JP3657119B2 - Battery protection circuit power saving measurement method - Google Patents

Battery protection circuit power saving measurement method Download PDF

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JP3657119B2
JP3657119B2 JP21219898A JP21219898A JP3657119B2 JP 3657119 B2 JP3657119 B2 JP 3657119B2 JP 21219898 A JP21219898 A JP 21219898A JP 21219898 A JP21219898 A JP 21219898A JP 3657119 B2 JP3657119 B2 JP 3657119B2
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protection circuit
battery protection
terminal
current
battery
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JP2000050506A (en
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直也 田中
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Rohm Co Ltd
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Rohm Co Ltd
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Description

【０００１】
【発明の属する技術分野】
本発明は、充放電可能な充電池を保護するための電池保護回路が正常に動作するか否かを試験する電池保護回路の試験方法に関する。
【０００２】
【従来の技術】
従来の電池保護回路について、図１及び図５を用いて説明する。図１は電池保護回路の構成を示したブロック図である。電池保護回路１は、端子２〜６と、端子２と端子の５との間に直列に接続したＮチャネルＭＯＳＦＥＴトランジスタＱ１、Ｑ２と、端子４と端子６との間に接続した電流検出抵抗Ｒと、端子２と端子３間の電位差、端子３と端子４の電位差、及び前記電流検出抵抗の両端にかかる電位差を測定するとともに前記電位差がそれぞれ正常範囲であれば前記ＮチャネルＭＯＳＦＥＴトランジスタＱ１、Ｑ２が両方ともＯＮの状態であるように制御するような保護ＩＣ７とを有する回路である。
【０００３】
また、ＮチャネルＭＯＳＦＥＴトランジスタＱ１、Ｑ２は、各トランジスタＱ１、Ｑ２のソースがそれぞれ前記端子２、前記端子５と接続するとともに、両トランジスタのドレイン同士が接続している。また、両トランジスタのゲートは保護ＩＣ７と接続している。
【０００４】
尚、前記電池保護回路１は、前記電流検出抵抗Ｒと前記ＮチャネルＭＯＳＦＥＴトランジスタＱ１、Ｑ２が、前記端子２と前記端子５との間、又は前記端子４と前記端子６との間に直列に接続されているような構成の電池保護回路でも良い。
【０００５】
このような構成の電池保護回路１において、端子２と端子３との間に２次電池Ｂ１を、端子３と端子４との間に２次電池Ｂ２を接続する。放電時に該２次電池Ｂ１、Ｂ２のいずれかの電圧が正常範囲を下回ったとき、前記保護ＩＣ７によって過放電保護作用が働き、前記トランジスタＱ２のゲート電圧を下げて該トランジスタＱ２の動作を停止させることによって、放電電流をカットする。
【０００６】
また、逆に充電時に前記２次電池Ｂ１、Ｂ２のいずれかの電圧が正常範囲を上回ったとき、前記保護ＩＣ７によって過充電保護作用が働き、前記トランジスタＱ１のゲート電圧を下げて該トランジスタＱ１の動作を停止させることによって、充電電流をカットする。
【０００７】
更に、充放電時に、前記電流検出抵抗Ｒに過電流が流れ、該抵抗Ｒの両端にかかる電位差がその正常範囲を超えると、前記保護ＩＣ７によって過電流保護が働き、充電時には前記トランジスタＱ１の動作を停止させて充電電流をカットし、放電時には前記トランジスタＱ２の動作を停止させて放電電流をカットする。
【０００８】
図５は前記電池保護回路１の動作を確認する試験を行うための従来の試験装置を示すブロック図である。前記電池保護回路１の端子２と端子３の間、及び端子３と端子４の間に充放電を行う２次電池の擬似的な電源としてバイポーラ電源８、９が接続され、端子５にスイッチ１０が接続され、前記スイッチ１０の接点１０ａと端子６の間に充電装置１１が、前記スイッチ１０の接点１０ｂと端子６の間に負荷の大きさが可変的な大容量の負荷１２がそれぞれ接続されている。
【０００９】
以下に、上記のような構成の試験装置を使用した従来の過放電試験、過充電試験及び過電流試験のそれぞれについて説明する。
【００１０】
