One-way valve, connecting pipe and pressure release valve

Abstract

According to the one-way valve, the connecting pipe and the pressure release valve provided by the invention, the one-way valve not only can reliably seal the large-capacity battery when the large-capacity battery works normally, but also can be connected with the connecting pipe after the large-capacity battery is used for a period of time, so that a liquid supplementing and replacing device can conveniently carry out corresponding liquid supplementing and replacing operation. The one-way valve comprises a fixing sleeve, a sealing sleeve and a sealing assembly. A spring limiting plate is arranged at one end of an inner cavity of the sealing sleeve, and a positioning plate is arranged at the other end of the inner cavity of the sealing sleeve; the sealing assembly comprises a sealing plate, a sealing column and a compression spring, the sealing column is arranged in the sealing sleeve, a spring baffle is arranged on the sealing column, the compression spring is arranged on the sealing column in a sleeving mode and located between the spring limiting plate and the spring baffle, and the sealing plate is arranged at the end, penetrating through the spring limiting plate, of the sealing column. The sealing plate can seal the port of the sealing sleeve under the action of the compression spring; the sealing column penetrates through one end of the positioning plate and extends out of the sealing sleeve.

Description

Technical Field

[0001] The present invention belongs to the field of batteries, and in particular relates to a one-way valve, a connecting pipe and a pressure relief valve. Background Art

[0002] With the further development of lithium-ion batteries in recent years, their application scenarios have become increasingly extensive, especially in scenarios that require relatively high battery capacity. For example, they are used in automotive power batteries, energy storage batteries for household solar-storage systems, and batteries for energy storage systems in power plants.

[0003] In the above usage scenarios, in order to meet the larger capacity requirements, the existing practice is to connect multiple single cells together in series and parallel to form a large-capacity battery. However, due to the differences between the single cells in the above-mentioned large-capacity battery, the uniformity of the single cells in the large-capacity battery is poor, which will directly lead to the capacity and cycle life of the large-capacity battery being limited. To solve this problem, the existing large-capacity battery connects the electrolyte area and gas area of ​​each single cell through a shared chamber, so that each single cell is in a unified shared electrolyte and gas system, which to a certain extent reduces the differences between the single cells and improves the cycle life of the large-capacity battery. However, after a period of charge and discharge, the electrolyte in each single cell of the large-capacity battery can no longer meet the requirements, for example, lithium ion consumption, etc., resulting in a decline in performance and a reduction in cycle life of the large-capacity battery.

[0004] Currently, during the use of large-capacity batteries, electrolytes inside large-capacity batteries can be replaced and replenished through a fluid replacement device, thereby extending the cycle life of large-capacity batteries. When connecting existing fluid replacement devices to large-capacity batteries, there is an urgent need for a connection structure that is convenient for connection during fluid replacement and provides a good seal after the replacement is completed. Summary of the Invention

[0005] The present invention provides a one-way valve, a connecting pipe and a pressure relief valve. The one-way valve can not only reliably seal a large-capacity battery when the large-capacity battery is working normally, but can also be connected to the connecting pipe after the large-capacity battery has been used for a period of time, so as to facilitate the corresponding liquid replenishment operation of a liquid replenishment device.

[0006] In order to solve the above problems, the technical solution of the present invention is:

[0007] The present invention provides a one-way valve, which includes a fixing sleeve, a sealing sleeve and a sealing assembly; the fixing sleeve is used to be installed on the opening of a large-capacity battery; the sealing sleeve is installed in the fixing sleeve, and a spring limiting plate is provided at one end of the inner cavity of the sealing sleeve, and a positioning plate is provided at the other end, and the spring limiting plate and the positioning plate are both hollow plates; the sealing assembly includes a sealing plate, a sealing column and a compression spring, the sealing column is arranged in the sealing sleeve, and its two ends respectively pass through the spring limiting plate and the positioning plate, a spring baffle is provided on the sealing column, the compression spring is sleeved on the sealing column, and is located between the spring limiting plate and the spring baffle, the sealing plate is arranged at one end of the sealing column passing through the spring limiting plate, and the sealing plate can seal the port of the sealing sleeve under the action of the compression spring; the sealing column passes through one end of the positioning plate and extends to the outside of the sealing sleeve.

[0008] Furthermore, a first step hole is provided on the inner wall of the fixing sleeve, and an annular boss is provided on the outer wall of the sealing sleeve. The annular boss of the sealing sleeve is matched with the step surface of the first step hole for positioning.

[0009] Furthermore, a conical pipe thread is provided on the outer wall of the fixing sleeve.

[0010] Furthermore, an annular sealing notch is provided on the end surface of the fixing sleeve and the large-capacity battery connection end, and the fixing sleeve is embedded and connected with the opening on the large-capacity battery through the annular sealing notch to achieve double sealing at the connection.

[0011] The present invention also provides a connecting pipe for connecting with the above-mentioned one-way valve. The connecting pipe includes a connecting assembly, and the connecting assembly includes a first pipe section; the two ends of the first pipe section are respectively used to connect with the fixed sleeve of the one-way valve and the pipeline of the fluid replenishing and exchanging device.

[0012] Furthermore, it also includes a pushing assembly, which includes a second pipe section and a pushing plate. The second pipe section is arranged in the first pipe section and is located at one end of the first pipe section close to the one-way valve. The pushing plate is a hollow plate, which is fixed in the second pipe section and is used to push the sealing column and open the one-way valve when the first pipe section is connected to the one-way valve.

[0013] Furthermore, the first pipe segment has a second stepped hole, and the outer wall of the second pipe segment is provided with an annular protrusion. The stepped surface of the second stepped hole can axially position the annular protrusion of the second pipe segment, so that the first pipe segment drives the second pipe segment to move axially, press the sealing column, and open the one-way valve.

[0014] Furthermore, the inner wall of the first pipe section has a conical pipe thread, and the threaded connection with the fixing sleeve is coated with thread sealant; at the same time, a sealing ring groove is provided on the outer wall of the second pipe section, and a second sealing ring is installed in the sealing ring groove.

[0015] The present invention also provides a pressure relief valve for connecting with the above-mentioned one-way valve, the pressure relief valve including an opening component and a pressure relief component; the pressure relief component including an outer pipe section and a pressure relief membrane arranged in the outer pipe section; the outer pipe section is used to be connected to the fixed sleeve; the opening component includes an inner pipe section and a top pressure plate, the inner pipe section is nested in the outer pipe section, and is located at the end of the outer pipe section away from the pressure relief membrane, the top pressure plate is a hollow plate, which is fixed in the inner pipe section, and is used to press the sealing column when the pressure relief valve is connected to the one-way valve, to open the one-way valve, so that the inner cavity of the pressure relief valve is connected to the inner cavity of the electrolyte shared chamber.

