Liquid injection device and method for preventing residual liquid from splashing and application

Abstract

The invention discloses a liquid injection device and method for preventing residual liquid from splashing and application, and belongs to the technical field of power battery liquid injection. The liquid injection device comprises a liquid injection probe and an air bag assembly, and the air bag assembly comprises an air suction pipeline, an exhaust pipeline, an air suction one-way valve, an air blowing one-way valve, an air bag and a moving module; one end of the air suction pipeline is connected with the liquid injection probe, the air suction pipeline is connected with the exhaust pipeline through an air bag, an air suction one-way valve is arranged on the air suction pipeline, and an air blowing one-way valve is arranged on the exhaust pipeline. The liquid injection device capable of preventing the residual liquid from splashing has the beneficial effects that a branch is additionally arranged in the liquid injection needle pipeline, micro-negative pressure is formed in the liquid injection needle pipeline through compressibility of the air bag after liquid injection is completed, the problem of residual liquid splashing is solved, and the device capable of preventing the residual liquid from splashing is simple in structure, reduces occupied space and is convenient to use. The installation and the maintenance are convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of power battery liquid injection, and more specifically to a liquid injection device, method and application for preventing residual liquid from splashing. Background Art

[0002] Traditional liquid injection is mainly injected into the injection cup through the injection pump and injection system, and the electrolyte is injected into the battery by positive and negative pressure. The pipeline is mainly controlled by the back pressure valve. After the back pressure valve is closed, the residual electrolyte in the injection needle pipeline will be thrown out during the injection process as the module or robot moves to the next station, causing crystals to form on the surface of the station. The schematic diagram of the traditional liquid injection method is shown in the figure. Figure 1 shown.

[0003] The Chinese patent application document with publication number CN117141821A discloses a liquid-leakage-proof cutting fluid filling system, including a conveyor belt and an adjustment component, a filling component and a sealing component sequentially arranged on one side of the conveyor belt, wherein the filling component is located between the adjustment component and the sealing component, and a plurality of containers are arranged on the top of the conveyor belt, wherein the filling component includes a frame, a buffer mechanism arranged on one side of the frame and a liquid injection mechanism arranged inside the filling component, wherein the conveyor belt is passed through the inside of the frame, and the buffer mechanism is located above the conveyor belt. The device solves the problem that the existing filling machine cannot ensure the uniformity of the liquid inlet during the container conveying process, resulting in the filling nozzle being unable to extend into the container, and solves the problem that the liquid remains on the outer wall of the filling nozzle during filling and cannot be cleaned, resulting in liquid leakage. The system achieves the effect of being compatible with the filling of different types of containers and preventing liquid residue and splashing leakage. However, the patent does not disclose the liquid injection device of the present invention. Summary of the invention

[0004] The technical problem to be solved by the present invention is how to solve the problem of battery injection residue.

[0005] The present invention solves the above technical problems through the following technical means:

[0006] The first aspect of the present invention proposes a liquid injection device for preventing residual liquid from splashing, comprising a liquid injection probe and an airbag assembly, wherein the airbag assembly comprises an intake pipe, an exhaust pipe, an intake check valve, a blowing check valve, an airbag, and a movable module; one end of the intake pipe is connected to the liquid injection probe, the intake pipe and the exhaust pipe are connected via the airbag, the intake pipe is provided with an intake check valve, and the exhaust pipe is provided with a blowing check valve.

[0007] Preferably, the suction pipe is at a certain distance L1 from the liquid outlet at the end of the injection probe, and the distance L1 plus the length L2 of the suction pipe is less than the distance L3 at which the negative pressure generated by the compression of the airbag absorbs and refluxes the residual liquid.

[0008] Preferably, the injection probe forms a certain angle a with the suction pipe, a<90°.

[0009] Preferably, the angle a is 30 to 60 degrees.

[0010] Preferably, the angle a is 45°.

