WO2019049377A1 - Batterie et bloc-batterie - Google Patents

Batterie et bloc-batterie Download PDF

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Publication number
WO2019049377A1
WO2019049377A1 PCT/JP2017/032708 JP2017032708W WO2019049377A1 WO 2019049377 A1 WO2019049377 A1 WO 2019049377A1 JP 2017032708 W JP2017032708 W JP 2017032708W WO 2019049377 A1 WO2019049377 A1 WO 2019049377A1
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WO
WIPO (PCT)
Prior art keywords
positive electrode
battery
exterior
external terminal
negative electrode
Prior art date
Application number
PCT/JP2017/032708
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English (en)
Japanese (ja)
Inventor
直樹 岩村
橋本　達也
Original Assignee
株式会社 東芝
東芝インフラ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.)
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Application filed by 株式会社 東芝, 東芝インフラシステムズ株式会社 filed Critical 株式会社 東芝
Priority to PCT/JP2017/032708 priority Critical patent/WO2019049377A1/fr
Publication of WO2019049377A1 publication Critical patent/WO2019049377A1/fr

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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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/548—Terminals characterised by the disposition of the terminals on the cells on opposite sides of the cell
    • 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
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/176—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells 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
    • 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
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
    • 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

  • Embodiments of the present invention relate to a battery and a battery pack.
  • a battery such as a primary battery and a secondary battery generally comprises an electrode group provided with a positive electrode and a negative electrode, an exterior member for housing the electrode group, and a positive electrode terminal and a negative electrode terminal provided on the exterior member.
  • metal cans and laminated film containers are put to practical use as exterior members.
  • the metal can is obtained by deep drawing from a metal plate such as aluminum.
  • the metal plate needs to have a certain thickness, which hinders the thinning of the exterior member, leading to a loss of volumetric capacity.
  • the ratio of the total thickness of the outer can to the battery thickness is about 7.7%.
  • the outer can is high in rigidity and poor in flexibility, a gap is likely to be generated between the inner wall of the outer can and the electrode group.
  • a gap may be generated between the positive electrode and the negative electrode of the electrode group, and the charge / discharge cycle performance may be degraded.
  • the rigid outer can is likely to cause a defect such as a crack when an excessive force is applied in the vicinity of the weld.
  • the thickness of the metal can is reduced, when welding components such as a bus bar to the positive electrode terminal or the negative electrode terminal, the metal can is easily deformed by the force applied to the metal can at the time of welding. As a result, the position of the component with respect to the positive electrode terminal or the negative electrode terminal is shifted, and it becomes difficult to weld the component to a predetermined position of the positive electrode terminal and the negative electrode terminal.
  • the problem to be solved by the present invention is to provide a battery and battery pack which can be thinned and which is excellent in reliability.
  • a battery that includes a flat electrode group, an exterior member, a terminal portion, and a first insulating member.
  • the electrode group includes a positive electrode, a positive current collecting tab electrically connected to the positive electrode, a negative electrode, and a negative current collecting tab electrically connected to the negative electrode.
  • the positive electrode current collection tab wound in a flat shape is located at the first end face of the electrode assembly.
  • a flat negative current collector tab is located at the second end face of the electrode assembly.
  • the exterior member includes a first exterior portion made of stainless steel which has a bottomed rectangular cylindrical shape and has a flange portion at an opening, and a second exterior portion made of stainless steel.
  • the electrode group is accommodated in the space formed by welding the flange portion of the first exterior portion and the second exterior portion.
  • the first end face and the second end face of the electrode assembly face the inner surface of the side wall of the first exterior part.
  • the terminal portion includes a through hole opened in the side wall of the first exterior portion.
  • the terminal portion also includes an external terminal including a head portion and a stem portion extending from the head portion.
  • the external terminal is electrically connected to the positive electrode or the negative electrode, and the head portion protrudes outside the first exterior portion, and the shaft portion is crimped and fixed to the through hole of the first exterior portion.
  • the first insulating member is disposed between the head of the external terminal and the first exterior portion of the exterior member.
  • the head of the external terminal or the first insulating member is provided with a pair of tapered portions.
  • a battery pack including at least one battery of the embodiment is provided.
  • FIG. 3 is a cross-sectional view of the battery shown in FIG. 2 taken along line VIII.
  • the schematic sectional drawing which shows the process of welding a jig
  • the perspective view which shows the method of attaching a 2nd insulation member to the positive electrode external terminal of the battery shown in FIG. The perspective view which shows positive electrode terminal part vicinity of the battery of 2nd Embodiment. Sectional drawing which cut
  • FIG. 17 is a perspective view showing a method of attaching a second insulating member to the positive electrode external terminal of the battery shown in FIG. 16; Sectional drawing which cut
  • FIG. 22 is an enlarged perspective view showing the vicinity of a terminal portion of the battery pack of FIG. 21.
  • FIG. 25 is an enlarged perspective view showing the vicinity of a terminal portion of the battery pack of FIG. 24;
  • a battery including a flat electrode group, an exterior member, a terminal portion, and a first insulating member.
  • the flat-shaped electrode group includes a positive electrode, a positive electrode current collecting tab electrically connected to the positive electrode, a negative electrode, and a negative electrode current collecting tab electrically connected to the negative electrode.
  • the positive electrode current collection tab wound to flat shape is located in a 1st end surface
  • the negative electrode current collection tab wound to flat shape is located in a 2nd end surface.
  • the exterior member includes a first exterior portion made of stainless steel which has a bottomed rectangular cylindrical shape and has a flange portion at an opening, and a second exterior portion made of stainless steel.
  • the electrode group is accommodated in a space formed by welding the flange portion of the first exterior portion and the second exterior portion.
  • the first end face and the second end face of the electrode assembly face the inner surface of the side wall of the first exterior part.
  • the terminal portion includes a through hole opened in a side wall of the first exterior portion, and an external terminal electrically connected to the positive electrode or the negative electrode.
  • the external terminal includes a head and a stem extending out of the head. The head projects outside the first exterior part.
  • the shaft portion is crimped and fixed to the through hole of the first exterior portion.
  • the first insulating member is disposed between the first exterior portion of the exterior member and the head of the external terminal. A pair of tapered portions is provided at the head of the external terminal.
  • the battery of the first embodiment will be described with reference to FIGS. 1 to 12.
  • the battery 100 shown in FIG. 1 is a non-aqueous electrolyte battery.
  • Battery 100 includes exterior member 1, electrode group 2, positive electrode terminal portion 3, negative electrode terminal portion 4, and a non-aqueous electrolyte (not shown).
  • the exterior member 1 includes a first exterior portion 5 and a second exterior portion 6.
