JP2010139304A - Method and device for evaluating capacitance of electric double layer capacitor - Google Patents

Method and device for evaluating capacitance of electric double layer capacitor Download PDF

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JP2010139304A
JP2010139304A JP2008314185A JP2008314185A JP2010139304A JP 2010139304 A JP2010139304 A JP 2010139304A JP 2008314185 A JP2008314185 A JP 2008314185A JP 2008314185 A JP2008314185 A JP 2008314185A JP 2010139304 A JP2010139304 A JP 2010139304A
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double layer
layer capacitor
electric double
capacitance
voltage
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JP5465870B2 (en
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Hironori Oba
裕規 大場
Ron Horikoshi
論 堀越
Shigeyuki Sugimoto
重幸 杉本
Kunihiro Sugihara
邦浩 杉原
Nobuyuki Yamamoto
信幸 山本
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Meidensha Corp
Chubu Electric Power Co Inc
Meidensha Electric Manufacturing Co Ltd
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Chubu Electric Power Co Inc
Meidensha Electric Manufacturing 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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Abstract

<P>PROBLEM TO BE SOLVED: To provide an evaluation method of a capacitance of an electric double layer capacitor and an evaluation device of the capacitance of the electric double layer capacitor capable of obtaining a capacitance having little fluctuation of the capacitance even in a high current density domain, and having extremely little current dependency. <P>SOLUTION: In this evaluation method of the capacitance of the electric double layer capacitor 6 for evaluating the capacitance of the electric double layer capacitor 6 by discharging the electric double layer capacitor 6 to a prescribed voltage with a constant current, after discharging the electric double layer capacitor 6 to the prescribed voltage, a discharge current is set at zero, and after setting the discharge current at zero, the capacitance of the electric double layer capacitor 6 is calculated by using a voltage of the electric double layer capacitor 6 after elapse of a fixed time. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、電気二重層キャパシタの静電容量の評価方法及び電気二重層キャパシタの静電容量の評価装置に関する。   The present invention relates to a method for evaluating the capacitance of an electric double layer capacitor and a device for evaluating the capacitance of an electric double layer capacitor.

現在、蓄電要素には、電気化学反応を利用した２次電池、イオン吸着を利用した電気二重層キャパシタ、誘電現象を利用したコンデンサー等がある。中でも電気二重層キャパシタは、２次電池と比べると、エネルギー密度は低いものの、重金属を含まないため環境負荷が少ない点や、メンテナンスフリーである点、寿命が長い点などが着目されており、鉛蓄電池の代替を視野に入れた高容量化の開発が進められている。   Currently, the storage element includes a secondary battery using an electrochemical reaction, an electric double layer capacitor using ion adsorption, a capacitor using a dielectric phenomenon, and the like. Among them, the electric double layer capacitor has a low energy density compared to the secondary battery, but it is not attracting attention because it does not contain heavy metals, has low environmental impact, is maintenance-free, and has a long life. Development of higher capacity is underway with a view to replacing storage batteries.

鉛蓄電池の場合、一般的な使用では、放電時間が１ｈ以上である。この鉛蓄電池の放電エネルギーを評価する場合、電池の特性は放電電流の依存性が大きいため、使用例と同じ放電条件で行う必要があり、長時間を要する。
一方、電気二重層キャパシタの放電エネルギーは静電容量と内部抵抗に支配されているため、これら２つの特性を把握することが重要となる。 In the case of a lead storage battery, the discharge time is 1 h or more in general use. When evaluating the discharge energy of this lead storage battery, since the battery characteristics are highly dependent on the discharge current, it is necessary to carry out under the same discharge conditions as in the use example, and it takes a long time.
On the other hand, since the discharge energy of the electric double layer capacitor is dominated by capacitance and internal resistance, it is important to grasp these two characteristics.

また、電気二重層キャパシタを鉛蓄電池の代替用途として長時間放電させて評価する場合、キャパシタの放電電流は微弱となるため内部抵抗による損失も無視することができる。したがって、長時間放電での電気二重層キャパシタの放電エネルギーは、静電容量のみで評価が可能である。また、従来の電気二重層キャパシタの静電容量の評価方法の一例が下記特許文献１に開示されている。   Further, when an electric double layer capacitor is evaluated by discharging for a long time as an alternative use of a lead storage battery, the discharge current of the capacitor becomes weak, so that the loss due to the internal resistance can be ignored. Therefore, the discharge energy of the electric double layer capacitor in the long-time discharge can be evaluated only by the capacitance. An example of a conventional method for evaluating the capacitance of an electric double layer capacitor is disclosed in Patent Document 1 below.

