Balance valve, battery pack and electric device

Abstract

The embodiment of the invention provides a balance valve, a battery pack and an electric device, the balance valve comprises a valve body, a first sealing piece and a second sealing piece, the valve body is provided with a through first channel, the first channel is divided into a first part and a second part, the first sealing piece is located in the first channel and can move relative to the valve body to block or open the first part, and the second sealing piece is located in the second channel. The second sealing piece is located in the first channel and can move relative to the valve body so as to block or open the second part. The battery pack includes a balance valve. The power utilization device comprises a battery pack.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a balancing valve, a battery pack and an electrical device. Background Art

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] The sealing of the battery pack is related to the safety of the internal parts of the battery pack.

[0004] The above statements are only used to provide background information related to the present application and do not necessarily constitute prior art. Summary of the invention

[0005] The present application provides a balancing valve, a battery pack and an electrical device, which can improve the sealing performance of the battery pack.

[0006] In a first aspect, the present application provides a balancing valve, comprising a valve body, a first seal and a second seal, the valve body having a through first channel, the first channel being divided into a first part and a second part, the first seal being located in the first channel and being movable relative to the valve body to block or open the first part, the second seal being located in the first channel and being movable relative to the valve body to block or open the second part.

[0007] In the embodiment of the present application, the first channel in the valve body includes a first part and a second part, and the first part and the second part are opened and closed by a first seal and a second seal, respectively. Moreover, the first seal and the second seal are both movable relative to the valve body. When the pressures on the inner and outer sides of the balancing valve are not equal, the first seal and the second seal achieve the purpose of opening or closing the first part and the second part by moving relative to the valve body, thereby achieving automatic opening and closing of the balancing valve, overcoming the problem of water vapor easily entering the valve body and causing insulation failure or short circuit failure in the normally open balancing valve in the related art.

[0008] In some embodiments, the first sealing member includes a first connecting portion and a first movable portion, the first connecting portion is connected to the valve body, and the first movable portion is configured to move to a blocking position under the action of pressure difference to block the first part or to leave the blocking position under the action of pressure difference to open the first part.

[0009] By providing the first movable part, the first movable part can be driven to move relative to the first connecting part and the valve body under the action of the pressure difference, so that the first movable part can be switched between a blocking position for blocking the first part and an opening position for opening the first part.

[0010] In some embodiments, the first movable part is rotatably connected to the first connecting part. In this embodiment, the first movable part switches between a blocking position for blocking the first part and an opening position for opening the first part by rotating relative to the first connecting part.

[0011] In other embodiments, the first movable part and the first connecting part are integrally formed, and the first movable part is made of a flexible material or an elastic material. In this embodiment, by making the first movable part of a flexible material or an elastic material, the material of the first movable part can be made softer or elastic, so that the first movable part can be bent or deformed under the action of a pressure difference, thereby changing its position relative to the first connecting part, thereby achieving the purpose of opening or closing the first part.

[0012] In some embodiments, the second sealing member includes a second connecting portion and a second movable portion, the second connecting portion is connected to the valve body, and the second movable portion is configured to move to a blocking position under the action of pressure difference to block the second part or to leave the blocking position under the action of pressure difference to open the second part.

[0013] By providing the second movable part, the second movable part can be driven to move relative to the second connecting part and the valve body under the action of the pressure difference, so that the second movable part can be switched between a blocking position for blocking the second part and an opening position for opening the second part.

[0014] In some embodiments, the second movable part is rotatably connected to the second connecting part. In this embodiment, the second movable part switches between a blocking position for blocking the second part and an open position for opening the second part by rotating relative to the second connecting part.

[0015] In other embodiments, the second movable part and the second connecting part are integrally formed, and the second movable part is made of a flexible material or an elastic material. In this embodiment, by making the second movable part of a flexible material or an elastic material, the material of the second movable part can be made softer or elastic, so that the second movable part can be bent or deformed under the action of a pressure difference, thereby changing its position relative to the second connecting part, thereby achieving the purpose of opening or closing the second part.

[0016] In some embodiments, the balancing valve also includes a first elastic member and a second elastic member, the first elastic member is connected to the first sealing member and is used to provide the first sealing member with an elastic force to move along a first direction toward a position of blocking the first part; the first direction is an extension direction of the first channel at the first elastic member, and the second elastic member is connected to the second sealing member and is used to provide the second sealing member with an elastic force to move along a direction opposite to the first direction toward a position of blocking the second part.

[0017] By providing the first elastic member and the second elastic member, elastic force can be provided to the first sealing member and the second sealing member respectively, thereby enhancing the sealing effect.

[0018] In some embodiments, the first elastic member and the second elastic member at least partially overlap in the first direction, which can effectively shorten the length of the balancing valve along the first direction, reduce the volume of the balancing valve, and further reduce the overall volume of the battery pack, thereby achieving the purpose of increasing the total capacity of the battery pack within a limited space.

[0019] In some embodiments, one end of the first elastic member is connected to the first sealing member, and the other end of the first elastic member is located on one side of the first sealing member in the first direction; one end of the second elastic member is connected to the second sealing member, and the other end of the second elastic member is located on the same side of the second sealing member in the first direction; or

[0020] One end of the first elastic member is connected to the first sealing member, and the other end of the first elastic member is located on one side of the first sealing member in the first direction; one end of the second elastic member is connected to the second sealing member, and the other end of the second elastic member is located on the other side of the second sealing member in the first direction.

[0021] Regardless of whether the first elastic member and the second elastic member are arranged on the same side of the first sealing member or on both sides of the first sealing member, in the first direction, the first elastic member and the second elastic member overlap, which can effectively shorten the length of the first elastic member and the second elastic member in the first direction, thereby reducing the volume of the balancing valve.

[0022] In some embodiments, there is no separation between the first portion and the second portion.

[0023] In some embodiments, the first portion surrounds the second portion;

[0024] A first through hole is formed in the middle of the first sealing member, the second sealing member passes through the first through hole, a first portion is formed between the first sealing member and the valve body, and a second portion is formed between the second sealing member and the first sealing member;

[0025] The first sealing member is sealingly connected to the valve body to seal the first part; the second sealing member is sealingly connected to the first sealing member to seal the second part.

[0026] In some embodiments, the first portion and the second portion are distributed in a direction perpendicular to the first direction;

[0027] A first portion is formed between the valve body and the first sealing member, and a second portion is formed between the valve body and the second sealing member;

[0028] The first sealing member is sealingly connected to the valve body and the second sealing member to seal the first portion; the second sealing member is sealingly connected to the valve body and the first sealing member to seal the second portion.

[0029] In some embodiments, the balancing valve further includes a partition connected to the valve body, and the partition is located in the first channel to divide the first channel into a first part and a second part.

[0030] By providing the separator, the first part and the second part can be divided more clearly, thereby avoiding accidental connection between the first part and the second part.

[0031] In some embodiments, the partition is annular, a first portion is formed between the partition and the valve body, a second portion is formed inside the partition, and the first portion surrounds the second portion; the first sealing member is annular;

[0032] The first sealing member is sealingly connected to the valve body and the partition member to seal the first portion; the second sealing member is sealingly connected to the partition member to seal the second portion.

[0033] In some embodiments, the partition is plate-shaped, a first portion is formed between one side of the partition and the valve body, a second portion is formed between the other side of the partition and the valve body, and the first portion and the second portion are distributed in a direction perpendicular to the first direction;

[0034] The first sealing member is sealingly connected to the valve body and the partition member to seal the first portion; the second sealing member is sealingly connected to the valve body and the partition member to seal the second portion.

[0035] In some embodiments, the first elastic member is sleeved on the outside of the second elastic member.

[0036] By adopting the method of sleeve-mounting the first elastic member on the outside of the second elastic member, the first elastic member and the second elastic member can be completely overlapped in the first direction, so that the length of the first elastic member and the second elastic member in the first direction is the length of the first elastic member and the second elastic member with a longer length along the first direction, thereby effectively shortening the overall length of the first elastic member and the second elastic member and reducing the space occupied by the balancing valve.

[0037] In some embodiments, the first elastic member is located on one side of the first direction perpendicular to the direction, and the second elastic member is located on the other side of the first direction perpendicular to the direction.

[0038] In some embodiments, the second seal includes a sealing body and a third sealing portion and a first limiting member respectively arranged at both ends of the sealing body, the sealing body passes through the first through hole, the third sealing portion is used to seal the first through hole, the third sealing portion and the first limiting member are respectively located on both sides of the first seal, the second elastic member is mounted on the outside of the sealing body, and the two ends of the second elastic member are respectively connected to the first seal and the first limiting member.

[0039] By providing the third sealing part, the long groove can be sealed in cooperation with the first sealing part; and after the second sealing part and the first sealing part move relative to each other, the third sealing part leaves the first sealing part, and the long groove can be opened. By providing the first limiting part, the movement of the second sealing part can be limited to prevent the second sealing part from separating from the first sealing part.

[0040] In some embodiments, the first limiting member is provided with a first limiting portion, and the first limiting portion is configured to limit the second elastic member in a direction perpendicular to the first direction.

[0041] By setting the first limiting portion, the first elastic member can be limited in a direction perpendicular to the first direction to guide the deformation of the first elastic member and prevent the first sealing member from failing in its sealing function on the first part due to misalignment caused by the deformation of the first elastic member.

[0042] In some embodiments, the sealing body is provided with a plurality of long grooves arranged at intervals along the circumferential direction, and the long grooves extend along the first direction to form the second portion.

[0043] By providing a long groove on the sealing body, the long groove can be opened when the second sealing member and the first sealing member move relative to each other, thereby achieving the purpose of opening the second part; and when the third sealing portion of the second sealing member contacts the first sealing member, the long groove is closed, thereby achieving the purpose of blocking the second part. In the embodiment in which the long groove is provided on the sealing body, there is no need to provide a special partition for separating the first part and the second part, thereby simplifying the overall structure of the balancing valve.