  • the first exterior portion 5 is a bottomed rectangular tube container made of stainless steel, and has a flange portion 5b at the opening 5a.
  • a concave portion protruding inward of the container is provided near the center of the corner connecting the short side wall and the bottom of the first exterior portion 5, and the bottom of the concave portion is inclined. It is a face 5c.
  • the first exterior portion 5 has a depth equal to or less than the size of the opening 5 a (the maximum length of the portion to be the opening area).
  • a more preferable first exterior part 5 has a depth equal to or less than the short side of the portion to be the opening area (for example, as shown in FIG. 1).
  • the first exterior part 5 is manufactured, for example, by shallow drawing from a stainless steel plate.
  • the second exterior part 6 is a rectangular plate made of stainless steel.
  • the electrode group 2 is accommodated in a space formed by welding the flange portions 5 b of the first exterior portion 5 to the four sides of the second exterior portion 6.
  • resistance seam welding is used, for example. Resistance seam welding can achieve high airtightness and heat resistance at low cost compared to laser welding.
  • the electrode group 2 has a flat shape as shown in FIG. Further, as shown in FIG. 6, the electrode group 2 includes the positive electrode 7, the negative electrode 8, and the separator 9 disposed between the positive electrode 7 and the negative electrode 8.
  • the positive electrode 7 is, for example, a strip-like positive electrode current collector made of foil, a positive electrode current collecting tab 7a having one end parallel to the long side of the positive electrode current collector, and a positive electrode current collector except for at least a portion of the positive electrode current collecting tab 7a. And a positive electrode material layer (positive electrode active material-containing layer) 7b formed on the current collector.
  • the negative electrode 8 is, for example, a strip-like negative electrode current collector made of foil, a negative electrode current collector tab 8a having one end parallel to the long side of the negative electrode current collector, and at least a portion of the negative electrode current collector tab 8a. And a negative electrode material layer (negative electrode active material containing layer) 8b formed on the negative electrode current collector.
  • the positive electrode material layer 7 b of the positive electrode 7 and the negative electrode material layer 8 b of the negative electrode 8 face each other through the separator 9, and the positive electrode current collection tab 7 a is closer to the one side of the winding axis than the negative electrode 8 and the separator 9.
  • the positive electrode 7, the separator 9 and the negative electrode 8 are wound in a flat shape so that the negative electrode current collection tab 8a protrudes from the positive electrode 7 and the separator 9 on the other side. Therefore, in the electrode group 2, the flat spirally wound positive electrode current collection tab 7 a is positioned on the first end face perpendicular to the winding axis. In addition, a flat spirally wound negative electrode current collection tab 8a is positioned at a second end face perpendicular to the winding axis.
  • the insulating sheet (not shown) covers a portion of the outermost periphery of the electrode group 2 excluding the positive electrode current collection tab 7 a and the negative electrode current collection tab 8 a.
  • the electrode group 2 holds a non-aqueous electrolyte (not shown).
  • the backup positive electrode lead 11 (first positive electrode lead) is obtained by bending a conductive plate in a U-shape, and the positive electrode current collector tab 7a has a positive electrode collector 11 sandwiching a portion (near the center) excluding curved portions at both ends. The layers of the electric tab 7a are in close contact with each other.
  • the positive electrode current collecting tab 7a and the backup positive electrode lead 11 are integrated by welding, whereby the positive electrode 7 is electrically connected to the backup positive electrode lead 11 via the positive electrode current collecting tab 7a. Welding is performed by ultrasonic welding, for example.
  • the backup negative electrode lead 12 (first negative electrode lead) is formed by bending a conductive plate in a U-shape, and the negative electrode current collector tab 8a has a negative electrode collector sandwiching a portion (near the center) excluding curved portions at both ends The layers of the electric tab 8a are in close contact with each other.
  • the negative electrode current collection tab 8a and the backup negative electrode lead 12 are integrated by welding, whereby the negative electrode 8 is electrically connected to the backup negative electrode lead 12 via the negative electrode current collection tab 8a. Welding is performed by ultrasonic welding, for example.
  • FIG. 7 shows the vicinity of the positive electrode terminal portion 3 in a longitudinal sectional view (indicated by VII in FIG. 1) of the battery shown in FIG. 1 cut along the long side intersecting the positive electrode terminal portion 3 and the negative electrode terminal portion 4 .
  • 8 shows a cross-sectional view (indicated by VIII in FIG. 2) obtained by cutting the battery shown in FIG. 2 along the axial direction of the positive electrode external terminal 14. As shown in FIG.
  • the positive electrode terminal portion 3 has a through hole 13 opened in the inclined surface 5c of the first exterior portion 5, a positive electrode external terminal 14, a positive electrode insulating gasket 15, a positive electrode insulating plate (First positive electrode insulating member) 16.
  • the first through hole 13 is provided on the inclined surface 5 c of the first exterior portion 5 by burring, and a rising portion serving as a side wall protrudes inward of the first exterior portion 5.
  • the positive electrode external terminal 14 has a substantially truncated pyramidal shape, and includes a head portion 17 having a long side in the short side direction of the first exterior portion 5 and a cylindrical shaft portion 18.
  • the head 17 has a rectangular top surface 17a, first and second inclined surfaces 17b and 17c connected to opposite long sides of the top surface 17a, and tapered portions 17d provided on four sides of the bottom surface with respect to the top surface 17a.
  • a cylindrical shaft 18 extends from the lower surface of the head 17.
  • the positive electrode external terminal 14 is formed of, for example, a conductive material such as aluminum or an aluminum alloy.
  • tapered portions 17 d are provided on each side of the lower surface of the head portion 17, the tapered portions provided on the opposite short sides and the tapered portions provided on the opposite long sides form a pair.
  • the two pairs of tapered portions 17 d are respectively inclined such that the area of the cross section of the head portion 17 becomes smaller toward the lower side.
  • inclined surfaces which are two pairs of tapered portions 17 d respectively face the positive electrode insulating plate 16.
  • the positive electrode external terminal 14 has any of three surfaces by having a quadrilateral top surface 17a and first and second inclined surfaces 17b and 17c connected to two opposing sides of the top surface.
  • the welding direction can be changed by selecting the welding surface.
  • the positive electrode insulating gasket 15, as shown in FIGS. 7 and 8, is a cylindrical body (cylindrical portion) having a flange portion 15a at one opening end. As shown in FIGS. 7 and 8, in the positive electrode insulating gasket 15, the portion of the cylindrical body is inserted into the through hole 13, and the flange portion 15a is disposed on the outer periphery of the through hole 13 on the outer surface of the first exterior portion 5. It is done.