特開２００１−２５５３４５号公報JP 2001-255345 A

しかしながら、上述した従来の電気二重層キャパシタの静電容量の評価方法では、放電電流により静電容量が変化し、特に低温領域ではその依存性が著しく現れるため、鉛蓄電池と同様に使用例に合わせた長時間放電での評価が必要不可欠であるという問題があった。   However, in the above-described conventional method for evaluating the capacitance of an electric double layer capacitor, the capacitance changes depending on the discharge current, and its dependency is particularly pronounced in the low temperature region. There was a problem that evaluation with long discharge was indispensable.

以上のことから、本発明は、低電流放電時の静電容量や放電エネルギーを短い時間で評価することができる電気二重層キャパシタの静電容量の評価方法及び電気二重層キャパシタの静電容量の評価装置を提供することを目的とする。   From the above, the present invention provides a method for evaluating the capacitance of an electric double layer capacitor and the capacitance of the electric double layer capacitor that can evaluate the capacitance and discharge energy during low current discharge in a short time. An object is to provide an evaluation device.

上記の課題を解決する第１の発明に係る電気二重層キャパシタの静電容量の評価方法は、
定電流で所定の電圧まで電気二重層キャパシタを放電させて電気二重層キャパシタの静電容量を評価する電気二重層キャパシタの静電容量の評価方法において、
所定の電圧まで電気二重層キャパシタを放電させた後に放電電流を０とし、
放電電流を０とした後に一定時間経過時の電気二重層キャパシタの電圧を用い電気二重層キャパシタの静電容量を計算する
ことを特徴とする。 The method for evaluating the capacitance of the electric double layer capacitor according to the first invention for solving the above-described problems is as follows.
In the method for evaluating the capacitance of the electric double layer capacitor, the capacitance of the electric double layer capacitor is evaluated by discharging the electric double layer capacitor to a predetermined voltage with a constant current.
After discharging the electric double layer capacitor to a predetermined voltage, the discharge current is set to 0,
It is characterized in that the capacitance of the electric double layer capacitor is calculated using the voltage of the electric double layer capacitor after a predetermined time has elapsed after setting the discharge current to zero.

上記の課題を解決する第２の発明に係る電気二重層キャパシタの静電容量の評価方法は、
定電流で所定の電圧まで電気二重層キャパシタを放電させて電気二重層キャパシタの静電容量を評価する電気二重層キャパシタの静電容量の評価方法において、
所定の電圧まで電気二重層キャパシタを放電させた後に放電電流を０とし、
放電電流を０とした後に前回記録した電気二重層キャパシタの電圧と現在の電気二重層キャパシタの電圧を用いて電気二重層キャパシタの電圧の変動値を計算し、変動値が所定値以下となったときの電気二重層キャパシタの電圧を用いて電気二重層キャパシタの静電容量を計算する
ことを特徴とする。 The method for evaluating the capacitance of the electric double layer capacitor according to the second invention for solving the above-described problems is as follows.
In the method for evaluating the capacitance of the electric double layer capacitor, the capacitance of the electric double layer capacitor is evaluated by discharging the electric double layer capacitor to a predetermined voltage with a constant current.
After discharging the electric double layer capacitor to a predetermined voltage, the discharge current is set to 0,
The fluctuation value of the voltage of the electric double layer capacitor was calculated using the voltage of the electric double layer capacitor recorded last time after setting the discharge current to 0 and the current voltage of the electric double layer capacitor, and the fluctuation value became a predetermined value or less. The capacitance of the electric double layer capacitor is calculated using the voltage of the electric double layer capacitor.

上記の課題を解決する第３の発明に係る電気二重層キャパシタの静電容量の評価装置は、
定電流で所定の電圧まで電気二重層キャパシタを放電させる放電制御をし、電気二重層キャパシタの電圧及び放電電流を検出する充放電制御手段と、
放電電流を０とした後に一定時間経過時の電気二重層キャパシタの電圧を用い電気二重層キャパシタの静電容量を計算する計算手段と
を備える
ことを特徴とする。 An apparatus for evaluating the capacitance of an electric double layer capacitor according to a third invention for solving the above-mentioned problems is
Charge / discharge control means for discharging the electric double layer capacitor to a predetermined voltage with a constant current, and detecting the voltage and discharge current of the electric double layer capacitor;
And a calculating means for calculating the capacitance of the electric double layer capacitor by using the voltage of the electric double layer capacitor after a predetermined time has elapsed after setting the discharge current to zero.

