WO2008120057A2 - Dispositif de stockage d'électricité - Google Patents

Dispositif de stockage d'électricité Download PDF

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Publication number
WO2008120057A2
WO2008120057A2 PCT/IB2008/000596 IB2008000596W WO2008120057A2 WO 2008120057 A2 WO2008120057 A2 WO 2008120057A2 IB 2008000596 W IB2008000596 W IB 2008000596W WO 2008120057 A2 WO2008120057 A2 WO 2008120057A2
Authority
WO
WIPO (PCT)
Prior art keywords
electrically conductive
electricity storage
conductive elements
storage device
stacking direction
Prior art date
Application number
PCT/IB2008/000596
Other languages
English (en)
Other versions
WO2008120057A3 (fr
Inventor
Yuji Nishi
Original Assignee
Toyota Jidosha Kabushiki Kaisha
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 Toyota Jidosha Kabushiki Kaisha filed Critical Toyota Jidosha Kabushiki Kaisha
Publication of WO2008120057A2 publication Critical patent/WO2008120057A2/fr
Publication of WO2008120057A3 publication Critical patent/WO2008120057A3/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0413—Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes
    • H01M10/0418—Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes with bipolar electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/54—Connection of several leads or tabs of plate-like electrode stacks, e.g. electrode pole straps or bridges
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6553—Terminals or leads
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
    • 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 invention relates to an electricity storage device, such as a secondary battery, in which a plurality of electrodes are stacked with electrolyte layers interposed therebetween.
  • Secondary batteries have been used as batteries for use in driving motors in electric vehicles (EV), hybrid vehicles (HEV), fuel cell vehicles (FCV), and the like.
  • EV electric vehicles
  • HEV hybrid vehicles
  • FCV fuel cell vehicles
  • high output power and high energy density are required, and battery packs are therefore used, in which a plurality of cells are stacked and electrically connected in series.
  • the voltage detection tab(s) are provided to monitor whether each cell is working normally (see Japanese Patent Application Publication Nos. 2005-11658 (paragraph 0014, FIGS. 2 and 3, for example), 2006-127857 (paragraphs 0032-0036, FIGS. 15 and 16, for example), 2006-156357 (paragraphs 0022-0029, FIG 2, for example), 2002-231300 (paragraphs 0030 and 0031, FIGS. 1 and 2, for example), 2005-235428 (paragraphs 0014 and 0015, FIG 2, for example), and 2004-158222 (paragraphs 0058 and 0059, FIG 7, for example).
  • a protruding, voltage detection tab is integrally provided on the positive electrode layer of each cell, and the voltage detection tabs are positioned so as not to overlap each other when viewed in the stacking direction.
  • the voltage detection tabs integrally provided on the respective positive electrode layers protrude from the positive electrode layers in the direction perpendicular to the stacking direction, and reservation of the space that accommodates the protruding portions results in increase in size of the battery. In other words, in the plane perpendicular to the stacking direction, the area in which neither the positive electrode layer nor the voltage detection tab is formed is wasted.
  • An object of the invention is to provide an electricity storage device that is configured so as to be able to detect the voltage across each cell, and with which it is possible to reduce idle portions and bring about reduction in size.
  • An electricity storage device includes: an electrolyte layer; a plurality of electrodes that are stacked with the electrolyte layer interposed between each pair of the adjacent electrodes, and that substantially coincide with each other when viewed in a direction in which the electrodes are stacked; and a plurality of electrically conductive elements, one ends of which are exposed to the outside of the electricity storage device, and the other ends of which are electrically connected to the associated electrodes, respectively, the electrically conductive elements being extended in the stacking direction in the electricity storage device.
  • Each of the electrically conductive elements may include an electrically conductive portion made of an electrically conductive material, and an electrically insulating portion.
  • the plurality of electrically conductive elements may be arranged along a predetermined direction in a plane perpendicular to the stacking direction.
  • One ends of one part of the electrically conductive elements may be exposed at one end surface of the electricity storage device in the stacking direction, and one ends of the other part of the electrically conductive elements may be exposed at the other end surface of the electricity storage device in the stacking direction.
