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Coming back to the topic at hand, I am also in the design phase of a Chevy Volt pack split in 2. And I am considering the following:
  • 2 parallel strings 48S3P
  • each string with contactor
  • string contactors commanded by charger&BMS
    • Charge Cycle - contactors closed, single charger for both strings
    • BMS command - stop charge & open contactors when first cell reaches top charge setting
    • Balancing cycle - both contactors open.
 

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A thread about reconfiguring Volt packs and this one about reconfiguring a Volkswagen e-Golf pack are getting mixed up; blame me for that, as I borrowed swoozle's wiring illustration from the Volt thread for use here.

Although the e-Golf pack has many more modules, and the modules are consistent (unlike the Volt), the rest of the considerations are similar.
 
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