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SOC ESTIMATION DEVICE FOR SECONDARY BATTERY

  • US 20170010327A1
  • Filed: 11/28/2014
  • Published: 01/12/2017
  • Est. Priority Date: 02/25/2014
  • Status: Active Application
First Claim
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1. An State of Charge (SOC) estimation device for a secondary battery in which a correlation curve indicating a relationship between an SOC and an Open Circuit Voltage (OCV) differs between a charging process and a discharging process,wherein the SOC estimation device comprises a means for estimating the SOC based on a relational formula in which as actually measured OCV is increased, weights are assigned to the correlation curve indicating the relationship between the SOC and the OCV in the discharging process, and as actually measured OCV is decreased, weights are assigned to the correlation curve indicating the relationship between the SOC and the OCV in the charging process, andwherein in the means for estimating the SOC, an OCV at which a difference Δ

  • Q in a charge amount Q at the same OCV is maximized, in a correlation curve indicating a relationship between the OCV and the charge amount Q in the charging process and the discharging process, is a threshold OCV, and the means estimates the SOC based on a relational formula in which as the actually measured OCV becomes smaller than the threshold OCV, weights are assigned to the correlation curve indicating the relationship between the SOC and the OCV in the charging process, and as the actually measured OCV becomes greater than the threshold OCV, weights are assigned to the correlation curve indicating the relationship between the SOC and the OCV in the discharging process.

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