  • the plurality of electrically conductive elements are symmetrically (point-symmetrically or line-symmetrically) arranged in a section including the plurality of electrically conductive elements, the section being taken along the stacking direction.
  • An electricity storage device may include: a plurality of electricity storage units, in each of which a plurality of electrodes are stacked with an electrolyte layer interposed between each pair of the adjacent electrodes, wherein the plurality of electricity storage units are stacked with an electric current output member interposed between each pair of the adjacent electricity storage units; a plurality of electrically conductive elements extending in a direction in which the electrodes are stacked, and electrically connecting equipotential surfaces in the plurality of electricity storage units, one ends of the plurality of electrically conductive elements being exposed to an outside of the electricity storage device.
  • a plurality of electrically conductive elements are connected to the electrodes, respectively, which are placed at positions different from each other in the stacking direction, and it is therefore possible to detect the voltage across each of the cells constituting an electricity storage device.
  • the electrically conductive elements are extended in the stacking direction in the electricity storage device, so that it is possible to prevent generation of idle portions caused by forming the electrically conductive elements in the electricity storage device.
  • FIG 1 is a perspective view showing an external appearance of a bipolar battery of a first embodiment of the invention
  • FIG 2 is a schematic diagram showing a partial section of the bipolar battery of the first embodiment
  • FIG 3 is a detailed diagram showing a partial section of the bipolar battery of the first embodiment
  • FIG 4 is a diagram for illustrating positions at which electrically conductive elements are formed in the first embodiment
  • FIG 5 is a schematic diagram showing a partial section of a bipolar battery of a modification of the first embodiment.
  • FIG 6 is a schematic diagram showing a bipolar battery of a second embodiment of the invention.
  • FIG 1 is a perspective view showing an external appearance of the bipolar battery.
  • FIG 2 is a sectional view showing a schematic configuration of part of the bipolar battery, showing a section taken along the line H-II of FIG 1.
  • FIG 3 is a detailed diagram showing the configuration shown in FIG 2.
  • the bipolar battery which is the first embodiment of the invention described below, may be mounted on a vehicle or the like.
  • the bipolar battery 100 of the first embodiment is obtained by stacking a plurality of cells 1 and electrically connecting the plurality of cells 1 in series.
  • the cell 1 is an electricity generating element that includes a solid electrolyte layer, and a positive and a negative electrode layer disposed on both sides of the solid electrolyte layer, respectively, as described later.
  • a positive electrode tab 15 and a negative electrode tab 16 for outputting electric current are respectively provided on the end surfaces of the bipolar battery 100 in the stacking direction (Z direction) as shown in FIG 1.
  • the positive electrode tab 15 and the negative electrode tab 16 are connected to an electric device (not shown), such as a motor.
  • the positive electrode layer 12 is formed on one of the major surfaces of a current collector 11, and the negative electrode layer 13 is formed on the other major surface thereof.
  • a bipolar electrode (electrode part) 10 is the current collector 11 that is provided with the positive electrode layer 12 and the negative electrode layer 13.
  • a plurality of the current collectors 11 are stacked so that the positive electrode layer 12 is formed on one of the opposed surfaces of the adjacent current collectors 11, and that the negative electrode layer 13 is formed on the other of the opposed surfaces thereof.
  • the current collector 11 is formed in a substantially rectangular shape when viewed in the stacking direction, which shape may include an error caused during manufacture.
  • the positive electrode layer 12 and the negative electrode layer 13 are formed almost all over the surface on each side of the current collector 11.
  • bipolar electrode 10 is used in the description of this embodiment, the invention is not limited to this embodiment, and electrodes different from the bipolar electrode 10 may be used. Specifically, electrodes, in each of which electrode layers of the same pole (positive electrode layers or negative electrode layers) are formed on both sides of a current collector, or electrodes, in each of which an electrode layer is formed on one side of a current collector, may be used.
  • the invention can be applied to an electric double layer capacitor, which may be regarded as an electricity storage device.