[0044] In some embodiments, the first sealing member includes a first sealing portion and a second sealing portion, the hardness of the first sealing portion is greater than that of the second sealing portion, the first elastic member is connected to the first sealing portion, and the second sealing portion is arranged on a side of the first sealing portion away from the first elastic member.

[0045] By setting the hardness of the first sealing part to be greater than that of the second sealing part, the second sealing part with smaller hardness can contact the sealing surface in the valve body, thereby improving the sealing effect on the first channel; the first sealing part with greater hardness can provide more reliable support for the first elastic part and the second elastic part, preventing the first sealing part from being subjected to greater pressure due to excessive internal and external pressure difference, or even damaging the first sealing part, thereby affecting the deformation of the first elastic part and the second elastic part, and affecting the set pressure of the intake and exhaust.

[0046] In some embodiments, the wall surface of the first channel is provided with at least two first protrusions spaced apart in the circumferential direction, a gap is provided between the first seal and the first protrusions, and the gap between two adjacent first protrusions is communicated with the first channel.

[0047] By providing the first protrusions, a gap can be formed between two adjacent first protrusions. After the first seal leaves the sealing position, the first channel can be connected through the gap to enable the gas to flow in the first channel.

[0048] At the same time, there is a gap between the first seal and the first protrusion, which can prevent the first protrusion from blocking the movement of the first seal in the first channel and avoid wear between the first seal and the first protrusion during movement relative to the valve body.

[0049] In some embodiments, the valve body includes a valve body and a second limiter, the first channel is disposed in the valve body, the second limiter is connected to the valve body, and the second limiter is configured to limit the first elastic member in a first direction.

[0050] By providing the second limiting member, the first elastic member can be limited to prevent the first elastic member from leaving the first channel.

[0051] In some embodiments, a blocking member is provided on the wall of the first channel, and the blocking member is arranged on the side of the second seal away from the second limit member to limit the movement range of the second seal in the direction away from the second limit member, and the blocking member is provided with a second through hole connected to the first channel.

[0052] By providing a blocking member, the movement of the second sealing member can be limited to prevent the second sealing member from moving too far away from the first limiting member and moving out of the first channel, thereby causing a malfunction of the balancing valve. By providing a second through hole, the blocking member can be prevented from sealing the first channel, thereby affecting the exhaust and intake of the balancing valve.

[0053] In some embodiments, the balancing valve further includes a waterproof and breathable membrane, and the waterproof and breathable membrane is disposed at an end close to the first channel and away from the second limiting member.

[0054] The waterproof breathable membrane allows gas to pass through, but water vapor cannot. By setting up a waterproof breathable membrane, it can play a moisture-proof role. Even if the balance valve is in the intake or exhaust state, it can prevent water vapor from entering the battery pack and generating condensation, which in turn leads to a series of component failures, and even causes insulation failure or short circuit failure, posing a great threat to the personal and property safety of passengers.

[0055] In some embodiments, the balancing valve further includes a valve cover, which is disposed at an end of the first channel away from the second limit member, and the valve cover is configured to connect the first channel with external gas.

[0056] By providing the valve cover, the components in the valve body can be effectively protected and dustproof. The valve cover is configured to connect the first channel with the external gas, which can prevent the valve cover from sealing the first channel and affecting the airflow connection inside and outside the balancing valve.

[0057] In a second aspect, the present application provides a battery pack, including a box body and the above-mentioned balancing valve, wherein the balancing valve is installed on the box body.

[0058] In a third aspect, the present application provides an electrical device, comprising the above-mentioned battery pack, wherein the battery pack is used to supply electrical energy to the electrical device.

[0059] 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

[0060] 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 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 the drawings without paying creative work.

[0061] Figure 1 It is a schematic diagram of the structure of some embodiments of the battery pack disclosed in this application.

[0062] Figure 2 Detailed description of the invention is provided in conjunction with an exploded view of some embodiments of the balancing valve disclosed in the present application.

[0063] Figure 3 It is a front view of the first embodiment of the balancing valve disclosed in this application.

[0064] Figure 4 The first embodiment of the balancing valve disclosed in this application is Figure 3 Cross-sectional view of section AA.

[0065] Figure 5 The first embodiment of the balancing valve disclosed in this application is Figure 3 Cross-sectional view of section BB.

[0066] Figure 6 It is a rear view of the second embodiment of the balancing valve disclosed in the present application.

[0067] Figure 7 The second embodiment of the balancing valve disclosed in this application is Figure 6 Cross-sectional view of section CC.

[0068] Figure 8 The second embodiment of the balancing valve disclosed in this application is Figure 6 Cross-sectional view of section DD.

[0069] Fig. 9It is an exploded view of the third embodiment of the balancing valve disclosed in this application.

[0070] Fig.10 It is a front view of the third embodiment of the balancing valve disclosed in this application.

[0071] Fig.11 It is a rear view of the third embodiment of the balancing valve disclosed in the present application.

[0072] Fig.12 The third embodiment of the balancing valve disclosed in this application is Fig.11 Cross-sectional view of section EE.

[0073] Fig.13 yes Fig.12 Schematic diagram of the structure of the middle part.

[0074] Fig.14 It is a schematic structural diagram of the second sealing component in the third embodiment of the balancing valve disclosed in this application.

[0075] Fig.15 It is a schematic structural diagram of the second limit member in the third embodiment of the balancing valve disclosed in the present application.

[0076] Fig.16 It is a structural schematic diagram of the first limit member in the third embodiment of the balancing valve disclosed in this application.

[0077] Fig.17 It is a stereoscopic view of the third embodiment of the balancing valve disclosed in the present application at a first angle.

[0078] Fig.18 It is a side view of the third embodiment of the balancing valve disclosed in the present application.

[0079] Fig.19 The third embodiment of the balancing valve disclosed in this application is Fig.18 Cross-sectional view of section FF.

[0080] Fig. 20 It is a stereoscopic view of the third embodiment of the balancing valve disclosed in the present application at a second angle.

[0081] Fig.21 It is a schematic diagram of the internal structure of the third embodiment of the balancing valve disclosed in the present application in the intake state.

[0082] Fig. 22 It is a schematic diagram of the internal structure of the third embodiment of the balancing valve disclosed in the present application in the exhaust state.

[0083] Fig.23 It is a front view of the fourth embodiment of the balancing valve disclosed in this application.

[0084] Fig.24 The fourth embodiment of the balancing valve disclosed in this application is Fig.23 Cross-sectional view of section GG.

[0085] Fig.25 It is a stereoscopic view of the fifth embodiment of the balancing valve disclosed in the present application.

[0086] Fig.26 It is a rear view of the fifth embodiment of the balancing valve disclosed in the present application.

[0087] Fig. 27 The fifth embodiment of the balancing valve disclosed in this application is Fig.26 Cross-sectional view of section HH.

[0088] Fig.28 It is a stereoscopic diagram of the sixth embodiment of the balancing valve disclosed in the present application.

[0089] Fig.29 It is a rear view of the sixth embodiment of the balancing valve disclosed in the present application.

[0090] Fig.30 The sixth embodiment of the balancing valve disclosed in this application is Fig.29 Cross-sectional view of section II.

[0091] In the drawings, the drawings are not drawn to scale.

[0092] Marking Description:

[0093] 1000, vehicle; 100, battery; 200, controller; 300, motor;

[0094] 100a, battery pack; 10, balancing valve; 20, box body;

[0095] 1. valve body; 11. first channel; 12. sealing surface; 13. first protrusion; 14. gap; 15. blocking member; 16. second through hole; 17. sleeve portion;

[0096] 101, support member; 102, first hanging part; 103, second hanging part; 104, first fixing member; 105, second fixing member; 106, first supporting part; 107, second supporting part; 108, third supporting part; 109, fifth blocking part;

[0097] 111, first cavity; 112, second cavity; 113, first partition; 114, second partition;

[0098] 2. first sealing member; 2a. first connecting portion; 2b. first movable portion; 21. first sealing portion; 22. second sealing portion;

[0099] 201, first body; 202, first blocking portion; 203, second blocking portion; 204, second body; 205, third blocking portion; 206, fourth blocking portion; 207, extension portion;

[0100] 3. second sealing member; 3a. second connecting portion; 3b. second movable portion; 31. long groove; 32. sealing body; 33. third sealing portion; 34. first limiting member; 35. slot; 36. head; 37. second limiting groove; 38. second protruding portion;

[0101] 301, fourth sealing part; 302, fifth sealing part;

[0102] 4. First elastic member; 5. Second elastic member; 6. Second limiting member; 61. First limiting groove; 62. Third protrusion; 7. Waterproof breathable membrane; 8. Valve cover; 9. Third sealing member. DETAILED DESCRIPTION

[0103] The following embodiments of the technical solution of the present application will be 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.

[0104] 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.

[0105] 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 addition, the term "perpendicular" does not mean perpendicular in the strict sense, but is within the allowable error range. "Parallel" does not mean parallel in the strict sense, but is within the allowable error range.

[0106] 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.

[0107] 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.

[0108] In the description of the embodiments of the present application, the term "multiple" refers to more than two, unless otherwise clearly defined. Similarly, "multiple groups" refers to more than two groups, and "multiple sheets" refers to more than two sheets, unless otherwise clearly defined.

[0109] 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.

[0110] 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.

[0111] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0112] The battery pack is the energy storage system for all pure electric vehicles and plug-in hybrid vehicles. The battery pack has high requirements for insulation, so the humidity inside the battery pack needs to be maintained at a certain level to prevent moisture condensation and cause insulation failure.

[0113] Moreover, the battery pack releases a lot of heat during operation. In order to maintain the air permeability of the battery pack, a balancing valve is usually used as a component to achieve gas communication between the battery pack and the outside world. Otherwise, the air pressure inside the battery pack will be too high, causing damage to the upper cover or sealing surface structure, causing battery pack failure.

[0114] After research, the present applicant found that the balancing valve in the relevant technology is usually of normally open design, which will be affected by external water vapor. When the water vapor enters the interior of the battery pack, there is a risk of condensation, which may cause some components inside the battery pack to fail, and even cause insulation failure or short circuit failure, posing a great threat to the personal and property safety of passengers in vehicles using the battery pack.

