JP2004259571A - Battery pack and electronic apparatus - Google Patents

Battery pack and electronic apparatus Download PDF

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Publication number
JP2004259571A
JP2004259571A JP2003048378A JP2003048378A JP2004259571A JP 2004259571 A JP2004259571 A JP 2004259571A JP 2003048378 A JP2003048378 A JP 2003048378A JP 2003048378 A JP2003048378 A JP 2003048378A JP 2004259571 A JP2004259571 A JP 2004259571A
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Japan
Prior art keywords
battery pack
electronic device
battery
voltage
terminal
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JP2003048378A
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Japanese (ja)
Inventor
Masaaki Nagabori
正明 長堀
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Japan Radio Co Ltd
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Japan Radio Co Ltd
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Priority to JP2003048378A priority Critical patent/JP2004259571A/en
Publication of JP2004259571A publication Critical patent/JP2004259571A/en
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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

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery pack and an electronic apparatus capable of preventing short circuiting between outer terminals through prohibition of power feeding by an apparatus other than a dedicated apparatus. <P>SOLUTION: Voltage is not generated at a battery terminal with a single battery pack due to a switching circuit of the battery pack 1, which prevents short circuiting between the terminals, and power feeding by a battery pack other than the dedicated battery pack is not possible by the existence of a detecting circuit 13 deciding whether it is a dedicated battery pack, which prevents troubles due to damage of an electronic apparatus caused by abnormal voltage or mismatching with an electronic apparatus caused by capacity shortage. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、単体で持ち運びする際の電極端子間のショートを防止するとともに、専用電子機器以外への給電を不可にする電池パックおよび電子機器に関するものである。
【０００２】
【従来の技術】
近年、電子機器には電源にリチウムイオン二次電池などが用いられている。図３は従来の電池パックおよび電子機器の構成例を示す図である。１は電池パック、２は電子機器、３は電池、４は電池パック正極端子、５は電池パック負極端子、６は電子機器正極端子、７は電子機器負極端子を示す。
【０００３】
図３に示すように電池パック１の電池パック正極端子４と電池パック負極端子５は電池パック１の外部に露出し電池パック１が電子機器２に装着された時に電子機器２に設けられた電子機器正極端子６と電子機器負極端子７に接触して電子機器２に対して電池パックより電源を供給するものである。
【０００４】
このように従来の電池パックにおいては電池パックから露出した外部端子間には常時電圧がかかっており、電池パック単体で持ち運ぶ時に、外部端子間に金属が触れることによりショート事故が発生する。このショート事故を防ぐため外部端子を小さくするあるいは外部端子間を離したりする方法があるが電池パック単体をポケットに入れて運ぶ時にネックレス等の金属によって外部端子がショートされるのを防ぐことはできない。
【０００５】
その対策として特開平６―２１５７４４に示すリードスイッチ方式がある。この方式は、電池パックの電池と外部端子間にリードスイッチを設けて電池パック単体時リードスイッチはＯＦＦとなり電池パックの外部端子に電圧が出ないようにしている。また、電子機器には磁石を設けておき、電池パックが電子機器に装着された時この磁石によりリードスイッチをＯＮとして電池パックの電池と外部端子間をＯＮとして外部端子に電圧が出て電子機器に電源が供給される方式である。このようにして、専用の電子機器にのみ給電できるようになっている。
【０００６】
【特許文献１】
特開平６−２１５７４４号公報
【０００７】
【発明が解決しようとする課題】
しかし、上記リードスイッチを持つ構造の電池パックでは機械的構造のため信頼性に問題がある。また、衝撃による瞬断の弱点がある。
