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Explanation of battery-related terms. ■BOL:Beginning of Life
The initial state of the battery when it is assembled. EOL:End Of Life refers to the state of the battery after it has deteriorated. ■C rate
When the current value at which the rated capacity is discharged (charged) in 1 hour is 1C, this represents how many times the current that can be passed in 1 hour, and can be expressed by the following formula.
For example, for a battery with a capacity of 4Ah, 4A is 1C, and 8A is 2C, and the higher the rate, the higher the current that can be discharged (charged) per unit time. ■CCCV:Constant Current-Constant Voltage
Charging method with constant current and constant voltage. There is also a method called CPCV:Constant Power-Constant Voltage, which charges with constant power and voltage. ■CCV:Closed circuit voltage
The voltage value between both terminals of the battery when a load is connected to the battery and current is flowing. It indicates a value smaller than OCV, and the value becomes smaller when the current flowing is large or the SOC is small.
Also called on-load voltage. ■OCV:Open circuit voltage
The voltage between both terminals of a battery when no load is connected and no current is flowing. Also called off-load voltage. ■SOC:State of Charge
This refers to the charge rate, with a fully charged state defined as 100% and a fully discharged state defined as 0%. Normally, battery capacity is expressed in Ah or Wh, but this is converted into a percentage.
For example, if a battery is fully charged at 5000mAh and the current battery capacity is 3000mAh, the SOC is 60%. ■SOH:State of Health
This is an index of the deterioration state of the battery. It expresses the full charge capacity at the time of deterioration as a percentage, with the initial full charge capacity being 100%.
For example, if the initial full charge capacity is 5000mAh and the SOH is 50%, then even if it is fully charged, it will only be 2500mAh. ■SOF:State of Function
It expresses the operating state of an electrical device or the discharge capacity. ■SEI:Solid Electrolyte Interphase
A thin film that forms on the surface of the negative electrode. It plays a role in preventing the active material of the negative electrode from dissolving into the electrolyte.
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