WO2010050402A1 - 二次電池およびその製造方法 - Google Patents
二次電池およびその製造方法 Download PDFInfo
- Publication number
- WO2010050402A1 WO2010050402A1 PCT/JP2009/068201 JP2009068201W WO2010050402A1 WO 2010050402 A1 WO2010050402 A1 WO 2010050402A1 JP 2009068201 W JP2009068201 W JP 2009068201W WO 2010050402 A1 WO2010050402 A1 WO 2010050402A1
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- WO
- WIPO (PCT)
- Prior art keywords
- battery
- negative electrode
- positive
- element group
- power generation
- Prior art date
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Images
Classifications
-
- 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
- H01M4/64—Carriers or collectors
- H01M4/70—Carriers or collectors characterised by shape or form
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
-
- 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
-
- 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
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49108—Electric battery cell making
Definitions
- the present invention relates to a secondary battery and a manufacturing method thereof, and in particular, is defined by a battery can in a rectangular parallelepiped shape, a battery lid that seals the opening of the battery can, a battery can, and a battery lid.
- the present invention relates to a secondary battery provided with a power generation element group having positive and negative electrode plates disposed in a space and a method for manufacturing the same.
- the structure of the secondary battery for driving a vehicle is that a sheet for both positive and negative electrodes (positive and negative electrode plates), a separator for insulation between the positive and negative electrode plates, and an electrolytic solution are sealed with metal or resin.
- a device provided with an external terminal housed in a container and joined to both electrodes of a power generation element is widely known.
- Most secondary batteries that have been put to practical use have a cylindrical outer shape.
- Conventionally known prismatic secondary batteries usually have an uncoated portion of a positive and negative electrode mixture formed at both ends of a power generation element group, and a connection plate is joined to each of the uncoated portions.
- the shape of the connection plate is limited by the shape of the power generation element group and the battery can, and the current path length is increased, and the current path width is inevitably reduced. Since the electrical resistance is proportional to the current path length and inversely proportional to the current path width, the secondary battery has a problem that (1) it is difficult to reduce the internal resistance of the battery.
- the battery can is produced by a deep drawing method in which the battery can is gradually formed by being divided into many processes, the die cost and the manufacturing cost are increased. That is, in the secondary battery 70, (2) the battery outer shape is enlarged, (3) it is difficult to accommodate the power generation element group 46 in the battery can 41, and (4) the battery can 41 is expensive. is there.
- Patent Document 1 there is a technique in which a relatively shallow battery can with a large opening and a small size in the DH direction is used and sealed with a flat battery lid. It is disclosed (for example, see Patent Document 1).
- the technique of Patent Document 1 has the following problems because the positive and negative terminals are respectively arranged on the battery lid.
- the positive and negative terminals are respectively arranged on the battery lid.
- each secondary battery is generally arranged in the DH direction, and the interval between adjacent batteries is limited to about several mm from the viewpoint of mounting density.
- the positive and negative terminals arranged on the battery lid are hidden between adjacent secondary batteries, and it is physically difficult to connect the secondary batteries.
- the secondary battery of Patent Document 1 has a problem that (5) it is difficult to make an assembled battery. In order to avoid this, it is necessary to extend the positive and negative terminals to the outside of the outline of the battery can in the WH direction or the HH direction, respectively.
- a laser beam or electron beam is irradiated from the upper side of the battery lid during welding of the battery can and the battery lid, the beam passes directly above the positive and negative electrode terminals, and welding between the battery can and the battery lid directly below is performed. It becomes impossible to do.
- an object of the present invention is to provide a secondary battery with reduced internal resistance.
- a first aspect of the present invention is a shallow bottomed rectangular parallelepiped shape, and the length of one side perpendicular to the bottom of the shallow bottomed rectangular parallelepiped is the length of the other two sides.
- the through-hole is formed in the both end part side of a bottom, and the battery is connected to a negative electrode plate through a through-hole connected to the negative electrode plate through the through-hole and connected to the positive electrode plate.
- the connection member that is electrically connected to the outside may extend in opposite directions.
- the battery can has an offset surface located closer to the battery lid than the bottom surface in the vicinity of two opposing sides of the four sides constituting the outer periphery of the bottom, and a through hole is formed in the offset surface. It may be.
- the battery can has a plurality of through holes formed on the offset surface, and the connection member is electrically and mechanically connected to the uncoated portion of the positive and negative electrode plates through each of the through holes.
- the connecting member has a connecting portion electrically and mechanically connected to the uncoated portion of the positive and negative electrode plates, and an extending portion formed integrally with the connecting portion and extending to the outside of the battery can.
- the extending portion may be bent along the outer bottom of the battery can and one side orthogonal to the bottom, and one end portion may extend toward the battery lid.
- the battery can may have a safety valve for releasing the internal pressure when the battery internal pressure rises on a side surface adjacent to any one side other than the two sides where the through holes are formed in the vicinity.
- the battery lid may be welded to the opening of the battery can, with the outline matching the outline of the member forming the opening of the battery can.
- the connecting member is connected to the bottom surface of the battery can of the uncoated portion on one side, and the protruding end surface has a flat protruding portion on one side, and the other side is led out to the outside.
- the projecting end surface of the external terminal may be joined to the other surface side of the connection plate via the through hole of the battery can.
- the connection member is composed of a flat external terminal and a cup-shaped connection terminal fixed to the external terminal, and the cup outer bottom surface of the connection terminal is joined to the uncoated part through the through hole of the battery can. It may be.
- the battery can and the battery lid can be made of aluminum or aluminum alloy.
- a resin plate material disposed between the power generation element group and the battery lid and between the power generation element group and the battery can may be further provided.
- the resin plate material disposed between the power generation element group and the battery can may have a notch formed at a position corresponding to the through hole of the battery can.
- the resin plate material disposed between the power generation element group and the battery lid may have a notch formed on at least one side constituting the outer periphery.
- the 2nd aspect of this invention is a manufacturing method of the secondary battery of a 1st aspect, Comprising: An insulating member is interposed in the through-hole of the said battery can, The said connection member A fixing step of fixing the power generation element group in the battery can, a connection step of electrically and mechanically connecting the connection member and an uncoated portion of the positive and negative electrode plates, and the battery Joining a can and a battery lid.
- the connecting step it is preferable to place the power generating element group so as to be positioned on the inner side so that the uncoated portions of the positive and negative electrode plates respectively face the formation surface of the through hole of the battery can.
