JP2018048910A - Power storage device - Google Patents

Power storage device Download PDF

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JP2018048910A
JP2018048910A JP2016184550A JP2016184550A JP2018048910A JP 2018048910 A JP2018048910 A JP 2018048910A JP 2016184550 A JP2016184550 A JP 2016184550A JP 2016184550 A JP2016184550 A JP 2016184550A JP 2018048910 A JP2018048910 A JP 2018048910A
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weighting coefficient
charge capacity
estimated
full charge
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JP6828339B2 (en
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俊雄 小田切
Toshio Odagiri
俊雄 小田切
西垣　研治
Kenji Nishigaki
研治 西垣
順一 波多野
Junichi Hatano
順一 波多野
筒井　雄介
Yusuke Tsutsui
雄介 筒井
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Toyota Industries Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Abstract

PROBLEM TO BE SOLVED: To provide a power storage device that accurately estimates a full-charge capacity.SOLUTION: An estimation unit 7, designed to estimate the full-charge capacity of a battery 2 included in a control circuit 3 of a power storage device 1, estimates a full-charge capacity using a current integrated value from a charge/discharge start time of the battery 2 to a charge/discharge start time and a difference in charge rates estimated using open-circuit voltages measured at the charge/discharge start time and the charge/discharge end time, adds together a previous confirmed full-charge capacity estimated at a previous charge/discharge end time multiplied by a first weighting coefficient and a full-charge capacity estimated at the present charge/discharge end time multiplied by a second weighting coefficient that is determined in accordance with the first weighting coefficient and estimates a present confirmed full-charge capacity, sets the first weighting coefficient to a value smaller than the currently set value and sets the second weighting coefficient to a value larger than the currently set value when the confirmed full-charge capacity is not estimated for a prescribed period.SELECTED DRAWING: Figure 1

Description

本発明は、満充電容量を推定する蓄電装置に関する。   The present invention relates to a power storage device that estimates a full charge capacity.

電池の充放電終了後に推定した満充電容量には、周辺環境の影響により生じたノイズを含んでいる可能性があるため、重み付け移動平均などを用いて満充電容量を推定し、ノイズの影響を軽減させている。   The full charge capacity estimated after the end of charging / discharging of the battery may include noise caused by the influence of the surrounding environment, so the full charge capacity is estimated using a weighted moving average etc. It is reduced.

関連する技術として、特許文献１及び特許文献２などが知られている。   As related techniques, Patent Document 1 and Patent Document 2 are known.

国際公開第２０１２／１０５４９２号International Publication No. 2012/105492 特開２０１１−００７５６４号公報JP 2011-007564 A

しかしながら、満充電容量を所定期間推定しない場合、例えば電池を長期間放置した場合、電池は保存劣化をしているため、所定期間を経過した後に重み付け移動平均を用いて満充電容量を推定すると、重み付け係数の影響により実際の満充電容量と乖離した満充電容量となる。   However, if the full charge capacity is not estimated for a predetermined period, for example, if the battery is left for a long period of time, the battery has deteriorated during storage, so if the full charge capacity is estimated using a weighted moving average after the predetermined period has elapsed, Due to the influence of the weighting coefficient, the full charge capacity deviates from the actual full charge capacity.

本発明の一側面に係る目的は、満充電容量を精度よく推定する蓄電装置を提供することである。   An object according to one aspect of the present invention is to provide a power storage device that accurately estimates a full charge capacity.

本発明に係る一つの形態である蓄電装置は、電池と、電池の満充電容量を推定する推定部と、を備える。
推定部は、電池の充放電開始時刻から充放電終了時刻までの電流積算値と、充放電開始時刻及び充放電終了時刻に計測した開回路電圧を用いて推定した充電率の差とを用いて満充電容量を推定する。続いて、推定部は、前回の充放電終了後に推定した前回の確定満充電容量と第一の重み付け係数とを乗算した値と、今回の充放電終了後に推定した満充電容量と第一の重み付け係数に応じて決定される第二の重み付け係数とを乗算した値と、を加算して今回の確定満充電容量を推定する。また、推定部は、確定満充電容量が所定期間推定されない場合、第一の重み付け係数は現在設定されている値より小さい値に設定し、第二の重み付け係数は現在設定されている値より大きい値に設定する。 A power storage device according to one aspect of the present invention includes a battery and an estimation unit that estimates a full charge capacity of the battery.
The estimation unit uses the integrated current value from the charge / discharge start time to the charge / discharge end time of the battery and the difference in charge rate estimated using the open circuit voltage measured at the charge / discharge start time and the charge / discharge end time. Estimate the full charge capacity. Subsequently, the estimation unit multiplies the previous determined full charge capacity estimated after the end of the previous charge / discharge by the first weighting factor, the full charge capacity estimated after the end of the current charge / discharge, and the first weighting. The value determined by multiplying the second weighting coefficient determined according to the coefficient is added to estimate the current determined full charge capacity. In addition, when the determined full charge capacity is not estimated for a predetermined period, the estimation unit sets the first weighting coefficient to a value smaller than the currently set value, and the second weighting coefficient is larger than the currently set value. Set to value.

