WO2016199563A1 - Battery module - Google Patents

Battery module Download PDF

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Publication number
WO2016199563A1
WO2016199563A1 PCT/JP2016/065109 JP2016065109W WO2016199563A1 WO 2016199563 A1 WO2016199563 A1 WO 2016199563A1 JP 2016065109 W JP2016065109 W JP 2016065109W WO 2016199563 A1 WO2016199563 A1 WO 2016199563A1
Authority
WO
WIPO (PCT)
Prior art keywords
battery
battery cell
external terminal
pair
electrode external
Prior art date
Application number
PCT/JP2016/065109
Other languages
French (fr)
Japanese (ja)
Inventor
貴支 鈴木
大矢　淳
直樹 小島
倫弘 木村
Original Assignee
日立オートモティブシステムズ株式会社
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 日立オートモティブシステムズ株式会社 filed Critical 日立オートモティブシステムズ株式会社
Priority to JP2017523179A priority Critical patent/JP6494754B2/en
Publication of WO2016199563A1 publication Critical patent/WO2016199563A1/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
    • 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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/613—Cooling or keeping cold
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/615—Heating or keeping warm
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/64—Heating or cooling; Temperature control characterised by the shape of the cells
    • H01M10/647—Prismatic or flat cells, e.g. pouch cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6554—Rods or 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
    • H01M50/262—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders with fastening means, e.g. locks
    • H01M50/264—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders with fastening means, e.g. locks for cells or batteries, e.g. straps, tie rods or peripheral frames
    • 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
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
    • 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
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch 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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/658—Means for temperature control structurally associated with the cells by thermal insulation or shielding
    • 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
    • H01M50/271—Lids or covers for the racks or secondary casings
    • 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
    • H01M50/289—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by spacing elements or positioning means within frames, racks or packs
    • 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 is a battery module mainly used as a power source for a hybrid vehicle or an electric vehicle using a motor as a drive source, and is a battery cell stack in which cell terminal surfaces of a plurality of rectangular secondary battery cells are stacked on one surface.
  • the present invention relates to a battery module having a structure in which a body is connected by providing end plates at both ends.
  • the battery cell and the battery stack are configured to prevent the battery cell from being broken due to vibration and shock, and to prevent the internal parts and the connection between the battery cells from being broken. It is necessary to suppress it. Moreover, in the case of a lithium ion battery, since an electrode expand
  • Patent Document 1 a battery cell stack in which a holder is disposed between battery cells, a pair of end plates disposed at both ends thereof, and a connection member fixed to each of the pair of end plates and engaging with the holder
  • Patent Document 1 a structure in which a holder is disposed between battery cells, a pair of end plates disposed at both ends thereof, and a connection member fixed to each of the pair of end plates and engaging with the holder
  • the holders arranged between the battery cells described in Patent Document 1 are provided with a battery cell and an end in order to suppress the movement of the position restriction in the three directions of the battery cells and the relative displacement between the battery cells.
  • a holding shape for engaging with the plate and a protrusion for engaging with the connecting member are provided, and the shape is complicated.
  • almost the same number of resin molded products having complicated shapes as the battery cells are used. Therefore, there is a problem that the number of parts increases and the entire manufacturing cost including the number of assembly steps increases.
  • the present invention has been made in view of the above points, and the object of the present invention is to achieve the restriction of the movement of the battery cells in three directions and the relative displacement between the battery cells with a simple configuration.
  • a battery module is provided.
  • the battery module of the present invention that solves the above problems is a battery cell in which a plurality of rectangular battery cells each having a positive electrode external terminal and a negative electrode external terminal are stacked in one direction so that the one surface faces the same direction.
  • Each of the pair of clamping members of the first lashing portion and the pair of the second lashing portions Each of the holding members is fixed, and the second tying portion is arranged so that the positions of the plurality of battery cells are at least in the stacking direction of the battery cell stack and at right angles to the stacking direction. It has a position restricting means that restricts from the direction. .
  • the external appearance perspective view of a battery cell The external appearance perspective view of a battery cell laminated body.
  • FIG. 6 is an enlarged cross-sectional view taken along line VI-VI in FIG. 4.
  • the external appearance perspective view of a battery module. The exploded perspective view of a battery module.
  • the enlarged top view of FIG. The external appearance perspective view of the battery module which attached the cover.
  • Embodiment 1 of the battery module according to the present invention will be described with reference to the drawings.
  • the case where the battery module is used as a drive source for an electric vehicle or a hybrid electric vehicle will be described as an example.
  • the application is not limited to the vehicle use.
  • FIG. 1 is an external perspective view of a battery cell.
  • the battery cell 1 is a square lithium ion secondary battery, and an electrode group having a positive electrode and a negative electrode is housed in a battery container made of an aluminum alloy together with a non-aqueous electrolyte.
  • the battery container of the battery cell 1 has a bottomed battery can 1a and a battery lid 1b that seals the opening of the battery can 1a.
  • the battery can 1a is a flat rectangular container formed by deep drawing, and includes a rectangular bottom surface PB, a pair of wide side surfaces PW rising from the long side portion of the bottom surface PB, and a pair of rising surfaces from the short side portion of the bottom surface PB. It has a narrow side surface PN.
  • the three directions in the description of the present embodiment are the X direction as the direction toward the narrow side surface PN of the battery cell 1, the Y direction as the direction toward the wide side surface PW of the battery cell 1, and the upper surface PU and the bottom surface PB of the battery cell 1.
  • the direction toward is denoted as the Z direction.
  • the battery lid 1b is composed of a rectangular flat plate member and has an upper surface PU.
  • the battery lid 1b is provided with a positive external terminal 1c and a negative external terminal 1d for inputting and outputting voltage.
  • the positive electrode external terminal 1c and the negative electrode external terminal 1d are arranged at positions separated from each other in the long side direction of the battery lid 1b.
  • the positive external terminal 1c and the negative external terminal 1d protrude from the battery cover 1b on the upper surface PU side, and nut fastening bolts for fastening the bus bars are provided.
  • a resin gasket 1g is interposed between the positive external terminal 1c and the battery cover 1b, and between the negative external terminal 1d and the battery cover 1b, and is insulated.
  • the gasket 1g has a size that protrudes laterally from the outer edges of the positive electrode external terminal 1c and the negative electrode external terminal 1d along the upper surface of the battery lid 1b.
  • the battery lid 1b after accommodating the electrode group in the battery can 1a, is laser welded to the battery can 1a to seal the opening of the battery can 1a.
  • a gas discharge valve 1e that cleaves due to an increase in internal pressure and discharges gas in the battery container is provided at a position closer to the center of the battery cover 1b, which is an intermediate position in the long side direction of the battery cover 1b.
  • the battery cell 1 is entirely covered with an insulating film 1f except for the positive electrode external terminal 1c, the negative electrode external terminal 1d, and the gas discharge valve 1e.
  • FIG. 2 is an external perspective view of the battery cell stack 2
  • FIG. 3 is an exploded perspective view showing a state in which a part of the battery cell stack is disassembled.
  • the battery cell stack 2 is configured by stacking a plurality of battery cells 1 side by side.
  • the plurality of battery cells 1 are arranged such that the positive electrode external terminals 1c and the negative electrode external terminals 1d are alternately continuous along the stacking direction.
  • a pair of end plates 3 are disposed at both ends in the stacking direction of the plurality of battery cells 1.
  • the pair of end plates 3 constitutes a first securing portion as a pair of clamping members.
  • Female screws 3 a and 3 b are screwed on the outer surface (for example, the upper surface and the wide side surface) of the end plate 3.
