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Aging of lithium-ion batteries
Aging generally refers to the placement of batteries after the first charge after assembly, which can be room temperature aging or high temperature aging. All functions are aimed at stabilizing the performance and composition of the SEI film formed after initial charging.
The room temperature aging temperature is 25 ℃, and the high-temperature aging plants are different, some have 38 ℃ and 45 ℃. Time between 48 and 72 hours
Aging and split sealing:
Regarding the formation of open batteries, the relative humidity should be controlled below 2% at room temperature, and the sealing effect will be better after aging.
Regarding high-temperature aging, the sealing aging effect is better.
However, it can be confirmed that there are electrochemical dynamic changes during the aging process, which greatly contribute to the stability of SEI and promote the stability of the electrochemical system.
The purpose of aging
In fact, one of the reasons is to fully infiltrate the electrolyte, and the other is that certain active components of the active cathode material undergo certain deactivation reactions to make the entire battery performance more stable. Many companies use high-temperature aging to make this process faster. High temperature aging requires attention to controlling time and temperature. However, due to the degradation effect of living substances beyond normal temperature aging, good control, sufficient reflection of effective ingredients, stable battery characteristics and performance, poor control, electrical performance decline, low output, new infrared radiation, and even leakage and other conditions are very likely
The performance of the battery becomes more stable after high-temperature aging. In the production process of most lithium-ion battery manufacturers, high-temperature aging is adopted. Temperature 45~50 ℃, battery aging for 1-3 days. After high-temperature aging, potential adverse phenomena of the battery will be exposed, such as voltage changes, thickness changes, internal resistance changes, etc., which are comprehensive indicators for directly testing the safety and electrochemical performance of this batch of batteries.
At present, most battery companies use domestically produced inferior separators for mass production, and high-temperature aging has become an unwritten rule for internal structural safety testing of batteries
High temperature aging is only to shorten the entire production cycle of the battery. Players can only enter the battery by accelerating chemical reactions at high temperatures. The benefits of the battery may not exceed the damage it may bring. It is best to incubate at room temperature for more than three weeks. We are negative, with sufficient electrolyte balance and other chemical reactions, and then the battery performance will be more realistic.
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