- the uncoated portions of the positive and negative electrode plates constituting the power generation element group are located on the inner side so as to face the formation surface of the through hole of the battery can, and are connected to the uncoated portions, respectively. Since the member is conducted to the outside of the battery through the through-hole, the current path from the power generation element group to the outside of the battery can be shortened, the internal resistance can be reduced, and the inside of the battery can can be made compact to reduce the size of the battery. The effect that it can plan can be acquired.
- FIG. 1 (A) is the perspective view seen from the battery cover direction
- FIG.1 (B) is the perspective view seen from the battery can bottom direction.
- FIG. 2 is a perspective view showing the secondary battery of the embodiment and showing a QQ cross section of FIG.
- FIG. 4A is a perspective view of a form in which the positive and negative electrode plates are wound
- FIG. 4B is a form in which the positive and negative electrode plates are laminated.
- a lithium ion secondary battery 30 of the present embodiment includes a battery can 1 having an opening that is entirely open, and a battery lid 3 that seals the opening of the battery can 1. It has. In a space defined by the battery can 1 and the battery lid 3, a power generation element group in which the positive and negative electrode plates are wound is disposed so as to be infiltrated with the electrolytic solution.
- the battery can 1 is formed so that the length of the other one side orthogonal to the two sides is smaller than the length of any two sides orthogonal to the four sides constituting the outer periphery of the opening.
- the battery can 1 is formed in a shallow cuboid shape with a shallow shape in which one side perpendicular to the bottom is shorter than the other two sides.
- aluminum is used as the material of the battery can 1.
- a positive electrode terminal 4A and a negative electrode terminal 4B are disposed on two side surfaces (left and right sides in FIG. 1A) that are orthogonal to the bottom surface of the battery can 1 and face each other.
- the battery can 1 has a fragile portion (safety valve) for automatically cleaving and releasing the internal pressure in one of the side surfaces where the positive electrode terminal 4A and the negative electrode terminal 4B are not arranged in the event of an unexpected increase in the internal pressure of the battery. ), And a cylindrical protective member 21 is disposed in the portion where the fragile portion is formed.
- the battery lid 3 is formed in a flat plate shape whose outline matches the outline of the portion where the opening of the battery can 1 is formed. In the battery lid 3, the unevenness in the thickness direction is formed smaller than the unevenness of the battery can 1.
- the battery lid 3 is formed with a liquid injection port for injecting an electrolytic solution, and the liquid injection port is sealed with a liquid injection plug 22. In this example, aluminum is used as the material of the battery lid 3.
- the battery can 1 has offset surfaces 11 formed at substantially central portions of the two sides in the vicinity of two opposite sides of the four sides constituting the outer periphery of the bottom surface 1A.
- the offset surface 11 is located closer to the battery lid 3 than the bottom surface 1A. That is, the distance between the offset surface 11 and the battery lid 3 is smaller than the distance between the bottom surface 1 ⁇ / b> A and the battery lid 3.
- the bottom surface 1A has depressions formed in the vicinity of two opposing sides.
- the offset surface 11 is formed with a through hole at a substantially central portion.
- the through holes are formed at both ends of the bottom of the battery can 1 and are formed in an oval shape along the side in the vicinity, that is, the outer edge of the bottom surface 1A.
- Both of the positive electrode terminal 4A and the negative electrode terminal 4B have a wide shape, and the other side of each extends from the bottom surface 1A (offset surface 11) to the side surface of the battery can 1 via the seal 13. That is, the positive electrode terminal 4A and the negative electrode terminal 4B extend in the side surface direction starting from the offset surface 11 of the battery can 1, and bend at the outer edge of the bottom surface 1A and extend in the direction of the battery lid 3. Further, the end of the battery can 1 is bent again at the position on the side surface of the battery can 1 and extends outward from the outer shell of the battery can 1.
- the three-dimensional three directions in the lithium ion secondary battery 30 are defined as follows. That is, the direction connecting the positive terminal 4A and the negative terminal 4B of the battery can 1 is the WH direction, the thickness direction connecting the bottom surface 1A of the battery can 1 and the battery cover 3 is the DH direction, and the direction orthogonal to the WH direction and the DH direction. Is the HH direction.
- a power generation element group 6 is disposed in a space defined by the battery can 1 and the battery lid 3.
- positive and negative electrode plates are wound in a flat shape (in the shape of an ellipse in cross section).
- the uncoated portions 6A and 6B of the active material mixture of the positive and negative electrode plates are exposed at both opposing ends of the power generating element group 6 (both sides in the WH direction). That is, the uncoated portions 6A and 6B of the positive and negative electrode plates are arranged on the opposite sides.
- the substantially central portion in the HH direction is pressed into a flat shape.
- both sides in the HH direction and the coating portion side of the active material mixture of the positive and negative electrode plates are formed in an inclined shape.
- Connection plates 5A and 5B (parts of connection members) for connecting to the positive terminal 4A and the negative terminal 4B are arranged on the battery can 1 side of the uncoated portions 6A and 6B, respectively.
- the connecting plates 5A and 5B are flat plate-like members bent in an L-shaped cross section, and are arranged so as to extend from the uncoated portions 6A and 6B to the inclined surface on the coated portion side of the positive and negative plates.
- bonding plates 23A and 23B for maintaining the flatness of the uncoated portions 6A and 6B at the time of bonding to the connection plates 5A and 5B are arranged, respectively. ing.
- the joining plates 23A and 23B are flat plate-like members bent into an L-shaped cross section, and are arranged so as to extend from the uncoated portions 6A and 6B to the inclined surface on the coated portion side of the positive and negative plates.
- the connection plates 5A and 5B are arranged on the battery can 1 side, respectively, and the joining plates 23A and 23B are arranged on the battery lid 3 side, respectively.
- the uncoated portion 6A is sandwiched between the connection plate 5A and the joining plate 23A, and is mechanically and electrically joined by, for example, ultrasonic joining.
- the uncoated part 6B is sandwiched between the connection plate 5B and the joining plate 23B and joined in the same manner as the uncoated part 6A side. That is, the uncoated portions 6A and 6B are joined on the one surface side to the one surface side of the connection plates 5A and 5B, respectively.
- aluminum is used as the material of the connecting plate 5A and the joining plate 23A
- copper is used as the material of the connecting plate 5B and the joining plate 23B.
- the seal 13 is made of, for example, a resin such as polyphenylene sulfide (PPS) or polybutylene terephthalate (PBT), and a rectangular flat plate member is bent into an L-shaped cross section.
