JP2004087412A - Inspection method and inspection device of lead storage battery - Google Patents

Inspection method and inspection device of lead storage battery Download PDF

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Publication number
JP2004087412A
JP2004087412A JP2002249999A JP2002249999A JP2004087412A JP 2004087412 A JP2004087412 A JP 2004087412A JP 2002249999 A JP2002249999 A JP 2002249999A JP 2002249999 A JP2002249999 A JP 2002249999A JP 2004087412 A JP2004087412 A JP 2004087412A
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Prior art keywords
strap
electrode strap
value
inspection
cell
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Japanese (ja)
Inventor
Tetsuo Kamibayashi
上林 哲夫
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Resonac Corp
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Shin Kobe Electric Machinery Co Ltd
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Priority to JP2002249999A priority Critical patent/JP2004087412A/en
Publication of JP2004087412A publication Critical patent/JP2004087412A/en
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/378Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] specially adapted for the type of battery or accumulator
    • G01R31/379Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] specially adapted for the type of battery or accumulator for lead-acid batteries
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/52Testing for short-circuits, leakage current or ground faults

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Secondary Cells (AREA)
  • Tests Of Electric Status Of Batteries (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To obtain an inspection method of a lead storage battery in which un-connecting and connection failure of inter-cell connection part can be inspected simultaneously in addition to the inspection of a short circuit-failure of a measuring cell without increasing inspection man-hour. <P>SOLUTION: The resistance value is measured by applying a voltage between a positive electrode strap 5b or a negative electrode strap 5a of electrode plate groups 4 in a certain cell chamber 3, and a positive electrode strap 5b or a negative electrode strap 5a of electrode plate groups 4 in the adjacent cell chamber 3 connected to the positive electrode strap 5b or the negative electrode strap 5a on the opposite side to these electrode plate groups 4 by a connecting part 6 between cells. When the measured resistance value is a value within a prescribed range, this is judged as an excellent article, when it is less than the value within the prescribed range, this is judged as a short circuit-failure, and when it is more than the value within the prescribed range, it is judged as inter-cell connection failure. <P>COPYRIGHT: (C)2004,JPO

