JP4227762B2 - Assembled battery unit and connecting method of assembled battery unit - Google Patents

Assembled battery unit and connecting method of assembled battery unit Download PDF

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JP4227762B2
JP4227762B2 JP2002160361A JP2002160361A JP4227762B2 JP 4227762 B2 JP4227762 B2 JP 4227762B2 JP 2002160361 A JP2002160361 A JP 2002160361A JP 2002160361 A JP2002160361 A JP 2002160361A JP 4227762 B2 JP4227762 B2 JP 4227762B2
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Prior art keywords
assembled battery
battery unit
pair
electrode tabs
insulating sheet
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JP2004006141A (en
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寿 田中
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Subaru Corp
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Fuji Jukogyo KK
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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

Description

【０００１】
【発明の属する技術分野】
本発明は、組電池ユニットおよび組電池ユニットの接続方法に関する。
【０００２】
【従来の技術】
例えば、ハイブリッド車や電気自動車などのように、電源として高電圧バッテリを用いる場合、複数の電池セルを直列接続して組電池ユニット化する。そして、所望の電圧または容量を得るために、組電池ユニットを直列または並列に接続している。
【０００３】
特開平１１−１６２４４３号公報には、組電池ユニットの構造が開示されている。このユニットは、複数のシート状電池セルを積層することによって形成されている。それぞれの電池セルには、電極タブが突出して設けられており、これらの互いに隣接する異極の電極タブ同士を接合することによって電池セルを直列接続している。この電池セルにおいて、電極タブの突出部位は他の部位よりも薄くなっており、その空間に電極タブ同士の接続部位が配置される。これにより、電池セルの積層空間の低減を図り、省スペース化を図っている。
【０００４】
【発明が解決しようとする課題】
ところで、電極タブの接合手法としては、溶接、ネジ接続、リベット接続、或いは、超音波接続等が挙げられる。ところが、リチウムイオン電池であるラミネートセルを電池セルに用いた場合には、電極タブが薄板金属によって形成されているため、溶接等の技術は困難である。また、ネジやリベットによる接続では、電極タブ同士の接続部位がネジ頭やリベットによって厚みを帯びることから、隣接する電極接続部位間の絶縁性の確保が容易ではないので、接合作業効率の低下を招きやすい。
【０００５】
そこで、このような薄板金属同士の接続には、超音波接続によって行なわれているのが一般的である。しかしながら、超音波接続では、１個所の電極タブ同士を接続する度に、バッテリ電位が急激に上昇して、電撃が生じ易い。このため、接続作業の安全性を高める必要がある。
【０００６】
本発明は、かかる事情に鑑みてなされたものであり、その目的は、電池セル同士の接続を効率的に行い、電極の絶縁性を確保し、かつ、接続作業性の向上を図ることである。
【０００７】
【課題を解決するための手段】
かかる課題を解決するために、第１の発明に係る組電池ユニットは、一方向に重ね合わされた複数の電池セルを有する。これらの重ね合わされた電池セルのそれぞれに突出する電極タブは、一方向に電極タブ群として並んでいる。そして、隣接した一対の正極タブおよび負極タブが、複数の面が蛇腹状に連結された絶縁性を有する絶縁シートの互いに対向した一対の面によって挟持され直列接続されている。
【０００８】
ここで、第１の発明においては、絶縁シートの両端部間を挟持する挟着部材を設けることが好ましい。
【０００９】
第２の発明は、組電池ユニットの接続方法を提供する。この接続方法では、まず、電極タブが突出した複数の電池セルを一方向に重ね合わせ、それぞれの電極タブを一方向に並べる。つぎに、隣接した一対の正極タブおよび負極タブを、複数の面が蛇腹状に連結された絶縁性を有する絶縁シートの互いに対向した一対の面によって挟持して直列接続する。そして、一対の電極タブを一対の面で挟持した状態で、絶縁シートの両端部間を挟着部材によって挟持する。
【００１０】
【発明の実施の形態】
図１は、本実施形態における組電池ユニットを形成する組電池本体の概略的断面図である。図２は、電池セルの斜視図である。図１に示すように、組電池本体１は、複数の電池セルを複数重ね合わせて積層した構造を有しており、電池セルとしては、例えば、薄板状のラミネートセル２を用いることができる。これらのラミネートセル２は、図２に示すように、例えば、リチウムイオン電池３と、このリチウムイオン電池３を外装するラミネートシート４とで形成されている。ラミネートセル２の上端側には、例えば、アルミニウム等の薄板金属によって形成された正極側電極タブ（以下、正極タブという）５が突出して設けられている。一方、ラミネートセル２の下端側には、例えば、ニッケル等の薄板金属によって形成された負極側電極タブ（以下、負極タブという）６が突出して設けられている。
