Liquid injection valve, liquid injection device, and liquid injection method

Abstract

The application provides a liquid injection valve, a liquid injection device and a liquid injection method, and belongs to the technical field of battery manufacturing. The liquid injection valve comprises a housing, the housing defining a valve inlet; a valve core, the valve core being arranged in the housing; a sleeve, the sleeve being partially arranged in the housing; and a liquid injection pipe, the liquid injection pipe being movably arranged in the valve core and the sleeve, and comprising a liquid injection outlet and an inlet end located in the valve core, in a first state in which the sleeve and the liquid injection pipe are jointly pushed towards the inside of the housing, a seal is formed between the inlet end and the valve core, thereby disconnecting a fluid passage from the valve inlet to the liquid injection outlet via the valve core.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery manufacturing, and in particular to a liquid injection valve, a liquid injection device and a liquid injection method. BACKGROUND

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

[0003] As a kind of battery, lithium battery usually uses electrolyte as the medium for charging and discharging. Liquid injection (electrolyte injection) is an important process in the production of lithium ion batteries. The quality of liquid injection will not only affect the performance of the battery, but also affect the production efficiency of the battery. Before liquid injection, a low pressure or vacuum environment can be formed inside the battery, and then the liquid injection pipe of the liquid injection device is aligned with the liquid injection port of the battery to allow the electrolyte to be injected from the liquid injection device into the battery. SUMMARY

[0004] The present application provides a liquid injection valve, a liquid injection device and a liquid injection method.

[0005] The first aspect of the present application provides a liquid injection valve, comprising: a housing defining a valve inlet; a valve core disposed in the housing; a sleeve partially disposed in the housing; and a liquid injection pipe movably disposed in the valve core and the sleeve, and comprising a liquid injection outlet and an inlet end located in the valve core, in a first state in which the sleeve and the liquid injection pipe are jointly pushed towards the inside of the housing, a seal is formed between the inlet end and the valve core, thereby disconnecting the fluid passage from the valve inlet to the liquid injection outlet via the valve core.

[0006] In the technical solution of the present application, during the liquid injection process, if the liquid injection pipe is not aligned with the liquid injection port of the liquid injection object, the sleeve and the liquid injection pipe are jointly pushed towards the inside of the housing, a seal is formed between the inlet end and the valve core, thereby disconnecting the fluid passage from the valve inlet to the liquid injection outlet via the valve core. Thus, the fluid overflow or leakage can be reduced, thereby improving the liquid injection efficiency and the battery yield.

[0007] In some embodiments, the sleeve comprises a through hole, and the liquid injection pipe is at least partially disposed in the through hole, and in the first state, the liquid injection outlet is sealed by the inner wall of the through hole. Thus, the seal between the liquid injection outlet and the through hole can further reduce the possibility of liquid leakage from the liquid injection outlet remaining in the liquid injection pipe.

[0008] In some embodiments, the valve core defines an internal cavity, and the inlet end of the liquid injection tube is located in the internal cavity, and in the first state, a first seal is formed between the inlet end and a first surface of the internal cavity of the valve core. By forming the internal cavity in the valve core, space is provided for the movement of the liquid injection tube therein, and a seal is formed between the liquid injection tube and the surface of the internal cavity, so that the seal can be formed when the liquid injection tube is moved to the appropriate position relative to the valve core, and the structure is simple.

[0009] In some embodiments, the valve core defines an internal cavity, and the inlet end of the liquid injection tube is located in the internal cavity, and the liquid injection valve comprises a first elastic member, and in the second state, the liquid injection tube is located at a position where a second seal is formed between the inlet end and a second surface of the internal cavity of the valve core under the action of the first elastic member, thereby disconnecting the fluid passage. By forming the internal cavity in the valve core, space is provided for the movement of the liquid injection tube therein, and a seal is formed between the liquid injection tube and the surface of the internal cavity, so that the seal can be formed when the liquid injection tube is moved to the appropriate position relative to the valve core, thereby reducing liquid drops, and the structure is simple.

[0010] In some embodiments, the liquid injection valve comprises a second elastic member, and a seal is formed between the sleeve and the housing, and during the process of the liquid injection valve entering the second state, part of the sleeve is pushed out of the housing under the action of the second elastic member, so that the air pressure of the area between the housing and the sleeve is less than the air pressure outside the housing. Because the air pressure of the area between the housing and the sleeve is less than the air pressure outside the housing, when the liquid injection valve is lifted from the battery, for example, during the process of the liquid injection valve entering the second state, the area forms a negative pressure area, thereby providing a tendency for the surrounding liquid to flow to the area, thereby further reducing the occurrence of electrolyte leakage.

[0011] In some embodiments, the liquid injection valve comprises a third elastic member, and the housing comprises a valve body, and the valve core is movably arranged in the valve body, and in the second state of the liquid injection valve, the valve core is moved to a position where a third seal is formed between the outer surface of the valve core and the inner surface of the valve body under the action of the third elastic member. Thus, in the second state of the liquid injection valve, the fluid can be further blocked from entering the internal cavity of the valve core through the position, thereby further improving the sealing effect of the liquid injection valve in the second state.

[0012] In some embodiments, the inlet end of the liquid injection tube comprises a flange, the valve core comprises a through hole extending through the wall of the valve core from the internal cavity, and in the second state, the flange forms a second seal to the through hole. By providing the through hole on the valve core and the flange on the liquid injection tube, the flange forms a second seal to the through hole, so that the liquid injection tube seals the valve core while the valve core limits the liquid injection tube.

[0013] In some embodiments, in the second state, the liquid injection outlet is sealed by the sleeve. Thus, the possibility of liquid leakage can be further reduced.

[0014] In some embodiments, the sleeve comprises an elastic rubber sleeve, and the inner wall of the through hole of the sleeve closely fits the outer wall of the liquid injection tube. By closely fitting the inner wall of the through hole of the sleeve to the outer wall of the liquid injection tube, the liquid droplets hanging on the outer wall of the liquid injection tube or the inner wall of the through hole can be reduced to drop downward, thereby further improving the sealing performance of the liquid injection valve.

[0015] In some embodiments, the liquid injection outlet is located on the side wall of the liquid injection tube. By providing the liquid injection outlet on the side wall of the liquid injection tube, when the liquid injection tube is retracted into the sleeve, the sleeve can block and seal the liquid injection outlet to some extent, thereby reducing liquid leakage.

