JP2012154839A - Life prediction evaluation device and life prediction evaluation method - Google Patents

Life prediction evaluation device and life prediction evaluation method Download PDF

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JP2012154839A
JP2012154839A JP2011015211A JP2011015211A JP2012154839A JP 2012154839 A JP2012154839 A JP 2012154839A JP 2011015211 A JP2011015211 A JP 2011015211A JP 2011015211 A JP2011015211 A JP 2011015211A JP 2012154839 A JP2012154839 A JP 2012154839A
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secondary battery
charge
life
battery
voltage value
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Makoto Kawano
誠 川野
Daisuke Yamazaki
大輔 山崎
Nobuhiro Tomosada
伸浩 友定
Tomomi Akutsu
智美 阿久津
Atsushi Kimura
篤史 木村
Soichiro Torai
総一朗 虎井
Tetsuo Yano
哲夫 矢野
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Yokogawa Electric 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
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    • Y02E60/10—Energy storage using batteries

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Abstract

PROBLEM TO BE SOLVED: To provide a life prediction evaluation device and a life prediction method of a secondary battery capable of quantitatively evaluating a life of a battery without performing a connection change even while the battery is in use.SOLUTION: In an evaluation device 2 for a battery to be tested 1, an electronic load/direct current power supply part 213 performs charging and discharging of the secondary battery to be evaluated, and voltage measuring means 212 measures the voltage value of the battery to be tested 1 after the lapse of a fixed time after discharging by the electronic load/direct current power supply part 213. Determination means 222 determines the remaining life of the battery to be tested 1 based on the measured voltage value by the voltage measuring means 212 and correlation data which indicates the correlation between the voltage, the number of charging/discharging cycles and the battery capacity of the secondary battery.

Description

本発明は、二次電池の寿命を予測する評価装置および評価方法に関し、とくに、電池の寿命を定量的に評価する二次電池の寿命予測評価装置等に関する。   The present invention relates to an evaluation device and an evaluation method for predicting the life of a secondary battery, and more particularly to a life prediction and evaluation device for a secondary battery that quantitatively evaluates the life of the battery.

従来の二次電池の余寿命を予測する手法として、例えば特許文献１には、被験電池を所定手順で満充電とし、一定時間経過したときに測定した端子電圧と、未劣化電池について同様の手順で電圧測定した端子電圧との電圧差、及び電池温度に基づいて被験電池の余寿命を求める手法が開示されている。実施例では、電圧差と電池温度からＡ〜Ｆの６段階の温度係数Ｋ（Ｋ＝Ａ〜Ｆ）を求め、式（残寿命[年]＝Ｋ×新品寿命[年]）に基づいて残りの寿命を計算している。   As a method for predicting the remaining life of a conventional secondary battery, for example, in Patent Document 1, a test battery is fully charged in a predetermined procedure, and a terminal voltage measured when a predetermined time has passed and a similar procedure for an undegraded battery Discloses a method for obtaining the remaining life of a test battery based on the voltage difference from the terminal voltage measured in step 1 and the battery temperature. In the embodiment, a temperature coefficient K in six stages of A to F (K = A to F) is obtained from the voltage difference and the battery temperature, and the remaining based on the formula (remaining life [year] = K × new life [year]). The lifespan is calculated.

特開２００９−８０１０４号公報JP 2009-80104 A

しかし、この手法は予め定められた温度係数に基づいた段階的な評価にしかならない。例えば、温度係数Ｂの中には、温度係数Ａに近い状態もあれば、温度係数Ｃに近い状態もある。温度係数Ａに近い温度係数Ｂと、温度係数Ｃに近い温度係数Ｂとでは、実使用時の電池性能として違いが出てくると考えられる。また、他の手法として内部インピーダンスを測定することにより余寿命を予測する方法が考えられるが、この方法では内部インピーダンス測定のために被験電池と装置とを接続する作業が必要となり、接続の切り替えのために被験電池によっては多大な検査コストがかかることが予測される。   However, this method is only a gradual evaluation based on a predetermined temperature coefficient. For example, some of the temperature coefficients B are close to the temperature coefficient A, and some are close to the temperature coefficient C. It is considered that there is a difference in battery performance during actual use between the temperature coefficient B close to the temperature coefficient A and the temperature coefficient B close to the temperature coefficient C. Another method is to estimate the remaining life by measuring the internal impedance, but this method requires work to connect the test battery and the device to measure the internal impedance. Therefore, it is predicted that a large inspection cost is required depending on the test battery.

