WO2020031620A1 - 組電池 - Google Patents

組電池 Download PDF

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Publication number
WO2020031620A1
WO2020031620A1 PCT/JP2019/027740 JP2019027740W WO2020031620A1 WO 2020031620 A1 WO2020031620 A1 WO 2020031620A1 JP 2019027740 W JP2019027740 W JP 2019027740W WO 2020031620 A1 WO2020031620 A1 WO 2020031620A1
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WO
WIPO (PCT)
Prior art keywords
battery
band
cell
stacking direction
supports
Prior art date
Application number
PCT/JP2019/027740
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
啓善 山本
柴田　大輔
久 梅本
大樹 内山
諒 太田
周平 吉田
雅貴 内山
Original Assignee
株式会社デンソー
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 株式会社デンソー filed Critical 株式会社デンソー
Publication of WO2020031620A1 publication Critical patent/WO2020031620A1/ja

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • 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
    • H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
    • H01M10/625—Vehicles
    • 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
    • H01M10/653—Means for temperature control structurally associated with the cells characterised by electrically insulating or thermally conductive materials
    • 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
    • H01M10/6556—Solid parts with flow channel passages or pipes for heat exchange
    • 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
    • H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
    • H01M10/6561—Gases
    • 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
    • H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
    • H01M10/6567—Liquids
    • 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
    • H01M50/20—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
    • H01M50/291—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 characterised by their shape
    • 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
    • H01M50/30—Arrangements for facilitating escape of gases
    • 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 disclosure in this specification relates to an assembled battery.
  • Patent Document 1 discloses a battery module having a restraining member that restrains the battery stack in a state where both sides of the battery stack in the stacking direction are pressed in the stacking direction.
  • the restraining member is a band-shaped member having a surface that contacts the side wall of the battery stack.
  • the restraining member covers each of two opposite side walls in the battery stack over the entire stacking direction.
  • An object of the disclosure in this specification is to provide an assembled battery capable of improving strength against vibration and impact.
  • One of the disclosed assembled batteries has a battery stack including a plurality of battery cells stacked and installed, and a support portion that supports the battery stack, and has a binding force in the stacking direction of the battery with respect to the battery stack. And a restraining band that gives The support portion supports a predetermined facing surface and at least one adjacent surface adjacent to the facing surface of the battery stack in the stacking direction over a length of the battery stack in the stacking direction.
  • the restraining band applies a restraining force in the stacking direction to the battery stack, and supports a predetermined facing surface and its adjacent surface. This suppresses the amount of deflection of the battery stack when vibration or impact acts on both the facing face and the adjacent face of the battery stack such that the ends in the stacking direction warp with respect to the center. It is possible to increase the strength of the battery laminate with respect to a strong force. Therefore, according to this assembled battery, the strength against vibration and impact can be improved.
  • FIG. 2 is a perspective view showing the battery pack of the first embodiment. It is a top view of an assembled battery. It is a side view of an assembled battery.
  • FIG. 4 is a sectional view taken along the line IV-IV in FIG. 2. It is the figure which looked at the assembled battery in the lamination direction. It is an exploded view regarding a battery pack. It is a figure explaining assembling an assembly of a battery cell and a 1st support member into a passage member of a heat carrier integrally. It is a figure explaining assembling the assembly of a battery cell and a 2nd support member, and forming a battery laminated body. It is a figure explaining forming a battery laminated body and a restraint plate integrally.
  • FIG. 22 is a sectional view taken along the line XXII-XXII in FIG. 21.
  • FIG. 22 is a sectional view taken along the line XXII-XXII in FIG. 21.
  • FIG. 22 is a sectional view taken along a line XXIII-XXIII in FIG. 21. It is the figure which looked at the assembled battery in the lamination direction. It is an exploded view regarding a battery pack. It is a figure explaining attaching
  • FIG. 33 is a cross-sectional view taken along the line XXXIV-XXXIV in FIG. 32. It is the figure which looked at the assembled battery in the lamination direction. It is an exploded view regarding a battery pack. It is a figure explaining attaching
  • the battery pack 1 includes a battery stack 10 having a plurality of battery cells 2 stacked and installed, and a restraint band that restrains the battery stack 10 in the stacking direction and supports a surface on which the battery stack 10 is formed. 5 and 6.
  • the battery pack 1 is mounted on an electric vehicle such as a hybrid vehicle using a combination of an internal combustion engine and a motor driven by electric power charged in a battery as a driving source, and an electric vehicle using a motor as a driving source.
  • the plurality of battery cells 2 included in the assembled battery 1 are, for example, a nickel hydrogen secondary battery, a lithium ion secondary battery, an organic radical battery, an all-solid battery, and the like.
  • the thickness direction of the battery cell 2 is the stacking direction of the battery cells 2 in the battery stack 10, and is also referred to as the battery stacking direction.
  • the direction orthogonal to both the stacking direction and the vertical direction is the width direction or the lateral direction of the battery cell 2.
  • the assembled battery 1 is controlled by electronic components used for charging and discharging the plurality of battery cells 2 or controlling the temperature.
  • the battery pack 1 is formed integrally by constraining a plurality of battery cells 2 that are connected to be able to conduct electricity and are stacked and installed in the stacking direction. Further, the battery pack 1 may be stored in a housing.
  • the above-mentioned electronic components are, for example, a DC / DC converter, a motor driving a fluid driving device for flowing a heat medium, an electronic component controlled by an inverter, various electronic control devices, and the like.
  • the assembled battery 1 may be a device including such electronic components.
  • the battery cells 2 constituting the battery stack 10 are unit cells having a rectangular outer case.
  • the rectangular unit cell has a rectangular parallelepiped shape whose outer peripheral surface is covered by an outer case made of, for example, aluminum, an aluminum alloy, or the like.
  • each of two electrode terminals 20 composed of a positive electrode terminal and a negative electrode terminal protrudes from the upper surface 21 of the outer case, and the direction of the protrusion is an upward direction perpendicular to the battery stacking direction.
  • the outer case of the battery cell 2 may be formed of, for example, resin in addition to metal. Further, the battery cell 2 may include a film in which a resin and an aluminum foil are laminated as an outer case.
  • the battery stack 10 is formed by sandwiching a set in which a predetermined number of battery cells 2 and inter-cell portions 44 of the heat medium passage member 4 are alternately stacked by a pair of end plates 3 from both ends in the stacking direction. It is formed integrally by applying a restraining force toward it.
  • the end plate 3 is formed in a flat box having a thickness dimension smaller than a vertical length or a width length.
  • the assembled battery 1 is a device having a configuration in which a plurality of stacked battery cells 2 and a heat medium flowing through an internal passage of the heat medium passage member 4 exchange heat.
  • the heat medium is a temperature-regulating fluid that can cool and heat the battery cells to adjust the temperature.
  • the heat medium is a gas, a liquid, or a gas-liquid mixed fluid, or may be a fluid that does not undergo a state change during use or a fluid that undergoes a phase change.
  • the assembled battery 1 includes a heat medium passage member 4 provided integrally with the plurality of battery cells 2.
  • the heat medium passage member 4 is formed of a material having thermal conductivity, for example, a metal containing aluminum, a metal containing copper, a resin material containing a metal, a carbon resin material, or the like.
  • the battery pack 1 includes a plurality of battery cells 2, an inter-cell portion 44 interposed between the adjacent battery cells 2, and a connecting portion 43 connecting the adjacent inter-cell portions 44.
  • a pair of end plates 3 and a pair of end plates 3 are provided with restraining bands 5 and 6 for providing a restraining force to compress the end plates 3 from both sides.
  • Each of the restraint bands 5 and 6 is a band-shaped member that supports the outer surface of the laminate in which the battery laminate 10 and the set of end plates 3 are combined.
