JP6589669B2 - Temperature monitoring device - Google Patents

Temperature monitoring device Download PDF

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JP6589669B2
JP6589669B2 JP2016019683A JP2016019683A JP6589669B2 JP 6589669 B2 JP6589669 B2 JP 6589669B2 JP 2016019683 A JP2016019683 A JP 2016019683A JP 2016019683 A JP2016019683 A JP 2016019683A JP 6589669 B2 JP6589669 B2 JP 6589669B2
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temperature detection
temperature
detection unit
battery
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裕人 佐藤
裕人 佐藤
西垣　研治
研治 西垣
筒井　雄介
雄介 筒井
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Toyota Industries Corp
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    • 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
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Description

本発明は、温度監視装置に関する。   The present invention relates to a temperature monitoring device.

既存の温度監視装置として、温度検出部により検出される温度が閾値以上であると、その温度検出部の温度検出対象に高温異常が発生したと判断するものがある。
このように構成される温度監視装置を含む既存の電池パックとして、例えば、互いに並列接続される複数の電池モジュールのうちのある電池モジュールに有する電池に高温異常が発生したと温度監視装置により判断されると、その電池モジュールを他の電池モジュールから電気的に切り離したり、電池パックの動作を停止すものがある。 Some existing temperature monitoring devices determine that a high temperature abnormality has occurred in a temperature detection target of the temperature detection unit when the temperature detected by the temperature detection unit is equal to or higher than a threshold value.
As an existing battery pack including the temperature monitoring device configured as described above, for example, the temperature monitoring device determines that a high temperature abnormality has occurred in a battery included in a battery module among a plurality of battery modules connected in parallel to each other. Then, there are some that electrically disconnect the battery module from other battery modules or stop the operation of the battery pack.

また、上記温度監視装置を含む既存の電池パックとして、例えば、ある温度検出部が故障すると、その故障した温度検出部を有する電池モジュールを他の電池モジュールから切り離すものがある。関連する技術として、例えば、特許文献１〜３がある。   In addition, as an existing battery pack including the temperature monitoring device, for example, when a certain temperature detection unit fails, there is a battery pack having the failed temperature detection unit separated from other battery modules. As related technologies, for example, there are Patent Documents 1 to 3.

特開２０１０−０５７２９２号公報JP 2010-057292 A 特開平１１−１７８２３１号公報JP 11-178231 A 特開２００６−０７４８６９号公報JP 2006-074869 A

しかしながら、故障した温度検出部の温度検出対象である電池に高温異常が必ずしも発生するとは限らないため、温度検出部が故障しても、その故障した温度検出部の温度検出対象である電池の温度を検出することができれば、故障した温度検出部を有する電池モジュールを継続して使用したいという要望がある。   However, since a high temperature abnormality does not necessarily occur in the battery that is the temperature detection target of the failed temperature detection unit, even if the temperature detection unit fails, the temperature of the battery that is the temperature detection target of the failed temperature detection unit If the battery module can be detected, there is a desire to continue to use the battery module having the failed temperature detector.

そこで、本発明の一側面に係る目的は、ある温度検出部が故障しても、その故障した温度検出部を有する電池モジュールを継続して使用することが可能な温度監視装置を提供することを目的とする。   Therefore, an object according to one aspect of the present invention is to provide a temperature monitoring device that can continue to use a battery module having a failed temperature detection unit even if a certain temperature detection unit fails. Objective.

本発明に係る一つの形態である温度監視装置は、複数の温度検出部と、高温異常判断部と、閾値変更部とを備える。
高温異常判断部は、複数の温度検出部のうちの少なくとも１つの温度検出部により検出される温度が閾値以上になると、その温度検出部の温度検出範囲内の各温度検出対象のうちの少なくとも１つの温度検出対象に高温異常が発生したと判断する。 A temperature monitoring device according to one aspect of the present invention includes a plurality of temperature detection units, a high temperature abnormality determination unit, and a threshold change unit.
When the temperature detected by at least one temperature detection unit among the plurality of temperature detection units becomes equal to or higher than the threshold, the high temperature abnormality determination unit is at least one of the temperature detection targets in the temperature detection range of the temperature detection unit. It is determined that a high temperature abnormality has occurred in one temperature detection target.

閾値変更部は、複数の温度検出部のうちの少なくとも１つの温度検出部が故障すると、故障していない温度検出部の温度検出範囲が故障した温度検出部の温度検出範囲まで広がるように、上記閾値を下げる。   The threshold value changing unit is configured so that when at least one temperature detection unit of the plurality of temperature detection units fails, the temperature detection range of the non-failed temperature detection unit extends to the temperature detection range of the failed temperature detection unit. Lower the threshold.

本発明によれば、ある温度検出部が故障しても、その故障した温度検出部を備える電池モジュールを継続して使用することができる。   According to the present invention, even if a certain temperature detection unit fails, the battery module including the failed temperature detection unit can be continuously used.

実施形態の温度監視装置を含む電池パックの一例を示す図である。It is a figure which shows an example of the battery pack containing the temperature monitoring apparatus of embodiment. 制御部の動作例を示すフローチャートである。It is a flowchart which shows the operation example of a control part. 温度検出部の温度検出範囲の一例を示す図である。It is a figure which shows an example of the temperature detection range of a temperature detection part. 閾値の一例を示す図である。It is a figure which shows an example of a threshold value.

