What are the requirements for the charger when charging Li-ion batteries?

Li-ion battery charging method, what are the requirements for the charger? I believe that the lithium-ion battery charger has gradually become irreplaceable in everyone's life. It is used in a series of electronic products such as smart phones, digital cameras, and heating products. For cost and convenience, lithium-ion battery chargers generally use black plastic casings for heat dissipation and temperature control. The components inside the lithium-ion battery charger also have their own operating temperature. Li-ion battery charger Li-ion battery charger is a charger designed for charging lithium-ion batteries. Lithium-ion batteries have higher requirements for chargers and need to protect the circuit. Therefore, lithium-ion battery chargers generally have high control accuracy and can charge lithium-ion batteries with constant current and voltage. The technical parameters are as follows: Input voltage: 100-240v Input frequency: 50-60hz Single battery charging voltage: 4.2v lithium ion battery charging. The charging process of PNG lithium-ion battery charger is divided into three stages: 1. The charging IC should first detect whether there is an output short-circuit or overload protection method. If the system is normal, check whether the battery voltage is 3V. 2. Constant current fast charge stage: rise to 4.2v; 3. Constant voltage stage: after the battery rises to 4.2v, the voltage does not increase, and the charging current decreases until it reaches 10% of the constant current to stop charging. The future lithium-ion battery charger will develop towards a faster, safer and more comprehensive charging management system. What are the requirements of the charger for lithium-ion batteries? In order to prevent overcharging of lithium-ion batteries, lithium-ion batteries must be designed with a protection circuit. Li-ion battery charger JC is suitable for single and 2~4 battery packs. The basic requirements of lithium-ion battery chargers are as follows: (1) The charge must be full, and the voltage accuracy at the end of the charge is required to be about ±1%; during the charging and discharging process but the flow is large, short circuit protection must be designed; (3) Stop the discharge voltage, prohibit Continue to discharge, the discharge voltage accuracy is controlled at ±3%; (4) The battery is deeply discharged with a small current before charging (not less than the termination of the discharge voltage); in order to ensure the stable and reliable operation of the battery, prevent the interference of transient voltage changes , The internal delay circuit with overcharge, overdischarge, and overcurrent protection should be designed to prevent transient interference from causing instability; its own power consumption (the charger should be energized when charging and discharging). The power consumption of a single battery charger is generally less than 10uA, while the power consumption of a multi-battery pack is generally about 20uA. When the discharge is terminated, it is in the closed state, and the general consumption is less than 2uA. Lithium-ion battery charger has simple circuit, few external components, and takes up less space. Generally, it can be used as battery or battery pack; lithium-ion battery charger is cheap. The factors that affect the safe and effective charging of lithium-ion batteries are voltage, current and temperature. Therefore, these three factors should be paid attention to and controlled in the design of the charger. Li-ion battery chargers should also have adaptive power supply path management functions. When the power consumption of the system side exceeds the power supply limit of the input power supply, the lithium-ion battery should be able to actively start the discharge function to supply the required power to the system side. How to charge lithium-ion batteries correctly? The proper charging temperature for lithium-ion batteries is 0~45℃. If charging 0.5c, the temperature rise of 1C can be set to 90°C. At this time, the working environment temperature of the charger is 35°C, which is the best temperature for charging the lithium-ion battery. Lithium-ion batteries are easy to activate. Only after 3 to 5 normal charge and discharge cycles can the battery be activated and return to normal capacity. Lithium-ion batteries work within a safe voltage range of 2.8v to 4.2v. Below or higher than this voltage range, the lithium ions in the battery will become very unstable and may even cause accidents. A special charger is required to keep the battery within a safe range. The charger charges the lithium-ion battery with a constant current. As the battery voltage increases, the charger will also increase the charging voltage to speed up the charging speed. 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