  • the capacitor is obtained by alternately stacking a plurality of positive electrodes and a plurality of negative electrodes with separators interposed therebetween.
  • an aluminum foil can be used as the current collector
  • activated carbon can be used as an active material for positive electrodes and an active material for negative electrodes
  • a porous film, which is made of polyethylene can be used as a separator.
  • the current collector 11 may be made of an aluminum foil, or a plurality of metallic materials, for example. One which is obtained by coating a metallic material with aluminum can also be used as the current collector 11.
  • a so-called composite current collector which is obtained by laminating a plurality of metal foils, can also be used.
  • aluminum for example, can be used as a material for positive-electrode current collectors
  • nickel or copper for example, can be used as a material for negative-electrode current collectors.
  • the composite current collector one in which a positive-electrode current collector and a negative-electrode current collector are in direct contact with each other, or one that has an electrically conductive layer interposed between a positive-electrode current collector and a negative-electrode current collector, can be used.
  • Each of the electrode layers 12 and 13 contains an active material corresponding to the pole of the layer.
  • each of the electrode layers 12 and 13 contains, as needed, an electrically conductive additive and a binder, and in addition, an inorganic electrolyte, a polymer gel electrolyte, a polymer electrolyte and/or ah additive that improve ionic conduction properties.
  • a nickel oxide can be used as an active material for the positive electrode layer 12, and a hydrogen-absorbing alloy, such as MmNi (5 . ⁇ -y - z) Al x Mn y Co z (Mm: misch metal), can be used as an active material for the negative electrode layer 13.
  • a lithium-transition metal composite oxide can be used as an active material for the positive electrode layer 12, and carbon can be used as an active material for the negative electrode layer 13.
  • an electrically conductive additive acetylene black, carbon black, graphite, carbon fiber, or carbon nanotubes can be used.
  • a solid electrolyte layer 14 is placed between bipolar electrodes 10 that are adjacent to each other in the stacking direction. Specifically, the solid electrolyte layer 14 is placed between the positive electrode layer 12 of one bipolar electrode 10 and the negative electrode layer 13 of the other bipolar electrode 10.
  • the solid electrolyte layers 14 are formed in a substantially rectangular shape (which shape" may include an error caused during manufacture) and placed so as to coincide with the current collector 11 when viewed in the stacking direction.
  • the solid electrolyte may be added to the electrode layers 12 and 13 to increase the reaction area to thereby improve ionic conduction properties and reduce resistance of the electrode layers 12 and 13 as needed.
  • inorganic solid electrolyte and/or polymer solid electrolyte can be used.
  • inorganic electrolyte lithium nitride, lithium halide, lithium oxysalt, and lithium phosphorus sulfide can be used, for example.
  • polymer solid electrolyte an electrolyte obtained by complexing alkali metal salt with a polymer compound, such as polyethylene oxide (PEO), poly(propylene oxide) (PPO), can be used.
  • alkali metal salt lithium perchlorate (LiClO 4 ) and lithium borate tetrafluoride (LiBF 4 ) can be used, for example.
  • An inorganic solid electrolyte and a polymer solid electrolyte are used in combination.
  • a plurality of electrically conductive elements 2a to 2h are formed in the bipolar battery 100.
  • One ends of the electrically conductive elements 2a to 2h are exposed at the top surface (one end surface in the stacking direction) of the bipolar battery 100. Specifically, these ends are exposed at the upper surface of the positive electrode tab 15.
  • a wiring board (not shown), such as a flexible printed wiring board, is connected to the ends of the electrically conductive elements 2a to 2h exposed at the upper surface of the positive electrode tab 15.
  • the wiring board has a plurality of lines corresponding to the electrically conductive elements 2a to 2h, and each line is electrically and mechanically connected to the corresponding one of the electrically conductive elements 2a to 2h.
  • the wiring board (the plurality of lines) is connected to a voltage detection circuit (not shown).
  • the bipolar battery 100 in actuality, the electrically conductive elements, the number of which corresponds to the number of stacked cells 1, are formed.
