WO2016204088A1 - Battery - Google Patents

Battery Download PDF

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Publication number
WO2016204088A1
WO2016204088A1 PCT/JP2016/067363 JP2016067363W WO2016204088A1 WO 2016204088 A1 WO2016204088 A1 WO 2016204088A1 JP 2016067363 W JP2016067363 W JP 2016067363W WO 2016204088 A1 WO2016204088 A1 WO 2016204088A1
Authority
WO
WIPO (PCT)
Prior art keywords
sealant
electrode
portions
covering
tab
Prior art date
Application number
PCT/JP2016/067363
Other languages
French (fr)
Japanese (ja)
Inventor
雄治 坂野
Original Assignee
ブラザー工業株式会社
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 ブラザー工業株式会社 filed Critical ブラザー工業株式会社
Publication of WO2016204088A1 publication Critical patent/WO2016204088A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/102—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure
    • H01M50/105—Pouches or flexible bags
    • 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
    • H01M10/36—Accumulators not provided for in groups H01M10/05-H01M10/34
    • H01M10/38—Construction or manufacture
    • 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
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
    • 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
    • H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/178—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for pouch or flexible bag cells
    • 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 battery in which a plurality of electrode units each having an electrode and a conductor are accommodated in a covering.
  • Batteries are widely used in digital home appliances, electric vehicles, hybrid vehicles, solar power generation facilities, and the like.
  • Examples of the battery include a lithium ion secondary battery and a vanadium solid salt battery (Patent Document 1).
  • a vanadium redox secondary battery such as a vanadium solid salt battery performs charge / discharge using an oxidation-reduction reaction of an active material.
  • As the active material vanadium ions or ions containing vanadium are used.
  • the vanadium solid salt battery includes an electrode having an active material and an acidic electrolyte, and a metal conductor such as copper or stainless steel.
  • a power generating element in which a plurality of electrode units each having an electrode and a conductor are stacked is sealed by, for example, covering with an exterior bag made of a laminate sheet including a synthetic resin layer and a metal layer. Specifically, two laminated sheets are stacked as an outer bag, or one laminated sheet is folded in two, the power generation element is sandwiched in the thickness direction by the outer bag, and the positive electrode terminal and the negative electrode terminal protrude from the outer bag.
  • the power generation element is sealed by heating the peripheral edge of the bag and applying pressure in the thickness direction to fuse the synthetic resin layers together.
  • a cell formed by housing the power generation element in an exterior bag is housed in a case.
  • tabs are drawn out from a part of the peripheral edge of the conductor of each electrode unit, and the tabs from the positive electrode are bundled together in an outer bag, A positive electrode terminal is connected to the overlapped tab by welding. The positive terminal is extended to the outside of the outer bag. Tabs from the negative electrode are also overlapped in the exterior bag, and the negative terminal is connected to the overlapped tab.
  • the tab may be corroded when an acidic or alkaline electrolyte is present in the outer bag.
  • the tab is corroded, the battery performance is deteriorated, and the connection with the terminal may be defective.
  • the present invention has been made in view of such circumstances, and the tab drawn from the conductor of the electrode unit is prevented from corroding and is attached to the adhesive portion of the covering body in a state having good sealing performance.
  • An object is to provide a fixed battery.
  • the battery according to the present invention includes an electrode containing an acidic or alkaline electrolyte and a rectangular plate-shaped tab, each covering a plurality of stacked electrode units, the plurality of electrode units, and an outer peripheral edge portion.
  • a covering body having an adhesive portion bonded in layers, and a sealant covering the tab and adhered in a state sandwiched between the adhesive portions, the sealant having a width in the stacking direction of the electrode units. On the other hand, it is characterized by being gradually widened.
  • the battery according to the present invention has an electrode containing an acidic or alkaline electrolyte and an electrode unit having a rectangular plate-like tab, and a covering having an adhesive portion that covers the electrode unit and is bonded by overlapping the outer periphery. And a sealant that covers the tab and is bonded in a state of being sandwiched between the bonding portions, and the sealant includes two halves having different widths.
  • the tab of the electrode unit is covered with the sealant, and the sealant is bonded while being sandwiched between the bonding portions of the cover, so that the tab is prevented from corroding.
  • the width of the sealant of the stacked electrode units is configured to gradually increase with respect to the stacking direction of the electrode units, and the side portions of the stacked electrode units are stepped or inclined, Since the surface of the adhesive part facing the part is slanted, for example, when heating and pressurizing the adhesive part for bonding, the side part and the base part of the adhesive part are also subjected to heat and press pressure well. The adhesion between the adhesive part and the sealant is good. In this state, the tab is fixed to the adhesive portion.
  • the positive electrode or negative electrode terminal can be satisfactorily connected to the outside of the cover body containing the electrode unit, so that deterioration of battery performance is suppressed and connection reliability is improved.
  • the cover body can be downsized.
  • FIG. 3 is a plan view showing a cell 1 according to Embodiment 1.
  • FIG. FIG. 2 is a sectional view taken along line II-II in FIG.
  • FIG. 3 is a partial cross-sectional view taken along line III-III in FIG.
  • FIG. 4 is a partially enlarged view of FIG. 3.
  • 4 is a plan view showing an electrode unit 8.
  • FIG. 3 is a schematic cross-sectional view showing a connection portion between positive electrode tabs 62a and 92a and positive electrode terminal 3.
  • FIG. 6 is a schematic cross-sectional view showing a connection portion between negative electrode tab 82a and negative electrode terminal 4 of battery cell 11 according to Embodiment 3.
  • FIG. It is typical sectional drawing which shows the state which looked at the adhesion part 23 from the front.
  • FIG. It is typical sectional drawing which shows the state by which the half body 21, the half body 22, and each sealant were adhere
  • 6 is a schematic cross-sectional view showing a battery cell according to Embodiment 4.
  • FIG. It is typical sectional drawing which shows the state which looked at the adhesion part 23a from the front.
  • Embodiment 1 Embodiment 1 FIG.
  • a battery is configured by accommodating the cell 1 alone or a combination of the cell 1 and another cell in a case (not shown).
  • the cell 1 includes an outer bag 2, a positive terminal 3 and a negative terminal 4 protruding from a part of the peripheral edge of the outer bag 2, two positive electrode units 6, three negative electrode units 8, two A positive electrode unit 9 and six ion exchange membranes 7 are provided.
  • the electrode unit 8, the electrode unit 9, the electrode unit 8, the electrode unit 9, the electrode unit 8, and the electrode unit 6 are sequentially stacked on the lower electrode unit 6 in FIGS.
  • the electrode unit 8 is provided on the inner side of the peripheral portion of the surface of each protective layer 83, and is provided with a rectangular plate-shaped conductor 82, protective layers 83 and 83 covering both surfaces of the conductor 82, respectively. And a sealant 84 having a frame shape so as to sandwich each of the protective layers 83 and the conductor 82 and bonded to the peripheral edge of each protective layer 83.
  • the conductor 82 is preferably made of a metal foil such as copper, aluminum, nickel, or titanium.
  • the thickness is preferably 5 to 100 ⁇ m. When the thickness is 100 ⁇ m or less, the battery is lightweight and downsized.
  • the protective layers 83 and 83 are formed by coating both surfaces of the conductor 82 with graphite, and are conductive and have no electrolyte solution permeability.
  • the thickness of the protective layer 83 is preferably 1 to 100 ⁇ m. In this case, the electrical conductivity between the electrodes 80 and 81 and the conductor 82 is not lowered, and the internal resistance of the battery can be reduced.
  • the conductor 82 is not limited to the case where it is covered with a protective layer 83 formed by coating with graphite.
  • the covering material of the conductor 82 should just be electroconductivity and electrolyte solution non-permeable, and can be covered with an electroconductive film, a sheet-like electroconductive rubber, a graphite sheet, etc.
  • the graphite sheet may be arranged on one surface of the conductor 82 through a conductive adhesive sheet.
  • the electrode 81 is provided inside the peripheral edge of the upper surface of the upper protective layer 83 in FIG. 2, that is, at a portion other than the peripheral edge of the upper surface of the protective layer 83.
  • the electrode 80 is provided inside the peripheral edge of the lower surface of the lower protective layer 83, that is, at a portion other than the peripheral edge of the lower surface of the protective layer 83.
  • the electrodes 80 and 81 are formed by supporting a deposit containing a solid compound containing vanadium ions or ions containing vanadium as an active material on the protective layer 83.
  • the semi-solid material include a slurry material obtained by adding an aqueous sulfuric acid solution to a vanadium compound, and a gel material obtained by adding silica or the like to a vanadium compound.
  • a slurry that is a semi-solid material containing an active material, a binder, and a carbon material is applied to the protective layer 83 and dried to form the electrodes 80 and 81.
  • a precipitate containing a solid compound containing an active material by applying or impregnating a solution containing a vanadium compound, a semi-solid product, or a solid product to a carbon material such as carbon felt or drying. May be obtained, and the carbon material may be provided in the protective layer 83 as the electrodes 80 and 81.
  • the vanadium ions or vanadium-containing ions contained in the electrodes 80 and 81 are preferably vanadium ions whose oxidation number changes between divalent and trivalent by an oxidation-reduction reaction.
  • Examples of vanadium ions whose oxidation number varies between divalent and trivalent include V 2+ (II) and V 3+ (III).
  • Examples of the vanadium compound supported on the carbon material, which is an active material for a negative electrode include vanadium sulfate (II) (VSO 4 ⁇ nH 2 O), vanadium sulfate (III) (V 2 (SO 4 ) 3 ⁇ nH 2 O). Is mentioned. Mixtures of these can be used.
  • n represents 0 or an integer of 1 to 10.
  • the electrolyte contained in the electrodes 80 and 81 is preferably a sulfuric acid aqueous solution.
  • the sulfuric acid aqueous solution for example, sulfuric acid having a sulfuric acid concentration of less than 90% by mass can be used.
  • the amount of the electrolyte is not excessive or deficient so that the SOC of the battery can be taken from 0 to 100%.
  • the amount of the electrolytic solution is, for example, 70 mL of 2M (mol / L) sulfuric acid with respect to 100 g of the vanadium compound.
  • the sealant 84 has a frame shape as described above, and is formed by adhering the upper half 84a and the lower half 84b.
  • the half body 84a includes an inner edge portion 84c projecting inward at the upper end portion of the rectangular tube-shaped frame main body, and an outer edge portion 84d projecting outward at the lower end portion of the frame main body.
  • the half body 84b includes an inner edge portion 84e projecting inwardly at the lower end portion of the rectangular tube-shaped frame body, and an outer edge portion 84f projecting outward at the upper end portion of the frame body.
  • the inner edge portions 84c and 84e of the sealant 84 are bonded to the peripheral edge portions of the surfaces of the protective layers 83 and 83, and the outer edge portions 84d and 84f are bonded together.
  • the conductor 82 is sealed with protective layers 83 and 83 and a sealant 84. Note that the side surface of the conductor 82 may or may not be bonded to the sealant 84.
  • Sealant 84 is impermeable to electrolyte solution, and examples of the material include polypropylene or polyethylene. By using polypropylene or polyethylene, the conductor 82 can be easily sealed by heat welding.
  • the electrode unit 9 has the same configuration as that of the electrode unit 8.
  • the electrode unit 9 has a rectangular plate-shaped conductor 92, protective layers 93 and 93 that cover both surfaces of the conductor 92, and the peripheral portions of the surface of each protective layer 93.
  • a rectangular plate-like electrode 90, 91 having an active material and an electrolyte, and a protective frame 93 and a conductor 92 are sandwiched between the protective layers 93 and the conductors 92, and are adhered to the peripheral portions of the protective layers 93.
  • the sealant 94 is provided.
  • the sealant 94 includes an upper half 94 a and a lower half 94 b and has the same configuration as the sealant 84.
  • the conductor 92, the protective layer 93, and the sealant 94 of the electrode unit 9 are made of the same material as that of the electrode unit 8.
  • the vanadium ions or vanadium-containing ions contained in the electrodes 90 and 91 are preferably ions containing vanadium whose oxidation number changes between pentavalent and tetravalent by an oxidation-reduction reaction.
  • the ion containing pentavalent and tetravalent vanadium oxidation number changes between, VO 2+ (IV), VO 2 + (V) are exemplified.
  • the vanadium compound supported on the carbon material is vanadium oxide (IV) (VOSO 4 ⁇ nH 2 O), vanadium oxide (V) ((VO 2 ) 2 SO 4 ⁇ nH 2 O). Can be mentioned. Mixtures of these may be used. n represents an integer of 0 to 5.
  • the electrode unit 6 has the same configuration as that of the electrode unit 9, and sandwiches the rectangular plate-like conductor 62, protective layers 63 and 63 that cover both surfaces of the conductor 62, and each protective layer 63 and the conductor 62.
  • the sealant 64 is formed in a frame shape and adhered to the peripheral edge of each protective layer 63.
  • the sealant 64 includes an upper half 64 a and a lower half 64 b, and has the same configuration as the sealant 84.
  • the upper electrode unit 6 in FIG. 2 includes a rectangular plate-like electrode 60 that is provided inside the peripheral edge of the lower surface of the lower protective layer 63 and has an active material and an electrolytic solution. No electrode is provided on the upper surface of the upper protective layer 63.
  • the electrodes 60 and 61, the conductor 62, the protective layer 63, and the sealant 64 of the electrode unit 6 are made of the same material as that of the electrode unit 9.
  • the ion exchange membrane 7 is provided between the electrode units.
  • the electrodes of different polarities face each other across the ion exchange membrane 7.
  • Charging / discharging of the vanadium solid salt battery using the cell 1 is performed using the reactions of the above formulas (1) and (2). At this time, charging / discharging is performed with an external load or a charger via the positive terminal 3 and the negative terminal 4. In the reactions of the formulas (1) and (2), protons move between the electrodes via the ion exchange membrane 7.
  • the exterior bag 2 is electrolyte solution impermeable.
  • the outer bag 2 is preferably made of a laminate sheet containing a synthetic resin layer and a metal layer. Specific examples include a three-layer structure in which a metal layer is disposed between two synthetic resin layers. Examples of the material for the synthetic resin layer include polypropylene, polyethylene, polyamide such as nylon 6, nylon 66, and the like. The thickness of the synthetic resin layer is preferably 5 to 200 ⁇ m. In this case, the battery has good airtightness. Examples of the material for the metal layer include aluminum, aluminum alloy, copper, copper alloy, iron, stainless steel, titanium, and titanium alloy. The thickness of the metal layer is preferably 5 to 100 ⁇ m.
  • the thickness of the outer bag 2 is not particularly limited, but is preferably 15 to 250 ⁇ m. When the thickness is 15 to 250 ⁇ m, the battery has sufficient strength and the battery becomes compact.
  • the outer bag 2 includes a half body 21 and a half body 22, sandwiching all electrode units, aligning the half bodies 21 and 22 so that the inside faces each other, and the positive electrode terminal 3 and the negative electrode terminal 4 protrude from a part of the peripheral edge. In this state, the peripheral portion is pressed and integrated by providing the bonding portion 23.
  • the outer bag 2 may be formed of a single sheet, folded at the center in the longitudinal direction, sandwiched between all electrode units, and overlapped with the peripheral edge.
  • the conductor 82 of the electrode unit 8 has a rectangular plate-like tab 82 a that protrudes from a part of the peripheral portion in the surface direction of the conductor 82.
  • the tab 82 a is not covered with the protective layer 83.
  • the tabs 82a of each electrode unit 8 extend substantially in the horizontal direction, and are then bent twice so that all the tabs 82a overlap each other at the bonding portion 23a, and are pulled out from the bonding portion 23a.
  • the electrode units 6 and 9 are omitted.
  • the outer edge portions 84d and 84f of the sealant 84 of each electrode unit 8 are continuously provided with covering portions 84g and 84h at the portion where the tab 82a protrudes, and each covering portion 84g and 84h covers each tab 82a. In the state, it is pulled out to the outside of the bonding portion 23a. That is, the tip portions of the covering portions 84g and 84h protrude from the tip portion of the bonding portion 23a by a predetermined length.
  • the covering portions 84g and 84h are bonded in a state of being combined with each other.
  • the conductor 62 of the electrode unit 6 has a rectangular plate-like tab 62 a that protrudes from a part of the peripheral portion in the surface direction of the conductor 62, and the conductor 92 of the electrode unit 9 is A tab 92a having a rectangular plate shape protruding from a part of the peripheral portion in the surface direction of the conductor 92 is provided.
  • the electrode unit 8 is omitted.
  • the tab 62a of the lower electrode unit 6 extends in a substantially horizontal direction, and is drawn out from an adhesive portion 23b that is a part of the adhesive portion 23 of the exterior bag 2.
  • the adhesive unit 23b is overlapped with the tab 62a of the lower electrode unit 6 twice. It is bent and pulled out from the adhesive portion 23b.
  • the outer edges of the halves 64a and 64b of the sealant 64 of each electrode unit 6 are continuously provided with covering portions 64g and 64h at the protruding portion of the tab 62a.
  • 64g and 64h are drawn out to the outside of the bonding portion 23b in a state of covering the tabs 62a.
