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Control system for sodium-sulfur battery
| Details |
Inventors: Tamakoshi, Tomio;
Assignee: NGK Insulators, Ltd. (Nagoya, JP); The Tokyo Electric Power Co., Inc. (Chiyoda-ku, JP)
Primary Examiner: Ryan; Patrick Joseph
Assistant Examiner: Parsons; Thomas H.
Attorney, Agent or Firm: Burr & Brown
A control system for a sodium-sulfur battery, which is composed of a plurality of battery modules connected in series, includes a control device having at least a temperature measuring unit for measuring a temperature of each battery module, a voltage measuring unit for measuring a voltage thereof, and a current measuring unit for measuring a current thereof assembled as a single control device. Preferably, the system includes a unit for detecting the end of discharge and the end of charge. Thus, the time lag in the detection of the end of discharge and the end of charge may be prevented. The reliability of a NaS battery during long-term operation is improved. A fluctuation in the power consumption of heaters during the driving of the NaS battery is reduced. The space required for installing power equipment such as a transformer may be omitted. |
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DETAILED DESCRIPTION The present invention is made in consideration of the above-mentioned problems.
It is an object of the present invention to prevent misdetection of the end of charge and the end of discharge to increase the long-term reliability of a NaS battery.
It is another object of the present invention to reduce fluctuations in the power consumption of heaters during the operation of a NaS battery in order to eliminate voltage fluctuations, and to omit power receiving equipment, such as a transformers, to reduce the cost of the control system.
To solve the problems, investigations have been repeatedly performed and studies have made progress.
As a result, it has been found that the above objects can be accomplished by employing a system in which all elements for controlling temperatures, voltages, and currents of a predetermined number of battery modules are assembled as a single control device.
In addition, a reduction in the cost of initial equipment of a NaS battery, serving as, for example, a power storage system, and a reduction in time required for the design and manufacture thereof, are expected benefits of using the system of the present invention.
According to the present invention, there is provided a control system for a sodium-sulfur battery having a plurality of battery modules connected in series or in parallel to each other, wherein there is provided a control device housing at least a temperature measuring unit for measuring a temperature of a predetermined number of battery modules, a voltage measuring unit for measuring a voltage thereof, and a current measuring unit for measuring a current thereof, as a single united system.
Preferably, the system includes a unit for detecting the end of discharge and the end of charge.
When the control system is used in a sodium-battery in which each battery module has a heater, a three-phase, three-wire power supply is used to supply power to the heaters, and the respective heaters are connected so that each heater serves as a line load between lines, it is preferable that the control system is provided with a heater control unit capable of controlling the respective heaters so as to level the power consumption of the respective lines per unit time
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