Title:
BATTERY CONTROL DEVICE AND BATTERY SYSTEM
Document Type and Number:
WIPO Patent Application WO/2017/056732
Kind Code:
A1
Abstract:
Conventionally, it is not possible to estimate a state of charge (SOC) with high accuracy. In the present invention, immediately prior to a second discharge, as indicated by time t5, an SOC initial value which includes post-charging residual polarization voltage is acquired and thereupon SOCi2(t) is calculated, and as shown in graph S2, calculation result SOCi2(t) is obtained from time t5. As a result, because a charge-discharge pair is realized, combination calculation according to an embodiment of the present invention becomes possible. Based on the SOC initial value which includes post-charging residual polarization voltage, an SOCi calculation value (SOCi2(t)) and SOCi1(t) are calculated in parallel, and by using a weighting factor calculated on the basis of a formula 5, two SOC are weight averaged to find SOCc(t). As a result, as shown in graph S3, calculation result SOCc(t) is obtained from time t5.
Inventors:
NAKAO RYOHHEI (JP)
OHKAWA KEIICHIRO (JP)
OHKAWA KEIICHIRO (JP)
Application Number:
PCT/JP2016/073216
Publication Date:
April 06, 2017
Filing Date:
August 08, 2016
Export Citation:
Assignee:
HITACHI AUTOMOTIVE SYSTEMS LTD (JP)
International Classes:
H02J7/00; G01R31/36; H01M10/48; B60L3/00
Domestic Patent References:
| WO2014119328A1 | 2014-08-07 | |||
| WO2015129117A1 | 2015-09-03 |
Foreign References:
| JP2015158412A | 2015-09-03 | |||
| JP2013164373A | 2013-08-22 |
Attorney, Agent or Firm:
TODA Yuji (JP)
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