• The external short circuit test is to connect the lithium-ion battery to a fixed-value resistor, and the power of the lithium-ion battery is discharged through the resistor. According to the size of the fixed-value resistor, the short-circuit current can be controlled from hundreds to tens of thousands of amps. High current will accumulate a large amount of heat in a short period of time in the lithium-ion battery, which may cause thermal runaway of the lithium-ion battery. Whether the short-circuit test can be passed is mainly affected by the magnitude of the short-circuit current. The larger the short-circuit current, the faster the heat generation of the lithium-ion battery will be, and the heat diffusion rate of the battery will not change much. More heat is accumulated inside, and the temperature rises more, which may lead to serious problems such as shrinkage of the diaphragm, short circuit of positive and negative electrodes, and then lead to thermal runaway of lithium-ion batteries.
• AIT high-current series high-precision current sensors have a test bandwidth of 200KHz, which can accurately record the entire process of instantaneous short-circuit current changes, and provide high-precision test data for battery research and development.