【００１１】
それぞれのラミネートセル２は、背中合わせに重なり合うように、交互に反転させて並べられ、正極タブ５と負極タブ６とが一方向に対面するように配置されている。互いに隣接するラミネートセル２における正極タブ５と負極タブ６との間には、絶縁性を有する絶縁シート７，９が介在されている。これらの絶縁シート７，９は、各々のラミネートセル２の並列方向に展開および折り畳み自在な蛇腹状の形状を有する。第１の絶縁シート７は、Ｖ字状または逆Ｖ字状に対向する一対の対面７ａ，７ｂによって電極タブ対５，６を挟持する。同様に、第２の絶縁シート９は、Ｖ字状または逆Ｖ字状に対向する一対の対面９ａ，９ｂによって、電極タブ対５，６を挟持する。これによって、異極の電極タブ５，６同士が接合されるため、ラミネートセル２が直列に接続される。
【００１２】
また、第１および第２の絶縁シート７，９の各対面７ａ，７ｂおよび９ａ，９ｂには、折り畳み状態において、各々のラミネートセル２の並列方向に貫通するボルト孔８，１０がそれぞれ開設されている。そして、これらのボルト孔８，１０には、ボルト１１が絶縁シート７，９の一端側より挿通される。そして、このボルト１１には、ナット１２がそれぞれの絶縁シート７，９の他端側から螺合される。これらの部材１１，１２の締付力により、絶縁シート７，９によって挟持された各々のラミネートセル２のそれぞれの電極接続部位が締付け固定される。
【００１３】
図３から図５は、本実施形態における電池セルの接続方法を説明するための図である。図３は、絶縁シートの展開時における電池セルの配列状態の一部斜視図である。図４は、絶縁シートの展開時における電池セルの配列状態の概略的断面図である。図５は、絶縁シートによる電池セルの挟持状態の概略的断面図である。なお、図３においては、ラミネートセル２の配列状態を下半部側のみ示したが、ラミネートセル２の上半部側もほぼ同様の構成を有する。
【００１４】
すなわち、隣接するラミネートセル２における接続部位の電極タブ対５，６間を接続するには、図３および図４に示すように、複数のラミネートセル２を背中合わせに重なり合うように反転させて交互に並列する。これによって、正極タブ５と負極タブ６とが一方向に対向する。つぎに、互いに隣接するラミネートセル２における正極タブ５と負極タブ６との間に、絶縁性を有する第１および第２の絶縁シート７，９が介在させる。上述したように、それぞれの絶縁シート７，９は、それぞれのラミネートセル２の配列方向に伸縮自在な蛇腹状の形状を有する。このため、それぞれのラミネートセル２は、絶縁シート７，９の展開状態において、Ｖ字状または逆Ｖ字状に対向した対面７ａ，７ｂおよび９ａ，９ｂ間に差し込まれる。
【００１５】
この差し込み状態において、それぞれの絶縁シート７，９が、図４に実線矢印で示す縮小方向に折り畳まれる。これによって、図５に示すように、互いに隣接するラミネートセル２における電極タブ対５，６は、絶縁シート７，９の各対面７ａ，７ｂおよび９ａ，９ｂによって挟持される。
【００１６】
このように折り畳んだ状態において、各絶縁シート７，９の一端側からボルト１１が対面７ａ，７ｂおよび対面９ａ，９ｂにそれぞれ設けられたボルト孔８，１０に挿通される。ボルト１１を挿通した後、このボルト１１に絶縁シート７，９の他端側からナット１２が螺合される。これによって、絶縁シート７，９に挟持されたラミネートセル２の電極接続部位が挟着状態で締付け固定される。
【００１７】
なお、上述した実施形態においては、絶縁シート７，９を挟持するために、ボルト１１とナット１２との係合による締付力を利用しているが、本発明は、これに限定されるものではない。例えば、これ以外にも、クリップやスプリングといった挟着部材を用いることも当然可能である。
【００１８】
【発明の効果】
このように、本発明によれば、電池セル同士の接続を効率的に行うことができ、電極の絶縁性を確保でき、かつ、接続作業性の向上を図ることができる。
【図面の簡単な説明】
【図１】本実施形態における組電池ユニットを形成する組電池本体の概略的断面図
【図２】電池セルの斜視図
【図３】絶縁シートの展開時における電池セルの配列状態の一部斜視図
【図４】絶縁シートの展開時における電池セルの配列状態の概略的断面図
【図５】絶縁シートによる電池セルの挟持状態の概略的断面図
【符号の説明】
１ 組電池本体
２ 電池セル（ラミネートセル）
３ リチウムイオン電池
４ ラミネートシート
５ 正極側電極タブ（正極タブ）
６ 負極側電極タブ（負極タブ）
７ 第１の絶縁シート
７ａ，７ｂ 対面
８ ボルト孔
９ 第２の絶縁シート
９ａ，９ｂ 対面
１０ ボルト孔
１１ ボルト
１２ ナット[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an assembled battery unit and a method for connecting the assembled battery unit .
[0002]
[Prior art]
For example, when a high voltage battery is used as a power source, such as a hybrid vehicle or an electric vehicle, a plurality of battery cells are connected in series to form an assembled battery unit. In order to obtain a desired voltage or capacity, the assembled battery units are connected in series or in parallel.
