Cover plate assembly and single battery

Abstract

The application relates to the technical field of battery manufacturing, and provides a cover plate assembly and a single battery. The cover plate assembly comprises a top cover and a support arranged below the top cover, and an exhaust cavity is formed between the top cover and the support; a pressure relief valve is arranged on the top cover, a communication part for communicating the exhaust cavity and the inside of the single battery is arranged on the support, and the pressure relief valve and the communication part are communicated through the exhaust cavity; a fire extinguishing part is arranged in the exhaust cavity, and the fire extinguishing part is used for blocking the thermal runaway flame from being discharged from the pressure relief valve. The application can block the thermal runaway flame of the single battery from being discharged, and can improve the use safety of a battery pack.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, and in particular to a cover plate assembly and a single battery cell. Background Technology

[0002] With the development of new energy technologies, the safety of battery packs has become increasingly important. Among the safety issues of battery packs, thermal runaway is a common problem. When a single cell in the battery pack experiences thermal runaway, extremely hot flames and fumes can be ejected from the cell's explosion-proof valve, easily causing safety problems and adverse effects.

[0003] Therefore, in related technologies, fire extinguishing components are installed in the battery pack casing to prevent the flames and smoke generated by thermal runaway from spreading outward and reduce the impact of thermal runaway. However, installing fire extinguishing components in the battery pack casing can only prevent thermal runaway from spreading outside the battery pack, but cannot prevent thermal runaway from spreading inside the battery pack, which is not conducive to improving the safety of battery pack use. Utility Model Content

[0004] In view of this, this application aims to provide a cover assembly that can improve the safety of battery pack use.

[0005] To achieve the above objectives, the technical solution of this application is implemented as follows: A cover assembly includes a top cover and a bracket disposed below the top cover, wherein an exhaust chamber is formed between the top cover and the bracket; The top cover is provided with a pressure relief valve, and the bracket is provided with a connecting part that connects the exhaust chamber and the interior of the single battery cell, and the pressure relief valve and the connecting part are connected through the exhaust chamber; The exhaust chamber is equipped with a fire extinguishing component, which is used to prevent thermal runaway flames from being discharged from the pressure relief valve.

[0006] Furthermore, a portion of the bracket protrudes away from the top cover and a groove is formed on the side of the bracket facing the top cover; the connecting portion is disposed through the bottom wall of the groove, and the exhaust chamber is formed between the top cover and the groove.

[0007] Furthermore, the connecting portion includes a plurality of connecting holes disposed through the bottom wall of the groove.

[0008] Furthermore, the bracket includes connecting portions disposed on both sides of the groove along the length direction of the bracket, and the connecting portions are connected to the top cover; both ends of the connecting portions along the length direction of the bracket are provided with flanges extending away from the top cover, and the flanges are used to abut against the casing of the single battery cell.

[0009] Furthermore, a reinforcing rib is provided between the sidewall and bottom wall of the groove.

[0010] Furthermore, the fire extinguishing component is a fire extinguishing disc.

[0011] Furthermore, the fire extinguishing disc is located on the communication path between the pressure relief valve and the connecting part; and / or, the fire extinguishing disc is provided corresponding to the connecting part, and the pressure relief valve is respectively provided at both ends of the fire extinguishing disc in the length direction of the bracket.

[0012] Furthermore, the cross-sectional profile and / or longitudinal profile of the fire extinguishing disc are rectangular.

[0013] Furthermore, the fire extinguishing disc is provided with a clearance hole for avoiding the pressure relief valve; and / or, the fire extinguishing disc is a perfluorohexanone fire extinguishing disc.

[0014] Compared with related technologies, this application has the following advantages: (1) The cover plate assembly described in this application forms a flow channel for gas and smoke generated by thermal runaway of a single cell through the arrangement of an exhaust chamber, a pressure relief valve and a connecting part, thereby reducing the risk of explosion. Furthermore, the fire extinguishing component installed in the exhaust chamber can block the thermal runaway flame from being discharged from the pressure relief valve, which helps to reduce the impact of thermal runaway of a single cell on adjacent single cells, thereby reducing the spread of thermal runaway and improving the safety of the battery pack.

