About the Cycle Life of New Energy Vehicle Power Battery

When it comes to electric cars, consumers who don't know much about them question how they, like mobile phones, can keep using them for years without changing their batteries. In fact, this is not the case, not to mention whether mobile phones and electric vehicles are comparable or not, just from the power cell characteristics and manufacturers of warranty policy, your concern is completely unnecessary. The content of this period from the above two key points, in-depth analysis of the life span of electric vehicles? Here you can reveal in advance, a new energy vehicle, use ten years is not a problem at all.

Before we get to the point, let's look at the types of batteries currently in use in the new energy car market. In today's new energy car market, there are roughly two types of battery packs for electric vehicles: lithium ternary batteries and lithium iron phosphate batteries. Among them, lithium iron phosphate batteries have the advantages of high temperature resistance, strong safety and stability, affordable prices, and better recycling performance; The three-way lithium battery voltage platform is very high. Under the same volume or weight, the three-way lithium battery has more energy than power. In addition, in terms of high rate charging and low temperature resistance, ternary lithium batteries have great advantages.

In the past few years, most of the batteries used by BYD new energy have been lithium-iron phosphate batteries, and thanks to the latest subsidy in 2018, the idea changed earlier this year, with the whole range of cars gradually transitioning to triple-lithium batteries. Lithium ternary cells are now well developed in battery characteristics, and the life span of the battery itself is far beyond our imagination.

Government regulations: Power batteries and other key parts of the warranty should not be less than 8 years or 120,000 kilometers

In addition to its own aspects, look at the government and new energy car manufacturers to provide quality assurance services content. In the "Administrative Rules for the Record of Production Enterprises and Products of Demonstration and Application of New Energy Minibuses in Beijing(Revised in 2015)" promulgated by the Beijing Economic and Social Affairs Commission in 2015, the article was adjusted to provide quality insurance services for vehicles of not less than 3 years or 120,000 kilometers. To provide quality assurance services for key parts such as power cells, motors, and vehicle controllers for no less than 8 years or 120,000 kilometers, the quality assurance regulations have been implemented so far.

Some car and enterprise core lifetime quality assurance, decay 20 change new services

In addition to the government's mandatory warranty period, in order to increase product competitiveness and completely eliminate owners 'doubts, many new energy car companies have their own "characteristic" service policies. Among them, BYD proposed a lifetime quality insurance service for the electric core, and other new energy car companies also promised 8,120,000(or 150,000) kilometers of quality insurance services.

In addition to the warranty period, manufacturers have also given a limit of 20 <UNK> in terms of battery decay. If the decay exceeds this value during the warranty period, there is a corresponding replacement service. As we all know, battery decay is directly related to the daily car experience of the owner. Next, we talk about the problem of decay.

Correct view of battery decay period and timely monitoring of decay impairment

Inevitably, there are signs of decay in batteries in use in electric vehicles, so it is particularly important to view the attenuation value correctly. For example, the first year of decline of electric vehicles is relatively large, usually around 8 <UNK>; In the following 2-3 years, it will decay by 4 %; The decay during the 5-6 years of continuous use gradually slows down, usually only 1 <UNK>. In the first few years of electric vehicle use, this process must be handled correctly without undue concern. It should be noted that once the battery is found to have significant decay, it can immediately confirm whether it is in the warranty period and whether the measurement of decline impairment is within normal range. If the decay exceeds 20 % within the warranty, you can apply to the manufacturer for free replacement of the battery. If it does not exceed 20 % during the warranty period, it is normal.

In addition to the problem of decay, many consumers also have this misconception in their consciousness: The cell decays too fast and must be replaced with a whole battery pack to be renewed. In fact, the core is not equivalent to a power battery. The battery includes a core, a connecting plate, and a circuit board. The electric group is composed of multiple battery monomers. If there is a problem, the manufacturer will detect the problem monomer battery and return to the high-performance state of the battery.

The cycle life of a power cell is nearly 20 years.

So much for the power cell, and we're going to figure out how long a power cell's cycle life really is. Before we calculate, we need to count the data values that are generally available for new energy vehicles today. In the case of an electric car that runs 300 kilometers, it is assumed that the owner will charge twice a week when it is full, and a total of 104 times a year. According to the new energy car company, the power battery life of electric vehicles can reach 2,000 times, so it can be concluded that a power cell's cycle life can be as long as 20 years.

Recently, Beiqi New Energy released the EU 300 model for home power conversion, and also tested the power battery cycle life: The power battery of a pure electric car has a life of 2,000 charge and discharge calculations. In the existing slow charging + fast charging alternating mode, the average user drives 100,000 kilometers, only 500 discharges and discharges are performed at most, and the remaining 1,500 recharges and recharges are wasted.

Summary of the full text: China's automotive industry has developed rapidly at this stage, even if it is fuel vehicles, consumers may not necessarily use more than 10 years. The same applies to electric vehicles. There are also problems with normal use of motor vehicles. In addition, the cycle life of power batteries far exceeds the service life. As a consumer, you should not worry too much. The same applies to second-hand electric vehicles, so throughout their life cycle, replacing batteries is not as bad as you might think.

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