Liquid injection valve, liquid injection device and liquid injection method

Abstract

The invention 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 defining a valve inlet; the valve core is arranged in the shell; the sleeve is partially arranged in the shell; and the liquid injection pipe is movably arranged in the valve element and the sleeve and comprises a liquid injection outlet and an inlet end located in the valve element, and in the first state that the sleeve and the liquid injection pipe are jointly pushed towards the interior of the shell, sealing is formed between the inlet end and the valve element, so that a fluid channel from the valve inlet to the liquid injection outlet through the valve element is disconnected.

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 Art

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

[0003] As a type of battery, lithium batteries usually use electrolyte as a medium for charging and discharging. Injection of electrolyte is an important process in the manufacturing process of lithium-ion batteries. The effect of injection not only affects the performance of the battery, but also affects the production efficiency of the battery. Before injection, a low pressure or vacuum environment can be formed inside the battery, and then the injection tube of the injection equipment is aligned with the injection port of the battery to allow the electrolyte to be injected into the battery from the injection equipment. Summary of the invention

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

[0005] An embodiment of the first aspect of the present application provides a liquid injection valve, comprising: a shell body, which defines a valve inlet; a valve core, which is arranged in the shell body; a sleeve, which is partially arranged in the shell body; and an injection tube, which is movably arranged in the valve core and the sleeve, and comprises an injection outlet and an inlet end located in the valve core, in a first state in which the sleeve and the injection tube are jointly pushed toward the interior of the shell body, a seal is formed between the inlet end and the valve core, thereby disconnecting the fluid passage from the valve inlet via the valve core to the injection outlet.

[0006] In the technical solution of the embodiment of the present application, during the injection process, if the injection tube is not aligned with the injection port of the part to be injected, the sleeve and the injection tube are pushed toward the inside of the shell together, and a seal is formed 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, thereby improving the injection efficiency and battery quality.

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

[0008] In some embodiments, the valve core defines an internal cavity, and the inlet end of the 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, a space is provided for the movement of the injection tube therein, and a seal is formed by the cooperation between the injection tube and the surface of the internal cavity, and when the injection tube moves to a suitable position relative to the valve core, a seal can be formed, and the structure is simple.

[0009] In some embodiments, the valve core defines an internal cavity, and the inlet end of the injection tube is located in the internal cavity, and the injection valve includes a first elastic member. In the second state, the injection tube is located at a position to form a second seal between the inlet end and the 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 an internal cavity in the valve core, space is provided for the movement of the injection tube therein, and a seal is formed by the cooperation between the injection tube and the surface of the internal cavity. When the injection tube moves to a suitable position relative to the valve core, a seal can be formed, thereby reducing dripping, and the structure is simple.

[0010] In some embodiments, the injection valve includes a second elastic member, and a seal is formed between the sleeve and the housing. When the injection valve enters 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 in the area between the housing and the sleeve is lower than the air pressure outside the housing. Since the air pressure in the area between the housing and the sleeve is lower than the air pressure outside the housing, when the injection valve is lifted from the battery, for example, when the injection valve enters the second state, a negative pressure area is formed in the area, thereby providing a tendency for the surrounding liquid to flow toward the area, thereby further reducing the occurrence of electrolyte leakage.

[0011] In some embodiments, the injection valve includes a third elastic member, and the housing includes a valve body, the valve core is movably disposed in the valve body, and in the second state of the injection valve, the valve core moves 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 injection valve, the fluid can be further blocked from entering the internal cavity of the valve core through this position, thereby further improving the sealing effect of the injection valve in the second state.

[0012] In some embodiments, the inlet end of the injection tube includes a flange, the valve core includes a through hole extending from the internal cavity through the wall of the valve core, and in the second state, the flange forms a second seal on the through hole. By providing the through hole on the valve core and the flange on the injection tube, the flange is used to form a second seal on the through hole, so that the valve core has a limiting effect on the injection tube, and the injection tube has a sealing effect on the valve core.

[0013] In some embodiments, in the second state, the liquid injection outlet is sealed by the sleeve, thereby further reducing the possibility of liquid leakage.

[0014] In some embodiments, the sleeve includes an elastic rubber sleeve, and the inner wall of the through hole of the sleeve is closely fitted with the outer wall of the injection tube. By making the inner wall of the through hole of the sleeve closely fit with the outer wall of the injection tube, it is possible to reduce the droplets hanging on the outer wall of the injection tube or the inner wall of the through hole from dripping downward, thereby further improving the sealing performance of the injection valve.