  • the covering portions 64g and 64h are bonded in a state where they are aligned with each other.
  • Covering portions 94g and 94h are connected to the outer edge portions of the halves 94a and 94b of the sealant 94 of each electrode unit 9 at the portion where the tab 92a protrudes, and each covering portion 94g and 94h is connected to each tab.
  • covering 92a In a state of covering 92a, it is drawn out to the outside of the bonding portion 23b.
  • the covering portions 94g and 94h are bonded in a state of being combined with each other.
  • the covering portions 64g and 64h and the tip portions of the covering portions 94g and 94h protrude from the tip portion of the bonding portion 23b by a predetermined length.
  • FIG. 7 is a schematic cross-sectional view showing a state where the bonding portion 23 is viewed from the front.
  • attached by heat welding is shown.
  • the widths of the covering portions 84 g and 84 h of the sealant 84 of each electrode unit 8 gradually increase from top to bottom with respect to the stacking direction of the electrode units 8.
  • the widths of the covering portions 84g and 84h in the same electrode unit 8 are equal.
  • coated parts 84g and 84h in the same electrode unit 8 may differ.
  • coated parts 84g and 84h in the same electrode unit 8 may be integrated.
  • the widths of the covering portions in the same electrode unit are equal.
  • coated part in the same electrode unit may differ.
  • the covering portions 94g and 94h and the covering portions 64g and 64h may be integrated with each other.
  • the half body 21 of the outer bag 2 corresponds to the stepped shape of the side portions of the stacked electrode units so that the adhesive portions 23a and 23b form an isosceles trapezoidal shape when viewed from the front.
  • it is formed by press drawing so as to have a convex portion.
  • Three tabs 82a covered with the covering portions 84g and 84h are sandwiched between the adhesive portion 23a and the half body 22, and two of the two tabs covered with the covering portions 64g and 64h are sandwiched between the adhesive portion 23b and the half body 22.
  • the adhesive portion 23 including the adhesive portions 23a and 23b of the outer bag 2 is thermally welded, and the inner portion of the outer bag 2
  • the electrode units 6, 8, and 9 are sealed.
  • FIG. 8 is a schematic cross-sectional view showing a state in which the half bodies 21 and 22 and the respective covering portions of the respective sealants are bonded by thermal welding.
  • the synthetic resin layers of the half bodies 21 and 22 and the covering portions of the electrode units are melted by heat, and the facing portions are bonded to each other.
  • FIG. 9 is a schematic cross-sectional view showing a case where the width of each covering portion is the same at each bonding portion.
  • the adhesive portion 23a is thickened by the lamination of the electrode units 8, and the root portion (lower electrode unit 8 side) It will be bent at a right angle.
  • the adhesive portion 23b is thickened by the lamination of the electrode units 6 and 9, and the base portion (the lower electrode unit 6 side) ) Will bend at a right angle. Therefore, when a heater is disposed outside the half bodies 21 and 22 and pressed, heat and press pressure are not applied to the side surfaces and the root portions of the bonded portions 23a and 23b. In practice, as shown in FIG. In addition, the side surfaces and the base portions of the bonding portions 23a and 23b cannot be brought into close contact with the sealants and the half body 22, and the outer bag 2 cannot be sealed.
  • the width of each covering portion of the electrode unit 8 gradually increases from the top to the bottom, and the width of each covering portion of the electrode units 6, 9, 9, 6 is increased from the top. Since the adhesive portions 23a and 23b form isosceles trapezoidal shapes corresponding to this laminated shape, the angle formed between the root portions of the adhesive portions 23a and 23b and the half body 22 becomes an acute angle. ing.
  • the three tabs 82a are further pulled out from the tips of the covering portions 84g and 84h at the bonding portion 23a, and the upper and lower tabs 82a are bent and overlapped with the central tab 82a.
  • the three superimposed tabs 82a are connected to the negative electrode terminal 4 by welding.
  • the thickness of the negative electrode terminal 4 is thicker than the thickness of one tab 82a, and good connection strength is obtained (see FIG. 4).
  • the two tabs 62a are further pulled out from the tip portions of the covering portions 64g and 64h in the bonding portion 23b, and the two tabs 92a are further pulled out from the tip portions of the covering portions 94g and 94h. Has been pulled out.
  • the two tabs 62a and the two tabs 92a are overlapped at the tip and connected to the positive terminal 3 by welding.
  • the thickness of the positive electrode terminal 3 is thicker than the thickness of one tab 62a and one tab 92a, and good connection strength is obtained (see FIG. 6).
  • the cell 1 in which each electrode unit is sealed is accommodated in a case (not shown).
  • the cell 1 according to the present embodiment is configured as described above, and the tabs 62a, 82a, and 92a are covered with the sealants 64, 84, and 94. Corrosion is prevented. Then, the covering portions 84g and 84h of the sealant 84 are easily bonded to the bonding portion 23a by heat welding while being sandwiched between the bonding portions 23a, and the tab 82a is fixed in a state of being sealed to the bonding portion 23a. Similarly, the covering portions 64g and 64h of the sealants 64 and 94 and the covering portions 94g and 94h are easily bonded to the bonding portion 23b by heat welding, and the tabs 62a and 92a are bonded to the bonding portion 23b.
  • the side portions of the stacked electrode units are stepped, and the bonding portions 23a and 23b are isosceles trapezoidal shapes. Therefore, the bonding portions 23a and 23b, each sealant, and the half body 22 Good adhesion.
  • the width of the sealant in the same electrode unit is the same, so that the stepped side portion can be obtained with a simple configuration.
  • the tabs 82a, 62a, and 92a are prevented from being corroded, and the deterioration of the battery performance is suppressed.
  • the tabs 82a protruding from the bonding portion 23a are overlapped, and the tabs 62a and 92a protruding from the bonding portion 23b are well connected to the negative electrode terminal 4 outside the main body of the outer bag 2 containing the electrode units 6, 8, and 9.
  • Overlaid and well connected to the positive terminal 3 outside the main body of the outer bag 2 the connection reliability is improved.
  • the exterior bag 2 main body can be reduced in size.
  • coated parts 84g and 84h of the sealant 84 protrudes from the adhesion part 23a
  • coated parts 94g and 94h are adhesion parts 23b. Since it protrudes more, the sealing property of the exterior bag 2 is favorable. And it is prevented that the exterior bag 2 becomes unnecessarily large.
  • FIG. The battery cell 11 according to Embodiment 2 of the present invention has the same configuration as that of the cell 1 according to Embodiment 1 except that the sealant of each electrode unit is integrated.
  • FIG. 10 is a schematic cross-sectional view showing a state in which the bonding portion 23 is viewed from the front.
  • FIG. 10 shows a state before the half bodies 21 and 22 and the respective covering portions of the sealants are bonded by thermal welding.
  • the covering portion 84k of the electrode unit 8 according to the present embodiment is integrated without being divided into upper and lower parts, and the front view has an isosceles trapezoidal shape.
  • the width of the covering portion 84k of each electrode unit 8 gradually increases from top to bottom with respect to the stacking direction of the electrode units 8.
  • the slopes of the respective covering portions 84k are connected.
  • the covering portions 64k and 94k of the electrode units 6 and 9 are also integrated without being divided into upper and lower parts, and the front view has an isosceles trapezoidal shape.
  • the width of the covering portion 64k of the upper electrode unit 6, the covering portion 94k of the upper electrode unit 9, the covering portion 94k of the lower electrode unit 9, and the covering portion 64k of the lower electrode unit 6 are as follows. , 9, 9, and 6 gradually increase from top to bottom.
  • the slopes of the covering portions 64k, 94k, 64k, and 94k are connected.
  • the half body 21 of the outer bag 2 corresponds to the shape of the side surface of the covering portion, that is, the adhesive portions 23a and 23b have an isosceles trapezoidal shape in front view, that is, the half body 21 has a convex portion. For example, it is formed by press drawing.
  • each covering portion 84k of the electrode unit 8 gradually increases from the top to the bottom, and the covering portions 64k, 94k of the electrode units 6, 9, 9, 6 are provided. , 64k, and 94k are gradually widened from top to bottom, and the bonding portions 23a and 23b form an isosceles trapezoidal shape corresponding to this laminated shape.
  • the angle formed with the body 22 is an acute angle. Therefore, when a heater is disposed on the outside of the half bodies 21 and 22 and pressed, heat and press pressure are favorably applied to the side surfaces and the root portions of the bonded portions 23a and 23b.
  • the slope of the covering portion 84k is in contact with the trapezoidal oblique side portion of the bonding portion 23a
  • the slope of the covering portion 64k, 94k, 94k, 64k is in contact with the trapezoidal oblique side portion of the bonding portion 23b.
  • the synthetic resin layers of the portions 23a and 23b and the respective covering portions are easily and satisfactorily fused, and the side surfaces and the root portions of the bonding portions 23a and 23b can be brought into close contact with the respective sealants and the half body 22, so that the outer bag 2 It can be sealed well.
  • coated parts 64k, 84k, 94k are not limited to the case where they are integrated, You may divide into the upper and lower sides.
  • FIG. 11 is a schematic cross-sectional view showing a connection portion between the negative electrode tab 82a and the negative electrode terminal 4 of the battery cell 12 according to the third embodiment of the present invention
  • FIG. 12 shows a state where the adhesive portion 23 is viewed from the front. It is a typical sectional view shown.
  • FIG. 12 shows a state before the half bodies 21 and 22 and the respective coating portions of the respective sealants are bonded by thermal welding.
  • the adhesion part 23 of the cell 12 according to the third embodiment has an adhesion part (protrusion part of claim 5) 23a protruding in a direction in which the tab 82a extends. That is, the protruding length of the adhesive portion 23a of the cell 12 is longer than the protruding length of the adhesive portion 23a of the cell 1 according to the first embodiment.
  • heat welding is performed in a state where the three tabs 82a covered with the covering portions 84g and 84h are sandwiched, and the covering portions 84g and 84h are bonded to the base end portion. .
  • the width of the covering portions 84g and 84h of each electrode unit 8 gradually increases from top to bottom with respect to the stacking direction of the electrode units 8.
  • the base end portion of the bonding portion 23a has an isosceles trapezoidal shape when viewed from the front.
  • the tab 82a protrudes from the covering portions 84g and 84h in the direction in which the bonding portion 23a extends, and the upper and lower tabs 82a are bent and overlapped with the central tab 82a.
  • the three superimposed tabs 82a are connected to the negative electrode terminal 4 by welding. Portions from the center side to the end side of the negative electrode terminal 4 are covered with sealants 41 and 42. The sealants 41 and 42 are sandwiched between the tips of the bonding portions 23a.
  • the protruding length of the bonding portion 23b is longer than the protruding length of the bonding portion 23b of the cell 1 (not shown), and the two tabs 62a covered with the covering portions 64g and 64h are also formed at the base end portion of the bonding portion 23b.
  • thermal welding is performed in a state where the two tabs 92a covered with the covering portions 94g and 94h are sandwiched.
  • the width gradually increases from top to bottom with respect to the stacking direction of the electrode units 6, 9, 9, 6.
  • the base end portion of the bonding portion 23b has an isosceles trapezoidal shape when viewed from the front.
  • tab 62a, 92a, 92a, 62a is piled up in the adhesion part 23b, and it connects with the positive electrode terminal 3 by welding.
  • Portions from the center side to the end side of the positive electrode terminal 3 are covered with sealants 31 and 32 (see FIG. 12).
  • the sealants 31 and 32 are sandwiched between the tip portions of the bonding portion 23b.
  • the width of the lower sealant 42 is wider than the width of the upper sealant 41, and the width of the lower sealant 32 is wider than the width of the upper sealant 31.
  • the half body 21 of the outer bag 2 corresponds to the above-described step shape of the sealant so that the adhesive portions 23a and 23b have an isosceles trapezoidal shape in front view, that is, the half body 21 has a convex portion. For example, it is formed by press drawing.
  • each covering portion of the electrode unit 8 gradually increases from the top to the bottom, and the width of each covering portion of the electrode units 6, 9, 9, 6 gradually increases from the top to the bottom. Since the base end portions of the bonding portions 23a and 23b form an isosceles trapezoidal shape corresponding to this laminated shape, the angle formed between the base portions of the bonding portions 23a and 23b and the half body 22 becomes an acute angle. Yes.
  • FIG. 13 is a schematic cross-sectional view showing a state in which the half body 21, the half body 22 and each sealant are bonded by thermal welding.
  • a heater is arranged outside the half bodies 21 and 22 and pressed, heat and press pressure are applied well even at the root portions of the bonded portions 23a and 23b, and the synthetic resin layer of the bonded portions 23a and 23b
  • Each covering portion is easily fused, and the base portions of the base end portions of the bonding portions 23 a and 23 b are in close contact with the half body 22.
  • variety of the lower sealant 42 is wider than the width
  • variety of the lower sealant 32 is wider than the width
  • it forms an isosceles trapezoidal shape, so that the angle formed between the base portion of the tip end portion of the bonding portions 23a and 23b and the half body 22 is an acute angle. Therefore, when a heater is disposed outside the half bodies 21 and 22 and pressed, heat and pressing pressure are favorably applied to the side surfaces and root portions of the tip portions of the bonding portions 23a and 23b. , 23b and the covering portions are easily fused, and the side surfaces and root portions of the tip portions of the adhesive portions 23a, 23b can be brought into close contact with the sealants and the half body 22, and the outer bag 2 can be It can be sealed well.
  • the sealants 31, 32, 41, 42 By increasing the thickness of the sealants 31, 32, 41, 42, the sealants 31, 32 and the tip of the adhesive portion 23b and the sealants 41, 42 and the tip of the adhesive portion 23a are heated and pressurized. It can be fused well. And it can prevent that the metal layer of adhesion part 23a, 23b and the positive electrode terminal 3 or the negative electrode terminal 4 short-circuit.
  • the tab 82a is connected to the negative electrode terminal 4 in the adhesive portion 23a and the tabs 62a and 92a are connected to the positive electrode terminal 3 in the adhesive portion 23a, the safety is better.
  • FIG. 14 is a schematic cross-sectional view showing a cell 13 of a battery according to Embodiment 4 of the present invention
  • FIG. 15 is a schematic cross-sectional view showing a state where an adhesive portion 23a is viewed from the front.
  • FIG. 15 shows a state before the half bodies 21 and 22 and the covering portions 84g and 84h are bonded together by heat welding. 15, the same parts as those in FIGS. 2 to 4 are denoted by the same reference numerals, and detailed description thereof will be omitted.
  • the cell 13 includes an exterior bag 2, a positive terminal 3 (not shown) and a negative terminal 4 protruding from a part of the peripheral edge of the exterior bag 2, two positive electrode units 5, and one negative electrode unit 8. With.
  • a battery is configured by accommodating the cell 13 alone or a combination of the cell 1 and another cell in a case (not shown).
  • the electrode unit 8 has the same configuration as the electrode unit 8 according to the first embodiment.
  • the electrode unit 5 includes an electrode 50, a conductor 52, a protective layer 53, and a sealant 54.
  • the conductor 52 has a rectangular flat plate shape, and is disposed on the inner surface of the half body 21 or the half body 22.
  • the inner surface of the conductor 52 is covered with a protective layer 53.
  • On the inner side of the peripheral edge of the inner surface of the protective layer 53 a square plate-like electrode 50 having an active material and an electrolytic solution is provided.
  • the sealant 54 has a frame shape, is bonded to the peripheral edge portion, and the half body 21 or the half body 22, and seals the conductor 52 by the half body 21 or the half body 22 and the covering portion 52.
  • the sealant 54 includes an inner edge portion 54a projecting inwardly at one end portion of the rectangular tube-shaped frame body, and an outer edge portion 54b projecting outwardly at the other end portion of the frame body. That is, the sealant 54 is configured such that the outer edge portion 54b is positioned outside the inner edge portion 54a (the outer portion of the electrode 50) in plan view.
  • the electrode 50, the conductor 52, the protective layer 53, and the sealant 54 of the electrode unit 5 are made of the same material as the electrode 60, the conductor 62, the protective layer 63, and the sealant 64 of the electrode unit 6 according to Embodiment 1. It becomes.
  • the outer edge portions 84d and 84f of the sealant 84 of the electrode unit 8 are continuously provided with covering portions 84g and 84h at the portion where the tab 82a protrudes, and the covering portions 84g and 84h cover the tab 82a. , Pulled out to the outside of the bonding portion 23a. That is, the tip portions of the covering portions 84g and 84h protrude from the tip portion of the bonding portion 23a by a predetermined length.
  • the covering portions 84g and 84h are bonded in a state of being combined with each other.
  • the width of the lower covering portion 84h is wider than the width of the upper covering portion 84g.
  • the adhesive portion 23a corresponds to the step shape of the covering portions 84g and 84h described above, that is, has an isosceles trapezoidal shape when viewed from the front, that is, the half body 21 has a convex portion, for example, press It is formed by drawing. Therefore, when a heater is disposed outside the half bodies 21 and 22 and pressed, heat and press pressure are applied well at the side surface and the root portion of the bonded portion 23a, and the synthetic resin layer of the bonded portion 23a.
  • the covering portions 84g and 84h can be easily fused, and the side surface and the root portion of the bonding portion 23a can be brought into close contact with the covering portions 84g and 84h and the half body 22.
