Explosion-proof valve assembly, battery cell, battery and electrical device

Abstract

The present application belongs to the field of battery technology, and provides an explosion-proof valve assembly, a battery cell, a battery and an electrical device, wherein the explosion-proof valve assembly includes a bracket and an explosion-proof plate; the bracket includes a first structural member and a second structural member, the first structural member has a first thickness extending along a preset direction, the first structural member has a first end face and a second end face arranged opposite to each other along a preset direction, the first structural member is provided with a channel passing through the first end face and the second end face, the second structural member is convexly connected to the outer side surface of the first structural member, the second structural member has a second thickness extending along a preset direction, and the second thickness is less than the first thickness; the explosion-proof plate is connected to the first structural member and covers the channel. The present application aims to solve the technical problem that the bursting pressure of the explosion-proof valve assembly is easily affected by the deformation of the battery shell.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to an explosion-proof valve assembly, a battery cell, a battery and an electrical device. Background Art

[0002] The explosion-proof valve of the battery is an explosion-proof device designed for battery systems. In batteries, especially in high-energy-density batteries such as lithium batteries, abnormal conditions may occur, such as overcharging, over-discharging, over-temperature, etc. These conditions may cause the battery to produce excessive gas or vapor, increasing the risk of explosion. The role of the explosion-proof valve is to monitor the pressure inside the battery and release gas when the pressure exceeds the use range to prevent the battery system from exploding.

[0003] In the related art, the explosion-proof valve is integrally formed on the battery casing. When the casing is deformed, it will affect the bursting pressure of the explosion-proof valve thereon, which may cause the explosion-proof valve to fail to open in time when the system pressure exceeds the operating range, thereby increasing the risk of battery explosion. Utility Model Content

[0004] The purpose of the present application is to provide an explosion-proof valve assembly, a battery cell, a battery and an electrical device, aiming to solve the technical problem that the bursting pressure of the explosion-proof valve assembly is easily affected by the deformation of the battery casing.

[0005] In a first aspect, the present application provides an explosion-proof valve assembly, comprising:

[0006] A bracket, comprising a first structural member and a second structural member, wherein the first structural member has a first thickness extending along a preset direction, the first structural member has a first end face and a second end face arranged opposite to each other along the preset direction, the first structural member is provided with a passage passing through the first end face and the second end face, the second structural member is convexly arranged on an outer side surface of the first structural member, the second structural member has a second thickness extending along the preset direction, and the second thickness is less than the first thickness;

[0007] The explosion-proof plate is connected to the first structural member and covers the passage.

[0008] In this example, a bracket is provided so that the bracket includes a first structural member and a second structural member. The second structural member is convexly connected to the outer side surface of the first structural member so as to be connected to the outer shell of the battery. The explosion-proof plate is installed on the first structural member so that the thickness of the first structural member is greater than the thickness of the second structural member. The second structural member is used to be directly connected to the outer shell, so that the stress generated by the deformation of the outer shell is absorbed and transmitted by the second structural member, and the stress transmitted to the first structural member is reduced. The first structural member further absorbs the stress, thereby further reducing the stress transmitted to the explosion-proof plate and reducing the influence of external force on the explosion-proof plate, thereby ensuring that the bursting pressure of the explosion-proof plate remains unchanged and the stable performance of the battery is ensured.

[0009] In one embodiment, the second structural member is continuous and is arranged around the preset direction on the outer side of the first structural member.

[0010] In this example, the second structural member forms a continuous, uninterrupted annular structure in the circumferential direction of the first structural member, and the upper surface or lower surface of the second structural member can be directly connected to the outer shell, for example, by welding. The continuous second structural member can increase its contact area with the outer shell, improve the connection strength, ensure the firmness of the connection between the second structural member and the outer shell, and improve the stability of the connection between the bracket and the outer shell.

[0011] In one embodiment, the second structural member includes a plurality of sub-second structural members, and the plurality of sub-second structural members are arranged around the outer side surface of the first structural member at intervals around the preset direction; each of the sub-second structural members has the second thickness along the preset direction.

[0012] In this example, the second structural member adopts a split structure, and a plurality of independently configured sub-second structural members are spaced around the circumference of the first structural member, so that the overall structure of the second structural member is more flexible and can be applied to situations where the connecting surface of the outer shell is a plane or a non-plane. Each sub-second structural member can be staggered to connect with the surface of an irregularly shaped outer shell, and the second structural member is more applicable and flexible.

[0013] In one embodiment, the second thickness of each of the sub-second structural members is the same; or, among the sub-second structural members, at least two of the sub-second structural members have unequal values ​​of the second thickness.

[0014] In this example, each sub-second structural member is an independent structural member. Therefore, the numerical value of the second thickness of each sub-second structural member may be equal or not completely equal, so that the setting of each sub-second structural member is more flexible. The second thickness of each sub-second structural member can be adaptively changed according to the shape and thickness of the connection position of the outer shell to achieve flexible assembly.

[0015] In one embodiment, along the preset direction, the second structural member has a first surface and a second surface, and the first surface is flush with the first end surface; or, the second surface is flush with the second end surface; or, the second structural member is configured between the first end surface and the second end surface.

[0016] In this example, along the preset direction, the second structural member has a variety of positional relationships with the first structural member, and can form a coplanar structure with the first end face or the second end face of the first structural member, so that the overall bracket is easier to process; the second structural member can also be located in the middle area of ​​the thickness of the first structural member to improve the positioning and connection effects of the second structural member.

[0017] In one embodiment, an internal thread structure or an external thread structure is formed on the second structural member.

[0018] In this example, the second structural member is the main component used to connect with other components. The second structural member is threadedly connected to other components through an internal thread structure or an external thread structure arranged thereon. The threaded connection makes the installation and disassembly of the explosion-proof valve assembly more convenient, easy to maintain, and the connection is firm and reliable.

[0019] In one embodiment, at least one of the first structural member and the second structural member is a structural member made of metal material.

[0020] In this example, the explosion-proof plate is installed on the bracket, and at least one of the first structural member and the second structural member in the bracket is made of metal material, so that the bracket has higher strength, hardness and deformation resistance, and the bracket is not easy to deform or the deformation amplitude is reduced, so that the explosion-proof plate installed thereon is not easily affected by the deformation of the bracket and is not easy to deform. The explosion-proof plate does not deform or the deformation amplitude is extremely small, and the bursting pressure of the explosion-proof plate does not change or changes very little, which can ensure the normal use of the explosion-proof plate and ensure the stable performance of the battery.

[0021] In one embodiment, the metal material includes copper, aluminum, steel and alloys thereof.

[0022] In this example, the bracket has at least structural parts made of copper, aluminum, steel and their alloys, which can improve the thermal conductivity, plasticity and corrosion resistance of the bracket itself, and can enhance the supporting effect on the explosion-proof plate installed on the bracket, ensure the stability of the installation of the explosion-proof valve assembly, and protect the explosion-proof valve assembly.

[0023] In one embodiment, the second thickness ranges from 1 mm to 4 mm, and the first thickness is 4 to 6 times the second thickness.

