JPH1021965A - Abnormality deciding device for assembled battery - Google Patents
Abnormality deciding device for assembled batteryInfo
- Publication number
- JPH1021965A JPH1021965A JP8188643A JP18864396A JPH1021965A JP H1021965 A JPH1021965 A JP H1021965A JP 8188643 A JP8188643 A JP 8188643A JP 18864396 A JP18864396 A JP 18864396A JP H1021965 A JPH1021965 A JP H1021965A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- circuit
- abnormality
- determination
- distribution
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Secondary Cells (AREA)
- Tests Of Electric Status Of Batteries (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、組電池の異常判
定装置の構成に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a configuration of a battery pack abnormality determination device.
【０００２】[0002]
【従来の技術】組電池は複数の単電池を直列に接続して
構成される。各単電池はそれぞれ組電池の一部として機
能し、一個の単電池でも故障すれば、組電池全体の機能
が損なわれて異常となる。組電池の異常判定は、各単電
池ごとの故障検出によって行える。単電池は固有の端子
電圧をもち、その端子電圧が通常一定の範囲内で変動す
るため、範囲外の電圧検出は単電池の故障であり、それ
によって組電池の異常を判定することができる。2. Description of the Related Art An assembled battery is constructed by connecting a plurality of cells in series. Each unit cell functions as a part of the assembled battery. If even one unit cell fails, the function of the entire assembled battery is impaired and an abnormality occurs. The abnormality determination of the assembled battery can be performed by detecting the failure of each unit cell. Since a cell has a unique terminal voltage, and the terminal voltage usually fluctuates within a certain range, detecting a voltage outside the range is a failure of the cell, thereby making it possible to determine abnormality of the assembled battery.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、上記従
来の検出方法では、例えば電気自動車用の組電池のよう
に高電圧が必要となる場合、使用する単電池の個数が増
える。このように組電池を構成する単電池の個数が増え
ると、それに応じて故障判断装置の個数も増大すること
になり、構成される異常判定装置が大型となり、コスト
が高くなるという問題も生ずる。本発明は、上記従来の
問題点に鑑み、組電池内の単電池の電圧分布を簡単に検
出し、その分布から異常な単電池の発生を検知する組電
池の異常判定装置を提供することを目的としている。However, in the conventional detection method, when a high voltage is required, for example, in a battery pack for an electric vehicle, the number of cells used increases. As described above, when the number of cells constituting the assembled battery increases, the number of failure determination devices also increases accordingly, which causes a problem that the configured abnormality determination device becomes large and the cost increases. The present invention has been made in view of the above-described conventional problems, and provides an assembled battery abnormality determination device that easily detects a voltage distribution of a unit cell in an assembled battery and detects occurrence of an abnormal unit cell from the distribution. The purpose is.
【０００４】[0004]
【問題を解決するための手段】このため、請求項１記載
の発明は、複数の単電池を直列に接続して構成された組
電池の異常判定装置であって、各単電池の端子電圧に複
数の電圧判定点を設定し、各判定点の端子電圧をしきい
値比較で検出する電圧判定手段と、各単電池の同じ判定
点の電圧検出結果をロジック演算するロジック演算手段
と、各ロジック演算手段の出力の組み合わせから単電池
の電圧分布域を検出する電圧分布検出手段と、前記電圧
分布域が所定範囲内か否かによって組電池の異常を判定
する異常判定手段とを有するものとした。また、前記異
常判定手段は、前記ロジック演算手段の出力の組み合わ
せにより、実存しない分布電圧の検出の有無から、装置
が故障したかの自己診断を行なうこともできる。SUMMARY OF THE INVENTION Therefore, the invention according to claim 1 is an apparatus for judging abnormality of an assembled battery constituted by connecting a plurality of cells in series, wherein the terminal voltage of each cell is determined. Voltage determination means for setting a plurality of voltage determination points and detecting a terminal voltage of each determination point by threshold value comparison, logic operation means for performing a logic operation on a voltage detection result of the same determination point of each cell, and each logic It has voltage distribution detecting means for detecting a voltage distribution area of the cell from a combination of outputs of the arithmetic means, and abnormality determining means for determining abnormality of the assembled battery depending on whether the voltage distribution area is within a predetermined range. . Further, the abnormality determination means can perform a self-diagnosis of whether the device has failed based on the presence or absence of the detection of a non-existent distributed voltage, based on a combination of outputs of the logic operation means.
【０００５】請求項４記載の発明は、複数の単電池を直
列に接続して構成された組電池の異常判定装置であっ
て、各単電池の端子電圧に電圧判定点を設定し、判定点
の端子電圧をしきい値比較で検出する電圧判定手段と、
前記組電池の端子電圧を検出する電圧検出手段と、前記
電圧判定手段の判定結果と前記組電池の端子電圧から求
めた単電池の平均端子電圧との差が所定範囲を超えたと
き組電池の異常と判定する異常判定手段を有するものと
した。According to a fourth aspect of the present invention, there is provided an abnormality determination apparatus for a battery pack comprising a plurality of cells connected in series, wherein a voltage determination point is set for a terminal voltage of each cell, and the determination point is determined. Voltage determination means for detecting the terminal voltage of the
Voltage detecting means for detecting the terminal voltage of the battery pack, and the battery pack when the difference between the determination result of the voltage determining means and the average terminal voltage of the cells obtained from the terminal voltage of the battery pack exceeds a predetermined range. The apparatus has an abnormality determining means for determining an abnormality.