[0016] Furthermore, the outer pipe section and the fixing sleeve are connected via a tapered pipe thread, and thread sealant is coated between the connecting threads.

[0017] Furthermore, a first sealing ring is provided between the outer wall of the inner pipe section and the inner wall of the fixing sleeve.

[0018] Furthermore, an annular clamping platform is provided on the inner wall of the outer tube section, and an annular step is provided on the outer wall of the inner tube section. The annular clamping platform of the outer tube section axially positions the annular step of the inner tube section so that the outer tube section drives the inner tube section to move axially.

[0019] Compared with the prior art, the technical solution of the present invention has the following advantages:

[0020] 1. The present invention provides a one-way valve. After the one-way valve is installed on a large-capacity battery, it can only be opened by an external gas, liquid or external force with a certain pressure, which can ensure the reliable sealing of the large-capacity battery during normal operation. At the same time, the one-way valve can complete the initial injection of the large-capacity battery. It can also be directly connected to the external fluid replenishment device through a connecting pipe when the large-capacity battery is replenished and replaced after a period of use, without the need for corresponding disassembly or replacement operations, making the replenishment and replacement operations of the large-capacity battery more convenient. In addition, the one-way valve of this structure can automatically and timely seal the opening on the large-capacity battery after the injection, replenishment and replacement are completed, ensuring that the electrolyte in the large-capacity battery is not affected by external air.

[0021] 2. In the one-way valve of the present invention, a first stepped hole is provided on the inner wall of the fixed sleeve, and an annular boss is provided on the outer wall of the sealing sleeve. The annular boss of the sealing sleeve is embedded in the first stepped hole of the fixed sleeve. This structure can ensure a reliable connection between the sealing sleeve and the fixed sleeve when the external gas or liquid pressure is too high, and prevent the external gas or liquid pressure from pushing the sealing sleeve away from the fixed sleeve.

[0022] 3. In the one-way valve of the present invention, a conical pipe thread for connecting to the connecting pipe is provided on the outer wall of the fixed sleeve. The conical pipe thread has more reliable sealing than conventional threads and can improve the sealing reliability of the connection between the one-way valve and the connecting pipe.

[0023] 4. In the one-way valve of the present invention, an annular sealing notch is provided on the end surface of the connection end between the fixing sleeve and the large-capacity battery. The annular sealing notch of the fixing sleeve is embedded and connected with the opening on the large-capacity battery. At this time, the horizontal plane of the annular sealing notch and the opening on the large-capacity battery form a sealing surface, and the vertical plane of the annular sealing notch and the opening on the large-capacity battery form a sealing surface, thereby achieving double sealing at the connection between the fixing sleeve and the large-capacity battery, and improving the reliability of the connection between the one-way valve and the large-capacity battery.

[0024] 5. The present invention also provides a connecting pipe that cooperates with the above-mentioned one-way valve. When a large-capacity battery is replenishing or replacing fluid, the connecting pipe reliably and tightly connects the pipeline of the fluid replenishing device with the above-mentioned one-way valve. At the same time, the connecting pipe can also open the one-way valve during connection to perform corresponding exhaust or liquid discharge operations.

[0025] 6. In the connecting pipe of the present invention, a second stepped hole is formed within the first pipe segment, and an annular projection is provided on the outer wall of the second pipe segment. The stepped surface of the second stepped hole axially positions the annular projection of the second pipe segment, allowing the first pipe segment to drive the second pipe segment to move axially, thereby opening the one-way valve. This structural form allows the second and first pipe segments to be machined and assembled separately, making overall manufacturing simple and cost-effective.

[0026] 7. In the connecting pipe of the present invention, the inner wall of the first pipe section has a conical pipe thread, which is more reliable in sealing than conventional threads; at the same time, the above-mentioned threaded connection has a thread sealant, which is more reliable in sealing than raw tape and gaskets, and can improve the sealing reliability of the connection between the connecting pipe and the one-way valve.

[0027] 8. In the connecting pipe of the present invention, a sealing ring groove is provided on the outer wall of the second pipe section, and a second sealing ring is installed in the sealing ring groove. The second sealing ring realizes the first seal between the second pipe section and the one-way valve. At the same time, the threaded seal between the second pipe section and the one-way valve realizes the second seal. The two seals further ensure the sealing of the connection between the connecting pipe and the one-way valve.

[0028] 9. The present invention also provides a pressure relief valve that cooperates with the aforementioned one-way valve. When the large-capacity battery is operating normally, the pressure relief valve and the one-way valve ensure a secure seal within the large-capacity battery. The pressure relief valve also promptly discharges thermal runaway fumes when any single cell in the large-capacity battery experiences thermal runaway, thereby enhancing the safety of the large-capacity battery. Installing the pressure relief valve on the one-way valve also enables integrated installation, reducing the number of openings on the large-capacity battery and improving its reliability during use.

[0029] 10. In the pressure relief valve of the present invention, the one-way valve and the pressure relief valve are connected by a tapered pipe thread, which has more reliable sealing than conventional threads. At the same time, the threaded connection has a thread sealant, which has better sealing reliability than raw tape and gaskets, and can improve the sealing reliability of the connection between the one-way valve and the pressure relief valve.

[0030] 11. In the pressure relief valve of the present invention, a first sealing ring is provided between the outer wall of the inner pipe section of the pressure relief valve and the inner wall of the fixed sleeve. The first sealing ring realizes the first sealing between the pressure relief valve and the one-way valve. At the same time, the threaded seal between the outer pipe section of the pressure relief valve and the one-way valve realizes the second sealing. The two seals further ensure the sealing of the connection between the pressure relief valve and the one-way valve.

[0031] 12. In the pressure relief valve of the present invention, an annular clamping platform is provided on the inner wall of the outer pipe section, and an annular step is provided on the outer wall of the inner pipe section. The annular clamping platform of the outer pipe section axially positions the annular step of the inner pipe section so that the outer pipe section drives the inner pipe section to move axially. This allows the outer pipe section and the inner pipe section to be processed and assembled separately, and the overall processing and manufacturing is relatively simple and the cost is low.

[0032] Other advantages, objectives and features of the present invention will be reflected in part from the following description and will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 It is a structural diagram of an existing large-capacity battery;

[0035] Figure 2 This is a schematic diagram of the structure of a one-way valve installed in a large-capacity battery in an embodiment;

[0036] Figure 3 Schematic diagram of the structure of the one-way valve in the embodiment;

[0037] Figure 4 Schematic diagram of the discharge of a large-capacity battery when replenishing the liquid in the embodiment;

[0038] Figure 5 Schematic diagram of the injection of liquid when replenishing the liquid of a large-capacity battery in the embodiment;

[0039] Figure 6A cross-sectional view of the first one-way valve, the second one-way valve, the first connecting pipe, and the second connecting pipe in the embodiment;

[0040] Figure 7 for Figure 6 A partial enlarged schematic diagram;

[0041] Figure 8 An exploded view of a large-capacity battery with a plug cap and a pressure relief valve in an embodiment;

[0042] Figure 9 It is a cross-sectional view of the first one-way valve, the second one-way valve, the plugging cap and the pressure relief valve in the embodiment;

[0043] Figure 10 for Figure 9 A partial enlargement of Figure 1 ;

[0044] Figure 11 for Figure 9 A partial enlargement of Figure 2 .

