Standing and forming process of liquid-injected aluminum shell lithium ion battery
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An ion battery, aluminum shell lithium technology, applied in the field of aluminum shell lithium ion battery after liquid injection, standing and forming process, to achieve the effect of reducing workshop dehumidification requirements, easy implementation and good quality
Inactive Publication Date: 2019-05-10
JIANGSU FRONT NEW ENERGY +1
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[0003] The invention mainly aims at the problem of exposure of the aluminum shell lithium-ion battery during standing and forming, and proposes a method that is simple, easy to implement, and has a good sealing effect. The aluminum shell lithium-ion battery that does not require the humidity of the workshop is left standing and formed after liquid injection craft
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Embodiment 1
[0024] This embodiment is a 50Ah wound-type aluminum-cased lithium-ion battery. The cell is left to stand after liquid injection and the formation process is implemented according to the following steps:
[0025] 1. The battery is injected with electrolyte according to the normal amount;
[0026] 2. The same batch of batteries are connected in series after liquid injection;
[0027] 3. Put the cells connected in series into a closed box;
[0028] 4. Stand for 2 hours at normal temperature and pressure;
[0029] 5. Then vacuumize the airtight box to -0.08MPa;
[0030] 6. Stand in a vacuum state for 24 hours;
[0031] 7. Inject nitrogen into the airtight box to break the vacuum, and let it stand for 10 minutes under normal pressure;
[0032] 8. Transfer the battery cells that have been placed in parallel and are still in parallel to the formation box, and vacuumize -0.08MPa after the battery cells are connected;
[0033] 1.9. Carry out the chemical formation process accordi...
Embodiment 2
[0036] This embodiment is still a lithium-ion battery with a specification of 50Ah coiled aluminum case. After the battery cell is injected with liquid, it is left to stand and the formation process is implemented according to the following steps:
[0037] 1. The battery is injected with electrolyte according to the normal amount;
[0038] 2. The same batch of batteries are connected in series after liquid injection;
[0039] 3. Put the cells connected in series into a closed box;
[0040] 4. Stand for 1 hour at normal temperature and pressure;
[0041] 5. Then vacuumize the airtight box to -0.10MPa;
[0042] 6. Stand still for 20 hours in a vacuum state;
[0043] 7. Inject nitrogen into the airtight box to break the vacuum, and let it stand for 30 minutes under normal pressure;
[0044] 8. Transfer the battery cells that have been statically treated and are still in a parallel state to the formation box, and vacuumize -0.10MPa after the battery cells are connected;
[00...
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Abstract
The invention discloses a standing and forming process of a liquid-injected aluminum shell lithium ion battery. The process is carried out according to the following steps of injecting liquid into battery cores in a normal amount; after liquid is injected into the same batch of battery cores, connecting the battery cores in series; placing the battery cores connected in series in a closed box; performing standing on the battery cores for 1-2 hours under normal temperature and normal pressure conditions; then vacuumizing the closed box; performing standing on the closed box for 20-24 hours in avacuum state; injecting nitrogen into the closed box to break the vacuum, performing standing on the closed box at normal pressure for at least 10 min; transferring the battery cores which are stillin parallel after the standing treatment to a forming box; vacuumizing the forming box after the battery cores are connected; performing a forming process according to conventional indexes in the vacuum state; after forming is completed, sealing an aluminum shell battery core opening by using a steel ball. According to the standing and forming process of the liquid-injected aluminum shell lithiumion battery disclosed by the invention, standing is performed under the vacuum condition, on the one hand, the electrolyte in the battery cores is not directly in contact with air in the workshop, andthe HF acid is not generated; on the other hand, internally installed polar plates of the battery cores are sufficiently soaked by the electrolyte so that the quality of the produced battery is goodand stable.
Description
technical field [0001] The invention belongs to the technical field of electrochemical battery manufacturing. Specifically, the invention relates to a manufacturing process of a lithium-ion battery, in particular to a process of standing still and forming an aluminum-shell lithium-ion battery after liquid injection. Background technique [0002] Injecting the electrolyte into the cell is an indispensable process in the manufacture of lithium-ion batteries. In order for the electrolyte to fully infiltrate the plate, the cell must be left for a period of time after the electrolyte is injected, and then the subsequent formation process can be implemented. Since the shell of aluminum-cased lithium-ion batteries is harder than the shell of soft-packed lithium-ion batteries, the battery cells cannot be sealed immediately after the electrolyte is injected, so the built-in electrolyte is exposed to the atmosphere during the subsequent standing and formation periods. The air humidity...
Claims
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