Lithium ion battery electrolyte injection machine

Abstract

The utility model discloses a lithium ion battery electrolyte filling machine, which comprises a filling cylinder and a first blocking structure, a piston is slidably mounted in the filling cylinder, a push-pull rod is arranged at the top end of the piston, a filling needle is arranged at the bottom end of the piston, and the first blocking structure is arranged on the filling needle. The first blocking structure comprises at least two first elastic valves which are arranged at the bottom end of the inner side wall of the liquid injection cylinder and distributed in the circumferential direction of the liquid injection cylinder, each first elastic valve is provided with a first blocking part, and in the natural state, the close sides of every two adjacent first blocking parts are attached to each other, and the first elastic valves are arranged in the circumferential direction of the liquid injection cylinder. And when the piston slides downwards, the electrolyte in the electrolyte injection barrel can apply pressure to the first blocking parts, so that the first blocking parts generate elastic deformation capable of enabling the tail ends of all the first blocking parts to be separated from one another. According to the electrolyte injection machine for the lithium ion battery, residual electrolyte in the electrolyte injection cylinder can be prevented from dripping from the electrolyte injection needle after electrolyte injection is completed.

Description

Technical Field

[0001] The utility model relates to lithium ion battery processing equipment, in particular to a lithium ion battery electrolyte injection machine. Background Art

[0002] An electrolyte injection machine is a device used to inject electrolyte into lithium-ion batteries. It primarily consists of an injection barrel, within which a piston slides. A push-pull rod is attached to the top of the piston, and an injection needle is located at the bottom of the barrel. During use, the needle is inserted into the lithium-ion battery, and the piston is then pushed downward using the push-pull rod. The piston then injects the electrolyte from the barrel into the battery.

[0003] Although the existing electrolyte injection machine can perform injection, it has the following disadvantages: after the injection is completed, the electrolyte remaining in the injection cylinder is easy to drip from the injection needle, which not only causes the waste of electrolyte, but also the electrolyte is corrosive and volatile, which can easily affect the working environment. Utility Model Content

[0004] The present invention aims to solve at least one of the technical problems in the prior art. To this end, the present invention provides a lithium-ion battery electrolyte injection machine that can prevent residual electrolyte in the injection cylinder from dripping from the injection needle after injection is completed.

[0005] The lithium-ion battery electrolyte injection machine according to the embodiment of the present invention includes:

[0006] An injection cylinder, wherein a piston is slidably mounted in the injection cylinder, a push-pull rod is provided at the top end of the piston, and an injection needle is provided at the bottom end of the piston;

[0007] A first barrier structure includes at least two first elastic valves provided at the bottom end of the inner side wall of the injection cylinder and distributed along the circumference of the injection cylinder, wherein the first elastic valves are provided with a first barrier portion;

[0008] Wherein, in a natural state, the adjacent sides of two adjacent first barrier portions are in contact with each other, and the ends of all the first barrier portions are in contact with each other;

[0009] When the piston slides downward, the electrolyte in the injection cylinder can exert pressure on the first blocking portion, causing the first blocking portion to generate elastic deformation that can separate the ends of all the first blocking portions from each other.

[0010] The lithium-ion battery electrolyte injection machine according to the embodiment of the present invention has at least the following beneficial effects:

[0011] When using the lithium-ion battery electrolyte injection machine of the present invention, an injection needle is inserted into the lithium-ion battery. The piston is then controlled to slide downward by a push-pull rod. The piston pushes the electrolyte in the injection barrel downward. The electrolyte in the injection barrel applies pressure to the first barrier portion, causing all the first barrier portions to produce elastic deformation, thereby separating the ends of all the first barrier portions from each other to form an opening. The electrolyte can then pass through the opening and enter the injection needle, and finally be injected into the lithium-ion battery through the injection needle. After the injection is completed, the piston is controlled to slide upward by the push-pull rod. The first barrier portions are no longer subject to external pressure and can return to their natural state. In the natural state, the adjacent sides of two adjacent first barrier portions are in contact, and the ends of all the first barrier portions are in contact, thereby isolating the injection needle from the inner cavity of the injection barrel, preventing residual electrolyte in the injection barrel from dripping from the injection needle.

[0012] According to some embodiments of the present invention, in a natural state, the first barrier portion extends downward and close to the center line of the injection cylinder, so that all surfaces of the first barrier portion close to the center line of the injection cylinder are enclosed to form a first conical groove.

