Liquid injection nozzle and liquid injection device having the same

Abstract

The embodiment of the present application provides a liquid injection nozzle and a liquid injection device having the same, wherein the liquid injection nozzle includes a body, a liquid injection tube and a baffle. The body has a channel arranged along the height direction of the liquid injection nozzle, and a first outlet is provided at the lower part of the channel. The liquid injection tube is arranged in the channel in a manner of reciprocating motion along the height direction. The baffle is connected to the body and is configured to cover the first outlet when the lower end of the liquid injection tube is higher than the first outlet, and to be pushed away by the liquid injection tube when the lower end of the liquid injection tube is lower than the first outlet. The liquid injection nozzle provided in the embodiment of the present application can block the residual liquid dripping from the lower end of the liquid injection tube, thereby reducing the impact of the residual liquid on the external environment and other objects to reduce pollution, and the liquid to be injected is transported by the movable liquid injection tube, which can also prevent the liquid to be injected from adhering to the inner wall of the body. In particular, for corrosive liquid to be injected, the liquid injection tube can be replaced with an injection tube of suitable material, and the liquid injection nozzle is more versatile and maintainable.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a liquid injection nozzle and a liquid injection device having the same. Background Art

[0002] This section merely provides background information related to the present application and is not necessarily prior art.

[0003] During battery production, electrolyte needs to be injected into the battery cell housing as a conductive medium. Generally speaking, an opening for liquid injection is provided at one end of the battery cell housing. During the electrolyte infusion process, an injection pump draws electrolyte through an injection nozzle from this opening and injects it into the interior of the battery cell, and then the opening is sealed. However, when liquid is currently injected using the injection nozzle in related technologies, residual electrolyte easily adheres to the rubber inner wall of the injection nozzle. The residual electrolyte forms crystals and causes electrolyte contamination. Therefore, how to reduce the contamination of residual liquid is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0004] The purpose of the embodiments of the present application is to provide a liquid injection nozzle and a liquid injection device having the same to reduce contamination of residual liquid. The specific technical solution is as follows:

[0005] An embodiment of the first aspect of the present application provides a liquid injection nozzle, comprising a body, a liquid injection tube, and a baffle. The body has a channel arranged along the height direction of the liquid injection nozzle, and a first outlet is provided at the lower portion of the channel. The liquid injection tube is arranged to pass through the channel in a manner that reciprocates along the height direction. The baffle is connected to the body and is configured to cover the first outlet when the lower end of the liquid injection tube is higher than the first outlet, and to be pushed away by the liquid injection tube when the lower end of the liquid injection tube is lower than the first outlet.

[0006] According to the embodiment of the first aspect of the present application, the injection nozzle provided by the embodiment has an injection tube that can reciprocate along the height direction of the injection nozzle in the channel provided in the body thereof. The lower part of the channel is provided with a first outlet, and the baffle is connected to the body and is configured to cover the first outlet when the lower end of the injection tube is higher than the first outlet, and to be pushed open by the injection tube when the lower end of the injection tube is lower than the first outlet. In this way, when liquid injection is required, the first outlet of the injection nozzle is aligned with the injection port of the cavity to be injected, and the injection tube can be moved to push the baffle open, so that the lower end of the injection tube passes from the first outlet to the outside of the body, that is, extends to the injection port of the cavity to be injected. The liquid to be injected is transported from the upper end of the injection tube to the lower end of the injection tube to enter the cavity to be injected to achieve injection. After the injection is completed, the injection tube is moved back so that its lower end is restored to be above the first outlet. At this time, the baffle covers the first outlet, which can block the residual liquid dripping from the lower end of the injection tube, thereby reducing the impact of the residual liquid on the external environment and other objects and reducing pollution. Moreover, by transporting the liquid to be injected through the movable injection tube, the liquid to be injected can be prevented from adhering to the inner wall of the main body. Especially for corrosive liquid to be injected, the injection tube can be replaced with an injection tube of suitable material, and the versatility and maintainability of the injection nozzle are stronger.

[0007] In some embodiments of the present application, the injection nozzle further includes a spring, which is disposed between the injection tube and the main body along the axis of the injection tube and is configured to generate elastic deformation when the injection tube moves downward relative to the main body. By disposing the spring between the injection tube and the main body along the axis of the injection tube, when injection is required, force is applied to the injection tube so that the injection tube overcomes the elastic force of the spring and moves downward and pushes away the baffle. At this time, the lower end of the injection tube extends from the first outlet to the injection port of the cavity to be injected to achieve injection. After the injection is completed, the force applied to the injection tube is canceled, and the spring returns to its original state under the action of its own elasticity, while driving the injection tube to move upward to achieve automatic resetting of the injection tube, making the operation of the injection process simpler, and the faster resetting of the injection tube can also better reduce the risk of residual liquid accumulated at the lower end of the injection tube dripping onto other objects.

[0008] In some embodiments of the present application, the injection nozzle further includes a first extension portion connected to the injection tube, the first extension portion extending outwardly from the tube wall of the injection tube along the diameter of the injection tube, and the first extension portion being connected to one end of the spring. By providing the first extension portion extending outwardly from the tube wall of the injection tube along the diameter of the injection tube and connected to one end of the spring, and the first extension portion being perpendicular to the axis of the injection tube, installation of the spring is facilitated, so that the spring is disposed between the injection tube and the body along the axis of the injection tube. Furthermore, during downward movement of the injection tube relative to the body, the first extension portion can exert pressure or tension on the spring connected thereto, causing the spring to elastically deform.

[0009] In some embodiments of the present application, the injection nozzle further comprises a fixing seat disposed opposite the first extension, the fixing seat being fixed to the body and connected to the other end of the spring. By disposing the fixing seat opposite the first extension, the other end of the spring is connected to the fixing seat. Since the fixing seat is fixed to the body and cannot move, when force is applied to the injection tube to cause the injection tube to move downward, the first extension drives one end of the spring connected thereto to move toward (or away from) the fixing seat, thereby compressing (or stretching) the spring and causing it to elastically deform. For example, if the fixing seat is disposed directly below and opposite the first extension, when the injection tube moves downward, the first extension exerts pressure on the spring, causing the spring to be compressed between the first extension and the fixing seat. When the external force is removed, one end of the spring rebounds upward against the first extension, causing the injection tube to move upward and return to its initial position. This initial position can be understood as the position of the injection tube when the spring is in its original state (not elastically deformed) or not driven by an external force.

