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WO2018101224A1 - Électrode bipolaire pour accumulateur au nickel-hydrogène et accumulateur au nickel-hydrogène - Google Patents

Électrode bipolaire pour accumulateur au nickel-hydrogène et accumulateur au nickel-hydrogène Download PDF

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Publication number
WO2018101224A1
WO2018101224A1 PCT/JP2017/042483 JP2017042483W WO2018101224A1 WO 2018101224 A1 WO2018101224 A1 WO 2018101224A1 JP 2017042483 W JP2017042483 W JP 2017042483W WO 2018101224 A1 WO2018101224 A1 WO 2018101224A1
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WIPO (PCT)
Prior art keywords
active material
material layer
density region
nickel
storage battery
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2017/042483
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English (en)
Japanese (ja)
Inventor
杉本祐樹
南形厚志
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Toyota Industries Corp
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Toyota Industries Corp
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
Priority claimed from JP2017217521A external-priority patent/JP6870582B2/ja
Application filed by Toyota Industries Corp filed Critical Toyota Industries Corp
Priority to DE112017006067.2T priority Critical patent/DE112017006067B4/de
Priority to CN201780073897.2A priority patent/CN110024205B/zh
Priority to US16/462,762 priority patent/US10693175B2/en
Publication of WO2018101224A1 publication Critical patent/WO2018101224A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/24—Alkaline accumulators
    • H01M10/30—Nickel accumulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/24—Electrodes for alkaline accumulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/24—Electrodes for alkaline accumulators
    • H01M4/32—Nickel oxide or hydroxide electrodes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present invention relates to a bipolar electrode for a nickel hydride storage battery and a nickel hydride storage battery.
  • a bipolar electrode having a metal foil, a positive electrode active material layer applied to one surface of the metal foil, and a negative electrode active material layer applied to the other surface may be used.
  • the positive electrode active material layer contains nickel hydroxide (Ni (OH) 2 ) as a positive electrode active material.
  • the negative electrode active material layer contains a hydrogen storage alloy as a negative electrode active material.
  • a positive electrode active material layer and a negative electrode active material layer are applied to a metal foil, and then the active material layer is pressed and adhered to the metal foil, whereby the active material layer is peeled off or removed from the metal foil. Suppression and improvement of charge / discharge performance. For example, in a bipolar electrode used for a lithium ion secondary battery, the entire surface of the bipolar electrode is pressed (Patent Document 1).
  • a nickel metal hydride battery generates oxygen gas from the positive electrode during overcharge.
  • This oxygen gas is usually absorbed by the negative electrode active material layer, and then reacted with hydrogen in a negative electrode active material provided in advance as a charge reserve, and returned to water.
  • the porosity of the negative electrode active material layer is small, oxygen gas generated from the positive electrode is less likely to enter the negative electrode active material layer, so that oxygen gas may accumulate in the battery.
  • the safety valve may be activated in some cases. As a result, the balance between the charge reserve and the discharge reserve is lost, and the battery may be deteriorated.
  • the porosity of the negative electrode active material layer is simply increased in order to avoid such a problem, the negative electrode active material layer is likely to be peeled off or detached from the metal foil, or the charge / discharge performance is degraded. There is.
  • the present invention has been made in view of such a background, and has bipolar battery for nickel metal hydride storage battery that has excellent charge / discharge performance and suppresses peeling and dropping of the active material layer from the metal foil and increase in the internal pressure of the battery. It is an object of the present invention to provide an electrode and a nickel-metal hydride storage battery including this bipolar electrode.
  • One embodiment of the present invention is provided on a metal foil, a first active material layer provided on a front side surface of the metal foil, and a back side surface of the metal foil, and has an area larger than that of the first active material layer.
  • a wide second active material layer, and the second active material layer includes a low density region disposed at a peripheral edge in a plan view when viewed from the thickness direction of the metal foil, and an inner side of the low density region.
  • the bipolar electrode for nickel-metal hydride storage battery has a high density region that is disposed and has a lower porosity than the low density region.
  • the nickel-metal hydride storage battery bipolar electrode (hereinafter simply referred to as “bipolar electrode”) is formed on a metal foil as a current collector and a second active material layer having a larger area than the first active material layer. And an active material layer. And a 2nd active material layer is arrange
  • the bipolar electrode does not simply increase the porosity of the second active material layer, but provides a low-density region at a specific position on the peripheral edge of the second active material layer. Thereby, the bipolar electrode has excellent charge / discharge performance. Further, according to the bipolar electrode, the active material layer does not peel off from the metal foil, and does not fall off. Furthermore, according to the bipolar electrode, an increase in the internal pressure of the battery is suppressed.
