JP2001177998A - Protective device and recharging device of module battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve reliability by protecting a module battery by a second protection means for detecting the terminal voltage of the module battery, even if a first protection means for detecting the voltage between the terminals of the secondary battery fails. SOLUTION: In the protection and recharging devices of a module battery 2, where a plurality of secondary batteries 1 are connected in series, the voltage between the terminals of the secondary battery 1 is detected and a signal for stopping the charging/discharging of the module battery 2 is outputted, when the voltage is outside a specific range by a first protection means 5, and the voltage between the terminals of the module battery 2 is detected and a signal for stopping the charging/discharging of the module battery 2 is outputted when the voltage is outside the specific range.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protection device and a power storage device for a module battery, and more particularly to a protection circuit for a module battery formed by connecting a plurality of secondary batteries in series and a power storage device connecting a plurality of module batteries. It is suitable for.

[0002]

2. Description of the Related Art As a conventional protection circuit for a secondary battery, as described in Japanese Patent Application Laid-Open No. 10-150721, overcharge or overdischarge even when the connection point of the intermediate connection point of the secondary battery is disconnected. In order to be able to protect from the terminal voltage, a switch element inserted in series in the charge / discharge circuit of the secondary battery and the terminal voltage of the secondary battery are detected through the battery voltage detection terminal, and the terminal voltage is discharged. An overcharge / discharge prevention circuit that turns off the switching elements when the voltage drops to the prohibition voltage and rises to the charging prohibition voltage, and a secondary battery connected between the battery voltage detection terminal and a higher potential point And a pull-up resistor for setting the battery voltage detection terminal to the same potential state as when the terminal voltage has risen to the charging prohibition voltage when the connection between the intermediate connection point and the battery voltage detection terminal is disconnected. That.

[0003]

However, in the prior art, the protection of the secondary battery in the case where the overcharge protection circuit fails and the voltage of each secondary battery cannot be detected or the signal cannot be output cannot be obtained. Is not listed.

An object of the present invention is to protect the module battery by the second protection means for detecting the terminal voltage of the module battery even if the first protection means for detecting the voltage between the terminals of the secondary battery fails. An object of the present invention is to obtain a highly reliable module battery protection device.

Another object of the present invention is to protect the module battery by the second protection means for detecting the terminal voltage of the module battery even if the first protection means for detecting the terminal voltage of the secondary battery fails. It is another object of the present invention to provide a highly reliable module battery protection device that can protect the first protection means as well as the first protection means.

Another object of the present invention is to protect the module battery by the second protection means for detecting the terminal voltage of the module battery even if the first protection means for detecting the voltage between the terminals of the secondary battery fails. With a simple configuration,
An object is to obtain a highly reliable power storage device capable of protecting an assembled battery.

[0007]

A first feature of the present invention to achieve the above object is a first protection means connected between terminals of a secondary battery and a first protection means connected between terminals of a module battery. Wherein the first protection means detects a voltage between terminals of the secondary battery and outputs a signal for stopping charging / discharging of the module battery when the voltage is out of a predetermined range. The second protection means has a function of detecting a voltage between terminals of the module battery and outputting a signal for stopping charging / discharging of the module battery when the voltage is out of a predetermined range. That is what I did.

A second feature of the present invention resides in that the first protection means and the second protection means are constituted by separate components and are configured to stop charging and discharging of the module battery independently. .

A third feature of the present invention is that a backup power supply is provided for supplying power to the second protection means when power supply from the module battery to the second protection means is cut off.

A fourth feature of the present invention is that the first protection means detects a voltage between the terminals of the secondary battery and stops the charging / discharging of the module battery when the voltage is out of a predetermined range. The second protection means has a function of detecting a voltage between terminals of the module battery and outputting a signal for stopping charging and discharging of the module battery when the voltage is outside a predetermined range. That is, it has a configuration to have.