【０００６】[0006]
【作用】請求項１記載の発明によれば、各単電池の端子
電圧に複数の電圧判定点を設定し、電圧判定手段は各電
圧判定点の端子電圧をしきい値と比較して検出する。ロ
ジック演算手段は各単電池の同じ判定点の電圧検出結果
をロジック演算し、その演算出力により、電圧分布検出
手段は組電池の電圧分布を検出する。異常判定手段は、
その電圧分布の最小値が所定範囲内か否かを判断して組
電池に異常があるかどうかを判定する。これにより、各
単電池ごとの故障検出が必要とせず、装置の構成が簡単
となるという効果が得られる。According to the first aspect of the present invention, a plurality of voltage judgment points are set for the terminal voltage of each cell, and the voltage judgment means detects the terminal voltage at each voltage judgment point by comparing it with a threshold value. . The logic operation means performs a logic operation on the voltage detection result of the same determination point of each cell, and the voltage distribution detection means detects the voltage distribution of the assembled battery based on the operation output. The abnormality determining means is
It is determined whether or not the minimum value of the voltage distribution is within a predetermined range to determine whether or not the battery pack has an abnormality. As a result, it is not necessary to detect a failure for each unit cell, and the configuration of the device is simplified.
【０００７】請求項４記載の発明では、組電池の端子電
圧から単電池の平均端子電圧が算出される。組電池内に
単電池個数が多いので、個数の少ない単電池が故障して
も平均端子電圧への異常電圧の影響は無視できる。した
がって、単電池の端子電圧を平均端子電圧と比較するこ
とによって、その差が所定値を超えたときに組電池が異
常と判定することができる。これによって、単電池の異
常が確実に検知できる効果が得られる。According to the present invention, the average terminal voltage of the unit cell is calculated from the terminal voltage of the assembled battery. Since the number of cells is large in the assembled battery, even if a small number of cells fail, the influence of the abnormal voltage on the average terminal voltage can be ignored. Therefore, by comparing the terminal voltage of the unit cell with the average terminal voltage, it is possible to determine that the battery pack is abnormal when the difference exceeds a predetermined value. As a result, an effect that the abnormality of the unit cell can be reliably detected is obtained.
【０００８】[0008]
【発明の実施の形態】次に、本発明の実施形態につい
て、実施例により説明する。図１は、本発明の実施例の
構成を示す。複数の単電池１（１ａ、１ｂ、…、１ｎ）
が直列に接続され組電池を構成する。各単電池１の端子
には電圧判定回路２、３、４、５、６が接続される。な
お、図中では各単電池１ａ、１ｂ、…、１ｎに対応して
添字ａ、ｂ、…、ｎを付してある。電圧判定回路２、
３、４、５、６の判定電圧はそれぞれＶｃｃ、Ｖｅｅ、
Ｖｂｂ、Ｖｂｓ、Ｖｏｖとし、Ｖｃｃは単電池１の過放
電電圧の２Ｖに、Ｖｅｅは単電池１の放電末期電圧の
３．４Ｖに、Ｖｂｂは単電池１の充電電流をバイパスに
より調整を許可する電圧の４．０８Ｖに、Ｖｂｓは単電
池１のバイパスによる充電電流の調整代が飽和した直後
の端子電圧の４．１５Ｖに、Ｖｏｖは単電池１の過充電
電圧の４．２Ｖにそれぞれ対応して設定されている。こ
れらの判定電圧値は、充放電制御に用いられる電圧であ
って、その設定は充放電制御において固有の用途がある
が、本実施例ではそれらを兼用したものである。判定電
圧の設定値はこれらに拘束されるものでなく、単電池の
使用電圧内であればよく、また判定点は必要に応じてそ
れ以上に増やしてもよい。Next, embodiments of the present invention will be described with reference to examples. FIG. 1 shows the configuration of an embodiment of the present invention. A plurality of cells 1 (1a, 1b, ..., 1n)
Are connected in series to form a battery pack. Voltage determination circuits 2, 3, 4, 5, and 6 are connected to the terminals of each unit cell 1. In the drawings, subscripts a, b,..., N are assigned to the cells 1a, 1b,. Voltage determination circuit 2,
The determination voltages of 3, 4, 5, and 6 are Vcc, Vee,
Vbb, Vbs, and Vov are set, Vcc is adjusted to 2 V of the overdischarge voltage of the cell 1, Vee is adjusted to 3.4 V of the terminal discharge voltage of the cell 1, and Vbb permits adjustment of the charging current of the cell 1 by bypass. The voltage 4.08V, Vbs corresponds to the terminal voltage 4.15V immediately after the adjustment of the charging current by the bypass of the cell 1 is saturated, and Vov corresponds to the overcharge voltage 4.2V of the cell 1. Is set. These determination voltage values are voltages used for charge / discharge control, and their setting has a specific use in charge / discharge control. In the present embodiment, these values are shared. The set value of the judgment voltage is not limited to these, but may be within the working voltage of the unit cell, and the judgment point may be further increased as necessary.
