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WO2018179794A1 - Bloc-batterie - Google Patents

Bloc-batterie Download PDF

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Publication number
WO2018179794A1
WO2018179794A1 PCT/JP2018/002987 JP2018002987W WO2018179794A1 WO 2018179794 A1 WO2018179794 A1 WO 2018179794A1 JP 2018002987 W JP2018002987 W JP 2018002987W WO 2018179794 A1 WO2018179794 A1 WO 2018179794A1
Authority
WO
WIPO (PCT)
Prior art keywords
battery
fuse link
batteries
battery pack
holder
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2018/002987
Other languages
English (en)
Japanese (ja)
Inventor
秀実 栗原
中野　雅也
孝夫 高津
聡 河上
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sanyo Electric Co Ltd
Original Assignee
Sanyo Electric Co Ltd
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 Sanyo Electric Co Ltd filed Critical Sanyo Electric Co Ltd
Publication of WO2018179794A1 publication Critical patent/WO2018179794A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/213—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for cells having curved cross-section, e.g. round or elliptic
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/244—Secondary casings; Racks; Suspension devices; Carrying devices; Holders characterised by their mounting method
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/262—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders with fastening means, e.g. locks
    • H01M50/264—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders with fastening means, e.g. locks for cells or batteries, e.g. straps, tie rods or peripheral frames
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/289—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by spacing elements or positioning means within frames, racks or packs
    • H01M50/293—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by spacing elements or positioning means within frames, racks or packs characterised by the material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present invention relates to a battery pack in which a plurality of batteries arranged in a fixed position by a battery holder are connected in series or in parallel by a bus bar, and in particular, a battery pack in which a fuse link that melts due to an overcurrent of the battery is provided in the bus bar.
  • a battery pack in which a fuse link that melts due to an overcurrent of the battery is provided in the bus bar.
  • a bus bar is a metal plate that connects batteries in series or in parallel, and is manufactured by cutting a single metal plate.
  • a base part for connecting batteries in series or in parallel and a fixed terminal connected to an electrode terminal of the battery are connected by a fuse link. Since the fixed terminal is connected to the base portion via the fuse link, the fixed terminal is designed to blow when the battery current, that is, the current flowing through the fixed terminal becomes larger than the set current.
  • the set current at which the fuse link is melted can be adjusted by the electric resistance of the fuse link
  • the set current is adjusted by making the fuse link of a metal plate having a high conductivity thin.
  • the fuse link is thinned to increase the electric resistance so that it generates heat and blows when a set overcurrent flows.
  • the fuse link is heated by overcurrent Joule heat and blown. Joule heat is specified by the product of the square of the current and the electrical resistance. Therefore, the fuse link adjusts the electrical resistance to specify the set current to be blown.
  • the electrical resistance of the fuse link is adjusted by narrowing the fuse link. Since the bus bar is made of a metal plate having a high conductivity, that is, an electric flow, the bus bar is formed as a thin fuse link in order to increase the electric resistance.
  • the thin fuse link has a drawback that it is easily broken due to the impact and vibration of the battery pack dropping.
  • the present invention was developed for the purpose of solving the above drawbacks.
  • An important object of the present invention is to prevent the fuse link from losing its fuse function in various applications by cutting the fuse link so that it is blown at a set overcurrent while preventing it from being broken by vibration or impact.
  • the object is to provide a battery pack having excellent impact properties.
  • the above battery pack prevents the thin fuse link that melts at the set current from being broken by vibration or impact, improves impact resistance, and can be used safely without losing the fuse function in various applications. Realize features.
  • This feature is that the battery pack described above is provided with a first fitting portion in the fuse link connecting portion connecting the base portion of the fuse link, and the first fitting portion is provided in the battery holder. This is because the second fitting portion is connected and the fuse link connecting portion is connected to the battery holder so as not to move to the battery holder.
  • the battery pack according to an aspect of the present invention can be a connecting rib formed by integrally forming the second fitting portion on the battery holder with the first fitting portion as a fitting hole.
  • the battery pack of a certain aspect has a first fitting part provided in the fuse link connecting part in the vicinity of the root part of the fuse link or a distance (k) between the first fitting part and the base part of the fuse link. Or less than 5 times the fuse link lateral width (W), or a first terminal portion is provided in the fuse link connecting portion located between the adjacent fixed terminals, and the first fitting portion is also a fuse link.
  • It is a connection part, Comprising: It can arrange
  • a battery pack in which an electrode window for exposing an electrode terminal of a battery stored in a fixed position is provided in the battery holder, and the battery holder is further provided with a support surface at a position facing the inner surface of the fuse link.
  • the fuse link can be disposed in contact with or in close proximity to the support surface, and the electrode window can be a square and the support surface can be disposed outside the opening edge of the electrode window.
  • FIG. 1 is a schematic exploded perspective view of a battery pack according to an embodiment of the present invention. It is a vertical cross-sectional view of the battery holder of the battery pack shown in FIG. It is a front view which shows the state which fixed the bus bar of the battery holder shown in FIG. It is a rear view which shows the state which fixed the bus bar of the battery holder shown in FIG. It is a front view of the bus bar of the battery pack shown in FIG.
  • FIG. 6 is a partially enlarged cross-sectional view of the bus bar shown in FIG. 5. FIG. 6 is a partially enlarged cross-sectional view of the bus bar shown in FIG. 5. It is a partially expanded sectional view of the battery holder of the battery pack shown in FIG.
