JP4788641B2 - Degradation state detection method for storage battery - Google Patents
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Description
本発明は、蓄電池の劣化状態検出に関するものである。 The present invention relates to detection of a deterioration state of a storage battery.
従来の技術では蓄電池の劣化状態と直流状態での内部抵抗（以下、ＤＣＩＲ）の相関が密接であることから、ＤＣＩＲを蓄電池の劣化状態の指標として用いてきた。このＤＣＩＲの測定方法としては、例えば、車両用の蓄電池においては車両走行中の、蓄電池の負荷電流Ｉと、そのときの蓄電池電圧Ｖを測定し、Ｉ−Ｖ特性の履歴データを線形近似して、その傾きをＤＣＩＲとして用いてきた（例えば特許文献１参照）。
しかしながら、上記従来の方法では、測定する電流領域によってＤＣＩＲ値の精度が左右され、その結果、高精度のＤＣＩＲ値検出が困難であり、蓄電池の劣化状態検出精度が低下していた。 However, in the above conventional method, the accuracy of the DCIR value depends on the current region to be measured. As a result, it is difficult to detect the DCIR value with high accuracy, and the accuracy of detecting the deterioration state of the storage battery is lowered.
本発明は上記従来の課題を解決しようとするもので、蓄電池に流れる負荷電流より蓄電池のＤＣＩＲを検出し、このＤＣＩＲより蓄電池の劣化状態を検出する蓄電池の劣化状態検出方法であり、負荷電流が高負荷電流域内である時点で蓄電池のＤＣＩＲを検出してＤＣＩＲ１とし、負荷電流が低負荷電流域内である時点で蓄電池のＤＣＩＲを検出してＤＣＩＲ２とし、ＤＣＩＲ１を検出した際には、このＤＣＩＲ１を蓄電池のＤＣＩＲとし、前記ＤＣＩＲ１検出後、所定時間内にＤＣＩＲ１を検出しない場合にＤＣＩＲ２を蓄電池のＤＣＩＲとすることを特徴とする蓄電池の劣化状態検出方法を示すものである。 The present invention is intended to solve the above-described conventional problems, and is a storage battery deterioration state detection method for detecting a DCIR of a storage battery from a load current flowing through the storage battery, and detecting a deterioration state of the storage battery from the DCIR. The DCIR of the storage battery is detected as DCIR1 when it is within the high load current range, and the DCIR of the storage battery is detected as DCIR2 when the load current is within the low load current range. When DCIR1 is detected, this DCIR1 is A storage battery deterioration state detection method is characterized in that DCIR of a storage battery is used, and when DCIR1 is not detected within a predetermined time after DCIR1 is detected, DCIR2 is used as the DCIR of the storage battery.
なお、負荷電流が放電側で単調推移した際にＤＣＩＲ１及びＤＣＩＲ２を検出することにより、充電時のガス発生による影響を省き、より高精度のＤＣＩＲの算出を行うことができ、好ましい。 Note that it is preferable that DCIR1 and DCIR2 are detected when the load current monotonously changes on the discharge side, so that the influence of gas generation at the time of charging can be omitted and DCIR can be calculated with higher accuracy.
本発明によれば、劣化状態検出のパラメータであるＤＣＩＲの検出精度が顕著に向上するため、結果として、蓄電池の劣化状態を精度よく検出できるという顕著な効果を奏する。 According to the present invention, since the detection accuracy of DCIR, which is a parameter for detecting the deterioration state, is significantly improved, as a result, the deterioration state of the storage battery can be detected with high accuracy.
本発明の蓄電池の劣化状態検出方法は、蓄電池に流れる負荷電流より蓄電池のＤＣＩＲを検出し、このＤＣＩＲより蓄電池の劣化状態を検出する。 The storage battery deterioration state detection method of the present invention detects the DCIR of the storage battery from the load current flowing through the storage battery, and detects the deterioration state of the storage battery from this DCIR.
負荷電流からの蓄電池のＤＣＩＲの検出方法として、蓄電池の負荷電流Ｉとそのときの蓄電池電圧Ｖを所定時間間隔で、最低２点計測し、図１に示すようなＩ―Ｖ特性において、計測された２点間を直線で結び、その直線の傾きをＤＣＩＲとして算出することができる。 As a method for detecting the DCIR of the storage battery from the load current, the load current I of the storage battery and the storage battery voltage V at that time are measured at a minimum of two points at predetermined time intervals, and measured with the IV characteristics as shown in FIG. The two points can be connected with a straight line, and the slope of the straight line can be calculated as DCIR.
