Abstract
This paper investigates the performance changes of nickel–metal hydride (Ni-MH) battery modules for hybrid electric vehicles (HEVs) using different storage and maintenance methods. The effects of charge–discharge mode, maintenance period, rest time, charge rate, and storage state of charge (SOC) on the storage performance of Ni-MH battery modules are studied. Based on the experimental results and engineering application requirements, this paper proposes some important recommendations and methods for storage and maintenance of Ni-MH battery modules for HEVs. The experimental results show that, compared with the six benchmark methods, the proposed storage and maintenance method provides superior storage and maintenance outcomes and significantly saves maintenance time.
Highlights
At present, limited by the short range of pure electric vehicles and high cost of fuel cell vehicles, hybrid electric vehicles (HEVs) will exist for a long time as a transitional technology [1]
This paper investigates the effects of different charge–discharge modes, maintenance periods, rest time, charge rates, and storage state of charge (SOC) on the storage performance of nickel–metal hydride (Ni-MH) battery modules at room temperature, and proposes a method for storage and maintenance of Ni-MH battery modules
Ni-MH battery modules is lower than 95% of the rated value, this process should be repeated until the capacity becomes greater than or equal to 95% of the rated value
Summary
At present, limited by the short range of pure electric vehicles and high cost of fuel cell vehicles, hybrid electric vehicles (HEVs) will exist for a long time as a transitional technology [1]. There are four main types of vehicle power batteries: lead–acid batteries, nickel–metal hydride (Ni-MH). Lead–acid batteries have low cost and mature technology, but low energy density. Ni-MH batteries have mature technology, and high capacity density and reliability, but their temperature adaptability and overcharging performance are poor. Lithium-ion batteries are small in size, light in weight, and high in energy density, but their safety is poor. Related research results show that, battery technology advanced quickly in recent years, Ni-MH batteries continue to serve as an important energy storage source [4,5]. Starting with the 2015 model year, Toyota’s latest generation Prius has two versions, one with lithium-ion batteries and the other with Ni-MH batteries, but it cannot be ignored that Ni-MH batteries are still Toyota’s main choice
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