Top cover assembly, battery, energy storage device and electric equipment

Abstract

The utility model discloses a top cover assembly, a battery, an energy storage device and electric equipment. The top cover assembly comprises a top cover, an anti-explosion valve and a deformation part. The top cover comprises a first face and a second face which are opposite, and the top cover is provided with an anti-explosion hole penetrating through the first face and the second face. The anti-explosion valve is installed on the top cover and used for sealing the anti-explosion hole. The deformation piece is installed on the top cover and at least partially arranged at the bottom of the anti-explosion valve. Under the condition that the temperature of the deformation part reaches a preset temperature threshold value, the deformation part is bent and deformed and triggers the anti-explosion valve to be opened, and / or under the condition that the gas pressure borne by the anti-explosion valve reaches a preset gas pressure threshold value, the anti-explosion valve is opened.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a top cover assembly, a battery, an energy storage device, and an electrical equipment. Background Art

[0002] Lithium batteries are currently widely used in fields such as mobile phones, computers, electric vehicles, energy storage, etc. People have increasing safety requirements for lithium-ion batteries. When a battery fails, a large amount of gas is generated inside the battery and the temperature continues to rise. If no safety device is provided, the battery will explode. The safety device commonly set in lithium batteries at present is an explosion-proof valve triggered by air pressure, that is, when the air pressure inside the battery exceeds the air pressure trigger critical point of the explosion-proof valve, the explosion-proof valve opens to release pressure, thereby preventing the battery from exploding.

[0003] However, there is a situation where the temperature inside the battery has risen sharply, but the air pressure has not reached the air pressure trigger critical point. Only having the air pressure trigger as the only trigger condition cannot solve the safety problem of the battery. Summary of the Invention

[0004] This application provides a top cover assembly, a battery, an energy storage device, and an electrical equipment.

[0005] In a first aspect, this application provides a top cover assembly. The top cover assembly includes a top cover, an explosion-proof valve, and a deformation member. The top cover includes a first surface and a second surface facing away from each other, and the top cover is provided with an explosion-proof hole penetrating through the first surface and the second surface. The explosion-proof valve is installed on the top cover and is used to close the explosion-proof hole. The deformation member is installed on the top cover and is at least partially disposed at the bottom of the explosion-proof valve. When the temperature of the deformation member reaches a predetermined temperature threshold, the deformation member bends and deforms to trigger the opening of the explosion-proof valve. When the gas pressure received by the explosion-proof valve reaches a predetermined air pressure threshold, the explosion-proof valve opens.

[0006] In some embodiments, the deformation member is a shape memory metal. When the temperature of the deformation member is less than the predetermined temperature threshold, the deformation member is in a first state, and the first acting force between the deformation member and the explosion-proof valve is less than the opening acting force required for the explosion-proof valve to open. When the temperature of the deformation member reaches the predetermined temperature threshold, the deformation member is in a second state of bending and deforming, and the second acting force between the deformation member and the explosion-proof valve is greater than the opening acting force.

[0007] In some embodiments, the deformation member includes a fixed portion and a deformation portion connected to each other. When the temperature of the deformation member reaches a predetermined temperature threshold, the deformation portion can bend and deform relative to the fixed portion. A limiting portion is provided on the top cover, and the limiting portion is used to limit the movement freedom of the fixed portion in at least one direction.

[0008] In some embodiments, the deformable member includes a connected fixed portion and a deformable portion. When the temperature of the deformable member reaches a predetermined temperature threshold, the deformable portion can be bent and deformed relative to the fixed portion. A limiting portion is provided on the first insulating member, and the limiting portion is used to limit the degree of freedom of movement of the fixed portion in at least one direction.

[0009] In some embodiments, the deformable member includes a connected fixed portion and a deformable portion. When the temperature of the deformable member reaches a predetermined temperature threshold, the deformable portion can be bent and deformed relative to the fixed portion. Limiting portions are provided on the top cover and the first insulating member, and the limiting portions are used to limit the degree of freedom of movement of the fixed portion in at least one direction.

[0010] In some embodiments, the limiting portion is a groove.

[0011] In some embodiments, the limiting portion is a protrusion.

[0012] In some embodiments, the limiting portion is a groove. The groove includes a first sub-groove and a second sub-groove. The first sub-groove and the second sub-groove are bent and connected. The fixed portion includes a first sub-portion and a second sub-portion. The first sub-portion and the second sub-portion are bent and connected, the first sub-portion is received in the first sub-groove, and the second sub-portion is received in the second sub-groove.

[0013] In some embodiments, there is one deformable member, and in the width direction of the top cover, the extending direction of the deformable portion is consistent with the center line of the explosion-proof valve.

[0014] In some embodiments, there are two deformable members, and the two deformable portions are symmetrically arranged about the length center line of the explosion-proof valve.

[0015] In some embodiments, there are multiple deformable members, and in the length direction of the top cover, the multiple deformable portions are equidistantly distributed on the same side of the explosion-proof hole.

[0016] In some embodiments, the explosion-proof valve includes a scored area and a non-scored area. The scored area is in the shape of an unclosed ring. The non-scored area is connected to the opposite ends of the scored area and encloses a closed ring. The thickness of the scored area is less than the thickness of the non-scored area. In the extending direction of the deformable portion, the free end of the deformable portion away from the fixed portion is closer to the scored area than the non-scored area.

[0017] In some embodiments, in the projection plane perpendicular to the thickness direction of the explosion-proof valve, the overlapping length of the deformable portion and the explosion-proof valve is at least more than half of the width of the explosion-proof valve.

[0018] In some embodiments, when the explosion-proof valve closes the explosion-proof hole, the deformation member contacts the explosion-proof valve, and the contact area between the deformation member and the explosion-proof valve is smaller than the area where the deformation member does not contact the explosion-proof valve.

[0019] In some embodiments, the top cover is provided with a through hole penetrating the first surface and the second surface. The top cover assembly further includes a first insulating member, a second insulating member, and an electrode terminal. The first insulating member is disposed on one side where the first surface of the top cover is located. The second insulating member is disposed on one side where the second surface of the top cover is located. The electrode terminal passes through the through hole and protrudes relative to both the first surface and the second surface. In the thickness direction of the top cover, the first insulating member is located between the electrode terminal and the top cover, and the second insulating member is located between the electrode terminal and the top cover.

[0020] In a second aspect, the present application provides a battery, which includes the top cover assembly, the housing, and the battery cell according to any one of the above embodiments. The housing is provided with an opening, and the top cover assembly is mounted on the housing and closes the opening. The battery cell is accommodated in the housing, and the tab on the battery cell is electrically connected to the electrode terminal of the top cover assembly.

[0021] In a third aspect, the present application provides an energy storage device, which includes the battery according to any one of the above embodiments.