上記の課題を解決する第４の発明に係る電気二重層キャパシタの静電容量の評価装置は、
定電流で所定の電圧まで電気二重層キャパシタを放電させる放電制御をし、電気二重層キャパシタの電圧及び放電電流を検出する充放電制御手段と、
検出した電気二重層キャパシタの電圧及び放電電流を記録する記録手段と、
放電電流を０とした後に記録手段に前回記録した電気二重層キャパシタの電圧と現在の電気二重層キャパシタの電圧を用いて電気二重層キャパシタの電圧の変動値を計算し、変動値が所定値以下となったときの電気二重層キャパシタの電圧を用いて電気二重層キャパシタの静電容量を計算する計算手段と
を備える
ことを特徴とする。 An apparatus for evaluating the capacitance of an electric double layer capacitor according to a fourth aspect of the present invention for solving the above-mentioned problem is as follows.
Charge / discharge control means for discharging the electric double layer capacitor to a predetermined voltage with a constant current, and detecting the voltage and discharge current of the electric double layer capacitor;
Recording means for recording the detected voltage and discharge current of the electric double layer capacitor;
Calculate the fluctuation value of the voltage of the electric double layer capacitor using the voltage of the electric double layer capacitor previously recorded in the recording means after setting the discharge current to 0 and the current voltage of the electric double layer capacitor, and the fluctuation value is below a predetermined value. And a calculating means for calculating the capacitance of the electric double layer capacitor using the voltage of the electric double layer capacitor.

本発明によれば、低電流放電時の静電容量や放電エネルギーを短い時間で評価することができる電気二重層キャパシタの静電容量の評価方法及び電気二重層キャパシタの静電容量の評価装置を提供することが可能となる。   According to the present invention, there is provided a method for evaluating the capacitance of an electric double layer capacitor and an apparatus for evaluating the capacitance of an electric double layer capacitor capable of evaluating the capacitance and discharge energy during low current discharge in a short time. It becomes possible to provide.

以下、本発明に係る電気二重層キャパシタの静電容量の評価方法及び電気二重層キャパシタの静電容量の評価装置の実施形態について、図を参照しながら説明する。   DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a method for evaluating the capacitance of an electric double layer capacitor and an apparatus for evaluating the capacitance of an electric double layer capacitor according to the present invention will be described with reference to the drawings.

電気二重層キャパシタは、一般的に、３０ｍＡ／ｃｍ2の放電電流で評価されており、その放電時間は３０秒程度である。一方、鉛蓄電池代替を視野に入れて放電時間を１ｈ以上とする場合の放電電流は、０．２５ｍＡ／ｃｍ2となる。そこで、通常の３０ｍＡ／ｃｍ2放電での試験から、低電流放電時の特性も把握できる電気二重層キャパシタの静電容量の評価方法及び電気二重層キャパシタの静電容量の評価装置について考案した。 The electric double layer capacitor is generally evaluated with a discharge current of 30 mA / cm 2 , and the discharge time is about 30 seconds. On the other hand, the discharge current is 0.25 mA / cm 2 when the discharge time is set to 1 h or longer with a view to replacing the lead storage battery. In view of this, a method for evaluating the capacitance of an electric double layer capacitor and a device for evaluating the capacitance of an electric double layer capacitor, which can grasp the characteristics at the time of low current discharge, from a test with a normal 30 mA / cm 2 discharge, were devised.

はじめに、本実施形態に係る電気二重層キャパシタの静電容量の評価装置について説明する。
図１は、本実施形態に係る電気二重層キャパシタの静電容量の評価装置の構成図である。
図１に示すように、本実施形態に係る電気二重層キャパシタの静電容量の評価装置１は、静電容量の評価対象である電気二重層キャパシタ６の充放電の制御を行う充放電制御装置２と、電気二重層キャパシタ６の静電容量の評価データを記録する記録部３と、電気二重層キャパシタ６の静電容量の評価のための計算を行う計算部４と、電気二重層キャパシタ６の静電容量の評価結果の表示を行う表示部５と、電気二重層キャパシタ６の静電容量の評価を行うための負荷７と、充放電制御装置２と負荷７とを接続又は非接続とするスイッチ８とにより構成されている。 First, the evaluation apparatus for the capacitance of the electric double layer capacitor according to the present embodiment will be described.
FIG. 1 is a configuration diagram of an apparatus for evaluating the capacitance of an electric double layer capacitor according to the present embodiment.
As shown in FIG. 1, a capacitance evaluation device 1 for an electric double layer capacitor according to this embodiment is a charge / discharge control device that controls charge / discharge of an electric double layer capacitor 6 that is a capacitance evaluation target. 2, a recording unit 3 that records evaluation data of the capacitance of the electric double layer capacitor 6, a calculation unit 4 that performs calculation for evaluating the capacitance of the electric double layer capacitor 6, and the electric double layer capacitor 6 The display unit 5 for displaying the evaluation results of the electrostatic capacity, the load 7 for evaluating the electrostatic capacity of the electric double layer capacitor 6, and the charge / discharge control device 2 and the load 7 are connected or disconnected. And a switch 8 that performs the above operation.