  • the amount of the electrolytic solution retained in the low density region is increased.
  • the electrolyte consumed as a gas during overcharge is replenished from the low density region to the high density region, so that current concentrates on the portion where the electrolyte remains due to local disappearance of the electrolyte. Is alleviated.
  • the life characteristics of the nickel metal hydride storage battery are improved.
  • the second active material layer has sufficient adhesion to the back side surface of the metal foil in a high density region having a relatively small porosity. As a result, the second active material layer does not peel from the metal foil and does not fall off. Moreover, charging / discharging efficiency becomes high by making the porosity of a high-density area
  • the second active material layer is provided with two regions having different porosity, that is, a high density region having a relatively low porosity and a low density region having a relatively high porosity. Excellent charge / discharge performance. Further, according to the bipolar electrode, the active material layer does not peel off from the metal foil, and does not fall off. Furthermore, according to the bipolar electrode, an increase in the internal pressure of the battery is suppressed.
  • FIG. 3 is a plan view of a bipolar electrode in Example 1.
  • FIG. FIG. 2 is a partial cross-sectional view taken along line II-II in FIG. 1.
  • FIG. 3 is an explanatory view showing a main part of a method for manufacturing a bipolar electrode in Example 1.
  • it is sectional drawing of the longitudinal direction at the time of the 2nd active material layer approaching between a pair of compression rolls.
  • it is sectional drawing of the width direction when both the 1st active material layer and the 2nd active material layer approached between a pair of compression rolls.
  • FIG. 4 is a cross-sectional view showing a main part of a nickel metal hydride storage battery in Example 2.
  • the metal foil functions as a current collector.
  • the current collector is a chemically inert electronic conductor that keeps current flowing through the electrode during the discharge or charging of the nickel metal hydride battery.
  • the metal constituting the current collector is not particularly limited as long as it is a metal that can withstand the voltage for reacting the active material.
  • the current collector for example, nickel foil, nickel-plated copper foil, nickel-plated stainless steel foil or the like may be employed.
  • the thickness of the metal foil may be appropriately set within a range of 5 to 100 ⁇ m, for example.
  • the first active material layer usually includes a first active material and a binder.
  • the first active material layer may further contain a known additive such as a conductive auxiliary agent.
  • the thickness of the first active material layer may be set according to the electrode characteristics. For example, the thickness of the first active material layer is 30 to 150 ⁇ m.
  • the second active material layer usually contains a second active material and a binder.
  • the second active material layer may further contain a known additive such as a conductive auxiliary.
  • the thickness of the second active material layer may be set according to the electrode characteristics. For example, the thickness of the second active material layer is 30 to 150 ⁇ m.
  • the binder in these active material layers has a function of connecting the active material and the like to the surface of the metal foil.
  • the binder those known for nickel-metal hydride storage batteries can be used.
  • the binder include fluorine-containing resins such as polyvinylidene fluoride, polytetrafluoroethylene and fluororubber, polyolefin resins such as polypropylene and polyethylene, imide resins such as polyimide and polyamideimide, carboxymethylcellulose, methylcellulose and hydroxypropylcellulose.
  • (Meth) acrylic resins containing (meth) acrylic acid derivatives such as cellulose derivatives, polyacrylic acid, polyacrylic acid ester, polymethacrylic acid and polymethacrylic acid ester as monomer units can be used.
  • the second active material layer has a low density region and a high density region.
  • a method for forming these regions for example, the following method is adopted. That is, the porosity of the low density region is reduced by using a slurry having a different content of the second active material, particle size distribution, binder content, etc. from the slurry used for forming the high density region. A method of making the size larger than that of the high density region may be adopted.
  • a method may be employed in which the slurry is applied thicker in the high density region than in the low density region, and the high density region is compressed by pressing to increase the porosity.
  • a method may be adopted. These methods may be performed alone or a plurality of methods may be used in combination.
  • a method of making a difference in the press amount is preferable.
  • the porosity is different only by one type of slurry, it is not necessary to prepare a plurality of slurries for forming the second active material layer.