[0022] In a fourth aspect, the present application provides an electrical device, which includes the energy storage device according to any one of the above embodiments.

[0023] In the top cover assembly, the battery, the energy storage device, and the electrical device provided by the present application, a deformation member is added at a position corresponding to the explosion-proof valve. When the air pressure inside the battery does not reach the critical air pressure capable of breaking through the explosion-proof valve, but the temperature inside the battery has risen sharply and reached the predetermined temperature threshold of the deformation member, the deformation member can be bent and deformed to trigger the opening of the explosion-proof valve, and the pressure relief inside the battery can also be realized, thereby avoiding safety problems such as battery explosion and fire, and improving the use safety of the battery.

[0024] The additional aspects and advantages of the present application will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and / or additional aspects and advantages of the present application will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, where:

[0026] Figure 1 is a perspective three-dimensional schematic diagram of a top cover assembly of a battery according to some embodiments of the present application;

[0027] Figure 2 is Figure 1 A perspective three-dimensional schematic diagram of another perspective of the middle top cover assembly;

[0028] Figure 3 A cross-sectional schematic diagram of a partial structure of a battery according to some embodiments of the present application;

[0029] Figure 4 A perspective three-dimensional schematic diagram of a deformation part of a top cover assembly according to some embodiments of the present application;

[0030] Figure 5 A perspective three-dimensional schematic diagram of a top cover of a top cover assembly according to some embodiments of the present application;

[0031] Figure 6 A perspective three-dimensional schematic diagram of a partial structure of a top cover assembly according to some embodiments of the present application;

[0032] Figure 7 A top view of a partial structure of a top cover assembly according to some embodiments of the present application;

[0033] Figure 8 A perspective three-dimensional schematic diagram of a top cover assembly of a battery according to some embodiments of the present application;

[0034] Figure 9 A perspective three-dimensional schematic diagram of a top cover assembly of a battery according to some embodiments of the present application;

[0035] Figure 10 A cross-sectional schematic diagram of a battery according to some embodiments of the present application;

[0036] Figure 11 An exploded schematic diagram of a battery according to some embodiments of the present application;

[0037] Figure 12 An exploded schematic diagram of an energy storage device according to some embodiments of the present application;

[0038] Figure 13 A structural schematic diagram of an electrical equipment according to some embodiments of the present application.

[0039] Description of main element numbers:

[0040] Electrical equipment 10000, energy storage device 3000, battery 1000, box body 2000, box cover 2001, box body 2003;

[0041] Top cover assembly 100, housing 300, opening 301, battery cell 500, tab 700;

[0042] Top cover 10, first surface 101, second surface 103, explosion-proof hole 11, limiting part 13, groove 131, first sub-groove 1311, second sub-groove 1313, through hole 15, explosion-proof valve 30, scoring area 31, non-scoring area 33, first insulating part 50, deformable part 70, fixing part 71, first sub-part 711, second sub-part 713, deformable part 73, free end 731, second insulating part 80, electrode terminal 90. Detailed implementation

[0043] In the description of the present application, some disclosed content has been correspondingly shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The content described by referring to the drawings below is exemplary and is only used to explain the present application and cannot be understood as a limitation to the present application.

[0044] In the description of the present application, many different contents or examples are disclosed to implement different structures of the present application. To simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present application.

[0045] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, the meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0046] In the description of the present application, it should be understood that the terms used to indicate the orientation or positional relationship (such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc.) are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and facilitating the understanding of the corresponding embodiments, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms used to indicate the orientation or positional relationship cannot be understood as a limitation to the present application.

[0047] In the description of the present application, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is less than that of the second feature.

[0048] In the description of the present application, it should be noted that, unless otherwise clearly specified or limited, the terms "mounted", "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection. It may be a mechanical connection or an electrical connection. It may be directly connected or indirectly connected through an intermediate medium, and may be the internal communication between two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0049] Please refer to Figure 1 , Figure 2 and Figure 3 , the present application provides a top cover assembly 100, and the top cover assembly 100 includes a top cover 10, an explosion-proof valve 30 and a deformation member 70. The top cover 10 includes a first surface 101 and a second surface 103 facing away from each other, and the top cover 10 is provided with an explosion-proof hole 11 penetrating through the first surface 101 and the second surface 103. The explosion-proof valve 30 is mounted on the top cover 10 and is used to close the explosion-proof hole 11. The deformation member 70 is mounted on the top cover 10 and is at least partially disposed at the bottom of the explosion-proof valve 30. When the temperature of the deformation member 70 reaches a predetermined temperature threshold, the deformation member 70 deforms and triggers the explosion-proof valve 30 to open.

[0050] Wherein, a rectangular coordinate system is established with the length, width and height (thickness) of the top cover assembly 100 as the three axes. In the embodiment of the present application, the first direction X is the length direction of the top cover assembly 100, the second direction Y is the width direction of the top cover assembly 100, and the third direction Z is the height direction (thickness direction) of the top cover assembly 100.

[0051] Specifically, the first surface 101 of the top cover 10 is the lower surface of the top cover 10, and the second surface 103 of the top cover 10 is the upper surface of the top cover 10. The material of the top cover 10 is a conductive material, including but not limited to aluminum, iron, copper, aluminum alloy or iron alloy, etc. The shape of the projection surface of the top cover 10 in the XY plane may be circular, elliptical, triangular, quadrilateral or other polygons, etc., and is not limited herein. In this embodiment, the shape of the projection surface of the top cover 10 is rectangular.

[0052] The explosion-proof hole 11 is provided on the top cover 10 and is a spatial structure for releasing gas when the internal pressure of the battery 1000 is too high. The shape of the projection surface of the explosion-proof hole 11 in the XY plane can be circular, elliptical, triangular, quadrilateral or other polygons, etc., which is not limited here. In this embodiment, the explosion-proof hole 11 is runway-shaped. The number of explosion-proof holes 11 can be one or multiple. In this application, there is one explosion-proof hole 11 and it is located at the center of the top cover 10.

