Questions

Does a passive BMS overly drain a lithium-ion battery when left idle?

Yes, when idle, the Passive BMS can drain the lithium-ion battery.

  1. A passive BMS is powered by a battery, and a good BMS draws on the order of 1 to 10 μA from the battery cell.
  2. A poorly designed BMS may draw 1-10 mA, which is sure to overdischarge the lithium-ion battery in a relatively short period of time.

Furthermore, recovering the battery becomes challenging if its voltage drops below 2.5 volts. If the battery is fine, a new BMS can help.

MORE: Will BMS shut down when BMS SOC is high?

Jessica Liu

Jessica Liu, an engineer at MOKOEnergy with 6 years of work experience, majored in automation at Hubei University of Technology. She has been involved in leading and monitoring comprehensive projects when worked for a top new energy company before. She is certified in PMP, IPD, IATF16949, and ACP. She excels in IoT devices, new energy MCU, VCU, solar inverter, and BMS.

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