  • Each of the restraint bands 5 and 6 has its end fixed to the set of end plates 3 by rivets so as to maintain a state of providing a compressive force to the battery stack 10.
  • the end plate 3 includes an upper surface 30, a lower surface 32 opposed to the upper surface 30, a pair of vertically elongated side surfaces 33 adjacent to the upper surface 30 and the lower surface 32, and an inner width surface 31 facing the adjacent battery cell 2. , And an outer width surface 34 facing the width surface 31.
  • the rivets can be replaced with fastening means such as bolts and nuts and screws, and fixing means such as welding.
  • Each of the restraint bands 5 and 6 is formed of a material having excellent strength such as a metal or a hard resin material so that the plurality of battery cells 2 and the like can be pressed and integrated with a stable force.
  • the restraint bands 5 and 6 are common in that a restraining force is applied to compress the battery stack 10 in the stacking direction, but support different surfaces in the battery stack 10.
  • the battery stack 10 includes a plurality of pairs of upper and lower walls 10a and 10b, a pair of facing side walls 10c and 10d, and a pair of facing side walls 10e and 10f. Forming a surface.
  • the restraining band 5 supports one side surface of the battery stack 10 over the entire stacking direction and applies a restraining force to the battery stack 10 in the battery stacking direction.
  • the restraining band 5 includes a support portion 50 that supports the battery stack 10, and fixing portions 51 located at both ends of the support portion 50.
  • the fixing part 51 is a part where the restraining band 5 is fixed to the battery pack 1.
  • the fixing portion 51 is a plate-like portion that extends perpendicular to the supporting portion 50 at both ends in the longitudinal direction of the supporting portion 50.
  • the restraining band 5 maintains a state in which a necessary restraining force is provided to the battery stack 10 by fixing the fixing portion 51 of the restraining band 5 to each end plate 3 by a rivet or the like. .
  • the fixing portion 51 is fixed to a lower portion of each end plate 3.
  • the battery pack 1 includes at least two restraining bands 5.
  • the constraining band 5 has a support portion 50 that supports each of the surfaces in a face-to-face relationship among the surfaces formed by stacking the battery cells 2 in the battery stack 10.
  • the set of restraint bands 5 is a first restraint band that supports the facing surface of the battery stack 10.
  • the support portion 50 has a shape extending along each of the facing side walls 10c and 10d among the surfaces of the battery stack 10 along the stacking direction.
  • the side wall 10c and the side wall 10d are surfaces formed in the battery stack 10 so as to face each other and to extend in the vertical direction and the stacking direction.
  • the upper wall 10a and the lower wall 10b are surfaces formed by stacking the battery cells 2 in the battery stack 10, and are surfaces that face each other and are formed along the stacking direction and the width direction.
  • the upper wall 10a and the lower wall 10b are adjacent surfaces that intersect and are adjacent to the side walls 10c and 10d, respectively.
  • the upper wall 10a and the lower wall 10b are adjacent surfaces that intersect and are adjacent to the side walls 10e and 10f, respectively.
  • the side walls 10c and 10d are adjacent surfaces that intersect and are adjacent to the side walls 10e and 10f, respectively.
  • the supporting portion 50 covers a part of the side surface 23 of the battery cell 2 included in the battery stack 10 and is disposed over the entire length of the battery stack 10 in the stacking direction.
  • the support portion 50 supports, from the outside, portions of the side walls 10c and 10d of the battery stack 10 that do not interfere with the heat medium passage member 4.
  • the support portion 50 supports the portions of the side walls 10c and 10d other than the portions where the heat medium passage member 4 is exposed, from the outside.
  • the support portion 50 moves the lower position, which is farther away from the restraining band 6 than the heat medium passage member 4, on the side walls 10 c and 10 d from the lower wall.
  • the position on the 10b side is supported.
  • the support part 50 supports the lower part near the lower wall 10b farthest from the upper wall 10a supported by the restraining band 6 on the side walls 10c and 10d.
  • the restraining band 5 also contributes to suppressing displacement of the electrode terminal 20 in the width direction, and contributes to ensuring the quality of electrical components such as bus bars connecting the electrode terminal 20 to each other. Further, since the plurality of constraint bands 5 support both the side wall 10c and the side wall 10d, the displacement of the electrode terminal 20 located on the side closer to the side wall 10c is suppressed, and the electrode terminal located on the side closer to the side wall 10d. 20 displacement suppression. As described above, the restraining band 5 contributes to the improvement of the strength of the battery stack 10 against an external force such that the end in the stacking direction of the facing surface of the battery stack 10 warps in the width direction with respect to the center. .
  • the restraint band 5 is provided with an engagement piece 52 extending from each of both ends in the width direction of the support 50 so as to be orthogonal to the support 50 or in the thickness direction.
  • the engaging piece 52 is a plate-like projecting piece projecting over the entire length of the support 50 in the longitudinal direction.
  • the two engaging pieces 52 form a pair of projecting pieces facing each other over the entire length of the support 50 in the longitudinal direction.
  • the engaging piece 52 is a part that fits into a member on the battery stack 10 side in a state where the restraining band 5 supports the battery stack 10 as shown in FIG. 11.
  • the engagement piece 52 is an engagement portion that engages with the cell support member.
  • the assembled battery 1 has the upper wall 10a supported by two restraining bands 6 spaced apart in the width direction and is restrained in the stacking direction.
  • the restraint band 6 supports one side surface of the battery stack 10 over the entire stacking direction and applies a restraining force to the battery stack 10 in the battery stacking direction.
  • the restraining band 6 includes a support portion 60 that supports the battery stack 10 and fixing portions 61 located at both ends of the support portion 60.
  • the fixing portion 61 is a portion where the restraining band 6 is fixed to the battery pack 1.
  • the fixing portion 61 is a plate-like portion that extends perpendicular to the supporting portion 60 at both ends in the longitudinal direction of the supporting portion 60.
  • the restraining band 6 maintains a state of providing a required restraining force to the battery stack 10 by fixing the fixing portion 61 to each end plate 3 with a rivet or the like.
  • the fixing portion 61 is fixed to an upper portion of each end plate 3.
  • the battery pack 1 includes at least one restraining band 6.
  • the restraining band 6 has a supporting portion 60 that supports at least one of the wall surfaces adjacent to the facing wall portion among the surfaces formed by stacking the battery cells 2 in the battery stack 10.
  • the constraining band 6 is a second constraining band that supports the opposing face of the battery stack 10.
  • the support portion 60 has a shape extending along the upper wall 10a adjacent to the side wall 10c and the side wall 10d in a facing relationship among the surfaces along the stacking direction in the battery stack 10.
  • the upper wall 10a is a surface adjacent to the side wall 10c and the side wall 10d supported by the restraining band 5 in the battery stack 10, and is formed to face each other and to extend along the width direction and the stacking direction.
  • the support portion 60 covers a part of the upper surface 21 of the battery cell 2 included in the battery stack 10 and is disposed over the entire length of the battery stack 10 in the stacking direction.
  • the support portion 60 supports a portion of the upper wall 10a of the battery stack 10 that does not interfere with the electrode terminal 20 from outside.
  • the support portion 60 supports the portion of the upper wall 10a excluding the portion where the electrode terminal 20 is exposed from the outside.
  • the support portion 60 supports a portion of the upper wall 10 a closer to the widthwise end than the electrode terminal 20.
  • the assembled battery 1 includes two restraining bands 6 having such a configuration.
  • the support portion 60 may be configured to support a portion between the electrode terminals 20 on the upper wall 10a.
  • the support portion 60 supports the upper wall 10a, which is the adjacent surface between the facing side walls 10c and 10d, over the entire length in the stacking direction, so that the ends in the stacking direction warp with respect to the central portion.
  • the battery stack 10 is reinforced so as to suppress undesired operations.
