JP6129095B2 - Current interruption detection circuit and current interruption detection method for power storage device - Google Patents

Description

  The present invention provides, for example, current interruption detection for detecting current interruption by current interruption means provided in a power storage module including a plurality of batteries such as capacitors such as lithium ion capacitors and electric double layer capacitors and lithium ion batteries. The present invention relates to a circuit and a current interruption detection method.

  Conventionally, as high-voltage, large-capacity power storage devices, power storage cells such as capacitor cells composed of a plurality of electric double layer capacitors and lithium ion capacitors, and battery cells composed of a plurality of lithium ion batteries, etc. A power storage module configured by connecting a plurality thereof is known.

A power storage device configured by connecting a plurality of such power storage modules for the purpose of further increasing the voltage and capacity is also known.
In such a power storage device, a fuse, a circuit breaker, or the like that blows off when the abnormal current flows and stops the output from the power storage module so that the abnormal current continues to flow due to an abnormal load, etc. Current interruption means is provided.

FIG. 3 is a schematic circuit diagram for explaining a circuit configuration of a conventional power storage device.
As shown in FIG. 3, the power storage device 100, storage module Z (n is a natural number of 1 to m) a plurality of storage cells X _n and a control circuit Y _n for controlling the charging and discharging of the power storage cells X _{n a} plurality of _n power storage module units 102 connected in series, arithmetic processing means 104 for controlling the control circuit Y _n , one output terminal 106 for outputting power from the power storage device 100, and the other output terminal 108; It has.

The arithmetic processing means 104 and the control circuits Y _{1 to} Y _m are daisy chain connected by the serial communication line 110.
In the power storage device 100 configured as described above, a control signal such as activation and deactivation is transmitted from the arithmetic processing unit 104 to the control circuit Y ₁ via the serial communication line 110.

Control circuit Y _1, based on the received control signal, the charging and discharging control of the storage cells X ₁ to control circuit Y ₁ is responsible for control, a control signal to the control circuit Y ₂ via the serial communication line 110 Send.

As described above, the control signals are sequentially transmitted to the control circuits Y _{1 to} Y _m via the serial communication line 110, and finally, the control signals are transmitted from the control circuit Y _n to the arithmetic processing unit 104. become.

The arithmetic processing means 104 determines whether or not a correct control signal has been transmitted to all the control circuits Y _{1 to} Y _m by comparing the transmitted control signal with the returned control signal. 100 reliability is improved. As the determination in the arithmetic processing unit 104, for example, when the transmitted control signal is different from the returned control signal, it is determined that an erroneous control is being performed in any of the control circuits Y _{1 to} Y _m. can do.

In addition, a fuse 112 is provided between the power storage cell X ₁ and the one output terminal 106 so as to blow out when an abnormal high current flows and prevent power from being output from the power storage device 100. Yes.

The control circuits Y _{1 to} Y _m are supplied with power for operation from the storage cells X _{1 to} X _m via power supply lines 108a and 108b, respectively.

JP 2010-193589 A

  However, in such a power storage system in which a plurality of power storage devices 100 are connected in parallel, even if the fuse 112 of one power storage device 100 among the plurality of power storage devices is blown, the output voltage as the power storage system does not change.

  For this reason, simply monitoring the output voltage of the power storage system cannot detect whether the fuse 112 of the power storage device 100 is blown or which fuse 112 of the power storage device 100 is blown.

  If one of the power storage devices that make up the power storage system continues to use the power storage system in a state where the fuse is blown and cannot be used, the load on other power storage devices increases, shortening the life of the power storage system, It may cause a failure.

  In view of the current situation, an object of the present invention is to provide a current interruption detection circuit and a current interruption detection method for a power storage device that can easily and reliably detect the fusing of a fuse of the power storage device.

The present invention has been invented to achieve the above-described object, and the current interruption detection circuit of the power storage device of the present invention includes:
A power storage module having a plurality of power storage cells and a control circuit for controlling charge / discharge of the power storage cells, arithmetic processing means for controlling the control circuit, and one output terminal for outputting power from the power storage cells And the other output terminal, and a current interruption means provided between the storage cell and the one output terminal, a current interruption detection circuit of an electricity storage device in which a plurality of the electricity storage modules are connected,
Fusing detection voltage measuring means for measuring a voltage value based on the potential between the current interruption means and the one output terminal,
In the arithmetic processing means, by comparing the voltage value between the current interruption means and the output terminal measured by the fusing detection voltage measuring means with the voltage value of the storage cell measured by the control circuit, The present invention is characterized in that it is configured to detect current interruption by the current interruption means.

