JPH11136867A - Energy storage system - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To enable external control of a built-in charge / discharge device in a power storage system with built-in charge / discharge control means, and to enable system management corresponding to control to maintain and maintain safety and security. Improve the performance. Self-diagnosis means for checking whether there is an abnormality in a power storage system, means for converting each measured value of voltage, current, and temperature and a self-diagnosis result into a digital signal, and transmitting the digital signal outside the power storage system And a bidirectional communication means for transmitting an external control signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power storage system capable of externally monitoring an operation state.

[0002]

2. Description of the Related Art Conventionally, although described in Japanese Patent Application Laid-Open No. Hei 6-20665, the electric equipment has a power storage function for the purpose of obtaining information necessary for display and information for specifying a manufacturer. A battery pack provided with a temperature detection terminal and an information output terminal on the battery pack has been devised.

[0003]

In such a method, the charging / discharging means is provided outside the battery pack and can output internal information relating to the battery. However, it is not assumed that the internal functions are externally controlled. However, such a method has a problem that the power storage system having the built-in charge / discharge control means cannot perform appropriate control from outside the built-in charge / discharge device and system management corresponding to the control. In addition, it was not assumed that the battery pack was placed separately from the device, and no consideration was given to externally checking whether or not the battery pack was abnormal.

[0004]

According to the present invention, there is provided a power storage system in which a battery pack including at least two or more secondary batteries is used as a power storage means. Means for measuring the voltage between the terminals of each battery, means for measuring the current flowing through the battery, means for measuring the surface temperature or internal temperature or ambient temperature of the battery, and the presence or absence of an abnormality inside the power storage system. Self-diagnosis means for checking; means for converting the measured values of the voltage, current, and temperature and the self-diagnosis result into digital signals; and transmitting the digital signals to the outside of the power storage system and transmitting an external control signal. The power storage system was provided with bidirectional communication means.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a block diagram of a power storage system according to an embodiment of the present invention. Reference numerals 1a to 1d denote secondary batteries composed of lithium ion batteries. In the present embodiment, the battery pack is constituted by four-by-one parallel connections and used as the power storage means 2. Terminal voltage measurement lines 3a to 3e for measuring voltage are connected to both terminals of each of the secondary batteries 1a to 1d.
The other ends of the terminal voltage measuring lines 3a to 3e are connected to the inter-terminal voltage measuring means 4.

[0006] A shunt resistor 5 for measuring current is connected in series to the positive electrode side of the power storage means 2, and a current is measured by measuring a voltage drop across the shunt resistor at both ends of the shunt resistor 5. Current measuring means 6 is connected. It is needless to say that the shunt resistor 5 is equivalent even if it is provided on the negative electrode side of the power storage means.

The signal output lines of the inter-terminal voltage measuring means 4 and the current measuring means 6 are connected to a digital signal converting means 7 for converting an analog signal to a digital signal. 2, a temperature measuring means 8 for measuring the ambient temperature of the secondary battery is provided. One end of the shunt resistor 5 is connected to the charge / discharge control means 9, and the charge / discharge control means 9 has a positive charge line 1.
0, the inverter unit 11 and the system control unit 12 are connected.

The inverter unit 11 has a negative charging line 13,
System control unit 12 and inverter output lines 14a, 14
b is connected. The inverter unit 11 can control output on / off, output voltage and frequency by a control signal from the system control unit 12.

The device communication means 15 includes a device communication line 16.
a, 16b and the system control unit 12 are connected, and the device communication means 15 performs bidirectional communication with a device to which power is supplied from the power storage system. The telephone communication unit 17 is connected to telephone lines 18a and 18b, a telephone line monitoring unit 19, an automatic telephone transmission unit 20, and a system control unit 12. The telephone communication unit 17 performs two-way communication with the telephone line and electrical connection. Perform insulation. The telephone line monitoring means 19 includes a telephone line 18a,
Phone line 1 by detecting the impedance and polarity of 18b
It is possible to detect whether or not 8a and 18b are in use, and to detect a slight reversal to perform a no-ringing automatic incoming call.

The automatic telephone calling means 20 includes a system control unit 1
2 has a function of automatically transmitting a call to a predetermined partner registered in advance in accordance with the signal from 2. The system control unit 12 is configured by a CPU or the like, and has programs for system control and communication control installed in advance and also has a memory function.

Next, the operation of this embodiment will be described with reference to FIG. FIG. 2 is a processing flowchart of a part according to the present invention. The presence or absence of an abnormality in the power storage system is checked by self-diagnosis means (not shown) constituted by a program built in the system control unit 12 (21). The process is performed (22), and thereafter, the device side is notified of the abnormality by the device communication means 15 (23). Next, the telephone line monitoring means 19 checks whether the telephone lines 18a and 18b are in use (2).
4) If the telephone lines 18a and 18b are not in use, the telephone is automatically transmitted by the telephone automatic transmission means 20 to a predetermined party set in advance (25). The self-diagnosis result is transmitted from the system control unit 12 to the telephone lines 18a and 18b (26).

If there is no abnormality as a result of the self-diagnosis, the temperature around the secondary battery is measured by the temperature measuring means 8 (28), and the measured temperature data is converted into a digital signal by the digital signal converting means 7. In the system controller 12.

