Balancing valves, batteries and electrical equipment

Abstract

The present application discloses a balancing valve, a battery and an electrical device, belonging to the field of battery technology. The balancing valve is used for a box body, and the balancing valve includes a valve body and a breathable membrane, and the breathable membrane divides the interior of the valve body into a first chamber and a second chamber. Among them, the wall portion of the valve body forming the first chamber is provided with a breathable port, and the wall portion of the valve body forming the second chamber is provided with an air inlet and an exhaust port. The balancing valve also includes a first closure member and a second closure member, the first closure member is provided on the inner surface of the valve body, and the second closure member is provided on the outer surface of the valve body. When the inner air pressure of the battery is greater than the outer air pressure, the first closure member is configured to open the exhaust port; when the inner air pressure of the battery is less than the outer air pressure, the second closure member is configured to open the air inlet; when the inner air pressure of the battery is equal to the outer air pressure, the first closure member closes the exhaust port, and the second closure member closes the air inlet. The arrangement of the first closure member and the second closure member can make the battery have higher reliability in a changing environment.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a balancing valve, a battery 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] Due to the complex application environment of batteries, battery cells often need to be installed in a sealed box to reduce the impact of the external environment on the battery. However, how to achieve internal and external air pressure balance in a changing environment while reducing moisture from entering the box and affecting battery reliability is an urgent problem to be solved in battery technology. Utility Model Content

[0004] In view of the above problems, the present application provides a balancing valve, a battery and an electrical device, which can improve the reliability of the battery in a changing environment.

[0005] In the first aspect, the present application provides a balancing valve, which is used for a box body. The balancing valve includes a valve body and a breathable membrane, and the breathable membrane divides the interior of the valve body into a first chamber and a second chamber. Among them, the wall portion of the valve body forming the first chamber is provided with a breathable port, and the wall portion of the valve body forming the second chamber is provided with an air inlet and an exhaust port. The balancing valve also includes a first closure member and a second closure member, the first closure member is provided on the inner surface of the valve body, and the second closure member is provided on the outer surface of the valve body. When the inner air pressure of the battery is greater than the outer air pressure, the first closure member is configured to open the exhaust port; when the outer air pressure of the battery is greater than the inner air pressure, the second closure member is configured to open the air inlet; when the inner air pressure of the battery is equal to the outer air pressure, the first closure member closes the exhaust port, and the second closure member closes the air inlet.

[0006] In the technical solution of the embodiment of the present application, the switching of the three states of intake, exhaust and balance of the balancing valve can be realized by cooperating with the first closure member and the second closure member in conjunction with the exhaust port and the inlet port, so that the balancing valve can have the function of intake or exhaust in different environments. The provision of the breathable membrane can reduce the risk of moisture entering the battery box, thereby making the battery have higher reliability in a changing environment.

[0007] In one or more embodiments of the first aspect, the first closure member and the second closure member are configured such that an opening pressure of the first closure member is greater than an opening pressure of the second closure member.

[0008] In the above scheme, the opening pressure of the first closure member is greater than the opening pressure of the second closure member, which means that the air intake valve opening pressure of the battery box is greater than the exhaust valve opening pressure of the battery, which is beneficial to reduce the risk of water vapor outside the battery entering the battery.

[0009] In one or more embodiments of the first aspect, the first closure member and the second closure member are both made of elastomeric material.

[0010] In the above solution, the first closing member and the second closing member are made of an elastomeric material, so that the balancing valve can be switched multiple times between the three states and can be reused, which is beneficial to reducing the cost of the battery.

[0011] In one or more embodiments of the first aspect, the elastomeric material is silicone, plastic or rubber.

[0012] In the above solution, the first sealing member and the second sealing member are made of silicone, plastic or rubber, which can reduce the manufacturing cost of the first sealing member and the second sealing member.

[0013] In one or more embodiments of the first aspect, a hardness of the first closure member is less than a hardness of the second closure member.

[0014] In the above scheme, since the hardness of the first sealing member is less than that of the second sealing member, the first sealing member is more difficult to open than the second sealing member, which increases the difficulty of the gas outside the box entering the inside of the box, and can reduce the risk of water vapor outside the battery entering the inside of the battery.

[0015] In one or more embodiments of the first aspect, a thickness of the first closure member is less than a thickness of the second closure member.

[0016] In the above scheme, since the thickness of the first sealing member is smaller than that of the second sealing member, the second sealing member is more difficult to deform than the first sealing member, resulting in the battery's air intake valve opening pressure being greater than the battery's exhaust valve opening pressure, which is beneficial to reduce the risk of water vapor outside the battery entering the battery.

[0017] In one or more embodiments of the first aspect, an area of ​​the exhaust port is greater than an area of ​​the intake port.

[0018] In the above scheme, since the area of ​​the exhaust port is larger than that of the air inlet, the gas is relatively easier to be discharged from the battery box through the exhaust port. Conversely, it is relatively more difficult for the gas to enter the battery box, which is beneficial to reduce the risk of water vapor outside the battery entering the battery.

[0019] In one or more embodiments of the first aspect, the valve body includes an outer wall and an inner wall, both of which are annular, and the outer wall is arranged around the inner wall and is spaced from each other. The air inlet is arranged on the outer wall, the air outlet is arranged on the inner wall, the first closing piece is sleeved on the inner wall, and the second closing piece is sleeved on the outer wall.

[0020] In the above scheme, the first closure member is installed on the inner wall and the second closure member is installed on the outer wall by sleeve installation. The first closure member and the second closure member can be assembled without fasteners, which has low cost and high assembly efficiency.

[0021] In one or more embodiments of the first aspect, a plurality of air inlets are provided, and the plurality of air inlets are distributed at intervals along the circumference of the outer side wall.

[0022] In the above solution, when the battery is intake air, since the multiple air inlets are distributed circumferentially along the outer wall, the risk of excessive local force on the second sealing member during operation can be reduced, thereby increasing the service life of the second sealing member.

[0023] In one or more embodiments of the first aspect, a plurality of exhaust ports are provided, and the plurality of exhaust ports are distributed at intervals along the circumference of the inner side wall.