【０００９】電圧判定回路２ａ、２ｂ、…、２ｎの出力
はＡＮＤ回路７Ａに、電圧判定回路３ａ、３ｂ、…、３
ｎの出力はＡＮＤ回路７Ｂに接続される。電圧判定回路
４ａ、４ｂ、…、４ｎの出力はＯＲ回路７Ｃに、電圧判
定回路５ａ、５ｂ、…、５ｎの出力はＯＲ回路７Ｄに、
電圧判定回路６ａ、６ｂ、…、６ｎの出力はＯＲ回路７
Ｅにそれぞれ接続される。各ＡＮＤ回路７Ａ、７Ｂおよ
びＯＲ回路７Ｃ、７Ｄ、７Ｅの出力が異常判定部８に接
続される。The outputs of the voltage judgment circuits 2a, 2b,..., 2n are supplied to an AND circuit 7A and the voltage judgment circuits 3a, 3b,.
The output of n is connected to the AND circuit 7B. The outputs of the voltage determination circuits 4a, 4b,..., 4n are output to an OR circuit 7C, the outputs of the voltage determination circuits 5a, 5b,.
The outputs of the voltage determination circuits 6a, 6b,.
E respectively. The outputs of the AND circuits 7A and 7B and the OR circuits 7C, 7D and 7E are connected to the abnormality determination unit 8.
【００１０】図２は電圧判定回路２の構成を示す。単電
池１に接続されるしきい値発生回路１０はしきい値電圧
を生成して比較器１２のマイナス端子に出力する。しき
い値電圧は判定電圧に対応して設定され単電池１の端子
電圧が変わっても変化することはない。電圧の分圧回路
１１は単電池１の端子電圧を分圧して比較器１２のプラ
ス端子に印加する。比較器１２は単電池の端子電圧の変
化に応じて、しきい値以下の場合低電位のＬ信号を出力
し、しきい以上の場合は、高電位のＨ信号を出力する。
その判定信号はフォトカプラ１３を介し電気的な絶縁が
行なわれてＡＮＤ回路７Ａに出力する。他の電圧判定回
路３〜６も同様構成で、その判定信号がフォトカプラを
介して対応するＡＮＤ回路あるいはＯＲ回路へ出力され
る。FIG. 2 shows the configuration of the voltage determination circuit 2. The threshold value generating circuit 10 connected to the unit cell 1 generates a threshold voltage and outputs it to the minus terminal of the comparator 12. The threshold voltage is set according to the judgment voltage, and does not change even if the terminal voltage of the cell 1 changes. The voltage dividing circuit 11 divides the terminal voltage of the cell 1 and applies the divided voltage to the plus terminal of the comparator 12. The comparator 12 outputs a low-potential L signal when the voltage is equal to or lower than the threshold value, and outputs a high-potential H signal when the threshold value or higher, according to the change in the terminal voltage of the unit cell.
The determination signal is electrically insulated through the photocoupler 13 and output to the AND circuit 7A. The other voltage determination circuits 3 to 6 have the same configuration, and the determination signal is output to the corresponding AND circuit or OR circuit via the photocoupler.
【００１１】異常判定部８は電圧分布検出回路８１と異
常判定回路８２を有し、電圧分布検出回路８１は、ＡＮ
Ｄ回路７Ａ、７ＢとＯＲ回路７Ｃ〜７Ｅのロジック出力
から組電池内の単電池電圧の分布を検出し、異常判定回
路８２はその分布差の最小値が許容値ΔＶ内か否かを判
定し、許容値ΔＶを超えた場合組電池に異常端子電圧を
発生する単電池があるものと判定する。ここでは許容値
ΔＶは０．２Ｖとする。図３はＡＮＤ回路とＯＲ回路の
ロジック出力と組電池内の端子電圧の分布との対応関係
のすべてを示している。図３の（ａ）は、端子電圧と対
応関係を持った１２のパタ−ンのロジック出力信号の組
み合わせを示し、図３の（ｂ）は信号の組み合わせが示
す単電池電圧の分布幅の最大範囲すなわち存在可能性が
ある範囲を示している。The abnormality judging unit 8 has a voltage distribution detecting circuit 81 and an abnormality judging circuit 82.
From the logic outputs of the D circuits 7A and 7B and the OR circuits 7C to 7E, the distribution of the cell voltage in the assembled battery is detected, and the abnormality determination circuit 82 determines whether the minimum value of the distribution difference is within the allowable value ΔV. If the allowable value ΔV is exceeded, it is determined that there is a unit cell that generates an abnormal terminal voltage in the assembled battery. Here, the allowable value ΔV is 0.2V. FIG. 3 shows all correspondences between the logic outputs of the AND circuit and the OR circuit and the distribution of terminal voltages in the battery pack. FIG. 3A shows a combination of 12 patterns of logic output signals having a correspondence with the terminal voltage, and FIG. 3B shows a maximum distribution width of the cell voltage indicated by the combination of the signals. The range, that is, the range that may exist.
