JP4538435B2 - Battery pack charging system - Google Patents

Battery pack charging system Download PDF

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JP4538435B2
JP4538435B2 JP2006234651A JP2006234651A JP4538435B2 JP 4538435 B2 JP4538435 B2 JP 4538435B2 JP 2006234651 A JP2006234651 A JP 2006234651A JP 2006234651 A JP2006234651 A JP 2006234651A JP 4538435 B2 JP4538435 B2 JP 4538435B2
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battery
secondary battery
switch device
battery pack
charger
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JP2008061363A (en
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真作 黒田
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GS Yuasa International Ltd
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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
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    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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    • Y02E60/10—Energy storage using batteries

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Description

本発明は、リチウム二次電池をはじめとする二次電池と、その二次電池の電圧をモニタするための電池電圧検出用信号出力端子とが備えられた電池パックを、充電器に接続して充電する電池パックの充電システムに関する。   The present invention relates to a battery pack including a secondary battery such as a lithium secondary battery and a battery voltage detection signal output terminal for monitoring the voltage of the secondary battery. The present invention relates to a charging system for a battery pack to be charged.

二次電池を収納した電池パックには、二次電池が適正な動作状態にあるか否かを監視する電池監視装置が備えられる場合が多い。
この電池監視装置は、従来、下記特許文献１にも記載のように、二次電池が非使用状態となって二次電池の動作状態の監視が不要となったときは、二次電池からの電力供給により動作する電池監視装置への通電を停止させて二次電池の消耗を防止することが行われている。
このような二次電池の消耗の防止は、過放電状態となってしまったときに再充電による再利用が困難となるリチウムイオン電池において特に有用である。
下記特許文献１は、電池パックに負荷機器を接続した場合の技術が記載されているが、下記特許文献２のように、二次電池を充電する場合においても同様にして電池監視装置による電力の消耗を抑制する技術が考えられている。
特開平１１−１７８２２６号公報 特開２００２−８４６６９号公報 In many cases, a battery pack that houses a secondary battery is provided with a battery monitoring device that monitors whether the secondary battery is in an appropriate operating state.
Conventionally, as described in Patent Document 1 below, when the secondary battery is not in use and monitoring of the operation state of the secondary battery becomes unnecessary, this battery monitoring device is Stopping energization of a battery monitoring device that operates by supplying electric power to prevent the secondary battery from being consumed.
Such prevention of consumption of the secondary battery is particularly useful in a lithium ion battery in which reuse by recharging becomes difficult when an overdischarged state occurs.
The following Patent Document 1 describes a technique when a load device is connected to a battery pack. However, as in Patent Document 2 below, when a secondary battery is charged, the power of the battery monitoring device is also similar. A technique for suppressing consumption is considered.
JP-A-11-178226 JP 2002-84669 A

しかしながら、上記従来技術のように、二次電池の非使用時に電池パック内の電池監視装置への通電を停止して二次電池の消耗を阻止した場合でも、希に二次電池が消耗してしまう場合があった。
本発明は、かかる実情に鑑みてなされたものであって、その目的は、非使用状態での二次電池の消耗を可及的に抑制する点にある。 However, even when the secondary battery is not consumed by stopping the energization of the battery monitoring device in the battery pack when the secondary battery is not in use as in the above prior art, the secondary battery is rarely consumed. There was a case.
This invention is made | formed in view of this situation, The objective is to suppress the consumption of the secondary battery in a non-use state as much as possible.

本出願の第１の発明は、二次電池と、その二次電池の電圧をモニタするための電池電圧検出用信号出力端子とが備えられた電池パックを、充電器に接続して充電する電池パックの充電システムにおいて、前記充電器に、前記電池電圧検出用信号出力端子に接続される電圧検出部が備えられ、前記二次電池から前記電池電圧検出用信号出力端子を経て前記充電器の前記電圧検出部に至る配線の途中箇所に、その配線の通電を入り切りする第２スイッチ装置が備えられ、前記充電器に、前記二次電池の電圧をモニタする必要のないときに、前記第２スイッチ装置を切り状態に切換えるスイッチ制御部が備えられている。   A first invention of the present application is a battery for charging a battery pack provided with a secondary battery and a battery voltage detection signal output terminal for monitoring the voltage of the secondary battery by connecting to a charger. In the pack charging system, the charger is provided with a voltage detection unit connected to the battery voltage detection signal output terminal, and the secondary battery is connected to the battery voltage detection signal output terminal through the battery voltage detection signal output terminal. A second switch device for turning on and off the wiring is provided in the middle of the wiring leading to the voltage detection unit, and when the charger does not need to monitor the voltage of the secondary battery, the second switch A switch control unit is provided for switching the device to the off state.