  • the bipolar battery 100 is configured to be able to detect the voltage across each cell 1 with the use of the electrically conductive elements 2a to 2h.
  • a control circuit (not shown) controls charging/discharging voltage on a cell-by-cell basis, based on the voltage values determined in the voltage detection circuit. Specifically, the control circuit determines the value of voltage across each cell with the use of the voltage detection circuit, and regulates the electric current that flows during charge or discharge on a cell-by-cell basis, based on the determined voltage values.
  • a control circuit that controls driving of the vehicle may perform the above-described cell charge/discharge control.
  • the electrically conductive elements 2a to 2h extends in the stacking direction (Z direction) in the bipolar battery 100, and the lengths of the electrically conductive elements 2a to 2h in the stacking direction (herein after simply referred to as "the length(s)") differ from each other.
  • the electrically conductive elements 2a to 2h are electrically and mechanically connected to the current collectors 11 of the bipolar electrodes 10, which are placed at positions different from each other in the stacking direction.
  • the electrically conductive element 2a placed at an end of the row of the electrically conductive elements is connected to the cell 1 (current collector 11) that is placed in the second layer from the top (the side on which the positive electrode tab 15 is provided) of the bipolar battery 100.
  • the electrically conductive element 2b adjacent to the electrically conductive element 2a is connected to the cell 1 (current collector 11) that is placed in the third layer from the top of the bipolar battery 100.
  • the electrically conductive element 2c is connected to the cell 1 (current collector 11) that is placed in the fourth layer from the top of the bipolar battery 100.
  • the other electrically conductive elements 2d to 2h are connected to the cells 1 (current collectors 11) that are placed in the fifth and subsequent layers from the top of the bipolar battery 100.
  • the electrically conductive element 2a includes an electrically conductive portion 2al extending in the stacking direction (Z direction), and an electrically insulating portion 2a2 covering the electrically conductive portion 2a 1.
  • Concerning the electrically conductive portion 2al it suffices that an electrically conductive material be used.
  • a metallic material can be used for the electrically conductive portion 2a 1, for example.
  • Concerning the electrically insulating portion 2a2 it suffices that a material be used that can electrically insulate the electrically conductive portion 2al from the portions (specifically, the electrode layers 12 and 13, and the solid electrolyte layer 14) other than the current collector 11 to which the electrically conductive portion is connected.
  • an epoxy resin can be used for the electrically insulating portion 2a2.
  • the configuration of the other electrically conductive elements 2b to 2h is similar to that of the above-described electrically conductive element 2a.
  • the electrically conductive elements 2a to 2h are formed near one side (a short side) of the bipolar battery 100 along the one side in this embodiment as shown in FIG. 1, the invention is not limited to the embodiment. Specifically, the electrically conductive elements 2a to 2h may be formed at any positions in the bipolar battery 100.
  • the electrically conductive elements 2a to 2h may be formed along a side corresponding to a long side of the bipolar battery 100 in plan.
  • the electrically conductive elements 2a to 2h may be formed along the chain line or the chain double-dashed line in FIG. 4.
  • the chain line is the line passing through the center of the short side, and extending in parallel with the long side in the X-Y plane of the bipolar battery 100, which is a plane perpendicular to the stacking direction.
  • the chain double-dashed line is the line passing through the center of the long side, and extending in parallel with the short side in the X-Y plane of the bipolar battery 100, which is a plane perpendicular to the stacking direction.
  • the electrically conductive elements 2a to 2h may be arranged near a short side of the bipolar battery 100 along the short side as in the case of this embodiment.
  • the bipolar battery 100 of this embodiment it is possible to form the current collector 11, the electrode layers 12 and 13, and the solid electrolyte layer 14 with the regions, in which the electrically conductive elements 2a to 2h are formed, excluded by an application method using an ink-jet printing method or the like.
  • the insulating portion 2a2 is formed on the inner surface of each of the holes described above.
  • the electrically conductive portion 2a 1 is then formed by filling an electrically conductive material into the space defined by the insulating portion 2a2.
  • the bipolar battery 100 of this embodiment can be obtained.
