WO2007034703A1 - Battery pack - Google Patents

Battery pack Download PDF

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Publication number
WO2007034703A1
WO2007034703A1 PCT/JP2006/317988 JP2006317988W WO2007034703A1 WO 2007034703 A1 WO2007034703 A1 WO 2007034703A1 JP 2006317988 W JP2006317988 W JP 2006317988W WO 2007034703 A1 WO2007034703 A1 WO 2007034703A1
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WO
WIPO (PCT)
Prior art keywords
battery
insulating paper
battery cells
cells
assembled
Prior art date
Application number
PCT/JP2006/317988
Other languages
French (fr)
Japanese (ja)
Inventor
Naoya Goto
Original Assignee
Sanoh Kogyo Kabushiki Kaisha
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sanoh Kogyo Kabushiki Kaisha filed Critical Sanoh Kogyo Kabushiki Kaisha
Publication of WO2007034703A1 publication Critical patent/WO2007034703A1/en

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Classifications

    • 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
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
    • 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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
    • H01M50/593—Spacers; Insulating plates
    • 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
    • H01M50/233—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions
    • H01M50/24—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions adapted for protecting batteries from their environment, e.g. from corrosion
    • 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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/588—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries outside the batteries, e.g. incorrect connections of terminals or busbars
    • 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

Definitions

  • the present invention relates to an assembled battery in which insulating paper is attached to a terminal surface so that terminals and connection plates of individual battery cells constituting the assembled battery are not short-circuited via an external conductor.
  • Secondary batteries in which secondary battery cells are connected in series, are widely used in various applications including electric bicycles and hybrid vehicles. In recent years, battery capacity and density have been rapidly increasing.
  • reference number BC indicates individual battery cells constituting the assembled battery.
  • the battery cell BC starts from number 1. Connect in series in order of No.11!
  • the battery cells BC are arranged in series connection order! /, In other words, arranged in two columns, an even-numbered column and an odd-numbered column, and the odd-numbered column battery cell BC and the even-numbered column
  • the polarity of battery cell BC is upside down.
  • Fig. 9 shows that No. 2 and No. 3, No. 4 and No. 5, No. 6 and No. 7, No. 8 and No. 9, and No. 10 and No. 11 are connected using the connection terminal board 12.
  • the connection terminal board with the same number 1 and 2, 3 and 4, 5 and 6, 7 and 8, and 9 and 10 Is connected using.
  • a positive terminal plate 14a is attached to the first battery cell BC, and a negative terminal plate 14b is attached to the 11th battery cell BC.
  • the object of the present invention is to solve the problems of the prior art, and even if the electrolyte leaks from the battery cell, a voltage of 2 cells or more is applied to the insulating paper.
  • the purpose of the present invention is to provide a battery pack that can prevent smoke and fire and improve safety by not applying voltage.
  • the present invention provides an assembled battery in which a plurality of battery cells are connected, and insulates the terminal surfaces of each of the plurality of battery cells connected by a single connection plate. Insulating paper is attached, and each insulating paper is separated and independent from each other.
  • the insulating paper includes glasses-shaped insulating paper corresponding to the end face contour shape of two adjacent battery cells, and a bowl shape covering the entire terminal surfaces of two adjacent battery cells. Insulating paper can be used.
  • the terminal surface side of the assembled battery in which the battery cells are assembled is entirely insulated with insulating paper to form a bypass current path having a large resistance.
  • a plurality of slits are formed in the insulating paper.
  • the slit in the insulating paper, the slit extends along between connecting plates connecting adjacent battery cells, and a region where current flows when two or more battery cells are short-circuited is divided. It is preferable to arrange the slits so that they do.
  • the insulating paper can be reliably prevented from smoking and igniting, and the safety of the assembled battery can be improved. Enhance be able to.
  • FIG. 1 is a plan view showing insulating paper used for a battery pack according to a first embodiment of the present invention.
  • FIG. 2 is a plan view of an assembled battery to which the glasses-shaped insulating paper of FIG. 1 is applied.
  • FIG. 3 is a plan view of the assembled battery of FIG. 2 in which electrolyte leakage occurs in the battery cell.
  • FIG. 4 is a plan view showing a cell arrangement of a battery pack to which the saddle-shaped insulating paper of FIG. 1 is applied.
  • FIG. 5 is a plan view of an assembled battery to which the bowl-shaped insulating paper of FIG. 1 is applied.
  • FIG. 6 is a plan view showing insulating paper used for the assembled battery according to the second embodiment of the present invention.
  • FIG. 7 is a plan view of an assembled battery in which the insulating paper of FIG. 6 is attached to the terminal surface.
