WO2018163708A1 - 組電池の製造方法 - Google Patents
組電池の製造方法 Download PDFInfo
- Publication number
- WO2018163708A1 WO2018163708A1 PCT/JP2018/004446 JP2018004446W WO2018163708A1 WO 2018163708 A1 WO2018163708 A1 WO 2018163708A1 JP 2018004446 W JP2018004446 W JP 2018004446W WO 2018163708 A1 WO2018163708 A1 WO 2018163708A1
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- WIPO (PCT)
- Prior art keywords
- elastic adhesive
- unit cell
- stacking
- stacking direction
- assembled battery
- Prior art date
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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
- H01M50/211—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for pouch cells
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0404—Machines for assembling batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0481—Compression means other than compression means for stacks of electrodes and separators
-
- 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
- H01M50/50—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
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
-
- 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
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/503—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the shape of the interconnectors
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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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/509—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the type of connection, e.g. mixed connections
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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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/564—Terminals characterised by their manufacturing process
- H01M50/566—Terminals characterised by their manufacturing process by welding, soldering or brazing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Definitions
- the present invention relates to a method for manufacturing an assembled battery.
- an assembled battery (corresponding to an all-solid-state battery) that is mounted on a vehicle such as an electric vehicle and can be used as a power source for driving a vehicle motor.
- the assembled battery is formed by stacking a plurality of unit cells (corresponding to battery units). Terminals of different unit cells are electrically connected by a bus bar (corresponding to wiring or the like) (see Patent Document 1).
- An object of the present invention is to provide a method of manufacturing an assembled battery in which the height along the stacking direction of a stack of stacked unit cells can be kept within a certain range even if the thickness of the unit cells varies. There is to do.
- the battery pack manufacturing method for achieving the above object is a battery pack manufacturing method in which a plurality of unit cells are stacked via a filling member and the stacked unit cells are electrically connected.
- a measuring step for measuring the thickness of the unit cell In the method for manufacturing an assembled battery, a measuring step for measuring the thickness of the unit cell, an arrangement step for arranging the filling member having viscosity between the unit cells adjacent in the stacking direction, and the unit cell Pressurizing the arranged filling member in a viscous state in the stacking direction via the unit cell, and reducing the thickness of the filling member in the stacking direction.
- the thickness of the filling member in the stacking direction is determined based on the measured thickness of each of the unit cells adjacent to each other after stacking.
- the distance between the cell stacking centers is kept within a certain range.
- FIG. 1 It is a perspective view which shows the assembled battery which concerns on embodiment.
- FIG. 1 It is a perspective view which shows the principal part of the state which joined the bus bar to the electrode tab of the laminated
- FIG. 4 It is a perspective view which shows the state which electrically connects the 1st cell subassembly shown in FIG. 4 and the 2nd cell subassembly by a bus bar.
- 4 is a state in which the first cell sub-assembly (three sets of cells connected in parallel) shown in FIG. 4 is disassembled for each cell, and the first spacer and the second spacer are removed from one (the uppermost) cell.
- FIG. It is a flowchart which shows the manufacturing method of the assembled battery which concerns on 1st Embodiment.
- FIG. 9B is a perspective view schematically showing a state in which the lower pressure plate has been mounted on the mounting table and one unit cell has been stacked on the lower pressure plate continuously from FIG. 8B.
- FIG. 8C It is a perspective view which shows typically the state which has apply
- FIG. 8H is a perspective view schematically showing a state in the middle of laser welding by bringing the corresponding bus bars into contact with the electrode tabs of the stacked unit cells, continuing from FIG. 8H.
- FIG. 8I laser welding is performed by bringing the anode-side terminal into contact with the anode-side bus bar at the anode-side end, and the cathode-side terminal is brought into contact with the cathode-side bus bar at the cathode-side end.
- FIG. 9 is a perspective view schematically showing a state where a plurality of bus bars are covered with one protective cover, continuing from FIG. 8J. It is a perspective view showing typically the state where another unit cell (illustrated with a broken line) is made to approach one unit cell (illustrated with a solid line) which applied elastic adhesive.
- FIG. 9B is a perspective view schematically showing a state in which another unit cell is further brought closer to one unit cell and the elastic adhesive is spread by the weight of the other unit cell continuously from FIG. 9A. 9B, a pair of spacers attached to the other unit cells are further expanded by further bringing the other unit cells closer to the one unit cell and further spreading the elastic adhesive by the weight of the other unit cells. It is a perspective view which shows typically the state which the lower surface contact
- FIG. 1 It is a side view which shows typically the cell unit laminated
- the side view which shows typically the modification 1 (example which adjusts the quantity of an elastic adhesive according to the difference in the local thickness of a cell) by the cross section of the manufacturing method of the assembled battery of 1st-3rd embodiment. It is.
- a second modification of the battery pack manufacturing method according to the first to third embodiments another example of the shape of the elastic adhesive applied to the single battery
- one single battery coated with the elastic adhesive illustrated by a solid line
- a perspective view which shows typically the state which has made another cell (illustrated with the broken line) approach with respect to.
- 19B is a diagram schematically illustrating a state where the pressing portion of the stacking jig presses the stacked body and the position of the pressing portion in the stacking direction is fixed at a predetermined position, continuing from FIG. 18B.
- It is a top view of the lamination jig in the state of Drawing 18C. It is a figure which shows typically the state which raised the press and canceled the pressurization to the lamination direction from FIG. 18C.
- the direction of the assembled battery 100 is shown using arrows represented by X, Y, and Z.
- the direction of the arrow represented by X indicates the longitudinal direction of the battery pack 100.
- the direction of the arrow represented by Y indicates the short direction of the battery pack 100.
- the direction of the arrow represented by Z indicates the stacking direction of the assembled battery 100.
- the manufacturing method of the assembled battery 100 will be summarized as follows.
- a plurality of unit cells 110 are stacked via a filling member (elastic adhesive 117), and the stacked unit cells 110 are electrically connected. It is the manufacturing method of the assembled battery 100 formed by connecting.
- a measuring step S101 for measuring the thickness of the unit cell 110
- a disposing step S103 for disposing a viscous elastic adhesive 117 between the unit cells 110 adjacent in the stacking direction Z
- Pressurizing step S104 in which the elastic adhesive 117 in a viscous state disposed between the batteries 110 is pressed in the stacking direction Z via the single battery 110, and the thickness of the elastic adhesive 117 in the stacking direction Z is reduced.
- the elastic adhesive 117 is arranged in the stacking direction Z based on the measured thickness of each of the adjacent unit cells 110 after stacking. Controlled by at least one of the amount to be arranged, the length of time to press the elastic adhesive 117 in the pressurizing step S104, and the magnitude of the force to press the elastic adhesive 117 in the pressurizing step S104.
- the distance between the stacking centers of two adjacent unit cells 110 is kept within a certain range.
- a plurality of assembled batteries 100 are mounted on a vehicle such as an electric vehicle and used as a power source for driving a vehicle motor.
- the assembled battery 100 is configured by electrically connecting a laminated body 100S formed by laminating a plurality of single cells 110 via an elastic adhesive 117 by a bus bar unit 130 in a state where the laminated body 100S is pressurized by the pressure unit 120. ing.
- the configuration of the assembled battery 100 (laminated body 100S, pressure unit 120, and bus bar unit 130) will be described with reference to FIGS.
- FIG. 1 is a perspective view showing an assembled battery 100 according to the embodiment.
- FIG. 2 shows the assembled battery 100 shown in FIG. 1 with the pressure unit 120 (the upper pressure plate 121, the lower pressure plate 122, and the left and right side plates 123) removed, and a part of the bus bar unit 130 (the protective cover 135 and the anode). It is a perspective view which shows the state which removed the side terminal 133 and the cathode side terminal 134).
- FIG. 3A is a perspective view showing a main part in a state where the bus bar 132 is joined to the electrode tab 112 of the stacked unit cell 110 in cross section.
- FIG. 3B is a cross-sectional view showing FIG. 3A from the side.
- FIG. 4 is a perspective view showing a state in which the bus bar holder 131 and the bus bar 132 are removed from the laminate 100S shown in FIG.
- FIG. 5 is a perspective view showing a state where the first cell sub-assembly 110M and the second cell sub-assembly 110N shown in FIG. 6 disassembles the first cell sub-assembly 110M (three sets of unit cells 110 connected in parallel) shown in FIG. 4 for each unit cell 110, and the first spacer 110 from one (top) unit cell 110 of the first cell sub-assembly 110M.
- It is a perspective view which shows the state which removed 114 and the 2nd spacer 115.
- the stacked body 100S includes a first cell subassembly 110M including three unit cells 110 electrically connected in parallel and a second cell subassembly 110N including three unit cells 110 electrically connected in parallel. Alternately connected in series.
- the first cell sub-assembly 110 ⁇ / b> M includes three unit cells 110 positioned in the first stage (lowermost stage), the third stage, the fifth stage, and the seventh stage (uppermost stage) in the assembled battery 100. It corresponds to.
- the second cell sub-assembly 110 ⁇ / b> N corresponds to the three unit cells 110 located in the second, fourth, and sixth stages in the assembled battery 100.
- the first cell sub-assembly 110M and the second cell sub-assembly 110N have the same configuration. However, the first cell sub-assembly 110M and the second cell sub-assembly 110N have three anode-side electrode tabs 112A and three cathode-side electrode tabs 112K by replacing the top and bottom of the three unit cells 110 as shown in FIGS. Are arranged alternately along the stacking direction Z.
- all the anode side electrode tabs 112A are located on the left side in the figure, and all the cathode side electrode tabs 112K are located on the right side in the figure.
