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How many BMS should be installed for two lithium-ion battery packs connected in series?

If I have two separate lithium-ion battery packs in series, should I install a BMS for each pack or just one?

Battery Management System
September 28, 2023

Designing one BMS for each lithium-ion battery pack is necessary.
If the batteries become unbalanced over time, one has more charge than the other, and the charger will overcharge the battery at the end of charging, which is prone to accidents. The right BMS would not be too expensive. Depending on your situation, two cells are connected in series to form a battery pack, which we will call a 2S1P battery pack, and you can buy a BMS with the 2S1P tag.

MORE: Is it possible to connect two lithium-ion batteries in parallel with a separate BMS?

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.

Jessica Liu

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