すなわち、本発明の発明者は、二次電池の非使用時に電池監視装置への通電を停止しているにも拘わらず二次電池が消耗してしまうという現象は、そのような現象の発生に気付いた電池パックのユーザが、特徴的に、電池パックと充電器とを接続したまま長期に亘って保管していたことを突き止めた。
本来、電池パックと充電器とは分離した状態で保管するものであるが、接続したまま保管されていたのである。
もちろん、このような保管形態でも、上述のように電池監視装置への通電を停止することで二次電池の消耗は防げるようになっている。
そこで、更に詳細に原因を調べたところ、二次電池の電圧をモニタするための電池電圧検出用信号出力端子を経て漏れ出る微小電流が原因であることを見出した。
充電器側の電圧検出部の入力インピーダンスが非常に高いことから、二次電池の電圧をモニタするための信号線を流れる電流は、およそその電流経路で流れる電流を漏れ電流として意識することがないほどの微小な電流であるが、電池パックと充電器とを接続したままで、あまりに長期間に亘って保管するということになると、その微小な電流が無視できないものとなるのである。 In other words, the inventor of the present invention, when the secondary battery is not used, the phenomenon that the secondary battery is consumed even though the power supply to the battery monitoring device is stopped is the occurrence of such a phenomenon. The user of the noticed battery pack has characteristically found out that it has been stored for a long time with the battery pack and the charger connected.
Originally, the battery pack and the charger are stored in a separated state, but they are stored in a connected state.
Of course, even in such a storage mode, it is possible to prevent the secondary battery from being consumed by stopping energization of the battery monitoring device as described above.
Then, the cause was investigated in more detail, and it was found that the cause was a minute current leaking through the battery voltage detection signal output terminal for monitoring the voltage of the secondary battery.
Since the input impedance of the voltage detector on the charger side is very high, the current flowing through the signal line for monitoring the voltage of the secondary battery is not aware of the current flowing through the current path as a leakage current. Although the current is as small as possible, if the battery pack and the charger are connected and stored for an excessively long period of time, the minute current cannot be ignored.

以上のような知見から、二次電池から電池電圧検出用信号出力端子を経て充電器側の電圧検出部に至る配線の途中箇所に、その配線の通電を入り切りする第２スイッチ装置を備えると共に、二次電池の電圧をモニタする必要のないときに、第２スイッチ装置を切り状態に切換えることで、二次電池の電圧をモニタするための信号線に流れる微小電流を遮断するのである。   From the above knowledge, the second switch device for turning on and off the wiring is provided in the middle of the wiring from the secondary battery through the battery voltage detection signal output terminal to the voltage detection unit on the charger side, When it is not necessary to monitor the voltage of the secondary battery, the minute current flowing through the signal line for monitoring the voltage of the secondary battery is cut off by switching the second switch device to the off state.

又、本出願の第２の発明は、上記第１の発明の構成に加えて、前記第２スイッチ装置は、前記二次電池から前記電池電圧検出用信号出力端子に至るまでの配線の途中箇所に備えられている。
すなわち、前記第２スイッチ装置の設置位置としては、充電器側の配線に設置することも考えられるが、充電器側ではなく電池パック側に設置することで、電池パックを負荷機器に接続する際にも、電池パック側の前記第２スイッチを切り状態として二次電池の消耗を防止できる。 According to a second invention of the present application, in addition to the configuration of the first invention, the second switch device is arranged at a midpoint of wiring from the secondary battery to the battery voltage detection signal output terminal. Is provided.
That is, as the installation position of the second switch device, it is conceivable that the second switch device is installed in the wiring on the charger side, but when the battery pack is connected to the load device by installing on the battery pack side instead of the charger side. In addition, it is possible to prevent the secondary battery from being consumed by turning off the second switch on the battery pack side.