[0024] In this example, there is a 4-6 times thickness difference between the first structural member and the second structural member, which makes the shoulder structure formed at the connection position of the first structural member and the second structural member more obvious. While ensuring the connection strength of the second structural member, a sufficient thickness difference is ensured, so that when the bracket is connected to the shell, it can ensure sufficient anti-deformation ability while also having sufficient supporting strength. Moreover, by setting the difference between the first thickness and the second thickness, a shoulder structure is formed, which is beneficial to blocking the stress from being transmitted to the first structural member and protecting the explosion-proof plate.

[0025] In one embodiment, the outer contour of the cross section of the first structural member perpendicular to the preset direction is in the shape of a circle, an ellipse, a polygon, or a closed ring formed by a combination of an arc and a straight line.

[0026] In this example, the outer contour of the cross section of the first structural member is formed into a regular pattern, which is beneficial to the processing of the stent and improves the preparation efficiency of the stent.

[0027] In one embodiment, the explosion-proof valve assembly further includes a protection sheet, which is connected to the first structural member and covers the channel, and the protection sheet is disposed at the explosion outlet end of the explosion-proof sheet.

[0028] In this example, the protective sheet can protect the explosion-proof disc. The protective sheet is used to cover and protect the weak area of ​​the explosion-proof disc. The protective sheet can also prevent dust, debris, moisture and other external substances from entering the interior of the explosion-proof valve assembly and affecting the normal operation and sealing performance of the valve.

[0029] In one embodiment, along the preset direction, the explosion-proof plate is connected to the first end surface, and the protection plate is connected to the second end surface.

[0030] In this example, the explosion-proof plate and the protective plate are respectively arranged on the two end surfaces of the first structure, so that the protective plate can cover and protect the explosion-proof plate. In addition, the explosion-proof plate and the protective plate are arranged relative to each other, which is conducive to adjusting and increasing the bursting pressure of the explosion-proof valve assembly, thereby realizing the adjustable design of the pressure of the explosion-proof valve assembly.

[0031] In one of the embodiments, a groove is formed on the first end surface, the groove is connected to the channel, and the explosion-proof disk is connected to the groove.

[0032] In this example, the explosion-proof piece is installed in a groove on the first end face of the first structural member. The groove wall of the groove can position and limit the explosion-proof piece. By controlling the depth of the groove, after the explosion-proof piece is installed in the groove, it can be misaligned with the second structural member in a preset direction, thereby forming an obstacle when stress is transmitted from the second structural member to the explosion-proof piece, which is beneficial to reduce the stress transmitted to the explosion-proof piece and reduce the risk of deformation of the explosion-proof piece.

[0033] In a second aspect, the present application provides a battery cell, which includes a shell, a battery cell and the explosion-proof valve assembly in the above embodiment, the shell has a accommodating space, the battery cell is accommodated in the accommodating space, and the second structural member is connected to the shell.

[0034] In one embodiment, the housing includes a first shell and a second shell, the first shell and the second shell are detachably connected to jointly enclose a containing space, and the explosion-proof valve assembly is connected to the first shell or the second shell.

[0035] In this example, the shell adopts a split structure, and the explosion-proof valve assembly can be installed on any first shell or second shell. The first shell and the second shell are detachably connected, so as to facilitate the installation and disassembly of the explosion-proof valve assembly and facilitate maintenance; in addition, the split shell can also hinder the transmission of stress when deformation occurs, which is beneficial to reduce the influence of stress on the explosion-proof plate.

[0036] In a third aspect, the present application provides a battery, which includes the explosion-proof valve assembly in the above embodiment, or includes the battery cell in the above embodiment.

[0037] In a fourth aspect, the present application provides an electrical device, which includes the explosion-proof valve assembly or battery cell or battery in the above-mentioned embodiment, and the battery is used to provide electrical energy.

[0038] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0040] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0041] Figure 2 A schematic diagram of the exploded structure of a battery provided in some embodiments of the present application;

[0042] Figure 3 Schematic diagram of the structure of the explosion-proof valve assembly of some embodiments of the present application Figure 1 ;

[0043] Figure 4 for Figure 3 Schematic diagram of the structure of the middle bracket Figure 1 ;

[0044] Figure 5 for Figure 3 Schematic diagram of the structure of the middle bracket Figure 2 ;

[0045] Figure 6 for Figure 4 A top view of

[0046] Figure 7 A cross-sectional view of an explosion-proof valve assembly according to some embodiments of the present application Figure 1 ;

[0047] Figure 8 A cross-sectional view of an explosion-proof valve assembly according to some embodiments of the present application Figure 2 ;

[0048] Fig. 9 A cross-sectional view of an explosion-proof valve assembly according to some embodiments of the present application Figure 3 ;

[0049] Fig.10 for Figure 3 Schematic diagram of the structure of the middle explosion-proof disk;

[0050] Fig.11 Schematic diagram of the structure of the explosion-proof valve assembly of some embodiments of the present application Figure 2 ;

[0051] Fig.12 for Fig.11 Schematic diagram of the decomposition structure;

[0052] Fig.13 for Fig.11 A cross-sectional view of

[0053] Fig.14 A schematic diagram of the structure of a battery cell provided in some embodiments of the present application;

[0054] Fig.15 A schematic structural diagram of the connection between the explosion-proof valve assembly and the second shell in a battery cell provided in some embodiments of the present application.

[0055] Description of reference numerals:

[0056] 1000, vehicle; 100, battery; 10, housing; 11, first part; 12, second part; 20, battery cell; 21, explosion-proof valve assembly; 211, bracket; 2111, first structural member; 21111, channel; 21112, first end face; 21113, second end face; 21114, groove; 2112, second structural member; 21121, first surface; 21122, second surface; 21123, external thread structure; 2113, sub-second structural member; 212, explosion-proof disk; 2121, weak area; 213, protective sheet; 22, outer shell; 221, first shell; 222, second shell; 23, battery cell; X, preset direction; L1, first thickness; L2, second thickness; 200, controller; 300, motor. DETAILED DESCRIPTION

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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).

[0063] 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.

[0064] 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.

[0065] The explosion-proof valve of the battery is an explosion-proof device designed for the battery system. The explosion-proof valve can also be called an explosion-proof valve assembly. In batteries, especially in high-energy-density batteries such as lithium batteries, abnormal conditions may occur, such as overcharging, over-discharging, over-temperature, etc. These conditions may cause the battery to produce excessive gas or vapor, increasing the risk of explosion. The role of the explosion-proof valve is to monitor the pressure inside the battery and release gas when the pressure exceeds the use range to prevent the battery system from exploding.

[0066] In the related art, a battery has an outer shell, the interior of the outer shell has an accommodating space capable of accommodating a battery cell, and an explosion-proof valve is integrally formed on the outer shell of the battery; due to the influence of the external environment, for example, external squeezing force, etc., the outer shell is prone to deformation. When the outer shell is deformed, since the explosion-proof valve is integrally formed with the outer shell, the deformation of the outer shell will inevitably affect the force on the explosion-proof valve, and further affect the bursting pressure of the explosion-proof valve, and the preset bursting pressure of the explosion-proof valve will change. For example, if the preset bursting pressure of the explosion-proof valve increases, it may cause the explosion-proof valve to fail to open in time when the system pressure exceeds the use range, thereby increasing the risk of battery explosion. For another example, when the preset bursting pressure of the explosion-proof valve decreases, the pressure of the battery system has not exceeded the preset pressure range, and the explosion-proof valve will open, affecting the normal use of the battery.