【００１２】ロジック回路の出力の組み合わせによる電
圧分布の検出は以下の通りである。Ｎｏ．１の組み合わ
せの場合は、すべての電圧は３、４Ｖ以上で、しかも少
なくとも１つの電圧が４．２Ｖ以上であると判断でき
る。その電圧分布幅の最小値は０Ｖである。Ｎｏ．２の
組み合わせの場合は、すべての電圧が２Ｖ以上で、少な
くとも１つの電圧が３、４Ｖ以下と、少なくとも１つの
電圧が４．２Ｖ以上と判断できる。その電圧分布幅の最
小値は０、８（４．２−３．４）Ｖである。The detection of the voltage distribution by the combination of the outputs of the logic circuit is as follows. No. In the case of one combination, it can be determined that all voltages are 3, 4 V or more, and at least one voltage is 4.2 V or more. The minimum value of the voltage distribution width is 0V. No. In the case of the combination of 2, it can be determined that all voltages are 2 V or more, at least one voltage is 3, 4 V or less, and at least one voltage is 4.2 V or more. The minimum value of the voltage distribution width is 0, 8 (4.2-3.4) V.
【００１３】Ｎｏ．３の組み合わせの場合は、少なくと
も、１つの電圧が２Ｖ以下と、少なくとも１つの電圧が
４．２Ｖ以上と判断できる。電圧分布幅の最小値は２．
２（４．２−２）Ｖである。Ｎｏ．４の組み合わせの場
合は、すべての電圧が３．４Ｖ以上と、少なくとも１つ
の電圧が４．１５Ｖ以上、かつすべての電圧が４．２Ｖ
以下であると判断できる。電圧分布幅は０である。No. In the case of the combination of 3, it can be determined that at least one voltage is 2 V or less and at least one voltage is 4.2 V or more. The minimum value of the voltage distribution width is 2.
2 (4.2-2) V. No. In the case of the combination of 4, all voltages are 3.4 V or more, at least one voltage is 4.15 V or more, and all voltages are 4.2 V
It can be determined that: The voltage distribution width is 0.
【００１４】Ｎｏ．５の組み合わせの場合は、すべての
電圧が２Ｖ以上で、少なくとも１つの電圧が３．４Ｖ以
下、かつ少なくとも１つの電圧が４．１５Ｖ以上と、す
べての電圧が４．２Ｖ以下であると判断できる。電圧分
布最小幅は０、７５（４．１５−３．４）Ｖである。Ｎ
ｏ．６の組み合わせの場合は、少なくとも１つの電圧が
２Ｖ以下で、しかも少なくとも１つの電圧が４．１５Ｖ
以上、かつすべてが４、２Ｖ以下であると判断できる。
その電圧最小分布幅は２．１５（４．１５−２）Ｖであ
る。Ｎｏ．７の組み合わせの場合は、全ての電圧が３．
４Ｖ以上で、かつ全ての電圧が４．１５Ｖ以下であると
判断できる、その電圧最小分布幅は０Ｖである。No. In the case of a combination of 5, it can be determined that all voltages are 2 V or more, at least one voltage is 3.4 V or less, and at least one voltage is 4.15 V or more, and all voltages are 4.2 V or less. . The minimum width of the voltage distribution is 0, 75 (4.15-3.4) V. N
o. In the case of the combination of 6, at least one voltage is 2 V or less, and at least one voltage is 4.15 V
As described above, it can be determined that all voltages are equal to or less than 4, 2 V.
The minimum voltage distribution width is 2.15 (4.15-2) V. No. In the case of the combination of 7, all the voltages are 3.
It can be determined that the voltage is equal to or higher than 4 V and all voltages are equal to or lower than 4.15 V. The minimum voltage distribution width is 0 V.
【００１５】Ｎｏ．８の組み合わせの場合は、全ての電
圧が２Ｖ以上で、かつすべての電圧が４．１５以下と、
少なくとも１の電圧が３．４Ｖ以下と４．０８Ｖ以上に
存在すると判断できる。その最小電圧幅は０．６８
（４．０８−３．４）Ｖである。No. In the case of the combination of 8, all the voltages are 2 V or more and all the voltages are 4.15 or less,
It can be determined that at least one voltage exists at 3.4 V or less and 4.08 V or more. Its minimum voltage width is 0.68
(4.08-3.4) V.
【００１６】Ｎｏ．９の組み合わせの場合は、全ての電
圧は４、１５Ｖ以下と同時に少なくとも１つの電圧が
４、０８Ｖ以上、かつ少なくとも１つの電圧が２Ｖ以下
であると判断できる。その電圧最小値幅は２．０８
（４．０８−２）Ｖである。Ｎｏ．１０の組み合わせの
場合は、全ての電圧は３．４Ｖ以上であると同時にすべ
ての電圧が４．０８Ｖ以下であると判断できる。その電
圧最小値幅はその範囲中での０Ｖである。No. In the case of the combination of 9, it can be determined that all the voltages are 4, 15 V or less, at least one voltage is 4, 08 V or more, and at least one voltage is 2 V or less. The minimum voltage width is 2.08
(4.08-2) V. No. In the case of 10 combinations, it can be determined that all voltages are equal to or higher than 3.4 V and all voltages are equal to or lower than 4.08 V. The minimum voltage width is 0 V in the range.
