CN221257772U - One-way valve, liquid injection pump, liquid injection device and battery production line - Google Patents

Abstract

The application discloses a one-way valve, a liquid injection pump, a liquid injection device and a battery production line. A one-way valve includes a valve body, a valve spool, and a first elastic member. The valve body is provided with a containing cavity, and the valve body is provided with a first through hole and a second through hole which are communicated with the containing cavity. The first through hole is a liquid inlet hole, and the second through hole is a liquid outlet hole. The valve core is arranged in the accommodating cavity and is used for closing or opening the first through hole. The valve core comprises a body and a guide part used for entering the first through hole, and the guide part is arranged at one end of the body in the first direction. The cross-sectional area of the guide portion gradually decreases in a direction away from the body. The first elastic piece is arranged in the accommodating cavity and is used for providing elastic force for the valve core so as to drive the valve core to move towards the first through hole. The one-way valve provided by the application can reduce the production cost of the one-way valve.

Description

One-way valve, liquid injection pump, liquid injection device and battery production line

Technical Field

The application relates to the field of battery production, in particular to a one-way valve, a liquid injection pump, a liquid injection device and a battery production line.

Background

A one-way valve is a valve for controlling the one-way flow of a fluid in a conduit. The check valve is typically designed to allow free passage of fluid in one direction and to automatically close when fluid flows in the opposite direction, preventing backflow of fluid.

In addition to the reliability of the check valve, reducing the manufacturing cost of the check valve is also a concern in the development of the check valve.

Disclosure of utility model

The embodiment of the application provides a one-way valve, a liquid injection pump, a liquid injection device and a battery production line, which can reduce the production cost of the one-way valve.

In a first aspect, an embodiment of the present application provides a check valve for controlling unidirectional flow of an electrolyte, the check valve including a valve body, a valve core, and a first elastic member. The valve body is provided with a containing cavity, and the valve body is provided with a first through hole and a second through hole which are communicated with the containing cavity. The first through hole is a liquid inlet hole, and the second through hole is a liquid outlet hole. The valve core is arranged in the accommodating cavity and is used for closing or opening the first through hole. The valve core comprises a body and a guide part used for entering the first through hole, and the guide part is arranged at one end of the body in the first direction. The cross-sectional area of the guide portion gradually decreases in a direction away from the body. The first elastic piece is arranged in the accommodating cavity and is used for providing elastic force for the valve core so as to drive the valve core to move towards the first through hole.

In the technical scheme of the embodiment of the application, the valve core comprises a guide part for entering the first through hole, and the cross section area of the guide part is gradually reduced along the direction deviating from the body. So that the guide portion can guide the valve core, and the valve core can seal the first through hole. Therefore, guide parts are not required to be added in the accommodating cavity, the number of parts of the one-way valve is reduced, and the production cost of the one-way valve is reduced.

In some embodiments, the valve body has a first wall, and the first through hole is disposed in the first wall. The check valve further includes a first seal for sealing a gap between the valve spool and the first wall.

In the above solution, the first seal closes the gap between the valve core and the first wall, thereby reducing the risk of fluid flowing out of the accommodation chamber from the first through hole when the valve core closes the first through hole.

In some embodiments, the body includes a first portion and a second portion arranged in sequence along a first direction, the first portion being connected to the guide. The second portion protrudes from the outer peripheral surface of the first portion in the radial direction of the spool to form a first stepped surface between the second portion and the first portion. The first sealing piece is sleeved on the first part and is abutted with the first step surface.

In the above-mentioned scheme, when first sealing member and first step face butt to make the case seal first through-hole, the elastic force that first elastic component provided can pass through first step face and give first sealing member to make first wall and first step face compress tightly first sealing member, thereby make first sealing member can fully fill the clearance between first step face and the first wall, this is favorable to improving the reliability of check valve.

In some embodiments, the guide portion protrudes from an outer circumferential surface of the first portion in a radial direction of the spool to form a second stepped surface between the guide portion and the first portion. In the first direction, the first seal is located between the first step surface and the second step surface.

In the scheme, the first sealing element is positioned between the first step surface and the second step surface, so that the first step surface and the second step surface form structural limit to the first sealing element, the risk of relative movement of the first sealing element relative to the first part along the first direction when the valve core moves along the first direction is reduced, and the reliability of the one-way valve is improved.

In some embodiments, the body further comprises a third portion. The first portion, the second portion and the third portion are arranged in sequence along the first direction. The second portion protrudes from the outer peripheral surface of the third portion in the radial direction of the spool to form a third stepped surface between the second portion and the third portion. One end of the first elastic piece is sleeved outside the third part and is abutted with the third step surface.

In the above scheme, one end of the first elastic member is sleeved outside the third part and is abutted to the third step surface. The third step is arranged at one end of the first elastic piece, which faces the first through hole, so that the risk of movement of the first elastic piece along the first direction relative to the valve core when the valve core is far away from the first through hole along the first direction is reduced, and the reliability of the one-way valve is improved.

In some embodiments, the valve body has a second wall disposed opposite the first wall in the first direction, and the second through hole is disposed in the second wall. The two ends of the first elastic piece are respectively connected with the valve core and the second wall.

In the scheme, the first wall and the second wall are oppositely arranged along the first direction, and the two ends of the first elastic piece are respectively connected with the valve core and the second wall, so that the elastic force direction provided by the first elastic piece is parallel to the first direction, the risk that the guide part cannot be effectively driven into the first through hole due to the fact that the elastic force deviates from the first direction is reduced, and the reliability of the one-way valve is improved.

In a second aspect, an embodiment of the present application provides an electrolyte pump for injecting electrolyte into a battery cell, the electrolyte pump including a pump body, a pump core, a first check valve, and a second check valve. Wherein the first check valve and the second check valve are both check valves provided by any one embodiment of the first aspect. The pump body has a pump cavity, and at least a portion of the pump core is disposed within the pump body. The first through hole of the first one-way valve and the second through hole of the second one-way valve are communicated with the pump cavity.

In the above solution, since the liquid injection pump has the check valve in the embodiment of the first aspect, the liquid injection pump also has the beneficial effects in the embodiment of the first aspect. Specifically, the valve core of the one-way valve in the liquid injection pump comprises a guide part for entering the first through hole, and the cross-sectional area of the guide part gradually decreases along the direction away from the body. So that the guide portion can guide the valve core, and the valve core can seal the first through hole. Therefore, guide parts are not required to be added in the accommodating cavity, the number of parts of the one-way valve is reduced, and the production cost of the one-way valve is reduced. Thereby reducing the production cost of the liquid injection pump.

Meanwhile, as the parts of the one-way valve in the liquid injection pump are reduced, the friction among the parts is reduced, and the heat generated by friction of the one-way valve in the working process is reduced, so that the risk of movement blocking of the parts of the one-way valve due to crystallization of electrolyte on the surfaces of the parts of the one-way valve is reduced.