[0067] Therefore, the present application provides an explosion-proof valve assembly, which can reduce the stress effect of the shell on the explosion-proof valve assembly, thereby reducing the effect of shell deformation on the bursting pressure of the explosion-proof valve assembly, which is beneficial to improving the reliability of the battery during use.

[0068] Specifically, the first aspect of the embodiment of the present application provides an explosion-proof valve assembly 21, which can be applied to a battery cell 20 and can be installed on a housing 22 of the battery cell 20. The battery cell 20 disclosed in the embodiment of the present application can be used in an electrical device that uses a battery 100 as a power source or various energy storage systems that use a battery 100 as an energy storage element. The electrical device can 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, and the like. Among them, the electric toy can include fixed or mobile electric toys, for example, game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like, and the spacecraft can include airplanes, rockets, space shuttles, and spacecrafts, and the like.

[0069] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0070] Please refer to Figure 1 , Figure 1A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0071] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0072] Please refer to Figure 2 , Figure 2 An exploded view of a battery 100 provided in some embodiments of the present application. The battery 100 includes a box 10 and a battery cell 20, and the battery cell 20 is contained in the box 10. Among them, the box 10 is used to provide a storage space for the battery cell 20, and the box 10 can adopt a variety of structures. In some embodiments, the box 10 may include a first part 11 and a second part 12, the first part 11 and the second part 12 cover each other, and the first part 11 and the second part 12 jointly define a storage space for accommodating the battery cell 20. The second part 12 may be a hollow structure with one end open, the first part 11 may be a plate-like structure, and the first part 11 covers the open side of the second part 12, so that the first part 11 and the second part 12 jointly define a storage space; the first part 11 and the second part 12 may also be hollow structures with one side open, and the open side of the first part 11 covers the open side of the second part 12. Of course, the box 10 formed by the first part 11 and the second part 12 may be in a variety of shapes, such as a cylinder, a cuboid, etc.

[0073] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the box 10; of course, the battery 100 may also be a battery module formed by connecting multiple battery cells 20 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 10. The battery 100 may also include other structures, for example, the battery 100 may also include a busbar component for realizing electrical connection between the multiple battery cells 20.

[0074] The battery cell 20 refers to the smallest unit that constitutes the battery. Each battery cell 20 may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular or in other shapes.

[0075] The battery cells 20 are each equipped with an explosion-proof valve assembly 21. According to some embodiments of the present application, Figure 3 , Figure 4 , Figure 7 and Figure 8 , Figure 3 This is a schematic diagram of the structure of the explosion-proof valve assembly 21 provided in some embodiments of the present application, and please refer to Figure 4 , Figure 4 for Figure 3 Schematic diagram of the structure of the middle bracket 211. The embodiment of the present application provides an explosion-proof valve assembly 21, which includes a bracket 211 and an explosion-proof disk 212; the bracket 211 includes a first structural member 2111 and a second structural member 2112, the first structural member 2111 has a first thickness L1 extending along a preset direction X, the first structural member 2111 has a first end face 21112 and a second end face 21113 arranged opposite to each other along the preset direction X, the first structural member 2111 is provided with a channel 21111 penetrating the first end face 21112 and the second end face 21113, the second structural member 2112 is convexly connected to the outer side surface of the first structural member 2111, the second structural member 2112 has a second thickness L2 extending along the preset direction X, and the second thickness L2 is less than the first thickness L1; the explosion-proof disk 212 is connected to the first structural member 2111 and covers the channel 21111.

[0076] Specifically, combined Figure 5-7As shown, the first structural member 2111 is extended along the preset direction X, and extends the first thickness L1 along the preset direction X, so that the first structural member 2111 is columnar or sheet-shaped. When the outer diameter of the first structural member 2111 in a direction perpendicular to the preset direction X is smaller than the thickness in the preset direction X, the thickness of the first structural member 2111 can also be understood as the height, and the preset direction X is the thickness direction or height direction of the first structural member 2111; it can be understood that the first structural member 2111 has two end faces at both ends of the preset direction X, and the two end faces can be respectively defined as a first end face 21112 and a second end face 21113, and the first end face 21112 and the second end face 21113 can be a plane, a curved surface or a combination of surfaces of any shape, etc.

[0077] A channel 21111 is formed inside the first structural member 2111. The channel 21111 passes through the first end face 21112 and the second end face 21113. The channel 21111 can also be understood as a through hole passing through the first end face 21112 and the second end face 21113. The central axis of the through hole can be a straight line, a curve, or a broken line. When the central axis of the through hole is a straight line, the axis can be parallel to the preset direction X or be set at an angle to the preset direction X. The angle ranges from 0° to 90°, excluding 90°.

[0078] Channel 21111 is used for circulating gas, and explosion-proof plate 212 needs to be installed inside channel 21111 or at the port of channel 21111. Explosion-proof plate 212 can cover the inside of channel 21111 or the port of channel 21111, wherein the port of channel 21111 may include a channel entrance and a channel exit, and a weak area 2121 is formed in the middle of explosion-proof plate 212; during the charging and discharging process of battery 100, gas is generated inside thereof, and when the gas enters channel 21111 and reaches a preset explosion-proof pressure inside channel 21111, since a weak area 2121 is formed in the middle of explosion-proof plate 212, the gas will break through the weak area 2121, thereby opening the explosion-proof valve assembly 21, and releasing the gas to the external space through the explosion-proof valve assembly 21.

[0079] The second structural member 2112 is connected to the first structural member 2111, and the second structural member 2112 protrudes from the outer side surface of the first structural member 2111, wherein the outer side surface of the first structural member 2111 refers to the circumferential outer surface of the first structural member 2111 located between the first end surface 21112 and the second end surface 21113. For example, when the first structural member 2111 is a cylindrical structure, the outer side surface refers to the outer cylindrical surface of the cylindrical structure, that is, the second structural member 2112 protrudes outward from the outer side surface of the first structural member 2111 toward a direction away from the side surface and extends a preset width. For example, the second structural member 2112 is a circular ring body arranged on the outer side surface of the first structural member 2111; the second structural member 2112 has a second thickness L2 in the preset direction X, so it can be known that the second structural member 2112 can be in the form of a sheet or a plate.

[0080] In the present application, the second thickness L2 of the second structural member 2112 is made smaller than the first thickness L1 of the first structural member 2111. For example, the second thickness L2 is equal to about 20% of the first thickness L1, or the first thickness L1 is equal to about 5 times the second thickness L2, so that the second structural member 2112 and the first structural member 2111 form a shoulder structure or a shoulder shape at the connection position. The shoulder structure is more conducive to blocking stress transfer, and the effect of blocking stress transfer from thinner areas to thicker areas is obvious.

[0081] The explosion-proof valve assembly 21 is used to be installed on the shell 22 of the battery 100. Specifically, the second structural member 2112 is directly connected to the shell 22, while the first structural member 2111 is not directly connected to the shell 22. The second structural member 2112 and the shell 22 can be fixedly connected or detachably connected. The fixed connection method includes welding, interference fit, etc., and the detachable connection method includes threaded connection, snap connection, etc. A sealing member can be added to the connection position to reduce the occurrence of air leakage and enhance the sealing effect.

