010] In one embodiment, the support member is made of ceramic or metal.

[0011] In one embodiment, the insulating support includes:

[0012] A supporting body is disposed opposite to and attached to the cover, and the exhaust port is located on the supporting body;

[0013] 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.

[0014] In one embodiment, the support member is mounted on the support platform.

[0015] In one embodiment, the support platform is provided with a mounting groove, and the support member is installed in the mounting groove.

[0016] In one embodiment, the support member is snapped into the mounting groove, and / or the support member is glued into the mounting groove.

[0017] In one embodiment, 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.

[0018] In one embodiment, the support platform is provided with a plurality of mounting holes, which are spaced apart, and the support member includes a plurality of support columns, which are installed in the plurality of mounting holes.

[0019] In one embodiment, the diameter of the mounting hole is D, wherein 1mm ≤ D ≤ 20mm.

[0020] In one embodiment, 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.

[0021] In one embodiment, the length of the cover is L;

[0022] 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.

[0023] In one embodiment, 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.

[0024] In one embodiment, the cover has two mounting holes along its thickness direction;

[0025] 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.

[0026] 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.

[0027] In one embodiment, the cover assembly further includes two sealing rings, which are respectively fitted onto the two pillars, and each sealing ring is used to seal the gap between the cover and the base.

[0028] In one embodiment, the system further includes two upper plastic rings, which are respectively fitted onto the two columns. At least a portion of the side of each upper plastic ring facing away from the column is used to abut against the inner wall of the corresponding mounting hole.

[0029] In one embodiment, 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 portion, and the two annular abutment arms are respectively fitted onto the two pillars and abut against the inner sidewall of the corresponding mounting hole.

[0030] In one embodiment, the cover body is provided with two mounting grooves on the side opposite to the insulating support, and the bottom wall of each mounting groove is provided with the mounting hole through it;

[0031] The two annular bodies are respectively installed in the two mounting slots.

[0032] In one embodiment, each of the annular bodies has an annular protrusion on the side opposite to the cover, the annular protrusion being arranged opposite to and spaced apart from the column, so that a receiving groove is formed between the annular protrusion and the column.

[0033] 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.

[0034] Secondly, this application also provides a battery, the battery including the cover assembly as described above.

[0035] The beneficial effects of the embodiments of this utility model are as follows:

[0036] In embodiments of this invention, the insulating support is disposed opposite to and attached to the cover, and has an exhaust port corresponding to the explosion-proof valve. This means that under normal circumstances, it can provide necessary support and ensure that the explosion-proof valve can open 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 via the explosion-proof valve. Furthermore, during thermal runaway, the temperature of the gas discharged from the core package is too high, causing the insulating support to completely melt. However, because the melting temperature of the support member installed on the insulating support is higher than that of the insulating support, even after the insulating support is completely melted, the support member can maintain its structural integrity, thereby separating the cover and the core package, preventing the core package from directly and tightly fitting the cover, avoiding the risk of the explosion-proof valve being blocked, ensuring that the explosion-proof valve can open normally to discharge high-temperature and high-pressure gas, and greatly reducing the risk of cell explosion. In addition, since the insulating support and the support member can simultaneously support the cover, this design can disperse the force exerted by the core package on the cover, reducing the problem of stress concentration in the cover. 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

[0037] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is an exploded view of the cover plate assembly provided in an embodiment of this utility model;

[0039] Figure 2 yes Figure 1 A magnified view of part D is shown below;

[0040] Figure 3 This is a cross-sectional schematic diagram of the cover plate assembly provided in an embodiment of this utility model;

[0041] Figure 4 yes Figure 3 A magnified view of part A shown below;

[0042] Figure 5 yes Figure 3 The main view;

[0043] Figure 6 yes Figure 5 The enlarged view at point B shown is illustrated in the diagram.

[0044] Figure 7yes Figure 5 A magnified view of a portion at point C is shown.

[0045] Explanation of reference numerals in the attached figures:

[0046] 10. Cover plate assembly;

[0047] 1. Cover body; 11. Mounting hole; 12. Installation slot; 13. Explosion-proof valve;

[0048] 2. Insulation support part; 21. Exhaust port; 22. Support body; 23. Support platform; 231. Mounting groove; 232. Mounting hole; 24. Through hole;

[0049] 3. Support components;

[0050] 4. Support unit; 41. First support unit; 42. Second support unit;

[0051] 5. Pole post; 51. Base; 52. Column;

[0052] 6. Sealing ring;

[0053] 7. Upper plastic ring; 71. Ring body; 72. Ring abutment arm; 73. Ring boss;

[0054] 8. Receiving tank;

[0055] 9. Pressure ring. Detailed Implementation

[0056] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0057] 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 of the cover assembly is used to hold the top of the cell pack in place. However, when the battery runs out of control and the temperature becomes too high, the insulating support will completely melt, leaving no support between the cell pack and the cover assembly. This causes the cell pack to fit tightly against the cover, blocking the explosion-proof valve. Consequently, the explosion-proof valve loses its pressure relief function, and the large amount of gas generated during cell failure cannot be released from the explosion-proof valve, causing the cell to swell and explode, resulting in a safety accident.