[0010] In some embodiments of the present application, the injection nozzle further includes a second extension, one end of the second extension being connected to the first extension, and the other end of the second extension being configured to abut against the fixing seat after the injection tube moves downward a preset distance. The provision of the second extension can fix the distance the injection tube moves downward. When the other end of the second extension abuts against the fixing seat, the position of the lower end of the injection tube extending toward the injection port after the baffle is pushed open is fixed, thereby preventing the portion of the injection tube extending toward the injection port from being too long, which could cause the outer wall of the injection tube to contact the liquid to be injected or the injection port.

[0011] In some embodiments of the present application, the injection nozzle further includes a stopper disposed within the body and configured to contact the wall of the injection tube and / or the sidewall of the second extension. By disposing the stopper within the body, which contacts the wall of the injection tube and / or the sidewall of the second extension, the smoothness of the reciprocating motion of the injection tube along the height direction of the injection nozzle can be improved, thereby preventing the lower end of the injection tube from scraping against the sidewall of the injection port due to its own deflection after extending toward the injection port.

[0012] In some embodiments of the present application, the limiting cylinder is further configured to contact the first extension portion. By setting the limiting cylinder to contact the first extension portion, the injection tube can be better able to automatically return to the initial position and stop after the external force applied to the injection tube is removed.

[0013] In some embodiments of the present application, a baffle is detachably connected between the body and the fixing base. Because the baffle is used to block residual liquid dripping from the lower end of the injection tube, its surface is often in contact with and adheres to residual liquid. In particular, the baffle is easily damaged by corrosive liquids. Therefore, by detachably connecting the baffle between the body and the fixing base, it is easier to clean, maintain, and replace the baffle.

[0014] In some embodiments of the present application, the baffle includes a fixing ring having a plurality of first through holes and a plurality of fan-shaped elastic sheets. The arcuate edges of the plurality of fan-shaped elastic sheets are embedded in the fixing ring and connected to the fixing ring via bolts passing through the first through holes. The bolts are also passed through the body and the fixing seat. By providing the fixing ring and the plurality of fan-shaped elastic sheets, on the one hand, it is easier to fix the baffle to a position on the body that covers the first outlet. On the other hand, it also allows the fan-shaped elastic sheets of the baffle to automatically return to their original state when the lower end of the injection tube moves upward to a position higher than the first outlet. This allows the injection tube to return to its original position after injection is completed, and the baffle to return to a position covering the first outlet to block residual liquid dripping from the injection tube.

[0015] In some embodiments of the present application, the injection tube is provided with a flow guide portion, the diameter of which gradually decreases from the upper end of the injection tube to the lower end of the injection tube. By providing a flow guide portion with a gradually decreasing diameter from the upper end of the injection tube to the lower end of the injection tube, the liquid to be injected in the injection tube can flow from top to bottom to the flow guide portion, and then be concentrated into a thinner liquid column to enter the injection port, thereby better preventing the injected liquid from splashing onto other components and objects.

[0016] In some embodiments of the present application, the baffle is provided with an inclined surface adapted to the guide portion. By providing the inclined surface adapted to the guide portion, when the injection tube moves downward, it helps the injection tube and the baffle to achieve interference fit and makes it easier to push the baffle away.

[0017] An embodiment of the second aspect of the present application provides a liquid injection device, comprising a liquid injection nozzle provided according to the embodiment of the first aspect of the present application.

[0018] When the bottle is in the liquid injection state, the bottle cap is turned to the left of the bottle cap and the bottle cap is turned to the right of the bottle cap, so that the bottle cap is turned to the left of the bottle cap and the bottle cap is turned to the right of the bottle cap. When the bottle cap is in the liquid injection state, the bottle cap is turned to the right of the bottle cap, so that the bottle cap is turned to the right of the bottle cap. When the bottle cap is in the liquid injection state, the bottle cap is turned to the right of the bottle cap, so that the bottle cap is turned to the right of the bottle cap Moreover, by transporting the liquid to be injected through the movable injection tube, the liquid to be injected can be prevented from adhering to the inner wall of the main body. Especially for corrosive liquid to be injected, the injection tube can be replaced with an injection tube of suitable material, and the versatility and maintainability of the injection nozzle are stronger.

[0019] In some embodiments of the present application, the liquid injection device further includes a liquid injection cup, a driving mechanism, and a liquid blocking rod. The liquid injection cup includes a cavity for accommodating electrolyte, an upper cover arranged at one end of the cavity, and a lower cover arranged at the other end of the cavity, the lower cover is provided with a second through hole, the liquid injection tube of the liquid injection nozzle is fixedly provided through the second through hole and communicated with the cavity, and the upper cover is provided with a third through hole. The driving mechanism is used to drive the liquid injection cup to move from the first position to the second position. The liquid blocking rod is fixed in position and is provided through the third through hole, and one end of the liquid blocking rod is configured to tightly abut against the upper end of the liquid injection tube and to detach from the liquid injection tube when the liquid injection cup reaches the second position.

[0020] By setting up a liquid injection cup, a driving mechanism, and a liquid blocking rod, when the driving mechanism does not drive the liquid injection cup, the liquid blocking rod tightly abuts the upper end of the liquid injection tube, so that the liquid to be injected in the cavity of the liquid injection cup cannot flow into the liquid injection tube; when the driving mechanism drives the liquid injection cup to make the liquid injection cup reach the second position, the liquid injection cup also drives the liquid injection tube fixedly provided on its lower cover to move downward until its lower end reaches the ideal position. At this time, the liquid blocking rod is separated from the liquid injection tube, and the liquid injection tube is connected with the cavity, and the liquid to be injected flows downward from the upper end of the liquid injection tube to its lower end, thereby entering the liquid injection port to realize liquid injection. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0022] Figure 1 A schematic structural diagram of a liquid injection nozzle provided in an embodiment of the present application;

[0023] Figure 2 Another structural schematic diagram of the liquid injection nozzle provided in an embodiment of the present application;

[0024] Figure 3 A top view and a front cross-sectional view of a baffle provided in an embodiment of the present application;

[0025] Figure 4 A schematic structural diagram of a liquid injection device provided in an embodiment of the present application.

