Cover plate assembly and battery cell
Patent Information
- Application Number
- CN202611435387.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-09-16
- Publication Date
- 2026-10-27
AI Technical Summary
[0005]有鉴于此，本申请提供一种盖板组件及电芯，以在一定程度上解决电芯热失控时极组窜动会遮挡防爆阀的问题
[0016]本申请的所述盖板组件包括防爆阀、盖板本体、支撑架和绝缘片，所述盖板本体开设有沿第一方向贯穿所述盖板本体的安装口，所述防爆阀设置在所述安装口内；所述支撑架包括支撑环和多个支座，所述支座自所述支撑环在所述第一方向上面对所述盖板本体的一侧凸出，多个所述支座均与所述盖板本体连接，定义与所述第一方向垂直的平面为投影平面，所述防爆阀沿所述第一方向在所述投影平面上的投影位于所述支撑环沿所述第一方向在所述投影平面上的投影的内侧；所述绝缘片包括贴合部和绝缘环，所述贴合部与所述盖板本体面对所述支撑环的一侧贴合，所述绝缘环覆盖所述支撑环背对所述盖板本体的一侧。贴合部能够实现极组与盖板本体之间的绝缘，绝缘环能够实现极组与支撑架之间的绝缘。在电芯发生热失控时，支撑架支撑极组，高温气体可以经支撑环围设出的流通口流向防爆阀，进而通过防爆阀排出。如此，在发生热失控时，支撑架能够支撑极组，避免了极组遮挡防爆阀，保证了防爆阀的排气效果，提升了电芯的安全性能。
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Figure CN122992243A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery technology, and in particular to a cover plate assembly and a battery cell. Background Technology
[0002] Lithium-ion batteries are widely used in various fields such as transportation power supply, power storage, new energy storage power supply, aerospace and military industries due to their advantages such as large capacity, high operating voltage, strong charge retention capability, and long cycle life. A typical energy storage cell includes a cover plate, casing, bare cell, insulating film, side plates, electrode assembly, and electrolyte.
[0003] Energy storage cells generally have a large capacity and higher safety requirements. Their positive and negative terminals can be set on the same cover plate, and the explosion-proof valve is set on the opposite cover plate to achieve thermal and electrical separation and improve the safety performance of the cell.
[0004] However, when thermal runaway occurs in the battery cell, the explosion-proof valve opens to release pressure and exhaust gas. As the pressure decreases, the electrode assembly will move towards the explosion-proof valve under the impact of the high-temperature and high-pressure airflow inside the battery cell. This causes the front end of the electrode assembly to block the explosion-proof valve, which will significantly reduce the exhaust effect of the explosion-proof valve and thus weaken the safety performance of the battery cell. Summary of the Invention
[0005] In view of this, this application provides a cover plate assembly and a battery cell to solve, to some extent, the problem that electrode movement during battery cell thermal runaway can block the explosion-proof valve.
[0006] According to one aspect of this application, a cover plate assembly is provided, the cover plate assembly including an explosion-proof valve, a cover plate body, a support frame and an insulating sheet, the cover plate body having an installation port extending through the cover plate body in a first direction, and the explosion-proof valve being disposed in the installation port; The support frame includes a support ring and multiple supports. The supports protrude from the side of the support ring facing the cover plate body in the first direction. All of the multiple supports are connected to the cover plate body. The plane perpendicular to the first direction is defined as the projection plane. The projection of the explosion-proof valve on the projection plane along the first direction is located inside the projection of the support ring on the projection plane along the first direction. The insulating sheet includes an adhesive portion and an insulating ring. The adhesive portion is attached to the side of the cover plate body facing the support ring, and the insulating ring covers the side of the support ring facing away from the cover plate body.
[0007] Preferably, the cover plate body has multiple grooves, which are recessed into the interior of the cover plate body from the side facing the support ring. Each groove corresponds to a support, and a portion of the support is inserted into the corresponding groove so that the support ring and the cover plate body are arranged at intervals. The support is bonded to the groove wall of the corresponding groove through an adhesive part.