[0013] According to some embodiments of the present invention, the bottom end of the injection cylinder is through-set, the top end of the injection needle is connected to a mounting portion, the outer wall of the mounting portion is threadedly connected to the inner wall of the bottom end of the injection cylinder, and the mounting portion is provided with a through hole connecting the injection needle and the injection cylinder.

[0014] According to some embodiments of the present invention, the inner side wall of the injection cylinder is provided with a first flange, the first elastic valve is provided with a first connecting portion, the first blocking portion is connected to the first connecting portion, and the first connecting portion is clamped between the mounting portion and the first flange.

[0015] According to some embodiments of the present invention, the adjacent sides of two first connecting parts are in contact with each other.

[0016] According to some embodiments of the present invention, a top surface of the mounting portion is provided with a clearance groove communicating with the through hole, and the first blocking portion is received in the clearance groove.

[0017] According to some embodiments of the present invention, a liquid inlet pipe is provided on the side wall of the liquid injection cylinder, and the liquid inlet pipe is used to connect to an external electrolyte storage device.

[0018] According to some embodiments of the present invention, the side wall of the liquid injection cylinder is provided with a liquid inlet joint, the liquid inlet pipe is connected to the liquid inlet joint, and a second barrier structure is provided in the liquid inlet joint, the second barrier structure includes at least two second elastic valves provided on the inner side wall of the liquid inlet joint and distributed along the circumference of the liquid inlet joint, and the second elastic valve is provided with a second barrier part; wherein, in a natural state, the sides of two adjacent second barrier parts that are close to each other are in contact, and the ends of all the second barrier parts are in contact; when the piston slides upward, the negative pressure formed in the liquid injection cylinder acts on the second barrier part, causing the second barrier part to produce an elastic deformation that can separate the ends of all the second barrier parts from each other.

[0019] According to some embodiments of the present invention, in a natural state, the second barrier portion extends in a direction close to the center line of the liquid injection cylinder and close to the center line of the liquid inlet connector, so that all surfaces of the second barrier portion close to the center line of the liquid inlet connector are enclosed to form a second conical groove.

[0020] According to some embodiments of the present invention, a connecting ring is provided on the end rotating sleeve of the liquid inlet pipe, the outer wall of the connecting ring is threadedly connected to the inner wall of the liquid inlet connector, the second elastic valve is provided with a second connecting portion, the second barrier portion is connected to the second connecting portion, the inner wall of the liquid inlet connector is provided with a second flange, and the second connecting portion is clamped between the connecting ring and the second flange.

[0021] According to some embodiments of the present invention, the adjacent sides of two second connecting parts are in contact with each other.

[0022] According to some embodiments of the present invention, a driving portion is provided at the top end of the liquid injection cylinder, and the driving portion is connected to the push-pull rod to control the push-pull rod to move along its own axial direction.

[0023] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0025] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0026] Figure 2 It is a partial cross-sectional view of the utility model;

[0027] Figure 3 It is a schematic diagram of liquid extraction;

[0028] Figure 4This is a schematic diagram of liquid injection.

[0029] Figure Number:

[0030] Injection cylinder 100; piston 101; push-pull rod 102; injection needle 103; mounting portion 104; through hole 105; first flange 106; clearance groove 107; liquid inlet pipe 108; liquid inlet connector 109; connecting ring 110; second flange 111; driving portion 112;

[0031] First barrier structure 200; first elastic valve 201; first barrier portion 202; first tapered groove 203; first connecting portion 204;

[0032] Second barrier structure 300 ; second elastic valve 301 ; second barrier portion 302 ; second tapered groove 303 ; second connecting portion 304 . DETAILED DESCRIPTION

[0033] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0034] In the description of the present invention, it should be understood that descriptions involving orientation, such as the orientation or positional relationship indicated by up, down, etc., are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0035] In the description of this utility model, "a plurality" refers to two or more. The use of "first" or "second" is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features indicated, or implicitly indicating the order of the technical features indicated.

[0036] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0037] Reference below Figures 1 to 4 The invention describes a lithium-ion battery electrolyte injection machine according to an embodiment of the invention.

[0038] like Figures 1 to 4 As shown, the lithium-ion battery electrolyte injection machine according to an embodiment of the present invention includes:

[0039] An injection cylinder 100 is provided with a piston 101 slidably mounted therein. A push-pull rod 102 is provided at the top end of the piston 101 and an injection needle 103 is provided at the bottom end of the piston 101.