  • the female screw 3 a is formed on the upper surface of the end plate 3, and the female screw 3 b is formed on the wide surface of the end plate 3.
  • inter-cell spacer 4 is interposed between each battery cell 1 and the end plate 3.
  • the inter-cell spacer 4 is intended to insulate and insulate the battery cells 1 and is not necessarily limited to being provided as long as the purpose is achieved. Further, the inter-cell spacer 4 may be simply interposed between each battery cell 1 and the end plate 3, or may be fixed by adhesion (for example, double-sided tape or adhesive).
  • FIG. 4 is an external perspective view of the battery block 5
  • FIG. 5 is an exploded perspective view showing a state in which a part of the battery block 5 is disassembled.
  • the battery block 5 includes an upper plate 6 on the upper surface side of the battery cell laminate 2 and a lower plate 7 on the bottom surface side.
  • the upper plate 6 is made of a resin material
  • the lower plate 7 is formed by bending a metal plate.
  • the upper plate 6 and the lower plate 7 constitute a second securing portion as a pair of sandwiching members disposed on the upper surface side and the can bottom side in the battery cell stack 2.
  • the battery cell stack 2 is pressed in the stacking direction, and when the predetermined size is reached, the upper plate 6 is brought into contact with the battery lid 1 b (upper surface PU) of the battery cell 1, It fixes to the internal thread 3a of each end plate 3 by screw fastening.
  • the lower plate 7 is brought into contact with the bottom surface PB of the battery cell 1 and is fixed to the female threads 3b of the end plates 3 at the both ends by screw fastening.
  • the distance between the pair of end plates 3 at both ends is kept constant in a state where a pressing force is applied to the battery cell stack 2. Therefore, the individual movement of the battery cell 1 and the movement of the battery cell stack 2 can be suppressed against the vibration and impact of the vehicle in the Y direction.
  • the upper plate 6 and the lower plate 7 are kept in contact with each of the upper surface PU and the bottom surface PB of the battery cell 1, the individual movement of the battery cell 1 against the vibration and impact of the vehicle in the Z direction The movement of the battery cell stack 2 can be suppressed.
  • the upper plate 6 is a pressing piece 6a, 6b, 6c that serves as a position restricting means for restricting the positions of the plurality of battery cells 1 from at least the stacking direction of the battery cell stack 2 and the direction perpendicular to the stacking direction and horizontal to one surface. have.
  • pressing pieces 6a, 6b, 6c are provided on the upper plate 6 so as to correspond to the positive external terminal 1c and the negative external terminal 1d protruding from the battery cell 1.
  • the pieces 6a, 6b, 6c are brought into contact with the positive external terminal 1c and the negative external terminal 1d.
  • the pressing pieces 6a, 6b, and 6c are stacked in the width direction of the stacked body, which is a direction along the battery lid 1b (one surface) with respect to the positive electrode external terminal 1c and the negative electrode external terminal 1d and perpendicular to the stacking direction of the battery cells 1. That is, it is provided so as to face the width direction of the battery cell 1.
  • the battery cell 1 moves in the stack width direction of the battery cell stack 2 in the X direction by directly contacting the gasket 1g of the positive electrode external terminal 1c and the negative electrode external terminal 1d and the narrow side surface PN of the battery cell 1. It is possible to restrict the positioning and position.
  • the pressing pieces (first pressing pieces) 6a are paired so as to be disposed to face the inner end portions of the positive electrode external terminal 1c and the negative electrode external terminal 1d of the battery cell 1 near the center in the stack width direction.
  • the battery cell 1 is positioned by being in direct contact with the gasket 1 g of the positive electrode external terminal 1 c and the negative electrode external terminal 1 d by restricting the battery cell 1 from moving in the stack width direction of the battery cell stack 2.
  • the pressing pieces (second pressing pieces) 6b are provided in pairs so as to be arranged to face the outer ends of the battery cell 1 on the outer side in the stack width direction of the positive electrode external terminal 1c and the negative electrode external terminal 1d.
  • the battery cell 1 is positioned by restricting the battery cell 1 from moving in the stack width direction of the battery cell stack 2 by directly contacting the gasket 1g of the positive electrode external terminal 1c and the negative electrode external terminal 1d.
  • the pressing pieces (third pressing pieces) 6c are provided in pairs so as to be arranged to face the narrow side surfaces PN that are the end surfaces on both sides in the stack width direction of the battery cell 1, respectively. By contacting the narrow side surface PN of 1, the battery cell 1 is positioned by restricting movement of the battery cell stack 2 in the stack width direction.
  • the pressing pieces 6a, 6b, 6c of the upper plate 6 do not necessarily need to be provided all, and may have at least one of them. In addition to positioning the battery cell 1 in the X direction by the pressing pieces 6a, 6b, 6c, the individual movement of the battery cell 1 and the movement of the battery cell stack 2 are suppressed against the vibration and impact of the vehicle in the X direction. be able to.
  • the lower plate 7 includes a bottom portion 7a that faces the bottom surface of the battery cell stack 2, a flange portion 7b that is bent at both ends in the stacking direction of the bottom portion 7a and faces the end plate 3, and a bottom portion.
  • 7 a has an edge portion 7 c that is bent at both ends in the width direction and faces the narrow side surface PN of the battery cell 1.
  • a plurality of opening holes are provided in the bottom portion 7 a so as to expose the can bottom of each battery cell 1 of the battery cell stack 2.
  • the flange portion 7 b is provided with a hole communicating with the female screw 3 b of the end plate 3 so that the end plate 3 can be screwed.
  • the edge portion 7c (fourth pressing piece) faces the narrow side surface PN of each battery cell 1 so as to be in contact with it, thereby restricting the battery cell 1 from moving in the stack width direction of the battery cell stack 2. And positioning.
  • the battery cell 1 is positioned in the X direction by the pressing pieces 6 a, 6 b, 6 c of the upper plate 6 and the edge portion 7 c of the lower plate 7. Therefore, it is not necessary to separately provide a cell holder for holding the battery cell as in the prior art, and the total number of parts can be reduced and the number of assembly steps can be reduced.
  • the upper plate 6 in the present embodiment corresponds to the gas discharge valve 1e of the battery cell 1 and is provided with a space (6i) having a uniform shape with respect to the cross section in the Y direction.
  • the upper plate 6 has a gas rail portion 6 g extending along the stacking direction at the center position in the stack width direction of the battery cell stack 2.
  • the gas rail portion 6g has a U-shaped cross section, is disposed at a position facing the gas discharge valve 1e of the battery cell 1, and communicates with the battery lid 1b of the battery cell 1 in the stacking direction.
  • a closed space 6i is formed.
  • the gas in the battery container expelled by the gas discharge valve 1e being cleaved by the increase in the internal pressure of the battery cell 1 is guided to the gas rail portion 6g communicated with the gas discharge valve 1e, and the gas rail portion 6g is closed.
  • the space 6i can flow out to a predetermined area, and can prevent outflow to an unintended area (for example, the periphery of the positive external terminal 1c and the negative external terminal 1d, parts such as a case for mounting on a vehicle not shown). it can.
  • FIG. 7 is an external perspective view of the battery module 8
  • FIG. 8 is an exploded perspective view showing a state in which a part of the battery module 8 is disassembled
  • FIG. 9 is an enlarged top view of FIG.
  • the positive electrode external terminal 1c and the negative electrode external terminal 1d of the battery cells 1 adjacent to each other in the battery block 5 are electrically connected by a plurality of bus bars 9, respectively.
  • a voltage detection line 10 for measuring the voltage of each battery cell 1 is connected to a part of the positive electrode external terminal 1 c and the negative electrode external terminal 1 d of the battery cell 1.