[0053] The explosion-proof valve 30 is installed on the top cover 10, and the installation method can be detachable connection or non-detachable connection. In one example, the explosion-proof valve 30 and the top cover 10 can be combined by a detachable connection method. The detachable connection methods include but are not limited to snap connection or threaded connection, etc. In another example, the explosion-proof valve 30 and the top cover 10 can be combined by a non-detachable connection method. The non-detachable connection methods include but are not limited to bonding or welding, etc. The shape of the projection surface of the explosion-proof valve 30 in the XY plane can be circular, elliptical, triangular, quadrilateral or other polygons, etc., which is not limited here. In the XY plane, the projection surface of the explosion-proof valve 30 at least covers the projection surface of the explosion-proof hole 11 to close the explosion-proof hole 11. The number of explosion-proof valves 30 can be one or multiple. In this application, there is one explosion-proof valve 30. When the number of explosion-proof holes 11 is multiple, the number of explosion-proof valves 30 can be the same as or different from the number of explosion-proof holes 11. In one example, the number of explosion-proof valves 30 is the same as the number of explosion-proof holes 11, and the explosion-proof valves 30 and the explosion-proof holes 11 are in one-to-one correspondence. In another example, the number of explosion-proof valves 30 is different from the number of explosion-proof holes 11, and one explosion-proof valve 30 can close at least two explosion-proof holes 11. When the explosion-proof valve 30 is subjected to a force, it will be lifted or punctured. At this time, the explosion-proof valve 30 no longer closes the explosion-proof hole 11, and the internal and external air of the battery 1000 ( Figure 11 as shown) is communicated, which can prevent the battery 1000 from exploding when the internal air pressure is too high and / or in a thermal runaway state, causing safety problems. The force can be the air pressure of the gas inside the battery 1000 rushing towards the explosion-proof valve 30, or the pressure generated by an actual object contacting and squeezing the explosion-proof valve 30, or other forms of forces. Among them, when the internal air pressure of the battery 1000 exceeds a predetermined air pressure threshold, the air pressure exerts pressure on the explosion-proof valve 30 to open the explosion-proof valve 30. This method in this application is called the air pressure trigger method.

[0054] The first insulating member 50 is disposed on the side where the first surface 101 of the top cover 10 is located. The first insulating member 50 is a component for preventing direct contact between the positive and negative electrodes inside the battery 1000 and short circuit. The first insulating member 50 is disposed on the first surface 101 of the top cover 10. The first insulating member 50 and the first surface 101 of the top cover 10 may be detachably connected or non-detachably connected. In one example, the first insulating member 50 and the first surface 101 of the top cover 10 may be combined by a detachable connection method, and the detachable connection methods include but are not limited to snap connection or screw connection, etc. In another example, the first insulating member 50 and the first surface 101 of the top cover 10 may be combined by a non-detachable connection method, and the non-detachable connection methods include but are not limited to bonding or welding, etc. The material of the first insulating member 50 is an insulating material, including but not limited to polypropylene, polyethylene, polycarbonate, polyimide, or polyvinyl chloride, etc. The shape of the projection surface of the first insulating member 50 in the XY plane may be circular, elliptical, triangular, quadrilateral, or other polygons, etc., which is not limited herein. In this embodiment, the shape of the projection surface of the first insulating member 50 is a rectangle that matches the top cover 10, and the edge of the first insulating member 50 is located inside the projection surface of the top cover 10, that is, the edge of the first insulating member 50 does not coincide with the edge of the top cover 10 in the XY plane.

[0055] The deformation member 70 is a component that can be bent and deformed at a predetermined temperature threshold, and can be used to apply a force to the explosion-proof valve 30 to open the explosion-proof valve 30. The deformation member 70 can be installed on the top cover 10, or on the first insulating member 50, or can be installed on both the top cover 10 and the first insulating member 50 at the same time. The installation method can be a detachable connection or a non-detachable connection. The detachable connection methods include but are not limited to snap connection or screw connection, etc., and the non-detachable connection methods include but are not limited to bonding or welding, etc. In this application, the installation method of the deformation member 70 is not limited. The number of the deformation members 70 can be one or multiple. One explosion-proof valve 30 can be correspondingly provided with one deformation member 70 or multiple deformation members 70. In the XY plane, at least a part of the projection surface of the deformation member 70 is located inside the projection surface of the explosion-proof valve 30, so that the deformation member 70 bends and deforms when the temperature rises sharply and is higher than the predetermined temperature threshold of the deformation member 70, and the bent and deformed deformation member 70 can apply a force to the explosion-proof valve 30 to open the explosion-proof valve 30. The deformation member 70 bends and deforms when reaching the predetermined temperature threshold and presses on the explosion-proof valve 30 to open the explosion-proof valve 30. In this application, it is called the temperature trigger method.

[0056] In this application, a deformation member 70 is added at a position corresponding to the explosion-proof valve 30. When the air pressure inside the battery 1000 has not reached the critical air pressure capable of breaking through the explosion-proof valve 30, but the internal temperature of the battery 1000 has risen sharply and reached the predetermined temperature threshold of the deformation member 70, the deformation member 70 can be bent and deformed to trigger the opening of the explosion-proof valve 30, and the pressure relief inside the battery 1000 can also be achieved, thereby avoiding safety problems such as explosion and fire of the battery 1000 and improving the usage safety of the battery 1000.

[0057] Please refer to Figure 4 and Figure 9 , in some embodiments, the deformation member 70 is a shape memory metal. When the temperature of the deformation member 70 is less than the predetermined temperature threshold, the deformation member 70 is in a first state. As shown in FIG. (a) in Figure 4 , the first acting force between the deformation member 70 and the explosion-proof valve 30 is less than the opening acting force required for the explosion-proof valve 30 to open. When the temperature of the deformation member 70 reaches the predetermined temperature threshold, the deformation member 70 is in a second state of being bent and deformed. As shown in FIG. (b) in Figure 4 , the second acting force between the deformation member 70 and the explosion-proof valve 30 is greater than the opening acting force.

[0058] Specifically, the material of the deformation member 70 can be a shape memory metal. A shape memory metal is a metal material that deforms when the temperature is greater than the predetermined temperature threshold and can return to its original shape when the temperature is less than the predetermined temperature threshold. The deformation member 70 can be a nickel-titanium alloy, a copper-based shape memory alloy, an iron-based shape memory alloy, etc., or other memory metal materials, which are not limited in this application. The deformation member 70 can be deformed as a whole or partially, which is not limited in this application. The predetermined temperature threshold is that when the deformation member 70 is formed, the deformation member 70 is in different first and second states when the temperature is less than and greater than the predetermined temperature threshold respectively through a process.

[0059] In this application, let the first acting force between the deformation member 70 and the explosion-proof valve 30 in the first state be F1, let the second acting force between the deformation member 70 and the explosion-proof valve 30 in the second state be F2, and the opening acting force be Ft. The deformation member 70 in the first state may or may not be in contact with the explosion-proof valve 30. When the deformation member 70 in the first state is in contact with the explosion-proof valve 30, the deformation member 70 may or may not exert an acting force on the explosion-proof valve 30. When the deformation member 70 in the first state is not in contact with the explosion-proof valve 30, the deformation member 70 may or may not exert an acting force on the explosion-proof valve 30. The situation of non-contact but with an acting force includes, but is not limited to, the acting force between the deformation member 70 and the explosion-proof valve 30 being magnetic force, etc. When the deformation member 70 in the first state exerts an acting force on the explosion-proof valve 30, at this time, the first acting force F1 and the opening acting force Ft satisfy: F1 < Ft. At this time, the deformation member 70 in the first state cannot open the explosion-proof valve 30. The bending degree of the deformation member 70 in the second state is greater than that of the deformation member 70 in the first state. At this time, the first acting force F1, the opening acting force Ft, and the second acting force F2 satisfy: F1 < Ft < F2. At this time, the second acting force F2 between the deformation member 70 and the explosion-proof valve 30 is greater than the opening acting force Ft, and the deformation member 70 can open the explosion-proof valve 30. At this time, the explosion-proof valve 30 no longer closes the explosion-proof hole 11, and the inside and outside of the battery 1000 are in air communication.