A fifth feature of the present invention is that an assembled battery is formed by connecting a plurality of module batteries each formed by connecting a plurality of secondary batteries in series, and the first protection means and the second protection means are connected to each other. First and second OR means for taking the logical sum of the output signals and outputting the result are provided, and are opened and closed by the outputs of the first and second OR means. The opening and closing means is configured to be connected in series with the battery pack.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. The same reference numerals in the drawings of the respective embodiments indicate the same or corresponding components.

First, a protection device for a module battery according to a first embodiment of the present invention will be described with reference to FIG.

First, the structure of the module battery protection device of the first embodiment will be described.

The module battery 2 has a plurality of secondary batteries, in this embodiment, four secondary batteries 1 connected in series. This secondary battery is a secondary battery that is charged at a voltage lower than a predetermined low voltage, such as a lithium ion secondary battery. In this embodiment, the secondary battery is a lithium ion secondary battery.

The module battery 2 has a positive terminal connected to a positive terminal 21 serving as an external connection terminal via a first opening / closing means 4a and a second opening / closing means 4b in series, and a negative terminal connected to an external terminal. It is connected to a minus terminal 22 which is a connection terminal.

The protection circuit 3 includes a first protection means 5 for monitoring the voltage of each secondary battery 1, a second protection means 6 for monitoring the voltage of the module battery 2, and a second protection means 6. And a backup power supply circuit 31.

The first protection means 5 is connected to both terminals of each secondary battery 1 and detects a voltage between the secondary batteries 1. Also, the first protection means 5
It is connected to the first opening / closing means 4a and the charge / discharge switching means 10 and outputs a signal to these.

The second protection means 6 is connected to both the input and output terminals of the module battery 2 and
In addition to receiving more power, the terminal voltage of the module battery 2 is detected. The second protection means 6 is connected to the second opening / closing means 4b and the charge / discharge switching means 10 and outputs a signal to these. The first protection means 5 and the second protection means 6 are formed by different components, in other words, by different circuits.

The backup power supply circuit 31 includes a reverse current prevention diode 7, a current limiting resistor 8, and a capacitor 9 connected in series. Both ends of the backup power supply circuit 31 are connected to both ends of the module battery 2 and both ends of the second protection means 6. Specifically, the anode of the backflow prevention diode 7 is connected to the positive terminal of the module battery 2, and the cathode of the backflow prevention diode 7 is connected to the capacitor 9 via the current limiting resistor 8.

One side of the capacitor 9 is connected to the current limiting resistor 8 and the second protection means 6 and the capacitor 9
The other side is connected to the negative terminal of the module battery 2. The capacity of this capacitor 9 is
When the power supply to the second protection means 6 is stopped due to the disconnection of the connection line to the second protection means 6, the operation of the second protection means 6 is continued until the second protection means 6 completes the protection processing. It is set to a predetermined value or more that can be maintained.

The charge / discharge switching means 10 is connected between a plus terminal 21 and a minus terminal 22, which are external connection terminals, and receives power.

Next, the operation of the module battery protection device will be described.

When charging the module battery 2, the first protection means 5 monitors the voltage between the terminals of each secondary battery 1, and when any of the secondary batteries 1 becomes higher than the preset overcharge voltage V1. , Outputs a charging stop output, opens the first opening / closing means 4a to stop charging the module battery 2, and
The charge / discharge switching means 10 is notified.

Upon receiving the charge stop notification, the charge / discharge switching means 10 switches the charge mode to the discharge mode and receives a discharge start instruction from the outside or the voltage between the external connection terminals is equal to or less than the terminal voltage of the module battery 2. , The first opening / closing means 4a and the second opening / closing means 4b are closed to enable discharging.

When the module battery 2 is charged, the second
The protection means 6 monitors the voltage between the terminals of the module battery 2 and outputs a charge stop output when the voltage between the terminals of the module battery 2 becomes equal to or higher than a preset overcharge voltage V2.
The opening / closing means 4b is opened to stop charging the module battery 2, and the charge / discharge switching means 10 is notified.