  • the positive electrode insulating gasket 15 is made of, for example, fluorine resin, fluorine rubber, polyphenylene sulfide resin (PPS resin), polyetheretherketone resin (PEEK resin), polypropylene resin (PP resin), and polybutylene terephthalate resin (PBT resin). It is formed of resin.
  • the positive electrode insulating plate (first positive electrode insulating member) 16 is a rectangular insulating plate having a through hole as shown in FIGS. 7 and 8.
  • the positive electrode insulating plate 16 is disposed on the outer surface of the first exterior part 5. As shown in FIGS. 7 and 8, the flange portion 15 a of the positive electrode insulating gasket 15 is inserted into the through hole of the positive electrode insulating plate 16.
  • the positive electrode terminal portion 3 can further include a positive electrode terminal lead 19.
  • the positive electrode terminal lead 19 is a conductive plate having a through hole 19a.
  • the positive electrode terminal portion 3 can further include the positive electrode insulation reinforcing member 20.
  • the positive electrode insulating reinforcing member 20 reinforces the short side wall including the inclined surface 5 c of the first exterior portion 5 and has a substantially U-shaped cross section. That is, the positive electrode insulating reinforcing member 20 includes a rectangular bottom plate 20a, a side plate 20b vertically rising from the long side of the bottom plate 20a, an inclined plate 20c connected to the long side of the side plate 20b, and a long side of the inclined plate 20c.
  • the horizontally extending upper plate 20d is integrated with the upper plate 20d.
  • the inclined plate 20c has a recess 20e.
  • a through hole 20f is provided in the recess 20e.
  • the positive electrode insulating reinforcing member 20 covers a corner portion in which the bottom plate 20 a and the side plate 20 b are connected from the short side wall of the first exterior portion 5 to the second exterior portion 6.
  • the shaft portion 18 of the positive electrode external terminal 14 is inserted into the through hole 20 f of the inclined plate 20 c.
  • the lower end surface of the positive electrode insulating gasket 15 and the end surface of the side wall of the through hole 13 of the first exterior portion 5 are in contact with the surface of the recess 20 e of the inclined plate 20 c.
  • the back surface of the recess 20 e of the inclined plate 20 c is in contact with the positive electrode terminal lead 19.
  • the upper plate 20 d is in contact with the bottom surface of the first exterior portion 5.
  • the positive electrode insulating reinforcing member 20 insulates the first exterior portion 5 from the positive electrode terminal lead 19 and shorts including the short side of the exterior member, particularly the inclined surface 5 c of the first exterior portion 5.
  • the side wall can be reinforced.
  • the shaft portion 18 of the positive electrode external terminal 14 is plastically deformed by caulking after being inserted into the positive electrode insulating gasket 15, the through hole 20 f of the positive electrode insulating reinforcing member 20, and the through hole 19 a of the positive electrode terminal lead 19. As a result, these members are integrated, and the positive electrode external terminal 14 is electrically connected to the positive electrode terminal lead 19. Thus, the positive electrode external terminal 14 also plays the role of a rivet.
  • the boundary between the end face of the shaft portion 18 of the positive electrode external terminal 14 and the through hole 19a of the positive electrode terminal lead 19 may be welded by a laser or the like to achieve stronger connection and improvement in electrical conductivity.
  • the positive electrode intermediate lead 21 (third positive electrode lead) is obtained by bending a rectangular or strip conductive plate into a substantially U shape.
  • the positive electrode intermediate lead 21 is disposed between the backup positive electrode lead 11 and the positive electrode terminal lead 19.
  • One outer surface of positive electrode intermediate lead 21 is fixed to backup positive electrode lead 11 by, for example, welding, and the other outer surface is fixed to positive electrode terminal lead 19 by, for example, welding.
  • the backup positive electrode lead 11, the positive electrode intermediate lead 21, and the positive electrode terminal lead 19 are electrically connected. Laser welding, resistance welding, ultrasonic welding, etc. may be mentioned as the welding method.
  • the negative electrode terminal portion 4 has the same structure as the positive electrode terminal portion 3. That is, negative electrode terminal portion 4 includes a through hole opened in inclined surface 5 c of first exterior portion 5, a negative electrode external terminal, a negative electrode insulating gasket, and a negative electrode insulating plate (first negative electrode insulating member). . In addition, the negative electrode terminal portion 4 can further include a negative electrode terminal lead (second negative electrode lead). The negative electrode terminal lead is a conductive plate having a through hole. When the negative electrode terminal portion 4 includes a negative electrode terminal lead, the negative electrode terminal portion 4 can further include a negative electrode insulation reinforcing member. In addition, a negative electrode intermediate lead (third negative electrode lead) is disposed between the backup negative electrode lead 12 and the negative electrode terminal lead. These members have the same structure as that described for the positive electrode terminal portion 3.
  • the electrode group 2 is housed in the first exterior part 5 so that the first end face 7 a faces the positive electrode terminal part 3 and the second end face 8 a faces the negative electrode terminal part 4. Therefore, a plane intersecting the first end face 7a and the second end face 8a of the electrode group 2 faces the bottom surface in the first exterior part 5, and a curved surface intersecting the first end face 7a and the second end face 8a is the first exterior It faces the long side surface in the part 5.
  • a gap exists between the first end surface 7 a of the electrode group 2 and the second end surface 8 a.
  • a recessed portion extending inward is provided at a corner portion connecting the short side wall of the first exterior portion 5 and the bottom portion, and the bottom portion of the recess is formed as the inclined surface 5c, thereby reducing the dead space in the first exterior portion 5. Therefore, the volumetric energy density of the battery can be increased.
  • installation of the terminal portion is more than in the case where the positive electrode terminal portion 3 and the negative electrode terminal portion 4 are provided on the short side surface having no inclined surface. The area can be increased. Therefore, the diameter of the shaft portion 18 of the positive electrode external terminal 14 and the shaft portion of the negative electrode external terminal can be increased, so that a large current (high rate current) can be flowed with low resistance.
  • the second exterior portion 6 functions as a lid of the first exterior portion 5.
  • the electrode group 2 is sealed in the exterior member 1 by welding the flange portion 5 b of the first exterior portion 5 and the four sides of the second exterior portion 6.
  • the non-aqueous electrolyte battery shown in FIGS. 1 to 8 described above is a space formed by welding a stainless steel first exterior portion having a flange portion at an opening portion and a second exterior portion made of stainless steel.
  • the exterior member in which an electrode group is accommodated is included. Since the first and second exterior parts are made of stainless steel, high strength can be maintained even when the thickness of the first and second exterior parts is reduced. As a result, since the flexibility of the exterior member can be enhanced, it becomes easy to restrain the electrode group by applying a load from the outside of the reduced pressure sealing or the exterior member. Thereby, the distance between the electrodes of the electrode group can be stabilized and the resistance can be lowered, and the battery pack having vibration resistance and impact resistance can be easily realized. Furthermore, if the flexibility of the first and second exterior parts is high, it is easy to reduce the distance from the inner surface of the first and second exterior parts to the electrode group, so the heat dissipation of the battery can be improved. .
