WO2019186868A1 - Batterie et bloc-batterie - Google Patents

Batterie et bloc-batterie Download PDF

Info

Publication number
WO2019186868A1
WO2019186868A1 PCT/JP2018/013148 JP2018013148W WO2019186868A1 WO 2019186868 A1 WO2019186868 A1 WO 2019186868A1 JP 2018013148 W JP2018013148 W JP 2018013148W WO 2019186868 A1 WO2019186868 A1 WO 2019186868A1
Authority
WO
WIPO (PCT)
Prior art keywords
exterior
negative electrode
positive electrode
current collecting
collecting tab
Prior art date
Application number
PCT/JP2018/013148
Other languages
English (en)
Japanese (ja)
Inventor
山本　博史
Original Assignee
株式会社 東芝
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 株式会社 東芝 filed Critical 株式会社 東芝
Priority to PCT/JP2018/013148 priority Critical patent/WO2019186868A1/fr
Publication of WO2019186868A1 publication Critical patent/WO2019186868A1/fr

Links

Images

Classifications

    • 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
    • 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
    • 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.
  • Batteries such as a primary battery and a secondary battery generally include an electrode group including a positive electrode and a negative electrode, and an exterior member that houses the electrode group.
  • an exterior member that can be thinned and improved in flexibility and has excellent reliability has been developed.
  • the problem to be solved by the present invention is to provide a battery and a battery pack that can be thinned and improved in flexibility and that include an exterior member that is excellent in reliability and that can be easily manufactured. .
  • the battery of the present embodiment 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.
  • a first exterior portion including a bottom surface and four side surfaces, and having a rectangular box shape having a flange portion at an opening, and including a concave portion having an inclined surface at least at a corner portion between the bottom surface and one side surface;
  • a terminal part including an external terminal electrical
  • the perspective view of the electrode group which concerns on embodiment. The perspective view which shows the state which expanded the electrode group which concerns on embodiment partially.
  • the perspective view of the positive electrode terminal which concerns on embodiment. The perspective view of the positive electrode terminal which concerns on embodiment.
  • the perspective view of the battery pack which concerns on embodiment. The expanded side view of the battery pack which concerns on embodiment.
  • the perspective view of the battery pack which concerns on embodiment. The expanded side view of the battery pack which concerns on embodiment.
  • the battery 100 includes an exterior member 1, an electrode group (not shown), a positive electrode terminal 3, a negative electrode terminal 4, and a non-aqueous electrolyte (not shown).
  • FIG. 2 is an exploded perspective view of the battery 100.
  • the electrode group 2 is simplified, but a more detailed perspective view of the electrode group 2 is shown in FIG. 3.
  • the exterior member 1 includes a first exterior part 5 and a second exterior part 6.
  • the 1st exterior part 5 is a square tube container with a bottom, and has the flange part 5b in the opening part 5a.
  • the first exterior portion 5 is made of, for example, substantially stainless steel, substantially made of nickel-plated steel, or substantially made of aluminum. When the 1st exterior part 5 is made from stainless steel, the 1st exterior part 5 is produced by shallow drawing, for example from a stainless steel plate. As shown in FIGS.
  • the first exterior part 5 has a surface having the maximum area, a long side wall and a short side wall connected to the surface, and a short side wall of the first exterior part 5.
  • a concave portion projecting inward is provided near the center of the corner connecting the bottom portion, and the bottom of the concave portion is an inclined surface 5d.
  • the first exterior portion 5 has a depth shorter than the long side length when the opening 5a is substantially rectangular.
  • the more preferable first exterior portion 5 has a depth shorter than the short side length when the opening 5a is substantially rectangular.
  • the second exterior portion 6 is a rectangular plate substantially made of stainless steel, substantially nickel-plated steel, or substantially aluminum.
  • the electrode group 2 is housed in a space formed by welding the flange portion 5 b of the first exterior portion 5 to the four sides of the second exterior portion 6.
  • resistance seam welding is used. Resistance seam welding can achieve high hermeticity and heat resistance at a lower cost than laser welding.
  • the electrode group 2 has a flat shape, and includes a positive electrode 7, a negative electrode 8, and a separator 9 disposed between the positive electrode 7 and the negative electrode 8.
  • the positive electrode 7 has a strip-shaped positive electrode current collector made of, for example, a foil, and this positive electrode current collector includes a positive electrode current collecting tab 7a having one end parallel to the long side of the positive electrode current collector, and at least a positive electrode current collector. And a positive electrode material layer (positive electrode active material-containing layer) 7b formed on the positive electrode current collector excluding the portion of the tab 7a.
  • the negative electrode 8 has a strip-shaped negative electrode current collector made of, for example, a foil, and the negative electrode current collector includes a negative electrode current collecting tab 8a having one end parallel to the long side of the negative electrode current collector, and at least the negative electrode A negative electrode material layer (negative electrode active material-containing layer) 8b formed on the negative electrode current collector, excluding the portion of the current collecting tab 8a.