[0016] In some embodiments, the sleeve can be pushed towards the inside of the housing independently of the liquid injection tube to expose the liquid injection outlet of the liquid injection tube and cause the valve core to move relative to the liquid injection tube to open the fluid passage. Thus, when the liquid injection tube is roughly aligned with the liquid injection hole of the liquid injection object, rapid and efficient liquid injection can be achieved.

[0017] In some embodiments, the sleeve comprises a chamber having an opening located at the bottom of the part of the sleeve disposed outside the housing. Thus, when, for example, a problem of insufficient sealing occurs at the sleeve, the positive air pressure in the chamber of the sleeve can press the fluid to be leaked back towards the liquid injection source, thereby further reducing the occurrence of liquid leakage.

[0018] In some embodiments, the opening of the chamber is disposed around the through hole. The opening of the chamber disposed around the through hole can reduce the possibility of liquid leakage from each angle around the through hole.

[0019] In some embodiments, the opening is configured to be sealed by the surface of the liquid injection object. Thus, the air tightness of the chamber can be improved, so that the chamber can better maintain the internal positive air pressure.

[0020] In some embodiments, the housing comprises a sleeve shell, the sleeve is partially disposed in the sleeve shell, and the sleeve shell can move with the sleeve, the sleeve comprises a first passage in fluid communication with the chamber, and the sleeve shell comprises a second passage in fluid communication with the first passage, and the second passage has a gas interface. By providing the second passage in fluid communication with the first passage of the sleeve in the sleeve shell, and providing the gas interface, the chamber of the sleeve is continuously supplied with gas during the movement of the sleeve shell with the sleeve, so as to maintain the positive air pressure in the chamber.

[0021] In some embodiments, the liquid injection valve further comprises a gas pressure sensor configured to detect the gas pressure in the chamber. By using the gas pressure sensor to conduct a gas tightness check on the sleeve, especially the chamber part, a prompt can be given in time when the gas tightness is insufficient, and the liquid injection can be stopped in time to avoid the risk of liquid leakage or even liquid spraying.

[0022] In some embodiments, the liquid injection valve further comprises a fourth elastic member and a valve mounting seat, and the housing is connected to the valve mounting seat in a floating manner through the fourth elastic member. The fourth elastic member with a preset elastic force will offset the excessive downward pressure, thereby reducing the damage of excessive pressure to the battery to be injected, thereby protecting the battery.

[0023] In some embodiments, the liquid injection valve further comprises a quick release connector connected to the housing and used to connect the valve inlet to a liquid injection source. In this way, the liquid injection valve can be quickly matched with different liquid injection machines.

[0024] Embodiments of the second aspect of the present application provide a liquid injection device, comprising: a liquid injection source; a liquid injection valve according to the first aspect of the present application, the liquid injection valve being in communication with the liquid injection source; and an execution structure connected to the liquid injection valve and used to move the liquid injection valve to inject a liquid into a liquid injection object. In this way, the liquid injection efficiency and the battery yield can be improved.

[0025] Embodiments of the third aspect of the present application provide a method for liquid injection using a liquid injection valve according to the first aspect of the present application, comprising: moving the liquid injection valve to align the through hole of the sleeve with the liquid injection hole of the liquid injection object; moving the liquid injection valve towards the liquid injection object to make the sleeve adhere to the surface of the liquid injection object; and continuing to move the liquid injection valve towards the liquid injection object to make the sleeve at least partially enter the inside of the housing to expose the liquid injection outlet of the liquid injection pipe. In this way, the liquid injection efficiency and the battery yield can be improved.

[0026] The above description is only a summary of the technical solutions of the present application. In order to more clearly understand the technical means of the present application, the specific embodiments of the present application can be implemented according to the content of the description, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0027] In the drawings, identical or similar components or elements are denoted by identical reference numerals throughout the several views, unless otherwise specified. The drawings are not necessarily to scale. It is to be understood that these drawings only depict some embodiments in accordance with the disclosure and should not be considered as limiting the scope of the disclosure.

[0028] Figures 1A-1C Structure schematic diagram of the liquid injection valve of some embodiments of the present application;

[0029] Figure 2AA cross-sectional view of a first state of a liquid injection valve according to some embodiments of the present application;

[0030] Figure 2B A cross-sectional view of a second state of a liquid injection valve according to some embodiments of the present application; Figure 2A An enlarged view of a portion of the liquid injection valve shown in FIG. 1;

[0031] Figure 3A A cross-sectional view of a second state of a liquid injection valve according to some embodiments of the present application;

[0032] Figure 3B A cross-sectional view of a second state of a liquid injection valve according to some embodiments of the present application; Figure 3A An enlarged view of a portion of the liquid injection valve shown in FIG. 1;

[0033] Figure 4A A cross-sectional view of a second state of a liquid injection valve according to some embodiments of the present application;

[0034] Figure 4B A cross-sectional view of a second state of a liquid injection valve according to some embodiments of the present application; Figure 4A An enlarged view of a portion of the liquid injection valve shown in FIG. 1;

[0035] Figure 5A A cross-sectional view of a second state of a liquid injection valve according to some embodiments of the present application;

[0036] Figure 5B A cross-sectional view of a second state of a liquid injection valve according to some embodiments of the present application; Figure 5A An enlarged view of a portion of the liquid injection valve shown in FIG. 1;

[0037] Figure 6A A cross-sectional view of a second state of a liquid injection valve according to some embodiments of the present application;

[0038] Figure 6B A cross-sectional view of a second state of a liquid injection valve according to some embodiments of the present application; Figure 6A An enlarged view of a portion of the liquid injection valve shown in FIG. 1;

[0039] Figure 7A A cross-sectional view of a second state of a liquid injection valve according to some embodiments of the present application;

[0040] Figure 7B A cross-sectional view of a second state of a liquid injection valve according to some embodiments of the present application; Figure 7A An enlarged view of a portion of the liquid injection valve shown in FIG. 1; DETAILED DESCRIPTION

[0041] The embodiments of the present application will be described below in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore cannot be used to limit the protection scope of the present application.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application; the use of the terms "including," "comprising," or "having" and variations thereof herein is intended to be broad and encompass the terms "consisting of" and "consisting essentially of" and variations thereof. Unless otherwise required by context, singular terms shall include pluralities and vice versa. Unless otherwise required by context, the use herein of the singular is also to be construed as a use of the plural and vice versa.

[0043] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise explicitly and specifically limited.