推定部は、所定期間が長いほど、第一の重み付け係数は小さい値に設定し、第二の重み付け係数は大きい値に設定する。
推定部は、所定期間における電池の温度が所定温度より高い場合、第一の重み付け係数は現在設定されている値より小さい値に設定し、第二の重み付け係数は現在設定されている値より大きい値に設定する。 The estimation unit sets the first weighting coefficient to a smaller value and the second weighting coefficient to a larger value as the predetermined period is longer.
The estimation unit sets the first weighting coefficient to a value smaller than the currently set value and the second weighting coefficient larger than the currently set value when the battery temperature in the predetermined period is higher than the predetermined temperature. Set to value.

推定部は、所定温度が高いほど、第一の重み付け係数は小さい値に設定し、第二の重み付け係数は大きい値に設定する。
推定部は、所定期間における充電率が所定充電率より高い場合、第一の重み付け係数は現在設定されている値より小さい値に設定し、第二の重み付け係数は現在設定されている値より大きい値に設定する。 The estimation unit sets the first weighting coefficient to a smaller value and the second weighting coefficient to a larger value as the predetermined temperature is higher.
The estimation unit sets the first weighting coefficient to a value smaller than the currently set value when the charging rate in the predetermined period is higher than the predetermined charging rate, and the second weighting coefficient is larger than the currently set value. Set to value.

推定部は、所定充電率が高いほど、第一の重み付け係数は小さい値に設定し、第二の重み付け係数は大きい値に設定する。   The estimation unit sets the first weighting coefficient to a smaller value and the second weighting coefficient to a larger value as the predetermined charging rate is higher.

満充電容量を精度よく推定できる。   The full charge capacity can be estimated accurately.

蓄電装置の一実施例を示す図である。It is a figure which shows one Example of an electrical storage apparatus. 重み付け係数と容量維持率と日数との関係を示す図である。It is a figure which shows the relationship between a weighting coefficient, a capacity maintenance rate, and the number of days. 蓄電装置の動作の一実施例を示すフロー図である。It is a flowchart which shows one Example of operation | movement of an electrical storage apparatus.

以下図面に基づいて実施形態について詳細を説明する。
図１は、蓄電装置１の一実施例を示す図である。電池２の満充電容量を推定可能な蓄電装置１は、例えば、電池２、制御回路３、電流計測部４、電圧計測部５、温度計測部６を備える。蓄電装置１は、例えば、車両に搭載された電池パックなどが考えられる。電池２は、電池パックに設けられた二次電池であり、例えば、ニッケル水素電池やリチウムイオン電池などの二次電池又は蓄電素子などである。なお、電池２は複数の電池を接続した組電池を用いてもよい。 Hereinafter, embodiments will be described in detail with reference to the drawings.
FIG. 1 is a diagram illustrating an example of a power storage device 1. The power storage device 1 that can estimate the full charge capacity of the battery 2 includes, for example, a battery 2, a control circuit 3, a current measurement unit 4, a voltage measurement unit 5, and a temperature measurement unit 6. The power storage device 1 may be, for example, a battery pack mounted on a vehicle. The battery 2 is a secondary battery provided in the battery pack, and is, for example, a secondary battery such as a nickel metal hydride battery or a lithium ion battery, or a storage element. The battery 2 may be an assembled battery in which a plurality of batteries are connected.

制御回路３は、例えば、ＣＰＵ（Central Processing Unit）、マルチコアＣＰＵ、プログラマブルなデバイス（ＦＰＧＡ（Field Programmable Gate Array）やＰＬＤ（Programmable Logic Device）など）を用いた回路が考えられる。また、制御回路３は、内部又は外部に備えられている記憶部を備え、記憶部に記憶されている蓄電装置１の各部を制御するプログラムを読み出して実行する。なお、本例においては制御回路３を用いて説明をするが、制御回路３が実行する制御を、例えば車両に搭載されている一つ以上のＥＣＵ（Electronic Control Unit）などに行わせてもよい。   As the control circuit 3, for example, a circuit using a CPU (Central Processing Unit), a multi-core CPU, a programmable device (FPGA (Field Programmable Gate Array), PLD (Programmable Logic Device), etc.) can be considered. The control circuit 3 includes a storage unit provided inside or outside, and reads and executes a program for controlling each unit of the power storage device 1 stored in the storage unit. In this example, the control circuit 3 is used for description. However, the control executed by the control circuit 3 may be performed by, for example, one or more ECUs (Electronic Control Units) mounted on the vehicle. .

