JP6156035B2 - Storage module abnormality detection method and abnormality detection apparatus - Google Patents

Storage module abnormality detection method and abnormality detection apparatus Download PDF

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JP6156035B2
JP6156035B2 JP2013206453A JP2013206453A JP6156035B2 JP 6156035 B2 JP6156035 B2 JP 6156035B2 JP 2013206453 A JP2013206453 A JP 2013206453A JP 2013206453 A JP2013206453 A JP 2013206453A JP 6156035 B2 JP6156035 B2 JP 6156035B2
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resistance value
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俊雄 小田切
俊雄 小田切
英明 篠田
英明 篠田
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Toyota Industries Corp
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Description

本発明は、蓄電モジュールの異常検出方法及び異常検出装置に関する。   The present invention relates to a storage module abnormality detection method and abnormality detection apparatus.

自動車、産業車両等の車両に搭載される蓄電モジュールは、大きな容量が必要となるため、複数の蓄電装置同士をバスバーで接続することによって構成されている。このような蓄電モジュールでは、充放電回数の増加に応じて抵抗が増加していくことで、蓄電モジュールの発熱及び容量低下等が生じることがある。このため、従来では、蓄電モジュールの抵抗を検出し、検出結果を利用して蓄電モジュールの状態を判定する技術が存在している（例えば特許文献１及び２参照）。   A power storage module mounted on a vehicle such as an automobile or an industrial vehicle requires a large capacity, and is configured by connecting a plurality of power storage devices with a bus bar. In such a power storage module, the resistance increases as the number of times of charging / discharging increases, so that the heat generation and capacity reduction of the power storage module may occur. For this reason, conventionally, there is a technique for detecting the resistance of the power storage module and determining the state of the power storage module using the detection result (see, for example, Patent Documents 1 and 2).

特開２０１１−２２０６９５号公報JP 2011-220695 A 特開２０１３−９６７５２号公報JP 2013-96752 A

車載の蓄電モジュールの抵抗が増加することによる異常の原因としては、例えば蓄電装置の電極の劣化が挙げられる。しかしながら、蓄電モジュールの異常の原因としては、電極の劣化以外にも、蓄電装置同士を接続するバスバーと蓄電装置の端子との間の接続異常が挙げられる。   As a cause of abnormality due to an increase in resistance of an on-vehicle power storage module, for example, deterioration of an electrode of a power storage device can be cited. However, the cause of the abnormality of the power storage module includes a connection abnormality between the bus bar connecting the power storage devices and the terminals of the power storage device, in addition to the deterioration of the electrodes.

これに対し、従来の蓄電モジュールの異常検出方法では、蓄電装置の電極の劣化による蓄電モジュールの抵抗の増加と、バスバーの接続異常による蓄電モジュールの抵抗の増加とを判別することは困難であった。   On the other hand, in the conventional abnormality detection method of the power storage module, it is difficult to determine the increase in the resistance of the power storage module due to the deterioration of the electrode of the power storage device and the increase in the resistance of the power storage module due to the abnormal connection of the bus bar. .

本発明は、上記課題を解決するためになされたものであり、電極の劣化と切り分けてバスバーの接続異常の有無を判別できる蓄電モジュール異常検出装置及び蓄電モジュール異常検出方法を提供することを目的とする。   The present invention has been made to solve the above-described problem, and an object of the present invention is to provide a storage module abnormality detection device and a storage module abnormality detection method capable of determining the presence or absence of a connection abnormality of a bus bar by separating from electrode deterioration. To do.

