JP2018125936A - Battery pack - Google Patents

Battery pack Download PDF

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JP2018125936A
JP2018125936A JP2017015124A JP2017015124A JP2018125936A JP 2018125936 A JP2018125936 A JP 2018125936A JP 2017015124 A JP2017015124 A JP 2017015124A JP 2017015124 A JP2017015124 A JP 2017015124A JP 2018125936 A JP2018125936 A JP 2018125936A
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battery
switch
battery pack
terminal
batteries
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JP6772864B2 (en
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宏昌 吉澤
Hiromasa Yoshizawa
宏昌 吉澤
俊雄 小田切
Toshio Odagiri
俊雄 小田切
洋明 加藤
Hiroaki Kato
洋明 加藤
裕人 佐藤
Hiroto Sato
裕人 佐藤
正彰 鈴木
Masaaki Suzuki
正彰 鈴木
西垣　研治
Kenji Nishigaki
研治 西垣
隆介 長谷
Ryusuke Hase
隆介 長谷
慎司 広瀬
Shinji Hirose
慎司 広瀬
悟士 山本
Satoshi Yamamoto
悟士 山本
真一 会沢
Shinichi Aizawa
真一 会沢
筒井　雄介
Yusuke Tsutsui
雄介 筒井
順一 波多野
Junichi Hatano
順一 波多野
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Toyota Industries Corp
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Toyota Industries 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

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  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)

Abstract

PROBLEM TO BE SOLVED: To prevent short circuit of a positive electrode terminal and a negative electrode terminal of each battery caused by malfunction of a switch for switching between parallel connection and serial connection of each battery in a battery pack having a plurality of batteries.SOLUTION: One end of a switch SW1 is connected with one end of a battery B1. The other end of the switch SW1 is connected with one end of a battery B2. One end of a switch SW2 is connected with the other end of the battery B1. The other end of the switch SW2 is connected with the other end of the battery B2. An anode of a diode D is connected with the other end of the battery B1. A cathode of the diode D1 is connected with the other end of the battery B2. When the battery B1 and the battery B2 are connected in parallel, a controller 11 conducts the switches SW1 and SW2. When the battery B1 and the battery B2 are connected in series, the controller 11 interrupts the switches SW1 and SW2.SELECTED DRAWING: Figure 1

Description

本発明は、複数の電池を備える電池パックに関する。   The present invention relates to a battery pack including a plurality of batteries.

複数の電池を備える電池パックとして、例えば、第１の電池の正極端子と第２の電池の正極端子との間に第１のスイッチが接続され、第１の電池の負極端子と第２の電池の負極端子との間に第２のスイッチが接続され、第１の電池の負極端子と第２のスイッチとの接続点と、第２の電池の正極端子と第１のスイッチとの接続点との間に第３のスイッチが接続され、第１及び第２の電池の並列接続時、第１及び第２のスイッチが導通されるとともに第３のスイッチが遮断され、第１及び第２の電池の直列接続時、第１及び第２のスイッチが遮断されるとともに第３のスイッチが導通されるものがある。関連する技術として、例えば、特許文献１がある。   As a battery pack including a plurality of batteries, for example, a first switch is connected between the positive terminal of the first battery and the positive terminal of the second battery, and the negative terminal of the first battery and the second battery. A second switch is connected between the negative terminal of the first battery, a connection point between the negative terminal of the first battery and the second switch, and a connection point between the positive terminal of the second battery and the first switch. A third switch is connected between the first and second batteries, and when the first and second batteries are connected in parallel, the first and second switches are turned on and the third switch is turned off. In some cases, the first and second switches are cut off and the third switch is turned on during serial connection. As a related technique, there is, for example, Patent Document 1.

このように構成される電池パックでは、電池パックから負荷への電力供給時（第１及び第２の電池の放電時）、第１及び第２の電池が並列接続され、充電器から電池パックへの電力供給時（第１及び第２の電池の充電時）、第１及び第２の電池が直列接続される。   In the battery pack configured as described above, when power is supplied from the battery pack to the load (when the first and second batteries are discharged), the first and second batteries are connected in parallel, and the charger to the battery pack. When the power is supplied (when the first and second batteries are charged), the first and second batteries are connected in series.

特開平８−１７２７３３号公報JP-A-8-172733

しかしながら、上述のように構成される電池パックでは、電池パックから負荷への電力供給時（第１及び第２のスイッチの導通時）、第３のスイッチが誤動作して第３のスイッチも導通してしまうと、第１及び第２の電池のそれぞれの正極端子と負極端子が短絡してしまうという懸念がある。   However, in the battery pack configured as described above, when power is supplied from the battery pack to the load (when the first and second switches are turned on), the third switch malfunctions and the third switch is also turned on. If this happens, there is a concern that the positive electrode terminal and the negative electrode terminal of each of the first and second batteries are short-circuited.

本発明の一側面に係る目的は、各電池の並列接続と直列接続の切り替えのためのスイッチの誤動作による各電池の正極端子と負極端子の短絡を防止することが可能な電池パックを提供することである。   An object of one aspect of the present invention is to provide a battery pack capable of preventing a short circuit between a positive electrode terminal and a negative electrode terminal of each battery due to a malfunction of a switch for switching between parallel connection and series connection of the batteries. It is.

本発明に係る一つの形態である電池パックは、第１及び第２の電池と、第１及び第２のスイッチと、制御部と、ダイオードとを備える。
第１の電池は、第１及び第２の電池の並列接続時に一端が負荷の一端に接続され、第１及び第２の電池の並列接続時並びに第１及び第２の電池の直列接続時に他端が負荷の他端と接続される。 A battery pack according to one embodiment of the present invention includes first and second batteries, first and second switches, a control unit, and a diode.
One end of the first battery is connected to one end of the load when the first and second batteries are connected in parallel, and the other one is connected when the first and second batteries are connected in parallel and when the first and second batteries are connected in series. One end is connected to the other end of the load.

第１のスイッチは、一端が第１の電池の一端に接続され、他端が第２の電池の一端に接続される。
第２のスイッチは、一端が第１の電池の他端に接続され、他端が第２の電池の他端に接続される。 The first switch has one end connected to one end of the first battery and the other end connected to one end of the second battery.
The second switch has one end connected to the other end of the first battery and the other end connected to the other end of the second battery.

制御部は、第１及び第２の電池の並列接続時、第１及び第２のスイッチを導通させ、第１及び第２の電池の直列接続時、第１及び第２のスイッチを遮断させる。
ダイオードは、第１の電池の他端と第２の電池の一端との間に接続される。 The controller causes the first and second switches to conduct when the first and second batteries are connected in parallel, and shuts off the first and second switches when the first and second batteries are connected in series.
The diode is connected between the other end of the first battery and one end of the second battery.

本発明によれば、複数の電池を備える電池パックにおいて、各電池の並列接続と直列接続の切り替えのためのスイッチの誤動作による各電池の正極端子と負極端子の短絡を防止することができる。   ADVANTAGE OF THE INVENTION According to this invention, in a battery pack provided with a some battery, the short circuit of the positive electrode terminal and negative electrode terminal of each battery by the malfunctioning of the switch for switching of the parallel connection of each battery and a serial connection can be prevented.

実施形態の電池パックの一例を示す図である。It is a figure which shows an example of the battery pack of embodiment. 制御部の動作の一例を示すフローチャートである。It is a flowchart which shows an example of operation | movement of a control part. 実施形態の電池パックの変形例１を示す図である。It is a figure which shows the modification 1 of the battery pack of embodiment. 実施形態の電池パックの変形例２を示す図である。It is a figure which shows the modification 2 of the battery pack of embodiment. 実施形態の電池パックの変形例３を示す図である。It is a figure which shows the modification 3 of the battery pack of embodiment. 実施形態の電池パックの変形例４を示す図である。It is a figure which shows the modification 4 of the battery pack of embodiment. 実施形態の電池パックの変形例５を示す図である。It is a figure which shows the modification 5 of the battery pack of embodiment. 実施形態の電池パックの変形例６を示す図である。It is a figure which shows the modification 6 of the battery pack of embodiment. 実施形態の電池パックの変形例７を示す図である。It is a figure which shows the modification 7 of the battery pack of embodiment.