また、検出ポイントを２点とするのではなく、３点以上とすることもＤＣＩＲの測定精度向上の面で好ましい。３点以上の複数点よりＤＣＩＲを検出する場合は最小二乗法によりＩ−Ｖ間の近似直線を求め、その傾きをＤＣＩＲとすればよい。また、負荷電流Ｉが、放電側で単調推移している間にＤＣＩＲを検出することにより、充電時に発生するガスの影響や、電流変化に伴う電圧変化の遅れの影響を低減することができ、より高精度にＤＣＩＲを検出できるため、好ましい。 In addition, it is preferable from the viewpoint of improving DCIR measurement accuracy that the number of detection points is not two but three or more. When DCIR is detected from a plurality of three or more points, an approximate straight line between I and V is obtained by the least square method, and the slope thereof is DCIR. Further, by detecting DCIR while the load current I is monotonously changing on the discharge side, it is possible to reduce the influence of gas generated during charging and the influence of delay in voltage change caused by current change, This is preferable because DCIR can be detected with higher accuracy.
図２は、本発明の蓄電池の劣化状態検出方法を適用する蓄電池の放電負荷特性の一例を示す図である。なお、図２に示した例は、蓄電池を電動車に搭載した場合の例を示している。放電負荷電流Ｉは、車両の走行や停止その他の運行状況によって急激に変化する。本発明では、負荷電流が高負荷電流域（図２に示す領域１）内である時点で蓄電池のＤＣＩＲを検出してＤＣＩＲ１とする。 FIG. 2 is a diagram illustrating an example of a discharge load characteristic of a storage battery to which the storage battery deterioration state detection method of the present invention is applied. In addition, the example shown in FIG. 2 has shown the example at the time of mounting a storage battery in an electric vehicle. The discharge load current I changes abruptly depending on the running, stopping and other operating conditions of the vehicle. In the present invention, when the load current is within the high load current region (region 1 shown in FIG. 2), the DCIR of the storage battery is detected and set to DCIR1.
また、負荷電流が低負荷電流域内（図２に示す領域２）である時点で蓄電池のＤＣＩＲを検出してＤＣＩＲ２とする。 Further, when the load current is within the low load current region (region 2 shown in FIG. 2), the DCIR of the storage battery is detected and set to DCIR2.
図３は、負荷電流ＩとＤＣＩＲとの関係の一例を示す図である。図３から、負荷電流Ｉの差分ΔＩと、ＤＣＩＲの差分ΔＤＣＩＲの比（ΔＤＣＩＲ／ΔＩ）は、負荷電流が高い領域で、負荷電流が低い領域よりも大幅に低下することがわかる。すなわち、負荷電流が高い領域では、低い領域に比較して、負荷電流の変化がＤＣＩＲの変化に及ぼす影響はより小さい。したがって、高い負荷電流で計測したＤＣＩＲ１は、低い負荷電流で計測したＤＣＩＲ２に比較して、蓄電池のＤＣＩＲとして、より精度の高い値であることがわかる。 FIG. 3 is a diagram illustrating an example of the relationship between the load current I and DCIR. From FIG. 3, it can be seen that the ratio (ΔDCIR / ΔI) of the difference ΔI of the load current I and the difference ΔDCIR of the DCIR is significantly lower in the region where the load current is high than in the region where the load current is low. That is, in the region where the load current is high, the influence of the change in the load current on the change in DCIR is smaller than in the region where the load current is low. Therefore, it can be seen that DCIR1 measured with a high load current is a more accurate value as the DCIR of the storage battery than DCIR2 measured with a low load current.
しかしながら、図２に示したように、負荷電流が高負荷電流領域内にある確率は、低負荷電流領域内にある確率よりも極めて低く、ＤＣＩＲ１を常時得ることはできない。 However, as shown in FIG. 2, the probability that the load current is in the high load current region is much lower than the probability that the load current is in the low load current region, and DCIR1 cannot always be obtained.