以下図面に基づいて実施形態について詳細を説明する。
図１は、実施形態の温度監視装置を含む電池パックの一例を示す図である。
図１に示す電池パック１は、互いに並列接続される複数の電池モジュール２と、制御部３とを備えている。なお、電池パック１は、例えば、電動フォークリフトやハイブリッドカーなどの車両に搭載され、走行モータを駆動するインバータなどの負荷や充電器との間で電力の授受を行う。 Hereinafter, embodiments will be described in detail with reference to the drawings.
FIG. 1 is a diagram illustrating an example of a battery pack including the temperature monitoring device according to the embodiment.
A battery pack 1 shown in FIG. 1 includes a plurality of battery modules 2 connected in parallel to each other and a control unit 3. The battery pack 1 is mounted on a vehicle such as an electric forklift or a hybrid car, for example, and exchanges electric power with a load such as an inverter that drives a traveling motor or a charger.

各電池モジュール２は、直列接続される複数の電池Ｂと、スイッチＳＷと、３つの温度検出部２１（温度検出部２１−１〜２１−３）と、監視部２２とを備えている。
各電池Ｂは、例えば、リチウムイオン電池、ニッケル水素電池、または電気二重層コンデンサにより構成されている。負荷または充電器から各電池Ｂへ電力が供給されているときや各電池Ｂから負荷へ電力が供給されているとき、各電池Ｂの温度が上昇する。 Each battery module 2 includes a plurality of batteries B connected in series, a switch SW, three temperature detection units 21 (temperature detection units 21-1 to 21-3), and a monitoring unit 22.
Each battery B is composed of, for example, a lithium ion battery, a nickel metal hydride battery, or an electric double layer capacitor. When electric power is supplied from the load or the charger to each battery B or when electric power is supplied from each battery B to the load, the temperature of each battery B rises.

スイッチＳＷは、例えば、ＭＯＳＦＥＴ（Metal Oxide Semiconductor Field Effect Transistor）などの半導体リレーや電磁式リレーにより構成され、一方の端に位置する電池Ｂのマイナス端子に接続されている。スイッチＳＷがオンすると、そのスイッチＳＷを有する電池モジュール２は、スイッチＳＷがオンしている他の電池モジュール２や負荷または充電器と電気的に接続され、そのオンされたスイッチＳＷを有する電池モジュール２の使用が継続される。また、スイッチＳＷがオフすると、そのスイッチＳＷを有する電池モジュール２はスイッチＳＷがオンしている他の電池モジュール２や負荷または充電器から電気的に切り離され、そのオフされたスイッチＳＷを有する電池モジュール２の使用が禁止される。なお、図１に示す例では、スイッチＳＷが、一方の端に位置する電池Ｂのマイナス端子に接続されているが、他方の端に位置する電池Ｂのプラス端子に接続されていてもよい。   The switch SW is constituted by, for example, a semiconductor relay such as a MOSFET (Metal Oxide Semiconductor Field Effect Transistor) or an electromagnetic relay, and is connected to the negative terminal of the battery B located at one end. When the switch SW is turned on, the battery module 2 having the switch SW is electrically connected to another battery module 2 or a load or a charger in which the switch SW is turned on, and the battery module having the turned switch SW. The use of 2 continues. Further, when the switch SW is turned off, the battery module 2 having the switch SW is electrically disconnected from the other battery module 2 and the load or the charger in which the switch SW is turned on, and the battery having the turned off switch SW. Use of module 2 is prohibited. In the example shown in FIG. 1, the switch SW is connected to the minus terminal of the battery B located at one end, but may be connected to the plus terminal of the battery B located at the other end.

温度検出部２１−１〜２１−３は、例えば、サーミスタにより構成され、同一直線上に並ぶ複数の電池Ｂに所定数の電池Ｂ間隔で設置されている。温度検出部２１−１は、温度検出範囲Ｒ１内の各電池Ｂの温度を検出し、温度検出部２１−２は、温度検出範囲Ｒ２内の各電池Ｂの温度を検出し、温度検出部２１−３は、温度検出範囲Ｒ３内の各電池Ｂの温度を検出する。なお、各電池モジュール２に備えられる温度検出部２１の数は３つに限定されない。   The temperature detectors 21-1 to 21-3 are configured by, for example, a thermistor, and are installed in a plurality of batteries B arranged on the same straight line with a predetermined number of battery B intervals. The temperature detection unit 21-1 detects the temperature of each battery B in the temperature detection range R1, the temperature detection unit 21-2 detects the temperature of each battery B in the temperature detection range R2, and the temperature detection unit 21 -3 detects the temperature of each battery B within the temperature detection range R3. In addition, the number of the temperature detection parts 21 with which each battery module 2 is provided is not limited to three.

監視部２２は、例えば、ＣＰＵ（Central Processing Unit）やプログラマブルディバイスにより構成され、制御部３から送られてくる指示により、スイッチＳＷのオン、オフを制御する。また、監視部２２は、温度検出部２１−１〜２１−３により検出される各温度を示す温度情報を制御部３に送る。   The monitoring unit 22 is configured by, for example, a CPU (Central Processing Unit) or a programmable device, and controls the on / off of the switch SW according to an instruction sent from the control unit 3. In addition, the monitoring unit 22 sends temperature information indicating each temperature detected by the temperature detection units 21-1 to 21-3 to the control unit 3.

制御部３は、高温異常判断部３１と、故障判断部３２と、遮断制御部３３と、閾値変更部３４とを備える。なお、制御部３は、例えば、ＣＰＵやプログラマブルディバイスにより構成され、ＣＰＵやプログラマブルディバイスが不図示の記憶部に記憶されているプログラムを読み出し実行することによって高温異常判断部３１、故障判断部３２、遮断制御部３３、閾値変更部３４などが実現される。また、実施形態の温度監視装置は、例えば、温度検出部２１−１〜２１−３と、高温異常判断部３１と、閾値変更部３４とを備えて構成されるものとする。   The control unit 3 includes a high temperature abnormality determination unit 31, a failure determination unit 32, a cutoff control unit 33, and a threshold change unit 34. The control unit 3 is constituted by, for example, a CPU or a programmable device, and the CPU or the programmable device reads and executes a program stored in a storage unit (not shown), thereby executing a high temperature abnormality determination unit 31, a failure determination unit 32, A blocking control unit 33, a threshold value changing unit 34, and the like are realized. Moreover, the temperature monitoring apparatus of embodiment shall be comprised including the temperature detection parts 21-1 to 21-3, the high temperature abnormality determination part 31, and the threshold value change part 34, for example.