- the orientation of the tip 112d of the electrode tab 112 varies up and down in the stacking direction Z by simply replacing the top and bottom for every three unit cells 110. For this reason, each tip 112d is refracted downward so that the tips 112d of the electrode tabs 112 of all the unit cells 110 are aligned.
- the single battery 110 corresponds to, for example, a lithium ion secondary battery.
- a plurality of unit cells 110 are connected in series in order to satisfy the specification of the drive voltage of the vehicle motor.
- a plurality of single cells 110 are connected in parallel in order to secure the capacity of the battery and extend the travel distance of the vehicle.
- the unit cell 110 includes a flat power generation element 111 that performs charging and discharging, an electrode tab 112 that is led out from the power generation element 111 and has a tip 112d refracted along the stacking direction Z, and a power generation element A laminating film 113 for sealing 111 is included.
- the power generation element 111 supplies electric power by discharging electric power to a vehicle motor or the like after charging electric power from an outdoor charging stand or the like.
- the power generation element 111 is configured by stacking a plurality of sets of anodes and cathodes separated by a separator.
- the electrode tab 112 faces the power generation element 111 to the outside.
- the electrode tab 112 includes an anode side electrode tab 112A and a cathode side electrode tab 112K.
- the proximal end side of the anode side electrode tab 112A is joined to all the anodes included in one power generation element 111.
- the anode-side electrode tab 112A is formed from a thin plate and is made of aluminum in accordance with the characteristics of the anode.
- the base end side of the cathode side electrode tab 112K is joined to all the cathodes included in one power generation element 111.
- the cathode-side electrode tab 112K is formed from a thin plate and is made of copper in accordance with the characteristics of the cathode.
- the electrode tab 112 is formed in an L shape as shown in FIG. 3B.
- the base end portion 112 c of the electrode tab 112 is supported from below by the support surface 114 b of the first spacer 114.
- the tip 112 d of the electrode tab 112 is refracted along the lower side in the stacking direction Z and faces the contact surface 114 h of the first spacer 114.
- the laminate film 113 is a pair, and seals the power generation element 111 by sandwiching the power generation element 111 from above and below along the stacking direction Z.
- the pair of laminate films 113 lead out the anode-side electrode tab 112A and the cathode-side electrode tab 112K from the gap between the one end portions 113a along the short direction Y to the outside.
- the unit cell 110 is supported by a pair of spacers (first spacer 114 and second spacer 115) as shown in FIG. Laminated.
- the cells 110 are arranged at regular intervals along the stacking direction Z as shown in FIGS. 2, 3A, and 3B.
- the first spacer 114 supports the unit cell 110 on the side provided with the electrode tab 112.
- the second spacer 115 supports the unit cell 110 on the side not provided with the electrode tab 112 so as to face the first spacer 114 in the longitudinal direction X of the unit cell 110.
- the first spacer 114 is formed of a long plate shape having irregularities and is made of reinforced plastics having insulating properties.
- the first spacer 114 is provided so as to face one end 113a of the pair of laminate films 113.
- the first spacer 114 supports one end 113 a of the laminate film 113 by a flat support surface 114 b.
- the first spacer 114 includes a contact surface 114h on a wall surface adjacent to the support surface 114b and extending in the stacking direction Z.
- the contact surface 114h positions the tip 112d of the electrode tab 112 along the longitudinal direction X as shown in FIG. 3B.
- FIG. 3B As shown in FIG.
- the first spacer 114 includes a pair of connecting pins 114 c protruding upward at both ends along the short direction Y of the support surface 114 b.
- the pair of connecting pins 114c has a columnar shape, and the unit cell 110 is positioned by being inserted into connecting holes 113c opened at both ends along the short direction Y of the one end portion 113a of the laminate film 113.
- the plurality of first spacers 114 are in contact with the upper surface 114a of one first spacer 114 and the lower surface 114d of another first spacer 114.
- the plurality of first spacers 114 are positioned so as to open to cylindrical positioning pins 114e protruding from the upper surface 114a of one first spacer 114 and lower surfaces 114d of the other first spacers 114.
- the holes 114f By positioning the holes 114f, they are positioned with respect to each other.
- the first spacer 114 has locating holes 114g at both ends along the short direction Y. The collar 116 is inserted into the locate hole 114g.
- the first spacer 114 has locating holes 114 g at both ends along the short direction Y.
- the locate hole 114g inserts a bolt that positions and connects the plurality of assembled batteries 100 along the stacking direction Z.
- the first spacer 114 Since the second spacer 115 does not need to support the electrode tab 112, the first spacer 114 is simplified.
- the second spacer 115 supports the other end 113b facing the one end 113a of the laminate film 113 along the longitudinal direction X by the support surface 115b.
- the second spacer 115 includes a positioning pin 115 e for positioning the second spacers, a connecting pin 115 c for positioning the unit cell 110, and a plurality of assembled batteries 100, as with the first spacer 114. Locating holes 115g and the like for inserting bolts to be positioned and connected are provided.
- the collar 116 is formed in a cylindrical shape and is made of a metal having sufficient strength.
- the collar 116 is inserted into the pair of locating holes 114g of the first spacer 114 and the pair of locating holes 115g of the second spacer 115, respectively.
- the collar 116 is inserted with a bolt (not shown) that positions and connects the plurality of assembled batteries 100.
- the collar 116 reinforces the first spacer 114 and the second spacer 115 along the stacking direction Z. Compared to the first spacer 114 and the second spacer 115, the collar 116 has a considerably small amount of deformation along the stacking direction Z. That is, the collar 116 functions as a regulating member that regulates the interval between the first spacer 114 and the second spacer to be stacked.
- the elastic adhesive 117 (filling member) is arranged in the gap between the unit cells 110 that are vertically adjacent to each other along the stacking direction Z.
- the elastic adhesive 117 is provided at least in the gap between each unit cell 110 at a portion that overlaps at least the power generation element 111 included in the unit cell 110 along the stacking direction Z.
- the upper pressure plate 121 and the lower pressure plate 122 apply a surface pressure to the power generation element 111 of each unit cell 110.
- the elastic adhesive 117 follows the expansion and contraction along the stacking direction Z of the unit cells 110 and changes the thickness. Further, the elastic adhesive 117 absorbs the stress applied to the laminate film 113 located on the outermost layer of the unit cell 110 when the unit cell 110 vibrates or receives an impact on the unit cell 110, and the laminate The film 113 is protected.
- the elastic adhesive 117 is, for example, a delayed-curing type, and changes its thickness when pressed through the unit cell 110 in a state of having a viscosity before drying.
- the elastic adhesive 117 has an elastic force even after drying.
- the elastic adhesive 117 preferably has a sufficiently small shrinkage strain during drying.
- the cured elastic adhesive 117 is a viscoelastic body having viscosity and elasticity. As a characteristic of the elastic adhesive 117, after the thickness in the stacking direction Z of the elastic adhesive 117 is set in the pressurizing process, the elastic adhesive 117 is crushed by the weight of the cells stacked in the subsequent process and the applied pressure. It has a viscosity that does not decrease.
- the elastic adhesive 117 for example, a material that cures in about 60 minutes is used in consideration of the time required for manufacturing the assembled battery 100.
- the elastic adhesive 117 has a low viscosity before curing and a high fluidity before curing.
- the elastic adhesive 117 is pressed before curing to set its thickness.
- the elastic adhesive 117 is made of, for example, silicone.
- a thermosetting adhesive may be used.
- the configuration of the pressure unit 120 will be described in detail.
- the pressurizing unit 120 includes an upper pressurizing plate 121 and a lower pressurizing plate 122 that pressurize the power generation element 111 of each unit cell 110 of the stacked body 100S from above and below, and an upper pressurizing plate 121 and a lower part in a state where the stacked body 100S is pressed A pair of side plates 123 for fixing the pressure plate 122 is included.
- the upper pressure plate 121 holds the plurality of unit cells 110 constituting the stacked body 100 ⁇ / b> S from above and below, together with the lower pressure plate 122, and generates the power generation element of each unit cell 110.
- 111 is pressurized.
- the upper pressure plate 121 is formed in a plate shape having unevenness and is made of a metal having sufficient rigidity.
- the upper pressure plate 121 is provided on a horizontal plane.
- the upper pressure plate 121 includes a pressure surface 121 a that pressurizes the power generation element 111 downward.
- the pressing surface 121a is formed flat and protrudes downward from the central portion of the upper pressing plate 121.
- the upper pressure plate 121 includes a locating hole 121b into which a bolt for connecting the assembled batteries 100 is inserted.
- the locate hole 121b is formed of a through hole and opens at the four corners of the upper pressure plate 121.
- the lower pressure plate 122 has the same shape as the upper pressure plate 121 and is provided so as to reverse the top and bottom of the upper pressure plate 121. Similarly to the upper pressure plate 121, the lower pressure plate 122 inserts a pressure surface 122 a that pressurizes the power generation element 111 upward, and a bolt that positions and connects the assembled batteries 100 along the stacking direction Z. A hole 122b is provided.
- the pair of side plates 123 fix the upper pressure plate 121 and the lower pressure plate 122 in a state where the laminate 100S is pressurized. That is, the pair of side plates 123 maintains a constant distance between the upper pressure plate 121 and the lower pressure plate 122. Further, the pair of side plates 123 covers and protects the side surfaces along the longitudinal direction X of the stacked unit cells 110.
- the side plate 123 is formed in a flat plate shape and is made of metal.
- the pair of side plates 123 are provided upright so as to face both side surfaces along the longitudinal direction X of the stacked unit cells 110.
- the pair of side plates 123 are welded to the upper pressure plate 121 and the lower pressure plate 122.
- bus bar unit 130 The configuration of the bus bar unit 130 will be described in detail.