In some embodiments, the pump core has a first end face and a second end face disposed opposite to each other along a direction of movement of the pump core, and a first peripheral face connecting the first end face and the second end face. The first perimeter includes a first region that is located outside the pump body when the volume of the pump chamber is maximized. The infusion pump further includes a covering member covering at least the first region.

In the scheme, the cladding piece at least cladding the first area to make in the pump injection process of injection pump, the cladding piece can protect the pump core and expose the part outside the pump body, has reduced when bearing external force, the risk that the pump core damaged.

In some embodiments, the first end face is located outside the pump body when the volume of the pump chamber is maximized, and the cladding member wraps around the first end face.

In the scheme, the first end face is coated by the coating piece, so that the part of the pump core exposed out of the pump body can be protected by the coating piece in the process of pumping of the liquid injection pump, and the risk of damaging the pump core when bearing external force is reduced.

In some embodiments, the pump body includes a first cavity and a second cavity aligned along a direction of movement of the pump core. The second end surface and at least a part of the inner wall of the first cavity are surrounded to form a pump cavity. The radial dimension of the first cavity is smaller than that of the second cavity along the radial direction of the pump core, and the part of the cladding piece is positioned between the inner peripheral surface and the first peripheral surface of the second cavity.

In the above scheme, the part of the cladding piece is positioned between the inner peripheral surface of the second cavity and the first peripheral surface, so that the cladding piece can be matched with the inner peripheral surface of the second cavity to isolate the outside from the second cavity, and the risk that the outside sundries enter the second cavity to influence the movement of the pump core is reduced.

In a third aspect, an embodiment of the present application provides a liquid injection device for injecting an electrolyte into a battery cell, where the liquid injection device includes the liquid injection pump, the tank, the liquid outlet pipe, the liquid inlet pipe and the driving component provided in any one of the embodiments of the second aspect. The box is used for holding the liquid injection pump. The drain pipe is used for connecting the second through hole of the first check valve. The liquid inlet pipe is used for connecting the first through hole of the second one-way valve. At least a portion of the drive assembly is disposed within the housing and is coupled to the pumping core of the infusion pump, the drive assembly being configured to drive the pumping core in a reciprocating motion.

In the scheme, as the liquid injection pump is accommodated in the box body, the box body can reduce the contact between the liquid injection pump and the outside air, so that the risk of influencing the movement of the pump core due to the fact that the electrolyte is separated out of crystals on the surface of the pump core of the liquid injection pump is reduced.

In a fourth aspect, an embodiment of the present application provides a battery production line including the priming device provided in any one of the embodiments of the third aspect.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a cross-sectional view of a one-way valve with a valve cartridge according to some embodiments of the present application closing a first through hole;

FIG. 2 is a cross-sectional view of a check valve provided in some embodiments of the present application when a valve element opens a first through hole;

FIG. 3 is a schematic structural view of a valve element according to some embodiments of the present application;

FIG. 4 is an enlarged view of portion A of FIG. 2;

FIG. 5 is an enlarged view of portion B of FIG. 2;

FIG. 6 is a cross-sectional view of a pump chamber of a pump provided in some embodiments of the present application with a minimum volume;

FIG. 7 is a cross-sectional view of a fluid pump provided in some embodiments of the present application with a maximum volume of a pump chamber;

Fig. 8 is a cross-sectional view of an priming device provided in some embodiments of the present application.

Icon:

1000-priming device;

100-a liquid injection pump;

10-a one-way valve; 10A-a first one-way valve; 10B-a second one-way valve; 11-a valve body; 11A-a first wall; 11B-a second wall; 11C-a containing cavity; 111-valve sleeve; 112-a first end cap; 112A-a first via; 113-a second end cap; 113A-a second via; 113B-a first groove; 12-valve core; 121-a guide; 122-body; 122A-a first portion; 122B-a second portion; 122C-third portion; 122D-first step surface; 122E-a second step surface; 122F-a third step surface; 13-a first elastic member; 14-a first seal;

20-a pump body; 20A-a pump chamber; 20B-a first flow channel; 21-a pump sleeve; 21A-a first cavity; 21B-a second cavity; 22-a third end cap;

30-a pump core; 31-a first end face; 32-a second end face; 33-a first peripheral surface; 331-first region;

40-cladding;

200-a box body; 300-liquid inlet pipe; 400-liquid outlet pipe; 500-a drive assembly;

x-a first direction; y-second direction.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description of the application and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion. The terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "attached" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

The term "and/or" in the present application is merely an association relation describing the association object, and indicates that three kinds of relations may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In the present application, the character "/" generally indicates that the front and rear related objects are an or relationship.

In the embodiments of the present application, the same reference numerals denote the same components, and detailed descriptions of the same components are omitted in different embodiments for the sake of brevity. It should be understood that the thickness, length, width, etc. dimensions of the various components in the embodiments of the application shown in the drawings, as well as the overall thickness, length, width, etc. dimensions of the integrated device, are merely illustrative and should not be construed as limiting the application in any way.

The term "plurality" as used herein refers to two or more (including two).

In the embodiment of the application, the battery cell can be a secondary battery, and the secondary battery refers to a battery cell which can activate the active material in a charging mode to continue to use after the battery cell discharges.

The battery cells include, but are not limited to, lithium ion batteries, sodium lithium ion batteries, lithium metal batteries, sodium metal batteries, lithium sulfur batteries, magnesium ion batteries, nickel hydrogen batteries, nickel cadmium batteries, lead storage batteries, and the like.

The battery cell may include a case, an electrode assembly.

The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge of the battery cell, active ions (e.g., lithium ions) are inserted and extracted back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, so that the risk of short circuit of the positive electrode and the negative electrode can be reduced, and meanwhile, active ions can pass through the separator.

The case serves to define a sealed space for accommodating the electrode assembly, the electrolyte, and other components.

The electrolyte injection device is an apparatus for precisely controlling the flow of an electrolyte and injecting the electrolyte into a battery cell.

The electrolyte is a liquid used for transmitting ions inside the battery and plays an important role in the performance and stability of the battery.

The electrolyte injection device generally comprises a syringe for injecting electrolyte into the battery cell, an electrolyte injection pump, and a connecting pipeline (such as a liquid inlet pipe for connecting the electrolyte injection pump and the electrolyte storage device and a liquid outlet pipe for connecting the electrolyte injection pump and the syringe), and a driving assembly for driving the electrolyte injection pump to move.

The liquid injection pump is a component for driving electrolyte to enter a pump cavity of the liquid injection pump from the liquid inlet pipe or driving electrolyte to leave the pump cavity of the liquid injection pump from the liquid outlet pipe.