[0082] When the shell 22 is deformed, stress is generated at the connection position between the shell 22 and the bracket 211. Since the second structural member 2112 is directly connected to the shell 22, the stress directly acts on the second structural member 2112, and the second structural member 2112 absorbs and transmits the stress. The second structural member 2112 can absorb more stress. Since the second thickness L2 of the second structural member 2112 is less than the first thickness L1 of the first structural member 2111, it can be seen that a shoulder lift structure is formed between the second structural member 2112 and the first structural member 2111. After the second structural member 2112 absorbs the stress, the stress transmitted to the first structural member 2111 is weakened and attenuated. Since the first structural member 2111 is thicker, the first structural member 2111 itself is not easy to deform, or the deformation amount is relatively reduced. Since the explosion-proof plate 212 is installed on the first structural member 2111, it can be known that the external force has little effect on the explosion-proof plate 212 and will hardly affect the deformation of the explosion-proof plate 212, thereby reducing the impact on the bursting pressure of the explosion-proof plate 212, and further reducing the impact on the performance of the battery 100.

[0083] In this example, by setting a bracket 211, the bracket 211 includes a first structural member 2111 and a second structural member 2112. The second structural member 2112 is convexly connected to the outer side of the first structural member 2111 so as to be connected to the outer shell 22 of the battery 100. The explosion-proof plate 212 is installed on the first structural member 2111 so that the thickness of the first structural member 2111 is greater than the thickness of the second structural member 2112. The second structural member 2112 is used to be directly connected to the outer shell 22, so that the stress generated by the deformation of the outer shell 22 is absorbed and transmitted by the second structural member 2112, and the stress transmitted to the first structural member 2111 is reduced. The first structural member 2111 further absorbs the stress, thereby further reducing the stress transmitted to the explosion-proof plate 212 and reducing the influence of external force on the explosion-proof plate 212, thereby ensuring that the bursting pressure of the explosion-proof plate 212 remains unchanged and the performance of the battery 100 is stable.

[0084] In some examples, the second structural member 2112 is fixedly connected or detachably connected to the first structural member 2111, wherein the fixed connection method includes welding, interference connection or integral molding; the detachable connection method includes threaded connection, snap connection, etc. In the case of a detachable connection, the connection position between the second structural member 2112 and the first structural member 2111 needs to be sealed, for example, by adding a seal.

[0085] In this example, the first structural member 2111 and the second structural member 2112 can form an integral structure or can be independent components. The use of an integral structure can improve the stability of the overall structure of the bracket 211 and facilitate processing; the first structural member 2111 and the second structural member 2112 are both independent components, which can be easily repaired and replaced.

[0086] In some examples, combined Figure 4 As shown, the second structural member 2112 is continuous and is arranged around the outer side of the first structural member 2111 around a preset direction X. It can be seen that the second structural member 2112 is arranged around the outer periphery of the first structural member 2111 to form an annular sheet, and the upper surface or the lower surface of the second structural member 2112 is a connecting surface for connecting to the outer shell 22.

[0087] In this example, the second structural member 2112 forms a continuous, uninterrupted annular structure around the first structural member 2111. The upper surface or lower surface of the second structural member 2112 can be directly connected to the outer shell 22, for example, by welding. The continuous second structural member 2112 can increase its contact area with the outer shell 22, improve the connection strength, ensure the firmness of the connection between the second structural member 2112 and the outer shell 22, and improve the stability of the connection between the bracket 211 and the outer shell 22.

[0088] In some examples, combined Figure 5 As shown, the second structural member 2112 includes a plurality of sub-second structural members 2113, each of which is protrudingly connected to the first structural member 2111, and the plurality of sub-second structural members 2113 are arranged at intervals around the preset direction X on the outer side surface of the first structural member 2111, and each sub-second structural member 2113 has a second thickness L2 along the preset direction X.

[0089] Specifically, the second structural member 2112 is discontinuous, and the second structural member 2112 has a plurality of sub-second structural members 2113, each of which has a second thickness L2; ​​when the bracket 211 is connected to the shell 22, each of the sub-second structural members 2113 needs to be connected to the shell 22; the plurality of sub-second structural members 2113 can be located in the same plane or in different planes perpendicular to the preset direction X, and can be adaptively arranged according to the specific shape of the shell 22, for example, in combination with Figure 3 As shown, each sub-second structure member 2113 is in a sheet shape, and the plurality of sub-second structure members 2113 are located in the same plane perpendicular to the preset direction X.

[0090] In this example, the second structural member 2112 adopts a split structure, and a plurality of independently configured sub-second structural members 2113 are spaced around the circumference of the first structural member 2111, so that the overall structure of the second structural member 2112 is more flexible and can be applied to situations where the connecting surface of the outer shell 22 is flat or non-flat. Each sub-second structural member 2113 can be staggered to connect with the surface of the outer shell 22 of an irregular shape. The second structural member 2112 is more applicable and flexible.

[0091] In some examples, the second thickness L2 of each sub-second structure member 2113 is the same; or, among the sub-second structure members 2113 , at least two sub-second structure members 2113 have unequal values ​​of the second thickness L2.

[0092] Specifically, in one case, the values ​​of the second thicknesses L2 formed by extending each sub-second structural member 2113 in the preset direction X are equal, and each sub-second structural member 2113 is in the same plane perpendicular to the preset direction X; in another case, the second thicknesses L2 formed by extending each sub-second structural member 2113 in the preset direction X are not completely the same, that is, the values ​​of the second thicknesses L2 of at least two sub-second structural members 2113 are not equal, so that multiple sub-second structural members 2113 are staggered along the preset direction X. This case is applicable to the case where the surface of the shell connected to it is stepped or ladder-shaped.

[0093] In this example, each sub-second structural member 2113 is an independent structural member. Therefore, the value of the second thickness L2 of each sub-second structural member 2113 may be equal or not completely equal, so that the setting of each sub-second structural member 2113 is more flexible. The second thickness L2 of each sub-second structural member 2113 can be adaptively changed according to the shape and thickness of the connection position of the outer shell to achieve flexible assembly.

[0094] In some examples, combined Figure 7-9 As shown, along the preset direction X, the second structural member 2112 has a first surface 21121 and a second surface 21122, and the first surface 21121 is flush with the first end face 21112; or, the second surface 21122 is flush with the second end face 21113; or, the second structural member 2112 is configured between the first end face 21112 and the second end face 21113; the first surface 21121 and the second surface 21122 can be planes, curved surfaces or special-shaped combination surfaces, and the first surface 21121 or the second surface 21122 can be used to fit with the outer shell 22, and the fitting position can be fixed by welding.

[0095] Specifically, the second structural member 2112 extends a second thickness L2 along the preset direction X. It can be seen that the second structural member 2112 has two surfaces arranged opposite to each other, which are defined as a first surface 21121 and a second surface 21122. The surface close to the first end face 21112 is the first surface 21121, and the surface close to the second end face 21113 is the second surface 21122.

[0096] In one example, reference Figure 7As shown, the first surface 21121 is flush with the first end surface 21112, that is, the first surface 21121 and the second end surface 21113 are coplanar. The flush design makes the overall consistency of the exterior of the bracket 211 better and makes the manufacturing process of the bracket 211 more convenient.

