3. Charge/discharge multiplier (charge/discharge rate, unit: C)
Charge/discharge multiplier: a measure of how fast or slow the charge is. This indicator affects the continuous and peak currents of a lithium-ion battery when it is working, and its unit is usually C (abbreviation of C-rate), such as 1/10C, 1/5C, 1C, 5C, 10C, etc.. For example, if the rated capacity of a battery is 20Ah, and if its rated charge/discharge multiplier is 0.5C, it means that this battery, can be charged and discharged repeatedly with a current of 20Ah*0.5C=10A, up to the cut-off voltage of charging or discharging. If its maximum discharge multiplier is 10C@10s and its maximum charge multiplier is 5C@10s, then this battery can be discharged with a current of 200A for a duration of 10 seconds and charged with a current of 100A for a duration of 10 seconds.
The more detailed the definition of the charging and discharging multiplier index, the greater the significance of guidance for use. Especially for lithium-ion batteries, which are used as the power source of electric transportation vehicles, the continuous and pulse multiplication indexes under different temperature conditions need to be defined to ensure that lithium-ion batteries are used within a reasonable range.
4. Voltage (unit: V)
The voltage of lithium-ion battery has some parameters such as open circuit voltage, operating voltage, charging cut-off voltage, discharging cut-off voltage and so on.
Open-circuit voltage: that is, the battery is not connected to any external load or power supply, measure the potential difference between the positive and negative terminals of the battery, this is the open-circuit voltage of the battery.
Working voltage: is the battery external load or power supply, in the working state, there is a current flow, measured by the potential difference between the positive and negative electrodes. Working voltage is related to the composition of the circuit and the working state of the equipment, is the value of change. Generally speaking, due to the existence of the internal resistance of the battery, the working voltage is lower than the open-circuit voltage in the discharged state, and higher than the open-circuit voltage in the charging state.
Charge/discharge cut-off voltage: It is the maximum and minimum working voltage that the battery is allowed to reach. Exceeding this limit will cause some irreversible damage to the battery, resulting in the degradation of battery performance, and in serious cases, even causing fire, explosion and other safety accidents.
Post time: Nov-14-2023