WO2019111425A1 - Cell pack - Google Patents

Cell pack Download PDF

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Publication number
WO2019111425A1
WO2019111425A1 PCT/JP2018/010420 JP2018010420W WO2019111425A1 WO 2019111425 A1 WO2019111425 A1 WO 2019111425A1 JP 2018010420 W JP2018010420 W JP 2018010420W WO 2019111425 A1 WO2019111425 A1 WO 2019111425A1
Authority
WO
WIPO (PCT)
Prior art keywords
housing
battery
battery pack
reinforcing portion
stress concentration
Prior art date
Application number
PCT/JP2018/010420
Other languages
French (fr)
Japanese (ja)
Inventor
政文 志波
孝行 中島
独志 西森
Original Assignee
日立オートモティブシステムズ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日立オートモティブシステムズ株式会社 filed Critical 日立オートモティブシステムズ株式会社
Publication of WO2019111425A1 publication Critical patent/WO2019111425A1/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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/249—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders specially adapted for aircraft or vehicles, e.g. cars or trains
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K1/00—Arrangement or mounting of electrical propulsion units
    • B60K1/04—Arrangement or mounting of electrical propulsion units of the electric storage means for propulsion
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/209—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for prismatic or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/233—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions
    • H01M50/242—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions adapted for protecting batteries against vibrations, collision impact or swelling
    • 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 provided with a plurality of single cells.
  • the assembled battery described in Patent Document 1 includes a battery module group in which a plurality of battery modules are stacked.
  • the battery module is configured by stacking a plurality of flat type batteries in which electrode terminals are electrically connected to each other and storing the stacked battery in a housing.
  • an electrode terminal is led to the outside from an exterior material that seals the power generation element.
  • the battery assembly described in Patent Document 1 is characterized in that a reinforcing portion for reinforcing the housing is provided at a position corresponding to the electrode terminal of the flat battery in the battery module (the same document, Claims) See 1).
  • a battery pack provided with a plurality of single cells is mounted on a vehicle such as an electric car or a hybrid car, for example, and a large force acts on the housing at the time of a collision of the vehicle, for example. Is considered. Even in such a case, it is required to suppress the crushing of the housing and to protect the unit cells inside the housing.
  • One aspect of the present invention provides a battery pack capable of preventing crushing of a housing and protecting single cells in the housing.
  • One aspect of the present invention is a battery pack including a housing having a battery housing space and a secondary battery disposed in the battery housing space, wherein a reinforcing portion extends from one end of the battery housing space to the other end
  • the battery pack is characterized in that the reinforcing portion has a concave stress concentration portion facing the battery housing space.
  • the housing is reinforced by the rigidity of the reinforcing portion extending from one end to the other end of the battery housing space inside the housing, and the external force in the direction from one end to the other end of the battery housing space is the housing When it acts on, it can control the collapse of the case.
  • the reinforcing portion has a concave stress concentration portion facing the battery housing space. Therefore, when a load exceeding the buckling load acts on the reinforcing portion, stress concentrates on the concave stress concentration portion facing the battery accommodation space, and the reinforcement portion is on the opposite side to the stress concentration portion, ie, in a direction away from the battery accommodation space. To buckle. Thereby, the secondary battery disposed in the battery accommodating space inside the housing can be protected from the destruction due to the deformation of the reinforcing portion.
  • a battery pack capable of preventing crushing of the housing and protecting single cells in the housing.
  • FIG. 2 is a perspective view showing a stacked state of a plurality of secondary batteries of the battery pack of FIG. 1.
  • disconnected in the cross section which follows the IV-IV line of FIG. The enlarged view of the area
  • FIG. 3 is a perspective view of a reinforcing portion disposed in the housing shown in FIG. 2;
  • the perspective view which shows the state which removed some housings and auxiliary machinery of the battery pack of FIG. Sectional drawing which shows the cross-sectional shape of the reinforcement part shown in FIG. 8, and its modification.
  • the enlarged plan view which shows the shape of the stress concentration part of the reinforcement part shown in FIG. 8, and its modification.
  • the top view which shows the shape of the stress concentration part of the reinforcement part shown in FIG. 8, and its modification.
  • FIG. 1 is an external perspective view of a battery pack 100 according to an embodiment of the present invention.
  • FIG. 2 is a perspective view of the battery pack 100 of FIG. 1 from which a part of the case 10 and accessories are removed.
  • FIG. 3 is a perspective view showing a stacked state of the plurality of secondary batteries 1 accommodated in the housing 10 of the battery pack 100 of FIG.
  • FIG. 4 is a perspective view showing a state of being cut at a cross section taken along line IV-IV of FIG.
  • FIG. 5 is an enlarged view of a region V surrounded by an alternate long and short dash line shown in FIG.
  • the battery pack 100 includes a housing 10 having a battery storage space S1, and the secondary battery 1 disposed in the battery storage space S1 inside the housing 10.
  • the battery pack 100 of the present embodiment has a reinforcing portion 30 extending from one end of the battery housing space S1 to the other end, and the reinforcing portion 30 has a concave stress facing the battery housing space S1. It is characterized by having a concentration unit 31.
  • the housing 10 has, for example, a substantially rectangular parallelepiped rectangular box shape.
  • Each drawing shows an orthogonal coordinate system in which the depth direction of the housing 10 is the X axis, the width direction is the Y axis, and the height direction is the Z axis.
  • the housing 10 has a dimension in the width direction larger than a dimension in the depth direction. That is, the housing 10 has a height direction (Z-axis direction) perpendicular to the bottom wall, a longitudinal direction (Y-axis direction) perpendicular to the height direction, and short sides perpendicular to the longitudinal direction and the height direction. It is formed in the shape of a rectangular box having a direction (X-axis direction).
  • the housing 10 has, for example, a rectangular box-shaped main body 11 whose upper portion is opened, and a cover 12 which covers the opening 11 a of the upper portion of the main body 11.
  • the material of the main body 11 is, for example, a metal material such as electrogalvanized steel plate
  • the material of the cover 12 is, for example, a resin material such as polybutylene terephthalate (PBT).
  • a pair of high voltage terminals 101 and 101 which are external terminals of the positive electrode and the negative electrode of the battery pack 100 are provided at one end in the short direction of the cover 12 of the housing 10 and at both ends in the longitudinal direction.
  • a signal connector 102 is provided at a position adjacent to.
  • the battery housing space S1 is a region, space, section or housing portion for housing the secondary battery 1 inside the housing 10.
  • the battery housing space S1 is adjacent to one side wall 10a in the short direction of the housing 10, and is provided on one side in the short direction of the housing 10.
  • Battery housing space S1 faces, for example, three side walls 10a, 10c, 10d on one side of housing 10 and both sides in the longitudinal direction, bottom wall 10e and cover 12, and terminal surface 1a of secondary battery 1. It is a space defined by being surrounded by the resin-made bus bar case 26 which is disposed.
  • a battery module 20 in which a plurality of secondary batteries 1 are stacked in a battery housing space S1 is disposed.
  • each of the secondary batteries 1 constituting the battery module 20 is, for example, a flat rectangular lithium ion secondary battery.
  • the secondary battery 1 has a wide rectangular side surface 1w having the largest area on both sides in the thickness direction, and has a long rectangular bottom surface 1b and a terminal surface 1a at one end and the other end in the short side direction of the wide side surface 1w.
  • the narrow side 1 n has the smallest area at both ends in the longitudinal direction of the wide side 1 w.
  • the secondary battery 1 has external terminals 1P and 1N on a terminal surface 1a which is one side surface along the thickness direction. More specifically, external terminals 1P and 1N of a positive electrode and a negative electrode are provided at one end and the other end in the longitudinal direction of the terminal surface 1a of the secondary battery 1, respectively.
  • the flat rectangular secondary battery 1 is stacked in the thickness direction, and a wide side surface 1 w facing the thickness direction of the secondary battery 1 faces the bottom wall 10 e of the housing 10.
  • the battery module 20 has, for example, two or more rows of battery rows L1 composed of a plurality of secondary batteries 1 stacked in the thickness direction.
  • the two or more battery lines L1 are arranged, for example, in the longitudinal direction of the terminal surface 1a of the secondary battery 1 constituting each battery line L1.
  • the terminal surfaces 1a of all the secondary batteries 1 constituting each battery column L1 of the battery module 20 are directed in one direction, that is, forward in the depth direction (X-axis positive direction) of the case 10 of the battery pack 100.
  • Two secondary batteries 1 adjacent to each other in the stacking direction are alternately arranged to be inverted by 180 degrees.
  • the external terminal 1P of the positive electrode of one secondary battery 1 and the external terminal 1N of the negative electrode of the other secondary battery 1 Adjacent in the stacking direction.
  • bus bar 21 from secondary battery 1 arranged at one end in the stacking direction of each battery row L1 to secondary battery 1 arranged at the other end in the stacking direction. Connected in series. More specifically, battery module 20 has an external terminal 1P of the positive electrode of one secondary battery 1 and an external terminal of the negative electrode of the other secondary battery 1 among two secondary batteries 1 adjacent to each other in the stacking direction. The plurality of secondary batteries 1 are connected in series by sequentially connecting 1N with the bus bar 21 in the stacking direction. Note that, in the battery module 20, for example, a plurality of battery lines L1 may be connected in series or in parallel by the bus bar 21.
  • the battery module 20 has cell holders 22 facing the wide side 1 w on both sides in the thickness direction of the individual secondary batteries 1.
  • the cell holder 22 has a plurality of convex portions 22a in contact with the wide side surface 1w on the surface facing the wide side surface 1w of the secondary battery 1, and is alternately stacked with the secondary battery 1 in the stacking direction of the secondary battery 1
  • the individual secondary batteries 1 are held from both sides in the thickness direction.
  • the cell holders 22 at both ends in the stacking direction of the secondary battery 1 have flat surfaces on the side opposite to the secondary battery 1.
  • the cell holder 22 can be manufactured, for example, by injection molding using a resin material having electrical insulation such as PBT as a material.
  • the battery module 20 includes the secondary battery 1, the bus bar 21, the cell holder 22, the end plate 23, the side plate 24, the center plate 25, the bus bar case 26, the electronic circuit board 27, and the thermistor 28 5), a voltage detection line V1, and accessories 29 (see FIG. 6).
  • the configuration of the bus bar case 26 is shown through the electronic circuit board 27.
  • the bus bar 21 is a metal plate-like member connected to the external terminals 1P and 1N of the secondary battery 1.
  • the pair of end plates 23 is, for example, a metal plate-like member, and is disposed outside the cell holders 22 at both ends in the stacking direction of the secondary battery 1, and a plurality of secondary batteries via the plurality of cell holders 22. 1 is held from both sides in the stacking direction.
  • the side plate 24 is, for example, a metal plate-like member, and is disposed at both ends in the arrangement direction of the two or more battery rows L1 arranged in the longitudinal direction of the terminal surface 1a of the secondary battery 1 It faces the narrow side surface 1 n of the secondary battery 1 through a resin member having an electrical insulation property such as a part of 22.
  • the pair of side plates 24 has screw holes at upper and lower ends in the height direction of the housing 10, for example, and is fixed to the end plate 23 by bolts.
  • Center plate 25 is, for example, a plate-like member made of metal, is disposed between battery row L1 and battery row L1, and secondary battery 1 via a resin member having electrical insulation such as a part of cell holder 22. Opposite the narrow side 1 n of the When battery row L1 is in two rows, one center plate 25 is disposed between battery rows L1. When battery row L1 is in three or more rows, two or more center plates 25 are in battery row L1. Placed in between.
  • the center plate 25 has, for example, screw holes at upper and lower ends in the height direction of the housing 10 and is fixed to the end plate 23 by bolts.
  • the bus bar case 26 is, for example, a plate-like or frame-like member made of an electrically insulating resin and is disposed to face the terminal surfaces 1 a of the plurality of secondary batteries 1 constituting the battery module 20.
  • the bus bar case 26 has an opening at a position corresponding to the external terminals 1P and 1N of the plurality of secondary batteries 1, for example, and supports the bus bar 21 on a support provided around the opening and is adjacent
  • the bus bars 21 are electrically isolated by the partition walls.
  • the electronic circuit board 27 is fixed to, for example, the bus bar case 26 and disposed so as to face the terminal surface 1 a of the secondary battery 1 via the bus bar case 26.
  • the electronic circuit board 27 includes, for example, a voltage detection circuit, a temperature detection circuit, and a control circuit.
  • the electronic circuit board 27 is connected to, for example, the signal connector 102 of the battery pack 100 and the accessories 29 via a signal line.
  • the thermistor 28 is connected to, for example, the temperature detection circuit of the electronic circuit board 27 via a temperature detection line 28a.
  • the thermistor 28 is disposed, for example, in contact with the terminal surfaces 1a of some of the secondary batteries 1 of each battery line L1, and measures the temperature of the secondary batteries 1.
  • the bus bar 21 is supported by the bus bar case 26.