  • 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 are opposed to each other through the separator 9, and the positive electrode current collecting tab 7 a is disposed on one side of the winding shaft more 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 collecting tab 8a protrudes from the positive electrode 7 and the separator 9 on the other side. Therefore, in the electrode group 2, the positive electrode current collecting tab 7a wound in a flat spiral shape is located on the first end surface perpendicular to the winding axis. Moreover, the negative electrode current collection tab 8a wound by the flat spiral shape is located in the 2nd end surface perpendicular
  • the insulating sheet 10 covers a portion of the outermost periphery of the electrode group 2 excluding the positive electrode current collecting tab 7a and the negative electrode current collecting tab 8a.
  • the electrode group 2 holds a nonaqueous electrolyte (not shown).
  • the positive electrode lead 12 is formed by bending a conductive plate into a U shape.
  • the positive electrode current collecting tabs 7a are brought into close contact with each other with a portion (near the center) except the curved portions at both ends of the positive electrode current collecting tab 7a. Yes.
  • the positive electrode lead 12 and the positive electrode current collecting tab 7a are integrated by welding. The welding is performed by, for example, ultrasonic welding. Since the positive electrode lead 12 is electrically connected to the positive electrode terminal 3 which will be described in detail later, the positive electrode terminal 3 is connected to the positive electrode current collecting tab 7a through the positive electrode lead 12.
  • the negative electrode lead 14 is formed by bending a conductive plate into a U shape, and the negative electrode current collecting tabs 8a are brought into close contact with each other with a portion (near the center) except for the curved portions at both ends of the negative electrode current collecting tab 8a. Yes. Moreover, the negative electrode lead 14 and the negative electrode current collection tab 8a are integrated by welding. The welding is performed by, for example, ultrasonic welding. Since the negative electrode lead 14 is electrically connected to the negative electrode terminal 4 which will be described in detail later, the negative electrode terminal 4 is connected to the negative electrode current collecting tab 8 a via the negative electrode lead 14.
  • FIG. 5 is a perspective view of the positive electrode terminal 3
  • FIG. 6 is a perspective view of the positive electrode terminal 3 at an angle different from that of FIG.
  • the positive electrode terminal 3 has a substantially rectangular parallelepiped shape partially chamfered, a head 3-1 chamfered from one side surface to the opposite side surface, and a cylindrical shaft.
  • the head 3-1 is an upper surface 3-1a formed in the XY plane, a lower surface 3-1f facing the upper surface 3-1a, a chamfered portion, and a second side surface 3-1e connected to the shaft portion 3-2.
  • a first side surface 3-1b formed on the YZ plane so as to face the second side surface 3-1e, and a third side surface 3-1c and a fourth side surface 3 which are XZ planes facing each other. -1d is included.
  • the cylindrical shaft portion 3-2 extends from the second side surface 3-1e of the head portion 3-1.
  • the positive electrode terminal 3 is formed of a conductive material such as aluminum or an aluminum alloy, for example.
  • FIG. 7 shows the opening of the first exterior portion 5 from the back side, and a through hole 15 is formed in the inclined surface 5d.
  • plastic deformation occurs by caulking.
  • the positive electrode terminal 3 is integrated with the first exterior portion 5.
  • the boundary portion between the end surface of the shaft portion 3-2 of the positive electrode terminal 3 and the through-hole 15 may be welded with a laser or the like to make a stronger connection.
  • FIG. 8 is a perspective view of the negative electrode terminal 4
  • FIG. 9 is a perspective view of the negative electrode terminal 4 at an angle different from that of FIG.
  • the shape of the negative electrode terminal 4 is the same as the shape of the positive electrode terminal 3, and thus the description thereof is omitted.
  • the insulating cover 11 is formed so that the head portion 3-1 of the positive electrode terminal 3 and the head portion 4-1 of the negative electrode terminal 4 are wider than the area facing the first exterior portion 5. 4 is not electrically connected to the first exterior portion 5.
  • the insulating cover 11 is made of, for example, tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer (PFA), polypropylene (PP), polyethylene (PE), nylon, polybutylene terephthalate (PBT), polyethylene terephthalate (PET), poly It is formed from a thermoplastic resin such as tetrafluoroethylene (PTFE), polyphenylene sulfide (PPS), and polyether ether ketone (PEEK).
  • PFA tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer
  • PP polypropylene
  • PE polyethylene
  • nylon nylon
  • PBT polybutylene terephthalate
  • PET polyethylene terephthalate
  • PTFE tetrafluoroethylene
  • PPS polyphenylene sulfide
  • PEEK polyether ether ketone
  • FIG. 10 is a side view of the battery 100
  • FIG. 11 is an enlarged side view of the vicinity of the positive electrode terminal 3 in the battery 100.
  • the positive electrode terminal 3 is provided so as to protrude outward from the inclined surface 5 d of the first exterior part 5.
