What factors affect EV battery life? | Drive Safe and Fast

TechTalk

Published on January 6th, 2019 | by Daniel Sherman Fernandez

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What factors affect EV battery life?

To understand what impacts a battery’s life, it’s important to first understand how it works. Electric Vehicle (EV) batteries are lithium based, so when they are charged and discharged once, it’s called a cycle. A battery’s capacity will degrade as the cycle number increases and battery life is measured in those cycles, with the industry standard of cycles close to 80% considered a benchmark.

So what shortens the life of a lithium battery? A number of factors:

  • High temperatures
  • Overcharging or high voltage
  • Deep discharges or low voltage
  • High discharges or charge current
  • When a lithium battery is charged, the voltage slowly rises. When it reaches full charge, voltage is at its highest and will not go up any more. There’s a need to keep voltage from getting excessive, which is why batteries come with a battery management system (BMS). These control the charging voltage so maximum charging voltage and temperature is never exceeded.


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