  • FIG. 1 It is an expanded sectional view of the center part of the battery holder of the battery pack shown in FIG. It is a front view of the holder unit of the battery pack shown in FIG. It is a schematic circuit diagram which shows the connection state of the battery of the battery pack shown in FIG.
  • each element constituting the present invention may be configured such that a plurality of elements are constituted by the same member and the plurality of elements are shared by one member, and conversely, the function of one member is constituted by a plurality of members. It can also be realized by sharing.
  • the battery pack of the present invention is mainly used as a power source for power.
  • This battery pack is used as a power source for an electric device driven by a motor such as an electric tool, an electric assist bicycle, an electric motorcycle, an electric wheelchair, an electric tricycle, and an electric cart.
  • a motor such as an electric tool, an electric assist bicycle, an electric motorcycle, an electric wheelchair, an electric tricycle, and an electric cart.
  • the present invention does not specify the use of the battery pack, and various electric devices used indoors and outdoors such as electric devices other than electric devices such as cleaners, wireless devices, lighting devices, digital cameras, and video cameras. It can be used as a power source for equipment.
  • FIG. 1 shows a battery pack according to an embodiment of the present invention.
  • the battery pack in this figure includes a plurality of batteries 1 that can be charged, a battery holder 2 in which the plurality of batteries 1 are arranged in a fixed position, and a plurality of batteries 1 that are arranged in a fixed position in the battery holder 2 in series and in parallel. And a bus bar 3 connected to the.
  • the battery holder 2 has a plurality of batteries 1 arranged in parallel to each other, and both ends thereof are arranged in the same plane and arranged in a fixed position. Further, the battery pack is assembled by storing a battery holder 2 in which a plurality of batteries 1 are arranged at fixed positions in an outer case (not shown).
  • the battery 1 is a cylindrical battery.
  • an electrode body is housed in a cylindrical outer can, filled with an electrolytic solution, and an opening of the outer can is sealed with a sealing plate.
  • the cylindrical battery uses positive and negative electrode terminals for the bottom surface of the outer can as both end surfaces and the convex electrode provided at the center of the sealing plate.
  • Cylindrical batteries having positive and negative electrode terminals on both end faces are arranged in parallel with the battery holder 2, the electrode terminals on both ends are exposed on both faces of the battery holder 2, and are connected in series and in parallel by the bus bar 3.
  • the battery 1 is a cylindrical battery, but the present invention is not limited to a cylindrical battery, and may be a square battery, for example.
  • the battery is a non-aqueous electrolyte secondary battery 1 such as a lithium ion battery.
  • the present invention does not specify the battery as a lithium ion battery, and all secondary batteries that are currently used and will be developed, such as other nonaqueous electrolyte secondary batteries and nickel metal hydride batteries, can be used.
  • the battery holder 2 is formed into a predetermined shape by a resin such as a thermoplastic resin which is an insulating material.
  • the battery holder 2 can be preferably made of a resin excellent in flame retardancy.
  • a resin for example, PC (polycarbonate) or PP (polypropylene) can be used.
  • the battery holder 2 inserts a plurality of batteries 1 into the battery housing portion 4 and arranges them in a fixed position in a parallel posture.
  • the battery 1 is inserted into the battery housing portion 4, and the electrode terminals provided on both end surfaces are arranged on the same plane and are exposed on both surfaces of the battery holder 2.
  • the battery holder 2 is provided by partitioning the battery housing portion 4 with a partition wall 5.
  • the partition wall 5 contacts the outer peripheral surface of the battery 1 in a thermally coupled state.
  • the partition wall 5 thermally coupled to the battery 1 conducts heat generated by the battery 1 and absorbs heat generated by the battery 1.
  • the partition wall 5 that divides the battery storage unit 4 is located between the adjacent batteries 1, the surface is brought into contact with the surface of the battery 1, and is thermally coupled to the battery 1. Deploy.
  • the battery storage section 4 partitioned by the partition walls 5 has the inner surface along the outer peripheral surface of the battery 1 because the battery 1 is inserted inside and placed at a fixed position.
  • the battery holder 2 shown in the drawing inserts a cylindrical battery into the battery housing part 4 and arranges it at a fixed position, so that the battery housing part 4 has a cylindrical shape inside.
  • the cylindrical battery storage unit 4 has an inner diameter slightly larger than the outer diameter of the cylindrical battery, and is thermally coupled to the cylindrical battery and disposed at a fixed position. Since the battery accommodating part 4 is divided by the partition 5, the surface of the partition 5 arrange
  • the battery holder 2 shown in FIGS. 1 and 2 has a shape in which a plurality of battery storage portions 4 are arranged in a multi-row multi-stage in a “stacked state” in a parallel posture.
  • the battery holder 2 includes a partition wall 5 between the batteries, and an outer peripheral wall 9 formed integrally with the partition wall 5 and provided on the outer periphery of the battery holder 2.
  • the battery holder 2 is provided with a battery storage portion 4 disposed on the outer peripheral portion between the outer peripheral wall 9 and the partition wall 5, and the battery storage portion 4 disposed on the inside between the partition walls 5.
  • the partition wall 5 and the outer peripheral wall 9 are arranged at fixed positions by being thermally coupled to the battery 1 with the battery contact surface being shaped along the surface of the battery 1.
  • the battery holder 2 shown in the figure arranges the battery storage portions 4 in a stacked state.
  • the battery holder 2 has a feature that the battery 1 can be arranged in a space-efficient manner to make the whole compact. Further, by saving the resin in the valley portion, there is a feature that the amount of the resin to be used can be reduced, the manufacturing cost can be reduced, and the weight can be reduced.
  • the battery holder can arrange the batteries arranged in multiple rows and columns in the vertical and horizontal directions, and arrange the batteries at intersections in a grid pattern.
  • the battery holder 2 of FIG. 2 arranges 112 batteries 1 in 8 rows and 14 rows.