In order to enable electrolyte to enter the pump cavity of the injection pump from the liquid inlet pipe when the injection pump drives the electrolyte to enter the pump cavity of the injection pump from the liquid inlet pipe, and simultaneously in order to enable electrolyte to enter the liquid inlet pipe from the pump cavity of the injection pump when the injection pump drives the electrolyte to leave the pump cavity of the injection pump from the liquid outlet pipe. The infusion pump needs to have a one-way valve to control the one-way flow of electrolyte along the feed tube to the pump chamber of the infusion pump and to control the one-way flow of electrolyte along the pump chamber of the infusion pump to the discharge tube 400.

A one-way valve is a valve for controlling the one-way flow of a fluid in a conduit.

In the prior art, a check valve generally comprises a valve body, a valve core, an elastic member and a guide member.

The valve body is the main body part of the one-way valve and is a shell with a containing cavity for containing other components.

The valve element is a component of the check valve for controlling the flow direction of the fluid. The valve element is typically a movable member that opens to allow fluid to pass through when fluid flows through the one-way valve in a set direction; when fluid flows through the one-way valve in a direction opposite to the set direction, the valve element closes to prevent backflow of the fluid.

The elastic member is generally used for providing elastic force, helping the valve core to be quickly closed in the reverse flow, and ensuring the sealing performance of the valve.

The guide piece is generally sleeved outside the valve core and is used for abutting against the inner wall of the accommodating cavity of the valve core to guide the valve core. So that the valve body can move stably in a set direction to open and close the check valve.

However, in the process of pumping the electrolyte, the electrolyte can enter a gap between the guide piece and the accommodating cavity of the valve body along the radial direction of the valve core, and when the guide piece moves relative to the accommodating cavity, heat is generated due to friction, so that a solvent of the electrolyte is evaporated, and a solute of the electrolyte is precipitated and crystallized. So that the spool and guide movement is affected.

In view of this, in order to reduce the risk of the valve element and the guide movement being affected by the solute precipitation and crystallization of the electrolyte. And simultaneously, in order to reduce the manufacturing cost of the one-way valve. The application provides a one-way valve, wherein a valve core of the one-way valve comprises a guide part for entering a first through hole, and the cross section area of the guide part gradually decreases along the direction away from a body. So that the guide portion can guide the valve core, and the valve core can seal the first through hole. Therefore, guide parts are not required to be added in the accommodating cavity, the number of parts of the one-way valve is reduced, friction of the parts in the accommodating cavity is reduced, friction among the parts is reduced, and heat generated by friction of the one-way valve in the working process is reduced. Therefore, the risk of movement blocking of the part of the one-way valve caused by crystallization of electrolyte on the surface of the part of the one-way valve is reduced. And the production cost of the one-way valve is reduced.

The specific structure of the check valve will be described in detail with reference to the accompanying drawings.

Referring to fig. 1 and fig. 2, fig. 1 is a cross-sectional view of a check valve 10 when a valve core 12 provided in some embodiments of the present application closes a first through hole 112A, and fig. 2 is a cross-sectional view of the check valve 10 when the valve core 12 provided in some embodiments of the present application opens the first through hole 112A. The embodiment of the application provides a one-way valve 10 comprising a valve body 11, a valve core 12 and a first elastic member 13. The valve body 11 has a housing chamber 11C, and the valve body 11 has a first through hole 112A and a second through hole 113A communicating with the housing chamber 11C. The first through hole 112A is a liquid inlet hole, and the second through hole 113A is a liquid outlet hole. The valve core 12 is disposed in the accommodating chamber 11C, and the valve core 12 is used for closing or opening the first through hole 112A. The valve spool 12 includes a body 122 and a guide portion 121 for entering the first through hole 112A, the guide portion 121 being provided at one end of the body 122 in the first direction X. The cross-sectional area of the guide 121 gradually decreases in a direction away from the body 122. The first elastic member 13 is disposed in the accommodating cavity 11C, and the first elastic member 13 is configured to provide an elastic force to the valve core 12 to drive the valve core 12 to move toward the first through hole 112A.

The valve body 11 is a member for accommodating other components in the check valve 10.

In some embodiments, the valve body 11 includes a valve housing 111, a first end cap 112, and a second end cap 113, the valve housing 111 having a first opening and a second opening, the first end cap 112 and the second end cap 113 capping the first opening and the second opening, respectively. The valve body 11 is designed in a split type, so that the valve core 12 and other parts can be conveniently placed in the accommodating cavity 11C in the valve body 11, meanwhile, the manufacturing difficulty of the valve body 11 is reduced, and the production cost of the valve body 11 is reduced.

The valve element 12 is a component of the check valve 10 for controlling the flow direction of fluid. The valve core 12 is movably arranged in the accommodating cavity 11C in the valve body 11.

The first elastic member 13 may be a member having an elastic structure, and the first elastic member 13 may be a spring, a coil spring, rubber, or the like, as an example. The first elastic member 13 is a component for providing an elastic force in the check valve 10, and the elastic force of the first elastic member 13 can drive the valve core 12 to move toward the first through hole 112A so as to close the first through hole 112A.

The first direction X may be a direction parallel to the axial direction of the spool 12 and/or the first direction X may be parallel to the direction of movement of the spool 12.

It is understood that the axis of the first through hole 112A may be parallel to the first direction X.

The guide portion 121 is a portion of the spool 12 for entering the first through hole 112A; the body 122 is a portion of the spool 12 constantly located in the accommodation chamber 11C. The body 122 and the guide portion 121 may be connected by welding or may be fixed to each other by integral molding.

"In a direction away from the body 122" may be understood as a direction along the first direction X and away from the body 122 and toward the first through hole 112A.

By "gradually decreasing the cross-sectional area of the guide 121 in a direction away from the body 122" it is understood that there is a plane perpendicular to the first direction X, which plane intercepts the guide 121 with a decreasing cross-sectional area as the distance of the plane from the body 122 in the first direction X increases.

Illustratively, the guide portion 121 may have a pyramid shape such as a triangular pyramid, a square pyramid, a pentagonal pyramid, or the like, or the guide portion 121 may have a truncated cone shape.

In the embodiment where the guide portion 121 is in the shape of a truncated cone, the transition of the outer peripheral side of the guide portion 121 is smooth, and the risk that the guide portion 121 scratches the inner wall of the first through hole 112A is reduced.

In the above-described solution, the valve core 12 includes the guide portion 121 for entering the first through hole 112A, and the cross-sectional area of the guide portion 121 gradually decreases in a direction away from the body 122. So that the guide portion 121 can guide the valve body 12 so that the valve body 12 can seal the first through hole 112A. Thereby eliminating the need to add a guide part in the accommodating chamber 11C, thereby reducing the number of parts of the check valve 10, and thus reducing the production cost of the check valve 10.