本発明は上記の問題点を解決するためのもので、機械的なリードスイッチを使用せず、信頼性の高い電子回路を工夫することにより、電池パック単体を持ち運びする際には電池パックの外部端子には電圧が発生せず、外部端子間にショートが生じても事故に至らないようにし、電池パックを電子機器に装着することにより初めて電池パックの外部端子に電圧が発生し、電池パックから電子機器に電源を供給する。また、電池パックからその電池パック固有の情報を送り、電子機器にはその情報の検出回路を設けて、専用の電池パックかどうか判断して、専用の電子機器にのみ電池パックから給電して純正以外の電池パックにより発生する異常電圧給電による電子機器の破損や電池容量の過不足による電子機器との不適合による事故を防止するものである。
【０００８】
【課題を解決するための手段】
電池を内蔵する電池パックにおいて、前記電池の正極および負極に接続される外部端子を有し、前記電池正極と外部端子の間には、電子機器からの制御信号により電池正極と外部端子を断続するためのスイッチ回路を有し、前記スイッチ回路の断続を前記電子機器から制御するために前記スイッチ回路に接続される外部制御端子を有し、前記電池正極と外部制御端子間には電池パック抵抗素子を有し、前記電子機器においては、前記電池パックを装着した時に前記電池パック外部端子に電気的に接続される正極、負極および外部制御端子を持ち、正極と電子機器の主電源回路間には正極と主電源回路間を断続するスイッチ回路を有し、外部制御端子と負極間には電子機器抵抗素子を有し、電池パック抵抗素子と電子機器抵抗素子による電池電圧の分割電圧を検出する検出回路を有し、前記検出回路は電子機器に指定された電圧と同じ電圧である時はスイッチ回路を接続状態に制御するものである。
【０００９】
【発明の実施の形態】
以下に本発明における実施例を図面に基づき説明する。図１は本発明に係わる電池パックと電子機器の実施の形態を示す図である。１は電池パック、２は電子機器、３は電池、４は電池パック正極端子、５は電池パック負極端子、６は電子機器正極端子、７は電子機器負極端子、８は電池パック制御端子、９は電子機器制御端子、１０はＦＥＴスイッチ回路、１１は電池パック抵抗素子、１２は電子機器抵抗素子、１３は検出回路、１４は電子機器スイッチ回路で構成されている。
【００１０】
次に、上記実施例の動作について説明する。電池パック１が電子機器２に装着されないときは電池パック制御端子８がオープンとなるためＦＥＴスイッチ回路１０は電池パック抵抗素子１１によりソースとゲート電圧は同電位となるためＯＦＦとなり電池パック正極端子４には電圧が発生しない。従って電池パック単体で持ち運びした時、電池パック正極端子と負極端子間がショートしても事故は発生しない。
また、電子機器２に電池パック１を装着すると電池パック制御端子８と電子機器制御端子９が接続されＦＥＴスイッチ回路１０のゲート電圧が電池パック抵抗素子１１と電子機器抵抗素子１２とによる分割された電圧に低下するためＦＥＴスイッチ回路１０はＯＮとなり電池正極端子４に電圧が発生して電子機器正極端子９を介して電子機器２に電源が供給される。
また、電池パック抵抗素子１１と電子機器抵抗素子１２により電池電圧が分割され、この電圧が電子機器制御端子９に発生するので、この電圧を検出回路１３で監視して、自電子機器の専用電池パックかどうかを判断して専用電池パックと判断された場合のみ電子機器スイッチ回路１４をＯＮとする制御信号を検出回路１３から発生させ電子機器２の主電源回路に電源を供給する。
上記説明においては、電池パックのスイッチ回路をＦＥＴの場合について説明したが、電気的に断続できる素子であれば良い。ＦＥＴスイッチ回路に限定されるものではない。
【００１１】
検出回路１３の動作詳細を図２で説明する。図２において電子機器２の種類がＭＡ、ＭＢ、ＭＣ・・ＭＺがあったとする。電子機器２の種類毎の比較電圧値はそれぞれＶＡ、ＶＢ、ＶＣ・・ＶＺに設定する。これらの比較電圧値は異なるように決める。また、これらの電圧が各電子機器２の検出回路１３で検出された場合電子機器スイッチ回路１４をＯＮする信号を送り主電源回路へ電源を供給する。一方、電子機器制御端子９の電圧は電池パック抵抗素子１１と電子機器抵抗素子１２の分割電圧となる。従って、電池パック抵抗素子値と電子機器抵抗素子値を電子機器２の種類毎の比較電圧値になるように設定すれば、別の種類の電池を装着した場合、電子機器制御端子９の電圧値は自電子機器の比較電圧値とは異なるため検出回路１３から電子機器スイッチ回路１４をＯＮにする信号は送出できず、電池パック１から電子機器２の主電源回路に電源を供給できず、専用の電池パックの時しか電源は供給できないようになり、専用電池パック以外の装着による電子機器の破損や電池容量の過不足による電子機器との不適合による事故を防止することができる。特に最近は電池パックの共通化による金型費用の削減が検討されている。共通化により専用の電子機器以外に装着可能となるが、専用の電子機器以外に装着した場合の異常電圧による電子機器の破損や電池容量の過不足による電子機器との不適合による事故を防止するものである。
【００１２】
【発明の効果】
以上述べたように、本発明によると、電池パック単体の時は電池パックのスイッチ回路がＯＦＦに動作して電池端子に電圧が発生せず、端子間のショートから防ぐことができ、また電子機器の専用電池パックかどうか判断する検出回路を持つことにより純正の電池パック以外からの給電を防止することが出来る。
【図面の簡単な説明】
【図１】本発明における実施例を説明するための図である。
【図２】電子機器スイッチ回路をＯＮする条件の説明図である。
【図３】従来の電池パックと電子機器の構成例を説明するための図である。
【符号の説明】
１ 電池パック、 ２ 電子機器、 ３ 電池、 ４ 電池パック正極端子、 ５ 電池パック負極端子、 ６ 電子機器正極端子、 ７ 電子機器負極端子、８ 電池パック制御端子、 ９ 電子機器制御端子、 １０ ＦＥＴスイッチ回路、 １１ 電池パック抵抗素子、１２ 電子機器抵抗素子、 １３ 検出回路、 １４ 電子機器スイッチ回路[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a battery pack and an electronic device that prevent a short circuit between electrode terminals when being carried by itself and disable power supply to devices other than dedicated electronic devices.
[0002]
[Prior art]
