WO2017169524A1 - Battery pack - Google Patents

Battery pack Download PDF

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Publication number
WO2017169524A1
WO2017169524A1 PCT/JP2017/008649 JP2017008649W WO2017169524A1 WO 2017169524 A1 WO2017169524 A1 WO 2017169524A1 JP 2017008649 W JP2017008649 W JP 2017008649W WO 2017169524 A1 WO2017169524 A1 WO 2017169524A1
Authority
WO
WIPO (PCT)
Prior art keywords
case
battery
battery pack
battery cell
holder case
Prior art date
Application number
PCT/JP2017/008649
Other languages
French (fr)
Japanese (ja)
Inventor
淳史 高田
政博 川畑
Original Assignee
三洋電機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 三洋電機株式会社 filed Critical 三洋電機株式会社
Publication of WO2017169524A1 publication Critical patent/WO2017169524A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/30—Arrangements for facilitating escape of gases
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/569—Constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals
    • 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 battery cells are housed in a fixed position of a holder case, and more particularly to a battery pack for detecting a temperature abnormality of a battery cell housed in the battery pack.
  • a device including a battery pack in which battery cells such as a lithium ion secondary battery and a nickel hydride secondary battery that can be used repeatedly are connected in multiple series and in parallel is employed.
  • battery cells such as a lithium ion secondary battery and a nickel hydride secondary battery that can be used repeatedly are connected in multiple series and in parallel.
  • lithium ion secondary batteries are frequently used in recent years because they are lightweight but have high electromotive force and high energy density.
  • the battery pack can increase the output voltage by connecting a large number of battery cells in series, and can increase the output current by connecting them in parallel.
  • the number of battery cells to be stored tends to increase.
  • battery cells generate heat when charged and discharged with a large current, it is also important to ensure heat dissipation.
  • high temperature gas may be ejected from the inside or may be ejected as a burning flame.
  • the other battery cells function normally and can be used as a battery pack. It may become.
  • similar burning spreads from the battery cell in which an abnormality has occurred to the adjacent battery cell, and combustion, smoke generation, and the like in the battery pack may further expand and become a dangerous state. For this reason, it is necessary to quickly detect and protect the abnormality of some batteries.
  • the present invention has been made in view of such a background, and one object of the present invention is a battery pack that can quickly detect abnormalities caused by ejected bodies such as high-temperature gas ejected from battery cells and flames at the time of ignition. Is to provide.
  • a plurality of battery cells 1 formed by closing the opening of a cylindrical, bottomed outer can 11 with a sealing plate 12.
  • a holder case 2 for holding the plurality of battery cells 1 in a posture parallel to each other and holding the electrode terminals 13 provided at both ends of each battery cell 1 on the same surface;
  • a pair of bus bar plates 4 disposed to which the electrode terminals 13 of the battery cells 1 are connected, a cover member 5 disposed on the upper and lower sides of the holder case 2 to cover the bus bar plate 4, the holder case 2 and the cover
  • a temperature detection unit 6 that is disposed between the member 5 and detects the ambient temperature is provided.
  • a discharge space 7 is formed in which the ejected body ejected from the end surface of the battery cell 1 flows in when the battery cell 1 is abnormal.
  • the discharge space 7 is closed at the periphery, and is provided with an opening 35 that allows a part of the surrounding area to communicate with the outside and allow the ejected matter to pass through.
  • the temperature detection unit 6 approaches the opening 35. Is arranged.
  • the temperature abnormality can be detected by reliably passing the ejected body ejected from the end surface of the battery cell to the temperature detection unit.
  • the battery pack has a discharge space for allowing the ejector from the battery cell to flow between the holder case and the cover member, and the discharge space is opened by communicating a part of the closed periphery to the outside. This is because the temperature detection unit is disposed in the opening.
  • the holder case 2 is divided into the first case 2X and the second case 2Y, and the first case 2X and the second case 2Y
  • positioned inside can be provided, and the surrounding wall 23 formed along the circumference
  • the first case 2 ⁇ / b> X and the second case 2 ⁇ / b> Y form a storage recess 25 in which the bus bar plate 4 is disposed on the outer surface of the end surface plate part 22, and close the storage recess 25 with the cover member 5 to form a discharge space 7. be able to.
  • a 1st case and a 2nd case are comprised with the end surface plate part by which the end surface of a battery cell is arrange
  • a discharge space can be easily formed.
  • the storage recess where the bus bar plate is placed is also used as the discharge space
  • the cover member that covers the bus bar plate is also used as the member that forms the discharge space. Can be reduced.
  • the plurality of battery cells 1 are arranged in the same direction and stored in the holder case 2, and the end face plate portion 22 is provided in the first case 2X and the second case 2Y.
  • a plurality of battery cells 1 can be connected in parallel by opening the connection hole 24 penetrating, exposing the electrode terminal 13 of the battery cell 1 from the connection hole 24, and connecting the electrode terminal 13 to the bus bar plate 4. .
  • a plurality of battery cells are arranged in the same direction and stored in the holder case, and the electrode terminals of the battery cells are exposed from the connection holes opened in the end face plate portions of the first case and the second case.
  • a plurality of battery cells can be easily connected in parallel by connecting to the bus bar plate.
  • the holder case 2 can be formed of a thermosetting resin.
  • the holder case is formed of a thermosetting resin, thereby realizing excellent heat resistance and chemical resistance.
  • the opening 35 can be formed in the discharge space 7 facing the end portion of the battery cell 1 where the sealing plate 12 is provided.
  • the temperature detector 6 can be used as a thermal fuse, and one end can be connected to the bus bar plate 4 and the other end can be connected to the outside via the lead wire 76. . According to the above configuration, if any of the battery cells becomes abnormal and high-temperature gas or flame is discharged, the thermal fuse is blown and the battery voltage cannot be detected by the lead wire. Thus, abnormality of the battery cell can be detected.
  • FIG. 2 is a sectional view taken along line II-II of the battery pack shown in FIG.
  • FIG. 3 is a cross-sectional view of the battery pack shown in FIG. 1 taken along the line III-III. It is a disassembled perspective view of the battery pack shown in FIG. It is the disassembled perspective view which looked at the battery pack shown in FIG. 4 from the lower side. It is a disassembled perspective view of the holder case of the battery pack shown in FIG. It is a disassembled perspective view which shows another example of a holder case.
  • FIG. 3 is a partially enlarged exploded perspective view of a first bus bar plate. It is a partial expansion exploded perspective view of the 2nd bus bar plate. It is a principal part expanded sectional view which shows the connection process of a bus-bar plate and a battery cell. It is a schematic plan view which shows the internal structure of the battery pack formed by connecting a plurality of battery packs.
  • each element constituting the present invention may be configured such that a plurality of elements are configured by the same member and the plurality of elements are shared by one member. It can also be realized by sharing.
  • the battery pack of the present invention can be used as a power source for a stationary power storage facility.
  • a power storage device for a power plant, power generation facility, factory, or public facility the battery pack is charged by solar power generation or wind power generation, or at midnight. It can be applied to a power storage device that is charged with electric power and discharged when necessary.
  • a plurality of battery packs can be connected and connected in series and / or in parallel to increase the output to constitute a power storage device.
  • the power storage device can control charging / discharging of each battery pack by connecting a plurality of battery packs in a daisy chain and connecting a controller to the terminal end.
  • the battery pack of the present invention is not limited to such a power source for power storage facilities, but is also used for a street light power source that charges sunlight during the day and discharges it at night, a traffic light that is driven during a power failure, and a computer server Needless to say, the present invention can also be used for a backup power supply for a wireless base station such as a mobile phone or a mobile phone.
  • FIG. 1 is a perspective view of the battery pack
  • FIG. 2 is a cross-sectional view taken along line II-II of the battery pack of FIG. 1
  • FIG. 3 is a cross-sectional view taken along line III-III of FIG. 1
  • FIG. 5 is an exploded perspective view of the battery pack of FIG. 4 viewed from below
  • FIG. 6 is an exploded perspective view of the holder case.
  • the battery pack 10 shown in these drawings includes a plurality of battery cells 1 in which openings of a cylindrical and bottomed outer can 11 are closed with a sealing plate 12, and a plurality of battery cells 11 are parallel to each other.
  • the holder terminal 2 that holds the electrode terminals 13 provided at both ends of each battery cell 1 in the same plane and the upper and lower surfaces of the holder case 2 are connected to the electrode terminals 13 of the battery cell 1.
  • a pair of bus bar plates 4 arranged on the upper and lower outer sides of the holder case 2 and disposed between the cover member 5 covering the bus bar plate 4 and the holder case 2 and the cover member 5, the ambient temperature is reduced.
  • a temperature detection unit 6 for detection.
  • a discharge space 7 is formed between the cover member 5 and the holder case 2 to allow the ejected body ejected from the end face of the battery cell 1 to flow when the battery cell 1 is abnormal.
  • the discharge space 7 is closed at the periphery, and is provided with an opening 35 that allows a part of the surrounding area to communicate with the outside and allow the ejected matter to pass through.
  • the temperature detection unit 6 approaches the opening 35. Is arranged.
  • the battery cell 1 is a lithium ion secondary battery that can be charged and discharged.
  • the battery cell is not limited to a lithium ion secondary battery, and may be a battery that can be charged and discharged, such as a nickel metal hydride battery or a nickel cadmium battery.
  • a cylindrical battery is used in the battery pack of the present embodiment.
  • the present invention is not limited to this, and a square battery or a flat battery may be used.
  • the battery cell 1 stores an electrode body (not shown) in a cylindrical and bottomed outer can 11 and is filled with an electrolyte solution to open the outer can 11.
  • the part is closed with a sealing plate 12.
  • the battery cell 1 uses the bottom surface of the outer can 11 as both end surfaces and the sealing plate 12 closed in an insulating state at the opening of the outer can 11 as positive and negative electrode terminals 13.
  • the battery cell 1 shown in FIG. 6 has a metal plate formed in a disk shape having a central recess without providing a convex electrode on the sealing plate 12 while increasing the strength by using the outer can 11 as iron or an iron alloy. Is used.
  • a sealing plate 12 aluminum or an aluminum alloy can be used.
  • the battery cell 1 having this structure can lower the strength of the aluminum sealing plate 12 relative to the iron outer can 11, so that the internal pressure becomes abnormally high due to overcharge or internal short circuit. When this occurs, the aluminum sealing plate 12 can be opened preferentially, and the internal gas or the like can be quickly discharged to the outside to ensure safety.
  • the battery cell may have a structure in which a protruding electrode 14 is provided on a sealing plate 12.
  • a safety valve (not shown) is provided on the sealing plate 12 or the convex electrode 14, and when the internal pressure of the battery cell 71 rises, the safety valve is opened and the internal gas can be exhausted to the outside. it can.
  • the holder case 2 shown in FIGS. 2, 3, and 6 accommodates a plurality of battery cells 1 in a parallel posture.
  • the plurality of battery cells 1 are arranged in the same direction. That is, in the figure, the bottom end of the outer can 11 is positioned downward, and the end closed by the sealing plate 12 is positioned upward.
  • the holder case 2 holds the electrode terminals 13 provided at both ends of each battery cell 1 at a fixed position in a posture where they are arranged on the same surface.
  • the holder case 2 is divided into a first case 2X and a second case 2Y in the longitudinal direction of the battery cell 1 and in the middle of the thickness direction.
  • the first case 2X and the second case 2Y are each provided with a holding portion 21 for inserting and holding the end of the cylindrical battery cell 1 individually.
  • the first case 2 ⁇ / b> X and the second case 2 ⁇ / b> Y include an end surface plate portion 22 provided with a plurality of holding portions 21 into which end portions of the battery cell 1 are inserted on the inner surface, and a peripheral wall formed along the periphery of the end surface plate portion 22. 23.
  • the first case 2 ⁇ / b> X and the second case 2 ⁇ / b> Y have an overall outer shape of a substantially rectangular shape, and the opposing opening edges of the peripheral wall 23 are connected to each other.
  • maintenance part 21 is formed in the shape which can insert and hold
  • the holding portion 21 shown in the figure has a shape that follows the outer peripheral surface of the battery cell 1 and preferably has a shape that allows the outer peripheral surface of the battery cell 1 to approach or contact the outer peripheral surface of the battery cell 1 without a gap.
  • a plurality of recesses are provided inside the end face plate portion 22.
  • the plurality of holding portions 21 are formed so that the battery cell 1 inserted therein can be held in a substantially vertical posture with respect to the end face plate portion 22.
  • the holder case 2 forms a holding portion 21 having an inner cylindrical shape so that the cylindrical battery cell 1 can be accommodated.
  • these holding portions 21 join the first case 2 ⁇ / b> X and the second case 2 ⁇ / b> Y so as to sandwich the battery cell 1 from both sides, thereby connecting the plurality of battery cells 1.
  • the holder case 2 can be stored in a fixed position.
  • the holding portion is a cylindrical portion having an inner shape that follows the outer shape of the battery cell, and a plurality of the cylindrical portions can be arranged.
  • the plurality of holding portions 21 are provided in a predetermined arrangement inside the first case 2X and the second case 2Y, respectively.
  • the number of holding parts 21 formed in the holder case 2 is determined by the number of battery cells 1 to be stored.
  • the holder case 2 is provided with 76 holding portions 21 in the first case 2X and the second case 2Y, respectively.
  • the holding portions 21 of the holder case 2 shown in FIG. 6 are formed in nine rows from the first surface 2A to the third surface 2C, and in each row, the holding portions 21 are directed from the second surface 2B to the fourth surface 2D.
  • a total of 76 holding portions 21 are provided by arranging 8-9 pieces in a straight line at equal intervals.
  • the holding portions 21 formed over multiple rows are arranged so that the adjacent battery cells 1 are located between adjacent battery cells 1 in one row, that is, in a staggered state.
  • the battery cell 1 can be arranged.
  • the battery cell 1 is accommodated in 76 holding portions 21.
  • the depth of the holding portion 21 formed in the concave shape is 5 to 30%, preferably 10 to 25%, more preferably 15 to 25% of the length of the battery cell 1. Furthermore, by joining the first case 2X and the second case 2Y so as to sandwich the battery cell 1 from both sides, the two holding portions 21 store and hold both ends of the battery cell 1, and the battery cell. A hollow portion 20 is formed in the holder case 2 so that the intermediate portion of the battery cell is exposed in the holder case 2. Thereby, since each battery cell which the intermediate part of the battery cell 1 adjoins can be spaced apart, the cooling effect of a battery cell can be improved.
  • a connection hole 24 penetrating the bottom surface of the holding portion 21 is opened in the end face plate portion 22.
  • the end surface plate portion 22 exposes the electrode terminal 13 from the connection hole 24 opened on the outer surface in a state where the end portion of the battery cell 1 is inserted into the holding portion 21 provided inside.
  • the connection hole 24 is made smaller than the outer shape of the outer can 11 of the battery cell 1 inserted into the holding portion 21 so as to prevent passage of the battery cell 1. .
  • the end portion of the battery cell 1 inserted into the holding portion 21 can be stopped at a fixed position of the connection hole 24 without penetrating the end face plate portion 22.
  • the electrode terminal 13 of the battery cell 1 exposed from the connection hole 24 of the end face plate portion 22 is connected to the bus bar plate 4 disposed outside the end face plate portion 22 as will be described in detail later.
  • the first case 2X and the second case 2Y shown in FIG. 4 to FIG. 6 have a storage recess 25 in which the bus bar plate 4 is disposed on the outer surface of the end face plate portion 22.
  • the first case 2 ⁇ / b> X and the second case 2 ⁇ / b> Y shown in the drawing have a peripheral wall 23 provided around the end face plate part 22 protruding outside the end face plate part 22, and are formed by the protruding part and the end face plate part 22.
  • the recessed portion to be stored is used as a storage recess 25 to store the bus bar plate 4.
  • the bus bar plate 4 is disposed in the storage recess 25 and the outside of the storage recess 25 is closed by the cover member 5.
  • the cover member 5 includes a side wall portion 52 along the periphery of the closing plate portion 51, and the side wall portion 52 is connected to the peripheral wall 23 protruding to the outside of the holder case 2 to close the periphery of the cover member 5. Yes.
  • the holder case 2 can also have a vent opening in the peripheral wall 23 that is the side surface. Thereby, ventilation is made inside and outside the holder case 2, and the heat dissipation characteristics of the battery cell 1 stored in the holder case 2 can be further improved.
  • the first case 2X and the second case 2Y are formed by injection molding using a mold.
  • the holder case 2 is made of a member having excellent insulating properties, preferably a resin.
  • a resin thermoplastic resins such as PC (polycarbonate), PP (polypropylene), and PBT, and thermosetting resins such as unsaturated phenol resins and unsaturated polyesters can be used.
  • thermosetting resin it is formed by compression molding or injection compression molding.
  • the structure in which the holder case is molded with a thermoplastic resin can simplify the injection molding using a mold, and can reduce the manufacturing cost by using an inexpensive thermoplastic resin.
