Integrated Dual-channel Valve and Battery Cover Plate

Abstract

The present application provides an integrated dual-channel valve and a battery cover plate. The integrated dual-channel valve includes a first one-way valve and a second one-way valve. The first one-way valve includes a first channel that allows a first fluid to pass through in a first direction; the second one-way valve includes a second channel that allows a second fluid to pass through in a second direction. Wherein, the first one-way valve and the second one-way valve are integrally designed, and the first one-way valve and the second one-way valve are sleeved together. The integrated dual-channel valve is installed on the battery cover plate. During the formation process, the first channel is used to evacuate the air, and the second channel is used to inject liquid. The two channels for air extraction and liquid injection do not interfere with each other, and the integrated dual-channel valve has an automatic sealing function. During processes such as pre-formation and secondary liquid injection, there is no need for repeated plugging and unplugging processes similar to formation nails, saving time and ensuring the sealing problem during the formation process.

Description

Technical Field

[0001] This application relates to the field of lithium-ion battery equipment, and particularly to an integrated dual-channel valve and a battery cover plate equipped with the integrated dual-channel valve. Background Art

[0002] Currently, driven by existing policies and the market, the demand for lithium-ion power batteries is increasing day by day, and at the same time, higher requirements are put forward for the mass production efficiency of lithium-ion power batteries. In the current formation process, there is a liquid injection hole on the cover plate of the lithium-ion power battery. When the lithium-ion power battery needs to be filled with liquid, it is filled through the liquid injection hole. After the first liquid injection, the formation nail is used to block the liquid injection hole. If secondary liquid injection is required, the formation nail needs to be pulled out for liquid replenishment. After liquid replenishment, the formation nail is inserted again, and a charge and discharge cycle is carried out. After completion, the formation nail is pulled out to evacuate the inside of the battery cell, and finally, a sealing nail and a PIN nail are inserted to completely seal the liquid injection hole.

[0003] In this process, the formation nail needs to be inserted and pulled out multiple times, resulting in low production efficiency. The sealing reliability during the use of the formation nail cannot be well guaranteed, and after the formation nail is used, replacing it with a sealing nail requires another device for assembly, increasing the equipment cost.

[0004] Therefore, it is necessary to design a device to replace the formation nail and a battery cover plate equipped with the device to solve the technical problem of inserting and pulling out the formation nail multiple times in the formation process. Summary of the Invention

[0005] This application aims to solve the technical problems of low production efficiency and poor sealing reliability caused by inserting and pulling out the formation nail multiple times in the formation process.

[0006] To solve the above technical problems, this application discloses an integrated dual-channel valve, including: a first one-way valve including a first channel configured to allow a first fluid to pass through in a first direction; and a second one-way valve including a second channel configured to allow a second fluid to pass through in a second direction, wherein the first one-way valve and the second one-way valve are integrally designed, and the first one-way valve and the second one-way valve are sleeved together.

[0007] In some embodiments, the second one-way valve and the first one-way valve are coaxially distributed.

[0008] In some embodiments, the first one-way valve includes: a first valve core, the first valve core including a first coupling surface and a second coupling surface; a first substrate, the first substrate including a third coupling surface and a fourth coupling surface; and a first elastic member. Wherein, the first coupling surface and the third coupling surface are coupled, a first end of the first elastic member abuts against the second coupling surface, a second end of the first elastic member abuts against the fourth coupling surface, the first elastic member is in a compressed state, generating a first elastic force, applying a first external force to the first valve core along a first direction. When the first external force is greater than the first elastic force, the first valve core moves along the first direction, the first coupling surface and the third coupling surface are decoupled, and the first channel is opened. When the first external force is less than or equal to the first elastic force, the first valve core presses against the first substrate, the first coupling surface and the third coupling surface are coupled, and the first channel is closed.

[0009] In some embodiments, the first valve core is at least one of a frustum of a cone and a stepped cylinder.