上記課題の解決のため、本発明に係る蓄電モジュールの異常検出方法は、蓄電装置同士をバスバーで接続してなる蓄電モジュールにおけるバスバーの接続異常を検出するものであって、定電流充電を実施しながら蓄電モジュールの抵抗値を検出する抵抗値検出工程と、抵抗値検出工程で得られた抵抗値のうち、定電流充電を開始した直後の瞬間抵抗値と、定電流充電を開始してから一定時間が経過した後の拡散抵抗値とを抽出し、瞬間抵抗値と拡散抵抗値との比を所定の閾値と比較してバスバーの接続異常の有無を判定する判定工程と、を備えたことを特徴としている。   In order to solve the above problems, an abnormality detection method for a power storage module according to the present invention detects a connection abnormality of a bus bar in a power storage module formed by connecting power storage devices to each other by a bus bar, and performs constant current charging. While the resistance value detection process detects the resistance value of the power storage module, and the resistance value obtained in the resistance value detection process, the instantaneous resistance value immediately after starting constant current charging, and constant after starting constant current charging And a determination step of extracting a diffusion resistance value after a lapse of time and comparing the ratio between the instantaneous resistance value and the diffusion resistance value with a predetermined threshold to determine whether or not there is a connection abnormality of the bus bar. It is a feature.

この蓄電モジュールの異常検出方法では、定電流充電中に抽出した瞬間抵抗値と拡散抵抗値との比を所定の閾値と比較することで、バスバーの接続異常の有無を判定する。ここで、蓄電装置内の電極の劣化が生じた場合、正常時と比較して瞬間抵抗値及び拡散抵抗値の何れもが上昇する傾向がある。一方、バスバーに接続異常が生じた場合、正常時と比較して瞬間抵抗値は上昇するが、拡散抵抗値は上昇しない傾向がある。したがって、瞬間抵抗値と拡散抵抗値との比を閾値と比較することにより、電極の劣化と切り分けてバスバーの接続異常を判別することができる。   In this storage module abnormality detection method, the presence / absence of a bus bar connection abnormality is determined by comparing the ratio between the instantaneous resistance value and the diffusion resistance value extracted during constant current charging with a predetermined threshold value. Here, when deterioration of the electrode in the power storage device occurs, both the instantaneous resistance value and the diffusion resistance value tend to increase as compared with the normal time. On the other hand, when a connection abnormality occurs in the bus bar, the instantaneous resistance value increases compared to the normal state, but the diffusion resistance value tends not to increase. Therefore, by comparing the ratio between the instantaneous resistance value and the diffused resistance value with the threshold value, it is possible to discriminate the bus bar connection abnormality from the deterioration of the electrode.

また、抵抗値検出工程において、各蓄電装置のバスバー間の抵抗値をそれぞれ検出することが好ましい。これにより、各蓄電装置に接続するバスバー毎の接続異常の有無を判定することができる。   In the resistance value detection step, it is preferable to detect the resistance value between the bus bars of each power storage device. Thereby, the presence or absence of a connection abnormality for each bus bar connected to each power storage device can be determined.

また、本発明に係る蓄電モジュールの異常検出装置は、蓄電装置同士をバスバーで接続してなる蓄電モジュールにおける前記バスバーの接続異常を検出するものであって、蓄電モジュールの定電流充電が実施されたときに蓄電モジュールの抵抗値を検出する抵抗値検出部と、抵抗値検出工程で得られた抵抗値のうち、定電流充電を開始した直後の瞬間抵抗値と、定電流充電を開始してから一定時間が経過した後の拡散抵抗値とを抽出し、瞬間抵抗値と拡散抵抗値との比を所定の閾値と比較してバスバーの接続異常の有無を判定する判定部と、を備えたことを特徴とする。   The abnormality detection device for a power storage module according to the present invention detects a connection abnormality of the bus bar in a power storage module formed by connecting power storage devices to each other by a bus bar, and constant current charging of the power storage module was performed. Sometimes, the resistance value detection unit that detects the resistance value of the power storage module, the resistance value obtained in the resistance value detection step, the instantaneous resistance value immediately after starting constant current charging, and after starting constant current charging And a determination unit that extracts a diffusion resistance value after a predetermined time has elapsed and compares the instantaneous resistance value and the diffusion resistance value with a predetermined threshold value to determine whether there is a busbar connection abnormality. It is characterized by.