  • one row of batteries 1 arranged in the vertical direction is arranged in a zigzag shape, and the batteries 1 in the next row are arranged in a zigzag valley and arranged in a stacked state.
  • the partition walls 5 are arranged between the batteries 1 arranged in multiple stages and multiple rows.
  • the battery storage unit 4 is provided by the partition walls 5, and the battery 1 is arranged between the partition walls 5. The heat is conducted to the partition wall 5.
  • the battery holder 2 has a partition provided at the center as a heat insulating partition 5A.
  • the heat insulating partition wall 5A is located at the center of the battery holder 2 and divides the battery 1 on both sides into two blocks on the left and right in the figure to prevent heat diffusion between the blocks.
  • the heat insulating divided partition wall 5A is divided into two blocks as a whole, and further absorbs the heat generated by the batteries 1 arranged on both sides to reduce the temperature rise of the battery 1 at the center.
  • the heat insulating dividing partition 5A divides the battery 1 into two blocks on both sides between the batteries 1 in the center (rows A and B in FIG. 2).
  • the heat insulating divided partition wall 5A is provided with the opposing partition walls 5B on both sides of the air layer 6, it is thicker than the partition wall 5, and the inter-battery distance (S1) disposed on both sides is a battery disposed on the blocks divided on both sides. It becomes larger than the distance (S2).
  • the heat insulating partition wall 5A provided in the central portion divides the entire battery 1 into blocks on both sides and insulates even in a state where the calorific value of the battery 1 is increased by a continuous large current, thereby preventing heat diffusion between the blocks. In addition, heat is dissipated while being insulated to effectively prevent the temperature of the battery 1 at the center from rising.
  • the heat insulating partition wall 5A is provided with opposing partition walls 5B on both sides of the air layer 6 that is not sealed.
  • the opposing partition wall 5B thermally couples one surface to the battery 1 to absorb the heat energy of the battery 1, and exposes the other surface to the air layer 6 to radiate the absorbed heat energy into the air.
  • the battery holder 2 in FIGS. 1 and 2 has the batteries 1 arranged in multiple rows and columns, and in the drawing, has a block shape elongated in the horizontal direction.
  • the battery holder 2 that is elongated in the horizontal direction has a higher battery 1 temperature in the central portion in the longitudinal direction, and therefore, the heat insulating partition wall 5A is disposed in the central portion in the longitudinal direction.
  • the heat insulating partition walls 5A provided between the batteries 1 arranged in a zigzag form the batteries 1 on both sides in a zigzag shape.
  • the opposing partition wall 5B shown in the enlarged cross-sectional view of FIG. 9 is connected at the closest position 50 where the adjacent batteries 1 are closest to each other, and the inner width is widened in the region surrounded by the three batteries 1 to increase the internal volume. Has increased.
  • the battery holder 2 in FIGS. 1 and 2 has a heat insulating divided partition wall 5 ⁇ / b> A disposed at the center in the longitudinal direction, and the heat insulating divided partition wall 5 ⁇ / b> A has a shape extending in a direction intersecting the longitudinal direction of the battery holder 2.
  • the pair of opposed partition walls 5 ⁇ / b> B are provided with an air layer 6 apart in the longitudinal direction of the battery holder 2.
  • the batteries 1 arranged in a stack are arranged with the centers of the three batteries 1 a, 1 b, and 1 ° C. at the apexes of the triangle.
  • an air layer 6 is provided by separating the opposing partition wall 5B by a distance (d) between the batteries 1a and 1b arranged in the longitudinal direction of the battery holder 2.
  • a pair of opposing partition walls 5B is connected as the closest position 50 between the batteries 1b and 1c.
  • a partition wall 5 without an air layer is disposed between the batteries 1c and 1a.
  • the battery holder 2 in FIG. 9 has a structure in which a pair of opposed partition walls 5B arranged between the batteries 1b and 1c are connected as the closest position 50, that is, the opposed partition wall 5B in this part is thickened as a two-layer structure,
  • the distance (S1) between the batteries can be increased by providing an interval (d) in the opposing partition wall 5B between the batteries 1a and 1b. Therefore, the air layer 6 can be provided between the opposing partition walls 5B while locally connecting the pair of opposing partition walls 5B.
  • the battery holder 2 connecting the pair of opposed partition walls 5B can connect the partition walls 5 arranged on both sides of the battery holder 2 via the heat insulating partition walls 5A in an integrated structure, so that the air layer 6 is provided on the heat insulating partition wall 5A in the center.
  • the whole battery holder 2 can be integrated. For this reason, it is not necessary to connect the battery holder 2 separately molded on both sides of the heat insulating divided partition wall 5A with an outer case while providing the heat insulating divided partition wall 5A with the air layer 6 in the center.
  • the battery holder 2 in FIG. 2 is arranged so that the heat insulating partition wall 5A extends to the opposing surface (upper and lower surfaces in the figure). That is, the overall length of the heat insulating partition 5 ⁇ / b> A is substantially equal to the thickness of the battery holder 2.
  • This battery pack can effectively prevent the temperature rise of the battery 1 arranged at the center of the elongated battery holder 2 with the heat insulating partition wall 5A.
  • the heat insulating partition wall 5A it is not always necessary to dispose the heat insulating partition wall 5A over the entire width of the battery holder 2, and the length of the heat insulating partition wall 5A is not less than 1/3 of the thickness of the battery holder 2, preferably 1 / 2 or more can also prevent the temperature rise of the battery 1 in the center.
  • the battery holder 2 shown in FIG. 1 is composed of a pair of holder units divided in the middle.
  • the holder unit has an electrode window 7 that exposes electrode terminals at both ends of the battery 1 at both ends of the battery housing portion 4 through which the battery 1 is inserted and held, and the electrode of the battery 1 that is exposed from the electrode window 7.
  • the shape is such that the bus bar 3 can be connected to the terminal.
  • the electrode window 7 that exposes one electrode terminal of the battery 1 has a quadrangular shape.
  • the electrode window 7 exposing the other electrode terminal is circular.
  • the electrode window 7 is smaller than the outer shape of the battery 1 so that the battery 1 does not pass through, and the battery 1 is disposed in the battery housing portion 4.