  • the void ratio varies depending on the press amount, so that the slurry application amount can be easily managed. Therefore, by adopting a method of making a difference in the press amount, the above-described complicated preparation and precise management of the application amount are not required. As a result, the bipolar electrode manufacturing process is simplified.
  • the high-density region of the second active material layer is preferably disposed at a position overlapping with at least a part of the first active material layer.
  • the electrode reacts more actively in a high density region where the porosity is relatively small and the electrode reaction efficiency is high, the charge / discharge efficiency of the nickel-metal hydride storage battery is further increased.
  • the porosity of the high density region is preferably 28 to 40%. Thereby, the efficiency of the electrode reaction in the high density region is further improved. As a result, the charge / discharge efficiency of the nickel metal hydride storage battery is further improved.
  • the porosity in the low density region is preferably 56 to 63%. Thereby, a larger amount of oxygen gas is absorbed in the low density region. As a result, the increase in the internal pressure of the nickel metal hydride storage battery is more effectively suppressed. Further, in this case, since a larger amount of electrolyte is retained in the low density region, the life characteristics of the nickel-metal hydride storage battery are further improved.
  • the thickness of the low density region may be larger than the thickness of the high density region.
  • the nickel metal hydride storage battery has an electrode assembly in which a plurality of electrodes are stacked via a separator.
  • the electrode assembly including the bipolar electrode a so-called dead layer in which no first active material layer exists between the second active material layer of the bipolar electrode and the current collector of the electrode adjacent to the bipolar electrode. A space is formed.
  • the low density region is disposed at the peripheral portion of the second active material layer, the low density region is disposed in the dead space. And the increase of the dimension of the lamination direction of an electrode assembly is suppressed by arrange
  • the first active material layer and the second active material layer do not face each other, so that the electrode reaction hardly occurs. Therefore, by arranging the low density region in the dead space, the contribution of the electrode reaction in the high density region where the efficiency of the electrode reaction is high is relatively increased, and the charge / discharge efficiency of the nickel metal hydride storage battery is further increased.
  • ⁇ / RTI> Between the low density region and the high density region, an intermediate region having a larger thickness as it is closer to the low density region may be interposed. In this case, even when the bipolar electrode is arranged slightly deviated from a desired position during the assembly operation of the electrode assembly, an increase in the dimension of the electrode assembly in the stacking direction is suppressed. Therefore, the workability of the assembly work of the electrode assembly is improved.
  • the first active material layer is a positive electrode active material layer and the second active material layer is a negative electrode active material layer.
  • oxygen gas generated from the positive electrode during overcharge is absorbed into the negative electrode active material layer.
  • the second active material layer is a negative electrode active material layer
  • hydrogen as a charge reserve is provided in advance in a low density region of the second active material layer. Therefore, the oxygen gas absorbed in the negative electrode active material reacts with hydrogen as a charge reserve and is returned to water. As a result, an increase in the internal pressure of the battery due to the accumulation of oxygen gas is more effectively suppressed.
  • nickel hydroxide Ni (OH) 2
  • a hydrogen storage alloy is used, for example.
  • the electrode assembly of the nickel metal hydride storage battery is configured by laminating a plurality of electrodes including the bipolar electrode described above via a separator. That is, the nickel metal hydride storage battery including the bipolar electrode has an electrode assembly in which a plurality of electrodes are stacked with a separator interposed therebetween. And the electrode assembly has the termination electrode arrange
  • the nickel-metal hydride storage battery has excellent charge / discharge performance as described above by employing the bipolar electrode in the electrode assembly. Moreover, according to the said nickel hydride storage battery, an active material layer does not peel from metal foil, and does not drop
  • the number of bipolar electrodes included in the electrode assembly may be one or more.
  • the separator may be a nonwoven fabric or a woven fabric composed of a synthetic resin such as polytetrafluoroethylene, polypropylene, polyethylene, polyimide, polyamide, or the like.
  • the separator may be a porous body made of an electrically insulating material such as ceramics.
  • the separator may be a laminate in which two or more layers of the above-described nonwoven fabric, woven fabric, and porous body are laminated.
  • the nickel metal hydride storage battery has a high energy density and maintains a high battery capacity over a long period of time. Therefore, the nickel metal hydride storage battery is used for vehicles such as forklifts, hybrid vehicles, and electric vehicles.
