Explosion-proof valve and battery monomer

Abstract

The embodiment of the utility model provides an anti-explosion valve and a battery cell, and relates to the field of new energy batteries. The explosion-proof valve comprises a shell, a balance membrane, a movable part and a coil. The shell is provided with a channel, and the balance film is installed in the channel and divides the channel into a first channel section and a second channel section. The first channel section is communicated with the internal space of the battery, and the second channel section is communicated with the outside. The movable part is movably arranged in the first channel section. The movable part is provided with an iron core and a puncture part, the iron core is movably sleeved with the coil, the puncture part is opposite to the balance film, and the puncture part can be close to the balance film under the action of electromagnetic force generated by the coil so as to puncture the balance film. According to the anti-explosion valve and the battery monomer, the situation that the anti-explosion valve is not opened in place can be avoided, so that the reliability of opening the anti-explosion valve is improved.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the field of new energy batteries, and in particular to an explosion-proof valve and a battery cell. BACKGROUND

[0002] With the continuous development of energy storage technology, new energy batteries are increasingly widely used in electric vehicles, portable computing devices and other power-consuming devices. During the charging and discharging process of the battery pack, the battery cells in the battery pack will produce chemical reactions, generating heat and smoke. If the internal pressure of the battery pack is too high, the high-pressure smoke will burst through the battery pack shell and cause an explosion. Therefore, timely pressure relief is a key means to ensure the safety of the battery pack.

[0003] The existing battery cell is usually provided with an explosion-proof valve. The explosion-proof valve is in a closed state when the internal pressure of the battery cell is normal, and is opened when the internal pressure of the battery cell is too high, thereby timely releasing the internal pressure of the battery cell and avoiding explosion or fire of the battery cell.

[0004] However, the opening of the existing explosion-proof valve usually depends on the automatic rupture of the diaphragm, and the opening force and the size of the opening are completely dependent on the size of the pressure difference between the inside and outside of the battery pack. When the internal pressure of the battery cell is too low, the explosion-proof valve may not open properly, so that the internal gas of the battery cell cannot be discharged in time and sufficiently, and the reliability of the explosion-proof valve is low. Therefore, how to improve the reliability of the explosion-proof valve has become a technical problem to be solved. UTILITY MODEL CONTENT

[0005] In view of the above problems, the present application provides an explosion-proof valve. The movable part of the explosion-proof valve can be close to the balance membrane under the action of the electromagnetic force generated by the coil to pierce the balance membrane, so that the explosion-proof valve can be opened in time and sufficiently under any pressure value through electromagnetic action, avoiding the situation that the explosion-proof valve does not open properly, and further improving the reliability of the explosion-proof valve. The present application also provides a battery cell comprising the explosion-proof valve.

[0006] In one aspect of the present application, an explosion-proof valve is provided. The explosion-proof valve comprises a housing, a balance membrane, a movable part and a coil. The housing is provided with a passage, and the balance membrane is installed in the passage and divides the passage into a first passage section and a second passage section. The first passage section is used to communicate with the internal space of the battery, and the second passage section is used to communicate with the outside. The movable part is movably arranged in the first passage section, and the movable part has an iron core and a piercing part. The iron core is movably sleeved in the coil, and the piercing part is opposite to the balance membrane. The piercing part can be close to the balance membrane under the action of the electromagnetic force generated by the coil to pierce the balance membrane.

[0007] In the explosion-proof valve, when the battery is in normal operation, the balance film can balance the pressure difference between the inside of the battery and the outside, and can ensure the normal and stable operation of the battery. When the battery is in thermal runaway, the gas pressure in the battery rises, at this time, only need to make the coil energized, can drive the puncture piece to pierce the balance film through electromagnetic action, so as to quickly complete the valve opening process, and the valve opening is not in place, the reliability of the explosion-proof valve opening is higher.

[0008] In an optional manner, the movable piece further has a disc body. The iron core and the puncture part are located on opposite sides of the disc body in the moving direction of the movable piece, and the puncture part protrudes from the disc surface of the disc body in a direction away from the iron core.

[0009] In this way, the disc body can provide support for the iron core and the puncture part, and the disc body can provide positioning for the iron core and the puncture part, so that the movement trajectory of the iron core and the puncture part in the channel is more definite and controllable, which helps the explosion-proof valve to trigger action quickly and accurately, thereby ensuring the reliability of the valve opening.

[0010] In an optional manner, the puncture part is a sharp cone protruding from the disc surface of the disc body.

[0011] In this way, the puncture part in the form of a sharp cone can concentrate the force on a point when contacting the balance film, making it easier to pierce the membrane. This not only improves the piercing efficiency, but also reduces the energy consumption required during the piercing process, ensuring that the valve opening is more reliable.