  • the first and second sheaths made of stainless steel are easy to weld and can be sealed by inexpensive resistance seam welding. Therefore, it is possible to realize an exterior member having a gas sealability higher than that of the laminate film container at low cost. Moreover, the heat resistance of the exterior member can be improved. For example, while the melting point of SUS304 is 1400 ° C., the melting point of Al is 650 ° C.
  • the bus bar 23 made of a conductive plate is welded to the top surface 17 a of the head 17, the space between the pair of tapered portions 17 d of the head 17 and the positive electrode insulating member 16 is welded. Since the head portion 17 is reinforced by the jig 22 by arranging the hook-shaped jig 22, deformation of the head portion 17 and the exterior member due to the force applied at the time of welding is prevented, and positioning of the bus bar 23 is easy Thus, the bus bar 23 is welded to a predetermined position on the top surface 17 a of the head portion 17 with high strength. As a result, the reliability of the battery can be improved.
  • bus-bar material which comprises a bus-bar is not specifically limited, For example, aluminum etc. are contained.
  • the pair of tapered portions may be provided on only one of the positive electrode external terminal and the negative electrode external terminal, or may be provided on both the positive electrode external terminal and the negative electrode external terminal.
  • the reliability of the battery can be further improved by providing a pair of tapered portions on both the positive electrode external terminal and the negative electrode external terminal.
  • the tapered portions of the pair do not have to be provided along the entire side, and may be in point symmetry with each other.
  • the pair of tapered portions is not limited to one, and may be plural.
  • the plate thickness of the first exterior part and the second exterior part is desirably in the range of 0.02 mm or more and 0.3 mm or less. By setting this range, the contradictory properties of mechanical strength and flexibility can be compatible. A more preferable range of the plate thickness is 0.05 mm or more and 0.15 mm or less.
  • the inclined portion is not limited to the one provided near the center of the short side of the exterior member, and may extend over the entire short side of the exterior member.
  • a flat plate as illustrated in FIG. 3 can be used for the second exterior portion, one having a flange portion at the opening may be used instead of the flat plate.
  • a flat plate as illustrated in FIG. 3 can be used for the second exterior portion, one having a flange portion at the opening may be used instead of the flat plate.
  • the same thing as a 1st exterior part can be mentioned.
  • the exterior member may further include a safety valve or the like that can release the pressure inside the battery when the battery internal pressure rises above a specified value.
  • the backup positive electrode lead and the backup negative electrode lead are not limited to the U-shaped conductive plate, and a conductive flat plate may be used. In addition, it is also possible to adopt a configuration without using the backup positive electrode lead and / or the backup negative electrode lead.
  • a battery including a flat-shaped electrode group, an exterior member, a terminal portion, and a first insulating member, and a pair of tapered portions provided on the head of the external terminal. Is provided.
  • the battery of the second embodiment further includes a second insulating member having a wedge-shaped edge. With the edge portion of the second insulating member inserted in the pair of tapered portions, the second insulating member is between the head of the external terminal and the first exterior portion or the first insulating member. It is arranged.
  • FIG. 10 is a perspective view showing the vicinity of the positive electrode terminal portion of the battery of the second embodiment.
  • FIG. 11 shows the vicinity of the positive electrode terminal portion 3 in the longitudinal sectional view of the battery shown in FIG. 10 cut along the long side intersecting the positive electrode terminal portion 3 and the negative electrode terminal portion 4.
  • FIG. 12 is a perspective view showing a method of attaching the second insulating member to the positive electrode external terminal of the battery shown in FIG.
  • the battery of the second embodiment has the same structure as the battery of the first embodiment except that the second insulating member and the bus bar are provided. Further, since the positive electrode terminal portion 3 and the negative electrode terminal portion 4 have the same structure, the positive electrode terminal portion 3 will be described as an example.
  • the second insulating member 30 includes a left insulator 31 and a right insulator 32.
  • the left insulator 31 covers the bus bar insulating portion 31a covering the short side surface including the inclined portion 5c of the first exterior portion 5, and extends from one side of the bus bar insulating portion 31a to the first inclined surface 17b of the head 17. It includes a terminal insulating portion 31b covering one side and a rectangular notch 31c provided in the bus bar insulating portion 31a.
  • the edge of the notch 31c has a wedge shape in which the cross-sectional area (crossing area) decreases toward the tip.
  • the right side insulator 32 extends from one side of the bus bar insulating portion 32a covering the short side surface including the inclined portion 5c of the first exterior portion 5 and one side of the bus bar insulating portion 32a.
  • a terminal insulating portion 32b covering the rest of 17b and a rectangular notch 32c provided in the bus bar insulating portion 32a are included.
  • the edge of the notch 32c has a wedge shape in which the cross-sectional area (the cross-sectional area) decreases toward the tip.
  • the tapered portion 17 d of the head portion 17 of the positive electrode external terminal 14 is disposed in a space formed by combining the notch portion 31 c and the notch portion 32 c.
  • the left insulator 31 is inserted from the left side of FIG. 12, and the edge of the notch 31 c is inserted into and fitted to the left half of the tapered portion 17 d of the head portion 17.
  • the right side insulator 32 is inserted from the right side of FIG. 12, and the edge of the notch 32c is inserted into the right half of the tapered portion 17d of the head 17 and fitted.
  • the left insulator 31 and the right insulator 32 are fixed to the tapered portion 17d of the head 17 in a state where they are in contact with each other.
  • the terminal insulating portion 31 b of the left insulator 31 and the terminal insulating portion 32 b of the right insulator 32 cover the first inclined surface 17 b of the head portion 17.
  • bus bar insulating portion 31 a of the left insulator 31 and the bus bar insulating portion 32 a of the right insulator 32 cover the short side surface including the inclined portion 5 c of the first exterior portion 5.
  • the bus bar 33 rises substantially perpendicularly from a flat first connection portion 34 having a through hole 34 a and one side of the first connection portion 34, and the first exterior portion 5 And a second connection portion 35 bent along the side surface of the short side.
  • the second connection portion 35 is fixed to the second inclined surface 17 c of the head portion 17 by welding, for example, whereby the positive electrode external terminal 14 and the bus bar 33 are electrically connected.
  • the first connection portion 34 can be used to electrically connect to another battery or the like. Laser welding, resistance welding, ultrasonic welding, etc. may be mentioned as the welding method.