[0008] Preferably, the insulating sheet further includes a connector, one end of which is connected to the mating portion in the first direction, and the other end of which is connected to the insulating ring in the first direction, and the connector is provided with an exhaust port.
[0009] Preferably, a plurality of supports are arranged around the explosion-proof valve, and an exhaust channel is formed between two adjacent supports. Each exhaust channel is provided with an exhaust port, and the exhaust channel is directly opposite the exhaust port corresponding to the exhaust channel.
[0010] Preferably, the effective opening area of the explosion-proof valve is A plane perpendicular to the first direction is defined as the projection plane, and the area of the outer contour of the support ring projected onto the projection plane along the first direction is... , and satisfy: .
[0011] Preferably, the contact area between the support and the adhesive portion is... , and satisfy: .
[0012] Preferably, the cover plate assembly further includes a plurality of first adhesive backing portions, which are bonded to the cover plate body on one side in the first direction and to the bonding portion on the other side in the first direction, and the plurality of first adhesive backing portions are arranged at intervals.
[0013] Preferably, the cover plate assembly further includes a second adhesive backing portion, which is bonded to the support ring on one side in the first direction and to the insulating ring on the other side in the first direction.
[0014] Preferably, the sum of the areas of the portions of the cover plate body that are in contact with the plurality of first adhesive portions is 1. The area of the portion of the cover plate body facing the mating part is , and satisfy: .
[0015] According to another aspect of this application, a battery cell is provided, the battery cell including the cover plate assembly described above.
[0016] The cover plate assembly of this application includes an explosion-proof valve, a cover plate body, a support frame, and an insulating sheet. The cover plate body has an installation port extending through it in a first direction, and the explosion-proof valve is disposed within the installation port. The support frame includes a support ring and multiple supports, each support protruding from the side of the support ring facing the cover plate body in the first direction. All supports are connected to the cover plate body. A plane perpendicular to the first direction is defined as a projection plane, and the projection of the explosion-proof valve along the first direction onto this projection plane is located inside the projection of the support ring along the first direction onto this projection plane. The insulating sheet includes a bonding portion and an insulating ring. The bonding portion is bonded to the side of the cover plate body facing the support ring, and the insulating ring covers the side of the support ring facing away from the cover plate body. The bonding portion provides insulation between the electrode assembly and the cover plate body, and the insulating ring provides insulation between the electrode assembly and the support frame. In the event of thermal runaway of the battery cell, the support frame supports the electrode assembly, and high-temperature gas can flow through the flow port enclosed by the support ring to the explosion-proof valve, and then be discharged through the explosion-proof valve. In this way, in the event of thermal runaway, the support frame can support the electrode group, preventing the electrode group from blocking the explosion-proof valve, ensuring the venting effect of the explosion-proof valve, and improving the safety performance of the battery cell. Attached Figure Description
[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0018] Figure 1 A three-dimensional structural schematic diagram of the cover plate assembly is shown; Figure 2 The diagram shows the relative positions of the cover plate body and the support frame from one perspective. Figure 3 A three-dimensional structural schematic diagram of the cover plate body is shown; Figure 4 A schematic diagram of the planar structure of the cover plate body is shown; Figure 5 A three-dimensional structural diagram of the support frame is shown; Figure 6 A schematic diagram of the planar structure of the support frame is shown; Figure 7 A three-dimensional structural schematic diagram of the insulating component is shown from one perspective; Figure 8 A three-dimensional structural schematic diagram of the insulating component from another perspective; Figure 9 A three-dimensional structural diagram of the battery cell is shown.
[0019] Reference numerals: 1-Explosion-proof valve; 2-Cover plate body; 21-Groove; 3-Support frame; 31-Support ring; 32-Support; 33-Flow port; 34-Exhaust channel; 4-Insulating sheet; 41-Adhesive part; 42-Insulating ring; 43-Connector; 431-Exhaust port; 5-First adhesive part; 6-Second adhesive part; 7-Housing shell; 8-Top cover; F1-First direction; F2-Second direction; F3-Third direction. Detailed Implementation
[0020] The following detailed embodiments are provided to help the reader gain a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will be apparent after understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein; changes that will be apparent after understanding the disclosure of this application are possible, except for operations that must occur in a specific order. Furthermore, for clarity and brevity, descriptions of features known in the art may be omitted.
