JP2000116025A - Recharging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce voltage and current ripples in a recharging device consisting of a recharger module and a chopper power converter. SOLUTION: In a chopper inductor 301 for composing a chopper power converter 106, a plurality of inductors L1 and L2 are connected in series, a switch DL2 is connected in series with the inductor L1 that is one of the inductors, a switch DL1 is connected in parallel with them between the terminals where the partial inductors and switches are connected in series, and the switches are switched according to the value of current that flows to a recharger module, thus obtaining a reliable recharging device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a storage device such as a lithium secondary battery and an electric double layer capacitor, and a power storage device including a power converter for charging and discharging the storage device.

[0002]

2. Description of the Related Art Conventionally, there has been an uninterruptible power supply for supplying DC power stored in a battery when power is cut off due to some abnormality. For example, JP-A-7-298516 describes a related technique.

FIG. 7 shows a conventional uninterruptible power supply. 70
1 is a commercial power supply, 702 is an AC / DC converter circuit, 7
03 is a step-down chopper circuit, 704 is a storage battery, 705 is a step-up chopper circuit, 706 is a DC / AC inverter circuit,
707 is a load.

Normally, the AC power from the commercial power
Through a C / DC converter circuit 702 and a DC / AC inverter circuit 706, the power is supplied to a load 707 such as a computer or a communication device. At the same time, the step-down chopper circuit 70
3, the storage battery 704 is charged.

At the time of a power failure, the DC voltage of the storage battery 704 is boosted by the boost chopper circuit 705 and the DC power is supplied to the DC / AC inverter circuit 706. And this DC
DC power is converted into AC power by the / AC inverter circuit 706 and supplied to the load 707.

[0006]

As in the conventional uninterruptible power supply, the battery is a DC power source, but a general load requires AC power. Further, the voltage between terminals of a general battery changes depending on the amount of charge and discharge. For this reason, in a power storage device, an electric device, a motor, and the like using a power storage device, a DC / DC converter that controls charging and discharging and an A / D converter that converts AC / DC voltage are used.
Power converters such as C / DC converters and DC / AC inverters are required.

In addition, these power converters generally use a chopping operation of a semiconductor switch and an induced voltage generated in an inductor in a conversion process. Therefore, the input and output currents and voltages of these power converters contain many high-frequency ripple components that fluctuate with the chopping operation.

FIG. 8 shows characteristics of a discharge time, a voltage between terminals of a capacitor, and a discharge current when a capacitor (lithium secondary battery) is discharged via a boost chopper circuit. It can be seen that both the voltage and the current fluctuate finely and that many ripple components are contained.

FIG. 9 shows characteristics of the discharge time and the self-temperature rise of the battery at this time. For comparison, the characteristics of discharge time and self-temperature rise when a constant resistance is connected for discharge are also shown. Generally, the discharge reaction of a battery is an exothermic reaction, and the temperature of the battery rises as the discharge proceeds.
However, it can be seen that the self-temperature rise is greater when discharging through the boost chopper circuit than when discharging with constant resistance. Such an increase in the self-temperature rise of the battery decreases the life of the battery. In addition, an excessive increase in self-temperature raises dangerous abnormalities such as explosion, rupture, and ignition. Furthermore, efficiency is reduced due to heat loss.

FIG. 10 is an enlarged view of the time axis of FIG.
Shown in Voltage at the switching frequency of the semiconductor switch,
It can be seen that both the current greatly jumped and contained a ripple component.

When a large ripple component is contained in the voltage or the current, it is difficult to correctly detect them. In particular, in a storage battery such as a lithium secondary battery, in which voltage and current need to be strictly detected and controlled, this is a serious problem.

For this reason, when connecting the chopper type power converter and the battery, there is a need to remove or reduce the ripple component.

On the other hand, as described above, in the chopper type power converter, in the power conversion process, the chopping operation of the semiconductor switch and the induced voltage generated in the inductor are applied. For this reason, the ripple can be reduced to some extent by increasing the switching frequency or increasing the inductance.