Referring to fig. 1 and 2, according to some embodiments of the present application, the valve body 11 has a first wall 11A, and the first through hole 112A is disposed on the first wall 11A. The check valve 10 further includes a first seal 14, the first seal 14 for sealing a gap between the valve spool 12 and the first wall 11A.

The first wall 11A is a side wall of the valve body 11 in which the first through hole 112A is provided, and it is understood that the first wall 11A may be perpendicular to the first direction X.

In embodiments where the valve body 11 includes the valve housing 111 first end cap 112 and the second end cap 113, the first wall 11A may be the first end cap 112 and the first through hole 112A may be provided on the first end cap 112.

The first seal 14 is a member for filling the gap between the valve element 12 and the first wall 11A to reduce the risk of leakage of the electrolyte.

The first seal 14 may be a sealing ring or a gasket, for example.

A seal ring is a seal element for reducing the risk of liquid or gas leakage. The seal ring is generally made of soft, wear-resistant and corrosion-resistant materials, such as rubber, polyurethane, fluororubber and the like, and has good elasticity and sealing performance.

A gasket is a sealing element for filling and sealing a gap between two objects, typically for reducing the risk of leakage of liquid, gas or solid particles. The gasket is typically made of a soft, abrasion-resistant, corrosion-resistant material, such as rubber, polyurethane, plastic, metal, etc., with good elastic and sealing properties.

The "gap between the valve body 12 and the first wall 11A" may be understood as a gap between the body 122 of the valve body 12 and the first wall 11A in the first direction X when the valve body 12 seals the first through hole 112A.

In the above-described solution, the first seal 14 closes the gap between the valve core 12 and the first wall 11A, thereby reducing the risk of fluid flowing out of the accommodation chamber 11C from the first through hole 112A when the valve core 12 closes the first through hole 112A.

Referring to fig. 1 and 2, and further referring to fig. 3 and 4, fig. 3 is a schematic structural diagram of a valve core 12 according to some embodiments of the present application, and fig. 4 is an enlarged view of a portion a in fig. 2. The body 122 includes a first portion 122A and a second portion 122B sequentially arranged along the first direction X, and the first portion 122A is connected to the guide 121. The second portion 122B protrudes from the outer peripheral surface of the first portion 122A in the radial direction of the spool 12 to form a first stepped surface 122D between the second portion 122B and the first portion 122A. The first sealing member 14 is sleeved on the first portion 122A and abuts against the first step surface 122D.

The first portion 122A is a portion of the body 122 for connecting the guide 121; the second portion 122B is a portion of the body 122 for compressing the first seal 14 in cooperation with the first wall 11A.

The first portion 122A and the second portion 122B may be connected by welding or may be fixed to each other by integral molding.

The first step surface 122D is a portion of the side surface of the second portion 122B facing the first wall 11A, which does not overlap with the orthographic projection of the first portion 122A on the side surface.

It will be appreciated that the guide 121, the first portion 122A and the second portion 122B may be coaxially arranged, or that the respective axes of the guide 121, the first portion 122A and the second portion 122B may have a certain eccentricity therebetween.

In the embodiment in which the first portion 122A and the second portion 122B are coaxially disposed, "the second portion 122B protrudes from the outer peripheral surface of the first portion 122A in the radial direction of the spool 12" is understood to mean that the radial dimension of the second portion 122B is larger than the radial dimension of the first portion 122A.

In embodiments in which there is some eccentricity between the respective axes of the first and second portions 122A, 122B, "the second portion 122B protrudes from the outer circumferential surface of the first portion 122A in the radial direction of the spool 12" is understood to mean that the orthographic projection of the first portion 122A is located entirely within the orthographic projection of the second portion 122B on a plane perpendicular to the first direction X.

The first sealing member 14 is sleeved on the first portion 122A and abuts against the first step surface 122D, so that when the valve core 12 seals the first through hole 112A through the first sealing member 14, the first sealing member 14 is located between the first step surface 122D and the first wall 11A along the first direction X. That is, the elastic force provided by the first elastic member 13 can be transmitted to the first sealing member 14 through the first stepped surface 122D, so that the first wall 11A and the first stepped surface 122D press the first sealing member 14, thereby enabling the first sealing member 14 to sufficiently fill the gap between the first stepped surface 122D and the first wall 11A, which is advantageous in improving the reliability of the check valve 10.

Referring to fig. 1 and 2, and further referring to fig. 3 and 4, according to some embodiments of the present application, the guide portion 121 protrudes from the outer circumferential surface of the first portion 122A along the radial direction of the valve core 12, so as to form a second step surface 122E between the guide portion 121 and the first portion 122A. In the first direction X, the first seal 14 is located between the first step surface 122D and the second step surface 122E.

The second step surface 122E is a portion of the guide 121 facing the side surface of the second portion 122B, which does not overlap with the orthographic projection of the first portion 122A on the side surface.

In the embodiment in which the guide portion 121 and the first portion 122A are coaxially disposed, "the guide portion 121 protrudes from the outer circumferential surface of the first portion 122A in the radial direction of the valve body 12" is understood to mean that the radial dimension of the side surface of the guide portion 121 to which the first portion 122A is connected is larger than the radial dimension of the first portion 122A.

In an embodiment in which there is a certain eccentricity between the respective axes of the guide portion 121 and the first portion 122A, "the guide portion 121 protrudes from the outer peripheral surface of the first portion 122A in the radial direction of the spool 12" can be understood as that the orthographic projection of the first portion 122A is located entirely within the orthographic projection of the guide portion 121 on a plane perpendicular to the first direction X.

In the above-mentioned solution, the first sealing member 14 is located between the first step surface 122D and the second step surface 122E, so that the first step surface 122D and the second step surface 122E form a structural limit on the first sealing member 14, which reduces the risk of the first sealing member 14 moving relatively to the first portion 122A along the first direction X when the valve core 12 moves along the first direction X, and improves the reliability of the check valve 10.

Referring to fig. 1 and 2, and further referring to fig. 3 and 5, fig. 5 is an enlarged view of a portion B of fig. 2 according to some embodiments of the present application. The body 122 also includes a third portion 122C. The first portion 122A, the second portion 122B, and the third portion 122C are arranged in this order along the first direction X. The second portion 122B protrudes from the outer peripheral surface of the third portion 122C in the radial direction of the spool 12 to form a third stepped surface 122F between the second portion 122B and the third portion 122C. One end of the first elastic member 13 is sleeved outside the third portion 122C and abuts against the third step surface 122F.

The third portion 122C is a portion of the body 122 for connecting the first elastic member 13.

The third portion 122C and the second portion 122B may be connected by welding or may be fixed to each other by integral molding.

