Battery monomer, battery device and electric equipment

Abstract

The utility model relates to a single battery, a battery device and electric equipment, the single battery comprises an explosion-proof valve, the explosion-proof valve comprises a valve cover and a valve body, the valve cover is movably connected to the valve body, and the valve cover has a first state for blocking a pressure relief hole and a second state for opening the pressure relief hole; wherein the valve cover is provided with a first side wall, the valve body is provided with a second side wall, and in the direction from the valve body to the valve cover, the second side wall and the first side wall are obliquely arranged outwards relative to the central axis of the valve body; when the valve cover is in the first state, the first side wall abuts against the second side wall so that the pressure relief hole can be isolated from the external environment. And when the valve cover is in the second state, the first side wall is separated from the second side wall. The battery device comprises the battery monomer. The electric equipment comprises the battery device. According to the battery monomer, the battery device and the electric equipment, a relatively good sealing effect can be formed between the valve cover and the valve body, and the probability of sealing failure of the anti-explosion valve in the battery monomer is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, in particular to a battery monomer, a battery device and electrical equipment. Background Art

[0002] At present, lithium-ion batteries are widely used in electric vehicles, consumer electronics and other fields due to their high energy density and long service life. In batteries, explosion-proof valves play a vital role in battery safety. When thermal runaway problems such as short circuit, overcharging, and overheating occur, the explosion-proof valves open in time by sensing the changes in the internal air pressure of the battery to exhaust and release pressure, avoiding risks such as battery explosion or fire.

[0003] In the explosion-proof valve, since the valve cover opens the pressure relief hole during pressure relief, the internal space of the battery is interconnected with the outside world. When the explosion-proof valve completes pressure relief, the valve cover and the valve body cannot fit well due to processing errors or other reasons, resulting in the valve cover and the valve body being unable to seal and resulting in sealing failure, which may affect the safety of the battery pack. Utility Model Content

[0004] Based on this, it is necessary to provide a battery cell, a battery device and an electrical device to address the problem of sealing failure of existing explosion-proof valves.

[0005] A battery cell includes an explosion-proof valve, which includes a valve cover and a valve body. The valve body has a pressure relief hole, the valve cover is movably connected to the valve body, and the valve cover has a first state of blocking the pressure relief hole and a second state of opening the pressure relief hole; wherein the valve cover has a first side wall, and the valve body has a second side wall, in the direction from the valve body to the valve cover, the second side wall and the first side wall are both inclined outwardly relative to the central axis of the valve body; when the valve cover is in the first state, the first side wall abuts against the second side wall to isolate the pressure relief hole from the external environment; when the valve cover is in the second state, the first side wall is separated from the second side wall. In the above-mentioned battery cell, the valve cover has a first state of blocking the pressure relief hole and a second state of opening the pressure relief hole. When the valve cover is in the first state, the first side wall abuts against the second side wall. Because the second side wall and the first side wall are both inclined outward in the direction from the valve body to the valve cover, a lateral extrusion seal is formed between the second side wall and the first side wall, which can form a better sealing effect between the valve cover and the valve body, so that the pressure relief hole is better isolated from the external environment, reducing the probability of failure of the explosion-proof valve seal in the battery cell.

[0006] In some embodiments, the valve cover has a top wall, a bottom wall and a first side wall, the top wall and the bottom wall are arranged opposite to each other along a first direction, the first side wall is configured as a circumferential side wall located between the top wall and the bottom wall and arranged along the outer circumference of the two walls, and the first direction is the thickness direction of the valve cover. In this way, the outer diameter of the valve cover can be gradually increased in the direction from the valve body to the valve cover, and the circumferential side wall of the valve cover is inclined outward, so that the valve cover and the valve body are laterally squeezed and sealed.

[0007] In some embodiments, the valve body is provided with a receiving groove for accommodating the valve cover, and the second side wall is configured as a circumferential side wall arranged along the inner circumference of the receiving groove. In this way, in the direction from the valve body to the valve cover, the circumferential side wall of the valve body can be inclined outward, so that the valve cover and the valve body are laterally squeezed and sealed.

[0008] In some embodiments, the explosion-proof valve further comprises a first sealing member, which is disposed on the valve cover and / or the valve body; when the valve cover is in the first state, the first sealing member is sandwiched between the first side wall and the second side wall. Thus, by providing the first sealing member, the sealing between the first side wall and the second side wall can be strengthened.

[0009] In some embodiments, the first side wall is provided with a first groove, and the first sealing member is confined in the first groove. Thus, by fixing the first sealing member to the first side wall of the valve cover, the space utilization of the valve cover can be improved.

[0010] In some embodiments, the first sealing member is constructed as a solid structure, so that when the pressure relief hole is blocked, the first sealing member has a certain ability to withstand compression, so that a good sealing effect is maintained between the first side wall and the second side wall.

[0011] In some embodiments, the explosion-proof valve further includes an elastic member, which is disposed between the valve body and the valve cover, and the valve cover can be switched between the first state and the second state under the action of the elastic member. In this way, the elastic member can play a buffering role during the switching of the valve cover between the first state and the second state; and when the valve cover is in the first state of blocking the pressure relief hole, the valve cover can be automatically aligned, thereby improving the situation where the sealing failure is caused by the inability of the valve cover and the valve body to cover each other.

[0012] In some embodiments, a first fixing column is provided on the side of the valve cover facing the valve body, and the first end of the elastic member is connected to the first fixing column. In this way, the first end of the elastic member can be fixed to the side of the valve cover facing the valve body, which has a simple structure and a reasonable design.