[0021] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many feasible ways of implementing the methods, apparatus, and / or systems described herein that will be apparent upon understanding the disclosure of this application.
[0022] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, it may be directly "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, or there may be one or more other elements in between. In contrast, when an element is described as being "directly on" another element, "directly connected to" another element, "directly bonded to" another element, "directly on" another element, or "directly covering" another element, there may be no other elements in between.
[0023] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.
[0024] Although terms such as “first,” “second,” and “third” may be used herein to describe individual components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts are not limited by these terms. Rather, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Therefore, without departing from the teachings of the examples described herein, the first component, assembly, region, layer, or part referred to as the second component, assembly, region, layer, or part may also be referred to as the second component, assembly, region, layer, or part.
[0025] For ease of description, spatial relation terms such as “above,” “upper,” “below,” and “lower” are used herein to describe the relationship between one element and another, as shown in the accompanying drawings. Such spatial relation terms are intended to include not only the orientation depicted in the drawings but also different orientations of the device during use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “upper” relative to another element will subsequently be “below” or “lower” relative to that other element. Therefore, the term “above” includes both “above” and “below” orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relation terms used herein will be interpreted accordingly.
[0026] The terminology used herein is for the purpose of describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms “comprising,” “including,” and “having” enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.
[0027] Variations in the shapes shown in the accompanying drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the accompanying drawings, but include changes in shape that may occur during manufacturing.
[0028] The features of the examples described herein can be combined in various ways that will be apparent upon understanding the disclosure of this application. Furthermore, although the examples described herein have a wide variety of constructions, other constructions are possible, as will be apparent upon understanding the disclosure of this application.
[0029] The following will combine Figures 1 to 9 The cover plate assembly and the battery cell are described in detail. Figures 1 to 9 In the middle, the first direction F1 is perpendicular to the second direction F2, and the third direction F3 is perpendicular to the plane determined by the second direction F2 and the first direction F1.
[0030] According to one aspect of this application, a cover plate assembly is provided, such as... Figures 1 to 8 As shown, the cover assembly includes an explosion-proof valve 1, a cover body 2, a support frame 3, and an insulating sheet 4. The cover body 2 has an installation port extending through it along a first direction F1, and the explosion-proof valve 1 is installed in the installation port. The support frame 3 includes a support ring 31 and multiple supports 32. Each support 32 protrudes from the support ring 31 on the side facing the cover body 2 along the first direction F1, and all supports 32 are connected to the cover body 2. The plane perpendicular to the first direction F1 is defined as the projection plane, and the projection of the explosion-proof valve 1 along the first direction F1 onto the projection plane is located inside the projection of the support ring 31 along the first direction F1 onto the projection plane. The insulating sheet 4 includes a bonding portion 41 and an insulating ring 42. The bonding portion 41 is bonded to the side of the cover body 2 facing the support ring 31, and the insulating ring 42 covers the side of the support ring 31 facing away from the cover body 2. The bonding portion 41 provides insulation between the electrode assembly and the cover body 2, and the insulating ring 42 provides insulation between the electrode assembly and the support frame 3. In the event of thermal runaway in the battery cell, the support frame 3 supports the electrode assembly, allowing high-temperature gas to flow through the flow port 33 enclosed by the support ring 31 to the explosion-proof valve 1, and then be discharged through the explosion-proof valve 1. Thus, in the event of thermal runaway, the support frame 3 can support the electrode assembly, preventing the electrode assembly from blocking the explosion-proof valve 1, ensuring the venting effect of the explosion-proof valve 1, and improving the safety performance of the battery cell.
[0031] Optionally, such as Figure 4 and Figure 6 As shown, the distance between the surface of the support ring 31 facing the cover plate body 2 in the first direction F1 and the cover plate body 2 is... , satisfy: The dimension of the support ring 31 in the first direction F1 is... , satisfy: The distance between the surface of the support ring 31 facing away from the cover plate body 2 in the first direction F1 and the cover plate body 2 is... , .
