WO2013021538A1 - Battery pack - Google Patents

Battery pack Download PDF

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Publication number
WO2013021538A1
WO2013021538A1 PCT/JP2012/004164 JP2012004164W WO2013021538A1 WO 2013021538 A1 WO2013021538 A1 WO 2013021538A1 JP 2012004164 W JP2012004164 W JP 2012004164W WO 2013021538 A1 WO2013021538 A1 WO 2013021538A1
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WO
WIPO (PCT)
Prior art keywords
bus bar
battery
battery pack
long
case
Prior art date
Application number
PCT/JP2012/004164
Other languages
French (fr)
Japanese (ja)
Inventor
裕史 高崎
Original Assignee
パナソニック株式会社
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 パナソニック株式会社 filed Critical パナソニック株式会社
Publication of WO2013021538A1 publication Critical patent/WO2013021538A1/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/296—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by terminals of battery packs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/503—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the shape of the interconnectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/507—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing comprising an arrangement of two or more busbars within a container structure, e.g. busbar modules
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/521—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the material
    • H01M50/522—Inorganic material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/521—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the material
    • H01M50/524—Organic material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • This invention relates to the battery pack which laminated
  • a battery pack in which a plurality of batteries are accommodated in a case so that a predetermined voltage and capacity can be output is widely used as a power source for various devices and vehicles.
  • a technology is adopted that can support a wide variety of applications by connecting general-purpose batteries in parallel and in series, modularizing assembled batteries that output a predetermined voltage and capacity, and combining these battery modules in various ways. I'm starting.
  • This modularization technology improves the workability when assembling the battery pack and improves the performance of the battery stored in the battery module by improving the performance of the battery accommodated in the battery module. It has various merits, such as an improved degree of freedom when mounted in a designated space.
  • a battery module In general, in a battery module, a plurality of batteries are accommodated in a battery case, and a wiring in which the electrodes of each battery are electrically connected in series or in parallel is connected to an electrode terminal attached to one side surface of the battery case.
  • a wiring in which the electrodes of each battery are electrically connected in series or in parallel is connected to an electrode terminal attached to one side surface of the battery case.
  • external terminals arranged on one side of each battery module are electrically connected in series or in parallel to have a predetermined voltage and capacity. Battery pack can be obtained.
  • the battery pack can be easily assembled by arranging a required number of battery modules. At that time, by arranging the battery modules so that the electrode terminals (the positive electrode terminal and the negative electrode terminal) face the same direction (for example, a plurality of battery modules are stacked), the electrical connection between the battery modules can be facilitated. Become.
  • connection member for example, bus bar
  • both ends vibrate as fixed ends.
  • the connecting member becomes long, when an external force is applied to the battery pack, the amplitude of the connecting member increases, and the connecting member is greatly bent. For this reason, there is a possibility that the strength of the connecting member is reduced by applying a large stress to the connecting member. And when generation
  • connection member when an electric pack is mounted on a vehicle or the like, external forces such as vibration are frequently applied to the battery pack, so even with a relatively short connection member, the strength of the connection member is reduced due to the bending of the connection member, and therefore fatigue failure occurs. There is a drowning that happens.
  • Such a problem leads to a decrease in the reliability of the battery pack.
  • a phenomenon such as fatigue failure depends on the length of the connecting member, and therefore the reliability of the battery pack varies as the design freedom (specifically, length) of the connecting member increases. Production of stable quality battery packs becomes difficult.
  • the present invention has been made in view of such a problem, and a main object of the present invention is to provide a highly reliable battery pack that prevents a reduction in strength of a bus bar connecting battery modules in a battery pack in which battery modules are stacked. It is to provide.
  • the present invention provides a battery pack in which battery modules in which a plurality of batteries are housed in a case are stacked, and at least one bus bar among a plurality of bus bars connecting the battery modules,
  • the structure supported by the extension part extended from some other bus bars in the vicinity of the said one bus bar is employ
  • the one bus bar is supported by an extending portion provided in a part of another bus bar without using an extra pressing member, thereby preventing the bus bar from being bent with a simple configuration. be able to. Thereby, since strength reduction due to vibration of the bus bar can be prevented, a highly reliable battery pack can be realized.
  • the battery pack according to the present invention is a battery pack in which a battery module in which a plurality of batteries are housed in a case is stacked, and the battery module has a positive terminal and a negative terminal disposed on one side of the case.
  • the plurality of battery modules are connected to the positive terminal and the negative terminal of each battery module by a plurality of bus bars arranged along one side surface of the case, respectively. It is composed of a metal connection body that connects between negative electrode terminals and an insulating member that covers the metal connection body, and at least one bus bar among the plurality of bus bars is another bus bar in the vicinity of the one bus bar. It is supported by the extension part extended from a part of.
  • the one bus bar is a long bus bar that extends in the stacking direction of the battery modules and has a length that is twice or more in the stacking direction with respect to the height of the battery modules.
  • the long bus bar is supported by an extending portion extending from a part of another bus bar in a direction perpendicular to the stacking direction. Moreover, it is preferable that the extension part is in contact with a surface parallel to one side surface of the case in the long bus bar.
  • the present invention in a battery pack in which a plurality of battery modules are stacked, it is possible to prevent the bus bar connecting the battery modules from being bent with a simple configuration, thereby realizing a highly reliable battery pack. it can.
  • FIG. 1 It is the perspective view which showed the structure of the battery module 100 in one Embodiment of this invention. It is the disassembled perspective view which showed the structure of the battery pack in which the some battery module was laminated
  • (A) is a top view of a battery pack
  • (b) is a front view.
  • (A) And (b) is the top view which showed the structure of the long bus bar and the bus bar.
  • (A) is a perspective view of a long bus bar and a bus bar
  • (b) is a partial view showing a state in which the long bus bar and the bus bar are arranged along the first side surface of the case. It is a side view of the battery pack explaining the effect of the present invention.
  • (A), (b) is the figure which showed the other form of the extension part of the bus bar which supports a long bus bar.
  • (A), (b) is the figure which showed the other form of the extension part of the bus bar which supports a long bus bar. It is the front view which showed the structure of the battery pack which has arrange
  • (A) is the top view which showed the other structure of the battery pack which has arrange
  • (b) is the front view.
  • FIG. 1 is a perspective view schematically showing a configuration of a battery module 100 according to an embodiment of the present invention.
  • a plurality of batteries (not shown) are accommodated in the case 10.
  • the kind of battery used for the battery module 100 is not particularly limited.
  • a lithium ion battery, a nickel metal hydride battery, or the like can be used.
  • the battery which can be used alone as a power supply of portable electronic devices, such as a notebook personal computer may be used.
  • a high-performance general-purpose battery can be used as the battery of the battery module 100, the battery module 100 can be easily improved in performance and cost.
  • a first side surface (one side surface) 11 of the case 10 is provided with a positive electrode terminal 20 and a negative electrode terminal 21 connected to each electrode of a plurality of batteries.
  • the electrical connection between the batteries may be in series or in parallel.
  • the adjacent battery modules 100 can be connected by the connection part 40.
  • FIG. 2 schematically shows the configuration of a battery pack 200 in which a plurality of battery modules 100 (three in FIG. 2) are stacked in a direction perpendicular to the second side surface 12 of the case 10 (stacking direction A). It is a disassembled perspective view.
  • 3A is a top view of the battery pack 200
  • FIG. 3B is a front view.
  • the first piece 51 of the L-shaped electrode piece 50 is arranged on the first side surface 11 of the case 10.
