JP2005032664A - Battery pack with charging protective circuit - Google Patents

Battery pack with charging protective circuit Download PDF

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JP2005032664A
JP2005032664A JP2003272829A JP2003272829A JP2005032664A JP 2005032664 A JP2005032664 A JP 2005032664A JP 2003272829 A JP2003272829 A JP 2003272829A JP 2003272829 A JP2003272829 A JP 2003272829A JP 2005032664 A JP2005032664 A JP 2005032664A
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circuit
battery pack
charging
bias
dedicated charger
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JP4014099B2 (en
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Shin Suzuki
伸 鈴木
Kazuhisa Nagase
和久 永瀬
Shuji Shibata
周司 柴田
Shingo Takahashi
真吾 高橋
Koichi Zama
浩一 座間
Hideto Watanabe
英人 渡辺
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Tokin Corp
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NEC Tokin Tochigi Ltd
NEC Tokin Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery pack with a charging protective circuit, capable of performing charging protection without using a protective IC of high power consumption, which saves power, and reducing the number of components in a simple circuit, while miniaturizing the battery pack and reducing its cost. <P>SOLUTION: This battery pack with the charging protective circuit has a lithium ion battery B built-in, to which a charging control switch FET is connected in series, and is provided with a circuit to identify other connections than the connection to a dedicated charger to protect the battery pack. It is also provided with a control terminal Pc to connect to the dedicated charger 2, the charging protective circuits S1, S2 to control ON/OFF of the charging control switch FET by supplying a bias from the dedicated charger 2 connected to the control terminal Pc. Thereby, ON/OFF of the charging control switch FET can be controlled by supplying the bias only when the dedicated charger 2 is connected, in a simple circuit structure having the reduced number of components, and under the condition in which the dedicated charger 2 is not connected, no power is supplied to the charging protective circuit. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、充電制御用スイッチを直列に接続したリチウムイオン電池を内蔵し専用充電器以外の接続を識別し保護する回路を備えた充電保護回路付き電池パックに関する。   The present invention relates to a battery pack with a charge protection circuit including a lithium ion battery in which a charge control switch is connected in series, and a circuit for identifying and protecting a connection other than a dedicated charger.

小型化、軽量化を進めている電子機器や携帯機器の電源として、リチウムイオン電池が使われ、その需要の拡大と共に開発、改良も積極的に推進されている。一般にリチウムイオン電池を内蔵した電池パックには、繰り返し充電をして利用するが、定格から外れた電圧での充電や過充電を繰り返し行うと、性能劣化や破壊が生じやすくなるため、専用の充電器が用意される（例えば、特許文献１、２参照）。
特開平１１−９８７１４号公報 特開平１１−１８７５８８号公報 Lithium-ion batteries are used as power sources for electronic and portable devices that are becoming smaller and lighter, and development and improvement are actively promoted as demand grows. In general, battery packs with built-in lithium-ion batteries are used by repeatedly charging them. However, repeated charging or overcharging at a voltage outside the rating tends to cause performance deterioration or destruction. A device is prepared (see, for example, Patent Documents 1 and 2).
Japanese Patent Application Laid-Open No. 11-98714 Japanese Patent Laid-Open No. 11-187588

従来の専用充電器もしくは専用本体により電圧検出、充電状態の検出、制御を行い充電停止の動作を行うためには、電池パックを取り外して充電を行う場合、保護ＩＣを内蔵した単体であれば、間違って別の機器により充放電されても、内蔵した保護ＩＣの動作により電池を保護することができる。しかし、保護ＩＣを内蔵した電池パックでは、保護ＩＣが電力を消費し、部品点数もそれなりに多くコストも高くなるなどの問題を有している。さらに保護回路を内臓した単体以外では、取り外しを行うと、間違って別の機器により充放電されても電池を保護することができないため、別の機器により充放電される恐れから分離独立することができなかった。   In order to perform the operation of stopping the charge by detecting the voltage, detecting the state of charge and controlling it with the conventional dedicated charger or the main body, when removing the battery pack and charging, if it is a single unit with a built-in protection IC, Even if it is charged and discharged by another device by mistake, the battery can be protected by the operation of the built-in protection IC. However, the battery pack with the built-in protection IC has a problem that the protection IC consumes electric power, and the number of parts is large and the cost is high. In addition, if you remove the battery other than a single unit that has a built-in protection circuit, the battery cannot be protected even if it is accidentally charged or discharged by another device. could not.

