SLUAAT6B July   2024  – June 2026 BQ41Z50

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Manufacture Testing
  5. 2Calibration
    1. 2.1 Cell Voltage Calibration
    2. 2.2 Per-Cell Auto-Calibration
      1. 2.2.1 Command Overview
      2. 2.2.2 Message Structure
        1. 2.2.2.1 Data Payload Format
        2. 2.2.2.2 Per-Cell Voltage Format
      3. 2.2.3 SMBus Block Protocol
        1. 2.2.3.1 Command Format
      4. 2.2.4 Procedure
    3. 2.3 BAT Voltage Calibration
    4. 2.4 PACK Voltage Calibration
    5. 2.5 Current Calibration
      1. 2.5.1 CC Offset Calibration
      2. 2.5.2 Board Offset Calibration
      3. 2.5.3 CC Gain Calibration
    6. 2.6 Temperature Calibration
      1. 2.6.1 Internal Temperature Sensor Calibration
      2. 2.6.2 TS1–TS2–TS3–TS4 Calibration
  6. 3Summary
  7. 4References
  8. 5Revision History

2.2 Per-Cell Auto-Calibration

Per-cell auto-calibration is a dynamic calibration process that computes individual gain factors for each of the battery cells independently. Instead of using a global cell gain calibration, it measures and stores a unique calibration value for each cell in the pack.

In the following section, we will use the bq41z90 (16 cell device) as example. For other device families, based on the number of supported cells, you need to make corresponding adjustments for message format.