Upon receiving the charge stop notification, the charge / discharge switching means 10 switches the charge mode to the discharge mode, and receives a discharge start instruction from the outside or the voltage between the external connection terminals is equal to or less than the terminal voltage of the module battery 2. , The first opening / closing means 4a and the second opening / closing means 4b are closed to enable discharging.

In this embodiment, the relationship between the overcharge voltage V1 of the secondary battery 1 and the overcharge voltage V2 of the module battery 2 is set so that V2 ≧ 4 · V1. The first protection means 5 operates preferentially.

Further, when the module battery 2 is discharged,
The first protection means 5 monitors the voltage between the terminals of each secondary battery 1 and determines whether any one of the secondary batteries 1 has a preset overdischarge voltage V
When it becomes 3 or less, a discharge stop output is output, the first opening / closing means 4a is opened to stop the discharge of the module battery 2, and the charge / discharge switching means 10 is notified.

When the module battery 2 is discharged, the second protection means 6 monitors the voltage between the terminals of the module battery 2 and, when the voltage between the terminals of the module battery 2 becomes equal to or higher than the preset overdischarge voltage V4, the discharger. A stop output is issued, the second opening / closing means 4b is opened to stop discharging to the module battery 2, and the charge / discharge switching means 10 is notified.

Upon receiving the notification of the discharge stop from the first protection means 5 or the second protection means 6, the charge / discharge switching means 10 switches the discharge mode to the charge mode and receives a charge start instruction from outside. When the voltage between the external connection terminals rises above the voltage between the terminals of the module battery 2, the first opening / closing means 4a and the second opening / closing means 4b are closed to allow charging.

In this embodiment, the relationship between the overdischarge voltage V3 of the secondary battery 1 and the overdischarge voltage V4 of the module battery 2 is set so that V4 ≦ 4 · V3 and V3> 2V. In the case of overdischarge, the first protection means 5 operates preferentially. Here module battery 2
Is higher than 2 V because the voltage at which the copper of the base material of the negative electrode of each secondary battery 1 starts melting is about 2 V
It is necessary to keep the height higher than that.

As described above, the first protection means 5 stops charging or discharging the module battery 2 when detecting a voltage outside the predetermined range, that is, a voltage not lower than the overcharge voltage V1 or not higher than the overdischarge voltage V3. Output a signal for performing When the second protection means 6 detects a voltage outside the predetermined range, that is, a voltage equal to or higher than the overcharge voltage V2 or equal to or lower than the overdischarge voltage V4, the second protection means 6 outputs a signal for stopping charging or discharging of the module battery 2. I do.

On the other hand, if any one of the lines connecting each secondary battery 1 and the first protection means 5 is broken, or if the voltage detecting section of the first protection means 5 fails, the secondary battery voltage Cannot be detected, the first protection means 5 cannot detect the voltage of the secondary battery corresponding to the disconnection or the failure, and stops charging or discharging even if the secondary battery is overcharged or overdischarged. Stop output is not output. However, since the second protection means 6 is formed as a separate component from the first protection means 5, the connection to the second protection means 6 is not limited to the above-described disconnection, failure, and the like except when the connection line is disconnected. In this case, the voltage between the terminals of the module battery 2 is also increased or decreased. Therefore, even if the first protection means 5 cannot detect the overcharge or overdischarge of the secondary battery, the second protection means 6 detects overcharging or overdischarging of the module battery 2, outputs an output of charging stop or discharging stop, and can stop charging / discharging the module battery 2.

When the connection line to the second protection means 6 is broken, the second protection means 6
Of the module battery 2
Can be detected, the charge / discharge stop output is output by the residual charge of the capacitor 9, the second opening / closing means 4b is opened, and the charge / discharge switching means 10 can be notified.

