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Views: 0 Author: Site Editor Publish Time: 2026-06-29 Origin: Site
With the global acceleration of energy conservation, emission reduction and green transportation transformation, electric vehicles (EVs) have become the mainstream development direction of the automotive industry. As the core power component of electric vehicles, the performance of power batteries directly determines the vehicle’s cruising range, power output, service life and driving safety. Nickel-Metal Hydride (NiMH) batteries, as a mature secondary battery technology, have outstanding advantages such as high safety, no heavy metal pollution, good cycle performance and strong environmental adaptability. Although lithium-ion batteries dominate the current new energy vehicle market, NiMH batteries still maintain important practical application value in hybrid electric vehicles (HEVs), commercial electric vehicles and low-speed electric vehicles due to their unique comprehensive performance. This paper systematically analyzes the electrical characteristics and core performance of NiMH batteries, explores their practical application scenarios in electric vehicles, and summarizes their performance advantages, existing limitations and optimization development trends.
NiMH batteries rely on the reversible electrochemical reaction between nickel hydroxide positive electrodes and hydrogen storage alloy negative electrodes to realize charge and discharge cycles. Different from other power batteries, their performance characteristics are highly matched with the working conditions of partial electric vehicles, forming unique application advantages in the field of vehicle power supply.
Vehicle power batteries face complex and variable working environments, including high-temperature driving, bumpy vibration, accidental extrusion and frequent charge-discharge switching, which put forward extremely high requirements on battery safety. NiMH batteries adopt aqueous electrolyte system, which has low chemical activity and no risk of spontaneous combustion and explosion under conventional and extreme working conditions. Compared with lithium-ion batteries that are prone to thermal runaway, NiMH batteries have excellent thermal stability and structural safety. Even in the case of over-discharge, slight extrusion and high-temperature cycling, they will not produce violent chemical reactions or safety hazards. In addition, the battery shell and internal structure have strong vibration resistance and impact resistance, which can adapt to the long-term bumpy working state of vehicles and ensure stable operation during driving.
Cycle life is a key indicator to measure the service economy of vehicle batteries. Qualified NiMH batteries can achieve more than 800 charge-discharge cycles under standard working conditions, and the capacity retention rate remains above 80% after long-term cycling. In the frequent start-stop and instantaneous charge-discharge working mode of hybrid electric vehicles, NiMH batteries show excellent durability. Their stable reversible electrochemical reaction can adapt to the intermittent power supply and energy recovery scenario of vehicles, and the capacity attenuation rate is slow in long-term service. This characteristic makes NiMH batteries have lower replacement frequency and higher service life in vehicle applications, reducing the later maintenance cost of electric vehicles.
NiMH batteries have a wide operating temperature range, which can maintain stable charge-discharge performance in the environment of -20℃ to 55℃, and have good low-temperature discharge capacity, avoiding the problem of severe power attenuation of some batteries in cold winter. At the same time, NiMH batteries do not contain toxic and harmful heavy metals such as lead and cadmium, and their positive and negative electrode materials and electrolytes are environmentally friendly and recyclable. They fully comply with global automotive environmental protection standards and waste battery recycling regulations, with low environmental pollution risk in the whole life cycle of production, use and scrapping.
Compared with mainstream lithium-ion batteries, NiMH batteries have obvious performance shortcomings. Their energy density is relatively low, generally between 60–120 Wh/kg, which is far lower than that of ternary lithium and lithium iron phosphate batteries, resulting in limited battery capacity and vehicle cruising range under the same volume and weight. In addition, NiMH batteries have a certain self-discharge rate, and the power attenuation is relatively fast during long-term parking. Their high-rate charge-discharge performance is insufficient, and they cannot meet the high-power acceleration demand of pure electric vehicles with ultra-long cruising range.
Restricted by energy density and power performance, NiMH batteries are no longer suitable for high-end long-range pure electric vehicles, but they show high application value in many segmented electric vehicle fields relying on their high safety, low cost and strong durability.
Hybrid electric vehicles are the most mature and largest application scenario of NiMH batteries. Different from pure electric vehicles that rely on batteries for full power output, HEVs adopt the hybrid power mode of engine and motor. The battery mainly undertakes the functions of instantaneous power assistance, brake energy recovery and low-speed pure electric driving, without the need for high energy density and ultra-long cruising range. NiMH batteries perfectly match the frequent short-cycle charge-discharge working characteristics of HEVs. Taking the classic hybrid models as an example, the NiMH battery power supply system has been used in many mass-produced HEV models for a long time, with stable operation effect and extremely low battery failure rate, verifying its excellent adaptability in hybrid vehicles.
Low-speed electric vehicles, including community shuttle vehicles, scenic spot sightseeing vehicles, urban sanitation vehicles and low-speed household electric vehicles, have low requirements for vehicle speed and cruising range, and pay more attention to battery safety, cost and service life. NiMH batteries have low manufacturing cost and excellent safety performance, and can meet the daily low-load and short-distance driving demand of low-speed electric vehicles. Moreover, their good cycle durability reduces the replacement cost of low-speed vehicle power batteries, making them cost-effective power supply solutions for low-speed electric vehicles.
For commercial special electric vehicles that focus on operational stability and safety, such as airport shuttle vehicles, logistics distribution vehicles and engineering electric vehicles, NiMH batteries also have certain application advantages. Such vehicles work in fixed scenarios with stable load, and have extremely strict requirements on battery safety and fault tolerance rate. The high stability and low failure rate of NiMH batteries can ensure the continuous and safe operation of commercial vehicles, avoiding operational losses caused by battery failure and safety accidents.
To further expand the application scope of NiMH batteries in the electric vehicle industry and make up for their inherent performance defects, targeted optimization and improvement can be carried out from material formula, structural design and battery management system.
In terms of material optimization, high-capacity hydrogen storage alloy materials and high-activity nickel hydroxide positive electrode materials can be adopted to effectively improve the energy density of NiMH batteries and reduce self-discharge rate. Optimizing the electrolyte formula can enhance the high and low temperature resistance of the battery and improve the discharge efficiency under extreme temperature environments. In terms of structural design, adopting a compact sealed battery structure can reduce internal resistance, improve the battery’s high-rate charge-discharge capacity, and further enhance structural vibration resistance and leakage resistance.
In terms of system matching, supporting intelligent battery management system (BMS) is an important means to optimize the application effect of NiMH batteries. The BMS system can accurately monitor the real-time voltage, current, temperature and remaining power of the battery, realize balanced charge and discharge of each single battery, avoid over-charge and over-discharge failure, effectively prolong the battery cycle life, and improve the overall power supply stability of the vehicle battery pack.
NiMH batteries have prominent advantages in safety, cycle durability, environmental protection and cost, and have irreplaceable practical application value in hybrid electric vehicles, low-speed electric vehicles and commercial special electric vehicles. Although their low energy density limits their application in high-end long-range pure electric vehicles, they still occupy an important position in the segmented electric vehicle market with high comprehensive cost performance and high stability.
With the continuous innovation of battery material technology and system integration technology, the performance of NiMH batteries is constantly optimized and improved. In the future, with the further upgrading of hybrid vehicle technology and the standardized development of low-speed electric vehicle industry, NiMH batteries will continue to exert their application advantages in the field of medium and low-speed new energy vehicles. At the same time, relying on green and recyclable characteristics, NiMH batteries will also meet the increasingly stringent environmental protection requirements of the automotive industry, and maintain stable market development space in the diversified power battery system of electric vehicles.
