WO2014203344A1 - Rectangular-prism-shaped secondary battery - Google Patents

Rectangular-prism-shaped secondary battery Download PDF

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Publication number
WO2014203344A1
WO2014203344A1 PCT/JP2013/066816 JP2013066816W WO2014203344A1 WO 2014203344 A1 WO2014203344 A1 WO 2014203344A1 JP 2013066816 W JP2013066816 W JP 2013066816W WO 2014203344 A1 WO2014203344 A1 WO 2014203344A1
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WO
WIPO (PCT)
Prior art keywords
battery
external terminal
mark
secondary battery
prismatic secondary
Prior art date
Application number
PCT/JP2013/066816
Other languages
French (fr)
Japanese (ja)
Inventor
佳佑 澤田
佐藤　豊
勇人 小口
Original Assignee
日立オートモティブシステムズ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日立オートモティブシステムズ株式会社 filed Critical 日立オートモティブシステムズ株式会社
Priority to PCT/JP2013/066816 priority Critical patent/WO2014203344A1/en
Publication of WO2014203344A1 publication Critical patent/WO2014203344A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/30—Arrangements for facilitating escape of gases
    • 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/209—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for prismatic or rectangular cells
    • 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
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/289—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by spacing elements or positioning means within frames, racks or packs
    • H01M50/293—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by spacing elements or positioning means within frames, racks or packs characterised by the material
    • 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
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
    • H01M50/593—Spacers; Insulating plates
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present invention relates to a prismatic secondary battery used for in-vehicle applications, for example.
  • a flat wound electrode body as a power generation element is accommodated in a rectangular battery container.
  • the wound electrode body is configured by winding a positive electrode plate and a negative electrode plate in a state of being insulated with a separator interposed therebetween.
  • a positive electrode current collector laminated portion in which positive electrode uncoated portions are bundled is provided on one side in the winding axis direction of the wound electrode body, and a negative electrode uncoated portion is bundled on the other side in the winding axis direction.
  • a negative electrode current collector laminate is provided, and a positive electrode connection terminal is joined to the positive electrode current collector laminate, and a negative electrode connection terminal is joined to the negative electrode current collector laminate.
  • the positive electrode connection terminal and the negative electrode connection terminal are electrically connected to, for example, the positive electrode external terminal and the negative electrode external terminal arranged on the same surface of the battery container such as a battery lid on the outside of the battery container.
  • the structure is neutral, that is, the battery container is insulated from the wound electrode body.
  • a polarity display is provided in the vicinity of the positive external terminal and the negative external terminal.
  • a structure is disclosed in which an external insulator disposed between a lid, a positive electrode external terminal, and a negative electrode external terminal has a polarity display (see, for example, Patent Document 1).
  • the external insulator is provided on the battery lid side, and the polarity display cannot be visually recognized from the can bottom side. Therefore, in a situation where the polarity display of the external insulator cannot be confirmed, it is unclear which of the battery width direction one side or the other side is the positive electrode side or the negative electrode side, and the direction of the positive electrode side or the negative electrode side of the battery is recognized. The battery may be accidentally placed on the opposite side.
  • the present invention is intended to provide a prismatic secondary battery in which the orientation of the positive electrode side and the negative electrode side of the battery can be confirmed from the can bottom side.
  • the prismatic secondary battery of the present invention that solves the above problems includes a battery can having a rectangular can bottom, a battery lid that seals an opening facing the bottom of the battery can, and a positive electrode provided on the battery lid.
  • a first orthogonal to the long side of the bottom surface of the can is formed outside the bottom surface of the battery can.
  • a mark having an asymmetric shape with respect to at least one of the center line and the second center line orthogonal to the short side of the bottom surface of the can is provided.
  • FIG. 1 is an external perspective view of a prismatic secondary battery according to a first embodiment.
  • FIG. 5B is a sectional view taken along line BB in FIG. 5B.
  • FIG. 7 is a cross-sectional view of the assembled battery shown in FIG.
  • FIG. 10B is a front view showing the bottom surface of the prismatic secondary battery of FIG. 10A.
  • FIG. 11B is a front view showing the bottom surface of the prismatic secondary battery of FIG. 11A.
  • FIG. 1 is an external perspective view of a prismatic secondary battery according to the present embodiment
  • FIG. 2 is an exploded perspective view of the prismatic secondary battery according to the present embodiment.
  • the rectangular secondary battery C ⁇ b> 1 includes a battery can 1 and a lid (battery lid) 6.
  • the wound electrode body 3 is accommodated, and the opening 100 of the battery can 1 is sealed by the lid 6.
  • the battery can 1 of the prismatic secondary battery C1 has a so-called square shape, a rectangular can bottom 22, a rectangular tubular side wall 21 rising from the can bottom 22, and the upper end of the side wall 21 facing the can bottom 22. And an opening 100 opened upward.
  • the lid 6 is joined to the battery can 1 by laser welding to constitute a battery container sealed by the battery can 1 and the lid 6.
  • the lid 6 is provided with a positive external terminal 8A and a negative external terminal 8B.
  • the positive external terminal 8 ⁇ / b> A and the negative external terminal 8 ⁇ / b> B are arranged at positions separated from each other on both sides in the long side direction of the lid 6.
  • the wound electrode body 3 is charged via the positive external terminal 8A and the negative external terminal 8B, and power is supplied to the external load.
  • a wound electrode body 3 is accommodated via an insulating protective film 2.
  • the wound electrode body 3 Since the wound electrode body 3 is wound in a flat shape, the wound electrode body 3 has a pair of opposed curved portions having a semicircular cross section and a plane portion formed continuously between the pair of curved portions. is doing.
  • the wound electrode body 3 is inserted into the battery can 1 from one curved portion side so that the winding axis direction is along the lateral width direction of the battery can 1, and the other curved portion side is disposed on the upper opening side.
  • At least a part of the positive electrode foil connection part 31d and the negative electrode foil connection part 32d, which are the flat part of the wound electrode body 3 and the electrode foil exposed part, are bundled into a flat plate shape.
  • (Electrical terminal) 4A and one end of the negative electrode current collector plate (current collecting terminal) 4B are overlapped and connected.
  • the other end of the positive current collector 4A and the other end of the negative current collector 4B are connected to the positive external terminal 8A and the negative external terminal 8B, respectively.
  • a gasket 5 and an insulating plate 7 are provided on the lid 6, respectively. Yes. Moreover, after pouring electrolyte solution into the battery can 1 from the liquid injection port 9, the liquid injection stopper 11 is joined to the cover 6 by laser welding, the liquid injection port 9 is sealed, and the square secondary battery C1 is sealed. .
  • the material of the battery can 1 and the lid 6 is aluminum or aluminum alloy, which is a metal material.
  • Aluminum or an aluminum alloy is used as a material for the positive electrode current collector plate 4A and the positive electrode external terminal 8A.
  • Copper or copper alloy is used as a material for the negative electrode current collector plate 4B and the negative electrode external terminal 8B.
  • the positive external terminal 8A and the negative external terminal 8B have weld joints that are welded to a bus bar or the like (not shown).
  • the weld joint has a rectangular parallelepiped block shape protruding upward from the lid 6, the lower surface faces the surface of the lid 6, and the terminal surfaces 8 a 1 and 8 b 1 which are the upper surfaces are at the same height position as the lid 6. It has the structure which becomes parallel.
  • the positive electrode connecting portion 12A and the negative electrode connecting portion 12B have cylindrical shapes that protrude from the lower surfaces of the positive electrode external terminal 8A and the negative electrode external terminal 8B, respectively, and can be inserted into the positive electrode side through hole 6A and the negative electrode side through hole 6B. is doing. 12 A of positive electrode connection parts and the negative electrode connection part 12B penetrate the cover 6, and are inside the battery can 1 rather than the positive electrode current collecting plate base 41A of the positive electrode current collecting plate 4A and the negative electrode current collecting plate 4B, and the negative electrode current collecting plate base 41B.
  • the positive electrode external terminal 8A, the negative electrode external terminal 8B, the positive electrode current collector plate 4A, and the negative electrode current collector plate 4B are integrally fixed to the lid 6.
  • a gasket 5 is interposed between the positive electrode external terminal 8A and the negative electrode external terminal 8B and the lid 6, and an insulating plate 7 is interposed between the positive electrode current collector plate 4A, the negative electrode current collector plate 4B and the lid 6. Intervened.
  • the positive electrode current collector plate 4A and the negative electrode current collector plate 4B are a rectangular plate-shaped positive electrode current collector plate base portion 41A, a negative electrode current collector plate base portion 41B, a positive electrode current collector plate base portion 41A, which are disposed to face the lower surface of the lid 6. It is bent at the side end of the negative electrode current collector base 41B and extends toward the bottom surface along the wide surface of the battery can 1 to the positive electrode foil connection part 31d and the negative electrode foil connection part 32d of the wound electrode body 3. It has a positive electrode side connection end portion 42A and a negative electrode side connection end portion 42B which are connected in a state of being overlapped facing each other.
  • the positive electrode collector plate base 41A and the negative electrode collector plate base 41B are respectively formed with a positive electrode side opening hole 43A and a negative electrode side opening hole 43B through which the positive electrode connecting part 12A and the negative electrode connecting part 12B are inserted.
  • FIG. 3 is an exploded perspective view showing a state in which a part of the wound electrode body is developed.
  • the wound electrode body 3 is an electrode body obtained by winding a positive electrode body 31 and a negative electrode body 32 in a flat shape with a separator 33 interposed therebetween, and a positive electrode mixture 31b and a negative electrode mixture are provided on both end surfaces in the winding axis direction.
  • a positive foil exposed portion 31c and a negative foil exposed portion 32c that are not coated with 32b are provided.
  • the outermost electrode body is the negative electrode body 32, and the separator 33 is wound further outside.
  • the end of the separator 33 is fixed to the outermost peripheral surface of the separator 33 with an adhesive tape (not shown), and the wound state is maintained.
  • the winding end of the separator 33 is disposed at a substantially central position on one flat surface of the wound electrode body 3, and the central portion in the winding axis direction is fixed by an adhesive tape (not shown).
  • the separator 33 has a role of insulating the positive electrode body 31 and the negative electrode body 32.
  • the negative electrode mixture 32b of the negative electrode body 32 is larger in the width direction than the positive electrode mixture 31b of the positive electrode body 31, and thus the positive electrode mixture 31b is configured to be sandwiched between the negative electrode mixture 32b without fail.
  • the positive electrode body 31 is obtained by applying a positive electrode mixture 31b on both surfaces of a positive electrode foil 31a, and has an uncoated positive electrode foil exposed portion 31c on one side in the width direction of the positive electrode foil 31a.
  • the negative electrode body 32 is obtained by applying a negative electrode mixture 32b on both surfaces of a negative electrode foil 32a, and has an uncoated negative electrode foil exposed portion 32c on the other side in the width direction of the negative electrode foil 32a.
  • the positive electrode foil exposed portion 31c and the negative electrode foil exposed portion 32c are wound so as to be positioned on opposite sides in the winding axis direction.
  • the positive foil 31a is an aluminum alloy foil having a thickness of about 20 to 30 ⁇ m
  • the negative foil 32a is a copper alloy foil having a thickness of about 15 to 20 ⁇ m.
  • the material of the separator 33 is a porous polyethylene resin.
  • the positive electrode active material is a lithium-containing transition metal double oxide such as lithium manganate
  • the negative electrode active material is a carbon material such as graphite capable of reversibly occluding and releasing lithium ions.
  • FIG. 4 is a front view showing the lid of the prismatic secondary battery according to the first embodiment.
  • the lid 6 is composed of a rectangular thin plate member having a size for closing the opening 100 of the battery can 1.
  • the lid 6 is integrally provided with a gas discharge valve 10, and when the pressure in the battery container rises, the gas discharge valve 10 opens to discharge gas from the inside, and the pressure in the battery container is reduced. . Thereby, the safety of the square secondary battery C1 is ensured.
  • the gas discharge valve 10 is arranged at an intermediate position between the positive external terminal 8A and the negative external terminal 8B of the lid 6.
  • the gas discharge valve 10 has a rectangular thin wall surface portion 10a formed by making the plate thickness of the lid 6 thinner than other portions, and is formed to be thinner along the peripheral edge portion and the diagonal line of the thin wall surface portion 10a. It is comprised by the cleavage groove
  • FIG. 5A is an external perspective view showing an example of the prismatic secondary battery in the present embodiment
  • FIG. 5B is a front view showing the bottom surface of the prismatic secondary battery of FIG. 5A
  • FIG. 5C is a cross-sectional view taken along line BB of FIG. It is line sectional drawing.
  • the prismatic secondary battery C1 has a mark 50 provided on the bottom surface 22 of the can.
  • the mark 50 has an asymmetric shape based on at least one of the first center line LC1 orthogonal to the long side of the can bottom surface 22 and the second center line LC2 orthogonal to the short side direction of the can bottom surface 22.
