Multi-cell power supply infusion packaging system

Abstract

This utility model belongs to the field of lithium-ion battery manufacturing technology and discloses a liquid infusion and packaging system for a multi-cell power supply. It includes a quantitative infusion tank, a nitrogen tank, a waste liquid tank, a vacuum pressure tank, a first three-way valve, a second three-way valve, a main infusion pipe, a secondary infusion pipe, a two-way cavitation valve, a battery, a first infusion needle, and a second infusion needle. The quantitative infusion tank is connected to the first three-way valve via a first interface, the nitrogen tank is connected to the first three-way valve via a second interface, one end of the main infusion pipe is connected to the first three-way valve via a third interface, and the other end is connected to the battery via the first infusion needle. The waste liquid tank is connected to the second three-way valve via a first interface, the vacuum pressure tank is connected to the second three-way valve via a second interface, and one end of the secondary infusion pipe is connected to the second three-way valve via a third interface, and the other end is connected to the battery via the second infusion needle. This utility model is applicable to the liquid infusion and packaging of multi-cell lithium-ion batteries and can better meet the drying, liquid injection, formation, and packaging requirements in the lithium-ion battery production process.

Description

Technical Field

[0001] This utility model belongs to the field of lithium-ion battery manufacturing and relates to a liquid infusion packaging system for a multi-cell power supply. Background Technology

[0002] Lithium-ion batteries are widely used in portable electronic devices (such as mobile phones and computers) and electric vehicles due to their advantages such as high energy density, high voltage, environmental friendliness and no memory effect.

[0003] Currently, both domestic and international lithium-ion battery manufacturing involves baking individual cells in a constant temperature and humidity environment in an oven, injecting electrolyte using a liquid injection machine, and allowing them to stand and soak for an extended period before proceeding with formation, capacity testing, and final sealing. However, this method requires multiple pieces of equipment and frequent changes in workstations, resulting in significant investment in environmental control and high energy consumption. Furthermore, the liquid injection machine requires substantial investment and short machine time, which may prevent proper soaking. To ensure complete soaking of the cells, they are typically left to rest for a certain period, thus lengthening the overall battery production cycle and increasing production costs.

[0004] Therefore, it is of great significance to study an infusion packaging system that adopts integrated control of multiple steps at a single station, reduces equipment investment, and lowers costs for multi-cell power supplies. Utility Model Content

[0005] The purpose of this invention is to provide a liquid infusion and packaging system for multi-cell power supplies. The system is simple, easy to install, and highly versatile, effectively ensuring the quality of drying, electrolyte injection, formation, and packaging, and has a high degree of production automation.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A multi-cell power supply infusion packaging system includes a quantitative infusion tank, a nitrogen tank, a waste liquid tank, a vacuum pressure tank, a first three-way valve, a second three-way valve, a main infusion tube, a secondary infusion tube, a two-way cavitation valve, at least one battery, and a first infusion needle and a second infusion needle corresponding to each battery.

[0008] The quantitative infusion tank is connected to the first interface of the first three-way valve, the nitrogen tank is connected to the second interface of the first three-way valve, one end of the main infusion tube is connected to the third interface of the first three-way valve, and the other end of the main infusion tube is connected to the corresponding battery through the first infusion needle.

[0009] The waste liquid tank is connected to the first port of the second three-way valve, the vacuum pressure tank is connected to the second port of the second three-way valve, one end of the auxiliary infusion tube is connected to the third port of the second three-way valve, and the other end of the auxiliary infusion tube is connected to the corresponding battery through the second infusion needle.

[0010] One end of the two-way cavitation valve is connected to the end of the main infusion pipe away from the first three-way valve, and the other end is connected to the end of the auxiliary infusion pipe away from the second three-way valve.

[0011] As a limitation, each of the batteries includes a bare cell, a battery casing, a main liquid injection tube, and a secondary liquid injection tube;

[0012] The bare cell, main liquid injection tube and auxiliary liquid injection tube are located inside the battery casing. The main liquid injection tube is located on the negative tab side of the bare cell, and the auxiliary liquid injection tube is located on the positive tab side of the bare cell. The positive tab and negative tab of the bare cell, as well as the main liquid injection tube and auxiliary liquid injection tube, all pass through the battery casing and are exposed on the outside of the battery casing.