以下図面に基づいて実施形態について詳細を説明する。
図１は、実施形態の電池パックの一例を示す図である。
図１に示す電池パック１は、電池Ｂ１（第１の電池）と、電池Ｂ２（第２の電池）と、スイッチＳＷ１（第１のスイッチ）と、スイッチＳＷ２（第２のスイッチ）と、スイッチＳＷ３（第３のスイッチ）と、ダイオードＤと、電池パック側端子Ｔｂ１と、電池パック側端子Ｔｂ２と、電池パック側端子Ｔｂ３と、制御部１１とを備える。なお、電池パック１は、例えば、電動フォークリフトやプラグインハイブリッド車などの車両に搭載されるものとする。また、図１に示す負荷Ｌｏは、例えば、走行用モータを駆動するためのインバータとする。 Hereinafter, embodiments will be described in detail with reference to the drawings.
Drawing 1 is a figure showing an example of a battery pack of an embodiment.
A battery pack 1 shown in FIG. 1 includes a battery B1 (first battery), a battery B2 (second battery), a switch SW1 (first switch), a switch SW2 (second switch), and a switch. SW3 (third switch), a diode D, a battery pack side terminal Tb1, a battery pack side terminal Tb2, a battery pack side terminal Tb3, and a control unit 11 are provided. In addition, the battery pack 1 shall be mounted in vehicles, such as an electric forklift and a plug-in hybrid vehicle, for example. Further, the load Lo shown in FIG. 1 is, for example, an inverter for driving a traveling motor.

ジャンパプラグＰｊは、電池パック１に着脱可能に構成され、電池パック１から負荷Ｌｏへの電力供給時（電池Ｂ１、Ｂ２の放電時）、ユーザによって電池パック１に接続される。また、ジャンパプラグＰｊは、充電器２から電池パック１への電力供給時（電池Ｂ１、Ｂ２の充電時）、ユーザによって電池パック１から外される。また、ジャンパプラグＰｊは、ジャンパプラグ側端子Ｔｊ１と、ジャンパプラグ側端子Ｔｊ２と、ジャンパ線Ｌｊとを備える。ジャンパプラグ側端子Ｔｊ１とジャンパプラグ側端子Ｔｊ２はジャンパ線Ｌｊを介して互いに接続される。   The jumper plug Pj is configured to be detachable from the battery pack 1 and is connected to the battery pack 1 by the user when power is supplied from the battery pack 1 to the load Lo (when the batteries B1 and B2 are discharged). The jumper plug Pj is removed from the battery pack 1 by the user when power is supplied from the charger 2 to the battery pack 1 (when charging the batteries B1 and B2). The jumper plug Pj includes a jumper plug side terminal Tj1, a jumper plug side terminal Tj2, and a jumper line Lj. The jumper plug side terminal Tj1 and the jumper plug side terminal Tj2 are connected to each other via a jumper line Lj.

充電器２は、充電ケーブルＣｃと、その充電ケーブルＣｃの先端に設けられる充電プラグＰｃとを備える。
充電プラグＰｃは、電池パック１に着脱可能に構成され、充電器２から電池パック１への電力供給時、ユーザによって電池パック１に接続される。また、充電プラグＰｃは、電池パック１から負荷Ｌｏへの電力供給時、ユーザによって電池パック１から外される。また、充電プラグＰｃは、充電プラグ側端子Ｔｃ１と、充電プラグ側端子Ｔｃ２とを備える。充電プラグ側端子Ｔｃ１は、充電ケーブルＣｃを介して充電器２の正極端子Ｔｃ＋に接続され、充電プラグ側端子Ｔｃ２は、充電ケーブルＣｃを介して充電器２の負極端子Ｔｃ−に接続される。 The charger 2 includes a charging cable Cc and a charging plug Pc provided at the tip of the charging cable Cc.
The charging plug Pc is configured to be detachable from the battery pack 1 and is connected to the battery pack 1 by a user when power is supplied from the charger 2 to the battery pack 1. The charging plug Pc is removed from the battery pack 1 by the user when power is supplied from the battery pack 1 to the load Lo. The charging plug Pc includes a charging plug side terminal Tc1 and a charging plug side terminal Tc2. The charging plug side terminal Tc1 is connected to the positive terminal Tc + of the charger 2 via the charging cable Cc, and the charging plug side terminal Tc2 is connected to the negative terminal Tc− of the charger 2 via the charging cable Cc.

電池Ｂ１、Ｂ２は、例えば、リチウムイオン電池やニッケル水素電池などの二次電池により構成される。また、電池Ｂ１、Ｂ２は、それぞれ、互いに直列接続される複数の二次電池により構成されてもよいし、互いに並列接続される複数の二次電池により構成されてもよいし、互いに直列接続される複数の二次電池で構成される組電池が複数互いに並列接続されて構成されてもよい。   The batteries B1 and B2 are constituted by secondary batteries such as lithium ion batteries and nickel metal hydride batteries, for example. Each of the batteries B1 and B2 may be configured by a plurality of secondary batteries connected in series with each other, may be configured by a plurality of secondary batteries connected in parallel with each other, or may be connected in series with each other. A plurality of assembled batteries including a plurality of secondary batteries may be connected in parallel to each other.

スイッチＳＷ１〜ＳＷ３は、例えば、電磁式リレーやＭＯＳＦＥＴ（Metal Oxide Semiconductor Field Effect Transistor）などの半導体リレーにより構成される。スイッチＳＷ１は、一端が電池Ｂ１の正極端子（一端）に接続され、他端が電池Ｂ２の正極端子（一端）に接続される。スイッチＳＷ２は、一端が電池Ｂ１の負極端子（他端）に接続され、他端が電池Ｂ２の負極端子（他端）に接続される。スイッチＳＷ３は、一端が電池パック側端子Ｔｂ３に接続され、他端が電池Ｂ２の負極端子に接続される。   The switches SW1 to SW3 are configured by semiconductor relays such as electromagnetic relays and MOSFETs (Metal Oxide Semiconductor Field Effect Transistors), for example. The switch SW1 has one end connected to the positive terminal (one end) of the battery B1 and the other end connected to the positive terminal (one end) of the battery B2. The switch SW2 has one end connected to the negative terminal (the other end) of the battery B1 and the other end connected to the negative terminal (the other end) of the battery B2. The switch SW3 has one end connected to the battery pack side terminal Tb3 and the other end connected to the negative terminal of the battery B2.

ダイオードＤは、電池Ｂ１の負極端子と電池Ｂ２の正極端子との間に接続される。すなわち、ダイオードＤは、アノードが電池Ｂ１の負極端子とスイッチＳＷ２の一端に接続され、カソードが電池Ｂ２の正極端子とスイッチＳＷ１の他端に接続される。   The diode D is connected between the negative terminal of the battery B1 and the positive terminal of the battery B2. That is, the diode D has an anode connected to the negative terminal of the battery B1 and one end of the switch SW2, and a cathode connected to the positive terminal of the battery B2 and the other end of the switch SW1.

電池パック側端子Ｔｂ１は、負荷Ｌｏの正極端子Ｔｌ＋（一端）に接続される。なお、負荷Ｌｏの負極端子Ｔｌ−（他端）は、スイッチＳＷ２の一端や電池Ｂ１の負極端子とダイオードＤのアノードとの接続点に接続されている。   The battery pack side terminal Tb1 is connected to the positive terminal Tl + (one end) of the load Lo. Note that the negative terminal Tl− (the other end) of the load Lo is connected to one end of the switch SW2 or a connection point between the negative terminal of the battery B1 and the anode of the diode D.