[0010] In some embodiments, the second one-way valve includes: a second valve core, the second valve core including a fifth coupling surface and a sixth coupling surface; a second substrate, the second substrate including a seventh coupling surface and an eighth coupling surface; and a second elastic member. Wherein, the fifth coupling surface and the seventh coupling surface are coupled, a first end of the second elastic member abuts against the sixth coupling surface, a second end of the second elastic member abuts against the eighth coupling surface, the second elastic member is in a compressed state, generating a second elastic force, applying a second external force to the second valve core along a second direction. When the second external force is greater than the second elastic force and the second external force is less than or equal to the first elastic force, the second valve core moves along the second direction, the fifth coupling surface and the seventh coupling surface are decoupled, and the second channel is opened. When the second external force is less than or equal to the second elastic force, the second valve core presses against the second substrate, the fifth coupling surface and the seventh coupling surface are coupled, and the second channel is closed.

[0011] In some embodiments, the second valve core is at least one of a frustum of a cone and a stepped cylinder.

[0012] In some embodiments, the stiffness of the first elastic member is greater than the stiffness of the second elastic member.

[0013] In some embodiments, the first one-way valve further includes a first seal, and the second one-way valve further includes a second seal.

[0014] In some embodiments, the integrated two-channel valve may further include a bottom cover plate configured to connect the first one-way valve and the second one-way valve.

[0015] In some embodiments, the bottom cover plate includes at least one through hole, and when the second fluid passes through the second channel, it passes through the through hole.

[0016] In some embodiments, the bottom cover plate may further include a groove, and an assembly tool is inserted into the groove to rotationally drive the first one-way valve and the second one-way valve to be connected together.

[0017] The present application also discloses a battery cover plate, and the integrated dual-channel valve of the present application is fixed on the battery cover plate.

[0018] In some embodiments, the battery cover plate is coupled to the first substrate.

[0019] The integrated dual-channel valve of the present application, through a special design of the mechanical structure, forms a dual-channel in which vacuum pumping and liquid injection do not interfere with each other during the formation process, and each independent channel can be automatically closed under the action of a spring. The design of the seal ensures the sealing performance after the channel is closed. During the processes of pre-formation, secondary liquid injection, etc., there is no need for repeated plugging and unplugging processes similar to formation nails, saving time and also ensuring the sealing function during the formation process.

[0020] Furthermore, the integrated dual-channel valve of the present application can be produced modularly and adapted to different top covers.

[0021] Furthermore, the integrated dual-channel valve of the present application and the battery cover plate only need to be assembled once, saving a station for plugging and unplugging formation nails during the production process and saving equipment costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is an assembly drawing of the integrated dual-channel valve and a battery cover plate in some embodiments of the present application;

[0023] Figure 2 It is a structural diagram of the integrated dual-channel valve in some embodiments of the present application;

[0024] Figure 3 It is a structural diagram of the first one-way valve in some embodiments of the present application;

[0025] Figure 4 It is a structural diagram of the second one-way valve in some embodiments of the present application;

[0026] Figure 5 It is a rotating cross-sectional view of the integrated dual-channel valve in some embodiments of the present application;

[0027] Figure 6 It is a structural diagram of the bottom cover plate in some embodiments of the present application;

[0028] Figure 7Structural diagram of an integrated dual-channel valve in some embodiments of the present application. Detailed implementation manners

[0029] The following description provides specific application scenarios and requirements of the present application, aiming to enable those skilled in the art to manufacture and use the content of the present application. For those skilled in the art, various partial modifications to the disclosed embodiments are obvious, and without departing from the spirit and scope of the present disclosure, the general principles defined here can be applied to other embodiments and applications. Therefore, the present disclosure is not limited to the illustrated embodiments, but has the broadest scope consistent with the claims.

[0030] The terms used here are only for the purpose of describing specific example embodiments and are not restrictive. For example, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" used here may also include the plural forms. When used in this specification, the terms "comprises", "comprising" and / or "having" mean that the associated integers, steps, operations, elements and / or components exist, but do not exclude the existence of one or more other features, integers, steps, operations, elements, components and / or groups, or the addition of other features, integers, steps, operations, elements, components and / or groups in the system / method. When used in this specification, the term "A on B" may mean that A is directly adjacent to B (above or below), or may mean that A is indirectly adjacent to B (that is, there is some substance between A and B); the term "A in B" may mean that A is entirely inside B, or may mean that A is partially inside B.