[0015] (2) By forming a groove on the support and placing the connecting part on the bottom wall of the groove, it is convenient to form an exhaust chamber, and it helps to buffer the gas generated by thermal runaway, and facilitates the formation of a gas flow channel. The structure is simple and easy to design and implement.

[0016] (3) By making the connecting part include multiple connecting holes that are provided through the bottom wall of the groove, it is easy to achieve the connecting effect of the connecting part, and the structure is simple and easy to process and manufacture.

[0017] (4) The connection part facilitates the assembly of the bracket on the top cover, and the flange facilitates the assembly of the cover plate assembly on the single battery. The flange and the housing abutment can guide and position the cover plate assembly on the housing, which is conducive to design implementation.

[0018] (5) By setting reinforcing ribs between the sidewall and bottom wall of the groove, the structural strength at the connection between the sidewall and the bottom wall is improved, which helps to withstand the impact of thermal runaway gas and facilitates design implementation.

[0019] (6) By using fire extinguishing discs for the fire extinguishing components, it is easier to arrange the fire extinguishing components in the exhaust chamber. At the same time, the fire extinguishing discs can be triggered by the high temperature of the flames and gases generated by thermal runaway, thereby achieving the fire extinguishing effect and making it easier to achieve the setting effect of the fire extinguishing components.

[0020] (7) By placing the fire extinguishing disc on the connecting path between the pressure relief valve and the connecting part, the flame and gas generated by thermal runaway can pass through the fire extinguishing disc, which helps to better block the flame of thermal runaway by the fire extinguishing disc, which is conducive to design and implementation. At the same time, by setting the fire extinguishing disc to correspond to the connecting part and setting pressure relief valves at both ends of the fire extinguishing disc, two pressure relief paths can be formed, which makes it easier for the gas generated by thermal runaway to trigger the fire extinguishing disc, which is conducive to design and implementation.

[0021] (8) By making the cross-sectional profile and longitudinal profile of the fire extinguishing plate both rectangular, it is convenient to process and manufacture the fire extinguishing plate, and it can make the fire extinguishing plate have a flat installation surface, which is convenient for the fire extinguishing plate to be assembled on the cover plate assembly.

[0022] (9) By setting clearance holes on the fire extinguishing disc, it is easy to arrange the fire extinguishing disc around the pressure relief valve, which is conducive to adapting to the fire extinguishing disc arrangement requirements under different conditions. At the same time, by making the fire extinguishing disc a perfluorohexanone fire extinguishing disc, it is easy to process and manufacture, and has a good fire extinguishing effect, which is conducive to design and implementation.

[0023] Another object of this application is to provide a single cell battery, including the cover assembly as described above.

[0024] The single battery described in this application, through the arrangement of the cover plate assembly as described above, has the same beneficial effects as the cover plate assembly described above compared to the prior art, so it will not be described again here. Attached Figure Description

[0025] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1 This is an exploded view of the cover plate assembly described in the embodiments of this application; Figure 2 for Figure 1 Enlarged view of section A in the image; Figure 3 This is a top view of the cover plate assembly described in an embodiment of this application; Figure 4 When this is one embodiment of the fire extinguishing disc described in the present application, Figure 3 Cross-sectional view at point AA; Figure 5 When this is another embodiment of the fire extinguishing disc described in the embodiments of this application... Figure 3Cross-sectional view at point AA; Figure 6 This is a schematic diagram of the cover plate assembly assembled in a single battery cell according to an embodiment of this application; Explanation of reference numerals in the attached figures: 1. Cover plate assembly; 101. Top cover; 102. Bracket; 103. Exhaust chamber; 1021. Groove; 1022. Connecting part; 1023. Flanged edge; 2. Pressure relief valve; 3. Connecting parts; 301. Connecting hole; 4. Fire extinguishing components; 5. Reinforcing ribs; 6. Shell. Detailed Implementation

[0026] To make the technical solution and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0027] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0028] Furthermore, it should be noted that in the description of this application, if terms such as "upper," "lower," "inner," or "outer" appear, indicating orientation or positional relationship, these are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this application 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 on this application. In addition, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] Furthermore, in the description of this application, unless otherwise expressly defined, the terms "installation," "connection," "joining," and "connector" 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 between two components. Those skilled in the art can understand the specific meaning of the above terms in this application in light of the specific circumstances.

