JP3829307B2 - Battery pack with control terminal - Google Patents
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- JP3829307B2 JP3829307B2 JP2003325383A JP2003325383A JP3829307B2 JP 3829307 B2 JP3829307 B2 JP 3829307B2 JP 2003325383 A JP2003325383 A JP 2003325383A JP 2003325383 A JP2003325383 A JP 2003325383A JP 3829307 B2 JP3829307 B2 JP 3829307B2
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims description 13
- 229910001416 lithium ion Inorganic materials 0.000 claims description 13
- 238000007599 discharging Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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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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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Description
本発明は、放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本体に放電を行う電池パックに関する。 The present invention relates to a battery pack having a built-in lithium ion battery in which discharge control switches are connected in series and discharging to a dedicated main body.
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、放電器が用意される（例えば、特許文献１、２参照）。
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 the battery is accidentally charged / discharged by another device, 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 the battery is removed by any means other than a single unit with 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、保護回路を備えず、取り外し可能にしても専用の本体（放電器）以外の機器への放電を阻止できるようにする簡単な回路で部品点数を低減し、小型化、低コスト化を図るものである。 The present invention solves the above-described problem, and does not include a protection circuit, and even if it can be removed, it is a simple circuit that can prevent discharge to equipment other than a dedicated main body (discharger). To reduce the size and cost.
そのために本発明は、放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本体に放電を行う電池パックであって、前記放電制御用スイッチのゲートと前記放電制御用スイッチの接続されていない電源ラインとの間にヒューズと第１のオープン端子対と第２のオープン端子対との直列回路を接続すると共に、前記ヒューズの両端を含む前記直列回路の各直列接続点から前記専用本体に接続する複数の制御端子を備えたことを特徴とする。 To this end, the present invention is a battery pack that incorporates a lithium ion battery having discharge control switches connected in series and discharges to a dedicated body, wherein the gate of the discharge control switch and the discharge control switch are connected to each other. A series circuit of a fuse, a first open terminal pair, and a second open terminal pair is connected between the power supply line and the dedicated main body from each series connection point of the series circuit including both ends of the fuse. A plurality of control terminals to be connected are provided .
本発明によれば、放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本体に放電を行う電池パックであって、前記放電制御用スイッチのゲートと前記放電制御用スイッチの接続されていない電源ラインとの間にヒューズと第１のオープン端子対と第２のオープン端子対との直列回路を接続すると共に、前記ヒューズの両端を含む前記直列回路の各直列接続点から前記専用本体に接続する複数の制御端子を備えたので、保護回路がなく部品点数を少なくした簡単な回路構成で専用の放電器を接続してはじめてバイアスを供給し放電制御用スイッチをオンに制御でき、また、専用の放電器側で自由度を持ったバイアス回路を設計できる。 According to the present invention, the battery pack includes a lithium ion battery in which discharge control switches are connected in series and discharges to a dedicated main body, wherein the gate of the discharge control switch and the discharge control switch are connected to each other. A series circuit of a fuse, a first open terminal pair, and a second open terminal pair is connected between the power supply line and the dedicated main body from each series connection point of the series circuit including both ends of the fuse. Since it has a plurality of control terminals to be connected, it is possible to control the discharge control switch to be turned on only by connecting a dedicated discharger with a simple circuit configuration with no protection circuit and a reduced number of parts, A bias circuit with a degree of freedom can be designed on the dedicated discharger side.
以上のように、本発明によれば、電力を消費する保護ＩＣを使うことなく、専用本体でのみ放電制御用スイッチの開閉制御を行う方式を用い、専用本体からの取り外しを可能としつつ、回路を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、省電力化を図りつつ充電保護を行うことができる。 As described above, according to the present invention, without using a protection IC that consumes power, a circuit that performs opening / closing control of the discharge control switch only on the dedicated body is used, and the circuit can be removed from the dedicated body. Therefore, it is possible to reduce the number of parts with a simple circuit and to protect the charging while reducing the size, reducing the cost, and saving the power.
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は本発明に係る制御端子付き電池パックの実施の形態を示す図であり、１は電池パック部、２は専用本体（放電器）、Ｂはリチウムイオン電池、ＦＥＴは放電制御用スイッチ、Ｆはヒューズ、Ｐ１、Ｐ２はオープン端子対、Ｐ＋は正極端子、Ｐ−は負極端子、Ｒ１、Ｒ３はバイアス抵抗、Ｐｃ２〜Ｐｃ４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 control terminal according to the present invention, wherein 1 is a battery pack unit, 2 is a dedicated body (discharger), B is a lithium ion battery, FET is a discharge control switch, F is a fuse, P1 and P2 are open terminal pairs, P + is a positive terminal, P− is a negative terminal, R1 and R3 are bias resistors, and Pc2 to Pc4 are control terminals.
