WO2014132536A1 - Electricity storage unit and electricity storage module - Google Patents

Electricity storage unit and electricity storage module Download PDF

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Publication number
WO2014132536A1
WO2014132536A1 PCT/JP2013/084206 JP2013084206W WO2014132536A1 WO 2014132536 A1 WO2014132536 A1 WO 2014132536A1 JP 2013084206 W JP2013084206 W JP 2013084206W WO 2014132536 A1 WO2014132536 A1 WO 2014132536A1
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Prior art keywords
power storage
conductive path
storage element
path
branch
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PCT/JP2013/084206
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French (fr)
Japanese (ja)
Inventor
高橋　秀夫
正邦 春日井
澤田　尚
洋樹 下田
正人 筒木
中川　謙治
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株式会社オートネットワーク技術研究所
住友電装株式会社
住友電気工業株式会社
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Publication of WO2014132536A1 publication Critical patent/WO2014132536A1/en

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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
    • H01M10/04—Construction or manufacture in general
    • H01M10/0413—Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes
    • 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
    • H01M50/209—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for prismatic or rectangular 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
    • H01M10/04—Construction or manufacture in general
    • H01M10/0436—Small-sized flat cells or batteries for portable equipment
    • 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
    • H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
    • H01M50/529—Intercell connections through partitions, e.g. in a battery casing
    • 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

An electricity storage unit comprises: a first conductive path (33) having a plurality of first branch paths (34A to 34C) branched so that a first terminal portion (29) and each of the positive electrode terminals (27A) of electricity storage elements (23 to 25) are connected in parallel with each other; and a second conductive path (38) having a plurality of second branch paths (39A to 39C) branched so that a second terminal portion (31) and each of the negative electrode terminals (27B) of the electricity storage elements (23 to 25) are connected in parallel with each other. In the electricity storage unit, the first branch path (34C) connected to one electricity storage element (25) among the electricity storage elements (23 to 25) has a larger resistance than the first branch paths (34A, 34B) connected to the electricity storage elements (23, 24) other than said one electricity storage element (25), and the second branch path (39A) connected to one electricity storage element (25) has a smaller resistance than the second branch paths (39C, 39B) connected to the electricity storage elements (23, 24) other than said one electricity storage element (25).

Description

蓄電ユニット及び蓄電モジュールPower storage unit and power storage module
　本発明は、蓄電ユニット及び蓄電モジュールに関する。 The present invention relates to a power storage unit and a power storage module.
　従来、正極及び負極の端子を有する扁平な形状の複数の蓄電素子を積み重ねて構成した蓄電モジュールが知られている。
　特許文献１では、正極タブ及び負極タブを有する扁平な形状の２次電池を積層し、これら積層された２次電池のタブをサイドホルダのバスバーに溶接等することで、複数の２次電池を直列や並列に接続している。 2. Description of the Related Art Conventionally, a power storage module that is configured by stacking a plurality of flat-shaped power storage elements having positive and negative terminals has been known.
In Patent Document 1, a plurality of secondary batteries are assembled by laminating a flat secondary battery having a positive electrode tab and a negative electrode tab, and welding or the like to the bus bar of the side holder. Connected in series or parallel.
特開２０１３－１２４５８号公報JP 2013-12458 A
　ところで、特許文献１では、扁平な形状の複数の蓄電素子を縦に積み重ねていたが、これとは異なり、蓄電素子を扁平な面が連なるように横並びに配置することも考えられる。
　ここで、横並びに配した蓄電素子を並列に接続するように導電路を配する場合、外部と接続される一対の端子と蓄電素子の電極との間で導電路を複数の経路に分岐させる必要がある。
　この場合、並列に分岐された経路毎に抵抗が異なると、各蓄電素子についての充放電電流がバランスせず、各蓄電素子の発熱量にアンバランスが生ずることがある。この結果、各蓄電素子毎の温度バラツキが大きくなり、組電池の寿命を縮めたり、故障を誘発したりする問題がある。 By the way, in Patent Document 1, a plurality of flat storage elements are stacked vertically, but unlike this, it is also conceivable that the storage elements are arranged side by side so that the flat surfaces are continuous.
Here, in the case where the conductive path is arranged so that the storage elements arranged side by side are connected in parallel, it is necessary to branch the conductive path into a plurality of paths between a pair of terminals connected to the outside and the electrode of the storage element. There is.
In this case, if the resistance is different for each of the paths branched in parallel, the charge / discharge current for each power storage element may not be balanced, and the amount of heat generated by each power storage element may be unbalanced. As a result, there is a problem that the temperature variation of each power storage element increases, and the life of the assembled battery is shortened or a failure is induced.
　本発明は上記のような事情に基づいて完成されたものであって、並列に接続された蓄電素子の複数の経路の抵抗のばらつきを抑制することを目的とする。 The present invention has been completed based on the above situation, and an object thereof is to suppress variation in resistance of a plurality of paths of power storage elements connected in parallel.
　本発明の蓄電ユニットは、扁平な形状であって、扁平な面に沿う方向に並んで配された正極及び負極の端子を有する複数の蓄電素子と、前記蓄電素子の正極の端子と電気的に接続される第１端子部と、前記蓄電素子の負極の端子と電気的に接続される第２端子部と、前記第１端子部と各前記蓄電素子の各前記正極の端子とを並列に接続するように分岐された複数の第１分岐路を有する第１導電路と、前記第２端子部と各前記蓄電素子の各前記負極の端子とを並列に接続するように分岐された複数の第２分岐路を有する第２導電路と、を備え、前記複数の蓄電素子のうち一の蓄電素子と接続される前記第１分岐路が前記一の蓄電素子以外の蓄電素子と接続される前記第１分岐路よりも抵抗が大きく、前記一の蓄電素子と接続される前記第２分岐路が前記一の蓄電素子以外の蓄電素子と接続される前記第２分岐路よりも抵抗が小さいところに特徴を有する。
　本構成によれば、複数の蓄電素子のうち一の蓄電素子と接続される第１分岐路が一の蓄電素子以外の蓄電素子と接続される第１分岐路よりも抵抗が大きく、一の蓄電素子と接続される第２分岐路が一の蓄電素子以外の蓄電素子と接続される第２分岐路よりも抵抗が小さくなっているため、第１導電路側の分流経路間の抵抗の相違を、同じ分流経路における第２導電路側の抵抗の相違で相殺することができる。よって、並列に接続された蓄電素子の複数の経路の抵抗のばらつきを抑制することが可能になる。 The power storage unit of the present invention has a flat shape, a plurality of power storage elements having positive and negative terminals arranged side by side in a direction along the flat surface, and a positive terminal of the power storage element electrically A first terminal part to be connected, a second terminal part electrically connected to the negative terminal of the power storage element, and the first terminal part and the positive terminal of each power storage element connected in parallel A plurality of first conductive paths having a plurality of first branch paths branched so as to connect the second terminal portion and each negative electrode terminal of each of the power storage elements in parallel. A second conductive path having two branch paths, wherein the first branch path connected to one of the plurality of power storage elements is connected to a power storage element other than the one power storage element. The second branch having a resistance larger than that of one branch path and connected to the one power storage element There has a characteristic where smaller resistance than the second branch passage connected to the storage element other than the one of the storage element.