  • the bus bar 9 and the voltage detection line 10 are fixed by fastening nuts to bolts protruding from the positive external terminal 1c and the negative external terminal 1d.
  • the upper plate 6 is provided with a fixing hook 6e for holding the bus bar 9. According to this, since the bus bar 9 can be held on the upper plate 6 in advance, the bus bar 9 can be disposed at a predetermined position when the upper plate 6 is assembled to the battery cell stack 2. Therefore, a plurality of bus bars 9 can be easily set, and the efficiency of assembly work can be improved.
  • the upper plate 6 is provided with a partition plate 6d that partitions a plurality of voltage detection lines 10 one by one. According to this, even if the covering portion of the voltage detection line 10 is exposed due to an impact or a collision, a short circuit between the voltage detection lines 10 can be prevented. Further, the upper plate 6 is provided with a rotation preventing piece 6 f at the fastening portion of the voltage detection line 10. According to this, it can prevent that the terminal of the voltage detection wire
  • FIG. 10 is an external perspective view showing a state in which the cover 11 is attached to the upper plate 6 of the battery module 8.
  • the cover 11 is engaged with a protrusion 6 h installed on the upper plate 6.
  • the cover 11 covers the bus bar 9 and the voltage detection line 10 of the upper plate 6. By covering with the cover 11, the bus bar 9 and the voltage detection line 10 can be insulated.
  • the holding pieces 6a and 6b are provided on the upper plate 6 and the holding pieces 6a of the upper plate 6 are brought into direct contact with the gasket 1g, thereby moving the battery cell 1 in the X direction. It can be regulated and positioned. Therefore, the position of the battery cell 1 in the X direction, the Y direction, and the Z direction and the relative positions of the battery cells 1 are extremely simple with a pair of end plates 3, an upper plate 6, and a lower plate 7. Suppression of displacement movement can be achieved.
  • FIG. 11 is an embodiment in which the heat conductive sheet 12 and the heat exchanger 13 are interposed between the battery cell laminate 2 and the lower plate 7, and FIG. 12 is an exploded perspective view showing a state in which a part of FIG. 11 is disassembled. Indicates.
  • the lower plate 7 fixes the heat conductive sheet 12 and the heat exchanger 13 as heat exchanging means in a state where they are pressed against the bottom surface PB of each battery cell 1. After fixing, the bottom surface PB of each battery cell 1 and the heat exchanger 13 are thermally coupled via the heat conductive sheet 12.
  • the lower plate 7 itself may be provided with a heat exchange function (the lower plate 7 and the heat exchanger 13 may be implemented as one component). According to the above, in the battery cell 1 whose input / output performance depends on the temperature, temperature control for heating and cooling can be performed.
  • the present invention is not limited to the above-described embodiments, and various designs can be made without departing from the spirit of the present invention described in the claims. It can be changed.
  • the above-described embodiment has been described in detail for easy understanding of the present invention, and is not necessarily limited to one having all the configurations described.
  • a part of the configuration of an embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of an embodiment.

Abstract

The purpose of the present invention is to obtain a battery module with which, by a simple configuration, the battery cell positions are regulated in three directions and movement of the battery cells into offset positions relative to one another is minimized. This battery module 8 has: a battery cell stack 2 formed by stacking a plurality of square battery cells 1 having a positive electrode external terminal 1c and a negative electrode external terminal 1d provided to a battery case lid 1b; a first lashing part provided with a pair of end plates 3 arranged at both ends in the stacking direction of the battery cell stack 2; and a second lashing part provided with an upper plate 6 and a lower plate 7 which are arranged to the side of one surface of the battery cell stack 2 and to the side of a surface of the stack opposite the one surface. The pair of end plates 3 of the first lashing part and the upper plate 6 and lower plate 7 of the second lashing part are respectively fastened, and the second lashing part has a position regulating means for regulating the positions of the plurality of battery cells 1, at least in the stacking direction of the battery cell stack 2 and in a direction orthogonal to the stacking direction and horizontal to the one surface.

Description

電池モジュールBattery module
　本発明は、主として、モーターを駆動源とするハイブリッド自動車や電気自動車の電源として用いられる電池モジュールであって、複数の角形の二次電池セルのセル端子面を一面に揃えて積層した電池セル積層体を、その両端にエンドプレートを設けて連結した構成を有する電池モジュールに関する。 The present invention is a battery module mainly used as a power source for a hybrid vehicle or an electric vehicle using a motor as a drive source, and is a battery cell stack in which cell terminal surfaces of a plurality of rectangular secondary battery cells are stacked on one surface. The present invention relates to a battery module having a structure in which a body is connected by providing end plates at both ends.
　前記電池セル及び電池積層体は、振動や衝撃による電池セルに内部部品や電池セル同士の接続の破壊を防ぐため、電池セルの三方向の位置規制及び電池セル同士の相対的位置ずれの動きを抑制する必要がある。また、リチウムイオン電池の場合には、充放電時に電極が膨張し、正極と負極の間の間隔が広くなることで内部抵抗が増大し出力が低下するため、膨張を抑制する必要がある。 The battery cell and the battery stack are configured to prevent the battery cell from being broken due to vibration and shock, and to prevent the internal parts and the connection between the battery cells from being broken. It is necessary to suppress it. Moreover, in the case of a lithium ion battery, since an electrode expand | swells at the time of charging / discharging and an internal resistance increases and an output falls because the space | interval between a positive electrode and a negative electrode becomes wide, it is necessary to suppress expansion | swelling.
　例えば、電池セルと電池セルの間にホルダを配置した電池セル積層体と、その両端に配置した一対のエンドプレートと、一対のエンドプレートそれぞれに固定され、またホルダと係合する連結部材を備えた構造が知られている（特許文献１）。 For example, a battery cell stack in which a holder is disposed between battery cells, a pair of end plates disposed at both ends thereof, and a connection member fixed to each of the pair of end plates and engaging with the holder Such a structure is known (Patent Document 1).
特開２０１２－０６４３５５号公報JP 2012-064355 A
　特許文献１に記載された電池セルと電池セルの間に配置されるホルダは、電池セルの三方向の位置規制及び電池セル同士の相対的位置ずれの動きを抑制するために、電池セル及びエンドプレートに係合する保持形状や、連結部材と係合する突起が設けられており、形状が複雑になっている。そして、このように形状が複雑な樹脂成形品を、電池セルとほぼ同数用いている。したがって、部品点数が多くなり、組立工数を含む全体の製造コストが高くなるという課題がある。 The holders arranged between the battery cells described in Patent Document 1 are provided with a battery cell and an end in order to suppress the movement of the position restriction in the three directions of the battery cells and the relative displacement between the battery cells. A holding shape for engaging with the plate and a protrusion for engaging with the connecting member are provided, and the shape is complicated. In addition, almost the same number of resin molded products having complicated shapes as the battery cells are used. Therefore, there is a problem that the number of parts increases and the entire manufacturing cost including the number of assembly steps increases.
　本発明は、上記の点に鑑みてなされたものであり、その目的とするところは、簡単な構成で電池セルの三方向の位置規制及び電池セル同士の相対的位置ずれの動きの抑制を達成する電池モジュールを提供することである。 The present invention has been made in view of the above points, and the object of the present invention is to achieve the restriction of the movement of the battery cells in three directions and the relative displacement between the battery cells with a simple configuration. A battery module is provided.
