DIAGNOSIS DEVICE AND DIAGNOSIS METHOD FOR SECONDARY BATTERY, AND VEHICLE

Title:

DIAGNOSIS DEVICE AND DIAGNOSIS METHOD FOR SECONDARY BATTERY, AND VEHICLE

Document Type and Number:

WIPO Patent Application WO/2011/145213

Kind Code:

A1

Abstract:

A diagnosis device diagnoses the state of degradation caused by metallic lithium deposition in a lithium ion secondary battery (hereinafter referred to as "battery") configured by connecting a plurality of battery blocks in series. When a diagnosis start condition is satisfied, the diagnosis device starts the discharge of the battery and calculates, for each of the battery blocks, a block discharge quantity (Q) discharged from the battery from when the voltage (Vb) of each battery block drops to a measurement start voltage (Vs) until dropping to a measurement end voltage (Ve). The diagnosis device determines that the battery is in "a brand-new state" when every block discharge quantity (Q) is larger than a brand-new state determination threshold (A1), determines that the battery is "usable" when every block discharge quantity (Q) is larger than a nonuse determination threshold (A2), and determines that the battery is "unusable" when at least any one block discharge quantity (Q) is below the nonuse determination threshold (A2).

Inventors:

MANO RYO (JP)
ISHISHITA TERUO (JP)
MATSUMOTO JUNICHI (JP)
TEZUKA TAKAYOSHI (JP)

Application Number:

PCT/JP2010/058640

Publication Date:

November 24, 2011

Filing Date:

May 21, 2010

Export Citation:

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Assignee:

TOYOTA MOTOR CO LTD (JP)
MANO RYO (JP)
ISHISHITA TERUO (JP)
MATSUMOTO JUNICHI (JP)
TEZUKA TAKAYOSHI (JP)

International Classes:

G01R31/36

Domestic Patent References:

WO2010001605A1

2010-01-07

Foreign References:

JP2000224701A	2000-08-11
JP2001057246A	2001-02-27

Other References: