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Before carrying out the charging technology problems of lithium batteries and nickel-hydrogen batteries, the concept of a charging rate, which is represented by the letter "C", which defines the rechargeable battery capacity of 1.0 hours, is explained. For example, a battery rated at 800 mAh (mAh) can be charged at 0.5 C, so charging the battery fully with a charging current of 400 mA should theoretically be 2 hours. The so-called charging technology control is actually the ability to judge voltage and current and processing power.
The single-metal nickel-hydrogen battery is rated at 1.2 V/cell. The 1.2-volt rechargeable battery is often referred to as a single-cell nickel-hydrogen battery and should be charged at a voltage of up to 1.5-1.6 V/k. There are several different techniques that can be used to determine when to interrupt charging. Several current technologies include: peak voltage detection, negative Δ voltage, Δ temperature (dT/dt), temperature threshold, and timer. How to do this is not described here. Can be "Baidu" out. It should be noted that high-end chargers may integrate these technologies into the same NiMH battery charger.
The peak voltage detection circuit terminates charging at a predetermined peak with a predetermined peak voltage of 1.5 V/node, which can charge the battery to approximately 97%.
The charging principle of a lithium-ion battery is different from that of a nickel-hydrogen battery. The usual charging method is to charge the battery to 4.2 V/section by trickle charging at 0.5C to 1C. During the charging process, the temperature rise of the lithium-ion battery should be kept below 5 °C, and a higher temperature rise indicates that self-ignition may be caused. During the charging cycle of the charging part, the battery temperature rises the most and is most likely to spontaneously ignite. Because the current and voltage are changed step by step during the charging process of the lithium battery, the lithium battery charger is usually a smart charger that can monitor and control the charging process of the lithium ion battery in real time. In the constant current phase, the lithium battery generally increases the voltage of the lithium battery to 4.2 V/section in a fast charge mode. Thereafter, it uses a constant voltage trickle charge. If the trickle charge is not used, the lithium battery will only charge to about 85%. This is lower than the voltage of a NiMH battery.