  • the bipolar electrode 1 has a metal foil 2, a first active material layer 3 provided on the front side surface of the metal foil 2, and a larger area than the first active material layer 3. And a second active material layer 4 provided on the back side surface of the metal foil 2.
  • the second active material layer 4 is disposed at a peripheral portion in a plan view when viewed from the thickness direction of the metal foil 2, and is disposed on the inner side of the low density region 41, and has a void more than the low density region 41.
  • a high-density region 42 having a small rate.
  • the metal foil 2 of this example has a rectangular shape in plan view as viewed from the thickness direction.
  • the metal foil 2 has a length of 350 mm, a width of 220 mm, and a thickness of 25 ⁇ m.
  • the metal foil 2 in this example is a nickel foil.
  • the first active material layer 3 On the front side surface of the metal foil 2, a first active material layer 3 having a rectangular shape in a plan view as viewed from the thickness direction is provided.
  • the first active material layer 3 in this example is a positive electrode active material layer, and includes nickel hydroxide as a positive electrode active material, an acrylic resin emulsion and carboxymethyl cellulose as a binder.
  • the dimensions of the first active material layer 3 are a length of 336 mm, a width of 206 mm, and a thickness of 90 ⁇ m.
  • the second active material layer 4 On the back side surface of the metal foil 2, a second active material layer 4 having a rectangular shape in a plan view as viewed from the thickness direction is provided.
  • the second active material layer 4 in this example is a negative electrode active material layer, and includes a hydrogen storage alloy as a negative electrode active material, an acrylic resin emulsion and carboxymethyl cellulose as a binder.
  • the second active material layer 4 has a length of 340 mm and a width of 210 mm.
  • low density regions 41 extending along the long sides of the second active material layer 4 are provided at both ends in the width direction of the second active material layer 4.
  • the low density region 41 has a thickness of 110 ⁇ m and a porosity of 56 to 63%.
  • a high-density region 42 having a rectangular shape is provided on the inner side in the width direction than these low-density regions 41. As shown in FIGS. 1 and 2, the high-density region 42 is disposed at a position overlapping the entire first active material layer 3 in a plan view as viewed from the thickness direction of the metal foil 2.
  • the thickness of the high density region 42 is 70 ⁇ m, and the porosity is 28 to 40%.
  • the porosity of the low density region 41 and the high density region 42 can be obtained by the following measuring method. That is, a sample was taken for measurement from each region, by dividing the mass (g) of the sample volume (cm 3), to calculate the electrode density (g / cm 3) of sample containing voids. In addition, based on the volume ratio (volume%) and true density (g / cm 3 ) of the material contained in this sample, the electrode density (g / cm 3 ) of the sample when it is assumed that there is no void is calculated. To do.
  • the sample filling rate ( %) Is obtained.
  • a value obtained by subtracting the filling rate (%) from 100% is the porosity (%).
  • an intermediate region 43 having a larger thickness as it is closer to the low density region 41 is interposed between the low density region 41 and the high density region 42.
  • the bipolar electrode 1 of this example is manufactured by the method shown in FIG. 3, for example.
  • the metal foil 2 is drawn from the metal foil roll 20 and conveyed along the conveyance direction 800.
  • the first active material layer 3 having a uniform thickness and the above-described dimensions is formed on the front side surface of the metal foil 2.
  • the second active material layer 4 having a uniform thickness and the above-described dimensions is formed on the back side surface of the metal foil 2.
  • these active material layers 3 and 4 are formed by apply
  • the metal foil 2 on which the active material layers 3 and 4 are formed is passed between a pair of compression rolls 8 (8a and 8b) rotating in the direction of the arrow 801, whereby the first active material layer 3 and The second active material layer 4 is pressed.
  • a pair of compression rolls 8 (8a and 8b) rotating in the direction of the arrow 801, whereby the first active material layer 3 and The second active material layer 4 is pressed.
  • the first active material layer 3 does not exist on the front side surface of the metal foil 2 as shown in FIG. 4. Therefore, the entire range in the width direction of the second active material layer 4 is pressed by the pair of compression rolls 8.
  • both the first active material layer 3 and the second active material layer 4 enter between the pair of compression rolls 8, the width direction, that is, the conveyance direction 800 and the thickness direction of the metal foil 2.
  • both the first active material layer 3 and the second active material layer 4 are pressed at the central portion in the direction orthogonal to both.