[0031] Considering the following description, these features and other features of the present disclosure, as well as the operations and functions of the related elements of the structure, and the combination and manufacturing economy of the components can be significantly improved. Referring to the accompanying drawings, all of these form a part of the present disclosure. However, it should be clearly understood that the drawings are only for the purpose of illustration and description, and are not intended to limit the scope of the present disclosure.

[0032] The following description can significantly improve these and other features of the present disclosure, as well as the operations and functions of the related elements of the structure, and the economic efficiency of the combination and manufacturing of the components. All of these form a part of the present disclosure with reference to the accompanying drawings. However, it should be clearly understood that the drawings are only for the purpose of illustration and description, and are not intended to limit the scope of the present disclosure. It should also be understood that the drawings are not drawn to scale.

[0033] Figure 1 is an assembly diagram of an integrated dual-channel valve 100 and a battery cover plate 200 in some embodiments of the present application; Figure 2It is a structural diagram of the integrated dual-channel valve 100 in some embodiments of the present application. The integrated dual-channel valve 100 can be applied in different scenarios. For example, the integrated dual-channel valve 100 can be installed on the lithium battery cover plate and configured as the liquid injection hole of the lithium battery. Specifically, the integrated dual-channel valve 100 can include a first one-way valve 300 and a second one-way valve 400.

[0034] The first one-way valve 300 and the second one-way valve 400 are integrally designed, and the first one-way valve 300 and the second one-way valve 400 are sleeved together. The first one-way valve 300 can be sleeved outside the second one-way valve 400, or the first one-way valve 300 can also be sleeved inside the second one-way valve 400. For the convenience of description, the present application will describe the present invention by taking the first one-way valve 300 sleeved outside the second one-way valve 400 as an example. In some embodiments, the second one-way valve 400 and the first one-way valve 300 are coaxially distributed. Of course, the second one-way valve 400 can also be non-coaxially distributed with the first one-way valve 300 without departing from the core spirit of the present invention.

[0035] In addition, the integrated dual-channel valve 100 can further include a bottom cover plate 500, and the bottom cover plate 500 is configured to connect the first one-way valve 300 and the second one-way valve 400. Under the condition of completing the function of the integrated dual channel, the bottom cover plate 500 can also be integrally designed with any one or more of the first one-way valve 300, the second one-way valve 400, or the battery cover plate 200, etc. The structure and function of the bottom cover plate 500 will be specifically introduced in other parts of the present invention.

[0036] Figure 3 It is a structural diagram of the first one-way valve 300 in some embodiments of the present invention. The first one-way valve 300 can include a first channel 310. The first channel 310 is configured to allow the first fluid to pass through in the first direction. The first fluid can be a liquid, or the first fluid can also be a gas, such as air, etc.; the first direction can be any direction along the first channel 310. For example, when the integrated dual-channel valve 100 is the liquid injection hole of the battery and the first fluid is air, a vacuum pump can be used to pump air outside the battery cover plate 200, and the first fluid moves along the direction from inside the battery to outside the battery. At this time, the first channel 310 becomes the air extraction channel.

[0037] In some embodiments, the first one-way valve 300 can include a first valve core 320, a first substrate 330, and a first elastic member 340.

[0038] The first substrate 330 can include a through hole 333; the first valve core passes through the through hole 333. The first substrate 330 can be an independent part. For example, in Figure 3 the first substrate 330 is a valve core positioning ring. The first substrate 330 can also be a feature of other parts. For example, in Figure 7Among them, the first substrate 330 is a stepped platform on the battery cover plate 200 that plays a positioning and / or supporting role.

