Cover plate assembly, battery and electric device

Abstract

The utility model discloses a kind of cover plate assembly, battery and electric equipment, the cover plate assembly includes: cover plate and power-off piece, the side of the cover plate along thickness direction is adapted to towards current collector plate;The power-off piece is located in the side of the cover plate towards the current collector plate, the power-off piece includes first connecting part, weak part and second connecting part, the first connecting part and the second connecting part are connected by the weak part;The first connecting part is connected with the cover plate, the second connecting part is spaced apart from the cover plate along the thickness direction of the cover plate and is adapted to be connected with the current collector plate, the weak part is adapted to break under first setting condition to disconnect the first connecting part and the second connecting part. Thus, cover plate can be disconnected with current collector plate when battery occurs thermal runaway to realize the power-off of battery, can reduce the risk of battery fire explosion, improves the safety performance of battery.

Description

Technical Field

[0001] This utility model relates to battery technology, and in particular to a cover plate assembly, a battery, and an electrical device. Background Technology

[0002] When a battery experiences thermal runaway due to abnormalities such as compression or puncture, causing its internal pressure to rise continuously, it can catch fire and explode if the positive and negative terminals cannot be immediately disconnected. In related technologies, cylindrical batteries typically have a fuse structure on the current collector to disconnect the current collector and achieve power loss. However, the fuse structure often increases the battery's internal resistance, affects overcurrent, increases the heat generated by the battery pack, and is detrimental to the thermal management of the battery pack. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a cover plate assembly that can disconnect from the current collector in the event of thermal runaway of the battery, thereby cutting off the battery's power supply, reducing the risk of battery fire and explosion, and improving battery safety performance.

[0004] A cover plate assembly according to an embodiment of the present invention includes: a cover plate, one side of which is adapted to face the collector plate along its thickness direction; a power-off component, the power-off component being disposed on the side of the cover plate facing the collector plate, the power-off component including a first connecting portion, a weak portion, and a second connecting portion, the first connecting portion and the second connecting portion being connected through the weak portion; the first connecting portion being connected to the cover plate, the second connecting portion being spaced apart from the cover plate along the thickness direction of the cover plate and adapted to be connected to the collector plate, the weak portion being adapted to break under a first predetermined condition to disconnect the first connecting portion and the second connecting portion.

[0005] According to the embodiment of the present utility model, the cover plate assembly can be broken under a first set condition by setting a weak part to disconnect the first connecting part and the second connecting part, so that the cover plate can disconnect from the current collector when the battery experiences thermal runaway, thereby realizing the power cut-off of the battery, reducing the risk of battery fire and explosion, and improving the safety performance of the battery.

[0006] According to some embodiments of the present invention, in a cover plate assembly, the first connecting portion is disposed around the second connecting portion and is connected to the outer edge of the second connecting portion through the weak portion.

[0007] According to some embodiments of the present invention, the cover plate assembly has a liquid injection hole in the middle of the power-off component, the cover plate has a through hole extending along its own thickness direction, the through hole is at least partially opposite to the liquid injection hole along the axial direction, and the cover plate assembly further includes a liquid injection plug for sealing the liquid injection hole.

[0008] According to some embodiments of the present invention, the cover plate assembly has a ring-shaped power-off component, and a limiting flange is provided on the inner side of the power-off component. The limiting flange protrudes toward the side away from the cover plate, and the limiting flange defines the injection hole.

[0009] According to some embodiments of the present invention, the cover plate assembly further includes: a sealing plate, which is connected to the cover plate and is used to block the through hole.

[0010] According to some embodiments of the present invention, the cover plate assembly has a mounting groove surrounding the through hole on the side of the cover plate away from the power-off component, and the sealing plate is disposed in the mounting groove and welded to the cover plate.

[0011] According to some embodiments of the present invention, the cover plate assembly has a groove in the weak portion, which is adapted to disconnect the first connecting portion and the second connecting portion at the groove.

[0012] According to some embodiments of the present invention, the cover plate assembly has a first connecting portion having a first connecting section adapted to fit against the side wall of the cover plate and welded to the cover plate; and / or, the second connecting portion having a second connecting section adapted to fit against the side wall of the collector plate and welded to the collector plate.

