Abstract
Lithium-ion (Li-ion) batteries have been competitive in Electric Vehicles (EVs) due to their high energy density and long lifetime. However, there are still issues, which have to be solved, related to the fast-charging capability of EVs. The pulsed current charging technique is expected to improve the lifetime, charging speed, charging/discharging capacity, and the temperature rising of Li-ion batteries. However, the impact of the pulsed current parameters (i.e., frequency, duty cycle, and magnitude) on characteristics of Li-ion batteries has not been fully understood yet. This paper summarizes the existing pulsed current modes, which are positive Pulsed Current Mode (PPC) and its five extended modes, and Negative Pulsed Current (NPC) mode and its three extended modes. An overview of the impact of pulsed current techniques on the performance of Li-ion batteries is presented. Then the main impact factors of the PPC strategy and the NPC strategy are analyzed and discussed. The weight of these impact factors on lifetime, charging speed, charging/discharging capacity, and the temperature rising of batteries is presented, which provides guidance to design advanced charging/discharging strategies as well as to determine future research gaps.
Highlights
Electric Vehicles (EVs) have been an important part of the automotive industry due to their benefits in energy and environmental issues by decreasing the dependence on oil and reducing air pollution
This paper presents a comprehensive review of the pulsed current technique
The results showed that Constant Current (CC)-CVNP with lower amplitude and fewer number of the negative pulse could reduce the capacity loss
Summary
Electric Vehicles (EVs) have been an important part of the automotive industry due to their benefits in energy and environmental issues by decreasing the dependence on oil and reducing air pollution. The issues with EVs they are most concerned about are the total driving mileage, charging time, driving mileage after each charge, and the safety during battery charging/discharging processes, which are related to battery lifetime, charging speed, charging/discharging capacity, and the temperature rising, respectively [3]. To improve these characteristics of Li-ion batteries, the research on advanced charging strategies is a critical issue [4].
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