According to this configuration, the first branch path connected to one power storage element among the plurality of power storage elements has a larger resistance than the first branch path connected to power storage elements other than one power storage element. Since the second branch path connected to the element has a smaller resistance than the second branch path connected to a power storage element other than one power storage element, the difference in resistance between the shunt paths on the first conductive path side is This can be offset by the difference in resistance on the second conductive path side in the same shunt path. Therefore, it is possible to suppress variation in resistance of a plurality of paths of power storage elements connected in parallel.
　上記構成の実施態様として以下の構成を有すれば好ましい。
・前記一の蓄電素子と接続される前記第１分岐路は、前記一の蓄電素子以外の蓄電素子と接続される前記第１分岐路よりも長さが長く、前記一の蓄電素子と接続される前記第２分岐路は、前記一の蓄電素子以外の蓄電素子と接続される前記第２分岐路よりも長さが短い。
　このようにすれば、導電路の長さを変えれば、抵抗のばらつきを抑制できる。 It is preferable to have the following configuration as an embodiment of the above configuration.
The first branch path connected to the one power storage element is longer than the first branch path connected to a power storage element other than the one power storage element, and is connected to the one power storage element. The second branch path is shorter than the second branch path connected to a power storage element other than the one power storage element.
In this way, variation in resistance can be suppressed by changing the length of the conductive path.
・前記第１導電路及び前記第２導電路の少なくとも一方は、バスバーによって形成されている。
　例えば、導電路が電線であれば、第１導電路や第２導電路を必要に応じて長さを変える等により抵抗のばらつきを抑制することが比較的容易であるが、バスバーの場合には、長さを変えることが容易ではない。本構成によれば、第１導電路及び第２導電路の少なくとも一方がバスバーによって形成されているため、第１導電路及び第２導電路の一方のみの長さを変えることが容易ではない場合であっても抵抗のばらつきを抑制できる。 -At least one of the first conductive path and the second conductive path is formed by a bus bar.
For example, if the conductive path is an electric wire, it is relatively easy to suppress variations in resistance by changing the length of the first conductive path and the second conductive path as necessary. It is not easy to change the length. According to this configuration, when at least one of the first conductive path and the second conductive path is formed by the bus bar, it is not easy to change the length of only one of the first conductive path and the second conductive path. Even so, variations in resistance can be suppressed.
・前記第１導電路及び前記第２導電路は、共にバスバーであり、前記各蓄電素子は、前記正極及び負極の端子が扁平な本体の片側に並んで配されており、前記第１導電路と前記第２導電路とは絶縁部材を介して重ねられている。
　このようにすれば、第１導電路と第２導電路の配置の制約により重ねられる場合に、経路の抵抗のばらつきを抑制することができる。 -Both said 1st conductive path and said 2nd conductive path are bus bars, and each said electrical storage element has arranged the terminal of the said positive electrode and a negative electrode along with one side of the flat main body, The said 1st conductive path And the second conductive path are overlapped via an insulating member.
In this way, when the first conductive path and the second conductive path are overlaid due to restrictions, variation in resistance of the path can be suppressed.
・前記第１端子部は、前記複数の蓄電素子の並び方向の一方の側に配され、前記第２端子部は、前記複数の蓄電素子の並び方向の他方の側に配されている。
　このようにすれば、第１端子部及び第２端子部の位置により分岐路の抵抗にばらつきが生じやすい場合に、簡素な構成で各経路の抵抗のばらつきを抑制することが可能になる。 The first terminal portion is disposed on one side in the arrangement direction of the plurality of power storage elements, and the second terminal portion is disposed on the other side in the arrangement direction of the plurality of power storage elements.
In this way, when the resistance of the branch path is likely to vary depending on the positions of the first terminal portion and the second terminal portion, it is possible to suppress the resistance variation of each path with a simple configuration.
・蓄電ユニットを複数備え、前記複数の蓄電ユニットが直列に接続されて構成されている。
　複数の蓄電素子を並列接続した蓄電ユニットを複数形成し、複数の蓄電ユニットを直列接続することで、所要の容量・電圧とすれば、万一、何らかの原因によって一つの蓄電素子の導通が失われた場合でも、その故障分を並列接続された他の蓄電素子により補うため、直ちに全体の導通不良には至らないという利点がある。
　本構成によれば、このような利点を得ることができる構成において、並列に接続された蓄電素子の複数の経路の抵抗のばらつきを抑制することが可能になる。 A plurality of power storage units are provided, and the plurality of power storage units are connected in series.
If multiple storage units are formed by connecting multiple storage elements in parallel and the storage units are connected in series to achieve the required capacity and voltage, the continuity of one storage element is lost for some reason. Even in this case, since the failure is compensated by other power storage elements connected in parallel, there is an advantage that the entire conduction failure does not immediately occur.
According to this configuration, in a configuration in which such advantages can be obtained, it is possible to suppress variation in resistance of a plurality of paths of power storage elements connected in parallel.
　本発明によれば、並列に接続された蓄電素子の複数の経路の抵抗のばらつきを抑制することが可能になる。 According to the present invention, it is possible to suppress variations in resistance of a plurality of paths of power storage elements connected in parallel.