[0058] In view of this, the present invention proposes a cover plate assembly. Figures 1 to 6 This is a structural schematic diagram of an embodiment of the cover plate assembly provided by this utility model. After the insulating support part melts, the support member of the cover plate assembly provided by this utility model can maintain its structural integrity, thereby supporting the cover body and the core package, preventing the core package from being directly and tightly attached to the cover body, avoiding the risk of the explosion-proof valve being blocked, ensuring that the explosion-proof valve can open normally to discharge high-temperature and high-pressure gas, and greatly reducing the risk of cell explosion. The cover plate assembly will be described in detail below with reference to the main drawings.

[0059] Reference 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.

[0060] In this embodiment of the invention, 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 the problem of stress concentration in the cover 1. By setting the support member 3, part of the heat generated by the core package will be transferred to the cover 1, and the other part will be transferred to the support member 3. In this way, it helps the heat generated by the core package to dissipate quickly and reduces the risk of local overheating of the core package.

[0061] 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.

[0062] In one embodiment, the melting temperature of the support member 3 is T, where T ≥ 500°C. Thus, when the melting temperature of the support member 3 is set at 500°C or higher, 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°C or higher, 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°C, the support member 3 is prone to melting, increasing the possibility of the core package blocking the explosion-proof valve 13.

[0063] 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.

[0064] In one embodiment, 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 body 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 body 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.

[0065] It should be noted that the metal can include nickel-based alloys, tungsten, molybdenum, tantalum, niobium, etc. Specifically, the material for the support member 3 can be selected as needed, and this application does not limit it.

[0066] Furthermore, the material of the insulating support portion 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 portion 2, the insulating support portion 2 will melt. Of course, in other embodiments, the material of the insulating support portion 2 may also include silicone, epoxy resin, or unsaturated polyester resin glass fiber reinforced molding compound, etc. Specifically, this application does not limit this.

[0067] Reference Figure 1 and Figure 3 In one embodiment, 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 presence 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.

[0068] It should be noted that the support platform 23 can have various shapes. For example, in one embodiment, the support platform 23 can be a cylinder; in another embodiment, the support platform 23 can be an annular shape surrounding the exhaust port. In other embodiments, the support platform 23 can be a cuboid or a cube, etc. Specifically, the shape of the support platform 23 can be selected as needed, and this application does not limit it.

[0069] Reference Figure 3 , Figure 5 and Figure 7In one embodiment, the support member 3 is mounted on the support platform 23, thus making the cover plate assembly 10 structurally compact. Furthermore, 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.

[0070] It should be noted that in other embodiments, the support member 3 can also be installed on the support body 22. Specifically, the specific installation position of the support member 3 can be selected as needed, and this application does not limit it.

[0071] There are several ways to install the support member 3 onto the support platform 23, for example, referring to... Figure 3 , Figure 5 and Figure 7 In one embodiment, the support platform 23 is provided with a mounting groove 231, and the support member 3 is installed in 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, avoiding instability caused by loosening or displacement. The support member 3 is directly installed in the mounting groove 231 of the support platform 23, eliminating the need for complex installation steps and additional fasteners, thus greatly 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 2 and the support member 3. This integrity improves the appearance and reliability of the cover plate assembly 10.

[0072] In one embodiment, the support block is snap-fitted into the mounting groove 231. This snap-fit ​​fixing method ensures that the support block is securely installed in the mounting groove 231, preventing loosening or displacement. The snap-fit ​​fixing 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 ​​fixing method also makes the disassembly process simpler and faster.

[0073] In one embodiment, 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.

[0074] It should be noted that the features of the support member 3 being snapped into the mounting groove 231 and the features of the support member 3 being glued into 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 embodiments, the support block can also be fixed in the mounting groove 231 by screws or magnetic structures, etc. Specifically, this application does not limit this.

[0075] Reference Figure 1 In one embodiment, 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 is covered by the cover 1 after the support member 3 is installed, preventing it 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 it through the slot, thus avoiding complex disassembly steps and additional tool requirements, simplifying the maintenance process and reducing maintenance costs.

[0076] It should be noted that in other embodiments, the groove of the mounting groove 231 may be located away from the cover 1, or the groove of the mounting groove 231 may be located on the side wall where the support platform 23 is connected to the support body 22. Specifically, the specific orientation of the groove of the mounting groove 231 can be set as needed, and this application does not limit it.

[0077] In one embodiment, 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.

[0078] There are several ways to install the support member 3 onto the support platform 23, for example, referring to... Figure 1 and Figure 3In another embodiment, 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, achieve uniform support for the support platform 23. This uniform support design prevents deformation or damage to the support platform 23 due to excessive force at a single point. Furthermore, the pre-designed mounting holes 232 and 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.