  • the positive electrode terminal 3 is provided with a flange of the first exterior part 5. It protrudes outside the portion 5b. Also in FIG. 11, the positional relationship is shown by dotted lines.
  • first side surface 3-1b of the positive electrode terminal 3 is perpendicular to the second exterior portion and perpendicular to the winding axis of the positive electrode current collecting tab 7a and the negative electrode current collecting tab 8a.
  • the upper surface 3-1a of the positive electrode terminal 3 is parallel to the second exterior portion 6.
  • the negative electrode terminal 4 is also provided so as to protrude outward from the inclined surface 5d of the first exterior portion 5 in the same manner as the positive electrode terminal 3.
  • the portion 5 protrudes outward from the flange portion 5b.
  • the first side surface 4-1b of the negative electrode terminal 4 is perpendicular to the second exterior portion and is perpendicular to the winding axis of the positive electrode current collecting tab 7a and the negative electrode current collecting tab 8a.
  • the upper surface 4-1a of the negative electrode terminal 4 is parallel to the second exterior portion 6.
  • the electrode group 2 is housed in the first exterior portion 5 so that the first end face 7 a faces the positive terminal 3 and the second end face 8 a faces the negative terminal 4.
  • the corner portion connecting the short side wall of the first exterior portion 5 and the bottom portion 5c there are gaps between the first end surface 7a and the second end surface 8a of the electrode group 2, respectively.
  • the volume of the battery is reduced by the volume of the concave portion. Therefore, the volume energy density of the battery can be increased.
  • the installation area of the terminal portion can be increased as compared with the case where the positive electrode terminal 3 and the negative electrode terminal 4 are provided on the short side surface having no inclined surface. Can do. Therefore, the diameter of the shaft portion 3-2 of the positive electrode terminal 3 and the shaft portion 4-2 of the negative electrode terminal 4 can be increased, so that a large current (high rate current) can flow with low resistance.
  • the second exterior part 6 functions as a lid for the first exterior part 5.
  • the electrode group 2 is sealed in the exterior member 1 by welding the four sides of the flange portion 5 b of the first exterior portion 5 and the second exterior portion 6.
  • the battery described above is an exterior member in which an electrode group is accommodated in a space formed by welding a stainless steel first exterior part and a stainless steel second exterior part having a flange part in an opening. including. Since the first and second exterior portions are made of stainless steel, high strength can be maintained even when the plate thickness of the first and second exterior portions is reduced. As a result, since the flexibility of the exterior member can be increased, the electrode group can be easily restrained by applying a load from the outside of the reduced pressure seal 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 surfaces of the first and second exterior parts to the electrode group, so that the heat dissipation of the battery can be improved. .
  • Stainless steel first and second exterior parts are easy to weld and can be sealed by inexpensive resistance seam welding. Therefore, it is possible to realize an exterior member having a higher gas sealing property than a laminate film container at a low cost. Moreover, the heat resistance of the exterior member can be improved.
  • SUS304 has a melting point of 1400 ° C.
  • Al has a melting point of 650 ° C.
  • the battery of the embodiment high strength and reliability can be obtained even when the thickness of the first and second exterior parts is reduced, so that the flexibility and heat dissipation are excellent, and the strength is high.
  • a highly reliable battery can be provided.
  • the opening area of the first exterior part is increased.
  • the second exterior part is welded to the four sides of the first exterior part, but as the opening area increases, the length of one side to be welded increases, so the three sides are welded first and the remaining one side It becomes easy to inject the electrolyte from the gap.
  • the exterior member can be temporarily sealed by providing a location where the welding strength is lower than the others, a temporary sealing component (for example, a rubber plug) can be made unnecessary.
  • the exterior member has a flat shape, the heat dissipation of the battery can be improved.
  • the first exterior portion includes a concave portion having an inclined surface, and the dead space in the first exterior portion can be reduced by arranging the terminal portion on the inclined surface, and the external terminal having a thick shaft portion diameter Therefore, it is possible to flow a large current (high rate current) with a low resistance.
  • An insulating member that reinforces the first exterior portion is disposed between the first lead and the inner surface of the first exterior portion, thereby insulating the first lead and the first exterior portion while The exterior part of 1 can be reinforced. Such an insulating member is useful for further reducing the thickness of the exterior member.
  • the plate thickness of the first exterior part and the second exterior part is preferably in the range of 0.02 mm to 0.3 mm. By setting it within this range, the conflicting properties of mechanical strength and flexibility can be achieved. A more preferable range of the plate thickness is 0.05 mm or more and 0.15 mm or less.