- the bus bar unit 130 includes a bus bar holder 131 that integrally holds a plurality of bus bars 132, a bus bar 132 that electrically connects tip portions 112d of electrode tabs 112 of different unit cells 110 (unit cells 110 arranged vertically), Anode-side terminal 133 that allows the anode-side terminals of a plurality of connected unit cells 110 to face an external input / output terminal, and the cathode-side ends of the plurality of electrically connected unit cells 110 that are connected to an external input / output A cathode side terminal 134 facing the terminal, a protective cover 135 for protecting the bus bar 132 and the like are included.
- the bus bar holder 131 integrally holds a plurality of bus bars 132.
- the bus bar holder 131 integrally holds a plurality of bus bars 132 in a matrix so as to face the electrode tabs 112 of each unit cell 110 of the stacked body 100S.
- the bus bar holder 131 is made of an insulating resin and has a frame shape.
- the bus bar holder 131 is a pair of standing up along the stacking direction Z so as to be located on both sides in the longitudinal direction of the first spacer 114 that supports the electrode tab 112 of the unit cell 110.
- Each column 131a is provided.
- the pair of support columns 131 a are fitted to the side surfaces of the first spacer 114.
- the pair of support columns 131a are L-shaped when viewed along the stacking direction Z and are formed in a plate shape extending along the stacking direction Z.
- the bus bar holder 131 is provided with a pair of auxiliary support columns 131b that are erected along the stacking direction Z so as to be located near the center of the first spacer 114 in the longitudinal direction.
- the pair of auxiliary struts 131b are formed in a plate shape extending along the stacking direction Z.
- the bus bar holder 131 includes insulating portions 131 c that protrude between the bus bars 132 adjacent to each other along the stacking direction Z.
- the insulating part 131c is formed in a plate shape extending along the short direction Y.
- Each insulating part 131c is provided horizontally between the auxiliary support part 131b and the auxiliary support part 131b.
- the insulating part 131 c prevents discharge by insulating between the bus bars 132 adjacent along the stacking direction Z.
- the bus bar holder 131 may be formed by joining the supporting column 131a, the auxiliary supporting column 131b, and the insulating portion 131c formed independently of each other, or the supporting column 131a, the auxiliary supporting column 131b, and the insulating portion 131c are integrally formed. You may form and comprise.
- the bus bar 132 electrically connects the electrode tabs 112 of the unit cells 110 arranged vertically.
- the bus bar 132 electrically connects the anode side electrode tab 112 ⁇ / b> A of one unit cell 110 and the cathode side electrode tab 112 ⁇ / b> K of another unit cell 110.
- the bus bar 132 electrically connects, for example, three anode-side electrode tabs 112A arranged above and below the first cell sub-assembly 110M and three cathode-side electrode tabs 112K arranged above and below the second cell sub-assembly 110N. Connect to.
- the bus bar 132 connects three anode side electrode tabs 112A of the first cell sub-assembly 110M in parallel and connects three cathode side electrode tabs 112K of the second cell sub-assembly 110N in parallel. . Further, the bus bar 132 connects three anode side electrode tabs 112A of the first cell sub-assembly 110M and three cathode side electrode tabs 112K of the second cell sub-assembly 110N in series. The bus bar 132 is laser-welded to the anode side electrode tab 112A of one unit cell 110 and the cathode side electrode tab 112K of another unit cell 110.
- the bus bar 132 is configured by joining an anode side bus bar 132A and a cathode side bus bar 132K.
- the anode-side bus bar 132A and the cathode-side bus bar 132K have the same shape, and are formed in an L shape.
- the bus bar 132 is integrated by a joining portion 132 c formed by joining one end of the anode-side bus bar 132 ⁇ / b> A that is refracted and one end of the cathode-side bus bar 132 ⁇ / b> K that is refracted. As shown in FIG.
- the anode side bus bar 132 ⁇ / b> A and the cathode side bus bar 132 ⁇ / b> K constituting the bus bar 132 include side portions 132 d that join the bus bar holder 131 at both ends along the short direction Y.
- the anode-side bus bar 132A is made of aluminum, like the anode-side electrode tab 112A of the unit cell 110.
- the cathode-side bus bar 132K is made of copper, like the cathode-side electrode tab 112K of the unit cell 110.
- the anode-side bus bar 132A and the cathode-side bus bar 132K made of different metals are joined to each other by ultrasonic joining to form a joined portion 132c.
- the bus bar 132 located at the upper right in the drawing of FIG. 4 corresponds to the end of the anode side of 21 unit cells 110 (3 parallel 7 series), and from only the anode side bus bar 132A. It is composed.
- the anode-side bus bar 132A is laser-bonded to the anode-side electrode tab 112A of the uppermost three unit cells 110 among the stacked unit cells 110.
- the bus bar 132 located at the lower left in the drawing of FIG. 4 corresponds to the terminal end on the cathode side of the twenty-one unit cells 110 (three parallel seven series), and from only the cathode side bus bar 132K. It is composed.
- the cathode-side bus bar 132K is laser-bonded to the cathode-side electrode tab 112K of the lowermost three unit cells 110 among the stacked unit cells 110.
- the anode side terminal 133 has the anode-side terminations of a plurality of electrically connected unit cells 110 facing an external input / output terminal. As shown in FIG. 2, the anode-side terminal 133 is joined to the anode-side bus bar 132A located at the upper right in the figure among the bus bars 132 arranged in a matrix.
- the anode side terminal 133 is formed in a plate shape in which both ends are refracted, and is made of a metal having conductivity.
- the cathode side terminal 134 has the terminal on the cathode side of a plurality of electrically connected unit cells 110 facing an external input / output terminal. As shown in FIG. 2, the cathode side terminal 134 is joined to the cathode side bus bar 132K located in the lower left of the figure among the bus bars 132 arranged in a matrix. The cathode side terminal 134 has the same shape as the anode side terminal 133 and is inverted upside down.
- the protective cover 135 protects the bus bar 132 and the like. That is, the protective cover 135 integrally covers the plurality of bus bars 132 to prevent each bus bar 132 from coming into contact with other members and the like to cause an electrical short circuit. As shown in FIG. 2, the protective cover 135 refracts one end 135b and the other end 135c of the side surface 135a standing along the stacking direction Z in the longitudinal direction X like a claw, and has an insulating property. Consists of.
- the protective cover 135 covers each bus bar 132 by a side surface 135a, and fixes the bus bar holder 131 by sandwiching the bus bar holder 131 from above and below by one end 135b and the other end 135c.
- the protective cover 135 has a rectangular opening and a first opening 135d that faces the anode side terminal 133 to the outside, and a second opening 135e that has a rectangular hole and faces the cathode side terminal 134 to the outside. In preparation.
- FIG. 7 is a flowchart showing a method for manufacturing the assembled battery 100 according to the first embodiment.
- the manufacturing method of the assembled battery 100 includes a measuring step S101 for measuring the thickness of the unit cell 110 one by one, a stacking step S102 for stacking the unit cells 110 one by one, and the stacking direction Z.
- Arrangement step S103 in which the elastic adhesive 117 provided between the upper and lower adjacent unit cells 110 is disposed in the unit cell 110, and the stacked body 100S (unit cells 110 stacked in a plurality via the elastic adhesive 117) are pressurized. This is embodied by the pressurizing step S104 and the electrical path connecting step S105 for electrically connecting the stacked unit cells 110.
- the 7 also functions as a pressurizing step S104 that pressurizes and spreads the elastic adhesive 117. That is, in the stacking step S102 shown in FIG. 7, the other unit cells 110B attached to the pair of spacers (the first spacer 114 and the second spacer 115) are naturally dropped as shown in FIGS. 9A to 9C. The other unit cell 110B to which the pair of spacers (the first spacer 114 and the second spacer 115) are attached adds the elastic adhesive 117 applied to the unit cell 110A located relatively below, due to their weight. Press. As a result, the elastic adhesive 117 applied to one unit cell 110A is pressurized by another unit cell 110B and is spread along the horizontal direction (longitudinal direction X and short direction Y).
- FIG. 8A is a diagram illustrating a method of manufacturing the battery pack 100 according to the first embodiment, and measures the thickness of the unit cell 110 attached to a pair of spacers (first spacer 114 and second spacer 115). The state is shown schematically.
- a plurality of unit cells 110 are continuously transported along the longitudinal direction X by a transporter (not shown), and the stacking direction of each unit cell 110 is measured by the measuring device 201. Measure the thickness along Z.
- Each unit cell 110 is transported in a state of being sucked by a suction stand (not shown) provided in the transporter.
- the measuring device 201 irradiates the unit cell 110 and the end of the mounting table with the laser light L1, respectively, and the focal length of the laser beam L1 on the surface of the unit cell 110 and the laser beam L1 on the surface of the suction table.
- the thickness of the unit cell 110 is measured by measuring the difference in focal position.
- the measuring device 201 measures the thickness of the portion of the unit cell 110 that houses the power generation element 111. Based on the thicknesses of the plurality of single cells 110 measured by the measuring device 201, the filling amount V of the elastic adhesive 117 applied to the single cells 110 is determined. The filling amount V of the elastic adhesive 117 applied to each unit cell 110 is the same. If it is known that the thickness of the plurality of unit cells 110 is within a certain range in the measurement step S101, it is not necessary to measure the thickness of all the unit cells 110.
- FIG. 8B and 8C correspond to the stacking step S102.
- FIG. 8B schematically shows a state where the lower pressure plate 122 is mounted on the mounting table 202 and the single cell 110 is being stacked on the lower pressure plate 122, continuing from FIG. 8A. Is shown.