The third step surface 122F is a portion of the side surface of the second portion 122B facing away from the first wall 11A, which does not overlap with the orthographic projection of the third portion 122C on the side surface.

It will be appreciated that the third portion 122C and the second portion 122B may be coaxially disposed, or that the respective axes of the third portion 122C and the second portion 122B may have a degree of eccentricity therebetween.

In the embodiment in which the third portion 122C and the second portion 122B are coaxially disposed, "the second portion 122B protrudes from the outer peripheral surface of the third portion 122C in the radial direction of the spool 12" may be understood as that the radial dimension of the second portion 122B is larger than the radial dimension of the third portion 122C.

In embodiments in which there is some eccentricity between the respective axes of the first and second portions 122A, 122B, "the second portion 122B protrudes from the outer circumferential surface of the third portion 122C in the radial direction of the spool 12" may be understood as that the orthographic projection of the third portion 122C is located entirely within the orthographic projection of the second portion 122B on a plane perpendicular to the first direction X.

One end of the first elastic member 13 is sleeved outside the third portion 122C and abuts against the third step surface 122F. So that the third step surface 122F plays a structural limiting role on one end of the first elastic member 13, thereby reducing the risk of the first elastic member 13 moving relative to the valve core 12 along the first direction X when the valve core 12 is far away from the first through hole 112A along the first direction X, and improving the reliability of the check valve 10.

Referring to fig. 1 and 2, according to some embodiments of the present application, along a first direction X, the valve body 11 has a second wall 11B opposite to the first wall 11A, and the second through hole 113A is disposed on the second wall 11B. Both ends of the first elastic member 13 are connected to the spool 12 and the second wall 11B, respectively.

The second wall 11B is a side wall of the valve body 11 in which the second through hole 113A is provided, and it is understood that the second wall 11B may be perpendicular to the first direction X.

In embodiments where the valve body 11 includes the valve sleeve 111, the first end cap 112, and the second end cap 113, the second wall 11B may be the second end cap 113, and the second through hole 113A may be provided on the second end cap 113.

In some embodiments, the valve body 11 includes a valve housing 111, a first end cap 112, and a second end cap 113. In the first direction X, the valve housing 111 has first and second openings at both ends of the valve housing 111, respectively, and first and second end caps 112 and 113 cover the first and second openings, respectively. The first wall 11A is a first end cap 112, and the second wall 11B is a second end cap 113. The first end cap 112, the second end cap 113 and the valve housing 111 are coaxially disposed and enclose to form the accommodating chamber 11C. The second end cap 113 has a first groove 113B on a side surface of the second end cap 113 inside the accommodating chamber 11C, and the first groove 113B is wound around an outer peripheral side of the second through hole 113A and is configured to accommodate an end of the first elastic member 13 away from the valve core 12. To structurally limit the first elastic member 13. Thereby reducing the risk of relative movement of the end phase of the first spring member 13 remote from the valve core 12 and the valve sleeve 111 in the radial direction of the valve core 12.

In the above technical solution, the first wall 11A and the second wall 11B are oppositely disposed along the first direction X, and two ends of the first elastic member 13 are respectively connected with the valve core 12 and the second wall 11B, so that the direction of the elastic force provided by the first elastic member 13 is parallel to the first direction X, the risk that the guide portion 121 cannot be effectively driven into the first through hole 112A due to the deviation of the elastic force from the first direction X is reduced, and the reliability of the one-way valve 10 is improved.

Referring to fig. 6 and fig. 7, fig. 6 is a cross-sectional view of the infusion pump 100 when the volume of the pump chamber 20A of the infusion pump 100 is the minimum according to some embodiments of the present application, and fig. 7 is a cross-sectional view of the infusion pump 100 when the volume of the pump chamber 20A of the infusion pump 100 is the maximum according to some embodiments of the present application. The embodiment of the application provides a liquid injection pump 100 for injecting electrolyte into a battery cell, wherein the liquid injection pump 100 comprises a pump body 20, a pump core 30, a first check valve 10A and a second check valve 10B. Wherein the first check valve 10A and the second check valve 10B are the check valve 10 provided in any one of the embodiments described above. The pump body 20 has a pump cavity 20A, and at least a portion of the pump core 30 is disposed within the pump body 20. The first through hole 112A of the first check valve 10A and the second through hole 113A of the second check valve 10B are both in communication with the pump chamber 20A.

The electrolyte includes an electrolyte salt and a solvent.

In some embodiments, the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis-fluorosulfonyl imide, lithium bis-trifluoromethanesulfonyl imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalato borate, lithium difluorodioxaato phosphate, and lithium tetrafluorooxalato phosphate.

In some embodiments, the solvent may include at least one of ethylene carbonate, propylene carbonate, methylethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methylpropyl carbonate, ethylpropyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1, 4-butyrolactone, sulfolane, dimethyl sulfone, methyl sulfone, and diethyl sulfone. The solvent may also be selected from ether solvents. The ether solvent may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1, 3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether, and crown ether.

The pump body 20 is a main body portion of the liquid filling pump 100, and is a member for accommodating other components.

In some embodiments, the pump body 20 includes a pump sleeve 21 and a third end cap 22. Along the second direction Y, the pump sleeve 21 has a third opening, the third opening is sealed by a third end cover 22, and the joint between the pump sleeve 21 and the third end cover 22 is sealed by a sealing ring. The pump body 20 is designed in a split type, so that parts such as the pump core 30 and the like are conveniently placed in the pump body 20, the manufacturing difficulty of the pump body 20 is reduced, and the production cost of the pump body 20 is reduced.

The pump body 20 may further have a first flow passage 20B therein, and the pump chamber 20A may communicate with the first through hole 112A of the first check valve 10A and the second through hole 113A of the second check valve 10B through the first flow passage 20B.

In embodiments in which the pump body 20 includes the pump housing 21 and the third end cap 22, the first flow passage 20B may be provided at the third end cap 22, and the first check valve 10A and the second check valve 10B are connected to the third end cap 22.

Pump core 30 is a component of infusion pump 100 that controls the volume of pump chamber 20A. Referring to fig. 6 and 7, the pump core 30 reciprocates in the second direction Y so that the volume of the pump chamber 20A increases or decreases.

Alternatively, the pump core 30 may be made of a ceramic material. So that the hardness of the pump core 30 is increased to improve the wear resistance of the pump core 30, thereby reducing the risk of the pump core 30 from generating debris to wear the pump body 20.

The second direction Y may be parallel to the axis of the pump core 30 and/or parallel to the direction of movement of the pump core 30.

In some embodiments, the first check valve 10A and the second check valve 10B are located on opposite sides of the pump chamber 20A, respectively, and the first through hole 112A of the first check valve 10A and the second through hole 113A of the second check valve 10B are coaxially disposed.

