JP2019087457A - Abnormality detection device for secondary battery and electric vehicle provided with abnormality detection device - Google Patents

Abnormality detection device for secondary battery and electric vehicle provided with abnormality detection device Download PDF

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JP2019087457A
JP2019087457A JP2017215682A JP2017215682A JP2019087457A JP 2019087457 A JP2019087457 A JP 2019087457A JP 2017215682 A JP2017215682 A JP 2017215682A JP 2017215682 A JP2017215682 A JP 2017215682A JP 2019087457 A JP2019087457 A JP 2019087457A
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secondary battery
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拓也 大野
Takuya Ono
拓也 大野
北斗 横辻
Hokuto Yokotsuji
北斗 横辻
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Mitsubishi Motors Corp
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Abstract

To provide an abnormality detection device for a secondary battery that can determine quickly and accurately that there is an abnormal temperature rise inside the secondary battery, which may not lead to a decrease in battery performance (charge/discharge performance), a reduction in battery life, a failure, and the like.SOLUTION: An abnormality detection device includes a battery temperature estimation calculation unit 22 that calculates a measurement unit estimated temperature value (T) after predetermined time on the basis of a battery calorific value arithmetic value (q) calculated by a battery internal calorific value calculation unit 18 and a measurement unit calorific value arithmetic value (q) calculated by a measurement unit calorific value calculator 20, and a battery temperature rise abnormality determination control unit 24 that determines the temperature rise abnormality of the battery temperature of a secondary battery by comparing the actually measured temperature change value (T) measured by a measurement unit of the secondary battery with a measurement unit temperature change estimated value (T) obtained on the basis of the measurement unit temperature estimated value (T) calculated by the battery temperature estimation calculating unit.SELECTED DRAWING: Figure 1

Description

本開示は、例えば、パソコン、携帯電話、デジタルカメラ、ＰＤＡ(Ｐｅｒｓｏｎａｌ Ｄｉｇｉｔａｌ Ａｓｓｉｓｔａｎｃｅ)などの電子機器、電気自動車（ＥＶ）、ハイブリッドカー（ＨＶ）、プラグインハイブリッドカー（ＰＨＶ）などの車両（以下、単に「電動車両」と言う）に用いられる、ニッケル・カドミウム電池、ニッケル・水素電池、リチウムイオン電池などの二次電池（以下、単に「二次電池」と言う）において、二次電池の電池温度の温度上昇異常を検出するための二次電池の異常検出装置及び該異常検出装置を備えた電動車両に関する。   The present disclosure relates to, for example, a vehicle such as a personal computer, a mobile phone, a digital camera, an electronic device such as a PDA (Personal Digital Assistance), an electric vehicle (EV), a hybrid car (HV), a plug-in hybrid car (PHV) In secondary batteries such as nickel-cadmium batteries, nickel-hydrogen batteries, and lithium ion batteries (hereinafter simply referred to as “secondary batteries”) used in “electric vehicles”), battery temperatures of the secondary batteries The present invention relates to an abnormality detection device for a secondary battery for detecting an abnormality in temperature rise in a battery, and an electric vehicle equipped with the abnormality detection device.

従来、このような二次電池において、二次電池の内部における実際の温度上昇を測定することは不可能である。このような二次電池の内部において、異常な温度上昇があった場合には、電池性能（充放電性能）の低下や、電池寿命、故障などを招くおそれがある。   Conventionally, in such secondary batteries, it is impossible to measure the actual temperature rise inside the secondary battery. If there is an abnormal temperature rise inside such a secondary battery, the battery performance (charge / discharge performance) may be lowered, the battery life, failure or the like may occur.

このため、従来より、二次電池の温度変化に基づいて、想定される異常内容に応じた充放電制御を行うシステムの発明が種々行われている。
例えば、特許文献１（特開２０１０−２３１９６８号公報）では、充放電を安全に制御することを可能とする二次電池の制御装置が提案されている。 For this reason, various inventions of systems that perform charge / discharge control according to assumed abnormal contents based on temperature changes of the secondary battery have been conventionally performed.
For example, Patent Document 1 (Japanese Unexamined Patent Publication No. 2010-231968) proposes a control device for a secondary battery that can control charge and discharge safely.

特許文献１の二次電池の制御装置では、所定の時間間隔Δｔ毎に二次電池の状態を検知する検知手段と、検知された二次電池の状態から二次電池での発熱量を算出する発熱量推定手段とを備えている。   The control device for a secondary battery of Patent Document 1 calculates the calorific value of the secondary battery from the detection means for detecting the state of the secondary battery at predetermined time intervals Δt and the detected state of the secondary battery. And heat generation amount estimation means.

そして、算出された発熱量に基づいて、現時点から時間間隔Δｔ経過後の二次電池の内部温度を推定する将来内部温度推定手段を備えており、将来内部温度推定手段で二次電池の内部温度を推定する毎に、検知手段で二次電池の状態を検出するように構成されている。   And, the future internal temperature estimating means is provided for estimating the internal temperature of the secondary battery after the time interval Δt has elapsed from the current time based on the calculated calorific value, and the internal temperature of the secondary battery is estimated by the future internal temperature estimating means The detection means is configured to detect the state of the secondary battery each time it is estimated.

特開２０１０−２３１９６８号公報Unexamined-Japanese-Patent No. 2010-231968

ところで、このように構成される従来の特許文献１の二次電池の制御装置では、二次電池の状態を検知する検知手段が、所定の時間間隔Δｔ毎に、二次電池の外部温度を検知する温度検知手段である。   By the way, in the control device for the secondary battery of the conventional patent document 1 configured as described above, the detection means for detecting the state of the secondary battery detects the external temperature of the secondary battery at predetermined time intervals Δt. Temperature detection means.

また、予め求めた二次電池の外部温度と内部温度との対応関係を用いて、温度検知手段において検知された二次電池の外部温度から、現時点の内部温度を推定するように構成されている。   Further, the present internal temperature is estimated from the external temperature of the secondary battery detected by the temperature detection means using the correspondence relationship between the external temperature and the internal temperature of the secondary battery determined in advance. .

そして、推定された現時点の二次電池の内部温度と、時間間隔Δｔ前に検知された外部温度に基づいて推定された二次電池の将来内部温度との差が所定の許容温度差以上である場合、二次電池が異常であると判定する。   The difference between the estimated internal temperature of the secondary battery and the future internal temperature of the secondary battery estimated based on the external temperature detected before the time interval Δt is equal to or greater than a predetermined allowable temperature difference. In the case, it is determined that the secondary battery is abnormal.

しかしながら、二次電池の通電時の二次電池の発熱量と、二次電池の温度検知手段の付近の発熱量が、電池温度上昇に影響すると考えられるが、特許文献１の二次電池の異常判定では、二次電池の外部温度の計測のみで電池温度状態を推定する方法が用いられており、二次電池の通電時の二次電池の発熱量と、二次電池の温度検知手段の付近の発熱量は考慮されていない。   However, although it is considered that the calorific value of the secondary battery at the time of energization of the secondary battery and the calorific value near the temperature detection means of the secondary battery affect the battery temperature rise, the abnormality of the secondary battery of Patent Document 1 In the determination, the method of estimating the battery temperature state only by measuring the external temperature of the secondary battery is used, and the calorific value of the secondary battery at the time of energization of the secondary battery and the vicinity of the temperature detection means of the secondary battery The calorific value of is not considered.

従って、特許文献１の二次電池の異常判定では、二次電池の内部において異常な温度上昇を正確に検知することができず、このような二次電池の内部において異常な温度上昇があった場合には、電池性能（充放電性能）の低下や、電池寿命、故障などを招くおそれがある。   Therefore, in the abnormality determination of the secondary battery of Patent Document 1, an abnormal temperature rise can not be accurately detected inside the secondary battery, and there is an abnormal temperature rise inside such a secondary battery. In such a case, the battery performance (charge / discharge performance) may be lowered, the battery life, a failure or the like may be caused.

このような現状に鑑み、本発明の少なくとも一つの実施形態は、二次電池の内部において、異常な温度上昇があったことを迅速にかつ正確に判断可能で、異常な温度上昇による、電池性能（充放電性能）の低下や、電池寿命、故障などを招くおそれのない、二次電池の異常検出装置及び該異常検出装置を備えた電動車両を提供することを目的とする。   In view of such a present situation, at least one embodiment of the present invention can quickly and accurately judge that there is an abnormal temperature rise inside the secondary battery, and the battery performance due to the abnormal temperature rise An object of the present invention is to provide an abnormality detection device for a secondary battery and an electric vehicle provided with the abnormality detection device, which is not likely to cause a decrease in (charge and discharge performance), a battery life, and a failure.