本発明は、上記課題を解決するものであって、電力を消費する保護ＩＣを使うことなく、無電力化して簡単な回路で部品点数を低減し、小型化、低コスト化を図りつつ充電保護を行えるようにするものである。   The present invention solves the above-described problem, and without using a protection IC that consumes power, reduces the number of parts with a simple circuit without power consumption, and reduces the number of components, while reducing the size and cost. It is to be able to do.

そなために本発明は、充電制御用スイッチを直列に接続したリチウムイオン電池を内蔵し専用充電器以外の接続を識別し保護する回路を備えた充電保護回路付き電池パックであって、前記専用充電器に接続する制御端子と、該制御端子に接続された前記専用充電器からのバイアスの供給により前記充電制御用スイッチのオン／オフを制御する充電保護回路とを備えたことを特徴とする。   Therefore, the present invention is a battery pack with a charge protection circuit that includes a lithium ion battery in which a switch for charge control is connected in series and has a circuit for identifying and protecting a connection other than a dedicated charger. A control terminal connected to the charger, and a charge protection circuit that controls on / off of the charge control switch by supplying a bias from the dedicated charger connected to the control terminal. .

前記充電保護回路は、前記専用充電器からバイアスを供給する回路に定電圧素子を挿入接続し、前記制御端子に接続された前記専用充電器からバイアスが供給されオン／オフするスイッチ回路と、該スイッチ回路のオン／オフにより前記充電制御用スイッチのオン／オフを制御する回路とを有することを特徴とする。   The charge protection circuit includes a switch circuit that inserts and connects a constant voltage element to a circuit that supplies a bias from the dedicated charger, and that is supplied with a bias from the dedicated charger connected to the control terminal and is turned on / off; And a circuit for controlling on / off of the charge control switch by turning on / off the switch circuit.

さらに、前記スイッチ回路は、前記充電制御用スイッチのバイアス回路を形成するものであり、前記充電制御用スイッチのバイアス回路を短絡するものであり、前記充電保護回路は、前記専用充電器の一方の充電ラインとの間に前記充電制御用スイッチをオンに制御するバイアス回路を有し、前記バイアス回路は、前記一方の充電ラインに接続されたときオンになるスイッチ回路により形成されることを特徴とする。   Further, the switch circuit forms a bias circuit for the charge control switch, short-circuits the bias circuit for the charge control switch, and the charge protection circuit is one of the dedicated chargers. A bias circuit that controls the charging control switch to be turned on between the charging line and the charging line; and the bias circuit is formed by a switch circuit that is turned on when connected to the one charging line. To do.

以上の説明から明らかなように、本発明によれば、充電制御用スイッチを直列に接続したリチウムイオン電池を内蔵し専用充電器以外の接続を識別し保護する回路を備えた充電保護回路付き電池パックであって、専用充電器に接続する制御端子と、該制御端子に接続された専用充電器からのバイアスの供給により充電制御用スイッチのオン／オフを制御する充電保護回路とを備えたので、部品点数を少なくした簡単な回路構成で専用充電器を接続してはじめてバイアスを供給し充電制御用スイッチのオン／オフを制御できるようにし、専用充電器の非接続状態では、充電保護回路を無電力化とすることができる。したがって、電力を消費する保護ＩＣを使うことなく、無電力化して簡単な回路で部品点数を低減し、小型化、低コスト化を図りつつ充電保護を行うことができる。   As is apparent from the above description, according to the present invention, a battery with a charge protection circuit including a lithium ion battery having a charge control switch connected in series and having a circuit for identifying and protecting a connection other than a dedicated charger. The pack includes a control terminal connected to the dedicated charger and a charge protection circuit that controls on / off of the charge control switch by supplying a bias from the dedicated charger connected to the control terminal. Only when a dedicated charger is connected with a simple circuit configuration with a reduced number of parts, it is possible to control the on / off of the charge control switch by supplying a bias, and when the dedicated charger is not connected, the charge protection circuit is There can be no power consumption. Therefore, without using a protection IC that consumes power, it is possible to perform power protection while reducing power consumption and reducing the number of parts with a simple circuit, and achieving downsizing and cost reduction.