この蓄電モジュールの異常検出装置では、判定部が、定電流充電中に抽出した瞬間抵抗値と拡散抵抗値との比を所定の閾値と比較し、バスバーの接続異常の有無を判定する。ここで、蓄電装置内の電極の劣化が生じた場合、正常時と比較して瞬間抵抗値及び拡散抵抗値の何れもが上昇する傾向がある。一方、バスバーの接続異常が生じた場合、正常時と比較して瞬間抵抗値は上昇するが、拡散抵抗値は上昇しない傾向がある。したがって、瞬間抵抗値と拡散抵抗値との比を閾値と比較することで、電極の劣化と切り分けてバスバーの接続異常を判別することができる。   In this storage module abnormality detection apparatus, the determination unit compares the ratio of the instantaneous resistance value and the diffusion resistance value extracted during constant current charging with a predetermined threshold value, and determines the presence or absence of a bus bar connection abnormality. Here, when deterioration of the electrode in the power storage device occurs, both the instantaneous resistance value and the diffusion resistance value tend to increase as compared with the normal time. On the other hand, when a bus bar connection abnormality occurs, the instantaneous resistance value increases compared to the normal state, but the diffusion resistance value tends not to increase. Therefore, by comparing the ratio between the instantaneous resistance value and the diffused resistance value with the threshold value, it is possible to discriminate the abnormality in the connection of the bus bar from the deterioration of the electrode.

また、抵抗値検出部は、各蓄電装置の抵抗値をそれぞれ検出することが好ましい。これにより、各蓄電装置に接続するバスバー毎の接続異常の有無を判定することができる。   Moreover, it is preferable that a resistance value detection part each detects the resistance value of each electrical storage apparatus. Thereby, the presence or absence of a connection abnormality for each bus bar connected to each power storage device can be determined.

本発明に係る蓄電モジュールの異常検出方法及び蓄電モジュールの異常検出装置によれば、バスバーの接続異常の有無を判別できる。   According to the storage module abnormality detection method and the storage module abnormality detection apparatus according to the present invention, it is possible to determine the presence or absence of a bus bar connection abnormality.

本発明の一実施形態に係る異常検出装置を示す概略構成図である。It is a schematic block diagram which shows the abnormality detection apparatus which concerns on one Embodiment of this invention. 図１に示した異常検出装置を用いて実施される蓄電モジュールの異常検出方法の一例を示すフローチャートである。It is a flowchart which shows an example of the abnormality detection method of the electrical storage module implemented using the abnormality detection apparatus shown in FIG. 抵抗値検出部で検出されるデータの一例を示す図である。It is a figure which shows an example of the data detected by a resistance value detection part.

以下、図面を参照しながら、本発明に係る蓄電モジュールの異常検出方法及び蓄電モジュールの異常検出装置の好適な実施形態について詳細に説明する。   Hereinafter, preferred embodiments of a storage module abnormality detection method and a storage module abnormality detection device according to the present invention will be described in detail with reference to the drawings.

図１は、本実施形態に係る異常検出装置、蓄電モジュール及び充電器を示す概略構成図である。図１に示すように、蓄電モジュール１は、複数の蓄電装置１１と、蓄電装置１１同士を直列に接続するためのバスバー１２とを備えている。蓄電装置１１は、例えばリチウムイオン二次電池である。蓄電装置１１は、例えば電解液が充填された筐体内に負極とセパレータ内に配置した正極とを積層してなる電極組立体を収容することによって構成されている。   FIG. 1 is a schematic configuration diagram illustrating an abnormality detection device, a power storage module, and a charger according to the present embodiment. As shown in FIG. 1, the power storage module 1 includes a plurality of power storage devices 11 and a bus bar 12 for connecting the power storage devices 11 in series. The power storage device 11 is, for example, a lithium ion secondary battery. The power storage device 11 is configured, for example, by housing an electrode assembly in which a negative electrode and a positive electrode disposed in a separator are stacked in a casing filled with an electrolytic solution.

充電器２は、蓄電モジュール１の充電を行うために電力を供給する装置である。充電器２は、蓄電モジュール１が接続された場合に、充電開始時から一定の期間において蓄電モジュール１の定電流充電を行う。   The charger 2 is a device that supplies electric power to charge the power storage module 1. When the power storage module 1 is connected, the charger 2 performs constant current charging of the power storage module 1 for a certain period from the start of charging.

