WO2015001711A1 - Power source device - Google Patents

Power source device Download PDF

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Publication number
WO2015001711A1
WO2015001711A1 PCT/JP2014/003035 JP2014003035W WO2015001711A1 WO 2015001711 A1 WO2015001711 A1 WO 2015001711A1 JP 2014003035 W JP2014003035 W JP 2014003035W WO 2015001711 A1 WO2015001711 A1 WO 2015001711A1
Authority
WO
WIPO (PCT)
Prior art keywords
positive electrode
negative electrode
battery
battery cells
power supply
Prior art date
Application number
PCT/JP2014/003035
Other languages
French (fr)
Japanese (ja)
Inventor
達人 堀内
Original Assignee
三洋電機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 三洋電機株式会社 filed Critical 三洋電機株式会社
Priority to JP2015525016A priority Critical patent/JPWO2015001711A1/en
Publication of WO2015001711A1 publication Critical patent/WO2015001711A1/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound 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
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/209—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for prismatic or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0413—Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H01M4/628—Inhibitors, e.g. gassing inhibitors, corrosion inhibitors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/30—Arrangements for facilitating escape of gases
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • 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 power supply device including a battery cell.
  • a power supply device in which a plurality of battery cells are juxtaposed and these battery cells are connected in series, parallel or series-parallel to each other.
  • Such a power supply device has a large output and is used in a hybrid electric vehicle (HEV, PHEV), an electric vehicle (EV), a large stationary power storage device, and the like.
  • the battery cell expands when the internal pressure increases.
  • a protection mechanism such as a current interruption mechanism, a forced short-circuit mechanism, and a gas discharge valve that operate when the internal pressure increases.
  • a battery in which lithium carbonate is added to a positive electrode mixture layer is known in order to operate a protection mechanism more effectively (see Patent Document 1 below).
  • Lithium carbonate decomposes and generates carbon dioxide gas when the battery cell is overcharged and the battery voltage increases. As a result, the internal pressure of the battery cell is increased, and the protection mechanism is quickly activated.
  • Patent Document 2 discloses a power supply device having a battery stack including a plurality of rectangular battery cells each having a positive electrode terminal and a negative electrode terminal provided on an upper surface thereof, and a pack case that accommodates the battery stack.
  • Patent Document 3 discloses a power supply device having a battery block including a plurality of prismatic battery cells each having a positive electrode terminal and a negative electrode terminal on an upper surface, and an outer case that houses the battery block.
  • Patent Document 4 discloses a power supply device including a battery block including a plurality of cylindrical battery cells and a casing that accommodates the battery block.
  • the rectangular battery cell disclosed in Patent Documents 2 and 3 and the cylindrical battery cell disclosed in Patent Document 4 are both flattened in which a positive electrode and a negative electrode are wound in a mutually insulated state via a separator.
  • a spirally wound electrode body is provided.
  • the power supply devices disclosed in Patent Documents 2 to 4 are arranged so that the winding axis of the wound electrode body is in the horizontal direction regardless of whether it is a rectangular battery cell or a cylindrical battery cell. Has been.
  • the wound electrode body is tightly wound to ensure battery capacity.
  • the path (path) of the gas is limited. Therefore, the gas generated in the wound electrode body is likely to be trapped in a part of the wound electrode body, and the operation of the protection mechanism that is activated by the battery internal pressure is delayed.
  • the power supply device of one aspect of the present invention since the fluidity of the gas in the battery cell is good, a power supply device that can quickly activate the protection mechanism that is activated by the battery internal pressure is provided.
  • a power supply device includes: A positive electrode including a positive electrode mixture layer, a negative electrode including a negative electrode mixture layer, a wound electrode body wound in a state where the positive electrode and the negative electrode are insulated from each other via a separator, a battery exterior body, and an increase in internal pressure
  • a plurality of battery cells comprising a protection mechanism that operates and ensures safety
  • the positive electrode mixture layer includes lithium carbonate
  • the plurality of battery cells are juxtaposed such that the winding axis of the wound electrode body is substantially vertical.
  • the fluidity of the gas in the wound electrode body is improved, so that the internal pressure rises suddenly when gas is generated in the wound electrode body, and it operates according to the battery internal pressure.
  • the protection mechanism can be activated quickly.
  • FIG. 5A is a front view of a battery cell used in the power supply device of one embodiment of the present invention
  • FIG. 5B is a side view of the same.
  • 6A is a sectional view taken along line VIA-VIA in FIG. 5A
  • FIG. 6B is a sectional view taken along line VIB-VIB in FIG. 6A
  • FIG. 6C is a sectional view taken along line VIC-VIC in FIG.
  • the following embodiment shows an example for embodying the technical idea of the present invention, and is not intended to limit the present invention to any of these embodiments.
  • the present invention can be equally applied to various modifications without departing from the technical idea shown in the claims.
  • the directions of “front and rear, up and down, left and right” are shown for convenience of explanation, and are not limited to these directions.
  • the “substantially vertical direction” in this specification is preferably a direction perpendicular to the horizontal plane, but does not necessarily have to be completely perpendicular, and includes a range that is considered to be substantially perpendicular to the horizontal plane. It is used in.
  • the power supply device 2 includes an exterior case 102 as an exterior body, and a plurality of battery blocks 4 and a battery control device 6 are accommodated in the exterior case 102.
  • the exterior case 102 includes a base plate 104, a cover plate 106 disposed above the base plate 104, and two side plates 108 respectively provided on the sides (left and right) of the base plate 104.
  • the base plate 104 includes a base portion 104a on which the battery block 4 and the battery control device 6 are placed, and a first base plate 104 formed so as to extend upward from the front end of the base portion 104a.
  • the side wall portion 104b, the first connecting portion 104c formed so as to extend in the horizontal direction from the upper portion of the first side wall portion 104b, and formed so as to extend upward from the rear end of the base portion 104a. It has the 2nd side wall part 104d and the 2nd connection part 104e formed so that it might extend in the horizontal direction from the upper part of this 2nd side wall part 104d.
  • a fixing member 110 that fixes the battery block 4 is provided on the upper portion of the base portion 104a.
  • the base plate 104 is produced, for example, by pressing a metal plate into a groove shape.
  • the cover plate 106 includes a first cover portion 112 that covers the battery block 4 and a second cover portion 114 that covers the battery control device 6.
  • the first cover portion 112 has a length in the front-rear direction that is smaller than the base plate 104.
  • the first cover portion 112 covers the plurality of battery blocks 4 and divides a space in which these battery blocks 4 are arranged from a space in which the battery control device 6 is arranged.
  • the first cover portion 112 includes a top plate portion 112a disposed above the battery block 4, a side wall portion 112b formed to extend downward from the front end of the top plate portion 112a, and the side wall portion 112b. From the 1st connection part 112c formed so that it may extend in the horizontal direction from the lower part, the 2nd connection part 112d formed in the rear end of the top-plate part 112a, and the rear end of this 2nd connection part 112d The partition wall 112e is formed to extend toward the base plate 104. A fixing member 116 for fixing the battery block 4 is provided below the top plate portion 112a.
  • the first cover part 112 is produced, for example, by pressing a metal plate into a groove shape.
  • the second cover portion 114 has a length in the front-rear direction that is smaller than that of the base plate 104.
  • the second cover portion 114 includes a top plate portion 114a disposed above the battery control device 6, a side wall portion 114b formed to extend downward from the rear end of the top plate portion 114a, and the side wall portion.
  • the first connecting portion 114c is formed to extend in the horizontal direction from the lower portion of 114b, and the second connecting portion 114d is formed at the front end of the top plate portion 114a.
  • the second cover part 114 is produced, for example, by pressing a metal plate into an L shape.
  • the first connecting part 104 c of the base plate 104 and the first connecting part 112 c of the first cover part 112 are connected by a connecting member 122 through a sealing member 120.
  • the sealing member 120 maintains a sealing property between the first connecting portion 104c of the base plate 104 and the first connecting portion 112c of the first cover portion 112, and for example, packing is used.
  • the connecting member 122 for example, a bolt and a nut are used.
  • the second connecting portion 104 e of the base plate 104 and the first connecting portion 114 c of the second cover portion 112 are connected by a connecting member 122 through a sealing member 120.
  • the second connecting portion 112d of the first cover portion 112 and the second connecting portion 114d of the second cover portion 114 are arranged via the sealing member 120 so that the second connecting portion 114d is on the upper side. They are connected by a connecting member 122.
  • the base plate 104, the first cover part 112, and the second cover part 114 are formed of, for example, a metal plate such as iron, iron alloy, aluminum, or aluminum alloy whose surface is plated or painted.
  • the second cover portion 114 may be formed by aluminum die casting from the viewpoint of formability and heat dissipation.
  • the thickness of the base plate 104 may be the same as that of the first cover portion 112 or may be thicker than the first cover portion 112.
  • the side plate 108 is a plate-like member, and a groove 108a extending in the front-rear direction is formed in the lower part thereof.
  • the groove portion 108 a is provided with a sealing member 120, and the left and right end portions of the base plate 104 are fitted into the groove portion 108 a through the sealing member 120.
  • the left and right end portions of the cover plate 106 are arranged on the upper portion of the side plate 108 via the sealing member 120.
  • the side plate 108 is fixed by a fixing member 110 of the base plate 104, a fixing member 116 of the cover plate 106, and a connecting member 122.
  • the exterior case 102 has a sealed structure.
  • a first storage portion 124 that is surrounded by the base plate 104, the side plate 108, and the first cover portion 112 and stores the battery block 4, and the base plate 104, the side plate 108, and the second cover portion 114 are stored.
  • a second storage portion 126 for storing the battery control device 6 is formed.
  • the battery block 4 is fixed to the base plate 104, the first cover part 112, and the side plate 108.
  • a cooling duct 128 that cools the battery block 4 is provided in the first storage portion 124 so as to pass between the plurality of battery blocks 4.
  • the battery block 4 includes a plurality of rectangular battery cells 12, a plurality of spacers 14, two end spacers 16, two end plates 18, and a bind bar 20.
  • the plurality of prismatic battery cells 12 are juxtaposed (arranged in the left-right direction in FIG. 4), and the spacer 14 is disposed so as to be sandwiched between two adjacent prismatic battery cells 12.
  • the end spacer 16 is disposed outside the rectangular battery cell 12 disposed at the end in the juxtaposition direction.
  • the end plate 18 is disposed outside the end spacer 16 in the juxtaposition direction, and sandwiches the prismatic battery cell 12, the spacer 14, and the end spacer 16.