However, there is a practical upper limit to increasing the switching frequency and increasing the inductance value. In particular, the higher the current or the higher the voltage, the lower the switching frequency of the semiconductor switch that satisfies this. Further, the achievable inductance value becomes smaller. These semiconductor switches and inductors are expensive, heavy, and large.

The present invention has been made in consideration of the above problems, and has as its object to reduce voltage and current ripples in a power storage device including a power storage module and a power converter.

[0016]

According to the present invention, there is provided a power storage device including a power storage module including one or a plurality of power storages and a chopper type power converter, wherein the power storage device is connected in series with the power storage module. An inductor is inserted, and a capacitor is added in parallel with both ends of the series connection of the capacitor module and the inductor.

In a power storage device including a power storage module group in which a plurality of power storage modules each including one or a plurality of power storage devices are connected in series and a chopper type power converter, each of the power storage modules is connected in series An inductor is inserted, and capacitors are respectively added to both ends of the series connection part of the capacitor module and the inductor in parallel with them.

Alternatively, a plurality of inductors are connected in series to the chopper inductor constituting the chopper type power converter, and a part of the inductors is connected in series with a rectifier, and the part inductor and the rectifier are connected together. A rectifier having a polarity opposite to that of the rectifier is connected in parallel to both ends connected in series.

Alternatively, a current detection circuit for detecting a current flowing through the power storage module is added, and the chopper inductor constituting the chopper type power converter includes a plurality of inductors connected in series, and some of the inductors are connected in series. Are connected in series, switch means are connected in parallel with both ends of the partial inductor and the switch means connected in series, and these switch means are switched in accordance with the detection values of the current detection circuit. Switch.

When a battery control circuit is connected in parallel with the capacitor, the capacitor and the capacitor are connected in parallel, and the capacitor control circuit is connected in parallel with the capacitor and the capacitor via an inductor. May be.

In the power storage device having the above-described structure, the inductor inserted in series with the power storage module has a high impedance and the capacitor connected in parallel with the power storage module has a low impedance with respect to the high-frequency power (ripple component). Therefore, the high-frequency power, that is, the ripple component does not pass through the inductor having the high impedance, but passes through the low-impedance capacitor side.

For DC power, the inductor inserted in series with the battery module has low impedance, and the capacitor connected in parallel with the battery module has high impedance. Therefore, the DC power does not pass through the high-impedance capacitor but passes through the low-impedance inductor.

As a result, high-frequency power that adversely affects the battery and the battery control circuit does not pass through the battery and the battery control circuit, and conversely, only DC power required for the battery and the battery control circuit can pass.

Further, the chopper inductor constituting the chopper type power converter includes a plurality of inductors connected in series, a part of the inductors is connected in series with a rectifier, and the part inductor and the rectifier are connected in series. When a rectifier having a polarity opposite to that of the rectifier is connected in parallel to both ends connected in series, the rectifier blocks or bypasses a current flowing therethrough depending on the direction. That is, the value of the chopper inductor changes depending on the direction of the current.

Alternatively, a current detection circuit for detecting a current flowing through the storage battery module is added, and the chopper inductor constituting the chopper type power converter includes a plurality of inductors connected in series, and some of the inductors are connected in series. When switch means are connected in series, and when the switch means is connected in parallel with both ends of the partial inductor and the switch means connected in series, the switch is switched in accordance with a detection value of the current detection circuit. The means are switched. That is, the value of the chopper inductor changes in accordance with the value of the current flowing through the capacitor.

As a result, the inductance value is increased in accordance with the direction of current flow (charging or discharging) or the current value, and the ripple is reduced.

Alternatively, when a battery control circuit is connected in parallel with the capacitor, the capacitor and the capacitor are connected in parallel, and the capacitor control circuit is connected in parallel with the capacitor and the capacitor via an inductor. For high-frequency power (ripple component), the inductor has high impedance, and the capacitor connected in parallel with the capacitor has low impedance. Therefore, the high-frequency power, that is, the ripple component does not pass through the inductor having the high impedance, but passes through the low-impedance capacitor side.

For DC power, the inductor has a low impedance, and the capacitor connected in parallel with the capacitor has a high impedance. Therefore, the DC power does not pass through the high-impedance capacitor but passes through the low-impedance inductor.