本発明の目的は、複雑な作業を要することなく、電池の寿命を定量的に評価することができる二次電池の寿命予測評価装置および寿命予測方法を提供することにある。   The objective of this invention is providing the lifetime prediction evaluation apparatus and lifetime prediction method of a secondary battery which can evaluate the lifetime of a battery quantitatively, without requiring a complicated operation | work.

本発明の寿命予測評価装置は、二次電池の寿命を予測する寿命予測評価装置において、評価対象である二次電池の充放電を行う充放電手段と、前記充放電手段による放電後、一定時間経過後の前記二次電池の電圧値を測定する電圧測定手段と、前記電圧測定手段により得られる測定電圧値と、その測定電圧値と前記二次電池の余寿命との相関を示す相関データと、に基づいて、前記二次電池の余寿命を判定する判定手段と、を有することを特徴とする。
この寿命予測評価装置によれば、放電後一定時間経過後の電圧値と、二次電池の余寿命との相関を示す相関データに基づいて二次電池の余寿命を判定するので、煩雑な作業を要することなく、電池の寿命を定量的に評価することができる。 The life prediction / evaluation apparatus of the present invention is a life prediction / evaluation apparatus for predicting the life of a secondary battery, charging / discharging means for charging / discharging a secondary battery to be evaluated, and a predetermined time after discharge by the charge / discharge means. A voltage measuring means for measuring the voltage value of the secondary battery after elapse of time, a measured voltage value obtained by the voltage measuring means, and correlation data indicating a correlation between the measured voltage value and the remaining life of the secondary battery; And determining means for determining the remaining life of the secondary battery based on the above.
According to this life prediction / evaluation apparatus, the remaining life of the secondary battery is determined based on the correlation data indicating the correlation between the voltage value after the lapse of a certain time after the discharge and the remaining life of the secondary battery. Thus, the life of the battery can be quantitatively evaluated.

前記判定手段は、前記二次電池の充放電サイクル数と電圧値との相関を示す前記相関データとしての前記充放電サイクル−電圧特性を参照して、前記電圧測定手段により得られる測定電圧値に対応する充放電サイクル数を取得することにより、前記二次電池の余寿命を判定してもよい。   The determination means refers to the charge / discharge cycle-voltage characteristic as the correlation data indicating the correlation between the number of charge / discharge cycles of the secondary battery and the voltage value, and determines the measured voltage value obtained by the voltage measurement means. The remaining life of the secondary battery may be determined by obtaining the corresponding number of charge / discharge cycles.

前記判定手段は、前記充放電サイクル−電圧特性を参照して、前記電圧測定手段により得られる測定電圧値に対応する充放電サイクル数を取得し、さらに、前記二次電池の充放電サイクル数と電池容量との相関を示す前記相関データとしての充放電サイクル−電池容量特性を参照して、取得された前記充放電サイクル数に対応する電池容量を取得することにより、前記二次電池の余寿命を判定してもよい。   The determination means refers to the charge / discharge cycle-voltage characteristics, obtains the number of charge / discharge cycles corresponding to the measured voltage value obtained by the voltage measurement means, and further includes the number of charge / discharge cycles of the secondary battery. The remaining life of the secondary battery is obtained by obtaining the battery capacity corresponding to the obtained number of charge / discharge cycles with reference to the charge / discharge cycle-battery capacity characteristics as the correlation data indicating the correlation with the battery capacity. May be determined.

前記判定手段は、温度と電圧の相関関係に基づいて前記電圧測定手段による測定電圧値に対して温度補正を行い、補正後の電圧値に基づいて前記二次電池の余寿命を判定してもよい。   The determination unit may perform temperature correction on the voltage value measured by the voltage measurement unit based on a correlation between temperature and voltage, and may determine the remaining life of the secondary battery based on the corrected voltage value. Good.

前記判定手段は、温度が異なる複数の前記相関データのうち、評価時における温度に対応する相関データに基づいて、前記二次電池の余寿命を判定してもよい。   The determination unit may determine the remaining life of the secondary battery based on correlation data corresponding to the temperature at the time of evaluation among the plurality of correlation data having different temperatures.

前記判定手段は、充放電の際の電流値が異なる複数の前記相関データのうち、前記充放電手段による充放電の際の電流値に対応する相関データに基づいて、前記二次電池の余寿命を判定してもよい。   The determination means is based on correlation data corresponding to a current value at the time of charge / discharge by the charge / discharge means among a plurality of the correlation data having different current values at the time of charge / discharge. May be determined.

