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Lithium battery aging purposes

Date:2016-04-11 View:352

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  • Aging generally refers to placing the battery assembly complete injection fluid into the first charge after the normal-temperature aging can also have high-temperature aging, role is to SEI film forming properties after initial charging and composition can be stabilized.
    Room temperature aging temperature of 25 degrees, different high-temperature aging of the plant, there are some 38 degrees 45 degrees. The time between 48-72 hours
     
        Aging is divided into open and sealed two situations:
    For the opening into the battery, in terms of ambient temperature aging when the relative humidity can be controlled at 2% or less, and then sealing the aging better,
    For high-temperature aging, the aging more after a good seal.
     
        But be sure: the aging process electrochemical dynamics of SEI's stable of great help, can contribute to the stability of the electrochemical system.
     
        Aging purposes fact, the principle is similar to one of the reasons is to allow sufficient electrolyte was infiltration, the other is the positive and negative active material of certain active ingredients by inactivating certain reaction, making the battery more stable overall performance, many companies in order to this makes the process faster, take high-temperature aging, high-temperature aging but need to pay attention to control the time and temperature, as high-temperature aging than normal-temperature aging to produce more live material deterioration of the control well, the active component of a complete response, stable performance characteristics of the battery, poor control over the reaction, the electrical performance, reduce capacity, increased IR, or even the occurrence of leakage and other conditions are very likely
    Battery performance is more stable after high-temperature aging, the vast majority of lithium-ion battery manufacturers have taken the high-temperature aging process mode of operation, temperature of 45 to 50 degrees Celsius aged 1 to 3 days, and then set aside at room temperature. After high temperature aging battery potential adverse phenomena will be exposed: such as voltage variation, thickness variation, the resistance change is a direct test of the electrical safety and performance of the composite index of these cells.
    Today, most companies are using inferior battery low-end domestic divide mass production, high-temperature aging is the internal structure of the battery has become the unspoken rules of safety tests
     
        High-temperature aging just to shorten the entire production cycle of the battery, a chemical reaction just into the battery at a high temperature only accelerate the battery, the battery no more benefits, it is possible to damage the battery, preferably at room temperature and standing time in more than three weeks make positive and negative electrodes, separator, electrolyte and other full chemical reaction equilibrium, then the battery performance was more realistic.

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