[0030] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0031] The present application will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.

[0032] An embodiment of the first aspect of this application provides a cover assembly applied in the manufacture of single-cell batteries. It is mainly used to cover the casing of single-cell batteries. Furthermore, the cover assembly in this embodiment, with its innovative structural design, can block the emission of thermal runaway flames, thereby improving the safety of the battery pack.

[0033] In related technologies, with the development of new energy technologies, the safety of battery packs has become increasingly important. Among the safety issues of battery packs, thermal runaway is a common problem. When a single cell in the battery pack experiences thermal runaway, extremely hot flames and fumes can be ejected from the explosion-proof valve of the single cell, which can easily cause safety problems and have adverse effects.

[0034] Therefore, in related technologies, fire extinguishing components are installed in the battery pack casing to achieve self-extinguishing through the fire extinguishing effect of the components, thereby preventing the flames and smoke generated by thermal runaway from spreading outward and reducing the impact of thermal runaway. However, installing fire extinguishing components in the battery pack casing can only prevent thermal runaway from spreading outside the battery pack, but cannot prevent thermal runaway from spreading inside the battery pack. Furthermore, when individual cells in the battery pack experience thermal runaway in sequence due to the influence of thermal spread, the fire extinguishing effect of the fire extinguishing components installed on the casing is difficult to guarantee that it can completely prevent the thermal runaway flames from spreading outside the battery pack, which is not conducive to improving the safety of battery pack use.

[0035] In view of this, in order to overcome the shortcomings of the related technology, in the cover plate assembly 1 of this embodiment, combined with Figures 1 to 6 As shown, the overall design includes a top cover 101, a bracket 102, and an exhaust chamber 103.

[0036] The top cover 101 is equipped with a pressure relief valve 2, the bracket 102 is located below the top cover 101, the exhaust chamber 103 is formed between the bracket 102 and the top cover 101, the bracket 102 is equipped with a connecting part 3 that connects the exhaust chamber 103 and the inside of the single battery, and the pressure relief valve 2 and the connecting part 3 are connected through the exhaust chamber 103. A fire extinguishing component 4 is provided in the exhaust chamber 103, which is used to prevent thermal runaway flames from being discharged from the pressure relief valve 2.

[0037] At this time, as described above, the exhaust chamber 103, the pressure relief valve 2, and the connecting part 3 form a flow channel for the gas and smoke generated by the thermal runaway of a single battery cell, reducing the risk of explosion. Furthermore, the fire extinguishing component 4 installed in the exhaust chamber 103 can block the thermal runaway flame from being discharged from the pressure relief valve 2, thereby helping to reduce the impact of the thermal runaway of a single battery cell on adjacent single batteries, thus reducing the spread of thermal runaway and improving the safety of the battery pack.

[0038] Based on the above general introduction, specifically, the cover plate assembly 1 in this embodiment generally covers the casing 6 of the individual battery cell.

[0039] The above-mentioned single battery typically includes a housing 6 with a receiving cavity and an electrode assembly disposed within the housing 6. In a specific implementation, the above-mentioned cover plate assembly 1 covers the top of the housing 6, and the cover plate assembly 1 is provided with a terminal post for cooperating with the electrode assembly. The connection form between the above-mentioned cover plate assembly 1 and the housing 6 can be referred to, for example, the connection form between the cover plate assembly 1 and the housing 6 of the existing single battery, and will not be described in detail here.