異常検出装置３は、蓄電モジュール１の異常を検出する装置である。この異常検出装置３は、図１に示すように、例えば抵抗値検出部２１と、判定部２２とを備え、電極の劣化と切り分けてバスバーの接続異常の有無を判別可能に構成されている。   The abnormality detection device 3 is a device that detects an abnormality of the power storage module 1. As shown in FIG. 1, the abnormality detection device 3 includes, for example, a resistance value detection unit 21 and a determination unit 22, and is configured to be able to determine the presence or absence of a bus bar connection abnormality by separating it from electrode deterioration.

抵抗値検出部２１は、蓄電モジュール１に対する定電流充電の実施中に蓄電モジュール１の抵抗値を検出する部分である。抵抗値検出部２１は、蓄電モジュール１に印加される電圧値から、定電流充電時に蓄電モジュール１に流れる電流値を除算して蓄電モジュール１の抵抗値を算出し、算出結果を判定部２２に出力する。図１においては、抵抗値検出部２１は、バスバー１２に接続された電圧計４から電圧値を取得しこの電圧値と定電流充電時に蓄電モジュール１に流れる電流値とに基づいて蓄電装置１１の抵抗値を算出する。なお、抵抗値検出部２１で取得される抵抗値には、蓄電装置１１の内部抵抗値と、バスバー１２と蓄電装置１１との間の接触抵抗値の双方が含まれる。   The resistance value detection unit 21 is a part that detects the resistance value of the power storage module 1 during the constant current charging of the power storage module 1. The resistance value detection unit 21 calculates the resistance value of the power storage module 1 by dividing the current value flowing through the power storage module 1 during constant current charging from the voltage value applied to the power storage module 1, and the calculation result is sent to the determination unit 22. Output. In FIG. 1, the resistance value detection unit 21 obtains a voltage value from the voltmeter 4 connected to the bus bar 12, and based on this voltage value and the current value flowing through the power storage module 1 during constant current charging, Calculate the resistance value. The resistance value acquired by the resistance value detection unit 21 includes both the internal resistance value of the power storage device 11 and the contact resistance value between the bus bar 12 and the power storage device 11.

判定部２２は、抵抗値検出部２１から取得した抵抗値の算出結果に基づいて、蓄電モジュール１の異常の有無を判定する部分である。より具体的には、判定部２２は、抵抗値検出部２１から取得した抵抗値から、定電流充電を開始した直後の瞬間抵抗値と、瞬間抵抗値の検出後から一定時間が経過する間の拡散抵抗値とをそれぞれ抽出する。判定部２２は、抽出した瞬間抵抗値と拡散抵抗値との比を算出し、算出した比と所定の閾値とを比較することによって蓄電モジュール１の異常の有無を判定する。   The determination unit 22 is a part that determines whether or not the power storage module 1 is abnormal based on the calculation result of the resistance value acquired from the resistance value detection unit 21. More specifically, the determination unit 22 determines from the resistance value acquired from the resistance value detection unit 21 that the instantaneous resistance value immediately after starting the constant current charging and a certain period of time after the detection of the instantaneous resistance value. The diffusion resistance value is extracted. The determination unit 22 calculates a ratio between the extracted instantaneous resistance value and the diffusion resistance value, and determines whether the power storage module 1 is abnormal by comparing the calculated ratio with a predetermined threshold value.