  • the bus bar 21 is joined by laser welding to the external terminal 1P of the positive electrode of the adjacent secondary battery 1 and the external terminal 1N of the negative electrode of the other secondary battery 1
  • the secondary batteries 1 to be connected are connected in series.
  • the voltage detection line V1 is supported, for example, by the bus bar case 26 and connected to the voltage detection circuits of the several bus bars 21 and the electronic circuit board 27.
  • FIG. 6 is a plan view showing a state in which accessories 29 are disposed inside housing 10 shown in FIG.
  • FIG. 7 is a cross-sectional view taken along the line VII-VII shown in FIG.
  • the battery pack 100 of the present embodiment is provided inside the housing 10 so as to be biased toward the side wall 10b on the front side in the short direction, and the accessory housing space S2 adjacent to the battery housing space S1 is Have.
  • accessories 29 of battery pack 100 are arranged, for example, in accessory accommodation space S2.
  • the accessory 29 includes, for example, a junction box.
  • reinforcement portion 30 is disposed in accessory housing space S2, extends in the longitudinal direction of housing 10 from one end to the other end of battery housing space S1, and is offset from center C of housing 10 in the lateral direction. It is arranged. More specifically, the battery housing space S1 is provided on the rear side in the depth direction of the housing 10, and the reinforcing portion 30 is disposed on the front side of the center C in the depth direction of the housing 10 .
  • the battery housing space S1 is, in a broad sense, an area in which the battery module 20 is disposed, and as described above, three side walls 10a, 10c, 10d, one side in the short direction of the housing 10 and both sides in the longitudinal direction.
  • the space is defined by the bottom wall 10 e and the cover 12 and the bus bar case 26 made of resin and disposed to face the terminal surface 1 a of the secondary battery 1.
  • both ends of the reinforcing portion 30 are in contact with both side walls 10 c and 10 d of the housing 10 in the longitudinal direction of the housing 10.
  • the reinforcing portion 30 extends from one end to the other end of the battery housing space S1 in the longitudinal direction of the housing 10.
  • battery accommodation space S1 is a space in which the secondary battery 1 is accommodated in a narrow sense. That is, battery accommodation space S1 is a field where battery row L1 of two rows or multiple rows of battery modules 20 is arranged, for example. More specifically, battery housing space S1 is defined by, for example, rear side wall 10a in the depth direction of housing 10, and end plate 23, side plate 24, center plate 25 and bus bar case 26 of battery module 20. Space. In this case, both end portions of the reinforcing portion 30 in the longitudinal direction of the housing 10 extend outward beyond both end portions of the plurality of battery housing spaces S1 aligned in the longitudinal direction of the housing 10.
  • the reinforcing portion 30 is disposed to face the terminal surface 1 a of the secondary battery 1 via the component parts of the battery module 20 such as the bus bar case 26 and the bus bar 21. Further, the reinforcing portion 30 is directly disposed on the top surface of the bottom wall 10 e of the housing 10 as shown in FIGS. 5 and 4, or of the bottom wall 10 e of the housing 10 as shown in FIG. It is disposed on the upper surface via a sheet-like or plate-like member. In addition, reinforcing portion 30 is arranged at a position most biased to battery housing space S1 in auxiliary machine housing space S2, for example, between reinforcing member 30 and side wall 10b on the front side in the depth direction of housing 10. Auxiliary machinery 29 such as a junction box is disposed.
  • FIG. 8 is a perspective view of the reinforcing portion 30 disposed in the housing 10 shown in FIG.
  • the reinforcing portion 30 is, for example, a solid columnar, beam-like or rod-like member having no hollow inside.
  • the material of the reinforcing portion 30 is, for example, a metal material such as stainless steel or aluminum alloy.
  • the cross-sectional shape of the reinforcing portion 30 is rectangular, and a concave stress concentration portion 31 is provided on the surface of the reinforcing portion 30 facing the battery accommodation space S1.
  • the reinforcing portion 30 has two stress concentration portions 31 in the extending direction, that is, in the longitudinal middle portion of the housing 10.
  • the stress concentration portion 31 may be singular or three or more.
  • the stress concentration portion 31 is a recess provided in the reinforcing portion 30. More specifically, the stress concentration portion 31 is formed to be recessed forward in the depth direction of the housing 10 from the surface of the reinforcing portion 30 facing the battery storage space S1. As shown in FIG. 2, the opening 31 a of the stress concentration portion 31 is opened in the surface of the reinforcing portion 30 facing the battery accommodation space S1. The bottom surface 31 b of the stress concentration portion 31 is provided at a predetermined depth position forward in the depth direction of the housing 10 from the opening 31 a substantially in parallel with the surface facing the battery accommodation space S1 of the reinforcing portion 30.
  • the stress concentration portion 31 has inclined surfaces 31 c at both end portions in the longitudinal direction of the housing 10 and has a substantially trapezoidal shape in a plan view.
  • the stress concentration portion 31 is also a notch provided in the reinforcing portion 30. More specifically, the stress concentration portion 31 is formed by cutting a part of the portion of the reinforcing portion 30 facing the battery storage space S1 forward in the depth direction of the housing 10. Further, in the example shown in FIG. 8, the stress concentration portion 31 is also a thin portion provided in the reinforcing portion 30. That is, the stress concentration portion 31 is a portion in which the thickness of the reinforcing portion 30 in the depth direction of the housing 10 is thinner than the other portions of the reinforcing portion 30.
  • the stress concentration portion 31 is provided at a position facing at least a part of the components of the battery module 20 protruding toward the reinforcing portion 30.
  • at least a part of the components of the battery module 20 facing the reinforcing portion 30 is disposed inside the concave stress concentration portion 31.
  • concave stress concentration portion 31 is provided, for example, at a position facing at least one of thermistor 28, which is a component of battery module 20, bus bar 21, and voltage detection line V1. There is.
  • the reinforcing portion 30 has screw holes 32 at both ends in the extending direction, ie, the longitudinal direction of the housing 10.
  • the reinforcing portion 30 is fixed to the side walls 10c and 10d at both ends in the longitudinal direction of the housing 10 by bolts passing through the side walls 10c and 10d at both ends in the longitudinal direction of the housing 10 be able to.
  • the reinforcing portion 30 has recesses 33 and 34 on the upper and lower surfaces in the height direction of the housing 10 respectively, and has through holes 35 at positions corresponding to the recesses 33 and 34. ing.
  • a protruding tab portion 23a is disposed.
  • the recess 34 on the upper surface of the reinforcing portion 30 is provided, for example, to avoid interference with the accessories 29 and the components of the battery module 20.
  • the tab portion 23a of the end plate 23 of the battery module 20 and the bottom wall 10e of the housing 10 have through holes at positions corresponding to the through holes 35 of the reinforcing portion 30, for example.
  • the reinforcing portion 30 has a through hole in the bottom wall 10 e of the housing 10, a through hole in the tab portion 23 a of the end plate 23 of the battery module 20, and the reinforcing portion 30 in the portion where the recess 33 is provided on the lower surface.
  • the bolt is fixed to the bottom wall 10 e of the housing 10 by fastening a nut to a bolt inserted into the through hole 35.
  • the reinforcing portion 30 fastens a nut to a bolt inserted through the through hole of the bottom wall 10 e of the housing 10 and the through hole 35 of the reinforcing portion 30 at a portion where the recess 34 is provided on the upper surface.
  • the reinforcing portion 30 fastens a nut to a bolt inserted through the through hole of the bottom wall 10 e of the housing 10 and the through hole 35 of the reinforcing portion 30 at a portion where the recess 34 is provided on the upper surface.
  • the reinforcing portion 30 has chamfers 36 and 36 on the lower surface of both end portions in the extending direction, that is, both end portions in the longitudinal direction of the housing 10.
  • the chamfered portion 36 has an inclined surface 36 a that is inclined so as to gradually approach the bottom wall 10 e of the housing 10 from the outside to the inside in the longitudinal direction of the housing 10.
  • the chamfered portion 36 prevents interference between both end portions of the reinforcing portion 30 and the corner portions between the side walls 10c and 10d of the housing 10 and the bottom wall 10e, and the reinforcing portion 30 is formed on the bottom wall 10e of the housing 10. It can be placed stably on top.
  • the battery pack 100 of the present embodiment is mounted on a vehicle such as an electric car or a hybrid car, for example.
  • the signal connector 102 is connected to the vehicle controller, and receives information exchange and power supply via the signal connector 102.
  • Battery pack 100 stores the power supplied to high voltage terminals 101 and 101 in secondary battery 1 and supplies the power stored in secondary battery 1 to the outside through high voltage terminals 101 and 101. For example, when the vehicle collides, an external force exceeding the crushing strength of the case 10 may act on the case 10 of the battery pack 100.
  • the battery pack 100 of the present embodiment includes the housing 10 having the battery storage space S1, and the secondary battery 1 disposed in the battery storage space S1. Further, the battery pack 100 of the present embodiment has a reinforcing portion 30 extending from one end of the battery housing space S1 to the other end. As described above, the reinforcing portion 30 has the concave stress concentration portion 31 facing the battery housing space S1.
  • the housing 10 can be reinforced by the rigidity of the reinforcing portion 30 extending from one end to the other end of the housing 10. Therefore, according to battery pack 100 of the present embodiment, for example, even when an external force causing load exceeding crush load of housing 10 acts on housing 10 in the longitudinal direction of housing 10, The rigidity can suppress crushing of the housing 10. However, for example, if a load exceeding the buckling load acts on the reinforcing portion 30 in the longitudinal direction of the housing 10, the reinforcing portion 30 may be bent.
  • FIG. 9 is a perspective view showing a part of the case 10 and the accessories 29 of the battery pack 100 of FIG. 1 removed as in FIG. 2.
  • an external force exceeding the crushing load of the housing 10 acts in the longitudinal direction of the housing 10
  • a load exceeding the buckling load acts on the reinforcing portion 30, and the reinforcing portion 30 is bent.
  • An example is shown.
  • illustration of a recess and a bolt for fixing the reinforcing portion 30 to the housing 10 is omitted.
  • the reinforcing portion 30 has a concave stress concentration portion 31 facing the battery storage space S1. Therefore, when a load exceeding the buckling load acts on the reinforcing portion 30, the stress is concentrated on the concave stress concentration portion 31 facing the battery accommodation space S1, and the reinforcing portion 30 is buckled starting from the stress concentration portion 31. As shown in FIG. 9, it bends in the direction opposite to the battery housing space S1. Thereby, secondary battery 1 arranged in battery housing space S1 inside housing 10 can be protected from breakage due to deformation of reinforcing portion 30.
  • a battery module 20 in which a plurality of secondary batteries 1 are stacked in the battery housing space S1 is disposed.
  • the housing 10 can be reinforced by the reinforcing portion 30, and the battery module 20 disposed in the battery housing space S1 inside the housing 10 can be protected.
  • a plurality of secondary batteries 1 for in-vehicle use can be used. The reliability and safety of the provided battery pack 100 can be improved.
  • the flat rectangular secondary battery 1 is stacked in the thickness direction, and the wide side 1 w facing the thickness direction of the secondary battery 1 is the bottom of the housing 10 It faces the wall 10e.
  • the secondary battery 1 has the external terminals 1P and 1N on the terminal surface 1a which is one side surface along the thickness direction, and the reinforcing portion 30 is a terminal of the secondary battery 1 It faces the surface 1a. Thereby, the terminal surface 1 a of the secondary battery 1 can be protected by the reinforcing portion 30, and the reliability of the battery pack 100 can be improved.
  • the housing 10 has a height direction perpendicular to the bottom wall 10 e, a longitudinal direction perpendicular to the height direction, and a short side perpendicular to the longitudinal direction and the height direction. It has a rectangular box shape having a direction, and has an accessory storage space S2 adjacent to the battery storage space S1 in the short side direction.
  • the reinforcing portion 30 is disposed in the accessory housing space S2, extends in the longitudinal direction of the housing 10, and is disposed at a position offset from the center C in the short direction of the housing 10.
  • the accessory housing space S2 acts as a buffer.
  • the crushing of the battery housing space S1 can be suppressed to protect the secondary battery 1.
  • the reinforcing portion 30 is disposed in the accessory housing space S2 opposite to the battery housing space S1 in the short side direction of the housing 10, and is disposed at a position shifted from the center C in the short side direction of the housing 10. Therefore, the reinforcing portion 30 can be easily bent in the direction away from the battery storage space S1, and the secondary battery 1 can be protected.
  • the reinforcing portion 30 is disposed on the top surface of the bottom wall 10 e of the housing 10.
  • the bottom wall 10 e of the housing 10 can be reinforced by the reinforcing portion 30. Therefore, the reliability of the battery pack 100 can be improved by improving the crushing strength of the housing 10 and protecting the secondary battery 1 by the housing 10.
  • the reinforcing portion 30 can be supported by the bottom wall 10 e of the housing 10, and the reinforcing portion 30 can be easily fixed to the housing 10.