[0015] In some embodiments, the injection outlet is located on the side wall of the injection tube. By arranging the injection outlet on the side wall of the injection tube, when the injection tube is retracted into the sleeve tube, the sleeve tube can play a certain blocking and sealing role on the injection outlet, thereby reducing leakage.

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

[0017] In some embodiments, the sleeve includes a chamber having an opening at the bottom of the portion of the sleeve disposed outside the housing, so that 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 that is about to leak back toward the injection source, thereby further reducing the occurrence of leakage.

[0018] In some embodiments, the opening of the chamber is arranged around the through hole. The opening of the chamber arranged around the through hole can reduce the possibility of liquid leakage from various circumferential angles of the through hole.

[0019] In some embodiments, the opening is configured to be sealed by the surface of the liquid-filled piece, thereby improving the airtightness of the chamber, so that the chamber can better maintain the internal positive air pressure.

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

[0021] In some embodiments, the injection valve further includes an air pressure sensor configured to detect the air pressure in the chamber. The air pressure sensor is used to check the air tightness of the sleeve, especially the chamber part, so that prompts can be given in time when the air tightness is insufficient and the injection can be stopped in time to avoid the danger of leakage or even spraying.

[0022] In some embodiments, the 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 to the battery to be injected due to the excessive pressure, thereby protecting the battery.

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

[0024] The second embodiment of the present application provides a liquid injection device, comprising: a liquid injection source; a liquid injection valve according to the first embodiment of the present application, the liquid injection valve is connected to the liquid injection source; and an execution structure, the execution structure is connected to the liquid injection valve, and is used to move the liquid injection valve to inject liquid into the liquid injection part. This can improve the liquid injection efficiency and improve the battery quality.

[0025] The third aspect of the present application provides a method for injecting liquid using the injection valve according to the first aspect of the present application, comprising: moving the injection valve to align the through hole of the sleeve with the injection hole of the part to be injected; pushing the injection valve toward the part to be injected so that the sleeve fits the surface of the part to be injected; and continuing to push the injection valve toward the part to be injected so that the sleeve at least partially enters the interior of the housing to expose the injection outlet of the injection tube. This can improve the injection efficiency and improve the battery quality.

[0026] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in the present application and should not be regarded as limiting the scope of the present application.

[0028] Figures 1A to 1C This is a schematic diagram of the structure of the liquid injection valve of some embodiments of the present application;

[0029] Figure 2AA cross-sectional schematic diagram of a first state of a liquid injection valve in some embodiments of the present application;

[0030] Figure 2B For some embodiments of this application Figure 2A A partial enlarged view of the injection valve shown;

[0031] Figure 3A A cross-sectional schematic diagram of a second state of a liquid injection valve in some embodiments of the present application;

[0032] Figure 3B For some embodiments of this application Figure 3A A partial enlarged view of the injection valve shown;

[0033] Figure 4A A cross-sectional schematic diagram of a liquid injection valve in some embodiments of the present application in a liquid injection state;

[0034] Figure 4B For some embodiments of this application Figure 4A A partial enlarged view of the injection valve shown;

[0035] Figure 5A A schematic diagram of the structure of a liquid injection pipe of a liquid injection valve in some embodiments of the present application;

[0036] Figure 5B For some embodiments of this application Figure 5A A schematic cross-sectional view of the injection tube shown;

[0037] Fig. 6A This is a schematic diagram of the structure of the valve core of the liquid injection valve in some embodiments of the present application;

[0038] Figure 6B For some embodiments of this application Fig. 6A A schematic cross-sectional view of the valve core shown;

[0039] Fig. 7A A schematic diagram of the structure of a sleeve of a liquid injection valve in some embodiments of the present application; and

[0040] Figure 7B For some embodiments of this application Fig. 7A A schematic cross-sectional view of the sleeve of the injection valve shown. DETAILED DESCRIPTION

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

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[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 clearly and specifically defined.

[0044] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[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, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

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

[0047] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0048] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0049] As mentioned above, the quality of the injection effect not only affects the battery performance, but also affects the battery production efficiency. In the injection process of battery production, an injection nozzle is usually used to inject electrolyte into the battery. In the related art, 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 injection hole of the battery, and then the injection valve can be opened to allow the electrolyte to be injected into the battery through the injection nozzle. However, in the injection process of the related art, 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 out of the injection nozzle may overflow outside the battery or leak, which may cause electrolyte contamination and seriously affect the battery quality and battery production efficiency.