本発明の寿命予測評価方法は、二次電池の寿命を予測する寿命予測評価方法において、評価対象である二次電池の充放電を行う充放電工程と、前記充放電工程による放電後、一定時間経過後の前記二次電池の電圧値を測定する電圧測定工程と、前記電圧測定工程により得られる測定電圧値と、その測定電圧値と前記二次電池の余寿命との相関を示す相関データと、に基づいて、前記二次電池の余寿命を判定する判定工程と、を有することを特徴とする。
この寿命予測評価方法によれば、放電後一定時間経過後の電圧値と、二次電池の余寿命との相関を示す相関データに基づいて二次電池の余寿命を判定するので、煩雑な作業を要することなく、電池の寿命を定量的に評価することができる。 The life prediction evaluation method of the present invention is a life prediction evaluation method for predicting the life of a secondary battery, a charge / discharge process for charging / discharging a secondary battery to be evaluated, and a predetermined time after discharge by the charge / discharge process. A voltage measuring step for measuring the voltage value of the secondary battery after the elapse of time, a measured voltage value obtained by the voltage measuring step, and correlation data indicating a correlation between the measured voltage value and the remaining life of the secondary battery; And a determination step of determining the remaining life of the secondary battery based on the above.
According to this life prediction evaluation method, the remaining life of the secondary battery is determined based on the correlation data indicating the correlation between the voltage value after the lapse of a certain time after the discharge and the remaining life of the secondary battery. Thus, the life of the battery can be quantitatively evaluated.

本発明の寿命予測評価装置によれば、放電後一定時間経過後の電圧値と、二次電池の余寿命との相関を示す相関データに基づいて二次電池の余寿命を判定するので、煩雑な作業を要することなく、電池の寿命を定量的に評価することができる。   According to the life prediction / evaluation apparatus of the present invention, since the remaining life of the secondary battery is determined based on the correlation data indicating the correlation between the voltage value after the lapse of a certain time after the discharge and the remaining life of the secondary battery, Thus, it is possible to quantitatively evaluate the life of the battery without requiring an unnecessary work.

本発明の寿命予測評価方法によれば、放電後一定時間経過後の電圧値と、二次電池の余寿命との相関を示す相関データに基づいて二次電池の余寿命を判定するので、煩雑な作業を要することなく、電池の寿命を定量的に評価することができる。   According to the lifetime prediction evaluation method of the present invention, the remaining life of the secondary battery is determined based on the correlation data indicating the correlation between the voltage value after a lapse of a certain time after discharge and the remaining life of the secondary battery. Thus, it is possible to quantitatively evaluate the life of the battery without requiring an unnecessary work.

二次電池の寿命予測評価装置の構成を示すブロック図。The block diagram which shows the structure of the lifetime prediction evaluation apparatus of a secondary battery. 評価装置の動作を示すフローチャート。The flowchart which shows operation | movement of an evaluation apparatus. 充放電サイクル−電圧特性を示す図。The figure which shows charging / discharging cycle-voltage characteristic. 充放電サイクル−電池容量特性を示す図。The figure which shows a charging / discharging cycle-battery capacity characteristic.

以下、本発明による二次電池の寿命予測評価装置の一実施形態について説明する。   Hereinafter, an embodiment of a lifetime prediction / evaluation apparatus for a secondary battery according to the present invention will be described.

図１は、二次電池の寿命予測評価装置の構成を示すブロック図である。   FIG. 1 is a block diagram showing a configuration of a secondary battery lifetime prediction evaluation apparatus.

図１に示すように、本実施形態の二次電池の寿命予測評価装置としての評価装置２は、被試験電池１に対する充放電を制御する充放電制御部２１と、充放電制御部２１で得られた測定結果に基づいて被試験電池１の寿命予測評価を行う解析部２２と、を備える。   As shown in FIG. 1, an evaluation apparatus 2 as a secondary battery life prediction evaluation apparatus according to this embodiment is obtained by a charge / discharge control unit 21 that controls charge / discharge of a battery under test 1 and a charge / discharge control unit 21. And an analysis unit 22 that performs life prediction evaluation of the battery under test 1 based on the measured results.