【００１７】Ｎｏ．１１の組み合わせの場合は、全ての
電圧は２Ｖ以上、かつ４．０８Ｖ以下の範囲中で、少な
く１つの電圧が３．４Ｖ以下と判断できる。その電圧最
小値幅は０Ｖである。Ｎｏ．１２の組み合わせの場合
は、全ての電圧は４．０８Ｖ以下と同時に、少なくとも
１つの電圧が２Ｖ以下であると判断できる。その電圧最
小値幅は０Ｖである。No. In the case of 11 combinations, all the voltages are within the range of 2 V or more and 4.08 V or less, and at least one voltage can be determined to be 3.4 V or less. The minimum voltage width is 0V. No. In the case of the twelve combinations, it can be determined that all the voltages are 4.08 V or less and at least one voltage is 2 V or less. The minimum voltage width is 0V.
【００１８】したがって異常判定部８では、上記Ｎｏ．
２、Ｎｏ．３、Ｎｏ．５、Ｎｏ．６、Ｎｏ．８、Ｎｏ．
９のロジック出力の組み合わせを検出すると、許容値Δ
Ｖの０．２Ｖを超えるため組電池が異常と判定する。本
実施例は以上のように構成され、各単電池に制御すべき
５つの端子電圧をしきい値比較で検出し、ロジック演算
により端子電圧の分布を求め、その電圧分布の最小値が
所定値を超えたかどうかによって組電池の異状を検出す
るため、単電池ごとの故障検出が不要で、装置の構成が
簡単となるという効果が得られる。なお、上記１２のパ
タ−ン以外の組み合わせは電圧検出値と対応関係を持た
ないため、異常判定部８の故障判定に用いることができ
る。Therefore, in the abnormality determination section 8, the above No.
2, No. 3, No. 5, no. 6, no. 8, No.
9 is detected, the allowable value Δ
Since V exceeds 0.2V, it is determined that the assembled battery is abnormal. The present embodiment is configured as described above. Five terminal voltages to be controlled for each cell are detected by threshold value comparison, a distribution of terminal voltages is obtained by logic operation, and the minimum value of the voltage distribution is a predetermined value. Since the abnormality of the assembled battery is detected depending on whether or not the number exceeds the threshold, it is not necessary to detect the failure of each unit cell, and the effect that the configuration of the device is simplified can be obtained. Since combinations other than the above-mentioned 12 patterns have no correspondence with the detected voltage value, they can be used for the failure determination of the abnormality determination unit 8.
【００１９】次に、本発明の第２の実施例について説明
する。第１の実施例では、端子電圧の分布の最小値から
組電池の異常判定を示したが、この実施例は、各単電池
の平均端子電圧を検出し、端子電圧の分布が所定領域を
超えたときに、平均端子電圧が所定値に収まっているか
否かによって組電池の異常を判定するものである。Next, a second embodiment of the present invention will be described. In the first embodiment, the abnormality determination of the assembled battery is described from the minimum value of the distribution of the terminal voltage. However, in this embodiment, the average terminal voltage of each cell is detected, and the distribution of the terminal voltage exceeds the predetermined region. In this case, the abnormality of the battery pack is determined based on whether or not the average terminal voltage is within a predetermined value.
【００２０】単電池は図４に示すように端子電圧にばら
つきがある。端子電圧のばらつきは、通常平均電圧Ｖａ
ｖｅに対し一定の範囲内に収まっている。したがってＮ
ｏ．８のように端子電圧が平均値から大きく離れた単電
池が発生すると、組電池が異常と判定できる。この判定
は単電池の使用電圧範囲の全域内で行える。本実施例で
は、最も異常が検出しやすい使用上限電圧である過充電
電圧Ｖｏｖと使用下限電圧である過放電電圧Ｖｃｃで行
う。判定条件も単電池の電圧感度を考慮して、上限での
判定条件はＶｔ１とし、下限での判定条件はＶｔ２とす
る。図５に示す結果は過放電電圧Ｖｃｃ（２Ｖ）を下回
ったときに端子の平均端子電圧ＶａｖｅとＶｃｃの差が
Ｖｔ２より大きいから、異常状態と判断される。As shown in FIG. 4, unit cells have variations in terminal voltage. The variation in terminal voltage is usually the average voltage Va
ve is within a certain range. Therefore N
o. When a unit cell whose terminal voltage is far away from the average value as shown in FIG. 8 occurs, the assembled battery can be determined to be abnormal. This determination can be made within the entire operating voltage range of the unit cell. In this embodiment, the operation is performed with the overcharge voltage Vov, which is the upper limit voltage at which abnormality is most easily detected, and the overdischarge voltage Vcc, which is the lower limit voltage of use. Considering the voltage sensitivity of the unit cell, the determination condition at the upper limit is set to Vt1, and the determination condition at the lower limit is set to Vt2. In the result shown in FIG. 5, the difference between the average terminal voltage Vave and Vcc of the terminal is larger than Vt2 when the voltage is lower than the overdischarge voltage Vcc (2 V), so that it is determined that the state is abnormal.