  • the battery holder 2 shown in FIG. 1 is composed of a pair of holder units 2A divided in the middle.
  • the holder unit 2 ⁇ / b> A has an electrode window 7 that exposes electrode terminals at both ends of the battery 1 at both ends of the battery housing portion 4 through which the battery 1 is inserted and held, and the battery unit 1 exposed from the electrode window 7.
  • the bus bar 3 can be connected to the electrode terminal.
  • the electrode window 7 that exposes the negative electrode terminal of the battery 1 is rectangular, and the electrode window 7 that exposes the positive electrode terminal is circular.
  • the electrode window 7 is smaller than the outer shape of the battery 1 so that the battery 1 does not pass through, and the battery 1 is disposed in the battery housing portion 4.
  • the length of the battery housing portion 4 formed by the pair of holder units 2A is approximately half the total length of the battery 1.
  • the holder unit 2A is connected to each other, and the battery 1 is inserted into the battery housing portion 4 provided by the pair of holder units 2A to cover the entire outer peripheral surface of the battery 1. In this way, the structure in which the entire outer peripheral surface of the battery 1 is covered with the battery housing portion 4 can effectively prevent the similar burning between adjacent batteries.
  • the bus bar 3 in FIG. 1 connects a plurality of batteries 1 arranged in multiple stages and multiple rows in series and in parallel.
  • the bus bar 3 is a conductive metal plate, a plurality of fixed terminals 3A connected to the electrode terminals of the battery 1, a base portion 3B connecting the plurality of batteries 1 in series and in parallel via the fixed terminals 3A, and a tip end
  • the fuse link 3C is connected to the fixed terminal 3A and the base portion is connected to the base portion 3B.
  • the bus bar 3 is manufactured by cutting one metal plate with a die and bending it.
  • FIG. 2 is a front view of the bus bar 3 disposed on the surface of the battery holder 2
  • FIG. 3 is a front view of the bus bar 3 disposed on the back surface of the battery holder 2.
  • the battery holder 2 has eight bus bars 3 arranged on the front and back surfaces, and the batteries 1 are connected in parallel and in series with the bus bar 3.
  • the fixed terminal 3A is connected to the electrode terminal of the battery 1 by spot welding.
  • the fixed terminal 3A is provided with a weld 3E at the tip of the step 3D. Further, the fixed terminal 3A is provided with a gap 3F between the fixed portion 3A and the base portion 3B to separate the welded portion 3E from the base portion 3B.
  • the welded portion 3E is disposed inside the electrode window 7 provided in the battery holder 2 and is connected to the electrode terminal of the battery 1 by spot welding.
  • the stepped portion 3D projects the welded portion 3E separated from the base portion 3B toward the electrode terminal, and contacts and connects the welded portion 3E to the electrode terminal inside the electrode window.
  • a welded portion 3E that protrudes toward the electrode terminal through the stepped portion 3D is inserted into the electrode window 7 of the battery holder 2 and comes into contact with the electrode terminal disposed on the inner surface of the electrode window 7.
  • the welded portion 3E is provided with two convex portions 3G protruding locally toward the electrode terminal on both sides of the slit 3H, and the convex portion 3G is connected to the electrode terminal by spot welding.
  • the slit 3H reduces the reactive current and efficiently welds the convex portion 3G to the electrode terminal.
  • the fixed terminal 3A includes a first fixed terminal 3Aa connected to the base part 3B via the fuse link 3C and a second fixed terminal 3Ab connected directly to the base part 3B without going through the fuse link. Become.
  • the first fixed terminal 3Aa connects the fuse link 3C between the stepped portion 3D and the welded portion 3E.
  • the second fixed terminal 3Ab directly connects the step portion 3D to the base portion 3B.
  • the fuse link 3C is connected to the negative electrode terminal of the battery 1
  • the first fixed terminal 3Aa is connected to the negative side of the battery 1
  • the second fixed terminal 3Ab is connected to the battery 1 of the battery 1. Connect to the positive electrode terminal.
  • the fuse link 3C is provided at a position facing the support surface 2B provided on the battery holder 2, in other words, the battery holder 2 is provided with a support surface 2B on the surface facing the fuse link 3C.
  • the fuse link 3C is in a position in contact with or close to the support surface 2B of the battery holder 2, and deformation and breakage are prevented by the support surface 2B.
  • the step of the step portion 3D is set so that the fuse link 3C is in contact with or close to the support surface 2B. That is, the step 3D sets the step of the step 3D so that the fuse link 3C is in contact with or close to the support surface 2B while the weld 3E is fixed to the electrode terminal.
  • the welded portion 3E is fixed to the electrode terminal, and the fuse link 3C can be brought into contact with or close to the support surface 2B.
  • the battery holder 2 of FIG. 1 has a rectangular electrode window 7 and a support surface 2B of the fuse link 3C provided outside the opening edge of the electrode window 7.
  • the battery holder 2 in which the electrode window 7 has a quadrangular shape and the support surface 2B is provided on the outer side of the electrode window 7 has a feature that the support surface 2B is provided at the opposing position on the entire surface of the fuse link 3C, so that deformation and breakage of the entire fuse link 3C can be reliably prevented. .
  • the base part 3B is the other part of the bus bar 3 excluding the fixed terminal 3A and the fuse link 3C, and connects all the batteries 1 connected to the fixed terminal 3A in parallel and in series.
  • the bus bar 3 is formed by pressing a single metal plate, cutting it into a shape in which a plurality of fixed terminals 3A and fuse links 3C are arranged, bending the fixed metal 3A.
  • a base portion 3B is provided between the outer side of the first and the adjacent fixed terminals 3A.
  • the bus bar 3 is located between the adjacent fixed terminals 3A, and the base portion 3B connecting the base portion of the fuse link 3C is used as the fuse link connecting portion 3Ba.
  • the fuse link connecting portion 3Ba is provided with a first fitting portion 3I connected to the battery holder 2 in order to prevent relative movement with the battery holder 2.
  • the first fitting portion 3I is connected to a second fitting portion 2C provided in the battery holder 2.
  • the second fitting portion 2C is connected to the first fitting portion 3I, and the fuse link connecting portion 3Ba is connected to the battery holder 2 so as not to move relatively.
