Li-ion battery charger knowledge, the requirements of lithium batteries on the charger. At present, lithium-ion batteries are very widely used, and thus as the supporting equipment for lithium-ion batteries - charger, is also bound to generate great market demand, thus becoming a hot spot for the development of various power supply manufacturers. Lithium batteries choose the appropriate charger, charging in strict accordance with the requirements. Therefore, a safe and effective lithium-ion battery charger for lithium-ion batteries is a must and is necessary.

　　Lithium battery charger knowledge

　　It should be noted that the charging process of lithium-ion batteries is completely different from that of NiCd and NiMH batteries, which is a complex electrochemical reaction process. Therefore, a special charger needs to be configured for charging. Even if it is a special lithium battery charger, due to the very strict requirements for charging voltage tolerance (generally 1%), it is necessary to distinguish whether the voltage of the battery is 4.1V or 4.2V when fully charged.

　　The charger plays a vital role in the life of the lithium battery. When the charging voltage or charging current is too high can damage the lithium-ion battery or even make it obsolete. So it is often said that a battery is sometimes actually not bad, but bad charging. At the same time, power electronics technology and switching power supply technology continue to develop and change the traditional design of linear power supply ideas. Therefore, improving the research of lithium-ion battery chargers, improving their reliability and operating efficiency, ensuring the safety of the use of the battery and extending the battery's life have an important practical engineering significance.

The requirements of lithium battery chargers

　　The li-ion battery charger is a charger specifically used to charge lithium-ion batteries. Lithium-ion batteries have high requirements for chargers and require protection circuits, so lithium-ion battery chargers usually have a high degree of control precision and can charge lithium-ion batteries at constant current and voltage.

　　(①Charging to be full and terminate charging voltage accuracy requirement of ±1%.

　　② not to overcurrent during charging and discharging, and need to be designed with short circuit protection.

　　③Reach the termination discharge voltage to prohibit further discharge. The termination discharge voltage accuracy control is in ± 3% or so.

　　④ Pre-charge the deeply discharged battery (not lower than the termination discharge voltage) in a low-current manner before charging.

　　⑤ To ensure stable and reliable battery operation and prevent interference from transient voltage changes, its internal design should have a delay circuit for overcharge, over discharge and overcurrent protection to prevent instability caused by transient interference.

　　(6) factors affecting the safe and effective charging of lithium batteries are voltage, current and temperature. Therefore, the charger design should take care of the control of these three factors.

　　(7) Li-ion battery chargers should also have an adaptive power path management function when the system side of the electricity exceeds the supply limit of the input power to ensure that the Li-ion battery can actively start the discharge function while supplying its required power to the system side.

　　Summary: Li-ion batteries require a constant current and constant voltage charging method. In order to effectively use the battery capacity, the Li-ion battery needs to be charged to the maximum voltage, but over-voltage charging will cause battery damage, which requires a high degree of control accuracy. In addition, for the low voltage battery needs to be pre-charged, the charger is best with thermal protection and time protection to provide additional protection for the battery.