Precautions for liquid injection in lithium battery production
Preparation of lithium battery pack injection tools: beakers, liquid bottles, glass rods, droppers, plastic tubes, valves and other auxiliary appliances and articles drying: drying in an oven at 60-65°C, drying time ≥ 3h (especially pay attention to remove the water in the dropper tip).
Cloth strips, paper rolls and other difficult-to-dry materials need to be dried in a vacuum at a temperature of 75-80℃ for 8 hours, during which time, the air should be changed every 2 hours;
Check the glove box Moisture content: use a dew point meter to test the moisture in the glove box, the dew point meter shows that the dew point temperature needs to be
≤-30℃; otherwise, you need to replace the nitrogen in the glove box and test again;
Preparation of lithium battery pack electrolyte: pressurize with nitrogen gas into a stainless steel vat of 200Kg pure electrolyte to transfer the electrolyte to a large beaker in the glove box;
Drying method of additives: current The additives used are BG, T, E, VC, and 204. According to their physical properties, they can be divided into two categories: solid and liquid (including those that become liquid after a little heating), solid ones are: BG, liquid ones are: 204, T , E, VC.
Drying solid additives: put the additives in a beaker, stir and mix evenly with a glass rod, cover the mouth of the beaker with 250 mesh filter gauze, tie the mouth of the cup with copper wire, and put it in a vacuum drying box Dry under vacuum (≤-0.08 Mpa) at 65±5oC for 10~12H; after drying, it should be taken out immediately, and the transfer process should not exceed 3 minutes; if you don’t need to take it out immediately, please store it in a dry box under vacuum;
Transfer of liquid additives
(1), directly press out such as 204 and T by high-pressure gas, use a dry container (must be equipped with a lockable lid) after connecting, tighten the lid immediately , Send it into the glove box transition bin within 3 minutes; if there is a pipe directly into the glove box, you can directly enter the glove box through the pipe, and the pipe needs to be kept dry;
(2), Can not be pressed out by high-pressure gas, small packages such as VC can be used in the glove box according to the regulations;
(3) The liquid that needs to be heated, such as E. When it melts, loosen the lid. That is, do not melt open, dry at 65±5°C for 3~4 hours. After melting, add several vials at a time, put them in a glove box and store them in a sealed container for multiple use; E can’t repeat drying more than 3 times.
Precautions for the operation of lithium polymer battery cells
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