JP2007311255A

JP2007311255A - Battery pack status measuring device, battery pack deterioration determining method, and battery pack deterioration determining program

Info

Publication number: JP2007311255A
Application number: JP2006140587A
Authority: JP
Inventors: Ken Aoyama; 謙青山; Hiroshi Yamamoto; 宏志山本; Toshiaki Yabumoto; 俊昭薮本; Hitoshi Shishido; 仁宍戸
Original assignee: Furukawa Battery Co Ltd; Fuji Electric Systems Co Ltd; Toyota Motor Corp
Current assignee: Fuji Electric Co Ltd; Furukawa Battery Co Ltd; Toyota Motor Corp
Priority date: 2006-05-19
Filing date: 2006-05-19
Publication date: 2007-11-29

Abstract

<P>PROBLEM TO BE SOLVED: To easily determine deterioration of a battery pack while securing determination precision of deterioration of the battery pack used as an emergency power supply facility. <P>SOLUTION: As for a battery pack status measuring device 7, voltages of respective unit batteries constituting the battery pack 3 are periodically measured at every prescribed time after detecting discharging of the battery pack 3, the maximum voltage and the minimum voltage are detected of the respective unit batteries in the battery pack 3 in the discharging at the same time, and the deterioration state of the battery pack 3 is determined based on differential between the maximum voltage and the minimum voltage of the respective unit batteries. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は組電池状態測定装置、組電池劣化判定方法および組電池劣化判定プログラムに関し、特に、非常用電源設備として用いられる組電池の劣化判定方法に適用して好適なものである。 The present invention relates to an assembled battery state measurement device, an assembled battery deterioration determination method, and an assembled battery deterioration determination program, and is particularly suitable for application to an assembled battery deterioration determination method used as an emergency power supply facility.

鉛蓄電池は単位電池（セル）当たりの起電力が制限されることから所定の電圧が得られるように、例えば、２４セルや４８セル分の単位電池を組電池として構成して運用することが一般的に行われている。また、必要な容量が得られるようにするために、単位電池を並列に接続して用いられることもある。すなわち、組電池は、用途に応じた容量および電圧を確保するために、複数の単位電池を直並列に接続して構成される。 Since lead-acid batteries are limited in electromotive force per unit battery (cell), for example, unit batteries for 24 cells or 48 cells are generally configured and operated as an assembled battery so that a predetermined voltage can be obtained. Has been done. In order to obtain a required capacity, unit batteries may be connected in parallel and used. That is, the assembled battery is configured by connecting a plurality of unit batteries in series and parallel in order to ensure a capacity and voltage according to the application.

その際、鉛蓄電池には寿命があることから組電池にも寿命があり、組電池の経済性および信頼性の面から組電池の寿命を正確に判定し、組電池の交換時期を的確に把握できるようにする方法が望まれている。
組電池の劣化形態としては、組電池全体でほぼ均一に劣化が進行する場合もあるが、組電池を構成する一部の単位電池の劣化に起因する場合もある。組電池を構成する一部の単位電池の劣化の原因としては、組電池を構成する単位電池間の製造バラツキに起因する初期からの特性差、あるいは運用中の温度差などの環境条件に起因する劣化の進行の違いなどが考えられる。さらに、この組電池を構成する単位電池間の劣化のバラツキは運用時間の延長とともに拡大していく。 At that time, since the lead-acid battery has a lifetime, the assembled battery also has a lifetime. From the viewpoint of the economic and reliability of the assembled battery, the life of the assembled battery is accurately determined, and the replacement time of the assembled battery is accurately grasped. There is a need for a way to make it possible.
As a deterioration mode of the assembled battery, there are cases where the deterioration progresses almost uniformly in the entire assembled battery, but there are also cases where it is caused by deterioration of some unit cells constituting the assembled battery. The cause of deterioration of some unit cells constituting the assembled battery is caused by environmental characteristics such as a difference in characteristics from the initial stage due to manufacturing variation among the unit cells constituting the assembled battery, or a temperature difference during operation. Differences in the progress of deterioration can be considered. Furthermore, the variation in deterioration among the unit batteries constituting the assembled battery increases as the operation time is extended.

そして、組電池として運用される際には、これらの単位電池の特性の低下が組電池としての特性の低下を引き起こす。特に、劣化が進行した単位電池があると、その単位電池の放電時の電圧の低下が激しくなり、組電池の総電圧の低下を加速し、組電池に対する性能の要求を果たせなくなることから、組電池としての放電時間の短縮を招くようになる。
ここで、例えば、特許文献１には、車両走行時などの組電池の通常の使用中に組電池を構成する単位電池の異常を検出できるようにするため、所定電力放電時の電圧変化を測定し、この時の放電挙動を調べることにより、セルの異常を診断する方法が開示されている。 And when it operates as an assembled battery, the fall of the characteristic of these unit batteries causes the fall of the characteristic as an assembled battery. In particular, if there is a unit battery that has deteriorated, the voltage drop at the time of discharge of the unit battery becomes severe, accelerating the decrease in the total voltage of the battery pack, and cannot meet the performance requirements for the battery pack. The discharge time as a battery is shortened.
Here, for example, in Patent Document 1, a voltage change at the time of discharging a predetermined power is measured in order to be able to detect an abnormality of a unit battery constituting the assembled battery during normal use of the assembled battery such as when the vehicle is running. A method for diagnosing cell abnormality by examining the discharge behavior at this time is disclosed.

また、例えば、特許文献２には、鉛蓄電池の劣化状態の検知や容量の推定を精度よく行えるようにするために、１〜１０００Ｈｚのいずれかの周波数の交流電源にて鉛蓄電池の交流インピーダンスを測定する方法が開示されている。
また、例えば、特許文献３には、多数セルからなる組電池の１セルごとの電圧を計測し、計測した電圧の最大値と最小値の差分を所定値と比較することで、鉛蓄電池の寿命を判定する方法が開示されている。
特許第３５５９９００号公報特開平５−２８１３１０号公報実開昭５９−１５８２７６号公報 Further, for example, in Patent Document 2, in order to accurately detect the deterioration state of the lead storage battery and estimate the capacity, the AC impedance of the lead storage battery is set with an AC power source having a frequency of 1 to 1000 Hz. A method of measuring is disclosed.
In addition, for example, in Patent Document 3, the voltage of each cell of an assembled battery composed of a large number of cells is measured, and the difference between the maximum value and the minimum value of the measured voltage is compared with a predetermined value, whereby the life of the lead storage battery is determined. A method of determining is disclosed.
Japanese Patent No. 3559900 JP-A-5-281310 Japanese Utility Model Publication No.59-158276