前述したような従来技術における課題及び目的を達成するために発明されたものであって、本発明の少なくとも一つの実施形態は、二次電池の電池温度の温度上昇異常を検出するための二次電池の異常検出装置であって、前記二次電池の内部の電池発熱量を演算する電池内部発熱量演算部と、前記二次電池の計測部の計測部発熱量を演算する計測部発熱量演算部と、前記電池内部発熱量演算部で演算された電池発熱量演算値（ｑｉｎ）と前記計測部発熱量演算部で演算された計測部発熱量演算値（ｑｍ）とに基づいて、所定時間後の計測部温度推定値（Ｔ２ Ｋ）を演算する電池温度推定演算部と、前記電池温度推定演算部で演算された前記計測部温度推定値（Ｔ２ Ｋ）に基づいて得られた計測部温度変化推定値（Ｔ3 Ｋ）と前記二次電池の計測部で計測された実際の計測温度変化値（Ｔ4 Ｋ）とを比較して、前記二次電池の電池温度の温度上昇異常を判定する電池温度上昇異常判定制御部と、を備えることを特徴とする。 In order to achieve the problems and objects in the prior art as described above, at least one embodiment of the present invention is a secondary for detecting an abnormal temperature rise of a battery temperature of a secondary battery. A battery abnormality detection device, comprising: a battery internal heat generation amount calculation unit for calculating a battery heat generation amount inside the secondary battery; and a measurement unit heat generation amount calculation for calculating a heat generation amount of a measurement unit of the measurement unit of the secondary battery Based on the battery calorific value arithmetic value (q in ) calculated by the internal battery calorific value calculator and the measuring section calorific value arithmetic value (q m ) calculated by the measuring unit calorific value calculator a battery temperature estimation calculation section for calculating a predetermined time after the measurement portion temperature estimation value (T 2 K), obtained based on the battery temperature estimation the measuring part temperature estimates calculated by the calculation section (T 2 K) measurement unit temperature change estimation value (T 3 K) and the secondary By comparing the actual measured temperature change value measured by the measurement unit of the pond (T 4 K), and a battery temperature rise abnormality determination control section determines the temperature rise abnormality of the battery temperature of the secondary battery It is characterized by

このように構成することによって、電池温度推定演算部において、電池内部発熱量演算部で演算された電池発熱量演算値（ｑｉｎ）と、計測部発熱量演算部で演算された計測部発熱量演算値（ｑｍ）に基づいて、所定時間（Δｔ秒）後の計測部温度推定値（Ｔ２ Ｋ）を演算するように構成されている。 With this configuration, in the battery temperature estimation calculation unit, the battery heat generation calculation value (q in ) calculated by the battery internal heat generation calculation unit and the measurement unit heat generation amount calculated by the measurement unit heat generation calculation unit Based on the calculated value (q m ), the measurement unit temperature estimated value (T 2 K ) after a predetermined time (Δt second) is calculated.

そして、電池温度上昇異常判定制御部において、電池温度推定演算部で演算された計測部温度推定値（Ｔ２ Ｋ）に基づいて得られた計測部温度変化推定値（Ｔ3 Ｋ）と、二次電池の計測部で計測された実際の計測温度変化値（Ｔ4 Ｋ）を比較して、二次電池の電池温度の温度上昇異常を判定するように構成されている。 Then, in the battery temperature rise abnormality determination control unit, the measurement unit temperature change estimated value (T 3 K ) obtained based on the measurement unit temperature estimated value (T 2 K ) calculated by the battery temperature estimation calculation unit, compared actually measured temperature change value measured by the measurement unit of the next cell of (T 4 K), and is configured to determine the temperature rise abnormality of the battery temperature of the secondary battery.

すなわち、発熱を考慮することで計測部の計測部温度変化推定値（Ｔ3 Ｋ）を推定し、二次電池の計測部で計測された実際の計測温度変化値（Ｔ4 Ｋ）と比較することで、二次電池の電池温度の温度上昇異常を検出（判断）するように構成されている。 That is, the temperature change estimated value (T 3 K ) of the measurement part of the measurement part is estimated by considering the heat generation, and is compared with the actual measured temperature change value (T 4 K ) measured by the measurement part of the secondary battery. Thus, it is configured to detect (determine) the temperature rise abnormality of the battery temperature of the secondary battery.

従って、二次電池の内部において、異常な温度上昇があったことを迅速にかつ正確に判断可能で、異常な温度上昇による、電池性能（充放電性能）の低下や、電池寿命、故障などを招くおそれがない。   Therefore, it is possible to quickly and accurately judge that there is an abnormal temperature rise inside the secondary battery, and the battery performance (charge / discharge performance) declines due to the abnormal temperature rise, the battery life, failure etc. There is no risk of causing it.

また、幾つかの実施形態では、前記電池内部発熱量演算部においては、電池内部の内部抵抗値と電流値とに基づいて、前記二次電池内部の電池内部発熱量を演算するように構成されていることを特徴とする。   In some embodiments, the battery internal heat generation calculation unit is configured to calculate the battery internal heat generation amount inside the secondary battery based on the internal resistance value inside the battery and the current value. It is characterized by

このように構成することによって、電池内部発熱量演算部においては、電池内部の内部抵抗値（例えば、あらかじめ測定された抵抗値、又は二次電池の性能として設定されている抵抗値）と、電流値とに基づいて、二次電池内部の電池内部発熱量を演算するようになっている。
これにより、二次電池内部の電池内部発熱量を演算することにより、電池発熱量演算値（ｑｉｎ）を正確に得ることができる。 By configuring in this manner, in the battery internal heat generation amount calculation unit, the internal resistance value inside the battery (for example, the resistance value measured in advance or the resistance value set as the performance of the secondary battery) and the current Based on the value, the internal heat generation amount of the battery inside the secondary battery is calculated.
As a result, it is possible to accurately obtain the battery heating value calculation value (q in ) by calculating the battery internal heating value inside the secondary battery.

また、幾つかの実施形態では、前記計測部発熱量演算部においては、計測部の抵抗値と電流値とに基づいて、前記二次電池の計測部の発熱量を演算するように構成されていることを特徴とする。   In some embodiments, the measurement unit heat generation amount calculation unit is configured to calculate the heat generation amount of the measurement unit of the secondary battery based on the resistance value and the current value of the measurement unit. It is characterized by

このように構成することによって、計測部発熱量演算部においては、計測部の抵抗値（例えば、あらかじめ測定された抵抗値、又は計測部の性能として設定されている抵抗値）と電流値とに基づいて、二次電池の計測部の発熱量を演算するようになっている。
これにより、二次電池の計測部の発熱量を演算することにより、計測部発熱量演算値（ｑｍ）を正確に得ることができる。 By configuring in this manner, in the measurement unit calorific value calculation unit, the resistance value of the measurement unit (for example, the resistance value measured in advance or the resistance value set as the performance of the measurement unit) and the current value Based on this, the amount of heat generated by the measurement unit of the secondary battery is calculated.
Accordingly, the calorific value of the calorific value of the measurement part (q m ) can be accurately obtained by calculating the calorific value of the measurement part of the secondary battery.

また、幾つかの実施形態では、前記電池温度推定演算部においては、前記電池内部発熱量演算部で演算された電池発熱量演算値（ｑｉｎ）と、前記計測部発熱量演算部で演算された計測部発熱量演算値（ｑｍ）と、電池内部の電池熱容量（Ｃｉｎ）と、計測部の計測部熱容量（Ｃｍ）と、電池内部の電池熱抵抗（Ｒ１）と、計測部の熱抵抗（Ｒ２）との間の熱抵抗値（Ｒ１２）と、に基づいて、所定時間後の電池内部温度推定値（Ｔ1 Ｋ）と、所定時間後の計測部温度推定値（Ｔ２ Ｋ）と、を演算するように構成されていることを特徴とする。 In some embodiments, the battery temperature estimation calculation unit calculates the battery heat generation calculation value (q in ) calculated by the battery internal heat generation calculation unit and the measurement unit heat generation calculation unit. Measurement part calorific value calculated value (q m ), battery heat capacity (C in ) inside the battery, measurement part heat capacity (C m ) of the measurement part, battery heat resistance (R 1 ) inside the battery, measurement part The battery internal temperature estimated value (T 1 K ) after a predetermined time based on the thermal resistance value (R 12 ) between the thermal resistance (R 2 ) and the measurement part temperature estimated value after the predetermined time (T 1 K ) It is characterized in that it is configured to calculate T 2 K ) and

このように構成することによって、電池温度推定演算部において、電池発熱量演算値（ｑｉｎ）と、計測部発熱量演算値（ｑｍ）と、電池内部の電池熱容量（Ｃｉｎ）と、計測部の計測部熱容量（Ｃｍ）と、電池内部の電池熱抵抗（Ｒ１）と計測部の熱抵抗（Ｒ２）との間の熱抵抗値（Ｒ１２）とに基づいて、所定時間（Δｔ秒）後の電池内部温度推定値（Ｔ1 Ｋ）と、所定時間（Δｔ秒）後の計測部温度推定値（Ｔ２ Ｋ）とを演算することができる。 With this configuration, the battery temperature estimation calculation unit measures the battery calorific value (q in ), the calorific value calorific value (q m ), and the battery heat capacity (C in ) inside the battery. and parts of the measuring part the heat capacity (C m), based on battery thermal resistance inside the battery (R 1) and the thermal resistance between the heat resistance of the measuring unit (R 2) and (R 12) in a predetermined time ( The battery internal temperature estimated value (T 1 K ) after Δt seconds) and the measurement unit temperature estimated value (T 2 K ) after a predetermined time (Δt seconds) can be calculated.