制御回路３は、電池２の満充電容量を推定する推定部７を有し、推定部７は、電池２の充放電開始時刻から充放電終了時刻までの電流積算値ΔＡｈ［Ａｈ］と、充放電開始時刻及び充放電終了時刻に計測した開回路電圧を用いて推定した充電率の差ΔＳＯＣ［％］とを用いて満充電容量Ｆｃｃ０を推定する。   The control circuit 3 includes an estimation unit 7 that estimates the full charge capacity of the battery 2. The estimation unit 7 includes a current integrated value ΔAh [Ah] from the charge / discharge start time to the charge / discharge end time of the battery 2, The full charge capacity Fcc0 is estimated using the charge rate difference ΔSOC [%] estimated using the open circuit voltage measured at the discharge start time and the charge / discharge end time.

ΔＳＯＣは、充放電開始時刻に計測した開回路電圧を用いて推定した充電率ＳＯＣ１と、充放電終了時刻に計測した開回路電圧を用いて推定した充電率ＳＯＣ２との差を用いて求める。式１を参照。
ΔＳＯＣ＝｜ＳＯＣ１−ＳＯＣ２｜ 式１
また、満充電容量Ｆｃｃ０は式２を用いて推定する。
Ｆｃｃ０＝ΔＡｈ／ΔＳＯＣ 式２ ΔSOC is obtained by using the difference between the charge rate SOC1 estimated using the open circuit voltage measured at the charge / discharge start time and the charge rate SOC2 estimated using the open circuit voltage measured at the charge / discharge end time. See Equation 1.
ΔSOC = | SOC1-SOC2 |
Further, the full charge capacity Fcc0 is estimated using Equation 2.
Fcc0 = ΔAh / ΔSOC Equation 2

制御回路３の推定部７は、重み付け移動平均を用いて周辺環境の影響により生じたノイズを除去する。重み付け移動平均としては、例えば、前回の充放電終了後に推定した前回の確定満充電容量Ｆｃｃ１と重み付け係数α（第一の重み付け係数）とを乗算した値（Ｆｃｃ１×α）と、今回の充放電終了後に推定した満充電容量Ｆｃｃ０と重み付け係数αに応じて決定される重み付け係数β（＝１−α：第二の重み付け係数）とを乗算した値（Ｆｃｃ０×β）と、を加算して今回の確定満充電容量Ｆｃｃ１を推定する。式３を参照。
今回のＦｃｃ１＝前回のＦｃｃ１×α＋Ｆｃｃ０×β 式３ The estimation unit 7 of the control circuit 3 removes noise caused by the influence of the surrounding environment using the weighted moving average. As the weighted moving average, for example, the value (Fcc1 × α) obtained by multiplying the previous determined full charge capacity Fcc1 estimated after the end of the previous charge / discharge and the weighting coefficient α (first weighting coefficient), and the current charge / discharge A value (Fcc0 × β) obtained by multiplying the full charge capacity Fcc0 estimated after the completion and the weighting factor β (= 1−α: second weighting factor) determined according to the weighting factor α is added and this time Estimated final full charge capacity Fcc1. See Equation 3.
Fcc1 this time = previous Fcc1 × α + Fcc0 × β Equation 3

また、制御回路３の推定部７は、前回の充放電終了後に前回の確定満充電容量が推定されてから、確定満充電容量Ｆｃｃ１が所定期間Ｔ推定されていない場合、今回のＦｃｃ１を推定するときに、重み付け係数αは現在設定されている値より小さい値に設定し、重み付け係数βは現在設定されている値より大きい値に設定する。例えば、通常時（前回の確定満充電容量が推定されてから、所定期間Ｔ内に今回の確定満充電容量Ｆｃｃ１が推定されているとき）に、重み付け係数αが０．９、重み付け係数βが０．１であれば、確定満充電容量Ｆｃｃ１が所定期間Ｔ推定されていない場合には重み付け係数αを０．５、重み付け係数βを０．５とする。すなわち、保存劣化を考慮して、前回の確定満充電容量Ｆｃｃ１よりも、所定期間Ｔを経過した後の最初の充放電終了後に推定した満充電容量Ｆｃｃ０を重視する重み付けをすることで、今回の確定満充電容量Ｆｃｃ１を実際の満充電容量Ｆｃｃに近づけることができるので、今回の確定満充電容量Ｆｃｃ１を精度よく推定できる。   Further, the estimation unit 7 of the control circuit 3 estimates the current Fcc1 when the determined full charge capacity Fcc1 has not been estimated for a predetermined period T after the previous determined full charge capacity is estimated after the previous charge / discharge. Sometimes, the weighting coefficient α is set to a value smaller than the currently set value, and the weighting coefficient β is set to a value larger than the currently set value. For example, in the normal state (when the final determined full charge capacity Fcc1 is estimated within a predetermined period T after the previous determined full charge capacity is estimated), the weighting coefficient α is 0.9 and the weighting coefficient β is If it is 0.1, the weighting coefficient α is set to 0.5 and the weighting coefficient β is set to 0.5 when the determined full charge capacity Fcc1 is not estimated for the predetermined period T. In other words, in consideration of storage deterioration, weighting that places an emphasis on the full charge capacity Fcc0 estimated after the completion of the first charge / discharge after the predetermined period T has passed is weighted more than the previous determined full charge capacity Fcc1. Since the confirmed full charge capacity Fcc1 can be brought close to the actual full charge capacity Fcc, the current confirmed full charge capacity Fcc1 can be accurately estimated.

