JP4383597B2 - Battery detection device and temperature detection method - Google Patents

Battery detection device and temperature detection method Download PDF

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Publication number
JP4383597B2
JP4383597B2 JP25819499A JP25819499A JP4383597B2 JP 4383597 B2 JP4383597 B2 JP 4383597B2 JP 25819499 A JP25819499 A JP 25819499A JP 25819499 A JP25819499 A JP 25819499A JP 4383597 B2 JP4383597 B2 JP 4383597B2
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temperature
battery
internal resistance
battery module
remaining capacity
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JP2001085071A (en
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究 乾
利明 中西
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Panasonic Corp
Toyota Motor Corp
Panasonic Holdings Corp
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Panasonic Corp
Toyota Motor Corp
Matsushita Electric Industrial Co Ltd
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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
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    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Description

【０００１】
【発明の属する技術分野】
本発明は、組電池の温度検出装置および温度検出方法に関し、詳しくは、少なくとも一つの電池を有する電池モジュールを複数直列または並列に接続してなる組電池の該複数の電池モジュールの各々の温度を検出する温度検出装置および温度検出方法に関する。
【０００２】
【従来の技術】
従来、この種の組電池の温度検出装置としては、電池の端子間の電圧と電池に流れる電流とに基づいて電池の温度を推定するものが提案されている（例えば、特開平１１−１６２５２６号公報など）。この装置では、電圧と電流とから電池の内部抵抗を演算し、演算した内部抵抗と電池の温度との関係から温度を推定している。なお、この装置では、電池の内部抵抗と電池の温度との関係は実験などにより予め求められており、演算された電池の内部抵抗に対応する温度を導出するものとしている。
【０００３】
【発明が解決しようとする課題】
しかしながら、こうした温度検出装置では、電池の温度が正確に検出できない場合がある。電池は使用態様によって劣化の程度や劣化以外の要因により電池の内部抵抗と電池の温度との関係がズレる場合がある。このように内部抵抗と温度との関係がズレたときには、電池の温度は内部抵抗から推定された温度と異なるものとなってしまう。
【０００４】
こうした問題に対して電池の温度を直接検出する手法もあるが、電池を複数接続してなる組電池の場合、電池の数だけの温度センサが必要になると共に制御コンピュータの回路規模も大きくなり、コストの増加を招いてしまう。
【０００５】
本発明の組電池の温度検出装置および温度検出方法は、各電池モジュールの温度をより正確に検出することを目的の一つとする。また、本発明の組電池の温度検出装置および温度検出方法は、簡易な構成で各電池モジュールの温度を検出することを目的の一つとする。
【０００６】
【課題を解決するための手段およびその作用・効果】
本発明の組電池の温度検出装置および温度検出方法は、上述の目的の少なくとも一部を達成するために以下の手段を採った。
【０００７】
本発明の組電池の温度検出装置は、
少なくとも一つの電池を有する電池モジュールを複数直列または並列に接続してなる組電池の該複数の電池モジュールの各々の温度を検出する温度検出装置であって、
前記複数の電池モジュールの各々の端子間の電圧を検出する電圧検出手段と、
前記複数の電池モジュールの各々に流れる電流を検出する電流検出手段と、