実施形態１の蓄電モジュールを示す斜視図The perspective view which shows the electrical storage module of Embodiment 1. 積層体を示す斜視図The perspective view which shows a laminated body 最下層の蓄電ユニットを示す斜視図Perspective view showing the lowermost power storage unit 蓄電素子を示す斜視図The perspective view which shows an electrical storage element 最下層の蓄電ユニットの複数の蓄電素子、第１導電路及び第２導電路を示す斜視図The perspective view which shows the some electrical storage element of the lowermost electrical storage unit, a 1st conductive path, and a 2nd conductive path 最下層の蓄電ユニットの複数の蓄電素子、第１導電路及び第２導電路を示す平面図The top view which shows the some electrical storage element of a lowermost electrical storage unit, a 1st conductive path, and a 2nd conductive path 最下層の蓄電ユニットの複数の蓄電素子、第１導電路及び第２導電路を示す正面図Front view showing a plurality of power storage elements, a first conductive path, and a second conductive path of a lowermost power storage unit 第１端子部と第２端子部との間の電気的構成を示す図The figure which shows the electrical constitution between a 1st terminal part and a 2nd terminal part 最下層の蓄電ユニットの第１導電路を示す斜視図The perspective view which shows the 1st conductive path of the electrical storage unit of the lowest layer 最下層の蓄電ユニットの第１導電路を示す平面図The top view which shows the 1st conductive path of the electrical storage unit of the lowest layer 最下層の蓄電ユニットの第２導電路を示す斜視図The perspective view which shows the 2nd conductive path of the electrical storage unit of the lowest layer 最下層の蓄電ユニットの第２導電路を示す平面図The top view which shows the 2nd conductive path of the electrical storage unit of the lowest layer 最下層の蓄電ユニットに２層目の蓄電ユニットが重ねられた状態を示す斜視図The perspective view which shows the state in which the electrical storage unit of the 2nd layer was piled up on the electrical storage unit of the lowest layer 最下層の蓄電ユニットに２層目の蓄電ユニットが重ねられた状態を示す平面図The top view which shows the state by which the 2nd layer electrical storage unit was piled up on the electrical storage unit of the lowest layer 図４のＡ－Ａ断面図AA sectional view of FIG. 下から２層目の蓄電ユニットの複数の蓄電素子、第１導電路及び第２導電路を示す斜視図The perspective view which shows the some electrical storage element, 1st conductive path, and 2nd conductive path of the electrical storage unit of the 2nd layer from the bottom 下から２層目の蓄電ユニットの複数の蓄電素子、第１導電路及び第２導電路を示す平面図The top view which shows the some electrical storage element of the electrical storage unit of the 2nd layer from the bottom, the 1st conductive path, and the 2nd conductive path 下から２層目の蓄電ユニットの複数の蓄電素子、第１導電路及び第２導電路を示す正面図Front view showing a plurality of power storage elements, a first conductive path, and a second conductive path of a second power storage unit from the bottom 下から２層目の蓄電ユニットの第１導電路を示す斜視図The perspective view which shows the 1st conductive path of the electrical storage unit of the 2nd layer from the bottom 下から２層目の蓄電ユニットの第１導電路を示す平面図The top view which shows the 1st conductive path of the electrical storage unit of the 2nd layer from the bottom
　＜実施形態１＞
　実施形態１を図１ないし図２０を参照して説明する。
　本実施形態の蓄電モジュール１０は、例えば自動車等の車両のＩｎｔｅｇｒａｔｅｄ　Ｓｔａｒｔｅｒ　Ｇｅｎｅｒａｔｏｒ（ＩＳＧ）に用いられる。以下では、図１４の下方を前方、上方を後方とし、図１４の左方を左方、右方を右方とし、蓄電ユニット２２Ａ～２２Ｆの積層方向を上方、反対側を下方として説明する。 <Embodiment 1>
A first embodiment will be described with reference to FIGS.
The power storage module 10 according to the present embodiment is used for an integrated starter generator (ISG) of a vehicle such as an automobile. In the following description, it is assumed that the lower side of FIG. 14 is the front, the upper side is the rear, the left side of FIG. 14 is the left side, the right side is the right side, and the stacking direction of the power storage units 22A to 22F is the upper side.
　（蓄電モジュール１０）
　蓄電モジュール１０は、図１に示すように、全体として略直方体形状をなしており、略直方体状のケース１１に複数の蓄電ユニット２２Ａ～２２Ｆが積層されて構成された積層体２１が収容されており、積層体２１の端子３０，３２がケース１１を貫通して外部に導出されている。 (Power storage module 10)
As shown in FIG. 1, the power storage module 10 has a substantially rectangular parallelepiped shape as a whole, and a stacked body 21 configured by stacking a plurality of power storage units 22A to 22F in a substantially rectangular parallelepiped case 11 is accommodated. The terminals 30 and 32 of the laminate 21 are led out through the case 11.
（ケース１１）
　ケース１１は、積層体２１が内部に配される筒状のケース本体１２と、ケース本体１２の左右の開口部１４を閉塞する閉塞部材１９とを備えている。
　ケース本体１２は、金属製であって、積層体２１が収容される箱形のロアケース１３と、ロアケース１３の上方を覆うアッパーケース１５とを備えている。 (Case 11)
The case 11 includes a cylindrical case body 12 in which the laminated body 21 is disposed, and a closing member 19 that closes the left and right openings 14 of the case body 12.
The case body 12 is made of metal, and includes a box-shaped lower case 13 in which the stacked body 21 is accommodated, and an upper case 15 that covers the lower case 13.
　ロアケース１３は、上方及び前方が開放されるとともに後方の一部が開放されている。
　ロアケース１３の底面の周縁部には、積層体２１を貫通させたボルト１７Ａを貫通して締結するための留め孔（図示しない）が貫通形成されている。 The lower case 13 is open at the top and front and partly open at the rear.
A fastening hole (not shown) for penetrating and fastening the bolt 17 </ b> A through which the laminated body 21 is penetrated is formed in the peripheral edge portion of the bottom surface of the lower case 13.
　アッパーケース１５は、略長方形状であって、その中央部には、ケース１１の内方側に段差状に陥没する放熱面１６が形成されており、この放熱面１６の内面が最上層の蓄電ユニット２２Ｆにおける蓄電素子２３～２５と接触することで蓄電素子２３～２５の熱が放熱面１６を介して外部に放散される。 The upper case 15 has a substantially rectangular shape, and a heat radiating surface 16 that is recessed in a step shape is formed on the inner side of the case 11, and the inner surface of the heat radiating surface 16 is the uppermost power storage layer. By contacting the power storage elements 23 to 25 in the unit 22F, the heat of the power storage elements 23 to 25 is dissipated to the outside through the heat radiation surface 16.
　アッパーケース１５の周縁部には、ボルト１７Ａとナット１７Ｂで締結するための留め孔が貫通形成されている。
　また、アッパーケース１５の前端部には、閉塞部材１９を係止するための係止孔１８が形成されている。 A fastening hole for fastening with a bolt 17 </ b> A and a nut 17 </ b> B is formed through the periphery of the upper case 15.
A locking hole 18 for locking the closing member 19 is formed at the front end of the upper case 15.
　閉塞部材１９は、合成樹脂製であって、ケース１１の左右の開口部１４に嵌め入られる形状であり、左方側の閉塞部材１９（右方の閉塞部材は図示しない）には、端子３０，３２をケース１１の外部に導出する端子導出口２０が形成されている。閉塞部材１９の上面には、係止孔１８に嵌め入れられる係止凸部が形成されている。 The closing member 19 is made of synthetic resin and has a shape that fits into the left and right openings 14 of the case 11. The left side closing member 19 (the right closing member is not shown) has a terminal 30. , 32 are led out to the outside of the case 11. On the upper surface of the closing member 19, a locking projection that is fitted into the locking hole 18 is formed.