電池パック側端子Ｔｂ２は、電池Ｂ１の正極端子及びスイッチＳＷ１の一端に接続される。
制御部１１は、例えば、ＣＰＵ（Central Processing Unit）、マルチコアＣＰＵ、プログラマブルなデバイス（ＦＰＧＡ（Field Programmable Gate Array）やＰＬＤ（Programmable Logic Device）など）により構成される。 The battery pack side terminal Tb2 is connected to the positive terminal of the battery B1 and one end of the switch SW1.
The control unit 11 includes, for example, a CPU (Central Processing Unit), a multi-core CPU, and a programmable device (FPGA (Field Programmable Gate Array), PLD (Programmable Logic Device, etc.)).

図２は、制御部１１の動作の一例を示すフローチャートである。
まず、制御部１１は、電池Ｂ１、Ｂ２の並列接続時（Ｓ１：Ｙｅｓ）、スイッチＳＷ１、ＳＷ２を導通させるともに、スイッチＳＷ３を遮断させる（Ｓ２）。 FIG. 2 is a flowchart illustrating an example of the operation of the control unit 11.
First, when the batteries B1 and B2 are connected in parallel (S1: Yes), the controller 11 turns on the switches SW1 and SW2 and turns off the switch SW3 (S2).

一方、制御部１１は、電池Ｂ１、Ｂ２の直列接続時（Ｓ１：Ｎｏ、Ｓ３：Ｙｅｓ）、スイッチＳＷ１、ＳＷ２を遮断させるとともに、スイッチＳＷ３を導通させる（Ｓ４）。
また、制御部１１は、電池Ｂ１、Ｂ２の並列接続時でもなく、電池Ｂ１、Ｂ２の直列接続時でもない場合（Ｓ１：Ｎｏ、Ｓ３：Ｎｏ）、例えば、スイッチＳＷ１〜ＳＷ３をすべて遮断させる。 On the other hand, when the batteries B1 and B2 are connected in series (S1: No, S3: Yes), the control unit 11 shuts off the switches SW1 and SW2 and makes the switch SW3 conductive (S4).
In addition, when the batteries B1 and B2 are not connected in parallel and the batteries B1 and B2 are not connected in series (S1: No, S3: No), the control unit 11 blocks all the switches SW1 to SW3, for example.

なお、図１に示す電池パック１において、スイッチＳＷ３を省略してもよい。スイッチＳＷ３を省略する場合、図２において、制御部１１は、電池Ｂ１、Ｂ２の並列接続時（Ｓ１：Ｙｅｓ）、スイッチＳＷ１、ＳＷ２を導通させる（Ｓ２）。また、制御部１１は、電池Ｂ１、Ｂ２の直列接続時（Ｓ１：Ｎｏ、Ｓ３：Ｙｅｓ）、スイッチＳＷ１、ＳＷ２を遮断させる（Ｓ４）。また、スイッチＳＷ３を省略する場合、電池Ｂ２の負極端子は、電池パック側端子Ｔｂ３に直接接続される。   In the battery pack 1 shown in FIG. 1, the switch SW3 may be omitted. When the switch SW3 is omitted, in FIG. 2, the control unit 11 causes the switches SW1 and SW2 to conduct (S2) when the batteries B1 and B2 are connected in parallel (S1: Yes). In addition, when the batteries B1 and B2 are connected in series (S1: No, S3: Yes), the control unit 11 turns off the switches SW1 and SW2 (S4). When the switch SW3 is omitted, the negative terminal of the battery B2 is directly connected to the battery pack side terminal Tb3.

例えば、制御部１１は、ジャンパプラグＰｊが電池パック１に接続されていることを検知している状態で負荷Ｌｏから電力要求を受け取ると、電池Ｂ１、Ｂ２の並列接続時であると判断し、スイッチＳＷ１、ＳＷ２を導通させるとともに、スイッチＳＷ３を遮断させる。なお、制御部１１は、ジャンパプラグＰｊが電池パック１に接続されていることを検知すると、電池Ｂ１、Ｂ２の並列接続時であると判断してもよい。   For example, when receiving a power request from the load Lo while detecting that the jumper plug Pj is connected to the battery pack 1, the control unit 11 determines that the batteries B1 and B2 are connected in parallel. The switches SW1 and SW2 are turned on and the switch SW3 is turned off. When detecting that the jumper plug Pj is connected to the battery pack 1, the control unit 11 may determine that the batteries B1 and B2 are connected in parallel.

ジャンパプラグＰｊが電池パック１に接続されると、電池パック側端子Ｔｂ１とジャンパプラグ側端子Ｔｊ１が電気的に接続されるとともに、電池パック側端子Ｔｂ２とジャンパプラグ側端子Ｔｊ２が電気的に接続される。また、スイッチＳＷ１、ＳＷ２が導通すると、電池Ｂ１の正極端子と電池Ｂ２の正極端子が電気的に接続され、電池Ｂ１の負極端子と電池Ｂ２の負極端子が電気的に接続される。   When the jumper plug Pj is connected to the battery pack 1, the battery pack side terminal Tb1 and the jumper plug side terminal Tj1 are electrically connected, and the battery pack side terminal Tb2 and the jumper plug side terminal Tj2 are electrically connected. The When the switches SW1 and SW2 are turned on, the positive terminal of the battery B1 and the positive terminal of the battery B2 are electrically connected, and the negative terminal of the battery B1 and the negative terminal of the battery B2 are electrically connected.

すると、電池Ｂ１の正極端子がジャンパ線Ｌｊを介して負荷Ｌｏの正極端子Ｔｌ＋に電気的に接続され、電池Ｂ２の正極端子がスイッチＳＷ１及びジャンパ線Ｌｊを介して負荷Ｌｏの正極端子Ｔｌ＋に電気的に接続され、電池Ｂ２の負極端子がスイッチＳＷ２を介して負荷Ｌｏの負極端子Ｔｌ−に電気的に接続される。なお、電池Ｂ１の負極端子は、電池Ｂ１、Ｂ２の並列接続時及び電池Ｂ１、Ｂ２の直列接続時において、負荷Ｌｏの負極端子Ｔｌ−に接続される。言い換えると、電池Ｂ１の負極端子は常に負荷Ｌｏの負極端子Ｔｌ−に接続される。   Then, the positive terminal of the battery B1 is electrically connected to the positive terminal Tl + of the load Lo via the jumper line Lj, and the positive terminal of the battery B2 is electrically connected to the positive terminal Tl + of the load Lo via the switch SW1 and the jumper line Lj. The negative terminal of the battery B2 is electrically connected to the negative terminal Tl− of the load Lo via the switch SW2. The negative terminal of the battery B1 is connected to the negative terminal Tl− of the load Lo when the batteries B1 and B2 are connected in parallel and when the batteries B1 and B2 are connected in series. In other words, the negative terminal of the battery B1 is always connected to the negative terminal Tl− of the load Lo.

このように、ジャンパプラグＰｊが電池パック１に接続された状態でスイッチＳＷ１、ＳＷ２が導通すると、並列接続された電池Ｂ１、Ｂ２から負荷Ｌｏへ電力を供給することが可能な状態になる。そして、電池Ｂ１、Ｂ２から負荷Ｌｏへ電力が供給されると、電池Ｂ１の正極端子からジャンパ線Ｌｊ及び負荷Ｌｏを介して電池Ｂ１の負極端子へ電流が流れるとともに、電池Ｂ２の正極端子からスイッチＳＷ１、ジャンパ線Ｌｊ、負荷Ｌｏ、及びスイッチＳＷ２を介して電池Ｂ２の負極端子へ電流が流れる。   As described above, when the switches SW1 and SW2 are turned on with the jumper plug Pj connected to the battery pack 1, power can be supplied from the batteries B1 and B2 connected in parallel to the load Lo. When power is supplied from the batteries B1 and B2 to the load Lo, a current flows from the positive terminal of the battery B1 to the negative terminal of the battery B1 via the jumper line Lj and the load Lo, and a switch is performed from the positive terminal of the battery B2. A current flows to the negative terminal of the battery B2 via SW1, the jumper line Lj, the load Lo, and the switch SW2.

