Cover plate, cover plate assembly and battery

Abstract

This application relates to the field of battery technology, and in particular to a cover plate, a cover plate assembly, and a battery. The cover plate has an explosion-proof valve mounting hole extending through its inner and outer sides along its thickness direction, and the explosion-proof valve mounting hole is used to install an explosion-proof valve. An exhaust groove is formed on the inner side of the cover plate near the electrode core, and the exhaust groove is connected to the explosion-proof valve mounting hole. The exhaust groove is used to conduct gas generated inside the battery to the explosion-proof valve, and the explosion-proof valve releases the gas to the outside of the battery. This application provides a novel cover plate with an exhaust groove, which allows for venting during thermal runaway. It is evident that, based on the existing plastic venting, a new venting channel is added, greatly improving the venting effect during thermal runaway. Especially when the venting structure on the plastic is blocked by internal battery components or substances, the exhaust groove on the cover plate can still vent normally, further enhancing the venting effect.

Description

Technical Field

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

[0002] When a battery experiences thermal runaway, various gases are released internally, causing a sudden increase in internal pressure. This triggers a safety valve on the cover to release the gases, preventing accidents and ensuring the battery's safety and reliability during use. However, current venting structures primarily utilize a lower plastic layer beneath the cover, often with venting channels. These channels are often limited and ineffective, especially when internal components or substances block them, hindering rapid venting and compromising safety and reliability. Utility Model Content

[0003] The purpose of this application is to provide a cover plate, a cover plate assembly, and a battery, which to a certain extent solves the technical problems existing in the prior art where, when the battery experiences thermal runaway, it relies solely on the venting channel on the lower plastic under the cover plate for venting. This venting channel is singular and has poor venting effect. In particular, when internal structural components or substances of the battery block the venting channel on the lower plastic, it will lead to the inability to vent quickly, thus failing to guarantee safety and reliability.

[0004] This application provides a cover plate having an explosion-proof valve mounting through hole extending through its inner and outer sides along its thickness direction, the explosion-proof valve mounting through hole being used to install an explosion-proof valve; an exhaust groove is formed on the inner side of the cover plate near the electrode core, one end of the exhaust groove being located near the explosion-proof valve mounting through hole and maintaining a preset distance between them, or one end of the exhaust groove being connected to the explosion-proof valve mounting through hole, the exhaust groove being used to conduct gas generated inside the battery to the explosion-proof valve, and the explosion-proof valve depressurizes and discharges the gas to the outside of the battery.

[0005] In the above technical solution, the end of the exhaust channel away from the explosion-proof valve is located near the edge of the cover plate, and a preset distance is maintained between the two.

[0006] In any of the above technical solutions, the end of the exhaust groove furthest from the explosion-proof valve extends through the edge of the cover plate.

[0007] In any of the above technical solutions, further, along the length direction of the cover plate, at least one side of the explosion-proof valve mounting through hole is provided with the exhaust groove, and the exhaust groove extends along the length direction of the cover plate.

[0008] In any of the above technical solutions, further, along the length direction of the cover plate, there are multiple exhaust grooves on at least one side of the explosion-proof valve mounting through hole, and the multiple exhaust grooves are arranged sequentially at intervals along the width direction of the cover plate.

[0009] In any of the above technical solutions, the cover plate further comprises a pole mounting through hole extending through its inner and outer sides along its thickness direction, the exhaust groove passing through the outer side of the pole mounting through hole, and the exhaust groove being V-shaped, with the opening of the V-shaped exhaust groove and the mating areas on both sides corresponding to the pole mounting through hole; the mating areas on both sides of the V-shaped exhaust groove having a smooth transition.

[0010] In any of the above technical solutions, further, along the width direction of the cover plate, at least one side of the explosion-proof valve mounting through hole is provided with the exhaust groove, and the exhaust groove extends along the width direction of the cover plate.

[0011] In any of the above technical solutions, further, along the width direction of the cover plate, at least one side of the explosion-proof valve mounting through hole is provided with a plurality of exhaust grooves, and the plurality of exhaust grooves are arranged sequentially at intervals along the length direction of the cover plate.

[0012] In any of the above technical solutions, the minimum distance between the end of the exhaust groove near the explosion-proof valve mounting hole and the side wall of the explosion-proof valve mounting hole is L, and 0.5mm≤L≤1mm.