[0012] In an optional manner, at least one through hole is provided on the disc body, and the through hole is consistent with the ventilation direction of the channel.

[0013] In this way, the provision of the channel can avoid obstruction of the channel by the disc body, ensuring smooth flow of gas in the channel, thereby ensuring smooth and efficient release of gas, improving the response speed and reliability of the explosion-proof valve.

[0014] In an optional manner, the explosion-proof valve further comprises a sealing piece. A first step surface is provided at the joint of the first channel segment and the second channel segment, and the first step surface faces the first channel segment. The balance film is attached to the first step surface, and the sealing piece presses the balance film against the first step surface to ensure gapless contact between the balance film and the first step surface.

[0015] In this way, the sealing piece presses the balance film against the first step surface, which is simple in structure and easy to install. Moreover, the sealing piece can ensure the airtightness of the connection between the balance film and the first step surface, thereby ensuring the reliability of the explosion-proof valve.

[0016] In an alternative mode, the explosion-proof valve further comprises an elastic member. The elastic member is connected to the movable member and applies a restoring elastic force to the movable member away from the balance film. When the coil is not energized, the movable member is away from the balance film under the action of the restoring elastic force. When the coil is energized, the movable member overcomes the restoring elastic force to approach the balance film under the action of the electromagnetic force generated by the coil.

[0017] In this mode, the elastic member can ensure that the explosion-proof valve does not have the phenomenon of false opening. At the same time, the elastic member can make the movable member reset in time after piercing the balance film, thereby ensuring smooth flow of gas and higher stability and reliability of valve opening.

[0018] In an alternative mode, the elastic member is a spring, and the spring is sleeved on the outer periphery of the iron core.

[0019] This mode can avoid the spring from falling off or loosening, so that the movable member can stably bear the restoring elastic force.

[0020] In an alternative mode, the explosion-proof valve further comprises a reset disc. The reset disc is fixed in the first channel segment, the movable member is movably arranged between the reset disc and the balance film, and the movable member is elastically connected to the reset disc through the elastic member.

[0021] In this mode, the reset disc can support the channel wall, improving the structural stability of the explosion-proof valve. At the same time, the reset disc provides a stable force bearing platform for the movable member, provides an installation position for the elastic member, and provides a movement reference for the movable member, so that the movable member can move smoothly along the preset track, thereby ensuring that the movable member can be reliably pierced.

[0022] In an alternative mode, a second stepped surface facing the second channel segment is arranged in the first channel segment. The second stepped surface has a spacing with the balance film, and the reset disc abuts against the second stepped surface.

[0023] In this mode, the second stepped surface has a certain spacing with the balance film, ensuring that the reset disc is installed at a proper distance from the balance film, providing sufficient space for the movement of the movable member. At the same time, the second stepped surface provides a clear positioning point for the reset disc, facilitating the positioning and installation of the reset disc.

[0024] Another aspect of the embodiments of the present application provides a battery monomer, which comprises an electrode assembly, a shell, and the explosion-proof valve of any one of the above. The electrode assembly is sealingly installed in the shell, and the explosion-proof valve is installed on the shell. The explosion-proof valve is used to open when the battery monomer is in thermal runaway, so as to discharge the gas in the internal space of the shell.

[0025] The balance film can balance the pressure difference between the internal space of the battery monomer and the external environment, and can ensure the normal and stable operation of the battery monomer. When the battery monomer is in thermal runaway, the gas pressure in the battery monomer rises. At this time, only the coil is energized, and the puncture member can be driven to pierce the balance film through electromagnetic action, so that the valve opening process is quickly completed, and the valve opening is not in place. The explosion-proof valve of the battery monomer is reliable, and the safety of the battery monomer is higher.

[0026] In the explosion-proof valve and the battery monomer provided by the embodiment of the application, the balance film of the explosion-proof valve closes the channel of the explosion-proof valve, and the movable piece can pierce the balance film under the electromagnetic force generated by the coil, so that the explosion-proof valve can be timely and fully opened under any gas pressure value through electromagnetic action, avoiding the situation that the explosion-proof valve is not opened in place, and further improving the reliability of the explosion-proof valve.

[0027] The above description is only a summary of the technical solutions of the embodiments of the application, and the technical solutions can be implemented according to the content of the specification. In order to make the above and other purposes, characteristics and advantages of the embodiments of the application more obvious and easy to understand, the following specific embodiments of the application are described. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description are some embodiments of the application, and those skilled in the art can also obtain other drawings according to these drawings without creating any creative labor.

[0029] Figure 1 The explosion-proof valve provided by the embodiment of the application is shown in the explosion diagram.