[0060] The deformation member 70 in the first state is not bent or has a bending degree less than that in the second state, which is convenient for the deformation member 70 to be installed on the top cover 10 and / or the first insulating member 50, and saves the space corresponding to the explosion-proof valve 30 corresponding to part of the deformation member 70. The deformation member 70 in the second state can exert a second acting force on the explosion-proof valve 30 through bending deformation, and the second acting force is greater than the opening acting force required for the explosion-proof valve 30 to open, so that the deformation member 70 can open the explosion-proof valve 30 when the temperature threshold is reached, avoiding the explosion of the battery 1000 during thermal runaway and causing safety problems.

[0061] Please refer to Figure 1 and Figure 8 , in some embodiments, when the gas pressure received by the explosion-proof valve 30 reaches a predetermined air pressure threshold, the explosion-proof valve 30 opens.

[0062] As described above, the explosion-proof valve 30 can also be opened by a gas pressure trigger method. At this time, the gas pressure inside the battery 1000 is greater than or equal to the predetermined air pressure threshold. The temperature inside the battery 1000 may reach the predetermined temperature threshold or may not reach the predetermined temperature threshold. At this time, the gas pressure inside the battery 1000 can directly push open the explosion-proof valve 30.

[0063] The explosion-proof valve 30 of the present application can be opened not only by a temperature-triggered method but also by a pressure-triggered method. The dual-trigger mode allows the explosion-proof valve 30 to have both temperature-triggered and pressure-triggered methods. It can not only open the explosion-proof valve 30 by pressure triggering when the internal pressure of the battery 100 exceeds a predetermined pressure threshold, but also, when the temperature rises sharply and is higher than the predetermined temperature threshold of the deformation member 70 while the pressure does not reach the predetermined pressure threshold, apply an opening force to the explosion-proof valve 30 through the bending deformation of the deformation member 70 when the temperature is higher than the predetermined temperature threshold, trigger and open the explosion-proof valve 30 by temperature, avoid the safety problem of battery 1000 explosion, and improve the safety performance of the battery 1000.

[0064] Please refer to Figure 4 and Figure 5 , in some embodiments, the deformation member 70 includes a connected fixing portion 71 and a deformation portion 73. When the temperature of the deformation member 70 reaches the predetermined temperature threshold, the deformation portion 73 can bend and deform relative to the fixing portion 71. A limiting portion 13 is provided on the top cover 10, and the limiting portion 13 is used to limit the movement freedom of the fixing portion 71 in at least one direction.

[0065] Specifically, the fixing portion 71 is the part of the deformation member 70 disposed in the limiting portion 13, and the deformation portion 73 is the part of the deformation member 70 that is not disposed in the limiting portion 13 and is located at the corresponding position of the explosion-proof valve 30. Being located at the corresponding position of the explosion-proof valve 30 means that in the XY projection plane, the projection plane of the deformation portion 73 is located within the projection plane of the explosion-proof valve 30. The cross-section of the deformation member 70 intercepted by the XY plane can be in an L shape (as shown in Figure 4 ), bar shape, triangular shape, pentagonal shape or other regular or irregular shapes, and the cross-section of the deformation member 70 intercepted by the XZ plane can be in a rectangular shape (as shown in Figure 4 ), circular shape, triangular shape, pentagonal shape or even other polygons. The fixing portion 71 and the deformation portion 73 can be integrally formed or separately formed. When separately formed, the fixing portion 71 and the deformation portion 73 can be detachably connected or non-detachably connected. The detachable connection methods include but are not limited to snap connection or screw connection, etc., and the non-detachable connection methods include but are not limited to bonding or welding, etc. The materials of the fixing portion 71 and the deformation portion 73 can be the same or different. When the materials are different, the materials of the fixing portion 71 and the deformation portion 73 can be partially different or completely different. It should be noted that in the fixing portion 71 and the deformation portion 73, at least part of the deformation portion 73 can bend and deform and trigger the opening of the explosion-proof valve 30 when the temperature reaches the predetermined temperature threshold. In the present application, the fixing portion 71 and the deformation portion 73 are integrally formed and have the same material.

[0066] The cross-section of the fixing part 71 and the deformation part 73 intercepted by the XY plane can be circular, elliptical, triangular, quadrilateral, or other polygons and their combinations, etc., which are not limited herein. The cross-sectional shapes of the fixing part 71 and the deformation part 73 intercepted by the XY plane can be the same or different. In the present application, the cross-sectional shapes of the fixing part 71 and the deformation part 73 intercepted by the XY plane are different. The cross-section of the fixing part 71 intercepted by the XY plane is a combination of two adjacent rectangles and is in an L shape as a whole. The cross-section of the deformation part 73 intercepted by the XY plane is rectangular.

[0067] The limiting part 13 is a component for restricting the degrees of freedom of movement of the fixing part 71. The fixing part 71 has a total of six degrees of freedom of movement in six directions: movement along the first direction X, movement along the second direction Y, movement along the third direction Z, rotation around the first direction X, rotation around the second direction Y, and rotation around the third direction Z. The limiting part 13 restricts at least one degree of freedom of movement. In addition, the limiting part 13 can further play a role in fixing the fixing part 71. The limiting part 13 and the fixing part 71 can be detachably connected or non-detachably connected. In one example, the limiting part 13 and the fixing part 71 can be combined together by a detachable connection method, and the detachable connection methods include but are not limited to snap connection or screw connection, etc. In another example, the limiting part 13 and the fixing part 71 can be combined together by a non-detachable connection method, and the non-detachable connection methods include but are not limited to bonding or welding, etc. The limiting part 13 is provided on the top cover 10 and can be integrally formed with the top cover 10 or separately formed. The limiting part 13 can be one or more.

[0068] The deformation part 73 can be bent and deformed relative to the fixing part 71, which can ensure that the deformation part 70 can be bent and deformed when the temperature reaches a predetermined temperature threshold, and the explosion-proof valve 30 is opened. The limiting part 13 can restrict the degrees of freedom of movement of the fixing part 71, so that the deformation part 70 is fixedly installed on the top cover 10 to prevent the deformation part 70 from falling off. It can also limit the fixing part 71 when the deformation part 73 is bent and deformed when reaching the predetermined temperature threshold, ensuring that the fixing part 71 will not move along with the deformation part 73 and preventing the deformation part 70 from falling off when being bent and deformed.