[0013] In some embodiments, the first fixing column includes a connecting portion and a limiting portion, the connecting portion is arranged between the limiting portion and the valve cover, the outer diameter of the limiting portion is greater than or equal to the inner diameter of the first end portion of the elastic member, and the first end portion of the elastic member is sleeved on the connecting portion and limited by the limiting portion. In this way, the limiting portion limits the first end portion of the elastic member, thereby reducing the probability of the first end portion of the elastic member falling off the first fixing column.

[0014] In some embodiments, the first fixing column and the valve cover are integrated into one structure, so that the first fixing column and the valve cover have good integrity and high mechanical strength, which facilitates the simplified assembly structure.

[0015] In some embodiments, a second fixing column is provided on the side of the valve body facing the valve cover, and the second end of the elastic member away from the valve cover is connected to the second fixing column. In this way, the second end of the elastic member can be fixed to the side of the valve body facing the valve cover, which is simple in structure and reasonable in design.

[0016] In some embodiments, a notch is provided on one side of the valve body facing the valve cover, and the second fixing column is protruded on the inner circumference of the notch and accommodated in the notch. In this way, the second fixing column is protruded on the inner circumference of the notch and accommodated in the notch, which can improve the space utilization of the valve body.

[0017] In some embodiments, the valve body includes a main body and a seat body, the seat body is arranged on a side of the main body away from the valve cover, the main body is provided with an escape groove for the elastic member to pass through, the seat body is provided with a cavity for the elastic member to pass through, the cavity is connected to the escape groove, and the second fixing column is arranged on the bottom wall of the cavity. In this way, when the valve cover is switched between the first state and the second state, the elastic member can freely expand and contract in the cavity and the escape groove.

[0018] In some embodiments, the explosion-proof valve further comprises a second sealing member, a second groove is provided on the side of the main body away from the valve cover, and the second sealing member is limited in the second groove. In this way, by fixing the second sealing member to the side of the valve body away from the valve cover, the space utilization of the valve body can be improved, and the side of the explosion-proof valve facing the inside of the battery cell can achieve sealing performance.

[0019] A battery device includes the above-mentioned battery cell. The valve cover of the above-mentioned battery device has a first state of blocking the pressure relief hole and a second state of opening the pressure relief hole. When the valve cover is in the first state, the first side wall abuts against the second side wall. Because the second side wall and the first side wall are both inclined outward in the direction from the valve body to the valve cover, the second side wall and the first side wall form a lateral extrusion seal, which can form a good sealing effect between the valve cover and the valve body, so that the pressure relief hole is better isolated from the external environment, and the probability of failure of the explosion-proof valve seal in the battery cell is reduced.

[0020] An electrical device includes the above-mentioned battery device. In the above-mentioned electrical device, a good sealing effect is formed between the valve cover and the valve body of the battery device, so that the pressure relief hole is well isolated from the external environment, and the probability of sealing failure of the explosion-proof valve in the battery cell is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of electrical equipment in some embodiments of the present application.

[0022] Figure 2 Schematic diagram of a battery device in some embodiments of the present application.

[0023] Figure 3 This is an exploded view of a battery cell in some embodiments of the present application.

[0024] Figure 4 This is a schematic diagram of the combination of explosion-proof valves in some embodiments of the present application from a first perspective.

[0025] Figure 5 for Figure 4 A top view of the explosion proof valve is shown.

[0026] Figure 6 for Figure 5 The explosion-proof valve is shown in a cross-sectional view taken along plane AA, wherein the valve cover is in a first state.

[0027] Figure 7 for Figure 5 The explosion-proof valve is shown in a cross-sectional view taken along plane AA, wherein the valve cover is in a second state.

[0028] Figure 8 This is a schematic diagram of the combination of explosion-proof valves in some embodiments of the present application from a second viewing angle.

[0029] Fig. 9 for Figure 8 A partial enlarged view of point B of the explosion-proof valve shown.

[0030] Fig.10 for Figure 8 Exploded view of the explosion proof valve shown.

[0031] Fig.11 for Fig.10 A partial enlarged view of point C of the explosion-proof valve shown.

[0032] Reference numerals:

[0033] 10. Vehicle; 11. Controller; 12. Motor; 20. Battery device; 21. Box; 21a. First part; 21b. Second part; 22. Battery cell; 23. End cover; 24. Shell; 25. Electrode assembly; 30. Explosion-proof valve; 100. Valve cover; 101. First side wall; 102. Top wall; 103. Bottom wall; 110. First groove; 120. First fixing column; 121. Connecting part; 122, limit portion; 200, valve body; 201, second side wall; 202, main body; 202a, avoidance groove; 202b, second groove; 203, seat body; 203a, cavity; 210, pressure relief hole; 220, accommodating groove; 230, second fixing column; 240, notch; 300, first sealing member; 400, elastic member; 410, first end portion; 420, second end portion; 500, second sealing member. DETAILED DESCRIPTION

[0034] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0036] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0037] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0038] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0039] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0040] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0041] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0042] At present, lithium-ion batteries are widely used in electric vehicles, consumer electronics and other fields due to their high energy density and long service life. In batteries, explosion-proof valves play a vital role in battery safety. When thermal runaway problems such as short circuit, overcharging, and overheating occur, the explosion-proof valves open in time by sensing the changes in the internal air pressure of the battery to exhaust and release pressure, avoiding risks such as battery explosion or fire.