したがって、本発明では、図４に示したようなフローによってＤＣＩＲの検出を行う。図２に示した負荷電流推移において、常時蓄電池の負荷電流Ｉと電圧Ｖを測定し（Ｓ１）、低負荷電流領域にてＤＣＩＲが検出できた場合（図２におけるポイントＡ及びＢ、図４におけるＳ２）には、これをＤＣＩＲ２として記憶し（Ｓ３）、高負荷電流領域にてＤＣＩＲが検出できた場合（図２におけるポイントＣ、図４におけるＳ４）には、これをＤＣＩＲ１として記憶する（Ｓ５）。 Therefore, in the present invention, DCIR is detected by the flow shown in FIG. In the load current transition shown in FIG. 2, when the load current I and voltage V of the constant storage battery are measured (S1) and DCIR can be detected in the low load current region (points A and B in FIG. 2, and in FIG. 4) In S2), this is stored as DCIR2 (S3), and when DCIR can be detected in the high load current region (point C in FIG. 2, S4 in FIG. 4), this is stored as DCIR1 (S5). ).
ＤＣＩＲ１（図２におけるポイントＣ）が得られたときには、常にＤＣＩＲ１をＤＣＩＲとして採用するが（Ｓ７）、ＤＣＩＲ１を検出後、ＤＣＩＲ１が得られないまま所定時間Ｔを経過した場合、ＤＣＩＲ１の精度は低下していると考えられ、より直近に検出されたＤＣＩＲ２（図２に示すポイントＤ）をＤＣＩＲとして採用する（Ｓ８）ことで、蓄電池のＤＣＩＲの精度を一定水準以上に保つ事ができる。 When DCIR1 (point C in FIG. 2) is obtained, DCIR1 is always adopted as DCIR (S7). However, if DCIR1 is not obtained after DCIR1 is detected, the accuracy of DCIR1 decreases. By adopting DCIR2 (point D shown in FIG. 2) detected most recently as DCIR (S8), the accuracy of the DCIR of the storage battery can be maintained at a certain level or higher.
なお、ＤＣＩＲ１に替えて直近に得られたＤＣＩＲ２値を採用する前記の所定時間Ｔは、負荷電流の時間的推移と、劣化の進行度合いに応じて設定すべきである。例えば、劣化が早期に進行する場合は、所定時間Ｔを短く、例えば１時間〜２４時間といったスパンとし、劣化が早期に進行せず、緩慢に進行する場合には、所定時間Ｔを長く、例えば２４０時間以上に設定することができる。なお、所定時間Ｔを越えた後に、ＤＣＩＲ１が検出された場合（図２に示すポイントＥ），ただちにこのＤＣＩＲ１を蓄電池のＤＣＩＲとして採用する。 The predetermined time T in which the most recently obtained DCIR2 value is used instead of DCIR1 should be set according to the time transition of the load current and the degree of progress of deterioration. For example, when the deterioration progresses early, the predetermined time T is shortened, for example, a span of 1 to 24 hours, and when the deterioration does not progress early but progresses slowly, the predetermined time T is increased. It can be set to 240 hours or more. In addition, when DCIR1 is detected after exceeding the predetermined time T (point E shown in FIG. 2), this DCIR1 is immediately adopted as the DCIR of the storage battery.
高負荷電流領域と低負荷電流領域の設定方法は、あらかじめ、車両等の使用機器のすべての使用モードにおける負荷電流推移を計測しておき、その負荷電流の範囲に応じて設定すればよい。高負荷電流域は前記使用機器の使用モードにおける最大電流値に近い範囲に設定するほうがよい。また、低負荷電流域は、使用頻度が多く、かつ、なるべく最大電流値に近い領域を設定するほうがよい。その際、高負荷電流域と低負荷電流域は重複してはならない。 As a method for setting the high load current region and the low load current region, the load current transition in all the use modes of the use device such as the vehicle is measured in advance, and may be set according to the range of the load current. It is better to set the high load current region in a range close to the maximum current value in the use mode of the device used. Further, it is better to set the low load current region as frequently used and as close to the maximum current value as possible. At that time, the high load current region and the low load current region should not overlap.
例えば、図２に示した電流推移において、最大負荷電流が１８０Ａの場合、高負荷電流領域を１２０Ａ〜１８０Ａ、低負荷電流領域を２０Ａ〜６０Ａと設定することができる。 For example, in the current transition shown in FIG. 2, when the maximum load current is 180 A, the high load current region can be set to 120 A to 180 A, and the low load current region can be set to 20 A to 60 A.
