What are the causes of heat generated by discharging 18650 batteries?

What are the causes of heat generated by discharging 18650 batteries?

There is also the definition of this capacity. I searched Baidu and found that they all plan to interrupt the discharge at 3.5V. However, this capacity is obviously not feasible. The calculation of capacity is based on whether it is the nominal capacity measured from the full charge to the cut-off voltage of 2.75V, or the nominal capacity measured from 0 V. If the battery cell is, it should be a problem with your combination, because 5P only has a current of 12A, and the uniform current per section is 2.4A. The temperature rise cannot be so large.    

18650 battery cells have a large charging and discharging current, far exceeding the charging and discharging current of lithium-ion batteries for mobile phones. Therefore, when using the battery maintenance board of a mobile phone on 18650 battery cells, if the charging and discharging currents are relatively small, such as within 1000mA, it is still possible. However, if the current is higher than this, such as reaching 2a or higher, local mismatch may occur, easily burning the maintenance board and causing maintenance to take effect.   

4.2V is the charging bound voltage of lithium-ion batteries, and 3.7V is the discharge maintenance voltage. On mobile phones, when the battery is discharged to 3.6-3.7V, the phone will prompt that the battery level is weak and needs to be charged and turned off. The discharge maintenance voltage of the battery maintenance board is occasionally between 2.75-3.0V. Household appliances have very low power consumption in standby mode, so the discharge current is also very small, and there is no heating phenomenon in some cases. However, when household appliances are working, according to the principle of parallel current circuit, the equivalent load resistance of their batteries is small, and they discharge at high current during operation. When a part of the battery is discharged, the internal resistance increases. However, the current required for the operation of household appliances cannot be reduced. Therefore, a considerable amount of energy is consumed in the internal resistance of the battery, causing it to heat up. At the same time, some batteries discharge faster, and the utilization time of the battery is quickly shortened. Fever persecution editor

1. Prolonged moderate heating of the battery can cause an increase in the temperature of internal components, affecting their abnormal operation;

2. Prolonged heating of the battery will increase its own heat. If the battery is sealed (such as SE, which is not sealed and directly installed), it will cause the internal air to expand vigorously, leading to the battery rising outward, and in severe cases, it will cause the battery to malfunction;