[0032] In the embodiments of this application, such as Figure 2 , Figure 3 and Figure 5As shown, the cover plate body 2 has multiple grooves 21. The grooves 21 are recessed into the interior of the cover plate body 2 from the side facing the support ring 31, and are arranged around the explosion-proof valve 1. Each groove 21 corresponds to a support 32. A portion of the support 32 is inserted into the corresponding groove 21, so that the support ring 31 and the cover plate body 2 are spaced apart. The support 32 is bonded to the groove wall of the corresponding groove 21 via an adhesive portion. Thus, the grooves 21 limit the position of the support 32, and the adhesive portion secures the support 32 to the groove wall of the groove 21, improving the stability of the support 32 and ensuring the stability of the support frame 3 during installation.
[0033] Furthermore, the outer wall of the support 32 comprises four parts surrounding the support 32. The distance between each part and the groove 21 and the opposite groove wall of that part is greater than or equal to 0.05 mm and less than or equal to 0.1 mm. This limits the gap between the support 32 and the groove wall of the groove 21, ensuring that the adhesive portion formed after the glue is poured into the groove 21 can stably bond the support 32 and the groove wall of the groove 21, thereby improving the stability of the support frame 3 during installation.
[0034] Optionally, the number of supports 32 can be two, three, four or more, and the cover plate body 2 has a groove 21 at the corresponding position of each support 32. Preferably, the number of supports 32 is four.
[0035] Preferably, the effective opening area of the explosion-proof valve 1 is The plane perpendicular to the first direction F1 is defined as the projection plane, and the area of the outer contour of the support ring 31 projected onto the projection plane along the first direction F1 is... , and satisfy: .exist At that time, the outer contour area of the support ring 31 projected onto the projection plane along the first direction F1 is... The area of contact between the support ring 31 and the electrode assembly is relatively small, resulting in poor support effect of the support frame 3 on the electrode assembly. At that time, the outer contour area of the support ring 31 projected onto the projection plane along the first direction F1 is... The support ring 31 is relatively large, requiring more material, and the support frame 3 has a higher cost. At the same time, it can take into account both the support effect of the support frame 3 on the pole group and the cost of the support frame 3.
[0036] In addition, the contact area between the support 32 and the adhesive part is , and satisfy: .exist At that time, the contact area between the support 32 and the adhesive part The support is relatively small, resulting in poor bonding stability of the support 32, and the support frame 3 is prone to detachment under tension. At that time, the contact area between the support 32 and the adhesive part The groove 21 requires a relatively large amount of glue, resulting in higher costs. At the same time, it can balance the stability of the support frame 3 installation and the manufacturing cost.
[0037] like Figure 7 and Figure 8 As shown, the insulating sheet 4 also includes a connector 43. One end of the connector 43 in the first direction F1 is connected to the fitting part 41, and the other end of the connector 43 in the first direction F1 is connected to the insulating ring 42. The connector 43 has an exhaust port 431. An exhaust channel 34 is formed between adjacent supports 32. In the event of thermal runaway, high-temperature gas can also flow to the explosion-proof valve 1 through the exhaust port 431 and the exhaust channel 34, and then be discharged through the explosion-proof valve 1. At the same time, the integral contour design of the insulating sheet 4, the support frame 3, and the cover plate body 2 ensures the insulation effect on the support frame 3 and the cover plate body 2.
[0038] In addition, each exhaust channel 34 is provided with a corresponding exhaust port 431, with the exhaust channel 34 directly opposite the exhaust port 431. This improves the exhaust efficiency during thermal runaway and enhances the safety performance of the battery cell.
[0039] Preferably, the insulating sheet 4 can be made of PP (Polypropylene), and the tensile strength of the insulating sheet 4 is greater than 50 MPa, the elastic modulus is greater than 1100 MPa, and the elongation is greater than 85%. The wall thickness of the insulating sheet 4 is... , ,satisfy .
[0040] like Figure 7 As shown, the cover assembly also includes multiple first adhesive backing portions 5. One side of the first adhesive backing portion 5 in the first direction F1 is bonded to the cover body 2, and the other side of the first adhesive backing portion 5 in the first direction F1 is bonded to the bonding portion 41. The multiple first adhesive backing portions 5 are arranged at intervals. In this way, by providing the first adhesive backing portions 5, the connection between the bonding portion 41 and the cover body 2 can be achieved, so as to ensure the stability of the installation of the bonding portion 41.