[0069] Please refer to Figure 4 and Figure 6 , in some embodiments, the limiting part 13 is provided on the first insulating part 50, and the limiting part 13 is used to restrict at least one degree of freedom of movement of the fixing part 71.

[0070] Specifically, the limiting portion 13 can be provided on the first insulating member 50, and can be integrally formed with the first insulating member 50 or formed separately. The limiting portion 13 can be one or more. When formed separately, the limiting portion 13 and the first insulating member 50 can be detachably connected or non-detachably connected. In one example, the limiting portion 13 and the first insulating member 50 can be combined together by a detachable connection method, and the detachable connection method includes but is not limited to snap connection or screw connection, etc. In another example, the limiting portion 13 and the first insulating member 50 can be combined together by a non-detachable connection method, and the non-detachable connection method includes but is not limited to bonding or welding, etc.

[0071] The deformation portion 73 can be bent and deformed relative to the fixed portion 71, which can ensure that the deformable member 70 can be bent and deformed when the temperature reaches a predetermined temperature threshold, and the explosion-proof valve 30 is opened. The limiting portion 13 can limit the degree of freedom of movement of the fixed portion 71, so that the deformable member 70 is fixedly installed on the first insulating member 50 to prevent the deformable member 70 from falling off. Also, when the deformation portion 73 is bent and deformed when reaching the predetermined temperature threshold, the fixed portion 71 can be limited, ensuring that the fixed portion 71 will not move along with the deformation portion 73 and preventing the deformable member 70 from falling off during bending deformation.

[0072] Of course, in some embodiments, the limiting portions 13 are provided on both the top cover 10 and the first insulating member 50, and the limiting portions 13 are used to limit the degree of freedom of movement of the fixed portion 71 in at least one direction.

[0073] Specifically, the limiting portion 13 can be provided on both the top cover 10 and the first insulating member 50 at the same time. At this time, the limiting portion 13 can be integrally formed with the first insulating member 50, or integrally formed with the first insulating member 50, or the three can be formed separately and then assembled together.

[0074] Please refer to Figure 4 and Figure 5 , in some embodiments, the limiting portion 13 is a groove 131.

[0075] Specifically, when the limiting portion 13 is the groove 131, the groove 131 can be provided on the top cover 10 or on the first insulating member 50, or can be provided on both the top cover 10 and the first insulating member 50 at the same time. When the groove 131 is provided on the top cover 10, in one example, the groove 131 can be provided on the first surface 101 of the top cover 10 and does not penetrate the second surface 103 of the top cover 10; in another example, the groove 131 can be provided on the second surface 103 of the top cover 10 and does not penetrate the first surface 101 of the top cover 10 (not shown); in still another example, the groove 131 can also be provided inside the top cover 10, and does not penetrate the first surface 101 of the top cover 10 nor the second surface 103 of the top cover 10 (not shown). At least part of the shape of the groove 131 cooperates with the shape of the fixing portion 71 to limit the fixing portion 71. In the embodiment of the present application, the groove 131 is provided on the first surface 101 of the top cover 10 and does not penetrate the second surface 103 of the top cover 10. The groove 131 can limit the degrees of freedom of the fixing portion 71 in five directions: movement in the first direction X, movement in the second direction Y, rotation about the first direction X, rotation about the second direction Y, and rotation about the third direction Z. At this time, the first insulating member 50 is connected to the first surface 101 of the top cover 10, and the first insulating member 50 and the top cover 10 together can limit the movement of the fixing portion 71 in the third direction Z, ensure that all degrees of freedom of the fixing portion 71 are limited, and ensure that the deformation portion 73 can be bent and deformed from the first insulating member 50 to the top cover 10 in the third direction Z, thereby triggering the opening of the explosion-proof valve 30.

[0076] The number of the grooves 131 can be one or multiple (greater than or equal to two). When there are multiple grooves 131, the arrangement positions of the grooves 131 on the top cover 10 and / or the first insulating member 50 are not limited. For example, there are 2 grooves 131 in the present application, and the two grooves 131 are symmetrically arranged about the center line of the explosion-proof valve 30 in the second direction Y. For another example, there can be multiple grooves 131, and in the first direction X of the top cover 10, the multiple grooves 131 are equally spaced on the same side of the explosion-proof hole 11. The shape of the projection surface of the groove 131 in the XY plane can be triangular, L-shaped, T-shaped or strip-shaped, or can also be spiral-shaped, which is not limited in the present application.

[0077] When the limiting portion 13 is the groove 131 on the top cover 10 and / or the first insulating member 50, the limiting portion 13 is easy to form, and does not occupy the space of the top cover assembly 100 and / or the first insulating member 50 in the third direction Z, and can reduce the thickness space of the top cover assembly 100 and / or the first insulating member 50. Without occupying space, the groove 131 restricts the degrees of freedom of movement of the fixing portion 71 in at least one direction, can ensure that the fixing portion 71 is fixed in the groove 131, and can ensure that the deformation portion 73 can be bent and deformed from the first insulating member 50 to the top cover 10 in the third direction Z, thereby opening the explosion-proof valve 30.

[0078] Please refer toFigure 4 and Figure 5 In some embodiments, the limiting part 13 is a protrusion (not shown).

[0079] When the limiting part 13 is a protrusion, the protrusion can be provided on the first surface 101 of the top cover 10, can be provided on the side of the first insulating member 50 close to the top cover 10, or can be provided on the first surface 101 of the top cover 10 and the side of the first insulating member 50 close to the top cover 10. The number of protrusions can be one or more. When the number of protrusions is more than one, the multiple protrusions can be all provided on the first surface 101 of the top cover 10, the multiple protrusions can also be all provided on the side of the first insulating member 50 close to the top cover 10, and the multiple protrusions can also be such that some are provided on the first surface 101 of the top cover 10 and the other part is provided on the side of the first insulating member 50 close to the top cover 10. The shape of the protrusion is not limited and can be a sphere, a cylinder, a cube, etc. When the number of protrusions is more than one, the shapes of different protrusions can be the same, can all be different, or can be partially the same. The shape of the projection surface of the protrusion in the XY plane can be a triangle, an L shape, a T shape, or a spiral shape, which is not limited in this application.

[0080] The protrusion restricts the degree of freedom of movement of the fixing part 71 in at least one direction, can ensure that the fixing part 71 is fixed in the groove 131, and can ensure that the deformation part 73 can be bent and deformed from the first insulating member 50 to the top cover 10 in the third direction Z, so as to trigger the opening of the explosion-proof valve 30. The protrusion can also be used as a reinforcing rib to strengthen the strength of the top cover 10 and / or the first insulating member 50.