  • FIG. 8 is a plan view of the assembled battery for explaining the operation of the assembled battery of the second embodiment.
  • FIG. 9 is a plan view showing the arrangement of battery cells in the assembled battery.
  • FIG. 10 is a plan view of a conventional yarn and battery.
  • FIG. 11 is a plan view of conventional insulating paper used for the battery pack of FIG.
  • FIG. 1 shows an insulating paper used for the assembled battery according to the first embodiment of the present invention.
  • the insulating paper of the assembled battery a sheet in which two adjacent battery cells are pasted through a single connection plate is used.
  • FIG. 1 illustrates two types of insulating paper 20 and 21 having different shapes depending on the arrangement of the battery cells. Among them, the insulating paper 20 is used for the assembled battery having the cell arrangement shown in FIG. 9, and the insulating paper 21 is used for the assembled battery having the cell arrangement shown in FIG.
  • the first battery cell BC is in contact with the valley between the second and third battery cells BC
  • the third battery cell BC is One battery cell BC is always in contact with the adjacent cell and the valley of the cell, such as being in contact with the valley of the battery cell BC of No. 5.
  • the insulating paper 20 is an insulating paper having a shape of a spectacle in accordance with the feature of the arrangement of the battery cells BC.
  • the insulating paper material itself is a well-known material used for this type of battery pack. As shown in FIG. 2, the insulating paper 20 just corresponds to the end face contour shape of the two adjacent battery cells BC, whereby the insulating paper 20 is separated and independent from each other.
  • the insulating paper 21 is used for a battery pack having a cell array as shown in FIG. In this assembled battery, they are connected in series in the order of their numbers. In this cell arrangement, the polarities of cells adjacent in the width direction are reversed, and the polarities of cells adjacent in the length direction are also reversed.
  • the connection plate connects cells adjacent in the width direction. In FIG. 4, the side that appears to be V ⁇ is also connected by the connecting plate 12 in the same manner.
  • the insulating paper 21 is an insulating paper having a bowl shape.
  • the width of the insulating paper is approximately the same as the diameter of the battery cell, and both ends are semicircles having the same curvature as the cross-sectional shape of the battery cell.
  • the insulating paper 21 can cover the entire terminal surfaces of the battery cells adjacent to each other through the connection plate 12, and the insulating papers 21 are separated and independent from each other. .
  • Fig. 2 for some reason, for example, the battery cells BC # 3 and # 5 are damaged and the electrolyte leaks, and as shown in Fig. 3, the leaked electrolyte is shaded by the insulating paper 20a and 20b. It shall penetrate into the indicated range.
  • the insulation performance of the insulating papers 20a and 20b deteriorates due to the permeation of the electrolyte, and a current flows when a voltage is applied to the insulating papers 20a and 20b.
  • the insulating paper 20a, 20b infiltrated with electrolyte is short-circuited with battery cells BC of No. 2 and No. 3, or No. 4 and No. 5. I'm not letting you. Also, since the insulating papers 20a and 20b are separated and independent, they do not come into contact with each other, for example, the third and fourth battery cells BC do not short-circuit. Therefore, unlike the continuous insulation paper, the voltage of two or more battery cells BC is not applied by the permeation of the electrolyte, so it is possible to reliably prevent smoke and fire.
  • FIG. 6 shows the insulating paper 30 used for the assembled battery according to the second embodiment
  • FIG. 7 shows the finished assembled battery with the insulating paper 30 attached thereto.
  • This second embodiment differs from the first embodiment in which the adjacent cells are insulated, and is an assembled battery in which all the cells are insulated using a single sheet of insulating paper 30.
  • the cell arrangement shown in FIG. This is an example applied to a battery that has it.
  • a plurality of slits 32a to 32e are formed in order to form a bypass current path with increased resistance.
  • the positions of slits 32a to 32e correspond to the arrangement of battery cells BC, and as shown in Fig. 8, the numbers 2 and 3 and the numbers 4 and 5 Assuming that No. 6 and No. 7, No. 8 and No. 9, and No. 10 and No. 11 are connected using the connecting plate 12, the slits 32a to 32e respectively extend between the connecting plates. Is formed.
  • connection plates are used for connection, the slits are similarly formed to extend between the connection plates.
  • the slit 32b extends in the insulating paper 30 so as to divide the current flowing region, the current flows around the slit 32b as shown by an arrow. Then, since the current flows through a narrow portion having a large resistance near the end of the slit 32b, the current value is reduced by the amount of the increased resistance, and the generated Joule heat can be reduced. As a result, even if the voltage for two or more battery cells is strong, by flowing the current through the bypass current path with increased resistance, the current value can be reduced to prevent smoke and ignition. It becomes possible to suppress Joule heat.

