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TI BQ76930的AFE 7个Cell connection问题

Matt Tsai
Intellectual 410 points
Other Parts Discussed in Thread: BQ76930

我是用TI BQ76930的AFE
如果是10个cell的设定, 相邻的cell 不能同时做Cell Balance
如CELL3和CELL4不能同时做Cell Balance

Cell Connections for bq76930 (10 cells)
CELL 1
CELL 2
CELL 3
CELL 4
CELL 5
CELL 6
CELL 7
CELL 8
CELL 9
CELL 10

但如果是7个cell 的connection, CELL3和CELL4之间有一个short
请问一下这时候的CELL3和CELL4算是相邻吗? 我可以对CELL3, CELL4做cell balance吗?

Cell Connections for bq76930 (7 Cells)
CELL 1
CELL 2
CELL 3
short
CELL 4
CELL 5
CELL 6
short
short
CELL 7


Thanks

  • 0
    TI__Prodigy 200 points

    Matt，

    算是相邻，还是不建议同时做CB。不建议相邻CELL同时CB，主要是从器件引脚绝对耐压和差分耐压考虑。可以参考下面文档的9.5章节

    www.ti.com/.../sluub41.pdf

  • 0 回复 Hollis Liu
    Intellectual 410 points

    If cells 4 and 5 are balanced, the VC3 input pulls to VC4, which is approximately the cell 4 voltage or 16 V.
    ==>请问一下这时候VC3，VC4，VC5的电压值各为何？ VC3，VC4，VC5这时是等电压吗？

    However, if cell 1 and cell 2 are balanced, VC0 pulls to the cell 1 value of 4 V. Because this is above the absolute maximum of 3.6 V
    ==>是指VSS-VC0不能超过3.6V，如果每个cell是4V的情况下，是不是只要cell1做电池平衡时，VSS-VC0就会超过3.6V？


    Datasheet中的6.1 Absolute Maximum Ratings及6.3 Recommended Operating Conditions
    提到的电压值有什么不同，关于VSS-VC0，一个是3.6V，一个是写10V
    VSS-VC0的绝对最大额定值是3.6V
    (VC0–VSS): 10V

    这部分不是很了解
    不知道是否可以帮忙解惑一下


    Thanks