  • bus bar insulating portions 31a and 32a are located between the bus bar 33 and the first exterior portion 5, it is possible to prevent the bus bar 33 from contacting the first exterior portion 5 and causing a short circuit.
  • both of the positive electrode terminal portion 3 and the negative electrode terminal portion 4 may be provided with the second insulating member 30, but one of the positive electrode terminal portion 3 or the negative electrode terminal portion 4 is provided with the second insulating member 30. May be Also in this case, a battery with excellent reliability can be obtained.
  • FIG. 13 is a perspective view showing the vicinity of the positive electrode terminal portion of another example of the battery of the second embodiment.
  • FIG. 14 is a cross-sectional view of the positive electrode terminal portion 3 of the battery shown in FIG. 13 cut along the axial direction of the positive electrode exterior terminal 14.
  • FIG. 15 is a perspective view showing a method of attaching the second insulating member to the positive electrode external terminal of the battery shown in FIG.
  • Another example of the battery of the second embodiment has the same structure as that of the battery of the first embodiment except that the second insulating member and the bus bar are provided. Further, since the positive electrode terminal portion 3 and the negative electrode terminal portion 4 have the same structure, the positive electrode terminal portion 3 will be described as an example.
  • the second insulating member 36 extends from the inclined portion 36a inclined along the inclined portion 5c of the first exterior portion 5 and one side of the inclined portion 36a, and the first exterior portion It includes an extending portion 36b bent along the short side wall of 5 and a notch 36c provided at an end of the inclined portion 36a.
  • the edge of the notch 36c has a wedge shape in which the cross-sectional area (crossing area) becomes smaller toward the tip.
  • the tapered portion 17 d of the head portion 17 of the positive electrode external terminal 14 is disposed in the space surrounded by the notch portion 36 c.
  • the second insulating member 36 is inserted from the lower side of FIG. 15, and the edge of the notch 36c is inserted into the tapered portion 17d of the head 17 and fitted. As a result, as shown in FIG. 13, the second insulating member 36 is fixed to the tapered portion 17 d of the head portion 17.
  • the inclined portion 36 a and the extension portion 36 b of the second insulating member 36 cover the short side surface including the inclined portion 5 c of the first exterior portion 5.
  • the bus bar 33 rises substantially vertically from a flat plate-like first connection portion 34 having a through hole 34 a and one side of the first connection portion 34, and the short side of the first exterior portion 5 And a second connection portion 35 bent along the side surface.
  • the second connection portion 35 is fixed to the second inclined surface 17 c of the head portion 17 by welding, for example, whereby the positive electrode external terminal 14 and the bus bar 33 are electrically connected.
  • the first connection portion 34 can be used to electrically connect to another battery or the like. Laser welding, resistance welding, ultrasonic welding, etc. may be mentioned as the welding method.
  • the bus bar 33 can be prevented from coming into contact with the first exterior portion 5 to cause a short circuit.
  • both the positive electrode terminal portion 3 and the negative electrode terminal portion 4 may be provided with the second insulating member 36 as described above, one of the positive electrode terminal portion 3 or the negative electrode terminal portion 4 is provided with the second insulating member 36 May be Also in this case, a battery with excellent reliability can be obtained.
  • FIG. 16 is a perspective view showing the vicinity of the positive electrode terminal portion of the battery of the second embodiment.
  • FIG. 17 is a cross-sectional view of the positive electrode terminal portion 3 of the battery shown in FIG. 16 cut along the axial direction of the positive electrode external terminal 14.
  • FIG. 18 is a perspective view showing a method of attaching the second insulating member to the positive electrode external terminal of the battery shown in FIG.
  • the second connection portion 35 of the bus bar 33 is fixed to the second inclined surface 17 c of the head portion 17 by welding, for example, whereby the positive electrode external terminal 14 and the bus bar 33 are electrically connected. Ru.
  • the first connection portion 34 can be used to electrically connect to another battery or the like. Laser welding, resistance welding, ultrasonic welding, etc. may be mentioned as the welding method.
  • the second insulating member 37 extends from one side of the bus bar insulating portion 37a covering the short side surface including the inclined portion 5c of the first exterior portion 5 and one side of the bus bar insulating portion 37a.
  • a terminal insulating portion 37b covering the first inclined surface 17b of 17 and a rectangular cutout portion 37c provided in the bus bar insulating portion 37a are included.
  • the edge of the notch 37c has a wedge shape in which the cross-sectional area (crossing area) becomes smaller toward the tip.
  • the tapered portion 17 d of the head portion 17 of the positive electrode external terminal 14 is disposed in the space surrounded by the notch portion 37 c.
  • the second insulating member 37 slides on the exterior member from the upper side of FIG. 18 and inserts the edge of the cutout portion 37c into the tapered portion 17d of the head portion 17 so as to be fitted. As a result, as shown in FIGS. 16 and 17, the second insulating member 37 is fixed to the tapered portion 17 d of the head portion 17.
  • the terminal insulating portion 37b of the second insulating member 37 covers the first inclined surface 17b of the head 17, it is possible to prevent the positive electrode external terminal 14 from coming into contact with another battery to cause a short circuit. Further, since the bus bar insulating portion 37a of the second insulating member 37 covers the short side surface including the inclined portion 5c of the first exterior portion 5, preventing the bus bar from contacting the exterior member 1 and causing a short circuit. Can.
  • Both the positive electrode terminal portion 3 and the negative electrode terminal portion 4 may be provided with the second insulating member 37, but it is also possible that the positive electrode terminal portion 3 or the negative electrode terminal portion 4 is provided with the second insulating member 37. Also in this case, a highly reliable battery can be obtained.
  • the inclined surface which each of a terminal insulation part and a bus-bar insulation part coats is not limited to a 1st inclined surface and a 2nd inclined surface.
  • the bus bar insulating portion may cover the first inclined surface, and the terminal insulating portion may cover the second inclined surface.
  • the battery further includes a second insulating member having a wedge-shaped edge. With the edge portion of the second insulating member inserted in the pair of tapered portions, the second insulating member is disposed between the head of the external terminal and the first exterior portion or the first insulating member. It is done. According to the battery of the second embodiment, it is possible to avoid the occurrence of a short circuit when parts for forming the battery pack or external terminals of other batteries come in contact with the exterior member or the external terminals. In addition, since the edge portion of the second insulating member is inserted and fitted into the tapered portion of the head of the external terminal, the second insulating member is detached from the battery even when vibration or impact is applied to the battery. hard.
  • a battery including a flat-shaped electrode group, an exterior member, a terminal portion, and a first insulating member, wherein the first insulating member is provided with a pair of tapered portions.