[0040] The cover plate assembly 1 is provided with a terminal post through hole to match the terminal post. The terminal post is located in the terminal post through hole and is connected to the positive and negative terminals of the electrode group. The arrangement of the terminal post through hole and the connection between the terminal post and the electrode group can be referred to the arrangement of the terminal post through hole and the connection between the terminal post and the electrode group in the existing single cell, and will not be described again here.

[0041] Furthermore, when thermal runaway occurs in the electrode assembly within the aforementioned individual battery cells, the gases, flames, and smoke generated by the thermal runaway all enter the exhaust chamber 103 through the connecting part 3, and after passing through the fire extinguishing component 4, are discharged from the pressure relief valve 2. The aforementioned fire extinguishing component 4 may be configured as a component that releases a fire extinguishing agent triggered by the temperature generated by the thermal runaway, such as a fire extinguishing disc or other fire extinguishing component 4.

[0042] Continue to combine Figures 1 to 6 As shown, in some exemplary embodiments, this embodiment may, for example, cause a portion of the bracket 102 to protrude away from the top cover 101, and form a groove 1021 on the side of the bracket 102 facing the top cover 101, with the connecting portion 3 disposed through the bottom wall of the groove 1021, and the exhaust chamber 103 formed between the top cover 101 and the groove 1021.

[0043] It is understandable that by forming a groove 1021 on the support 102 and placing the connecting part 3 on the bottom wall of the groove 1021, it is convenient to form the exhaust chamber 103, and it helps to buffer the gas generated by thermal runaway, and facilitates the formation of the gas flow channel. The structure is simple and easy to design and implement.

[0044] In specific implementation, the groove 1021 on the bracket 102 can be formed by stamping, for example, to facilitate the processing and manufacturing of the bracket 102. The groove 1021 includes a side wall and a bottom wall. The exhaust chamber 103 is formed by the top cover 101, the side wall and the bottom wall, and the pressure relief valve 2 is correspondingly provided in the area of ​​the top cover 101 forming the exhaust chamber 103.

[0045] Continue to combine Figures 1 to 6 As shown, in some exemplary embodiments, this embodiment may, for example, include a plurality of through holes 301 disposed on the bottom wall of the groove 1021.

[0046] It is understandable that by making the connecting part 3 include a plurality of connecting holes 301 that are provided through the bottom wall of the groove 1021, the connecting part 3 can easily achieve the connecting effect, and the structure is simple and easy to process and manufacture.

[0047] In practical implementation, the bottom wall of the groove 1021 can be set in a grid pattern, and the connecting hole 301 can be a mesh. Of course, in addition to being a mesh, the connecting hole 301 can also be spaced along the length and width of the support 102. The shape of the connecting hole 301 can be any one or a combination of round holes, rectangular holes, strip holes, elliptical holes or irregular holes. In actual implementation, it needs to be set according to the design requirements of the cover plate assembly 1.

[0048] Continue to combine Figures 1 to 6 As shown, in some exemplary embodiments, this embodiment may, for example, include a connecting portion 1022 provided on both sides of the groove 1021 along the length direction of the bracket 102. The connecting portion 1022 is connected to the top cover 101. Both ends of the connecting portion 1022 along the length direction of the bracket 102 are provided with flanges 1023 extending away from the top cover 101. The flanges 1023 are used to abut against the housing 6 of the single battery cell.

[0049] It is understandable that the connection part 1022 facilitates the assembly of the bracket 102 on the top cover 101, and the flange 1023 facilitates the assembly of the cover assembly 1 on the single battery cell. Furthermore, the flange 1023 abuts against the housing 6, thereby guiding and positioning the cover assembly 1 on the housing 6, which is beneficial for design implementation.

[0050] In a specific implementation, the bracket 102 can be configured to match the shape of the top cover 101, the connecting part 1022 can be glued to the top cover 101, and the flange 1023 is provided on both sides of the bracket 102 along the length direction of the bracket 102 and extends away from the top cover 101.

[0051] Continue to combine Figures 1 to 6 As shown, in some exemplary embodiments, this embodiment may, for example, provide a reinforcing rib 5 between the sidewall and bottom wall of the groove 1021.