- PPS polyphenylene sulfide
- PBT polybutylene terephthalate
- the seal 13 has a through-hole having the same shape as the through-hole 1B on one side, and has a ring-shaped protrusion that can be inserted into the through-hole 1B at the peripheral edge of the through-hole.
- a groove is formed in which the inner peripheral side end of the through hole 1B can be inserted. That is, the inner peripheral end of the through hole 1 ⁇ / b> B is inserted into the groove of the ring-shaped protrusion, and the seal 13 is fixed to the battery can 1.
- the battery lid 3 is formed with a liquid injection port 20 for injecting an electrolytic solution at a substantially central portion of the end on one side in the WH direction.
- the liquid injection port 20 is sealed with a liquid injection plug 22.
- a resin-made plate-like insulating case 7 A (resin plate material) is disposed, and between the power generation element group 6 and the battery cover 3, a resin plate An insulating case 7B (resin plate material) is disposed. That is, the insulating cases 7A and 7B are disposed on both sides of the power generation element group 6 in the DH direction.
- Cutouts are formed in the insulating case 7 ⁇ / b> A at positions corresponding to the through holes 1 ⁇ / b> B of the battery can 1 at the substantially central portions (both sides in the WH direction) of the two opposing sides.
- the notches are formed in substantially the same shape as the pressed portions of the uncoated portions 6A and 6B of the positive and negative electrode plates.
- the insulating case 7B is formed in the same shape as the insulating case 7A, and a notch is formed in each of the substantially central portions on both sides in the WH direction.
- One notch formed in the insulating case 7 ⁇ / b> B is formed at a position corresponding to the liquid injection port 20.
- the ends on both sides in the HH direction are curved toward the power generation element group 6 side so as to match the shape of the power generation element group 6. For this reason, the curved edges on both sides in the HH direction of the insulating case 7A come into contact with the curved edges on both sides in the HH direction of the insulating case 7B, and the insulating cases 7A and 7B are pressed against each other in the DH direction.
- the insulating cases 7A and 7B are formed in an inclined shape so as to match the shapes of the uncoated portions 6A and 6B of the power generation element group 6, respectively.
- the power generation element group 6 is disposed in a space defined by the battery can 1 and the battery lid 3 while being sandwiched between the insulating cases 7A and 7B.
- the insulating cases 7A and 7B function to secure insulation between the power generation element group 6 and the battery can 1 and the battery lid 3 and relieve external stress on the power generation element group 6 when an external force is applied.
- a resin such as polyethylene terephthalate (PET) or polypropylene (PP) can be used as a material of the insulating cases 7A and 7B.
- the positive electrode terminal 4A and the negative electrode terminal 4B are made of the same material as the current collector foil constituting the positive electrode plate and the negative electrode plate, respectively, and a wide rectangular member is bent into an L-shaped cross section.
- the positive electrode terminal 4A is made of aluminum
- the negative electrode terminal 4B is made of copper.
- Each of the positive terminal 4A and the negative terminal 4B has a protruding portion T having the same shape as the through hole 1B on one side.
- the protruding portion T has a protruding end surface formed in a flat shape.
- the protrusion part T is each inserted in the through-hole 1B via the seal
- the projecting end surfaces of the projecting portions T are mechanically and electrically connected to the other surfaces of the connection plates 5A and 5B, for example, by laser welding.
- connection form between the power generation element group 6 and the positive electrode terminal 4A and the negative electrode terminal 4B will be described. Since both the positive electrode side and the negative electrode side are formed in the same manner, only the positive electrode side will be described.
- a bonding plate 23A is bonded to the battery lid 3 side of the uncoated portion 6A of the positive electrode plate, and a connection plate 5A (one surface side) is bonded to the bottom surface 1A side (one surface side).
- Insulating cases 7A and 7B are arranged between the power generation element group 6, the battery can 1 and the battery lid 3, respectively.
- An offset surface 11 is formed at the end of the bottom surface 1A on the one side in the WH direction so as to extend along the outer edge of the bottom surface 1A.
- a through hole 1 ⁇ / b> B is formed in a substantially central portion of the offset surface 11.
- a positive electrode terminal 4 ⁇ / b> A is inserted into the through hole 1 ⁇ / b> B via a seal 13.
- the protruding end surface of the protruding portion T of the positive electrode terminal 4A is joined to the connection plate 5A (the other surface side). That is, in this example, the positive electrode terminal 4A and the connection plate 5A are electrically and mechanically connected to the uncoated portion 6A, and constitute a connection member 9A for conducting with the outside of the battery through the through hole 1B. (It corresponds to the connecting member 9B on the negative electrode side).
- a connecting portion 9Aa electrically and mechanically connected to the uncoated portion 6A, and an extending portion 9Ab formed integrally with the connecting portion 9Aa and extending to the outside of the battery can 1 are provided.
- the connecting portion 9Aa is composed of a connecting plate 5A and a portion on one side including the protruding portion T of the positive electrode terminal 4A, and the extending portion 9Ab is composed of a portion on the other side of the positive electrode terminal 4A.
- the extending portion 9Ab is bent at the outer edge of the bottom surface 1A along the bottom surface 1A of the battery can 1 and the side surface adjacent to the bottom surface 1A, and one end portion extends to the battery lid 3 side.
- a portion of the extending portion 9Ab located on the side surface of the battery can 1 is bent at a substantially central portion in the HH direction, and the bent portion extends outward from the outline of the battery can 1, that is, outward in the WH direction. Since the negative electrode side is formed similarly to the positive electrode side, the positive electrode terminal 4A and the negative electrode terminal 4B (the connecting member 9A and the connecting member 9B) extend in opposite directions.
- a mating portion 24 that is thinned to a depth corresponding to the thickness of the battery lid 3 is formed. That is, the opening of the battery can 1 has a step at a depth corresponding to the thickness of the battery lid 3.
- the battery lid 3 is fitted to the mating portion 24 of the battery can 1.
- the entire periphery of the battery lid 3 is welded to the mating portion 24.
- the power generation element group 6 is formed by winding and arranging a positive electrode plate and a negative electrode plate with a separator interposed therebetween. As shown in FIG. 4A, in the wound-type power generation element group 6, a strip-shaped positive electrode plate 6E and a strip-shaped negative electrode plate 6D are wound through two strip-shaped separators 6C. . At this time, the uncoated portion 6 ⁇ / b> A of the positive electrode plate 6 ⁇ / b> E and the uncoated portion 6 ⁇ / b> B of the negative electrode plate 6 ⁇ / b> D are wound in an elliptical cross section so as to be positioned on both end faces of the power generation element group 6. In the power generation element group 6 to be obtained, the uncoated portions 6A and 6B are arranged on the opposite sides in the WH direction.