又、本出願の第３の発明は、上記第２の発明の構成に加えて、前記電池パックに、前記二次電池が適正な動作状態にあるか否かを監視する電池監視装置と、前記二次電池から前記電池監視装置への通電を入り切りする第１スイッチ装置とが備えられ、前記スイッチ制御部からの前記第２スイッチ装置を切り状態に切換える信号によって、前記第１スイッチ装置が切り状態に切換えられるように構成されている。
すなわち、充電器側のスイッチ制御部からの制御信号によって、前記第２スイッチ装置のみならず前記第１スイッチ装置をも同時に切り状態に切換え操作する。 According to a third invention of the present application, in addition to the configuration of the second invention, a battery monitoring device for monitoring whether or not the secondary battery is in an appropriate operating state in the battery pack; A first switch device for turning on and off the energization of the battery monitoring device from a secondary battery, and the first switch device is turned off by a signal for switching the second switch device to a turned off state from the switch control unit. It is comprised so that it can be switched to.
That is, according to a control signal from the switch control unit on the charger side, not only the second switch device but also the first switch device are simultaneously switched to the off state.

上記第１の発明によれば、二次電池の電圧をモニタするための信号線に流れる微小電流を遮断することで、非使用状態での二次電池の消耗を可及的に抑制できるものとなった。
又、上記第２の発明によれば、電池パックを負荷機器に接続する際にも、負荷機器側に前記第２スイッチ装置を備えることなく、二次電池の消耗を防止できる。
又、上記第３の発明によれば、充電器側のスイッチ制御部からの制御信号によって、前記第２スイッチ装置のみならず前記第１スイッチ装置をも同時に切り状態に切換え操作するので、第１スイッチ装置及び第２スイッチ装置の切換え操作のために信号線を共通化して信号配線の簡素化を図ることができる。 According to the first invention, the consumption of the secondary battery in a non-use state can be suppressed as much as possible by cutting off the minute current flowing in the signal line for monitoring the voltage of the secondary battery. became.
Further, according to the second aspect of the present invention, when the battery pack is connected to the load device, the secondary battery can be prevented from being consumed without providing the second switch device on the load device side.
Further, according to the third aspect of the invention, not only the second switch device but also the first switch device is simultaneously switched to the off state by the control signal from the switch control unit on the charger side. For the switching operation of the switch device and the second switch device, the signal lines can be made common to simplify the signal wiring.

以下、本発明の電池パックの充電システムの実施の形態を図面に基づいて説明する。
本実施の形態で例示する電池パックＢＰは、図１に示すように、二次電池ＲＢとして複数個（具体的には、３個）の電池セルＣ１，Ｃ２，Ｃ３を直列接続して構成した組電池を保護の対象としており、二次電池ＲＢを収納する電池パックＢＰには、二次電池ＲＢが適正な動作状態にあるか否かを監視する電池監視装置ＧＣが内蔵されている。尚、本実施の形態の電池セルＣ１，Ｃ２，Ｃ３はリチウムイオン電池である。
この電池パックＢＰは、二次電池ＲＢに対する負荷である各種の電気機器に取付けられて、負荷と接続する一対の出力端子Ｔ１，Ｔ２から負荷側へ電力が供給される。 Embodiments of a battery pack charging system according to the present invention will be described below with reference to the drawings.
The battery pack BP exemplified in the present embodiment is configured by connecting a plurality (specifically, three) of battery cells C1, C2, C3 as a secondary battery RB in series as shown in FIG. A battery monitoring device GC for monitoring whether or not the secondary battery RB is in an appropriate operating state is built in the battery pack BP that houses the assembled battery and that houses the secondary battery RB. Note that the battery cells C1, C2, and C3 of the present embodiment are lithium ion batteries.
The battery pack BP is attached to various electric devices that are loads for the secondary battery RB, and power is supplied to the load side from a pair of output terminals T1 and T2 connected to the load.