Further, during the discharge of the module battery 2, for example, if contact failure occurs between the secondary batteries in the module battery 2, the total voltage of the secondary batteries other than the contact failure portion becomes equal to the voltage between the contact failure portions. The voltage may be applied to the secondary battery voltage detecting unit as a reverse voltage at a ratio of an equivalent resistance value to the discharge load, and the voltage detecting unit of the first protection unit 5 may fail. , Only the same forward voltage as the voltage applied to the load is applied, so that the second protection means 6 does not fail. In this case, the voltage applied to the load, that is, the voltage between the terminals of the module battery 2 is out of the predetermined range. The second
The protection means 6 can detect this contact failure, issue a discharge stop output to open the second opening / closing means 4b, and notify the charge / discharge switching means 10.

At this time, although the voltage of the capacitor 9 becomes higher than the voltage between the terminals of the module battery 2, the charge of the capacitor 9 does not flow back to the module battery 2 because the charge is blocked by the backflow prevention diode 7. The second protection means 6 can reliably perform a predetermined protection operation.

In the embodiment of the present invention, there are provided first protection means 5 connected between the terminals of the secondary battery 1 and second protection means 6 connected between the terminals of the module battery 2,
The second protection means 6 detects the voltage between the terminals of the module battery 2 and if the voltage is out of the predetermined range, the module battery 2
Has a function of outputting a signal for stopping charging / discharging of the battery. Therefore, even if the first protection means 5 fails to function due to a failure or the like, the second protection means 6 overcharges with the terminal voltage of the module battery 2. By detecting a voltage outside a predetermined range of overdischarge or overdischarge, the module battery 2 can be protected. As a result, a highly reliable module battery protection device can be provided.

Since the output of the charge / discharge stop signal of the first protection means 5 is performed prior to the output of the charge / discharge stop signal of the second protection means 6, the first protection means is provided. When both the second protection means and the second protection means are normal, reliable protection by detecting the terminal voltage of each secondary battery 1 can be achieved.

Further, the first protection means 5 and the second protection means 6 are formed as separate components and are configured to stop charging / discharging of the module battery 2 independently. Even if the protection means 5, 6 fails, the charging / discharging of the module battery 2 can be reliably stopped by the other protection means, and in this respect, the reliability can be improved.

Further, power is supplied to the second protection means 6 from the module battery 2, and when the power supply from the module battery 2 to the second protection means 6 is cut off, the backup power supply 31 supplies the power to the second protection means 6. Since the power is supplied, the second protection means 6 can be operated by the backup power supply 31 even when the power supply is interrupted, while using the power supply from the module battery in the normal state.
From this point, the reliability can be improved.

Further, the backup power supply 31 is formed by a series circuit of the backflow prevention diode 7 and the capacitor 9, and this capacitor 9 is connected to the second protection means 6 to form the power supply circuit, and the module battery 2 Since the power is supplied from the capacitor 9 to the second protection means 6 when the power supply to the second protection means 6 is cut off, a backup power supply can be configured with a simple configuration, and the power of the module battery 2 can be reduced. Even if contact between the secondary batteries 1 becomes defective during discharge, a reverse voltage can be prevented from being applied to the second protection means 6 by the backflow prevention diode 7, which also increases reliability. Can be expensive.

Next, a second embodiment of the present invention will be described with reference to FIG.

First, the configuration of the module battery protection device and the power storage device of the second embodiment will be described.

There are a plurality of module batteries 2a and 2b,
In this embodiment, the battery comprises two module batteries 2a and 2b. Each of the module batteries 2a and 2b is configured by connecting a plurality of secondary batteries 1a and 1b made of a lithium ion secondary battery in series. Two module batteries 2
a and 2b are connected in series to form an assembled battery.
In this battery pack, the plus side terminal is connected to a plus terminal 21 which is an external connection terminal via the opening / closing means 4 in series,
The negative terminal is connected to a negative terminal 22 which is an external connection terminal.

A plurality of protection circuits 3a and 3b are provided corresponding to each module battery 2, and two protection circuits are provided in this embodiment.

The protection circuits 3a and 3b are connected to the respective secondary batteries 1a,
First protection means 5a, 5b for monitoring the voltage between terminals 1b
A second protection means 6a, 6b for monitoring a voltage between terminals of the module batteries 2a, 2b;
a, 7b, the backup capacitors 9a, 9b of the second protection means 6a, 6b, and the first protection means 5a, 5b
Monitoring means 11a and 11b for monitoring
Monitoring means 1 for monitoring the protection means 6a, 6b
2a and 12b.

