JP2015078908A - Battery pack fault detection apparatus - Google Patents

Battery pack fault detection apparatus Download PDF

Info

Publication number
JP2015078908A
JP2015078908A JP2013216242A JP2013216242A JP2015078908A JP 2015078908 A JP2015078908 A JP 2015078908A JP 2013216242 A JP2013216242 A JP 2013216242A JP 2013216242 A JP2013216242 A JP 2013216242A JP 2015078908 A JP2015078908 A JP 2015078908A
Authority
JP
Japan
Prior art keywords
voltage
battery cell
battery
detection line
disconnection
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.)
Pending
Application number
JP2013216242A
Other languages
Japanese (ja)
Inventor
省二 成田
Seiji Narita
省二 成田
俊也 真保
Toshiya Maho
俊也 真保
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Motors Corp
Original Assignee
Mitsubishi Motors Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Motors Corp filed Critical Mitsubishi Motors Corp
Priority to JP2013216242A priority Critical patent/JP2015078908A/en
Publication of JP2015078908A publication Critical patent/JP2015078908A/en
Pending legal-status Critical Current

Links

Images

Landscapes

  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
  • Tests Of Electric Status Of Batteries (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a battery pack fault detection apparatus configured to detect breaking in all detection lines.SOLUTION: A battery pack fault detection apparatus operates as follows: storing voltages of battery cells and starting a switching element (S10, S12); determining breaking of a detection line located on the side of an adjacent cell of a battery cell when the voltage is less than a first threshold L and the voltage of the adjacent cell is within a determination range (S14-S18); determining breaking of a detection line located not on the side of the adjacent cell of the battery cell when the voltage is less than the first threshold L and the voltage of the adjacent cell is beyond the determination range (S14, S16, S20); setting a fault flag (S22); transmitting a fail-safe value when two fault flags occur in a row, or transmitting the stored voltage when two fault flags do not occur in a row (S24-S28); and resetting the fault flag when the voltage is not less than the first threshold L, and transmitting the latest voltage (S14, S30, S32).

Description

本発明は、組電池の異常検出装置に関し、詳しくは、組電池の検出線の断線検出制御に関する。   The present invention relates to an assembled battery abnormality detection device, and more particularly to disconnection detection control of an assembled battery detection line.

電気自動車の電源装置は、駆動用モータの動力源として大きな出力を得るために、二次電池(例えば、リチウムイオン電池等)からなる複数の充電できる電池セルを直列に接続した電池モジュールを複数直列に接続して高電圧の電力を出力している。そして、電源装置は、全ての電池セルを同じ電流で充電し、また放電する。そして、このような充放電の繰り返しは、電池セルの経時劣化を起こす要因であることが知られている。また、各々の電池セルの電気特性を同一にできないため、電池セル毎に経時劣化の度合いが異なることも知られている。   In order to obtain a large output as a power source for a drive motor, an electric vehicle power supply device is a series of battery modules in which a plurality of rechargeable battery cells made of secondary batteries (for example, lithium ion batteries) are connected in series. It is connected to and outputs high voltage power. And a power supply device charges and discharges all the battery cells with the same electric current. Such repeated charging / discharging is known to cause deterioration of battery cells over time. It is also known that the degree of deterioration with time differs for each battery cell because the electric characteristics of each battery cell cannot be made the same.

このようなことから、各々の電池セルの電圧等を正確に測定し、各々の電池セルの状態を監視するための電池監視ユニット(セルモニタリングユニット)が各々の電池モジュールに設けられている。
しかしながら、各々の電池モジュールの各々の電池セルと電池監視ユニットとを接続する検出線が断線すると電池セルの電圧の検出が困難となる。
For this reason, each battery module is provided with a battery monitoring unit (cell monitoring unit) for accurately measuring the voltage and the like of each battery cell and monitoring the state of each battery cell.
However, if the detection line connecting each battery cell of each battery module and the battery monitoring unit is disconnected, it becomes difficult to detect the voltage of the battery cell.

このようなことから、特許文献1では、各セルC1〜Cnを検出線L1〜Ln+1を介してセル監視部に接続し、セル監視部にて、検出線L2〜Lnの断線の有無を検出している。   For this reason, in Patent Document 1, each cell C1 to Cn is connected to the cell monitoring unit via the detection lines L1 to Ln + 1, and the cell monitoring unit detects whether the detection lines L2 to Ln are disconnected. ing.

特許第5018615号公報Japanese Patent No. 5018615

上記特許文献1の組電池の異常検出装置では、セル監視部にて、検出線L2〜Lnの断線の有無を検出している。
しかしながら、複数の電池セルを直列に構成した電池モジュールの最も電位の高い側の電池セルの正極側に接続される検出線L1と最も電位の電池セルの正極側に接続される低い側の検出線Ln+1の断線の有無の検出を行っておらず、検出線L1と検出線Ln+1の異常を判定することができない。
In the assembled battery abnormality detection device of Patent Document 1, the cell monitoring unit detects the presence or absence of disconnection of the detection lines L2 to Ln.
However, the detection line L1 connected to the positive electrode side of the battery cell having the highest potential in the battery module formed by connecting a plurality of battery cells in series and the detection line on the lower side connected to the positive electrode side of the battery cell having the highest potential. The presence / absence of disconnection of Ln + 1 is not detected, and the abnormality of the detection line L1 and the detection line Ln + 1 cannot be determined.

本発明は、この様な問題を解決するためになされたもので、その目的とするところは、全ての検出線において断線の有無を検出することのできる組電池の異常検出装置を提供することにある。   The present invention has been made to solve such problems, and an object of the present invention is to provide an assembled battery abnormality detection device capable of detecting the presence or absence of disconnection in all detection lines. is there.

上記の目的を達成するために、請求項1の組電池の異常検出装置では、直列に接続された複数の電池セルと、前記複数の電池セルの各々の正極及び負極に一対の検出線を介して並列に接続され、各々の前記電池セルの電圧を検出する電圧検出手段と、前記複数の電池セルの各々の正極及び負極に前記一対の検出線を介して並列に接続され電力を断接する電力断接手段と、隣り合う前記電池セルの各々の前記電力断接手段を交互に断接させ、当該断接時の前記各々の電池セルの電圧に基づいて、前記検出線の断線を判定する断線判定手段と、を備え、前記断線判定手段は、前記複数の電池セルのうちの第1電池セルの前記電圧が所定閾値未満であるか否か、且つ前記複数の電池セルのうちの前記第1電池セルに隣接する第2電池セルの前記電圧が前記所定閾値より高い所定範囲内であるか否かに基づき、前記検出線の断線を判定することを特徴とする。   In order to achieve the above object, in the battery pack abnormality detection device according to claim 1, a plurality of battery cells connected in series, and a positive electrode and a negative electrode of each of the plurality of battery cells via a pair of detection wires. Voltage detecting means for detecting the voltage of each of the battery cells, and power for connecting and disconnecting power connected in parallel to the positive and negative electrodes of each of the plurality of battery cells via the pair of detection lines. Disconnection of disconnecting the detection line based on the voltage of each battery cell at the time of disconnection by alternately disconnecting and connecting the power disconnection means of each of the adjacent battery cells with the disconnection means Determining means, wherein the disconnection determining means determines whether or not the voltage of the first battery cell of the plurality of battery cells is less than a predetermined threshold, and the first of the plurality of battery cells. The voltage of the second battery cell adjacent to the battery cell Based on whether the is within a predetermined high range than the predetermined threshold value, and judging the disconnection of the detection line.

また、請求項2の組電池の異常検出装置では、請求項1において、前記断線判定手段は、前記複数の電池セルのうちの第1電池セルの前記電圧が所定閾値未満で、且つ前記複数の電池セルのうちの前記第1電池セルに隣接する第2電池セルの前記電圧が前記所定閾値より高い所定範囲内であると、前記第1電池セルにおける前記第2電池セル側とは反対側の検出線に断線有りと判定することを特徴とする。   Moreover, in the assembled battery abnormality detection device according to claim 2, the disconnection determination means according to claim 1, wherein the voltage of the first battery cell of the plurality of battery cells is less than a predetermined threshold value, and Of the battery cells, when the voltage of the second battery cell adjacent to the first battery cell is within a predetermined range higher than the predetermined threshold, the first battery cell is opposite to the second battery cell side. It is characterized in that it is determined that the detection line is disconnected.