[0043] In the explosion-proof valve, since the valve cover opens the pressure relief hole during pressure relief, the internal space of the battery is interconnected with the outside world. When the explosion-proof valve completes pressure relief, the valve cover and the valve body cannot fit well due to processing errors or other reasons, resulting in the valve cover and the valve body being unable to seal and resulting in sealing failure, which may affect the safety of the battery pack.

[0044] Based on the above considerations, a battery cell, a battery device and an electrical equipment are designed. In the battery cell, the valve cover has a first state of blocking the pressure relief hole and a second state of opening the pressure relief hole. When the valve cover is in the first state, the first side wall abuts against the second side wall. Because the second side wall and the first side wall are both inclined outward in the direction from the valve body to the valve cover, a lateral extrusion seal is formed between the second side wall and the first side wall, which can form a better sealing effect between the valve cover and the valve body, so as to better isolate the pressure relief hole from the external environment and reduce the probability of failure of the explosion-proof valve seal in the battery cell.

[0045] The embodiment of the present application provides an electric device using a battery device as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0046] For the convenience of description, the following embodiments are described by taking a vehicle 10 as an example of an electrical device in an embodiment of the present application.

[0047] Please refer to Figure 1 The vehicle 10 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle. A battery device 20 is provided inside the vehicle 10. The battery device 20 may be provided at the bottom, head or tail of the vehicle 10. The battery device 20 may be used to power the vehicle 10. For example, the battery device 20 may be used as an operating power source for the vehicle 10. The vehicle 10 may further include a controller 11 and a motor 12. The controller 11 is used to control the battery device 20 to power the motor 12, for example, to meet the power requirements for starting, navigating and driving the vehicle 10.

[0048] In some embodiments of the present application, the battery device 20 can not only serve as an operating power source for the vehicle 10 , but also serve as a driving power source for the vehicle 10 , replacing or partially replacing fuel or natural gas to provide driving force for the vehicle 10 .

[0049] Please refer to Figure 2The battery device 20 includes a box body 21 and a battery cell 22, and the battery cell 22 is accommodated in the box body 21. The box body 21 is used to provide a storage space for the battery cell 22, and the box body 21 can adopt a variety of structures. The box body 21 includes a first part 21a and a second part 21b, and the first part 21a and the second part 21b cover each other, and the first part 21a and the second part 21b jointly define a storage space for accommodating the battery cell 22. The second part 21b can be a hollow structure with one end open, and the first part 21a can be a plate-like structure, and the first part 21a covers the open side of the second part 21b, so that the first part 21a and the second part 21b jointly define a storage space; the first part 21a and the second part 21b can also be hollow structures with one side open, and the open side of the first part 21a covers the open side of the second part 21b. Of course, the box body formed by the first part 21a and the second part 21b can be a variety of shapes, such as a cylinder, a cuboid, etc.

[0050] In the battery device 20, there can be multiple battery cells 22, and the multiple battery cells 22 can be connected in series, in parallel, or in a mixed connection. The mixed connection means that the multiple battery cells 22 are both connected in series and in parallel. The multiple battery cells 22 can be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 22 is accommodated in the box; of course, the battery device 20 can also be a battery module formed by connecting multiple battery cells 22 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box. The battery device 20 can also include other structures. For example, the battery device 20 can also include a busbar component for realizing electrical connection between the multiple battery cells 22.

[0051] Each battery cell 22 may be a secondary battery or a primary battery, or a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 22 may be cylindrical, flat, rectangular, or in other shapes.

[0052] The following describes in detail any battery cell 22. Figure 3 As shown, the battery cell 22 includes an end cover 23 , a housing 24 and an electrode assembly 25 .

[0053] The end cap 23 refers to a component that covers the opening of the shell 24 to isolate the internal environment of the battery cell 22 from the external environment. Without limitation, the shape of the end cap 23 can be adapted to the shape of the shell 24 to match the shell 24. Optionally, the end cap 23 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 23 is not easily deformed when squeezed and collided, so that the battery cell 22 can have a higher structural strength and the safety performance can also be improved. Functional components such as electrode terminals can be provided on the end cap 23. The electrode terminal can be used to electrically connect with the electrode assembly 25 for outputting or inputting the electrical energy of the battery cell 22. In some embodiments, the end cap 23 can also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 22 reaches a threshold. The material of the end cap 23 can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this. In some embodiments, an insulating member may be provided inside the end cap 23, and the insulating member may be used to isolate the electrical connection components in the housing 24 from the end cap 23 to reduce the risk of short circuit. For example, the insulating member may be plastic, rubber, or the like.

[0054] The shell 24 is a component used to cooperate with the end cap 23 to form the internal environment of the battery cell 22, wherein the formed internal environment can be used to accommodate the electrode assembly 25, the electrolyte and other components. The shell 24 and the end cap 23 can be independent components, and an opening can be set on the shell 24, and the internal environment of the battery cell 22 is formed by covering the opening with the end cap 23 at the opening. Without limitation, the end cap 23 and the shell 24 can also be integrated. Specifically, the end cap 23 and the shell 24 can form a common connection surface before other components are put into the shell, and when the interior of the shell 24 needs to be encapsulated, the end cap 23 covers the shell 24. The shell 24 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 24 can be determined according to the specific shape and size of the electrode assembly 25. The material of the shell 24 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0055] The electrode assembly 25 is a component in the battery cell 22 where electrochemical reactions occur. One or more electrode assemblies 25 may be included in the housing 24. The electrode assembly 25 is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body of the battery cell assembly, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute a lug. The positive electrode lug and the negative electrode lug may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the lugs connect the electrode terminals to form a current loop.