  • the holder case since the holder case may be heated to a high temperature when the battery cell is abnormal, it can be manufactured from a thermoplastic resin according to the capacity and number of battery cells used, the usage environment, and the required heat resistance. it can.
  • the structure in which the holder case 2 is molded with a thermosetting resin increases the time for injecting the molten resin into the mold during molding using the mold, and is heated and cured after the injection. Since a process is required, there is a problem that mass production cannot be efficiently performed in a short time, and a problem that the manufacturing cost is increased by using an expensive thermosetting resin.
  • the plurality of battery cells 1 are arranged at fixed positions by interposing the positioning spacer 3 between the first case 2X and the second case 2Y constituting the holder case 2, so that the first Even if the holding portions 21 formed in the case 2X and the second case 2Y are shallow, it is possible to hold the battery cells with the holding portions 21 while sandwiching both end portions from both sides.
  • thermosetting resin is preferably used as the resin for manufacturing the holder case.
  • the positioning spacer 3 is disposed between the holding part 21 of the first case 2X and the holding part 21 of the second case 2Y, holds the intermediate part of the plurality of battery cells 1, and these battery cells 1 Specify the position of.
  • the positioning spacer 3 shown in FIG. 6 is a perforated plate having a plurality of insertion holes 3 ⁇ / b> A that penetrate the battery cell 1 and hold the middle part of the battery cell 1. 3 A of insertion holes opened by the positioning spacer 3 are provided in the position facing the holding
  • the insertion hole 3 ⁇ / b> A has an inner shape that comes into contact with the outer peripheral surface of the battery cell 1, so that an intermediate portion of the battery cell 1 can be held at a fixed position.
  • the positioning spacer 3 holds the middle part of the battery cell 1 inserted into the insertion hole 3 ⁇ / b> A so that the battery cell 1 can be positioned at a fixed position in the holder case 2.
  • the above battery pack 10 holds the plurality of battery cells 1 with the positioning spacer 3 and holds the both ends of the battery cell 1 from both sides between the first case 2X and the second case 2Y.
  • a large number of battery cells 1 can be easily inserted into the opposing holding portions 21 while being positioned.
  • the battery cell 1 is inserted into the insertion hole 3A of the positioning spacer 3, and the end on the insertion side is the holding portion 21 of the first case 2X. By inserting the battery cell 1 into the first case 2X, the battery cell 1 can be positioned.
  • the battery cell 1 arranged in the first case 2X has the middle portion held in place by the positioning spacer 3, so that the position of the upper end is positioned, and the second case 2Y is The upper end portion of the battery cell 1 can be reliably inserted into the holding portion 21 of the second case 2Y while being covered from above.
  • This structure can hold the battery cell while positioning the battery cell substantially in the same state as the battery storage part that stores about half the length of the battery cell 1. Therefore, the opposite end portion can be quickly inserted into the opposing holding portion, and both end portions of the battery cell 1 can be held so as to be sandwiched from both sides. Thereby, the work efficiency at the time of an assembly can be improved.
  • the positioning spacer 3 can be easily inserted through the battery cell 1 by reducing its thickness, and the region exposed in the holder case 2 can be widened while holding the middle part of the battery cell 1. it can. Therefore, the thickness of the positioning spacer can be preferably 10% or less of the total length of the battery cell.
  • Such positioning spacer 3 can be made of resin or metal.
  • the above positioning spacer 3 is sandwiched between the peripheral walls 23 facing each other of the first case 2X and the second case 2Y, and is arranged in the middle of the holder case 2.
  • a positioning spacer 3 is arranged along the opening edge of the peripheral wall 23 of the first case 2X which is the lower case.
  • the holder case 2 is fixed at a fixed position by sandwiching the positioning spacer 3 between the opposing peripheral walls 23 of the first case 2X and the second case 2Y.
  • the step recess can be provided in the second case.
  • the positioning spacer can also be fixed to the holder case by bonding or by screwing or locking structure.
  • the holder case 2 in which the plurality of battery cells 1 are housed is connected to the connection boss 29 provided at the opposing position of the first case 2X and the second case 2Y as shown in FIG. 39 is screwed to fix the first case 2X and the second case 2Y.
  • a connecting boss 29 is integrally formed on the end plate portion 22 and the peripheral wall 23.
  • the first case and the second case can be connected to each other via a connecting bolt and a nut.
  • the holder case may have a structure shown in FIG.
  • the holder case 72 shown in this figure is divided into a first case 72X and a second case 72Y in the longitudinal direction of the battery cell 71 and in the middle of the thickness direction, and the first case 72X and the second case 72Y. Between 72Y, the battery holder 70 which inserts the several battery cell 71 and hold
  • the first case 72X and the second case 72Y shown in FIG. 7 are also formed along the periphery of the end surface plate portion 22 and the end surface plate portion 22 where the connection terminals 13 that are the end surfaces of the battery cells 71 are disposed inside. And a peripheral wall 23.
  • the first case 72X and the second case 72Y also have an overall outer shape that is substantially rectangular, and the opposing opening edges of the peripheral wall 23 are connected to each other.
  • the battery holder 70 shown in FIG. 7 has a shape formed by connecting a plurality of holding cylinders 73 into which the battery cells 71 are inserted, and the battery cells 71 are inserted into the holding cylinders 73 so that the plurality of battery cells 71 are inserted.
  • the holder case 72 is arranged at a fixed position.
  • the battery holder 70 shown in the figure is divided into a plurality of divided units 70A, and these divided units 70A can be individually fixed at fixed positions in the holder case 72.
  • the battery holder 70 also has a structure in which a plurality of battery cells 72 can be accommodated in the same arrangement as the holding portion 21 described above.
  • Such a battery holder can be made of metal such as aluminum, or can be made of resin.
  • the battery holder made of metal can effectively dissipate heat by increasing heat conduction.
  • the resin battery holder can be made lightweight and inexpensive.
  • the battery pack 10 of FIGS. 2 to 5 includes a bus bar plate 4 on the upper and lower outer sides of the holder case 2 for connecting the electrode terminals 13 at both ends of the plurality of battery cells 1 stored in the holder case 2.
  • the bus bar plate 4 is a flat metal plate that covers the outside of the end face plate portion 22, and a plurality of bus bar plates 4 are connected to connect the electrode terminals 13 of the plurality of battery cells 1 exposed from the connection holes 24 of the end face plate portion 22.
  • the through hole 40 is opened. These through holes 40 are opened at positions facing the connection holes 24 opened in the end face plate portion 22.
  • the bus bar plate 4 is electrically connected to the electrode terminals 13 of the plurality of battery cells 1 housed in the holder case 2.
  • the battery pack 10 shown in the drawing is a first bus bar plate 4X disposed on the lower surface side of the first case 2X which is the lower case of the holder case 2 and outside the end surface plate portion 22, and a first case which is an upper case.
  • a second bus bar plate 4Y disposed on the upper surface side of the two cases 2Y and outside the end surface plate portion 22 is provided.
  • These bus bar plates 4 have a shape and a size that cover the entire end surface plate portion 22, and are sized so that the electrode terminals 13 of all the battery cells 1 accommodated in the holder case 2 can be connected.
  • the bus bar plate 4 is fixed to the holder case 2 via a set screw (not shown) penetrating therethrough. With this structure, the bus bar plate 4 can be securely fixed to a fixed position of the holder case 2.
  • the bus bar plate 4 is connected to the battery cell 1 via the lead plate 45 as shown in FIGS.
  • the lead plate 45 shown in FIGS. 8 and 9 is a thin metal plate.
  • the lead plate 45 has a connection hole 45A at a position facing the through hole 40 of the bus bar plate 4 and is connected to the connection piece 46 at the connection hole 45A. 47 are provided.
  • the connection pieces 46 and 47 are integrally connected to the lead plate 45.
  • the lead plate 45 is fixed to the bus bar plate 4 so that the connection pieces 46 and 47 are located in the through holes 40 opened in the bus bar plate 4.
  • the bus bar plate 4 shown in FIGS. 8 and 9 is composed of a single lead plate 45.
  • connection pieces 46 and 47 of the lead plate 45 are connected to the battery cell 1 by connecting the connection pieces 46 and 47 of the lead plate 45 to the electrode terminal 13 of the battery cell 1. Therefore, the connection pieces 46 and 47 are disposed at positions facing the connection terminals 13 exposed from the connection holes 24. As shown in FIG. 10, the connection pieces 46 and 47 are formed in a shape and size that are welded to the connection terminal 13 in a state where the welding rod 60 is pressed. Further, the lead plate 45 shown in FIG. 8 has a fusing part 48 formed between the opening edge of the coupling hole 45 ⁇ / b> A and the connection piece 46. The fusing part 48 shown in the drawing is a long and thin line and is formed in a crank shape. The fusing part 48 is cut in a state where an overcurrent flows, so that the electrode terminal 13 of the battery cell 1 can be reliably cut off from the lead plate 45. Yes.
  • the bus bar plate 4 to which the lead plate 45 is fixed is arranged in a state of being laminated on the outer surface of the end face plate portion 22, and the connection piece 47 of the lead plate 45 is connected to the connection hole of the end face plate portion 22. 24.
  • the connection piece 47 disposed in the connection hole 24 is welded to the electrode terminal 13 of the battery cell 1.
  • the welding rod 60 is welded by pressing the connection piece 47 of the lead plate 45 to the electrode terminal 13 exposed from the connection hole 24 of the end face plate portion 22.
  • the welding rod 60 is welded while passing through the through hole 40 of the bus bar plate 4 and pressing the connection piece 47 against the electrode terminal 13 of the battery cell 1.
  • the electrode terminals 13 at both ends of the plurality of battery cells 1 housed in the holder case 2 are connected to the first bus bar plate 4X and the second bus bar plate 4Y, whereby the plurality of battery cells are connected. 1 are connected in parallel.
  • the bus bar plate 4 shown in FIGS. 4 and 5 includes bent pieces 41 and 43 bent along the peripheral wall 23 from the outer peripheral edge of the end face plate portion 22, and the distal ends of the bent pieces 41 and 43. The portions are further bent to form external connection portions 42 and 44.
  • the battery pack 10 shown in FIGS. 1 to 5 is a side surface facing the holder case 2 having a rectangular outer shape, and a bent piece 41 is disposed on the first surface 2A, and the bent piece is formed on the third surface 2C. 43 is arranged.
  • the first bus bar plate 4X has a bent piece 41 arranged along the first surface 2A of the holder case 2.
  • the bent piece 41 is formed so as to rise from the lower surface side of the first case 2X along the first surface 2A, and the front end portion is bent in the horizontal direction to form the external connection portion 42.
  • the second bus bar plate 4Y has a bent piece 43 disposed along the third surface 2C of the holder case 2.
  • the bent piece 43 is formed so as to hang down from the upper surface side of the second case 2Y along the second surface 2C, and the distal end portion thereof is bent in the horizontal direction to form an external connection portion 44.
  • the holder case 2 has a step surface 28 on which the external connection portion 44 is disposed on the third surface 2C on which the bent piece 43 of the second bus bar plate 4Y is disposed. In this way, by arranging the external connection portion 44 on the step surface 28, the bent piece 43 and the external connection portion 44 are arranged at fixed positions of the holder case 2. In addition, the external connection portion 44 can be reliably externally connected to the stepped surface 28.
  • the battery pack 10 is provided with a cover member 5 that covers the bus bar plate 4 and is positioned outside the upper surface side and the lower surface side of the holder case 2 to which the bus bar plate 4 is fixed.
  • the cover member 5 shown in the figure covers and insulates the surface of the bus bar plate 4.
  • the cover member 5 is preferably an insulating member, and is preferably made of resin. Thereby, insulation and weight reduction can be realized at low cost.
  • a metal cover member such as aluminum can also be used.
  • the surface of the metal cover member can be covered with an insulating member such as a laminate film or vinyl, or can be insulated by applying an insulating paint.
  • the cover member 5 has a shape and a size covering the upper and lower surfaces of the holder case 2.
  • the cover member 5 shown in the drawing includes a flat closing plate portion 51 that follows the inner shape of the holder case 2 and a side wall portion 52 that is connected to the periphery of the closing plate portion 51.
  • the side wall 52 is provided with a locking projection 54 on the outer peripheral surface, and the locking projection 54 is locked to the locking portion 32 provided on the peripheral wall 23 of the holder case 2 so as to be fixed to the holder case 2.
  • the peripheral wall 23 shown in the drawing has a locking hole as a locking portion 32 that locks the locking projection 54. Further, in the holder case 2 shown in FIGS.
  • the peripheral wall 23 to which the side wall 52 is connected has a double wall structure including an outer peripheral wall 23a and an inner peripheral wall 23b.
  • the side wall 52 is inserted into the gap formed between the cover member 5 and the holder case 2.
  • the peripheral wall 23 shown in the figure forms an engaging portion 32 by opening the aforementioned engaging hole in the outer peripheral wall 23a.
  • the cover member 5 can be more firmly fixed to the holder case 2 by making the connecting portion on the holder case 2 side have a double wall structure of the outer peripheral wall 23a and the inner wall 23b.
  • the cover member 5 shown in FIG. 2 to FIG. 5 covers the first cover member 5X that covers the lower surface side on the outer side of the first case 2X, and the upper surface side that is the outer side of the second case 2Y side.
  • a second cover member 5Y covers the cover member 5 covers the upper surface side of the second case 2Y with the second cover member 5Y, so that the battery cell 1 is interposed between the end plate portion 22 of the second case 2Y and the second cover member 5Y.
  • a discharge space 7 is provided so as to face the end of the sealing plate 12 side.
  • the first cover member 5X includes a closing plate portion 51 that closes the lower surface side of the first case 2X, and a side wall portion 52 that is connected to the periphery of the closing plate portion 51 and closes the four side surfaces of the first case 2X. I have.
  • the first cover member 5X shown in FIGS. 4 and 5 connects and closes the side wall 52 to the peripheral wall 23 on the second surface 2B, the third surface 2C, and the fourth surface 2D of the holder case 2, and On the surface 2A, the cover side wall 52A that covers the outer surface of the bent piece 41 of the first bus bar plate 4X is closed by being brought close to the bent piece 41.
  • the first cover member 5X shown in the figure has a high cover side wall 52A so that the outer surface of the bent piece 41 can be covered with a wide area.
  • the cover side wall portion 52A By covering the bent piece 41 with the cover side wall portion 52A, it is possible to avoid unintentional contact between the first bus bar plate 4X and the outside while arranging the bent piece 41 in a fixed position. Yes.
  • the second cover member 5Y includes a closing plate portion 51 that closes the upper surface side of the second case 2Y, and a side wall portion that is connected to the periphery of the closing plate portion 51 and closes the four side surfaces of the second case 2Y. 52.
  • the second cover member 5Y of FIGS. 4 and 5 connects and closes the side wall 52 to the peripheral wall 23 on the first surface 2A, FIG. 2 surface 2B, and the fourth surface 2D of the holder case 2, and
  • a rib-shaped blocking portion 56 that closes the end edge portion of the second bus bar plate 4 ⁇ / b> Y on the bent piece 43 side is formed to protrude from the inner surface of the closing plate portion 51.
  • the second cover member 5Y closes the cover side wall portion 52B that covers the outer surface of the bent piece 43 of the second bus bar plate 4Y close to the bent piece 43.
  • the second cover member 5Y shown in FIGS. 4 and 5 is provided with a cutout portion 52C by cutting off the end portion of the cover side wall portion 52B and the second surface 2B side.
  • the cut portion 52 ⁇ / b> C covers the upper surface of the projecting coupling portion 36 provided in the holder case 2.
  • the battery pack 10 includes a cover member 5 that closes a storage recess 25 formed on the outer side of the end surface plate portion 22 that is the upper and lower surfaces of the holder case 2.
  • a discharge space 7 is formed between the case 2 and the cover member 5 for allowing a spray body sprayed from the end face of the battery cell 1 to flow in.
  • a bus bar plate 4 is disposed in a discharge space 7 formed between the holder case 2 and the cover member 5.
  • the bus bar plate 4 disposed in the discharge space 7 is stacked on the end face plate portion 22, and a gap formed between the bus bar plate 4 and the cover member 5 is defined as the discharge space 7.
  • Such a discharge space 7 can have a gap width of several mm to several cm.
  • the battery pack 10 described above is abnormally generated in the battery cell 1 and further overheated, high temperature gas may be ejected from the inside or may be ejected as a burning flame.
  • the battery cell 1 is likely to be in a state in which a jet body such as high-temperature gas or flame is ejected from the sealing plate 12 formed by closing the opening of the outer can 11. Therefore, in the battery pack 10, the discharge space 7 formed outside the second case 2Y on the side where the sealing plate 12 of the battery cell 1 is disposed has an opening 35 that communicates with the discharge space 7 to the outside. Provided. Thereby, the high-temperature ejected matter discharged from the battery cell 1 in which an abnormality has occurred can be guided and discharged from the opening 35 to the outside.