[0044] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification is not necessarily all referring to the same embodiment, or to a particular embodiment, or to a particular set of embodiments. It will be explicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0045] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " herein generally represents an "or" relationship between the front and rear associated objects.

[0046] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two), and similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0047] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as limiting the embodiments of the present application, which do not indicate or imply that the indicated devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0048] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0049] As mentioned above, the quality of electrolyte injection not only affects battery performance but also battery production efficiency. In the electrolyte injection process of battery production, an injection nozzle is typically used to inject electrolyte into the battery. In related technologies, an injection valve with an injection nozzle can be used to inject electrolyte into the battery. For example, the injection nozzle of the injection valve can be aligned with the battery's injection port, and then the injection valve can be opened to allow electrolyte to be injected into the battery through the injection nozzle. However, in the electrolyte injection process of related technologies, the injection nozzle may not be aligned with the injection port. If the injection valve is opened when the injection nozzle is not aligned with the injection port, the electrolyte flowing from the injection nozzle may overflow onto the outside of the battery or leak, potentially causing electrolyte contamination and severely affecting battery quality and battery production efficiency.

[0050] In view of this, embodiments of this application provide a liquid injection valve, comprising: a housing defining a valve inlet; a valve core disposed within the housing; a sleeve partially disposed within the housing; and an injection tube movably disposed within the valve core and the sleeve, and including an injection outlet and an inlet end located within the valve core. During liquid injection, if the injection tube is not aligned with the injection port of the component to be injected, the sleeve and the injection tube are pushed together toward the interior of the housing, forming a seal between the inlet end and the valve core, thereby disconnecting the fluid passage from the valve inlet through the valve core to the injection outlet, thereby reducing fluid overflow or leakage, and thus improving liquid injection efficiency and battery efficiency.

[0051] The liquid injection valve disclosed in this application can be applied to battery production, for example, for injecting electrolyte into batteries. The liquid injection valve disclosed in this application can also be applied to other scenarios requiring fluid injection, such as for injecting oil during oil transportation; or for injecting other chemical substances.

[0052] This application provides a liquid injection valve 1. Figures 1A-1C This is a schematic diagram of the structure of the injection valve 1 in some embodiments of this application; Figure 2A This is a schematic diagram of the first state of the injection valve 1 in some embodiments of this application;

[0053] Figure 2B Some embodiments of this application Figure 2AA partial enlarged view of the liquid injection valve 1 is shown. As shown Figures 1A-2B The liquid injection valve 1 includes a housing 100 defining a valve inlet 101, a valve core 200 disposed in the housing 100, a sleeve 300 partially disposed in the housing 100, and a liquid injection pipe 400 movably disposed in the valve core 200 and the sleeve 300, and including a liquid injection outlet 401 and an inlet end 410 located in the valve core 200.

[0054] In a first state in which the sleeve 300 and the liquid injection pipe 400 are jointly pushed towards the inside of the housing 100 (i.e. Figure 2A And Figure 2B As shown, a seal is formed between the inlet end 410 and the valve core 200, thereby disconnecting the fluid passage from the valve inlet 101 to the liquid injection outlet 401 via the valve core 200. For example, in the example shown Figure 2B The dashed arrow shows that the fluid passage is disconnected at the seal formed between the inlet end 410 and the valve core 200, so that the fluid cannot continue to flow out via the inlet end 410 and the liquid injection outlet 401.

[0055] The valve inlet 101 can be located at the upper end of the housing 100, and can serve as an inlet for fluid (e.g. electrolyte) into the liquid injection valve 1. The valve inlet 101 can have a connection feature, for example, the valve inlet 101 can have a connection thread or a connection buckle, etc.

[0056] The valve core 200 can be a one-piece structure, or can be composed of two or more components, for example, the valve core 200 can include an upper valve core and a lower valve core, and the upper valve core and the lower valve core can be connected by threads.

[0057] The sleeve 300 is partially disposed in the housing 100, and the remaining part of the sleeve 300 can be disposed outside the housing 100. The size of the part of the sleeve 300 located outside the housing 100 can be set according to different liquid injection objects. For example, the diameter of the part of the sleeve 300 located outside the housing 100 can be set according to the diameter of the liquid injection port and / or the liquid injection port sink of the to-be-injected object (e.g. battery).

[0058] The liquid injection pipe 400 is movably disposed in the valve core 200 and the sleeve 300, i.e. the liquid injection pipe 400 can move in the valve core 200 and the sleeve 300. The liquid injection pipe 400 can have an internal fluid passage to allow fluid (e.g. electrolyte) to flow in via the inlet end 410 of the liquid injection pipe 400 and out from the liquid injection outlet 401 of the liquid injection pipe 400.

[0059] The first state can be a state in which the liquid injection pipe 400 and the sleeve 300 are pressed onto the to-be-injected object, and the liquid injection pipe 400 is not aligned with the liquid injection port of the to-be-injected object.

[0060] During the liquid injection process, if the liquid injection pipe 400 is not aligned with the liquid injection port of the liquid injection object (as shown in Figure 2B , the sleeve 300 and the liquid injection pipe 400 are jointly pushed towards the inside of the housing 100, and a seal is formed between the inlet end 410 and the valve core 200, thereby disconnecting the fluid passage from the valve inlet 101 to the liquid injection outlet 401 via the valve core 200, so as to reduce the overflow or leakage of the fluid from the liquid injection valve 1, thereby improving the liquid injection efficiency and the battery rate.

[0061] The sleeve 300 can include a through hole 301. And continuing to refer to Figure 2A and Figure 2B , the liquid injection pipe 400 is at least partially arranged in the through hole 301, and in the first state, the liquid injection outlet 401 is sealed by the inner wall of the through hole 301.

[0062] The diameter of the through hole 301 can be substantially equal to the diameter of the liquid injection pipe 400. The through hole 301 can be formed in clearance fit or interference fit with the liquid injection pipe 400. As shown in Figure 2B , in the first state, the liquid injection outlet 401 is circumferentially wrapped by the through hole 301 of the sleeve 300, and the liquid injection outlet 401 does not protrude out of the sleeve 300, so that the liquid injection outlet 401 is sealed by the inner wall of the through hole 301.

[0063] In an example, the materials of the sleeve 300 and the liquid injection pipe 400 can be different, for example, the sleeve 300 can be an elastic material to improve the sealing effect.