[0050] In view of this, an embodiment of the present application provides a liquid injection valve, comprising: a housing, the housing defines a valve inlet; a valve core, the valve core is disposed in the housing; a sleeve, the sleeve is partially disposed in the housing; and a liquid injection tube, the liquid injection tube is movably disposed in the valve core and the sleeve, and comprises a liquid injection outlet and an inlet end located in the valve core. During the liquid injection process, if the liquid injection tube is not aligned with the liquid injection port of the part to be injected, the sleeve and the liquid injection tube are jointly pushed toward the inside of the housing, and a seal is formed between the inlet end and the valve core, thereby disconnecting the fluid passage from the valve inlet via the valve core to the liquid injection outlet, thereby reducing fluid overflow or leakage, thereby improving the liquid injection efficiency and battery quality.

[0051] The injection valve disclosed in the embodiment of the present application can be applied to battery production, for example, to inject electrolyte into the battery. The injection valve disclosed in the embodiment of the present application can also be applied to other scenarios where fluid injection is required, for example, it can be used to inject oil during the oil transportation process; or it can be used to inject other chemical substances.

[0052] An embodiment of the present application provides a liquid injection valve 1 . Figures 1A to 1C This is a schematic structural diagram of a liquid injection valve 1 according to some embodiments of the present application; Figure 2A AA cross-sectional schematic diagram of the first state of the liquid injection valve 1 in some embodiments of the present application;

[0053] Figure 2B For some embodiments of this application Figure 2AThe partial enlarged view of the injection valve 1 is shown. Figures 1A to 2B As shown, the injection valve 1 includes: a shell 100, which defines a valve inlet 101; a valve core 200, which is arranged in the shell 100; a sleeve 300, which is partially arranged in the shell 100; and an injection tube 400, which is movably arranged in the valve core 200 and the sleeve 300, and includes an injection outlet 401 and an inlet end 410 located in the valve core 200.

[0054] In the first state (i.e., the sleeve 300 and the injection tube 400 are pushed toward the inside of the housing 100 together) 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 through the valve core 200 to the injection outlet 401. Figure 2B In the example shown, the dashed arrows indicate that the fluid passage is broken at the seal formed between the inlet port 410 and the valve core 200 , so that the fluid cannot continue to flow out through the inlet port 410 and the injection outlet 401 .

[0055] The valve inlet 101 may be located at the upper end of the housing 100, and may serve as an inlet for fluid (eg, electrolyte) to enter the injection valve 1. The valve inlet 101 may have a connection feature, for example, the valve inlet 101 may have a connection thread or a connection buckle.

[0056] The valve core 200 may be a valve core of an integral structure, or may be a valve core composed of two or more components. For example, the valve core 200 may include an upper valve core and a lower valve core, and the upper valve core and the lower valve core may be connected by threads.

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

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

[0059] The first state may be a state in which the injection tube 400 is not aligned with the injection port of the part to be injected when the injection tube 400 and the sleeve 300 are pressed onto the part to be injected.

[0060] During the injection process, if the injection tube 400 is not aligned with the injection port of the part to be injected (such as Figure 2B As shown, the injection tube 400 is not aligned with the injection port 2 of the part to be injected, the sleeve 300 and the injection tube 400 are pushed toward the inside of the shell 100 together, 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 through the valve core 200 to the injection outlet 401, thereby reducing the overflow or leakage of the fluid from the injection valve 1, thereby improving the injection efficiency and improving the battery quality.

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

[0062] The diameter of the through hole 301 may be substantially equal to the diameter of the injection tube 400. The through hole 301 may form a clearance fit or an interference fit with the injection tube 400. Figure 2B As shown, in the first state, the injection outlet 401 is circumferentially surrounded by the through hole 301 of the sleeve 300 , and the injection outlet 401 does not extend out of the sleeve 300 , so that the 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 injection tube 400 may be different. For example, the sleeve 300 may be made of an elastic material to improve the sealing effect.

[0064] Therefore, if the injection tube 400 is not aligned with the injection port of the part to be injected (such as Figure 2B As shown in FIG. 1 , the seal between the injection outlet 401 and the through hole 301 can further reduce the leakage of the liquid retained in the injection tube 400 from the 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 a seal between the 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 reference is made to Figure 2A and Figure 2B The valve core 200 may define an internal cavity 201 , and the inlet end 410 of the injection tube 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 .