前記電圧検出手段により検出された各電圧と前記電流検出手段により検出された各電流から各電池モジュールの内部抵抗及び残存容量を求め、この内部抵抗及び残存容量に基づいて前記複数の電池モジュールの各々の温度を推定する温度推定手段と、
前記複数の電池モジュールのうち一部の電池モジュールの温度を検出する温度検出手段と、
前記検出された温度と該温度を検出した電池モジュールについて演算された残存容量とからこの電池モジュールの内部抵抗を導出し、この導出された内部抵抗とこの電池モジュールの前記演算された内部抵抗とから補正係数を計算し、この補正係数を各電池モジュールの内部抵抗に演算して各電池モジュールの内部抵抗を補正し、補正後の内部抵抗と残存容量とから各電池モジュールの温度を導出する補正手段と
を備えることを要旨とする。
【０００８】
この本発明の組電池の温度検出装置では、各電池モジュールの端子間の電圧と電流とに基づいて推定された温度を温度検出手段によって検出された温度に基づいて補正するから、電圧や電流から推定される温度が使用の態様などにより実際の温度と異なるものになっても、より正確な温度を検出値として得ることができる。
【０００９】
また、前記温度推定手段は、前記検出された各々の電圧と前記検出された各々の電流とに基づいて前記複数の電池モジュールの各々の内部抵抗を演算する第１内部抵抗演算手段と、前記検出された各々の電圧と前記検出された各々の電流とに基づいて前記複数の電池モジュールの各々の残存容量を演算する残存容量演算手段とを備え、前記第１内部抵抗演算手段により演算された各々の内部抵抗と前記残存容量演算手段により演算された各々の残存容量とに基づいて各電池モジュールの温度を推定する。
【００１０】
そして、前記補正手段は、前記温度検出手段により検出された温度に基づいて該温度を検出した電池モジュールの内部抵抗を演算する第２内部抵抗演算手段と、該演算された内部抵抗と前記第１内部抵抗演算手段により演算された対応する電池モジュールの内部抵抗とに基づいて補正値を設定する補正値設定手段とを備え、該設定された補正値を用いて前記第１内部抵抗演算手段により演算された各々の内部抵抗を補正することにより補正後の内部抵抗と残存容量とから各電池モジュールの温度を導出することができる。
本発明によれば、温度検出手段は少なくとも一つの電池モジュールに設置すればよいから、制御コンピュータの回路規模の増大を抑えることができると共にコストも低く抑えることができる。なお、「電池モジュール」には、複数の電池を直列または並列に接続してなるものを含むほか、単一の電池のみからなるものも含まれる。
【００１１】
本発明の組電池の温度検出方法は、
少なくとも一つの電池を有する電池モジュールを複数直列または並列に接続してなる組電池の該複数の電池モジュールの各々の温度を検出する温度検出方法であって、
前記複数の電池モジュールの各々の端子間の電圧と該複数の電池モジュールの各々に流れる電流から各電池モジュールの内部抵抗及び残存容量を求め、この内部抵抗及び残存容量に基づいて該複数の電池モジュールの各々の温度を推定し、
前記複数の電池モジュールのうち一部の電池モジュールの温度を検出し、
前記検出された温度と該温度を検出した電池モジュールについて演算された残存容量とからこの電池モジュールの内部抵抗を導出し、この導出された内部抵抗とこの電池モジュールの前記演算された内部抵抗とから補正係数を計算し、この補正係数を各電池モジュールの内部抵抗に演算して各電池モジュールの内部抵抗を補正し、補正後の内部抵抗と残存容量とから各電池モジュールの温度を導出する
ことを要旨とする。
【００１２】
この本発明の組電池の温度検出方法は、各電池モジュールの端子間の電圧と電流とに基づいて推定された温度を検出された温度に基づいて補正するから、電圧や電流から推定される温度が使用の態様などにより実際の温度と異なるものになっても、より正確な温度を検出値として得ることができる。しかも、温度を検出する電池モジュールは少なくとも一つあればよいから、制御コンピュータの回路規模の増大を抑えることができると共にコストも低く抑えることができる。なお、「電池モジュール」の用語については前述の本発明の組電池の温度検出装置と同様である。
【００１３】
【発明の実施の形態】
次に、本発明の実施の形態を実施例を用いて説明する。図１は、本発明の一実施例である組電池の温度検出装置２０の構成の概略を示す構成図である。実施例の組電池の温度検出装置２０は、図示するように、複数の電池モジュール１−ｎを直列または並列に接続してなる組電池２２と、組電池２２の各電池モジュール１−ｎの温度を検出する電池制御ユニット３０とを備える。
【００１４】
組電池２２を構成する複数の電池モジュール１−ｎは、充放電可能な少なくとも一つの二次電池を直列または並列に接続して構成されている。組電池２２の電池モジュール１には、その温度を検出する温度センサ２４が取り付けられており、その検出値は電池制御ユニット３０に入力されるようになっている。
【００１５】