[0064] Therefore, if the liquid injection pipe 400 is not aligned with the liquid injection port of the liquid injection object (as shown in Figure 2B , the seal between the liquid injection outlet 401 and the through hole 301 can further reduce the leakage of the liquid remaining in the liquid injection pipe 400 from the liquid injection outlet 401. In other words, in the first state, in addition to the seal formed between the inlet end 410 and the valve core 200, by further forming the seal between the liquid injection outlet 401 and the through hole 301, the possibility of liquid leakage can be further reduced.

[0065] According to some embodiments of the present application, further referring to Figure 2A and Figure 2B , the valve core 200 can define an internal cavity 201, and the inlet end 410 of the liquid injection pipe 400 is located in the internal cavity 201, and in the first state, a first seal is formed between the inlet end 410 and the first surface of the internal cavity 201 of the valve core 200.

[0066] In an example, the valve core 200 can include an upper valve core and a lower valve core, and the upper valve core and the lower valve core can be disassembled and assembled with each other. For example, the upper valve core and the lower valve core can be connected through threads. Accordingly, the internal cavity 201 can be formed by the upper valve core and the lower valve core together. When assembling, the liquid injection pipe 400 can be first installed into the lower valve core, and then the lower valve core and the upper valve core are assembled together. In an example, the valve core 200 can also be formed integrally.

[0067] In the first state, a first seal is formed between the inlet end 410 and a first surface of the internal cavity 201 of the valve core 200. The first surface can be located at the top of the valve core 200. In this way, the electrolyte in the internal cavity 201 cannot enter the liquid injection pipe 400 from the inlet end 410. In addition, a sealing ring can be arranged between the inlet end 410 and the first surface to enhance the effect of the first seal.

[0068] By forming the internal cavity 201 in the valve core 200, a space is provided for the movement of the liquid injection pipe 400 therein, and by the cooperation between the liquid injection pipe 400 and the surface of the internal cavity 201 to form a seal, the first seal can be formed when the liquid injection pipe 400 moves to the appropriate position relative to the valve core 200, thereby reducing liquid drops and having a simple structure.

[0069] Figure 3A a cross-sectional view of a second state of a liquid injection valve of some embodiments of the present application; and Figure 3B a cross-sectional view of a second state of a liquid injection valve of some embodiments of the present application; and Figure 3A a cross-sectional view of a second state of a liquid injection valve of some embodiments of the present application; and Figure 3A and Figure 3B The valve core 200 can define an internal cavity 201, and the inlet end 410 of the liquid injection pipe 400 is located in the internal cavity 201, and the liquid injection valve 1 can include a first elastic member 510. As shown in Figure 3A and Figure 3B In the second state, the liquid injection pipe 400 is located between the inlet end 410 and a second surface of the internal cavity 201 of the valve core 200 under the action of the first elastic member 510 to form a second seal, thereby disconnecting the fluid passage.

[0070] In an example, the second state can be a state in which the liquid injection valve 1 is not working or stops liquid injection.

[0071] The first elastic member 510 can be a spring, and one end of the first elastic member 510 can be fixed with the liquid injection pipe 400 for resetting of the liquid injection pipe 400. Under the action of the first elastic member 510, as shown in Figure 3A and Figure 3BAs shown, the liquid injection pipe 400 is pressed downward, so that the inlet end 410 forms a second seal with the second surface of the inner cavity 201 of the valve core 200 (for example, the surface located at the lower part of the inner cavity 201).

[0072] In this way, the electrolyte can be prevented from entering the inner cavity 201, and the second seal formed between the inlet end 410 and the second surface of the inner cavity 201 of the valve core 200 makes the electrolyte remaining in the inner cavity 201 unable to continue to be discharged through the liquid injection pipe 400 under the action of pressure. In addition, a sealing ring can be arranged between the inlet end 410 and the second surface to enhance the effect of the second seal.

[0073] By forming the inner cavity 201 in the valve core 200, space is provided for the movement of the liquid injection pipe 400 therein, and by forming a seal through the cooperation between the liquid injection pipe 400 and the surface of the inner cavity 201, the second seal can be formed when the liquid injection pipe 400 is moved to the appropriate position relative to the valve core 200, thereby reducing liquid dripping and having a simple structure.

[0074] According to some embodiments of the present application, with reference to Figure 3A , the liquid injection valve 1 can include a second elastic member 520, and a seal is formed between the sleeve 300 and the housing 100, during the process of the liquid injection valve 1 entering the second state, part of the sleeve 300 is pushed out of the housing 100 under the action of the second elastic member 520, so that the air pressure of the region 3 between the housing 100 and the sleeve 300 is less than the air pressure outside the housing 100.

[0075] With reference to Figure 3A , a seal is formed between the part 302 of the sleeve 300 extending out of the housing and the housing 100, during the process of the liquid injection valve 1 entering the second state (for example, during the process of entering the second state from the first state), the part 302 of the sleeve 300 is pushed out of the housing 100 under the action of the second elastic member 520 (the second elastic member 520 can be a spring), and due to the part 302 being pushed out of the housing 100, the part of the sleeve 300 located inside the housing 100 becomes less, thereby causing the volume of the cavity inside the housing 100 to increase. Since a seal is formed between the part 302 of the sleeve 300 extending out of the housing and the housing 100, in the case that the amount of gas in the cavity remains basically unchanged, the increase in the volume of the cavity causes the air pressure of the region 3 between the housing 100 and the sleeve 300 to be less than the air pressure outside the housing 100.

[0076] Since the air pressure of the region 3 between the housing 100 and the sleeve 300 is less than the air pressure outside the housing 100, when the liquid injection valve 1 is lifted from the battery, for example, during the process of the liquid injection valve 1 entering the second state, the region 3 forms a negative pressure area, thereby giving the surrounding liquid a tendency to flow to the region 3, thereby further reducing the occurrence of the case of electrolyte leaking outwards.

[0077] According to some embodiments of the present application, with reference to Figure 3A , the liquid injection valve 1 can comprise a third elastic member 530, and the housing 100 can comprise a valve body 110, in which the valve core 200 is movably arranged, in the second state of the liquid injection valve 1, the valve core 200 is moved to a position in which a third seal is formed between the outer surface of the valve core 200 and the inner surface of the valve body 110 under the action of the third elastic member 530.

[0078] In an example, the valve body 110 can comprise an upper valve body and a lower valve body, and the upper valve body and the lower valve body can be detachable and assembled with each other. For example, the upper valve body and the lower valve body can be connected by threads. Correspondingly, the valve core 200 can be fitted into the cavity formed by the upper valve body and the lower valve body. In an example, the valve body 110 can also be integrally formed.