  • the mark 50 has an asymmetric shape with respect to the first center line LC1 and a symmetrical shape with respect to the second center line LC2.
  • the mark 50 is a mark indicating the arrangement of the positive electrode external terminal 8A or the negative electrode external terminal 8B, and the mark indicating the polarity of the positive electrode external terminal 8A or the negative electrode external terminal 8B.
  • the first center line LC1 extends in the direction perpendicular to the long side at the center position in the long side direction of the can bottom surface 22, and the second center line LC2 is orthogonal to the short side in the center position in the short side direction of the can bottom surface 22. It is set to extend in the direction.
  • FIG. 5B shows the first center line LC1 and the second center line LC2, but actually, as shown in FIG. 5A, the first center line LC1 and the second center line LC2 There is no indication.
  • the mark 50 is constituted by a mark, and has a mark 51 having a + shape and a mark 52 having a ⁇ shape.
  • the inscription 51 serves as a mark indicating the positive electrode external terminal 8A, and is provided at the end of the can bottom 22 on the positive electrode side.
  • the inscription 52 serves as a mark indicating the negative electrode external terminal 8B, and is provided at the end of the can bottom 22 on the negative electrode side.
  • the markings 51 and 52 are formed on the bottom surface 22 of the can by, for example, press molding or laser processing.
  • the thickness of the portion of the can bottom 22 where the mark 50 is provided is thicker than the thickness of the cleavage groove 10b where the gas discharge valve 10 of the lid 6 is provided. Therefore, when the internal pressure of the battery rises above a predetermined pressure, the cleavage groove 10b of the gas discharge valve 10 can be easily and preferentially cleaved, and can be prevented from being cleaved at the marking 52.
  • the stamps 51 and 52 When the stamps 51 and 52 are formed by press molding, they can be formed simultaneously during the manufacturing process of press-molding the battery can 1.
  • the stamps 51 and 52 can be formed, for example, by denting the outside of the can bottom 22 with a press die. At this time, as shown in FIG. 5C, by forming a convex portion having a shape corresponding to the recess on the inner side of the can bottom surface 22, it is possible to prevent the surplus meat due to the recess from protruding outside the can bottom surface 22. it can. Therefore, as will be described later, when the cooling plate is brought into contact with the bottom surface 22 of the can as the assembled battery C2, the cooling plate can be brought into contact with the entire surface of the bottom surface 22, thereby obtaining high cooling efficiency. it can.
  • the thickness t of the can bottom 22 can be made the same between the stamps 51 and 52 and the periphery thereof. Therefore, since the gas exhaust valve 10 is not partially thinned, the strength of the bottom surface 22 of the can can be made almost constant over the entire surface.
  • the markings 51 and 52 are formed by laser processing, in addition to the effect that it is possible to prevent the surplus or the like from protruding outside the bottom surface 22 of the can, the markings 51 and 52 are also attached after the prismatic secondary battery C1 is assembled. Has the effect of being able to.
  • the + (plus) and-(minus) markings 51 and 52 are arranged on each of the positive external terminal 8A and the negative external terminal 8B.
  • the present invention is not limited to this. 50 should just have the asymmetrical shape which can discriminate
  • the visual recognition method of the above-mentioned mark 50 is not limited to an operator's visual observation, The thing by visual devices, such as a camera, is also included.
  • the orientation of the positive electrode side and the negative electrode side of the battery can be confirmed from the bottom side by looking at the mark 50 provided on the bottom surface 22 of the can. Therefore, for example, even in a situation where only the bottom surface 22 of the prismatic secondary battery C1 can be visually recognized, it is possible to prevent the battery from being erroneously disposed on the opposite side.
  • the lid 6 is provided with many components such as the positive electrode external terminal 8A, the negative electrode external terminal 8B, the gas discharge valve 10, the liquid injection port 9, and the liquid injection plug 11, and the vacant space is narrow and large. Although a mark cannot be provided, no parts are provided on the bottom surface 22 of the can, and it is easy to provide a large mark. Therefore, compared with the case where it is provided on the lid 6, it has a characteristic effect when it is provided on the bottom surface 22 of the can so that the mark can be easily recognized.
  • FIG. 6 is an external perspective view of the assembled battery according to the present embodiment
  • FIG. 7 is a cross-sectional view taken along the line CC of FIG. 6,
  • FIG. 8 is a perspective view for explaining the assembled method of the assembled battery according to the present embodiment.
  • the assembled battery C2 includes a plurality of rectangular secondary batteries C1 stacked and arranged in the battery thickness direction via spacers 70 between them, and is secured using a pair of end plates and a pair of side plates (not shown). Assembled by.
  • the spacer 70 is made of, for example, an insulating synthetic resin material.
  • the spacer 70 is interposed between the plurality of rectangular secondary batteries C ⁇ b> 1 and faces the wide surface of the side wall surface 21, and the width of the substrate portion 71.
  • a pair of side plate portions 72 projecting in the direction away from each other along the arrangement direction from both ends in the direction and facing the narrow surface of the side wall surface 21 of the prismatic secondary battery C1, and the arrangement direction from one side in the height direction of the substrate portion 71
  • a top plate portion 73 that protrudes in a direction away from each other and faces the lid 6 of the rectangular secondary battery C1.
  • the top plate part 73 is inserted with the positive external terminal 8A and the negative external terminal 8B of the square secondary battery C1 with the cover surface of the cover 6 of the square secondary battery C1 in contact with the inner surface of the top plate part 73.
  • a notch is provided.
  • each spacer 70 holds the positive external terminal 8 ⁇ / b> A and the negative external terminal 8 ⁇ / b> B in a state of protruding from the top plate portion 73 by sandwiching the square secondary battery C ⁇ b> 1 therebetween.
  • the substrate portion 71 of the spacer 70 is brought into contact with the wide surface of the rectangular secondary battery C1, and the side plate portion 72 of the spacer 70 is opposed to the narrow surface of the rectangular secondary battery C1 and pressed from both sides in the arrangement direction.
  • the rectangular secondary battery C1 is held.
  • positive external terminals 8A and negative external terminals 8B are alternately arranged so as to be electrically connected in series to adjacent rectangular secondary batteries C1.
  • a bus bar is bridged between the positive electrode external terminal 8A of one square secondary battery C1 and the negative electrode external terminal 8B of the other square secondary battery C1.
  • the terminal surfaces 8a1 and 8b1 are welded and connected in series in contact with the terminal surfaces 8a1 and 8b1.
  • the bottom surface 22 of each rectangular secondary battery C1 is exposed on one surface of the assembled battery C2, which is a direction orthogonal to the arrangement direction of the rectangular secondary batteries C1, and is not illustrated, for example. It is cooled by contacting the cooling plate.
  • the assembled battery C2 composed of a plurality of prismatic secondary batteries C1 may be assembled on the basis of the lid surface of the lid 6 of the prismatic secondary battery C1.
  • the bottom surface 22 of the can is considered as another reference surface.
  • variations in the position of the terminal surfaces 8a1 and 8b1 in the battery height direction are caused by variations in the dimensions of the battery can 1 and the lid 6.
  • welding between the bus bar (not shown) for electrically connecting the rectangular secondary batteries C1 to the positive external terminal 8A and the negative external terminal 8B becomes unstable.
  • the method of assembling the assembled battery C2 with reference to the lid surface of the lid 6 shown in FIG. 7 can suppress variations in the position of the terminal surfaces 8a1 and 8b1 in the battery height direction.
  • 8A and the negative electrode external terminal 8B are stably welded.
  • the prismatic secondary battery C1 has a marking 51 and a marking 52 as marks 50 indicating the arrangement and polarity of the positive external terminal 8A and the negative external terminal 8B on the outside of the bottom surface 22 of the can. Since the polarity is provided, the polarity can be confirmed from the can bottom side, and the orientation of the positive electrode side and the negative electrode side of the battery can be easily confirmed. Therefore, the assembled battery C ⁇ b> 2 can be assembled without mistaking the external terminal insertion direction.
  • FIG. 9A is an external perspective view showing an example of the prismatic secondary battery according to the second embodiment
  • FIG. 9B is a front view showing the bottom surface of the prismatic secondary battery of FIG. 9A.
  • the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
  • the mark 50 is not a shape of a symbol indicating polarity but a simple geometric shape such as a circle or a rectangle.
  • a mark 50 including a mark 53 and a mark 54 indicating the positive electrode external terminal 8A and the negative electrode external terminal 8B is provided on the outside of the bottom surface 22 of the battery can 1.
  • the engravings 53 and 54 have an asymmetric shape with respect to the first center line LC1 orthogonal to the long side of the can bottom surface 22, and are symmetrical with respect to the second center line LC2 orthogonal to the short side of the can bottom surface 22. It has a different shape.
  • the marks 53 and 54 are marks indicating the arrangement of the positive external terminal 8A or the negative external terminal 8B, and are marks indicating the polarity of the positive external terminal 8A or the negative external terminal 8B.
  • the relationship between the shape type of the mark 50 and the direction of the battery is preset so that the circular mark 53 indicates the positive electrode side and the square mark 54 indicates the negative electrode side. Therefore, it can be confirmed from the bottom of the can whether the one side or the other side in the width direction of the battery is the positive electrode side or the negative electrode side.
  • a circular stamp 53 is provided on the positive electrode external terminal 8A side and a square stamp 54 is provided on the negative electrode external terminal 8B side.
  • the shape of the stamp is limited to a circle or a rectangle.
  • the positive electrode external terminal 8A and the negative electrode external terminal 8B may have any asymmetric shape that can be distinguished from the can bottom side.
  • the orientation of the positive electrode side and the negative electrode side of the battery can be confirmed from the bottom side by looking at the mark 50 provided on the bottom surface 22 of the can. Therefore, for example, even in a situation where only the bottom surface 22 of the prismatic secondary battery C1 can be visually recognized, it is possible to prevent the battery from being erroneously disposed on the opposite side.
  • FIG. 10A is an external perspective view showing an example of a prismatic secondary battery according to the third embodiment
  • FIG. 10B is a front view showing a bottom surface of the prismatic secondary battery of FIG. 10A. Note that the same components as those in the above-described embodiments are given the same reference numerals, and detailed description thereof is omitted.
  • a characteristic feature of the present embodiment is that the mark 50 is provided by printing on the outside of the bottom surface 22 of the can.
  • a mark 50 including a printed display 55 and a printed display 56 indicating the positive electrode external terminal 8 ⁇ / b> A and the negative electrode external terminal 8 ⁇ / b> B is provided outside the bottom surface 22 of the battery can 1.
  • the thickness of the portion provided with the mark 50 on the bottom surface 22 of the can is thicker than the thickness of the cleavage groove 10 b of the gas discharge valve 10 of the lid 6.
  • the print indications 55 and 56 have an asymmetric shape with respect to the first center line LC1 orthogonal to the long side of the can bottom surface 22, and are based on the second center line LC2 orthogonal to the short side of the can bottom surface 22. It has a symmetrical shape.
  • the print displays 55 and 56 are marks indicating the arrangement of the positive external terminal 8A or the negative external terminal 8B, and are marks indicating the polarity of the positive external terminal 8A or the negative external terminal 8B.
  • a + (plus) print display 55 is arranged on the positive electrode external terminal 8A side
  • a-(minus) print display 56 is arranged on the negative electrode external terminal 8B side.
  • the mark 50 may be a printed display having an asymmetric shape capable of distinguishing the positive external terminal 8A and the negative external terminal 8B from the bottom side. Therefore, instead of the print displays 55 and 56 indicating the polarity, for example, as in the second embodiment, a print display having a geometric shape such as a circle or a quadrangle may be used.
  • the printing indications 55 and 56 can be printed by known methods such as plate printing such as intaglio printing and letterpress printing, and plateless printing such as ink jet printing and laser printing.
  • the battery can 1 can be attached with the mark 50 in the state of a single component, and can also be attached after the prismatic secondary battery C1 is assembled. Moreover, compared with the case where a stamp is provided by press molding etc., it has the effect that it can prevent surplus meat etc. protruding outside the can bottom 22. Further, the print indications 55 and 56 as the marks 50 can be easily added as compared with the marks in the first and second embodiments, and the cost can be reduced.
  • FIG. 11A is an external perspective view showing an example of a prismatic secondary battery according to the fourth embodiment
  • FIG. 11B is a front view showing a bottom surface of the prismatic secondary battery of FIG. 11A.
  • the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
  • a characteristic feature of the present embodiment is that a mark 50 is provided only on one side in the long side direction of the bottom surface 22 with respect to the first center line LC1.
  • a mark 50 made of a mark 57 indicating either the positive electrode external terminal 8A or the negative electrode external terminal 8B is provided outside the can bottom 22 of the battery can 1.
  • the stamp 57 has an asymmetric shape with respect to the first center line LC1, and has a symmetrical shape with respect to the second center line LC2.