- FIG. 8C schematically shows a state in which the lower pressure plate 122 has been placed on the mounting table 202 and one unit cell 110 has been stacked on the lower pressure plate 122, continuing from FIG. 8B. Show.
- the mounting table 202 used in the stacking step S102 is formed in a plate shape and disposed along the horizontal direction (longitudinal direction X and short direction Y).
- the mounting table 202 includes a locating column 203 for positioning.
- the four locating columns 203 stand up on the mounting surface 202a of the mounting table 202 with a predetermined interval.
- the locating column 203 aligns the relative positions of the lower pressure plate 122, the pair of spacers (first spacer 114 and second spacer 115) attached to the unit cell 110, and the upper pressure plate 121.
- Each laminated member is laminated one by one by a robot arm, a hand lifter, a vacuum suction type collet or the like (each not shown).
- the locating holes 122b provided at the four corners of the lower pressure plate 122 are inserted into the four locating columns 203.
- the lower pressure plate 122 is placed on the placement surface 202 a of the placement table 202 while lowering the lower pressure plate 122 along the stacking direction Z.
- a pair of collars 116 provided at both ends of the first spacer 114 and a pair of collars 116 provided at both ends of the second spacer 115 are inserted into the four locate posts 203.
- the unit cell 110 is stacked on the lower pressure plate 122 while the pair of spacers (the first spacer 114 and the second spacer 115) attached to the unit cell 110 are lowered along the stacking direction Z.
- FIG. 8D corresponds to the placement step S103.
- FIG. 8D schematically shows a state where the elastic adhesive 117 is applied to the unit cells 110 stacked on the lower pressure plate 122, continuing from FIG. 8C.
- an elastic adhesive 117 is applied to the unit cell 110 by the applicator 204.
- the applicator 204 is a so-called coater.
- the applicator 204 is supplied with an elastic adhesive 117 from a storage tank (not shown) via a deformable tube (not shown).
- the applicator 204 applies the elastic adhesive 117 discharged from the nozzle 204a to the unit cell 110 in, for example, an N shape.
- the applicator 204 is moved by a robot arm (not shown) or an electric stage (not shown).
- FIG. 8E corresponds to the stacking process S102.
- the stacking step S102 shown in FIG. 8E functions as a pressurizing step S104 that pressurizes and spreads the elastic adhesive 117 applied to the unit cell 110.
- FIG. 8E schematically shows a state in the middle of stacking another unit cell 110 on the unit cell 110 coated with the elastic adhesive 117, continuing from FIG. 8D.
- the elastic adhesive 117 is placed in the horizontal direction (longitudinal direction X and short side). It also functions as a pressurizing step S104 that spreads along the direction Y).
- FIG. 8E will be described with reference to FIGS. 9A to 9C, FIG. 10, and FIG. 11.
- the lamination step S102 shown in FIG. 8E (also serving as the pressing step S104 of the elastic adhesive 117) will be described.
- one unit cell 110A (illustrated by a solid line) coated with an elastic adhesive 117 approaches another unit cell 110B (illustrated by a broken line) from above.
- the other unit cell 110B to which the pair of spacers (the first spacer 114 and the second spacer 115) are attached naturally falls along the stacking direction Z due to their own weight.
- FIG. 9A to FIG. 9B another unit cell 110 ⁇ / b> B that naturally falls further approaches one unit cell 110 ⁇ / b> A.
- the lower surface of the other unit cell 110B comes into contact with the elastic adhesive 117 applied to the one unit cell 110A.
- the elastic adhesive 117 applied to one unit cell 110A is horizontal depending on the weight of the other unit cell 110B and the weight of a pair of spacers (the first spacer 114 and the second spacer 115) attached to the other unit cell 110. It is spread in the direction (longitudinal direction X and short direction Y).
- the elastic adhesive 117 applied to one unit cell 110A is further pushed and spread along the horizontal direction (longitudinal direction X and short direction Y) in the gap with the other unit cell 110B.
- the elastic adhesive 117 fills the gap between the most area on the upper surface of one unit cell 110A and the most area on the lower surface of the other unit cell 110B in the horizontal direction (longitudinal direction X and short side). Spread in direction Y). That is, when the stacked unit cells 110 are pressurized, a sufficient surface pressure is applied to the power generation element 111 of each unit cell 110 through the elastic adhesive 117.
- first spacer 114 and second spacer 115 the bottom surfaces of a pair of spacers (first spacer 114 and second spacer 115) attached to the other unit cell 110B are finally attached to a pair of spacers (first unit 110A).
- the first spacer 114 and the second spacer 115) are brought into contact with the upper surface and stopped.
- Hard collars 116 are inserted along the stacking direction Z at both ends of the pair of spacers (the first spacer 114 and the second spacer 115).
- the plurality of collars 116 function as stoppers that define and stop the position of another unit cell 110B that naturally falls toward one unit cell 110A.
- the collar 116 strictly defines the distance between the position of the collar 116 between one unit cell 110A and another unit cell 110B.
- FIG. 10 shows a gap between unit cells 110 that are vertically adjacent to each other in the stacking direction Z, and a pressing time of the elastic adhesive 117 that pressurizes the unit cells 110 (of one unit cell 110A with respect to another unit cell 110B). The relationship with the time required for lamination) is shown.
- FIG. 11 schematically shows a unit cell 110 in which a plurality of layers are stacked via an elastic adhesive 117 based on the conditions shown in FIG.
- the interval K along the stacking direction Z of the unit cells 110C to 110F to be stacked is made the same.
- the interval K is defined by the collar 116 inserted into each of the pair of spacers (the first spacer 114 and the second spacer 115).
- the thickness of the unit cell 110C positioned at the bottom is H11
- the thickness of the unit cell 110D positioned directly above the unit cell 110C is H12
- the thickness of the unit cell 110E positioned directly above the battery 110D is H13
- the thickness of the unit cell 110F positioned directly above the unit cell 110E is H13.
- the gap D13 between the unit cell 110C and the unit cell 110D is wider (larger) than the gap D11 between the unit cell 110D and the unit cell 110E.
- the gap D11 between the unit cells 110D and 110E is narrower (smaller) than the gap D12 between the unit cells 110E and 110F.
- the filling amount V11 of the elastic adhesive 117 applied to each unit cell 110 does not depend on the size of the gaps (D11 to D13) between the unit cells 110 that are vertically adjacent to each other after lamination. Are identical. As a result, the elastic adhesive 117 protrudes from the unit cell 110C and the unit cell 110D, between the unit cell 110D and the unit cell 110E, and between the unit cell 110E and the unit cell 110F. become. In any case, in the unit cell 110 positioned relatively lower and the unit cell 110 positioned relatively upper, elastic bonding is performed to a portion where it is necessary to apply surface pressure to the power generation element 111 of each unit cell 110.
- the filling amount V11 of the elastic adhesive 117 with respect to the unit cell 110 is determined so that the agent 117 exists. That is, the filling amount V11 of the elastic adhesive 117 is determined on the assumption that the relatively largest gap D13 can be used.
- the stacking time (T12> T11) of the unit cells 110 varies depending on the size of the gap (D13> D12> D11) between the unit cells 110 adjacent to each other after stacking.
- Lamination time is shortened.
- the stacking time T11 when the gap between the upper and lower adjacent unit cells 110 is D13 is shorter than the stacking time T12 when the gap between the upper and lower adjacent unit cells 110 is D11.
- the placement step S103 shown in FIG. 8D and the stacking step S102 shown in FIG. 8E are repeatedly performed alternately according to the number of unit cells 110 included in the assembled battery 100.
- FIG. 8F corresponds to the stacking process S102.
- FIG. 8F schematically shows a state in the middle of stacking the upper pressurizing plate 121 on the stacked body 100S (the unit cells 110 stacked with a plurality of elastic adhesives 117) continuously from FIG. 8E. Yes.
- locate holes 121 b provided at the four corners of the upper pressure plate 121 are inserted into the four locate columns 203.
- the upper pressure plate 121 is stacked on the unit cell 110 positioned at the top of the stacked body 100S.
- the upper pressure plate 121 and the lower pressure plate 122 are in a state of sandwiching the stacked body 100 ⁇ / b> S (the unit cells 110 stacked in a plurality via the elastic adhesive 117).
- FIG. 8G corresponds to the pressurizing process S104.
- FIG. 8G continues from FIG. 8F and presses the stacked body 100S sandwiched between the upper pressure plate 121 and the lower pressure plate 122 (the unit cells 110 stacked in a plurality via the elastic adhesive 117) by the press 205.
- the state is shown schematically.
- the press 205 moves along the stacking direction Z by a linear motion stage (not shown) or a hydraulic cylinder (not shown).
- a linear motion stage not shown
- a hydraulic cylinder not shown
- the press 205 moves downward along the stacking direction Z
- the stacked body 100S sandwiched between the upper pressure plate 121 and the lower pressure plate 122 is pressed, and a sufficient surface pressure is applied to the power generation element 111 of each unit cell 110. It takes.
- each unit cell 110 can exhibit the desired electrical characteristics.
- FIG. 8H schematically shows a state in which the side plate 123 is laser-welded to the upper pressure plate 121 and the lower pressure plate 122 from FIG. 8G.
- the laser light source 206 is in contact with the upper pressure plate 121 and the lower pressure plate 122 while the side plate 123 is in close contact with the power generation element 111 of each unit cell 110 in a state where sufficient surface pressure is applied. Laser welding.
- the side plate 123 is pressed against the upper pressure plate 121 and the lower pressure plate 122 by a jig (not shown) provided with a laser irradiation punch hole.
- the laser light source 206 is composed of, for example, a YAG (yttrium, aluminum, garnet) laser.