  • the constraining band 6 also contributes to suppressing the vertical displacement of the electrode terminal 20 and contributes to ensuring the quality of electrical components such as bus bars connecting the electrode terminal 20 to each other. Further, since the restraining band 6 supports each of both ends in the width direction on the upper wall 10a, the displacement of the electrode terminal 20 located on the side closer to the side wall 10c and the electrode located on the side closer to the side wall 10d are suppressed. This contributes to both the displacement suppression of the terminal 20.
  • the restraining band 6 is configured such that the battery stack 10 is not subjected to an external force in which the end in the stacking direction is warped vertically with respect to the center on the surface adjacent to the surface supported by the restraining band 5 in the battery stack 10. 10 contributes to the strength improvement.
  • the restraining band 6 includes a pair of engaging pieces 62 extending from both ends in the width direction of the support 60 so as to be orthogonal to the support 60 or in the thickness direction.
  • the engaging piece 62 is a plate-shaped projecting piece projecting over the entire length in the longitudinal direction in the support part 60.
  • the two engaging pieces 62 form a set of protruding pieces facing each other over the entire length in the longitudinal direction in the support section 60.
  • the engagement piece 62 is a part that fits into a member on the battery stack 10 side in a state where the restraining band 6 supports the battery stack 10 as shown in FIG. 11.
  • the engagement piece 62 is an engagement portion that engages with the cell support member.
  • the restraining band 6 is adjacent to the side walls 10c and 10d supported by the restraining band 5, and supports a lower wall 10b facing each other and forming a surface extending along the width direction and the laminating direction. May be. Further, the battery pack 1 may have a configuration having a restraining band 6 provided to support not only one of the upper wall 10a and the lower wall 10b but also both of them.
  • the heat medium passage member 4 includes a first passage portion 4a through which the heat medium flows down from one side in the stacking direction to the other side, and a second passage portion 4b through which the heat medium flows down from the other side in the stacking direction to one side. ing.
  • the first passage portion 4a and the second passage portion 4b are connected at a relay tank portion 41 provided on the other side.
  • the first passage portion 4a has an inflow tank portion 40 on one side
  • the second passage portion 4b has an outflow tank portion 42 on one side.
  • the first passage portion 4a is located on the upper side in the heat medium passage member 4, the second passage portion 4b is located on the lower side, and the first passage portion 4a and the second passage portion 4b are arranged so as to overlap vertically.
  • the first passage portion 4a and the second passage portion 4b have a plurality of inter-cell portions 44 interposed between the battery cells 2 adjacent in the stacking direction.
  • a heat medium flows through the internal passage of the inter-cell portion 44.
  • the plurality of inter-cell portions 44 are provided so as to be arranged in the stacking direction.
  • An interval equivalent to the thickness dimension of the battery cell 2 in the stacking direction is provided between the inter-cell portions 44 adjacent to each other in the stacking direction.
  • the inter-cell portion 44 is installed in contact with the width surface 22 of the battery cell 2 which is in the width direction and the vertical direction.
  • the width surface 22 is also the belly surface having the largest area in the battery cell 2.
  • a spacer member having thermal conductivity may be interposed between the battery cell 2 and the inter-cell portion 44 so that the spacer member is sandwiched between the battery cell 2 and the inter-cell portion 44.
  • the first passage portion 4a and the second passage portion 4b include the connecting portion 43 connecting the inter-cell portions 44 adjacent to each other in the stacking direction.
  • the heat medium flows through the internal passage of the connecting portion 43.
  • the connecting portion 43 is provided so as to be located outside the battery cell 2 in the width direction of the battery cell 2.
  • the connecting portion 43 is provided so as to face the side surface 23 of the battery cell 2 orthogonal to both the upper surface 21 and the width surface 22.
  • connection portion 43 is a turn portion that turns the heat medium flowing inside the heat medium passage member 4 and changes the direction of the flow to form turn channels that face each other, and is also a turn portion.
  • the connecting portion 43 is a folded portion for changing the direction of the flow path to the opposite direction, and is provided at at least one position in each of the first passage portion 4a and the second passage portion 4b.
  • the first passage portion 4a and the second passage portion 4b form a meandering flow passage as shown in FIGS. 2 and 6 by continuously laminating the folded flow passage via the connecting portion 43.
  • the first passage portion 4a has an inflow tank portion 40 into which the heat medium flows into one end of the folded flow path in the stacking direction, that is, one end in the stacking direction.
  • the inflow tank portion 40 is an inflow portion that introduces a heat medium from outside the battery pack 1 into the heat medium passage member 4.
  • the internal passage of the inter-cell portion 44 located at the end in the stacking direction and located at the upstream end of the heat medium communicates with the internal passage of the inflow tank portion 40 via the passage end 46 and the internal passage of the folded portion 400. ing.
  • a pipe for introducing a heat medium from outside the battery pack 1 is connected to the inflow tank section 40.
  • the passage ends 46 are capable of transferring heat to the battery cells 2 such that the battery cells 2 located at one end of the battery stack 10 exchange heat with the heat medium flowing through the internal passage. It is provided in.
  • the first passage portion 4a communicates with the upper portion of the relay tank portion 41 via the folded portion 410 at the other end in the stacking direction.
  • the second passage portion 4b communicates with the lower portion of the relay tank portion 41 via the folded portion 411 at the other end in the stacking direction.
  • the relay tank portion 41 forms an internal space in which the heat medium transfers from the first passage portion 4a to the second passage portion 4b and flows in the opposite direction.
  • the internal passage of the inter-cell portion 44 located at the other end in the stacking direction in the first passage portion 4a is connected to the relay tank portion 41 via the passage end portion 46 of the first passage portion 4a and the internal passage of the folded portion 410. It communicates with the internal passage.
  • the passage end 46 of the first passage portion 4a is connected to the battery cell 2 so that the battery cell 2 located at the other end of the battery stack 10 and the heat medium flowing through the internal passage exchange heat. It is provided to be able to transfer heat.
  • the internal passage of the inter-cell portion 44 located at the other end in the stacking direction in the second passage portion 4b is connected to the relay tank portion 41 via the passage end 46 of the second passage portion 4b and the internal passage of the folded portion 411. It communicates with the internal passage.
  • the passage end 46 of the second passage portion 4b is connected to the battery cell 2 such that the battery cell 2 located at the other end of the battery stack 10 and the heat medium flowing through the internal passage exchange heat. It is provided to be able to transfer heat.
  • the second passage portion 4b has an outflow tank portion 42 through which the heat medium flows out from one end in the stacking direction.
  • the outflow tank portion 42 is an outflow portion where the heat medium flows out of the heat medium passage member 4 to the outside of the battery pack 1.
  • the internal passage of the inter-cell portion 44 located at the downstream end of the heat medium passage member 4 is connected to the internal passage of the outflow tank portion 42 via the passage end 46 of the second passage portion 4b and the internal passage of the folded portion 420. Communicating.
  • a pipe through which the heat medium flows out of the battery pack 1 is connected to the outflow tank portion 42.
  • the passage end 46 of the second passage portion 4b is connected to the battery cell 2 such that the battery cell 2 located at one end of the battery stack 10 and the heat medium flowing through the internal passage exchange heat. It is provided to be able to transfer heat.
  • the first passage portion 4a and the second passage portion 4b are flat tubes that are elongated in the vertical direction orthogonal to the flow direction when the heat medium exchanges heat with the battery cells 2, that is, both the width direction and the stacking direction.
  • the first passage portion 4a and the second passage portion 4b can be formed by a serpentine tube obtained by bending the flat tube.
  • the flat tube may have a plurality of passages therein and may be a flat multi-hole tube formed by extrusion.
  • the heat medium flows into the upper serpentine pipe from the inflow tank portion 40 located at the upper end on one end side in the stacking direction of the battery stack 10, and is located at the other end side while meandering through the upper half inter-cell portions 44. Flows into the upper portion of the relay tank portion 41.