また、請求項3の組電池の異常検出装置では、請求項1または2において、前記断線判定手段は、前記複数の電池セルのうちの第1電池セルの前記電圧が所定閾値未満で、且つ前記複数の電池セルのうちの前記第1電池セルに隣接する第2電池セルの前記電圧が前記所定閾値より高い所定範囲外であると、前記第1電池セルにおける前記第2電池セル側の検出線に断線有りと判定することを特徴とする。   Moreover, in the assembled battery abnormality detection device according to claim 3, in claim 1 or 2, the disconnection determination unit is configured such that the voltage of the first battery cell of the plurality of battery cells is less than a predetermined threshold value, and The detection line on the second battery cell side in the first battery cell when the voltage of the second battery cell adjacent to the first battery cell out of a plurality of battery cells is outside a predetermined range higher than the predetermined threshold. It is characterized in that it is determined that there is a disconnection.

また、請求項4の組電池の異常検出装置では、請求項2または3において、前記第1電池セルは、前記複数の電池セルのうちの最も電位の高い側に位置する電池セル、或いは最も電位の低い側に位置する電池セルのいずれか一方であることを特徴とする。   Further, in the assembled battery abnormality detection device according to claim 4, in claim 2 or 3, the first battery cell is a battery cell located on the highest potential side of the plurality of battery cells, or the most potential. It is any one of the battery cells located in the low side.

請求項1の発明によれば、隣り合う電池セルに並列に接続される各々の電力断接手段を交互に断接させ、断接時の複数の電池セルのうちの第1電池セルの電圧が所定閾値未満で、且つ複数の電池セルのうちの第1電池セルに隣接する第2電池セルの電圧が所定閾値よりも高い所定範囲内であると、検出線に断線有りと判定することにより、例えば、第1電池セルが直列に接続される複数の電池セルのうちの電圧測定回路の最も電位の高い側に位置する電池セル、或いは最も電位の低い側に位置する電池セルである場合において、隣り合う電池セルに並列に接続される電力断接手段を交互に断接させた時に、第1電池セルの電圧が所定閾値未満であるか否か、且つ第2電池セルの電圧が所定閾値よりも高い所定範囲内であるか否かに基づき、前記検出線の断線を判定することができる。   According to invention of Claim 1, each power connection / disconnection means connected in parallel with an adjacent battery cell is made to connect / disconnect alternately, and the voltage of the 1st battery cell in the some battery cell at the time of connection / disconnection is By determining that the detection line is disconnected when the voltage of the second battery cell adjacent to the first battery cell among the plurality of battery cells is within a predetermined range higher than the predetermined threshold, For example, in the case where the first battery cell is a battery cell located on the highest potential side of the voltage measurement circuit among the plurality of battery cells connected in series, or a battery cell located on the lowest potential side, Whether or not the voltage of the first battery cell is less than a predetermined threshold when the power connection / disconnection means connected in parallel to the adjacent battery cells is alternately connected, and the voltage of the second battery cell is lower than the predetermined threshold Based on whether or not It is possible to determine the disconnection of the detection line.

また請求項2の発明によれば、複数の電池セルのうちの第1電池セルの電圧が所定閾値未満で、且つ複数の電池セルのうちの第1電池セルに隣接する第2電池セルの電圧が所定閾値より高い所定範囲内であると、第1電池セルにおける第2電池セル側とは反対側の検出線に断線有りと判定することができる。
また請求項3の発明によれば、複数の電池セルのうちの第1電池セルの電圧が所定閾値未満で、且つ複数の電池セルのうちの第1電池セルに隣接する第2電池セルの電圧が所定閾値より高い所定範囲外であると、第1電池セルにおける第2電池セル側の検出線に断線有りと判定することができる。
According to the invention of claim 2, the voltage of the first battery cell of the plurality of battery cells is less than the predetermined threshold, and the voltage of the second battery cell adjacent to the first battery cell of the plurality of battery cells. Is within a predetermined range higher than the predetermined threshold, it can be determined that the detection line on the opposite side of the first battery cell from the second battery cell side is disconnected.
According to the invention of claim 3, the voltage of the first battery cell of the plurality of battery cells is less than the predetermined threshold, and the voltage of the second battery cell adjacent to the first battery cell of the plurality of battery cells. Is outside the predetermined range higher than the predetermined threshold, it can be determined that the detection line on the second battery cell side in the first battery cell is disconnected.

また、請求項4の発明によれば、複数の電池セルのうちの最も電位の高い側に位置する電池セル、或いは最も電位の低い側に位置する電池セルのいずれか一方としている。これにより、請求項2または3の発明に基づき、組電池の最も電位の高い側に位置する電池セルの正または負極に接続された電圧検出線、または最も電位の低い側に位置する電池セルの正または負極に接続された電圧検出線の断線を判定することができる。   According to the invention of claim 4, any one of the battery cell located on the side having the highest potential among the plurality of battery cells or the battery cell located on the side having the lowest potential is used. Accordingly, based on the invention of claim 2 or 3, the voltage detection line connected to the positive or negative electrode of the battery cell located on the highest potential side of the assembled battery, or the battery cell located on the lowest potential side The disconnection of the voltage detection line connected to the positive or negative electrode can be determined.

本発明に係る組電池の異常検出装置が適用された電池モジュールの概略構成図である。It is a schematic block diagram of the battery module to which the abnormality detection apparatus of the assembled battery which concerns on this invention was applied. セルモニタリングユニットにて実施される断線検出制御のフローチャートである。It is a flowchart of the disconnection detection control implemented in a cell monitoring unit. 検出線L1の断線時に、偶数側スイッチング素子をONとしたときの電流の流れを示す図である。It is a figure which shows the flow of an electric current when the even number side switching element is set to ON at the time of disconnection of the detection line L1. 検出線L1の断線時に、奇数側スイッチング素子をONとしたときの電流の流れを示す図である。It is a figure which shows the flow of an electric current when the odd number side switching element is set to ON at the time of disconnection of the detection line L1. 検出線L1に一時的な断線が発生した場合の電圧変化の一例を時系列で示す図である。It is a figure which shows an example of a voltage change when a temporary disconnection generate | occur | produces in the detection line L1 in time series. 検出線L1に断続的に複数回の断線が発生した場合の電圧変化の一例を時系列で示す図である。It is a figure which shows an example of a voltage change when the disconnection generate | occur | produces in the detection line L1 several times intermittently in time series. 検出線L1に継続して断線が発生した場合の電圧変化の一例を時系列で示す図である。It is a figure which shows an example of a voltage change at the time of a disconnection generate | occur | produced in the detection line L1 in time series. 検出線L2の断線時に、偶数側スイッチング素子をONとしたときの電流の流れを示す図である。It is a figure which shows the flow of an electric current when the even number side switching element is set to ON at the time of disconnection of the detection line L2. 検出線L2の断線時に、奇数側スイッチング素子をONとしたときの電流の流れを示す図である。It is a figure which shows the flow of an electric current when the odd number side switching element is set to ON at the time of disconnection of the detection line L2. 検出線L2に一時的な断線が発生した場合の電圧変化の一例を時系列で示す図である。It is a figure which shows an example of a voltage change when a temporary disconnection generate | occur | produces in the detection line L2 in time series. 検出線L2に断続的に複数回の断線が発生した場合の電圧変化の一例を時系列で示す図である。It is a figure which shows an example of a voltage change when the disconnection generate | occur | produces in the detection line L2 several times intermittently in time series. 検出線L2に継続して断線が発生した場合の電圧変化の一例を時系列で示す図である。It is a figure which shows an example of a voltage change when a disconnection generate | occur | produces continuously in the detection line L2 in time series.

以下、本発明の実施の形態を図面に基づき説明する。
図1は、本発明に係る組電池の異常検出装置が適用された電池モジュールの概略構成図である。なお、図1のC1〜C8は、電池セルを、L1〜L9は、検出線を、D1〜D8は、定電圧素子を、Ra1〜Ra9及びRb1〜Rb8は、抵抗素子を、SW1〜SW8は、スイッチング素子をそれぞれ表している。なお、図1は、電池セルC3から電池セルC6までを省略して記載している。
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic configuration diagram of a battery module to which an assembled battery abnormality detection device according to the present invention is applied. In FIG. 1, C1 to C8 are battery cells, L1 to L9 are detection lines, D1 to D8 are constant voltage elements, Ra1 to Ra9 and Rb1 to Rb8 are resistance elements, and SW1 to SW8 are SW1 to SW8. , Each represents a switching element. In FIG. 1, the battery cells C3 to C6 are omitted.