[0040] The first barrier structure 200 includes at least two first elastic valves 201 provided at the bottom end of the inner side wall of the injection barrel 100 and distributed along the circumference of the injection barrel 100. The first elastic valves 201 are provided with a first barrier portion 202.

[0041] In the natural state, the adjacent sides of two first barrier portions 202 are in contact with each other, and the ends of all first barrier portions 202 are in contact with each other.

[0042] When the piston 101 slides downward and pushes the electrolyte in the injection cylinder 100 downward, the electrolyte in the injection cylinder 100 can exert pressure on the first blocking portion 202, causing the first blocking portion 202 to produce elastic deformation that can separate the ends of all the first blocking portions 202 from each other.

[0043] When using the lithium-ion battery electrolyte injection machine of the present invention, the injection needle 103 is inserted into the lithium-ion battery, and then the piston 101 is controlled to slide downward by the push-pull rod 102. The piston 101 pushes the electrolyte in the injection cylinder 100 to move downward. The electrolyte in the injection cylinder 100 exerts pressure on the first barrier part 202, causing all the first barrier parts 202 to produce elastic deformation, thereby enabling the ends of all the first barrier parts 202 to separate from each other to form an opening. The electrolyte can pass through the opening and enter the injection needle 103, and finally be injected into the lithium-ion battery through the injection needle 103. After the injection is completed, the piston 101 is controlled to slide upward by the push-pull rod 102, and the first barrier part 202 is not subjected to external pressure, so that it can return to its natural state. In the natural state, the two adjacent first barrier parts 202 are close to each other on one side, and the ends of all the first barrier parts 202 are fitted together, thereby isolating the injection needle 103 and the inner cavity of the injection cylinder 100, preventing the residual electrolyte in the injection cylinder 100 from dripping from the injection needle 103.

[0044] It should be noted that a cylindrical inner cavity can be formed in the axial direction of the injection cylinder 100, and the piston 101 can be a cylindrical structure. The outer wall of the piston 101 fits the inner wall of the injection cylinder 100. When in use, the injection cylinder 100 can be set vertically, and then the piston 101 slides vertically. The push-pull rod 102 extends in the vertical direction, and the push-pull rod 102 is pushed and pulled up and down to achieve the sliding of the piston 101. The first elastic valve 201 can be made of elastic rubber, elastic plastic, or other suitable elastic materials, as long as it can produce elastic deformation and be able to reset.

[0045] In some embodiments of the present invention, Figure 2 As shown, in the natural state, the first blocking portion 202 extends downward and close to the centerline of the injection cylinder 100, so that the surfaces of all the first blocking portions 202 close to the centerline of the injection cylinder 100 enclose a first tapered groove 203. In other words, in the natural state, all the first blocking portions 202 generally form a tapered structure that protrudes downward. With this arrangement, when the piston 101 slides upward, even if the first blocking portion 202 is subjected to negative pressure, it is not easy to produce elastic deformation, and thus can maintain the blocking state, thereby also preventing the residual electrolyte in the injection cylinder 100 from dripping from the injection needle 103. In addition, the surfaces of all the first barrier parts 202 close to the center line of the injection cylinder 100 are enclosed to form a first conical groove 203, and when the piston 101 slides downward, part of the electrolyte will enter the first conical groove 203, making it convenient to apply pressure on the surface of the first barrier part 202 close to the center line of the injection cylinder 100, thereby facilitating the pushing open of the end of the first barrier part 202, and the first conical groove 203 is conical, which has a better effect of pushing open the end of the first barrier part 202, thereby making it better to separate the ends of all the first barrier parts 202 from each other to form an opening.

[0046] In some embodiments of the present invention, Figures 2 to 4 As shown, the bottom of the liquid injection cylinder 100 is provided with, and the top of the liquid injection needle 103 is connected with a mounting portion 104, and the outer sidewall of the mounting portion 104 is threadedly connected to the inner sidewall of the bottom of the liquid injection cylinder 100, and the mounting portion 104 is provided with a through hole 105 that is connected to the liquid injection needle 103 and the liquid injection cylinder 100. When the liquid injection needle 103 needs to be installed, the outer sidewall of the mounting portion 104 is threadedly connected to the inner sidewall of the bottom of the liquid injection cylinder 100, and when the liquid injection needle 103 needs to be disassembled, the mounting portion 104 is unscrewed from the bottom of the liquid injection cylinder 100, and the disassembly and assembly is convenient, and then the liquid injection needle 103 needs to be cleaned, repaired or replaced more conveniently. It should be noted that in some other embodiments of the present invention, the liquid injection needle 103 can also be directly fixedly installed on the bottom of the liquid injection cylinder 100.