  • the second piece 52 of the electrode piece 50 is attached to the second side surface 12 of the case 10 and attached to the provided positive electrode terminal 20 a.
  • the second piece 52 of the electrode piece 50 constitutes an external terminal of the positive electrode of the battery pack 200.
  • the first piece 61 of the L-shaped electrode piece 60 is attached to the first side surface 11 of the case 10, and the second piece 62 of the electrode piece 60 is attached to the second side surface 12 of the case 10. It has been. Further, the first piece 61 of the electrode piece 60 is connected to the negative terminal 21 c of the lowermost battery module 100 c by a long bus bar 70 ⁇ / b> A disposed along the first side surface 11 of the case 10. As a result, the second piece 62 of the electrode piece 60 constitutes the external terminal of the negative electrode of the battery pack 200.
  • the “long bus bar” refers to a plurality of bus bars that extend in the stacking direction A of the battery modules 100 and that are at least twice as long in the stacking direction as the height of the battery modules 100.
  • the long bus bar 70 ⁇ / b> A illustrated in FIG. 2 corresponds to a bus bar having a length approximately twice as long in the stacking direction as the height of the battery module 100.
  • the upper limit of the length of the long bus bar is not particularly limited.
  • the plurality of stacked battery modules 100a, 100b, 100c are connected to the positive terminal 20b of each battery module 100a, 100b, 100c by a plurality of bus bars 70B, 70C disposed along the first side surface 11 of the case 10. 20c and negative terminals 21a and 21b are connected to each other.
  • the positive terminal 20b of the middle battery module 100b is connected to the negative terminal 21a of the uppermost battery module 100a by a bus bar 70B.
  • the positive terminal 20c of the lowermost battery module 100c is connected to the negative terminal 21b of the middle battery module 100b by a bus bar 70C.
  • battery module 100a, 100b, 100c is electrically connected in series.
  • the electrode pieces 50, 60 are attached to the case 10 and the bus bars 70A, 70B, 70C are attached to the positive terminals 20b, 20c and the negative terminals 21a, 21b, for example, by bolt holes (or It can be performed by aligning the screw holes) and tightening them with bolts (or screws).
  • FIG. 4 (a) and 4 (b) are plan views showing configurations of the long bus bar 70A and the bus bar 70B.
  • 5A is a perspective view of the long bus bar 70A and the bus bar 70B
  • FIG. 5B is a state in which the long bus bar 70A and the bus bar 70B are disposed along the first side surface 11 of the case 10.
  • the long bus bar 70A and the bus bar 70B include a metal connector 71A that connects between the positive terminals 20b and 20c and the negative terminals 21a and 21b of the battery modules 100a, 100b, and 100c. , 71B and insulating members 73A, 73B covering portions other than the connecting portions 72A, 72B of at least the positive terminals 20b, 20c and the negative terminals 21a, 21b of the metal connectors 71A, 71B.
  • the bus bar 70B has an extending portion 74B extending in the direction perpendicular to the stacking direction A and extending toward the long bus bar 70A.
  • the long bus bar 70A has a protruding portion 74A that is perpendicular to the stacking direction A and protrudes toward the bus bar 70B.
  • the extended portion of the bus bar 70B. 74B is in contact with a surface parallel to the first side surface 11 of the case 10 in the protruding portion 74A of the long bus bar 70A. That is, the long bus bar 70A is supported by the extending portion 74B extending from a part of the other bus bar 70B in the vicinity of the long bus bar 70A. Similarly, the long bus bar 70A is supported by an extending portion 74C extending from a part of another bus bar 70C in the vicinity of the long bus bar 70A.
  • the long bus bar 70 ⁇ / b> A extending in the stacking direction A of the battery module 100 has the connection parts 72 ⁇ / b> A and 72 ⁇ / b> A at both ends thereof fixed only to the first piece 61 and the negative electrode terminal 21 c of the electrode piece 60.
  • the other portions do not have a portion in contact with the case 10. Accordingly, in this state, the long bus bar 70A vibrates with the connection portions 72A and 72A as fixed ends, as shown by the broken line in FIG.
  • the vibration of the long bus bar 70A is supported. Can be prevented.
  • the long bus bar 70A is supported by the extended portions 74B and 74C provided in a part of the other bus bars 70B and 70C without using an extra pressing member or the like, so that the long bus bar 70A has a simple configuration. Can be prevented. Thereby, since the strength reduction by the vibration of the long bus bar 70A can be prevented, the battery pack 200 with high reliability can be realized.
  • the bus bar in the vicinity supporting the long bus bar 70A is not necessarily limited to the bus bar closest to the long bus bar 70A, but may be a bus bar that is relatively far away.
  • the said bus bar has a preferable thing which can extend the extension part to the long bus bar 70A as linearly as possible.
  • the long bus bar 70 ⁇ / b> A only needs to have a length extending in the stacking direction A of the battery module 100 that is substantially twice or more the height of the battery module 100. Including those having a bent portion.
  • the extending portions 74B and 74C provided in a part of the bus bars 70B and 70C may be configured only by an insulating member.
  • the metal connector 71B of the bus bars 70B and 70C is integrally formed by insert molding in resin
  • the extending portions 74B and 74C can be integrally formed by resin.
  • the protruding portion 74A provided on a part of the long bus bar 70A may be configured only by an insulating member.
  • the protrusion 74A can be integrally formed by resin.
  • the form in which the long bus bar 70A is supported by the extending portion 74B of the other bus bar 70B is not limited to the form shown in FIG. 4 and can take various forms.
  • 7 (a), 7 (b), 8 (a), and 8 (b) are diagrams illustrating other forms of the extending portion 74B of the bus bar 70B that supports the long bus bar 70A.
  • the long bus bar 70A is not provided with the protrusion 74A as shown in FIG. 5A.
  • the extending part 74B extending in a direction perpendicular to the stacking direction A from a part of the bus bar 70B is parallel to the first side surface 11 of the case 10 in the long bus bar 70A as shown in FIG. It is bent so as to contact the surface.
  • the long bus bar 70A has protrusions 75A and 75A having surfaces perpendicular to the first side surface 11 of the case 10.
  • the extended portion 74B extending from a part of the bus bar 70B comes into contact with a surface perpendicular to the first side surface 11 of the case 10 in the protruding portion 75A of the long bus bar 70A, as shown in FIG. So that it is bent.
  • the length of the long bus bar 70 that is largely bent in the direction perpendicular to the first side surface 11 by the frictional force between the surfaces where the protruding portion 75A of the long bus bar 70A and the extending portion 74B of the bus bar 70B abut each other. Vibration can be prevented.
  • the battery pack in the present invention includes a battery pack in which stacked battery modules are arranged in parallel in a direction perpendicular to the stacking direction A.
  • 9 and 10 are front views showing examples of battery packs arranged in this way.
  • the battery pack shown in FIG. 9 is one in which battery packs 200A and 200B in which battery modules 100a, 100b, and 100c are stacked are arranged in parallel.
  • the battery modules 100a, 100b, and 100c are electrically connected in series by the bus bars 70B and 70C, respectively, similarly to the battery pack 200 shown in FIG.
  • the battery packs 200A and 200B connect the positive terminal 20a of the uppermost battery module 100a of the battery pack 200A and the negative terminal 21c of the lowermost battery module 100c of the battery pack 200B with a long bus bar 70A. Are connected in series.
  • the long bus bar 70A is supported by an extending portion 74B extending from a part of the bus bar 70B disposed on the battery pack 200A side, and a part of the bus bar 70C disposed on the battery pack 200B side. It is supported by an extending portion 74C extending from the outside.