図1に示すように、組電池の異常検出装置が適用された電池モジュール1は、複数(例えば8個)の直列に配列された電池セルC1〜C8からなる組電池とセルモニタリングユニット2とで構成されている。ここに、電池セルC1〜C8は、充放電可能なリチウムイオン電池である。なお、本実施形態では、組電池の正極側の端に位置する電池セルC1を最上位セルとし、負極側の端に位置する電池セルC8を最下位セルとする。最上位セルは、電池セルC1〜C8の直列配列により電池モジュール1内での電位が最高となる側の電池セルであって、最下位セルは、電池セルC1〜C8の直列配列により電池モジュール1内での電位が最低となる側の電池セルを示している
セルモニタリングユニット2は、電圧計測部(断線判定手段、電圧検出手段)3と、複数の検出線L1〜L9と、複数の定電圧素子D1〜D8と、複数の抵抗素子Ra1〜Ra9と、複数の抵抗素子Rb1〜Rb8と、複数のスイッチング素子(電力断接手段)SW1〜SW8とで構成されている。
As shown in FIG. 1, a battery module 1 to which an abnormality detection device for a battery pack is applied includes a battery pack C1 to C8 arranged in series and a cell monitoring unit 2 (for example, eight). It is configured. Here, the battery cells C1 to C8 are chargeable / dischargeable lithium ion batteries. In the present embodiment, the battery cell C1 located at the positive electrode end of the assembled battery is the uppermost cell, and the battery cell C8 located at the negative electrode end is the lowest cell. The uppermost cell is the battery cell on the side where the potential in the battery module 1 is highest due to the series arrangement of the battery cells C1 to C8, and the lowest cell is the battery module 1 due to the series arrangement of the battery cells C1 to C8. The cell monitoring unit 2 shows the battery cell on the side having the lowest potential in the cell. The cell monitoring unit 2 includes a voltage measurement unit (disconnection determination unit, voltage detection unit) 3, a plurality of detection lines L1 to L9, and a plurality of constant voltages. It comprises elements D1 to D8, a plurality of resistance elements Ra1 to Ra9, a plurality of resistance elements Rb1 to Rb8, and a plurality of switching elements (power connection / disconnection means) SW1 to SW8.

抵抗素子Ra1〜Ra9は、検出線L1〜L9に各々直列に接続されている。
抵抗素子Rb1〜Rb8とスイッチング素子SW1〜SW8は、各々直列に接続されている。そして、直列に接続された抵抗素子Rb1〜Rb8とスイッチング素子SW1〜SW8は、検出線L1〜L9を介して、各々の電池セルC1〜C8に並列に接続されている。即ち、スイッチング素子SW1〜SW8がON(オン)されると、各スイッチング素子SW1〜SW8に対応する電池セルC1〜C8の放電が行われる。例えば、直列に接続された抵抗素子R1とスイッチング素子SW1は、検出線L1と検出線L2とを介して、電池セルC1と並列に接続されている。そして、スイッチング素子SW1がON(オン)されると、抵抗素子Rb1を介して、スイッチング素子SW1に対応する電池セルC1の放電が行われる。即ち、各々の電池セルC1〜C8の電圧にバラツキが生じた場合に、電圧の高い電池セルC1〜C8に対応するスイッチング素子SW1〜SW8をON(オン)にして放電を行うことで、各々の電池セルC1〜C8の電圧を均一にすることが可能となる。なお、スイッチング素子SW1〜SW8は、通常OFFであり、後述する電圧計測部3からの制御信号によりON(オン)されるものである。本実施の形態では、奇数側の電池セルC1,C3,C5,C7と並列に接続されるスイッチング素子SW1,SW3,SW5,SW7を奇数側スイッチング素子SW1,SW3,SW5,SW7といい、偶数側の電池セルC2,C4,C6,C8と並列に接続されるスイッチング素子SW2,SW4,SW6,SW8を偶数側スイッチング素子SW2,SW4,SW6,SW8という。
The resistance elements Ra1 to Ra9 are connected in series to the detection lines L1 to L9, respectively.
Resistance elements Rb1 to Rb8 and switching elements SW1 to SW8 are connected in series, respectively. The resistance elements Rb1 to Rb8 and the switching elements SW1 to SW8 connected in series are connected in parallel to the battery cells C1 to C8 via the detection lines L1 to L9. That is, when the switching elements SW1 to SW8 are turned on, the battery cells C1 to C8 corresponding to the switching elements SW1 to SW8 are discharged. For example, the resistance element R1 and the switching element SW1 connected in series are connected in parallel with the battery cell C1 via the detection line L1 and the detection line L2. When the switching element SW1 is turned on, the battery cell C1 corresponding to the switching element SW1 is discharged via the resistance element Rb1. That is, when variations occur in the voltages of the battery cells C1 to C8, the switching elements SW1 to SW8 corresponding to the high voltage battery cells C1 to C8 are turned on to perform discharge. It becomes possible to make the voltage of battery cell C1-C8 uniform. The switching elements SW1 to SW8 are normally OFF, and are turned ON by a control signal from the voltage measuring unit 3 described later. In the present embodiment, switching elements SW1, SW3, SW5, and SW7 connected in parallel with odd-numbered battery cells C1, C3, C5, and C7 are referred to as odd-numbered switching elements SW1, SW3, SW5, and SW7. Switching elements SW2, SW4, SW6, and SW8 connected in parallel with the battery cells C2, C4, C6, and C8 are referred to as even-numbered switching elements SW2, SW4, SW6, and SW8.

定電圧素子D1〜D8は、ツェナーダイオードである。そして、各々の定電圧素子D1〜D8は、検出線L1〜L9を介して、各々の電池セルC1〜C8に並列に接続されている。詳しくは、低電圧素子D1〜D8のカソードは、対応する電池セルC1〜C8の正極側に、アノードは、対応する電池セルC1〜C8の負極側に接続されている。
電圧計測部3は、検出線L1〜L9を介して各々の電池セルC1〜C8と接続されている。詳しくは、検出線L1は、最上位セルの正極側の端子、即ち電池セルC1の正極側の端子と電圧計測部3とを接続している。検出線L2は、最上位セルの負極側の端子と最上位セルより一段下位のセルの正極側の端子、即ち電池セルC1の負極側の端子と電池セルC2の正極側の端子と電圧計測部3とを接続している。検出線L3は、電池セルC2の負極側の端子と電池セルC3の正極側の端子と電圧計測部3とを接続している。検出線L4は、電池セルC3の負極側の端子と電池セルC4の正極側の端子と電圧計測部3とを接続している。検出線L5は、電池セルC4の負極側の端子と電池セルC5の正極側の端子と電圧計測部3とを接続している。検出線L6は、電池セルC5の負極側の端子と電池セルC6の正極側の端子と電圧計測部3とを接続している。検出線L7は、電池セルC6の負極側の端子と電池セルC7の正極側の端子と電圧計測部3とを接続している。検出線L8は、最下位セルの正極側の端子と最下位セルより一段上位のセルの負極側の端子、即ち電池セルC8の正極側の端子と電池セルC7の負極側の端子と電圧計測部3とを接続している。検出線L9は、最下位セルの負極側の端子、即ち電池セルC8の負極側の端子と電圧計測部3とを接続している。
The constant voltage elements D1 to D8 are Zener diodes. And each constant voltage element D1-D8 is connected in parallel with each battery cell C1-C8 via the detection line L1-L9. Specifically, the cathodes of the low voltage elements D1 to D8 are connected to the positive side of the corresponding battery cells C1 to C8, and the anodes are connected to the negative side of the corresponding battery cells C1 to C8.
The voltage measurement unit 3 is connected to each of the battery cells C1 to C8 via detection lines L1 to L9. Specifically, the detection line L1 connects the positive electrode side terminal of the uppermost cell, that is, the positive electrode side terminal of the battery cell C1 and the voltage measuring unit 3. The detection line L2 includes a negative electrode terminal of the uppermost cell and a positive electrode terminal of a cell one step lower than the uppermost cell, that is, a negative electrode terminal of the battery cell C1, a positive electrode terminal of the battery cell C2, and a voltage measurement unit. 3 is connected. The detection line L3 connects the negative electrode side terminal of the battery cell C2, the positive electrode side terminal of the battery cell C3, and the voltage measuring unit 3. The detection line L4 connects the negative electrode side terminal of the battery cell C3, the positive electrode side terminal of the battery cell C4, and the voltage measurement unit 3. The detection line L5 connects the negative electrode side terminal of the battery cell C4, the positive electrode side terminal of the battery cell C5, and the voltage measurement unit 3. The detection line L6 connects the negative electrode side terminal of the battery cell C5, the positive electrode side terminal of the battery cell C6, and the voltage measurement unit 3. The detection line L7 connects the negative electrode side terminal of the battery cell C6, the positive electrode side terminal of the battery cell C7, and the voltage measuring unit 3. The detection line L8 includes a positive electrode terminal of the lowest cell, a negative electrode terminal of a cell one level higher than the lowest cell, that is, a positive electrode terminal of the battery cell C8, a negative electrode terminal of the battery cell C7, and a voltage measurement unit. 3 is connected. The detection line L9 connects the negative electrode side terminal of the lowest cell, that is, the negative electrode side terminal of the battery cell C8, and the voltage measuring unit 3.