  • the covering portions 84g and 84h and the bonding portion 23a can be favorably fused during heating and pressurization. And it can prevent that the metal layer of the adhesion part 23a and the tab 82a short-circuit.
  • the battery according to the present invention has an electrode containing an acidic or alkaline electrolyte and a rectangular plate-like tab, and covers a plurality of stacked electrode units and the plurality of electrode units.
  • a covering body having an adhesive portion that is bonded by overlapping an outer peripheral edge portion, and a sealant that covers the tab and is bonded in a state of being sandwiched between the adhesive portions, the sealant having a width that is the electrode It is characterized by being configured to gradually widen in the stacking direction of the units.
  • the tab since the tab is covered with the sealant, it is prevented from being corroded by an acidic or alkaline substance related to the electrolytic solution in the battery. Therefore, the tab can be satisfactorily connected to the positive electrode or negative electrode terminal, and a decrease in battery performance (charge / discharge performance) is suppressed.
  • the sealant is configured to be bonded in a state of being sandwiched between the bonded portions, the sealant can be easily bonded to the bonded portion by, for example, heat welding, and the tab is sealed in the bonded portion.
  • the width of the sealant of the stacked electrode units is configured to gradually increase with respect to the stacking direction of the electrode units, and the side portions of the stacked electrode units have a stepped shape or a slope shape.
  • the surface of the bonding portion facing the side portion is slanted, for example, when the bonding portion is bonded by heating and pressing, the side portion and the lower electrode unit side portion, that is, the bonding portion Heat and press pressure are also applied to the root portion, and the adhesion between the bonded portion and the sealant is good.
  • the battery according to the present invention is characterized in that, in the above-described battery, the width of the sealant is different between electrode units.
  • the stepped side portion can be obtained with a simple configuration.
  • the battery according to the present invention is characterized in that, in any one of the batteries described above, the adhesive portion has a convex portion corresponding to the stacked shape of the electrode unit and having a trapezoidal shape in front view.
  • the shape of the bonding portion corresponds to the side portion of the electrode unit, and heat and pressure can be applied from the diagonally upper side of the bonding portion toward the side surface of the bonding portion and the side portion.
  • the bonded portion and the sealant can be melted and adhered to each other, and the coated body is sealed better.
  • the battery according to the present invention is characterized in that, in any one of the batteries described above, the plurality of tabs are provided with terminals that are pulled out from a portion where the sealant is bonded and connected in a superposed state.
  • the tab is covered with the sealant and prevented from corroding, and the tabs protruding from the portion to which the sealant is bonded are overlapped, and the positive electrode or the negative electrode outside the covering body containing the electrode unit.
  • the terminal can be connected well. Therefore, the reliability of the connection is improved and the cover body can be downsized.
  • the adhesive portion has a protruding portion protruding in a direction in which the tab extends, and a plurality of the tabs are connected to the terminals inside the protruding portion. It is characterized by that.
  • the battery according to the present invention includes a second sealant that covers the terminal and is bonded in a state of being sandwiched between the leading ends of the protrusions in the battery described above, and the second sealant has a width. It consists of two different halves.
  • the second sealant can be brought into close contact with the distal end portion of the protruding portion by, for example, heat welding, and the terminal can be fixed to the distal end portion of the protruding portion.
  • the second sealant covering the terminal is formed by stacking halves with different widths, the side portion is stepped, and the surface of the protruding portion facing the side portion is slanted.
  • the second sealant and the tip of the protruding portion can be favorably fused at the time of heating and pressurizing, and the covering is made of a synthetic resin layer and a metal layer. Can be prevented from short-circuiting with the metal layer.
  • the battery according to the present invention has an electrode containing an acidic or alkaline electrolyte and an electrode unit having a rectangular plate-like tab, and a covering having an adhesive portion that covers the electrode unit and is bonded by overlapping the outer periphery. And a sealant that covers the tab and is bonded in a state of being sandwiched between the bonding portions, and the sealant includes two halves having different widths.
  • the tab since the tab is covered with the sealant, it is prevented from being corroded by an acidic or alkaline substance related to the electrolytic solution in the battery. Therefore, the tab can be satisfactorily connected to the positive electrode or negative electrode terminal, and a decrease in battery performance (charge / discharge performance) is suppressed.
  • the sealant Since the sealant is configured to be bonded in a state of being sandwiched between the bonded portions, the sealant can be easily bonded to the bonded portion by heat welding or the like, and the tab is fixed in a state of being sealed in the bonded portion.
  • the sealant covering the tab is formed by stacking halves with different widths, the side part is stepped, and the surface of the adhesive part facing the side part is slanted. For example, the adhesive part is heated and pressurized. When the bonding is performed, heat and press pressure are also applied to the side portion and the base portion of the bonding portion, and the adhesion between the bonding portion and the sealant is good.
  • each half body for example, during heating and pressurization, the sealant and the adhesive portion can be fused well, and the laminate includes a synthetic resin layer and a metal layer. When it consists of, it can prevent that this metal layer and a tab short-circuit.
  • the battery according to the present invention is characterized in that, in any one of the batteries described above, the tip of the sealant protrudes from the tip of the adhesive portion.
  • the sealing performance of the covering is improved. Moreover, the problem that the volume of the covering increases unnecessarily by causing the adhesive portion to protrude from the end portion of the sealant does not occur.
  • the battery according to the present invention is any one of the above batteries, wherein the electrode contains vanadium ions or ions containing vanadium as an active material.
  • the electrode contains vanadium ions or ions containing vanadium as an active material, and in a battery containing an acidic or alkaline electrolyte, the tab is prevented from being corroded, and the positive or negative terminal Can be connected well.
  • the present invention is not limited to the contents of Embodiments 1 to 4 described above, and various modifications can be made within the scope of the claims. In other words, embodiments obtained by combining technical means appropriately modified within the scope of the claims are also included in the technical scope of the present invention.
  • the batteries of Embodiments 1 to 4 are not limited to vanadium solid salt batteries. That is, the active material may be iron or chromium instead of vanadium, and the electrolytic solution may be alkaline instead of acidic.
  • the material, configuration, and number of each member of the cell, the polarity of the electrodes, the bonding method of the outer bag 2 and the like are not limited to those described in the first to fourth embodiments.
  • Electrode unit 50 60, 61, 80, 81, 90, 91 Electrode 52, 62, 82, 92 Conductor 62a, 82a, 92a Tab 53, 63, 83, 93 Protective layer 54, 64, 84, 94, 31, 32, 41, 42 Sealant 64a, 64b, 84a, 84b, 94a, 94b Half 54a, 84c, 84e Inner edge 54b, 84d, 84f Outer edge 64g, 64h, 84g, 84h, 94g, 64k, 84k, 94k Cover 7 Ion exchange membrane

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  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Inorganic Chemistry (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Secondary Cells (AREA)

Abstract

The objective of the present invention is to provide a battery in which a tab that is led out from an electrical conductor of an electrode unit is prevented from corroding, and is secured to a bonding portion of a covering body with good hermetic sealing characteristics. A cell (1) of a battery is provided with: a plurality of electrode units (8 (or electrode units (6, 9, 9, 6))) which are stacked on one another and each of which includes an electrode containing an acidic or alkaline electrolytic solution and a rectangular tab (82a (or tabs (62a, 92a, 92a, 62a))); a covering body (2) which covers the plurality of electrode units and which has a bonding portion (23) which overlaps and is bonded to an outer peripheral edge portion of each of the plurality of electrode units; and a sealant (84 (or sealants (64, 94, 94, 64))) which covers the tabs and is bonded while being sandwiched in the bonding portion 23. The sealant is formed in such a way that the width thereof gradually increases in the direction in which the plurality of electrode units are stacked.

Description

電池battery
　本発明は、電極及び導電体を有する複数の電極ユニットを被覆体に収容してなる電池に関する。 The present invention relates to a battery in which a plurality of electrode units each having an electrode and a conductor are accommodated in a covering.
　電池は、デジタル家電製品、電気自動車、ハイブリッド自動車、太陽光発電設備等に広く用いられている。この電池として、リチウムイオン二次電池、バナジウム固体塩電池（特許文献１）等が挙げられる。バナジウム固体塩電池等のバナジウムレドックス二次電池は、活物質の酸化還元反応を利用して充放電を行う。活物質としては、バナジウムイオン又はバナジウムを含むイオンが用いられる。 Batteries are widely used in digital home appliances, electric vehicles, hybrid vehicles, solar power generation facilities, and the like. Examples of the battery include a lithium ion secondary battery and a vanadium solid salt battery (Patent Document 1). A vanadium redox secondary battery such as a vanadium solid salt battery performs charge / discharge using an oxidation-reduction reaction of an active material. As the active material, vanadium ions or ions containing vanadium are used.
　バナジウム固体塩電池は、活物質及び酸性の電解液を有する電極と、銅又はステンレス等の金属製の導電体とを有する。このバナジウム固体塩電池においては、電極及び導電体を有する電極ユニットが複数積層された発電要素を、例えば合成樹脂層及び金属層を含むラミネートシートからなる外装袋で覆うことにより密閉する。
　具体的には、外装袋として２枚のラミネートシートを重ね、又は１枚のラミネートシートを二つ折りにし、外装袋により発電要素を厚み方向に挟み、正極端子及び負極端子が突出した状態で、外装袋の周縁部を加熱し、厚み方向に加圧して、合成樹脂層同士を融着させることにより発電要素が封止される。発電要素を外装袋に収容してなるセルは、ケースに収容される。 The vanadium solid salt battery includes an electrode having an active material and an acidic electrolyte, and a metal conductor such as copper or stainless steel. In this vanadium solid salt battery, a power generating element in which a plurality of electrode units each having an electrode and a conductor are stacked is sealed by, for example, covering with an exterior bag made of a laminate sheet including a synthetic resin layer and a metal layer.
Specifically, two laminated sheets are stacked as an outer bag, or one laminated sheet is folded in two, the power generation element is sandwiched in the thickness direction by the outer bag, and the positive electrode terminal and the negative electrode terminal protrude from the outer bag. The power generation element is sealed by heating the peripheral edge of the bag and applying pressure in the thickness direction to fuse the synthetic resin layers together. A cell formed by housing the power generation element in an exterior bag is housed in a case.
　特許文献２の電池においては、各電極ユニットの導電体の周縁部の一部からタブが引き出されており、外装袋内で、正極の電極からの各タブ同士が相互に重ね合わせて束ねられ、重ね合わされたタブに正極端子が溶接により接続されている。正極端子は外装袋の外部へ延出される。負極の電極からのタブ同士も外装袋内で重ね合わされ、重ね合わされたタブに負極端子が接続されている。 In the battery of Patent Document 2, tabs are drawn out from a part of the peripheral edge of the conductor of each electrode unit, and the tabs from the positive electrode are bundled together in an outer bag, A positive electrode terminal is connected to the overlapped tab by welding. The positive terminal is extended to the outside of the outer bag. Tabs from the negative electrode are also overlapped in the exterior bag, and the negative terminal is connected to the overlapped tab.
　以上のように構成されている電池の場合、外装袋内に酸性又はアルカリ性の電解液が存在するとき、タブが腐食される虞がある。タブが腐食された場合、電池性能が低下し、端子との接続に不良が生じることがある。 In the case of a battery configured as described above, the tab may be corroded when an acidic or alkaline electrolyte is present in the outer bag. When the tab is corroded, the battery performance is deteriorated, and the connection with the terminal may be defective.
特開２０１４－２３５８３３号公報JP 2014-235833 A 特開２００１－２５６９６０号公報JP 2001-256960 A
　本発明は、斯かる事情に鑑みてなされたものであり、電極ユニットの導電体から引き出されるタブが、腐食することが防止されるとともに、良好な密閉性を有する状態で被覆体の接着部に固定された電池を提供することを目的とする。 The present invention has been made in view of such circumstances, and the tab drawn from the conductor of the electrode unit is prevented from corroding and is attached to the adhesive portion of the covering body in a state having good sealing performance. An object is to provide a fixed battery.
　本発明に係る電池は、酸性又はアルカリ性の電解液を含有する電極、及び矩形板状のタブを各々有し、積層された複数の電極ユニットと、前記複数の電極ユニットを覆い、外周縁部を重ねて接着した接着部を有する被覆体と、前記タブを被覆し、前記接着部に挟まれた状態で接着されているシーラントとを備え、前記シーラントは、幅が、前記電極ユニットの積層方向に対し、漸次的に広くなるように構成されていることを特徴とする。 The battery according to the present invention includes an electrode containing an acidic or alkaline electrolyte and a rectangular plate-shaped tab, each covering a plurality of stacked electrode units, the plurality of electrode units, and an outer peripheral edge portion. A covering body having an adhesive portion bonded in layers, and a sealant covering the tab and adhered in a state sandwiched between the adhesive portions, the sealant having a width in the stacking direction of the electrode units. On the other hand, it is characterized by being gradually widened.
　本発明に係る電池は、酸性又はアルカリ性の電解液を含有する電極、及び矩形板状のタブを有する電極ユニットと、該電極ユニットを覆い、外周縁部を重ね合わせて接着した接着部を有する被覆体と、前記タブを被覆し、前記接着部に挟まれた状態で接着されているシーラントとを備え、前記シーラントは、幅が異なる２枚の半体からなることを特徴とする。 The battery according to the present invention has an electrode containing an acidic or alkaline electrolyte and an electrode unit having a rectangular plate-like tab, and a covering having an adhesive portion that covers the electrode unit and is bonded by overlapping the outer periphery. And a sealant that covers the tab and is bonded in a state of being sandwiched between the bonding portions, and the sealant includes two halves having different widths.
　本発明によれば、電極ユニットのタブはシーラントにより被覆されており、シーラントは、被覆体の接着部に挟まれた状態で接着されているので、タブは腐食することが防止されている。そして、積層された電極ユニットのシーラントの幅が、電極ユニットの積層方向に対して漸次的に広くなるように構成され、積層された電極ユニットの側部が階段状又は斜面状をなし、該側部に対向する接着部の面が斜めになるので、例えば接着部に加熱及び加圧を行って接着するときに、前記側部、及び接着部の根元部分にも熱及びプレス圧が良好にかかり、接着部とシーラントとの密着性が良好である。この状態で、タブが接着部に固定される。
　タブが腐食することが防止され、電極ユニットを収容した被覆体本体の外部で正極又は負極の端子と良好に接続することができるので、電池性能の低下が抑制され、接続の信頼性が向上するとともに、被覆体本体を小型化することができる。 According to the present invention, the tab of the electrode unit is covered with the sealant, and the sealant is bonded while being sandwiched between the bonding portions of the cover, so that the tab is prevented from corroding. The width of the sealant of the stacked electrode units is configured to gradually increase with respect to the stacking direction of the electrode units, and the side portions of the stacked electrode units are stepped or inclined, Since the surface of the adhesive part facing the part is slanted, for example, when heating and pressurizing the adhesive part for bonding, the side part and the base part of the adhesive part are also subjected to heat and press pressure well. The adhesion between the adhesive part and the sealant is good. In this state, the tab is fixed to the adhesive portion.
Corrosion of the tab is prevented, and the positive electrode or negative electrode terminal can be satisfactorily connected to the outside of the cover body containing the electrode unit, so that deterioration of battery performance is suppressed and connection reliability is improved. In addition, the cover body can be downsized.
実施の形態１に係るセル１を示す平面図である。3 is a plan view showing a cell 1 according to Embodiment 1. FIG. 図１のII－II線断面図である。FIG. 2 is a sectional view taken along line II-II in FIG. 図１のIII －III線一部断面図である。FIG. 3 is a partial cross-sectional view taken along line III-III in FIG. 図３の一部拡大図である。FIG. 4 is a partially enlarged view of FIG. 3. 電極ユニット８を示す平面図である。4 is a plan view showing an electrode unit 8. FIG. 正極のタブ６２ａ，９２ａと正極端子３との接続部分を示す模式的断面図である。3 is a schematic cross-sectional view showing a connection portion between positive electrode tabs 62a and 92a and positive electrode terminal 3. FIG. 接着部２３を正面から見た状態を示す模式的断面図である。It is typical sectional drawing which shows the state which looked at the adhesion part 23 from the front. 半体２１，半体２２と、各シーラントの各被覆部とが熱溶着により接着された状態を示す模式的断面図である。It is typical sectional drawing which shows the state to which the half body 21, the half body 22, and each coating | coated part of each sealant were adhere | attached by heat welding. 各接着部分で各被覆部の幅が同一である場合を示す模式的断面図である。It is typical sectional drawing which shows the case where the width | variety of each coating | coated part is the same in each adhesion part. 実施の形態２に係る接着部２３を正面から見た状態を示す模式的断面図である。It is typical sectional drawing which shows the state which looked at the adhesion part 23 which concerns on Embodiment 2 from the front. 実施の形態３に係る電池のセル１１の負極のタブ８２ａと負極端子４との接続部分を示す模式的断面図である。6 is a schematic cross-sectional view showing a connection portion between negative electrode tab 82a and negative electrode terminal 4 of battery cell 11 according to Embodiment 3. FIG. 接着部２３を正面から見た状態を示す模式的断面図である。It is typical sectional drawing which shows the state which looked at the adhesion part 23 from the front. 半体２１，半体２２と、各シーラントとが熱溶着により接着された状態を示す模式的断面図である。It is typical sectional drawing which shows the state by which the half body 21, the half body 22, and each sealant were adhere | attached by heat welding. 実施の形態４に係る電池のセルを示す模式的断面図である。6 is a schematic cross-sectional view showing a battery cell according to Embodiment 4. FIG. 接着部分２３ａを正面から見た状態を示す模式的断面図である。It is typical sectional drawing which shows the state which looked at the adhesion part 23a from the front.
