WO2010113254A1 - 二次電池および電池システム - Google Patents
二次電池および電池システム Download PDFInfo
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- WO2010113254A1 WO2010113254A1 PCT/JP2009/056648 JP2009056648W WO2010113254A1 WO 2010113254 A1 WO2010113254 A1 WO 2010113254A1 JP 2009056648 W JP2009056648 W JP 2009056648W WO 2010113254 A1 WO2010113254 A1 WO 2010113254A1
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- Prior art keywords
- sheet
- electrode terminal
- insulating
- battery
- positive electrode
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0413—Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0436—Small-sized flat cells or batteries for portable equipment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L50/00—Electric propulsion with power supplied within the vehicle
- B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
- B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries
- B60L50/64—Constructional details of batteries specially adapted for electric vehicles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/50—Charging stations characterised by energy-storage or power-generation means
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Definitions
- the present invention relates to a secondary battery in which a plurality of positive electrodes and negative electrodes are laminated via a separator, and a power feeding / storage system using the battery.
- lithium ion secondary batteries in particular, have high energy density and high capacity, so they are used as power sources for household appliances. It is also attracting attention as a storage battery for surplus power storage such as power supplies and power plants.
- a wound type lithium ion secondary battery in which a pair of belt-like positive electrode and negative electrode are spirally arranged with a separator interposed therebetween, and a plurality of sheet-like positive electrodes and sheet-like negative electrodes
- a stacked lithium ion secondary battery that is stacked through a plurality of separators.
- the electrode group composed of the plurality of sheet-like positive electrodes and sheet-like negative electrodes is enclosed in a rectangular battery can having a substantially rectangular cross section.
- a wound type lithium ion secondary battery it may be enclosed in a cylindrical battery can having a substantially circular cross section, or may be enclosed in a square battery can.
- the sheet-like positive electrode and the sheet-like negative electrode are stacked via a separator, so the positions of the positive electrode and the negative electrode are misaligned in the square battery can. In other words, stacking misalignment may occur.
- this misalignment occurs, there is a risk of failure such as a short circuit in the battery due to contact between the positive electrode and the negative electrode.
- the rectangular battery can is a conductor, it is necessary to insulate it from the positive electrode and the negative electrode. Therefore, a proposal has been made to provide an auxiliary sheet made of polypropylene, which is insulative, on both end faces of the electrode group and to fix the tape together with the electrode group (see Patent Document 1 below). JP 2008-91099 A
- FIG. 8 shows a cross section of the rectangular battery can 1 cut along a plane parallel to the plane on which the positive electrode terminal and the negative electrode terminal (not shown) are formed.
- An electrode group in which a sheet-like positive electrode 2 electrically connected to a positive electrode terminal via a positive electrode tab and a negative electrode 3 electrically connected to a negative electrode terminal via a negative electrode tab are stacked via a separator (not shown) It is inserted into the prismatic battery can 1.
- the positive electrode 2 and the negative electrode 3 are laminated so that their surfaces are orthogonal to the surface on which the positive electrode terminal and the negative electrode terminal are formed, that is, the direction along the surface is the lamination direction.
- auxiliary sheets 4 and 5 made of polypropylene are disposed as shown in the four corners of the electrode group.
- the electrode surface width a is the same dimension as the inner method (inner) b in the long side direction X of the square battery can cross section, the square battery can corner 1a is rounded so that the electrode near the corner 1a is There is a high risk of causing a failure such as a short circuit as a result of being pressed and deformed, thereby causing separator breakage and the like.
- the electrode surface width a is slightly smaller than the inner method b in the battery can cross-section long side direction X, and is designed to have a size that is not affected by the roundness of the battery can corner 1a.
- the auxiliary sheet 5 is made of a thickness that can withstand at least the insulation, in other words, an extremely thin insulator without a beam.
- the tape when used as a power source for an electric vehicle, if continuous vibration is applied to the prismatic battery can 1, the tape is used in an environment where the electrode group is immersed in an electrolyte solution even if the electrode group is fixed to the tape.
- the auxiliary sheet 5 is deformed along the shape of the rectangular battery can 1 due to the weight of the electrode group, and the positive electrode 2 and the negative electrode 3 are displaced in the plane direction as shown in FIG. A direction along the surfaces of the positive electrode 2 and the negative electrode 3, that is, a direction orthogonal to the stacking direction is generated.
- the positive electrode 2 and the negative electrode 3 at the end of the electrode group are deformed along the square battery can 1 as shown in FIG.
- the present invention can prevent electrode deformation at the corners of a rectangular battery can as much as possible even when continuous vibration is applied, and maximize performance as designed. It is an object of the present invention to provide a secondary battery and a power feeding or power storage system using the battery.