[0081] Please refer to Figure 4 and Figure 5 In some embodiments, the groove 131 includes a first sub-groove 1311 and a second sub-groove 1313. The first sub-groove 1311 and the second sub-groove 1313 are bent and connected. The fixing part 71 includes a first sub-part 711 and a second sub-part 713. The first sub-part 711 and the second sub-part 713 are bent and connected, the first sub-part 711 is received in the first sub-groove 1311, and the second sub-part 713 is received in the second sub-groove 1313.

[0082] Specifically, when the groove 131 is L-shaped, the first sub-groove 1311 is not communicated with the explosion-proof hole 11, and the second sub-groove 1313 is communicated with the explosion-proof hole 11. The first sub-groove 1311 and the second sub-groove 1313 are bent and connected, and any end of the first sub-groove 1311 can be connected to any end of the second sub-groove 1313. The angle at which the first sub-groove 1311 and the second sub-groove 1313 are bent and connected is not limited. In this application, the first sub-groove 1311 and the second sub-groove 1313 are connected at a 90-degree angle, that is, the first sub-groove 1311 is perpendicular to the second sub-groove 1313. The shape of the fixing part 71 is matched with the groove 131. In the fixing part 71, the first sub-part 711 is accommodated in the first sub-groove 1311, and the second sub-part 713 is accommodated in the second sub-groove 1313.

[0083] The bending connection between the first sub-groove 1311 and the second sub-groove 1313 can provide additional mechanical interlocking for the first sub-part 711 and the second sub-part 713, that is, the first sub-groove 1311 and the second sub-groove 1313 can fix the first sub-part 711 and the second sub-part 713 more firmly, enhance the stability of the fixing part 71, and prevent the deformation part 73 from falling off.

[0084] Please refer to Figure 4 and Figure 6 , in some embodiments, there is one deformation member 70, and in the second direction Y of the top cover 10, the extending direction of the deformation part 73 is the same as the extending direction of the length bisecting line of the explosion-proof valve 30.

[0085] Specifically, in the second direction Y, the center line of the explosion-proof valve 30 is the width center line. The extending direction of the deformation part 73 is the same as the width center line of the explosion-proof valve 30. Compared with the case where the extending direction of the deformation part 73 is the same as the length center line (along the first direction X) of the explosion-proof valve 30, the deformation part 73 can lift the explosion-proof valve 30 with a smaller second acting force. More specifically, the deformation part 73 can be located on the width center line of the explosion-proof valve 30. In this way, when the deformation member 70 switches from the first state to the second state, the second acting force exerted by the bent and deformed deformation part 73 on the explosion-proof valve 30 is located on the width center line of the explosion-proof valve 30, and the explosion-proof valve 30 is more easily lifted by the bent and deformed deformation part 73.

[0086] Please refer to Figure 4 and Figure 6 , in some embodiments, the deformation member 70 includes two, and the two deformation parts 73 are symmetrically arranged with respect to the center line of the explosion-proof valve 30.

[0087] Specifically, the center line of the explosion-proof valve 30 includes the width center line along the second direction Y and the length center line along the first direction X. The deformation part 73 can be symmetrically arranged with respect to the width center line or the length center line.

[0088] The second force applied by the symmetrically arranged deformation parts 73 to the explosion-proof valve 30 is symmetrically distributed, which is beneficial to the uniform application of force by the deformation member 70, thereby opening the explosion-proof valve 30. The two deformation members 70 act together, so that the second force required for a single deformation member 70 to open the explosion-proof valve 30 is smaller, and the service life of the deformation member 70 can be extended. The two deformation members 70 also provide a redundant design to ensure that when one deformation member 70 fails to trigger and open the explosion-proof valve 30, the other deformation member 70 can still trigger and open the explosion-proof valve 30, improving the reliability of the top cover assembly 100.

[0089] Please refer to Figure 4 and Figure 6 , in some embodiments, the deformation member 70 includes a plurality of them. In the first direction X of the top cover 10, a plurality of deformation parts 73 are equally spaced on the same side of the explosion-proof hole 11.

[0090] Specifically, a plurality of deformation parts 73 are equally spaced on the same side of the explosion-proof hole 11, that is, on the side close to the limiting part 13, so that the deformation parts 73 of the plurality of deformation members 70 can apply a second force to the same side of the explosion-proof valve 30, thereby better opening the explosion-proof valve 30. The plurality of deformation members 70 also provide a redundant design to ensure that when some deformation members 70 fail to trigger and open the explosion-proof valve 30, other deformation members 70 can still trigger and open the explosion-proof valve 30, improving the reliability of the top cover assembly 100.

[0091] Please refer to Figure 1 and Figure 7 , in some embodiments, the explosion-proof valve 30 includes a scored area 31 and an unscored area 33. The scored area 31 is in the shape of an unclosed ring. The unscored area 33 is connected to the opposite ends of the scored area 31 and encloses a closed ring. The thickness of the scored area 31 is less than the thickness of the unscored area 33. In the extending direction of the deformation part 73, the free end 731 of the deformation part 73 away from the fixing part 71 is closer to the scored area 31 than the unscored area 33.

[0092] Specifically, the thicknesses of the scored area 31 and the unscored area 33 refer to the sizes in the third direction Z. The thickness of the scored area 31 is less than the thickness of the unscored area 33, which enables the scored area 31 to be more easily torn to open the explosion-proof valve 30. The free end 731 is closer to the scored area 31, so that when the deformation part 73 is bent and deformed, the unscored area 33 forms a connecting section, and the second force applied by the free end 731 to the scored area 31 forces the explosion-proof valve 30 to be torn along the scored area 31 and bend toward the side where the second surface 103 of the top cover 10 is located with the unscored area 33 as the fulcrum, thereby realizing the opening of the explosion-proof valve 30.

[0093] Please refer to Figure 1 and Figure 7, in some embodiments, in the projection plane in the third direction Z of the vertical explosion-proof valve 30, the overlapping length of the deformation part 73 and the explosion-proof valve 30 is at least more than half of the width of the explosion-proof valve 30.

[0094] Specifically, the overlapping length of the deformation part 73 and the explosion-proof valve 30 is: in the XY plane, the length of the projection surface where the deformation part 73 and the explosion-proof valve 30 overlap in the second direction Y. The overlapping length of the deformation part 73 and the explosion-proof valve 30 being at least more than half of the width of the explosion-proof valve 30 can increase the contact area between the deformation part 73 and the explosion-proof valve 30 when the deformation part 73 is bent, thereby increasing the acting area of the second acting force, which is more conducive to opening the explosion-proof valve 30.