  • the marking 57 is a mark indicating the arrangement of the positive external terminal 8A or the negative external terminal 8B, and is a mark indicating the polarity of the positive external terminal 8A or the negative external terminal 8B.
  • the cost can be reduced by reducing the number of man-hours. .
  • the circular marking 57 is provided on the positive external terminal 8A side, but the present invention is not limited to this, and it may be on the negative external terminal 8B side. Moreover, what is necessary is just to have an asymmetrical shape on the basis of 1st centerline LC1.
  • FIG. 12A is an external perspective view showing an example of a prismatic secondary battery according to the fifth embodiment
  • FIG. 12B is a front view showing a bottom surface of the prismatic secondary battery of FIG. 12A. Note that the same components as those in the above-described embodiments are given the same reference numerals, and detailed description thereof is omitted.
  • a characteristic point in the present embodiment is that the mark 50 is provided at the center of the bottom surface 22 in the long side direction.
  • a mark 50 made of a mark 58 indicating either the positive electrode external terminal 8A or the negative electrode external terminal 8B is provided on the outer side of the bottom surface 22 of the battery can 1.
  • the engraving 58 is provided on the first center line LC1, has an asymmetric shape with respect to the first center line LC1, and is based on the second center line LC2 orthogonal to the short side of the bottom surface 22 of the can. It has a symmetrical shape.
  • the mark 58 is a mark indicating the arrangement of the positive external terminal 8A or the negative external terminal 8B.
  • the stamp 58 has an arrow shape, and the tip side of the arrow indicates the direction of the positive electrode side of the battery.
  • the marking 58 indicating the arrangement of the positive electrode external terminal 8A is provided.
  • the present invention is not limited thereto, and may be a mark indicating the arrangement of the negative electrode external terminal 8B. Also good.
  • what is necessary is just to have on the 1st center line LC1 orthogonal to the long side of the can bottom face 22, and to have an asymmetrical shape on the basis of 1st center line LC1.
  • FIG. 13A is an external perspective view showing an example of a prismatic secondary battery according to the sixth embodiment
  • FIG. 13B is a front view showing a bottom surface of the prismatic secondary battery of FIG. 13A. Note that the same components as those in the above-described embodiments are given the same reference numerals, and detailed description thereof is omitted.
  • a mark 59 having a symmetrical shape with respect to the first center line LC1 and an asymmetric shape with respect to the second center line LC2 is provided as the mark 50. That is.
  • a mark 50 made of a stamp 59 is provided on the outside of the bottom surface 22 of the battery can 1.
  • the stamp 59 is provided on the first center line LC1, has a symmetrical shape with respect to the first center line LC1, and has an asymmetric shape with respect to the second center line LC2.
  • the mark 59 is a mark indicating the arrangement of the positive external terminal 8A or the negative external terminal 8B.
  • the engraving 59 has a triangular shape, and the positive electrode external terminal 8A is arranged on the right side in the drawing when the rectangular secondary battery C1 is viewed from the bottom surface 22 side of the can, and on the left side in the drawing.
  • the apex of the triangle is arranged on the upper side in the figure, and the base of the triangle is arranged on the lower side in the figure.
  • a triangular mark 59 is provided as the mark 50, but the shape is not limited to a triangle, and the shape of the positive electrode side and the negative electrode side of the battery can be understood when the mark 50 is viewed.
  • a shape that can indicate a direction such as a pentagon or an arrow can be used.
  • the mark 50 is not limited to marking but may be printed.
  • what is necessary is just to have on the 1st center line LC1 orthogonal to the long side of the can bottom face 22, and to have an asymmetrical shape on the basis of 1st center line LC1.
  • the present invention is not limited to the above-described embodiments, and various designs can be made without departing from the spirit of the present invention described in the claims. It can be changed.
  • the above-described embodiment has been described in detail for easy understanding of the present invention, and is not necessarily limited to one having all the configurations described.
  • a part of the configuration of an embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of an embodiment.
  • C1 prismatic secondary battery C2 assembled battery 1 battery can 100 opening 2 insulating protective film 3 wound electrode body 4A positive electrode current collector plate 4B negative electrode current collector plate 5 gasket 6 lid 6A positive electrode side through hole 6B negative electrode side through hole 7 insulating plate 8A Positive electrode external terminal 8B Negative electrode external terminal 9 Injection port 10 Gas discharge valve 11 Injection plug 12A Positive electrode connection portion 12B Negative electrode connection portion 21 Side wall surface 22 Can bottom surface 31 Positive electrode body 31a Positive electrode foil 31b Positive electrode mixture 31c Positive electrode foil exposed portion 32 Negative electrode body 32a Negative electrode foil 32b Negative electrode mixture 32c Negative electrode foil exposed portion 31d Positive electrode foil connection portion 32d Negative electrode foil connection portion 33 Separator 41A Positive electrode current collector plate base portion 41B Negative electrode current collector plate base portion 42A Positive electrode side connection end portion 42B Negative electrode side connection end portion 43A Positive side opening hole 43B Negative side opening hole 51 to 54, 57 to 59 Mark 55, 56 Printing 70 Spacer 71 Substrate part 72 Side plate part 73 Top

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Gas Exhaust Devices For Batteries (AREA)

Abstract

The purpose of this invention is to yield a rectangular-prism-shaped secondary battery, the positive-electrode/negative-electrode orientation of which can be ascertained from the bottom of the case thereof. This invention is a rectangular-prism-shaped secondary battery (C1) that has the following: a battery case (1) that has a rectangular bottom surface (22); a battery lid (6) that seals an opening (100) opposite the bottom surface (22) of the battery case (1); a positive-electrode external terminal (8A) and a negative-electrode external terminal (8B) provided on the battery lid (6); and a gas-discharge valve (10) provided in the battery lid (6). Said rectangular-prism-shaped secondary battery (C1) is characterized in that the outside of the bottom surface (22) of the battery case (1) is provided with marks (50) that are shaped asymmetrically about a first centerline (LC1) that is perpendicular to the long sides of the bottom surface (22) and/or a second centerline (LC2) that is perpendicular to the short sides of the bottom surface (22).

Description

角形二次電池Prismatic secondary battery
　本発明は、例えば車載用途等に使用される角形二次電池に関する。 The present invention relates to a prismatic secondary battery used for in-vehicle applications, for example.
　近年、電気自動車等の動力源として、エネルギー密度の高い角形のリチウムイオン二次電池の開発が進められている。車載用途の二次電池では、携帯電話用などと比較して大容量が必要であるために、複数の二次電池を搭載する場合がある。角形二次電池は、角形の電池容器に、発電要素である偏平の捲回電極体を収容している。捲回電極体は、正極板と負極板を、間にセパレータを介して絶縁された状態で重ねて捲回することによって構成されている。捲回電極体の捲回軸方向一方側には、正極未塗工部が束ねられた正極集電体積層部が設けられ、捲回軸方向他方側には、負極未塗工部が束ねられた負極集電体積層部が設けられており、正極集電体積層部には正極接続端子が接合され、また、負極集電体積層部には負極接続端子が接合されている。正極接続端子および負極接続端子は、例えば電池容器の外側で電池蓋などの電池容器の同一面上に配置された正極外部端子および負極外部端子にそれぞれ導通接続されており、電池容器が電気的に中立から成る構造、すなわち、電池容器が捲回電極体から絶縁された構造を有している。　
　この種の角形二次電池において、正極外部端子および負極外部端子の付近に、極性表示を設けているものが種々提案されている。たとえば、蓋と正極外部端子および負極外部端子との間に配置されている外部絶縁体が極性表示を有する構造が開示されている（例えば特許文献１を参照）。 In recent years, prismatic lithium ion secondary batteries with high energy density have been developed as power sources for electric vehicles and the like. Since a secondary battery for in-vehicle use requires a larger capacity than that for a mobile phone or the like, a plurality of secondary batteries may be mounted. In a rectangular secondary battery, a flat wound electrode body as a power generation element is accommodated in a rectangular battery container. The wound electrode body is configured by winding a positive electrode plate and a negative electrode plate in a state of being insulated with a separator interposed therebetween. A positive electrode current collector laminated portion in which positive electrode uncoated portions are bundled is provided on one side in the winding axis direction of the wound electrode body, and a negative electrode uncoated portion is bundled on the other side in the winding axis direction. In addition, a negative electrode current collector laminate is provided, and a positive electrode connection terminal is joined to the positive electrode current collector laminate, and a negative electrode connection terminal is joined to the negative electrode current collector laminate. The positive electrode connection terminal and the negative electrode connection terminal are electrically connected to, for example, the positive electrode external terminal and the negative electrode external terminal arranged on the same surface of the battery container such as a battery lid on the outside of the battery container. The structure is neutral, that is, the battery container is insulated from the wound electrode body.
Various types of prismatic secondary batteries of this type have been proposed in which a polarity display is provided in the vicinity of the positive external terminal and the negative external terminal. For example, a structure is disclosed in which an external insulator disposed between a lid, a positive electrode external terminal, and a negative electrode external terminal has a polarity display (see, for example, Patent Document 1).
特開2011-71104号公報JP 2011-71104 A
　上記した従来構成の場合、外部絶縁体は電池蓋側に設けられており、極性表示を缶底側から視認することはできない。したがって、外部絶縁体の極性表示を確認できない状況では、電池の幅方向一方側と他方側のいずれが正極側もしくは負極側であるかが不明であり、電池の正極側と負極側の向きを認識することができず、誤って電池の向きを反対側に配置する可能性がある。 In the case of the conventional configuration described above, the external insulator is provided on the battery lid side, and the polarity display cannot be visually recognized from the can bottom side. Therefore, in a situation where the polarity display of the external insulator cannot be confirmed, it is unclear which of the battery width direction one side or the other side is the positive electrode side or the negative electrode side, and the direction of the positive electrode side or the negative electrode side of the battery is recognized. The battery may be accidentally placed on the opposite side.
　本願発明は、缶底側から電池の正極側と負極側の向きを確認できる角形二次電池の提供を目的としている。 The present invention is intended to provide a prismatic secondary battery in which the orientation of the positive electrode side and the negative electrode side of the battery can be confirmed from the can bottom side.
　上記課題を解決する本発明の角形二次電池は、矩形の缶底面を有する電池缶と、該電池缶の缶底面と対向する開口部を封口する電池蓋と、該電池蓋に設けられた正極外部端子および負極外部端子と、前記電池蓋に設けられたガス放出弁と、を有する角形二次電池において、前記電池缶の缶底面の外側には、該缶底面の長辺に直交する第１中心線と、前記缶底面の短辺に直交する第２中心線の少なくとも一方を基準とした非対称な形状を有する目印が設けられていることを特徴としている。 The prismatic secondary battery of the present invention that solves the above problems includes a battery can having a rectangular can bottom, a battery lid that seals an opening facing the bottom of the battery can, and a positive electrode provided on the battery lid. In the prismatic secondary battery having an external terminal and a negative electrode external terminal, and a gas release valve provided on the battery lid, a first orthogonal to the long side of the bottom surface of the can is formed outside the bottom surface of the battery can. A mark having an asymmetric shape with respect to at least one of the center line and the second center line orthogonal to the short side of the bottom surface of the can is provided.
　本発明によれば、目印と電池の向きとの関係を予め設定しておくことにより、電池の正極側と負極側の向きを缶底側から確認できる。なお、上記した以外の課題、構成及び効果は、以下の実施形態の説明により明らかにされる。 According to the present invention, by setting the relationship between the mark and the direction of the battery in advance, the direction of the positive electrode side and the negative electrode side of the battery can be confirmed from the can bottom side. Problems, configurations, and effects other than those described above will be clarified by the following description of the embodiments.