  • the battery pack shown in FIGS. 1 to 5 is a discharge space 7 facing the end portion of the battery cell 1 where the sealing plate 12 is provided, and the discharge space 7 provided on the upper surface side of the holder case 2 has a side wall portion. 52, the periphery is closed, and a part of the surrounding area is communicated to the outside without being blocked by the side wall portion 52, and the ejected matter discharged from the end face of the battery cell 1 when the battery cell 1 is abnormal passes.
  • An opening 35 is provided.
  • the holder case 2 shown in the drawing is a corner portion (upper right portion in FIG. 4) of the third surface 2C, which is a side surface, at a position facing the cutout portion 52C provided in the second cover member 5Y in the horizontal direction.
  • a protruding connecting portion 36 that protrudes is provided, and an opening 35 that allows the discharge space 7 to communicate with the outside is provided by partially removing the side wall formed on the upper surface side of the protruding connecting portion 36.
  • the holder case 2 has the upper surface side of the second case 2Y closed by the second cover member 5Y, and the upper surface side of the projecting coupling portion 36 is closed by the end of the closing plate portion 51, and the opening 35 By disposing the cut portion 52C, the discharge space 7 is communicated to the outside through the opening 35.
  • the opening 35 is the only region that allows the discharge space 7 whose periphery is closed to communicate with the outside, and allows the ejected matter discharged from the battery cell 1 in which an abnormality has occurred to pass outside. Discharge.
  • the battery pack 10 has a temperature detection unit 6 for detecting a temperature abnormality in the vicinity of the opening 35.
  • the battery pack 10 is a part of the bus bar plate 4, and the temperature detection unit 6 is disposed facing a specific part of the holder case 2.
  • the connecting piece 4a of the bus bar plate 4 is arranged on the upper surface of the protruding connecting portion 36, and the temperature detecting unit 6 is arranged on the upper surface of the connecting piece 4a.
  • the temperature detection unit 6 shown in the figure is a battery that can reliably detect heat generated when an abnormality occurs in any of the battery cells 1 and a high-temperature ejected matter is discharged from the battery end face or ignites. It is arranged close to the opening 35 through which the ejected matter ejected from the cell 1 passes.
  • the battery pack 10 shown in FIG. 2 shows a state where an abnormality occurs in any one of the battery cells 1 (battery cell in the center in FIG. 2) and a high-temperature ejected matter is discharged by a chain line.
  • a state in which the ejected matter discharged from the air passes through the discharge space 7 and is discharged to the outside from the opening 35 is indicated by an arrow.
  • the ejected matter discharged from the battery cell 1 in which an abnormality has occurred flows into the discharge space 7, but the discharge space 7 is blocked by the side wall portion 52 and the blocking portion 56.
  • the ejected matter is not discharged to the outside from the closed portion, and is discharged to the outside through the opening 35 formed in the cutout portion 52C in which the side wall portion 52 is cut off. For this reason, the high-temperature ejected product flowing into the discharge space 7 reliably passes through the opening 35 when discharged to the outside, and is detected by the temperature detector 6 disposed close to the opening 35. A temperature abnormality can be reliably detected.
  • the second cover member 5Y shown in FIGS. 2 and 4 has a stepped portion 55 formed by molding the closing plate portion 51 one step lower at the edge on the opening 35 side.
  • the inner surface of the step portion 55 is brought close to the temperature detection portion 6, and the ejected matter discharged from the discharge space 7 is shown in FIG. As shown, the temperature can be reliably detected by passing the temperature detector 6 so as to approach it.
  • Temperature detector 6 can use a current interrupting element such as a fuse or a breaker that senses a temperature rise and interrupts the current, or a temperature sensor that detects the ambient temperature. When a high-temperature gas is discharged from the opening 35, a current interruption element such as a fuse or a breaker is blown by the heat of the high-temperature gas, or reverses the movable contact to interrupt the current.
  • the temperature detection unit 6 that is such a current interruption element can be connected to, for example, a lead wire that detects an intermediate potential of the battery cell.
  • FIG. 11 shows a battery pack 100 including a plurality of battery packs 10.
  • the battery pack 100 shown in this figure includes ten battery packs 10, and these battery packs 10 are housed in an outer case 8 and connected in series with each other. Furthermore, a lead wire 76 for detecting an intermediate potential is connected to each battery pack 10.
  • the temperature detection unit 6, which is a current interruption element is connected to the connecting piece 4 a of the bus bar plate 4, and the other end is disposed outside the battery pack 10 via the lead wire 76. Connected to.
  • the detection line for detecting the intermediate potential is cut off by operating the current interrupting element.
  • the controller 75 cannot detect the intermediate potential of the battery pack 10 in which the abnormal battery cell 1 is stored. Thereby, the battery pack 10 including the battery cell 1 in which an abnormality has occurred can be quickly identified.
  • the temperature detector which is a temperature sensor, detects the ambient temperature as a change in resistance value.
  • the temperature detection unit can detect that an abnormality has occurred in one of the battery cells from the detected temperature of the temperature sensor.
  • the above battery pack 10 stores the battery cells 1 in 76 holding portions 21 provided in the holder case 2.
  • this battery pack 10 has 76 battery cells 1 having a battery capacity of 4.62 Ah / cell, connected in parallel via the bus bar plate 4, and has a large capacity of about 3V to 4.15V.
  • a battery pack 10 is configured. It should be noted that the number, arrangement and connection of the battery cells 1 stored in the holder case 2 are not limited to this, and needless to say, it can be changed depending on the required voltage and output capacity.
  • the present invention is a battery pack in which a plurality of battery cells are housed in a holder case, and can be suitably used as a power source for a mounting-type power storage facility or as a backup power source for various battery devices.
  • SYMBOLS 100 Battery pack 1 ... Battery cell 2 ... Holder case 2X ... 1st case 2Y ... 2nd case 2A ... 1st surface 2B ... 2nd surface 2C ... 3rd surface 2D ... 4th surface 3 ... Positioning spacer 3A ... Insertion Hole 4 ... bus bar plate 4X ... first bus bar plate 4Y ... second bus bar plate 4a ... connecting piece 5 ... cover member 5X ... first cover member 5Y ... second cover member 6 ... temperature detector 7 ... discharge space DESCRIPTION OF SYMBOLS 8 ... Outer case 10 ... Battery pack 11 ... Outer can 12 ... Sealing plate 13 ... Electrode terminal 14 ...
  • Convex part electrode 20 ... Hollow part 21 ... Holding part 22 ... End surface plate part 23 ... Peripheral wall 23A ... Step recessed part 23a ... ... Inner peripheral wall 24 ... Connection hole 25 ... Storage recess 28 ... Step surface 29 ... Connection boss 32 ... Locking part 35 ... Opening part 36 ... Projection connection part 39 ... Connection screw 40 ... Through hole 41 ... Bending piece 42 ... External connection Part 3 ... bent piece 44 ... external connection part 45 ... lead plate 45A ... connection hole 46 ... connection piece 47 ... connection piece 48 ... fusing part 51 ... closing plate part 52 ... side wall part 52A ... cover side wall part 52B ... cover side wall part 52C ... excision part 54 ...

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

Abstract

The present invention quickly detects an abnormality due to ejecta, such as high-temperature gas or flames when igniting, that is ejected from a battery cell. This battery pack comprises: a plurality of battery cells that are obtained by blocking an opening section of an outer packaging canister with a sealing plate; a holder case that holds the plurality of battery cells in a mutually parallel arrangement; a pair of busbar plates that are positioned on top and bottom surfaces of the holder case; a cover member that is positioned to top and bottom outer sides of the holder case and covers the busbar plates; and a temperature detection unit that is positioned between the holder case and the cover member. A discharge space is formed between the cover member and the holder case, said discharge space allowing the influx of ejecta that is ejected from an end surface of a battery cell at the time of an abnormality in the battery cell. The periphery of the discharge space is blocked, the discharge space is provided with an opening section that brings one region of the periphery into communication with the exterior and allows the ejecta to pass through, and the temperature detection unit is positioned close to this opening section.

Description

電池パックBattery pack
　本発明は、複数の電池セルをホルダーケースの定位置に収納してなる電池パックに関し、とくに、電池パックに収納される電池セルの温度異常を検出する電池パックに関する。 The present invention relates to a battery pack in which a plurality of battery cells are housed in a fixed position of a holder case, and more particularly to a battery pack for detecting a temperature abnormality of a battery cell housed in the battery pack.
　近年、太陽光や風力等の自然エネルギーを利用した発電が注目されている。これ等の発電方法は、石油や石炭等の限りある化石燃料をエネルギーとして使用する発電方法に比べて、資源が枯渇しない再生可能エネルギーを使用する地球環境に優しいクリーンな発電方法として、さらなる導入、普及が期待されている。ただ、この種の発電では、発電量が昼夜の時間帯や天候等に作用されるという問題点がある。このため、安定した電力供給を実現するために、発電された電力を蓄電する設備の需要が高まってきている。また、再生可能エネルギーによる発電に限らず、火力発電や原子力発電等の発電においても、２４時間タービンを回して発電を継続する場合、深夜に発電された電力を、使用量が多くなる昼間に供給できるように蓄電する設備が求められている。 In recent years, power generation using natural energy such as sunlight and wind power has attracted attention. These power generation methods are further introduced as a clean environment-friendly power generation method that uses renewable energy that does not deplete resources compared to power generation methods that use limited fossil fuels such as oil and coal as energy. It is expected to spread. However, this type of power generation has a problem in that the amount of power generation is affected by daytime and nighttime, weather, and the like. For this reason, in order to implement | achieve stable electric power supply, the demand of the facility which stores the electric power generated is increasing. In addition to power generation using renewable energy, in power generation such as thermal power generation and nuclear power generation, when power generation is continued by turning the turbine for 24 hours, the power generated at midnight is supplied in the daytime when the amount of use increases. There is a need for equipment that can store electricity so that it can be used.
　このような蓄電装置として、繰り返し使用できるリチウムイオン二次電池やニッケル水素二次電池等の電池セルを多直列多並列に接続してなる電池パックを備える装置が採用されている。中でもリチウムイオン二次電池は、軽量でありながら、起電力が高く、高エネルギー密度であるため、近年では多用されている。電池パックは、多数の電池セルを直列に接続して出力電圧を高くでき、また並列に接続して出力電流を大きくできる。特に近年の大容量化の要求から、収納する電池セルの数が多くなる傾向にある。しかしながら、電池セルは大電流で充放電すると発熱するため、放熱性を確保することも重要となる。 As such a power storage device, a device including a battery pack in which battery cells such as a lithium ion secondary battery and a nickel hydride secondary battery that can be used repeatedly are connected in multiple series and in parallel is employed. Among them, lithium ion secondary batteries are frequently used in recent years because they are lightweight but have high electromotive force and high energy density. The battery pack can increase the output voltage by connecting a large number of battery cells in series, and can increase the output current by connecting them in parallel. In particular, due to the recent demand for large capacity, the number of battery cells to be stored tends to increase. However, since battery cells generate heat when charged and discharged with a large current, it is also important to ensure heat dissipation.
　とくに、電池セルは、異常が発生してさらに過熱されると、内部から高温のガスが噴出し、あるいは燃焼する火炎となって噴出されることがある。このような場合、複数の電池セルを接続している電池パックにおいては、一部の電池セルに異常が生じていても、他の電池セルが正常に機能することで、電池パックとして使用できる状態となることがある。このような場合、異常が生じた電池セルから隣接する電池セルに類焼が広がって、電池パック内での燃焼や発煙等がさらに拡大して危険な状態となることがある。このため、一部の電池に異常が生じたことを速やかに検出して保護する必要がある。 In particular, when an abnormality occurs and the battery cell is further overheated, high temperature gas may be ejected from the inside or may be ejected as a burning flame. In such a case, in a battery pack in which a plurality of battery cells are connected, even if some of the battery cells are abnormal, the other battery cells function normally and can be used as a battery pack. It may become. In such a case, similar burning spreads from the battery cell in which an abnormality has occurred to the adjacent battery cell, and combustion, smoke generation, and the like in the battery pack may further expand and become a dangerous state. For this reason, it is necessary to quickly detect and protect the abnormality of some batteries.
特開２０１３－１６５０１３号公報JP 2013-165013 A 特開２０１４－１３５２４７号公報JP 2014-135247 A
　本発明は、このような背景に鑑みてなされたものであり、その目的の一は、電池セルから噴出される高温のガスや発火時の火炎等の噴出体による異常を速やかに検出できる電池パックを提供することにある。 The present invention has been made in view of such a background, and one object of the present invention is a battery pack that can quickly detect abnormalities caused by ejected bodies such as high-temperature gas ejected from battery cells and flames at the time of ignition. Is to provide.
課題を解決するための手段及び発明の効果Means for Solving the Problems and Effects of the Invention
　上記の目的を達成するために、本発明の第１の形態に係る電池パックによれば、筒状で有底の外装缶１１の開口部を封口板１２で閉塞してなる複数の電池セル１と、複数の電池セル１を互いに平行な姿勢とし、かつ各電池セル１の両端に設けられた電極端子１３を同一面に配置する姿勢で保持するホルダーケース２と、ホルダーケース２の上下面に配置されて、電池セル１の電極端子１３が接続される一対のバスバープレート４と、ホルダーケース２の上下の外側に配置されて、バスバープレート４を被覆するカバー部材５と、ホルダーケース２とカバー部材５との間に配置されて、周囲温度を検出する温度検出部６とを備えている。カバー部材５とホルダーケース２との間には、電池セル１の異常時において、電池セル１の端面から噴出される噴出体を流入させる排出スペース７を形成している。排出スペース７は、周囲が閉塞されると共に、周囲の一部の領域を外部に連通させて、噴出物を通過させる開口部３５を設けており、この開口部３５に接近して温度検出部６を配置している。 In order to achieve the above object, according to the battery pack of the first embodiment of the present invention, a plurality of battery cells 1 formed by closing the opening of a cylindrical, bottomed outer can 11 with a sealing plate 12. A holder case 2 for holding the plurality of battery cells 1 in a posture parallel to each other and holding the electrode terminals 13 provided at both ends of each battery cell 1 on the same surface; A pair of bus bar plates 4 disposed to which the electrode terminals 13 of the battery cells 1 are connected, a cover member 5 disposed on the upper and lower sides of the holder case 2 to cover the bus bar plate 4, the holder case 2 and the cover A temperature detection unit 6 that is disposed between the member 5 and detects the ambient temperature is provided. Between the cover member 5 and the holder case 2, a discharge space 7 is formed in which the ejected body ejected from the end surface of the battery cell 1 flows in when the battery cell 1 is abnormal. The discharge space 7 is closed at the periphery, and is provided with an opening 35 that allows a part of the surrounding area to communicate with the outside and allow the ejected matter to pass through. The temperature detection unit 6 approaches the opening 35. Is arranged.
　上記構成により、ホルダーケースに収納される電池セルに異常が発生した際に、電池セルの端面から噴出される噴出体を確実に温度検出部に通過させて温度異常を検出できる。それは、この電池パックが、ホルダーケースとカバー部材の間に電池セルからの噴出体を流入させる排出スペースを備えており、この排出スペースは、閉塞された周囲の一部を外部に連通して開口部を設けると共に、この開口部に温度検出部を配置しているからである。 With the above configuration, when an abnormality occurs in the battery cell stored in the holder case, the temperature abnormality can be detected by reliably passing the ejected body ejected from the end surface of the battery cell to the temperature detection unit. The battery pack has a discharge space for allowing the ejector from the battery cell to flow between the holder case and the cover member, and the discharge space is opened by communicating a part of the closed periphery to the outside. This is because the temperature detection unit is disposed in the opening.
　本発明の第２の形態に係る電池パックによれば、ホルダーケース２が、第１ケース２Ｘと第２ケース２Ｙに分割されており、第１ケース２Ｘ及び第２ケース２Ｙは、電池セル１の端面が内側に配置される端面プレート部２２と、端面プレート部２２の周囲に沿って形成された周壁２３とを備えることができる。第１ケース２Ｘ及び第２ケース２Ｙは、端面プレート部２２の外側面にバスバープレート４を配置する収納凹部２５を形成すると共に、収納凹部２５をカバー部材５で閉塞して排出スペース７を形成することができる。 According to the battery pack of the second aspect of the present invention, the holder case 2 is divided into the first case 2X and the second case 2Y, and the first case 2X and the second case 2Y The end surface plate part 22 by which an end surface is arrange | positioned inside can be provided, and the surrounding wall 23 formed along the circumference | surroundings of the end surface plate part 22 can be provided. The first case 2 </ b> X and the second case 2 </ b> Y form a storage recess 25 in which the bus bar plate 4 is disposed on the outer surface of the end surface plate part 22, and close the storage recess 25 with the cover member 5 to form a discharge space 7. be able to.
