Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent
1996-09-05
1997-10-21
Tso, Edward
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
With discharge of cells or batteries
320 30, 320 48, H01M 1044, H01M 1046
Patent
active
056800304
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a condition managing system for managing the condition of a battery pack which is formed by combining a number of storage batteries, such as nickel/hydrogen storage batteries, which may be used as a drive power source for a movable body such as an electric car.
BACKGROUND ART
A sealed nickel/hydrogen storage battery has excellent basic characteristics, such as an energy density, an output characteristic and a cycle life characteristic; and it is under development for a practical use, as a power source for a drive motor or the like for a movable body such as an electric car. In the case of using such a battery to power electric car, the battery must have a battery capacity of about 50 to 150 Ah and a total voltage of about 100 to 350V to supply a predetermined drive output.
Since an output voltage of one cell, i.e., the minimum unit of a sealed nickel/hydrogen storage battery is around 1.2V, a number of cells are connected in series to obtain a desireable total voltage.
If ten such cells are connected in series to form one module battery, and if twenty-four such module batteries are connected in series, a battery pack consisting of two hundred and forty cells is formed so as to produce a total voltage of 288V.
In a movable body such as an electric car which mounts such a battery pack thereon for supplying power to a motor or the like from the battery pack so that the car runs always in a stable condition, the condition of the battery must be managed.
A lead battery is conventionally used in most cases as a power source for a drive motor or the like for a movable body such as an electric car. Condition monitoring of the capability of a battery pack which is formed by lead batteries is realized principally by monitoring a terminal voltage of the battery. For example, a voltage between a plus terminal and a minus terminal of the battery pack as a whole, namely, a total voltage is measured; and the battery pack voltage is controlled and a discharging voltage and a stop voltage are monitored by a constant voltage charging method.
Further, for safe control of the battery, a method of monitoring an absolute temperature of the battery has been proposed.
However, a sealed nickel/hydrogen storage battery which is used as a power source for a drive motor or the like for a movable body such as an electric car has a battery characteristic which is different from that of a conventional battery such as a lead battery; and therefore, with constant voltage control it is difficult to fully utilize the characteristics of the battery.
DISCLOSURE OF THE INVENTION
An object of the present invention is to provide for a condition managing system for a sealed nickel/hydrogen storage battery, with which it is possible to fully utilize the characteristics of a sealed nickel/hydrogen storage battery which has excellent basic characteristics, such as an energy density, an output characteristic and a cycle life characteristic.
In the present invention, a condition managing system for a storage battery used as a drive power source for a movable body comprises:
a battery pack which is formed by combining a number of storage batteries;
a ventilation part for supplying cool air toward said battery pack;
a detection unit which is disposed in the vicinity of said battery pack to detect condition information about a voltage, a temperature and a pressure of a storage battery and an ambient temperature, said detection unit having an analog-digital conversion function of converting an obtained detection value from an analog value into a digital value and a signal sending function of successively sending said digital value in a serial method;
a movable body signal control part for controlling a discharging current of a storage battery, a charging current of the storage battery, a regenerative current to the storage battery which is generated during a breaking operation of the movable body, and various types of information regarding the movable body;
a battery condition judging unit including
REFERENCES:
patent: 4907223 (1990-03-01), Wroblewski
patent: 4968942 (1990-11-01), Palanisamy
patent: 5148043 (1992-09-01), Hirata et al.
patent: 5525890 (1996-06-01), Iwatsu et al.
patent: 5576611 (1996-11-01), Yoshida
Ito Noboru
Kadouchi Eiji
Kinoshita Megumi
Takata Kanji
Watanabe Yuichi
Matsushita Electric - Industrial Co., Ltd.
Tso Edward
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