[0095] Please refer to Figure 1 and Figure 7 , in some embodiments, when the explosion-proof valve 30 closes the explosion-proof valve 30, the deformation part 70 contacts the explosion-proof valve 30, and the contact area between the deformation part 70 and the explosion-proof valve 30 is smaller than the area where the deformation part 70 and the explosion-proof valve 30 do not contact.

[0096] Specifically, when the explosion-proof valve 30 closes the explosion-proof hole 11, the deformation part 70 may or may not contact the explosion-proof valve 30. When the deformation part 70 contacts the explosion-proof valve 30, the explosion-proof valve 30 includes a contact area that contacts the deformation part 70 and a non-contact area that does not contact the deformation part 70. The contact area between the deformation part 70 and the explosion-proof valve 30 being smaller than the area where the deformation part 70 and the explosion-proof valve 30 do not contact means that the area of the contact area is smaller than the area of the non-contact area. On the one hand, the setting where the area of the contact area is smaller than the area of the non-contact area can reduce the risk of mis-triggering of the explosion-proof valve 30 due to vibration or other non-predetermined factors when the explosion-proof valve 30 is triggered in the temperature-triggering mode. On the other hand, when the explosion-proof valve 30 is triggered in the air pressure-triggering mode, the acting force of the air pressure applied to the non-contact area on the explosion-proof valve 30 is greater than the acting force of the air pressure applied to the contact area on the explosion-proof valve 30. Therefore, the setting where the area of the contact area is smaller than the area of the non-contact area can ensure that the explosion-proof valve 30 can be more easily lifted and opened when the explosion-proof valve 30 is triggered in the air pressure-triggering mode.

[0097] Please refer to Figure 1 and Figure 10 , in some embodiments, the top cover 10 is provided with a through hole 15 that penetrates the first surface 101 and the second surface 103. The top cover assembly 100 may further include a second insulating member 80 and an electrode terminal 90. The second insulating member 80 is disposed on the side where the second surface 103 of the top cover 10 is located. The electrode terminal 90 passes through the through hole 15 and protrudes relative to both the first surface 101 and the second surface 103. In the third direction Z of the top cover 10, the first insulating member 50 is located between the electrode terminal 90 and the top cover 10, and the second insulating member 80 is located between the electrode terminal 90 and the top cover 10.

[0098] Specifically, in the embodiments of the present application, there are two electrode terminals 90, namely the positive electrode terminal and the negative electrode terminal. A second insulating member 80 is provided between the electrode terminal 90 and the second surface 103 of the top cover 10, and a first insulating member 50 is provided between the electrode terminal 90 and the first surface 101 of the top cover 10. The second insulating member 80 is used to achieve electrical insulation between the electrode terminal 90 and the top cover 10 and prevent short circuits.

[0099] Please refer to Figure 1 、 Figure 10 and Figure 11 , the present application provides a battery 1000, which includes the top cover assembly 100, the housing 300, and the battery cell 500 of any one of the above embodiments. The housing 300 is provided with an opening 301, and the top cover assembly 100 is installed on the housing 300 and closes the opening 301. The battery cell 500 is accommodated in the housing 300, and the tab 700 on the battery cell 500 is electrically connected to the electrode terminal 90 of the top cover assembly 100.

[0100] Specifically, the housing 300 can be a cylindrical structure, and an accommodation cavity is formed inside the housing 300 for accommodating the battery cell 500 and the electrolyte. At least one end of the housing 300 is provided with an opening 301, so that the battery cell 500 can be placed in the accommodation cavity of the housing 300 through the opening 301 and covered by the top cover assembly 100 on the opening 301. Among them, the housing 300 can include metal materials such as aluminum or aluminum alloy, or can also include insulating materials such as plastic. In some embodiments, the cross-sectional shape of the housing 300 can be circular, and in other embodiments, the cross-sectional shape of the housing 300 can be rectangular, that is, the battery 1000 is a square battery. The present application is only illustrated by taking the battery 1000 as a square battery as an example.

[0101] In the present application, a deformation member 70 is added at a position corresponding to the explosion-proof valve 30 of the top cover assembly 100 of the battery 1000. When the internal pressure of the battery 1000 does not reach the critical pressure capable of breaking through the explosion-proof valve 30, but the internal temperature of the battery 1000 has risen sharply and is higher than the predetermined temperature threshold of the deformation member 70, the deformation member 70 can be bent and deformed to trigger the opening of the explosion-proof valve 30, and the internal pressure relief of the battery 1000 can also be achieved, thereby avoiding safety problems such as explosion and fire of the battery 1000 and improving the use safety of the battery 1000.

[0102] Please refer to Figure 10 and Figure 12 , the present application provides an energy storage device 3000, which includes the battery 1000 of any one of the above embodiments.

[0103] Specifically, the energy storage device 3000 of the present application refers to a device that can convert the chemical energy stored therein into electrical energy, that is, a device that converts the pre-stored energy into electrical energy available for external use. The energy storage device 3000 can be charged and store electrical energy, or can be discharged to supply power to other external devices. It can be understood that the energy storage device 3000 can include, but is not limited to, a battery pack, a battery module, or a battery system, etc.

[0104] In some embodiments of the present application, the energy storage device 3000 includes a plurality of batteries 1000 and a box body 2000. The box body 2000 is used to provide an accommodation space for the batteries 1000, and the box body 2000 can adopt various structures. In some embodiments, the box body 2000 can include a box cover 2001 and a box body 2003. The box cover 2001 and the box body 2003 are covered with each other, and the box cover 2001 and the box body 2003 jointly define an accommodation space for accommodating the batteries 1000. The box body 2003 can be a hollow structure with one end open, and the box cover 2001 can be a plate-like structure. The box cover 2001 is covered on the open side of the box body 2003 so that the box cover 2001 and the box body 2003 jointly define an accommodation space; the box cover 2001 and the box body 2003 can also both be hollow structures with one side open, and the open side of the box cover 2001 is covered on the open side of the box body 2003. Of course, the box body formed by the box cover 2001 and the box body 2003 can be of various shapes, for example, a cylinder or a cuboid, etc. The energy storage device 3000 can also include other structures. For example, the energy storage device 3000 can also include a busbar component for realizing the electrical connection between the plurality of batteries 1000.

[0105] By adding a deformation member 70 at a position corresponding to the explosion-proof valve 30 of the top cover assembly 100 of the battery 1000 in the energy storage device 3000, when the air pressure inside the battery 1000 does not reach the critical air pressure that can break through the explosion-proof valve 30, but the internal temperature of the battery 1000 has risen sharply and is higher than the predetermined temperature threshold of the deformation member 70, the deformation member 70 can be bent and deformed to trigger the opening of the explosion-proof valve 30, and the pressure relief inside the battery 1000 can also be realized, thereby avoiding safety problems such as explosion and fire of the battery 1000 and improving the use safety of the battery 1000.

