WO2018221004A1 - 電池パック - Google Patents
電池パック Download PDFInfo
- Publication number
- WO2018221004A1 WO2018221004A1 PCT/JP2018/014675 JP2018014675W WO2018221004A1 WO 2018221004 A1 WO2018221004 A1 WO 2018221004A1 JP 2018014675 W JP2018014675 W JP 2018014675W WO 2018221004 A1 WO2018221004 A1 WO 2018221004A1
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- WO
- WIPO (PCT)
- Prior art keywords
- battery
- fuse link
- bus bar
- battery pack
- fixed
- Prior art date
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/574—Devices or arrangements for the interruption of current
- H01M50/581—Devices or arrangements for the interruption of current in response to temperature
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/655—Solid structures for heat exchange or heat conduction
- H01M10/6553—Terminals or leads
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/505—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing comprising a single busbar
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/509—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the type of connection, e.g. mixed connections
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/509—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the type of connection, e.g. mixed connections
- H01M50/51—Connection only in series
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/509—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the type of connection, e.g. mixed connections
- H01M50/512—Connection only in parallel
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/514—Methods for interconnecting adjacent batteries or cells
- H01M50/516—Methods for interconnecting adjacent batteries or cells by welding, soldering or brazing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/521—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the material
- H01M50/522—Inorganic material
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2200/00—Safety devices for primary or secondary batteries
- H01M2200/10—Temperature sensitive devices
- H01M2200/103—Fuse
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/218—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material
- H01M50/22—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material of the casings or racks
- H01M50/227—Organic material
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/547—Terminals characterised by the disposition of the terminals on the cells
- H01M50/548—Terminals characterised by the disposition of the terminals on the cells on opposite sides of the cell
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- 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 fuse link is designed to be blown when the battery current, that is, the current flowing through the fixed terminal becomes larger than the set current.
- the fuse link made of a metal plate having a high conductivity is formed to be elongated to adjust the set current.
- the electrical resistance of a metal wire is proportional to the length and inversely proportional to the cross-sectional area. Therefore, the fuse link formed by cutting a metal plate has a resistance value that is reduced by reducing the width and increasing the length. Can be big. For this reason, the fuse link is elongated to increase the electric resistance so as to generate heat and blow 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 fuse link is designed to be surely blown in a state where the set current is energized in order to prevent an excessive current from flowing through the battery when the battery is abnormal. Furthermore, since it is desirable to instantaneously shut down the circuit when the battery is abnormal, it is important that the fuse link is blown out in as short a time as possible to reliably cut off the overcurrent.
- the bus bar is made of a metal plate having high conductivity, that is, electricity easily flows, the fuse link has a narrow width and a long length to increase the electric resistance. However, a narrow and long metal plate has a low physical strength and is easily broken by an impact such as vibration or dropping.
- the fuse link provided in the bus bar needs to be adjusted in electrical resistance so that the fuse link is surely blown in a short time when a set current is applied.
- the metal plate The structure which narrows the width
- the bus bar built in the battery pack and connected to the battery is required to have a structure that increases the strength of the fuse link so that the fuse link is not broken by an impact such as vibration or dropping.
- the fuse link can increase the strength and improve the impact resistance by increasing the width of the metal plate or shortening the length.
- the present invention was developed for the purpose of solving the above problems.
- One of the objects of the present invention is to effectively prevent the fuse link from being broken by vibration and shock, and in the state where an overcurrent flows through the fuse link, the fuse link can be surely blown in a short time to protect the battery.
- the object is to provide a battery pack that can.
- a battery pack according to an aspect of the present invention is formed by fixing a plurality of batteries 1 that can be charged / discharged, a battery holder 2 in which each battery 1 is disposed at a fixed position, and electrode terminals 1x and 1y of the battery 1 to each other.
- the bus bar 3 includes a plurality of fixed terminals 3A connected to the electrode terminals 1x and 1y of the battery 1, a base portion 3B connecting the plurality of batteries 1 in series and / or in parallel via the plurality of fixed terminals 3A, Is connected to the fixed terminal 3A, and the fuse link 3C is connected to the base portion 3B.
- the battery pack includes a heat insulating member 8 that covers the surfaces of the fuse link 3C and the fixed terminal 3A connected to the fuse link 3C in a close contact state.
- the above battery pack can protect the battery by fusing the fuse link reliably in a short time in a state where overcurrent flows through the fuse link while effectively preventing the fuse link from being broken by vibration and impact. There is. This is because the above battery pack covers the surface of the fuse link provided on the bus bar and the fixed terminal connected to the fuse link in a tight contact state with a heat insulating member. In this battery pack, the surface of the fuse link and the fixed terminal are covered with a heat insulating member so that both the fuse link and the fixed terminal are thermally insulated from the outside, thereby promoting the concentration of heat on the fuse link in the event of an abnormality. And can be melted quickly.
- the heat energy generated inside the battery is suppressed from being released to the outside, and the electrode terminal is efficiently connected to the fuse link.
- a fuse link where the fuse link is heated by heat conduction and the surface is covered with a heat insulating member, in addition to being efficiently heated by heat conduction from the fixed terminal, it is generated by an excessive current flowing in the fuse link It is possible to quickly increase the temperature of the fuse link by suppressing the release of Joule heat to the outside.
- this battery pack heats the fuse link by efficiently conducting heat generated in the battery from the fixed terminal to the fuse link in the event of a battery abnormality, and Joule heat due to overcurrent flowing in the fuse link is exposed to the outside. Due to the synergistic effect that the fuse link can be efficiently heated while being suppressed from being released, the fuse link temperature can be raised to the melting temperature in a short time to melt and the battery can be reliably protected.
- the battery pack described above can efficiently raise the temperature of the fuse link to the melting temperature in a short time by covering the surface of the fuse link and the fixed terminal with a heat insulating member so that the cross-sectional area of the fuse link can be reduced. For example, even if the width of the fuse link made of a metal plate is widened and the fuse link is designed to be short, the fuse link can be reliably heated to the melting temperature and blown in the event of a battery failure. . In this way, a battery pack that can widen or shorten the length of the fuse link can increase the strength of the fuse link and effectively prevent the fuse link from being broken by an impact such as vibration or dropping. it can.