充放電制御部２１は、電圧測定手段２１２および電子負荷／直流電源部２１３からデータを取得するデータ取得部２１１と、被試験電池１の電圧を測定する電圧測定手段２１２と、被試験電池１の充放電を行う充放電手段としての電子負荷／直流電源部２１３と、電圧測定手段２１２および電子負荷／直流電源部２１３の動作条件の設定および動作制御を行う試験設定／制御部２１４と、を備える。   The charge / discharge control unit 21 includes a voltage measurement unit 212 and a data acquisition unit 211 that acquires data from the electronic load / DC power supply unit 213, a voltage measurement unit 212 that measures the voltage of the battery under test 1, and the An electronic load / DC power supply unit 213 as charging / discharging means for performing charging / discharging, and a test setting / control unit 214 for setting operating conditions and controlling operation of the voltage measuring means 212 and the electronic load / DC power supply unit 213. .

また、解析部２２は、データ取得部２１１で取得されたデータに基づく演算を実行する演算部２２１と、演算部２２１における演算結果および予め記憶されている相関データに基づく寿命予測評価を行う判定手段２２２と、を備える。   The analysis unit 22 performs a calculation based on the data acquired by the data acquisition unit 211, and a determination unit that performs a life prediction evaluation based on a calculation result in the calculation unit 221 and correlation data stored in advance. 222.

以下、評価装置２の動作を説明する。   Hereinafter, the operation of the evaluation apparatus 2 will be described.

図２は、評価装置２の動作を示すフローチャートである。   FIG. 2 is a flowchart showing the operation of the evaluation apparatus 2.

寿命予測評価の工程では、まず、試験条件を設定する（ステップＳ１）。ここでは、試験設定／制御部２１４により電圧測定手段２１２と電子負荷／直流電源部２１３の動作を設定する。   In the life prediction evaluation process, first, test conditions are set (step S1). Here, the operation of the voltage measuring means 212 and the electronic load / DC power supply unit 213 is set by the test setting / control unit 214.

そして、ステップＳ１で設定した条件に基づいて、電子負荷／直流電源部２１３により被試験電池１の充放電を行い、下限電圧まで放電させる（ステップＳ２）。下限電圧は、例えば約３．０Ｖ乃至２．７Ｖ程度である。   Then, based on the conditions set in step S1, the electronic load / DC power supply unit 213 charges and discharges the battery under test 1 and discharges it to the lower limit voltage (step S2). The lower limit voltage is, for example, about 3.0V to 2.7V.

次に、電圧測定手段２１２により、ステップＳ２において放電完了から一定時間経過後の被試験電池１の電圧を測定する（ステップＳ３）。測定電圧値は、データ取得部２１１を介して解析部２２の演算部２１１へ送られる。後述する相関データに示されるように、被試験電池１が新しい場合（余寿命が長い）には放電完了後の電圧上昇はわずかであるが、被試験電池１が古い（余寿命が短い）ほど、放電完了後、電圧が下限電圧から徐々に増加する。   Next, the voltage measurement unit 212 measures the voltage of the battery under test 1 after a predetermined time has elapsed from the completion of discharge in step S2 (step S3). The measured voltage value is sent to the calculation unit 211 of the analysis unit 22 via the data acquisition unit 211. As shown in correlation data to be described later, when the battery under test 1 is new (the remaining life is long), the voltage rise after the completion of the discharge is slight, but as the battery under test 1 is older (the remaining life is short). After the discharge is completed, the voltage gradually increases from the lower limit voltage.

そして、演算部２２１は、記憶部（不図示）に予め記憶されている相関データを参照して測定電圧値に基づいて充放電サイクル数（回）と電池容量（ｍＡｈ）を取得する（ステップＳ４）。   Then, the calculation unit 221 acquires the number of charge / discharge cycles (times) and the battery capacity (mAh) based on the measured voltage value with reference to correlation data stored in advance in a storage unit (not shown) (step S4). ).

図３及び図４は、相関データを示す図である。図３は、相関データとしての充放電サイクル−電圧特性を示す図である。横軸に充放電サイクル数（回）、縦軸に電圧（Ｖ）を示す。図３に示すように、充放電サイクル数の増加に伴い放電完了後の電圧上昇幅が増大するため、測定される電圧が上昇する。   3 and 4 are diagrams showing correlation data. FIG. 3 is a diagram showing charge / discharge cycle-voltage characteristics as correlation data. The horizontal axis represents the number of charge / discharge cycles (times), and the vertical axis represents the voltage (V). As shown in FIG. 3, the voltage increase after the completion of the discharge increases with the increase in the number of charge / discharge cycles, and thus the measured voltage increases.