[0026] The accompanying drawings in the specific implementation manner are as follows:

[0027] 10-liquid injection nozzle; 11-body; 12-liquid injection pipe; 13-baffle;

[0028] 14-fixed seat; 15-limiting cylinder; 16-spring;

[0029] 121-first extension portion; 122-second extension portion; 123-flow guide portion;

[0030] 131 - fixing ring; 1311 - first through hole; 132 - fan-shaped elastic piece; 1301 - inclined surface;

[0031] 151-first limiting portion; 152-second limiting portion;

[0032] 20-liquid filling cup; 21-cavity; 22-upper cover; 23-lower cover;

[0033] 30- fluid resistance rod;

[0034] 500-Injection port. DETAILED DESCRIPTION

[0035] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art 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" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0037] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0038] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0039] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0040] 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).

[0041] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "height", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and 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 device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0042] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0043] The battery mentioned in the embodiments of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. In a battery, there can be multiple battery cells, and the multiple battery cells can be connected in series, in parallel, or in mixed connection. Mixed connection means that multiple battery cells are connected in series and in parallel. Multiple battery cells can be directly connected in series, in parallel, or in mixed connection, and then the whole composed of multiple battery cells is accommodated in a box; of course, the battery can also be a battery module formed by connecting multiple battery cells in series, in parallel, or in mixed connection, and then the multiple battery modules are connected in series, in parallel, or in mixed connection to form a whole, and accommodated in a box. The battery may also include other structures. For example, the battery may also include a busbar component for realizing electrical connection between multiple battery cells. For example, the battery mentioned in the present application may include a battery module or a battery pack.

[0044] Each battery cell can be a secondary battery or a primary battery, and can also be a lithium-ion battery, a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell can be cylindrical, flat, rectangular, or in other shapes.

[0045] A battery cell is the smallest unit that makes up a battery. It includes end caps, a housing, a cell assembly, and other functional components. A battery cell housing can contain one or more cell assemblies.

[0046] An end cap is a component that fits over the opening of the housing to isolate the internal environment of the battery cell from the external environment. The shape of the end cap can be adapted to the shape of the housing to fit the housing. Optionally, the end cap can be made of a material with a certain hardness and strength (such as an aluminum alloy). This prevents the end cap from deforming when squeezed or impacted, giving the battery cell greater structural strength and improved safety. The end cap can be provided with functional components such as electrode terminals. The electrode terminals can be used to electrically connect to the battery cell assembly for outputting or inputting electrical energy into or out of the battery cell. In some embodiments, the end cap can also be provided with a pressure relief mechanism for relieving internal pressure when the internal pressure or temperature of the battery cell reaches a threshold. The end cap can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this is not particularly limited in the embodiments of the present application. In some embodiments, an insulating member can be provided on the inside of the end cap to isolate the electrical connection components within the housing from the end cap to reduce the risk of short circuits. Exemplary insulating members can be plastic, rubber, etc.

[0047] The shell is a component used to cooperate with the end cover to form the internal environment of the battery cell, wherein the formed internal environment can be used to accommodate the battery cell assembly, electrolyte and other components. The shell and the end cover can be independent components, and an opening can be set on the shell, and the internal environment of the battery cell is formed by covering the opening with the end cover at the opening. Without limitation, the end cover and the shell can also be integrated. Specifically, the end cover and the shell can form a common connection surface before other components are put into the shell, and when the interior of the shell needs to be encapsulated, the end cover is covered with the shell. The shell can be of various shapes and sizes, such as rectangular, cylindrical, hexagonal, etc. Specifically, the shape of the shell can be determined according to the specific shape and size of the battery cell assembly. The material of the shell can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose any special restrictions on this.

[0048] The cell assembly is the component in the battery cell where the electrochemical reaction occurs. One or more cell assemblies may be contained in the shell. The cell assembly is mainly formed by winding or stacking the positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body of the cell assembly, and the parts of the positive and negative electrode sheets without active materials each constitute the tabs. The positive and negative electrode tabs may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery, the positive and negative electrode active materials react with the electrolyte, and the tabs connect the electrode terminals to form a current loop.

[0049] Battery cells can be cylindrical, flat, rectangular, or other shapes, and are not specifically limited in the embodiments of this application. Battery cells are generally divided into three types based on packaging: cylindrical, prismatic, and soft-pack. This embodiment of this application does not limit this. The battery cells in the embodiments of this application can be used, but are not limited to, in electrical devices such as vehicles, ships, and aircraft.

[0050] During the battery production process, electrolyte needs to be injected into the shell of the battery cell as a conductive medium. Generally speaking, an opening for liquid injection is provided at one end of the battery cell shell. During the electrolyte infusion process, an injection pump draws electrolyte through the injection nozzle from the opening and injects it into the interior of the battery cell, and then the opening is sealed. However, when liquid is currently injected using the injection nozzle in the related art, residual electrolyte is easily attached to the rubber inner wall of the injection nozzle. The residual electrolyte forms crystals, which causes electrolyte contamination. After the injection is stopped, the residual electrolyte in the injection nozzle accumulates toward the opening at the end of the injection nozzle under the action of its own gravity. When the gravity of the accumulated electrolyte is greater than the adsorption force of the inner wall of the injection nozzle on the electrolyte, the electrolyte will drip, causing the electrolyte to adhere to the surface of the battery cell, thereby damaging the battery cell and even causing cross-contamination of other battery cells, causing more battery cells to be scrapped and increasing the battery defect rate.

[0051] Based on the above considerations, in order to solve the problem of residual electrolyte contamination, the inventors have conducted in-depth research and proposed a liquid injection nozzle, the inner cavity of which is provided with a movable liquid injection tube to realize the transportation of electrolyte, and a baffle including an elastic member is provided at the outlet of the liquid injection nozzle, which covers the outlet of the liquid injection nozzle. When liquid injection is required, the liquid injection tube is moved so that it pushes the baffle away and extends to the liquid injection port opened on the shell of the battery cell. After the liquid injection is completed, the liquid injection tube is moved back to reset it, and the baffle automatically returns to the state of covering the outlet of the liquid injection nozzle under the elastic force of its elastic member. By designing a movable liquid injection tube, on the one hand, it is possible to prevent the electrolyte from adhering to the inner wall of the liquid injection nozzle body, thereby reducing the formation of electrolyte crystals and reducing electrolyte contamination. On the other hand, after the liquid injection is completed, the residual liquid accumulated at the end of the liquid injection tube can be blocked by the baffle covering the outlet of the liquid injection nozzle after dripping, thereby reducing the risk of residual liquid corroding other objects.