しかしながら、特許文献１に開示された方法では、電気自動車のように頻繁に充放電を繰り返すような用途に用いられるため、個々の単位電池の挙動を解析するための処理が煩雑化し、処理に時間を要するとともに装置が複雑化し、非常用電源設備のように定常時充電状態であるような組電池の劣化判定方法には適さないという問題があった。
また、特許文献２に開示された方法では、頻繁に充放電を繰り返すような運用条件では、鉛蓄電池の交流インピーダンスの変化が小さく、組電池の劣化を精度よく判定することができないという問題があった。特に、鉄道用非常用電源などのように計画的に停電が頻繁に繰り返されるような用途には組電池の劣化を正確に判定することができなかった。 However, since the method disclosed in Patent Document 1 is used for applications where charging and discharging are frequently repeated as in an electric vehicle, the processing for analyzing the behavior of individual unit cells becomes complicated, and the processing takes time. In addition, there is a problem that the apparatus becomes complicated and is not suitable for a method for determining deterioration of an assembled battery that is in a steady state charging state as in an emergency power supply facility.
In addition, the method disclosed in Patent Document 2 has a problem in that the change in the AC impedance of the lead storage battery is small and the deterioration of the assembled battery cannot be accurately determined under operating conditions in which charging and discharging are frequently repeated. It was. In particular, it has not been possible to accurately determine the deterioration of the assembled battery in applications where power outages are frequently repeated systematically such as emergency power supplies for railways.

また、特許文献３に開示された方法では、１セルごとの電圧の測定時に鉛蓄電池が充電器から常に充電されるとともに、鉛蓄電池を放電させることなく１セルごとの電圧の測定が行われる。このため、単位電池に異常がある場合においても、個々の単位電池の電圧が充電器の出力電圧によって規定され、個々の単位電池の電圧異常を精度よく検出することができなくなることから、組電池の劣化を精度よく判定することができないという問題があった。
そこで、本発明の目的は、非常用電源設備として用いられる組電池の劣化の判定精度を確保しつつ、組電池の劣化を簡易に判定することが可能な組電池状態測定装置、組電池劣化判定方法および組電池劣化判定プログラムを提供することである。 In the method disclosed in Patent Document 3, the lead storage battery is always charged from the charger when measuring the voltage for each cell, and the voltage for each cell is measured without discharging the lead storage battery. For this reason, even when there is an abnormality in the unit battery, the voltage of each unit battery is defined by the output voltage of the charger, and the voltage abnormality of each unit battery cannot be accurately detected. There has been a problem that it is impossible to accurately determine the deterioration of the material.
Accordingly, an object of the present invention is to provide an assembled battery state measuring device and an assembled battery deterioration determination that can easily determine deterioration of the assembled battery while ensuring the accuracy of determining deterioration of the assembled battery used as an emergency power supply facility. A method and a battery pack deterioration determination program are provided.

上述した課題を解決するために、請求項１記載の組電池状態測定装置によれば、非常用電源設備として用いられる組電池を構成する各単位電池の放電時の電圧の最大値と最小値を検出する最大値／最小値検出手段と、前記単位電池の電圧の最大値と最小値との差分を算出する差分算出手段と、前記単位電池の電圧の最大値と最小値との差分をしきい値と比較する比較手段と、前記比較手段による比較結果に基づいて前記組電池の劣化状態を判定する組電池状態判定手段とを備えることを特徴とする。 In order to solve the above-described problem, according to the assembled battery state measuring apparatus according to claim 1, the maximum value and the minimum value of the voltage at the time of discharging of each unit battery constituting the assembled battery used as an emergency power supply facility are obtained. A threshold value for detecting a maximum value / minimum value detection unit; a difference calculating unit for calculating a difference between a maximum value and a minimum value of the voltage of the unit battery; and a difference between the maximum value and the minimum value of the voltage of the unit battery. Comparing means for comparing with a value, and an assembled battery state determining means for determining a deterioration state of the assembled battery based on a comparison result by the comparing means.

これにより、充電器の出力電圧の影響を受けることなく、各単位電池の放電時の電圧を検出することが可能となり、個々の単位電池の電圧異常を精度よく検出することが可能となるとともに、単位電池の電圧の最大値と最小値との差分を算出することで、非常用電源設備として用いられる組電池の劣化を判定することが可能となる。このため、非常用電源設備として用いられる組電池の劣化の判定精度を確保しつつ、組電池の劣化を簡易に判定することが可能となり、装置構成の簡略化を図りつつ、非常用電源設備のように定常時充電状態であるような組電池の劣化判定を有効に行うことが可能となる。 Thereby, it becomes possible to detect the voltage at the time of discharge of each unit battery without being affected by the output voltage of the charger, and it is possible to accurately detect the voltage abnormality of each unit battery, By calculating the difference between the maximum value and the minimum value of the voltage of the unit battery, it is possible to determine the deterioration of the assembled battery used as an emergency power supply facility. For this reason, it is possible to easily determine the deterioration of the assembled battery while ensuring the accuracy of determining the deterioration of the assembled battery used as the emergency power supply facility. As described above, it is possible to effectively perform the deterioration determination of the assembled battery which is in the steady state charging state.

また、請求項２記載の組電池劣化判定方法によれば、非常用電源設備として用いられる組電池を負荷に接続したまま前記組電池と充電器とを電気的に遮断するステップと、前記充電器と電気的に遮断された状態で前記組電池を構成する各単位電池の放電時の電圧の最大値と最小値を検出するステップと、前記単位電池の電圧の最大値と最小値との差分を算出するステップと、前記単位電池の電圧の最大値と最小値との差分をしきい値と比較するステップと、前記比較手段による比較結果に基づいて前記組電池の劣化状態を判定するステップとを備えることを特徴とする。 Further, according to the assembled battery deterioration judging method according to claim 2, the step of electrically disconnecting the assembled battery and the charger while the assembled battery used as an emergency power supply facility is connected to a load; and the charger A step of detecting a maximum value and a minimum value of a voltage at the time of discharging of each unit battery constituting the assembled battery in an electrically disconnected state, and a difference between the maximum value and the minimum value of the voltage of the unit battery. A step of calculating, a step of comparing a difference between a maximum value and a minimum value of the voltage of the unit battery with a threshold value, and a step of determining a deterioration state of the assembled battery based on a comparison result by the comparison unit. It is characterized by providing.