[0056] Please refer to Figures 3 to 7 In one embodiment, the battery cell 22 includes an explosion-proof valve 30, which includes a valve cover 100 and a valve body 200. The valve body 200 has a pressure relief hole 210. The valve cover 100 is movably connected to the valve body 200, and the valve cover 100 has a first state of blocking the pressure relief hole 210 and a second state of opening the pressure relief hole 210; wherein the valve cover 100 has a first side wall 101, and the valve body 200 has a second side wall 201. In the direction from the valve body 200 to the valve cover 100, the second side wall 201 and the first side wall 101 are both inclined outwardly relative to the central axis of the valve body 200; when the valve cover 100 is in the first state, the first side wall 101 abuts against the second side wall 201 to isolate the pressure relief hole 210 from the external environment; when the valve cover 100 is in the second state, the first side wall 101 is separated from the second side wall 201.

[0057] It should be noted that the direction from the valve body 200 to the valve cover 100, that is, Figure 6 In the direction from the valve body 200 to the valve cover 100, the second side wall 201 and the first side wall 101 are both inclined outwards, which can be understood as: Figure 6 In the Z direction, the second side wall 201 and the first side wall 101 are both in an outward expansion structure.

[0058] In the embodiment of the present application, the explosion-proof valve 30 is configured to be opened when the battery cell 22 has thermal runaway, so as to release the thermal runaway gas inside the battery cell 22. Optionally, the explosion-proof valve 30 can be provided on the end cover 23 of the battery cell 22, or on the housing 24 of the battery cell 22.

[0059] In the embodiment of the present application, the valve body 200 has a pressure relief hole 210, which refers to a structure on the valve body 200 through which gas, liquid, etc. can pass. The number of the pressure relief hole 210 is not limited to one, and when there are at least two pressure relief holes 210, each pressure relief hole 210 is evenly distributed on the valve body 200. The shape of the pressure relief hole 210 can be circular, elliptical or other shapes, and the shape and number of the pressure relief hole 210 are not limited here.

[0060] In the embodiment of the present application, the valve cover 100 is a component movably connected to the valve body 200, and the function of the valve cover 100 is to block the pressure relief hole 210 or open the pressure relief hole 210. Figure 6 During normal use of the battery cell 22, the valve cover 100 is in the first state, at which time the pressure relief hole 210 is blocked and gas cannot pass through the valve body 200; Figure 7 When thermal runaway occurs inside the battery, the valve cover 100 moves under the pressure of the internal gas, and the valve cover 100 switches to the second state. At this time, the pressure relief hole 210 is opened, and the gas can be discharged in time through the valve body 200.

[0061] In the above-mentioned battery cell 22, the valve cover 100 has a first state of blocking the pressure relief hole 210 and a second state of opening the pressure relief hole 210. When the valve cover 100 is in the first state, the first side wall 101 abuts against the second side wall 201. Because the second side wall 201 and the first side wall 101 are both inclined outward in the direction from the valve body 200 to the valve cover 100, a lateral extrusion seal is formed between the second side wall 201 and the first side wall 101, which can form a better sealing effect between the valve cover 100 and the valve body 200, so that the pressure relief hole 210 is better isolated from the external environment, reducing the probability of sealing failure of the explosion-proof valve 30 in the battery cell 22.

[0062] According to some embodiments of this application, please refer to Figure 6 and Figure 7 The valve cover 100 has a top wall 102, a bottom wall 103 and a first side wall 101. The top wall 102 and the bottom wall 103 are arranged opposite to each other along a first direction. The first side wall 101 is constructed as a circumferential side wall located between the top wall 102 and the bottom wall 103 and arranged along the outer circumference of the two. The first direction is the thickness direction of the valve cover 100.

[0063] It should be noted that the first direction is Figure 6 and Figure 7 The Z direction is consistent with the direction from the valve body 200 to the valve cover 100 .

[0064] In the embodiment of the present application, in the direction from the valve body 200 to the valve cover 100 , the outer diameter of the valve cover 100 gradually increases, and the increasing trend may be linear or nonlinear.

[0065] In the embodiment of the present application, the valve cover 100 is a truncated cone structure, and the top wall 102 and the bottom wall 103 are both circular planes; accordingly, the valve cover 100 can also be a structure similar to a cone or other shapes, and the top wall 102 and the bottom wall 103 can also be curved surfaces or other types of surfaces.

[0066] Through the above arrangement, the outer diameter of the valve cover 100 can be gradually increased in the direction from the valve body 200 to the valve cover 100, and the circumferential side wall of the valve cover 100 is inclined outward, so that the valve cover 100 and the valve body 200 are laterally squeezed and sealed.

[0067] According to some embodiments of this application, please refer to Figure 6 and Figure 7 The valve body 200 is provided with a receiving groove 220 for accommodating the valve cover 100 , and the second side wall 201 is constructed as a circumferential side wall arranged along the inner circumference of the receiving groove 220 .

[0068] It can be understood that, when the valve cover 100 is in the first state, the valve cover 100 is accommodated in the accommodating groove 220, and the first side wall 101 abuts against the second side wall 201 to isolate the pressure relief hole 210 from the external environment; when the valve cover 100 is in the second state, the valve cover 100 is at least partially moved outside the accommodating groove 220, and the first side wall 101 is separated from the second side wall 201 to connect the pressure relief hole 210 with the external environment.

