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Lithium Battery Volume Separation Technology Standard

Shenzhen Sinoli Electronic Co.,Ltd | Updated: Feb 02, 2019

Lithium Battery Volume Separation Technology Standard 

1. The technical parameters of formation process are as follows: step operating current (mA) voltage limitation (v) time (min) cumulative capacity (mAh) 1 constant current charging 0.05C 4.1 240 0.2C 2 0.1C 4. 1 2400.6C 3 0.2C 4.1 9000.9C

2. Measure the voltage after converting into batteries, and divide the voltage according to the voltage after converting into batteries. The voltage after dividing is as follows: the voltage is less than 3.90V, and the voltage is more than 3.90V according to the third step of converting into batteries. Measure and classify the voltage after conversion and replenishment. Battery voltage < 3.90V 3.900V < Battery voltage < 3.950V 3.950V < Battery voltage < 3.990V Battery voltage > 4.000V B 3. The aging process in high temperature room is: baking at 45 degrees for 8 hours.

4. After vacuum aging for 3.8 hours, the batteries are gradually taken out of the high temperature room and put into the vacuum oven to vacuum. When vacuum is pumped, the time from the beginning of vacuum to -0.1 Mpa is controlled for 2 minutes, then the argon gas is released to the vacuum degree of 0. The batteries are removed and sealed immediately.

5. Shaping and sealing shaping: After vacuum is finished, immediately remove rubber band and paper towel, put the battery in the shaping fixture horizontally, with the injection hole facing upward, shaping, shaping thickness controlled at 8.05-8.15 mm, and the excess electrolyte extruded is immediately sucked with cloth. Sealing: When the thickness reaches the requirement, the injection holes are immediately sealed with steel beads. The diameter of the steel beads is 1.25+0.02-0 mm. The steel beads must expose one third of the injection holes. When sealing, steel balls must be sealed in place. For batteries with steel balls falling into batteries, they are classified as Grade C.

6. Lacquering and cleaning: After sealing, scrape the glue paper to dot the knees immediately. The steel beads are just covered, and the varnish must be clear and transparent. Cleaning: Clean the batteries immediately after the paint is touched, and do not wipe the paint on the injection hole when cleaning, and the batteries are packed with plastic sheets. Note: In the process of shaping, sealing, painting and cleaning, batteries should be clearly identified according to the grade of the original voltage measurement, which can not be confused. 7. After aging and sealing, the batteries are immediately shelved in a 45 degree high temperature room and baked for 48 hours. 8. Voltage battery voltage less than 3.90V is classified as low voltage. 3.900V < battery voltage < 3.950V, measuring voltage > 3.85V is qualified, and battery voltage < 3.85V is low voltage. 3.950V < battery voltage < 3.990V, measuring voltage > 3.90V is qualified, and battery voltage < 3.90V is low voltage. Battery voltage > 4.000V, measurement voltage > 3.92V is qualified, and battery voltage < 3.92V is low voltage. After measuring the voltage, the low voltage is classified into one group, and the qualified voltage is classified into one group.

9. Polishing the battery after measuring the voltage, polishing the rivet and the bottom (the bottom of the cast composite nickel strip).

10. For the polished batteries, the following steps are taken to separate the batteries at one time. When the batteries are divided into low voltage batteries and qualified batteries, the batteries can be distinguished.

For the polished batteries, the following steps are taken to separate the batteries from the qualified batteries at low voltage.

12. Re-capacitation is used to recalculate B and C grade batteries (including low-voltage batteries) after one-time capacitation. The batteries are recalculated according to one-time capacitation step and classified according to the above classifications.

13. After measuring voltage, internal resistance and thickness in one step, the battery is put aside for 2 hours to measure voltage, internal resistance and card thickness, and the battery voltage < 3.90V is supplemented according to the last step of one step capacitance division to make its voltage > 3.90V.

14. Storage shall be carried out according to the grade of the above capacity, and the date of completion of one capacity must be marked at the time of storage. For low-voltage batteries, they must be labeled as low-voltage batteries.

15. Secondary capacity separation process for the batteries to be assembled from the warehouse in the sixth workshop is carried out according to the following process.