- the laser light L2 derived from the laser light source 206 is scanned horizontally along the upper end 123a and the lower end 123b of the side plate 123 in a state where the optical path is adjusted by an optical fiber or a mirror and condensed by a condenser lens, for example. Weld. Since the side plate 123 includes a pair of the upper pressure plate 121 and the lower pressure plate 122 sandwiched from the left and right, the side plates 123 are laser welded respectively. When the welding of one side plate 123 is completed, the mounting table 202 is rotated so that the other side plate 123 and the laser light source 206 face each other, and then the other side plate 123 is welded.
- the pair of side plates 123 keeps the distance between the upper pressure plate 121 and the lower pressure plate 122 constant. Therefore, even if the press 205 is separated from the upper pressure plate 121, the surface pressure applied to the power generation element 111 of each unit cell 110 is maintained.
- FIG. 8I corresponds to the electrical path connecting process S105.
- FIG. 8I schematically shows a state in the middle of laser welding by bringing each corresponding bus bar 132 into contact with each electrode tab 112 of the stacked unit cells 110 continuously from FIG. 8H. Yes.
- the mounting table 202 is rotated 90 ° counterclockwise in the figure from the state of FIG. 8H so that the electrode tabs 112 of the stacked unit cells 110 face the laser light source 206.
- the bus bar holder 131 is moved by a robot arm (not shown), and each bus bar 132 integrally held by the bus bar holder 131 is pressed against each corresponding electrode tab 112 of the stacked unit cells 110.
- the laser beam L2 is derived from the laser light source 206, and each bus bar 132 and each corresponding electrode tab 112 are seam welded in order.
- FIG. 8J corresponds to the electrical path connection process S105.
- FIG. 8J continues from FIG. 8I, laser welding is performed by bringing the anode-side terminal 133 into contact with the anode-side bus bar 132A at the terminal end on the anode side, and the cathode side with respect to the cathode-side bus bar 132K at the cathode side terminal.
- a state in the middle of laser welding with the terminal 134 in contact is schematically shown.
- the anode-side terminal 133 is joined to the anode-side bus bar 132A that corresponds to the terminal end on the anode side and is located in the upper right in the figure among the bus bars 132 arranged in a matrix.
- the cathode side terminal 134 is joined to the cathode side bus bar 132K which corresponds to the end of the cathode side and is located at the lower left in the figure among the bus bars 132 arranged in a matrix.
- FIG. 8K corresponds to the electrical path connecting process S105.
- FIG. 8K schematically shows a state in which a plurality of bus bars 132 are covered with one protective cover 135, continuing from FIG. 8J.
- the protective cover 135 is moved by a robot arm (not shown), and one end 135b and the other end 135c of the protective cover 135 are fitted into the bus bar holder 131.
- the protective cover 135 is fixed to the bus bar holder 131 by using a hook such as a snap fit, using a screw, or using an elastic adhesive.
- the protective cover 135 has the anode side terminal 133 exposed to the outside from the first opening 135d provided on the side surface 135a, and the cathode side terminal 134 exposed to the outside from the second opening 135e provided on the side surface 135a.
- the protective cover 135 prevents the bus bar 132 from coming into contact with an external member or the like to cause a short circuit or an electric leakage.
- the manufacturing method of the assembled battery 100 described with reference to FIGS. 8A to 8K and the like is an automatic machine that controls the entire process by a controller, a semi-automatic machine in which a part of the process is handled by the worker, or the worker is responsible for the whole process. It may be embodied by any form of manual machine.
- the manufacturing method of the assembled battery 100 is a manufacturing method of the assembled battery 100 in which a plurality of unit cells 110 are stacked via an elastic adhesive 117 and the stacked unit cells 110 are electrically connected.
- a measuring step S101 for measuring the thickness of the unit cell 110 a disposing step S103 for disposing a viscous elastic adhesive 117 between the unit cells 110 adjacent in the stacking direction Z
- Pressurizing step S104 in which the elastic adhesive 117 in a viscous state disposed between the batteries 110 is pressed in the stacking direction Z via the single battery 110, and the thickness of the elastic adhesive 117 in the stacking direction Z is reduced.
- the elastic adhesive 117 is arranged in the stacking direction Z based on the measured thickness of each of the adjacent unit cells 110 after stacking. Controlled by at least one of the amount to be arranged, the length of time to press the elastic adhesive 117 in the pressurizing step S104, and the magnitude of the force to press the elastic adhesive 117 in the pressurizing step S104.
- the distance between the stacking centers of two adjacent unit cells 110 is kept within a certain range.
- the thickness of the elastic adhesive 117 is set to at least one of the pressurizing time T for the elastic adhesive 117, the pressure P for the elastic adhesive 117, and the filling amount V of the elastic adhesive 117.
- the height along the stacking direction Z of the stacked body 100S in which the single cells 110 are stacked is controlled within a certain range. That is, it is not necessary to use a plurality of filling members having different thicknesses in accordance with the thickness of each unit cell 110 adjacent along the stacking direction Z. Therefore, according to the method of manufacturing the assembled battery 100, the height along the stacking direction Z of the stacked body 100S in which the single cells 110 are stacked is within a certain range even if the thickness of the single cells 110 varies. be able to.
- the stacking direction Z of the entire assembled battery 100 is set by keeping the height along the stacking direction Z of the stacked body 100S in which the single cells 110 are stacked within a certain range. Can be set to a predetermined value. Therefore, according to the manufacturing method of the assembled battery 100, it is suitable also when the assembled battery 100 is accommodated in a predetermined case, or when it is accommodated in a predetermined space.
- a single battery 110 having terminals (electrode tabs 112) for inputting and outputting power and a bus bar 132 for electrically connecting the electrode tabs 112 to each other are used.
- the terminals (electrode tabs 112) and the bus bars 132 are connected.
- the distance between the centers in the stacking direction of the two unit cells 110 adjacent in the stacking direction Z is within a certain range, they are adjacent along the stacking direction Z. It becomes easy to keep the distance between the electrode tabs 112 of the unit cell 110 within a certain range. Therefore, after the unit cells 110 are stacked, the electrode tab 112 of the unit cell 110 and the bus bar 132 can be easily joined.
- the elastic filler 117 is filled with a constant amount V, and the elasticity placed between the adjacent unit cells 110 after stacking based on the thickness H of each unit cell 110 adjacent after stacking. The length of time during which the adhesive 117 is pressed is controlled.
- the elasticity provided between the unit cells 110 adjacent in the stacking direction Z can be adjusted by adjusting the pressing time without increasing or decreasing the filling amount V of the elastic adhesive 117. Since the thickness of the adhesive 117 is controlled, the assembled battery 100 can be manufactured with a very simple configuration. That is, according to the method for manufacturing the assembled battery 100, the height along the stacking direction Z of the stacked body 100 ⁇ / b> S in which the single cells 110 are stacked is within a certain range even if the thickness of the single cells 110 varies. be able to.
- the method for manufacturing the assembled battery 100 is suitable when the elastic adhesive 117 is sufficiently soft and a correlation is obtained between the pressurizing time for the elastic adhesive 117 and the thickness of the elastic adhesive 117.
- the pressure applied to the elastic adhesive 117 is constant with respect to the elastic adhesive 117 applied to the relatively lower unit cell 110 by the weight of the unit cell 110 or the like that is relatively upper and naturally falls. By applying a pressure of.
- pressurization to the elastic adhesive 117 is stopped.
- pressurization on the elastic adhesive 117 can be stopped.
- the first spacer 114 and the second spacer 115 that support the unit cell 110 are respectively provided with collars 116 that are provided along the stacking direction Z.
- the collar 116 functions as a regulating member that regulates the interval between the first spacer 114 and the second spacer to be stacked.
- the thickness H of the unit cell 110 it is preferable to measure the thickness H of the unit cell 110 before disposing the filling member (elastic adhesive 117) between the adjacent unit cells 110 after stacking.
- the thickness of the elastic adhesive 117 in the stacking direction Z is controlled based on the measured thickness of each unit cell 110 adjacent after stacking, thereby adjacent to the stacking direction Z.
- the distance between the centers of the two unit cells 110 in the stacking direction is within a certain range. Therefore, the position of the unit cells 110 along the stacking direction Z is always measured so that the interval between the unit cells 110 adjacent to each other along the stacking direction Z is constant, and the filling of the elastic adhesive 117 is repeated. No control is required.
- the electrode tab 112 whose tip 112d is refracted along the stacking direction Z and the bus bar 132 that electrically connects the electrode tabs 112 of different unit cells 110 are arranged in the stacking direction Z. It is suitable for a configuration in which they are brought into contact with each other and joined.
- the distance between the electrode tabs 112 of the unit cells 110 adjacent to each other along the stacking direction Z can be kept within a certain range, and the elastic adhesive 117 is applied to the unit cell 110.
- the unit cell 110 can be prevented from being inclined with respect to the stacking direction Z. For this reason, it can prevent that contact
- This method of manufacturing the assembled battery 100 is suitable for a configuration in which at least a spacer (first spacer 114) that supports the electrode tab 112 is stacked between adjacent unit cells 110 along the stacking direction Z.
- the electrode tab 112 is supported by the first spacer 114, and the electrode tab 112 interferes with the first spacer 114 and buckles due to variations in the thickness of the unit cell 110. It can be prevented from bending. In particular, when the electrode tab 112 is refracted along the stacking direction Z, the electrode tab 112 easily interferes with the first spacer 114 and is easily deformed. Such interference can be prevented by keeping the distance between the electrode tabs 112 within a certain range. Therefore, the assembled battery 100 can be configured using the first spacers 114 that support the electrode tabs 112.
- This method of manufacturing the assembled battery 100 is suitable for a configuration using a spacer (a pair of spacers including the first spacer 114 and the second spacer 115) provided with a defining member (collar 116) that defines a thickness along the stacking direction Z. ing.