過放電試験は、まず、スイッチ１０の接点１０ｂ側に設定し、前記電池保護回路１と負荷１２と接続することによって、２次電池が放電動作を行うような状態にする。このとき、放電電流ＩＤを流した状態で前記バイポーラ電源８又は９の電圧を下降させて、該電圧がその正常範囲を下回ったときに前記放電電流ＩＤがカットされたか否かを確認する。
【００１１】
過充電試験は、まず、前記スイッチ１０の接点１０ａ側に設定し、前記電池保護回路１と充電装置１１を接続することによって、２次電池が充電動作を行うような状態にする。このとき、充電電流ＩＣを流した状態で前記バイポーラ電源８又は９の電圧を上昇させて、該電圧がその正常範囲を上回ったときに前記充電電流ＩＣがカットされたか否かを確認する。
【００１２】
過電流試験は、前記スイッチ１０の接点１０ｂ側に設定することによって、放電電流が前記電池保護回路１に流れ込むような状態にする。このとき、前記バイポーラ電源８及び９の電圧を正常な範囲の電圧に制御し、該電池保護回路１に接続された前記負荷１２を操作することによって、該電池保護回路１に流れ込む放電電流を増加させ、該電流が正常範囲を上回ったとき、電流がカットされたか否かを確認する。
【００１３】
尚、２次電池の充電動作が行わている状態で過電流が流れることは極めてまれなことであるので、充電状態での過電流試験は、一般的には行われない。
【００１４】
【発明が解決しようとする課題】
従来の電池保護回路の試験方法の場合、上述したように前記電池保護回路１に実際の負荷を接続して試験を行うので、実際に使用するときの電力を試験装置から害電池保護回路１に供給する必要がある。
【００１５】
該試験方法で使用するのに必要な前記電力は、直列に接続された前記充電池の数Ｎを該充電池の電圧４Ｖに掛けて得られる電圧４ＮＶに、更に該試験を行うために必要な試験電流１〜１０Ａを掛け合わせた４Ｎ〜４０ＮＷという大電力となる。そのため、該試験方法で使用されるバイポーラ電源装置もこのような大電力を供給するような電源が必要なために容量の大きな装置が必要となる。
【００１６】
また、該試験方法では、前記バイポーラ電源８、９に容量の大きなバイポーラ電源装置が必要となるだけでなく、該バイポーラ電源８、９を使用して模擬的に前記電池保護回路１を介して充放電を行わせるための前記充電装置１１と前記大容量の負荷１２をも必要とするために、該試験方法で使用する試験装置は大規模なものとなる。
【００１７】
そこで、本発明では、電池保護回路１に接続する電源が小容量ですむような電池保護回路の試験方法を提供することを目的とする。
【００１８】
また、本発明では、小規模な試験装置で試験することが可能な電池保護回路の試験方法を提供することを目的とする。
【００１９】
また、前記従来の試験方法によると、実際に使用するときに直列に接続される２次電池の数が変化するとともに前記電池保護回路１にかかる電圧が変化することを想定して、前記電池保護回路１に設定電圧の違う前記バイポーラ電源８、９を接続したとき、接続する前記充電装置１１及び前記大容量の負荷１２をも別の容量のものに変更しなければならない。そのため、前記充電装置１１と前記大容量の負荷１２が多種必要となり、前記バイポーラ電源の設定電圧を変更する度に前記試験装置を組み替え直さなければならない。
【００２０】
本発明では、上記問題を鑑み、前記電池保護回路１に接続した電源から供給される設定電圧の大きさを変更する度に、前記試験装置を組み替え直す必要がなく、前記電池保護回路１のスイッチング制御の動作が正常に行われるか否か試験できるような汎用性のある試験装置を使用した電池保護回路の試験方法を提供することを目的とする。
【００２１】
【課題を解決するための手段】
本発明の電池保護回路の試験方法は、充放電可能な２次電池が接続される２次電池接続端子と、負荷又は充電装置が接続される負荷接続端子と、前記２次電池の電圧値を検出する電圧検出部と、前記２次電池から流れる電流値を検出する電流検出部と、前記電圧検出部で検出した電圧値が所定の電圧値より高くなるか、もしくは前記電流検出部で検出した電流値が所定の電流値を超えたときに前記２次電池の充放電路を遮断する出力制御部とを有する電池保護回路が正常に働いているか否かを試験する電池保護回路の試験方法において、前記電池保護回路の２次電池接続端子に試験電圧を供給する電源と、前記電池保護回路の２次電池接続端子と負荷接続端子間に試験電流を供給する定電流電源とを前記２次電池の代わりに前記電池保護回路に接続して行うことを特徴とする。
【００２２】
このような構成で行われる電池保護回路の試験方法によると、従来の試験方法のように該電池保護回路の負荷接続端子に実際に使用される負荷や充電装置を接続する必要がない。また、２次電池接続端子に接続した電源に流れる電流値を小さくし、かつ２次電池接続端子と負荷接続端子間に接続した定電流電源にかかる電圧を低くして、試験装置が消費する消費電力を抑制する。
【００２３】
【発明の実施の形態】
本発明の実施形態について、図１〜４を用いて説明する。図２は、電池保護回路１の動作の確認を行うための試験装置の構成を示したブロック図である。図３は、図２の電源回路１３の回路図の１例を示したものである。図４は、図２の定電流電源１４、１５の内部の構成を示した簡単な回路図である。
【００２４】