  • both end portions of the reinforcing portion 30 are in contact with both side walls 10 c and 10 d of the housing 10 in the longitudinal direction of the housing 10.
  • the side walls 10 c and 10 d at both ends in the longitudinal direction of the housing 10 can be reinforced by the reinforcing portion 30. Therefore, the reliability of the battery pack 100 can be improved by improving the crushing strength of the housing 10 and protecting the secondary battery 1 by the housing 10.
  • the reinforcing portion 30 can be supported by the side walls 10 c and 10 d at both ends in the longitudinal direction of the housing 10, and the reinforcing portion 30 can be easily fixed to the housing 10.
  • the battery pack 100 of the present embodiment at least a part of the components of the battery module 20 facing the reinforcing portion 30 is disposed inside the concave stress concentration portion 31.
  • the space can be effectively utilized to arrange the components, and the battery pack 100 can be miniaturized.
  • the component of the battery module 20 disposed inside the stress concentration portion 31 is the thermistor 28, the disposition of the thermistor 28 is improved, and in the case of the bus bar 21 or the voltage detection line V1, the reinforcing portion 30 and Short circuit can be prevented.
  • the stress concentration portion 31 is a recess provided in the reinforcing portion 30.
  • the recess that is the stress concentration portion 31 to be opposed to the battery accommodation space S1
  • the bottom portion of the recess that is the stress concentration portion 31 The stress is concentrated, and the reinforcing portion 30 is bent to the side opposite to the battery housing space S1.
  • secondary battery 1 arranged in battery housing space S1 inside housing 10 can be protected from breakage due to deformation of reinforcing portion 30.
  • the stress concentration portion 31 is a notch provided in the reinforcing portion 30.
  • the notch which is the stress concentration portion 31 to be opposed to the battery accommodation space S1
  • the notch which is the stress concentration portion 31 The stress is concentrated at the bottom, and the reinforcing portion 30 is bent to the side opposite to the battery housing space S1.
  • secondary battery 1 arranged in battery housing space S1 inside housing 10 can be protected from breakage due to deformation of reinforcing portion 30.
  • the stress concentration portion 31 is a thin portion provided in the reinforcing portion 30.
  • the reinforcing portion 30, which is the stress concentration portion 31 to face the battery housing space S1
  • the thin portion, which is the stress concentration portion 31 when a load exceeding the buckling load acts on the reinforcement portion 30, the thin portion, which is the stress concentration portion 31.
  • the stress is concentrated on the side wall, and the reinforcing portion 30 bends to the side opposite to the battery housing space S1.
  • secondary battery 1 arranged in battery housing space S1 inside housing 10 can be protected from breakage due to deformation of reinforcing portion 30.
  • the battery pack 100 capable of protecting the unit cells inside the housing 10 while suppressing the crushing of the housing 10.
  • the battery pack 100 which concerns on this invention is not limited to the structure of the battery pack 100 which concerns on the above-mentioned embodiment.
  • modifications of the battery pack 100 according to the embodiment will be described.
  • FIG. 10 is a cross-sectional view showing a cross-sectional shape of the reinforcing portion 30 shown in FIG. 8 and a modification thereof.
  • the reinforcing portion 30 may be a hollow cylindrical shape having the hollow portion 37 inside, and the channel shape having a U-shaped cross section, the angle having an L-shaped cross section, or the H-shaped cross section It may be a shaped or I-shaped beam-shaped member or a plate-shaped member.
  • FIG. 11 is an enlarged plan view showing the shape of the stress concentration portion 31 of the reinforcing portion 30 shown in FIG. 8 and a modification thereof.
  • the stress concentration portion 31 may be, for example, an arc-shaped, U-shaped, or V-shaped recess or notch provided in the reinforcing portion 30, and even if it is a slit provided in the reinforcing portion 30. Good.
  • the stress concentration portion 31 having such a shape, the buckling strength and bending direction of the reinforcing portion 30 can be appropriately adjusted.
  • FIG. 12 is a plan view showing a modified example of the stress concentration portion 31 of the reinforcing portion 30 shown in FIG.
  • the stress concentration portion 31 may be, for example, a bending portion or a bending portion provided by bending or bending the reinforcing portion 30.
  • the stress concentration portion 31 is a portion facing the battery housing space S1 of the reinforcing portion 30 to form a concave shape, and more specifically, is a concave bottom portion of the reinforcing portion 30.
  • FIG. 13 is a perspective view showing a modification of the reinforcing portion 30 shown in FIG.
  • the reinforcing portion 30 may be a rib integrally provided on the housing 10.
  • the reinforcing portion 30 is provided by causing a part of the bottom wall 10 e of the housing 10 to protrude in the height direction of the housing 10.
  • the embodiment of the battery pack according to the present invention is not limited to the configuration in which a plurality of secondary batteries and battery modules are disposed in the battery accommodation space, and a configuration in which one secondary battery is disposed in the battery accommodation space 1 is included in an embodiment of a battery pack according to the present invention.

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Abstract

The present invention provides a cell pack capable of preventing a housing from being crushed while protecting a single cell inside the housing. A cell pack 100 includes a housing 10 having a cell storage space S1 and secondary cells 1 stored in the cell storage space S1. The cell pack 100 has a reinforcing material 30 extending from one end to the other end of the cell storage space S1. The reinforcing material 30 has a recessed stress riser 31 facing the cell storage space S1.

Description

電池パックBattery pack
　本発明は、複数の単電池を備えた電池パックに関する。 The present invention relates to a battery pack provided with a plurality of single cells.
　従来から電池モジュールの筐体を補強するための補強部を有する組電池に関する発明が知られている（下記特許文献１を参照）。 The invention regarding the assembled battery which has the reinforcement part for reinforcing the housing | casing of a battery module conventionally is known (refer the following patent document 1).
　特許文献１に記載された組電池は、複数の電池モジュールを積層させた電池モジュール群を備えている。電池モジュールは、電極端子同士を電気的に接続した複数の扁平型電池を積層して筐体内に収納することによって構成されている。扁平型電池は、発電要素を封止する外装材から電極端子が外部に導出されている。この特許文献１に記載された組電池は、電池モジュール内の扁平型電池の電極端子に対応する位置に、筐体を補強するための補強部を有することを特徴としている（同文献、請求項１等を参照）。 The assembled battery described in Patent Document 1 includes a battery module group in which a plurality of battery modules are stacked. The battery module is configured by stacking a plurality of flat type batteries in which electrode terminals are electrically connected to each other and storing the stacked battery in a housing. In the flat battery, an electrode terminal is led to the outside from an exterior material that seals the power generation element. The battery assembly described in Patent Document 1 is characterized in that a reinforcing portion for reinforcing the housing is provided at a position corresponding to the electrode terminal of the flat battery in the battery module (the same document, Claims) See 1).
　特許文献１に記載された組電池によれば、電池モジュール内の扁平型電池の電極端子に対応して補強部が設けられるため、扁平型電池の電極端子の振動を低減させ、寿命の低下を防止できる（同文献、第０００６段落等を参照）。 According to the battery pack described in Patent Document 1, since the reinforcing portion is provided corresponding to the electrode terminal of the flat battery in the battery module, the vibration of the electrode terminal of the flat battery is reduced and the life is reduced. (See the same document, paragraph 0006, etc.).
特開２００７－１０３３４４号公報JP 2007-103344 A
　前記従来の組電池のように、複数の単電池を備えた電池パックは、たとえば電気自動車やハイブリッド自動車などの車両に搭載され、たとえば車両の衝突時などに、筐体に大きな力が作用することが考えられる。このような場合であっても、筐体の圧壊を抑制し、筐体の内部の単電池を保護することが求められている。 As in the conventional battery pack, a battery pack provided with a plurality of single cells is mounted on a vehicle such as an electric car or a hybrid car, for example, and a large force acts on the housing at the time of a collision of the vehicle, for example. Is considered. Even in such a case, it is required to suppress the crushing of the housing and to protect the unit cells inside the housing.
　本発明の一態様は、筐体の圧壊を抑制するとともに、筐体の内部の単電池を保護することが可能な電池パックを提供する。 One aspect of the present invention provides a battery pack capable of preventing crushing of a housing and protecting single cells in the housing.
　本発明の一態様は、電池収容スペースを有する筐体と、該電池収容スペースに配置された二次電池とを備えた電池パックであって、前記電池収容スペースの一端から他端まで延びる補強部を有し、前記補強部は、前記電池収容スペースに対向する凹状の応力集中部を有することを特徴とする電池パックである。 One aspect of the present invention is a battery pack including a housing having a battery housing space and a secondary battery disposed in the battery housing space, wherein a reinforcing portion extends from one end of the battery housing space to the other end The battery pack is characterized in that the reinforcing portion has a concave stress concentration portion facing the battery housing space.
　上記一態様の電池パックは、筐体の内部の電池収容スペースの一端から他端まで延びる補強部の剛性によって筐体を補強し、電池収容スペースの一端から他端へ向かう方向の外力が筐体に作用したときに、筐体の圧壊を抑制することができる。 In the battery pack according to the above aspect, the housing is reinforced by the rigidity of the reinforcing portion extending from one end to the other end of the battery housing space inside the housing, and the external force in the direction from one end to the other end of the battery housing space is the housing When it acts on, it can control the collapse of the case.
　また、補強部は、電池収容スペースに対向する凹状の応力集中部を有している。そのため、補強部に座屈荷重を超える荷重が作用すると、電池収容スペースに対向する凹状の応力集中部に応力が集中して、補強部が応力集中部と反対側すなわち電池収容スペースから離れる方向へ座屈する。これにより、筐体の内部の電池収容スペースに配置された二次電池を、補強部の変形による破壊から保護することができる。 Further, the reinforcing portion has a concave stress concentration portion facing the battery housing space. Therefore, when a load exceeding the buckling load acts on the reinforcing portion, stress concentrates on the concave stress concentration portion facing the battery accommodation space, and the reinforcement portion is on the opposite side to the stress concentration portion, ie, in a direction away from the battery accommodation space. To buckle. Thereby, the secondary battery disposed in the battery accommodating space inside the housing can be protected from the destruction due to the deformation of the reinforcing portion.
　本発明の一態様によれば、筐体の圧壊を抑制するとともに、筐体の内部の単電池を保護することが可能な電池パックを提供することができる。 According to one aspect of the present invention, it is possible to provide a battery pack capable of preventing crushing of the housing and protecting single cells in the housing.
本発明の一実施形態に係る電池パックの外観斜視図。BRIEF DESCRIPTION OF THE DRAWINGS The external appearance perspective view of the battery pack which concerns on one Embodiment of this invention. 図１の電池パックの筐体の一部と補機類を取り外した状態を示す斜視図。The perspective view which shows the state which removed some housings and auxiliary machinery of the battery pack of FIG. 図１の電池パックの複数の二次電池の積層状態を示す斜視図。FIG. 2 is a perspective view showing a stacked state of a plurality of secondary batteries of the battery pack of FIG. 1. 図２のIV-IV線に沿う断面で切断した状態を示す斜視図。The perspective view which shows the state cut | disconnected in the cross section which follows the IV-IV line of FIG. 図４に示す二点鎖線で囲まれた領域Vの拡大図。The enlarged view of the area | region V enclosed with the dashed-two dotted line shown in FIG. 図２に示す筐体の内部に補機類が配置された状態を示す平面図。The top view which shows the state by which auxiliary machinery is arrange | positioned inside the housing | casing shown in FIG. 図６に示すVII－VII線に沿う断面図。Sectional drawing which follows the VII-VII line shown in FIG. 図２に示す筐体内に配置された補強部の斜視図。FIG. 3 is a perspective view of a reinforcing portion disposed in the housing shown in FIG. 2; 図１の電池パックの筐体の一部と補機類を取り外した状態を示す斜視図。The perspective view which shows the state which removed some housings and auxiliary machinery of the battery pack of FIG. 図８に示す補強部の断面形状およびその変形例を示す断面図。Sectional drawing which shows the cross-sectional shape of the reinforcement part shown in FIG. 8, and its modification. 図８に示す補強部の応力集中部の形状およびその変形例を示す拡大平面図。The enlarged plan view which shows the shape of the stress concentration part of the reinforcement part shown in FIG. 8, and its modification. 図８に示す補強部の応力集中部の形状およびその変形例を示す平面図。The top view which shows the shape of the stress concentration part of the reinforcement part shown in FIG. 8, and its modification. 図８に示す補強部の変形例を示す斜視面図。The perspective view which shows the modification of the reinforcement part shown in FIG.
　以下、図面を参照して本発明に係る電池パックの一実施形態を説明する。 Hereinafter, an embodiment of a battery pack according to the present invention will be described with reference to the drawings.