前記して得られた蓄電池のＤＣＩＲから、蓄電池の劣化状態を検出する（Ｓ９）。その後、再度Ｓ１へ戻るという計測ループを繰り返して行なうことにより、連続して蓄電池の劣化状態を検出できる。なお、蓄電池のＤＣＩＲから劣化状態を検出方法の一例としては以下の方法によることができる。 The deterioration state of the storage battery is detected from the DCIR of the storage battery obtained as described above (S9). Thereafter, the deterioration state of the storage battery can be continuously detected by repeatedly performing the measurement loop of returning to S1 again. In addition, the following method can be used as an example of a method for detecting the deterioration state from the DCIR of the storage battery.
例えば、蓄電池の満充電時の総容量ＳＯＨ（Ａｈ）を蓄電池の劣化状態として採用する場合、図５に示すように、予め作成した温度別の蓄電池のＤＣＩＲ及び充電状態（ＳＯＣ）と、蓄電池の劣化状態（ＳＯＨ）との相関を示すマップを用いて、本発明によって得られたＤＣＩＲ値と、別途算出したＳＯＣ値からＳＯＨを検出する。 For example, when the total capacity SOH (Ah) at the time of full charge of the storage battery is adopted as the deterioration state of the storage battery, as shown in FIG. 5, the DCIR and the charge state (SOC) of the storage battery by temperature created in advance and the storage battery Using a map showing the correlation with the deterioration state (SOH), SOH is detected from the DCIR value obtained by the present invention and the SOC value calculated separately.
なお、図５に示したマップの例においては、前回得られたＳＯＨと電流積算によって得たその時点における残存容量Ｑとから、ＳＯＣを求める（Ｑ／ＳＯＨ×１００）。このＳＯＣと本発明で得たＤＣＩＲ値と蓄電池の温度から、図５に示したマップより、更新されたＳＯＨを求めることができる。 In the example of the map shown in FIG. 5, the SOC is obtained from the previously obtained SOH and the remaining capacity Q at that time obtained by current integration (Q / SOH × 100). The updated SOH can be obtained from the map shown in FIG. 5 from the SOC, the DCIR value obtained in the present invention, and the temperature of the storage battery.
なお、本実施形態では、ＤＣＩＲから劣化状態を検出するステップとして、図５に示したマップを用いた例を説明したが、他に知られている方法であってもよい。例えば、初期状態の蓄電池のＤＣＩＲ値と、現時点でのＤＣＩＲ値との比率を蓄電池の劣化状態のパラメータとし、このパラメータ値によって、「良好」、「劣化」等のメッセージをＬＣＤパネル等の表示手段で表示したり、電子ブザーや電子音声等の音響・音声的手段により、蓄電池の劣化状態を使用者に告知する方法を用いてもよい。 In the present embodiment, an example using the map shown in FIG. 5 has been described as the step of detecting the deterioration state from DCIR, but other known methods may be used. For example, the ratio between the DCIR value of the storage battery in the initial state and the current DCIR value is used as a parameter for the deterioration state of the storage battery, and messages such as “good” and “deterioration” are displayed on the LCD panel or the like depending on the parameter value. Or a method of notifying the user of the deterioration state of the storage battery by acoustic / voice means such as an electronic buzzer or electronic voice.
本発明では、蓄電池の劣化状態のパラメータとして、ＤＣＩＲを検出する際、検出頻度は低いが、より高い精度のＤＣＩＲ値が得られる高負荷電流領域でのＤＣＩＲ１値を、検出頻度は高いが精度の低い低負荷電流領域でのＤＣＩＲ２値に優先させる。これにより、精度の高いＤＣＩＲ検出が可能となり、このＤＣＩＲを劣化状態パラメータとした蓄電池の劣化状態検出の精度を顕著に高めることができる。 In the present invention, when detecting DCIR as a parameter of the deterioration state of the storage battery, the detection frequency is low, but the DCIR1 value in the high load current region in which a higher accuracy DCIR value is obtained is detected with high frequency but with high accuracy. Prioritize the DCIR2 value in the low load current region. Thereby, DCIR detection with high accuracy becomes possible, and the accuracy of detection of the deterioration state of the storage battery using this DCIR as the deterioration state parameter can be remarkably increased.