- the positive electrode plate 6E constituting the power generation element group 6 has an aluminum foil as a positive electrode current collector foil.
- a positive electrode active material mixture containing a lithium-containing transition metal double oxide such as lithium manganate as a positive electrode active material is applied to both surfaces of the aluminum foil substantially uniformly and substantially uniformly.
- the positive electrode active material mixture contains a conductive material such as a carbon material and a binder (binder) such as polyvinylidene fluoride (hereinafter abbreviated as PVDF).
- a dispersion solvent such as N-methylpyrrolidone (hereinafter abbreviated as NMP).
- the uncoated part 6A where the positive electrode active material mixture is not coated is formed on the side edge on one side in the longitudinal direction of the aluminum foil. That is, the aluminum foil is exposed in the uncoated portion 6A.
- the density of the positive electrode plate 6E is adjusted by a roll press after drying.
- the negative electrode plate 6D has a copper foil as a negative electrode current collector foil.
- a negative electrode active material mixture containing a carbon material such as graphite capable of reversibly occluding and releasing lithium ions as a negative electrode active material is coated on both surfaces of the copper foil substantially uniformly and substantially uniformly.
- the negative electrode active material mixture contains a conductive material such as acetylene black and a binder such as PVDF.
- the uncoated part 6B in which the negative electrode active material mixture is not applied is formed on the side edge on one side in the longitudinal direction of the copper foil. That is, the copper foil is exposed in the uncoated portion 6B.
- the density of the negative electrode plate 6D is adjusted by a roll press after drying.
- the length of the negative electrode plate 6D is such that when the positive electrode plate 6E and the negative electrode plate 6D are wound, the positive electrode plate 6E does not protrude from the negative electrode plate 6D in the winding direction at the innermost winding and outermost winding. In addition, it is set longer than the length of the positive electrode plate 6E.
- the width (length in the WH direction) of the coating portion of the negative electrode active material mixture is such that the coating portion of the positive electrode active material mixture is that of the negative electrode active material mixture in the longitudinal direction (WH direction) of the power generation element group 6
- the width is set to be longer than the width of the coated portion of the positive electrode active material mixture so as not to protrude from the coated portion.
- the lithium ion secondary battery 30 is manufactured as follows. That is, after winding the positive and negative electrode plates, the lithium ion secondary battery 30 prepares the power generation element group 6 by bonding the connection plates 5A and 5B and the bonding plates 23A and 23B to the uncoated portions 6A and 6B, respectively.
- Preparation step fixing step of fixing the positive electrode terminal 4A and the negative electrode terminal 4B to the through hole 1B of the battery can 1 via the seal 13, respectively, placing the power generation element group 6 in the battery can 1, and the positive electrode terminal 4A, the negative electrode terminal 4B is manufactured through a connection step for electrically and mechanically connecting 4B to the connection plates 5A and 5B, and a joining step for joining the battery can 1 and the battery lid 3 to each other.
- a connection step for electrically and mechanically connecting 4B to the connection plates 5A and 5B
- a joining step for joining the battery can 1 and the battery lid 3 to each other.
- the preparation step In the preparation step, the positive electrode plate 6E and the negative electrode plate 6D prepared in advance are wound through the separator 6C. At this time, the separator 6C, the negative electrode plate 6D, the separator 6C, and the positive electrode plate 6E are laminated in this order so that the uncoated part 6A of the positive electrode plate 6E and the uncoated part 6B of the negative electrode plate 6D are arranged on opposite sides. Then, it is wound into an oval cross section from one side. Only the separator 6C is wound around the winding start portion and the winding end portion about 2 to 3 times.
- connection plates 5A and 5B are arranged on one side of the uncoated portions 6A and 6B, respectively, and joining plates 23A and 23B are arranged on the other side, respectively.
- the uncoated portion 6A side and the uncoated portion 6B side are each subjected to ultrasonic treatment, and the connecting plate 5A, the uncoated portion 6A and the joining plate 23A, the connecting plate 5B, the uncoated portion 6B and the joining plate 23B Are joined together so that the power generation element group 6 is obtained.
- the positive electrode terminal 4 ⁇ / b> A and the negative electrode terminal 4 ⁇ / b> B are fixed to the through hole 1 ⁇ / b> B of the battery can 1 through the seal 13.
- the seal 13 is formed by transfer molding a PPS or PBT resin material in the gap while the battery can 1 and the positive electrode terminal 4A and the negative electrode terminal 4B are held at a constant interval.
- connection step In the connection step, the power generation element group 6 produced in the preparation step is placed in the battery can 1 via the insulating case 7A. At this time, it mounts so that the uncoated parts 6A and 6B may be located immediately above the through holes 1B formed on both sides in the WH direction. Further, the connection plates 5A and 5B respectively joined to the uncoated portions 6A and 6B are placed so as to face the inner bottom surface of the battery can 1. The connection plates 5A and 5B are electrically and mechanically connected to the positive terminal 4A and the negative terminal 4B by laser beam welding, respectively.
- the laser beam is irradiated from the bottom surface 1A side of the battery can 1, that is, from the recessed portion side of the positive electrode terminal 4A and the negative electrode terminal 4B toward the connection plates 5A and 5B.
- the notch is formed on both sides of the WH direction in the insulating case 7A, there is no problem when connecting the connection plates 5A and 5B to the positive terminal 4A and the negative terminal 4B.
- the insulating case 7B is placed on the power generation element group 6 in which the connecting plates 5A and 5B and the positive terminal 4A and the negative terminal 4B are connected in the connecting step.
- the outer peripheral end of the battery lid 3 is fitted into a mating portion 24 formed in the opening of the battery can 1.
- a laser beam is irradiated from above the battery lid 3 toward a fitting portion between the battery lid 3 and the mating portion 24 to weld the battery can 1 and the battery lid 3 together.
- the injection port is sealed with the injection plug 22 to complete the manufacture of the lithium ion secondary battery 30.
- a nonaqueous electrolytic solution in which a lithium salt such as lithium hexafluorophosphate (LiPF 6 ) is dissolved in a carbonic acid ester-based organic solvent such as ethylene carbonate is used as the electrolytic solution.
- a lithium salt such as lithium hexafluorophosphate (LiPF 6 )
- a carbonic acid ester-based organic solvent such as ethylene carbonate
- the prismatic secondary battery is usually configured as follows. That is, as shown in FIG. 8 as a comparative example, the secondary battery 70 has a battery can 41 having a depth dimension larger than the dimensions of two sides perpendicular to the opening by a deep drawing method.