  • the exterior member can further include a safety valve or the like that can release the pressure inside the battery when the internal pressure of the battery rises above a specified value.
  • the positive electrode terminal 3 and the negative electrode terminal 4 protrude outward from the flange portion 5 b of the first exterior portion 5. Therefore, when the positive electrode terminal 3 and the negative electrode terminal 4 are connected, the first exterior part 5 and the second exterior part 6 do not interfere with each other, and the assembly property of the battery is improved.
  • the upper surface 3-1a of the positive electrode terminal 3 and the upper surface 4-1a of the negative electrode terminal 4 are parallel to the second exterior portion 6.
  • the probe is applied from the upper surface side of the positive electrode terminal 3 and the negative electrode terminal 4.
  • the probe can be applied vertically to the upper surfaces of the positive electrode terminal 3 and the negative electrode terminal 4. Therefore, the possibility that the probe is displaced is reduced, and the reliability of the charge / discharge operation is improved.
  • the battery according to the first embodiment may be a primary battery or a secondary battery.
  • An example of the battery according to the first embodiment is a lithium ion secondary battery.
  • FIG. 12 is a perspective view of the battery pack 101
  • FIG. 13 is a partially enlarged side view of the vicinity of the positive electrode terminal 3 and the negative electrode terminal 4 of the battery pack 101.
  • the battery 100 is laminated so that the first exterior portion 5 thereof faces the second exterior portion 6 of another battery 100, and the positive electrode terminal 3 and the negative electrode terminal 4 are stacked.
  • the positive electrode terminal 3 and the negative electrode terminal 4 are alternately arranged on one end face of the battery pack 101 so that they can be connected to each other.
  • the positive electrode terminal 3 and the negative electrode terminal 4 of the battery 100 constituting the battery pack 101 are electrically connected by a bus bar 102.
  • the bus bar 102 has a planar shape, and both ends of the bus bar 102 are connected to the positive terminal 3 and the negative terminal 4 by welding.
  • the positive electrode terminal 3 and the negative electrode terminal 4 of the battery 100 are provided so as to protrude outward from the flange portion 5b of the first exterior portion 5, as shown in FIG. 12 and FIG. Even if the bus bar 102 that electrically connects the negative electrode terminal 4 has a planar shape, it does not interfere with the first exterior portion 5 of the battery 100 having the flange portion 5b, and the positive electrode terminal 3 and the negative electrode terminal 4 do not interfere with each other. It can be connected. By doing in this way, the connection area of the bus bar 102, the positive electrode terminal 3, and the negative electrode terminal 4 can be taken more widely. As a result, a large current (high rate current) can flow through the bus bar 102 with low resistance. Although the bus bar 102 is shown as a planar shape, a part of the bus bar 102 may include a stress relaxation portion.
  • first side surface 3-1b of the positive electrode terminal 3 and the first side surface 4-1b of the negative electrode terminal 4 are perpendicular to the second exterior portion, and the positive electrode current collecting tab 7a and the negative electrode current collecting tab 8a are It is perpendicular to the winding axis. Therefore, the first side surface 3-1b of the positive electrode terminal 3 and the first side surface 4-1b of the negative electrode terminal 4 can be stacked in a state aligned in the Z-axis direction, and the welding surface with the bus bar 102 is on the YZ plane. You can put it out together.
  • the bus bar 102 is welded to the positive electrode terminal 3 and the negative electrode terminal 4 by, for example, a laser
  • the irradiation direction of the laser is determined in the X-axis direction. Since the welding direction is constant, the efficiency of the welding operation is improved.
  • the battery pack 103 will be described with reference to FIGS.
  • FIG. 14 is a perspective view of the battery pack 103.
  • the battery pack 103 has a plurality of batteries 100 arranged on the same plane.
  • the positive electrode terminal 3 and the negative electrode terminal 4 are butted against each other, and the butted portion is fixed by welding. Since the terminals can be connected to each other without using the bus bar, the number of bus bar parts can be reduced and a large current (high rate current) can flow between each electrode with low resistance.
  • FIG. 15 shows a portion where the positive electrode terminal 3 and the negative electrode terminal 4 are abutted.
  • the first side surface 3-1b of the positive electrode terminal 3 and the first side surface 4-1b of the negative electrode terminal 4 face each other and contact each other. Since the positive electrode terminal 3 and the negative electrode terminal 4 of the battery 100 are provided so as to protrude outward from the flange portion 5b of the first exterior part 5, the first exterior part 5 and the second exterior part of the battery 100 are provided.
  • the positive electrode terminal 3 and the negative electrode terminal 4 can be contacted without interfering with the part 6 or the like.
  • FIG. 16 shows a portion where the positive electrode terminal 3 and the negative electrode terminal 4 are not abutted and connected by the bus bar 104.