これにより、組電池を負荷に接続したまま各単位電池の電圧を計測することが可能となり、組電池の実際の運用時における各単位電池の放電時の電圧を検出することが可能となるとともに、充電器の出力電圧の影響を受けることなく、各単位電池の放電時の電圧を検出することが可能となる。このため、個々の単位電池の電圧異常を精度よく検出することが可能となるとともに、単位電池の電圧の最大値と最小値との差分を算出することで、非常用電源設備として用いられる組電池の劣化を判定することが可能となり、非常用電源設備として用いられる組電池の劣化の判定精度を確保しつつ、組電池の劣化を簡易に判定することが可能となる。 Thereby, it becomes possible to measure the voltage of each unit battery while the assembled battery is connected to the load, and it becomes possible to detect the voltage at the time of discharging each unit battery during the actual operation of the assembled battery, It is possible to detect the voltage when each unit battery is discharged without being affected by the output voltage of the charger. For this reason, it is possible to detect an abnormal voltage of each unit battery with high accuracy, and by calculating the difference between the maximum value and the minimum value of the voltage of the unit battery, the assembled battery used as an emergency power supply facility The deterioration of the assembled battery can be easily determined while ensuring the determination accuracy of the deterioration of the assembled battery used as an emergency power supply facility.

また、請求項３記載の組電池劣化判定方法によれば、前記組電池の劣化状態の判定基準となるしきい値を設備運転条件から設定することを特徴とする。
これにより、組電池の放電時間や負荷電流などに応じて組電池の劣化状態を判定することが可能となり、設備容量や運転条件に合わせながら組電池の交換時期を柔軟に設定することが可能となる。 Further, according to the assembled battery deterioration determining method according to claim 3, a threshold value that is a criterion for determining the deterioration state of the assembled battery is set from facility operating conditions.
This makes it possible to determine the deterioration state of the assembled battery according to the discharge time and load current of the assembled battery, and to flexibly set the replacement time of the assembled battery according to the equipment capacity and operating conditions. Become.

また、請求項４記載の組電池劣化判定方法によれば、前記最大値と最小値との差分がしきい値より大きな値を有する単位電池の個数に基づいて前記組電池の健全性を判定することを特徴とする。
これにより、組電池の劣化が組電池全体の平均的な劣化に起因するものであるのか、組電池を構成する個々の単位電池の劣化に起因するものであるのかを判断することができ、単位電池の部分交換や全数交換などの対策を決定する際の判断材料とすることが可能となる。 According to the assembled battery deterioration determining method according to claim 4, the soundness of the assembled battery is determined based on the number of unit cells in which the difference between the maximum value and the minimum value is larger than a threshold value. It is characterized by that.
This makes it possible to determine whether the deterioration of the assembled battery is due to the average deterioration of the entire assembled battery or the deterioration of the individual unit batteries constituting the assembled battery. It can be used as a judgment material when determining measures such as partial replacement or total replacement of batteries.

また、請求項５記載の組電池劣化判定プログラムによれば、非常用電源設備として用いられる組電池を負荷に接続したまま前記組電池と充電器とを電気的に遮断させるステップと、前記充電器と電気的に遮断された状態で前記組電池を構成する各単位電池の放電時の電圧の最大値と最小値を検出するステップと、前記単位電池の電圧の最大値と最小値との差分を算出するステップと、前記単位電池の電圧の最大値と最小値との差分をしきい値と比較するステップと、前記比較手段による比較結果に基づいて前記組電池の劣化状態を判定するステップとをコンピュータに実行させることを特徴とする。 In addition, according to the assembled battery deterioration determination program according to claim 5, the step of electrically disconnecting the assembled battery and the charger while the assembled battery used as an emergency power supply facility is connected to a load; and the charger A step of detecting a maximum value and a minimum value of a voltage at the time of discharging of each unit battery constituting the assembled battery in an electrically disconnected state, and a difference between the maximum value and the minimum value of the voltage of the unit battery. A step of calculating, a step of comparing a difference between a maximum value and a minimum value of the voltage of the unit battery with a threshold value, and a step of determining a deterioration state of the assembled battery based on a comparison result by the comparison unit. The computer is executed.

これにより、組電池劣化判定プログラムをコンピュータに実行させることで、非常用電源設備として用いられる組電池の劣化の判定精度を確保しつつ、組電池の劣化を簡易に判定することが可能となる。このため、非常用電源設備が長期に渡って運用される場合においても、ハードウェア構成の簡略化を図りつつ、非常用電源設備のように定常時充電状態であるような組電池の劣化判定を有効に行うことが可能となる。 Accordingly, by causing the computer to execute the assembled battery deterioration determination program, it is possible to easily determine the deterioration of the assembled battery while ensuring the determination accuracy of the deterioration of the assembled battery used as the emergency power supply facility. For this reason, even when the emergency power supply equipment is operated for a long period of time, it is possible to determine the deterioration of the assembled battery that is in a steady state charging state like the emergency power supply equipment while simplifying the hardware configuration. It becomes possible to carry out effectively.

以上説明したように、本発明によれば、充電器の出力電圧の影響を受けることなく、各単位電池の放電時の電圧を検出することが可能となり、個々の単位電池の電圧異常を精度よく検出することが可能となるとともに、単位電池の電圧の最大値と最小値との差分を算出することで、非常用電源設備として用いられる組電池の劣化を判定することが可能となり、非常用電源設備として用いられる組電池の劣化の判定精度を確保しつつ、組電池の劣化を簡易に判定することが可能となる。 As described above, according to the present invention, it becomes possible to detect the voltage at the time of discharging each unit battery without being affected by the output voltage of the charger, and to accurately detect the voltage abnormality of each unit battery. It is possible to detect the deterioration of the assembled battery used as an emergency power supply facility by calculating the difference between the maximum value and the minimum value of the unit battery voltage. It is possible to easily determine the deterioration of the assembled battery while ensuring the accuracy of determining the deterioration of the assembled battery used as equipment.

以下、本発明の実施形態に係る組電池状態測定装置および組電池劣化判定方法について図面を参照しながら説明する。
図１は、本発明の一実施形態に係る組電池状態測定装置が用いられる組電池のシステムの概略構成を示すブロック図である。
図１において、電力系統１は、１００Ｖまたは２００Ｖの交流電圧を供給することができる。また、充電器２は、組電池３の充電時に組電池３に接続され、電力系統１から供給される交流電圧を直流電圧に変換してから組電池３に出力することができる。また、組電池３は、インバータ４を介して交流負荷５に接続されるとともに、直流負荷６に直接接続される。なお、組電池３は、鉄道用非常用電源などのように計画的に停電が頻繁に繰り返されるような非常用電源設備として用いることができる。 Hereinafter, an assembled battery state measurement device and an assembled battery deterioration determination method according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing a schematic configuration of an assembled battery system in which an assembled battery state measuring apparatus according to an embodiment of the present invention is used.
In FIG. 1, the power system 1 can supply an AC voltage of 100V or 200V. The charger 2 is connected to the assembled battery 3 when the assembled battery 3 is charged, and can convert the AC voltage supplied from the power system 1 into a DC voltage and output it to the assembled battery 3. The assembled battery 3 is connected to the AC load 5 via the inverter 4 and is directly connected to the DC load 6. In addition, the assembled battery 3 can be used as an emergency power supply facility in which power failures are frequently repeated in a planned manner such as an emergency power supply for railways.