　上記課題を解決する本発明の電池モジュールは、正極外部端子及び負極外部端子を一面に備えた角形の電池セルが複数、前記一面を同じ方向に面するように一方向に積層されてなる電池セル積層体と、前記電池セル積層体の積層方向の両端に配置された一対の挟持部材を備えた第１の固縛部と、前記電池セル積層体における前記一面の側及び前記一面とは反対側の面の側に配置された一対の挟持部材を備えた第２の固縛部とを有し、前記第１の固縛部の一対の挟持部材のそれぞれと前記第２の固縛部の一対の挟持部材のそれぞれとが固定され、前記第２の固縛部は、前記複数の電池セルの位置を、少なくとも前記電池セル積層体の積層方向で且つ該積層方向に直角で前記一面に水平な方向から規制する位置規制手段を有することを特徴とする。 The battery module of the present invention that solves the above problems is a battery cell in which a plurality of rectangular battery cells each having a positive electrode external terminal and a negative electrode external terminal are stacked in one direction so that the one surface faces the same direction. A laminated body, a first lashing portion including a pair of clamping members disposed at both ends in the stacking direction of the battery cell laminated body, the one surface side and the one surface opposite to the one surface in the battery cell laminated body Each of the pair of clamping members of the first lashing portion and the pair of the second lashing portions. Each of the holding members is fixed, and the second tying portion is arranged so that the positions of the plurality of battery cells are at least in the stacking direction of the battery cell stack and at right angles to the stacking direction. It has a position restricting means that restricts from the direction. .
　本発明によれば、簡単な構成で電池セルの三方向の位置規制及び電池セル同士の相対的位置ずれの動きの抑制を達成する電池モジュールを提供することができる。なお、上記した以外の課題、構成及び効果は、以下に実施形態により明らかにされる。 According to the present invention, it is possible to provide a battery module that achieves the restriction of the position of the battery cell in three directions and the movement of the relative displacement between the battery cells with a simple configuration. Problems, configurations, and effects other than those described above will be clarified by embodiments below.
電池セルの外観斜視図。The external appearance perspective view of a battery cell. 電池セル積層体の外観斜視図。The external appearance perspective view of a battery cell laminated body. 電池セル積層体の分解斜視図。The disassembled perspective view of a battery cell laminated body. 電池ブロックの外観斜視図。The external appearance perspective view of a battery block. 電池ブロックの分解斜視図。The exploded perspective view of a battery block. 図４のVI－VI線に沿う拡大断面図。FIG. 6 is an enlarged cross-sectional view taken along line VI-VI in FIG. 4. 電池モジュールの外観斜視図。The external appearance perspective view of a battery module. 電池モジュールの分解斜視図。The exploded perspective view of a battery module. 図７の拡大上面図。The enlarged top view of FIG. カバーを取り付けた電池モジュールの外観斜視図。The external appearance perspective view of the battery module which attached the cover. 熱交換機能を付与した電池モジュールの外観斜視図。The external appearance perspective view of the battery module which provided the heat exchange function. 熱交換機能を付与した電池モジュールの分解斜視図。The disassembled perspective view of the battery module which provided the heat exchange function.
＜実施形態１＞
　以下、本発明に関わる電池モジュールの実施形態１について図面に基づき説明する。なお、以下の説明では、電池モジュールが電気自動車やハイブリッド電気自動車の駆動源として用いられる車載用の場合を例に説明するが、用途は車載用に限定されるものではない。 <Embodiment 1>
Hereinafter, Embodiment 1 of the battery module according to the present invention will be described with reference to the drawings. In the following description, the case where the battery module is used as a drive source for an electric vehicle or a hybrid electric vehicle will be described as an example. However, the application is not limited to the vehicle use.
（電池セル）
　図１は、電池セルの外観斜視図である。
　電池セル１は、角形のリチウムイオン二次電池であり、アルミニウム合金製の電池容器内に、正極電極と負極電極を有する電極群が非水電解液と共に収容されている。電池セル１の電池容器は、有底の電池缶１ａと、電池缶１ａの開口部を封口する電池蓋１ｂとを有している。電池缶１ａは、深絞り加工により形成された扁平な角形容器であり、長方形の底面ＰＢと、底面ＰＢの長辺部から立ち上がる一対の幅広側面ＰＷと、底面ＰＢの短辺部から立ち上がる一対の幅狭側面ＰＮを有している。 (Battery cell)
FIG. 1 is an external perspective view of a battery cell.
The battery cell 1 is a square lithium ion secondary battery, and an electrode group having a positive electrode and a negative electrode is housed in a battery container made of an aluminum alloy together with a non-aqueous electrolyte. The battery container of the battery cell 1 has a bottomed battery can 1a and a battery lid 1b that seals the opening of the battery can 1a. The battery can 1a is a flat rectangular container formed by deep drawing, and includes a rectangular bottom surface PB, a pair of wide side surfaces PW rising from the long side portion of the bottom surface PB, and a pair of rising surfaces from the short side portion of the bottom surface PB. It has a narrow side surface PN.
　また、本実施形態の説明における三方向を、電池セル１の幅狭側面ＰＮに向かう方向をＸ方向、電池セル１の幅広側面ＰＷに向かう方向をＹ方向、電池セル１の上面ＰＵ及び底面ＰＢに向かう方向をＺ方向と表記する。 Further, the three directions in the description of the present embodiment are the X direction as the direction toward the narrow side surface PN of the battery cell 1, the Y direction as the direction toward the wide side surface PW of the battery cell 1, and the upper surface PU and the bottom surface PB of the battery cell 1. The direction toward is denoted as the Z direction.
　電池蓋１ｂは、長方形の平板部材によって構成されており、上面ＰＵを有している。電池蓋１ｂには、電圧を入出力するための正極外部端子１ｃと負極外部端子１ｄが設けられている。正極外部端子１ｃと負極外部端子１ｄは、電池蓋１ｂの長辺方向に互いに離間した位置に配置されている。正極外部端子１ｃと負極外部端子１ｄは、電池蓋１ｂに対して上面ＰＵ側に突設しており、また、それぞれバスバーを締結するためのナット締結用のボルトが突設されている。そして、正極外部端子１ｃと電池蓋１ｂとの間、及び負極外部端子１ｄと電池蓋１ｂとの間には、樹脂製のガスケット１ｇが介在されており、絶縁されている。ガスケット１ｇは、電池蓋１ｂの上面に沿って正極外部端子１ｃ及び負極外部端子１ｄの外端縁よりも側方に突出する大きさを有している。 The battery lid 1b is composed of a rectangular flat plate member and has an upper surface PU. The battery lid 1b is provided with a positive external terminal 1c and a negative external terminal 1d for inputting and outputting voltage. The positive electrode external terminal 1c and the negative electrode external terminal 1d are arranged at positions separated from each other in the long side direction of the battery lid 1b. The positive external terminal 1c and the negative external terminal 1d protrude from the battery cover 1b on the upper surface PU side, and nut fastening bolts for fastening the bus bars are provided. A resin gasket 1g is interposed between the positive external terminal 1c and the battery cover 1b, and between the negative external terminal 1d and the battery cover 1b, and is insulated. The gasket 1g has a size that protrudes laterally from the outer edges of the positive electrode external terminal 1c and the negative electrode external terminal 1d along the upper surface of the battery lid 1b.
　電池蓋１ｂは、電池缶１ａ内に電極群を収容した後に、電池缶１ａにレーザー溶接されて電池缶１ａの開口部を封口する。電池蓋１ｂの長辺方向中間位置である電池蓋１ｂ中央寄り側の位置には、内圧の上昇により開裂して電池容器内のガスを排出するガス排出弁１ｅが設けられている。電池セル１は、正極外部端子１ｃ、負極外部端子１ｄ、ガス排出弁１ｅを除く全面を絶縁性フィルム１ｆで覆われている。 The battery lid 1b, after accommodating the electrode group in the battery can 1a, is laser welded to the battery can 1a to seal the opening of the battery can 1a. A gas discharge valve 1e that cleaves due to an increase in internal pressure and discharges gas in the battery container is provided at a position closer to the center of the battery cover 1b, which is an intermediate position in the long side direction of the battery cover 1b. The battery cell 1 is entirely covered with an insulating film 1f except for the positive electrode external terminal 1c, the negative electrode external terminal 1d, and the gas discharge valve 1e.
