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JP2010040226A - Battery pack for electric tools - Google Patents

Battery pack for electric tools Download PDF

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JP2010040226A
JP2010040226A JP2008199129A JP2008199129A JP2010040226A JP 2010040226 A JP2010040226 A JP 2010040226A JP 2008199129 A JP2008199129 A JP 2008199129A JP 2008199129 A JP2008199129 A JP 2008199129A JP 2010040226 A JP2010040226 A JP 2010040226A
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battery pack
lithium ion
ion secondary
secondary battery
battery
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JP2010040226A5 (en
Inventor
Takahisa Aradate
卓央 荒舘
Fumio Tashita
文雄 田下
Eiji Nakayama
栄二 中山
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Koki Holdings Co Ltd
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Hitachi Koki Co Ltd
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Priority to JP2008199129A priority Critical patent/JP2010040226A/en
Priority to PCT/JP2009/063897 priority patent/WO2010013839A1/en
Publication of JP2010040226A publication Critical patent/JP2010040226A/en
Publication of JP2010040226A5 publication Critical patent/JP2010040226A5/ja
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/64—Heating or cooling; Temperature control characterised by the shape of the cells
    • H01M10/643—Cylindrical cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/613—Cooling or keeping cold
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
    • H01M10/623—Portable devices, e.g. mobile telephones, cameras or pacemakers
    • H01M10/6235—Power tools
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/651—Means for temperature control structurally associated with the cells characterised by parameters specified by a numeric value or mathematical formula, e.g. ratios, sizes or concentrations
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/213—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for cells having curved cross-section, e.g. round or elliptic
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/267—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders having means for adapting to batteries or cells of different types or different sizes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • 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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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biophysics (AREA)
  • Physics & Mathematics (AREA)
  • Algebra (AREA)
  • General Physics & Mathematics (AREA)
  • Mathematical Analysis (AREA)
  • Mathematical Optimization (AREA)
  • Pure & Applied Mathematics (AREA)
  • Secondary Cells (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery pack for electric tools, having a housing structure that improves the effect of cooling lithium-ion secondary battery cells housed. <P>SOLUTION: At least two lithium ion secondary batteries 3a and 3b whose capacities and dimensions are different from each other are assembled and housed in a battery pack 2, whereby space 2b is formed between the secondary battery cells 3a in the battery pack 2. This arrangement can enhance the effect of dissipating heat from the lithium-ion secondary battery cells 3a and 3b. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、複数のリチウムイオン二次電池から成る電動工具用電池パックに関し、特に、電動工具用電池パック内に収納される複数のリチウムイオン二次電池の熱放散を向上させるための収納構造に関する。   The present invention relates to a battery pack for an electric tool composed of a plurality of lithium ion secondary batteries, and particularly to a storage structure for improving heat dissipation of a plurality of lithium ion secondary batteries stored in the battery pack for an electric tool. .

コードレスタイプの電動工具において、一般に、電動工具の駆動電源としてリチウムイオン二次電池から構成された電池パックが適用されつつある。リチウムイオン電池パックは、ニッケルカドミウム電池やニッケル水素電池に比較してセル公称電圧が高く、かつ出力密度が高いため小形軽量であるという特徴を有する。さらに、放電効率も良く、比較的低温環境の中でも放電が可能で、広い温度範囲で安定した電圧を得ることができる特徴も有する。このため、リチウムイオン電池パックは、電動工具の軽量化、小型化、および作業効率の向上を図る電源として期待されている。   In a cordless type electric tool, generally, a battery pack composed of a lithium ion secondary battery is being applied as a driving power source of the electric tool. Lithium ion battery packs are characterized by a small and light weight because the cell nominal voltage is higher and the output density is higher than that of nickel cadmium batteries and nickel metal hydride batteries. Further, it has a good discharge efficiency, can be discharged even in a relatively low temperature environment, and can obtain a stable voltage in a wide temperature range. For this reason, the lithium ion battery pack is expected as a power source for reducing the weight, size and working efficiency of the electric tool.

