Lithium battery capacity

　　The capacity unit of the battery is coulomb (C) or ampere-hour (Ah). There are three specific terms for characterizing battery capacity characteristics:

　　a. Theoretical capacity. Refers to the amount of electricity calculated according to the number of electrochemical equivalent of the active substance participating in the electrochemical reaction. In general, theoretically 1 electrochemical equivalent material will emit 1 Faraday charge, that is, 96,500C or 26.8Ah(the amount of 1 electrochemical equivalent material is equal to the atomic weight or molecular weight of the active material divided by the number of electrons in the reaction).

　　b. Rated capacity. In the design and production of batteries, the minimum amount of electricity that should be released by the battery under specified discharge conditions is specified or guaranteed.

　　c. Actual capacity. Refers to under certain discharge conditions, that is, under a certain discharge current and temperature, the battery can be released before the termination voltage.

　　The actual capacity of the battery is usually 10% to 20% larger than the rated capacity.

　　The size of the battery capacity is related to the number and activity of active substances on the positive and negative electrodes, and also to the structure and manufacturing process of the battery and the discharge conditions (current, temperature) of the battery. The comprehensive index of factors affecting battery capacity is the utilization rate of active substances. In other words, the more fully the active substance is used, the higher the capacity given by the battery.

　　The utilization rate of active substances can be defined as:

　　Utilization ratio =(actual battery capacity/theoretical battery capacity) x 100%

　　Or, utilization rate =(theoretical dosage of active substance/actual dosage of active substance)×100%.

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