  • the battery pack shown in FIGS. 10A and 10B is configured by arranging battery packs 200A and 200B in which battery modules 100a, 100b, and 100c are stacked in parallel, similarly to the battery pack shown in FIG. .
  • the first piece 51 a of the electrode piece 50 is attached to the first side surface 11 of the case 10, and the second piece 52 a of the electrode piece 50 is attached to the case 10. Attached to the second side surface 12. Furthermore, the first piece 51a of the electrode piece 50 is connected to the positive electrode terminal 20c of the battery module 100c at the lowest stage by a long bus bar 70A disposed along the first side surface 11 of the case 10. Thereby, the 2nd piece 52a of the electrode piece 50 comprises the positive electrode external terminal of battery pack 200A.
  • the first piece 61b of the electrode piece 60 is attached to the first side surface 11 of the case 10, and the second piece 62b of the electrode piece 60 is Attached to the second side surface 12 of the case 10. Further, the first piece 61 b of the electrode piece 60 is connected to the negative terminal 21 c of the lowermost battery module 100 c by a long bus bar 70 ⁇ / b> A disposed along the first side surface 11 of the case 10. Thereby, the 2nd piece 62b of the electrode piece 60 comprises the negative electrode external terminal of battery pack 200B.
  • Battery packs 200A and 200B are connected in series by positive electrode external terminal 52a of battery pack 200A and negative electrode external terminal 62b of battery pack 200B by bus bar 80 disposed along the second side surface of case 10. It is connected.
  • the long bus bar 70A disposed on the battery pack 200A side is supported by an extending portion 74B extending from a part of the long bus bar 70A disposed on the battery pack 200B side, and the battery pack 200B side
  • the long bus bar 70A disposed on the battery pack 200A is supported by an extending portion 74B extending from a part of the long bus bar 70A disposed on the battery pack 200A side. That is, the long bus bars 70A and 70A arranged in the battery packs 200A and 200B are supported by the extended portions 74B and 74B extending from the long bus bars 70A and 70A. That is, the other bus bar that supports the long bus bar 70A includes a long bus bar.
  • the long bus bar 70A is supported by the extended portions 74B and 74C extending from the other bus bars 70B and 70C at two intermediate positions, but is supported.
  • the number and location of these are not limited to this, and can be appropriately determined according to the required specifications.
  • a battery pack in which a plurality of battery modules are connected in series has been described.
  • a battery pack in which each battery module is connected in series and / or in parallel is not limited thereto.
  • the present invention is not limited to this, and in a battery pack in which stacked battery modules are arranged in parallel, among bus bars extending in a direction perpendicular to the stacking direction, a relatively long bus bar (for example, 2 with respect to the width of the battery module). You may make it support the long bus bar which has a length more than twice by the extension part extended from some other bus bars in the vicinity. In this case, it is preferable that the said long bus bar is supported by the said extension part extended in the lamination direction from some other bus bars in the vicinity.
  • the supported bus bar is not necessarily a long bus bar.
  • the strength of the bus bar can be obtained by supporting at least one bus bar among a plurality of bus bars by an extension portion extending from a part of another bus bar in the vicinity of the bus bar. A decrease can be prevented.
  • the present invention is useful as a power source for driving automobiles, electric motorcycles, electric playground equipment and the like.
  • Second side 20a, 20b, 20c Positive terminal 21, 21a, 21b, 21c Negative terminal 40 connections 50, 60 electrode pieces 51, 61 first piece 52, 62 second piece 52a Positive external terminal 62b Negative external terminal 70A long bus bar 70B, 70C Busbar 71A, 71B Metal connector 72A, 72B Connection site 73A, 73B Insulating member 74A, 74B Projection 74B, 74 extension 74B, 74C extension 75A protrusion 80 Busbar 100, 100a, 100b, 100c battery module 200, 200A, 200B battery pack

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

Abstract

Each battery module (100) has electrode terminals (20, 21) disposed upon one face (11) of a case (10), being connected by a plurality of bus bars (70A-70C) which are disposed along the one face (11) of the case (10). The bus bars (70A-70C) are configured with metal connection bodies (71A-71C) which connect the terminals (20, 21) of each battery module (100), and insulation members (73A-73C) which cover the metal connection bodies (71A-71C). The long bus bar (70A) which has twice the length or more of the height of the battery module (100) is supported by extending parts (74B, 74C) which extend from the other bus bars (70B, 70C) which are close to the long bus bar (70A).

Description

電池パックBattery pack
　本発明は、複数の電池を備えた電池モジュールを積層した電池パックに関する。 This invention relates to the battery pack which laminated | stacked the battery module provided with the some battery.
　複数の電池をケースに収容して、所定の電圧及び容量を出力できるようにした電池パックは、種々の機器、車両等の電源として広く使用されている。中でも、汎用的な電池を並列・直列接続して、所定の電圧及び容量を出力する組電池をモジュール化し、この電池モジュールを種々組み合わせることによって、多種多様な用途に対応可能とする技術が採用され始めている。このモジュール化技術は、電池モジュールに収容する電池を高性能化することによって、電池モジュール自身の小型・軽量化が図られるため、電池パックを組み立てる際の作業性が向上するとともに、車両等の限られた空間へ搭載する際の自由度が向上するなど、様々なメリットを有する。 A battery pack in which a plurality of batteries are accommodated in a case so that a predetermined voltage and capacity can be output is widely used as a power source for various devices and vehicles. In particular, a technology is adopted that can support a wide variety of applications by connecting general-purpose batteries in parallel and in series, modularizing assembled batteries that output a predetermined voltage and capacity, and combining these battery modules in various ways. I'm starting. This modularization technology improves the workability when assembling the battery pack and improves the performance of the battery stored in the battery module by improving the performance of the battery accommodated in the battery module. It has various merits, such as an improved degree of freedom when mounted in a designated space.
　一般的に、電池モジュールは、複数の電池が電池ケース内に収容され、各電池の電極を電気的に直列又は並列接続した配線が、電池ケースの一側面に取り付けられた電極端子に接続された構成になっている（例えば、特許文献１を参照）。そして、複数の電池モジュールを配列して電池パックを構成するとき、各電池モジュールの一側面に配設された外部端子同士を電気的に直列又は並列に接続して、所定の電圧及び容量を備えた電池パックを得ることができる。 In general, in a battery module, a plurality of batteries are accommodated in a battery case, and a wiring in which the electrodes of each battery are electrically connected in series or in parallel is connected to an electrode terminal attached to one side surface of the battery case. (For example, refer patent document 1). When a plurality of battery modules are arranged to form a battery pack, external terminals arranged on one side of each battery module are electrically connected in series or in parallel to have a predetermined voltage and capacity. Battery pack can be obtained.
特開２００７－０２６８９４号公報JP 2007-026894 A
　電池モジュールは、その外形寸法や電極端子が、所定の大きさや位置に定まっているために、必要な個数の電池モジュールを配列することによって、容易に電池パックを組み立てることができる。そのとき、電池モジュールを、その電極端子（正極端子及び負極端子）が同じ方向を向くように配列（例えば、複数の電池モジュールを積層）することによって、各電池モジュール間の電気的接続も容易となる。 Since the external dimensions and electrode terminals of the battery module are determined in a predetermined size and position, the battery pack can be easily assembled by arranging a required number of battery modules. At that time, by arranging the battery modules so that the electrode terminals (the positive electrode terminal and the negative electrode terminal) face the same direction (for example, a plurality of battery modules are stacked), the electrical connection between the battery modules can be facilitated. Become.