[0030] Figure 2 The cross-sectional view of the explosion-proof valve related to the embodiment of the application is shown.

[0031] Figure 3 The structure diagram of the explosion-proof valve and the movable piece in the first perspective view related to the embodiment of the application is shown.

[0032] Figure 4 The structure diagram of the explosion-proof valve and the movable piece in the second perspective view related to the embodiment of the application is shown.

[0033] Figure 5 The control diagram of the explosion-proof valve related to the embodiment of the application is shown.

[0034] Figure 6 The structure diagram of the explosion-proof valve and the movable piece in the third perspective view related to the embodiment of the application is shown.

[0035] Figure 7 Partial sectional view of the explosion-proof valve involved in the embodiment of the present application.

[0036] Figure 8 Partial sectional view of the explosion-proof valve involved in the embodiment of the present application.

[0037] Figure 9 Structure schematic view of the reset disc involved in the embodiment of the present application.

[0038] Reference signs:

[0039] 10, housing; 11, passage; 111, first passage section; 112, second passage section; 113, first step surface; 114, second step surface;

[0040] 20, balance film; 30, movable member; 31, iron core; 32, puncture part; 33, disc body; 331, through hole;

[0041] 40, coil; 50, sealing member; 60, elastic member; 70, reset disc; 71, center hole; 80, end cover; 90, air guide disc. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme of the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without any creative work under the premise, belong to the scope of protection of the present application.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application.

[0044] The terms "comprising" and "having" and any variations thereof used in the specification and claims herein are intended to cover both the case where the relevant feature is present and the case where the relevant feature is not present. The word "a" or "an" does not exclude the presence of more than one.

[0045] Reference to "an embodiment" herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. Those skilled in the art will appreciate that embodiments described herein can be combined with other embodiments in various ways.

[0046] The term "and / or", merely describes association relationship of associated objects, and means that three relationships can exist, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the present application generally means that the front and rear associated objects are in an "or" relationship.

[0047] The orientation words appearing in the following description are the directions shown in the drawings, and are not limited to the specific structure of the explosion-proof valve and the battery cell of the present application. For example, in the description of the present application, the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0048] In addition, the expressions of the indicating directions for describing the operation and structure of each component of the explosion-proof valve and the battery cell of the present application, such as X direction, Y direction and Z direction, are not absolute but relative, and although these indications are appropriate when each component of the explosion-proof valve and the battery cell is in the position shown in the drawings, these directions should be interpreted differently to correspond to the changes when these positions change.

[0049] In addition, the terms "first", "second", and the like in the specification and claims of the present application or the above drawings are used to distinguish different objects, and are not used to describe a particular order, and can explicitly or implicitly include one or more of the features.

[0050] In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more (including two), and similarly, "a plurality of groups" means two or more groups (including two groups).

[0051] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, the "connection" or "connecting" of mechanical structure can mean physical connection, for example, the physical connection can be fixed connection, for example, fixed connection by screws, bolts or other fixing members; the physical connection can also be detachable connection, for example, mutual clamping or clamping connection; the physical connection can also be integrally connected, for example, welding, bonding or integrally formed connection. The "connection" or "connecting" of circuit structure can mean not only physical connection, but also electrical connection or signal connection, for example, it can be direct connection, that is, physical connection, or indirect connection through at least one intermediate element, as long as the circuit is connected, it can also be the connection inside two elements; the signal connection can be signal connection through circuit, or signal connection through medium, for example, radio wave. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific situation.

[0052] The explosion-proof valve provided by the embodiments of the present application is applied to a battery, and can be applied to a battery monomer or a battery pack with multiple battery monomers. If the explosion-proof valve is exemplarily described below by taking the battery monomer as an example, the battery monomer can be replaced by the battery pack in the specific implementation manner. The explosion-proof valve is as shown in Figure 1 and Figure 2 , the explosion-proof valve provided by the embodiments of the present application is as shown in Figure 1 , and the cross-sectional view of the explosion-proof valve related to the embodiments of the present application is as shown in Figure 2 , wherein the explosion-proof valve comprises a shell 10, a balance film 20, a movable element 30 and a coil 40.

[0053] The shell 10 is the main structure of the explosion-proof valve, and is used to provide mounting positions and supports for other components. The shell 10 is usually made of a material that is firm and corrosion-resistant, so as to ensure that it can withstand certain pressure and temperature. The shell 10 has good sealing performance, so as to prevent external gas or liquid from entering the inside of the battery through the gap, and also prevent the substances in the inside of the battery from leaking to the outside.

[0054] The shell 10 is provided with a passage 11 for gas to pass through. The shape and size of the passage 11 can be determined according to the specific application scene, and the passage 11 can be provided in a straight line or a curved line, and the flow cross section of the passage 11 can be provided in a circular shape or a square shape, which is not limited here.