  • the bind bar 20 is connected to the end plate 18 to fix the prismatic battery cell 12, the spacer 14, and the end spacer 16 so as to pressurize them in the juxtaposition direction.
  • Adjacent rectangular battery cells 12 are electrically connected via a bus bar 22.
  • the spacer 14 insulates the plurality of prismatic battery cells 12 and prevents the prismatic battery cells 12 from short-circuiting.
  • the spacer 14 has an outer shape (surface aligned in the juxtaposition direction) of the same size as the prismatic battery cell 12.
  • the spacer 14 has an insulating property and is designed to have a strength that does not damage even if it is sandwiched between the rectangular battery cells 12 and the like.
  • the spacer 14 is formed of, for example, nylon resin, epoxy resin, plastic such as polyethylene terephthalate, or the like.
  • the end spacer 16 is configured in the same manner as the spacer 14.
  • the length (thickness) in the left-right direction of the end spacer 16 may be the same as that of the spacer 14 or may be changed as appropriate.
  • the end plate 18 has a rectangular parallelepiped shape whose outer shape (surface aligned in the juxtaposition direction) is about the same size as the prismatic battery cell 12, and is formed of a relatively high strength metal such as aluminum or aluminum alloy, or hard plastic. Has been.
  • the end plate 18 may have an outer shape larger than that of the square battery cell 12.
  • the bind bar 20 is formed of a relatively strong metal plate such as a stainless steel plate or a steel plate.
  • the bind bar 20 may have a shape in which an end portion in the left-right direction is bent. Thereby, compared with the case where this structure is not provided, fastening strength improves.
  • the battery control device 6 is electrically connected to the rectangular battery cell 12 of the battery block 4 and controls the operation of the rectangular battery cell 12. Specifically, the battery control device 6 detects the state of the voltage, current, remaining capacity, temperature, etc. of the rectangular battery cell 12, and controls charging / discharging of the rectangular battery cell 12 based on this.
  • the battery control device 6 performs charge / discharge control by detecting the voltage of the prismatic battery cell 12
  • the charging current is limited and discharged when the voltage of the prismatic battery cell 12 becomes higher than a predetermined maximum charging voltage during charging.
  • the discharge current is limited when the voltage of the rectangular battery cell 12 becomes lower than a predetermined minimum discharge voltage. In this way, overcharge and overdischarge of the rectangular battery cell 12 are prevented.
  • the battery control device 6 when the battery control device 6 performs charge / discharge control by detecting the charge / discharge current of the prismatic battery cell 12, the current is cut off when a current of a predetermined value or more flows through the prismatic battery cell 12.
  • the battery control device 6 detects the remaining capacity of the prismatic battery cell 12 and performs charge / discharge control, if the remaining capacity of the prismatic battery cell 12 exceeds a predetermined maximum value during charging, the charging current is limited and discharged. Sometimes the discharge current is limited when the remaining capacity of the rectangular battery cell 12 becomes smaller than a predetermined minimum value.
  • the battery control device 6 can also perform charge / discharge control by detecting the temperature of the rectangular battery cell 12.
  • the prismatic battery cell 12 is, for example, a prismatic nonaqueous electrolyte secondary battery, and includes a rectangular parallelepiped exterior body 30 and a sealing body 32.
  • the exterior body 30 has two wide surfaces facing in the left-right direction (hereinafter referred to as “wide surface 30a”) and two narrow surfaces facing in the vertical direction (hereinafter referred to as “narrow surface 30b”). And a side surface 30c located at the rear, and the front is open.
  • the sealing body 32 is arrange
  • the exterior body 30 and the sealing body 32 are laser welded, and the inside of the rectangular battery cell 12 is sealed.
  • a positive electrode terminal 34 is fixed to the sealing body 32 via an insulating member 36, and a negative electrode terminal 38 is fixed via an insulating member 40.
  • the bus bar 22 (see FIG. 4) is connected to the positive terminal 34 and the negative terminal 38.
  • the exterior body 30, the sealing body 32, and the positive electrode terminal 34 are each formed of aluminum or an aluminum alloy, and the negative electrode terminal 38 is formed of copper or a copper alloy.
  • the sealing body 32 is provided with a liquid injection port 42 for injecting an electrolytic solution and a gas discharge valve 44.
  • the gas discharge valve 44 discharges the gas in the prismatic battery cell 12 to the outside when the pressure in the prismatic battery cell 12 exceeds a predetermined pressure.
  • a sheet-like insulating sheet 46 made of resin is disposed inside the exterior body 30, and a flat wound electrode body 50 is disposed inside the insulating sheet 46.
  • the flat wound electrode body 50 includes a positive electrode plate 52, a negative electrode plate 54, and a separator 56.
  • the positive electrode plate 52 and the negative electrode plate 54 are wound in a flat shape in a state where they are insulated from each other via the separator 56. It has a rotated configuration.
  • the flat wound electrode body 50 is wound so that the outermost periphery is the separator 56 and the inner side is the negative electrode plate 54 and the inner side is the positive electrode plate 52 in that order.
  • As the separator 56 for example, a microporous film made of polyolefin is used.
  • Gas is easier to move in the vertical direction than in the horizontal direction due to its nature.
  • the flat spirally wound electrode body 50 When gas is generated in the flat spirally wound electrode body 50, if the winding axis of the flat spirally wound electrode body 50 is arranged in the horizontal direction, the flat spirally wound electrode body 50 has an inside. Gas tends to accumulate.
  • the winding axis of the flat wound electrode body 50 is arranged so as to be inclined with respect to the horizontal direction, compared to the case where the winding axis is arranged so as to be in the horizontal direction. The gas can easily escape to the outside of the flat wound electrode body 50.
  • the winding axis of the flat wound electrode body 50 is disposed so as to be substantially vertical from the horizontal direction, and is substantially the same as the surface of the sealing body 32 provided with the positive electrode terminal 34 and the negative electrode terminal 38. It is parallel.
  • the positive electrode terminal 34 and the negative electrode terminal 38 are arranged on one surface parallel to the winding axis of the flat wound electrode body 50 so as to be separated in the winding axis direction.
  • the rectangular battery cells 12 are arranged so that the sealing body 34 is on the front side. Thereby, the gas generated in the flat spirally wound electrode body 50 is likely to move outward (upward in FIGS. 5B and 6A).
  • the angle of the winding axis of the flat wound electrode body 50 with respect to the horizontal plane is about ⁇ 20 ° with respect to the vertical direction, preferably ⁇ 10 °, and more preferably ⁇ 5 °.
  • the positive electrode plate 52 is formed with a positive electrode mixture layer applied to both surfaces of the positive electrode core and a positive electrode core exposed portion 58.
  • the positive electrode core exposed portion 58 is a portion where the positive electrode mixture is not applied, and is a portion where the positive electrode core is exposed in a strip shape in the winding direction of the flat wound electrode body 50.
  • the positive electrode core is made of, for example, aluminum or an aluminum alloy and has a thickness of about 10 to 20 ⁇ m.
  • the negative electrode plate 54 is formed with a negative electrode mixture layer applied to both surfaces of the negative electrode core and a negative electrode core exposed portion 60.
  • the negative electrode core exposed portion 60 is a portion where the negative electrode mixture is not applied, and is a portion where the negative electrode core is exposed in a strip shape in the winding direction of the flat wound electrode body 50.
  • the formation range (width and length) of the negative electrode mixture layer is larger than the range of the positive electrode mixture layer.
  • the negative electrode core is made of, for example, copper or copper alloy, and has a thickness of about 5 to 15 ⁇ m.
  • the flat wound electrode body 50 is arranged so that a plurality of the positive electrode core exposed portions 58 overlap on one end side (upper side in FIG. 6A), and the negative electrode core exposed portion 60 on the other end side (same as the lower side). It is the structure arrange
  • the positive electrode plate 52 and the negative electrode plate 54 are arranged so that the positive electrode core exposed portion 58 does not overlap the layer coated with the negative electrode active material mixture, and the negative electrode core exposed portion 60 is coated with the positive electrode mixture. It is arranged so that it does not overlap with other layers.
  • a positive electrode current collector 62 made of aluminum or an aluminum alloy is provided outside the positive electrode core exposed portion 58.
  • the plurality of positive electrode core exposed portions 58 wound and laminated are converged at the center in the thickness direction and further divided into two, and the positive electrode core is centered on 1/4 of the thickness of the flat wound electrode body 50.
  • the body exposed portion 58 is converged, and the positive electrode intermediate member 64 is disposed therebetween.
  • the positive electrode intermediate member 64 holds a plurality of conductive positive electrode conductive members 66, here two, on a base made of a resin material.
  • the positive electrode conductive member 66 has a columnar shape, and a truncated cone-shaped protrusion 68 that acts as a projection is formed on the side facing each of the stacked positive electrode core exposed portions 58.
  • the positive electrode core exposed portion 58 is electrically connected to the positive electrode terminal 34 via the positive electrode current collector 62.
  • a current interruption mechanism 70 is provided between the positive electrode current collector 62 and the positive electrode terminal 34.
  • the current interruption mechanism 70 operates so as to cut off the current when the inside of the rectangular battery cell 12 becomes equal to or higher than a predetermined pressure.
  • the electric current interruption mechanism 70 operates at a pressure lower than the pressure at which the gas discharge valve 44 operates.
  • the current interrupt mechanism 70 and the gas discharge valve 44 function as a protection mechanism that operates by increasing the internal pressure and ensures the safety of the power supply device 10 and the like.
  • a negative electrode current collector 72 formed of copper or a copper alloy is provided outside the negative electrode core exposed portion 60.
  • the plurality of negative electrode core exposed portions 60 wound and laminated are converged and further divided on the center side in the thickness direction, and the negative electrode core body is centered on 1/4 of the thickness of the flat wound electrode body 50.
  • the exposed portion 60 is converged, and the negative electrode intermediate member 74 is disposed therebetween.
  • the negative electrode intermediate member 74 holds a plurality of, here two, negative electrode conductive members 76 on a base made of a resin material.
  • the negative electrode conductive member 76 has a columnar shape, and a truncated cone-shaped projection 78 that acts as a projection is formed on the side facing each of the laminated negative electrode core exposed portions.
  • the negative electrode core exposed portion 60 is electrically connected to the negative electrode terminal 38 via the negative electrode current collector 72.
  • the positive electrode plate 52 for example, one produced as follows is used.