また、一方で、電圧計測部3は、複数の電池モジュール1を備えた電池パックに備わる図示しないバッテリモニタリングユニット等とコントローラー・エリア・ネットワーク等の信号線4を介して接続されている。
そして、電圧計測部3は、各々の電池セルC1〜C8の電圧を測定可能なように構成されている。詳しくは、電圧計測部3は、検出線L1と検出線L2間の電圧、即ち、電池セルC1の電圧と、検出線L2と検出線L3間の電圧、即ち、電池セルC2の電圧と、検出線L3と検出線L4間の電圧、即ち、電池セルC3の電圧と、検出線L4と検出線L5間の電圧、即ち、電池セルC4の電圧と、検出線L5と検出線L6間の電圧、即ち、電池セルC5の電圧と、検出線L6と検出線L7間の電圧、即ち、電池セルC6の電圧と、検出線L7と検出線L8間の電圧、即ち、電池セルC7の電圧と、検出線L8と検出線L9間の電圧、即ち、電池セルC8の電圧を検出し、各々の電圧を送信値としてバッテリモニタリングユニット等に送信する。なお、電圧計測部3では、各々の電池セルC1〜C8の電圧を常時測定している。
On the other hand, the voltage measuring unit 3 is connected to a battery monitoring unit (not shown) provided in a battery pack including a plurality of battery modules 1 via a signal line 4 such as a controller area network.
And the voltage measurement part 3 is comprised so that the voltage of each battery cell C1-C8 can be measured. Specifically, the voltage measuring unit 3 detects the voltage between the detection line L1 and the detection line L2, that is, the voltage of the battery cell C1, and the voltage between the detection line L2 and the detection line L3, that is, the voltage of the battery cell C2. The voltage between the line L3 and the detection line L4, that is, the voltage of the battery cell C3, the voltage between the detection line L4 and the detection line L5, that is, the voltage of the battery cell C4, and the voltage between the detection line L5 and the detection line L6. That is, the voltage of the battery cell C5, the voltage between the detection line L6 and the detection line L7, that is, the voltage of the battery cell C6, the voltage between the detection line L7 and the detection line L8, that is, the voltage of the battery cell C7, and the detection The voltage between the line L8 and the detection line L9, that is, the voltage of the battery cell C8 is detected, and each voltage is transmitted as a transmission value to a battery monitoring unit or the like. In addition, in the voltage measurement part 3, the voltage of each battery cell C1-C8 is always measured.

また、電圧計測部3は、奇数側スイッチング素子SW1,SW3,SW5,SW7と偶数側スイッチング素子SW2,SW4,SW6,SW8とを交互に断接し、各々の検出線L1〜L9間の電圧に基づいて、各々の検出線L1〜L9の断線を検出する断線検出制御を行う。そして、電圧計測部3は、断線検出制御において、検出線L1〜L9のいずれかに断線が検出されると、当該検出線の断線の度合いに応じて、前回のスイッチング素子SW1〜SW8の断接前に記憶した当該電池セルの電圧、或いは予め設定されているフェールセーフ値を送信値としてバッテリモニタリングユニット等に送信する。   The voltage measuring unit 3 alternately connects and disconnects the odd-numbered switching elements SW1, SW3, SW5, and SW7 and the even-numbered switching elements SW2, SW4, SW6, and SW8, and based on the voltage between the detection lines L1 to L9. Then, disconnection detection control for detecting disconnection of each of the detection lines L1 to L9 is performed. Then, in the disconnection detection control, when the disconnection is detected in any of the detection lines L1 to L9, the voltage measuring unit 3 connects or disconnects the previous switching elements SW1 to SW8 according to the degree of disconnection of the detection line. The previously stored voltage of the battery cell or a preset fail safe value is transmitted as a transmission value to a battery monitoring unit or the like.

なお、電圧計測部3の断線検出制御では、奇数側スイッチング素子SW1,SW3,SW5,SW7、或いは偶数側スイッチング素子SW2,SW4,SW6,SW8がON(オン)された時に、電池セルC1〜C8の電圧のいずれかが第1閾値(本発明の所定閾値に相当)L未満であると、当該電池セルの電圧を検出する二本の検出線のいずれかに断線があると判定する。そして、断線の検出された電池セルの上位側或いは下位側の電池セルのいずれかの電圧が第3閾値H2以上で、且つ第2閾値H1未満の判定範囲(本発明の所定範囲に相当)内にある場合には、電圧が第1閾値L未満である電池セルに接続される検出線のうち、電圧が当該判定範囲内である電池セル側でない側の検出線、即ち、当該判定範囲内である電池セルに接続されていない検出線の断線と判定する。また、電池セルC1〜C8の電圧のいずれかが第1閾値L未満である場合に、断線の検出された電池セルの上位側或いは下位側の電池セルのいずれかの電圧が第4閾値H3より大きいと、電圧が第1閾値L未満である電池セルの検出線のうち、電圧が第4閾値H3より大きい電池セル側の検出線、即ち第4閾値H3より大きい電池セルに接続される検出線の断線と判定する。なお、第1閾値Lは、0(ゼロ)より大きい0(ゼロ)近傍の値に設定される。そして、第2閾値H1は、第1閾値Lよりも大きく、電池セルの定格電圧より電圧計測部3の内部抵抗等による電圧降下分だけ小さな値に設定される。また、第3閾値H2は、第2閾値H1よりも小さい値に設定される。そして、第4閾値H3は、判定範囲より高い値であって、2個の電池セルを直列に接続した場合に発生する電圧に達しない値に設定される。   In the disconnection detection control of the voltage measuring unit 3, when the odd-numbered switching elements SW1, SW3, SW5, SW7 or the even-numbered switching elements SW2, SW4, SW6, SW8 are turned on, the battery cells C1 to C8 are turned on. If any one of the voltages is less than the first threshold (corresponding to the predetermined threshold of the present invention) L, it is determined that one of the two detection lines for detecting the voltage of the battery cell is broken. And, within the determination range (corresponding to the predetermined range of the present invention) in which the voltage of the battery cell on the upper side or the lower side of the battery cell in which the disconnection is detected is not less than the third threshold value H2 and less than the second threshold value H1. Among the detection lines connected to the battery cell whose voltage is less than the first threshold value L, the detection line on the side of the voltage that is not within the determination range, that is, the battery cell side, that is, within the determination range. It is determined that a detection line that is not connected to a battery cell is disconnected. In addition, when any of the voltages of the battery cells C1 to C8 is less than the first threshold value L, the voltage of the battery cell on the upper side or the lower side of the battery cell in which the disconnection is detected is higher than the fourth threshold value H3. If larger, among the detection lines of the battery cells whose voltage is less than the first threshold L, the detection line connected to the battery cell side detection line whose voltage is greater than the fourth threshold H3, that is, the battery cell greater than the fourth threshold H3. It is determined that the wire is disconnected. The first threshold L is set to a value near 0 (zero) that is greater than 0 (zero). The second threshold value H1 is set to a value that is larger than the first threshold value L and smaller than the rated voltage of the battery cell by a voltage drop due to the internal resistance of the voltage measuring unit 3 or the like. The third threshold value H2 is set to a value smaller than the second threshold value H1. The fourth threshold value H3 is set to a value that is higher than the determination range and does not reach the voltage generated when two battery cells are connected in series.