コードレスタイプの電動工具の電源として用いられる、ニッケルカドミウム電池やニッケル水素電池等の電池パックを充電する場合、比較的大きな充電電流で充電すれば短時間で充電できるが、充電時において電池パック内の二次電池の発熱が大きくなってしまい、二次電池のサイクル寿命を短くする一つの原因となる。そこで、下記特許文献１に示されるように、電池パックを大きな充電電流によって短時間で充電するために、充電装置に冷却ファンを設ける技術が提案されている。これにより、電池パック内の温度上昇を抑制しながら、比較的大きな充電電流によって短時間で充電することが行われている。   When charging a battery pack such as a nickel cadmium battery or a nickel metal hydride battery used as a power source for a cordless power tool, it can be charged in a short time if it is charged with a relatively large charging current. The heat generated by the secondary battery is increased, which is one cause for shortening the cycle life of the secondary battery. Therefore, as shown in Patent Document 1 below, a technique for providing a cooling fan in a charging device has been proposed in order to charge a battery pack with a large charging current in a short time. Thereby, charging is performed in a short time with a relatively large charging current while suppressing a temperature rise in the battery pack.

特開２０００−３１２４４０号公報JP 2000-31440 A

上述した従来技術による充電装置では、充電装置に設けられた冷却ファンの風冷により電池パック内の二次電池セルが冷却される。しかし、電池パック内の二次電池セルの配列によっては、互いにより密集して隣接した電池セルは、充電時に互いに発生する熱の影響を受けて、電池パック内の他の位置に配列した二次電池セルに比較して冷却効果が低下することになる。このため、電池パック内に収納された複数の二次電池セルは、局部的に温度上昇が高くなるという問題が生ずる。   In the above-described conventional charging device, the secondary battery cells in the battery pack are cooled by the air cooling of the cooling fan provided in the charging device. However, depending on the arrangement of the secondary battery cells in the battery pack, the battery cells that are more closely adjacent to each other are affected by the heat generated at the time of charging, and the secondary battery cells arranged at other positions in the battery pack. A cooling effect will fall compared with a battery cell. For this reason, the problem that the temperature rise becomes high locally in the some secondary battery cell accommodated in the battery pack arises.

充電時における電池パック内の複数の二次電池セルへの冷却により、発熱を抑制し、サイクル寿命への劣化の進行を抑制する場合、複数の二次電池セルは、局部的な温度上昇の度合いにより劣化の進行度が異なってくる。すなわち、電池パック内の冷却効率が悪い場所に配置された二次電池セルは、冷却効率が良い電池セルに比較して、充放電のサイクル寿命を損なうことになる。   When cooling to a plurality of secondary battery cells in a battery pack during charging, heat generation is suppressed and the progress of deterioration to the cycle life is suppressed. Degree of deterioration varies depending on That is, the secondary battery cell arranged in a place where the cooling efficiency in the battery pack is poor deteriorates the cycle life of charge / discharge compared to the battery cell having good cooling efficiency.

特に、電池パックを構成する複数の二次電池がリチウムイオン電池の場合、充放電のサイクル寿命が温度に依存する。リチウムイオン二次電池は、過放電を起こすと負極の銅箔が溶出する場合がある。この状態で充電すると溶出した銅がデンドライト（樹状の析出物）として負極に析出し、セパレータを貫通し内部短絡を引き起こす危険性がある。   In particular, when the secondary batteries constituting the battery pack are lithium ion batteries, the charge / discharge cycle life depends on the temperature. When a lithium ion secondary battery overdischarges, the negative electrode copper foil may be eluted. When charged in this state, the eluted copper is deposited on the negative electrode as dendrites (dendritic precipitates), and there is a risk of causing an internal short circuit through the separator.

電池パック内に異なる劣化度を有する複数の二次電池セルが混在する場合、より劣化度が進行している二次電池セルは、放電時において他の二次電池セルに比べて電圧降下の具合が早い。   When a plurality of secondary battery cells having different degrees of deterioration are mixed in the battery pack, the secondary battery cells having a higher degree of deterioration are more likely to have a voltage drop than other secondary battery cells during discharge. Is early.

一般的に、複数のリチウムイオン二次電池を有する電池パック内には、過放電および過充電を防止するための保護ＩＣやマイコンが設けられている。このような保護回路では、電池パック内に収納された複数の二次電池セルについて１セル毎の電池電圧を監視し、複数の二次電池セルの少なくとも一つが所定の放電電圧以下に低下した場合、過放電であると判別して放電を停止させるように構成したものである。また、充電時には、１セル毎の充電電圧が所定電圧を超えないように監視して過充電による劣化を抑制している。   In general, in a battery pack having a plurality of lithium ion secondary batteries, a protection IC and a microcomputer for preventing overdischarge and overcharge are provided. In such a protection circuit, the battery voltage for each cell is monitored for a plurality of secondary battery cells housed in the battery pack, and at least one of the plurality of secondary battery cells falls below a predetermined discharge voltage. Thus, it is determined that the discharge is overdischarged and the discharge is stopped. Moreover, at the time of charge, it monitors so that the charging voltage for every cell may not exceed predetermined voltage, and suppresses degradation by overcharge.