As will be appreciated, with reference to fig. 7, as the pump core 30 moves in the second direction Y such that the volume of the pump chamber 20A increases, the pressure within the pump chamber 20A and the first flow passage 20B becomes smaller, so that the spools 12 of the first check valve 10A and the second check valve 10B are both subjected to pressure in the first direction X near the first flow passage 20B.

Wherein, since the direction of the pressure is the same as the direction of the elastic force provided by the first elastic member 13 in the first check valve 10A, the valve body 12 of the first check valve 10A closes the first through hole 112A of the first check valve 10A.

Since the direction of the pressure is opposite to the direction of the elastic force provided by the first elastic member 13 in the second check valve 10B, when the pressure is greater than the elastic force provided by the first elastic member 13, the valve body 12 of the second check valve 10B opens the first through hole 112A of the second check valve 10B. So that the electrolyte passes through the second check valve 10B into the pump chamber 20A.

Referring to fig. 6, when the pump core 30 moves in the second direction Y so that the volume of the pump chamber 20A decreases, the pressures in the pump chamber 20A and the first flow passage 20B become large, so that the spools 12 of the first check valve 10A and the second check valve 10B are both subjected to pressure in the first direction X away from the first flow passage 20B.

Wherein, since the direction of the pressure is opposite to the direction of the elastic force provided by the first elastic member 13 in the first check valve 10A, when the pressure is greater than the elastic force provided by the first elastic member 13, the valve body 12 of the first check valve 10A opens the first through hole 112A of the first check valve 10A. So that the electrolyte flows out of the pump chamber 20A through the first check valve 10A.

Since the direction of the pressure is the same as the direction of the elastic force provided by the first elastic member 13 in the second check valve 10B, the spool 12 of the second check valve 10B closes the first through hole 112A of the second check valve 10B.

In summary, by the reciprocating movement of the pump core 30 along the second direction Y, the injection pump 100 provided by the present application can be completed, and the electrolyte is extracted through the first through hole 112A of the second one-way valve 10B and discharged through the second through hole 113A of the second one-way valve 10B, so as to complete the operation of injecting the electrolyte into the battery cell in cooperation with the injection head.

In the above solution, since the infusion pump 100 has the check valve 10 in the embodiment of the first aspect, the infusion pump 100 also has the advantageous effects in the embodiment of the first aspect. Specifically, the valve body 12 of the check valve 10 in the liquid injection pump 100 includes a guide portion 121 for entering the first through hole 112A, and the cross-sectional area of the guide portion 121 gradually decreases in a direction away from the body 122. So that the guide portion 121 can guide the valve body 12 so that the valve body 12 can seal the first through hole 112A. Thereby eliminating the need to add a guide part in the accommodating chamber 11C, thereby reducing the number of parts of the check valve 10, and thus reducing the production cost of the check valve 10. Thereby reducing the manufacturing costs of the infusion pump 100.

Meanwhile, as the check valve 10 in the liquid injection pump 100 guides through the guide part 121 of the valve core 12, the guide piece is removed, so that the solvent of the electrolyte is evaporated due to heat generated by friction when the guide piece moves relative to the accommodating cavity 11C, and the solute of the electrolyte is precipitated and crystallized. So that the movement of the valve core 12 and the guide is at risk of being affected.

According to some embodiments of the present application, referring to fig. 6 and referring to fig. 7, the pump core 30 has a first end surface 31 and a second end surface 32 disposed opposite to each other in a movement direction of the pump core 30, and a first circumferential surface 33 connecting the first end surface 31 and the second end surface 32. The first peripheral surface 33 includes a first region 331, and the first region 331 is located outside the pump body 20 when the volume of the pump chamber 20A is maximized. The infusion pump 100 further includes a covering member 40, the covering member 40 covering at least the first region 331.

The first end surface 31 and the second end surface 32 are two end surfaces of the pump core 30 that are disposed opposite to each other in the second direction Y.

The first peripheral surface 33 is a surface for connecting the first end surface 31 and the second end surface 32 in the pump core 30.

As shown in fig. 7, the first region 331 is a region where the first peripheral surface 33 is located outside the pump body 20 when the volume of the pump chamber 20A reaches the maximum.

The covering member 40 is a member of the infusion pump 100 that covers the first area 331 and serves to protect the pump core 30.

In embodiments where the pump core 30 is made of a ceramic material, the covering 40 may be made of a flexible material such as polyurethane, plastic, metal, etc., to absorb external forces and protect the portion of the pump core 30 that is exposed to the exterior of the pump body 20 during movement.

In the above technical solution, the covering member 40 at least covers the first area 331, so that the covering member 40 can protect the portion of the pump core 30 exposed outside the pump body 20 during the pumping process of the infusion pump 100, thereby reducing the risk of damaging the pump core 30 when bearing external force.

According to some embodiments of the present application, referring to fig. 6 and fig. 7, when the volume of the pump chamber 20A reaches the maximum, the first end surface 31 is located outside the pump body 20, and the cladding member 40 wraps the first end surface 31.

In the above technical solution, the wrapping member 40 wraps the first end face 31, so that during the pumping process of the injection pump 100, the wrapping member 40 can protect the portion of the pump core 30 exposed outside the pump body 20, thereby reducing the risk of damaging the pump core 30 when bearing external force.

According to some embodiments of the present application, referring to fig. 6 and referring to fig. 7, the pump body 20 includes a first cavity 21A and a second cavity 21B arranged along a movement direction of the pump core 30. The second end surface 32 surrounds at least a portion of the inner wall of the first chamber 21A to form the pump chamber 20A. In the radial direction of the pump core 30, the radial dimension of the first cavity 21A is smaller than the radial dimension of the second cavity 21B, and a portion of the cladding 40 is located between the inner peripheral surface of the second cavity 21B and the first peripheral surface 33.

The first cavity 21A is a cavity in the pump body 20 for communicating with the first through hole 112A of the first check valve 10A and the second through hole 113A of the second check valve 10B; the second cavity 21B is a cavity in the pump body 20 that communicates with the first cavity 21A.

In some embodiments, the first cavity 21A and the second cavity 21B are coaxially disposed, and an axial direction of the first cavity 21A is parallel to the second direction Y to facilitate movement of the pump core 30 and the cladding 40 in the second direction Y.

In the embodiment in which the pump body 20 includes the pump housing 21 and the third end cap 22, the first cavity 21A and the second cavity 21B are located within the pump housing 21, and the pump housing 21 has a third opening and a fourth opening located at both ends of the pump housing 21, respectively, in the second direction Y, the third opening being in communication with the first cavity 21A, and the fourth opening being in communication with the second cavity 21B. The first flow passage 20B is disposed at the third end cap 22, the first check valve 10A and the second check valve 10B are connected with the third end cap 22, and the third end cap 22 seals the third opening, and the first flow passage 20B is in communication with the first cavity 21A.

