Why do we need to use a large current for the equipotential test of battery packs?
1. The principle of the equipotential test of battery packs The battery pack is composed of multiple cells, and the voltage and internal resistance of each cell may be different. In the equipotential test of battery packs, it is necessary to pass a large current through the battery pack to pull the potential of all cells to the same level, and then test the voltage and internal resistance.
2. Why use a large current?
1. Reduce the resistance in the circuit In the circuit, a voltage drop will occur when current passes through the resistor. In this way, when testing the equipotential of the battery pack, if a smaller current is used, the error of the test will increase due to the resistance in the circuit. Using a larger current can reduce the error caused by the resistance in the circuit, thereby improving the accuracy of the test.
2. More accurate detection of the actual voltage and internal resistance of the battery pack In the equipotential test of the battery pack, it is necessary to test the actual voltage and internal resistance of the battery pack. Using a larger current can more accurately detect the actual voltage and internal resistance of the battery pack. This is because the current distribution may be uneven inside the battery pack due to the internal resistance and mutual influence between the cells, and using a large current can eliminate this influence and more accurately detect the actual voltage and internal resistance of the battery pack. In short, the reason why a large current is used in the battery pack equipotential test is mainly to reduce the resistance in the circuit and more accurately detect the actual voltage and internal resistance of the battery pack.
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