電池制御ユニット３０は、組電池２２の各電池モジュール１〜ｎの端子間電圧Ｖ１−ｎを測定すると共に組電池２２に流れる電流Ｉを測定する各ブロック電圧・電流測定装置３２と、この各ブロック電圧・電流測定装置３２により測定された電圧Ｖ１−ｎと電流Ｉとにより各ブロック（各電池モジュール）の内部抵抗Ｒ１−ｎと残存容量ＳＯＣとを演算する各ブロック内部抵抗ＳＯＣ演算装置３４と、この各ブロック内部抵抗ＳＯＣ演算装置３４により演算された内部抵抗Ｒ１−ｎを温度センサ２４により検出された電池モジュール１の温度Ｔｓ１に基づいて必要に応じて補正すると共に補正前の内部抵抗Ｒ１−ｎや補正後の内部抵抗Ｒ１−ｎ’，残存容量ＳＯＣに基づいて各電池モジュール１〜ｎの温度Ｔ１−ｎを推定する電池温度推定演算装置３６とを備える。
【００１６】
各ブロック電圧・電流測定装置３２は、具体的には、組電池２２を流れる電流Ｉを検出する電流センサと、各電池モジュール１−ｎの出力端子に接続された複数の電圧センサとから構成されている。
【００１７】
各ブロック内部抵抗ＳＯＣ演算装置３４と電池温度推定演算装置３６は、具体的には、ハード構成としてはＣＰＵを中心として構成されたマイクロコンピュータにより構成されており、マイクロコンピュータが内部に備えるＲＯＭに予め記憶された処理プログラムとハード構成とが一体となって機能する。
【００１８】
次に、こうして構成された実施例の組電池の温度検出装置２０の動作について説明する。図２は、各ブロック内部抵抗ＳＯＣ演算装置３４や電池温度推定演算装置３６として機能するマイクロコンピュータにより実行される温度検出処理ルーチンの一例を示すフローチャートである。このルーチンは、所定時間毎（例えば、５分毎）に繰り返し実行される。
【００１９】
この温度検出処理ルーチンが実行されると、所定時間（例えば、２分）に亘って各ブロック電圧・電流測定装置３２により検出される各電池モジュール１−ｎの電圧Ｖ１−ｎと組電池２２に流れる電流Ｉとを読み込む処理を実行する（ステップＳ１００）。そして、読み込んだ電圧Ｖ１−ｎと電流Ｉとに基づいて各電池モジュール１−ｎの内部抵抗Ｒ１−ｎを演算する処理を行なう（ステップＳ１０２）。内部抵抗Ｒ１−ｎは、所定時間に亘って検出した電圧Ｖ１−ｎと電流Ｉとから電圧電流特性を直線近似し、その傾きを求めることにより演算することができる。所定時間に亘って検出した電池モジュールの電圧Ｖと電流Ｉとにより電池モジュールの内部抵抗Ｒを求める様子の一例を図３に示す。
【００２０】
次に、残存容量ＳＯＣを読み込む処理を実行する（ステップＳ１０４）。実施例では、所定時間毎に繰り返し実行される図示しないルーチンにより、組電池２２を流れる電流Ｉを積算することにより残存容量ＳＯＣを演算し、その値をマイクロコンピュータのＲＡＭの所定アドレスに書き込むものとしたから、ＲＡＭの所定アドレスをアクセスすることにより残存容量ＳＯＣを読み込む処理を行なうことができる。そして、残存容量ＳＯＣと内部抵抗Ｒ１−ｎとから各電池モジュール１−ｎの温度Ｔ１−ｎを導出する処理を実行する（ステップＳ１０６）。この処理は、電池モジュールの内部抵抗と残存容量ＳＯＣと温度との関係を実験などにより求めて特性マップとしてマイクロコンピュータが内部に備えるＲＯＭに予め記憶しておき、残存容量ＳＯＣと内部抵抗Ｒ１−ｎをこの特性マップに適用して電池モジュール１−ｎの温度Ｔ１−ｎを導出することにより行なうことができる。この特性マップの一例を用いて電池温度を求める様子の一例を図４に示す。図４では、まず残存容量ＳＯＣの値から適用する特性マップを決定し、決定した特性マップに対して内部抵抗を与えることにより電池温度を得ている。
【００２１】
次に、温度センサ２４により検出される電池モジュール１の温度Ｔｓ１を読み込む処理を行ない（ステップＳ１０８）、読み込んだ温度Ｔｓ１と導出した電池モジュール１の温度Ｔ１とを比較する処理を行なう（ステップＳ１１０）。検出された温度Ｔｓ１が導出された温度Ｔ１に等しいときには、電池は劣化していないと判断し、ステップＳ１０６で導出した電池モジュール１−ｎの温度Ｔ１−ｎを検出値として本ルーチンを終了する。
【００２２】
一方、検出した温度Ｔｓ１と導出した温度Ｔ１とが等しくないときには、電池に劣化が生じていると判定し、検出した温度Ｔｓ１と残存容量ＳＯＣとを前述の特性マップに適用して電池モジュール１の内部抵抗Ｒ１’を導出する処理を行なう（ステップＳ１１２）。続いて、導出した内部抵抗Ｒ１’をステップＳ１０２で演算した内部抵抗Ｒ１で割って補正係数ｋを計算する処理を行なう（ステップＳ１１４）。補正係数ｋを計算する様子を図５に例示する。こうした補正係数ｋを計算すると、計算した補正係数ｋをステップＳ１０２で演算した各内部抵抗Ｒ１−ｎに乗じて内部抵抗を補正する処理を行なう（ステップＳ１１６）。そして、補正後の内部抵抗Ｒ１−ｎ’と残存容量ＳＯＣとを特性マップ（図４参照）に適用して各電池モジュール１−ｎの温度Ｔ１−ｎを導出する処理を行ない（ステップＳ１１８）、この導出した温度Ｔ１−ｎを検出値として本ルーチンを終了する。
【００２３】