  • the high-density region 42 is formed at the center in the width direction of the second active material layer 4.
  • a gap is formed between the foil 2 and the foil 2.
  • the second active material layer 4 is separated from the compression roll 8b at both ends in the width direction, and the low density region 41 is formed.
  • the second active material layer 4 is compressed between the high density region 42 and the low density region 41 according to the distance between the metal foil 2 and the compression roll 8b. As a result, an intermediate region 43 having a larger thickness as it is closer to the low density region 41 is formed.
  • the entire range in the width direction of the second active material layer 4 is the same as in FIG. Is pressed by a pair of compression rolls 8. Therefore, the porosity of both end portions 44 (see FIG. 1) in the longitudinal direction of the second active material layer 4 is a value that is about the middle between the high-density region 42 and the low-density region 41.
  • the bipolar electrode 1 is obtained by cutting the metal foil 2 into a desired dimension.
  • the bipolar electrode 1 does not simply increase the porosity of the second active material layer 4, but is provided with a low density region 41 at a specific position of the peripheral edge of the second active material layer 4. Therefore, the total amount of oxygen gas that can be absorbed in the second active material layer 4 is increased, and an increase in the internal pressure of the nickel-metal hydride storage battery is suppressed. Furthermore, the amount of the electrolytic solution retained in the low density region 41 is increased, and the concentration of current in the portion where the electrolytic solution remains due to the local disappearance of the electrolytic solution during overcharge is alleviated. As a result, the performance of the nickel hydride storage battery is maintained over a long period of time.
  • the second active material layer 4 is sufficiently secured to the metal foil 2 in the high-density region 42 having a relatively small porosity. As a result, the second active material layer 4 does not peel from the metal foil 2 and does not fall off. Further, the charge / discharge efficiency is increased by reducing the porosity of the high-density region 42.
  • the high-density region 42 of the second active material layer 4 is disposed at a position overlapping the first active material layer 3 in a plan view as viewed from the thickness direction of the metal foil 2. ing. Therefore, the electrode reaction can be actively caused in the high-density region 42 having a relatively low porosity and high electrode reaction efficiency. As a result, the charge / discharge efficiency of the nickel metal hydride storage battery is further increased.
  • the porosity of the high-density region 42 is 28 to 40%. Thereby, the efficiency of the electrode reaction in the high-density region 42 is further improved. As a result, the charge / discharge efficiency of the nickel metal hydride storage battery is further improved.
  • the porosity of the low density region 41 is 56 to 63%. Thereby, a large amount of oxygen gas is absorbed by the low density region 41 of the second active material layer 4. As a result, the increase in the internal pressure of the nickel metal hydride storage battery is more effectively suppressed. Further, by setting the porosity of the low density region 41 to the above specific range, a larger amount of electrolyte solution is held in the low density region 41. Therefore, the life characteristics of the nickel metal hydride storage battery are further improved.
  • the first active material layer 3 is a positive electrode active material layer
  • the second active material layer 4 is a negative electrode active material layer.
  • the bipolar electrode 1 has excellent charge / discharge performance. Moreover, according to the bipolar electrode 1, the active material layers 3 and 4 are not peeled off from the metal foil 2 and are not dropped off. Furthermore, according to the bipolar electrode 1, an increase in the internal pressure of the battery is suppressed.
  • Example 2 This example is an example of a nickel metal hydride storage battery 5 having a bipolar electrode 1.
  • the same reference numerals as those used in the above-described embodiments represent the same constituent elements as those in the above-described embodiments unless otherwise specified.
  • the nickel metal hydride storage battery 5 includes an electrode assembly 10 in which a plurality of electrodes 1, 11, and 12 are stacked with a separator 13 interposed therebetween.
  • the separator 13 the nonwoven fabric made from polyolefin fiber is used.
  • the electrode assembly 10 includes termination electrodes 11 and 12 disposed at both ends in the stacking direction, and a bipolar electrode 1 disposed between the termination electrodes 11 and 12, respectively.
  • the electrode assembly 10 of this example includes a plurality of bipolar electrodes 1 between a first termination electrode 11 disposed at one end in the stacking direction and a second termination electrode 12 disposed at the other end. ing.
  • the plurality of bipolar electrodes 1 are laminated so that a first active material layer 3, a metal foil 2 as a current collector, a second active material layer 4, and a separator 13 are repeatedly arranged in this order.