[0013] According to some embodiments of the present invention, in the cover plate assembly, one side of the first connecting portion is connected to the cover plate, and the other side of the first connecting portion extends obliquely toward the collector plate and is connected to the second connecting portion.

[0014] According to some embodiments of the present invention, the cover plate assembly has an exhaust hole, and the cover plate assembly further includes an explosion-proof valve adapted to cover the exhaust hole, the explosion-proof valve being configured to open the exhaust hole when a second preset condition is met.

[0015] According to some embodiments of the present invention, a cover plate assembly is provided in which a closed space is formed between the cover plate and the power-off component, and the vent is provided in the area of ​​the cover plate that defines the closed space.

[0016] According to some embodiments of the present invention, the cover plate assembly has a limiting protrusion on the side of the cover plate facing the enclosed space. The limiting protrusion is disposed opposite to the first connecting portion. When the connection between the first connecting portion and the second connecting portion is broken at the weak portion, the limiting protrusion is used to stop against the first connecting portion.

[0017] According to some embodiments of the present invention, the cover plate assembly has multiple limiting protrusions, and at least some of the limiting protrusions are spaced apart around the exhaust hole.

[0018] This utility model also proposes a battery.

[0019] The battery according to an embodiment of the present invention includes the cover plate assembly according to any of the above embodiments.

[0020] This utility model also proposes an electrical device.

[0021] The electrical equipment according to the embodiments of the present invention includes the battery described in any of the above embodiments.

[0022] The battery, the electrical equipment, and the cover plate assembly have the same advantages as the prior art, and will not be described further in this utility model.

[0023] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0024] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of a cover plate assembly according to an embodiment of the present utility model; Figure 2 This is a schematic diagram of the cover plate assembly according to an embodiment of the present utility model after the first connecting part and the second connecting part are disconnected; Figure 3 This is a schematic diagram of the installation of the cover plate and the power-off component according to an embodiment of the present utility model; Figure 4 This is a schematic diagram of a cover plate assembly according to another embodiment of the present invention; Figure 5 yes Figure 4 The diagram shows the cover plate assembly after the first and second connecting parts are disconnected. Figure 6 yes Figure 4 The diagram shows the installation of the cover plate and the power-off component.

[0025] Figure label: Battery 1000; Cover plate assembly 100; Cover plate 1; Through hole 11; Mounting groove 12; Vent hole 13; Limiting protrusion 14; Power-off component 2; First connecting part 21; First connecting section 211; Second connecting part 22; Second connecting section 221; Weak part 23; Injection hole 24; Limiting flange 25; 3. Injection plug; 4. Sealing plate; 5. Explosion-proof valve; 6. Enclosed space; Housing 200; Cell housing 201; Cell 300; Current collector 400. Detailed Implementation

[0026] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0027] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model 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 of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more. In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] Hereinafter, with reference to the accompanying drawings, a cover plate assembly 100 according to an embodiment of the present invention will be described.

[0029] like Figures 1-6As shown, the cover plate assembly 100 according to an embodiment of the present utility model includes: a cover plate 1 and a power disconnecting component 2. One side of the cover plate 1 along the thickness direction is adapted to face the collector plate 400. The power disconnecting component 2 is disposed on the side of the cover plate 1 facing the collector plate 400. The power disconnecting component 2 includes a first connecting portion 21, a weak portion 23 and a second connecting portion 22. The first connecting portion 21 and the second connecting portion 22 are connected to each other through the weak portion 23. The first connecting portion 21 is connected to the cover plate 1. The second connecting portion 22 is spaced apart from the cover plate 1 along the thickness direction and is adapted to be connected to the collector plate 400. The weak portion 23 is adapted to break under a first set condition to disconnect the first connecting portion 21 and the second connecting portion 22.