ここで、瞬間抵抗値は、定電流充電を開始した直後の抵抗値が急峻に立ち上がる期間から抽出され、本実施形態では、例えば定電流充電を開始してから０秒〜０．１秒の期間の抵抗値から抽出される。瞬間抵抗値は、主にバスバー１２と蓄電装置１１との間の電子抵抗によるものであるため、バスバー１２の接続異常により瞬間抵抗値が増加する傾向にある。また、拡散抵抗値は、抵抗値が急峻に立ち上がった後、時間と共に緩やかに変化する期間から抽出され、本実施形態では、例えば定電流充電を開始してから０．１秒〜１０秒の期間の抵抗値から抽出される。拡散抵抗値は、主に蓄電装置１１内のイオン拡散抵抗によるものであるため、電極の劣化により拡散抵抗値が増加する傾向にある。   Here, the instantaneous resistance value is extracted from a period in which the resistance value immediately after starting constant current charging rises sharply. In this embodiment, for example, a period of 0 to 0.1 seconds after starting constant current charging. It is extracted from the resistance value. Since the instantaneous resistance value is mainly due to the electronic resistance between the bus bar 12 and the power storage device 11, the instantaneous resistance value tends to increase due to abnormal connection of the bus bar 12. Further, the diffusion resistance value is extracted from a period in which the resistance value rises sharply and then gradually changes with time. In this embodiment, for example, a period of 0.1 to 10 seconds from the start of constant current charging. It is extracted from the resistance value. Since the diffusion resistance value is mainly due to the ion diffusion resistance in the power storage device 11, the diffusion resistance value tends to increase due to electrode deterioration.

次に、本実施形態に係る蓄電モジュールの異常検出方法について説明する。図２は、本実施形態に係る異常検出方法のフローチャートである。   Next, the abnormality detection method for the power storage module according to this embodiment will be described. FIG. 2 is a flowchart of the abnormality detection method according to the present embodiment.

まず、充電器２に蓄電モジュール１が接続されると、蓄電モジュール１に対して定電流充電が開始される（Ｓ１）。次に、定電流充電開始時から所定の時間までの蓄電装置１１の抵抗値の検出がなされ（Ｓ２）、抵抗値の検出後、検出された抵抗値から瞬間抵抗値と拡散抵抗値とが抽出される（Ｓ３）。   First, when the power storage module 1 is connected to the charger 2, constant current charging is started for the power storage module 1 (S1). Next, the resistance value of the power storage device 11 is detected from the start of constant current charging to a predetermined time (S2), and after detecting the resistance value, the instantaneous resistance value and the diffusion resistance value are extracted from the detected resistance value. (S3).

続いて、抽出された瞬間抵抗値と拡散抵抗値との比が算出され（Ｓ４）、瞬間抵抗値と拡散抵抗値との比と所定の閾値との比較によって、蓄電モジュール１の異常の有無が判定される（Ｓ５）。   Subsequently, the ratio between the extracted instantaneous resistance value and the diffused resistance value is calculated (S4), and the presence / absence of abnormality of the power storage module 1 is determined by comparing the ratio between the instantaneous resistance value and the diffused resistance value with a predetermined threshold value. It is determined (S5).

ここで、図３は、抵抗値検出部で検出されるデータの一例を示す図である。図３において、グラフ３１は、正常時の蓄電モジュール１の抵抗値の推移の一例を示し、グラフ３２は、電極が劣化したときの蓄電モジュール１の抵抗値の推移の一例を示している。また、グラフ３３は、バスバー１２の接続異常が生じたときの蓄電モジュール１の抵抗値の推移の一例を示している。時間ａにおけるグラフ３１〜３３の抵抗値は、それぞれ瞬間抵抗値Ｒ１〜Ｒ３である。   Here, FIG. 3 is a diagram illustrating an example of data detected by the resistance value detection unit. In FIG. 3, a graph 31 shows an example of a transition of the resistance value of the power storage module 1 at a normal time, and a graph 32 shows an example of a transition of the resistance value of the power storage module 1 when the electrode deteriorates. The graph 33 shows an example of the transition of the resistance value of the power storage module 1 when the connection abnormality of the bus bar 12 occurs. The resistance values of the graphs 31 to 33 at time a are instantaneous resistance values R1 to R3, respectively.