　以下、本発明をその実施の形態を示す図面に基づいて詳述する。
実施の形態１．
　以下、セル１がバナジウム固体塩電池のセルである場合について説明するが、本実施の形態の電池はバナジウム固体塩電池に限定されるものではない。
　セル１単体で、又はセル１と他のセルとを組み合わせてケース（不図示）に収容することにより電池が構成される。
　セル１は、外装袋２と、外装袋２の周縁部の一部から突出した正極端子３及び負極端子４と、２つの正極の電極ユニット６と、３つの負極の電極ユニット８と、２つの正極の電極ユニット９と、６つのイオン交換膜７とを備える。図２，３の下側の電極ユニット６に、電極ユニット８、電極ユニット９、電極ユニット８、電極ユニット９、電極ユニット８、電極ユニット６が順に積層されている。 Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments thereof.
Embodiment 1 FIG.
Hereinafter, although the case where the cell 1 is a cell of a vanadium solid salt battery will be described, the battery of the present embodiment is not limited to the vanadium solid salt battery.
A battery is configured by accommodating the cell 1 alone or a combination of the cell 1 and another cell in a case (not shown).
The cell 1 includes an outer bag 2, a positive terminal 3 and a negative terminal 4 protruding from a part of the peripheral edge of the outer bag 2, two positive electrode units 6, three negative electrode units 8, two A positive electrode unit 9 and six ion exchange membranes 7 are provided. The electrode unit 8, the electrode unit 9, the electrode unit 8, the electrode unit 9, the electrode unit 8, and the electrode unit 6 are sequentially stacked on the lower electrode unit 6 in FIGS.
　電極ユニット８は、角型平板状の導電体８２と、導電体８２の両面を夫々覆う保護層８３，８３と、各保護層８３の表面の周縁部の内側に設けられ、活物質及び電解液を有する角型平板状の電極８０，８１と、各保護層８３及び導電体８２を挟み込むように額縁状をなし、各保護層８３の周縁部に接着されるシーラント８４とを備える。 The electrode unit 8 is provided on the inner side of the peripheral portion of the surface of each protective layer 83, and is provided with a rectangular plate-shaped conductor 82, protective layers 83 and 83 covering both surfaces of the conductor 82, respectively. And a sealant 84 having a frame shape so as to sandwich each of the protective layers 83 and the conductor 82 and bonded to the peripheral edge of each protective layer 83.
　以下、電極ユニット８の各部について詳述する。
　導電体８２は、銅、アルミニウム、ニッケル、チタン等の金属箔からなるのが好ましい。厚みは、５～１００μｍであるのが好ましい。厚みが１００μｍ以下である場合、電池は、軽量かつ小型化される。 Hereinafter, each part of the electrode unit 8 will be described in detail.
The conductor 82 is preferably made of a metal foil such as copper, aluminum, nickel, or titanium. The thickness is preferably 5 to 100 μm. When the thickness is 100 μm or less, the battery is lightweight and downsized.
　保護層８３，８３は、導電体８２の両面に黒鉛でコーティングすることにより形成されており、導電性かつ電解液非透過性を有する。
　保護層８３の厚みは１～１００μｍであるのが好ましい。この場合、電極８０，８１と導電体８２との電気伝導性が低下することがなく、電池の内部抵抗を小さくすることができる。
　なお、導電体８２は黒鉛でコーティングしてなる保護層８３で覆う場合に限定されるものではない。導電体８２の被覆材が導電性かつ電解液非透過性であればよく、導電性フィルム、シート状の導電性ゴム、グラファイトシート等で覆うことができる。例えば導電性の接着シートを介して、グラファイトシートを導電体８２の一面に配する構成としてもよい。 The protective layers 83 and 83 are formed by coating both surfaces of the conductor 82 with graphite, and are conductive and have no electrolyte solution permeability.
The thickness of the protective layer 83 is preferably 1 to 100 μm. In this case, the electrical conductivity between the electrodes 80 and 81 and the conductor 82 is not lowered, and the internal resistance of the battery can be reduced.
The conductor 82 is not limited to the case where it is covered with a protective layer 83 formed by coating with graphite. The covering material of the conductor 82 should just be electroconductivity and electrolyte solution non-permeable, and can be covered with an electroconductive film, a sheet-like electroconductive rubber, a graphite sheet, etc. For example, the graphite sheet may be arranged on one surface of the conductor 82 through a conductive adhesive sheet.
　電極８１は、図２における上側の保護層８３の上面の周縁部の内側に、即ち保護層８３の上面の周縁部以外の部分に設けられている。電極８０は、下側の保護層８３の下面の周縁部の内側に、即ち保護層８３の下面の周縁部以外の部分に設けられている。電極８０，８１は、保護層８３に、バナジウムイオン又はバナジウムを含むイオンを活物質として含有する固体状の化合物を含む析出物を担持させてなる。
　バナジウム化合物を含む溶液、半固体状物、又は固体状物を、保護層５２に塗布又は含侵させた後、乾燥させることで、保護層８３に析出物が担持される。半固体状物としては、バナジウム化合物に硫酸水溶液を加えたスラリー状物や、バナジウム化合物にシリカ等を加えたゲル状物等が挙げられる。具体的には活物質、バインダー、及び炭素材料を含む半固体状物であるスラリーを保護層８３に塗布し、乾燥させて、電極８０，８１を形成する例が挙げられる。
　なお、炭素フェルト等の炭素材に、バナジウム化合物を含む溶液、半固体状物、又は固体状物を塗布又は含侵させ、乾燥させることにより、活物質を含有する固体状の化合物を含む析出物を担持させた炭素材を得、該炭素材を電極８０，８１として保護層８３に設けることにしてもよい。 The electrode 81 is provided inside the peripheral edge of the upper surface of the upper protective layer 83 in FIG. 2, that is, at a portion other than the peripheral edge of the upper surface of the protective layer 83. The electrode 80 is provided inside the peripheral edge of the lower surface of the lower protective layer 83, that is, at a portion other than the peripheral edge of the lower surface of the protective layer 83. The electrodes 80 and 81 are formed by supporting a deposit containing a solid compound containing vanadium ions or ions containing vanadium as an active material on the protective layer 83.
A deposit, which is supported on the protective layer 83, is applied to the protective layer 52 after applying or impregnating the protective layer 52 with a solution, a semi-solid material, or a solid material containing a vanadium compound. Examples of the semi-solid material include a slurry material obtained by adding an aqueous sulfuric acid solution to a vanadium compound, and a gel material obtained by adding silica or the like to a vanadium compound. Specifically, an example in which a slurry that is a semi-solid material containing an active material, a binder, and a carbon material is applied to the protective layer 83 and dried to form the electrodes 80 and 81.
A precipitate containing a solid compound containing an active material by applying or impregnating a solution containing a vanadium compound, a semi-solid product, or a solid product to a carbon material such as carbon felt or drying. May be obtained, and the carbon material may be provided in the protective layer 83 as the electrodes 80 and 81.
　電極８０，８１に含まれるバナジウムイオン又はバナジウムを含むイオンは、酸化還元反応によって、２価及び３価の間で酸化数が変化するバナジウムイオンであるのが好ましい。２価及び３価の間で酸化数が変化するバナジウムイオンとしては、Ｖ2+（II）、Ｖ3+（III ）が例示される。
　負極用の活物質である、炭素材に担持させるバナジウム化合物としては、硫酸バナジウム（II）（ＶＳＯ4 ・ｎＨ2 Ｏ）、硫酸バナジウム（III ）（Ｖ2 （ＳＯ4 ）3 ・ｎＨ2 Ｏ）が挙げられる。これらの混合物が用いられ得る。ｎは、０又は１～１０の整数を示す。 The vanadium ions or vanadium-containing ions contained in the electrodes 80 and 81 are preferably vanadium ions whose oxidation number changes between divalent and trivalent by an oxidation-reduction reaction. Examples of vanadium ions whose oxidation number varies between divalent and trivalent include V 2+ (II) and V 3+ (III).
Examples of the vanadium compound supported on the carbon material, which is an active material for a negative electrode, include vanadium sulfate (II) (VSO 4 · nH 2 O), vanadium sulfate (III) (V 2 (SO 4 ) 3 · nH 2 O). Is mentioned. Mixtures of these can be used. n represents 0 or an integer of 1 to 10.
　電極８０，８１に含まれる電解液は、硫酸水溶液であるのが好ましい。硫酸水溶液として、例えば硫酸の濃度が９０質量％未満の硫酸を用いることができる。電解液は、電池のＳＯＣを０～１００％まで取り得るのに過不足のない量である。電解液の量は、例えばバナジウム化合物１００ｇに対して、２Ｍ（ｍｏｌ／Ｌ）の硫酸７０ｍＬである。 The electrolyte contained in the electrodes 80 and 81 is preferably a sulfuric acid aqueous solution. As the sulfuric acid aqueous solution, for example, sulfuric acid having a sulfuric acid concentration of less than 90% by mass can be used. The amount of the electrolyte is not excessive or deficient so that the SOC of the battery can be taken from 0 to 100%. The amount of the electrolytic solution is, for example, 70 mL of 2M (mol / L) sulfuric acid with respect to 100 g of the vanadium compound.
　シーラント８４は上述したように額縁状をなし、上側の半体８４ａと下側の半体８４ｂとを接着してなる。半体８４ａは、角筒状の枠本体の上端部に、内側に張り出した内側縁部８４ｃを備え、枠本体の下端部に、外側に張り出した外側縁部８４ｄを備える。半体８４ｂは、角筒状の枠本体の下端部に、内側に張り出した内側縁部８４ｅを備え、枠本体の上端部に、外側に張り出した外側縁部８４ｆを備える。 The sealant 84 has a frame shape as described above, and is formed by adhering the upper half 84a and the lower half 84b. The half body 84a includes an inner edge portion 84c projecting inward at the upper end portion of the rectangular tube-shaped frame main body, and an outer edge portion 84d projecting outward at the lower end portion of the frame main body. The half body 84b includes an inner edge portion 84e projecting inwardly at the lower end portion of the rectangular tube-shaped frame body, and an outer edge portion 84f projecting outward at the upper end portion of the frame body.
　シーラント８４の内側縁部８４ｃ，８４ｅは保護層８３，８３の表面の周縁部に接着されており、外側縁部８４ｄと８４ｆとを互いに合わせた状態で接着されている。導電体８２は、保護層８３，８３、及びシーラント８４により封止されている。なお、導電体８２の側面はシーラント８４に接着されていてもよく、接着されていなくてもよい。 The inner edge portions 84c and 84e of the sealant 84 are bonded to the peripheral edge portions of the surfaces of the protective layers 83 and 83, and the outer edge portions 84d and 84f are bonded together. The conductor 82 is sealed with protective layers 83 and 83 and a sealant 84. Note that the side surface of the conductor 82 may or may not be bonded to the sealant 84.
　シーラント８４は電解液非透過性であり、材料としては、例えばポリプロピレン又はポリエチレン等が挙げられる。ポロプロピレン又はポリエチレン等を用いることにより、熱溶着で容易に導電体８２を封止することが可能となる。 Sealant 84 is impermeable to electrolyte solution, and examples of the material include polypropylene or polyethylene. By using polypropylene or polyethylene, the conductor 82 can be easily sealed by heat welding.
　電極ユニット９は電極ユニット８と同様の構成を有し、角型平板状の導電体９２と、導電体９２の両面を夫々覆う保護層９３，９３と、各保護層９３の表面の周縁部の内側に設けられ、活物質及び電解液を有する角型平板状の電極９０，９１と、各保護層９３及び導電体９２を挟み込むように額縁状をなし、各保護層９３の周縁部に接着されるシーラント９４とを備える。シーラント９４は、上側の半体９４ａと下側の半体９４ｂとを備え、シーラント８４と同様の構成を有する。
　電極ユニット９の導電体９２、保護層９３、シーラント９４は電極ユニット８と同様の材料を用いてなる。 The electrode unit 9 has the same configuration as that of the electrode unit 8. The electrode unit 9 has a rectangular plate-shaped conductor 92, protective layers 93 and 93 that cover both surfaces of the conductor 92, and the peripheral portions of the surface of each protective layer 93. A rectangular plate- like electrode 90, 91 having an active material and an electrolyte, and a protective frame 93 and a conductor 92 are sandwiched between the protective layers 93 and the conductors 92, and are adhered to the peripheral portions of the protective layers 93. The sealant 94 is provided. The sealant 94 includes an upper half 94 a and a lower half 94 b and has the same configuration as the sealant 84.
The conductor 92, the protective layer 93, and the sealant 94 of the electrode unit 9 are made of the same material as that of the electrode unit 8.
　電極９０，９１に含まれるバナジウムイオン又はバナジウムを含むイオンは、酸化還元反応によって、５価及び４価の間で酸化数が変化するバナジウムを含むイオンであるのが好ましい。５価及び４価の間で酸化数が変化するバナジウムを含むイオンとしては、ＶＯ2+（IV）、ＶＯ2 +（V ）が例示される。 The vanadium ions or vanadium-containing ions contained in the electrodes 90 and 91 are preferably ions containing vanadium whose oxidation number changes between pentavalent and tetravalent by an oxidation-reduction reaction. The ion containing pentavalent and tetravalent vanadium oxidation number changes between, VO 2+ (IV), VO 2 + (V) are exemplified.
　正極用の活物質として、炭素材に担持させるバナジウム化合物は、酸化硫酸バナジウム（IV）（ＶＯＳＯ4 ・ｎＨ2 Ｏ）、酸化硫酸バナジウム（V）（（ＶＯ2 ）2 ＳＯ4 ・ｎＨ2 Ｏ）を挙げることができる。これらの混合物を用いてもよい。ｎは、０～５の整数を示す。 As the active material for the positive electrode, the vanadium compound supported on the carbon material is vanadium oxide (IV) (VOSO 4 · nH 2 O), vanadium oxide (V) ((VO 2 ) 2 SO 4 · nH 2 O). Can be mentioned. Mixtures of these may be used. n represents an integer of 0 to 5.
　電極ユニット６は電極ユニット９と同様の構成を有し、角型平板状の導電体６２と、導電体６２の両面を夫々覆う保護層６３，６３と、各保護層６３及び導電体６２を挟み込むように額縁状をなし、各保護層６３の周縁部に接着されるシーラント６４とを備える。シーラント６４は、上側の半体６４ａと下側の半体６４ｂとを備え、シーラント８４と同様の構成を有する。
　図２における上側の電極ユニット６は、下側の保護層６３の下面の周縁部の内側に設けられ、活物質及び電解液を有する角型平板状の電極６０を有する。上側の保護層６３の上面には電極は設けられていない。
　図２における下側の電極ユニット６は、上側の保護層６３の上面の周縁部の内側に設けられ、活物質及び電解液を有する角型平板状の電極６１を有する。下側の保護層６３の下面には電極は設けられていない。
　電極ユニット６の電極６０，６１、導電体６２、保護層６３、シーラント６４は電極ユニット９と同様の材料を用いてなる。 The electrode unit 6 has the same configuration as that of the electrode unit 9, and sandwiches the rectangular plate-like conductor 62, protective layers 63 and 63 that cover both surfaces of the conductor 62, and each protective layer 63 and the conductor 62. The sealant 64 is formed in a frame shape and adhered to the peripheral edge of each protective layer 63. The sealant 64 includes an upper half 64 a and a lower half 64 b, and has the same configuration as the sealant 84.
The upper electrode unit 6 in FIG. 2 includes a rectangular plate-like electrode 60 that is provided inside the peripheral edge of the lower surface of the lower protective layer 63 and has an active material and an electrolytic solution. No electrode is provided on the upper surface of the upper protective layer 63.
The lower electrode unit 6 in FIG. 2 includes a rectangular plate-like electrode 61 that is provided inside the peripheral edge of the upper surface of the upper protective layer 63 and has an active material and an electrolytic solution. No electrode is provided on the lower surface of the lower protective layer 63.
The electrodes 60 and 61, the conductor 62, the protective layer 63, and the sealant 64 of the electrode unit 6 are made of the same material as that of the electrode unit 9.
　イオン交換膜７は、各電極ユニットの間に設けられている。イオン交換膜７を挟んで、異なる極性の電極が対向する。 The ion exchange membrane 7 is provided between the electrode units. The electrodes of different polarities face each other across the ion exchange membrane 7.
