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At present, there is limited room to improve the performance and cost of lithium iron phosphate power lithium ion batteries, so lithium iron phosphate power lithium ion batteries will be more suitable for and ahead of the cascade utilization of ternary lithium ion power lithium ion batteries in the energy storage industry. Considering the service conditions of the energy storage equipment, the retired power lithium-ion battery can continue to be used as the energy storage battery for at least five years. It can give full play to the residual value of retired power lithium-ion batteries, maximize the circular economy and reduce the construction cost of energy storage system. The characteristics of retired power lithium-ion batteries are as follows:

1) Due to the difference of individual use habits of new energy vehicle users and the difference of regional use environment (temperature, etc.), the attenuation of power lithium-ion batteries in each tray is different, even if it is the same batch of power lithium-ion batteries from the same manufacturer.

2) Power lithium-ion batteries not only have a service life, but also have a calendar life. The service life of retired power lithium-ion batteries for reuse will not be too long. Many power lithium-ion batteries even die without any trouble and fail instantly.

3) The traceability of parameters of retired power lithium-ion batteries is generally poor, and it is difficult to accurately evaluate the service life (charging and discharging times) of reuse.

4) The price is cheap or even zero.

5) Because it is a retired power lithium-ion battery, there is generally no warranty or the warranty period is short (usually no more than two years).

The technological progress and performance improvement of power lithium-ion batteries are conducive to the cascade utilization of power lithium-ion batteries, and the standardization of power lithium-ion batteries for electric vehicles is also conducive to the cascade utilization. At present, the entire industry standards and technical system need to be improved, and domestic PACK and bMS technologies can be more closely combined with power lithium-ion batteries. Vehicle manufacturers have higher and higher requirements for bMS technology and power lithium-ion battery management technology. Improving and improving the technical level is the objective demand of the market. The more closely the retired power lithium-ion battery cascade utilization companies are combined with vehicle enterprises, the more adaptable they are to the market demand.

The retired lithium-ion power lithium-ion battery has the following advantages compared with the traditional lead-acid power lithium-ion battery:

1) The lithium-ion power lithium-ion battery with cascade utilization has low self-discharge rate and many cycles. The retired lithium-ion power lithium-ion battery can still have a practical life of 6 years in theory after cascade utilization, with more than 400 deep cycles, which is significantly higher than the 5-year service life of traditional lead-acid battery and about 100 deep cycles.

2) High temperature resistance, lithium-ion power lithium-ion batteries can meet the use environment of - 5~45 ℃. At present, the temperature limit of lead-acid power lithium-ion batteries commonly used in communication base stations is only 30 ℃.

3) It has good discharge characteristics and can discharge with large current.

4) The self-discharge efficiency is low, which can reduce the electric energy loss of power lithium-ion battery during long-term floating charge.

5) Small footprint, light weight and low transportation cost. The weight and volume of lithium-ion power lithium-ion batteries are 1/2~2/3 of that of lead-acid power lithium-ion batteries of the same capacity.

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