2. Description of the Related Art In recent years, lithium-ion secondary batteries and the like have been used as power supplies for electronic devices. FIG. 3 is a diagram illustrating a configuration example of a conventional battery pack and an electronic device. 1 is a battery pack, 2 is an electronic device, 3 is a battery, 4 is a battery pack positive terminal, 5 is a battery pack negative terminal, 6 is an electronic device positive terminal, and 7 is an electronic device negative terminal.
[0003]
As shown in FIG. 3, the battery pack positive terminal 4 and the battery pack negative terminal 5 of the battery pack 1 are exposed to the outside of the battery pack 1, and are provided on the electronic device 2 when the battery pack 1 is mounted on the electronic device 2. The battery pack supplies power to the electronic device 2 by contacting the device positive terminal 6 and the electronic device negative terminal 7.
[0004]
As described above, in the conventional battery pack, a voltage is constantly applied between the external terminals exposed from the battery pack. When the battery pack is carried by itself, a short circuit occurs due to the metal touching the external terminals. In order to prevent this short-circuit accident, there is a method of reducing the size of the external terminals or separating the external terminals. .
[0005]
As a countermeasure, there is a reed switch system disclosed in JP-A-6-215744. In this method, a reed switch is provided between the battery and the external terminal of the battery pack, and the reed switch is turned off when the battery pack is alone, so that no voltage is output to the external terminal of the battery pack. In addition, a magnet is provided in the electronic device, and when the battery pack is mounted on the electronic device, the magnet turns on the reed switch to turn on the battery between the battery of the battery pack and the external terminal to output a voltage to the external terminal. Power is supplied to the power supply. In this way, power can be supplied only to the dedicated electronic device.
[0006]
[Patent Document 1]
JP-A-6-215744
[Problems to be solved by the invention]
However, the battery pack having the above-described reed switch has a problem in reliability due to its mechanical structure. There is also a weak point of instantaneous interruption due to impact.
The present invention has been made to solve the above problems, and does not use a mechanical reed switch. No voltage is generated at the terminals, so that even if a short circuit occurs between the external terminals, an accident does not occur, and voltage is generated at the external terminals of the battery pack for the first time by attaching the battery pack to the electronic device. Supply power to electronic equipment. In addition, information specific to the battery pack is sent from the battery pack, and a detection circuit for the information is provided in the electronic device to determine whether or not the battery pack is a dedicated battery pack. This prevents an electronic device from being damaged due to an abnormal voltage supply generated by a battery pack other than the above, or an accident due to incompatibility with the electronic device due to excessive or insufficient battery capacity.