　電極間において、下記式（１）及び（２）の反応が生じる。
正極：ＶＯＸ2 ・ｎＨ2 Ｏ（ｓ）⇔ＶＯ2 Ｘ・（ｎ－１）Ｈ2 Ｏ（ｓ）＋ＨＸ＋Ｈ+ ＋ｅ- …（１）
負極：ＶＸ3 ・ｎＨ2 Ｏ（ｓ）＋Ｈ+ ＋ｅ- ⇔ＶＸ2 ・ｎＨ2 Ｏ（ｓ）＋ＨＸ…（２）
　式中、Ｘは１価の陰イオンを表す。Ｘがｍ価の陰イオンである場合、結合係数（１／ｍ）が考慮される。ｎは種々の値をとり得る。 Reactions of the following formulas (1) and (2) occur between the electrodes.
Positive electrode: VOX 2 · nH 2 O (s) ⇔VO 2 X · (n−1) H 2 O (s) + HX + H + + e − (1)
Negative electrode: VX 3 · nH 2 O (s) + H + + e − ⇔VX 2 · nH 2 O (s) + HX (2)
In the formula, X represents a monovalent anion. When X is an m-valent anion, the coupling coefficient (1 / m) is considered. n can take various values.
　上述の式（１）及び（２）の反応を利用してセル１を用いたバナジウム固体塩電池の充放電が行われる。このとき、正極端子３，負極端子４を介して、外部の負荷又は充電器等との間で充放電が行われる。式（１）及び（２）の反応においてイオン交換膜７を介して電極間でプロトンが移動する。 Charging / discharging of the vanadium solid salt battery using the cell 1 is performed using the reactions of the above formulas (1) and (2). At this time, charging / discharging is performed with an external load or a charger via the positive terminal 3 and the negative terminal 4. In the reactions of the formulas (1) and (2), protons move between the electrodes via the ion exchange membrane 7.
　外装袋２は電解液非透過性である。外装袋２は、合成樹脂層及び金属層を含有するラミネートシートからなるのが好ましい。具体的には、２つの合成樹脂層の間に金属層を配置した３層の構造である場合等が挙げられる。
　合成樹脂層の材料としては、ポリプロピレン、ポリエチレン、ナイロン６，ナイロン６６等のポリアミド等が挙げられる。合成樹脂層の厚みは、５～２００μｍであるのが好ましい。この場合、電池は、良好な気密性を有する。
　金属層の材料としては、アルミニウム、アルミニウム合金、銅、銅合金、鉄、ステンレス、チタン、チタン合金等が挙げられる。金属層の厚みは、５～１００μｍであるのが好ましい。この場合、金属層にピンホール等を発生させることなく、良好な遮水性を保持することができる。
　外装袋２の厚みは特に限定されないが、１５～２５０μｍであるのが好ましい。厚みが１５～２５０μｍである場合、十分な強度を有するとともに、電池がコンパクトになる。 The exterior bag 2 is electrolyte solution impermeable. The outer bag 2 is preferably made of a laminate sheet containing a synthetic resin layer and a metal layer. Specific examples include a three-layer structure in which a metal layer is disposed between two synthetic resin layers.
Examples of the material for the synthetic resin layer include polypropylene, polyethylene, polyamide such as nylon 6, nylon 66, and the like. The thickness of the synthetic resin layer is preferably 5 to 200 μm. In this case, the battery has good airtightness.
Examples of the material for the metal layer include aluminum, aluminum alloy, copper, copper alloy, iron, stainless steel, titanium, and titanium alloy. The thickness of the metal layer is preferably 5 to 100 μm. In this case, good water shielding properties can be maintained without generating pinholes or the like in the metal layer.
The thickness of the outer bag 2 is not particularly limited, but is preferably 15 to 250 μm. When the thickness is 15 to 250 μm, the battery has sufficient strength and the battery becomes compact.
　外装袋２は半体２１と半体２２とからなり、全電極ユニットを挟み、半体２１，２２を内側が対向するように合わせ、周縁部の一部から正極端子３及び負極端子４が突出する状態で、周縁部を圧接し、接着部２３を設けることで一体化されている。
　なお、外装袋２は一枚のシートからなり、長手方向の中央部で折り曲げて全電極ユニットを挟み、周縁部を重ねて接着したものであってもよい。 The outer bag 2 includes a half body 21 and a half body 22, sandwiching all electrode units, aligning the half bodies 21 and 22 so that the inside faces each other, and the positive electrode terminal 3 and the negative electrode terminal 4 protrude from a part of the peripheral edge. In this state, the peripheral portion is pressed and integrated by providing the bonding portion 23.
The outer bag 2 may be formed of a single sheet, folded at the center in the longitudinal direction, sandwiched between all electrode units, and overlapped with the peripheral edge.
　以下、導電体と正極端子３，負極端子４との接続について説明する。
　図３～図５に示すように、電極ユニット８の導電体８２は、周縁部の一部から導電体８２の面方向に突出する矩形板状のタブ８２ａを有する。タブ８２ａは保護層８３に覆われていない。
　各電極ユニット８のタブ８２ａは略水平方向に延びた後、接着部分２３ａにおいて全てのタブ８２ａが重なるように２度屈曲し、接着部分２３ａから外部へ引き出されている。なお、図４において電極ユニット６及び９は省略している。 Hereinafter, the connection between the conductor and the positive terminal 3 and the negative terminal 4 will be described.
As shown in FIGS. 3 to 5, the conductor 82 of the electrode unit 8 has a rectangular plate-like tab 82 a that protrudes from a part of the peripheral portion in the surface direction of the conductor 82. The tab 82 a is not covered with the protective layer 83.
The tabs 82a of each electrode unit 8 extend substantially in the horizontal direction, and are then bent twice so that all the tabs 82a overlap each other at the bonding portion 23a, and are pulled out from the bonding portion 23a. In FIG. 4, the electrode units 6 and 9 are omitted.
　各電極ユニット８のシーラント８４の外側縁部８４ｄ，８４ｆには、タブ８２ａが突出している部分において被覆部８４ｇ，８４ｈが連設されており、各被覆部８４ｇ，８４ｈは各タブ８２ａを覆った状態で、接着部分２３ａの外側に引き出されている。即ち被覆部８４ｇ，８４ｈの先端部は、接着部分２３ａの先端部から所定長、突出している。被覆部８４ｇと８４ｈとは互いに合わせた状態で接着されている。 The outer edge portions 84d and 84f of the sealant 84 of each electrode unit 8 are continuously provided with covering portions 84g and 84h at the portion where the tab 82a protrudes, and each covering portion 84g and 84h covers each tab 82a. In the state, it is pulled out to the outside of the bonding portion 23a. That is, the tip portions of the covering portions 84g and 84h protrude from the tip portion of the bonding portion 23a by a predetermined length. The covering portions 84g and 84h are bonded in a state of being combined with each other.
　図６に示すように、電極ユニット６の導電体６２は、周縁部の一部から導電体６２の面方向に突出する矩形板状のタブ６２ａを有し、電極ユニット９の導電体９２は、周縁部の一部から導電体９２の面方向に突出する矩形板状のタブ９２ａを有する。図６において電極ユニット８は省略している。
　下側の電極ユニット６のタブ６２ａは略水平方向に延び、外装袋２の接着部２３の一部である接着部分２３ｂから外部に引き出されている。
　電極ユニット９，９、及び上側の電極ユニット６のタブ９２ａ，９２ａ、及びタブ６２ａは略水平方向に延びた後、接着部分２３ｂにおいて、下側の電極ユニット６のタブ６２ａと重なるように２度屈曲し、接着部分２３ｂから外部へ引き出されている。 As shown in FIG. 6, the conductor 62 of the electrode unit 6 has a rectangular plate-like tab 62 a that protrudes from a part of the peripheral portion in the surface direction of the conductor 62, and the conductor 92 of the electrode unit 9 is A tab 92a having a rectangular plate shape protruding from a part of the peripheral portion in the surface direction of the conductor 92 is provided. In FIG. 6, the electrode unit 8 is omitted.
The tab 62a of the lower electrode unit 6 extends in a substantially horizontal direction, and is drawn out from an adhesive portion 23b that is a part of the adhesive portion 23 of the exterior bag 2.
After the tabs 92a and 92a and the tab 62a of the electrode units 9 and 9 and the upper electrode unit 6 extend substantially in the horizontal direction, the adhesive unit 23b is overlapped with the tab 62a of the lower electrode unit 6 twice. It is bent and pulled out from the adhesive portion 23b.
　各電極ユニット６のシーラント６４の半体６４ａ，６４ｂの各外側縁部には、シーラント８４と同様に、タブ６２ａが突出している部分において被覆部６４ｇ，６４ｈが連設されており、各被覆部６４ｇ，６４ｈは各タブ６２ａを覆った状態で、接着部分２３ｂの外側に引き出されている。被覆部６４ｇと６４ｈとは互いに合わせた状態で接着されている。
　各電極ユニット９のシーラント９４の半体９４ａ，９４ｂの各外側縁部には、タブ９２ａが突出している部分において被覆部９４ｇ，９４ｈが連設されており、各被覆部９４ｇ，９４ｈは各タブ９２ａを覆った状態で、接着部分２３ｂの外側に引き出されている。被覆部９４ｇと９４ｈとは互いに合わせた状態で接着されている。各被覆部６４ｇ，６４ｈ、及び各被覆部９４ｇ，９４ｈの先端部は、接着部分２３ｂの先端部から所定長、突出している。 Like the sealant 84, the outer edges of the halves 64a and 64b of the sealant 64 of each electrode unit 6 are continuously provided with covering portions 64g and 64h at the protruding portion of the tab 62a. 64g and 64h are drawn out to the outside of the bonding portion 23b in a state of covering the tabs 62a. The covering portions 64g and 64h are bonded in a state where they are aligned with each other.
Covering portions 94g and 94h are connected to the outer edge portions of the halves 94a and 94b of the sealant 94 of each electrode unit 9 at the portion where the tab 92a protrudes, and each covering portion 94g and 94h is connected to each tab. In a state of covering 92a, it is drawn out to the outside of the bonding portion 23b. The covering portions 94g and 94h are bonded in a state of being combined with each other. The covering portions 64g and 64h and the tip portions of the covering portions 94g and 94h protrude from the tip portion of the bonding portion 23b by a predetermined length.
　図７は、接着部２３を正面から見た状態を示す模式的断面図である。図７においては、半体２１，半体２２と、各シーラントの各被覆部とが熱溶着により接着される前の状態を示している。
　図７に示すように、各電極ユニット８のシーラント８４の被覆部８４ｇ，８４ｈの幅は、電極ユニット８の積層方向に対し、上から下へ漸次的に広くなっている。同一の電極ユニット８内の被覆部８４ｇ，８４ｈの幅は等しい。なお、同一の電極ユニット８内の被覆部８４ｇ，８４ｈの幅は異なっていてもよい。また、同一の電極ユニット８内の被覆部８４ｇ，８４ｈは一体化されていてもよい。
　そして、上側の電極ユニット６のシーラント６４の被覆部６４ｇ，６４ｈ、上側の電極ユニット９のシーラント９４の被覆部９４ｇ，９４ｈ、下側の電極ユニット９の被覆部９４ｇ，９４ｈ、下側の電極ユニット６の被覆部６４ｇ，６４ｈの幅は、電極ユニット６，９，９，６の積層方向に対し、上から下へ漸次的に広くなっている。同一の電極ユニット内の被覆部の幅は等しい。なお、同一の電極ユニット内の被覆部の幅は異なっていてもよい。また、被覆部９４ｇ，９４ｈ、被覆部６４ｇ，６４ｈは夫々一体化されていてもよい。 FIG. 7 is a schematic cross-sectional view showing a state where the bonding portion 23 is viewed from the front. In FIG. 7, the state before the half bodies 21 and 22 and each coating | coated part of each sealant are adhere | attached by heat welding is shown.
As shown in FIG. 7, the widths of the covering portions 84 g and 84 h of the sealant 84 of each electrode unit 8 gradually increase from top to bottom with respect to the stacking direction of the electrode units 8. The widths of the covering portions 84g and 84h in the same electrode unit 8 are equal. In addition, the width | variety of the coating | coated parts 84g and 84h in the same electrode unit 8 may differ. Moreover, the coating | coated parts 84g and 84h in the same electrode unit 8 may be integrated.
Then, the covering portions 64g and 64h of the sealant 64 of the upper electrode unit 6, the covering portions 94g and 94h of the sealant 94 of the upper electrode unit 9, the covering portions 94g and 94h of the lower electrode unit 9, and the lower electrode unit 6, the widths of the covering portions 64g and 64h gradually increase from top to bottom with respect to the stacking direction of the electrode units 6, 9, 9, and 6. The widths of the covering portions in the same electrode unit are equal. In addition, the width | variety of the coating | coated part in the same electrode unit may differ. The covering portions 94g and 94h and the covering portions 64g and 64h may be integrated with each other.
　外装袋２の半体２１は、積層された電極ユニットの側部の階段状の形状に対応して、接着部分２３ａ，２３ｂが正面視で等脚台形状をなすように、即ち半体２１が凸部を有するように、例えばプレス絞り加工により形成されている。 The half body 21 of the outer bag 2 corresponds to the stepped shape of the side portions of the stacked electrode units so that the adhesive portions 23a and 23b form an isosceles trapezoidal shape when viewed from the front. For example, it is formed by press drawing so as to have a convex portion.
　接着部分２３ａと半体２２とにより、被覆部８４ｇ，８４ｈに覆われた３本のタブ８２ａが挟まれ、接着部分２３ｂと半体２２とにより、被覆部６４ｇ，６４ｈに覆われた２本のタブ６２ａ、及び被覆部９４ｇ，９４ｈに覆われた２本のタブ９２ａが挟まれた状態で、外装袋２の接着部分２３ａ，２３ｂを含む接着部２３に熱溶着が施され、外装袋２内部の各電極ユニット６，８，９が封止される。 Three tabs 82a covered with the covering portions 84g and 84h are sandwiched between the adhesive portion 23a and the half body 22, and two of the two tabs covered with the covering portions 64g and 64h are sandwiched between the adhesive portion 23b and the half body 22. With the tab 62a and the two tabs 92a covered by the covering portions 94g and 94h being sandwiched, the adhesive portion 23 including the adhesive portions 23a and 23b of the outer bag 2 is thermally welded, and the inner portion of the outer bag 2 The electrode units 6, 8, and 9 are sealed.
　熱溶着は、半体２１，２２の外側にヒータを配した状態でプレスすることにより行われる。熱により半体２１，２２の合成樹脂層、及び各電極ユニットの被覆部を溶融させ、プレスすることで密にして、前記合成樹脂層と被覆部とを融着させる。
　図８は、半体２１，半体２２と、各シーラントの各被覆部とが熱溶着により接着された状態を示す模式的断面図である。熱により半体２１，２２の合成樹脂層、及び各電極ユニットの被覆部が溶融し、対向する部分同士が接着されている。 The heat welding is performed by pressing in a state where a heater is disposed outside the halves 21 and 22. The synthetic resin layers of the halves 21 and 22 and the covering portions of the respective electrode units are melted by heat and pressed to be dense, and the synthetic resin layer and the covering portion are fused.
FIG. 8 is a schematic cross-sectional view showing a state in which the half bodies 21 and 22 and the respective covering portions of the respective sealants are bonded by thermal welding. The synthetic resin layers of the half bodies 21 and 22 and the covering portions of the electrode units are melted by heat, and the facing portions are bonded to each other.
　ここで、各電極ユニットの被覆部の幅が同一である場合、以下の問題が生じる。
　図９は、各接着部分で各被覆部の幅が同一である場合を示す模式的断面図である。
　図９に示すように全ての電極ユニット８の被覆部８４ｇと被覆部８４ｈとの幅が等しい場合、接着部分２３ａは電極ユニット８の積層により厚みが生じ、根元部分（下層の電極ユニット８側）で直角に折れ曲がることになる。同様に、電極ユニット６，９の被覆部６４ｇ，６４ｈ，９４ｇ，９４ｈの幅が全て等しい場合、接着部分２３ｂは電極ユニット６，９の積層により厚みが生じ、根元部分（下層の電極ユニット６側）で直角に折れ曲がることになる。
　従って、半体２１，２２の外側にヒータを配し、プレスした場合に、接着部分２３ａ，２３ｂの側面、及び根元部分に熱及びプレス圧がかからず、実際には、図９に示すように接着部分２３ａ，２３ｂの側面及び根元部分を各シーラント及び半体２２に密着させることはできず、外装袋２を密閉できないことになる。 Here, when the width | variety of the coating part of each electrode unit is the same, the following problems arise.
FIG. 9 is a schematic cross-sectional view showing a case where the width of each covering portion is the same at each bonding portion.
As shown in FIG. 9, when the widths of the covering portions 84g and the covering portions 84h of all the electrode units 8 are equal, the adhesive portion 23a is thickened by the lamination of the electrode units 8, and the root portion (lower electrode unit 8 side) It will be bent at a right angle. Similarly, when the widths of the covering portions 64g, 64h, 94g, and 94h of the electrode units 6 and 9 are all equal, the adhesive portion 23b is thickened by the lamination of the electrode units 6 and 9, and the base portion (the lower electrode unit 6 side) ) Will bend at a right angle.