  • the electrically conductive elements 2a to 2h used to detect the voltage across each cell 1 are formed so as to extend in the stacking direction in the bipolar battery 100.
  • thermo expansion that accompanies charge and discharge, for example, is suppressed by applying inward pressure from both sides in the stacking direction with the use of clamping members.
  • the electrolyte layers adjacent to each other in the stacking direction can be deformed under the pressure exerted by the clamping members in the region in which the voltage detection tabs are not formed.
  • the electrode layers 12 and 13, and the solid electrolyte layer 14 are disposed so that these layers substantially coincide when viewed in the stacking direction. Thus, it is possible to exert substantially uniform pressure on all of the cells 1.
  • FIG 5 is a sectional view of the bipolar battery, corresponding to FIG 2 described in connection with the first embodiment.
  • the bipolar battery 200 of this modification will be specifically described below.
  • the members having the same functions as those of the corresponding members described in the description of the first embodiment are designated by the same reference numerals as those of the corresponding members.
  • one ends of all of the electrically conductive elements 2a to 2h are exposed at one end surface (top surface) of the bipolar battery 100 in the stacking direction.
  • one ends of the electrically conductive elements 2a to 2z are exposed at both end surfaces (top and bottom surfaces) of the bipolar battery 200 in the stacking direction.
  • the electrically conductive elements that are positioned above the center of the bipolar battery 200 in the stacking direction are defined as the elements that belong to a first electrically conductive element group Ll.
  • this first electrically conductive element group Ll the length of the electrically conductive elements in the stacking direction becomes longer in order from the electrically conductive element 2a that is located nearest to a side (on the left side in FIG 5) of the bipolar battery 200.
  • one ends of the electrically conductive elements 2a to 2d that belong to the electrically conductive element group Ll are exposed at the top surface of the bipolar battery 200, and the other ends thereof are electrically and mechanically connected to the respective cells 1, which are placed at positions different from each other in the stacking direction.
  • the electrically conductive elements that are positioned below the center of the bipolar battery 200 in the stacking direction are defined as the elements that belong to a second electrically conductive element group L2.
  • the length of the electrically conductive elements in the stacking direction becomes longer in order from the electrically conductive element 2z that is located nearest to a side (on the right side in FIG 5) of the bipolar battery 200.
  • one ends of the electrically conductive elements 2w to 2z that belong to the electrically conductive element group L2 are exposed at the bottom surface of the bipolar battery 200, and the other ends thereof are electrically and mechanically connected to the respective cells 1, which are placed at positions different from each other in the stacking direction.
  • the electrically conductive elements 2a to 2z are connected to respective different cells 1 in the bipolar battery 200.
  • the electrically conductive elements 2a to 2d of the first electrically conductive element group Ll and the electrically conductive elements 2w to 2z of the second electrically conductive element group L2 are arranged point symmetrically with respect to a particular point (the center C of the section shown in FIG 5) in the sectional plane in which the electrically conductive elements 2a to 2z are arranged.
  • the bipolar battery 200 of the modification is obtained by separately forming a stack that includes the first electrically conductive element group Ll and a stack that includes the second electrically conductive element group L2, and joining the stacks.
  • the electrically conductive elements 2a to 2d and the electrically conductive elements 2w to 2z are point-symmetrically arranged in the modification, the invention is not limited to this embodiment.
  • the electrically conductive elements 2a to 2d, and the electrically conductive elements 2w to 2z may be line-symmetrically arranged.
  • the electrically conductive elements may be arranged line symmetrically with respect to the line that passes through the center of the section shown in FIG 5 and extends in the X direction.
  • the bipolar battery 200 of the modification can be manufactured by a method similar to that described in connection with the first embodiment.
  • advantageous effects similar to those achieved by the first embodiment are also achieved by the bipolar battery 200.
  • the modification has a configuration in which the first and second electrically conductive element groups Ll and L2 are point symmetric. Thus, it suffices to form one of the stacks that include the first electrically conductive element group Ll and the second electrically conductive element group L2, respectively. Accordingly, it is possible to easily manufacture the bipolar battery 200 as compared to the case where all the cells 1 constituting the bipolar battery 200 are serially formed.