【００２１】図６は、本実施例の構成を示し、図１が示
す第１の実施例の異常判定部８の代わりに異常判定部８
Ａを用い、組電池の端子電圧を検出する電圧検出計９を
設けたものである。異常判定部８Ａは電圧分布検出回路
８３と、平均端子電圧算出回路８４および異常判定回路
８５を有し、異常判定回路８５には判定条件としての比
較基準値Ｖｔ１とＶｔ２を設けている。平均端子電圧算
出回路８４は電圧検出計の検出値を単電池の数で割って
単電池の平均端子電圧を算出する。この算出される平均
電圧は、単電池の個数が多いため、少数の単電池が故障
しても平均値への異常電圧の影響は無視できる。電圧分
布検出回路８３は、ＡＮＤ回路とＯＲ回路からのロジッ
ク信号により、前記図３に示すように端子電圧の分布を
検出する。異常判定回路８５は検出される端子電圧の分
布から、例えばＮｏ．３、Ｎｏ．６、Ｎｏ．９のように
Ｖｃｃ以下の検出値がある場合は、電圧Ｖｃｃと端子電
圧の平均値を比較し、その差がＶｔ２より大きいなら組
電池が異常と判定する。本実施例によっても、上記第１
の実施例と同様の効果が得られるとともに、単電池の平
均電圧を検出して、各々の単電池電圧と平均電圧との偏
差の大きさから、異常な単電池が発生していることを検
出するため、検知性に優れ、異常を逃さず検知できる。FIG. 6 shows the configuration of the present embodiment, in which an abnormality determining unit 8 is used instead of the abnormality determining unit 8 of the first embodiment shown in FIG.
A is provided with a voltage detector 9 for detecting the terminal voltage of the assembled battery using A. The abnormality determination unit 8A has a voltage distribution detection circuit 83, an average terminal voltage calculation circuit 84, and an abnormality determination circuit 85, and the abnormality determination circuit 85 has comparison reference values Vt1 and Vt2 as determination conditions. The average terminal voltage calculation circuit 84 calculates the average terminal voltage of the cells by dividing the detection value of the voltage detector by the number of cells. Since the calculated average voltage includes a large number of cells, even if a small number of cells fail, the influence of the abnormal voltage on the average value can be ignored. The voltage distribution detection circuit 83 detects the distribution of the terminal voltage based on the logic signals from the AND circuit and the OR circuit, as shown in FIG. The abnormality determination circuit 85 determines, for example, No. from the distribution of the detected terminal voltages. 3, No. 6, no. When there is a detected value equal to or lower than Vcc as in 9, the average value of the voltage Vcc and the terminal voltage is compared, and if the difference is larger than Vt2, it is determined that the battery pack is abnormal. According to the present embodiment, the first
The same effect as that of the embodiment can be obtained, and the average voltage of the unit cells is detected, and from the magnitude of the deviation between each unit cell voltage and the average voltage, the occurrence of an abnormal unit cell is detected. Therefore, the detection is excellent and the abnormality can be detected without missing.
【００２２】[0022]
【発明の効果】以上説明したように、請求項１の発明で
は、複数の電圧判定点をしきい値として単電池の端子電
圧を比較し、ロジック演算により各単電池間の最小電圧
分布を求め、これにより組電池の異常を判断するものと
したので、各単電池ごとの故障検出が必要とせず、装置
の構成が簡単となるという効果が得られる。請求項４の
発明では、端子電圧の分布が平均端子電圧に対して所定
範囲内に収まったかによって組電池の異常を判定するよ
うにしたので、請求項と同様な効果得られるとともに、
検知性がより優れ、異常を逃さず検知できる効果が得ら
れる。As described above, according to the first aspect of the present invention, the terminal voltages of the cells are compared using a plurality of voltage determination points as thresholds, and the minimum voltage distribution between the cells is obtained by logic operation. Thus, since the abnormality of the assembled battery is determined, it is not necessary to detect the failure of each unit cell, and the effect that the configuration of the device is simplified can be obtained. According to the fourth aspect of the present invention, the abnormality of the battery pack is determined based on whether the distribution of the terminal voltage falls within a predetermined range with respect to the average terminal voltage.
The detection performance is more excellent, and the effect that the abnormality can be detected without missing is obtained.
【図１】本発明の実施例の構成を示すブロック図であ
る。FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention.
【図２】電圧判定回路の構成図である。FIG. 2 is a configuration diagram of a voltage determination circuit.
【図３】ロジック回路の出力と端子電圧の分布の関係を
示す図である。FIG. 3 is a diagram illustrating a relationship between an output of a logic circuit and a distribution of terminal voltages.