[0066] In the example, the valve core 200 may include an upper valve core and a lower valve core, and the upper valve core and the lower valve core may be disassembled and assembled with each other. For example, the upper valve core and the lower valve core may be connected by threads. Accordingly, the internal cavity 201 may be formed by the upper valve core and the lower valve core. During assembly, the injection tube 400 may be first loaded into the lower valve core, and then the lower valve core and the upper valve core may be assembled together. In the example, the valve core 200 may also be formed in one piece.

[0067] 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. The first surface may be located at the top of the valve core 200. Thus, the electrolyte in the internal cavity 201 cannot enter the injection tube 400 from the inlet end 410. In addition, a sealing ring may be provided between the inlet end 410 and the first surface to enhance the effect of the first seal.

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

[0069] Figure 3A A cross-sectional schematic diagram of a second state of a liquid injection valve in some embodiments of the present application; and Figure 3B For some embodiments of this application Figure 3A A partial enlarged view of the injection valve shown. According to some embodiments of the present application, first refer to Figure 3A and Figure 3B The valve core 200 may define an internal cavity 201, and the inlet end 410 of the injection tube 400 is located in the internal cavity 201, and the injection valve 1 may include a first elastic member 510. Figure 3A and Figure 3B In the second state shown, the injection tube 400 is located at a position where a second seal is formed between the inlet end 410 and the second surface of the inner cavity 201 of the valve core 200 under the action of the first elastic member 510, thereby disconnecting the fluid passage.

[0070] In an example, the second state may be a state in which the injection valve 1 does not work or stops injecting liquid.

[0071] The first elastic member 510 may be a spring, and one end of the first elastic member 510 may be fixed to the injection tube 400 for resetting the injection tube 400. Figure 3A and Figure 3BAs shown, the injection tube 400 is pressed downward, so that a second seal is formed between the inlet end 410 and a second surface of the internal cavity 201 of the valve core 200 (eg, a surface located at the lower part of the internal cavity 201 ).

[0072] Thus, the electrolyte can be prevented from entering the internal cavity 201, and the second seal formed between the inlet end 410 and the second surface of the internal cavity 201 of the valve core 200 prevents the electrolyte retained in the internal cavity 201 from being discharged through the injection tube 400 under pressure. In addition, a sealing ring can be provided between the inlet end 410 and the second surface to enhance the effect of the second seal.

[0073] By forming an internal cavity 201 in the valve core 200, space is provided for the movement of the injection tube 400 therein, and a seal is formed by the cooperation between the injection tube 400 and the surface of the internal cavity 201. When the injection tube 400 moves to a suitable position relative to the valve core 200, a second seal can be formed, thereby reducing dripping and having a simple structure.

[0074] According to some embodiments of the present application, continue to refer to Figure 3A The injection valve 1 may include a second elastic member 520, and a seal is formed between the sleeve 300 and the shell 100. When the injection valve 1 enters the second state, part of the sleeve 300 is pushed out of the shell 100 under the action of the second elastic member 520, so that the air pressure in the area 3 between the shell 100 and the sleeve 300 is lower than the air pressure outside the shell 100.

[0075] refer to Figure 3A , a seal is formed between the portion 302 of the sleeve 300 extending out of the housing and the housing 100. When the injection valve 1 enters the second state (for example, when entering the second state from the first state), the portion 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 may be a spring). Since the portion 302 is pushed out of the housing 100, the portion of the sleeve 300 located in the housing 100 becomes smaller, thereby increasing the volume of the cavity in the housing 100. Since a seal is formed between the portion 302 of the sleeve 300 extending out of the housing and the housing 100, the volume of the cavity increases while the amount of gas in the cavity remains substantially unchanged, resulting in the air pressure in the area 3 between the housing 100 and the sleeve 300 being lower than the air pressure outside the housing 100.

[0076] Since the air pressure in the area 3 between the shell 100 and the sleeve 300 is lower than the air pressure outside the shell 100, when the filling valve 1 is lifted from the battery, for example, a negative pressure area is formed in the area 3 during the process of the filling valve 1 entering the second state, thereby giving the surrounding liquid a tendency to flow toward the area 3, thereby further reducing the occurrence of electrolyte leakage.

[0077] According to some embodiments of the present application, continue to refer to Figure 3A The injection valve 1 may include a third elastic member 530, and the shell 100 may include a valve body 110, and the valve core 200 is movably arranged in the valve body 110. In the second state of the injection valve 1, the valve core 200 moves 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.