Therefore, when a heater is disposed outside the half bodies 21 and 22 and pressed, heat and press pressure are not applied to the side surfaces and the root portions of the bonded portions 23a and 23b. In practice, as shown in FIG. In addition, the side surfaces and the base portions of the bonding portions 23a and 23b cannot be brought into close contact with the sealants and the half body 22, and the outer bag 2 cannot be sealed.
　本実施の形態の場合、上述したように、電極ユニット８の各被覆部の幅が上から下へ漸次的に広くなり、電極ユニット６，９，９，６の各被覆部の幅が上から下へ漸次的に広くなり、接着部分２３ａ，２３ｂはこの積層形状に対応して等脚台形状をなすので、接着部分２３ａ，２３ｂの根元部分と、半体２２とのなす角度は鋭角になっている。
　積層された電極ユニットの階段状の側部に、接着部分２３ａ，２３ｂの等脚台形の斜辺部分が対向しており、半体２１，２２の外側にヒータを配し、プレスした場合に、前記側部、並びに接着部分２３ａ，２３ｂの側面及び根元部分においても熱及びプレス圧が良好にかかることになる。よって、接着部分２３ａ，２３ｂの合成樹脂層と各被覆部とが容易に融着し、接着部分２３ａ，２３ｂの側面及び根元部分を各シーラント及び半体２２に密着させることができ、外装袋２を良好に密閉することができる。
　ここで、プレスが半体２１の凹凸形状に対応する形状を有するように構成した場合、斜め方向に圧力をかけることができるので、接着部分２３ａ，２３ｂの合成樹脂層と各シーラントとがより良好に融着する。 In the case of the present embodiment, as described above, the width of each covering portion of the electrode unit 8 gradually increases from the top to the bottom, and the width of each covering portion of the electrode units 6, 9, 9, 6 is increased from the top. Since the adhesive portions 23a and 23b form isosceles trapezoidal shapes corresponding to this laminated shape, the angle formed between the root portions of the adhesive portions 23a and 23b and the half body 22 becomes an acute angle. ing.
When the sloped sides of the isosceles trapezoids of the adhesive portions 23a, 23b are opposed to the stepped side portions of the stacked electrode units, and a heater is disposed outside the halves 21, 22 and pressed, The heat and the press pressure are satisfactorily applied also to the side portions and the side surfaces and the root portions of the bonding portions 23a and 23b. Therefore, the synthetic resin layers of the adhesive portions 23a and 23b and the respective covering portions can be easily fused, and the side surfaces and root portions of the adhesive portions 23a and 23b can be brought into close contact with the respective sealants and the half body 22, and the outer bag 2 Can be sealed well.
Here, when the press is configured to have a shape corresponding to the uneven shape of the half body 21, since pressure can be applied in an oblique direction, the synthetic resin layers of the bonding portions 23a and 23b and the respective sealants are better. To fuse.
　３本のタブ８２ａは接着部分２３ａにおいて、被覆部８４ｇ，８４ｈの先端部から剥き出しの状態でさらに引き出され、上側及び下側のタブ８２ａは折れ曲がって、中央側のタブ８２ａに重ね合わされている。重ね合わされた３本のタブ８２ａは、溶接により負極端子４に接続されている。負極端子４の厚みは１本のタブ８２ａの厚みより厚く、良好な接続強度が得られている（図４参照）。 The three tabs 82a are further pulled out from the tips of the covering portions 84g and 84h at the bonding portion 23a, and the upper and lower tabs 82a are bent and overlapped with the central tab 82a. The three superimposed tabs 82a are connected to the negative electrode terminal 4 by welding. The thickness of the negative electrode terminal 4 is thicker than the thickness of one tab 82a, and good connection strength is obtained (see FIG. 4).
　同様に、接着部分２３ｂにおいて２本のタブ６２ａは被覆部６４ｇ，６４ｈの先端部から剥き出しの状態でさらに引き出され、２本のタブ９２ａは被覆部９４ｇ，９４ｈの先端部から剥き出しの状態でさらに引き出されている。２本のタブ６２ａ、及び２本のタブ９２ａは先端部で重ね合わされ、溶接により正極端子３に接続されている。正極端子３の厚みは１本のタブ６２ａ及び１本のタブ９２ａの厚みより厚く、良好な接続強度が得られている（図６参照）。
　各電極ユニットを封止したセル１は、ケース（不図示）に収容される。 Similarly, the two tabs 62a are further pulled out from the tip portions of the covering portions 64g and 64h in the bonding portion 23b, and the two tabs 92a are further pulled out from the tip portions of the covering portions 94g and 94h. Has been pulled out. The two tabs 62a and the two tabs 92a are overlapped at the tip and connected to the positive terminal 3 by welding. The thickness of the positive electrode terminal 3 is thicker than the thickness of one tab 62a and one tab 92a, and good connection strength is obtained (see FIG. 6).
The cell 1 in which each electrode unit is sealed is accommodated in a case (not shown).
　本実施の形態のセル１は以上のように構成されており、タブ６２ａ，８２ａ，９２ａがシーラント６４，８４，９４に覆われているので、外装袋２内で電解液に係る酸性の物質により腐食されることが防止されている。
　そして、シーラント８４の被覆部８４ｇ，８４ｈが接着部分２３ａに挟まれた状態で、熱溶着により接着部分２３ａに容易に接着され、タブ８２ａが接着部分２３ａに密閉された状態で固定されている。同様に、シーラント６４，９４の被覆部６４ｇ，６４ｈ、被覆部９４ｇ，９４ｈが接着部分２３ｂに挟まれた状態で、熱溶着により接着部分２３ｂに容易に接着され、タブ６２ａ，９２ａが接着部分２３ｂに密閉された状態で固定されている。
　ここで、上述したように、積層された電極ユニットの側部が階段状をなし、接着部分２３ａ，２３ｂが等脚台形状をなすので、接着部分２３ａ，２３ｂと各シーラントと半体２２との密着性が良好である。
　本実施の形態においては、同一の電極ユニット内のシーラントの幅は同幅であるので、簡単な構成で、階段状の前記側部を得ることができる。 The cell 1 according to the present embodiment is configured as described above, and the tabs 62a, 82a, and 92a are covered with the sealants 64, 84, and 94. Corrosion is prevented.
Then, the covering portions 84g and 84h of the sealant 84 are easily bonded to the bonding portion 23a by heat welding while being sandwiched between the bonding portions 23a, and the tab 82a is fixed in a state of being sealed to the bonding portion 23a. Similarly, the covering portions 64g and 64h of the sealants 64 and 94 and the covering portions 94g and 94h are easily bonded to the bonding portion 23b by heat welding, and the tabs 62a and 92a are bonded to the bonding portion 23b. It is fixed in a sealed state.
Here, as described above, the side portions of the stacked electrode units are stepped, and the bonding portions 23a and 23b are isosceles trapezoidal shapes. Therefore, the bonding portions 23a and 23b, each sealant, and the half body 22 Good adhesion.
In the present embodiment, the width of the sealant in the same electrode unit is the same, so that the stepped side portion can be obtained with a simple configuration.
　タブ８２ａ，６２ａ，９２ａが腐食することが防止されており、電池性能の低下が抑制されている。接着部分２３ａから突出したタブ８２ａは重ね合わされて、電極ユニット６，８，９を収容した外装袋２本体の外部で負極端子４と良好に接続され、接着部分２３ｂから突出したタブ６２ａ，９２ａは重ね合わされて、外装袋２本体の外部で正極端子３と良好に接続され、接続の信頼性が向上している。そして、外装袋２本体の内部でタブと正極端子３又は負極端子４と接続する場合と異なり、外装袋２本体を小型化することができる。 The tabs 82a, 62a, and 92a are prevented from being corroded, and the deterioration of the battery performance is suppressed. The tabs 82a protruding from the bonding portion 23a are overlapped, and the tabs 62a and 92a protruding from the bonding portion 23b are well connected to the negative electrode terminal 4 outside the main body of the outer bag 2 containing the electrode units 6, 8, and 9. Overlaid and well connected to the positive terminal 3 outside the main body of the outer bag 2, the connection reliability is improved. And unlike the case where it connects with the tab and the positive electrode terminal 3 or the negative electrode terminal 4 inside the exterior bag 2 main body, the exterior bag 2 main body can be reduced in size.
　そして、本実施の形態においては、シーラント８４の被覆部８４ｇ，８４ｈの先端部が接着部分２３ａより突出し、シーラント６４，９４の被覆部６４ｇ，６４ｈ、被覆部９４ｇ，９４ｈの先端部が接着部分２３ｂより突出しているので、外装袋２の密封性が良好である。そして、外装袋２が不要に大きくなることが防止されている。 And in this Embodiment, the front-end | tip part of the coating | coated parts 84g and 84h of the sealant 84 protrudes from the adhesion part 23a, The coating | coated parts 64g and 64h of the sealants 64 and 94, and the front-end | tip part of the coating | coated parts 94g and 94h are adhesion parts 23b. Since it protrudes more, the sealing property of the exterior bag 2 is favorable. And it is prevented that the exterior bag 2 becomes unnecessarily large.
実施の形態２．
　本発明の実施の形態２に係る電池のセル１１においては、各電極ユニットのシーラントが一体化されていること以外は、実施の形態１に係るセル１と同様の構成を有する。 Embodiment 2. FIG.
The battery cell 11 according to Embodiment 2 of the present invention has the same configuration as that of the cell 1 according to Embodiment 1 except that the sealant of each electrode unit is integrated.
　図１０は、接着部２３を正面から見た状態を示す模式的断面図である。図１０においては、半体２１，半体２２と、各シーラントの各被覆部とが熱溶着により接着される前の状態を示している。
　本実施の形態に係る電極ユニット８の被覆部８４ｋは、上下に分かれずに一体化されており、正面視が等脚台形状をなしている。そして、各電極ユニット８の被覆部８４ｋの幅は、電極ユニット８の積層方向に対し、上から下へ漸次的に広くなっている。各被覆部８４ｋの斜面は繋がっている。 FIG. 10 is a schematic cross-sectional view showing a state in which the bonding portion 23 is viewed from the front. FIG. 10 shows a state before the half bodies 21 and 22 and the respective covering portions of the sealants are bonded by thermal welding.
The covering portion 84k of the electrode unit 8 according to the present embodiment is integrated without being divided into upper and lower parts, and the front view has an isosceles trapezoidal shape. The width of the covering portion 84k of each electrode unit 8 gradually increases from top to bottom with respect to the stacking direction of the electrode units 8. The slopes of the respective covering portions 84k are connected.
　電極ユニット６，９の被覆部６４ｋ，９４ｋも上下に分かれずに一体化されており、正面視が等脚台形状をなしている。そして、上側の電極ユニット６の被覆部６４ｋ、上側の電極ユニット９の被覆部９４ｋ、下側の電極ユニット９の被覆部９４ｋ、下側の電極ユニット６の被覆部６４ｋの幅は、電極ユニット６，９，９，６の積層方向に対し、上から下へ漸次的に広くなっている。被覆部６４ｋ，９４ｋ，６４ｋ，９４ｋの斜面は繋がっている。
　外装袋２の半体２１は、被覆部の側面の形状に対応して、即ち接着部分２３ａ，２３ｂが正面視で等脚台形状をなすように、即ち半体２１が凸部を有するように、例えばプレス絞り加工により形成されている。 The covering portions 64k and 94k of the electrode units 6 and 9 are also integrated without being divided into upper and lower parts, and the front view has an isosceles trapezoidal shape. The width of the covering portion 64k of the upper electrode unit 6, the covering portion 94k of the upper electrode unit 9, the covering portion 94k of the lower electrode unit 9, and the covering portion 64k of the lower electrode unit 6 are as follows. , 9, 9, and 6 gradually increase from top to bottom. The slopes of the covering portions 64k, 94k, 64k, and 94k are connected.
The half body 21 of the outer bag 2 corresponds to the shape of the side surface of the covering portion, that is, the adhesive portions 23a and 23b have an isosceles trapezoidal shape in front view, that is, the half body 21 has a convex portion. For example, it is formed by press drawing.
　本実施の形態の場合、実施の形態１と同様に電極ユニット８の各被覆部８４ｋの幅が上から下へ漸次的に広くなり、電極ユニット６，９，９，６の被覆部６４ｋ，９４ｋ，６４ｋ，９４ｋの幅が上から下へ漸次的に広くなり、接着部分２３ａ，２３ｂはこの積層形状に対応して等脚台形状をなすので、接着部分２３ａ，２３ｂの各根元部分と、半体２２とのなす角度は鋭角になっている。
　従って、半体２１，２２の外側にヒータを配し、プレスした場合に、接着部分２３ａ，２３ｂの側面及び根元部分においても熱及びプレス圧が良好にかかることになる。このとき、被覆部８４ｋの斜面と接着部分２３ａの台形の斜辺部分とが当接し、被覆部６４ｋ，９４ｋ，９４ｋ，６４ｋの斜面と接着部分２３ｂの台形の斜辺部分とが当接しており、接着部分２３ａ，２３ｂの合成樹脂層と各被覆部とが容易に良好に融着し、接着部分２３ａ，２３ｂの側面及び根元部分を各シーラント及び半体２２に密着させることができ、外装袋２を良好に密閉することができる。
　なお、被覆部６４ｋ，８４ｋ，９４ｋは一体化されている場合に限定されるものではなく、上下に分かれているものであってもよい。 In the case of the present embodiment, as in the first embodiment, the width of each covering portion 84k of the electrode unit 8 gradually increases from the top to the bottom, and the covering portions 64k, 94k of the electrode units 6, 9, 9, 6 are provided. , 64k, and 94k are gradually widened from top to bottom, and the bonding portions 23a and 23b form an isosceles trapezoidal shape corresponding to this laminated shape. The angle formed with the body 22 is an acute angle.
Therefore, when a heater is disposed on the outside of the half bodies 21 and 22 and pressed, heat and press pressure are favorably applied to the side surfaces and the root portions of the bonded portions 23a and 23b. At this time, the slope of the covering portion 84k is in contact with the trapezoidal oblique side portion of the bonding portion 23a, and the slope of the covering portion 64k, 94k, 94k, 64k is in contact with the trapezoidal oblique side portion of the bonding portion 23b. The synthetic resin layers of the portions 23a and 23b and the respective covering portions are easily and satisfactorily fused, and the side surfaces and the root portions of the bonding portions 23a and 23b can be brought into close contact with the respective sealants and the half body 22, so that the outer bag 2 It can be sealed well.
In addition, the coating | coated parts 64k, 84k, 94k are not limited to the case where they are integrated, You may divide into the upper and lower sides.
実施の形態３．
　本発明の実施の形態３に係る電池のセル１２においては、外装袋２の接着部分２３ａ及び接着部分２３ｂ内で、タブが負極端子４及び正極端子３と接続されていること以外は、実施の形態１に係るセル１と同様の構成を有する。
　図１１は、本発明の実施の形態３に係る電池のセル１２の負極のタブ８２ａと負極端子４との接続部分を示す模式的断面図、図１２は接着部２３を正面から見た状態を示す模式的断面図である。図１２においては、半体２１，半体２２と、各シーラントの各被覆部とが熱溶着により接着される前の状態を示している。 Embodiment 3 FIG.
In the battery cell 12 according to Embodiment 3 of the present invention, except that the tab is connected to the negative electrode terminal 4 and the positive electrode terminal 3 in the adhesive portion 23a and the adhesive portion 23b of the outer bag 2, the embodiment is implemented. The configuration is the same as that of the cell 1 according to the first embodiment.
FIG. 11 is a schematic cross-sectional view showing a connection portion between the negative electrode tab 82a and the negative electrode terminal 4 of the battery cell 12 according to the third embodiment of the present invention, and FIG. 12 shows a state where the adhesive portion 23 is viewed from the front. It is a typical sectional view shown. FIG. 12 shows a state before the half bodies 21 and 22 and the respective coating portions of the respective sealants are bonded by thermal welding.
　図１１に示すように、実施の形態３に係るセル１２の接着部２３は、タブ８２ａが延びる方向に突出した接着部分（請求項５の突出部）２３ａを有する。即ち、セル１２の接着部分２３ａの突出長は、実施の形態１に係るセル１の接着部分２３ａの突出長より長くなっている。
　接着部分２３ａの基端部で、被覆部８４ｇ，８４ｈに覆われた３本のタブ８２ａが挟まれた状態で熱溶着が施され、被覆部８４ｇ，８４ｈが該基端部に接着されている。各電極ユニット８の被覆部８４ｇ，８４ｈの幅は、電極ユニット８の積層方向に対し、上から下へ漸次的に広くなっている。接着部分２３ａの基端部は、正面視が等脚台形状をなしている。
　接着部分２３ａ内で、接着部分２３ａが延びる方向に、タブ８２ａは被覆部８４ｇ，８４ｈから突出し、上側及び下側のタブ８２ａは折れ曲がって、中央側のタブ８２ａに重ね合わされている。重ね合わされた３本のタブ８２ａは、溶接により負極端子４に接続されている。負極端子４の中央側から端側の部分はシーラント４１，４２により覆われている。シーラント４１，４２は接着部分２３ａの先端部に挟まれている。 As shown in FIG. 11, the adhesion part 23 of the cell 12 according to the third embodiment has an adhesion part (protrusion part of claim 5) 23a protruding in a direction in which the tab 82a extends. That is, the protruding length of the adhesive portion 23a of the cell 12 is longer than the protruding length of the adhesive portion 23a of the cell 1 according to the first embodiment.