Next, a current is measured by the shunt resistor 5 and the current measuring means 6 (28), and the measured current data is converted into a digital signal by the digital signal converting means 7 and recorded in the system control unit 12. Next, terminal voltage measuring means 4
To measure the voltage between the terminals of each of the secondary batteries 1a to 1d.
9) The measured terminal voltage data is converted into a digital signal by the digital signal converting means 7 and the system control unit 12
To record.

Next, the system control unit 12 checks whether or not the temperature data is within a preset allowable range for charge and discharge (30). (32), and if it is out of the normal range, the process immediately proceeds to the abnormality handling process (22). If it is in the normal range, information indicating that the temperature is out of the allowable range is sent to the device. Send (3
3).

If the temperature data is within the allowable range, it is checked whether the current data is within a preset allowable range for charging and discharging (34). If the current data is outside the allowable range, the current data is stored in the power storage system. (35), and if the current data is out of the normal range due to a short circuit or an open circuit, the process immediately proceeds to the abnormality handling process (22), and the current data is within the normal range. In this case, information indicating that the current is out of the allowable range is transmitted to the device (36).

If the current data is within the allowable range, it is checked whether the inter-terminal voltage data is within a preset normal range (37). If the inter-terminal voltage data is out of the normal range, an abnormality is immediately detected. A corresponding process (22) is performed, and if the inter-terminal voltage data is within the normal range, it is checked whether the inter-terminal voltage data can be discharged (38). It is checked whether or not the battery is discharged (39).
0).

Further, it is checked whether or not it is necessary to notify the device that the discharge has occurred (41). If the notification is required, information on the discharge is transmitted to the device by the device communication means 15 (42). . When the battery is not discharged, it is checked whether the inter-terminal voltage data can be charged (43). If the inter-terminal voltage data is at a chargeable level, it is checked whether the battery is charged (44). , A charge process is performed (45), and it is checked whether or not it is necessary to notify the device side of charging (46). If notification is required, the device side is charged by the device communication means 15. Is transmitted (47). In this embodiment, an AC voltage is supplied to the device by the inverter unit 11 via the charge / discharge control means 9 in the discharge.

The output of the inverter unit 11 can be controlled by a control signal from the system control unit 12, and the communication unit 1
By sending a control signal to the system control unit 12 from the device 5, control can be performed from the device side. Further, since the telephone line monitoring means 19 is provided with a no ringing automatic incoming call function, the power storage system is called up by telephone using a no ringing call service, and the system control unit 1 is externally provided via the telephone lines 18a and 18b.
2, a control signal is sent to instruct self-diagnosis, temperature measurement, voltage measurement between terminals, current measurement, and the like, and the results can be remotely collected by a two-way communication function.

[0019]

According to the power storage system of the present invention, it is possible to inspect the voltage between the terminals of each battery, the current flowing through the battery, the surface temperature of the battery, the internal temperature or the ambient temperature, and the presence or absence of abnormality in the system at any time from the outside. This is effective for system maintenance and security. Further, the charge / discharge control means can be controlled from the outside, and the data can be sequentially monitored by bidirectional communication. In addition, since communication is performed using digital signals, malfunction is not caused by noise, so that the reliability is high, and the present invention is suitable for a power storage system using a large number of high-capacity secondary batteries such as lithium ion batteries. In addition, you can self-check at any time or periodically and communicate the results to the outside,
Even if the power storage system is installed separately from the equipment and cannot be inspected daily, it can be checked for any abnormality, and a highly safe system can be provided.

Further, an inverter section for converting the output of the secondary battery into an alternating current and outputting the converted output is provided, and the output of the inverter can be variably controlled by an external control signal. The combined power supply can be performed, and the same power storage system can be used for devices having different power supply specifications. In addition, since a telephone communication function for exchanging information with the outside using a telephone line is provided, it is possible to centrally manage the power storage system from a remote place using the telephone line, and secure system maintenance at low cost.

Further, since the system is provided with the means for detecting the use state of the telephone line and the automatic telephone transmission means, the abnormality information and the self-check result can be immediately determined when an abnormality occurs in the power storage system or at a regular self-check. Can be notified to the place, prompt response and security can be ensured.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of a power storage system according to the present invention.

FIG. 2 is a processing flowchart of a part of the power storage system according to the present invention.

[Description of Signs] 1a to 1d: secondary battery, 2: power storage means, 4: terminal voltage measurement means, 6: current measurement means, 7: digital signal conversion means, 8: temperature measurement means, 9: charge / discharge control Means, 11: inverter section, 15: communication means for equipment, 17: telephone communication section, 18a, 18b: telephone line, 19: telephone line monitoring means, 20: automatic telephone transmission means.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI H02J 7/10 H02J 7/10 L H04Q 9/00 311 H04Q 9/00 311H

Claims (1)

[Claims] In a power storage system using a battery pack composed of at least two or more secondary batteries as power storage means, charge / discharge control means for controlling charge / discharge of the power storage means, and a terminal for measuring a voltage between terminals of each battery. Inter-voltage measurement means, current measurement means for measuring the current flowing through the battery, temperature measurement means for measuring the surface temperature or internal temperature or ambient temperature of the battery, and self-diagnosis means for checking whether there is any abnormality inside the power storage system. Digital signal conversion means for converting the measured values of the voltage, current, and temperature into digital signals; and a bidirectional signal for transmitting the digital signals and the self-diagnosis result to the outside of the power storage system and transmitting a control signal from the outside. A power storage system comprising communication means.