What is the self-discharge of the battery? 3C lithium battery test, what is the function of the battery test module?

Among the performance parameters of 3C lithium batteries, self-discharge capacity is one of the important parameters to measure the battery status. Self-discharge is the charge retention capacity of the battery, which refers to the power stored by the 3C lithium battery in a certain environment in an open circuit state. The ability to maintain. The self-discharge of 3C lithium battery will be affected by the process, material and storage environment. At the same time, self-discharge is also an indispensable item in the test of 3C lithium battery.

The temperature range of the 3C lithium battery during storage should be between -20~45C. After the battery is fully charged, a certain degree of self-discharge is normal in the state of shelving. Generally speaking, the lower the storage temperature of 3C lithium batteries, the lower the self-discharge rate. However, once the temperature range is exceeded, the battery performance may be damaged, rendering it unusable. The self-discharge of 3C lithium batteries can be divided into physical self-discharge and chemical self-discharge. Physical self-discharge is less affected by temperature and will cause the final open circuit voltage of the battery to be zero. Chemical self-discharge is greatly affected by temperature and state of charge.

The self-discharge behavior of the 3C lithium battery will cause certain damage to the battery, such as shortening the use time of the 3C lithium battery, reducing the service life of the battery, and causing uneven charge in the battery pack. The reasons for the self-discharge of 3C lithium batteries are:

1. The diaphragm isolation, uniformity, electronic insulation, tensile strength, etc. are all poor;

2. The pole piece has fallen powder, winding dislocation, current collector has burrs, etc.;

3. There are conductive materials in the diaphragm, and impurities in the electrolyte and active materials of the pole pieces.

In order to qualify and standardize the manufacturing process of 3C lithium batteries so that the battery has stable performance, it is necessary to test the finished 3C lithium batteries, and a battery test module must be used as an auxiliary. The battery test module can ensure the stability of the 3C lithium battery test, avoid current attenuation or connect the card PIN, the high-current shrapnel micro-needle module is a relatively high-quality battery test module, exclusively produced by Kaizhitong, with excellent performance.

In appearance, the high-current shrapnel microneedle module is a one-piece shrapnel design that can transmit current in the range of 1-50A. The current circulates in the same material with constant voltage and no current attenuation.

In terms of performance, the high-current shrapnel micro-needle module can be adapted to the test in the small pitch field in the 3C lithium battery test, and it can maintain a stable connection between 0.15-0.4mm, and the pin will not be stuck.

In use, the high-current shrapnel microneedle module has an average service life of up to 20w times, and can reach up to 50w times under good environment, operation and maintenance, and can be used continuously.

For 3C lithium battery testing, there is a high-current shrapnel micro-needle module as a battery testing module, which can not only improve the test efficiency, but also reduce the test cost. The purpose of the 3C lithium battery test is to screen out the batteries with unqualified processes and substandard performance, so as to avoid excessive self-discharge of the battery and affect the use of 3C lithium batteries. Therefore, the high current shrapnel microneedle module is used in the 3C lithium battery. It plays a very important role in testing.