At the base end portion of the bonding portion 23a, heat welding is performed in a state where the three tabs 82a covered with the covering portions 84g and 84h are sandwiched, and the covering portions 84g and 84h are bonded to the base end portion. . The width of the covering portions 84g and 84h of each electrode unit 8 gradually increases from top to bottom with respect to the stacking direction of the electrode units 8. The base end portion of the bonding portion 23a has an isosceles trapezoidal shape when viewed from the front.
In the bonding portion 23a, the tab 82a protrudes from the covering portions 84g and 84h in the direction in which the bonding portion 23a extends, and the upper and lower tabs 82a are bent and overlapped with the central tab 82a. The three superimposed tabs 82a are connected to the negative electrode terminal 4 by welding. Portions from the center side to the end side of the negative electrode terminal 4 are covered with sealants 41 and 42. The sealants 41 and 42 are sandwiched between the tips of the bonding portions 23a.
　接着部分２３ｂの突出長はセル１の接着部分２３ｂの突出長より長くなっており（不図示）、接着部分２３ｂの基端部においても、被覆部６４ｇ，６４ｈに覆われた２本のタブ６２ａ、及び被覆部９４ｇ，９４ｈに覆われた２本のタブ９２ａが挟まれた状態で、熱溶着が施されている。上側の電極ユニット６の被覆部６４ｇ，６４ｈ、上側の電極ユニット９の被覆部９４ｇ，９４ｈ、下側の電極ユニット９の被覆部９４ｇ，９４ｈ、下側の電極ユニット６の被覆部６４ｇ，６４ｈの幅は、電極ユニット６，９，９，６の積層方向に対し、上から下へ漸次的に広くなっている。接着部分２３ｂの基端部は、正面視が等脚台形状をなしている。
　そして、接着部分２３ｂ内でタブ６２ａ，９２ａ，９２ａ、６２ａが重ね合わされ、溶接により正極端子３と接続されている。正極端子３の中央側から端側の部分はシーラント３１，３２により覆われている（図１２参照）。シーラント３１，３２は接着部分２３ｂの先端部に挟まれている。 The protruding length of the bonding portion 23b is longer than the protruding length of the bonding portion 23b of the cell 1 (not shown), and the two tabs 62a covered with the covering portions 64g and 64h are also formed at the base end portion of the bonding portion 23b. In addition, thermal welding is performed in a state where the two tabs 92a covered with the covering portions 94g and 94h are sandwiched. Covering portions 64g and 64h of the upper electrode unit 6, covering portions 94g and 94h of the upper electrode unit 9, covering portions 94g and 94h of the lower electrode unit 9, and covering portions 64g and 64h of the lower electrode unit 6 The width gradually increases from top to bottom with respect to the stacking direction of the electrode units 6, 9, 9, 6. The base end portion of the bonding portion 23b has an isosceles trapezoidal shape when viewed from the front.
And tab 62a, 92a, 92a, 62a is piled up in the adhesion part 23b, and it connects with the positive electrode terminal 3 by welding. Portions from the center side to the end side of the positive electrode terminal 3 are covered with sealants 31 and 32 (see FIG. 12). The sealants 31 and 32 are sandwiched between the tip portions of the bonding portion 23b.
　図１２に示すように、下側のシーラント４２の幅は上側のシーラント４１の幅より広く、下側のシーラント３２の幅は上側のシーラント３１の幅より広い。
　外装袋２の半体２１は、上述のシーラントの段形状に対応して、接着部分２３ａ，２３ｂが正面視で等脚台形状をなすように、即ち半体２１が凸部を有するように、例えばプレス絞り加工により形成されている。 As shown in FIG. 12, the width of the lower sealant 42 is wider than the width of the upper sealant 41, and the width of the lower sealant 32 is wider than the width of the upper sealant 31.
The half body 21 of the outer bag 2 corresponds to the above-described step shape of the sealant so that the adhesive portions 23a and 23b have an isosceles trapezoidal shape in front view, that is, the half body 21 has a convex portion. For example, it is formed by press drawing.
　本実施の形態においては、電極ユニット８の各被覆部の幅が上から下へ漸次的に広くなり、電極ユニット６，９，９，６の各被覆部の幅が上から下へ漸次的に広くなり、接着部分２３ａ，２３ｂの基端部はこの積層形状に対応して等脚台形状をなすので、接着部分２３ａ，２３ｂの根元部分と、半体２２とのなす角度は鋭角になっている。 In the present embodiment, the width of each covering portion of the electrode unit 8 gradually increases from the top to the bottom, and the width of each covering portion of the electrode units 6, 9, 9, 6 gradually increases from the top to the bottom. Since the base end portions of the bonding portions 23a and 23b form an isosceles trapezoidal shape corresponding to this laminated shape, the angle formed between the base portions of the bonding portions 23a and 23b and the half body 22 becomes an acute angle. Yes.
　図１３は、半体２１，半体２２と、各シーラントとが熱溶着により接着された状態を示す模式的断面図である。
　半体２１，２２の外側にヒータを配し、プレスした場合に、接着部分２３ａ，２３ｂの根元部分においても熱及びプレス圧が良好にかかることになり、接着部分２３ａ，２３ｂの合成樹脂層と各被覆部とが容易に融着し、接着部分２３ａ，２３ｂの基端部の根元部分を半体２２に密着している。 FIG. 13 is a schematic cross-sectional view showing a state in which the half body 21, the half body 22 and each sealant are bonded by thermal welding.
When a heater is arranged outside the half bodies 21 and 22 and pressed, heat and press pressure are applied well even at the root portions of the bonded portions 23a and 23b, and the synthetic resin layer of the bonded portions 23a and 23b Each covering portion is easily fused, and the base portions of the base end portions of the bonding portions 23 a and 23 b are in close contact with the half body 22.
　そして、下側のシーラント４２の幅が上側のシーラント４１の幅より広く、下側のシーラント３２の幅が上側のシーラント３１の幅より広く、接着部分２３ａ，２３ｂの先端部はこの積層形状に対応して等脚台形状をなすので、接着部分２３ａ，２３ｂの先端部の根元部分と、半体２２とのなす角度は鋭角になっている。
　従って、半体２１，２２の外側にヒータを配し、プレスした場合に、接着部分２３ａ，２３ｂの先端部の側面及び根元部分においても熱及びプレス圧が良好にかかることになり、接着部分２３ａ，２３ｂの合成樹脂層と各被覆部とが容易に融着し、接着部分２３ａ，２３ｂの先端部の側面及び根元部分を、各シーラント及び半体２２に密着させることができ、外装袋２を良好に密閉することができる。 And the width | variety of the lower sealant 42 is wider than the width | variety of the upper sealant 41, the width | variety of the lower sealant 32 is wider than the width | variety of the upper sealant 31, and the front-end | tip part of adhesion part 23a, 23b respond | corresponds to this lamination | stacking shape. As a result, it forms an isosceles trapezoidal shape, so that the angle formed between the base portion of the tip end portion of the bonding portions 23a and 23b and the half body 22 is an acute angle.
Therefore, when a heater is disposed outside the half bodies 21 and 22 and pressed, heat and pressing pressure are favorably applied to the side surfaces and root portions of the tip portions of the bonding portions 23a and 23b. , 23b and the covering portions are easily fused, and the side surfaces and root portions of the tip portions of the adhesive portions 23a, 23b can be brought into close contact with the sealants and the half body 22, and the outer bag 2 can be It can be sealed well.
　シーラント３１，３２，４１，４２は厚みを厚くすることで、加熱及び加圧時に、シーラント３１，３２と接着部分２３ｂの先端部とを、及びシーラント４１，４２と接着部分２３ａの先端部とを良好に融着させることができる。そして、接着部分２３ａ，２３ｂの金属層と正極端子３又は負極端子４とがショートするのを防止することができる。 By increasing the thickness of the sealants 31, 32, 41, 42, the sealants 31, 32 and the tip of the adhesive portion 23b and the sealants 41, 42 and the tip of the adhesive portion 23a are heated and pressurized. It can be fused well. And it can prevent that the metal layer of adhesion part 23a, 23b and the positive electrode terminal 3 or the negative electrode terminal 4 short-circuit.
　本実施の形態においては、タブ８２ａが接着部分２３ａ内で負極端子４と接続され、タブ６２ａ，９２ａが接着部分２３ａ内で正極端子３と接続されているので、安全性がより良好である。 In the present embodiment, since the tab 82a is connected to the negative electrode terminal 4 in the adhesive portion 23a and the tabs 62a and 92a are connected to the positive electrode terminal 3 in the adhesive portion 23a, the safety is better.
実施の形態４．
　図１４は、本発明の実施の形態４に係る電池のセル１３を示す模式的断面図であり、図１５は接着部分２３ａを正面から見た状態を示す模式的断面図である。図１５においては、半体２１，半体２２と、被覆部８４ｇ、８４ｈとが熱溶着により接着される前の状態を示している。図１５中、図２～図４と同一部分は同一符号を付して詳細な説明を省略する。
　セル１３は、外装袋２と、外装袋２の周縁部の一部から突出した正極端子３（不図示）及び負極端子４と、２つの正極の電極ユニット５と、１つの負極の電極ユニット８とを備える。このセル１３単体で、又はセル１と他のセルとを組み合わせてケース（不図示）に収容することにより電池が構成される。 Embodiment 4 FIG.
FIG. 14 is a schematic cross-sectional view showing a cell 13 of a battery according to Embodiment 4 of the present invention, and FIG. 15 is a schematic cross-sectional view showing a state where an adhesive portion 23a is viewed from the front. FIG. 15 shows a state before the half bodies 21 and 22 and the covering portions 84g and 84h are bonded together by heat welding. 15, the same parts as those in FIGS. 2 to 4 are denoted by the same reference numerals, and detailed description thereof will be omitted.
The cell 13 includes an exterior bag 2, a positive terminal 3 (not shown) and a negative terminal 4 protruding from a part of the peripheral edge of the exterior bag 2, two positive electrode units 5, and one negative electrode unit 8. With. A battery is configured by accommodating the cell 13 alone or a combination of the cell 1 and another cell in a case (not shown).
　電極ユニット８は実施の形態１に係る電極ユニット８と同様の構成を有する。
　電極ユニット５は、電極５０、導電体５２、保護層５３、及びシーラント５４を備える。導電体５２は角型平板状をなし、半体２１又は半体２２の内面に配されており、導電体５２の内面は保護層５３により覆われている。保護層５３の内面の周縁部の内側には、活物質及び電解液を有する角型平板状の電極５０が設けられている。シーラント５４は額縁状をなし、前記周縁部、及び半体２１又は半体２２に接着され、半体２１又は半体２２と被覆部５２とにより導電体５２を封止する。
　シーラント５４は角筒状の枠本体の一端部に、内側に張り出した内側縁部５４ａを備え、枠本体の他端部に、外側に張り出した外側縁部５４ｂを備える。即ち、シーラント５４は平面視で、内側縁部５４ａ（電極５０の外側部分）の外側に、外側縁部５４ｂが位置するように構成されている。
　電極ユニット５の電極５０、導電体５２、保護層５３、及びシーラント５４は、実施の形態１に係る電極ユニット６の電極６０、導電体６２、保護層６３、及びシーラント６４と同様の材料を用いてなる。 The electrode unit 8 has the same configuration as the electrode unit 8 according to the first embodiment.
The electrode unit 5 includes an electrode 50, a conductor 52, a protective layer 53, and a sealant 54. The conductor 52 has a rectangular flat plate shape, and is disposed on the inner surface of the half body 21 or the half body 22. The inner surface of the conductor 52 is covered with a protective layer 53. On the inner side of the peripheral edge of the inner surface of the protective layer 53, a square plate-like electrode 50 having an active material and an electrolytic solution is provided. The sealant 54 has a frame shape, is bonded to the peripheral edge portion, and the half body 21 or the half body 22, and seals the conductor 52 by the half body 21 or the half body 22 and the covering portion 52.
The sealant 54 includes an inner edge portion 54a projecting inwardly at one end portion of the rectangular tube-shaped frame body, and an outer edge portion 54b projecting outwardly at the other end portion of the frame body. That is, the sealant 54 is configured such that the outer edge portion 54b is positioned outside the inner edge portion 54a (the outer portion of the electrode 50) in plan view.
The electrode 50, the conductor 52, the protective layer 53, and the sealant 54 of the electrode unit 5 are made of the same material as the electrode 60, the conductor 62, the protective layer 63, and the sealant 64 of the electrode unit 6 according to Embodiment 1. It becomes.
　電極ユニット８のシーラント８４の外側縁部８４ｄ，８４ｆには、タブ８２ａが突出している部分において被覆部８４ｇ，８４ｈが連設されており、各被覆部８４ｇ，８４ｈはタブ８２ａを覆った状態で、接着部分２３ａの外側に引き出されている。即ち被覆部８４ｇ，８４ｈの先端部は、接着部分２３ａの先端部から所定長、突出している。被覆部８４ｇと８４ｈとは互いに合わせた状態で接着されている。 The outer edge portions 84d and 84f of the sealant 84 of the electrode unit 8 are continuously provided with covering portions 84g and 84h at the portion where the tab 82a protrudes, and the covering portions 84g and 84h cover the tab 82a. , Pulled out to the outside of the bonding portion 23a. That is, the tip portions of the covering portions 84g and 84h protrude from the tip portion of the bonding portion 23a by a predetermined length. The covering portions 84g and 84h are bonded in a state of being combined with each other.
　図１５に示すように、下側の被覆部８４ｈの幅は上側の被覆部８４ｇの幅より広い。
　そして、接着部分２３ａは、上述の被覆部８４ｇ、８４ｈの段形状に対応して、即ち，正面視で等脚台形状をなすように、即ち半体２１が凸部を有するように、例えばプレス絞り加工により形成されている。
　従って、半体２１，２２の外側にヒータを配し、プレスした場合に、接着部分２３ａの側面及び根元部分においても、熱及びプレス圧が良好にかかることになり、接着部分２３ａの合成樹脂層と被覆部８４ｇ，８４ｈとが容易に融着し、接着部分２３ａの側面及び根元部分を、被覆部８４ｇ，８４ｈ及び半体２２に密着させることができる。
　被覆部８４ｇ，８４ｈは厚みを厚くすることで、加熱及び加圧時に、被覆部８４ｇ，８４ｈと接着部分２３ａとを良好に融着させることができる。そして、接着部分２３ａの金属層とタブ８２ａとがショートするのを防止することができる。 As shown in FIG. 15, the width of the lower covering portion 84h is wider than the width of the upper covering portion 84g.
The adhesive portion 23a corresponds to the step shape of the covering portions 84g and 84h described above, that is, has an isosceles trapezoidal shape when viewed from the front, that is, the half body 21 has a convex portion, for example, press It is formed by drawing.
Therefore, when a heater is disposed outside the half bodies 21 and 22 and pressed, heat and press pressure are applied well at the side surface and the root portion of the bonded portion 23a, and the synthetic resin layer of the bonded portion 23a. And the covering portions 84g and 84h can be easily fused, and the side surface and the root portion of the bonding portion 23a can be brought into close contact with the covering portions 84g and 84h and the half body 22.
By increasing the thickness of the covering portions 84g and 84h, the covering portions 84g and 84h and the bonding portion 23a can be favorably fused during heating and pressurization. And it can prevent that the metal layer of the adhesion part 23a and the tab 82a short-circuit.
　以上のように、本発明に係る電池は、酸性又はアルカリ性の電解液を含有する電極、及び矩形板状のタブを各々有し、積層された複数の電極ユニットと、前記複数の電極ユニットを覆い、外周縁部を重ねて接着した接着部を有する被覆体と、前記タブを被覆し、前記接着部に挟まれた状態で接着されているシーラントとを備え、前記シーラントは、幅が、前記電極ユニットの積層方向に対し、漸次的に広くなるように構成されていることを特徴とする。 As described above, the battery according to the present invention has an electrode containing an acidic or alkaline electrolyte and a rectangular plate-like tab, and covers a plurality of stacked electrode units and the plurality of electrode units. A covering body having an adhesive portion that is bonded by overlapping an outer peripheral edge portion, and a sealant that covers the tab and is bonded in a state of being sandwiched between the adhesive portions, the sealant having a width that is the electrode It is characterized by being configured to gradually widen in the stacking direction of the units.
　本発明においては、タブはシーラントに覆われているので、電池内で電解液に係る酸性又はアルカリ性の物質により腐食されることが防止されている。従って、タブを正極又は負極の端子と良好に接続することができるとともに、電池性能（充放電性能）の低下が抑制されている。 In the present invention, since the tab is covered with the sealant, it is prevented from being corroded by an acidic or alkaline substance related to the electrolytic solution in the battery. Therefore, the tab can be satisfactorily connected to the positive electrode or negative electrode terminal, and a decrease in battery performance (charge / discharge performance) is suppressed.