　上記構成によると、第１ケース及び第２ケースを、電池セルの端面が内側に配置される端面プレート部とこの端面プレート部の周囲に沿って形成された周壁とで構成し、端面プレート部の外側面に形成されたバスバープレートを配置する収納凹部をカバー部材で閉塞することで排出スペースを簡単に形成することができる。この構造は、バスバープレートを配置する収納凹部を排出スペースに兼用し、また、バスバープレートを被覆するカバー部材を排出スペースを形成する部材に兼用するので、排出スペースを省スペースに配置しながら製造コストを低減できる。 According to the said structure, a 1st case and a 2nd case are comprised with the end surface plate part by which the end surface of a battery cell is arrange | positioned inside, and the surrounding wall formed along the circumference | surroundings of this end surface plate part, By closing the housing recess where the bus bar plate formed on the outer surface is disposed with a cover member, a discharge space can be easily formed. In this structure, the storage recess where the bus bar plate is placed is also used as the discharge space, and the cover member that covers the bus bar plate is also used as the member that forms the discharge space. Can be reduced.
　本発明の第３の形態に係る電池パックによれば、複数の電池セル１を同じ向きに並べてホルダーケース２に収納すると共に、第１ケース２Ｘ及び第２ケース２Ｙには、端面プレート部２２を貫通する接続孔２４を開口して、接続孔２４から電池セル１の電極端子１３を露出させて、電極端子１３をバスバープレート４に接続して複数の電池セル１を並列に接続することができる。 According to the battery pack of the third embodiment of the present invention, the plurality of battery cells 1 are arranged in the same direction and stored in the holder case 2, and the end face plate portion 22 is provided in the first case 2X and the second case 2Y. A plurality of battery cells 1 can be connected in parallel by opening the connection hole 24 penetrating, exposing the electrode terminal 13 of the battery cell 1 from the connection hole 24, and connecting the electrode terminal 13 to the bus bar plate 4. .
　上記構成により、複数の電池セルを同じ向きに並べてホルダーケースに収納し、第１ケース及び第２ケースの端面プレート部に開口された接続孔から電池セルの電極端子を露出させ、この電極端子をバスバープレートに接続することで複数の電池セルを簡単に並列接続できる。 With the above configuration, a plurality of battery cells are arranged in the same direction and stored in the holder case, and the electrode terminals of the battery cells are exposed from the connection holes opened in the end face plate portions of the first case and the second case. A plurality of battery cells can be easily connected in parallel by connecting to the bus bar plate.
　さらに、第４の形態に係る電池パックによれば、ホルダーケース２を熱硬化性樹脂で成形することができる。上記構成により、ホルダーケースを熱硬化性樹脂で成形することで、優れた耐熱性と耐薬品性を実現できる。 Furthermore, according to the battery pack according to the fourth embodiment, the holder case 2 can be formed of a thermosetting resin. With the above configuration, the holder case is formed of a thermosetting resin, thereby realizing excellent heat resistance and chemical resistance.
　本発明の第５の形態に係る電池パックによれば、電池セル１の封口板１２を設けた端部と対向する排出スペース７に開口部３５を形成することができる。上記構成により、電池セルの異常時において、高温のガスや火炎等の噴出体が排出されやすい封口板側の端部と対向する排出スペースに開口部を形成するので、電池セルの異常を効率よく検出できる。 According to the battery pack of the fifth embodiment of the present invention, the opening 35 can be formed in the discharge space 7 facing the end portion of the battery cell 1 where the sealing plate 12 is provided. With the above configuration, when the battery cell is abnormal, an opening is formed in the discharge space facing the end on the side of the sealing plate where the ejected body such as high-temperature gas or flame is easily discharged. It can be detected.
　本発明の第６の形態に係る電池パックによれば、温度検出部６を温度ヒューズとして、一端をバスバープレート４に接続すると共に、他端をリード線７６を介して外部に接続することができる。上記構成によると、電池セルのいずれかに異常が生じて高温のガスや火炎等が排出されると温度ヒューズが溶断されてリード線による電池電圧の検出ができなくなるので、電池電圧の検出の可否により、電池セルの異常を検出できる。 According to the battery pack of the sixth aspect of the present invention, the temperature detector 6 can be used as a thermal fuse, and one end can be connected to the bus bar plate 4 and the other end can be connected to the outside via the lead wire 76. . According to the above configuration, if any of the battery cells becomes abnormal and high-temperature gas or flame is discharged, the thermal fuse is blown and the battery voltage cannot be detected by the lead wire. Thus, abnormality of the battery cell can be detected.
本発明の一実施の形態にかかる電池パックの斜視図である。It is a perspective view of the battery pack concerning one embodiment of the present invention. 図１に示す電池パックのＩＩ－ＩＩ線断面図である。FIG. 2 is a sectional view taken along line II-II of the battery pack shown in FIG. 図１に示す電池パックのＩＩＩ－ＩＩＩ線断面図である。FIG. 3 is a cross-sectional view of the battery pack shown in FIG. 1 taken along the line III-III. 図１に示す電池パックの分解斜視図である。It is a disassembled perspective view of the battery pack shown in FIG. 図４に示す電池パックを下側から見た分解斜視図である。It is the disassembled perspective view which looked at the battery pack shown in FIG. 4 from the lower side. 図４に示す電池パックのホルダーケースの分解斜視図である。It is a disassembled perspective view of the holder case of the battery pack shown in FIG. ホルダーケースの他の一例を示す分解斜視図である。It is a disassembled perspective view which shows another example of a holder case. 第１のバスバープレートの一部拡大分解斜視図である。FIG. 3 is a partially enlarged exploded perspective view of a first bus bar plate. 第２のバスバープレートの一部拡大分解斜視図である。It is a partial expansion exploded perspective view of the 2nd bus bar plate. バスバープレートと電池セルの接続工程を示す要部拡大断面図である。It is a principal part expanded sectional view which shows the connection process of a bus-bar plate and a battery cell. 複数の電池パックを接続してなるバッテリパックの内部構造を示す概略平面図である。It is a schematic plan view which shows the internal structure of the battery pack formed by connecting a plurality of battery packs.
　以下、本発明の実施形態を図面に基づいて説明する。ただし、以下に示す実施形態は、本発明の技術思想を具体化するための電池パックを例示するものであって、本発明は電池パックを以下のものに特定しない。また、本明細書は、特許請求の範囲に示される部材を、実施形態の部材に特定するものでは決してない。特に実施形態に記載されている構成部品の寸法、材質、形状、その相対的配置等は特に特定的な記載がない限りは、本発明の範囲をそれのみに限定する趣旨ではなく、単なる説明例にすぎない。さらに以下の説明において、同一の名称、符号については同一若しくは同質の部材を示しており、詳細説明を適宜省略する。さらに、本発明を構成する各要素は、複数の要素を同一の部材で構成して一の部材で複数の要素を兼用する態様としてもよいし、逆に一の部材の機能を複数の部材で分担して実現することもできる。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the embodiment described below exemplifies a battery pack for embodying the technical idea of the present invention, and the present invention does not specify the battery pack as follows. Moreover, this specification does not specify the member shown by the claim as the member of embodiment by any means. In particular, the dimensions, materials, shapes, relative arrangements, and the like of the component parts described in the embodiments are not intended to limit the scope of the present invention only to specific examples unless otherwise specifically described. Only. Furthermore, in the following description, the same name and reference sign indicate the same or the same members, and detailed description will be omitted as appropriate. Furthermore, each element constituting the present invention may be configured such that a plurality of elements are configured by the same member and the plurality of elements are shared by one member. It can also be realized by sharing.
　本発明の電池パックは、載置型の蓄電用設備の電源として利用でき、例えば発電所や発電施設用、工場用、公共施設用の蓄電装置として、太陽光発電や風力発電で充電し、あるいは深夜電力で充電して、必要時に放電する蓄電装置に適用できる。このような用途においては、複数の電池パックを連結して、これらを直列及び／又は並列に接続して出力を大きくして蓄電装置を構成できる。蓄電装置は、複数の電池パックを数珠繋ぎに接続して、終端にコントローラを接続して、各電池パックの充放電を制御することができる。ただし、本発明の電池パックは、このような蓄電用設備の電源に限らず、日中の太陽光を充電して夜間に放電する街路灯用の電源や、停電時に駆動する信号機やコンピュータサーバ用のバックアップ電源、携帯電話等の無線基地局用のバックアップ電源装置等にも利用可能であることはいうまでもない。 The battery pack of the present invention can be used as a power source for a stationary power storage facility. For example, as a power storage device for a power plant, power generation facility, factory, or public facility, the battery pack is charged by solar power generation or wind power generation, or at midnight. It can be applied to a power storage device that is charged with electric power and discharged when necessary. In such an application, a plurality of battery packs can be connected and connected in series and / or in parallel to increase the output to constitute a power storage device. The power storage device can control charging / discharging of each battery pack by connecting a plurality of battery packs in a daisy chain and connecting a controller to the terminal end. However, the battery pack of the present invention is not limited to such a power source for power storage facilities, but is also used for a street light power source that charges sunlight during the day and discharges it at night, a traffic light that is driven during a power failure, and a computer server Needless to say, the present invention can also be used for a backup power supply for a wireless base station such as a mobile phone or a mobile phone.
　図１～図６に、本発明の一実施形態に係る電池パックを示している。これらの図において、図１は電池パックの斜視図、図２は図１の電池パックのＩＩ－ＩＩ線断面図、図３は図１の電池パックのＩＩＩ－ＩＩＩ線断面図、図４は図１の電池パックの分解斜視図、図５は図４の電池パックを下側から見た分解斜視図、図６はホルダーケースの分解斜視図をそれぞれ示している。 1 to 6 show a battery pack according to an embodiment of the present invention. In these drawings, FIG. 1 is a perspective view of the battery pack, FIG. 2 is a cross-sectional view taken along line II-II of the battery pack of FIG. 1, FIG. 3 is a cross-sectional view taken along line III-III of FIG. 1 is an exploded perspective view of the battery pack 1, FIG. 5 is an exploded perspective view of the battery pack of FIG. 4 viewed from below, and FIG. 6 is an exploded perspective view of the holder case.
　これ等の図に示す電池パック１０は、筒状で有底の外装缶１１の開口部を封口板１２で閉塞してなる複数の電池セル１と、複数の電池セル１１を互いに平行な姿勢とし、かつ各電池セル１の両端に設けられた電極端子１３を同一面に配置する姿勢で保持するホルダーケース２と、ホルダーケース２の上下面に配置されて、電池セル１の電極端子１３が接続される一対のバスバープレート４と、ホルダーケース２の上下の外側に配置されて、バスバープレート４を被覆するカバー部材５と、ホルダーケース２とカバー部材５との間に配置されて、周囲温度を検出する温度検出部６とを備えている。電池パック１０は、カバー部材５とホルダーケース２との間に、電池セル１の異常時において、電池セル１の端面から噴出される噴出体を流入させる排出スペース７を形成している。排出スペース７は、周囲が閉塞されると共に、周囲の一部の領域を外部に連通させて、噴出物を通過させる開口部３５を設けており、この開口部３５に接近して温度検出部６を配置している。 The battery pack 10 shown in these drawings includes a plurality of battery cells 1 in which openings of a cylindrical and bottomed outer can 11 are closed with a sealing plate 12, and a plurality of battery cells 11 are parallel to each other. In addition, the holder terminal 2 that holds the electrode terminals 13 provided at both ends of each battery cell 1 in the same plane and the upper and lower surfaces of the holder case 2 are connected to the electrode terminals 13 of the battery cell 1. A pair of bus bar plates 4 arranged on the upper and lower outer sides of the holder case 2 and disposed between the cover member 5 covering the bus bar plate 4 and the holder case 2 and the cover member 5, the ambient temperature is reduced. And a temperature detection unit 6 for detection. In the battery pack 10, a discharge space 7 is formed between the cover member 5 and the holder case 2 to allow the ejected body ejected from the end face of the battery cell 1 to flow when the battery cell 1 is abnormal. The discharge space 7 is closed at the periphery, and is provided with an opening 35 that allows a part of the surrounding area to communicate with the outside and allow the ejected matter to pass through. The temperature detection unit 6 approaches the opening 35. Is arranged.
（電池セル１）
　電池セル１は、充放電できるリチウムイオン二次電池である。ただ、電池セルは、リチウムイオン二次電池に限定されず、ニッケル水素電池やニッケルカドミウム電池等の充放電できる電池であってもよい。さらに、本実施例の電池パックでは、円筒形電池が使用されているが、これに限定されず、角形電池や扁平形電池とすることもできる。 (Battery cell 1)
The battery cell 1 is a lithium ion secondary battery that can be charged and discharged. However, the battery cell is not limited to a lithium ion secondary battery, and may be a battery that can be charged and discharged, such as a nickel metal hydride battery or a nickel cadmium battery. Furthermore, in the battery pack of the present embodiment, a cylindrical battery is used. However, the present invention is not limited to this, and a square battery or a flat battery may be used.
　電池セル１は、図６の一部拡大図に示すように、筒状で有底の外装缶１１に電極体（図示せず）を収納すると共に、電解液を充填して外装缶１１の開口部を封口板１２で閉塞している。電池セル１は、両端面である外装缶１１の底面と、この外装缶１１の開口部に絶縁状態で閉塞された封口板１２とを正負の電極端子１３としている。 As shown in a partially enlarged view of FIG. 6, the battery cell 1 stores an electrode body (not shown) in a cylindrical and bottomed outer can 11 and is filled with an electrolyte solution to open the outer can 11. The part is closed with a sealing plate 12. The battery cell 1 uses the bottom surface of the outer can 11 as both end surfaces and the sealing plate 12 closed in an insulating state at the opening of the outer can 11 as positive and negative electrode terminals 13.
　図６に示す電池セル１は、外装缶１１を鉄または鉄合金として強度を高くすると共に、封口板１２には凸部電極を設けることなく、中央凹となる円板形状に形成された金属板を使用している。このような封口板１２として、アルミニウム又はアルミニウム合金が使用できる。この構造の電池セル１は、鉄製の外装缶１１に対してアルミニウム製の封口板１２の強度を低くすることができるこのため、過充電や内部短絡等により、内圧が異常に高くなる等の問題が生じた際には、アルミニウム製の封口板１２を優先的に開放させて、内部のガス等を速やかに外部に排出して安全性を保証することができる。 The battery cell 1 shown in FIG. 6 has a metal plate formed in a disk shape having a central recess without providing a convex electrode on the sealing plate 12 while increasing the strength by using the outer can 11 as iron or an iron alloy. Is used. As such a sealing plate 12, aluminum or an aluminum alloy can be used. The battery cell 1 having this structure can lower the strength of the aluminum sealing plate 12 relative to the iron outer can 11, so that the internal pressure becomes abnormally high due to overcharge or internal short circuit. When this occurs, the aluminum sealing plate 12 can be opened preferentially, and the internal gas or the like can be quickly discharged to the outside to ensure safety.
　ただ、電池セルは、図７に示すように、封口板１２に凸部電極１４を設けた構造とすることもできる。この電池セル７１は、封口板１２や凸部電極１４に安全弁（図示せず）を設けて、電池セル７１の内圧が上昇すると、安全弁を開弁して内部のガスを外部に排気することができる。 However, as shown in FIG. 7, the battery cell may have a structure in which a protruding electrode 14 is provided on a sealing plate 12. In the battery cell 71, a safety valve (not shown) is provided on the sealing plate 12 or the convex electrode 14, and when the internal pressure of the battery cell 71 rises, the safety valve is opened and the internal gas can be exhausted to the outside. it can.
（ホルダーケース２）
　図２、図３、及び図６に示すホルダーケース２は、複数の電池セル１を互いに平行な姿勢で収納している。複数の電池セル１は、同じ向きとなるように配置されている。すなわち、図においては、外装缶１１の底側の端部が下方となり、封口板１２で閉塞された端部側が上方となる姿勢で配置されている。ホルダーケース２は、各電池セル１の両端に設けられた電極端子１３を同一面に配置する姿勢で定位置に保持している。 (Holder case 2)
The holder case 2 shown in FIGS. 2, 3, and 6 accommodates a plurality of battery cells 1 in a parallel posture. The plurality of battery cells 1 are arranged in the same direction. That is, in the figure, the bottom end of the outer can 11 is positioned downward, and the end closed by the sealing plate 12 is positioned upward. The holder case 2 holds the electrode terminals 13 provided at both ends of each battery cell 1 at a fixed position in a posture where they are arranged on the same surface.
　ホルダーケース２は、図６に示すように、電池セル１の長手方向であって、厚さ方向の中間において、第１ケース２Ｘと第２ケース２Ｙに二分割されている。第１ケース２Ｘと第２ケース２Ｙは、それぞれ円筒状の電池セル１の端部を個別に挿入して保持するための保持部２１を内側に設けている。第１ケース２Ｘと第２ケース２Ｙは、電池セル１の端部を挿入する複数の保持部２１を内側面に設けた端面プレート部２２と、端面プレート部２２の周囲に沿って形成された周壁２３とを備えている。第１ケース２Ｘと第２ケース２Ｙは、全体の外形を略矩形状として、周壁２３の対向する開口縁を互いに連結している。 As shown in FIG. 6, the holder case 2 is divided into a first case 2X and a second case 2Y in the longitudinal direction of the battery cell 1 and in the middle of the thickness direction. The first case 2X and the second case 2Y are each provided with a holding portion 21 for inserting and holding the end of the cylindrical battery cell 1 individually. The first case 2 </ b> X and the second case 2 </ b> Y include an end surface plate portion 22 provided with a plurality of holding portions 21 into which end portions of the battery cell 1 are inserted on the inner surface, and a peripheral wall formed along the periphery of the end surface plate portion 22. 23. The first case 2 </ b> X and the second case 2 </ b> Y have an overall outer shape of a substantially rectangular shape, and the opposing opening edges of the peripheral wall 23 are connected to each other.