まず、グラフ３１とグラフ３２とを比較すると、グラフ３２における瞬間抵抗値Ｒ２は、グラフ３１における瞬間抵抗値Ｒ１よりも高くなっている。また、グラフ３１の瞬間抵抗値Ｒ１から時間ｂにおける抵抗値Ｄ１への変化幅である拡散抵抗値Ｄ１−Ｒ１と比較して、グラフ３２の瞬間抵抗値Ｒ２から時間ｂにおける抵抗値Ｄ２への変化幅であるＤ２−Ｒ２は大きくなっている。すなわち、電極が劣化したときの蓄電モジュール１では、正常時と比較して瞬間抵抗値及び拡散抵抗値の何れもが上昇する傾向があることが分かる。   First, comparing the graph 31 and the graph 32, the instantaneous resistance value R2 in the graph 32 is higher than the instantaneous resistance value R1 in the graph 31. Further, the change from the instantaneous resistance value R2 in the graph 32 to the resistance value D2 at the time b is compared with the diffusion resistance value D1-R1 which is a change width from the instantaneous resistance value R1 in the graph 31 to the resistance value D1 at the time b. The width D2-R2 is increased. That is, it can be seen that in the power storage module 1 when the electrode is deteriorated, both the instantaneous resistance value and the diffusion resistance value tend to increase as compared with the normal time.

一方、グラフ３１とグラフ３３とを比較すると、グラフ３３における瞬間抵抗値Ｒ３は、グラフ３１における瞬間抵抗値Ｒ１よりも高くなっている。また、グラフ３１の瞬間抵抗値Ｒ１から抵抗値Ｄ１への変化幅である拡散抵抗値Ｄ１−Ｒ１と、グラフ３３の瞬間抵抗値Ｒ３から時間ｂにおける抵抗値Ｄ３への変化幅である拡散抵抗値Ｄ３−Ｒ３は、ほぼ同一となっている。したがって、バスバー１２に接続異常が生じたときの蓄電モジュール１では、正常時と比較して、瞬間抵抗値は上昇するものの、拡散抵抗値は上昇しない傾向があることが分かる。   On the other hand, when comparing the graph 31 with the graph 33, the instantaneous resistance value R3 in the graph 33 is higher than the instantaneous resistance value R1 in the graph 31. Further, the diffusion resistance value D1-R1 that is a change width from the instantaneous resistance value R1 to the resistance value D1 in the graph 31 and the diffusion resistance value that is a change width from the instantaneous resistance value R3 to the resistance value D3 at the time b in the graph 33. D3-R3 is substantially the same. Therefore, it can be seen that, in the power storage module 1 when a connection abnormality occurs in the bus bar 12, the instantaneous resistance value increases but the diffusion resistance value does not increase as compared with the normal state.

これらの結果から、電極が劣化した時の蓄電モジュール１の瞬間抵抗値と拡散抵抗値との比（Ｒ２／（Ｄ２−Ｒ２））を算出すると、この比は、正常時の蓄電モジュール１の瞬間抵抗値と拡散抵抗値との比（Ｒ１／（Ｄ１−Ｒ１））と比較して低くなる。これに対して、バスバー１２に接続異常が生じたときの蓄電モジュール１の瞬間抵抗値と拡散抵抗値との比（Ｒ３／（Ｄ３−Ｒ３））は、正常時の蓄電モジュール１の瞬間抵抗値と拡散抵抗値との比（Ｒ１／（Ｄ１−Ｒ１））と比較して高くなる。したがって、判定部２２において、瞬間抵抗値と拡散抵抗値との比の閾値を例えば１とし、比が１未満である場合にはバスバー１２に接続異常が生じていないと判定でき、比が１を超えている場合には、電極の劣化と切り分けてバスバー１２に接続異常が生じていると判定できる。   From these results, when the ratio (R2 / (D2-R2)) between the instantaneous resistance value and the diffused resistance value of the power storage module 1 when the electrode deteriorates is calculated, this ratio is the instantaneous value of the power storage module 1 in the normal state. It becomes low compared with the ratio (R1 / (D1-R1)) of the resistance value and the diffusion resistance value. On the other hand, the ratio (R3 / (D3-R3)) of the instantaneous resistance value and the diffusion resistance value of the power storage module 1 when a connection abnormality occurs in the bus bar 12 is the instantaneous resistance value of the power storage module 1 at the normal time. And the diffusion resistance value (R1 / (D1-R1)). Therefore, in the determination unit 22, the threshold value of the ratio between the instantaneous resistance value and the diffusion resistance value is set to 1, for example, and when the ratio is less than 1, it can be determined that there is no connection abnormality in the bus bar 12, and the ratio is set to 1. When it exceeds, it can be determined that a connection abnormality has occurred in the bus bar 12 by separating from the deterioration of the electrode.