また、幾つかの実施形態では、前記電池温度上昇異常判定制御部においては、前記電池温度推定演算部で演算された計測部温度推定値（Ｔ２ Ｋ）に基づいて得られた計測部温度変化推定値（Ｔ3 Ｋ）と、前記二次電池の計測部で計測された実際の計測温度変化値（Ｔ4 Ｋ）を比較して、計測温度変化値（Ｔ4 Ｋ）≧計測部温度変化推定値（Ｔ3 Ｋ）であって、前記計測温度変化値（Ｔ4 Ｋ）と計測部温度変化推定値（Ｔ3 Ｋ）との間の温度推定値差（Ｔ4 Ｋ−Ｔ3 Ｋ）が、所定の異常判定閾値を上回る場合に、前記二次電池の電池温度の温度上昇異常を判定するように構成されていることを特徴とする。 In some embodiments, in the battery temperature rise abnormality determination control unit, the measurement unit temperature change obtained based on the measurement unit temperature estimated value (T 2 K ) calculated by the battery temperature estimation calculation unit. Comparing the estimated value (T 3 K ) with the actual measured temperature change value (T 4 K ) measured by the measurement unit of the secondary battery, the measured temperature change value (T 4 K ) 計 測 measurement unit temperature change a estimate (T 3 K), the measured temperature change value (T 4 K) and the measuring unit temperature change estimation value estimated temperature difference between the (T 3 K) (T 4 K -T 3 K) However, the present invention is characterized in that it is configured to determine a temperature rise abnormality of the battery temperature of the secondary battery when the value exceeds a predetermined abnormality determination threshold.

このように構成することによって、計測温度変化値（Ｔ4 Ｋ）≧計測部温度変化推定値（Ｔ3 Ｋ）であって、計測温度変化値（Ｔ4 Ｋ）と計測部温度変化推定値（Ｔ3 Ｋ）との間の温度推定値差（Ｔ4 Ｋ−Ｔ3 Ｋ）が、所定の異常判定閾値を上回る場合に、前記二次電池の電池温度の温度上昇異常を判定するように構成されている。 By thus configuring, the measured temperature change value (T 4 K )) the measuring unit temperature change estimated value (T 3 K ), and the measured temperature change value (T 4 K ) and the measuring unit temperature change estimated value ( It is configured to determine the temperature rise abnormality of the battery temperature of the secondary battery when the temperature estimated value difference (T 4 K −T 3 K ) between T 3 K ) and the predetermined abnormality judgment threshold value is exceeded. It is done.

これにより、発熱を考慮することで計測部の計測部温度変化推定値（Ｔ3 Ｋ）を推定し、二次電池の計測部で計測された実際の計測温度変化値（Ｔ4 Ｋ）と比較することで、二次電池の電池温度の温度上昇異常を検出（判断）するように構成されている。 Thus, the estimated temperature change value (T 3 K ) of the measurement part of the measurement part is estimated by considering the heat generation, and compared with the actual measured temperature change value (T 4 K ) measured by the measurement part of the secondary battery. By doing this, the temperature rise abnormality of the battery temperature of the secondary battery is detected (judged).

従って、二次電池の内部において、異常な温度上昇があったことを迅速にかつ正確に判断可能で、異常な温度上昇による、電池性能（充放電性能）の低下や、電池寿命、故障などを招くおそれがない。   Therefore, it is possible to quickly and accurately judge that there is an abnormal temperature rise inside the secondary battery, and the battery performance (charge / discharge performance) declines due to the abnormal temperature rise, the battery life, failure etc. There is no risk of causing it.

また、幾つかの実施形態では、前記二次電池のＳＯＨ(Ｓｔａｔｅ ｏｆ Ｈｅａｌｔｈ、電池健全度)が低いほど、前記所定の異常判定閾値が小さくなるように設定されていることを特徴とする。   In some embodiments, the predetermined abnormality determination threshold is set to be smaller as the state of health (SOH) of the secondary battery is lower.

このように、二次電池のＳＯＨが低いほど、二次電池の内部抵抗が高くなって、発熱量が大きくなるので、判断基準を厳しくする必要があり、所定の異常判定閾値が小さくなるように設定されている。   As described above, the lower the SOH of the secondary battery, the higher the internal resistance of the secondary battery, and the larger the calorific value. Therefore, it is necessary to make the judgment criteria stricter, and the predetermined abnormality determination threshold value becomes smaller. It is set.

これにより、二次電池のＳＯＨが低い場合であっても、二次電池の内部において、異常な温度上昇があったことを迅速にかつ正確に判断可能で、異常な温度上昇による、電池性能（充放電性能）の低下や、電池寿命、故障などを招くおそれがない。   As a result, even when the SOH of the secondary battery is low, it is possible to quickly and accurately judge that there is an abnormal temperature rise inside the secondary battery, and the battery performance (abnormal temperature rise) ( There is no risk of deterioration of charge / discharge performance, battery life, failure or the like.

また、幾つかの実施形態では、前記二次電池の計測部が、二次電池のセル端子に設けられていることを特徴とする。   In some embodiments, the measurement unit of the secondary battery is provided at a cell terminal of the secondary battery.

このように、二次電池の計測部が、二次電池のセル端子に設けられているので、計測部の計測部温度変化推定値を推定し、二次電池の計測部で計測された実際の計測温度変化値と比較することで、二次電池のセル毎の電池温度の温度上昇異常を検出（判断）し易くなる。   As described above, since the measurement unit of the secondary battery is provided at the cell terminal of the secondary battery, the estimated temperature change value of the measurement unit of the measurement unit is estimated, and the actual measurement is performed by the measurement unit of the secondary battery. It becomes easy to detect (judge) temperature rise abnormality of the battery temperature for every cell of the secondary battery by comparing with the measurement temperature change value.

また、幾つかの実施形態では、前述のいずれかに記載の二次電池の異常検出装置を備えたことを特徴とする電動車両であることを特徴とする。   Moreover, some embodiments are characterized by being an electric vehicle including the secondary battery abnormality detection device described in any of the above.

これにより、電動車両に搭載される二次電池の内部において、異常な温度上昇があったことを迅速にかつ正確に判断可能で、異常な温度上昇による、電池性能（充放電性能）の低下による走行性能の低下や、電池寿命、故障などを招くおそれがない。   Thereby, it is possible to judge promptly and accurately that there is an abnormal temperature rise inside the secondary battery mounted on the electric vehicle, and the battery performance (charge / discharge performance) is lowered due to the abnormal temperature rise. There is no risk of deterioration in running performance, battery life, failure or the like.

本発明の一実施形態によれば、電池温度推定演算部において、電池内部発熱量演算部で演算された電池発熱量演算値（ｑｉｎ）と、計測部発熱量演算部で演算された計測部発熱量演算値（ｑｍ）に基づいて、所定時間（Δｔ秒）後の計測部温度推定値（Ｔ２ Ｋ）を演算するように構成されている。 According to one embodiment of the present invention, in the battery temperature estimation calculation unit, the battery heat generation calculation value (q in ) calculated by the battery internal heat generation calculation unit and the measurement unit calculated by the measurement unit heat generation calculation unit Based on the calorific value calculation value (q m ), the measurement part temperature estimated value (T 2 K ) after a predetermined time (Δt second) is calculated.

そして、電池温度上昇異常判定制御部において、電池温度推定演算部で演算された計測部温度推定値（Ｔ２ Ｋ）に基づいて得られた計測部温度変化推定値（Ｔ3 Ｋ）と、二次電池の計測部で計測された実際の計測温度変化値（Ｔ4 Ｋ）を比較して、二次電池の電池温度の温度上昇異常を判定するように構成されている。 Then, in the battery temperature rise abnormality determination control unit, the measurement unit temperature change estimated value (T 3 K ) obtained based on the measurement unit temperature estimated value (T 2 K ) calculated by the battery temperature estimation calculation unit, compared actually measured temperature change value measured by the measurement unit of the next cell of (T 4 K), and is configured to determine the temperature rise abnormality of the battery temperature of the secondary battery.