なお、本実施形態では、高負荷電流域と低負荷電流域と２つの電流域に分けてＤＣＩＲを検出したが、使用モードに応じて、ＤＣＩＲ検出の負荷電流域を３つ以上に設定してもよい。 In this embodiment, DCIR is detected by dividing into two current regions, a high load current region and a low load current region, but the load current region for DCIR detection is set to three or more according to the use mode. Also good.
例えば３つの負荷電流域を設定する場合、高負荷電流域、中負荷電流域及び低負荷電流域を設ける。高負荷電流域は使用機器の使用モードにおける最大電流値に近い範囲に設定し、中負荷電流域は、使用頻度が高負荷電流域よりも多く、かつ、なるべく高負荷電流域に近い領域を設定、低負荷電流域は、使用頻度が中負荷電流域よりも多く、かつ、なるべく中負荷電流域に近い領域を設定する。その際、高負荷電流域と中負荷電流域と低負荷電流域は重複してはならない。 For example, when three load current regions are set, a high load current region, a medium load current region, and a low load current region are provided. The high load current range is set to a range close to the maximum current value in the use mode of the device used, and the medium load current range is set to a frequency that is more frequently used than the high load current range and as close to the high load current range as possible. The low load current region is set to a region that is used more frequently than the medium load current region and is as close to the medium load current region as possible. At that time, the high load current region, the medium load current region, and the low load current region should not overlap.
図６は、図５と同様に、蓄電池を電動車に搭載し、その時の蓄電池の放電負荷特性の一例を示す図である。高負荷電流域（図６に示す領域１）で検出されるＤＣＩＲをＤＣＩＲ１とし、中負荷電流域（図６に示す領域２）で検出されるＤＣＩＲを便宜上ＤＣＩＲ１．５とし、低負荷電流域（図６に示す領域３）で検出されるＤＣＩＲをＤＣＩＲ２とし、図７に示すフローによってＤＣＩＲの検出を行なう。 FIG. 6 is a diagram illustrating an example of a discharge load characteristic of the storage battery when the storage battery is mounted on the electric vehicle, similarly to FIG. 5. The DCIR detected in the high load current region (region 1 shown in FIG. 6) is DCIR1, the DCIR detected in the medium load current region (region 2 shown in FIG. 6) is DCIR1.5 for convenience, and the low load current region ( DCIR detected in the area 3) shown in FIG. 6 is DCIR2, and DCIR is detected by the flow shown in FIG.
図６に示した負荷電流推移において、常時蓄電池の負荷電流Ｉと電圧Ｖを測定し（Ｓ´１）、低負荷電流領域にてＤＣＩＲが検出できた場合（図６におけるポイントＡ及びＢ、図７におけるＳ´２）には、これをＤＣＩＲ２として記憶し（Ｓ´３）、中電流領域にてＤＣＩＲが検出できた場合（図６におけるポイントＣ、図７におけるＳ´４）には、これをＤＣＩＲ１．５として記憶し（Ｓ´５）、高負荷電流領域にてＤＣＩＲが検出できた場合（図６におけるポイントＤ、図７におけるＳ´６）には、これをＤＣＩＲ１として記憶する（Ｓ´７）。 In the load current transition shown in FIG. 6, when the load current I and voltage V of the constant storage battery are measured (S′1) and DCIR can be detected in the low load current region (points A and B in FIG. 6, FIG. 7 (S′2 in FIG. 7), this is stored as DCIR2 (S′3). When DCIR can be detected in the middle current region (point C in FIG. 6, S′4 in FIG. 7), this is stored. Is stored as DCIR1.5 (S′5), and when DCIR can be detected in the high load current region (point D in FIG. 6, S′6 in FIG. 7), this is stored as DCIR1 (S1). '7).
ＤＣＩＲ１が得られたときには、常にＤＣＩＲ１をＤＣＩＲとして採用する（Ｓ´９）が、ＤＣＩＲ１を検出後、ＤＣＩＲ１が得られないまま所定時間Ｔを経過した場合（Ｓ´８のＹｅｓ）、ＤＣＩＲ１の精度は低下していると考えられ、より直近に検出されたＤＣＩＲ２（図６に示すポイントＥ、図７のＳ´１２）もしくはＤＣＩＲ１．５をＤＣＩＲとして採用する（図７のＳ´１１）。 When DCIR1 is obtained, DCIR1 is always adopted as DCIR (S'9). However, when DCIR1 is detected and DCIR1 is not obtained and a predetermined time T has passed (Yes in S'8), the accuracy of DCIR1 is obtained. DCIR2 (point E shown in FIG. 6, S′12 in FIG. 7) or DCIR1.5 detected more recently is adopted as DCIR (S′11 in FIG. 7).