[0045] Figure numerals: 1-outer shell, 2-single cell, 3-first one-way valve, 4-second one-way valve, 5-blocking cap, 6-pressure relief valve, 7-first connecting pipe, 8-second connecting pipe, 9-fluid replenishing device, 11-first opening, 12-second opening, 31-fixing sleeve, 32-sealing sleeve, 33-sealing plate, 34-sealing column, 35-spring limiting plate, 36-positioning plate, 37-spring baffle, 38-compression spring, 311-first step hole, 312-annular sealing notch, 321-annular Boss, 61-inner pipe section, 62-top pressure plate, 63-outer pipe section, 64-pressure relief membrane, 65-first sealing ring, 611-annular step, 631-annular clamping platform, 81-second pipe section, 82-push plate, 83-first pipe section, 84-second sealing ring, 811-annular protrusion, 831-second step hole, 91-inert gas source, 92-gas pipeline, 93-gas collecting device, 94-electrolyte storage device, 95-electrolyte collecting device, 96-liquid pipeline, 97-stop valve. DETAILED DESCRIPTION

[0046] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the following detailed description of the specific embodiments of the present invention is given in conjunction with the accompanying drawings. It is obvious that the described embodiments are only part of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in this field without creative work should fall within the scope of protection of the present invention.

[0047] The phrases "in other embodiments" appearing in various places in this specification do not necessarily refer to the same embodiment, nor do they refer to separate or selective embodiments that are mutually exclusive with other embodiments. In this specification, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features being described. In the description of the present invention, "multiple" means two or more, unless otherwise specifically defined.

[0048] In this specification, unless otherwise specified or limited, the term "connection" should be understood in a broad sense. For example, it can mean a fixed connection, a detachable connection, or an integral connection; it can mean a direct connection, an indirect connection through an intermediate component, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0049] At the same time, in the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "top, bottom, inside and outside" are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0050] Existing large-capacity batteries consist of multiple sequentially arranged cells. The electrolyte and gas zones of each cell are connected via a shared chamber, allowing each cell to operate under a unified, shared electrolyte and gas system. This reduces variations between cells and improves the cycle life of the large-capacity battery. This shared chamber can be formed using hollow components or an outer shell to create large-capacity batteries with varying structural forms. The following lists examples of large-capacity batteries with varying structural forms.

[0051] 1. When formed by a hollow component, the specific structure of a large-capacity battery is as follows:

[0052] Large-capacity batteries include a battery pack body and a hollow component. The battery pack body includes a plurality of single cells arranged in sequence. The number of single cells can be adjusted according to the actual capacity requirements, and each single cell is connected in parallel through an electrical connector. The single cell can be a square shell battery, which includes an upper cover plate, a lower cover plate, a cylinder, an electrode assembly and an electrolyte; the upper cover plate, the lower cover plate and the cylinder constitute the battery shell, and the upper cover plate is provided with a polarity terminal for drawing out the current of the single cell. The above-mentioned hollow component is a split structure, mainly consisting of a hollow box with an open end and a cover plate for covering the open end;

[0053] The number of hollow members is determined based on demand. When there is only one hollow member, it is fixedly connected to the side wall of the battery pack body, allowing the electrolyte and gas areas of each cell to communicate with each other. The detailed structure of this hollow member is detailed in Chinese Patent CN117477063A. When there are multiple hollow members, one of them is fixedly connected to the upper cover of the cell, allowing the gas areas of each cell to communicate with each other. The inner cavity of this hollow member serves as a shared gas chamber. Another hollow member is connected to the lower cover of the cell, allowing the electrolyte areas of each cell to communicate with each other. The inner cavity of this hollow member serves as a shared electrolyte chamber. The detailed structure of this hollow member is detailed in Chinese Patent CN219892382U.

[0054] 2. When the shared chamber is formed by the outer shell, the specific structure of the large-capacity battery is as follows:

[0055] like Figure 1 As shown, the large-capacity battery includes an outer shell 1 and multiple single cells 2; the number of single cells can be adjusted according to actual capacity requirements, and the single cell can be a square shell battery, which includes an upper cover plate, a lower cover plate, a cylinder, an electrode assembly and an electrolyte; the upper cover plate, the lower cover plate and the cylinder constitute the battery shell, and the upper cover plate is provided with polarity terminals for leading out the current of the single cell.

[0056] Multiple single cells are placed side by side in an outer shell, which has shared chambers at the top and bottom. The top shared chamber is a gas shared chamber, and the bottom shared chamber is an electrolyte shared chamber, allowing the gas and electrolyte areas of each cell to communicate with each other. Through holes are opened at the top of the outer shell at the positions corresponding to the polarity terminals of each cell; the polarity terminals of each cell pass through the through holes to connect the cells in parallel. The specific structure of the outer shell of the above-mentioned large-capacity battery is as follows:

[0057] 1) The outer shell includes an outer cylinder, an upper cover, and a lower cover. The top and bottom of the outer cylinder are open. The upper cover is sealed and fixed (welded) to the top of the outer cylinder. The upper cover has through holes that allow the polarity terminals of each single cell to extend. The lower cover is sealed and fixed (welded) to the bottom of the outer cylinder. At the same time, the upper cover is provided with a gas sharing chamber, and the lower cover is provided with an electrolyte sharing chamber.

[0058] 2) The outer shell includes a U-shaped shell, a first cover plate, a third cover plate, and a second cover plate; the first cover plate and the third cover plate respectively cover the two opposite open ends of the U-shaped shell; the second cover plate covers the top open end of the U-shaped shell and is sealed to the open end, and the second cover plate has through holes that allow the polarity terminals of each single cell to extend out. At the same time, the second cover plate is provided with a gas sharing chamber, and the bottom of the U-shaped shell is provided with an electrolyte sharing chamber;

[0059] 3) The outer shell includes an outer cylinder, a front side plate, and a rear side plate; the front and rear of the outer cylinder are open, the front side plate is sealed and fixed (welded) to the front of the outer cylinder, and the rear side plate is sealed and fixed (welded) to the rear of the outer cylinder. The top of the outer cylinder is provided with a through hole that allows the polarity terminals of each single cell to extend out. The top of the outer cylinder is provided with a gas sharing chamber, and the bottom is provided with an electrolyte sharing chamber.