[0115] To this end, the present application improves the structure of the balancing valve and provides a two-way balancing valve. When the pressure inside the battery pack is greater than the external pressure, the balancing valve will open outward to allow the gas inside the battery pack to be discharged, thereby preventing the upper cover or sealing surface structure from being damaged due to excessive internal pressure of the battery pack, causing battery pack failure; when the pressure inside the battery pack is less than the external pressure, the balancing valve will open inward to allow external gas to enter the battery pack, thereby preventing the external air pressure from causing squeezing pressure on the components inside the battery pack; and when the pressure inside the battery pack is equal to the external pressure, the balancing valve remains closed, thereby preventing external water vapor from entering the battery pack, causing insulation failure or short circuit failure.

[0116] The balancing valve provided in the embodiment of the present application can be installed on the box of the battery pack to prevent external water vapor from entering the interior of the box, thereby effectively protecting the components inside the box.

[0117] The battery pack provided in the embodiment of the present application can be used in, but not limited to, electrical equipment such as vehicles, ships or aircraft. The battery pack disclosed in the present application can be used to form a power supply system for the electrical equipment, so that the air pressure inside and outside the battery pack can be effectively balanced, thereby improving the safety of the battery pack.

[0118] The embodiment of the present application provides an electric device using a battery as a power source, and the battery is configured to provide electric energy to the electric device. The electric device may be, but is not limited to, a mobile phone, a portable device, a laptop computer, an electric vehicle, an electric car, a ship, a spacecraft, an electric toy, an electric tool, etc. For example, the spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and an electric tool for railways, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer.

[0119] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device in an embodiment of the present application.

[0120] Please refer to Figure 1 , Figure 1 A 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, the battery 100 being used to provide electrical energy for the motor 300 and other components in the vehicle, and the controller 200 being used to control the operation of the motor 300, for example, for the starting, navigation and working power requirements of the vehicle 1000 during driving.

[0121] In some embodiments of the present application, the battery pack 100a can be used not only as an operating power source for the vehicle, but also as a driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0122] Reference Figure 2 As shown, the battery pack 100a includes a balancing valve 10 and a box 20, and the balancing valve 10 is installed on the box 20 to control the air pressure in the box 20. A plurality of battery cells can be arranged in the box 20, and the battery cells are accommodated in the box 20. Among them, the box 20 is used to provide a storage space for the battery cells, and the box 20 can adopt a variety of structures. In some embodiments, the box 20 may include a first cover and a second cover, and the first cover and the second cover cover each other, and the first cover and the second cover together define a storage space for accommodating the battery cells. The second cover may be a hollow structure with one end open, and the first cover may be a plate-like structure, and the first cover covers the open side of the second cover, so that the first cover and the second cover together define a storage space; the first cover and the second cover may also be hollow structures with one side open, and the open side of the first cover covers the open side of the second cover. Of course, the box 20 formed by the first cover and the second cover may be in a variety of shapes, such as a cylinder, a cuboid, etc.

[0123] Among them, battery cells include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries or magnesium-ion batteries, etc., which are not limited in the embodiments of the present disclosure. Battery cells can be cylindrical, flat, rectangular or other shapes, etc., which are not limited in the embodiments of the present disclosure. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, which are not limited in the embodiments of the present disclosure.

[0124] The following is combined with Figures 3 to 30 , an embodiment of the balancing valve provided in this application is described.

[0125] refer to Figures 3 to 5 As shown, in some embodiments of the balancing valve provided in the present application, the balancing valve 10 includes a valve body 1, a first seal 2 and a second seal 3. The valve body 1 has a through first channel 11, and the first channel 11 is divided into a first part and a second part. The first seal 2 is located in the first channel 11, and the first seal 2 is movable relative to the valve body 1 to block or open the first part; the second seal 3 is located in the first channel 11, and the second seal 3 is movable relative to the valve body 1 to block or open the second part.

[0126] In the embodiment of the present application, the first channel in the valve body 1 includes a first part and a second part, and the first part and the second part are opened and closed respectively by the first seal 2 and the second seal 3. Moreover, the first seal 2 and the second seal 3 are movable relative to the valve body 1. When the pressures on the inner and outer sides of the balancing valve 10 are not equal, the first seal 2 and the second seal 3 achieve the purpose of opening or closing the first part and the second part by moving relative to the valve body 1, thereby achieving automatic opening and closing of the balancing valve 10, overcoming the problems of water vapor easily entering the valve body and causing insulation failure or short circuit failure in the normally open balancing valve in the related art.

[0127] In the embodiment of the present application, the balancing valve 10 has an intake state, an exhaust state and a closed state. In the intake state and the exhaust state, the first channel 11 is in a smooth state, but the airflow direction is different. In the closed state, the first channel 11 is in a closed state, and no gas flows inside and outside the balancing valve 10.

[0128] Wherein, in the intake state and the exhaust state, at least one of the first part and the second part is in an open state. In the closed state, both the first part and the second part are in a closed state.

[0129] For example, when the outer pressure of the first channel 11 is greater than the inner pressure, the outer pressure pushes at least one of the first seal 2 and the second seal 3 to move inward relative to the valve body 1 to open the first channel 11 inward, so that the balancing valve 10 enters the air intake state. At this time, the gas on the outside can enter the inside through the first channel 11 to achieve a balance between the internal and external pressures.

[0130] When the outer pressure of the first channel 11 is lower than the inner pressure, the inner pressure will push at least one of the first seal 2 and the second seal 3 to move outward to open the first channel 11 outward, so that the balancing valve 10 enters the exhaust state. At this time, the gas inside can be discharged to the outside through the first channel 11 to achieve a balance between the internal and external pressures.

[0131] When the outer pressure of the first channel 11 is equal to the inner pressure, the first seal 2 and the second seal 3 remain in the closed position or return from the open position to the closed position to close the first channel 11 and put the balancing valve 10 into the closed state.

[0132] In the embodiment of the present application, the balancing valve 10 has a closed state, an intake state and an exhaust state, that is, the balancing valve 10 is not a normally open structure. Compared with the normally open design, the opening time of the balancing valve 10 can be shortened, the sealing of the battery pack can be effectively improved, and the possibility of external water vapor entering the battery pack using the balancing valve 10 is reduced, thereby preventing insulation failure or short circuit failure of internal components of the battery pack.

[0133] like Figures 3 to 5 As shown, in some embodiments, the first sealing member 2 includes a first connecting portion 2a and a first movable portion 2b, the first connecting portion 2a is connected to the valve body 1, and the first movable portion 2b is configured to move to a blocking position under the action of a pressure difference to block the first part or to leave the blocking position under the action of a pressure difference to open the first part.

[0134] By setting the first movable part 2b, the first movable part 2b can be driven to move relative to the first connecting part 2a and the valve body 1 under the action of pressure difference, so as to realize the switching of the first movable part 2b between the blocking position of blocking the first part and the opening position of opening the first part.

[0135] There are many options for the movement of the first movable portion 2b relative to the valve body 1.

[0136] For example, in some embodiments, the first movable portion 2b is rotatably connected to the first connecting portion 2a. In this embodiment, the first movable portion 2b is switched between a blocking position for blocking the first part and an open position for opening the first part by rotating relative to the first connecting portion 2a.

[0137] For example, in other embodiments, the first movable portion 2b is integrally formed with the first connecting portion 2a, and the first movable portion 2b is made of a flexible material or an elastic material. In this embodiment, by making the first movable portion 2b of a flexible material or an elastic material, the material of the first movable portion 2b can be made softer or elastic, so that the first movable portion 2b can be bent or deformed under the action of a pressure difference, thereby changing its position relative to the first connecting portion 2a, thereby achieving the purpose of opening or closing the first portion.

[0138] like Figure 5 As shown, with reference to the direction of the diagram, for the first sealing member 2, when the upper pressure is greater than the lower pressure, the first movable portion 2b is pressed against the opening of the first portion under the action of the upper pressure, so that the first movable portion 2b closes the opening, thereby achieving the effect of blocking the first portion; and when the upper pressure is less than the lower pressure, the first movable portion 2b will bend downward under the action of the lower pressure, thereby opening the opening of the first portion, thereby achieving the effect of opening the first portion.

[0139] In some embodiments, the first movable portion 2b may be made of rubber material.

[0140] In some embodiments, the second sealing member 3 includes a second connecting portion 3a and a second movable portion 3b, the second connecting portion 3a is connected to the valve body 1, and the second movable portion 3b is configured to move to a blocking position under the action of a pressure difference to block the second part or to leave the blocking position under the action of a pressure difference to open the second part.

[0141] By setting the second movable part 3b, the second movable part 3b can be driven to move relative to the second connecting part 3a and the valve body 1 under the action of pressure difference, so as to realize the switching of the second movable part 3b between the blocking position blocking the second part and the opening position opening the second part.

[0142] There are many options for the second movable portion 3b to move relative to the valve body 1.

[0143] For example, in some embodiments, the second movable portion 3b is rotatably connected to the second connecting portion 3a. In this embodiment, the second movable portion 3b is switched between a blocking position for blocking the second part and an open position for opening the second part by rotating relative to the second connecting portion 3a.

[0144] For example, in some other embodiments, the second movable portion 3b is integrally formed with the second connecting portion 3a, and the second movable portion 3b is made of a flexible material or an elastic material. In this embodiment, by making the second movable portion 3b of a flexible material or an elastic material, the material of the second movable portion 3b can be made softer or elastic, so that the second movable portion 3b can be bent or deformed under the action of a pressure difference, thereby changing its position relative to the second connecting portion 3a, thereby achieving the purpose of opening or closing the second portion.

[0145] For the second seal 3, the sealing principle is similar to that of the first seal 2, but the direction is different. Figure 5 As shown, for the second sealing member 3, referring to the direction shown in the figure, when the pressure on the lower side is greater than the pressure on the upper side, the second movable portion 3b is tightly attached to the opening of the first portion under the action of the pressure on the lower side, so that the second movable portion 3b closes the opening, thereby achieving the effect of blocking the first portion; and when the pressure on the lower side is less than the pressure on the upper side, the second movable portion 3b will bend downward under the action of the pressure on the upper side, thereby opening the opening of the first portion, thereby achieving the effect of opening the first portion.