本実施形態では、図１に示した電池保護回路１を試験対象として、説明する。尚、従来の試験方法と同様に、図１に示した電池保護回路以外の、前記電流検出抵抗ＲとＮチャネルＭＯＳＦＥＴトランジスタＱ１、Ｑ２が、端子２と端子５との間、又は端子４と端子６との間に直列に接続されているような構成の電池保護回路を試験対象としても良い。
【００２５】
図２に示すように、前記電池保護回路１の端子２〜４に電源回路１３を接続し、また、前記電池保護回路１の端子２と端子５の間と、端子４と端子６の間とにそれぞれ定電流電源１４、１５を接続する。このとき使用する電源回路１３は、実際に前記電池保護回路１を２次電池に接続したときの充放電時の電圧を供給するとともに、該電池保護回路１を動作させるのに十分な１ｍＡまでの少量の電流を供給するような電源回路である。
【００２６】
このような電源回路１３においてオペアンプを使用した例について、図３（ａ）を用いて説明する。コントローラ１６の出力端子１６ａに抵抗Ｒ１を、出力端子１６ｂに抵抗Ｒ５を、出力端子１６ｃに抵抗Ｒ３とＲ７をそれぞれ接続する。また、抵抗Ｒ１と抵抗Ｒ２の接続ノードをオペアンプＡ１の負入力端子Ａ１ａに接続し、抵抗Ｒ３と抵抗Ｒ４の接続ノードをオペアンプの正入力端子Ａ１ｂに接続する。そして、抵抗Ｒ５と抵抗Ｒ６の接続ノードをオペアンプＡ２の負入力端子Ａ２ａに接続し、抵抗Ｒ７と抵抗Ｒ８の接続ノードをオペアンプＡ２の正入力端子Ａ２ｂに接続する。前記抵抗Ｒ２の他端を前記オペアンプＡ１の出力端子Ａ１ｃと前記電池保護回路１の端子２に接続し、抵抗Ｒ４の他端と抵抗Ｒ６の他端を前記オペアンプＡ２の出力端子Ａ２ｃに接続するとともに、前記電池保護回路１の端子３に接続する。更に、抵抗Ｒ８の他端を、前記電池保護回路１の端子４に接続する。
【００２７】
上記のような電源回路１３は、図３（ｂ）のような電源回路を組み合わせて構成される。図３（ｂ）の電源回路は３．５Ｖの電源の正側に抵抗Ｒ１１を、負側に抵抗Ｒ１２をそれぞれ接続し、抵抗Ｒ１１と抵抗Ｒ１３の接続ノードをオペアンプＡの負入力端子Ａａに接続し、抵抗Ｒ１２と抵抗Ｒ１４の接続ノードをオペアンプＡの正入力端子Ａｂに接続している。また、抵抗Ｒ１３の他端をオペアンプＡの出力端子Ａｃと端子１７に接続し、抵抗Ｒ１４の他端を端子１８を介して２Ｖの電源の正側に接続する。更に、前記３．５Ｖの電源と前記２Ｖの電源の負側を接地する。このとき、端子１７と端子１８との電位差をＶ１１とし、端子１７とグランド間にかかる電圧をＶ１２とする。
【００２８】
図３（ｂ）のような構成の回路において、図３（ｃ）のように端子Ｃａ、Ｃｂ、Ｃｃ、Ｃｄにかかる電位をそれぞれＶ２１、Ｖ２２、Ｖ２３、Ｖ２４とし、Ｖ２１−Ｖ２２＝Ｖ２３−Ｖ２４という関係が成り立つとすると、Ｖ１１は３．５Ｖとなり、Ｖ１２はＶ１２＝Ｖ１１＋２より５．５Ｖとなる。
【００２９】
よって、前記コントローラ１６の出力端子１６ａ、１６ｃ間の電位差をＶ１、同じく出力端子１６ｂ、１６ｃ間の電位差をＶ２、前記バッテリー保護回路１の端子２、３、４の電位をＶａ、Ｖｂ、Ｖｃとそれぞれ定めると、図３（ａ）のような電源回路を用いたときＶａ＝Ｖｂ＋Ｖ１、Ｖｂ＝Ｖｃ＋Ｖ２となり、２次電池を直列に接続したときと同様の状態の電圧を端子１６ａ〜１６ｃにかけることができる。
【００３０】
また、前記試験装置において使用する前記定電流電源１４、１５は、実際に前記電池保護回路１を２次電池に接続したときに流れる１〜１０Ａの電流を供給が可能な電源で、かつ、その電源から流れる電流の方向を、定電流電源１４の場合は、端子２→端子５及び端子５→端子２（定電流電源１５の場合は、端子４→端子６及び端子６→端子４）のそれぞれの方向に変換することが可能であるような電源である。また、該定電流電源１４、１５によってかかる電圧は、０．１Ｖまでの低電圧である。
【００３１】
定電流電源１４、１５の構成についてその一例を、図４を用いて説明する。該定電流電源１４、１５は、それぞれ定電流を供給する電流源２０、２１を有し、また、定電流電源１４の３点接続のスイッチ２２、２３はそれぞれ前記電池保護回路１の端子２、端子５に接続し、定電流電源１５の３点接続のスイッチ２４、２５はそれぞれ前記電池保護回路１の端子４、端子６に接続している。また、前記スイッチ２２、２３の３接点の内、それぞれ２接点が前記電流源２０と接続している。また、前記スイッチ２４、２５についても同様に、該スイッチの３接点の内、それぞれ２接点が前記電流源２１に接続している。
【００３２】
これらのスイッチ２２〜２５の接点の内電流源２０、２１と接続した側の接点は、それぞれ、接点ａと接点ｄとが、接点ｂと接点ｃとが、接点ｅと接点ｈとが、接点ｆと接点ｇとが接続している。また、前記電流源２０は接点ａ→接点ｃ（接点ｄ→接点ｂ）の方向に、同じく前記電流源２１は接点ｅ→接点ｇ（接点ｈ→接点ｆ）の方向に電流が常に流れている。
【００３３】
上記のように接続された定電流電源１４、１５によると、定電流電源１４内の前記スイッチ２２を接点ａ側に、前記スイッチ２３を接点ｃ側にそれぞれ接続するとともに、定電流電源１５内の前記スイッチ２４を接点ｆ側に、前記スイッチ２５を接点ｈ側にそれぞれ接続する。このとき、前記電池保護回路１で行われる動作は、該電池保護回路１の端子５と端子６に充電装置を接続したときと同様の動作となる。すなわち、２次電池を充電するときの動作が正常に行われているか否かを試験していることになる。