〔電池パックＢＰ側の回路構成〕
電池パックＢＰ内の二次電池ＲＢは、二次電池ＲＢの高電位端（電池セルＣ１の正極）から正極側電力線ＰＬ１を経て出力端子Ｔ１へ接続され、又、二次電池ＲＢの低電位端（電池セル電池セルＣ３の負極）から負極側電力線ＰＬ２を経て出力端子Ｔ２へ接続されている。
二次電池ＲＢの高電位端（電池セルＣ１の正極）及び低電位端（電池セルＣ３の負極）には、更に、二次電池ＲＢの電圧をモニタするための一対の電池電圧検出用信号出力端子Ｔ３，Ｔ４に至る配線である正極側信号線ＳＬ１及び負極側信号線ＳＬ２の一端が夫々接続されている。
このように、正極側電力線ＰＬ１及び負極側電力線ＰＬ２と、正極側信号線ＳＬ１及び負極側信号線ＳＬ２とを別個に備えているのは、大電流が流れる正極側電力線ＰＬ１及び負極側電力線ＰＬ２での電圧降下によって二次電池ＲＢの電圧の検出精度が低下するのを回避するためである。
この正極側信号線ＳＬ１の途中箇所、換言すると、二次電池ＲＢから電池電圧検出用信号出力端子Ｔ３に至るまでの配線の途中箇所には、その配線の通電を入り切りする第２スイッチ装置３が備えられている。 [Circuit configuration on the battery pack BP side]
The secondary battery RB in the battery pack BP is connected from the high potential end of the secondary battery RB (the positive electrode of the battery cell C1) to the output terminal T1 via the positive power line PL1, and also the low potential end of the secondary battery RB. The battery cell is connected to the output terminal T2 via the negative power line PL2 from the negative electrode of the battery cell C3.
A pair of battery voltage detection signal outputs for monitoring the voltage of the secondary battery RB is further provided at the high potential end (positive electrode of the battery cell C1) and the low potential end (negative electrode of the battery cell C3) of the secondary battery RB. One end of the positive signal line SL1 and the negative signal line SL2 which are wirings extending to the terminals T3 and T4 are respectively connected.
As described above, the positive power line PL1 and the negative power line PL2, and the positive signal line SL1 and the negative signal line SL2 are separately provided in the positive power line PL1 and the negative power line PL2 through which a large current flows. This is to prevent the voltage detection accuracy of the secondary battery RB from being reduced due to the voltage drop.
A second switch device 3 for turning on and off the wiring is provided at an intermediate position of the positive signal line SL1, in other words, at an intermediate position of the wiring from the secondary battery RB to the battery voltage detection signal output terminal T3. Is provided.

電池監視装置ＧＣは、上述のように二次電池ＲＢが適正な動作状態にあるか否かを監視するのであるが、より具体的には、二次電池ＲＢの各電池セルＣ１，Ｃ２，Ｃ３毎に、各電池セルＣ１，Ｃ２，Ｃ３が過放電状態にあるか否かを検出する。
正極側電力線ＰＬ１の途中箇所には、この電池監視装置ＧＣからの制御信号によって入り状態と切り状態とに切換えられる過放電防止用スイッチ装置１が備えられている。
この過放電防止用スイッチ装置１が入り状態であるときは、電池セルＣ１の正極と出力端子Ｔ１との間が通電状態となり、負荷機器に接続された放電時には、出力端子Ｔ１，Ｔ２から負荷機器へ電力を供給し、後述の充電器ＣＨに接続された充電時には、充電器ＣＨから出力端子Ｔ１，Ｔ２を経て充電電流が二次電池ＲＢに流入する。
一方、電池監視装置ＧＣが、二次電池ＲＢが過放電状態にあると検出して、この過放電防止用スイッチ装置１を切り状態に切換えたときは、電池セルＣ１の正極と出力端子Ｔ１との間が非通電状態となり、負荷機器への放電は行われない。 The battery monitoring device GC monitors whether or not the secondary battery RB is in an appropriate operating state as described above. More specifically, the battery cells C1, C2, and C3 of the secondary battery RB are monitored. Every time, it is detected whether or not each battery cell C1, C2, C3 is in an overdischarged state.
An overdischarge prevention switch device 1 that is switched between the on state and the off state by a control signal from the battery monitoring device GC is provided in the middle of the positive power line PL1.
When this overdischarge prevention switch device 1 is in the on state, the positive electrode of the battery cell C1 and the output terminal T1 are energized, and when discharging is connected to the load device, the load device starts from the output terminals T1 and T2. At the time of charging connected to a later-described charger CH, a charging current flows into the secondary battery RB from the charger CH via the output terminals T1 and T2.
On the other hand, when the battery monitoring device GC detects that the secondary battery RB is in the overdischarge state and switches the overdischarge prevention switch device 1 to the off state, the positive electrode of the battery cell C1 and the output terminal T1 Is not energized, and no discharge to the load equipment is performed.

