Battery is the wide range of applications in life, can be divided into traditional type lead-acid charging battery and maintenance-free battery, because the battery USES lead calcium alloy for grid frame, less so when the charging water decomposition, moisture evaporation is also low, coupled with the outer seal structure, the release of acid gas is very few, so it is compared with the traditional battery, It has the advantages of no need to add any liquid, long storage time for wiring pile head and so on. The battery has a life cycle, the use of different conditions, different environment, different service life. Today to understand what causes will affect the service life of the battery?

1.Deep discharge

The discharge depth has a great influence on the cycle life of the battery. If the battery is often discharged deep, the cycle life will be shortened. Because of the depth of the same rated capacity of the battery discharge means that often USES the large current charging and discharging, in the large current discharge or often in the undervoltage state but not in a timely manner to recharge, produce big sulfate particles, plate cannot be make full use of active material and the long-term down the actual battery capacity will gradually decreases, and affect the normal work of the battery. Because the solar photovoltaic power generation system is generally not easy to overcharge, so the long-term deficit state is the main reason for the battery failure and life shortening in the solar photovoltaic system.

2.Discharge rate

Generally, the capacity of 20 hours discharge rate is the rated capacity of the battery. If the discharge rate is lower than the specified hours, the battery capacity can be higher than the rated value. If the discharge rate is higher than the specified hour, the capacity released is smaller than the rated capacity of the battery. The discharge rate also affects the terminal voltage of the battery. When the battery is discharging, the electrochemical reaction current is preferentially distributed on the surface closest to the main solution, resulting in the formation of lead sulfate on the surface of the electrode and blocking the inside of the porous electrode. In the high current discharge, the above problems are more prominent, so the discharge current becomes larger, the battery capacity is smaller, the terminal voltage value drops faster, that is, the discharge termination voltage value decreases with the increase of the discharge current. However, on the other hand, the lower the discharge rate is, the better it is. Studies have shown that too low discharge rate for a long time will significantly increase the amount of lead sulfate molecules, resulting in stress resulting in plate bending and active substance shedding, which will also reduce the service life of the battery.

3.The external temperature is too high

 The rated capacity of the battery refers to the value of the battery at 25℃. It is generally believed that the working temperature of the valve-controlled sealed lead-acid battery is better in the range of 20~30℃. When the battery temperature is too low, it is shown that the capacity of the battery decreases, because the electrolyte cannot react well with the active substance of the plate under low temperature conditions. Capacity reduction will not be able to meet the expected backup use time and keep within the prescribed discharge depth, which is easy to cause over discharge of the battery. From the external parameters of the battery, the voltage has a great relationship with the temperature. When the temperature increases by 1℃, the voltage drop of the single cell battery decreases by 3mV. In other words, the voltage of lead-acid battery has a negative temperature coefficient, whose value is -3mV/℃. In the same way, an increase in ambient temperature is likely to cause overdischarge of the battery. High temperature will also bring storage battery water loss, thermal runaway phenomenon. Temperature is a major factor affecting the normal operation of the battery. In the solar photovoltaic system, the controller is generally required to have the function of temperature compensation.

The above is about the reasons for shortening the service life of the battery, avoid the above problems, do a good job of battery maintenance is the right way to extend the life. Friends can use some repair methods to prolong the life of the battery, such as regular injection of some electrolyte can make the ion activity reactivated, so that its capacity is restored. You can also use battery professional maintenance tools. Lianhong has always focused on battery accessories and supporting related business, and has profound technical accumulation and practical technology patents in the field of safety, convenience and maintenance of automotive and industrial batteries. The company's main products are: battery status indicator, battery safety valve (exhaust plug), battery equalizer, waterproof and air permeable valve, forklift battery automatic hydrating device, battery water alarm, battery water gun and other products.