すなわち、発熱を考慮することで計測部の計測部温度変化推定値（Ｔ3 Ｋ）を推定し、二次電池の計測部で計測された実際の計測温度変化値（Ｔ4 Ｋ）と比較することで、二次電池の電池温度の温度上昇異常を検出（判断）するように構成されている。 That is, the temperature change estimated value (T 3 K ) of the measurement part of the measurement part is estimated by considering the heat generation, and is compared with the actual measured temperature change value (T 4 K ) measured by the measurement part of the secondary battery. Thus, it is configured to detect (determine) the temperature rise abnormality of the battery temperature of the secondary battery.

従って、二次電池の内部において、異常な温度上昇があったことを迅速にかつ正確に判断可能で、異常な温度上昇による、電池性能（充放電性能）の低下や、電池寿命、故障などを招くおそれがない。   Therefore, it is possible to quickly and accurately judge that there is an abnormal temperature rise inside the secondary battery, and the battery performance (charge / discharge performance) declines due to the abnormal temperature rise, the battery life, failure etc. There is no risk of causing it.

本発明の二次電池の異常検出装置の概略を示すブロック図である。It is a block diagram which shows the outline of the abnormality detection apparatus of the secondary battery of this invention. 本発明の二次電池の異常検出装置の電池内部発熱量演算部の概略を示すブロック図である。It is a block diagram which shows the outline of a battery internal heat generation calculating part of the abnormality detection apparatus of the secondary battery of this invention. 本発明の二次電池の異常検出装置の計測部発熱量演算部の概略を示すブロック図である。It is a block diagram which shows the outline of the measurement part emitted-heat amount calculating part of the abnormality detection apparatus of the secondary battery of this invention. 本発明の二次電池の異常検出装置の電池温度推定演算部の概略を示すブロック図である。It is a block diagram which shows the outline of the battery temperature estimation calculating part of the abnormality detection apparatus of the secondary battery of this invention. 本発明の二次電池の異常検出装置の電池温度上昇異常判定制御部の概略を示すブロック図である。It is a block diagram which shows the outline of the battery temperature rise abnormality determination control part of the abnormality detection apparatus of the secondary battery of this invention. 電池温度推定モデルを用いた温度推定を、電気回路的に表現した電池セルの熱モデルである。It is a thermal model of the battery cell which expressed the temperature estimation which used the battery temperature estimation model in the electric circuit. 二次電池１２の計測部１４が、二次電池１２のセル端子に設けられている状態を説明する二次電池１２の部分拡大側面図である。FIG. 6 is a partially enlarged side view of secondary battery 12 illustrating a state in which measurement unit 14 of secondary battery 12 is provided at a cell terminal of secondary battery 12.

以下、本発明の実施形態を図面に基づいてより詳細に説明する。   Hereinafter, embodiments of the present invention will be described in more detail based on the drawings.

ただし、実施形態として記載されている又は図面に示されている構成部品の寸法、材質、形状、その相対的配置等は、本発明の範囲をこれらに限定する趣旨ではなく、単なる説明例にすぎない。   However, the dimensions, materials, shapes, relative arrangements and the like of the components described as the embodiments or shown in the drawings are not intended to limit the scope of the present invention to these, but merely illustrative examples. Absent.

例えば、「同一」、「等しい」及び「均質」等の物事が等しい状態であることを表す表現は、厳密に等しい状態を表すのみならず、公差、若しくは、同じ機能が得られる程度の差が存在している状態も表すものとする。一方、一の構成要素を「備える」、「具える」、「具備する」、「含む」、又は、「有する」という表現は、他の構成要素の存在を除外する排他的な表現ではない。   For example, expressions that indicate that things such as "identical", "equal" and "homogeneous" are equal states not only represent strictly equal states, but also have tolerances or differences with which the same function can be obtained. It also represents the existing state. On the other hand, the expressions "comprising", "having", "having", "including" or "having" one component are not exclusive expressions excluding the presence of other components.

図１は、本発明の二次電池の異常検出装置の概略を示すブロック図、図２は、本発明の二次電池の異常検出装置の電池内部発熱量演算部の概略を示すブロック図、図３は、本発明の二次電池の異常検出装置の計測部発熱量演算部の概略を示すブロック図、図４は、本発明の二次電池の異常検出装置の電池温度推定演算部の概略を示すブロック図、図５は、本発明の二次電池の異常検出装置の電池温度上昇異常判定制御部の概略を示すブロック図、図６は、電池温度推定モデルを用いた温度推定を、電気回路的に表現した電池セルの熱モデル、図７は、二次電池１２の計測部１４が、二次電池１２のセル端子に設けられている状態を説明する二次電池１２の部分拡大側面図である。   FIG. 1 is a block diagram showing an outline of a secondary battery abnormality detection apparatus according to the present invention, and FIG. 2 is a block diagram showing an outline of a battery internal heat generation amount calculation unit of the secondary battery abnormality detection apparatus according to the present invention 3 is a block diagram showing an outline of a measurement portion calorific value calculation unit of the abnormality detection device for a secondary battery of the present invention, and FIG. 4 shows an outline of a battery temperature estimation operation portion of the abnormality detection device for a secondary battery FIG. 5 is a block diagram showing an outline of a battery temperature rise abnormality determination control unit of the secondary battery abnormality detection device of the present invention, and FIG. 6 is a circuit diagram showing temperature estimation using a battery temperature estimation model. FIG. 7 is a partially enlarged side view of the secondary battery 12 illustrating the state in which the measurement unit 14 of the secondary battery 12 is provided at the cell terminal of the secondary battery 12. is there.

図１〜図２において、符号１０は、全体で本発明の二次電池の異常検出装置を示している。   In FIGS. 1 and 2, reference numeral 10 generally indicates a secondary battery abnormality detection device of the present invention.

本発明の二次電池の異常検出装置１０は、例えば、パソコン、携帯電話、デジタルカメラ、ＰＤＡ(Ｐｅｒｓｏｎａｌ Ｄｉｇｉｔａｌ Ａｓｓｉｓｔａｎｃｅ)などの電子機器、電気自動車（ＥＶ）、ハイブリッドカー（ＨＶ）、プラグインハイブリッドカー（ＰＨＶ）などの車両（以下、単に「電動車両」と言う）に用いられる、ニッケル・カドミウム電池、ニッケル・水素電池、リチウムイオン電池などの二次電池（以下、単に「二次電池」と言う）に適用することができる。   The abnormality detection device 10 for a secondary battery according to the present invention is, for example, a personal computer, a mobile phone, a digital camera, an electronic device such as a PDA (Personal Digital Assistance), an electric car (EV), a hybrid car (HV), a plug-in hybrid car Nickel-cadmium batteries, nickel-hydrogen batteries, lithium-ion batteries and other secondary batteries (hereinafter referred to simply as "secondary batteries") used in vehicles such as (PHV) (hereinafter referred to simply as "electric vehicles") Can be applied to

図１に示したように、本発明の二次電池の異常検出装置１０は、特に、電動車両の駆動用電池としての二次電池１２の電池温度の温度上昇異常を検出するための二次電池の異常検出装置である。
そして、本発明の二次電池の異常検出装置１０は、二次電池１２の計測部１４と接続されている異常検出制御部１６を備えている。 As shown in FIG. 1, the secondary battery abnormality detection apparatus 10 of the present invention is particularly a secondary battery for detecting a temperature rise abnormality of a battery temperature of the secondary battery 12 as a drive battery of an electric vehicle. Anomaly detection device.
And the abnormality detection apparatus 10 of the secondary battery of this invention is equipped with the abnormality detection control part 16 connected with the measurement part 14 of the secondary battery 12. FIG.

また、図１、図２に示したように、異常検出制御部１６は、二次電池１２の内部の電池発熱量演算値（ｑｉｎ）を演算する電池内部発熱量演算部１８を備えている。 Further, as shown in FIGS. 1 and 2, the abnormality detection control unit 16 includes a battery internal heat generation amount calculation unit 18 that calculates a battery heat generation calculation value (q in ) inside the secondary battery 12. .

さらに、図１、図３に示したように、異常検出制御部１６は、二次電池１２の計測部１４の計測部発熱量演算値（ｑｍ）を演算する計測部発熱量演算部２０を備えている。 Furthermore, as shown in FIG. 1 and FIG. 3, the abnormality detection control unit 16 calculates the calorific value calorific value calculating unit 20 that calculates the calorific value calorific value (q m ) of the measuring unit of the measuring unit 14 of the secondary battery 12. Have.

また、図１、図４に示したように、異常検出制御部１６は、所定時間Δｔ秒後の計測部温度推定値（Ｔ２ Ｋ）を演算する電池温度推定演算部２２を備えている。 Further, as shown in FIG. 1 and FIG. 4, the abnormality detection control unit 16 includes a battery temperature estimation calculation unit 22 that calculates an estimated measurement unit temperature value (T 2 K ) after a predetermined time Δt seconds.