以下、このように構成された本発明に係る組電池の異常検出装置が適用された電池モジュール1の断線検出制御について説明する。なお、本制御は、常時実行される。
図2は、セルモニタリングユニット2にて実施される断線検出制御のフローチャートである。図3は、検出線L1の断線時に、偶数側スイッチング素子をONとしたときの電流の流れを、図4は、検出線L1の断線時に、奇数側スイッチング素子をONとしたときの電流の流れを示す図である。図5は、検出線L1に一時的な断線が発生した場合の、図6は、検出線L1に断続的に複数回の断線が発生した場合の、図7は、検出線L1に継続して断線が発生した場合の電圧変化の一例を時系列で示す図である。また、図8は、検出線L2の断線時に、偶数側スイッチング素子をONとしたときの電流の流れを、図9は、検出線L2の断線時に、奇数側スイッチング素子をONとしたときの電流の流れを示す図である。そして、図10は、検出線L2に一時的な断線が発生した場合の、図11は、検出線L2に断続的に複数回の断線が発生した場合の、図12は、検出線L2に継続して断線が発生した場合の電圧変化の一例を時系列で示す図である。図5〜図7及び図10〜図12の上段より偶数セル群のON/OFF、奇数セル群のON/OFF、検出線の断線状態、電池セル電圧、隣接電池セル電圧、バッテリモニタリングユニット等への送信値を示している。なお、偶数セル群は、偶数側スイッチング素子SW2,SW4,SW6,SW8を示している。そして、奇数セル群は、奇数側スイッチング素子SW1,SW3,SW5,SW7を示している。また、図3及び4、或いは図8及び9のように検出線L1或いは検出線L2において断線が発生した場合の図5〜図7の断線状態は、検出線L1の断線状態を表しており、図10〜図12の断線状態は、検出線L2の断線状態を表している。そして、図3及び図4、或いは図8及び図9のように検出線L1或いは検出線L2において断線が発生した場合の図5〜図7中及び図10〜図12中の電池セル電圧は、電池セルC1の電圧を表しており、隣接セル電圧は、電池セルC2の電圧を表している。
Hereinafter, the disconnection detection control of the battery module 1 to which the assembled battery abnormality detection device according to the present invention configured as described above is applied will be described. This control is always executed.
FIG. 2 is a flowchart of disconnection detection control performed by the cell monitoring unit 2. 3 shows the current flow when the even-numbered switching element is turned on when the detection line L1 is disconnected, and FIG. 4 shows the current flow when the odd-numbered switching element is turned on when the detection line L1 is disconnected. FIG. 5 shows a case where a temporary disconnection occurs in the detection line L1, FIG. 6 shows a case where a plurality of disconnections occur intermittently in the detection line L1, and FIG. 7 continues to the detection line L1. It is a figure which shows an example of the voltage change when a disconnection generate | occur | produces in time series. 8 shows the flow of current when the even-numbered switching element is turned on when the detection line L2 is disconnected, and FIG. 9 shows the current flow when the odd-numbered switching element is turned on when the detection line L2 is disconnected. It is a figure which shows the flow of. 10 shows a case where a temporary disconnection occurs on the detection line L2, FIG. 11 shows a case where a plurality of disconnections occur intermittently on the detection line L2, and FIG. 12 continues on the detection line L2. It is a figure which shows an example of a voltage change when a disconnection generate | occur | produces in time series. 5 to 7 and 10 to 12, the even cell group ON / OFF, odd cell group ON / OFF, detection line disconnection state, battery cell voltage, adjacent battery cell voltage, battery monitoring unit, etc. Indicates the transmission value. Note that the even-numbered cell group indicates the even-numbered side switching elements SW2, SW4, SW6, and SW8. The odd-numbered cell group indicates odd-numbered switching elements SW1, SW3, SW5, and SW7. Moreover, the disconnection state of FIGS. 5-7 when the disconnection occurs in the detection line L1 or the detection line L2 as shown in FIGS. 3 and 4 or FIGS. 8 and 9 represents the disconnection state of the detection line L1. The disconnection state of FIGS. 10-12 represents the disconnection state of the detection line L2. The battery cell voltages in FIGS. 5 to 7 and FIGS. 10 to 12 when the disconnection occurs in the detection line L1 or the detection line L2 as shown in FIG. 3 and FIG. 4 or FIG. 8 and FIG. The voltage of the battery cell C1 is represented, and the adjacent cell voltage represents the voltage of the battery cell C2.

図2に示すように、ステップS10では、各々の電池セルC1〜C8の電圧を記憶する。詳しくは、偶数側スイッチング素子SW2,SW4,SW6,SW8、或いは、奇数側スイッチング素子SW1,SW3,SW5,SW7の作動前の各々の電池セルC1〜C8の電圧を記憶する。そして、ステップS12に進む。
ステップS12では、図5〜図7及び図10〜図12の(1)〜(4)に示すように、スイッチング素子を作動させる。詳しくは、図5〜図7、或いは図10〜図12に示すように、偶数側スイッチング素子SW2,SW4,SW6,SW8、或いは、奇数側スイッチング素子SW1,SW3,SW5,SW7のいずれかをON(オン)とする。そして、ステップS14に進む。なお、次回のスイッチング素子の作動時には、今回作動させた側でない側のスイッチング素子をON(オン)とする。例えば、今回、偶数側スイッチング素子SW2,SW4,SW6,SW8をON(オン)とした場合には、次回は、奇数側スイッチング素子SW1,SW3,SW5,SW7をON(オン)とする。即ち、偶数側スイッチング素子SW2,SW4,SW6,SW8と奇数側スイッチング素子SW1,SW3,SW5,SW7とを所定期間毎に交互にON(オン)させる。
As shown in FIG. 2, in step S10, the voltage of each battery cell C1-C8 is memorize | stored. Specifically, the voltages of the battery cells C1 to C8 before operation of the even-numbered switching elements SW2, SW4, SW6, SW8 or the odd-numbered switching elements SW1, SW3, SW5, SW7 are stored. Then, the process proceeds to step S12.
In step S12, the switching element is actuated as shown in FIGS. 5 to 7 and FIGS. 10 to 12 (1) to (4). Specifically, as shown in FIG. 5 to FIG. 7 or FIG. 10 to FIG. 12, either the even-numbered side switching elements SW2, SW4, SW6, SW8 or the odd-numbered side switching elements SW1, SW3, SW5, SW7 are turned on. (On). Then, the process proceeds to step S14. When the switching element is operated next time, the switching element on the side that is not operated this time is turned ON. For example, when the even-numbered switching elements SW2, SW4, SW6, and SW8 are turned on this time, the odd-numbered switching elements SW1, SW3, SW5, and SW7 are turned on next time. That is, the even-numbered switching elements SW2, SW4, SW6, and SW8 and the odd-numbered switching elements SW1, SW3, SW5, and SW7 are alternately turned on at predetermined intervals.

ステップS14では、電圧が第1閾値L未満か、否かを判別する。詳しくは、各々の電池セルC1〜C8の電圧について、第1閾値L未満か、否かを判別する。判別結果が真(Yes)で、電池セルC1〜C8のいずれかにおいて電圧が第1閾値L未満であれば、ステップS16に進む。また、偽(No)で、電池セルC1〜C8のいずれかにおいても電圧が第1閾値L以上であれば、ステップS30に進む。   In step S14, it is determined whether or not the voltage is less than a first threshold value L. Specifically, it is determined whether or not the voltage of each of the battery cells C1 to C8 is less than the first threshold value L. If the determination result is true (Yes) and the voltage is less than the first threshold L in any of the battery cells C1 to C8, the process proceeds to step S16. If it is false (No) and the voltage is greater than or equal to the first threshold value L in any of the battery cells C1 to C8, the process proceeds to step S30.

ステップS16では、隣接セルの電圧が第3閾値H2以上で、且つ第2閾値H1未満の判定範囲内にあるか、否かを判別する。詳しくは、電圧が第1閾値L未満である電池セルに隣接する電池セルの電圧が第3閾値H2以上で、且つ第2閾値H1未満の判定範囲内にあるか、否かを判別する。判別結果が真(Yes)で、電圧が第1閾値L未満である電池セルに隣接する電池セルの電圧が第3閾値H2以上で、且つ第2閾値H1未満の判定範囲内であれば、ステップS20に進む。また、偽(No)で、電圧が第1閾値L未満である電池セルに隣接する電池セルの電圧が第3閾値H2以上で、且つ第2閾値H1未満の判定範囲内でなければ、ステップS18に進む。なお、電圧が第1閾値L未満である電池セルが電池セルC1である場合には、隣接する電池セルは、電池セルC2となり、電圧が第1閾値L未満である電池セルが電池セルC2である場合には、隣接する電池セルは、電池セルC1及び電池セルC3となる。   In step S16, it is determined whether or not the voltage of the adjacent cell is within a determination range that is equal to or higher than the third threshold H2 and lower than the second threshold H1. Specifically, it is determined whether or not the voltage of the battery cell adjacent to the battery cell whose voltage is less than the first threshold value L is not less than the third threshold value H2 and within the determination range less than the second threshold value H1. If the determination result is true (Yes) and the voltage of the battery cell adjacent to the battery cell whose voltage is less than the first threshold value L is greater than or equal to the third threshold value H2 and less than the second threshold value H1, the step Proceed to S20. Further, if it is false (No) and the voltage of the battery cell adjacent to the battery cell whose voltage is less than the first threshold value L is not less than the third threshold value H2 and not within the determination range less than the second threshold value H1, step S18 is performed. Proceed to When the battery cell whose voltage is less than the first threshold L is the battery cell C1, the adjacent battery cell is the battery cell C2, and the battery cell whose voltage is less than the first threshold L is the battery cell C2. In some cases, the adjacent battery cells are the battery cell C1 and the battery cell C3.