[0078] In an example, the valve body 110 may include an upper valve body and a lower valve body, and the upper valve body and the lower valve body may be disassembled and assembled with each other. For example, the upper valve body and the lower valve body may be connected by threads. Accordingly, the valve core 200 may be loaded into a cavity formed by the upper valve body and the lower valve body. In an example, the valve body 110 may also be formed in one piece.

[0079] The third elastic member 530 may be a spring. In addition, a sealing ring may be provided 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] Therefore, in the second state of the injection valve 1, the valve core 200 moves 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, which can further block the fluid from entering the internal cavity of the valve core 200 through this position, thereby further improving the sealing effect of the injection valve 1 in the second state.

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

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

[0083] like Figure 4A and 4BAs shown, when the injection tube 400 is roughly aligned with the injection hole 2 of the part to be injected, the injection valve 1 can be pressed downward so that the sleeve 300 of the injection valve 1 contacts the surface of the part around the injection hole of the part to be injected, and the sleeve 300 is at least partially pushed toward the inside of the housing 100 under the action of force. At this time, since the injection tube 400 is roughly aligned with the injection hole 2 of the part to be injected, the injection tube 400 is pushed into the injection hole 2 by pressing the injection valve 1 downward. In other words, the sleeve 300 can be pushed toward the inside of the housing 100 independently of the injection tube 400 to expose the injection outlet 401 of the injection tube 400.

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

[0085] Therefore, when the injection tube 400 is roughly aligned with the injection hole of the part to be injected, fast and efficient injection can be achieved.

[0086] According to some embodiments of the present application, the inlet end 410 of the injection tube 400 may include a flange, and the valve core 200 may include a through hole extending from the internal cavity through the wall of the valve core. In the second state, the flange forms a second seal on the through hole.

[0087] Figure 5A This is a schematic structural diagram of a liquid injection pipe 400 of a liquid injection valve 1 in some embodiments of the present application; Figure 5B For some embodiments of this application Figure 5A The schematic diagram of the BB section of the injection tube 400 is shown; Fig. 6A A schematic diagram of the structure of a valve core of a liquid injection valve in some embodiments of the present application; and Figure 6B For some embodiments of this application Fig. 6A Schematic diagram of CC section of the valve core shown.

[0088] like Figure 5A and Figure 5B As shown, the inlet end 410 of the injection tube 400 may include a flange 411. Fig. 6A and Figure 6B As shown, the valve core 200 may include a through hole 202 extending from the inner cavity 201 through the wall of the valve core 200, and the through hole 202 allows fluid to flow from the outer side of the wall of the valve core 200 to the inner side of the wall to enter the inner cavity 201 of the valve core 200. In the second state, the flange 411 forms a second seal on the through hole 202.

[0089] In an example, a sealing ring may be provided between the flange 411 and the outer periphery of the through hole 202 to improve the sealing performance. Figure 5BAnnular groove for sealing ring shown.

[0090] By providing a perforation on the valve core 200 and a flange on the injection tube 400 , the flange is used to form a second seal on the perforation, so that the valve core 200 limits the injection tube 400 while the injection tube 400 seals the valve core 200 .

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

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

[0093] In the example, in the second state, not only the third seal is formed between the outer surface of the valve core 200 and the inner surface of the valve body 110, but also a seal is formed between the 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 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] Thereby, the possibility of liquid leakage can be further reduced.

[0095] According to some embodiments of the present application, the sleeve 300 may include 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 injection tube 400.

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

[0097] By making the inner wall of the through hole 301 of the sleeve 300 fit tightly with the outer wall of the injection tube 400, it is possible to reduce the downward dripping of droplets hanging on the outer wall of the injection tube 400 or the inner wall of the through hole 301, thereby further improving the sealing performance of the injection valve 1.

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

[0099] refer to Figure 5A and Figure 5B , a plurality of injection outlets 401 may be provided on the side wall of the injection tube 400 .

[0100] By arranging the injection outlet 401 on the side wall of the injection tube 400, when the injection tube 400 is retracted into the sleeve 300, the sleeve 300 can play a certain blocking and sealing role on the injection outlet 401, thereby reducing leakage.

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

[0102] refer to Fig. 7A and Figure 7B ,in, Fig. 7A It is a structural schematic diagram of the sleeve 300 of the liquid injection valve 1 in some embodiments of the present application; Figure 7B For some embodiments of this application Fig. 7A A schematic cross-sectional view of a sleeve 300 of a liquid injection valve 1 is shown.