- the battery pack described above covers the surface of the fuse link and the fixed terminal in a close contact state with a heat insulating member, the fuse link and the fixed terminal are relative to the base portion of the bus bar when subjected to vibration or impact. Can be effectively prevented from moving to. This is because the movement of the fuse link and the fixed terminal is suppressed by the heat insulating member that covers the surfaces of the fuse link and the fixed terminal.
- the battery pack that can prevent the fuse link and the fixed terminal from moving relative to the base portion can improve impact resistance and can be safely used without losing the fuse function in various applications. Realize features.
- the heat insulating member 8 can be formed of potting resin.
- the heat insulating member is made of potting resin, and therefore, by filling the surface of the fuse link and the fixed terminal with potting resin, the heat insulating member that covers these surfaces in a close contact state can be easily and easily formed. be able to. Further, the manufacturing cost can be reduced by minimizing the amount of potting resin covering the surfaces of the fuse link and the fixed terminal.
- the heat insulating member 8 includes a resin-molded coating material 8A, and the coating material 8A is closely attached to the surface of the fuse link 3C and the fixed terminal 3A connected to the fuse link 3C. Can be fixed in the state.
- the resin-molded covering material is fixed to the surface of the bus bar and the fuse link and the fixed terminal are covered in close contact with each other. Therefore, the surface of the bus bar is coated using a covering material manufactured in a separate process in advance. Can be coated and manufacturing time can be shortened. In addition, since this structure can always cover the fuse link and the fixed terminal in the same state by manufacturing a covering material having the same shape and thickness, the set current flows with the time required for fusing the fuse link constant. The fuse link can be melted stably in this state.
- the bus bar 3 includes a plurality of fuse links 3C, and the heat insulating member 8 that covers the surfaces of all the fuse links 3C provided on the bus bar 3 in a close contact state is integrated. Can be molded.
- a plurality of fuse links are provided on the bus bar, and a heat insulating member that covers the surfaces of all the fuse links in a close contact state is integrally formed. Therefore, the covering state of each fuse link by the heat insulating member The molding time of the heat insulating member can be shortened while equalizing.
- the structure in which the surfaces of all the fuse links provided on the bus bar are evenly covered with the heat insulating member can stabilize the heating state of the fuse links and reliably blow the fuse links in a state where a set current flows.
- the heat insulating member 8 can be formed on the entire surface of the bus bar 3.
- the above battery pack can cover the plurality of fuse links and fixed terminals provided on the bus bar with the heat insulating member while reducing the manufacturing time by providing the heat insulating member on the entire surface of the bus bar.
- the heat insulating member is a potting resin
- the potting resin is provided on the entire surface of the bus bar, so that the thickness of the heat insulating member can be made uniform while covering the surface of each fuse link and the fixed terminal without any spots.
- the heat insulating member is a covering material
- the entire surface of the bus bar can be arranged in a fixed position while being easily and easily covered.
- the battery holder 2 has a plurality of batteries 1 arranged in parallel with each other, and electrode terminals 1x and 1y provided at both ends of each battery 1 are arranged on the same surface.
- the electrode terminals 1x and 1y of the battery 1 can be connected by the bus bar 3 on both surfaces of the battery holder 2.
- the battery holder 2 can form the positioning recessed part 2D which arrange
- the bus bar is disposed in the positioning recess formed on both surfaces of the battery holder, and the heat insulating member is disposed in the positioning recess. Therefore, the heat insulating member is placed on the surface of the bus bar while the inner wall of the positioning recess is used as the boundary wall. It can be placed accurately.
- the inner wall of the positioning recess formed in the battery holder is also used as the outer peripheral wall of the region filled with the potting resin so that the potting resin is outside the positioning recess. It can be filled efficiently while preventing it from sticking out.
- the inner wall of the positioning recess formed in the battery holder is also used as the positioning wall for positioning the outer peripheral edge of the covering material, so that the covering material can be easily and accurately positioned. Can be placed.
- the battery pack according to another aspect of the present invention includes a fuse link connecting portion 3Ba in which the base portion 2B connects the base portion of the fuse link 3C, and the first fitting is fitted to the fuse link connecting portion 3Ba.
- a joint portion 3I is provided, and the battery holder 2 is connected to the first fitting portion 3I and has a second fitting portion 2C connected to the fuse link connecting portion 3Ba.
- the second fitting portion 2C is connected, the fuse link connecting portion 3Ba is connected to the battery holder 2, and the connecting portion between the first fitting portion 3I and the second fitting portion 2C is connected by the heat insulating member 8. Can be fixed.
- the battery pack described above is provided with a first fitting portion at the fuse link connecting portion connecting the base portions of the fuse links, and the second fitting provided on the battery holder is provided at the first fitting portion.
- the connecting portion is connected, the fuse link connecting portion is connected to the battery holder so as not to move to the battery holder, and the connecting portion between the first fitting portion and the second fitting portion is a heat insulating member. Since it fixes, both a battery holder and a fuse link connection part are fixed to a fixed position with a heat insulation member, and the relative movement of a fuse link and a battery can be prevented reliably. For this reason, even if the above battery pack receives impacts, such as dropping, the relative movement of a fuse link and a battery can be prevented, and damage to a fuse link can be prevented.
- the base portion 3B of the bus bar 3 includes a positioning hole 3K between the adjacent fixed terminals 3A, and is guided by the positioning hole 3K and coupled to the bus bar 3.
- the positioning rib 2F is provided on the battery holder 2, the positioning rib 2F is connected to the positioning hole 3K, the bus bar 3 is connected to the battery holder 2, and the connecting portion between the positioning hole 3K and the positioning rib 2F is connected to the heat insulating member 8 It can be fixed with.