　図１は、本発明の一実施形態に係る電池パック１００の外観斜視図である。図２は、図１の電池パック１００の筐体１０の一部と補機類を取り外した状態の斜視図である。図３は、図１の電池パック１００の筐体１０に収容された複数の二次電池１の積層状態を示す斜視図である。図４は、図２のIV-IV線に沿う断面で切断した状態を示す斜視図である。図５は、図４に示す一点鎖線で囲まれた領域Vの拡大図である。 FIG. 1 is an external perspective view of a battery pack 100 according to an embodiment of the present invention. FIG. 2 is a perspective view of the battery pack 100 of FIG. 1 from which a part of the case 10 and accessories are removed. FIG. 3 is a perspective view showing a stacked state of the plurality of secondary batteries 1 accommodated in the housing 10 of the battery pack 100 of FIG. FIG. 4 is a perspective view showing a state of being cut at a cross section taken along line IV-IV of FIG. FIG. 5 is an enlarged view of a region V surrounded by an alternate long and short dash line shown in FIG.
　本実施形態の電池パック１００は、電池収容スペースＳ１を有する筐体１０と、この筐体１０の内部の電池収容スペースＳ１に配置された二次電池１とを備えている。詳細については後述するが、本実施形態の電池パック１００は、電池収容スペースＳ１の一端から他端まで延びる補強部３０を有し、この補強部３０が、電池収容スペースＳ１に対向する凹状の応力集中部３１を有することを特徴としている。 The battery pack 100 according to the present embodiment includes a housing 10 having a battery storage space S1, and the secondary battery 1 disposed in the battery storage space S1 inside the housing 10. Although details will be described later, the battery pack 100 of the present embodiment has a reinforcing portion 30 extending from one end of the battery housing space S1 to the other end, and the reinforcing portion 30 has a concave stress facing the battery housing space S1. It is characterized by having a concentration unit 31.
　筐体１０は、たとえば、おおむね直方体形状の矩形箱形の形状を有している。各図に、筐体１０の奥行方向をＸ軸、幅方向をＹ軸、高さ方向をＺ軸とする直交座標系を示す。筐体１０は、幅方向の寸法が奥行方向の寸法よりも大きくなっている。すなわち、筐体１０は、底壁に垂直な高さ方向（Ｚ軸方向）と、この高さ方向に垂直な長手方向（Ｙ軸方向）と、これら長手方向および高さ方向に垂直な短手方向（Ｘ軸方向）と、を有する矩形箱形の形状に形成されている。 The housing 10 has, for example, a substantially rectangular parallelepiped rectangular box shape. Each drawing shows an orthogonal coordinate system in which the depth direction of the housing 10 is the X axis, the width direction is the Y axis, and the height direction is the Z axis. The housing 10 has a dimension in the width direction larger than a dimension in the depth direction. That is, the housing 10 has a height direction (Z-axis direction) perpendicular to the bottom wall, a longitudinal direction (Y-axis direction) perpendicular to the height direction, and short sides perpendicular to the longitudinal direction and the height direction. It is formed in the shape of a rectangular box having a direction (X-axis direction).
　筐体１０は、たとえば、上部が開放された矩形箱状の本体部１１と、本体部１１の上部の開口１１ａを覆うカバー１２とを有している。本体部１１の素材は、たとえば、電気亜鉛めっき鋼鈑などの金属材料であり、カバー１２の素材は、たとえば、ポリブチレンテレフタレート（ＰＢＴ）などの樹脂材料である。筐体１０のカバー１２の短手方向の一端で長手方向の両端には、電池パック１００の正極および負極の外部端子である一対の高電圧端子１０１，１０１が設けられている。また、筐体１０のカバーの高電圧端子１０１，１０１が設けられた短手方向の一端には、筐体１０の長手方向において一対の高電圧端子１０１，１０１の内側で一方の高電圧端子１０１に隣接する位置に、信号コネクタ１０２が設けられている。 The housing 10 has, for example, a rectangular box-shaped main body 11 whose upper portion is opened, and a cover 12 which covers the opening 11 a of the upper portion of the main body 11. The material of the main body 11 is, for example, a metal material such as electrogalvanized steel plate, and the material of the cover 12 is, for example, a resin material such as polybutylene terephthalate (PBT). A pair of high voltage terminals 101 and 101 which are external terminals of the positive electrode and the negative electrode of the battery pack 100 are provided at one end in the short direction of the cover 12 of the housing 10 and at both ends in the longitudinal direction. Further, at one end in the short direction of the cover 10 where the high voltage terminals 101 and 101 of the cover of the housing 10 are provided, one high voltage terminal 101 inside the pair of high voltage terminals 101 and 101 in the longitudinal direction of the housing 10 A signal connector 102 is provided at a position adjacent to.
　電池収容スペースＳ１は、筐体１０の内部の二次電池１を収容するための領域、空間、区画または収容部である。電池収容スペースＳ１は、たとえば、筐体１０の短手方向の一方の側壁１０ａに隣接し、筐体１０の短手方向の片側に偏って設けられている。電池収容スペースＳ１は、たとえば、筐体１０の短手方向の片側と長手方向の両側の三方の側壁１０ａ，１０ｃ，１０ｄ、底壁１０ｅおよびカバー１２と、二次電池１の端子面１ａに対向して配置される樹脂製のバスバーケース２６とによって囲まれて画定された空間である。 The battery housing space S1 is a region, space, section or housing portion for housing the secondary battery 1 inside the housing 10. For example, the battery housing space S1 is adjacent to one side wall 10a in the short direction of the housing 10, and is provided on one side in the short direction of the housing 10. Battery housing space S1 faces, for example, three side walls 10a, 10c, 10d on one side of housing 10 and both sides in the longitudinal direction, bottom wall 10e and cover 12, and terminal surface 1a of secondary battery 1. It is a space defined by being surrounded by the resin-made bus bar case 26 which is disposed.
　本実施形態の電池パック１００は、電池収容スペースＳ１に複数の二次電池１を積層させた電池モジュール２０が配置されている。 In a battery pack 100 of the present embodiment, a battery module 20 in which a plurality of secondary batteries 1 are stacked in a battery housing space S1 is disposed.
　図３に示すように、電池モジュール２０を構成する個々の二次電池１は、たとえば、偏平角形のリチウムイオン二次電池である。二次電池１は、厚さ方向の両側に最も面積の大きい長方形の広側面１ｗを有し、広側面１ｗの短手方向の一端と他端にそれぞれ細長い長方形の底面１ｂと端子面１ａを有し、広側面１ｗの長手方向の両端に最も面積の小さい狭側面１ｎを有している。二次電池１は、厚さ方向に沿う一側面である端子面１ａに、外部端子１Ｐ，１Ｎを有している。より具体的には、二次電池１の端子面１ａの長手方向の一端と他端に離隔して、それぞれ、正極と負極の外部端子１Ｐ，１Ｎが設けられている。 As shown in FIG. 3, each of the secondary batteries 1 constituting the battery module 20 is, for example, a flat rectangular lithium ion secondary battery. The secondary battery 1 has a wide rectangular side surface 1w having the largest area on both sides in the thickness direction, and has a long rectangular bottom surface 1b and a terminal surface 1a at one end and the other end in the short side direction of the wide side surface 1w. The narrow side 1 n has the smallest area at both ends in the longitudinal direction of the wide side 1 w. The secondary battery 1 has external terminals 1P and 1N on a terminal surface 1a which is one side surface along the thickness direction. More specifically, external terminals 1P and 1N of a positive electrode and a negative electrode are provided at one end and the other end in the longitudinal direction of the terminal surface 1a of the secondary battery 1, respectively.
　電池モジュール２０は、偏平角形の二次電池１が厚さ方向に積層され、二次電池１の厚さ方向を向く広側面１ｗが筐体１０の底壁１０ｅに対向している。電池モジュール２０は、たとえば、厚さ方向に積層された複数の二次電池１からなる二列または二列以上の複数列の電池列Ｌ１を有している。二列または複数列の電池列Ｌ１は、たとえば、各電池列Ｌ１を構成する二次電池１の端子面１ａの長手方向に並んでいる。 In the battery module 20, the flat rectangular secondary battery 1 is stacked in the thickness direction, and a wide side surface 1 w facing the thickness direction of the secondary battery 1 faces the bottom wall 10 e of the housing 10. The battery module 20 has, for example, two or more rows of battery rows L1 composed of a plurality of secondary batteries 1 stacked in the thickness direction. The two or more battery lines L1 are arranged, for example, in the longitudinal direction of the terminal surface 1a of the secondary battery 1 constituting each battery line L1.
　電池モジュール２０の各電池列Ｌ１を構成するすべての二次電池１の端子面１ａは、一方向すなわち電池パック１００の筐体１０の奥行方向前方（Ｘ軸正方向）を向いている。積層方向に隣り合う二つの二次電池１は、交互に１８０度反転させて配置されている。これにより、積層方向に隣り合う二つの二次電池１は、一方の二次電池１の正極の外部端子１Ｐと、他方の二次電池１の負極の外部端子１Ｎとが、二次電池１の積層方向において隣り合っている。 The terminal surfaces 1a of all the secondary batteries 1 constituting each battery column L1 of the battery module 20 are directed in one direction, that is, forward in the depth direction (X-axis positive direction) of the case 10 of the battery pack 100. Two secondary batteries 1 adjacent to each other in the stacking direction are alternately arranged to be inverted by 180 degrees. Thus, in the two secondary batteries 1 adjacent in the stacking direction, the external terminal 1P of the positive electrode of one secondary battery 1 and the external terminal 1N of the negative electrode of the other secondary battery 1 Adjacent in the stacking direction.
　電池モジュール２０は、たとえば、複数の二次電池１が、各電池列Ｌ１の積層方向の一端に配置された二次電池１から積層方向の他端に配置された二次電池１まで、バスバー２１によって直列に接続されている。より具体的には、電池モジュール２０は、積層方向に互いに隣り合う二つの二次電池１のうち、一方の二次電池１の正極の外部端子１Ｐと他方の二次電池１の負極の外部端子１Ｎとを、バスバー２１によって積層方向に順次接続していくことによって、複数の二次電池１が直列に接続されている。なお、電池モジュール２０は、たとえば、複数の電池列Ｌ１がバスバー２１によって直列または並列に接続されていてもよい。 In battery module 20, for example, bus bar 21 from secondary battery 1 arranged at one end in the stacking direction of each battery row L1 to secondary battery 1 arranged at the other end in the stacking direction. Connected in series. More specifically, battery module 20 has an external terminal 1P of the positive electrode of one secondary battery 1 and an external terminal of the negative electrode of the other secondary battery 1 among two secondary batteries 1 adjacent to each other in the stacking direction. The plurality of secondary batteries 1 are connected in series by sequentially connecting 1N with the bus bar 21 in the stacking direction. Note that, in the battery module 20, for example, a plurality of battery lines L1 may be connected in series or in parallel by the bus bar 21.
　電池モジュール２０は、個々の二次電池１の厚さ方向の両側に、広側面１ｗに対向するセルホルダ２２を有している。セルホルダ２２は、二次電池１の広側面１ｗに対向する面に、広側面１ｗに当接する複数の凸部２２ａを有し、二次電池１の積層方向に二次電池１と交互に積層され、個々の二次電池１を厚さ方向の両側から保持している。二次電池１の積層方向における両端部のセルホルダ２２は、二次電池１と反対側が平坦な面になっている。セルホルダ２２は、たとえば、ＰＢＴなどの電気絶縁性を有する樹脂材料を素材とする射出成形によって製作することができる。 The battery module 20 has cell holders 22 facing the wide side 1 w on both sides in the thickness direction of the individual secondary batteries 1. The cell holder 22 has a plurality of convex portions 22a in contact with the wide side surface 1w on the surface facing the wide side surface 1w of the secondary battery 1, and is alternately stacked with the secondary battery 1 in the stacking direction of the secondary battery 1 The individual secondary batteries 1 are held from both sides in the thickness direction. The cell holders 22 at both ends in the stacking direction of the secondary battery 1 have flat surfaces on the side opposite to the secondary battery 1. The cell holder 22 can be manufactured, for example, by injection molding using a resin material having electrical insulation such as PBT as a material.
　電池モジュール２０は、たとえば、二次電池１と、バスバー２１と、セルホルダ２２と、エンドプレート２３と、サイドプレート２４と、センタープレート２５と、バスバーケース２６と、電子回路基板２７と、サーミスタ２８（図５参照）と、電圧検出線Ｖ１と、補機類２９（図６参照）と、を備えている。なお、図２では、電子回路基板２７を透視してバスバーケース２６の構成を示している。 For example, the battery module 20 includes the secondary battery 1, the bus bar 21, the cell holder 22, the end plate 23, the side plate 24, the center plate 25, the bus bar case 26, the electronic circuit board 27, and the thermistor 28 5), a voltage detection line V1, and accessories 29 (see FIG. 6). In FIG. 2, the configuration of the bus bar case 26 is shown through the electronic circuit board 27.