  • the plurality of electrically conductive elements 2a to 2z are distributed on both sides of the central layer of the bipolar battery 200, so that it is possible to reduce the length of the electrically conductive elements in the stacking direction as compared to the configuration described in the description of the first embodiment (see FIGS. 2 and 3).
  • the length of the electrically conductive element that is placed at an end of the row of the electrically conductive elements is the longest, and is substantially equal to the thickness of the bipolar battery 100.
  • the length of the longest electrically conductive element is substantially half the thickness of the bipolar battery 200.
  • the intervals between the adjacent electrically conductive elements may be appropriately set.
  • a plurality of electrically conductive elements 2a to 2h can be arranged in the X-Y plane of the bipolar battery 100; the intervals between the plurality of electrically conductive elements 2a to 2h may be appropriately set.
  • the electrically conductive elements 2a to 2d of the first electrically conductive element group Ll, or the electrically conductive elements 2w to 2z of the second electrically conductive element group L2 may be equidistantly arranged over the entire width in the X direction of the bipolar battery 200.
  • the length of the electrically conductive elements is increased in order from one end in the X direction of the bipolar battery
  • the invention is not limited to such a configuration. Specifically, it suffices that the plurality of electrically conductive elements be connected to the respective cells 1 (current collectors 11); the relations between the length of the electrically conductive elements and the positions at which the electrically conductive elements are formed may be appropriately set.
  • the invention is not limited to such a configuration.
  • the configuration of the electrically conductive element may be arbitrary, as long as the electrically conductive element is pierced into the bipolar battery and electrically and mechanically connected to a particular cell 1 (current collector 11), and makes it possible to output voltage from the cell 1.
  • a plurality of holes extended to the respective different cells 1 in the stacking direction may be formed in the bipolar battery 100, and a metallic pin (electrically conductive element) coated or covered with an electrically insulating layer may be inserted into each of the holes.
  • the tip of the metallic pin is electrically and mechanically connected to the cell 1 (current collector 11).
  • the lengths of the metallic pins inserted into the holes are different from each other.
  • a gel electrolyte or a liquid electrolyte may be used instead of the solid electrolyte layers 14.
  • the metallic pins each coated or covered with the electrically insulating layer it is also possible to cool the inside of the bipolar battery by cooling the metallic pins. Specifically, by causing coolant (cooling air or liquid, for example) to come into contact with the metallic pins, it is possible to cool the inside of the bipolar battery through the metallic pins. On the other hand, by warming the metallic pins, it is possible to warm up (increase the temperature of) the bipolar battery. Specifically, by causing a heat-exchanging medium, which is used for warming up, to come into contact with the metallic pins, it is possible to warm the bipolar battery through the metallic pins.
  • the center portion in the plane (the X-Y plane) perpendicular to the stacking direction tends to have the highest temperature due to charge and discharge, for example. Meanwhile, the cell 1 placed in the central layer in the stacking direction tends to have a temperature higher than the cells 1 that are placed in the outer layers.
  • the lengths of the electrically conductive elements are different from each other in the first embodiment and its modification, the lengths may be equal to each other. Specifically, the lengths of all the electrically conductive elements may be substantially equal to the thickness (the length in the Z direction) of the bipolar battery.
  • the bipolar battery is configured in this way, it is possible to make the areas of all the electrode parts in the bipolar battery substantially equal to each other, and it is therefore possible to make the capacities of the cells 1 in the bipolar battery substantially equal to each other.
  • the above-described application method using an ink-jet printing method or the like it is possible to apply material in the same pattern for all of the layers (cells 1) of the bipolar battery.
  • each electrically conductive element may be constituted of the electrically conductive portion and the electrically insulating portion over the length thereof, or, alternatively, a portion of the electrically conductive element may be constituted of the electrically conductive portion and the electrically insulating portion, and the remaining portion may be constituted of the electrically insulating portion.