[0008]
[Means for Solving the Problems]
In a battery pack incorporating a battery, an external terminal connected to a positive electrode and a negative electrode of the battery is provided, and between the battery positive electrode and the external terminal, the battery positive electrode and the external terminal are interrupted by a control signal from an electronic device. An external control terminal connected to the switch circuit for controlling the on / off of the switch circuit from the electronic device, and a battery pack resistance element between the battery positive electrode and the external control terminal. The electronic device has a positive electrode, a negative electrode, and an external control terminal that are electrically connected to the external terminal of the battery pack when the battery pack is mounted, and between the positive electrode and a main power supply circuit of the electronic device. It has a switch circuit that connects and disconnects between the positive electrode and the main power supply circuit, has an electronic device resistance element between the external control terminal and the negative electrode, and has a battery pack resistance element and an electronic device resistance element. Has a detection circuit for detecting a divided voltage, the detection circuit when the same voltage as specified for the electronic device controls the switching circuit to the connected state.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
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 and an electronic device according to the present invention. 1 is a battery pack, 2 is an electronic device, 3 is a battery, 4 is a battery pack positive terminal, 5 is a battery pack negative terminal, 6 is an electronic device positive terminal, 7 is an electronic device negative terminal, 8 is a battery pack control terminal, 9 Is an electronic equipment control terminal, 10 is an FET switch circuit, 11 is a battery pack resistance element, 12 is an electronic equipment resistance element, 13 is a detection circuit, and 14 is an electronic equipment switch circuit.
[0010]
Next, the operation of the above embodiment will be described. When the battery pack 1 is not mounted on the electronic device 2, the battery pack control terminal 8 is open, so that the FET switch circuit 10 is turned off because the source and gate voltages are the same by the battery pack resistance element 11, and is turned off. No voltage is generated. Therefore, when the battery pack is carried alone, no accident occurs even if the positive electrode terminal and the negative electrode terminal of the battery pack are short-circuited.
When the battery pack 1 is mounted on the electronic device 2, the battery pack control terminal 8 and the electronic device control terminal 9 are connected, and the gate voltage of the FET switch circuit 10 is divided by the battery pack resistance element 11 and the electronic device resistance element 12. Since the voltage drops to a voltage, the FET switch circuit 10 is turned on, a voltage is generated at the battery positive terminal 4, and power is supplied to the electronic device 2 via the electronic device positive terminal 9.
Also, the battery voltage is divided by the battery pack resistance element 11 and the electronic equipment resistance element 12, and this voltage is generated at the electronic equipment control terminal 9. This voltage is monitored by the detection circuit 13, and the dedicated battery of the own electronic equipment is monitored. The detection circuit 13 generates a control signal to turn on the electronic device switch circuit 14 only when it is determined that the battery pack is a dedicated battery pack, and supplies power to the main power supply circuit of the electronic device 2.
In the above description, the case where the switch circuit of the battery pack is an FET has been described. It is not limited to the FET switch circuit.
[0011]
Details of the operation of the detection circuit 13 will be described with reference to FIG. In FIG. 2, it is assumed that the types of the electronic devices 2 are MA, MB, MC,. The comparison voltage value for each type of electronic device 2 is set to VA, VB, VC... VZ, respectively. These comparison voltage values are determined differently. When these voltages are detected by the detection circuit 13 of each electronic device 2, a signal for turning on the electronic device switch circuit 14 is sent to supply power to the main power supply circuit. On the other hand, the voltage of the electronic device control terminal 9 is a divided voltage of the battery pack resistance element 11 and the electronic device resistance element 12. Therefore, if the battery pack resistance element value and the electronic device resistance element value are set so as to be comparison voltage values for each type of the electronic device 2, the voltage value of the electronic device control terminal 9 when another type of battery is mounted. Is different from the comparison voltage value of the own electronic device, a signal for turning on the electronic device switch circuit 14 cannot be transmitted from the detection circuit 13, and power cannot be supplied from the battery pack 1 to the main power supply circuit of the electronic device 2. Power can be supplied only when the battery pack is a battery pack of this type, and it is possible to prevent damage to the electronic apparatus due to mounting other than the dedicated battery pack, and to prevent accidents due to incompatibility with the electronic apparatus due to excessive or insufficient battery capacity. Particularly, recently, reduction of die cost by using a common battery pack is being studied. Although it can be mounted on devices other than dedicated electronic devices due to commonality, it prevents damage to electronic devices due to abnormal voltage when attached to devices other than dedicated electronic devices and accidents due to incompatibility with electronic devices due to excessive or insufficient battery capacity. It is.