The first protection means 5a, 5b are connected to both terminals of the secondary batteries 1a, 1b, respectively, and detect the voltage between the secondary batteries 1a, 1b. The first protection means 5a and 5b are connected to the first monitoring means 1
1a and 11b, and outputs signals to them.

The second protection means 6a, 6b is connected to the module battery 2 via the backflow prevention diodes 7a, 7b.
a, 2b connected to both ends of the module batteries 2a, 2b
It receives more power and detects the voltage between the terminals of the module batteries 2a and 2b. Further, the second protection means 6a, 6b is provided with the second monitoring means 12a, 12b.
b and outputs a signal to this. A first protection means 5a, 5b and a second protection means 6a,
6b is constituted by another component, in other words, by another circuit.

The first monitoring means 11a, 11b is connected to the module battery 2 via the backflow prevention diodes 7a, 7b.
a, 2b connected to both ends of the module batteries 2a, 2b
It is receiving more power. Further, the first monitoring means 1
1a and 11b are connected so as to monitor the second protection means 6a and 6b and notify the first OR means 13.

The second monitoring means 12a, 12b is connected to the module battery 2 via the backflow prevention diodes 7a, 7b.
a, 2b connected to both ends of the module batteries 2a, 2b
It is receiving more power. Further, the second monitoring means 1
2a and 12b are connected so as to receive the outputs of the second protection means 6a and 6b and to notify the second OR means 14.

The backup capacitors 9a and 9b are
The second protection means 6a, 6b, the first monitoring means 11a,
11b and the second monitoring means 12a, 12b, which are connected in parallel so that when power supply from the module batteries 2a, 2b is stopped, power can be supplied to them.
Normally connected to both ends of the module batteries 2a and 2b via the backflow prevention diodes 7a and 7b,
a and 2b.

When the power supply from the module batteries 2a, 2b is stopped, the capacity of the capacitors 7a, 7b is changed by the second protection means 6a, 6b to the second monitoring means 12a, 1b.
The second protection means 6a, 6b and the second monitor means are notified to the second OR means 14 via the second OR means 2b and until the opening / closing means 4 is circuited by the signal from the second OR means 14. The value is set to a value that can maintain the operations of 12a and 12b.

The first logical OR means 13 and the second logical OR means 14 are connected to the opening / closing means 4 and to the charge / discharge switching means 10.

The charging / discharging switching means 10 is connected between a plus terminal 21 and a minus terminal 22, which are external connection terminals, and receives power.

Next, the operation of the module battery protection device and the power storage device will be described.

When one of the secondary batteries 1a, 1b is overcharged or overdischarged, the first protection means 5a,
5b detects the overcharge or overdischarge voltage,
To the first OR means 13 via the monitoring means 11a and 11b.

Upon receiving the notification of the charge or discharge stop, the first OR means 13 outputs a charge stop signal to the opening / closing means 4 and the charge / discharge switching means 10, and the module battery 2
a, Stop charging or discharging to 2b. In this embodiment, as in the case of the first embodiment, the first charging operation is performed at the time of overcharge and overdischarge.
The operating voltage value is set so that the first protection means 5a and 5b operate preferentially, and if the battery voltage detectors of the first protection means 5a and 5b are normal, the first protection means 5
a, 5b operate at the time of overcharge and overdischarge.

When the charge or discharge is stopped by the signal from the first logical sum means 13, the charge / discharge switching means 10 receives the signal input of the discharge or charge instruction from the outside or receives the signal input from the module battery 2a. When 2b stops due to overcharging, it starts discharging when it falls below a predetermined value, and when stopped due to overdischarging, it operates to restart charging when it rises above a predetermined value.