[0013] In any of the above technical solutions, the exhaust grooves are further provided on at least two opposite sides of the explosion-proof valve mounting hole.

[0014] In any of the above technical solutions, the cross-section of the exhaust groove perpendicular to its length direction is an arc-shaped groove.

[0015] In any of the above technical solutions, the cover plate further includes a sealing portion and a mating portion connected to each other, and the mating portion is disposed on the inner side of the sealing portion near the electrode core, and the projection of the mating portion along the thickness direction of the cover plate completely falls into the projection of the sealing portion along the thickness direction of the cover plate, and a gap is formed between the two projections; the exhaust groove is formed on the inner side of the mating portion near the electrode core.

[0016] This application also provides a cover plate assembly, including an insulating member, an explosion-proof valve, and the cover plate described in any of the above-mentioned technical solutions. The explosion-proof valve is installed within an explosion-proof valve mounting through hole in the cover plate. The insulating member is installed on the inner side of the cover plate near the electrode core, and a portion of the projection of the exhaust groove along the thickness direction of the cover plate lies within the projection of the insulating member along the thickness direction of the cover plate, while the other portion of its projection lies outside the projection of the insulating member along the thickness direction of the cover plate. Therefore, it possesses all the beneficial technical effects of this cover plate, which will not be elaborated further here.

[0017] In the above technical solution, further, along the length direction of the insulating member, at least one end of the insulating member is provided with a limiting protrusion protruding toward the pole core side, and the limiting protrusion forms a cavity with an opening facing the cover plate side, and along the thickness direction of the insulating member, the bottom wall of the cavity near the pole core side is formed with an auxiliary through hole; the projection of the exhaust groove along the thickness direction of the insulating member passes through the projection of the cavity along the thickness direction of the insulating member.

[0018] This application also provides a battery, including a casing, an electrode core, and a cover plate assembly as described in any of the above technical solutions. The electrode core is installed inside the casing, the cover plate assembly is installed at the open end of the casing, and an exhaust channel is formed between the sidewall of the insulating member and the sidewall of the casing, and the exhaust channel communicates with an exhaust groove on the cover plate. Therefore, it possesses all the beneficial technical effects of this cover plate, which will not be elaborated further here.

[0019] Compared with the prior art, the beneficial effects of this application are as follows: This application provides a novel cover plate with venting grooves, which allow for venting during thermal runaway. This adds a new venting channel to the existing plastic venting system, significantly improving the venting effect during thermal runaway. Especially when the venting structure on the plastic is blocked by internal battery components or substances, the venting grooves on the cover plate can still vent, further enhancing the venting effect. Furthermore, one end of the venting groove is positioned close to the explosion-proof valve mounting hole, maintaining a preset distance between them. This means the venting groove is not connected to the explosion-proof valve mounting hole. The advantage of this structure is that it does not affect the welding between the explosion-proof valve and the cover plate, ensuring the sealing of the weld and preventing electrolyte leakage. Attached Figure Description To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of the cover plate provided in an embodiment of this application; Figure 2 This is another structural schematic diagram of the cover plate provided in an embodiment of this application; Figure 3 This is a schematic diagram of the structure of the cover plate assembly provided in an embodiment of this application; Figure 4 for Figure 3 A partially enlarged structural diagram; Figure 5 for Figure 4 A magnified structural diagram at point A; Figure 6 This is another structural schematic diagram of the cover plate assembly provided in an embodiment of this application; Figure 7 Another structural schematic diagram of the cover plate assembly provided in the embodiments of this application; Figure 8 for Figure 7 A partially enlarged structural diagram.

[0021] Figure label: 1-Cover plate, 11-Explosion-proof valve mounting through hole, 12-Exhaust groove, 13-Pole mounting through hole, 14-Sealing part, 15-Matching part, 2-Insulating component, 21-Limiting protrusion, 211-Auxiliary through hole, 3-Explosion-proof valve, 4-Pole, 5-Exhaust channel. Detailed Implementation

[0022] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.

[0023] The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application.

[0024] Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used 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. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" 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 based on the specific circumstances.

[0027] The following reference Figures 1 to 8 This application describes a cover plate, cover plate assembly, and battery according to some embodiments thereof.