- the battery can 41 accommodates a power generation element group 46 via an insulating case 47.
- uncoated portions 46A and 46B of the active material mixture of the positive and negative electrode plates are formed at both ends, respectively.
- Connection plates 45A and 45B are joined to uncoated portions 46A and 46B by joint portions 48A and 48B, respectively.
- the opening of the battery can 41 is sealed with a battery lid 43.
- a positive electrode terminal 44 ⁇ / b> A and a negative electrode terminal 44 ⁇ / b> B are fixed to the battery lid 43 via a seal 53.
- An electrolytic solution is injected into the battery can 41 from the injection port 60, and the injection port 60 is hermetically sealed.
- connection plates 45A and 45B extend from the joints 48A and 48B to the positive terminal 44A and the negative terminal 44B, respectively, along the outline of the power generation element group 46. Further, the widths of the connection plates 45A and 45B are smaller than the inner dimension of the battery can 41 in the thickness direction. That is, the shapes of the connection plates 45A and 45B are limited by the shapes of the power generation element group 46 and the battery can 41, and the current path length increases and the current path width decreases. For this reason, the electrical resistance of the connection plates 45A and 45B, and consequently the battery internal resistance, is increased, which adversely affects battery performance such as charge / discharge characteristics.
- the battery can 41 has a shape that entirely includes the power generation element group 46 and the connection plates 45A and 45B, the outer shape of the battery can 41 is increased. Furthermore, since the power generation element group 46 is inserted deeply into the narrow battery can 41, workability is reduced. In particular, if the surface of the power generation element group 46 is rubbed at the opening of the battery can 41, there is a possibility that problems such as damage to the power generation element group 46 and entry of material powder into the battery can 41 may occur. In the production of the battery can 41, the deep drawing method must be adopted, which increases the cost. That is, in the secondary battery 70, (2) the battery outer shape is enlarged, (3) it is difficult to accommodate the power generation element group 46 in the battery can 41, and (4) the battery can 41 is expensive. is there.
- the present embodiment is a secondary battery that can solve the problems (1) to (7).
- the through holes 1B are formed in the offset surfaces 11 formed at both ends of the bottom surface 1A of the battery can 1 in the WH direction.
- the positive terminal 4A and the negative terminal 4B are fixed to the through hole 1B, respectively.
- the uncoated portions 6 ⁇ / b> A and 6 ⁇ / b> B of the positive and negative electrode plates constituting the power generation element group 6 are located immediately above the through hole 1 ⁇ / b> B of the battery can 1.
- the connection plate 5A connected to the uncoated portion 6A and the positive terminal 4A are joined, and the connection plate 5B connected to the uncoated portion 6B and the negative terminal 4B are joined.
- the connecting plates 5A and 5B can be widened by the width of the uncoated portions 6A and 6B of the positive and negative plates (the length in the HH direction). For this reason, since the width
- the length of the current path can be shortened from the uncoated portions 6A, 6B to the side surface of the nearest battery can 1, and the width can be freely increased by the width of the uncoated portions 6A, 6B. be able to. Therefore, in the lithium ion secondary battery 30, internal resistance can be reduced, and battery performance such as charge / discharge characteristics can be improved.
- the uncoated portions 6A and 6B of the positive and negative electrode plates constituting the power generation element group 6 are respectively positioned immediately above the inside of the through hole 1B of the battery can 1. Therefore, in the battery can 1, the connection plates 45 ⁇ / b> A and 45 ⁇ / b> B do not extend in the WH direction and the HH direction along the outline of the power generation element group 46 as in the conventional secondary battery 70 (see also FIG. 8). ). Thereby, in the battery can 1, the required dimension of a WH direction and a HH direction can be restrained small, As a result, size reduction of a battery size can be achieved.
- the battery can 1 is a shallow and bottomed base in which the length of one side perpendicular to the two sides is smaller than the length of any two sides perpendicular to the four sides constituting the outer periphery of the opening. It is formed in a rectangular parallelepiped shape. For this reason, in the opening of the battery can 1, the dimensions in the WH direction and the HH direction are increased, and the dimension in the DH direction is decreased. Therefore, the power generation element group 6 is placed in a space defined by the battery can 1 and the battery lid 3. Easy to accommodate. Thereby, it can also suppress that the surface of the electric power generation element group 6 etc. are damaged by the edge of the opening part of the battery can 1.
- the battery can 1 is shallow, the number of drawing and forging steps during manufacturing of the battery can can be reduced. Therefore, manufacturing of the battery can 1 can be facilitated, and no trouble is required for housing the power generation element group 6 in the battery can 1, and generation of defects due to damage can be suppressed. As a result, it is possible to improve battery manufacturing efficiency and reduce costs.
- the end portions of the positive electrode terminal 4A and the negative electrode terminal 4B are extended outward from the outer periphery of the battery can 1 in the WH direction.
- the battery lid 3 has a substantially flat shape, and a through hole 1B to which the positive electrode terminal 4A and the negative electrode terminal 4B are fixed is formed in the offset surface 11 of the battery can 1. For this reason, in the lithium ion secondary battery 30, both sides in the DH direction are formed substantially flat. Thereby, the assembled battery connected in series and parallel can be easily produced by arranging a plurality of lithium ion secondary batteries 30 in the DH direction.
- the assembled battery can be assembled without going through the process of moving the positive electrode terminal 4A and the negative electrode terminal 4B as compared with the conventional secondary battery 70 in which both the positive and negative electrode terminals are arranged on the battery lid. Therefore, it is possible to reduce the cost of assembling the assembled battery and to increase the capacity and output by using the assembled battery. Therefore, the assembled battery can be suitably used as a vehicle secondary battery system.
- conventional battery cans and battery lids mainly made of iron are easy to be hermetically sealed by a double tightening method or the like, whereas battery cans and battery lids mainly made of aluminum are double wound.
- the fastening method is applied, a crack or the like is generated and it is difficult to achieve airtightness.
- the battery can 1 and the battery lid 3 can be welded with a laser beam or the like.
- the battery can 1 and the battery lid 3 can be formed using aluminum as a main material. Thereby, since the battery can 1 and the battery cover 3 are reduced in weight, the weight of the whole battery can be reduced.
- the offset surface 11 is formed on the battery can 1. For this reason, the protrusion of the positive electrode terminal 4A and the negative electrode terminal 4B in the battery thickness direction (DH direction) can be eliminated, and the contribution to the battery thickness dimension can be eliminated. Thereby, thickness reduction of the lithium ion secondary battery 30 can be achieved.
