1.2V Ni-MH battery is the key technology of electric vehicles

1.2V Ni-MH battery required for pure electric vehicles The functional indicators and economic indicators of 1.2V Ni-MH battery for electric vehicles include:

(1) Safety;

(2) Specific energy;

(3) Specific power;

(4) Life;

(5) Cycle price;

(6) Energy conversion efficiency.

These factors directly determine the applicability and economy of electric vehicles. Supercapacitor The advantages of supercapacitor are high mass-to-power ratio and long cycle life. The disadvantages are low mass-to-energy ratio and high purchase price. However, the cycle life is as long as 500,000 to 1 million times, so the price of a single cycle is not high. It can be connected in parallel with lead-acid batteries and energy-type lithium-ion batteries to form a power supply system with excellent performance. Lead-acid battery The production technology of lead-acid battery is mature, with good safety, low price, and waste batteries are easy to recycle.

In recent years, through new technologies, its shortcomings such as low specific energy, short cycle life, acid mist during charging, and possible lead pollution in production are being overcome, and various indicators have been greatly improved. It can not only be better used as a power source for electric bicycles and electric motorcycles, but also play a good role in electric vehicles. Lithium-ion batteries with lithium iron phosphate as the positive electrode have good comprehensive performance: high safety, no expensive raw materials, no harmful elements, a cycle life of up to 2,000 times, and have overcome the disadvantage of low conductivity. The mass specific energy of energy-type batteries can reach 120Wh/kg, and when used in parallel with supercapacitors, it can form a power source with comprehensive performance. The mass specific energy of power-type batteries is also 70-80Wh/kg, which can be used alone without parallel supercapacitors.

Lithium-ion batteries with lithium titanate as the negative electrode have very little volume change during charge-discharge, which ensures the stability of the motor mechanism and the long life of the battery; the lithium titanate electrode potential is relatively high (1.5V relative to the Li+/Li electrode), and lithium dendrites can be generated when the battery is charged, ensuring the high safety of the battery.

However, due to the high electrode potential of lithium titanate, even if it is paired with the lithium manganate positive electrode with a higher electrode potential, the battery voltage is only about 2.2V, so the specific energy of the battery is only about 50-60Wh/kg. Even so, the outstanding advantages of this battery in terms of high safety and long life are unmatched by other batteries.

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