1 Temperature affects battery life: thermal runaway causes temperature rise: Valve-controlled closed lead-acid battery (VRLA) charging when the internal gas recombination itself is an exothermal reaction, so that the battery temperature rises, floating charge flow increases, the gas evolution increases, and the battery temperature rises higher, the battery itself is a "poor liquid", tightly assembled, internal heat dissipation is difficult, if not timely heat removal, will cause thermal runaway. When the voltage at the end of floating charge is too high and the ambient temperature around the battery rises, the thermal runaway of the battery will be aggravated, resulting in the expansion and deformation of the battery slot, increased water loss rate, and even battery damage.

Therefore, the operating parameters of the charger are very important. In the past, we paid more attention to the output voltage stability accuracy, current stability accuracy, ripple coefficient, average mobility (high frequency) index of the charger, but paid less attention to the current limiting feedback, temperature feedback and other loops. In particular, the temperature feedback closed-loop compensation loop. There is a large gap in the manufacturing process of each charging mechanism, and the temperature sampling and material selection accuracy is different (the manufacturing cost is large). Therefore, temperature feedback should focus on acceptance in technical disclosure and acceptance operation;

(1) The floating charging voltage of the battery has a certain functional relationship with the temperature. Generally, the voltage correction factor is reduced or increased by 3mV according to the temperature rise or fall of 1℃. The charger should automatically adjust the floating charge voltage parameter according to the temperature (new charging equipment must have this function).

(2) For manufacturers with good charging process, the software floating charge value corresponds to the characteristic curve of different brands of batteries to meet the reliability of battery operation. At the same time, the battery floating charging special requirements can also be reset parameters.

(3) For the charger without temperature feedback, the floating charging voltage of the charger should be defined according to the ambient temperature. When the ambient temperature changes, the floating charging pressure is properly adjusted through the artificial closed loop to meet the temperature compensation of the battery.

2 Battery room installation of anti-riot air conditioning, heating equipment to meet the operating requirements, battery ambient temperature of 20~25℃, is the best way to improve the battery life, but also for the charger temperature compensation function of the lack of compensatory measures:

3 The output characteristic curve of the charger should match the operating characteristic curve of the valve-controlled closed lead-acid battery:

4 Charging mechanism manufacturing process does not meet the requirements can not be put into operation. Especially in the technical transformation, the valve-controlled sealed lead-acid battery cannot be simply replaced, and the matching charger should be selected first.

5 For the centralized control station, unmanned substation battery room temperature should be added to the battery monitoring system;