Further, whether any one of the wires connecting each of the secondary batteries 1a, 1b and the first protection means 5a, 5b is disconnected,
Alternatively, when the battery voltage detectors of the first protection means 5a, 5b fail and the secondary battery voltage cannot be detected, the first protection means 5a, 5b causes the secondary battery 2a corresponding to the disconnection or the failure. , 2b cannot be detected, and even if the secondary batteries 2a, 2b are overcharged or overdischarged, no output of charge stop or discharge stop is output. But,
The second protection means 6a, 6b is composed of first protection means 5a, 5
b, the second protection means 6
a, except that the connection line to 6b is disconnected,
At this time, the module battery 2a,
2b also increases or decreases.
Even if the protection means 5a, 5b cannot detect overcharge or overdischarge of the secondary battery, the second protection means 6a, 6b
The overcharge or overdischarge of the module batteries 2a, 2b is detected, and an output for stopping charging or discharging is issued.

The output of the charge stop or the discharge stop is notified to the second OR means 14 through the first monitor means 12a and 12b. Thereby, the second OR means 1
4 opens the opening / closing means 4 to open the module batteries 2a, 2
In addition to stopping the charging or discharging of b, a signal is output to the charge / discharge switching means 10 to stop the operation of the power storage device.

Further, when the connection line to the second protection means 6a, 6b is broken, the second protection means 6a, 6b
Can no longer detect the voltage between the terminals of the module batteries 2a, 2b, but can detect that the voltage between the terminals of the module batteries 2a, 2b has run out, and issue a charge / discharge stop output due to the remaining charge of the capacitors 9a, 9b. The second logical sum means 14 is notified via the first monitor means 12a and 12b. As a result, the second logical sum means 14 is connected to the open / close means 4
To stop charging or discharging the module batteries 2a and 2b, and output a signal to the charge / discharge switching means 10 to stop the operation of the power storage device.

By stopping the operation of the power storage device as described above, the protection circuits 3a and 3b can be inspected and repaired, and the protection circuits 3a and 3b themselves can be maintained.

The charge / discharge switching means 10 is connected to the first monitoring means 11a, 11b and the second monitoring means 11a, 11b in each protection circuit 3a, 3b via the first OR means 13 and the second OR means 14. Monitor means 12a and 12b are periodically monitored, and the first protection means 5a and 5b in each protection circuit 3a and 3b are monitored.
b and the state of the second protection means 6a, 6b are checked, and if overcharge / discharge, etc., the power storage device is immediately stopped and an alarm is issued by an externally connected notification means (not shown). Thus, by providing the monitoring function in the protection circuits 3a and 3b, the state in the protection circuits can be checked at any time.

In the embodiment of the present invention, since the monitoring means 11a and 11b for monitoring the states of the first protection means 5a and 5b and the second protection means 6a and 6b are provided, the first protection means is provided. 5a, 5b and second protection means 6
The conditions of a and 6b can be checked from the outside at any time.

Further, the first OR means 13 which takes the logical sum of the output signals of the first protective means 5a, 5b and the second protective means 6a, 6b and outputs the result, and the second logical OR Means 14 and the opening / closing means 4 that opens and closes by the outputs of the first OR means 13 and the second OR means 14 are connected in series with the assembled battery, so that the protection of the assembled battery can be achieved with a simple configuration. Can be achieved.

[0067]

According to the present invention, the module battery is protected by the second protection means for detecting the terminal voltage of the module battery even if the first protection means for detecting the voltage between the terminals of the secondary battery fails. A highly reliable module battery protection device can be obtained.

Further, even if the first protection means for detecting the voltage between the terminals of the secondary battery fails, the module battery can be protected by the second protection means for detecting the terminal voltage of the module battery. A highly reliable module battery protection device that can also protect the first protection means can be obtained.

Furthermore, even if the first protection means for detecting the terminal voltage of the secondary battery fails, the module battery can be protected by the protection means for detecting the terminal voltage of the module battery, and a simple structure can be achieved. Thus, a highly reliable power storage device capable of protecting the assembled battery can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a protection device for a module battery according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a module battery protection device and a power storage device according to a second embodiment of the present invention.