なお、最後のＤＣＩＲ１．５検出からの経過時間が前記した所定時間Ｔを経過している場合、このＤＣＩＲ１．５も誤差が生じているため、より直近のＤＣＩＲ２をＤＣＩＲとして採用する（Ｓ´１２）。 If the elapsed time from the last DCIR1.5 detection has exceeded the predetermined time T, an error has occurred in this DCIR1.5, so the most recent DCIR2 is adopted as the DCIR (S'12 ).
なお、図６の例では、所定時間Ｔ内にＤＣＩＲ２のみ得られているので、このＤＣＩＲ２を蓄電池のＤＣＩＲとすることになる。所定時間Ｔ内にＤＣＩＲ２とＤＣＩＲ１．５が得られている場合は、ＤＣＩＲ２を採用せず、ＤＣＩＲ１．５を蓄電池のＤＣＩＲとして採用する。 In the example of FIG. 6, since only DCIR2 is obtained within a predetermined time T, this DCIR2 is used as the DCIR of the storage battery. When DCIR2 and DCIR1.5 are obtained within the predetermined time T, DCIR2 is not adopted and DCIR1.5 is adopted as the DCIR of the storage battery.
上記より得られたＤＣＩＲ値より既述の方法によって蓄電池の劣化状態を検出し（Ｓ´１３）、再度Ｓ´１へ戻ることによって繰り返して連続的に蓄電池の劣化状態を検出できる。 From the DCIR value obtained above, the deterioration state of the storage battery is detected by the above-described method (S′13), and the deterioration state of the storage battery can be continuously detected repeatedly by returning to S′1 again.
なお、図６に示す例において、その後ＤＣＩＲ１．５が検出できた場合（図６に示すポイントＦ、図７におけるＳ´４）は、ＤＣＩＲ１．５を蓄電池のＤＣＩＲとする（Ｓ´１１）。さらに、ＤＣＩＲ１が得られたとき（図に示すポイントＧ、図７に示すＳ´６）は、これをＤＣＩＲとして採用する（Ｓ´９）。既述した説明により、ＤＣＩＲの検出精度の面で、ＤＣＩＲ２が最も高く、ＤＣＩＲ１が最も低く、ＤＣＩＲ１．５はこれらの中間に位置している。一方、検出頻度は、検出精度とは全く逆のＤＣＩＲ１＞ＤＣＩＲ１．５＞ＤＣＩＲ２の傾向となる。 In addition, in the example shown in FIG. 6, when DCIR1.5 is detectable after that (point F shown in FIG. 6, S'4 in FIG. 7), DCIR1.5 is made into DCIR of a storage battery (S'11). Further, when DCIR1 is obtained (point G shown in the figure, S′6 shown in FIG. 7), this is adopted as DCIR (S′9). According to the above description, in terms of DCIR detection accuracy, DCIR2 is the highest, DCIR1 is the lowest, and DCIR1.5 is located between these. On the other hand, the detection frequency tends to be DCIR1> DCIR1.5> DCIR2 which is completely opposite to the detection accuracy.
本発明では、ＤＣＩＲ２よりもＤＣＩＲ１．５を優先し、ＤＣＩＲ１．５よりもＤＣＩＲ１を優先採用する（Ｓ´９）。但し、前記した所定時間Ｔ内により精度の高いＤＣＩＲ１が得られない場合（Ｓ´８のＹｅｓ）は、直近に得られたＤＣＩＲ１．５をＤＣＩＲとして採用する（Ｓ´１１）。なお、ＤＣＩＲ１．５を得た時間から、さらに前記した所定時間内にＤＣＩＲ１．５もしくはＤＣＩＲ１が得られない場合（Ｓ´８のＹｅｓ、Ｓ´１０のＹｅｓ）は、ＤＣＩＲ２をＤＣＩＲＤＣＩＲとして採用する（Ｓ´１３）。 In the present invention, DCIR1.5 is prioritized over DCIR2, and DCIR1 is prioritized over DCIR1.5 (S'9). However, when DCIR1 with higher accuracy cannot be obtained within the predetermined time T (Yes in S'8), the most recently obtained DCIR1.5 is adopted as DCIR (S'11). If DCIR1.5 or DCIR1 cannot be obtained within the predetermined time described above from the time when DCIR1.5 is obtained (Yes in S′8, Yes in S′10), DCIR2 is adopted as DCIRDCIR ( S'13).