[0060] Regardless of the aforementioned large-capacity battery structure, after a period of charge-discharge cycling, the electrolyte decomposes and consumes, reducing the electrolyte content within the large-capacity battery to meet requirements, leading to performance degradation. Alternatively, after a period of charge-discharge cycling, impurities in the electrolyte can affect the performance of the lithium-ion battery, resulting in a decrease in performance and cycle life. In this case, the large-capacity battery can be replenished or replaced to improve its performance.

[0061] Based on this, the present invention provides a one-way valve and connecting tube. The one-way valve is installed on the opening of the large-capacity battery. When the large-capacity battery is operating normally, the one-way valve can reliably seal the opening of the large-capacity battery. When replenishing or replacing the fluid of the large-capacity battery, it is only necessary to connect the one-way valve to the fluid replacement device through the connecting tube to perform the corresponding fluid replacement operation, which is simple to operate. It should be noted here that the one-way valve and connecting tube can also be used for fluid replacement operations of batteries with other structural forms. For example, it can be used to replenish or replace the fluid of a single square shell battery.

[0062] like Figure 2 As shown, a conventional large-capacity battery includes a gas-sharing chamber and an electrolyte-sharing chamber. The gas-sharing chamber is provided with a first opening 11 in communication therewith, and the electrolyte-sharing chamber is provided with a second opening 12 in communication therewith. The first opening is used for air intake or exhaust, and the second opening 12 is used for liquid intake or discharge. Both the first opening 11 and the second opening 12 are provided with a one-way valve for fluid replenishment and replacement. For ease of distinction and description, the one-way valve on the first opening 11 is the first one-way valve 3, and the one-way valve on the second opening 12 is the second one-way valve 4.

[0063] In this embodiment, the first one-way valve 3 and the second one-way valve 4 have the same structure, and the specific structure is as follows:

[0064] like Figure 3 As shown, the first one-way valve 3 includes a fixing sleeve 31, a sealing sleeve 32, and a sealing assembly. The fixing sleeve 31 is fixedly mounted on the first opening 11 and is sealed therewith. The sealing sleeve 32 is installed within the fixing sleeve 31 and cooperates with the sealing assembly to seal the first opening 11. When the sealing sleeve 32 is connected to the sealing assembly, a spring retaining plate 35 is provided at one end of the inner cavity of the sealing sleeve 32, and a positioning plate 36 is provided at the other end. Both the spring retaining plate 35 and the positioning plate 36 are hollow plate structures.

[0065] The above-mentioned sealing assembly includes a sealing plate 33, a sealing column 34 and a compression spring 38. The sealing column 34 is arranged in the sealing sleeve 32, and its two ends respectively pass through the spring limit plate 35 and the positioning plate 36. A spring baffle 37 is provided on the sealing column 34, and the compression spring 38 is sleeved on the sealing column 34 and is located between the spring limit plate 35 and the spring baffle 37. The sealing plate 33 is sleeved on one end of the sealing column 34 passing through the spring limit plate 35, and the sealing plate 33 can seal the port of the sealing sleeve 32 under the action of the compression spring 38; the sealing column 34 passes through one end of the positioning plate 36 and extends to the outside of the sealing sleeve 32. Under the action of external force, the sealing column 34 overcomes the force of the compression spring 38 and drives the sealing plate 33 to move toward the inner cavity of the large-capacity battery to keep the sealing plate 33 away from the sealing sleeve 32. At this time, the inner cavity of the large-capacity battery is connected to the outside, and the first one-way valve 3 is opened.

[0066] It should be noted that the size of the above-mentioned spring baffle 37 needs to be smaller than the size of the inner cavity of the sealing sleeve 32, or the spring baffle 37 is a hollow plate. At the same time, the above-mentioned spring limit plate 35 and positioning plate 36 are both hollow plates. When the sealing plate 33 is away from the sealing sleeve 32, gas or liquid can pass through the first one-way valve 3.

[0067] like Figure 3 As shown, a first step hole 311 is provided on the inner wall of the fixing sleeve 31 of this embodiment, and an annular boss 321 is provided on the outer wall of the sealing sleeve 32. The annular boss of the sealing sleeve cooperates with the step surface of the first step hole to position the sealing sleeve. This structure can ensure a reliable connection between the sealing sleeve 32 and the fixing sleeve 31 when the external gas or liquid pressure is too high, and prevent the external gas or liquid pressure from pushing the sealing sleeve 32 away from the fixing sleeve 31 due to excessive pressure.

[0068] like Figure 3 As shown, an annular sealing notch 312 is further provided on the end surface of the connection end between the fixing sleeve 31 and the large-capacity battery in this embodiment. The annular sealing notch 312 of the fixing sleeve 31 is embedded and matched with the first opening 11 on the large-capacity battery. At this time, the transverse plane of the annular sealing notch 312 forms a sealing surface with the first opening 11 on the large-capacity battery, and the vertical plane of the annular sealing notch 312 forms a sealing surface with the first opening 11 on the large-capacity battery, thereby achieving double sealing between the fixing sleeve 31 and the first opening 11 of the large-capacity battery, thereby improving the reliability of the connection between the first one-way valve 3 and the large-capacity battery.

[0069] The first one-way valve 3 is mainly used for air intake and exhaust during fluid replenishment and replacement, and its working principle is as follows:

[0070] like Figure 3As shown, when the large-capacity battery is working normally, under the action of the compression spring 38, the spring baffle 37 is pushed toward the outside of the large-capacity battery by the spring force. At this time, the sealing column 34 drives the sealing plate 33 to move toward the outside of the large-capacity battery at the same time. The sealing plate 33 blocks the port of the sealing sleeve 32, and the first one-way valve 3 is closed to achieve sealing.

[0071] When the large-capacity battery needs to be drained, the first one-way valve 3 needs to perform the corresponding air intake operation. At this time, when the external gas with a certain pressure (the gas pressure is greater than the gas pressure in the inner cavity of the large-capacity battery) passes through the sealing sleeve 32, the gas acts on the sealing plate 33, and the sealing plate 33 moves toward the inner cavity of the large-capacity battery. The sealing plate 33 moves away from the sealing sleeve 32, and the first one-way valve 3 opens to perform the corresponding air intake operation.

[0072] When the large-capacity battery needs to be injected with liquid, the first one-way valve 3 needs to perform the corresponding exhaust operation. At this time, the first one-way valve 3 is opened under the external force. The external force acts on the sealing column 34. The sealing column 34 overcomes the force of the compression spring 38 and drives the sealing plate 33 to move toward the inner cavity of the large-capacity battery. The sealing plate 33 moves away from the sealing sleeve 32, and the first one-way valve 3 is opened to perform the corresponding exhaust operation.