[0024] In the above solution, when the battery is exhausted, since the multiple air inlets are distributed circumferentially along the outer wall, the risk of excessive local force on the first sealing member during operation can be reduced, thereby increasing the service life of the first sealing member.

[0025] In one or more embodiments of the first aspect, the valve body also includes a first bottom wall and a second bottom wall, the inner wall is arranged around the first bottom wall, the outer wall is arranged around the second bottom wall, one end of the inner wall in the axial direction is connected to the first bottom wall, the other end of the inner wall in the axial direction is connected to the second bottom wall, and the second bottom wall connects the outer wall and the inner wall.

[0026] In the above solution, the first bottom wall can be used as an assembly reference for the inner wall, and the second bottom wall can be used as an assembly reference for the outer wall, which reduces the difficulty of designing and assembling the balancing valve, thereby helping to save the production cost of the battery.

[0027] In one or more embodiments of the first aspect, one end of the first closing piece abuts against the second bottom wall, and the other end of the first closing piece does not extend beyond the first bottom wall.

[0028] In the above solution, when the battery is exhausted, one end of the first closure member is limited by the second bottom wall, which is conducive to driving the airflow to flow basically in one direction, thereby improving the exhaust efficiency of the battery. At the same time, since the other end of the first closure member does not exceed the first bottom wall, the risk of the first closure member being unable to open the exhaust port in time when affected by the airflow can also be reduced.

[0029] In one or more embodiments of the first aspect, a first step surface is formed on the outer peripheral surface of the outer wall, one end of the second closing piece abuts against the first step surface, and the other end of the second closing piece does not extend beyond the second bottom wall.

[0030] In the above solution, when the battery is inhaling air, one end of the second sealing member is limited by the first step surface, which is conducive to driving the airflow to flow basically in one direction, thereby facilitating improving the air intake efficiency of the battery. At the same time, since the other end of the second sealing member does not extend beyond the second bottom wall, the risk of the second sealing member being unable to open the air inlet in time when affected by the airflow can also be reduced.

[0031] In one or more embodiments of the first aspect, a second step surface is formed on the inner circumferential surface of the outer side wall, and the edge of the breathable membrane is connected to the second step surface.

[0032] In the above solution, the second step surface can position the breathable membrane, which is helpful to reduce the difficulty of assembling the breathable membrane, thereby reducing the assembly cost of the balancing valve.

[0033] In one or more embodiments of the first aspect, the valve body further comprises a cover body, an end of the outer wall away from the second bottom wall forms an opening, the cover body closes the opening, and the air vent is arranged on the cover body.

[0034] In the above solution, the provision of the cover body is conducive to reducing the risk of foreign matter entering the interior of the valve body and causing damage to the first closure member and / or the breathable membrane, which is conducive to increasing the service life of the balancing valve.

[0035] In a second aspect, the present application provides a battery, which includes a box and a balancing valve in one or more embodiments of the first aspect, wherein the balancing valve is installed on the wall of the box, and the balancing valve is used to balance the air pressure inside and outside the box.

[0036] In the above scheme, since the balancing valve in one or more embodiments of the first aspect has high reliability, the battery including the balancing valve in one or more embodiments of the first aspect also has high reliability.

[0037] In a third aspect, the present application provides an electrical device, the electrical device comprising the battery in one or more embodiments of the second aspect, the battery being used to provide electrical energy.

[0038] In the above scheme, since the battery in one or more embodiments of the second aspect has high reliability, the electrical equipment including the battery in one or more embodiments of the second aspect also has high reliability.

[0039] 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, which can be implemented in accordance with the contents of the specification, and to make 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

[0040] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0041] Figure 1 A schematic diagram of the structure of a vehicle according to some embodiments of the present application;

[0042] Figure 2 An exploded view of a battery according to some embodiments of the present application;

[0043] Figure 3 An isometric view of a battery according to some embodiments of the present application;

[0044] Figure 4 An exploded view of a balancing valve according to some embodiments of the present application;

[0045] Figure 5 An axonometric diagram of a balancing valve according to some embodiments of the present application;

[0046] Figure 6 An axonometric view of a partial structure of a valve body in some embodiments of the present application;

[0047] Figure 7 It is a cross-sectional view of a balancing valve of some embodiments of the present application, showing the state of the first closure member and the second closure member when the internal air pressure of the battery is equal to the external air pressure;

[0048] Figure 8 It is a cross-sectional view of a balancing valve of some embodiments of the present application, showing the state of the first closure member and the second closure member when the air pressure inside the battery is less than the air pressure outside the battery;

[0049] Fig. 9 It is a cross-sectional view of a balancing valve of some embodiments of the present application, showing the state of the first closure member and the second closure member when the internal air pressure of the battery is greater than the external air pressure;

[0050] Fig.10 A cross-sectional view of a partial structure of a battery according to some embodiments of the present application.

[0051] The reference numerals in the specific implementation manner are as follows:

[0052] 1000-vehicle; 200-controller; 300-motor; 100-battery; 11-housing; 111-first part; 112-second part; 13-balancing valve; 131-valve body; 1311-outer wall; 13111-first step surface; 13112-second step surface; 13113-opening; 1312-inner wall; 1313-first bottom wall; 1314-second bottom wall; 1315-cover; 132-air vent; 133-air inlet; 134-exhaust port; 135-first closure member; 136-second closure member; 137-breathable membrane; 138-first chamber; 139-second chamber. DETAILED DESCRIPTION

[0053] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0054] 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.

[0055] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0056] 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.

[0057] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0058] 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.

[0059] In the present application, battery cells may include but are not limited to lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries or magnesium-ion batteries, etc. The shape of the battery cell may include but is not limited to a cylinder, a flat body, a rectangular parallelepiped or other shapes, etc. The battery cell may include but is not limited to a cylindrical battery cell, a square battery cell, a soft-pack battery cell and a blade battery cell according to the packaging method.