[0003]
Japanese Patent Application Laid-Open No. 11-162443 discloses a structure of an assembled battery unit. This unit is formed by stacking a plurality of sheet-like battery cells. Each battery cell is provided with protruding electrode tabs, and the battery cells are connected in series by joining the electrode tabs having different polarities adjacent to each other. In this battery cell, the protruding portion of the electrode tab is thinner than the other portion, and the connecting portion between the electrode tabs is disposed in the space. Thereby, the stacking space of the battery cells is reduced and space saving is achieved.
[0004]
[Problems to be solved by the invention]
By the way, welding, screw connection, rivet connection, ultrasonic connection, etc. are mentioned as a joining method of an electrode tab. However, when a laminate cell that is a lithium ion battery is used for the battery cell, a technique such as welding is difficult because the electrode tab is formed of a thin metal plate. In addition, when connecting with screws or rivets, the connection parts between the electrode tabs are thickened by the screw heads or rivets, so it is not easy to ensure insulation between the adjacent electrode connection parts. Easy to invite.
[0005]
Therefore, the connection between such thin metal plates is generally performed by ultrasonic connection. However, in ultrasonic connection, each time one electrode tab is connected, the battery potential rises rapidly and electric shock is likely to occur. For this reason, it is necessary to improve the safety of connection work.
[0006]
This invention is made | formed in view of this situation, The objective is to perform the connection of battery cells efficiently, ensuring the insulation of an electrode, and aiming at the improvement of a connection workability | operativity. .
[0007]
[Means for Solving the Problems]
In order to solve this problem, the assembled battery unit according to the first invention has a plurality of battery cells stacked in one direction. The electrode tabs projecting from each of these stacked battery cells are arranged as a group of electrode tabs in one direction. A pair of adjacent positive electrode tabs and negative electrode tabs are sandwiched and connected in series by a pair of opposed surfaces of an insulating sheet having insulating properties in which a plurality of surfaces are connected in a bellows shape.
[0008]
Here, in 1st invention, it is preferable to provide the clamping member which clamps between the both ends of an insulating sheet.