【００３４】
逆に、定電流電源１４内の前記スイッチ２２を接点ｂ側に、前記スイッチ２３を接点ｄ側にそえぞれ接続するとともに、定電流電源１５内の前記スイッチ２４を接点ｅ側に、前記スイッチ２５を接点ｇ側にそれぞれ接続する。このとき、前記電池保護回路１で行われる動作は、該電池保護回路１の端子５と端子６に大容量の負荷を接続したときと同様の動作となる。すなわち、２次電池を放電するときの動作が正常に行われているか否かを試験していることになる。
【００３５】
【発明の効果】
本発明の電池保護回路の試験方法によれば、該電池保護回路に接続している定電流電源の正負をつなぎ変えるだけで、充電時、放電時の試験を行うことができるので、充電装置や負荷を該電池保護回路に接続する必要がなくなる。
【００３６】
本発明の電池保護回路の試験方法によれば、該電池保護回路に電圧供給する電源が供給する電流は該電池保護回路が該電源によってかかる電圧を検知するのに十分な大きさの電流でよいので、前記電源をオペアンプを用いたような小容量の電源回路で構成することができる。
【００３７】
また、本発明の電池保護回路の試験方法によれば、該電池保護回路に電圧供給する電源が供給する電流は該電池保護回路が該電源によってかかる電圧を検知するのに十分な大きさの電流でよく、また、試験電流を供給する定電流電源が出力制御部や電流検出部にかける電圧も該電池保護回路が動作するのに必要な低い電圧で十分なので、該電池保護回路の試験装置が消費する消費電力が小さくなる。
【００３８】
また、本発明の電池保護回路の試験方法によれば、試験装置が消費する消費電力が小さくなるので、該試験方法で使用される試験装置が小規模ですむ。
【００３９】
また、本発明の電池保護回路の試験方法によれば、充電時や放電時の電流を擬似的に該電池保護回路に流すための定電流電源と、該電池保護回路に接続される充電池の電圧を擬似的に供給するための電源とが別になっているため、従来のように前記充電池の電圧によって充電装置や負荷を変えるというように、該試験方法を行う装置の構成を大きく変化させる必要がないので、該装置の汎用性がある。
【図面の簡単な説明】
【図１】電池保護回路のブロック図。
【図２】本発明の電池保護回路の試験を行うための装置のブロック図。
【図３】電池保護回路の制御部を動作させるための電源回路。
【図４】電池保護回路に定電流を供給するための定電流電源内部の回路図。
【図５】従来の電池保護回路の試験を行うための装置のブロック図。
【符号の説明】
１ 電池保護回路
２〜６ 端子
７ 保護ＩＣ
８ バイポーラ電源
９ バイポーラ電源
１０ スイッチ
１１ 充電装置
１２ 大容量の負荷
１３ 電源回路
１４ 定電流電源
１５ 定電流電源
１６ コントローラ
２０ 電流源
２１ 電流源
２２〜２５ スイッチ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a battery protection circuit test method for testing whether or not a battery protection circuit for protecting a chargeable / dischargeable battery operates normally.
[0002]
[Prior art]
A conventional battery protection circuit will be described with reference to FIGS. FIG. 1 is a block diagram showing the configuration of the battery protection circuit. The battery protection circuit 1 includes terminals 2 to 6, N-channel MOSFET transistors Q1 and Q2 connected in series between the terminal 2 and the terminal 5, and a current detection resistor R connected between the terminal 4 and the terminal 6. And the potential difference between the terminal 2 and the terminal 3, the potential difference between the terminal 3 and the terminal 4, and the potential difference applied to both ends of the current detection resistor, and if the potential difference is within a normal range, the N-channel MOSFET transistors Q1, Q2 Is a circuit having a protection IC 7 that controls so that both are ON.