以上のように、本実施形態では、定電流充電中に抽出した瞬間抵抗値と拡散抵抗値との比を所定の閾値と比較することで、バスバー１２の接続異常の有無を判定する。上述のように、蓄電装置１１内の電極の劣化が生じた場合、正常時と比較して瞬間抵抗値及び拡散抵抗値の何れもが上昇する傾向がある。一方、バスバー１２に接続異常が生じた場合、正常時と比較して瞬間抵抗値は上昇するが、拡散抵抗値は上昇しない傾向がある。したがって、瞬間抵抗値と拡散抵抗値との比を閾値と比較することにより、電極の劣化と切り分けてバスバー１２の接続異常を判別することができる。また、バスバー１２に接続異常が生じていると判定された場合、該当するバスバー１２の接続異常を解消することにより、蓄電モジュール１の抵抗値を下げることができる。   As described above, in the present embodiment, the presence / absence of connection abnormality of the bus bar 12 is determined by comparing the ratio of the instantaneous resistance value and the diffusion resistance value extracted during constant current charging with a predetermined threshold value. As described above, when the electrode in the power storage device 11 is deteriorated, both the instantaneous resistance value and the diffusion resistance value tend to increase as compared with the normal time. On the other hand, when a connection abnormality occurs in the bus bar 12, the instantaneous resistance value increases compared to the normal state, but the diffusion resistance value tends not to increase. Therefore, by comparing the ratio of the instantaneous resistance value and the diffusion resistance value with the threshold value, it is possible to determine the connection abnormality of the bus bar 12 by distinguishing from the deterioration of the electrode. When it is determined that a connection abnormality has occurred in the bus bar 12, the resistance value of the power storage module 1 can be reduced by eliminating the connection abnormality in the corresponding bus bar 12.

本発明は、上記実施形態に限られるものではない。例えば上記実施形態では、電圧計４で測定された蓄電装置１１に接続されたバスバー１２の判定のみを行っているが、蓄電モジュール１全体の電圧値を測定するように電圧計４を設けてもよい。例えば、充電器２に電圧計を設けてもよい。また、蓄電モジュール１全体の一又は複数の蓄電装置毎の電圧値を測定するように電圧計４を複数設けてもよい。これによって、バスバー１２の接続異常の有無を蓄電モジュール１全体の一又は複数の蓄電装置毎に判定することができる。   The present invention is not limited to the above embodiment. For example, in the above embodiment, only the determination of the bus bar 12 connected to the power storage device 11 measured by the voltmeter 4 is performed, but the voltmeter 4 may be provided so as to measure the voltage value of the entire power storage module 1. Good. For example, the charger 2 may be provided with a voltmeter. A plurality of voltmeters 4 may be provided so as to measure the voltage value of one or a plurality of power storage devices as a whole. Thereby, the presence or absence of the connection abnormality of the bus bar 12 can be determined for one or a plurality of power storage devices of the entire power storage module 1.

１…蓄電モジュール、２…充電器、３…異常検出装置、４…電圧計、１１…蓄電装置、１２…バスバー、２１…抵抗値検出部、２２…判定部、Ｒ１〜Ｒ３…瞬間抵抗値。   DESCRIPTION OF SYMBOLS 1 ... Power storage module, 2 ... Charger, 3 ... Abnormality detection device, 4 ... Voltmeter, 11 ... Power storage device, 12 ... Bus bar, 21 ... Resistance value detection part, 22 ... Determination part, R1-R3 ... Instantaneous resistance value.