As a result, high-frequency power that adversely affects the battery and the battery control circuit does not pass through the battery and the battery control circuit, and conversely, only DC power required for the battery and the battery control circuit can pass.

Thus, in a power storage device including a power storage module and a chopper type power converter, voltage and current ripples can be reduced.

[0031]

Embodiments of the present invention will be described below in detail with reference to the drawings. In the figure, the same reference numerals are given to those having two or more identical parts, and the description is omitted.

FIG. 1 is a diagram showing a first embodiment of the present invention. In the figure, 101 is a battery, 102 is a battery control circuit, 103 is a battery module, 104 is an inductor, 105 is a capacitor, and 106 is a chopper type power converter.

A plurality of capacitors 101 are connected in series and parallel,
At the same time, the battery 101 and the battery control circuit 102 are connected in parallel to each other to form a battery module 103.

The battery control circuit 102 comprises a voltage detecting circuit for detecting the voltage of each battery 101, a comparing circuit for comparing these voltages, a bypass circuit connected in parallel with the battery and bypassing the current flowing through the battery. You.
Then, voltage detection is performed to determine whether or not each of the capacitors 101 is within the operating voltage range, and voltage imbalance between the respective capacitors 101 is improved.

Then, an inductor 104 is inserted in series with the battery module 103,
A capacitor 105 is connected in parallel with both ends of a series connection of the inductor and the inductor 104, and a chopper type power converter 106 is connected in parallel with these.

The chopper type power converter 106 is a bidirectional step-up / step-down chopper circuit here. For this reason,
When the battery module 103 is charged, a step-down chopper operation is performed, and when the battery module 103 is discharged, a step-up chopper operation is performed to control the charge / discharge voltage and current of the battery module 103.

Here, the chopper type power converter 106 is
The charge and discharge paths may be separated and configured as a unidirectional boost chopper circuit or step-down chopper circuit.

The inductor 104 inserted in series with the capacitor module 103 has a high impedance with respect to the high-frequency power (ripple component) generated in these charging and discharging operations of the chopper type power converter 106, and the capacitor module 103 Capacitor 1 connected in parallel with
05 has a low impedance. For this reason, the high frequency power, that is, the ripple component does not pass through the high impedance inductor 104, and the low impedance capacitor 10
Go through the 5 side.

Now, suppose that the frequency of the ripple component is 16 k
Hz, 10 μH for the inductor 104, and the capacitor 105
Is 100 μF, the impedance of the inductor 104 is 1Ω, and the impedance of the
1Ω. As is clear from this, the inductor 10
4 and the impedance of the capacitor 105 is 10: 1.
It can be seen that most of the ripple component flows through the capacitor 105.

Further, the values of the inductor 104 and the capacitor 105 need only be very small. In particular, in order to realize the above value by a coil, the inductor 104 is a value that can be realized by making one turn of a conducting wire on a magnetic core. In addition, it is possible to easily realize a component having good workability such as a cut core or the like.

As described above, the values of the inductor 104 and the capacitor 105 need to be very small, and it is possible to realize a small size, light weight, and low cost.

For DC power, the inductor 104 inserted in series with the battery module 103 has low impedance, and the capacitor 105 connected in parallel with the battery module 103 has high impedance. Therefore, the DC power does not pass through the high-impedance capacitor 105 and the low-impedance inductor 104
Pass through.

As a result, the high-frequency power that adversely affects the battery 101 and the battery control circuit 102 is stored in the battery 101
And the battery 101 does not pass through the battery control circuit 102.
Only the DC power necessary for the battery control circuit 102 can pass.

For this reason, it is possible to prevent the self-temperature rise of the battery 101 from increasing due to the high-frequency power (ripple component) generated by the chopper type power converter 106 during the charge / discharge operation. In addition, it is possible to avoid dangers such as a reduction in the life of the battery 101 due to an increase in the self-temperature and explosion, rupture, and ignition, thereby improving the life, performance, and safety. Furthermore, the storage device 10
1 is reduced, and high efficiency is achieved.