- the through hole 1B in the offset surface 11 the distance between the positive terminal 4A and the negative terminal 4B and the uncoated portions 6A and 6B of the positive and negative electrodes is also reduced. As a result, the length of the current path can be further reduced, and the internal resistance can be further reduced.
- an insulating case 7A is disposed between the power generation element group 6 and the battery can 1, and an insulation case 7B is disposed between the power generation element group 6 and the battery lid 3. . That is, the power generation element group 6 is disposed in a space defined by the battery can 1 and the battery lid 3 while being sandwiched between the insulating cases 7A and 7B. For this reason, insulation between the power generation element group 6, the battery can 1, and the battery lid 3 can be ensured. Further, the edges on both sides in the HH direction of the insulating case 7A are in contact with the edges on both sides in the HH direction of the insulating case 7B.
- insulation case 7A, 7B mutually presses in a DH direction, when external force acts, the external stress with respect to the electric power generation element group 6 can be relieve
- a connecting member 9A that is electrically and mechanically connected to the uncoated portion 6A of the positive electrode plate and is electrically connected to the outside of the battery through the through hole 1B is formed with a flat protruding end surface.
- the connecting member includes a flat positive electrode terminal and a cup-shaped connection terminal fixed to the positive electrode terminal, and the cup outer surface of the connection terminal is uncoated on the positive electrode plate through the through hole of the battery can. You may make it join to a construction part. An example of such a configuration will be described below.
- the positive electrode terminal 14A and the negative electrode terminal 14B are both substantially oval and formed in a flat plate shape, and circular through holes are formed on both sides in the longitudinal direction.
- Each of the positive terminal 14A and the negative terminal 14B has a through hole on one side connected to each of the connection portions 28A and 28B at approximately one central portion at both end portions (left and right sides in FIG. 5) of the bottom surface 1A of the battery can 1.
- the other side of the positive electrode terminal 14 ⁇ / b> A and the negative electrode terminal 14 ⁇ / b> B extends outward from the outline of the battery can 1. As shown in FIG.
- connection terminal 15 ⁇ / b> B is made of a metal having a recess 25 and is formed in a cup shape (columnar shape).
- the cup outer bottom surface of the connection terminal 15B is formed substantially flat.
- the connection terminal 15B has a flange portion 26 on the outer periphery on the cup outer bottom surface side.
- the opening side edge part of the connection terminal 15B is inserted by the through-hole of one side.
- the connection terminal 15 ⁇ / b> B is inserted into the through hole 1 ⁇ / b> B formed in the offset surface 11 of the battery can 1 through the seal 13.
- the opening end of the connection terminal 15 ⁇ / b> B is fixed by a crimping portion 27.
- connection terminal 15 ⁇ / b> B is fixed by compressing the offset surface 11, the negative electrode terminal 14 ⁇ / b> B, and the seal 13 with the flange portion 26 and the caulking portion 27.
- the seal 13 ensures insulation between the battery can 1 and the negative electrode terminal 14 ⁇ / b> B and airtightness in the battery can 1.
- the cup outer bottom surface of the connection terminal 15B is bonded to the uncoated portion 6B of the negative electrode plate constituting the power generation element group 6 placed immediately above the inside of the through hole 1B of the battery can 1 by, for example, an ultrasonic bonding method. ing.
- connection plate 5B and the negative electrode terminal 4B are welded with a laser beam, but the connection terminal 15B and the negative electrode terminal 14B are fixed by caulking, so that welding can be eliminated. . For this reason, simplification of a process can be achieved.
- welding may be applied to the contact portion between the two.
- 5 and 6 show an example in which the negative electrode terminal 14B extends straight to the outside of the battery.
- the positive electrode terminal 4A and negative electrode of the present embodiment described above are used. It is also possible to form like the terminal 4B.
- each of the positive electrode terminal 16A and the negative electrode terminal 16B is formed in a rectangular flat plate shape. One of the two opposite sides is one on one side and two on the other side. Two through holes are formed. In the positive terminal 16A and the negative terminal 16B, two through holes formed on the other side have two connecting portions 28A-1 and 28A at two ends of the bottom surface 1A of the battery can 1 (left and right sides in FIG. 7).
- the positive electrode terminal 16A and the negative electrode terminal 16B are connected to the uncoated portions 6A and 6B of the positive and negative electrode plates, respectively, via the cup-shaped connection terminals 15B described above.
- the following effects can be obtained. That is, since the uncoated portions 6A and 6B of the positive and negative electrode plates and the positive electrode terminal 16A and the negative electrode terminal 16B are respectively connected at two locations, the area of the current path increases and the current density is made uniform. Therefore, the battery internal resistance can be further reduced.
- this invention is not limited to this.
- it can be formed by laminating positive and negative electrode plates.
- rectangular positive plates 6E and rectangular negative plates 6D are alternately stacked via rectangular separators 6C.
- the uncoated portions 6 ⁇ / b> A and 6 ⁇ / b> B are stacked so as to be positioned on both end faces of the power generation element group 6. Even in such a stacked power generation element group, the same effects as those of the above-described embodiment can be obtained.
- the present invention is not limited to this, and an aluminum-based alloy may be used. .
- an aluminum-based alloy By using aluminum or an aluminum-based alloy, the weight can be reduced as compared with the case of using an iron-based material.
- the mating portion 24 is formed at the opening end portion of the battery can 1 is shown, but the battery can 1 is sealed with the battery lid 3 without forming the mating portion 24. You may do it. In this case, it is only necessary that the contour of the battery lid 3 matches the contour of the member that forms the opening of the battery can 1, and the outer edge of the battery lid 3 may be overlapped and welded to the end of the opening. .
- the insulating cases 7A and 7B are formed in the same shape, but the present invention is not limited to this.
- the cutouts may be formed on at least one side including the portion corresponding to the liquid injection port 20.
- the insulating cases 7A and 7B the example in which the notches are formed up to the outer edges on both sides in the WH direction is shown. ) May be formed. That is, the notch in the present invention is a concept including a hole.
- the lithium ion secondary battery 30 is exemplified as the secondary battery, but the present invention is not limited to this and can be applied to secondary batteries in general.
- lithium manganate was illustrated as a positive electrode active material and graphite was illustrated as a negative electrode active material, respectively, this invention is not restrict
- the positive electrode active material is a material capable of inserting and removing lithium ions, and a lithium transition metal composite oxide in which a sufficient amount of lithium ions has been inserted in advance may be used. A material in which a part of lithium or a transition metal is substituted or doped with an element other than those may be used.