（積層体２１）
　積層体２１は、図２に示すように、複数層（本実施形態では６層）の蓄電ユニット２２Ａ～２２Ｆを上下に積み重ねて構成されている。
（蓄電ユニット２２Ａ～２２Ｆ）
　各蓄電ユニット２２Ａ～２２Ｆは、上下に隣り合う蓄電ユニット２２Ａ～２２Ｆの前後の向きが反対になるように重ねられており、共に、正極及び負極の端子２７Ａ，２７Ｂを有する複数の蓄電素子２３～２５と、蓄電素子２３～２５の正極の端子２７Ａと電気的に接続される第１端子部２９と、蓄電素子２３～２５の負極の端子２７Ｂと電気的に接続される第２端子部３１と、第１端子部２９と各蓄電素子２３～２５の各正極の端子２７Ａとを並列に接続する第１導電路３３と、第２端子部３１と各蓄電素子２３～２５の各負極の端子２７Ｂとを並列に接続する第２導電路３８と、複数の蓄電素子２３～２５を保持する合成樹脂製の保持部材４３と、蓄電素子２３～２５の底面に沿うように配され、蓄電素子２３～２５の熱を外部に放散させる板状の放熱部材５２とを備える。 (Laminate 21)
As shown in FIG. 2, the stacked body 21 is configured by stacking a plurality of layers (six layers in this embodiment) of power storage units 22A to 22F vertically.
(Electric storage units 22A to 22F)
The power storage units 22A to 22F are stacked so that the front and rear directions of the power storage units 22A to 22F adjacent to each other in the vertical direction are opposite to each other. 25, a first terminal portion 29 electrically connected to the positive terminal 27A of the storage elements 23 to 25, and a second terminal portion 31 electrically connected to the negative terminal 27B of the storage elements 23 to 25. The first conductive path 33 connecting the first terminal portion 29 and the positive terminal 27A of each of the storage elements 23-25 in parallel, and the negative terminal 27B of the second terminal portion 31 and each of the storage elements 23-25. Are arranged along the bottom surfaces of the storage elements 23 to 25, the second conductive path 38 that connects the storage elements 23 to 25 in parallel, the synthetic resin holding member 43 that holds the plurality of storage elements 23 to 25, and the storage elements 23 to 25. Dissipate 25 heat to the outside That comprises a plate-shaped heat radiating member 52.
　複数の蓄電素子２３～２５は、共に、同一構成であり、図４に示すように、扁平な形状のラミネート型の電池である。
　各蓄電素子２３～２５は、上下のラミネートフィルム内に図示しない蓄電要素が収容されて端部が溶着された本体２６と、ラミネートフィルムの端部から外方に突出する正極及び負極の端子２７Ａ，２７Ｂ（リード端子）とを有する。 The plurality of power storage elements 23 to 25 have the same configuration, and are flat-type laminate-type batteries as shown in FIG.
Each of the power storage elements 23 to 25 includes a main body 26 in which power storage elements (not shown) are accommodated in upper and lower laminate films and welded at the ends, and positive and negative terminals 27A protruding outward from the end portions of the laminate film, 27B (lead terminal).
　ラミネートフィルムは、金属箔の外側に樹脂層を積層している。金属箔としてはアルミニウム箔等があげられ、樹脂層としては、ポリエチレンテレフタレート、ナイロン等があげられる。金属箔の内側（蓄電要素側）には、ポリエチレンまたはポリプロピレン等からなる熱溶着層が設けられている。
　ラミネートフィルムの溶着された側端部２８は、本体２６側に折り曲げられている。 The laminate film has a resin layer laminated on the outside of the metal foil. Examples of the metal foil include aluminum foil, and examples of the resin layer include polyethylene terephthalate and nylon. A heat welding layer made of polyethylene, polypropylene, or the like is provided inside the metal foil (on the electricity storage element side).
The side end portion 28 to which the laminate film is welded is bent toward the main body 26 side.
　一対の端子２７Ａ，２７Ｂは、下側のラミネートフィルムの上面に重なるように上下のラミネートフィルムの間から本体２６の外部に導出されている。
　複数の蓄電素子２３～２５は、同一平面上に（扁平な面に沿うように）左右に一列に並べられて蓄電素子列を形成している。
　隣り合う蓄電素子２３～２５の間はわずかな隙間を有している。 The pair of terminals 27 </ b> A and 27 </ b> B are led out of the main body 26 from between the upper and lower laminate films so as to overlap the upper surface of the lower laminate film.
The plurality of power storage elements 23 to 25 are arranged in a line on the left and right on the same plane (along a flat surface) to form a power storage element array.
There is a slight gap between the adjacent power storage elements 23 to 25.
　第１端子部２９は、最下層の蓄電ユニット２２Ａについては、図３に示すように、蓄電モジュール１０の全体の正極の端子３０とされ、外部の電線端末の端子（図示しない）に接続される。他の層（２～６層）の蓄電ユニット２２Ｂ～２２Ｆの第１端子部２９は上下に隣り合う蓄電ユニット２２Ａ～２２Ｅの第２端子部３１と接続される。なお、異なる層の第１端子部２９と第２端子部３１との接続は、図１５に示すように、薄肉の金属板（銅板等）をクランク状に曲げて形成した接続端子５５を第１端子部２９及び第２端子部３１の双方に超音波溶接することにより、異なる層の第１端子部２９と第２端子部３１とが接続されている。 As shown in FIG. 3, the first terminal portion 29 is the positive electrode terminal 30 of the entire power storage module 10 and is connected to a terminal (not shown) of an external electric wire terminal, as shown in FIG. . First terminal portions 29 of power storage units 22B to 22F of other layers (2 to 6 layers) are connected to second terminal portions 31 of power storage units 22A to 22E that are vertically adjacent. In addition, as shown in FIG. 15, the connection between the first terminal portion 29 and the second terminal portion 31 of different layers is a first connection terminal 55 formed by bending a thin metal plate (copper plate or the like) into a crank shape. The first terminal portion 29 and the second terminal portion 31 of different layers are connected by ultrasonic welding to both the terminal portion 29 and the second terminal portion 31.
　第２端子部３１は、１～５層の蓄電ユニット２２Ａ～２２Ｅについては、２～６層の蓄電ユニット２２Ｂ～２２Ｆの第１端子部２９と接続される。なお、最上層の蓄電ユニット２２Ｆの第２端子部３１は、図２に示すように、蓄電モジュール１０の全体の負極の端子３２とされ、外部の電線端末の端子（図示しない）に接続される。 The second terminal unit 31 is connected to the first terminal unit 29 of the second to sixth layers of power storage units 22B to 22F for the first to fifth layers of power storage units 22A to 22E. As shown in FIG. 2, the second terminal portion 31 of the uppermost power storage unit 22F is the negative terminal 32 of the entire power storage module 10, and is connected to a terminal (not shown) of an external electric wire terminal. .
