Central charging of lithium batteries for power tools

Although some Li-ion batteries with high power density are optimized for 10C discharge, the maximum charging rate of most commercial Li-ion batteries are limited to 3C , . High rate charging induced side reactions, such as lithium plating, mechanical effects and heat generation, which will accelerate the battery degradation, .

The complexity (and cost) of the charging system is primarily dependent on the type of battery and the recharge time. This chapter will present charging methods, end-of-charge-detection techniques, and charger circuits for use with Nickel-Cadmium (Ni-Cd), Nickel Metal-Hydride (Ni-MH), and Lithium-Ion (Li-Ion) batteries.

Analysis of typical strategies for rate capability improvement in electrolyte. In conclusion, the applications of low-viscosity co-solvents, high-concentration electrolytes, and additives that can obtain desirable SEI properties for fast charging are effective strategies to improve the high-rate charging of lithium-ion batteries.

In the realm of battery charging, charging methods are usually separated into two gen-eral categories: Fast charge is typically a system that can recharge a battery in about one or two hours, while slow charge usually refers to an overnight recharge (or longer).

Essentially, the charging control should reduce the charging time with minimal degradation, which requires the combination of battery specifications such as nominal capacity, maximum C-rate, cut-off voltage and operation temperature, .

Charging with high rates tends to accelerate degradation of Li-ion battery ascribe to the inhomogeneous current density, temperature distribution at the macroscale as well as the restricted diffusion kinetics of Li+ at the microscale .