また、図４は、相関データとしての充放電サイクル−電池容量特性を示す図である。横軸に充放電サイクル数（回）、縦軸に電池容量（ｍＡｈ）を示す。図４に示すように、充放電サイクル数の増加に伴い、電池容量が低下する。   FIG. 4 is a diagram showing charge / discharge cycle-battery capacity characteristics as correlation data. The horizontal axis represents the number of charge / discharge cycles (times), and the vertical axis represents the battery capacity (mAh). As shown in FIG. 4, the battery capacity decreases as the number of charge / discharge cycles increases.

ステップＳ４では、図３の充放電サイクル−電圧特性を参照して測定電圧値に対応する充放電サイクル数（回）を取得する。さらに、図４の充放電サイクル−電池容量特性を参照して、図３の充放電サイクル−電圧特性から取得された充放電サイクル数（回）に対応する電池容量（ｍＡｈ）を取得する。このようにして、現在の状態として推定される充放電サイクル数および電池容量を求めることができる。   In step S4, the charge / discharge cycle number (times) corresponding to the measured voltage value is acquired with reference to the charge / discharge cycle-voltage characteristic of FIG. Furthermore, with reference to the charge / discharge cycle-battery capacity characteristic of FIG. 4, the battery capacity (mAh) corresponding to the number of charge / discharge cycles (times) acquired from the charge / discharge cycle-voltage characteristic of FIG. 3 is acquired. In this manner, the number of charge / discharge cycles estimated as the current state and the battery capacity can be obtained.

そして、取得した充放電サイクル数（回）と電池容量（ｍＡｈ）に基づいて判定手段２２２により被試験電池１の余寿命を判定して（ステップＳ５）、処理を終了する。   Then, based on the acquired number of charge / discharge cycles (times) and battery capacity (mAh), the determination means 222 determines the remaining life of the battery under test 1 (step S5), and the process is terminated.

例えば、被試験電池１の電池容量が、予め把握されている使用限界容量に低下するまでに、一定条件下で充放電サイクルを何サイクル実行できるかを余寿命とする。一定条件下とは、例えば、相関データを作成した際の温度、電流等の条件下である。   For example, the remaining life is defined as how many charge / discharge cycles can be executed under a certain condition before the battery capacity of the battery under test 1 is reduced to the use limit capacity grasped in advance. The constant conditions are, for example, conditions such as temperature and current when the correlation data is created.

このように、被試験電池１の放電完了から一定時間経過後の被試験電池１の電圧を測定し、相関データを参照して余寿命を予測することができる。被試験電池１が使用中であっても、接続の切り替えを行う必要なく、実使用下に近い状態で電池の寿命が残り何サイクルであるか定量的に評価することができる。本発明による寿命予測評価装置を、二次電池を使用する装置に内蔵することにより、二次電池の寿命を定期的ないし連続的に監視することも可能となる。   In this way, the remaining life can be predicted by measuring the voltage of the battery under test 1 after a predetermined time has elapsed from the completion of the discharge of the battery under test 1 and referring to the correlation data. Even when the battery under test 1 is in use, it is possible to quantitatively evaluate how many cycles the battery life is remaining in a state close to actual use without having to switch connections. By incorporating the life prediction / evaluation apparatus according to the present invention in an apparatus that uses a secondary battery, the life of the secondary battery can be monitored periodically or continuously.

温度と電圧に相関関係がある場合には、この相関関係を予め記憶しておき、電圧測定手段２１２による測定電圧値に対してその相関関係を用いて温度補正を行ってもよい。この手法によれば、相関データが作成されたときの温度と評価時の温度が異なる場合であっても、任意の温度での寿命評価が可能になる。   When there is a correlation between the temperature and the voltage, this correlation may be stored in advance, and the temperature correction may be performed on the voltage value measured by the voltage measuring unit 212 using the correlation. According to this method, even when the temperature when the correlation data is created and the temperature at the time of evaluation are different, the life evaluation at an arbitrary temperature can be performed.