[0052] The liquid injection nozzle disclosed in the embodiment of the present application can be used in any scenario where liquid needs to be transported, especially when transporting harmful liquids (such as some toxic, corrosive, reactive, or polluting liquids). The application of the liquid injection nozzle disclosed in the embodiment of the present application can reduce the risk of harmful liquids contacting other components or other objects, thereby making production more standardized and improving product yield.

[0053] In view of this, if Figures 1 to 3As shown, an embodiment of the first aspect of the present application provides a liquid injection nozzle 10, comprising a body 11, a liquid injection tube 12, and a baffle 13. The body 11 has a channel arranged along the height direction of the liquid injection nozzle 10, with a first outlet provided at the lower portion of the channel; the liquid injection tube 12 is arranged to pass through the channel in a manner that reciprocates along the height direction; the baffle 13 is connected to the body 11 and is configured to cover the first outlet when the lower end of the liquid injection tube 12 is higher than the first outlet, and to be pushed away by the liquid injection tube 12 when the lower end of the liquid injection tube 12 is lower than the first outlet.

[0054] The liquid injection nozzle 10 is a device that is compatible with the liquid injection port 500 of the cavity to be injected and is used to transport the liquid to be injected to the liquid injection port 500. For example, in the embodiment of the present application, the cavity to be injected can be a cavity formed by the shell of the battery cell, and the liquid to be injected is an electrolyte suitable for the battery cell. For example, if the battery cell is a lithium-ion battery, the main solvent of the electrolyte is ethylene carbonate, dimethyl carbonate, ethyl methyl carbonate, and diethyl carbonate; if the battery cell is a lithium-manganese primary battery, the main solvent of the electrolyte is propylene carbonate, ethylene glycol dimethyl ether, etc. The liquid injection port 500 can be understood as an opening opened on the shell of the battery cell for the liquid to be injected to enter the cavity to be injected.

[0055] The body 11 can be understood as a shell with a hollow space formed in the liquid injection nozzle 10, which is used to accommodate or connect and install other components in the liquid injection nozzle 10.

[0056] The channel may be understood as a portion of the hollow space formed by the body 11 that extends to both ends of the body 11 in the height direction.

[0057] The first outlet can be understood as an opening located at the lower part of the channel that can lead to the outside of the main body 11. The structural shape and size of the first outlet can be the same as or different from the structural shape and size of the channel. This application does not impose any special restrictions on this, but at least the size of the first outlet must be greater than or equal to the size of the channel so that the injection tube 12 passing through the channel can pass smoothly through the first outlet.

[0058] The injection tube 12 can be understood as a hollow cylindrical structure, with both ends extending along the height direction of the injection nozzle 10 being connected. In the embodiment of the present application, the injection tube 12 can transport the liquid to be injected from its upper end to its lower end.

[0059] According to the embodiment of the first aspect of the present application, the injection nozzle 10 provided by the embodiment has an injection tube 12 that can reciprocate in the height direction of the injection nozzle 10 in the channel provided in the body 11. A first outlet is provided at the lower part of the channel, and a baffle 13 is connected to the body 11 and is configured to cover the first outlet when the lower end of the injection tube 12 is higher than the first outlet, and to be pushed away by the injection tube 12 when the lower end of the injection tube 12 is lower than the first outlet. In this way, when liquid injection is required, the first outlet of the injection nozzle 10 is aligned with the injection port 500 of the cavity to be injected, and the baffle 13 is moved to the bottom of the channel. The movable injection tube 12 pushes against the baffle 13, so that the lower end of the injection tube 12 can pass from the first outlet to the outside of the main body 11, that is, extend to the injection port 500 of the liquid cavity to be injected. The liquid to be injected is transported from the upper end of the injection tube 12 to the lower end of the injection tube 12 to enter the liquid cavity to be injected to achieve injection. After the injection is completed, the injection tube 12 is moved back so that its lower end is restored to the top of the first outlet. At this time, the baffle 13 covers the first outlet, which can block the residual liquid dripping from the lower end of the injection tube 12, thereby reducing the impact of the residual liquid on the external environment and other objects and reducing pollution. Moreover, by transporting the liquid to be injected through the movable injection tube 12, the liquid to be injected can be prevented from adhering to the inner wall of the main body 11. In particular, for corrosive liquid to be injected, the liquid to be injected can be replaced by replacing the injection tube 12 with a suitable material. The versatility and maintainability of the injection nozzle 10 are enhanced.

[0060] In some embodiments of the present application, Figure 1 and Figure 2 As shown, the injection nozzle 10 further includes a spring 16 , which is disposed between the injection tube 12 and the body 11 along the axial direction of the injection tube 12 and configured to generate elastic deformation when the injection tube 12 moves downward relative to the body 11 .

[0061] The spring 16 is a part made of an elastic material (such as spring steel), which will produce elastic deformation when subjected to an external force, and can return to its original shape under the action of its own elasticity after the external force is removed.

[0062] By arranging a spring 16 between the injection tube 12 and the main body 11 along the axial direction of the injection tube 12, when injection is required, force is applied to the injection tube 12, so that the injection tube 12 overcomes the elastic force of the spring 16 and moves downward and pushes away the baffle 13. At this time, the lower end of the injection tube 12 extends from the first outlet to the injection port 500 of the cavity to be injected to realize injection. After the injection is completed, the force applied to the injection tube 12 is cancelled, and the spring 16 returns to its original shape under the action of its own elasticity, and at the same time drives the injection tube 12 to move upward to realize automatic resetting of the injection tube 12, making the operation of the injection process easier, and the faster resetting of the injection tube 12 can also better reduce the risk of residual liquid accumulated at the lower end of the injection tube 12 dripping onto other objects.

[0063] In some embodiments of the present application, Figure 1 and Figure 2 As shown, the injection nozzle 10 also includes a first extension portion 121 connected to the injection tube 12 . The first extension portion 121 extends outward from the tube wall of the injection tube 12 along the diameter direction of the injection tube 12 . The first extension portion 121 is connected to one end of the spring 16 .

[0064] The first extension portion 121 can be understood as a structure arranged on the outside of the tube wall of the injection tube 12 perpendicular to the axis of the injection tube 12. The first extension portion 121 has a certain hardness and strength. For example, it can be a plate structure made of metal material, so that when the injection tube 12 moves downward, it can provide a reaction force to overcome the elastic force of the spring 16 to do work.