高温異常判断部３１は、温度情報に示される各温度のうちの少なくとも１つの温度が閾値以上になると、その温度を検出した温度検出部２１の温度検出範囲内の各電池Ｂのうちの少なくとも１つの電池Ｂに高温異常が発生したと判断する。すなわち、高温異常判断部３１は、複数の温度検出部２１のうちの少なくとも１つの温度検出部２１により検出される温度が閾値以上になると、その温度を検出した温度検出部２１の温度検出範囲内の各温度検出対象のうちの少なくとも１つの温度検出対象に高温異常が発生したと判断する。また、高温異常判断部３１は、温度情報に示される各温度がすべて閾値よりも小さいと、その温度情報の送り元の電池モジュール２に有するすべての電池Ｂに高温異常が発生していないと判断する。   When at least one of the temperatures indicated in the temperature information is equal to or higher than the threshold, the high temperature abnormality determination unit 31 detects at least one of the batteries B within the temperature detection range of the temperature detection unit 21 that detects the temperature. It is determined that a high temperature abnormality has occurred in one battery B. That is, when the temperature detected by at least one temperature detection unit 21 among the plurality of temperature detection units 21 exceeds a threshold value, the high temperature abnormality determination unit 31 is within the temperature detection range of the temperature detection unit 21 that detects the temperature. It is determined that a high temperature abnormality has occurred in at least one of the temperature detection targets. Further, when the temperatures indicated in the temperature information are all lower than the threshold value, the high temperature abnormality determination unit 31 determines that no high temperature abnormality has occurred in all the batteries B included in the battery module 2 that is the source of the temperature information. To do.

故障判断部３２は、例えば、温度情報に示される各温度のうちの少なくとも１つの温度が、温度検出部２１が故障していることを示す値になると、その温度を検出した温度検出部２１が故障したと判断する。また、故障判断部３２は、例えば、温度情報に示される各温度が、温度検出部２１が故障していることを示す値になっていないと、温度情報の送り元の電池モジュール２に有するすべての温度検出部２１−１〜２１−３が故障していないと判断する。   For example, when at least one of the temperatures indicated in the temperature information has a value indicating that the temperature detection unit 21 has failed, the failure determination unit 32 detects that the temperature detection unit 21 detects the temperature. Judge that it has failed. Further, for example, if the temperature indicated in the temperature information is not a value indicating that the temperature detection unit 21 is out of order, the failure determination unit 32 has all of the battery modules 2 that are the sources of the temperature information. It is determined that the temperature detection units 21-1 to 21-3 have not failed.

遮断制御部３３は、高温異常が発生した電池Ｂを有する電池モジュール２のスイッチＳＷをオフさせる。
閾値変更部３４は、温度検出部２１−１〜２１−３のうちの少なくとも１つの温度検出部２１が故障すると、故障していない温度検出部２１の温度検出範囲が故障した温度検出部２１の温度検出範囲まで広がるように、高温異常判断部３１で使用される閾値を下げる。 The shutoff control unit 33 turns off the switch SW of the battery module 2 having the battery B in which the high temperature abnormality has occurred.
When at least one temperature detection unit 21 of the temperature detection units 21-1 to 21-3 fails, the threshold value changing unit 34 has a temperature detection range of the temperature detection unit 21 that has not failed. The threshold used by the high temperature abnormality determination unit 31 is lowered so as to extend to the temperature detection range.

このように、実施形態の温度監視装置では、温度検出部２１−１〜２１−３のうちの少なくとも１つの温度検出部２１が故障すると、故障していない温度検出部２１の温度検出範囲が故障した温度検出部２１の温度検出範囲まで広がるように、高温異常判断部３１で使用される閾値を下げる。これにより、故障していない温度検出部２１の温度検出範囲内の各電池Ｂだけでなく、故障した温度検出部２１の温度検出範囲内の各電池Ｂに対しても高温異常が発生したか否かを判断することができるようになるため、ある温度検出部２１が故障しても、その故障した温度検出部２１を備える電池モジュール２を継続して使用することができる。   Thus, in the temperature monitoring device of the embodiment, when at least one temperature detection unit 21 among the temperature detection units 21-1 to 21-3 fails, the temperature detection range of the temperature detection unit 21 that has not failed fails. The threshold used by the high temperature abnormality determination unit 31 is lowered so as to extend to the temperature detection range of the temperature detection unit 21. Thus, whether or not a high temperature abnormality has occurred not only in each battery B within the temperature detection range of the temperature detection unit 21 that has not failed, but also in each battery B within the temperature detection range of the temperature detection unit 21 that has failed. Therefore, even if a certain temperature detection unit 21 fails, the battery module 2 including the failed temperature detection unit 21 can be continuously used.

図２は、制御部３の動作例を示すフローチャートである。
まず、制御部３の故障判断部３２は、温度検出部２１が故障していないと判断しているとき（Ｓ２１：Ｎｏ）、現在の状態を維持し、少なくとも１つの温度検出部２１が故障したと判断すると（Ｓ２１：Ｙｅｓ）、現在故障している温度検出部２１が１つのみであるか否かを判断する（Ｓ２２）。 FIG. 2 is a flowchart illustrating an operation example of the control unit 3.
First, when the failure determination unit 32 of the control unit 3 determines that the temperature detection unit 21 has not failed (S21: No), the current state is maintained and at least one temperature detection unit 21 has failed. If it is determined (S21: Yes), it is determined whether or not there is only one temperature detection unit 21 that is currently malfunctioning (S22).