[0041] Optionally, the first adhesive portion 5 is divided into two groups, and the two groups of first adhesive portions 5 are respectively bonded to the two parts of the bonding portion 41 located on both sides of the explosion-proof valve 1 in the second direction F2, so as to ensure that both parts of the bonding portion 41 located on both sides of the explosion-proof valve 1 in the second direction F2 are connected to the cover plate body 2. The number of first adhesive portions 5 in each group can be one, two or more, preferably, each group includes only one first adhesive portion 5.
[0042] In addition, the cover plate assembly also includes a second adhesive backing 6, which is bonded to the support ring 31 on one side in the first direction F1, and to the insulating ring 42 on the other side in the first direction F1. Thus, by providing the second adhesive backing 6, the connection between the insulating ring 42 and the support frame 3 can be achieved, ensuring the stability of the insulating ring 42 installation.
[0043] Optionally, the number of second adhesive portions 6 can be one, two, or more. When there is only one second adhesive portion 6, it can be designed to conform to the shape of the support ring 31; when there are multiple second adhesive portions 6, they are arranged at intervals.
[0044] Optionally, the connector 43 and the insulating ring 42 enclose a space for accommodating the support frame 3, the dimension of which in the first direction F1 is [missing information]. , and satisfy: .
[0045] Preferably, the sum of the areas of the portions of the cover plate body 2 that are in contact with the plurality of first adhesive portions 5 is The area of the portion of the cover plate body 2 facing the mating part 41 is , and satisfy: .exist At that time, the area of the first adhesive backing 5 was relatively small, and the insulating sheet 4 was at risk of detaching. At that time, the area of the first adhesive part 5 was relatively large, requiring a larger area and thus incurring higher costs. At the same time, it can balance cost and the stability of the bonding of the insulating sheet 4.
[0046] Optionally, the first adhesive part 5 and the second adhesive part 6 are made of insulating adhesive with good temperature resistance, electrolyte resistance and stability. The temperature resistance range of the insulating adhesive is -40℃ to 85℃. The insulating adhesive is tested according to GB / T2792-2014 standard and has a 180° peel force greater than 35N. It is tested according to ASTM D3654 standard and has a holding force of more than 60 hours without falling off. It is tested according to GB / T31125-2014 standard and has an initial tack greater than 25N.
[0047] Select rated discharge energy for Rated charging power for Rated voltage for Nine groups of battery cells underwent thermal runaway performance testing. Each group contained 10 cells with identical parameters. Different groups of cells exhibited different thermal runaway performance. , , , and The values are shown in the table below.
[0048] Test environment: The battery cell under test is placed in the thermal runaway test apparatus. A sheet-like heating element is arranged on the largest surface area of the battery cell. The size of the sheet-like heating element is no larger than the area of the largest surface area of the battery cell, and the power of the heating element needs to be greater than [missing information]. (For example, the power of the heating element can be) ); Test equipment: A temperature sensor with a diameter of less than 1 mm is placed at the center of the other surface with the largest area in the battery cell. The temperature sampling period is set to 1 second, and the test is set to continuously detect three temperature rise rate values that are greater than or equal to... Alternatively, fire or explosion can be used as the criteria for determining thermal runaway. The test cell is then connected to the charging and discharging device and its voltage data sampling line. Experimental method: Perform constant current charging, start heating, and record time, voltage, current, temperature, and rate of temperature rise. Record experimental phenomena, including expansion, leakage, smoke, fire, explosion, shell rupture, and rupture location; trigger the judgment condition for thermal runaway or when the temperature reaches... Or the test time reaches When the time is up, stop the power supply and heating, observe for 1 hour, and record the time, voltage, current, temperature, temperature rise rate, and test phenomena, including expansion, leakage, smoke, fire, explosion, shell cracking, crack location, and electrode group movement.