[0146] In some embodiments, the second movable portion 3b may be made of rubber material.

[0147] refer to Figures 6 to 8 As shown, in some embodiments, the balancing valve 10 also includes a first elastic member 4 and a second elastic member 5. The first elastic member 4 is connected to the first sealing member 2, and the first elastic member 4 is used to provide the first sealing member 2 with an elastic force to move along a first direction toward the position of blocking the first part, and the first direction is the extension direction of the first channel 11 at the first elastic member 4. The second elastic member 5 is connected to the second sealing member 3, and the second elastic member 5 is used to provide the second sealing member 3 with an elastic force to move along a direction opposite to the first direction toward the position of blocking the second part.

[0148] By providing the first elastic member 4 and the second elastic member 5, elastic force can be provided to the first sealing member 2 and the second sealing member 3 respectively, thereby enhancing the sealing effect.

[0149] In the embodiment of the present application, under the elastic force of the first elastic member 4 and the second elastic member 5, there is no pressure difference at the two ends of the first channel 11, that is, when the pressure difference is zero, the first seal 2 and the second seal 3 respectively block the first part and the second part under the action of the first elastic member 4 and the second elastic member 5, so that the first channel 11 is in a state where it cannot flow, and the balancing valve 10 enters a closed state. At this time, the external water vapor cannot enter the interior of the battery pack through the balancing valve 10, which can effectively protect the internal components of the battery pack and prevent component failure or insulation failure, causing a short circuit fault. When there is a pressure difference at the two ends of the first channel 11, that is, when the pressure difference is not zero, the balancing valve 10 can automatically open inward or outward according to the pressure relationship at the two ends of the first channel 11, so that the balancing valve 10 enters an intake state or an exhaust state.

[0150] The first elastic member 4 and the second elastic member 5 can be made of rubber or springs.

[0151] In the embodiment of the present application, the component connected to the first elastic member 4 can be directly connected to the first elastic member 4 or can abut against the first elastic member 4. The component connected to the second elastic member 5 can be directly connected to the second elastic member 5 or can abut against the second elastic member 5.

[0152] like Figures 6 to 8 As shown, in some embodiments, the first elastic member 4 and the second elastic member 5 do not overlap in the first direction. In this embodiment, the first elastic member 4 and the second elastic member 5 are respectively located on both sides of the support member 101 of the valve body 1, and the first part and the second part are relatively independent and arranged in a direction perpendicular to the first direction.

[0153] Furthermore, the present application also found that the capacity of the battery pack is positively correlated with the volume of the battery pack. When the capacity of the battery pack increases, the volume of the battery pack will also increase. The volume of each component of the battery pack determines the overall volume of the battery pack. When the capacity of the battery pack is equal, if the volume of each component of the battery pack is reduced, the overall volume of the battery pack will also be reduced, so that a battery pack with a larger capacity can be installed in the limited storage space in the car, providing a more durable power supply for the car.

[0154] In an embodiment where two springs for providing elastic force are respectively arranged on both sides of the first seal and have no overlapping parts in the first direction, the length of the balancing valve 10 along the first direction will be larger, so the volume of the balancing valve 10 is larger, which will increase the overall volume of the battery pack 100a, which is not conducive to increasing the total capacity of the battery pack 100a within a limited space.

[0155] To this end, in some embodiments provided in the present application, the first elastic member 4 and the second elastic member 5 at least partially overlap in the first direction. This can effectively shorten the length of the balancing valve along the first direction, reduce the volume of the balancing valve, and further reduce the overall volume of the battery pack, thereby achieving the purpose of increasing the total capacity of the battery pack within a limited space.

[0156] Compared with the related art in which two springs have no overlapping parts in the first direction, the first elastic member 4 and the second elastic member 5 at least partially overlap in the first direction in the embodiment of the present application, which can reduce the overall length of the first elastic member 4 and the second elastic member 5 in the first direction, thereby facilitating reducing the volume of the balancing valve 10 and reducing the total volume of the battery pack using the balancing valve 10.

[0157] In some embodiments, the first elastic member 4 and the second elastic member 5 at least partially overlap in the first direction.

[0158] like Figures 9 to 22 As shown, in some embodiments, the first elastic member 4 and the second elastic member 5 completely overlap in the first direction.

[0159] like Fig.23 and 24 As shown, in some other embodiments, the first elastic member 4 and the second elastic member 5 partially overlap in the first direction.

[0160] Compared with the technical solution in which the first elastic member 4 and the second elastic member 5 partially overlap in the first direction, the technical solution in which the first elastic member 4 and the second elastic member 5 completely overlap in the first direction can further reduce the overall length of the first elastic member 4 and the second elastic member 5 in the first direction, thereby further reducing the volume of the balancing valve 10.

[0161] like Figures 9 to 22 As shown, in some embodiments, one end of the first elastic member 4 is connected to the first seal 2, and the other end of the first elastic member 4 is located on one side of the first seal 2 in the first direction; one end of the second elastic member 5 is connected to the second seal 3, and the other end of the second elastic member 5 is located on the same side of the second seal 3 in the first direction.

[0162] like Fig.23 and 24 As shown, in other embodiments, one end of the first elastic member 4 is connected to the first sealing member 2, and the other end of the first elastic member 4 is located on one side of the first sealing member 2 in the first direction; one end of the second elastic member 5 is connected to the second sealing member 3, and the other end of the second elastic member 5 is located on the other side of the second sealing member 3 in the first direction.

[0163] Regardless of whether the first elastic member 4 and the second elastic member 5 are arranged on the same side of the first sealing member 2 or on both sides of the first sealing member 2, in the first direction, the first elastic member 4 and the second elastic member 5 overlap, which can effectively shorten the length of the first elastic member 4 and the second elastic member 5 in the first direction, thereby reducing the volume of the balancing valve 10.

[0164] In some embodiments, there is no space between the first part and the second part. This embodiment can save spacers, reduce the number of parts, and simplify the structure of the balancing valve.

[0165] like Figures 9 to 24 As shown, in some embodiments, the first part surrounds the second part, a first through hole is formed in the middle of the first seal 2, the second seal 3 passes through the first through hole, the first part is formed between the first seal 2 and the valve body 1, and the second part is formed between the second seal 3 and the first seal 2, the first seal 2 is sealingly connected to the valve body 1 to seal the first part; the second seal 3 is sealingly connected to the first seal 2 to seal the second part.

[0166] like Figures 26 to 30 As shown, in some embodiments, the first part and the second part are distributed in a direction perpendicular to the first direction, the first part is formed between the valve body 1 and the first seal 2, and the second part is formed between the valve body 1 and the second seal 3, the first seal 2 is sealingly connected to the valve body 1 and the second seal 3 to seal the first part; the second seal 3 is sealingly connected to the valve body 1 and the first seal 2 to seal the second part.

[0167] In some embodiments, the balancing valve 10 further includes a separator connected to the valve body 1 . The separator is located in the first channel 11 and separates the first channel 11 into a first part and a second part.

[0168] By providing the separator, the first part and the second part can be divided more clearly, thereby avoiding accidental connection between the first part and the second part.

[0169] The number of partitions can be set as needed. For example, one partition can be set to separate the preset area in the first channel 11 into a first part and a second part. For another example, two partitions can be set. In the preset area of ​​the first channel 11, the first part is separated by the first partition, and the second part is separated by the second partition.

[0170] There are also many options for the shape of the separator.

[0171] In some embodiments, the separator is annular, a first part is formed between the separator and the valve body 1, a second part is formed inside the separator, and the first part surrounds the second part; the first seal 2 is annular; the first seal 2 is sealingly connected to the valve body 1 and the separator to seal the first part; the second seal 3 is sealingly connected to the separator to seal the second part.

[0172] In some embodiments, the partition is plate-shaped, a first part is formed between one side of the partition and the valve body 1, and a second part is formed between the other side of the partition and the valve body 1, and the first part and the second part are distributed in a direction vertical to the first direction; the first sealing member 2 is sealingly connected to the valve body 1 and the partition to seal the first part; the second sealing member 3 is sealingly connected to the valve body 1 and the partition to seal the second part.

[0173] In order to achieve complete overlap of the first elastic member 4 and the second elastic member 5 in the first direction, in some embodiments, the first elastic member 4 is sleeved on the outside of the second elastic member 5 .

[0174] By adopting the method of sleeve-mounting the first elastic member 4 on the outside of the second elastic member 5, the first elastic member 4 and the second elastic member 5 can be completely overlapped in the first direction, so that the length of the first elastic member 4 and the second elastic member 5 in the first direction is the length of the first elastic member 4 and the second elastic member 5 with a longer length along the first direction, thereby effectively shortening the overall length of the first elastic member 4 and the second elastic member 5 and reducing the occupied space of the balancing valve 10.

[0175] In some embodiments, the first elastic member 4 is located on one side of the vertical direction of the first direction, and the second elastic member 5 is located on the other side of the vertical direction of the first direction. In this embodiment, the first elastic member 4 and the second elastic member 5 are not arranged in a surrounding manner, but are arranged in a vertical direction of the first direction.

[0176] In some embodiments, a sealing surface 12 is provided on the wall of the first channel 11 , and the first sealing member 2 abuts against the sealing surface 12 under the elastic force of the first elastic member 4 to seal the first channel 11 .

[0177] By providing a sealing surface 12 on the wall surface of the first channel 11, the sealing of the first channel 11 can be achieved in cooperation with the first sealing member 2. The sealing surface 12 can block the movement of the first sealing member 2 relative to the valve body 1.

[0178] There are many options for setting the sealing surface 12. For example, a convex portion can be set on the wall surface of the first channel 11, and the sealing surface 12 is formed on the convex portion.