ここで、組電池３は、組電池３の劣化状態を判定する組電池状態測定装置７に常時接続されている。そして、組電池状態測定装置７は、組電池３の放電検出後に組電池３を構成する各単位電池の電圧を所定時間ごとに周期的に計測し、放電時の組電池３の中の各単位電池の同時刻における最大電圧と最小電圧を検出することができる。そして、各単位電池の最大電圧と最小電圧との差分に基づいて組電池３の劣化状態を判定することができる。なお、組電池３の放電の検出方法としては、組電池３の電圧が設定値になったかどうかを検出する方法、あるいは放電電流を検出する方法などがある。 Here, the assembled battery 3 is always connected to the assembled battery state measuring device 7 that determines the deterioration state of the assembled battery 3. The assembled battery state measuring device 7 periodically measures the voltage of each unit battery constituting the assembled battery 3 after detecting the discharge of the assembled battery 3 every predetermined time, and each unit in the assembled battery 3 at the time of discharging The maximum voltage and the minimum voltage of the battery at the same time can be detected. And the deterioration state of the assembled battery 3 can be determined based on the difference between the maximum voltage and the minimum voltage of each unit battery. In addition, as a detection method of the discharge of the assembled battery 3, there are a method of detecting whether the voltage of the assembled battery 3 has reached a set value, a method of detecting a discharge current, or the like.

図２は、図１の組電池状態測定装置７の概略構成を示すブロック図である。
図２において、組電池３には、単位電池３ａ〜３ｃ・・・が設けられている。ここで、単位電池３ａ〜３ｃ・・・は、組電池３の用途に応じた容量および電圧を確保するために、例えば、２４セルや４８セル分の単位電池３ａ〜３ｃ・・・を直並列に接続して構成することができる。 FIG. 2 is a block diagram showing a schematic configuration of the assembled battery state measurement device 7 of FIG.
2, the assembled battery 3 is provided with unit batteries 3a to 3c. Here, unit batteries 3a to 3c... Are, for example, unit cells 3a to 3c... For 24 cells or 48 cells in series and parallel in order to ensure the capacity and voltage according to the use of the assembled battery 3. It can be configured by connecting to.

一方、組電池状態測定装置７には、組電池３を構成する各単位電池３ａ〜３ｃ・・・の放電時の電圧を計測する電圧計Ｖａ、Ｖｂ・・・が設けられるとともに、各単位電池３ａ〜３ｃ・・・の放電時の電圧を収集するデータ収集部１１、データ収集部１１にて収集された電圧を記憶する内部メモリ１２および各単位電池３ａ〜３ｃ・・・の放電時の電圧の計測結果に基づいて組電池３の劣化状態を判定する演算機能１３が設けられている。 On the other hand, the assembled battery state measuring device 7 is provided with voltmeters Va, Vb,... For measuring voltages at the time of discharging of the unit batteries 3 a to 3 c. The data collection unit 11 that collects the voltage at the time of discharge of 3a to 3c, the internal memory 12 that stores the voltage collected by the data collection unit 11, and the voltage at the time of discharge of each unit battery 3a to 3c. An arithmetic function 13 for determining the deterioration state of the assembled battery 3 based on the measurement result is provided.

ここで、演算機能１３には、組電池３を構成する各単位電池３ａ〜３ｃ・・・の放電時の電圧の最大値と最小値を検出する最大値／最小値算出手段１３ａ、単位電池３ａ〜３ｃ・・・の電圧の最大値と最小値との差分を算出する差分算出手段１３ｂ、単位電池３ａ〜３ｃ・・・の電圧の最大値と最小値との差分をしきい値と比較する比較手段１３ｃおよび比較手段１３ｃによる比較結果に基づいて組電池３の劣化状態を判定する組電池状態判定手段１３ｄが設けられている。 Here, the calculation function 13 includes a maximum value / minimum value calculating means 13a for detecting the maximum value and the minimum value of the voltage of each unit battery 3a to 3c... Constituting the assembled battery 3, and the unit battery 3a. The difference calculation means 13b for calculating the difference between the maximum value and the minimum value of the voltages of .about.3c..., And the difference between the maximum value and the minimum value of the voltages of the unit batteries 3a to 3c. An assembled battery state determination unit 13d that determines a deterioration state of the assembled battery 3 based on the comparison result by the comparison unit 13c and the comparison unit 13c is provided.

そして、図１の電力系統１が正常に稼動している場合には、図１の交流負荷５または直流負荷６には電力系統１から電力が供給され、交流負荷５または直流負荷６の作動が行われる。そして、電力系統１が停電状態になると、組電池３と充電器２とが電気的に遮断されるとともに、交流負荷５または直流負荷６には組電池３から電力が供給されながら、交流負荷５または直流負荷６の作動が行われる。 When the power system 1 in FIG. 1 is operating normally, power is supplied from the power system 1 to the AC load 5 or the DC load 6 in FIG. Done. When the power system 1 is in a power failure state, the assembled battery 3 and the charger 2 are electrically disconnected, and the AC load 5 or the DC load 6 is supplied with power from the assembled battery 3 while the AC load 5 is being supplied. Alternatively, the operation of the DC load 6 is performed.