[0039] The first valve core 320 may include a first coupling surface 321 and a second coupling surface 322; the first substrate 330 may include a third coupling surface 331 and a fourth coupling surface 332. The first coupling surface 321 and the third coupling surface 331 are coupled. In some embodiments, the first valve core 320 is at least one of a truncated cone and a cylindrical stepped platform. For example, in Figure 3 Among them, the first valve core 320 is a truncated cone, and the first coupling surface 321 is the conical surface of the truncated cone; correspondingly, the third coupling surface 331 of the first substrate 330 that is coupled to the first coupling surface 321 is also a conical surface. Another example is in Figure 7 Among them, the first valve core 320 is a cylindrical stepped platform. At this time, the first coupling surface 321 is a plane of the cylindrical stepped platform; correspondingly, the third coupling surface 331 of the first substrate 330 that is coupled to the first coupling surface 321 is also a plane. Of course, the first valve core 320 can also be other similar structures.

[0040] The first end of the first elastic member 340 abuts against the second coupling surface 322; the second end of the first elastic member 340 abuts against the fourth coupling surface 332. The first elastic member 340 is sandwiched between the second coupling surface 322 and the fourth coupling surface 332 in a compressed state, thus generating a first elastic force. The direction of the first elastic force is the direction that pushes the second coupling surface 322 away from the fourth coupling surface 332, that is, Figure 3 The opposite direction of the first direction F in

[0041] That is, the first direction F is the direction that makes the first elastic force increase. Therefore, when there is no other external force acting, due to the action of the first elastic force, the first coupling surface 321 and the third coupling surface 331 are in a pressed state. Figure 3

[0042] The first elastic member 340 is configured to drive a first channel 310 to be formed between the first valve core 320 and the first substrate 330 under the action of an external force. The first elastic member 340 may be a spring, and the first elastic member 340 may also be other elastic members, etc. The first elastic force may be a tensile force or a compressive force. For example, in Figure 3 Among them, the first elastic member 340 is a spring, and the first elastic force is the compressive force of the spring. When a first external force is applied to the first valve core 320 along the first direction, when the first external force is greater than the first elastic force, the first valve core 320 moves along the first direction, and the first coupling surface 321 and the third coupling surface 331 are decoupled, opening the first channel 310. When the first external force is less than or equal to the first elastic force, the first valve core 320 presses against the first substrate 330, the first coupling surface 321 and the third coupling surface 331 are coupled, and the first channel 310 is closed.

[0042] Figure 4 It is a structural diagram of the second one-way valve 400 in some embodiments of the present invention. The second one-way valve 400 may include a second channel 410. The second channel 410 is configured to allow a second fluid to pass through in a second direction. The second fluid may be a liquid, and the second liquid may also be a gas; the second direction, that is, the direction in which the second fluid passes through the second channel 410, can be arbitrary. The second direction may be the same as the first direction, or the second direction may be different from the first direction. The second fluid and the first fluid may be different fluids. For example, the first fluid is air and the second fluid is electrolyte. The first fluid and the second fluid may also be the same. For example, both the first fluid and the second fluid are water.

[0043] In some embodiments, the second one-way valve 400 may include a second valve core 420, a second base plate 430, and a second elastic member 440.

[0044] The second base plate 430 may be an integral body connected by different parts. For example, in Figure 4 it is an integral body connected by a bottom cover plate 500 and a first valve core 320. The second base plate 430 may also be integrally designed with one or more of the first one-way valve 300 or the battery cover plate 200. For example, in Figure 7 the second base plate 430 and the first valve core 320 are integrally designed, and the second base plate 430 is also the first valve core 320 itself. Of course, the second base plate 430 may also be an independent part, and is coupled with other parts through threaded connection, interference fit, welding, etc.