　第１端子部２９と第２端子部３１の間は、図８に示すように、第１導電路３３，蓄電素子２３～２５，第２導電路３８によって接続されており、これにより、蓄電素子２３～２５の数に応じた複数（本実施形態では３つ）の分流経路が形成されている（図８では、導電路の長い分岐路には他の分岐路よりも余分に長さに応じた抵抗ＲＡ１，ＲＡ２，ＲＢ１，ＲＢ２が生じている）。
　図５に示すように、第１導電路３３及び第２導電路３８は、金属板材をプレスにより打ち抜いて曲げ加工を施して形成したものであり、例えば、純アルミ、アルミ合金、銅または銅合金などの導電性材料からなる。
　以下では、蓄電ユニット２２Ａ～２２Ｆの第１導電路３３及び第２導電路３８について、下側の１，２層の蓄電ユニット２２Ａ，２２Ｂの第１導電路３３Ａ，３３Ｂ及び第２導電路３８Ａ（第２導電路は１，２層は同一形状）について説明し、他の３～６層の蓄電ユニット２２Ｃ～２２Ｆの第１導電路３３及び第２導電路３８についての説明は省略する。 As shown in FIG. 8, the first terminal portion 29 and the second terminal portion 31 are connected by a first conductive path 33, power storage elements 23 to 25, and a second conductive path 38. A plurality of (three in this embodiment) shunt paths corresponding to the number of 23 to 25 are formed (in FIG. 8, the length of the conductive path is longer than the other branch paths depending on the length). Resistors RA1, RA2, RB1, and RB2 are generated).
As shown in FIG. 5, the first conductive path 33 and the second conductive path 38 are formed by punching a metal plate material and bending it, for example, pure aluminum, aluminum alloy, copper or copper alloy. It consists of conductive materials such as.
Hereinafter, for the first conductive path 33 and the second conductive path 38 of the power storage units 22A to 22F, the first conductive paths 33A and 33B and the second conductive path 38A of the lower and second power storage units 22A and 22B ( The second conductive path has the same shape for the first and second layers), and the description of the first conductive path 33 and the second conductive path 38 of the other three to six layers of power storage units 22C to 22F is omitted.
　蓄電ユニット２２Ａの第１導電路３３Ａは、図１０に示すように、第１端子部２９と、第１端子部２９と一体に形成され、第１端子部２９に連なる平板状の第１導電路本体３５とを有し、第１導電路本体３５は、第１端子部２９と各蓄電素子２３～２５の各正極の端子２７Ａとを並列に接続するように分岐された複数の第１分岐路３４Ａ～３４Ｃを有する。 As shown in FIG. 10, the first conductive path 33 </ b> A of the power storage unit 22 </ b> A is formed integrally with the first terminal portion 29 and the first terminal portion 29, and is a flat plate-shaped first conductive path that is continuous with the first terminal portion 29. The first conductive path body 35 includes a plurality of first branch paths branched so as to connect the first terminal portion 29 and the positive terminals 27A of the power storage elements 23 to 25 in parallel. 34A to 34C.
　第１端子部２９は、第１導電路本体３５の端部がクランク状に屈曲されることで、第１導電路本体３５とは異なる高さに形成されている。
　第１導電路本体３５は、第１端子部２９から蓄電素子２３～２５の並び方向に沿って左右に延びており、その経路上で段差状に曲げ加工された曲げ部５４によりわずかに高さが変えられ、曲げ部５４よりも先には、延出方向の一方の側縁部に蓄電素子２３～２５の各正極の端子２７Ａに接続される接続部３６Ａ～３６Ｃが形成されている。 The first terminal portion 29 is formed at a height different from that of the first conductive path main body 35 by bending the end portion of the first conductive path main body 35 into a crank shape.
The first conductive path main body 35 extends from the first terminal portion 29 to the left and right along the direction in which the power storage elements 23 to 25 are arranged, and is slightly raised by a bent portion 54 that is bent in a step shape on the path. The connecting portions 36A to 36C connected to the positive terminals 27A of the power storage elements 23 to 25 are formed at one side edge in the extending direction before the bent portion 54.
　第１分岐路３４Ａは、第１導電路本体３５の電流が分流する接続部３６Ａの部分であり、第１分岐路３４Ｂは、接続部３６Ａの右端側から第１導電路本体３５の電流が分流する接続部３６Ｂまでの部分であり、第１分岐路３４Ｃは、接続部３６Ｂの右端側から接続部３６Ｃまでの部分である。 The first branch path 34A is a part of the connecting portion 36A where the current of the first conductive path main body 35 diverges, and the first branch path 34B is the current of the first conductive path main body 35 diverges from the right end side of the connecting portion 36A. The first branch path 34C is a part from the right end side of the connection part 36B to the connection part 36C.
　蓄電ユニット２２Ｂの第１導電路３３Ｂは、図２０に示すように、第１端子部２９と、第１端子部２９と一体に形成された第１導電路本体３５とを有し、第１導電路本体３５は、第１端子部２９と各蓄電素子２３～２５の各正極の端子２７Ａとの間を並列に接続するように分岐された複数の第１分岐路３４Ａ～３４Ｃを有する。 As shown in FIG. 20, the first conductive path 33 </ b> B of the power storage unit 22 </ b> B includes a first terminal portion 29 and a first conductive path main body 35 formed integrally with the first terminal portion 29. The path body 35 has a plurality of first branch paths 34A to 34C branched so as to connect the first terminal portion 29 and the positive terminals 27A of the respective storage elements 23 to 25 in parallel.
　蓄電ユニット２２Ｂの第１導電路本体３５は、第１端子部２９から後方に延びているとともに、その後端部から直角に屈曲され、蓄電素子２３～２５の並び方向に沿って左右に延びており、その延出方向の一方の側縁部に蓄電素子２３～２５の端子２７Ａに接続される接続部３６Ａ～３６Ｃが形成されている。 The first conductive path main body 35 of the power storage unit 22B extends rearward from the first terminal portion 29, is bent at a right angle from the rear end portion thereof, and extends left and right along the direction in which the power storage elements 23 to 25 are arranged. Connection portions 36A to 36C connected to the terminals 27A of the storage elements 23 to 25 are formed on one side edge portion in the extending direction.
　第１分岐路３４Ａは、第１導電路本体３５の電流が分流する接続部３６Ａの部分であり、第１分岐路３４Ｂは、接続部３６Ａの左端側から第１導電路本体３５の電流が分流する接続部３６Ｂまでの部分であり、第１分岐路３４Ｃは、接続部３６Ｂの左端側から接続部３６Ｃまでの部分である。
　蓄電ユニット２２Ａ，２２Ｂの第１導電路３３の上面のうち、蓄電素子２３～２５に沿って延びる所定の範囲（第２導電路３８が下に重なる領域）には、他の部材から第１導電路３３を絶縁するための図示しない絶縁シート（絶縁部材）が貼り付けられている。 The first branch path 34A is a part of the connecting portion 36A where the current of the first conductive path main body 35 is shunted, and the first branch path 34B is the current of the first conductive path main body 35 shunted from the left end side of the connecting portion 36A. The first branch path 34C is a part from the left end side of the connection part 36B to the connection part 36C.