Abstract

A battery pack in which emission of smoke and ignition are prevented to enhance safety by preventing application of voltages of two or more cells to an insulating paper even if an electrolyte leaks from a battery cell. In the battery pack formed by connecting battery cells (BC), a sheet of insulating paper (20) is adhered to each set of battery cells that are connected by a single connection plate (12), insulating terminal surfaces of the cells. The sheets of insulating paper (20) are separated from and independent of each other.

Description

明 細 書  Specification
組電池  Assembled battery
技術分野  Technical field
[0001] 本発明は、組電池を構成する個々のバッテリセルの端子及び接続板が外部導電体 を介して短絡しな 、ように端子面に絶縁紙を貼り付けた組電池に関する。  [0001] The present invention relates to an assembled battery in which insulating paper is attached to a terminal surface so that terminals and connection plates of individual battery cells constituting the assembled battery are not short-circuited via an external conductor.
背景技術  Background art
[0002] 二次電池バッテリセルを直列につな 、だ組電池は、電動式自転車、ハイブリッド車 をはじめとして、さまざまな用途に広く利用されている。そして近年では、バッテリの高 容量化、高密度化が急速に進んでいる。  [0002] Secondary batteries, in which secondary battery cells are connected in series, are widely used in various applications including electric bicycles and hybrid vehicles. In recent years, battery capacity and density have been rapidly increasing.
従来の中型または大型の組電池は、ノ ッテリセルを個々に収容する個室を持った ケースを利用していた。このようなケースを利用すると、ノ ッテリセルの数が多くなるも のでは、ケースの重量が加わり糸且電池が重くなること、また、ケース自体の製作コスト が高いことなどの欠点があり、これに代わる組電池として、図 9に示すようなコンパクト 化および軽量ィ匕を図った組電池がある。  Conventional medium- or large-sized assembled batteries have used cases with individual chambers that individually accommodate the battery cells. If such a case is used, the number of battery cells increases. However, the weight of the case increases and the yarn and battery become heavy, and the manufacturing cost of the case itself is high. As an alternative battery pack, there is a battery pack designed for compactness and light weight as shown in Fig. 9.
[0003] 図 9において、参照番号 BCは、組電池を構成する個々のバッテリセルを示している この組電池では、一つ一つのバッテリセル BCを番号で区別すると、バッテリセル BC は 1番から 11番の順で直列に接続されて!、る。  [0003] In Fig. 9, reference number BC indicates individual battery cells constituting the assembled battery. In this assembled battery, when each battery cell BC is distinguished by a number, the battery cell BC starts from number 1. Connect in series in order of No.11!
[0004] ノ ッテリセル BCは、直列の接続順で!/ヽえば、偶数番号の列と、奇数番号の列の 2 列に配列され、奇数番号の列のバッテリセル BCと、偶数番号の列のバッテリセル BC とでは、極性が上下逆さになっている。図 9では、 2番と 3番、 4番と 5番、 6番と 7番、 8 番と 9番、 10番と 11番とが接続端子板 12を用いて接続されて ヽるのが示されて ヽる 力 図 9に表れない方の側では 1番と 2番、 3番と 4番、 5番と 6番、 7番と 8番、 9番と 10 番が同じような接続端子板を用いて接続されている。そして、 1番のノ ッテリセル BC には正極の端子板 14aが取り付けられ、 11番のバッテリセル BCには負極の端子板 1 4bが取り付けられている。  [0004] The battery cells BC are arranged in series connection order! /, In other words, arranged in two columns, an even-numbered column and an odd-numbered column, and the odd-numbered column battery cell BC and the even-numbered column The polarity of battery cell BC is upside down. Fig. 9 shows that No. 2 and No. 3, No. 4 and No. 5, No. 6 and No. 7, No. 8 and No. 9, and No. 10 and No. 11 are connected using the connection terminal board 12. On the side that does not appear in Fig. 9, the connection terminal board with the same number 1 and 2, 3 and 4, 5 and 6, 7 and 8, and 9 and 10 Is connected using. A positive terminal plate 14a is attached to the first battery cell BC, and a negative terminal plate 14b is attached to the 11th battery cell BC.