  • a lithium nickel cobalt manganese composite oxide represented by LiNi 0.35 Co 0.35 Mn 0.30 O 2 is used.
  • Lithium nickel cobalt manganese composite oxide, carbon powder as a conductive agent, and polyvinylidene fluoride (PVd) as a binder The positive electrode mixture containing F) and lithium carbonate is mixed with N-methyl-2-pyrrolidone (NMP) as a dispersion medium to prepare a positive electrode slurry.
  • NMP N-methyl-2-pyrrolidone
  • the lithium nickel cobalt manganese composite oxide, carbon powder, and PVdF are contained so as to have a mass ratio of 88: 9: 3, respectively.
  • Lithium carbonate is preferably contained in an amount of 0.1 to 5.0% by mass with respect to the positive electrode mixture.
  • the content of lithium carbonate in the positive electrode mixture is less than 0.1% by mass, the generation of carbon dioxide from the lithium carbonate is small and it is difficult to quickly activate the protection mechanism.
  • the content of lithium carbonate in the positive electrode mixture exceeds 5.0% by mass, the proportion of lithium carbonate not involved in the electrode reaction is excessively increased, and the battery capacity is greatly reduced.
  • the positive electrode slurry is applied to both surfaces of the positive electrode core with a die coater to form a positive electrode mixture layer on both surfaces of the positive electrode core. Next, it is dried to remove NMP, and compressed to a predetermined thickness by a roll press. After cutting out to a predetermined dimension, a part of the positive electrode mixture layer is removed so as to form the positive electrode core body exposed portion 58 over the entire length direction (winding direction) on one end side in the width direction.
  • the negative electrode plate 54 for example, one produced as follows is used. A negative electrode slurry containing graphite powder, carboxymethyl cellulose (CMC) as a thickener, and styrene-butadiene rubber (SBR) as a binder is dispersed in water to prepare a negative electrode slurry.
  • the graphite powder, CMC, and SBR are contained so as to have a mass ratio of 98: 1: 1, respectively.
  • the negative electrode slurry is applied to both surfaces of the negative electrode core by a die coater, and a negative electrode mixture layer is formed on both surfaces of the negative electrode core. Subsequently, it compresses so that it may become predetermined thickness using a compression roller. After cutting out to a fixed dimension, a part of negative electrode mixture layer is removed so that the negative electrode core exposed part 60 covering the whole length direction (winding direction) may be formed in the one end side of the width direction.
  • non-aqueous electrolytic solution for example, one prepared as follows is used. LiPF 6 as an electrolyte salt is added to a mixed solvent in which ethylene carbonate (EC) and methyl ethyl carbonate (MEC) are mixed at a volume ratio (25 ° C., 1 atm) in a ratio of 3: 7 so as to be 1 mol / L. To do.
  • EC ethylene carbonate
  • MEC methyl ethyl carbonate
  • the square battery cell 12 is produced as follows, for example.
  • the positive electrode plate 52 and the negative electrode plate 54 are wound so that they are insulated from each other via the separator 56 so that the outermost surface becomes the negative electrode plate 54, and then are formed into a flat shape to form a flat wound electrode body. 50 is produced.
  • the sealing body 32 is fitted into the opening of the exterior body 30, and laser welding is performed between the exterior body 30 and the sealing body 32.
  • a predetermined amount of nonaqueous electrolytic solution is injected from the injection port 42. Then, the liquid injection port 42 is sealed with a blind rivet.
  • the rectangular battery cells 12 are arranged such that the winding axis of the flat wound electrode body 50 is in a substantially vertical direction. For this reason, since the fluidity of the gas in the flat wound electrode body 50 is improved, the gas generated in the flat wound electrode body 50 is suppressed from staying inside the flat wound electrode body 50. As a result, the internal pressure of the rectangular battery cell 12 increases suddenly, and the current interrupt mechanism 70 can be operated quickly.
  • the present invention has a predetermined effect as long as the winding axes of the plurality of wound electrode bodies are arranged in parallel so as to be in the substantially vertical direction. Therefore, the present invention can be equally applied to a cylindrical battery cell including a wound electrode body.
  • the power supply device 10 can be suitably used for an electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, and the like. Moreover, and backup power supply devices mounted on the computer server rack, mobile phones Bas Tsu up power supply for a radio base station, the power storage power supply device for home or factory, such as the power storage device in combination with a solar cell applications It can also be used.

Abstract

Provided is a power source device that can prevent a drop in the fluidity of gas inside a battery cell and that can cause a protection mechanism that operates in a case where the internal pressure of a battery cell rises to operate promptly. A power source device (2) of one embodiment of the present invention has an outer case, a gas exhaust valve that operates according to pressure to ensure safety, a current shutoff mechanism, a flat wound electrode, and triangular battery cells (12) contained inside the outer case. The triangular battery cells (12) inside the power source device (2) include lithium carbonate on a cathode mixture layer, and are arranged such that the winding axes of the flat wound electrodes are in an approximately vertical direction.

Description

電源装置Power supply
　本発明は、電池セルを備えた電源装置に関する。 The present invention relates to a power supply device including a battery cell.
　複数個の電池セルを並置し、これらの電池セルを互いに直列、並列又は直並列に接続した電源装置がある。このような電源装置は、出力が大きく、ハイブリッド電気自動車（ＨＥＶ、ＰＨＥＶ）や電気自動車（ＥＶ）、大型の定置用蓄電装置等に用いられている。 There is a power supply device in which a plurality of battery cells are juxtaposed and these battery cells are connected in series, parallel or series-parallel to each other. Such a power supply device has a large output and is used in a hybrid electric vehicle (HEV, PHEV), an electric vehicle (EV), a large stationary power storage device, and the like.
　電池セルは、内圧が上昇すると膨張する。電池セルに異常が発生して内圧が大きく上昇した場合、電池セルが破損し、周囲を損傷する等の不具合を生じることが想定される。このような不具合に対処するために、電池セルには、内圧が上昇した場合に作動する電流遮断機構、強制短絡機構、ガス排出弁等の保護機構が設けられているものがある。特に非水電解質二次電池においては、保護機構をより効果的に作動させるようにするため、正極合剤層中に炭酸リチウムを添加したものが知られている（下記特許文献１参照）。
　炭酸リチウムは、電池セルが過充電状態となって電池電圧が高くなった場合に分解して炭酸ガスを発生させる。これにより電池セルの内圧を上昇させ、迅速に保護機構を作動させる。 The battery cell expands when the internal pressure increases. When an abnormality occurs in the battery cell and the internal pressure rises greatly, it is assumed that the battery cell is broken and a defect such as damage to the surroundings occurs. In order to deal with such a problem, some battery cells are provided with a protection mechanism such as a current interruption mechanism, a forced short-circuit mechanism, and a gas discharge valve that operate when the internal pressure increases. In particular, in a nonaqueous electrolyte secondary battery, a battery in which lithium carbonate is added to a positive electrode mixture layer is known in order to operate a protection mechanism more effectively (see Patent Document 1 below).
Lithium carbonate decomposes and generates carbon dioxide gas when the battery cell is overcharged and the battery voltage increases. As a result, the internal pressure of the battery cell is increased, and the protection mechanism is quickly activated.
　特許文献２には、上面に正極端子および負極端子が設けられている角形電池セルを複数個備える電池スタックと、この電池スタックを収容するパックケースとを有する電源装置が開示されている。特許文献３には、上面に正極端子および負極端子が設けられている角形電池セルを複数個備える電池ブロックと、この電池ブロックを収容するアウターケースとを有する電源装置が開示されている。特許文献４には、円筒形電池セルを複数個備える電池ブロックと、この電池ブロックを収容するケーシングとを備える電源装置が開示されている。 Patent Document 2 discloses a power supply device having a battery stack including a plurality of rectangular battery cells each having a positive electrode terminal and a negative electrode terminal provided on an upper surface thereof, and a pack case that accommodates the battery stack. Patent Document 3 discloses a power supply device having a battery block including a plurality of prismatic battery cells each having a positive electrode terminal and a negative electrode terminal on an upper surface, and an outer case that houses the battery block. Patent Document 4 discloses a power supply device including a battery block including a plurality of cylindrical battery cells and a casing that accommodates the battery block.
特開平０４－３２８２７８号公報Japanese Patent Laid-Open No. 04-328278 特開２０１２－０５４０５２号公報JP 2012-054052 A 特開２０１３－０２５９８３号公報JP 2013-025983 A 特開２０１２－０７４３５０号公報JP 2012-074350 A
　特許文献２及び３に開示されている角形電池セル及び特許文献４に開示されている円筒形電池セルは、いずれも正極と負極とをセパレータを介して互いに絶縁された状態で巻回された偏平状の巻回電極体を備えている。特許文献２～４に開示されている電源装置では、角形電池セルの場合であっても円筒形電池セルの場合であっても、巻回電極体の巻回軸が水平方向となるように配置されている。 The rectangular battery cell disclosed in Patent Documents 2 and 3 and the cylindrical battery cell disclosed in Patent Document 4 are both flattened in which a positive electrode and a negative electrode are wound in a mutually insulated state via a separator. A spirally wound electrode body is provided. The power supply devices disclosed in Patent Documents 2 to 4 are arranged so that the winding axis of the wound electrode body is in the horizontal direction regardless of whether it is a rectangular battery cell or a cylindrical battery cell. Has been.
　巻回電極体は電池容量の確保のために密に巻回される。巻回電極体の巻回軸が水平方向となるように配置されている電池セルでは、ガスが発生した場合にそのガスの経路（通り道）が制限される。そのため、巻回電極体内で発生したガスがこの巻回電極体内の一部にこもり易くなり、電池内圧によって作動する保護機構の作動が遅延する。 The wound electrode body is tightly wound to ensure battery capacity. In the battery cell arranged so that the winding axis of the wound electrode body is in the horizontal direction, when gas is generated, the path (path) of the gas is limited. Therefore, the gas generated in the wound electrode body is likely to be trapped in a part of the wound electrode body, and the operation of the protection mechanism that is activated by the battery internal pressure is delayed.
　本発明の一局面の電源装置によれば、電池セル内でのガスの流動性が良好であるため、電池内圧によって作動する保護機構を迅速に作動させることができる電源装置が提供される。 According to the power supply device of one aspect of the present invention, since the fluidity of the gas in the battery cell is good, a power supply device that can quickly activate the protection mechanism that is activated by the battery internal pressure is provided.