- the positioning rib provided in the battery holder is connected to the positioning hole provided in the base portion of the bus bar to connect the bus bar to the battery holder, and the connecting portion between the positioning hole and the positioning rib is formed by a heat insulating member. Since it fixes, a bus-bar can be stably fixed to the fixed position of a battery holder with a heat insulation member.
- FIG. 3 is a horizontal sectional view of a battery pack according to an embodiment of the present invention, corresponding to a cross section taken along line II in FIG. 2.
- FIG. 2 is a sectional view taken along line II-II of the battery pack shown in FIG.
- FIG. 2 is a partially enlarged exploded perspective view of the battery pack shown in FIG. 1.
- It is a front view which shows the internal structure of the battery pack shown in FIG. 1, Comprising: It is a front view which shows the state which fixed the bus bar to the battery holder.
- 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 to 6 show a battery pack according to an embodiment of the present invention.
- 1 is a horizontal sectional view of the battery pack
- FIG. 2 is a vertical longitudinal sectional view of the battery pack
- FIG. 3 is an exploded perspective view of the battery pack
- FIGS. 4 to 6 are front views showing the internal structure of the battery pack, A rear view and an enlarged perspective view are respectively shown.
- the battery pack shown in these drawings includes a plurality of batteries 1 that can be charged / discharged, a battery holder 2 that places the plurality of batteries 1 at fixed positions, and a metal bar bus bar 3 that is fixed to the electrode terminals 1x and 1y of the battery 1. And.
- the battery holder 2 has a plurality of batteries 1 arranged in parallel to each other, and both ends thereof are arranged on the same plane and arranged at fixed positions.
- the bus bar 3 connects a plurality of batteries 1 arranged in a fixed position by the battery holder 2 in series and in parallel.
- the bus bar 3 includes a plurality of fixed terminals 3A connected to the electrode terminals of the battery 1, a base portion 3B for connecting the plurality of batteries 1 in series and / or in parallel via the plurality of fixed terminals 3A, and a fixed terminal at the tip.
- the fuse link 3C is connected to 3A and the base portion is connected to the base portion 3B.
- the battery pack includes a heat insulating member 8 that covers the surface of the fuse link 3C and the fixed terminal 3A connected to the fuse link 3C in a close contact state. 2, 4, and 5 show a state in which the heat insulating member 8 is omitted for easy understanding of the configuration of the battery pack.
- the battery pack is assembled by housing a battery holder 2 in which a plurality of batteries 1 are arranged at fixed positions in an outer case 11.
- 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 1x and 1y as 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 1x, 1y on both end faces are arranged in parallel to the battery holder 2, and the electrode terminals 1x, 1y on both ends are exposed on both faces of the battery holder 2, and the bus bar 3 Connected in series and parallel.
- 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 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 4 and the electrode terminals 1x and 1y provided on both end faces are arranged on the same plane and 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 FIG. 2 and FIG. 3 has a shape in which a plurality of battery storage portions 4 are arranged in multiple rows and stages 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 2 can also arrange
- the battery holder 2 in FIGS. 2 and 3 has 112 batteries 1 arranged 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 shown in FIG. 1 and FIG. 3 is composed of a pair of holder units 2A divided in the middle.
- the holder unit 2A has electrode windows 7 that expose the electrode terminals 1x and 1y 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 is exposed from the electrode window 7.
- the bus bar 3 can be connected to the electrode terminals 1x and 1y of the battery 1.
- the electrode window 7 that exposes one electrode terminal 1 y of the battery 1 is rectangular, and the electrode window 7 that exposes the other electrode terminal 1 x 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 FIGS. 3 to 6 is provided with a positioning recess 2D for arranging the bus bar 3 at a fixed position on both sides.
- the illustrated battery holder 2 is provided with a plurality of positioning recesses 2D so that the plurality of bus bars 3 can be arranged at fixed positions.
- the positioning recess 2D has an inner shape along the outer periphery of the bus bar 3 so that the bus bar 3 can be inserted while being positioned.
- the battery holder 2 shown in the drawing is provided with partition walls 2E along the outer periphery of the bus bar 3 on both sides thereof, and a region inside the partition wall 2E is used as a positioning recess 2D.
- the battery holder 2 is formed so that the bottom surface of the positioning recess 2D has a recess shape that is one step lower than the end surface of the battery holder 2, more precisely, the front end surface of the partition wall 2E.
- a plurality of electrode windows 7 are opened on the bottom surface of the positioning recess 2D, and the plurality of bus bars 3 are arranged on the same plane on the bottom surface.
- the positioning recesses 2 ⁇ / b> D formed on both surfaces of the battery holder 2 are disposed with the heat insulating member 8 after the bus bar 3 is disposed and connected to the battery 1.
- 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.
- 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 of the battery pack shown in FIGS. 1 to 5 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 1x and 1y of the battery 1, and a base portion 3B connecting the plurality of batteries 1 in series and in parallel via the fixed terminals 3A.
- a fuse link 3C having a tip connected to the fixed terminal 3A and a base connected to the base 3B.
- the bus bar 3 is manufactured by cutting one metal plate with a die and bending it.
- 4 is a front view of the bus bar 3 arranged on the front side surface of the battery holder 2, and FIG.
- the battery holder 2 has seven bus bars 3 arranged on the front side and eight bus bars 3 arranged on the back side, and the batteries 1 are connected in parallel with the bus bar 3 in series.
- the fixed terminal 3A is connected to the electrode terminals 1x and 1y of the battery 1 by spot welding as shown in FIGS.
- the fixed terminal 3A is provided with a weld 3E at the tip of the step 3D.
- the fixed terminal 3A provides a gap 3F between the fixed terminal 3A and the welded part 3E from the base part 3B.
- the welding portion 3E is disposed inside the electrode window 7 provided in the battery holder 2 and is connected to the electrode terminals 1x and 1y 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 terminals 1x, 1y, and connects the welded portion 3E to the electrode terminals 1x, 1y inside the electrode window 7 to connect them.