[0055] The balance film 20 is a thin film with certain toughness. As Figure 2As shown, the balance film 20 is installed in the passage 11 and separates the passage 11 into a first passage segment 111 and a second passage segment 112, the first passage segment 111 is used to communicate with the internal space of the battery, and the second passage segment 112 is used to communicate with the outside. When the explosion-proof valve is applied to a battery, the first passage segment 111 is used to communicate with the internal space of the battery. When the explosion-proof valve is applied to a battery pack, the first passage segment 111 is used to communicate with the internal space of the battery pack.

[0056] As shown, the movable member 30 is movably arranged in the first passage segment 111 and is used to pierce the balance film 20 to open the explosion-proof valve. The specific structure of the movable member 30 is shown in Figure 2 Figure 2 , Figure 3 and Figure 4 , Figure 3 is a structural schematic view of the explosion-proof valve and the movable member in the first perspective view according to the embodiments of the present application, Figure 4 is a structural schematic view of the explosion-proof valve and the movable member in the second perspective view according to the embodiments of the present application. The movable member 30 has a core 31 and a piercing part 32, the core 31 is movably sleeved in the coil 40, and the piercing part 32 is opposite to the balance film 20. The piercing part 32 can approach the balance film 20 under the action of the electromagnetic force generated by the coil 40 to pierce the balance film 20.

[0057] The core 31 is used to form an electromagnet with the coil 40, thereby providing the movable member 30 with the power to open the valve. The coil 40 is a component for generating electromagnetic force, which is usually made of insulated conductive wire. When the explosion-proof valve does not need to be opened, the coil 40 is not powered, the movable member 30 is located at an initial position away from the balance film 20, and the balance film 20 always closes the passage 11, so that the internal space of the battery is separated from the outside. When the explosion-proof valve needs to be opened, the coil 40 is powered, and the core 31 will move under the action of the electromagnetic force, thereby driving the movable member 30 to approach the balance film 20 until the balance film 20 is pierced.

[0058] The piercing part 32 is a component for piercing the balance film 20 when the valve is opened. The piercing part 32 is made of sharp and strong material, and the piercing part 32 is opposite to the balance film 20. The movable range of the piercing part 32 can make the piercing part 32 pierce the balance film 20. Specifically, when the core 31 drives the movable member 30 to move relative to the balance film 20 under the action of the electromagnetic force, the piercing part 32 will approach the balance film 20 and pierce the balance film 20, so that the passage 11 is no longer closed by the balance film 20, and the internal space of the battery is fully communicated with the outside through the passage 11, thereby completing the opening action, and the high-pressure and high-temperature gas in the battery can flow to the outside without obstruction, thereby avoiding explosion or fire of the battery.

[0059] In this embodiment, the coil 40 is powered when the valve needs to be opened. The opening time of the valve can be measured and controlled by the battery management system. For example,​Figure 5 As shown, Figure 5 The control schematic of the explosion-proof valve is shown in the embodiment. The gas pressure sensor is arranged in the internal space of the battery, and the gas pressure sensor is connected with the battery management system. When the battery management system senses that the gas pressure in the internal space of the battery is less than a preset threshold value through the gas pressure sensor, the battery management system always keeps the coil 40 in a non-energized state, so that the balance film 20 normally works, and the explosion-proof valve is in a closed valve state. When the gas pressure sensor senses that the gas pressure in the internal space of the battery is greater than the preset threshold value, the battery management system controls the coil 40 of the explosion-proof valve to be energized through a voltage signal, and the electromagnetic force generated by the coil 40 drives the puncture part 32 of the movable part 30 to pierce the balance film 20, so that the explosion-proof valve is opened, the high-pressure gas in the battery is released, and explosion and fire are prevented, thereby achieving the explosion-proof purpose.

[0060] In the explosion-proof valve, when the battery normally works, the balance film 20 can balance the pressure difference between the internal space of the battery and the outside, and can ensure the normal and stable operation of the battery. When the battery is in thermal runaway, the gas pressure in the battery rises. At this time, only the coil 40 needs to be energized, the puncture part can be driven to pierce the balance film through electromagnetic action, so that the opening valve process is quickly completed, and the opening valve process is not in place. The reliability of the explosion-proof valve is higher. Moreover, the opening valve action time of the explosion-proof valve can be controlled in the millisecond level, and the opening valve process is more rapid.