　しかしながら、各電池モジュールを接続する接続部材（例えば、バスバー）は、その両端が、正極端子又は負極端子に固定されているだけなので、電池パックに衝撃等の外力が加わったとき、接続部材は、その両端が固定端となって振動する。特に、電池モジュールを積層した電池パックにおいて、接続部材が長くなると、電池パックに外力が加わったとき、接続部材の振幅が大きくなって、接続部材に大きな撓みが発生する。そのため、接続部材に大きな応力が加わることによって、接続部材の強度が低下する畏れがある。そして、振動による撓みの発生が繰り返されると、接続部材が疲労破壊に至る畏れがある。特に、電気パックを車両等に搭載した場合、振動等の外力が電池パックに頻繁に加わるため、比較的短い接続部材でも、接続部材の撓みに起因する接続部材の強度低下、ひいては、疲労破壊が起きる畏れがある。 However, since the connection member (for example, bus bar) connecting each battery module is only fixed to the positive electrode terminal or the negative electrode terminal at both ends, when an external force such as an impact is applied to the battery pack, Both ends vibrate as fixed ends. In particular, in a battery pack in which battery modules are stacked, when the connecting member becomes long, when an external force is applied to the battery pack, the amplitude of the connecting member increases, and the connecting member is greatly bent. For this reason, there is a possibility that the strength of the connecting member is reduced by applying a large stress to the connecting member. And when generation | occurrence | production of the bending by vibration is repeated, there exists a possibility that a connection member may lead to fatigue failure. In particular, when an electric pack is mounted on a vehicle or the like, external forces such as vibration are frequently applied to the battery pack, so even with a relatively short connection member, the strength of the connection member is reduced due to the bending of the connection member, and therefore fatigue failure occurs. There is a drowning that happens.
　このような問題は、電池パックの信頼性の低下を招くことになる。また、このような疲労破壊等の現象は、接続部材の長さに依存するため、接続部材の仕様（特に、長さ）の設計自由度が増すほど、電池パックの信頼性にバラツキが生じ、安定した品質の電池パックの生産が難しくなる。 Such a problem leads to a decrease in the reliability of the battery pack. In addition, such a phenomenon such as fatigue failure depends on the length of the connecting member, and therefore the reliability of the battery pack varies as the design freedom (specifically, length) of the connecting member increases. Production of stable quality battery packs becomes difficult.
　本発明は、かかる課題に鑑みなされたもので、その主な目的は、電池モジュールが積層された電池パックにおいて、電池モジュール間を接続するバスバーの強度低下を防止し、信頼性の高い電池パックを提供することにある。 The present invention has been made in view of such a problem, and a main object of the present invention is to provide a highly reliable battery pack that prevents a reduction in strength of a bus bar connecting battery modules in a battery pack in which battery modules are stacked. It is to provide.
　本発明は、上記課題を解決するために、複数の電池がケース内に収容された電池モジュールが積層された電池パックにおいて、電池モジュール間を接続する複数のバスバーのうち、少なくとも一のバスバーを、当該一のバスバーの近傍にある他のバスバーの一部から延出された延出部よって支持した構成を採用する。 In order to solve the above problems, the present invention provides a battery pack in which battery modules in which a plurality of batteries are housed in a case are stacked, and at least one bus bar among a plurality of bus bars connecting the battery modules, The structure supported by the extension part extended from some other bus bars in the vicinity of the said one bus bar is employ | adopted.
　このような構成により、当該一のバスバーを、余計な押さえ部材を用いることなく、他のバスバーの一部に設けた延出部によって支持することにより、簡単な構成で、バスバーの撓みを防止することができる。これにより、バスバーの振動による強度低下を防止できるため、信頼性の高い電池パックが実現できる。 With such a configuration, the one bus bar is supported by an extending portion provided in a part of another bus bar without using an extra pressing member, thereby preventing the bus bar from being bent with a simple configuration. be able to. Thereby, since strength reduction due to vibration of the bus bar can be prevented, a highly reliable battery pack can be realized.
　本発明に係る電池パックは、複数の電池がケース内に収容された電池モジュールが積層された電池パックであって、電池モジュールは、ケースの一側面に正極端子及び負極端子が配設されており、複数の電池モジュールは、ケースの一側面に沿って配設された複数のバスバーによって、各電池モジュールの正極端子及び負極端子が、それぞれ接続されており、バスバーは、各電池モジュールの正極端子及び負極端子間を接続する金属接続体と、該金属接続体を被覆する絶縁部材とで構成されており、複数のバスバーのうち、少なくとも一のバスバーは、該一のバスバーの近傍にある他のバスバーの一部から延出された延出部よって支持されていることを特徴とする。 The battery pack according to the present invention is a battery pack in which a battery module in which a plurality of batteries are housed in a case is stacked, and the battery module has a positive terminal and a negative terminal disposed on one side of the case. The plurality of battery modules are connected to the positive terminal and the negative terminal of each battery module by a plurality of bus bars arranged along one side surface of the case, respectively. It is composed of a metal connection body that connects between negative electrode terminals and an insulating member that covers the metal connection body, and at least one bus bar among the plurality of bus bars is another bus bar in the vicinity of the one bus bar. It is supported by the extension part extended from a part of.
　ある好適な実施形態において、上記一のバスバーは、電池モジュールの積層方向に延び、かつ、電池モジュールの高さに対して、積層方向に２倍以上の長さを有する長バスバーである。 In a preferred embodiment, the one bus bar is a long bus bar that extends in the stacking direction of the battery modules and has a length that is twice or more in the stacking direction with respect to the height of the battery modules.
　ある好適な実施形態において、上記長バスバーは、他のバスバーの一部から、積層方向に垂直な方向に延びた延出部によって支持されている。また、延出部は、長バスバーにおけるケースの一側面と平行な面に当接していることが好ましい。 In a preferred embodiment, the long bus bar is supported by an extending portion extending from a part of another bus bar in a direction perpendicular to the stacking direction. Moreover, it is preferable that the extension part is in contact with a surface parallel to one side surface of the case in the long bus bar.
　本発明によれば、複数の電池モジュールが積層された電池パックにおいて、電池モジュール間を接続するバスバーの撓みを、簡単な構成で防止することができ、これにより、信頼性の高い電池パックが実現できる。 According to the present invention, in a battery pack in which a plurality of battery modules are stacked, it is possible to prevent the bus bar connecting the battery modules from being bent with a simple configuration, thereby realizing a highly reliable battery pack. it can.