　バスバー２１は、二次電池１の外部端子１Ｐ，１Ｎに接続される金属製の板状の部材である。一対のエンドプレート２３は、たとえば、金属製の板状の部材であり、二次電池１の積層方向における両端部のセルホルダ２２の外側に配置され、複数のセルホルダ２２を介して複数の二次電池１を積層方向の両側から挟持している。 The bus bar 21 is a metal plate-like member connected to the external terminals 1P and 1N of the secondary battery 1. The pair of end plates 23 is, for example, a metal plate-like member, and is disposed outside the cell holders 22 at both ends in the stacking direction of the secondary battery 1, and a plurality of secondary batteries via the plurality of cell holders 22. 1 is held from both sides in the stacking direction.
　サイドプレート２４は、たとえば、金属製の板状の部材であり、二次電池１の端子面１ａの長手方向に並んだ二列または複数列の電池列Ｌ１の配列方向における両端に配置され、セルホルダ２２の一部など電気絶縁性を有する樹脂部材を介して二次電池１の狭側面１ｎに対向している。一対のサイドプレート２４は、たとえば、筐体１０の高さ方向の上下の端部にねじ穴を有し、ボルトによってエンドプレート２３に固定されている。 The side plate 24 is, for example, a metal plate-like member, and is disposed at both ends in the arrangement direction of the two or more battery rows L1 arranged in the longitudinal direction of the terminal surface 1a of the secondary battery 1 It faces the narrow side surface 1 n of the secondary battery 1 through a resin member having an electrical insulation property such as a part of 22. The pair of side plates 24 has screw holes at upper and lower ends in the height direction of the housing 10, for example, and is fixed to the end plate 23 by bolts.
　センタープレート２５は、たとえば、金属製の板状の部材であり、電池列Ｌ１と電池列Ｌ１の間に配置され、セルホルダ２２の一部など電気絶縁性を有する樹脂部材を介して二次電池１の狭側面１ｎに対向している。電池列Ｌ１が二列の場合には、一つのセンタープレート２５が電池列Ｌ１の間に配置され、電池列Ｌ１が三列以上の場合には、二つ以上のセンタープレート２５が電池列Ｌ１の間に配置される。センタープレート２５は、たとえば、筐体１０の高さ方向の上下の端部にねじ穴を有し、ボルトによってエンドプレート２３に固定されている。 Center plate 25 is, for example, a plate-like member made of metal, is disposed between battery row L1 and battery row L1, and secondary battery 1 via a resin member having electrical insulation such as a part of cell holder 22. Opposite the narrow side 1 n of the When battery row L1 is in two rows, one center plate 25 is disposed between battery rows L1. When battery row L1 is in three or more rows, two or more center plates 25 are in battery row L1. Placed in between. The center plate 25 has, for example, screw holes at upper and lower ends in the height direction of the housing 10 and is fixed to the end plate 23 by bolts.
　バスバーケース２６は、たとえば、電気絶縁性を有する樹脂製の板状または枠状の部材であり、電池モジュール２０を構成する複数の二次電池１の端子面１ａに対向して配置されている。バスバーケース２６は、たとえば、複数の二次電池１の外部端子１Ｐ，１Ｎに対応する位置に開口部を有し、その開口部の周囲に設けられた支持部にバスバー２１を支持するとともに、隣接するバスバー２１の間を隔壁によって電気的に絶縁している。 The bus bar case 26 is, for example, a plate-like or frame-like member made of an electrically insulating resin and is disposed to face the terminal surfaces 1 a of the plurality of secondary batteries 1 constituting the battery module 20. The bus bar case 26 has an opening at a position corresponding to the external terminals 1P and 1N of the plurality of secondary batteries 1, for example, and supports the bus bar 21 on a support provided around the opening and is adjacent The bus bars 21 are electrically isolated by the partition walls.
　電子回路基板２７は、たとえば、バスバーケース２６に固定され、バスバーケース２６を介して二次電池１の端子面１ａに対向して配置されている。電子回路基板２７は、たとえば、電圧検出回路、温度検出回路、および制御回路等を備えている。電子回路基板２７は、たとえば、信号線を介して電池パック１００の信号コネクタ１０２や補機類２９に接続されている。 The electronic circuit board 27 is fixed to, for example, the bus bar case 26 and disposed so as to face the terminal surface 1 a of the secondary battery 1 via the bus bar case 26. The electronic circuit board 27 includes, for example, a voltage detection circuit, a temperature detection circuit, and a control circuit. The electronic circuit board 27 is connected to, for example, the signal connector 102 of the battery pack 100 and the accessories 29 via a signal line.
　サーミスタ２８は、たとえば、温度検出線２８ａを介して電子回路基板２７の温度検出回路に接続されている。サーミスタ２８は、たとえば、各電池列Ｌ１のいくつかの二次電池１の端子面１ａに接するように配置され、二次電池１の温度を計測する。バスバー２１は、バスバーケース２６によって支持されるとともに、たとえば、隣接する一方の二次電池１の正極の外部端子１Ｐと他方の二次電池１の負極の外部端子１Ｎにレーザ溶接によって接合され、隣接する二次電池１を直列に接続する。電圧検出線Ｖ１は、たとえば、バスバーケース２６によって支持され、いくつかのバスバー２１と電子回路基板２７の電圧検出回路に接続されている。 The thermistor 28 is connected to, for example, the temperature detection circuit of the electronic circuit board 27 via a temperature detection line 28a. The thermistor 28 is disposed, for example, in contact with the terminal surfaces 1a of some of the secondary batteries 1 of each battery line L1, and measures the temperature of the secondary batteries 1. The bus bar 21 is supported by the bus bar case 26. For example, the bus bar 21 is joined by laser welding to the external terminal 1P of the positive electrode of the adjacent secondary battery 1 and the external terminal 1N of the negative electrode of the other secondary battery 1 The secondary batteries 1 to be connected are connected in series. The voltage detection line V1 is supported, for example, by the bus bar case 26 and connected to the voltage detection circuits of the several bus bars 21 and the electronic circuit board 27.
　図６は、図２に示す筐体１０の内部に補機類２９が配置された状態を示す平面図である。図７は、図６に示すVII－VII線に沿う断面図である。本実施形態の電池パック１００は、図２に示すように、筐体１０の内部に短手方向の前方側の側壁１０ｂに偏って設けられ、電池収容スペースＳ１に隣接する補機収容スペースＳ２を有している。図６および図７に示すように、電池パック１００の補機類２９は、たとえば、補機収容スペースＳ２に配置されている。補機類２９は、たとえば、ジャンクションボックスを含んでいる。 FIG. 6 is a plan view showing a state in which accessories 29 are disposed inside housing 10 shown in FIG. FIG. 7 is a cross-sectional view taken along the line VII-VII shown in FIG. As shown in FIG. 2, the battery pack 100 of the present embodiment is provided inside the housing 10 so as to be biased toward the side wall 10b on the front side in the short direction, and the accessory housing space S2 adjacent to the battery housing space S1 is Have. As shown in FIGS. 6 and 7, accessories 29 of battery pack 100 are arranged, for example, in accessory accommodation space S2. The accessory 29 includes, for example, a junction box.
　補強部３０は、たとえば、補機収容スペースＳ２に配置され、電池収容スペースＳ１の一端から他端まで筐体１０の長手方向に延び、筐体１０の短手方向の中心Ｃからずれた位置に配置されている。より具体的には、電池収容スペースＳ１は、筐体１０の奥行方向における後方側に偏って設けられ、補強部３０は、筐体１０の奥行方向における中心Ｃよりも前方側に配置されている。 For example, reinforcement portion 30 is disposed in accessory housing space S2, extends in the longitudinal direction of housing 10 from one end to the other end of battery housing space S1, and is offset from center C of housing 10 in the lateral direction. It is arranged. More specifically, the battery housing space S1 is provided on the rear side in the depth direction of the housing 10, and the reinforcing portion 30 is disposed on the front side of the center C in the depth direction of the housing 10 .
　電池収容スペースＳ１は、広義には、電池モジュール２０が配置された領域であり、前述のように、筐体１０の短手方向の片側と長手方向の両側の三方の側壁１０ａ，１０ｃ，１０ｄ、底壁１０ｅおよびカバー１２と、二次電池１の端子面１ａに対向して配置される樹脂製のバスバーケース２６とによって画定された空間である。この場合、筐体１０の長手方向において、補強部３０の両端部は、筐体１０の両側壁１０ｃ，１０ｄに接している。これにより、補強部３０は、筐体１０の長手方向において、電池収容スペースＳ１の一端から他端まで延びている。 The battery housing space S1 is, in a broad sense, an area in which the battery module 20 is disposed, and as described above, three side walls 10a, 10c, 10d, one side in the short direction of the housing 10 and both sides in the longitudinal direction. The space is defined by the bottom wall 10 e and the cover 12 and the bus bar case 26 made of resin and disposed to face the terminal surface 1 a of the secondary battery 1. In this case, both ends of the reinforcing portion 30 are in contact with both side walls 10 c and 10 d of the housing 10 in the longitudinal direction of the housing 10. Thus, the reinforcing portion 30 extends from one end to the other end of the battery housing space S1 in the longitudinal direction of the housing 10.
　また、電池収容スペースＳ１は、狭義には、二次電池１が収容されたスペースである。すなわち、電池収容スペースＳ１は、たとえば、電池モジュール２０の二列または複数列の電池列Ｌ１が配置された領域である。より具体的には、電池収容スペースＳ１は、たとえば、筐体１０の奥行方向の後方の側壁１０ａ、ならびに、電池モジュール２０のエンドプレート２３、サイドプレート２４、センタープレート２５、およびバスバーケース２６によって画定された空間である。この場合、筐体１０の長手方向における補強部３０の両端部は、筐体１０の長手方向に並んだ複数の電池収容スペースＳ１の両端部を超えて外側へ延びている。 Further, the battery accommodation space S1 is a space in which the secondary battery 1 is accommodated in a narrow sense. That is, battery accommodation space S1 is a field where battery row L1 of two rows or multiple rows of battery modules 20 is arranged, for example. More specifically, battery housing space S1 is defined by, for example, rear side wall 10a in the depth direction of housing 10, and end plate 23, side plate 24, center plate 25 and bus bar case 26 of battery module 20. Space. In this case, both end portions of the reinforcing portion 30 in the longitudinal direction of the housing 10 extend outward beyond both end portions of the plurality of battery housing spaces S1 aligned in the longitudinal direction of the housing 10.
　図６および図７に示す例において、補強部３０は、バスバーケース２６やバスバー２１などの電池モジュール２０の構成部品を介して、二次電池１の端子面１ａに対向して配置されている。また、補強部３０は、図５および図４に示すように筐体１０の底壁１０ｅの上面に直接的に配置されているか、または、図７に示すように筐体１０の底壁１０ｅの上面にシート状または板状の部材を介して配置されている。また、補強部３０は、たとえば、補機収容スペースＳ２において最も電池収容スペースＳ１に偏った位置に配置され、筐体１０の奥行方向の前方側の側壁１０ｂと補強部３０との間に、たとえばジャンクションボックス等の補機類２９が配置されている。 In the example shown in FIGS. 6 and 7, the reinforcing portion 30 is disposed to face the terminal surface 1 a of the secondary battery 1 via the component parts of the battery module 20 such as the bus bar case 26 and the bus bar 21. Further, the reinforcing portion 30 is directly disposed on the top surface of the bottom wall 10 e of the housing 10 as shown in FIGS. 5 and 4, or of the bottom wall 10 e of the housing 10 as shown in FIG. It is disposed on the upper surface via a sheet-like or plate-like member. In addition, reinforcing portion 30 is arranged at a position most biased to battery housing space S1 in auxiliary machine housing space S2, for example, between reinforcing member 30 and side wall 10b on the front side in the depth direction of housing 10. Auxiliary machinery 29 such as a junction box is disposed.
　図８は、図２に示す筐体１０内に配置された補強部３０の斜視図である。補強部３０は、たとえば、内部に空洞を有しない中実の柱状、梁状または棒状の部材である。補強部３０の素材は、たとえばステンレス鋼やアルミニウム合金などの金属材料である。図８に示す例において、補強部３０の断面形状は矩形であり、補強部３０の電池収容スペースＳ１に対向する面に凹状の応力集中部３１が設けられている。この例において、補強部３０は、延在方向すなわち筐体１０の長手方向の中間部に、二つの応力集中部３１を有している。なお、応力集中部３１は、単数でもよいし、三つ以上の複数であってもよい。 FIG. 8 is a perspective view of the reinforcing portion 30 disposed in the housing 10 shown in FIG. The reinforcing portion 30 is, for example, a solid columnar, beam-like or rod-like member having no hollow inside. The material of the reinforcing portion 30 is, for example, a metal material such as stainless steel or aluminum alloy. In the example shown in FIG. 8, the cross-sectional shape of the reinforcing portion 30 is rectangular, and a concave stress concentration portion 31 is provided on the surface of the reinforcing portion 30 facing the battery accommodation space S1. In this example, the reinforcing portion 30 has two stress concentration portions 31 in the extending direction, that is, in the longitudinal middle portion of the housing 10. The stress concentration portion 31 may be singular or three or more.