[0061] In the embodiment, the iron core 31 and the puncture part of the movable part 30 can be directly connected together, or indirectly connected together through other components. As shown in Figure 2 、 Figure 3 and Figure 4 , the movable part 30 further has a disc body 33. The iron core 31 and the puncture part 32 are located on opposite sides of the disc body 33 in the movement direction of the movable part 30, and the puncture part 32 protrudes away from the iron core 31 from the disc surface of the disc body 33.

[0062] In this way, the disc body 33 is used to provide stable support for the positioning and movement of the puncture part 32. The disc body 33 has two opposite disc surfaces on opposite sides in the movement direction of the movable part 30, and the disc surface is a plane or an approximately planar surface to support the iron core 31 and the puncture part 32.

[0063] The shape and size of the disc body 33 correspond to the shape and size of the channel 11, and the disc body 33 can be specifically provided as a circular disc, a square disc, etc. The disc surface area of the disc body 33 should provide sufficient support area while avoiding excessive contact between the disc body 33 and the inner wall of the channel 11, so as to ensure that the movable part 30 can smoothly move in the channel 11.

[0064] The iron core 31, the disc body 33, and the piercing part 32 are interconnected. These three components can be integrally formed or welded together to form a single structure. The iron core 31 is fixed to one side of the disc body 33, and the piercing part 32 is connected to the other side of the disc body 33 and forms a protruding structure. When the iron core 31 is fitted inside the coil 40, the piercing part 32 is positioned opposite the balance membrane 20, thereby ensuring that the piercing part 32 can reliably pierce the balance membrane 20 when it approaches the balance membrane 20 under the action of electromagnetic force.

[0065] In this method, the disc 33 can provide support for the iron core 31 and the piercing part 32, and the disc 33 can provide positioning for the iron core 31 and the piercing part 32, making the movement trajectory of the iron core 31 and the piercing part 32 in the channel 11 clearer and more controllable, which helps the explosion-proof valve to trigger the action quickly and accurately, thereby ensuring the reliability of valve opening.

[0066] There can be one or more puncture sites 32. The puncture site 32 has many structural forms; one possible approach is as follows: Figure 3 and Figure 4 As shown, the puncture part 32 is a pointed cone protruding from the disc surface of the disc body 33.

[0067] When the puncture part 32 is configured as a sharp cone, the bottom of the cone is tightly connected to the disc body 33, and the apex of the cone is away from the disc body 33 and faces the balance membrane 20. The cone-shaped puncture part 32 can be fixedly connected to the disc body 33 by welding, riveting, or other mechanical connection methods to ensure that the puncture part 32 will not fall off or loosen from the disc body 33 when subjected to external force. When the puncture part 32 approaches the balance membrane 20 with the moving part 30, the tip of the cone will easily puncture the balance membrane 20, thereby causing the explosion-proof valve to open.

[0068] In this method, the cone-shaped puncture part 32 can concentrate the force on one point when it contacts the balance membrane 20, making it easier to puncture the membrane. This not only improves the puncture efficiency but also reduces the energy consumption required during the puncture process, ensuring more reliable valve opening.

[0069] In addition, the puncture part 32 can also be configured as a raised blade-shaped structure, a tooth-shaped structure, etc., without specific limitations.

[0070] In this embodiment, to avoid the disk body 33 blocking the channel 11, one optional method is as follows: Figure 6 As shown, Figure 6 This is a schematic diagram of the explosion-proof valve and moving parts involved in the embodiments of this application from a third-person perspective. The disc body 33 has at least one through hole 331, and the through hole 331 is aligned with the ventilation direction of the channel 11.

[0071] A through hole 331 is provided on the disc 33, which penetrates the disc 33. The through hole 331 is used to allow gas to pass through, so as to avoid the disc 33 from blocking the channel 11. The air passage direction of the through hole 331 is consistent with that of the channel 11. For example, the axis of the through hole 331 can be made parallel to the axis of the channel 11 to ensure that the gas can flow smoothly in the channel 11 through the through hole 331.

[0072] Multiple through holes 331 can be provided to improve ventilation efficiency. The shape of the through holes 331 can be set to an easy-to-manufacture shape such as a circle or an ellipse, or it can be set to other shapes such as a square or a rectangle to meet different needs.

[0073] In this method, the arrangement of channel 11 can prevent the disc 33 from blocking the channel 11, ensuring that the gas can flow smoothly in the channel 11, thereby ensuring that the gas can be released smoothly and efficiently, and improving the response speed and reliability of the explosion-proof valve.