- the secondary battery of the present invention employs the following configuration. That is, a rectangular battery can provided with a positive electrode terminal and a negative electrode terminal, and a sheet-like positive electrode disposed in the rectangular battery can and electrically connected to the positive electrode terminal and electrically connected to the negative electrode terminal An electrode group in which sheet-like negative electrodes are laminated via a separator, and a cross-section in a plane in the same direction as the surface of the rectangular battery can on which the positive electrode terminal and the negative electrode terminal are formed is formed in a substantially U shape.
- the first and second insulating auxiliary sheets, and the insulating tape, the first and second insulating auxiliary sheets are arranged at positions facing each other across the electrode group, and the insulating property It is connected with a tape.
- An electric vehicle as a power feeding system includes a rectangular battery can provided with a positive electrode terminal and a negative electrode terminal, and a sheet-like shape disposed in the square battery can and electrically connected to the positive electrode terminal.
- a first insulating auxiliary sheet having a substantially U-shaped cross section, and an insulating tape, and the first and second insulating auxiliary sheets sandwich the electrode group.
- a secondary battery arranged at a position facing each other and connected by the insulating tape;
- a motor for driving the wheels, The motor is driven by receiving power from the secondary battery.
- the electric vehicle may be any vehicle that can be driven by electricity, and may be a hybrid vehicle.
- the power storage system includes a rectangular battery can provided with a positive electrode terminal and a negative electrode terminal, a sheet-like positive electrode disposed in the rectangular battery can and electrically connected to the positive electrode terminal, and the negative electrode
- the secondary battery stores power by receiving power from the power generation facility.
- any power generation equipment such as a solar battery, a fuel cell, a windmill, a thermal power generation equipment, a hydroelectric power generation equipment, and a nuclear power generation equipment may be used. Good. Even if it is not a power plant, the power generation equipment installed in a general household may be sufficient.
- the sheet-like electrodes near the corners of the square battery can are supported by one side of the U-shape formed by the insulating auxiliary sheet. It is possible to prevent deformation along. This effect can be obtained in any of a laminated type and a wound type secondary battery, for example, a laminated type lithium ion secondary battery or a wound type lithium ion secondary battery.
- the insulative auxiliary sheet does not necessarily have to be U-shaped, and two sheets of the insulative auxiliary sheet that contact at an angle of about 90 degrees support a plurality of sheet-like electrodes near the corners of the rectangular battery can. Since the above deformation can be prevented if possible, it may be a dogleg shape, a substantially square shape or a substantially rectangular shape. For the formation of these shapes, a desired mold shape may be formed from the beginning according to the mold by resin molding or the like, or a plurality of insulating auxiliary sheets are welded and fused to form a single mold. May be.
- the above shape is substantially formed. May be.
- the insulating tape has weak adhesive strength, the two surfaces of the insulating auxiliary sheet cannot sufficiently support the plurality of sheet-like electrodes near the corners of the rectangular battery can. Need to be.
- the plurality of insulating auxiliary sheets may be connected with an insulating tape.
- one mold may be formed by bending one insulating auxiliary sheet.
- auxiliary sheet In the case of bending, it is desirable to make a cut at the bent portion so that the inside of the bent corner is not rounded. It is possible to use an insulating sheet that does not have a part of the plurality of insulating auxiliary sheets, but the insulating function that supports the sheet-like electrode so that it does not enter the rounded corners of the prismatic battery can.
- the auxiliary sheet needs to be at least a material having a thickness and a thickness.
- a through hole may be provided in the insulating auxiliary sheet to provide the permeation function.
- the insulating auxiliary sheet may be increased in thickness to such an extent that deformation such as bending is difficult to form an insulating hard auxiliary plate.
- the insulating tape is made of a material that does not easily deteriorate with the electrolytic solution. It is also desirable that the adhesive for the insulating tape be a material that does not easily deteriorate with the electrolyte. Natural rubber, synthetic rubber, acrylic, vinyl alkyl ether, silicone, polyester, polyamide, urethane Adhesives such as ethylene-acrylic acid ester system, styrene-butadiene block copolymer system, and styrene-isoprene block copolymer system can be used. However, it is also possible to use a method in which a fixing tape is heat-sealed and fixed to the insulating auxiliary sheet by heating from the outside even without an adhesive surface.
- the assembled battery may be configured by connecting a plurality of the secondary batteries in series or in parallel.
- the end of the electrode group Can prevent the sheet electrode of each part from being deformed along the roundness of the corners of the square battery can, and as a result, there are few failures and the secondary battery that demonstrates the performance as designed A power storage system can be obtained.