　図８に示す例において、応力集中部３１は、補強部３０に設けられた凹部である。より詳細には、応力集中部３１は、補強部３０の電池収容スペースＳ１に対向する面から、筐体１０の奥行方向の前方へ向けて窪むように形成されている。応力集中部３１の開口部３１ａは、図２に示すように、補強部３０の電池収容スペースＳ１に対向する面に開口している。応力集中部３１の底面３１ｂは、開口部３１ａから筐体１０の奥行方向の前方へ所定の深さ位置に補強部３０の電池収容スペースＳ１に対向する面とおおむね平行に設けられている。応力集中部３１は、筐体１０の長手方向の両端部に傾斜面３１ｃを有し、平面視でおおむね台形の形状を有している。 In the example shown in FIG. 8, the stress concentration portion 31 is a recess provided in the reinforcing portion 30. More specifically, the stress concentration portion 31 is formed to be recessed forward in the depth direction of the housing 10 from the surface of the reinforcing portion 30 facing the battery storage space S1. As shown in FIG. 2, the opening 31 a of the stress concentration portion 31 is opened in the surface of the reinforcing portion 30 facing the battery accommodation space S1. The bottom surface 31 b of the stress concentration portion 31 is provided at a predetermined depth position forward in the depth direction of the housing 10 from the opening 31 a substantially in parallel with the surface facing the battery accommodation space S1 of the reinforcing portion 30. The stress concentration portion 31 has inclined surfaces 31 c at both end portions in the longitudinal direction of the housing 10 and has a substantially trapezoidal shape in a plan view.
　図８に示す例において、応力集中部３１は、補強部３０に設けられた切り欠きでもある。より詳細には、応力集中部３１は、補強部３０の電池収容スペースＳ１に対向する部分の一部が、筐体１０の奥行方向の前方へ向けて切り欠かれることによって形成されている。また、図８に示す例において、応力集中部３１は、補強部３０に設けられた薄肉部でもある。すなわち、応力集中部３１は、筐体１０の奥行方向における補強部３０の肉厚が、補強部３０の他の部分よりも薄くされた部分である。 In the example shown in FIG. 8, the stress concentration portion 31 is also a notch provided in the reinforcing portion 30. More specifically, the stress concentration portion 31 is formed by cutting a part of the portion of the reinforcing portion 30 facing the battery storage space S1 forward in the depth direction of the housing 10. Further, in the example shown in FIG. 8, the stress concentration portion 31 is also a thin portion provided in the reinforcing portion 30. That is, the stress concentration portion 31 is a portion in which the thickness of the reinforcing portion 30 in the depth direction of the housing 10 is thinner than the other portions of the reinforcing portion 30.
　応力集中部３１は、たとえば、図２、図４および図５に示すように、補強部３０に向けて突出する電池モジュール２０の部品の少なくとも一部に対向する位置に設けられている。これにより、たとえば、補強部３０に対向する電池モジュール２０の部品の少なくとも一部が、凹状の応力集中部３１の内側に配置されている。より具体的には、凹状の応力集中部３１は、たとえば、電池モジュール２０の部品であるサーミスタ２８、バスバー２１、電圧検出線Ｖ１のうち、少なくともいずれか一つの部品に対向する位置に設けられている。 For example, as shown in FIGS. 2, 4 and 5, the stress concentration portion 31 is provided at a position facing at least a part of the components of the battery module 20 protruding toward the reinforcing portion 30. Thus, for example, at least a part of the components of the battery module 20 facing the reinforcing portion 30 is disposed inside the concave stress concentration portion 31. More specifically, concave stress concentration portion 31 is provided, for example, at a position facing at least one of thermistor 28, which is a component of battery module 20, bus bar 21, and voltage detection line V1. There is.
　図８に示す例において、補強部３０は、延在方向すなわち筐体１０の長手方向の両端部にねじ穴３２を有している。この場合、補強部３０は、図２に示すように、筐体１０の長手方向の両端の側壁１０ｃ，１０ｄを貫通するボルトによって、筐体１０の長手方向の両端の側壁１０ｃ，１０ｄに固定することができる。筐体１０の長手方向の両端の側壁１０ｃ，１０ｄを貫通するボルトを、補強部３０の長手方向の両端部のねじ穴３２，３２に締結することで、筐体１０の長手方向において、補強部３０の両端部は、たとえば、筐体１０の両側壁１０ｃ，１０ｄに接した状態で、筐体１０の両側壁１０ｃ，１０ｄに固定される。 In the example shown in FIG. 8, the reinforcing portion 30 has screw holes 32 at both ends in the extending direction, ie, the longitudinal direction of the housing 10. In this case, as shown in FIG. 2, the reinforcing portion 30 is fixed to the side walls 10c and 10d at both ends in the longitudinal direction of the housing 10 by bolts passing through the side walls 10c and 10d at both ends in the longitudinal direction of the housing 10 be able to. By fastening bolts penetrating through the side walls 10c and 10d at both ends in the longitudinal direction of the housing 10 to the screw holes 32 and 32 at both ends in the longitudinal direction of the reinforcing portion 30, the reinforcing portion in the longitudinal direction of the housing 10 Both end portions of 30 are fixed to both side walls 10c and 10d of the housing 10 in a state of being in contact with both side walls 10c and 10d of the housing 10, for example.
　図８に示す例において、補強部３０は、筐体１０の高さ方向における上面と下面にそれぞれ凹部３３，３４を有し、これらの凹部３３，３４に対応する位置に貫通孔３５を有している。補強部３０の下面に設けられた凹部３３には、図２に示すように、たとえば、筐体１０の底壁１０ｅに対向する電池モジュール２０のエンドプレート２３から筐体１０の奥行方向の前方に突出して設けられたタブ部２３ａが配置されている。補強部３０の上面の凹部３４は、たとえば、補機類２９や電池モジュール２０の部品との干渉を回避するために設けられている。 In the example shown in FIG. 8, the reinforcing portion 30 has recesses 33 and 34 on the upper and lower surfaces in the height direction of the housing 10 respectively, and has through holes 35 at positions corresponding to the recesses 33 and 34. ing. In the recess 33 provided on the lower surface of the reinforcing portion 30, as shown in FIG. 2, for example, from the end plate 23 of the battery module 20 facing the bottom wall 10e of the housing 10 to the front in the depth direction of the housing 10. A protruding tab portion 23a is disposed. The recess 34 on the upper surface of the reinforcing portion 30 is provided, for example, to avoid interference with the accessories 29 and the components of the battery module 20.
　電池モジュール２０のエンドプレート２３のタブ部２３ａと、筐体１０の底壁１０ｅは、たとえば、補強部３０の貫通孔３５に対応する位置に、それぞれ貫通孔を有している。補強部３０は、たとえば、下面に凹部３３が設けられた部分において、筐体１０の底壁１０ｅの貫通孔と、電池モジュール２０のエンドプレート２３のタブ部２３ａの貫通孔と、補強部３０の貫通孔３５に挿通されたボルトに、ナットを締結することによって、筐体１０の底壁１０ｅに固定されている。また、補強部３０は、たとえば、上面に凹部３４が設けられた部分において、筐体１０の底壁１０ｅの貫通孔と補強部３０の貫通孔３５に挿通されたボルトに、ナットを締結することによって、筐体１０の底壁１０ｅに固定されている。 The tab portion 23a of the end plate 23 of the battery module 20 and the bottom wall 10e of the housing 10 have through holes at positions corresponding to the through holes 35 of the reinforcing portion 30, for example. For example, the reinforcing portion 30 has a through hole in the bottom wall 10 e of the housing 10, a through hole in the tab portion 23 a of the end plate 23 of the battery module 20, and the reinforcing portion 30 in the portion where the recess 33 is provided on the lower surface. The bolt is fixed to the bottom wall 10 e of the housing 10 by fastening a nut to a bolt inserted into the through hole 35. In addition, for example, the reinforcing portion 30 fastens a nut to a bolt inserted through the through hole of the bottom wall 10 e of the housing 10 and the through hole 35 of the reinforcing portion 30 at a portion where the recess 34 is provided on the upper surface. Are fixed to the bottom wall 10 e of the housing 10.
　図８に示す例において、補強部３０は、延在方向の両端部すなわち筐体１０の長手方向の両端部の下面に面取り部３６，３６を有している。面取り部３６は、筐体１０の長手方向における外側から内側へ向けて、筐体１０の底壁１０ｅに漸次近付くように傾斜する傾斜面３６ａを有している。この面取り部３６により、補強部３０の両端部と、筐体１０の側壁１０ｃ，１０ｄと底壁１０ｅの間の角部との干渉が回避され、補強部３０を筐体１０の底壁１０ｅの上に安定して配置することができる。 In the example shown in FIG. 8, the reinforcing portion 30 has chamfers 36 and 36 on the lower surface of both end portions in the extending direction, that is, both end portions in the longitudinal direction of the housing 10. The chamfered portion 36 has an inclined surface 36 a that is inclined so as to gradually approach the bottom wall 10 e of the housing 10 from the outside to the inside in the longitudinal direction of the housing 10. The chamfered portion 36 prevents interference between both end portions of the reinforcing portion 30 and the corner portions between the side walls 10c and 10d of the housing 10 and the bottom wall 10e, and the reinforcing portion 30 is formed on the bottom wall 10e of the housing 10. It can be placed stably on top.
　以下、本実施形態の電池パック１００の作用について説明する。 Hereinafter, the operation of the battery pack 100 of the present embodiment will be described.
　本実施形態の電池パック１００は、たとえば、電気自動車やハイブリッド自動車などの車両に搭載され、信号コネクタ１０２が車両側コントローラに接続され、信号コネクタ１０２を介して情報のやり取りや電源の供給を受ける。電池パック１００は、高電圧端子１０１，１０１に供給された電力を二次電池１に蓄え、二次電池１に蓄えられた電力を、高電圧端子１０１，１０１を介して外部へ供給する。たとえば、車両の衝突時などに、電池パック１００の筐体１０に対して、筐体１０の圧壊強度を超える外力が作用するおそれがある。 The battery pack 100 of the present embodiment is mounted on a vehicle such as an electric car or a hybrid car, for example. The signal connector 102 is connected to the vehicle controller, and receives information exchange and power supply via the signal connector 102. Battery pack 100 stores the power supplied to high voltage terminals 101 and 101 in secondary battery 1 and supplies the power stored in secondary battery 1 to the outside through high voltage terminals 101 and 101. For example, when the vehicle collides, an external force exceeding the crushing strength of the case 10 may act on the case 10 of the battery pack 100.
　本実施形態の電池パック１００は、前述のように、電池収容スペースＳ１を有する筐体１０と、その電池収容スペースＳ１に配置された二次電池１とを備えている。また、本実施形態の電池パック１００は、電池収容スペースＳ１の一端から他端まで延びる補強部３０を有している。この補強部３０は、前述のように、電池収容スペースＳ１に対向する凹状の応力集中部３１を有している。 As described above, the battery pack 100 of the present embodiment includes the housing 10 having the battery storage space S1, and the secondary battery 1 disposed in the battery storage space S1. Further, the battery pack 100 of the present embodiment has a reinforcing portion 30 extending from one end of the battery housing space S1 to the other end. As described above, the reinforcing portion 30 has the concave stress concentration portion 31 facing the battery housing space S1.
　このような構成により、たとえば、筐体１０の長手方向において、電池収容スペースＳ１の一端から他端へ向かう方向の外力が筐体１０に作用したときに、筐体１０の内部の電池収容スペースＳ１の一端から他端まで延びる補強部３０の剛性によって筐体１０を補強することができる。したがって、本実施形態の電池パック１００によれば、たとえば、筐体１０の長手方向において、筐体１０の圧壊荷重を超える荷重を生じさせる外力が筐体１０に作用しても、補強部３０の剛性によって筐体１０の圧壊を抑制することができる。しかし、たとえば、筐体１０の長手方向において、補強部３０に対して座屈荷重を超える荷重が作用すると、補強部３０が折れ曲がるおそれがある。 With such a configuration, for example, when an external force in a direction from one end of battery storage space S1 to the other end acts on housing 10 in the longitudinal direction of housing 10, battery storage space S1 inside housing 10 The housing 10 can be reinforced by the rigidity of the reinforcing portion 30 extending from one end to the other end of the housing 10. Therefore, according to battery pack 100 of the present embodiment, for example, even when an external force causing load exceeding crush load of housing 10 acts on housing 10 in the longitudinal direction of housing 10, The rigidity can suppress crushing of the housing 10. However, for example, if a load exceeding the buckling load acts on the reinforcing portion 30 in the longitudinal direction of the housing 10, the reinforcing portion 30 may be bent.