[0097] Alternatively, in another example, referring to Figure 8 As shown, the second surface 21122 is flush with the second end surface 21113, that is, the second surface 21122 is coplanar with the second end surface 21113. Similarly, the flush design makes the overall consistency of the exterior of the bracket 211 better and makes the manufacturing process of the bracket 211 more convenient.

[0098] Alternatively, in another example, referring to Fig. 9 As shown, the second structural member 2112 is disposed between the first end face 21112 and the second end face 21113, that is, the first surface 21121 and the second surface 21122 on the second structural member 2112 are both located in the region between the first end face 21112 and the second end face 21113. The second structural member 2112 is located between the first end face 21112 and the second end face 21113. It can be seen that along the preset direction X, the first end face 21112 and the second end face 21113 are both convex outside the first structural member 2111, so that the first end face 21112 and the second end face 21113 are more convenient to connect with other components, for example, the first end face 21112 can be connected with the protective sheet 213, and the second end face 21113 can be connected with the explosion-proof sheet 212, etc., so that the connection positioning is more accurate.

[0099] In this example, along the preset direction X, the second structural member 2112 has a variety of positional relationships with the first structural member 2111, and can form a coplanar structure with the first end face 21112 or the second end face 21113 of the first structural member 2111, so that the overall structure of the bracket 211 is easier to process; the second structural member 2112 can also be located in the middle area of ​​the thickness of the first structural member 2111, thereby improving the positioning and connection effects of the second structural member 2112.

[0100] In some examples, combined Figure 7 As shown, an internal thread structure or an external thread structure 21123 is formed on the second structural member 2112 .

[0101] Specifically, the second structural member 2112 is used to connect with other components. For example, the other components include the outer shell 22. Taking the outer shell 22 as an example, the second structural member 2112 is connected to the outer shell 22 through a threaded structure. An internal thread structure can be formed on the second structural member 2112. Correspondingly, an external thread structure 21123 is formed on the outer shell 22. The internal thread structure on the second structural member 2112 is threadedly connected to the external thread structure 21123 on the outer shell 22; optionally, an external thread structure 21123 can be formed on the second structural member 2112. Correspondingly, an internal thread structure is formed on the outer shell 22. The external thread structure 21123 on the second structural member 2112 is threadedly connected to the internal thread structure on the outer shell 22.

[0102] In this example, the second structural member 2112 is a main component used to connect with other components. The second structural member 2112 is threadedly connected to other components through an internal thread structure or an external thread structure 21123 arranged thereon. The threaded connection makes the installation and disassembly of the explosion-proof valve assembly 21 more convenient, easy to maintain, and the connection is firm and reliable.

[0103] In some examples, at least one of the first structural member 2111 and the second structural member 2112 is a structural member made of metal material.

[0104] The first structural member 2111 may be a structural member made of metal material, or the second structural member 2112 may be a structural member made of metal material, or both the first structural member 2111 and the second structural member 2112 may be structural members made of metal material, that is, the entire bracket 211 is a structural member made of metal material. Metal materials have high strength and deformation resistance, so that the bracket 211 can withstand greater stress without damage, and the bracket 211 is not easily deformed after being subjected to external force.

[0105] In this example, the explosion-proof plate 212 is installed on the bracket 211, and at least one of the first structural member 2111 and the second structural member 2112 in the bracket 211 is made of metal material, so that the bracket 211 has higher strength, hardness and deformation resistance. The bracket 211 is not easy to deform or the deformation amplitude is reduced, so that the explosion-proof plate 212 installed thereon is not easily affected by the deformation of the bracket 211 and is not easy to deform. The explosion-proof plate 212 does not deform or the deformation amplitude is extremely small, and the bursting pressure of the explosion-proof plate 212 does not change or changes very little, which can ensure the normal use of the explosion-proof plate 212 and ensure the stable performance of the battery 100.

[0106] In some examples, the metal material includes copper, aluminum, steel and their alloys, that is, the first structural member 2111 is a structural member made of one of the materials selected from copper, aluminum, steel and their alloys; or, the second structural member 2112 is a structural member made of one of the materials selected from copper, aluminum, steel and their alloys; or, the first structural member 2111 and the second structural member 2112 are both structural members made of one of the materials selected from copper, aluminum, steel and their alloys.

[0107] Among them, copper material has the advantages of good thermal conductivity, plasticity and corrosion resistance. Good thermal conductivity can improve the diffusion of heat around the explosion-proof plate 212 and reduce heat accumulation. Copper material also has a certain plasticity, can absorb stress and reduce the impact of stress on the explosion-proof plate 212. In addition, the copper bracket 211 can also withstand the corrosion of the electrolyte; in addition to having the advantages of good thermal conductivity, plasticity and corrosion resistance and the above effects, aluminum is also a lightweight metal that can reduce the load of the outer shell 22 at the installation position and contribute to the lightweight of the battery 100; in addition to having the advantages of good thermal conductivity, plasticity and corrosion resistance and the above effects, steel material has more stable physical and chemical properties and can provide more stability and support for the explosion-proof plate 212.

[0108] Alloy refers to a combination of at least any two materials including copper, aluminum and steel. The bracket 211 is made of alloy material, which can give the material special higher thermal conductivity, plasticity and corrosion resistance. In this application, alloys include copper-aluminum alloy, copper-steel alloy, aluminum-steel alloy and copper-aluminum-steel alloy.

[0109] In this example, the bracket 211 has at least structural parts made of copper, aluminum, steel and their alloys, which can improve the thermal conductivity, plasticity and corrosion resistance of the bracket 211 itself, and can enhance the supporting effect of the explosion-proof plate 212 installed on the bracket 211, ensure the stability of the installation of the explosion-proof valve assembly 21, and protect the explosion-proof valve assembly 21.

[0110] In some examples, the second thickness L2 ranges from 1 mm to 4 mm, and the first thickness L1 is 4 to 6 times the second thickness L2, that is, in the preset direction X, the extended thickness or extended height of the second structural member 2112 is 1 mm to 4 mm, and the thickness of the first structural member 2111 is 4 mm to 24 mm.

[0111] Specifically, when the outer diameter of the second structural member 2112 in a direction perpendicular to the preset direction X is greater than its dimension in the preset direction X, it can be known that the second structural member 2112 is sheet-shaped. Then, for the first structure and the second structural member 2112, the direction perpendicular to the preset direction X can be called radial, and the preset direction X can be called axial.

[0112] For example, the thickness of the second structural member 2112 is 1 mm, 2 mm, 3 mm, or 4 mm, and correspondingly, the thickness of the first structural member 2111 may be 5 mm, 10 mm, 15 mm, or 20 mm, etc. The thickness of the second structural member 2112 may be about 20% of the thickness of the first structural member 2111. The thickness of the second structural member 2112 is less than that of the first structural member 2111, so that the connection position between the second structural member 2112 and the first structural member 2111 forms a shoulder shape, and the second structural member 2112 can better absorb stress and is not easy to transfer stress to the first structural member 2111.