[0005] このような糸且電池では、ノ ッテリセル BC同士が短絡しないように外部と絶縁する必 要があり、図 11に示すような絶縁紙 16を端子面に貼り付けている。この絶縁紙 16を 図 9のバッテリセル BCの端子面に貼り付けると、図 10のようになる。 [0005] In such a thread-and-battery, it is necessary to insulate the battery cells BC from the outside so as not to short-circuit each other. Insulating paper 16 as shown in Fig. 11 is attached to the terminal surface. When this insulating paper 16 is affixed to the terminal surface of the battery cell BC in FIG. 9, the result is as shown in FIG.
発明の開示  Disclosure of the invention
発明が解決しょうとする課題  Problems to be solved by the invention
[0006] し力しながら、この種の簡易型の組電池では、軽量、安価と!/、う利点がある反面、バ ッテリセル BCが破損等したり、寿命末や異常時の圧力上昇もあるため、電解液が漏 れ出した場合に、絶縁紙にしみこんだ電解液を介した短絡により絶縁紙 16に電流が 流れ、そのジュール熱により発煙、発火に至ることがある。 [0006] However, this type of simple battery pack has advantages of light weight and low cost! /, On the other hand, the battery cell BC is damaged, and there is also a rise in pressure at the end of life or abnormal conditions. For this reason, when the electrolyte leaks, a current flows through the insulating paper 16 due to a short circuit through the electrolytic solution soaked in the insulating paper, and the Joule heat may cause smoke and ignition.
[0007] そこで、本発明の目的は、前記従来技術の有する問題点を解消し、万一バッテリセ ルカゝら電解液が漏れ出すような事態になっても、絶縁紙に 2セル以上の電圧が印加 されないようにして、発煙、発火を防止し安全性を高めることができるようにした組電 池を提供することにある。 [0007] Therefore, the object of the present invention is to solve the problems of the prior art, and even if the electrolyte leaks from the battery cell, a voltage of 2 cells or more is applied to the insulating paper. The purpose of the present invention is to provide a battery pack that can prevent smoke and fire and improve safety by not applying voltage.
課題を解決するための手段  Means for solving the problem
[0008] 前記の目的を達成するために、本願発明は、複数のバッテリセルを接続してなる組 電池において、一枚の接続板で接続される複数のバッテリセル単位で、その端子面 を絶縁する絶縁紙を貼付し、各絶縁紙は互いに分離独立していることを特徴とするも のである。 [0008] In order to achieve the above object, the present invention provides an assembled battery in which a plurality of battery cells are connected, and insulates the terminal surfaces of each of the plurality of battery cells connected by a single connection plate. Insulating paper is attached, and each insulating paper is separated and independent from each other.
[0009] この発明では、例として絶縁紙には、隣り合う 2つのバッテリセルの端面輪郭形状に 対応するめがね形の絶縁紙や、隣合う 2つのバッテリセルの端子面全体をカバーす る俵形の絶縁紙を用いることができる。  [0009] In the present invention, for example, the insulating paper includes glasses-shaped insulating paper corresponding to the end face contour shape of two adjacent battery cells, and a bowl shape covering the entire terminal surfaces of two adjacent battery cells. Insulating paper can be used.
[0010] また、本願発明は、複数のバッテリセルを接続してなる組電池において、バッテリセ ルが集合した組電池の端子面側を絶縁紙で全体を絶縁し、抵抗の大きな迂回電流 経路を形成する複数のスリットを該絶縁紙に形成したことを特徴とするものである。  [0010] Further, according to the present invention, in an assembled battery in which a plurality of battery cells are connected, the terminal surface side of the assembled battery in which the battery cells are assembled is entirely insulated with insulating paper to form a bypass current path having a large resistance. A plurality of slits are formed in the insulating paper.
[0011] この発明では、前記絶縁紙には、前記スリットが隣り合うバッテリセルを接続する接 続板同士の間に沿って延び、 2以上のバッテリセルが短絡した場合に電流の流れる 領域を分断するように該スリットを配列して 、ることが好ま 、。  [0011] In the present invention, in the insulating paper, the slit extends along between connecting plates connecting adjacent battery cells, and a region where current flows when two or more battery cells are short-circuited is divided. It is preferable to arrange the slits so that they do.
[0012] 本発明によれば、ノ ッテリセルカゝら電解液が漏れ出しても、絶縁紙には大きな電流 が流れないので、絶縁紙の発煙、発火を確実に防止でき、組電池の安全性を高める ことができる。 [0012] According to the present invention, even if the electrolyte solution leaks from the battery cell, a large current does not flow through the insulating paper. Therefore, the insulating paper can be reliably prevented from smoking and igniting, and the safety of the assembled battery can be improved. Enhance be able to.