また、充放電制御装置２は、電気二重層キャパシタ６の電流を測定する電流測定端子２ａと、スイッチ８を制御するスイッチ制御信号端子２ｂと、充放電制御装置２に電気二重層キャパシタ６を接続し、電気二重層キャパシタ６の電圧を測定する電気二重層キャパシタ接続端子２ｃ，２ｄと、充放電制御装置２に負荷７を接続する負荷接続端子２ｅ，２ｆと、電気二重層キャパシタ６の電流値をデジタル値として出力する電流出力端子２ｇと、電気二重層キャパシタ６の電圧値をデジタル値として出力する電圧出力端子２ｈとを備えている。   The charge / discharge control device 2 connects the electric double layer capacitor 6 to the current measurement terminal 2a for measuring the current of the electric double layer capacitor 6, the switch control signal terminal 2b for controlling the switch 8, and the charge / discharge control device 2. The electric double layer capacitor connection terminals 2c and 2d for measuring the voltage of the electric double layer capacitor 6, the load connection terminals 2e and 2f for connecting the load 7 to the charge / discharge control device 2, and the current value of the electric double layer capacitor 6 Is output as a digital value, and a voltage output terminal 2h is provided that outputs the voltage value of the electric double layer capacitor 6 as a digital value.

ここで、上述した本実施形態に係る電気二重層キャパシタの静電容量の評価装置１において、パソコンを用いた場合の構成例について説明する。
図２は、本実施形態に係る電気二重層キャパシタの静電容量の評価装置においてパソコンを用いた場合の構成例を示した図である。 Here, the structural example at the time of using a personal computer is demonstrated in the electrostatic capacitance evaluation apparatus 1 of the electric double layer capacitor which concerns on this embodiment mentioned above.
FIG. 2 is a diagram showing a configuration example when a personal computer is used in the electrostatic double-layer capacitor electrostatic capacity evaluation apparatus according to the present embodiment.

図２に示すように、充放電制御装置２には、アナログ・デジタル変換器１０（以下、Ａ／Ｄ変換器という）を介してパソコン１１が接続されている。なお、上述したように、充放電制御装置２の電流出力端子及び電圧出力端子であるデータ出力端子１２の出力がデジタル出力である場合にはＡ／Ｄ変換器１０を介さずにパソコン１１を直接接続するようにすることも可能である。また、充放電制御装置２には、静電容量の評価対象である電気二重層キャパシタ６が接続されている。   As shown in FIG. 2, a personal computer 11 is connected to the charge / discharge control device 2 via an analog / digital converter 10 (hereinafter referred to as an A / D converter). As described above, when the output of the data output terminal 12 that is the current output terminal and the voltage output terminal of the charge / discharge control device 2 is a digital output, the personal computer 11 is directly connected without the A / D converter 10. It is also possible to connect them. The charge / discharge control device 2 is connected to an electric double layer capacitor 6 that is an object of electrostatic capacity evaluation.

なお、充放電制御装置２は、電気二重層キャパシタ接続端子１４を備えており、電気二重層キャパシタ接続端子１４と電気二重層キャパシタ６の正極端子６ａ及び負極端子６ｂとの間に、それぞれ電流出力用のケーブル１５と電圧検出用のケーブル１６が配線されている。   The charge / discharge control device 2 includes an electric double layer capacitor connection terminal 14, and current output is provided between the electric double layer capacitor connection terminal 14 and the positive electrode terminal 6 a and the negative electrode terminal 6 b of the electric double layer capacitor 6. Cable 15 for voltage and cable 16 for voltage detection are wired.

そして、電気二重層キャパシタの静電容量の評価装置１においてパソコン１１を用いた場合には、パソコン１１内部のハードディスクドライブや外部記憶装置を記録部３として用い、パソコン１１のＣＰＵを計算部４として用い、パソコン１１のモニタ１３を表示部５として用いるものとする。   When the personal computer 11 is used in the electrostatic capacity evaluation device 1 of the electric double layer capacitor, the hard disk drive or the external storage device inside the personal computer 11 is used as the recording unit 3, and the CPU of the personal computer 11 is used as the calculation unit 4. It is assumed that the monitor 13 of the personal computer 11 is used as the display unit 5.

次に、本発明の実施形態に係る電気二重層キャパシタの静電容量の評価方法について説明する。
ここで、まず、従来の電気二重層キャパシタの静電容量の一般的な算出方法について説明する。
図７は、従来の電気二重層キャパシタの静電容量の一般的な算出方法を示した図である。
図７に示すように、従来の電気二重層キャパシタ６の静電容量の一般的な算出方法は、放電時の電圧波形の直線が成り立つ部分である、図７中矢印Ａで示す直線部分の傾きを求める方法である。電気二重層キャパシタ６の放電波形と従来の電気二重層キャパシタ６の静電容量Ｃの一般的な算出方法を、下記式（１）に示す。なお、下記式（１）において、Ｉは放電電流、Ｖは電圧、ｔは時間を意味する。