[0079] The third elastic member 530 can be a spring. In addition, a sealing ring can be arranged between the outer surface of the valve core 200 and the inner surface of the valve body 110 to enhance the effect of the third seal.

[0080] Thus, in the second state of the liquid injection valve 1, the valve core 200 is moved to a position in which a third seal is formed between the outer surface of the valve core 200 and the inner surface of the valve body 110 under the action of the third elastic member 530, which can further block the fluid from entering the internal cavity of the valve core 200 via the position, thereby further improving the sealing effect of the liquid injection valve 1 in the second state.

[0081] Figure 4A is a schematic view of the A-A cross section of the liquid injection state of the liquid injection valve 1 of some embodiments of the present application; and Figure 4B is a schematic view of the B-B cross section of the liquid injection state of the liquid injection valve 1 of some embodiments of the present application. Figure 4A is a partial enlarged view of the liquid injection valve shown in

[0082] According to some embodiments of the present application, as shown in Figure 4A and Figure 4B , the sleeve 300 can be pushed towards the inside of the housing 100 to expose the liquid injection outlet 401 of the liquid injection pipe 400 independently of the liquid injection pipe 400, and cause the valve core 200 to move relative to the liquid injection pipe 400 to open the fluid passage from the valve inlet 101 to the liquid injection outlet 401 via the valve core 200.

[0083] As shown in Figure 4A and 4B , the sleeve 300 can be pushed towards the inside of the housing 100 to expose the liquid injection outlet 401 of the liquid injection pipe 400 independently of the liquid injection pipe 400, and cause the valve core 200 to move relative to the liquid injection pipe 400 to open the fluid passage from the valve inlet 101 to the liquid injection outlet 401 via the valve core 200.As shown, after the liquid injection pipe 400 is roughly aligned with the liquid injection hole 2 of the liquid injection object, the liquid injection valve 1 can be pressed downward, so that the sleeve 300 of the liquid injection valve 1 is in contact with the surface of the component around the liquid injection hole of the liquid injection object, and the sleeve 300 is at least partially pushed towards the inside of the housing 100 under the force. At this time, since the liquid injection pipe 400 is pushed into the liquid injection hole 2 by pressing the liquid injection valve 1 downward when the liquid injection pipe 400 is roughly aligned with the liquid injection hole 2 of the liquid injection object. In other words, the sleeve 300 can be pushed towards the inside of the housing 100 independently of the liquid injection pipe 400 to expose the liquid injection outlet 401 of the liquid injection pipe 400.

[0084] In addition, as the sleeve 300 is pushed upward, the valve core 200 is moved relative to the liquid injection pipe 400 to open the fluid passage from the valve inlet 101 to the liquid injection outlet 401 via the valve core 200 as shown by the dashed line.

[0085] Thus, after the liquid injection pipe 400 is roughly aligned with the liquid injection hole of the liquid injection object, rapid and efficient liquid injection can be achieved.

[0086] According to some embodiments of the present application, the inlet end 410 of the liquid injection pipe 400 can include a flange, the valve core 200 can include a perforation extending through the wall of the valve core from the internal cavity, and in the second state, the flange forms a second seal against the perforation.

[0087] Figure 5A Structure diagram of the liquid injection pipe 400 of the liquid injection valve 1 of some embodiments of the present application; Figure 5B Structure diagram of the liquid injection valve of some embodiments of the present application Figure 5A B-B sectional view of the liquid injection pipe 400 as shown; Figure 6A Structure diagram of the valve core of the liquid injection valve of some embodiments of the present application; and Figure 6B Structure diagram of the liquid injection valve of some embodiments of the present application Figure 6A C-C sectional view of the valve core as shown.

[0088] As shown in Figure 5A and Figure 5B , the inlet end 410 of the liquid injection pipe 400 can include a flange 411. In addition, as shown in Figure 6A and Figure 6B , the valve core 200 can include a perforation 202 extending through the wall of the valve core 200 from the internal cavity 201, the perforation 202 allowing fluid to flow from the outside of the wall of the valve core 200 to the inside of the wall to enter the internal cavity 201 of the valve core 200. In the second state, the flange 411 forms a second seal against the perforation 202.

[0089] In an example, a sealing ring can be provided between the flange 411 and the outer periphery of the perforation 202 to improve sealing performance. Accordingly, the flange 411 can include a sealing ring groove 412 as shown in Figure 5BThe annular groove shown is used to place a sealing ring.

[0090] By setting a through hole on the valve core 200 and a flange on the liquid injection pipe 400, a second seal is formed between the through hole and the flange, so that the liquid injection pipe 400 seals the valve core 200 while the valve core 200 limits the liquid injection pipe 400.

[0091] According to some embodiments of the present application, in the second state, the liquid injection outlet 401 can be sealed by the sleeve 300.

[0092] In an example, the liquid injection outlet 401 can be sealed by the inner wall of the through hole 301 of the sleeve 300.

[0093] In an example, in the second state, not only is a third seal formed between the outer surface of the valve core 200 and the inner surface of the valve body 110, but a seal is also formed between the liquid injection outlet 401 and the through hole 301. In other words, in the second state, in addition to the seal formed between the inlet end 410 and the valve core 200, a seal between the liquid injection outlet 401 and the through hole 301, and a seal between the outer surface of the valve core 200 and the inner surface of the valve body 110 can be further formed.

[0094] In this way, the possibility of liquid leakage can be further reduced.

[0095] According to some embodiments of the present application, the sleeve 300 can include an elastic rubber sleeve, and the inner wall of the through hole 301 of the sleeve 300 tightly fits the outer wall of the liquid injection pipe 400.

[0096] In an example, the elastic rubber sleeve can be made of rubber material. In an example, a lubricating liquid can be attached between the inner wall of the through hole 301 of the sleeve 300 and the outer wall of the liquid injection pipe 400.

[0097] By tightly fitting the inner wall of the through hole 301 of the sleeve 300 to the outer wall of the liquid injection pipe 400, the liquid droplets hanging on the outer wall of the liquid injection pipe 400 or the inner wall of the through hole 301 can be reduced to drip downward, thereby further improving the sealing performance of the liquid injection valve 1.

[0098] According to some embodiments of the present application, the liquid injection outlet 401 can be located on the side wall of the liquid injection pipe 400.