[0106] Please refer to Figure 10 and Figure 13 , the present application provides an electrical device 10000. The electrical device 10000 includes the energy storage device 3000 of any of the above embodiments, and the energy storage device 3000 provides electrical energy for the electrical device 10000.

[0107] Specifically, the top cover assembly 100 disclosed in the present application can be used in electrical equipment 10,000 that uses the energy storage device 3,000 as a power source or various energy storage systems that use the energy storage device 3,000 as an energy storage element. The electrical equipment 10,000 can be, but is not limited to, mobile phones, tablets, laptop computers, electric toys, power tools, battery cars, electric vehicles, ships, spacecraft, etc. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric aircraft toys, etc. Spacecraft can include airplanes (including drones), rockets, space shuttles, and spaceships, etc.

[0108] In the present application, only the electrical equipment 10,000 being a vehicle is taken as an example for illustration. Please refer to Figure 13 , Figure 13 which is a schematic structural diagram of a vehicle provided in some embodiments of the present application. The vehicle can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, etc. An energy storage device 3,000 is provided inside the vehicle. The energy storage device 3,000 can be arranged at the bottom, head, or tail of the vehicle. The energy storage device 3,000 can be used for power supply of the vehicle. For example, the energy storage device 3,000 can be used as the operating power source of the vehicle. The vehicle can also include a controller and a motor. The controller is used to control the energy storage device 3,000 to supply power to the motor. For example, it is used for the working power requirements during the start, navigation, and driving of the vehicle.

[0109] In some embodiments of the present application, the energy storage device 3,000 can not only be used as the operating power source of the vehicle, but also be used as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0110] By adding a deformation member 70 at a position corresponding to the explosion-proof valve 30 of the top cover assembly 100 of the battery 1000 of the energy storage device 3,000 in the electrical equipment 10,000, when the air pressure inside the battery 1000 has not reached the critical air pressure that can break through the explosion-proof valve 30, but the internal temperature of the battery 1000 has risen sharply and is higher than the predetermined temperature threshold of the deformation member 70, the deformation member 70 can be bent and deformed to trigger the opening of the explosion-proof valve 30, and the pressure relief inside the battery 1000 can also be realized, thereby avoiding safety problems such as explosion and fire of the battery 1000 and improving the use safety of the battery 1000.

[0111] Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to the embodiments of the present application without departing from the principle and purpose of the present application. The scope of the present application is defined by the claims and their equivalents.

Claims

1. A top cover assembly, characterized in that, The top cover assembly includes: A top cover, the top cover includes a first surface and a second surface facing away from each other, and the top cover is provided with an explosion-proof hole penetrating through the first surface and the second surface; An explosion-proof valve, the explosion-proof valve is installed on the top cover and is used to close the explosion-proof hole; and A deformation member, the deformation member is installed on the top cover and is at least partially disposed at the bottom of the explosion-proof valve, When the temperature of the deformation member reaches a predetermined temperature threshold, the deformation member deforms and triggers the opening of the explosion-proof valve; and / or, When the gas pressure received by the explosion-proof valve reaches a predetermined air pressure threshold, the explosion-proof valve opens.

2. The top cover assembly according to claim 1, characterized in that, The deformation member is a shape memory metal. When the temperature of the deformation member is less than the predetermined temperature threshold, the deformation member is in a first state, and the first acting force between the deformation member and the explosion-proof valve is less than the opening acting force required for the explosion-proof valve to open; When the temperature of the deformation member reaches the predetermined temperature threshold, the deformation member is in a second state of bending deformation, and the second acting force between the deformation member and the explosion-proof valve is greater than the opening acting force.

3. The top cover assembly according to claim 1, characterized in that, The deformation member includes a connected fixing portion and a deformation portion. When the temperature of the deformation member reaches a predetermined temperature threshold, the deformation portion can bend and deform relative to the fixing portion; A limiting portion is provided on the top cover, and the limiting portion is used to limit the degree of freedom of movement of the fixing portion in at least one direction.

4. The top cover assembly according to claim 3, characterized in that, The limiting portion is a groove or a protrusion.

5. The top cover assembly according to claim 3, wherein The limiting portion is a groove, the groove includes a first sub-groove and a second sub-groove, the first sub-groove and the second sub-groove are bent and connected, the fixing portion includes a first sub-portion and a second sub-portion, the first sub-portion and the second sub-portion are bent and connected, the first sub-portion is received in the first sub-groove, and the second sub-portion is received in the second sub-groove.

6. The top cover assembly according to claim 3, wherein There is one deformation member. In the width direction of the top cover, the extending direction of the deformation portion is the same as the extending direction of the center line of the explosion-proof valve; or The deformation member includes two, and the two deformation portions are symmetrically arranged about the length center line of the explosion-proof valve; or The deformation member includes a plurality of, and in the length direction of the top cover, the plurality of deformation portions are equally spaced on the same side of the explosion-proof hole.

7. The top cover assembly according to claim 3, characterized in that, The explosion-proof valve includes a scored area and a non-scored area. The scored area is in a non-closed ring shape, the non-scored area is connected to the opposite ends of the scored area and encloses a closed ring shape. The thickness of the scored area is less than the thickness of the non-scored area. In the extending direction of the deformation portion, the free end of the deformation portion away from the fixing portion is closer to the scored area than the non-scored area.

8. The top cover assembly according to claim 3, characterized in that, In the projection plane perpendicular to the thickness direction of the explosion-proof valve, the overlapping length between the deformation portion and the explosion-proof valve is at least more than half of the width of the explosion-proof valve.

9. The top cover assembly according to claim 1, characterized in that When the explosion-proof valve closes the explosion-proof hole, the deformation member contacts the explosion-proof valve, and the contact area between the deformation member and the explosion-proof valve is smaller than the non-contact area between the deformation member and the explosion-proof valve.

10. The top cover assembly according to claim 1, wherein The top cover is provided with electrode through holes penetrating through the first surface and the second surface; the top cover assembly further includes: A first insulating member disposed on one side where the first surface of the top cover is located; A second insulating member disposed on one side where the second surface of the top cover is located; and An electrode terminal passing through the electrode through hole and protruding relative to both the first surface and the second surface. In the thickness direction of the top cover, the first insulating member is located between the electrode terminal and the top cover, and the second insulating member is located between the electrode terminal and the top cover.

11. A battery, characterized in that, Comprising: The top cover assembly according to any one of claims 1-10; A housing having an opening, the top cover assembly being mounted on the housing and closing the opening; and An electric core accommodated in the housing, and the tab on the electric core is electrically connected to the electrode terminal of the top cover assembly.

12. An energy storage device, characterized in that, Including the battery according to claim 11.

13. An electrical device, characterized in that, Including the energy storage device according to claim 12.

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