Figure 2010139304
Next, a method for evaluating the capacitance of the electric double layer capacitor according to the embodiment of the present invention will be described.
Here, first, a general calculation method of the capacitance of the conventional electric double layer capacitor will be described.
FIG. 7 is a diagram showing a general method for calculating the capacitance of a conventional electric double layer capacitor.
As shown in FIG. 7, the general method for calculating the capacitance of the conventional electric double layer capacitor 6 is the portion where the straight line of the voltage waveform during discharge is established, the slope of the straight line portion indicated by arrow A in FIG. It is a method to ask for. A general calculation method of the discharge waveform of the electric double layer capacitor 6 and the capacitance C of the conventional electric double layer capacitor 6 is shown in the following formula (1). In the following formula (1), I means discharge current, V means voltage, and t means time.
Figure 2010139304

次に、本実施形態に係る電気二重層キャパシタの静電容量の評価方法について説明する。
本実施形態に係る静電容量の算出方法は、放電後の電圧挙動に着目したことを特徴としている。
図３は、本実施形態に係る電気二重層キャパシタの静電容量の評価方法を示した図である。
図３に示すように、電気二重層キャパシタ６は、放電電流Ｉを流して放電終了電圧ＶEに達したときに放電完了となる。その後、電気二重層キャパシタ６の端子間電圧は、内部抵抗のために放電できなかったエネルギーに応じて、電圧が徐々に復帰する。この復帰する速度は電極により異なるので、電圧の時間に対する変化量が一定基準以下となった時点、すなわち放電後に電圧が収束した時間ＴC時における電圧を収束電圧ＶLとし、この値を用いて下記式（２）から静電容量ＣＬを算出した。なお、下記式（２）において、ＴEは放電完了時間、Ｖ0は充電電圧を意味する。

Figure 2010139304
Next, a method for evaluating the capacitance of the electric double layer capacitor according to this embodiment will be described.
The capacitance calculation method according to the present embodiment is characterized by focusing on the voltage behavior after discharge.
FIG. 3 is a diagram showing a method for evaluating the capacitance of the electric double layer capacitor according to the present embodiment.
As shown in FIG. 3, an electric double layer capacitor 6 becomes a discharge complete when it reaches the discharge end voltage V E by applying a discharge current I. Thereafter, the voltage between the terminals of the electric double layer capacitor 6 gradually recovers according to the energy that could not be discharged due to the internal resistance. Since the return speed varies depending on the electrode, the voltage at the time when the change amount of the voltage with respect to time becomes below a certain reference, that is, at the time T C when the voltage converges after the discharge is defined as the convergence voltage V L, and this value is used. The capacitance CL was calculated from the following formula (2). In the following formula (2), T E means the discharge completion time, and V 0 means the charging voltage.
Figure 2010139304

また、電圧の時間に対する変化量の基準は２０μＶ／ｓｅｃとした。これは、この値以外でも静電容量の算出は可能であるが、これよりも大きな値では静電容量に電流依存性があらわれ、これよりも小さい値とすると電流依存性は小さくなる反面、評価時間が長くなってしまうためである。   The reference for the amount of change with respect to time of voltage was 20 μV / sec. Although it is possible to calculate the capacitance other than this value, if the value is larger than this value, the current dependency of the capacitance appears. If the value is smaller than this value, the current dependency becomes smaller. This is because the time becomes longer.

次に、本実施形態に係る電気二重層キャパシタの静電容量の評価方法の手順を説明する。
図４は、本実施形態に係る電気二重層キャパシタの静電容量の評価方法の手順を示したフローチャートである。
図４に示すように、はじめに、ステップＳ１において、計算部４（図１参照）は、電気二重層キャパシタ６の放電電流Ｉが０となった時点を放電完了とみなす。計算部４は、電気二重層キャパシタ６の放電電流Ｉが０となった場合、ステップＳ２を実行する。また、計算部４は、電気二重層キャパシタ６の放電電流Ｉが０となっていない場合、ステップＳ１を再度実行する。 Next, the procedure of the method for evaluating the capacitance of the electric double layer capacitor according to this embodiment will be described.
FIG. 4 is a flowchart showing the procedure of the method for evaluating the capacitance of the electric double layer capacitor according to this embodiment.
As shown in FIG. 4, first, in step S <b> 1, the calculation unit 4 (see FIG. 1) regards the time when the discharge current I of the electric double layer capacitor 6 becomes 0 as the completion of discharge. When the discharge current I of the electric double layer capacitor 6 becomes 0, the calculation unit 4 executes Step S2. Moreover, the calculation part 4 performs step S1 again, when the discharge current I of the electric double layer capacitor 6 is not zero.