  • the battery of the third embodiment is the first embodiment except that the tapered portion is not provided on the head of the external terminal of the terminal portion and the pair of tapered portions is provided on the first insulating member. It has the same structure as the form. Further, since the positive electrode terminal portion 3 and the negative electrode terminal portion 4 have the same structure, the positive electrode terminal portion 3 will be described as an example.
  • FIG. 19 is a cross-sectional view of the positive electrode terminal portion 3 of the battery taken along the axial direction of the positive electrode external terminal 14.
  • the same members as those shown in the above-mentioned drawings are denoted by the same reference numerals, and the description thereof will be omitted.
  • the positive electrode external terminal 14 has the same structure as that of the first and second embodiments except that the lower surface of the head portion 17 is not provided with a tapered portion.
  • the first insulating member 38 is a rectangular plate having a through hole 38 a at the center.
  • the through hole 38a has a two-step structure in which the lower diameter is larger than the upper diameter.
  • the first insulating member 38 is provided with tapered portions 38 b on all sides so that the outer dimension becomes smaller toward the lower surface.
  • the tapered portions 38b provided on the opposite short sides are in point-symmetrical relationship and form a pair. Further, the tapered portions 38b provided on the opposite long sides are in point-symmetrical relationship and form a pair.
  • the shaft portion 18 of the positive electrode external terminal 14 partially inserted into the positive electrode insulating gasket 15 is inserted into the through hole 38a of the first insulating member 38, and the positive electrode insulating gasket 15 is formed on the lower inner peripheral surface with a large diameter. I am in touch.
  • the first insulating member 38 is disposed between the lower surface of the head portion 17 of the positive electrode external terminal 14, the surface of the positive electrode insulating gasket 15, and the surface of the first exterior portion 5.
  • the upper surface of the first insulating member 38 is in contact with the lower surface of the head portion 17 of the positive electrode external terminal 14.
  • the lower surface of the first insulating member 38 is in contact with the surface of the positive electrode insulating gasket 15 and the surface of the first exterior portion 5.
  • the two pairs of tapered portions 38 b face the surface (outer surface) of the first exterior portion 5.
  • the shaft 18 of the positive electrode external terminal 14 is inserted into the through hole 38 a of the first insulating member 38, the positive electrode insulating gasket 15, the through hole 20 f of the positive electrode insulating reinforcing member 20, and the through hole 19 a of the positive electrode terminal lead 19. They are fixed by caulking.
  • the first exterior portion 5 By providing a pair of tapered portions on the surface of the first insulating member 38 facing the surface of the first exterior portion 5, another jig is provided between the first insulating member 38 and the first exterior portion 5. Can be easily fixed. Therefore, when welding parts, such as a bus bar, to the head of an external terminal, positioning of an external terminal becomes easy, and it becomes possible to weld with high intensity in a desired position. In addition, since a new insulating member can be fixed between the first insulating member 38 and the first exterior portion 5, the first exterior portion 5 has another conductive part such as a battery or a bus bar. A short circuit due to contact can be avoided. Therefore, the reliability of the battery can be further improved.
  • a bowl-shaped jig and the like can be mentioned.
  • the same members as those described in the first and second embodiments can be mentioned as the bowl-shaped jig.
  • FIG. 20 is a cross-sectional view of the positive electrode terminal portion 3 of the battery taken along the axial direction of the positive electrode external terminal 14.
  • the same members as those shown in the above-mentioned drawings are denoted by the same reference numerals, and the description thereof will be omitted.
  • the positive electrode external terminal 14 has the same structure as that of the first and second embodiments except that the lower surface of the head portion 17 is not provided with a tapered portion.
  • the first insulating member 39 is a rectangular plate having a through hole 39a at the center.
  • the through hole 39a has a two-step structure in which the lower diameter is larger than the upper diameter.
  • the first insulating member 39 is provided with tapered portions (reverse tapered portions) 39b on all sides so that the cross-sectional area gradually decreases and the upper surface becomes the minimum area.
  • the tapered portions 39b provided on the opposite short sides are in point-symmetrical relationship and form a pair. Further, the tapered portions 39b provided on the opposite long sides are in point-symmetrical relationship and form a pair.
  • the shaft portion 18 of the positive electrode external terminal 14 partially inserted into the positive electrode insulating gasket 15 is inserted into the through hole 39 a of the first insulating member 39, and the lower inner peripheral surface of the large diameter diameter of the positive electrode insulating gasket 15 is The flange portion 15a is in contact.
  • the first insulating member 39 is disposed between the lower surface of the head portion 17 of the positive electrode external terminal 14, the surface of the positive electrode insulating gasket 15, and the surface of the first exterior portion 5.
  • the upper surface of the first insulating member 39 is in contact with the lower surface of the head portion 17 of the positive electrode external terminal 14.
  • the lower surface of the first insulating member 39 is in contact with the surface of the positive electrode insulating gasket 15 and the surface of the first exterior portion 5.
  • the two pairs of tapered portions 39 b are opposed to the lower surface of the head portion 17 of the positive electrode external terminal 14.
  • the shaft portion 18 of the positive electrode external terminal 14 is inserted into the through hole 39a of the first insulating member 39, the positive electrode insulating gasket 15, the through hole 20f of the positive electrode insulating reinforcing member 20, and the through hole 19a of the positive electrode terminal lead 19. They are fixed by caulking.
  • a bowl-shaped jig and the like can be mentioned.
  • the same members as those described in the first and second embodiments can be mentioned as the bowl-shaped jig.
  • the battery of the third embodiment may include the second insulating member.
  • the second insulating member is between the first insulating member and the first exterior portion, or the first insulating member and the outside, with the edge portion inserted in the tapered portion of the pair of the first insulating member. It may be disposed between the head of the terminal.
  • the second insulating member include the same members as those described in the first and second embodiments.
  • both the positive electrode terminal portion 3 and the negative electrode terminal portion 4 may be provided with a pair of tapered portions 38b and 39b, it is also possible for the positive electrode terminal portion 3 or the negative electrode terminal portion 4 to be provided with a pair of tapered portions 38b and 39b is there. Also in this case, a highly reliable battery can be obtained.
  • the reliability of the battery can be improved.
  • the batteries according to the first to third embodiments may be primary batteries or secondary batteries.
  • Examples of the battery according to the first to third embodiments include a lithium ion secondary battery.
  • the first to third positive electrode leads and the first to third negative electrode leads can be made of, for example, aluminum, an aluminum alloy material, copper, copper plated with nickel, or the like.
  • the material of the lead is preferably the same as the material of the positive electrode current collector or the negative electrode current collector that can be electrically connected to the lead.
  • the bus bar can be formed of, for example, aluminum, an aluminum alloy material, or the like.