例えば、制御部１１は、充電プラグＰｃが電池パック１に接続されていることを検知している状態で充電器２から充電指示を受け取ると、電池Ｂ１、Ｂ２の直列接続時であると判断し、スイッチＳＷ１、ＳＷ２を遮断させるとともに、スイッチＳＷ３を導通させる。なお、制御部１１は、充電プラグＰｃが電池パック１に接続されていることを検知すると、電池Ｂ１、Ｂ２の直列接続時であると判断してもよい。   For example, when the control unit 11 receives a charging instruction from the charger 2 while detecting that the charging plug Pc is connected to the battery pack 1, it determines that the batteries B1 and B2 are in series connection. The switches SW1 and SW2 are turned off and the switch SW3 is turned on. Note that when the control unit 11 detects that the charging plug Pc is connected to the battery pack 1, it may determine that the batteries B1 and B2 are connected in series.

充電プラグＰｃが電池パック１に接続されると、電池パック側端子Ｔｂ２と充電プラグ側端子Ｔｃ１とが電気的に接続されるとともに、電池パック側端子Ｔｂ３と充電プラグ側端子Ｔｃ２とが電気的に接続される。また、スイッチＳＷ３の一端が充電器２（充電プラグ側端子Ｔｃ２）に接続されるため、スイッチＳＷ３が導通すると、電池Ｂ２の他端（負極端子）と充電器２（充電プラグ側端子Ｔｃ２）とが電気的に接続される。   When the charging plug Pc is connected to the battery pack 1, the battery pack side terminal Tb2 and the charging plug side terminal Tc1 are electrically connected, and the battery pack side terminal Tb3 and the charging plug side terminal Tc2 are electrically connected. Connected. Further, since one end of the switch SW3 is connected to the charger 2 (charging plug side terminal Tc2), when the switch SW3 is turned on, the other end (negative electrode terminal) of the battery B2 and the charger 2 (charging plug side terminal Tc2) Are electrically connected.

すると、電池Ｂ１の正極端子が充電プラグＰｃ及び充電ケーブルＣｃを介して充電器２の正極端子Ｔｃ＋に電気的に接続されるとともに、電池Ｂ２の負極端子がスイッチＳＷ３、充電プラグＰｃ、及び充電ケーブルＣｃを介して充電器２の負極端子Ｔｃ−に電気的に接続される。   Then, the positive terminal of the battery B1 is electrically connected to the positive terminal Tc + of the charger 2 through the charging plug Pc and the charging cable Cc, and the negative terminal of the battery B2 is connected to the switch SW3, the charging plug Pc, and the charging cable. It is electrically connected to the negative terminal Tc− of the charger 2 via Cc.

このように、充電プラグＰｃが電池パック１に接続された状態でスイッチＳＷ１、ＳＷ２が遮断するとともに、スイッチＳＷ３が導通すると、充電器２から直列接続された電池Ｂ１、Ｂ２への電力を供給することが可能な状態になる。そして、充電器２から電池Ｂ１、Ｂ２へ電力が供給されると、充電器２の正極端子Ｔｃ＋から電池Ｂ１、ダイオードＤ、電池Ｂ２、及びスイッチＳＷ３を介して充電器２の負極端子Ｔｃ−へ電流が流れる。   As described above, when the switches SW1 and SW2 are cut off while the charging plug Pc is connected to the battery pack 1, and the switch SW3 is turned on, power is supplied from the charger 2 to the batteries B1 and B2 connected in series. It becomes possible. When power is supplied from the charger 2 to the batteries B1 and B2, the positive terminal Tc + of the charger 2 is connected to the negative terminal Tc− of the charger 2 through the battery B1, the diode D, the battery B2, and the switch SW3. Current flows.

図１に示す電池パック１では、電池Ｂ１と電池Ｂ２との間にスイッチではなくダイオードＤが接続されるため、電池Ｂ１と電池Ｂ２との間に接続されるスイッチが誤動作するということがなく、スイッチの誤動作による電池Ｂ１の正極端子と負極端子の短絡や電池Ｂ２の正極端子と負極端子の短絡を防止することができる。また、ダイオードＤのアノードが電池Ｂ１の負極端子に接続され、ダイオードＤのカソードが電池Ｂ２の正極端子に接続されるため、電池パック１にジャンパプラグＰｊや充電プラグＰｃが接続されていない状態（並列接続時でも直列接続時でもないのでスイッチＳＷ１とＳＷ２が遮断状態）において、電池パック側端子Ｔｂ２と電池パック側端子Ｔｂ３とが互いに電気的に接続されても、電池パック側端子Ｔｂ２と電池パック側端子Ｔｂ３との間に電流が流れることを防止することができる。   In the battery pack 1 shown in FIG. 1, since the diode D is connected between the battery B1 and the battery B2, not the switch, the switch connected between the battery B1 and the battery B2 does not malfunction. It is possible to prevent a short circuit between the positive terminal and the negative terminal of the battery B1 and a short circuit between the positive terminal and the negative terminal of the battery B2 due to a malfunction of the switch. Further, since the anode of the diode D is connected to the negative terminal of the battery B1, and the cathode of the diode D is connected to the positive terminal of the battery B2, the jumper plug Pj and the charging plug Pc are not connected to the battery pack 1 ( Even when the battery pack side terminal Tb2 and the battery pack side terminal Tb3 are electrically connected to each other in the case where the switches SW1 and SW2 are in the cut-off state because they are not in parallel connection or series connection, the battery pack side terminal Tb2 and the battery pack It is possible to prevent a current from flowing between the side terminal Tb3.

また、図１に示す電池パック１では、電池Ｂ１の負極端子が負荷Ｌｏの負極端子Ｔｌ−に直接接続され、電池Ｂ２の負極端子がスイッチＳＷ２を介して負荷Ｌｏの負極端子Ｔｌ−に接続されるため、電池Ｂ１、Ｂ２の充電が終了した直後にジャンパプラグＰｊが電池パック１に接続されたとしても、充電終了直後にまだ残っている電池Ｂ１、Ｂ２全体の電圧ではなく、充電終了直後にまだ残っている電池Ｂ１の電圧分だけが負荷Ｌｏにかかるようにすることができる。   In the battery pack 1 shown in FIG. 1, the negative terminal of the battery B1 is directly connected to the negative terminal Tl− of the load Lo, and the negative terminal of the battery B2 is connected to the negative terminal Tl− of the load Lo via the switch SW2. Therefore, even if the jumper plug Pj is connected to the battery pack 1 immediately after the charging of the batteries B1 and B2, the voltage of the batteries B1 and B2 still remaining immediately after the charging is not completed, but immediately after the charging is completed. Only the voltage of the remaining battery B1 can be applied to the load Lo.

また、図１に示す電池パック１では、電池パック側端子Ｔｂ３と電池Ｂ２の負極端子との間にスイッチＳＷ３が接続されるため、電池Ｂ１、Ｂ２の充電時に充電器２が故障するなどして充電器２から電池パック１へ過電流が流れそうになっても、スイッチＳＷ３を遮断することで、電池Ｂ１、Ｂ２に過電流が流れることを防止することができる。   Further, in the battery pack 1 shown in FIG. 1, since the switch SW3 is connected between the battery pack side terminal Tb3 and the negative terminal of the battery B2, the charger 2 breaks down when the batteries B1 and B2 are charged. Even if an overcurrent is likely to flow from the charger 2 to the battery pack 1, the overcurrent can be prevented from flowing to the batteries B1 and B2 by cutting off the switch SW3.