[0028] Example 1 See Figures 1 to 6 As shown, an embodiment of this application provides a cover plate 1. The cover plate 1 has an explosion-proof valve mounting through hole 11 extending through its inner and outer sides along its thickness direction, and the explosion-proof valve mounting through hole 11 is used to install an explosion-proof valve 3. An exhaust groove 12 is formed on the inner side of the cover plate 1 near the electrode core, and one end of the exhaust groove 12 is set close to the explosion-proof valve mounting through hole 11 and the two are kept at a preset distance. The exhaust groove 12 is used to conduct the gas generated inside the battery to the explosion-proof valve 3, and the explosion-proof valve 3 depressurizes and discharges the gas to the outside of the battery.

[0029] As can be seen from the structure described above, this application provides a novel cover plate 1 with an exhaust groove 12 on it. This allows for venting during thermal runaway. It is evident that, in addition to utilizing the lower plastic venting system, a new exhaust channel 5 is added, significantly improving the venting effect during thermal runaway. Especially when the venting structure on the lower plastic is blocked by internal battery components or substances, the exhaust groove 12 on the cover plate 1 can still vent normally, further enhancing the venting effect. Furthermore, one end of the exhaust groove 12 is positioned close to the explosion-proof valve mounting hole 11, maintaining a preset distance between them. This means that the exhaust groove 12 is not connected to the explosion-proof valve mounting hole 11. The advantage of this structure is that it does not affect the welding of the explosion-proof valve 3 and the cover plate 1, ensuring the sealing of the weld and preventing electrolyte leakage.

[0030] It should be noted that: it is not limited to setting one end of the exhaust groove 12 close to the explosion-proof valve mounting hole 11 and maintaining a preset distance between them; other structures can also be used. For example, one end of the exhaust groove 12 can be connected to the explosion-proof valve mounting hole 11.

[0031] In this embodiment, preferably, as follows: Figures 1 to 5 , Figure 7 and Figure 8 As shown, the end of the vent groove 12 furthest from the explosion-proof valve 3 is positioned close to the edge of the cover plate 1, and a preset distance is maintained between them. This is mainly because the vent channel 5 formed by the insulating member 2 (i.e., the lower plastic) and the housing, as described below, is positioned close to the inner edge of the cover plate 1. Therefore, extending one end of the vent groove 12 all the way to the edge of the cover plate 1 allows for venting using the vent channel 5 and the vent groove 12 on the cover plate 1. Of course, this is not the only option. The end of the vent groove 12 furthest from the explosion-proof valve 3 can also be positioned away from the edge of the cover plate 1. Especially when the insulating member 2 (i.e., the lower plastic) forms a vent groove with a vent hole, it is only necessary to ensure that a portion of the structure of the vent groove 12 projected along the thickness direction of the cover plate 1 is located within the projection of the vent groove along the thickness direction of the cover plate 1. It is not necessary for one end of the vent groove 12 on the cover plate 1 to extend close to the edge of the cover plate 1.

[0032] In this embodiment, preferably, as follows: Figures 1 to 5 , Figure 7 and Figure 8 As shown, the end of the exhaust duct 12 furthest from the explosion-proof valve 3 extends through the edge of the cover plate 1. As can be seen from the structure described above, by having the exhaust groove 12 pass through the edge of the cover plate 1, the exhaust groove 12 can be connected to the exhaust channel 5 formed between the insulating member 2 described below, that is, the side wall of the lower plastic and the side wall of the shell, which is also the exhaust channel 5 set on the inner edge of the cover plate 1, thereby realizing exhaust. Moreover, this structure is easier to process and manufacture, which helps to improve production efficiency.

[0033] It should be noted that the end of the exhaust groove 12 away from the explosion-proof valve 3 may not penetrate the edge of the cover plate 1, as long as the exhaust groove 12 is connected to the exhaust channel 5.

[0034] In this embodiment, preferably, as follows: Figure 1 and Figure 2 As shown, along the length of the cover plate 1, at least one side of the explosion-proof valve mounting through hole 11 is provided with an exhaust groove 12, and the exhaust groove 12 extends along the length of the cover plate 1, so that the gas in the exhaust channel 5 located on the side along the length of the cover plate 1 can be discharged to meet the usage requirements.

