Residual liquid treatment device for liquid injection of cylindrical lithium battery

Abstract

The utility model discloses a residual liquid treatment device for liquid injection of a cylindrical lithium battery, which belongs to the technical field of residual liquid treatment for liquid injection of the cylindrical lithium battery and comprises a rack and a suction head, a liquid collecting tank is mounted in the rack, a vacuum pump for enabling the liquid collecting tank to generate negative pressure is arranged on one side of the liquid collecting tank, and a liquid suction connecting pipe is connected onto the suction head. The other end of the liquid suction connecting pipe extends into the liquid collection tank, an annular cover is arranged on the suction head, a step is arranged between the annular cover and the suction head, and dense liquid suction holes are formed in the step. According to the utility model, the liquid collecting tank generates negative pressure through the vacuum pump, then residual electrolyte is sucked into the liquid collecting tank through the suction head, and the ring cover on the suction head is inserted into the battery, so that the electrolyte in the battery can be prevented from being sucked out; the device further comprises a freezing box, the output end of the freezing box is inserted into the liquid collecting tank, and the electrolyte in the liquid collecting tank is frozen into gel through the freezing box, so that the electrolyte is prevented from being vaporized and sucked into the vacuum pump.

Description

Technical Field

[0001] The utility model belongs to the technical field of residual liquid treatment for cylindrical lithium batteries during liquid injection, and particularly relates to a device for treating residual liquid in cylindrical lithium batteries during liquid injection. Background Art

[0002] The key working stations in the assembly section of cylindrical lithium-ion batteries involve processes such as shell insertion, spot welding, grooving, liquid injection, sealing, cleaning, and film sleeving. The electrolyte is the "blood" of the lithium battery, and the liquid injection process is extremely important. The existing liquid injection forms are divided into atmospheric pressure liquid injection and vacuum liquid injection. However, in the current industry, after liquid injection of cylindrical lithium batteries, a certain amount of electrolyte remains at the grooved part of the roll groove, resulting in slow seepage of the remaining electrolyte during subsequent sealing and formation capacity testing, which easily causes rust at the shell opening and affects the subsequent service life of the battery, posing a safety risk.

[0003] Currently, there are two methods for removing residual liquid from cylindrical lithium batteries: wiping the inner wall of the shell opening with non-woven fabric; or blowing nitrogen to blow off the residual liquid on the inner wall. However, during production, wiping with non-woven fabric will cause the entire circumference of the shell opening to be contaminated with electrolyte, which easily increases the rust area of the battery; while blowing nitrogen easily blows out the electrolyte inside the battery, affecting the amount of injected electrolyte, and the flying electrolyte pollutes the surrounding equipment components. Summary of the Utility Model

[0004] To solve the problems raised in the above background art, the utility model provides a device for treating residual liquid in cylindrical lithium batteries during liquid injection, which has the characteristics of reducing the pollution area of the electrolyte and not affecting the electrolyte already injected inside the battery.

[0005] To achieve the above object, the utility model provides the following technical solution: A device for treating residual liquid in cylindrical lithium batteries during liquid injection includes a frame and a suction head. A liquid collection tank is installed inside the frame. A vacuum pump for generating negative pressure in the liquid collection tank is provided on one side of the liquid collection tank. A liquid suction connection pipe is connected to the suction head, and the other end of the liquid suction connection pipe extends into the interior of the liquid collection tank. A ring cover is provided on the suction head. There is a step between the ring cover and the suction head, and a dense array of liquid suction holes is provided on the step.

[0006] To control the on-off of the suction head, further, a solenoid valve is installed on the liquid suction connection pipe.

[0007] To connect the suction head and the liquid suction connection pipe, further, the upper end of the suction head is connected with a connection head communicating with the liquid suction holes.

[0008] To connect the vacuum pump and the liquid collection tank, further, a connection pipe is connected above the liquid collection tank, and the vacuum pump is connected to the connection pipe through a vacuum connection pipe.

[0009] To discharge the electrolyte collected in the liquid collection tank, further, a drain pipe is connected to the bottom of the liquid collection tank, and a control valve is installed on the drain pipe.

[0010] To indicate the liquid level height in the liquid collection tank, further, a liquid level tube is installed on the liquid collection tank.

[0011] To freeze the electrolyte inside the liquid collection tank into a gel state and prevent the electrolyte from vaporizing and being sucked into the vacuum pump, further, a freezer is also included. The freezer is installed above the frame, and the output end of the freezer is inserted into the interior of the liquid collection tank.

[0012] To enhance the heat insulation effect of the liquid collection tank and reduce the power consumption of the freezer, further, a heat insulation sleeve is sleeved outside the liquid collection tank.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] 1. The present utility model creates a negative pressure in the liquid collection tank through a vacuum pump, and then sucks the remaining electrolyte into the liquid collection tank through a suction head. The ring cover on the suction head is inserted into the battery, which can prevent the electrolyte in the battery from being sucked out;

[0015] 2. The present utility model also includes a freezer. The output end of the freezer is inserted into the interior of the liquid collection tank, and the electrolyte inside the liquid collection tank is frozen into a gel state through the freezer, preventing the electrolyte from vaporizing and being sucked into the vacuum pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings are used to provide a further understanding of the present utility model and constitute a part of the specification. They are used together with the embodiments of the present utility model to explain the present utility model and do not constitute a limitation to the present utility model. In the drawings:

[0017] Figure 1 is a schematic structural diagram of the present utility model;

[0018] Figure 2 is a schematic structural diagram of the suction head of the present utility model;

[0019] Figure 3 is a schematic structural diagram of the liquid collection tank of the present utility model;