図１において、電池パック部１は、放電制御用スイッチＦＥＴを直列に接続したリチウムイオン電池Ｂを内蔵し、バイアス抵抗Ｒ１、制御端子Ｐｃ２〜Ｐｃ４を介した専用本体（放電器）２の回路により放電制御用スイッチＦＥＴのバイアス回路を構成している。バイアス抵抗Ｒ１は、放電制御用スイッチＦＥＴのゲートＧ・ソースＳ間をバイアスするものである。
In FIG. 1, a
放電制御用スイッチＦＥＴは、ソースＳがリチウムイオン電池Ｂの正極に接続され、ドレインＤが専用本体（放電器）２に接続する外部端子Ｐ＋に引き出され、ゲートＧとソースＳとの間にバイアス抵抗Ｒ１が接続される。そして、ゲートＧとバイアス抵抗Ｒ１との接続点が負極ラインに接続されてバイアス電流が供給されることにより、放電制御用スイッチＦＥＴがオンしてリチウムイオン電池Ｂから外部端子Ｐ＋を通して専用本体（放電器）２に放電が実行される。 In the discharge control switch FET, the source S is connected to the positive electrode of the lithium ion battery B, the drain D is drawn out to the external terminal P + connected to the dedicated body (discharger) 2, and a bias is applied between the gate G and the source S. A resistor R1 is connected. Then, the connection point between the gate G and the bias resistor R1 is connected to the negative electrode line and a bias current is supplied, whereby the discharge control switch FET is turned on and the lithium ion battery B is connected to the dedicated main body (released through the external terminal P +). Electric appliance) 2 is discharged.
放電制御用スイッチＦＥＴのゲートＧと負極ラインとの間にヒューズＦとオープン端子対Ｐ１、Ｐ２が直列接続され、専用本体（放電器）２に接続される制御端子Ｐｃ２〜Ｐｃ４は、それぞれの直列接続点から取り出されている。すなわち、制御端子Ｐｃ２は、ヒューズＦ、オープン端子対Ｐ１、Ｐ２の全てをバイパスするバイアス回路を構成し、制御端子Ｐｃ３は、ヒューズＦを通してオープン端子対Ｐ１、さらにはＰ２をバイパスするバイアス回路を構成する。したがって、このオープン端子対Ｐ１、Ｐ２のうち、電池パック部１で短絡片により、例えばオープン端子対Ｐ１が短絡されている場合にはその両側の制御端子Ｐｃ３、Ｐｃ４が同レベルになり、オープン端子対Ｐ２が短絡されている場合には制御端子Ｐｃ４は制御の機能が失われる。
The fuse F and the open terminal pair P1, P2 are connected in series between the gate G and the negative electrode line of the discharge control switch FET, and the control terminals Pc2 to Pc4 connected to the dedicated body (discharger) 2 are connected in series. Removed from the connection point. That is, the control terminal Pc2 constitutes a bias circuit that bypasses all of the fuse F and the open terminal pairs P1 and P2, and the control terminal Pc3 constitutes a bias circuit that bypasses the open terminal pair P1 and further P2 through the fuse F. To do. Therefore, of the open terminal pairs P1 and P2, when the open terminal pair P1 is short-circuited by the short-circuit piece in the
このように制御端子Ｐｃ２〜Ｐｃ４は、専用本体（放電器）２を介してバイアス抵抗Ｒ１にバイアス電流を供給するためのものであり、これら制御端子Ｐｃ２〜Ｐｃ４より専用本体（放電器）２を介して回路が形成されてはじめて放電制御用スイッチＦＥＴをオンにするバイアスが供給され、専用本体（放電器）２にリチウムイオン電池Ｂから放電電流が供給される。この回路が遮断されると、放電制御用スイッチＦＥＴがオフになり放電が阻止される。 Thus, the control terminals Pc2 to Pc4 are for supplying a bias current to the bias resistor R1 via the dedicated body (discharger) 2, and the dedicated body (discharger) 2 is connected to the control terminals Pc2 to Pc4. The bias for turning on the discharge control switch FET is supplied only after the circuit is formed, and the dedicated current (discharger) 2 is supplied with the discharge current from the lithium ion battery B. When this circuit is interrupted, the discharge control switch FET is turned off to prevent discharge.