[0047] In some embodiments of the present invention, Figures 2 to 4As shown, the inner sidewall of the injection barrel 100 is provided with a first flange 106, the first elastic valve 201 is provided with a first connecting portion 204, the first blocking portion 202 is connected to the first connecting portion 204, and the first connecting portion 204 is clamped between the mounting portion 104 and the first flange 106. Specifically, the first flange 106 can be annular and extend along the circumference of the injection barrel 100. When the first elastic valve 201 needs to be installed, the first elastic valve 201 is located below the first flange 106, and then the outer sidewall of the mounting portion 104 is threadedly connected to the inner sidewall of the bottom end of the injection barrel 100, and the first connecting portion 204 is clamped between the mounting portion 104 and the first flange 106. When the first elastic valve 201 needs to be disassembled, the mounting portion 104 is unscrewed from the bottom end of the injection barrel 100, and then the first elastic valve 201 is removed. This makes disassembly and assembly convenient, and further facilitates cleaning, maintenance, or replacement of the first elastic valve 201. It should be noted that, in some other embodiments of the present invention, the first elastic valve 201 may also be welded or bonded to the inner side wall of the bottom end of the injection cylinder 100 .

[0048] In some embodiments of the present invention, the adjacent sides of two first connecting portions 204 are abutted against each other. This arrangement can prevent the electrolyte from passing between the adjacent sides of the two first connecting portions 204, thereby improving the barrier effect of the first barrier structure 200.

[0049] In some embodiments of the present invention, Figures 2 to 4 As shown, the top surface of the mounting portion 104 is provided with a clearance groove 107 that communicates with the through hole 105, and the first blocking portion 202 is received in the clearance groove 107. In this embodiment, the provision of the clearance groove 107 on the mounting portion 104 to receive the first blocking portion 202 prevents interference between the mounting portion 104 and the first blocking structure 200, thereby enabling the first blocking structure 200 to smoothly switch between its natural state and its open state, making it more convenient to use and more practical.

[0050] In some embodiments of the present invention, Figures 1 to 4 As shown, the side wall of the liquid injection cylinder 100 is provided with a liquid inlet pipe 108, and the liquid inlet pipe 108 is used to connect to an external electrolyte storage device. When the piston 101 slides upward, a negative pressure can be formed in the liquid injection cylinder 100, so that the electrolyte in the electrolyte storage device can be extracted through the liquid inlet pipe 108, without the need for additional extraction through the liquid injection needle 103, which is more convenient to use. It should be noted that in order to prevent the electrolyte from being re-injected into the liquid inlet pipe 108 when the piston 101 slides downward, a one-way valve or a structure similar to the first barrier structure 200 can be provided on the liquid inlet pipe 108. In addition, a pump can be provided on the liquid inlet pipe 108, and when the piston 101 slides upward, the electrolyte is directly pumped into the liquid injection cylinder 100 through the pump.

[0051] In some embodiments of the present invention, Figures 1 to 4 As shown, the side wall of the liquid injection cylinder 100 is provided with a liquid inlet connector 109, the liquid inlet pipe 108 is connected to the liquid inlet connector 109, and a second barrier structure 300 is provided in the liquid inlet connector 109. The second barrier structure 300 includes at least two second elastic valves 301 provided on the inner side wall of the liquid inlet connector 109 and distributed along the circumference of the liquid inlet connector 109. The second elastic valve 301 is provided with a second barrier portion 302, wherein, in a natural state, the adjacent sides of two adjacent second barrier portions 302 are in contact with each other, and the ends of all second barrier portions 302 are in contact with each other. When the piston 101 slides upward, the negative pressure formed in the liquid injection cylinder 100 acts on the second barrier portion 302, causing the second barrier portion 302 to produce an elastic deformation that can separate the ends of all second barrier portions 302 from each other. When the piston 101 slides upward, negative pressure is generated in the injection barrel 100. Under the action of the negative pressure and the pressure of the electrolyte in the liquid inlet pipe 108, all the second blocking parts 302 are elastically deformed, thereby enabling the ends of all the second blocking parts 302 to separate from each other to form an opening, so that the electrolyte in the liquid inlet pipe 108 can pass through the opening and enter the injection barrel 100, thereby achieving liquid extraction. When the piston 101 slides downward, positive pressure is generated in the injection barrel 100, and part of the pressure acts on the second blocking parts 302. However, due to the reverse pressure generated by the electrolyte in the liquid inlet pipe 108 and the restoring force of the second blocking parts 302 themselves, the first blocking part 202 will be deformed first, making it less likely for the second blocking parts 302 to be deformed, thereby preventing the electrolyte in the injection barrel 100 from being re-injected into the liquid inlet pipe 108.