Further, since the ripple component of the voltage and the current is bypassed, each voltage and the current of the battery 101 can be detected correctly, and the reliability is improved.

In addition, since the high-frequency power passing through the battery module 103 is reduced, the chopper-type power converter 106 can be designed to increase the amount of high-frequency power generated. That is, it is possible to use a low-frequency semiconductor switch or a low-inductance inductor, and it is possible to achieve weight reduction, size reduction, and cost reduction at the same time.

Further, it is possible to realize a large current and a high voltage, which have been difficult to realize.

As described above, according to the present embodiment, the voltage and current ripples are reduced, their detection accuracy and reliability are improved, the temperature rise of the battery is reduced, and the safety and life of the battery are reduced.
Performance can be improved, and a light-weight, small-sized, inexpensive, highly reliable, and highly safe power storage device can be realized. Further, these can be realized even with a large current and a high voltage.

FIG. 2 is a diagram showing a second embodiment of the present invention. Inductor 10 in series with capacitor module 103
4 is inserted, the capacitor module 103 and the inductor 1
A capacitor 105 is connected to both ends of the series connection part 04 in parallel with them. And the storage module 1
The series connection of the capacitor 03 and the inductor 104, and the unit of the capacitor 105 connected in parallel with these, are further connected in series to form a battery module group. At the same time, chopper type power converters 106 are connected to both ends of the battery module group.

For this reason, similarly to the first embodiment, the high-frequency power (ripple component) generated in the charging / discharging operation of the chopper type power converter 106 is not affected by the power storage module 1.
The inductor 104 inserted in series with the capacitor 03 has a high impedance, and the capacitor 105 connected in parallel with the battery module 103 has a low impedance. Then, the high-frequency power, that is, the ripple component, does not pass through the inductor 104 having a high impedance, but passes through the low-impedance capacitor 105 side.

For DC power, the inductor 104 inserted in series with the battery module 103 has low impedance, and the capacitor 105 connected in parallel with the battery module 103 has high impedance. Therefore, the DC power does not pass through the high-impedance capacitor 105 and the low-impedance inductor 10
Go through 4.

As a result, the high-frequency power that adversely affects the battery 101 and the battery control circuit 102 is supplied to the battery 101
And the battery 101 does not pass through the battery control circuit 102.
Only the DC power necessary for the battery control circuit 102 can pass.

In particular, when a large number of power storage devices 101 are connected in series, it is necessary to set the withstand voltage of the capacitors 105 connected to both ends thereof high, which leads to an increase in size and cost of the capacitors 105. However, in this case, since the capacitors 105 are connected in parallel for each of the power storage modules 103, the capacitors 105 can be suppressed to a low withstand voltage of the power storage module 103.

For this reason, voltage and current ripples are reduced, their detection accuracy and reliability are improved, the temperature rise of the battery is reduced, and the safety, life, and performance of the battery are improved. A highly reliable and highly secure power storage device can be realized. Further, these can be realized even with a large current and a high voltage.

FIG. 3 is a diagram showing a third embodiment of the present invention. In the figure, reference numeral 301 denotes a chopper inductor. In the chopper inductor 301, two inductors L1 and L2 are connected in series, a rectifier DL2 is connected in series with L1, and the inductor L1 and the rectifier D
A rectifier DL1 having a polarity opposite to that of the rectifier DL2 is connected in parallel to both ends where L2 is connected in series.

Then, a storage battery module 103 composed of a plurality of storage batteries 101 and a chopper inductor 301
Constitute a power storage device.

Here, each of L1 and L2 is constituted by one inductor, but may be constituted by a plurality of inductors. Although a rectifier uses a diode, a thyristor or a switch can be used.

According to such an embodiment, the current at the time of discharging is blocked by DL2 and does not pass through L1, but passes through DL1.
Therefore, the inductance of the chopper inductor 301 at the time of discharging has a value of L2. Conversely, the current during charging is DL
1 passes through L1, DL2 and L2 to block. Therefore, the inductance of the chopper inductor 301 during charging is the value of the sum of L1 and L2. That is, the inductance of the chopper inductor 301 is larger during charging than during discharging.

