How long can lithium batteries generally last? The lifespan of a lithium battery depends on the quality of the battery cell, which is mainly affected by factors such as operating temperature, charging and discharging rate, charging frequency, and cycling frequency. However, there is also a significant relationship between operating temperature and cycling frequency. It does not mean that the lower the operating temperature, the smaller the charging and discharging rate, the fewer charging times, and the more cycling times, the longer the battery lifespan. In addition, there are different levels of battery cells. For example, some cells use lithium nickel cobalt manganese oxide as the positive electrode material, while others use lithium iron phosphate as the positive electrode material, which can also affect the battery life.

At present, batteries sold in the market have a lifespan limit, for example, our common lead-acid batteries can generally only be used for 6-8 years; Nickel cadmium and nickel hydrogen batteries are generally used for about 2 years. If used in conjunction with new energy vehicles, their lifespan can reach 8-10 years. The lifespan of lithium batteries is mainly determined by the battery cells. The lifespan of lithium-ion batteries is a significant factor that directly affects the overall lifespan of lithium batteries. The screening and inspection work of battery cells before leaving the factory is very important.

1、 Charging and discharging efficiency

The charging and discharging efficiency refers to the current consumption rate of a battery during operation. If the charging and discharging efficiency is high, the battery's lifespan will be long, and vice versa.

2、 Internal resistance

Internal resistance reflects the movement of lithium ions during the charging and discharging process. The smaller the internal resistance, the smaller the resistance to the movement of lithium ions. The internal resistance of a battery consists of three parts: the resistance inside the cell, the resistance between the positive and negative electrodes, and the diaphragm resistance. Generally speaking, different models of battery cells have different internal resistances due to different manufacturing processes, production environments, and process control levels. Excessive internal resistance of the battery cell can easily lead to electrode material decomposition or deposition on the electrode plate; If the internal resistance is too small, it can easily lead to an open circuit in the battery, abnormal charging of the battery, and a decrease in battery life. Therefore, during the testing process, it is necessary to measure the resistance inside the battery cell. The internal resistance testing instruments mainly include LFP tester, CB tester, IGBT DC high-voltage generator, and multimeter. Here are some precautions during the testing process:

3、 Discharge rate

Discharge rate refers to the numerical value from discharge to cut-off time during battery testing, when discharging with a constant current as the load. The general rule is to discharge at a 1C rate of 0.1C, discharge at a 2C rate of 0.5C, and discharge at a 3C rate of 1C. The higher the discharge rate, the more electricity the battery consumes during use, and the greater the amount of electricity needed to be replenished; If the discharge rate is too small, it will cause the battery to over discharge, and it will also cause significant power loss during the charging process. Therefore, it is necessary to choose the appropriate voltage, current, and temperature during use. Under normal working conditions, the power lithium batteries used in new energy vehicles are generally 0.5C, 2C, and 3C. For lithium batteries with different capacity levels, their discharge rate also varies. Usually, 1C is used as the maximum current during actual use and tested at different temperatures.

4、 High temperature performance

When working in high-temperature environments, the performance of lithium batteries will decrease, and the electrochemical reaction rate of batteries working in temperatures above 60 ℃ will significantly slow down. Data shows that when the battery operates at high temperatures, its capacity is only about 75% of that at room temperature, and when charged at room temperature, its charging capacity is only about 70% of that at room temperature. This is because the battery cell itself undergoes an aging process and the number of cycles decreases at high temperatures.

5、 Overcharge resistance

There are many types of power batteries for new energy vehicles, from ternary to lithium iron phosphate, from lithium-ion batteries to lead-acid batteries, from lead-acid batteries to nickel cadmium and nickel hydrogen batteries. The discharge capacity of power batteries on new energy vehicles is different. 1. Due to the higher energy density, power density, and other indicators, the larger the charging rate and the more cycles, capacity degradation will occur. 2. In addition, cars undergo an activation process during high rate discharge. If lithium-ion batteries are used for a long time under high rate discharge, it will form a "memory" effect, causing capacity degradation. 3. There is no capacity degradation issue during the discharge of lead-acid batteries. Due to its low cost, environmental friendliness, and pollution-free advantages, it is favored by some car owners, but its biggest drawback is its short storage life (only 12 months).

Shenzhen Topband Battery Co., Ltd.，established in 2006, is a wholly-owned subsidiary of Shenzhen Topband Co., Ltd. (002139.SZ). We focus on lithium iron phosphate batteries,with independent research and development in cells and BMS. With the ability to integrate the entire industry chain, we are committed to providing customers with one-stop lithium battery solutions and services. Our quality products are widely used in energy storage and light power.