ステップS18では、電池セルの隣接セル側の検出線の断線と判定する。詳しくは、電圧が第1閾値L未満である電池セルに隣接する電池セルのうち、電池セルの電圧が第4閾値H3より高い電池セル側の検出線の断線と判定する。例えば、電圧が第1閾値L未満である電池セルが電池セルC1であり、隣接する電池セルC2の電圧が第4閾値H3より高い場合には、検出線L2の断線と判定する。また、電圧が第1閾値L未満である電池セルが電池セルC2であり、隣接する電池セルC1の電圧が第4閾値H3より高く、そして、隣接する電池セルC3の電圧が第4閾値H3以下である場合には、検出線L2の断線と判定する。そして、ステップS22に進む。   In step S18, it is determined that the detection line on the adjacent cell side of the battery cell is disconnected. Specifically, among the battery cells adjacent to the battery cell whose voltage is less than the first threshold L, it is determined that the detection line on the battery cell side has a voltage higher than the fourth threshold H3. For example, when the battery cell whose voltage is less than the first threshold L is the battery cell C1, and the voltage of the adjacent battery cell C2 is higher than the fourth threshold H3, it is determined that the detection line L2 is disconnected. In addition, the battery cell whose voltage is less than the first threshold L is the battery cell C2, the voltage of the adjacent battery cell C1 is higher than the fourth threshold H3, and the voltage of the adjacent battery cell C3 is equal to or lower than the fourth threshold H3. If it is, it is determined that the detection line L2 is disconnected. Then, the process proceeds to step S22.

一方で、ステップS20では、電池セルの隣接セル側でない側の検出線の断線と判定する。詳しくは、電圧が第1閾値L未満である電池セルに隣接する電池セルのうち、電池セルの電圧が第3閾値H2以上で、且つ第2閾値H1未満の判定範囲内にある電池セル側でない側の検出線の断線と判定する。例えば、電圧が第1閾値L未満である電池セルが電池セルC1であり、隣接する電池セルC2の電圧が第3閾値H2以上で、且つ第2閾値H1未満の判定範囲内にある場合には、検出線L1の断線と判定する。また、電圧が第1閾値L未満である電池セルが電池セルC8であり、隣接する電池セルC7の電圧が第3閾値H2以上で、且つ第2閾値H1未満の判定範囲内にある場合には、検出線L9の断線と判定する。そして、ステップS22に進む。なお、電池モジュール1の回路及びスイッチング素子SW1〜SW8の作動により、電池セルC1或いは電池セルC8の電圧が第1閾値L未満である場合のみ、ステップS16から本ステップへ移行されることになる。   On the other hand, in step S20, it is determined that the detection line on the side other than the adjacent cell side of the battery cell is disconnected. Specifically, among the battery cells adjacent to the battery cell whose voltage is less than the first threshold L, the battery cell is not on the battery cell side whose voltage is equal to or higher than the third threshold H2 and within the determination range less than the second threshold H1. It is determined that the detection line on the side is broken. For example, when the battery cell whose voltage is less than the first threshold L is the battery cell C1, and the voltage of the adjacent battery cell C2 is equal to or higher than the third threshold H2 and within the determination range less than the second threshold H1. It is determined that the detection line L1 is disconnected. Further, when the battery cell whose voltage is less than the first threshold L is the battery cell C8, and the voltage of the adjacent battery cell C7 is equal to or higher than the third threshold H2 and within the determination range less than the second threshold H1. It is determined that the detection line L9 is disconnected. Then, the process proceeds to step S22. Note that, only when the voltage of the battery cell C1 or the battery cell C8 is less than the first threshold L by the operation of the circuit of the battery module 1 and the switching elements SW1 to SW8, the process proceeds from step S16 to this step.

ステップS22では、故障フラグをセットする。詳しくは、次回以降の本制御実施時に故障有りの履歴を示すための故障フラグをセットする。そして、ステップS24に進む。
ステップS24では、2回連続の故障フラグ発生か、否かを判別する。判別結果が真(Yes)で2回連続の故障フラグ発生であれば、ステップS26に進む。また、偽(No)で2回連続の故障フラグ発生でなければ、ステップS28に進む。
In step S22, a failure flag is set. Specifically, a failure flag is set to indicate a history of failure when the present control is executed next time. Then, the process proceeds to step S24.
In step S24, it is determined whether or not two consecutive failure flags have occurred. If the determination result is true (Yes) and two consecutive failure flags are generated, the process proceeds to step S26. On the other hand, if it is false (No) and the failure flag is not continuously generated twice, the process proceeds to step S28.

ステップS26では、フェールセーフ値を送信する。詳しくは、図6及び図7の(6)と図11及び図12の(6)に示すように、断線の検出された検出線に対応する電池セルの電圧をフェールセーフ値に置き換えて、バッテリモニタリングユニット等に送信する。そして、本ルーチンをリターンする。
一方で、ステップS28では、記憶した電圧を送信する。詳しくは、図5〜図7の(5)と図10〜図12の(5)に示すように、断線の検出された検出線に対応する電池セルの電圧をステップS10にて記憶した電圧に置き換えて、バッテリモニタリングユニット等に送信する。そして、本ルーチンをリターンする。
In step S26, a fail safe value is transmitted. Specifically, as shown in FIGS. 6 and 7 (6) and FIGS. 11 and 12 (6), the battery cell voltage corresponding to the detected detection line is replaced with a fail-safe value, so that the battery Send to the monitoring unit. Then, this routine is returned.
On the other hand, in step S28, the stored voltage is transmitted. Specifically, as shown in FIGS. 5 to 7 (5) and FIGS. 10 to 12 (5), the voltage of the battery cell corresponding to the detection line where the disconnection is detected is set to the voltage stored in step S10. Replace it and send it to the battery monitoring unit. Then, this routine is returned.

また、ステップS30では、故障フラグをリセットする。そして、ステップS32に進む。
ステップS32では、最新の電圧を送信する。詳しくは、図5及び図6の(7)と図10及び図11の(7)に示すように、全ての電池セルC1〜C8の最新の電圧をバッテリモニタリングユニット等に送信する。そして、本ルーチンをリターンする。
In step S30, the failure flag is reset. Then, the process proceeds to step S32.
In step S32, the latest voltage is transmitted. Specifically, as shown in FIGS. 5 and 6 (7) and FIGS. 10 and 11 (7), the latest voltages of all the battery cells C1 to C8 are transmitted to the battery monitoring unit or the like. Then, this routine is returned.