次に、制御部３の閾値変更部３４は、１つの温度検出部２１のみが故障していると判断されると（Ｓ２２：Ｙｅｓ）、故障していない温度検出部２１の温度検出範囲が故障した温度検出部２１の温度検出範囲まで広がるように、高温異常判断部３１で使用される閾値を下げる（Ｓ２３）。   Next, when it is determined that only one temperature detection unit 21 has failed (S22: Yes), the threshold detection unit 34 of the control unit 3 has a failure in the temperature detection range of the temperature detection unit 21 that has not failed. The threshold used by the high temperature abnormality determination unit 31 is lowered so as to extend to the temperature detection range of the temperature detection unit 21 (S23).

また、制御部３の故障判断部３２は、現在故障している温度検出部２１が１つのみでないと判断すると（Ｓ２２：Ｎｏ）、真ん中に位置する温度検出部２１−２を除く２つの温度検出部２１−１、２１−３が故障しているか否かを判断する（Ｓ２４）。   When the failure determination unit 32 of the control unit 3 determines that there is not only one temperature detection unit 21 that is currently in failure (S22: No), the two temperatures except for the temperature detection unit 21-2 located in the middle are determined. It is determined whether the detectors 21-1 and 21-3 are out of order (S24).

次に、制御部３の閾値変更部３４は、真ん中に位置する温度検出部２１−２を除く２つの温度検出部２１−１、２１−３が故障していると判断されると（Ｓ２４：Ｙｅｓ）、故障していない温度検出部２１の温度検出範囲が故障した温度検出部２１の温度検出範囲まで広がるように、高温異常判断部３１で使用される閾値を下げる（Ｓ２３）。   Next, the threshold value changing unit 34 of the control unit 3 determines that the two temperature detection units 21-1 and 21-3 except the temperature detection unit 21-2 located in the middle are out of order (S24: Yes), the threshold used by the high temperature abnormality determination unit 31 is lowered so that the temperature detection range of the temperature detection unit 21 that has not failed extends to the temperature detection range of the temperature detection unit 21 that has failed (S23).

また、制御部３の遮断制御部３３は、真ん中に位置する温度検出部２１−２を除く２つの温度検出部２１−１、２１−３が故障していないと判断されると、すなわち、隣り合う２つの温度検出部２１が故障していると判断されると（Ｓ２４：Ｎｏ）、その２つの温度検出部２１を有する電池モジュール２のスイッチＳＷをオフさせる（Ｓ２５）。   Further, the shutoff control unit 33 of the control unit 3 determines that the two temperature detection units 21-1 and 21-3 except the temperature detection unit 21-2 located in the middle have not failed, that is, If it is determined that the two matching temperature detectors 21 are out of order (S24: No), the switch SW of the battery module 2 having the two temperature detectors 21 is turned off (S25).

すなわち、電池モジュール２に有する各電池Ｂは、その電池モジュール２に有する温度検出部２１−１〜２１−３のうち、隣り合う２つの温度検出部２１が故障すると、使用が禁止され、その電池モジュール２に有する温度検出部２１−１〜２１−３のうち、真ん中に位置する温度検出部２１−２を除く２つの温度検出部２１−１、２１−３が故障すると、使用が継続される。   That is, each battery B included in the battery module 2 is prohibited from being used when two adjacent temperature detection units 21 out of the temperature detection units 21-1 to 21-3 included in the battery module 2 fail. When two temperature detection units 21-1 and 21-3 except for the temperature detection unit 21-2 located in the middle of the temperature detection units 21-1 to 21-3 included in the module 2 fail, the use is continued. .

ここで、図３に示すように、電池モジュール２に有する１５個の電池Ｂ１〜Ｂ１５のうちの電池Ｂ３に温度検出部２１−１が設置され、電池Ｂ８に温度検出部２１−２が設置され、電池Ｂ１３に温度検出部２１−３が設置されている場合を想定する。   Here, as shown in FIG. 3, the temperature detection unit 21-1 is installed in the battery B3 among the 15 batteries B1 to B15 included in the battery module 2, and the temperature detection unit 21-2 is installed in the battery B8. Suppose that the temperature detector 21-3 is installed in the battery B13.

なお、図３（ａ）には、温度検出部２１−１〜２１−３が故障していない場合の温度検出部２１−１の温度検出範囲Ｒ１、温度検出部２１−２の温度検出範囲Ｒ２、及び温度検出部２１−３の温度検出範囲Ｒ３を示している。また、図３（ｂ）には、１つの温度検出部２１−２のみが故障した場合の温度検出部２１−１の温度検出範囲Ｒ１及び温度検出部２１−３の温度検出範囲Ｒ３を示している。また、図３（ｃ）には、真ん中に位置する温度検出部２１−２を除く２つの温度検出部２１−１、２１−３が故障した場合の温度検出部２１−２の温度検出範囲Ｒ２を示している。   FIG. 3A shows the temperature detection range R1 of the temperature detection unit 21-1 and the temperature detection range R2 of the temperature detection unit 21-2 when the temperature detection units 21-1 to 21-3 are not out of order. And a temperature detection range R3 of the temperature detector 21-3. FIG. 3B shows a temperature detection range R1 of the temperature detection unit 21-1 and a temperature detection range R3 of the temperature detection unit 21-3 when only one temperature detection unit 21-2 fails. Yes. Further, FIG. 3C shows the temperature detection range R2 of the temperature detection unit 21-2 when the two temperature detection units 21-1 and 21-3 except for the temperature detection unit 21-2 located in the middle fail. Is shown.