[0035] Furthermore, preferably, the aforementioned exhaust grooves 12 are provided on both opposite sides of the explosion-proof valve mounting through hole 11 for installing the explosion-proof valve 3 along the length direction of the cover plate 1, and the exhaust groove 12 on each side extends along the length direction of the cover plate 1. This allows for the simultaneous removal of gas from the exhaust channels 5 on both sides, improving the exhaust effect. It should be noted that this is not the only option; an exhaust groove 12 may also be provided on only one side of the explosion-proof valve mounting through hole 11, depending on actual needs.

[0036] Furthermore, preferably, along the length of the cover plate 1, there are multiple exhaust grooves 12 on both sides of the explosion-proof valve mounting through hole 11, and the multiple exhaust grooves 12 on each side are arranged sequentially at intervals along the width of the cover plate 1. This increases the area of ​​the exhaust region, which helps to ensure uniform exhaust. Of course, this is not the only limitation; only one exhaust groove 12 can be provided on each side of the explosion-proof valve mounting through hole 11, depending on actual needs. In this embodiment, preferably, as follows: Figure 1 and Figure 2 As shown, the cover plate 1 has a pole mounting through hole 13 extending through its inner and outer sides along its thickness direction. This pole mounting through hole 13 is used to install the pole 4. The exhaust groove 12 passes through the outer side of the pole mounting through hole 13 and maintains a preset distance from the pole mounting through hole 13. The exhaust groove 12 is V-shaped, and the opening of the V-shaped exhaust groove 12 and the docking area on both sides of it are set corresponding to the pole mounting through hole 13. As can be seen from the structure described above, the exhaust groove 12 is set in a V-shape to avoid the through hole 13 for the electrode post mounting, thus achieving the purpose of avoidance. Of course, it is not limited to this; the exhaust groove 12 can also be set in a curved shape to avoid the through hole 13 for the electrode post mounting.

[0037] Furthermore, preferably, the mating areas on both sides of the V-shaped exhaust groove 12 are smoothly transitioned, which helps with exhaust, but of course, it is not limited to this.

[0038] In this embodiment, preferably, as follows: Figure 2 As shown, the minimum distance between the end of the exhaust groove 12 near the explosion-proof valve mounting hole 11 and the side wall of the explosion-proof valve mounting hole 11 is L, and 0.5mm≤L≤1mm. This ensures that the exhaust groove 12 is as close as possible to the explosion-proof valve mounting hole 11, while also ensuring that there is a certain gap between the exhaust groove 12 and the side wall of the explosion-proof valve mounting hole 11. In other words, it ensures the exhaust effect without affecting the welding of the explosion-proof valve 3 and the cover plate 1. Of course, it is not limited to this; L<0.5mm or L>5mm can also be made.

[0039] In this embodiment, preferably, as follows: Figure 1 and Figure 2As shown, the cross-section of the exhaust groove 12 perpendicular to its length direction is an arc-shaped groove, which will not produce sharp corners, facilitates the smooth exhaust, and is convenient for processing and manufacturing. Of course, it is not limited to this. The cross-section of the exhaust groove 12 perpendicular to its length direction can also be a groove of other shapes, such as a square groove, etc., depending on the actual needs.

[0040] In this embodiment, preferably, as follows: Figure 4 As shown, the cover plate 1 includes a sealing portion 14 and a mating portion 15 connected to each other. The mating portion 15 is disposed on the inner side of the sealing portion 14 near the electrode core. The projection of the mating portion 15 along the thickness direction of the cover plate 1 falls completely into the projection of the sealing portion 14 along the thickness direction of the cover plate 1, and a gap is formed between the two projections. The exhaust groove 12 is formed on the inner side of the mating portion 15 near the electrode core.

[0041] As can be seen from the structure described above, the mating part 15 is inserted into the opening of the shell and mates with the side wall of the shell, while the cover part 14 is located outside the shell and completely blocks the opening of the shell, thereby achieving the sealing of the shell. Since the mating part 15 is located inside the shell, an exhaust groove 12 is provided on the mating part 15 to achieve exhaust in case of thermal runaway.

[0042] Of course, the structure of cover 1 is not limited to this; cover 1 may also include only the sealing part 14, etc. The specific choice depends on the actual needs.