以下に、組電池の異常検出装置が適用された電池モジュール1での断線検出について説明する。なお、本説明では、電池セルC1〜C8の定格電圧を4Vとして説明する。
図3及び図4に示すように、例えば、組電池の最上位側の電池セルC1(本発明の第1電池セルに相当)の正極に接続する検出線L1に図5〜図7に示すように一時的、或いは断続的に複数回、或いは継続して断線が発生しているような場合に、図3と、図5及び図6の(a)と、図7の(a)及び(c)とに示すように偶数側スイッチング素子SW2,SW4,SW6,SW8をONとすると、電圧計測部3にて検出される検出線L1と検出線L2との間の電圧、即ち電池セルC1の電圧は、ほぼ0(V)となる。そして、検出線L2と検出線L3との間の電圧、即ち、電池セルC2(本発明の第2電池セルに相当)の電圧は、電圧計測部3の内部抵抗等により電圧降下Vf(V)があることから4−Vf(V)となる。また、図4と、図6の(b)と、図7の(b)及び(d)とに示すように奇数側スイッチング素子SW1,SW3,SW5,SW7をONとすると、電圧計測部3にて検出される検出線L1と検出線L2との間の電圧は、ほぼ0(V)となる。そして、検出線L2と検出線L3との間の電圧は、電圧計測部3の内部抵抗等により電圧降下Vf(V)があることから4−Vf(V)となる。また、例えば、組電池の最下位側の電池セルC8の負極に接続する検出線L9に、同様に一時的、或いは断続的に複数回、或いは継続して断線するような場合であっても、偶数側スイッチング素子SW2,SW4,SW6,SW8をONとすると、電圧計測部3にて検出される検出線L8と検出線L9との間の電圧は、ほぼ0(V)となる。そして、検出線L7と検出線L8との間の電圧は、電圧計測部3の内部抵抗等により電圧降下Vf(V)があることから4−Vf(V)となる。また、奇数側スイッチング素子SW1,SW3,SW5,SW7をONとすると、電圧計測部3にて検出される検出線L8と検出線L9との間の電圧は、ほぼ0(V)となる。そして、検出線L7と検出線L8との間の電圧は、電圧計測部3の内部抵抗等により電圧降下Vf(V)があることから4−Vf(V)となる。
Hereinafter, disconnection detection in the battery module 1 to which the assembled battery abnormality detection device is applied will be described. In this description, the rated voltage of the battery cells C1 to C8 is assumed to be 4V.
As shown in FIGS. 3 and 4, for example, the detection line L1 connected to the positive electrode of the battery cell C1 on the uppermost side of the assembled battery (corresponding to the first battery cell of the present invention) is shown in FIGS. 3, FIG. 5, FIG. 6 (a), and FIG. 7 (a) and (c), when the disconnection occurs temporarily or intermittently several times or continuously. ), When the even-numbered switching elements SW2, SW4, SW6, SW8 are turned on, the voltage between the detection line L1 and the detection line L2 detected by the voltage measuring unit 3, that is, the voltage of the battery cell C1 Becomes substantially 0 (V). The voltage between the detection line L2 and the detection line L3, that is, the voltage of the battery cell C2 (corresponding to the second battery cell of the present invention) is a voltage drop Vf (V) due to the internal resistance of the voltage measuring unit 3 or the like. Therefore, it becomes 4-Vf (V). When the odd-numbered switching elements SW1, SW3, SW5, and SW7 are turned on as shown in FIGS. 4, (b) in FIG. 6, and (b) and (d) in FIG. The voltage between the detection line L1 and the detection line L2 detected in this manner is almost 0 (V). The voltage between the detection line L2 and the detection line L3 becomes 4-Vf (V) because there is a voltage drop Vf (V) due to the internal resistance of the voltage measuring unit 3 or the like. In addition, for example, even in the case where the detection line L9 connected to the negative electrode of the battery cell C8 on the lowermost side of the assembled battery is similarly temporarily or intermittently multiple times or continuously disconnected, When the even-numbered switching elements SW2, SW4, SW6, and SW8 are turned on, the voltage between the detection line L8 and the detection line L9 detected by the voltage measuring unit 3 is substantially 0 (V). The voltage between the detection line L7 and the detection line L8 is 4-Vf (V) because there is a voltage drop Vf (V) due to the internal resistance of the voltage measuring unit 3 or the like. When the odd-numbered switching elements SW1, SW3, SW5, and SW7 are turned on, the voltage between the detection line L8 and the detection line L9 detected by the voltage measuring unit 3 is substantially 0 (V). The voltage between the detection line L7 and the detection line L8 is 4-Vf (V) because there is a voltage drop Vf (V) due to the internal resistance of the voltage measuring unit 3 or the like.

即ち、組電池の最上位側の電池セルC1の正極に接続する検出線L1、或いは最下位側の電池セルC8の負極に接続する検出線L9に断線がある場合には、偶数側スイッチング素子SW2,SW4,SW6,SW8、或いは奇数側スイッチング素子SW1,SW3,SW5,SW7をONとすることで、断線のある検出線が接続される電池セルの電圧は、約0Vとなる。そして、断線のある検出線が接続される電池セルに隣接し、且つ断線のある検出線が接続されない電池セルの電圧は、電池セルの定格電圧から電圧計測部3の内部抵抗等による電圧降下を考慮した値となる。   That is, when the detection line L1 connected to the positive electrode of the battery cell C1 on the uppermost side of the assembled battery or the detection line L9 connected to the negative electrode of the battery cell C8 on the lowermost side has a disconnection, the even-numbered side switching element SW2 , SW4, SW6, SW8 or odd-numbered switching elements SW1, SW3, SW5, SW7 are turned on, so that the voltage of the battery cell to which the detection line with the disconnection is connected becomes about 0V. The voltage of the battery cell adjacent to the battery cell to which the broken detection line is connected and not connected to the broken detection line is reduced from the rated voltage of the battery cell due to the internal resistance of the voltage measuring unit 3 or the like. It is a value that takes into account.

また、図8及び図9に示すように、検出線L2のような、最上位側の電池セルC1の正極に接続する検出線L1、或いは最下位側の電池セルC8の負極に接続する検出線L9以外の検出線L2〜L8に、図10〜図12に示すように一時的、或いは断続的に複数回、或いは継続して断線が発生しているような場合に、図8と、図10及び図11の(a)と、図12の(a)及び(c)とに示すように偶数側スイッチング素子SW2,SW4,SW6,SW8をONとすると、例えば、検出線L2に断線が発生しているような場合には、電圧計測部3にて検出される検出線L1と検出線L2との間の電圧、即ち電池セルC1の電圧は、電池セルC1と電池セルC2の直列接続により約8(V)となる。そして、検出線L2と検出線L3との間の電圧、即ち、電池セルC2の電圧は、ほぼ0(V)となる。また、検出線L3と検出線L4との間の電圧、即ち、電池セルC3の電圧は、4(V)となる。そして、同様に図9と、図11の(b)と、図12の(b)及び(d)とに示すように奇数側スイッチング素子SW1,SW3,SW5,SW7をONとすると、例えば、検出線L2に断線が発生しているような場合には、電圧計測部3にて検出される検出線L1と検出線L2との間の電圧は、ほぼ0(V)となる。そして、検出線L2と検出線L3との間の電圧は、電池セルC1と電池セルC2の直列接続により約8(V)となる。また、検出線L3と検出線L4との間の電圧は、4(V)となる。   Further, as shown in FIGS. 8 and 9, the detection line L1 connected to the positive electrode of the uppermost battery cell C1, such as the detection line L2, or the detection line connected to the negative electrode of the lowermost battery cell C8. When the detection lines L2 to L8 other than L9 are disconnected temporarily or intermittently a plurality of times or continuously as shown in FIGS. When the even-numbered switching elements SW2, SW4, SW6, SW8 are turned on as shown in (a) of FIG. 11 and (a) and (c) of FIG. 12, for example, a disconnection occurs in the detection line L2. In such a case, the voltage between the detection line L1 and the detection line L2 detected by the voltage measuring unit 3, that is, the voltage of the battery cell C1 is approximately equal to the series connection of the battery cell C1 and the battery cell C2. 8 (V). The voltage between the detection line L2 and the detection line L3, that is, the voltage of the battery cell C2 is substantially 0 (V). Further, the voltage between the detection line L3 and the detection line L4, that is, the voltage of the battery cell C3 is 4 (V). Similarly, when odd-numbered switching elements SW1, SW3, SW5, and SW7 are turned on as shown in FIG. 9, FIG. 11B, and FIG. 12B and FIG. When a disconnection occurs in the line L2, the voltage between the detection line L1 and the detection line L2 detected by the voltage measuring unit 3 is substantially 0 (V). The voltage between the detection line L2 and the detection line L3 is about 8 (V) due to the series connection of the battery cell C1 and the battery cell C2. Further, the voltage between the detection line L3 and the detection line L4 is 4 (V).

即ち、最上位側の電池セルC1の正極に接続する検出線L1、或いは最下位側の電池セルC8の負極に接続する検出線L9以外の検出線L2〜L8に断線がある場合には、偶数側スイッチング素子SW2,SW4,SW6,SW8、或いは奇数側スイッチング素子SW1,SW3,SW5,SW7をONとすることで、断線のある検出線が接続される電池セルの電圧が0V或いは2個の電池セルを直列に接続した場合に発生する電圧となる。   That is, even when the detection line L1 connected to the positive electrode of the uppermost battery cell C1 or the detection lines L2 to L8 other than the detection line L9 connected to the negative electrode of the lowermost battery cell C8 is disconnected, an even number By turning on the side switching elements SW2, SW4, SW6, SW8, or the odd number side switching elements SW1, SW3, SW5, SW7, the voltage of the battery cell to which the detection line with the disconnection is connected is 0V or two batteries This voltage is generated when cells are connected in series.