  • the structure in which the fuse link connecting portion 3Ba and the battery holder 2 do not move relative to each other prevents the relative movement between the battery 1 and the fuse link 3C.
  • the fuse link 3C Since the battery 1 is disposed at a fixed position of the battery holder 2 and the fuse link 3C is connected to the fuse link connecting portion 3Ba, the fuse link 3C is connected to the battery 1 via the battery holder 2 so as not to move relatively. Because.
  • the structure in which the battery 1 and the fuse link 3C do not move relative to each other can prevent the fuse link 3C from being deformed in a state where the battery pack receives an impact or vibration. For this reason, the fuse link 3C can be prevented from being broken even when a shock such as dropping of the battery pack is received.
  • the bus bar 3 in FIGS. 6 and 7 has a first fitting portion 3 ⁇ / b> I as a fitting hole and a second fitting portion 2 ⁇ / b> C as a connecting rib formed on the battery holder 2.
  • the fitting hole is provided by cutting the bus bar 3, and the connecting rib is provided integrally with the battery holder 2.
  • the outer shape of the connecting rib is substantially the same as the inner shape of the fitting hole, but is sized to be inserted.
  • the bus bar 3 shown in the figure has a circular fitting hole and a cylindrical connecting rib, so that the inner diameter of the fitting hole is slightly larger than the outer diameter of the connecting rib.
  • This structure inserts a connecting rib into the fitting hole at the time of assembly, connects the fuse link connecting portion 3Ba to the battery holder 2 so as not to move relative to each other, and prevents relative movement between the fuse link 3C and the battery 1.
  • the deformation of the fuse link 3C can be reliably prevented.
  • This structure has the feature that it can be easily assembled.
  • the connecting rib can be integrally formed in the process of forming the battery holder 2 by cutting the metal plate to be the bus bar 3 and forming the battery holder 2, the manufacturing process can be simplified.
  • the first fitting portion 3I is used as a fitting convex portion
  • the second fitting portion 2C is a fitting concave portion or fitting hole in which the fitting convex portion can be fitted. You can also
  • the first fitting portion 3I is disposed in the vicinity of the root portion of the fuse link 3C.
  • the distance (k) between the first fitting portion 3I and the root portion of the fuse link 3C is set to be not more than 5 times the lateral width (W) of the fuse link 3C, so that the deformation of the fuse link 3C can be further reduced.
  • the first fitting portion 3I provided in the fuse link connecting portion 3Ba is arranged on the extension line of the base portion of the fuse link 3C, and the first fitting portion 3I is connected to the fuse link 3C. Place it at a position close to the base of the.
  • This structure is also characterized in that the first fitting portion 3I and the second fitting portion 2C can more reliably prevent the deformation of the fuse link 3C and effectively prevent the deformation and damage.
  • the bus bar 3 is provided with a positioning hole 3K in the base portion 3B between the fixed terminals 3A located on the left and right sides in FIGS.
  • a connecting rib formed integrally with the battery holder 2 is inserted, and the bus bar 3 is arranged at a fixed position of the battery holder 2.
  • the positioning holes 3K and the connecting ribs also have an effect of preventing the relative movement between the bus bar 3 and the battery holder 2 while arranging the bus bar 3 at a fixed position of the battery holder 2.
  • Each bus bar 3 arranged on the surface of the battery holder 2 connects the batteries 1 arranged in the vertical direction in the drawing in parallel and connects the batteries 1 adjacent to each other in the horizontal direction in series. .
  • the bus bar 3 arranged on the back surface of the battery holder 2 is connected to the bus bar 3 which is arranged on both sides and is connected in parallel to the battery 1 arranged in one row in the vertical direction, and the two rows of batteries 1 are connected in parallel.
  • the bus bar 3 In the same manner as the bus bar 3 on the surface of the battery holder 2, the bus bar 3 for connecting the two rows of batteries 1 in parallel connects the batteries 1 in each row in parallel and connects the batteries 1 in the next row in series. is doing.
  • the bus bar 3 has a first fixed terminal 3Aa connected to one electrode terminal of the battery 1 via a fuse link 3C.
  • FIG. 11 shows a schematic circuit diagram in which a plurality of batteries 1 are connected in parallel and in series.
  • the battery pack having the circuit configuration shown in this circuit diagram has a fuse link 3 ⁇ / b> C connected to the negative side of each battery 1.
  • Each battery 1 is connected to the negative side because the fixed terminal 3A of the bus bar 3 is connected to the positive side and the negative side, and the fuse link 3C is connected to the first fixed terminal 3Aa connected to the negative side.
  • the fuse link 3C is connected to the half of the first fixed terminals 3Aa.
  • the bus bar 3 is spot welded or laser welded to connect the fixed terminal 3A to the electrode terminal of the battery 1.
  • the battery holder 2 is provided with a positioning recess for arranging the bus bar 3 at a fixed position on both sides.
  • FIG. 8 is an enlarged front view of the lower left portion of FIG.
  • the batteries 1 shown in this figure are arranged in multiple rows by connecting the batteries 1 arranged in multiple stages (placed up and down in the figure) in parallel via bus bars 3 (indicated by chain lines). Are connected in series (disposed in the left-right direction in the figure).
  • the bus bar 3 can connect the batteries 1 arranged in multiple stages in series and connect the batteries 1 arranged in multiple rows in parallel.
  • the bus bars 3 are arranged on both sides of the air layer provided in the heat insulating partition wall, are arranged on both surfaces of the battery holder 2 without sealing the air layer, and connect the batteries 1 in series and in parallel.
  • the above battery pack has a feature that can prevent induction of thermal runaway of the battery.
  • a battery pack in which a plurality of batteries 1 are arranged close to each other and arranged in multiple rows and columns and connected in series and in parallel by a bus bar 3 causes abnormal heat generation due to thermal runaway of any one of the batteries 1. Then, the thermal energy of the battery 1 that has run out of heat is transferred to the adjacent battery 1 to cause the adjacent battery 1 to run out of heat.
  • the thermal runaway is induced in the adjacent battery 1, the generated thermal energy is remarkably increased and the safety is lowered. Induction of thermal runaway occurs with higher probability between batteries connected in parallel (hereinafter referred to as parallel batteries) than between batteries connected in series (hereinafter referred to as series batteries).
