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P3 Analysis: E-car batteries last much longer than expected

Batteries of electric cars are much more durable than previously thought. This is shown by an analysis of more than 7,000 vehicles conducted by the consulting agency P3 with Avillo. They are still in good condition even beyond 300,000 km.

Like Duracell: Electric car batteries last significantly longer than previously assumed, according to a new study by P3. | Photo: Stellantis
Like Duracell: Electric car batteries last significantly longer than previously assumed, according to a new study by P3. | Photo: Stellantis
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The Stuttgart-based technology consulting firm P3 has analyzed more than 7,000 electric cars to assess the durability of their batteries. The results show that the e-car batteries last significantly longer than expected. They simply don’t break down, reports the specialist magazine Auto/Motor/Sport. Even the range hardly diminishes after high mileage. The health status of a battery is expressed in the State of Health (SoH), which indicates what percentage of its full capacity a battery is still usable. The SoH can decrease due to aging and many charging cycles. Manufacturers usually offer a warranty of 160,000 km or eight years with at least 80 percent. In some cases, there are already warranties up to 250,000 kilometers and ten years.

These are realistic or somewhat understated values, the study shows: Even with 200,000 or 300,000 kilometers, electric cars still have an average of 87 percent SoH. However, because there are hardly any electric cars with such high mileage, the study's results become somewhat less accurate in this area, according to ams. For the study, the company initially examined its own fleet of 50 vehicles.

Aviloo evaluates its own data

Subsequently, the Austrian start-up Aviloo joined the study, which has already conducted tens of thousands of battery capacity tests with its self-developed measurement technology, including vehicles with 200,000 or even 300,000 kilometers and over 90 percent SoH. It was noted that batteries do not lose capacity linearly with age. A chemical process occurs in the first 30,000 kilometers, causing the SoH to drop to about 95 percent. After that, the aging process of the battery slows down significantly, the study outlines.

As is well known, the specific use of one's electric car has a significant impact on the aging of the battery. Stress affects the battery, for example, through power demand at too high or too low temperatures, constantly high charging capacities, too frequent full or complete discharges, and long idle periods with 100 percent SoC.

A distinction is made between calendar aging and cyclical aging. Calendar aging is essentially subject to individual influence. Cyclical aging occurs during use, that is, during discharge or charging. In general, either very strong acceleration or strong charging causes more stress, each intensified by extreme temperatures. With increasing acceptance and growing understanding, more and more batteries are likely to remain in the best health even after hundreds of thousands of kilometers in the future, according to the trade medium.

Translated automatically from German.
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