[0030] First, such as Figures 1-3 As shown, the battery 1000 includes a housing 200, a battery cell 300, a current collector 400, and a cover assembly 100. The housing 200 has a battery cell receiving cavity 201, in which the battery cell 300 is disposed. The current collector 400 is also disposed within the battery cell receiving cavity 201 and is adapted to be electrically connected to the battery cell 300. The cover assembly 100 is located at the end of the housing 200. The cover assembly 100 includes a cover plate 1 and a power-off component 2. The cover plate 1 is connected to the housing 200, for example, by laser welding. The cover plate 1 seals the battery cell receiving cavity 201. One side of the cover plate 1 along its thickness direction is adapted to face the current collector 400. The power-off component 2 is located on the side of the cover plate 1 facing the current collector 400, i.e., on the side of the cover plate 1 facing the battery cell receiving cavity 201.

[0031] It should be noted that the cover plate 1 and the power disconnect component 2 can be made of aluminum alloy, and the housing 200 can be made of aluminum alloy or SPCC nickel plating.

[0032] The power-off component 2 includes a first connecting part 21, a weak part 23, and a second connecting part 22 connected together. The first connecting part 21 and the second connecting part 22 are connected through the weak part 23. The first connecting part 21 is connected to the cover plate 1. The second connecting part 22 is spaced apart from the cover plate 1 along the thickness direction of the cover plate 1. The second connecting part 22 is adapted to be connected to the current collector 400. A closed space 6 is formed between the cover plate 1 and the power-off component 2. The closed space 6 is separated from the cell housing cavity 201. When the pressure in the cell housing cavity 201 increases to form a pressure difference between the cell housing cavity 201 and the closed space 6, the pressure in the cell housing cavity 201 can directly act on the power-off component 2.

[0033] The weak part 23 is adapted to break under a first set condition to disconnect the first connection part 21 and the second connection part 22. It should be noted that the first set condition is that the pressure difference between the cell housing cavity 201 and the enclosed space 6 reaches the limit pressure value that the weak part 23 of the power-off component 2 can withstand. The limit pressure value that the weak part 23 can withstand can be selected according to design requirements.

[0034] Specifically, when the battery 1000 encounters abnormalities such as puncture or compression that lead to thermal runaway, if the first set condition is met, the weak part 23 of the power-off component 2 breaks to disconnect the first connection part 21 and the second connection part 22, the enclosed space 6 is connected to the cell housing cavity 201, the first connection part 21 is pressed against the side wall of the current collector 400 under pressure, the cover plate 1 and the current collector 400 are completely disconnected, and the battery 1000 is de-energized.

[0035] With the above settings, the power can be cut off when thermal runaway occurs in the battery 1000, reducing the risk of battery 1000 catching fire and exploding, improving the safety performance of battery 1000. Moreover, compared with the fuse structure on the current collector 400, the power-off component 2 has good conductivity, which can reduce the internal resistance of battery 1000, improve the overcurrent capacity of battery 1000, reduce heat generation, and facilitate the thermal management of battery 1000.

[0036] According to the embodiment of the present utility model, the cover plate assembly 100 can be broken under a first set condition by setting a weak part 23 to disconnect the first connecting part 21 and the second connecting part 22, so that the cover plate 1 can disconnect from the current collector 400 when the battery 1000 experiences thermal runaway, thereby realizing the power cut-off of the battery 1000. This can reduce the risk of the battery 1000 catching fire and exploding, improve the safety performance of the battery 1000, and the power cut-off component 2 has good conductivity, which can reduce the internal resistance of the battery 1000, reduce heat generation, and facilitate the thermal management of the battery 1000.

[0037] In some embodiments of this utility model, such as Figures 1-3 As shown, the second connecting part 22 is located in the middle region of the power-off component 2, and the first connecting part 21 is located in the edge region of the power-off component 2. The first connecting part 21 is arranged around the second connecting part 22 and is connected to the outer edge of the second connecting part 22 through the weak part 23. The first connecting part 21 is connected to the cover plate 1, and the second connecting part 22 is spaced apart from the cover plate 1 and connected to the collector plate 400.

[0038] With the above settings, the power-off component 2 can directly define the enclosed space 6 with the cover plate 1 without the need for additional sealing components, which simplifies the structure of the cover plate assembly 100 and helps reduce processing costs.