Description

【0001】
【発明の属する技術分野】
本発明は、鉛蓄電池の検査方法及び検査装置に関するものである。
【0002】
【従来の技術】
鉛蓄電池は、図2に示すように、電槽1内が隔壁2で複数のセル室3に区画されていて、これらのセル室3内に極板群4がそれぞれ収容された構造になっている。極板群4は、複数の正極板と複数の負極板がセパレータを介して交互に積層され、各負極板の耳部は負極ストラップ5aで接続され、各正極板の耳部は正極ストラップ5bで接続されている。隣接するセル室3の極板群4間が、隔壁2を隔てて対向するストラップ5a,5bをセル間接続部6で接続することにより直列接続されている。
【0003】
このような鉛蓄電池の従来の検査は、測定すべき極板群4の負極ストラップ5aと正極ストラップ5bとの間に電圧を印加して抵抗値(電圧低下)を測定し、測定された抵抗値が所定の範囲内の下限値を下回ったときにそのセルの短絡不良とし、極板群4に対して電極(プローブ)が当たらなかった場合、所定の電圧低下が無いため抵抗値が所定の範囲内の上限値を上回り、接触不良と判定し、図示の例では6セルの短絡の検査を行っていた。
【0004】
【発明が解決しようとする課題】
しかしながら、しかしながらこのような鉛蓄電池の検査方法では、セル間接続後の接続ができているか否かの確認ができないため、製造工程が進み、セル間接続不良の発見が遅れる問題点があった。
【0005】
本発明の目的は、検査工数を増すことなく、測定セルの短絡不良の検査に加えて、セル間接続部の未接続や接続不良の検査を同時に行える鉛蓄電池の検査方法及び検査装置を提供することにある。
【0006】
【課題を解決するための手段】
本発明は、電槽内の複数のセル室に極板群がそれぞれ収容され、隣接するセル室の極板群間がセル間接続部で接続されている鉛蓄電池を検査する鉛蓄電池の検査方法を対象とする。
【0007】
本発明に係る鉛蓄電池の検査方法では、あるセル室内の極板群の正極ストラップ又は負極ストラップと、該極板群の反対側の負極ストラップ又は正極ストラップにセル間接続部で接続されている隣接するセル室内の極板群のストラップとの間に電圧を印加して抵抗値を測定し、測定された抵抗値が所定の範囲内の値のときに良品と判定し、所定の範囲内の値より下回るときに短絡不良と判定し、所定の範囲内の値より上回るときにセル間接続不良と判定することを特徴とする。
【0008】
このようにあるセル室内の極板群の正極ストラップ又は負極ストラップと、該極板群の反対側の負極ストラップ又は正極ストラップにセル間接続部で接続されている隣接するセル室内の極板群のストラップとの間に電圧を印加して抵抗値を測定すると、検査工数を増すことなく、測定セルの短絡不良の検査に加えて、従来測定ができなかったセル間接続部の未接続や接続不良の検査を同時に行うことができる。
【0009】
次に本発明は、電槽内の複数のセル室に極板群がそれぞれ収容され、隣接するセル室の極板群間がセル間接続部で接続されている鉛蓄電池を検査する鉛蓄電池の検査装置を対象とする。
【0010】
本発明に係る鉛蓄電池の検査装置では、あるセル室内の極板群の正極ストラップ又は負極ストラップと、該極板群の反対側の負極ストラップ又は正極ストラップにセル間接続部で接続されている隣接するセル室内の極板群の正極ストラップ又は負極ストラップとの間に電圧を印加して抵抗値を測定する電圧印加抵抗値測定手段と、測定された抵抗値が所定の範囲内の値のときに良品と判定し、所定の範囲内の値より下回るときに短絡不良と判定し、所定の範囲内の値より上回るときにセル間接続不良と判定する検査結果判定手段とを有することを特徴とする。
【0011】
このように電圧印加抵抗値測定手段により、あるセル室内の極板群の正極ストラップ又は負極ストラップと、該極板群の反対側の負極ストラップ又は正極ストラップにセル間接続部で接続されている隣接するセル室内の極板群の正極ストラップ又は負極ストラップとの間に電圧を印加して抵抗値を測定するので、検査工数を増すことなく、測定セルの短絡不良の検査に加えて、従来測定ができなかったセル間接続部の未接続や接続不良の検査を同時に行うことができる。
【0012】
この場合、検査結果判定手段に検査結果表示手段を接続すると、前述した検査結果の表示を行うことができる。
【0013】
【発明の実施の形態】
図1は本発明に係る鉛蓄電池の検査装置における実施の形態の一例を示した平面図である。
【0014】
本例の鉛蓄電池の検査装置は、あるセル室3内の極板群4の負極ストラップ5aと、該極板群4の反対側の正極ストラップ5bにセル間接続部6で接続されている隣接するセル室3内の極板群4の負極ストラップ5aとの間に電極(プローブ)7a,7bで電圧を印加して抵抗値を測定する電圧印加抵抗値測定手段8と、測定された抵抗値が所定の範囲内の値のときに良品と判定し、所定の範囲内の値より下回るときに短絡不良と判定し、所定の範囲内の値より上回るときにセル間接続不良と判定するコンパレータよりなる検査結果判定手段9と、この検査結果判定手段9に接続された検査結果表示手段10とを有する。
【0015】
次に、上記の如き鉛蓄電池の検査装置を用いた鉛蓄電池の検査方法について説明する。あるセル室3内の極板群4の負極ストラップ5aと、該極板群4の反対側の正極ストラップ5bにセル間接続部6で接続されている隣接するセル室3内の極板群4の負極ストラップ5aとの間に電圧印加抵抗値測定手段8で電極(プローブ)7a,7bにより電圧を印加して抵抗値を測定する。次に、検査結果判定手段9により、測定された抵抗値が所定の範囲内の値のときに良品と判定し、所定の範囲内の値より下回るときに短絡不良と判定し、所定の範囲内の値より上回るときにセル間接続不良と判定する。この検査結果に応じて、検査結果表示手段10によりA:短絡、B:セル間接続不良、C:良品と表示する。
【0016】
このように検査ワークの不良箇所を表示させ、作業者による取出しを行い、分離を可能とした。
【0017】
このような鉛蓄電池の検査方法及び検査装置によれば、検査工数を増すことなく、測定セルの短絡不良の検査に加えて、従来測定ができなかったセル間接続部の未接続や接続不良の検査を同時に行うことができる。
【0018】