[0060] In some high-power applications such as electric vehicles, the application of batteries includes three levels: battery cells, battery modules and batteries. The battery module is formed by electrically connecting a certain number of battery cells together and placing them in a frame in order to protect the battery cells from external impact, heat, vibration, etc. The battery refers to the final state of the battery system installed in the electric vehicle. The battery mentioned in the embodiments of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. The battery generally includes a casing for encapsulating one or more battery cells. The casing can reduce the risk of liquid or other foreign matter affecting the charging or discharging of the battery cells.

[0061] The development of battery technology must take into account many design factors at the same time, such as performance parameters such as cycle life, discharge capacity, energy density, charge and discharge rate, and battery reliability.

[0062] In a changing application environment, the battery box needs to maintain a balanced air pressure inside and outside. If the pressure difference between the inside and outside of the battery box is too large, the box will deform and the seal will fail, and the risk of moisture outside the battery entering the box will increase. Once moisture enters the battery box, it may cause the battery cell to short-circuit or even catch fire, and the battery reliability is poor.

[0063] In view of this, the present application provides a balancing valve, which is used for batteries. The balancing valve includes a valve body and a breathable membrane, and the breathable membrane divides the interior of the valve body into a first chamber and a second chamber. Among them, the wall portion of the valve body forming the first chamber is provided with a breathable port, and the wall portion of the valve body forming the second chamber is provided with an air inlet and an exhaust port. The balancing valve also includes a first closure member and a second closure member, the first closure member is provided on the inner surface of the valve body, and the second closure member is provided on the outer surface of the valve body. When the inner air pressure of the battery is greater than the outer air pressure, the first closure member is configured to open the exhaust port; when the inner air pressure of the battery is less than the outer air pressure, the second closure member is configured to open the air inlet; when the inner air pressure of the battery is equal to the outer air pressure, the first closure member closes the exhaust port, and the second closure member closes the air inlet. By cooperating with the first closure member and the second closure member, the exhaust port and the inlet port, the switching of the balancing valve among the three states of intake, exhaust and balance can be realized, so that the balancing valve can have the function of intake or exhaust in different environments. The setting of the breathable membrane can reduce the risk of moisture entering the battery box, thereby making the battery have higher reliability in a changing environment.

[0064] The technical solutions described in the embodiments of the present application are applicable to batteries and electrical equipment using batteries.

[0065] Electrical equipment includes, but is not limited to: battery vehicles, electric vehicles, ships, and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.

[0066] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.

[0067] For example, Figure 1 The schematic diagram of the structure of the vehicle 1000 of some embodiments of the present application, the vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. The motor 300, the controller 200 and the battery 100 can be arranged inside the vehicle 1000, and the controller 200 is used to control the battery 100 to power the motor 300. For example, the battery 100 can be arranged at the bottom or the front or the rear of the vehicle 1000. The battery 100 can be used for powering the vehicle 1000, for example, the battery 100 can be used as the operating power supply of the vehicle 1000, for the circuit system of the vehicle 1000, for example, for the working power demand of the vehicle 1000 during startup, navigation and operation. In another embodiment of the present application, the battery 100 can not only be used as the operating power supply of the vehicle 1000, but also as the driving power supply of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0068] In order to meet different power requirements, the battery 100 may include a plurality of battery cells, wherein the plurality of battery cells may be connected in series, in parallel, or in a hybrid connection, wherein the hybrid connection refers to a mixture of series and parallel connections. The battery 100 may also be referred to as a battery pack. Optionally, a plurality of battery cells may first be connected in series, in parallel, or in a hybrid connection to form a battery module, and a plurality of battery modules may then be connected in series, in parallel, or in a hybrid connection to form the battery 100. In other words, a plurality of battery cells may directly form the battery 100, or they may first form a battery module, and then the battery module may form the battery 100.

[0069] For example, see Figure 2 , Figure 2 1 is an exploded view of a battery 100 in some embodiments of the present application. The battery 100 may include a plurality of battery cells. The battery 100 may also include a housing 11. The interior of the housing 11 is a hollow structure. The plurality of battery cells are accommodated in the housing 11. Figure 2 As shown, they are respectively referred to as the first part 111 and the second part 112, and the first part 111 and the second part 112 are buckled together. The shapes of the first part 111 and the second part 112 can be determined according to the shapes of the combination of multiple battery cells, and the first part 111 and the second part 112 can both have an opening 13113. For example, the first part 111 and the second part 112 can both be hollow cuboids and each has only one face as the opening 13113 face, the opening 13113 of the first part 111 and the opening 13113 of the second part 112 are arranged opposite to each other, and the first part 111 and the second part 112 are buckled together to form a box body 11 with a closed chamber. Multiple battery cells are connected in parallel, in series, or in a mixed combination and are placed in the box body 11 formed by the buckling of the first part 111 and the second part 112.

[0070] Optionally, the battery 100 may also include other structures, which are not described here one by one. For example, the battery 100 may also include a busbar component, which is used to realize electrical connection between multiple battery cells, such as parallel connection, series connection, or mixed connection. Specifically, the busbar component can realize electrical connection between battery cells by connecting the electrode terminals of the battery cells. Further, the busbar component can be fixed to the electrode terminals of the battery cells by welding. The electrical energy of multiple battery cells can be further led out through the box body 11 through the conductive mechanism. For example, please refer to Figure 3 The battery 100 may further include a balancing valve 13 , which may be disposed on any wall of the box body 11 to balance the air pressure inside and outside the box body 11 .

[0071] According to different power requirements, the number of battery cells can be set to any value. Multiple battery cells can be connected in series, parallel or hybrid to achieve a larger capacity or power. Since the number of battery cells included in each battery 100 may be large, for ease of installation, the battery cells can be grouped and each group of battery cells constitutes a battery module. The number of battery cells included in the battery module is not limited and can be set according to demand. The battery 100 may include multiple battery modules, which can be connected in series, parallel or hybrid.