図面の簡単な説明  Brief Description of Drawings
[0013] [図 1]本発明の第 1実施形態による組電池に利用される絶縁紙を示す平面図。  FIG. 1 is a plan view showing insulating paper used for a battery pack according to a first embodiment of the present invention.
[図 2]図 1のめがね形の絶縁紙を適用した組電池の平面図。  FIG. 2 is a plan view of an assembled battery to which the glasses-shaped insulating paper of FIG. 1 is applied.
[図 3]バッテリセルに電解液漏れの生じた図 2の組電池の平面図。  FIG. 3 is a plan view of the assembled battery of FIG. 2 in which electrolyte leakage occurs in the battery cell.
[図 4]図 1の俵形の絶縁紙を適用する組電池のセル配列を示す平面図。  FIG. 4 is a plan view showing a cell arrangement of a battery pack to which the saddle-shaped insulating paper of FIG. 1 is applied.
[図 5]図 1の俵形の絶縁紙を適用した組電池の平面図。  FIG. 5 is a plan view of an assembled battery to which the bowl-shaped insulating paper of FIG. 1 is applied.
[図 6]本発明の第 2実施形態による組電池に使用される絶縁紙を示す平面図。  FIG. 6 is a plan view showing insulating paper used for the assembled battery according to the second embodiment of the present invention.
[図 7]図 6の絶縁紙を端子面に貼り付けた組電池の平面図。  FIG. 7 is a plan view of an assembled battery in which the insulating paper of FIG. 6 is attached to the terminal surface.
[図 8]第 2実施形態の組電池の作用を説明する組電池の平面図。  FIG. 8 is a plan view of the assembled battery for explaining the operation of the assembled battery of the second embodiment.
[図 9]組電池におけるバッテリセルの配列を示す平面図。  FIG. 9 is a plan view showing the arrangement of battery cells in the assembled battery.
[図 10]従来の糸且電池の平面図。  FIG. 10 is a plan view of a conventional yarn and battery.
[図 11]図 10の組電池に使用される従来の絶縁紙の平面図。  FIG. 11 is a plan view of conventional insulating paper used for the battery pack of FIG.
発明を実施するための最良の形態  BEST MODE FOR CARRYING OUT THE INVENTION
[0014] 以下、本発明によるバッテリセルの絶縁方法および組電池用絶縁紙の一実施形態 について、添付の図面を参照しながら説明する。  Hereinafter, an embodiment of a battery cell insulation method and a battery pack insulation paper according to the present invention will be described with reference to the accompanying drawings.
[0015] 第 1実施形態  [0015] First embodiment
図 1は、本発明の第 1の実施形態による組電池に用いられる絶縁紙を示して ヽる。 この第 1実施形態では、組電池の絶縁紙として、一枚の接続板を介して隣合う 2つの バッテリセルを単位に貼り付けるものを用いている。そして図 1では、バッテリセルの 配列の違いに応じて形状の異なる二種類の絶縁紙 20、 21を例示している。このうち 、絶縁紙 20は、図 9に示したセル配列の組電池に使用され、絶縁紙 21は、図 4に示 すようなセル配列の組電池に使用されるものである。  FIG. 1 shows an insulating paper used for the assembled battery according to the first embodiment of the present invention. In the first embodiment, as the insulating paper of the assembled battery, a sheet in which two adjacent battery cells are pasted through a single connection plate is used. FIG. 1 illustrates two types of insulating paper 20 and 21 having different shapes depending on the arrangement of the battery cells. Among them, the insulating paper 20 is used for the assembled battery having the cell arrangement shown in FIG. 9, and the insulating paper 21 is used for the assembled battery having the cell arrangement shown in FIG.
[0016] そこで、絶縁紙 20を用いる組電池について説明する。  [0016] Therefore, an assembled battery using the insulating paper 20 will be described.
図 9に示す組電池のセル配列では、 2番と 3番、 4番と 5番、 6番と 7番、 8番と 9番、 10番と 11番とが接続板 12を用いて接続されているので、図 2に示すように、接続板 1 2を介して隣り合うバッテリセル BCを単位にして絶縁紙 20を貼り付けている。また、図 9には表れない方の端子側では、 1番と 2番、 3番と 4番、 5番と 6番、 7番と 8番、 9番と 10番が同じような接続板を用いて接続されて 、て、同じようにこれらの隣り合うバッテ リセル BCを単位に絶縁紙 20が貼り付けられている。 In the battery array of the assembled battery shown in Fig. 9, No. 2 and No. 3, No. 4 and No. 5, No. 6 and No. 7, No. 8 and No. 9, and No. 10 and No. 11 are connected using the connection plate 12. Therefore, as shown in FIG. 2, the insulating paper 20 is pasted in units of adjacent battery cells BC via the connection plate 12. Also, on the terminal side that does not appear in Fig. 9, on the 1st and 2nd, 3rd and 4th, 5th and 6th, 7th and 8th, 9th No. 10 is connected using the same connection plate, and the insulating paper 20 is pasted in the same manner with the adjacent battery cells BC as the unit.