上記例では、図1の左側の負極ストラップ5a側から測定を行ったが、図1の右側の正極ストラップ5b側から測定を行ってもよい。
【0019】
【発明の効果】
本発明に係る鉛蓄電池の検査方法では、あるセル室内の極板群の正極ストラップ又は負極ストラップと、該極板群の反対側の負極ストラップ又は正極ストラップにセル間接続部で接続されている隣接するセル室内の極板群の正極ストラップ又は負極ストラップとの間に電圧を印加して抵抗値を測定するので、検査工数を増すことなく、測定セルの短絡不良の検査に加えて、従来測定ができなかったセル間接続部の未接続や接続不良の検査を同時に行うことができる。
【0020】
また本発明に係る鉛蓄電池の検査装置では、電圧印加抵抗値測定手段により、あるセル室内の極板群の正極ストラップ又は負極ストラップと、該極板群の反対側の負極ストラップ又は正極ストラップにセル間接続部で接続されている隣接するセル室内の極板群の正極ストラップ又は負極ストラップとの間に電圧を印加して抵抗値を測定するので、検査工数を増すことなく、測定セルの短絡不良の検査に加えて、従来測定ができなかったセル間接続部の未接続や接続不良の検査を同時に行うことができる。さらに、検査結果判定手段により、良品の判定と、短絡不良の判定と、セル間接続不良の判定とを行うことができる。
【0021】
この場合、検査結果判定手段に検査結果表示手段を接続すると、前述した検査結果の表示を行うことができる。
【図面の簡単な説明】
【図1】本発明に係る鉛蓄電池の検査装置における実施の形態の一例を示した平面図である。
【図2】従来の鉛蓄電池の平面図である。
【符号の説明】
1 電槽
2 隔壁
3 セル室
4 極板群
5a 負極ストラップ
5b 正極ストラップ
6 セル間接続部
7a,7b 電極(プローブ)
8 電圧印加抵抗値測定手段
9 検査結果判定手段
10 検査結果表示手段
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a lead storage battery inspection method and an inspection device.
[0002]
[Prior art]
As shown in FIG. 2, the lead storage battery has a structure in which a battery case 1 is divided into a plurality of cell chambers 3 by partition walls 2, and an electrode plate group 4 is accommodated in each of the cell chambers 3. I have. In the electrode plate group 4, a plurality of positive plates and a plurality of negative plates are alternately stacked with a separator interposed therebetween, and the ears of each negative plate are connected by a negative strap 5a, and the ears of each positive plate are connected by a positive strap 5b. It is connected. The electrode groups 4 of the adjacent cell chambers 3 are connected in series by connecting the straps 5 a and 5 b facing each other with the partition wall 2 therebetween at the inter-cell connecting portion 6.
[0003]
In the conventional inspection of such a lead-acid battery, a voltage is applied between the negative electrode strap 5a and the positive electrode strap 5b of the electrode plate group 4 to be measured to measure a resistance value (voltage drop), and the measured resistance value is measured. Is smaller than the lower limit of the predetermined range, the cell is determined to be short-circuited. If the electrode (probe) does not hit the electrode plate group 4, there is no predetermined voltage drop. In this case, it was judged that the contact was poor and the short circuit of 6 cells was inspected in the illustrated example.
[0004]
[Problems to be solved by the invention]
However, in such a lead storage battery inspection method, it is not possible to confirm whether or not the connection has been established after the connection between the cells. Therefore, there has been a problem that the manufacturing process progresses and the discovery of a defective connection between the cells is delayed.