[0003]
In the N-channel MOSFET transistors Q1 and Q2, the sources of the transistors Q1 and Q2 are connected to the terminal 2 and the terminal 5, respectively, and the drains of both transistors are connected to each other. The gates of both transistors are connected to the protection IC 7.
[0004]
The battery protection circuit 1 includes the current detection resistor R and the N-channel MOSFET transistors Q1 and Q2 connected in series between the terminal 2 and the terminal 5 or between the terminal 4 and the terminal 6. A battery protection circuit having a configuration as connected may be used.
[0005]
In the battery protection circuit 1 having such a configuration, the secondary battery B1 is connected between the terminal 2 and the terminal 3, and the secondary battery B2 is connected between the terminal 3 and the terminal 4. When one of the voltages of the secondary batteries B1 and B2 falls below the normal range at the time of discharge, the protection IC 7 performs an overdischarge protection action, lowers the gate voltage of the transistor Q2, and stops the operation of the transistor Q2. This cuts the discharge current.
[0006]
On the other hand, when the voltage of either of the secondary batteries B1 and B2 exceeds the normal range during charging, the overcharge protection function is activated by the protection IC 7, and the gate voltage of the transistor Q1 is lowered to reduce the transistor Q1. The charging current is cut by stopping the operation.
[0007]
Further, when an overcurrent flows through the current detection resistor R during charging and discharging, and the potential difference applied to both ends of the resistor R exceeds the normal range, overcurrent protection is activated by the protection IC 7, and the operation of the transistor Q1 is performed during charging. Is stopped to cut the charging current, and when discharging, the operation of the transistor Q2 is stopped to cut the discharging current.
[0008]
FIG. 5 is a block diagram showing a conventional test apparatus for performing a test for confirming the operation of the battery protection circuit 1. Bipolar power supplies 8 and 9 are connected as pseudo power supplies of the secondary battery for charging / discharging between the terminals 2 and 3 of the battery protection circuit 1 and between the terminals 3 and 4, and the switch 10 is connected to the terminal 5. Are connected, a charging device 11 is connected between the contact 10a of the switch 10 and the terminal 6, and a large-capacity load 12 having a variable load size is connected between the contact 10b of the switch 10 and the terminal 6. ing.
[0009]
Hereinafter, each of the conventional overdischarge test, overcharge test, and overcurrent test using the test apparatus configured as described above will be described.
[0010]
In the overdischarge test, first, the switch 10 is set on the contact 10b side, and the battery protection circuit 1 and the load 12 are connected so that the secondary battery performs a discharge operation. At this time, the voltage of the bipolar power supply 8 or 9 is lowered with the discharge current ID flowing, and it is checked whether or not the discharge current ID is cut when the voltage falls below the normal range.
[0011]
The overcharge test is first set on the contact 10a side of the switch 10, and the battery protection circuit 1 and the charging device 11 are connected so that the secondary battery performs a charging operation. At this time, the voltage of the bipolar power supply 8 or 9 is increased with the charging current IC flowing, and it is confirmed whether or not the charging current IC is cut when the voltage exceeds the normal range.
[0012]
In the overcurrent test, the switch 10 is set on the contact 10b side so that a discharge current flows into the battery protection circuit 1. At this time, the voltage of the bipolar power supplies 8 and 9 is controlled to a normal range voltage, and the discharge current flowing into the battery protection circuit 1 is increased by operating the load 12 connected to the battery protection circuit 1. When the current exceeds the normal range, it is confirmed whether or not the current is cut.
[0013]
In addition, since it is extremely rare for an overcurrent to flow while the secondary battery is being charged, an overcurrent test in a charged state is generally not performed.
[0014]
[Problems to be solved by the invention]
In the case of the conventional battery protection circuit test method, since the test is performed by connecting an actual load to the battery protection circuit 1 as described above, the power for actual use is transferred from the test apparatus to the harmful battery protection circuit 1. It is necessary to supply.
[0015]
The electric power required for use in the test method is necessary to further perform the test to a voltage 4NV obtained by multiplying the number N of the rechargeable batteries connected in series by the voltage 4V of the rechargeable battery. A large power of 4N to 40NW is obtained by multiplying the test currents 1 to 10A. For this reason, the bipolar power supply device used in the test method also requires a power supply that supplies such a large amount of power, so that a device with a large capacity is required.
[0016]
Further, in this test method, not only a bipolar power supply device with a large capacity is required for the bipolar power supplies 8 and 9, but also the bipolar power supplies 8 and 9 are used to simulate charging through the battery protection circuit 1. Since the charging device 11 for discharging and the large-capacity load 12 are also required, the test device used in the test method is large-scale.