図４に示したように、電池温度推定演算部２２では、後述するように、電池内部発熱量演算部１８で演算された電池発熱量演算値（ｑｉｎ）と、計測部発熱量演算部２０で演算された計測部発熱量演算値（ｑｍ）に基づいて、所定時間Δｔ秒後の計測部温度推定値（Ｔ２ Ｋ）を演算するように構成されている。 As shown in FIG. 4, in the battery temperature estimation calculation unit 22, as described later, the battery heat generation calculation value (q in ) calculated by the battery internal heat generation calculation unit 18 and the measurement unit heat generation calculation unit 20. It is configured to calculate an estimated measured temperature value (T 2 K ) after a predetermined time Δt second based on the calculated calculated calorific value (q m ) of the measured heat amount.

さらに、図１、図５に示したように、異常検出制御部１６は、電池温度上昇異常判定制御部２４を備えている。   Further, as shown in FIGS. 1 and 5, the abnormality detection control unit 16 includes a battery temperature rise abnormality determination control unit 24.

図５に示したように、電池温度上昇異常判定制御部２４では、後述するように、電池温度推定演算部２２で演算された計測部温度推定値（Ｔ２ Ｋ）に基づいて得られた計測部温度変化推定値（Ｔ3 Ｋ）と、二次電池１２の計測部１４で計測された実際の計測温度変化値（Ｔ4 Ｋ）を比較して、二次電池１２の電池温度の温度上昇異常を判定するように構成されている。 As shown in FIG. 5, the battery temperature increase abnormality determination control unit 24, as described later, the measurement obtained on the basis of the calculated measurement unit temperature estimate the battery temperature estimation calculation unit 22 (T 2 K) The temperature rise of the battery temperature of the secondary battery 12 by comparing the estimated temperature change value (T 3 K ) with the actual measured temperature change value (T 4 K ) measured by the measurement unit 14 of the secondary battery 12 It is configured to determine an abnormality.

具体的には、このように構成される異常検出制御部１６の電池内部発熱量演算部１８には、図２に示したように、別途設けられた内部抵抗演算部２６で、予め演算された二次電池１２の内部抵抗値２８が入力されるようになっている。なお、この内部抵抗値２８は、あらかじめ測定された抵抗値、又は二次電池１２の性能として設定されている抵抗値である。   Specifically, as shown in FIG. 2, the battery internal heat generation amount calculation unit 18 of the abnormality detection control unit 16 configured as described above is calculated in advance by an internal resistance calculation unit 26 provided separately. The internal resistance value 28 of the secondary battery 12 is input. The internal resistance value 28 is a resistance value measured in advance or a resistance value set as the performance of the secondary battery 12.

また、電池内部発熱量演算部１８には、図示しない電流測定部で測定された二次電池１２の内部を流れる電流値３０が入力される。   Further, a current value 30 flowing through the inside of the secondary battery 12 measured by a current measurement unit (not shown) is input to the battery internal heat generation amount calculation unit 18.

そして、電池内部発熱量演算部１８では、これらの内部抵抗値２８、電流値３０に基づいて、二次電池１２の内部の電池発熱量演算値（ｑｉｎ）を演算するように構成されている。例えば、電池発熱量演算値（ｑｉｎ）＝電流値（Ｉｉｎ）２×二次電池内部抵抗値（Ｒｉｎ）によって算出される。 The battery internal heat generation amount calculation unit 18 is configured to calculate the internal battery heat generation calculation value (q in ) of the secondary battery 12 based on the internal resistance value 28 and the current value 30. . For example, it is calculated by the battery calorific value operation value (q in ) = current value (I in ) 2 × secondary battery internal resistance value (R in ).

さらに、図３に示したように、異常検出制御部１６の計測部発熱量演算部２０には、二次電池１２の計測部１４における計測部電気抵抗値３２が入力されるようになっている。なお、この計測部電気抵抗値３２は、あらかじめ測定された抵抗値、又は計測部の性能として設定されている抵抗値である。   Furthermore, as shown in FIG. 3, the measuring unit electric resistance value 32 in the measuring unit 14 of the secondary battery 12 is input to the measuring unit calorific value calculation unit 20 of the abnormality detection control unit 16. . The measurement unit electrical resistance value 32 is a resistance value measured in advance, or a resistance value set as performance of the measurement unit.

また、計測部発熱量演算部２０には、二次電池１２の計測部１４を流れる電流値３４が入力される。   Further, the current value 34 flowing through the measurement unit 14 of the secondary battery 12 is input to the measurement unit calorific value calculation unit 20.

そして、計測部発熱量演算部２０では、これらの計測部電気抵抗値３２、電流値３４に基づいて、二次電池１２の計測部１４の計測部発熱量演算値（ｑｍ）を演算するように構成されている。例えば、計測部発熱量演算値（ｑｍ）＝電流値（Ｉｍ）２×計測部内部抵抗値（Ｒｍ）によって算出される。 Then, in the measurement unit heat generation amount calculation unit 20, the calculation unit heat generation amount calculation value (q m ) of the measurement unit 14 of the secondary battery 12 is calculated based on the measurement unit electric resistance value 32 and the current value 34. Is configured. For example, it is calculated by: calorific value calorific value calculated value (q m ) = current value (I m ) 2 × internal resistance value (R m ) of the measuring part.

また、図４の符号３６で示したように、異常検出制御部１６の電池温度推定演算部２２には、電池内部発熱量演算部１８で演算された電池発熱量演算値（ｑｉｎ）が入力されるようになっている。 Further, as indicated by reference numeral 36 in FIG. 4, the battery temperature estimation calculation unit 22 of the abnormality detection control unit 16 receives the battery heat generation calculation value (q in ) calculated by the battery internal heat generation calculation unit 18. It is supposed to be

また、図４の符号３８で示したように、電池温度推定演算部２２には、計測部発熱量演算部２０で演算された計測部発熱量演算値（ｑｍ）が入力されるようになっている。 Further, as indicated by reference numeral 38 in FIG. 4, the battery temperature estimation calculation unit 22 receives the measurement unit calorific value calculation value (q m ) calculated by the measurement unit calorific value calculation unit 20. ing.

さらに、図４の符号４０で示したように、電池温度推定演算部２２には、予め測定された又は二次電池１２の性能として設定されている二次電池１２の電池内部の電池熱容量（Ｃｉｎ）が入力されるようになっている。
また、図４の符号４２で示したように、電池温度推定演算部２２には、予め測定された又は計測部１４の性能として設定されている計測部１４の計測部熱容量（Ｃｍ）が入力されるようになっている。 Furthermore, as indicated by the reference numeral 40 in FIG. 4, the battery temperature capacity inside the battery of the secondary battery 12 measured in advance or set as the performance of the secondary battery 12 in the battery temperature estimation calculation unit 22 (C in ) is to be input.
Further, as indicated by reference numeral 42 in FIG. 4, the battery temperature estimation calculation unit 22 receives the measurement unit heat capacity (C m ) of the measurement unit 14 which is measured in advance or set as the performance of the measurement unit 14. It is supposed to be

また、図４の符号４４で示したように、予め測定され又は性能として設定されている電池内部の電池熱抵抗（Ｒ１）と、計測部の熱抵抗（Ｒ２）との間の熱抵抗値（Ｒ１２）が入力されるようになっている。 In addition, as indicated by reference numeral 44 in FIG. 4, the thermal resistance between the battery thermal resistance (R 1 ) inside the battery, which is previously measured or set as the performance, and the thermal resistance (R 2 ) of the measurement unit The value (R 12 ) is to be input.

そして、図４に示したように、電池温度推定演算部２２では、これらの電池発熱量演算値（ｑｉｎ）と、計測部発熱量演算値（ｑｍ）と、二次電池１２の電池内部の電池熱容量（Ｃｉｎ）と、計測部１４の計測部熱容量（Ｃｍ）と、熱抵抗値（Ｒ１２）とに基づいて、図４の符号４６で示したように、所定時間Δｔ秒後の電池内部温度推定値（Ｔ1 Ｋ）と、図４の符号４８で示したように、所定時間Δｔ秒後の計測部温度推定値（Ｔ２ Ｋ）とを演算するように構成されている。 Then, as shown in FIG. 4, in the battery temperature estimation calculation unit 22, the battery heat generation calculation value (q in ), the measurement unit heat generation calculation value (q m ), and the inside of the battery of the secondary battery 12 As indicated by reference numeral 46 in FIG. 4, after a predetermined time Δt, based on the battery heat capacity (C in ) of the battery, the measurement unit heat capacity (C m ) of the measurement unit 14, and the heat resistance value (R 12 ) The battery internal temperature estimated value (T 1 K ) and the measuring unit temperature estimated value (T 2 K ) after a predetermined time Δt seconds are calculated as indicated by reference numeral 48 in FIG. 4 .

