JPH09329652A - Battery discharge available time predictive operation equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain shortening of the life, by simulating a discharge characteristics curve after using an inputted battery voltage as a discharge start voltage, operating the time until the battery voltage reaches an allowable lowest voltage, and automatically removing a battery when a detected voltage of a voltage detector reaches an operated discharge end voltage. SOLUTION: Constants of a battery are inputted in a discharge characteristics recoarding equipment 4, and a discharge characteristics curve corresponding to the inputted constants is extracted. When an input power source of a charger 12 is lost, an operation signal of a power source loss detector 16 is inputted in an operation start command equipment 5, and the most approximate battery discharge characteristics curve is extracted from inputted data in a discharge characteristics comparing equipment 6. A discharge time operating equipment 7 simulates a future discharge characteristics curve by using an inputted battery voltage as a discharge start voltage, and operates the time until the battery voltage reaches the allowable lowest voltage. When a detected voltage by a voltage detector 13 reaches an operated discharge stop voltage, a switch 17 is removed by a battery circuit detaching command equipment 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply facility equipped with a storage battery that is repeatedly charged / discharged.

[0002]

2. Description of the Related Art According to Japanese Patent Application Laid-Open No. 7-260905, the relationship between the storage battery voltage and the storage battery remaining amount is input to a microcomputer for each temperature and mode, and the voltage of the storage battery at the start of discharge and during standby operation of a load. An apparatus has been proposed that calculates the remaining battery level from the memory of the microcomputer by measuring

[0003]

[Patent Document 1] Japanese Unexamined Patent Publication No. 7-260905 discloses that only the remaining amount of the storage battery can be displayed. However, how far the storage battery can be discharged to the load is directly related. It's not understood.

[0004]

The present invention focuses on the fact that the discharge characteristics of a storage battery differ depending on the type / capacity / temperature and the ratio of the discharge current to the capacity. After inputting in advance, extract the discharge characteristic curve that most approximates the storage battery operating state from the input data, simulate the subsequent discharge characteristic curve using the input storage battery voltage as the discharge start voltage, and allow the voltage within the specified discharge time. When it is assumed that the voltage will be within the minimum voltage, an alarm is displayed and a message for operation corresponding to operation such as load selection cutoff is also displayed. Also, different discharge end voltage is calculated depending on the ratio of the discharge current to the capacity, and an alarm is displayed before a certain period of time to reach the discharge end voltage obtained from the simulated discharge characteristic curve, and the storage battery is reached when the discharge end voltage is reached. It is designed to automatically trip the circuit.

[0005]

DETAILED DESCRIPTION OF THE INVENTION An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 shows the configuration of a power supply facility and a storage battery dischargeable time prediction calculation device.

The voltage, current, and temperature detected by the voltage detector 13, the current detector 14, and the temperature detector 15 housed in the DC power supply device 10 are the data input conversion device 3 of the storage battery dischargeable time prediction calculation device 1. Entered in. The storage battery constant is input from the operation terminal 2 to the discharge characteristic recording device 4,
Extract the discharge characteristic curve that matches the input constant. Here, when the input power of the charger 12 is lost, the operation signal of the power loss detector 16 is input to the operation start command device 5, and the storage battery operating state is determined from the various data input to the discharge characteristic comparison device 6 according to the command. The most similar storage battery discharge characteristic curve is extracted. This discharge characteristic curve is the discharge time calculation device 7
The input battery voltage is used as the discharge start voltage to simulate the subsequent discharge characteristic curve, the time until the battery voltage reaches the allowable minimum voltage is calculated, and the result is input to the screen display processing device 8 for discharge. The characteristic curve, alarm, and driving guidance are displayed on the operation terminal 2. In addition, the voltage detector 13
The switch 17 is tripped by the output signal of the storage battery circuit trip command device 9 at the time when the voltage detected by the above reaches the calculated discharge end voltage.

FIG. 2 shows a storage battery dischargeable time prediction calculation device 1.
The operation | movement flowchart in is shown.

FIG. 3 shows an example of a storage battery discharge characteristic curve which is input to the discharge characteristic recording device in advance.

As shown in the figure, since the discharge characteristic of the storage battery varies depending on the ratio CA of the discharge current to the storage battery capacity and the temperature, the discharge characteristic curve is input in a constant step (for example, 0.1 CA, step by 1 ° C.). . Since this discharge characteristic curve differs depending on the storage battery type, the discharge characteristic curve for the assumed type is input.

FIG. 4 shows an example of obtaining the allowable minimum voltage and the time required to reach the discharge end voltage, using the extracted battery discharge characteristic curve.

As shown in the figure, the time 19 from the intersection of the storage battery discharge characteristic curve 18 that most approximates the storage battery operating state and the minimum allowable voltage to the minimum allowable voltage is calculated, and the magnitude of the specified discharge time is calculated. Alarm by comparing,
Determines whether driving guidance is required to be displayed. Since the discharge end voltage varies depending on the ratio CA of the discharge current to the storage battery capacity, this ratio CA is calculated by the input current / capacity, and the time 20 from the intersection with the discharge end voltage to the discharge end voltage is calculated. To do.

[0013]

EFFECTS OF THE INVENTION According to the present invention, even if the voltage drops to the minimum allowable voltage within the specified discharge time of the storage battery, an alarm can be issued in advance to prompt an operation response such as load shedding, and the discharge can be terminated. By automatically tripping the storage battery that has reached the voltage, it is possible to suppress a decrease in the life of the storage battery.

[Brief description of drawings]

FIG. 1 is a block diagram of a power supply facility and a storage battery dischargeable time prediction calculation device.

FIG. 2 is an operation flowchart in a storage battery dischargeable time prediction calculation device 1.

FIG. 3 is a characteristic diagram of a storage battery discharge that is input in advance to a discharge characteristic recording device.

FIG. 4 is an explanatory diagram for obtaining a time required to reach an allowable minimum voltage and a discharge end voltage by using the extracted storage battery discharge characteristic curve.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Storage battery dischargeable time prediction calculation device, 2 ... Operation terminal device, 3 ... Data input conversion device, 4 ... Discharge characteristic recording device,
5 ... Calculation start command device, 6 ... Discharge characteristic comparison device, 7 ... Discharge time calculation device, 8 ... Screen display processing device, 9 ... Storage battery circuit external command device, 10 ... Power supply equipment, 11 ... Storage battery, 12
... charger, 13 ... voltage detector, 14 ... current detector, 15
… Temperature detector, 16… Charger input power loss detector, 17
... Switch.

Claims (2)

[Claims] 1. In a power supply facility composed of an AC power bus, a charger, a storage battery, a distribution board and a load, various detectors are provided in the power supply facility, and a discharge characteristic comparison device is used to check the operating condition of the storage battery. The characteristic of extracting the simulated discharge characteristic curve, predicting and calculating the time when the storage battery voltage is below the allowable minimum voltage of the load after the loss of the charger input power by the discharge time calculation device, and displaying the alarm and the operation guidance A storage battery dischargeable time prediction and calculation device. 2. The method according to claim 1, wherein the arithmetic unit predicts and calculates a time required to stop discharge of the storage battery to a discharge end voltage from the viewpoint of the life loss of the storage battery, and displays an alarm before the fixed time period. , A storage battery dischargeable time prediction calculation device that automatically trips the storage battery from the circuit when the discharge end voltage is reached.