- 1 is a cross-sectional view of a square battery can of a secondary battery according to a first embodiment of the present invention. It is tape position explanatory drawing of the secondary battery which concerns on the 1st Embodiment of this invention. It is square battery can sectional drawing of the secondary battery which concerns on the 2nd Embodiment of this invention. It is square battery can sectional drawing of the secondary battery which concerns on the 3rd Embodiment of this invention. It is tape position explanatory drawing of the secondary battery which concerns on the 3rd Embodiment of this invention. It is tape position explanatory drawing of the secondary battery which concerns on the 4th Embodiment of this invention.
- FIG. 1 is a cross-sectional view of a rectangular battery can of a laminated secondary battery according to a prerequisite technology of the present invention.
- FIG. 3 is a cross-sectional view of a square battery can of a laminated secondary battery showing the problems of the prerequisite technology of the present invention. It is an expanded sectional view of the square battery can corner of the laminated secondary battery showing the problems of the prerequisite technology of the present invention.
- Square battery can 2 Sheet-like positive electrode (sheet-like electrode) 3 Sheet-like negative electrode (sheet-like electrode) 4 Insulating auxiliary sheet 5 in the direction of the long side of the square battery can cross section 5 Insulating auxiliary sheet 6 in the direction of the short side of the square battery can cross section 7 Hollow part 7
- the member 8 in the long side direction of the square battery can cross section of the insulating auxiliary sheet
- Auxiliary sheet square battery can cross section short side member 9
- FIG. 1 shows a cross-sectional configuration of a stacked secondary battery.
- a substantially rectangular sheet-like positive electrode 2 electrically connected via a positive electrode terminal (not shown) and a positive electrode tab of the square battery can 1 and a negative electrode terminal (not shown)
- an electrode group in which a plurality of substantially rectangular sheet-like negative electrodes 3 electrically connected via negative electrode tabs are stacked via a separator (not shown), and the positive electrode terminal and the negative electrode terminal of the rectangular battery can 1 are formed.
- Two U-shaped insulating auxiliary sheets which are arranged so as to sandwich the electrode group from the long side direction of the cross section cut along the one surface provided with the positive electrode terminal and the negative electrode terminal, are inserted.
- the angle between the two sides in contact with each other is preferably about 90 degrees.
- the tape position in FIG. 1 will be described later with reference to FIG.
- the member 7 along the long side direction X of the cross section of the square battery can of the U-shaped insulating auxiliary sheet and the member 8 along the short side direction Y of the cross section of the square battery can can be manufactured inexpensively. It is desirable to form one insulating auxiliary sheet by bending. In this case, the material is the same. It is also possible to form the member 7 and the member 8 separately and to integrate them by fusing them later. In this case, the materials of both may be different.
- the member 8 needs to have sufficient strength to support the sheet-like electrode, but the member 7 is not a part that supports the sheet-like electrode. It is not always necessary to have a beam.
- the electrode surface width a is substantially the same as the width of the flat surface of the rectangular battery can 1 excluding the rounded portion of the corner 1a along the long side direction X of the cross section. It is desirable to design.
- the length d of the member 8 along the short-side direction Y of the cross-section of the rectangular battery can is a sheet-like electrode (sheet-like positive electrode 2 and sheet-like negative electrode 3; From the viewpoint of preventing bending at the corner 1a of the rectangular battery can, the internal method along the short side direction Y of the cross section of the square electrode can is f, and along the short side direction Y of the cross section of the square battery can. It is desirable to design (f ⁇ g) / 2 ⁇ d ⁇ f / 2 where g is the width dimension of the flat surface excluding the rounded portion of the corner 1a.
- the lower limit is set to prevent the member 8 from blocking the rounded portion of the corner 1a of the rectangular battery can 1 and the sheet electrodes 2 and 3 from being bent by the rounded portion as much as possible.
- the upper limit is a setting for preventing each member 8 of each U-shaped insulating auxiliary sheet from overlapping. When the overlap occurs, the angle of two sides that contact each other out of the three sides forming the U-shape is not desirable because it is shifted from about 90 degrees. However, in the case where the influence when the overlap occurs is negligibly small, the design can be made so that the overlap occurs.
- the length e of the member 7 along the long side direction X of the cross section of the rectangular battery can is substantially the same as the electrode surface width a.
- FIG. 2 shows the tape position.
- the insulating tape 10 By attaching the insulating tape 10 in two places so as to connect the two U-shaped insulating auxiliary sheets, in the enclosure connected by the two U-shaped insulating auxiliary sheets and the insulating tape 10
- the electrode group 9 is located.