充電保護回路は、専用充電器からバイアスを供給する回路に定電圧素子を挿入接続するので、定格電圧に合っていない低電圧での充電器からの充電に対し充電を阻止して保護を行うことができ、制御端子に接続された専用充電器からバイアスが供給されオン／オフするスイッチ回路と、該スイッチ回路のオン／オフにより充電制御用スイッチのオン／オフを制御する回路とを有するので、専用充電器からバイアスの供給により簡単に充電制御用スイッチのオン／オフの制御、過充電の保護を行うことができる。   The charge protection circuit inserts and connects a constant voltage element to the circuit that supplies the bias from the dedicated charger, so protection against charging from a charger at a low voltage that does not match the rated voltage should be protected. A switch circuit that is turned on / off by a bias supplied from a dedicated charger connected to the control terminal, and a circuit that controls on / off of the charge control switch by turning on / off the switch circuit, By supplying a bias from the dedicated charger, it is possible to easily control on / off of the charge control switch and to protect overcharge.

さらに、スイッチ回路は、充電制御用スイッチのバイアス回路を形成するものであり、充電制御用スイッチのバイアス回路を短絡するものであり、充電保護回路は、専用充電器の一方の充電ラインとの間に充電制御用スイッチをオンに制御するバイアス回路を有し、バイアス回路は、一方の充電ラインに接続されたときオンになるスイッチ回路により形成されるので、本発明は、電力消費を必要とする集積回路（保護ＩＣ）を必要としない上に、充電器からの電源を利用して動作することにより、理想上の無電力化が可能となる。また、回路の簡略化による小型化、部品点数の低減による低価格化が実現できる。   Further, the switch circuit forms a bias circuit for the charge control switch, short-circuits the bias circuit for the charge control switch, and the charge protection circuit is connected to one charge line of the dedicated charger. The present invention has a bias circuit for controlling the charging control switch to be turned on, and the bias circuit is formed by a switch circuit that is turned on when connected to one of the charging lines. Therefore, the present invention requires power consumption. An integrated circuit (protection IC) is not required, and by operating using a power source from a charger, ideal power saving can be achieved. In addition, it is possible to reduce the size by simplifying the circuit and reducing the number of parts.

本発明によれば、専用充電器でのみスイッチの開閉を行う方式を用いることで、本体から分離独立しても安全性を確保した状態が可能になり、小型、省電力、低価格化を可能とする回路の提供が可能になった。   According to the present invention, by using a system that opens and closes a switch only with a dedicated charger, it is possible to ensure safety even when separated and independent from the main body, and it is possible to reduce size, power consumption, and cost. It has become possible to provide a circuit.

以下、本発明の実施の形態を図面を参照しつつ説明する。図１は本発明に係る充電保護回路付き電池パックの実施の形態を示す図、図２はトランジスタによりスイッチ回路を構成した例を示す図であり、１は電池パック部、２は専用充電器、Ｂはリチウムイオン電池、ＦＥＴは充電制御用スイッチ、Ｓ１、Ｓ２はスイッチ回路、Ｔｒ１、Ｔｒ２はトランジスタ、Ｒ１〜Ｒ７は抵抗、Ｐｃ１〜Ｐｃ３は制御端子を示す。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing an embodiment of a battery pack with a charge protection circuit according to the present invention, FIG. 2 is a diagram showing an example in which a switch circuit is configured by transistors, 1 is a battery pack unit, 2 is a dedicated charger, B is a lithium ion battery, FET is a charge control switch, S1 and S2 are switch circuits, Tr1 and Tr2 are transistors, R1 to R7 are resistors, and Pc1 to Pc3 are control terminals.

図１において、電池パック部１は、充電制御用スイッチＦＥＴを直列に接続したリチウムイオン電池Ｂを内蔵し、スイッチ回路Ｓ１、Ｓ２と抵抗Ｒ１〜Ｒ７からなり専用充電器以外の接続を識別し保護する回路を備えた充電保護回路付き電池パックである。充電制御用スイッチＦＥＴは、電界効果トランジスタからなるスイッチであり、リチウムイオン電池Ｂの端子間に接続されている抵抗Ｒ１とスイッチ回路Ｓ２からなる直列回路により動作バイアスが供給されている。   In FIG. 1, a battery pack unit 1 includes a lithium ion battery B in which charge control switch FETs are connected in series, and includes switch circuits S1 and S2 and resistors R1 to R7 to identify and protect connections other than a dedicated charger. A battery pack with a charge protection circuit. The charge control switch FET is a switch made of a field effect transistor, and an operation bias is supplied by a series circuit made up of a resistor R1 and a switch circuit S2 connected between terminals of the lithium ion battery B.