[0072] According to some embodiments of this application, please refer to Figure 3 and Figure 7-Figure 9 The present application provides a balancing valve 13, which is used in a box 11. The balancing valve 13 includes a valve body 131 and a breathable membrane 137. The breathable membrane 137 divides the interior of the valve body 131 into a first chamber 138 and a second chamber 139. The wall of the valve body 131 forming the first chamber 138 is provided with a breathable port 132, and the wall of the valve body 131 forming the second chamber 139 is provided with an air inlet 133 and an air outlet 134. The balancing valve 13 also includes a first closing member 135 and a second closing member 136. The first closing member 135 is provided on the inner surface of the valve body 131, and the second closing member 136 is provided on the outer surface of the valve body 131. When the air pressure inside the battery 100 is greater than the air pressure outside the battery 100, the first closing piece 135 is configured to open the exhaust port 134; when the air pressure inside the battery 100 is less than the air pressure outside the battery 100, the second closing piece 136 is configured to open the air inlet 133; when the air pressure inside the battery 100 is equal to the air pressure outside the battery 100, the first closing piece 135 closes the exhaust port 134, and the second closing piece 136 closes the air inlet 133.

[0073] A chamber is formed inside the valve body 131 , the inner surface of the valve body 131 refers to the inner surface of the chamber, and the outer surface of the valve body 131 refers to the outer surface of the chamber.

[0074] Opening in the present application means that the second chamber 139 is in communication with the interior of the battery 100 .

[0075] The vent 132 in the present application is always in communication with the outside of the battery 100 , and the first chamber 138 and the second chamber 139 are always in communication.

[0076] The vent 132 may refer to a through hole provided on the wall of the first chamber 138, or may refer to a channel provided on the wall of the first chamber 138. The shape of the through hole may include but is not limited to a polygon, a circle, an ellipse, a teardrop shape, etc., and the shape of the channel may include but is not limited to a straight line, an arc, a broken line, etc. In some embodiments, a plurality of vents 132 may be provided, and the plurality of vents 132 may be distributed in a plum blossom shape.

[0077] The exhaust port 134 and the air inlet 133 may refer to a through hole provided on the wall of the second chamber 139, or may refer to a channel provided on the wall of the second chamber 139. The shape of the through hole may include but is not limited to a polygon, a circle, an ellipse, a teardrop shape, etc., and the shape of the channel may include but is not limited to a straight line, an arc, a broken line, etc. In some embodiments, the valve body 131 is a rotating body, and a plurality of air inlets 133 and exhaust ports 134 are provided, and the plurality of air inlets 133 and the plurality of exhaust ports 134 correspond to each other one by one. In the radial direction of the valve body 131, the air inlet 133 and the exhaust port 134 do not overlap. In other embodiments, the air inlet 133 and the exhaust port 134 at least partially overlap.

[0078] In some embodiments, the first closure member 135 and the second closure member 136 may be annular soft glue. In other embodiments, the first closure member 135 and the second closure member 136 may be sheet-shaped soft glue, at least part of the edge of the sheet-shaped soft glue is attached to the valve body 131, and when the exhaust port 134 is opened, a gap for gas flow is formed between at least part of the first closure member 135 and the inner surface of the valve body 131, and the gas inside the battery 100 can flow to the outside of the battery 100 through this gap. When the air inlet 133 is opened, a gap for gas flow is formed between at least part of the second closure member 136 and the outer surface of the valve body 131, and the gas outside the battery 100 can flow to the inside of the battery 100 through this gap.

[0079] When the air pressure inside the battery 100 is greater than the air pressure outside, the force formed by the pressure difference will drive the first closing member 135 to separate from the inner surface of the valve body 131, and at the same time drive the second closing member 136 to be close to the valve body 131; when the air pressure inside the battery 100 is less than the air pressure outside, the force formed by the pressure difference will drive the first closing member 135 to be close to the inner surface of the valve body 131, and at the same time drive the second closing member 136 to separate from the outer surface of the valve body 131; when the air pressure inside the battery 100 is equal to the air pressure outside, the pressure difference is zero, and neither the first closing member 135 nor the second closing member 136 is affected by any force.

[0080] In some embodiments, when the air pressure inside the box 11 is greater than the air pressure outside and greater than a first preset value, the exhaust port 134 is opened. When the air pressure outside the box 11 is greater than the air pressure inside and greater than a second preset value, the air inlet 133 is opened. When the air pressure inside the box 11 is greater than the air pressure outside but less than the first preset value, or when the air pressure outside the box 11 is greater than the air pressure inside but less than the second preset value, the first sealing member 135 seals the exhaust port 134, and the second sealing member 136 seals the air inlet 133.

[0081] In the technical solution of the embodiment of the present application, the first closure member 135 and the second closure member 136 cooperate with the exhaust port 134 and the intake port 133 to realize the switching of the three states of intake, exhaust and balance of the balancing valve 13, so that the balancing valve 13 can have the function of intake or exhaust in different environments, and the setting of the breathable membrane 137 can reduce the risk of moisture entering the box 11 of the battery 100, so that the battery 100 has higher reliability in a changing environment. On the other hand, such a setting has a simple structure and low cost, which is conducive to reducing the production cost of the battery 100.

[0082] According to some embodiments of this application, please refer to Figure 3 and Figure 7-Figure 9 The first closure member 135 and the second closure member 136 are configured such that the opening pressure of the first closure member 135 is greater than the opening pressure of the second closure member 136 .

[0083] The first sealing member 135 and the second sealing member 136 are configured such that the opening pressure of the first sealing member 135 is greater than the opening pressure of the second sealing member 136, which means that the air inlet valve opening pressure of the case 11 of the battery 100 is greater than the exhaust valve opening pressure of the battery. In other words, it is relatively more difficult for gas to enter the interior of the case 11 of the battery 100.

[0084] In some embodiments, the thickness of the first sealing member 135 is smaller than that of the second sealing member 136 , the area of ​​the exhaust port 134 is larger than that of the air inlet 133 , and the hardness of the first sealing member 135 is smaller than that of the second sealing member 136 .

[0085] In some embodiments, the thickness of the first sealing member 135 is smaller than the thickness of the second sealing member 136 , and the area of ​​the exhaust port 134 is larger than the area of ​​the intake port 133 .