[0074] In this embodiment, to ensure the sealing effect of the balancing membrane 20 on the channel 11, the balancing membrane 20 can be sealed and connected within the channel 11. There are many specific implementation methods; one optional method is as follows: Figure 1 , Figure 7 and Figure 8 As shown, Figure 7 This is a partial cross-sectional view of the explosion-proof valve involved in the embodiments of this application. Figure 8 This is a cross-sectional view of the housing of the explosion-proof valve according to an embodiment of this application. The explosion-proof valve also includes a sealing element 50. A first stepped surface 113 is provided at the junction of the first channel segment 111 and the second channel segment 112, with the first stepped surface 113 facing the first channel segment 111. A balancing membrane 20 is attached to the first stepped surface 113, and the sealing element 50 presses the balancing membrane 20 against the first stepped surface 113 to ensure gapless contact between the balancing membrane 20 and the first stepped surface 113.

[0075] The first step surface 113 is a step surface used to attach the balancing membrane 20. The first step surface 113 is oriented towards the first channel segment 111 and away from the second channel segment 112. The first step surface 113 is a smooth plane to ensure that the balancing membrane 20 can be tightly attached to this surface.

[0076] The balancing membrane 20 can be adhered to the first step surface 113 by adhesive bonding, so that the balancing membrane 20 can be reliably connected in the channel 11. Furthermore, when the balancing membrane 20 is adhered to the first step surface 113, the balancing membrane 20 can completely seal the channel 11.

[0077] The sealing member 50 is configured to ensure the gapless contact between the balance membrane 20 and the first step surface 113, thereby preventing the leakage of gas or liquid from the explosion-proof valve. The sealing member 50 can be configured as a sealing ring or a sealing sheet, etc. corresponding to the first step surface 113. The sealing member 50 can press the balance membrane 20 against the first step surface 113 at the edge position of the balance membrane 20, so that the balance membrane 20 is abutted against the first step surface 113 to achieve the gapless contact between the balance membrane 20 and the first step surface 113. In addition, the sealing member 50 can be connected inside the passage 11 by means of adhesion, clamping or the like, so as to always maintain the gapless contact between the balance membrane 20 and the first step surface 113.

[0078] In this way, the sealing member 50 presses the balance membrane 20 against the first step surface 113, which is simple in structure and convenient to install. In addition, the sealing member 50 can ensure the airtightness of the connection between the balance membrane 20 and the first step surface 113, thereby ensuring the reliability of the explosion-proof valve.

[0079] In the embodiment, the movable member 30 can also be configured as a resettable structure. An optional way is shown in Figure 1 and Figure 2 The explosion-proof valve further comprises an elastic member 60. The elastic member 60 is connected to the movable member 30 and applies a reset elastic force to the movable member 30 to move away from the balance membrane 20. When the coil 40 is not energized, the movable member 30 moves away from the balance membrane 20 under the action of the reset elastic force. When the coil 40 is energized, the movable member 30 overcomes the reset elastic force to move close to the balance membrane 20 under the action of the electromagnetic force generated by the coil 40.

[0080] The elastic member 60 is an elastic structure for providing the reset elastic force. The elastic member 60 can be of various types, and can be configured as a coil spring, a leaf spring, a wave spring, a spring sheet, etc. For example, the elastic member 60 can be a spring, and the spring is always in a stretched state to always provide the reset elastic force to the movable member 30.

[0081] The elastic member 60 can be directly connected to the movable member 30 by means of hanging, abutting or clamping, etc. to ensure that the elastic member 60 can stably apply the reset elastic force, while allowing the movable member 30 to move smoothly when subjected to the electromagnetic force.

[0082] An optional way is shown in Figure 1 and Figure 2 The elastic member 60 is a spring, and the spring is sleeved on the outer periphery of the iron core 31 to avoid the spring from falling off or loosening, so that the movable member 30 can stably bear the reset elastic force.

[0083] The elastic element 60 is connected to the movable element 30, ensuring that the movable element 30 is always subjected to a restoring force. When the coil 40 is not energized, the movable element 30 remains in its initial position away from the balance membrane 20 under the action of the elastic force, and the explosion-proof valve is in a closed state. When the coil 40 is energized, the electromagnetic force generated by the coil 40 overcomes the restoring force of the elastic element 60 and pushes the movable element 30 towards the balance membrane 20, achieving a puncture action and thus puncturing the balance membrane 20, causing the explosion-proof valve to switch to the open state. Furthermore, after the explosion-proof valve switches to the open state, the coil 40 is de-energized, and the movable element 30 can quickly return to its initial position under the action of the restoring force of the elastic element 60, thereby making room for gas flow and ensuring that the gas can be fully discharged.

[0084] In this method, the elastic element 60 ensures that the explosion-proof valve does not open accidentally. Simultaneously, the elastic element 60 allows the moving part 30 to promptly reset after puncturing the balance membrane 20, thus ensuring smooth gas flow and resulting in higher stability and reliability of valve opening.