- the welded portion 3E that protrudes toward the electrode terminals 1x and 1y via the stepped portion 3D is inserted into the electrode window 7 of the battery holder 2 and is connected to the electrode terminals 1x and 1y 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 terminals 1x and 1y on both sides of the slit 3H, and the convex portions 3G are connected to the electrode terminals 1x and 1y by spot welding.
- the slit 3H reduces the reactive current and efficiently welds the convex portion 3G to the electrode terminals 1x and 1y.
- 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 step portion 3D and the base portion 3B.
- 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 1y of the battery 1
- the first fixed terminal 3Aa is connected to the negative side of the battery 1 and the second fixed terminal 3Ab is connected to the battery 1.
- 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 in a state where the weld 3E is fixed to the electrode terminals 1x and 1y.
- the welded portion 3E is fixed to the electrode terminals 1x and 1y, and the fuse link 3C can be brought into contact with or close to the support surface 2B.
- the battery holder 2 in FIG. 3 has a rectangular electrode window 7 in which the fixed terminal 3A to which the fuse link 3C is connected is disposed, and a support surface 2B of the fuse link 3C is 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 it, and fixing the fixed terminals 3A.
- a base portion 3B is provided between the outer side and the adjacent fixed terminal 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 via the battery holder 2 so as not to move relative to the battery 1. 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 first fitting portion 3I is used as a fitting hole
- the second fitting portion 2C is 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 arranged in the vicinity of the base portion of the fuse link 3C.
- the distance (k) between the first fitting portion 3I and the base portion of the fuse link 3C is set to be not more than five times the fuse link 3C lateral width (W), so that the deformation of the fuse link 3C can be 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 does not necessarily need to be provided with the first fitting portion in every fuse link connecting portion. 7 to 9, the first fitting portion 3I is provided only in the fuse link connecting portion 3Ba between the adjacent fixed terminals 3A, and the fuse link connecting portion 3Ba disposed on the outer peripheral portion has the first fitting. No fitting part is provided.
- the outer peripheral fuse link connecting portion 3Ba is provided with a through hole 3J in a nearby base portion 3B, the connecting rib of the battery holder 2 is inserted into the through hole 3J, and relative movement is caused between the through hole 3J and the connecting rib. This prevents the fuse link 3C from being deformed.
- 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 in FIGS.
- a positioning rib 2F 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 positioning ribs 2F also have an effect of preventing relative movement between the bus bar 3 and the battery holder 2 while the bus bar 3 is disposed 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 FIGS. 4 and 5 in parallel, and the horizontally adjacent batteries 1 separated in the horizontal direction in series. Connected to.
- the bus bar 3 arranged on the back side surface of the battery holder 2 includes the bus bar 3 arranged on both sides in FIG. 5 and connecting the batteries 1 arranged in a row in the vertical direction in parallel with the two rows of batteries 1 in parallel. Bus bar 3 connected in series.
- the bus bar 3 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 adjacent rows in series. Connected.
- FIG. 10 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 terminals 1x and 1y of the battery 1.
- the batteries 1 shown in FIGS. 4 and 5 are arranged in multiple rows by connecting the batteries 1 arranged in multiple stages (arranged vertically in the figure) via the bus bar 3 in parallel with each other.
- the batteries 1 (disposed on the left and right in the figure) are connected in series.
- the bus bar can connect batteries arranged in multiple stages in series and connect batteries arranged in multiple rows in parallel.
- the bus bars 3 are arranged on both surfaces of the battery holder 2 and connect the batteries 1 in series and in parallel.
- the heat insulating member 8 is disposed on the surface of the bus bar 3 connected to the electrode terminals 1x and 1y of the battery 1, and covers at least the fuse link 3C and the surface of the fixed terminal 3A connected to the fuse link 3C in a close contact state. is doing.
- the heat insulating member 8 is a member having insulating properties, and is preferably made of resin. The heat insulating member 8 made of resin is in close contact with the surfaces of the fuse link 3C and the fixed terminal 3A to insulate the fuse link 3C and the fixed terminal 3A from the outside.
- the fuse link 3C and the fixed terminal 3A that are thermally insulated by the heat insulating member 8 effectively conduct the heat of the battery 1, and when the overcurrent is passed through the fuse link 3C, the heat of the fuse link 3C is externally transmitted.
- the fuse link 3C is blown by reliably raising the temperature without radiating heat.
- the heat insulating member 8 is preferably made of potting resin.
- the potting resin is pasty or liquid in an uncured state, and is filled in an uncured state on the surface of the fuse link 3C formed on the bus bar 3 and the fixed terminal 3A connected to the fuse link 3C.
- the potting resin filled on the surfaces of the fuse link 3C and the fixed terminal 3A is cured with time, and the heat insulating member 8 fixed in close contact with the surfaces of the fuse link 3C and the fixed terminal 3A is formed.
- a resin excellent in adhesiveness such as urethane resin is used.
- a two-component mixed urethane resin can be used. This urethane resin can be polymerized by stirring and mixing a liquid main agent and a curing agent at room temperature, and can be cured from a paste-like or liquid uncured state.
- an epoxy resin, an unsaturated polyester resin, or the like can be used as the two-component mixed resin.
- a resin (thermosetting resin, photocurable resin) that is pasty or liquid at normal temperature and is cured with time or cured by heat or light can be used.
- These potting resins are filled in the surface of the fuse link 3C and the fixed terminal 3A in an uncured state, and in a state of being hardened over time, the potting resin is in a state of being in close contact with the surface of the fuse link 3C and the fixed terminal 3A. It is fixed to achieve excellent heat insulation properties.
- the heat insulating member 8 is formed so as to cover the surfaces of the plurality of fuse links 3C provided on the bus bar 3 and the fixed terminals 3A connected to the fuse links 3C.
- the heat insulating member 8 shown in FIG. 6 is formed so as to cover the entire surface of the bus bar 3.
- the heat insulating member 8 that covers the entire surface of the bus bar 3 is filled with the positioning recess 2D with a paste-like or liquid potting resin in an uncured state, in other words, the positioning recess 2D is formed into a molding container for the heat insulating member 8.
- Insulating member 8 can be formed by injecting uncured potting resin and curing the filled potting resin.