（保持部２１）
　保持部２１は、電池セル１の端部を挿入して保持できる形状に形成されている。図に示す保持部２１は、電池セル１の外周面に沿う形状であって、好ましくは電池セル１の外周面に接近ないし接触して、電池セル１の外周面との間を隙間なくできる形状の凹部として端面プレート部２２の内側に複数設けている。複数の保持部２１は、ここに挿入される電池セル１を端面プレート部２２に対して略垂直姿勢で保持できるように形成されている。ここでは、電池セル１は円筒形二次電池を使用しているため、円筒形の電池セル１を収納できるように、ホルダーケース２は、内部を円柱状とする保持部２１を形成している。これ等の保持部２１は、図６の分解斜視図に示すように、第１ケース２Ｘと第２ケース２Ｙとを電池セル１の両側から挟み込むように接合することで、複数の電池セル１をホルダーケース２の内部の定位置に収納可能としている。ただ、保持部は、電池セルの外形に沿う形状の内形を有する筒部とし、この筒部を複数並べることもできる。 (Holding part 21)
The holding | maintenance part 21 is formed in the shape which can insert and hold | maintain the edge part of the battery cell 1. FIG. The holding portion 21 shown in the figure has a shape that follows the outer peripheral surface of the battery cell 1 and preferably has a shape that allows the outer peripheral surface of the battery cell 1 to approach or contact the outer peripheral surface of the battery cell 1 without a gap. A plurality of recesses are provided inside the end face plate portion 22. The plurality of holding portions 21 are formed so that the battery cell 1 inserted therein can be held in a substantially vertical posture with respect to the end face plate portion 22. Here, since the battery cell 1 uses a cylindrical secondary battery, the holder case 2 forms a holding portion 21 having an inner cylindrical shape so that the cylindrical battery cell 1 can be accommodated. . As shown in the exploded perspective view of FIG. 6, these holding portions 21 join the first case 2 </ b> X and the second case 2 </ b> Y so as to sandwich the battery cell 1 from both sides, thereby connecting the plurality of battery cells 1. The holder case 2 can be stored in a fixed position. However, the holding portion is a cylindrical portion having an inner shape that follows the outer shape of the battery cell, and a plurality of the cylindrical portions can be arranged.
　複数の保持部２１は、第１ケース２Ｘ及び第２ケース２Ｙの内側にそれぞれ所定の配列で設けられている。ホルダーケース２に形成される保持部２１の数は、収納する電池セル１の本数によって決定される。本実施例においては、ホルダーケース２は、第１ケース２Ｘ及び第２ケース２Ｙにそれぞれ７６個の保持部２１を設けている。図６に示すホルダーケース２の保持部２１は、第１面２Ａから第３面２Ｃに向かって９列に並べて形成されると共に、各列においては、第２面２Ｂから第４面２Ｄに向かって８～９個を等間隔で直線状に並べて、全体で７６個の保持部２１を設けている。また、多列にわたって形成される保持部２１は、隣接する列間では、ひとつの列内で隣り合う電池セル１の間に隣の列の電池セル１が位置するように、すなわち千鳥配列の状態で電池セル１を配置できるようにしている。ここで、図６に示すホルダーケース２は、７６個の保持部２１に電池セル１を収納している。 The plurality of holding portions 21 are provided in a predetermined arrangement inside the first case 2X and the second case 2Y, respectively. The number of holding parts 21 formed in the holder case 2 is determined by the number of battery cells 1 to be stored. In the present embodiment, the holder case 2 is provided with 76 holding portions 21 in the first case 2X and the second case 2Y, respectively. The holding portions 21 of the holder case 2 shown in FIG. 6 are formed in nine rows from the first surface 2A to the third surface 2C, and in each row, the holding portions 21 are directed from the second surface 2B to the fourth surface 2D. A total of 76 holding portions 21 are provided by arranging 8-9 pieces in a straight line at equal intervals. In addition, the holding portions 21 formed over multiple rows are arranged so that the adjacent battery cells 1 are located between adjacent battery cells 1 in one row, that is, in a staggered state. Thus, the battery cell 1 can be arranged. Here, in the holder case 2 shown in FIG. 6, the battery cell 1 is accommodated in 76 holding portions 21.
　凹部形状に形成された保持部２１の深さは、電池セル１の長さの５～３０％、好ましくは１０～２５％、さらに好ましくは、１５～２５％とする。さらに、第１ケース２Ｘと第２ケース２Ｙとで、電池セル１を両側から挟み込むように接合することで、２つの保持部２１で電池セル１の両端部分を収納して保持すると共に、電池セル１の中間部分をホルダーケース２の内部に表出させて、ホルダーケース２の内部に、電池セルの中間部分を表出させる中空部２０を形成している。これにより、電池セル１の中間部分が隣接する各電池セルの間が離間できるため、電池セルの冷却効果を向上させることができる。 The depth of the holding portion 21 formed in the concave shape is 5 to 30%, preferably 10 to 25%, more preferably 15 to 25% of the length of the battery cell 1. Furthermore, by joining the first case 2X and the second case 2Y so as to sandwich the battery cell 1 from both sides, the two holding portions 21 store and hold both ends of the battery cell 1, and the battery cell. A hollow portion 20 is formed in the holder case 2 so that the intermediate portion of the battery cell is exposed in the holder case 2. Thereby, since each battery cell which the intermediate part of the battery cell 1 adjoins can be spaced apart, the cooling effect of a battery cell can be improved.
　さらに、第１ケース２Ｘ及び第２ケース２Ｙは、保持部２１の底面を貫通する接続孔２４を端面プレート部２２に開口している。この端面プレート部２２は、内側に設けた保持部２１に電池セル１の端部を挿入する状態で、外側面に開口された接続孔２４から電極端子１３を露出させている。さらに、接続孔２４は、図２と図３に示すように、保持部２１に挿入される電池セル１の外装缶１１の外形よりも小さくして、電池セル１の通過を阻止する構造としている。これにより、保持部２１に挿入される電池セル１の端部を端面プレート部２２に貫通させることなく接続孔２４の定位置で停止できるようにしている。端面プレート部２２の接続孔２４から露出される電池セル１の電極端子１３は、詳細には後述するが、端面プレート部２２の外側に配置されるバスバープレート４に接続される。 Furthermore, in the first case 2X and the second case 2Y, a connection hole 24 penetrating the bottom surface of the holding portion 21 is opened in the end face plate portion 22. The end surface plate portion 22 exposes the electrode terminal 13 from the connection hole 24 opened on the outer surface in a state where the end portion of the battery cell 1 is inserted into the holding portion 21 provided inside. Further, as shown in FIGS. 2 and 3, the connection hole 24 is made smaller than the outer shape of the outer can 11 of the battery cell 1 inserted into the holding portion 21 so as to prevent passage of the battery cell 1. . Thus, the end portion of the battery cell 1 inserted into the holding portion 21 can be stopped at a fixed position of the connection hole 24 without penetrating the end face plate portion 22. The electrode terminal 13 of the battery cell 1 exposed from the connection hole 24 of the end face plate portion 22 is connected to the bus bar plate 4 disposed outside the end face plate portion 22 as will be described in detail later.
　図４～図６に示す第１ケース２Ｘ及び第２ケース２Ｙは、端面プレート部２２の外側面に、バスバープレート４を配置する収納凹部２５を形成している。図に示す第１ケース２Ｘ及び第２ケース２Ｙは、端面プレート部２２の周囲に設けた周壁２３を端面プレート部２２の外側にも突出させており、この突出部と端面プレート部２２とで形成される凹部を収納凹部２５としてバスバープレート４の収納スペースとしている。図に示すホルダーケース２は、収納凹部２５にバスバープレート４を配置すると共に、この収納凹部２５の外側をカバー部材５で閉塞している。カバー部材５は、閉塞プレート部５１の周囲に沿って側壁部５２を備えており、この側壁部５２をホルダーケース２の外側に突出する周壁２３に連結してカバー部材５の周囲を閉塞している。 The first case 2X and the second case 2Y shown in FIG. 4 to FIG. 6 have a storage recess 25 in which the bus bar plate 4 is disposed on the outer surface of the end face plate portion 22. The first case 2 </ b> X and the second case 2 </ b> Y shown in the drawing have a peripheral wall 23 provided around the end face plate part 22 protruding outside the end face plate part 22, and are formed by the protruding part and the end face plate part 22. The recessed portion to be stored is used as a storage recess 25 to store the bus bar plate 4. In the holder case 2 shown in the figure, the bus bar plate 4 is disposed in the storage recess 25 and the outside of the storage recess 25 is closed by the cover member 5. The cover member 5 includes a side wall portion 52 along the periphery of the closing plate portion 51, and the side wall portion 52 is connected to the peripheral wall 23 protruding to the outside of the holder case 2 to close the periphery of the cover member 5. Yes.
　さらに、ホルダーケース２は、図示しないが、側面である周壁２３に通気口を開口することもできる。これによりホルダーケース２の内外において換気がなされて、ホルダーケース２に収納される電池セル１の放熱特性をさらに向上できる。 Furthermore, although not shown, the holder case 2 can also have a vent opening in the peripheral wall 23 that is the side surface. Thereby, ventilation is made inside and outside the holder case 2, and the heat dissipation characteristics of the battery cell 1 stored in the holder case 2 can be further improved.
（成形樹脂）
　このような第１ケース２Ｘと第２ケース２Ｙは、それぞれ金型を使用した射出成形により形成される。ホルダーケース２は、絶縁性に優れた部材、好適には樹脂で構成される。このような樹脂として、ＰＣ（ポリカーボネート）やＰＰ（ポリプロピレン）、ＰＢＴ等の熱可塑性樹脂や、不飽和フェノール樹脂や不飽和ポリエステル等の熱硬化性樹脂が使用できる。なお、熱硬化性樹脂の場合、圧縮成形や射出圧縮成形により形成される。 (Molded resin)
The first case 2X and the second case 2Y are formed by injection molding using a mold. The holder case 2 is made of a member having excellent insulating properties, preferably a resin. As such a resin, thermoplastic resins such as PC (polycarbonate), PP (polypropylene), and PBT, and thermosetting resins such as unsaturated phenol resins and unsaturated polyesters can be used. In the case of a thermosetting resin, it is formed by compression molding or injection compression molding.
　ホルダーケースを熱可塑性樹脂で成形する構造は、金型を使用した射出成形を簡単にできると共に、安価である熱可塑性樹脂を使用することで製造コストを低減できる。ただ、ホルダーケースは、電池セルの異常時に高温に加熱される虞があるので、使用する電池セルの容量や本数、使用環境、要求される耐熱性能に応じて、熱可塑性樹脂で製造することができる。 The structure in which the holder case is molded with a thermoplastic resin can simplify the injection molding using a mold, and can reduce the manufacturing cost by using an inexpensive thermoplastic resin. However, since the holder case may be heated to a high temperature when the battery cell is abnormal, it can be manufactured from a thermoplastic resin according to the capacity and number of battery cells used, the usage environment, and the required heat resistance. it can.
　これに対して、ホルダーケース２を熱硬化性樹脂で成形する構造は、金型を使用した成形時において、溶融樹脂を金型に注入する時間が長くなると共に、注入後において加熱して硬化させる工程を要するため、短時間で効率よく多量生産できない問題点と、高価である熱硬化性樹脂を使用することで製造コストが高騰する問題点があった。しかしながら、以上の電池パックでは、ホルダーケース２を構成する第１ケース２Ｘと第２ケース２Ｙの間に位置決スペーサー３を介在させることにより複数の電池セル１を定位置に配置するので、第１ケース２Ｘ及び第２ケース２Ｙに形成される保持部２１を浅くしても、電池セルの両端部を両側から挟み込みながら保持部２１で保持することが可能となる。すなわち、電池セル１の端部を挿入する保持部２１を浅く形成することで、金型を簡単な構造としつつ、使用する樹脂の量を低減して、製造時間を短縮しながら製造コストを低減でき、多量生産することが可能となる。また、熱硬化性樹脂製のホルダーケースは、優れた耐熱性を有するので、前述のように、電池セルに以上が生じた際に発火や発煙により高温に加熱されることがあっても、溶融されることなく隣接する電池セルへの類焼が有効に防止される。また、熱硬化性樹脂は耐薬品性にも優れているため、電池セルから排出される電解液等による弊害も防止できる。以上のような観点から、ここでは、ホルダーケースを製造する樹脂として、好ましくは熱硬化性樹脂を使用する。 In contrast, the structure in which the holder case 2 is molded with a thermosetting resin increases the time for injecting the molten resin into the mold during molding using the mold, and is heated and cured after the injection. Since a process is required, there is a problem that mass production cannot be efficiently performed in a short time, and a problem that the manufacturing cost is increased by using an expensive thermosetting resin. However, in the above battery pack, the plurality of battery cells 1 are arranged at fixed positions by interposing the positioning spacer 3 between the first case 2X and the second case 2Y constituting the holder case 2, so that the first Even if the holding portions 21 formed in the case 2X and the second case 2Y are shallow, it is possible to hold the battery cells with the holding portions 21 while sandwiching both end portions from both sides. That is, by forming the holding portion 21 into which the end of the battery cell 1 is inserted shallow, the amount of resin to be used is reduced while reducing the manufacturing cost while making the mold simple structure. Can be mass-produced. In addition, since the holder case made of thermosetting resin has excellent heat resistance, as described above, even if it is heated to high temperature due to ignition or smoke when the above occurs, it will melt Thus, similar firing to adjacent battery cells is effectively prevented. Moreover, since the thermosetting resin is also excellent in chemical resistance, it is possible to prevent adverse effects caused by the electrolyte solution discharged from the battery cell. From the above viewpoint, here, a thermosetting resin is preferably used as the resin for manufacturing the holder case.
（位置決スペーサー）
　位置決スペーサー３は、第１ケース２Ｘの保持部２１と第２ケース２Ｙの保持部２１との間に配置されて、複数の電池セル１の中間部を保持して、これ等の電池セル１の位置を特定する。図６に示す位置決スペーサー３は、電池セル１を貫通させて、電池セル１の中間部を保持する挿通孔３Ａを複数開口してなる多孔プレートとしている。位置決スペーサー３に開口される挿通孔３Ａは、上下に配置される第１ケース２Ｘ及び第２ケース２Ｙの保持部２１と対向する位置に設けられている。さらに、挿通孔３Ａは、電池セル１の外周面に接触する内形としており、電池セル１の中間部を定位置に保持できるようにしている。この位置決スペーサー３は、挿通孔３Ａに挿入される電池セル１の中間部を保持することで、電池セル１をホルダーケース２内の定位置に位置決めできるようにしている。 (Positioning spacer)
The positioning spacer 3 is disposed between the holding part 21 of the first case 2X and the holding part 21 of the second case 2Y, holds the intermediate part of the plurality of battery cells 1, and these battery cells 1 Specify the position of. The positioning spacer 3 shown in FIG. 6 is a perforated plate having a plurality of insertion holes 3 </ b> A that penetrate the battery cell 1 and hold the middle part of the battery cell 1. 3 A of insertion holes opened by the positioning spacer 3 are provided in the position facing the holding | maintenance part 21 of 1st case 2X and 2nd case 2Y arrange | positioned up and down. Further, the insertion hole 3 </ b> A has an inner shape that comes into contact with the outer peripheral surface of the battery cell 1, so that an intermediate portion of the battery cell 1 can be held at a fixed position. The positioning spacer 3 holds the middle part of the battery cell 1 inserted into the insertion hole 3 </ b> A so that the battery cell 1 can be positioned at a fixed position in the holder case 2.