- the insulating tape 10 is affixed in two places, but by winding and pasting a single tape around the electrode group 9, two U-shapes arranged in the electrode group 9 are attached.
- An insulating auxiliary sheet may be connected.
- the adhesive surface of the tape becomes large, the two U-shaped insulating auxiliary sheets can be more firmly connected to each other, and as a result, the strength of the member 8 supporting the plurality of sheet-like electrodes can be increased.
- the plurality of sheet-like electrodes near the end face of the electrode group 9 can be supported at an angle of about 90 degrees with the electrode surface by the member 8 having a beam. It is possible to effectively prevent the material from entering and deforming the round portion.
- the case of the stacked electrode group is shown, but it goes without saying that the same effect can be obtained when the wound electrode group is enclosed in a rectangular battery can.
- a lithium ion secondary battery can be targeted.
- the electrode group inserted into the rectangular battery can 1 is divided into two parts, and each electrode group 9 is sandwiched from the long side direction X of the square battery can cross section.
- Two pairs of U-shaped insulating auxiliary sheets disposed on the side.
- the dimension d is the same as that described in the first embodiment.
- the dimension d is preferably designed as (f ⁇ g) ⁇ 2 ⁇ d ⁇ f ⁇ (2 ⁇ N). This is to eliminate the overlap between the members 8 of the U-shaped insulating auxiliary sheets. However, in the case where the influence when the overlap occurs is negligibly small, the design can be made so that the overlap occurs.
- the insulating tape is attached to each of the plurality of electrode groups in the same manner as in FIG. 2 described in the first embodiment, so that the two U-shaped insulating auxiliary sheets and the insulating tape 10 are connected to each other. It is good also as a structure in which one electrode group is located inside.
- a pair of U-shaped insulating auxiliary sheets so as to sandwich each electrode group from the cross-sectional long side direction X of each of the plurality of electrode groups.
- FIGS. 4 and 5 A stacked secondary battery according to the third embodiment will be described with reference to FIGS. 4 and 5.
- members that are the same as those used in the above-described embodiment are assigned the same reference numerals, and descriptions thereof are omitted.
- the present embodiment can be implemented with appropriate modifications within a range that does not change the gist of the present invention.
- pinched from the short side direction Y of the said square battery can cross section may be inserted.
- the dimension of the member 8 along the short side direction Y is substantially the same as the internal method f along the short side direction Y of the cross section of the rectangular battery can.
- the dimension of the member 7 arranged along the long side direction X and sandwiching the electrode group 9 is set to be equal to or less than half of the electrode surface width a so that the members 7 of the U-shaped insulating auxiliary sheets do not overlap each other. Is desirable.
- the design can be made so that the overlap occurs. Except for these points, the configuration is the same as that described in the first embodiment. In this configuration, since the member 8 is a central side connecting both sides of the three U-shaped sides, all the sheet-like electrodes 2 and 3 of the electrode group 9 can be supported by the member 8. The prevention of misalignment can be strengthened as compared with the first embodiment.
- FIG. 5 shows the tape position.
- the insulating tape 10 By attaching the insulating tape 10 in two places so as to connect the two U-shaped insulating auxiliary sheets, in the enclosure connected by the two U-shaped insulating auxiliary sheets and the insulating tape 10
- the electrode group 9 is located.
- the insulating tape 10 is affixed in two places, but by winding and pasting a single tape around the electrode group 9, the two U-shapes arranged in the electrode group 9 can be obtained.
- An insulating auxiliary sheet may be connected.
- the adhesive surface of the tape becomes large, the two U-shaped insulating auxiliary sheets can be more firmly connected to each other, and as a result, the member 8 has the strength to support the plurality of sheet-like electrodes 2 and 3. Can be increased.
- one electrode group 9 is provided, but the electrode group may be divided into a plurality of pieces and inserted into the prismatic battery can 1 as in the second embodiment. In this case, it is desirable to design the dimension d of the member 8 to be substantially f / N.
- one substantially rectangular insulating auxiliary sheet disposed so as to surround the electrode group 9 when viewed from the cross section of the rectangular battery can 1 is formed in the rectangular battery can 1. Inserted into.
- a substantially rectangular shape is formed by bending one insulating auxiliary sheet at three locations and connecting one end at both ends of the insulating auxiliary sheet with the insulating tape 10.
- a substantially rectangular shape may be formed by bending one insulating auxiliary sheet at four locations and connecting one end of both ends of the insulating auxiliary sheet with the insulating tape 10.