　本発明の一局面の電源装置は、
　正極合剤層を含む正極と、負極合剤層を含む負極と、前記正極及び前記負極をセパレータを介して互いに絶縁した状態で巻回した巻回電極体と、電池外装体と、内圧の上昇によって作動して安全性を確保する保護機構と、を備える複数個の電池セルを有し、
　前記正極合剤層は、炭酸リチウムを含み、
　前記複数個の電池セルは、それぞれが前記巻回電極体の巻回軸が略鉛直方向となるように並置されている。 A power supply device according to one aspect of the present invention includes:
A positive electrode including a positive electrode mixture layer, a negative electrode including a negative electrode mixture layer, a wound electrode body wound in a state where the positive electrode and the negative electrode are insulated from each other via a separator, a battery exterior body, and an increase in internal pressure A plurality of battery cells comprising a protection mechanism that operates and ensures safety,
The positive electrode mixture layer includes lithium carbonate,
The plurality of battery cells are juxtaposed such that the winding axis of the wound electrode body is substantially vertical.
　本発明の一局面の電源装置によれば、巻回電極体内でのガスの流動性が良好になるので、巻回電極体内でガスが発生した場合の内圧上昇が急となり、電池内圧によって作動する保護機構を迅速に作動させることができる。 According to the power supply device of one aspect of the present invention, the fluidity of the gas in the wound electrode body is improved, so that the internal pressure rises suddenly when gas is generated in the wound electrode body, and it operates according to the battery internal pressure. The protection mechanism can be activated quickly.
本発明の一実施形態の電源装置の斜視図である。It is a perspective view of the power supply device of one Embodiment of this invention. 本発明の一実施形態の電源装置の平面図である。It is a top view of the power supply device of one embodiment of the present invention. 図３Ａは図２のIIIＡ－IIIＡ線に沿った断面図であり、図３Ｂは図２のIIIＢ－IIIＢ線に沿った断面図である。3A is a cross-sectional view taken along line IIIA-IIIA in FIG. 2, and FIG. 3B is a cross-sectional view taken along line IIIB-IIIB in FIG. 本発明の一実施形態の電池ブロック、電池制御装置及びその周辺構造を斜視した概略図である。It is the schematic which looked at the battery block of one Embodiment of this invention, the battery control apparatus, and its periphery structure. 図５Ａは本発明の一実施形態の電源装置で用いられる電池セルの正面図であり、図５Ｂは同じく側面図である。FIG. 5A is a front view of a battery cell used in the power supply device of one embodiment of the present invention, and FIG. 5B is a side view of the same. 図６Ａは図５ＡのVIＡ－VIＡ線に沿った断面図であり、図６Ｂは図６ＡのVIＢ－VIＢ線に沿った断面図であり、図６Ｃは図６ＡのVIＣ－VIＣ線に沿った断面図である。6A is a sectional view taken along line VIA-VIA in FIG. 5A, FIG. 6B is a sectional view taken along line VIB-VIB in FIG. 6A, and FIG. 6C is a sectional view taken along line VIC-VIC in FIG. FIG.
　以下、本発明を実施するための形態について説明する。以下に示す実施形態は、本発明の技術思想を具体化するための一例を示すものであって、本発明をこれらの実施形態のいずれかに限定することを意図するものではない。本発明は、特許請求の範囲に示した技術思想を逸脱することなく種々の変更を行ったものにも均しく適用できるものである。
　また、以下の説明において、「前後上下左右」の方向は説明のために便宜的に示したものであり、その方向に限定されるものではない。この明細書における「略鉛直方向」とは、水平面に対して直角な方向が望ましいが、必ずしも完全に直角な方向である必要はなく、水平面に対して実質的に直角と見なされる範囲も含む意味で用いられている。 Hereinafter, modes for carrying out the present invention will be described. The following embodiment shows an example for embodying the technical idea of the present invention, and is not intended to limit the present invention to any of these embodiments. The present invention can be equally applied to various modifications without departing from the technical idea shown in the claims.
In the following description, the directions of “front and rear, up and down, left and right” are shown for convenience of explanation, and are not limited to these directions. The “substantially vertical direction” in this specification is preferably a direction perpendicular to the horizontal plane, but does not necessarily have to be completely perpendicular, and includes a range that is considered to be substantially perpendicular to the horizontal plane. It is used in.
　一実施形態に係る電源装置２について、図１～図３を用いて説明する。
　電源装置２は外装体としての外装ケース１０２を備え、この外装ケース１０２の内部に複数の電池ブロック４と、電池制御装置６とが収容されている。 A power supply device 2 according to an embodiment will be described with reference to FIGS.
The power supply device 2 includes an exterior case 102 as an exterior body, and a plurality of battery blocks 4 and a battery control device 6 are accommodated in the exterior case 102.
　外装ケース１０２は、ベースプレート１０４と、このベースプレート１０４の上方に配置されたカバープレート１０６と、ベースプレート１０４の側方（左右）にそれぞれ設けられた二つのサイドプレート１０８とを備える。 The exterior case 102 includes a base plate 104, a cover plate 106 disposed above the base plate 104, and two side plates 108 respectively provided on the sides (left and right) of the base plate 104.
　図３Ａに示すように、ベースプレート１０４は、電池ブロック４及び電池制御装置６が載置される基台部１０４ａと、この基台部１０４ａの前端から上方に延びるようにして形成された第一の側壁部１０４ｂと、この第一の側壁部１０４ｂの上部から水平方向に延びるようにして形成された第一の連結部１０４ｃと、基台部１０４ａの後端から上方に延びるようにして形成された第二の側壁部１０４ｄと、この第二の側壁部１０４ｄの上部から水平方向に延びるようにして形成された第二の連結部１０４ｅと、を有している。
　基台部１０４ａの上部には、電池ブロック４を固定する固定部材１１０が設けられている。
　ベースプレート１０４は、例えば金属プレートを溝型にプレス加工することにより作製される。 As shown in FIG. 3A, the base plate 104 includes a base portion 104a on which the battery block 4 and the battery control device 6 are placed, and a first base plate 104 formed so as to extend upward from the front end of the base portion 104a. The side wall portion 104b, the first connecting portion 104c formed so as to extend in the horizontal direction from the upper portion of the first side wall portion 104b, and formed so as to extend upward from the rear end of the base portion 104a. It has the 2nd side wall part 104d and the 2nd connection part 104e formed so that it might extend in the horizontal direction from the upper part of this 2nd side wall part 104d.
A fixing member 110 that fixes the battery block 4 is provided on the upper portion of the base portion 104a.
The base plate 104 is produced, for example, by pressing a metal plate into a groove shape.
　カバープレート１０６は、電池ブロック４を覆う第一のカバー部１１２と、電池制御装置６を覆う第二のカバー部１１４とにより構成される。 The cover plate 106 includes a first cover portion 112 that covers the battery block 4 and a second cover portion 114 that covers the battery control device 6.
　第一のカバー部１１２は、前後方向の長さがベースプレート１０４よりも小さくなっている。第一のカバー部１１２は、複数の電池ブロック４を覆うとともに、これらの電池ブロック４が配置される空間と、電池制御装置６が配置される空間とを区切るようになっている。 The first cover portion 112 has a length in the front-rear direction that is smaller than the base plate 104. The first cover portion 112 covers the plurality of battery blocks 4 and divides a space in which these battery blocks 4 are arranged from a space in which the battery control device 6 is arranged.
　第一のカバー部１１２は、電池ブロック４の上方に配置される天板部１１２ａと、この天板部１１２ａの前端から下方に延びるようにして形成された側壁部１１２ｂと、この側壁部１１２ｂの下部から水平方向に延びるようにして形成された第一の連結部１１２ｃと、天板部１１２ａの後端に形成された第二の連結部１１２ｄと、この第二の連結部１１２ｄの後端からベースプレート１０４に向けて延びるようにして形成された隔壁部１１２ｅとにより構成される。
　天板部１１２ａの下部には、電池ブロック４を固定する固定部材１１６が設けられている。
　第一のカバー部１１２は、例えば金属プレートを溝型にプレス加工することにより作製される。 The first cover portion 112 includes a top plate portion 112a disposed above the battery block 4, a side wall portion 112b formed to extend downward from the front end of the top plate portion 112a, and the side wall portion 112b. From the 1st connection part 112c formed so that it may extend in the horizontal direction from the lower part, the 2nd connection part 112d formed in the rear end of the top-plate part 112a, and the rear end of this 2nd connection part 112d The partition wall 112e is formed to extend toward the base plate 104.
A fixing member 116 for fixing the battery block 4 is provided below the top plate portion 112a.
The first cover part 112 is produced, for example, by pressing a metal plate into a groove shape.
　第二のカバー部１１４は、前後方向の長さがベースプレート１０４よりも小さくなっている。
　第二のカバー部１１４は、電池制御装置６の上方に配置される天板部１１４ａと、この天板部１１４ａの後端から下方に延びるようにして形成された側壁部１１４ｂと、この側壁部１１４ｂの下部から水平方向に延びるようにして形成された第一の連結部１１４ｃと、天板部１１４ａの前端に形成された第二の連結部１１４ｄとにより構成される。
　第二のカバー部１１４は、例えば金属プレートをＬ字状にプレス加工することにより作製される。 The second cover portion 114 has a length in the front-rear direction that is smaller than that of the base plate 104.
The second cover portion 114 includes a top plate portion 114a disposed above the battery control device 6, a side wall portion 114b formed to extend downward from the rear end of the top plate portion 114a, and the side wall portion. The first connecting portion 114c is formed to extend in the horizontal direction from the lower portion of 114b, and the second connecting portion 114d is formed at the front end of the top plate portion 114a.
The second cover part 114 is produced, for example, by pressing a metal plate into an L shape.
　ベースプレート１０４の第一の連結部１０４ｃと第一のカバー部１１２の第一の連結部１１２ｃとは、密閉部材１２０を介して連結部材１２２によって連結されている。密閉部材１２０は、ベースプレート１０４の第一の連結部１０４ｃと第一のカバー部１１２の第一の連結部１１２ｃとの間の密閉性を保つものであり、例えばパッキン等が用いられる。連結部材１２２としては、例えばボルト及びナット等が用いられる。 The first connecting part 104 c of the base plate 104 and the first connecting part 112 c of the first cover part 112 are connected by a connecting member 122 through a sealing member 120. The sealing member 120 maintains a sealing property between the first connecting portion 104c of the base plate 104 and the first connecting portion 112c of the first cover portion 112, and for example, packing is used. As the connecting member 122, for example, a bolt and a nut are used.