スイッチ回路Ｓ１は、充電制御用スイッチＦＥＴにバイアスを印加する回路の抵抗Ｒ１を短絡する回路であり、制御端子Ｐｃ１を介して専用充電器２からバイアスが供給されてオン／オフが制御される。スイッチ回路Ｓ２は、制御端子Ｐｃ２を介して専用充電器２側の一方の充電ラインとの間に抵抗Ｒ４又はＲ５を通してバイアスが供給されてオン／オフが制御されるるものである。   The switch circuit S1 is a circuit that short-circuits a resistor R1 of a circuit that applies a bias to the charge control switch FET, and is supplied with a bias from the dedicated charger 2 via the control terminal Pc1 to be controlled on / off. The switch circuit S2 is controlled to be turned on / off by supplying a bias through a resistor R4 or R5 to one charging line on the side of the dedicated charger 2 via a control terminal Pc2.

抵抗Ｒ２、Ｒ３は、動作電圧を制限するものであり、所定の抵抗値を用いることにより、専用充電器２側から供給されるバイアス電圧が低い場合には、スイッチ回路Ｓ１、Ｓ２の動作を制限する。この抵抗Ｒ２、Ｒ３は、非線形抵抗素子やツェナーダイオードなどの定電圧素子を用いることにより、より安定した動作の制限を行うことができ、不良専用充電器２による充電から電池パックの充電を保護することができる。   The resistors R2 and R3 limit the operating voltage. When a bias voltage supplied from the dedicated charger 2 side is low, the operation of the switch circuits S1 and S2 is limited by using a predetermined resistance value. To do. The resistors R2 and R3 use a constant voltage element such as a non-linear resistance element or a Zener diode, so that more stable operation can be restricted, and the charging of the battery pack is protected from charging by the defective dedicated charger 2. be able to.

したがって、充電制御用スイッチＦＥＴは、スイッチ回路Ｓ２と抵抗Ｒ１によりバイアス回路が形成されるとオンになって充電回路を形成し、スイッチ回路Ｓ１がオンになってバイアスが短絡され、あるいはスイッチ回路Ｓ２がオフになってバイアスが遮断されるとオフになって充電回路を遮断する。   Accordingly, the charge control switch FET is turned on when the bias circuit is formed by the switch circuit S2 and the resistor R1 to form a charge circuit, and the switch circuit S1 is turned on and the bias is short-circuited, or the switch circuit S2 When it is turned off and the bias is cut off, it turns off and cuts off the charging circuit.

スイッチ回路Ｓ１及びＳ２に代えてトランジスタＴｒ１、Ｔｒ２で構成した充電保護回路を構成した具体的な例で示したのが図２である。図２に示す回路では、専用充電器２が電池パック部１に接続されると、制御端子Ｐｃ３を通して抵抗Ｒ１とＲ５がリチウムイオン電池Ｂの端子間に直列接続されて充電制御用スイッチＦＥＴにバイアスが供給され、充電制御用スイッチＦＥＴがオンすることにより、充放電端子Ｐ＋、Ｐ−間の充電回路が形成される。そして、制御端子Ｐｃ１を介して専用充電器２からトランジスタＴｒ１のベースにバイアスが供給されてトランジスタＴｒ１がオンになると、抵抗Ｒ１が短絡されて充電制御用スイッチＦＥＴがオフになり、充電回路は遮断される。   FIG. 2 shows a specific example in which a charge protection circuit including transistors Tr1 and Tr2 is used instead of the switch circuits S1 and S2. In the circuit shown in FIG. 2, when the dedicated charger 2 is connected to the battery pack unit 1, the resistors R1 and R5 are connected in series between the terminals of the lithium ion battery B through the control terminal Pc3 to bias the charge control switch FET. Is supplied, and the charge control switch FET is turned on to form a charging circuit between the charge / discharge terminals P + and P−. When a bias is supplied from the dedicated charger 2 to the base of the transistor Tr1 via the control terminal Pc1 and the transistor Tr1 is turned on, the resistor R1 is short-circuited, the charge control switch FET is turned off, and the charging circuit is cut off. Is done.