- the dimension d of the member 8 is substantially the same as the electrode stacking width
- the dimension e of the member 7 is substantially the same as the electrode surface width. Except for these points, the configuration is the same as that described in the first embodiment. In this configuration, the electrode group 9 can be surrounded by only one insulating auxiliary sheet, so that it can be manufactured at a lower cost than other embodiments.
- one electrode group 9 is provided, but the electrode group may be divided into a plurality of pieces and inserted into the prismatic battery can 1 as in the second embodiment.
- the dimension d of the member 8 is substantially f / N.
- the secondary battery 11 mounted on the electric vehicle 12 and the spare secondary battery 15 arranged outside the house 14 are the secondary batteries according to the present invention described in any of the first to fourth embodiments described above.
- a laminated lithium ion secondary battery for example, a laminated lithium ion secondary battery.
- Electric power generated from power generation facilities 18 such as wind power generation, thermal power generation, hydroelectric power generation, nuclear power generation, solar cells, and fuel cells is supplied to a control box 16 used by a user via a supply power system 17.
- the electric power transmitted from the power generation facility 18 is supplied to any one of the secondary battery 11, the standby secondary battery 15, and the switchboard 13, which are driving power sources for the electric vehicle 12.
- the standby secondary battery 15 or the secondary battery 11 of the electric vehicle 12 is charged and stored when electric power is supplied.
- the control box may be programmed to supply power to the switchboard 13 during the day and to the secondary battery 11 of the standby secondary battery 15 or the electric vehicle 12 at night.
- the spare secondary battery 15 charged by the power storage system is electrically connected to the switchboard 13 in the house 14 via the control box 16.
- the switchboard 13 is electrically connected to electrical appliances such as air conditioners and televisions connected to plugs in the house 14.
- the user can select whether to drive the electrical appliance in the house 14 by receiving power from the power feeding power system 17 or to drive the electrical appliance using the power of the standby secondary battery 15 stored by the power storage system, This selection / switching is performed by the control box 16.
- the backup secondary battery 15 is electrically connected to the switchboard 13 by switching in the control box 16, power is supplied from the backup secondary battery 15 to the switchboard 13 so that the electrical appliance can be driven.