（電池セル積層体）
　図２は、電池セル積層体２の外観斜視図、図３は、電池セル積層体の一部を分解した状態を示す分解斜視図である。 (Battery cell stack)
2 is an external perspective view of the battery cell stack 2, and FIG. 3 is an exploded perspective view showing a state in which a part of the battery cell stack is disassembled.
　電池セル積層体２は、図２及び図３に示すように、電池セル１を複数並べて積層させることによって構成されている。複数の電池セル１は、正極外部端子１ｃと負極外部端子１ｄとが積層方向に沿って交互に連続するように配置されている。複数の電池セル１の積層方向両端には、一対のエンドプレート３が配置される。一対のエンドプレート３は、一対の挟持部材として第１の固縛部を構成する。エンドプレート３の外観面（例えば、上面、幅広側面）には雌ねじ３ａ、３ｂが螺設されている。雌ねじ３ａは、エンドプレート３の上面に形成され、雌ねじ３ｂは、エンドプレート３の幅広面に形成されている。 As shown in FIGS. 2 and 3, the battery cell stack 2 is configured by stacking a plurality of battery cells 1 side by side. The plurality of battery cells 1 are arranged such that the positive electrode external terminals 1c and the negative electrode external terminals 1d are alternately continuous along the stacking direction. A pair of end plates 3 are disposed at both ends in the stacking direction of the plurality of battery cells 1. The pair of end plates 3 constitutes a first securing portion as a pair of clamping members. Female screws 3 a and 3 b are screwed on the outer surface (for example, the upper surface and the wide side surface) of the end plate 3. The female screw 3 a is formed on the upper surface of the end plate 3, and the female screw 3 b is formed on the wide surface of the end plate 3.
　各電池セル１及びエンドプレート３の間には、絶縁性のセル間スペーサー４が介在されている。セル間スペーサー４は電池セル１同士の絶縁と断熱を目的とするものであり、その目的が達成されていれば、必ずしも備えることに限定されるものではない。また、セル間スペーサー４は各電池セル１及びエンドプレート３の間に単に介在してもよいし、接着（例えば、両面テープや接着剤）による固定をしてもよい。 An insulating inter-cell spacer 4 is interposed between each battery cell 1 and the end plate 3. The inter-cell spacer 4 is intended to insulate and insulate the battery cells 1 and is not necessarily limited to being provided as long as the purpose is achieved. Further, the inter-cell spacer 4 may be simply interposed between each battery cell 1 and the end plate 3, or may be fixed by adhesion (for example, double-sided tape or adhesive).
（電池ブロック）
　図４は、電池ブロック５の外観斜視図、図５は、電池ブロック５の一部を分解した状態を示す分解斜視図である。 (Battery block)
4 is an external perspective view of the battery block 5, and FIG. 5 is an exploded perspective view showing a state in which a part of the battery block 5 is disassembled.
　電池ブロック５は、図４及び図５に示すように、電池セル積層体２の上面側にアッパープレート６、底面側にロアープレート７を備える。本実施形態では、アッパープレート６は樹脂製材料により構成され、ロアープレート７は、金属板を折り曲げ加工することによって構成されている。アッパープレート６とロアープレート７は、電池セル積層体２における上面側と缶底側に配置された一対の挟持部材として第２の固縛部を構成する。 As shown in FIGS. 4 and 5, the battery block 5 includes an upper plate 6 on the upper surface side of the battery cell laminate 2 and a lower plate 7 on the bottom surface side. In the present embodiment, the upper plate 6 is made of a resin material, and the lower plate 7 is formed by bending a metal plate. The upper plate 6 and the lower plate 7 constitute a second securing portion as a pair of sandwiching members disposed on the upper surface side and the can bottom side in the battery cell stack 2.
　電池ブロック５を組み立てるには、電池セル積層体２を積層方向に押圧し、所定の寸法になったところで、アッパープレート６を電池セル１の電池蓋１ｂ（上面ＰＵ）に当接させ、両端一対それぞれのエンドプレート３の雌ねじ３ａにねじ締結によって固定する。そして、同時にロアープレート７を電池セル１の底面ＰＢに接触させ、両端一対それぞれのエンドプレート３の雌ねじ３ｂにねじ締結によって固定する。 To assemble the battery block 5, the battery cell stack 2 is pressed in the stacking direction, and when the predetermined size is reached, the upper plate 6 is brought into contact with the battery lid 1 b (upper surface PU) of the battery cell 1, It fixes to the internal thread 3a of each end plate 3 by screw fastening. At the same time, the lower plate 7 is brought into contact with the bottom surface PB of the battery cell 1 and is fixed to the female threads 3b of the end plates 3 at the both ends by screw fastening.
　上記した電池ブロック５の構成によれば、電池セル積層体２に押圧力が加わった状態で、両端一対のエンドプレート３の間隔が一定に保たれる。したがって、Ｙ方向の車両の振動や衝撃に対して電池セル１の個別の動きや電池セル積層体２の動きを抑制することができる。また、アッパープレート６及びロアープレート７が電池セル１の上面ＰＵ及び底面ＰＢそれぞれに挟み込む形で接触状態を保つことから、Ｚ方向の車両の振動や衝撃に対して電池セル１の個別の動きや電池セル積層体２の動きを抑制することができる。 According to the configuration of the battery block 5 described above, the distance between the pair of end plates 3 at both ends is kept constant in a state where a pressing force is applied to the battery cell stack 2. Therefore, the individual movement of the battery cell 1 and the movement of the battery cell stack 2 can be suppressed against the vibration and impact of the vehicle in the Y direction. In addition, since the upper plate 6 and the lower plate 7 are kept in contact with each of the upper surface PU and the bottom surface PB of the battery cell 1, the individual movement of the battery cell 1 against the vibration and impact of the vehicle in the Z direction The movement of the battery cell stack 2 can be suppressed.
　図６は、図４のVI－VI線に沿う拡大断面図である。
　アッパープレート６は、複数の電池セル１の位置を、少なくとも電池セル積層体２の積層方向で且つ積層方向に直角で一面に水平な方向から規制する位置規制手段として、押さえ片６ａ、６ｂ、６ｃを有している。 6 is an enlarged cross-sectional view taken along line VI-VI in FIG.
The upper plate 6 is a pressing piece 6a, 6b, 6c that serves as a position restricting means for restricting the positions of the plurality of battery cells 1 from at least the stacking direction of the battery cell stack 2 and the direction perpendicular to the stacking direction and horizontal to one surface. have.