  • the first passage portion 4a forms a flow passage that meanders along the upper half of the battery cell 2 from one end to the other end.
  • the heat medium further flows down from the upper part to the lower part in the relay tank part 41, flows into the lower serpentine pipe from the lower part in the relay tank part 41, and flows down while meandering in each lower cell inter-part part 44.
  • the second passage portion 4b forms a flow passage meandering along the lower half of the battery cell 2 from the other end to the one end.
  • the heat medium flows through the heat medium passage member 4 through the internal passage, so that the heat of the battery cells 2 is absorbed by the heat medium via the inter-cell portions 44 to cool the battery cells 2. be able to.
  • the heat medium flows through the heat medium passage member 4 through the internal passage, the heat of the heat medium is radiated to the battery cells 2 through the inter-cell portions 44, so that each battery cell 2 can be warmed.
  • the heat medium flowing from the inflow tank portion 40 of the heat medium passage member 4 reaches the outflow tank portion 42 and exchanges heat with the battery cells 2 in all the inter-cell portions 44 arranged in the stacking direction. It is configured to be.
  • the upstream inter-cell portion 44 located at one end and the downstream inter-cell portion 44 located at the other end do not interpose the inter-cell portion 44 therebetween. May be connected. Further, the configuration may be such that the inter-cell portion 44 at one end and the inter-cell portion 44 at the other end are connected via the inter-cell portion 44 provided partially in the battery stack 10. In such a configuration, the inter-cell portion 44 at one end and the inter-cell portion 44 at the other end communicate with each other so that the heat medium flows down the internal passage from one end to the other end.
  • the upstream inter-cell portion 44 located at the other end and the downstream inter-cell portion 44 located at one end do not interpose the inter-cell portion 44 therebetween. May be connected. Further, the inter-cell portion 44 at the other end and the inter-cell portion 44 at the one end may be connected via the inter-cell portion 44 provided partially in the battery stack 10. In such a configuration, the inter-cell portion 44 at the other end and the inter-cell portion 44 at the one end communicate with each other so that the heat medium flows down the internal passage from the other end to the one end.
  • the end plate 3 is attached to the battery stack 10 via sheet-like elastic members 9 at both ends in the stacking direction.
  • the elastic member 9 is formed of an elastically deformable material and has a function of increasing a contact area with both the end plate 3 and the battery cell 2.
  • a set of restraining bands 5 and a set of restraining bands 6 are attached to the battery stack 10 integrated with the end plate 3 as described above, and are supported on a predetermined supporting surface. The force and the restraining force in the stacking direction are applied to the battery stack 10.
  • the battery stack 10 is assembled according to the assembly procedure shown in FIGS. 7 and 8 to integrally form the plurality of battery cells 2 and the heat medium passage member 4.
  • Each battery cell 2 is mounted on the first support member 7 shown in FIG. 12 or the second support member 8 shown in FIG. 14, and is supported in the stacking direction, the vertical direction, and the width direction.
  • the battery cells 2 supported by the second support member 8 are separated from each other by the inter-cell portions 44 and the inter-cell portions 44 adjacent to the first passage portion 4a and the second passage portion 4b, respectively. And inserted into the heat medium passage member 4.
  • the direction in which the integrated product of the second support member 8 and the battery cell 2 is moved in this mounting is the width direction.
  • the battery cell 2 assembled to the heat medium passage member 4 through the assembly shown in FIG. 7 is in a state shown in FIG. As shown in FIG. 8, the length in the stacking direction of the upper wall support portion 81 of the second support member 8 is longer than the thickness of the battery cell 2 and the interval between two adjacent cell inter-portions 44.
  • Reference numeral 81 has a function of preventing the battery cell 2 from dropping downward from the heat medium passage member 4.
  • the battery cell 2 supported by the first support member 7 is connected to the heat medium passage member 4 in which the second support member 8 and the battery cell 2 are integrated. It is inserted between the cell 2 and the battery cell 2, and the first support member 7 and the second support member 8 are engaged.
  • the direction in which the integrated product of the first support member 7 and the battery cell 2 is moved at the time of this assembly is the vertical direction in which the first passage portion 4a and the second passage portion 4b are arranged.
  • the battery stack 10 in which the heat medium passage member 4, the cell support frame, and the battery cells 2 are integrated through the assembly shown in FIG. 8 is in a state shown in FIG. Next, as shown in FIG.
  • the elastic member 9 and the end plate 3 are mounted on both ends of the battery stack 10, and furthermore, the restraining bands 5 and 6 are mounted at predetermined positions as shown in FIG. I do.
  • the assembled battery 1 shown in FIG. 1 can be assembled.
  • the first support member 7 includes a pair of side wall support portions 72 each supporting the side surface 23 of the battery cell 2, and a pair of band support portions 74 provided below the side wall support portion 72.
  • a pair of upper wall support portions 71 and spacer portions 73 which are integrally formed as a cell support member.
  • the pair of side wall support portions 72 are spaced apart from each other by the same size as the length of the battery cell 2 in the width direction.
  • FIG. 13 shows a state where the battery cell 2 is supported by the first support member 7 from one side.
  • FIG. 14 shows a state where the battery cell 2 is supported by the first support member 7 from the other side.
  • the side wall support portion 72 is a plate-like portion having a length in the stacking direction equivalent to the thickness dimension of the battery cell 2.
  • the vertical length of the side wall support portion 72 and the band support portion 74 is equal to the vertical size of the battery cell 2.
  • the upper wall supporting portion 71 is a plate-like portion that protrudes inward from the upper end of the side wall supporting portion 72 so as to be orthogonal to the side wall supporting portion 72, and contacts and supports the upper surface 21 of the battery cell 2.
  • the pair of upper wall support portions 71 are provided in a range that does not contact the electrode terminals 20 at both ends in the width direction of the upper surface 21 of the battery cell 2 and support the upper surface 21 from above.
  • the length of the upper wall support 71 in the stacking direction is equal to the thickness of the battery cell 2.
  • the upper wall support 71 is provided with a pair of grooves 71a separated in the width direction.
  • the set of groove portions 71a is provided so as to satisfy the position, groove width, and groove depth where the set of engagement pieces 62 provided in the restraining band 6 fit.
  • the groove portion 71a is formed on the upper surface of the upper wall support portion 71 so as to penetrate the entire length in the stacking direction. As shown in FIG. 11, the groove 71a is formed such that the groove width dimension is smaller on the bottom side than on the opening side.
  • the groove portion 71a preferably has a tapered surface 71a1 in which the groove width dimension decreases from the opening end toward the groove bottom.
  • the groove 71a preferably has a groove width at the groove bottom that is equal to or less than the thickness of the engagement piece 62.
  • the engagement piece 62 is preferably tapered toward the tip. According to such a configuration, the fitting operation of the restraining band 6 to the cell support member can be reliably and smoothly performed.
  • the upper wall support portion 71 is provided with a protrusion 71b projecting to one side at one end in the stacking direction and a concave portion 71c recessed to one side at the other end in the stacking direction.
  • the band support 74 is provided with a pair of grooves 74a that are vertically separated from each other.
  • the set of groove portions 74a is provided so as to satisfy the position, groove width, and groove depth where the set of engagement pieces 52 included in the restraining band 5 are fitted.
  • the groove portion 74a is formed so as to penetrate the entire length in the stacking direction on the surface of the band support portion 74. As shown in FIG. 11, the groove 74a is formed such that the groove width dimension is smaller on the bottom side than on the opening side.
  • the groove portion 74a preferably has a tapered surface 74a1 in which the groove width dimension decreases from the opening end toward the groove bottom.
  • the groove 74 a preferably has a groove width at the groove bottom that is equal to or less than the thickness of the engagement piece 52.