[0017] このようなバッテリセル BCの配列では、たとえば、 1番のバッテリセル BCは、 2番と 3 番のバッテリセル BCの間の谷に接し、 3番のバッテリセル BCは、 4番と 5番のバッテリ セル BCの谷に接するというように、一つのバッテリセル BCは、必ず、隣り合うセルと セルの谷間に接するようになって 、る。  In such an array of battery cells BC, for example, the first battery cell BC is in contact with the valley between the second and third battery cells BC, and the third battery cell BC is One battery cell BC is always in contact with the adjacent cell and the valley of the cell, such as being in contact with the valley of the battery cell BC of No. 5.
[0018] そこで、絶縁紙 20は、ノ ッテリセル BCの配列の特徴に合わせて、めがね形の形状 をもつ絶縁紙である。絶縁紙の素材そのものは、この種の組電池に利用される周知 のものである。そして、図 2に示すように、絶縁紙 20は、隣合う 2つのバッテリセル BC の端面輪郭形状にちょうど対応しており、これにより、絶縁紙 20は互いに分離独立し ている。  [0018] Therefore, the insulating paper 20 is an insulating paper having a shape of a spectacle in accordance with the feature of the arrangement of the battery cells BC. The insulating paper material itself is a well-known material used for this type of battery pack. As shown in FIG. 2, the insulating paper 20 just corresponds to the end face contour shape of the two adjacent battery cells BC, whereby the insulating paper 20 is separated and independent from each other.
[0019] 次に、絶縁紙 21を用いる組電池について説明する。  Next, an assembled battery using the insulating paper 21 will be described.
[0020] 絶縁紙 21は、図 4に示すようにセル配列をもつ組電池に使用される。この組電池で は、番号の順に直列に接続されている。このセル配列では、幅方向に隣り合うセル同 士で極性が逆になつているとともに、長さ方向に隣り合うセル同士の極性も逆になつ ている。接続板は、幅方向に隣合うセル同士を接続している。この図 4では、表れて Vヽな 、側も同じように接続板 12によって接続されて 、る。  [0020] The insulating paper 21 is used for a battery pack having a cell array as shown in FIG. In this assembled battery, they are connected in series in the order of their numbers. In this cell arrangement, the polarities of cells adjacent in the width direction are reversed, and the polarities of cells adjacent in the length direction are also reversed. The connection plate connects cells adjacent in the width direction. In FIG. 4, the side that appears to be V ヽ is also connected by the connecting plate 12 in the same manner.
[0021] 絶縁紙 21は、ちょうど俵形の形状をもつ絶縁紙である。図 4のセル配列の場合、絶 縁紙の幅はバッテリセルの直径とほぼ同じにするとともに、両端部はバッテリセルの 断面形状と同じ曲率の半円になっている。これにより、図 4に示すように、絶縁紙 21 は、接続板 12を介して隣り合つているバッテリセルの端子面全体をカバーできるとと もに、各絶縁紙 21は互いに分離独立している。  [0021] The insulating paper 21 is an insulating paper having a bowl shape. In the case of the cell arrangement in Fig. 4, the width of the insulating paper is approximately the same as the diameter of the battery cell, and both ends are semicircles having the same curvature as the cross-sectional shape of the battery cell. As a result, as shown in FIG. 4, the insulating paper 21 can cover the entire terminal surfaces of the battery cells adjacent to each other through the connection plate 12, and the insulating papers 21 are separated and independent from each other. .
[0022] 次に、以上のような第 1実施形態の組電池の作用効果について説明する。  Next, the function and effect of the assembled battery of the first embodiment as described above will be described.
図 2において、なんらかの原因で、例えば、 3番、 5番のバッテリセル BCが破損し て電解液が漏れて、図 3に示すように、漏れ出た電解液が絶縁紙 20a、 20bの斜線 で示す範囲に浸透したものとする。電解液の浸透によって絶縁紙 20a、 20bの絶縁 性能が低下し、絶縁紙 20a、 20bには電圧が印加されると電流が流れるようになる。  In Fig. 2, for some reason, for example, the battery cells BC # 3 and # 5 are damaged and the electrolyte leaks, and as shown in Fig. 3, the leaked electrolyte is shaded by the insulating paper 20a and 20b. It shall penetrate into the indicated range. The insulation performance of the insulating papers 20a and 20b deteriorates due to the permeation of the electrolyte, and a current flows when a voltage is applied to the insulating papers 20a and 20b.