[0069] In the embodiment of the present application, the receiving groove 220 can be in various shapes, as long as the receiving groove 220 is compatible with the valve cover 100, and the depth of the receiving groove 220 is greater than or equal to the thickness of the valve cover 100, so that the valve cover 100 can be completely accommodated in the receiving groove 220.

[0070] Through the above arrangement, in the direction from the valve body 200 to the valve cover 100 , the circumferential side wall of the valve body 200 can be tilted outwards, so that a lateral extrusion seal is formed between the valve cover 100 and the valve body 200 .

[0071] According to some embodiments of this application, please refer to Figure 6 and Figure 7 The explosion-proof valve 30 further includes a first sealing member 300 , which is disposed on the valve cover 100 and / or the valve body 200 ; when the valve cover 100 is in the first state, the first sealing member 300 is sandwiched between the first side wall 101 and the second side wall 201 .

[0072] It should be noted that the first seal 300 is provided on the valve cover 100 and / or the valve body 200 , which can be understood as: only the valve cover 100 is provided with the first seal 300 , or only the valve body 200 is provided with the first seal 300 , or both the valve body 200 and the valve cover 100 are provided with the first seal 300 .

[0073] In the embodiment of the present application, the first sealing member 300 is configured as a member provided on the valve cover 100 and / or the valve body 200. When the valve cover 100 is in the first state, the first sealing member 300 is used to strengthen the seal between the first side wall 101 and the second side wall 201. The first sealing member 300 is a sealing ring, and the material of the sealing ring can be silicone, rubber or other elastic body that can undergo elastic deformation.

[0074] In the embodiment of the present application, the number of the first sealing members 300 is not limited to one. When the number of the first sealing members 300 is at least two, the first sealing members 300 may be distributed at intervals along the axial direction of the valve body 200 or the valve cover 100 .

[0075] Through the above configuration, by providing the first sealing member 300 , the sealing between the first side wall 101 and the second side wall 201 can be strengthened.

[0076] According to some embodiments of this application, please refer to Figure 6 and Figure 7 The first side wall 101 is provided with a first groove 110 , and the first sealing member 300 is confined in the first groove 110 .

[0077] In the embodiment of the present application, the first groove 110 is configured as a groove body for accommodating the first sealing member 300. The first groove 110 can be in various shapes as long as it is compatible with the first sealing member 300. For example, when the first sealing member 300 is annular, the first groove 110 is an annular groove accordingly.

[0078] In the embodiment of the present application, the number of the first grooves 110 is not limited to one. When the number of the first sealing members 300 is at least two, the number of the first grooves 110 is also at least two, and the first grooves 110 and the first sealing members 300 are arranged in a one-to-one correspondence.

[0079] Through the above configuration, by fixing the first sealing member 300 to the first side wall 101 of the valve cover 100 , the space utilization rate of the valve cover 100 can be improved.

[0080] According to some embodiments of this application, please refer to Figure 6 and Figure 7 , the first sealing member 300 is constructed as a solid structure.

[0081] In the embodiment of the present application, the first sealing member 300 may be a solid silicone ring, a solid rubber ring or other types of solid elastomers.

[0082] Through the above arrangement, when the pressure relief hole 210 is blocked, the first sealing member 300 can have a certain ability to withstand compression, so that a good sealing effect is maintained between the first side wall 101 and the second side wall 201 .

[0083] According to some embodiments of this application, please refer to Figure 6 and Figure 7 The explosion-proof valve 30 further includes an elastic member 400 , which is disposed between the valve body 200 and the valve cover 100 . The valve cover 100 is able to switch between the first state and the second state under the action of the elastic member 400 .

[0084] It should be noted that during normal use of the battery cell 22, the valve cover 100 is in the first state of blocking the pressure relief hole 210, and the elastic member 400 is in the initial state; when thermal runaway occurs inside the battery, the valve cover 100 moves under the pressure of the internal gas, and the valve cover 100 switches to the second state of opening the pressure relief hole 210, and the gas can be discharged in time through the valve body 200, and the elastic member 400 is in a stretched state. The initial state of the elastic member 400 can be a natural state or a compressed state.

[0085] In the embodiment of the present application, the elastic member 400 may be a tension spring, a compression spring or other types of elastic structures. The number of the elastic member 400 is not limited to one. When the number of the elastic member 400 is at least two, each elastic member 400 can be distributed side by side between the valve body 200 and the valve cover 100.

[0086] Through the above arrangement, the elastic member 400 can play a buffering role during the switching of the valve cover 100 between the first state and the second state; and when the valve cover 100 is in the first state of blocking the pressure relief hole 210, the valve cover 100 can be automatically aligned, thereby improving the situation where the sealing failure is caused by the inability of the valve cover 100 and the valve body 200 to cover each other.

[0087] According to some embodiments of this application, please refer to Figures 8 to 11 A first fixing column 120 is disposed on a side of the valve cover 100 facing the valve body 200 , and a first end portion 410 of the elastic member 400 is connected to the first fixing column 120 .

[0088] In an embodiment of the present application, the first end 410 of the elastic member 400 and the first fixing column 120 can be detachably connected, for example, fixed by snap-fitting, plug-in, etc.; the first end 410 of the elastic member 400 and the first fixing column 120 can also be non-detachably connected, for example, fixed by riveting, welding, etc.