[0065] By setting a first extension portion 121 extending outward from the tube wall of the injection tube 12 along the diameter direction of the injection tube 12 and connected to one end of the spring 16, the first extension portion 121 is perpendicular to the axis of the injection tube 12, which makes it easier to install the spring 16, so that the spring 16 is set between the injection tube 12 and the main body 11 along the axial direction of the injection tube 12, and when the injection tube 12 moves downward relative to the main body 11, the first extension portion 121 can generate pressure or tension on the spring 16 connected thereto to cause the spring 16 to produce elastic deformation.

[0066] In some embodiments of the present application, Figure 1 and Figure 2 As shown, the liquid injection nozzle 10 further includes a fixing seat 14 disposed opposite to the first extension portion 121 . The fixing seat 14 is fixed to the body 11 and connected to the other end of the spring 16 .

[0067] The fixing seat 14 can be understood as a component that connects two or more parts and supports some parts, and its position is fixed.

[0068] By providing a fixing base 14 opposite the first extension 121, the other end of the spring 16 is connected to the fixing base 14. Since the fixing base 14 is fixed to the body 11 and cannot move, when force is applied to the injection tube 12 to cause the injection tube 12 to move downward, the first extension 121 drives one end of the spring 16 connected thereto to move toward (or away from) the fixing base 14, thereby compressing (or stretching) the spring 16 and causing it to elastically deform. For example, if the fixing base 14 is located directly below and opposite the first extension 121, when the injection tube 12 moves downward, the first extension 121 exerts pressure on the spring 16, causing the spring 16 to be compressed between the first extension 121 and the fixing base 14. When the external force is removed, one end of the spring 16 presses against the first extension 121 and rebounds upward, causing the injection tube 12 to move upward and return to its initial position. This initial position can be understood as the position of the injection tube 12 when the spring 16 is in its original state (not elastically deformed) or not driven by an external force.

[0069] In some embodiments of the present application, Figure 1 and Figure 2 As shown, the injection nozzle 10 further includes a second extension portion 122 , one end of the second extension portion 122 is connected to the first extension portion 121 , and the other end of the second extension portion 122 is configured to contact the fixing seat 14 after the injection tube 12 moves downward a preset distance.

[0070] The preset distance is the maximum value of the movable stroke of the injection tube 12. When the spring 16 does not produce elastic deformation, the maximum distance between the other end of the second extension portion 122 and the fixing seat 14 along the axial direction of the injection tube 12 is equal to the preset distance.

[0071] The second extension portion 122 can be understood as a structure extending downwardly along the axis of the injection tube 12 from the end of the first extension portion 121 away from the tube wall of the injection tube 12. In this case, the position of the fixing seat 14 is below the first extension portion 121, and the length of the second extension portion 122 is determined based on the predetermined distance and the position of the fixing seat 14. The second extension portion 122 can be integrally formed from the same material as the first extension portion 121, and the first extension portion 121 can also be integrally formed with the injection tube 12.

[0072] By providing the second extension portion 122, the downward movement distance of the injection tube 12 can be fixed. When the other end of the second extension portion 122 contacts the fixing seat 14, that is, the position of the lower end of the injection tube 12 extending toward the injection port 500 after pushing away the baffle 13 is fixed, thereby preventing the portion of the injection tube 12 extending toward the injection port 500 from being too long, causing the outer wall of the injection tube 12 to touch the liquid to be injected or touch the injection port 500.

[0073] In some embodiments of the present application, Figure 1 and Figure 2 As shown, the liquid injection nozzle 10 further includes a limiting cylinder 15 , which is disposed in the body 11 and configured to contact the tube wall of the liquid injection tube 12 and / or the side wall of the second extension portion 122 .

[0074] The limiting cylinder 15 can be understood as a cylindrical structure formed around the correct direction for limiting the part to maintain linear motion in the correct direction. For example, in the embodiment of the present application, Figure 1 As shown, the limiting cylinder 15 may include a first limiting portion 151 arranged around the axis of the liquid injection tube 12, and a second limiting portion 152 arranged perpendicular to the first limiting portion 151. The side wall of the first limiting portion 151 can contact the side wall of the second extension portion, and the second limiting portion 152 is designed to contact the tube wall of the liquid injection tube 12. In this way, in the process of the liquid injection tube 12 making a linear motion along the height direction of the liquid injection nozzle 10 (that is, the axial direction of the liquid injection tube 12), the first limiting portion 151 and the second limiting portion 152 can simultaneously limit the deflection of the liquid injection tube 12 in its radial direction.

[0075] It can be seen that by arranging a limiting cylinder 15 in the main body 11 that contacts the tube wall of the injection tube 12 and / or the side wall of the second extension part 122, the smoothness of the reciprocating motion of the injection tube 12 along the height direction of the injection nozzle 10 can be improved, thereby avoiding the lower end of the injection tube 12 from scratching the side wall of the injection port 500 due to its own deflection after extending toward the injection port 500.

[0076] In some embodiments of the present application, Figure 1 As shown, the limiting cylinder 15 is further configured to contact the first extending portion 121 .

[0077] For example, the end of the first limiting portion 151 away from the second limiting portion 152 can be connected to the fixing seat 14. The length of the first limiting portion 151 is determined based on the position of the fixing seat 14 and the position of the first extension portion 121 when the injection tube 12 is not driven by an external force, so that the second limiting portion 152 is located above the position of the first extension portion 121 when the injection tube 12 is not driven by an external force and just contacts the first extension portion 121. In this way, when the spring 16 is compressed between the first extension portion 121 and the fixing seat 14, after the external force applied to the injection tube 12 is removed, one end of the spring 16 presses against the first extension portion 121 and rebounds upward. Since the position of the second limiting portion 152 is fixed, the first extension portion 121 moves upward until it contacts the second limiting portion 152 and stops moving. At this time, the injection tube 12 returns to its initial position.

[0078] It can be seen that by setting the limiting cylinder 15 in contact with the first extension portion 121, the injection tube 12 can be better able to automatically return to the initial position and stop after the external force applied to the injection tube 12 is removed.

[0079] In some embodiments of the present application, Figures 1 to 3 As shown, the baffle 13 is detachably connected between the body 11 and the fixing base 14 .

[0080] Since the baffle 13 is used to block the residual liquid dripping from the lower end of the injection tube 12, its surface is often in contact with and adheres to the residual liquid. Especially for corrosive liquids, the baffle 13 is more easily damaged. Therefore, by connecting the baffle 13 between the main body 11 and the fixing seat 14 in a detachable manner, it can be more convenient to clean, maintain and replace the baffle 13.