[0039] Of course, this utility model is not limited to this. Alternatively, the second connecting part 22 can be located at the edge of the power-off component 2, the first connecting part 21 can be located in the middle of the power-off component 2, the second connecting part 22 can be arranged around the first connecting part 21 and connected to the outer edge of the first connecting part 21 through the weak part 23, the first connecting part 21 can be connected to the cover plate 1, the second connecting part 22 can be spaced apart from the cover plate 1 and connected to the collector plate 400, and an annular insulating seal can be provided between the second connecting part 22 and the cover plate 1. The power-off component 2, the cover plate 1, and the insulating seal together define the enclosed space 6. This facilitates meeting different design requirements.

[0040] In some embodiments of this utility model, such as Figures 1-3 As shown, the power-off component 2 is provided with a liquid injection hole 24, and the cover plate 1 is provided with a through hole 11 extending along its own thickness direction. The through hole 11 is at least partially opposite to the liquid injection hole 24 along the axial direction. The diameter of the through hole 11 is greater than or equal to the diameter of the liquid injection hole 24. The cover plate assembly 100 also includes a liquid injection plug 3. The liquid injection plug 3 can be a thermoformed part. The material of the liquid injection plug 3 can be EPDM or fluororubber. The liquid injection plug 3 can be installed into the liquid injection hole 24 of the power-off component 2 through the through hole 11 to seal the liquid injection hole 24.

[0041] Specifically, firstly, the current collector 400 and the battery cell 300 are installed into the battery cell receiving cavity 201 of the housing 200, and the current collector 400 and the battery cell 300 are welded together; then, the first connecting part 21 of the power disconnecting component 2 is welded together with the cover plate 1 and assembled to the housing 200, the cover plate 1 is welded together with the housing 200, and the second connecting part 22 of the power disconnecting component 2 is welded together with the current collector 400; next, electrolyte is injected into the battery cell receiving cavity 201 through the injection hole 24, and after the injection is completed, the injection hole 24 is sealed through the injection plug 3; finally, the through hole 11 is sealed to complete the processing of the battery 1000.

[0042] The above settings can reduce the number of openings on the cover plate 1, which helps to simplify the structure, reduce costs, and allow the injection hole 24 to be located in the middle of the cover plate 1, which facilitates positioning during the injection process and improves the design rationality of the cover plate assembly 100.

[0043] In some embodiments of this utility model, such as Figures 1-3 As shown, the power-off component 2 is ring-shaped, and a limiting flange 25 is provided on the inner side of the power-off component 2. The limiting flange 25 protrudes from the side away from the cover plate 1, and the limiting flange 25 defines the injection hole 24. When the injection plug 3 blocks the injection hole 24, the limiting flange 25 can be used to seal with the injection plug 3. It should be emphasized that the ring shape here can be circular, square, or other shapes. This utility model does not limit the shape.

[0044] By adopting the above settings, the mating area between the liquid injection plug 3 and the power disconnect component 2 can be increased, so that the liquid injection plug 3 is not easy to detach from the power disconnect component 2, which is conducive to improving the sealing performance of the enclosed space 6, ensuring that the power disconnect component 2 can stably break when the first set condition is met, and improving the reliability of the cover plate assembly 100.

[0045] In some embodiments of this utility model, such as Figures 1-3 As shown, the cover plate assembly 100 of this embodiment further includes a sealing plate 4, which is connected to the cover plate 1 and used to seal the through hole 11. Specifically, the sealing plate 4 can be a stamped part, and the material of the sealing plate 4 can be aluminum alloy. The sealing plate 4 is welded to the cover plate 1. Thus, the injection hole 24 can be sealed twice, ensuring the overall sealing performance of the battery 1000 and improving the practicality of the cover plate assembly 100.