[0179] In some embodiments, the sealing surface 12 is perpendicular to the first direction to block the movement of the first sealing member 2 relative to the valve body 1. At the same time, the sealing surface 12 and the first sealing member 2 can achieve close contact to achieve the effect of blocking the first channel 11.

[0180] In some embodiments, the second sealing member 3 includes a sealing body 32 and a third sealing portion 33 and a first limiting member 34 respectively arranged at both ends of the sealing body 32, the sealing body 32 passes through the first through hole, the third sealing portion 33 is used to seal the first through hole, the third sealing portion 33 and the first limiting member 34 are respectively located on both sides of the first sealing member 2, the second elastic member 5 is mounted on the outside of the sealing body 32, and the two ends of the second elastic member 5 are respectively connected to the first sealing member 2 and the first limiting member 34.

[0181] In this embodiment, the first sealing member 2 and the first limiting member 34 limit the two ends of the second elastic member 5 respectively.

[0182] In some embodiments, the sealing body 32 is provided with a plurality of long grooves 31 arranged at intervals along the circumferential direction, and the long grooves 31 extend along the first direction to form the second portion.

[0183] By providing the long groove 31 in the sealing body 32 , the long groove 31 can be opened when the second sealing member 3 and the first sealing member 2 move relative to each other, and the long groove 31 can be closed when the third sealing portion 33 of the second sealing member 3 contacts the first sealing member 2 .

[0184] The size of the third sealing portion 33 is larger than the size of the mounting hole on the first sealing member 2 , so that when the third sealing portion 33 contacts the first sealing member 2 , the mounting hole and the long groove 31 between the first sealing member 2 and the second sealing member 3 can be sealed.

[0185] By providing the third sealing portion 33, the long groove 31 can be sealed in cooperation with the first sealing member 2; and after the second sealing member 3 and the first sealing member 2 move relative to each other, the third sealing portion 33 leaves the first sealing member 2, and the long groove 31 can be opened. By providing the first limiting member 34, the movement of the second sealing member 3 can be limited to prevent the second sealing member 3 from being separated from the first sealing member 2.

[0186] In some embodiments, the first limiting member 34 is provided with a first limiting portion, and the first limiting portion is configured to limit the second elastic member 5 in a direction perpendicular to the first direction.

[0187] By setting the first limiting portion, the second elastic member 5 can be limited in a direction perpendicular to the first direction, and the deformation direction of the second elastic member 5 can be restricted to prevent the deformation and dislocation of the second elastic member 5 from affecting the sealing effect of the third sealing portion 33 of the second sealing member 3 on the long groove 31.

[0188] There are many options for the structure of the first limiting portion.

[0189] For example, Figure 5 As shown, in some embodiments, the first limiting portion includes a second limiting groove 37 opening toward the third sealing portion 33, and the second elastic member 5 is partially embedded in the second limiting groove 37 to limit the second elastic member 5 in a direction perpendicular to the first direction through the groove wall of the second limiting groove 37.

[0190] The groove wall of the second limiting groove 37 extends along the circumference of the valve body 1. In the direction perpendicular to the first direction, the deformation of the second elastic member 5 is limited by the groove wall of the second limiting groove 37. Since the second limiting groove 37 has a certain depth, it has a guiding and limiting effect on the deformation direction of the second elastic member 5, thereby preventing the second elastic member 5 from affecting exhaust or air intake due to deformation and dislocation.

[0191] At the same time, the second elastic member 5 is partially accommodated in the second limiting groove 37 , so as to achieve a stable limiting effect on the second elastic member 5 and prevent the second elastic member 5 from being separated from the first limiting member 34 .

[0192] For example, Figure 8 As shown, the first limiting portion includes a plurality of second protrusions 38 disposed on the first limiting member 34 and arranged at intervals along the circumference of the valve body 1. A circular limited space can be formed around the axis of the valve body 1 by the plurality of second protrusions 38, and the deformation of the second elastic member 5 is limited within the limited space.

[0193] In some embodiments, the third sealing portion 33 is integrally formed with the sealing body 32 .

[0194] By forming the third sealing part 33 and the sealing body 32 as an integral part, the steps of connecting the third sealing part 33 and the sealing body 32 can be reduced, the assembly operation of the balancing valve can be simplified, and the assembly efficiency can be improved. Moreover, the relative stability of the third sealing part 33 and the sealing body 32 can be improved, and the overall strength of the second sealing member 3 can be improved.

[0195] In some embodiments, the sealing body 32 is provided with a card slot 35 , and the first limiting member 34 is disposed in the card slot 35 to achieve a card-joined connection between the sealing body 32 and the first limiting member 34 .

[0196] By providing the clamping groove 35 , the first position limiting member 34 can be fixed on the sealing body 32 . The clamping groove 35 extends in the circumferential direction, and the first position limiting member 34 is embedded in the clamping groove 35 .

[0197] In some embodiments, the second sealing member 3 further includes a head 36, and the head 36 is used to axially limit the first limiting member 34 to prevent the first limiting member 34 from moving in the axial direction.

[0198] In some embodiments, the sealing body 32 is made of a material that is deformable by heat. Before the first stopper 34 is installed, the head 36 is a structure of equal diameter along the axial direction. After the first stopper 34 is mounted on the sealing body 32, the head 36 is heated to melt it, and then the head 36 is hot-pressed into a mushroom head shape to limit the first stopper 34, and the position where the first stopper 34 is mounted forms a slot 35.

[0199] In some embodiments, the first sealing part 2 includes a first sealing part 21 and a second sealing part 22, the hardness of the first sealing part 21 is greater than the hardness of the second sealing part 22, the first elastic part 4 is connected to the first sealing part 21, and the second sealing part 22 is arranged on the side of the first sealing part 21 away from the first elastic part 4.

[0200] By setting the hardness of the first sealing part 21 to be greater than the hardness of the second sealing part 22, the second sealing part 22 with smaller hardness can contact the sealing surface 12, thereby improving the sealing effect on the first channel 11; if the hardness of the first sealing part 21 is greater, it can provide more reliable support for the first elastic part 4 and the second elastic part 5, preventing the first sealing part 21 from being subjected to greater pressure due to excessive internal and external pressure difference, or even damaging the first sealing part 21, thereby affecting the deformation of the first elastic part 4 and the second elastic part 5, and affecting the size of the set pressure of the intake and exhaust.

[0201] In some embodiments, the first sealing portion 21 is made of a hard material such as metal or plastic, and the second sealing portion 22 is made of a soft material such as rubber or silicone.

[0202] The hardness of the first sealing part 21 and the second sealing part 22 can be measured according to GB / T531-1999. Specifically, for the first sealing part 21, the hardness of the side away from the second sealing part 22 can be measured; for the second sealing part 22, the hardness of the side away from the first sealing part 21 can be measured.

[0203] In some embodiments, the wall of the first channel 11 is provided with at least two first protrusions 13 spaced apart along the circumferential direction, a gap 14 is provided between the first seal 2 and the first protrusion 13 , and the gap 14 between two adjacent first protrusions 13 is connected to the first channel 11 .

[0204] By providing the first protrusions 13 , a gap 14 can be formed between two adjacent first protrusions 13 . After the first seal 2 leaves the sealing surface 12 , the first channel 11 can be connected through the gap 14 , thereby enabling gas to flow in the first channel 11 .

[0205] At the same time, there is a gap between the first seal 2 and the first protrusion 13, which can prevent the first protrusion 13 from blocking the movement of the first seal 2 in the first channel 11, thereby avoiding wear between the first seal 2 and the first protrusion 13 during movement relative to the valve body 1.

[0206] In some embodiments, a blocking member 15 is provided in the first channel 11 , and the blocking member 15 is disposed on a side of the first sealing member 2 away from the second limiting member 6 to limit the movement range of the second sealing member 3 in a direction away from the first sealing member 2 .

[0207] By providing the blocking member 15 , the movement of the second sealing member 3 can be limited to prevent the second sealing member 3 from moving too far away from the second limiting member 6 and moving out of the first channel 11 , thereby causing a malfunction of the balancing valve 10 .

[0208] In some embodiments, the blocking member 15 is installed on the wall surface of the first channel 11 , and the blocking member 15 is provided with a second through hole 16 communicating with the first channel 11 .

[0209] The second through hole 16 can be provided to prevent the blocking member 15 from blocking the first channel 11 and affecting exhaust and intake.

[0210] In some embodiments, the valve body 1 includes a valve body and a second limiter 6, the first channel 11 is disposed in the valve body, the second limiter 6 is connected to the valve body, and the second limiter 6 is configured to limit the first elastic member 4 in a first direction.

[0211] By providing the second limiting member 6 , a space for limiting the first sealing member 2 and the first elastic member 4 can be defined in the first channel 11 together with the sealing surface 12 , and the first sealing member 2 and the second limiting member 6 limit the two ends of the first elastic member 4 respectively.

[0212] In some embodiments, the second limiting member 6 is provided with a second limiting portion, and the second limiting portion is configured to limit the first elastic member 4 in a direction perpendicular to the first direction.

[0213] By setting a second limiting portion, the first elastic member 4 can be limited in a direction perpendicular to the first direction to guide the deformation of the first elastic member 4 and prevent the first sealing member 2 from failing in its sealing function on the first channel 11 due to misalignment caused by the deformation of the first elastic member 4.

[0214] There are many options for the specific structural form of the second limiting portion.

[0215] For example, Fig.12 and Fig.13As shown, in some embodiments, the second limiting portion includes a first limiting groove 61 opening toward the first sealing member 2, and the first elastic member 4 is partially embedded in the first limiting groove 61 to limit the first elastic member 4 in a direction perpendicular to the first direction through the groove wall of the first limiting groove 61.

[0216] The groove wall of the first limiting groove 61 extends along the circumference of the valve body 1. In the direction perpendicular to the first direction, the deformation of the first elastic member 4 is limited by the groove wall of the first limiting groove 61. Since the first limiting groove 61 has a certain depth, it has a guiding and limiting effect on the deformation direction of the first elastic member 4, thereby preventing the first elastic member 4 from affecting exhaust or intake due to deformation and dislocation.