本発明の一実施形態における電池モジュール１００の構成を示した斜視図である。It is the perspective view which showed the structure of the battery module 100 in one Embodiment of this invention. 複数の電池モジュールが積層方向に積層された電池パックの構成を示した分解斜視図である。It is the disassembled perspective view which showed the structure of the battery pack in which the some battery module was laminated | stacked on the lamination direction. （ａ）は、電池パックの上面図、（ｂ）は、正面図である。(A) is a top view of a battery pack, (b) is a front view. （ａ）及び（ｂ）は、長バスバー及びバスバーの構成を示した平面図である。(A) And (b) is the top view which showed the structure of the long bus bar and the bus bar. （ａ）は、長バスバー及びバスバーの斜視図で、（ｂ）は、長バスバー及びバスバーがケースの第１の側面に沿って配設された状態を示した部分図である。(A) is a perspective view of a long bus bar and a bus bar, (b) is a partial view showing a state in which the long bus bar and the bus bar are arranged along the first side surface of the case. 本発明の効果を説明した電池パックの側面図である。It is a side view of the battery pack explaining the effect of the present invention. （ａ）、（ｂ）は、長バスバーを支持するバスバーの延出部の他の形態を示した図である。(A), (b) is the figure which showed the other form of the extension part of the bus bar which supports a long bus bar. （ａ）、（ｂ）は、長バスバーを支持するバスバーの延出部の他の形態を示した図である。(A), (b) is the figure which showed the other form of the extension part of the bus bar which supports a long bus bar. 積層された電池モジュールを並列に配置した電池パックの構成を示した正面図である。It is the front view which showed the structure of the battery pack which has arrange | positioned the laminated | stacked battery module in parallel. （ａ）は、積層された電池モジュールを並列に配置した電池パックの他の構成を示した上面図、（ｂ）は、その正面図である。(A) is the top view which showed the other structure of the battery pack which has arrange | positioned the laminated | stacked battery module in parallel, (b) is the front view.
　以下、本発明の実施形態を図面に基づいて詳細に説明する。なお、本発明は、以下の実施形態に限定されるものではない。また、本発明の効果を奏する範囲を逸脱しない範囲で、適宜変更は可能である。さらに、他の実施形態との組み合わせも可能である。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited to the following embodiment. Moreover, it can change suitably in the range which does not deviate from the range which has the effect of this invention. Furthermore, combinations with other embodiments are possible.
　図１は、本発明の一実施形態における電池モジュール１００の構成を模式的に示した斜視図である。電池モジュール１００は、複数の電池（不図示）がケース１０内に収容されている。なお、電池モジュール１００に使用する電池の種類は、特に制限されないが、例えば、リチウムイオン電池やニッケル水素電池等を用いることができる。また、ノート型パソコン等の携帯用電子機器の電源として単体でも使用できる電池であってもよい。この場合、高性能の汎用電池を、電池モジュール１００の電池として使用することができるため、電池モジュール１００の高性能化、低コスト化をより容易に図ることができる。 FIG. 1 is a perspective view schematically showing a configuration of a battery module 100 according to an embodiment of the present invention. In the battery module 100, a plurality of batteries (not shown) are accommodated in the case 10. In addition, the kind of battery used for the battery module 100 is not particularly limited. For example, a lithium ion battery, a nickel metal hydride battery, or the like can be used. Moreover, the battery which can be used alone as a power supply of portable electronic devices, such as a notebook personal computer, may be used. In this case, since a high-performance general-purpose battery can be used as the battery of the battery module 100, the battery module 100 can be easily improved in performance and cost.
　図１に示すように、ケース１０の第１の側面（一側面）１１には、複数の電池の各電極に接続された正極端子２０及び負極端子２１が配設されている。なお、電池間の電気的な接続は、直列でも並列でもよい。また、ケース１０に、連結部４０を設けておくことによって、電池モジュール１００を積層したとき、連結部４０で、隣り合う電池モジュール１００同士を連結することができる。 As shown in FIG. 1, a first side surface (one side surface) 11 of the case 10 is provided with a positive electrode terminal 20 and a negative electrode terminal 21 connected to each electrode of a plurality of batteries. The electrical connection between the batteries may be in series or in parallel. Moreover, when the battery module 100 is laminated | stacked by providing the connection part 40 in the case 10, the adjacent battery modules 100 can be connected by the connection part 40. FIG.
　図２は、電池モジュール１００が複数個（図２では３個）、ケース１０の第２の側面１２に垂直な方向（積層方向Ａ）に積層された電池パック２００の構成を模式的に示した分解斜視図である。また、図３（ａ）は、電池パック２００の上面図、図３（ｂ）は、正面図である。 FIG. 2 schematically shows the configuration of a battery pack 200 in which a plurality of battery modules 100 (three in FIG. 2) are stacked in a direction perpendicular to the second side surface 12 of the case 10 (stacking direction A). It is a disassembled perspective view. 3A is a top view of the battery pack 200, and FIG. 3B is a front view.
　図２及び図３（ａ）、（ｂ）に示すように、最上段の電池モジュール１００ａにおいて、Ｌ字型の電極片５０の第１の片５１が、ケース１０の第１の側面１１に配設された正極端子２０ａに取り付けられ、電極片５０の第２の片５２が、ケース１０の第２の側面１２に取り付けられている。これにより、電極片５０の第２の片５２は、電池パック２００の正極の外部端子を構成している。 As shown in FIGS. 2, 3 (a), and 3 (b), in the uppermost battery module 100 a, the first piece 51 of the L-shaped electrode piece 50 is arranged on the first side surface 11 of the case 10. The second piece 52 of the electrode piece 50 is attached to the second side surface 12 of the case 10 and attached to the provided positive electrode terminal 20 a. As a result, the second piece 52 of the electrode piece 50 constitutes an external terminal of the positive electrode of the battery pack 200.
　また、Ｌ字型の電極片６０の第１の片６１が、ケース１０の第１の側面１１に取り付けられ、電極片６０の第２の片６２が、ケース１０の第２の側面１２に取り付けられている。さらに、電極片６０の第１の片６１は、ケース１０の第１の側面１１に沿って配設された長バスバー７０Ａによって、最下段の電池モジュール１００ｃの負極端子２１ｃに接続されている。これにより、電極片６０の第２の片６２は、電池パック２００の負極の外部端子を構成している。 In addition, the first piece 61 of the L-shaped electrode piece 60 is attached to the first side surface 11 of the case 10, and the second piece 62 of the electrode piece 60 is attached to the second side surface 12 of the case 10. It has been. Further, the first piece 61 of the electrode piece 60 is connected to the negative terminal 21 c of the lowermost battery module 100 c by a long bus bar 70 </ b> A disposed along the first side surface 11 of the case 10. As a result, the second piece 62 of the electrode piece 60 constitutes the external terminal of the negative electrode of the battery pack 200.
　ここで、本発明において、「長バスバー」とは、複数のバスバーのうち、電池モジュール１００の積層方向Ａに延び、かつ、電池モジュール１００の高さに対して、積層方向に２倍以上の長さを有するバスバーをいう。例えば、図２に示した長バスバー７０Ａは、電池モジュール１００の高さに対して、積層方向に約２倍の長さを有するバスバーに相当する。なお、長バスバーの長さの上限は、特に制限されない。 Here, in the present invention, the “long bus bar” refers to a plurality of bus bars that extend in the stacking direction A of the battery modules 100 and that are at least twice as long in the stacking direction as the height of the battery modules 100. This means a bus bar with a thickness. For example, the long bus bar 70 </ b> A illustrated in FIG. 2 corresponds to a bus bar having a length approximately twice as long in the stacking direction as the height of the battery module 100. The upper limit of the length of the long bus bar is not particularly limited.
　積層された複数の電池モジュール１００ａ、１００ｂ、１００ｃは、ケース１０の第１の側面１１に沿って配設された複数のバスバー７０Ｂ、７０Ｃによって、各電池モジュール１００ａ、１００ｂ、１００ｃの正極端子２０ｂ、２０ｃ及び負極端子２１ａ、２１ｂ、が、それぞれ接続されている。 The plurality of stacked battery modules 100a, 100b, 100c are connected to the positive terminal 20b of each battery module 100a, 100b, 100c by a plurality of bus bars 70B, 70C disposed along the first side surface 11 of the case 10. 20c and negative terminals 21a and 21b are connected to each other.
