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  • Sep. 15, 2023
  • By Admin

Analysis about the service life of lithium ion batteries

Lithium ion batteries will experience a decline in service life and become increasingly less durable during use, which is actually related to the battery's cycle life and safety. Cycle life refers to the available capacity of a battery. If a battery is not durable, it means that its storage capacity is decreasing. The reason for this is that the activated lithium ions in the battery are blocked, making it impossible to charge and discharge. The safety issues of lithium ion batteries are caused by internal thermal runaway, overcharging and over discharging of the battery, as well as compression and puncture of the battery, resulting in short circuits, which can cause combustion or explosion of the battery.

Defective coatings or folded electrodes on lithium ion batteries can pose a risk of affecting the life of lithium ion batteries, so battery protection must be in place. In addition to the activation of the protection mechanism by the battery protection board, the selection and manufacture of the battery module is also crucial.

How to improve the life of lithium ion batteries?

The ratio of cathode and anode materials of lithium ion batteries should be reasonable. Because the active materials of the positive and negative electrodes are fixed on the substrate by the binder, and the long term stability of the binder and the good mechanical properties of the battery can delay the decline rate of the battery life, improving the chemical stability and thermal stability of the cathode material is one of the feasible methods to maintain the life of the lithium ion battery.

Choose the right electrolyte. Because the electrolyte contains active hydrogen substances and metal ion impurities such as iron, sodium, aluminum, nickel, etc., and the electrolyte containing impurities directly affects the number of cycles of the battery, the electrolyte has an important impact on the life of the lithium ion battery. Choosing the right electrolyte can also improve the life of lithium ion batteries.

Set reasonable conditions and scope of use. In the use of lithium ion batteries, it is necessary to strictly limit the use conditions of the battery, such as the charge and discharge rate, operating temperature range, storage temperature range, charge and discharge cut-off voltage, etc., to avoid the battery exceeding the use limit.

Starting from the rate and performance of the battery, reduce the overcharge and overdischarge of the battery, avoid use at high temperatures, etc., and locally improve the life of the lithium ion battery.

Strengthen the safety protection of lithium ion batteries, set up battery safety valves, adopt thermal shutdown diaphragms, load special protection circuits, enable special battery management systems, etc., to strengthen the safety of batteries and improve the life of lithium ion batteries.

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