[0009]
2nd invention provides the connection method of an assembled battery unit . In this connection method, first, a plurality of battery cells with protruding electrode tabs are overlapped in one direction, and the respective electrode tabs are arranged in one direction. Next, a pair of adjacent positive electrode tabs and negative electrode tabs are sandwiched and connected in series by a pair of opposed surfaces of an insulating sheet having insulating properties in which a plurality of surfaces are connected in a bellows shape. And in the state which clamped a pair of electrode tab with a pair of surface, between the both ends of an insulating sheet is clamped by the clamping member.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a schematic cross-sectional view of an assembled battery body that forms an assembled battery unit in the present embodiment. FIG. 2 is a perspective view of the battery cell. As shown in FIG. 1, the assembled battery body 1 has a structure in which a plurality of battery cells are stacked and stacked. As the battery cells, for example, a thin laminate cell 2 can be used. As shown in FIG. 2, these laminate cells 2 are formed of, for example, a lithium ion battery 3 and a laminate sheet 4 that covers the lithium ion battery 3. On the upper end side of the laminate cell 2, for example, a positive electrode tab (hereinafter referred to as a positive electrode tab) 5 formed of a thin metal such as aluminum is provided so as to protrude. On the other hand, on the lower end side of the laminate cell 2, for example, a negative electrode tab (hereinafter referred to as a negative electrode tab) 6 formed of a thin metal plate such as nickel is provided so as to protrude.
[0011]
The respective laminate cells 2 are alternately inverted and arranged so as to overlap each other, and the positive electrode tab 5 and the negative electrode tab 6 are arranged so as to face each other in one direction. Insulating sheets 7 and 9 having insulating properties are interposed between the positive electrode tab 5 and the negative electrode tab 6 in the laminate cells 2 adjacent to each other. These insulating sheets 7 and 9 have a bellows shape that can be expanded and folded in the parallel direction of the respective laminate cells 2. The first insulating sheet 7 sandwiches the electrode tab pairs 5 and 6 by a pair of facing surfaces 7a and 7b facing in a V shape or an inverted V shape. Similarly, the second insulating sheet 9 sandwiches the electrode tab pairs 5 and 6 by a pair of facing surfaces 9a and 9b facing each other in a V shape or an inverted V shape. Thereby, since the electrode tabs 5 and 6 of different polarity are joined together, the laminate cells 2 are connected in series.
[0012]
In addition, bolt holes 8 and 10 are formed in the facing surfaces 7a and 7b and 9a and 9b of the first and second insulating sheets 7 and 9 so as to penetrate in the parallel direction of the respective laminate cells 2 in the folded state. ing. The bolts 11 are inserted into the bolt holes 8 and 10 from one end side of the insulating sheets 7 and 9. Then, a nut 12 is screwed to the bolt 11 from the other end side of each of the insulating sheets 7 and 9. Due to the clamping force of these members 11 and 12, the respective electrode connection portions of the respective laminate cells 2 sandwiched between the insulating sheets 7 and 9 are clamped and fixed.
[0013]
3-5 is a figure for demonstrating the connection method of the battery cell in this embodiment. FIG. 3 is a partial perspective view of the arrangement state of the battery cells when the insulating sheet is unfolded. FIG. 4 is a schematic cross-sectional view of an arrangement state of battery cells when the insulating sheet is developed. FIG. 5 is a schematic cross-sectional view of a state in which the battery cell is held by an insulating sheet. In FIG. 3, only the lower half side of the arrangement state of the laminate cells 2 is shown, but the upper half side of the laminate cells 2 has a substantially similar configuration.
[0014]
That is, in order to connect between the electrode tab pairs 5 and 6 at the connection site in the adjacent laminate cells 2, as shown in FIG. 3 and FIG. 4, the plurality of laminate cells 2 are inverted so as to overlap each other alternately. Parallel. As a result, the positive electrode tab 5 and the negative electrode tab 6 face each other in one direction. Next, the insulating first and second insulating sheets 7 and 9 are interposed between the positive electrode tab 5 and the negative electrode tab 6 in the laminate cell 2 adjacent to each other. As described above, each of the insulating sheets 7 and 9 has a bellows-like shape that can be expanded and contracted in the arrangement direction of the respective laminate cells 2. Therefore, each laminate cell 2 is inserted between the facing surfaces 7a, 7b and 9a, 9b facing each other in a V shape or an inverted V shape when the insulating sheets 7, 9 are unfolded.