　例えば、図２及び図３（ａ）、（ｂ）に示した例では、中段の電池モジュール１００ｂの正極端子２０ｂは、バスバー７０Ｂによって、最上段の電池モジュール１００ａの負極端子２１ａに接続されている。また、最下段の電池モジュール１００ｃの正極端子２０ｃは、バスバー７０Ｃによって、中段の電池モジュール１００ｂの負極端子２１ｂに接続されている。これにより、電池モジュール１００ａ、１００ｂ、１００ｃは、電気的に直列接続されている。 For example, in the example shown in FIGS. 2 and 3A and 3B, the positive terminal 20b of the middle battery module 100b is connected to the negative terminal 21a of the uppermost battery module 100a by a bus bar 70B. . The positive terminal 20c of the lowermost battery module 100c is connected to the negative terminal 21b of the middle battery module 100b by a bus bar 70C. Thereby, battery module 100a, 100b, 100c is electrically connected in series.
　なお、電極片５０、６０のケース１０への取り付け、並びに、バスバー７０Ａ、７０Ｂ、７０Ｃの正極端子２０ｂ、２０ｃ、及び負極端子２１ａ、２１ｂへの取付は、例えば、それぞれに設けたボルト穴（又はネジ穴）同士を合わせて、ボルト（又はネジ）で締め付けることによって行うことができる。 The electrode pieces 50, 60 are attached to the case 10 and the bus bars 70A, 70B, 70C are attached to the positive terminals 20b, 20c and the negative terminals 21a, 21b, for example, by bolt holes (or It can be performed by aligning the screw holes) and tightening them with bolts (or screws).
　図４（ａ）及び（ｂ）は、長バスバー７０Ａ及びバスバー７０Ｂの構成を示した平面図である。また、図５（ａ）は、長バスバー７０Ａ及びバスバー７０Ｂの斜視図で、図５（ｂ）は、長バスバー７０Ａ及びバスバー７０Ｂがケース１０の第１の側面１１に沿って配設された状態を示した部分図である。なお、バスバー７０Ｃは、バスバー７０Ｂの構成と同じであるため、図面は省略する。 4 (a) and 4 (b) are plan views showing configurations of the long bus bar 70A and the bus bar 70B. 5A is a perspective view of the long bus bar 70A and the bus bar 70B, and FIG. 5B is a state in which the long bus bar 70A and the bus bar 70B are disposed along the first side surface 11 of the case 10. FIG. Since the bus bar 70C has the same configuration as the bus bar 70B, the drawing is omitted.
　図４（ａ）、（ｂ）に示すように、長バスバー７０Ａ及びバスバー７０Ｂは、各電池モジュール１００ａ、１００ｂ、１００ｃの正極端子２０ｂ、２０ｃ及び負極端子２１ａ、２１ｂ間を接続する金属接続体７１Ａ、７１Ｂと、金属接続体７１Ａ、７１Ｂの少なくとも正極端子２０ｂ、２０ｃ及び負極端子２１ａ、２１ｂとの接続部位７２Ａ、７２Ｂを除く部位を被覆する絶縁部材７３Ａ、７３Ｂとで構成されている。 As shown in FIGS. 4A and 4B, the long bus bar 70A and the bus bar 70B include a metal connector 71A that connects between the positive terminals 20b and 20c and the negative terminals 21a and 21b of the battery modules 100a, 100b, and 100c. , 71B and insulating members 73A, 73B covering portions other than the connecting portions 72A, 72B of at least the positive terminals 20b, 20c and the negative terminals 21a, 21b of the metal connectors 71A, 71B.
　図４（ｂ）、図５（ａ）に示すように、バスバー７０Ｂは、積層方向Ａに垂直な方向であって、長バスバー７０Ａ側に延出された延出部７４Ｂを有している。また、長バスバー７０Ａは、積層方向Ａに垂直な方向であって、バスバー７０Ｂ側に突出した突出部７４Ａを有している。 As shown in FIGS. 4B and 5A, the bus bar 70B has an extending portion 74B extending in the direction perpendicular to the stacking direction A and extending toward the long bus bar 70A. Further, the long bus bar 70A has a protruding portion 74A that is perpendicular to the stacking direction A and protrudes toward the bus bar 70B.
　そして、長バスバー７０Ａ及びバスバー７０Ｂが、図２に示すように、ケース１０の第１の側面１１に沿って配設されたとき、図５（ｂ）に示すように、バスバー７０Ｂの延出部７４Ｂは、長バスバー７０Ａの突出部７４Ａにおけるケース１０の第１の側面１１と平行な面に当接している。すなわち、長バスバー７０Ａは、当該長バスバー７０Ａの近傍にある他のバスバー７０Ｂの一部から延出された延出部７４Ｂよって支持されている。同様に、長バスバー７０Ａは、当該長バスバー７０Ａの近傍にある他のバスバー７０Ｃの一部から延出された延出部７４Ｃよって支持されている。 When the long bus bar 70A and the bus bar 70B are disposed along the first side surface 11 of the case 10 as shown in FIG. 2, as shown in FIG. 5B, the extended portion of the bus bar 70B. 74B is in contact with a surface parallel to the first side surface 11 of the case 10 in the protruding portion 74A of the long bus bar 70A. That is, the long bus bar 70A is supported by the extending portion 74B extending from a part of the other bus bar 70B in the vicinity of the long bus bar 70A. Similarly, the long bus bar 70A is supported by an extending portion 74C extending from a part of another bus bar 70C in the vicinity of the long bus bar 70A.
　図６に示すように、電池モジュール１００の積層方向Ａに延びる長バスバー７０Ａは、その両端にある接続部位７２Ａ、７２Ａを、電極片６０の第１の片６１及び負極端子２１ｃのみに固定しているだけで、それ以外の部分は、ケース１０に当接している部位を有していない。従って、このままの状態だと、図６の破線で示すように、長バスバー７０Ａは、接続部位７２Ａ、７２Ａを固定端として振動する。しかしながら、長バスバー７０Ａの中間部を、当該長バスバー７０Ａの近傍にある他のバスバー７０Ｂ、７０Ｃの一部から延出された延出部７４Ｂ、７４Ｃよって支持することにより、長バスバー７０Ａの振動を防止することができる。 As shown in FIG. 6, the long bus bar 70 </ b> A extending in the stacking direction A of the battery module 100 has the connection parts 72 </ b> A and 72 </ b> A at both ends thereof fixed only to the first piece 61 and the negative electrode terminal 21 c of the electrode piece 60. The other portions do not have a portion in contact with the case 10. Accordingly, in this state, the long bus bar 70A vibrates with the connection portions 72A and 72A as fixed ends, as shown by the broken line in FIG. However, by supporting the intermediate portion of the long bus bar 70A by the extended portions 74B and 74C extending from a part of the other bus bars 70B and 70C in the vicinity of the long bus bar 70A, the vibration of the long bus bar 70A is supported. Can be prevented.
　特に、バスバー７０Ｂ、７０Ｃの延出部７４Ｂ、７４Ｃは、長バスバー７０Ａの突出部７４Ａ、７４Ａにおけるケース１０の第１の側面１１と平行な面に当接しているため、図６に示したように、第１の側面１１に垂直な方向に大きく撓む長バスバー７０Ａの振動を、効果的に防止することができる。 In particular, since the extended portions 74B and 74C of the bus bars 70B and 70C are in contact with the surface parallel to the first side surface 11 of the case 10 in the protruding portions 74A and 74A of the long bus bar 70A, as shown in FIG. In addition, it is possible to effectively prevent the vibration of the long bus bar 70 </ b> A that is greatly bent in the direction perpendicular to the first side surface 11.