Claims (4)

蓄電装置同士をバスバーで接続してなる蓄電モジュールにおける前記バスバーの接続異常を検出する蓄電モジュールの異常検出方法であって、
定電流充電を実施しながら前記蓄電装置の抵抗値を検出する抵抗値検出工程と、
前記抵抗値検出工程で検出された抵抗値のうち、前記定電流充電を開始した直後の瞬間抵抗値と、前記定電流充電を開始してから一定時間が経過した後の拡散抵抗値とを抽出し、前記瞬間抵抗値と前記拡散抵抗値との比を所定の閾値と比較して前記バスバーの接続異常の有無を判定する判定工程と、を備え、
前記拡散抵抗値は、前記定電流充電を開始してから一定時間が経過した後に検出された前記蓄電装置の抵抗値と前記瞬間抵抗値との差であることを特徴とする蓄電モジュールの異常検出方法。 A storage module abnormality detection method for detecting a connection abnormality of the bus bar in a storage module formed by connecting storage devices with a bus bar,
A resistance value detecting step of detecting a resistance value of the power storage device while performing constant current charging;
From the resistance values detected in the resistance value detection step, extract the instantaneous resistance value immediately after starting the constant current charging and the diffusion resistance value after a certain time has elapsed since the constant current charging started. and, and a determination step of determining whether the abnormal connection of the bus bar by comparing the ratio of the instantaneous resistance between the diffusion resistance value with a predetermined threshold value,
The diffusion resistance value is a difference between the resistance value of the power storage device and the instantaneous resistance value detected after a lapse of a certain time from the start of the constant current charging, and the abnormality detection of the power storage module is characterized in that Method. 前記抵抗値検出工程において、前記各蓄電装置のバスバー間の抵抗値をそれぞれ検出することを特徴とする請求項１記載の蓄電モジュールの異常検出方法。   The abnormality detection method for a power storage module according to claim 1, wherein in the resistance value detection step, a resistance value between bus bars of each power storage device is detected. 蓄電装置同士をバスバーで接続してなる蓄電モジュールにおける前記バスバーの接続異常を検出する蓄電モジュールの異常検出装置であって、
前記蓄電モジュールの定電流充電が実施されたときに前記蓄電装置の抵抗値を検出する抵抗値検出部と、
前記抵抗値検出部で検出された抵抗値のうち、前記定電流充電を開始した直後の瞬間抵抗値と、前記定電流充電を開始してから一定時間が経過した後の拡散抵抗値とを抽出し、前記瞬間抵抗値と前記拡散抵抗値との比を所定の閾値と比較して前記バスバーの接続異常の有無を判定する判定部と、を備え、
前記拡散抵抗値は、前記定電流充電を開始してから一定時間が経過した後に検出された前記蓄電装置の抵抗値と前記瞬間抵抗値との差であることを特徴とする蓄電モジュールの異常検出装置。 An abnormality detection device for a power storage module that detects a connection abnormality of the bus bar in a power storage module formed by connecting power storage devices with a bus bar,
A resistance value detection unit that detects a resistance value of the power storage device when constant current charging of the power storage module is performed;
From the resistance values detected by the resistance value detection unit, the instantaneous resistance value immediately after starting the constant current charging and the diffusion resistance value after a certain time has elapsed since the constant current charging started are extracted. And a determination unit that compares the ratio of the instantaneous resistance value and the diffusion resistance value with a predetermined threshold value to determine whether there is a connection abnormality in the bus bar , and
The diffusion resistance value is a difference between the resistance value of the power storage device and the instantaneous resistance value detected after a lapse of a certain time from the start of the constant current charging, and the abnormality detection of the power storage module is characterized in that apparatus. 前記抵抗値検出部は、前記各蓄電装置の抵抗値をそれぞれ検出することを特徴とする請求項３記載の蓄電モジュールの異常検出装置。   The abnormality detection device for a power storage module according to claim 3, wherein the resistance value detection unit detects a resistance value of each of the power storage devices.
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