[0052] In some embodiments of the present invention, Figure 2 As shown, in the natural state, the second blocking portion 302 extends in a direction close to the center line of the injection cylinder 100 and the center line of the liquid inlet connector 109, so that the surfaces of all the second blocking portions 302 close to the center line of the liquid inlet connector 109 enclose a second tapered groove 303. That is, in the natural state, all the second blocking portions 302 roughly form a tapered structure, which protrudes toward the center line of the injection cylinder 100. In this way, as shown in FIG. Figure 4As shown, when the piston 101 slides downward, even if the second blocking portion 302 is subjected to the positive pressure in the liquid injection cylinder 100, the second blocking portion 302 is not easily elastically deformed, and can maintain the blocking state, thereby also preventing the electrolyte in the liquid injection cylinder 100 from re-entering the liquid inlet pipe 108. In addition, the surfaces of all the second blocking portions 302 close to the center line of the liquid inlet connector 109 are enclosed to form a second tapered groove 303. Some electrolyte in the liquid inlet pipe 108 will enter the second tapered groove 303, and then when the piston 101 slides upward, it is convenient for the electrolyte in the liquid inlet pipe 108 to push open the end of the second blocking portion 302. Moreover, the second tapered groove 303 is tapered, which has a better effect of pushing open the end of the second blocking portion 302, thereby making the ends of all the second blocking portions 302 separate from each other to form an opening.

[0053] In some embodiments of the present invention, Figures 2 to 4 As shown, a connecting ring 110 is provided on the end of the liquid inlet pipe 108, and the outer wall of the connecting ring 110 is threadedly connected to the inner wall of the liquid inlet connector 109. The second elastic valve 301 is provided with a second connecting portion 304, and the second blocking portion 302 is connected to the second connecting portion 304. The inner wall of the liquid inlet connector 109 is provided on the second flange 111, and the second connecting portion 304 is clamped between the connecting ring 110 and the second flange 111. Specifically, the second flange 111 can be annular and extend along the circumference of the liquid inlet connector 109. When the second elastic valve 301 needs to be installed, the second elastic valve 301 is located on the outside of the second flange 111, and then the outer wall of the connecting ring 110 is threadedly connected to the inner wall of the liquid inlet connector 109, and the second connecting portion 304 is clamped between the connecting ring 110 and the second flange 111. When the second elastic valve 301 needs to be removed, the connecting ring 110 is unscrewed from the outer end of the liquid inlet connector 109, and then the second elastic valve 301 is removed. This makes disassembly and assembly convenient, and further facilitates cleaning, maintenance, or replacement of the second elastic valve 301. It should be noted that in some other embodiments of the present invention, the second elastic valve 301 can also be welded or bonded to the inner wall of the liquid inlet connector 109.

[0054] In some embodiments of the present invention, the adjacent sides of two adjacent second connection parts 304 are abutted against each other. This arrangement can prevent the electrolyte from passing between the adjacent sides of the two adjacent second connection parts 304, thereby improving the barrier effect of the second barrier structure 300.

[0055] In some embodiments of the present invention, Figures 1 to 4As shown, the top of the liquid injection cylinder 100 is provided with a driving unit 112, and the driving unit 112 is connected to the push-pull rod 102 to control the push-pull rod 102 to move along its own axial direction. When the driving unit 112 is started, the driving unit 112 can control the push-pull rod 102 to move along its own axial direction, thereby controlling the piston 101 to slide up and down, thereby realizing liquid extraction and liquid injection. Compared with manually operating the push-pull rod 102, the operation is more convenient, more time-saving and labor-saving. It should be noted that the structure of the driving unit 112 can be various, for example, it can be a cylinder or an oil cylinder, as long as it can control the push-pull rod 102 to move along its own axial direction. In addition, in some other embodiments of the present invention, the driving unit 112 can also be not provided, but the push-pull rod 102 can be directly operated manually.