[0043] It should be noted that, not limited to this embodiment, exhaust grooves 12 are provided on opposite sides of the explosion-proof valve mounting through hole 11 along the length direction of the cover plate 1. The distribution of the exhaust grooves 12 can also be selected according to actual needs. That is, the exhaust grooves 12 are provided on at least opposite sides of the explosion-proof valve mounting through hole 11. For example: Example 1: The exhaust groove 12 can also be provided on at least one side of the explosion-proof valve mounting through hole 11 along the width direction of the cover plate 1, and the exhaust groove 12 extends along the width direction of the cover plate 1. In this way, the sidewall of the insulating member 2 along its width direction can be aligned with the corresponding sidewall of the housing. The exhaust channels 5 formed between the side walls allow gas to escape, which also helps improve the exhaust effect. Preferably, each side of the aforementioned explosion-proof valve mounting hole 11 has multiple exhaust grooves 12, and the multiple exhaust grooves 12 are arranged sequentially and spaced apart along the length direction of the cover plate 1, which helps to ensure uniform exhaust. Example 2: At least one side of the cover plate 1 along its length direction and at least one side of the cover plate 1 along its width direction are provided with the aforementioned exhaust grooves 12. Example 3: All sides of the cover plate 1 are provided with exhaust grooves 12, that is, exhaust grooves 12 are provided along the entire outer perimeter of the cover plate 1. Of course, it is not limited to the above three examples, and can be designed according to actual needs.

[0044] Example 2 See Figures 3 to 6 As shown, Embodiment 2 of this application also provides a cover plate assembly, including the cover plate 1 described in Embodiment 1 above. Therefore, it has all the beneficial technical effects of the cover plate 1. The same technical features and beneficial effects will not be repeated here.

[0045] In this embodiment, preferably, as follows: Figures 3 to 6 As shown, the cover plate assembly also includes an insulating member 2 and an explosion-proof valve 3; wherein, the explosion-proof valve 3 is installed in the explosion-proof valve mounting through hole 11 of the cover plate 1; the insulating member 2 is installed on the inner side of the cover plate 1 near the pole core, and along the thickness direction of the cover plate 1, a portion of the projection of the exhaust groove 12 along the thickness direction of the cover plate 1 is located within the projection of the insulating member 2 along the thickness direction of the cover plate 1, and another portion of its projection is located outside the projection of the insulating member 2 along the thickness direction of the cover plate 1, that is, the other portion of its projection is located outside the projection of the insulating member 2 and close to the side of the housing. As can be seen from the structure described above, the exhaust groove 12 on the cover plate 1 extends to the outside of the insulating member 2, so that the insulating member 2, for example, the plastic, will not block the exhaust groove 12, thereby allowing the exhaust groove 12 to connect with the aforementioned side exhaust channel 5, thus achieving the function of rapid exhaust. In this embodiment, preferably, as follows: Figure 3 and Figure 4 As shown, along the length direction of the insulating member 2, at least one end of the insulating member 2 is provided with a limiting protrusion 21 protruding toward the pole core side, and the limiting protrusion 21 forms a cavity with an opening facing the cover plate 1 side, and along the thickness direction of the insulating member 2, the bottom wall of the cavity near the pole core side is formed with an auxiliary through hole 211; the projection of the exhaust groove 12 along the thickness direction of the insulating member 2 passes through the projection of the cavity along the thickness direction of the insulating member 2.

[0046] Example 3 Embodiment 2 of this application also provides a battery including the cover assembly described in Embodiment 1 above, and thus has all the beneficial technical effects of the cover assembly. The same technical features and beneficial effects will not be repeated here.

[0047] In this embodiment, preferably, as follows: Figures 1 to 8 As shown, the battery also includes a casing and an electrode core (not shown in the figure); wherein, the electrode core is installed inside the casing, the cover plate assembly is installed at the open end of the casing, and an exhaust channel 5 is formed between the side wall of the insulating member 2 and the side wall of the casing, and the exhaust channel 5 is connected to the exhaust groove 12 on the cover plate 1. As can be seen from the structure described above, the gas generated during thermal runaway of the electrode core can be discharged into the exhaust groove 12 through the aforementioned exhaust channel 5, and then guided to the explosion-proof valve 3 by the exhaust groove 12, and discharged to the outside of the battery by the explosion-proof valve 3, making the battery safer and more reliable during use.

[0048] It should be noted that: Figure 8 The dashed line in the figure shows the location of the side wall of the housing, and an exhaust channel 5 is formed between the side wall of the housing and the side wall of the insulating member 2.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application 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 therein. Such 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 this application.