第１実施の形態に係わる角形二次電池の外観斜視図。1 is an external perspective view of a prismatic secondary battery according to a first embodiment. 第１実施の形態に係わる角形二次電池の分解斜視図。The disassembled perspective view of the square secondary battery concerning 1st Embodiment. 捲回電極体の分解斜視図。The exploded perspective view of a wound electrode body. 第１実施の形態に係わる角形二次電池の蓋を示す正面図。The front view which shows the lid | cover of the square secondary battery concerning 1st Embodiment. 第１実施の形態における角形二次電池の一例を示す外観斜視図。The external appearance perspective view which shows an example of the square secondary battery in 1st Embodiment. 図５Ａの角形二次電池の缶底面を示す正面図。The front view which shows the can bottom face of the square secondary battery of FIG. 5A. 図５ＢのＢ－Ｂ線断面図。FIG. 5B is a sectional view taken along line BB in FIG. 5B. 第１実施の形態に係わる組電池の外観斜視図。The external appearance perspective view of the assembled battery concerning 1st Embodiment. 図６に示す組電池のＣ－Ｃ線断面図。FIG. 7 is a cross-sectional view of the assembled battery shown in FIG. 第１実施の形態に係わる組電池の組立方法を説明する斜視図。The perspective view explaining the assembly method of the assembled battery concerning 1st Embodiment. 第２実施の形態に係わる角形二次電池の一例を示す外観斜視図。The external appearance perspective view which shows an example of the square secondary battery concerning 2nd Embodiment. 図９Ａの角形二次電池の缶底面を示す正面図。The front view which shows the can bottom face of the square secondary battery of FIG. 9A. 第３実施の形態に係わる角形二次電池の一例を示す外観斜視図。The external appearance perspective view which shows an example of the square secondary battery concerning 3rd Embodiment. 図１０Ａの角形二次電池の缶底面を示す正面図。FIG. 10B is a front view showing the bottom surface of the prismatic secondary battery of FIG. 10A. 第４実施の形態に係わる角形二次電池の一例を示す外観斜視図。The external appearance perspective view which shows an example of the square secondary battery concerning 4th Embodiment. 図１１Ａの角形二次電池の缶底面を示す正面図。FIG. 11B is a front view showing the bottom surface of the prismatic secondary battery of FIG. 11A. 第５実施の形態に係わる角形二次電池の一例を示す外観斜視図。The external appearance perspective view which shows an example of the square secondary battery concerning 5th Embodiment. 図１２Ａの角形二次電池の缶底面を示す正面図。The front view which shows the can bottom face of the square secondary battery of FIG. 12A. 第６実施の形態に係わる角形二次電池の一例を示す外観斜視図。The external appearance perspective view which shows an example of the square secondary battery concerning 6th Embodiment. 図１３Ａの角形二次電池の缶底面を示す正面図。The front view which shows the can bottom face of the square secondary battery of FIG. 13A.
　次に、本発明の実施の形態について図面を用いて説明する。なお、以下の実施形態では、角形二次電池の一例として、ハイブリッド自動車や電気自動車で使用されるリチウムイオン二次電池の場合について説明する。 Next, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, a case of a lithium ion secondary battery used in a hybrid vehicle or an electric vehicle will be described as an example of a square secondary battery.
＜第１実施の形態＞
　図１は、本実施の形態に係わる角形二次電池の外観斜視図、図２は、本実施形態に係わる角形二次電池の分解斜視図である。 <First embodiment>
FIG. 1 is an external perspective view of a prismatic secondary battery according to the present embodiment, and FIG. 2 is an exploded perspective view of the prismatic secondary battery according to the present embodiment.
　角形二次電池Ｃ１は、電池缶１および蓋（電池蓋）６を備える。電池缶１内には、捲回電極体３が収納され、電池缶１の開口部１００が蓋６によって封口されている。 The rectangular secondary battery C <b> 1 includes a battery can 1 and a lid (battery lid) 6. In the battery can 1, the wound electrode body 3 is accommodated, and the opening 100 of the battery can 1 is sealed by the lid 6.
　角形二次電池Ｃ１の電池缶１は、いわゆる角形であり、矩形の缶底面２２と、缶底面２２から立ち上がる角筒状の側壁面２１と、缶底面２２に対向して側壁面２１の上端で上方に向かって開放された開口部１００とを有している。 The battery can 1 of the prismatic secondary battery C1 has a so-called square shape, a rectangular can bottom 22, a rectangular tubular side wall 21 rising from the can bottom 22, and the upper end of the side wall 21 facing the can bottom 22. And an opening 100 opened upward.
　蓋６は、電池缶１にレーザ溶接により接合されて、これら電池缶１と蓋６によって密閉された電池容器が構成される。蓋６には、正極外部端子８Ａと、負極外部端子８Ｂが設けられている。正極外部端子８Ａと負極外部端子８Ｂは、互いに蓋６の長辺方向両側に離れた位置に配置されている。正極外部端子８Ａと負極外部端子８Ｂを介して捲回電極体３に充電され、また外部負荷に電力が供給される。 The lid 6 is joined to the battery can 1 by laser welding to constitute a battery container sealed by the battery can 1 and the lid 6. The lid 6 is provided with a positive external terminal 8A and a negative external terminal 8B. The positive external terminal 8 </ b> A and the negative external terminal 8 </ b> B are arranged at positions separated from each other on both sides in the long side direction of the lid 6. The wound electrode body 3 is charged via the positive external terminal 8A and the negative external terminal 8B, and power is supplied to the external load.
　次に、図２を参照して、角形二次電池Ｃ１の電池缶１内の構成を説明する。 Next, the configuration in the battery can 1 of the square secondary battery C1 will be described with reference to FIG.
　電池缶１内には、絶縁保護フィルム２を介して捲回電極体３が収容されている。 In the battery can 1, a wound electrode body 3 is accommodated via an insulating protective film 2.
　捲回電極体３は、扁平形状に捲回されているため、断面半円形状の互いに対向する一対の湾曲部と、これら一対の湾曲部の間に連続して形成される平面部とを有している。捲回電極体３は、捲回軸方向が電池缶１の横幅方向に沿うように、一方の湾曲部側から電池缶１内に挿入され、他方の湾曲部側が上部開口側に配置される。 Since the wound electrode body 3 is wound in a flat shape, the wound electrode body 3 has a pair of opposed curved portions having a semicircular cross section and a plane portion formed continuously between the pair of curved portions. is doing. The wound electrode body 3 is inserted into the battery can 1 from one curved portion side so that the winding axis direction is along the lateral width direction of the battery can 1, and the other curved portion side is disposed on the upper opening side.
　捲回電極体３の平面部でかつ電極箔露出部である正極箔接続部３１ｄと負極箔接続部３２ｄは、少なくとも一部が束ねられて平板状とされており、それぞれ正極集電板（集電端子）４Ａの一端と負極集電板（集電端子）４Ｂの一端に重ね合わされて接続されている。 At least a part of the positive electrode foil connection part 31d and the negative electrode foil connection part 32d, which are the flat part of the wound electrode body 3 and the electrode foil exposed part, are bundled into a flat plate shape. (Electrical terminal) 4A and one end of the negative electrode current collector plate (current collecting terminal) 4B are overlapped and connected.
　正極集電板４Ａの他端と負極集電板４Ｂの他端は、正極外部端子８Ａと負極外部端子８Ｂにそれぞれ接続されている。 The other end of the positive current collector 4A and the other end of the negative current collector 4B are connected to the positive external terminal 8A and the negative external terminal 8B, respectively.
　正極集電板４Ａと負極集電板４Ｂ、及び、正極外部端子８Ａと負極外部端子８Ｂを、それぞれ蓋６から電気的に絶縁するために、ガスケット５および絶縁板７が蓋６に設けられている。また、注液口９から電池缶１内に電解液を注入した後、蓋６に注液栓１１をレーザ溶接により接合して注液口９を封止し、角形二次電池Ｃ１を密閉する。 In order to electrically insulate the positive electrode collector plate 4A and the negative electrode collector plate 4B, and the positive electrode external terminal 8A and the negative electrode external terminal 8B from the lid 6, a gasket 5 and an insulating plate 7 are provided on the lid 6, respectively. Yes. Moreover, after pouring electrolyte solution into the battery can 1 from the liquid injection port 9, the liquid injection stopper 11 is joined to the cover 6 by laser welding, the liquid injection port 9 is sealed, and the square secondary battery C1 is sealed. .
　電池缶１及び蓋６の材料には、金属製材料であるアルミニウムまたはアルミニウム合金が用いられる。正極集電板４Ａ及び正極外部端子８Ａの材料には、アルミニウムまたはアルミニウム合金が用いられている。負極集電板４Ｂ及び負極外部端子８Ｂの材料には、銅または銅合金が用いられている。 The material of the battery can 1 and the lid 6 is aluminum or aluminum alloy, which is a metal material. Aluminum or an aluminum alloy is used as a material for the positive electrode current collector plate 4A and the positive electrode external terminal 8A. Copper or copper alloy is used as a material for the negative electrode current collector plate 4B and the negative electrode external terminal 8B.
　正極外部端子８Ａ、負極外部端子８Ｂは、図示していないバスバ等に溶接接合される溶接接合部を有している。溶接接合部は、蓋６から上方に突出する直方体のブロック形状を有しており、下面が蓋６の表面に対向し、上面である端子面８ａ１、８ｂ１が互いに同じ高さ位置で蓋６と平行になる構成を有している。 The positive external terminal 8A and the negative external terminal 8B have weld joints that are welded to a bus bar or the like (not shown). The weld joint has a rectangular parallelepiped block shape protruding upward from the lid 6, the lower surface faces the surface of the lid 6, and the terminal surfaces 8 a 1 and 8 b 1 which are the upper surfaces are at the same height position as the lid 6. It has the structure which becomes parallel.
　正極接続部１２Ａ、負極接続部１２Ｂは、正極外部端子８Ａ、負極外部端子８Ｂの下面からそれぞれ突出して先端が蓋６の正極側貫通孔６Ａ、負極側貫通孔６Ｂに挿入可能な円柱形状を有している。正極接続部１２Ａ、負極接続部１２Ｂは、蓋６を貫通して正極集電板４Ａ、負極集電板４Ｂの正極集電板基部４１Ａ、負極集電板基部４１Ｂよりも電池缶１の内部側に突出しており、先端がかしめられて、正極外部端子８Ａ、負極外部端子８Ｂと、正極集電板４Ａ、負極集電板４Ｂを蓋６に一体に固定している。正極外部端子８Ａ、負極外部端子８Ｂと蓋６との間には、ガスケット５が介在されており、正極集電板４Ａ、負極集電板４Ｂと蓋６との間には、絶縁板７が介在されている。 The positive electrode connecting portion 12A and the negative electrode connecting portion 12B have cylindrical shapes that protrude from the lower surfaces of the positive electrode external terminal 8A and the negative electrode external terminal 8B, respectively, and can be inserted into the positive electrode side through hole 6A and the negative electrode side through hole 6B. is doing. 12 A of positive electrode connection parts and the negative electrode connection part 12B penetrate the cover 6, and are inside the battery can 1 rather than the positive electrode current collecting plate base 41A of the positive electrode current collecting plate 4A and the negative electrode current collecting plate 4B, and the negative electrode current collecting plate base 41B. The positive electrode external terminal 8A, the negative electrode external terminal 8B, the positive electrode current collector plate 4A, and the negative electrode current collector plate 4B are integrally fixed to the lid 6. A gasket 5 is interposed between the positive electrode external terminal 8A and the negative electrode external terminal 8B and the lid 6, and an insulating plate 7 is interposed between the positive electrode current collector plate 4A, the negative electrode current collector plate 4B and the lid 6. Intervened.
　正極集電板４Ａ、負極集電板４Ｂは、蓋６の下面に対向して配置される矩形板状の正極集電板基部４１Ａ、負極集電板基部４１Ｂと、正極集電板基部４１Ａ、負極集電板基部４１Ｂの側端で折曲されて、電池缶１の幅広面に沿って底面側に向かって延出し、捲回電極体３の正極箔接続部３１ｄ、負極箔接続部３２ｄに対向して重ね合わされた状態で接続される正極側接続端部４２Ａ、負極側接続端部４２Ｂを有している。正極集電板基部４１Ａ、負極集電板基部４１Ｂには、正極接続部１２Ａ、負極接続部１２Ｂが挿通される正極側開口穴４３Ａ、負極側開口穴４３Ｂがそれぞれ形成されている。 The positive electrode current collector plate 4A and the negative electrode current collector plate 4B are a rectangular plate-shaped positive electrode current collector plate base portion 41A, a negative electrode current collector plate base portion 41B, a positive electrode current collector plate base portion 41A, which are disposed to face the lower surface of the lid 6. It is bent at the side end of the negative electrode current collector base 41B and extends toward the bottom surface along the wide surface of the battery can 1 to the positive electrode foil connection part 31d and the negative electrode foil connection part 32d of the wound electrode body 3. It has a positive electrode side connection end portion 42A and a negative electrode side connection end portion 42B which are connected in a state of being overlapped facing each other. The positive electrode collector plate base 41A and the negative electrode collector plate base 41B are respectively formed with a positive electrode side opening hole 43A and a negative electrode side opening hole 43B through which the positive electrode connecting part 12A and the negative electrode connecting part 12B are inserted.
　図３は、捲回電極体の一部を展開した状態を示す分解斜視図である。 FIG. 3 is an exploded perspective view showing a state in which a part of the wound electrode body is developed.
