With the rise of new energy vehicles, pure electric vehicles are getting more and more attention. However, the biggest concern of consumers who buy pure electric vehicles remains the range and the number of cycles of the battery pack. Range directly affects the range of use, while manufacturers usually use the number of battery charging cycles to illustrate battery life. So, which of these two parameters is more important for batteries?

First, let's look at range. Every new energy vehicle will announce parameters such as battery energy, NEDC range and NEDC power consumption when it hits the market. However, according to the formula, there will be a certain gap between the actual mileage and the published data, which is actually a bit lower than the published NEDC range.The test method of NEDC range is to let the electric car be fully charged, and then test it in accordance with the NEDC conditions until the electric car is dead, and record the range. After that, the vehicle has to be recharged by slow charging until it is fully charged, thus recording the power consumed by the grid, and finally converting the power consumed by the grid with the test mileage to get the NEDC energy consumption.

However, battery pack energy and fuel tank are not the same concept. The same battery that is discharged in one hour is not the same as the same battery that is discharged in three hours. According to a more specialized term, the higher the discharge rate of the battery, the higher the current, the less power will actually be discharged.NEDC conditions are simulated by the user's stop-and-go conditions, but in fact, the real conditions when we use the vehicle are much more intense than this. In addition, battery energy is also affected by factors such as ambient temperature. For example, the true range is completely different in summer and winter. Therefore, although the range parameter is important, it needs to be treated rationally, and you need to be mentally prepared for this before purchasing a vehicle.

Next, let's look at the number of cycles. Lithium-ion batteries have two lifespans, a cycle life and a storage life. The more cycles or the longer the storage time, the greater the loss of battery life. For the cycle, it is divided into two processes, the first is a dynamic process, which is the reciprocal motion made by lithium ions shuttling between the positive and negative electrodes; the other is a static process, which is the storage of lithium-ion batteries under different SOCs, that is, the placement of the battery under a certain SOC. The loss of lithium battery life is either a loss of active lithium or a loss of active material.

Why do manufacturers often use the number of cycles as a standard for battery life? In fact, manufacturers consider that such publicity is easy to be understood and accepted by consumers. Secondly, some lithium manufacturers only assess the number of cycles. In real life, the battery range of electric vehicles after a few years of use will be greatly reduced, especially in winter by the impact of cold temperatures, the range decline is more pronounced. Batteries have a long cycle life individually, but the overall cycle life is around 800 times after forming a group. In short, mileage anxiety has not been completely solved, and the charging problem in the city also needs to be solved urgently. At present, when buying an electric car, I personally feel that the first thing to consider is still the charging problem.

To summarize, both range and cycle times are important factors to consider when buying a pure electric vehicle. The range directly affects the range of use, while the number of cycles is related to the service life of the battery. However, consumers should treat these two parameters rationally and be psychologically prepared before purchasing a vehicle. Meanwhile, the charging issue is also one of the factors to focus on. Only when these factors are considered comprehensively can a wise car-buying decision be made.

• new energy vehicle
• cylindrical cell
• battery pack
• by Ellen
• Oct 26,2023
• Topics
• 79

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