なお、通常時の重み付け係数α、β、及び、所定期間Ｔ推定されていない場合に用いる重み付け係数α、βは、記憶部に記憶されている。また、重み付け係数αは０．９や０．１に限らず他の値でもよく、βも０．１や０．５に限らず他の値でもよい。また、前回の確定満充電容量Ｆｃｃ１は、前々回の確定満充電容量Ｆｃｃ１×α＋前回の充放電終了後に推定した満充電容量Ｆｃｃ０×βによって推定される。   The normal weighting coefficients α and β and the weighting coefficients α and β used when the predetermined period T is not estimated are stored in the storage unit. Further, the weighting coefficient α is not limited to 0.9 or 0.1, and may be other values, and β is not limited to 0.1 or 0.5, and may be other values. The previous determined full charge capacity Fcc1 is estimated by the previous determined full charge capacity Fcc1 × α + the full charge capacity Fcc0 × β estimated after the end of the previous charge / discharge.

図２は、重み付け係数α、βと満充電容量（又は容量維持率）と日数（時間）との関係を示す図である。図２においては縦軸に満充電容量が示され、横軸に日数が示されている。また、図２の曲線２１（実線）は電池２の実際の満充電容量Ｆｃｃを示す曲線である。曲線２２（破線）は、確定満充電容量Ｆｃｃ１を所定期間Ｔ推定しない場合でも、式３において重み付け係数αを０．９とし重み付け係数βを０．１とした場合の確定満充電容量Ｆｃｃ１の推移を示す曲線である。また、曲線２３（一点鎖線）は、確定満充電容量Ｆｃｃ１を所定期間Ｔ推定しない場合に、所定期間Ｔを経過後、式３において重み付け係数αを０．５とし重み付け係数βを０．５としたときの確定満充電容量Ｆｃｃ１の推移を示す曲線である。   FIG. 2 is a diagram showing the relationship among the weighting coefficients α and β, the full charge capacity (or capacity maintenance rate), and the number of days (hours). In FIG. 2, the vertical axis indicates the full charge capacity, and the horizontal axis indicates the number of days. A curve 21 (solid line) in FIG. 2 is a curve showing the actual full charge capacity Fcc of the battery 2. Curve 22 (broken line) shows the transition of the determined full charge capacity Fcc1 when the weighting coefficient α is 0.9 and the weighting coefficient β is 0.1 in Equation 3, even when the determined full charge capacity Fcc1 is not estimated for a predetermined period T. It is a curve which shows. Further, the curve 23 (dashed line) indicates that when the determined full charge capacity Fcc1 is not estimated for the predetermined period T, after the predetermined period T has elapsed, the weighting coefficient α is set to 0.5 and the weighting coefficient β is set to 0.5 in Expression 3. It is a curve which shows transition of the fixed full charge capacity | capacitance Fcc1 when doing.

曲線２２と曲線２３とは、０日から２０日まで、式３の重み付け係数αを０．９とし、重み付け係数βを０．１としているので、曲線２２、２３は同じ確定満充電容量Ｆｃｃ１を推定する。また、曲線２２、２３は曲線２１に近い曲線を描く。   Since the curves 22 and 23 have a weighting coefficient α of Equation 3 of 0.9 and a weighting coefficient β of 0.1 from the 0th day to the 20th day, the curves 22 and 23 have the same determined full charge capacity Fcc1. presume. Further, the curves 22 and 23 draw a curve close to the curve 21.

続いて、２０日から４０日（所定期間Ｔ）において、電池２は長期間放置されるため、保存劣化により実際の満充電容量Ｆｃｃは曲線２１に示すように低下する。
続いて、４０日（所定期間Ｔを経過した後）において電池２の充放電終了後、式３の重み付け係数αが０．９、重み付け係数βが０．１のままだと曲線２２と曲線２１とは乖離する。その理由は、２０日（所定期間Ｔの開始時刻前）に推定した確定満充電容量Ｆｃｃ１を前回の確定満充電容量Ｆｃｃ１とし、この前回の確定満充電容量Ｆｃｃ１を重視する重み付けがされるとともに、４０日において電池２の充放電終了後に推定された満充電容量Ｆｃｃ０に対する重み付けが軽視されているためである。そのため、４０日において電池２の充放電終了後に推定された今回の確定満充電容量Ｆｃｃ１が、２０日における実際の満充電容量Ｆｃｃに近づいてしまう。 Subsequently, since the battery 2 is left for a long period of time from the 20th to the 40th (predetermined period T), the actual full charge capacity Fcc decreases as shown by the curve 21 due to storage deterioration.
Subsequently, after the end of charging / discharging of the battery 2 on the 40th day (after a predetermined period T has elapsed), the curve 22 and the curve 21 are obtained when the weighting coefficient α of Expression 3 remains 0.9 and the weighting coefficient β remains 0.1. Is different from The reason is that the determined full charge capacity Fcc1 estimated on the 20th (before the start time of the predetermined period T) is set as the previous determined full charge capacity Fcc1, and weighting is given weighting on the previous determined full charge capacity Fcc1. This is because the weighting for the full charge capacity Fcc0 estimated after the completion of charging / discharging of the battery 2 on the 40th day is neglected. For this reason, the current confirmed full charge capacity Fcc1 estimated after the end of charging / discharging of the battery 2 on the 40th day approaches the actual full charge capacity Fcc on the 20th day.