  • the bus bar 104 has a flat bar shape, and is connected to the upper surface 3-1a of the positive electrode terminal 3 and the upper surface 4-1a of the negative electrode terminal 4. Both the upper surface 3-1a of the positive electrode terminal 3 and the upper surface 4-1a of the negative electrode terminal 4 are parallel to the second exterior portion 6. Therefore, a flat bar-like object such as the bus bar 104 can be stably placed on the upper surface 3-1a and the upper surface 4-1a, respectively, and the welding operation is facilitated.
  • the welding surface is an XY plane, and therefore the laser irradiation direction is determined in the Z-axis direction. Since the welding direction is constant, the efficiency of the welding operation is improved.
  • the positive electrode terminal 3 and the negative electrode terminal 4 protrude outward from the flange portion 5 b of the first exterior portion 5. Therefore, even when the bus bar 104 is placed outside the flange portion 5b and welded to each terminal, even when the battery pack 103 as shown in FIG. There is no interference with the first exterior part 5 and the second exterior part 6. Therefore, the assemblability of the battery pack 103 is improved.
  • bus bar 104 is shown as a planar shape here, a stress relaxation portion may be provided in part.
  • FIG. 17 is a perspective view of the battery pack 105.
  • the battery pack 105 includes a plurality of batteries 100 arranged on the same plane.
  • the positive electrode terminal 3 and the negative electrode terminal 4 are butted against each other, and the butted portion is fixed by welding.
  • the positive electrode terminal 3 and the negative electrode terminal 4 which are not faced are electrically connected by a bus bar 106 having a flat bar shape.
  • FIG. 18 shows a portion in which the positive electrode terminal 3 and the negative electrode terminal 4 are not butted and connected by the bus bar 106.
  • the bus bar 106 has a flat bar shape and is connected to the first side surface 3-1b of the positive electrode terminal 3 and the first side surface 4-1b of the negative electrode terminal 4.
  • the first side surface 3-1b of the positive electrode terminal 3 and the first side surface 4-1b of the negative electrode terminal 4 are perpendicular to the second exterior portion, and are wound around the positive electrode current collecting tab 7a and the negative electrode current collecting tab 8a. Perpendicular to the axis.
  • the welding surface is a YZ plane, so that the laser irradiation direction is determined in the X-axis direction. Since the welding direction is constant, the efficiency of the welding operation is improved.
  • the bus bar 106 is located outside the flange portion 5b, and when the battery pack 105 as illustrated in FIG. 16 is stacked in the Z-axis direction, the bus bar 106 is connected to the first exterior portion 5 or the second exterior portion 6. There is no interference. Therefore, the assemblability of the battery pack 105 is improved.
  • the bus bar 106 is shown as a planar shape, but may be provided with a stress relaxation portion in part.
  • the welding work efficiency and assemblability of the bus bar for connecting the terminals of each battery 100 such as the battery packs 101, 103, and 105 are improved.
  • a battery pack capable of flowing a large current (high rate current) with low resistance can be realized.
  • the positive electrode, negative electrode, separator, and nonaqueous electrolyte of the battery 100 of the embodiment will be described below.
  • the positive electrode can include, for example, a positive electrode current collector, a positive electrode material layer held on the positive electrode current collector, and a positive electrode current collector 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 manganese dioxide (MnO 2 ) that occludes lithium, iron oxide, copper oxide, nickel oxide, lithium manganese composite oxide (eg, Li x Mn 2 O 4 or Li x MnO 2 ), Lithium nickel composite oxide (for example, Li x NiO 2 ), lithium cobalt composite oxide (for example, Li x CoO 2 ), lithium nickel cobalt composite oxide (for example, LiNi 1-y Co y O 2 ), lithium manganese cobalt composite oxide (e.g.
  • Li x Mn y Co 1-y O 2 lithium manganese nickel complex oxide having a spinel structure (e.g., Li x Mn 2-y Ni y O 4), lithium phosphates having an olivine structure (e.g., Li x FePO 4, Li x Fe 1- y Mn y PO 4, Li x CoPO 4), iron sulfate (Fe 2 (SO 4) 3 ), vanadium oxides (e.g. Examples thereof include V 2 O 5 ) and lithium nickel cobalt manganese composite oxide.
  • these compounds may be used alone, or a plurality of compounds may be used in combination.
  • 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 necessary in order to enhance the current collecting performance and suppress the contact resistance between the active material and the current collector.
  • Examples of the conductive agent include carbonaceous materials such as acetylene black, carbon black, and graphite.
  • the positive electrode active material and the binder are preferably blended at a ratio of 80% by mass to 98% by mass and 2% by mass to 20% by mass, respectively.
  • a sufficient electrode strength can be obtained by setting the binder to an amount of 2% by mass or more. Moreover, the content of the insulating material of an electrode can be reduced by setting it as 20 mass% or less, and internal resistance can be reduced.
  • the positive electrode active material, the binder, and the conductive agent are 77% by mass or more and 95% by mass or less, 2% by mass or more and 20% by mass or less, and 3% by mass or more and 15% by mass or less, respectively. It is preferable to mix
  • the conductive agent can exhibit the above-described effects by adjusting the amount to 3% by mass or more. Moreover, by setting it as 15 mass% or less, decomposition
  • the positive electrode current collector is preferably an aluminum foil or an aluminum alloy foil containing at least one element selected from Mg, Ti, Zn, Ni, Cr, Mn, Fe, Cu and Si.