以上説明した実施例の組電池の温度検出装置２０によれば、検出した電圧Ｖ１−ｎと電流Ｉとに基づいて演算される内部抵抗Ｒ１−ｎに基づいて各電池モジュール１−ｎの温度Ｔ１−ｎを求めることができる。しかも、電池モジュール１の温度を温度センサ２４により検出し、検出した温度Ｔｓ１と導出した温度Ｔ１とから電池の劣化を判断し、電池が劣化しているときには、検出した温度Ｔｓ１に基づいて劣化を補正して各電池モジュール１−ｎの温度Ｔ１−ｎを求めることができる。この結果、より正確に各電池モジュール１−ｎの温度Ｔ１−ｎを検出することができる。
【００２４】
また、実施例の組電池の温度検出装置２０によれば、電池モジュール１にだけ温度センサ２４を取り付けるものとしたから、各電池モジュール１−ｎに温度センサを取り付ける構成に比して、簡易な構成とすることができ、温度を検出するためのコストを抑制することができる。
【００２５】
実施例の組電池の温度検出装置２０では、残存容量ＳＯＣは別のルーチンにより演算するものとしたが、同一のルーチンにより演算するものとしてもよい。
【００２６】
以上、本発明の実施の形態について実施例を用いて説明したが、本発明はこうした実施例に何等限定されるものではなく、本発明の要旨を逸脱しない範囲内において、種々なる形態で実施し得ることは勿論である。
【図面の簡単な説明】
【図１】 本発明の一実施例である組電池の温度検出装置２０の構成の概略を示す構成図である。
【図２】 各ブロック内部抵抗ＳＯＣ演算装置３４や電池温度推定演算装置３６として機能するマイクロコンピュータにより実行される温度検出処理ルーチンの一例を示すフローチャートである。
【図３】 所定時間に亘って検出した電池モジュールの電圧Ｖと電流Ｉとにより電池モジュールの内部抵抗Ｒを求める様子の一例を示す説明図である。
【図４】 電池モジュールの内部抵抗と残存容量ＳＯＣと温度との関係の一例を示す特性マップを用いて温度を導出する様子を示す説明図である。
【図５】 補正係数ｋを計算する様子の一例を示す説明図である。
【符号の説明】
２０ 組電池の温度検出装置、２２ 組電池、２４ 温度センサ、３０ 電池制御ユニット、３２ 各ブロック電圧・電流測定装置、３４ 各ブロック内部抵抗ＳＯＣ演算装置、３６ 電池温度推定演算装置。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a temperature detection apparatus and a temperature detection method for an assembled battery, and more specifically, to determine the temperature of each of the plurality of battery modules of an assembled battery formed by connecting a plurality of battery modules having at least one battery in series or in parallel. The present invention relates to a temperature detecting device and a temperature detecting method.
[0002]
[Prior art]
Conventionally, as this type of assembled battery temperature detection device, an apparatus that estimates the temperature of a battery based on the voltage between the terminals of the battery and the current flowing through the battery has been proposed (for example, Japanese Patent Application Laid-Open No. 11-162526). Gazette). In this device, the internal resistance of the battery is calculated from the voltage and current, and the temperature is estimated from the relationship between the calculated internal resistance and the temperature of the battery. In this apparatus, the relationship between the internal resistance of the battery and the temperature of the battery is obtained in advance by experiments or the like, and the temperature corresponding to the calculated internal resistance of the battery is derived.