[0056] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A lithium-ion battery electrolyte injection machine, characterized in that: include: An injection cylinder, wherein a piston is slidably mounted in the injection cylinder, a push-pull rod is provided at the top end of the piston, and an injection needle is provided at the bottom end of the piston; The first barrier structure includes at least two first elastic valves provided at the bottom end of the inner side wall of the injection cylinder and distributed along the circumference of the injection cylinder, wherein the first elastic valves are provided with a first barrier portion; Wherein, in a natural state, the adjacent sides of two adjacent first barrier portions are in contact with each other, and the ends of all the first barrier portions are in contact with each other; When the piston slides downward, the electrolyte in the injection cylinder applies pressure to the first blocking portion, causing the first blocking portion to generate elastic deformation that can separate the ends of all the first blocking portions from each other.

2. The lithium-ion battery electrolyte injection machine according to claim 1, characterized in that: In a natural state, the first blocking portion extends downward and close to the center line of the injection cylinder, so that all surfaces of the first blocking portion close to the center line of the injection cylinder are enclosed to form a first conical groove.

3. The lithium-ion battery electrolyte injection machine according to claim 2, characterized in that: The bottom end of the injection cylinder is penetrated, the top end of the injection needle is connected to a mounting portion, the outer wall of the mounting portion is threadedly connected to the inner wall of the bottom end of the injection cylinder, and the mounting portion is provided with a through hole connecting the injection needle and the injection cylinder.

4. The lithium-ion battery electrolyte injection machine according to claim 3, characterized in that: The inner side wall of the injection cylinder is provided with a first flange, the first elastic valve is provided with a first connecting portion, the first blocking portion is connected to the first connecting portion, and the first connecting portion is clamped between the mounting portion and the first flange.

5. The lithium-ion battery electrolyte injection machine according to claim 4, characterized in that: A top surface of the mounting portion is provided with a clearance groove communicating with the through hole, and the first blocking portion is received in the clearance groove.

6. The lithium-ion battery electrolyte injection machine according to any one of claims 1 to 5, characterized in that: A liquid inlet pipe is provided on the side wall of the liquid injection cylinder, and the liquid inlet pipe is used to connect to an external electrolyte storage device.

7. The lithium-ion battery electrolyte injection machine according to claim 6, characterized in that: The side wall of the liquid injection cylinder is provided with a liquid inlet joint, the liquid inlet pipe is connected to the liquid inlet joint, a second barrier structure is provided in the liquid inlet joint, the second barrier structure includes at least two second elastic valves provided on the inner side wall of the liquid inlet joint and distributed along the circumference of the liquid inlet joint, and the second elastic valve is provided with a second barrier portion; Wherein, in a natural state, the adjacent sides of two adjacent second barrier portions are in contact with each other, and the ends of all the second barrier portions are in contact with each other; When the piston slides upward, the negative pressure formed in the injection cylinder acts on the second blocking portion, causing the second blocking portion to generate elastic deformation that can separate the ends of all the second blocking portions from each other.

8. The lithium-ion battery electrolyte injection machine according to claim 7, characterized in that: In a natural state, the second barrier portion extends in a direction close to the center line of the injection cylinder and close to the center line of the liquid inlet connector, so that all surfaces of the second barrier portion close to the center line of the liquid inlet connector enclose a second conical groove.

9. The lithium-ion battery electrolyte injection machine according to claim 8, characterized in that: The end of the liquid inlet pipe is rotated to provide a connecting ring, the outer wall of the connecting ring is threadedly connected to the inner wall of the liquid inlet joint, the second elastic valve is provided with a second connecting portion, the second barrier portion is connected to the second connecting portion, the inner wall of the liquid inlet joint is provided with a second flange, and the second connecting portion is clamped between the connecting ring and the second flange.

10. The lithium-ion battery electrolyte injection machine according to any one of claims 1 to 5, characterized in that: A driving portion is provided at the top end of the liquid injection cylinder, and the driving portion is connected to the push-pull rod to control the push-pull rod to move along its own axial direction.

Images