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SECONDARY BATTERY SYSTEM

  • US 20120169288A1
  • Filed: 09/25/2009
  • Published: 07/05/2012
  • Est. Priority Date: 09/25/2009
  • Status: Active Grant
First Claim
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1. A secondary battery system comprising a secondary battery, whereinthe secondary battery includes a positive active material formed of lithium manganate having a spinel crystal structure and a negative active material associated with change in phase due to charging and discharging,the secondary battery system includes dQ/dV calculation means for calculating, during charging and discharging of the secondary battery, a value for dQ/dV representative of a ratio of dQ to dV where dQ is a variation in storage amount Q of the secondary battery and dV is a variation in battery voltage V of the secondary battery, anda state of the secondary battery system is detected based on a peak appearing on a V−

  • dQ/dV curve representative of a relationship between the battery voltage V value and the dQ/dV value.

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