　ベースプレート１０４の第二の連結部１０４ｅと第二のカバー部１１２の第一の連結部１１４ｃとは、密閉部材１２０を介して連結部材１２２によって連結されている。
　第一のカバー部１１２の第二の連結部１１２ｄと第二のカバー部１１４の第二の連結部１１４ｄとは、この第二の連結部１１４ｄが上側になるようにして密閉部材１２０を介して連結部材１２２によって連結されている。 The second connecting portion 104 e of the base plate 104 and the first connecting portion 114 c of the second cover portion 112 are connected by a connecting member 122 through a sealing member 120.
The second connecting portion 112d of the first cover portion 112 and the second connecting portion 114d of the second cover portion 114 are arranged via the sealing member 120 so that the second connecting portion 114d is on the upper side. They are connected by a connecting member 122.
　ベースプレート１０４、第一のカバー部１１２及び第二のカバー部１１４は、例えば、表面をメッキ処理あるいは塗装した鉄や鉄合金、アルミニウム、アルミニウム合金等の金属板により形成される。第二のカバー部１１４は特に、成形性や放熱性の観点から、アルミダイカストにより形成するようにしてもよい。
　ベースプレート１０４の厚みは、第一のカバー部１１２と同程度としてもよいし、第一のカバー部１１２よりも厚くするようにしてもよい。 The base plate 104, the first cover part 112, and the second cover part 114 are formed of, for example, a metal plate such as iron, iron alloy, aluminum, or aluminum alloy whose surface is plated or painted. In particular, the second cover portion 114 may be formed by aluminum die casting from the viewpoint of formability and heat dissipation.
The thickness of the base plate 104 may be the same as that of the first cover portion 112 or may be thicker than the first cover portion 112.
　図３Ｂに示すように、サイドプレート１０８は板状の部材であり、その下部には前後方向に延びる溝部１０８ａが形成されている。溝部１０８ａには密閉部材１２０が設けられており、この密閉部材１２０を介して溝部１０８ａにベースプレート１０４の左右の端部が嵌るようになっている。
　サイドプレート１０８の上部には、密閉部材１２０を介してカバープレート１０６の左右の端部が配置されるようになっている。
　サイドプレート１０８は、ベースプレート１０４の固定部材１１０及びカバープレート１０６の固定部材１１６と、連結部材１２２によって固定されている。 As shown in FIG. 3B, the side plate 108 is a plate-like member, and a groove 108a extending in the front-rear direction is formed in the lower part thereof. The groove portion 108 a is provided with a sealing member 120, and the left and right end portions of the base plate 104 are fitted into the groove portion 108 a through the sealing member 120.
The left and right end portions of the cover plate 106 are arranged on the upper portion of the side plate 108 via the sealing member 120.
The side plate 108 is fixed by a fixing member 110 of the base plate 104, a fixing member 116 of the cover plate 106, and a connecting member 122.
　外装ケース１０２は、内部が密閉された構造となっている。外装ケース１０２内には、ベースプレート１０４、サイドプレート１０８及び第一のカバー部１１２で囲まれ電池ブロック４を収納する第一の収納部１２４と、ベースプレート１０４、サイドプレート１０８及び第二のカバー部１１４で囲まれ電池制御装置６を収納する第二の収納部１２６とが形成される。 The exterior case 102 has a sealed structure. In the exterior case 102, a first storage portion 124 that is surrounded by the base plate 104, the side plate 108, and the first cover portion 112 and stores the battery block 4, and the base plate 104, the side plate 108, and the second cover portion 114 are stored. And a second storage portion 126 for storing the battery control device 6 is formed.
　第一の収納部１２４内において、電池ブロック４は、ベースプレート１０４、第一のカバー部１１２及びサイドプレート１０８に対して固定されている。第一の収納部１２４には、電池ブロック４を冷却する冷却ダクト１２８が複数の電池ブロック４の間を通過するようにして設けられている。 In the first storage part 124, the battery block 4 is fixed to the base plate 104, the first cover part 112, and the side plate 108. A cooling duct 128 that cools the battery block 4 is provided in the first storage portion 124 so as to pass between the plurality of battery blocks 4.
　次に、電池ブロック４及び電池制御装置６の詳細について、図４を用いて説明する。
（電池ブロック）
　本実施形態においては、電池ブロック４は四つ設けられており、直列に二つ並べられたものが二列に配置されている。電池ブロック４は、複数の角形電池セル１２と、複数のスペーサ１４と、二つのエンドスペーサ１６と、二つのエンドプレート１８と、バインドバー２０とを備える。 Next, details of the battery block 4 and the battery control device 6 will be described with reference to FIG.
(Battery block)
In the present embodiment, four battery blocks 4 are provided, and two battery blocks arranged in series are arranged in two rows. The battery block 4 includes a plurality of rectangular battery cells 12, a plurality of spacers 14, two end spacers 16, two end plates 18, and a bind bar 20.
　複数の角形電池セル１２は並置（図４中、左右方向に並ぶようにして配置）され、スペーサ１４は隣り合う二つの角形電池セル１２に挟まれるようにして配置されている。エンドスペーサ１６は、並置方向の端に配置された角形電池セル１２の外側に配置されている。エンドプレート１８は、エンドスペーサ１６の並置方向外側に配置され、角形電池セル１２、スペーサ１４及びエンドスペーサ１６を挟むようになっている。バインドバー２０はエンドプレート１８に接続され、角形電池セル１２、スペーサ１４及びエンドスペーサ１６を並置方向に加圧するようにして、これらを固定している。
　隣り合う角形電池セル１２は、バスバー２２を介して電気的に接続されている。 The plurality of prismatic battery cells 12 are juxtaposed (arranged in the left-right direction in FIG. 4), and the spacer 14 is disposed so as to be sandwiched between two adjacent prismatic battery cells 12. The end spacer 16 is disposed outside the rectangular battery cell 12 disposed at the end in the juxtaposition direction. The end plate 18 is disposed outside the end spacer 16 in the juxtaposition direction, and sandwiches the prismatic battery cell 12, the spacer 14, and the end spacer 16. The bind bar 20 is connected to the end plate 18 to fix the prismatic battery cell 12, the spacer 14, and the end spacer 16 so as to pressurize them in the juxtaposition direction.
Adjacent rectangular battery cells 12 are electrically connected via a bus bar 22.
　スペーサ１４は、複数の角形電池セル１２同士を絶縁し、角形電池セル１２がショートするのを防止する。スペーサ１４は、外形（並置方向に並ぶ面）が角形電池セル１２と同程度の大きさとなっている。
　スペーサ１４は絶縁性を有するとともに、角形電池セル１２等により挟まれても損傷しない程度の強度に設計されている。スペーサ１４は、例えばナイロン樹脂やエポキシ樹脂、ポリエチレンテレフタレート等のプラスチックなどにより形成される。 The spacer 14 insulates the plurality of prismatic battery cells 12 and prevents the prismatic battery cells 12 from short-circuiting. The spacer 14 has an outer shape (surface aligned in the juxtaposition direction) of the same size as the prismatic battery cell 12.
The spacer 14 has an insulating property and is designed to have a strength that does not damage even if it is sandwiched between the rectangular battery cells 12 and the like. The spacer 14 is formed of, for example, nylon resin, epoxy resin, plastic such as polyethylene terephthalate, or the like.
　エンドスペーサ１６は、スペーサ１４と同様に構成されている。エンドスペーサ１６の左右方向の長さ（厚さ）は、スペーサ１４と同程度であってもよいし、適宜変更するようにしてもよい。 The end spacer 16 is configured in the same manner as the spacer 14. The length (thickness) in the left-right direction of the end spacer 16 may be the same as that of the spacer 14 or may be changed as appropriate.
　エンドプレート１８は、外形（並置方向に並ぶ面）が角形電池セル１２と同程度の大きさの直方体形状であり、アルミニウムやアルミニウム合金等の比較的高い強度を有する金属や硬質のプラスチックなどで形成されている。エンドプレート１８は、外形を角形電池セル１２よりも大きくするようにしてもよい。 The end plate 18 has a rectangular parallelepiped shape whose outer shape (surface aligned in the juxtaposition direction) is about the same size as the prismatic battery cell 12, and is formed of a relatively high strength metal such as aluminum or aluminum alloy, or hard plastic. Has been. The end plate 18 may have an outer shape larger than that of the square battery cell 12.
　バインドバー２０は、比較的強度の高い金属板、例えばステンレス板や鋼板等で形成されている。バインドバー２０は、左右方向の端部を折り曲げた形状としてもよい。これにより、本構成を有さない場合と比較して、締結強度が向上する。 The bind bar 20 is formed of a relatively strong metal plate such as a stainless steel plate or a steel plate. The bind bar 20 may have a shape in which an end portion in the left-right direction is bent. Thereby, compared with the case where this structure is not provided, fastening strength improves.
（電池制御装置）
　電池制御装置６は、電池ブロック４の角形電池セル１２に電気的に接続されており、角形電池セル１２の動作を制御する。具体的には、電池制御装置６は、角形電池セル１２の電圧や電流、残容量、温度等の状態を検出し、これに基づいて角形電池セル１２の充放電を制御する。 (Battery control device)
The battery control device 6 is electrically connected to the rectangular battery cell 12 of the battery block 4 and controls the operation of the rectangular battery cell 12. Specifically, the battery control device 6 detects the state of the voltage, current, remaining capacity, temperature, etc. of the rectangular battery cell 12, and controls charging / discharging of the rectangular battery cell 12 based on this.
　例えば、電池制御装置６が角形電池セル１２の電圧を検出して充放電制御を行う場合、充電時に角形電池セル１２の電圧が予め定めた最高充電電圧よりも高くなると充電電流を制限し、放電時に角形電池セル１２の電圧が予め定めた最低放電電圧よりも低くなると放電電流を制限する。このようにして、角形電池セル１２の過充電及び過放電を防止する。 For example, when the battery control device 6 performs charge / discharge control by detecting the voltage of the prismatic battery cell 12, the charging current is limited and discharged when the voltage of the prismatic battery cell 12 becomes higher than a predetermined maximum charging voltage during charging. Sometimes the discharge current is limited when the voltage of the rectangular battery cell 12 becomes lower than a predetermined minimum discharge voltage. In this way, overcharge and overdischarge of the rectangular battery cell 12 are prevented.