[0113] In this example, there is a 4-6 times thickness difference between the first structural member 2111 and the second structural member 2112, which makes the shoulder structure formed at the connection position of the first structural member 2111 and the second structural member 2112 more obvious. While ensuring the connection strength of the second structural member 2112, a sufficient thickness difference is ensured, so that when the bracket 211 is connected to the shell 22, it can ensure sufficient anti-deformation ability while having sufficient supporting strength. In addition, by setting the difference between the first thickness L1 and the second thickness L2, a shoulder structure is formed, which is beneficial to blocking the stress from being transmitted to the first structural member 2111, thereby protecting the explosion-proof plate 212.

[0114] In some examples, combined Figure 4-7 As shown, the outer contour of the cross section of the first structural member 2111 perpendicular to the preset direction X is in the shape of a circle, an ellipse, a polygon, or a closed ring formed by a combination of an arc and a straight line.

[0115] Specifically, when the outer diameter of the bracket 211 perpendicular to the preset direction X is greater than its thickness along the preset direction X, the preset direction X is the axial direction, the direction perpendicular to the preset direction X is the radial direction, and the cross-section of the first structural component 2111 perpendicular to the preset direction X is the cross-section or radial cross-section of the first structural component 2111.

[0116] The cross-sectional outer contour of the first structural member 2111 may be circular, elliptical or polygonal, and the polygon may include a triangle, a quadrilateral, a pentagon, etc. The polygon may also be a regular polygon; in addition, Figure 4-7 As shown, the cross-sectional outer contour of the first structural member 2111 may be a closed ring composed of an arc and a straight line. For example, the closed ring includes two semicircular arcs with openings and two straight lines. The two straight lines are arranged in parallel. The two straight lines respectively connect the two end points of the two semicircular arcs to form a closed ring. Figure 4-6 shown.

[0117] Correspondingly, the cross-sectional outer contour shape of the second structural member 2112 may be similar to the cross-sectional outer contour shape of the first structural member 2111, and the cross-sectional outer contour dimension of the second structural member 2112 is larger than the cross-sectional outer contour dimension of the first structural member 2111, so that the second structural member 2112 protrudes from the outer side surface of the first structural member 2111.

[0118] In this example, the outer contour of the cross section of the first structural member 2111 is formed into a regular pattern, which is beneficial to the processing of the bracket 211 and improves the preparation efficiency of the bracket 211.

[0119] In some examples, combined Figure 11-13 As shown, the explosion-proof valve assembly 21 further includes a protection sheet 213 , which is connected to the first structural member 2111 and covers the channel 21111 . The protection sheet 213 is disposed at the explosion outlet end of the explosion-proof sheet 212 .

[0120] Specifically, the protection sheet 213 adopts a sheet structure, such as a film structure. The protection sheet 213 can be made of metal or non-metal materials, and the non-metal materials include plastics and the like.

[0121] The channel 21111 has a channel entrance and a channel exit, and the protective sheet 213 can cover the channel exit or the channel entrance; the protective sheet 213 can be located on the same side as the explosion-proof sheet 212, or on a different side from the explosion-proof sheet 212. For example, the protective sheet 213 and the explosion-proof sheet 212 are both located on one side of the channel entrance or one side of the channel exit, or, the explosion-proof sheet 212 is located on one side of the channel entrance, and the protective sheet 213 is located on one side of the channel exit.

[0122] In this example, the protection sheet 213 can protect the explosion-proof sheet 212, and the protection sheet 213 is used to cover and protect the weak area 2121 of the explosion-proof sheet 212. The protection sheet 213 can also prevent external substances such as dust, debris, and moisture from entering the interior of the explosion-proof valve assembly 21, affecting the normal operation and sealing performance of the valve.

[0123] In some examples, combined Fig.13 As shown, along the preset direction X, the first structural member 2111 has a first end surface 21112 and a second end surface 21113 , the explosion-proof plate 212 is connected to the first end surface 21112 , and the protection plate 213 is connected to the second end surface 21113 .

[0124] Specifically, the first structural member 2111 extends along the preset direction X and forms two end faces, namely the first end face 21112 and the second end face 21113. The first end face 21112 and the second end face 21113 can be planes, curved surfaces or other anisotropic combination surfaces. Taking the first end face 21112 and the second end face 21113 as planes as an example, the first end face 21112 and the second end face 21113 can be arranged in parallel or at an angle.

[0125] When the explosion-proof valve assembly 21 is assembled with the outer shell 22 in the battery cell 20, the first end face 21112 is the face of the explosion-proof valve assembly 21 facing the interior of the battery cell 20, that is, the face facing the inner cavity (or accommodating space) of the outer shell 22, and the channel entrance of the channel 21111 is formed on the first end face 21112. It can be seen that the second end face 21113 is the face facing the external space, that is, the face away from the inner cavity of the outer shell 22, and the channel outlet of the channel 21111 is formed on the second end face 21113.

[0126] During the process of charging and discharging the battery cell 20, the battery cell 23 in the battery cell 20 works to generate gas, and the gas can flow toward the explosion-proof valve assembly 21, so that when the gas inside the battery cell 20 reaches the preset bursting pressure, it breaks through the weak area 2121 of the explosion-proof plate 212, and then breaks through the protective plate 213, and then enters the external space of the battery cell 20. Therefore, it can be known that the first end face 21112 is closer to the inner cavity of the battery cell 20, so the explosion-proof plate 212 is installed on the first end face 21112, and the protective plate 213 is installed on the second end face 21113, so that the protective plate 213 is located outside or on the outer surface of the shell 22 of the battery cell 20, so as to protect the explosion-proof plate 212.

[0127] In this example, the explosion-proof plate 212 and the protective plate 213 are respectively arranged on the two end surfaces of the first structural member 2111, so that the protective plate 213 can cover and protect the explosion-proof plate 212. In addition, the explosion-proof plate 212 and the protective plate 213 are arranged relative to each other, which is conducive to adjusting and increasing the bursting pressure of the explosion-proof valve assembly 21, thereby realizing the adjustable design of the pressure of the explosion-proof valve assembly 21.

[0128] In some examples, combined Figure 7-9 and Fig.13 As shown, a groove 21114 is formed on the first end surface 21112 , the groove 21114 is communicated with the channel 21111 , and the explosion-proof plate 212 is connected in the groove 21114 .

[0129] Specifically, a groove 21114 is formed on the first end face 21112, and a radial dimension of the groove 21114 is greater than a radial dimension of a channel entrance formed on the first end face 21112, so that the channel entrance is opened at the bottom of the groove 21114, and the explosion-proof plate 212 is installed in contact with the bottom of the groove and fits with the surface of the bottom of the groove. The explosion-proof plate 212 covers the channel entrance, and the groove wall of the groove 21114 can contact with the circumferential surface of the explosion-proof plate 212, so that the groove wall of the groove 21114 plays a role in positioning the explosion-proof plate 212.

[0130] In the preset direction X, the explosion-proof plate 212 and the second structural member 2112 are staggered, for example, the second surface 21122 of the second structural member 2112 is flush with the second end face 21113 of the first structural member 2111, so that the depth of the groove 21114 is greater than the sum of the thickness of the explosion-proof plate 212 and the thickness of the second structural member 2112, and then after the explosion-proof plate 212 is installed in the groove 21114, in the preset direction X, a staggered or spaced relationship can be formed between the explosion-proof plate 212 and the second structural member 2112, so that the stress absorbed and transmitted on the second structural member 2112 is not easily transmitted directly to the explosion-proof plate 212, thereby reducing the risk of deformation of the explosion-proof plate 212.