[0073] The second one-way valve 4 is mainly used for liquid inlet and outlet when replenishing or replacing liquid. Its working principle is as follows:

[0074] like Figure 3 As shown, in this embodiment, the structure of the second one-way valve 4 is the same as that of the first one-way valve 3. When the large-capacity battery is working normally, the second one-way valve 4 seals the second opening 12.

[0075] When the large-capacity battery needs to be drained, the second one-way valve 4 is opened by an external force, and the external force acts on the sealing column 34. The sealing column 34 overcomes the force of the compression spring 38 and drives the sealing plate 33 to move toward the inner cavity of the large-capacity battery. The sealing plate 33 moves away from the sealing sleeve 32. At this time, the inner cavity of the large-capacity battery is connected to the outside, the second one-way valve 4 is opened, and the corresponding drainage operation is performed.

[0076] When the large-capacity battery needs to be replenished after draining, when the external liquid with a certain pressure (the liquid pressure is greater than the liquid pressure in the inner cavity of the large-capacity battery) passes through the sealing sleeve 32, the liquid acts on the sealing plate 33, and the sealing plate 33 moves toward the inner cavity of the large-capacity battery. The sealing plate 33 moves away from the sealing sleeve 32. At this time, the inner cavity of the large-capacity battery is connected to the outside, the second one-way valve 4 is opened, and the corresponding liquid replenishing operation is performed.

[0077] As can be seen from the above structure, when the first one-way valve 3 and the second one-way valve 4 are opened, they can only be opened by external gas or liquid with a certain pressure (the pressure of the gas or liquid is greater than the pressure of the gas or liquid in the large-capacity battery cavity) or external force. Therefore, it can achieve reliable sealing of the first opening 11 and the second opening 12 when the large-capacity battery is operating normally, meeting the reliability of the sealing of the large-capacity battery during long-term use. When the large-capacity battery is replenished or replaced, the replenishment and replacement device is connected to the first one-way valve 3 and the second one-way valve 4 respectively through the connecting pipe to complete the corresponding replenishment and replacement operations, which is simple to operate. At the same time, after the fluid replenishment is completed, the first one-way valve 3 and the second one-way valve 4 are directly disassembled and separated from the fluid replenishment device. At this time, under the action of the compression spring 38, the spring baffle 37 is pushed toward the outside of the large-capacity battery by the spring force. At this time, the sealing column 34 drives the sealing plate 33 to move toward the outside of the large-capacity battery at the same time. The sealing plate 33 blocks the port of the sealing sleeve 32. The first one-way valve 3 and the second one-way valve 4 can automatically complete the sealing of the first opening 11 and the second opening 12.

[0078] like Figures 4 to 7 As shown, after the large-capacity battery has been working for a period of time, it needs to be connected to an external fluid replenishment device 9 to perform fluid replenishment or fluid replacement operations. When the large-capacity battery is replenishing or replacing fluid, different connectors need to be connected to the first one-way valve 3 and the second one-way valve 4. When liquid or air needs to be discharged, the connector needs to actively open the corresponding first one-way valve 3 or second one-way valve 4. When liquid or air needs to be fed in, the first one-way valve 3 and the second one-way valve 4 are opened by liquid or gas pressure. Therefore, this embodiment provides two connector structures, one of which is a first connecting pipe, which does not require the one-way valve to be actively opened, and the other connector is a second connecting pipe, which requires the one-way valve to be actively opened.

[0079] The second connecting pipe in this embodiment conveniently and reliably connects the pipeline (gas pipeline or liquid pipeline) of the fluid replenishing device 9 to the first one-way valve 3 or the second one-way valve 4 when replenishing the fluid of a large-capacity battery. At the same time, the second connecting pipe can also automatically open the one-way valve to perform corresponding exhaust or liquid discharge operations.

[0080] In this embodiment, the structure of the second connecting pipe 8 is as follows:

[0081] like Figure 6 and Figure 7As shown, the second connecting pipe 8 includes a pressing assembly and a connecting assembly; the pressing assembly includes a second pipe segment 81 and a pushing plate 82 disposed within the second pipe segment 81. The pushing plate 82 is a hollow plate fixed within the second pipe segment 81 and is used to open the second one-way valve 4 when the second connecting pipe 8 is connected to the second one-way valve 4. The connecting assembly includes a first pipe segment 83. The second pipe segment 81 is nested within the first pipe segment 83 and is located at one end of the first pipe segment 83 near the second one-way valve 4. The two ends of the first pipe segment 83 are respectively used to connect to the second one-way valve 4 and the pipeline of the fluid replenishment device 9.

[0082] When the second connecting pipe 8 is specifically connected to the second one-way valve 4, the first pipe section 83 can be connected to the second one-way valve 4 by an interference fit, and a sealant can be applied at the fitting point. Alternatively, the second one-way valve 4 can be provided with an external thread, and the inner wall of the first pipe section 83 can be provided with an internal thread, so that the second one-way valve 4 and the second connecting pipe 8 are connected by a thread. Preferably, the thread is a tapered pipe thread, which is more reliable than conventional threads in sealing. At the same time, the threaded connection is provided with a thread sealant, which is more reliable than raw tape and gaskets in sealing, and can improve the sealing reliability of the connection between the second one-way valve 4 and the second connecting pipe 8.

[0083] In addition, in order to further ensure the sealing between the second connecting pipe 8 and the second one-way valve 4, a sealing ring groove can be provided on the outer wall of the second pipe section 81, and a second sealing ring 84 is installed in the sealing ring groove. The second sealing ring 84 realizes the first sealing between the second pipe section 81 and the second one-way valve 4. At the same time, the threaded seal between the first pipe section 83 and the second one-way valve 4 realizes the second sealing.

[0084] like Figure 7 As shown, when the second connecting pipe 8 is connected to the second one-way valve 4, the first pipe section 83 moves axially toward the second one-way valve 4. At the same time, the second pipe section 81 and the first pipe section 83 move synchronously toward the second one-way valve 4, and the push plate 82 contacts the sealing column 34 of the second one-way valve 4. During the process of connecting the first pipe section 83 and the second one-way valve 4, the push plate 82 pushes the sealing column 34 of the second one-way valve 4 toward the large-capacity battery, so that the second one-way valve 4 is opened. At this time, the inner cavity of the second pipe section 81 is connected to the inner cavity of the large-capacity battery.