  • the high-density region 42 of the second active material layer 4 in each bipolar electrode 1 is disposed at a position facing the first active material layer 3 of the adjacent electrodes 1 and 11 and the separator 13. Further, in the low density region 41 of each bipolar electrode 1, the first active material layer 3 does not exist between the dead space of the electrode assembly 10, that is, the metal foil 2 of the adjacent electrodes 1, 11, 12. Placed in the part.
  • the first terminal electrode 11 has a metal foil 2 and a first active material layer 3 provided on one surface thereof.
  • the first active material layer 3 of the first terminal electrode 11 faces the second active material layer 4 of the bipolar electrode 1 a disposed at one end in the stacking direction via the separator 13.
  • the second termination electrode 12 has a metal foil 2 and a second active material layer 4 provided on one surface thereof.
  • the second active material layer 4 of the second terminal electrode 12 faces the first active material layer 3 of the bipolar electrode 1b disposed at the other end in the stacking direction via the separator 13.
  • the electrode assembly 10 is accommodated in a cylindrical case 51.
  • the open end of the case 51 is closed by the first plate 52 and the second plate 53.
  • the internal space surrounded by the case 51, the first plate 52, and the second plate 53 is filled with an electrolytic solution.
  • electrolyte solution well-known electrolyte solution for nickel hydride storage batteries, such as potassium hydroxide aqueous solution, can be used, for example.
  • the case 51 is made of an insulating resin such as polypropylene, polyphenyl sulfide, or modified polyphenylene ether.
  • An outer peripheral edge 23 of the metal foil 2 of the bipolar electrode 1 is held on the inner wall of the case 51.
  • the first plate 52 is made of metal and is in contact with the metal foil 2 of the first terminal electrode 11 and one opening end surface 511 of the case 51.
  • a first electrode terminal 521 is attached to a portion of the first plate 52 exposed to the outside of the case 51.
  • the first electrode terminal 521 is electrically connected to the first terminal electrode 11 through the first plate 52.
  • the second plate 53 is in contact with the metal foil 2 of the second terminal electrode 12 and the other opening end surface 512 of the case 51.
  • a second electrode terminal 531 is attached to a portion of the second plate 53 exposed to the outside of the case 51.
  • the second electrode terminal 531 is electrically connected to the second terminal electrode 12 through the second plate 53.
  • the outer peripheral edges of the first plate 52 and the second plate 53 extend outward from the case 51.
  • the outer peripheral edge of the first plate 52 and the outer peripheral edge of the second plate 53 are fastened by bolts 541 and nuts 542 via an insulating member (not shown).
  • the first plate 52 and the second plate 53 are in close contact with the open end surfaces 511 and 512 of the case 51, and the open end of the case 51 is closed.
  • the nickel metal hydride storage battery 5 has excellent charge / discharge performance as described above by employing the bipolar electrode 1 for the electrode assembly 10. Further, according to the nickel metal hydride storage battery 5, the second active material layer 4 does not peel from the metal foil 2 and does not fall off. Furthermore, according to the nickel metal hydride storage battery 5, an increase in the internal pressure of the battery is suppressed.
  • the low density region 41 of the second active material layer 4 is disposed in the dead space of the electrode assembly 10. Therefore, an increase in the dimension of the electrode assembly 10 in the stacking direction is suppressed. Moreover, by arranging the low density region 41 in the dead space, the electrode reaction in the low density region 41 having a relatively large porosity and low electrode reaction efficiency is suppressed. Thereby, the contribution of the electrode reaction in the high-density region 42 where the electrode reaction efficiency is high is relatively increased, and the charge / discharge efficiency of the nickel-metal hydride storage battery 5 is further increased.
  • an intermediate region 43 having a larger thickness as it is closer to the low density region 41 is interposed between the low density region 41 and the high density region 42. Therefore, even when the bipolar electrode 1 is arranged slightly deviated from a desired position during the assembly operation of the electrode assembly 10, an increase in the dimension in the stacking direction of the electrode assembly 10 is suppressed. Therefore, the workability of the assembly work of the electrode assembly 10 is improved.
  • the aspects of the bipolar electrode 1 and the nickel metal hydride storage battery 5 according to the present invention are not limited to the aspects shown in the first and second embodiments, and the configuration can be changed as appropriate without departing from the scope of the invention. .