[0045] The second valve core 420 may include a fifth coupling surface 421 and a sixth coupling surface 422, and the second base plate 430 may include a seventh coupling surface 431 and an eighth coupling surface 432. The fifth coupling surface 421 and the seventh coupling surface 431 are coupled. In some embodiments, the second valve core 420 is at least one of a frustum of a cone and a cylindrical stepped platform. For example, in Figure 4 the second valve core 420 is a frustum of a cone, and the fifth coupling surface 421 is the conical surface of the frustum of the cone; correspondingly, the seventh coupling surface 431 of the second base plate 430 that is coupled with the fifth coupling surface 421 is also a conical surface. Also, for example, in Figure 7 the second valve core 420 is a cylindrical stepped platform. At this time, the fifth coupling surface 421 is a plane of the cylindrical stepped platform; correspondingly, the seventh coupling surface 431 of the second base plate 430 that is coupled with the fifth coupling surface 421 is also a plane. Of course, the second valve core 420 may also be other similar structures.

[0046] The first end of the second elastic member 440 abuts against the sixth coupling surface 422; the second end of the second elastic member 440 abuts against the eighth coupling surface 432. The second elastic member 440 is sandwiched between the sixth coupling surface 422 and the eighth coupling surface 432 in a compressed state, thus generating a second elastic force. The direction of the second elastic force is the direction of pushing the sixth coupling surface 422 away from the eighth coupling surface 432, that is Figure 4 the opposite direction of the second direction F in

[0047] and the second direction F is the direction in which the second elastic force increases. Therefore, when there is no other external force acting, due to the action of the second elastic force, the fifth coupling surface and the seventh coupling surface are in a pressed state. Figure 4 The second elastic member 440 is configured to drive a second channel 410 to be formed between the second spool 420 and the second substrate 430 under the action of an external force. The second elastic member 440 may be a spring, or the second elastic member 440 may be other elastic members, etc. The second elastic force may be a tensile force or a compressive force. For example, in

[0048] some embodiments, the stiffness of the first elastic member 340 is greater than the stiffness of the second elastic member 440. For example, in Figure 5Among them, the first elastic member 340 and the second elastic member 440 are both springs. The first substrate 330 is a valve core positioning ring fixedly connected to the battery cover plate 200. The first valve core 320 and the bottom cover plate 500 are fixedly connected to form the second substrate 430. When a second external force is applied to the second valve core 420 and the second external force is greater than the second elastic force and less than the first elastic force, the second elastic member 440 elastically deforms and increases, the first elastic member 340 does not elastically deform and increase, the second channel 410 is opened, and at the same time the first channel 310 is closed. Of course, in some embodiments, the stiffness of the first elastic member 340 may also be less than or equal to the stiffness of the second elastic member 440. For example, when the first elastic member 340 and the second elastic member 440 are both springs, the first substrate 330 and the second substrate 430 are respectively two stepped platforms on the battery cover plate 200. The stiffness of the first elastic member 340 may be less than the stiffness of the second elastic member 440, and the stiffness of the first elastic member 340 may also be equal to the stiffness of the second elastic member 440. Of course, at this time, the stiffness of the first elastic member 340 may also be greater than the stiffness of the second elastic member 440, and so on.

[0049] In some embodiments, the first one-way valve 300 may further include a first sealing member 360, and the second one-way valve 400 may further include a second sealing member 460.

[0050] The first sealing member 360 may be designed to enhance the sealing effect after the first channel 310 is closed. The first sealing member 360 may be an O-ring, as Figure 5 shown; the first sealing member 360 may also be a sealing coating applied to the surface of the first valve core 320 and / or the first substrate 330, and so on.

[0051] The second sealing member 460 may be designed to enhance the sealing effect after the second channel 410 is closed. The second sealing member 460 may be an O-ring; the second sealing member 460 may also be a sealing coating applied to the surface of the second valve core 420 or the second substrate 430; the second sealing member 460 may also be the second valve core 420 or the second substrate 430 itself. For example, in Figure 5 , the second valve core 420 is a synthetic part of injection molding and metal. The upper umbrella-shaped structure uses a plastic material, which can provide better sealing performance. The lower part uses a metal material to cooperate with the second elastic member 440 and is not easy to wear, and so on.

[0052] In some embodiments, the bottom cover plate 500 may include at least one through hole 510, and the through hole 510 is configured to ensure the penetration of the second channel 410. The cross-section of the through hole 510 may be any shape. For example, in Figure 6 , the cross-sectional shape of the through hole 510 is an arc waist shape.

