JPH03295158A - Battery pack - Google Patents
Battery packInfo
- Publication number
- JPH03295158A JPH03295158A JP2096427A JP9642790A JPH03295158A JP H03295158 A JPH03295158 A JP H03295158A JP 2096427 A JP2096427 A JP 2096427A JP 9642790 A JP9642790 A JP 9642790A JP H03295158 A JPH03295158 A JP H03295158A
- Authority
- JP
- Japan
- Prior art keywords
- battery
- batteries
- switching means
- voltage
- connection switching
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 238000004880 explosion Methods 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000009172 bursting Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、電池で動作する電子機器に内蔵する電池パッ
クに関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a battery pack built into an electronic device operated by a battery.
一般に、電池パックは負荷側に対して、電池を複数個直
列に接続して所定の電圧として使用する場合や、その複
数個を並列に接続して、大容量電池として用いる場合が
多い。Generally, in a battery pack, a plurality of batteries are often connected in series to provide a predetermined voltage for the load side, or a plurality of batteries are often connected in parallel to be used as a large-capacity battery.
従来の電池パックは、特開昭６２−１８６４６２号公報
に記載のように、複数の電池を−通りの接続方法で接続
し−通りの電圧しか出力していなかった。As described in Japanese Patent Laid-Open No. 62-186462, conventional battery packs connect a plurality of batteries in different ways and output only different voltages.
第２図、第３図は従来の電池パックを示した図である。FIGS. 2 and 3 are diagrams showing conventional battery packs.
第２図において、各電池２を固定する電池ホルダｌの中
で各電池２は隣り合う電池の正極と負極が、直接、接触
し、両端の電池の正極５１と負極５−２から電極をとる
形の直列接続を行なった電池パックである。この時の正
極５−１゜負極５−２間の電圧は、（一つの電池２の電
圧（Ｖ） ） Ｘ （電池２の個数）■となる。第３図
において、各電池２を固定する電池ホルダｌの中で各電
池２は、正極通し、負極通しを接続し、正極５−１．負
極５−２から電極をとる形の並列接続を行なった電池パ
ックである。この時の電圧は一つの電池２に電圧に等し
いが、最大電流量は電池２の個数値に増えるため、大電
流が必要となるシステムに用いられる。他に必要とする
電圧を得るため数個直列に接続した電池パックを複数用
い、並列に接続することにより大電流を得るようにした
、１２図、第３図の構成電池バックを組合せたタイプの
電池パックがある。In FIG. 2, the positive and negative electrodes of each battery 2 are in direct contact with each other in the battery holder l that fixes each battery 2, and electrodes are taken from the positive electrode 51 and negative electrode 5-2 of the batteries at both ends. This is a battery pack that is connected in series. At this time, the voltage between the positive electrode 5-1 and the negative electrode 5-2 is (voltage (V) of one battery 2) x (number of batteries 2) (2). In FIG. 3, each battery 2 is connected to a positive electrode passage, a negative electrode passage, and a positive electrode 5-1. This is a battery pack in which the electrode is connected in parallel with the negative electrode 5-2. The voltage at this time is equal to the voltage of one battery 2, but the maximum current amount increases depending on the number of batteries 2, so it is used in a system that requires a large current. In addition, in order to obtain the required voltage, several battery packs are connected in series, and by connecting them in parallel, a large current is obtained. A type that combines the battery packs shown in Figures 12 and 3. There is a battery pack.
上記従来技術は、電池パックの汎用性について考慮がさ
れておらず、負荷が変わる度、負荷の必要とする電圧に
合わせて電池パックを再構成しなければならなかった。The above conventional technology does not consider the versatility of the battery pack, and each time the load changes, the battery pack must be reconfigured to match the voltage required by the load.
さらに、上記従来技術は、充電時の安全性についても考
慮がされておらず、各二次電池が並列接続されている電
池パックにおいて、充電時に各二次電池の内部電気抵抗
の違いにより、各二次電池に流れる電流が異なり、内部
電気抵抗の小さい電池に大電流が流れ故障、あるいは、
破裂する危険性があった。Furthermore, the above-mentioned conventional technology does not consider safety during charging, and in a battery pack in which each secondary battery is connected in parallel, due to the difference in internal electrical resistance of each secondary battery during charging, each The current flowing through the secondary batteries is different, and a large current flows to the battery with a lower internal electrical resistance, resulting in a malfunction.
There was a risk of it bursting.
本発明の目的は、各電池の接続方法を切り替えることに
より、負荷の変化に応じて負荷の必要とする電圧を出力
することにある。An object of the present invention is to output the voltage required by the load according to changes in the load by switching the connection method of each battery.