この時、劣化度の異なる二次電池セルが混在していると、より劣化度が進行した二次電池セルについては、放電時の電圧降下がより早くなるため、前述したある放電電圧に早く低下してしまうので、早く放電を停止してしまう結果となる。このように、各二次電池セルの放熱効果のばらつきにより、電池パック全体としての放電容量または充電容量が減少し、結果として電池パックのサイクル寿命が短くなる。   At this time, if secondary battery cells with different degrees of deterioration are mixed, the secondary battery cells with more advanced degrees of deterioration will have a faster voltage drop at the time of discharge. As a result, the discharge is quickly stopped. Thus, due to the variation in the heat dissipation effect of each secondary battery cell, the discharge capacity or charge capacity of the battery pack as a whole is reduced, and as a result, the cycle life of the battery pack is shortened.

このような問題点を、図３および図４に示す従来の電動工具用電池パックについて具体的に説明する。図３は、従来の電動工具用電池パックにおける、８個のリチウムイオン二次電池セル３ａの収納構造を示す。図３において、（ａ）は、胴体ハウジング部１ａと、ハンドルハウジング部１ｂと、先端工具部（例えば、ドライバビット）１ｃと、胴体ハウジング部１ａ内に収納された電動モータ１ｄと、から構成された電動工具本体１を示す。（ｂ）は、前記電動工具本体のハンドルハウジング部１ｂに着脱容易に装着される電池パック２を示し、電池パック２は、保護回路基板４およびリチウムイオン二次電池セル３ａを収納する。（ｃ）は、一般的に使用されている円筒状のリチウムイオン二次電池セル３ａのサイズを示す。（ｄ）は８個の電池セル３ａの電気的接続形態を、（ｅ）は８個の電池セル３ａの収納配列状態をそれぞれ示す。   Such a problem will be described in detail with respect to the conventional battery pack for electric tools shown in FIGS. FIG. 3 shows a housing structure for eight lithium ion secondary battery cells 3a in a conventional battery pack for electric tools. In FIG. 3, (a) is comprised from the fuselage | housing housing part 1a, the handle | steering-wheel housing part 1b, the front-end | tip tool part (for example, driver bit) 1c, and the electric motor 1d accommodated in the torso housing part 1a. 1 shows a power tool body 1. (B) shows the battery pack 2 that is easily attached to and detached from the handle housing portion 1b of the electric power tool body, and the battery pack 2 houses the protection circuit board 4 and the lithium ion secondary battery cell 3a. (C) shows the size of a generally used cylindrical lithium ion secondary battery cell 3a. (D) shows the electrical connection form of the eight battery cells 3a, and (e) shows the storage arrangement state of the eight battery cells 3a.

上記８個の円筒状電池セル３ａのサイズは、１．５Ａｈの容量を有する直径１８０ｍｍ、長さ６５０ｍｍで、一対が並列接続された電池組を構成し、電池組の４対が直列接続されている。なお、電池パック２内には、過充電および過放電を防止するための保護回路基板（保護ＩＣ）４が収納されている。この従来例では、リチウムイオン電池の公称電圧は、１４．４Ｖ（３．６Ｖ／セル×４組）であり、また公称容量は、３．０Ａｈ（１．５Ａｈ×２個＝３．０Ａｈ）である。   The size of the eight cylindrical battery cells 3a is a diameter of 180 mm having a capacity of 1.5 Ah and a length of 650 mm, and a pair of batteries is connected in parallel, and four pairs of battery sets are connected in series. Yes. The battery pack 2 houses a protection circuit board (protection IC) 4 for preventing overcharge and overdischarge. In this conventional example, the nominal voltage of the lithium ion battery is 14.4 V (3.6 V / cell × 4 sets), and the nominal capacity is 3.0 Ah (1.5 Ah × 2 = 3.0 Ah). is there.