[0053] In some embodiments, the bottom cover plate 500 may further include a groove 520. An assembly tool is inserted into the groove 520 to rotationally drive the first one-way valve 300 and the second one-way valve 400 to be connected together, facilitating the operation. The groove 520 may be a slotted groove, such as Figure 6 as shown; the groove 520 may also be a cross groove, and so on.

[0054] Figure 1 Meanwhile, the battery cover plate 200 in some embodiments of the present application is shown. The above-mentioned integrated dual-channel valve 100 is fixed on the battery cover plate 200. The fixing method may be threaded connection, welding, gluing, interference fit, and so on.

[0055] In some embodiments, the battery cover plate 200 and the first substrate 330 are coupled together. For example, in Figure 5 , the battery cover plate 200 includes a stepped step for positioning, and the first substrate 330 abuts against the stepped step and then is firmly welded. Also for example, in Figure 7 , the battery cover plate 200 and the first substrate 330 are integrally designed, and so on.

[0056] In summary, after reading this detailed disclosure, those skilled in the art can understand that the foregoing detailed disclosure may be presented only by way of example and may not be restrictive. Although not explicitly stated herein, those skilled in the art can understand that the present application is intended to encompass various reasonable changes, improvements, and modifications to the embodiments. These changes, improvements, and modifications are intended to be proposed by this disclosure and are within the spirit and scope of the exemplary embodiments of this disclosure.

[0057] In addition, certain terms in the present application have been used to describe the embodiments of this disclosure. For example, "one embodiment", "an embodiment", and / or "some embodiments" mean that the specific features, structures, or characteristics described in connection with the embodiment may be included in at least one embodiment of this disclosure. Therefore, it should be emphasized and understood that two or more references to "an embodiment" or "one embodiment" or "alternative embodiments" in various parts of this specification do not necessarily all refer to the same embodiment. In addition, the specific features, structures, or characteristics may be appropriately combined in one or more embodiments of this disclosure.

[0058] It should be understood that in the foregoing description of the embodiments of the present disclosure, for the purpose of helping to understand a feature and for the purpose of simplifying the present disclosure, the present application sometimes combines various features in a single embodiment, drawing, or its description. Alternatively, the present application sometimes disperses various features in multiple embodiments of the present application. However, this does not mean that the combination of these features is necessary. Those skilled in the art may very well extract some of these features and understand them as separate embodiments when reading the present application. That is to say, the embodiments in the present application can also be understood as the integration of multiple secondary embodiments. And it is also valid when the content of each secondary embodiment is less than all the features of a single foregoing disclosed embodiment.

[0059] In some embodiments, numbers expressing the quantity or nature of certain features used to describe and claim certain embodiments of the present application should be understood to be modified in some cases by the terms "about", "approximate" or "substantially". For example, unless otherwise specified, "about", "approximate" or "substantially" may represent a variation of ±20% of the value it describes. Therefore, in some embodiments, the numerical parameters set forth in the written description and the appended claims are approximations, which may vary depending on the desired properties sought to be obtained by a particular embodiment. In some embodiments, the numerical parameters should be construed in accordance with the number of significant figures reported and by applying ordinary rounding techniques. Although some embodiments of the present application list broad ranges of numerical values and parameters as approximations, as precise values as possible are listed in the specific examples.

[0060] Each patent, patent application, published patent application, and other materials cited herein, such as articles, books, specifications, publications, documents, items, etc., may be incorporated herein by reference. The entire content for all purposes, except for any prosecution file history associated therewith, any identical ones that may be inconsistent or conflict with this document, or any identical prosecution file history that may have a limiting effect on the broadest scope of the claims. Now or hereafter associated with this document. For example, if there is any inconsistency or conflict between the description, definition, and / or use of terms associated with any of the incorporated materials and the terms, descriptions, definitions, and / or in this document, the terms in this document shall prevail.