より詳細には、この電池温度推定演算部２２における演算は、図６に示したように、電池温度推定モデルを用いた温度推定を、電気回路的に表現した電池セルの熱モデルに基づいて、演算がなされて、所定時間Δｔ秒後の電池内部温度推定値（Ｔ1 Ｋ）と、所定時間Δｔ秒後の計測部温度推定値（Ｔ２ Ｋ）が演算されるようになっている。 More specifically, as shown in FIG. 6, the calculation in the battery temperature estimation calculation unit 22 is based on a battery cell thermal model in which the temperature estimation using the battery temperature estimation model is expressed in an electrical circuit manner. The calculation is performed to calculate the battery internal temperature estimated value (T 1 K ) after a predetermined time Δt second and the measuring unit temperature estimated value (T 2 K ) after the predetermined time Δt second.

すなわち、下記の数式（１）、（２）は、電池内部温度Ｔ１、計測部温度Ｔ２に関して整理した状態方程式である。   That is, the following equations (1) and (2) are state equations organized with respect to the battery internal temperature T1 and the measuring unit temperature T2.

これらの数式（１）、（２）に基づいて、所定時間Δｔ秒後の電池内部温度推定値（Ｔ1 Ｋ）と、所定時間Δｔ秒後の計測部温度推定値（Ｔ２ Ｋ）が演算されるようになっている。ｋは今回推定値を意味し、ｋ−１は前回推定値を意味することを示している。 Based on these equations (1) and (2), the battery internal temperature estimated value (T 1 K ) after a predetermined time Δt second and the measuring unit temperature estimated value (T 2 K ) after a predetermined time Δt second are calculated It is supposed to be k represents the current estimated value, and k-1 represents the previous estimated value.

Figure 2019087457
Figure 2019087457

Figure 2019087457
Figure 2019087457

ここで、Ｔ1は、電池内部温度、Ｔ２は、計測部温度、ｑｉｎは、セル発熱量、ｑｍは、計測部付近発熱量、Ｒ１２は、Ｔ1−Ｔ２間の熱抵抗、Ｃｉｎは、電池セル熱容量、Ｃｍは、計測部熱容量である。 Here, T 1 is the battery internal temperature, T 2 is the measurement unit temperature, q in is the cell calorific value, q m is the calorific value near the measurement unit, and R 12 is the thermal resistance between T 1 and T 2 , C in is a battery cell heat capacity, and C m is a measurement portion heat capacity.

また、電池内部温度、Ｔ２は、は、実際に計測を行う。さらに、セル発熱量ｑｉｎ、計測部付近発熱量ｑｍは、計測値より演算する。 The battery internal temperature, T 2 is performs actually measured. Furthermore, the cell heat generation amount q in and the heat generation amount q m near the measurement unit are calculated from the measurement values.

また、Ｔ1−Ｔ２間の熱抵抗Ｒ１２、電池セル熱容量Ｃｉｎ、計測部熱容量Ｃｍは、電池セル試験や電池セルの性能として設定されている値により決定する。 The heat resistance R 12 between T 1 -T 2, cell capacity C in, measuring unit heat capacity C m is determined by the value set as the performance of the battery cell test and the battery cell.

そして、二次電池１２が、定常状態であれば、Ｔ1＝Ｔ２であるので、初期値は、Ｔ1＝Ｔ２とする。 When the secondary battery 12 is in the steady state, T 1 = T 2 , so the initial value is T 1 = T 2 .

そして、上記の数式（１）、（２）に基づいて、発熱量を考慮した所定時間Δｔ秒後の電池内部温度推定値（Ｔ1 Ｋ）と、所定時間Δｔ秒後の計測部温度推定値（Ｔ２ Ｋ）が演算されるようになっている。 Then, the above equation (1), (2) on the basis of the battery internal temperature estimate value after a predetermined time Δt seconds in consideration of the heat generation amount and (T 1 K), a predetermined time Δt seconds after measurement unit temperature estimate (T 2 K ) is to be calculated.

なお、初回の演算以降は、前回演算値を用いることで、所定時間Δｔ秒後の電池内部温度推定値（Ｔ1 Ｋ）と、所定時間Δｔ秒後の計測部温度推定値（Ｔ２ Ｋ）が演算されるようになっている。 In addition, after the first calculation, the battery internal temperature estimated value (T 1 K ) after the predetermined time Δt seconds and the measuring unit temperature estimated value (T 2 K ) after the predetermined time Δt seconds by using the previous calculated value Is calculated.

一方、図５に示したように、異常検出制御部１６の電池温度上昇異常判定制御部２４には、計測部温度変化演算部５０を備えている。   On the other hand, as shown in FIG. 5, the battery temperature rise abnormality determination control unit 24 of the abnormality detection control unit 16 includes a measurement unit temperature change calculation unit 50.

そして、図５の符号５２で示したように、計測部温度変化演算部５０には、電池温度推定演算部２２で演算された計測部温度推定値（Ｔ２ Ｋ）が、入力されるようになっている。
また、図５の符号５４で示したように、計測部温度変化演算部５０には、現在の二次電池１２の計測部１４で計測された実際の計測温度（Ｔｍ）が、入力されるようになっている。 Then, as indicated by reference numeral 52 in FIG. 5, the measurement unit temperature change calculation unit 50 receives the measurement unit temperature estimated value (T 2 K ) calculated by the battery temperature estimation calculation unit 22. It has become.
In addition, as indicated by reference numeral 54 in FIG. 5, the actual measurement temperature (Tm) measured by the current measurement unit 14 of the secondary battery 12 is input to the measurement unit temperature change calculation unit 50. It has become.

そして、図５の符号５６で示したように、計測部温度変化演算部５０では、これらの計測部温度推定値（Ｔ２ Ｋ）、計測温度（Ｔｍ）から、計測部温度変化推定値（Ｔ3 Ｋ）が、演算されるようになっている。
すなわち、現在の計測温度（Ｔｍ）と、所定時間Δｔ秒後の計測部温度推定値（Ｔ２ Ｋ）から所定時間Δｔ秒の間に変化する計測部温度変化推定値（Ｔ3 Ｋ）が、演算されるようになっている。 Then, as indicated by reference numeral 56 in FIG. 5, the measuring unit temperature change calculating unit 50 estimates the measuring unit temperature change (T from the estimated temperature (T 2 K ) of the measuring unit) and the measured temperature (Tm). 3 K ) is to be calculated.
That is, the current measured temperature (Tm) and the estimated temperature change value (T 3 K ) that changes between the estimated temperature value (T 2 K ) after the predetermined time Δt second and the measured temperature change (T 3 K ) during the predetermined time Δt seconds are It is designed to be calculated.

さらに、図５の符号５８に示したように、電池温度上昇異常判定制御部２４では、計測部温度変化推定値（Ｔ3 Ｋ）と、二次電池１２の計測部１４で計測された実際の計測温度変化値（Ｔ4 Ｋ）を比較するように構成されている。 Furthermore, as indicated by reference numeral 58 in FIG. 5, in the battery temperature rise abnormality determination control unit 24, the measurement unit temperature change estimated value (T 3 K ) and the actual value measured by the measurement unit 14 of the secondary battery 12. It is configured to compare measured temperature change values (T 4 K ).

そして、図５の符号６０で示したように、
計測温度変化値（Ｔ4 Ｋ）≧計測部温度変化推定値（Ｔ3 Ｋ）であって、計測温度変化値（Ｔ4 Ｋ）と計測部温度変化推定値（Ｔ3 Ｋ）との間の温度推定値差（Ｔ4 Ｋ−Ｔ3 Ｋ）が、所定の異常判定閾値を上回る場合に、
図５の符号６２で示したように、二次電池１２の電池温度の温度上昇異常を判定して、温度上昇異常判定フラグが出力されるように構成されている。 And, as indicated by reference numeral 60 in FIG.
Measurement temperature change value (T 4 K )) measurement part temperature change estimation value (T 3 K ), and between the measurement temperature change value (T 4 K ) and measurement part temperature change estimation value (T 3 K ) When the temperature estimated value difference (T 4 K −T 3 K ) exceeds a predetermined abnormality determination threshold,
As indicated by reference numeral 62 in FIG. 5, the temperature rise abnormality of the battery temperature of the secondary battery 12 is determined, and the temperature rise abnormality determination flag is output.