  • the first and second positive electrode insulating members and the first and second negative electrode insulating members, and the insulating and reinforcing members for the positive electrode and the negative electrode are, for example, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA), polypropylene (PP), polyethylene Formed from thermoplastic resins such as (PE), nylon, polybutylene terephthalate (PBT), polyethylene terephthalate (PET), polytetrafluoroethylene (PTFE), polyphenylene sulfide (PPS), and polyetheretherketone (PEEK) Be done.
  • PFA tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer
  • PP polypropylene
  • PE polyethylene
  • PET polyethylene terephthalate
  • PTFE polytetrafluoroethylene
  • PPS polyphenylene sulfide
  • PEEK polyetheretherketone
  • the positive electrode, the negative electrode, the separator, and the non-aqueous electrolyte of the battery of the first to third embodiments will be described below.
  • the positive electrode can include, for example, a positive electrode current collector, a positive electrode material layer held by the positive electrode current collector, and a positive electrode current collection tab.
  • the positive electrode material layer can include, for example, a positive electrode active material, a conductive agent, and a binder.
  • an oxide or a sulfide can be used as the positive electrode active material.
  • oxides and sulfides include lithium occluding manganese dioxide (MnO 2 ), iron oxide, copper oxide, nickel oxide, lithium manganese composite oxide (eg Li x Mn 2 O 4 or Li x MnO 2 ), Lithium nickel complex oxide (eg Li x NiO 2 ), lithium cobalt complex oxide (eg Li x CoO 2 ), lithium nickel cobalt complex oxide (eg LiNi 1-y Co y O 2 ), lithium manganese cobalt complex oxide (For example, Li x Mn y Co 1-y O 2 ), lithium manganese nickel composite oxide having a spinel structure (for example, Li x Mn 2-y Ni y O 4 ), lithium phosphorus oxide having an olivine structure (for example, Li x FePO 4 , Li x Fe 1-y Mn y PO 4 , Li x CoPO 4 ), iron sulfate (MnO
  • the binder is blended to bind the active material and the current collector.
  • the binder include polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVdF), and fluorine-based rubber.
  • the conductive agent is blended as needed to enhance the current collection performance and to reduce the contact resistance between the active material and the current collector.
  • conductive agents include carbonaceous materials such as acetylene black, carbon black and graphite.
  • the positive electrode active material and the binder it is preferable to blend the positive electrode active material and the binder at a ratio of 80% by mass to 98% by mass and 2% by mass to 20% by mass, respectively.
  • the binder By setting the binder to an amount of 2% by mass or more, sufficient electrode strength can be obtained. Moreover, by setting it as 20 mass% or less, the compounding quantity of the insulating material of an electrode can be reduced and internal resistance can be reduced.
  • the positive electrode active material, the binder and the conductive agent are each 77% by mass or more and 95% by mass, 2% by mass or more and 20% by mass or less, and 3% by mass or more and 15% by mass or less It is preferable to blend in proportions.
  • the conductive agent can exhibit the above-mentioned effects by setting it to 3% by mass or more. Further, by setting the content to 15% by mass or less, the decomposition of the non-aqueous electrolyte on the surface of the positive electrode conductive agent under high temperature storage can be reduced.
  • Anode may include, for example, an anode current collector, an anode material layer held by the anode current collector, and an anode current collection tab.
  • the negative electrode material layer can include, for example, a negative electrode active material, a conductive agent, and a binder.
  • the negative electrode active material for example, metal oxides, metal nitrides, alloys, carbon and the like which can occlude and release lithium ions can be used. It is preferable to use a substance capable of absorbing and releasing lithium ions at a potential of 0.4 V or more (vs. Li / Li + ) as a negative electrode active material.
  • the binder is blended to fill the gaps of the dispersed negative electrode active material and to bind the negative electrode active material and the current collector.
  • the binder include polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVdF), fluorine-based rubber, and styrene butadiene rubber.
  • the active material, the conductive agent and the binder in the negative electrode material layer are respectively blended in a proportion of 68% by mass to 96% by mass, 2% by mass to 30% by mass, and 2% by mass to 30% by mass. Is preferred.
  • the current collection performance of the negative electrode layer can be improved by setting the amount of the conductive agent to 2% by mass or more. Further, by setting the amount of the binder to 2% by mass or more, the binding property between the negative electrode material layer and the current collector can be sufficiently expressed, and excellent cycle characteristics can be expected.
  • the conductive agent and the binder are preferably 28% by mass or less, respectively, in order to achieve high capacity.
  • the current collector a material that is electrochemically stable at the storage potential and release potential of lithium of the negative electrode active material is used.
  • the current collector is preferably made of copper, nickel, stainless steel or aluminum, or an aluminum alloy containing at least one element selected from Mg, Ti, Zn, Mn, Fe, Cu and Si.
  • the thickness of the current collector is preferably in the range of 5 to 20 ⁇ m. A current collector having such a thickness can balance the strength and weight reduction of the negative electrode.
  • the negative electrode current collector is preferably integral with the negative electrode current collector tab. Alternatively, the negative electrode current collector may be separate from the negative electrode current collection tab.
  • the negative electrode is prepared, for example, by suspending a negative electrode active material, a binder and a conductive agent in a widely used solvent to prepare a slurry, applying the slurry to a current collector, and drying to form a negative electrode material layer. , Produced by applying a press.
  • the negative electrode may be produced by forming a negative electrode active material, a binder and a conductive agent in the form of pellets to form a negative electrode material layer and disposing it on a current collector.
  • the separator may be formed of, for example, a porous film containing polyethylene, polypropylene, cellulose, or polyvinylidene fluoride (PVdF), or a synthetic resin non-woven fabric.
  • a porous film formed of polyethylene or polypropylene can be melted at a certain temperature to interrupt the current, so that the safety can be improved.
  • the non-aqueous electrolyte may be, for example, a liquid non-aqueous electrolyte prepared by dissolving the electrolyte in an organic solvent, or a gel non-aqueous electrolyte in which a liquid electrolyte and a polymer material are complexed.
  • the liquid non-aqueous electrolyte is preferably one in which the electrolyte is dissolved in an organic solvent at a concentration of 0.5 mol / L to 2.5 mol / L.
  • Examples of the electrolyte to be dissolved in an organic solvent include lithium perchlorate (LiClO 4 ), lithium hexafluorophosphate (LiPF 6 ), lithium tetrafluoroborate (LiBF 4 ), lithium hexafluoride arsenic (LiAsF 6) And lithium salts such as lithium trifluoromethanesulfonate (LiCF 3 SO 3 ), and bistrifluoromethylsulfonylimide lithium [LiN (CF 3 SO 2 ) 2 ], and mixtures thereof. It is preferable that the electrolyte be resistant to oxidation even at high potential, and LiPF 6 is most preferable.