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

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

[0105] In an example, gas may be provided in the chamber 311 to make the gas pressure in the chamber 311 greater than the gas pressure of the surrounding environment, or to make the gas pressure in the chamber 311 greater than the gas pressure in the injection source (eg, injection cup).

[0106] In an example, the gas pressure in the chamber 311 may be maintained above 0.3 MPa.

[0107] Thus, when, for example, a sealing problem occurs at the sleeve 300, the positive air pressure in the chamber 311 of the sleeve 300 can press the leaking fluid back toward the injection source (eg, the injection cup), thereby further reducing the occurrence of leakage.

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

[0109] The opening of the chamber 311 can be arranged to maintain a certain gap with the through hole 301, and the size of the opening of the chamber 311 can be set according to the diameter of the injection port and / or the injection port sink of the part to be injected (such as a battery).

[0110] The opening of the chamber 311 arranged around the through hole 301 can reduce the possibility of liquid leakage from various angles in the circumferential direction of the through hole 301 .

[0111] According to some embodiments of the present application, the opening of the chamber 311 may be configured to be sealed by the surface of the part to be filled with liquid.

[0112] For example, when the part to be injected 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 part to be injected, so that the opening of the chamber 311 can be sealed by the surface of the part to be injected.

[0113] For example, when the part to be injected 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 part to be injected, thereby allowing the opening of the chamber 311 to be sealed by the surface of the part to be injected.

[0114] Thereby, the airtightness 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, continue to refer to Figure 2A , Figure 3A or Figure 4A The housing 100 may include a sleeve housing 600, in which the sleeve 300 is partially disposed, and the sleeve housing 600 can move following the sleeve 300. Figure 7B The sleeve 300 includes a first passage 312 in fluid communication with the chamber 311, and the sleeve shell 600 may include a second passage (not shown in the figure) in fluid communication with the first passage 312, and the second passage may have a gas supply interface.

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

[0117] By setting a second passage in fluid communication with the first passage 312 of the sleeve 300 in the sleeve shell 600 and providing an air supply interface, the chamber 311 of the sleeve 300 is continuously supplied with air to maintain a positive air pressure in the chamber 311 while the sleeve shell 600 moves following the sleeve 300 .

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

[0119] In an example, a probe of an air pressure sensor may be disposed in the chamber 311 to detect the air pressure in the chamber 311. For example, a piezo-resistance type or an electrostatic capacitance type air pressure sensor may be used, which will not be described in detail herein.

[0120] The air pressure sensor is used to check the air tightness of the sleeve 300, especially the chamber 311, so that prompts can be given in time when the air tightness is insufficient and the injection can be stopped in time to avoid the danger of leakage or even spraying.

[0121] According to some embodiments of the present application, the injection valve 1 may further include a fourth elastic member and a valve mounting seat, and the shell is floatably connected to the valve mounting seat via the fourth elastic member.

[0122] refer to Figure 2A The injection valve 1 may further include a fourth elastic member 540 and a valve mounting seat 700 , and the housing 100 is floatably connected to the valve mounting seat 700 via the fourth elastic member 540 .

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

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

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

[0126] refer to Figure 1A The injection valve 1 may further include a quick-release connector 800, which is connected to the housing 100 and is used to connect the valve inlet 101 to the injection source. The quick-release connector 800 may be a docking buckle or a magnetic connector.

[0127] Therefore, the injection valve 1 can be quickly matched with different injection machines.

[0128] An embodiment of the second aspect of the present application provides an injection device, comprising: an injection source; an injection valve 1 according to the first aspect of the present application, the injection valve 1 is connected to the injection source; and an execution structure, the execution structure is connected to the injection valve, and is used to move the injection valve to inject liquid into the part to be injected.

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

[0130] During the injection process, if the injection tube 400 is not aligned with the injection port of the part to be injected (such as Figure 2B As shown, the injection tube 400 is not aligned with the injection port 2 of the part to be injected, the sleeve 300 and the injection tube 400 are pushed toward the inside of the shell 100 together, 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 through the valve core 200 to the injection outlet 401, thereby reducing the overflow or leakage of the fluid from the injection valve 1, thereby improving the injection efficiency and improving the battery quality.

[0131] An embodiment of the third aspect of the present application provides a method for injecting liquid using the injection valve 1 according to the first aspect of the present application, comprising: moving the injection valve 1 to align the through hole 301 of the sleeve 300 with the injection hole of the part to be injected; pushing the injection valve 1 toward the part to be injected so that the sleeve 300 fits with the surface of the part to be injected; and continuing to push the injection valve 1 toward the part to be injected so that the sleeve 300 at least partially enters the interior of the shell to expose the injection outlet 401 of the injection tube 400.