電池監視装置ＧＣの動作用の電力は二次電池ＲＢから供給を受けるため、正極側電力線ＰＬ１と負極側電力線ＰＬ２とに接続されている。
更に、各電池セルＣ１，Ｃ２，Ｃ３夫々の電圧を測定するために、各電池セルＣ１，Ｃ２，Ｃ３の正極及び負極の近傍位置から電圧検出用の信号線が引き出されて電池監視装置ＧＣに接続されている。
これらの二次電池ＲＢと電池監視装置ＧＣとの間の配線には、二次電池ＲＢから電池監視装置ＧＣへの通電を入り切りする第１スイッチ装置２が備えられている。
この第１スイッチ装置２は、より具体的には、二次電池ＲＢの高電位端（電池セルＣ１の正極）から、電池監視装置ＧＣを通過して、二次電池ＲＢの低電位端（電池セルＣ３の負極）に至る、電池監視装置ＧＣへの動作用の電力の供給経路（本実施の形態では、正極側電力線ＰＬ１及び負極側電力線ＰＬ２を経ている）の途中箇所に備えられる電力供給経路用スイッチ装置２ａと、各電池セルＣ１，Ｃ２，Ｃ３の正極及び負極から電池監視装置ＧＣへ引込まれる配線の途中箇所に配置される電圧検出線用スイッチ装置２ｂとから成っている。 Since power for operation of the battery monitoring device GC is supplied from the secondary battery RB, it is connected to the positive power line PL1 and the negative power line PL2.
Further, in order to measure the voltage of each battery cell C1, C2, C3, a voltage detection signal line is drawn from the position near the positive electrode and the negative electrode of each battery cell C1, C2, C3, and is sent to the battery monitoring device GC. It is connected.
A wiring between the secondary battery RB and the battery monitoring device GC is provided with a first switch device 2 for turning on and off the energization from the secondary battery RB to the battery monitoring device GC.
More specifically, the first switch device 2 passes from the high potential end of the secondary battery RB (the positive electrode of the battery cell C1) through the battery monitoring device GC and passes through the low potential end (battery of the secondary battery RB). Power supply path provided in the middle of the power supply path for operation to the battery monitoring device GC (in this embodiment, via the positive power line PL1 and the negative power line PL2) leading to the negative electrode of the cell C3) Switch device 2a, and a voltage detection line switch device 2b arranged in the middle of the wiring drawn into the battery monitoring device GC from the positive and negative electrodes of the battery cells C1, C2, C3.

上記第１スイッチ装置２及び第２スイッチ装置３の入り切り制御用の制御端子は、全て、電池パックＢＰの制御信号入力端子Ｔ５に接続されており、制御信号入力端子Ｔ５への入力信号によって、第１スイッチ装置２及び第２スイッチ装置３の全てが一斉に入り状態と切り状態とに切換えられる。   The control terminals for on / off control of the first switch device 2 and the second switch device 3 are all connected to the control signal input terminal T5 of the battery pack BP, and the first signal is input to the control signal input terminal T5. All of the 1 switch device 2 and the second switch device 3 are switched on and off simultaneously.

〔充電器ＣＨの概略構成〕
次ぎに、上記構成の電池パックＢＰの二次電池ＲＢに充電する充電器ＣＨについて説明する。
充電器ＣＨには、図２に示すように、電源プラグ１１から供給される交流電力を整流して電池パックＢＰの二次電池ＲＢに充電電流を供給する充電回路１２と、充電回路１２が二次電池ＲＢに対する充電電流や充電電圧を制御するために二次電池ＲＢの電圧情報を充電回路１２へ出力する電圧検出部１３と、電池パックＢＰの第１スイッチ装置２及び第２スイッチ装置３の入り切りを制御するスイッチ制御部１４と、電池パックＢＰが充電器ＣＨから離脱されたことを検知する離脱検知部１５とが備えられている。 [Schematic configuration of charger CH]
Next, the charger CH that charges the secondary battery RB of the battery pack BP having the above configuration will be described.
As shown in FIG. 2, the charger CH has two charging circuits 12 that rectify AC power supplied from the power plug 11 and supply a charging current to the secondary battery RB of the battery pack BP, and two charging circuits 12. A voltage detector 13 that outputs voltage information of the secondary battery RB to the charging circuit 12 in order to control a charging current and a charging voltage for the secondary battery RB, and the first switch device 2 and the second switch device 3 of the battery pack BP. A switch control unit 14 that controls on / off switching and a disconnection detection unit 15 that detects that the battery pack BP is disconnected from the charger CH are provided.