そして、組電池状態測定装置７は組電池３の放電を検出すると、データ収集部１１は、各単位電池３ａ〜３ｃ・・・の放電時の電圧を電圧計Ｖａ、Ｖｂ・・・を介して収集し、内部メモリ１２に記憶する。そして、データ収集部１１にて収集されたデータが内部メモリ１２に記憶されると、各単位電池３ａ〜３ｃ・・・の放電時の電圧の最大値と最小値が最大値／最小値算出手段１３ａにて検出される。そして、各単位電池３ａ〜３ｃ・・・の放電時の電圧の最大値と最小値が検出されると、単位電池３ａ〜３ｃ・・・の電圧の最大値と最小値との差分が差分算出手段１３ｂにて算出される。そして、単位電池３ａ〜３ｃ・・・の電圧の最大値と最小値との差分が差分算出手段１３ｂにて算出されると、単位電池３ａ〜３ｃ・・・の電圧の最大値と最小値との差分が比較手段１３ｃにしきい値と比較され、組電池状態判定手段１３ｄは、比較手段１３ｃにおける比較結果に基づいて組電池３の劣化状態を判定する。 When the assembled battery state measuring device 7 detects the discharge of the assembled battery 3, the data collecting unit 11 outputs the voltage at the time of discharging the unit batteries 3a to 3c... Via the voltmeters Va, Vb. Collected and stored in the internal memory 12. When the data collected by the data collecting unit 11 is stored in the internal memory 12, the maximum value and the minimum value of the voltages at the time of discharging the unit batteries 3a to 3c. It is detected at 13a. When the maximum value and the minimum value of the voltage at the time of discharge of each unit battery 3a to 3c... Are detected, the difference between the maximum value and the minimum value of the voltage of the unit batteries 3a to 3c. Calculated by means 13b. When the difference between the maximum value and the minimum value of the voltages of the unit batteries 3a to 3c... Is calculated by the difference calculation means 13b, the maximum value and the minimum value of the voltages of the unit batteries 3a to 3c. Is compared with the threshold value by the comparison means 13c, and the assembled battery state determination means 13d determines the deterioration state of the assembled battery 3 based on the comparison result in the comparison means 13c.

これにより、充電器２の出力電圧の影響を受けることなく、各単位電池３ａ〜３ｃ・・・の放電時の電圧を検出することが可能となり、個々の単位電池３ａ〜３ｃ・・・の電圧異常を精度よく検出することが可能となるとともに、単位電池３ａ〜３ｃ・・・の電圧の最大値と最小値との差分を算出することで、非常用電源設備として用いられる組電池３の劣化を判定することが可能となる。このため、非常用電源設備として用いられる組電池３の劣化の判定精度を確保しつつ、組電池３の劣化を簡易に判定することが可能となり、装置構成の簡略化を図りつつ、非常用電源設備のように定常時充電状態であるような組電池３の劣化判定を有効に行うことが可能となる。 Thereby, it becomes possible to detect the voltage at the time of discharge of each unit battery 3a-3c ..., without being influenced by the output voltage of the charger 2, and the voltage of each unit battery 3a-3c ... Abnormality can be detected with high accuracy, and the difference between the maximum value and the minimum value of the voltages of the unit batteries 3a to 3c... Is calculated, thereby deteriorating the assembled battery 3 used as an emergency power supply facility. Can be determined. For this reason, it is possible to easily determine the deterioration of the assembled battery 3 while ensuring the accuracy of determining the deterioration of the assembled battery 3 used as an emergency power supply facility. It is possible to effectively perform the deterioration determination of the assembled battery 3 that is in a steady state charging state like equipment.

なお、最大値／最小値算出手段１３ａ、差分算出手段１３ｂ、比較手段１３ｃおよび組電池状態判定手段１３ｄは、これらのブロックで行われる処理を遂行させる命令が記述されたプログラムをコンピュータに実行させることにより実現することができる。
そして、このプログラムをＣＤ−ＲＯＭなどの記憶媒体に記憶しておけば、コンピュータに記憶媒体を装着し、そのプログラムをコンピュータにインストールすることにより、最大値／最小値算出手段１３ａ、差分算出手段１３ｂ、比較手段１３ｃおよび組電池状態判定手段１３ｄで行われる処理を実現することができる。また、このプログラムをインターネットやＬＡＮなどの通信網を介してダウンロードすることにより、このプログラムを容易に普及させることができる。 The maximum value / minimum value calculation means 13a, difference calculation means 13b, comparison means 13c, and assembled battery state determination means 13d cause a computer to execute a program in which an instruction for performing processing performed in these blocks is described. Can be realized.
If this program is stored in a storage medium such as a CD-ROM, the maximum / minimum value calculation means 13a and difference calculation means 13b are installed by installing the storage medium in the computer and installing the program in the computer. The processing performed by the comparison unit 13c and the assembled battery state determination unit 13d can be realized. Moreover, this program can be easily spread by downloading this program via a communication network such as the Internet or a LAN.

また、最大値／最小値算出手段１３ａ、差分算出手段１３ｂ、比較手段１３ｃおよび組電池状態判定手段１３ｄで行われる処理を遂行させる命令が記述されたプログラムをコンピュータに実行させる場合、スタンドアロン型コンピュータで実行させるようにしてもよく、ネットワークに接続された複数のコンピュータに分散処理させるようにしてもよい。 Further, when the computer executes a program in which an instruction for performing the processing performed by the maximum value / minimum value calculating means 13a, the difference calculating means 13b, the comparing means 13c, and the assembled battery state determining means 13d is executed by a stand-alone computer. It may be executed, or may be distributed to a plurality of computers connected to the network.

図３は、図１の組電池状態測定装置の組電池劣化判定方法を示す図である。
図３において、組電池３の放電開始後の放電時間Ｔの経過に伴って、組電池３を構成する各単位電池３ａ〜３ｃ・・・間の電圧のバラツキ幅が拡大することが知られている。このため、各単位電池３ａ〜３ｃ・・・間の電圧のバラツキ幅を比較することにより、組電池３の劣化状態を判定することができる。なお、各単位電池３ａ〜３ｃ・・・間の電圧のバラツキ幅の許容値は、組電池３を構成する単位電池３ａ〜３ｃ・・・の数や種類や容量などによって決定されるため、非常用電源設備に固有と値となる。 FIG. 3 is a diagram illustrating an assembled battery deterioration determination method of the assembled battery state measurement device of FIG.
In FIG. 3, it is known that the variation width of the voltage between the unit cells 3 a to 3 c... Constituting the assembled battery 3 increases as the discharge time T after the discharge of the assembled battery 3 starts. Yes. For this reason, the deterioration state of the assembled battery 3 can be determined by comparing the variation width of the voltage between each unit battery 3a-3c .... In addition, since the allowable value of the voltage variation width between the unit batteries 3a to 3c... Is determined by the number, type, capacity, etc. of the unit batteries 3a to 3c. It is a value that is specific to the power supply facility for the vehicle.