更に、図２に示すように、式３の重み付け係数αが０．９、重み付け係数βが０．１のままだと、曲線２２が曲線２１に一致するまでに時間を要してしまう。その理由は、所定期間Ｔを経過した後の最初の充放電終了後、前回の確定満充電容量Ｆｃｃ１を重視する重み付けをして今回の確定満充電容量Ｆｃｃ１を推定すると、今回の確定満充電容量Ｆｃｃ１と実際の満充電容量Ｆｃｃとが乖離するので、曲線２２が曲線２１に一致するまでに時間がかかるためである。   Furthermore, as shown in FIG. 2, if the weighting coefficient α in Expression 3 is 0.9 and the weighting coefficient β is 0.1, it takes time until the curve 22 matches the curve 21. The reason for this is that, after the completion of the first charge / discharge after the elapse of the predetermined period T, when the weight of the previous determined full charge capacity Fcc1 is weighted and the current determined full charge capacity Fcc1 is estimated, the current determined full charge capacity This is because it takes time for the curve 22 to coincide with the curve 21 because Fcc1 and the actual full charge capacity Fcc are different.

そこで、所定期間Ｔを経過した後、４０日において充放電終了後、保存劣化を考慮して式３の重み付け係数αを０．５、重み付け係数βを０．５に設定し、２０日に推定した前回の確定満充電容量Ｆｃｃ１よりも、４０日において電池２の充放電終了後に推定した満充電容量Ｆｃｃ０を重視する重み付けをする。そうすると４０日において充放電終了後に推定した満充電容量Ｆｃｃ０は、所定期間Ｔを経過した後に推定され、保存劣化の影響が反映されているので、実際の満充電容量Ｆｃｃに近い値となる。よって、今回の確定満充電容量Ｆｃｃ１を精度よく推定できる。   Therefore, after the predetermined period T has elapsed, after charging / discharging is completed on the 40th, the storage coefficient is taken into consideration and the weighting coefficient α in Equation 3 is set to 0.5 and the weighting coefficient β is set to 0.5 to estimate on the 20th. The weighting emphasizing the full charge capacity Fcc0 estimated after the end of charging / discharging of the battery 2 on the 40th is given rather than the previous determined full charge capacity Fcc1. Then, the full charge capacity Fcc0 estimated after the end of charging / discharging on the 40th is estimated after the predetermined period T has elapsed and reflects the influence of storage deterioration, and thus becomes a value close to the actual full charge capacity Fcc. Therefore, the current confirmed full charge capacity Fcc1 can be accurately estimated.

更に、図２に示すように、式３の重み付け係数αを０．５、重み付け係数βを０．５にすることで、曲線２３が曲線２１に一致するまでに時間を早くすることができる。その理由は、所定期間Ｔを経過した後の最初の充放電終了後に推定した満充電容量Ｆｃｃ０を重視する重み付けをして今回の確定満充電容量Ｆｃｃ１を推定すると、今回の確定満充電容量Ｆｃｃ１と実際の満充電容量Ｆｃｃとが近い値となるため、曲線２３が曲線２１に一致するまでの時間を短縮させることができる。   Further, as shown in FIG. 2, by setting the weighting coefficient α in Equation 3 to 0.5 and the weighting coefficient β to 0.5, the time can be shortened until the curve 23 matches the curve 21. The reason for this is that when the final full charge capacity Fcc1 is estimated by weighting the full charge capacity Fcc0 estimated after the completion of the first charge / discharge after the predetermined period T has elapsed, Since the actual full charge capacity Fcc is a close value, the time until the curve 23 matches the curve 21 can be shortened.