[0013] The other end of the main infusion tube is inserted into the main infusion tube of the corresponding battery through the first infusion needle, with one end exposed on the outside of the battery casing.

[0014] The other end of the auxiliary infusion tube is inserted into the auxiliary infusion tube of the corresponding battery through the second infusion needle, with one end exposed on the outside of the battery casing.

[0015] As a further limitation, each of the bare cells includes a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode;

[0016] The positive electrode includes a positive current collector and a positive electrode film coated on the surface of the positive current collector, and the negative electrode includes a negative current collector and a negative electrode film coated on the surface of the negative current collector. The positive current collector is connected to the positive electrode tab, and the negative current collector is connected to the negative electrode tab.

[0017] As a further limitation, the positive and negative tabs of each bare cell, as well as the main and auxiliary liquid injection tubes, are insulated and sealed from the battery casing through which they pass.

[0018] As a further limitation, the ends of the main injection tube and the auxiliary injection tube exposed on the outside of the battery casing are both sealed by heat fusion.

[0019] As a further limitation, the battery casing is made of aluminum alloy, stainless steel or aluminum-plastic film;

[0020] The main infusion tube, auxiliary infusion tube, main injection tube, and auxiliary injection tube are all made of PP polypropylene or PE polyethylene.

[0021] The first three-way valve, the second three-way valve, and the two-way cavitation valve are all electrically controlled valves made of 304 stainless steel.

[0022] The quantitative infusion tank is a metering tank made of 304 stainless steel;

[0023] The nitrogen tank is a pressure tank made of 304 stainless steel;

[0024] The waste liquid tank is a decompression tank made of 304 stainless steel;

[0025] The vacuum pressure tank is made of 304 stainless steel.

[0026] The technological advancements achieved by this invention compared to existing technologies, due to the adoption of the aforementioned technical solution, are as follows:

[0027] (1) This utility model includes a quantitative infusion tank, a nitrogen tank, a waste liquid tank, a vacuum pressure tank, a first three-way valve, a second three-way valve, a main infusion pipe, a secondary infusion pipe, a two-way cavitation valve, at least one battery, and a first infusion needle and a second infusion needle corresponding to each battery; by integrating the quantitative infusion tank, nitrogen tank, waste liquid tank, vacuum pressure tank and other components into one system, and connecting the first three-way valve to the main infusion pipe, the second three-way valve to the secondary infusion pipe, and one end of the two-way cavitation valve to the main infusion pipe and the other end to the secondary infusion pipe, the equipment has a higher degree of integration, occupies less space, facilitates workshop layout and management, realizes integrated control of multiple steps in a single workstation, and reduces equipment investment;

[0028] (2) By setting up a corresponding main injection tube and a secondary injection tube for each battery, and using the first infusion needle and the second infusion needle to simultaneously insert into the main injection tube and the secondary injection tube of multiple batteries, the present invention achieves simultaneous injection of multiple cells, which greatly improves the infusion efficiency.

[0029] (3) The system design of this utility model is flexible and can adapt to the liquid injection requirements of different quantities and models of bare cells, thus improving the versatility and flexibility of the system;

[0030] (4) This utility model adopts a quantitative infusion tank and automatic control, which can accurately control the amount of liquid injected into each bare cell, reduce manual intervention, and make the operation more convenient; through the cooperation of nitrogen tank and vacuum pressure tank, the internal bare cells of the battery are washed and dried; through the cooperation of nitrogen tank, waste liquid tank and two-way cavitation valve, the waste gas and waste liquid in the formation process can be effectively removed, improving the quality and consistency of liquid injection.