[0012]
【The invention's effect】
As described above, according to the present invention, when the battery pack is used alone, the switch circuit of the battery pack operates to turn off, and no voltage is generated at the battery terminals, thereby preventing a short circuit between the terminals. Power supply from a source other than the genuine battery pack can be prevented by providing a detection circuit for determining whether the battery pack is a dedicated battery pack.
[Brief description of the drawings]
FIG. 1 is a diagram for explaining an embodiment of the present invention.
FIG. 2 is an explanatory diagram of a condition for turning on an electronic device switch circuit.
FIG. 3 is a diagram illustrating a configuration example of a conventional battery pack and an electronic device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 battery pack, 2 electronic devices, 3 batteries, 4 battery pack positive terminal, 5 battery pack negative terminal, 6 electronic device positive terminal, 7 electronic device negative terminal, 8 battery pack control terminal, 9 electronic device control terminal, 10 FET switch Circuit, 11 battery pack resistance element, 12 electronic equipment resistance element, 13 detection circuit, 14 electronic equipment switch circuit

Claims (3)

電池を内蔵する電池パックにおいて、前記電池の正極および負極に接続される外部端子を有し、前記電池正極と外部端子の間には、電子機器からの制御信号により電池正極と外部端子を断続するためのスイッチ回路を有し、前記スイッチ回路の断続を前記電子機器から制御するために前記スイッチ回路に接続される外部制御端子を有し、前記電池正極と外部制御端子間には電池パック抵抗素子を有し、前記電池パックが前記電子機器に装着された時のみ前記電池パックの外部端子に電圧が発生することを特徴とする電池パック。In a battery pack incorporating a battery, an external terminal connected to a positive electrode and a negative electrode of the battery is provided, and between the battery positive electrode and the external terminal, the battery positive electrode and the external terminal are interrupted by a control signal from an electronic device. An external control terminal connected to the switch circuit for controlling the on / off of the switch circuit from the electronic device, and a battery pack resistance element between the battery positive electrode and the external control terminal. And a voltage is generated at an external terminal of the battery pack only when the battery pack is mounted on the electronic device. 前記電子機器においては、前記電池パックを装着した時に前記電池パック外部端子に電気的に接続される正極、負極および外部制御端子を持ち、正極と電子機器の主電源回路間には正極と主電源回路間を断続するスイッチ回路を有し、外部制御端子と負極間には電子機器抵抗素子を有し、電池パック抵抗素子と電子機器抵抗素子による電池電圧の分割電圧を検出する検出回路を有し、前記検出回路は電子機器に指定された電圧と同じ電圧である時はスイッチ回路を接続状態に制御することを特徴とする電子機器。The electronic device has a positive electrode, a negative electrode, and an external control terminal electrically connected to the external terminal of the battery pack when the battery pack is mounted, and has a positive electrode and a main power supply between the positive electrode and a main power circuit of the electronic device. It has a switch circuit for intermittent connection between circuits, has an electronic device resistance element between the external control terminal and the negative electrode, and has a detection circuit for detecting a divided voltage of a battery voltage by the battery pack resistance element and the electronic device resistance element. The electronic device, wherein the detection circuit controls the switch circuit to be connected when the voltage is the same as the voltage specified for the electronic device. 前記電池パックに設けられたスイッチ回路がＦＥＴで構成されていることを特徴とする請求項１に記載の電池パック。The battery pack according to claim 1, wherein the switch circuit provided in the battery pack is configured by an FET.
JP2003048378A 2003-02-26 2003-02-26 Battery pack and electronic apparatus Pending JP2004259571A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006310061A (en) * 2005-04-28 2006-11-09 Ishikawajima Harima Heavy Ind Co Ltd Underwater travelling vehicle
US7683571B2 (en) 2006-03-13 2010-03-23 Seiko Epson Corporation Electronic device, method for controlling the same, and program for the same
JP2011103706A (en) * 2009-11-10 2011-05-26 Icom Inc Battery pack

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006310061A (en) * 2005-04-28 2006-11-09 Ishikawajima Harima Heavy Ind Co Ltd Underwater travelling vehicle
US7683571B2 (en) 2006-03-13 2010-03-23 Seiko Epson Corporation Electronic device, method for controlling the same, and program for the same
JP2011103706A (en) * 2009-11-10 2011-05-26 Icom Inc Battery pack

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