　これにより、長バスバー７０Ａを、余計な押さえ部材等を用いることなく、他のバスバー７０Ｂ、７０Ｃの一部に設けた延出部７４Ｂ、７４Ｃによって支持することにより、簡単な構成で、長バスバー７０Ａの撓みを防止することができる。これにより、長バスバー７０Ａの振動による強度低下を防止できるため、信頼性の高い電池パック２００が実現できる。 Thus, the long bus bar 70A is supported by the extended portions 74B and 74C provided in a part of the other bus bars 70B and 70C without using an extra pressing member or the like, so that the long bus bar 70A has a simple configuration. Can be prevented. Thereby, since the strength reduction by the vibration of the long bus bar 70A can be prevented, the battery pack 200 with high reliability can be realized.
　なお、長バスバー７０Ａを支持する近傍のバスバーは、必ずしも、長バスバー７０Ａに最も近いバスバーだけでなく、比較的離れたバスバーであってもよい。なお、当該バスバーは、延出部をできるだけ直線的に長バスバー７０Ａまで延出できるものが好ましい。 Note that the bus bar in the vicinity supporting the long bus bar 70A is not necessarily limited to the bus bar closest to the long bus bar 70A, but may be a bus bar that is relatively far away. In addition, the said bus bar has a preferable thing which can extend the extension part to the long bus bar 70A as linearly as possible.
　また、長バスバー７０Ａは、電池モジュール１００の積層方向Ａに延びる長さが、電池モジュール１００の高さに対して実質的に２倍以上のものであればよく、例えば、途中で、積層方向Ａに対して屈曲した部位を有するものも含む。 Further, the long bus bar 70 </ b> A only needs to have a length extending in the stacking direction A of the battery module 100 that is substantially twice or more the height of the battery module 100. Including those having a bent portion.
　また、バスバー７０Ｂ、７０Ｃの一部に設けた延出部７４Ｂ、７４Ｃは、絶縁部材のみで構成されていてもよい。例えば、バスバー７０Ｂ、７０Ｃの金属接続体７１Ｂを、樹脂にインサート成形することにより一体成形すれば、延出部７４Ｂ、７４Ｃを、樹脂により一体成形することができる。同様に、長バスバー７０Ａの一部に設けた突出部７４Ａは、絶縁部材のみで構成されていてもよい。例えば、バスバー７０Ａの金属接続体７１Ａを、樹脂にインサート成形することにより一体成形すれば、突出部７４Ａを、樹脂により一体成形することができる。 Further, the extending portions 74B and 74C provided in a part of the bus bars 70B and 70C may be configured only by an insulating member. For example, if the metal connector 71B of the bus bars 70B and 70C is integrally formed by insert molding in resin, the extending portions 74B and 74C can be integrally formed by resin. Similarly, the protruding portion 74A provided on a part of the long bus bar 70A may be configured only by an insulating member. For example, if the metal connector 71A of the bus bar 70A is integrally formed by insert molding in resin, the protrusion 74A can be integrally formed by resin.
　長バスバー７０Ａを、他のバスバー７０Ｂの延出部７４Ｂによって支持する形態は、図４に示した形態に限定されず、種々の形態を取りうる。 The form in which the long bus bar 70A is supported by the extending portion 74B of the other bus bar 70B is not limited to the form shown in FIG. 4 and can take various forms.
　図７（ａ）、（ｂ）及び図８（ａ）、（ｂ）は、長バスバー７０Ａを支持するバスバー７０Ｂの延出部７４Ｂの他の形態を例示した図である。 7 (a), 7 (b), 8 (a), and 8 (b) are diagrams illustrating other forms of the extending portion 74B of the bus bar 70B that supports the long bus bar 70A.
　図７（ａ）に例示した形態では、長バスバー７０Ａには、図５（ａ）に示したような突出部７４Ａは設けられていない。一方、バスバー７０Ｂの一部から積層方向Ａに垂直な方向に延出した延出部７４Ｂは、図７（ｂ）に示すように、長バスバー７０Ａにおけるケース１０の第１の側面１１と平行な面に当接するよう、屈曲して形成されている。これにより、図５（ａ）、（ｂ）に示した形態と同様に、第１の側面１１に垂直な方向に大きく撓む長バスバー７０の振動を、効果的に防止することができる。 7A, the long bus bar 70A is not provided with the protrusion 74A as shown in FIG. 5A. On the other hand, the extending part 74B extending in a direction perpendicular to the stacking direction A from a part of the bus bar 70B is parallel to the first side surface 11 of the case 10 in the long bus bar 70A as shown in FIG. It is bent so as to contact the surface. Thereby, similarly to the embodiment shown in FIGS. 5A and 5B, it is possible to effectively prevent the vibration of the long bus bar 70 that is greatly bent in the direction perpendicular to the first side surface 11.
　図８（ａ）に例示した形態では、長バスバー７０Ａには、ケース１０の第１の側面１１に垂直な面を有する突出部７５Ａ、７５Ａが形成されている。一方、バスバー７０Ｂの一部から延出した延出部７４Ｂは、図８（ｂ）に示すように、長バスバー７０Ａの突出部７５Ａにおけるケース１０の第１の側面１１と垂直な面に当接するよう、屈曲して形成されている。本例では、長バスバー７０Ａの突出部７５Ａと、バスバー７０Ｂの延出部７４Ｂとが互いに当接した面同士の摩擦力によって、第１の側面１１に垂直な方向に大きく撓む長バスバー７０の振動を防止することができる。 8A, the long bus bar 70A has protrusions 75A and 75A having surfaces perpendicular to the first side surface 11 of the case 10. As shown in FIG. On the other hand, the extended portion 74B extending from a part of the bus bar 70B comes into contact with a surface perpendicular to the first side surface 11 of the case 10 in the protruding portion 75A of the long bus bar 70A, as shown in FIG. So that it is bent. In this example, the length of the long bus bar 70 that is largely bent in the direction perpendicular to the first side surface 11 by the frictional force between the surfaces where the protruding portion 75A of the long bus bar 70A and the extending portion 74B of the bus bar 70B abut each other. Vibration can be prevented.
　本発明における電池パックは、積層された電池モジュールが、さらに積層方向Ａに垂直な方向に並列して配置されたものも含む。 The battery pack in the present invention includes a battery pack in which stacked battery modules are arranged in parallel in a direction perpendicular to the stacking direction A.
　図９及び図１０は、このように配置された電池パックの例を示した正面図である。 9 and 10 are front views showing examples of battery packs arranged in this way.
　図９に示した電池パックは、電池モジュール１００ａ、１００ｂ、１００ｃを積層した電池パック２００Ａ、２００Ｂを並列に配置したものである。 The battery pack shown in FIG. 9 is one in which battery packs 200A and 200B in which battery modules 100a, 100b, and 100c are stacked are arranged in parallel.
　電池パック２００Ａ、２００Ｂは、それぞれ、図３（ｂ）に示した電池パック２００と同様に、バスバー７０Ｂ、７０Ｃによって、電池モジュール１００ａ、１００ｂ、１００ｃが電気的に直列接続されている。そして、電池パック２００Ａと２００Ｂ同士は、電池パック２００Ａの最上段の電池モジュール１００ａの正極端子２０ａと、電池パック２００Ｂの最下段の電池モジュール１００ｃの負極端子２１ｃとを、長バスバー７０Ａで接続することによって、直列接続されている。 In the battery packs 200A and 200B, the battery modules 100a, 100b, and 100c are electrically connected in series by the bus bars 70B and 70C, respectively, similarly to the battery pack 200 shown in FIG. The battery packs 200A and 200B connect the positive terminal 20a of the uppermost battery module 100a of the battery pack 200A and the negative terminal 21c of the lowermost battery module 100c of the battery pack 200B with a long bus bar 70A. Are connected in series.