In general, when comparing the current values at the time of charging and at the time of discharging, the current value at the time of charging is set smaller. This is because, like an uninterruptible power supply, the frequency of power outages and the time of power outages are small, and sufficient charging time can be obtained, and the charging efficiency can be increased. In addition, current detection and control accuracy during charging and discharging generally require higher accuracy during charging. This is to detect and control a small current when detecting the end of charging with a current value, when grasping the amount of charge by integrating time and current value, or when performing rescue charging of a battery 101 in an overdischarged state. This is because it is necessary.

Therefore, the accuracy of current detection and current control can be improved by increasing the inductance of the chopper inductor 301 during charging and reducing the ripple as described above. Further, since the current value at the time of charging is small, the inductor L1 can be realized light-weight, small-sized, and inexpensively despite the large inductance value.

The inductance value and current rating of the chopper inductor 301 can be optimized between charging and discharging.
Can be realized lightweight, small, and inexpensively.

FIG. 4 is a diagram showing a fourth embodiment of the present invention. In the figure, reference numeral 401 denotes a current detection circuit, which is composed of a shunt resistor R and a comparator COMP, but can be realized by another configuration.

In the chopper inductor 301, two inductors L1 and L2 are connected in series.
A P-type MOS transistor M2 is connected as a switch in series with the inductor L1 and the P-type MOS transistor M2.
2 are connected in series, a P-type MOS transistor M
One switch is connected in parallel. And P-type MO
The gate of the S transistor M2 and the gate of the P-type MOS transistor M1 via the inverter INV are connected to the output of the comparator COMP.

The battery module 103 composed of a plurality of capacitors 101 and the chopper inductor 30
1. Chopper type power converter 1 including current detection circuit 401
06 constitutes a power storage device.

Here, the chopper inductor 301
Although L1 and L2 are each configured by one inductor, they may be configured by a plurality of inductors.
Although a P-type MOS transistor is used, other elements such as a thyristor and a relay can be used.

According to such an embodiment, the current detection circuit 4
In response to the detection value of 01, the current at the time of discharging is released by M2 and does not pass through L1, but passes through M1. Therefore, the inductance of the chopper inductor 301 at the time of discharging has a value of L2. Conversely, the current during charging is L1 because M1 is open.
1, M2 and L2. Therefore, the inductance of the chopper inductor 301 during charging is the value of the sum of L1 and L2. That is, the inductance of the chopper inductor 301 is larger during charging than during discharging.

Accordingly, as in the third embodiment, the accuracy of current detection, voltage detection, and current control can be improved by increasing the inductance of the chopper inductor 301 during charging and reducing the ripple. Becomes
Further, since the current value at the time of charging is small, the inductor L1 can be realized light-weight, small-sized, and inexpensively despite the large inductance value.

The inductance value and the current rating of the chopper inductor 301 can be optimized between charging and discharging.
Can be realized lightweight, small, and inexpensively.

Since the current detection circuit 401 is configured to detect the direction of the current, the inductance value of the chopper inductor 301 is changed between charging and discharging according to the detected value. However, the current detection circuit can be configured so that the current value can be identified by an operational amplifier, a microcomputer, or the like, and the switch can be operated arbitrarily.

According to this, particularly, when the end of charging is detected by the current value, when the amount of charge is grasped by integrating the time and the current value, or when the over-discharged battery 101 is rescue-charged, the very small current is detected. When it is necessary to perform the detection and control, the inductance value of the chopper inductor 301 can be increased, and the detection and control of a minute current can be realized.

FIG. 5 is a diagram showing a fifth embodiment of the present invention. The storage module 103 includes a plurality of storage devices 101.
Are connected in series, a capacitor 101 and a capacitor 105 are respectively connected in parallel, and both ends thereof are connected to an inductor 104.
Is connected to the battery control circuit 102 via the

The power storage device is constituted by the power storage module 103 and the chopper type power converter 106. Here, the chopper type power converter 106 is a bidirectional step-up / step-down chopper circuit, but may be configured as a unidirectional step-up / step-down chopper circuit or the like.