本発明は、以上の実施の形態に限定されるものでなく、本発明の要旨を逸脱しない範囲内で種々の改良、変更が可能である。
＜変形例１＞
図３は、図１に示す電池パック１の変形例１を示す図である。 The present invention is not limited to the above embodiments, and various improvements and modifications can be made without departing from the scope of the present invention.
<Modification 1>
FIG. 3 is a diagram showing a first modification of the battery pack 1 shown in FIG.

図３に示す電池パック１において、図１に示す電池パック１と異なる点は、電池Ｂ１の負極端子とダイオードＤのアノードとの接続点が抵抗Ｒを介して負荷Ｌｏの負極端子Ｔｌ−とスイッチＳＷ２の一端との接続点に接続される点である。言い換えると、抵抗Ｒの一端は電池Ｂ１の負極端子とダイオードＤのアノードとの接続点に接続され、他端は負荷Ｌｏの負極端子Ｔｌ−とスイッチＳＷ２の一端との接続点に接続される。   The battery pack 1 shown in FIG. 3 is different from the battery pack 1 shown in FIG. 1 in that the connection point between the negative terminal of the battery B1 and the anode of the diode D is connected to the negative terminal Tl− of the load Lo via the resistor R and the switch. It is a point connected to a connection point with one end of SW2. In other words, one end of the resistor R is connected to a connection point between the negative terminal of the battery B1 and the anode of the diode D, and the other end is connected to a connection point between the negative terminal Tl− of the load Lo and one end of the switch SW2.

図３に示す電池パック１では、並列接続された電池Ｂ１、Ｂ２から負荷Ｌｏへ電力が供給される際、電池Ｂ１の正極端子からジャンパ線Ｌｊ、負荷Ｌｏ、及び抵抗Ｒを介して電池Ｂ１の負極端子へ電流が流れるとともに、電池Ｂ２の正極端子からスイッチＳＷ１、ジャンパ線Ｌｊ、負荷Ｌｏ、及びスイッチＳＷ２を介して電池Ｂ２の負極端子へ電流が流れる。   In the battery pack 1 shown in FIG. 3, when power is supplied from the batteries B <b> 1 and B <b> 2 connected in parallel to the load Lo, the battery B <b> 1 is connected from the positive terminal of the battery B <b> 1 via the jumper line Lj, the load Lo, and the resistor R. While current flows to the negative terminal, current flows from the positive terminal of the battery B2 to the negative terminal of the battery B2 via the switch SW1, the jumper line Lj, the load Lo, and the switch SW2.

このように構成される図３に示す電池パック１において、例えば、抵抗Ｒの抵抗値を、スイッチＳＷ１の抵抗成分とスイッチＳＷ２の抵抗成分との合計と同じ値にすることで、電池Ｂ１、Ｂ２の並列接続時に、電池Ｂ１から負荷Ｌｏへ流れる電流を、電池Ｂ２から負荷Ｌｏへ流れる電流と同じ値または略同じ値になるように調整することができる。   In the battery pack 1 shown in FIG. 3 configured as described above, for example, by setting the resistance value of the resistor R to the same value as the sum of the resistance component of the switch SW1 and the resistance component of the switch SW2, the batteries B1, B2 Can be adjusted so that the current flowing from the battery B1 to the load Lo becomes the same value or substantially the same value as the current flowing from the battery B2 to the load Lo.

また、図３に示す電池パック１においても、図１に示す電池パック１により得られる上記効果と同様の効果を得ることができる。
＜変形例２＞
図４は、図１に示す電池パック１の変形例２を示す図である。 Also in the battery pack 1 shown in FIG. 3, the same effects as those obtained by the battery pack 1 shown in FIG. 1 can be obtained.
<Modification 2>
FIG. 4 is a diagram showing a second modification of the battery pack 1 shown in FIG.

図４に示す電池パック１において、図１に示す電池パック１と異なる点は、電池Ｂ１の正極端子が抵抗Ｒを介して負荷Ｌｏの正極端子Ｔｌ＋（電池パック側端子Ｔｂ２）とスイッチＳＷ１の一端との接続点に接続される点である。言い換えると、抵抗Ｒの一端は電池Ｂ１の正極端子に接続され、他端は負荷Ｌｏの正極端子Ｔｌ＋（電池パック側端子Ｔｂ２）とスイッチＳＷ１の一端との接続点に接続される。   The battery pack 1 shown in FIG. 4 is different from the battery pack 1 shown in FIG. 1 in that the positive terminal of the battery B1 is connected to the positive terminal Tl + (battery pack side terminal Tb2) of the load Lo via the resistor R and one end of the switch SW1. It is a point connected to the connection point. In other words, one end of the resistor R is connected to the positive terminal of the battery B1, and the other end is connected to a connection point between the positive terminal Tl + (battery pack side terminal Tb2) of the load Lo and one end of the switch SW1.

図４に示す電池パック１では、並列接続された電池Ｂ１、Ｂ２から負荷Ｌｏへ電力が供給される際、電池Ｂ１の正極端子から抵抗Ｒ、ジャンパ線Ｌｊ、及び負荷Ｌｏを介して電池Ｂ１の負極端子へ電流が流れるとともに、電池Ｂ２の正極端子からスイッチＳＷ１、ジャンパ線Ｌｊ、負荷Ｌｏ、及びスイッチＳＷ２を介して電池Ｂ２の負極端子へ電流が流れる。   In the battery pack 1 shown in FIG. 4, when power is supplied from the batteries B <b> 1 and B <b> 2 connected in parallel to the load Lo, the battery B <b> 1 is connected from the positive terminal of the battery B <b> 1 via the resistor R, the jumper line Lj, and the load Lo. While current flows to the negative terminal, current flows from the positive terminal of the battery B2 to the negative terminal of the battery B2 via the switch SW1, the jumper line Lj, the load Lo, and the switch SW2.

このように構成される図４に示す電池パック１において、図３に示す電池パック１と同様に、例えば、抵抗Ｒの抵抗値を、スイッチＳＷ１の抵抗成分とスイッチＳＷ２の抵抗成分との合計と同じ値にすることで、電池Ｂ１、Ｂ２の並列接続時に、電池Ｂ１から負荷Ｌｏへ流れる電流を、電池Ｂ２から負荷Ｌｏへ流れる電流と同じ値または略同じ値になるように調整することができる。   In the battery pack 1 shown in FIG. 4 configured as described above, similarly to the battery pack 1 shown in FIG. 3, for example, the resistance value of the resistor R is set to the sum of the resistance component of the switch SW1 and the resistance component of the switch SW2. By setting the same value, when the batteries B1 and B2 are connected in parallel, the current flowing from the battery B1 to the load Lo can be adjusted to be the same value or substantially the same value as the current flowing from the battery B2 to the load Lo. .

また、図４に示す電池パック１においても、図１に示す電池パック１により得られる上記効果と同様の効果を得ることができる。
＜変形例３＞
図５は、図１に示す電池パック１の変形例３を示す図である。 Also in the battery pack 1 shown in FIG. 4, the same effects as those obtained by the battery pack 1 shown in FIG. 1 can be obtained.
<Modification 3>
FIG. 5 is a diagram showing a third modification of the battery pack 1 shown in FIG.

図５に示す電池パック１において、図１に示す電池パック１と異なる点は、電池Ｂ１の負極端子が抵抗Ｒを介して負荷Ｌｏの負極端子Ｔｌ−とダイオードＤのアノードとの接続点に接続される点である。言い換えると、抵抗Ｒの一端は電池Ｂ１の負極端子に接続され、他端は負荷Ｌｏの負極端子Ｔｌ−とダイオードＤのアノードとの接続点に接続される。   The battery pack 1 shown in FIG. 5 is different from the battery pack 1 shown in FIG. 1 in that the negative terminal of the battery B1 is connected to the connection point between the negative terminal Tl− of the load Lo and the anode of the diode D via the resistor R. It is a point to be done. In other words, one end of the resistor R is connected to the negative terminal of the battery B1, and the other end is connected to the connection point between the negative terminal Tl− of the load Lo and the anode of the diode D.