[0086] In some embodiments, the thickness of the first sealing member 135 is smaller than the thickness of the second sealing member 136 , and the hardness of the first sealing member 135 is smaller than the hardness of the second sealing member 136 .

[0087] In some embodiments, the area of ​​the exhaust port 134 is greater than the area of ​​the inlet port 133 , and the hardness of the first sealing member 135 is less than the hardness of the second sealing member 136 .

[0088] In the above solution, the intake valve opening pressure of the balance valve 13 is greater than the exhaust valve opening pressure, which is beneficial to reduce the risk of water vapor outside the battery entering the inside of the battery.

[0089] According to some embodiments of this application, please refer to Figure 3 and Figure 7-Figure 9 , the first closing piece 135 and the second closing piece 136 are both made of elastomeric materials.

[0090] The first sealing member 135 and the second sealing member 136 are made of elastic material, which means that the first sealing member 135 and the second sealing member 136 have a certain recovery ability after being deformed. In other words, the balancing valve 13 can be switched multiple times among the three states of intake, exhaust and balance. For example, when the air pressure inside the battery 100 is greater than the air pressure outside the battery 100, the first sealing member 135 is deformed to open the exhaust port 134. If the air pressure inside the battery 100 becomes equal to the air pressure outside the battery 100 after a certain period of time, the first sealing member 135 returns to the initial state and re-closes the exhaust port 134. If the air pressure inside the battery 100 is greater than the air pressure outside the battery 100 again after a certain period of time, the first sealing member 135 will deform again to open the exhaust port 134.

[0091] In the above solution, the first closing member 135 and the second closing member 136 are made of an elastomeric material, so that the balancing valve 13 can be switched among the three states for multiple times and then reused, which is beneficial to further reduce the cost of the battery 100 .

[0092] According to some embodiments of the present application, the elastomeric material is silicone, plastic or rubber.

[0093] Silicone, plastic or rubber all have lower costs and more mature processing technology.

[0094] In the above solution, the first sealing member 135 and the second sealing member 136 are made of silicone, plastic or rubber, which can reduce the manufacturing cost of the first sealing member 135 and the second sealing member 136.

[0095] According to some embodiments of this application, please refer to Figure 3 and Figure 7-Figure 9 , the hardness of the first sealing member 135 is less than the hardness of the second sealing member 136 .

[0096] The hardness of the first sealing member 135 is less than that of the second sealing member 136, which means that when the same internal and external pressure difference acts on the first sealing member 135 and the second sealing member 136, the second sealing member 136 is more difficult to deform, that is, the air inlet 133 is more difficult to open than the air outlet, that is, the air intake valve opening pressure of the battery 100 is greater than the exhaust valve opening pressure of the battery 100.

[0097] In the above scheme, since the hardness of the first sealing member 135 is less than that of the second sealing member 136, the first sealing member 135 is more difficult to open than the second sealing member 136, which increases the difficulty of the gas outside the box body 11 entering the inside of the box body 11, and reduces the risk of water vapor outside the battery 100 entering the inside of the battery 100.

[0098] According to some embodiments of this application, please refer to Figure 3 and Figure 7-Figure 9, the thickness of the first sealing member 135 is smaller than the thickness of the second sealing member 136 .

[0099] The thickness of the first closure member 135 is smaller than that of the second closure member 136 , which means that when the same internal and external pressure difference acts on the first closure member 135 and the second closure member 136 , the second closure member 136 is more difficult to deform, that is, the air inlet 133 is more difficult to open than the air outlet, that is, the air intake valve opening pressure of the battery 100 is greater than the exhaust valve opening pressure of the battery 100 .

[0100] In the above scheme, since the thickness of the first sealing member 135 is smaller than the thickness of the second sealing member 136, the second sealing member 136 is more difficult to deform than the first sealing member 135, resulting in the air intake valve opening pressure of the battery 100 being greater than the exhaust valve opening pressure of the battery 100, which is beneficial to reduce the risk of water vapor outside the battery 100 entering the interior of the battery 100.

[0101] According to some embodiments of this application, please refer to Figure 3 and Figure 7-Figure 9 , the area of ​​the exhaust port 134 is larger than the area of ​​the air inlet 133 .

[0102] The area of ​​the exhaust port 134 is greater than that of the air inlet 133, which means that when the same internal and external pressure difference acts on the first closure member 135 and the second closure member 136, the second closure member 136 is more difficult to deform, that is, the air inlet 133 is more difficult to open than the exhaust port 134, that is, the air intake valve opening pressure of the battery 100 is greater than the exhaust valve opening pressure of the battery 100.

[0103] In the above scheme, since the area of ​​the exhaust port 134 is larger than the area of ​​the air inlet 133, the air intake valve opening pressure of the battery 100 is greater than the exhaust valve opening pressure of the battery 100, which helps to reduce the risk of water vapor outside the battery 100 entering the interior of the battery 100.

[0104] According to some embodiments of this application, please refer to Figure 3 and Figure 7-Figure 9 The valve body 131 includes an outer wall 1311 and an inner wall 1312. The outer wall 1311 and the inner wall 1312 are both annular. The outer wall 1311 surrounds the inner wall 1312 and is spaced apart from each other. The air inlet 133 is provided on the outer wall 1311, the air outlet 134 is provided on the inner wall 1312, the first closing member 135 is sleeved on the inner wall 1312, and the second closing member 136 is sleeved on the outer wall 1311.

[0105] Please refer to Figure 7 When in balance, the first closing piece 135 is in contact with the inner wall 1312 , and the second closing piece 136 is in contact with the outer wall 1311 .

[0106] The outer wall 1311 and the inner wall 1312 may be concentric rings or non-concentric rings.

[0107] In some embodiments, the axis of the outer sidewall 1311 coincides with the axis of the inner sidewall 1312 .

[0108] In some embodiments, the outer surface of the outer wall 1311 and / or the inner wall 1312 is a conical surface.

[0109] In some embodiments, the inner surface of the outer wall 1311 and / or the inner wall 1312 is a conical surface.