Among the upper surfaces of the first conductive paths 33 of the power storage units 22A and 22B, a predetermined range extending along the power storage elements 23 to 25 (a region where the second conductive path 38 overlaps) is provided from other members to the first conductive path 33. An insulating sheet (insulating member) (not shown) for insulating the path 33 is attached.
　第２導電路３８は、図１２に示すように、第２端子部３１と、第２端子部３１と一体に形成された第２導電路本体４０とを有し、第２導電路本体４０は、第２端子部３１と各蓄電素子２３～２５の各負極の端子２７Ｂとを並列に接続するように分岐された複数の第２分岐路３９Ａ～３９Ｃを有する。
　第２導電路本体４０は、第２端子部３１から蓄電素子２３～２５の並び方向に沿って左右に延びる部分を有し、その延出方向の一方の側縁部に蓄電素子２３～２５の負極の端子２７Ｂに接続される接続部４１Ａ～４１Ｃが形成されている。 As shown in FIG. 12, the second conductive path 38 includes a second terminal portion 31 and a second conductive path main body 40 formed integrally with the second terminal portion 31, and the second conductive path main body 40 is The second terminal section 31 and a plurality of second branch paths 39A to 39C branched so as to connect the negative terminal 27B of each of the storage elements 23 to 25 in parallel.
The second conductive path main body 40 has a portion extending left and right along the direction in which the power storage elements 23 to 25 are arranged from the second terminal portion 31, and the power storage elements 23 to 25 are disposed on one side edge in the extending direction. Connection portions 41A to 41C connected to the negative terminal 27B are formed.
　第２分岐路３９Ａは、第２導電路本体４０の電流が分流する接続部４１Ａの部分であり、第２分岐路３９Ｂは、接続部４１Ａの左端側から第２導電路本体４０の電流が分流する接続部４１Ｂまでの部分であり、第２分岐路３９Ｃは、接続部４１Ｂの左端側から接続部４１Ｃまでの部分である。 The second branch path 39A is a part of the connecting portion 41A where the current of the second conductive path main body 40 is shunted, and the second branch path 39B is the current of the second conductive path main body 40 is shunted from the left end side of the connecting portion 41A. The second branch path 39C is a part from the left end side of the connection part 41B to the connection part 41C.
　第２導電路３８の上面のうち、蓄電素子２３～２５に沿って延びる所定の範囲（第１導電路３３が上に重なる領域）には、第１導電路３３との間を絶縁するための図示しない絶縁シート（絶縁部材）が貼り付けられている。
　これにより、複数の第１分岐路３４Ａ～３４Ｃのうち最も抵抗が大きい第１分岐路３４Ｃに正極の端子２７Ａが接続された蓄電素子２５の負極の端子２７Ｂに接続される第２分岐路３９Ａは、最も抵抗が小さくなっている。
　なお、導電路３３，３８には、上方に積層される蓄電ユニット２２Ｂ～２２Ｆを保持する保持爪５３が形成されている。 Of the upper surface of the second conductive path 38, a predetermined range extending along the power storage elements 23 to 25 (region where the first conductive path 33 overlaps) is used to insulate the first conductive path 33 from the first conductive path 33. An insulating sheet (insulating member) not shown is attached.
As a result, the second branch path 39A connected to the negative terminal 27B of the storage element 25 in which the positive terminal 27A is connected to the first branch path 34C having the highest resistance among the plurality of first branch paths 34A to 34C is obtained. The resistance is the smallest.
The conductive paths 33 and 38 are formed with holding claws 53 that hold the power storage units 22B to 22F stacked above.
　（保持部材４３）
　保持部材４３は、合成樹脂製であって、図３に示すように、放熱部材５２の上に配される中央セパレータ４４と、放熱部材５２の左右にそれぞれ配されるサイドセパレータ４９Ａ，４９Ｂとを備え、中央セパレータ４４とサイドセパレータ４９Ａ，４９Ｂとに亘って第１導電路３３及び第２導電路３８からなるバスバーが配されて保持される。 (Holding member 43)
The holding member 43 is made of synthetic resin, and as shown in FIG. 3, a central separator 44 disposed on the heat radiating member 52 and side separators 49 </ b> A and 49 </ b> B respectively disposed on the left and right sides of the heat radiating member 52. In addition, a bus bar including the first conductive path 33 and the second conductive path 38 is disposed and held across the central separator 44 and the side separators 49A and 49B.
　中央セパレータ４４は、各蓄電素子２３～２５を内側に嵌め入れて保持するために矩形に区画された区画部４６を備えている。
　区画部４６は、蓄電素子２３～２５を左右に並べて嵌め入れることが可能である。
　区画部４６とバスバー保持部４５の間には、蓄電素子２３～２５の端子２７Ａ，２７Ｂが配されるとともに、この上には端子２７Ａ，２７Ｂを覆うように長尺のカバー５１が被せられている。
　放熱部材５２は、中央セパレータ４４及びサイドセパレータ４９Ａ，４９Ｂの大きさに応じた大きさの板状であって、例えば、アルミニウムやアルミニウム合金等の熱伝導性材料からなる。 The central separator 44 is provided with a partition section 46 that is partitioned into rectangles in order to fit and hold the power storage elements 23 to 25 inside.
The partition part 46 can be fitted with the power storage elements 23 to 25 arranged side by side.
Between the partition portion 46 and the bus bar holding portion 45, terminals 27A and 27B of the power storage elements 23 to 25 are arranged, and a long cover 51 is placed thereon so as to cover the terminals 27A and 27B. Yes.
The heat radiating member 52 has a plate shape having a size corresponding to the size of the central separator 44 and the side separators 49A and 49B, and is made of a heat conductive material such as aluminum or aluminum alloy.
　中央セパレータ４４は、その左右にサイドセパレータ４９Ａ，４９Ｂに重ねられる固定部４７が突出しており、固定部４７が中央セパレータ４４の上面に突出する被固定突部５０に嵌められて中央セパレータ４４とサイドセパレータ４９Ａ，４９Ｂとが固定される。 The central separator 44 protrudes from the left and right sides thereof with a fixing portion 47 that overlaps the side separators 49 </ b> A and 49 </ b> B. The fixing portion 47 is fitted into a fixed protrusion 50 that protrudes from the upper surface of the central separator 44. Separators 49A and 49B are fixed.
　サイドセパレータ４９Ａ，４９Ｂは、放熱部材５２の板面に沿って放熱部材５２の左右に延びており、その上面に第１導電路３３及び第２導電路３８からなるバスバーを嵌め入れて保持する。 The side separators 49A and 49B extend along the plate surface of the heat radiating member 52 to the left and right of the heat radiating member 52, and fit and hold the bus bar including the first conductive path 33 and the second conductive path 38 on the upper surface thereof.
