Cell Balancing
The design board supports external cell balancing with 16 N-channel MOSFETs. The peak balancing current is
117 mA with 4-V cell voltage, 99 mA flows through external balancing resister and MOSFET, 18 mA flows
through the BQ76952 device. This design only balances non-adjacent cells in use. The conditions that will
trigger cell balancing are: minimum cell voltage is larger than 3500 mV, maximum cell voltage gap is larger than
40 mV, and cell temperature is between –20°C to 60°C. The external cell balancing performance is shown as
Figure 3-10. Cell balancing duty is about 85%.
Figure 3-10. External Cell Balancing
Hardware, Software, Testing Requirements, and Test Results www.ti.com
14 10s–16s Battery Pack Reference Design With Accurate Cell Measurement and
High-Side MOSFET Control
TIDUEY5 – JANUARY 2021
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