[0085] like Figure 7As shown, in this embodiment, the first pipe segment 83 has a second stepped hole 831 within it, and an annular protrusion 811 is provided on the outer wall of the second pipe segment 81. The stepped portion of the second stepped hole 831 faces the annular protrusion 811 of the second pipe segment 81 for axial positioning, so that the first pipe segment 83 drives the second pipe segment 81 to move axially, thereby opening the one-way valve. This allows the second pipe segment 81 and the first pipe segment 83 to be machined and assembled separately, making the overall manufacturing process simple and cost-effective. In other embodiments, the first pipe segment 83 and the second pipe segment 81 can also be a monolithic structure, but this structure is inconvenient to manufacture and has higher manufacturing costs.

[0086] In this embodiment, the first connecting tube 7 and the second connecting tube 8 have similar structures. Unlike the second connecting tube 8, the first connecting tube 7 does not include the aforementioned push-up assembly, and its specific structure will not be described in detail. In other embodiments, the first connecting tube 7 and the second connecting tube 8 have similar structures. Unlike the second connecting tube 8, the first connecting tube 7 does not include the push-up plate 82.

[0087] The first and second one-way valves 3 and 4 above are used to initially fill the large-capacity battery. After a period of use, the large-capacity battery can be refilled or replaced with a fluid replacement device 9 to improve its performance. The fluid replacement device 9 may include an inert gas source 91, a gas collection device 93, an electrolyte storage device 94, an electrolyte collection device 95, a gas pipeline 92, a liquid pipeline 96, and a shut-off valve 97.

[0088] Vacuuming steps

[0089] Before the initial liquid filling of the large-capacity battery, the second connecting pipe 8 is installed on the first one-way valve 3 or the second one-way valve 4. The second connecting pipe 8 actively opens the first one-way valve 3 or the second one-way valve 4, turns on the vacuum device, and performs a vacuum operation on the large-capacity battery;

[0090] Initial injection process

[0091] When the large-capacity battery is initially filled with liquid, the first connecting pipe 7 is installed on the second one-way valve 4, and the electrolyte storage device is connected to the first connecting pipe 7 through a liquid pipeline. At this time, a stop valve must also be installed on the liquid pipeline. Before the initial filling, open the stop valve and the electrolyte storage device. The electrolyte storage device fills the liquid pipeline, the first connecting pipe 7, and the second one-way valve 4 with electrolyte, and then closes the stop valve. Subsequently, the electrolyte with a certain pressure opens the second one-way valve 4, and the electrolyte enters the inner cavity of the large-capacity battery through the second one-way valve 4. After the filling is completed, the hydraulic pressure is removed, and the second one-way valve is closed, completing the initial filling operation of the large-capacity battery;

[0092] Formation exhaust process

[0093] After the initial liquid injection of the large-capacity battery is completed, the large-capacity battery is formed. The second connecting pipe 8 is installed on the first one-way valve 3. The second connecting pipe 8 opens the first one-way valve 3. During this formation process, the gas generated in the large-capacity battery is discharged outward through the first one-way valve 3, and the formation exhaust operation is completed.

[0094] Fluid rehydration process

[0095] After a period of charge and discharge cycles of a large-capacity battery, the capacity decays. For example, when the capacity decays to below 95%, the large-capacity battery is replenished regularly or irregularly.

[0096] like Figure 5 As shown, the second connecting pipe 8 is installed on the first one-way valve 3, the gas collection device 93 is connected to the second connecting pipe 8 via the gas pipeline 92, the first connecting pipe 7 is installed on the second one-way valve 4, and the electrolyte storage device 94 is connected to the first connecting pipe 7 via the liquid pipeline 96. In this case, a stop valve 97 is also required to be installed on the liquid pipeline 96. Before rehydration, the stop valve 97 is opened and the electrolyte storage device 94 is opened to fill the liquid pipeline 96, the first connecting pipe 7, and the second one-way valve 4 with electrolyte. Then, the stop valve 97 is closed. Subsequently, the second one-way valve 4 is opened by utilizing the hydraulic pressure of the electrolyte, and the electrolyte in the electrolyte storage device 94 enters the large-capacity battery through the second one-way valve 4. At the same time, the second connecting pipe 8 opens the first one-way valve 3, and under the action of the electrolyte, the gas in the large-capacity battery is discharged into the gas collecting device 93 through the first one-way valve 3. After the rehydration is completed, the hydraulic pressure and the second connecting pipe 8 are removed, and the first one-way valve 3 and the second one-way valve 4 are closed to complete the rehydration operation of the large-capacity battery.

[0097] The electrolyte is replenished in the above-mentioned rehydration process. In actual operation, additives, lithium replenishers and other solvents that improve the performance of large-capacity batteries can also be replenished.

[0098] Fluid exchange process

[0099] After a large-capacity battery has been charged and discharged for a period of time and its capacity has decayed, for example, when the capacity decays to below 90%, the large-capacity battery should be replaced regularly or irregularly. When replacing the large-capacity battery, the draining operation should be performed first, followed by the filling operation.

[0100] like Figure 4As shown, when draining a large-capacity battery, the first connecting pipe 7 is installed on the first one-way valve 3, the inert gas source 91 is connected to the first connecting pipe 7 through a gas line 92, the second connecting pipe 8 is installed on the second one-way valve 4, and the electrolyte collection device 95 is connected to the second connecting pipe 8 through a liquid line 96. At this time, a stop valve 97 can also be installed on the gas line 92. Before draining, the stop valve 97 is opened, and the inert gas source 91 is turned on. The inert gas in the inert gas source 91 purges the gas line 92, the first connecting pipe 7, and the first one-way valve 3, so that the air in the above-mentioned lines is discharged through the stop valve 97. After the purge is completed, the stop valve 97 is closed. Subsequently, the inert gas source 91 is pressurized to open the second one-way valve 4 by means of the gas pressure. The gas enters the inner cavity of the large-capacity battery through the second one-way valve 4. At the same time, the second connecting pipe 8 opens the second one-way valve 4. Under the action of the high-pressure inert gas, the electrolyte in the large-capacity battery is discharged from the second one-way valve 4 to the electrolyte collection device 95 until all the electrolyte in the large-capacity battery is completely discharged. After the discharge is completed, the gas pressure and the second connecting pipe 8 are removed, and the first one-way valve 3 and the second one-way valve 4 are closed.

[0101] like Figure 5 As shown, when filling a large-capacity battery, the first connecting pipe 7 and the second connecting pipe 8 are removed from the first one-way valve 3 and the second one-way valve 4, and then the second connecting pipe 8 is installed on the first one-way valve 3. The gas collection device 93 is connected to the second connecting pipe 8 through the gas pipeline 92, the first connecting pipe 7 is installed on the second one-way valve 4, and the electrolyte storage device 94 is connected to the first connecting pipe 7 through the liquid pipeline 96. At this time, a stop valve 97 can also be installed on the liquid pipeline 96. Before filling, the stop valve 97 is opened and the electrolyte storage device 94 is opened. The electrolyte storage device 94 is used to fill the liquid pipeline 96, the first connecting pipe 7 and the second one-way valve 4 with electrolyte. Then, the stop valve 97 is closed. The second one-way valve 4 is opened by the electrolyte hydraulic pressure, and the electrolyte in the electrolyte storage device 94 enters the large-capacity battery through the second one-way valve 4. At the same time, the second connecting pipe 8 is twisted, and the second connecting pipe 8 opens the first one-way valve 3. Under the action of the electrolyte, the gas in the large-capacity battery is discharged into the gas collection device 93 through the first one-way valve 3, completing the liquid replacement operation of the large-capacity battery.