[0131] In this example, the explosion-proof plate 212 is installed in the groove 21114 on the first end surface 21112 of the first structural member 2111. The groove wall of the groove 21114 can position and limit the explosion-proof plate 212. By controlling the depth of the groove 21114, after the explosion-proof plate 212 is installed in the groove 21114, it can be misaligned with the second structural member 2112 in a preset direction X, thereby forming an obstacle when stress is transmitted from the second structural member 2112 to the explosion-proof plate 212, which is beneficial to reduce the stress transmitted to the explosion-proof plate 212, thereby reducing the risk of deformation of the explosion-proof plate 212.

[0132] In a specific embodiment, in combination Figure 3-13As shown, the explosion-proof valve assembly 21 includes a bracket 211 and an explosion-proof disk 212, the bracket 211 includes a first structural member 2111 and a second structural member 2112, the first structural member 2111 extends a first thickness L1 along a preset direction X, the first structural member 2111 has a first end face 21112 and a second end face 21113 along the preset direction X, the first structural member 2111 is provided with a channel 21111 penetrating the first end face 21112 and the second end face 21113, the second structural member 2112 is convexly connected to the outer side surface of the first structural member 2111, The second structural member 2112 has a second thickness L2 along the preset direction X, and the second thickness L2 is less than the first thickness L1; the explosion-proof plate 212 is connected to the first structural member 2111 and covers the channel 21111; the second structural member 2112 is continuous and is arranged around the preset direction X on the outer side of the first structural member 2111; along the preset direction X, the second structural member 2112 has a first surface 21121 and a second surface 21122, and the first surface 21121 is flush with the first end face 21112; or, the second surface 21122 is flush with the second end face 21112. The first end face 21113 is flush with the second end face 21113; or, the second structural member 2112 is arranged between the first end face 21112 and the second end face 21113; an internal thread structure or an external thread structure 21123 is formed on the second structural member 2112; at least one of the first structural member 2111 and the second structural member 2112 is a structural member made of metal material; the outer contour of the cross section of the first structural member 2111 perpendicular to the preset direction X is circular, elliptical, polygonal or a closed ring composed of arcs and straight lines; the explosion-proof valve assembly 21 also includes a protective sheet 213, which protects The sheet 213 is connected to the first structural member 2111 and covers the channel 21111. The protective sheet 213 is arranged at the explosion outlet end of the explosion-proof sheet 212. Along the preset direction X, the first structural member 2111 has a first end face 21112 and a second end face 21113. The explosion-proof sheet 212 is connected to the first end face 21112, and the protective sheet 213 is connected to the second end face 21113. A groove 21114 is formed on the first end face 21112, and the groove 21114 is connected to the channel 21111. The explosion-proof sheet 212 is connected in the groove 21114.

[0133] Based on the above explosion-proof valve assembly 21, the present application also proposes an example of a battery cell 20, referring to Fig.14 and Fig.15 As shown, the battery cell 20 includes a shell 22 , a battery cell 23 and an explosion-proof valve assembly 21 in any of the above embodiments. The shell 22 has a receiving space, the battery cell 23 is received in the receiving space, and the second structural member 2112 is connected to the shell 22 .

[0134] Specifically, the battery cell 23 is one of the core components of the battery 100. The battery cell 23 can convert chemical energy into electrical energy. The basic structure of the battery cell 23 includes a positive electrode sheet, a negative electrode sheet, an electrolyte, a separator and a pole ear. The pole ear includes a positive pole ear connected to the positive electrode sheet and a negative electrode connected to the negative electrode sheet. The positive electrode sheet and the negative electrode sheet are separated by an electrolyte and a separator. During the discharge process, the positive electrode sheet and the negative electrode sheet undergo a redox reaction to generate current. The types of battery cells 23 include lithium-ion battery cells 23 (Li-ion), nickel-metal hydride battery cells 23 (NiMH), nickel-cadmium battery cells 23 (NiCd), etc. Lithium-ion battery cells 23 have the characteristics of high energy density and light weight.

[0135] The shell 22 is used to install and accommodate the battery cell 23 in the battery 100, so the shell 22 is surrounded to form a accommodating space, and the battery cell 23 is installed in the accommodating space; the shell 22 can be an integrally formed structure, that is, after a portion of the shell 22 is formed, the battery cell 23 is assembled with the portion of the shell 22, and then integrally formed to form a whole shell 22, and the second structural member 2112 in the explosion-proof valve assembly 21 can be installed at any position of the shell 22; or, the shell 22 can also adopt a split structure, that is, the shell 22 includes a plurality of independent shell parts, and the plurality of shell parts are connected and jointly surrounded to form a accommodating space, and the second structural member 2112 in the explosion-proof valve assembly 21 can be installed on any independent shell part.

[0136] In the explosion-proof valve assembly 21, in the preset direction X, the second structural component 2112 has a first surface 21121 and a second surface 21122. When the explosion-proof valve assembly 21 is connected to the outer shell 22, the first surface 21121 or the second surface 21122 of the second structural component 2112 can be fitted with the inner surface or the outer surface of the outer shell 22, and welding is performed at the fitting position to connect and fix the second structural component 2112 to the outer shell 22.

[0137] In this example, during the use of the battery cell 20, the shell 22 is prone to deformation. However, since the explosion-proof disc 212 in the explosion-proof valve assembly 21 is connected to the shell 22 through the bracket 211, the bracket 211 includes a first structural member 2111 and a second structural member 2112. The second structural member 2112 is convexly connected to the side of the first structural member 2111 for connection with the shell 22. The explosion-proof disc 212 is installed on the first structural member 2111, so that the thickness of the first structural member 2111 is greater than the thickness of the second structural member 2112. The second structural member 2112 is used to be directly connected to the shell 22, so that the stress generated by the deformation of the shell 22 is absorbed and transmitted by the second structural member 2112, and the stress transmitted to the first structural member 2111 is reduced. The first structural member 2111 further absorbs the stress, thereby further reducing the stress transmitted to the explosion-proof disc 212, and reducing the influence of external force on the explosion-proof disc 212, thereby ensuring that the bursting pressure of the explosion-proof disc 212 remains unchanged and the performance of the battery 100 is stable.

[0138] In some examples, reference Fig.14 and Fig.15 As shown, the housing 22 includes a first shell 221 and a second shell 222 . The first shell 221 and the second shell 222 are detachably connected to form an inner cavity. The explosion-proof valve assembly 21 is connected to the first shell 221 or the second shell 222 .

[0139] Specifically, the first shell 221 and the second shell 222 cover each other, and the first shell 221 and the second shell 222 jointly define a storage space for accommodating the battery cell 23. The first shell 221 can be a hollow structure with one end open, and the hollow part of the first shell 221 forms an inner cavity. The second shell 222 can be a plate-like structure, and the second shell 222 covers the open side of the first shell 221, so that the first shell 221 and the second shell 222 jointly define a storage space; the first shell 221 and the second shell 222 can also be hollow structures with one side open, and the hollow parts of the first shell 221 and the second shell 222 can both form an inner cavity, and the open side of the first shell 221 covers the open side of the second shell 222, so that the first shell 221 and the second shell 222 jointly define a storage space. Of course, the housing 22 formed by the first shell 221 and the second shell 222 can be in a variety of shapes, such as a cylinder, a cuboid, etc.