[0031] In summary, this utility model is applicable to the liquid infusion packaging of multi-cell lithium-ion batteries, and can better meet the drying, liquid injection, formation and packaging requirements in the lithium-ion battery production process. Attached Figure Description

[0032] Figure 1 The diagram shown is a structural schematic of an embodiment of this utility model;

[0033] In the diagram: 1. Quantitative infusion tank; 2. Nitrogen tank; 3. Waste liquid tank; 4. Vacuum pressure tank; 5. First three-way valve; 6. Second three-way valve; 7. Main infusion tube; 8. Auxiliary infusion tube; 9. First infusion needle; 10. Second infusion needle; 11. Battery casing; 12. Main injection tube; 13. Auxiliary injection tube; 14. Positive electrode plate; 15. Negative electrode plate; 16. Separator; 17. Positive electrode tab; 18. Negative electrode tab; 19. Two-way cavitation valve. Detailed Implementation

[0034] To better explain and facilitate understanding of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] Example: An infusion packaging system for a multi-cell power supply

[0036] like Figure 1 As shown, this embodiment is an infusion packaging system for a multi-cell power supply, including a quantitative infusion tank 1, a nitrogen tank 2, a waste liquid tank 3, a vacuum pressure tank 4, a first three-way valve 5, a second three-way valve 6, a main infusion tube 7, a secondary infusion tube 8, a two-way cavitation valve 19, at least one battery, and a first infusion needle 9 and a second infusion needle 10 corresponding to each battery.

[0037] In this embodiment, each battery includes a bare cell, a battery casing 11, a main liquid injection pipe 12, and a secondary liquid injection pipe 13; each bare cell includes a positive electrode 14, a negative electrode 15, and a separator 16 disposed between the positive electrode 14 and the negative electrode 15; the positive electrode 14 includes a positive current collector and a positive electrode film coated on the surface of the positive current collector, the negative electrode 15 includes a negative current collector and a negative electrode film coated on the surface of the negative current collector, the positive current collector is connected to the positive electrode tab 17, and the negative current collector is connected to the negative electrode tab 18.

[0038] The bare battery cell, main liquid injection tube 12, and auxiliary liquid injection tube 13 are disposed inside the battery casing 11. The main liquid injection tube 12 is located on the negative electrode tab 18 side of the bare battery cell, and the auxiliary liquid injection tube 13 is located on the positive electrode tab 17 side of the bare battery cell. The positive electrode tab 17 and negative electrode tab 18 of the bare battery cell, as well as the main liquid injection tube 12 and auxiliary liquid injection tube 13, all pass through the battery casing 11 and are exposed on the outside of the battery casing 11. The positive electrode tab 17 and negative electrode tab 18 of each bare battery cell, as well as the main liquid injection tube 12 and auxiliary liquid injection tube 13, are insulated and sealed from the battery casing 11 through which they pass. The exposed ends of the main liquid injection tube 12 and auxiliary liquid injection tube 13 on the outside of the battery casing 11 are sealed by heat fusion.

[0039] In this embodiment, the quantitative infusion tank 1 and the first interface of the first three-way valve 5 are connected, the nitrogen tank 2 and the second interface of the first three-way valve 5 are connected, one end of the main infusion tube 7 is connected to the third interface of the first three-way valve 5, and the other end of the main infusion tube 7 is inserted into the main injection tube 12 of the corresponding battery through the first infusion needle 9 and exposed on the outside of the battery casing 11.

[0040] Waste liquid tank 3 is connected to the first port of the second three-way valve 6, vacuum pressure tank 4 is connected to the second port of the second three-way valve 6, one end of auxiliary infusion tube 8 is connected to the third port of the second three-way valve 6, and the other end of auxiliary infusion tube 8 is inserted into the auxiliary infusion tube 13 of the corresponding battery through the second infusion needle 10 and exposed on the outside of the battery casing 11.

[0041] One end of the two-way cavitation valve 19 is connected to the end of the main infusion pipe 7 away from the first three-way valve 5, and the other end is connected to the end of the auxiliary infusion pipe 8 away from the second three-way valve 6.

[0042] In this embodiment, the number of the first infusion needle 9, the second infusion needle 10, the main infusion tube 12, and the auxiliary infusion tube 13 matches the number of batteries; the battery casing 11 is made of aluminum alloy, stainless steel, or aluminum-plastic film; the main infusion tube 7, the auxiliary infusion tube 8, the main infusion tube 12, and the auxiliary infusion tube 13 are all made of PP polypropylene or PE polyethylene; the first three-way valve 5, the second three-way valve 6, and the two-way cavitation valve 19 are all electrically controlled valves made of 304 stainless steel, which can be electrically opened or closed according to process requirements, so that the first three-way valve 5 is connected to the quantitative infusion tank 1 and the nitrogen tank 2, the second three-way valve 6 is connected to the waste liquid tank 3 and the vacuum pressure tank 4, and the two-way cavitation valve 19 is connected to the main infusion tube 7 and the auxiliary infusion tube 8; the quantitative infusion tank 1 is a metering tank made of 304 stainless steel; the nitrogen tank 2 is a pressure tank made of 304 stainless steel; the waste liquid tank 3 is a decompression tank made of 304 stainless steel; and the vacuum pressure tank 4 is a pressure tank made of 304 stainless steel.