　本実施形態によれば、以下の作用及び効果を奏する。
　本実施形態によれば、複数の蓄電素子２３～２５のうち一の蓄電素子２５と接続される第１分岐路３４Ｃが一の蓄電素子２５以外の蓄電素子２３，２４と接続される第１分岐路３４Ａ，３４Ｂよりも抵抗が大きく、一の蓄電素子２５と接続される第２分岐路３９Ａが一の蓄電素子２５以外の蓄電素子２３，２４と接続される第２分岐路３９Ｃ，３９Ｂよりも抵抗が小さくなっているため、第１導電路３３側の分流経路間の抵抗の相違を、同じ分流経路における第２導電路３８側の抵抗の相違で相殺することができる。よって、並列に接続された複数の経路の抵抗のばらつきを抑制することが可能になる。 According to this embodiment, the following operations and effects are achieved.
According to the present embodiment, the first branch path 34C connected to one power storage element 25 among the plurality of power storage elements 23 to 25 is connected to the power storage elements 23 and 24 other than the one power storage element 25. The second branch path 39A connected to one power storage element 25 and the second branch paths 39C and 39B connected to the power storage elements 23 and 24 other than the one power storage element 25 has higher resistance than the paths 34A and 34B. Since the resistance is small, the difference in resistance between the shunt paths on the first conductive path 33 side can be offset by the difference in resistance on the second conductive path 38 side in the same shunt path. Therefore, it is possible to suppress variations in resistance of a plurality of paths connected in parallel.
　また、一の蓄電素子２５と接続される第１分岐路３４Ｃは、一の蓄電素子２５以外の蓄電素子２３，２４と接続される第１分岐路３４Ａ，３４Ｂよりも長さが長く、一の蓄電素子２５と接続される第２分岐路３９Ａは、一の蓄電素子２５以外の蓄電素子２３，２４と接続される第２分岐路３９Ｃ，３９Ｂよりも長さが短い。
　このようにすれば、導電路の長さを変えれば、抵抗のばらつきを抑制できる。 The first branch path 34C connected to one power storage element 25 is longer in length than the first branch paths 34A and 34B connected to power storage elements 23 and 24 other than one power storage element 25. The second branch path 39A connected to the power storage element 25 is shorter than the second branch paths 39C and 39B connected to the power storage elements 23 and 24 other than the one power storage element 25.
In this way, variation in resistance can be suppressed by changing the length of the conductive path.
　さらに、第１導電路３３及び第２導電路３８（の少なくとも一方）は、バスバーによって形成されている。
　例えば、導電路が電線であれば、第１導電路３３や第２導電路３８を必要に応じて長さを変える等により抵抗のばらつきを抑制することが比較的容易であるが、バスバーの場合には、長さを変えることが容易ではない。本実施形態によれば、第１導電路３３及び第２導電路３８（の少なくとも一方）がバスバーによって形成されているため、第１導電路３３及び第２導電路３８の一方のみの導電路の長さを変えることが容易ではない場合であっても抵抗のばらつきを抑制できる。 Further, the first conductive path 33 and the second conductive path 38 (at least one of them) are formed by bus bars.
For example, if the conductive path is an electric wire, it is relatively easy to suppress variations in resistance by changing the length of the first conductive path 33 and the second conductive path 38 as necessary. It is not easy to change the length. According to the present embodiment, since the first conductive path 33 and the second conductive path 38 (at least one of them) are formed by the bus bar, only one of the first conductive path 33 and the second conductive path 38 is provided. Even if it is not easy to change the length, variation in resistance can be suppressed.
　また、第１導電路３３及び第２導電路３８は、共にバスバーであり、各蓄電素子２３～２５は、正極及び負極の端子２７Ａ，２７Ｂが扁平な本体２６の片側に並んで配されており、第１導電路３３と第２導電路３８とは絶縁シート（絶縁部材）を介して重ねられている。
　このようにすれば、第１導電路３３と第２導電路３８の配置の制約により重ねられる場合に、経路の抵抗のばらつきを抑制することができる。 The first conductive path 33 and the second conductive path 38 are both bus bars, and the power storage elements 23 to 25 are arranged such that the positive and negative terminals 27A and 27B are arranged on one side of the flat main body 26. The first conductive path 33 and the second conductive path 38 are overlapped via an insulating sheet (insulating member).
In this way, when the first conductive path 33 and the second conductive path 38 are overlapped due to the restriction of the arrangement, the resistance variation of the path can be suppressed.
　さらに、第１端子部２９は、複数の蓄電素子２３～２５の並び方向の一方の側に配され、第２端子部３１は、複数の蓄電素子２３～２５の並び方向の他方の側に配されている。
　このようにすれば、第１端子部２９及び第２端子部３１の位置により分岐路の抵抗にばらつきが生じやすい場合に、簡素な構成で各経路の抵抗のばらつきを抑制することが可能になる。 Further, the first terminal portion 29 is arranged on one side in the arrangement direction of the plurality of power storage elements 23 to 25, and the second terminal portion 31 is arranged on the other side in the arrangement direction of the plurality of power storage elements 23 to 25. Has been.
In this way, when the resistance of the branch path is likely to vary depending on the position of the first terminal portion 29 and the second terminal portion 31, it is possible to suppress the resistance variation of each path with a simple configuration. .
　また、蓄電ユニット２２Ａ～２２Ｆを複数備え、複数の蓄電ユニット２２Ａ～２２Ｆが直列に接続されて構成されている。
　複数の蓄電素子２３～２５を並列接続した蓄電ユニット２２Ａ～２２Ｆを複数形成し、複数の蓄電ユニット２２Ａ～２２Ｆを直列接続することで、所要の容量・電圧とすれば、万一、何らかの原因によって一つの蓄電素子２３～２５の導通が失われた場合でも、その故障分を並列接続された他の蓄電素子２３～２５により補うため、直ちに全体の導通不良には至らないという利点がある。
　本実施形態によれば、このような利点を得ることができる構成において、並列に接続された蓄電素子２３～２５の複数の経路の抵抗のばらつきを抑制することが可能になる。 Further, a plurality of power storage units 22A to 22F are provided, and a plurality of power storage units 22A to 22F are connected in series.
If a plurality of power storage units 22A to 22F in which a plurality of power storage elements 23 to 25 are connected in parallel are formed and the plurality of power storage units 22A to 22F are connected in series to obtain a required capacity and voltage, for some reason, Even when the conduction of one power storage element 23 to 25 is lost, the failure is compensated by the other power storage elements 23 to 25 connected in parallel, so that there is an advantage that the whole conduction failure does not immediately occur.
According to the present embodiment, it is possible to suppress variations in resistance of a plurality of paths of the power storage elements 23 to 25 connected in parallel in a configuration capable of obtaining such advantages.