なお、制御回路３の推定部７は、所定期間Ｔが長いほど、重み付け係数αは小さい値に設定し、重み付け係数βは大きい値に設定する。すなわち、所定期間Ｔが長くなるほど、電池２の充放電終了後の保存劣化は大きくなるため、所定期間Ｔの開始時刻前に推定した確定満充電容量Ｆｃｃ１（前回の確定満充電容量Ｆｃｃ１）よりも、所定期間Ｔを経過した後の最初の充放電終了後に推定した満充電容量Ｆｃｃ０を重視する重み付けをする。そうすると、満充電容量Ｆｃｃ０は、所定期間Ｔを経過した後に推定されているため、保存劣化の影響が反映され、実際の満充電容量Ｆｃｃに近い値となるので、今回の確定満充電容量Ｆｃｃ１を精度よく推定できる。   The estimation unit 7 of the control circuit 3 sets the weighting coefficient α to a smaller value and sets the weighting coefficient β to a larger value as the predetermined period T is longer. That is, as the predetermined period T becomes longer, the storage deterioration after the end of charging / discharging of the battery 2 becomes larger. Therefore, the determined full charge capacity Fcc1 estimated before the start time of the predetermined period T (previous determined full charge capacity Fcc1). The weighting is performed with emphasis on the full charge capacity Fcc0 estimated after the completion of the first charge / discharge after the predetermined period T has elapsed. Then, since the full charge capacity Fcc0 is estimated after the predetermined period T has elapsed, the influence of storage deterioration is reflected and becomes a value close to the actual full charge capacity Fcc. It can be estimated accurately.

また、制御回路３の推定部７は、所定期間Ｔにおける電池２の温度が所定温度より高い場合、重み付け係数αは現在設定されている値より小さい値に設定し、重み付け係数βは現在設定されている値より大きい値に設定する。また、制御回路３の推定部７は、電池２の所定温度が高いほど、重み付け係数αは小さい値に設定し、重み付け係数βは大きい値に設定する。すなわち、電池２の温度が所定温度より高くなると、電池２の劣化により満充電容量が小さくなるため、所定期間Ｔを経過した後の最初の充放電終了後に推定した満充電容量Ｆｃｃ０を重視する重み付けをする。そうすると、満充電容量Ｆｃｃ０は、所定期間Ｔを経過した後に推定されているため、電池２の温度及び保存劣化の影響が反映され、実際の満充電容量Ｆｃｃに近い値となるので、今回の確定満充電容量Ｆｃｃ１を精度よく推定できる。なお、電池２の温度は、温度計測部６を用いて計測する。また、制御回路３は、所定期間Ｔにおいて計測した温度の平均を算出し、その平均温度を温度として用いてもよい。   In addition, when the temperature of the battery 2 in the predetermined period T is higher than the predetermined temperature, the estimation unit 7 of the control circuit 3 sets the weighting coefficient α to a value smaller than the currently set value, and the weighting coefficient β is currently set. Set to a value greater than the current value. The estimation unit 7 of the control circuit 3 sets the weighting coefficient α to a smaller value and sets the weighting coefficient β to a larger value as the predetermined temperature of the battery 2 is higher. That is, when the temperature of the battery 2 becomes higher than the predetermined temperature, the full charge capacity becomes small due to the deterioration of the battery 2, and therefore, the weighting emphasizing the full charge capacity Fcc0 estimated after the completion of the first charge / discharge after the predetermined period T has elapsed. do. Then, since the full charge capacity Fcc0 is estimated after the predetermined period T has elapsed, the effect of the temperature of the battery 2 and storage deterioration is reflected and becomes a value close to the actual full charge capacity Fcc. The full charge capacity Fcc1 can be accurately estimated. The temperature of the battery 2 is measured using the temperature measuring unit 6. Further, the control circuit 3 may calculate an average of the temperatures measured in the predetermined period T and use the average temperature as the temperature.

また、制御回路３の推定部７は、所定期間Ｔにおける充電率が所定充電率より高い場合、重み付け係数αは現在設定されている値より小さい値に設定し、重み付け係数βは現在設定されている値より大きい値に設定する。また、制御回路３の推定部７は、所定充電率が高いほど、重み付け係数αは小さい値に設定し、重み付け係数βは大きい値に設定する。すなわち、電池２の充電率が所定充電率より高くなると、電池２の劣化により満充電容量が小さくなるため、所定期間Ｔを経過した後の最初の充放電終了後に推定した満充電容量Ｆｃｃ０を重視する重み付けをする。そうすると、満充電容量Ｆｃｃ０は、所定期間Ｔを経過した後に推定されているため、電池２の温度及び保存劣化の影響が反映され、実際の満充電容量Ｆｃｃに近い値となるので、今回の確定満充電容量Ｆｃｃ１を精度よく推定できる。   In addition, when the charging rate in the predetermined period T is higher than the predetermined charging rate, the estimation unit 7 of the control circuit 3 sets the weighting coefficient α to a value smaller than the currently set value, and the weighting coefficient β is currently set. Set to a value greater than the current value. The estimation unit 7 of the control circuit 3 sets the weighting coefficient α to a smaller value and sets the weighting coefficient β to a larger value as the predetermined charging rate is higher. That is, when the charging rate of the battery 2 becomes higher than the predetermined charging rate, the full charging capacity becomes small due to the deterioration of the battery 2, and therefore, the full charging capacity Fcc0 estimated after the completion of the first charging / discharging after the predetermined period T has elapsed is emphasized. Weight to be Then, since the full charge capacity Fcc0 is estimated after the predetermined period T has elapsed, the effect of the temperature of the battery 2 and storage deterioration is reflected and becomes a value close to the actual full charge capacity Fcc. The full charge capacity Fcc1 can be accurately estimated.