具体的には、図２のデータ収集部１１は、組電池３の放電検出後に所定時間ごとに組電池３を構成する各単位電池３ａ〜３ｃ・・・のセル電圧Ｖを周期的に収集し、最大値／最小値算出手段１３ａは、放電時の組電池３の中の各単位電池３ａ〜３ｃ・・・の設定時刻Ｔ１における最大電圧Ｖｍａｘと最小電圧Ｖｍｉｎを検出する。そして、差分算出手段１３ｂは、各単位電池３ａ〜３ｃ・・・の最大電圧Ｖｍａｘと最小電圧Ｖｍｉｎとの差分ΔＶｎ＝（Ｖｍａｘ−Ｖｍｉｎ）を算出し、比較手段１３ｃは、最大電圧Ｖｍａｘと最小電圧Ｖｍｉｎとの差分ΔＶｎをしきい値Ｖｓと比較する。そして、組電池状態判定手段１３ｄは、ΔＶｎ＞Ｖｓの関係をみたす場合、組電池３が劣化していると判定し、ΔＶｎ≦の関係をみたす場合、組電池３は正常であると判定することができる。 Specifically, the data collection unit 11 in FIG. 2 periodically collects the cell voltages V of the unit batteries 3a to 3c... Constituting the assembled battery 3 every predetermined time after the discharge of the assembled battery 3 is detected. The maximum value / minimum value calculation means 13a detects the maximum voltage Vmax and the minimum voltage Vmin at the set time T1 of each of the unit batteries 3a to 3c. Then, the difference calculation means 13b calculates a difference ΔVn = (Vmax−Vmin) between the maximum voltage Vmax and the minimum voltage Vmin of each unit battery 3a to 3c... And the comparison means 13c calculates the maximum voltage Vmax and the minimum voltage. The difference ΔVn from Vmin is compared with the threshold value Vs. Then, the assembled battery state determination unit 13d determines that the assembled battery 3 is deteriorated when the relationship ΔVn> Vs is satisfied, and determines that the assembled battery 3 is normal when the relationship ΔVn ≦ is satisfied. Can do.

また、組電池状態判定手段１３ｄは、最大値と最小値との差分ΔＶがしきい値より大きな値を有する単位電池３ａ〜３ｃ・・・の個数に基づいて組電池３の健全性を判定することができ、差分ΔＶがしきい値より大きな値を有する単位電池３ａ〜３ｃ・・・の個数の全体に占める割合が所定値以上になった場合、組電池３全体が劣化していると判定することもできる。これにより、組電池３の劣化が組電池３全体の平均的な劣化に起因するものであるのか、組電池３を構成する個々の単位電池３ａ〜３ｃ・・・の劣化に起因するものであるのかを判断することができ、単位電池３ａ〜３ｃ・・・の部分交換や全数交換などの対策を決定する際の判断材料とすることが可能となる。
なお、組電池３の劣化状態の判定基準となるしきい値は設備運転条件から設定することができる。これにより、組電池３の放電時間や負荷電流などに応じて組電池３の劣化状態を判定することが可能となり、設備容量や運転条件に合わせながら組電池３の交換時期を柔軟に設定することが可能となる。 Moreover, the assembled battery state determination means 13d determines the soundness of the assembled battery 3 based on the number of unit batteries 3a to 3c... Having a difference ΔV between the maximum value and the minimum value larger than the threshold value. When the ratio of the number of unit batteries 3a to 3c... Having the difference ΔV larger than the threshold value to the total number exceeds a predetermined value, it is determined that the entire assembled battery 3 is deteriorated. You can also Thereby, whether the deterioration of the assembled battery 3 is due to the average deterioration of the entire assembled battery 3, or is caused by the deterioration of the individual unit batteries 3a to 3c... Constituting the assembled battery 3. It is possible to determine whether or not measures such as partial replacement or total number replacement of the unit batteries 3a to 3c.
In addition, the threshold value used as the criterion for determining the deterioration state of the assembled battery 3 can be set from the equipment operating conditions. This makes it possible to determine the deterioration state of the assembled battery 3 according to the discharge time or load current of the assembled battery 3, and to flexibly set the replacement time of the assembled battery 3 in accordance with the equipment capacity and operating conditions. Is possible.

また、定期点検時などに行われる放電試験などの機会を活用し、組電池３の各放電ごとの差分ΔＶｎのみを内部メモリ１２に保存し、次回の放電時に差分ΔＶｎをしきい値Ｖｓと比較することにより、組電池３の劣化の進行状況を判定するようにしてもよい。また、必要に応じて各単位電池３ａ〜３ｃ・・・のセル電圧Ｖの温度補正を行うようにしてもよい。また、各単位電池３ａ〜３ｃ・・・の内部抵抗の計測と組み合わせ、各単位電池３ａ〜３ｃ・・・の内部抵抗の変化と連動させて放電試験を自動的に行えるようにしてもよい。これにより、各単位電池３ａ〜３ｃ・・・の内部抵抗の変化による組電池３の劣化の予兆検知と合わせてより精度の高い劣化判定を実現することができる。 Further, by utilizing an opportunity such as a discharge test performed at the time of periodic inspection, only the difference ΔVn for each discharge of the assembled battery 3 is stored in the internal memory 12, and the difference ΔVn is compared with the threshold value Vs at the next discharge. Thus, the progress of deterioration of the assembled battery 3 may be determined. Moreover, you may make it perform the temperature correction of the cell voltage V of each unit battery 3a-3c ... as needed. Further, in combination with the measurement of the internal resistance of each of the unit batteries 3a to 3c, the discharge test may be automatically performed in conjunction with the change of the internal resistance of each of the unit batteries 3a to 3c. Accordingly, it is possible to realize deterioration determination with higher accuracy in combination with detection of a sign of deterioration of the assembled battery 3 due to a change in internal resistance of each of the unit batteries 3a to 3c.

また、組電池３の劣化の判定結果を表示し、組電池３の劣化に対する対応策を指示することにより、組電池３の劣化に対処できるようにしてもよい。
このように、組電池３の放電時の各単位電池３ａ〜３ｃ・・・間の電位差を活用することにより、制御弁式鉛蓄電池のように電解液量が限定される蓄電池の他、電解液量が豊富や液式鉛蓄電池やアルカリ蓄電池などのように抵抗値の変化が小さな蓄電池や、頻繁に放電を繰り返すような用途に用いられる蓄電池の劣化を精度よく検出することが可能となる。 Further, the deterioration determination result of the assembled battery 3 may be displayed, and a countermeasure against the deterioration of the assembled battery 3 may be instructed to cope with the deterioration of the assembled battery 3.
As described above, by utilizing the potential difference between the unit batteries 3a to 3c at the time of discharging the assembled battery 3, in addition to the storage battery in which the amount of the electrolytic solution is limited, such as a control valve type lead storage battery, the electrolytic solution It is possible to accurately detect the deterioration of a storage battery that is used in abundant amounts or has a small change in resistance value, such as a liquid lead storage battery or an alkaline storage battery, or a frequently repeated discharge.