[0099] Reference Figure 5A and Figure 5B A plurality of liquid injection outlets 401 can be provided on the side wall of the liquid injection pipe 400.

[0100] By providing the liquid injection outlet 401 on the side wall of the liquid injection pipe 400, when the liquid injection pipe 400 is retracted into the sleeve 300, the sleeve 300 can block and seal the liquid injection outlet 401 to some extent, thereby reducing liquid leakage.

[0101] According to some embodiments of the present application, the sleeve 300 can include a chamber having an opening at the bottom of the portion of the sleeve disposed outside the housing.

[0102] Reference is made to Figure 7A and Figure 7B wherein, Figure 7A is a schematic view of the structure of the sleeve 300 of the liquid injection valve 1 according to some embodiments of the present application; Figure 7B is a schematic view of the structure of the sleeve 300 of the liquid injection valve 1 according to some embodiments of the present application; Figure 7A is a schematic view of the cross-section of the sleeve 300 of the liquid injection valve 1 according to some embodiments of the present application.

[0103] As shown in Figure 7A and Figure 7B , the sleeve 300 can include a chamber 311 having an opening at the bottom of the portion 302 of the sleeve 300 disposed outside the housing.

[0104] In an example, the chamber 311 can be disposed at a position close to the bottom of the portion 302 as shown in Figure 7B . In an example, the chamber 311 can also be disposed at other positions of the sleeve 300 as long as the opening thereof is disposed at the bottom of the portion 302.

[0105] In an example, a gas can be provided in the chamber 311 so that the gas pressure in the chamber 311 is greater than the gas pressure of the ambient environment, or the gas pressure in the chamber 311 is greater than the gas pressure in the liquid injection source (e.g. a liquid injection cup).

[0106] In an example, the gas pressure in the chamber 311 can be maintained at above 0.3Mpa.

[0107] In this way, when a problem of insufficient sealing occurs at the sleeve 300 for example, the positive gas pressure in the chamber 311 of the sleeve 300 can press the fluid to be leaked back towards the liquid injection source (e.g. a liquid injection cup), thereby further reducing the occurrence of liquid leakage.

[0108] According to some embodiments of the present application, the opening of the chamber 311 can be disposed around the through hole 301.

[0109] The opening of the chamber 311 can be disposed with a certain gap from the through hole 301, and the size of the opening of the chamber 311 can be set according to the diameter of the liquid injection port and / or the liquid injection port sink of the liquid injection object (e.g. a battery).

[0110] The opening of the chamber 311 disposed around the through hole 301 can reduce the possibility of liquid leakage occurring from each angle around the through hole 301.

[0111] According to some embodiments of the present application, the opening of the chamber 311 can be configured to be sealed by the surface of the liquid injection object.

[0112] For example, when the liquid injection object has a flat surface, the opening edge of the chamber 311 can be set to be relatively flat, so that the opening edge of the chamber 311 can better match the surface of the liquid injection object, so that the opening of the chamber 311 can be sealed by the surface of the liquid injection object.

[0113] For example, when the liquid injection object has a stepped surface, the opening edge of the chamber 311 can be set to have a matching stepped shape, so that the opening edge of the chamber 311 can better match the surface of the liquid injection object, so that the opening of the chamber 311 can be sealed by the surface of the liquid injection object.

[0114] In this way, the air tightness of the chamber 311 can be improved, so that the chamber 311 can better maintain the internal positive air pressure.

[0115] According to some embodiments of the present application, with reference to Figure 2A , Figure 3A or Figure 4A , the shell 100 can include a sleeve shell 600, the sleeve 300 is partially arranged in the sleeve shell 600, and the sleeve shell 600 can move with the sleeve 300. In addition, with reference to Figure 7B , the sleeve 300 includes a first passage 312 in fluid communication with the chamber 311, and the sleeve shell 600 can include a second passage (not shown in the figure) in fluid communication with the first passage 312, and the second passage can have a gas interface.

[0116] The first passage 312 and the second passage can serve as a gas supply passage of the chamber 311. The number of first passages 312 and second passages can be one, two or more. The gas interface can be used to communicate with the air pump or the air cavity of the liquid injection cup, so as to provide air pressure for the chamber 311.

[0117] By arranging the second passage in fluid communication with the first passage 312 of the sleeve 300 in the sleeve shell 600, and providing a gas interface, the chamber 311 of the sleeve 300 is continuously supplied with gas during the movement of the sleeve shell 600 with the sleeve 300, so as to maintain the positive air pressure in the chamber 311.

[0118] According to some embodiments of the present application, the liquid injection valve 1 can further include an air pressure sensor configured to detect the air pressure in the chamber 311.

[0119] In an example, the probe of the air pressure sensor can be arranged in the chamber 311 to detect the air pressure in the chamber 311. For example, piezoresistive or electrostatic capacitive air pressure sensors can be used, which are not described here.

[0120] The air pressure sensor is used to check the air tightness of the sleeve 300, especially the chamber 311, so as to give a prompt in time when the air tightness is insufficient and to stop the liquid injection in time, thereby avoiding the risk of liquid leakage or even liquid spraying.

[0121] According to some embodiments of the present application, the liquid injection valve 1 can further include a fourth elastic member and a valve mounting seat, and the shell is connected to the valve mounting seat in a floating manner through the fourth elastic member.

[0122] With reference to Figure 2A , the liquid injection valve 1 can further include a fourth elastic member 540 and a valve mounting seat 700, and the shell 100 is connected to the valve mounting seat 700 in a floating manner through the fourth elastic member 540.

[0123] In an example, the fourth elastic member 540 can be a spring, which can have a preset elastic force. During the process of automatic liquid injection, the pressure actuator can be connected to the valve mounting seat 700, and the valve mounting seat 700 is pressed down by operating the pressure actuator. Since the valve mounting seat 700 is connected to the shell 100 through the fourth elastic member 540, the entire liquid injection valve 1 will be pressed down by the pressure actuator to perform liquid injection.

[0124] When the pressure of the pressure actuator is too large, since the shell 100 is connected to the valve mounting seat 700 in a floating manner through the fourth elastic member 540, the fourth elastic member 540 with a preset elastic force will offset part of the excessive pressure, thereby reducing the damage of the excessive pressure to the battery to be injected, thereby protecting the battery.

[0125] According to some embodiments of the present application, the liquid injection valve 1 can further include a quick release connector, which is connected to the shell and is used to connect the valve inlet to the liquid injection source.