また、異なる温度の下で作成された相関データを複数有することにより、様々な条件下における余寿命を算出することができる。例えば、評価時の温度と同じ温度の下で作成された相関データを利用すれば、正確な余寿命の判定が可能となる。同じ温度の下で作成された相関データがない場合には、上記温度補正の手法と組み合わせることもできる。   Moreover, the remaining lifetime under various conditions can be calculated by having a plurality of correlation data created under different temperatures. For example, if correlation data created at the same temperature as the temperature at the time of evaluation is used, accurate remaining life can be determined. If there is no correlation data created under the same temperature, it can be combined with the temperature correction method.

また、異なる充放電電流の下で作成された相関データを複数有することにより、様々な条件下における余寿命を算出することができる。例えば、電子負荷／直流電源部２１３から取得した充放電の際の電流値と同じ電流の下で作成された相関データを利用すればよい。   Moreover, the remaining life under various conditions can be calculated by having a plurality of correlation data created under different charge / discharge currents. For example, correlation data created under the same current as the current value at the time of charging / discharging acquired from the electronic load / DC power supply unit 213 may be used.

さらに、相関データとして図３に相当する充放電サイクル−電圧特性のみを用い、被試験電池１の測定電圧から求められる現在の充放電サイクル数のみに基づいて寿命評価を行ってもよい。この場合には、図４に相当する充放電サイクル−電池容量特性を用いることなく、簡易な手順で寿命を評価できる。   Furthermore, only the charge / discharge cycle-voltage characteristic corresponding to FIG. 3 may be used as the correlation data, and the life evaluation may be performed based only on the current number of charge / discharge cycles obtained from the measured voltage of the battery under test 1. In this case, the life can be evaluated by a simple procedure without using the charge / discharge cycle-battery capacity characteristics corresponding to FIG.

以上説明したように、本実施形態の評価装置２によれば、電子負荷／直流電源部２１３が評価対象である二次電池の充放電を行い、電圧測定手段２１２が電子負荷／直流電源部２１３による放電後、一定時間経過後の電圧値を測定し、判定手段２２２が電圧測定手段２１２による測定電圧値と、予め定められた二次電池の電圧と充放電サイクルと電池容量の相関データに基づいて、被試験電池１の余寿命を判定する。評価装置２を例えば二次電池を使用する装置に内蔵することにより、被試験電池１の使用中でも接続状態を変更することなく、実使用下に近い状態で電池の寿命を定期的あるいは連続的に定量的に評価することができる。   As described above, according to the evaluation apparatus 2 of the present embodiment, the electronic load / DC power supply unit 213 performs charging / discharging of the secondary battery to be evaluated, and the voltage measuring unit 212 is the electronic load / DC power supply unit 213. The voltage value after a predetermined time has elapsed after the discharge by the battery, and the determination means 222 is based on the measured voltage value by the voltage measurement means 212 and the correlation data of the predetermined secondary battery voltage, charge / discharge cycle and battery capacity. Thus, the remaining life of the battery under test 1 is determined. By incorporating the evaluation device 2 into, for example, a device that uses a secondary battery, the life of the battery is periodically or continuously maintained in a state close to actual use without changing the connection state even during use of the battery under test 1. It can be evaluated quantitatively.

本発明の適用範囲は上記実施形態に限定されることはない。本発明は、二次電池の寿命を定量的に評価する寿命予測評価装置等に対し、広く適用することができる。   The scope of application of the present invention is not limited to the above embodiment. The present invention can be widely applied to a lifetime prediction evaluation apparatus that quantitatively evaluates the lifetime of a secondary battery.

２１２ 電圧測定手段
２１３ 電子負荷／直流電源部（充放電手段）
２２２ 判定手段 212 Voltage measurement means 213 Electronic load / DC power supply (charge / discharge means)
222 Judgment means

Claims (7)