本発明の他の目的は、電池パックの充電時に充電装置の
機能と安全性を考慮し、各電池に流れる電流が一定にな
るように、電池の接続方法を切り替え、充電時の電池の
不具合を防止することにある。Another object of the present invention is to take into consideration the function and safety of the charging device when charging the battery pack, change the battery connection method so that the current flowing through each battery is constant, and prevent battery malfunctions during charging. The purpose is to prevent it.
本発明の他の目的は、電池パック内の各電池の切り替え
手段として電気的に制御可能な切り替え手段を用い、計
算機等による制御を可能にすることにある。Another object of the present invention is to use electrically controllable switching means as switching means for each battery in a battery pack, and to enable control by a computer or the like.
本発明の目的は、電池パックの機能を市販の電池を用い
て得られるような電池ボックスを提供することにある。An object of the present invention is to provide a battery box that can provide the functions of a battery pack using commercially available batteries.
上記目的を達成するために、各電池の正極、負極を直に
接触させ接続させることを止め、各電池の正極、負極か
らの引き出し線を設け、各電池の接続を任意に切り替え
る手段を設ける。また、充電時に電池接続を切り替える
充電スイッチを設ける。また、切り替え手段に電気的に
制御可能な機能を付加する。また、市販電池を用いるこ
とを可能にするため、電池交換可能な電池ボックスを用
い、引き出し線、及び電池接続切り替え手段を設ける。In order to achieve the above object, the positive and negative electrodes of each battery are no longer connected by direct contact, and lead wires are provided from the positive and negative electrodes of each battery, and a means is provided for arbitrarily switching the connection of each battery. Additionally, a charging switch is provided to switch battery connection during charging. Further, an electrically controllable function is added to the switching means. Furthermore, in order to make it possible to use commercially available batteries, a replaceable battery box is used, and lead wires and battery connection switching means are provided.
各電池の正極、負極からの引き出し線は、個々の電池の
電圧を他の電池の影響を受けることなく切り替える。ま
た、電池接続の切り替え手段は、引き出し線の接続を任
意に切り替え、並列、直列、並列直列混合の接続を行な
えるようにし、出力電圧を選択して得られるようにする
。The lead wires from the positive and negative electrodes of each battery switch the voltage of each battery without being affected by other batteries. Further, the battery connection switching means arbitrarily switches the connection of the lead wires so that parallel, series, and parallel-series mixed connections can be performed, and the output voltage can be selected and obtained.
充電スイッチは電池接続切り替え手段に対し、電池の破
裂等の事故を防ぐために強制的に電池の接続方法を指定
する。The charging switch forcibly specifies the battery connection method to the battery connection switching means in order to prevent accidents such as battery explosion.
電池ボックスは、電池パック内の電池を取りはずし可能
にすることにより、市販の電池を使用可能にする。The battery box allows the use of commercially available batteries by making the batteries within the battery pack removable.
以下、本発明の一実施例を第１図を用いて説明する。電
池パック内の電池２を固定する電池ホルダ１の内部で各
電池２は互いに分離し接触しないよう保持しておく、各
電池２の正、負極から引き出し線（導電性の物質）３−
１．３−２により電池２と電池接続切り替え手段４を接
続する。電池接続切り替え手段４は各電池２の出力が短
絡しないように、手動、又は、自動で台ない、正極電極
５−１、負極電極５−２に電流を出力する。電池接続切
り替え手段４では各電池２の出力を切り替えることによ
り、正極電極５−１、負極電極５−２間の電圧を切り換
えることが可能となる。An embodiment of the present invention will be described below with reference to FIG. Inside the battery holder 1 that fixes the batteries 2 in the battery pack, the batteries 2 are kept separate from each other so as not to come into contact with each other. Lead wires (conductive material) 3- are connected to the positive and negative electrodes of each battery 2.
1. Connect the battery 2 and the battery connection switching means 4 by 3-2. The battery connection switching means 4 outputs current to the positive electrode 5-1 and the negative electrode 5-2 manually or automatically so that the output of each battery 2 is not short-circuited. By switching the output of each battery 2, the battery connection switching means 4 can switch the voltage between the positive electrode 5-1 and the negative electrode 5-2.
以下、電池接続切り替え手段４について第４図。Below, FIG. 4 shows the battery connection switching means 4.
第５図、第６図を用いて説明する。第４図は電池接続切
り替え手段４の内部の切り替えスイッチ（手動スイッチ
あるいはリレー等の電気的に切り替え可能なスイッチ）
４−１〜４−８を電池２が直列に接続されるように接続
した一実施例である。This will be explained using FIGS. 5 and 6. Figure 4 shows a switch inside the battery connection switching means 4 (a manual switch or an electrically switchable switch such as a relay).