  • the engagement piece 52 is preferably tapered toward the tip. According to such a configuration, the fitting operation of the restraining band 5 to the cell support member can be reliably and smoothly performed.
  • the band support portion 74 is provided with a protrusion 74b protruding to one side at one end in the stacking direction and a concave portion 74c recessed to one side at the other end in the stacking direction.
  • the spacer portion 73 is a plate-like member having a predetermined length in the up-down direction and extending in the width direction and connecting a pair of side wall support portions 72.
  • the spacer portion 73 is a plate-like member that connects a lower portion of the side wall support portion 72 and a lower portion of the side wall support portion 72 that are separated in the width direction.
  • the spacer portion 73 is also a plate-like member that connects the band support portions 74 separated from each other in the width direction.
  • the spacer portion 73 has a function of interposing between the adjacent battery cells 2 and securing a space for installing the inter-cell portion 44.
  • the spacer portion 73 also functions as a regulating wall that contacts the lower part of the battery cell 2 supported by the first support member 7 and regulates the displacement of the battery cell 2 in the stacking direction.
  • the second support member 8 includes a pair of side wall support portions 82 respectively supporting the side surfaces 23 of the battery cell 2, and a pair of band support portions 84 provided below the side wall support portions 82.
  • a pair of upper wall support portions 81 and a spacer portion 83 which are integrally formed as a cell support member.
  • the pair of side wall supporting portions 82 are spaced apart from each other by the same size as the length of the battery cell 2 in the width direction.
  • FIG. 16 shows a state where the battery cell 2 is supported by the second support member 8 from one side.
  • FIG. 17 shows a state where the battery cell 2 is supported by the second support member 8 from the other side.
  • the side wall support portion 82 is a plate-like portion having a length in the stacking direction equivalent to the thickness dimension of the battery cell 2.
  • the vertical length of the side wall supporting portion 82 and the band supporting portion 84 is equal to the vertical dimension of the battery cell 2.
  • the upper wall support portion 81 is a plate-like portion that protrudes inward from the upper end of the side wall support portion orthogonally to the side wall support portion, and contacts and supports the upper surface 21 of the battery cell 2.
  • the pair of upper wall support portions 81 are provided in a range that does not contact the electrode terminals 20 at both ends in the width direction of the upper surface 21 of the battery cell 2 and support the upper surface 21 from above.
  • the length in the stacking direction of the upper wall support portion 81 is equal to the combined size of the thickness of the battery cell 2 and twice the thickness of the inter-cell portion 44.
  • the upper wall support portion 81 is provided with a pair of groove portions 81a which are separated in the width direction.
  • the set of groove portions 81a is provided so as to satisfy the position, groove width, and groove depth where the set of engagement pieces 62 provided in the restraining band 6 fit.
  • the groove portion 81a is formed on the upper surface of the upper wall support portion 81 so as to penetrate the entire length in the stacking direction. As shown in FIG. 11, the groove 81a is formed such that the groove width dimension is smaller on the bottom side than on the opening side.
  • the groove portion 81a preferably has a tapered surface 81a1 in which the groove width decreases from the opening end toward the groove bottom.
  • the groove 81a preferably has a groove width at the groove bottom equal to or less than the thickness of the engagement piece 62.
  • the upper wall support portion 81 is provided with a protrusion 81b projecting to one side at one end in the stacking direction and a concave portion 81c recessed to one side at the other end in the stacking direction.
  • the band supporting portion 84 is provided with a pair of grooves 84a that are vertically separated from each other.
  • the set of groove portions 84a is provided so as to satisfy the position, the groove width, and the groove depth where the set of engagement pieces 52 provided in the restraining band 5 are fitted.
  • the groove portion 84a is formed on the surface of the band support portion 84 so as to penetrate the entire length in the stacking direction. As shown in FIG. 11, the groove portion 84a is formed such that the groove width dimension is smaller on the bottom side than on the opening side.
  • the groove portion 84a preferably has a tapered surface 84a1 in which the groove width dimension decreases from the opening end toward the groove bottom.
  • the groove 84 a preferably has a groove width dimension at the groove bottom that is equal to or less than the thickness dimension of the engagement piece 52.
  • the band support portion 84 is provided with a protrusion 84b projecting to one side at one end in the stacking direction and a concave portion 84c recessed to one side at the other end in the stacking direction.
  • the spacer portion 83 is a plate-like member having a predetermined length in the up-down direction and extending in the width direction and connecting a pair of side wall support portions 82.
  • the spacer portion 83 is a plate-like member that connects a lower portion of the side wall support portion 82 and a lower portion of the side wall support portion 82 that are separated in the width direction.
  • the spacer portion 83 is also a plate-like member that connects the band support portions 84 that are separated in the width direction.
  • the spacer portion 83 has a function of interposing between the adjacent battery cells 2 and securing a space for installing the inter-cell portion 44.
  • the spacer portion 83 contacts the lower part of the battery cell 2 supported by the second support member 8 and also functions as a regulating wall that regulates displacement of the battery cell 2 in the stacking direction.
  • the first support member 7 and the second support member 8 are made of a resin.
  • the first support members 7 and the second support members 8 are alternately combined in the stacking direction to form a cell support frame that supports the battery cells 2 included in the battery stack 10.
  • the first support member 7 and the second support member 8 are formed of an insulating resin material.
  • the first support member 7 and the second support member 8 are made of, for example, polypropylene, polyethylene, polystyrene, vinyl chloride, fluorine resin, PBT, polyamide, polyamide imide, ABS resin, polyacetal, polycarbonate, polybutylene terephthalate, polyethylene terephthalate, polyphenylene It can be formed of sulfide, phenol, epoxy, acrylic, or the like.
  • FIG. 18 shows a state where the assembly of the battery cell 2 and the first support member 7 and the assembly of the battery cell 2 and the second support member 8 are integrally assembled from one side.
  • FIG. 19 shows the same assembly from FIG. 18 from the other side. 18 and 19 show a state in which the heat medium passage member 4 has been removed.
  • the inter-cell portion 44 is provided in a space formed above the spacer 73 and the spacer 83.
  • the upper wall support portion 71 and the upper wall support portion 81 are integrally connected by fitting the protrusion 71b and the concave portion 81c and abutting their end surfaces. . In this connected state, the groove 71a and the groove 81a form one continuous groove.
  • the band support portion 74 and the band support portion 84 are integrally connected by fitting the projection 74b and the concave portion 84c, and abutting their end surfaces.
  • the groove 74a and the groove 84a form one continuous groove.
  • the battery stack 10 is formed by combining a predetermined number of the assemblies shown in FIG. 18 in the stacking direction.
  • the battery stack 10 includes grooves in which the grooves 71a and the grooves 81a are alternately connected and extend over the entire stacking direction, and the engaging pieces 62 are fitted.
  • the groove 74a and the groove 84a are alternately connected in the entire stacking direction.
  • the engaging portion 52 is provided with a groove extending therethrough.
  • the assembled battery 1 has a battery stack 10 including a plurality of battery cells 2 stacked and installed, and support portions 50 and 60 that support the battery stack 10 in the battery stacking direction with respect to the battery stack 10. And restraining bands (5, 6) for providing a restraining force.
  • the support portions 50 and 60 support a predetermined facing surface and at least one adjacent surface adjacent to the facing surface of the battery stack 10 along the stacking direction over the length of the battery stack 10 in the stacking direction. .
  • the restraining bands 5 and 6 apply a restraining force in the stacking direction to the battery stack 10, and the restraining band 5 supports a predetermined facing surface, and the restraining band 6 is adjacent to the facing surface. Support surface.
  • the battery stack 10 includes a cell support member that supports and stacks the battery cells 2 on the facing surface and the adjacent surface.
