Knowledge of lithium battery

1. Internal air pressure of the battery?

It refers to the internal air pressure of the battery, which is caused by the gas generated during the charging and discharging process of the sealed battery, and is mainly affected by the battery material, manufacturing process, battery structure and other factors. The reason is mainly due to the battery internal moisture and organic solution decomposition of the gas generated in the battery gathered. Continuous overcharging at high rate will lead to increase in battery temperature and internal pressure, and in serious cas.es, it will have destructive effects on the performance and appearance of the battery, such as liquid leakage, bottom bulge, increase in battery internal resistance, and shorten the discharge time and cycle life. Li-ion any form of over to will lead to serious damage to the battery performance, or even explosion. To help Li-ion in the charging process need to use constant current and constant voltage charging mode, to avoid overcharging the battery.

2.Why do batteries need to be stored for a period of time before packaging and shipping?

The storage performance of the battery is an important parameter to measure the stability of the comprehensive performance of the battery. After a certain period of storage, the capacity and internal resistance of the battery are allowed to change to a certain extent. After a certain period of storage, the electrochemical properties of the internal components can be stabilised, and the size of the self-discharge performance of the battery can be understood in order to ensure the quality of the battery.

3. Why chemical formation?

After the manufacture of the battery, through a certain way of charging and discharging its internal positive and negative material activation, improve the battery's charging and discharging performance and self-discharge, storage and other comprehensive performance of the process known as the formation of the battery powder can only reflect the real performance after the formation.

4.What is capacity separation?

Battery in the manufacturing process, due to process reasons make the actual capacity of the battery can not be exactly the same, through a certain charging and discharging system to detect and classify the battery according to the capacity of the process is known as sub-capacity.

5.What is voltage drop?

Battery by qualitative charging to more than 80%, measuring its battery no-load voltage. 5W/2W battery as a load connected to the battery positive and negative extremes of the switch as a battery disconnect, access to the device in series. Open the switch 5 seconds after the voltage drop is not greater than 0.4V, for qualified mainly for testing the battery load performance.

6. What is static resistance? What is the dynamic resistance?

a. Static resistance is the internal resistance of the battery when discharging.

b. Dynamic resistance is the internal resistance of the battery when charging.

7. What welding methods are used for both positive and negative electrodes?

a. Ultrasonic welding machine for positive electrode.

b. Spot welder for negative electrode.

8. The purpose and location of the battery cell sticker?

a. The position of the battery cell sticker is not deformed after the battery cell is wound and shaped. The bottom sticker prevents the positive pole piece in the battery cell from contacting the battery shell at the bottom and causing short circuit.

b, the side sticker so that the battery cell is not deformed after winding and shaping. The bottom sticker prevents the bottom of positive pole piece in the battery cell from contacting with the battery shell and causing short circuit of the battery.

9. Humidity requirements of the drying room? Why should the battery be weighed before liquid injection?

a. Relative humidity below 6%.

b. Weighing in order to accurately calculate the amount of liquid injection.