SLUUCV6 June   2024 BQ2969

 

  1.   1
  2.   Description
  3.   Get Started
  4.   Features
  5.   Applications
  6.   6
  7. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
      1. 1.2.1 Required Equipment
    3. 1.3 Specification
    4. 1.4 Device Information
  8. 2Hardware
    1. 2.1 Setup
    2. 2.2 BQ2969 Circuit Module Use
      1. 2.2.1 Cell Simulator
      2. 2.2.2 Reducing the Cell Count
      3. 2.2.3 Connecting Cells
    3. 2.3 Best Practices
  9. 3Hardware Design Files
    1. 3.1 BQ2969EVM Circuit Module Physical Construction
      1. 3.1.1 Schematics
      2. 3.1.2 Board Layout
      3. 3.1.3 Bill of Materials
  10. 4Additional Information
    1. 4.1 Trademarks
  11. 5Related Documents from Texas Instruments

2.2.3 Connecting Cells

The EVM is constructed with a single connection to the top and bottom of the cell stack. Cell voltage for these cells is sensed on the board. The board is not configured to control current into or out of the cells.

The cell simulator provides resistors between the cell inputs. While in the process of installing physical cells, the cell simulator resistors load the cells and divide the voltage between any other unconnected inputs. The shunts must be removed once all the cells are connected or the cells are discharged by the constant drain of the cell simulator resistors.

BAT- is the reference voltage for the IC and must be connected first. After BAT-, cells can be connected in any order. Cell connection from the bottom up minimizes the voltage step size applied to the board. The recommended connection sequence for the EVM when connecting cells is bottom up:

  1. Connect BAT–.
  2. Connect cells bottom up: CELL1, CELL2, CELL3.
  3. Make sure the cell simulator shunts are removed.