  • the positive electrode current collector is preferably integral with the positive electrode current collecting tab.
  • the positive electrode current collector may be a separate body from the positive electrode current collector tab.
  • Negative electrode A negative electrode can contain the negative electrode collector, the negative electrode material layer hold
  • 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, a metal oxide, metal nitride, alloy, carbon, or the like that can occlude and release lithium ions can be used. It is preferable to use, as the negative electrode active material, a material that can occlude and release lithium ions at a potential of 0.4 V or higher (vs. Li / Li +).
  • the conductive agent is blended in order to enhance the current collecting performance and suppress the contact resistance between the negative electrode active material and the current collector.
  • Examples of the conductive agent include carbonaceous materials such as acetylene black, carbon black, and graphite.
  • the binder is blended to fill a gap between the dispersed negative electrode active materials 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 blended at a ratio of 68% by mass to 96% by mass, 2% by mass to 30% by mass, and 2% by mass to 30% by mass, respectively. It is preferable.
  • the amount of the conductive agent By setting the amount of the conductive agent to 2% by mass or more, the current collecting performance of the negative electrode layer can be improved. 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 exhibited, and excellent cycle characteristics can be expected.
  • the conductive agent and the binder are each preferably 28% by mass or less in order to increase the capacity.
  • the current collector a material that is electrochemically stable at the lithium insertion / release potential 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 collecting tab.
  • the negative electrode current collector may be a separate body from the negative electrode current collection tab.
  • the negative electrode is prepared by suspending a negative electrode active material, a binder and a conductive agent in a commonly used solvent to prepare a slurry, and applying this slurry to a current collector and drying to form a negative electrode material layer It is produced by applying a press.
  • the negative electrode may also be produced by forming a negative electrode active material, a binder, and a conductive agent in the form of a pellet to form a negative electrode material layer, which is disposed 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 nonwoven fabric.
  • a porous film formed from polyethylene or a polypropylene can melt
  • security can be improved.
  • At least one organic material selected from the group consisting of polyamideimide, polyamide, polyolefin, polyether, polyimide, polyketone, polysulfone, cellulose, polyvinyl alcohol (PVA), and polyvinylidene fluoride (PVdF) is formed into a string to form an electrode. You may make it adhere and function as a separator.
  • Electrolytic Solution for example, a nonaqueous electrolyte can be used.
  • the non-aqueous electrolyte may be, for example, a liquid non-aqueous electrolyte prepared by dissolving an electrolyte in an organic solvent, or a gel non-aqueous electrolyte in which a liquid electrolyte and a polymer material are combined.
  • the liquid non-aqueous electrolyte is preferably obtained by dissolving the electrolyte in an organic solvent at a concentration of 0.5 mol / L or more and 2.5 mol / L or less.
  • Examples of the electrolyte dissolved in the organic solvent include lithium perchlorate (LiClO 4 ), lithium hexafluorophosphate (LiPF 6 ), lithium tetrafluoroborate (LiBF 4 ), and lithium arsenic hexafluoride (LiAsF 6). ), Lithium trifluoromethanesulfonate (LiCF 3 SO 3 ), and lithium salts such as lithium bistrifluoromethylsulfonylimide [LiN (CF 3 SO 2 ) 2 ], and mixtures thereof.
  • the electrolyte is preferably one that is difficult to oxidize even at a high potential, and LiPF 6 is most preferred.
  • organic solvents examples include cyclic carbonates such as propylene carbonate (PC), ethylene carbonate (EC), and vinylene carbonate; such as diethyl carbonate (DEC), dimethyl carbonate (DMC), and methyl ethyl carbonate (MEC).
  • Chain carbonates cyclic ethers such as tetrahydrofuran (THF), 2 methyltetrahydrofuran (2MeTHF), and dioxolane (DOX); chain ethers such as dimethoxyethane (DME) and diethoxyethane (DEE); ⁇ -butyrolactone (GBL), acetonitrile (AN), and sulfolane (SL) are included.
  • These organic solvents can be used alone or as a mixed solvent.
  • polymer material examples include polyvinylidene fluoride (PVdF), polyacrylonitrile (PAN), and polyethylene oxide (PEO).
  • PVdF polyvinylidene fluoride
  • PAN polyacrylonitrile
  • PEO polyethylene oxide
  • a room temperature molten salt (ionic melt) containing lithium ions a polymer solid electrolyte, an inorganic solid electrolyte, or the like may be used as the non-aqueous electrolyte.
  • Room temperature molten salt refers to a compound that can exist as a liquid at room temperature (15 to 25 ° C.) among organic salts composed of a combination of an organic cation and an anion.
  • the room temperature molten salt includes a room temperature molten salt that exists alone as a liquid, a room temperature molten salt that becomes liquid when mixed with an electrolyte, and a room temperature molten salt that becomes liquid when dissolved in an organic solvent.
  • the melting point of a room temperature molten salt used for a nonaqueous electrolyte battery is 25 ° C. or less.
  • the organic cation generally has a quaternary ammonium skeleton.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