[Explanation of symbols]

1 ... secondary battery, 2, 2a, 2b ... module battery, 3,
3a, 3b protection circuit, 4 opening / closing means, 4a ... first opening / closing means, 4b ... second opening / closing means, 5, 5a, 5b ... first
Protection means, 6, 6a, 6b ... second protection means, 7, 7
a, 7b: backflow prevention diode, 8, 8a, 8b: current limiting resistor, 9, 9a, 9b: capacitor, 10: charge / discharge switching means, 11a, 11b: first monitor means, 12a, 1
2b: second monitor means, 13: first OR means, 1
4: second OR means, 31: backup power supply circuit.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Michiko Sakairi 800 Tomita, Ohira-cho, Shimotsuga-gun, Tochigi Pref.

Claims (5)

[Claims] 1. A module battery comprising a plurality of secondary batteries connected in series, a first protection means connected between terminals of the secondary batteries, and a second protection device connected between terminals of the module batteries. Wherein the first protection means detects a voltage between terminals of the secondary battery and outputs a signal for stopping charging / discharging of the module battery when the voltage is outside a predetermined range. Wherein the second protection means has a function of detecting a voltage between terminals of the module battery and outputting a signal for stopping charging and discharging of the module battery when the voltage is out of a predetermined range. Characteristic module battery protection device. 2. A module battery comprising a plurality of secondary batteries connected in series, a first protection means connected between terminals of the plurality of secondary batteries, and a terminal between the module batteries. Connected to the first protection means,
Has a function of detecting the voltage between the terminals of the secondary battery and stopping charging and discharging of the module battery when the voltage is out of a predetermined range, the second protection means includes: A function of detecting a voltage between terminals of the module battery and stopping charging and discharging of the module battery when the voltage is out of a predetermined range;
Wherein the protection means comprises separate components and is configured to independently stop charging and discharging of the module battery. 3. A module battery comprising a plurality of secondary batteries connected in series, a first protection means connected between respective terminals of the plurality of secondary batteries, and a terminal between the terminals of the module batteries. A second protection means connected thereto; and a backup power supply for the second protection means, wherein the first protection means detects a voltage between terminals of the secondary battery and adjusts the voltage to a predetermined range. A function of outputting a signal for stopping charging / discharging of the module battery when outside, the second protection unit supplies power from the module battery,
A function of detecting a voltage between terminals of the module battery and outputting a signal for stopping charging / discharging of the module battery when the voltage is out of a predetermined range; and 2. A protection device for a module battery, wherein power is supplied to the second protection means when power supply to the second protection means is interrupted. 4. A module battery comprising a plurality of secondary batteries connected in series, a first protection means connected between respective terminals of said plurality of secondary batteries, and a terminal between said module batteries. A second protection means connected to the first protection means and a monitor means for monitoring states of the first protection means and the second protection means, wherein the first protection means is provided between terminals of the secondary battery. A function of detecting a voltage and outputting a signal for stopping charging / discharging of the module battery when the voltage is outside a predetermined range, wherein the second protection means detects a voltage between terminals of the module battery; And a function of outputting a signal for stopping charging and discharging of the module battery when the voltage is outside a predetermined range. 5. An assembled battery is formed by connecting a plurality of module batteries each formed by connecting a plurality of secondary batteries in series, and each module battery is connected to a first protection means and a second protection means. The first protection means is connected between respective terminals of the plurality of secondary batteries, detects a voltage between the terminals, and stops charging / discharging of the module battery when the voltage is out of a predetermined range. A signal output function, wherein the second protection means is connected between terminals of the module battery, detects a voltage between terminals of the battery, and detects a voltage between the terminals of the module battery when the voltage is out of a predetermined range. A first OR means for outputting a signal for stopping charging / discharging, a logical sum of output signals of the first protection means and the second protection means, and outputting a result thereof; The first OR means and Power storage apparatus characterized by connecting the opening and closing means for opening and closing the output of the second logical sum means to the battery pack in series.