[0126] With reference to Figure 1A , the liquid injection valve 1 can further include a quick release connector 800, which is connected to the shell 100 and is used to connect the valve inlet 101 to the liquid injection source. The quick release connector 800 can be a docking buckle or a magnetic connecting piece.

[0127] Therefore, the liquid injection valve 1 can quickly match different liquid injection machines.

[0128] The embodiments of the second aspect of the present application provide a liquid injection device, which includes: a liquid injection source; a liquid injection valve 1 according to the first aspect of the present application, the liquid injection valve 1 being in communication with the liquid injection source; and an execution structure connected to the liquid injection valve, which is used to move the liquid injection valve to inject a liquid injection object.

[0129] In an example, the execution structure can move (including rotate) the liquid injection valve 1 to control the liquid injection valve 1 to align with the liquid injection hole of the battery to be injected. In an example, the execution structure can connect the liquid injection valve 1 through the valve mounting seat 700.

[0130] In the liquid injection process, if the liquid injection pipe 400 is not aligned with the liquid injection port of the object to be injected (for example, as shown in Figure 2B , the liquid injection pipe 400 is not aligned with the liquid injection port 2 of the object to be injected), the sleeve 300 and the liquid injection pipe 400 are jointly pushed towards the inside of the housing 100, and a seal is formed between the inlet end 410 and the valve core 200, thereby disconnecting the fluid passage from the valve inlet 101 to the liquid injection outlet 401 via the valve core 200, thereby reducing the overflow or leakage of fluid from the liquid injection valve 1, thereby improving the liquid injection efficiency and improving the battery rate.

[0131] The third aspect of the embodiment of the present application provides a method for injecting liquid using the liquid injection valve 1 according to the first aspect of the present application, comprising: moving the liquid injection valve 1 to align the through hole 301 of the sleeve 300 with the liquid injection hole of the object to be injected; pushing the liquid injection valve 1 towards the object to be injected to make the sleeve 300 fit the surface of the object to be injected; and continuing to push the liquid injection valve 1 towards the object to be injected to make the sleeve 300 at least partially enter the inside of the housing to expose the liquid injection outlet 401 of the liquid injection pipe 400.

[0132] Thereby, the overflow or leakage of fluid from the liquid injection valve 1 can be reduced, thereby improving the liquid injection efficiency and improving the battery rate.

[0133] The technical solutions of the present application are further described below through a specific embodiment.

[0134] As shown in Figures 1A-7B , the liquid injection valve 1 comprises: a housing 100, the housing 100 defining a valve inlet 101; a valve core 200, the valve core 200 being arranged in the housing 100 and defining an internal cavity 201; a sleeve 300, the sleeve 300 being partially arranged in the housing 100, the sleeve 300 can comprise a through hole 301; and a liquid injection pipe 400, the liquid injection pipe 400 being movably arranged in the valve core 200 and the through hole 301 of the sleeve 300, and comprising an inlet end 410 in the internal cavity 201 of the valve core 200 and a liquid injection outlet 401, the liquid injection outlet 401 can be located on the side wall of the liquid injection pipe 400

[0135] In the first state in which the sleeve 300 and the liquid injection pipe 400 are jointly pushed towards the inside of the housing 100 (i.e. the state shown in Figure 2A and Figure 2B , a seal is formed between the inlet end 410 and the valve core 200, thereby disconnecting the fluid passage from the valve inlet 101 to the liquid injection outlet 401 via the valve core 200. For example, in Figure 2BIn the illustrated example, the dashed arrow shows that the fluid path is broken at the seal between the inlet end 410 and the spool 200, so that fluid cannot continue to exit via the inlet end 410 and the liquid outlet 401. Furthermore, in the first state, the liquid outlet 401 is tightly fitted by the inner wall of the through hole 301 of the sleeve 300, so that it is sealed by the inner wall of the through hole 301, and a first seal is formed between the inlet end 410 and the first surface of the internal cavity 201 of the spool 200.

[0136] With reference to Figure 3A and Figure 3B , the liquid injection valve 1 comprises a first elastic member 510. In the second state as illustrated in Figure 3A and Figure 3B , the liquid injection tube 400 is located, under the action of the first elastic member 510, at a position between the inlet end 410 and the second surface of the internal cavity 201 of the spool 200, so that a second seal is formed, thereby breaking the fluid path. The inlet end 410 of the liquid injection tube 400 comprises a flange, and the spool 200 comprises a through hole extending through the wall of the spool from the internal cavity, and in the second state, the flange forms a second seal with the through hole. The liquid injection valve 1 comprises a second elastic member 520, and a seal is formed between the sleeve 300 and the housing 100, and during the process of the liquid injection valve 1 entering the second state, part of the sleeve 300 is pushed out of the housing 100 under the action of the second elastic member 520, so that the air pressure in the region 3 between the housing 100 and the sleeve 300 is less than the air pressure outside the housing 100. Furthermore, the liquid injection valve 1 comprises a third elastic member 530, and the housing 100 can comprise a valve body 110, and the spool 200 is movably arranged in the valve body 110, and in the second state of the liquid injection valve 1, the spool 200 is moved, under the action of the third elastic member 530, to a position where a third seal is formed between the outer surface of the spool 200 and the inner surface of the valve body 110. Furthermore, in the second state, the liquid outlet 401 can be sealed by the sleeve 300.

[0137] As illustrated in Figure 4A and Figure 4B , the sleeve 300 can be pushed towards the inside of the housing 100 independently of the liquid injection tube 400 to expose the liquid outlet 401 of the liquid injection tube 400, and cause the spool 200 to move relative to the liquid injection tube 400 to open the fluid path from the valve inlet 101 via the spool 200 to the liquid outlet 401.

[0138] Furthermore, the sleeve 300 can comprise a chamber 311 having an opening at the bottom of the part 302 of the sleeve 300 arranged outside the housing. The opening of the chamber 311 is arranged around the through hole 301, and the opening of the chamber 311 is configured to be sealable by the surface of the liquid injection target.

[0139] The shell 100 comprises a sleeve shell 600, the sleeve 300 is partially arranged in the sleeve shell 600, and the sleeve shell 600 can move along with the sleeve 300. In addition, referring to Figure 7B The sleeve 300 comprises a first passage 312 in fluid communication with the chamber 311, and the sleeve shell 600 can comprise a second passage in fluid communication with the first passage 312, and the second passage can have a gas interface. The liquid injection valve 1 further comprises a gas pressure sensor configured to detect the gas pressure in the chamber 311. The liquid injection valve 1 further comprises a fourth elastic member and a valve mounting seat, and the shell is connected with the valve mounting seat in a floating manner through the fourth elastic member. The liquid injection valve 1 further comprises a quick release connector connected with the shell and used to connect the valve inlet with a liquid injection source.