This is an example in which batteries 4-1 to 4-8 are connected so that batteries 2 are connected in series.
この時、正極電極５−１、負極電極５−２の間には、電
池２が仮にリチウム電池とすると１２Ｖ（３ＶＸ４個）
の電圧が生じる。第５図は、電池接続切り替え手段４内
のスイッチｌ−１〜４−８を電池２が並列に接続される
ように接続した例である。At this time, if the battery 2 is a lithium battery, the voltage between the positive electrode 5-1 and the negative electrode 5-2 is 12V (3V x 4 pieces).
voltage is generated. FIG. 5 shows an example in which the switches l-1 to 4-8 in the battery connection switching means 4 are connected so that the batteries 2 are connected in parallel.
この時、正極電極５−１．負極電極５−２間には、電池
２が仮にリチウム電池とすると３■の電圧が生じる。第
６図は電池接続切り替え手段４内のスイッチ４−１〜４
−８を電池２が二個ずつ直列に接続し、さらに並列に接
続されるようにした一実施例である。この時、正極電極
５−１．負極電極５−２間には、電池２が仮にリチウム
電池とすると６Ｖ （３ＶＸ２個）の電圧が生じる。こ
のように電池接続切り替え手段４内のスイッチ４−１〜
４−８を切り替えることにより出力電圧を選択すること
が可能となり汎用性が増す。At this time, positive electrode 5-1. If the battery 2 is a lithium battery, a voltage of 3cm is generated between the negative electrode 5-2. FIG. 6 shows switches 4-1 to 4 in the battery connection switching means 4.
This is an example in which two batteries 2 are connected in series and further connected in parallel. At this time, positive electrode 5-1. If the battery 2 is a lithium battery, a voltage of 6V (3V x 2) is generated between the negative electrode 5-2. In this way, the switches 4-1 to 4 in the battery connection switching means 4
By switching 4-8, the output voltage can be selected, increasing versatility.
また、電池２に二次電池を用い第５図、第６図のように
並列、あるいは、直列並列混合で接続した電池バックに
おいて、充電時に第４図に示すような直列接続に切り替
えることにより、各電池２に流れる電流を一様にし、二
次電池の異常発熱、破裂等の事故を防止する効果がある
。In addition, in a battery bag that uses a secondary battery as the battery 2 and is connected in parallel as shown in Figs. 5 and 6, or in a series-parallel mixture, by switching to a series connection as shown in Fig. 4 at the time of charging, This has the effect of making the current flowing through each battery 2 uniform and preventing accidents such as abnormal heat generation and explosion of the secondary battery.
また、電池パックの電池ホルダ１を開閉式にし、市販電
池を用いることを可能にし、電圧切り替え可能な電池ボ
ックスを構成することにより、電池ボックスの汎用性が
増すという効果がある。Further, by making the battery holder 1 of the battery pack open and closing, making it possible to use commercially available batteries, and configuring a battery box that can switch the voltage, there is an effect that the versatility of the battery box is increased.
第７図は、電池接続切り替え手段４を電気的に切り替え
制御を可能にした電池バックの一実施例である。ＣＰＵ
６の出力する電池切り替え制御信号により、電池接続切
り替え手段４は、電池２の接続方法を切り替え、正極電
極、負極電極間の電圧を選択することが可能となる。ま
た、充電回路７が出力する充電開始信号により、電池切
り替え手段４を電池２が直列に接続されるように制御す
る。これにより電圧の自動選択及び、充電時の危険防止
を行なうという効果がある。FIG. 7 shows an embodiment of a battery bag in which the battery connection switching means 4 can be electrically switched and controlled. CPU
6 outputs a battery switching control signal, the battery connection switching means 4 can switch the connection method of the battery 2 and select the voltage between the positive electrode and the negative electrode. Further, the battery switching means 4 is controlled by the charging start signal outputted by the charging circuit 7 so that the batteries 2 are connected in series. This has the effect of automatically selecting the voltage and preventing danger during charging.
