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How are EV batteries wired?

Published in EV Battery Wiring 1 min read

EV batteries are wired using a combination of series and parallel connections to achieve the desired voltage and capacity.

The way EV batteries are wired involves connecting individual cells together in modules, and then connecting the modules to form the complete battery pack. Here’s a breakdown of how it works:

  • Series Connection: According to the reference video, this method is used to increase the voltage range of the batteries. By connecting cells in series, the voltages of individual cells are added together. For example, if you connect ten 3.7V cells in series, you'll get a total voltage of 37V.

  • Parallel Connection: This is used to increase the battery capacity. When cells are connected in parallel, the current capacities are added together while the voltage remains the same. This increases the overall energy storage.

  • Combination of Series and Parallel: Many EV batteries use a combination of both series and parallel connections to optimize battery efficiency. Cells are often connected in series to achieve the desired voltage, and then multiple series strings are connected in parallel to increase the current capacity and overall energy.