  With this configuration, it is possible to easily and reliably detect whether or not the current interrupting means is interrupted for each power storage device by comparing the potential change before and after the current interrupting means.

  Therefore, even in a power storage system in which a plurality of power storage devices are connected in parallel, it is possible to detect which power storage means of the power storage device is operating and the current is interrupted, and to deal with it early. Therefore, the life of the power storage system can be extended and failure of the power storage cell can be prevented.

  In such a current interruption detection circuit, when the voltage value between the current interruption means and the output terminal and the voltage value of the storage cell are different from each other by a predetermined voltage value, the arithmetic processing means is a fuse. It is preferable to be configured to transmit a fusing detection output.

  In this case, the arithmetic processing means includes input / output means for communicating with a device outside the power storage device, and the current interruption detection output can be transmitted via the input / output means.

In addition, the arithmetic processing unit may include a notification unit that notifies a user when the current interruption detection output is received.
With this configuration, the current interruption can be detected easily and reliably by the arithmetic processing means, and when the current interruption is detected, it is surely given to the user or the master controller of the power storage system. The interruption of current can be notified.

  For this reason, since it is possible to prevent the power storage system from being used continuously without noticing the interruption of the current of the power storage device, the life of the power storage system can be extended and the failure of the power storage cell can be prevented.

The fusing detection voltage measuring means preferably includes a voltage dividing circuit.
Thus, by providing a voltage dividing circuit in the fusing detection voltage measuring means, a high voltage is not input from the fusing detection voltage measuring means to the control circuit or arithmetic processing means, and the control circuit or arithmetic processing means It is possible to prevent failure.

Further, the current interruption detection method of the present invention includes a power storage module having a plurality of power storage cells and a control circuit for controlling charge / discharge of the power storage cells, arithmetic processing means for controlling the control circuit, and the power storage cells. A power storage device including a plurality of power storage modules connected to each other, and one output terminal for outputting power from the power storage device and the other output terminal; and current interrupting means provided between the power storage cell and the one output terminal. A current interruption detection method for a device, comprising:
While measuring the output voltage based on the potential between the current interrupting means and the one output terminal, measure the module voltage of the power storage module,
By comparing the output voltage with the module voltage, the current interruption by the current interruption means is detected.

In this way, by comparing the change in potential before and after the current interrupting means, it is possible to easily and reliably detect whether or not the current interrupting means is interrupted for each power storage device.
Therefore, even in a power storage system in which a plurality of power storage devices are connected in parallel, it is possible to detect which power storage means of the power storage device is operating and the current is interrupted, and to deal with it early. Therefore, the life of the power storage system can be extended and failure of the power storage cell can be prevented.

  In such a current interruption detection method, when a difference of a predetermined voltage value or more is generated between the output voltage and the module voltage, it can be detected that the current is interrupted by the current interruption means. .

  According to the present invention, by monitoring the voltage value based on the potential between the current interrupting means and the output terminal, it is possible to easily and reliably detect the current interrupting by the current interrupting means by the change of the potential before and after the current interrupting means. it can.

FIG. 1 is a schematic circuit diagram of a power storage device for explaining a current interruption detection circuit according to the present embodiment. FIG. 2 is a flowchart showing a flow of current interruption detection in the arithmetic processing unit. FIG. 3 is a schematic circuit diagram for explaining a circuit configuration of a conventional power storage device.

  Hereinafter, embodiments (examples) of the present invention will be described in more detail based on the drawings. In addition, although embodiment of a present Example is described below, this invention is not limited to this embodiment. Moreover, in embodiment used for this invention, it can use suitably for the electrical storage module, electrical storage apparatus, and electrical storage system using electrical storage cells, such as a lithium ion capacitor, an electric double layer capacitor, and a lithium ion battery.