[0046] In some embodiments of this utility model, such as Figures 2-3 As shown, a mounting groove 12 can be provided on the side of the cover plate 1 away from the power disconnector 2. The mounting groove 12 is arranged around the through hole 11, and the sealing plate 4 is disposed in the mounting groove 12 and welded to the cover plate 1. This increases the mating area between the sealing plate 4 and the cover plate 1, which is beneficial to improving the installation performance of the sealing plate 4. It also keeps the side of the cover plate assembly 100 away from the battery cell 300 flat, thus improving the design rationality of the cover plate assembly 100.

[0047] In some embodiments of this utility model, the cover plate 1 can be a stamped part. This ensures the structural strength of the cover plate 1 and improves the reliability of the cover plate assembly 100.

[0048] In some embodiments of this invention, the power-off component 2 can be a stamped part. This ensures the structural strength of the power-off component 2 and improves the reliability of the cover plate assembly 100.

[0049] In some embodiments of this invention, the collector plate 400 can be configured as a stamped part. This ensures the structural strength of the collector plate 400 and improves the reliability of the cover plate assembly 100.

[0050] In some embodiments of this utility model, such as Figure 3 As shown, the weak portion 23 has a notch, which is suitable for disconnecting the first connecting portion 21 and the second connecting portion 22 at the notch. This allows for more precise control of the breakage location of the power-off component 2, improving its practicality. Furthermore, since the notch is easy to process, it reduces the molding difficulty of the power-off component 2 and improves its molding quality, ensuring that the power-off component 2 breaks promptly when the first preset condition is met, thus enhancing its reliability.

[0051] Of course, this invention is not limited to this; the thickness of the power-off component 2 can also be made thinner in certain areas to define the weak point 23. This is beneficial for meeting different working conditions.

[0052] In some embodiments of this utility model, such as Figure 1 As shown, the first connecting part 21 is provided with a first connecting section 211, which is adapted to fit against the side wall of the cover plate 1 facing the collector plate 400 and be welded to the cover plate 1, such as by laser welding. This ensures the connection stability between the first connecting part 21 and the cover plate 1, improving the reliability of the power-off component 2.

[0053] In some embodiments of this utility model, the second connecting part 22 is provided with a second connecting section 221, which is adapted to fit against the side wall of the collector plate 400 facing the cover plate 1 and be welded to the collector plate 400, such as by laser welding. This ensures the connection stability between the second connecting part 22 and the collector plate 400, improving the reliability of the power-off component 2.

[0054] In some embodiments of this utility model, such as Figure 1 As shown, one side of the first connecting part 21 is connected to the cover plate 1, and the other side of the first connecting part 21 extends obliquely towards the collector plate 400 and is connected to the second connecting part 22. This makes the structure of the first connecting part 21 smoother, which helps to improve the structural strength of the first connecting part 21, thereby ensuring that the power-off component 2 can stably break at the weak point 21, and improving the reliability of the power-off piece 2.

[0055] In some embodiments of this utility model, such as Figures 4-6 As shown, a vent 13 can be provided on the cover plate 1, and the vent 13 penetrates the cover plate 1 along the thickness direction of the cover plate 1. The cover plate assembly 100 also includes an explosion-proof valve 5, which is adapted to shield the vent 13. The explosion-proof valve 5 is configured to open the vent 13 when a second set condition is met. It should be noted that the second set condition is that the pressure difference between the cell housing cavity 201 and the external space reaches the vent pressure of the explosion-proof valve 5. The vent pressure of the explosion-proof valve 5 can be selected according to design requirements, as long as the arrival time of the second set condition is later than the arrival time of the first set condition.

[0056] Specifically, when the battery 1000 encounters abnormalities such as puncture or compression that lead to thermal runaway, if the first set condition is met, the power-off component 2 breaks at the weak part 23 to disconnect the first connection part 21 and the second connection part 22. The enclosed space 6 is connected to the cell housing cavity 201. Under pressure, the first connection part 21 adheres to the side wall of the current collector 400, and the cover plate 1 and the current collector 400 are completely disconnected, causing the battery 1000 to lose power. After the battery 1000 loses power, if the battery 1000 continues to experience thermal runaway and reaches the second set condition, the explosion-proof valve 5 can open the exhaust port 13, allowing the high-temperature and high-pressure gas in the cell housing cavity 201 to be discharged outward through the exhaust port 13, thereby reducing the internal pressure of the battery 1000.