　図９は、図２と同様に、図１の電池パック１００の筐体１０の一部と補機類２９を取り外した状態を示す斜視図である。なお、図９は、筐体１０の長手方向に筐体１０の圧壊荷重を超える外力が作用し、補強部３０に対して座屈荷重を超える荷重が作用して、補強部３０が折れ曲がった状態の一例を示している。また、図９において、補強部３０を筐体１０に固定するための凹部やボルトの図示は省略している。 FIG. 9 is a perspective view showing a part of the case 10 and the accessories 29 of the battery pack 100 of FIG. 1 removed as in FIG. 2. In FIG. 9, an external force exceeding the crushing load of the housing 10 acts in the longitudinal direction of the housing 10, a load exceeding the buckling load acts on the reinforcing portion 30, and the reinforcing portion 30 is bent. An example is shown. Further, in FIG. 9, illustration of a recess and a bolt for fixing the reinforcing portion 30 to the housing 10 is omitted.
　本実施形態の電池パック１００において、補強部３０は、電池収容スペースＳ１に対向する凹状の応力集中部３１を有している。そのため、補強部３０に座屈荷重を超える荷重が作用すると、電池収容スペースＳ１に対向する凹状の応力集中部３１に応力が集中し、補強部３０が応力集中部３１を起点として座屈することで、図９に示すように、電池収容スペースＳ１と反対の方向へ折れ曲がる。これにより、筐体１０の内部の電池収容スペースＳ１に配置された二次電池１を、補強部３０の変形による破壊から保護することができる。 In the battery pack 100 of the present embodiment, the reinforcing portion 30 has a concave stress concentration portion 31 facing the battery storage space S1. Therefore, when a load exceeding the buckling load acts on the reinforcing portion 30, the stress is concentrated on the concave stress concentration portion 31 facing the battery accommodation space S1, and the reinforcing portion 30 is buckled starting from the stress concentration portion 31. As shown in FIG. 9, it bends in the direction opposite to the battery housing space S1. Thereby, secondary battery 1 arranged in battery housing space S1 inside housing 10 can be protected from breakage due to deformation of reinforcing portion 30.
　また、本実施形態の電池パック１００は、電池収容スペースＳ１に複数の二次電池１を積層させた電池モジュール２０が配置されている。これにより、補強部３０によって筐体１０を補強し、筐体１０の内部の電池収容スペースＳ１に配置された電池モジュール２０を保護することができ、たとえば、車載用途の複数の二次電池１を備えた電池パック１００に対する信頼性および安全性を向上させることができる。 Further, in the battery pack 100 of the present embodiment, a battery module 20 in which a plurality of secondary batteries 1 are stacked in the battery housing space S1 is disposed. Thereby, the housing 10 can be reinforced by the reinforcing portion 30, and the battery module 20 disposed in the battery housing space S1 inside the housing 10 can be protected. For example, a plurality of secondary batteries 1 for in-vehicle use can be used. The reliability and safety of the provided battery pack 100 can be improved.
　また、本実施形態の電池パック１００において、電池モジュール２０は、偏平角形の二次電池１が厚さ方向に積層され、二次電池１の厚さ方向を向く広側面１ｗが筐体１０の底壁１０ｅに対向している。この構成により、電池パック１００の高さ方向の寸法が増加するのを抑制しつつ、多数の二次電池１を電池収容スペースＳ１に配置することが可能になる。 Further, in the battery pack 100 of the present embodiment, in the battery module 20, the flat rectangular secondary battery 1 is stacked in the thickness direction, and the wide side 1 w facing the thickness direction of the secondary battery 1 is the bottom of the housing 10 It faces the wall 10e. With this configuration, it is possible to dispose a large number of secondary batteries 1 in the battery accommodation space S1 while suppressing an increase in the dimension in the height direction of the battery pack 100.
　また、本実施形態の電池パック１００において、二次電池１は、厚さ方向に沿う一側面である端子面１ａに外部端子１Ｐ，１Ｎを有し、補強部３０は、二次電池１の端子面１ａに対向している。これにより、補強部３０によって二次電池１の端子面１ａを保護することができ、電池パック１００の信頼性を向上させることができる。 In the battery pack 100 of the present embodiment, the secondary battery 1 has the external terminals 1P and 1N on the terminal surface 1a which is one side surface along the thickness direction, and the reinforcing portion 30 is a terminal of the secondary battery 1 It faces the surface 1a. Thereby, the terminal surface 1 a of the secondary battery 1 can be protected by the reinforcing portion 30, and the reliability of the battery pack 100 can be improved.
　また、本実施形態の電池パック１００において、筐体１０は、底壁１０ｅに垂直な高さ方向と、この高さ方向に垂直な長手方向と、これら長手方向および高さ方向に垂直な短手方向と、を有する矩形箱形の形状に形成され、短手方向において電池収容スペースＳ１に隣接する補機収容スペースＳ２を有している。そして、補強部３０は、補機収容スペースＳ２に配置され、筐体１０の長手方向に延び、筐体１０の短手方向の中心Ｃからずれた位置に配置されている。 Further, in the battery pack 100 of the present embodiment, the housing 10 has a height direction perpendicular to the bottom wall 10 e, a longitudinal direction perpendicular to the height direction, and a short side perpendicular to the longitudinal direction and the height direction. It has a rectangular box shape having a direction, and has an accessory storage space S2 adjacent to the battery storage space S1 in the short side direction. The reinforcing portion 30 is disposed in the accessory housing space S2, extends in the longitudinal direction of the housing 10, and is disposed at a position offset from the center C in the short direction of the housing 10.
　この構成により、本実施形態の電池パック１００は、たとえば筐体１０の短手方向に筐体１０の圧壊強度を超える外力が作用したときに、補機収容スペースＳ２が緩衝部として作用することで、電池収容スペースＳ１の圧壊を抑制して、二次電池１を保護することができる。また、補強部３０が、筐体１０の短手方向において、電池収容スペースＳ１と反対側の補機収容スペースＳ２に配置され、筐体１０の短手方向の中心Ｃからずれた位置に配置されているため、補強部３０を電池収容スペースＳ１から離れる方向に折れ曲がりやすくして、二次電池１を保護することができる。 With this configuration, in the battery pack 100 of the present embodiment, when an external force exceeding the crush strength of the housing 10 acts in the lateral direction of the housing 10, for example, the accessory housing space S2 acts as a buffer. The crushing of the battery housing space S1 can be suppressed to protect the secondary battery 1. Further, the reinforcing portion 30 is disposed in the accessory housing space S2 opposite to the battery housing space S1 in the short side direction of the housing 10, and is disposed at a position shifted from the center C in the short side direction of the housing 10. Therefore, the reinforcing portion 30 can be easily bent in the direction away from the battery storage space S1, and the secondary battery 1 can be protected.
　また、本実施形態の電池パック１００において、補強部３０は、筐体１０の底壁１０ｅの上面に配置されている。この構成により、筐体１０の底壁１０ｅを補強部３０によって補強することができる。したがって、筐体１０の圧壊強度を向上させ、筐体１０により二次電池１を保護することで、電池パック１００の信頼性を向上させることができる。また、補強部３０を筐体１０の底壁１０ｅによって支持することができ、補強部３０を筐体１０に容易に固定することができる。 Further, in the battery pack 100 of the present embodiment, the reinforcing portion 30 is disposed on the top surface of the bottom wall 10 e of the housing 10. With this configuration, the bottom wall 10 e of the housing 10 can be reinforced by the reinforcing portion 30. Therefore, the reliability of the battery pack 100 can be improved by improving the crushing strength of the housing 10 and protecting the secondary battery 1 by the housing 10. Further, the reinforcing portion 30 can be supported by the bottom wall 10 e of the housing 10, and the reinforcing portion 30 can be easily fixed to the housing 10.
　また、本実施形態の電池パック１００は、筐体１０の長手方向において、補強部３０の両端部が筐体１０の両側壁１０ｃ，１０ｄに接している。これにより、筐体１０の長手方向の両端の側壁１０ｃ，１０ｄを補強部３０によって補強することができる。したがって、筐体１０の圧壊強度を向上させ、筐体１０により二次電池１を保護することで、電池パック１００の信頼性を向上させることができる。また、補強部３０を筐体１０の長手方向の両端の側壁１０ｃ，１０ｄによって支持することができ、補強部３０を筐体１０に容易に固定することができる。 Further, in the battery pack 100 of the present embodiment, both end portions of the reinforcing portion 30 are in contact with both side walls 10 c and 10 d of the housing 10 in the longitudinal direction of the housing 10. Thereby, the side walls 10 c and 10 d at both ends in the longitudinal direction of the housing 10 can be reinforced by the reinforcing portion 30. Therefore, the reliability of the battery pack 100 can be improved by improving the crushing strength of the housing 10 and protecting the secondary battery 1 by the housing 10. Further, the reinforcing portion 30 can be supported by the side walls 10 c and 10 d at both ends in the longitudinal direction of the housing 10, and the reinforcing portion 30 can be easily fixed to the housing 10.
　また、本実施形態の電池パック１００は、補強部３０に対向する電池モジュール２０の部品の少なくとも一部が、凹状の応力集中部３１の内側に配置されている。これにより、応力集中部３１のスペースを有効に活用して部品を配置することが可能になり、電池パック１００を小型化させることができる。特に、応力集中部３１の内側に配置される電池モジュール２０の部品がサーミスタ２８である場合は、サーミスタ２８の配置性が向上し、バスバー２１、または電圧検出線Ｖ１の場合は、補強部３０との短絡を防止できる。 Further, in the battery pack 100 of the present embodiment, at least a part of the components of the battery module 20 facing the reinforcing portion 30 is disposed inside the concave stress concentration portion 31. As a result, the space can be effectively utilized to arrange the components, and the battery pack 100 can be miniaturized. In particular, when the component of the battery module 20 disposed inside the stress concentration portion 31 is the thermistor 28, the disposition of the thermistor 28 is improved, and in the case of the bus bar 21 or the voltage detection line V1, the reinforcing portion 30 and Short circuit can be prevented.
　また、本実施形態の電池パック１００において、応力集中部３１は、補強部３０に設けられた凹部である。このように、応力集中部３１である凹部を電池収容スペースＳ１に対向させて設けることで、補強部３０に座屈荷重を超える荷重が作用したときに、応力集中部３１である凹部の底部に応力が集中し、補強部３０が電池収容スペースＳ１と反対側へ折れ曲がる。これにより、筐体１０の内部の電池収容スペースＳ１に配置された二次電池１を、補強部３０の変形による破壊から保護することができる。 Further, in the battery pack 100 of the present embodiment, the stress concentration portion 31 is a recess provided in the reinforcing portion 30. As described above, by providing the recess that is the stress concentration portion 31 to be opposed to the battery accommodation space S1, when a load exceeding the buckling load acts on the reinforcing portion 30, the bottom portion of the recess that is the stress concentration portion 31 The stress is concentrated, and the reinforcing portion 30 is bent to the side opposite to the battery housing space S1. Thereby, secondary battery 1 arranged in battery housing space S1 inside housing 10 can be protected from breakage due to deformation of reinforcing portion 30.
　また、本実施形態の電池パック１００において、応力集中部３１は、補強部３０に設けられた切り欠きである。このように、応力集中部３１である切り欠きを電池収容スペースＳ１に対向させて設けることで、補強部３０に座屈荷重を超える荷重が作用したときに、応力集中部３１である切り欠きの底部に応力が集中し、補強部３０が電池収容スペースＳ１と反対側へ折れ曲がる。これにより、筐体１０の内部の電池収容スペースＳ１に配置された二次電池１を、補強部３０の変形による破壊から保護することができる。 Further, in the battery pack 100 of the present embodiment, the stress concentration portion 31 is a notch provided in the reinforcing portion 30. Thus, by providing the notch which is the stress concentration portion 31 to be opposed to the battery accommodation space S1, when a load exceeding the buckling load acts on the reinforcing portion 30, the notch which is the stress concentration portion 31 The stress is concentrated at the bottom, and the reinforcing portion 30 is bent to the side opposite to the battery housing space S1. Thereby, secondary battery 1 arranged in battery housing space S1 inside housing 10 can be protected from breakage due to deformation of reinforcing portion 30.
　また、本実施形態の電池パック１００において、応力集中部３１は、補強部３０に設けられた薄肉部である。このように、応力集中部３１である補強部３０を電池収容スペースＳ１に対向させて設けることで、補強部３０に座屈荷重を超える荷重が作用したときに、応力集中部３１である薄肉部に応力が集中し、補強部３０が電池収容スペースＳ１と反対側へ折れ曲がる。これにより、筐体１０の内部の電池収容スペースＳ１に配置された二次電池１を、補強部３０の変形による破壊から保護することができる。 Further, in the battery pack 100 of the present embodiment, the stress concentration portion 31 is a thin portion provided in the reinforcing portion 30. As described above, by providing the reinforcing portion 30, which is the stress concentration portion 31, to face the battery housing space S1, when a load exceeding the buckling load acts on the reinforcement portion 30, the thin portion, which is the stress concentration portion 31. The stress is concentrated on the side wall, and the reinforcing portion 30 bends to the side opposite to the battery housing space S1. Thereby, secondary battery 1 arranged in battery housing space S1 inside housing 10 can be protected from breakage due to deformation of reinforcing portion 30.