まず、温度検出部２１−１〜２１−３が故障していない場合の閾値について説明する。
図４（ａ）は、温度検出部２１−１〜２１−３が故障していない場合の閾値の一例を示す図である。 First, the threshold when the temperature detection units 21-1 to 21-3 are not out of order will be described.
Fig.4 (a) is a figure which shows an example of the threshold value when the temperature detection parts 21-1 to 21-3 are not out of order.

図４（ａ）では、電池Ｂが劣化するときの電池Ｂの温度である劣化温度（８０℃）から所定の誤差（２０℃）を引いた値を閾値（６０℃）としている。
なお、所定の誤差には、電池内外温度差（例えば、電池Ｂ内部の発熱源の温度とその電池Ｂの外部表面の温度との差）、電池間温度差（例えば、故障していない温度検出部２１の温度検出範囲内の各電池Ｂの数で決まる値）、検出誤差（例えば、電池Ｂと温度検出部２１との密着度による温度検出部２１の検出値の誤差）、及び温度検出部公差（例えば、製造バラツキによる温度検出部２１の検出値の誤差）が含まれているものとする。このように電池間温度差が考慮されて閾値が設定されるため、温度検出部２１から離れている電池Ｂに高温異常が発生しているか否かを判断することができる。これにより、各電池Ｂにそれぞれ温度検出部２１を設置する場合に比べて、温度検出部２１の数を低減するこができ、その分製造コストを下げることができる。 In FIG. 4A, the threshold (60 ° C.) is a value obtained by subtracting a predetermined error (20 ° C.) from the deterioration temperature (80 ° C.) that is the temperature of the battery B when the battery B deteriorates.
The predetermined error includes a battery internal / external temperature difference (for example, a difference between the temperature of the heat generation source inside the battery B and the temperature of the external surface of the battery B), and an inter-battery temperature difference (for example, temperature detection without malfunction). A value determined by the number of each battery B within the temperature detection range of the unit 21), a detection error (for example, an error in the detection value of the temperature detection unit 21 due to the degree of adhesion between the battery B and the temperature detection unit 21), and a temperature detection unit It is assumed that a tolerance (for example, an error in the detection value of the temperature detection unit 21 due to manufacturing variation) is included. Thus, since the threshold value is set in consideration of the inter-battery temperature difference, it is possible to determine whether or not a high temperature abnormality has occurred in the battery B that is distant from the temperature detection unit 21. Thereby, compared with the case where the temperature detection part 21 is each installed in each battery B, the number of the temperature detection parts 21 can be reduced, and manufacturing cost can be reduced by that much.

図４（ａ）に示す電池間温度差は、故障していない温度検出部２１−１〜２１−３のそれぞれの温度検出範囲内の各電池Ｂの数で決まる値であり、それら電池Ｂの数を３つとしている。   The inter-battery temperature difference shown in FIG. 4A is a value determined by the number of each battery B within the temperature detection range of each of the temperature detection units 21-1 to 21-3 that has not failed. The number is three.

この電池間温度差が含まれるように閾値が設定されると、図３（ａ）に示すように、温度検出部２１−１によって温度検出範囲Ｒ１内の３つの電池Ｂ１〜Ｂ３の温度や温度検出範囲Ｒ１内の３つの電池Ｂ３〜Ｂ５の温度を検出することが可能になり、温度検出部２１−２によって温度検出範囲Ｒ２内の３つの電池Ｂ６〜Ｂ８の温度や温度検出範囲Ｒ２内の３つの電池Ｂ８〜Ｂ１０の温度を検出することが可能になり、温度検出部２１−３によって温度検出範囲Ｒ３内の３つの電池Ｂ１１〜Ｂ１３の温度や温度検出範囲Ｒ３内の３つの電池Ｂ１３〜Ｂ１５の温度を検出することが可能になる。   When the threshold is set so as to include this inter-battery temperature difference, as shown in FIG. 3A, the temperature and temperature of the three batteries B1 to B3 in the temperature detection range R1 are detected by the temperature detector 21-1. The temperature of the three batteries B3 to B5 in the detection range R1 can be detected, and the temperature of the three batteries B6 to B8 in the temperature detection range R2 and the temperature detection range R2 can be detected by the temperature detection unit 21-2. The temperature of the three batteries B8 to B10 can be detected, and the temperature of the three batteries B11 to B13 in the temperature detection range R3 and the three batteries B13 to B in the temperature detection range R3 are detected by the temperature detection unit 21-3. It becomes possible to detect the temperature of B15.

次に、１つの温度検出部２１−２のみが故障した場合の閾値について説明する。
図４（ｂ）は、１つの温度検出部２１−２のみが故障した場合の閾値の一例を示すである。 Next, the threshold value when only one temperature detection unit 21-2 fails will be described.
FIG. 4B shows an example of the threshold when only one temperature detection unit 21-2 fails.

図４（ｂ）に示す電池間温度差は、故障していない温度検出部２１−１、２１−３のそれぞれの温度検出範囲内の各電池Ｂの数で決まる値であり、それら電池Ｂの数を６つとしている。   The inter-battery temperature difference shown in FIG. 4B is a value determined by the number of each battery B within the temperature detection range of each of the temperature detectors 21-1 and 21-3 that are not in failure. The number is six.