[0043] This embodiment Figure 1 The device uses three sets of batteries, and the number of batteries can be set according to the actual situation.

[0044] The usage process in this embodiment is as follows:

[0045] S1. Place the bare battery cell, main injection tube 12, and auxiliary injection tube 13 into the corresponding battery casing 11. Then, place the main injection tube 12 on the negative electrode tab 18 side of the bare battery cell and the auxiliary injection tube 13 on the positive electrode tab 17 side of the bare battery cell. Finally, seal the battery casing 11. The positive electrode tab 17 and negative electrode tab 18 of the bare battery cell, as well as the main injection tube 12 and auxiliary injection tube 13, all pass through the battery casing 11 and are exposed on the outside of the battery casing 11. The positive electrode tab 17 and negative electrode tab 18 of the bare battery cell, as well as the main injection tube 12 and auxiliary injection tube 13, are insulated and sealed from the battery casing 11. The positive electrode tab 17 and negative electrode tab 18 of the bare battery cell become the positive electrode tab 17 and negative electrode tab 18 of the battery. The ends of the main injection tube 12 and auxiliary injection tube 13 exposed on the outside of the battery casing 11 are sealed by heat fusion.

[0046] S2. Connect the quantitative infusion tank 1 and the first port of the first three-way valve 5, connect the nitrogen tank 2 and the second port of the first three-way valve 5, connect one end of the main infusion tube 7 to the third port of the first three-way valve 5, and connect the other end of the main infusion tube 7 to the main injection tube 12 of the corresponding battery through the first infusion needle 9, with one end exposed outside the battery casing 11; connect the waste liquid tank 3 and the first port of the second three-way valve 6, connect the vacuum pressure tank 4 and the second port of the second three-way valve 6, connect one end of the auxiliary infusion tube 8 to the third port of the second three-way valve 6, and connect the other end of the auxiliary infusion tube 8 to the auxiliary injection tube 13 of the corresponding battery through the second infusion needle 10, with one end exposed outside the battery casing 11; connect the two-way cavitation valve 19 to the main infusion tube 7 and the auxiliary infusion tube 8.

[0047] S3. Inject a quantitative amount of electrolyte into the quantitative infusion tank 1 according to the process, fill the nitrogen tank 2 with nitrogen at 1 to 3 atmospheres according to the process, fill the waste liquid tank 3 with atmospheric pressure nitrogen, and maintain the vacuum pressure tank 4 under vacuum at -0.1MPa.

[0048] S4. According to the process requirements, the second three-way valve 6 is opened electronically to connect with the vacuum pressure tank 4 to draw a vacuum. Then, the first three-way valve 5 is opened to connect with the nitrogen tank 2 to fill with nitrogen. The bare cells inside the battery casing 11 are alternately rinsed and dried several times. According to the process requirements, the first three-way valve 5 is opened electronically to connect with the quantitative infusion tank 1 to slowly infuse the electrolyte and allow the bare cells inside the battery casing 11 to be fully wetted. The second three-way valve 6 is opened electronically to connect with the waste liquid tank 3 to exhaust gas, reduce pressure, and discharge waste liquid.

[0049] S5. According to the process, open the first three-way valve 5, the two-way cavitation valve 19, and the second three-way valve 6 to connect the nitrogen tank 2 and the waste liquid tank 3. Connect the positive electrode 17 and the negative electrode 18 of the battery to the formation power supply and charge and discharge them according to the process requirements. The waste liquid and waste gas generated in this process are discharged into the waste liquid tank 3 to cavitate the waste liquid and waste gas in the main liquid supply pipe 7 and the auxiliary liquid supply pipe 8.

[0050] S6. Remove the first infusion needle 9 and the second infusion needle 10, and heat-seal the needle holes on the main infusion tube 12 and the auxiliary infusion tube 13. The multi-cell power supply is now complete.