- the electric vehicle 12 can run by supplying power to the motor that drives the wheels from the secondary battery 11 stored by the power storage system.
- the electric vehicle 12 may be a vehicle capable of driving wheels with an electric motor, and may be a hybrid vehicle.
- the power storage / power supply system using the secondary battery according to the present invention it is possible to prevent as much as possible the stacking deviation and the electrode bending at the corner of the rectangular battery can due to the vibration that is a cause of failure in the secondary battery.
- a power supply system in a car with a lot of vibrations and a power supply / storage system in an earthquake-prone country stable operation with few failures is possible.
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Abstract
Description
リチウムイオン二次電池の形態としては、一対の帯状の正極電極と負極電極とをセパレータを介して渦巻状とした巻回型リチウムイオン二次電池と、複数のシート状正極とシート状負極とを複数のセパレータを介して積層した積層型リチウムイオン二次電池がある。
積層型リチウムイオン二次電池では、上記複数のシート状正極とシート状負極とからなる電極群は、断面が略長方形の角型の電池缶に封入される。巻回型リチウムイオン二次電池では、断面が略円形の円筒型の電池缶に封入される場合もあれば、角型電池缶に封入される場合もある。
また、角型電池缶1には電解液を蓄える必要があるため、電極群と角型電池缶1との間には一定の空間を設けなければならない。このため補助シート5は絶縁に最低限耐えられる程度の厚み、言い換えれば極めて薄くはりのない絶縁体が用いられる。
すなわち、正極端子および負極端子が設けられた角型電池缶と、前記角型電池缶内に配置され、前記正極端子に電気的に接続されたシート状正極及び前記負極端子に電気的に接続されたシート状負極がセパレータを介して積層された電極群と、前記正極端子および前記負極端子が形成された前記角型電池缶の面と同一方向の面での断面が略コの字型に形成された第1および第2の絶縁性補助シートと、絶縁性テープとを有し、前記第1及び第2の絶縁性補助シートは前記電極群を挟んで対向する位置に配置され且つ前記絶縁性テープで連結されていることを特徴とする。
車輪を駆動するモーターとを有し、
前記モーターは前記二次電池から給電を受けて駆動することを特徴とする。
電気自動車としては、電気で駆動可能な自動車であればよく、ハイブリッド自動車でもよい。
発電設備とを有し、
前記二次電池は前記発電設備から給電を受けて蓄電することを特徴とする。
発電設備としては、太陽電池、燃料電池、風車、火力発電設備、水力発電設備、原子力発電設備など、発電を行う設備であればいずれのものでもよく、自動車、自転車などに備えられる単なる発電機でもよい。発電所でなくとも、一般家庭に設置される発電設備でもよい。
これらの形状の形成には、樹脂成型等で型に合わせて初めから所望の型形状に形成してもよく、または複数の絶縁性補助シートを溶着、融着等して1つの型を形成してもよい。
電極群の角部で約90度になるように2つの絶縁性補助シートを配置し、電極群の角の形状に沿ってこれらを絶縁性テープで連結することによって、実質的に上記形状を形成してもよい。この場合には、絶縁性テープの粘着力が弱くては絶縁性補助シートの2面で角型電池缶角部付近の複数のシート状電極を十分に支えることができないので、上記粘着力が強力である必要がある。
複数の絶縁性補助シートの一部が互いに重なった状態で、これら複数の絶縁性補助シート同士が絶縁性テープで連結されてもよい。
また、1つの絶縁性補助シートを折り曲げて1つの型を形成してもよい。折り曲げる場合には、折り曲げた角部の内側が丸まらないように、折り曲げる箇所に切れ込みを入れるのが望ましい。
複数の絶縁性補助シートの一部ははりのない絶縁性シートを用いることも可能であるが、シート状電極が上記角型電池缶の角の丸み部分に進入しないように支える役割を担う絶縁性補助シートははりのある材料、厚みであることが少なくとも必要である。
また、電極群へ十分に電解液を浸透させるために、絶縁性補助シートそれ自体に電解液を浸透させる機能があるものが望ましい。絶縁性補助シートに貫通穴を設けて当該浸透機能をもたせてもよい。
角型電池缶断面短辺方向に配置される絶縁性補助シートの幅を、角型電池缶断面短辺内法と実質的に同一寸法幅とすることで、振動により電極群から絶縁性補助シートに圧力が加えられた場合にも、絶縁性補助シートを角型電池缶の両角部にひっかけることができる。これにより、シート状電極の角型電池缶角部丸み部分への侵入をより強固に防止できる。絶縁性硬質補助板を使用すれば、さらに強固に防止できる。
2 シート状正極(シート状電極)
3 シート状負極(シート状電極)
4 角型電池缶断面長辺方向の絶縁性補助シート
5 角型電池缶断面短辺方向の絶縁性補助シート
6 中空部分
7 絶縁性補助シートの角型電池缶断面長辺方向の部材
8 絶縁性補助シートの角型電池缶断面短辺方向の部材
