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Battery control system and vehicle

a battery control system and battery technology, applied in the direction of electrical propulsion mounting, electrical apparatus construction details, transportation and packaging, etc., can solve the problem of secondary battery degradation detection, and achieve the effect of improving accuracy

Active Publication Date: 2013-01-29
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0020]The battery control system as described above includes the above-mentioned state-of-charge detecting unit and degradation detection executing unit. With this arrangement, the system detects the degree of degradation of the secondary battery when the battery is in a specified state of charge (for example, SOC=50%), so that changes in the degree of degradation with time can be grasped with high accuracy, and degradation of the secondary battery can be accurately detected.
[0023]As described above, if the secondary battery is in different states of charge (for, example, SOC 50% and SOC 90%), the indicator, such as battery resistance, indicative of the degree of degradation is likely to be different values. In view of this, the battery control system as described above detects degradation of the secondary battery when the battery is in a plurality of specified states of charge. Thus, the system can determine the degree of degradation with further improved accuracy, from the conditions of degradation in the plurality of specified states of charge.

Problems solved by technology

Therefore, degradation of the secondary battery is detected, using stable charging current obtained by the external charging unit using the external power supply, rather than charging current with which the secondary battery is charged using the engine or the motor.

Method used

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Comparison scheme
Effect test

first embodiment

[0079]As shown in FIG. 10, the charge interruption type degradation detection subroutine S120 includes a first charge interruption subroutine S130, a second charge interruption subroutine S140, and a third charge interruption subroutine S150. In the first charge interruption subroutine S130, the external charging current value ECX is changed to a specified charging current value C1 at which the batteries 21B are externally charged, and the external charging is then stopped over a predetermined interruption period JT. In the second charge interruption subroutine S140, the external charging current value ECX is changed to a specified charging current value C2 at which the batteries 21B are externally charged, and the external charging is then stopped over the predetermined interruption period JT. In the third charge interruption subroutine S150, the external charging current value ECX is changed to a specified charging current value C3 at which the batteries 21B are externally charged...

second embodiment

[0093]As is understood from the above description, the control device 110 of the vehicle 101 according to the invention has the charge interruption type degradation detection subroutine S120 including the first charge interruption subroutine S130, second charge interruption subroutine S140 and the third charge interruption subroutine S150. Therefore, changes from the load voltage VL to the momentarily reduced voltage VM, and changes from the momentarily reduced voltage VM to the final voltage VN can be detected from changes in the terminal voltage VA of the batteries 21B in a no-load condition during the interruption period JT. Then, the battery resistances RBX, etc. of the batteries 21B due to electrochemical reactions within the batteries 21B are obtained, using the changes from the momentarily reduced voltage VM to the final voltage VN due to battery characteristics of the batteries 21B. Furthermore, the degree of degradation of the batteries 21B represented by the first-state re...

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PUM

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Abstract

A battery control system controls an external charging unit in a vehicle including a vehicle body, engine, motors, secondary battery, and the external charging unit, and includes a degradation detecting unit that detects degradation of the secondary battery, during charging of the second battery by the external charging unit.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a national phase application of International Application No. PCT / IB2010 / 001607, filed Jun. 30, 2010, and claims the priority of Japanese Application No. 2009-157195, filed Jul. 1, 2009, the contents of both of which are incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The invention relates to a battery control system including an engine, a secondary battery used as a driving power source, and an external charging unit that charges the secondary battery using an external power supply, and also relates to a vehicle including the battery control system.[0004]2. Description of the Related Art[0005]In recent years, an externally chargeable electric vehicle, such as a so-called plug-in electric vehicle, on which a secondary battery that can be charged with an external power supply is installed as a driving power source, and a so-called hybrid electric vehicle on which an engin...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H02J7/14H02J7/00B60K1/00
Inventor ARAI, TAKUICHIHARA, TOMITAROTSUJIKO, AKIRASHINDO, YOHEIABE, TAKESHITERAMOTO, DAISUKEWASADA, KEIKOYUASA, SACHIE
Owner TOYOTA JIDOSHA KK