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3.2 Thermal Management

Due to inconsistent internal resistance of the battery cells, there is a problem of inconsistent heat. The addition of a thermal management system can adjust the temperature difference of the entire battery pack to maintain it within a small range. Cells that generate more heat still have a higher temperature rise, but they will not differ significantly from other cells, and the level of degradation will not show a significant difference.

3.3 Equilibrium

The inconsistency of individual battery cells results in some battery cell terminal voltages always leading others and reaching the control threshold first, leading to a decrease in the overall system capacity. To address this issue, the battery management system BMS has designed a balancing function.

A certain battery cell reaches the charging cut-off voltage first, while the voltage of the other battery cells lags significantly. The BMS starts the charging balance function, or connects a resistor to discharge some of the electricity from the high-voltage battery cell, or transfers the energy to the low-voltage battery cell. In this way, the charging deadline is lifted, the charging process resumes, and the battery pack is charged with more power.

Until now, the inconsistency of battery cells remains an important area of research in the industry. No matter how high the energy density of the battery cells is, encountering inconsistencies can disrupt the situation and greatly reduce the battery pack's capacity.

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