[0017]
Therefore, an object of the present invention is to provide a battery protection circuit test method in which a power source connected to the battery protection circuit 1 requires a small capacity.
[0018]
Another object of the present invention is to provide a test method for a battery protection circuit that can be tested with a small-scale test apparatus.
[0019]
Further, according to the conventional test method, the battery protection is performed on the assumption that the number of secondary batteries connected in series in actual use changes and the voltage applied to the battery protection circuit 1 changes. When the bipolar power supplies 8 and 9 having different set voltages are connected to the circuit 1, the connected charging device 11 and the large-capacity load 12 must be changed to those having different capacities. For this reason, the charging device 11 and the large-capacity load 12 need to be various, and the test device must be recombined each time the set voltage of the bipolar power supply is changed.
[0020]
In the present invention, in view of the above problem, it is not necessary to rearrange the test apparatus each time the magnitude of the set voltage supplied from the power source connected to the battery protection circuit 1 is changed, and the switching of the battery protection circuit 1 is performed. It is an object of the present invention to provide a test method for a battery protection circuit using a versatile test apparatus that can test whether a control operation is normally performed.
[0021]
[Means for Solving the Problems]
The battery protection circuit testing method of the present invention includes a secondary battery connection terminal to which a chargeable / dischargeable secondary battery is connected, a load connection terminal to which a load or a charging device is connected, and a voltage value of the secondary battery. A voltage detection unit to detect, a current detection unit to detect a current value flowing from the secondary battery, and a voltage value detected by the voltage detection unit is higher than a predetermined voltage value or detected by the current detection unit In a battery protection circuit test method for testing whether or not a battery protection circuit having an output control unit that cuts off a charging / discharging path of the secondary battery when a current value exceeds a predetermined current value is operating normally A power source for supplying a test voltage to the secondary battery connection terminal of the battery protection circuit, and a constant current power source for supplying a test current between the secondary battery connection terminal and the load connection terminal of the battery protection circuit. Instead of the battery protection circuit And performing connected.
[0022]
According to the test method of the battery protection circuit performed in such a configuration, it is not necessary to connect a load or a charging device that is actually used to the load connection terminal of the battery protection circuit unlike the conventional test method. Also, the current consumed by the test equipment is reduced by reducing the value of the current flowing through the power source connected to the secondary battery connection terminal and lowering the voltage applied to the constant current power source connected between the secondary battery connection terminal and the load connection terminal. Suppress power.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIGS. FIG. 2 is a block diagram showing a configuration of a test apparatus for confirming the operation of the battery protection circuit 1. FIG. 3 shows an example of a circuit diagram of the power supply circuit 13 of FIG. FIG. 4 is a simple circuit diagram showing the internal configuration of the constant current power supplies 14 and 15 of FIG.
[0024]
In the present embodiment, the battery protection circuit 1 shown in FIG. 1 will be described as a test target. Similar to the conventional test method, the current detection resistor R and the N-channel MOSFET transistors Q1 and Q2 other than the battery protection circuit shown in FIG. 1 are connected between the terminal 2 and the terminal 5 or between the terminal 4 and the terminal. A battery protection circuit that is connected in series with the battery 6 may be the test target.
[0025]
As shown in FIG. 2, a power supply circuit 13 is connected to terminals 2 to 4 of the battery protection circuit 1, and between the terminals 2 and 5 of the battery protection circuit 1 and between the terminals 4 and 6. Are connected to constant current power supplies 14 and 15, respectively. The power supply circuit 13 used at this time supplies the voltage at the time of charging / discharging when the battery protection circuit 1 is actually connected to the secondary battery, and up to 1 mA sufficient to operate the battery protection circuit 1. This is a power supply circuit that supplies a small amount of current.
[0026]
An example in which an operational amplifier is used in such a power supply circuit 13 will be described with reference to FIG. A resistor R1 is connected to the output terminal 16a of the controller 16, a resistor R5 is connected to the output terminal 16b, and resistors R3 and R7 are connected to the output terminal 16c. Further, a connection node between the resistors R1 and R2 is connected to the negative input terminal A1a of the operational amplifier A1, and a connection node between the resistors R3 and R4 is connected to the positive input terminal A1b of the operational amplifier. A connection node between the resistors R5 and R6 is connected to the negative input terminal A2a of the operational amplifier A2, and a connection node between the resistors R7 and R8 is connected to the positive input terminal A2b of the operational amplifier A2. The other end of the resistor R2 is connected to the output terminal A1c of the operational amplifier A1 and the terminal 2 of the battery protection circuit 1, and the other end of the resistor R4 and the other end of the resistor R6 are connected to the output terminal A2c of the operational amplifier A2. , Connected to the terminal 3 of the battery protection circuit 1. Further, the other end of the resistor R8 is connected to the terminal 4 of the battery protection circuit 1.