　また、電池制御装置６が角形電池セル１２の充放電電流を検出して充放電制御を行う場合、角形電池セル１２に予め定められた値以上の電流が流れた場合に電流を遮断する。
　電池制御装置６が角形電池セル１２の残容量を検出して充放電制御を行う場合、充電時に角形電池セル１２の残容量が予め定められた最大値よりも大きくなると充電電流を制限し、放電時に角形電池セル１２の残容量が予め定められた最小値よりも小さくなると放電電流を制限する。
　電池制御装置６は、角形電池セル１２の温度を検出して充放電制御を行うことも可能である。 In addition, when the battery control device 6 performs charge / discharge control by detecting the charge / discharge current of the prismatic battery cell 12, the current is cut off when a current of a predetermined value or more flows through the prismatic battery cell 12.
When the battery control device 6 detects the remaining capacity of the prismatic battery cell 12 and performs charge / discharge control, if the remaining capacity of the prismatic battery cell 12 exceeds a predetermined maximum value during charging, the charging current is limited and discharged. Sometimes the discharge current is limited when the remaining capacity of the rectangular battery cell 12 becomes smaller than a predetermined minimum value.
The battery control device 6 can also perform charge / discharge control by detecting the temperature of the rectangular battery cell 12.
（電池セルの全体構造）
　次に、実施形態で用いた角形電池セル１２の詳細について、図５及び図６を用いて説明する。
　角形電池セル１２は、例えば角形非水電解質二次電池であり、直方体形状の外装体３０と、封口体３２とを備える。外装体３０は、左右方向に対向する二つの幅の広い面（以下、「幅広面３０ａ」という）と、上下方向に対向する二つの幅の狭い面（以下、「幅狭面３０ｂ」という）と、後方に位置する側面３０ｃとで囲まれ、前方が開口した形状となっている。封口体３２は、外装体３０の開口を封じるように配置されている。外装体３０と封口体３２とはレーザ溶接されており、角形電池セル１２の内部は密閉されている。 (Battery cell overall structure)
Next, details of the rectangular battery cell 12 used in the embodiment will be described with reference to FIGS. 5 and 6.
The prismatic battery cell 12 is, for example, a prismatic nonaqueous electrolyte secondary battery, and includes a rectangular parallelepiped exterior body 30 and a sealing body 32. The exterior body 30 has two wide surfaces facing in the left-right direction (hereinafter referred to as “wide surface 30a”) and two narrow surfaces facing in the vertical direction (hereinafter referred to as “narrow surface 30b”). And a side surface 30c located at the rear, and the front is open. The sealing body 32 is arrange | positioned so that the opening of the exterior body 30 may be sealed. The exterior body 30 and the sealing body 32 are laser welded, and the inside of the rectangular battery cell 12 is sealed.
　封口体３２には、正極端子３４が絶縁部材３６を介して固定され、負極端子３８が絶縁部材４０を介して固定されている。これらの正極端子３４及び負極端子３８には、バスバー２２（図４参照）が接続される。
　外装体３０、封口体３２、正極端子３４はそれぞれアルミニウム又はアルミニウム合金により形成されており、負極端子３８は銅又は銅合金により形成されている。 A positive electrode terminal 34 is fixed to the sealing body 32 via an insulating member 36, and a negative electrode terminal 38 is fixed via an insulating member 40. The bus bar 22 (see FIG. 4) is connected to the positive terminal 34 and the negative terminal 38.
The exterior body 30, the sealing body 32, and the positive electrode terminal 34 are each formed of aluminum or an aluminum alloy, and the negative electrode terminal 38 is formed of copper or a copper alloy.
　封口体３２には、電解液を注入する注液口４２と、ガス排出弁４４とが設けられている。ガス排出弁４４は、角形電池セル１２内が予め定められた圧力以上となった場合にこの角形電池セル１２内のガスを外部へ排出するようになっている。 The sealing body 32 is provided with a liquid injection port 42 for injecting an electrolytic solution and a gas discharge valve 44. The gas discharge valve 44 discharges the gas in the prismatic battery cell 12 to the outside when the pressure in the prismatic battery cell 12 exceeds a predetermined pressure.
　外装体３０の内側には、樹脂で形成されたシート状の絶縁シート４６が配設されており、この絶縁シート４６の内側には、偏平状巻回電極体５０が配置されている。偏平状巻回電極体５０は、正極板５２と、負極板５４と、セパレータ５６とを備え、これら正極板５２と負極板５４とがセパレータ５６を介して互いに絶縁された状態で偏平状に巻回された構成を有している。
　偏平状巻回電極体５０は、最外周がセパレータ５６となりその内側が負極板５４、さらにその内側が正極板５２の順となるように巻かれている。セパレータ５６としては、例えばポリオレフィンから形成される微多孔膜が用いられる。 A sheet-like insulating sheet 46 made of resin is disposed inside the exterior body 30, and a flat wound electrode body 50 is disposed inside the insulating sheet 46. The flat wound electrode body 50 includes a positive electrode plate 52, a negative electrode plate 54, and a separator 56. The positive electrode plate 52 and the negative electrode plate 54 are wound in a flat shape in a state where they are insulated from each other via the separator 56. It has a rotated configuration.
The flat wound electrode body 50 is wound so that the outermost periphery is the separator 56 and the inner side is the negative electrode plate 54 and the inner side is the positive electrode plate 52 in that order. As the separator 56, for example, a microporous film made of polyolefin is used.
　ガスはその性質上、水平方向よりも鉛直方向に移動し易い。偏平状巻回電極体５０内でガスが発生した場合、この偏平状巻回電極体５０の巻回軸が水平方向となるように配置されていると、偏平状巻回電極体５０の内部にガスがたまり易い。これに対して、偏平状巻回電極体５０の巻回軸が水平方向に対して傾くように配置されていると、巻回軸が水平方向となるように配置されている場合と比較して、この偏平状巻回電極体５０の外部へガスが抜け易くなる。 Gas is easier to move in the vertical direction than in the horizontal direction due to its nature. When gas is generated in the flat spirally wound electrode body 50, if the winding axis of the flat spirally wound electrode body 50 is arranged in the horizontal direction, the flat spirally wound electrode body 50 has an inside. Gas tends to accumulate. On the other hand, when the winding axis of the flat wound electrode body 50 is arranged so as to be inclined with respect to the horizontal direction, compared to the case where the winding axis is arranged so as to be in the horizontal direction. The gas can easily escape to the outside of the flat wound electrode body 50.
　本実施形態においては、偏平状巻回電極体５０の巻回軸は、水平方向から略鉛直方向となるように配置され、正極端子３４及び負極端子３８が設けられた封口体３２の面と略平行となっている。正極端子３４と負極端子３８とは、偏平状巻回電極体５０の巻回軸と平行な一面に、この巻回軸方向に離間するようにして配置されている。電源装置２においては、角形電池セル１２は封口体３４が前側となるように配置されている。これにより、偏平状巻回電極体５０内で発生したガスは外部（図５Ｂ及び図６Ａにおける上方）へ向けて移動し易くなる。
　偏平状巻回電極体５０の巻回軸の水平面に対する角度は、鉛直方向に対して±２０°程度であり、好ましくは±１０°であり、より好ましくは±５°である。 In the present embodiment, the winding axis of the flat wound electrode body 50 is disposed so as to be substantially vertical from the horizontal direction, and is substantially the same as the surface of the sealing body 32 provided with the positive electrode terminal 34 and the negative electrode terminal 38. It is parallel. The positive electrode terminal 34 and the negative electrode terminal 38 are arranged on one surface parallel to the winding axis of the flat wound electrode body 50 so as to be separated in the winding axis direction. In the power supply device 2, the rectangular battery cells 12 are arranged so that the sealing body 34 is on the front side. Thereby, the gas generated in the flat spirally wound electrode body 50 is likely to move outward (upward in FIGS. 5B and 6A).
The angle of the winding axis of the flat wound electrode body 50 with respect to the horizontal plane is about ± 20 ° with respect to the vertical direction, preferably ± 10 °, and more preferably ± 5 °.
　正極板５２には、正極芯体の両面に塗布された正極合剤層と、正極芯体露出部５８とが形成されている。正極芯体露出部５８は、正極合剤が塗布されていない部分であり、正極芯体が偏平状巻回電極体５０の巻回方向に帯状に露出している部分である。
　正極芯体は、例えばアルミニウムやアルミニウム合金等から形成され、厚さが１０～２０μｍ程度のものが用いられる。 The positive electrode plate 52 is formed with a positive electrode mixture layer applied to both surfaces of the positive electrode core and a positive electrode core exposed portion 58. The positive electrode core exposed portion 58 is a portion where the positive electrode mixture is not applied, and is a portion where the positive electrode core is exposed in a strip shape in the winding direction of the flat wound electrode body 50.
The positive electrode core is made of, for example, aluminum or an aluminum alloy and has a thickness of about 10 to 20 μm.
　負極板５４には、負極芯体の両面に塗布された負極合剤層と、負極芯体露出部６０とが形成されている。負極芯体露出部６０は、負極合剤が塗布されていない部分であり、負極芯体が偏平状巻回電極体５０の巻回方向に帯状に露出している部分である。
　負極合剤層の形成範囲（幅及び長さ）は、正極合剤層の範囲よりも大きくなっている。
　負極芯体は、例えば銅や銅合金等から形成され、厚さが５～１５μｍ程度のものが用いられる。 The negative electrode plate 54 is formed with a negative electrode mixture layer applied to both surfaces of the negative electrode core and a negative electrode core exposed portion 60. The negative electrode core exposed portion 60 is a portion where the negative electrode mixture is not applied, and is a portion where the negative electrode core is exposed in a strip shape in the winding direction of the flat wound electrode body 50.
The formation range (width and length) of the negative electrode mixture layer is larger than the range of the positive electrode mixture layer.
The negative electrode core is made of, for example, copper or copper alloy, and has a thickness of about 5 to 15 μm.
　偏平状巻回電極体５０は、一端側（図６Ａにおいて上側）に正極芯体露出部５８が複数重なるようにして配置され、他端側（同、下側）に負極芯体露出部６０が複数重なるように配置された構成となっている。正極板５２と負極板５４とは、正極芯体露出部５８が負極活物質合剤の塗布された層と重ならないように配置されるとともに、負極芯体露出部６０が正極合剤の塗布された層と重ならないように配置されている。 The flat wound electrode body 50 is arranged so that a plurality of the positive electrode core exposed portions 58 overlap on one end side (upper side in FIG. 6A), and the negative electrode core exposed portion 60 on the other end side (same as the lower side). It is the structure arrange | positioned so that two or more may overlap. The positive electrode plate 52 and the negative electrode plate 54 are arranged so that the positive electrode core exposed portion 58 does not overlap the layer coated with the negative electrode active material mixture, and the negative electrode core exposed portion 60 is coated with the positive electrode mixture. It is arranged so that it does not overlap with other layers.