[0110] In the above scheme, the first closure member 135 is installed on the inner wall 1312 and the second closure member 136 is installed on the outer wall 1311 by sleeve installation. The first closure member 135 and the second closure member 136 can be assembled without fasteners, which has low cost and high assembly efficiency.

[0111] According to some embodiments of this application, please refer to Figure 3 and Figure 7-Figure 9 A plurality of air inlets 133 are provided, and the plurality of air inlets 133 are distributed at intervals along the circumference of the outer side wall 1311 .

[0112] In some embodiments, the plurality of air inlets 133 are distributed in a circular array along the axis of the outer side wall 1311 .

[0113] In the above solution, when the battery 100 takes in air, since the multiple air inlets 133 are distributed circumferentially along the outer wall 1311 , the risk of excessive local force on the second sealing member 136 during operation can be reduced, thereby increasing the service life of the second sealing member 136 .

[0114] According to some embodiments of this application, please refer to Figure 3 and Figure 7-Figure 9 A plurality of exhaust ports 134 are provided, and the plurality of exhaust ports 134 are distributed at intervals along the circumference of the inner side wall 1312 .

[0115] In some embodiments, the plurality of air inlets 133 are distributed in a circular array along the axis of the inner sidewall 1312 .

[0116] In the above solution, when the battery 100 is exhausted, since the multiple air inlets 133 are distributed circumferentially along the outer wall 1311 , the risk of excessive local force on the first sealing member 135 during operation can be reduced, thereby increasing the service life of the first sealing member 135 .

[0117] According to some embodiments of this application, please refer to Figure 3 and Figure 7-Figure 9The valve body 131 also includes a first bottom wall 1313 and a second bottom wall 1314, the inner wall 1312 is surrounded by the first bottom wall 1313, the outer wall 1311 is surrounded by the second bottom wall 1314, one end of the inner wall 1312 in the axial direction is connected to the first bottom wall 1313, and the other end of the inner wall 1312 in the axial direction is connected to the second bottom wall 1314, and the second bottom wall 1314 connects the outer wall 1311 and the inner wall 1312.

[0118] In some embodiments, please refer to Figure 7 The first bottom wall 1313, the second bottom wall 1314 and the inner side wall 1312 form a chamber on the outside of the valve body 131 that is connected to the inside of the battery 100. The arrangement of the chamber is conducive to gathering gas, thereby improving the valve opening efficiency.

[0119] In the above scheme, the first bottom wall 1313 can be used as an assembly reference for the inner wall 1312 , and the second bottom wall 1314 can be used as an assembly reference for the outer wall 1311 , which reduces the difficulty of designing and assembling the balancing valve 13 , thereby helping to save the production cost of the battery 100 .

[0120] According to some embodiments of this application, please refer to Figure 3 and Figure 7-Figure 9 One end of the first closing piece 135 abuts against the second bottom wall 1314 , and the other end of the first closing piece 135 does not extend beyond the first bottom wall 1313 .

[0121] Please refer to Fig. 9 When the first sealing member 135 is deformed, the first sealing member 135 abuts against the second bottom wall 1314, which means that it is conducive to the airflow to flow in the direction away from the second bottom wall 1314, that is, upward, so that the gas flows basically in one direction, which is conducive to forming a stable gap for gas flow between the first sealing member 135 and the inner wall 1312 for a certain period of time. Since the other end of the first sealing member 135 does not exceed the first bottom wall 1313, the end of the first sealing member 135 will not be attached to the surface of the first bottom wall 1313 away from the second bottom wall 1314 during the deformation of the first sealing member 135, which is also conducive to forming a stable gap for gas flow between the first sealing member 135 and the inner wall 1312.

[0122] In the above solution, when the battery 100 is exhausted, one end of the first sealing member 135 is limited by the second bottom wall 1314, which is conducive to driving the airflow to flow basically in one direction, thereby facilitating improving the exhaust efficiency of the battery 100. At the same time, since the other end of the first sealing member 135 does not extend beyond the first bottom wall 1313, the risk of the first sealing member 135 being unable to open the exhaust port 134 in time when affected by the airflow can also be reduced.

[0123] According to some embodiments of this application, please refer to Figure 3and Figure 7-Figure 9 A first step surface 13111 is formed on the outer peripheral surface of the outer wall 1311 , one end of the second closing piece 136 abuts against the first step surface 13111 , and the other end of the second closing piece 136 does not exceed the second bottom wall 1314 .

[0124] Please refer to Figure 8 When the second sealing member 136 is deformed, the second sealing member 136 abuts against the first step surface 13111, which means that it is conducive to the airflow to flow in the direction away from the first bottom wall 1313, that is, downward, and in the axial direction of the valve body 131, the gas is basically flowed in one direction, which is conducive to forming a stable gap for gas flow between the second sealing member 136 and the outer side wall 1311 for a certain period of time. Since the other end of the second sealing member 136 does not exceed the second bottom wall 1314, the end of the second sealing member 136 will not be attached to the surface of the second bottom wall 1314 away from the first bottom wall 1313 during the deformation process of the second sealing member 136, which is also conducive to forming a stable gap for gas flow between the second sealing member 136 and the outer side wall 1311.

[0125] In some embodiments, please refer to Figure 8-Figure 9 , the air inlet 133 is arranged on the side of the outer wall 1311 close to the second bottom wall 1314, and the air outlet is arranged on the side of the inner wall 1312 close to the first bottom wall 1313, that is, when exhausting, the lower part of the first closing member 135 has a smaller deformation amplitude, and the upper part has a larger deformation amplitude, and the lower part has a certain structural strength under the restriction of the second bottom wall 1314, so that the gap formed after the upper part is separated from the inner wall 1312 is relatively stable. When intake, the upper part of the second closing member 136 has a larger deformation amplitude, and the lower part has a smaller deformation amplitude, and the upper part has a certain structural strength under the restriction of the first step surface 13111, so that the gap formed after the lower part is separated from the outer wall 1311 is relatively stable. The above arrangement can make exhaust and intake smoother.