- the collar 116 functions as a stopper that defines and stops the position of the other unit cell 110 that naturally falls toward the one unit cell 110. That is, the collar 116 can strictly define the interval at the position of the collar 116 of the unit cells 110A adjacent in the stacking direction Z. Furthermore, the collar 116 can absorb the pressure when an excessive force is generated.
- the elastic adhesive 117 is applied to a region overlapping with the power generation element 111 provided in each unit cell 110 along the stacking direction Z between the unit cells 110 adjacent in the stacking direction Z. Suitable for the configuration to be placed.
- each unit cell 110 can exhibit the desired electrical characteristics.
- This manufacturing method of the assembled battery 100 is suitable for a configuration using a filling member including an elastic adhesive 117 having an elastic force after curing.
- the elastic adhesive 117 absorbs fluctuations in pressure by following expansion and contraction along the stacking direction Z of the unit cells 110 and changing the thickness thereof. Can do.
- This method of manufacturing the assembled battery 100 is suitable for a configuration using the unit cell 110 provided with a covering member (laminate film 113) for insulatingly covering the power generating element 111.
- the elastic adhesive 117 absorbs the stress applied to the laminate film 113 of the unit cell 110 when the unit cell 110 vibrates or an impact is applied to the unit cell 110.
- the laminate film 113 can be protected.
- FIG. 12 illustrates a method of manufacturing the battery pack 100 according to the second embodiment.
- FIG. 13A schematically shows a cross section of an example in which the unit cells 110 are stacked via the elastic adhesive 117 based on the conditions shown in FIG.
- FIG. 13B schematically shows a cross section of another example in which the unit cells 110 are stacked via the elastic adhesive 117 based on the conditions shown in FIG.
- the manufacturing method of the assembled battery 100 of the second embodiment is different from the manufacturing method of the assembled battery 100 of the first embodiment described above in that the magnitude of the force for pressing the elastic adhesive 117 is different.
- the pressing time for the elastic adhesive 117 is varied.
- the intervals K along the stacking direction Z of the unit cells 110 that are stacked by way of the elastic adhesive 117 are the same.
- the thickness of the cell 110G located relatively below is H21
- the thickness of the cell 110H located relatively above is H22, for example, H21> H22.
- the filling amount V of the elastic adhesive 117 applied to the unit cell 110G is set to V21.
- the press 305 pressurizes the unit cell 110H from the unit cell 110H toward the unit cell 110G with the applied pressure P21 so that the distance between the unit cell 110G and the unit cell 110H becomes K.
- the elastic adhesive 117 between the single cells 110G and 110H is spread in the horizontal direction (longitudinal direction X and short direction Y), and the gap between the single cells 110G and 110H becomes D22. Become.
- the thickness of the unit cell 110I positioned relatively above the unit cell 110H is H23, for example, H23> H21.
- the filling amount V of the elastic adhesive 117 applied to the unit cell 110G is set to V21 which is the same as that shown in FIG. 13A.
- the press 305 applies pressure P22 (> P21) from the single cell 110I to the single cell 110G side so that the interval between the single cell 110G and the single cell 110I becomes K.
- P22 > P21
- the elastic adhesive 117 between the single cells 110G and 110I is spread in the horizontal direction (longitudinal direction X and short direction Y), and the gap between the single cells 110G and 110H is D21 ( ⁇ D22).
- the applied pressure (P22> P21) applied to the elastic adhesive 117 via the unit cell 110 differs depending on the size of the gap (D22> D21) between the unit cells 110 adjacent to each other after stacking.
- Reduce the applied pressure For example, the pressure P21 when the gap between the single cells 110 shown in FIG. 13A is D22 (> D21) is smaller than the pressure P22 when the gap between the single cells 110 shown in FIG. 13B is D21.
- the filling amount V of the filling member is constant, and based on the thickness H of each unit cell 110 adjacent after stacking, between the unit cells 110 adjacent after stacking The magnitude of the force for pressing the elastic adhesive 117 to be arranged is controlled.
- the assembled battery 100 adjacent to each other along the stacking direction Z by adjusting the magnitude of the force for pressing the elastic adhesive 117 without increasing or decreasing the filling amount V of the elastic adhesive 117. Since the thickness of the elastic adhesive 117 provided between the single cells 110 is controlled, the assembled battery 100 can be manufactured with a very simple configuration. That is, according to the method for manufacturing the assembled battery 100, the height along the stacking direction Z of the stacked body 100 ⁇ / b> S in which the single cells 110 are stacked is within a certain range even if the thickness of the single cells 110 varies. be able to.
- the elastic adhesive 117 is sufficiently hard, and is suitable when a correlation is obtained between the magnitude of the force for pressing the elastic adhesive 117 and the thickness of the elastic adhesive 117. .
- FIG. 14 shows a manufacturing method of the battery pack 100 according to the third embodiment.
- FIG. 15A schematically shows a cross section of an example in which the unit cells 110 are stacked via the elastic adhesive 117 based on the conditions shown in FIG.
- FIG. 15B schematically shows a cross section of another example in which the unit cells 110 are stacked via the elastic adhesive 117 based on the conditions shown in FIG.
- the method for manufacturing the assembled battery 100 according to the third embodiment differs from the method for manufacturing the assembled battery 100 according to the first embodiment and the second embodiment described above in that the filling amount V of the elastic adhesive 117 with respect to the unit cell 110 is different. Is different.
- the pressing time for the elastic adhesive 117 is varied.
- the magnitude of the force for pressing the elastic adhesive 117 is varied.
- the interval K along the stacking direction Z of the unit cells 110 stacked with the elastic adhesive 117 is made the same.
- the configuration of the two unit cells 110 illustrated in FIGS. 15A and 15B is the same as the configuration of the two unit cells 110 illustrated in FIGS. 13A and 13B.
- the gap between the two unit cells 110 illustrated in FIGS. 15A and 15B is the same as the gap between the two unit cells 110 illustrated in FIGS. 13A and 13B.
- the filling amount (V32> V31) of the elastic adhesive 117 applied to the unit cell 110 differs depending on the size of the gap (D22> D21) between the unit cells 110 adjacent to each other after stacking.
- the filling amount V32 of the elastic adhesive 117 when the gap between the two unit cells 110 shown in FIG. 15A is D22 (> D21) is the case where the gap between the two unit cells 110 shown in FIG. 15B is D21.
- the pressure P31 that pressurizes the unit cell 110 positioned relatively upward by the press 305 is constant.
- the magnitude of the force for pressing the filling member is constant, and the unit cells 110 adjacent after stacking are based on the thickness H of each unit cell 110 adjacent after stacking.
- the filling amount V of the elastic adhesive 117 disposed between the two is controlled.
- the elastic adhesive 117 is adjacent to each other along the stacking direction Z by adjusting the filling amount V of the elastic adhesive 117 without increasing or decreasing the magnitude of the force for pressing the elastic adhesive 117. Since the thickness of the elastic adhesive 117 provided between the single cells 110 is controlled, the assembled battery 100 can be manufactured with a very simple configuration. That is, according to the method for manufacturing the assembled battery 100, the height along the stacking direction Z of the stacked body 100 ⁇ / b> S in which the single cells 110 are stacked is within a certain range even if the thickness of the single cells 110 varies. be able to.
- the method for manufacturing the assembled battery 100 is suitable when the elastic adhesive 117 is sufficiently hard and a correlation is obtained between the filling amount V of the elastic adhesive 117 and the thickness of the elastic adhesive 117.
- FIG. 18A is a diagram schematically illustrating a state in which the presser 420 of the stacking jig 400 is raised to the standby position to form the stacked body 100S.
- 18B is a diagram schematically illustrating a state in which the stacked body 100S is pressed by the press 405, continuing from FIG. 18A.
- 18C is a diagram schematically illustrating a state in which the pressing unit 420 of the stacking jig 400 presses the stacked body 100S and the position of the pressing unit 420 in the stacking direction Z is fixed at a predetermined position, continuing from FIG. 18B. It is.
- FIG. 18D is a plan view of the stacking jig 400 in the state of FIG. 18C.
- FIG. 18E is a diagram schematically illustrating a state where the press 405 is raised and the pressurization in the stacking direction Z is released, continuing from FIG. 18C.
- 19A and 19B are cross-sectional views showing the fixing portion 430 of the stacking jig 400.
- FIG. 19A shows a state in which the locking claw 433 of the ratchet mechanism 432 is engaged with the lock groove 431 of the stopper pin 411.
- FIG. 19B shows a state in which the engagement claw 433 of the ratchet mechanism 432 is disengaged from the lock groove 431 of the stopper pin 411.
- the upper body pressure plate 121 and the lower pressure plate 122 are pressed against the upper pressure plate 121 and the lower pressure plate 122 in a state where the stacked body 100S in which the single cells 110 are stacked is pressed by the press 205 in the stacking direction Z.
- the side plate 123 is laser welded by a laser light source 206. That is, in one processing stage, pressurization and welding joining are performed on the stacked body 100S.
- the pressurizing process and the welding process for the stacked body 100S may be performed in separate processing stages.
- the manufacturing method of the assembled battery 100 of the fourth embodiment can be suitably applied in such a case.
- the stacked body 100S in which the single cells 110 are stacked is pressed by the pressing portion 420 that is movable in the stacking direction Z, and the position of the pressing portion 420 in the stacking direction Z is determined in advance. Then, the pressure in the stacking direction Z is released.
- an apparatus for realizing the manufacturing method will be described.
- the stacking jig 400 used in the pressurizing step includes a base plate 410 on which the lower pressurizing plate 122 is positioned and placed, and a plurality of stopper pins attached on the base plate 410. 411.