  • the restraining band includes a first restraining band that supports the cell supporting member on the facing surface, and a second restraining band that supports the cell supporting member on the adjacent surface. According to this configuration, since the first restraining band supporting the facing surface and the second restraining band supporting the adjacent surface are integrally connected via the cell supporting member, the strength of the entire restraining band can be increased. Thus, the strength of the battery pack against vibrations and the like can be further improved.
  • the first restraining band supports a position farther from the adjacent surface than the central portion at the opposite surface. According to this configuration, the creepage distance from the second restraining band supporting the facing surface to the first restraining band can be increased. Thereby, the supporting force of the first constraining band and the second constraining band on the battery stack 10 can be exerted in a wide range on the facing surface and the adjacent surface of the battery stack 10. It is possible to provide the assembled battery 1 which can support to increase the rigidity and further enhance the strength against vibration and the like.
  • the first restraint band supports the end farther from the adjacent surface supported by the second restraint band over the length of the battery stack 10 in the stacking direction.
  • the battery stack 10 can be supported by the first constraint band such that the creepage distance from the second constraint band to the first constraint band is the longest.
  • the first constraining band supports, on the opposite surface, an end remote from the adjacent surface supported by the second constraining band over the length of the battery stack 10 in the stacking direction. It is preferable to have the electrode terminals 20 exposed.
  • the heat medium passage relating to the temperature control of the battery cell 2 can be provided at a position near the adjacent surface where the first constraint band does not interfere with the facing surface.
  • the battery pack 1 with a high temperature control effect of the battery cell 2 can be provided at a position close to the electrode terminal 20 where the calorific value is large. Therefore, it is possible to achieve both improvement in the strength of the battery stack 10 and battery temperature control. it can.
  • the first restraining band and the second restraining band each have an engaging portion that engages with the cell support member. According to this configuration, since the binding force between the first restraint band and the second restraint band with the cell support member is increased, the rigidity of the entire restraint band integrally connected via the cell support member is increased. be able to.
  • the assembled battery 1 includes the heat medium passage member 4 provided so that the heat medium flowing through the internal passage and the battery cells 2 exchange heat.
  • the heat medium passage member 4 is provided between the battery cells 2 adjacent to each other in the stacking direction, and the inter-cell portion 44 in which the heat medium flowing through the internal passage and exchanging heat with the battery cells 2 is adjacent to each other in the stacking direction.
  • the inter-cell portion 44 and the connecting portion 43 are provided so as to form a series of internal passages through which a heat medium that exchanges heat with all the battery cells 2 flows from one end to the other end in the stacking direction of the battery stack 10. Have been.
  • the vibration in which the ends in the stacking direction of both the facing surface and the adjacent surface warp with respect to the center portion. And the strength of the battery stack 10 against shocks and shocks can be improved.
  • the restraint band includes a first restraint band that supports the battery stack 10 on the facing surface, and a second restraint band that supports the battery stack 10 on the adjacent face.
  • the first restraining band supports a position where the first restraining band does not overlap with the connecting portion 43.
  • the heat medium passage member 4 can be installed at a position where the first constraint band does not interfere with the facing surface.
  • the battery pack 101 includes a heat exchanger 13 that supports each of the side walls 10c, the side walls 10d, and the lower wall 10b forming the battery stack 10 so as to cover them from outside.
  • the heat exchanger 13 has a thin rectangular shape as a whole, is configured to have a heat medium passage through which a heat medium flows, and is installed so as to be able to transfer heat to the battery stack 10.
  • the battery pack 101 is a device having a configuration in which a plurality of battery cells 2 stacked and exchanged heat with a heat medium flowing through an internal passage of the heat exchanger 13.
  • the heat medium is a temperature-regulating fluid capable of controlling the temperature of the battery cell 2 as in the first embodiment.
  • the heat exchanger 13 is formed of a material having thermal conductivity, for example, a metal containing aluminum, a metal containing copper, a resin material containing a metal, a carbon resin material, or the like.
  • the assembled battery 101 has a configuration in which heat transfer is performed between the battery cell 2 and the heat medium via the side surface 23 and the lower surface of the battery cell 2.
  • the heat exchanger 13 that supports each of the side walls 10c, 10d, and the lower wall 10b of the battery stack 10 from the outside is restrained toward the battery stack 10 by the restraining bands 105 and 106 that cover the heat exchanger 13 from the outside.
  • the side wall 10c and the side wall 10d face each other, and the lower wall 10b is a face adjacent to the face.
  • the battery pack 101 includes a plurality of battery cells 2, a cell support member 11, a set of end plates 3, and a restraining band 105 for restraining at least three surfaces of the battery stack 10 from outside.
  • 106 is provided.
  • Each of the restraint bands 105 and 106 is a rectangular member that supports the outer surface of the battery stack 10.
  • Each of the restraint bands 105 and 106 is formed of a material having excellent strength such as a metal or a hard resin material so that the plurality of battery cells 2 and the heat exchanger 13 can be pressed and integrated with a stable force. .
  • the side wall 10c and the side wall 10d of the battery stack 10 have a heat conductive member 12, a heat exchanger 13,
  • the restraining band 105 is mounted via the member 14.
  • a restraining band 106 is attached to the lower wall 10b of the battery stack 10 via a heat conductive member 12, a heat exchanger 13, and an elastic member 14 that are stacked outward.
  • the heat conductive member 12 has a function of improving the heat transfer between each battery cell 2 and the heat exchanger 13.
  • the elastic member 14 is formed of a material that is elastically deformed, and has a function of increasing a contact area with both the restraining band and the heat exchanger 13 and ensuring a state in which the restraining force is easily transmitted.
  • the battery stack 10 has a structure in which a pair of restraining bands 105 and 106 are attached, so that a supporting force for a predetermined facing surface and an adjacent surface is applied to the battery stack 10. Have been.
  • Each end plate 3 is fixed to an installation portion for fixing the battery pack 101 with bolts and nuts.
  • the battery pack 101 is fixed to the installation section. According to this configuration, it is possible to apply a restraining force to the battery stack 10 such that the battery stack 10 is compressed in the stacking direction.
  • the restraint bands 105 and 106 support different surfaces in the battery stack 10.
  • the restraining band 105 includes a support portion 150 having a size to support the entire side walls 10 c and 10 d of the battery stack 10, and engagement pieces 52 extending in the stacking direction at both ends of the support portion 150.
  • the engagement pieces 52 contribute to the fixing force of the restraint band 105 to the battery stack 10.
  • One set of the restraint bands 105 is a first restraint band that supports the facing surface in the battery stack 10.
  • the restraint band 106 includes a support portion 160 sized to support the entire lower wall 10 b of the battery stack 10, and engagement pieces 62 extending in the stacking direction at both ends of the support portion 160.
  • the constraining band 106 is a second constraining band that supports the opposing face of the battery stack 10.
  • the engagement pieces 62 contribute to the fixing force of the restraint band 106 to the battery stack 10.
  • the engagement piece portion 62 is a portion that fits into the member on the battery stack 10 side in a state where the restraining band 106 supports the battery stack 10, similarly to the example illustrated in FIG. 11.
  • the assembled battery 101 has a configuration in which the engagement piece 62 of the restraining band 106 fits into a groove 113d provided in the cell support member 11 and is similar to the groove 111a or the groove 113a.
  • the supporting portion 150 substantially supports the entire side wall 10c and the side wall 10d facing each other, the operation in which the end in the stacking direction is warped with respect to the center and the battery stack 10 is bent in the width direction.
  • the battery stack 10 is reinforced so as to suppress the above.
  • the restraining band 105 also contributes to suppressing displacement of the electrode terminals 20 in the width direction, and contributes to securing the quality of electrical components such as bus bars connecting the electrode terminals 20 to each other. Further, since the plurality of constraint bands 105 support both the side wall 10c and the side wall 10d, the displacement of the electrode terminal 20 located on the side closer to the side wall 10c and the electrode terminal located on the side closer to the side wall 10d are reduced. 20 displacement suppression.
