[특허]Method for maintaining the charge capacity of traction battery modules of a hybrid electric vehicle

Method for maintaining the charge capacity of traction battery modules of a hybrid electric vehicle 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H01M-010/44
출원번호	US-0961573 (1997-10-30)
발명자 / 주소	Hoffman Jr. David William Grewe Timothy Michael
출원인 / 주소	Lockheed Martin Corporation
대리인 / 주소	Meise
인용정보	피인용 횟수 : 44 인용 특허 : 0

초록 ▼

A hybrid electric vehicle includes a lead-acid traction battery made up of a plurality of series-connected modules. During operation of the vehicle, the traction battery is discharged for acceleration, and charged by an ancillary power source. The traction battery is desirably not fully charged at the beginning of a day's operation, so that overcharging cannot occur, so the battery spends long periods of time in a partially charged condition. When not fully charged for long periods of time, sulfation may reduce the charge storage capacity of the battery. A maintenance procedure takes place when the vehicle is not operating, in which one or more modules of the traction battery, but less than all the modules, are fully charged, then partially discharged. The full charging tends to reduce sulfation in the particular module being maintained, and the partial discharge restores its charge condition to that prior to the full charge. Each of the modules is eventually maintained by a programmed controller. The charging energy comes from an auxiliary battery, and the discharge energy is returned to the auxiliary battery, so there is little net loss of energy. If maintenance procedure is interrupted before full charge of a module, that module is scheduled for the next maintenance. If the maintenance is interrupted before partial discharge, the partial discharge is accomplished by equalizing the voltage of the battery modules.

대표청구항 ▼

[ What is claimed is:] [1.] A method for maintaining the modules of a traction battery of a hybrid electric vehicle, which traction battery is made up of a plurality of series-connected modules, which vehicle, when operating, tends to charge said traction battery at a rate which may at times exceed the discharge rate for powering said vehicle so that said traction battery tends to receive a net charge, each of said modules of said traction battery having a nominal voltage when fully charged, and each of said modules of said traction battery having a characteristic which includes degradation when overcharged, and which experiences a reduction of charge capacity when discharged without prompt full recharging, said method comprising the recurrent steps of:while said vehicle is not operating, and under control of a programmed processor, fully charging at least one module of said traction battery, but not charging any of the remaining modules of said traction battery simultaneously with charging of said one module of said traction battery:under said control of said programmed processor, and after said step of fully charging said at least one module, intentionally partially discharging said at least one module, but not said remaining modules, of said battery; andoperating said vehicle for a period of time.

이 특허를 인용한 특허 (44)

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Method for maintaining the charge capacity of traction battery modules of a hybrid electric vehicle 원문보기

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