このように構成される本実施形態の二次電池の異常検出装置１０によれば、電池温度推定演算部２２において、電池内部発熱量演算部１８で演算された電池発熱量演算値（ｑｉｎ）と、計測部発熱量演算部２０で演算された計測部発熱量演算値（ｑｍ）に基づいて、所定時間（Δｔ秒）後の計測部温度推定値（Ｔ２ Ｋ）を演算するように構成されている。 According to the abnormality detection device 10 for a secondary battery of the present embodiment configured as described above, the battery heat generation calculation value (q in ) calculated by the battery internal heat generation calculation unit 18 in the battery temperature estimation calculation unit 22 Based on the calorific value calorific value (q m ) calculated by the calorific value calorific value arithmetic unit 20, the calorific part temperature estimated value (T 2 K ) after a predetermined time (Δt second) is calculated. It is configured.

そして、電池温度上昇異常判定制御部２４において、電池温度推定演算部２２で演算された計測部温度推定値（Ｔ２ Ｋ）に基づいて得られた計測部温度変化推定値（Ｔ3 Ｋ）と、二次電池１２の計測部１４で計測された実際の計測温度変化値（Ｔ4 Ｋ）を比較して、二次電池１２の電池温度の温度上昇異常を判定するように構成されている。 Then, in the battery temperature rise abnormality determination control unit 24, with the measurement unit temperature change estimated value (T 3 K ) obtained based on the measurement unit temperature estimated value (T 2 K ) calculated by the battery temperature estimation calculation unit 22 The temperature measurement abnormality of the battery temperature of the secondary battery 12 is determined by comparing the actual measured temperature change value (T 4 K ) measured by the measurement unit 14 of the secondary battery 12.

すなわち、発熱を考慮することで計測部１４の計測部温度変化推定値（Ｔ3 Ｋ）を推定し、二次電池１２の計測部１４で計測された実際の計測温度変化値（Ｔ4 Ｋ）と比較することで、二次電池１２の電池温度の温度上昇異常を検出（判断）するように構成されている。 That is, the temperature change estimated value (T 3 K ) of the measurement unit 14 of the measurement unit 14 is estimated by considering the heat generation, and the actually measured temperature change value (T 4 K ) measured by the measurement unit 14 of the secondary battery 12 It is comprised so that the temperature rise abnormality of the battery temperature of the secondary battery 12 may be detected (judged) by comparing with.

従って、二次電池１２の内部において、異常な温度上昇があったことを迅速にかつ正確に判断可能で、異常な温度上昇による、電池性能（充放電性能）の低下や、電池寿命、故障などを招くおそれがない。
なお、二次電池１２のＳＯＨが低いほど、所定の異常判定閾値が小さくなるように設定されているのが望ましい。 Therefore, it is possible to judge promptly and accurately that there is an abnormal temperature rise inside the secondary battery 12, and the battery performance (charge / discharge performance) declines due to the abnormal temperature rise, the battery life, the failure, etc. There is no risk of
It is desirable that the predetermined abnormality determination threshold be set to be smaller as the SOH of the secondary battery 12 is lower.

このように、二次電池１２のＳＯＨが低いほど、二次電池１２の内部抵抗が高くなって、発熱量が大きくなるので、判断基準を厳しくする必要があり、所定の異常判定閾値が小さくなるように設定されている。   As described above, as the SOH of the secondary battery 12 is lower, the internal resistance of the secondary battery 12 is higher, and the calorific value is larger. Therefore, it is necessary to make the judgment criteria stricter, and the predetermined abnormality determination threshold becomes smaller. Is set as.

これにより、二次電池１２のＳＯＨが低い場合であっても、二次電池１２の内部において、異常な温度上昇があったことを迅速にかつ正確に判断可能で、異常な温度上昇による、電池性能（充放電性能）の低下や、電池寿命、故障などを招くおそれがない。   As a result, even if the SOH of the secondary battery 12 is low, it is possible to quickly and accurately determine that there is an abnormal temperature rise inside the secondary battery 12, and the battery due to the abnormal temperature rise There is no risk of deterioration in performance (charge / discharge performance), battery life, failure or the like.

さらに、二次電池１２の計測部１４を設ける位置としては、二次電池１２の電極端子の近傍であれば、特に限定されるものではないが、例えば、二次電池１２の計測部１４が、二次電池１２を構成する複数の電池セル６４のセル端子６８にそれぞれ設けられているのが望ましい。   Further, the position at which the measurement unit 14 of the secondary battery 12 is provided is not particularly limited as long as it is in the vicinity of the electrode terminal of the secondary battery 12, but for example, the measurement unit 14 of the secondary battery 12 is It is desirable that each of the cell terminals 68 of the plurality of battery cells 64 that constitute the secondary battery 12 be provided.

例えば、図７に示したように、二次電池１２の電池セル６４の電極端子６６には、セル端子６８が設けられ、このセル端子６８に、基板７０が、ボルトなどの締結部材７２により連結されている。そして、この基板７０の上面に、計測部１４を設けるように構成すれば良い。   For example, as shown in FIG. 7, a cell terminal 68 is provided on the electrode terminal 66 of the battery cell 64 of the secondary battery 12, and the substrate 70 is connected to the cell terminal 68 by a fastening member 72 such as a bolt. It is done. Then, the measuring unit 14 may be provided on the upper surface of the substrate 70.

なお、図７中、セル端子６８と基板７０との接触部分の間に屈曲形状の可撓性部分７４が設けられている。これにより、セル端子６８は、可撓性部分７４によって、上下方向に撓むことが可能であり、セル端子６８と基板７０とを確実に接触させて、締結部材７２により締結することができるようになっている。   In FIG. 7, a flexible portion 74 having a bent shape is provided between the contact portion of the cell terminal 68 and the substrate 70. Thus, the cell terminal 68 can be bent in the vertical direction by the flexible portion 74, so that the cell terminal 68 and the substrate 70 can be reliably brought into contact with each other and can be fastened by the fastening member 72. It has become.

このように、二次電池１２の計測部１４が、二次電池１２のセル端子６８に設けられていれば、計測部１４の計測部温度変化推定値（Ｔ3 Ｋ）を推定し、二次電池１２の計測部１４で計測された実際の計測温度変化値（Ｔ4 Ｋ）と比較することで、二次電池１２を構成する複数の電池セル６４のそれぞれについて、電池温度の温度上昇異常を検出（判断）し易くなる。 Thus, if the measurement unit 14 of the secondary battery 12 is provided at the cell terminal 68 of the secondary battery 12, the measurement unit temperature change estimated value (T 3 K ) of the measurement unit 14 is estimated, and the secondary By comparing with the actual measured temperature change value (T 4 K ) measured by the measurement unit 14 of the battery 12, the temperature rise abnormality of the battery temperature is obtained for each of the plurality of battery cells 64 constituting the secondary battery 12. It becomes easy to detect (determine).

以上、本発明の好ましい実施の態様を説明してきたが、本発明はこれに限定されることはなく、本発明の目的を逸脱しない範囲で種々の変更が可能である。   Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications can be made without departing from the object of the present invention.

本開示は、例えば、パソコン、携帯電話、デジタルカメラ、ＰＤＡなどの電子機器、電気自動車（ＥＶ）、ハイブリッドカー（ＨＶ）、プラグインハイブリッドカー（ＰＨＶ）などの電動車両に用いられる、ニッケル・カドミウム電池、ニッケル・水素電池、リチウムイオン電池などの二次電池において、二次電池の電池温度の温度上昇異常を迅速にかつ正確に判断できるので、二次電池の異常検出装置への利用に適用することができる。   The present disclosure relates to, for example, nickel-cadmium used for electric vehicles such as personal computers, mobile phones, digital cameras, electronic devices such as PDAs, electric vehicles (EVs), hybrid cars (HVs), and plug-in hybrid cars (PHVs). In secondary batteries such as batteries, nickel hydrogen batteries, lithium ion batteries, etc., it is possible to judge the temperature rise abnormality of the battery temperature of the secondary battery quickly and accurately, so it is applied to the application to the abnormality detection device of the secondary battery be able to.