9 電極群
10 絶縁性テープ
11 二次電池
12 電気自動車
13 配電盤
14 家屋
15 予備の二次電池
16 制御ボックス
17 給電電力系統
18 発電設備
以下に、本発明の第1の実施形態に係る二次電池について、図面を参照して説明する。本発明は以下の最良の形態に限定されるものでなく、本発明の要旨を変更しない範囲内で適宜変更して実施できる。
コの字型絶縁性補助シートの上記角型電池缶断面の長辺方向Xに沿う部材7と上記角型電池缶断面の短辺方向Yに沿う部材8は、安価に製造できる点ではりのある1つの絶縁性補助シートを折り曲げて形成するのが望ましい。この場合、材質は同一となる。
部材7と部材8とを別個に形成し、後に両者を融着等して一体化することも可能であり、この場合には両者の材質が異なってもよい。シート状電極の角型電池缶角部における折り曲げを防止する観点から、部材8はシート状電極を支えるのに充分な強度を有する必要があるが、部材7はシート状電極を支える部位ではないため必ずしもはりのある必要はない。
角型電池缶1内の中空部分6には電解液が蓄えられるが、この中空部分6の上記角型電池缶断面の長辺方向Xに沿う長さcは、上記角型電池缶断面の長辺方向内法をbとすると、c=(b-a)÷2となる。電解液を充分に蓄えられるよう角の丸みを調整してcの値が設計される。
部材7の上記角型電池缶断面の長辺方向Xに沿う長さeは、実質的に電極面幅aと同一になる。
図2では絶縁性テープ10は2箇所に貼られているが、電極群9の周囲に1本のテープを切れ目なく巻いて貼ることで、当該電極群9に配置された2つのコの字型絶縁性補助シートを連結してもよい。この場合には、テープの接着面が大きくなることから、より強固に2つのコの字型絶縁性補助シート同士を連結でき、結果として部材8が複数のシート状電極を支える強度を増すことができる。
本構成によれば、電極群9の端面付近の複数のシート状電極をはりのある部材8によって電極面と約90度の角度で支えることができるので、電極シートが角型電池缶1の角の丸み部分に進入して変形することを効果的に防ぐことができる。
第2の実施形態に係る積層型二次電池について、図3を参照して説明する。この実施形態において、前述した実施形態で用いた部材と共通の部材には同一の符号を付して、その説明を省略する。また、本実施形態は、本発明の要旨を変更しない範囲内で適宜変更して実施できる。
この場合、寸法dは、(f-g)/2 ≦d≦f/4と設計するのが望ましい。これらの点以外は、上記第1の実施形態で述べたと同様である。
さらに電極群を分割することも可能であり、例えば電極群をN分割(Nは整数)する場合は、N対のコの字型絶縁性補助シートでそれぞれの電極群を挟み込むが、この場合の寸法dは、(f-g)÷2≦d≦f÷(2×N)と設計するのが望ましい。各コの字型絶縁性補助シートの部材8同士の重なりをなくすためである。ただし、当該重なりが生じた場合の影響が無視できる程度に軽微な場合には、当該重なりが生じるように設計されうる。
第3の実施形態に係る積層型二次電池について、図4、図5を参照して説明する。この実施形態において、前述した実施形態で用いた部材と共通の部材には同一の符号を付して、その説明を省略する。また、本実施形態は、本発明の要旨を変更しない範囲内で適宜変更して実施できる。
本構成では、部材8がコの字の3辺のうち両端の辺を繋ぐ中央の辺となることで、電極群9の全てのシート状電極2、3を部材8で支えることができ、上述の第1の実施形態よりも、積層ずれ防止を強化することができる。
図5では絶縁性テープ10は2箇所に貼られているが、電極群9の周囲に1本のテープを切れ目なく巻いて貼ることで、当該電極群9に配置された2つのコの字型絶縁性補助シートを連結してもよい。この場合には、テープの接着面が大きくなることから、より強固に2つのコの字型絶縁性補助シート同士を連結でき、結果として部材8が複数のシート状電極2、3を支える強度を増すことができる。
第4の実施形態に係る積層型二次電池について、図6を参照して説明する。この実施形態において、前述した実施形態で用いた部材と共通の部材には同一の符号を付して、その説明を省略する。また、本実施形態は、本発明の要旨を変更しない範囲内で適宜変更して実施できる。
本構成では、1つの絶縁性補助シートだけで電極群9を取り囲むことができるので、他の実施形態に比べ安価に製造ができる。
第5の実施形態に係る二次電池を利用した蓄電・給電システムについて、図7を参照して説明する。この実施形態において、前述した実施形態で用いた部材と共通の部材には同一の符号を付して、その説明を省略する。また、本発明は以下の実施形態に限定されるものでなく、本発明の要旨を変更しない範囲内で適宜変更して実施できる。
昼間は配電盤13、夜間は予備二次電池15または電気自動車12の二次電池11へ電力供給するように制御ボックスをプログラム制御してもよい。
制御ボックス16における切り替えにより、予備二次電池15が配電盤13に電気的に接続された場合には、予備二次電池15から配電盤13へ給電され、上記電化製品の駆動が可能となる。
Claims (8)
- 正極端子および負極端子が設けられた角型電池缶と、
前記角型電池缶内に配置され、前記正極端子に電気的に接続されたシート状正極及び前記負極端子に電気的に接続されたシート状負極がセパレータを介して積層された電極群と、
前記正極端子および前記負極端子が形成された前記角型電池缶の面と同一方向の面での断面が略コの字型に形成された第1および第2の絶縁性補助シートと、
絶縁性テープとを有し、
前記第1及び第2の絶縁性補助シートは前記電極群を挟んで対向する位置に配置され且つ前記絶縁性テープで連結されていることを特徴とする二次電池。 - 前記第1および第2の絶縁性補助シートは、それぞれ1つのシート状部材の端部を折り曲げることで前記略コの字型に形成されることを特徴とする請求項1に記載の二次電池。
- 正極端子および負極端子が設けられた角型電池缶と、
前記角型電池缶内に配置され、前記正極端子に電気的に接続されたシート状正極及び前記負極端子に電気的に接続されたシート状負極がセパレータを介して積層された電極群と、