- the negative electrode active material other than graphite for example, carbon materials such as coke and amorphous carbon can be mentioned, and the particle shape is also particularly limited such as scaly, spherical, fibrous, and massive. It is not a thing.
- the present invention is not particularly limited with respect to the conductive material and binder exemplified in the present embodiment, and any of those normally used in lithium ion secondary batteries can be used.
- binders that can be used in other embodiments include polytetrafluoroethylene, polyethylene, polystyrene, polybutadiene, butyl rubber, nitrile rubber, styrene / butadiene rubber, polysulfide rubber, nitrocellulose, cyanoethyl cellulose, various latexes, acrylonitrile, fluorine.
- examples thereof include polymers such as vinyl fluoride, vinylidene fluoride, propylene fluoride, and chloroprene fluoride, and mixtures thereof.
- a non-aqueous electrolyte solution in which LiPF 6 is dissolved in an ethylene carbonate-based organic solvent such as ethylene carbonate is exemplified, but a non-aqueous electrolyte in which a general lithium salt is used as an electrolyte and this is dissolved in an organic solvent.
- An electrolytic solution may be used, and the present invention is not particularly limited to the lithium salt or organic solvent used.
- the electrolyte LiClO 4 , LiAsF 6 , LiBF 4 , LiB (C 6 H 5 ) 4 , CH 3 SO 3 Li, CF 3 SO 3 Li, or a mixture thereof can be used.
- organic solvent diethyl carbonate, propylene carbonate, 1,2-diethoxyethane, ⁇ -butyrolactone, sulfolane, propionitrile, or a mixed solvent in which two or more of these are mixed can be used.
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Abstract
Description
リチウムイオン二次電池30は、次のように製造されたものである。すなわち、リチウムイオン二次電池30は、正負極板を捲回した後、未塗工部6A、6Bに接続板5A、5Bおよび接合板23A、23Bをそれぞれ接合して発電要素群6を準備する準備ステップ、電池缶1の貫通孔1Bにシール13を介して正極端子4A、負極端子4Bをそれぞれ固定する固定ステップ、電池缶1内に発電要素群6を載置し、正極端子4A、負極端子4Bを接続板5A、5Bとそれぞれ電気的および機械的に接続する接続ステップ、電池缶1と電池蓋3とを接合する接合ステップを経て製造される。以下、ステップ順に説明する。
準備ステップでは、予め作製した正極板6Eと、負極板6Dとをセパレータ6Cを介して捲回する。このとき、正極板6Eの未塗工部6Aと負極板6Dの未塗工部6Bとが互いに反対側に配置されるように、セパレータ6C、負極板6D、セパレータ6C、正極板6Eの順に積層し、一側から断面長円状に捲回する。捲き始め部分および巻き終わり部分には、セパレータ6Cのみを2~3周程度捲回する。互いに反対側にそれぞれ断面渦巻状に形成された未塗工部6A、6BのHH方向略中央部を平坦状にプレス加工する(図2、図4も参照)。未塗工部6A、6Bの一側にそれぞれ接続板5A、5Bを配し、他側にそれぞれ接合板23A、23Bを配する。未塗工部6A側、未塗工部6B側にそれぞれ超音波処理を施し、接続板5A、未塗工部6Aおよび接合板23Aと、接続板5B、未塗工部6Bおよび接合板23Bと、をそれぞれ一体となるように接合することで発電要素群6を得る。
固定ステップでは、電池缶1の貫通孔1Bにシール13を介して正極端子4A、負極端子4Bをそれぞれ固定する。シール13の貫通孔に正極端子4A、負極端子4Bの突出部Tをそれぞれ挿入し、シール13のリング状の突出部を貫通孔1Bに固定することで、正極端子4A、負極端子4Bがそれぞれ貫通孔1Bに挿着される。本例では、電池缶1と正極端子4A、負極端子4Bとを一定の間隔に保持した状態で隙間にPPSやPBTの樹脂材料をトランスファモールドすることでシール13を形成する。トランスファモールドにより、電池缶1と正極端子4A、負極端子4Bとの相対位置が固定され、両者間の絶縁が確保され、かつ、気密が確立される。
接続ステップでは、準備ステップで作製した発電要素群6を電池缶1内に絶縁ケース7Aを介して載置する。このとき、WH方向両側に形成された貫通孔1Bの直上に未塗工部6A、6Bが位置するように載置する。また、未塗工部6A、6Bにそれぞれ接合された接続板5A、5Bが電池缶1の内底面と対向するように載置する。接続板5A、5Bと、正極端子4A、負極端子4Bとをそれぞれレーザービーム溶接で電気的、機械的に接続する。このとき、電池缶1の底面1A側、すなわち、正極端子4A、負極端子4Bの窪み部分側から接続板5A、5B側に向けてレーザービームを照射する。なお、絶縁ケース7AにはWH方向両側に切り欠きが形成されているため、接続板5A、5Bと、正極端子4A、負極端子4Bとの接続時に支障を生じることはない。
接合ステップでは、接続ステップで接続板5A、5Bと正極端子4A、負極端子4Bとがそれぞれ接続された発電要素群6に絶縁ケース7Bを載置する。電池蓋3の外周端を電池缶1の開口部に形成された合わせ部24に嵌合させる。電池蓋3の上方から電池蓋3と合わせ部24との嵌合部分に向けてレーザービームを照射し、電池缶1と電池蓋3とを溶接する。注液口20から電解液を注液した後、注液口を注液栓22で密栓し、リチウムイオン二次電池30の製造を完成させる。電解液として、本例では、エチレンカーボネート等の炭酸エステル系の有機溶媒に6フッ化リン酸リチウム(LiPF6)等のリチウム塩が溶解された非水電解液が用いられている。なお、絶縁ケース7BのWH方向両側に形成された切り欠きの一方が、注液口20に対応する位置に形成されているため、絶縁ケース
7Bが注液の障害となることはない。
次に、本実施形態のリチウムイオン二次電池30の作用等について説明する。
Claims (15)