[0217] At the same time, partially accommodating the first elastic member 4 in the first limiting groove 61 can achieve a stable limiting effect on the first elastic member 4 and prevent the first elastic member 4 from being separated from the second limiting member 6 .

[0218] For example, Fig.16 As shown, the second limiting portion includes a plurality of third protrusions 62 disposed on the second limiting member 6 and arranged at intervals along the circumference of the valve body 1. A circular limited space can be formed around the axis of the valve body 1 by the plurality of third protrusions 62, and the deformation of the first elastic member 4 is limited within the limited space.

[0219] In some embodiments, a blocking member 15 is provided on the wall of the first channel 11, and the blocking member 15 is arranged on the side of the second seal 3 away from the second limit member 6 to limit the movement range of the second seal 3 in the direction away from the second limit member 6, and the blocking member 15 is provided with a second through hole 16 connected to the first channel 11.

[0220] In some embodiments, the balancing valve 10 further includes a waterproof and breathable membrane 7 , and the waterproof and breathable membrane 7 is disposed at an end close to the first channel 11 and away from the second limiting member 6 .

[0221] The waterproof breathable membrane 7 allows gas to pass through, but water vapor cannot pass through. By setting the waterproof breathable membrane 7, it can play a moisture-proof role. Even if the balance valve 10 is in the air intake or exhaust state, it can prevent water vapor from entering the interior of the battery pack and generating condensation, which in turn causes a series of component failures, and even causes insulation failure or short circuit failure, posing a great threat to the personal and property safety of the occupants.

[0222] In some embodiments, threads are provided on the outer circumference of the valve body 1. By providing threads on the outer circumference of the valve body 1, the balancing valve 10 can be installed at a position requiring air permeability by means of threaded connection.

[0223] In some embodiments, the balancing valve 10 further includes a valve cover 8 , which is disposed at an end of the first channel 11 away from the second stopper 6 , and the valve cover 8 is configured to connect the first channel 11 with external gas.

[0224] The valve cover 8 can effectively protect the components in the valve body 1 and prevent dust. The valve cover 8 is configured to connect the first channel 11 to the outside air, which can prevent the valve cover 8 from sealing the first channel 11 and affecting the airflow connection inside and outside the balancing valve 10.

[0225] The following is combined with Figures 3 to 30 , the structure and working process of the balancing valve embodiment provided in this application are explained.

[0226] In such Figures 3 to 5 In the first embodiment shown, the balancing valve 10 includes a valve body 1 , a first sealing member 2 , a second sealing member 3 , a second stopper 6 , a waterproof breathable membrane 7 , a valve cover 8 and a third sealing member 9 .

[0227] The valve body 1 is cylindrical in shape, with the diameter of the head of the valve body 1 being larger than the diameter of the body. The valve body 1 is a hollow structure. A first through passage 11 is provided in the valve body 1.

[0228] The balancing valve 10 further includes an annular first partition 113 and a second partition 114 , which respectively separate a first chamber 111 and a second chamber 112 in the first channel 11 , wherein the first chamber 111 forms the first part and the second chamber 112 forms the second part.

[0229] The valve body 1 comprises a support member 101 arranged in the first channel 11 , and a first hanging portion 102 and a second hanging portion 103 are respectively provided on two sides of the support member 101 along a first direction.

[0230] The number of the first hanging parts 102 and the second hanging parts 103 can be flexibly set as needed. In this embodiment, the number of the first hanging parts 102 and the second hanging parts 103 are both three.

[0231] The first sealing member 2 includes a first connecting portion 2a and a first movable portion 2b, which are integrally formed and made of rubber material. The first connecting portion 2a is provided with a first connecting hole, and the first connecting portion 2a is sleeved on the first hanging portion 102 through the first connecting hole, and the first movable portion 2b is sealed at the port of the first cavity 111. The second sealing member 3 includes a second connecting portion 2a and a second movable portion 2b, which are integrally formed and made of rubber material. The second connecting portion 3a is provided with a second connecting hole, and the second connecting portion 3a is sleeved on the second hanging portion 103 through the second connecting hole, and the second movable portion 3b is sealed at the port of the second cavity 112.

[0232] The balancing valve 10 further includes a first fixing member 104 and a second fixing member 105. After the first sealing member 2 is hung on the first hanging portion 102 through the first connecting hole, the first fixing member 104 is installed on the side of the support member 101 provided with the first sealing member 2, so as to keep the first connecting portion 2a and the first hanging portion 102 relatively fixed in the first direction. After the second sealing member 3 is hung on the second hanging portion 103 through the second connecting hole, the second fixing member 105 is installed on the side of the support member 101 provided with the second sealing member 3, so as to keep the second connecting portion 3a and the second hanging portion 103 relatively fixed in the first direction.

[0233] The waterproof breathable membrane 7 is a circular sealing membrane. The waterproof breathable membrane 7 is sealed at the second end of the first channel 11 away from the second limiter 6 to prevent water vapor from entering. The valve cover 8 is a circular cover. The third sealing member 9 is a circular structure, and the third sealing member 9 is installed in the limiter groove of the valve body 1 to seal the installation position of the valve body 1.

[0234] The working principle of the balancing valve 10 is:

[0235] like Figure 4 and Figure 5 As shown, with the side where the valve cover 8 is located as the outer side and the side where the second stopper 6 is located as the inner side as a reference, when the pressures on the inner and outer sides of the balancing valve 10 are equal, the first sealing member 2 and the second sealing member 3 are in a natural state, respectively blocking the ports of the first cavity 111 and the second cavity 112, so that both the first part and the second part are in a blocked state. At this time, the balancing valve 10 is in a closed state;

[0236] When the pressure inside the balancing valve 10 is greater than the pressure outside, the internal gas pushes the first sealing member 2 to open outward to open the first part; the internal gas also pushes the second sealing member 3 to block the port of the second chamber 112 to block the second part. At this time, the balancing valve 10 enters the exhaust state;

[0237] When the inner pressure of the balancing valve 10 is lower than the outer pressure, the outer gas pushes the first sealing member 2 to seal the port of the first cavity 111 to seal the first part; the external gas also pushes the second sealing member 3 to open inward to open the second part. At this time, the balancing valve 10 enters the air intake state.

[0238] In such Figures 6 to 8 In the second embodiment shown, most structures of the valve body 1, the second stopper 6, the waterproof breathable membrane 7, the valve cover 8 and the third sealing member 9 are the same as those of the first embodiment.

[0239] The second embodiment is mainly different from the first embodiment in the structures of the first sealing member 2 and the second sealing member 3 , and further includes a first elastic member 4 and a second elastic member 5 .

[0240] A support member 101 is provided in the first channel 11 of the valve body 1. The first sealing member 2 includes a first sub-seal and a second sub-seal, the first sub-seal includes a first body 201, a first blocking portion 202 and a second blocking portion 203, and the second sub-seal includes a second body 204, a third blocking portion 205 and a fourth blocking portion 206. The second sealing member 3 includes a fourth sealing portion 301 and a fifth sealing portion 302.

[0241] The support member 101 is provided with two through holes, the first body 201 is inserted into one through hole, the first blocking portion 202 and the second blocking portion 203 are respectively located on both sides of the support member 101; the second body 204 is inserted into the other through hole, the third blocking portion 205 and the fourth blocking portion 206 are respectively located on both sides of the support member 101. The fourth sealing portion 301 is arranged between the first blocking portion 202 and the support member 101, and is used to block the first cavity 111. The fifth sealing portion 302 is arranged between the third blocking portion 205 and the support member 101, and is used to block the second cavity 112. The first elastic member 4 is arranged between one side of the support member 101 and the second blocking portion 203. The second elastic member 5 is arranged between the other side of the support member 101 and the fourth blocking portion 206.

[0242] The working principle of the balancing valve 10 is:

[0243] like Figure 7 and Figure 8 As shown, with the side where the valve cover 8 is located as the outer side and the side where the second limiter 6 is located as the inner side as a reference, when the pressures on the inner and outer sides of the balancing valve 10 are equal, the first elastic member 4 and the second elastic member 5 are both in a natural state, and the fourth sealing portion 301 and the fifth sealing portion 302 are respectively blocked at the ports of the first cavity 111 and the second cavity 112, so that the first part and the second part are both in a blocked state. At this time, the balancing valve 10 is in a closed state;

[0244] When the inner pressure of the balancing valve 10 is greater than the outer pressure, the internal gas pushes the second blocking portion 203 of the first sealing member 2 to move outward, the first elastic member 4 is compressed, and as the fourth sealing portion 301 and the first blocking portion 202 move outward, the port of the first cavity 111 is opened to open the first part; the internal gas also pushes the third blocking portion 205 and the fifth sealing portion 302 of the first sealing member 2 to move outward, so that the fifth sealing portion 302 is close to the support member 101, blocking the port of the second cavity 112, and blocking the second part. At this time, the balancing valve 10 enters the exhaust state;

[0245] When the inner pressure of the balancing valve 10 is lower than the outer pressure, the outer gas pushes the fourth blocking part 206 of the first sealing member 2 to move inward, and the second elastic member 5 is compressed. As the fifth sealing member 302 and the third blocking part 205 move inward, the port of the second cavity 112 opens to open the second part. The internal gas also pushes the first blocking part 202 and the fourth sealing part 301 of the first sealing member 2 to move inward, so that the fourth sealing part 301 is close to the support member 101, blocking the port of the first cavity 111 to block the first part. At this time, the balancing valve 10 enters the air intake state.

[0246] In such Figures 9 to 22 In the third embodiment shown, the balancing valve 10 includes a valve body 1, a first sealing member 2, a second sealing member 3, a first elastic member 4, a second elastic member 5, a second limit member 6, a waterproof breathable membrane 7, a valve cover 8 and a third sealing member 9.