図５に示す電池パック１では、並列接続された電池Ｂ１、Ｂ２から負荷Ｌｏへ電力が供給される際、電池Ｂ１の正極端子からジャンパ線Ｌｊ、負荷Ｌｏ、及び抵抗Ｒを介して電池Ｂ１の負極端子へ電流が流れるとともに、電池Ｂ２の正極端子からスイッチＳＷ１、ジャンパ線Ｌｊ、負荷Ｌｏ、及びスイッチＳＷ２を介して電池Ｂ２の負極端子へ電流が流れる。   In the battery pack 1 shown in FIG. 5, when power is supplied from the batteries B1 and B2 connected in parallel to the load Lo, the battery B1 is connected to the battery Lo via the jumper line Lj, the load Lo, and the resistor R from the positive terminal of the battery B1. While current flows to the negative terminal, current flows from the positive terminal of the battery B2 to the negative terminal of the battery B2 via the switch SW1, the jumper line Lj, the load Lo, and the switch SW2.

このように構成される図５に示す電池パック１において、図３に示す電池パック１や図４に示す電池パック１と同様に、例えば、抵抗Ｒの抵抗値を、スイッチＳＷ１の抵抗成分とスイッチＳＷ２の抵抗成分との合計と同じ値にすることで、電池Ｂ１、Ｂ２の並列接続時に、電池Ｂ１から負荷Ｌｏへ流れる電流を、電池Ｂ２から負荷Ｌｏへ流れる電流と同じ値または略同じ値になるように調整することができる。   In the battery pack 1 shown in FIG. 5 configured as described above, as with the battery pack 1 shown in FIG. 3 and the battery pack 1 shown in FIG. By setting the same value as the sum of the resistance components of SW2, when the batteries B1 and B2 are connected in parallel, the current flowing from the battery B1 to the load Lo becomes the same value or substantially the same value as the current flowing from the battery B2 to the load Lo. Can be adjusted.

また、図５に示す電池パック１においても、図１に示す電池パック１により得られる上記効果と同様の効果を得ることができる。
＜変形例４＞
図６は、図１に示す電池パック１の変形例４を示す図である。 Also in the battery pack 1 shown in FIG. 5, the same effects as those obtained by the battery pack 1 shown in FIG. 1 can be obtained.
<Modification 4>
FIG. 6 is a diagram showing a fourth modification of the battery pack 1 shown in FIG.

図６に示す電池パック１において、図１に示す電池パック１と異なる点は、電池Ｂ１の正極端子と負極端子を反対にし、電池Ｂ２の正極端子と負極端子を反対にし、ダイオードＤのカソードとアノードを反対にしている点である。   The battery pack 1 shown in FIG. 6 differs from the battery pack 1 shown in FIG. 1 in that the positive terminal and the negative terminal of the battery B1 are reversed, the positive terminal and the negative terminal of the battery B2 are reversed, and the cathode of the diode D The anode is reversed.

すなわち、スイッチＳＷ１（第１のスイッチ）は、一端が電池Ｂ１（第１の電池）の負極端子（一端）に接続され、他端が電池Ｂ２（第２の電池）の負極端子（一端）に接続される。また、スイッチＳＷ２（第２のスイッチ）は、一端が電池Ｂ１の正極端子（他端）に接続され、他端が電池Ｂ２の正極端子（他端）に接続される。   That is, the switch SW1 (first switch) has one end connected to the negative terminal (one end) of the battery B1 (first battery) and the other end connected to the negative terminal (one end) of the battery B2 (second battery). Connected. The switch SW2 (second switch) has one end connected to the positive terminal (the other end) of the battery B1 and the other end connected to the positive terminal (the other end) of the battery B2.

また、ダイオードＤは、カソードが電池Ｂ１の正極端子とスイッチＳＷ２の一端に接続され、アノードが電池Ｂ２の負極端子とスイッチＳＷ１の他端に接続される。
また、電池パック側端子Ｔｂ１は、負荷Ｌｏの負極端子Ｔｌ−（一端）に接続される。 The diode D has a cathode connected to the positive terminal of the battery B1 and one end of the switch SW2, and an anode connected to the negative terminal of the battery B2 and the other end of the switch SW1.
Further, the battery pack side terminal Tb1 is connected to the negative terminal Tl− (one end) of the load Lo.

また、電池パック側端子Ｔｂ２は、電池Ｂ１の負極端子及びスイッチＳＷ１の一端に接続される。
また、電池Ｂ１の正極端子は、電池Ｂ１、Ｂ２の並列接続時及び電池Ｂ１、Ｂ２の直列接続時において、負荷Ｌｏの正極端子Ｔｌ＋（他端）に接続される。 The battery pack side terminal Tb2 is connected to the negative terminal of the battery B1 and one end of the switch SW1.
The positive terminal of the battery B1 is connected to the positive terminal Tl + (the other end) of the load Lo when the batteries B1 and B2 are connected in parallel and when the batteries B1 and B2 are connected in series.

また、充電プラグ側端子Ｔｃ１は、充電器２の負極端子Ｔｃ−に接続される。
また、充電プラグ側端子Ｔｃ２は、充電器２の正極端子Ｔｃ＋に接続される。
このように構成される図６に示す電池パック１においても、図１に示す電池パック１により得られる上記効果と同様の効果を得ることができる。
＜変形例５＞
図７は、図３に示す電池パック１の変形例５を示す図である。 The charging plug side terminal Tc1 is connected to the negative terminal Tc− of the charger 2.
The charging plug side terminal Tc2 is connected to the positive terminal Tc + of the charger 2.
In the battery pack 1 shown in FIG. 6 configured as described above, the same effects as those obtained by the battery pack 1 shown in FIG. 1 can be obtained.
<Modification 5>
FIG. 7 is a diagram showing a fifth modification of the battery pack 1 shown in FIG.

図７に示す電池パック１において、図３に示す電池パック１と異なる点は、電池Ｂ１の正極端子と負極端子とを反対にし、電池Ｂ２の正極端子と負極端子とを反対にし、ダイオードＤのアノードとカソードとを反対にしている点である。   The battery pack 1 shown in FIG. 7 is different from the battery pack 1 shown in FIG. 3 in that the positive terminal and the negative terminal of the battery B1 are reversed, the positive terminal and the negative terminal of the battery B2 are reversed, and the diode D The anode and cathode are reversed.

すなわち、スイッチＳＷ１（第１のスイッチ）は、一端が電池Ｂ１（第１の電池）の負極端子（一端）に接続され、他端が電池Ｂ２（第２の電池）の負極端子（一端）に接続される。また、スイッチＳＷ２（第２のスイッチ）は、一端が抵抗Ｒを介して電池Ｂ１の正極端子（他端）に接続され、他端が電池Ｂ２の正極端子（他端）に接続される。言い換えると、電池Ｂ１の正極端子とダイオードＤのカソードとの接続点が抵抗Ｒを介して負荷Ｌｏの正極端子Ｔｃ＋（他端）とスイッチＳＷ２の一端との接続点に接続される。さらに言い換えると、電池Ｂ１の正極端子は、電池Ｂ１、Ｂ２の並列接続時及び電池Ｂ１、Ｂ２の直列接続時において、抵抗Ｒを介して、負荷Ｌｏの正極端子Ｔｌ＋（他端）に接続される。   That is, the switch SW1 (first switch) has one end connected to the negative terminal (one end) of the battery B1 (first battery) and the other end connected to the negative terminal (one end) of the battery B2 (second battery). Connected. The switch SW2 (second switch) has one end connected to the positive terminal (the other end) of the battery B1 via the resistor R, and the other end connected to the positive terminal (the other end) of the battery B2. In other words, the connection point between the positive terminal of the battery B1 and the cathode of the diode D is connected via the resistor R to the connection point between the positive terminal Tc + (the other end) of the load Lo and one end of the switch SW2. In other words, the positive terminal of the battery B1 is connected to the positive terminal Tl + (the other end) of the load Lo via the resistor R when the batteries B1 and B2 are connected in parallel and when the batteries B1 and B2 are connected in series. .