[0049] The test results for the 9 groups of battery cells are as follows:
[0050] Based on the table above, it can be seen that... At that time, the area of the first adhesive backing portion 5 was relatively small, leading to the problem of the insulating sheet 4 detaching during the cover plate assembly manufacturing process. , ,and At that time, the bonding strength of the insulating sheet 4 met the requirements, the process of the cover plate assembly was normal, the explosion-proof valve 1 could open normally when the cell experienced thermal runaway, the support frame 3 could support the electrode group, the electrode group did not show obvious signs of movement, the cell venting met the requirements, and the support frame 3 was not deformed and its strength met the requirements.
[0051] According to another aspect of this application, a battery cell is provided, which includes the same technical effects as the aforementioned cover plate assembly, and will not be repeated here.
[0052] like Figure 9 As shown, the battery cell also includes an electrode assembly, a housing 7, and a top cover 8. The electrode assembly is disposed inside the housing 7, and the top cover 8 and the cover plate assembly are respectively welded to the two ends of the housing 7 in the first direction F1.
[0053] Preferably, the first direction F1 is parallel to the length direction of the battery cell, the second direction F2 is parallel to the width direction of the battery cell, and the third direction F3 is parallel to the thickness direction of the battery cell.
[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.
Claims
1. A cover plate assembly, characterized in that, The cover plate assembly includes an explosion-proof valve, a cover plate body, a support frame, and an insulating sheet. The cover plate body has an installation port that extends through the cover plate body in a first direction, and the explosion-proof valve is disposed in the installation port. The support frame includes a support ring and multiple supports. The supports protrude from the side of the support ring facing the cover plate body in the first direction. All of the multiple supports are connected to the cover plate body. The plane perpendicular to the first direction is defined as the projection plane. The projection of the explosion-proof valve on the projection plane along the first direction is located inside the projection of the support ring on the projection plane along the first direction. The insulating sheet includes an adhesive portion and an insulating ring. The adhesive portion is attached to the side of the cover plate body facing the support ring, and the insulating ring covers the side of the support ring facing away from the cover plate body.
2. The cover plate assembly according to claim 1, characterized in that, The cover plate body has multiple grooves, which are recessed into the interior of the cover plate body from the side facing the support ring. Each groove corresponds to a support, and a portion of the support is inserted into the corresponding groove so that the support ring and the cover plate body are arranged at intervals. The support is bonded to the groove wall of the corresponding groove through an adhesive part.
3. The cover plate assembly according to claim 2, characterized in that, The insulating sheet further includes a connector, one end of which is connected to the mating portion in the first direction, and the other end of which is connected to the insulating ring in the first direction. The connector has an exhaust port.
4. The cover plate assembly according to claim 3, characterized in that, Multiple supports are arranged around the explosion-proof valve, and an exhaust channel is formed between two adjacent supports. Each exhaust channel is provided with an exhaust port, and the exhaust channel is directly opposite the exhaust port corresponding to the exhaust channel.
5. The cover plate assembly according to any one of claims 2-4, characterized in that, The effective opening area of the explosion-proof valve is The plane perpendicular to the first direction is defined as the projection plane, and the area of the outer contour of the support ring projected onto the projection plane along the first direction is... , and satisfy: .
6. The cover plate assembly according to claim 5, characterized in that, The contact area between the support and the adhesive portion is: , and satisfy: .
7. The cover plate assembly according to any one of claims 2-4, characterized in that, The cover plate assembly further includes a plurality of first adhesive backing portions, which are bonded to the cover plate body on one side in the first direction and to the bonding portion on the other side in the first direction, with the plurality of first adhesive backing portions arranged at intervals.
8. The cover plate assembly according to claim 7, characterized in that, The cover plate assembly further includes a second adhesive backing portion, which is bonded to the support ring on one side in the first direction and to the insulating ring on the other side in the first direction.
9. The cover plate assembly according to claim 7, characterized in that, The sum of the areas of the portions where the cover plate body is in contact with the plurality of the first adhesive portions is The area of the portion of the cover plate body facing the mating part is , and satisfy: .
10. A battery cell, characterized in that, The battery cell includes the cover plate assembly according to any one of claims 1 to 9.