The four stages of charging 12V27A battery

　　As the current is released, the operating voltage of the rechargeable battery decreases and the specificity of the organic chemistry decreases. In order to more effectively maintain the characteristics of lithium batteries, lithium batteries are generally controlled according to four stages: trickle charging (low voltage pre-charging), constant current charging, constant voltage charging and charging termination. The basic adjustment of the lithium battery charging head is the special current and battery charging working voltage, which ensures safe charging. Adding other battery charging functions is to increase the number of battery cycles and simplify the actual operation of the charging head, including applying trickle charging, battery voltage testing, critical current limiting, charging after charging and turning off the charging head, and charging after partial charging and discharging. The charging method of lithium battery is a constant current limited power supply operated by ic chip. The typical charging method is to check the working voltage of the rechargeable battery. If the working voltage is less than 3V, it should be precharged first, and the current is 1/10 of the set current. , the working voltage rises to 3V, and then enters the entire charging process. The entire battery charging adjustment process is as follows: set the current for constant current charging. When the battery voltage rises, it changes to constant current charging to maintain the working voltage of the battery charging. At this point, the current slowly decreases, and when the current is reduced to 1/10 of the current set, the battery is charged. The four stages of charging a lithium-ion battery indicate: Stage 1: Trickle Charging - Trickle charging is used to precharge (recharge the battery) to the rechargeable battery module. When the battery voltage is less than 3v, choose trickle charging, and the trickle charging current is one-tenth of the constant current (for example, the trickle charging current is 100ma). Stage 2: Constant Current Power Battery Charging - When the battery's voltage rises above the trickle charge threshold, the current rises to achieve constant current power battery charging. The charging current of a constant current battery is in the middle. As the constant current power battery charges, the battery voltage gradually increases. Stage 3: Constant current battery charging - When the battery voltage rises, the constant current battery is charged and the constant current battery charging chain begins. The current is based on the saturation state of the lithium-ion core, and the recurrent during the entire battery charging process gradually decreases from the highest value. (c is a way to compare the current and the capacity of the rechargeable battery, for example, the rechargeable battery is 1000mah, 1c is 100ma). Stage 4. Battery charging stops. There are two typical charge termination methods: minimum current resolution or time (OR). The minimum current method is used to monitor the current of the constant current source battery charging link and stop charging when the current is lower than the current. The second method is to stop the entire battery charging process after two hours. The four-ring charging method is used to charge and discharge the rechargeable battery for up to 3 hours. A large number of safety precautions have also been chosen for the premium charging head. For example, if the battery temperature exceeds a specific dialog box (generally 0c to 45c), battery charging will stop. After charging, if the detected battery voltage is less than the battery will be charged.

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