[0089] In the embodiment of the present application, the number of the first fixing columns 120 is not limited to one, that is, at least two first fixing columns 120 can be provided, and each first fixing column 120 can jointly fix the first end 410 of the elastic member 400 to better fix the first end 410 of the elastic member 400.

[0090] Through the above arrangement, the first end portion 410 of the elastic member 400 can be fixed to the side of the valve cover 100 facing the valve body 200 , and the structure is simple and the design is reasonable.

[0091] According to some embodiments of this application, please refer to Fig.10 and Fig.11 The first fixed column 120 includes a connecting portion 121 and a limiting portion 122. The connecting portion 121 is arranged between the limiting portion 122 and the valve cover 100. The outer diameter of the limiting portion 122 is greater than or equal to the inner diameter of the first end portion 410 of the elastic member 400. The first end portion 410 of the elastic member 400 is sleeved on the connecting portion 121 and limited by the limiting portion 122.

[0092] It can be understood that since the outer diameter of the limiting portion 122 is greater than or equal to the inner diameter of the first end 410 of the elastic member 400, after the first end 410 of the elastic member 400 is sleeved on the connecting portion 121, the first end 410 of the elastic member 400 can be limited by the limiting portion 122, thereby reducing the probability of the first end 410 of the elastic member 400 falling off the first fixing column 120.

[0093] In the embodiment of the present application, the connecting portion 121 may be in the shape of a cylinder, an elliptical cylinder or other types of columnar structures; wherein the columnar structure may be hollow or solid.

[0094] In the embodiment of the present application, the limiting portion 122 may be in the shape of a cylinder, an elliptical cylinder or other types of columnar structures; wherein the columnar structure may be hollow or solid.

[0095] Through the above configuration, the first end 410 of the elastic member 400 is limited by the limiting portion 122 , thereby reducing the probability of the first end 410 of the elastic member 400 falling off from the first fixing column 120 .

[0096] According to some embodiments of this application, please refer to Fig.10 and Fig.11 The first fixing column 120 and the valve cover 100 are an integrated structure.

[0097] In the embodiment of the present application, the first fixing column 120 and the valve cover 100 can form an integrated structure in a variety of ways, such as integrally forming by injection molding, casting, etc., and the method of integrally forming the first fixing column 120 and the valve cover 100 is not limited here.

[0098] Through the above arrangement, the first fixing column 120 and the valve cover 100 have good integrity and high mechanical strength, which facilitates the simplification of the assembly structure.

[0099] According to some embodiments of this application, please refer to Figure 8 and Fig. 9A second fixing column 230 is disposed on a side of the valve body 200 facing the valve cover 100 , and a second end 420 of the elastic member 400 away from the valve cover 100 is connected to the second fixing column 230 .

[0100] In an embodiment of the present application, the second end 420 of the elastic member 400 and the second fixing column 230 can be connected in a detachable manner, for example, by snapping, plugging, or the like; the second end 420 of the elastic member 400 and the second fixing column 230 can also be connected in a non-detachable manner, for example, by riveting, welding, or the like.

[0101] In the embodiment of the present application, the number of the second fixing columns 230 is not limited to one, that is, at least two second fixing columns 230 can be provided, and each second fixing column 230 can jointly fix the second end 420 of the elastic member 400 to better fix the second end 420 of the elastic member 400.

[0102] Through the above arrangement, the second end portion 420 of the elastic member 400 can be fixed to the side of the valve body 200 facing the valve cover 100 , and the structure is simple and the design is reasonable.

[0103] According to some embodiments of this application, please refer to Figure 8 and Fig. 9 A notch 240 is provided on one side of the valve body 200 facing the valve cover 100 , and the second fixing column 230 is protruded from the inner periphery of the notch 240 and accommodated in the notch 240 .

[0104] In the embodiment of the present application, the notch 240 is disposed at the bottom of the valve body 200 , and the notch 240 may be semicircular, elliptical or other shapes, and the shape of the notch 240 is not limited herein.

[0105] In the embodiment of the present application, the second fixing column 230 may be in the shape of a cylinder, an elliptical column or other types of columnar structures; wherein the columnar structure may be hollow or solid.

[0106] Through the above configuration, the second fixing column 230 is protruded from the inner circumference of the notch 240 and is accommodated in the notch 240 , which can improve the space utilization of the valve body 200 .

[0107] According to some embodiments of this application, please refer to Figure 6 and Figure 7 The valve body 200 includes a main body 202 and a seat body 203. The seat body 203 is arranged on the side of the main body 202 away from the valve cover 100. The main body 202 is provided with an avoidance groove 202a for the elastic member 400 to pass through. The seat body 203 is provided with a cavity 203a for the elastic member 400 to pass through. The cavity 203a is connected to the avoidance groove 202a. The second fixing column 230 is arranged on the bottom wall 103 of the cavity 203a.

[0108] Understandably, reference Figure 6 , during the normal use of the battery cell 22, the valve cover 100 is in the first state of blocking the pressure relief hole 210, and the elastic member 400 is in the initial state; refer to Figure 7 When thermal runaway occurs inside the battery, the valve cover 100 moves under the pressure of the internal gas, and the valve cover 100 switches to the second state of opening the pressure relief hole 210, so that the gas can be discharged in time through the valve body 200, and the elastic member 400 is in a stretched state. In the process of switching between the first state and the second state of the valve cover 100, the elastic member 400 can freely expand and contract in the cavity 203a and the avoidance groove 202a.