[0011] Preferably, the liquid injection device also includes a moving module, a mounting plate, a telescopic cylinder, a back pressure valve fixing plate, a moving guide rail, and an airbag fixing plate.

[0012] Preferably, the back pressure valve fixing plate is fixedly arranged on the injection probe, and one side of the back pressure valve fixing plate is slidingly matched with the movable guide rail on the vertical plate; an airbag fixing plate and a telescopic cylinder are fixedly arranged on the vertical plate; the telescopic cylinder is located below the airbag fixing plate.

[0013] Preferably, the airbag is fixed on an airbag fixing plate; the lower end of the vertical plate is fixedly connected to the upper surface of the mounting plate; and the lower surface of the mounting plate is fixed on a slider of the moving module.

[0014] The second aspect of the present invention proposes the application of the above-mentioned liquid injection device for preventing residual liquid from splashing in the field of battery liquid injection.

[0015] A second aspect of the present invention provides a method for preventing residual liquid from splashing, comprising the following steps:

[0016] S1, the mobile module drives the entire assembly to the station to be filled with liquid;

[0017] S2, when the injection probe descends to inject liquid, it will simultaneously press down the airbag. Under the action of the blow check valve, the gas in the airbag will only be discharged from the exhaust pipe;

[0018] S3, after the injection is completed, the back pressure valve is closed, the device moves upward, the air bag is restored, and the gas will only flow back through the suction pipe and begin to absorb the residual liquid upward;

[0019] S4, the mobile module moves to the next station for liquid injection, opens the back pressure valve, and the electrolyte is injected into the battery cell through the injection probe.

[0020] The beneficial effects of the present invention are:

[0021] 1. The present invention provides an injection device for preventing residual liquid from splashing. By adding a branch to the injection needle pipeline and using the compressibility of the airbag, a slight negative pressure is formed in the injection needle pipeline after the injection is completed, thereby solving the problem of residual liquid splashing. The device for preventing residual liquid from splashing of the present invention has a simple structure, reduces space occupancy, is easy to install, and is convenient for maintenance.

[0022] 2. The airbag assembly of the device for preventing residual liquid from splashing of the present invention automatically generates a slight negative pressure in the tube during the liquid injection process, so as to absorb the residual liquid in the tube and prevent the residual liquid from flying out.

[0023] 3. The airbag assembly of the present invention prevents electrolyte backflow through a specific installation distance and angle and a one-way valve.

[0024] 4. The present invention also provides a method for preventing splashing, the principle of which is simple and easy to understand, convenient and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the traditional injection method;

[0026] Figure 2 Schematic diagram of a residual liquid anti-splashing device according to Example 1 of the present invention;

[0027] Figure 3 This is a schematic diagram of the splash prevention principle of the liquid injection device according to Example 1 of the present invention;

[0028] Figure 4 It is a structural entity diagram of the liquid injection device of Example 2 of the present invention;

[0029] Figure 5 for Figure 4 Partial structural diagram of

[0030] In the figure, 1-liquid injection system, 2-back pressure valve, 3-liquid injection probe, 4-residual liquid, 5-battery, 6-intake pipe, 7-exhaust pipe, 8-intake check valve, 9-blow check valve, 10-air bag, 11-movable module, 12-mounting plate, 13-telescopic cylinder, 14-back pressure valve fixing plate, 15-movable guide rail, 16-air bag fixing plate. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Unless otherwise specified, the test materials and reagents used in the following examples can be obtained from commercial sources.

[0033] If no specific techniques or conditions are specified in the examples, they can be carried out according to the techniques or conditions described in the literature in the art or according to the product instructions.