本発明の他の実施例を第６図、第８図、第９図、第１０
図、第１１図を用いて説明する。第６図は前述の実施例
のように正極５−１．負極５−２間に電池接続切り替え
手段４内のスイッチ４−１〜４−８を電池２が直列に接
続されるように設定してある。これを略図で示したもの
が第９図である。実施例では電池接続切り替え手段４内
のスイッチ４１〜４−８を電池２が直列、並列、あるい
は、直列、並列混合になるように切り替えていたが、全
電池の一部分だけを接続できるようにした例が第８図で
ある。第８図では、電池２を二本だけ使用し直列接続を
行なっている。これを略図にしたのが第１０図、第１１
図である。つまり第９図の電池バックに接続する負荷に
低消費電力モードと、通常動作モードを設ける場合、通
常動作モード時には第９図で示すように電池２を全て直
列にして接続し、低消費電力モード時には、負荷で必要
とする電圧を通常より下げることにより節電を行なうた
め第１０図、第１１図のように電池２の一部だけ使用す
ることにより実現できる。Other embodiments of the present invention are shown in FIGS. 6, 8, 9, and 10.
This will be explained using FIG. FIG. 6 shows the positive electrode 5-1. Switches 4-1 to 4-8 in the battery connection switching means 4 are set so that the batteries 2 are connected in series between the negative electrode 5-2. This is schematically shown in FIG. 9. In the embodiment, the switches 41 to 4-8 in the battery connection switching means 4 were switched so that the batteries 2 were connected in series, in parallel, or in a mixture of series and parallel, but only a portion of all the batteries could be connected. An example is shown in FIG. In FIG. 8, only two batteries 2 are used and connected in series. This is schematically illustrated in Figures 10 and 11.
It is a diagram. In other words, when providing a low power consumption mode and a normal operation mode for the load connected to the battery back shown in Fig. 9, all batteries 2 are connected in series as shown in Fig. 9 in the normal operation mode, and the low power consumption mode is set. In some cases, this can be achieved by using only a portion of the battery 2, as shown in FIGS. 10 and 11, in order to save power by lowering the voltage required by the load compared to normal.
また、第１０図で正極５−１．負極５−２間に生じる電
圧が負荷で通常動作中に必要とする電圧である場合（電
池２．二本直列した電圧）、残りの電池２．二本は予備
バッテリとして用いることが可能となる６つまり、電池
２を充電する時は、第９図のように、すべての電池２を
直列に接続し、通常動作時は第１０図又は第１１図のよ
うに電池２を半分直列に接続し、電池の容量が減少した
場合、残りの半分を直列に接続する。（第１０図と第１
１図の接続方法の切り替えを行なう。）
〔発明の効果〕
本発明は、電池接続切り替え手段により複数の出力電圧
から一種類の電圧を選択して出力することができる。ま
た、電池切り替え手段を電気的に制御可能にすることに
より、ＣＰＵ等の電子回路による制御が可能となり、出
力電圧の自動切り替えや充電時の自動接続切り替えを行
なうことができる。また、充電時に接続を切り替えるこ
とが可能なため、個々の電池に流れる電流が一様になり
、電池の異常発熱及び、破裂等の事故を防ぐことができ
る。また、電池パック内の電池ホルダを開閉式にするこ
とにより、市販の電池を使用可能にし、出力電圧の選択
が可能となる。In addition, in FIG. 10, positive electrode 5-1. If the voltage developed across the negative electrode 5-2 is the voltage required by the load during normal operation (voltage of two batteries 2. in series), the remaining battery 2. Two batteries can be used as spare batteries 6 In other words, when charging the batteries 2, connect all the batteries 2 in series as shown in Figure 9, and during normal operation, connect them in series as shown in Figure 10 or 11. As shown in the figure, half of the batteries 2 are connected in series, and when the battery capacity decreases, the remaining half is connected in series. (Figures 10 and 1
Switch the connection method shown in Figure 1. ) [Effects of the Invention] According to the present invention, one type of voltage can be selected from a plurality of output voltages and outputted by the battery connection switching means. Furthermore, by making the battery switching means electrically controllable, control by an electronic circuit such as a CPU becomes possible, and automatic switching of output voltages and automatic switching of connections during charging can be performed. Furthermore, since the connection can be switched during charging, the current flowing through each battery becomes uniform, and accidents such as abnormal heat generation and explosion of the batteries can be prevented. Furthermore, by making the battery holder in the battery pack open/closeable, commercially available batteries can be used and the output voltage can be selected.