- the lower pressure plate 122 on the base plate 410 is positioned using positioning pins or the like.
- the stopper pin 411 extends along the stacking direction Z.
- the stacking jig 400 further includes a plurality of pressers 420 that press the stacked body 100S, and a fixing unit 430 that fixes the position of each presser 420.
- the presser part 420 is provided so as to be movable in the stacking direction Z.
- the fixing part 430 fixes the position of the pressing part 420 in the stacking direction Z to a predetermined position.
- the “predetermined position” is set to a position where the height along the stacking direction Z of the stacked body 100S in which the cells 110 are stacked is within a certain range.
- the holding portion 420 includes a guide block 421 in which an insertion hole 421a is inserted into the stopper pin 411, and a holding block that is provided in the guide block 421 and contacts the upper surface of the laminate 100S. 422.
- An engaging groove (not shown) is formed in a spiral shape on the outer peripheral surface of the stopper pin 411, and a protrusion (not shown) that fits into the engaging groove is formed on the inner peripheral surface of the insertion hole 421a.
- the guide block 421 When the guide block 421 is inserted into the stopper pin 411 and lowered, the guide block 421 rotates as the projection is guided along the spiral engaging groove. As the guide block 421 descends and rotates, the holding block 422 can contact the upper surface of the stacked body 100S from the position where it does not interfere with the stacked body 100S (the position indicated by the broken line in FIG. 18D) (the solid line in FIG. 18D). Rotate to the position shown).
- the holding block 422 does not interfere with the laminated body 100S from a position where it can contact the upper surface of the laminated body 100S as the guide block 421 rises and rotates. Rotate to position.
- the presser 420 waits at a position above the stopper pin 411 and at a position where it does not interfere with the press 405 when the placement of the unit cell 110 and the placement of the elastic adhesive 117 are repeatedly performed.
- the presser 420 is driven up and down in the stacking direction Z between the standby position and the stopper pin 411 by a robot hand or the like.
- the fixing portion 430 includes a lock groove 431 formed in the stopper pin 411 and a ratchet mechanism 432 provided in the presser portion 420 and engageable with the lock groove 431. Since the elastic adhesive 117 is a viscoelastic body even after being cured, the lock groove 431 and the ratchet mechanism 432 have a shape or structure that can press the laminate 100S against the reaction force of the elastic adhesive 117.
- the lock groove 431 is formed with a smaller diameter than the outer diameter of the stopper pin 411. On the upper side in the lock groove 431, a flat locking surface is formed to which the locking claw 433 of the ratchet mechanism 432 contacts.
- the ratchet mechanism 432 includes a first arm portion 434 having a locking claw 433 and a second arm portion 436 connected to the first arm portion 434 via a connecting pin 435.
- the first arm portion 434 is rotatably attached to the guide block 421 by a support pin 437
- the second arm portion 436 is rotatably attached to the guide block 421 by a support pin 438.
- the locking claw 433 has a flat upper side.
- the ratchet mechanism 432 includes a spring member (not shown) that urges the first arm portion 434 and the second arm portion 436 to exert a resilient force.
- the spring force of the spring member acts in the direction in which the locking claw 433 is engaged with the lock groove 431 (see FIG. 19A).
- the ratchet mechanism 432 includes an actuator 440 that releases the engagement of the locking claw 433 in the lock groove 431 against the elastic force of the spring member.
- the actuator 440 is mounted on the holding block 422.
- the tip of the operating rod 441 of the actuator 440 is connected to the end of the second arm 436.
- the actuator 440 is composed of a fluid pressure cylinder that operates by fluid pressure such as compressed air, for example.
- the stopper pin 411 has lock grooves 431 formed at different positions in the stacking direction Z (three places in the illustrated example).
- the presser portion 420 can be fixed at different positions in the stacking direction Z by the ratchet mechanism 432, and one stacking jig 400 can be applied to the manufacture of various types of assembled batteries having different stacked body 100S heights.
- the battery assembly using the stacking jig 400 is manufactured as follows.
- the pressing portion 420 of the stacking jig 400 is raised to the standby position, and the lower pressure plate 122 is positioned and placed on the base plate 410.
- the unit cell 110 is placed on the lower pressure plate 122, and the elastic adhesive 117 is disposed on the unit cell 110.
- the placement of the unit cells 110 and the placement of the elastic adhesive 117 are repeated to form a stacked body 100S in which a predetermined number of unit cells 110 are stacked.
- An upper pressure plate 121 is stacked on the stacked body 100S.
- a stacked body 100S sandwiched between an upper pressure plate 121 and a lower pressure plate 122 (unit cells 110 stacked in a plurality via elastic adhesives 117) is pressed by a press 405.
- the presser part 420 is lowered from the standby position, and the guide block 421 of the presser part 420 is inserted into the stopper pin 411 and lowered.
- the pressing block 422 of the pressing portion 420 rotates from a position where it does not interfere with the stacked body 100S to a position where it can contact the upper surface of the stacked body 100S.
- the latching claw 433 of the ratchet mechanism 432 is engaged with the lock groove 431 by the elastic force of the spring member.
- the pressing portion 420 that is movable in the stacking direction Z presses the stacked body 100S and the position in the stacking direction Z is fixed at a predetermined position.
- the press 405 is raised to release the pressurization in the stacking direction Z.
- the laminated body 100S is pressed by the presser 420, and the elastic adhesive 117 is pressed and spread to a specified thickness.
- the lifting of the laminate 100S due to the reaction force of the elastic adhesive 117 can be suppressed, and the height along the stacking direction Z of the laminate 100S can be maintained within a certain range.
- the laminating jig 400 that pressurizes the laminate 100S is transferred from the pressurizing process stage to the contact process stage.
- laser welding is performed by the laser light source 206 while the pair of side plates 123 are in close contact with the upper pressure plate 121 and the lower pressure plate 122.
- the fluid pressure is supplied to the actuator 440 of the ratchet mechanism 432.
- the engagement of the locking claw 433 with the lock groove 431 is released against the elastic force of the spring member.
- the position of the presser part 420 is released by the fixing part 430.
- the holding block 422 rotates from a position where it can contact the upper surface of the laminated body 100S to a position where it does not interfere with the laminated body 100S.
- the presser part 420 is further raised to the standby position, and the completed assembled battery 100 is unloaded from the stacking jig 400.
- the presser part 420 After taking out the assembled battery 100, the presser part 420 is seated on the base plate 410, and the laminated jig 400 as a set is sent to the processing stage for pressure treatment.
- the forwarding lane can be reduced as compared with the case where the pressing part 420 and the base plate 410 are forwarded separately.
- the combination of the base plate 410 and the holding portion 420 in the stacking jig 400 does not change, the accuracy of maintaining the height along the stacking direction Z of the stacked body 100S within a certain range is ensured for each assembly. There is no change.
- the stacked body 100 ⁇ / b> S in which the single cells 110 are stacked is pressed by the pressing portion 420 that is movable in the stacking direction Z, and the position of the pressing portion 420 in the stacking direction Z is determined in advance. The position is fixed, and then the pressure in the stacking direction Z is released.
- the stacked body 100S is pressed by the presser 420, and the elastic adhesive 117 has a specified thickness. It is pushed up to. At the same time, the lifting of the laminate 100S due to the reaction force of the elastic adhesive 117 can be suppressed, and the height along the stacking direction Z of the laminate 100S can be maintained within a certain range.
- This manufacturing method can be suitably applied to the case where the pressurizing process on the laminated body 100S and the subsequent welding process are performed in separate processing stages.
- the engagement groove formed on the outer peripheral surface of the stopper pin 411 is used, and the position where the presser part 420 does not interfere with the laminated body 100S as the presser part 420 moves up and down, The form which rotates between the position which can contact an upper surface was demonstrated. Not limited to this case.
- the presser 420 may be moved to a position where it does not interfere with the laminated body 100S and a position where it can contact the upper surface of the laminated body 100S using a motor, a cylinder, or the like.
- the fixing part 430 may be anything that can fix the position of the pressing part 420 in the stacking direction Z to a predetermined position, and is not limited to the configuration including the lock groove 431 and the ratchet mechanism 432.
- the fixing unit 430 can be configured by an air clamper.
- the elastic adhesive 117 is not limited to a configuration in which the elastic adhesive 117 is applied to a uniform thickness along the horizontal direction (longitudinal direction X and short direction Y) of the unit cell 110.
- the filling amount V of the elastic adhesive 117 along the horizontal direction (longitudinal direction X and short direction Y) may be appropriately adjusted.
- an insulating tape (not shown) that prevents a short circuit between electrodes is provided inside the unit cell 110J, so that the laminate film is formed to bulge outward.
- the convex part 110m is mentioned.
- the unit cell 110J extends along the horizontal direction (longitudinal direction X and short direction Y). Further, the filling amount V of the elastic adhesive 117 can be appropriately adjusted to apply a uniform surface pressure to the entire surface of the power generation element 111.
- the shape of the elastic adhesive 117 applied to the unit cell 110 is not limited to the N-shape as shown in FIG. 8D and FIGS. 9A to 9C.
- the elastic adhesive 117 is linear along the short direction Y of the unit cell 110 as shown in FIG. 17A.
- a plurality for example, four
- a plurality may be applied at a certain distance along the longitudinal direction X of the unit cell 110.
- another unit cell 110B illustrated by a broken line
- one unit cell 110A illustrated by a solid line.
- the lower surfaces of a pair of spacers (first spacer 114 and second spacer 115) attached to another unit cell 110B are paired with a pair of spacers (first spacer 114 and second spacer attached to one unit cell 110A.