[0020] In the figure: 1. Frame; 2. Vacuum connection pipe; 3. Freezer; 4. Connection pipe; 5. Solenoid valve; 6. Liquid suction connection pipe; 7. Suction head; 71. Connection head; 72. Step; 73. Ring cover; 74. Liquid suction hole; 8. Liquid collection tank; 81. Liquid level tube; 82. Control valve; 83. Drain pipe; 9. Vacuum pump. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0022] Embodiment 1

[0023] Please refer to Figures 1-3 , the present utility model provides the following technical solutions: A cylindrical lithium battery liquid injection residual liquid treatment device, including a frame 1 and a suction head 7. A liquid collection tank 8 is installed inside the frame 1. A vacuum pump 9 for generating negative pressure in the liquid collection tank 8 is provided on one side of the liquid collection tank 8. A liquid suction connecting pipe 6 is connected to the suction head 7, and the other end of the liquid suction connecting pipe 6 extends into the liquid collection tank 8. A ring cover 73 is provided on the suction head 7. A step 72 is provided between the ring cover 73 and the suction head 7, and a dense liquid suction hole 74 is provided on the step 72.

[0024] By adopting the above technical solutions, the present utility model generates negative pressure in the liquid collection tank 8 through the vacuum pump 9, and then sucks the residual electrolyte into the liquid collection tank 8 through the suction head 7. The ring cover 73 on the suction head 7 is inserted into the battery, which can prevent the electrolyte in the battery from being sucked out.

[0025] Specifically, a solenoid valve 5 is installed on the liquid suction connecting pipe 6.

[0026] By adopting the above technical solutions, it is used to control the on-off of the suction head 7.

[0027] Specifically, a connector 71 communicating with the liquid suction hole 74 is connected to the upper end of the suction head 7.

[0028] By adopting the above technical solutions, it is used to connect the suction head 7 with the liquid suction connecting pipe 6.

[0029] Specifically, a connecting pipe 4 is connected above the liquid collection tank 8, and the vacuum pump 9 is connected to the connecting pipe 4 through a vacuum connecting pipe 2.

[0030] By adopting the above technical solutions, it is used to connect the vacuum pump 9 with the liquid collection tank 8.

[0031] Specifically, a drain pipe 83 is connected to the bottom of the liquid collection tank 8, and a control valve 82 is installed on the drain pipe 83.

[0032] By adopting the above technical solutions, it is used to discharge the electrolyte collected in the liquid collection tank 8.

[0033] Embodiment 2

[0034] The difference between this embodiment and Embodiment 1 is as follows: Specifically, a liquid level pipe 81 is installed on the liquid collection tank 8.

[0035] By adopting the above technical solution, it is used to indicate the liquid level height in the liquid collection tank 8.

[0036] Embodiment 3

[0037] The difference between this embodiment and Embodiment 1 is as follows: Specifically, it further includes a freezer 3. The freezer 3 is installed above the frame 1, and the output end of the freezer 3 is inserted into the interior of the liquid collection tank 8. The model of the freezer 3 is TRL-117ST·LM.

[0038] By adopting the above technical solution, the electrolyte inside the liquid collection tank 8 is frozen into a gel state by the freezer 3, avoiding the vaporization of the electrolyte being sucked into the vacuum pump 9.

[0039] Specifically, a heat insulation sleeve is sleeved outside the liquid collection tank 8.

[0040] By adopting the above technical solution, the heat insulation effect of the liquid collection tank 8 is enhanced, and the power consumption of the freezer 3 is reduced.

[0041] In summary, the utility model creates negative pressure in the liquid collection tank 8 through the vacuum pump 9, and then sucks the remaining electrolyte into the liquid collection tank 8 through the suction head 7. The ring cover 73 on the suction head 7 is inserted into the battery, which can prevent the electrolyte in the battery from being sucked out; the utility model further includes a freezer 3, and the output end of the freezer 3 is inserted into the interior of the liquid collection tank 8. The electrolyte inside the liquid collection tank 8 is frozen into a gel state by the freezer 3, avoiding the vaporization of the electrolyte being sucked into the vacuum pump 9.

[0042] Finally, it should be noted that the above are only the preferred embodiments of the utility model and are not used to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the utility model shall be included within the protection scope of the utility model.

Claims

1. A device for treating residual liquid during injection of a cylindrical lithium battery, characterized in that: The machine comprises a frame and a suction head, wherein a liquid collecting tank is installed inside the frame, a vacuum pump for generating negative pressure in the liquid collecting tank is arranged on one side of the liquid collecting tank, a liquid suction connecting pipe is connected to the suction head, and the other end of the liquid suction connecting pipe extends into the interior of the liquid collecting tank, a ring cover is arranged on the suction head, a step is arranged between the ring cover and the suction head, and dense liquid suction holes are arranged on the step; A connecting pipe is connected to the top of the liquid collecting tank, and a vacuum pump is connected to the connecting pipe through the vacuum connecting pipe.

2. A cylindrical lithium battery residual liquid treatment device according to claim 1, characterized in that: A solenoid valve is installed on the liquid suction connecting pipe.

3. A cylindrical lithium battery residual liquid treatment device according to claim 1, characterized in that: The upper end of the suction head is connected with a connector which is in communication with the suction hole.

4. A cylindrical lithium battery residual liquid treatment device according to claim 1, characterized in that: The bottom of the liquid collecting tank is connected with a drain pipe, and a control valve is installed on the drain pipe.

5. The device for treating residual liquid during injection of a cylindrical lithium battery according to claim 1, characterized in that: A liquid level pipe is installed on the liquid collecting tank.

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