  • a portion thereof up to a particular cell 1 (current collector 11) that is the subject of which voltage is detected may be constituted of the electrically conductive portion 2a 1 and the electrically insulating portion 2a2, and the remaining portion that extends from the particular cell 1 to the bottom cell 1 may be constituted of the electrically insulating portion only.
  • FIG 6 is a sectional view showing a schematic configuration of the bipolar battery.
  • the bipolar battery 300 of this embodiment is obtained by stacking a plurality of battery modules (electricity storage units) 30 with electric current output plates 20b and 20c interposed therebetween.
  • Each of the battery modules 30 has a configuration in which a plurality of cells 1 are stacked, and the configuration of the cell 1 is similar to that of the cell 1 described in the description of the first embodiment (see FIG 2 and 3).
  • the plurality of battery modules 30 are stacked, and the equipotential cells 1 of the battery modules 30 are electrically connected through the electrically conductive elements 2a to 2z. This will be specifically described below.
  • the plurality of battery modules 30 have the same configuration, and each of the battery modules 30 is designed so that an output of 256 V can be obtained.
  • the plurality of battery modules 30 are disposed so that the distribution of equipotential surfaces is symmetric with respect to each of the electric current output plates 20b and 20c.
  • each of the electrically conductive elements 2a to 2z is constituted of the electrically conductive portion made of an electrically conductive material, and the electrically insulating portion that covers the electrically conductive portion.
  • metallic pins coated or covered with an electrically insulating layer may be used instead of the electrically conductive elements 2a to 2z.
  • the electrically conductive elements 2a to 2z extend from one end surface to the other end surface of the bipolar battery 300 in the stacking direction. Specifically, the electrically conductive elements 2a to 2z penetrate the cells 1 of the battery modules 30 and the electric current output plates 20a to 20c.
  • One ends of the electrically conductive elements 2a to 2z are exposed at the top surface of the bipolar battery 300 (the top surface of the uppermost electric current output plate 20a in FIG. 6).
  • the exposed portions are electrically and mechanically connected to a plurality of lines provided on a wiring board (not shown).
  • the electrically conductive elements 2a to 2z are electrically and mechanically connected to the cells 1 , specifically, the current collectors, of the battery modules 30 at the points indicated by the filled circles (•) shown in FIG 6.
  • the filled circles on the electric current output plate 20a indicate that the electrically conductive elements 2a to 2z are electrically and mechanically connected to the wiring board.
  • the electrically conductive elements 2a to 2z are electrically isolated from the electricity storage device except the portions indicated by the filled circles.
  • the electric current output plates 20a to 2Od are connected to each other through a line, and the electric current output plates 20b and 2Od are connected to each other through another line. Specifically, the electric current output plates that have the same voltage are connected to each other.
  • the bipolar battery 300 of this embodiment can also be manufactured by the method described in connection with the first embodiment.
  • the bipolar battery 300 can be manufactured by serially forming the battery modules 30, the plurality of battery modules 30 may be separately formed, and may be stacked thereafter.
  • each of the electrically conductive elements 2a to 2z is connected to the equipotential cells 1 of the battery modules 30, and the voltage of these equipotential cells 1 is output from the top of the bipolar battery 300, so that it is possible to reduce the number of wiring boards. Specifically, it is possible to reduce the number of wiring boards as compared to the case where a wiring board used to output the voltage of each cell 1 is provided for each battery module 30. In this embodiment, one wiring board suffices.
  • the plurality of battery modules 30 are stacked with the use of the electric current output plates 20a to 2Od. Such a configuration brings about advantages described below.
  • the size of the cells 1 in the X-Y plane is set large, and such cells 1 are stacked, it is possible to obtain a high power output using the obtained battery pack. In this case, however, loss of electric current is increased as the size of the cells 1 is increased. Specifically, when the size of the cells 1 is increased, the size of the electric current output plates is also increased, which causes the resistance of the electric current output plates to increase, resulting in reduction of the amount of electric current flowing through the electric current output plates.