[0057] The above settings achieve the technical effect of first cutting off power and then releasing pressure, effectively reducing the risk of battery 1000 catching fire and exploding, and improving the safety performance of battery 1000.

[0058] In some embodiments of this utility model, such as Figures 4-6 As shown, a closed space 6 is formed between the cover plate 1 and the power disconnector 2. The exhaust port 13 can be set in the area of ​​the cover plate 1 that defines the closed space 6 so that the exhaust port 13 communicates with the closed space 6.

[0059] With the above settings, the explosion-proof valve 5 can be completely isolated from the electrolyte, avoiding the risk of leakage caused by electrolyte corrosion of the explosion-proof valve 5. At the same time, it also improves the problem of the explosion-proof valve 5 bursting due to the impact of electrolyte and battery cell 300 on the explosion-proof valve 5 when the battery 1000 is dropped, thus improving the service life of the battery 1000.

[0060] In some embodiments of this utility model, such as Figures 4-6 As shown, a limiting protrusion 14 can be provided on the side of the cover plate 1 facing the enclosed space 6. The limiting protrusion 14 is block-shaped and protrudes towards the power disconnecting component 2. The limiting protrusion 14 is positioned opposite to the first connecting part 21. When the connection between the first connecting part 21 and the second connecting part 22 is broken at the weak part 23, the limiting protrusion 14 is used to abut against the first connecting part 21 to prevent the first connecting part 21 from completely adhering to the side wall of the cover plate 1. This defines an exhaust channel between the first connecting part 21 and the cover plate 1. The exhaust channel is used to connect the cell housing cavity 201 with the exhaust hole 13 so that the high-temperature and high-pressure gas in the cell housing cavity 201 can flow through the exhaust channel and the exhaust hole 13 to be discharged outside the battery 1000.

[0061] The above-mentioned configuration can prevent the first connecting part 21 from blocking the exhaust port 13, ensuring the reliability of the exhaust process and improving the practicality of the battery 1000.

[0062] In some embodiments of this utility model, multiple limiting protrusions 14 can be provided, with at least some of the limiting protrusions 14 spaced apart around the vent hole 13. Adjacent limiting protrusions 14 can define separate communication openings, which are used to connect the cell receiving cavity 201 with the venting channel. This ensures the stability of the connection between the venting channel and the cell receiving cavity 201, making the venting process of the battery 1000 more reliable and improving the safety of the battery 1000.

[0063] In other embodiments of this utility model, such as Figure 6 As shown, multiple limiting protrusions 14 can be set around the through hole 11 of the cover plate 1. This is beneficial for meeting different design requirements.

[0064] This utility model also proposes a battery 1000.

[0065] like Figures 1-6 As shown, the battery 1000 according to an embodiment of the present invention includes a cover assembly 100 according to any of the above embodiments. It should be noted that the battery 1000 can be a cylindrical battery 1000.

[0066] According to the embodiment of the present utility model, the battery 1000 can cut off power in the event of thermal runaway, thereby reducing the risk of battery 1000 catching fire and exploding, improving the safety performance of battery 1000, and the battery 1000 has low heat generation, which is beneficial for thermal management and improves the overall performance of battery 1000.

[0067] This utility model also proposes an electrical device.

[0068] The electrical equipment according to the embodiments of this utility model includes a battery 1000 according to any of the above embodiments. It should be noted that the electrical equipment can be a pure electric vehicle, a hybrid vehicle, a drone, an energy storage station, or other similar equipment.

[0069] According to the embodiments of the present invention, the battery 1000 of the electrical equipment can cut off power in the event of thermal runaway, thereby reducing the risk of battery 1000 catching fire and exploding, improving the safety performance of battery 1000, and the battery 1000 generates little heat, which is beneficial for thermal management, improving the overall performance of battery 1000 and enhancing the product competitiveness of the electrical equipment.