  • the supporting portion 160 supports substantially the entirety of the lower wall 10b adjacent to the side wall 10c and the side wall 10d, the end in the stacking direction is warped with respect to the center and the battery stack 10 is bent in the vertical direction.
  • the battery stack 10 is reinforced so as to suppress undesired operations.
  • the constraining band 106 also contributes to suppressing the vertical displacement of the electrode terminal 20 and contributes to ensuring the quality of electrical components such as a bus bar connecting the electrode terminal 20 to each other.
  • Each battery cell 2 is mounted on the cell support member 11 shown in FIGS. 27 and 28, and is supported in the stacking direction, the vertical direction, and the width direction.
  • the battery stack 10 is formed by combining, in the stacking direction, an integrated product of the cell support member 11 and the battery cell 2 shown in FIG.
  • the cell support member 11 includes a pair of upper wall support portions 111 that support the upper portion 21 and the upper surface 21 of the side surface 23 of the battery cell 2, respectively, and the lower portion of the side surface 23 of the battery cell 2.
  • the spacer portion 112 is the same size as the width surface 22 of the battery cell 2 in the up-down direction and the width direction, and is a plate-like member that connects the pair of upper wall support portions 111 and connects the pair of side wall support portions 113. It is.
  • the spacer portion 112 is interposed between the adjacent battery cells 2, supports the entire width surface 22, and also functions as a regulating wall that regulates displacement of the battery cells 2 in the stacking direction.
  • the upper wall support 111 is an L-shaped cross section extending in the stacking direction from each of the upper corners of the spacer 112.
  • the pair of upper wall support portions 111 are spaced apart from each other by the same size as the length of the battery cell 2 in the width direction.
  • FIG. 29 shows a state where the battery cell 2 is supported by the cell support member 11 from one side.
  • FIG. 30 shows a state where the battery cells 2 are supported by the cell support members 11 from the other side.
  • the upper wall support 111 has a length in the stacking direction equivalent to the thickness of the battery cell 2.
  • the upper wall support portion 111 is in contact with and supports the upper surface 21 of the battery cell 2 at a plate-like portion protruding inward from a corner of the spacer portion 112.
  • the plate-shaped portion is provided in a range that does not contact the electrode terminal 20 at both ends in the width direction of the upper surface 21 of the battery cell 2 and supports the upper surface 21 from above.
  • the length of the upper wall support 111 in the stacking direction is equal to the thickness of the battery cell 2.
  • the upper wall support portion 111 is provided with a groove portion 111a that is separated in the width direction at a portion that supports the side surface 23.
  • the groove 111a is provided so as to satisfy the position, groove width and groove depth where the upper engagement piece 62 in the restraining band 105 fits.
  • the groove 111a is formed so as to penetrate the entire length in the stacking direction in the upper wall support 111. Similar to the embodiment shown in FIG. 11, the groove 111a is formed such that the groove width is smaller on the bottom side than on the opening side.
  • the groove portion 111a preferably has a tapered surface in which the groove width decreases from the opening end toward the groove bottom, as in FIG.
  • the groove 111a preferably has a groove width at the groove bottom that is equal to or less than the thickness of the engagement piece 52. According to such a configuration, the fitting operation of the restraint band 105 to the cell support member can be reliably and smoothly performed.
  • the upper wall support portion 111 is provided with a protrusion 111b protruding to one side at one end in the stacking direction and a concave portion 111c recessed to one side at the other end in the stacking direction.
  • a groove 113a is provided in the side wall support 113.
  • the groove 113a is provided so as to satisfy a position where the lower engagement piece 52 of the restraining band 105 is fitted, a groove width and a groove depth.
  • the groove 113a is formed on the surface of the side wall support 113 so as to penetrate the entire length in the stacking direction. Similar to the embodiment shown in FIG. 11, the groove portion 113a is formed such that the groove width dimension is smaller on the bottom side than on the opening side.
  • the groove 113a preferably has a tapered surface in which the groove width decreases from the opening end toward the groove bottom.
  • the groove 113a preferably has a groove width at the groove bottom equal to or less than the thickness of the engagement piece 52.
  • the side wall support 113 is provided with a groove 113d.
  • the groove 113d is provided so as to satisfy the position, the groove width, and the groove depth of the restraining band 106 where the engagement piece 62 is fitted.
  • the groove 113d is formed on the lower surface of the side wall support 113 so as to penetrate the entire length in the stacking direction. Similar to the embodiment shown in FIG. 11, the groove 113d is formed such that the groove width is smaller on the bottom side than on the opening side.
  • the groove 113d preferably has a tapered surface in which the groove width decreases from the opening end toward the groove bottom, as in FIG.
  • the groove 113d preferably has a groove width at the groove bottom equal to or less than the thickness of the engagement piece 62.
  • the side wall support portion 113 is provided with a protrusion 113b protruding to one side at one end in the stacking direction and a concave portion 113c recessed to one side at the other end in the stacking direction.
  • the assembled battery 101 of the second embodiment is provided along the facing surface and the adjacent surface with respect to the battery stack 10 so that the heat medium flowing through the internal passage and all the battery cells 2 exchange heat.
  • the heat exchanger 13 is provided.
  • the constraining band includes a first constraining band that supports the heat exchanger 13 over the opposite surface and a second constraining band that supports the heat exchanger 13 on the adjacent surface.
  • the ends in the stacking direction of both the facing surface and the adjacent surface warp with respect to the central portion.
  • the strength of the battery stack 10 against such vibration and impact can be improved.
  • the assembled battery 101 can secure the heat exchange performance by increasing the degree of adhesion between each battery cell 2 and the heat exchanger 13, and can suppress a change in shape of the heat exchanger 13 and a change in position of the battery cell 2 due to an external force. .
  • the battery pack 201 of the third embodiment is different from the first embodiment in the restraining band 206.
  • the assembled battery 201 includes one restraining band 206.
  • the restraining band 206 includes the support portion 60, the fixing portion 61, and the engaging piece portion 62, which have the same operation and effect as the first embodiment.
  • the restraint band 206 of the second embodiment forms the discharge passage 63 between the restraint band 206 and the battery stack 10 in a state where the battery stack 10 is restrained.
  • the restraining band 206 covers a central portion of the upper surface of each of the battery cells 2 arranged in a stacked manner, and is provided over the entire length of the battery stacked body 10 in the stacking direction.
  • the discharge passage 63 functions as a gas exhaust passage when gas is ejected from the safety valve of each battery cell 2.
  • the discharge passage 63 is provided along the longitudinal direction of the restraining band 206.
  • a discharge port to the outside is formed at one end of the restraining band 206 in the stacking direction, and the other end of the restraining band 206 is closed.
  • a safety valve is provided on the upper surface 21 of each battery cell 2.
  • the safety valve is provided at the center of the upper surface 21 and is set to break when the internal pressure of the battery cell 2 becomes abnormal.
  • the safety valve is configured by, for example, attaching a thin metal film to a hole opened on the upper surface 21 of the battery cell 2 and closing the hole. In this case, when the internal pressure of the battery cell 2 becomes an abnormal pressure, the metal film is broken and the hole opened on the upper surface 21 is opened, and the gas inside the battery cell 2 flows to the outside of the cell. The release reduces the internal pressure of the cell and prevents the battery cell 2 itself from bursting.
  • the restraint band 206 is provided on the upper surface 21 of the battery cell 2 except for the electrode terminal 20 so as to cover at least the safety valve. Therefore, the safety valve of each battery cell 2 is exposed in the passage formed between the restraining band 206 and the battery stack 10.
  • the restraining band 206 has the same operation and effect as the restraining band 6 and the restraining band 206 described above, and also functions as a smoke exhaust duct for guiding gas ejected from the battery cells 2 to the outside of the battery pack 201.