かかる従来の配列状態では、隣接する二次電池セル３ａ間の距離が狭いので、隣り合った二次電池セル３ａ間の熱の影響を非常に受けやすい。また、電池セル３ａと電池パック２のハウジング２ａ間の空間が少ないため、例えば電池パック２内を充電装置に設置された冷却ファン等を用いて冷却しようとしても、電池セル３ａの発熱による暖かい空気が電池パック２のハウジング２ａ内にこもり、充分な冷却効果が得られない構成となっている。   In such a conventional arrangement state, since the distance between the adjacent secondary battery cells 3a is narrow, it is very easily affected by the heat between the adjacent secondary battery cells 3a. Further, since the space between the battery cell 3a and the housing 2a of the battery pack 2 is small, for example, even if an attempt is made to cool the inside of the battery pack 2 using a cooling fan or the like installed in the charging device, warm air due to heat generated by the battery cell 3a However, it is confined in the housing 2a of the battery pack 2, and a sufficient cooling effect cannot be obtained.

一方、図４は、図３の二次電池セル３ａとサイズ（種類）が異なる、３．０Ａｈの電流容量を有する円筒形状の二次電池セル３ｂ（例えば、直径２６０ｍｍ×長さ６５０ｍｍ）を、４本直列に接続し、上述した図３に示した電池パックと同様に、公称電圧１４．４Ｖおよび公称容量３．０Ａｈの電池パック２を構成したものである。図３に示した従来例と比較すると、電池セル３ｂと電池パック２のハウジング２ａ間の空間が広いため、隣接する電池セル３ｂ間には空気が流れやすく、より冷却効果に適した構成となる。しかし、電池セル３ｂ間の収納空間が広くなるので、電池パック２自体のサイズが大きくなってしまうという問題点がある。   On the other hand, FIG. 4 shows a cylindrical secondary battery cell 3b (for example, a diameter of 260 mm × a length of 650 mm) having a current capacity of 3.0 Ah, which is different in size (type) from the secondary battery cell 3a of FIG. In the same manner as the battery pack shown in FIG. 3 described above, four battery packs 2 having a nominal voltage of 14.4 V and a nominal capacity of 3.0 Ah are configured. Compared with the conventional example shown in FIG. 3, since the space between the battery cell 3b and the housing 2a of the battery pack 2 is wide, air easily flows between the adjacent battery cells 3b, and the configuration is more suitable for the cooling effect. . However, since the storage space between the battery cells 3b becomes wide, there is a problem that the size of the battery pack 2 itself becomes large.

したがって、本発明の目的は、上記従来技術の欠点を解消し、収納されるリチウムイオン二次電池セルの冷却効果を向上させた収納形態を有する電動工具用電池パックを提供することにある。   Accordingly, an object of the present invention is to provide a battery pack for an electric tool having a storage configuration that eliminates the drawbacks of the prior art and improves the cooling effect of the stored lithium ion secondary battery cells.

本発明の他の目的は、占有体積が比較的少ないリチウムイオン二次電池セルの収納配列を可能にした電動工具用電池パックを提供することにある。   Another object of the present invention is to provide a battery pack for an electric tool that enables storage arrangement of lithium ion secondary battery cells having a relatively small occupied volume.

上記課題を解決するために本発明に従って開示される発明のうち、代表的なものの特徴を説明すれば、次のとおりである。   Among the inventions disclosed in accordance with the present invention in order to solve the above problems, the characteristics of typical ones will be described as follows.

本発明の一つの特徴によれば、複数のリチウムイオン二次電池を収納し、前記複数のリチウムイオン二次電池を互いに電気的接続するための電動工具用電池パックにおいて、前記複数のリチウムイオン二次電池の中、少なくとも一つ以上のリチウムイオン二次電池は、残りのリチウムイオン二次電池とサイズが異なるように構成する。   According to one aspect of the present invention, in the battery pack for an electric tool for storing a plurality of lithium ion secondary batteries and electrically connecting the plurality of lithium ion secondary batteries to each other, the plurality of lithium ion secondary batteries is provided. Among the secondary batteries, at least one lithium ion secondary battery is configured to be different in size from the remaining lithium ion secondary batteries.

本発明の他の特徴によれば、前記複数のリチウムイオン二次電池の中、少なくとも一対は、電気的に並列接続されるように構成する。   According to another aspect of the present invention, at least one pair of the plurality of lithium ion secondary batteries is configured to be electrically connected in parallel.