[0051] This embodiment integrates a quantitative infusion tank 1, a nitrogen tank 2, a waste liquid tank 3, a vacuum pressure tank 4, a first three-way valve 5, a second three-way valve 6, a main infusion pipe 7, a secondary infusion pipe 8, a two-way cavitation valve 19, and batteries into a single system, achieving integrated control of multiple steps at a single workstation, reducing equipment investment and lowering costs. Furthermore, by simultaneously injecting electrolyte into multiple batteries, the infusion efficiency is significantly improved.

[0052] It should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A multi-cell power supply infusion packaging system, characterized in that, It includes a quantitative infusion tank, a nitrogen tank, a waste liquid tank, a vacuum pressure tank, a first three-way valve, a second three-way valve, a main infusion tube, a secondary infusion tube, a two-way cavitation valve, at least one battery, and a first infusion needle and a second infusion needle corresponding to each battery; The quantitative infusion tank is connected to the first interface of the first three-way valve, the nitrogen tank is connected to the second interface of the first three-way valve, one end of the main infusion tube is connected to the third interface of the first three-way valve, and the other end of the main infusion tube is connected to the corresponding battery through the first infusion needle. The waste liquid tank is connected to the first port of the second three-way valve, the vacuum pressure tank is connected to the second port of the second three-way valve, one end of the auxiliary infusion tube is connected to the third port of the second three-way valve, and the other end of the auxiliary infusion tube is connected to the corresponding battery through the second infusion needle. One end of the two-way cavitation valve is connected to the end of the main infusion pipe away from the first three-way valve, and the other end is connected to the end of the auxiliary infusion pipe away from the second three-way valve.

2. The infusion packaging system for a multi-cell power supply according to claim 1, characterized in that, Each of the batteries includes a bare cell, a battery casing, a main liquid injection tube, and a secondary liquid injection tube; The bare cell, main liquid injection tube and auxiliary liquid injection tube are located inside the battery casing. The main liquid injection tube is located on the negative tab side of the bare cell, and the auxiliary liquid injection tube is located on the positive tab side of the bare cell. The positive tab and negative tab of the bare cell, as well as the main liquid injection tube and auxiliary liquid injection tube, all pass through the battery casing and are exposed on the outside of the battery casing. The other end of the main infusion tube is inserted into the main infusion tube of the corresponding battery through the first infusion needle, with one end exposed on the outside of the battery casing. The other end of the auxiliary infusion tube is inserted into the auxiliary infusion tube of the corresponding battery through the second infusion needle, with one end exposed on the outside of the battery casing.

3. The infusion packaging system for a multi-cell power supply according to claim 2, characterized in that, Each bare cell includes a positive electrode, a negative electrode, and a separator between the positive electrode and the negative electrode. The positive electrode includes a positive current collector and a positive electrode film coated on the surface of the positive current collector, and the negative electrode includes a negative current collector and a negative electrode film coated on the surface of the negative current collector. The positive current collector is connected to the positive electrode tab, and the negative current collector is connected to the negative electrode tab.

4. The infusion packaging system for a multi-cell power supply according to claim 2 or 3, characterized in that, The positive and negative tabs of each bare cell, as well as the main and auxiliary liquid injection tubes, are insulated and sealed from the battery casing through which they pass.

5. The infusion packaging system for a multi-cell power supply according to claim 2 or 3, characterized in that, The ends of the main injection tube and the auxiliary injection tube that are exposed on the outside of the battery casing are both sealed by heat fusion.

6. The infusion packaging system for a multi-cell power supply according to claim 2 or 3, characterized in that, The battery casing is made of aluminum alloy, stainless steel, or aluminum-plastic film. The main infusion tube, auxiliary infusion tube, main injection tube, and auxiliary injection tube are all made of PP polypropylene or PE polyethylene. The first three-way valve, the second three-way valve, and the two-way cavitation valve are all electrically controlled valves made of 304 stainless steel. The quantitative infusion tank is a metering tank made of 304 stainless steel; The nitrogen tank is a pressure tank made of 304 stainless steel; The waste liquid tank is a decompression tank made of 304 stainless steel; The vacuum pressure tank is made of 304 stainless steel.

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