[0052] It is understandable that by setting a reinforcing rib 5 between the side wall and the bottom wall of the groove 1021, the structural strength at the connection between the side wall and the bottom wall can be improved, which helps to withstand the impact of thermal runaway gas and facilitates design implementation.

[0053] In specific implementation, the above-mentioned reinforcing ribs 5 can be arranged in the form of triangular plates, and the reinforcing ribs 5 are provided on the side wall of the groove 1021 and connected to the bottom wall of the groove 1021. In actual implementation, the reinforcing ribs 5 can be multiple plates arranged at intervals along the side wall of the bracket 102.

[0054] Continue to combine Figures 1 to 6 As shown, in some exemplary embodiments, this embodiment may, for example, make the fire extinguishing component 4 a fire extinguishing disc.

[0055] It is understandable that by using a fire extinguishing disc for the fire extinguishing component 4, it is easier to arrange the fire extinguishing component 4 in the exhaust chamber 103. At the same time, the fire extinguishing disc can be triggered by the high temperature of the flame and gas generated by thermal runaway, thereby achieving the fire extinguishing effect and making it easier to achieve the setting effect of the fire extinguishing component 4.

[0056] In practical implementation, the above-mentioned fire extinguishing pad may include a substrate and a fire extinguishing agent disposed on the substrate. The substrate has multiple receiving holes, in which the fire extinguishing agent is stored and can be triggered by the high temperature generated by thermal runaway, and released into the exhaust chamber 103 to achieve the fire extinguishing effect. The above-mentioned fire extinguishing agent can refer to the fire extinguishing agents used in existing battery packs (such as heptafluoropropane), and will not be described in detail here.

[0057] Continue to combine Figures 1 to 6 As shown, in some exemplary embodiments, this embodiment may, for example, cause the fire extinguishing disc to block the communication path between the pressure relief valve 2 and the connecting part 3.

[0058] It is understandable that by positioning the fire extinguishing disc on the connecting path between the pressure relief valve 2 and the connecting part 3, the flames and gases generated by thermal runaway can pass through the fire extinguishing disc, which helps to better block the thermal runaway flames and facilitates design and implementation.

[0059] In practical implementation, along the height direction of the cover plate assembly, the projection area of ​​the pressure relief valve 2 is located within the projection area of ​​the fire extinguishing disc, and the fire extinguishing disc is located on the communication path between the pressure relief valve 2 and the communication part 3. Specifically, the fire extinguishing disc is supported between the support 102 and the top cover 101 by a support column extending from the support 102 to the top cover 101, and the edge of the fire extinguishing disc and the support 102 can allow gas generated by thermal runaway to pass through.

[0060] When the extinguishing disc is affected by the high temperature generated by thermal runaway, the extinguishing agent will be released into the exhaust chamber 103. When the gas pressure in the single cell is too high, it will still be discharged through the pressure relief valve 2. At this time, the extinguishing agent takes effect during the discharge process, achieving the extinguishing effect, blocking the flame from being discharged, and reducing the temperature of the thermal runaway gas, thereby reducing the impact of the thermal runaway gas discharge from the single cell.

[0061] Continue to combine Figures 1 to 6 As shown, in some exemplary embodiments, this embodiment may, for example, have a fire extinguishing disc corresponding to the connecting portion 3, and pressure relief valves 2 respectively provided at both ends of the fire extinguishing disc along the length of the bracket 102.

[0062] It is understandable that by setting the fire extinguishing disc to correspond to the connecting part 3 and setting pressure relief valves 2 at both ends of the fire extinguishing disc, two exhaust paths can be formed in the exhaust chamber 103, which facilitates the triggering of the fire extinguishing disc by the gas generated by thermal runaway, and is conducive to design and implementation.