上記の充電器ＣＨ内の各回路は、充電出力端子Ｔ１１，Ｔ１２、電圧信号入力端子Ｔ１３，Ｔ１４及び制御信号出力端子Ｔ１５に接続されている。
電池パックＢＰと充電器ＣＨとを接続した状態で、充電出力端子Ｔ１１，Ｔ１２は電池パックＢＰの出力端子Ｔ１，Ｔ２に接続され、電圧信号入力端子Ｔ１３，Ｔ１４は電池パックＢＰの電池電圧検出用信号出力端子Ｔ３，Ｔ４に接続され、充電出力端子Ｔ１２は電池パックＢＰの制御信号入力端子Ｔ５に接続される。
図２では、互いに接続される端子同士を同じ記号によって示している。 Each circuit in the charger CH is connected to charging output terminals T11 and T12, voltage signal input terminals T13 and T14, and a control signal output terminal T15.
In a state where the battery pack BP and the charger CH are connected, the charging output terminals T11 and T12 are connected to the output terminals T1 and T2 of the battery pack BP, and the voltage signal input terminals T13 and T14 are for detecting the battery voltage of the battery pack BP. The signal output terminals T3 and T4 are connected, and the charge output terminal T12 is connected to the control signal input terminal T5 of the battery pack BP.
In FIG. 2, the terminals connected to each other are indicated by the same symbol.

〔第１スイッチ装置２及び第２スイッチ装置３の制御〕
第１スイッチ装置２及び第２スイッチ装置３の入り状態と切り状態との切換えは、上述のように、スイッチ制御部１４の制御によって実行される。
この制御のためにスイッチ制御部１４から出力されている制御信号は単一であり、図１に示す配線接続のように、このスイッチ制御部１４から出力される単一の信号で５つの第１スイッチ装置２及び第２スイッチ装置３の全てを切換える。
換言すると、スイッチ制御部１４からの第２スイッチ装置３を切り状態に切換える信号によって、第１スイッチ装置２が切り状態に切換えられるように構成されている。
スイッチ制御部１４は、二次電池ＲＢの電圧をモニタする必要のないときに、第２スイッチ装置３を切り状態に切換える信号を出力する。この信号によって、上記のように第１スイッチ装置２及び第２スイッチ装置３の全てが切り状態となる。
この二次電池ＲＢの電圧をモニタする必要のないときとは、具体的には、二次電池ＲＢへの充電を停止しているときであり、本実施の形態では、スイッチ制御部１４は、電源プラグ１１がコンセントから引き抜かれたのを充電回路１２が検知したときに、電池パックＢＰの第１スイッチ装置２及び第２スイッチ装置３を切り状態とする信号を出力する。
これによって、電池パックＢＰを充電器ＣＨに接続したままの状態でも、二次電池ＲＢから電池監視装置ＧＣへの通電を入り切りする第１スイッチ装置２が切り状態となって電池監視装置ＧＣへの通電が停止されると共に、二次電池ＲＢから電池電圧検出用信号出力端子Ｔ３を経て電圧検出部１３に至る配線の途中箇所にその配線の通電を入り切りするために備えられている第２スイッチ装置３が切り状態となって、その配線を通じた二次電池ＲＢからの電流の漏れが阻止される。 [Control of first switch device 2 and second switch device 3]
The switching between the on state and the off state of the first switch device 2 and the second switch device 3 is executed by the control of the switch control unit 14 as described above.
The control signal output from the switch control unit 14 for this control is a single signal, and five first signals are output from the switch control unit 14 as shown in FIG. All of the switch device 2 and the second switch device 3 are switched.
In other words, the first switch device 2 is configured to be switched to the cut-off state by a signal from the switch control unit 14 that switches the second switch device 3 to the cut-off state.
When it is not necessary to monitor the voltage of the secondary battery RB, the switch control unit 14 outputs a signal for switching the second switch device 3 to the off state. By this signal, all of the first switch device 2 and the second switch device 3 are turned off as described above.
The time when there is no need to monitor the voltage of the secondary battery RB is specifically when charging of the secondary battery RB is stopped. In the present embodiment, the switch control unit 14 When the charging circuit 12 detects that the power plug 11 has been pulled out from the outlet, a signal for turning off the first switch device 2 and the second switch device 3 of the battery pack BP is output.
As a result, even when the battery pack BP is still connected to the charger CH, the first switch device 2 that turns on / off the power supply from the secondary battery RB to the battery monitoring device GC is turned off and the battery monitoring device GC is turned off. A second switch device is provided to stop energization and to energize the wiring in the middle of the wiring from the secondary battery RB through the battery voltage detection signal output terminal T3 to the voltage detector 13. 3 is cut off, and current leakage from the secondary battery RB through the wiring is prevented.