すなわち、閾値変更部３４は、１つの温度検出部２１−２のみが故障すると、故障していない温度検出部２１−１、２１−３のそれぞれの温度検出範囲内の各電池Ｂの数が３つから６つに多くなることに応じて、図４（ａ）に示す３つの電池Ｂで決まる電池間温度差を、図４（ｂ）に示す６つの電池Ｂで決まる電池間温度差まで大きくすることにより、図４（ａ）に示す６０℃の閾値を、図４（ｂ）に示す５０℃の閾値に下げる。なお、図４（ｂ）に示す電池内外温度差、検出誤差、及び温度検出部公差は、図４（ａ）に示す電池内外温度差、検出誤差、及び温度検出部公差と比べて変化しないものとする。   That is, when only one temperature detection unit 21-2 fails, the threshold value changing unit 34 has three battery B within the temperature detection range of each of the temperature detection units 21-1 and 21-3 that have not failed. As the number increases from one to six, the inter-battery temperature difference determined by the three batteries B shown in FIG. 4A is increased to the inter-battery temperature difference determined by the six batteries B shown in FIG. 4B. As a result, the 60 ° C. threshold shown in FIG. 4A is lowered to the 50 ° C. threshold shown in FIG. 4B. Note that the battery internal / external temperature difference, detection error, and temperature detection unit tolerance shown in FIG. 4B do not change compared to the battery internal / external temperature difference, detection error, and temperature detection unit tolerance shown in FIG. 4A. And

また、１つの温度検出部２１−２のみが故障しているとき、３つの電池Ｂで決まる電池間温度差を、６つの電池Ｂで決まる電池間温度差まで大きくすることにより、閾値を下げることは、故障していない温度検出部２１−１、２１−３の温度検出範囲Ｒ１、Ｒ３が故障した温度検出部２１−２の温度検出範囲Ｒ２まで広がるように、閾値を下げることに相当する。   Further, when only one temperature detection unit 21-2 is out of order, the threshold value is lowered by increasing the inter-battery temperature difference determined by the three batteries B to the inter-battery temperature difference determined by the six batteries B. Corresponds to lowering the threshold value so that the temperature detection ranges R1 and R3 of the temperature detection units 21-1 and 21-3 that have not failed expand to the temperature detection range R2 of the temperature detection unit 21-2 that has failed.

これにより、１つの温度検出部２１−２のみが故障しても、故障していない温度検出部２１−１、２１−３の温度検出範囲Ｒ１、Ｒ３を、故障した温度検出部２１−２の温度検出範囲Ｒ２まで広げることができるため、図３（ｂ）に示すように、温度検出部２１−１によって温度検出範囲Ｒ１内の３つの電池Ｂ１〜Ｂ３の温度や温度検出範囲Ｒ１内の６つの電池Ｂ３〜Ｂ８の温度を検出することが可能になり、温度検出部２１−３によって温度検出範囲Ｒ３内の６つの電池Ｂ８〜Ｂ１３の温度や温度検出範囲Ｒ３内の３つの電池Ｂ１３〜Ｂ１５の温度を検出することが可能になる。   As a result, even if only one temperature detection unit 21-2 fails, the temperature detection ranges R1 and R3 of the temperature detection units 21-1 and 21-3 that have not failed are changed to those of the failed temperature detection unit 21-2. Since the temperature can be extended to the temperature detection range R2, as shown in FIG. 3B, the temperature of the three batteries B1 to B3 in the temperature detection range R1 and 6 in the temperature detection range R1 are detected by the temperature detection unit 21-1. The temperature of the two batteries B3 to B8 can be detected, and the temperature of the six batteries B8 to B13 in the temperature detection range R3 and the three batteries B13 to B15 in the temperature detection range R3 are detected by the temperature detection unit 21-3. Temperature can be detected.

次に、真ん中に位置する温度検出部２１−２を除く２つの温度検出部２１−１、２１−３が故障した場合の閾値について説明する。
図４（ｃ）は、真ん中に位置する温度検出部２１−２を除く２つの温度検出部２１−１、２１−３が故障した場合の閾値の一例を示すである。 Next, the threshold when the two temperature detection units 21-1 and 21-3 except for the temperature detection unit 21-2 located in the middle fail will be described.
FIG. 4C shows an example of a threshold when the two temperature detection units 21-1 and 21-3 except the temperature detection unit 21-2 located in the middle fail.

図４（ｃ）に示す電池間温度差は、故障していない温度検出部２１−２の温度検出範囲内の各電池Ｂの数で決まる値であり、それら電池Ｂの数を８つとしている。
すなわち、閾値変更部３４は、真ん中に位置する温度検出部２１−２を除く２つの温度検出部２１−１、２１−３が故障すると、故障していない温度検出部２１−２の温度検出範囲内の各電池Ｂの数が３つから８つに多くなることに応じて、図４（ａ）に示す３つの電池Ｂで決まる電池間温度差を、図４（ｃ）に示す８つの電池Ｂで決まる電池間温度差まで大きくすることにより、図４（ａ）に示す６０℃の閾値を、図４（ｃ）に示す４０℃の閾値に下げる。なお、図４（ｃ）に示す電池内外温度差、検出誤差、及び温度検出部公差は、図４（ａ）に示す電池内外温度差、検出誤差、及び温度検出部公差と比べて変化しないものとする。 The inter-battery temperature difference shown in FIG. 4C is a value determined by the number of each battery B within the temperature detection range of the temperature detection unit 21-2 that has not failed, and the number of the batteries B is eight. .
That is, when the two temperature detection units 21-1 and 21-3 except for the temperature detection unit 21-2 located in the middle fail, the threshold change unit 34 detects the temperature detection range of the temperature detection unit 21-2 that has not failed. As the number of each battery B increases from three to eight, the temperature difference between the batteries determined by the three batteries B shown in FIG. 4A is changed to eight batteries shown in FIG. 4C. By increasing the temperature difference between batteries determined by B, the 60 ° C. threshold shown in FIG. 4A is lowered to the 40 ° C. threshold shown in FIG. 4C. Note that the battery internal / external temperature difference, detection error, and temperature detection unit tolerance shown in FIG. 4 (c) do not change compared to the battery internal / external temperature difference, detection error, and temperature detection unit tolerance shown in FIG. 4 (a). And

