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This paper presents an offline state-of-health (SoH) estimation based on charge transfer resistance for high-power lithium-ion (Li-ion) batteries, such as lithium iron phosphate (LFP) batteries. As shown in the experimental results, the charge transfer resistance has a great aging change with battery degradation and good abilities against state-of-charge (SoC) drift and external resistance variation...
Fuel cell (FC)/lithium-ion battery hybrid power system (HPS) gradually becomes a powerful energy source in the future. This paper presents a digital boost converter for FC current regulation in the HPS with a dual-battery energy storage unit (ESU). The digital boost converter regulates the FC current in order to control the FC power generation. Simulations have been conducted in PSIM environment,...
This paper proposes a robust, intelligent constant current-constant voltage (CC-CV) charger for fast charging an aging Lithium-ion battery. Increasing the charging current in the CC regime cannot guarantee the short charging time, so an optimal charging current exists in the CC-CV method. The optimal charging current changes with battery degradation, so this paper figures out a way to find the optimal...
Due to the small ohmic resistance, such as the LFP battery, off-line state-of-health (SOH) estimation based on ohmic techniques faces a great challenge on measurement difficulty. The inaccurate measurement result of the ohmic resistance can cause a severe SOH error. This paper studies the influences of battery external resistance on the off-line SOH estimations using different model parameters in...
This paper proposes an aging-compatible inductor- based equalization mechanism for LFP batteries. Due to the characteristic of flat voltage curve, voltage equalization does not always successfully balance a series-connected battery pack. The proposed inductor-based equalization mechanism is developed to smartly balance battery voltage in the right state-of-charge (SOC) region regardless of the extent...
Following the trend of eco-conscious, the automakers tend to use high-voltage packs in the electric vehicle or hybrid electric vehicle. The packs are formed by battery cells in series and parallel connections. Because of the variation of battery production, their capacity, impedance, lifetime and chemistry characteristic vary with ambient temperature. When the batteries are charged or discharged as...
This paper presents a new hybrid power system with battery depth-of-discharge (DOD) management for extending battery cycle life and system service time. The proposed power system consists of a power management system, a dual-battery unit, a fuel cell (FC) stack, and two dc/dc unidirectional power converters. The dual-battery unit serves as the primary power source, while the FC stack serves as the...
The SOH of batteries is critical information for electric vehicle (EV) and hybrid electric vehicle (HEV) systems. This paper proposes an SOH estimation system based on time-constant-ratio measurement. There are two reasons of choosing time-constant as aging criterion. First, time-constant represents the response speed of terminal voltage during charging and discharging. Second, time-constant represents...
A varying current charger for rechargeable Lithium-ion battery is implemented to maintain a predefined energy bound which is consumed by the overpotential equivalent resistance. For aged Lithium-ion batteries, the traditional CCCV charging method charges the battery with the same constant current no matter how the battery internal overpotential resistance increases. The varying current charger developed...
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