[0027]
The power supply circuit 13 as described above is configured by combining power supply circuits as shown in FIG. In the power supply circuit of FIG. 3B, the resistor R11 is connected to the positive side of the 3.5V power supply, the resistor R12 is connected to the negative side, and the connection node of the resistors R11 and R13 is connected to the negative input terminal Aa of the operational amplifier A. The connection node between the resistor R12 and the resistor R14 is connected to the positive input terminal Ab of the operational amplifier A. The other end of the resistor R13 is connected to the output terminal Ac and the terminal 17 of the operational amplifier A, and the other end of the resistor R14 is connected to the positive side of the 2V power source via the terminal 18. Further, the negative side of the 3.5 V power source and the 2 V power source is grounded. At this time, the potential difference between the terminal 17 and the terminal 18 is V11, and the voltage applied between the terminal 17 and the ground is V12.
[0028]
In the circuit configured as shown in FIG. 3B, the potentials applied to the terminals Ca, Cb, Cc, and Cd are V21, V22, V23, and V24, respectively, as shown in FIG. 3C, and V21−V22 = V23−V24. If this relationship is established, V11 becomes 3.5V, and V12 becomes 5.5V from V12 = V11 + 2.
[0029]
Therefore, the potential difference between the output terminals 16a and 16c of the controller 16 is V1, the potential difference between the output terminals 16b and 16c is V2, and the potentials of the terminals 2, 3, and 4 of the battery protection circuit 1 are Va, Vb, and Vc. When each is determined, when a power supply circuit as shown in FIG. 3A is used, Va = Vb + V1 and Vb = Vc + V2 are obtained, and a voltage in the same state as when a secondary battery is connected in series is applied to the terminals 16a to 16c. Can do.
[0030]
The constant current power supplies 14 and 15 used in the test apparatus are power supplies capable of supplying a current of 1 to 10 A that flows when the battery protection circuit 1 is actually connected to a secondary battery, and The direction of the current flowing from the power source is as follows: terminal 2 → terminal 5 and terminal 5 → terminal 2 (in the case of constant current power supply 15, terminal 4 → terminal 6 and terminal 6 → terminal 4) in the case of constant current power source 14. It is a power supply that can be converted to the direction of The voltage applied by the constant current power supplies 14 and 15 is a low voltage up to 0.1V.
[0031]
An example of the configuration of the constant current power supplies 14 and 15 will be described with reference to FIG. The constant current power supplies 14 and 15 have current sources 20 and 21 for supplying a constant current, respectively, and the three-point connection switches 22 and 23 of the constant current power supply 14 are respectively connected to the terminal 2 of the battery protection circuit 1. The switches 24 and 25 connected to the terminal 5 and connected to the three points of the constant current power supply 15 are connected to the terminals 4 and 6 of the battery protection circuit 1, respectively. Also, two of the three contacts of the switches 22 and 23 are connected to the current source 20. Similarly for the switches 24 and 25, two of the three contacts of the switches are connected to the current source 21, respectively.
[0032]
The contacts on the side connected to the current sources 20 and 21 of the contacts of these switches 22 to 25 are the contact a and the contact d, the contact b and the contact c, the contact e and the contact h, respectively. f and contact g are connected. The current source 20 always flows in the direction of contact a → contact c (contact d → contact b), and similarly, the current source 21 constantly flows in the direction of contact e → contact g (contact h → contact f). .
[0033]
According to the constant current power supplies 14 and 15 connected as described above, the switch 22 in the constant current power supply 14 is connected to the contact a side and the switch 23 is connected to the contact c side. The switch 24 is connected to the contact f side, and the switch 25 is connected to the contact h side. At this time, the operation performed in the battery protection circuit 1 is the same as that when the charging device is connected to the terminal 5 and the terminal 6 of the battery protection circuit 1. That is, it is tested whether the operation when charging the secondary battery is normally performed.
[0034]
Conversely, the switch 22 in the constant current power supply 14 is connected to the contact b side, the switch 23 is connected to the contact d side, and the switch 24 in the constant current power supply 15 is connected to the contact e side. 25 is connected to the contact g side. At this time, the operation performed by the battery protection circuit 1 is the same as that when a large-capacity load is connected to the terminal 5 and the terminal 6 of the battery protection circuit 1. That is, it is tested whether or not the operation when discharging the secondary battery is performed normally.
[0035]
【The invention's effect】
According to the battery protection circuit test method of the present invention, it is possible to perform tests at the time of charging and discharging simply by changing the polarity of the constant current power source connected to the battery protection circuit. There is no need to connect a load to the battery protection circuit.
[0036]
According to the test method for the battery protection circuit of the present invention, the current supplied by the power supply for supplying voltage to the battery protection circuit may be a current large enough for the battery protection circuit to detect the voltage applied by the power supply. Therefore, the power source can be constituted by a small-capacity power circuit using an operational amplifier.