- 浅型有底直方体形状であって、前記浅型有底直方体の底と直交する1辺の長さが他の2辺の長さより小さく、前記底の外周を構成する4辺のうち対向する2辺の近傍にそれぞれ貫通孔が形成された電池缶と、
前記電池缶の底の反対側に形成された開口部を封止する電池蓋と、
前記電池缶と前記電池蓋とで画定された空間内に配置され、捲回若しくは積層され活物質合剤の未塗工部が互いに反対側に形成された正負極板を有し、前記正負極板の未塗工部が前記電池缶の貫通孔の形成面にそれぞれ対向するように内側に位置する発電要素群と、
前記正負極板の未塗工部にそれぞれ電気的および機械的に接続され、前記電池缶の貫通孔を介して電池外部と導通する接続部材と、
を備えた二次電池。 - 請求項1に記載の二次電池において、
前記貫通孔は前記底の両端部側に形成されており、前記正極板に接続され前記貫通孔を介して電池外部と導通する接続部材と、前記負極板に接続され前記貫通孔を介して電池外部と導通する接続部材と、が互いに反対方向に延在している。 - 請求項1に記載の二次電池において、
前記電池缶は、前記底の外周を構成する4辺のうち対向する2辺の近傍に前記底の面より前記電池蓋側に位置するオフセット面をそれぞれ有しており、前記オフセット面に前記貫通孔が形成されている。 - 請求項3に記載の二次電池において、
前記電池缶には前記オフセット面に複数の前記貫通孔がそれぞれ形成されており、前記接続部材は前記貫通孔のそれぞれを介して前記正負極板の未塗工部に電気的および機械的に接続されている。 - 請求項1に記載の二次電池において、
前記接続部材は、前記正負極板の未塗工部に電気的および機械的に接続された接続部と、前記接続部と一体に形成され前記電池缶の外部に延出された延出部とを有し、前記延出部は、前記電池缶の外底および前記底と直交する1辺に沿うように屈曲しており、一端部が前記電池蓋側に延出している。 - 請求項1に記載の二次電池において、
前記電池缶は、前記貫通孔が近傍に形成された2辺以外のいずれか1辺と隣接する側面に、電池内圧上昇時に内圧を解放する安全弁を有する。 - 請求項1に記載の二次電池において、
前記電池蓋は、輪郭が前記電池缶の開口部を形成する部材の輪郭と合致し、前記電池缶の開口部に溶接されている。 - 請求項1に記載の二次電池において、
前記接続部材は、前記未塗工部の前記電池缶の底側の面にそれぞれ一面側が接合された接続板と、突出端面が平坦状の突出部を一側に有し他側が外部に導出された外部端子とで構成され、前記外部端子の突出端面がそれぞれ前記電池缶の貫通孔を介して前記接続板の他面側に接合されている。 - 請求項1に記載の二次電池において、
前記接続部材は、平板状の外部端子と、前記外部端子に固定されたカップ状の接続端子とで構成され、前記接続端子のカップ外底面がそれぞれ前記電池缶の貫通孔を介して前記未塗工部に接合されている。 - 請求項1に記載の二次電池において、
前記電池缶および前記電池蓋は、アルミニウム製またはアルミニウム合金製である。 - 請求項1に記載の二次電池において、
前記発電要素群および前記電池蓋の間と、前記発電要素群および前記電池缶の間とにそれぞれ配された樹脂製板材、をさらに備える。 - 請求項11に記載の二次電池において、
前記発電要素群および前記電池缶の間に配された樹脂製板材は、前記電池缶の貫通孔に対応する位置に切り欠きが形成されている。 - 請求項11に記載の二次電池において、
前記発電要素群および前記電池蓋の間に配された樹脂製板材は、外周を構成する少なくとも1辺に切り欠きが形成されている。 - 請求項1に記載の二次電池の製造方法であって、
前記電池缶の貫通孔に絶縁部材を介在させて前記接続部材を固定する固定ステップと、
前記電池缶内に前記発電要素群を載置し、前記接続部材と前記正負極板の未塗工部とを電気的および機械的に接続する接続ステップと、
前記電池缶と前記電池蓋とを接合する接合ステップと、
を含む、製造方法。 - 請求項14に記載の製造方法において、
前記接続ステップでは、前記発電要素群を前記正負極板の未塗工部が前記電池缶の貫通孔の形成面にそれぞれ対向するように内側に位置させて載置する。
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US20120301759A1 (en) * | 2011-05-27 | 2012-11-29 | Gs Yuasa International Ltd. | Electric storage device and insulation cover |
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KR101222309B1 (ko) * | 2010-12-29 | 2013-01-15 | 로베르트 보쉬 게엠베하 | 이차전지 |
JP5616248B2 (ja) * | 2011-02-01 | 2014-10-29 | 日立オートモティブシステムズ株式会社 | 二次電池およびその製造方法 |
WO2012143995A1 (ja) * | 2011-04-18 | 2012-10-26 | 日立ビークルエナジー株式会社 | 二次電池 |
JP5811893B2 (ja) * | 2011-09-28 | 2015-11-11 | 株式会社豊田自動織機 | 蓄電装置、及び車両 |
KR102096067B1 (ko) * | 2013-01-31 | 2020-04-01 | 삼성에스디아이 주식회사 | 배터리 팩 |
JP2014241206A (ja) * | 2013-06-11 | 2014-12-25 | 日立マクセル株式会社 | 非水電解質二次電池 |
JP2015153682A (ja) * | 2014-02-18 | 2015-08-24 | 日立マクセル株式会社 | 非水電解質二次電池 |
CN107528090A (zh) * | 2016-06-20 | 2017-12-29 | 兴能高科技股份有限公司 | 二次锂电池结构 |
JP6620942B2 (ja) | 2016-08-26 | 2019-12-18 | トヨタ自動車株式会社 | 二次電池 |
DE102018204592A1 (de) * | 2018-03-27 | 2019-10-02 | Bayerische Motoren Werke Aktiengesellschaft | Batteriezelle für eine Batterie eines Kraftfahrzeugs, wobei ein Gehäuse der Batteriezelle zweiteilig ausgebildet ist, sowie Verfahren |
JP7045644B2 (ja) * | 2018-12-10 | 2022-04-01 | トヨタ自動車株式会社 | 密閉型電池および組電池 |
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JPH1131486A (ja) * | 1997-07-08 | 1999-02-02 | Ricoh Co Ltd | 扁平型電池 |
JP2000251868A (ja) * | 1999-02-25 | 2000-09-14 | Mitsubishi Electric Corp | 薄型電池 |
JP2004031137A (ja) * | 2002-06-26 | 2004-01-29 | Nissan Motor Co Ltd | 薄型電池 |
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US20120301759A1 (en) * | 2011-05-27 | 2012-11-29 | Gs Yuasa International Ltd. | Electric storage device and insulation cover |
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