　以上の電池パック１０は、複数の電池セル１を位置決スペーサー３で位置決めしながら、第１ケース２Ｘと第２ケース２Ｙとで電池セル１の両端部を両側から挟み込むように保持することで、多数の電池セル１を位置決めしながら簡単に対向する保持部２１に挿入することができる。例えば、第１ケース２Ｘの開口部に位置決スペーサー３を配置した状態で、位置決スペーサー３の挿通孔３Ａに電池セル１を挿通し、挿入側の端部を第１ケース２Ｘの保持部２１に挿入することで、電池セル１を位置決めしながら第１ケース２Ｘに配置できる。この状態で、第１ケース２Ｘに配置された多数の電池セル１は、下端が第１ケース２Ｘの保持部２１に挿入されると共に、中間部が位置決スペーサー３の挿通孔３Ａで位置決めされるので、上側の端部が前後左右に移動することなく、第２ケース２Ｙの保持部２１に挿入されにくくなる自体を解消できる。すなわち、第１ケース２Ｘに配置された多数の電池セル１は、中間部が位置決スペーサー３によって定位置に保持されることで、上側の端部の位置が位置決めされて、第２ケース２Ｙを上から被せる状態で確実に電池セル１の上側端部を第２ケース２Ｙの保持部２１に挿入できる。この構造は、実質的には、電池セル１の約半分の長さを収納する電池収納部と同じ状態で電池セルを位置決めしながら保持できる。したがって、反対側の端部を速やかに対向する保持部に挿入して、電池セル１の両端部を両側から挟み込むように保持できる。これにより、組立時の作業能率を向上できる。 The above battery pack 10 holds the plurality of battery cells 1 with the positioning spacer 3 and holds the both ends of the battery cell 1 from both sides between the first case 2X and the second case 2Y. A large number of battery cells 1 can be easily inserted into the opposing holding portions 21 while being positioned. For example, in a state where the positioning spacer 3 is arranged in the opening of the first case 2X, the battery cell 1 is inserted into the insertion hole 3A of the positioning spacer 3, and the end on the insertion side is the holding portion 21 of the first case 2X. By inserting the battery cell 1 into the first case 2X, the battery cell 1 can be positioned. In this state, a large number of battery cells 1 arranged in the first case 2X have their lower ends inserted into the holding portion 21 of the first case 2X, and their intermediate portions are positioned by the insertion holes 3A of the positioning spacer 3. Therefore, it is possible to eliminate the fact that the upper end portion is not easily inserted into the holding portion 21 of the second case 2Y without moving back and forth, left and right. That is, the battery cell 1 arranged in the first case 2X has the middle portion held in place by the positioning spacer 3, so that the position of the upper end is positioned, and the second case 2Y is The upper end portion of the battery cell 1 can be reliably inserted into the holding portion 21 of the second case 2Y while being covered from above. This structure can hold the battery cell while positioning the battery cell substantially in the same state as the battery storage part that stores about half the length of the battery cell 1. Therefore, the opposite end portion can be quickly inserted into the opposing holding portion, and both end portions of the battery cell 1 can be held so as to be sandwiched from both sides. Thereby, the work efficiency at the time of an assembly can be improved.
　位置決スペーサー３は、その厚さを薄くすることで電池セル１を挿通しやすくできると共に、電池セル１の中間部を保持する状態で、ホルダーケース２内に表出する領域を広くすることができる。したがって、位置決スペーサーの厚さは、好ましくは、電池セルの全長の１０％以下とすることができる。このような位置決スペーサー３は、樹脂製とし、あるいは金属製とすることもできる。 The positioning spacer 3 can be easily inserted through the battery cell 1 by reducing its thickness, and the region exposed in the holder case 2 can be widened while holding the middle part of the battery cell 1. it can. Therefore, the thickness of the positioning spacer can be preferably 10% or less of the total length of the battery cell. Such positioning spacer 3 can be made of resin or metal.
　以上の位置決スペーサー３は、第１ケース２Ｘと第２ケース２Ｙの対向する周壁２３で挟着されてホルダーケース２の中間に配置されている。図に示すホルダーケース２は、下ケースである第１ケース２Ｘの周壁２３の開口縁に沿って位置決めスペーサー３を配置している。このホルダーケース２は、第１ケース２Ｘと第２ケース２Ｙの対向する周壁２３で位置決スペーサー３を挟着して定位置に固定する。ただ、段差凹部は、第２ケースに設けることもできる。また、位置決スペーサーは、接着して、あるいはネジ止めや係止構造によりホルダーケースに固定することもできる。 The above positioning spacer 3 is sandwiched between the peripheral walls 23 facing each other of the first case 2X and the second case 2Y, and is arranged in the middle of the holder case 2. In the holder case 2 shown in the drawing, a positioning spacer 3 is arranged along the opening edge of the peripheral wall 23 of the first case 2X which is the lower case. The holder case 2 is fixed at a fixed position by sandwiching the positioning spacer 3 between the opposing peripheral walls 23 of the first case 2X and the second case 2Y. However, the step recess can be provided in the second case. The positioning spacer can also be fixed to the holder case by bonding or by screwing or locking structure.
　以上のようにして、内部に複数の電池セル１が収納されるホルダーケース２は、図６に示すように、第１ケース２Ｘと第２ケース２Ｙの対向位置に設けた連結ボス２９に連結ネジ３９がねじ込まれて第１ケース２Ｘと第２ケース２Ｙが固定される。図に示す第１ケース２Ｘは、端面プレート部２２と周壁２３に連結ボス２９を一体的に成形して設けている。ただ、第１ケースと第２ケースは、連結ボルトとナットを介して互いに連結することもできる。 As described above, the holder case 2 in which the plurality of battery cells 1 are housed is connected to the connection boss 29 provided at the opposing position of the first case 2X and the second case 2Y as shown in FIG. 39 is screwed to fix the first case 2X and the second case 2Y. In the first case 2X shown in the figure, a connecting boss 29 is integrally formed on the end plate portion 22 and the peripheral wall 23. However, the first case and the second case can be connected to each other via a connecting bolt and a nut.
（ホルダーケースの他の例）
　さらに、ホルダーケースは、図７に示す構造とすることもできる。この図に示すホルダーケース７２は、電池セル７１の長手方向であって、厚さ方向の中間において、第１ケース７２Ｘと第２ケース７２Ｙに二分割されており、第１ケース７２Ｘと第２ケース７２Ｙの間には、複数の電池セル７１を挿入して定位置に保持する電池ホルダ７０が配置されている。図７に示す第１ケース７２Ｘと第２ケース７２Ｙも、電池セル７１の端面である接続端子１３が内側に配置される端面プレート部２２と、この端面プレート部２２の周囲に沿って形成された周壁２３とを備えている。この第１ケース７２Ｘと第２ケース７２Ｙも、全体の外形を略矩形状としており、周壁２３の対向する開口縁が互いに連結される。 (Other examples of holder cases)
Furthermore, the holder case may have a structure shown in FIG. The holder case 72 shown in this figure is divided into a first case 72X and a second case 72Y in the longitudinal direction of the battery cell 71 and in the middle of the thickness direction, and the first case 72X and the second case 72Y. Between 72Y, the battery holder 70 which inserts the several battery cell 71 and hold | maintains in a fixed position is arrange | positioned. The first case 72X and the second case 72Y shown in FIG. 7 are also formed along the periphery of the end surface plate portion 22 and the end surface plate portion 22 where the connection terminals 13 that are the end surfaces of the battery cells 71 are disposed inside. And a peripheral wall 23. The first case 72X and the second case 72Y also have an overall outer shape that is substantially rectangular, and the opposing opening edges of the peripheral wall 23 are connected to each other.
　図７に示す電池ホルダ７０は、電池セル７１が挿入される複数の保持筒７３を連結してなる形状で、この保持筒７３の内部に電池セル７１を挿入して、複数の電池セル７１をホルダーケース７２内の定位置に配置するようにしている。図に示す電池ホルダ７０は、複数の分割ユニット７０Ａに分割されており、これ等の分割ユニット７０Ａを個別にホルダーケース７２内の定位置に固定できるようにしている。この電池ホルダ７０も前述の保持部２１と同様の配列として複数の電池セル７２を収納できる構造としている。このような電池ホルダは、アルミニウム等の金属製とすることができ、あるいは樹脂製とすることもできる。金属製の電池ホルダは、熱伝導を高くして効果的に放熱できる。樹脂製の電池ホルダは、軽量にして安価にできる。 The battery holder 70 shown in FIG. 7 has a shape formed by connecting a plurality of holding cylinders 73 into which the battery cells 71 are inserted, and the battery cells 71 are inserted into the holding cylinders 73 so that the plurality of battery cells 71 are inserted. The holder case 72 is arranged at a fixed position. The battery holder 70 shown in the figure is divided into a plurality of divided units 70A, and these divided units 70A can be individually fixed at fixed positions in the holder case 72. The battery holder 70 also has a structure in which a plurality of battery cells 72 can be accommodated in the same arrangement as the holding portion 21 described above. Such a battery holder can be made of metal such as aluminum, or can be made of resin. The battery holder made of metal can effectively dissipate heat by increasing heat conduction. The resin battery holder can be made lightweight and inexpensive.
（バスバープレート４）
　さらに、図２～図５の電池パック１０は、ホルダーケース２の上下の外側に、ホルダーケース２に収納される複数の電池セル１の両端の電極端子１３を接続するバスバープレート４を備えている。バスバープレート４は、端面プレート部２２の外側をカバーする平板状の金属板であって、端面プレート部２２の接続孔２４から表出する複数の電池セル１の電極端子１３を接続するために複数の貫通孔４０を開口している。これ等の貫通孔４０は、端面プレート部２２に開口された接続孔２４と対向する位置に開口されている。 (Bus bar plate 4)
Further, the battery pack 10 of FIGS. 2 to 5 includes a bus bar plate 4 on the upper and lower outer sides of the holder case 2 for connecting the electrode terminals 13 at both ends of the plurality of battery cells 1 stored in the holder case 2. . The bus bar plate 4 is a flat metal plate that covers the outside of the end face plate portion 22, and a plurality of bus bar plates 4 are connected to connect the electrode terminals 13 of the plurality of battery cells 1 exposed from the connection holes 24 of the end face plate portion 22. The through hole 40 is opened. These through holes 40 are opened at positions facing the connection holes 24 opened in the end face plate portion 22.
　バスバープレート４は、ホルダーケース２に収納される複数の電池セル１の電極端子１３に電気接続される。図に示す電池パック１０は、ホルダーケース２の下ケースである第１ケース２Ｘの下面側であって、端面プレート部２２の外側に配置される第１のバスバープレート４Ｘと、上ケースである第２ケース２Ｙの上面側であって、端面プレート部２２の外側に配置される第２のバスバープレート４Ｙとを備えている。これ等のバスバープレート４は、端面プレート部２２の全体を被覆する形状と大きさを有しており、ホルダーケース２に収納される全ての電池セル１の電極端子１３を接続できる大きさとしている。バスバープレート４は、これを貫通する止ネジ（図示せず）を介してホルダーケース２に固定される。この構造は、バスバープレート４をホルダーケース２の定位置に確実に固定できる。 The bus bar plate 4 is electrically connected to the electrode terminals 13 of the plurality of battery cells 1 housed in the holder case 2. The battery pack 10 shown in the drawing is a first bus bar plate 4X disposed on the lower surface side of the first case 2X which is the lower case of the holder case 2 and outside the end surface plate portion 22, and a first case which is an upper case. A second bus bar plate 4Y disposed on the upper surface side of the two cases 2Y and outside the end surface plate portion 22 is provided. These bus bar plates 4 have a shape and a size that cover the entire end surface plate portion 22, and are sized so that the electrode terminals 13 of all the battery cells 1 accommodated in the holder case 2 can be connected. . The bus bar plate 4 is fixed to the holder case 2 via a set screw (not shown) penetrating therethrough. With this structure, the bus bar plate 4 can be securely fixed to a fixed position of the holder case 2.
　バスバープレート４は、図８～図１０に示すように、リード板４５を介して電池セル１に接続される。図８と図９に示すリード板４５は、薄い金属板であって、バスバープレート４の貫通孔４０と対向する位置に連結孔４５Ａを開口すると共に、この連結孔４５Ａに位置して接続片４６、４７を備えている。接続片４６、４７は、リード板４５に一体的に連結して形成されている。リード板４５は、接続片４６、４７がバスバープレート４に開口された貫通孔４０に位置するようにバスバープレート４に固定されている。図８と図９に示すバスバープレート４は、１枚のリード板４５で構成されている。 The bus bar plate 4 is connected to the battery cell 1 via the lead plate 45 as shown in FIGS. The lead plate 45 shown in FIGS. 8 and 9 is a thin metal plate. The lead plate 45 has a connection hole 45A at a position facing the through hole 40 of the bus bar plate 4 and is connected to the connection piece 46 at the connection hole 45A. 47 are provided. The connection pieces 46 and 47 are integrally connected to the lead plate 45. The lead plate 45 is fixed to the bus bar plate 4 so that the connection pieces 46 and 47 are located in the through holes 40 opened in the bus bar plate 4. The bus bar plate 4 shown in FIGS. 8 and 9 is composed of a single lead plate 45.
　バスバープレート４は、リード板４５の接続片４６、４７が電池セル１の電極端子１３に溶着されて、電池セル１に接続される。したがって、接続片４６、４７は、接続孔２４から表出する接続端子１３と対向する位置に配置されている。接続片４６、４７は、図１０に示すように、溶接ロッド６０が押圧される状態で、接続端子１３に溶着される形状と大きさに形成されている。さらに、図８に示すリード板４５は、連結孔４５Ａの開口縁と接続片４６との間に溶断部４８を形成している。図に示す溶断部４８は、細長い線状であってクランク状に形成されており、過電流が流れる状態で溶断されて、電池セル１の電極端子１３をリード板４５から確実に遮断できる構造としている。 The bus bar plate 4 is connected to the battery cell 1 by connecting the connection pieces 46 and 47 of the lead plate 45 to the electrode terminal 13 of the battery cell 1. Therefore, the connection pieces 46 and 47 are disposed at positions facing the connection terminals 13 exposed from the connection holes 24. As shown in FIG. 10, the connection pieces 46 and 47 are formed in a shape and size that are welded to the connection terminal 13 in a state where the welding rod 60 is pressed. Further, the lead plate 45 shown in FIG. 8 has a fusing part 48 formed between the opening edge of the coupling hole 45 </ b> A and the connection piece 46. The fusing part 48 shown in the drawing is a long and thin line and is formed in a crank shape. The fusing part 48 is cut in a state where an overcurrent flows, so that the electrode terminal 13 of the battery cell 1 can be reliably cut off from the lead plate 45. Yes.
　リード板４５が固定されたバスバープレート４は、図１０に示すように、端面プレート部２２の外側面に積層される状態で配置され、リード板４５の接続片４７が端面プレート部２２の接続孔２４に配置される。接続孔２４に配置された接続片４７は、電池セル１の電極端子１３に溶着される。溶接時において、溶接ロッド６０は、図１０に示すように、リード板４５の接続片４７を端面プレート部２２の接続孔２４から表出する電極端子１３に押圧して溶着する。溶接ロッド６０は、バスバープレート４の貫通孔４０を通過して接続片４７を電池セル１の電極端子１３に押圧する状態で溶着する。以上のようにして、ホルダーケース２に収納された複数の電池セル１の両端の電極端子１３が、第１のバスバープレート４Ｘと第２のバスバープレート４Ｙとに接続されることで複数の電池セル１が並列に接続される。 As shown in FIG. 10, the bus bar plate 4 to which the lead plate 45 is fixed is arranged in a state of being laminated on the outer surface of the end face plate portion 22, and the connection piece 47 of the lead plate 45 is connected to the connection hole of the end face plate portion 22. 24. The connection piece 47 disposed in the connection hole 24 is welded to the electrode terminal 13 of the battery cell 1. At the time of welding, as shown in FIG. 10, the welding rod 60 is welded by pressing the connection piece 47 of the lead plate 45 to the electrode terminal 13 exposed from the connection hole 24 of the end face plate portion 22. The welding rod 60 is welded while passing through the through hole 40 of the bus bar plate 4 and pressing the connection piece 47 against the electrode terminal 13 of the battery cell 1. As described above, the electrode terminals 13 at both ends of the plurality of battery cells 1 housed in the holder case 2 are connected to the first bus bar plate 4X and the second bus bar plate 4Y, whereby the plurality of battery cells are connected. 1 are connected in parallel.
　さらに、図４と図５に示すバスバープレート４は、端面プレート部２２の外周縁から周壁２３に沿って折曲された折曲片４１、４３を備えており、折曲片４１、４３の先端部をさらに折曲して外部接続部４２、４４としている。図１～図５に示す電池パック１０は、外形を矩形状とするホルダーケース２の対向する側面であって、第１面２Ａに折曲片４１を配置し、第３面２Ｃに折曲片４３を配置している。このように一対のバスバープレート４の折曲片４１、４３をホルダーケース２の対向する側面に配置することで、これ等の折曲片４１、４３が互いに干渉するのを阻止している。 Further, the bus bar plate 4 shown in FIGS. 4 and 5 includes bent pieces 41 and 43 bent along the peripheral wall 23 from the outer peripheral edge of the end face plate portion 22, and the distal ends of the bent pieces 41 and 43. The portions are further bent to form external connection portions 42 and 44. The battery pack 10 shown in FIGS. 1 to 5 is a side surface facing the holder case 2 having a rectangular outer shape, and a bent piece 41 is disposed on the first surface 2A, and the bent piece is formed on the third surface 2C. 43 is arranged. Thus, by arrange | positioning the bending pieces 41 and 43 of a pair of bus-bar plate 4 in the side surface which the holder case 2 opposes, these bending pieces 41 and 43 are prevented from interfering with each other.