- the battery holder 2 in which the bus bar 3 is fixed to the bottom surface of the positioning recess 2D is placed with the opening of the positioning recess 2D facing upward, and an uncured potting resin is injected into the positioning recess 2D.
- the uncured potting resin filled in the positioning recess 2D spreads along the surface of the bus bar 3 and covers the entire surface of the bus bar 3.
- a heat insulating member 8 that covers the entire surface of the bus bar 3 by curing the potting resin filled in the positioning recess 2D is provided.
- the structure in which the heat insulating member 8 is formed on the entire surface of the bus bar 3 is characterized in that the plurality of fuse links 3C and the fixed terminals 3A provided on the bus bar 3 can be covered easily and easily. Furthermore, the method of forming the heat insulating member 8 by filling the positioning recess 2D with the potting resin as described above can form the heat insulating member 8 having a predetermined thickness on the surface of the bus bar 3. As described above, the heat insulating member 8 that can make the thickness of the portions covering the plurality of fuse links 3C and the fixed terminal 3A uniform makes the time required for fusing the fuse links 3C constant and allows the fuse links to flow in a state where a set current flows. 3C can be blown reliably.
- the potting resin filled in a state of covering the surfaces of the fuse link 3C and the fixed terminal 3A is a recess formed between the electrode window 7 and the electrode terminals 1x and 1y, the fixed terminal 3A, the fuse link 3C and the base. It also enters the gap 3F formed between the portion 3B and fills the surface of the fuse link 3C and the fixed terminal 3A and the vicinity thereof with no gap. For this reason, the surface of the electrode terminals 1x and 1y of the battery 1 or the peripheral area of the fuse link 3C and the fixed terminal 3A can be covered with the heat insulating member 8 to be in a heat insulating state. For this reason, when the battery is abnormal, the heat energy generated inside the battery can be conducted from the fixed terminal 3A to the fuse link 3C without being radiated to the outside, and the fuse link 3C can be effectively heated.
- the potting resin filled in the positioning recess 2D is fixed in a state where the connecting portion between the first fitting portion 3I and the second fitting portion 2C is embedded in the heat insulating member 8. For this reason, both the battery holder 2 and the fuse link connecting portion 3Ba are fixed in place by the heat insulating member 8, and the relative movement between the fuse link 3C and the battery 1 can be reliably prevented. Furthermore, the potting resin filled in the positioning recess 2D is fixed in a state where the connecting portion between the positioning hole 3K and the positioning rib 2F is embedded in the heat insulating member 8. For this reason, the bus bar 3 can be stably fixed to the fixed position of the battery holder 2.
- the above heat insulating member 8 covers the entire surface of the bus bar 3, but the heat insulating member does not necessarily have to cover the entire surface of the bus bar.
- the heat insulating member 8 can cover at least the surface of the fuse link 3C provided on the bus bar 3 and the fixed terminal 3A connected to the fuse link 3C. Therefore, although not shown, the heat insulating member can be formed so as to individually cover the surfaces of the plurality of fuse links and the fixed terminals connected to the fuse links.
- the heat insulating member can be formed by supplying potting resin to each of the fuse link and the fixed terminal on which the heat insulating member is formed. For this reason, the amount of potting resin to be used can be minimized and the amount of potting resin to be used can be reduced.
- the heat insulating member can be integrally formed so as to cover the surfaces of the plurality of fuse links provided on the bus bar.
- the heat insulating member can cover the surfaces of all the fuse links provided on the bus bar by continuously supplying the potting resin along the surface of the bus bar, for example.
- the heat insulation member that covers the surfaces of the plurality of fuse links provided on the bus bar is integrally formed, so that the insulation state of each fuse link by the heat insulation member can be made uniform while reducing the manufacturing time of the heat insulation member. it can.
- the heat insulation member 8 can be provided with a resin-molded coating material 8A as shown in FIG.
- the covering material 8A is formed by molding a resin in a plate shape or a sheet shape, and is fixed to the surface of the bus bar 3, particularly the surface of the fuse link 3C and the fixed terminal 3A, through an adhesive 8B, for example.
- the heat insulating member 8 shown in FIG. 11 fills the heat insulating member 8 made of the covering material 8A and the adhesive 8B with the fuse link by filling the adhesive 8B into the uneven portions formed around the fuse link 3C and the fixed terminal 3A. It is fixed in close contact with the surface of the fixed terminal. As shown in FIG.
- the plate-like or sheet-like covering material 8 ⁇ / b> A is inserted into the positioning recess 2 ⁇ / b> D by being shaped along the outer shape of the bus bar 3, and is arranged at a fixed position along the surface of the bus bar 3. Is done.
- the covering material 8A shown in FIG. 11 has a connecting hole 8F opened at a position facing the positioning rib 2F.
- the covering material 8 ⁇ / b> A can be provided with a soft layer 8 ⁇ / b> C on the surface facing the bus bar 3 on the surface of the resin-molded covering material 8 ⁇ / b> A.
- the soft layer 8C shown in FIG. 12 has a convex portion 8D formed at a position facing the concave and convex portions formed on the periphery of the fuse link 3C and the fixed terminal 3A.
- the covering material 8A presses the soft layer 8C against the surfaces of the fuse link 3C and the fixed terminal 3A, thereby covering the surfaces of the fuse link 3C and the fixed terminal 3A in a close contact state and more effectively heat-insulating.
- the covering material 8A also has a feature that the impact resistance of the fuse link 3C can be improved by covering the fuse link 3C with the soft layer 8C and using the soft layer 8C as a buffer material.
- the covering material 8A can be easily bonded to the surface of the bus bar 3 by using the soft layer 8C as an adhesive layer.
- An outer case 11 shown in FIGS. 1 to 3 accommodates 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 first case 11A and a second case 11B, and a storage portion for storing the battery holder 2 is formed inside.
- the first case 11 ⁇ / b> A and the second case 11 ⁇ / b> B shown in FIG. 3 have a box shape having a depth that can accommodate almost half of the battery holder 2.
