The effect of temperature and depth of discharge on the battery

The effect of temperature and depth of discharge on the battery

Within a certain range, the higher the temperature, the higher the released capacity; the lower the temperature, the lower the released capacity. This is why the low-temperature performance of lead-acid batteries is required. The curve of discharge capacity change with temperature is the influence of temperature on capacity when the temperature range is not large.

Depth of discharge refers to the ratio of the discharge capacity of the battery to the storage capacity (or rated capacity) of the battery, and is generally expressed as a percentage. For example, the rated capacity of the battery is 60A·h, the discharge capacity is 30A·h, the discharge depth is 50%, and the discharge depth is 45A·h, the discharge depth is 75%.

It is generally believed that the greater the depth of discharge, the shorter the cycle life of the battery. However, the difference between batteries for different purposes is large. For example, the relationship between the depth of discharge and the life of the battery for electric assisted vehicles is smaller than that of other batteries, and the battery for starting may be very obvious. This is caused by the structure of the battery.

Lead-acid batteries are widely used in the national economy and people’s lives. They are generally classified according to the purpose of the batteries. The main types are starting batteries, stationary batteries, batteries for electric bicycles, lead-acid batteries for solar and wind energy storage, Batteries for ships, batteries for traction, batteries for railway locomotives, batteries for miners’ lamps, batteries for emergency lights, etc. The starting batteries include starting batteries for automobiles, tractors, and engineering vehicles. Stationary storage batteries are subdivided into communication storage batteries and power station storage batteries.
In the starting batteries, according to the water loss of charging, they are divided into maintenance-free batteries, low-maintenance batteries and open-type ordinary batteries.

According to the free state and adsorption (or fixed) state of the electrolyte in the lead-acid battery, it is divided into a rich-liquid battery and a lean-liquid battery. In the lean battery, the battery in which the electrolyte is adsorbed in the glass fiber separator is often designed as a valve-controlled sealed type, which is called a valve-controlled battery; the battery in which the electrolyte is fixed with SiO2 gel is called a gel battery.

Lead-acid batteries are often named before their names based on their structure and performance characteristics, such as maintenance-free starting batteries, acid-proof and explosion-proof fixed batteries, gel batteries for electric vehicles, and batteries for cadmium-free electric power-assisted vehicles.

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