According to the present invention, the inductor 104 has a high impedance with respect to the high-frequency power (ripple component), and the capacitor 10 connected in parallel with the capacitor 101
5 becomes low impedance. Therefore, the high-frequency power, that is, the ripple component does not pass through the inductor 104 having a high impedance, and the capacitor 105 has a low impedance.
Pass by the side.

For DC power, the inductor 1
04 has a low impedance, and the capacitor 105 has a high impedance. Therefore, the DC power does not pass through the high impedance capacitor 105 but passes through the low impedance inductor 104.

As a result, the high-frequency power that adversely affects the battery 101 and the battery control circuit 102 is stored in the battery 101
And the battery 101 does not pass through the battery control circuit 102.
Only the DC power necessary for the battery control circuit 102 can pass.

Therefore, the application of voltage and current ripples to the battery 101 and the battery control circuit 102 is reduced, and the accuracy and reliability of voltage and current detection can be improved. In addition, the temperature rise of the battery 101 is reduced, and the safety, life, and performance of the battery 101 can be improved. And lightweight, small, inexpensive,
A highly reliable and highly safe power storage device can be realized.

FIG. 6 is a diagram showing a sixth embodiment of the present invention. In the figure, 601 is a commercial power source, 602 is a photovoltaic power generator, 603 is a load device, 604 is a control converter, 6
05 is a switch, and 606 is an AC / DC converter.

The control converter 604 is connected to the AC / DC converter 6
06 and a chopper type power converter 106 composed of a step-up / step-down chopper circuit. Then, the battery module 10
3 is a chopper type power converter 1 via an inductor 104.
06. The storage module 103
And a capacitor 1 at both ends of the series connection of the inductor 104
05 is connected.

On the other hand, the solar power generation device 602 and the load device 6
03, the control converter 604 is connected to a common commercial power supply 601 via a switch 605, respectively. at the same time,
Solar power generation device 602, load device 603, control converter 6
04, the switch 605, and the storage control circuit 102 are connected to the MCU in the control converter 604 by a bidirectional signal system.

The solar power generation device 602 uses a solar cell,
It is a device that converts sunlight into DC power and outputs AC power by an inverter device.

The load device 603 is a household electric appliance such as an air conditioner, a refrigerator, a microwave oven, and a lighting device, and an electric device such as a motor, a computer, and a medical device.

The control converter 604 uses an AC / DC converter 606 to convert AC power to DC power, or to convert DC power to AC power.
This is a charging / discharging device using a chopper type power converter 106. In addition, the charge / discharge control and the above-described solar power generation device 60
2. It also serves as a controller for controlling devices such as the load device 603.

Here, these devices are provided inside the device with a switch 6.
05. Further, the power storage device of the present invention can take a connection form of a control converter 604 other than the illustrated configuration and other devices.

According to this configuration, when the electric power required by the load device 603 cannot be supplied by the commercial power supply 601 or the photovoltaic power generation device 602, the electric storage device 101 is controlled via the control converter 604.
To supply power. Then, when the power supply from the commercial power supply 601 or the solar power generation device 602 is excessive, power is stored in the power storage device 101 via the control converter 604.

With these configurations, the contract power and power consumption of the commercial power supply 601 and the power generation rating of the photovoltaic power generator 602 can be reduced, so that equipment costs and running costs can be reduced.

Further, when the power consumption is concentrated in a certain time zone, power is supplied from the power storage device 101 to the commercial power supply 601, and when the power consumption is low, the power is stored in the power storage device, thereby reducing the concentration of the power consumption. In addition, power consumption can be leveled.

Further, the control converter 604 includes a load device 603
Since the power consumption of the power supply is monitored and the load device 603 is controlled, energy saving and effective use of power can be achieved.

Of course, high-frequency power (ripple) is generated in these operations. However, as described above, voltage and current ripples are reduced to improve their detection accuracy and reliability, and to reduce the rise in temperature of the capacitor. It is possible to improve the safety, life, and performance of the power storage device, and realize a light-weight, small, inexpensive, highly reliable, and high-security power storage device. Further, it can be realized even with a large current and a high voltage as in the present embodiment.