[0070] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0071] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A cover plate assembly (100), characterized in that, include: Cover plate (1), one side of the cover plate (1) along the thickness direction is adapted to face the manifold (400); Power-off component (2), the power-off component (2) is provided on the side of the cover plate (1) facing the collector plate (400), the power-off component (2) includes a first connecting part (21), a weak part (23) and a second connecting part (22), the first connecting part (21) and the second connecting part (22) are connected through the weak part (23); the first connecting part (21) is connected to the cover plate (1), the second connecting part (22) is spaced apart from the cover plate (1) along the thickness direction of the cover plate (1) and is adapted to be connected to the collector plate (400), the weak part (23) is adapted to break under a first set condition to disconnect the first connecting part (21) and the second connecting part (22).

2. The cover plate assembly (100) according to claim 1, characterized in that, The first connecting portion (21) is disposed around the second connecting portion (22) and is connected to the outer edge of the second connecting portion (22) through the weak portion (23).

3. The cover plate assembly (100) according to claim 1, characterized in that, The power-off component (2) is provided with an injection hole (24), and the cover plate (1) is provided with a through hole (11) extending along its own thickness direction. The through hole (11) is at least partially opposite to the injection hole (24) along the axial direction. The cover plate assembly (100) also includes an injection plug (3), which is used to block the injection hole (24).

4. The cover plate assembly (100) according to claim 3, characterized in that, The power-off component (2) is ring-shaped, and a limiting flange (25) is provided on the inner side of the power-off component (2). The limiting flange (25) protrudes out toward the side away from the cover plate (1), and the limiting flange (25) defines the injection hole (24).

5. The cover plate assembly (100) according to claim 3, characterized in that, Also includes: A sealing plate (4) is connected to the cover plate (1) and is used to block the through hole (11).

6. The cover plate assembly (100) according to claim 5, characterized in that, The cover plate (1) has an installation groove (12) on the side away from the power disconnector (2) surrounding the through hole (11), and the sealing plate (4) is located in the installation groove (12) and welded to the cover plate (1).

7. The cover plate assembly (100) according to claim 1, characterized in that, The weak portion (23) has a notch, and the weak portion (23) is adapted to disconnect the first connecting portion (21) and the second connecting portion (22) at the notch.

8. The cover plate assembly (100) according to claim 1, characterized in that, The first connecting part (21) is provided with a first connecting section (211), which is adapted to fit against the side wall of the cover plate (1) and welded to the cover plate (1); and / or, the second connecting part (22) is provided with a second connecting section (221), which is adapted to fit against the side wall of the collector plate (400) and welded to the collector plate (400).

9. The cover plate assembly (100) according to claim 1, characterized in that, One side of the first connecting part (21) is connected to the cover plate (1), and the other side of the first connecting part (21) extends obliquely toward the collector plate (400) and is connected to the second connecting part (22).

10. The cover plate assembly (100) according to any one of claims 1-9, characterized in that, The cover plate (1) is provided with an exhaust hole (13), and the cover plate assembly (100) further includes an explosion-proof valve (5), which is adapted to cover the exhaust hole (13) and is configured to open the exhaust hole (13) when a second set condition is met.

11. The cover plate assembly (100) according to claim 10, characterized in that, A closed space (6) is formed between the cover plate (1) and the power-off component (2), and the vent (13) is provided in the area of ​​the cover plate (1) that defines the closed space (6).

12. The cover plate assembly (100) according to claim 11, characterized in that, The cover plate (1) has a limiting protrusion (14) on the side facing the enclosed space (6). The limiting protrusion (14) is disposed opposite to the first connecting part (21). When the weak part (23) disconnects the connection between the first connecting part (21) and the second connecting part (22), the limiting protrusion (14) is used to stop against the first connecting part (21).

13. The cover plate assembly (100) according to claim 12, characterized in that, There are multiple limiting protrusions (14), and at least some of the limiting protrusions (14) are spaced apart around the exhaust hole (13).

14. A battery (1000), characterized in that, Includes the cover plate assembly (100) according to any one of claims 1-13.

15. An electrical appliance, characterized in that, Includes the battery (1000) according to claim 14.

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