[0003]
[Problems to be solved by the invention]
However, such a temperature detection device may not be able to accurately detect the temperature of the battery. Depending on the mode of use, the relationship between the internal resistance of the battery and the battery temperature may deviate depending on the degree of deterioration and factors other than the deterioration. When the relationship between the internal resistance and temperature deviates as described above, the battery temperature is different from the temperature estimated from the internal resistance.
[0004]
Although there is a method for directly detecting the temperature of the battery for such a problem, in the case of an assembled battery in which a plurality of batteries are connected, a temperature sensor corresponding to the number of batteries is required and the circuit scale of the control computer is increased. This will increase the cost.
[0005]
An object of the temperature detection apparatus and temperature detection method for an assembled battery of the present invention is to more accurately detect the temperature of each battery module. Another object of the temperature detection apparatus and temperature detection method for an assembled battery of the present invention is to detect the temperature of each battery module with a simple configuration.
[0006]
[Means for solving the problems and their functions and effects]
The assembled battery temperature detection apparatus and temperature detection method of the present invention employ the following means in order to achieve at least a part of the above-described object.
[0007]
The assembled battery temperature detection device of the present invention is
A temperature detection device for detecting the temperature of each of a plurality of battery modules of an assembled battery formed by connecting a plurality of battery modules having at least one battery in series or in parallel,
Voltage detecting means for detecting a voltage between terminals of each of the plurality of battery modules;
Current detection means for detecting current flowing in each of the plurality of battery modules;
An internal resistance and a remaining capacity of each battery module are obtained from each voltage detected by the voltage detecting means and each current detected by the current detecting means, and each of the plurality of battery modules is based on the internal resistance and the remaining capacity. Temperature estimation means for estimating the temperature of
Temperature detecting means for detecting the temperature of some of the battery modules ;
Derives the internal resistance of the battery module from the remaining capacity computed for battery module detects said detected temperature and the temperature, from this derived internal resistance and the computed internal resistance of the battery module Correction means that calculates a correction coefficient, calculates the correction coefficient to the internal resistance of each battery module to correct the internal resistance of each battery module, and derives the temperature of each battery module from the corrected internal resistance and the remaining capacity The gist is to provide and.
[0008]
In the assembled battery temperature detecting device of the present invention, the temperature estimated based on the voltage and current between the terminals of each battery module is corrected based on the temperature detected by the temperature detecting means, so temperature estimated even become different from the actual temperature due mode of use, it is possible to obtain a more accurate temperature as a detected value.
[0009]
Further , the temperature estimation means includes first internal resistance calculation means for calculating an internal resistance of each of the plurality of battery modules based on the detected voltages and the detected currents, and the detection Each of the plurality of battery modules based on the detected voltage and the detected current, and a remaining capacity calculating means for calculating the remaining capacity of each of the plurality of battery modules. based in on the remaining capacity of each calculated by the internal resistance and the remaining capacity calculating unit that to estimate the temperature of each battery module.
[0010]
The correction means includes second internal resistance calculation means for calculating the internal resistance of the battery module that has detected the temperature based on the temperature detected by the temperature detection means, the calculated internal resistance, and the first Correction value setting means for setting a correction value based on the internal resistance of the corresponding battery module calculated by the internal resistance calculation means, and calculating by the first internal resistance calculation means using the set correction value By correcting the respective internal resistances, the temperature of each battery module can be derived from the corrected internal resistance and the remaining capacity.
According to the present invention, since the temperature detection means may be installed in at least one battery module, it is possible to suppress an increase in the circuit scale of the control computer and to reduce the cost. The “battery module” includes not only a battery formed by connecting a plurality of batteries in series or in parallel, but also a battery consisting of only a single battery.