In the above technical solution, a portion of the covering member 40 is located between the inner peripheral surface of the second cavity 21B and the first peripheral surface 33, so that the covering member 40 can cooperate with the inner peripheral surface of the second cavity 21B to isolate the outside from the second cavity 21B, thereby reducing the risk of foreign matters entering the second cavity 21B to affect the movement of the pump core 30.

Referring to fig. 8, fig. 8 is a cross-sectional view of an priming device 1000 provided in some embodiments of the present application. An embodiment of the present application provides a priming device 1000 for injecting an electrolyte into a battery cell, where the priming device 1000 includes a priming pump (not shown in the drawings), a case 200, a liquid outlet tube 400, a liquid inlet tube 300, and a driving assembly 500 provided in any one of the embodiments above. The case 200 is used to house the infusion pump 100. The outlet pipe 400 is used for connecting a second through hole (not shown) of the first check valve (not shown). The liquid inlet pipe 300 is used for connecting a first through hole (not shown) of a second check valve (not shown). At least a portion of the drive assembly 500 is disposed within the housing 200 and is coupled to a pump core (not shown) of a fluid infusion pump (not shown), the drive assembly 500 being configured to drive the pump core (not shown) in a reciprocating motion.

The housing 200 is a component of the priming device 1000 that houses a priming pump and at least a portion of the drive assembly 500.

Alternatively, the case 200 may be made of a material having a certain hardness and strength (e.g., aluminum alloy), so that the case 200 is not easily deformed when it is impacted by the pressing, which is advantageous in reducing the damage to the injection device 1000 caused by the impact of the external force.

The liquid inlet pipe 300 is a pipe connecting the electrolyte storage device with a first through hole (not shown) of a second check valve (not shown).

The liquid outlet pipe 400 is a pipe body of a second through hole (not shown) connecting the injection head and the first one-way valve (not shown).

The driving assembly 500 is used to reciprocate a pump core (not shown) in a second direction (not shown). The drive assembly 500 may be a hydraulic cylinder, an air cylinder, a motor, or the like.

In embodiments where the infusion pump (not shown) includes a covering (not shown), the drive assembly 500 is coupled to the covering (not shown) for reciprocating the pump core (not shown) in a second direction (not shown).

In the above technical solution, since the liquid injection pump is contained in the case 200, the case 200 can reduce the contact between the liquid injection pump (not shown in the figure) and the outside air, thereby reducing the risk of affecting the movement of the pump core (not shown in the figure) due to the precipitation of crystals of the electrolyte on the surface of the pump core (not shown in the figure) of the liquid injection pump (not shown in the figure).

An embodiment of the present application provides a battery production line, including the priming device 1000 provided in any one of the embodiments above.

Referring to fig. 1-5, an embodiment of the present application provides a check valve 10 including a valve body 11, a valve core 12, a first elastic member 13, and a first sealing member 14.

The valve body 11 includes a valve housing 111, a first end cap 112 and a second end cap 113. In the first direction X, the valve housing 111 has first and second openings at both ends of the valve housing 111, respectively, and first and second end caps 112 and 113 cover the first and second openings, respectively. The first wall 11A is a first end cap 112, and the second wall 11B is a second end cap 113. The first end cap 112, the second end cap 113 and the valve housing 111 are coaxially disposed and enclose to form the accommodating chamber 11C.

The valve body 11 has a first through hole 112A and a second through hole 113A communicating with the accommodation chamber 11C. The first through hole 112A is disposed on the first wall 11A, and the second through hole 113A is disposed on the second wall 11B, wherein the first through hole 112A is a liquid inlet hole, and the second through hole 113A is a liquid outlet hole.

The valve core 12 is disposed in the accommodating chamber 11C, and the valve core 12 is used for closing or opening the first through hole 112A. The valve spool 12 includes a body 122 and a guide portion 121 for entering the first through hole 112A, the guide portion 121 being provided at one end of the body 122 in the first direction X. The guide portion 121 has a truncated cone shape, and the cross-sectional area of the guide portion 121 gradually decreases in a direction away from the body 122.

The body 122 includes first and second portions 122A and 122B and a third portion 122C arranged in sequence along the first direction X. Along the radial direction of the valve body 12, the second portion 122B protrudes from the outer peripheral surface of the first portion 122A to form a first stepped surface 122D between the second portion 122B and the first portion 122A, the guide 121 protrudes from the outer peripheral surface of the first portion 122A to form a second stepped surface 122E between the guide 121 and the first portion 122A, and the second portion 122B protrudes from the outer peripheral surface of the third portion 122C to form a third stepped surface 122F between the second portion 122B and the third portion 122C.

The first seal 14 is sleeved on the first portion 122A, and along the first direction X, the first seal 14 is located between the first step surface 122D and the second step surface 122E. The first seal 14 is for sealing a gap between the spool 12 and the first wall 11A.

One end of the first elastic member 13 is sleeved outside the third portion 122C and abuts against the third step surface 122F.

The second end cap 113 has a first groove 113B on a side surface of the second end cap 113 inside the accommodating chamber 11C, and the first groove 113B is wound around an outer peripheral side of the second through hole 113A and is configured to accommodate an end of the first elastic member 13 away from the valve core 12.

The first elastic member 13 is used for providing elastic force to the valve core 12 so as to drive the valve core 12 to move towards the first through hole 112A.

In the above-mentioned technical solution, the guiding portion 121 is in a truncated cone shape, and the cross-sectional area of the guiding portion 121 gradually decreases along the direction away from the body 122. So that the guide portion 121 can guide the valve body 12 so that the valve body 12 can seal the first through hole 112A. Thereby eliminating the need to add a guide part in the accommodating chamber 11C, thereby reducing the number of parts of the check valve 10, and thus reducing the production cost of the check valve 10. Thereby reducing the manufacturing costs of the infusion pump 100.

Meanwhile, as the guide part 121 of the check valve 10 through the valve core 12 guides, the guide part is removed, so that the solvent of the electrolyte is evaporated due to heat generated by friction when the guide part moves relative to the accommodating cavity 11C, and the solute of the electrolyte is precipitated and crystallized. So that the movement of the valve core 12 and the guide is at risk of being affected.

Referring to fig. 6 and 7, an embodiment of the present application provides a liquid injection pump 100 for injecting electrolyte into a battery cell, wherein the liquid injection pump 100 includes a pump body 20, a pump core 30, a first check valve 10A, a second check valve 10B, and a covering member 40. Wherein the first check valve 10A and the second check valve 10B are both check valves 10 provided in the above-described embodiment.