  • the electrically conductive elements 2a to 2z are formed to extend from one end of the bipolar battery 300 to the other end thereof in the stacking direction, the invention is not limited to this configuration. Specifically, it suffices that the equipotential cells 1 of the battery modules 30 be electrically connected through one electrically conductive element.
  • the electrically conductive element 2a shown in FIG 6 penetrates the bottom battery module 30 in FIG 6, it suffices that the electrically conductive element be formed to extend up to the position (the point indicated by the filled circle) of the cell 1 to which the electrically conductive element is electrically connected. In other words, there is no need to extend the electrically conductive element 2a to the cells 1 below the above-mentioned cell 1 to which the electrically conductive element 2a is connected.
  • connection points between the electrically conductive elements 2a to 2z and the cells 1 are positioned point symmetrically with respect to a particular point (the center of the section of the battery module 30 shown in FIG 6).
  • the connection points may be positioned line symmetrically with respect to the line passing through the particular point and extending in the X direction.
  • the electrically conductive elements are extended perpendicular to the X-Y plane (the plane perpendicular to the stacking direction), the electrically conductive elements may obliquely cross the X-Y plane.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Secondary Cells (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Electric Double-Layer Capacitors Or The Like (AREA)

Abstract

La présente invention concerne un dispositif de stockage d'électricité qui comprend : une couche électrolytique (14) ; une pluralité d'électrodes (12, 13) qui sont empilées avec la couche électrolytique interposée entre chaque paire des électrodes adjacentes, et qui coïncident sensiblement les unes aux autres lorsqu'elles sont vues dans la direction d'empilement ; et une pluralité d'éléments électriquement conducteurs (2a à 2d), dont des premières extrémités sont exposées à l'extérieur du dispositif de stockage d'électricité, et dont les autres extrémités sont connectées électriquement aux électrodes associées, respectivement, les éléments électriquement conducteurs étant étendus dans la direction d'empilement du dispositif de stockage d'électricité.
PCT/IB2008/000596 2007-03-30 2008-03-14 Dispositif de stockage d'électricité WO2008120057A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2007-090151 2007-03-30
JP2007090151A JP2008251305A (ja) 2007-03-30 2007-03-30 蓄電装置

Publications (2)

Publication Number Publication Date
WO2008120057A2 true WO2008120057A2 (fr) 2008-10-09
WO2008120057A3 WO2008120057A3 (fr) 2009-03-12

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ID=39688874

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PCT/IB2008/000596 WO2008120057A2 (fr) 2007-03-30 2008-03-14 Dispositif de stockage d'électricité

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JP (1) JP2008251305A (fr)
WO (1) WO2008120057A2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5621765B2 (ja) * 2009-03-31 2014-11-12 三洋電機株式会社 電池モジュール、バッテリシステムおよび電動車両

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3094438A (en) * 1960-02-25 1963-06-18 Union Carbide Corp Multi-plate galvanic cell
GB2176929A (en) * 1985-06-11 1987-01-07 Deutsche Automobilgesellsch Galvanic cells
US6139987A (en) * 1997-12-27 2000-10-31 Agency For Defense Development Bipolar battery
JP2005011658A (ja) * 2003-06-18 2005-01-13 Nissan Motor Co Ltd バイポーラ電池
JP2006127857A (ja) * 2004-10-27 2006-05-18 Nissan Motor Co Ltd バイポーラ電池、組電池及びそれらの電池を搭載した車両

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3094438A (en) * 1960-02-25 1963-06-18 Union Carbide Corp Multi-plate galvanic cell
GB2176929A (en) * 1985-06-11 1987-01-07 Deutsche Automobilgesellsch Galvanic cells
US6139987A (en) * 1997-12-27 2000-10-31 Agency For Defense Development Bipolar battery
JP2005011658A (ja) * 2003-06-18 2005-01-13 Nissan Motor Co Ltd バイポーラ電池
JP2006127857A (ja) * 2004-10-27 2006-05-18 Nissan Motor Co Ltd バイポーラ電池、組電池及びそれらの電池を搭載した車両

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WO2008120057A3 (fr) 2009-03-12

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