本発明のさらに他の特徴によれば、前記複数のリチウムイオン二次電池は、円筒形状のリチウムイオン二次電池から構成され、該円筒形状のリチウムイオン二次電池の直径は、少なくとも大小２種類のサイズを有する。   According to still another aspect of the present invention, each of the plurality of lithium ion secondary batteries includes a cylindrical lithium ion secondary battery, and the cylindrical lithium ion secondary battery has at least two types of diameters. Have a size of

本発明のさらに他の特徴によれば、前記複数のリチウムイオン二次電池の中、少なくとも一対は、残りのものより前記直径が小さく、かつ互いに電気的に並列接続され、前記残りのリチウムイオン二次電池は、互いに互いに電気的に直列接続されている。   According to still another aspect of the present invention, at least one pair of the plurality of lithium ion secondary batteries is smaller in diameter than the remaining ones and is electrically connected in parallel to each other, The secondary batteries are electrically connected to each other in series.

上記本発明の特徴によれば、リチウムイオン二次電池セルを収納する電池パック内の収納配列に自由度を持たせることが可能となるので、占有体積を大きくすることなく、二次電池セルの冷却効果を向上させた電池パックを提供することができる。
本発明の上記および他の目的、ならびに上記および他の特徴は、以下の本明細書の記述および添付図面からさらに明らかにされるであろう。 According to the above feature of the present invention, the storage arrangement in the battery pack that stores the lithium ion secondary battery cell can be given a degree of freedom, so that the secondary battery cell can be manufactured without increasing the occupied volume. A battery pack having an improved cooling effect can be provided.
The above and other objects, and the above and other features of the present invention will become more apparent from the following description of the present specification and the accompanying drawings.

以下、本発明の電動工具用電池パックに係る実施形態について、図１および図２を参照して説明する。なお、実施形態を説明するための図１および図２の図面、ならびに上記従来技術に関する図３および図４の図面において、同一の機能を有する部材には同一の符号を付し、その繰返しの説明を省略する場合がある。   Hereinafter, an embodiment according to the battery pack for an electric tool of the present invention will be described with reference to FIGS. 1 and 2. In FIGS. 1 and 2 for explaining the embodiment, and in FIGS. 3 and 4 relating to the prior art, members having the same function are denoted by the same reference numerals, and repeated description thereof is provided. May be omitted.

図１に示した電動工具用電池パックにおいて、（ａ）は、胴体ハウジング部１ａと、ハンドルハウジング部１ｂと、先端工具部（例えば、ドライバビット）１ｃと、胴体ハウジング部１ａ内に収納された電動モータ１ｄと、から構成された電動工具本体１を示す。（ｂ）は、前記電動工具本体のハンドルハウジング部１ｂに着脱容易に装着される電池パック２を示し、電池パック２は、保護回路基板４と、サイズが異なる２種類のリチウムイオン二次電池セル３ａおよび３ｂを収納する。（ｃ）は、サイズの異なる２種類の円筒状のリチウムイオン二次電池セル３ａおよび３ｂのサイズを示す。（ｄ）は５個の電池セル３ａおよび３ｂの電気的接続形態を、（ｅ）は５個の電池セル３ａおよび３ｂの収納配列状態をそれぞれ示す。   In the battery pack for the electric tool shown in FIG. 1, (a) is housed in the body housing part 1a, the handle housing part 1b, the tip tool part (for example, driver bit) 1c, and the body housing part 1a. The electric tool main body 1 comprised from the electric motor 1d is shown. (B) shows the battery pack 2 that can be easily attached to and detached from the handle housing portion 1b of the electric power tool body. The battery pack 2 is different from the protective circuit board 4 in two types of lithium ion secondary battery cells. 3a and 3b are accommodated. (C) shows the sizes of two types of cylindrical lithium ion secondary battery cells 3a and 3b having different sizes. (D) shows the electrical connection form of the five battery cells 3a and 3b, and (e) shows the storage arrangement state of the five battery cells 3a and 3b, respectively.