　第１のバスバープレート４Ｘは、ホルダーケース２の第１面２Ａに沿って折曲片４１を配置している。この折曲片４１は、第１ケース２Ｘの下面側から第１面２Ａに沿って立ち上がるように形成されると共に、先端部を水平方向に折曲して外部接続部４２としている。 The first bus bar plate 4X has a bent piece 41 arranged along the first surface 2A of the holder case 2. The bent piece 41 is formed so as to rise from the lower surface side of the first case 2X along the first surface 2A, and the front end portion is bent in the horizontal direction to form the external connection portion 42.
　第２のバスバープレート４Ｙは、ホルダーケース２の第３面２Ｃに沿って折曲片４３を配置している。この折曲片４３は、第２ケース２Ｙの上面側から第２面２Ｃに沿って垂れ下がるように形成されると共に、先端部を水平方向に折曲して外部接続部４４としている。ホルダーケース２は、第２のバスバープレート４Ｙの折曲片４３が配置される第３面２Ｃに、外部接続部４４を配置する段差面２８を形成している。このように、外部接続部４４を段差面２８配置することで、折曲片４３及び外部接続部４４をホルダーケース２の定位置に配置している。また、段差面２８において、外部接続部４４を確実に外部接続できるようにしている。 The second bus bar plate 4Y has a bent piece 43 disposed along the third surface 2C of the holder case 2. The bent piece 43 is formed so as to hang down from the upper surface side of the second case 2Y along the second surface 2C, and the distal end portion thereof is bent in the horizontal direction to form an external connection portion 44. The holder case 2 has a step surface 28 on which the external connection portion 44 is disposed on the third surface 2C on which the bent piece 43 of the second bus bar plate 4Y is disposed. In this way, by arranging the external connection portion 44 on the step surface 28, the bent piece 43 and the external connection portion 44 are arranged at fixed positions of the holder case 2. In addition, the external connection portion 44 can be reliably externally connected to the stepped surface 28.
（カバー部材）
　さらに、電池パック１０は、図１～図６に示すように、バスバープレート４が固定されたホルダーケース２の上面側及び下面側の外側に位置して、バスバープレート４を被覆するカバー部材５を備えている。図に示すカバー部材５は、バスバープレート４の表面を被覆して絶縁している。カバー部材５は、絶縁性部材とすることが好ましく、好適には樹脂製とする。これにより、絶縁性と軽量化を安価に実現できる。また耐久性と熱伝導性を考慮すれば、アルミニウムなど金属製のカバー部材も利用できる。この場合は、金属製のカバー部材の表面を、ラミネートフィルムやビニールなどの絶縁性部材で被覆し、あるいは絶縁性の塗料を塗布して絶縁することもできる。 (Cover member)
Further, as shown in FIGS. 1 to 6, the battery pack 10 is provided with a cover member 5 that covers the bus bar plate 4 and is positioned outside the upper surface side and the lower surface side of the holder case 2 to which the bus bar plate 4 is fixed. I have. The cover member 5 shown in the figure covers and insulates the surface of the bus bar plate 4. The cover member 5 is preferably an insulating member, and is preferably made of resin. Thereby, insulation and weight reduction can be realized at low cost. In view of durability and thermal conductivity, a metal cover member such as aluminum can also be used. In this case, the surface of the metal cover member can be covered with an insulating member such as a laminate film or vinyl, or can be insulated by applying an insulating paint.
　カバー部材５は、ホルダーケース２の上下面を被覆する形状と大きさを有している。図に示すカバー部材５は、ホルダーケース２の内形に沿う平板状の閉塞プレート部５１と、この閉塞プレート部５１の周囲に連結してなる側壁部５２とを備えている。側壁部５２は、外周面に係止凸部５４を設けており、この係止凸部５４をホルダーケース２の周壁２３設けた係止部３２に係止してホルダーケース２に固定されるようにしている。図に示す周壁２３は、係止凸部５４を係止する係止部３２として係止穴を開口している。さらに、図２と図３に示すホルダーケース２は、側壁部５２が連結される周壁２３を、外周壁２３ａと内周壁２３ｂとからなる二重壁構造としており、外周壁２３ａと内側壁２３ｂの間に形成される隙間に側壁部５２を挿入して、カバー部材５をホルダーケース２に連結する構造としている。図の周壁２３は、外周壁２３ａに前述の係止穴を開口して係止部３２としている。このように、ホルダーケース２側の連結部分を外周壁２３ａと内側壁２３ｂとの二重壁構造とすることで、カバー部材５をより強固にホルダーケース２に固定することができる。 The cover member 5 has a shape and a size covering the upper and lower surfaces of the holder case 2. The cover member 5 shown in the drawing includes a flat closing plate portion 51 that follows the inner shape of the holder case 2 and a side wall portion 52 that is connected to the periphery of the closing plate portion 51. The side wall 52 is provided with a locking projection 54 on the outer peripheral surface, and the locking projection 54 is locked to the locking portion 32 provided on the peripheral wall 23 of the holder case 2 so as to be fixed to the holder case 2. I have to. The peripheral wall 23 shown in the drawing has a locking hole as a locking portion 32 that locks the locking projection 54. Further, in the holder case 2 shown in FIGS. 2 and 3, the peripheral wall 23 to which the side wall 52 is connected has a double wall structure including an outer peripheral wall 23a and an inner peripheral wall 23b. The side wall 52 is inserted into the gap formed between the cover member 5 and the holder case 2. The peripheral wall 23 shown in the figure forms an engaging portion 32 by opening the aforementioned engaging hole in the outer peripheral wall 23a. Thus, the cover member 5 can be more firmly fixed to the holder case 2 by making the connecting portion on the holder case 2 side have a double wall structure of the outer peripheral wall 23a and the inner wall 23b.
　図２～図５に示すカバー部材５は、第１ケース２Ｘ側の外側であって下面側をカバーする第１のカバー部材５Ｘと、第２ケース２Ｙ側の外側であって上面側をカバーする第２のカバー部材５Ｙとを備えている。カバー部材５は、第２ケース２Ｙの上面側を第２のカバー部材５Ｙでカバーすることで、第２ケース２Ｙの端部プレート部２２と第２のカバー部材５Ｙとの間に、電池セル１の封口板１２側の端部に対向して形成される排出スペース７を設けている。 The cover member 5 shown in FIG. 2 to FIG. 5 covers the first cover member 5X that covers the lower surface side on the outer side of the first case 2X, and the upper surface side that is the outer side of the second case 2Y side. A second cover member 5Y. The cover member 5 covers the upper surface side of the second case 2Y with the second cover member 5Y, so that the battery cell 1 is interposed between the end plate portion 22 of the second case 2Y and the second cover member 5Y. A discharge space 7 is provided so as to face the end of the sealing plate 12 side.
　第１のカバー部材５Ｘは、第１ケース２Ｘの下面側を閉塞する閉塞プレート部５１と、この閉塞プレート部５１の周囲に連結されて第１ケース２Ｘの４つの側面を閉塞する側壁部５２を備えている。図４と図５の第１のカバー部材５Ｘは、ホルダーケース２の第２面２Ｂ、第３面２Ｃ、及び第４面２Ｄにおいて側壁部５２を周壁２３に連結して閉塞すると共に、第１面２Ａにおいては、第１のバスバープレート４Ｘの折曲片４１の外側面をカバーするカバー側壁部５２Ａを折曲片４１に接近させて閉塞している。図の第１のカバー部材５Ｘは、カバー側壁部５２Ａを高く形成しており、折曲片４１の外側面を広い面積でカバーできるようにしている。このように、折曲片４１をカバー側壁部５２Ａでカバーすることで、折曲片４１を定位置に配置しながら、第１のバスバープレート４Ｘと外部との意図しない接触を回避できるようにしている。 The first cover member 5X includes a closing plate portion 51 that closes the lower surface side of the first case 2X, and a side wall portion 52 that is connected to the periphery of the closing plate portion 51 and closes the four side surfaces of the first case 2X. I have. The first cover member 5X shown in FIGS. 4 and 5 connects and closes the side wall 52 to the peripheral wall 23 on the second surface 2B, the third surface 2C, and the fourth surface 2D of the holder case 2, and On the surface 2A, the cover side wall 52A that covers the outer surface of the bent piece 41 of the first bus bar plate 4X is closed by being brought close to the bent piece 41. The first cover member 5X shown in the figure has a high cover side wall 52A so that the outer surface of the bent piece 41 can be covered with a wide area. Thus, by covering the bent piece 41 with the cover side wall portion 52A, it is possible to avoid unintentional contact between the first bus bar plate 4X and the outside while arranging the bent piece 41 in a fixed position. Yes.
　また、第２のカバー部材５Ｙは、第２ケース２Ｙの上面側を閉塞する閉塞プレート部５１と、この閉塞プレート部５１の周囲に連結されて第２ケース２Ｙの４つの側面を閉塞する側壁部５２を備えている。図４と図５の第２のカバー部材５Ｙは、ホルダーケース２の第１面２Ａ、図２面２Ｂ、及び第４面２Ｄにおいて側壁部５２を周壁２３に連結して閉塞すると共に、第３面２Ｃにおいては、第２のバスバープレート４Ｙの折曲片４３側の端縁部を閉塞するリブ状の遮断部５６を閉塞プレート部５１の内面に突出して形成している。さらに、第２のカバー部材５Ｙは、第２のバスバープレート４Ｙの折曲片４３の外側面をカバーするカバー側壁部５２Ｂを折曲片４３に接近させて閉塞している。さらに、図４と図５に示す第２のカバー部材５Ｙは、カバー側壁部５２Ｂの端部であって第２面２Ｂ側の端部を切除して切除部５２Ｃを設けている。この切除部５２Ｃは、ホルダーケース２に設けた突出連結部３６の上面をカバーしている。 The second cover member 5Y includes a closing plate portion 51 that closes the upper surface side of the second case 2Y, and a side wall portion that is connected to the periphery of the closing plate portion 51 and closes the four side surfaces of the second case 2Y. 52. The second cover member 5Y of FIGS. 4 and 5 connects and closes the side wall 52 to the peripheral wall 23 on the first surface 2A, FIG. 2 surface 2B, and the fourth surface 2D of the holder case 2, and On the surface 2 </ b> C, a rib-shaped blocking portion 56 that closes the end edge portion of the second bus bar plate 4 </ b> Y on the bent piece 43 side is formed to protrude from the inner surface of the closing plate portion 51. Further, the second cover member 5Y closes the cover side wall portion 52B that covers the outer surface of the bent piece 43 of the second bus bar plate 4Y close to the bent piece 43. Further, the second cover member 5Y shown in FIGS. 4 and 5 is provided with a cutout portion 52C by cutting off the end portion of the cover side wall portion 52B and the second surface 2B side. The cut portion 52 </ b> C covers the upper surface of the projecting coupling portion 36 provided in the holder case 2.
（排出スペース７）
　さらに、電池パック１０は、図２と図３に示すように、ホルダーケース２の上下面である端面プレート部２２の外側に形成される収納凹部２５を、カバー部材５で閉塞することで、ホルダーケース２とカバー部材５との間に電池セル１の端面から噴出される噴出体を流入させる排出スペース７を形成している。ホルダーケース２とカバー部材５との間に形成される排出スペース７は、バスバープレート４が配置されている。排出スペース７に配置されるバスバープレート４は、端面プレート部２２に積層して配置されており、バスバープレート４とカバー部材５との間に形成される隙間を排出スペース７としている。このような排出スペース７は、その隙間の幅を、数ｍｍ～数ｃｍとすることができる。 (Discharge space 7)
Further, as shown in FIGS. 2 and 3, the battery pack 10 includes a cover member 5 that closes a storage recess 25 formed on the outer side of the end surface plate portion 22 that is the upper and lower surfaces of the holder case 2. A discharge space 7 is formed between the case 2 and the cover member 5 for allowing a spray body sprayed from the end face of the battery cell 1 to flow in. A bus bar plate 4 is disposed in a discharge space 7 formed between the holder case 2 and the cover member 5. The bus bar plate 4 disposed in the discharge space 7 is stacked on the end face plate portion 22, and a gap formed between the bus bar plate 4 and the cover member 5 is defined as the discharge space 7. Such a discharge space 7 can have a gap width of several mm to several cm.
　以上の電池パック１０は、電池セル１に異常が発生してさらに過熱されると、内部から高温のガスが噴出し、あるいは燃焼する火炎となって噴出されることがある。このような場合、電池セル１は、外装缶１１の開口部を閉塞してなる封口板１２から高温のガスや火炎等の噴出体が噴出される状態となりやすい。したがって、電池パック１０は、電池セル１の封口板１２が配置される側の第２ケース２Ｙの外部に形成される排出スペース７には、この排出スペース７を外部に連通される開口部３５を設けている。これにより、異常が生じた電池セル１から排出される高温の噴出物を開口部３５から外部に誘導して排出できるようにしている。 If the battery pack 10 described above is abnormally generated in the battery cell 1 and further overheated, high temperature gas may be ejected from the inside or may be ejected as a burning flame. In such a case, the battery cell 1 is likely to be in a state in which a jet body such as high-temperature gas or flame is ejected from the sealing plate 12 formed by closing the opening of the outer can 11. Therefore, in the battery pack 10, the discharge space 7 formed outside the second case 2Y on the side where the sealing plate 12 of the battery cell 1 is disposed has an opening 35 that communicates with the discharge space 7 to the outside. Provided. Thereby, the high-temperature ejected matter discharged from the battery cell 1 in which an abnormality has occurred can be guided and discharged from the opening 35 to the outside.
　図１～図５に示す電池パックは、電池セル１の封口板１２を設けた端部と対向する排出スペース７であって、ホルダーケース２の上面側に設けた排出スペース７については、側壁部５２を介して周囲を閉塞すると共に、周囲の一部の領域を側壁部５２で閉塞することなく外部に連通させて、電池セル１の異常時に電池セル１の端面から排出される噴出物を通過させる開口部３５を設けている。図に示すホルダーケース２は、側面である第３面２Ｃの隅部（図４では右上部）であって、第２のカバー部材５Ｙに設けた切除部５２Ｃと対向する位置に、水平方向に突出する突出連結部３６を設けており、この突出連結部３６の上面側に形成された側壁を一部除去することで、排出スペース７を外部に連通させる開口部３５を設けている。このホルダーケース２は、第２ケース２Ｙの上面側を第２のカバー部材５Ｙで閉塞する状態で、突出連結部３６の上面側を閉塞プレート部５１の端部で閉塞しており、開口部３５に切除部５２Ｃを配置することにより、開口部３５を介して排出スペース７を外部に連通させている。この開口部３５は、図２に示すように、周囲が閉塞された排出スペース７を外部に連通させる唯一の領域として、異常が生じた電池セル１から排出される噴出物を通過させて外部に排出する。 The battery pack shown in FIGS. 1 to 5 is a discharge space 7 facing the end portion of the battery cell 1 where the sealing plate 12 is provided, and the discharge space 7 provided on the upper surface side of the holder case 2 has a side wall portion. 52, the periphery is closed, and a part of the surrounding area is communicated to the outside without being blocked by the side wall portion 52, and the ejected matter discharged from the end face of the battery cell 1 when the battery cell 1 is abnormal passes. An opening 35 is provided. The holder case 2 shown in the drawing is a corner portion (upper right portion in FIG. 4) of the third surface 2C, which is a side surface, at a position facing the cutout portion 52C provided in the second cover member 5Y in the horizontal direction. A protruding connecting portion 36 that protrudes is provided, and an opening 35 that allows the discharge space 7 to communicate with the outside is provided by partially removing the side wall formed on the upper surface side of the protruding connecting portion 36. The holder case 2 has the upper surface side of the second case 2Y closed by the second cover member 5Y, and the upper surface side of the projecting coupling portion 36 is closed by the end of the closing plate portion 51, and the opening 35 By disposing the cut portion 52C, the discharge space 7 is communicated to the outside through the opening 35. As shown in FIG. 2, the opening 35 is the only region that allows the discharge space 7 whose periphery is closed to communicate with the outside, and allows the ejected matter discharged from the battery cell 1 in which an abnormality has occurred to pass outside. Discharge.
　さらに、電池パック１０は、この開口部３５の近傍に、温度異常を検出する温度検出部６を配置している。電池パック１０は、バスバープレート４の一部であって、ホルダーケース２の特定の部分に対向して温度検出部６を配置している。図に示すホルダーケース２は、突出連結部３６の上面にバスバープレート４の連結片４ａを配置しており、この連結片４ａの上面に温度検出部６を配置している。図に示す温度検出部６は、いずれかの電池セル１に異常が発生して、電池端面から高温の噴出物が排出され、あるいは発火すると、これ等の熱を確実に検出できるように、電池セル１から噴出された噴出物が通過する開口部３５に接近して配置している。 Furthermore, the battery pack 10 has a temperature detection unit 6 for detecting a temperature abnormality in the vicinity of the opening 35. The battery pack 10 is a part of the bus bar plate 4, and the temperature detection unit 6 is disposed facing a specific part of the holder case 2. In the holder case 2 shown in the figure, the connecting piece 4a of the bus bar plate 4 is arranged on the upper surface of the protruding connecting portion 36, and the temperature detecting unit 6 is arranged on the upper surface of the connecting piece 4a. The temperature detection unit 6 shown in the figure is a battery that can reliably detect heat generated when an abnormality occurs in any of the battery cells 1 and a high-temperature ejected matter is discharged from the battery end face or ignites. It is arranged close to the opening 35 through which the ejected matter ejected from the cell 1 passes.