[0247] like Fig. 9 As shown, the valve body 1 is cylindrical in shape as a whole, and the diameter of the head of the valve body 1 is larger than the diameter of the body. The valve body 1 is a hollow structure. A through first passage 11 is provided in the valve body 1. The first sealing member 2 includes a first sealing portion 21 and a second sealing portion 22, both of which are circular, and a first through hole is provided at the center of the first sealing portion 21, and a second through hole is provided at the center of the second sealing portion 22. The second sealing member 3 includes a long groove 31, a sealing body 32, a third sealing portion 33 and a first stopper 34. The sealing body 32 is cylindrical in shape as a whole, and the third sealing portion 33 is circular. The first stopper 34 is also cylindrical in shape. A through hole is provided at the center of the first stopper 34, and a card slot 35 is provided on the sealing body 32, and the first stopper 34 is sleeved in the card slot 35 of the sealing body 32.

[0248] The diameter of the first elastic member 4 is greater than the diameter of the second elastic member 5. The center of the second stopper 6 is a hollow structure. The waterproof breathable membrane 7 is a circular sealing membrane. The waterproof breathable membrane 7 is sealed at the second end of the first channel 11 away from the second stopper 6 to prevent water vapor from entering. The valve cover 8 is a circular cover. The third sealing member 9 is a circular structure, and the third sealing member 9 is installed in the stopper groove of the valve body 1 to seal the installation position of the valve body 1.

[0249] like Figures 10 to 12 As shown, the valve body 1 is provided with a through first passage 11 , the lower end in the direction shown is the first end of the valve body 1 , and the upper end in the direction shown is the second end of the valve body 1 .

[0250] Inside the valve body 1, a sealing surface 12 is provided on the wall surface of the first channel 11, and the sealing surface 12 extends in the circumferential direction. The second stopper 6 is installed at the first end of the first channel 11, and the first sealing portion 21, the second sealing portion 22, the first elastic member 4, and the second elastic member 5 are all arranged in the space defined by the sealing surface 12 and the second stopper 6.

[0251] The hardness of the first sealing part 21 is greater than that of the second sealing part 22, and the second sealing part 22 is closer to the sealing surface 12 than the first sealing part 21. The first elastic member 4 and the second elastic member 5 are both against the first sealing part 21. The sealing body 32 passes through the through holes on the first sealing part 21 and the second sealing part 22, and extends into the space defined by the sealing surface 12 and the second limiting member 6. The third sealing part 33 is located on the side of the second sealing part 22 away from the first sealing part 21. The first limiting member 34 is installed at one end of the sealing body 32 away from the third sealing part 33. The two ends of the first elastic member 4 are in contact with the first sealing part 21 and the second limiting member 6 respectively. The two ends of the second elastic member 5 are in contact with the first sealing part 21 and the first limiting member 34 respectively.

[0252] like Fig.13 As shown, the second limiting member 6 is provided with a first limiting groove 61, and the first elastic member 4 is partially embedded in the first limiting groove 61. The opening area of ​​the first limiting groove 61 is larger than the area of ​​the through hole on the second limiting member 6, so as to form a groove bottom for limiting the first elastic member 4. The first limiting member 34 is provided with a second limiting groove 37 with an opening toward the third sealing portion 33, and the second elastic member 5 is partially embedded in the second limiting groove 37.

[0253] In this embodiment, the first elastic member 4 and the second elastic member 5 are located on the same side of the first sealing member 2. Both ends of the first elastic member 4 are in contact with the first sealing portion 21 and the second stopper 6 respectively. Both ends of the second elastic member 5 are in contact with the first sealing portion 21 and the first stopper 34 respectively.

[0254] like Fig.14 As shown, the sealing body 32 is cylindrical, and is provided with four long grooves 31 arranged at intervals along the circumferential direction, and the long grooves 31 extend along the axial direction. The sealing body 32 is provided with a slot 35 for axially limiting the first limiting member 34. The head 36 of the sealing body 32 is in the shape of a mushroom head, which can limit the first limiting member 34 axially.

[0255] like Fig.15 As shown, the first limiting member 34 is provided with a plurality of second protrusions 38 spaced apart in the axial direction. The plurality of second protrusions 38 can replace the second limiting grooves 37 to limit the second elastic member 5 .

[0256] like Fig.16As shown, the second limiting member 6 is provided with a plurality of third protrusions 62 arranged at intervals along the circumferential direction. The plurality of third protrusions 62 can replace the first limiting grooves 61 to limit the first elastic member 4 .

[0257] like Figures 17 to 19 As shown, the wall surface of the first channel 11 is provided with a first protrusion 13. The first protrusion 13 is located in the space limited by the sealing surface 12 and the second stopper 6. The three first protrusions 13 are arranged at intervals along the circumferential direction, and a gap 14 is formed between two adjacent first protrusions 13. The gap 14 makes the first channel 11 a vertically through channel. There is a gap between the first sealing member 2 and the first protrusion 13, which can prevent the first sealing member 2 and the first protrusion 13 from being worn when the first sealing member 2 moves relative to the valve body 1.

[0258] like Fig. 20 As shown, a blocking member 15 is provided on the wall of the first channel 11, and the blocking member 15 is provided with three through holes and second through holes 16 arranged at intervals in the circumferential direction. By providing the second through holes 16, the first channel 11 can be made into a vertically penetrating channel. The blocking member 15 can prevent the second sealing member 3 from passing through the second end of the first channel 11, causing the failure of the balancing valve.

[0259] The assembly steps of the balancing valve 10 provided in this embodiment may be:

[0260] like Fig. 9 As shown, the second sealing part 22, the first sealing part 21 and the second elastic member 5 are first installed on the sealing body 32, and then the first stopper 34 is installed on the sealing body 32, and then the head 36 of the sealing body 32 is melted by a hot riveting process to form a mushroom-shaped head 36, so that the second sealing part 22, the first sealing part 21, the second elastic member 5 and the second sealing part 3 form a whole;

[0261] Then, the whole is placed into the interior of the valve body 1 from the first end of the valve body 1;

[0262] Next, the first elastic member 4 is mounted on the outside of the second elastic member 5, and the second limit member 6 is used to fix the above-mentioned whole and the first elastic member 4 inside the valve body 1. The second limit member 6 presses the second sealing portion 22 tightly against the sealing surface 12 to achieve initial sealing. At this time, the balancing valve 10 is in a closed state.

[0263] The second limit member 6 and the inner wall of the valve body 1 can be fixed to each other by means of heat riveting, interference fit or bayonet.

[0264] The working principle of the balancing valve 10 is:

[0265] like Fig.12As shown, with the side where the valve cover 8 is located as the outer side and the side where the second limiter 6 is located as the inner side as a reference, when the pressures on the inner and outer sides of the balancing valve 10 are equal, the balancing valve 10 is in a closed state;

[0266] like Fig.21 As shown, when the inner pressure of the balancing valve 10 is greater than the outer pressure, the internal gas pushes the sealing body 32 to move outward, the second elastic member 5 is compressed, the third sealing portion 33 leaves the second sealing portion 22, the gas escapes through the long groove 31, and the balancing valve 10 enters the exhaust state;

[0267] like Fig. 22 As shown, when the inner pressure of the balancing valve 10 is less than the outer pressure, the external body pushes the second sealing member 3 to move inward, the third sealing portion 33 drives the first sealing member 2 to move inward as a whole, the first elastic member 4 is compressed, the second sealing portion 22 leaves the sealing surface 12, the gas enters the battery pack through the gap 14, and the balancing valve 10 enters the air intake state.

[0268] In such Fig.23 and Fig.24 The fourth embodiment shown is different from the third embodiment mainly in that, in this embodiment, the first elastic member 4 and the second elastic member 5 of the valve body 1 are located on different sides of the first sealing member 2 .

[0269] The two ends of the first elastic member 4 are in contact with the first sealing portion 21 and the second stopper 6, respectively. The second sealing member 3 includes a sealing body 32 and a third sealing portion 33. The sealing body 32 is provided with a containing space. A sleeve portion 17 is provided below the blocking member 15. One end of the second elastic member 5 is sleeved on the outer periphery of the sleeve portion 17 and abuts against or is connected to the lower side of the blocking member 15, and the other end is located in the containing space of the sealing body 32. The sealing body 32 passes through the through hole on the first sealing member 2 and enters the space defined by the first sealing member 2 and the second stopper 6. Therefore, although the first elastic member 4 and the second elastic member 5 are located on different sides of the first sealing member 2, in the first direction, the first elastic member 4 and the second elastic member 5 have an overlapping portion. Compared with the technical solution in which the two elastic members do not overlap in the first direction, this embodiment has the advantage of shortening the length of the balancing valve 10 along the first direction.

[0270] In such Figures 25 to 27 In the fifth embodiment shown, the structure is basically the same as Figures 6 to 8The second embodiment shown is the same, and the main difference is that the support member 101 in the valve body 1 includes a first support portion 106, a second support portion 107, and a third support portion 108 connected between the first support portion 106 and the second support portion 107. The third support portion 108 is arranged obliquely relative to the first direction, so that the first support portion 106 and the second support portion 107 are misaligned in the first direction, so that the first elastic member 4 and the second elastic member 5 have an overlapping portion in the first direction, so as to shorten the total length of the balancing valve 10 in the first direction.

[0271] In the fifth embodiment, the first elastic member 4 and the second elastic member 5 are respectively disposed on two sides of the supporting member 101 .

[0272] In such Figures 28 to 30 In the sixth embodiment shown, the structure is different from that of the second embodiment mainly in that the second sub-sealing member includes a second body 204, a third blocking portion 205 and an extension portion 207, the second body 204 is inserted into another through hole of the support member 101, the fifth sealing portion 302 is arranged between the lower side of the support member 101 and the third blocking portion 205, and the extension portion 207 is arranged on the side of the third blocking portion 205 away from the second body 204. One end of the second elastic member 5 is sleeved on the extension portion 207, and the other end is abutted against or connected to the fifth blocking portion 109 arranged in the first channel 11. In this embodiment, the first elastic member 4 and the second elastic member 5 are arranged on the same side of the support member 101.

[0273] The above description of various embodiments tends to emphasize the differences between the various embodiments. The same or similar aspects can be referenced to each other, and for the sake of brevity, they will not be repeated herein.