さらに、各単位電池３ａ〜３ｃ・・・の最大電圧Ｖｍａｘと最小電圧Ｖｍｉｎとの差分ΔＶｎのみを算出すればよく、少ないデータ数で組電池３の劣化を判定することが可能となることから、内部メモリ１２の容量を小さくすることができ、組電池３の全寿命期間における長期間の運用においても、設備にかかるコストを抑制することが可能となるとともに、組電池３の劣化判定に必要な演算量も少なくすることができ、判定時間を短縮することができる。 Furthermore, it is only necessary to calculate the difference ΔVn between the maximum voltage Vmax and the minimum voltage Vmin of each of the unit batteries 3a to 3c, and it is possible to determine the deterioration of the assembled battery 3 with a small number of data. The capacity of the internal memory 12 can be reduced, and it is possible to suppress the cost of the equipment even in the long-term operation in the entire lifetime of the assembled battery 3, and it is necessary for determining the deterioration of the assembled battery 3. The amount of calculation can be reduced and the determination time can be shortened.

図４は、図１の組電池状態測定装置の組電池劣化判定方法を示すフローチャートである。
図４において、組電池状態測定装置７は組電池３の放電を検出すると（ステップＳ１）、データ収集部１１は、各単位電池３ａ〜３ｃ・・・の放電時の電圧を電圧計Ｖａ、Ｖｂ・・・を介して収集し、内部メモリ１２に記憶する（ステップＳ２）。そして、最大値／最小値算出手段１３ａは所定時間の経過を待って（ステップＳ３）、各単位電池３ａ〜３ｃ・・・の放電時の電圧を比較することにより、各単位電池３ａ〜３ｃ・・・の同時刻における最大電圧Ｖｍａｘと最小電圧Ｖｍｉｎを検出する（ステップＳ４）。なお、組電池３が非常用電源設備として用いられる場合、機器容量や負荷条件にはほとんど変動がないため、所定時間の経過後の値を最終的に比較値として用いることができる。そして、差分算出手段１３ｂは、各単位電池３ａ〜３ｃ・・・の最大電圧Ｖｍａｘと最小電圧Ｖｍｉｎとの差分ΔＶｎを算出し（ステップＳ５）、比較手段１３ｃは、最大電圧Ｖｍａｘと最小電圧Ｖｍｉｎとの差分ΔＶｎをしきい値Ｖｓと比較する（ステップＳ６）。そして、組電池状態判定手段１３ｄは、ΔＶｎ＞Ｖｓの関係をみたす場合、組電池３が劣化していると判定し（ステップＳ７）、ΔＶｎ≦Ｖｓの関係をみたす場合、ステップＳ１に戻って以上の処理を繰り返す。 FIG. 4 is a flowchart showing an assembled battery deterioration determination method of the assembled battery state measurement device of FIG.
4, when the assembled battery state measurement device 7 detects the discharge of the assembled battery 3 (step S1), the data collection unit 11 determines the voltage at the time of discharging each of the unit batteries 3a to 3c. Are collected and stored in the internal memory 12 (step S2). Then, the maximum value / minimum value calculating means 13a waits for the elapse of a predetermined time (step S3), and compares the voltages at the time of discharging of the unit batteries 3a to 3c. The maximum voltage Vmax and the minimum voltage Vmin at the same time are detected (step S4). When the assembled battery 3 is used as an emergency power supply facility, there is almost no change in the equipment capacity and load conditions, so that a value after a predetermined time can be finally used as a comparison value. Then, the difference calculating means 13b calculates a difference ΔVn between the maximum voltage Vmax and the minimum voltage Vmin of each of the unit batteries 3a to 3c (step S5), and the comparing means 13c calculates the maximum voltage Vmax and the minimum voltage Vmin. Is compared with the threshold value Vs (step S6). Then, the assembled battery state determination unit 13d determines that the assembled battery 3 is deteriorated when the relationship ΔVn> Vs is satisfied (step S7), and returns to step S1 when the relationship ΔVn ≦ Vs is satisfied. Repeat the process.

容量２００Ａｈ・２Ｖの液式鉛蓄電池２４個を直列に接続し、４８Ｖの直流電源装置を組電池として構成した。この直流電源装置は基本的には非常用電源として構成されるが、この直流電源装置が設置される環境では、他の設備の点検あるいは直流電源装置の点検のために頻繁に計画停電があり、放電回数が多い環境に設置される。
この直流電源装置を構成する各単位電池には電圧測定器が設置され、各単位電池のセル電圧が周期的に測定される。そして、この測定されたセル電圧がデータ収集装置に集積され、通常時は１日のうちの所定時刻に１日分のデータが平均化され、この平均値を当日の電圧データとして保存される。また、組電池の総電圧も同様に処理される。 Twenty-four liquid lead acid batteries with a capacity of 200 Ah · 2 V were connected in series, and a 48 V DC power supply device was configured as an assembled battery. This DC power supply is basically configured as an emergency power supply, but in the environment where this DC power supply is installed, there are frequent planned power outages due to inspection of other equipment or DC power supply, Installed in an environment where there are many discharges.
A voltage measuring device is installed in each unit battery constituting this DC power supply device, and the cell voltage of each unit battery is periodically measured. Then, the measured cell voltage is accumulated in the data collecting device, and the data for one day is averaged at a predetermined time of the day in normal times, and this average value is stored as voltage data of the day. Further, the total voltage of the assembled battery is similarly processed.

このデータ収集装置には電圧比較回路が内蔵され、電圧比較回路は、組電池の総電圧または各単位電池のセル電圧が設定値以下（例えば、２．１Ｖ／セル以下）となった段階で、直流電源装置の放電開始と判断することができる。また、放電開始後に組電池の総電圧または各単位電池のセル電圧が設定値以上（例えば、２．０５Ｖ／セル以上）となった時点で放電完了と判断することができる。 This data collection device has a built-in voltage comparison circuit, and the voltage comparison circuit is configured such that when the total voltage of the assembled battery or the cell voltage of each unit battery becomes a set value or less (for example, 2.1 V / cell or less), It can be determined that the discharge of the DC power supply device has started. Moreover, it can be determined that the discharge is complete when the total voltage of the assembled battery or the cell voltage of each unit battery becomes equal to or higher than a set value (for example, 2.05 V / cell or higher) after the discharge starts.

そして、データ収集装置は、直流電源装置の放電開始を検出した時点で、各単位電池の放電電圧を一定時間ごと（たとえば、１分ごと）に測定し、これら一連の測定値の中から最大値および最小値を検出し、最大値と最小値の差分を算出する。なお、この最大値と最小値の差分は、各測定時間に関連付けられて保存される。そして、直流電源装置の放電開始から１０分後の放電電圧の差分を、直流電源装置の運用開始後の定期検査の時に測定した。この時の測定結果と運用開始後の経過年数との関係を図５に示す。 The data collection device measures the discharge voltage of each unit battery at regular time intervals (for example, every minute) at the time when the discharge start of the DC power supply device is detected, and the maximum value is selected from the series of measurement values. Then, the minimum value is detected, and the difference between the maximum value and the minimum value is calculated. Note that the difference between the maximum value and the minimum value is stored in association with each measurement time. And the difference of the discharge voltage 10 minutes after the discharge start of a DC power supply device was measured at the time of the periodic inspection after the operation start of a DC power supply device. FIG. 5 shows the relationship between the measurement result at this time and the number of years that have elapsed since the operation started.