【図４】単電池の故障を示す図である。FIG. 4 is a view showing a failure of a unit cell.
【図５】故障の検出状態を示す図である。FIG. 5 is a diagram showing a failure detection state.
【図６】第２実施例の構成を示すブロック図である。FIG. 6 is a block diagram showing a configuration of a second embodiment.
１ａ、１ｂ、…、１ｎ 単電池 ２、３、４、５、６ 電圧判定回路 ７ａ、７ｂ ＡＮＤ回路 ７ｃ、７ｄ、７ｅ ＯＲ回路 ８、８ａ 異状判定部 ９ 端子電圧の検出回路 ８１、８３ 電圧分布検出回路 ８２、８５ 異常判定回路 ８４ 平均端子電圧演算回路 1a, 1b,..., 1n cells 2, 3, 4, 5, 6 Voltage judgment circuit 7a, 7b AND circuit 7c, 7d, 7e OR circuit 8, 8a Abnormality judgment section 9 Terminal voltage detection circuit 81, 83 Voltage distribution Detection circuit 82, 85 Abnormality judgment circuit 84 Average terminal voltage calculation circuit
Claims (5)
た組電池の異常判定装置であって、各単電池の端子電圧
に複数の電圧判定点を設定し、各判定点の端子電圧をし
きい値比較で検出する電圧判定手段と、各単電池の同じ
判定点の電圧検出結果をロジック演算するロジック演算
手段と、各ロジック演算手段の出力の組み合わせから単
電池の電圧分布域を検出する電圧分布検出手段と、前記
電圧分布域が所定範囲内か否かによって組電池の異常を
判定する異常判定手段とを有することを特徴とする組電
池の異常判定装置。1. An abnormality determination apparatus for a battery pack comprising a plurality of cells connected in series, wherein a plurality of voltage determination points are set for a terminal voltage of each cell, and a terminal voltage of each determination point is set. Determination means for detecting a voltage by a threshold value comparison, a logic operation means for performing a logic operation on a voltage detection result of the same determination point of each cell, and a voltage distribution area of the cell is detected from a combination of outputs of the logic operation means A battery distribution abnormality detecting device for determining whether or not the battery distribution is within a predetermined range.
期電圧、バイパスによる充電電流の調整を許可する電
圧、バイパスによる充電電流の調整代が飽和した直後の
端子電圧、過充電電圧からなり、前記ロジック演算手段
は前記過放電電圧と放電末期電圧を検出する電圧判定手
段の検出結果がそれぞれ入力されるＡＮＤ回路と、前記
バイパス許可電圧、充電電流の調整代が飽和した直後の
端子電圧および過充電電圧を検出する電圧判定手段の検
出結果がそれぞれ入力されるＯＲ回路とからなり、前記
電圧分布検出手段は、前記ＡＮＤ回路とＯＲ回路の出力
の組み合わせにより前記単電池の電圧の分布域を検出
し、前記異常判定手段は、前記電圧分布域内の分布幅最
小値を所定値と比較して、組電池の異常を判定すること
を特徴とする請求項１記載の組電池の異常判定装置。2. The voltage judging point comprises an overdischarge voltage, an end-of-discharge voltage, a voltage permitting adjustment of a charge current by a bypass, a terminal voltage immediately after a charge current adjustment by a bypass is saturated, and an overcharge voltage. The logic operation means includes an AND circuit to which detection results of the voltage determination means for detecting the overdischarge voltage and the end-of-discharge voltage are respectively input, the bypass permission voltage, the terminal voltage immediately after the adjustment of the charging current is saturated, and An OR circuit to which the detection results of the voltage determination means for detecting the overcharge voltage are respectively input; and the voltage distribution detection means determines a voltage distribution range of the cell by a combination of the outputs of the AND circuit and the OR circuit. 2. The apparatus according to claim 1, wherein the abnormality determining unit detects the abnormality of the assembled battery by comparing a minimum value of the distribution width in the voltage distribution area with a predetermined value. Abnormality judging device of the above-mentioned assembled battery.
存しない電圧分布域の組み合わせが検出されると、前記
異常判定手段は装置が故障したと判断する自己診断機能
を有することを特徴とする請求項１または２記載の組電
池の異常判定装置。3. The abnormality judgment means has a self-diagnosis function of judging that the device has failed when a combination of nonexistent voltage distribution areas is detected from the output of each of the logic operation means. Item 3. An abnormality determination device for a battery pack according to item 1 or 2.
た組電池の異常判定装置であって、各単電池の端子電圧
に電圧判定点を設定し、判定点の端子電圧をしきい値比
較で検出する電圧判定手段と、前記組電池の端子電圧を
検出する電圧検出手段と、前記電圧判定手段の判定結果
と前記組電池の端子電圧から求めた単電池の平均端子電
圧との差が所定範囲を超えたとき組電池の異常と判定す
る異常判定手段を有することを特徴とする組電池の異常
判定装置。4. An abnormality judging device for an assembled battery comprising a plurality of cells connected in series, wherein a voltage judgment point is set to a terminal voltage of each cell, and a terminal voltage at the judgment point is thresholded. Voltage determining means for detecting by a value comparison, voltage detecting means for detecting a terminal voltage of the battery pack, and a difference between a determination result of the voltage determining means and an average terminal voltage of the cell obtained from the terminal voltage of the battery pack. An abnormality determination device for an assembled battery, comprising: abnormality determination means for determining that the assembled battery is abnormal when a value exceeds a predetermined range.