[0081] In some embodiments of the present application, Figure 3As shown, the baffle 13 includes a fixing ring 131 provided with a plurality of first through holes 1311 and a plurality of fan-shaped elastic sheets 132. The arc edges of the plurality of fan-shaped elastic sheets 132 are embedded in the fixing ring 131 and connected to the fixing ring 131 by bolts passing through the first through holes 1311. The bolts are also passed through the main body 11 and the fixing seat 14.

[0082] The retaining ring 131 is a ring-shaped component used to secure the baffle 13. For example, it can be made of metal to facilitate secure connection with other components and resist deformation. It has a certain degree of hardness and strength, and can maintain its position and state after being fixed. In geometry, a ring generally refers to a circular ring, which can be understood as the solid portion remaining after a small concentric disk is removed from a large disk. It has a strong symmetry and is a centrally symmetrical figure with the center of the circle as the center of symmetry, and is also an axially symmetrical figure with infinite axes of symmetry.

[0083] The fan-shaped elastic sheet 132 can be understood as a fan-shaped sheet structure that can produce elastic deformation and automatically restore its original shape. The fan-shaped refers to a figure surrounded by two radii of the central angle and the arc corresponding to the central angle. The axis of the injection tube 12 is aligned with the center of the fixed ring 131, and the arc edges of multiple fan-shaped elastic sheets 132 are embedded in the fixed ring 131 to fill the inner circle of the fixed ring 131 and cover the first outlet. In this way, when the injection tube 12 moves downward and contacts the fan-shaped elastic sheet 132, the tip of the fan-shaped elastic sheet 132 is easier to be pushed open, and multiple fan-shaped elastic sheets 132 can be pushed open at the same time, making the structure more stable in use.

[0084] The first through hole 1311 can be understood as a hole on the fixing ring 131 that completely passes through the solid part of the fixing ring 131 .

[0085] A bolt is a mechanical fastener, typically comprising a head and a screw (a cylinder with external threads). Bolt connection is a detachable fixed connection method for two or more parts. Typically, at least one connected part has a through hole, and at least one connected part has a hole with an internal thread that matches the external thread on the bolt. The bolt is rotated to securely connect the connected parts together by utilizing the fit between the screw and the through hole, and between the external thread and the internal thread. The bolt is rotated in the opposite direction to remove the screw from the through hole, thereby achieving disassembly of the connected parts, making assembly and disassembly operations more convenient. In the embodiment of the present application, bolts are simultaneously inserted through the body 11, the fixing ring 131, the fan-shaped elastic sheet 132, and the fixing seat 14 to achieve the connection between the fan-shaped elastic sheet 132 and the fixing ring 131 and to enable the baffle 13 to be detachably connected between the body 11 and the fixing seat 14.

[0086] By providing a fixing ring 131 and a plurality of fan-shaped elastic pieces 132, on the one hand, it is easier to fix the baffle 13 at a position of the main body 11 that can cover the first outlet. On the other hand, when the lower end of the injection tube 12 moves upward to above the first outlet, the fan-shaped elastic piece 132 of the baffle 13 can automatically restore to its original state, so that after the injection is completed, the injection tube 12 is reset, and the baffle 13 is restored to the state of covering the first outlet to block the residual liquid dripping from the injection tube 12.

[0087] In some embodiments of the present application, the liquid injection tube 12 is provided with a guide portion 123 , and the diameter of the guide portion 123 gradually decreases from the upper end portion of the liquid injection tube 12 to the lower end portion of the liquid injection tube 12 .

[0088] The guide portion 123 can be understood as the portion of the liquid injection tube 12 that provides a guide for the liquid to be injected. Figure 1 and Figure 2 As shown, a guide portion 123 may be provided at the lower end of the liquid injection tube 12 .

[0089] By providing a guide portion 123 whose diameter gradually decreases from the upper end of the injection tube 12 to the lower end of the injection tube 12, the liquid to be injected in the injection tube 12 can flow from top to bottom to the guide portion 123, and then be concentrated into a liquid column with a thinner diameter to enter the injection port 500, so as to better prevent the liquid to be injected from splashing onto other components and objects.

[0090] In some embodiments of the present application, the baffle 13 is provided with an inclined surface 1301 adapted to the guide portion 123 .

[0091] The inclined surface 1301 can be understood as a plane that is inclined at an angle to a plane on the baffle 13, and the inclined angle is usually an acute angle. Figure 3 As shown, in the embodiment of the present application, the inclined surface 1301 can be the upper surface of the fan-shaped elastic piece 132 that forms an inclined angle with the lower surface thereof.

[0092] By providing the inclined surface 1301 adapted to the guide portion 123 , when the liquid injection tube 12 moves downward, it helps the liquid injection tube 12 to achieve interference fit with the baffle 13 and makes it easier to push the baffle 13 away.

[0093] In some embodiments of the present application, Figures 1 to 3As shown, the injection nozzle 10 includes a body 11, an injection tube 12, a baffle 13, a fixing seat 14, a limiting cylinder 15, and a spring 16. The body 11 has a channel arranged along the height direction of the injection nozzle 10, and a first outlet is provided at the lower part of the channel; the injection tube 12 is arranged in the channel in a manner of reciprocating along the height direction, and the injection tube 12 includes a first extension portion 121 and a second extension portion 122, and the first extension portion 121 is connected to one end of the spring 16; the fixing seat is arranged opposite to the first extension portion 121, the fixing seat 14 is fixed to the body 11 and connected to the other end of the spring 16, and the other end of the second extension portion 122 is configured to contact the fixing seat 14 after the injection tube 12 moves downward by a preset distance; the spring 16 is configured to generate elastic deformation when the injection tube 12 moves downward relative to the body 11; the spring 16 is configured to generate elastic deformation when the injection tube 12 moves downward relative to the body 11 When the bottle is in the liquid injection tube 12, the bottle is in the liquid injection tube 12 and the bottle is in the liquid injection tube 12. When the bottle is in the liquid injection tube 12, the bottle is in the liquid injection tube 12 and the bottle is in the liquid injection tube 12. When the bottle is in the liquid injection tube 12, the bottle is in the liquid injection tube 12 and the bottle is in the liquid injection tube 12. The bottle is in the liquid injection tube 12 and the bottle is in the liquid injection tube 12.