二次電池の寿命を予測する寿命予測評価装置において、
評価対象である二次電池の充放電を行う充放電手段と、
前記充放電手段による放電後、一定時間経過後の前記二次電池の電圧値を測定する電圧測定手段と、
前記電圧測定手段により得られる測定電圧値と、その測定電圧値と前記二次電池の余寿命との相関を示す相関データと、に基づいて、前記二次電池の余寿命を判定する判定手段と、
を有することを特徴とする寿命予測評価装置。 In a lifetime prediction evaluation apparatus that predicts the lifetime of a secondary battery,
Charging / discharging means for charging / discharging the secondary battery to be evaluated;
Voltage measuring means for measuring a voltage value of the secondary battery after a lapse of a certain time after discharging by the charging / discharging means;
Determining means for determining the remaining life of the secondary battery based on the measured voltage value obtained by the voltage measuring means and correlation data indicating the correlation between the measured voltage value and the remaining life of the secondary battery; ,
A life prediction and evaluation apparatus characterized by comprising: 前記判定手段は、前記二次電池の充放電サイクル数と電圧値との相関を示す前記相関データとしての前記充放電サイクル−電圧特性を参照して、前記電圧測定手段により得られる測定電圧値に対応する充放電サイクル数を取得することにより、前記二次電池の余寿命を判定することを特徴とする請求項１に記載の寿命予測評価装置。   The determination means refers to the charge / discharge cycle-voltage characteristic as the correlation data indicating the correlation between the number of charge / discharge cycles of the secondary battery and the voltage value, and determines the measured voltage value obtained by the voltage measurement means. The life prediction / evaluation apparatus according to claim 1, wherein the remaining life of the secondary battery is determined by acquiring a corresponding number of charge / discharge cycles. 前記判定手段は、前記充放電サイクル−電圧特性を参照して、前記電圧測定手段により得られる測定電圧値に対応する充放電サイクル数を取得し、さらに、前記二次電池の充放電サイクル数と電池容量との相関を示す前記相関データとしての充放電サイクル−電池容量特性を参照して、取得された前記充放電サイクル数に対応する電池容量を取得することにより、前記二次電池の余寿命を判定することを特徴とする請求項２に記載の寿命予測評価装置。   The determination means refers to the charge / discharge cycle-voltage characteristics, obtains the number of charge / discharge cycles corresponding to the measured voltage value obtained by the voltage measurement means, and further includes the number of charge / discharge cycles of the secondary battery. The remaining life of the secondary battery is obtained by obtaining the battery capacity corresponding to the obtained number of charge / discharge cycles with reference to the charge / discharge cycle-battery capacity characteristics as the correlation data indicating the correlation with the battery capacity. The life prediction / evaluation apparatus according to claim 2, wherein: 前記判定手段は、温度と電圧の相関関係に基づいて前記電圧測定手段による測定電圧値に対して温度補正を行い、補正後の電圧値に基づいて前記二次電池の余寿命を判定することを特徴とする請求項１〜３のいずれか１項に記載の寿命予測評価装置。   The determination means performs temperature correction on the measured voltage value by the voltage measurement means based on the correlation between temperature and voltage, and determines the remaining life of the secondary battery based on the corrected voltage value. The lifetime prediction evaluation apparatus according to any one of claims 1 to 3, wherein the lifetime prediction evaluation apparatus is characterized. 前記判定手段は、温度が異なる複数の前記相関データのうち、評価時における温度に対応する相関データに基づいて、前記二次電池の余寿命を判定することを特徴とする請求項１〜４のいずれか一項に記載の寿命予測評価装置。   The said determination means determines the remaining life of the said secondary battery based on the correlation data corresponding to the temperature at the time of evaluation among the said several correlation data from which temperature differs. The lifetime prediction evaluation apparatus as described in any one of Claims. 前記判定手段は、充放電の際の電流値が異なる複数の前記相関データのうち、前記充放電手段による充放電の際の電流値に対応する相関データに基づいて、前記二次電池の余寿命を判定することを特徴とする請求項１〜５のいずれか一項に記載の寿命予測評価装置。   The determination means is based on correlation data corresponding to a current value at the time of charge / discharge by the charge / discharge means among a plurality of the correlation data having different current values at the time of charge / discharge. The life prediction / evaluation apparatus according to any one of claims 1 to 5, wherein: 二次電池の寿命を予測する寿命予測評価方法において、
評価対象である二次電池の充放電を行う充放電工程と、
前記充放電工程による放電後、一定時間経過後の前記二次電池の電圧値を測定する電圧測定工程と、
前記電圧測定工程により得られる測定電圧値と、その測定電圧値と前記二次電池の余寿命との相関を示す相関データと、に基づいて、前記二次電池の余寿命を判定する判定工程と、
を有することを特徴とする寿命予測評価方法。 In the life prediction evaluation method for predicting the life of a secondary battery,
A charge / discharge process for charging / discharging the secondary battery to be evaluated; and
A voltage measuring step of measuring a voltage value of the secondary battery after a certain period of time after discharging by the charging and discharging step;
A determination step of determining the remaining life of the secondary battery based on the measured voltage value obtained by the voltage measurement step and correlation data indicating the correlation between the measured voltage value and the remaining life of the secondary battery; ,
The life prediction evaluation method characterized by having.
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