[0140] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application. Especially, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A liquid filling valve (1) characterized in that, Comprising: a housing (100) defining a valve inlet (101); a valve core (200) disposed in the housing (100); a sleeve (300) partially disposed in the housing (100); and a liquid injection pipe (400) movably disposed in the valve core (200) and the sleeve (300) and comprising a liquid injection outlet (401) and an inlet end (410) located in the valve core (200), wherein, in a first state in which the sleeve (300) and the liquid injection pipe (400) are jointly pushed towards the inside of the housing (100), a seal is formed between the inlet end (410) and the valve core (200), thereby disconnecting a fluid passage from the valve inlet (101) to the liquid injection outlet (401) via the valve core (200); the sleeve (300) can be pushed towards the inside of the housing (100) independently of the liquid injection pipe (400) to expose the liquid injection outlet (401) of the liquid injection pipe (400) and cause the valve core (200) to move relative to the liquid injection pipe (400) to open the fluid passage. The sleeve (300) comprises a through hole (301), and the liquid injection pipe (400) is at least partially disposed in the through hole (301), in the first state, the liquid injection outlet (401) is sealed by the inner wall of the through hole (301).

2. The filling valve (1) according to claim 1, characterized in that The valve core (200) defines an internal cavity (201), and the inlet end (410) of the liquid injection pipe (400) is located in the internal cavity (201), in the first state, a first seal is formed between the inlet end (410) and a first surface of the internal cavity (201) of the valve core (200).

3. The filling valve (1) according to claim 1 or 2, characterized in that The valve core (200) defines an internal cavity (201), and the inlet end (410) of the liquid injection pipe (400) is located in the internal cavity (201), and the liquid injection valve (1) comprises a first elastic member (510), 4. The filling valve (1) according to claim 1 or 2, characterized in that wherein, in a second state, the liquid injection pipe (400) is located at a position between the inlet end (410) and a second surface of the internal cavity (201) of the valve core (200) to form a second seal under the action of the first elastic member (510), thereby disconnecting the fluid passage. The liquid injection valve (1) comprises a second elastic member (520), and a seal is formed between the sleeve (300) and the housing (100), during the process of the liquid injection valve (1) entering the second state, part of the sleeve (300) is pushed outwards of the housing (100) under the action of the second elastic member (520), causing the air pressure of the area between the housing (100) and the sleeve (300) to be less than the air pressure outside the housing (100).

5. The liquid filling valve (1) according to claim 4, characterized in that ​ 6. The liquid filling valve (1) according to claim 4, characterized in that The liquid injection valve (1) comprises a third elastic member (530), and the shell (100) comprises a valve body (110), and the valve core (200) is movably arranged in the valve body (110), wherein in the second state of the liquid injection valve (1), the valve core (200) is moved to a position where a third seal is formed between the outer surface of the valve core (200) and the inner surface of the valve body (110) under the action of the third elastic member (530).

7. The liquid filling valve (1) according to claim 4, characterized in that The inlet end (410) of the liquid injection pipe (400) comprises a flange (411), and the valve core (200) comprises a perforation (202) extending from the inner cavity (201) through the wall of the valve core (200), and in the second state, the flange (411) forms the second seal on the perforation (202).

8. The liquid filling valve (1) according to claim 4, characterized in that In the second state, the liquid injection outlet (401) is sealed by the sleeve (300).

9. The liquid filling valve (1) according to claim 2, characterized in that The sleeve (300) comprises an elastic rubber sleeve, and the inner wall of the through hole (301) of the sleeve (300) is tightly fitted with the outer wall of the liquid injection pipe (400).

10. The filling valve (1) according to claim 1 or 2, characterized in that The liquid injection outlet (401) is located on the side wall of the liquid injection pipe (400).

11. The liquid filling valve (1) according to claim 2, characterized in that The sleeve (300) comprises a chamber (311) having an opening at the bottom of the part (310) of the sleeve (300) arranged outside the shell (100).

12. The liquid filling valve (1) according to claim 11, characterized in that The opening of the chamber (311) is arranged around the through hole (301).

13. The liquid filling valve (1) according to claim 11, characterized in that The opening is configured to be sealed by the surface of the liquid injection object.

14. The liquid filling valve (1) according to claim 11, characterized in that, The shell (100) comprises a sleeve shell (600), the sleeve (300) is partially arranged in the sleeve shell (600), and the sleeve shell (600) can move with the sleeve (300), the sleeve (300) comprises a first passage (312) in fluid communication with the chamber (311), and the sleeve shell (600) comprises a second passage (102) in fluid communication with the first passage (312), the second passage (102) has a gas interface.

15. The liquid filling valve (1) according to claim 11, characterized in that The liquid injection valve (1) further comprises a gas pressure sensor configured to detect the gas pressure in the chamber (311).

16. The liquid filling valve (1) according to claim 1 or 2, characterized in that The liquid injection valve (1) further comprises a fourth elastic member (540) and a valve mounting seat (700), and the shell (100) is floatingly connected with the valve mounting seat (700) through the fourth elastic member (540).

17. The liquid filling valve (1) according to claim 1 or 2, characterized in that The liquid injection valve (1) further comprises a quick release connector (800) connected with the shell (100) and used for connecting the valve inlet (101) with a liquid injection source.

18. A liquid injection device, characterized by comprising: It comprises: a liquid injection source; the liquid injection valve (1) according to claim 1 or 2, which is in communication with the liquid injection source; and an execution structure connected with the liquid injection valve (1) for moving the liquid injection valve (1) to inject a liquid injection object.

19. A method of liquid injection using the liquid injection valve (1) according to claim 1 or 2, characterized by, It comprises: moving the liquid injection valve (1) to align the through hole (301) of the sleeve (300) with the liquid injection hole of the liquid injection object; Push the liquid injection valve (1) towards the liquid injection object to make the sleeve (300) adhere to the surface of the liquid injection object; and Continue to push the liquid injection valve (1) towards the liquid injection object to make the sleeve (300) at least partially enter the inside of the shell (100) to expose the liquid injection outlet (401) of the liquid injection pipe (400).

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