Technical FAQs 4

Do batteries self-discharge?

Batteries, the power source for devices, have an often overlooked characteristic – self-discharge. Whether it’s the AA batteries in your remote control or the lithium-ion battery pack, all batteries lose their charge over time, even when they’re not in use.

What are the charging and discharging requirements of a battery pack?

The charging and discharging requirements of the battery pack are directly related to the power demand required by the electric motors and the charging time. The battery pack design shall be such that could meet the required max power in traction and regeneration modes. In addition, the charging power is a critical factor for end users.

What are the standards for a battery pack?

There are few standards addressing topics such as ISO7637_1 ; ISO7637_2 ; ISO7637_3 , but as mentioned, more work or regulations are needed. The battery pack, as an individual component with connectors and interfaces, including all cells and electronics, has an acceptable EMC behavior, as defined in relevant standards.

What happens if a battery has a different self-discharge rate?

Varying self-discharge rates between cells in a battery pack can result in voltage imbalances between the cells and a shorter battery pack life (Zheng et al., 2020). Self-discharge rates vary depending on the cell chemistry, capacity, electrode geometry, electrolyte formulation, impurities, and temperature.

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Battery pack self-discharge standard

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