  • the batteries 1 connected in parallel are heated by the thermally runaway battery 1 and a large short-circuit current flows through the thermally runaway battery 1.
  • the thermal runaway of the battery 1 is largely caused by an internal short circuit. Therefore, the battery 1 connected in parallel to the battery 1 that has undergone an internal short circuit and is thermally runaway generates a large short current and generates heat due to Joule heat. Since Joule heat increases in proportion to the square of the current, a large short-circuit current generates a very large amount of heat, and the battery 1 temperature is rapidly increased.
  • the fuse link connected to each battery can set the maximum current so as to be blown by an excessive short current, thereby preventing the battery from causing thermal runaway.
  • the series battery 1 connected in series adjacent to the battery 1 that has abnormally heated due to thermal runaway does not pass through the battery 1 that has abnormally generated heat even though heat energy is conducted from the battery 1 that has abnormally generated heat. No short current flows and no heat is generated by Joule heat. For this reason, the series battery 1 connected in series with the battery 1 that has abnormally generated heat is less likely to induce thermal runaway than the parallel battery 1 connected in parallel and does not burn due to thermal runaway.
  • the battery holder 2 in FIG. 9 is provided with a heat insulating layer 10 disposed between the battery 1 and a specific part of the partition wall in order to prevent induction of thermal runaway of the battery 1.
  • the heat insulating layer 10 insulates a specific part of the partition wall, prevents induction of thermal runaway due to abnormal heat generation of the battery 1, and prevents similar burning of the battery 1 that has undergone thermal runaway.
  • the heat insulation layer 10 is provided in the approach portion 5C of the partition wall between the parallel batteries 1 to insulate the parallel batteries and prevent the thermal runaway between the batteries connected in parallel.
  • the heat insulating layer 10 is not provided on the partition walls 5 between the series batteries 1, and in the partition walls between the series batteries 1, the heat energy of the battery 1 that has abnormally generated heat is conducted to reduce the temperature of the battery 1 that has abnormally generated heat.
  • the heat insulation layer 10 provided in the approach part 5C of the partition wall between the parallel batteries 1 blocks the thermal energy conducted from the abnormally heated battery 1 to the adjacent parallel battery 1 to prevent thermal runaway. Since the thermal runaway of the battery 1 is likely to occur in the battery 1 that is arranged adjacently and connected in series, that is, the parallel battery 1 that is arranged adjacently and connected in parallel to the series battery 1, The heat conduction energy between them is blocked by the heat insulating layer 10 provided in the approaching portion 5C of the partition wall between the parallel batteries 1.
  • the series battery 1 connected in series which is unlikely to induce thermal runaway, conducts heat with a partition provided between them, and conducts heat energy of the abnormally heated battery 1 to the adjacent series battery 1, The temperature of the battery 1 that has abnormally generated heat is decreased.
  • the partition wall 5 between the series batteries is not provided with the heat insulating layer 10 as the partition wall approaching part 5C between the parallel batteries 1, and the thermal energy of the battery 1 that has abnormally heated is formed adjacent to the surface of the battery 1 by the heat coupling state.
  • the series battery 1 is thermally conducted to dissipate heat.
  • the partition wall 5 between the series batteries without the heat insulating layer 10 efficiently dissipates the heat energy of the battery 1 that has abnormally heated to the adjacent series battery 1 to dissipate the heat, so that the temperature of the battery 1 that has abnormally heated can be quickly reduced.
  • the battery holder 2 described above conducts the heat energy of the abnormally heated battery 1 to the adjacent series battery 1 via the partition wall 5 between the series batteries when any one of the batteries 1 is thermally runaway and abnormally generates heat.
  • the temperature of the abnormal heat generating battery 1 is quickly decreased, and the thermal energy conducted by the heat insulating layer 10 is shut off at the approaching portion 5C of the partition wall between the adjacent parallel batteries 1 where thermal runaway is likely to be induced. Induction of thermal runaway of battery 1 is prevented.
  • the thermal energy of the battery 1 which has run out of heat does not conduct in the same way to both the adjacent series battery 1 and the parallel battery 1.
  • the series battery 1 adjacent to the battery 1 that has abnormally generated heat due to thermal runaway reduces the temperature of the battery 1 that has abnormally generated heat by conducting heat energy of the battery 1 that has abnormally generated heat.
  • the thermal energy conducted by the heat insulating layer provided near the partition between the batteries 1 is limited to prevent the induction of thermal runaway.
  • the battery pack in which the fuse link is connected to each battery can prevent the thermal runaway more effectively by fusing the fuse link with a short current.
  • the approach part 5C of the partition wall between the parallel batteries 1 is provided with a recess on the surface, and the heat insulating layer 10 is provided between the battery 1 surface.
  • the concave portion is on the inner surface of the battery housing portion 4, that is, the inner surface of the partition wall, and has an elongated shape extending in the longitudinal direction of the battery 1.
  • the recessed portion provided on the surface of the approaching portion of the partition wall between the parallel batteries 1 forms a heat insulating layer 10 of the heat insulating layer 10 between the surface of the battery 1 and the battery 1 that has abnormally generated heat due to the heat insulating effect of the heat insulating layer 10.
  • Limit heat conduction from The concave portion of the figure has a bottom surface as a curved surface along the outer peripheral surface of the battery 1, and a heat insulating layer 10 having a uniform thickness is provided along the arc of the outer peripheral surface of the battery 1.
  • the battery holder 2 in FIG. 2 is provided with a heat insulating layer 10 having a uniform lateral width on both sides at the thinnest part of the approach part 5C of the partition walls between the parallel batteries 1.
  • the heat energy of the battery 1 that has abnormally generated heat is thermally conducted to the adjacent battery 1 through the partition wall, but the heat energy that is thermally conducted becomes the largest in the thinnest portion where the heat is thinned.