  • non-aqueous electrolyte a lithium ion-containing normal temperature molten salt (ionic melt), a solid polymer electrolyte, an inorganic solid electrolyte, or the like may be used.
  • the normal temperature molten salt refers to a compound which can be present as a liquid at normal temperature (15 to 25 ° C.) among organic salts consisting of a combination of an organic cation and an anion.
  • the normal temperature molten salt includes a normal temperature molten salt which is singly present as a liquid, a normal temperature molten salt which becomes a liquid by mixing with an electrolyte, and a normal temperature molten salt which becomes a liquid by being dissolved in an organic solvent.
  • the melting point of the room temperature molten salt used for the non-aqueous electrolyte battery is 25 ° C. or less.
  • organic cations generally have a quaternary ammonium skeleton.
  • the head of the external terminal or the first insulating member is provided with the pair of tapered portions, a highly reliable battery can be provided. Can.
  • the battery pack of the fourth embodiment includes at least one of the batteries of the first to third embodiments.
  • the battery pack of the fourth embodiment may include an assembled battery in which the batteries of the first to third embodiments are unit cells.
  • FIGS. 21 to 24 Examples of the battery assembly of the battery of the fourth embodiment are shown in FIGS. 21 to 24.
  • the negative electrode external terminal 201 of each unit cell 100 1 to 100 4 has the same structure as the positive electrode external terminal 14, and has a substantially truncated pyramidal head 104 having a long side in the short side direction of the first exterior portion 5. And a cylindrical shaft (not shown).
  • the head portion 104 includes a rectangular top surface 104a, first and second inclined surfaces 104b and 104c connected to the opposite long sides of the top surface 104a, and tapered portions (not shown) provided on four sides of the lower surface. Have.
  • a cylindrical shaft extends from the lower surface of the head 104.
  • the negative electrode insulating plate (first negative electrode insulating member) 105 is a rectangular insulating plate having a structure similar to that of the positive electrode insulating plate and having a through hole.
  • the negative electrode insulating plate 105 is disposed on the outer surface of the first exterior portion 5.
  • bus bar 103 of triangular prism shape is disposed between top surface 104a of negative electrode external terminal 201 and top surface 17a of positive electrode external terminal 14, and these are joined to achieve electrical connection. Because the gap between the unit cells can be reduced, the volumetric energy density of the assembled battery 102 can be increased.
  • the battery pack 106 includes an assembled battery 107 using the battery 200 of the second embodiment shown in FIG. 16 as a unit cell.
  • the plurality of (for example, four) second unit cells 200 1 to 200 4 are stacked in a state in which the main surfaces of the exterior members 1 face each other.
  • a negative electrode external terminal 201 of the unit cell 200 3 adjacent to the positive electrode external terminal 14 and the unit cell 200 and second unit cell 200 2 is electrically connected by a bus bar 33.
  • the 33 first connection portions 34 are overlapped.
  • the bolt 108 is inserted into the through hole 34 a of the first connection portion 34 and the bolt 108 is fixed by the nut 109, whereby the negative electrode external terminal 201 and the positive electrode external terminal 14 are electrically connected by the bus bar 33.
  • an insulating space between adjacent unit cells there be an insulating space between adjacent unit cells, and a gap of 0.03 mm or more be provided, or an insulating member (for example, resin polypropylene, polyphenylene sulfide, epoxy, fine ceramics alumina, zirconia, etc.) Can be inserted in between.
  • an insulating member for example, resin polypropylene, polyphenylene sulfide, epoxy, fine ceramics alumina, zirconia, etc.
  • the bus bar can be formed of, for example, aluminum, an aluminum alloy material, or the like.
  • the battery pack is used, for example, as a power source of an electronic device, a vehicle (a railway vehicle, a car, a motorbike, a light vehicle, a trolley bus, etc.).
  • a vehicle a railway vehicle, a car, a motorbike, a light vehicle, a trolley bus, etc.
  • the battery assembly may include a plurality of batteries electrically connected in series, in parallel, or in combination of series and parallel.
  • the battery pack can also be equipped with a circuit such as a battery control unit, but the circuit (for example, a vehicle) equipped with the battery pack is used as the battery control unit. can do.
  • the battery control unit has a function of monitoring the voltage or current or both of the unit cell and the battery pack to prevent overcharging and overdischarging.
  • the battery according to at least one embodiment described above can provide a highly reliable battery because the head of the external terminal or the first insulating member is provided with the pair of tapered portions.

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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)

Abstract

Un mode de réalisation de la présente invention concerne une batterie qui comprend un groupe d'électrodes ayant une forme aplatie, un élément d'emballage extérieur, une partie borne et un premier élément isolant. L'élément d'emballage extérieur contient le groupe d'électrodes à l'intérieur d'un espace qui est formé par soudage d'une partie bride d'une première partie d'emballage extérieur et d'une seconde partie d'emballage extérieur l'une à l'autre. La partie borne comprend une borne externe qui comporte une partie tête et une partie tige. En ce qui concerne la borne externe, la partie tête fait saillie à l'extérieur de la première partie d'emballage extérieur, tandis que la partie tige est fixée à un trou traversant de la première partie d'emballage extérieur par emboutissage. Le premier élément isolant est agencé entre la partie tête de la borne externe et la première partie d'emballage extérieur de l'élément d'emballage extérieur. La partie tête de la borne externe ou le premier élément isolant est pourvu(e) d'une paire de parties effilées.
PCT/JP2017/032708 2017-09-11 2017-09-11 Batterie et bloc-batterie WO2019049377A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4254610A4 (fr) * 2021-10-22 2024-03-13 Contemporary Amperex Technology Co Ltd Batterie, dispositif électrique, procédé de préparation de cellule de batterie et dispositif

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003142043A (ja) * 2001-07-09 2003-05-16 Hitachi Maxell Ltd 電 池
WO2015115557A1 (fr) * 2014-01-29 2015-08-06 株式会社 東芝 Batterie et unité de corps d'étanchéité
WO2016204147A1 (fr) * 2015-06-15 2016-12-22 株式会社 東芝 Batterie et bloc-batterie

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003142043A (ja) * 2001-07-09 2003-05-16 Hitachi Maxell Ltd 電 池
WO2015115557A1 (fr) * 2014-01-29 2015-08-06 株式会社 東芝 Batterie et unité de corps d'étanchéité
WO2016204147A1 (fr) * 2015-06-15 2016-12-22 株式会社 東芝 Batterie et bloc-batterie

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4254610A4 (fr) * 2021-10-22 2024-03-13 Contemporary Amperex Technology Co Ltd Batterie, dispositif électrique, procédé de préparation de cellule de batterie et dispositif

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