FIG. 1 is a schematic circuit diagram of a power storage device for explaining a current interruption detection circuit according to the present embodiment.
As shown in FIG. 1, power storage device 10 of this embodiment, (n is a natural number of 1 to m) a plurality of storage cells C _n and a control circuit D _n for controlling the charging and discharging of the power storage cells C _n The power storage module M _n , the arithmetic processing means 14 for controlling the control circuits D _{1 to} D _m , and one output terminal 16 and the other output terminal 18 for outputting power from the power storage device 10. .

As shown in FIG. 1, the arithmetic processing means 14 and the control circuit D _n are connected by a communication line 24, and the control circuits D _{1 to} D _m are connected in series by a communication line 24. In the electric storage device 10 configured as described above, the control command transmitted from the arithmetic processing unit 14 will sequentially be transferred from the control circuit D _n to the control circuit D _1.
The control circuits D _{1 to} D _m are supplied with power for operation from the storage cells C _{1 to} C _m via the power supply lines 22a and 22b, respectively.

The control circuits D _{1 to} D _m perform charge / discharge control of the storage cell C _n each responsible for control based on the control command transmitted from the arithmetic processing means 14, and set the voltage value of the storage cell C _n responsible for each. It has a function of measuring and transmitting to the arithmetic processing means 14.

The voltage value of the storage cell C _n measured in the control circuit D _n is sequentially transferred through the control circuits D _{1 to} D _m and transmitted to the arithmetic processing means 14.
The arithmetic processing unit 14 includes an input / output unit 15 for communicating with a higher-level control device outside the power storage device 10 such as a control device that controls a power storage system configured by connecting a plurality of power storage devices 10. For example, the voltage value of the power storage device 10 can be calculated and output based on the voltage value of the power storage cell C _n measured by the control circuit D _n .

Further, a current interrupting means 20 for interrupting the current when an abnormal high current flows between the power storage cell C ₁ and the one output terminal 16 so as not to output power from the power storage device 10. Is provided between the current interruption means 20 and the output terminal 16, and a current interruption detection voltage measuring means 26 for measuring the voltage between the current interruption means 20 and the output terminal 16 is provided. .

  The current interrupting means 20 is not particularly limited as long as it is a means for interrupting the current and protecting the circuit when a current exceeding the rating flows in the circuit due to an abnormality. Etc. can be used.

In this embodiment, current interruption detection voltage measuring means 26, the current interrupting means 20-output terminal 16 between the control circuit D ₁ - a control circuit D resistor R ₁ and R ₂ provided between a between ₂ It is constituted by a voltage divider circuit having an output voltage V _out is configured to be inputted to the control circuit D _1. Reference numeral 23 denotes a rectifying element such as a diode for preventing current from flowing from the control circuit D ₁ to the one output terminal 16.

The output voltage V _out measured by the current interruption detection voltage measuring means 26 in this way is transmitted to the arithmetic processing means 14 via the control circuits D _{1 to} D _m .
On the other hand, the control circuit D _n, together with measures a voltage value of the electric storage cell C _n, the voltage value of the storage cell C _n is sent to the arithmetic processing means 14.

As shown in FIG. 2, the arithmetic processing means 14 constantly or periodically monitors the voltage value of the storage cell C _n (S1), and the voltage value of the storage cell C _n has changed within a predetermined time. In such a case, the following processing is performed.

First, based on the voltage value of the electric storage cell C _n, the module voltage V _M of the storage modules M _n is calculated. A module voltage V _M, compares the output voltage V _out, and that (S2).

When the current interrupting means 20 is not cut off current, the output voltage V _out measured by the current interruption detection voltage measuring means 26, the module voltage V _M is kept at a constant ratio.

That is, the output voltage V _out and the module voltage V _M is held at a fixed voltage difference within a predetermined voltage value. In this case, it is determined that current interruption by the current interruption means 20 has not occurred (S3), and detection of current interruption is continued.

However, if the current interrupting means 20 is blown, this means that the output voltage V _out measured by the current interruption detection voltage measuring means 26 changes significantly, the control circuit D ₁ module voltage V _M which is determined by balance with the collapse, the difference between the above predetermined voltage value is generated in the output voltage V _out and the module voltage V _M.