- the outer case 11 is connected by ultrasonic welding or bonding the end surfaces of the peripheral walls provided in the first case 11A and the second case 11B.
- the first case and the second case can be connected by screwing into a boss provided in the other case with a set screw penetrating the one case.
- the outer case 11 houses the circuit board 10 in addition to the battery holder 2.
- the circuit board 10 can be mounted with an electronic component such as a protection circuit.
- the protection circuit 10 includes a detection circuit that detects the voltage, remaining capacity, temperature, and the like of each battery 1 and a switching element that is switched on and off by data of the battery 1 detected by the detection circuit. Can do.
- the battery pack which accommodates a circuit board can also fix the output connector connected to the circuit board to the exterior case 11.
- 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 fuse link 3C connected to the battery 1 is quickly blown to interrupt the overcurrent. It can. That is, by covering the surfaces of the fuse link 3C and the fixed terminal 3A with the heat insulating member 8 in an intimate contact state, the heat dissipation from the surface of the fuse link 3C and the fixed terminal 3A to the outside is effectively suppressed, and the fuse in an abnormal state This is because the concentration of heat on the link 3A is promoted. As shown in FIG.
- a battery pack in which a plurality of batteries 1 are arranged in multiple stages and connected in series and in parallel with a bus bar 3 is a battery pack when an abnormality occurs due to an internal short circuit or the like. Abnormal heat is generated internally, and an overcurrent is passed through the battery 1.
- FIG. 10 it has shown that the battery 1 of the upper center is in an abnormal state.
- the heat insulating member 8 covering the fixed terminal 3A suppresses heat radiation from the surface of the fixed terminal 3A while the temperature inside the battery rises. For this reason, as shown by the arrow B in FIG. 10, the heat energy inside the battery is efficiently conducted from the fixed terminal 3A to the fuse link 3C to effectively heat the fuse link 3C. Further, in the battery pack, when heat is generated by Joule heat due to an overcurrent indicated by an arrow A flowing through the fuse link 3C when the battery 1 is abnormal, the heat insulating member 8 covering the fuse link 3C dissipates heat from the surface of the fuse link 3C. Suppress.
- the temperature of the fuse link 3C heated by Joule heat is quickly raised to the melting temperature, and the fuse link 3C is melted.
- the heat insulating member 8 covers the surfaces of the fuse link 3C and the fixed terminal 3A in a close contact state, so that heat can be effectively stored in the fixed terminal 3A and the fuse link 3C.
- the fuse link 3C can be heated.
- the battery pack of the embodiment of the present invention in which the surface of the fuse link 3C of the bus bar 3 and the fixed terminal 3A connected to the fuse link 3C is covered with the heat insulating member 8, and the conventional battery pack Then, using a battery pack in which the surfaces of the fuse link and the fixed terminal are not covered with a heat insulating member, an experiment was conducted to measure the time taken for the fuse link to blow when an excessive current was applied.
- the width of the fuse link of the bus bar made of a metal plate connected to the electrode terminal of the battery is 1.5 mm, and a current of 160 A is applied to each. The experiment was conducted several times to measure the time taken until the fuse link was blown.
- the fuse link could be blown in 0.2 seconds.
- the surface of the fuse link and the fixed terminal is covered with the heat insulating member, thereby promoting the concentration of heat on the fuse link and reducing the time required for fusing to 1/3 or less. did it.
- the structure that can shorten the time required for fusing the fuse link is such that when the battery is abnormal, the fuse link is blown in a short time so that an excessive current flows to the battery in an abnormal state. It can be stopped immediately to protect safety.
- the time required for fusing can be shortened to 1/3 or less as compared with the conventional fuse link by covering the surface of the bus bar fuse link and the fixed terminal with a heat insulating member.
- the battery pack of the present invention by providing a heat insulating member on the surface of the fuse link and the fixed terminal, the width of the fuse link provided on the bus bar is widened and the length is shortened as compared with the conventional battery pack.
- a feature that can shorten the time required for fusing can be realized.
- widening the width of the fuse link and shortening the length increases the strength of the fuse link and can effectively prevent the fuse link from being damaged by vibration or impact.
- the fixed terminal 3A and the base portion 3B are connected via an elongated crank-shaped fuse link 3C.
- the fuse link 3C having this shape can increase the electrical resistance of the fuse link 3C by increasing the total length of the fuse link 3C while reducing the width of the metal plate.
- the shape of the fuse link 3C provided on the bus bar 3 can be variously changed.
- the fuse link 3C and the surface of the fixed terminal 3A connected to the fuse link 3C are covered with the heat insulating member 8, so that the width of the fuse link 3C is widened and the overall length is shortened.
- the width of the metal plate constituting the fuse link can be increased and the length can be increased.
- the battery pack shown in FIG. 13 is a battery pack according to another embodiment of the present invention, and the fuse link 3C provided on the bus bar has a shape different from that of the bus bar 3 described above.
- the bus bar 3 shown in FIG. 13 is curved by about 90 degrees with a predetermined radius of curvature while the shape of the fuse link 3C connecting the stepped portion 3D of the fixed terminal 3A and the base portion 3B is a strip having a certain width. It is in the form of a strip or a strip that extends in a straight line.
- the bus bar 3 shown in this figure has a shorter length while making the width of the fuse link 3C wider than the bus bar 3 described above.
- the fuse link 3C provided on the bus bar 3 and the fixed terminal 3A connected to the fuse link 3C are covered with the heat insulating member, so that the time required for fusing the fuse link 3C is reduced. Since it can be shortened, as shown in FIG. 13, even if the width of the fuse link 3C is increased and the length is designed to be short, the fuse link 3C can be reliably melted at a predetermined set temperature.
- one bus bar 3 has a plurality of fuse links 3C, and is connected to these fuse links 3C and connected to the electrode terminal 1y (first fixed terminal 3A).
- the terminal 3Aa) is provided, and the fuse link 3C and the fixed terminal 3A are covered with a heat insulating member 8.
