How long can lithium batteries use? The life of the lithium battery depends on the quality of the battery cell. Its life span is mainly affected by factors such as working temperature, charging and discharge, charging times, and cycle times. The smaller the charging and discharge rate, the less the number of charging times, and the more cycle times, the battery life will grow. In addition, the battery cells also have different levels. For example, some battery cells use lithium nickel cobaltate as the positive electrode material, while others use lithium iron phosphate as a positive electrode material, which will also affect the battery life.

　　At present, the batteries sold in the market are limited. For example, our common lead-acid batteries can generally only be used for 6-8 years; nickel-cadmium and nickel-metal hydride batteries are generally used for about 2 years. If they are used with new energy vehicles, their life span can reach 8-10 years. The life of the lithium battery is mainly determined by the battery cell. Among them, lithium -ion battery life is a relatively important factor that directly affects the overall life of lithium batteries. The screening and inspection work before the battery is very important.

　　1. Charging and discharge efficiency

　　The charging and discharge efficiency refers to the current consumption rate of the battery at the time of working. The charging and discharge efficiency is high, the life of the battery is long, and the life span is short.

　　Second, internal resistance

　　Internal resistance reflects the movement of lithium ions during the charging and discharge process. The smaller the internal resistance, the smaller the resistance of the lithium ion movement. The internal resistance of the battery consists of three parts: resistance inside the cell, the resistance between the positive and negative electrodes, and the diaphragm resistor. Generally speaking, different types of battles are different due to the different levels of manufacturing process, production environment and process control, and their internal resistance is different. The internal resistance inside the cell is too large, which can easily lead to the decomposition of the electrode material or deposited on the pole. If the internal resistance is too small, it is easy to cause the battery to open the road and the battery charging abnormally, resulting in a decrease in battery life. Therefore, the resistance inside the cell is required during the test. The internal resistance test instruments are mainly: LFP tester, CB tester, IGBT DC high -pressure generator, and multimeter. Here are some precautions in the test process:

　　Third, discharge multiplier

　　The discharge multiplied rate refers to the discharge in the battery test with a constant current as the load, from the discharge to the deadline. Generally, the 1C multiplier is 0.1C discharge, the 2C multiplier is 0.5C discharge, and the 3C multipliers are 1C discharge. The greater the discharge multiplier, the more the battery consumed in the use, and the greater the required power replenishment; if the discharge multipliers are too small, it will cause the battery to put it, and it will cause a large power loss during the charging process. Therefore, the appropriate voltage, current and temperature need to be selected during use. In a normal working environment, the power lithium batteries used by new energy vehicles are generally 0.5c, 2C and 3C. For lithium batteries of different capacity levels, the discharge multiplier is also different. Generally use 1C as the maximum current during actual use and test at different temperatures.

　　Fourth, high temperature performance

　　When lithium batteries work in high temperature environments, the performance will decrease. Batches working in environments with temperature higher than 60 ° C, their electrochemical response speed will slow down significantly. Data show that when the battery works at high temperature, its capacity is only about 75%at room temperature. When charging at room temperature, the charging capacity is only about 70%at room temperature. This is because the battery itself has a process of aging, and the number of cycles of cycles at high temperatures will become less.

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