[0005]
An object of the present invention is to provide an inspection method and an inspection apparatus for a lead-acid battery that can simultaneously inspect a short-circuit failure of a measurement cell and a disconnection or a connection failure of a connection between cells without increasing the number of inspection steps. It is in.
[0006]
[Means for Solving the Problems]
The present invention relates to a lead storage battery inspection method for inspecting a lead storage battery in which electrode groups are respectively housed in a plurality of cell chambers in a battery case, and the electrode groups of adjacent cell chambers are connected at an inter-cell connection part. Target.
[0007]
In the method for testing a lead storage battery according to the present invention, the positive electrode strap or the negative electrode strap of the electrode group in a certain cell chamber is connected to the negative electrode strap or the positive electrode strap on the opposite side of the electrode group by an inter-cell connection part. A voltage is applied between the strap of the electrode group in the cell chamber to be measured, and the resistance value is measured. When the measured resistance value is within a predetermined range, it is determined to be non-defective, and the value within the predetermined range is determined. When the value is lower than the predetermined value, it is determined that the short-circuit is defective. When the value is higher than a value within a predetermined range, it is determined that the inter-cell connection is defective.
[0008]
As described above, the positive electrode strap or the negative electrode strap of the electrode group in the certain cell chamber and the negative electrode strap or the positive electrode strap on the opposite side of the electrode group are connected to the electrode group in the adjacent cell chamber connected to the intercell connection part. When a resistance is measured by applying a voltage to the strap, the test cell can be inspected for short-circuit failure without increasing the number of inspection steps. Inspection can be performed simultaneously.
[0009]
Next, the present invention relates to a lead-acid battery for inspecting a lead-acid battery in which a plurality of electrode chambers are accommodated in a plurality of cell chambers in a battery case, respectively, and the electrode groups of adjacent cell chambers are connected at an inter-cell connection part. For inspection equipment.
[0010]
In the lead storage battery inspection device according to the present invention, the positive electrode strap or the negative electrode strap of the electrode group in a certain cell chamber is adjacent to the negative electrode strap or the positive electrode strap on the opposite side of the electrode group at the inter-cell connection part. Voltage applying resistance value measuring means for applying a voltage between the positive electrode strap or the negative electrode strap of the electrode group in the cell chamber to measure the resistance value, and when the measured resistance value is within a predetermined range. Test result determining means for determining a non-defective product, determining a short-circuit failure when the value falls below a value within a predetermined range, and determining a connection failure between cells when exceeding a value within a predetermined range. .
[0011]
As described above, by the voltage application resistance value measuring means, the positive electrode strap or the negative electrode strap of the electrode group in a certain cell chamber is connected to the negative electrode strap or the positive electrode strap on the opposite side of the electrode group by the intercell connection. Since the resistance is measured by applying a voltage between the positive electrode strap or the negative electrode strap of the electrode group in the cell chamber to be measured, the conventional measurement can be performed in addition to the inspection of the short-circuit failure of the measurement cell without increasing the number of inspection steps. Inspection of unconnection or connection failure of the inter-cell connection part that could not be performed can be performed at the same time.
[0012]
In this case, if the inspection result display means is connected to the inspection result determination means, the above-described inspection result can be displayed.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a plan view showing an example of an embodiment of a lead storage battery inspection device according to the present invention.
[0014]
The lead-acid storage battery inspection device according to the present embodiment includes a negative electrode strap 5 a of an electrode group 4 in a certain cell chamber 3 and an adjacent positive electrode strap 5 b connected to an opposite side of the electrode group 4 at an inter-cell connection portion 6. Voltage applying resistance measuring means 8 for applying a voltage between electrodes (probes) 7a and 7b between the negative electrode strap 5a of the electrode group 4 in the cell chamber 3 to measure the resistance, and the measured resistance Is determined to be non-defective when the value is within a predetermined range, a short-circuit failure is determined when the value is lower than a value within the predetermined range, and a cell connection failure is determined when the value is higher than a value within the predetermined range. And a test result display means 10 connected to the test result determining means 9.