　アッパープレート６には、図６に示すように、電池セル１に突設された正極外部端子１ｃ及び負極外部端子１ｄに対応して押さえ片６ａ、６ｂ、６ｃが突設されており、この押さえ片６ａ、６ｂ、６ｃと正極外部端子１ｃ及び負極外部端子１ｄとが当接される。押さえ片６ａ、６ｂ、６ｃは、正極外部端子１ｃ及び負極外部端子１ｄに対して電池蓋１ｂ（一面）に沿った方向で且つ電池セル１の積層方向に直交する方向である積層体幅方向、すなわち、電池セル１の幅方向に対向して配置されるように設けられている。そして、正極外部端子１ｃ及び負極外部端子１ｄのガスケット１ｇと電池セル１の幅狭側面ＰＮに直接当接することによって、電池セル１がＸ方向である電池セル積層体２の積層体幅方向に移動するのを規制して位置決めすることができる。 As shown in FIG. 6, pressing pieces 6a, 6b, 6c are provided on the upper plate 6 so as to correspond to the positive external terminal 1c and the negative external terminal 1d protruding from the battery cell 1. The pieces 6a, 6b, 6c are brought into contact with the positive external terminal 1c and the negative external terminal 1d. The pressing pieces 6a, 6b, and 6c are stacked in the width direction of the stacked body, which is a direction along the battery lid 1b (one surface) with respect to the positive electrode external terminal 1c and the negative electrode external terminal 1d and perpendicular to the stacking direction of the battery cells 1. That is, it is provided so as to face the width direction of the battery cell 1. The battery cell 1 moves in the stack width direction of the battery cell stack 2 in the X direction by directly contacting the gasket 1g of the positive electrode external terminal 1c and the negative electrode external terminal 1d and the narrow side surface PN of the battery cell 1. It is possible to restrict the positioning and position.
　押さえ片（第１の押さえ片）６ａは、電池セル１の正極外部端子１ｃ及び負極外部端子１ｄの積層体幅方向中央寄りの内側端部にそれぞれ対向して配置されるように対をなして設けられており、正極外部端子１ｃ及び負極外部端子１ｄのガスケット１ｇと直接当接することによって、電池セル１が電池セル積層体２の積層体幅方向に移動するのを規制して位置決めをする。 The pressing pieces (first pressing pieces) 6a are paired so as to be disposed to face the inner end portions of the positive electrode external terminal 1c and the negative electrode external terminal 1d of the battery cell 1 near the center in the stack width direction. The battery cell 1 is positioned by being in direct contact with the gasket 1 g of the positive electrode external terminal 1 c and the negative electrode external terminal 1 d by restricting the battery cell 1 from moving in the stack width direction of the battery cell stack 2.
　押さえ片（第２の押さえ片）６ｂは、電池セル１の正極外部端子１ｃ及び負極外部端子１ｄの積層体幅方向外側の外側端部にそれぞれ対向して配置されるように対をなして設けられており、正極外部端子１ｃ及び負極外部端子１ｄのガスケット１ｇと直接当接することによって、電池セル１が電池セル積層体２の積層体幅方向に移動するのを規制して位置決めをする。 The pressing pieces (second pressing pieces) 6b are provided in pairs so as to be arranged to face the outer ends of the battery cell 1 on the outer side in the stack width direction of the positive electrode external terminal 1c and the negative electrode external terminal 1d. In this case, the battery cell 1 is positioned by restricting the battery cell 1 from moving in the stack width direction of the battery cell stack 2 by directly contacting the gasket 1g of the positive electrode external terminal 1c and the negative electrode external terminal 1d.
　押さえ片（第３の押さえ片）６ｃは、電池セル１の積層体幅方向両側の端面である幅狭側面ＰＮにそれぞれ対向して配置されるように対をなして設けられており、電池セル１の幅狭側面ＰＮと当接することによって、電池セル１が電池セル積層体２の積層体幅方向に移動するのを規制して位置決めをする。 The pressing pieces (third pressing pieces) 6c are provided in pairs so as to be arranged to face the narrow side surfaces PN that are the end surfaces on both sides in the stack width direction of the battery cell 1, respectively. By contacting the narrow side surface PN of 1, the battery cell 1 is positioned by restricting movement of the battery cell stack 2 in the stack width direction.
　アッパープレート６の押さえ片６ａ、６ｂ、６ｃは、必ずしも全てを設ける必要はなく、少なくともいずれか一つを有していればよい。押さえ片６ａ、６ｂ、６ｃによって電池セル１のＸ方向の位置決めがなされるほか、Ｘ方向の車両の振動や衝撃に対して電池セル１の個別の動きや電池セル積層体２の動きを抑制することができる。 The pressing pieces 6a, 6b, 6c of the upper plate 6 do not necessarily need to be provided all, and may have at least one of them. In addition to positioning the battery cell 1 in the X direction by the pressing pieces 6a, 6b, 6c, the individual movement of the battery cell 1 and the movement of the battery cell stack 2 are suppressed against the vibration and impact of the vehicle in the X direction. be able to.
　ロアープレート７は、図５に示すように、電池セル積層体２の底面に対向する底部７ａと、底部７ａの積層方向両端部で折曲されてエンドプレート３に対向するフランジ部７ｂと、底部７ａの幅方向両端部で折曲されて電池セル１の幅狭側面ＰＮに対向するエッジ部７ｃを有している。底部７ａには、電池セル積層体２の各電池セル１の缶底を露出させるように複数の開口穴が設けられている。フランジ部７ｂには、エンドプレート３の雌ねじ３ｂに連通する穴が設けられており、エンドプレート３にねじ締結できるようになっている。エッジ部７ｃ（第４の押さえ片）は、各電池セル１の幅狭側面ＰＮに対向して当接することにより、電池セル１が電池セル積層体２の積層体幅方向に移動するのを規制して位置決めをする。 As shown in FIG. 5, the lower plate 7 includes a bottom portion 7a that faces the bottom surface of the battery cell stack 2, a flange portion 7b that is bent at both ends in the stacking direction of the bottom portion 7a and faces the end plate 3, and a bottom portion. 7 a has an edge portion 7 c that is bent at both ends in the width direction and faces the narrow side surface PN of the battery cell 1. A plurality of opening holes are provided in the bottom portion 7 a so as to expose the can bottom of each battery cell 1 of the battery cell stack 2. The flange portion 7 b is provided with a hole communicating with the female screw 3 b of the end plate 3 so that the end plate 3 can be screwed. The edge portion 7c (fourth pressing piece) faces the narrow side surface PN of each battery cell 1 so as to be in contact with it, thereby restricting the battery cell 1 from moving in the stack width direction of the battery cell stack 2. And positioning.
　上記した電池ブロック５の構成によれば、アッパープレート６の押さえ片６ａ、６ｂ、６ｃ及びロアープレート７のエッジ部７ｃによって電池セル１のＸ方向の位置決めがなされる。したがって、従来のように電池セルを保持するセルホルダーを別個に設ける必要がなく、全体の部品点数を減らし、組立工数を削減することができる。 According to the configuration of the battery block 5 described above, the battery cell 1 is positioned in the X direction by the pressing pieces 6 a, 6 b, 6 c of the upper plate 6 and the edge portion 7 c of the lower plate 7. Therefore, it is not necessary to separately provide a cell holder for holding the battery cell as in the prior art, and the total number of parts can be reduced and the number of assembly steps can be reduced.