　捲回電極体３は、セパレータ３３を介して正極体３１と負極体３２を扁平形状に捲回した電極体であり、捲回軸方向の両端面側には、正極合剤３１ｂおよび負極合剤３２ｂが塗布されていない正極箔露出部３１ｃ、負極箔露出部３２ｃが設けられている。捲回電極体３は、最外周の電極体が負極体３２であり、さらにその外側にセパレータ３３が捲回される。そして、セパレータ３３の捲き終わりが、図示していない粘着テープによってセパレータ３３の最外周面に固定されて、捲回状態を保持している。なお、セパレータ３３の捲き終わりは、捲回電極体３の一方の扁平面上の略中央位置に配置されており、捲回軸方向中央部分が粘着テープ（図示せず）により固定されている。セパレータ３３は、正極体３１と負極体３２を絶縁する役割を有している。 The wound electrode body 3 is an electrode body obtained by winding a positive electrode body 31 and a negative electrode body 32 in a flat shape with a separator 33 interposed therebetween, and a positive electrode mixture 31b and a negative electrode mixture are provided on both end surfaces in the winding axis direction. A positive foil exposed portion 31c and a negative foil exposed portion 32c that are not coated with 32b are provided. In the wound electrode body 3, the outermost electrode body is the negative electrode body 32, and the separator 33 is wound further outside. The end of the separator 33 is fixed to the outermost peripheral surface of the separator 33 with an adhesive tape (not shown), and the wound state is maintained. The winding end of the separator 33 is disposed at a substantially central position on one flat surface of the wound electrode body 3, and the central portion in the winding axis direction is fixed by an adhesive tape (not shown). The separator 33 has a role of insulating the positive electrode body 31 and the negative electrode body 32.
　負極体３２の負極合剤３２ｂは、正極体３１の正極合剤３１ｂよりも幅方向に大きく、これにより、正極合剤３１ｂは、必ず負極合剤３２ｂに挟まれるように構成されている。正極体３１は、正極箔３１ａの両面に正極合剤３１ｂを塗布したものであり、正極箔３１ａの幅方向一方側には、未塗布の正極箔露出部３１ｃを持つ。負極体３２は、負極箔３２ａの両面に負極合剤３２ｂを塗布したものであり、負極箔３２ａの幅方向他方側には、未塗布の負極箔露出部３２ｃを持つ。正極箔露出部３１ｃと負極箔露出部３２ｃは、それぞれ捲回軸方向において反対側に位置するように捲回される。 The negative electrode mixture 32b of the negative electrode body 32 is larger in the width direction than the positive electrode mixture 31b of the positive electrode body 31, and thus the positive electrode mixture 31b is configured to be sandwiched between the negative electrode mixture 32b without fail. The positive electrode body 31 is obtained by applying a positive electrode mixture 31b on both surfaces of a positive electrode foil 31a, and has an uncoated positive electrode foil exposed portion 31c on one side in the width direction of the positive electrode foil 31a. The negative electrode body 32 is obtained by applying a negative electrode mixture 32b on both surfaces of a negative electrode foil 32a, and has an uncoated negative electrode foil exposed portion 32c on the other side in the width direction of the negative electrode foil 32a. The positive electrode foil exposed portion 31c and the negative electrode foil exposed portion 32c are wound so as to be positioned on opposite sides in the winding axis direction.
　正極箔３１ａは、厚さ２０～３０μｍ程度のアルミニウム合金箔であり、負極箔３２ａは、厚さ１５～２０μｍ程度の銅合金箔である。セパレータ３３の素材は多孔質のポリエチレン樹脂である。正極活物質は、マンガン酸リチウム等のリチウム含有遷移金属複酸化物であり、負極活物質は、リチウムイオンを可逆に吸蔵、放出可能な黒鉛等の炭素材である。 The positive foil 31a is an aluminum alloy foil having a thickness of about 20 to 30 μm, and the negative foil 32a is a copper alloy foil having a thickness of about 15 to 20 μm. The material of the separator 33 is a porous polyethylene resin. The positive electrode active material is a lithium-containing transition metal double oxide such as lithium manganate, and the negative electrode active material is a carbon material such as graphite capable of reversibly occluding and releasing lithium ions.
　図４は、第１実施の形態に係わる角形二次電池の蓋を示す正面図である。 FIG. 4 is a front view showing the lid of the prismatic secondary battery according to the first embodiment.
　蓋６は、電池缶１の開口部１００を閉塞する大きさを有する長方形の薄板平板部材により構成されている。蓋６には、ガス排出弁１０が一体的に設けられており、電池容器内の圧力が上昇すると、ガス排出弁１０が開いて内部からガスが排出され、電池容器内の圧力が低減される。これによって、角形二次電池Ｃ１の安全性が確保される。ガス排出弁１０は、蓋６の正極外部端子８Ａと負極外部端子８Ｂとの間の中間位置に配置されている。 The lid 6 is composed of a rectangular thin plate member having a size for closing the opening 100 of the battery can 1. The lid 6 is integrally provided with a gas discharge valve 10, and when the pressure in the battery container rises, the gas discharge valve 10 opens to discharge gas from the inside, and the pressure in the battery container is reduced. . Thereby, the safety of the square secondary battery C1 is ensured. The gas discharge valve 10 is arranged at an intermediate position between the positive external terminal 8A and the negative external terminal 8B of the lid 6.
　ガス排出弁１０は、蓋６の板厚を他の部分よりも薄くすることによって形成された矩形の薄肉面部１０ａと、薄肉面部１０ａの周縁部及び対角線に沿ってさらに厚さが薄く形成された開裂溝１０ｂとによって構成されている。 The gas discharge valve 10 has a rectangular thin wall surface portion 10a formed by making the plate thickness of the lid 6 thinner than other portions, and is formed to be thinner along the peripheral edge portion and the diagonal line of the thin wall surface portion 10a. It is comprised by the cleavage groove | channel 10b.
　図５Ａは、本実施の形態における角形二次電池の一例を示す外観斜視図、図５Ｂは、図５Ａの角形二次電池の缶底面を示す正面図、図５Ｃは、図５ＢのＢ－Ｂ線断面図である。　
　角形二次電池Ｃ１は、図５Ａ及び図５Ｂに示すように、缶底面２２に設けられた目印５０を有している。目印５０は、缶底面２２の長辺に直交する第１中心線ＬＣ１と、缶底面２２の短辺方向に直交する第２中心線ＬＣ２の少なくとも一方を基準とした非対称の形状を有しており、本実施の形態では、目印５０は、第１中心線ＬＣ１を基準とした非対称の形状を有し、第２中心線ＬＣ２を基準とした対称の形状を有している。 5A is an external perspective view showing an example of the prismatic secondary battery in the present embodiment, FIG. 5B is a front view showing the bottom surface of the prismatic secondary battery of FIG. 5A, and FIG. 5C is a cross-sectional view taken along line BB of FIG. It is line sectional drawing.
As shown in FIGS. 5A and 5B, the prismatic secondary battery C1 has a mark 50 provided on the bottom surface 22 of the can. The mark 50 has an asymmetric shape based on at least one of the first center line LC1 orthogonal to the long side of the can bottom surface 22 and the second center line LC2 orthogonal to the short side direction of the can bottom surface 22. In this embodiment, the mark 50 has an asymmetric shape with respect to the first center line LC1 and a symmetrical shape with respect to the second center line LC2.
　目印５０は正極外部端子８Ａまたは負極外部端子８Ｂの配置を示す目印であり、また、正極外部端子８Ａまたは負極外部端子８Ｂの極性を示す目印である。第１中心線ＬＣ１は、缶底面２２の長辺方向中央位置で長辺に直交する方向に延在し、第２中心線ＬＣ２は、缶底面２２の短辺方向中央位置で短辺に直交する方向に延在するように設定されている。なお、説明の便宜上、図５Ｂには第１中心線ＬＣ１と第２中心線ＬＣ２を示しているが、実際には、図５Ａに示すように、第１中心線ＬＣ１と第２中心線ＬＣ２の表示はない。 The mark 50 is a mark indicating the arrangement of the positive electrode external terminal 8A or the negative electrode external terminal 8B, and the mark indicating the polarity of the positive electrode external terminal 8A or the negative electrode external terminal 8B. The first center line LC1 extends in the direction perpendicular to the long side at the center position in the long side direction of the can bottom surface 22, and the second center line LC2 is orthogonal to the short side in the center position in the short side direction of the can bottom surface 22. It is set to extend in the direction. For convenience of explanation, FIG. 5B shows the first center line LC1 and the second center line LC2, but actually, as shown in FIG. 5A, the first center line LC1 and the second center line LC2 There is no indication.
　目印５０は、刻印によって構成されており、＋の形状を有する刻印５１と、－の形状を有する刻印５２を有している。刻印５１は、正極外部端子８Ａを示す目印となるものであり、缶底面２２の正極側の端部に設けられている。刻印５２は、負極外部端子８Ｂを示す目印となるものであり、缶底面２２の負極側の端部に設けられている。刻印５１、５２は、例えばプレス成形やレーザ加工などによって缶底面２２に形成される。 The mark 50 is constituted by a mark, and has a mark 51 having a + shape and a mark 52 having a − shape. The inscription 51 serves as a mark indicating the positive electrode external terminal 8A, and is provided at the end of the can bottom 22 on the positive electrode side. The inscription 52 serves as a mark indicating the negative electrode external terminal 8B, and is provided at the end of the can bottom 22 on the negative electrode side. The markings 51 and 52 are formed on the bottom surface 22 of the can by, for example, press molding or laser processing.
　缶底面２２の目印５０が設けられている部分の肉厚は、蓋６のガス排出弁１０が設けられている部分である開裂溝１０ｂの肉厚よりも厚くなっている。したがって、電池内部の圧力が所定圧よりも上昇した場合に、ガス排出弁１０の開裂溝１０ｂを容易かつ優先的に開裂させることができ、刻印５２で開裂するのを防ぐことができる。 The thickness of the portion of the can bottom 22 where the mark 50 is provided is thicker than the thickness of the cleavage groove 10b where the gas discharge valve 10 of the lid 6 is provided. Therefore, when the internal pressure of the battery rises above a predetermined pressure, the cleavage groove 10b of the gas discharge valve 10 can be easily and preferentially cleaved, and can be prevented from being cleaved at the marking 52.
　刻印５１、５２をプレス成形によって形成する場合は、電池缶１をプレス成形する製造工程中に同時に形成することができる。刻印５１、５２は、例えば缶底面２２の外側をプレス型によって凹ますことによって形成することができる。その際、図５Ｃに示すように、缶底面２２の内側に、凹みに応じた形状を有する凸部を形成することによって、凹みによる余肉が缶底面２２の外側に突出するのを防ぐことができる。したがって、後述するように、組電池Ｃ２として缶底面２２に冷却プレートを当接させた際に、缶底面２２の全面に亘って冷却プレートを接面させることができ、高い冷却効率を得ることができる。 When the stamps 51 and 52 are formed by press molding, they can be formed simultaneously during the manufacturing process of press-molding the battery can 1. The stamps 51 and 52 can be formed, for example, by denting the outside of the can bottom 22 with a press die. At this time, as shown in FIG. 5C, by forming a convex portion having a shape corresponding to the recess on the inner side of the can bottom surface 22, it is possible to prevent the surplus meat due to the recess from protruding outside the can bottom surface 22. it can. Therefore, as will be described later, when the cooling plate is brought into contact with the bottom surface 22 of the can as the assembled battery C2, the cooling plate can be brought into contact with the entire surface of the bottom surface 22, thereby obtaining high cooling efficiency. it can.
　また、缶底面２２の内側に凹みに応じた形状を有する凸部を形成することによって、缶底面２２の厚みｔを刻印５１、５２とその周囲とで同じ厚さにすることができる。したがって、ガス排出弁１０のように部分的に薄くなってはいないので、缶底面２２の強度を全面に亘ってほぼ一定にすることができる。 Further, by forming a convex portion having a shape corresponding to the dent on the inside of the can bottom 22, the thickness t of the can bottom 22 can be made the same between the stamps 51 and 52 and the periphery thereof. Therefore, since the gas exhaust valve 10 is not partially thinned, the strength of the bottom surface 22 of the can can be made almost constant over the entire surface.
　刻印５１、５２をレーザ加工によって形成する場合には、余肉等が缶底面２２の外側に突出するのを防ぐことができるという効果に加えて、角形二次電池Ｃ１を組み立てた後にも付すことができるという効果を有する。 When the marks 51 and 52 are formed by laser processing, in addition to the effect that it is possible to prevent the surplus or the like from protruding outside the bottom surface 22 of the can, the markings 51 and 52 are also attached after the prismatic secondary battery C1 is assembled. Has the effect of being able to.
　本実施の形態では、＋（プラス）および－（マイナス）の刻印５１および刻印５２を正極外部端子８Ａおよび負極外部端子８Ｂのそれぞれに配しているが、これに限定されるものではなく、目印５０は、電池の正極側と負極側の向きを缶底側から判別することが可能な非対称の形状を有するものであれば良い。なお、上記した目印５０の視認方法は、作業者の目視に限定されるものではなく、カメラなどの視覚装置によるものも含まれる。 In the present embodiment, the + (plus) and-(minus) markings 51 and 52 are arranged on each of the positive external terminal 8A and the negative external terminal 8B. However, the present invention is not limited to this. 50 should just have the asymmetrical shape which can discriminate | determine the direction of the positive electrode side and negative electrode side of a battery from a can bottom side. In addition, the visual recognition method of the above-mentioned mark 50 is not limited to an operator's visual observation, The thing by visual devices, such as a camera, is also included.