前記正極端子および前記負極端子が形成された前記角型電池缶の面と同一方向の面での断面の短辺方向の前記電極群の幅と略同一の幅寸法または前記電極群の幅より小さい幅寸法を有し、前記短辺方向から前記電極群を挟んで対向する位置にそれぞれ配置された第1および第2の絶縁性補助シートと、
前記断面の長辺方向の前記電極群の幅と略同一の幅または前記電極群の幅より小さい幅寸法を有し、前記長辺方向から前記電極群を挟んで対向する位置にそれぞれ配置された第3および第4の絶縁性補助シートと、
絶縁性テープとを有し、
前記第1、第2、第3および第4の絶縁性補助シート並びに前記絶縁性テープで連結された囲いの中に前記電極群が位置することを特徴とする二次電池。 - 前記第3および第4の絶縁性補助シートは少なくともそれぞれ第1部分および第2部分に分割され、前記第3および第4の絶縁性補助シートの各第1部分は前記第1の絶縁性補助シートと一体化しており、前記第3および第4の絶縁性補助シートの各第2部分は前記第2の絶縁性補助シートと一体化していることを特徴とする請求項3に記載の二次電池。
- 前記第1および第2の絶縁性補助シートは少なくともそれぞれ第1部分および第2部分に分割され、前記第1および第2の絶縁性補助シートの各第1部分は前記第3の絶縁性補助シートと一体化しており、前記第1および第2の絶縁性補助シートの各第2部分は前記第4の絶縁性補助シートと一体化していることを特徴とする請求項3に記載の二次電池。
- 前記第1、第2、第3および第4の絶縁性補助シートは1つのシート状に一体化されていることを特徴とする請求項3に記載の二次電池。
- 正極端子および負極端子が設けられた角型電池缶と、前記角型電池缶内に配置され、前記正極端子に電気的に接続されたシート状正極及び前記負極端子に電気的に接続されたシート状負極がセパレータを介して積層された電極群と、前記正極端子および前記負極端子が形成された前記角型電池缶の面と同一方向の面での断面が略コの字型に形成された第1および第2の絶縁性補助シートと、絶縁性テープとを有し、前記第1及び第2の絶縁性補助シートは前記電極群を挟んで対向する位置に配置され且つ前記絶縁性テープで連結されている二次電池と、
車輪を駆動するモーターとを有し、
前記モーターは前記二次電池から給電を受けて駆動することを特徴とする電気自動車。 - 正極端子および負極端子が設けられた角型電池缶と、前記角型電池缶内に配置され、前記正極端子に電気的に接続されたシート状正極及び前記負極端子に電気的に接続されたシート状負極がセパレータを介して積層された電極群と、前記正極端子および前記負極端子が形成された前記角型電池缶の面と同一方向の面での断面が略コの字型に形成された第1および第2の絶縁性補助シートと、絶縁性テープとを有し、前記第1及び第2の絶縁性補助シートは前記電極群を挟んで対向する位置に配置され且つ前記絶縁性テープで連結されている二次電池と、
発電設備とを有し、
前記二次電池は前記発電設備から給電を受けて蓄電することを特徴とする蓄電システム。
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- 2009-03-31 WO PCT/JP2009/056648 patent/WO2010113254A1/ja active Application Filing
- 2009-03-31 CN CN2009801189677A patent/CN102047489A/zh active Pending
- 2009-03-31 US US13/124,734 patent/US20110244319A1/en not_active Abandoned
- 2009-03-31 JP JP2010539645A patent/JP5506692B2/ja not_active Expired - Fee Related
- 2009-03-31 KR KR1020107026398A patent/KR101345446B1/ko not_active IP Right Cessation
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JP2013515352A (ja) * | 2011-01-06 | 2013-05-02 | エルジー・ケム・リミテッド | セルのサイドテープ自動付着方法及び装置 |
US8802283B2 (en) | 2012-01-19 | 2014-08-12 | Samsung Sdi Co., Ltd. | Fabricating method of secondary battery |
WO2013154155A1 (ja) * | 2012-04-13 | 2013-10-17 | 株式会社 豊田自動織機 | 蓄電装置及び二次電池 |
JP2013235818A (ja) * | 2012-04-13 | 2013-11-21 | Toyota Industries Corp | 蓄電装置及び二次電池 |
US9905826B2 (en) | 2012-04-13 | 2018-02-27 | Kabushiki Kaisha Toyota Jidoshokki | Electric storage device and rechargeable battery |
JP2014011115A (ja) * | 2012-07-02 | 2014-01-20 | Toyota Industries Corp | 蓄電装置 |
Also Published As
Publication number | Publication date |
---|---|
EP2416432A1 (en) | 2012-02-08 |
CN102047489A (zh) | 2011-05-04 |
KR20110005891A (ko) | 2011-01-19 |
JP5506692B2 (ja) | 2014-05-28 |
US20110244319A1 (en) | 2011-10-06 |
JPWO2010113254A1 (ja) | 2012-10-04 |
KR101345446B1 (ko) | 2013-12-27 |
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