上記構成の電池パック部１に対し、専用本体（放電器）２では、図１に示すように制御端子Ｐｃ２又はＰｃ３から負極ラインにバイアス抵抗Ｒ３を接続する回路が備えられていれば、放電制御用スイッチＦＥＴがオンになって専用本体（放電器）２にリチウムイオン電池Ｂからの放電を可能になる。また、バイアス抵抗Ｒ３を制御端子Ｐｃ４から負極ラインに接続する回路が備えられている専用本体（放電器）２に対しては、電池パック部１でオープン端子対Ｐ１が例えば短絡片で短絡されていることが必要となる。
With respect to the
図２は本発明に係る制御端子付き電池パックの他の実施の形態を示す図であり、専用本体（放電器）２において、バイアス電流を供給する制御端子Ｐｃ２〜Ｐｃ４の間にＰＮＰのトランジスタＴｒｃのエミッタ・コレクタを接続し、そのベースバイアスを制御する回路を備えた実施形態を示している。この実施形態では、常時オンのコンタクタＣｔｔとバイアス抵抗Ｒ３とを直列にしてトランジスタＴｒｃのベースと負極ラインとの間に接続しているので、専用本体（放電器）２において、コンタクタＣｔｔをオフにすることにより放電制御用スイッチＦＥＴのバイアスを遮断できるように構成している。なお、本実施形態では、トランジスタＴｒｃのコレクタが制御端子Ｐｃ４に接続されるので、オープン端子対Ｐ２を短絡片３で短絡している。勿論、ＰＮＰのトランジスタＴｒｃを省き図１と同様にバイアス抵抗Ｒ３を直接接続し、これにコンタクタＣｔｔを直列に挿入するように構成してもよい。
FIG. 2 is a diagram showing another embodiment of the battery pack with a control terminal according to the present invention. In the dedicated body (discharger) 2, a PNP transistor Trc between the control terminals Pc2 to Pc4 for supplying a bias current. The embodiment is provided with a circuit for connecting the emitter-collector and controlling the base bias thereof. In this embodiment, since the always-on contactor Ctt and the bias resistor R3 are connected in series between the base of the transistor Trc and the negative electrode line, the contactor Ctt is turned off in the dedicated body (discharger) 2. By doing so, the bias of the discharge control switch FET can be cut off. In the present embodiment, since the collector of the transistor Trc is connected to the control terminal Pc4, the open terminal pair P2 is short-circuited by the short-
上記のように本実施形態では、制御回路自体に電源を持たなくても、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本体（放電器）を認識して、スイッチを開閉することにより放電保護を行っている。したがって、専用本体でのみスイッチの開閉を行う方式を用いて、専用本体からの取り外しを可能としつつ安全性を確保することが可能であり、小型、部品点数の低減、省電力、低価格化を可能とする電池パック、専用本体を提供することができる。 As described above, in this embodiment, even if the control circuit itself does not have a power source, by recognizing the system for externally controlling the switch circuit and the dedicated body (discharger) with built-in protection operation, the switch circuit is opened and closed. Discharge protection is performed. Therefore, using a method that opens and closes the switch only on the dedicated main body, it is possible to ensure safety while enabling removal from the dedicated main body, and it is possible to reduce the size, reduce the number of parts, save power, and reduce the price. A battery pack and a dedicated main body can be provided.
なお、本発明は、上記実施の形態に限定されるものではなく、種々の変形が可能である。例えば上記実施の形態では、所定の抵抗値のバイアス抵抗を用いて動作電圧を制限したが、バイアス電圧が低い場合には動作を制限するように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、安定した動作の制限を行うようにしてもよいし、また、このような抵抗をそれぞれ制御端子Ｐｃ１〜Ｐｃ４に直列に挿入してもよい。 In addition, this invention is not limited to the said embodiment, A various deformation | transformation is possible. For example, in the above embodiment, the operating voltage is limited using a bias resistor having a predetermined resistance value. However, when the bias voltage is low, a constant voltage element such as a non-linear resistance element or a Zener diode is used so as to limit the operation. Thus, stable operation may be restricted, and such resistors may be inserted in series with the control terminals Pc1 to Pc4, respectively.
本発明によれば、放電制御用スイッチＦＥＴのゲートＧをオフにラッチしつつ、ゲート駆動用の抵抗を専用本体に端子経由で接続するが、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るので、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専用本体（放電器）から強制的に放電の停止を行うことが可能となる。この他にも、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, while the gate G of the discharge control switch FET is latched off, the resistance for driving the gate is connected to the dedicated main body via the terminal. By combining a plurality of methods such as a constant method using resistance voltage division and a Zener that is driven only at a constant voltage at the terminal portion, a complicated terminal distribution can be achieved, so that the main body can be specified more reliably. Further, it becomes possible to forcibly stop the discharge from the dedicated main body (discharger) by a switch 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 detection element such as an IC for the terminal portion.
１…電池パック部、２…専用本体（放電器）、Ｂ…リチウムイオン電池、ＦＥＴ…放電制御用スイッチ、Ｆ…ヒューズ、Ｐ１、Ｐ２…オープン端子対、Ｐ＋…正極端子、Ｐ−…負極端子、Ｒ１、Ｒ３…バイアス抵抗、Ｐｃ２〜Ｐｃ４…制御端子
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