また、真ん中に位置する温度検出部２１−２を除く２つの温度検出部２１−１、２１−３が故障しているとき、３つの電池Ｂで決まる電池間温度差を、８つの電池Ｂで決まる電池間温度差まで大きくすることにより、閾値を下げることは、故障していない温度検出部２１−２の温度検出範囲Ｒ２が故障した温度検出部２１−１、２１−３の温度検出範囲Ｒ１、Ｒ３まで広がるように、閾値を下げることに相当する。   Further, when the two temperature detection units 21-1 and 21-3 except the temperature detection unit 21-2 located in the middle are out of order, the inter-battery temperature difference determined by the three batteries B is Decreasing the threshold value by increasing the determined inter-battery temperature difference means that the temperature detection range R1 of the temperature detection unit 21-1 and 21-3 in which the temperature detection range R2 of the temperature detection unit 21-2 that has not failed has failed. , Corresponding to lowering the threshold value so as to spread to R3.

これにより、真ん中に位置する温度検出部２１−２を除く２つの温度検出部２１−１、２１−３が故障しても、故障していない温度検出部２１−２の温度検出範囲Ｒ２を、故障した温度検出部２１−１、２１−３の温度検出範囲Ｒ１、Ｒ３まで広げることができるため、図３（ｃ）に示すように、温度検出部２１−２によって温度検出範囲Ｒ２内の８つの電池Ｂ１〜Ｂ８の温度や温度検出範囲Ｒ２内の８つの電池Ｂ８〜Ｂ１５の温度を検出することが可能になる。   Thereby, even if the two temperature detection units 21-1 and 21-3 except the temperature detection unit 21-2 located in the middle fail, the temperature detection range R <b> 2 of the temperature detection unit 21-2 that has not failed is Since the temperature can be expanded to the temperature detection ranges R1 and R3 of the failed temperature detection units 21-1 and 21-3, as shown in FIG. 3C, the temperature detection unit 21-2 uses 8 in the temperature detection range R2. It becomes possible to detect the temperature of the two batteries B1 to B8 and the temperature of the eight batteries B8 to B15 within the temperature detection range R2.

なお、閾値変更部３４は、１つの温度検出部２１のみが故障すると、または、真ん中に位置する温度検出部２１−２を除く２つの温度検出部２１−１、２１−３が故障すると、故障していない温度検出部２１とその温度検出部２１の温度検出範囲内の各電池Ｂとの距離が長くなるに応じて、電池間温度差を大きくすることにより、閾値を下げるように構成してもよい。このように構成する場合、電池間温度差は、例えば、故障していない温度検出部２１とその温度検出部２１の温度検出範囲内の各電池Ｂとの距離で決まる値とする。   In addition, the threshold value changing unit 34 fails when only one temperature detecting unit 21 fails or when two temperature detecting units 21-1 and 21-3 except for the temperature detecting unit 21-2 located in the middle fail. The threshold value is lowered by increasing the inter-battery temperature difference as the distance between the temperature detection unit 21 that is not connected and each battery B within the temperature detection range of the temperature detection unit 21 increases. Also good. In the case of such a configuration, the inter-battery temperature difference is, for example, a value determined by the distance between the temperature detection unit 21 that is not in failure and each battery B within the temperature detection range of the temperature detection unit 21.

次に、隣り合う２つの温度検出部２１−１、２１−２が故障した場合について説明する。
この場合において、故障していない温度検出部２１−３の温度検出範囲Ｒ３が、故障した温度検出部２１−１、２１−２の温度検出範囲Ｒ１、Ｒ２まで広がるように、閾値を下げても、故障していない温度検出部２１−３が電池Ｂ６〜Ｂ１３の温度までしか正確に検出することができないと、電池Ｂ１〜Ｂ５の温度を正確に検出することができない。 Next, a case where two adjacent temperature detection units 21-1 and 21-2 fail will be described.
In this case, even if the threshold value is lowered so that the temperature detection range R3 of the non-failed temperature detection unit 21-3 extends to the temperature detection ranges R1 and R2 of the failed temperature detection units 21-1 and 21-2. If the temperature detection unit 21-3 that has not failed can only accurately detect the temperature of the batteries B6 to B13, the temperature of the batteries B1 to B5 cannot be detected accurately.

そこで、遮断制御部３３は、隣り合う２つの温度検出部２１−１、２１−２が故障すると、それら温度検出部２１−１、２１−２を有する電池モジュール２のスイッチＳＷをオフさせることにより、その電池モジュール２を他の電池モジュール２から電気的に切り離している。これにより、電池Ｂ１〜Ｂ５に高温異常が発生している状態が続いて、電池Ｂ１〜Ｂ５が劣化してしまうことを防止することができる。   Therefore, when the two adjacent temperature detection units 21-1 and 21-2 fail, the cutoff control unit 33 turns off the switch SW of the battery module 2 having the temperature detection units 21-1 and 21-2. The battery module 2 is electrically disconnected from the other battery modules 2. Thereby, it is possible to prevent the batteries B1 to B5 from deteriorating due to the state in which the high temperature abnormality has occurred in the batteries B1 to B5.