[0011]
The battery assembly temperature detection method of the present invention includes:
A temperature detection method for detecting the temperature of each of a plurality of battery modules of an assembled battery formed by connecting a plurality of battery modules having at least one battery in series or in parallel,
An internal resistance and a remaining capacity of each battery module are obtained from a voltage between terminals of each of the plurality of battery modules and a current flowing through each of the plurality of battery modules, and the plurality of battery modules are obtained based on the internal resistance and the remaining capacity. Estimate the temperature of each
Detecting the temperature of some of the plurality of battery modules;
Derives the internal resistance of the battery module from the remaining capacity computed for battery module detects said detected temperature and the temperature, from this derived internal resistance and the computed internal resistance of the battery module Calculate the correction coefficient, calculate the correction coefficient to the internal resistance of each battery module to correct the internal resistance of each battery module , and derive the temperature of each battery module from the corrected internal resistance and remaining capacity. The gist.
[0012]
Since the temperature detection method for the assembled battery of the present invention corrects the temperature estimated based on the voltage and current between the terminals of each battery module based on the detected temperature, the temperature estimated from the voltage and current Even if the temperature differs from the actual temperature depending on the mode of use or the like, a more accurate temperature can be obtained as the detected value. In addition, since at least one battery module for detecting the temperature is sufficient, an increase in the circuit scale of the control computer can be suppressed and the cost can be reduced. The term “battery module” is the same as that of the temperature detection device for a battery pack of the present invention described above.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described using examples. FIG. 1 is a configuration diagram showing an outline of a configuration of a temperature detection device 20 for an assembled battery according to an embodiment of the present invention. As shown in the figure, the battery pack temperature detection device 20 of the embodiment includes a battery pack 22 formed by connecting a plurality of battery modules 1-n in series or in parallel, and the temperature of each battery module 1-n of the battery pack 22. And a battery control unit 30 for detecting.
[0014]
The plurality of battery modules 1-n configuring the assembled battery 22 are configured by connecting at least one chargeable / dischargeable secondary battery in series or in parallel. A temperature sensor 24 for detecting the temperature is attached to the battery module 1 of the assembled battery 22, and the detected value is input to the battery control unit 30.
[0015]
The battery control unit 30 measures the voltage V1-n between the terminals of the battery modules 1 to n of the assembled battery 22 and measures the current I flowing through the assembled battery 22, and the block voltage / current measuring device 32 and the blocks. Each block internal resistance SOC calculating device 34 for calculating the internal resistance R1-n and the remaining capacity SOC of each block (each battery module) from the voltage V1-n and current I measured by the voltage / current measuring device 32; The internal resistance R1-n calculated by each block internal resistance SOC calculation device 34 is corrected as necessary based on the temperature Ts1 of the battery module 1 detected by the temperature sensor 24, and the internal resistance R1-n before correction is corrected. Battery temperature estimation calculation for estimating the temperature T1-n of each battery module 1 to n based on the corrected internal resistance R1-n ′ and the remaining capacity SOC Device 36.
[0016]
Specifically, each block voltage / current measuring device 32 includes a current sensor that detects the current I flowing through the assembled battery 22 and a plurality of voltage sensors connected to the output terminals of each battery module 1-n. ing.
[0017]
Specifically, each block internal resistance SOC calculation device 34 and battery temperature estimation calculation device 36 are configured by a microcomputer mainly composed of a CPU as a hardware configuration, and are stored in advance in a ROM included in the microcomputer. The stored processing program and hardware configuration function together.
[0018]
Next, the operation of the temperature detection device 20 for the assembled battery of the embodiment thus configured will be described. FIG. 2 is a flowchart showing an example of a temperature detection processing routine executed by a microcomputer functioning as each block internal resistance SOC calculation device 34 or battery temperature estimation calculation device 36. This routine is repeatedly executed every predetermined time (for example, every 5 minutes).
[0019]
When this temperature detection processing routine is executed, the voltage V1-n of each battery module 1-n detected by each block voltage / current measuring device 32 and the assembled battery 22 are detected over a predetermined time (for example, 2 minutes). A process of reading the flowing current I is executed (step S100). Then, a process of calculating the internal resistance R1-n of each battery module 1-n based on the read voltage V1-n and current I is performed (step S102). The internal resistance R1-n can be calculated by linearly approximating the voltage-current characteristic from the voltage V1-n and the current I detected over a predetermined time and obtaining the slope thereof. An example of how the internal resistance R of the battery module is obtained from the voltage V and current I of the battery module detected over a predetermined time is shown in FIG.