[0089]

As described above, according to the present invention, a power storage device with reduced voltage and current ripples can be realized.

Accordingly, the present invention is particularly directed to a storage device such as a lithium secondary battery and an electric double layer capacitor, a storage device in which a large number of storage devices are connected in series, an evaluation device for evaluating these, a manufacturing device for these devices, The present invention is useful for electric devices such as an uninterruptible power supply device and electric storage devices for electric motors such as electric bicycles and electric vehicles.

[Brief description of the drawings]

FIG. 1 is a diagram showing a first embodiment of the present invention.

FIG. 2 is a diagram showing a second embodiment of the present invention.

FIG. 3 is a diagram showing a third embodiment of the present invention.

FIG. 4 is a diagram showing a fourth embodiment of the present invention.

FIG. 5 is a diagram showing a fifth embodiment of the present invention.

FIG. 6 is a diagram showing a sixth embodiment of the present invention.

FIG. 7 is a diagram showing a conventional uninterruptible power supply.

FIG. 8 is a diagram showing characteristics of a discharge time, a voltage across a capacitor terminal, and a discharge current when discharging is performed via a boost chopper circuit.

FIG. 9 is a diagram showing characteristics of a discharge time and a self-temperature rise of a capacitor when discharging through a boost chopper circuit.

FIG. 10 is an enlarged view of the time axis of FIG. 8;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 101 ... Battery, 102 ... Battery control circuit, 103 ... Battery module, 104 ... Inductor, 105 ... Capacitor, 106 ... Chopper type power converter, 301 ... Chopper inductor, 401 ... Current detection circuit, 601 ... Commercial power supply, 602 ... Photovoltaic power generator, 603 ... Load device, 60
4, control converter, 605, switch, 606, AC / DC converter, 701, commercial power supply, 702, AC / DC converter circuit, 703, step-down chopper circuit, 704, storage battery,
705: step-up chopper circuit, 706: DC / AC inverter circuit, 707: load.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Naohiro Nomura 46-1, Tomioka, Nakajo-cho, Kitakanbara-gun, Niigata F-term in Industrial Machinery Division, Hitachi, Ltd. 5G003 AA01 AA06 BA01 BA03 CA01 CC02 DA07 DA16 FA08 GB03 GB06 5G015 FA08 HA03 JA13 JA53 JA55 JA56 JA64 5H730 AA00 AS08 AS17 BB13 BB14 BB57 CC01 DD03 FD01 FD31 FF09

Claims (5)

[Claims] In a power storage device including a power storage module including one or a plurality of power storage devices and a chopper type power converter, an inductor is inserted in series with the power storage module, and the power storage module and the inductor are connected to each other. A power storage device characterized by adding capacitors in parallel with both ends of a series connection part. 2. A power storage device comprising: a power storage module group in which a plurality of power storage modules each including one or more power storage devices are connected in series; and a chopper type power converter.
An energy storage device, comprising: an inductor inserted in series with each of the power storage modules; and capacitors connected in parallel with both ends of a series connection portion of the power storage module and the inductor. 3. A power storage device including a power storage module including one or more power storage devices and a chopper type power converter, wherein the chopper inductor configuring the chopper type power converter includes a plurality of inductors. A rectifier is connected in series, some of the inductors are connected in series, and a rectifier having a polarity opposite to that of the rectifier is connected in parallel to both ends of the inductor and the rectifier connected in series. Power storage device. 4. A power storage device comprising: a power storage module including one or a plurality of power storage units; a chopper type power converter; and a current detection circuit for detecting a current flowing through the power storage module. A plurality of inductors are connected in series, and some of the inductors are connected in series with switch means, and both ends of the inductors and switch means are connected in series. And a switch unit connected in parallel with the switch, and these switch units are switched according to a detection value of the current detection circuit. 5. A power storage device comprising a power storage module comprising one or a plurality of power storages, a chopper type power converter, and a power storage control circuit, wherein said power storage and a capacitor are connected in parallel, and said power storage control circuit Is connected in parallel with the capacitor and the capacitor via an inductor.