すなわち、所定時間内に現時点で採用しているＤＣＩＲｘ（ｘ＝１、１．５、２）と同負荷電流領域もしくは高負荷電流領域によるＤＣＩＲを得た場合は、この値をＤＣＩＲとして採用するが、所定時間に到達した時点で、現時点で採用しているＤＣＩＲｘ（ｘ＝１、１．５、２）よりも低負荷電流領域によるＤＣＩＲしか得られない場合、この値を蓄電池のＤＣＩＲとして採用する。 That is, when DCIR is obtained in the same load current region or high load current region as DCIRx (x = 1, 1.5, 2) currently employed within a predetermined time, this value is adopted as DCIR. When only a DCIR in a low load current region is obtained at a predetermined time when DCIRx (x = 1, 1.5, 2) used at present is obtained, this value is adopted as the DCIR of the storage battery. .
本発明では、検出精度のより高い負荷電流域でのＤＣＩＲ値を、検出精度のより低い低負荷電流域でのＤＣＩＲ値に優先して蓄電池のＤＣＩＲとするため、ＤＣＩＲの測定電流領域に何らの配慮もない、従来のＤＣＩＲ検出やこのＤＣＩＲ値に基いた蓄電池の劣化検出方法に比較して、高精度なＤＣＩＲ検出と、劣化検出を行なうことができる。 In the present invention, since the DCIR value in the load current region with higher detection accuracy is used as the DCIR of the storage battery in preference to the DCIR value in the low load current region with lower detection accuracy, there is no DCIR measurement current region. Compared with conventional DCIR detection and a storage battery deterioration detection method based on this DCIR value without consideration, highly accurate DCIR detection and deterioration detection can be performed.
負荷電流域の区分を４つ以上に増やした場合にも、同様な検出フローを用いてＤＣＩＲを検出することができる。 Even when the number of load current region sections is increased to four or more, DCIR can be detected using the same detection flow.
なお、本発明は、ＤＣＩＲ値によって劣化状態を検知できる蓄電池、例えば鉛蓄電池やニッケル水素蓄電池等の蓄電池に適用できる。 In addition, this invention is applicable to storage batteries which can detect a deterioration state by DCIR value, for example, storage batteries, such as a lead storage battery and a nickel hydride storage battery.
本発明の蓄電池の劣化状態検出方法は、前述したような電動車両用蓄電池をはじめとして、様々な用途の蓄電池の劣化状態検出方法として用いることができる。 The storage battery deterioration state detection method of the present invention can be used as a storage battery deterioration state detection method for various applications, including the electric vehicle storage battery as described above.
Claims (2)
前記負荷電流が高負荷電流域内である時点で前記ＤＣＩＲを検出してＤＣＩＲ１とし、
前記ＤＣＩＲ１を検出した際には、前記ＤＣＩＲ１を蓄電池のＤＣＩＲとし、
前記ＤＣＩＲ１検出後、所定時間内に高負荷電流域内で別のＤＣＩＲを検出しない場合に、遂次検出する前記負荷電流が低負荷電流域内である時点で前記ＤＣＩＲを検出してＤＣＩＲ２とし、
前記ＤＣＩＲ２を蓄電池のＤＣＩＲとすることを特徴とする蓄電池の劣化状態検出方法。 It is a storage battery deterioration state detection method for detecting a DCIR of the storage battery from a load current and a storage battery voltage flowing in the storage battery, and detecting a deterioration state of the storage battery from the DCIR.
When the load current is within a high load current range, the DCIR is detected and set to DCIR1,
When the DCIR1 is detected, the DCIR1 is set as the DCIR of the storage battery,
If another DCIR is not detected within a high load current range within a predetermined time after the detection of the DCIR1, the DCIR is detected at a point in time when the load current to be sequentially detected is within the low load current range, and is set to DCIR2.
A method for detecting a deterioration state of a storage battery, wherein the DCIR2 is a DCIR of the storage battery.
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