[0274] Moreover, although six embodiments are described above, the present application is not limited to these six embodiments, and more embodiments may be combined according to the protection content of the present application.

[0275] The balancing valve embodiment provided in the present application will only open when the air pressure inside the battery pack is too high or too low, allowing the battery pack to be ventilated, and both the air inlet and outlet channels need to pass through a waterproof breathable membrane. In other cases, the valve is closed and airtight, which greatly reduces the frequency and amount of gas exchange between the battery pack and the outside world, reduces the amount of condensed water inside the battery pack, and improves the reliability of the battery pack.

[0276] The balancing valve 10 provided in this embodiment is a two-way controllable exhaust valve, which can realize the function of automatic exhaust or intake by relying on the pressure difference to maintain the balance of the internal and external pressure difference; the first elastic member 4 and the second elastic member 5 can provide the second sealing member 3 with a reset driving force and a pre-tightening force, thereby enhancing the sealing effect and preventing the balancing valve 10 from accidentally opening; by adjusting the specifications of the first elastic member 4 and the second elastic member 5, the opening pressure of the intake and exhaust can be adjusted; moreover, the first elastic member 4 and the second elastic member 5 have an overlapping portion in the first direction, so the length of the balancing valve 10 in the first direction can be significantly reduced, thereby reducing the volume of the balancing valve 10 and reducing the space occupied by the balancing valve 10; by setting a waterproof and breathable membrane 7, the balancing valve 10 can also prevent water vapor from entering, and has a moisture-proof effect.

[0277] In addition to battery packs, the balancing valve 10 can also be applied to other components that require ventilation and maintain internal and external pressure balance.

[0278] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A balancing valve (10), comprising: A valve body (1) having a first through passage (11), wherein the first passage (11) is divided into a first part and a second part; A first sealing member (2) is located in the first passage (11) and is movable relative to the valve body (1) to block or open the first portion; and The second sealing member (3) is located in the first passage (11) and is movable relative to the valve body (1) to block or open the second portion.

2. The balancing valve (10) according to claim 1, characterized in that: The first sealing member (2) comprises a first connecting portion (2a) and a first movable portion (2b), wherein the first connecting portion (2a) is connected to the valve body (1), and the first movable portion (2b) is configured to move to a blocking position under the action of a pressure difference to block the first portion, or to leave the blocking position under the action of a pressure difference to open the first portion.

3. The balancing valve (10) according to claim 2, characterized in that: The first movable part (2b) is rotatably connected to the first connecting part (2a); or, The first movable part (2b) and the first connecting part (2a) are integrally formed, and the first movable part (2b) is made of a flexible material or an elastic material.

4. The balancing valve (10) according to claim 1, characterized in that: The second sealing member (3) comprises a second connecting portion (3a) and a second movable portion (3b), wherein the second connecting portion (3a) is connected to the valve body (1), and the second movable portion (3b) is configured to move to a blocking position under the action of a pressure difference to block the second part, or to move away from the blocking position under the action of a pressure difference to open the second part.

5. The balancing valve (10) according to claim 4, characterized in that: The second movable part (3b) is rotatably connected to the second connecting part (3a); or, The second movable part (3b) and the second connecting part (3a) are integrally formed, and the second movable part (3b) is made of flexible material or elastic material.

6. The balancing valve (10) according to claim 1, characterized in that: Also includes: a first elastic member (4), connected to the first sealing member (2), and used for providing the first sealing member (2) with an elastic force to move along a first direction toward a position for blocking the first portion; the first direction is an extending direction of the first channel (11) at the first elastic member (4); and A second elastic member (5) is connected to the second sealing member (3) and is used to provide the second sealing member (3) with an elastic force to move in a direction opposite to the first direction toward a position for sealing the second portion.

7. The balancing valve (10) according to claim 6, characterized in that: The first elastic member (4) and the second elastic member (5) at least partially overlap in the first direction.

8. The balancing valve (10) according to claim 6 or 7, characterized in that: One end of the first elastic member (4) is connected to the first sealing member (2), and the other end of the first elastic member (4) is located on one side of the first sealing member (2) in the first direction; one end of the second elastic member (5) is connected to the second sealing member (3), and the other end of the second elastic member (5) is located on the same side of the second sealing member (3) in the first direction; or One end of the first elastic member (4) is connected to the first sealing member (2), and the other end of the first elastic member (4) is located on one side of the first sealing member (2) in the first direction; one end of the second elastic member (5) is connected to the second sealing member (3), and the other end of the second elastic member (5) is located on the other side of the second sealing member (3) in the first direction.

9. The balancing valve (10) according to claim 6 or 7, characterized in that: There is no space between the first portion and the second portion.

10. The balancing valve (10) according to claim 9, characterized in that: The first portion surrounds the second portion; A first through hole is formed in the middle of the first sealing member (2), the second sealing member (3) passes through the first through hole, the first portion is formed between the first sealing member (2) and the valve body (1), and the second portion is formed between the second sealing member (3) and the first sealing member (2); The first sealing member (2) is sealingly connected to the valve body (1) to seal the first portion; The second sealing member (3) is sealingly connected to the first sealing member (2) to seal the second portion.

11. The balancing valve (10) according to claim 9, characterized in that: The first portion and the second portion are distributed in a direction perpendicular to the first direction; The first portion is formed between the valve body (1) and the first sealing member (2), and the second portion is formed between the valve body (1) and the second sealing member (3); The first sealing member (2) is sealingly connected to the valve body (1) and the second sealing member (3) to seal the first portion; the second sealing member (3) is sealingly connected to the valve body (1) and the first sealing member (2) to seal the second portion.

12. The balancing valve (10) according to claim 6 or 7, characterized in that: Also includes: A separator is connected to the valve body (1); the separator is located in the first channel (11) and separates the first channel (11) into a first part and a second part.

13. The balancing valve (10) according to claim 12, characterized in that: The separator is annular, the first part is formed between the separator and the valve body (1), the second part is formed inside the separator, and the first part surrounds the second part; the first sealing member (2) is annular; The first sealing member (2) is sealingly connected to the valve body (1) and the partition member to seal the first portion; the second sealing member (3) is sealingly connected to the partition member to seal the second portion.

14. The balancing valve (10) according to claim 12, characterized in that: The partition is in the shape of a plate, the first portion is formed between one side of the partition and the valve body (1), the second portion is formed between the other side of the partition and the valve body (1), and the first portion and the second portion are distributed in a direction perpendicular to the first direction; The first sealing member (2) is sealingly connected to the valve body (1) and the partition member to seal the first portion; the second sealing member (3) is sealingly connected to the valve body (1) and the partition member to seal the second portion.

15. The balancing valve (10) according to claim 10 or 13, characterized in that: The first elastic member (4) is sleeved on the outside of the second elastic member (5).

16. The balancing valve (10) according to claim 11 or 14, characterized in that: The first elastic member (4) is located on one side of a direction perpendicular to the first direction, and the second elastic member (5) is located on the other side of the direction perpendicular to the first direction.

17. The balancing valve (10) according to claim 10, characterized in that: The second sealing member (3) comprises a sealing body (32) and a third sealing portion (33) and a first limiting member (34) respectively arranged at two ends of the sealing body (32); the sealing body (32) passes through the first through hole; the third sealing portion (33) is used to seal the first through hole; the third sealing portion (33) and the first limiting member (34) are respectively located on two sides of the first sealing member (2); the second elastic member (5) is sleeved on the outside of the sealing body (32); and the two ends of the second elastic member (5) are respectively connected to the first sealing member (2) and the first limiting member (34).

18. The balancing valve (10) according to claim 17, characterized in that: The first limiting member (34) is provided with a first limiting portion, and the first limiting portion is configured to limit the second elastic member (5) in a direction perpendicular to the first direction.

19. The balancing valve (10) according to claim 17, characterized in that: The sealing body (32) is provided with a plurality of long grooves (31) arranged at intervals along the circumferential direction, and the long grooves (31) extend along the first direction to form the second portion.

20. The balancing valve (10) according to claim 6, characterized in that: The first sealing member (2) comprises a first sealing portion (21) and a second sealing portion (22), the hardness of the first sealing portion (21) being greater than the hardness of the second sealing portion (22), the first elastic member (4) being connected to the first sealing portion (21), and the second sealing portion (22) being arranged on a side of the first sealing portion (21) away from the first elastic member (4).

21. The balancing valve (10) according to claim 1, characterized in that: The wall surface of the first channel (11) is provided with at least two first protrusions (13) arranged at intervals in the circumferential direction, a gap (14) is provided between the first sealing member (2) and the first protrusions (13), and the gap (14) between two adjacent first protrusions (13) is communicated with the first channel (11).

22. The balancing valve (10) according to claim 6, characterized in that: The valve body (1) comprises a valve body and a second limiting member (6), the first channel (11) is arranged on the valve body, the second limiting member (6) is connected to the valve body, and the second limiting member (6) is configured to limit the first elastic member (4) in the first direction.

23. The balancing valve (10) according to claim 22, characterized in that: A blocking member (15) is provided on the wall surface of the first channel (11); the blocking member (15) is arranged on a side of the second sealing member (3) away from the second limiting member (6) so as to limit the range of movement of the second sealing member (3) in a direction away from the second limiting member (6); the blocking member (15) is provided with a second through hole (16) communicating with the first channel (11).

24. The balancing valve (10) according to claim 22, characterized in that: It also comprises a waterproof and breathable membrane (7), wherein the waterproof and breathable membrane (7) is arranged at an end close to the first channel (11) and away from the second limiting member (6).

25. The balancing valve (10) according to claim 22, characterized in that: It also comprises a valve cover (8), wherein the valve cover (8) is arranged at one end of the first channel (11) away from the second stopper (6), and the valve cover (8) is configured to connect the first channel (11) with external gas.

26. A battery pack (100a), comprising a box (20) and a balancing valve (10) according to any one of claims 1 to 25, wherein the balancing valve (10) is mounted on the box (20).

27. An electrical device, comprising the battery pack (100a) according to claim 26, wherein the battery pack (100a) is used to supply electrical energy to the electrical device.

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