Part Number:BQ76930
您好,
我們在運用BQ76930於8顆電芯電壓量測已經有2-3年了,目前使用數量約有10k pcs左右,此問題困擾我們很久,已被客戶關注這問題,因此向TI E2E提出,
遇到情況是在:
BMS系統在靜態下,單cell不定時跳動,約略為+/-96mV,而我們取樣時間為7秒收1次資料,
如下圖所示:
可看到圖中紅色箭頭指出,t_CellVoltage08在19:18:49發生一次電壓變化-97mV,
後端每7秒收一次資料,對照到上圖發生異常時的前後筆資料(3430mV->3333mV->3430mV)
而發生這異常現象時,相關的 Raw Data。(3428mV->3333mV->3430mV)
Sampling Rate 1 秒經由 I2C 跟 BQ76930 要一次的資料
(CellArrayVoltageRead)cellV RawData = 0-[2306]/1-[2301]/2-[230D]/3-[0]/4-[22F5]/5-[225C]/6-[231F]/7-[230F]/8-[22]/9-[22EF]/10-[0]/11-[0]/12-[0]/13-[0]/14-[0]/15-[45E9]/
(CellArrayVoltageRead)Really cellV Voltage = 0-[3432]/1-[3430]/2-[3434]/3-[0]/4-[3425]/5-[3367]/6-[3441]/7-[3435]/8-[55]/9-[3423]/10-[0]/11-[0]/12-[0]/13-[0]/14-[0]/15-[6808]/
(CellArrayVoltageRead)cellV RawData = 0-[2306]/1-[2301]/2-[230D]/3-[0]/4-[22F5]/5-[2265]/6-[2323]/7-[230D]/8-[21]/9-[2301]/10-[0]/11-[0]/12-[0]/13-[0]/14-[0]/15-[45F0]/
(CellArrayVoltageRead)Really cellV Voltage = 0-[3432]/1-[3430]/2-[3434]/3-[0]/4-[3425]/5-[3371]/6-[3443]/7-[3434]/8-[55]/9-[3430]/10-[0]/11-[0]/12-[0]/13-[0]/14-[0]/15-[6810]/
(CellArrayVoltageRead)cellV RawData = 0-[2306]/1-[2301]/2-[230D]/3-[0]/4-[22FA]/5-[2270]/6-[2324]/7-[230D]/8-[23]/9-[2301]/10-[0]/11-[0]/12-[0]/13-[0]/14-[0]/15-[45F4]/
(CellArrayVoltageRead)Really cellV Voltage = 0-[3432]/1-[3430]/2-[3434]/3-[0]/4-[3427]/5-[3375]/6-[3443]/7-[3434]/8-[56]/9-[3430]/10-[0]/11-[0]/12-[0]/13-[0]/14-[0]/15-[6812]/
(CellArrayVoltageRead)cellV RawData = 0-[2306]/1-[2301]/2-[230D]/3-[6]/4-[22F8]/5-[2267]/6-[2320]/7-[230E]/8-[25]/9-[22FD]/10-[0]/11-[0]/12-[0]/13-[0]/14-[0]/15-[45F0]/
(CellArrayVoltageRead)Really cellV Voltage = 0-[3432]/1-[3430]/2-[3434]/3-[45]/4-[3426]/5-[3372]/6-[3441]/7-[3435]/8-[56]/9-[3428]/10-[0]/11-[0]/12-[0]/13-[0]/14-[0]/15-[6810]/
(CellArrayVoltageRead)cellV RawData = 0-[2307]/1-[2301]/2-[230C]/3-[4]/4-[22F3]/5-[2270]/6-[231F]/7-[230B]/8-[23]/9-[2201]/10-[0]/11-[0]/12-[0]/13-[0]/14-[0]/15-[45F2]/
(CellArrayVoltageRead)Really cellV Voltage = 0-[3432]/1-[3430]/2-[3434]/3-[44]/4-[3424]/5-[3375]/6-[3441]/7-[3434]/8-[56]/9-[3333]/10-[0]/11-[0]/12-[0]/13-[0]/14-[0]/15-[6811]/
(CellArrayVoltageRead)cellV RawData = 0-[2306]/1-[2302]/2-[230D]/3-[4]/4-[22F4]/5-[225B]/6-[231E]/7-[230E]/8-[26]/9-[2301]/10-[0]/11-[0]/12-[0]/13-[0]/14-[0]/15-[45EE]/
(CellArrayVoltageRead)Really cellV Voltage = 0-[3432]/1-[3430]/2-[3434]/3-[44]/4-[3425]/5-[3367]/6-[3441]/7-[3435]/8-[57]/9-[3430]/10-[0]/11-[0]/12-[0]/13-[0]/14-[0]/15-[6809]/
(CellArrayVoltageRead)cellV RawData = 0-[2306]/1-[2301]/2-[230D]/3-[0]/4-[22F3]/5-[2269]/6-[2320]/7-[230E]/8-[24]/9-[2302]/10-[0]/11-[0]/12-[0]/13-[0]/14-[0]/15-[45F1]/
(CellArrayVoltageRead)Really cellV Voltage = 0-[3432]/1-[3430]/2-[3434]/3-[0]/4-[3424]/5-[3372]/6-[3441]/7-[3435]/8-[56]/9-[3430]/10-[0]/11-[0]/12-[0]/13-[0]/14-[0]/15-[6811]/
再麻煩協助分析,
謝謝。
Cherry Zhou:
您好,您的问题在E2E英文论坛已有工程师跟进,请继续关注:(由于时差等问题,英文论坛工程师可能会于稍晚些给您答复)
https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1066145/bq76930-bq76930-for-8-series-cells-voltage-measurement-problem
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