　正極芯体露出部５８の外側には、アルミニウム又はアルミニウム合金から形成される正極集電体６２が設けられている。
　巻回されて積層された複数枚の正極芯体露出部５８は、厚み方向の中央部に収束されてさらに二分割され、偏平状巻回電極体５０の厚みの１／４を中心として正極芯体露出部５８が収束され、その間に正極中間部材６４が配置されている。 A positive electrode current collector 62 made of aluminum or an aluminum alloy is provided outside the positive electrode core exposed portion 58.
The plurality of positive electrode core exposed portions 58 wound and laminated are converged at the center in the thickness direction and further divided into two, and the positive electrode core is centered on 1/4 of the thickness of the flat wound electrode body 50. The body exposed portion 58 is converged, and the positive electrode intermediate member 64 is disposed therebetween.
　正極中間部材６４は、樹脂材料からなる基体に導電性の正極導電部材６６を複数個、ここでは二個保持している。正極導電部材６６は、円柱状のものが用いられ、それぞれ積層された正極芯体露出部５８と対向する側に、プロジェクションとして作用する円錐台状の突起６８が形成されている。 The positive electrode intermediate member 64 holds a plurality of conductive positive electrode conductive members 66, here two, on a base made of a resin material. The positive electrode conductive member 66 has a columnar shape, and a truncated cone-shaped protrusion 68 that acts as a projection is formed on the side facing each of the stacked positive electrode core exposed portions 58.
　正極芯体露出部５８は、正極集電体６２を介して正極端子３４に電気的に接続されている。正極集電体６２と正極端子３４との間には、電流遮断機構７０が設けられている。電流遮断機構７０は、角形電池セル１２内が予め定められた圧力以上となった場合に、電流を遮断するように動作する。電流遮断機構７０は、ガス排出弁４４が作動する圧力よりも低い圧力で作動するようになっている。
　電流遮断機構７０及びガス排出弁４４は、内圧の上昇によって作動して電源装置１０等の安全性を確保する保護機構として機能する。 The positive electrode core exposed portion 58 is electrically connected to the positive electrode terminal 34 via the positive electrode current collector 62. A current interruption mechanism 70 is provided between the positive electrode current collector 62 and the positive electrode terminal 34. The current interruption mechanism 70 operates so as to cut off the current when the inside of the rectangular battery cell 12 becomes equal to or higher than a predetermined pressure. The electric current interruption mechanism 70 operates at a pressure lower than the pressure at which the gas discharge valve 44 operates.
The current interrupt mechanism 70 and the gas discharge valve 44 function as a protection mechanism that operates by increasing the internal pressure and ensures the safety of the power supply device 10 and the like.
　負極芯体露出部６０の外側には、銅又は銅合金から形成される負極集電体７２が設けられている。巻回されて積層された複数枚の負極芯体露出部６０は、厚み方向の中央側に収束されてさらに分割され、偏平状巻回電極体５０の厚みの１／４を中心として負極芯体露出部６０が収束され、その間に負極中間部材７４が配置されている。 A negative electrode current collector 72 formed of copper or a copper alloy is provided outside the negative electrode core exposed portion 60. The plurality of negative electrode core exposed portions 60 wound and laminated are converged and further divided on the center side in the thickness direction, and the negative electrode core body is centered on 1/4 of the thickness of the flat wound electrode body 50. The exposed portion 60 is converged, and the negative electrode intermediate member 74 is disposed therebetween.
　負極中間部材７４は、樹脂材料からなる基体に負極導電部材７６を複数個、ここでは二個保持している。負極導電部材７６は、円柱状のものが用いられ、それぞれ積層された負極芯体露出部と対向する側に、プロジェクションとして作用する円錐台状の突起７８が形成されている。
　負極芯体露出部６０は、負極集電体７２を介して負極端子３８に電気的に接続されている。 The negative electrode intermediate member 74 holds a plurality of, here two, negative electrode conductive members 76 on a base made of a resin material. The negative electrode conductive member 76 has a columnar shape, and a truncated cone-shaped projection 78 that acts as a projection is formed on the side facing each of the laminated negative electrode core exposed portions.
The negative electrode core exposed portion 60 is electrically connected to the negative electrode terminal 38 via the negative electrode current collector 72.
　これらの正極集電体６２と、正極芯体露出部５８と、正極中間部材６４の正極導電部材６６との間の抵抗溶接方法、及び、負極集電体７２と、負極芯体露出部６０と、負極中間部材７４の負極導電部材７６との間の抵抗溶接方法としては、周知の技術が用いられる。 Resistance welding method between the positive electrode current collector 62, the positive electrode core exposed portion 58, and the positive electrode conductive member 66 of the positive electrode intermediate member 64, and the negative electrode current collector 72, the negative electrode core exposed portion 60, As a resistance welding method between the negative electrode intermediate member 74 and the negative electrode conductive member 76, a well-known technique is used.
　次に、角形電池セル１２の製造方法について詳細について説明する。 Next, the manufacturing method of the rectangular battery cell 12 will be described in detail.
（正極板の構成）
　正極板５２としては、例えば以下のようにして作製されるものが用いられる。
　正極活物質として、ＬｉＮｉ０．３５Ｃｏ０．３５Ｍｎ０．３０Ｏ２で表されるリチウムニッケルコバルトマンガン複合酸化物を用いる。リチウムニッケルコバルトマンガン複合酸化物と、導電剤としての炭素粉末と、結着剤としてのポリフッ化ビニリデン(ＰＶｄ
Ｆ)と、炭酸リチウムとを含む正極合剤に、分散媒としてのＮ－メチル－２－ピロリドン
（ＮＭＰ)を混合して正極スラリーを調製する。 (Configuration of positive electrode plate)
As the positive electrode plate 52, for example, one produced as follows is used.
As the positive electrode active material, a lithium nickel cobalt manganese composite oxide represented by LiNi 0.35 Co 0.35 Mn 0.30 O 2 is used. Lithium nickel cobalt manganese composite oxide, carbon powder as a conductive agent, and polyvinylidene fluoride (PVd) as a binder
The positive electrode mixture containing F) and lithium carbonate is mixed with N-methyl-2-pyrrolidone (NMP) as a dispersion medium to prepare a positive electrode slurry.
　リチウムニッケルコバルトマンガン複合酸化物と、炭素粉末と、ＰＶｄＦとは、それぞれ質量比で８８：９：３となるように含有させる。炭酸リチウムは、正極合剤に対して、０．１～５．０質量％含有させることが好ましい。正極合剤における炭酸リチウムの含有量が０．１質量％未満であると、炭酸リチウムからの炭酸ガスの発生が少なく、保護機構を迅速に作動させ難くなる。正極合剤における炭酸リチウムの含有量が５．０質量％を超えると、電極反応に関与しない炭酸リチウムの割合が過度に多くなり、電池容量の低下が大きくなる。 The lithium nickel cobalt manganese composite oxide, carbon powder, and PVdF are contained so as to have a mass ratio of 88: 9: 3, respectively. Lithium carbonate is preferably contained in an amount of 0.1 to 5.0% by mass with respect to the positive electrode mixture. When the content of lithium carbonate in the positive electrode mixture is less than 0.1% by mass, the generation of carbon dioxide from the lithium carbonate is small and it is difficult to quickly activate the protection mechanism. When the content of lithium carbonate in the positive electrode mixture exceeds 5.0% by mass, the proportion of lithium carbonate not involved in the electrode reaction is excessively increased, and the battery capacity is greatly reduced.
　この正極スラリーを、正極芯体の両面にダイコーターによって塗布して、正極合剤層を正極芯体の両面に形成する。次いで、乾燥させてＮＭＰを除去し、ロールプレスによって所定の厚さとなるように圧縮する。所定の寸法に切り出した後、幅方向の一端側に長さ方向（巻き方向）全体にわたる正極芯体露出部５８を形成するように正極合剤層の一部を除去する。 The positive electrode slurry is applied to both surfaces of the positive electrode core with a die coater to form a positive electrode mixture layer on both surfaces of the positive electrode core. Next, it is dried to remove NMP, and compressed to a predetermined thickness by a roll press. After cutting out to a predetermined dimension, a part of the positive electrode mixture layer is removed so as to form the positive electrode core body exposed portion 58 over the entire length direction (winding direction) on one end side in the width direction.
（負極板の構成）
　負極板５４としては、例えば以下のようにして作製されるものが用いられる。
　黒鉛粉末と、増粘剤としてのカルボキシメチルセルロース（ＣＭＣ）と、結着剤としてのスチレン－ブタジエンゴム（ＳＢＲ）とを含む負極合剤を、水に分散させて負極スラリーを調整する。黒鉛粉末と、ＣＭＣと、ＳＢＲとは、それぞれ質量比で９８：１：１となるように含有させる。 (Configuration of negative electrode plate)
As the negative electrode plate 54, for example, one produced as follows is used.
A negative electrode slurry containing graphite powder, carboxymethyl cellulose (CMC) as a thickener, and styrene-butadiene rubber (SBR) as a binder is dispersed in water to prepare a negative electrode slurry. The graphite powder, CMC, and SBR are contained so as to have a mass ratio of 98: 1: 1, respectively.
　この負極スラリーを負極芯体の両面にダイコーターによって塗布して、負極合剤層を負極芯体の両面に形成する。次いで、圧縮ローラーを用いて所定の厚さとなるように圧縮する。定の寸法に切り出した後、幅方向の一端側に長さ方向（巻き方向）全体にわたる負極芯体露出部６０を形成するように負極合剤層の一部を除去する。 The negative electrode slurry is applied to both surfaces of the negative electrode core by a die coater, and a negative electrode mixture layer is formed on both surfaces of the negative electrode core. Subsequently, it compresses so that it may become predetermined thickness using a compression roller. After cutting out to a fixed dimension, a part of negative electrode mixture layer is removed so that the negative electrode core exposed part 60 covering the whole length direction (winding direction) may be formed in the one end side of the width direction.
（非水電解液の調製）
　非水電解液としては、例えば以下のように調製されるものが用いられる。
　エチレンカーボネート（ＥＣ）とメチルエチルカーボネート（ＭＥＣ）とを体積比（２５℃、１気圧）で３：７の割合で混合した混合溶媒に、電解質塩としてＬｉＰＦ６を１ｍｏｌ／Ｌとなるように添加する。 (Preparation of non-aqueous electrolyte)
As the nonaqueous electrolytic solution, for example, one prepared as follows is used.