- the other bus bar 3 includes a plurality of fixed terminals 3A (second fixed terminals 3Ab) connected to the electrode terminals 1x, but no heat insulating member is provided on the surface of the bus bar 3. .
- the fuse link 3C and the fixed terminal 3A connected to the fuse link 3C are covered with the heat insulating member 8, and the fixed terminal 3A to which the fuse link 3C is not connected is characterized.
- the heat insulating member can be omitted.
- the present invention is a battery pack in which a large number of batteries are stored in a battery holder, and can be effectively used for a battery pack in which a fuse link is connected to the battery to improve safety.
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Abstract
Description
バスバーは、電池を直列や並列に接続する金属板で、一枚の金属板を裁断して製作される。バスバーは、電池を直列や並列に接続するベース部と、電池の電極端子に接続される固定端子とをヒューズリンクで連結している。固定端子はヒューズリンクを介してベース部に接続されるので、電池の電流、すなわち固定端子に流れる電流が設定電流よりも大きくなるとヒューズリンクが溶断されるように設計される。ヒューズリンクが溶断される設定電流は、ヒューズリンクの電気抵抗で調整できるので、導電率の高い金属板からなるヒューズリンクは、細長く形成して設定電流を調整している。一般に金属線の電気抵抗は、長さに比例して断面積に反比例するので、金属板を裁断して形成されるヒューズリンクは、幅を狭くして、長さを長くすることで抵抗値を大きくできる。このため、ヒューズリンクは、設定された過電流が流れると発熱して溶断するように、細長くして電気抵抗を大きくしている。
図の電池パックは、電池1を円筒形電池とする。円筒形電池は、円筒状の外装缶に電極体を収納し、電解液を充填して外装缶の開口部を封口板で密閉している。円筒形電池は、両端面である外装缶の底面と、封口板の中央部に設けた凸部電極とを正負の電極端子1x、1yとしている。両端面に正負の電極端子1x、1yのある円筒形電池は、電池ホルダ2に平行姿勢で配置されて、その両端の電極端子1x、1yを電池ホルダ2の両面に露出して、バスバー3で直列と並列に接続される。図の電池パックは電池1を円筒形電池とするが、本発明は電池を円筒形電池に特定せず、たとえば角形電池とすることもできる。電池はリチウムイオン電池などの非水電解質二次電池である。ただし、本発明は、電池をリチウムイオン電池に特定するものでなく、他の非水電解質二次電池やニッケル水素電池等、現在使用され、これから開発される全ての二次電池が使用できる。
電池ホルダ2は、絶縁材料である熱可塑性樹脂等の樹脂によって所定の形状に成形されている。電池ホルダ2は、好ましくは難燃性に優れた樹脂製とすることができる。このような樹脂として、例えば、PC(ポリカーボネート)やPP(ポリプロピレン)が使用できる。
図1ないし図5に示す電池パックのバスバー3は、多段多列に配置している複数の電池1を直列と並列に接続している。バスバー3は導電性の金属板で、電池1の電極端子1x、1yに接続される複数の固定端子3Aと、固定端子3Aを介して複数の電池1を直列と並列に接続するベース部3Bと、先端を固定端子3Aに連結して付け根部をベース部3Bに連結しているヒューズリンク3Cとを備えている。バスバー3は1枚の金属板を金型で裁断し、また折曲して製作される。図4は電池ホルダ2の表側面に配置されるバスバー3の正面図で、図5は電池ホルダ2の裏側面に配置しているバスバー3の正面図である。電池ホルダ2は、表側面に7枚のバスバー3を配置し、裏側面に8枚のバスバー3を配置して、バスバー3でもって各電池1を並列と直列に接続している。
断熱部材8は、電池1の電極端子1x、1yに接続されたバスバー3の表面に配置されて、少なくともヒューズリンク3Cと、このヒューズリンク3Cに連結された固定端子3Aの表面を密着状態に被覆している。断熱部材8は、絶縁性を有する部材であって、好ましくは樹脂製とする。樹脂製の断熱部材8は、ヒューズリンク3Cと固定端子3Aの表面に密着状態で接触して、ヒューズリンク3C及び固定端子3Aを外部から断熱する。断熱部材8で断熱されるヒューズリンク3C及び固定端子3Aは、電池1の発熱を効果的に伝導し、また、ヒューズリンク3Cに過電流が通電される状態では、ヒューズリンク3Cの発熱を外部に放熱することなく、確実に温度上昇させてヒューズリンク3Cを溶断する。
混合型の樹脂には、エポキシ樹脂や不飽和ポリエステル樹脂等を使用することもできる。また、ポッティング樹脂には、常温ではペースト状または液状であって、経時的に硬化し、あるいは熱や光により硬化される樹脂(熱硬化性樹脂、光硬化性樹脂)を使用することもできる。これらのポッティング樹脂は、未硬化の状態でヒューズリンク3C及び固定端子3Aの表面に充填されると共に、時間が経過して硬化した状態では、ヒューズリンク3C及び固定端子3Aの表面に密着する状態で固定されて優れた断熱特性を実現する。
さらに、断熱部材8は、図11に示すように、樹脂成形された被覆材8Aを備えることができる。この被覆材8Aは、板状またはシート状に樹脂を成形したもので、例えば、接着剤8Bを介してバスバー3の表面、とくに、ヒューズリンク3C及び固定端子3Aの表面に固定される。図11に示す断熱部材8は、接着剤8Bをヒューズリンク3Cや固定端子3Aの周辺部に形成される凹凸部に充填することで、被覆材8A及び接着剤8Bからなる断熱部材8をヒューズリンクと固定端子の表面に密着状態で固定している。板状またはシート状の被覆材8Aは、図11に示すように、バスバー3の外形に沿う形状とすることで、位置決め凹部2Dに挿入されて、バスバー3の表面に沿う状態で定位置に配置される。図11に示す被覆材8Aは、位置決めリブ2Fと対向する位置に連結穴8Fを開口している。