[0020]
Next, a process for reading the remaining capacity SOC is executed (step S104). In the embodiment, the remaining capacity SOC is calculated by integrating the current I flowing through the assembled battery 22 by a routine (not shown) that is repeatedly executed every predetermined time, and the value is written in a predetermined address of the RAM of the microcomputer. Therefore, the remaining capacity SOC can be read by accessing a predetermined address in the RAM. Then, a process of deriving the temperature T1-n of each battery module 1-n from the remaining capacity SOC and the internal resistance R1-n is executed (step S106). In this process, the relationship between the internal resistance of the battery module, the remaining capacity SOC, and the temperature is obtained by experiments and stored in advance in a ROM included in the microcomputer as a characteristic map, and the remaining capacity SOC and the internal resistance R1-n. Is applied to this characteristic map to derive the temperature T1-n of the battery module 1-n. An example of how the battery temperature is obtained using an example of this characteristic map is shown in FIG. In FIG. 4, first, a characteristic map to be applied is determined from the value of the remaining capacity SOC, and the battery temperature is obtained by giving an internal resistance to the determined characteristic map.
[0021]
Next, a process of reading the temperature Ts1 of the battery module 1 detected by the temperature sensor 24 is performed (step S108), and a process of comparing the read temperature Ts1 with the derived temperature T1 of the battery module 1 is performed (step S110). . When the detected temperature Ts1 is equal to the derived temperature T1, it is determined that the battery has not deteriorated, and the routine ends with the temperature T1-n of the battery module 1-n derived in step S106 as the detected value.
[0022]
On the other hand, when the detected temperature Ts1 and the derived temperature T1 are not equal, it is determined that the battery has deteriorated, and the detected temperature Ts1 and the remaining capacity SOC are applied to the aforementioned characteristic map to Processing for deriving the internal resistance R1 ′ is performed (step S112). Subsequently, a process of calculating the correction coefficient k by dividing the derived internal resistance R1 ′ by the internal resistance R1 calculated in step S102 is performed (step S114). FIG. 5 illustrates how the correction coefficient k is calculated. When such a correction coefficient k is calculated, a process of correcting the internal resistance by multiplying the calculated correction coefficient k by each internal resistance R1-n calculated in step S102 is performed (step S116). Then, a process for deriving the temperature T1-n of each battery module 1-n by applying the corrected internal resistance R1-n ′ and the remaining capacity SOC to the characteristic map (see FIG. 4) is performed (step S118). This derived temperature T1-n is used as a detected value, and this routine is terminated.
[0023]
According to the assembled battery temperature detection device 20 of the embodiment described above, the temperature T1 of each battery module 1-n based on the internal resistance R1-n calculated based on the detected voltage V1-n and the current I. -N can be obtained. In addition, the temperature of the battery module 1 is detected by the temperature sensor 24, and the deterioration of the battery is determined from the detected temperature Ts1 and the derived temperature T1, and when the battery is deteriorated, the deterioration is determined based on the detected temperature Ts1. It can correct | amend and can obtain | require temperature T1-n of each battery module 1-n. As a result, the temperature T1-n of each battery module 1-n can be detected more accurately.
[0024]
Moreover, according to the temperature detection apparatus 20 of the assembled battery of the embodiment, the temperature sensor 24 is attached only to the battery module 1, so that it is simpler than the configuration in which the temperature sensor is attached to each battery module 1-n. It can be set as a structure and the cost for detecting temperature can be suppressed.
[0025]
In the assembled battery temperature detection device 20 of the embodiment, the remaining capacity SOC is calculated by another routine, but may be calculated by the same routine.
[0026]
The embodiments of the present invention have been described using the embodiments. However, the present invention is not limited to these embodiments, and can be implemented in various forms without departing from the gist of the present invention. Of course you get.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing an outline of the configuration of an assembled battery temperature detection device 20 according to an embodiment of the present invention.
FIG. 2 is a flowchart showing an example of a temperature detection processing routine executed by a microcomputer functioning as each block internal resistance SOC calculation device 34 and battery temperature estimation calculation device 36;
FIG. 3 is an explanatory diagram showing an example of how the internal resistance R of a battery module is obtained from the voltage V and current I of the battery module detected over a predetermined time.
FIG. 4 is an explanatory diagram showing how the temperature is derived using a characteristic map showing an example of the relationship between the internal resistance of the battery module, the remaining capacity SOC, and the temperature.
FIG. 5 is an explanatory diagram showing an example of how a correction coefficient k is calculated.
