For an electric car, the greater the battery life will naturally bring more convenience, the larger the cruising range means the lower the frequency of charging.
The charge and discharge cycle life of the secondary battery is related to conditions such as depth of discharge, temperature, and charge and discharge system. The term ''discharge depth'' refers to the percentage of the capacity discharged by the battery to the rated capacity. By reducing the depth of discharge (ie, ''shallow discharge''), the charge and discharge cycle life of the secondary battery can be greatly extended.
Although the cost of charging an electric car is lower than that of a conventional fuel car, the price of the electric car itself is high, and the battery life is relatively short. It is also a huge expense to replace the battery. Battery repair and maintenance has become the 'blocker' of the popular electric car. For an electric car, the greater the battery life 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 the battery is the length of time the battery is actually used.
For a primary battery, the life of the battery is a function of the operating time (depending on the magnitude of the discharge rate) that gives the rated capacity.
For the secondary battery, the life of the battery is divided into two types: the charge and discharge cycle life and the wet shelf life.
The charge and discharge cycle life is an important parameter to measure the performance of secondary batteries. Subject to one charge and discharge, it is called a cycle (or a cycle). Under a certain charge and discharge system, the number of charge and discharge cycles that the battery can withstand before the battery capacity drops to a certain value is called the charge and discharge cycle life of the secondary battery. The longer the charge and discharge cycle life, the better the performance of the battery. In the commonly used secondary batteries, the charge and discharge cycle life of the cadmium nickel battery is 500 to 800 times, the lead acid battery is 200 to 500 times, the lithium ion battery is 600 to 1000 times, and the zinc silver battery is short, about 100 times.
The charge and discharge cycle life of the secondary battery is related to conditions such as depth of discharge, temperature, and charge and discharge system. The term ''discharge depth'' refers to the percentage of the capacity discharged by the battery to the rated capacity. By reducing the depth of discharge (ie, ''shallow discharge''), the charge and discharge cycle life of the secondary battery can be greatly extended.
Wet shelf life is one of the important parameters to measure the performance of secondary batteries. It refers to the time when the battery is charged and discharged after the electrolyte is added until the end of the charge and discharge cycle life (including the time during which the battery is in the discharge state during the charge and discharge cycle). The longer the wet shelf life, the better the battery performance. Among the commonly used batteries, the cadmium nickel battery has a wet shelf life of 2 to 3 years, a lead-acid battery of 3 to 5 years, a lithium ion battery of 5 to 8 years, and a zinc-silver battery of the shortest, 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 or exceeded the battery warranty period for 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 is committed to providing a five-year, unlimited-kilometer commitment to its E150ev battery.
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