１０ 二次電池の異常検出装置
１２ 二次電池
１４ 計測部
１６ 異常検出制御部
１８ 電池内部発熱量演算部
２０ 計測部発熱量演算部
２２ 電池温度推定演算部
２４ 電池温度上昇異常判定制御部
２６ 内部抵抗演算部
２８ 内部抵抗値
３０ 電流値
３２ 計測部電気抵抗値
３４ 電流値
５０ 計測部温度変化演算部
６４ 電池セル
６６ 電極端子
６８ セル端子
７０ 基板
７２ 締結部材
７４ 可撓性部分
Ｃｉｎ 電池セル熱容量
Ｃｍ 計測部熱容量
Ｒ１２ 熱抵抗
Ｔ1 電池内部温度
Ｔ２ 計測部温度
ｑｉｎ セル発熱量
ｑｍ 計測部付近発熱量
Δｔ 所定時間 10 secondary battery abnormality detection device 12 secondary battery 14 measurement unit 16 abnormality detection control unit 18 battery internal heat generation amount calculation unit 20 measurement unit heat generation amount calculation unit 22 battery temperature estimation calculation unit 24 battery temperature rise abnormality determination control unit 26 inside Resistance calculation unit 28 internal resistance value 30 current value 32 measurement unit electric resistance value 34 current value 50 measurement unit temperature change calculation unit 64 battery cell 66 electrode terminal 68 cell terminal 70 substrate 72 fastening member 74 flexible portion C in battery cell heat capacity C m measurement unit heat capacity R 12 thermal resistance T 1 battery internal temperature T 2 measurement unit temperature q in- cell calorific value q m calorific value near calorific value Δt predetermined time

Claims (8)

二次電池の電池温度の温度上昇異常を検出するための二次電池の異常検出装置であって、
前記二次電池の内部の電池発熱量を演算する電池内部発熱量演算部と、
前記二次電池の計測部の計測部発熱量を演算する計測部発熱量演算部と、
前記電池内部発熱量演算部で演算された電池発熱量演算値（ｑｉｎ）と前記計測部発熱量演算部で演算された計測部発熱量演算値（ｑｍ）とに基づいて、所定時間後の計測部温度推定値（Ｔ２ Ｋ）を演算する電池温度推定演算部と、
前記電池温度推定演算部で演算された前記計測部温度推定値（Ｔ２ Ｋ）に基づいて得られた計測部温度変化推定値（Ｔ3 Ｋ）と前記二次電池の計測部で計測された実際の計測温度変化値（Ｔ4 Ｋ）とを比較して、前記二次電池の電池温度の温度上昇異常を判定する電池温度上昇異常判定制御部と、
を備えることを特徴とする二次電池の異常検出装置。 An abnormality detection device for a secondary battery for detecting a temperature rise abnormality of a battery temperature of the secondary battery, comprising:
A battery internal heat generation amount calculation unit for calculating a battery heat generation amount inside the secondary battery;
A measurement unit calorific value calculation unit that calculates a calorific value of a measurement unit of a measurement unit of the secondary battery;
After a predetermined time based on the battery calorific value calculation value (q in ) calculated by the battery internal calorific value calculation unit and the measurement unit calorific value calculation value (q m ) calculated by the measurement unit calorific value calculation unit A battery temperature estimation calculation unit that calculates an estimated temperature value (T 2 K ) of the measurement unit of
Measured by the measuring unit temperature change estimated value (T 3 K ) obtained based on the measured unit temperature estimated value (T 2 K ) calculated by the battery temperature estimation calculating unit and by the measuring unit of the secondary battery A battery temperature rise abnormality determination control unit that determines a temperature rise abnormality of the battery temperature of the secondary battery by comparing it with an actual measured temperature change value (T 4 K );
An abnormality detection device for a secondary battery, comprising: 前記電池内部発熱量演算部においては、電池内部の内部抵抗値と電流値とに基づいて、前記二次電池内部の電池内部発熱量を演算するように構成されていることを特徴とする請求項１に記載の二次電池の異常検出装置。   The battery internal heat generation amount calculation unit is configured to calculate the battery internal heat generation amount inside the secondary battery based on the internal resistance value inside the battery and the current value. The secondary battery abnormality detection device according to 1. 前記計測部発熱量演算部においては、計測部の抵抗値と電流値とに基づいて、前記二次電池の計測部の発熱量を演算するように構成されていることを特徴とする請求項１又は２のいずれかに記載の二次電池の異常検出装置。   The heat generation amount calculation unit of the measurement unit is configured to calculate the heat generation amount of the measurement unit of the secondary battery based on the resistance value and the current value of the measurement unit. Or the abnormality detection apparatus of the secondary battery in any one of 2. 前記電池温度推定演算部においては、
前記電池内部発熱量演算部で演算された電池発熱量演算値（ｑｉｎ）と、前記計測部発熱量演算部で演算された計測部発熱量演算値（ｑｍ）と、電池内部の電池熱容量（Ｃｉｎ）と、計測部の計測部熱容量（Ｃｍ）と、電池内部の電池熱抵抗（Ｒ１）と、計測部の熱抵抗（Ｒ２）との間の熱抵抗値（Ｒ１２）と、に基づいて、
所定時間後の電池内部温度推定値（Ｔ1 Ｋ）と、所定時間後の計測部温度推定値（Ｔ２ Ｋ）と、を演算するように構成されていることを特徴とする請求項１から３のいずれか１項に記載の二次電池の異常検出装置。 In the battery temperature estimation calculation unit,
The battery calorific value arithmetic value (q in ) calculated by the internal battery calorific value calculator, the calorific value calorific value (q m ) calculated by the measuring unit calorific value calculator, and the battery heat capacity inside the battery Thermal resistance value (R 12 ) between (C in ), measuring unit heat capacity (C m ) of measuring unit, battery thermal resistance (R 1 ) inside battery, and thermal resistance (R 2 ) of measuring unit And based on
Internal battery temperature estimation value after a predetermined time (T 1 K), measured part temperature estimation value after a predetermined time (T 2 K), claim 1, characterized in that it is configured to calculate the An abnormality detection device for a secondary battery according to any one of 3. 前記電池温度上昇異常判定制御部においては、
前記電池温度推定演算部で演算された計測部温度推定値（Ｔ２ Ｋ）に基づいて得られた計測部温度変化推定値（Ｔ3 Ｋ）と、前記二次電池の計測部で計測された実際の計測温度変化値（Ｔ4 Ｋ）を比較して、計測温度変化値（Ｔ4 Ｋ）≧計測部温度変化推定値（Ｔ3 Ｋ）であって、
前記計測温度変化値（Ｔ4 Ｋ）と計測部温度変化推定値（Ｔ3 Ｋ）との間の温度推定値差（Ｔ4 Ｋ−Ｔ3 Ｋ）が、所定の異常判定閾値を上回る場合に、前記二次電池の電池温度の温度上昇異常を判定するように構成されていることを特徴とする請求項４に記載の二次電池の異常検出装置。 In the battery temperature rise abnormality determination control unit,
A measured temperature change estimated value (T 3 K ) obtained based on the estimated measured temperature (T 2 K ) calculated by the battery temperature estimation calculation unit, and a measured value measured by the measurement unit of the secondary battery The actual measured temperature change value (T 4 K ) is compared, and the measured temperature change value (T 4 K ) 計 測 the measurement part temperature change estimated value (T 3 K ),
When the temperature estimated value difference (T 4 K −T 3 K ) between the measured temperature change value (T 4 K ) and the measurement part temperature change estimated value (T 3 K ) exceeds a predetermined abnormality determination threshold value 5. The secondary battery abnormality detection device according to claim 4, wherein the secondary battery abnormality detection device is configured to determine a temperature increase abnormality of a battery temperature of the secondary battery. 前記二次電池のＳＯＨが低いほど、前記所定の異常判定閾値が小さくなるように設定されていることを特徴とする請求項５に記載の二次電池の異常検出装置。   The secondary battery abnormality detection apparatus according to claim 5, wherein the predetermined abnormality determination threshold is set to be smaller as the SOH of the secondary battery is lower. 前記二次電池の計測部が、二次電池のセル端子に設けられていることを特徴とする請求項１から６のいずれか１項に記載の二次電池の異常検出装置。   The secondary battery abnormality detection device according to any one of claims 1 to 6, wherein a measurement unit of the secondary battery is provided at a cell terminal of the secondary battery. 請求項１から７のいずれか１項に記載の二次電池の異常検出装置を備えたことを特徴とする電動車両。   An electric vehicle comprising the secondary battery abnormality detection device according to any one of claims 1 to 7.
JP2017215682A 2017-11-08 2017-11-08 Abnormality detection device for secondary battery and electric vehicle provided with abnormality detection device Pending JP2019087457A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113745672A (en) * 2020-05-29 2021-12-03 比亚迪股份有限公司 Battery self-heating control method, battery self-heating device, system and vehicle
WO2023120187A1 (en) * 2021-12-24 2023-06-29 パナソニックＩｐマネジメント株式会社 Battery abnormality detecting system, battery abnormality detecting method, and battery abnormality detecting program
WO2023120282A1 (en) * 2021-12-24 2023-06-29 株式会社デンソー Battery monitoring device, battery transport apparatus, and battery monitoring method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113745672A (en) * 2020-05-29 2021-12-03 比亚迪股份有限公司 Battery self-heating control method, battery self-heating device, system and vehicle
WO2023120187A1 (en) * 2021-12-24 2023-06-29 パナソニックＩｐマネジメント株式会社 Battery abnormality detecting system, battery abnormality detecting method, and battery abnormality detecting program
WO2023120282A1 (en) * 2021-12-24 2023-06-29 株式会社デンソー Battery monitoring device, battery transport apparatus, and battery monitoring method

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