  • the structure in which the heat insulating layer 10 is arranged in the thinnest part of the approaching part 5C of the partition walls between the parallel batteries 1 reduces the heat energy conducted from the thinnest part to the adjacent battery 1 and is connected in parallel. The induction of thermal runaway 1 can be effectively prevented.
  • the heat insulation layer 10 can improve a heat insulation characteristic by deepening a recessed part and enlarging an opposing area with the battery 1.
  • FIG. Furthermore, the heat insulation layer 10 can improve heat insulation properties as an elongated shape extending in the longitudinal direction of the battery 1.
  • the heat insulating layer 10 extending in the longitudinal direction of the battery 1 has, for example, a total length of 30% or more of the total length of the battery 1, preferably 50% or more, and more preferably 80% or more.
  • the heat insulation layer 10 can improve heat insulation characteristics as a structure in which an end portion thereof is opened at an end portion of the battery housing portion 4 to ventilate internal air to the outside of the battery holder 2.
  • the opening width of the heat insulating layer 10 is, for example, 1/20 or more of the outer periphery of the battery 1, preferably 1 / It is 10 or more, 1/4 or less, and optimally about 1/7.
  • the heat insulation layer 10 provided in the thinnest part of the approach part of the partition between parallel batteries is opened by making the both sides into the same horizontal width centering on the thinnest part.
  • the heat insulating layer 10 has a feature that the heat insulating property can be optimized with respect to the opening width. This is because the heat insulating layer 10 is disposed in the portion with the largest thermal energy of heat conduction.
  • the heat insulating layer 10 controls the heat conduction of the battery 1 that has abnormally heated to an ideal state by limiting heat conduction between the parallel batteries to a small extent.
  • the heat insulating layer 10 is provided in the partitioning portion 5C between the parallel batteries 1 and is not provided in the partition between the series batteries.
  • the battery holder 2 dissipates the thermal energy of the battery 1 that has abnormally generated heat due to thermal runaway to the batteries 1 connected in series via the partition walls between the series batteries, and the parallel battery 1 that is likely to induce thermal runaway is an approaching part. 5C prevents the induction of thermal runaway.
  • the heat insulating layer 10 provided on the partition wall can most effectively prevent induction of thermal runaway of both the battery 1 connected in parallel and the battery 1 connected in series in a state where any one of the batteries 1 is abnormally heated.
  • the length in the longitudinal direction, the opening width, and the depth of the recess are adjusted.
  • the heat insulating layer 10 is provided in the approach portion 5C of the partition between the parallel batteries 1 without providing the heat insulating layer 10 on the partition between the series batteries.
  • the heat insulating property of the heat insulating layer 10 provided in the approaching part 5C of the partition walls between the parallel batteries may be larger than the heat insulating property of the partition walls between the series batteries, that is, the approaching part of the partition walls between the parallel batteries
  • a heat insulating layer is provided on both partition walls between the series batteries, and the heat insulating property of the heat insulating layer provided in the approaching portion of the partition wall between the parallel batteries 1 is the heat insulating property of the heat insulating layer 10 provided on the partition wall between the series batteries. Can be larger.
  • the heat insulating property of the heat insulating layer 10 is increased by increasing the width of the heat insulating layer 10 in the longitudinal direction of the battery 1 to increase the facing area of the battery 1 and increasing the depth of the recess, that is, the thickness of the heat insulating layer 10. it can. Therefore, the battery holder 2 has a larger facing area of the heat insulating layer 10 provided in the approaching part 5C of the partition wall between the parallel batteries 1 than the battery 1 than the heat insulating layer 10 of the partition wall between the series batteries.
  • the thermal insulation layer 10 provided in the partition wall approaching part 5C between the battery cells is made thicker than the partition thermal insulation layer 10 between the series batteries, so that the thermal insulation of the partitioning part 5C between the parallel batteries 1 is made between the series batteries. It can be larger than the heat insulating property of the partition wall.
  • An exterior case 11 shown in FIG. 1 houses a battery holder 2 in which a plurality of cylindrical batteries are arranged at fixed positions.
  • the exterior case 11 shown in the figure is divided into a main body case 11A and a lid case 11B, and a storage portion for storing the battery holder 2 is formed inside.
  • a main body case 11A shown in FIG. 1 has a box shape having a depth that can accommodate almost the entire battery holder 2.
  • the outer case 11 is connected by ultrasonic welding or bonding the end faces of the peripheral walls provided in the main body case 11A and the lid case 11B.
  • the main body case and the lid case can be connected by screwing into a boss provided in the other case with a set screw penetrating the one case.
  • the exterior case can store a circuit board in addition to the battery holder 2.
  • An electronic component such as a protection circuit can be mounted on the circuit board.
  • the protection circuit may include a detection circuit that detects the voltage, remaining capacity, temperature, and the like of each cylindrical battery, and a switching element that is switched on and off by data of the battery 1 detected by the detection circuit.
  • the battery pack which accommodates a circuit board can also fix the output connector connected to the circuit board to an exterior case.
  • the output connector has an output terminal and a signal terminal, is charged / discharged through the output terminal, and can communicate with a device set through the signal terminal.
  • the battery pack may have a structure in which connection terminals made up of output terminals and signal terminals are fixed to a circuit board without providing an output connector, and these connection terminals are exposed from the bottom case to be externally connected. it can.
  • the present invention can be effectively used for a battery pack in which a large number of batteries 1 are housed in a battery holder 2 and fuse links are connected to the batteries to improve safety.