第１図は本発明の一実施例を示したブロック図、第２図
は、従来技術により電池を直列に接続した説明図、第３
図は従来技術により電池を並列に接続した説明図、第４
図は第１図を模式化し、電池接続切り替え手段内部を直
列接続にした説明図、第５図は第１図を模式化し、電池
接続切り替え手段内部を並列接続にした説明図、第６図
は第１図を模式化し、電池接続切り替え手段内部を直列
並列混合接続した説明図、第７図は電池接続切り替え手
段を電気的に制御可能にし、ＣＰＵ等の電子回路から制
御するようにしたブロック図、第８図は全電池の一部を
接続した一実施例の説明図、第９図は第６図の、第１０
図、第１１図は第８図の説明図である。
１・・・電池ホルダ ２・・・電池３−１．３−
２・・・電極引き出し線
４・・・電池接続切り替え手段
４−１〜４−８・・・電池接続切り替え手段内スイッチ
５−１．５−２・・・（正、負極）電極６・・・ＣＰＵ
回路 ７・・・充電回路第６図
凭７図
閉６図
〒９図
ｆｆｌｌＯ図
〒
図
５”Ｚ
ン１FIG. 1 is a block diagram showing one embodiment of the present invention, FIG. 2 is an explanatory diagram of batteries connected in series according to the prior art, and FIG.
The figure is an explanatory diagram of batteries connected in parallel using conventional technology.
The figure is a schematic representation of FIG. 1, with the inside of the battery connection switching means connected in series. FIG. 5 is a diagram of FIG. 1, with the inside of the battery connection switching means connected in parallel. Fig. 1 is a schematic representation of the inside of the battery connection switching means which is connected in a mixed series/parallel manner, and Fig. 7 is a block diagram in which the battery connection switching means is electrically controllable and controlled from an electronic circuit such as a CPU. , FIG. 8 is an explanatory diagram of an embodiment in which a part of all the batteries are connected, and FIG.
11 are explanatory diagrams of FIG. 8. 1...Battery holder 2...Battery 3-1.3-
2... Electrode lead wire 4... Battery connection switching means 4-1 to 4-8... Switch in battery connection switching means 5-1.5-2... (Positive, negative electrode) Electrode 6...・CPU
Circuit 7... Charging circuit Figure 6 Figure 7 Closed Figure 6 Figure 9ffllO Figure Figure 5"Z N1
Claims (1)
池の接続を切り替えることにより数種類の電圧中、一種
類の電圧を選択して出力することを特徴とする電池パッ
ク。 ２、請求項１において、電池として充電可能な二次電池
を用い、電池使用時と充電時に電池の接続方法を切り替
える電池パック。 ３、請求項１または２において、パックの電池接続の切
り替え機構をもつ電池ボックス。[Scope of Claims] 1. A battery pack in which a plurality of batteries are combined, and is characterized in that one type of voltage is selected and outputted from among several types of voltage by switching the connection of internal batteries. 2. The battery pack according to claim 1, which uses a rechargeable secondary battery as the battery and switches the connection method of the battery between when the battery is used and when it is charged. 3. The battery box according to claim 1 or 2, having a switching mechanism for battery connection of the pack.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2096427A JPH03295158A (en) | 1990-04-13 | 1990-04-13 | Battery pack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2096427A JPH03295158A (en) | 1990-04-13 | 1990-04-13 | Battery pack |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03295158A true JPH03295158A (en) | 1991-12-26 |
Family
ID=14164695
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2096427A Pending JPH03295158A (en) | 1990-04-13 | 1990-04-13 | Battery pack |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03295158A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06150901A (en) * | 1992-11-10 | 1994-05-31 | Sony Corp | Combined secondary battery |
| JP2007257968A (en) * | 2006-03-23 | 2007-10-04 | Hitachi Ltd | Automobile-use power supply system using wound-around battery |
| JP2017208981A (en) * | 2016-05-20 | 2017-11-24 | 壮彦 北中 | Battery device and power supply system |
| WO2022070766A1 (en) * | 2020-09-30 | 2022-04-07 | 工機ホールディングス株式会社 | Electric device system and battery pack |
| US11648654B2 (en) | 2014-03-06 | 2023-05-16 | Koki Holdings Co., Ltd. | Multi-voltage battery pack for power tools |
-
1990
- 1990-04-13 JP JP2096427A patent/JPH03295158A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06150901A (en) * | 1992-11-10 | 1994-05-31 | Sony Corp | Combined secondary battery |
| JP2007257968A (en) * | 2006-03-23 | 2007-10-04 | Hitachi Ltd | Automobile-use power supply system using wound-around battery |
| US11648654B2 (en) | 2014-03-06 | 2023-05-16 | Koki Holdings Co., Ltd. | Multi-voltage battery pack for power tools |
| JP2017208981A (en) * | 2016-05-20 | 2017-11-24 | 壮彦 北中 | Battery device and power supply system |
| WO2022070766A1 (en) * | 2020-09-30 | 2022-04-07 | 工機ホールディングス株式会社 | Electric device system and battery pack |
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