蓄電装置１の動作について説明をする。
図３は、蓄電装置１の動作の一実施例を示すフロー図である。ステップＳ１で制御回路３は充放電終了を検出すると、ステップＳ２で制御回路３は満充電容量Ｆｃｃ０を推定する。すなわち、制御回路３は、電池２の充放電開始時刻から充放電終了時刻までの電流積算値ΔＡｈ［Ａｈ］と、充放電開始時刻及び充放電終了時刻に計測した開回路電圧を用いて推定した充電率の差ΔＳＯＣ［％］とを用いて満充電容量Ｆｃｃ０を推定する。式２を参照。 The operation of the power storage device 1 will be described.
FIG. 3 is a flowchart illustrating an example of the operation of the power storage device 1. When the control circuit 3 detects the end of charge / discharge in step S1, the control circuit 3 estimates the full charge capacity Fcc0 in step S2. That is, the control circuit 3 estimates using the integrated current value ΔAh [Ah] from the charge / discharge start time to the charge / discharge end time of the battery 2 and the open circuit voltage measured at the charge / discharge start time and the charge / discharge end time. The full charge capacity Fcc0 is estimated using the difference ΔSOC [%] in the charging rate. See Equation 2.

ステップＳ３では、制御回路３が所定期間Ｔにおいて確定満充電容量Ｆｃｃ１が推定されたか否かを判定し、所定期間Ｔに推定をしている場合（Ｙｅｓ）にはステップＳ４に移行し、所定期間Ｔに推定をしていない場合（Ｎｏ）にはステップＳ５に移行する。   In step S3, the control circuit 3 determines whether or not the definite full charge capacity Fcc1 has been estimated in the predetermined period T. If it is estimated in the predetermined period T (Yes), the process proceeds to step S4, and the predetermined period If T is not estimated (No), the process proceeds to step S5.

ステップＳ４では、通常時の重み付け係数α、βを用いて、式３に示すように今回の確定満充電容量Ｆｃｃ１を推定する。すなわち、前回の確定満充電容量Ｆｃｃ１を重視する重み付けをして今回の確定満充電容量Ｆｃｃ１を推定する。例えば、重み付け係数αを０．９、重み付け係数βを０．１として確定満充電容量Ｆｃｃ１を推定する。   In step S4, the current determined full charge capacity Fcc1 is estimated as shown in Expression 3 using the normal weighting coefficients α and β. In other words, the current determined full charge capacity Fcc1 is estimated by weighting the previous determined full charge capacity Fcc1. For example, the determined full charge capacity Fcc1 is estimated by setting the weighting coefficient α to 0.9 and the weighting coefficient β to 0.1.

ステップＳ５では、確定満充電容量Ｆｃｃ１が所定期間Ｔ推定されない場合、制御回路３は通常時の重み付け係数α、βを変更して、式３に示すように今回の確定満充電容量Ｆｃｃ１を推定する。すなわち、重み付け係数αを現在設定されている通常時の重み付け係数αより小さい値に設定し、重み付け係数βを現在設定されている通常時の重み付け係数βより大きい値に設定し、所定期間Ｔを経過した後の最初の充放電終了後に推定した満充電容量Ｆｃｃ０を重視する重み付けをし、今回の確定満充電容量Ｆｃｃ１を推定する。例えば、重み付け係数αを０．９→０．５、重み付け係数βを０．１→０．５として確定満充電容量Ｆｃｃ１を推定する。   In step S5, when the determined full charge capacity Fcc1 is not estimated for the predetermined period T, the control circuit 3 changes the normal weighting coefficients α and β and estimates the current determined full charge capacity Fcc1 as shown in Expression 3. . That is, the weighting coefficient α is set to a value smaller than the currently set normal weighting coefficient α, the weighting coefficient β is set to a value larger than the currently set normal weighting coefficient β, and the predetermined period T is set. Weighting is performed with emphasis on the full charge capacity Fcc0 estimated after the completion of the first charge / discharge after elapses, and the current determined full charge capacity Fcc1 is estimated. For example, the determined full charge capacity Fcc1 is estimated by setting the weighting coefficient α to 0.9 → 0.5 and the weighting coefficient β to 0.1 → 0.5.

このように、所定期間Ｔにおいて確定満充電容量Ｆｃｃ１が推定されていない場合、電池２の保存劣化を考慮して、前回の確定満充電容量Ｆｃｃ１よりも、今回の充放電終了後に推定した満充電容量Ｆｃｃ０を重視する重み付けをすることで、今回の確定満充電容量Ｆｃｃ１を実際の満充電容量Ｆｃｃに近づけられるので、確定満充電容量Ｆｃｃ１を精度よく推定できる。   As described above, when the determined full charge capacity Fcc1 is not estimated in the predetermined period T, the full charge estimated after the end of the current charge / discharge is more than the previous determined full charge capacity Fcc1 in consideration of the storage deterioration of the battery 2. By weighting the capacity Fcc0 as important, the current determined full charge capacity Fcc1 can be brought close to the actual full charge capacity Fcc, so that the determined full charge capacity Fcc1 can be accurately estimated.