また、抵抗Ｒ５の回路を使用しない場合には、オープン端子対Ｐｏ間を電池パック部１で短絡し、あるいはこれらのオープン端子対Ｐｏ間を外部まで引き出して専用充電器２に接続し、専用充電器２側に短絡回路を設けることにより、専用充電器２が電池パック部１に接続されると、トランジスタＴｒ２に抵抗Ｒ５を通して専用充電器２側からベースバイアスを供給して、トランジスタＴｒ２をオンにするように構成してもよい。   Further, when the circuit of the resistor R5 is not used, the open terminal pair Po is short-circuited by the battery pack unit 1, or the open terminal pair Po is pulled out to the outside and connected to the dedicated charger 2 for dedicated charging. When the dedicated charger 2 is connected to the battery pack unit 1 by providing a short circuit on the charger 2 side, a base bias is supplied from the dedicated charger 2 side through the resistor R5 to the transistor Tr2 to turn on the transistor Tr2. You may comprise.

上記のように本実施形態では、回路自体に電源を持てなくても、専用充電器２から供給する電力を利用し、スイッチ回路を外部制御にするシステムと保護動作内蔵の専用充電器２を認識して、スイッチを開閉することにより充電保護を行っている。   As described above, in the present embodiment, even if the circuit itself does not have a power source, the power supplied from the dedicated charger 2 is used to recognize the system for externally controlling the switch circuit and the dedicated charger 2 with a built-in protection operation. Then, charging protection is performed by opening and closing the switch.

本発明によれば、充電制御用スイッチＦＥＴのゲートをオフにラッチしつつ、ゲート駆動用の抵抗を充電器もしくは本体に端子経由で接続する。この時に接続する端子の方式を、単純な接続、抵抗分圧による定数方式、端子部の一定電圧化でのみ駆動するツェナーなど、複数の方式を組み合わせることにより、複雑な端子配分となりより確実に本体を特定することが可能となる。また、ゲート部を外部から強制的にオフ状態へ引き上げるスイッチなどにより充電器もしくは本体から強制的に充電の停止を行うことが可能となる。この他にはも、スイッチを電界効果型やリレーによる方法、端子部をＩＣなどの特定信号検出素子で行うことも可能である。   According to the present invention, the gate driving resistor is connected to the charger or the main body via the terminal while latching the gate of the charge control switch FET off. By combining multiple methods such as a simple connection, a constant method based on resistance voltage division, and a Zener that is driven only with a constant voltage at the terminal, the terminal connection to be connected at this time becomes a complicated terminal distribution and more reliably. Can be specified. In addition, charging can be forcibly stopped from the charger or the main body by a switch or the like forcibly pulling up the gate portion from the outside to the off state. In addition, it is possible to use a field effect type or a relay method for the switch and a specific signal detecting element such as an IC for the terminal portion.

本発明に係る充電保護回路付き電池パックの実施の形態を示す図である。It is a figure which shows embodiment of the battery pack with a charge protection circuit which concerns on this invention. トランジスタによりスイッチ回路を構成した例を示す図である。It is a figure which shows the example which comprised the switch circuit with the transistor.

符号の説明Explanation of symbols

１…電池パック部、２…専用充電器、Ｂ…リチウムイオン電池、ＦＥＴ…充電制御用スイッチ、Ｓ１、Ｓ２…スイッチ回路、Ｔｒ１、Ｔｒ２…トランジスタ、Ｒ１〜Ｒ７…抵抗、Ｐｃ１〜Ｐｃ３…制御端子   DESCRIPTION OF SYMBOLS 1 ... Battery pack part, 2 ... Dedicated charger, B ... Lithium ion battery, FET ... Switch for charge control, S1, S2 ... Switch circuit, Tr1, Tr2 ... Transistor, R1-R7 ... Resistance, Pc1-Pc3 ... Control terminal

Claims (7)

