How long can a new energy car battery last?

Although the cost of charging an electric car is lower than that of a conventional fuel car, the cost of the replacement of the battery is a huge expense because of the high price of the electric car itself and the relatively short battery life. Battery repair and maintenance has become the 'blocker' of the popular electric car. For an electric car, the greater the battery life range will naturally bring more convenience, the larger the cruising range means the lower the frequency of charging.

However, the life of an electric car is determined by the motor. The driving motor is different, and the cost is also very different. If a DC brush motor is used, the vehicle power supply can be directly supplied to the motor, and the motor is controlled by the thyristor controller chopper mode.

Battery life has ''dry storage life'' and ''wet storage life''. These two concepts are only for the size of the battery self-discharge, not the actual life of the battery. The true life of a battery is the length of time it takes for the battery to actually be used.

For a battery, the battery life is characterization of nominal capacity is given working time (and the size of the discharge rate).

For secondary battery, the battery life points to charge and discharge cycle life and wet on the service life of the two.

Charge and discharge cycle life, it is an important measure of the secondary battery performance. Subjected to a charge and discharge, is called a loop (or a cycle).Under the certain charge and discharge system, battery capacity fell to a specified value, before the battery tolerated cycle count, called secondary battery charge and discharge cycle life. The longer the charge and discharge cycle life, the better the performance of battery. In the current commonly used secondary battery, nickel cadmium battery charge and discharge cycle life of 500 ~ 800 times, lead-acid battery 200 ~ 500 times, Lithium ion batteries600 ~ 1000 times, zinc silver battery is very short, about 100 times or so.

The secondary battery charging and discharging circle life and discharge condition such as the depth, temperature, charge and discharge formats. "Discharge depth" refers to the capacity of battery release percentage of rated capacity. Reduce the depth of discharge (shallow discharge), the secondary battery charge and discharge cycle life can be greatly extended.

Wet shelf life is one of the important parameters to measure the performance of secondary batteries. It refers to begin after joined the electrolyte battery charge and discharge cycle until the charge-discharge cycle life end time (including in the process of charging and discharging cycle battery discharge in wet on time).Wet shelve the longer service life, the better the performance of the battery. In at present commonly used batteries, nickel cadmium battery wet on service life is 2 ~ 3 years, 3 ~ 5 years lead-acid battery, lithium ion battery 5 ~ 8 years, zinc silver batteries, the shortest is only about 1 year.

In addition, the performance of the battery is: low temperature performance, overcharge resistance, safety performance and so on.

In recent years, the sales volume of new energy vehicles in China has exploded, and the number of power batteries exceeding the warranty period has also shown an increasing trend. The new energy vehicles currently on the market, including BYD, have reached the battery warranty period even exceeding the battery warranty period of the new energy-free models. Take BYD Qin as an example. At present, the factory gives the warranty of '6 years or 150,000 km of the whole vehicle and the lifetime warranty of the battery core', while the SAIC Roewe E50 provides a warranty of 3 years and 100,000 kilometers for the whole vehicle. It also provides a five-year, 100,000-kilometer warranty for core components such as batteries. And Beiqi offers a five-year, unlimited-kilometer commitment to its E150ev battery.

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