[0094] According to the liquid injection nozzle 10 provided in the embodiment of the present application, since its liquid injection tube 12 can reciprocate along the height direction of the liquid injection nozzle 10 in the channel provided in its body 11, a first outlet is provided at the lower part of the channel, and the multiple fan-shaped elastic pieces 132 of its baffle 13 cover the first outlet when the lower end of the liquid injection tube 12 is higher than the first outlet, and are pushed open by the liquid injection tube 12 when the lower end of the liquid injection tube 12 is lower than the first outlet. In this way, when liquid injection is needed, the first outlet of the liquid injection nozzle 10 is aligned with the liquid injection port 500 of the cavity to be injected, and the liquid injection tube 12 is moved to push the multiple fan-shaped elastic pieces 132 of the baffle 13, so that the lower end of the liquid injection tube 12 can be opened. The end leads from the first outlet to the outside of the main body 11, that is, extends to the injection port 500 of the cavity to be injected. The liquid to be injected is transported from the upper end of the injection tube 12 to the lower end of the injection tube 12 to enter the cavity to be injected to realize injection; after the injection is completed, the spring 16 returns to its original shape under the action of its own elasticity, and at the same time drives the injection tube 12 to move upward to realize automatic resetting of the injection tube 12, so that the lower end of the injection tube 12 is restored to above the first outlet. At this time, the multiple elastic sheets 132 return to their original shape to cover the first outlet, which can block the residual liquid dripping from the lower end of the injection tube 12, thereby reducing the impact of the residual liquid on the external environment and other objects, and reducing pollution. The inner wall of the main body 11 is prevented from adhering to the liquid to be injected by the movable injection tube 12, and the liquid to be injected can be prevented from being adhered to the inner wall of the main body 11, especially for the corrosive liquid to be injected, by replacing the injection tube 12 with a suitable material, the versatility and maintainability of the injection nozzle 10 are enhanced; by providing a limiting cylinder 15 in contact with the tube wall of the injection tube 12, the first extension part 121, and the side wall of the second extension part 122, the stability of the reciprocating motion of the injection tube 12 in the height direction of the injection nozzle 10 can be improved, and the lower end of the injection tube 12 can be prevented from being bent due to its own deviation after extending to the injection port 500 The swing causes scratches against the side wall of the liquid injection port 500, and at the same time, after the external force applied to the liquid injection tube 12 is removed, the liquid injection tube 12 can better automatically restore to its initial position and stop; the second extension portion 122 can also fix the downward movement distance of the liquid injection tube 12. When the other end of the second extension portion 122 contacts the fixing seat 14, that is, the position of the lower end of the liquid injection tube 12 extending toward the liquid injection port 500 after pushing away the baffle 13 is fixed, thereby avoiding the part of the liquid injection tube 12 extending toward the liquid injection port 500 being too long, causing the outer wall of the liquid injection tube 12 to touch the liquid to be injected or touch the liquid injection port 500.

[0095] like Figures 1 to 4 As shown, an embodiment of the second aspect of the present application provides a liquid injection device, including the liquid injection nozzle 10 provided according to the embodiment of the first aspect of the present application.

[0096] According to the embodiment of the second aspect of the present application, the liquid injection nozzle 10 provided by the embodiment of the second aspect of the present application has a liquid injection tube 12 that can reciprocate along the height direction of the liquid injection nozzle 10 in the channel provided in the body 11 thereof, and a first outlet is provided at the lower portion of the channel, and the baffle 13 is connected to the body 11 and is configured to cover the first outlet when the lower end of the liquid injection tube 12 is higher than the first outlet, and to be pushed away by the liquid injection tube 12 when the lower end of the liquid injection tube 12 is lower than the first outlet. In this way, when liquid injection is required, the first outlet of the liquid injection nozzle 10 is aligned with the liquid injection port 50 of the cavity to be injected. 0, driving the injection tube 12 to push aside the baffle 13, the lower end of the injection tube 12 can pass from the first outlet to the outside of the main body 11, that is, extend to the injection port 500 of the liquid cavity to be injected, and the liquid to be injected is transported from the upper end of the injection tube 12 to the lower end of the injection tube 12 to enter the liquid cavity to be injected to achieve injection; after the injection is completed, the injection tube 12 is moved back so that its lower end is restored to the top of the first outlet. At this time, the baffle 13 covers the first outlet, which can block the residual liquid dripping from the lower end of the injection tube 12, thereby reducing the impact of the residual liquid on the external environment and other objects and reducing pollution. Moreover, by transporting the liquid to be injected through the movable injection tube 12, the liquid to be injected can be prevented from adhering to the inner wall of the main body 11. In particular, for corrosive liquid to be injected, the liquid to be injected can be replaced by replacing the injection tube 12 with a suitable material, and the injection nozzle 10 is more versatile and maintainable.

[0097] In some embodiments of the present application, Figure 4 As shown, the liquid injection device also includes a liquid injection cup 20, a driving mechanism, and a liquid blocking rod 30. The liquid injection cup 20 includes a cavity 21 for accommodating electrolyte, an upper cover 22 disposed at one end of the cavity 21, and a lower cover 23 disposed at the other end of the cavity 21. The lower cover 23 is provided with a second through hole. The liquid injection tube 12 of the liquid injection nozzle 10 is fixedly provided through the second through hole and communicates with the cavity 21. The upper cover 22 is provided with a third through hole. The driving mechanism is used to drive the liquid injection cup 20 to move from the first position to the second position. The liquid blocking rod 30 is fixed and is provided through the third through hole. One end of the liquid blocking rod 30 is configured to tightly abut against the upper end of the liquid injection tube 12 and is separated from the liquid injection tube 12 when the liquid injection cup 20 reaches the second position.

[0098] The liquid filling cup 20 can be understood as a container for storing liquid to be filled and configured to provide the liquid to be filled to the liquid filling tube 12 when performing a liquid filling operation.

[0099] The cavity 21 can be understood as a hollow structure that isolates the liquid to be injected from the outside world.

[0100] The upper cover 22 can be understood as a structure that is adapted to the top of the cavity 21 in the height direction of the liquid injection device, used to cover the top of the cavity 21 and connect with other components.

[0101] The lower cover 23 can be understood as a structure that is adapted to the bottom of the cavity 21 in the height direction of the liquid injection device, used to cover the bottom of the cavity 21 and connected to other components.

[0102] The second through hole can be understood as a hole that completely penetrates the lower cover 23 along the height direction of the liquid injection device.

[0103] The third through hole can be understood as a hole that completely penetrates the upper cover 22 along the height direction of the liquid injection device.