LiPF 6 as an electrolyte salt is added to a mixed solvent in which ethylene carbonate (EC) and methyl ethyl carbonate (MEC) are mixed at a volume ratio (25 ° C., 1 atm) in a ratio of 3: 7 so as to be 1 mol / L. To do.
（角形電池セルの作製）
　角形電池セル１２は、例えば以下のようにして作製される。
　正極板５２及び負極板５４を、セパレータ５６を介して互いに絶縁されるようにして最外面が負極板５４となるように巻回した後、これを偏平状に成型して偏平状巻回電極体５０を作製する。偏平状巻回電極体５０を外装体３０に収容した後、この外装体３０の開口に封口体３２を嵌合し、これら外装体３０と封口体３２との間をレーザ溶接する。次いで、注液口４２から非水電解液を所定量注液する。そして、注液口４２をブラインドリベットにより封止する。 (Preparation of prismatic battery cell)
The square battery cell 12 is produced as follows, for example.
The positive electrode plate 52 and the negative electrode plate 54 are wound so that they are insulated from each other via the separator 56 so that the outermost surface becomes the negative electrode plate 54, and then are formed into a flat shape to form a flat wound electrode body. 50 is produced. After the flat wound electrode body 50 is accommodated in the exterior body 30, the sealing body 32 is fitted into the opening of the exterior body 30, and laser welding is performed between the exterior body 30 and the sealing body 32. Next, a predetermined amount of nonaqueous electrolytic solution is injected from the injection port 42. Then, the liquid injection port 42 is sealed with a blind rivet.
　このようにして作製された角形電池セル１２においては、過充電状態となって電池電圧が通常時よりも高くなると、正極合剤層中の炭酸リチウムが分解して炭酸ガスが発生する。実施形態の電源装置２においては、角形電池セル１２は偏平状巻回電極体５０の巻回軸が略垂直方向となるように配置されている。このため、偏平状巻回電極体５０内でのガスの流動性が良好となるので、偏平状巻回電極体５０で発生したガスが偏平状巻回電極体５０の内部にとどまることが抑制される、これにより、角形電池セル１２の内圧上昇が急となり、電流遮断機構７０を迅速に作動させることができる。 In the rectangular battery cell 12 produced in this way, when the battery voltage becomes higher than usual during an overcharged state, the lithium carbonate in the positive electrode mixture layer is decomposed and carbon dioxide gas is generated. In the power supply device 2 of the embodiment, the rectangular battery cells 12 are arranged such that the winding axis of the flat wound electrode body 50 is in a substantially vertical direction. For this reason, since the fluidity of the gas in the flat wound electrode body 50 is improved, the gas generated in the flat wound electrode body 50 is suppressed from staying inside the flat wound electrode body 50. As a result, the internal pressure of the rectangular battery cell 12 increases suddenly, and the current interrupt mechanism 70 can be operated quickly.
　なお、実施形態では電池セルとして角形電池セルの場合を例にとり説明した。しかし、本発明は、複数の巻回電極体の巻回軸が略鉛直方向となるように並置されているものであれば所定の作用効果を奏する。そのため、本発明は、巻回電極体を備える円筒形電池セルに対しても等しく適用することができる。 In the embodiment, the case where the battery cell is a square battery cell has been described as an example. However, the present invention has a predetermined effect as long as the winding axes of the plurality of wound electrode bodies are arranged in parallel so as to be in the substantially vertical direction. Therefore, the present invention can be equally applied to a cylindrical battery cell including a wound electrode body.
　電源装置１０は、電気自動車やハイブリッド式電気自動車、プラグイン式ハイブリッド電気自動車等に好適に利用できる。また、コンピュータサーバラックに搭載されるバックアップ電源装置や、携帯電話等の無線基地局用のバックアップ電源装置、家庭用又は工場用の蓄電用電源装置、太陽電池と組み合わせた蓄電装置などの用途にも利用できる。 The power supply device 10 can be suitably used for an electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, and the like. Moreover, and backup power supply devices mounted on the computer server rack, mobile phones Bas Tsu up power supply for a radio base station, the power storage power supply device for home or factory, such as the power storage device in combination with a solar cell applications It can also be used.
　　２…電源装置　　　　　　　４…電池ブロック　　　　　６…電池制御装置
　１２…角形電池セル　　　　１４…スペーサ　　　　　　２０…バインドバー
　２２…バスバー　　　　　　３０…外装体　　　　　　　３２…封口体
　３４…正極端子　　　　　　３８…負極端子　　　　　　４２…注液口
　４４…ガス排出弁　　　　　５０…偏平状巻回電極体　　５２…正極板
　５４…負極板　　　　　　　５６…セパレータ　　　　　５８…正極芯体露出部
　６０…負極芯体露出部　　　６２…正極集電体　　　　　７０…電流遮断機構
　７２…負極集電体　　　　　１０２…外装ケース　　　　１０４…ベースプレート
　１０６…カバープレート　　１０８…サイドプレート　　１１２…第一のカバー部
　１１４…第二のカバー部　　１２０…密閉部材　　　　　１２２…連結部材
　１２４…第一の収納部　　　１２６…第二の収納部　　　１２８…冷却ダクト
  DESCRIPTION OF SYMBOLS 2 ... Power supply device 4 ... Battery block 6 ... Battery control apparatus 12 ... Square battery cell 14 ... Spacer 20 ... Bind bar 22 ... Bus bar 30 ... Exterior body 32 ... Sealing body 34 ... Positive electrode terminal 38 ... Negative electrode terminal 42 ... Injection port 44 DESCRIPTION OF SYMBOLS ... Gas discharge valve 50 ... Flat coiled electrode body 52 ... Positive electrode plate 54 ... Negative electrode plate 56 ... Separator 58 ... Positive electrode core exposed part 60 ... Negative electrode core exposed part 62 ... Positive electrode collector 70 ... Current interruption | blocking mechanism 72 ... Negative electrode current collector 102 ... exterior case 104 ... base plate 106 ... cover plate 108 ... side plate 112 ... first cover part 114 ... second cover part 120 ... sealing member 122 ... connecting member 124 ... first storage part 126 ... Second storage section 128 ... cooling duct

Claims (5)

  1. 　正極合剤層を含む正極と、負極合剤層を含む負極と、前記正極及び前記負極をセパレータを介して互いに絶縁した状態で巻回した巻回電極体と、電池外装体と、内圧の上昇によって作動して安全性を確保する保護機構と、を備える複数個の電池セルを有し、
    　前記正極合剤層は、炭酸リチウムを含み、
    　前記複数個の電池セルは、それぞれが前記巻回電極体の巻回軸が略鉛直方向となるように並置されている、
    電源装置。     A positive electrode including a positive electrode mixture layer, a negative electrode including a negative electrode mixture layer, a wound electrode body wound in a state where the positive electrode and the negative electrode are insulated from each other via a separator, a battery exterior body, and an increase in internal pressure A plurality of battery cells comprising a protection mechanism that operates and ensures safety,
    The positive electrode mixture layer includes lithium carbonate,
    The plurality of battery cells are juxtaposed such that the winding axis of the wound electrode body is in a substantially vertical direction,
    Power supply.
  2. 　前記電池セルは非水電解質二次電池である、請求項１に記載の電源装置。 The power supply device according to claim 1, wherein the battery cell is a nonaqueous electrolyte secondary battery.
  3. 　前記複数個の電池セルは角形電池セルであり、前記巻回電極体は偏平状巻回電極体であり、前記正極に電気的に接続されている正極端子及び前記負極に電気的に接続されている負極端子は、ともに前記巻回軸と平行な一面に、前記巻回軸方向に離間して設けられている、請求項１又は２に記載の電源装置。 The plurality of battery cells are rectangular battery cells, the wound electrode body is a flat wound electrode body, and is electrically connected to the positive electrode terminal and the negative electrode electrically connected to the positive electrode. 3. The power supply device according to claim 1, wherein both negative electrode terminals are provided on one surface parallel to the winding axis and spaced apart in the winding axis direction.
  4. 　それぞれの前記角形電池セルの間にはスペーサが配置され、前記並置方向の両端にそれぞれ並置された前記角形電池セルの両方の外側にはそれぞれエンドスペーサが配置され、両方の前記エンドスペーサの外側にはそれぞれエンドプレートが配置され、前記電池セル、前記スペーサ及び前記エンドスペーサは、バインドバーによって並置方向に一体に加圧・固定されている、請求項３に記載の電源装置。 Spacers are arranged between the respective square battery cells, end spacers are respectively arranged on both outer sides of the square battery cells juxtaposed on both ends in the juxtaposition direction, and on both outer sides of the end spacers. 4. The power supply device according to claim 3, wherein end plates are respectively disposed, and the battery cell, the spacer, and the end spacer are integrally pressed and fixed in a juxtaposition direction by a bind bar.
  5. 　前記複数個の電池セルは、互いにバスバーによって直列、並列又は直並列に接続されている、請求項３又は４に記載の電源装置。
          The power supply device according to claim 3 or 4, wherein the plurality of battery cells are connected in series, parallel, or series-parallel to each other by a bus bar.
PCT/JP2014/003035 2013-07-01 2014-06-06 Power source device WO2015001711A1 (en)

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Cited By (1)

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JP2016152074A (en) * 2015-02-16 2016-08-22 株式会社豊田自動織機 Battery pack and fastening structure

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JPH04328278A (en) * 1991-04-26 1992-11-17 Sony Corp Nonaqueous electrolyte secondary battery
JPH07296790A (en) * 1994-04-28 1995-11-10 Japan Storage Battery Co Ltd Square type sealed battery
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JPH04328278A (en) * 1991-04-26 1992-11-17 Sony Corp Nonaqueous electrolyte secondary battery
JPH07296790A (en) * 1994-04-28 1995-11-10 Japan Storage Battery Co Ltd Square type sealed battery
JP2002245992A (en) * 2001-02-16 2002-08-30 Toyota Motor Corp Battery pack
JP2006351383A (en) * 2005-06-16 2006-12-28 Toyota Motor Corp Wound type power storage device
JP2008103268A (en) * 2006-10-20 2008-05-01 Toyota Motor Corp Battery pack and vehicle
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JP2016152074A (en) * 2015-02-16 2016-08-22 株式会社豊田自動織機 Battery pack and fastening structure

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