[0109] In the embodiment of the present application, the cavity 203a is disposed inside the seat 203, the avoidance groove 202a is disposed in the middle of the main body 202, and the central axis of the avoidance groove 202a coincides with the central axis of the cavity 203a to facilitate the free movement of the elastic member 400.

[0110] In the embodiment of the present application, the cavity 203a may be a cylindrical cavity, a prismatic cavity, or a cavity of other shapes. Here, the shape of the cavity 203a is not limited.

[0111] In the embodiment of the present application, the avoidance groove 202a may be a square groove, a circular groove, or a groove body of other shapes. Here, the shape of the avoidance groove 202a is not limited.

[0112] Through the above arrangement, when the valve cover 100 switches between the first state and the second state, the elastic member 400 can freely expand and contract in the cavity 203a and the avoidance groove 202a.

[0113] According to some embodiments of this application, please refer to Figure 6 and Figure 7 The explosion-proof valve 30 further includes a second sealing member 500 . A second groove 202 b is provided on a side of the main body 202 facing away from the valve cover 100 . The second sealing member 500 is confined in the second groove 202 b .

[0114] It should be noted that, since the explosion-proof valve 30 is disposed on the end cap 23 of the battery cell 22 or the housing 24 of the battery cell 22, the side of the main body 202 away from the valve cover 100 is also the side of the explosion-proof valve 30 facing the inside of the battery cell 22. Due to the provision of the second sealing member 500, the explosion-proof valve 30 can achieve sealing performance toward the inside of the battery cell 22.

[0115] In the embodiment of the present application, the second sealing member 500 is a sealing ring, and the sealing ring can be made of silicone, rubber or other elastic body capable of elastic deformation. The number of the second sealing members 500 is not limited to one. When the number of the second sealing members 500 is at least two, each second sealing member 500 can be distributed at intervals along the axial direction of the main body 202.

[0116] In the embodiment of the present application, the second groove 202b is configured as a groove body for accommodating the second sealing member 500. The second groove 202b can be in various shapes as long as it is compatible with the second sealing member 500. For example, when the second sealing member 500 is in an annular shape, the second groove 202b is an annular groove accordingly. The number of the second grooves 202b is not limited to one. When the number of the second sealing members 500 is at least two, the number of the second grooves 202b is also at least two, and the second grooves 202b are arranged in a one-to-one correspondence with the second sealing members 500.

[0117] By the above arrangement, by fixing the second sealing member 500 to the side of the valve body 200 away from the valve cover 100 , the space utilization of the valve body 200 can be improved, and the explosion-proof valve 30 can achieve sealing performance toward the inner side of the battery cell 22 .

[0118] Please refer to Figure 2 In one embodiment, the battery device 20 includes the above-mentioned battery cell 22 .

[0119] It should be noted that the battery device 20 further includes a box body 21 , and the battery cells 22 are accommodated in the box body 21 .

[0120] In the above-mentioned battery device 20, the valve cover 100 has a first state of blocking the pressure relief hole 210 and a second state of opening the pressure relief hole 210. When the valve cover 100 is in the first state, the first side wall 101 abuts against the second side wall 201. Because the second side wall 201 and the first side wall 101 are both inclined outward in the direction from the valve body 200 to the valve cover 100, a lateral extrusion seal is formed between the second side wall 201 and the first side wall 101, which can form a better sealing effect between the valve cover 100 and the valve body 200, so that the pressure relief hole 210 is better isolated from the external environment, reducing the probability of sealing failure of the explosion-proof valve 30 in the battery cell 22.

[0121] Please refer to Figure 1 In one embodiment, the electrical equipment includes the battery device 20 described above.

[0122] In the above-mentioned electrical equipment, a good sealing effect is formed between the valve cover 100 and the valve body 200 of the battery device 20, so that the pressure relief hole 210 is better isolated from the external environment, and the probability of sealing failure of the explosion-proof valve 30 in the battery cell 22 is reduced.

[0123] According to some embodiments of the present application, see Figures 3 to 11In one embodiment, the battery cell 22 includes an explosion-proof valve 30, which includes a valve cover 100, a valve body 200, a first sealing member 300, an elastic member 400 and a second sealing member 500. The valve body 200 has a pressure relief hole 210. The elastic member 400 is connected between the valve body 200 and the valve cover 100. The valve cover 100 has a first state of blocking the pressure relief hole 210 and a second state of opening the pressure relief hole 210. The valve cover 100 can switch between the first state and the second state under the action of the elastic member 400; the valve cover The valve body 100 has a first side wall 101, which is configured as a circumferential side wall located between the top wall 102 and the bottom wall 103 and arranged along the outer periphery of the two walls; the valve body 200 has a second side wall 201, which is provided with a receiving groove 220 for accommodating the valve cover 100, and the second side wall 201 is configured as a circumferential side wall arranged along the inner periphery of the receiving groove 220; in the direction from the valve body 200 to the valve cover 100, the second side wall 201 and the first side wall 101 are both arranged to be inclined outwardly relative to the central axis of the valve body 200. The first side wall 101 is provided with a first groove 110, and the first sealing member 300 is configured as a solid structure and is limited in the first groove 110. The valve body 200 includes a main body 202 and a seat body 203. The seat body 203 is arranged on the side of the main body 202 away from the valve cover 100. The main body 202 is provided with an avoidance groove 202a for the elastic member 400 to pass through. The seat body 203 is provided with a cavity 203a for the elastic member 400 to pass through. The cavity 203a is connected to the avoidance groove 202a. The second fixing column 230 is arranged on the bottom wall 103 of the cavity 203a. The side of the main body 202 away from the valve cover 100 is provided with a second groove, and the second sealing member 500 is limited in the second groove.