L'invention porte sur une batterie et sur un bloc-batterie, ladite batterie étant équipée d'un élément extérieur, dont la minceur et la flexibilité peuvent être améliorées et dont la fiabilité est excellente, et facilitant la fabrication du bloc-batterie. La batterie comprend un groupe d'électrodes, une surface inférieure et quatre surfaces latérales, revêt une forme de boîte rectangulaire comportant une partie bride au niveau d'une partie d'ouverture, et comprend un élément extérieur présentant une première partie extérieure et une seconde partie extérieure rectangulaire, le groupe d'électrodes étant logé dans un espace dudit élément extérieur qui est formé par soudage de la partie bride à la seconde partie extérieure, et ladite première partie extérieure comprenant une partie évidée présentant une surface inclinée au moins au niveau d'une partie coin entre la surface inférieure et une surface latérale. Une partie borne est perpendiculaire à la seconde partie extérieure, présente une première surface perpendiculaire à l'axe d'enroulement de languettes de collecteur d'électrode positive et négative, et fait saillie vers l'extérieur depuis la partie bride de la première partie extérieure.
PCT/JP2018/013148 2018-03-29 2018-03-29 Batterie et bloc-batterie WO2019186868A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2018/013148 WO2019186868A1 (fr) 2018-03-29 2018-03-29 Batterie et bloc-batterie