期電圧、バイパスによる充電電流の調整を許可する電
圧、バイパスによる充電電流の調整代が飽和した直後の
端子電圧、過充電電圧からなり、各単電池の同じ判定点
の電圧判定結果をロジック演算するロジック演算回路
と、ロジック演算回路の演算結果から単電池の電圧分布
域を検出する電圧分布検出回路とを備え、前記ロジック
演算回路は、前記過放電電圧と放電末期電圧を検出する
電圧判定手段の検出結果がそれぞれ入力されるＡＮＤ回
路と、前記バイパス許可電圧、充電電流の調整代が飽和
した直後の端子電圧および過充電電圧を検出する電圧判
定手段の検出結果がそれぞれ入力されるＯＲ回路とから
なり、前記電圧分布検出回路は、前記ＡＮＤ回路とＯＲ
回路の出力の組み合わせにより前記単電池の電圧分布域
を検出し、前記異常判定手段は前記電圧分布域から過放
電電圧を下回った電圧または過充電電圧を上回った電圧
を検出したときに、前記平均端子電圧が所定範囲内に収
まっていない場合組電池の異常と判定することを特徴と
する請求項４記載の組電池の異常判定装置。5. The voltage determination point includes an overdischarge voltage, an end-of-discharge voltage, a voltage permitting adjustment of a charging current by a bypass, a terminal voltage immediately after a charge current adjustment by a bypass is saturated, and an overcharge voltage. A logic operation circuit that performs a logic operation on a voltage determination result of the same determination point of each cell, and a voltage distribution detection circuit that detects a voltage distribution region of the cell from the operation result of the logic operation circuit, wherein the logic operation circuit An AND circuit to which the detection results of the voltage determination means for detecting the overdischarge voltage and the end-of-discharge voltage are respectively inputted, and a terminal voltage and an overcharge voltage immediately after saturation of the bypass permission voltage and the adjustment of the charging current are detected. And an OR circuit to which the detection results of the voltage determination means are input.
The voltage distribution range of the unit cell is detected by a combination of outputs of the circuit, and the abnormality determining means detects the voltage lower than the overdischarge voltage or the voltage higher than the overcharge voltage from the voltage distribution range. 5. The battery pack abnormality determination device according to claim 4, wherein it is determined that the battery pack is abnormal when the terminal voltage is not within the predetermined range.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18864396A JP3711639B2 (en) | 1996-06-28 | 1996-06-28 | Abnormality judgment device for battery pack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18864396A JP3711639B2 (en) | 1996-06-28 | 1996-06-28 | Abnormality judgment device for battery pack |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1021965A true JPH1021965A (en) | 1998-01-23 |
| JP3711639B2 JP3711639B2 (en) | 2005-11-02 |
Family
ID=16227311
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18864396A Expired - Fee Related JP3711639B2 (en) | 1996-06-28 | 1996-06-28 | Abnormality judgment device for battery pack |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3711639B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010088221A (en) * | 2008-09-30 | 2010-04-15 | Nippon Chemicon Corp | Capacitor device |
| EP2190055A1 (en) * | 2008-10-10 | 2010-05-26 | Kabushi Kaisha Toshiba | Battery device comprising a voltage detection and control circuit |
| JP2012095388A (en) * | 2010-10-25 | 2012-05-17 | Denso Corp | Battery state monitor |
| US8878493B2 (en) | 2010-10-18 | 2014-11-04 | Denso Corporation | Apparatus for monitoring operation state of battery pack composed of plurality of cells mutually connected in series |
| JP2016090416A (en) * | 2014-11-06 | 2016-05-23 | 日立化成株式会社 | Storage battery condition monitoring system, storage battery condition monitoring method, and storage battery condition monitoring program |
-
1996
- 1996-06-28 JP JP18864396A patent/JP3711639B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010088221A (en) * | 2008-09-30 | 2010-04-15 | Nippon Chemicon Corp | Capacitor device |
| EP2190055A1 (en) * | 2008-10-10 | 2010-05-26 | Kabushi Kaisha Toshiba | Battery device comprising a voltage detection and control circuit |
| US8878493B2 (en) | 2010-10-18 | 2014-11-04 | Denso Corporation | Apparatus for monitoring operation state of battery pack composed of plurality of cells mutually connected in series |
| JP2012095388A (en) * | 2010-10-25 | 2012-05-17 | Denso Corp | Battery state monitor |
| JP2016090416A (en) * | 2014-11-06 | 2016-05-23 | 日立化成株式会社 | Storage battery condition monitoring system, storage battery condition monitoring method, and storage battery condition monitoring program |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3711639B2 (en) | 2005-11-02 |
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