本実施形態によれば、電池パック２は、リチウムイオン二次電池セル３として、図１の（ｃ）に示すように、サイズが互いに異なる２種類の電池パック３ａおよび３ｂを収納する。すなわち、図１の（ｃ）および（ｄ）に示すように、直径２６０ｍｍ×長さ６５０ｍｍのサイズで、容量３．０Ａｈを有する二次電池セル３ｂを３本直列接続する。一方、直径１８０ｍｍ×長さ６５０ｍｍのサイズで、容量１．５Ａｈを有する二次電池セル３ａを２本並列接続して容量３．０Ａ（１．５Ａｈ×２個＝３．０Ａｈ）を構成する。これら３本の二次電池セル３ｂと２本の二次電池セル３ａを図１の（ｅ）に示すように積層し、図１の（ｂ）に示すように、電池パック２のハウジング２ａ内に収納する。   According to the present embodiment, the battery pack 2 stores two types of battery packs 3a and 3b having different sizes as the lithium ion secondary battery cell 3 as shown in FIG. That is, as shown in FIGS. 1C and 1D, three secondary battery cells 3b having a size of diameter 260 mm × length 650 mm and a capacity of 3.0 Ah are connected in series. On the other hand, two secondary battery cells 3a having a diameter of 180 mm × length of 650 mm and a capacity of 1.5 Ah are connected in parallel to form a capacity of 3.0 A (1.5 Ah × 2 = 3.0 Ah). These three secondary battery cells 3b and two secondary battery cells 3a are stacked as shown in FIG. 1 (e), and inside the housing 2a of the battery pack 2 as shown in FIG. 1 (b). Store in.

このように異なる種類のサイズを組合せた構成により、図３に示した従来技術（直径１８０ｍｍ×長さ６５０ｍｍのサイズ３ａを２本並列接続した電池組を４組直列接続したもの）と同等な電流容量（３．０Ａｈ）を得ることができると共に、従来の電池パックと同程度の大きさにかかわらず、電池パック２内には、隣接する二次電池セル３ａ間のスペース２ｂを広くとれるので、冷却効果に優れた電池パックを提供することができる。   In this way, by combining different types of sizes, current equivalent to that of the prior art shown in FIG. 3 (four battery sets in which two size 3a having a diameter of 180 mm × length of 650 mm are connected in parallel) is connected. The capacity (3.0 Ah) can be obtained, and the space 2b between the adjacent secondary battery cells 3a can be widened in the battery pack 2 regardless of the size of the conventional battery pack. A battery pack having an excellent cooling effect can be provided.

図２は、本発明に係る他の実施形態を示す。本実施形態では、図２の（ｃ）および（ｄ）に示すように、容量１．５Ａｈの小サイズ（直径１８０ｍｍ×長さ６５０ｍｍ）の二次電池セル３ａの１対を並列接続して電流容量３．０Ａｈの電池組を構成し、これら２対を直列接続する。他方、容量３．０Ａｈの大サイズ（直径２６０ｍｍ×長さ６５０ｍｍ）の二次電池セル３ｂを２個直列接続し、前記並列接続した小サイズ３ａの電池組と直列接続する。図２の（ｅ）に示すように、小サイズの二次電池セル３ａは上列に配置し、大サイズの二次電池セル３ｂは下列に配置し、図２の（ｂ）に示すように電池パック２のハウジング２ａ内に収納する。このように異なる種類のサイズを組合せた構成により、図１に示した実施形態と同様に、電池パック２内には、隣接する二次電池セル３ｂ間のスペース２ｂを広くとれるので、冷却効果に優れた電池パックを提供することができる。さらに、本発明の電池パック２を電動工具本体１に組合せて使用すれば、先端工具１ｃによる過放電時における電池パック２の温度上昇を抑制できるので、電池パック２の寿命を向上できる。   FIG. 2 shows another embodiment according to the present invention. In this embodiment, as shown in FIGS. 2C and 2D, a pair of secondary battery cells 3a having a capacity of 1.5 Ah and a small size (diameter: 180 mm × length: 650 mm) are connected in parallel to obtain a current. A battery set with a capacity of 3.0 Ah is formed, and these two pairs are connected in series. On the other hand, two large-sized (diameter 260 mm × length 650 mm) secondary battery cells 3 b having a capacity of 3.0 Ah are connected in series and connected in series to the small-sized battery set 3 a connected in parallel. As shown in FIG. 2 (e), the small-sized secondary battery cells 3a are arranged in the upper row, the large-sized secondary battery cells 3b are arranged in the lower row, and as shown in FIG. 2 (b). The battery pack 2 is housed in the housing 2a. With the configuration in which different types of sizes are combined in this manner, the space 2b between the adjacent secondary battery cells 3b can be widened in the battery pack 2 as in the embodiment shown in FIG. An excellent battery pack can be provided. Furthermore, if the battery pack 2 of the present invention is used in combination with the electric tool main body 1, the temperature rise of the battery pack 2 during overdischarge by the tip tool 1c can be suppressed, so that the life of the battery pack 2 can be improved.

