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The progress of human society cannot be separated from the efforts of various industries in society, and the upgrading of various electronic products cannot be separated from the efforts of our designers. In fact, many people do not understand the composition of electronic products, such as lithium-ion batteries.

Nowadays, all new energy concept products such as new energy vehicles and new energy robots use new energy lithium-ion battery cells to form high-capacity lithium-ion batteries. So, what are the technical specifications for these lithium-ion batteries? We understand that battery separators typically use 18650 battery sizes. 18650 is a standard lithium-ion battery type introduced by Sony Corporation in Japan to save costs, where 18 represents a diameter of 18mm, 65 represents a length of 65mm, and 0 represents a cylindrical battery.

Aging generally refers to the placement of batteries after the first charge and electrolyte injection, which can be done at room temperature or high temperature. Both methods are used to stabilize the properties and composition of the SEI film formed after the initial charge and ensure the stability of the electrochemical performance of lithium-ion batteries.

Among them, the aging process screening of internal micro short circuit cells is an important objective. During battery storage, the open circuit voltage will decrease, but the magnitude will not be significant. If the open circuit voltage decreases too quickly or the magnitude is too large, it is an abnormal phenomenon. Battery self discharge can be divided into physical self discharge and chemical self discharge according to different reaction types. From the perspective of the impact of self discharge on batteries, self discharge can be divided into two types: self discharge with reversible compensation for capacity loss and self discharge with permanent capacity loss. Generally speaking, the energy loss caused by physical self discharge is recoverable, while the energy loss caused by chemical self discharge is essentially irreversible.

After the pre formation process of lithium-ion batteries, a certain amount of SEI film will be formed on the graphite negative electrode inside the battery. However, this film has a tight structure and small pores. Aging the battery at high temperatures will help to restructure the SEI structure and form a loose and porous film.

Regarding lithium-ion batteries, the principle and purpose of aging is that the electrolyte needs to be fully moisturized, and the other is that the cathode material used in daily life contains active ingredients that must be deactivated in response, making the overall function of the battery safer. Many companies use high-temperature aging to make this process faster, but high-temperature aging requires attention to controlling time and temperature. Due to the fact that high-temperature aging can produce living substances that age beyond normal temperature, the degradation effect of control is good, and the effective ingredients fully reflect the safety characteristics of the battery. Poor control and excessive reaction can lead to a decrease in electrical function, reduced capacity, the addition of infrared radiation, and even possible leakage and other conditions

The general aging procedure is: charge to 4.0-4.2V, store at room temperature for 7 days, store at high temperature of 45 ℃ for 7 days, detect the voltage difference before and after battery aging, and remove non-conforming products. Leave the battery in an open circuit state at high temperature or room temperature for 7 or 28 days, and measure its self discharge performance by discharging the battery to the cut-off voltage and measuring its discharge capacity.

This article can only provide a preliminary understanding of lithium-ion battery aging testing, which will be helpful for beginners. At the same time, continuous summarization is necessary to improve professional skills. We also welcome everyone to discuss some of the knowledge points in the article.

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