- the elastic adhesive 117 fills the gap between the most area of the upper surface of one unit cell 110A and the most area of the lower surface of the other unit cell 110B in the horizontal direction. It spreads in (longitudinal direction X and short direction Y).
- the thickness of the elastic adhesive 117 may be controlled for each fixed number of stacked unit cells 110.
- the elastic adhesive 117 may be disposed between the unit cells 110 adjacent to each other after the stacking for every fixed number of the unit cells 110.
- the thickness of the elastic adhesive 117 may be controlled.
- the filling member is not limited to the elastic adhesive 117. That is, the filling member may be any member that is sufficiently held in the gap and has a certain elastic force after filling between the unit cells 110 adjacent to each other along the stacking direction Z. As long as the filling member has a sufficient frictional force, an adhesive force is not essential.
- the manufacturing method of the battery pack 100 is not limited to the configuration in which the electrode tab 112 of the unit cell 110 and the bus bar 132 are joined by laser welding. It is good also as a structure which fastens and joins the electrode tab 112 and the bus bar 132 of the cell 110 with a volt
- the unit cell 110 is not limited to a battery in which the power generation element 111 is covered with the laminate film 113.
- the unit cell 110 may be composed of a long rectangular parallelepiped case type battery.
- the unit cells 110 are not limited to the configuration in which the unit cells 110 are electrically connected via the bus bar 132.
- the unit cells 110 may be configured to directly and electrically connect the electrode tabs 112 of the unit cells 110 to each other.
- 100 battery packs 100S laminate, 110, 110A, 110B, 110C, 110D, 110E, 110F, 110G, 110H, 110I, 110J cells, 110M first cell sub-assembly, 110N second cell sub-assembly, 111 power generation elements, 112 electrode tab (terminal), 112A anode side electrode tab, 112K cathode side electrode tab, 113 Laminate film (coating member), 114 first spacer, 115 second spacer, 116 colors, 117 elastic adhesive (filling member), 120 pressure unit, 121 Upper pressure plate, 122 Lower pressure plate, 123 side plate, 130 bus bar unit, 131 Bus bar holder, 132 Busbar, 132A anode side bus bar, 132K Cathode side bus bar, 133 Anode terminal, 134 cathode side terminal, 135 protective cover, 201 measuring instrument, 202 mounting table, 203 Locate support, 204 applicator, 205,305 press, 206 laser light source, 400 stacking ji
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Abstract
Description
図12は、第2実施形態に係る組電池100の製造方法において、積層方向Zに沿って上下に隣り合う単電池110の隙間と、単電池110を介して弾性接着剤117に加える加圧力との関係等を示している。図13Aは、図12に示す条件に基づいて、弾性接着剤117を介して単電池110を積層する一の例を模式的に断面によって示している。図13Bは、図12に示す条件に基づいて、弾性接着剤117を介して単電池110を積層する他の例を模式的に断面によって示している。
図14は、第3実施形態に係る組電池100の製造方法において、積層方向Zに沿って上下に隣り合う単電池110の隙間と、単電池110に塗布する弾性接着剤117の充填量Vとの関係等を示している。図15Aは、図14に示す条件に基づいて、弾性接着剤117を介して単電池110を積層する一の例を模式的に断面によって示している。図15Bは、図14に示す条件に基づいて、弾性接着剤117を介して単電池110を積層する他の例を模式的に断面によって示している。
図18Aは、積層治具400の押え部420を待機位置に上昇させ、積層体100Sを形成した状態を模式的に示す図である。図18Bは、図18Aから引き続き、積層体100Sをプレス405によって加圧した状態を模式的に示す図である。図18Cは、図18Bから引き続き、積層治具400の押え部420が積層体100Sを押さえ、押え部420の積層方向Zの位置が予め定められた位置に固定された状態を模式的に示す図である。図18Dは、図18Cの状態における積層治具400の平面図である。図18Eは、図18Cから引き続き、プレス405を上昇させ、積層方向Zへの加圧を解除した状態を模式的に示す図である。図19Aおよび図19Bは、積層治具400の固定部430を示す断面図であり、図19Aは、ラチェット機構432の係止爪433がストッパピン411のロック溝431に係合した状態を示し、図19Bは、ラチェット機構432の係止爪433がストッパピン411のロック溝431から係合解除した状態を示している。
100S 積層体、
110,110A,110B,110C,110D,110E,110F,110G,110H,110I,110J 単電池、
110M 第1セルサブアッシ、
110N 第2セルサブアッシ、
111 発電要素、
112 電極タブ(端子)、
112A アノード側電極タブ、
112K カソード側電極タブ、
113 ラミネートフィルム(被覆部材)、
114 第1スペーサ、
115 第2スペーサ、
116 カラー、
117 弾性接着剤(充填部材)、
120 加圧ユニット、
121 上部加圧板、
122 下部加圧板、
123 側板、
130 バスバユニット、
131 バスバホルダ、
132 バスバ、
132A アノード側バスバ、
132K カソード側バスバ、
133 アノード側ターミナル、
134 カソード側ターミナル、
135 保護カバー、
201 測定器、
202 載置台、
203 ロケート支柱、
204 塗布器、
205,305 プレス、
206 レーザ光源、
400 積層治具、
405 プレス、
411 ストッパピン、
420 押え部、
430 固定部
431 ロック溝、
432 ラチェット機構、
433 掛止爪、
S101 測定工程、
S102 積層工程、
S103 配置工程、
S104 加圧工程、
S105 電気的経路接続工程、
L1,L2 レーザ光、
K 間隔、
D,D11,D12,D13,D21,D22 隙間、
T,T11,T12 積層時間、
P,P21,P22,P31 加圧力、
V,V11,V31,V32 充填量、
X (単電池110の)長手方向、
Y (単電池110の)短手方向、
Z (単電池110の)積層方向。
Claims (11)
- 充填部材を介して複数の単電池を積層し、積層した前記単電池を電気的に接続してなる組電池の製造方法であって、
前記単電池の厚みを測定する測定工程と、
積層方向に隣り合う前記単電池の間に、粘性を有する前記充填部材を配置する配置工程と、
前記単電池の間に配置した粘性状態の前記充填部材を、前記単電池を介して前記積層方向に加圧し、前記充填部材の前記積層方向の厚さを薄くする加圧工程と、を有し、
前記充填部材の前記積層方向の厚さを、積層後に隣り合う前記単電池の各々の測定した厚みに基づいて、前記配置工程において前記充填部材を配置する量、前記加圧工程において前記充填部材を加圧する時間の長さ、および前記加圧工程において前記充填部材を加圧する力の大きさの少なくとも1つによって制御し、前記積層方向に隣り合う2つの前記単電池の積層方向中心間の距離を一定の範囲内に収める、組電池の製造方法。 - 電力の入出力を行う端子を備えた前記単電池と、前記端子同士を電気的に接続するバスバと、を用い、
前記単電池を積層した後に前記端子と前記バスバとを接続する、請求項1に記載の組電池の製造方法。 - 前記充填部材の量を一定とし、積層後に隣り合う前記単電池の間に配置する前記充填部材を加圧する時間の長さを制御する、請求項1または2に記載の組電池の製造方法。
- 前記充填部材の量を一定とし、積層後に隣り合う前記単電池の間に配置する前記充填部材を加圧する力の大きさを制御する、請求項1または2に記載の組電池の製造方法。
- 前記充填部材を加圧する力の大きさを一定とし、積層後に隣り合う前記単電池の間に配置する前記充填部材の量を制御する、請求項1または2に記載の組電池の製造方法。
- 前記加圧工程において、前記単電池を積層した積層体を前記積層方向に移動自在な押え部によって押さえ、前記押え部の前記積層方向の位置を予め定められた位置に固定し、その後に前記積層方向への加圧を解除する、請求項1~5のいずれか1項に記載の組電池の製造方法。
- 前記充填部材の厚みの制御は、前記単電池の一定の積層数毎に行う、請求項1~6のいずれか1項に記載の組電池の製造方法。
- 前記充填部材は、前記単電池の一定の積層数毎に、積層後に隣り合う前記単電池の間に配置する、請求項1~7のいずれか1項に記載の組電池の製造方法。
- 前記積層方向に沿って隣り合う前記単電池の間において、各々の前記単電池に備えた発電要素と前記積層方向に沿って重なる領域に前記充填部材を配置する、請求項1~8のいずれか1項に記載の組電池の製造方法。
- 硬化後において弾性力を備える弾性接着剤を含む前記充填部材を用いる、請求項1~9のいずれか1項に記載の組電池の製造方法。
- 発電要素を絶縁して被覆する被覆部材を備えた前記単電池を用いる、請求項1~10のいずれか1項に記載の組電池の製造方法。
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JP2019504407A JP6748285B2 (ja) | 2017-03-07 | 2018-02-08 | 組電池の製造方法 |
US16/478,534 US10680219B2 (en) | 2017-03-07 | 2018-02-08 | Battery pack production method |
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KR20220101459A (ko) * | 2021-01-11 | 2022-07-19 | 주식회사 엘지에너지솔루션 | 화재 발생 및 폭발을 방지할 수 있는 구조를 갖는 배터리 모듈, 그리고 이를 포함하는 배터리 팩 및 자동차 |
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Also Published As
Publication number | Publication date |
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KR102110096B1 (ko) | 2020-05-12 |
EP3595032A4 (en) | 2020-03-11 |
US10680219B2 (en) | 2020-06-09 |
CN110392944A (zh) | 2019-10-29 |
US20190348650A1 (en) | 2019-11-14 |
JP6748285B2 (ja) | 2020-08-26 |
JPWO2018163708A1 (ja) | 2019-11-21 |
KR20190105121A (ko) | 2019-09-11 |
EP3595032A1 (en) | 2020-01-15 |
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