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Abstract

La présente invention concerne une électrode bipolaire qui comprend : une feuille métallique ; une première couche de substance active disposée sur la surface côté avant de la feuille métallique ; et une deuxième couche de substance active ayant une aire de surface plus grande que la première couche de substance active et disposée sur la surface côté arrière de la feuille métallique. La deuxième couche de substance active comporte une région de faible densité disposée au niveau du bord périphérique de celle-ci dans une vue en plan telle qu'observée depuis la direction de l'épaisseur de la feuille métallique, et une région de densité élevée disposée vers l'intérieur depuis la région de faible densité et ayant un pourcentage de vide plus faible que la région de faible densité.
PCT/JP2017/042483 2016-11-30 2017-11-28 Électrode bipolaire pour accumulateur au nickel-hydrogène et accumulateur au nickel-hydrogène Ceased WO2018101224A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE112017006067.2T DE112017006067B4 (de) 2016-11-30 2017-11-28 Bipolare Elektrode für eine Nickel-Wasserstoff-Speicherbatterie und eine Nickel-Wasserstoff-Speicherbatterie
CN201780073897.2A CN110024205B (zh) 2016-11-30 2017-11-28 镍氢蓄电池用双极电极和镍氢蓄电池
US16/462,762 US10693175B2 (en) 2016-11-30 2017-11-28 Bipolar electrode for nickel-hydrogen storage battery and nickel-hydrogen storage battery

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020061223A (ja) * 2018-10-05 2020-04-16 株式会社豊田自動織機 ニッケル水素蓄電池の製造方法

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5441430A (en) * 1977-07-08 1979-04-02 Gould Inc Novel electrode structure for alkaline battery system
JP2004031140A (ja) * 2002-06-26 2004-01-29 Sanyo Electric Co Ltd 角形アルカリ二次電池
JP2007042385A (ja) * 2005-08-02 2007-02-15 Nissan Motor Co Ltd 電池用電極
JP2007329077A (ja) * 2006-06-09 2007-12-20 Matsushita Electric Ind Co Ltd 非水電解質二次電池およびその製造方法
JP2008078109A (ja) * 2006-08-25 2008-04-03 Toyota Motor Corp 蓄電装置用電極及び蓄電装置
JP2013008523A (ja) * 2011-06-23 2013-01-10 Hitachi Vehicle Energy Ltd 電池用電極及びその製造方法
JP2013020802A (ja) * 2011-07-11 2013-01-31 Hitachi Ltd 蓄電池、組電池、組電池設置方法、電極群、電極群の製造方法
JP2014102896A (ja) * 2012-11-16 2014-06-05 Toyota Industries Corp 蓄電装置及び二次電池並びに電極の製造方法
JP2014107218A (ja) * 2012-11-29 2014-06-09 Toyota Industries Corp 蓄電装置及び電極組立体の製造方法

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5441430A (en) * 1977-07-08 1979-04-02 Gould Inc Novel electrode structure for alkaline battery system
JP2004031140A (ja) * 2002-06-26 2004-01-29 Sanyo Electric Co Ltd 角形アルカリ二次電池
JP2007042385A (ja) * 2005-08-02 2007-02-15 Nissan Motor Co Ltd 電池用電極
JP2007329077A (ja) * 2006-06-09 2007-12-20 Matsushita Electric Ind Co Ltd 非水電解質二次電池およびその製造方法
JP2008078109A (ja) * 2006-08-25 2008-04-03 Toyota Motor Corp 蓄電装置用電極及び蓄電装置
JP2013008523A (ja) * 2011-06-23 2013-01-10 Hitachi Vehicle Energy Ltd 電池用電極及びその製造方法
JP2013020802A (ja) * 2011-07-11 2013-01-31 Hitachi Ltd 蓄電池、組電池、組電池設置方法、電極群、電極群の製造方法
JP2014102896A (ja) * 2012-11-16 2014-06-05 Toyota Industries Corp 蓄電装置及び二次電池並びに電極の製造方法
JP2014107218A (ja) * 2012-11-29 2014-06-09 Toyota Industries Corp 蓄電装置及び電極組立体の製造方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020061223A (ja) * 2018-10-05 2020-04-16 株式会社豊田自動織機 ニッケル水素蓄電池の製造方法
JP7095539B2 (ja) 2018-10-05 2022-07-05 株式会社豊田自動織機 ニッケル水素蓄電池の製造方法

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