The pump body 20 has a pump cavity 20A, and at least a portion of the pump core 30 is disposed within the pump body 20. The first through hole 112A of the first check valve 10A and the second through hole 113A of the second check valve 10B are both in communication with the pump chamber 20A through the first flow passage 20B.

The pump body 20 comprises a pump sleeve 21 and a third end cover 22, a first cavity 21A and a second cavity 21B which are sequentially arranged along a second direction Y are arranged in the pump sleeve 21, the pump sleeve 21 is provided with a third opening and a fourth opening which are respectively positioned at two ends of the pump sleeve 21, the third opening is communicated with the first cavity 21A, and the fourth opening is communicated with the second cavity 21B. The first flow passage 20B is disposed at the third end cap 22, the first check valve 10A and the second check valve 10B are connected with the third end cap 22, and the third end cap 22 seals the third opening, and the first flow passage 20B is in communication with the first cavity 21A.

The pump core 30 has a first end face 31 and a second end face 32 that are disposed opposite to each other in the direction of movement of the pump core 30, and a first peripheral face 33 that connects the first end face 31 and the second end face 32.

The second end surface 32 is located in the first cavity 21A and surrounds at least part of the inner wall of the first cavity 21A to form the pump cavity 20A.

The first circumferential surface 33 includes a first region 331, and when the volume of the pump chamber 20A is maximized, the first region 331 and the first end surface 31 are located outside the pump body 20, and the coating member 40 coats the first end surface 31 and the first region 331.

In the radial direction of the pump core 30, the radial dimension of the first cavity 21A is smaller than the radial dimension of the second cavity 21B, and a portion of the cladding 40 is located between the inner peripheral surface of the second cavity 21B and the first peripheral surface 33.

In the above technical solution, a portion of the covering member 40 is located between the inner peripheral surface of the second cavity 21B and the first peripheral surface 33, so that the covering member 40 can block the fourth opening to a certain extent, thereby isolating the outside world from the second cavity 21B, and reducing the risk of foreign matters entering the second cavity 21B to affect the movement of the pump core 30.

Please refer to fig. 8. An embodiment of the present application provides a priming device 1000 for injecting electrolyte into a battery cell, where the priming device 1000 includes a priming pump 100 (not shown in the drawings), a case 200, a liquid outlet tube 400, a liquid inlet tube 300, and a driving assembly 500. The case 200 is used to house the infusion pump 100. The outlet pipe 400 is used for connecting a second through hole (not shown) of the first check valve 10A (not shown). The liquid inlet pipe 300 is used for connecting a first through hole (not shown) of a second check valve (not shown). At least a portion of the drive assembly 500 is disposed within the housing 200 and is coupled to a pump core (not shown) of a fluid infusion pump (not shown), the drive assembly 500 being configured to drive the pump core (not shown) in a reciprocating motion.

It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other.

The above embodiments are only for illustrating the technical solution of the present application, and are not intended to limit the present application, and various modifications and variations of the present application will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (12)

1. A one-way valve for controlling one-way flow of an electrolyte, comprising:

The valve body is provided with a containing cavity, the valve body is provided with a first through hole and a second through hole which are communicated with the containing cavity, the first through hole is a liquid inlet hole, and the second through hole is a liquid outlet hole;

The valve core is arranged in the accommodating cavity and used for closing or opening the first through hole, the valve core comprises a body and a guide part used for entering the first through hole, the guide part is arranged at one end of the body in a first direction, and the cross section area of the guide part is gradually reduced along the direction deviating from the body;

The first elastic piece is arranged in the accommodating cavity and is used for providing elastic force for the valve core so as to drive the valve core to move towards the first through hole.

2. The one-way valve of claim 1, wherein the valve body has a first wall, the first through-hole being provided in the first wall;

the check valve further includes a first seal for sealing a gap between the valve spool and the first wall.

3. The one-way valve of claim 2, wherein the body includes a first portion and a second portion arranged in sequence along the first direction, the first portion being connected to the guide;

The second part protrudes from the outer peripheral surface of the first part along the radial direction of the valve core so as to form a first step surface between the second part and the first part;

the first sealing piece is sleeved on the first part and is abutted with the first step surface.

4. The check valve according to claim 3, wherein the guide portion protrudes from an outer peripheral surface of the first portion in a radial direction of the valve body to form a second stepped surface between the guide portion and the first portion;

In the first direction, the first seal is located between the first step surface and the second step surface.

5. The one-way valve of claim 3, wherein the body further comprises a third portion, the first portion, the second portion, and the third portion being arranged in sequence along the first direction;

The second part protrudes from the outer peripheral surface of the third part along the radial direction of the valve core so as to form a third step surface between the second part and the third part;

One end of the first elastic piece is sleeved outside the third part and is abutted with the third step surface.

6. The one-way valve of claim 2, wherein in the first direction, the valve body has a second wall disposed opposite the first wall, the second through-hole being disposed in the second wall;

and two ends of the first elastic piece are respectively connected with the valve core and the second wall.

7. An injection pump for injecting an electrolyte into a battery cell, comprising:

A pump body having a pump cavity;

a pump core, at least a portion of which is disposed within the pump body;

A first one-way valve and a second one-way valve, both of which are the one-way valves of any one of claims 1-6;

the first through hole of the first one-way valve and the second through hole of the second one-way valve are communicated with the pump cavity.

8. The infusion pump of claim 7, wherein said pump core has a first end face and a second end face disposed opposite each other along a direction of movement of said pump core, and a first peripheral face connecting said first end face and said second end face;

The first periphery comprises a first area, and when the volume of the pump cavity reaches the maximum, the first area is positioned outside the pump body;

The infusion pump also includes a covering that covers at least the first region.

9. The infusion pump of claim 8, wherein said first end face is located outside of said pump body when the volume of said pump chamber is maximized, and wherein said cladding member cladding said first end face.

10. The infusion pump of claim 8, wherein the pump body includes a first cavity and a second cavity arranged along a direction of movement of the pump core, the second end surface surrounding at least a portion of an inner wall of the first cavity to form the pump cavity;

the radial dimension of the first cavity is smaller than the radial dimension of the second cavity along the radial direction of the pump core, and the part of the cladding piece is positioned between the inner peripheral surface of the second cavity and the first peripheral surface.

11. A liquid injection device for injecting an electrolyte into a battery cell, comprising:

The infusion pump of any one of claims 7-10;

The box body is used for accommodating the liquid injection pump;

the liquid outlet pipe is used for connecting the second through hole of the first one-way valve;

the liquid inlet pipe is used for connecting the first through hole of the second one-way valve;

And the driving assembly is at least partially arranged in the box body and connected with the pump core of the liquid injection pump, and is configured to drive the pump core to reciprocate.

12. A battery production line comprising the liquid injection device according to claim 11.