　本実施形態におけるアッパープレート６は、電池セル１のガス排出弁１ｅに対応するとともに、Ｙ方向断面に対して一様な形状の空間（６ｉ）を設けている。アッパープレート６は、電池セル積層体２の積層体幅方向中央位置で積層方向に沿って延在するガスレール部６ｇを有している。ガスレール部６ｇは、断面コ字状を有しており、電池セル１のガス排出弁１ｅと対向する位置に配置されて、電池セル１の電池蓋１ｂとの協働により、積層方向に連通する閉空間６ｉを形成する。これによれば、電池セル１の内圧の上昇によりガス排出弁１ｅが開裂して排出された電池容器内のガスを、ガス排出弁１ｅが連通するガスレール部６ｇに誘導し、ガスレール部６ｇの閉空間６ｉによって所定の領域に流出させることができ、意図しない領域（例えば、正極外部端子１ｃや負極外部端子１ｄの周辺、図示しない車両搭載のためのケースなどの部品）への流出を防ぐことができる。 The upper plate 6 in the present embodiment corresponds to the gas discharge valve 1e of the battery cell 1 and is provided with a space (6i) having a uniform shape with respect to the cross section in the Y direction. The upper plate 6 has a gas rail portion 6 g extending along the stacking direction at the center position in the stack width direction of the battery cell stack 2. The gas rail portion 6g has a U-shaped cross section, is disposed at a position facing the gas discharge valve 1e of the battery cell 1, and communicates with the battery lid 1b of the battery cell 1 in the stacking direction. A closed space 6i is formed. According to this, the gas in the battery container expelled by the gas discharge valve 1e being cleaved by the increase in the internal pressure of the battery cell 1 is guided to the gas rail portion 6g communicated with the gas discharge valve 1e, and the gas rail portion 6g is closed. The space 6i can flow out to a predetermined area, and can prevent outflow to an unintended area (for example, the periphery of the positive external terminal 1c and the negative external terminal 1d, parts such as a case for mounting on a vehicle not shown). it can.
（電池モジュール）
　図７は、電池モジュール８の外観斜視図、図８は、電池モジュール８の一部を分解した状態を示す分解斜視図、図９は図７の拡大上面図である。
　電池モジュール８は、電池ブロック５の互いに隣り合う電池セル１の正極外部端子１ｃと負極外部端子１ｄとの間が複数のバスバー９によってそれぞれ電気的に接続される。電池セル１の正極外部端子１ｃ及び負極外部端子１ｄの一部には、各電池セル１の電圧を測定するための電圧検出線１０が接続されている。これらのバスバー９及び電圧検出線１０は、正極外部端子１ｃ及び負極外部端子１ｄに突設されたボルトにナットを締結することで固着される。 (Battery module)
7 is an external perspective view of the battery module 8, FIG. 8 is an exploded perspective view showing a state in which a part of the battery module 8 is disassembled, and FIG. 9 is an enlarged top view of FIG.
In the battery module 8, the positive electrode external terminal 1c and the negative electrode external terminal 1d of the battery cells 1 adjacent to each other in the battery block 5 are electrically connected by a plurality of bus bars 9, respectively. A voltage detection line 10 for measuring the voltage of each battery cell 1 is connected to a part of the positive electrode external terminal 1 c and the negative electrode external terminal 1 d of the battery cell 1. The bus bar 9 and the voltage detection line 10 are fixed by fastening nuts to bolts protruding from the positive external terminal 1c and the negative external terminal 1d.
　アッパープレート６には、バスバー９を保持するための固定フック６ｅが設置されている。これによれば、あらかじめアッパープレート６にバスバー９を保持させておくことができるので、アッパープレート６を電池セル積層体２に組み付ける際に、バスバー９を所定位置に配置することが可能である。したがって、複数のバスバー９を簡単にセットすることができ、組立作業の効率を向上させることができる。 The upper plate 6 is provided with a fixing hook 6e for holding the bus bar 9. According to this, since the bus bar 9 can be held on the upper plate 6 in advance, the bus bar 9 can be disposed at a predetermined position when the upper plate 6 is assembled to the battery cell stack 2. Therefore, a plurality of bus bars 9 can be easily set, and the efficiency of assembly work can be improved.
　アッパープレート６には複数本ある電圧検出線１０を１本ずつに仕切る仕切り板６ｄが設置されている。これによれば、衝撃や衝突によって電圧検出線１０の被覆部分が露出しても、電圧検出線１０同士の短絡を防ぐことができる。また、アッパープレート６には、電圧検出線１０の締結部に回転防止片６ｆが設けられている。これによれば、ナット締結時に電圧検出線１０の端子が伴って回ってしまうことを防ぐことができる。 The upper plate 6 is provided with a partition plate 6d that partitions a plurality of voltage detection lines 10 one by one. According to this, even if the covering portion of the voltage detection line 10 is exposed due to an impact or a collision, a short circuit between the voltage detection lines 10 can be prevented. Further, the upper plate 6 is provided with a rotation preventing piece 6 f at the fastening portion of the voltage detection line 10. According to this, it can prevent that the terminal of the voltage detection wire | line 10 rotates with a nut fastening.
　図１０は、電池モジュール８のアッパープレート６にカバー１１を取り付けた状態を示す外観斜視図である。
　カバー１１は、アッパープレート６に設置された突起６ｈに係合される。カバー１１は、アッパープレート６のバスバー９及び電圧検出線１０を覆う。カバー１１で覆うことによって、バスバー９及び電圧検出線１０の絶縁を図ることができる。 FIG. 10 is an external perspective view showing a state in which the cover 11 is attached to the upper plate 6 of the battery module 8.
The cover 11 is engaged with a protrusion 6 h installed on the upper plate 6. The cover 11 covers the bus bar 9 and the voltage detection line 10 of the upper plate 6. By covering with the cover 11, the bus bar 9 and the voltage detection line 10 can be insulated.
　上記構成を有する電池モジュール８によれば、アッパープレート６に押さえ片６ａ、６ｂを設けてアッパープレート６の押さえ片６ａをガスケット１ｇに直接当接させることによって、電池セル１のＸ方向の移動を規制し、位置決めをすることができる。したがって、一対のエンドプレート３と、アッパープレート６と、ロアープレート７という極めて簡単な構成で、電池セル１のＸ方向、Ｙ方向、Ｚ方向の位置規制と、電池セル１同士の相対的な位置ずれの動きの抑制を達成することができる。 According to the battery module 8 having the above configuration, the holding pieces 6a and 6b are provided on the upper plate 6 and the holding pieces 6a of the upper plate 6 are brought into direct contact with the gasket 1g, thereby moving the battery cell 1 in the X direction. It can be regulated and positioned. Therefore, the position of the battery cell 1 in the X direction, the Y direction, and the Z direction and the relative positions of the battery cells 1 are extremely simple with a pair of end plates 3, an upper plate 6, and a lower plate 7. Suppression of displacement movement can be achieved.
＜実施形態２＞
　図１１は、電池セル積層体２とロアープレート７の間に熱伝導シート１２及び熱交換器１３を介在させた実施例、図１２は、図１１の一部を分解した状態を示す分解斜視図を示す。 <Embodiment 2>
FIG. 11 is an embodiment in which the heat conductive sheet 12 and the heat exchanger 13 are interposed between the battery cell laminate 2 and the lower plate 7, and FIG. 12 is an exploded perspective view showing a state in which a part of FIG. 11 is disassembled. Indicates.
　ロアープレート７は、熱交換手段として熱伝導シート１２及び熱交換器１３を各電池セル１の底面ＰＢに押し付けた状態で固定する。固定後、各電池セル１の底面ＰＢと熱交換器１３は熱伝導シート１２を介して熱的に結合状態となる。図示しないが、ロアープレート７自体に熱交換機能を設けてもよい（ロアープレート７と熱交換器１３をひとつの部品で実施してもよい）。上記によれば、入出力性能が温度によって左右される電池セル１において、加温や冷却の温度制御が可能となる。 The lower plate 7 fixes the heat conductive sheet 12 and the heat exchanger 13 as heat exchanging means in a state where they are pressed against the bottom surface PB of each battery cell 1. After fixing, the bottom surface PB of each battery cell 1 and the heat exchanger 13 are thermally coupled via the heat conductive sheet 12. Although not shown, the lower plate 7 itself may be provided with a heat exchange function (the lower plate 7 and the heat exchanger 13 may be implemented as one component). According to the above, in the battery cell 1 whose input / output performance depends on the temperature, temperature control for heating and cooling can be performed.