[0061] Finally, it should be understood that the embodiments of the application disclosed herein are illustrative of the principles of the embodiments of the present application. Other modified embodiments are also within the scope of the present application. Therefore, the embodiments disclosed in the present application are merely examples and not limitations. Those skilled in the art can adopt alternative configurations based on the embodiments in the present application to implement the application in the present application. Therefore, the embodiments of the present application are not limited to those embodiments precisely described in the application.

Claims

1. A battery cover plate, characterized in that, It includes an integrated dual-channel valve which is fixed on the battery cover plate and configured as the liquid injection hole of the lithium battery. The integrated dual-channel valve includes: a first one-way valve including a first channel configured to allow a first fluid to pass through in a first direction; a second one-way valve including a second channel configured to allow a second fluid to pass through in a second direction, wherein the first one-way valve and the second one-way valve are integrally designed, the first one-way valve and the second one-way valve are sleeved together, and the first one-way valve is sleeved outside the second one-way valve; the integrated dual-channel valve further includes a bottom cover plate configured to connect the first one-way valve and the second one-way valve. The second one-way valve and the first one-way valve are coaxially distributed. The first one-way valve includes: a first valve core including a first coupling surface and a second coupling surface; a first substrate including a third coupling surface and a fourth coupling surface; a first elastic member, wherein the first coupling surface and the third coupling surface are coupled, the first end of the first elastic member abuts against the second coupling surface, the second end of the first elastic member abuts against the fourth coupling surface to generate a first elastic force; the first substrate includes a through hole through which the first valve core passes. The second one-way valve includes: a second valve core including a fifth coupling surface and a sixth coupling surface; a second substrate including a seventh coupling surface and an eighth coupling surface; a second elastic member, wherein the fifth coupling surface and the seventh coupling surface are coupled, the first end of the second elastic member abuts against the sixth coupling surface, the second end of the second elastic member abuts against the eighth coupling surface, and the second elastic member generates a second elastic force; the second substrate is an integral formed by connecting the bottom cover plate and the first valve core. The battery cover plate and the first substrate are coupled together, and the first substrate is a stepped platform on the battery cover plate for positioning and / or supporting; the first valve core and the bottom cover plate are fixedly connected to form the second substrate; the first fluid is air, and the second fluid is electrolyte. Along the first direction, a first external force is applied to the first valve core. When the first external force is greater than the first elastic force, the first valve core moves along the first direction, the first coupling surface and the third coupling surface are decoupled, and the first channel is opened. When the first external force is less than or equal to the first elastic force, the first valve core presses against the first substrate, the first coupling surface and the third coupling surface are coupled, and the first channel is closed. Along the second direction, a second external force is applied to the second valve core. When the second external force is greater than the second elastic force and the second external force is less than or equal to the first elastic force, the second valve core moves along the second direction, the fifth coupling surface and the seventh coupling surface are decoupled, and the second channel is opened. When the second external force is less than or equal to the second elastic force, the second valve core presses against the second substrate, the fifth coupling surface and the seventh coupling surface are coupled, and the second channel is closed; the second direction is the same as the first direction. The stiffness of the first elastic member is greater than that of the second elastic member.

2. The battery cover plate according to claim 1, wherein, The first valve core is at least one of a frustum of a cone and a stepped cylinder.

3. The battery cover plate according to claim 1, wherein The second valve core is at least one of a frustum of a cone and a stepped cylinder.

4. The battery cover plate according to any one of claims 1-3, wherein The first one-way valve further includes a first seal, and the second one-way valve further includes a second seal.

5. The battery cover plate according to claim 1, wherein, It further includes a bottom cover plate configured to connect the first one-way valve and the second one-way valve.

6. The battery cover plate according to claim 5, wherein, The bottom cover plate includes at least one through hole, and when the second fluid passes through the second channel, it passes through the through hole.

7. The battery cover plate according to claim 5, wherein The bottom cover plate further includes a groove, and an assembly tool is inserted into the groove to rotationally drive the first one-way valve and the second one-way valve to be connected together.

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