[0063] In practice, the fire extinguishing disc is installed on the top cover 101 and corresponding to the connecting part 3. When the individual battery thermally runs away, the generated gas enters the exhaust chamber 103 from the connecting part 3, which makes it easier to trigger the fire extinguishing disc to generate the fire extinguishing agent. It can also discharge some of the gas generated by thermal runaway through the pressure relief valve 2, reduce the gas pressure in the individual battery, and prevent explosion.

[0064] Continue to combine Figures 1 to 6 As shown, in some exemplary embodiments, this embodiment may, for example, make the cross-sectional profile and longitudinal profile of the fire extinguishing disc rectangular.

[0065] It is understandable that by making the cross-sectional and longitudinal profiles of the fire extinguishing disc rectangular, it is easier to process and manufacture the fire extinguishing disc, and it can also make the fire extinguishing disc have a flat mounting surface, which facilitates the assembly of the fire extinguishing disc on the cover plate assembly 1.

[0066] In practical implementation, the cross-sectional and longitudinal profiles of the above fire extinguishing discs can be rectangular, circular, elliptical, rounded rectangle, racetrack-shaped, or irregular in shape, as long as they can be installed in the exhaust system.

[0067] Continue to combine Figures 1 to 6As shown, in some exemplary embodiments, this embodiment may, for example, provide a clearance hole on the fire extinguishing disc for avoiding the pressure relief valve 2.

[0068] It is understandable that by setting avoidance holes on the fire extinguishing disc, it is easier to arrange the fire extinguishing disc around the pressure relief valve 2, which is conducive to adapting to the fire extinguishing disc arrangement requirements under different conditions.

[0069] In practical implementation, the above fire extinguishing discs can be arranged around the pressure relief valve 2 through the clearance hole. At this time, the clearance hole is matched with the pressure relief valve 2. When the thermal runaway gas enters the exhaust chamber 103 and is discharged from the pressure relief valve 2, the fire extinguishing discs arranged around the pressure relief valve 2 are easily triggered by the flame and gas generated by the thermal runaway, releasing the fire extinguishing agent.

[0070] Continue to combine Figures 1 to 6 As shown, in some exemplary embodiments, this embodiment may, for example, make the fire extinguishing pad a perfluorohexanone fire extinguishing pad.

[0071] Understandably, using perfluorohexanone extinguishing tablets makes them easier to manufacture, provides good fire extinguishing performance, and facilitates design and implementation.

[0072] It is worth noting that, regarding the cover plate assembly 1 of this embodiment, based on the above exemplary embodiments, in specific implementation, as a preferred embodiment, it is still composed of... Figures 1 to 6 As shown, it may include, for example, a top cover 101, a bracket 102, and an exhaust chamber 103 disposed between the top cover 101 and the bracket 102.

[0073] The top cover 101 is equipped with a pressure relief valve 2, and the bracket 102 is located below the top cover 101. The bracket 102 is equipped with a connecting part 3 that connects the exhaust chamber 103 and the inside of the single battery. The pressure relief valve 2 and the connecting part 3 are connected through the exhaust chamber 103. The exhaust chamber 103 is equipped with a fire extinguishing component 4, which is used to prevent thermal runaway flames from being discharged from the pressure relief valve 2.

[0074] The bracket 102 protrudes away from the top cover 101 and forms a groove 1021 on the side of the bracket 102 facing the top cover 101. The connecting part 3 includes a plurality of connecting holes 301 that pass through the bottom wall of the groove 1021. The groove 1021 has connecting parts 1022 on both sides. The connecting parts 1022 have flanges 1023 extending away from the top cover 101 on both sides along the length of the bracket 102.

[0075] The exhaust chamber 103 is formed between the top cover 101 and the groove 1021, and a reinforcing rib 5 is provided between the side wall and the bottom wall of the groove 1021. The fire extinguishing component 4 is attached to the top cover 101, and the fire extinguishing component 4 is a perfluorohexanone fire extinguishing disc with a rectangular cross section and longitudinal section. There are two pressure relief valves 2 on the top cover 101, and the fire extinguishing disc is attached between the two pressure relief valves 2.