　以上、本発明の実施形態について詳述したが、本発明は、前記の実施形態に限定されるものではなく、特許請求の範囲に記載された本発明の精神を逸脱しない範囲で、種々の設計変更を行うことができるものである。例えば、前記した実施の形態は本発明を分かりやすく説明するために詳細に説明したものであり、必ずしも説明した全ての構成を備えるものに限定されるものではない。また、ある実施形態の構成の一部を他の実施形態の構成に置き換えることが可能であり、また、ある実施形態の構成に他の実施形態の構成を加えることも可能である。さらに、各実施形態の構成の一部について、他の構成の追加・削除・置換をすることが可能である。 Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various designs can be made without departing from the spirit of the present invention described in the claims. It can be changed. For example, the above-described embodiment has been described in detail for easy understanding of the present invention, and is not necessarily limited to one having all the configurations described. Further, a part of the configuration of an embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of an embodiment. Furthermore, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.
１　電池セル
１ａ　電池缶
１ｂ　電池蓋
１ｃ　正極外部端子
１ｄ　負極外部端子
１ｅ　ガス排出弁
１ｆ　絶縁性フィルム
２　電池セル積層体
３　エンドプレート
５　電池ブロック
６　アッパープレート
６ａ　押さえ片(第１の押さえ片)
６ｂ　押さえ片(第２の押さえ片)
６ｃ　押さえ片(第３の押さえ片)
６ｇ　ガスレール部
７　ロアープレート
７ｃ　エッジ部（第４の押さえ片）
８　電池モジュール
９　バスバー
１１　カバー
１２　熱伝導シート
１３　熱交換器 DESCRIPTION OF SYMBOLS 1 Battery cell 1a Battery can 1b Battery cover 1c Positive electrode external terminal 1d Negative electrode external terminal 1e Gas exhaust valve 1f Insulating film 2 Battery cell laminated body 3 End plate 5 Battery block 6 Upper plate 6a Holding piece (1st holding piece)
6b Presser piece (second presser piece)
6c Presser piece (third presser piece)
6g Gas rail part 7 Lower plate 7c Edge part (fourth pressing piece)
8 Battery module 9 Bus bar 11 Cover 12 Heat conduction sheet 13 Heat exchanger

Claims (8)

  1. 　正極外部端子及び負極外部端子を一面に備えた角形の電池セルが複数、前記一面を同じ方向に面するように一方向に積層されてなる電池セル積層体と、
    　前記電池セル積層体の積層方向の両端に配置された一対の挟持部材を備えた第１の固縛部と、
    　前記電池セル積層体における前記一面の側及び前記一面とは反対側の面の側に配置された一対の挟持部材を備えた第２の固縛部とを有し、
    　前記第１の固縛部の一対の挟持部材のそれぞれと前記第２の固縛部の一対の挟持部材のそれぞれとが固定され、
    　前記第２の固縛部は、前記複数の電池セルの位置を、少なくとも前記電池セル積層体の積層方向で且つ該積層方向に直角で前記一面に水平な方向から規制する位置規制手段を有することを特徴とする電池モジュール。     A plurality of rectangular battery cells each having a positive electrode external terminal and a negative electrode external terminal on one side, a battery cell laminate formed by laminating in one direction so that the one surface faces the same direction;
    A first lashing portion comprising a pair of clamping members disposed at both ends in the stacking direction of the battery cell stack;
    A second lashing portion including a pair of clamping members disposed on the one surface side and the one surface side opposite to the one surface in the battery cell stack,
    Each of the pair of clamping members of the first lashing portion and each of the pair of clamping members of the second lashing portion are fixed,
    The second securing portion has position restricting means for restricting the positions of the plurality of battery cells at least in the stacking direction of the battery cell stack and perpendicular to the stacking direction from the horizontal direction on the one surface. A battery module characterized by.
  2. 　前記正極外部端子と前記負極外部端子は、前記電池セルの前記一面である電池蓋において前記積層方向に直交する方向に互いに離間した位置に設けられており、
    　前記第２の固縛部は、該第２の固縛部の一対の挟持部材として、前記電池セルの前記一面である電池蓋に対向するアッパープレートと、前記電池セルの缶底に対向するロアープレートとを有しており、
    　前記アッパープレートと前記ロアープレートの少なくとも一方は、前記位置規制手段として前記正極外部端子及び前記負極外部端子に対して前記電池蓋に沿った方向で且つ前記積層方向に直交する方向である積層体幅方向に対向して配置された押さえ片を有することを特徴とする請求項１に記載の電池モジュール。     The positive external terminal and the negative external terminal are provided at positions separated from each other in a direction orthogonal to the stacking direction in the battery lid that is the one surface of the battery cell,
    The second lashing portion includes, as a pair of clamping members of the second lashing portion, an upper plate that faces the battery lid that is the one surface of the battery cell, and a lower that faces the can bottom of the battery cell. A plate,
    At least one of the upper plate and the lower plate is a stack width that is a direction along the battery lid and a direction orthogonal to the stacking direction with respect to the positive electrode external terminal and the negative electrode external terminal as the position restricting means The battery module according to claim 1, further comprising a pressing piece disposed to face the direction.
  3. 　前記アッパープレートは、前記押さえ片として前記正極外部端子及び前記負極外部端子の前記積層体幅方向の中央寄りの内側端部にそれぞれ対向して配置される一対の第１の押さえ片を有することを特徴とする請求項２に記載の電池モジュール。 The upper plate has a pair of first pressing pieces disposed as opposed to the inner end portions of the positive electrode external terminal and the negative electrode external terminal near the center in the stacked body width direction as the pressing pieces. The battery module according to claim 2.
  4. 　前記アッパープレートは、前記押さえ片として前記正極外部端子及び前記負極外部端子の前記積層体幅方向の外側の外側端部にそれぞれ対向して配置される一対の第２の押さえ片を有することを特徴とする請求項２に記載の電池モジュール。 The upper plate has a pair of second pressing pieces disposed as opposed to the outer end portions of the positive electrode external terminal and the negative electrode external terminal in the stacked body width direction as the pressing pieces, respectively. The battery module according to claim 2.
  5. 　前記アッパープレートは、前記押さえ片として前記電池セルの前記積層体幅方向の両側の端面にそれぞれ対向して配置される一対の第３の押さえ片を有することを特徴とする請求項２に記載の電池モジュール。 The said upper plate has a pair of 3rd pressing piece arrange | positioned as the said pressing piece facing each end surface of the both sides of the said laminated body width direction of the said battery cell, respectively. Battery module.
  6. 　前記ロアープレートは、前記押さえ片として前記電池セルの前記積層体幅方向の両側の端面にそれぞれ対向して配置される一対の第４の押さえ片を有することを特徴とする請求項２に記載の電池モジュール。 The said lower plate has a pair of 4th pressing piece respectively arrange | positioned facing the both end surfaces of the said laminated body width direction of the said battery cell as said pressing piece. Battery module.
  7. 　前記電池セルは、前記電池蓋にガス排出弁が設けられており、
    　前記アッパープレートは、前記ガス排出弁に連通するガスレール部を有していることを特徴とする請求項２に記載の電池モジュール。     The battery cell is provided with a gas discharge valve on the battery lid,
    The battery module according to claim 2, wherein the upper plate has a gas rail portion that communicates with the gas discharge valve.
  8. 　前記第２の固縛部は、熱交換手段を有することを特徴とする請求項１に記載の電池モジュール。 The battery module according to claim 1, wherein the second lashing portion has a heat exchange means.
PCT/JP2016/065109 2015-06-12 2016-05-23 Battery module WO2016199563A1 (en)

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