また、ダイオードＤは、カソードが電池Ｂ１の正極端子と抵抗Ｒの一端に接続され、アノードが電池Ｂ２の負極端子とスイッチＳＷ１の他端に接続される。
また、電池パック側端子Ｔｂ１は、負荷Ｌｏの負極端子Ｔｌ−（一端）に接続される。 The diode D has a cathode connected to the positive terminal of the battery B1 and one end of the resistor R, and an anode connected to the negative terminal of the battery B2 and the other end of the switch SW1.
Further, the battery pack side terminal Tb1 is connected to the negative terminal Tl− (one end) of the load Lo.

また、電池パック側端子Ｔｂ２は、電池Ｂ１の負極端子及びスイッチＳＷ１の一端に接続される。
また、充電プラグ側端子Ｔｃ１は、充電器２の負極端子Ｔｃ−に接続される。 The battery pack side terminal Tb2 is connected to the negative terminal of the battery B1 and one end of the switch SW1.
The charging plug side terminal Tc1 is connected to the negative terminal Tc− of the charger 2.

また、充電プラグ側端子Ｔｃ２は、充電器２の正極端子Ｔｃ＋に接続される。
このように構成される図７に示す電池パック１においても、図１に示す電池パック１により得られる上記効果や図３に示す電池パック１により得られる上記効果と同様の効果を得ることができる。
＜変形例６＞
図８は、図４に示す電池パック１の変形例６を示す図である。 The charging plug side terminal Tc2 is connected to the positive terminal Tc + of the charger 2.
In the battery pack 1 shown in FIG. 7 configured as described above, the same effects as those obtained by the battery pack 1 shown in FIG. 1 and the effects obtained by the battery pack 1 shown in FIG. 3 can be obtained. .
<Modification 6>
FIG. 8 is a diagram illustrating a sixth modification of the battery pack 1 illustrated in FIG. 4.

図８に示す電池パック１において、図４に示す電池パック１と異なる点は、電池Ｂ１の正極端子と負極端子とを反対にし、電池Ｂ２の正極端子と負極端子を反対にし、ダイオードＤのアノードとカソードとを反対にしている点である。   The battery pack 1 shown in FIG. 8 differs from the battery pack 1 shown in FIG. 4 in that the positive terminal and the negative terminal of the battery B1 are reversed, the positive terminal and the negative terminal of the battery B2 are reversed, and the anode of the diode D And the cathode is the opposite.

すなわち、スイッチＳＷ１（第１のスイッチ）は、一端が抵抗Ｒを介して電池Ｂ１（第１の電池）の負極端子（一端）に接続され、他端が電池Ｂ２（第２の電池）の負極端子（一端）に接続される。また、スイッチＳＷ２（第２のスイッチ）は、一端が電池Ｂ１の正極端子（他端）に接続され、他端が電池Ｂ２の正極端子（他端）に接続される。言い換えると、電池Ｂ１の負極端子が抵抗Ｒを介して負荷Ｌｏの負極端子Ｔｌ−（一端）とスイッチＳＷ１の一端との接続点に接続される。   That is, one end of the switch SW1 (first switch) is connected to the negative terminal (one end) of the battery B1 (first battery) via the resistor R, and the other end is the negative electrode of the battery B2 (second battery). Connected to terminal (one end). The switch SW2 (second switch) has one end connected to the positive terminal (the other end) of the battery B1 and the other end connected to the positive terminal (the other end) of the battery B2. In other words, the negative terminal of the battery B1 is connected via the resistor R to the connection point between the negative terminal Tl− (one end) of the load Lo and one end of the switch SW1.

また、ダイオードＤは、カソードが電池Ｂ１の正極端子とスイッチＳＷ２の一端に接続され、アノードが電池Ｂ２の負極端子とスイッチＳＷ１の他端に接続される。
また、電池パック側端子Ｔｂ１は、負荷Ｌｏの負極端子Ｔｌ−に接続される。 The diode D has a cathode connected to the positive terminal of the battery B1 and one end of the switch SW2, and an anode connected to the negative terminal of the battery B2 and the other end of the switch SW1.
The battery pack side terminal Tb1 is connected to the negative terminal Tl− of the load Lo.

また、電池パック側端子Ｔｂ２は、抵抗Ｒの他端及びスイッチＳＷ１の一端に接続される。
また、電池Ｂ１の正極端子は、電池Ｂ１、Ｂ２の並列接続時及び電池Ｂ１、Ｂ２の直列接続時において、負荷Ｌｏの正極端子Ｔｌ＋（他端）に接続される。 The battery pack side terminal Tb2 is connected to the other end of the resistor R and one end of the switch SW1.
The positive terminal of the battery B1 is connected to the positive terminal Tl + (the other end) of the load Lo when the batteries B1 and B2 are connected in parallel and when the batteries B1 and B2 are connected in series.

また、充電プラグ側端子Ｔｃ１は、充電器２の負極端子Ｔｃ−に接続される。
また、充電プラグ側端子Ｔｃ２は、充電器２の正極端子Ｔｃ＋に接続される。
このように構成される図８に示す電池パック１においても、図１に示す電池パック１により得られる上記効果や図４に示す電池パック１により得られる上記効果と同様の効果を得ることができる。
＜変形例７＞
図９は、図５に示す電池パック１の変形例７を示す図である。 The charging plug side terminal Tc1 is connected to the negative terminal Tc− of the charger 2.
The charging plug side terminal Tc2 is connected to the positive terminal Tc + of the charger 2.
In the battery pack 1 shown in FIG. 8 configured as described above, the same effects as those obtained by the battery pack 1 shown in FIG. 1 and the effects obtained by the battery pack 1 shown in FIG. 4 can be obtained. .
<Modification 7>
FIG. 9 is a diagram showing a modification 7 of the battery pack 1 shown in FIG.

図９に示す電池パック１において、図５に示す電池パック１と異なる点は、電池Ｂ１の正極端子と負極端子とを反対にし、電池Ｂ２の正極端子と負極端子とを反対にし、ダイオードＤのアノードとカソードとを反対にしている点である。   The battery pack 1 shown in FIG. 9 is different from the battery pack 1 shown in FIG. 5 in that the positive terminal and the negative terminal of the battery B1 are reversed, the positive terminal and the negative terminal of the battery B2 are reversed, and the diode D The anode and cathode are reversed.