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2018/013148 WO2019186868A1 (fr) 2018-03-29 2018-03-29 Batterie et bloc-batterie

Publications (1)

Publication Number Publication Date
WO2019186868A1 true WO2019186868A1 (fr) 2019-10-03

Family

ID=68057986

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2018/013148 WO2019186868A1 (fr) 2018-03-29 2018-03-29 Batterie et bloc-batterie

Country Status (1)

Country Link
WO (1) WO2019186868A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002533908A (ja) * 1998-12-24 2002-10-08 エルジー・ケミカル・リミテッド 陥没面を有する角柱状容器を利用したリチウムイオン電池
JP2013206734A (ja) * 2012-03-28 2013-10-07 Sharp Corp 電源装置
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
JP2002533908A (ja) * 1998-12-24 2002-10-08 エルジー・ケミカル・リミテッド 陥没面を有する角柱状容器を利用したリチウムイオン電池
JP2013206734A (ja) * 2012-03-28 2013-10-07 Sharp Corp 電源装置
WO2016204147A1 (fr) * 2015-06-15 2016-12-22 株式会社 東芝 Batterie et bloc-batterie

Similar Documents

Publication Publication Date Title
JP6794502B2 (ja) 電池及び電池パック
US10559806B2 (en) Battery and battery module
JP6173730B2 (ja) 電池
JP6173729B2 (ja) 電池の製造方法
CN111033804B (zh) 蓄电模块以及电池组
CN111886715B (zh) 电池、电池组、蓄电装置、车辆以及飞翔体
WO2019186932A1 (fr) Batterie et bloc-batterie
JP6977181B2 (ja) 電池及び電池パック
WO2019186850A1 (fr) Batterie, bloc-batterie, dispositif de stockage d'énergie, véhicule, et objet volant
CN112243548B (zh) 电池、电池组、电池模块、蓄电装置、车辆以及飞行体
CN113169368B (zh) 电池、电池包、蓄电装置、车辆以及飞行体
WO2019186868A1 (fr) Batterie et bloc-batterie
WO2019187024A1 (fr) Batterie et bloc-batterie
WO2019049377A1 (fr) Batterie et bloc-batterie
WO2019186969A1 (fr) Bloc-batterie

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 18911704

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 18911704

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: JP