図５において、５年目までは各単位電池の放電電圧の最大値と最小値の差分は１０ｍＶ以下と小さく、組電池としての健全性が維持されていることが判る。また、この段階までに停電による非常用発電設備の作動もあったが、問題なく動作することも確認できた。
その後の時間の経過に伴って、各単位電池の放電電圧の最大値と最小値の差分の急速な増大が確認され、８年目には４９ｍＶまで増大した。この段階で、この設備のしきい値である５０ｍＶに近づいていることが確認されたため、実負荷試験運転を手動にて実施した。この結果、直流電源装置の放電持続時間が設計値の１時間に対して１時間２分程度あり、設計値とほぼ同じであることを確認した。ここで、各単位電池の放電電圧の最大値と最小値の差分がこれ以上拡大すると、直流電源装置の放電持続時間が設計値を満足できない状況となると判断されるため、直流電源装置の交換時期と判定した。 In FIG. 5, the difference between the maximum value and the minimum value of the discharge voltage of each unit battery is as small as 10 mV or less until the fifth year, and it can be seen that the integrity of the assembled battery is maintained. In addition, there was an emergency power generation system operation due to a power failure up to this stage, but it was also confirmed that it worked without problems.
Along with the passage of time thereafter, a rapid increase in the difference between the maximum value and the minimum value of the discharge voltage of each unit battery was confirmed, and it increased to 49 mV in the 8th year. At this stage, since it was confirmed that it was close to the threshold value of 50 mV for this equipment, the actual load test operation was performed manually. As a result, it was confirmed that the discharge duration of the DC power supply device was about 1 hour and 2 minutes with respect to the design value of 1 hour, which was almost the same as the design value. Here, when the difference between the maximum value and the minimum value of the discharge voltage of each unit battery is further increased, it is determined that the discharge duration of the DC power supply device cannot satisfy the design value. It was determined.

また、この直流電源装置に内部抵抗測定装置も取り付け、各単位電池の内部抵抗も測定し、図６に示すように、直流電源装置の運用開始後の経過年数と内部抵抗の最大値および最小値の変化の関係を調べた。この結果、直流電源装置の運用年数が経過しても、内部抵抗の変化は非常に小さく、直流電源装置の劣化の予兆を検出できるレベルにないことが確認できた。 Also, an internal resistance measuring device is attached to this DC power supply device, and the internal resistance of each unit battery is also measured. As shown in FIG. 6, the number of years that have elapsed since the DC power supply device started operation and the maximum and minimum values of internal resistance. The relationship between changes was investigated. As a result, it was confirmed that even when the operating years of the DC power supply device passed, the change in internal resistance was very small, and it was not at a level that could detect a sign of deterioration of the DC power supply device.

本発明の一実施形態に係る組電池状態測定装置が用いられる組電池のシステムの概略構成を示すブロック図である。It is a block diagram which shows schematic structure of the system of the assembled battery in which the assembled battery state measuring apparatus which concerns on one Embodiment of this invention is used. 図１の組電池状態測定装置の概略構成を示すブロック図である。It is a block diagram which shows schematic structure of the assembled battery state measuring apparatus of FIG. 図１の組電池状態測定装置の組電池劣化判定方法を示す図である。It is a figure which shows the assembled battery deterioration determination method of the assembled battery state measuring apparatus of FIG. 図１の組電池状態測定装置の組電池劣化判定方法を示すフローチャートである。It is a flowchart which shows the assembled battery deterioration determination method of the assembled battery state measuring apparatus of FIG. 本発明の一実施形態に係る組電池の経過年数と電圧バラツキとの関係を示す図である。It is a figure which shows the relationship between the age of the assembled battery which concerns on one Embodiment of this invention, and voltage variation. 本発明の一実施形態に係る組電池の経過年数と内部抵抗の変化との関係を示す図である。It is a figure which shows the relationship between the elapsed years of the assembled battery which concerns on one Embodiment of this invention, and the change of internal resistance.

Explanation of symbols

１電力系統
２充電器
３組電池
４インバータ
５交流負荷
６直流負荷
７組電池状態測定装置
３ａ〜３ｃ単位電池
Ｖａ、Ｖｂ電圧計
１１データ収集部
１２内部メモリ
１３演算機能
１３ａ最大値／最小値検出手段
１３ｂ差分算出手段
１３ｃ比較手段
１３ｄ組電池状態判定手段
１４表示部 DESCRIPTION OF SYMBOLS 1 Electric power system 2 Charger 3 Assembled battery 4 Inverter 5 AC load 6 DC load 7 Assembled battery state measuring device 3a-3c Unit battery Va, Vb Voltmeter 11 Data collection part 12 Internal memory 13 Calculation function 13a Maximum value / minimum value detection Means 13b Difference calculation means 13c Comparison means 13d Battery pack state determination means 14 Display unit

Claims

Maximum value / minimum value detecting means for detecting the maximum value and the minimum value of the voltage at the time of discharge of each unit battery constituting the assembled battery used as an emergency power supply facility;
Difference calculating means for calculating a difference between the maximum value and the minimum value of the voltage of the unit battery;
A comparison means for comparing a difference between a maximum value and a minimum value of the voltage of the unit battery with a threshold value;
An assembled battery state measuring device comprising: an assembled battery state determining unit that determines a deterioration state of the assembled battery based on a comparison result by the comparing unit.

Electrically disconnecting the assembled battery and the charger while the assembled battery used as an emergency power supply facility is connected to a load;
Detecting a maximum value and a minimum value of a voltage at the time of discharging each unit battery constituting the assembled battery in a state of being electrically disconnected from the charger;
Calculating a difference between a maximum value and a minimum value of the voltage of the unit battery;
Comparing a difference between a maximum value and a minimum value of the voltage of the unit battery with a threshold value;
And a step of determining a deterioration state of the assembled battery based on a comparison result by the comparing means.

3. The assembled battery deterioration determining method according to claim 2, wherein a threshold value that is a criterion for determining the deterioration state of the assembled battery is set based on facility operating conditions.

4. The assembled battery deterioration determination according to claim 2, wherein the health of the assembled battery is determined based on the number of unit batteries having a difference between the maximum value and the minimum value larger than a threshold value. Method.