したがって、第1閾値Lを0近傍の値とし、第2閾値H1及び第3閾値H2を第4閾値H3より小さく、且つ電池セルの定格電圧より電圧計測部3の内部抵抗等による電圧降下を減算した値よりも小さい値とすることで、本断線検出制御のステップS14とステップS16での判別にて、最上位電池セルC1の正極、或いは最下位電池セルC8の負極に接続する検出線L1或いは検出線L9の断線を判別することができる。また、第1閾値Lを0近傍の値とし、第4閾値H3を2個の電池セルを直列に接続した場合に発生する電圧に達しない近傍の値とすることで、本断線検出制御のステップS14とステップS16とステップS18にて、最上位電池セルC1の正極、或いは最下位電池セルC8の負極に接続する検出線L1或いは検出線L9以外の検出線L2〜L8の断線を判別することができる。   Therefore, the first threshold value L is a value near 0, the second threshold value H1 and the third threshold value H2 are smaller than the fourth threshold value H3, and the voltage drop due to the internal resistance of the voltage measuring unit 3 is subtracted from the rated voltage of the battery cell. By making the value smaller than the determined value, the detection line L1 connected to the positive electrode of the uppermost battery cell C1 or the negative electrode of the lowermost battery cell C8 in the discrimination in step S14 and step S16 of this disconnection detection control. The disconnection of the detection line L9 can be determined. Further, the first threshold value L is set to a value in the vicinity of 0, and the fourth threshold value H3 is set to a value in the vicinity that does not reach the voltage generated when two battery cells are connected in series. In S14, step S16, and step S18, it is possible to determine disconnection of the detection lines L2 to L8 other than the detection line L1 or the detection line L9 connected to the positive electrode of the uppermost battery cell C1 or the negative electrode of the lowermost battery cell C8. it can.

よって、検出線L1〜L9のいずれに断線があるかを検出することができる。   Therefore, it is possible to detect which of the detection lines L1 to L9 is disconnected.

1 電池モジュール
2 セルモニタリングユニット
3 電圧計測部(断線判定手段、電圧検出手段)
C1〜C8 電池セル
L1〜L9 検出線
SW1〜SW8 スイッチング素子(電力断接手段)
DESCRIPTION OF SYMBOLS 1 Battery module 2 Cell monitoring unit 3 Voltage measurement part (disconnection determination means, voltage detection means)
C1-C8 battery cell L1-L9 detection line SW1-SW8 switching element (power connection / disconnection means)

Claims (4)

直列に接続された複数の電池セルと、
前記複数の電池セルの各々の正極及び負極に一対の検出線を介して並列に接続され、各々の前記電池セルの電圧を検出する電圧検出手段と、
前記複数の電池セルの各々の正極及び負極に前記一対の検出線を介して並列に接続され電力を断接する電力断接手段と、
隣り合う前記電池セルの各々の前記電力断接手段を交互に断接させ、当該断接時の前記各々の電池セルの電圧に基づいて、前記検出線の断線を判定する断線判定手段と、を備え、
前記断線判定手段は、前記複数の電池セルのうちの第1電池セルの前記電圧が所定閾値未満であるか否か、且つ前記複数の電池セルのうちの前記第1電池セルに隣接する第2電池セルの前記電圧が前記所定閾値より高い所定範囲内であるか否かに基づき、前記検出線の断線を判定することを特徴とする組電池の異常検出装置。
A plurality of battery cells connected in series;
Voltage detection means connected in parallel to each positive electrode and negative electrode of each of the plurality of battery cells via a pair of detection lines to detect the voltage of each of the battery cells;
Power connecting / disconnecting means for connecting and disconnecting power connected in parallel to the positive and negative electrodes of each of the plurality of battery cells via the pair of detection lines;
Disconnection determination means for alternately disconnecting and connecting the power disconnection means of each of the adjacent battery cells and determining disconnection of the detection line based on the voltage of each of the battery cells at the time of the disconnection. Prepared,
The disconnection determination means determines whether or not the voltage of the first battery cell of the plurality of battery cells is less than a predetermined threshold, and is adjacent to the first battery cell of the plurality of battery cells. An assembled battery abnormality detection device, wherein the disconnection of the detection line is determined based on whether or not the voltage of the battery cell is within a predetermined range higher than the predetermined threshold.
前記断線判定手段は、前記複数の電池セルのうちの第1電池セルの前記電圧が所定閾値未満で、且つ前記複数の電池セルのうちの前記第1電池セルに隣接する第2電池セルの前記電圧が前記所定閾値より高い所定範囲内であると、前記第1電池セルにおける前記第2電池セル側とは反対側の検出線に断線有りと判定することを特徴とする請求項1に記載の組電池の異常検出装置。   The disconnection determining means is configured such that the voltage of the first battery cell of the plurality of battery cells is less than a predetermined threshold, and the second battery cell adjacent to the first battery cell of the plurality of battery cells is 2. The determination according to claim 1, wherein when the voltage is within a predetermined range higher than the predetermined threshold, it is determined that the detection line on the opposite side of the first battery cell from the second battery cell side is disconnected. A battery pack abnormality detection device. 前記断線判定手段は、前記複数の電池セルのうちの第1電池セルの前記電圧が所定閾値未満で、且つ前記複数の電池セルのうちの前記第1電池セルに隣接する第2電池セルの前記電圧が前記所定閾値より高い所定範囲外であると、前記第1電池セルにおける前記第2電池セル側の検出線に断線有りと判定することを特徴とする請求項1または2に記載の組電池の異常検出装置。   The disconnection determining means is configured such that the voltage of the first battery cell of the plurality of battery cells is less than a predetermined threshold, and the second battery cell adjacent to the first battery cell of the plurality of battery cells is 3. The assembled battery according to claim 1, wherein when the voltage is outside a predetermined range higher than the predetermined threshold, it is determined that the detection line on the second battery cell side in the first battery cell is disconnected. 4. Anomaly detection device. 前記第1電池セルは、前記複数の電池セルのうちの最も電位の高い側に位置する電池セル、或いは最も電位の低い側に位置する電池セルのいずれか一方であることを特徴とする、請求項2または3に記載の組電池の異常検出装置。   The first battery cell may be one of a battery cell located on the side having the highest potential among the plurality of battery cells, or a battery cell located on the side having the lowest potential. Item 4. The battery pack abnormality detection device according to Item 2 or 3.
JP2013216242A 2013-10-17 2013-10-17 Battery pack fault detection apparatus Pending JP2015078908A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2013216242A JP2015078908A (en) 2013-10-17 2013-10-17 Battery pack fault detection apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2013216242A JP2015078908A (en) 2013-10-17 2013-10-17 Battery pack fault detection apparatus

Publications (1)

Publication Number Publication Date
JP2015078908A true JP2015078908A (en) 2015-04-23

Family

ID=53010440

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2013216242A Pending JP2015078908A (en) 2013-10-17 2013-10-17 Battery pack fault detection apparatus

Country Status (1)

Country Link
JP (1) JP2015078908A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112098859A (en) * 2020-11-23 2020-12-18 广州汽车集团股份有限公司 Fuel cell fault diagnosis method and device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112098859A (en) * 2020-11-23 2020-12-18 广州汽车集团股份有限公司 Fuel cell fault diagnosis method and device
CN112098859B (en) * 2020-11-23 2021-02-02 广州汽车集团股份有限公司 Fuel cell fault diagnosis method and device

Similar Documents

Publication Publication Date Title
JP5443327B2 (en) Battery assembly
JP5076812B2 (en) Abnormality diagnosis device
US10707686B2 (en) Battery management
JP4260121B2 (en) Power supply
US9933489B2 (en) Battery monitoring apparatus
EP2418751B1 (en) Battery charger and battery charging method
JP5974849B2 (en) Battery monitoring device
JP2010091520A (en) Battery module abnormality detection circuit, and detection method therefor
EP3035067B1 (en) Method and apparatus for detecting faulty contacts in battery packs
US9494653B2 (en) Battery pack monitoring apparatus
WO2014115513A1 (en) System for estimating failure in cell module
JP6056581B2 (en) Abnormality detection device for battery pack
JP4693761B2 (en) Assembled battery system
JP7371203B2 (en) Rechargeable battery abnormality detection device and rechargeable battery abnormality detection method
JP5018615B2 (en) Abnormality detection device for battery pack
JP2015073340A (en) Power storage system
JP6402597B2 (en) Battery monitoring device, power storage device, and disconnection diagnosis method
JP6016754B2 (en) Battery voltage detector
JP2012208066A (en) Battery voltage detection device
JP6787705B2 (en) Anomaly detector and battery system
JP2015078908A (en) Battery pack fault detection apparatus
JP6018169B2 (en) Storage device failure determination method
CN103033756A (en) Battery-monitoring device
US20150061595A1 (en) Battery protection system and battery protection method using the same
JP6507989B2 (en) Battery monitoring device