以上の実施形態の説明から明らかにされるように、本発明によれば、電池パック内に収納するリチウムイオン二次電池のサイズを少なくとも大小２種類で構成することにより、電池パック内の放熱効果を向上させることができる。   As will be apparent from the above description of the embodiment, according to the present invention, the heat dissipation effect in the battery pack can be achieved by configuring the size of the lithium ion secondary battery housed in the battery pack in at least two types. Can be improved.

以上、本発明者によってなされた発明を実施形態に基づき具体的に説明したが、本発明は上記実施形態に限定されるものでなく、その要旨を逸脱しない範囲内で種々の変更が可能である。   As mentioned above, the invention made by the present inventor has been specifically described based on the embodiments. However, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention. .

本発明に係る電動工具用電池パックの一実施形態を示す構成図。The block diagram which shows one Embodiment of the battery pack for electric tools which concerns on this invention. 本発明に係る電動工具用電池パックの他の実施形態を示す構成図。The block diagram which shows other embodiment of the battery pack for electric tools which concerns on this invention. 従来技術に係る電動工具用電池パックの一例を示す構成図。The block diagram which shows an example of the battery pack for electric tools which concerns on a prior art. 従来技術に係る電動工具用電池パックの他の例を示す構成図。The block diagram which shows the other example of the battery pack for electric tools which concerns on a prior art.

符号の説明Explanation of symbols

１：電動工具本体 １ａ：胴体ハウジング部 １ｂ：ハンドルハウジング部
１ｃ：先端工具（ドライバビット） １ｄ：電動モータ ２：電池パック
２ａ：ハウジング ２ｂ：電池パック内のスペース
３、３ａ、３ｂ：リチウムイオン二次電池セル ４：保護回路基板 DESCRIPTION OF SYMBOLS 1: Electric tool main body 1a: Body housing part 1b: Handle housing part 1c: Tip tool (driver bit) 1d: Electric motor 2: Battery pack 2a: Housing 2b: Space 3, 3a, 3b in battery pack 2 Secondary battery cell 4: Protection circuit board

Claims (4)

複数のリチウムイオン二次電池を収納し、前記複数のリチウムイオン二次電池を互いに電気的接続するための電動工具用電池パックにおいて、前記複数のリチウムイオン二次電池の中、少なくとも一つ以上のリチウムイオン二次電池は、残りのリチウムイオン二次電池とサイズが異なることを特徴とする電動工具用電池パック。   In a battery pack for an electric tool for storing a plurality of lithium ion secondary batteries and electrically connecting the plurality of lithium ion secondary batteries to each other, at least one of the plurality of lithium ion secondary batteries The lithium ion secondary battery is different from the remaining lithium ion secondary battery in size, and is a battery pack for an electric tool. 前記複数のリチウムイオン二次電池の中、少なくとも一対は、電気的に並列接続されていることを特徴とする請求項１に記載された電動工具用電池パック。   2. The battery pack for an electric tool according to claim 1, wherein at least a pair of the plurality of lithium ion secondary batteries is electrically connected in parallel. 前記複数のリチウムイオン二次電池は、円筒形状のリチウムイオン二次電池から構成され、該円筒形状のリチウムイオン二次電池の直径は、少なくとも大小２種類のサイズを有することを特徴とする請求項１または請求項２に記載された電動工具用電池パック。   The plurality of lithium ion secondary batteries are constituted by cylindrical lithium ion secondary batteries, and the diameters of the cylindrical lithium ion secondary batteries have at least two sizes of large and small. The battery pack for electric tools described in claim 1 or 2. 前記円筒形状の前記複数のリチウムイオン二次電池の中、少なくとも一対は、残りのものより前記直径が小さく、かつ互いに電気的に並列接続され、前記残りのリチウムイオン二次電池は、互いに互いに電気的に直列接続されていることを特徴とする請求項３に記載された電動工具用電池パック。   Among the plurality of lithium ion secondary batteries having the cylindrical shape, at least one pair is smaller in diameter than the remaining ones and is electrically connected in parallel to each other, and the remaining lithium ion secondary batteries are electrically connected to each other. The battery pack for electric tools according to claim 3, wherein the battery packs are connected in series.
JP2008199129A 2008-08-01 2008-08-01 Battery pack for electric tools Pending JP2010040226A (en)

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