[0126] In the above solution, when the battery 100 is inhaled, one end of the second sealing member 136 is limited by the first step surface 13111, which is conducive to driving the airflow to flow basically in one direction in the axial direction of the valve body 131, thereby facilitating the improvement of the air intake efficiency of the battery 100. At the same time, since the other end of the second sealing member 136 does not extend beyond the second bottom wall 1314, the risk of the second sealing member 136 failing to open the air inlet 133 in time when affected by the airflow can also be reduced.

[0127] According to some embodiments of this application, please refer to Figure 4-Figure 7 A second step surface 13112 is formed on the inner circumferential surface of the outer wall 1311 , and the edge of the breathable membrane 137 is connected to the second step surface 13112 .

[0128] The breathable membrane 137 can be bonded or connected to the second step surface 13112 via fasteners.

[0129] In the above solution, the second step surface 13112 can position the air-permeable membrane 137 , which is helpful to reduce the difficulty of assembling the air-permeable membrane 137 , thereby reducing the assembly cost of the balancing valve 13 .

[0130] According to some embodiments of this application, please refer to Figure 4-Figure 7 The valve body 131 further includes a cover body 1315 . An end of the outer wall 1311 away from the second bottom wall 1314 forms an opening 13113 . The cover body 1315 closes the opening 13113 . The air vent 132 is disposed on the cover body 1315 .

[0131] The size of the air vent 132 is smaller than that of the opening 13113 , which helps to reduce the risk of foreign matter entering the valve body 131 and the risk of foreign matter damaging the air permeable membrane 137 and the first closure member 135 .

[0132] The cover 1315 can be welded or bonded to the outer wall 1311 .

[0133] In the above solution, the provision of the cover body 1315 is conducive to reducing the risk of foreign matter entering the interior of the valve body 131 and causing damage to the first closure member 135 and / or the breathable membrane 137, which is conducive to increasing the service life of the balancing valve 13.

[0134] According to some embodiments of this application, please refer to Figure 2 , Figure 3 and Fig.10 The present application provides a battery 100, which includes a box body 11 and a balancing valve 13 in one or more of the above embodiments. The balancing valve 13 is installed on the wall of the box body 11, and the balancing valve 13 is used to balance the air pressure inside and outside the box body 11.

[0135] In some embodiments, the box body 11 includes a lower box body and a box cover, the lower box body has an opening, the box cover closes the opening to form a closed accommodating cavity, and the accommodating cavity is used to accommodate the battery cell. The lower box body has a bottom wall opposite to the box cover and a peripheral wall surrounding the bottom wall, and the balancing valve 13 is penetrated through the peripheral wall. One end of the second vent extends to the outside of the box body 11, and one end of the first vent extends to the inside of the box body 11.

[0136] In the above scheme, since the balancing valve 13 in one or more of the above embodiments has high reliability, the battery 100 including the balancing valve 13 in one or more of the above embodiments also has high reliability.

[0137] According to some embodiments of this application, please refer to Figure 1In a third aspect, the present application provides an electrical device, which includes the battery 100 in one or more of the above embodiments, and the battery 100 is used to provide electrical energy.

[0138] In the above scheme, since the battery 100 in one or more of the above embodiments has high reliability, the electrical equipment including the battery 100 in one or more of the above embodiments also has high reliability.

[0139] According to some embodiments of the present application, referring to Figure 4-Figure 9 The present application provides a balancing valve 13, which is used for the box 11 of the battery 100. The balancing valve 13 includes a valve body 131 and a breathable membrane 137. The breathable membrane 137 divides the interior of the valve body 131 into a first chamber 138 and a second chamber 139. Among them, the wall of the valve body 131 forming the first chamber 138 is provided with a breathable port 132, and the wall of the valve body 131 forming the second chamber 139 is provided with an air inlet 133 and an exhaust port 134. The balancing valve 13 also includes a first closure member 135 and a second closure member 136. The first closure member 135 is provided on the inner surface of the valve body 131, and the second closure member 136 is provided on the outer surface of the valve body 131. The first closure member 135 and the second closure member 136 are both made of elastomeric materials, and the elastomeric materials are silicone, plastic or rubber. The hardness of the first closure member 135 is less than the hardness of the second closure member 136. The thickness of the first closure member 135 is less than the thickness of the second closure member 136.

[0140] The valve body 131 includes a cover 1315, an outer side wall 1311, an inner side wall 1312, a first bottom wall 1313, and a second bottom wall 1314. The inner side wall 1312 is arranged around the first bottom wall 1313, the outer side wall 1311 is arranged around the second bottom wall 1314, one end of the inner side wall 1312 in the axial direction is connected to the first bottom wall 1313, the other end of the inner side wall 1312 in the axial direction is connected to the second bottom wall 1314, and the second bottom wall 1314 connects the outer side wall 1311 and the inner side wall 1312. The valve body 131 also includes a cover 1315, one end of the outer side wall 1311 away from the second bottom wall 1314 forms an opening 13113, the cover 1315 closes the opening 13113, and the air vent 132 is arranged on the cover 1315. The cover body 1315 and a portion of the outer wall 1311 together define a first chamber 138 , and another portion of the outer wall 1311 , the first bottom wall 1313 , the second bottom wall 1314 and the inner wall 1312 together define a second chamber 139 .

[0141] The outer wall 1311 and the inner wall 1312 are both annular, and the outer wall 1311 is arranged around the inner wall 1312 and spaced from each other. The air inlet 133 is arranged on the outer wall 1311, the air outlet 134 is arranged on the inner wall 1312, the first closing member 135 is sleeved on the inner wall 1312, and the second closing member 136 is sleeved on the outer wall 1311. One end of the first closing member 135 abuts against the second bottom wall 1314, and the other end of the first closing member 135 does not exceed the first bottom wall 1313. The outer peripheral surface of the outer wall 1311 is formed with a first step surface 13111, and one end of the second closing member 136 abuts against the first step surface 13111, and the other end of the second closing member 136 does not exceed the second bottom wall 1314. The inner peripheral surface of the outer wall 1311 is formed with a second step surface 13112, and the edge of the breathable membrane 137 is connected to the second step surface 13112. A plurality of air inlets 133 are provided, and the plurality of air inlets 133 are distributed at intervals along the circumference of the outer side wall 1311. A plurality of air outlets 134 are provided, and the plurality of air outlets 134 are distributed at intervals along the circumference of the inner side wall 1312.