[0085] The elastic element 60 elastically connects the movable element 30 relative to the housing 10, so that the movable element 30 can move within the first channel 11. The elastic element 60 can be directly connected to the housing 10, or it can be indirectly connected to the housing 10 through other specially designed components.

[0086] For example, one alternative approach is as follows: Figure 2 and Figure 9 As shown, Figure 9 This is a schematic diagram of the reset plate involved in the embodiments of this application. The explosion-proof valve also includes a reset plate 70. The reset plate 70 is fixed within the first channel section 111, and a movable member 30 is movably disposed between the reset plate 70 and the balance diaphragm 20. The movable member 30 is elastically connected to the reset plate 70 via an elastic member 60.

[0087] The reset plate 70 is a structure used to connect the elastic element 60. The reset plate 70 can be made of metal, plastic, or other non-metallic materials. The reset plate 70 is fixed within the first channel section 111, specifically by being snapped into the first channel section 111, or by being fixedly connected by means of threads, welding, etc., to ensure that the reset plate 70 will not loosen or fall off. Furthermore, there is a gap between the reset plate 70 and the balance membrane 20, the distance of which allows the movable element 30 to move smoothly and ensures that the movable element 30 can puncture the balance membrane 20 when it moves.

[0088] The shape of the reset disk 70 corresponds to the shape of the channel 11. The reset disk 70 can be specifically configured as a circular disk, a square disk, etc. In addition, the reset disk 70 can also be provided with holes for gas to pass through, so as to avoid the reset disk 70 blocking the channel 11 and preventing the channel 11 from being unable to pass gas.

[0089] The reset disc 70 and the elastic member 60 can be connected in many ways, and the reset disc 70 can be connected with the elastic member 60 through hanging, abutting, clamping and the like. Moreover, the reset disc 70 and the movable member 30 are respectively connected with opposite ends of the elastic member 60, so that the movable member 30 and the reset disc 70 are elastically connected.

[0090] For example, a center hole 71 can be arranged on the reset disc 70, the iron core 31 passes through the center hole 71 and is sleeved in the coil 40, the elastic member 60 is a spring, the spring is sleeved on the iron core 31, and one end of the spring is connected to the disc body 33 or other parts of the movable member 30, and the other end of the spring is connected to the reset disc 70. At the same time, the spring is arranged in the center hole 71, so that the overall structure is compact and the occupied space is reduced.

[0091] In this way, the reset disc 70 can support the wall of the channel 11, improving the structural stability of the explosion-proof valve. At the same time, the reset disc 70 provides a stable force bearing platform for the movable member 30, provides a mounting position for the elastic member 60, and provides a movement reference for the movable member 30, so that the movable member 30 can move smoothly along the preset track, thereby ensuring that the movable member 30 can be reliably punctured.

[0092] In order to ensure that the reset disc 70 can be installed at a preset position, the reset disc 70 can be installed with the aid of a positioning structure in the channel 11. One optional way is as shown in Figure 2 and Figure 8 A second step surface 114 facing the second channel segment 112 is arranged in the first channel segment 111. The second step surface 114 has a spacing with the balance film 20, and the reset disc 70 abuts against the second step surface 114.

[0093] The second step surface 114 is the positioning structure arranged in the first channel segment 111, and the second step surface 114 faces the balance film 20. After the reset disc 70 abuts against the second step surface 114, the disc surface of the reset disc 70 faces the balance film 20, so that the reset disc 70 is installed at a preset position.

[0094] In this way, the second step surface 114 has a certain spacing with the balance film 20, which ensures that the reset disc 70 is installed at a distance apart from the balance film 20, and provides sufficient space for the movement of the movable member 30. At the same time, the second step surface 114 provides a clear positioning point for the reset disc 70, facilitating the positioning and installation of the reset disc 70.

[0095] In addition, other structures can be arranged on the explosion-proof valve to enrich the functions of the explosion-proof valve. For example, as shown in Figure 1 and Figure 2As shown, the end of the first passage 111 of the explosion-proof valve can be connected with an end cover 80 by interference fit or the like, and the end cover 80 can be provided with a hole for gas to pass through, so that the overall structure is more stable. And, the second passage segment 112 can be provided with a gas guide disc 90 in the form of clamping or the like, and the gas guide disc can also be provided with a hole for gas to pass through, so that the overall structure is more stable, and the gas flow is guided.

[0096] The above first embodiment describes an explosion-proof valve in detail, and the following second embodiment describes a battery monomer including the explosion-proof valve of the above first embodiment, as follows.

[0097] The battery monomer includes an electrode assembly, a housing, and the explosion-proof valve of any one of the above. The electrode assembly is sealingly installed in the housing, and the explosion-proof valve is installed on the housing. The explosion-proof valve is used to open when the battery monomer is in thermal runaway, so as to discharge the gas in the internal space of the housing.