一方、電池パックＢＰを充電器ＣＨから取外す際にも、第１スイッチ装置２及び第２スイッチ装置３を切り状態とする機能が備えられており、電池パックＢＰを充電器ＣＨから離脱させるべく移動操作が開始されると、離脱検知部１５がその動きを検知してスイッチ制御部１４へ報知する。
この信号を受け取ったスイッチ制御部１４は、電池パックＢＰの端子群（Ｔ１〜Ｔ５）と充電器ＣＨの端子群（Ｔ１１〜Ｔ１５）が離間する前に、第１スイッチ装置２及び第２スイッチ装置３を切り状態とする信号を出力する。
この信号を受け取った第１スイッチ装置２及び第２スイッチ装置３は切り状態に切換えられて、電池パックＢＰを充電器ＣＨから取外した状態で放置しても、電池監視装置ＧＣによる二次電池ＲＢの消耗を回避できる。
尚、電池パックＢＰを負荷機器あるいは充電器ＣＨに接続したときは、図示を省略する復帰装置によって第１スイッチ装置２及び第２スイッチ装置３が切り状態から入り状態に切換えられる。 On the other hand, when the battery pack BP is removed from the charger CH, the function of turning off the first switch device 2 and the second switch device 3 is provided, and the battery pack BP is moved to be detached from the charger CH. When the operation is started, the separation detection unit 15 detects the movement and notifies the switch control unit 14 of the movement.
Upon receiving this signal, the switch control unit 14 receives the first switch device 2 and the second switch device before the terminal group (T1 to T5) of the battery pack BP and the terminal group (T11 to T15) of the charger CH are separated from each other. A signal for turning 3 off is output.
The first switch device 2 and the second switch device 3 that have received this signal are switched to the cut-off state, and even if the battery pack BP is removed from the charger CH, the secondary battery RB by the battery monitoring device GC is left. Can be avoided.
When the battery pack BP is connected to the load device or the charger CH, the first switch device 2 and the second switch device 3 are switched from the cut-off state to the on-state by a return device (not shown).

〔別実施形態〕
以下、本発明の別実施形態を列記する。
（１）上記実施の形態では、電池パックＢＰと充電器ＣＨとの離脱を検知して、第１スイッチ装置２及び第２スイッチ装置３を切り状態とする制御機能を充電器ＣＨ側に設ける場合を例示したが、電池パックＢＰ側にこの機能を備えるようにしても良い。
この際、電池パックＢＰと充電器ＣＨとの離脱によって、電池電圧検出用信号出力端子Ｔ３と電圧信号入力端子Ｔ１３とは離間して、この配線を通じた電流の漏れは遮断されるので、第１スイッチ装置２のみを切り状態とする制御を行うようにしても良い。 [Another embodiment]
Hereinafter, other embodiments of the present invention will be listed.
(1) In the above embodiment, when the battery switch BP and the charger CH are detected to be detached and the control function for turning off the first switch device 2 and the second switch device 3 is provided on the charger CH side. However, this function may be provided on the battery pack BP side.
At this time, since the battery pack BP and the charger CH are separated from each other, the battery voltage detection signal output terminal T3 and the voltage signal input terminal T13 are separated from each other, and current leakage through the wiring is cut off. Control may be performed so that only the switch device 2 is turned off.