[0104] The driving mechanism can be understood as a device that can provide a power source and transmit power to drive other moving parts or machines to move in the desired manner. In the embodiment of the present application, the driving mechanism can be understood as a device that drives the injection cup 20 to move downward along the height direction of the injection device.

[0105] The first position can be understood as the height position of the injection cup 20 when it is not driven by the driving mechanism. The second position can be understood as the height position of the injection cup 20 when the lower end of the injection tube 12 is in the ideal position after pushing off the baffle 13. Herein, the height position refers to a certain spatial point along the height direction of the injection device; the ideal position refers to the position where the lowest point of the lower end of the injection tube 12 stops when the liquid to be injected flows out after the injection tube 12 moves downward and pushes off the baffle 13 and can just enter the injection port 500. For example, in the embodiment of the present application, if Figure 2 As shown, after the injection tube 12 moves downward to push away the baffle 13, the lowest point of the lower end of the injection tube 12 is flush with the upper surface of the injection port 500. In this way, it can prevent the lower end of the injection tube 12 from being too high relative to the injection port 500, which makes it easy for the liquid to be injected to splash outside the injection port 500 or onto other objects, causing waste and pollution; it can also prevent the part of the injection tube 12 extending toward the injection port 500 from being too long, causing the outer wall of the injection tube 12 to touch the liquid to be injected or touch the injection port 500.

[0106] The liquid blocking rod 30 can be understood as a long strip structure extending along the height direction of the liquid injection device.

[0107] By setting the liquid injection cup 20, the driving mechanism, and the liquid blocking rod 30, when the driving mechanism does not drive the liquid injection cup 20, the liquid blocking rod 30 tightly abuts the upper end of the liquid injection tube 12, so that the liquid to be injected in the cavity 21 of the liquid injection cup 20 cannot flow into the liquid injection tube 12; when the driving mechanism drives the liquid injection cup 20 to make the liquid injection cup 20 reach the second position, the liquid injection cup 20 also drives the liquid injection tube 12 fixedly penetrated through its lower cover 23 to move downward until its lower end reaches the ideal position. At this time, the liquid blocking rod 30 is separated from the liquid injection tube 12, and the liquid injection tube 12 is connected with the cavity 21, and the liquid to be injected flows downward from the upper end of the liquid injection tube 12 to its lower end, thereby entering the liquid injection port 500 to achieve liquid injection.

[0108] 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 make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions 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.

[0109] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0110] The various embodiments of the present application are described in a related manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.

[0111] The above description is only a preferred embodiment of the present application and is not intended to limit the scope of protection of the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application are included in the scope of protection of the present application.

Claims

1. A liquid injection nozzle (10), characterized in that: include: The main body (11) has a channel arranged along the height direction of the liquid injection nozzle (10), and a first outlet is provided at the lower part of the channel; A liquid injection pipe (12) is provided in the channel in a manner of reciprocating motion along the height direction; a baffle (13) connected to the body (11) and configured to cover the first outlet when the lower end of the liquid injection tube (12) is higher than the first outlet, and to be pushed away by the liquid injection tube (12) when the lower end of the liquid injection tube (12) is lower than the first outlet; a spring (16) disposed between the injection tube (12) and the body (11) along the axial direction of the injection tube (12) and configured to generate elastic deformation when the injection tube (12) moves downward relative to the body (11); The injection nozzle (10) further comprises a first extension portion (121) connected to the injection tube (12), the first extension portion (121) extending outward from the tube wall of the injection tube (12) along the diameter direction of the injection tube (12), and the first extension portion (121) is connected to one end of the spring (16); The liquid injection nozzle (10) further includes a fixing seat (14) arranged opposite to the first extension portion (121), wherein the fixing seat (14) is fixed to the body (11) and connected to the other end of the spring (16); The injection nozzle (10) further comprises a second extension portion (122), one end of the second extension portion (122) being connected to the first extension portion (121), and the other end of the second extension portion (122) being configured to abut against the fixing seat (14) after the injection tube (12) moves downward a preset distance.

2. The liquid injection nozzle (10) according to claim 1, characterized in that: The liquid injection nozzle (10) further comprises a limiting cylinder (15), wherein the limiting cylinder (15) is disposed in the body (11) and is configured to contact the tube wall of the liquid injection tube (12) and / or the side wall of the second extension portion (122).

3. The liquid injection nozzle (10) according to claim 2, characterized in that: The limiting cylinder (15) is also configured to contact the first extending portion (121).

4. The liquid injection nozzle (10) according to any one of claims 1 to 3, characterized in that The baffle (13) is detachably connected between the body (11) and the fixing seat (14).

5. The liquid injection nozzle (10) according to claim 4, characterized in that: The baffle (13) comprises a fixing ring (131) provided with a plurality of first through holes (1311) and a plurality of fan-shaped elastic sheets (132), wherein the arcuate edges of the plurality of fan-shaped elastic sheets (132) are embedded in the fixing ring (131) and connected to the fixing ring (131) via bolts passing through the first through holes (1311), and the bolts are also passed through the body (11) and the fixing seat (14).

6. The liquid injection nozzle (10) according to any one of claims 1 to 5, characterized in that The liquid injection pipe (12) is provided with a flow guide portion (123), and the diameter of the flow guide portion (123) gradually decreases in a direction from the upper end portion of the liquid injection pipe (12) to the lower end portion of the liquid injection pipe (12).

7. The liquid injection nozzle (10) according to claim 6, characterized in that: The baffle (13) is provided with an inclined surface (1301) adapted to the flow guide portion (123).

8. A liquid injection device, characterized in that: It comprises a liquid injection nozzle (10) according to any one of claims 1 to 7.

9. The liquid injection device according to claim 8, characterized in that: The liquid injection device also includes: A liquid injection cup (20), the liquid injection cup (20) comprising a cavity (21) for accommodating electrolyte, an upper cover (22) arranged at one end of the cavity (21), and a lower cover (23) arranged at the other end of the cavity (21), the lower cover (23) being provided with a second through hole, the liquid injection tube (12) of the liquid injection nozzle (10) being fixedly provided through the second through hole and communicating with the cavity (21), and the upper cover (22) being provided with a third through hole; A driving mechanism, the driving mechanism being used to drive the liquid injection cup (20) to move from a first position to a second position; A liquid blocking rod (30) is fixed in position and is passed through the third through hole, one end of the liquid blocking rod (30) is configured to tightly abut against the upper end of the liquid injection tube (12) and to separate from the liquid injection tube (12) when the liquid injection cup (20) reaches the second position.

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