[0023] しカゝしながら、図 2の実施形態のように、接続板 12を介して接続されたバッテリセル BC同士を単位にして絶縁紙 20を貼り付けて ヽる組電池では、電解液の浸透した絶 縁紙 20a、 20bは、 2番と 3番、あるいは 4番と 5番のバッテリセル BCを短絡させている わけではない。また、それぞれの絶縁紙 20a、 20bは分離独立しているので、接触し 合うことはなぐ例えば、 3番と 4番のバッテリセル BCが短絡することはない。したがつ て、一枚続きの絶縁紙のように、電解液の浸透により 2個以上のバッテリセル BCの電 圧が力かることがないので、発煙、発火を確実に防止することができる。 [0023] The battery cell connected via the connection plate 12 as shown in the embodiment of FIG. In a battery pack in which insulating paper 20 is pasted in units of BC, the insulating paper 20a, 20b infiltrated with electrolyte is short-circuited with battery cells BC of No. 2 and No. 3, or No. 4 and No. 5. I'm not letting you. Also, since the insulating papers 20a and 20b are separated and independent, they do not come into contact with each other, for example, the third and fourth battery cells BC do not short-circuit. Therefore, unlike the continuous insulation paper, the voltage of two or more battery cells BC is not applied by the permeation of the electrolyte, so it is possible to reliably prevent smoke and fire.
[0024] 以上のめがね形の絶縁紙 20を用いた組電池の作用効果は、図 5の俵形の絶縁紙 21を用いた組電池にっ 、てもまったく同様である。  The effect of the assembled battery using the above-described glasses-shaped insulating paper 20 is exactly the same as that of the assembled battery using the bowl-shaped insulating paper 21 of FIG.
[0025] 第 2実施形態  [0025] Second Embodiment
次に、本発明の第 2の実施形態による組電池について、図 6、図 7を参照しながら 説明する。  Next, an assembled battery according to a second embodiment of the present invention will be described with reference to FIGS.
[0026] 図 6は、第 2実施形態による組電池に用いる絶縁紙 30を示し、図 7は、絶縁紙 30を 貼り付けた完成品の組電池を示す。  FIG. 6 shows the insulating paper 30 used for the assembled battery according to the second embodiment, and FIG. 7 shows the finished assembled battery with the insulating paper 30 attached thereto.
この第 2実施形態は、隣合うセル単位で絶縁した第 1実施形態と異なり、一枚の絶 縁紙 30を使って全セルを絶縁するようにした組電池であり、図 9のセル配列をもつ電 池に適用した例である。  This second embodiment differs from the first embodiment in which the adjacent cells are insulated, and is an assembled battery in which all the cells are insulated using a single sheet of insulating paper 30. The cell arrangement shown in FIG. This is an example applied to a battery that has it.
[0027] この絶縁紙 30では、抵抗を高めた迂回電流経路を形成するために、複数のスリット 32a乃至 32eが形成されている。図 6と図 9を対照するとわかるように、スリット 32a乃 至 32eの位置は、バッテリセル BCの配列に対応しており、図 8に示すように、 2番と 3 番、 4番と 5番、 6番と 7番、 8番と 9番、 10番と 11番とが接続板 12を用いて接続されて いるとすると、それぞれスリット 32a乃至 32eは、それぞれ接続板同士の間を延びるよ うに形成されている。  In this insulating paper 30, a plurality of slits 32a to 32e are formed in order to form a bypass current path with increased resistance. As can be seen by comparing Fig. 6 and Fig. 9, the positions of slits 32a to 32e correspond to the arrangement of battery cells BC, and as shown in Fig. 8, the numbers 2 and 3 and the numbers 4 and 5 Assuming that No. 6 and No. 7, No. 8 and No. 9, and No. 10 and No. 11 are connected using the connecting plate 12, the slits 32a to 32e respectively extend between the connecting plates. Is formed.
[0028] また、図 7には表れない方の端子側では、 1番と 2番、 3番と 4番、 5番と 6番、 7番と 8 番、 9番と 10番が同じような接続板を用いて接続されているので、同じようにスリットが 接続板同士の間を延びるように形成されている。  [0028] On the other side of the terminal not shown in Fig. 7, numbers 1 and 2, 3 and 4, 5 and 6, 7 and 8, and 9 and 10 are the same. Since the connection plates are used for connection, the slits are similarly formed to extend between the connection plates.