　＜他の実施形態＞
　本発明は上記記述及び図面によって説明した実施形態に限定されるものではなく、例えば次のような実施形態も本発明の技術的範囲に含まれる。
（１）上記実施形態では、各導電路３３，３８の分岐路の長さによって一方の導電路３３の抵抗のばらつきを他方の導電路３８で相殺して経路の抵抗のばらつきを抑制することとしたが、これに限られない。例えば、分岐路の幅を変えたり、分岐路を構成する導電性材料の抵抗率を変えたりして、各経路の抵抗のばらつきを抑制するようにしてもよい。
（２）上記実施形態では、蓄電素子２３～２５が電池である例を示したが、蓄電素子２３～２５は、コンデンサなどであってもよい。
（３）上記実施形態では、ＩＳＧ用の蓄電モジュール１０としたが、他の用途の蓄電モジュールに用いてもよい。
（４）蓄電ユニット２２Ａ～２２Ｆに電圧検知線を接続して蓄電素子２３～２５の電圧を検知するようにしてもよい。例えば、第１導電路３３及び第２導電路３８に電圧検知端子を接続し、この電圧検知端子に接続された電線が外部に導出されるようにしてもよい。 <Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In the above embodiment, the variation in resistance of one conductive path 33 is canceled by the other conductive path 38 by the length of the branch path of each conductive path 33, 38, thereby suppressing variation in resistance of the path. However, it is not limited to this. For example, the resistance variation of each path may be suppressed by changing the width of the branch path or changing the resistivity of the conductive material constituting the branch path.
(2) In the above embodiment, the power storage elements 23 to 25 are batteries. However, the power storage elements 23 to 25 may be capacitors.
(3) In the above embodiment, the ISG power storage module 10 is used, but the power storage module may be used for other purposes.
(4) A voltage detection line may be connected to the power storage units 22A to 22F to detect the voltages of the power storage elements 23 to 25. For example, a voltage detection terminal may be connected to the first conductive path 33 and the second conductive path 38, and an electric wire connected to the voltage detection terminal may be led out to the outside.
１０：蓄電モジュール
２１：積層体
２２Ａ～２２Ｆ：蓄電ユニット
２３～２５：蓄電素子
２７Ａ：正極の端子
２７Ｂ：負極の端子
２９：第１端子部
３０：＋端子
３１：第２端子部
３２：－端子
３３（３３Ａ，３３Ｂ）：第１導電路
３４Ａ～３４Ｃ：第１分岐路
３８（３８Ａ）：第２導電路
３９Ａ～３９Ｃ：第２分岐路
４３：保持部材
５２：放熱部材 10: power storage module 21: laminates 22A to 22F: power storage units 23 to 25: power storage element 27A: positive terminal 27B: negative terminal 29: first terminal section 30: + terminal 31: second terminal section 32: -terminal 33 (33A, 33B): first conductive paths 34A to 34C: first branch path 38 (38A): second conductive paths 39A to 39C: second branch path 43: holding member 52: heat dissipation member

Claims (6)

  1. 扁平な形状であって、扁平な面に沿う方向に並んで配された正極及び負極の端子を有する複数の蓄電素子と、
    　前記蓄電素子の正極の端子と電気的に接続される第１端子部と、
    　前記蓄電素子の負極の端子と電気的に接続される第２端子部と、
    　前記第１端子部と各前記蓄電素子の各前記正極の端子とを並列に接続するように分岐された複数の第１分岐路を有する第１導電路と、
    　前記第２端子部と各前記蓄電素子の各前記負極の端子とを並列に接続するように分岐された複数の第２分岐路を有する第２導電路と、を備え、
    　前記複数の蓄電素子のうち一の蓄電素子と接続される前記第１分岐路が前記一の蓄電素子以外の蓄電素子と接続される前記第１分岐路よりも抵抗が大きく、前記一の蓄電素子と接続される前記第２分岐路が前記一の蓄電素子以外の蓄電素子と接続される前記第２分岐路よりも抵抗が小さい蓄電ユニット。     A plurality of power storage elements having positive and negative terminals that are flat and arranged in a direction along the flat surface;
    A first terminal portion electrically connected to a positive electrode terminal of the power storage element;
    A second terminal portion electrically connected to a negative electrode terminal of the energy storage device;
    A first conductive path having a plurality of first branch paths branched so as to connect the first terminal portion and the positive electrode terminal of each power storage element in parallel;
    A second conductive path having a plurality of second branch paths branched so as to connect the second terminal portion and the negative electrode terminals of the power storage elements in parallel;
    Among the plurality of power storage elements, the first branch path connected to one power storage element has a larger resistance than the first branch path connected to a power storage element other than the one power storage element, and the one power storage element A power storage unit having a resistance smaller than that of the second branch path connected to a power storage element other than the one power storage element.
  2. 前記一の蓄電素子と接続される前記第１分岐路は、前記一の蓄電素子以外の蓄電素子と接続される前記第１分岐路よりも長さが長く、前記一の蓄電素子と接続される前記第２分岐路は、前記一の蓄電素子以外の蓄電素子と接続される前記第２分岐路よりも長さが短い請求項１に記載の蓄電ユニット。 The first branch path connected to the one power storage element is longer than the first branch path connected to a power storage element other than the one power storage element, and is connected to the one power storage element. The power storage unit according to claim 1, wherein the second branch path is shorter in length than the second branch path connected to a power storage element other than the one power storage element.
  3. 前記第１導電路及び前記第２導電路の少なくとも一方は、バスバーによって形成されている請求項１又は請求項２に記載の蓄電ユニット。 The power storage unit according to claim 1 or 2, wherein at least one of the first conductive path and the second conductive path is formed by a bus bar.
  4. 前記第１導電路及び前記第２導電路は、共にバスバーであり、
    前記各蓄電素子は、前記正極及び負極の端子が扁平な本体の片側に並んで配されており、
    　前記第１導電路と前記第２導電路とは絶縁部材を介して重ねられている請求項３に記載の蓄電ユニット。     The first conductive path and the second conductive path are both bus bars,
    Each of the power storage elements, the positive and negative terminals are arranged side by side on a flat main body,
    The power storage unit according to claim 3, wherein the first conductive path and the second conductive path are overlapped via an insulating member.
  5. 前記第１端子部は、前記複数の蓄電素子の並び方向の一方の側に配され、前記第２端子部は、前記複数の蓄電素子の並び方向の他方の側に配されている請求項１ないし請求項４のいずれか一項に記載の蓄電ユニット。 The first terminal portion is arranged on one side of the arrangement direction of the plurality of power storage elements, and the second terminal portion is arranged on the other side of the arrangement direction of the plurality of power storage elements. The power storage unit according to any one of claims 4 to 4.
  6. 請求項１ないし請求項５のいずれか一項に記載の蓄電ユニットを複数備え、
    　前記複数の蓄電ユニットが直列に接続されて構成されている蓄電モジュール。     A plurality of power storage units according to any one of claims 1 to 5,
    A power storage module comprising the plurality of power storage units connected in series.
PCT/JP2013/084206 2013-02-26 2013-12-20 Electricity storage unit and electricity storage module WO2014132536A1 (en)

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