また、本発明は、以上の実施の形態に限定されるものでなく、本発明の要旨を逸脱しない範囲内で種々の改良、変更が可能である。   The present invention is not limited to the above-described embodiment, and various improvements and modifications can be made without departing from the gist of the present invention.

１ 蓄電装置
２ 電池
３ 制御回路
４ 電流計測部
５ 電圧計測部
６ 温度計測部
７ 推定部
DESCRIPTION OF SYMBOLS 1 Power storage device 2 Battery 3 Control circuit 4 Current measurement part 5 Voltage measurement part 6 Temperature measurement part 7 Estimation part

Claims (6)

電池と、前記電池の満充電容量を推定する推定部と、を備える蓄電装置であって、
前記推定部は、
前記電池の充放電開始時刻から充放電終了時刻までの電流積算値と、前記充放電開始時刻及び前記充放電終了時刻に計測した開回路電圧を用いて推定した充電率の差とを用いて満充電容量を推定し、
前回の充放電終了後に推定した前回の確定満充電容量と第一の重み付け係数とを乗算した値と、今回の充放電終了後に推定した前記満充電容量と前記第一の重み付け係数に応じて決定される第二の重み付け係数とを乗算した値と、を加算して今回の確定満充電容量を推定し、
前記確定満充電容量が所定期間推定されない場合、前記第一の重み付け係数は現在設定されている値より小さい値に設定し、前記第二の重み付け係数は現在設定されている値より大きい値に設定する、
ことを特徴とする蓄電装置。 A battery and an estimation unit for estimating a full charge capacity of the battery,
The estimation unit includes
Using the integrated current value from the charge / discharge start time to the charge / discharge end time of the battery and the difference in charge rate estimated using the open circuit voltage measured at the charge / discharge start time and the charge / discharge end time. Estimate charging capacity,
Determined according to a value obtained by multiplying the previous determined full charge capacity estimated after the end of the previous charge / discharge and the first weighting coefficient, and the full charge capacity estimated after the end of the current charge / discharge and the first weighting coefficient. The value obtained by multiplying the second weighting factor to be added is added to estimate the determined full charge capacity,
If the determined full charge capacity is not estimated for a predetermined period, the first weighting factor is set to a value smaller than the currently set value, and the second weighting factor is set to a value larger than the currently set value. To
A power storage device. 請求項１に記載の蓄電装置であって、
前記推定部は、
前記所定期間が長いほど、前記第一の重み付け係数は小さい値に設定し、前記第二の重み付け係数は大きい値に設定する、
ことを特徴とする蓄電装置。 The power storage device according to claim 1,
The estimation unit includes
As the predetermined period is longer, the first weighting coefficient is set to a smaller value, and the second weighting coefficient is set to a larger value.
A power storage device. 請求項１に記載の蓄電装置であって、
前記推定部は、
前記所定期間における前記電池の温度が所定温度より高い場合、前記第一の重み付け係数は現在設定されている値より小さい値に設定し、前記第二の重み付け係数は現在設定されている値より大きい値に設定する、
ことを特徴とする蓄電装置。 The power storage device according to claim 1,
The estimation unit includes
When the temperature of the battery in the predetermined period is higher than the predetermined temperature, the first weighting coefficient is set to a value smaller than the currently set value, and the second weighting coefficient is larger than the currently set value. Set to value,
A power storage device. 請求項３に記載の蓄電装置であって、
前記推定部は、
前記所定温度が高いほど、前記第一の重み付け係数は小さい値に設定し、前記第二の重み付け係数は大きい値に設定する、
ことを特徴とする蓄電装置。 The power storage device according to claim 3,
The estimation unit includes
As the predetermined temperature is higher, the first weighting coefficient is set to a smaller value, and the second weighting coefficient is set to a larger value.
A power storage device. 請求項１に記載の蓄電装置であって、
前記推定部は、
前記所定期間における充電率が所定充電率より高い場合、前記第一の重み付け係数は現在設定されている値より小さい値に設定し、前記第二の重み付け係数は現在設定されている値より大きい値に設定する、
ことを特徴とする蓄電装置。 The power storage device according to claim 1,
The estimation unit includes
When the charging rate in the predetermined period is higher than the predetermined charging rate, the first weighting coefficient is set to a value smaller than the currently set value, and the second weighting coefficient is larger than the currently set value. Set to
A power storage device. 請求項５に記載の蓄電装置であって、
前記推定部は、
前記所定充電率が高いほど、前記第一の重み付け係数は小さい値に設定し、前記第二の重み付け係数は大きい値に設定する、
ことを特徴とする蓄電装置。
The power storage device according to claim 5,
The estimation unit includes
As the predetermined charging rate is higher, the first weighting coefficient is set to a smaller value, and the second weighting coefficient is set to a larger value.
A power storage device.
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