[0029] 次に、以上のように構成される第 2実施形態の作用効果について説明する。ノ ッテ リセルカも電解液が漏れて、図 8に示すように、漏れ出た電解液が絶縁紙 30の斜線 で示す範囲を浸透したものとする。 [0030] 電解液の浸透によって絶縁性能は低下し、絶縁紙 30には電流が流れるようになり、 図 8の場合であれば、少なくとも 3番と 4番のノ ッテリセルが短絡回路を形成して絶縁 紙 30にはバッテリセル 2個分の電圧が力かることになる。 Next, the operational effects of the second embodiment configured as described above will be described. It is assumed that the electrolyte cell also leaks and the leaked electrolyte penetrates the range indicated by the diagonal lines of the insulating paper 30 as shown in FIG. [0030] Insulation performance deteriorates due to permeation of the electrolyte, and current flows through the insulating paper 30. In the case of FIG. 8, at least No. 3 and No. 4 battery cells form a short circuit. The insulation paper 30 is powered by the voltage of two battery cells.
[0031] ところが、絶縁紙 30には、電流の流れる領域を分断するようにスリット 32bが延びて いるため、電流はスリット 32bを迂回して矢印のように流れる。そして、スリット 32bの終 端付近の抵抗の大きな狭隘部分を流れるので、抵抗の増した分だけ電流値は小さく なり、発生するジュール熱を減少させることができる。これによつて、ノ ッテリセル 2個 以上分の電圧が力かっても、抵抗を大きくした迂回電流経路に電流を流すようにする ことにより、電流値を小さくすることで発煙、発火に至らない程度にジュール熱を抑え ることが可能となる。  [0031] However, since the slit 32b extends in the insulating paper 30 so as to divide the current flowing region, the current flows around the slit 32b as shown by an arrow. Then, since the current flows through a narrow portion having a large resistance near the end of the slit 32b, the current value is reduced by the amount of the increased resistance, and the generated Joule heat can be reduced. As a result, even if the voltage for two or more battery cells is strong, by flowing the current through the bypass current path with increased resistance, the current value can be reduced to prevent smoke and ignition. It becomes possible to suppress Joule heat.

Claims

請求の範囲 The scope of the claims
[1] 複数のバッテリセルを接続してなる組電池にぉ 、て、  [1] An assembled battery formed by connecting a plurality of battery cells,
一枚の接続板で接続される複数のバッテリセル単位で、その端子面を絶縁する絶 縁紙を貼付し、各絶縁紙は互いに分離独立して 、る  Insulate the terminal surface of each battery cell that is connected by a single connection board, and attach the insulating paper to each of the battery cells.
ことを特徴とする組電池。  A battery pack characterized by that.
[2] 前記絶縁紙は、隣り合う 2つのバッテリセルの端面輪郭形状に対応するめがね形の 絶縁紙からなる  [2] The insulating paper is made of eyeglass-shaped insulating paper corresponding to the end face contour shape of two adjacent battery cells.
ことを特徴とする請求項 1に記載の組電池。  The assembled battery according to claim 1, wherein:
[3] 前記絶縁紙は、隣合う 2つのバッテリセルの端子面全体をカバーする俵形の絶縁 紙からなる [3] The insulating paper is a bowl-shaped insulating paper that covers the entire terminal surfaces of two adjacent battery cells.
ことを特徴とする請求項 1に記載の組電池。  The assembled battery according to claim 1, wherein:
[4] 複数のバッテリセルを接続してなる組電池にぉ 、て、 [4] An assembled battery formed by connecting a plurality of battery cells,
ノ ッテリセルが集合した組電池の端子面側を絶縁紙で全体を絶縁し、抵抗の大き な迂回電流経路を形成する複数のスリットを該絶縁紙に形成した  Insulated paper was used to insulate the terminal surface side of the assembled battery in which the battery cells were assembled, and a plurality of slits were formed in the insulating paper to form a detour current path with a large resistance.
ことを特徴とする組電池。  A battery pack characterized by that.
[5] 前記絶縁紙には、前記スリットが隣り合うバッテリセルを接続する端子板同士の間に 沿って延び、 2以上のバッテリセルが短絡した場合に電流の流れる領域を分断するよ うに該スリットを配列した [5] In the insulating paper, the slit extends so as to extend between the terminal plates connecting adjacent battery cells, and the slit flows so as to divide a current flowing region when two or more battery cells are short-circuited. Arranged
ことを特徴とする請求項 4に記載の組電池。  The assembled battery according to claim 4, wherein:
PCT/JP2006/317988 2005-09-26 2006-09-11 Battery pack WO2007034703A1 (en)

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