このように、図２に示す動作例では、１つの温度検出部２１のみが故障すると、または、真ん中に位置する温度検出部２１−２を除く２つの温度検出部２１−１、２１−３が故障すると、故障していない温度検出部２１の温度検出範囲が故障した温度検出部２１の温度検出範囲まで広がるように、閾値を下げる。これにより、温度検出部２１−１〜２１−３のうち、１つの温度検出部２１のみが故障した場合、または、真ん中に位置する温度検出部２１−２を除く２つの温度検出部２１−１、２１−３が故障した場合、その故障した温度検出部２１を備える電池モジュール２を他の電池モジュール２から切り離さないようにすることができる。すなわち、電池パック１において、ある温度検出部２１が故障しても、その故障した温度検出部２１を備える電池モジュール２を他の電池モジュール２からできるだけ切り離さないようにすることができる。なお、電池モジュール２を電気的に切り離すかわりに、全ての電池モジュール２から出力される電力を制限または停止してもよい。また、本発明は、上記実施形態に限定されるものでなく、本発明の要旨を逸脱しない範囲内で種々の改良、変更が可能である。   As described above, in the operation example shown in FIG. 2, when only one temperature detection unit 21 fails or two temperature detection units 21-1 and 21-3 except for the temperature detection unit 21-2 located in the middle are When a failure occurs, the threshold value is lowered so that the temperature detection range of the temperature detection unit 21 that has not failed extends to the temperature detection range of the failed temperature detection unit 21. Thereby, when only one temperature detection part 21 fails among temperature detection parts 21-1 to 21-3, or two temperature detection parts 21-1 except temperature detection part 21-2 located in the middle , 21-3 can be prevented from being disconnected from the other battery modules 2 with the failed temperature detector 21. That is, in the battery pack 1, even if a certain temperature detection unit 21 fails, the battery module 2 including the failed temperature detection unit 21 can be prevented from being separated from other battery modules 2 as much as possible. Note that, instead of electrically disconnecting the battery modules 2, the power output from all the battery modules 2 may be limited or stopped. Further, the present invention is not limited to the above-described embodiment, and various improvements and changes can be made without departing from the gist of the present invention.

１ 電池パック
２ 電池モジュール
３ 制御部
２１ 温度検出部
２２ 監視部
３１ 高温異常判断部
３２ 故障判断部
３３ 遮断制御部
３４ 閾値変更部
DESCRIPTION OF SYMBOLS 1 Battery pack 2 Battery module 3 Control part 21 Temperature detection part 22 Monitoring part 31 High temperature abnormality judgment part 32 Failure judgment part 33 Blocking control part 34 Threshold change part

Claims (3)

複数の温度検出部と、
前記複数の温度検出部のうちの少なくとも１つの温度検出部により検出される温度が閾値以上になると、その温度検出部の温度検出範囲内の各温度検出対象のうちの少なくとも１つの温度検出対象に高温異常が発生したと判断する高温異常判断部と、
前記複数の温度検出部のうちの少なくとも１つの温度検出部が故障すると、故障していない温度検出部の温度検出範囲が故障した温度検出部の温度検出範囲まで広がるように、前記閾値を下げる閾値変更部と、
を備えることを特徴とする温度監視装置。 A plurality of temperature detectors;
When the temperature detected by at least one temperature detection unit among the plurality of temperature detection units is equal to or higher than a threshold value, at least one temperature detection target among the temperature detection targets in the temperature detection range of the temperature detection unit is set. A high temperature abnormality determination unit that determines that a high temperature abnormality has occurred;
When at least one temperature detection unit of the plurality of temperature detection units fails, a threshold value that lowers the threshold value so that the temperature detection range of the non-failed temperature detection unit extends to the temperature detection range of the failed temperature detection unit Change part,
A temperature monitoring device comprising: 請求項１に記載の温度監視装置であって、
前記閾値変更部は、前記複数の温度検出部のうちの少なくとも１つの温度検出部が故障すると、故障していない温度検出部の温度検出範囲内の各電池の数が多くなることに応じて、または、前記故障していない温度検出部とその温度検出部の温度検出範囲内の各電池との距離が長くなることに応じて、前記故障していない温度検出部の温度検出範囲内の各電池の数または前記故障していない温度検出部とその温度検出部の温度検出範囲内の各電池との距離で決まる電池間温度差を大きくすることにより、前記閾値を下げる
ことを特徴とする温度監視装置。 The temperature monitoring device according to claim 1,
When at least one temperature detection unit of the plurality of temperature detection units fails, the threshold value changing unit increases according to the number of batteries in the temperature detection range of the temperature detection unit that does not fail, Alternatively, each battery within the temperature detection range of the non-failed temperature detection unit in response to an increase in the distance between the non-failure temperature detection unit and each battery within the temperature detection range of the temperature detection unit The threshold is lowered by increasing the inter-battery temperature difference determined by the number of or the distance between the non-failing temperature detection unit and each battery within the temperature detection range of the temperature detection unit. apparatus. 請求項１または請求項２に記載の温度監視装置であって、
３つの前記温度検出部は、同一直線上に並ぶ複数の電池に所定数の電池間隔で設置され、
前記各電池は、前記３つの温度検出部のうち、隣り合う２つの温度検出部が故障すると、使用が禁止され、前記３つの温度検出部のうち、真ん中に位置する温度検出部を除く２つの温度検出部が故障すると、使用が継続される
ことを特徴とする温度監視装置。
The temperature monitoring device according to claim 1 or 2, wherein
The three temperature detection units are installed at a predetermined number of battery intervals on a plurality of batteries arranged on the same straight line,
Each of the batteries is prohibited from use if two adjacent temperature detection units out of the three temperature detection units fail, and two of the three temperature detection units except for the temperature detection unit located in the middle are prohibited. A temperature monitoring device that is used continuously when a temperature detection unit fails.
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