図1ないし図3に示す外装ケース11は、複数の円筒形電池を定位置に配置してなる電池ホルダ2を収納している。図に示す外装ケース11は、第1ケース11Aと第2ケース11Bに分割されており、内部には電池ホルダ2を収納する収納部を形成している。図3に示す第1ケース11Aと第2ケース11Bは、電池ホルダ2のほぼ半分を収納可能な深さを有する箱形としている。この外装ケース11は、第1ケース11Aと第2ケース11Bに設けている周壁の端面を超音波溶着し、あるいは接着して連結される。図示しないが、第1ケースと第2ケースは、一方のケースを貫通する止ネジをして、他方のケースに設けたボスにねじ込んで連結することもできる。
図13に示す電池パックは、本発明の他の実施形態にかかる電池パックであって、バスバーに設けたヒューズリンク3Cを前述のバスバー3と異なる形状としている。図13に示すバスバー3は、固定端子3Aの段差部3Dとベース部3Bとを連結するヒューズリンク3Cの形状を、一定の幅を有する帯状としながら、所定の曲率半径で約90度湾曲された帯状とし、あるいは、直線状に伸びる帯状としている。この図に示すバスバー3は、前述のバスバー3に比較して、ヒューズリンク3Cの幅を広くしつつ、長さを短くしている。このように、本発明の電池パックでは、バスバー3に設けたヒューズリンク3Cとこのヒューズリンク3Cに連結された固定端子3Aとを断熱部材で被覆することで、ヒューズリンク3Cの溶断にかかる時間を短縮できるので、図13に示すように、ヒューズリンク3Cの幅を広くし、長さを短く設計しても、所定の設定温度で確実に溶断することが可能となる。
1x…電極端子
1y…電極端子
2…電池ホルダ
2A…ホルダーユニット
2B…支持面
2C…第2の嵌合部
2D…位置決め凹部
2E…区画壁
2F…位置決めリブ
3…バスバー
3A…固定端子
3Aa…第1の固定端子
3Ab…第2の固定端子
3B…ベース部
3Ba…ヒューズリンク連結部
3C…ヒューズリンク
3D…段差部
3E…溶接部
3F…隙間
3G…凸部
3H…スリット
3I…第1の嵌合部
3J…貫通穴
3K…位置決め穴
4…電池収納部
5…隔壁
7…電極窓
8…断熱部材
8A…被覆材
8B…接着剤
8C…軟質層
8D…凸部
8F…連結穴
9…外周壁
10…回路基板
11…外装ケース
11A…第1ケース
11B…第2ケース
Claims (8)
- 充放電できる複数の電池と、
各々の電池を定位置に配置してなる電池ホルダと、
前記電池の電極端子に固定してなる金属板のバスバーと、
を備え、
前記バスバーは、
前記電池の電極端子に接続される複数の固定端子と、
前記複数の固定端子を介して前記複数の電池を直列及び/又は並列に接続するベース部と、
先端を前記固定端子に連結して、付け根部を前記ベース部に連結しているヒューズリンクとを有しており、
さらに、前記ヒューズリンクと該ヒューズリンクに連結された前記固定端子との表面を密着状態で被覆する断熱部材を備えることを特徴とする電池パック。 - 請求項1に記載される電池パックであって、
前記断熱部材がポッティング樹脂で形成されてなる電池パック。 - 請求項1に記載される電池パックであって、
前記断熱部材が、樹脂成形された被覆材を備え、前記被覆材を前記ヒューズリンクと、該ヒューズリンクに連結された前記固定端子の表面に密着状態で固定してなる電池パック。 - 請求項1から3のいずれか一に記載される電池パックであって、
前記バスバーが複数の前記ヒューズリンクを備えており、該バスバーに設けた全ての該ヒューズリンクの表面を密着状態で被覆する断熱部材が一体的に成形されてなる電池パック。 - 請求項4に記載される電池パックであって、
前記断熱部材が、前記バスバーの表面全体に形成されてなる電池パック。 - 請求項1から5のいずれか一に記載される電池パックであって、
前記電池ホルダは、前記複数の電池を互いに平行な姿勢とし、かつ各電池の両端に設けられた電極端子を同一面に配置すると共に、該電池ホルダの両面において、前記電池の電極端子が前記バスバーで接続されており、
さらに、前記電池ホルダは、前記電池の電極端子が配置される両面に、前記バスバーを配置する位置決め凹部を形成しており、前記位置決め凹部に前記断熱部材を配置してなる電池パック。 - 請求項1から6のいずれか一に記載される電池パックであって、
前記ベース部は、前記ヒューズリンクの付け根部を連結してなるヒューズリンク連結部を有し、このヒューズリンク連結部には第1の嵌合部を設けており、
前記電池ホルダは、前記第1の嵌合部に連結されて前記ヒューズリンク連結部に連結される第2の嵌合部を有し、
前記第1の嵌合部に前記第2の嵌合部が連結されて、前記ヒューズリンク連結部が前記電池ホルダに連結されてなり、
さらに、前記第1の嵌合部と前記第2の嵌合部の連結部が前記断熱部材で固定されてなる電池パック。 - 請求項1から7のいずれか一に記載される電池パックであって、
前記バスバーのベース部は、隣接する前記固定端子の間に位置決め穴を備えており、
前記電池ホルダは、前記位置決め穴に案内されて前記バスバーに連結される位置決めリブを備えており、
前記位置決め穴に前記位置決めリブが連結されて、前記バスバーが前記電池ホルダに連結されてなり、
さらに、前記位置決め穴と前記位置決めリブの連結部が前記断熱部材で固定されてなる電池パック。
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Also Published As
Publication number | Publication date |
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EP3633764A1 (en) | 2020-04-08 |
JP7027415B2 (ja) | 2022-03-01 |
EP3633764B1 (en) | 2023-05-24 |
EP3633764A4 (en) | 2020-06-17 |
JPWO2018221004A1 (ja) | 2020-03-26 |
CN110710026A (zh) | 2020-01-17 |
EP3633764B8 (en) | 2023-05-31 |
US11201364B2 (en) | 2021-12-14 |
US20200076022A1 (en) | 2020-03-05 |
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