[0098] The explosion-proof valve on the battery pack can be one or more. The specific structure of the explosion-proof valve corresponds to the explosion-proof valve of the foregoing embodiments, and the specific structure of the explosion-proof valve is described in any one of the embodiments related to the explosion-proof valve. Similarities are not described in detail in this embodiment.

[0099] The housing of the battery monomer is provided with a mounting hole, and the explosion-proof valve passes through the mounting hole. The first passage segment of the explosion-proof valve communicates with the internal space of the housing. And the explosion-proof valve can be sealingly connected to the mounting hole by a sealing ring, a flange plate or the like.

[0100] In the battery monomer, when the battery monomer is in normal operation, the balance film can balance the pressure difference between the internal space of the battery monomer and the outside, and can ensure the normal and stable operation of the battery monomer. When the battery monomer is in thermal runaway, the gas pressure in the battery monomer rises. At this time, only the coil is energized, and the piercing member can be driven to pierce the balance film by electromagnetic action, so as to quickly complete the valve opening process, and the valve opening is not in place. The explosion-proof valve of the battery monomer is reliable, and the safety of the battery monomer is higher.

[0101] In summary, in the above-described explosion-proof valve and battery monomer, the balance film of the explosion-proof valve closes the passage of the explosion-proof valve, and the movable member can be driven to pierce the balance film by the electromagnetic force generated by the coil. The explosion-proof valve can be opened in time and fully under any gas pressure value by electromagnetic action, avoiding the situation that the explosion-proof valve is not opened in place, and further improving the reliability of the explosion-proof valve.

[0102] Those skilled in the art will appreciate that the features of the various embodiments can be combined with each other, where appropriate, in accordance with the application. For example, in the claims, any of the claimed embodiments can be used in any combination.

[0103] The above embodiments are only used to illustrate the technical solutions of the present application, not limit the present application; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An explosion relief valve, characterized in that The explosion-proof valve comprises a housing, a balance film, a movable element and a coil; The housing is provided with a passage, the balance film is installed in the passage and divides the passage into a first passage section and a second passage section; the first passage section is used for communicating with the internal space of the battery, and the second passage section is used for communicating with the outside world; The movable element is movably arranged in the first passage section; the movable element has an iron core and a piercing part, the iron core is movably sleeved in the coil, and the piercing part is opposite to the balance film; the piercing part can be close to the balance film under the action of the electromagnetic force generated by the coil to pierce the balance film.

2. The explosion relief valve of claim 1, wherein The movable element further has a disc body; The iron core and the piercing part are located on opposite sides of the disc body in the moving direction of the movable element, and the piercing part protrudes away from the iron core from the disc surface of the disc body.

3. The explosion relief valve of claim 2, wherein, The piercing part is a sharp cone protruding from the disc surface of the disc body.

4. Explosion relief valve according to claim 2 or 3, characterized in that At least one through hole is arranged on the disc body, and the through hole is consistent with the ventilation direction of the passage.

5. The explosion relief valve of claim 1, wherein, The explosion-proof valve further comprises a sealing element; A first step surface is arranged at the joint of the first passage section and the second passage section, and the first step surface faces the first passage section; The balance film is attached to the first step surface, and the sealing element abuts the balance film against the first step surface to make the balance film in gapless contact with the first step surface.

6. The explosion relief valve of claim 1, wherein The explosion-proof valve further comprises a resilient element; The resilient element is connected to the movable element and applies a reset elastic force to the movable element away from the balance film; When the coil is not powered, the movable element is away from the balance film under the action of the reset elastic force; when the coil is powered, the movable element overcomes the reset elastic force to be close to the balance film under the action of the electromagnetic force generated by the coil.

7. The explosion relief valve of claim 6, wherein, The resilient element is a spring, and the spring is sleeved on the outer periphery of the iron core.

8. The explosion relief valve of claim 6, wherein, The explosion-proof valve further comprises a reset disc; The reset disc is fixed in the first passage section, the movable element is movably arranged between the reset disc and the balance film, and the movable element is elastically connected to the reset disc through the resilient element.

9. The explosion relief valve of claim 8, wherein, A second step surface facing the second passage section is arranged in the first passage section; The reset disc abuts against the second step surface, and the second step surface has a spacing with the balance film.

10. A battery cell characterized by, The battery monomer comprises an electrode assembly, a shell and an explosion-proof valve according to any one of claims 1-9; The electrode assembly is sealingly installed in the shell, and the explosion-proof valve is installed on the shell; the explosion-proof valve is used to be opened when the battery monomer is in thermal runaway to discharge the gas in the internal space of the shell.

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