　本実施の形態に係わる角形二次電池Ｃ１によれば、缶底面２２に設けられている目印５０を見ることによって、缶底側から電池の正極側と負極側の向きを確認できる。したがって、例えば角形二次電池Ｃ１の缶底面２２のみが視認できる状況においても、誤って電池の向きを反対側に配置するのを防ぐことができる。 According to the rectangular secondary battery C1 according to the present embodiment, the orientation of the positive electrode side and the negative electrode side of the battery can be confirmed from the bottom side by looking at the mark 50 provided on the bottom surface 22 of the can. Therefore, for example, even in a situation where only the bottom surface 22 of the prismatic secondary battery C1 can be visually recognized, it is possible to prevent the battery from being erroneously disposed on the opposite side.
　また、蓋６には、正極外部端子８Ａ、負極外部端子８Ｂ、ガス排出弁１０、注液口９、注液栓１１等の多くの部品が設けられており、空いているスペースが狭く、大きな目印を設けることができないが、缶底面２２には、部品が設けられておらず、大きな目印を設けやすい。したがって、蓋６に設ける場合と比較して、目印を視認しやすくできるという、缶底面２２に設けた際の特有の作用効果を有する。 Further, the lid 6 is provided with many components such as the positive electrode external terminal 8A, the negative electrode external terminal 8B, the gas discharge valve 10, the liquid injection port 9, and the liquid injection plug 11, and the vacant space is narrow and large. Although a mark cannot be provided, no parts are provided on the bottom surface 22 of the can, and it is easy to provide a large mark. Therefore, compared with the case where it is provided on the lid 6, it has a characteristic effect when it is provided on the bottom surface 22 of the can so that the mark can be easily recognized.
　図６は、本実施の形態に係わる組電池の外観斜視図、図７は、図６のＣ－Ｃ線断面図、図８は、本実施の形態に係わる組電池の組立方法を説明する斜視図である。 6 is an external perspective view of the assembled battery according to the present embodiment, FIG. 7 is a cross-sectional view taken along the line CC of FIG. 6, and FIG. 8 is a perspective view for explaining the assembled method of the assembled battery according to the present embodiment. FIG.
　組電池Ｃ２は、複数の角形二次電池Ｃ１をそれぞれの間にスペーサ７０を介して電池厚さ方向に積層配列し、図示していない一対のエンドプレートと一対のサイドプレートを用いて固縛することによって組み立てられる。 The assembled battery C2 includes a plurality of rectangular secondary batteries C1 stacked and arranged in the battery thickness direction via spacers 70 between them, and is secured using a pair of end plates and a pair of side plates (not shown). Assembled by.
　スペーサ７０は、例えば絶縁性の合成樹脂製材料からなり、複数の角形二次電池Ｃ１の間に介在されて側壁面２１の幅広面に対向する平板状の基板部７１と、基板部７１の幅方向両端から配列方向に沿って互いに離反する方向に突出して角形二次電池Ｃ１の側壁面２１の幅狭面に対向する一対の側板部７２と、基板部７１の高さ方向一方側から配列方向に沿って互いに離反する方向に突出して角形二次電池Ｃ１の蓋６に対向する天板部７３とを有している。 The spacer 70 is made of, for example, an insulating synthetic resin material. The spacer 70 is interposed between the plurality of rectangular secondary batteries C <b> 1 and faces the wide surface of the side wall surface 21, and the width of the substrate portion 71. A pair of side plate portions 72 projecting in the direction away from each other along the arrangement direction from both ends in the direction and facing the narrow surface of the side wall surface 21 of the prismatic secondary battery C1, and the arrangement direction from one side in the height direction of the substrate portion 71 And a top plate portion 73 that protrudes in a direction away from each other and faces the lid 6 of the rectangular secondary battery C1.
　天板部７３には、角形二次電池Ｃ１の蓋６の蓋面を天板部７３の内面に接面させた状態で角形二次電池Ｃ１の正極外部端子８Ａ及び負極外部端子８Ｂが挿通される切り欠き部が設けられている。各スペーサ７０は、図７に示すように、角形二次電池Ｃ１を間に挟み込むことにより、正極外部端子８Ａと負極外部端子８Ｂを天板部７３から突出させた状態に保持する。 The top plate part 73 is inserted with the positive external terminal 8A and the negative external terminal 8B of the square secondary battery C1 with the cover surface of the cover 6 of the square secondary battery C1 in contact with the inner surface of the top plate part 73. A notch is provided. As shown in FIG. 7, each spacer 70 holds the positive external terminal 8 </ b> A and the negative external terminal 8 </ b> B in a state of protruding from the top plate portion 73 by sandwiching the square secondary battery C <b> 1 therebetween.
　組電池Ｃ２は、スペーサ７０の基板部７１を角形二次電池Ｃ１の幅広面に当接させ、スペーサ７０の側板部７２を角形二次電池Ｃ１の幅狭面に対向させて配列方向両側から押さえることで角形二次電池Ｃ１を保持している。 In the assembled battery C2, the substrate portion 71 of the spacer 70 is brought into contact with the wide surface of the rectangular secondary battery C1, and the side plate portion 72 of the spacer 70 is opposed to the narrow surface of the rectangular secondary battery C1 and pressed from both sides in the arrangement direction. Thus, the rectangular secondary battery C1 is held.
　角形二次電池Ｃ１は、図６に示すように、互いに隣り合う角形二次電池Ｃ１と電気的に直列接続できるように、正極外部端子８Ａおよび負極外部端子８Ｂが交互に配置される。そして、互いに隣り合う角形二次電池Ｃ１のうち、一方の角形二次電池Ｃ１が有する正極外部端子８Ａと他方の角形二次電池Ｃ１が有する負極外部端子８Ｂとの間にバスバが架け渡されて、端子面８ａ１、８ｂ１に接面した状態で溶接されて直列に接続される。各角形二次電池Ｃ１の缶底面２２は、図６に示すように、角形二次電池Ｃ１の配列方向に直交する方向である組電池Ｃ２の一方面に露出しており、例えば図示していない冷却プレートに接面されて冷却される。 As shown in FIG. 6, in the rectangular secondary battery C1, positive external terminals 8A and negative external terminals 8B are alternately arranged so as to be electrically connected in series to adjacent rectangular secondary batteries C1. And among the square secondary batteries C1 adjacent to each other, a bus bar is bridged between the positive electrode external terminal 8A of one square secondary battery C1 and the negative electrode external terminal 8B of the other square secondary battery C1. The terminal surfaces 8a1 and 8b1 are welded and connected in series in contact with the terminal surfaces 8a1 and 8b1. As shown in FIG. 6, the bottom surface 22 of each rectangular secondary battery C1 is exposed on one surface of the assembled battery C2, which is a direction orthogonal to the arrangement direction of the rectangular secondary batteries C1, and is not illustrated, for example. It is cooled by contacting the cooling plate.
　図７に示すように、複数の角形二次電池Ｃ１からなる組電池Ｃ２は、角形二次電池Ｃ１の蓋６の蓋面を基準として組み立てられることがある。 As shown in FIG. 7, the assembled battery C2 composed of a plurality of prismatic secondary batteries C1 may be assembled on the basis of the lid surface of the lid 6 of the prismatic secondary battery C1.
　その他の基準面として缶底面２２が考えられるが、缶底面２２を基準とした場合、電池缶１の寸法、蓋６の寸法のばらつきにより、端子面８ａ１、８ｂ１の電池高さ方向の位置ばらつきが大きくなり、角形二次電池Ｃ１間を電気的に接続するバスバ（図示せず）と正極外部端子８Ａおよび負極外部端子８Ｂとの溶接が安定しない可能性がある。 The bottom surface 22 of the can is considered as another reference surface. However, when the bottom surface 22 is used as a reference, variations in the position of the terminal surfaces 8a1 and 8b1 in the battery height direction are caused by variations in the dimensions of the battery can 1 and the lid 6. There is a possibility that the welding between the bus bar (not shown) for electrically connecting the rectangular secondary batteries C1 to the positive external terminal 8A and the negative external terminal 8B becomes unstable.
　これに対して、図７に示す蓋６の蓋面を基準とした組電池Ｃ２の組み立て方法は、端子面８ａ１、８ｂ１の電池高さ方向の位置ばらつきを抑えることができ、バスバと正極外部端子８Ａおよび負極外部端子８Ｂとの溶接が安定する。 On the other hand, the method of assembling the assembled battery C2 with reference to the lid surface of the lid 6 shown in FIG. 7 can suppress variations in the position of the terminal surfaces 8a1 and 8b1 in the battery height direction. 8A and the negative electrode external terminal 8B are stably welded.
　しかしながら、蓋６の蓋面を基準として組み立てる方法の場合、図８に示すように蓋面を下にして角形二次電池Ｃ１を組み込むため、正極外部端子８Ａおよび負極外部端子８Ｂを視認することが出来ず、正極外部端子８Ａおよび負極外部端子８Ｂの挿入方向を間違える可能性がある。 However, in the case of the method of assembling with the lid surface of the lid 6 as a reference, since the rectangular secondary battery C1 is incorporated with the lid surface down as shown in FIG. 8, the positive external terminal 8A and the negative external terminal 8B can be visually recognized. There is a possibility that the insertion direction of the positive external terminal 8A and the negative external terminal 8B is wrong.
　このような課題に対して、本実施の形態に係わる角形二次電池Ｃ１は、缶底面２２の外側に正極外部端子８Ａおよび負極外部端子８Ｂの配置および極性を示す目印５０として刻印５１および刻印５２が設けられているので、缶底側から極性を確認することができ、電池の正極側と負極側の向きを容易に確認することができる。したがって、外部端子の挿入方向を誤ることなく組電池Ｃ２を組み立てることができる。 In response to such a problem, the prismatic secondary battery C1 according to the present embodiment has a marking 51 and a marking 52 as marks 50 indicating the arrangement and polarity of the positive external terminal 8A and the negative external terminal 8B on the outside of the bottom surface 22 of the can. Since the polarity is provided, the polarity can be confirmed from the can bottom side, and the orientation of the positive electrode side and the negative electrode side of the battery can be easily confirmed. Therefore, the assembled battery C <b> 2 can be assembled without mistaking the external terminal insertion direction.
＜第２実施の形態＞
　以下に本発明の第２実施の形態について説明する。 <Second Embodiment>
The second embodiment of the present invention will be described below.
　図９Ａは、第２実施の形態に係わる角形二次電池の一例を示す外観斜視図、図９Ｂは、図９Ａの角形二次電池の缶底面を示す正面図である。なお、第１実施の形態と同様の構成要素には同一の符号を付することでその詳細な説明を省略する。 FIG. 9A is an external perspective view showing an example of the prismatic secondary battery according to the second embodiment, and FIG. 9B is a front view showing the bottom surface of the prismatic secondary battery of FIG. 9A. The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
　本実施の形態において特徴的なことは、目印５０を、極性を示す記号の形状ではなく、円形や四角形などの単なる幾何学的な形状としたことである。 What is characteristic in the present embodiment is that the mark 50 is not a shape of a symbol indicating polarity but a simple geometric shape such as a circle or a rectangle.
　図９Ａおよび図９Ｂに示すように、電池缶１の缶底面２２の外側には正極外部端子８Ａおよび負極外部端子８Ｂを示す刻印５３および刻印５４からなる目印５０が設けられている。刻印５３、５４は、缶底面２２の長辺に直交する第１中心線ＬＣ１を基準とした非対称な形状を有し、缶底面２２の短辺に直交する第２中心線ＬＣ２を基準とした対称な形状を有している。 As shown in FIGS. 9A and 9B, a mark 50 including a mark 53 and a mark 54 indicating the positive electrode external terminal 8A and the negative electrode external terminal 8B is provided on the outside of the bottom surface 22 of the battery can 1. The engravings 53 and 54 have an asymmetric shape with respect to the first center line LC1 orthogonal to the long side of the can bottom surface 22, and are symmetrical with respect to the second center line LC2 orthogonal to the short side of the can bottom surface 22. It has a different shape.
　刻印５３、５４は、正極外部端子８Ａまたは負極外部端子８Ｂの配置を示す目印であり、また、正極外部端子８Ａまたは負極外部端子８Ｂの極性を示す目印である。円形の刻印５３は正極側を示し、四角形の刻印５４は負極側を示すように、目印５０の形状種類と電池の向きとの関係が予め設定されている。したがって、電池の幅方向一方側と他方側のいずれが正極側もしくは負極側であるか、その電池の向きを缶底側から確認できる。 The marks 53 and 54 are marks indicating the arrangement of the positive external terminal 8A or the negative external terminal 8B, and are marks indicating the polarity of the positive external terminal 8A or the negative external terminal 8B. The relationship between the shape type of the mark 50 and the direction of the battery is preset so that the circular mark 53 indicates the positive electrode side and the square mark 54 indicates the negative electrode side. Therefore, it can be confirmed from the bottom of the can whether the one side or the other side in the width direction of the battery is the positive electrode side or the negative electrode side.