[0076] In the preferred embodiment of the cover plate assembly 1 above, the specific settings and arrangements of the top cover 101, bracket 102, exhaust chamber 103, etc. can still be referred to the descriptions in the above exemplary embodiments. Furthermore, in this preferred embodiment, the beneficial effects brought about by the design of the top cover 101, bracket 102, and exhaust chamber 103, etc., can also be referred to the descriptions in the above exemplary embodiments.

[0077] The cover assembly 1 of this embodiment adopts the above design. Through the arrangement of the exhaust chamber 103, the pressure relief valve 2 and the connecting part 3, a flow channel for the gas and smoke generated by the thermal runaway of a single cell is formed, reducing the risk of explosion. Furthermore, the fire extinguishing component 4 installed in the exhaust chamber 103 can block the thermal runaway flame from being discharged from the pressure relief valve 2, which helps to reduce the impact of the thermal runaway of a single cell on adjacent cells, thereby reducing the spread of thermal runaway and improving the safety of the battery pack.

[0078] An embodiment of the second aspect of this application provides a single battery cell that includes the cover assembly 1 from the embodiment of the first aspect of this application.

[0079] In this embodiment, the single-cell battery includes a housing 6, an electrode assembly disposed within the housing 6, and a cover plate assembly 1 sealing the housing 6. The connection between the housing 6 and the cover plate assembly 1 can be referred to the connection of the cover plate assembly 1 in existing single-cell batteries, and will not be described again here.

[0080] The single battery cell in this embodiment is configured with the cover plate assembly 1 as described above.

[0081] The above descriptions are merely some embodiments of this application and are not intended to limit this application. The technical features or structures in the foregoing different embodiments can be arbitrarily combined to form other specific technical solutions as needed. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this application should be included within the protection scope of the claims of this application.

Claims

1. A cover plate assembly, characterized in that: It includes a top cover and a bracket disposed below the top cover, with an exhaust chamber formed between the top cover and the bracket; The top cover is provided with a pressure relief valve, and the bracket is provided with a connecting part that connects the exhaust chamber and the interior of the single battery cell, and the pressure relief valve and the connecting part are connected through the exhaust chamber; The exhaust chamber is equipped with a fire extinguishing component, which is used to prevent thermal runaway flames from being discharged from the pressure relief valve.

2. The cover plate assembly according to claim 1, characterized in that: A portion of the bracket protrudes away from the top cover and a groove is formed on the side of the bracket facing the top cover; The connecting portion is disposed through the bottom wall of the groove, and the exhaust chamber is formed between the top cover and the groove.

3. The cover plate assembly according to claim 2, characterized in that: The connecting portion includes a plurality of connecting holes disposed through the bottom wall of the groove.

4. The cover plate assembly according to claim 2, characterized in that: The bracket includes connecting portions disposed on both sides of the groove along the length direction of the bracket, and the connecting portions are connected to the top cover; Both ends of the connecting part along the length of the bracket are provided with flanges extending away from the top cover, and the flanges are used to abut against the casing of the single battery cell.

5. The cover plate assembly according to claim 2, characterized in that: A reinforcing rib is provided between the sidewall and bottom wall of the groove.

6. The cover plate assembly according to any one of claims 1-5, characterized in that: The fire extinguishing component is a fire extinguishing disc.

7. The cover plate assembly according to claim 6, characterized in that: The fire extinguishing disc is located on the communication path between the pressure relief valve and the connecting part; and / or The fire extinguishing disc is provided corresponding to the connecting part, and the pressure relief valve is provided at both ends of the fire extinguishing disc in the length direction of the bracket.

8. The cover plate assembly according to claim 6, characterized in that: The cross-sectional profile and / or longitudinal profile of the fire extinguishing disc are rectangular.

9. The cover plate assembly according to claim 6, characterized in that: The fire extinguishing disc is provided with a clearance hole for avoiding the pressure relief valve; and / or, The fire extinguishing pad is a perfluorohexanone fire extinguishing pad.

10. A single-cell battery, characterized in that: The cover assembly includes any one of claims 1-9.

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