充電制御用スイッチを直列に接続したリチウムイオン電池を内蔵し専用充電器以外の接続を識別し保護する回路を備えた充電保護回路付き電池パックであって、前記専用充電器に接続する制御端子と、該制御端子に接続された前記専用充電器からのバイアスの供給により前記充電制御用スイッチのオン／オフを制御する充電保護回路とを備えたことを特徴とする充電保護回路付き電池パック。 A battery pack with a charge protection circuit having a built-in lithium-ion battery having a charge control switch connected in series and having a circuit for identifying and protecting a connection other than a dedicated charger, the control terminal being connected to the dedicated charger; And a charge protection circuit for controlling on / off of the charge control switch by supplying a bias from the dedicated charger connected to the control terminal. 前記充電保護回路は、前記専用充電器からバイアスを供給する回路に定電圧素子を挿入接続したことを特徴とする請求項１に記載の充電保護回路付き電池パック。 The battery pack with a charge protection circuit according to claim 1, wherein the charge protection circuit includes a constant voltage element inserted and connected to a circuit for supplying a bias from the dedicated charger. 前記充電保護回路は、前記制御端子に接続された前記専用充電器からバイアスが供給されオン／オフするスイッチ回路と、該スイッチ回路のオン／オフにより前記充電制御用スイッチのオン／オフを制御する回路とを有することを特徴とする請求項１又は２のいずれかに記載の充電保護回路付き電池パック。 The charge protection circuit controls a turn-on / off of the charge control switch by turning on / off the switch circuit which is supplied with a bias from the dedicated charger connected to the control terminal and is turned on / off. The battery pack with a charge protection circuit according to claim 1, further comprising a circuit. 前記スイッチ回路は、前記充電制御用スイッチのバイアス回路を形成するものであることを特徴とする請求項３に記載の充電保護回路付き電池パック。 4. The battery pack with a charge protection circuit according to claim 3, wherein the switch circuit forms a bias circuit for the charge control switch. 前記スイッチ回路は、前記充電制御用スイッチのバイアス回路を短絡するものであることを特徴とする請求項３に記載の充電保護回路付き電池パック。 4. The battery pack with a charge protection circuit according to claim 3, wherein the switch circuit short-circuits a bias circuit of the charge control switch. 前記充電保護回路は、前記専用充電器の一方の充電ラインとの間に前記充電制御用スイッチをオンに制御するバイアス回路を有することを特徴とする請求項１乃至５のいずれかに記載の充電保護回路付き電池パック。 6. The charging according to claim 1, wherein the charging protection circuit includes a bias circuit that controls the charging control switch to be turned on between one charging line of the dedicated charger. Battery pack with protection circuit. 前記バイアス回路は、前記一方の充電ラインに接続されたときオンになるスイッチ回路により形成されることを特徴とする請求項６に記載の充電保護回路付き電池パック。 The battery pack with a charge protection circuit according to claim 6, wherein the bias circuit is formed by a switch circuit that is turned on when connected to the one charging line.
JP2003272829A 2003-07-10 2003-07-10 Battery pack with charge protection circuit Expired - Lifetime JP4014099B2 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8729851B2 (en) 2007-01-12 2014-05-20 Koehler-Bright Star, Inc. Battery pack for miner's cap lamp with charging and discharging control module
JP2018137979A (en) * 2012-06-27 2018-08-30 株式会社半導体エネルギー研究所 Power storage unit

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8729851B2 (en) 2007-01-12 2014-05-20 Koehler-Bright Star, Inc. Battery pack for miner's cap lamp with charging and discharging control module
US8922159B2 (en) 2007-01-12 2014-12-30 Koehler-Bright Star, Inc. Battery pack for powering miner's cap lamp
US9362762B2 (en) 2007-01-12 2016-06-07 Koehler-Bright Star LLC Battery pack and cap lamp system
JP2018137979A (en) * 2012-06-27 2018-08-30 株式会社半導体エネルギー研究所 Power storage unit
US10797367B2 (en) 2012-06-27 2020-10-06 Semiconductor Energy Laboratory Co., Ltd. Power storage unit and solar power generation unit
US10978757B2 (en) 2012-06-27 2021-04-13 Semiconductor Energy Laboratory Co., Ltd. Power storage unit and solar power generation unit
US11563244B2 (en) 2012-06-27 2023-01-24 Semiconductor Energy Laboratory Co., Ltd. Power storage unit and solar power generation unit

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