　図２に示す電池パック１０は、いずれかの電池セル１（図２においては中央部の電池セル）に異常が生じて高温の噴出物が排出される状態を鎖線で示すと共に、この電池セル１から排出される噴出物が排出スペース７を通過して開口部３５から外部に排出される状態を矢印で示している。この図に示すように、異常が生じた電池セル１から排出される噴出物は排出スペース７内に流入されるが、排出スペース７は周囲を側壁部５２や遮断部５６で閉塞されているので、この閉塞部分から噴出物が外部に排出されることはなく、側壁部５２が切除された切除部５２Ｃに形成された開口部３５から外部に排出される。このため、排出スペース７内に流入される高温の噴出物は、外部に排出される際には確実に開口部３５を通過し、この開口部３５に接近して配置される温度検出部６により温度異常を確実に検出することができる。 The battery pack 10 shown in FIG. 2 shows a state where an abnormality occurs in any one of the battery cells 1 (battery cell in the center in FIG. 2) and a high-temperature ejected matter is discharged by a chain line. A state in which the ejected matter discharged from the air passes through the discharge space 7 and is discharged to the outside from the opening 35 is indicated by an arrow. As shown in this figure, the ejected matter discharged from the battery cell 1 in which an abnormality has occurred flows into the discharge space 7, but the discharge space 7 is blocked by the side wall portion 52 and the blocking portion 56. The ejected matter is not discharged to the outside from the closed portion, and is discharged to the outside through the opening 35 formed in the cutout portion 52C in which the side wall portion 52 is cut off. For this reason, the high-temperature ejected product flowing into the discharge space 7 reliably passes through the opening 35 when discharged to the outside, and is detected by the temperature detector 6 disposed close to the opening 35. A temperature abnormality can be reliably detected.
　なお、図２と図４に示す第２のカバー部材５Ｙは、開口部３５側の端縁部において、閉塞プレート部５１を一段低く成形してなる段差部５５を形成している。このように、第２のカバー部材５Ｙに段差部５５を形成することで、この段差部５５の内面を温度検出部６に接近させて、排出スペース７から排出される噴出物を、図２に示すように温度検出部６に接近するように通過させて、確実に温度検出できる。 Note that the second cover member 5Y shown in FIGS. 2 and 4 has a stepped portion 55 formed by molding the closing plate portion 51 one step lower at the edge on the opening 35 side. In this way, by forming the step portion 55 on the second cover member 5Y, the inner surface of the step portion 55 is brought close to the temperature detection portion 6, and the ejected matter discharged from the discharge space 7 is shown in FIG. As shown, the temperature can be reliably detected by passing the temperature detector 6 so as to approach it.
（温度検出部６）
　このような温度検出部６は、温度上昇を感知して電流を遮断するヒューズやブレーカ等の電流遮断素子、あるいは、周囲温度を検出する温度センサー等が使用できる。ヒューズやブレーカ等である電流遮断素子は、開口部３５から高温のガスが排出されると、高温ガスの熱で溶断され、あるいは可動接点を反転させて電流を遮断する。このような電流遮断素子である温度検出部６は、例えば、電池セルの中間電位を検出するリード線に接続することができる。 (Temperature detector 6)
Such a temperature detector 6 can use a current interrupting element such as a fuse or a breaker that senses a temperature rise and interrupts the current, or a temperature sensor that detects the ambient temperature. When a high-temperature gas is discharged from the opening 35, a current interruption element such as a fuse or a breaker is blown by the heat of the high-temperature gas, or reverses the movable contact to interrupt the current. The temperature detection unit 6 that is such a current interruption element can be connected to, for example, a lead wire that detects an intermediate potential of the battery cell.
　図１１は、複数の電池パック１０を備えるバッテリパック１００を示している。この図に示すバッテリパック１００は、１０個の電池パック１０を備えており、これ等の電池パック１０を外装ケース８に収納して互いに直列に接続している。さらに、各電池パック１０には、中間電位を検出するためのリード線７６が接続されている。電流遮断素子である温度検出部６は、図４に示すように、バスバープレート４の連結片４ａに接続すると共に、他端をリード線７６を介して電池パック１０の外部に配置されたコントローラ７５に接続している。この場合、電池パック１０に収納される電池セル１のいずれかに異常が生じて高温のガス等が排出されると、電流遮断素子が作動して中間電位を検出する検出ラインが切断されるので、異常が生じた電池セル１が収納された電池パック１０の中間電位をコントローラ７５側で検出できなくなる。これにより、異常が生じた電池セル１を含む電池パック１０を速やかに特定できる。 FIG. 11 shows a battery pack 100 including a plurality of battery packs 10. The battery pack 100 shown in this figure includes ten battery packs 10, and these battery packs 10 are housed in an outer case 8 and connected in series with each other. Furthermore, a lead wire 76 for detecting an intermediate potential is connected to each battery pack 10. As shown in FIG. 4, the temperature detection unit 6, which is a current interruption element, is connected to the connecting piece 4 a of the bus bar plate 4, and the other end is disposed outside the battery pack 10 via the lead wire 76. Connected to. In this case, if an abnormality occurs in any of the battery cells 1 stored in the battery pack 10 and a high-temperature gas or the like is discharged, the detection line for detecting the intermediate potential is cut off by operating the current interrupting element. Thus, the controller 75 cannot detect the intermediate potential of the battery pack 10 in which the abnormal battery cell 1 is stored. Thereby, the battery pack 10 including the battery cell 1 in which an abnormality has occurred can be quickly identified.
　また、温度センサーである温度検出部は、周囲温度を抵抗値の変化として検出する。この温度検出部は、コントローラで検出される温度センサーから入力される周囲温度が所定の温度を超えると、いずれかの電池セルに異常が生じていることを温度センサーの検出温度から検出できる。 Also, the temperature detector, which is a temperature sensor, detects the ambient temperature as a change in resistance value. When the ambient temperature input from the temperature sensor detected by the controller exceeds a predetermined temperature, the temperature detection unit can detect that an abnormality has occurred in one of the battery cells from the detected temperature of the temperature sensor.
　以上の電池パック１０は、図６に示すように、ホルダーケース２に設けた７６個の保持部２１に電池セル１を収納している。すなわち、この電池パック１０は、電池容量を４．６２Ａｈ／セルとする７６本の電池セル１をバスバープレート４を介して並列に接続して、出力電圧が約３Ｖ～４．１５Ｖの大容量の電池パック１０を構成している。なお、ホルダーケース２に収納される電池セル１の数、配列及び接続に関してはこれに限られるものではなく、必要とされる電圧や出力容量によって変更が可能なことは言うまでもない。 As shown in FIG. 6, the above battery pack 10 stores the battery cells 1 in 76 holding portions 21 provided in the holder case 2. In other words, this battery pack 10 has 76 battery cells 1 having a battery capacity of 4.62 Ah / cell, connected in parallel via the bus bar plate 4, and has a large capacity of about 3V to 4.15V. A battery pack 10 is configured. It should be noted that the number, arrangement and connection of the battery cells 1 stored in the holder case 2 are not limited to this, and needless to say, it can be changed depending on the required voltage and output capacity.
　本発明は、複数の電池セルをホルダーケース内に収納してなる電池パックであって、載置型の蓄電用設備の電源として、あるいは種々の電池機器のバックアップ用電源として好適に利用できる。 The present invention is a battery pack in which a plurality of battery cells are housed in a holder case, and can be suitably used as a power source for a mounting-type power storage facility or as a backup power source for various battery devices.
１００…バッテリパック
１…電池セル
２…ホルダーケース
２Ｘ…第１ケース
２Ｙ…第２ケース
２Ａ…第１面
２Ｂ…第２面
２Ｃ…第３面
２Ｄ…第４面
３…位置決スペーサー
３Ａ…挿通孔
４…バスバープレート
４Ｘ…第１のバスバープレート
４Ｙ…第２のバスバープレート
４ａ…連結片
５…カバー部材
５Ｘ…第１のカバー部材
５Ｙ…第２のカバー部材
６…温度検出部
７…排出スペース
８…外装ケース
１０…電池パック
１１…外装缶
１２…封口板
１３…電極端子
１４…凸部電極
２０…中空部
２１…保持部
２２…端面プレート部
２３…周壁
２３Ａ…段差凹部
２３ａ…外周壁
２３ｂ…内周壁
２４…接続孔
２５…収納凹部
２８…段差面
２９…連結ボス
３２…係止部
３５…開口部
３６…突出連結部
３９…連結ネジ
４０…貫通孔
４１…折曲片
４２…外部接続部
４３…折曲片
４４…外部接続部
４５…リード板
４５Ａ…連結孔
４６…接続片
４７…接続片
４８…溶断部
５１…閉塞プレート部
５２…側壁部
５２Ａ…カバー側壁部
５２Ｂ…カバー側壁部
５２Ｃ…切除部
５４…係止凸部
５５…段差部
５６…遮断部
６０…溶着ロッド
７０…電池ホルダ
７０Ａ…分割ユニット
７１…電池セル
７２…ホルダーケース
７２Ｘ…第１ケース
７２Ｙ…第２ケース
７３…保持筒
７５…コントローラ
７６…リード線
  DESCRIPTION OF SYMBOLS 100 ... Battery pack 1 ... Battery cell 2 ... Holder case 2X ... 1st case 2Y ... 2nd case 2A ... 1st surface 2B ... 2nd surface 2C ... 3rd surface 2D ... 4th surface 3 ... Positioning spacer 3A ... Insertion Hole 4 ... bus bar plate 4X ... first bus bar plate 4Y ... second bus bar plate 4a ... connecting piece 5 ... cover member 5X ... first cover member 5Y ... second cover member 6 ... temperature detector 7 ... discharge space DESCRIPTION OF SYMBOLS 8 ... Outer case 10 ... Battery pack 11 ... Outer can 12 ... Sealing plate 13 ... Electrode terminal 14 ... Convex part electrode 20 ... Hollow part 21 ... Holding part 22 ... End surface plate part 23 ... Peripheral wall 23A ... Step recessed part 23a ... ... Inner peripheral wall 24 ... Connection hole 25 ... Storage recess 28 ... Step surface 29 ... Connection boss 32 ... Locking part 35 ... Opening part 36 ... Projection connection part 39 ... Connection screw 40 ... Through hole 41 ... Bending piece 42 ... External connection Part 3 ... bent piece 44 ... external connection part 45 ... lead plate 45A ... connection hole 46 ... connection piece 47 ... connection piece 48 ... fusing part 51 ... closing plate part 52 ... side wall part 52A ... cover side wall part 52B ... cover side wall part 52C ... excision part 54 ... locking convex part 55 ... step part 56 ... blocking part 60 ... welding rod 70 ... battery holder 70A ... division unit 71 ... battery cell 72 ... holder case 72X ... first case 72Y ... second case 73 ... holding Tube 75 ... Controller 76 ... Lead wire

Claims (6)

  1. 　筒状で有底の外装缶の開口部を封口板で閉塞してなる複数の電池セルと、
    　前記複数の電池セルを互いに平行な姿勢とし、かつ各電池セルの両端に設けられた電極端子を同一面に配置する姿勢で保持するホルダーケースと、
    　前記ホルダーケースの上下面に配置されて、前記電池セルの電極端子が接続される一対のバスバープレートと、
    　前記ホルダーケースの上下の外側に配置されて、前記バスバープレートを被覆するカバー部材と、
    　前記ホルダーケースと前記カバー部材との間に配置されて、周囲温度を検出する温度検出部と
    を備えており
    　前記カバー部材と前記ホルダーケースとの間に、前記電池セルの異常時において、該電池セルの端面から噴出される噴出体を流入させる排出スペースを形成しており、
    　前記排出スペースは、周囲が閉塞されると共に、周囲の一部の領域を外部に連通させて、噴出物を通過させる開口部を設けており、前記開口部に接近して前記温度検出部を配置してなる電池パック。     A plurality of battery cells formed by closing the opening of a cylindrical and bottomed outer can with a sealing plate;
    A holder case for holding the plurality of battery cells in a parallel posture and holding the electrode terminals provided at both ends of each battery cell in a posture on the same plane;
    A pair of bus bar plates disposed on the upper and lower surfaces of the holder case to which the electrode terminals of the battery cells are connected;
    A cover member disposed on the upper and lower outer sides of the holder case and covering the bus bar plate;
    The battery is provided between the holder case and the cover member, and includes a temperature detection unit that detects an ambient temperature. The battery between the cover member and the holder case is in an abnormal state of the battery cell. A discharge space is formed to allow the ejected body ejected from the end face of the cell to flow in,
    The discharge space is closed at the periphery, and has an opening that allows a portion of the surrounding area to communicate with the outside and allow the ejected matter to pass therethrough, and the temperature detector is disposed close to the opening. Battery pack.
  2. 　請求項１に記載される電池パックであって、
    　前記ホルダーケースは、第１ケースと第２ケースに分割されており、前記第１ケース及び前記第２ケースは、前記電池セルの端面が内側に配置される端面プレート部と、前記端面プレート部の周囲に沿って形成された周壁とを備えており、
    　前記第１ケース及び前記第２ケースは、前記端面プレート部の外側面に前記バスバープレートを配置する収納凹部を形成しており、前記収納凹部を前記カバー部材でカバーして前記排出スペースを形成している電池パック。     The battery pack according to claim 1,
    The holder case is divided into a first case and a second case. The first case and the second case include an end surface plate portion in which an end surface of the battery cell is disposed inside, and an end plate portion of the end surface plate portion. A peripheral wall formed along the periphery,
    The first case and the second case have a storage recess for disposing the bus bar plate on the outer surface of the end face plate portion, and the storage recess is covered with the cover member to form the discharge space. Battery pack.
  3. 　請求項２に記載される電池パックであって、
    　前記複数の電池セルは、同じ向きに並べて前記ホルダーケースに収納されており、
    　前記第１ケース及び前記第２ケースは、前記端面プレート部を貫通する接続孔を開口して、前記接続孔から前記電池セルの電極端子を露出させると共に、前記電極端子を前記バスバープレートに接続して前記複数の電池セルを並列に接続してなる電池パック。     The battery pack according to claim 2,
    The plurality of battery cells are stored in the holder case side by side in the same direction,
    The first case and the second case open a connection hole that penetrates the end face plate portion, expose the electrode terminal of the battery cell from the connection hole, and connect the electrode terminal to the bus bar plate. A battery pack formed by connecting the plurality of battery cells in parallel.
  4. 　請求項１から３のいずれか一項に記載される電池パックであって、
    　前記ホルダーケースが熱硬化性樹脂で成形されてなる電池パック。     The battery pack according to any one of claims 1 to 3,
    A battery pack in which the holder case is formed of a thermosetting resin.
  5. 　請求項１から４のいずれか一項に記載される電池パックであって、
    　前記電池セルの封口板を設けた端部と対向する前記排出スペースに前記開口部を形成してなる電池パック。     The battery pack according to any one of claims 1 to 4,
    A battery pack formed by forming the opening in the discharge space facing an end provided with a sealing plate of the battery cell.
  6. 　請求項１から５のいずれか一項に記載される電池パックであって、
    　前記温度検出部が温度ヒューズで、一端が前記バスバープレートに接続されると共に、他端がリード線を介して外部に接続されてなる電池パック。
          The battery pack according to any one of claims 1 to 5,
    A battery pack in which the temperature detection unit is a thermal fuse, one end is connected to the bus bar plate, and the other end is connected to the outside via a lead wire.
PCT/JP2017/008649 2016-03-30 2017-03-06 Battery pack WO2017169524A1 (en)

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CN112335110B (en) * 2018-06-26 2022-08-05 三洋电机株式会社 Power supply device and vehicle having the same
CN112335110A (en) * 2018-06-26 2021-02-05 三洋电机株式会社 Power supply device and vehicle having the same
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CN113287223A (en) * 2018-12-28 2021-08-20 赛峰航空***公司 Battery storage shell and emergency positioning transmitter
CN113287223B (en) * 2018-12-28 2024-01-23 赛峰航空***公司 Battery storage housing and emergency positioning transmitter
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CN114651363A (en) * 2019-12-03 2022-06-21 三洋电机株式会社 Battery pack
CN115004463A (en) * 2020-02-05 2022-09-02 阿莫绿色技术有限公司 Battery module for energy storage device
JP2023500527A (en) * 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 Battery modules including module busbars, battery packs and electronic devices including the same
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CN114335802A (en) * 2021-12-30 2022-04-12 重庆跃达电力设备有限公司 Intelligent energy storage battery pack for 5G communication

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