　本実施の形態では、目印５０として、正極外部端子８Ａ側に円形の刻印５３、負極外部端子８Ｂ側に四角形の刻印５４を設けているが、刻印の形状は、円形や四角形に限定されるものではなく、正極外部端子８Ａおよび負極外部端子８Ｂを缶底側から判別することが可能な非対称の形状を有するものであれば良い。 In the present embodiment, as the mark 50, a circular stamp 53 is provided on the positive electrode external terminal 8A side and a square stamp 54 is provided on the negative electrode external terminal 8B side. However, the shape of the stamp is limited to a circle or a rectangle. Instead, the positive electrode external terminal 8A and the negative electrode external terminal 8B may have any asymmetric shape that can be distinguished from the can bottom side.
　本実施の形態に係わる角形二次電池Ｃ１によれば、缶底面２２に設けられている目印５０を見ることによって、缶底側から電池の正極側と負極側の向きを確認できる。したがって、例えば角形二次電池Ｃ１の缶底面２２のみが視認できる状況においても、誤って電池の向きを反対側に配置するのを防ぐことができる。 According to the rectangular secondary battery C1 according to the present embodiment, the orientation of the positive electrode side and the negative electrode side of the battery can be confirmed from the bottom side by looking at the mark 50 provided on the bottom surface 22 of the can. Therefore, for example, even in a situation where only the bottom surface 22 of the prismatic secondary battery C1 can be visually recognized, it is possible to prevent the battery from being erroneously disposed on the opposite side.
＜第３実施の形態＞
　以下に本発明の第３実施の形態について説明する。 <Third Embodiment>
The third embodiment of the present invention will be described below.
　図１０Ａは、第３実施の形態に係わる角形二次電池の一例を示す外観斜視図、図１０Ｂは、図１０Ａの角形二次電池の缶底面を示す正面図である。なお、上述の各実施の形態と同様の構成要素には同一の符号を付することでその詳細な説明を省略する。 FIG. 10A is an external perspective view showing an example of a prismatic secondary battery according to the third embodiment, and FIG. 10B is a front view showing a bottom surface of the prismatic secondary battery of FIG. 10A. Note that the same components as those in the above-described embodiments are given the same reference numerals, and detailed description thereof is omitted.
　本実施の形態において特徴的なことは、目印５０を缶底面２２の外側に印刷することにより設けたことである。 A characteristic feature of the present embodiment is that the mark 50 is provided by printing on the outside of the bottom surface 22 of the can.
　図１０Ａおよび図１０Ｂに示すように、電池缶１の缶底面２２の外側には正極外部端子８Ａおよび負極外部端子８Ｂを示す印刷表示５５および印刷表示５６からなる目印５０が設けられている。缶底面２２の目印５０が設けられている部分の肉厚は、蓋６のガス排出弁１０の開裂溝１０ｂの肉厚よりも厚くなっている。 As shown in FIGS. 10A and 10B, a mark 50 including a printed display 55 and a printed display 56 indicating the positive electrode external terminal 8 </ b> A and the negative electrode external terminal 8 </ b> B is provided outside the bottom surface 22 of the battery can 1. The thickness of the portion provided with the mark 50 on the bottom surface 22 of the can is thicker than the thickness of the cleavage groove 10 b of the gas discharge valve 10 of the lid 6.
　印刷表示５５、５６は、缶底面２２の長辺に直交する第１中心線ＬＣ１を基準とした非対称な形状を有し、缶底面２２の短辺に直交する第２中心線ＬＣ２を基準とした対称な形状を有している。印刷表示５５、５６は、正極外部端子８Ａまたは負極外部端子８Ｂの配置を示す目印であり、また、正極外部端子８Ａまたは負極外部端子８Ｂの極性を示す目印である。 The print indications 55 and 56 have an asymmetric shape with respect to the first center line LC1 orthogonal to the long side of the can bottom surface 22, and are based on the second center line LC2 orthogonal to the short side of the can bottom surface 22. It has a symmetrical shape. The print displays 55 and 56 are marks indicating the arrangement of the positive external terminal 8A or the negative external terminal 8B, and are marks indicating the polarity of the positive external terminal 8A or the negative external terminal 8B.
　本実施形態では、正極外部端子８Ａ側に＋（プラス）の印刷表示５５、負極外部端子８Ｂ側に－（マイナス）の印刷表示５６を配しているが、これに限定されるものではなく、目印５０は、正極外部端子８Ａおよび負極外部端子８Ｂを缶底側から判別することが可能な非対称の形状を有する印刷表示であれば良い。したがって、極性を示す印刷表示５５、５６の代わりに、例えば第２実施の形態のように、円形や四角形等の幾何学的な形状を有する印刷表示としてもよい。 In the present embodiment, a + (plus) print display 55 is arranged on the positive electrode external terminal 8A side, and a-(minus) print display 56 is arranged on the negative electrode external terminal 8B side. However, the present invention is not limited to this. The mark 50 may be a printed display having an asymmetric shape capable of distinguishing the positive external terminal 8A and the negative external terminal 8B from the bottom side. Therefore, instead of the print displays 55 and 56 indicating the polarity, for example, as in the second embodiment, a print display having a geometric shape such as a circle or a quadrangle may be used.
　なお、印刷表示５５、５６の印刷は、凹版印刷や凸版印刷などの有版印刷、インクジェット印刷やレーザ印刷など無版印刷など、公知の方法によって行うことができる。 The printing indications 55 and 56 can be printed by known methods such as plate printing such as intaglio printing and letterpress printing, and plateless printing such as ink jet printing and laser printing.
　本実施の形態によれば、電池缶１が部品単体の状態で目印５０を付すことができ、また、角形二次電池Ｃ１を組み立てた後で付すこともできる。また、刻印をプレス成形等で設けた場合と比較して、余肉等が缶底面２２の外側に突出するのを防ぐことができるという効果を有する。また、目印５０としての印刷表示５５、５６は、第１及び第２実施の形態における刻印と比較して簡単に付すことができ、低コスト化を図ることができる。 According to the present embodiment, the battery can 1 can be attached with the mark 50 in the state of a single component, and can also be attached after the prismatic secondary battery C1 is assembled. Moreover, compared with the case where a stamp is provided by press molding etc., it has the effect that it can prevent surplus meat etc. protruding outside the can bottom 22. Further, the print indications 55 and 56 as the marks 50 can be easily added as compared with the marks in the first and second embodiments, and the cost can be reduced.
＜第４実施の形態＞
　以下に本発明の第４実施の形態について説明する。 <Fourth embodiment>
The fourth embodiment of the present invention will be described below.
　図１１Ａは、第４実施の形態に係わる角形二次電池の一例を示す外観斜視図、図１１Ｂは、図１１Ａの角形二次電池の缶底面を示す正面図である。なお、第１実施の形態と同様の構成要素には同一の符号を付することでその詳細な説明を省略する。 FIG. 11A is an external perspective view showing an example of a prismatic secondary battery according to the fourth embodiment, and FIG. 11B is a front view showing a bottom surface of the prismatic secondary battery of FIG. 11A. The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
　本実施の形態において特徴的なことは、第１中心線ＬＣ１を基準として缶底面２２の長辺方向一方側のみに目印５０を設けたことである。 A characteristic feature of the present embodiment is that a mark 50 is provided only on one side in the long side direction of the bottom surface 22 with respect to the first center line LC1.
　図１１Ａおよび図１１Ｂに示すように、電池缶１の缶底面２２の外側には正極外部端子８Ａまたは負極外部端子８Ｂのいずれか一方を示す刻印５７からなる目印５０が設けられている。刻印５７は、第１中心線ＬＣ１を基準とした非対称な形状を有し、第２中心線ＬＣ２を基準とした対称な形状を有している。
　また、刻印５７は、正極外部端子８Ａまたは負極外部端子８Ｂの配置を示す目印であり、また、正極外部端子８Ａまたは負極外部端子８Ｂの極性を示す目印である。本実施の形態に係わる角形二次電池Ｃ１によれば、上述の各実施形態と比較して、刻印５７の数を１個に減らすことができるので、工数削減による低コスト化を図ることができる。 As shown in FIGS. 11A and 11B, a mark 50 made of a mark 57 indicating either the positive electrode external terminal 8A or the negative electrode external terminal 8B is provided outside the can bottom 22 of the battery can 1. The stamp 57 has an asymmetric shape with respect to the first center line LC1, and has a symmetrical shape with respect to the second center line LC2.
The marking 57 is a mark indicating the arrangement of the positive external terminal 8A or the negative external terminal 8B, and is a mark indicating the polarity of the positive external terminal 8A or the negative external terminal 8B. According to the square secondary battery C1 according to the present embodiment, since the number of the markings 57 can be reduced to one as compared with the above-described embodiments, the cost can be reduced by reducing the number of man-hours. .
　本実施の形態では、正極外部端子８Ａ側に円形の刻印５７を設けているが、これに限定されるものではなく、負極外部端子８Ｂ側でも良く、また、刻印に限らず印刷としても良い。また、第１中心線ＬＣ１を基準として非対称の形状を有するものであれば良い。 In the present embodiment, the circular marking 57 is provided on the positive external terminal 8A side, but the present invention is not limited to this, and it may be on the negative external terminal 8B side. Moreover, what is necessary is just to have an asymmetrical shape on the basis of 1st centerline LC1.
＜第５実施の形態＞
　以下に本発明の第５実施の形態について説明する。 <Fifth embodiment>
The fifth embodiment of the present invention will be described below.
　図１２Ａは、第５実施の形態に係わる角形二次電池の一例を示す外観斜視図、図１２Ｂは、図１２Ａの角形二次電池の缶底面を示す正面図である。なお、上述の各実施の形態と同様の構成要素には同一の符号を付することでその詳細な説明を省略する。 FIG. 12A is an external perspective view showing an example of a prismatic secondary battery according to the fifth embodiment, and FIG. 12B is a front view showing a bottom surface of the prismatic secondary battery of FIG. 12A. Note that the same components as those in the above-described embodiments are given the same reference numerals, and detailed description thereof is omitted.
　本実施の形態において特徴的なことは、目印５０を缶底面２２の長辺方向中央位置に設けたことである。 A characteristic point in the present embodiment is that the mark 50 is provided at the center of the bottom surface 22 in the long side direction.
　図１２Ａおよび図１２Ｂに示すように、電池缶１の缶底面２２の外側には正極外部端子８Ａまたは負極外部端子８Ｂのいずれか一方を示す刻印５８からなる目印５０が設けられている。刻印５８は、第１中心線ＬＣ１上に設けられており、第１中心線ＬＣ１を基準とした非対称な形状を有し、缶底面２２の短辺に直交する第２中心線ＬＣ２を基準とした対称な形状を有している。刻印５８は、正極外部端子８Ａまたは負極外部端子８Ｂの配置を示す目印である。 As shown in FIGS. 12A and 12B, a mark 50 made of a mark 58 indicating either the positive electrode external terminal 8A or the negative electrode external terminal 8B is provided on the outer side of the bottom surface 22 of the battery can 1. The engraving 58 is provided on the first center line LC1, has an asymmetric shape with respect to the first center line LC1, and is based on the second center line LC2 orthogonal to the short side of the bottom surface 22 of the can. It has a symmetrical shape. The mark 58 is a mark indicating the arrangement of the positive external terminal 8A or the negative external terminal 8B.
　刻印５８は、矢印の形状を有しており、矢印の先端側が電池の正極側の方向を示している。本実施形態では、正極外部端子８Ａの配置を示す刻印５８を設けているが、これに限定されるものではなく、負極外部端子８Ｂの配置を示す目印でも良く、また、刻印に限らず印刷としても良い。また、缶底面２２の長辺に直交する第１中心線ＬＣ１上にあり、第１中心線ＬＣ１を基準とした非対称の形状を有するものであれば良い。 The stamp 58 has an arrow shape, and the tip side of the arrow indicates the direction of the positive electrode side of the battery. In the present embodiment, the marking 58 indicating the arrangement of the positive electrode external terminal 8A is provided. However, the present invention is not limited thereto, and may be a mark indicating the arrangement of the negative electrode external terminal 8B. Also good. Moreover, what is necessary is just to have on the 1st center line LC1 orthogonal to the long side of the can bottom face 22, and to have an asymmetrical shape on the basis of 1st center line LC1.
＜第６実施の形態＞
　以下に本発明の第６実施の形態について説明する。 <Sixth embodiment>
The sixth embodiment of the present invention will be described below.