[Explanation of symbols]
20 battery assembly temperature detection device, 22 battery assembly, 24 temperature sensor, 30 battery control unit, 32 each block voltage / current measurement device, 34 each block internal resistance SOC computation device, 36 battery temperature estimation computation device.

Claims (2)

少なくとも一つの電池を有する電池モジュールを複数直列または並列に接続してなる組電池の該複数の電池モジュールの各々の温度を検出する温度検出装置であって、
前記複数の電池モジュールの各々の端子間の電圧を検出する電圧検出手段と、
前記複数の電池モジュールの各々に流れる電流を検出する電流検出手段と、
前記電圧検出手段により検出された各電圧と前記電流検出手段により検出された各電流から各電池モジュールの内部抵抗及び残存容量を求め、この内部抵抗及び残存容量に基づいて前記複数の電池モジュールの各々の温度を推定する温度推定手段と、
前記複数の電池モジュールのうち一部の電池モジュールの温度を検出する温度検出手段と、
前記検出された温度と該温度を検出した電池モジュールについて演算された残存容量とからこの電池モジュールの内部抵抗を導出し、この導出された内部抵抗とこの電池モジュールの前記演算された内部抵抗とから補正係数を計算し、この補正係数を各電池モジュールの内部抵抗に演算して各電池モジュールの内部抵抗を補正し、補正後の内部抵抗と残存容量とから各電池モジュールの温度を導出する補正手段と、
を備えた
温度検出装置。A temperature detection device for detecting the temperature of each of a plurality of battery modules of an assembled battery formed by connecting a plurality of battery modules having at least one battery in series or in parallel,
Voltage detecting means for detecting a voltage between terminals of each of the plurality of battery modules;
Current detection means for detecting current flowing in each of the plurality of battery modules;
An internal resistance and a remaining capacity of each battery module are obtained from each voltage detected by the voltage detecting means and each current detected by the current detecting means, and each of the plurality of battery modules is based on the internal resistance and the remaining capacity. Temperature estimation means for estimating the temperature of
Temperature detecting means for detecting the temperature of some of the battery modules ;
Derives the internal resistance of the battery module from the remaining capacity computed for battery module detects said detected temperature and the temperature, from this derived internal resistance and the computed internal resistance of the battery module Correction means that calculates a correction coefficient, calculates the correction coefficient to the internal resistance of each battery module to correct the internal resistance of each battery module, and derives the temperature of each battery module from the corrected internal resistance and the remaining capacity When,
Temperature detection device example Bei the. 少なくとも一つの電池を有する電池モジュールを複数直列または並列に接続してなる組電池の該複数の電池モジュールの各々の温度を検出する温度検出方法であって、A temperature detection method for detecting the temperature of each of a plurality of battery modules of an assembled battery formed by connecting a plurality of battery modules having at least one battery in series or in parallel,
前記複数の電池モジュールの各々の端子間の電圧と該複数の電池モジュールの各々に流れる電流から各電池モジュールの内部抵抗及び残存容量を求め、この内部抵抗及び残存容量に基づいて該複数の電池モジュールの各々の温度を推定し、An internal resistance and a remaining capacity of each battery module are obtained from a voltage between terminals of each of the plurality of battery modules and a current flowing through each of the plurality of battery modules, and the plurality of battery modules are obtained based on the internal resistance and the remaining capacity. Estimate the temperature of each
前記複数の電池モジュールのうち一部の電池モジュールの温度を検出し、Detecting the temperature of some of the plurality of battery modules;
前記検出された温度と該温度を検出した電池モジュールについて演算された残存容量とからこの電池モジュールの内部抵抗を導出し、この導出された内部抵抗とこの電池モジュールの前記演算された内部抵抗とから補正係数を計算し、この補正係数を各電池モジュールの内部抵抗に演算して各電池モジュールの内部抵抗を補正し、補正後の内部抵抗と残存容量とから各電池モジュールの温度を導出するThe internal resistance of the battery module is derived from the detected temperature and the remaining capacity calculated for the battery module that detected the temperature, and the internal resistance of the battery module and the calculated internal resistance of the battery module are derived. The correction coefficient is calculated, the correction coefficient is calculated for the internal resistance of each battery module to correct the internal resistance of each battery module, and the temperature of each battery module is derived from the corrected internal resistance and the remaining capacity.
温度検出方法。Temperature detection method.
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