次に、ステップＳ２において、計算部４は、記録部３（図１参照）に記録した放電後収束電圧ＶLの前回の記録値（ＶLn-1）と、放電後収束電圧ＶLの現在の値ＶLnの差分又は差分の充電電圧に対する比率を計算する。計算部４は、ステップＳ２の実行後、ステップＳ３を実行する。 Next, in step S2, calculating section 4, a recording unit 3 previous recorded values of the recorded discharge after the convergence voltage V L (see FIG. 1) (V Ln-1) , discharge after the convergence voltage V L of the current The difference of the value V Ln or the ratio of the difference to the charging voltage is calculated. The calculation part 4 performs step S3 after execution of step S2.

次に、ステップＳ３において、計算部４は、差分又は比率が所定値（Ｃｏｎｓｔ）より小さいかどうか判断する。計算部４は、差分又は比率が所定値（Ｃｏｎｓｔ）より小さい場合、ステップＳ４を実行する。また、計算部４は、差分又は比率が所定値（Ｃｏｎｓｔ）より小さくない場合、ステップＳ２を再度実行する。   Next, in step S3, the calculation unit 4 determines whether the difference or the ratio is smaller than a predetermined value (Const). When the difference or ratio is smaller than the predetermined value (Const), the calculation unit 4 executes Step S4. Moreover, the calculation part 4 performs step S2 again, when a difference or a ratio is not smaller than predetermined value (Const).

最後に、ステップＳ４において、計算部４は、上記式（２）により、静電容量ＣＬを計算する。
このように、本実施形態に係る電気二重層キャパシタの静電容量の評価方法においては、放電電流を０とした後、記録部３に記録した前回の電気二重層キャパシタ６の電圧と現在の電気二重層キャパシタ６の電圧を用いて電気二重層キャパシタ６の電圧の変動値を計算し、変動値が所定値以下となったときの電気二重層キャパシタ６の電圧を用いて電気二重層キャパシタ６の静電容量を計算するものとする。 Finally, in step S4, the calculation unit 4 calculates the capacitance CL by the above formula (2).
As described above, in the method for evaluating the capacitance of the electric double layer capacitor according to the present embodiment, the discharge current is set to 0 and then the previous voltage of the electric double layer capacitor 6 recorded in the recording unit 3 and the current electric current are recorded. The fluctuation value of the voltage of the electric double layer capacitor 6 is calculated using the voltage of the double layer capacitor 6, and the voltage of the electric double layer capacitor 6 when the fluctuation value becomes a predetermined value or less is calculated. The capacitance shall be calculated.

図５は、本実施形態に係る３０ｍＡ／ｃｍ2放電で得た静電容量及び従来の０．２５ｍＡ／ｃｍ2放電で得た静電容量の温度依存性を示した図である。
図５に示すように、本実施形態に係る静電容量の算出方法によれば、評価時間の短い３０ｍＡ／ｃｍ2放電でも、鉛蓄電池代替を視野に入れた長時間を要する０．２５ｍＡ／ｃｍ2放電で得た静電容量と同じ値が得られることが分かる。 Figure 5 is a graph showing the temperature dependency of the capacitance obtained by the capacitance and the conventional 0.25 mA / cm 2 discharge obtained in 30 mA / cm 2 discharge according to the present embodiment.
As shown in FIG. 5, according to the capacitance calculation method according to the present embodiment, even with 30 mA / cm 2 discharge having a short evaluation time, 0.25 mA / cm that requires a long time with a view to replacing lead-acid batteries is required. It can be seen that the same value as the capacitance obtained by two discharges can be obtained.

図６は、本実施形態に係る静電容量の算出方法と他の静電容量の算出方法の電流密度依存性を示した図である。なお、図６中、Ｃは放電後半８０％の電圧曲線を直線回帰した結果、Ｃ’は放電終了から５秒後の電圧から算出した結果、ＣＳは放電中の電圧曲線の直線部分を回帰した結果、ＣＬは本実施形態に係る放電終了後に復帰する電圧の収束値から算出した結果、ＣＥは実測の放電エネルギー及び放電時間から算出した結果を示している。   FIG. 6 is a diagram showing the current density dependency of the capacitance calculation method according to the present embodiment and other capacitance calculation methods. In FIG. 6, C is a result of linear regression of the voltage curve of the latter half of the discharge 80%, C ′ is a result of calculation from a voltage 5 seconds after the end of discharge, and CS is a regression of the linear part of the voltage curve during discharge. As a result, CL represents the result calculated from the convergence value of the voltage recovered after the discharge according to the present embodiment, and CE represents the result calculated from the actually measured discharge energy and discharge time.

図６に示すように、これらの挙動を比較すると、静電容量ＣＬは放電電流の依存性が極めて小さいことが分かる。この静電容量ＣＬであれば、短時間で評価可能な高電流放電の結果から、長時間を要する低電流放電時の静電容量を推測することが可能である。   As shown in FIG. 6, comparing these behaviors, it can be seen that the capacitance CL has a very small dependence on the discharge current. With this capacitance CL, it is possible to estimate the capacitance at the time of low current discharge that requires a long time from the result of high current discharge that can be evaluated in a short time.