[0079] In one embodiment, 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.

[0080] 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.

[0081] Reference Figure 3 and Figure 5 In one embodiment, the support platform 23 and the support member 3 together constitute a support unit 4. At least two support units 4 are provided, and the at least two support units 4 are arranged at intervals. In this way, multi-point support is achieved between the cover 1 and the core package, improving the stability of the support. The interval arrangement of at least two support units 4 allows the load to be distributed more evenly on the cover 1. In addition, it reduces the concentrated stress borne by a single support unit 4, thereby extending the service life of the support unit 4 and the cover 1.

[0082] 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. Specifically, the shape of the support member 3 can be set as needed, and this application does not limit it in this regard.

[0083] It should be noted that the support unit 4 can be two, three, four, or even more. Specifically, 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. Specifically, the number and arrangement of the support units 4 can be adjusted according to the actual scenario and requirements, and this application does not limit this.

[0084] Tabs are commonly used 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 one embodiment, 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 cover and the core package, while avoiding occupying the installation space of the tab, thus simplifying the installation operation of the tab. When the value of a is less than 0.05, although the width of the support unit 4 is relatively narrow, reserving more space for the installation of the tab, 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 installation space of the tab, leading to difficulties in installing the tab.

[0085] Reference Figure 3 and Figure 5 In one embodiment, the plurality of 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, so that high-pressure gas can be discharged from the explosion-proof valve 13 through the exhaust channel when the core package fails thermally. 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.

[0086] Reference Figure 1 , Figure 4 and Figure 6In one embodiment, 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 includes a base 51 and a column 52 protruding from the base 51. The peripheries of the two bases 51 abut against the inner sidewalls of the two through holes 24, so that the through holes 24 can radially limit the bases 51 and prevent the pole posts 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, which facilitates the subsequent connection operation of the pole posts 5 to other components.

[0087] Reference Figure 4 and Figure 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.

[0088] Reference Figure 1 , Figure 3 and Figure 6 In one embodiment, the cover assembly 10 further includes two sealing rings 6, which are respectively fitted onto the two pillars 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 pillars 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 pillars 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 can 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 pillars 52 without complicated operations.

[0089] Reference Figure 1 and Figure 3In one embodiment, the cover assembly 10 further includes two upper plastic rings 7, which are respectively fitted onto 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 abutment 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, 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.

[0090] Reference Figure 1 , Figure 4 and Figure 6 In one embodiment, 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 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 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.

[0091] Reference Figure 1In one embodiment, 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. This design of the mounting grooves 12 provides a precise installation position for the annular bodies 71, ensuring that they can be accurately installed in the predetermined position and avoiding problems such as positional deviation or insecure installation. Due to the presence of the mounting grooves 12, the annular bodies 71 can be easily embedded into each groove 12, facilitating the contact between the annular abutment arm 72 and 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.

[0092] Reference Figure 1 In one embodiment, 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 make tight 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.

[0093] The present invention also proposes a battery, which includes a cover plate assembly 10 as described above. The specific structure of the cover plate assembly 10 is as described in the above embodiments. Since the present battery adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0094] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A cover plate assembly, characterized in that, include: 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 according to claim 1, characterized in that, The melting temperature of the support component is T, where T ≥ 500℃.

3. The cover plate assembly according to claim 2, characterized in that, The support component is made of ceramic or metal.

4. The cover plate assembly according to claim 1, characterized in that, 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 according to claim 4, characterized in that, The support member is mounted on the support platform.

6. The cover plate assembly according to claim 5, characterized in that, The support platform is provided with a mounting groove, and the support member is installed in the mounting groove.

7. The cover plate assembly according to claim 6, characterized in that, 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 according to claim 6, characterized in that, 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 according to claim 5, characterized in that, 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 according to claim 9, characterized in that, The diameter of the mounting hole is D, where 1mm ≤ D ≤ 20mm.

11. The cover plate assembly according to any one of claims 4 to 10, characterized in that, 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 according to claim 11, characterized in that, 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 according to claim 11, characterized in that, 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 according to any one of claims 1 to 10, characterized in that, 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, characterized in that, The cover assembly also includes two sealing rings, which are respectively fitted onto the two pillars, and each sealing ring is used to seal the gap between the cover and the base.

16. The cover plate assembly according to claim 14, characterized in that, It also includes two upper plastic rings, which are respectively fitted onto the two columns. At least part of the side of each upper plastic ring facing away from the column is used to abut against the inner wall of the corresponding mounting hole.

17. The cover plate assembly according to claim 16, characterized in that, 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 pillars and abut against the inner wall of the corresponding mounting hole.

18. The cover plate assembly according to claim 17, characterized in that, 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 according to claim 17, characterized in that, 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, characterized in that, Includes the cover plate assembly as described in any one of claims 1 to 19.

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