[0015]
Next, a method for inspecting a lead-acid battery using the above-described inspection device for a lead-acid battery will be described. A negative electrode strap 5a of an electrode group 4 in a certain cell chamber 3 and an electrode group 4 in an adjacent cell chamber 3 connected to a positive electrode strap 5b on the opposite side of the electrode group 4 by an inter-cell connecting portion 6. A voltage is applied between the electrodes (probes) 7a and 7b by a voltage application resistance value measuring means 8 between the negative electrode strap 5a and the negative electrode strap 5a to measure the resistance value. Next, the inspection result determining means 9 determines that the measured resistance value is non-defective when the measured resistance value is within a predetermined range, and determines that the short-circuit failure occurs when the measured resistance value falls below a predetermined range. It is determined that the inter-cell connection is defective when the value exceeds the value. According to the inspection result, the inspection result display means 10 displays A: short circuit, B: poor connection between cells, and C: non-defective.
[0016]
In this way, the defective portion of the inspection work is displayed, the operator takes it out, and separation is possible.
[0017]
According to such a lead-acid battery inspection method and inspection apparatus, in addition to the inspection of the short-circuit failure of the measurement cell, the disconnection and the connection failure of the inter-cell connection part which could not be measured conventionally can be performed without increasing the inspection man-hour. The inspection can be performed simultaneously.
[0018]
In the above example, the measurement was performed from the negative electrode strap 5a side on the left side in FIG. 1, but the measurement may be performed from the positive electrode strap 5b side on the right side in FIG.
[0019]
【The invention's effect】
In the method for testing a lead-acid battery according to the present invention, the positive electrode strap or the negative electrode strap of the electrode group in a certain cell chamber is connected to the negative electrode strap or the positive electrode strap on the opposite side of the electrode group by an inter-cell connection part. Since the resistance is measured by applying a voltage between the positive electrode strap or the negative electrode strap of the electrode group in the cell chamber to be measured, the conventional measurement can be performed in addition to the inspection of the short-circuit failure of the measurement cell without increasing the number of inspection steps. Inspection of unconnection or connection failure of the inter-cell connection part that could not be performed can be performed at the same time.
[0020]
Further, in the lead storage battery inspection device according to the present invention, the voltage application resistance value measuring unit may connect the cell to the positive electrode strap or the negative electrode strap of the electrode group in a certain cell chamber and the negative electrode strap or the positive electrode strap on the opposite side of the electrode group. Since a voltage is applied between the positive electrode strap and the negative electrode strap of the electrode group in the adjacent cell chamber connected at the connection section to measure the resistance value, short-circuit failure of the measurement cell can be performed without increasing the number of inspection steps. In addition to the inspection described above, it is possible to simultaneously perform an inspection for a disconnection or a connection failure of a connection between cells, which could not be measured conventionally. Further, the inspection result determination means can determine a non-defective product, a short-circuit failure, and a connection failure between cells.
[0021]
In this case, if the inspection result display means is connected to the inspection result determination means, the above-described inspection result can be displayed.
[Brief description of the drawings]
FIG. 1 is a plan view showing an example of an embodiment of a lead storage battery inspection device according to the present invention.
