Valve-controlled sealed lead-acid battery temperature is too high

The rated capacity of valve-regulated sealed lead-acid battery refers to the value of valve-regulated sealed lead-acid battery at 25℃. It is generally considered that the working temperature of valve-regulated sealed lead-acid battery is more than 20~30℃. ideal. When the battery temperature is too low, it appears that the capacity of the valve-regulated sealed lead-acid battery is reduced, because the electrolyte does not react well with the active material of the electrode plate under low temperature conditions. The reduced capacity will not meet the expected backup use time and remain within the specified depth of discharge, which can easily lead to overdischarge of VRLA batteries.

Judging from the external parameters of the valve-regulated sealed lead-acid battery, the voltage has a great relationship with the temperature. The voltage drop of the single-cell battery drops by 3mV for every 1℃ increase in temperature. In other words, the voltage of the lead-acid valve-regulated sealed lead-acid battery has a negative temperature coefficient, and its value is -3mV/℃. For the same reason, the increase in ambient temperature is likely to cause over-discharge of VRLA batteries. High temperature will also bring about water loss and thermal runaway of VRLA batteries. Temperature is a major factor affecting the normal operation of valve-regulated sealed lead-acid batteries. In solar photovoltaic systems, the controller is generally required to have a temperature compensation function.