In the arithmetic processing unit 14, when the voltage difference higher than a predetermined voltage value and the output voltage V _out and the module voltage V _M is determined to have occurred, it is determined that the interruption of the current by current interrupting means 20 has occurred (S4), a current interruption detection output is transmitted via the input / output means 15 (S5), so that the current interruption by the current interruption means is notified to the power storage system and the user.

  In this embodiment, the current interruption by the current interruption means is informed via the input / output means 15; however, for example, when a current interruption detection output is received, the user is notified by light or sound. You may comprise so that the alerting | reporting means to alert | report to may be provided.

In this embodiment, a voltage dividing circuit provided between the current interruption means 20 and the output terminal 16 and between the control circuit D ₁ and the control circuit D ₂ is used as the current interruption detection voltage measuring means 26. However, it suffices to measure the voltage between the current interrupting means 20 and the output terminal 16, one end of the voltage dividing circuit may be connected between any control circuits, and one end of the voltage dividing circuit is grounded. It can also be configured to measure the potential between the current interrupting means 20 and the output terminal 16.

  As described above, the current interruption detection voltage measuring means 26 may have any configuration as long as the voltage value based on the potential between the current interruption means 20 and the output terminal 16 is measured. Absent.

Although the preferred embodiment of the present invention has been described above, the present invention is not limited to this. In the above embodiment, the control circuit D _n measures or charges the voltage value of the storage cell C _n. Although only do or perform control of the discharge, such as a voltage balance between the storage cells C _n the equalization control may be configured to perform for correcting, within the scope of the objects of the present invention Various changes are possible.

10 power storage device 12 battery module 14 processing means 15 output means 16 output terminal 18 Output terminal 20 current interrupting means 22a power supply line 22b power supply line 23 rectifying element 24 voltage measuring means C _n power storage communication line 26 current interruption detector Cell D _n Control circuit M _n Power storage module R ₁ Resistor R ₂ Resistor 100 Power storage device 102 Power storage module section 104 Arithmetic processing means 106 Output terminal 108 Output terminal 109a Power supply line 109b Power supply line 110 Serial communication line 112 Fuse X _n storage cell Y _n control circuit Z _n storage module

Claims (7)

A power storage module having a plurality of power storage cells and a control circuit for controlling charge / discharge of the power storage cells, arithmetic processing means for controlling the control circuit, and one output terminal for outputting power from the power storage cells And the other output terminal, and a current interruption means provided between the storage cell and the one output terminal, a current interruption detection circuit of an electricity storage device in which a plurality of the electricity storage modules are connected,
A voltage measurement means for detecting a current interruption that measures a voltage value based on a potential between the current interruption means and the one output terminal;
In the arithmetic processing means, by comparing the output voltage between the current interruption means and the output terminal measured by the current interruption detection voltage measurement means and the module voltage of the power storage module measured by the control circuit, A current interruption detection circuit configured to detect interruption of current by the current interruption means.   2. The apparatus according to claim 1, wherein the arithmetic processing unit transmits a current interruption detection output when a difference of a predetermined voltage value or more occurs between the output voltage and the module voltage. The current interruption detection circuit according to 1.   The said arithmetic processing means is provided with the input / output means for communicating with the apparatus outside the said electrical storage apparatus, The said electric current interruption detection output is transmitted via the said input / output means. The current interruption detection circuit described.   The current interruption detection circuit according to claim 2, wherein the arithmetic processing means includes notification means for notifying a user when the current interruption detection output is received.   The current interruption detection circuit according to any one of claims 1 to 4, wherein the current interruption detection voltage measuring means includes a voltage dividing circuit. A power storage module having a plurality of power storage cells and a control circuit for controlling charge / discharge of the power storage cells, arithmetic processing means for controlling the control circuit, and one output terminal for outputting power from the power storage cells And the other output terminal, and a current interruption means provided between the electricity storage cell and the one output terminal, and a current interruption detection method for an electricity storage device in which a plurality of the electricity storage modules are connected,
While measuring the output voltage based on the potential between the current interrupting means and the one output terminal, measure the module voltage of the power storage module,
A current interruption detection method, wherein the current interruption by the current interruption means is detected by comparing the output voltage and the module voltage. The current according to claim 6 , wherein when the difference between the output voltage and the module voltage is greater than a predetermined voltage value, it is detected that the current is interrupted by the current interrupting means. Blocking detection method.

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