[0015]
In this inserted state, the respective insulating sheets 7 and 9 are folded in a reduction direction indicated by solid line arrows in FIG. Thereby, as shown in FIG. 5, the electrode tab pairs 5 and 6 in the laminate cells 2 adjacent to each other are sandwiched by the facing surfaces 7a and 7b and 9a and 9b of the insulating sheets 7 and 9, respectively.
[0016]
In such a folded state, the bolts 11 are inserted from the one end sides of the insulating sheets 7 and 9 into the bolt holes 8 and 10 provided in the facing surfaces 7a and 7b and the facing surfaces 9a and 9b, respectively. After inserting the bolt 11, the nut 12 is screwed to the bolt 11 from the other end side of the insulating sheets 7 and 9. Thereby, the electrode connection portion of the laminate cell 2 sandwiched between the insulating sheets 7 and 9 is fastened and fixed in a sandwiched state.
[0017]
In the above-described embodiment, the clamping force generated by the engagement between the bolt 11 and the nut 12 is used to sandwich the insulating sheets 7 and 9, but the present invention is limited to this. is not. For example, it is naturally possible to use a clamping member such as a clip or a spring in addition to this.
[0018]
【The invention's effect】
Thus, according to the present invention, the battery cells can be efficiently connected to each other, the insulation of the electrodes can be ensured, and the connection workability can be improved.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view of an assembled battery body forming an assembled battery unit in the present embodiment. FIG. 2 is a perspective view of a battery cell. FIG. 3 is a partial perspective view of an arrangement state of battery cells when an insulating sheet is unfolded. FIG. 4 is a schematic cross-sectional view of an arrangement state of battery cells when the insulating sheet is unfolded. FIG. 5 is a schematic cross-sectional view of a state in which battery cells are held by an insulating sheet.
1 Battery pack body 2 Battery cell (laminate cell)
3 Lithium ion battery 4 Laminate sheet 5 Positive electrode tab (positive electrode tab)
6 Negative electrode tab (negative electrode tab)
7 First insulating sheets 7a, 7b facing 8 bolt holes 9 Second insulating sheets 9a, 9b facing 10 bolt holes 11 bolts 12 nuts

Claims (3)

一方向に重ね合わされた複数の電池セルと、
重ね合わされた前記電池セルのそれぞれに突出して設けられた電極タブが一方向に並んだ電極タブ群と、
絶縁性を有し、複数の面が蛇腹状に連結されており、かつ、互いに対向した一対の面によって、隣接した一対の正極タブおよび負極タブを挟持して直列接続する絶縁シートと
を有することを特徴とする組電池ユニット。A plurality of battery cells stacked in one direction;
An electrode tab group in which electrode tabs provided to protrude from each of the stacked battery cells are arranged in one direction;
Insulating sheet, having a plurality of surfaces connected in a bellows shape, and having an insulating sheet that is connected in series with a pair of adjacent positive and negative electrode tabs sandwiched between a pair of opposing surfaces An assembled battery unit characterized by 前記絶縁シートの両端部間を挟持する挟着部材をさらに有することを特徴とする請求項１に記載された組電池ユニット。The assembled battery unit according to claim 1, further comprising a sandwiching member that sandwiches between both end portions of the insulating sheet. 組電池ユニットの接続方法において、
電極タブが突出した複数の電池セルを一方向に重ね合わせ、それぞれの電極タブを一方向に並べるステップと、
複数の面が蛇腹状に連結された絶縁性を有する絶縁シートにおける互いに対向した一対の面によって、隣接した一対の正極タブおよび負極タブを挟持して直列接続するステップと、
前記一対の電極タブを前記一対の面で挟持した状態で、前記絶縁シートの両端部間を挟着部材によって挟持するステップと
を有することを特徴とする組電池ユニットの接続方法。 In the connection method of the assembled battery unit ,
Overlaying a plurality of battery cells from which electrode tabs protrude in one direction, and arranging each electrode tab in one direction;
Step of sandwiching a pair of adjacent positive electrode tabs and negative electrode tabs by a pair of surfaces facing each other in an insulating sheet having insulating properties in which a plurality of surfaces are connected in a bellows shape, and connecting in series
Said pair of electrode tabs while sandwiched by the pair of surfaces, the connection method of an assembled battery unit, characterized in that a step of sandwiching between both end portions of the insulating sheet by clamped members.
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