以上のように、本発明に係る電気二重層キャパシタの静電容量の評価方法及び電気二重層キャパシタの静電容量の評価装置によれば、電気二重層キャパシタ６の静電容量を、放電終了後の収束した電圧から算出することにより、放電電流や温度に依存しない電気二重層キャパシタ６の静電容量を把握することができる。
これにより、従来は長時間を要した低電流放電時の静電容量や放電エネルギーを短い時間、例えば、従来に比べ１／１０以下の時間で評価することができる。 As described above, according to the method for evaluating the capacitance of the electric double layer capacitor and the device for evaluating the capacitance of the electric double layer capacitor according to the present invention, the capacitance of the electric double layer capacitor 6 is changed after the discharge is completed. By calculating from the converged voltage, it is possible to grasp the capacitance of the electric double layer capacitor 6 independent of the discharge current and temperature.
Thereby, the electrostatic capacity and discharge energy at the time of low current discharge which conventionally required a long time can be evaluated in a short time, for example, 1/10 or less of the conventional time.

本発明は、例えば、電気二重層キャパシタの静電容量の評価方法及び電気二重層キャパシタの静電容量の評価装置に利用することが可能である。   The present invention can be used, for example, in a method for evaluating the capacitance of an electric double layer capacitor and a device for evaluating the capacitance of an electric double layer capacitor.

本実施形態に係る電気二重層キャパシタの静電容量の評価装置の構成図である。It is a block diagram of the evaluation apparatus of the electrostatic capacitance of the electric double layer capacitor concerning this embodiment. 本実施形態に係る電気二重層キャパシタの静電容量の評価装置においてパソコンを用いた場合の構成例を示した図である。It is the figure which showed the example of a structure at the time of using a personal computer in the electrostatic capacitance evaluation apparatus of the electric double layer capacitor concerning this embodiment. 本実施形態に係る電気二重層キャパシタの静電容量の評価方法を示した図である。It is the figure which showed the evaluation method of the electrostatic capacitance of the electric double layer capacitor which concerns on this embodiment. 本実施形態に係る電気二重層キャパシタの静電容量の評価方法の手順を示したフローチャートである。It is the flowchart which showed the procedure of the evaluation method of the electrostatic capacitance of the electric double layer capacitor which concerns on this embodiment. 本実施形態に係る３０ｍＡ／ｃｍ2放電で得た静電容量及び従来の０．２５ｍＡ／ｃｍ2放電で得た静電容量の温度依存性を示した図である。Is a diagram showing temperature dependency of the capacitance obtained by the capacitance and the conventional 0.25 mA / cm 2 discharge obtained in 30 mA / cm 2 discharge according to the present embodiment. 本実施形態に係る静電容量の算出方法と他の静電容量の算出方法の電流密度依存性を示した図である。It is the figure which showed the current density dependence of the calculation method of the electrostatic capacitance which concerns on this embodiment, and the calculation method of another electrostatic capacitance. 従来の電気二重層キャパシタの静電容量の一般的な算出方法を示した図である。It is the figure which showed the general calculation method of the electrostatic capacitance of the conventional electric double layer capacitor.

符号の説明Explanation of symbols

１ 電気二重層キャパシタの静電容量の評価装置
２ 充放電制御装置
３ 記録部
４ 計算部
５ 表示部
６ 電気二重層キャパシタ
７ 負荷
８ スイッチ
１０ アナログ・デジタル変換器
１１ パソコン
１２ データ出力端子
１３ モニタ
１４ 電気二重層キャパシタ接続端子
１５ 電流出力用のケーブル
１６ 電圧検出用のケーブル DESCRIPTION OF SYMBOLS 1 Capacitance evaluation apparatus 2 of electric double layer capacitor 2 Charging / discharging control apparatus 3 Recording part 4 Calculation part 5 Display part 6 Electric double layer capacitor 7 Load 8 Switch 10 Analog / digital converter 11 Personal computer 12 Data output terminal 13 Monitor 14 Electric double layer capacitor connection terminal 15 Current output cable 16 Voltage detection cable

Claims (4)