　図１３Ａは、第６実施の形態に係わる角形二次電池の一例を示す外観斜視図、図１３Ｂは、図１３Ａの角形二次電池の缶底面を示す正面図である。なお、上述の各実施の形態と同様の構成要素には同一の符号を付することでその詳細な説明を省略する。 FIG. 13A is an external perspective view showing an example of a prismatic secondary battery according to the sixth embodiment, and FIG. 13B is a front view showing a bottom surface of the prismatic secondary battery of FIG. 13A. Note that the same components as those in the above-described embodiments are given the same reference numerals, and detailed description thereof is omitted.
　本実施の形態において特徴的なことは、目印５０として、第１中心線ＬＣ１を基準とした対称な形状を有し、第２中心線ＬＣ２を基準とした非対称な形状を有する刻印５９を設けたことである。 What is characteristic in the present embodiment is that a mark 59 having a symmetrical shape with respect to the first center line LC1 and an asymmetric shape with respect to the second center line LC2 is provided as the mark 50. That is.
　図１３Ａおよび図１３Ｂに示すように、電池缶１の缶底面２２の外側には刻印５９からなる目印５０が設けられている。刻印５９は、第１中心線ＬＣ１上に設けられており、第１中心線ＬＣ１を基準とした対称な形状を有し、第２中心線ＬＣ２を基準とした非対称な形状を有している。 As shown in FIGS. 13A and 13B, a mark 50 made of a stamp 59 is provided on the outside of the bottom surface 22 of the battery can 1. The stamp 59 is provided on the first center line LC1, has a symmetrical shape with respect to the first center line LC1, and has an asymmetric shape with respect to the second center line LC2.
　刻印５９は、正極外部端子８Ａまたは負極外部端子８Ｂの配置を示す目印である。刻印５９は、図１３Ａ及び図１３Ｂに示すように、三角形を有しており、角形二次電池Ｃ１を缶底面２２側から見て図中右側に正極外部端子８Ａが配置され、図中左側に負極外部端子８Ｂが配置された状態で、三角形の頂点が図中上側に配置され、三角形の底辺が図中下側に配置される。これにより、三角形の頂点が図中上側に向いて配置されている場合には、図中右側が正極側であり、図中左側が負極側であることがわかる。 The mark 59 is a mark indicating the arrangement of the positive external terminal 8A or the negative external terminal 8B. 13A and 13B, the engraving 59 has a triangular shape, and the positive electrode external terminal 8A is arranged on the right side in the drawing when the rectangular secondary battery C1 is viewed from the bottom surface 22 side of the can, and on the left side in the drawing. In the state where the negative electrode external terminal 8B is arranged, the apex of the triangle is arranged on the upper side in the figure, and the base of the triangle is arranged on the lower side in the figure. Thereby, when the vertex of a triangle is arrange | positioned toward the upper side in a figure, it turns out that the right side in a figure is a positive electrode side, and the left side in a figure is a negative electrode side.
　本実施形態では、目印５０として三角形の刻印５９を設けているが、形状は三角形に限定されるものではなく、目印５０を見た場合に電池の正極側と負極側の向きがわかる形状であればよく、例えば五角形や矢印など方向を示すことができる形状を用いることができる。また、目印５０は、刻印に限らず印刷としても良い。また、缶底面２２の長辺に直交する第１中心線ＬＣ１上にあり、第１中心線ＬＣ１を基準とした非対称の形状を有するものであれば良い。 In this embodiment, a triangular mark 59 is provided as the mark 50, but the shape is not limited to a triangle, and the shape of the positive electrode side and the negative electrode side of the battery can be understood when the mark 50 is viewed. For example, a shape that can indicate a direction such as a pentagon or an arrow can be used. In addition, the mark 50 is not limited to marking but may be printed. Moreover, what is necessary is just to have on the 1st center line LC1 orthogonal to the long side of the can bottom face 22, and to have an asymmetrical shape on the basis of 1st center line LC1.
　以上、本発明の実施形態について詳述したが、本発明は、前記の実施形態に限定されるものではなく、特許請求の範囲に記載された本発明の精神を逸脱しない範囲で、種々の設計変更を行うことができるものである。例えば、前記した実施の形態は本発明を分かりやすく説明するために詳細に説明したものであり、必ずしも説明した全ての構成を備えるものに限定されるものではない。また、ある実施形態の構成の一部を他の実施形態の構成に置き換えることが可能であり、また、ある実施形態の構成に他の実施形態の構成を加えることも可能である。さらに、各実施形態の構成の一部について、他の構成の追加・削除・置換をすることが可能である。 Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various designs can be made without departing from the spirit of the present invention described in the claims. It can be changed. For example, the above-described embodiment has been described in detail for easy understanding of the present invention, and is not necessarily limited to one having all the configurations described. Further, a part of the configuration of an embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of an embodiment. Furthermore, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.
Ｃ１　　角形二次電池
Ｃ２　　組電池
１　　　電池缶
１００　開口部
２　　　絶縁保護フィルム
３　　　捲回電極体
４Ａ　　正極集電板
４Ｂ　　負極集電板
５　　　ガスケット
６　　　蓋
６Ａ　　正極側貫通孔
６Ｂ　　負極側貫通孔
７　　　絶縁板　　　
８Ａ　　正極外部端子
８Ｂ　　負極外部端子
９　　　注液口
１０　　ガス排出弁
１１　　注液栓
１２Ａ　正極接続部
１２Ｂ　負極接続部
２１　　側壁面
２２　　缶底面
３１　　正極体
３１a 　正極箔
３１b 　正極合剤
３１c 　正極箔露出部
３２　　負極体
３２a 　負極箔
３２b 　負極合剤
３２c 　負極箔露出部
３１d 　正極箔接続部
３２d　 負極箔接続部
３３　　セパレータ
４１Ａ　正極集電板基部
４１Ｂ　負極集電板基部
４２Ａ　正極側接続端部
４２Ｂ　負極側接続端部
４３Ａ　正極側開口穴
４３Ｂ　負極側開口穴
５１～５４、５７～５９　刻印
５５、５６　印刷
７０　スペーサ
７１　基板部
７２　側板部
７３　天板部 C1 prismatic secondary battery C2 assembled battery 1 battery can 100 opening 2 insulating protective film 3 wound electrode body 4A positive electrode current collector plate 4B negative electrode current collector plate 5 gasket 6 lid 6A positive electrode side through hole 6B negative electrode side through hole 7 insulating plate
8A Positive electrode external terminal 8B Negative electrode external terminal 9 Injection port 10 Gas discharge valve 11 Injection plug 12A Positive electrode connection portion 12B Negative electrode connection portion 21 Side wall surface 22 Can bottom surface 31 Positive electrode body 31a Positive electrode foil 31b Positive electrode mixture 31c Positive electrode foil exposed portion 32 Negative electrode body 32a Negative electrode foil 32b Negative electrode mixture 32c Negative electrode foil exposed portion 31d Positive electrode foil connection portion 32d Negative electrode foil connection portion 33 Separator 41A Positive electrode current collector plate base portion 41B Negative electrode current collector plate base portion 42A Positive electrode side connection end portion 42B Negative electrode side connection end portion 43A Positive side opening hole 43B Negative side opening hole 51 to 54, 57 to 59 Mark 55, 56 Printing 70 Spacer 71 Substrate part 72 Side plate part 73 Top plate part

Claims (13)

  1. 　矩形の缶底面を有する電池缶と、該電池缶の缶底面と対向する開口部を封口する電池蓋と、該電池蓋に設けられた正極外部端子および負極外部端子と、前記電池蓋に設けられたガス放出弁と、を有する角形二次電池において、
    　前記電池缶の缶底面の外側には、該缶底面の長辺に直交する第１中心線と、前記缶底面の短辺に直交する第２中心線の少なくとも一方を基準とした非対称な形状を有する目印が設けられていることを特徴とする角形二次電池。     A battery can having a rectangular bottom surface, a battery lid that seals an opening facing the bottom surface of the battery can, a positive electrode external terminal and a negative electrode external terminal provided on the battery lid, and provided on the battery lid A rectangular secondary battery having a gas release valve,
    An outer shape of the bottom surface of the battery can has an asymmetric shape based on at least one of a first center line orthogonal to the long side of the can bottom surface and a second center line orthogonal to the short side of the can bottom surface. A prismatic secondary battery comprising a mark having the mark.
  2. 　前記缶底面の前記目印が設けられている部分の肉厚が、前記電池蓋の前記ガス排出弁が設けられている部分の肉厚よりも厚いことを特徴とする請求項１に記載の角形二次電池。 2. The square two-dimensional structure according to claim 1, wherein a thickness of a portion of the bottom surface of the can where the mark is provided is thicker than a thickness of a portion of the battery lid where the gas discharge valve is provided. Next battery.
  3. 　前記目印は、前記第１中心線を基準とした非対称な形状でかつ前記第２中心線を基準とした対称な形状を有することを特徴とする請求項２に記載の角形二次電池。 3. The prismatic secondary battery according to claim 2, wherein the mark has an asymmetric shape with respect to the first center line and a symmetrical shape with respect to the second center line.
  4. 　前記目印は、前記第１中心線を基準とした対称な形状でかつ前記第２中心線を基準とした非対称な形状を有することを特徴とする請求項２に記載の角形二次電池。 3. The prismatic secondary battery according to claim 2, wherein the mark has a symmetric shape with respect to the first center line and an asymmetric shape with respect to the second center line.
  5. 　前記目印は、前記正極外部端子または前記負極外部端子の配置を示す目印であることを特徴とする請求項２に記載の角形二次電池。 3. The prismatic secondary battery according to claim 2, wherein the mark is a mark indicating an arrangement of the positive external terminal or the negative external terminal.
  6. 　前記目印は前記正極外部端子または前記負極外部端子の極性を示す目印であることを特徴とする請求項２に記載の角形二次電池。 3. The prismatic secondary battery according to claim 2, wherein the mark is a mark indicating a polarity of the positive external terminal or the negative external terminal.
  7. 　前記目印は、刻印によって構成されていることを特徴とする請求項２に記載の角形二次電池。 3. The prismatic secondary battery according to claim 2, wherein the mark is formed by an inscription.
  8. 　前記目印は、印刷によって設けられていることを特徴とする請求項２に記載の角形二次電池。 The prismatic secondary battery according to claim 2, wherein the mark is provided by printing.
  9. 　前記刻印は、プレス加工により設けられていることを特徴とする請求項７に記載の角形二次電池。 The prismatic secondary battery according to claim 7, wherein the stamp is provided by press working.
  10. 　前記刻印は、前記缶底面の外側に凹みを形成し、かつ前記電池缶の内側に前記凹みに応じた形状を有する凸部を形成することによって設けられていることを特徴とする請求項９に記載の角形二次電池。 The said inscription is provided by forming a dent on the outer side of the bottom surface of the can and forming a convex part having a shape corresponding to the dent on the inner side of the battery can. The described prismatic secondary battery.
  11. 　前記目印は、前記正極外部端子および前記負極外部端子のいずれか一方のみを示すことを特徴とする請求項２に記載の角形二次電池。 3. The prismatic secondary battery according to claim 2, wherein the mark indicates only one of the positive external terminal and the negative external terminal.
  12. 　前記目印は、前記第１中心線上に配置されていることを特徴とする請求項２に記載の角形二次電池。 The prismatic secondary battery according to claim 2, wherein the mark is disposed on the first center line.
  13. 　複数の角形二次電池が配列された組電池であって、
    　前記複数の角形二次電池は、
    　矩形の缶底面を有する電池缶と、該電池缶の缶底面と対向する開口部を封口する電池蓋と、該電池蓋に設けられた正極外部端子および負極外部端子と、前記電池蓋に設けられたガス排出弁とをそれぞれ有し、配列方向に直交する方向に前記缶底面を露出させた状態で配列され、前記電池缶の缶底面の外側には、該缶底面の長辺に直交する第１中心線と、前記缶底面の短辺に直交する第２中心線の少なくとも一方を基準とした非対称な形状を有する目印が設けられていることを特徴とする組電池。     An assembled battery in which a plurality of prismatic secondary batteries are arranged,
    The plurality of prismatic secondary batteries are:
    A battery can having a rectangular bottom surface, a battery lid that seals an opening facing the bottom surface of the battery can, a positive electrode external terminal and a negative electrode external terminal provided on the battery lid, and provided on the battery lid Each of the gas canisters is arranged in a state where the bottom surface of the can is exposed in a direction orthogonal to the arrangement direction, and the outside of the bottom surface of the can of the battery can is orthogonal to the long side of the bottom surface of the can. A battery pack comprising a mark having an asymmetric shape with respect to at least one of one center line and a second center line orthogonal to the short side of the bottom surface of the can.
PCT/JP2013/066816 2013-06-19 2013-06-19 Rectangular-prism-shaped secondary battery WO2014203344A1 (en)

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