Claims

1. A cover plate, characterized in that, The cover plate has an explosion-proof valve mounting hole extending through its inner and outer sides along its thickness direction, and the explosion-proof valve mounting hole is used to install an explosion-proof valve; an exhaust groove is formed on the inner side of the cover plate near the electrode core, and one end of the exhaust groove is located close to the explosion-proof valve mounting hole and the two are maintained at a preset distance, or one end of the exhaust groove is connected to the explosion-proof valve mounting hole. The exhaust groove is used to conduct the gas generated inside the battery to the explosion-proof valve, and the explosion-proof valve releases the gas to the outside of the battery.

2. The cover plate according to claim 1, characterized in that, The end of the venting channel away from the explosion-proof valve is located near the edge of the cover plate, and the two are kept at a preset distance.

3. The cover plate according to claim 2, characterized in that, The end of the vent groove furthest from the explosion-proof valve extends through the edge of the cover plate.

4. The cover plate according to claim 1, characterized in that, Along the length of the cover plate, at least one side of the explosion-proof valve mounting hole is provided with the exhaust groove, and the exhaust groove extends along the length of the cover plate.

5. The cover plate according to claim 4, characterized in that, Along the length of the cover plate, there are multiple exhaust grooves on at least one side of the explosion-proof valve mounting hole, and the multiple exhaust grooves are arranged sequentially at intervals along the width of the cover plate.

6. The cover plate according to claim 4, characterized in that, The cover plate has a pole mounting through hole extending through its inner and outer sides along its thickness direction. The exhaust groove passes through the outer side of the pole mounting through hole and is V-shaped. The opening of the V-shaped exhaust groove and the mating areas on both sides of the exhaust groove are provided corresponding to the pole mounting through hole. The mating areas on both sides of the V-shaped exhaust groove have a smooth transition.

7. The cover plate according to claim 1, characterized in that, Along the width direction of the cover plate, at least one side of the explosion-proof valve mounting through hole is provided with the vent groove, and the vent groove extends along the width direction of the cover plate.

8. The cover plate according to claim 7, characterized in that, Along the width direction of the cover plate, at least one side of the explosion-proof valve mounting through hole is provided with a plurality of exhaust grooves, and the plurality of exhaust grooves are arranged sequentially at intervals along the length direction of the cover plate.

9. The cover plate according to any one of claims 1 to 8, characterized in that, The minimum distance between the end of the exhaust channel near the explosion-proof valve mounting hole and the sidewall of the explosion-proof valve mounting hole is L, and 0.5mm≤L≤1mm; and / or The explosion-proof valve mounting hole has at least two opposite sides provided with the vent grooves; and / or The cross-section of the exhaust channel perpendicular to its length is an arc-shaped channel; and / or The cover plate includes a sealing portion and a mating portion connected together. The mating portion is disposed on the inner side of the sealing portion near the electrode core. The projection of the mating portion along the thickness direction of the cover plate falls completely into the projection of the sealing portion along the thickness direction of the cover plate, and a gap is formed between the two projections. The exhaust groove is formed on the inner side of the mating portion near the electrode core.

10. A cover plate assembly, characterized in that, The device includes an insulating component, an explosion-proof valve, and a cover plate as described in any one of claims 1 to 9; wherein the explosion-proof valve is installed in an explosion-proof valve mounting through hole in the cover plate; the insulating component is installed on the inner side of the cover plate near the electrode core, and a portion of the projection of the exhaust groove along the thickness direction of the cover plate is located within the projection of the insulating component along the thickness direction of the cover plate, while another portion of its projection is located outside the projection of the insulating component along the thickness direction of the cover plate.

11. The cover plate assembly according to claim 10, characterized in that, Along the length of the insulating member, at least one end of the insulating member is provided with a limiting protrusion protruding toward the pole core side, and the limiting protrusion forms a cavity with an opening facing the cover plate side, and along the thickness direction of the insulating member, the bottom wall of the cavity near the pole core side is formed with an auxiliary through hole; the projection of the exhaust groove along the thickness direction of the insulating member passes through the projection of the cavity along the thickness direction of the insulating member.

12. A battery, characterized in that, The device includes a housing, an electrode core, and a cover plate assembly as described in claim 10 or 11; wherein the electrode core is installed inside the housing, the cover plate assembly is installed at the open end of the housing, and an exhaust channel is formed between the sidewall of the insulating member and the sidewall of the housing, and the exhaust channel is connected to an exhaust groove on the cover plate.

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