[0132] This can reduce the overflow or leakage of fluid from the injection valve 1, thereby improving the injection efficiency and the battery quality.

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

[0134] like Figures 1A to 7B As shown, the injection valve 1 includes: a housing 100, the housing 100 defines a valve inlet 101; a valve core 200, the valve core 200 is disposed in the housing 100 and defines an internal cavity 201; a sleeve 300, the sleeve 300 is partially disposed in the housing 100, and the sleeve 300 may include a through hole 301; and an injection tube 400, the injection tube 400 is movably disposed in the through hole 301 of the valve core 200 and the sleeve 300, and includes an injection outlet 401 and an inlet end 410 located in the internal cavity 201 of the valve core 200, and the injection outlet 401 may be located on the side wall of the injection tube 400.

[0135] In the first state (i.e., the sleeve 300 and the injection tube 400 are pushed toward the inside of the housing 100 together) 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 through the valve core 200 to the injection outlet 401. Figure 2BIn the example shown, 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 through the inlet end 410 and the injection outlet 401. In addition, in the first state, the injection outlet 401 is tightly fitted by the inner wall of the through hole 301 of the sleeve (elastic rubber 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 valve core 200.

[0136] refer to Figure 3A and Figure 3B , the injection valve 1 includes a first elastic member 510. Figure 3A and Figure 3B In the second state shown, the injection tube 400 is located at a position where a second seal is formed between the inlet end 410 and the second surface of the internal cavity 201 of the valve core 200 under the action of the first elastic member 510, thereby disconnecting the fluid passage. The inlet end 410 of the injection tube 400 includes a flange, and the valve core 200 includes a perforation extending from the internal cavity through the wall of the valve core. In the second state, the flange forms a second seal on the perforation. The injection valve 1 includes a second elastic member 520, and a seal is formed between the sleeve 300 and the housing 100. During the process of the injection valve 1 entering the second state, a portion 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 area 3 between the housing 100 and the sleeve 300 is less than the air pressure outside the housing 100. In addition, the injection valve 1 includes a third elastic member 530, and the housing 100 may include a valve body 110, and the valve core 200 is movably disposed in the valve body 110. In the second state of the injection valve 1, the valve core 200 moves 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. In addition, in the second state, the injection outlet 401 may be sealed by the sleeve 300.

[0137] like Figure 4A and Figure 4B As shown, the sleeve 300 can be pushed toward the inside of the housing 100 independently of the injection tube 400 to expose the injection outlet 401 of the injection tube 400 and cause the valve core 200 to move relative to the injection tube 400 to open a fluid passage from the valve inlet 101 to the injection outlet 401 via the valve core 200 .

[0138] In addition, the sleeve 300 may include a chamber 311 having an opening at the bottom of the portion 302 of the sleeve 300 disposed outside the housing. The opening of the chamber 311 is disposed around the through hole 301, and the opening of the chamber 311 is configured to be sealed by the surface of the part to be injected.

[0139] The housing 100 includes a sleeve housing 600, in which the sleeve 300 is partially disposed, and the sleeve housing 600 can move following the sleeve 300. Figure 7B The sleeve 300 includes a first passage 312 in fluid communication with the chamber 311, and the sleeve shell 600 may include a second passage in fluid communication with the first passage 312, and the second passage may have an air supply interface. The injection valve 1 also includes an air pressure sensor, which is configured to detect the air pressure in the chamber 311. The injection valve 1 also includes a fourth elastic member and a valve mounting seat, and the housing is floatably connected to the valve mounting seat through the fourth elastic member. The injection valve 1 also includes a quick-release connector, which is connected to the housing and is used to connect the valve inlet to the injection source.

[0140] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A liquid injection valve (1), characterized in that: include: a housing (100), the housing (100) defining a valve inlet (101); A valve core (200), wherein the valve core (200) is arranged in the housing (100); a sleeve (300), wherein the sleeve (300) is partially disposed in the housing (100); and a liquid injection pipe (400), the liquid injection pipe (400) being 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), In the first state where the sleeve (300) and the injection tube (400) are jointly pushed toward the interior of the housing (100), a seal is formed between the inlet end (410) and the valve core (200), thereby disconnecting the fluid passage from the valve inlet (101) through the valve core (200) to the injection outlet (401).