[0102] As can be seen from the above process, after the first one-way valve 3 and the second one-way valve 4 are installed on the large-capacity battery, the initial liquid injection of the large-capacity battery can be completed. After the initial liquid injection, the first one-way valve 3 and the second one-way valve 4 can automatically close to ensure the sealing of the large-capacity battery during use. At the same time, the first one-way valve 3 and the second one-way valve 4 are equivalent to the repair interface set on the capacity battery. When the capacity of the large-capacity battery decays, the large-capacity battery can be repaired online (liquid injection, liquid replacement) through this repair interface to improve its capacity and cycle life.

[0103] When the performance of a large-capacity battery degrades after a period of charge and discharge cycling, the second one-way valve 4 can be used to refill the large-capacity battery with additives, lithium supplements, electrolyte, and other liquids to improve its performance. Simultaneously, the first one-way valve 3 is opened to discharge gas from the large-capacity battery. During this refilling process, injection and exhaust occur simultaneously. Due to the pressure differential, this not only improves refilling efficiency but also allows the injected liquid to fully soak into the electrode assemblies within each single cell 2, resulting in a more effective refill. Furthermore, the discharge of gas from the large-capacity battery prevents the impact of increased gas pressure on the battery's performance. Discharging the gas also reduces the probability of thermal runaway in the large-capacity battery due to excessive gas pressure.

[0104] When the performance of the large-capacity battery degrades after a period of charge and discharge cycles, the large-capacity battery can be drained and injected to replace the electrolyte. During drainage, the large-capacity battery can be aired in through the first one-way valve 3, while the second one-way valve 4 is used to drain the electrolyte. During the drainage process, the presence of gas pressure not only allows the original electrolyte in the large-capacity battery to be discharged as much as possible, but also improves the drainage efficiency. After the drainage is completed, the large-capacity battery is injected with electrolyte through the second one-way valve 4, while the first one-way valve 3 is opened to discharge the gas in the large-capacity battery. During this injection process, the injection and exhaust are carried out simultaneously. Due to the pressure difference, the injection efficiency is improved and the injected liquid can fully penetrate the electrode assembly in each single cell 2, thus achieving a better injection effect. In addition, the gas in the large-capacity battery is discharged, which can prevent the increase of gas pressure in the large-capacity battery from affecting its performance. After the gas is discharged, the probability of thermal runaway of the large-capacity battery caused by excessive gas pressure is reduced.

[0105] like Figure 8 and Figure 9 As shown, after the high-capacity battery is refilled and in normal operation, a plugging cap 5 can be installed on the first one-way valve 3 to ensure the sealing of the first opening 11. In this case, the first one-way valve 3 provides the first seal of the first opening 11, and the plugging cap 5 provides the second seal of the first opening 11. When the high-capacity battery is operating normally, the plugging cap 5 and the first one-way valve 3 provide a reliable seal for the first opening 11. When the high-capacity battery needs to be refilled again, the plugging cap 5 is removed from the first one-way valve 3 by external force, and the first one-way valve 3 is connected to the refilling device 9 via the second connecting pipe 8 to perform the corresponding refilling operation.

[0106] like Figure 10As shown, the plugging cap 5 of this embodiment is a circular sealing cover with one end open. When connected, the circular sealing cover can be connected with the first one-way valve 3 by interference fit, and a sealant is applied at the fitting point. Alternatively, an external thread is provided on the first one-way valve 3, and an internal thread is provided on the inner wall of the circular sealing cover. The first one-way valve 3 and the plugging cap 5 are connected by a thread to improve their sealing performance. Preferably, the above-mentioned thread is a conical pipe thread, which is more reliable than conventional thread sealing. At the same time, the above-mentioned threaded connection is provided with a thread sealant, which is more reliable than the sealing performance of raw tape and gaskets, and can improve the sealing reliability of the connection between the first one-way valve 3 and the plugging cap 5.

[0107] like Figure 8 and Figure 9 As shown, after the fluid injection is completed, a pressure relief valve 6 can also be installed on the above-mentioned second one-way valve 4. After the pressure relief valve 6 is connected to the second one-way valve 4, the second one-way valve 4 can be opened to connect the pressure relief channel of the pressure relief valve 6 with the shared chamber. When the large-capacity battery is working normally, the pressure relief valve 6 and the second one-way valve 4 achieve a good seal of the second opening 12. When any single cell 2 in the large-capacity battery has a thermal runaway, the pressure relief valve 6 opens and discharges the thermal runaway smoke from the second opening 12, thereby achieving an orderly discharge of the thermal runaway smoke and improving the safety of the large-capacity battery. At the same time, the pressure relief valve 6 is installed on the second one-way valve 4, so that the pressure relief valve 6 and the second one-way valve 4 are installed in an integrated manner, reducing the number of openings on the large-capacity battery and improving the reliability of the large-capacity battery during use.

[0108] like Figure 11 As shown, the pressure relief valve 6 in this embodiment includes an opening component and a pressure relief component; the pressure relief component includes an outer tube section 63 and a pressure relief membrane 64 disposed within the outer tube section 63; the two ends of the outer tube section 63 are respectively used to connect to the second one-way valve 4 and the flue gas pipeline. The pressure relief membrane 64 seals the second opening 12 when the large-capacity battery is operating normally. When any single cell 2 in the large-capacity battery experiences thermal runaway, it is ruptured by the high-pressure thermal runaway flue gas, thereby achieving the discharge of the thermal runaway flue gas. The opening component includes an inner tube section 61 and a top pressure plate 62 disposed within the inner tube section 61. The top pressure plate 62 is a hollow plate fixed within the inner tube section 61 and is used to open the second one-way valve 4 when the pressure relief valve 6 is connected to the second one-way valve 4. The inner pipe section 61 is nested in the outer pipe section 63 and is located at one end of the outer pipe section 63 close to the second one-way valve 4. When the outer pipe section 63 is connected to the second one-way valve 4, the inner pipe section 61 moves toward the direction of the second one-way valve 4, thereby driving the top pressure plate 62 to move and open the second one-way valve 4.