FIG. 2 is a plan view of a conventional lead storage battery.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Battery case 2 Partition wall 3 Cell room 4 Electrode group 5a Negative electrode strap 5b Positive electrode strap 6 Inter-cell connection part 7a, 7b Electrode (probe)
8 Voltage application resistance value measuring means 9 Inspection result judgment means 10 Inspection result display means

Claims (3)

電槽内の複数のセル室に極板群がそれぞれ収容され、隣接する前記セル室の前記極板群間がセル間接続部で接続されている鉛蓄電池を検査する鉛蓄電池の検査方法であって、
あるセル室内の前記極板群の正極ストラップ又は負極ストラップと、該極板群の反対側の前記負極ストラップ又は前記正極ストラップにセル間接続部で接続されている隣接するセル室内の極板群の正極ストラップ又は負極ストラップとの間に電圧を印加して抵抗値を測定し、測定された抵抗値が所定の範囲内の値のときに良品と判定し、前記所定の範囲内の値より下回るときに短絡不良と判定し、前記所定の範囲内の値より上回るときにセル間接続不良と判定することを特徴とする鉛蓄電池の検査方法。
A lead-acid battery inspection method for inspecting a lead-acid battery in which a plurality of electrode groups are accommodated in a plurality of cell chambers in a battery case, and the electrode groups in adjacent cell chambers are connected to each other at an inter-cell connection part. hand,
A positive electrode strap or a negative electrode strap of the electrode group in a certain cell chamber, and an electrode group in an adjacent cell chamber connected to the negative electrode strap or the positive electrode strap on the opposite side of the electrode group at an inter-cell connection portion. When a resistance is measured by applying a voltage between the positive electrode strap or the negative electrode strap, when the measured resistance value is within a predetermined range, it is determined to be non-defective, and when the measured resistance value is lower than a value within the predetermined range. A method for inspecting a lead-acid battery, comprising: determining a short-circuit failure; and determining a connection failure between cells when the short-circuit failure exceeds a value within the predetermined range.
電槽内の複数のセル室に極板群がそれぞれ収容され、隣接する前記セル室の前記極板群間がセル間接続部で接続されている鉛蓄電池を検査する鉛蓄電池の検査装置であって、
あるセル室内の前記極板群の正極ストラップ又は負極ストラップと、該極板群の反対側の前記負極ストラップ又は前記正極ストラップにセル間接続部で接続されている隣接するセル室内の極板群の正極ストラップ又は負極ストラップとの間に電圧を印加して抵抗値を測定する電圧印加抵抗値測定手段と、測定された抵抗値が所定の範囲内の値のときに良品と判定し、前記所定の範囲内の値より下回るときに短絡不良と判定し、前記所定の範囲内の値より上回るときにセル間接続不良と判定する検査結果判定手段とを有することを特徴とする鉛蓄電池の検査装置。
A lead-acid battery inspection apparatus for inspecting a lead-acid battery in which a plurality of electrode chambers are accommodated in a plurality of cell chambers in a battery case, and the electrode groups of adjacent cell chambers are connected to each other at an inter-cell connection part. hand,
A positive electrode strap or a negative electrode strap of the electrode group in a certain cell chamber, and an electrode group in an adjacent cell chamber connected to the negative electrode strap or the positive electrode strap on the opposite side of the electrode group at an inter-cell connection portion. Voltage application resistance value measuring means for applying a voltage between the positive electrode strap or the negative electrode strap to measure a resistance value, and determining that the measured resistance value is a non-defective product when the measured resistance value is within a predetermined range, An inspection device for a lead-acid battery, comprising: inspection result determination means for determining a short circuit failure when the value is less than a value within the range, and determining a connection failure between cells when the value exceeds the value within the predetermined range.
前記検査結果判定手段には、検査結果表示手段が接続されていることを特徴とする請求項2に記載の鉛蓄電池の検査装置。The inspection device for a lead storage battery according to claim 2, wherein an inspection result display unit is connected to the inspection result determination unit.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100465654C (en) * 2006-09-15 2009-03-04 天津力神电池股份有限公司 Method for detecting short circuit of non-aqueous electrolyte secondary batteries
JP2018510332A (en) * 2015-02-09 2018-04-12 アキュロジック・コーポレイション Method and apparatus for testing battery connections

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100465654C (en) * 2006-09-15 2009-03-04 天津力神电池股份有限公司 Method for detecting short circuit of non-aqueous electrolyte secondary batteries
JP2018510332A (en) * 2015-02-09 2018-04-12 アキュロジック・コーポレイション Method and apparatus for testing battery connections
US10151789B2 (en) 2015-02-09 2018-12-11 Acculogic Corporation Method and device for testing the connections of batteries

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