2. The liquid injection valve (1) according to claim 1, characterized in that: The sleeve (300) comprises a through hole (301), and the injection tube (400) is at least partially disposed in the through hole (301), and in the first state, the injection outlet (401) is sealed by the inner wall of the through hole (301).

3. The liquid injection 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 injection tube (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).

4. The liquid injection 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 injection tube (400) is located in the internal cavity (201), and the injection valve (1) includes a first elastic member (510), In the second state, the injection tube (400) is located at a second sealing position between the inlet end (410) and the second surface of the internal cavity (201) of the valve core (200) under the action of the first elastic member (510), thereby disconnecting the fluid passage.

5. The liquid injection valve (1) according to claim 4, characterized in that: The injection valve (1) comprises a second elastic member (520), and a seal is formed between the sleeve (300) and the shell (100). When the injection valve (1) enters the second state, part of the sleeve (300) is pushed out of the shell (100) under the action of the second elastic member (520), so that the air pressure in the area between the shell (100) and the sleeve (300) is lower than the air pressure outside the shell (100).

6. The liquid injection valve (1) according to claim 4, characterized in that: The injection valve (1) includes a third elastic member (530), and the housing (100) includes a valve body (110), and the valve core (200) is movably arranged in the valve body (110), wherein, in the second state of the injection valve (1), the valve core (200) moves 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 injection valve (1) according to claim 4, characterized in that: The inlet end (410) of the injection tube (400) includes a flange (411), and the valve core (200) includes a through hole (202) extending from the internal cavity (201) through the wall of the valve core (200), and in the second state, the flange (411) forms the second seal on the through hole (202).

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

9. The liquid injection valve (1) according to any one of claims 2 to 8, 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 injection tube (400).

10. The liquid filling valve (1) according to any one of claims 1 to 8, 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 any one of claims 1 to 8, characterized in that: The sleeve (300) can be pushed toward the inside of the housing (100) independently of the injection tube (400) to expose the injection outlet (401) of the injection tube (400) and cause the valve core (200) to move relative to the injection tube (400) to open the fluid passage.

12. The liquid filling valve (1) according to any one of claims 1 to 11, characterized in that: The sleeve (300) includes a chamber (311) having an opening at the bottom of a portion (310) of the sleeve (300) disposed outside the housing (100).

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

14. The liquid injection valve (1) according to claim 12 or 13, characterized in that: The opening is configured to be sealed by a surface of the object to be filled.

15. The liquid injection valve (1) according to claim 12 or 13, characterized in that: The housing (100) includes a sleeve shell (600), the sleeve (300) is partially disposed in the sleeve shell (600), and the sleeve shell (600) is capable of moving following the sleeve (300), the sleeve (300) includes a first passage (312) fluidically connected to the chamber (311), and the sleeve shell (600) includes a second passage (102) fluidically connected to the first passage (312), and the second passage (102) has a gas supply interface.

16. The liquid injection valve (1) according to claim 12 or 13, characterized in that: The injection valve (1) further comprises an air pressure sensor, which is configured to detect the air pressure in the chamber (311).

17. The liquid filling valve (1) according to any one of claims 1 to 16, characterized in that: The injection valve (1) further comprises a fourth elastic member (540) and a valve mounting seat (700), and the housing (100) is connected to the valve mounting seat (700) in a floating manner via the fourth elastic member (540).

18. The liquid filling valve (1) according to any one of claims 1 to 16, characterized in that: The liquid injection valve (1) further comprises a quick-release connector (800), wherein the quick-release connector (800) is connected to the housing (100) and is used to connect the valve inlet (101) to a liquid injection source.

19. A liquid injection device, characterized in that: include: Injection source; The liquid injection valve (1) according to any one of claims 1 to 18, wherein the liquid injection valve (1) is connected to the liquid injection source; and An execution structure is connected to the injection valve (1) and is used to move the injection valve (1) to inject liquid into the part to be injected.

20. A method for liquid injection using the liquid injection valve (1) according to any one of claims 1 to 18, characterized in that: include: Moving the injection valve (1) so that the through hole (301) of the sleeve (300) is aligned with the injection hole of the part to be injected; Pushing the injection valve (1) to move toward the part to be injected with liquid, so that the sleeve (300) fits the surface of the part to be injected with liquid; and The injection valve (1) is continuously pushed to move toward the part to be injected, so that the sleeve (300) at least partially enters the interior of the housing (100) to expose the injection outlet (401) of the injection tube (400).

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