　シーラントが接着部に挟まれた状態で接着されるように構成されているので、例えば熱溶着等によりシーラントが容易に接着部に接着されることができ、タブが接着部に密閉された状態で固定される。
　本発明においては、積層された電極ユニットのシーラントの幅が、電極ユニットの積層方向に対して漸次的に広くなるように構成され、積層された電極ユニットの側部が階段状又は斜面状をなし、該側部に対向する接着部の面が斜めになるので、例えば接着部に加熱及び加圧を行って接着するときに、前記側部、及び下層の電極ユニット側の部分、即ち接着部の根元部分にも熱及びプレス圧が良好にかかり、接着部とシーラントとの密着性が良好である。 Since the sealant is configured to be bonded in a state of being sandwiched between the bonded portions, the sealant can be easily bonded to the bonded portion by, for example, heat welding, and the tab is sealed in the bonded portion. Fixed.
In the present invention, the width of the sealant of the stacked electrode units is configured to gradually increase with respect to the stacking direction of the electrode units, and the side portions of the stacked electrode units have a stepped shape or a slope shape. Since the surface of the bonding portion facing the side portion is slanted, for example, when the bonding portion is bonded by heating and pressing, the side portion and the lower electrode unit side portion, that is, the bonding portion Heat and press pressure are also applied to the root portion, and the adhesion between the bonded portion and the sealant is good.
　本発明に係る電池は、上述の電池において、前記シーラントの幅は、電極ユニット間で異なることを特徴とする。 The battery according to the present invention is characterized in that, in the above-described battery, the width of the sealant is different between electrode units.
　本発明においては、簡単な構成で、階段状の前記側部を得ることができる。 In the present invention, the stepped side portion can be obtained with a simple configuration.
　本発明に係る電池は、上述のいずれかの電池において、前記接着部は、前記電極ユニットの積層形状に対応し、正面視が台形状をなす凸部を有することを特徴とする。 The battery according to the present invention is characterized in that, in any one of the batteries described above, the adhesive portion has a convex portion corresponding to the stacked shape of the electrode unit and having a trapezoidal shape in front view.
　本発明においては、接着部の形状が前記電極ユニットの側部に対応しており、接着部の斜め上側から接着部の側面及び前記側部に向けて、熱及び圧力をかけることができるので、接着部とシーラントとが良好に溶融して密着することができ、被覆体がより良好に密閉される。 In the present invention, the shape of the bonding portion corresponds to the side portion of the electrode unit, and heat and pressure can be applied from the diagonally upper side of the bonding portion toward the side surface of the bonding portion and the side portion. The bonded portion and the sealant can be melted and adhered to each other, and the coated body is sealed better.
　本発明に係る電池は、上述のいずれかの電池において、複数の前記タブが、前記シーラントが接着された部分から引き出され、重ね合わされた状態で接続された端子を備えることを特徴とする。 The battery according to the present invention is characterized in that, in any one of the batteries described above, the plurality of tabs are provided with terminals that are pulled out from a portion where the sealant is bonded and connected in a superposed state.
　本発明においては、タブがシーラントにより覆われ、腐食することが防止されており、シーラントが接着された部分から突出したタブは重ね合わされて、電極ユニットを収容した被覆体本体の外部で正極又は負極の端子と良好に接続することができる。従って、接続の信頼性が向上するとともに、被覆体本体を小型化することができる。 In the present invention, the tab is covered with the sealant and prevented from corroding, and the tabs protruding from the portion to which the sealant is bonded are overlapped, and the positive electrode or the negative electrode outside the covering body containing the electrode unit. The terminal can be connected well. Therefore, the reliability of the connection is improved and the cover body can be downsized.
　本発明に係る電池は、上述の電池において、前記接着部は、前記タブが延びる方向に突出した突出部を有し、該突出部の内部で、複数の前記タブが前記端子と接続されていることを特徴とする。 In the battery according to the present invention, in the battery described above, the adhesive portion has a protruding portion protruding in a direction in which the tab extends, and a plurality of the tabs are connected to the terminals inside the protruding portion. It is characterized by that.
　本発明においては、突出部内で、タブが端子と接続されているので、安全性がより良好である。 In the present invention, since the tab is connected to the terminal in the protruding portion, the safety is better.
　本発明に係る電池は、上述の電池において、前記端子を被覆し、前記突出部の先端部に挟まれた状態で接着されている第２のシーラントを備え、該第２のシーラントは、幅が異なる２枚の半体からなることを特徴とする。 The battery according to the present invention includes a second sealant that covers the terminal and is bonded in a state of being sandwiched between the leading ends of the protrusions in the battery described above, and the second sealant has a width. It consists of two different halves.
　本発明においては、例えば熱溶着により、第２のシーラントを突出部の先端部に密着させることができ、端子を突出部の先端部に固定することができる。
　端子を被覆する第２のシーラントは幅が異なる半体を積層してなり、側部が階段状をなし、該側部に対向する突出部の面が斜めになるので、例えば突出部に加熱及び加圧を行って接着するときに、前記側部、及び突出部の根元部分にも熱及びプレス圧が良好にかかり、突出部と第２のシーラントとの密着性が良好である。そして、各半体の厚みを厚くした場合、例えば加熱及び加圧時に、第２のシーラントと突出部の先端部とを良好に融着させることができるとともに、被覆体が合成樹脂層と金属層とを含有するラミネートシートからなるとき、該金属層と端子とがショートするのを防止することができる。 In the present invention, the second sealant can be brought into close contact with the distal end portion of the protruding portion by, for example, heat welding, and the terminal can be fixed to the distal end portion of the protruding portion.
The second sealant covering the terminal is formed by stacking halves with different widths, the side portion is stepped, and the surface of the protruding portion facing the side portion is slanted. When bonding is performed by applying pressure, heat and press pressure are also applied to the side portion and the base portion of the protruding portion, and the adhesion between the protruding portion and the second sealant is good. When the thickness of each half is increased, for example, the second sealant and the tip of the protruding portion can be favorably fused at the time of heating and pressurizing, and the covering is made of a synthetic resin layer and a metal layer. Can be prevented from short-circuiting with the metal layer.
　本発明に係る電池は、酸性又はアルカリ性の電解液を含有する電極、及び矩形板状のタブを有する電極ユニットと、該電極ユニットを覆い、外周縁部を重ね合わせて接着した接着部を有する被覆体と、前記タブを被覆し、前記接着部に挟まれた状態で接着されているシーラントとを備え、前記シーラントは、幅が異なる２枚の半体からなることを特徴とする。 The battery according to the present invention has an electrode containing an acidic or alkaline electrolyte and an electrode unit having a rectangular plate-like tab, and a covering having an adhesive portion that covers the electrode unit and is bonded by overlapping the outer periphery. And a sealant that covers the tab and is bonded in a state of being sandwiched between the bonding portions, and the sealant includes two halves having different widths.
　本発明においては、タブはシーラントに覆われているので、電池内で電解液に係る酸性又はアルカリ性の物質により腐食されることが防止されている。従って、タブを正極又は負極の端子と良好に接続することができるとともに、電池性能（充放電性能）の低下が抑制される。 In the present invention, since the tab is covered with the sealant, it is prevented from being corroded by an acidic or alkaline substance related to the electrolytic solution in the battery. Therefore, the tab can be satisfactorily connected to the positive electrode or negative electrode terminal, and a decrease in battery performance (charge / discharge performance) is suppressed.
　シーラントが接着部に挟まれた状態で接着されるように構成されているので、熱溶着等によりシーラントを容易に接着部に接着させることができ、タブが接着部に密閉された状態で固定される。タブを被覆するシーラントは幅が異なる半体を積層してなり、側部が階段状をなし、該側部に対向する接着部の面が斜めになるので、例えば接着部に加熱及び加圧を行って接着するときに、前記側部、及び接着部の根元部分にも熱及びプレス圧が良好にかかり、接着部とシーラントとの密着性が良好である。また、各半体の厚みを厚くすることで、例えば加熱及び加圧時に、シーラントと接着部とを良好に融着させることができるとともに、被覆体が合成樹脂層と金属層を含有するラミネートシートからなる場合、該金属層とタブとがショートするのを防止することができる。 Since the sealant is configured to be bonded in a state of being sandwiched between the bonded portions, the sealant can be easily bonded to the bonded portion by heat welding or the like, and the tab is fixed in a state of being sealed in the bonded portion. The The sealant covering the tab is formed by stacking halves with different widths, the side part is stepped, and the surface of the adhesive part facing the side part is slanted. For example, the adhesive part is heated and pressurized. When the bonding is performed, heat and press pressure are also applied to the side portion and the base portion of the bonding portion, and the adhesion between the bonding portion and the sealant is good. In addition, by increasing the thickness of each half body, for example, during heating and pressurization, the sealant and the adhesive portion can be fused well, and the laminate includes a synthetic resin layer and a metal layer. When it consists of, it can prevent that this metal layer and a tab short-circuit.
　本発明に係る電池は、上述のいずれかの電池において、前記接着部の先端部から前記シーラントの先端部が外部に突出していることを特徴とする。 The battery according to the present invention is characterized in that, in any one of the batteries described above, the tip of the sealant protrudes from the tip of the adhesive portion.
　本発明においては、シーラントの先端部が接着部より突出しているので、被覆体の密封性が良好になる。また、接着部をシーラントの端部より突出させて、不要に被覆体の体積が増加するという問題も生じない。 In the present invention, since the tip of the sealant protrudes from the bonded portion, the sealing performance of the covering is improved. Moreover, the problem that the volume of the covering increases unnecessarily by causing the adhesive portion to protrude from the end portion of the sealant does not occur.
　本発明に係る電池は、上述のいずれかの電池において、前記電極は、活物質としてバナジウムイオン又はバナジウムを含むイオンを含有することを特徴とする。 The battery according to the present invention is any one of the above batteries, wherein the electrode contains vanadium ions or ions containing vanadium as an active material.
　本発明においては、電極が活物質としてバナジウムイオン又はバナジウムを含むイオンを含有しており、酸性又はアルカリ性の電解液を含有する電池において、タブが腐食されることが防止され、正極又は負極の端子に良好に接続されることができる。 In the present invention, the electrode contains vanadium ions or ions containing vanadium as an active material, and in a battery containing an acidic or alkaline electrolyte, the tab is prevented from being corroded, and the positive or negative terminal Can be connected well.
　なお、本発明は上述した実施の形態１～４の内容に限定されるものではなく、請求項に示した範囲で種々の変更が可能である。すなわち、請求項に示した範囲で適宜変更した技術的手段を組み合わせて得られる実施形態も本発明の技術的範囲に含まれる。
　例えば、実施の形態１～４の電池は、バナジウム固体塩電池に限定されるものではない。即ち、活物質はバナジウムでなく、鉄又はクロムである構成でもよく、電解液は、酸性でなくアルカリ性とする構成であってもよい。
　そして、セルの各部材の材質、構成、及び個数、電極の極性、並びに外装袋２の接着方法等も実施の形態１～４において説明した場合に限定されるものではない。 The present invention is not limited to the contents of Embodiments 1 to 4 described above, and various modifications can be made within the scope of the claims. In other words, embodiments obtained by combining technical means appropriately modified within the scope of the claims are also included in the technical scope of the present invention.
For example, the batteries of Embodiments 1 to 4 are not limited to vanadium solid salt batteries. That is, the active material may be iron or chromium instead of vanadium, and the electrolytic solution may be alkaline instead of acidic.
The material, configuration, and number of each member of the cell, the polarity of the electrodes, the bonding method of the outer bag 2 and the like are not limited to those described in the first to fourth embodiments.
　１、１１、１２、１３　セル
　２　外装袋
　２１　半体
　２２　半体
　２３　接着部
　２３ａ、２３ｂ　接着部分
　３　正極端子
　４　負極端子
　５、６、８、９　電極ユニット
　５０、６０、６１、８０、８１、９０、９１　電極
　５２、６２、８２、９２　導電体
　６２ａ、８２ａ、９２ａ　タブ
　５３、６３、８３、９３　保護層
　５４、６４、８４、９４、３１、３２、４１、４２　シーラント
　６４ａ、６４ｂ、８４ａ、８４ｂ、９４ａ、９４ｂ　半体
　５４ａ、８４ｃ、８４ｅ　内側縁部
　５４ｂ、８４ｄ、８４ｆ　外側縁部
　６４ｇ、６４ｈ、８４ｇ、８４ｈ、９４ｇ、９４ｈ、６４ｋ、８４ｋ、９４ｋ　被覆部
　７　イオン交換膜
  1, 11, 12, 13 Cell 2 Exterior bag 21 Half body 22 Half body 23 Adhesion part 23a, 23b Adhesion part 3 Positive electrode terminal 4 Negative electrode terminal 5, 6, 8, 9 Electrode unit 50, 60, 61, 80, 81, 90, 91 Electrode 52, 62, 82, 92 Conductor 62a, 82a, 92a Tab 53, 63, 83, 93 Protective layer 54, 64, 84, 94, 31, 32, 41, 42 Sealant 64a, 64b, 84a, 84b, 94a, 94b Half 54a, 84c, 84e Inner edge 54b, 84d, 84f Outer edge 64g, 64h, 84g, 84h, 94g, 94h, 64k, 84k, 94k Cover 7 Ion exchange membrane

Claims (9)

  1. 　酸性又はアルカリ性の電解液を含有する電極、及び矩形板状のタブを各々有し、積層された複数の電極ユニットと、
    　前記複数の電極ユニットを覆い、外周縁部を重ねて接着した接着部を有する被覆体と、
    　前記タブを被覆し、前記接着部に挟まれた状態で接着されているシーラントと
    　を備え、
    　前記シーラントは、幅が、前記電極ユニットの積層方向に対し、漸次的に広くなるように構成されていることを特徴とする電池。     A plurality of electrode units each having an electrode containing an acidic or alkaline electrolyte and a rectangular plate-like tab, and stacked;
    A covering body that covers the plurality of electrode units and has an adhesive portion that is bonded by overlapping the outer peripheral edge portion;
    A sealant covering the tab and adhered in a state sandwiched between the adhesive portions,
    The battery according to claim 1, wherein the sealant is configured such that a width gradually increases with respect to a stacking direction of the electrode units.
  2. 　前記シーラントの幅は、電極ユニット間で異なることを特徴とする請求項１に記載の電池。 The battery according to claim 1, wherein the width of the sealant is different between electrode units.
  3. 　前記接着部は、前記電極ユニットの積層形状に対応し、正面視が台形状をなす凸部を有することを特徴とする請求項１又は２に記載の電池。 The battery according to claim 1, wherein the adhesive portion has a convex portion corresponding to a stacked shape of the electrode unit and having a trapezoidal shape when viewed from the front.
  4. 　複数の前記タブが、前記シーラントが接着されている部分から引き出され、重ね合わされた状態で接続された端子を備えることを特徴とする請求項１から３までのいずれか１項に記載の電池。 The battery according to any one of claims 1 to 3, wherein the plurality of tabs are provided with terminals that are pulled out from a portion where the sealant is bonded and connected in an overlapped state.
  5. 　前記接着部は、前記タブが延びる方向に突出した突出部を有し、
    　該突出部の内部で、複数の前記タブが前記端子と接続されていることを特徴とする請求項４に記載の電池。     The adhesive portion has a protruding portion protruding in a direction in which the tab extends,
    The battery according to claim 4, wherein a plurality of the tabs are connected to the terminals inside the protruding portion.
  6. 　前記端子を被覆し、前記突出部の先端部に挟まれた状態で接着されている第２のシーラントを備え、
    　該第２のシーラントは、幅が異なる２枚の半体からなることを特徴とする請求項５に記載の電池。     A second sealant that covers the terminal and is bonded in a state of being sandwiched between tip portions of the protrusions;
    6. The battery according to claim 5, wherein the second sealant includes two halves having different widths.
  7. 　酸性又はアルカリ性の電解液を含有する電極、及び矩形板状のタブを有する電極ユニットと、
    　該電極ユニットを覆い、外周縁部を重ね合わせて接着した接着部を有する被覆体と、
    　前記タブを被覆し、前記接着部に挟まれた状態で接着されているシーラントと
    　を備え、
    　前記シーラントは、幅が異なる２枚の半体からなることを特徴とする電池。     An electrode containing an acidic or alkaline electrolyte, and an electrode unit having a rectangular plate-shaped tab;
    Covering the electrode unit, and a covering body having an adhesive portion bonded by overlapping the outer peripheral edge portion;
    A sealant covering the tab and adhered in a state sandwiched between the adhesive portions,
    The battery is characterized in that the sealant comprises two halves having different widths.
  8. 　前記接着部の先端部から前記シーラントの先端部が外部に突出していることを特徴とする請求項１から７までのいずれか１項に記載の電池。 The battery according to any one of claims 1 to 7, wherein a tip portion of the sealant protrudes from a tip portion of the adhesive portion.
  9. 　前記電極は、活物質としてバナジウムイオン又はバナジウムを含むイオンを含有することを特徴とする請求項１から８までのいずれか１項に記載の電池。
          The battery according to any one of claims 1 to 8, wherein the electrode contains vanadium ions or ions containing vanadium as an active material.
PCT/JP2016/067363 2015-06-15 2016-06-10 Battery WO2016204088A1 (en)

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