[0142] Combined with the following Figure 7-Figure 9 For an explanation of the gas flow direction in the three states of the balancing valve 13, please refer to Fig. 9 When the air pressure inside the battery 100 is greater than the air pressure outside, the gas first gathers in the chamber outside the valve body 131 defined by the inner wall 1312 and the first bottom wall 1313, and squeezes the first closing member 135, so that the upper part of the first closing member 135 is separated from the inner wall 1312, and the exhaust port 134 is connected with the second chamber 139. The gas flows along the hollow arrow and flows out of the valve body 131 through the air vent 132 on the cover 1315. At the same time, the gas inside the battery 100 presses the second closing member 136 against the outer surface of the outer wall 1311 from the circumference of the outer wall 1311, so that the second closing member 136 closes the air inlet 133, thereby realizing the external discharge of the gas inside the battery 100.

[0143] Please refer to Figure 8 When the air pressure inside the battery 100 is lower than the air pressure outside, the gas first gathers in the second chamber 139 and squeezes the second sealing member 136, so that the lower part of the second sealing member 136 is separated from the outer wall 1311, and the air inlet 133 is connected with the second chamber 139. The gas flows along the hollow arrow and flows out of the valve body 131 through the air inlet 133. At the same time, the gas presses the first sealing member 135 against the inner surface of the inner wall 1312 from the circumference of the inner wall 1312, so that the first sealing member 135 closes the air inlet 133, so that the gas outside the battery 100 flows into the interior of the battery 100;

[0144] Please refer to Figure 7When the inner air pressure of the battery 100 is equal to the outer air pressure, the first closing member 135 and the second closing member 136 are not acted upon by force, the first closing member 135 closes the exhaust port 134, and the second closing member 136 closes the air inlet 133. At this time, the balancing valve 13 is in a balanced state.

[0145] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A balancing valve, used for a box, characterized in that: include: Valve body; A breathable membrane, which divides the interior of the valve body into a first chamber and a second chamber; The wall of the valve body forming the first chamber is provided with an air vent, the wall of the valve body forming the second chamber is provided with an air inlet and an air outlet, the balancing valve further comprises a first closing member and a second closing member, the first closing member is provided on the inner surface of the valve body, and the second closing member is provided on the outer surface of the valve body; When the air pressure inside the box is greater than the air pressure outside the box, the first sealing member is configured to open the exhaust port; When the air pressure outside the box is greater than the air pressure inside the box, the second sealing member is configured to open the air inlet; When the air pressure inside the box is equal to the air pressure outside the box, the first sealing member seals the exhaust port, and the second sealing member seals the air inlet.

2. The balancing valve according to claim 1, characterized in that: The first closure member and the second closure member are configured such that an opening pressure of the first closure member is greater than an opening pressure of the second closure member.

3. The balancing valve according to claim 1, characterized in that: The first closure member and the second closure member are both made of elastomeric material.

4. The balancing valve according to claim 3, characterized in that: The elastic material is silicone, plastic or rubber.

5. The balancing valve according to any one of claims 1 to 4, characterized in that: The hardness of the first sealing member is smaller than the hardness of the second sealing member.

6. The balancing valve according to any one of claims 1 to 4, characterized in that: The thickness of the first sealing member is smaller than the thickness of the second sealing member.

7. The balancing valve according to any one of claims 1 to 4, characterized in that: The area of ​​the exhaust port is larger than the area of ​​the intake port.

8. The balancing valve according to any one of claims 1 to 4, characterized in that: The valve body comprises an outer wall and an inner wall, the outer wall and the inner wall are both annular, the outer wall is arranged around the inner wall and spaced from each other; The air inlet is arranged on the outer side wall, the air outlet is arranged on the inner side wall, the first sealing piece is sleeved on the inner side wall, and the second sealing piece is sleeved on the outer side wall.

9. The balancing valve according to claim 8, characterized in that: A plurality of air inlets are provided, and the plurality of air inlets are distributed at intervals along the circumference of the outer side wall.

10. The balancing valve according to claim 8, characterized in that: A plurality of exhaust ports are provided, and the plurality of exhaust ports are distributed at intervals along the circumference of the inner side wall.

11. The balancing valve according to claim 8, characterized in that: The valve body also includes a first bottom wall and a second bottom wall, the inner wall is arranged around the first bottom wall, the outer wall is arranged around the second bottom wall, one end of the inner wall in the axial direction is connected to the first bottom wall, the other end of the inner wall in the axial direction is connected to the second bottom wall, and the second bottom wall connects the outer wall and the inner wall.

12. The balancing valve according to claim 11, characterized in that: One end of the first closing piece abuts against the second bottom wall, and the other end of the first closing piece does not extend beyond the first bottom wall.

13. The balancing valve according to claim 11, characterized in that: A first step surface is formed on the outer peripheral surface of the outer side wall, one end of the second sealing member abuts against the first step surface, and the other end of the second sealing member does not extend beyond the second bottom wall.

14. The balancing valve according to claim 11, characterized in that: A second step surface is formed on the inner peripheral surface of the outer side wall, and the edge of the breathable membrane is connected to the second step surface.

15. The balancing valve according to claim 11, characterized in that: The valve body further comprises a cover body, an end of the outer side wall away from the second bottom wall forms an opening, the cover body seals the opening, and the air vent is arranged on the cover body.

16. A battery, characterized in that: include: Box; The balancing valve according to any one of claims 1 to 15, wherein the balancing valve is mounted on a wall of the box, and is used to balance the air pressure inside and outside the box.

17. An electrical equipment, characterized in that: The electric device comprises the battery as claimed in claim 16, and the battery is used to provide electric energy.

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