[0034] Embodiment 1:

[0035] A liquid injection device for preventing residual liquid from splashing, comprising a liquid injection probe 3, an airbag assembly, a movable module 11, a mounting plate 12, a telescopic cylinder 13, a back pressure valve fixing plate 14, a movable guide rail 15, and an airbag fixing plate 16. The airbag assembly comprises an air suction pipe 6, an exhaust pipe 7, an air suction check valve 8, an air blowing check valve 9, an airbag 10, and a movable module 11; one end of the air suction pipe 6 is connected to the liquid injection probe 3, and the air suction pipe 6 and the exhaust pipe 7 are connected via the airbag 10. The air suction pipe 6 is provided with an air suction check valve 8, and the exhaust pipe 7 is provided with an air blowing check valve 9. Figure 2 shown.

[0036] Working principle:

[0037] When the injection probe 3 descends to inject liquid, it will simultaneously press down the airbag 10, and the compressed gas will be discharged from the exhaust pipe 7. When the injection is completed, the back pressure valve 2 is closed, the probe moves up, and the airbag 10 will return to its original state. At this time, the injection probe 3 pipeline has a slight negative pressure, which will suck up the electrolyte in the injection probe 3 pipeline to prevent the residual liquid 4 in the pipeline from splashing when moving to the next station. (such as Figure 3 (shown)

[0038] Embodiment 2:

[0039] A liquid injection device for preventing residual liquid from splashing, comprising a liquid injection probe 3 and an airbag assembly, wherein the airbag assembly comprises an air suction pipe 6, an air exhaust pipe 7, an air suction check valve 8, an air blowing check valve 9, an airbag 10, a moving module 11, a mounting plate 12, a telescopic cylinder 13, a back pressure valve fixing plate 14, a moving guide rail 15, and an airbag fixing plate 16; one end of the air suction pipe 6 is connected to the liquid injection probe 3, the air suction pipe 6 is connected to the air exhaust pipe 7 through the airbag 10, and the air suction pipe 6 is provided with an air suction check valve 8, The exhaust pipe 7 is provided with a blow check valve 9; the back pressure valve fixing plate 14 is fixedly provided on the liquid injection probe 3, and one side of the back pressure valve fixing plate 14 is slidably matched with the movable guide rail 15 on the vertical plate; the airbag fixing plate 16 and the telescopic cylinder 13 are fixedly provided on the vertical plate; the telescopic cylinder 13 is located below the airbag fixing plate 16; the airbag 10 is fixed on the airbag fixing plate 16; the lower end of the vertical plate is fixedly connected to the upper surface of the mounting plate 12; the lower surface of the mounting plate 12 is fixed on the slider of the movable module 11. The suction pipe 6 is at a certain distance L1 from the liquid outlet at the end of the liquid injection probe 3. The distance L1 plus the length L2 of the suction pipe 6 is less than the distance L3 of the residual liquid 4 adsorbed and refluxed by the negative pressure generated after the airbag 10 is compressed. The main purpose is to prevent the residual liquid 4 from being sucked into the airbag 10.

[0040] The injection probe 3 forms a certain angle a with the air intake pipe 6 , where a=45°, mainly to prevent the electrolyte from flowing through the injection probe 3 and back into the air intake pipe 6 or even flowing through the interior of the airbag 10 during normal injection.

[0041] The mobile module 11 controls the overall horizontal movement, and the longitudinal mobile module 11 can be added according to the actual working conditions. The mounting plate 12 is mainly used to mount the entire device on the slider of the mobile module 11. The telescopic cylinder 13 only needs to control the back pressure valve fixing plate 14 to move vertically on the moving guide rail 15. The back pressure valve fixing plate 14 drives the back pressure valve 2 and the injection probe 3 to move up and down as a whole. The airbag 10 will be compressed during the up and down movement. The airbag 10 is fixed on the airbag fixing plate 16, and the airbag fixing plate 16 remains installed and fixed.