[0109] like Figure 11As shown, in this embodiment, an annular clamping platform 631 is provided on the inner wall of the outer tube section 63, and an annular step 611 is provided on the outer wall of the inner tube section 61. The annular clamping platform 631 of the outer tube section 63 axially positions the annular step 611 of the inner tube section 61, so that the outer tube section 63 drives the inner tube section 61 to move axially. This allows the outer tube section 63 and the inner tube section 61 to be processed and assembled separately, and the overall processing and manufacturing is relatively simple and the cost is low.

[0110] When the pressure relief valve 6 is specifically connected to the second one-way valve 4, the outer tube section 63 can be connected to the second one-way valve 4 through an interference fit. Alternatively, the second one-way valve 4 can be provided with external threads, and the inner wall of the outer tube section 63 can be provided with internal threads. The second one-way valve 4 and the pressure relief valve 6 are connected by threads, thereby improving their sealing performance. Preferably, the threads are tapered pipe threads, which are more reliable than conventional threads. At the same time, the threaded connection is provided with thread sealant, which is more reliable than raw tape and gaskets in sealing, and can improve the sealing reliability of the connection between the second one-way valve 4 and the pressure relief valve 6. At the same time, when the outer tube section 63 is connected to the flue gas pipeline, it can also be connected by interference fit or threaded connection. In this case, the end of the outer tube section 63 away from the second one-way valve 4 has external threads, and the flue gas pipeline has internal threads. In this case, the inner tube section 61 is located at the end of the outer tube section 63 with internal threads, and the pressure relief membrane 64 is provided at the end of the outer tube section 63 with external threads.

[0111] like Figure 11 As shown, when the pressure relief valve 6 is connected to the second one-way valve 4, the top pressure plate 62 contacts the sealing column 34 of the second one-way valve 4. During the process of connecting the pressure relief valve 6 to the second one-way valve 4, the top pressure plate 62 pushes the sealing column 34 of the second one-way valve 4 toward the large-capacity battery, so that the second one-way valve 4 is opened. At this time, the inner cavity of the inner tube section 61 is connected to the inner cavity of the large-capacity battery.

[0112] In addition, in order to further ensure the sealing between the pressure relief valve 6 and the second one-way valve 4, a sealing ring groove can be provided on the outer wall of the inner pipe section 61, and a second sealing ring 84 is installed in the sealing ring groove. The second sealing ring 84 realizes the first sealing between the inner pipe section 61 and the second one-way valve 4. At the same time, the threaded seal between the outer pipe section 63 and the second one-way valve 4 realizes the second sealing.

Claims

1. A one-way valve, characterized in that: It includes a fixing sleeve, a sealing sleeve and a sealing assembly; The fixing sleeve is used to be installed on the opening of the large-capacity battery; The sealing sleeve is installed in the fixed sleeve, and a spring limiting plate is provided at one end of the inner cavity of the sealing sleeve, and a positioning plate is provided at the other end, and the spring limiting plate and the positioning plate are both hollow plates; The sealing assembly includes a sealing plate, a sealing column and a compression spring. The sealing column is arranged in the sealing sleeve, and its two ends respectively pass through the spring limit plate and the positioning plate. A spring baffle is provided on the sealing column. The compression spring is sleeved on the sealing column and is located between the spring limit plate and the spring baffle. The sealing plate is arranged at one end of the sealing column passing through the spring limit plate. The sealing plate can seal the port of the sealing sleeve under the action of the compression spring; one end of the sealing column passes through the positioning plate and extends to the outside of the sealing sleeve.

2. The one-way valve according to claim 1, characterized in that: A first step hole is provided on the inner wall of the fixing sleeve, and an annular boss is provided on the outer wall of the sealing sleeve. The annular boss of the sealing sleeve is matched with the step surface of the first step hole for positioning.

3. The one-way valve according to claim 1, characterized in that The outer wall of the fixing sleeve is provided with a conical pipe thread.

4. The one-way valve according to claim 1, characterized in that An annular sealing notch is provided on the end surface of the fixing sleeve and the large-capacity battery connection end. The fixing sleeve is embedded and connected with the opening on the large-capacity battery through the annular sealing notch to achieve double sealing at the connection.

5. A connecting pipe for connecting to the one-way valve according to any one of claims 1 to 4, characterized in that: It comprises a connecting assembly, which comprises a first pipe section; the two ends of the first pipe section are respectively used to connect with the fixing sleeve of the one-way valve and the pipeline of the fluid replenishing and exchanging device.

6. The connecting pipe according to claim 5, characterized in that It also includes a pushing assembly, which includes a second pipe section and a pushing plate. The second pipe section is arranged in the first pipe section and is located at one end of the first pipe section close to the one-way valve. The pushing plate is a hollow plate, which is fixed in the second pipe section and is used to push the sealing column and open the one-way valve when the first pipe section is connected to the one-way valve.

7. The connecting pipe according to claim 6, characterized in that The first pipe segment has a second stepped hole in it, and an annular protrusion is provided on the outer wall of the second pipe segment. The stepped surface of the second stepped hole can axially position the annular protrusion of the second pipe segment, so that the first pipe segment drives the second pipe segment to move axially, press the sealing column, and open the one-way valve.

8. The connecting pipe according to claim 6, characterized in that The inner wall of the first pipe section has a conical pipe thread, and the threaded connection with the fixing sleeve is coated with thread sealant; at the same time, a sealing ring groove is provided on the outer wall of the second pipe section, and a second sealing ring is installed in the sealing ring groove.

9. A pressure relief valve, used to connect with the one-way valve according to any one of claims 1 to 4, characterized in that: The pressure relief valve includes an opening component and a pressure relief component; The pressure relief assembly includes an outer pipe section and a pressure relief membrane arranged in the outer pipe section; the outer pipe section is used to connect with the fixed sleeve; The opening component includes an inner pipe section and a top pressure plate. The inner pipe section is nested in the outer pipe section and is located at the end of the outer pipe section away from the pressure relief membrane. The top pressure plate is a hollow plate, which is fixed in the inner pipe section. When the pressure relief valve is connected to the one-way valve, it presses the sealing column to open the one-way valve so that the inner cavity of the pressure relief valve is connected to the inner cavity of the electrolyte sharing chamber.

10. The pressure relief valve according to claim 9, characterized in that The outer pipe section and the fixing sleeve are connected through a tapered pipe thread, and thread sealant is coated between the connecting threads.

11. The pressure relief valve according to claim 9, characterized in that A first sealing ring is provided between the outer wall of the inner pipe section and the inner wall of the fixing sleeve.

12. The pressure relief valve according to claim 9, characterized in that An annular clamping platform is provided on the inner wall of the outer tube section, and an annular step is provided on the outer wall of the inner tube section. The annular clamping platform of the outer tube section axially positions the annular step of the inner tube section so that the outer tube section drives the inner tube section to move axially.

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