（２）上記実施の形態では、電池監視装置ＧＣは、二次電池ＲＢが適正な動作状態にないことを検出すると過放電防止用スイッチ装置１を切り状態に切換えて、二次電池ＲＢの保護装置として機能する場合を例示しているが、二次電池ＲＢが適正な動作状態にないことを検出すると、電池パックＢＰを接続している負荷機器等にその旨を報知する機能だけを備えるようにしても良い。
（３）上記実施の形態では、二次電池ＲＢが適正な動作状態にあるか否かの電池監視装置ＧＣによる監視として、二次電池ＲＢが過放電状態にあるか否かを検出する場合を例示しているが、二次電池ＲＢが過充電状態にあるか否かを監視するようにしても良い。 (2) In the above embodiment, when the battery monitoring device GC detects that the secondary battery RB is not in an appropriate operation state, the overdischarge prevention switch device 1 is switched to the off state to protect the secondary battery RB. Although the case of functioning as a device is illustrated, it is only provided with a function of notifying a load device or the like connected to the battery pack BP when detecting that the secondary battery RB is not in an appropriate operating state. Anyway.
(3) In the above embodiment, the monitoring by the battery monitoring device GC as to whether or not the secondary battery RB is in an appropriate operating state is a case where it is detected whether or not the secondary battery RB is in an overdischarged state. Although illustrated, it may be configured to monitor whether or not the secondary battery RB is in an overcharged state.

本発明の実施の形態にかかる電池パックの回路図1 is a circuit diagram of a battery pack according to an embodiment of the present invention. 本発明の実施の形態にかかる充電器のブロック構成図The block block diagram of the charger concerning embodiment of this invention

符号の説明Explanation of symbols

２ 第１スイッチ装置
２ａ（２） 電力供給経路用スイッチ装置（第１スイッチ装置）
２ｂ（２） 電圧検出線用スイッチ装置（第１スイッチ装置）
３ 第２スイッチ装置
１３ 電圧検出部
１４ スイッチ制御部
ＢＰ 電池パック
ＣＨ 充電器
ＧＣ 電池監視装置
ＲＢ 二次電池
Ｔ３，Ｔ４ 電池電圧検出用信号出力端子 2 1st switch apparatus 2a (2) Power supply path switch apparatus (1st switch apparatus)
2b (2) Voltage detection line switch device (first switch device)
3 Second switch device 13 Voltage detection unit 14 Switch control unit BP Battery pack CH Charger GC Battery monitoring device RB Secondary battery T3, T4 Battery voltage detection signal output terminal

Claims (3)

二次電池と、その二次電池の電圧をモニタするための電池電圧検出用信号出力端子とが備えられた電池パックを、充電器に接続して充電する電池パックの充電システムであって、
前記充電器に、前記電池電圧検出用信号出力端子に接続される電圧検出部が備えられ、前記二次電池から前記電池電圧検出用信号出力端子を経て前記充電器の前記電圧検出部に至る配線の途中箇所に、その配線の通電を入り切りする第２スイッチ装置が備えられ、
前記充電器に、前記二次電池の電圧をモニタする必要のないときに、前記第２スイッチ装置を切り状態に切換えるスイッチ制御部が備えられている電池パックの充電システム。 A battery pack charging system for charging a battery pack provided with a secondary battery and a battery voltage detection signal output terminal for monitoring the voltage of the secondary battery by connecting to a charger,
The charger is provided with a voltage detection unit connected to the battery voltage detection signal output terminal, and the wiring from the secondary battery to the voltage detection unit of the charger through the battery voltage detection signal output terminal Is provided with a second switch device for turning on and off the wiring in the middle of
A battery pack charging system, wherein the charger is provided with a switch control unit that switches the second switch device to a turned-off state when it is not necessary to monitor the voltage of the secondary battery. 前記第２スイッチ装置は、前記二次電池から前記電池電圧検出用信号出力端子に至るまでの配線の途中箇所に備えられている請求項１記載の電池パックの充電システム。   2. The battery pack charging system according to claim 1, wherein the second switch device is provided at an intermediate point of wiring from the secondary battery to the battery voltage detection signal output terminal. 3. 前記電池パックに、前記二次電池が適正な動作状態にあるか否かを監視する電池監視装置と、前記二次電池から前記電池監視装置への通電を入り切りする第１スイッチ装置とが備えられ、
前記スイッチ制御部からの前記第２スイッチ装置を切り状態に切換える信号によって、前記第１スイッチ装置が切り状態に切換えられるように構成されている請求項２記載の電池パックの充電システム。 The battery pack includes a battery monitoring device that monitors whether or not the secondary battery is in an appropriate operating state, and a first switch device that turns on and off the power supply from the secondary battery to the battery monitoring device. ,
3. The battery pack charging system according to claim 2, wherein the first switch device is switched to a cut-off state by a signal for switching the second switch device to a cut-off state from the switch control unit.
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JP2011035982A (en) * 2009-07-30 2011-02-17 Hitachi Koki Co Ltd Battery pack
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