  • the restraining band 206 is a second restraining band that supports an adjacent face of the battery stack 10.
  • the restraint band 206 is formed of a material having heat resistance.
  • the restraining band 206 is formed of polyphenylene sulfide resin (PPS), polyethylene resin (PE), various resins to which a flame retardant is added, metal, or the like.
  • PPS polyphenylene sulfide resin
  • PE polyethylene resin
  • various resins to which a flame retardant is added metal, or the like.
  • the heat resistance of the restraint band 206 is such that even if the inside of the battery cell 2 is in an abnormally high pressure state and the gas inside blows out due to the breakage of the safety valve, the duct portion does not melt and is not damaged.
  • the restraining band 206 is in close contact with the cell support frame of the battery stack 10 because the pair of engaging pieces 62 extending in the stacking direction is fitted in the groove 86 of the second support member 108.
  • the gas ejected from the safety valve to the outside of the battery cell 2 flows down the discharge passage 63 in the restraining band 206 and is discharged to the outside from the discharge port at one end.
  • the restraint band 206 includes the support portion 60 that supports the battery stack 10 and the fixing portions 61 located at both ends of the support portion 60.
  • the fixing portion 61 is a portion where the restraining band 206 is fixed to the battery pack 201.
  • the restraining band 206 maintains a state of providing a required restraining force to the battery stack 10 by fixing the fixing portion 61 to each end plate 3 with a rivet or the like.
  • the fixing portion 61 of the restraining band 206 is fixed to an upper portion of each end plate 3.
  • Each battery cell 2 is mounted on the first support member 7 shown in FIG. 12 or the second support member 108 shown in FIG. 38, and is supported in the stacking direction, the vertical direction, and the width direction.
  • the first support members 7 and the second support members 108 are alternately combined in the stacking direction to form a cell support frame that supports the battery cells 2 included in the battery stack 10.
  • the second support member 108 is formed of a resin material having an insulating property, like the second support member 8 of the first embodiment.
  • the second support member 108 includes a set of side wall support portions 82, a set of band support portions 84, a set of upper wall support portions 81, a spacer portion 83,
  • the cell support member is provided with a pair of connecting bridge portions 85 and a pair of groove portions 86, which are integrally formed.
  • the connecting bridge portion 85 is a plate-like portion extending in the width direction connecting the pair of upper wall support portions 81.
  • One side of one set of connecting bridge portions 85 corresponds to a bridge portion connecting one end of one pair of upper wall support portions 81, and the other side corresponds to one set of upper wall support portions 81. It is equivalent to a bridge that connects between the other side ends of the bridge.
  • FIG. 39 shows a state where the battery cell 2 is supported by the second support member 108 from one side.
  • FIG. 41 shows a state where the battery cell 2 is supported by the second support member 108 from the other side.
  • the connecting bridge 85 is provided such that the lower end thereof contacts the upper surface 21 of the battery cell 2.
  • the pair of connecting bridge portions 85 are spaced apart in the laminating direction with a spacing dimension that accommodates the electrode terminal 20 inside.
  • a set of grooves 86 has a groove width and a groove depth to which a set of engagement pieces 62 of the restraint band 206 can be fitted.
  • the pair of grooves 86 are spaced apart in the width direction with a spacing dimension that accommodates the safety valve of the battery cell 2 inside.
  • the groove 86 is formed by a U-shaped section extending in the stacking direction.
  • the groove portion 86 extends in the stacking direction such that one end portion is located on one side beyond the connection bridge portion 85 on one side, and the other end portion is located so as to overlap the connection bridge portion 85 on the other side.
  • the groove 86 is configured so that one end is connected to the other end of the groove 86 of the adjacent second support member 8 across the first support member 7. With this configuration, in the cell support frame formed by alternately combining the first support members 7 and the second support members 108 in the stacking direction, one set of the groove portions 86 has the entire length of the battery stack 10 in the stacking direction. To be provided.
  • the restraint band includes the first restraint band that supports the battery stack 10 on the facing surface, and the second restraint band supports the battery stack 10 on the adjacent face.
  • a gas discharge passage 63 communicating with a safety valve provided in the battery cell 2 is provided between the second restraining band and the adjacent surface.
  • the disclosure of this specification is not limited to the illustrated embodiments.
  • the disclosure includes the illustrated embodiments and variations thereon based on those skilled in the art.
  • the disclosure is not limited to the combination of the components and elements shown in the embodiment, and can be implemented with various modifications.
  • the disclosure can be implemented in various combinations.
  • the disclosure may have additional parts that can be added to the embodiments.
  • the disclosure includes those in which the components and elements of the embodiments are omitted.
  • the disclosure encompasses the replacement or combination of parts, elements between one embodiment and another embodiment.
  • the disclosed technical scope is not limited to the description of the embodiments.
  • the technical scope disclosed is shown by the description of the claims, and should be construed to include all modifications within the meaning and scope equivalent to the description of the claims.
  • a battery pack capable of achieving the object disclosed in the specification may have a form in which the restraint band 5 and the restraint band 6 are formed by one restraint band integrally formed in the first embodiment.
  • the restraint band 105 and the restraint band 106 in the second embodiment may be configured as one integrally formed restraint band.
  • a configuration in which the restraining band 5 and the restraining band 206 in the third embodiment are configured by one restraining band integrally formed may be adopted.
  • the battery pack in the above-described embodiment may have a flow path configuration in which the heat medium flows through the heat medium passage member as a whole from one side to the other side in the stacking direction. Further, the battery pack may have a configuration in which the flow paths that flow in one direction from one side to the other side in the stacking direction in the heat medium passage member are arranged in two rows vertically. In this manner, the heat medium passage member 4 is arranged such that the heat medium exchanges heat with all the battery cells 2 from one end to the other end in the stacking direction of the plurality of battery cells 2 included in the battery stack 10. A configuration in which a continuous internal passage is formed may be used. In battery stack 10, one end is on the upstream side of the flow of the heat medium and the other end is on the downstream side.
  • the assembled battery in the above-described embodiment is a stacked body of batteries formed by alternately stacking the battery cells 2 and the inter-cell portions 44, and the assembled battery capable of achieving the object disclosed in the specification is in this form. It is not limited to.
  • the battery pack includes one having a configuration in which the inter-cell portion 44 is interposed only between specific battery cells 2 among all the adjacent battery cells 2 constituting the battery stack 10.
  • the battery pack 1 includes at least one inter-cell portion 44.
  • the constraining band included in the battery pack that can achieve the object disclosed in the specification has a configuration that supports each of the faces facing each other among the faces formed by stacking the battery cells 2 in the battery stack 10.
  • the supporting surface is not limited to the above embodiment.
  • the constraining band included in the battery pack 1 of the first embodiment described above may be configured to support each of the upper wall 10a and the lower wall 10b that face each other.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Battery Mounting, Suspending (AREA)
  • Gas Exhaust Devices For Batteries (AREA)
  • Secondary Cells (AREA)
PCT/JP2019/027740 2018-08-09 2019-07-12 組電池 WO2020031620A1 (ja)

Applications Claiming Priority (2)

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JP2018150503A JP2020027693A (ja) 2018-08-09 2018-08-09 組電池
JP2018-150503 2018-08-09

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JP7730706B2 (ja) * 2021-09-28 2025-08-28 株式会社協豊製作所 電池モジュール支持体
KR20230108428A (ko) * 2022-01-11 2023-07-18 주식회사 엘지에너지솔루션 전지 모듈 및 이를 포함하는 전지팩
JP2024527875A (ja) * 2022-04-27 2024-07-26 エルジー エナジー ソリューション リミテッド バッテリーモジュール、バッテリーパック、及びこれを含む自動車

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JP2014082042A (ja) * 2012-10-15 2014-05-08 Toyota Motor Corp 蓄電モジュール及び熱伝達部材
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