定電流で所定の電圧まで電気二重層キャパシタを放電させて電気二重層キャパシタの静電容量を評価する電気二重層キャパシタの静電容量の評価方法において、
所定の電圧まで電気二重層キャパシタを放電させた後に放電電流を０とし、
放電電流を０とした後に一定時間経過時の電気二重層キャパシタの電圧を用い電気二重層キャパシタの静電容量を計算する
ことを特徴とする電気二重層キャパシタの静電容量の評価方法。 In the method for evaluating the capacitance of the electric double layer capacitor, the capacitance of the electric double layer capacitor is evaluated by discharging the electric double layer capacitor to a predetermined voltage with a constant current.
After discharging the electric double layer capacitor to a predetermined voltage, the discharge current is set to 0,
A method for evaluating the capacitance of an electric double layer capacitor, wherein the capacitance of the electric double layer capacitor is calculated using the voltage of the electric double layer capacitor after a predetermined time has elapsed after setting the discharge current to zero. 定電流で所定の電圧まで電気二重層キャパシタを放電させて電気二重層キャパシタの静電容量を評価する電気二重層キャパシタの静電容量の評価方法において、
所定の電圧まで電気二重層キャパシタを放電させた後に放電電流を０とし、
放電電流を０とした後に前回記録した電気二重層キャパシタの電圧と現在の電気二重層キャパシタの電圧を用いて電気二重層キャパシタの電圧の変動値を計算し、変動値が所定値以下となったときの電気二重層キャパシタの電圧を用いて電気二重層キャパシタの静電容量を計算する
ことを特徴とする電気二重層キャパシタの静電容量の評価方法。 In the method for evaluating the capacitance of the electric double layer capacitor, the capacitance of the electric double layer capacitor is evaluated by discharging the electric double layer capacitor to a predetermined voltage with a constant current.
After discharging the electric double layer capacitor to a predetermined voltage, the discharge current is set to 0,
The fluctuation value of the voltage of the electric double layer capacitor was calculated using the voltage of the electric double layer capacitor recorded last time after setting the discharge current to 0 and the current voltage of the electric double layer capacitor, and the fluctuation value became a predetermined value or less. A method for evaluating the capacitance of an electric double layer capacitor, comprising calculating the capacitance of the electric double layer capacitor using the voltage of the electric double layer capacitor. 定電流で所定の電圧まで電気二重層キャパシタを放電させる放電制御をし、電気二重層キャパシタの電圧及び放電電流を検出する充放電制御手段と、
放電電流を０とした後に一定時間経過時の電気二重層キャパシタの電圧を用い電気二重層キャパシタの静電容量を計算する計算手段と
を備える
ことを特徴とする電気二重層キャパシタの静電容量の評価装置。 Charge / discharge control means for discharging the electric double layer capacitor to a predetermined voltage with a constant current, and detecting the voltage and discharge current of the electric double layer capacitor;
And a calculating means for calculating the capacitance of the electric double layer capacitor by using the voltage of the electric double layer capacitor after a predetermined time has elapsed after setting the discharge current to zero. Evaluation device. 定電流で所定の電圧まで電気二重層キャパシタを放電させる放電制御をし、電気二重層キャパシタの電圧及び放電電流を検出する充放電制御手段と、
検出した電気二重層キャパシタの電圧及び放電電流を記録する記録手段と、
放電電流を０とした後に記録手段に前回記録した電気二重層キャパシタの電圧と現在の電気二重層キャパシタの電圧を用いて電気二重層キャパシタの電圧の変動値を計算し、変動値が所定値以下となったときの電気二重層キャパシタの電圧を用いて電気二重層キャパシタの静電容量を計算する計算手段と
を備える
ことを特徴とする電気二重層キャパシタの静電容量の評価装置。 Charge / discharge control means for discharging the electric double layer capacitor to a predetermined voltage with a constant current, and detecting the voltage and discharge current of the electric double layer capacitor;
Recording means for recording the detected voltage and discharge current of the electric double layer capacitor;
Calculate the fluctuation value of the voltage of the electric double layer capacitor using the voltage of the electric double layer capacitor previously recorded in the recording means after setting the discharge current to 0 and the current voltage of the electric double layer capacitor, and the fluctuation value is below a predetermined value. And a calculating means for calculating the capacitance of the electric double layer capacitor using the voltage of the electric double layer capacitor.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001297954A (en) * 2000-04-11 2001-10-26 Honda Motor Co Ltd Device for detecting deterioration of electric double- layer capacitor
JP2005300500A (en) * 2004-04-16 2005-10-27 Nissan Motor Co Ltd Characteristic evaluating method and characteristic evaluating apparatus for electric double-layer capacitor
JP2006343165A (en) * 2005-06-08 2006-12-21 Hioki Ee Corp Apparatus for measuring resistance of battery
JP2008066390A (en) * 2006-09-05 2008-03-21 Power System:Kk Method and device for measuring and inspecting capacitor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001297954A (en) * 2000-04-11 2001-10-26 Honda Motor Co Ltd Device for detecting deterioration of electric double- layer capacitor
JP2005300500A (en) * 2004-04-16 2005-10-27 Nissan Motor Co Ltd Characteristic evaluating method and characteristic evaluating apparatus for electric double-layer capacitor
JP2006343165A (en) * 2005-06-08 2006-12-21 Hioki Ee Corp Apparatus for measuring resistance of battery
JP2008066390A (en) * 2006-09-05 2008-03-21 Power System:Kk Method and device for measuring and inspecting capacitor

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