Landscapes

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

Abstract

La présente invention empêche une liaison fusible mince (3C) de se casser en raison d'un choc ou de vibrations, et améliore la résistance aux chocs d'un bloc-batterie. Chaque barre omnibus à plaque métallique (3) connecte électriquement une pluralité de batteries disposées à des positions fixes dans un support de batteries (2), et comprend : des bornes fixes (3A) connectées à des bornes d'électrode des batteries ; une partie de base (3B) connectant les bornes fixes (3A) ; et des liaisons fusibles (3C) couplant respectivement les bornes fixes (3A) et la partie de base (3B). Dans la partie de base (3B) de la barre omnibus (3), une première partie de montage (3I) est fournie sur une partie de couplage de liaison fusible (3Ba) qui est couplée à la partie de col de la liaison fusible (3C). Une seconde partie de montage (2C) couplée à la première partie de montage (3I) est fournie sur le support de batteries (2). La seconde partie de montage (2C) est couplée à la première partie de montage (3I), et la partie de couplage de liaison fusible (3Ba) est couplée au support de batteries (2) de façon à ne pas se déplacer par rapport à celui-ci.
PCT/JP2018/002987 2017-03-31 2018-01-30 Bloc-batterie Ceased WO2018179794A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017071722A JP2020095778A (ja) 2017-03-31 2017-03-31 電池パック
JP2017-071722 2017-03-31

Publications (1)

Publication Number Publication Date
WO2018179794A1 true WO2018179794A1 (fr) 2018-10-04

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PCT/JP2018/002987 Ceased WO2018179794A1 (fr) 2017-03-31 2018-01-30 Bloc-batterie

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JP (1) JP2020095778A (fr)
WO (1) WO2018179794A1 (fr)

Cited By (4)

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JP2020136170A (ja) * 2019-02-22 2020-08-31 トヨタ自動車株式会社 組電池
JP2023500527A (ja) * 2020-04-09 2023-01-06 エルジー エナジー ソリューション リミテッド モジュールバスバーを含むバッテリーモジュール、それを含むバッテリーパック及び電子デバイス
WO2025047343A1 (fr) * 2023-08-30 2025-03-06 パナソニックＩｐマネジメント株式会社 Dispositif d'alimentation électrique
WO2025126915A1 (fr) * 2023-12-13 2025-06-19 サンコール株式会社 Barre omnibus, ensemble barre omnibus et module de batterie

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US20230261278A1 (en) * 2021-01-11 2023-08-17 LG Energy Solution, Ltd., Battery pack and vehicle comprising same
WO2022191683A1 (fr) * 2021-03-12 2022-09-15 주식회사 엘지에너지솔루션 Ensemble barre omnibus, bloc-batterie comprenant un ensemble barre omnibus, et véhicule comprenant un bloc-batterie
US12463283B2 (en) 2021-10-12 2025-11-04 Lg Energy Solution, Ltd. Battery pack and vehicle including the same
WO2025088940A1 (fr) * 2023-10-25 2025-05-01 パナソニックＩｐマネジメント株式会社 Dispositif d'alimentation électrique

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JP2015099726A (ja) * 2013-11-20 2015-05-28 トヨタ自動車株式会社 蓄電モジュール
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JP2020136170A (ja) * 2019-02-22 2020-08-31 トヨタ自動車株式会社 組電池
JP7116893B2 (ja) 2019-02-22 2022-08-12 トヨタ自動車株式会社 組電池
JP2023500527A (ja) * 2020-04-09 2023-01-06 エルジー エナジー ソリューション リミテッド モジュールバスバーを含むバッテリーモジュール、それを含むバッテリーパック及び電子デバイス
JP7507858B2 (ja) 2020-04-09 2024-06-28 エルジー エナジー ソリューション リミテッド モジュールバスバーを含むバッテリーモジュール、それを含むバッテリーパック及び電子デバイス
US12362435B2 (en) 2020-04-09 2025-07-15 Lg Energy Solution, Ltd. Battery module comprising module bus bar, battery pack comprising same, and electronic device
WO2025047343A1 (fr) * 2023-08-30 2025-03-06 パナソニックＩｐマネジメント株式会社 Dispositif d'alimentation électrique
WO2025126915A1 (fr) * 2023-12-13 2025-06-19 サンコール株式会社 Barre omnibus, ensemble barre omnibus et module de batterie

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