すなわち、スイッチＳＷ１（第１のスイッチ）は、一端が電池Ｂ１（第１の電池）の負極端子（一端）に接続され、他端が電池Ｂ２（第２の電池）の負極端子（一端）に接続される。また、スイッチＳＷ２（第２のスイッチ）は、一端が抵抗Ｒを介して電池Ｂ１の正極端子（他端）に接続され、他端が電池Ｂ２の正極端子（他端）に接続される。言い換えると、電池Ｂ１の正極端子が抵抗Ｒを介して負荷Ｌｏの正極端子Ｔｌ＋（他端）とダイオードＤのカソードとの接続点に接続される。さらに言い換えると、電池Ｂ１の正極端子は、電池Ｂ１、Ｂ２の並列接続時及び電池Ｂ１、Ｂ２の直列接続時において、抵抗Ｒを介して、負荷Ｌｏの正極端子Ｔｌ＋（他端）に接続される。   That is, the switch SW1 (first switch) has one end connected to the negative terminal (one end) of the battery B1 (first battery) and the other end connected to the negative terminal (one end) of the battery B2 (second battery). Connected. The switch SW2 (second switch) has one end connected to the positive terminal (the other end) of the battery B1 via the resistor R, and the other end connected to the positive terminal (the other end) of the battery B2. In other words, the positive terminal of the battery B1 is connected to the connection point between the positive terminal Tl + (the other end) of the load Lo and the cathode of the diode D via the resistor R. In other words, the positive terminal of the battery B1 is connected to the positive terminal Tl + (the other end) of the load Lo via the resistor R when the batteries B1 and B2 are connected in parallel and when the batteries B1 and B2 are connected in series. .

また、ダイオードＤは、カソードが抵抗Ｒの他端とスイッチＳＷ２の一端に接続され、アノードが電池Ｂ２の負極端子とスイッチＳＷ１の他端に接続される。
また、電池パック側端子Ｔｂ１は、負荷Ｌｏの負極端子Ｔｌ−（一端）に接続される。 The diode D has a cathode connected to the other end of the resistor R and one end of the switch SW2, and an anode connected to the negative terminal of the battery B2 and the other end of the switch SW1.
Further, the battery pack side terminal Tb1 is connected to the negative terminal Tl− (one end) of the load Lo.

また、電池パック側端子Ｔｂ２は、電池Ｂ１の負極端子及びスイッチＳＷ１の一端に接続される。
また、充電プラグ側端子Ｔｃ１は、充電器２の負極端子Ｔｃ−に接続される。 The battery pack side terminal Tb2 is connected to the negative terminal of the battery B1 and one end of the switch SW1.
The charging plug side terminal Tc1 is connected to the negative terminal Tc− of the charger 2.

また、充電プラグ側端子Ｔｃ２は、充電器２の正極端子Ｔｃ＋に接続される。
このように構成される図９に示す電池パック１においても、図１に示す電池パック１により得られる上記効果や図５に示す電池パック１により得られる上記効果と同様の効果を得ることができる。 The charging plug side terminal Tc2 is connected to the positive terminal Tc + of the charger 2.
In the battery pack 1 shown in FIG. 9 configured as described above, the same effects as those obtained by the battery pack 1 shown in FIG. 1 and the effects obtained by the battery pack 1 shown in FIG. 5 can be obtained. .

１ 電池パック
１１ 制御部
２ 充電器
Ｂ１、Ｂ２ 電池
ＳＷ１〜ＳＷ３ スイッチ
Ｄ ダイオード
Ｐｊ ジャンパプラグ
Ｌｊ ジャンパ線
Ｐｃ 充電プラグ
Ｌｏ 負荷
DESCRIPTION OF SYMBOLS 1 Battery pack 11 Control part 2 Charger B1, B2 Battery SW1-SW3 Switch D Diode Pj Jumper plug Lj Jumper line Pc Charge plug Lo Load

Claims (6)

第１の電池と、第２の電池とを備える電池パックであって、
前記第１及び第２の電池の並列接続時に一端が負荷の一端に接続され、前記第１及び第２の電池の並列接続時並びに前記第１及び第２の電池の直列接続時に他端が前記負荷の他端と接続される前記第１の電池と、
一端が前記第１の電池の一端に接続され、他端が前記第２の電池の一端に接続される第１のスイッチと、
一端が前記第１の電池の他端に接続され、他端が前記第２の電池の他端に接続される第２のスイッチと、
前記第１及び第２の電池の並列接続時、前記第１及び第２のスイッチを導通させ、前記第１及び第２の電池の直列接続時、前記第１及び第２のスイッチを遮断させる制御部と、
前記第１の電池の他端と前記第２の電池の一端との間に接続されるダイオードと、
を備えることを特徴とする電池パック。 A battery pack comprising a first battery and a second battery,
One end is connected to one end of a load when the first and second batteries are connected in parallel, and the other end is connected when the first and second batteries are connected in parallel and when the first and second batteries are connected in series. The first battery connected to the other end of the load;
A first switch having one end connected to one end of the first battery and the other end connected to one end of the second battery;
A second switch having one end connected to the other end of the first battery and the other end connected to the other end of the second battery;
Control that turns on the first and second switches when the first and second batteries are connected in parallel, and turns off the first and second switches when the first and second batteries are connected in series. And
A diode connected between the other end of the first battery and one end of the second battery;
A battery pack comprising: 請求項１に記載の電池パックであって、
一端が充電器に接続され、他端が前記第２の電池の他端と前記第２のスイッチの他端との接続点に接続される第３のスイッチを備え、
前記制御部は、前記第１及び第２の電池の並列接続時、前記第３のスイッチを遮断させ、前記第１及び第２の電池の直列接続時、前記第３のスイッチを導通させる
ことを特徴とする電池パック。 The battery pack according to claim 1,
A third switch having one end connected to the charger and the other end connected to a connection point between the other end of the second battery and the other end of the second switch;
The control unit shuts off the third switch when the first and second batteries are connected in parallel, and turns on the third switch when the first and second batteries are connected in series. Battery pack featuring. 請求項１または請求項２に記載の電池パックであって、
前記第１の電池の他端と前記ダイオードとの接続点が抵抗を介して前記負荷の他端と前記第２のスイッチの一端との接続点に接続される
ことを特徴とする電池パック。 The battery pack according to claim 1 or 2,
The battery pack, wherein a connection point between the other end of the first battery and the diode is connected to a connection point between the other end of the load and one end of the second switch via a resistor. 請求項１または請求項２に記載の電池パックであって、
前記第１の電池の一端が抵抗を介して前記負荷の一端と前記第１のスイッチの一端との接続点に接続される
ことを特徴とする電池パック。 The battery pack according to claim 1 or 2,
One end of the first battery is connected to a connection point between one end of the load and one end of the first switch through a resistor. 請求項１または請求項２に記載の電池パックであって、
前記第１の電池の他端が抵抗を介して前記負荷の他端と前記ダイオードとの接続点に接続される
ことを特徴とする電池パック。 The battery pack according to claim 1 or 2,
The battery pack, wherein the other end of the first battery is connected to a connection point between the other end of the load and the diode via a resistor. 請求項３〜５の何れか一項に記載の電池パックであって、
前記抵抗の抵抗値は、前記第１のスイッチの抵抗成分と前記第２のスイッチの抵抗成分との合計と同じ値である
ことを特徴とする電池パック。
The battery pack according to any one of claims 3 to 5,
The battery pack, wherein the resistance value of the resistor is the same as the sum of the resistance component of the first switch and the resistance component of the second switch.
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5212915U (en) * 1975-07-16 1977-01-29
JPH01110027A (en) * 1987-10-21 1989-04-26 Nec Corp Back-up power device
US5734205A (en) * 1996-04-04 1998-03-31 Jeol Ltd. Power supply using batteries undergoing great voltage variations
JP2002142375A (en) * 2000-10-30 2002-05-17 Nippon Telegr & Teleph Corp <Ntt> Power storage system and control method therefor
JP2003047236A (en) * 2001-08-02 2003-02-14 Sony Corp Power supply apparatus and power supply method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5212915U (en) * 1975-07-16 1977-01-29
JPH01110027A (en) * 1987-10-21 1989-04-26 Nec Corp Back-up power device
US5734205A (en) * 1996-04-04 1998-03-31 Jeol Ltd. Power supply using batteries undergoing great voltage variations
JP2002142375A (en) * 2000-10-30 2002-05-17 Nippon Telegr & Teleph Corp <Ntt> Power storage system and control method therefor
JP2003047236A (en) * 2001-08-02 2003-02-14 Sony Corp Power supply apparatus and power supply method

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