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Although the charging cost of electric vehicles is relatively low compared with traditional fuel vehicles, due to the high price of electric vehicles and the relatively short service life of batteries, the replacement of batteries will also be a huge expense, so the cost barrier 'battery maintenance' has become a 'roadblock' for the popularization of electric vehicles. For an electric vehicle, the more natural its battery range is, the more convenient it will be. The larger the battery range is, the lower the charging frequency will be.

However, the life of electric cars depends on the motor. Different drive motors have different costs. If a DC brushless motor is used, the on-board power supply can be directly supplied to the motor, and the thyristor type controller chopping mode is used for speed regulation.

The battery life includes' dry storage life 'and' wet storage life '. These two concepts are only for the self-discharge size of the battery, not the actual service life of the battery. The real life of the battery refers to the actual use time of the battery.

For the primary battery, the battery life is the working time (related to the discharge rate) that characterizes the rated capacity.

For the secondary battery, the battery life is divided into charge and discharge cycle life and wet shelving service life.

The charge-discharge cycle life is an important parameter to measure the performance of secondary battery. It is called a cycle (or a cycle) to undergo a charge and discharge. Under a certain charge-discharge system, the number of charge-discharge times that the battery can withstand before the battery capacity drops to a specified value is called the charge-discharge cycle life of the secondary battery. The longer the charge-discharge cycle life, the better the performance of the battery. Among the commonly used secondary batteries at present, the cycle life of cadmium nickel battery is 500~800 times, that of lead acid battery is 200~500 times, that of lithium ion battery is 600~1000 times, and that of zinc silver battery is very short, about 100 times.

The charge-discharge cycle life of secondary battery is related to the discharge depth, temperature, charge-discharge system and other conditions. The so-called "discharge depth" refers to the percentage of the discharged capacity of the battery in the rated capacity. By reducing the depth of discharge (i.e. "shallow discharge"), the charging and discharging cycle life of the secondary battery can be greatly extended.

The service life of wet storage is also one of the important parameters to measure the performance of secondary batteries. It refers to the time from the beginning of the charge-discharge cycle to the end of the charge-discharge cycle life of the battery after adding the electrolyte (including the time when the battery is in the discharge state during the charge-discharge cycle). The longer the service life of wet storage, the better the battery performance. Among the commonly used batteries at present, the service life of cadmium nickel battery in wet storage is 2-3 years, lead-acid battery is 3-5 years, lithium-ion battery is 5-8 years, and zinc-silver battery is the shortest, only about 1 year.

In addition, the performance of the battery includes: low temperature performance, overcharging resistance, safety performance, etc.

In recent years, the sales of new energy vehicles in China have increased explosively, and the number of power batteries beyond the warranty period has also shown an increasing trend. At present, the battery warranty period of new energy vehicles on the market, including BYD, has reached or even exceeded the provisions of the battery warranty period for new energy tax-free vehicles. Take BYD Qin as an example. At present, the manufacturer gives a "6-year or 150000 km warranty for the whole vehicle and a lifetime warranty for the battery cell". In addition to providing a 3-year and 100000 km warranty for the whole vehicle, SAIC Roewe E50 also specifically provides a 5-year and 100000 km warranty for the battery and other core components. BAIC Motor Co., Ltd. provides a 5-year commitment of unlimited kilometers for its E150ev battery.

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