　以上説明したように、本実施形態によれば、筐体１０の圧壊を抑制するとともに、筐体１０の内部の単電池を保護することが可能な電池パック１００を提供することができる。なお、本発明に係る電池パック１００は、前述の実施形態に係る電池パック１００の構成に限定されない。以下、実施形態に係る電池パック１００の変形例について説明する。 As described above, according to the present embodiment, it is possible to provide the battery pack 100 capable of protecting the unit cells inside the housing 10 while suppressing the crushing of the housing 10. In addition, the battery pack 100 which concerns on this invention is not limited to the structure of the battery pack 100 which concerns on the above-mentioned embodiment. Hereinafter, modifications of the battery pack 100 according to the embodiment will be described.
　図１０は、図８に示す補強部３０の断面形状およびその変形例を示す断面図である。前述の実施形態の電池パック１００では、補強部３０が内部に中空部を有しない中実の部材である例を説明した。しかし、補強部３０は、内部に中空部３７を有する中空の筒状であってもよく、断面形状がＵ字型のチャネル形状や、断面形状がＬ字型のアングルや、断面形状がＨ字型またはＩ字型の梁状の部材や、板状の部材であってもよい。このような形状の補強部３０を採用することで、電池パック１００の軽量化を図ることができる。 FIG. 10 is a cross-sectional view showing a cross-sectional shape of the reinforcing portion 30 shown in FIG. 8 and a modification thereof. In the battery pack 100 according to the above-described embodiment, an example in which the reinforcing portion 30 is a solid member having no hollow portion inside has been described. However, the reinforcing portion 30 may be a hollow cylindrical shape having the hollow portion 37 inside, and the channel shape having a U-shaped cross section, the angle having an L-shaped cross section, or the H-shaped cross section It may be a shaped or I-shaped beam-shaped member or a plate-shaped member. By adopting the reinforcing portion 30 having such a shape, weight reduction of the battery pack 100 can be achieved.
　図１１は、図８に示す補強部３０の応力集中部３１の形状およびその変形例を示す拡大平面図である。前述の実施形態の電池パック１００では、応力集中部３１が平面視で台形状の凹部または切り欠き部でありかつ薄肉部である例を説明した。しかし、応力集中部３１は、たとえば、補強部３０に設けられた円弧状、Ｕ字状、Ｖ字状の凹部または切り欠きであってもよく、補強部３０に設けられたスリットであってもよい。このような形状の応力集中部３１を採用することで、補強部３０の座屈強度や折れ曲がり方向を適宜調整することができる。 FIG. 11 is an enlarged plan view showing the shape of the stress concentration portion 31 of the reinforcing portion 30 shown in FIG. 8 and a modification thereof. In the battery pack 100 according to the above-described embodiment, an example in which the stress concentration portion 31 is a trapezoidal recess or notch and a thin portion in a plan view has been described. However, the stress concentration portion 31 may be, for example, an arc-shaped, U-shaped, or V-shaped recess or notch provided in the reinforcing portion 30, and even if it is a slit provided in the reinforcing portion 30. Good. By adopting the stress concentration portion 31 having such a shape, the buckling strength and bending direction of the reinforcing portion 30 can be appropriately adjusted.
　図１２は、図８に示す補強部３０の応力集中部３１の変形例を示す平面図である。前述の実施形態の電池パック１００では、応力集中部３１が平面視で台形状の凹部または切り欠き部でありかつ薄肉部である例を説明した。しかし、応力集中部３１は、たとえば、補強部３０を屈曲または湾曲させて設けられた屈曲部または湾曲部であってもよい。この場合、応力集中部３１は、補強部３０の電池収容スペースＳ１に対向して凹形状を形成する部分であり、より詳細には、補強部３０の凹形状の底部である。このような形状の応力集中部３１を採用することで、補強部３０の座屈強度や折れ曲がり方向を適宜調整することができる。 FIG. 12 is a plan view showing a modified example of the stress concentration portion 31 of the reinforcing portion 30 shown in FIG. In the battery pack 100 according to the above-described embodiment, an example in which the stress concentration portion 31 is a trapezoidal recess or notch and a thin portion in a plan view has been described. However, the stress concentration portion 31 may be, for example, a bending portion or a bending portion provided by bending or bending the reinforcing portion 30. In this case, the stress concentration portion 31 is a portion facing the battery housing space S1 of the reinforcing portion 30 to form a concave shape, and more specifically, is a concave bottom portion of the reinforcing portion 30. By adopting the stress concentration portion 31 having such a shape, the buckling strength and bending direction of the reinforcing portion 30 can be appropriately adjusted.
　図１３は、図８に示す補強部３０の変形例を示す斜視面図である。前述の実施形態では、補強部３０が筐体１０から取り外し可能な別部材である例について説明した。しかし、補強部３０は、筐体１０の一体に設けられたリブであってもよい。図１３に示す例において、補強部３０は、筐体１０の底壁１０ｅの一部を、筐体１０の高さ方向に突出させて設けられている。このような構成により、図８に示す補強部３０と同様の効果を奏することができるだけでなく、筐体１０に対する取り付けが不要になり、電池パック１００の部品点数を削減し、コスト低減と生産性の向上が可能になる。 FIG. 13 is a perspective view showing a modification of the reinforcing portion 30 shown in FIG. In the above-mentioned embodiment, an example in which the reinforcing portion 30 is a separate member removable from the housing 10 has been described. However, the reinforcing portion 30 may be a rib integrally provided on the housing 10. In the example shown in FIG. 13, the reinforcing portion 30 is provided by causing a part of the bottom wall 10 e of the housing 10 to protrude in the height direction of the housing 10. With such a configuration, not only can effects similar to those of the reinforcing portion 30 shown in FIG. 8 can be achieved, but attachment to the casing 10 becomes unnecessary, and the number of parts of the battery pack 100 can be reduced to reduce cost and productivity. Can be improved.
　以上、図面を用いて本発明の実施の形態を詳述してきたが、具体的な構成はこの実施形態に限定されるものではなく、本発明の要旨を逸脱しない範囲における設計変更等があっても、それらは本発明に含まれるものである。たとえば、本発明に係る電池パックの実施形態は、電池収容スペースに複数の二次電池や電池モジュールが配置された構成に限定されず、電池収容スペースに一つの二次電池が配置された構成も、本発明に係る電池パックの実施形態に含まれる。 As mentioned above, although the embodiment of the present invention has been described in detail using the drawings, the specific configuration is not limited to this embodiment, and there are design changes and the like within the scope of the present invention. Also, they are included in the present invention. For example, the embodiment of the battery pack according to the present invention is not limited to the configuration in which a plurality of secondary batteries and battery modules are disposed in the battery accommodation space, and a configuration in which one secondary battery is disposed in the battery accommodation space 1 is included in an embodiment of a battery pack according to the present invention.
１　　　二次電池
１ａ　　端子面
１Ｎ　　外部端子
１Ｐ　　外部端子
１ｗ　　広側面
１０　　筐体
２０　　電池モジュール
２０ｅ　底壁
３０　　補強部
３１　　応力集中部
Ｓ１　　電池収容スペース
Ｓ２　　補機収容スペース
１００　電池パック DESCRIPTION OF SYMBOLS 1 Secondary battery 1a Terminal surface 1N External terminal 1P External terminal 1w Wide side 10 case 20 Battery module 20e Bottom wall 30 Reinforcement part 31 Stress concentration part S1 Battery accommodation space S2 Accessory storage space 100 battery pack

Claims (15)

  1. 　電池収容スペースを有する筐体と、該電池収容スペースに配置された二次電池とを備えた電池パックであって、
    　前記電池収容スペースの一端から他端まで延びる補強部を有し、
    　前記補強部は、前記電池収容スペースに対向する凹状の応力集中部を有することを特徴とする電池パック。     A battery pack comprising: a housing having a battery housing space; and a secondary battery disposed in the battery housing space,
    A reinforcement portion extending from one end of the battery housing space to the other end;
    The said reinforcement part has a concave stress concentration part which opposes the said battery storage space, The battery pack characterized by the above-mentioned.
  2. 　前記電池収容スペースに複数の前記二次電池を積層させた電池モジュールが配置されていることを特徴とする請求項１に記載の電池パック。 The battery pack according to claim 1, wherein a battery module in which a plurality of the secondary batteries are stacked is disposed in the battery housing space.
  3. 　前記電池モジュールは、偏平角形の前記二次電池が厚さ方向に積層され、該二次電池の厚さ方向を向く広側面が前記筐体の底壁に対向していることを特徴とする請求項２に記載の電池パック。 The battery module is characterized in that the flat rectangular secondary battery is stacked in a thickness direction, and a wide side surface facing the thickness direction of the secondary battery faces a bottom wall of the housing. The battery pack according to Item 2.
  4. 　前記二次電池は、前記厚さ方向に沿う一側面である端子面に外部端子を有し、
    　前記補強部は、前記二次電池の前記端子面に対向していることを特徴とする請求項３に記載の電池パック。     The secondary battery has an external terminal on a terminal surface which is one side surface along the thickness direction,
    The battery pack according to claim 3, wherein the reinforcing portion faces the terminal surface of the secondary battery.
  5. 　前記筐体は、前記底壁に垂直な高さ方向と、該高さ方向に垂直な長手方向と、該長手方向および前記高さ方向に垂直な短手方向と、を有する矩形箱形の形状に形成され、前記短手方向において前記電池収容スペースに隣接する補機収容スペースを有し、
    　前記補強部は、前記補機収容スペースに配置され、前記筐体の前記長手方向に延び、前記筐体の前記短手方向の中心からずれた位置に配置されていることを特徴とする請求項４に記載の電池パック。     The housing has a rectangular box shape having a height direction perpendicular to the bottom wall, a longitudinal direction perpendicular to the height direction, and a transverse direction perpendicular to the longitudinal direction and the height direction. And has an accessory storage space adjacent to the battery storage space in the lateral direction,
    The reinforcing portion is disposed in the accessory housing space, extends in the longitudinal direction of the housing, and is disposed at a position offset from the center of the housing in the lateral direction. The battery pack according to 4.
  6. 　前記補強部は、前記筐体の前記底壁の上面に配置されていることを特徴とする請求項５に記載の電池パック。 The battery pack according to claim 5, wherein the reinforcing portion is disposed on an upper surface of the bottom wall of the housing.
  7. 　前記補強部は、前記筐体の前記底壁の一部を前記高さ方向に突出させて設けられていることを特徴とする請求項５に記載の電池パック。 The battery pack according to claim 5, wherein the reinforcing portion is provided by projecting a part of the bottom wall of the housing in the height direction.
  8. 　前記筐体の長手方向において、前記補強部の両端部は、前記筐体の両側壁に接していることを特徴とする請求項５に記載の電池パック。 The battery pack according to claim 5, wherein both ends of the reinforcing portion are in contact with both side walls of the housing in the longitudinal direction of the housing.
  9. 　前記補強部に対向する前記電池モジュールの部品の少なくとも一部が、前記凹状の応力集中部の内側に配置されていることを特徴とする請求項５に記載の電池パック。 The battery pack according to claim 5, wherein at least a part of the component of the battery module facing the reinforcing portion is disposed inside the concave stress concentration portion.
  10. 　前記補強部は、中空であることを特徴とする請求項１に記載の電池パック。 The battery pack according to claim 1, wherein the reinforcing portion is hollow.
  11. 　前記応力集中部は、前記補強部に設けられた凹部であることを特徴とする請求項１に記載の電池パック。 The said stress concentration part is a recessed part provided in the said reinforcement part, The battery pack of Claim 1 characterized by the above-mentioned.
  12. 　前記応力集中部は、前記補強部に設けられた切り欠きであることを特徴とする請求項１に記載の電池パック。 The said stress concentration part is a notch provided in the said reinforcement part, The battery pack of Claim 1 characterized by the above-mentioned.
  13. 　前記応力集中部は、前記補強部に設けられたスリットであることを特徴とする請求項１記載の電池パック。 The said stress concentration part is a slit provided in the said reinforcement part, The battery pack of Claim 1 characterized by the above-mentioned.
  14. 　前記応力集中部は、前記補強部に設けられた薄肉部であることを特徴とする請求項１に記載の電池パック。 The battery pack according to claim 1, wherein the stress concentration portion is a thin portion provided in the reinforcing portion.
  15. 　前記応力集中部は、前記補強部を湾曲させた湾曲部であることを特徴とする請求項１に記載の電池パック。 The battery pack according to claim 1, wherein the stress concentration portion is a curved portion obtained by curving the reinforcing portion.
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