[0042] A method for preventing residual liquid from splashing, comprising the following steps:

[0043] S1, the mobile module 11 drives the entire assembly to the station to be filled with liquid;

[0044] S2, when the injection probe 3 descends to inject liquid, it will simultaneously press down the airbag 10. Due to the blowing check valve 9, the gas in the airbag 10 will only be discharged from the exhaust pipe 7;

[0045] S3, after the injection is completed, the back pressure valve 2 is closed, the device moves upward, the air bag 10 is restored, and the gas will only flow back through the suction pipe 6 to start to absorb the residual liquid 4 upward;

[0046] S4, the mobile module 11 moves to the next station for liquid injection, and the back pressure valve 2 is opened. At this time, the electrolyte is injected into the battery cell through the liquid injection probe 3.

[0047] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A liquid injection device for preventing residual liquid from splashing, comprising a liquid injection probe (3) and an airbag assembly, characterized in that: The airbag assembly comprises an air suction pipe (6), an air exhaust pipe (7), an air suction check valve (8), an air blowing check valve (9), an airbag (10), and a movable module (11); one end of the air suction pipe (6) is connected to the liquid injection probe (3), the air suction pipe (6) and the air exhaust pipe (7) are connected via the airbag (10), the air suction pipe (6) is provided with an air suction check valve (8), and the air exhaust pipe (7) is provided with an air blowing check valve (9).

2. The liquid injection device for preventing residual liquid from splashing according to claim 1, characterized in that: The suction pipe (6) is at a certain distance L1 from the liquid outlet at the end of the injection probe (3), and the distance L1 plus the length L2 of the suction pipe (6) is less than the distance L3 at which the residual liquid (4) is adsorbed and refluxed by the negative pressure generated by the compression of the air bag (10).

3. The liquid injection device for preventing residual liquid from splashing according to claim 1, characterized in that: The injection probe (3) and the air suction pipe (6) form a certain angle a, a<90°.

4. The liquid injection device for preventing residual liquid from splashing according to claim 3, characterized in that: Angle a is 30 to 60 degrees.

5. The liquid injection device for preventing residual liquid from splashing according to claim 4, characterized in that: The angle a is 45°.

6. The liquid injection device for preventing residual liquid from splashing according to claim 1, characterized in that: The liquid injection device also includes a moving module (11), a mounting plate (12), a telescopic cylinder (13), a back pressure valve fixing plate (14), a moving guide rail (15), and an air bag fixing plate (16).

7. The liquid injection device for preventing residual liquid from splashing according to claim 6, characterized in that: The back pressure valve fixing plate (14) is fixedly arranged on the liquid injection probe (3), and one side of the back pressure valve fixing plate (14) is slidably matched with the movable guide rail (15) on the vertical plate; an air bag fixing plate (16) and a telescopic cylinder (13) are fixedly arranged on the vertical plate; the telescopic cylinder (13) is located below the air bag fixing plate (16).

8. The liquid injection device for preventing residual liquid from splashing according to claim 7, characterized in that: The airbag (10) is fixed on an airbag fixing plate (16); the lower end of the vertical plate is fixedly connected to the upper surface of the mounting plate (12); and the lower surface of the mounting plate (12) is fixed on a slider of the moving module (11).

9. Application of the liquid injection device for preventing residual liquid from splashing as claimed in any one of claims 1 to 8 in the field of battery liquid injection.

10. A method for preventing residual liquid from splashing, characterized in that: The following steps are involved: S1, the mobile module (11) drives the entire assembly to the station to be filled with liquid; S2, when the injection probe (3) descends to inject liquid, it will simultaneously press down the air bag (10), and under the action of the blowing check valve (9), the gas in the air bag (10) will only be discharged from the exhaust pipe (7); S3, when the injection is completed, the back pressure valve (2) is closed, the device moves upward, the air bag (10) is restored, and the gas will only flow back through the suction pipe (6) and begin to absorb the residual liquid (4) upward; S4, the mobile module (11) moves to the next station for liquid injection, and the back pressure valve (2) is opened. At this time, the electrolyte is injected into the battery cell through the liquid injection probe (3).

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