[0037]
Further, according to the battery protection circuit testing method of the present invention, the current supplied by the power supply for supplying voltage to the battery protection circuit is a current that is large enough for the battery protection circuit to detect the voltage applied by the power supply. In addition, the voltage applied to the output control unit and the current detection unit by the constant current power source for supplying the test current is sufficient as the low voltage necessary for the battery protection circuit to operate. Power consumption is reduced.
[0038]
In addition, according to the test method of the battery protection circuit of the present invention, the power consumption consumed by the test apparatus is reduced, so that the test apparatus used in the test method can be small.
[0039]
Further, according to the battery protection circuit testing method of the present invention, a constant current power source for artificially flowing a current during charging or discharging to the battery protection circuit, and a rechargeable battery connected to the battery protection circuit Since the power supply for artificially supplying the voltage is separate, the configuration of the apparatus for performing the test method is greatly changed, such as changing the charging apparatus and the load depending on the voltage of the rechargeable battery as in the past. Since it is not necessary, the apparatus has versatility.
[Brief description of the drawings]
FIG. 1 is a block diagram of a battery protection circuit.
FIG. 2 is a block diagram of an apparatus for testing a battery protection circuit of the present invention.
FIG. 3 is a power supply circuit for operating a control unit of the battery protection circuit.
FIG. 4 is a circuit diagram of a constant current power source for supplying a constant current to the battery protection circuit.
FIG. 5 is a block diagram of an apparatus for testing a conventional battery protection circuit.
[Explanation of symbols]
1 Battery protection circuit 2-6 Terminal 7 Protection IC
8 Bipolar Power Supply 9 Bipolar Power Supply 10 Switch 11 Charging Device 12 Large Capacity Load 13 Power Supply Circuit 14 Constant Current Power Supply 15 Constant Current Power Supply 16 Controller 20 Current Source 21 Current Sources 22-25 Switch

Claims (1)

充放電可能な２次電池が接続される２次電池接続端子と、負荷又は充電装置が接続される負荷接続端子と、前記２次電池の電圧値を検出する電圧検出部と、前記２次電池から流れる電流値を検出する電流検出部と、前記電圧検出部で検出した電圧値が所定の電圧値より高くなるかもしくは低くなるか、または前記電流検出部で検出した電流値が所定の電流値を超えたときに前記２次電池の充放電路を遮断する出力制御部とを有する電池保護回路が正常に働いているか否かを試験する電池保護回路の試験方法において、
前記電池保護回路の２次電池接続端子に試験電圧を供給する電源と、
前記電池保護回路の２次電池接続端子と負荷接続端子間に試験電流を供給する定電流電源とを
前記２次電池の代わりに前記電池保護回路に接続して行うことを特徴とする電池保護回路の試験方法。A secondary battery connection terminal to which a chargeable / dischargeable secondary battery is connected; a load connection terminal to which a load or a charging device is connected; a voltage detection unit for detecting a voltage value of the secondary battery; and the secondary battery. A current detection unit that detects a current value flowing from the current detection unit, and a voltage value detected by the voltage detection unit is higher or lower than a predetermined voltage value, or a current value detected by the current detection unit is a predetermined current value In the test method of the battery protection circuit for testing whether or not the battery protection circuit having the output control unit that cuts off the charge / discharge path of the secondary battery when it exceeds the limit,
A power supply for supplying a test voltage to a secondary battery connection terminal of the battery protection circuit;
A battery protection circuit comprising a constant current power source for supplying a test current between a secondary battery connection terminal and a load connection terminal of the battery protection circuit connected to the battery protection circuit instead of the secondary battery. Test method.
JP21219898A 1998-07-28 1998-07-28 Battery protection circuit power saving measurement method Expired - Fee Related JP3657119B2 (en)

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JP4795082B2 (en) * 2006-04-10 2011-10-19 パナソニック株式会社 Inspection circuit, battery pack and battery pack unit
CN101527448B (en) * 2009-04-21 2014-07-02 无锡中星微电子有限公司 Battery protection circuit, testing device and method for battery protection circuit
KR101005851B1 (en) 2009-04-29 2011-01-05 김권중 Overcurrent Testing Apparatus of Battery Multi Cell Protection Circuit with Serial Loop
CN103728547A (en) * 2012-10-12 2014-04-16 技嘉科技股份有限公司 Testing system used for testing circuit board and leakage current testing method
CN103545896B (en) * 2013-11-07 2015-09-30 成都芯源系统有限公司 Bidirectional switch circuit, mobile power supply circuit and control method thereof
JP2015100213A (en) * 2013-11-19 2015-05-28 蔡富生 Method and apparatus for executing battery cell control with support of virtual battery mechanism
CN104931839B (en) * 2015-06-30 2018-05-29 河北工业大学 A kind of battery protection plate detector
KR102338637B1 (en) 2018-09-30 2021-12-13 광동 오포 모바일 텔레커뮤니케이션즈 코포레이션 리미티드 Test system and method of charging device
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