[0140] Taking the first shell 221 as a hollow structure as an example, an inner cavity is formed on the first shell 221, and the inner cavity is used to accommodate the battery cell 23. The battery cell 23 enters and exits the inner cavity through the opening on the first shell 221 that is connected to the inner cavity. The second shell 222 covers the first shell 221 to form a storage space for accommodating the battery cell 23. The second shell 222 is plate-shaped to form a cover structure. Figure 2As shown, the explosion-proof valve assembly 21 is installed on the second shell 222, that is, the second structural member 2112 of the bracket 211 is connected to the second shell 222, and the connection method between the second structural member 2112 and the second shell 222 includes welding, threaded connection, snap connection, etc.

[0141] In this example, the shell 22 adopts a split structure, and the explosion-proof valve assembly 21 can be installed on any first shell 221 or second shell 222. The first shell 221 and the second shell 222 are detachably connected, so as to facilitate the installation and disassembly of the explosion-proof valve assembly 21 and facilitate maintenance; in addition, the split shell 22 can also hinder the transmission of stress when deformation occurs, so as to help reduce the influence of stress on the explosion-proof plate 212.

[0142] Based on the above-mentioned battery cell 20, the present application also proposes an example of a battery 100. Figure 1 and Figure 2 As shown, the battery 100 includes the explosion-proof valve assembly 21 as described in any of the above examples, or includes the battery cell 20 as described in any of the above examples.

[0143] The battery 100 in this example includes a box body 10 and a battery cell 20, and the battery cell 20 is installed in the box body 10. The battery 100 may include one battery cell 20 as described above, or the battery 100 may include multiple battery cells 20. When multiple battery cells 20 as described above are provided in the battery 100, the multiple battery cells 20 may be arranged according to a preset rule. The multiple battery cells 20 may be arranged in a row of multiple columns or multiple rows of multiple columns. The multiple battery cells 20 may be connected in series, in parallel, or in series-parallel hybrid.

[0144] It is understandable that in this example, only the battery 100 including the above-mentioned battery cell 20 is described, and the battery 100 may also include other functional components, which will not be described in detail.

[0145] The example of the battery 100 in the present application is based on the example of the battery cell 20 described above. The example of the battery 100 includes all the technical effects of the example of the battery cell 20 described above, which will not be described in detail.

[0146] In some examples, an example of an electrical device is disclosed, the electrical device including the explosion-proof valve assembly 21 described in any of the above examples, or the battery cell 20 described in any of the above examples, or the battery 100 described in any of the above examples.

[0147] The electrical devices in this example include, but are not limited to: mobile phones, portable devices, laptop computers, electric vehicles, electric vehicles 1000, ships, spacecraft, electric toys and electric tools, etc. The battery cells 20 described in any of the above examples can be installed separately in the electrical devices, and the above-mentioned battery 100 can also be installed in the electrical devices.

[0148] The examples of the electrical device in the present application are based on the examples of the battery cell 20 or the battery 100 described above, and the examples of the electrical device include all the technical effects of the examples of the battery cell 20 or the battery 100 described above, which will not be repeated.

[0149] The above are only preferred embodiments of the present application, and only specifically describe the technical principles of the present application. These descriptions are only for explaining the principles of the present application and cannot be interpreted as limiting the scope of protection of the present application in any way. Based on the explanation here, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application, and other specific implementation methods of the present application that can be associated with the technicians in this field without creative work, should be included in the scope of protection of the present application.

Claims

1. An explosion-proof valve assembly, characterized in that: include: A bracket, comprising a first structural member and a second structural member, wherein the first structural member has a first thickness extending along a preset direction, the first structural member has a first end face and a second end face arranged opposite to each other along the preset direction, the first structural member is provided with a passage passing through the first end face and the second end face, the second structural member is convexly arranged on an outer side surface of the first structural member, the second structural member has a second thickness extending along the preset direction, and the second thickness is less than the first thickness; The explosion-proof plate is connected to the first structural member and covers the passage.

2. The explosion-proof valve assembly according to claim 1, characterized in that: The second structural member is continuous and is arranged around the preset direction on the outer side surface of the first structural member.

3. The explosion-proof valve assembly according to claim 1, characterized in that: The second structural member includes a plurality of sub-second structural members, and the plurality of sub-second structural members are arranged around the preset direction at intervals on the outer side surface of the first structural member; each of the sub-second structural members has the second thickness along the preset direction.

4. The explosion-proof valve assembly according to claim 3, characterized in that: The second thickness of each of the sub-second structural members is the same; or, among the sub-second structural members, at least two of the sub-second structural members have unequal values ​​of the second thickness.

5. The explosion-proof valve assembly according to any one of claims 1 to 4, characterized in that: Along the preset direction, the second structural member has a first surface and a second surface, the first surface is flush with the first end surface; or, the second surface is flush with the second end surface; or, the second structural member is configured between the first end surface and the second end surface.

6. The explosion-proof valve assembly according to any one of claims 1 to 4, characterized in that: The second structural member is formed with an internal thread structure or an external thread structure.

7. The explosion-proof valve assembly according to any one of claims 1 to 4, characterized in that: At least one of the first structural member and the second structural member is a structural member made of metal material.

8. The explosion-proof valve assembly according to any one of claims 1 to 4, characterized in that: The outer contour of the cross section of the first structural member perpendicular to the preset direction is in the shape of a circle, an ellipse, a polygon, or a closed ring formed by a combination of an arc and a straight line.

9. The explosion-proof valve assembly according to any one of claims 1 to 4, characterized in that: The explosion-proof valve assembly further comprises a protection sheet, which is connected to the first structural member and covers the channel, and is arranged at the explosion outlet end of the explosion-proof sheet.

10. The explosion-proof valve assembly according to claim 9, characterized in that: The explosion-proof sheet is connected to the first end surface, and the protection sheet is connected to the second end surface.

11. The explosion-proof valve assembly according to claim 10, characterized in that: A groove is formed on the first end surface, the groove is connected to the channel, and the explosion-proof plate is connected in the groove.

12. A battery cell, characterized in that: The battery cell comprises a shell, a battery cell and the explosion-proof valve assembly as claimed in any one of claims 1 to 11, the shell has a receiving space, the battery cell is received in the receiving space, and the second structural member is connected to the shell.

13. The battery cell according to claim 12, characterized in that: The housing comprises a first shell and a second shell, the first shell and the second shell are detachably connected to form a receiving space, and the explosion-proof valve assembly is connected to the first shell or the second shell.

14. A battery, characterized in that: It comprises an explosion-proof valve assembly as described in any one of claims 1 to 11, or it comprises a battery cell as described in claim 12 or 13.

15. An electrical device, characterized in that: It comprises the explosion-proof valve assembly as described in any one of claims 1 to 11, or, comprises the battery monomer as described in claim 12 or 13, or, comprises the battery as described in claim 14.

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