[0124] Among them, a first fixing column 120 is provided on the side of the valve cover 100 facing the valve body 200, the first fixing column 120 and the valve cover 100 are an integrated structure, and the first end 410 of the elastic member 400 is connected to the first fixing column 120; a second fixing column 230 is provided on the side of the valve body 200 facing the valve cover 100, and the second end 420 of the elastic member 400 away from the valve cover 100 is connected to the second fixing column 230.

[0125] According to some embodiments of the present application, see Figure 2 In one embodiment, the battery device 20 includes the above-mentioned battery cell 22 .

[0126] According to some embodiments of the present application, see Figure 1 In one embodiment, the electrical equipment includes the battery device 20 described above.

[0127] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell (22), characterized in that: include: An explosion-proof valve (30) comprises a valve cover (100) and a valve body (200), the valve body (200) having a pressure relief hole (210), the valve cover (100) being movably connected to the valve body (200), and the valve cover (100) having a first state of blocking the pressure relief hole (210) and a second state of opening the pressure relief hole (210); The valve cover (100) has a first side wall (101), and the valve body (200) has a second side wall (201); in a direction from the valve body (200) to the valve cover (100), the second side wall (201) and the first side wall (101) are both arranged to be inclined outwards relative to a central axis of the valve body (200); when the valve cover (100) is in the first state, the first side wall (101) abuts against the second side wall (201) so that the pressure relief hole (210) is isolated from the external environment; when the valve cover (100) is in the second state, the first side wall (101) and the second side wall (201) are separated; a first sealing member (300), the first sealing member (300) being arranged on the valve cover (100) and / or the valve body (200); When the valve cover (100) is in the first state, the first sealing member (300) is sandwiched between the first side wall (101) and the second side wall (201).

2. The battery cell (22) according to claim 1, characterized in that: The valve cover (100) comprises a top wall (102), a bottom wall (103) and the first side wall (101); the top wall (102) and the bottom wall (103) are arranged opposite to each other along a first direction; the first side wall (101) is constructed as a circumferential side wall located between the top wall (102) and the bottom wall (103) and arranged along the periphery of the two walls; the first direction is the thickness direction of the valve cover (100).

3. The battery cell (22) according to claim 1, characterized in that: The valve body (200) is provided with a receiving groove (220) for receiving the valve cover (100), and the second side wall (201) is configured as a circumferential side wall arranged along the inner circumference of the receiving groove (220).

4. The battery cell (22) according to claim 1, characterized in that: The first side wall (101) is provided with a first groove (110), and the first sealing component (300) is confined in the first groove (110).

5. The battery cell (22) according to claim 1, characterized in that: The first sealing member (300) is constructed as a solid structure.

6. The battery cell (22) according to claim 1, characterized in that: The explosion-proof valve (30) further comprises an elastic member (400), wherein the elastic member (400) is arranged between the valve body (200) and the valve cover (100), and the valve cover (100) is capable of switching between the first state and the second state under the action of the elastic member (400).

7. The battery cell (22) according to claim 6, characterized in that: A first fixing column (120) is provided on a side of the valve cover (100) facing the valve body (200), and a first end portion (410) of the elastic member (400) is connected to the first fixing column (120).

8. The battery cell (22) according to claim 7, characterized in that: The first fixing column (120) comprises a connecting portion (121) and a limiting portion (122); the connecting portion (121) is arranged between the limiting portion (122) and the valve cover (100); the outer diameter of the limiting portion (122) is greater than or equal to the inner diameter of the first end portion (410) of the elastic member (400); the first end portion (410) of the elastic member (400) is sleeved on the connecting portion (121) and limited by the limiting portion (122).

9. The battery cell (22) according to claim 7, characterized in that: The first fixing column (120) and the valve cover (100) are an integrated structure.

10. The battery cell (22) according to claim 6, characterized in that: A second fixing column (230) is provided on a side of the valve body (200) facing the valve cover (100), and a second end portion (420) of the elastic member (400) away from the valve cover (100) is connected to the second fixing column (230).

11. The battery cell (22) according to claim 10, characterized in that: A notch (240) is provided on a side of the valve body (200) facing the valve cover (100), and the second fixing column (230) is protruding from the inner periphery of the notch (240) and is accommodated in the notch (240).

12. The battery cell (22) according to claim 10, characterized in that: The valve body (200) comprises a main body (202) and a seat body (203); the seat body (203) is arranged on a side of the main body (202) away from the valve cover (100); the main body (202) is provided with an avoidance groove (202a) for the elastic member (400) to pass through; the seat body (203) is provided with a cavity (203a) for the elastic member (400) to pass through; the cavity (203a) is connected to the avoidance groove (202a); and the second fixing column (230) is arranged on the bottom wall (103) of the cavity (203a).

13. The battery cell (22) according to claim 12, characterized in that: The explosion-proof valve (30) further comprises a second sealing member (500); a second groove (202b) is provided on a side of the main body (202) facing away from the valve cover (100); and the second sealing member (500) is confined in the second groove (202b).

14. A battery device (20), characterized in that: Comprising a battery cell (22) as claimed in any one of claims 1 to 13.

15. An electrical equipment, characterized in that: Comprising the battery device (20) as claimed in claim 14.

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