　ここで、長バスバー７０Ａは、電池パック２００Ａ側に配設されたバスバー７０Ｂの一部から延出した延出部７４Ｂによって支持されるとともに、電池パック２００Ｂ側に配設されたバスバー７０Ｃの一部から延出した延出部７４Ｃによって支持されている。 Here, the long bus bar 70A is supported by an extending portion 74B extending from a part of the bus bar 70B disposed on the battery pack 200A side, and a part of the bus bar 70C disposed on the battery pack 200B side. It is supported by an extending portion 74C extending from the outside.
　図１０（ａ）、（ｂ）に示した電池パックは、図９に示した電池パックと同様に、電池モジュール１００ａ、１００ｂ、１００ｃを積層した電池パック２００Ａ、２００Ｂを並列に配置したものである。 The battery pack shown in FIGS. 10A and 10B is configured by arranging battery packs 200A and 200B in which battery modules 100a, 100b, and 100c are stacked in parallel, similarly to the battery pack shown in FIG. .
　電池パック２００Ａでは、最上段の電池モジュール１００ａにおいて、電極片５０の第１の片５１ａが、ケース１０の第１の側面１１に取り付けられ、電極片５０の第２の片５２ａが、ケース１０の第２の側面１２に取り付けられている。さらに、電極片５０の第１の片５１ａは、ケース１０の第１の側面１１に沿って配設された長バスバー７０Ａによって、最下段の電池モジュール１００ｃの正極端子２０ｃに接続されている。これにより、電極片５０の第２の片５２ａは、電池パック２００Ａの正極外部端子を構成している。 In the battery pack 200 </ b> A, in the uppermost battery module 100 a, the first piece 51 a of the electrode piece 50 is attached to the first side surface 11 of the case 10, and the second piece 52 a of the electrode piece 50 is attached to the case 10. Attached to the second side surface 12. Furthermore, the first piece 51a of the electrode piece 50 is connected to the positive electrode terminal 20c of the battery module 100c at the lowest stage by a long bus bar 70A disposed along the first side surface 11 of the case 10. Thereby, the 2nd piece 52a of the electrode piece 50 comprises the positive electrode external terminal of battery pack 200A.
　同様に、電池パック２００Ｂでは、最上段の電池モジュール１００ａにおいて、電極片６０の第１の片６１ｂが、ケース１０の第１の側面１１に取り付けられ、電極片６０の第２の片６２ｂが、ケース１０の第２の側面１２に取り付けられている。さらに、電極片６０の第１の片６１ｂは、ケース１０の第１の側面１１に沿って配設された長バスバー７０Ａによって、最下段の電池モジュール１００ｃの負極端子２１ｃに接続されている。これにより、電極片６０の第２の片６２ｂは、電池パック２００Ｂの負極外部端子を構成している。 Similarly, in the battery pack 200B, in the uppermost battery module 100a, the first piece 61b of the electrode piece 60 is attached to the first side surface 11 of the case 10, and the second piece 62b of the electrode piece 60 is Attached to the second side surface 12 of the case 10. Further, the first piece 61 b of the electrode piece 60 is connected to the negative terminal 21 c of the lowermost battery module 100 c by a long bus bar 70 </ b> A disposed along the first side surface 11 of the case 10. Thereby, the 2nd piece 62b of the electrode piece 60 comprises the negative electrode external terminal of battery pack 200B.
　そして、電池パック２００Ａと２００Ｂとは、電池パック２００Ａの正極外部端子５２ａと、電池パック２００Ｂの負極外部端子６２ｂとを、ケース１０の第２の側面に沿って配設されたバスバー８０によって、直列接続されている。 Battery packs 200A and 200B are connected in series by positive electrode external terminal 52a of battery pack 200A and negative electrode external terminal 62b of battery pack 200B by bus bar 80 disposed along the second side surface of case 10. It is connected.
　ここで、電池パック２００Ａ側に配設された長バスバー７０Ａは、電池パック２００Ｂ側に配設された長バスバー７０Ａの一部から延出した延出部７４Ｂによって支持されるとともに、電池パック２００Ｂ側に配設された長バスバー７０Ａは、電池パック２００Ａ側に配設された長バスバー７０Ａの一部から延出した延出部７４Ｂによって支持されている。すなわち、電池パック２００Ａ、２００Ｂに配設された長バスバー７０Ａ、７０Ａは、互いに、当該長バスバー７０Ａ、７０Ａから延出された延出部７４Ｂ、７４Ｂによって支持し合っている。すなわち、長バスバー７０Ａを支持する他のバスバーは、長バスバーを含む。 Here, the long bus bar 70A disposed on the battery pack 200A side is supported by an extending portion 74B extending from a part of the long bus bar 70A disposed on the battery pack 200B side, and the battery pack 200B side The long bus bar 70A disposed on the battery pack 200A is supported by an extending portion 74B extending from a part of the long bus bar 70A disposed on the battery pack 200A side. That is, the long bus bars 70A and 70A arranged in the battery packs 200A and 200B are supported by the extended portions 74B and 74B extending from the long bus bars 70A and 70A. That is, the other bus bar that supports the long bus bar 70A includes a long bus bar.
　以上、本発明を好適な実施形態により説明してきたが、こうした記述は限定事項ではなく、もちろん、種々の改変が可能である。例えば、上記実施形態においては、長バスバー７０Ａは、その中間の２箇所の部位において、他のバスバー７０Ｂ、７０Ｃから延出された延出部７４Ｂ、７４Ｃによって支持されていたが、支持される部位の個数や場所は、これに限定されず、要求される仕様に応じて、適宜決めることができる。 As mentioned above, although this invention has been demonstrated by suitable embodiment, such description is not a limitation matter and of course various modifications are possible. For example, in the above-described embodiment, the long bus bar 70A is supported by the extended portions 74B and 74C extending from the other bus bars 70B and 70C at two intermediate positions, but is supported. The number and location of these are not limited to this, and can be appropriately determined according to the required specifications.
　また、上記実施形態においては、複数の電池モジュールが直列接続された電池パックを説明したが、これに減退されず、各電池モジュールが直列及び／又は並列接続された電池パックであってもよい。 In the above embodiment, a battery pack in which a plurality of battery modules are connected in series has been described. However, a battery pack in which each battery module is connected in series and / or in parallel is not limited thereto.
　また、上記実施形態では、複数の電池モジュールが積層された電池パックにおいて、積層方向に延びた長バスバーを、当該長バスバーの近傍にある他のバスバーの延出部によって支持した例を説明したが、これに限定されず、積層された電池モジュールが並列に配置された電池パックにおいて、積層方向に垂直な方向に延びるバスバーのうち、比較的長いバスバー（例えば、電池モジュールの幅に対して、２倍以上の長さを有する長バスバー）を、その近傍にある他のバスバーの一部から延出された延出部よって支持するようにしてもよい。この場合、当該長バスバーは、その近傍にある他のバスバーの一部から、積層方向に延びた前記延出部によって支持されているのが好ましい。 In the above embodiment, in the battery pack in which a plurality of battery modules are stacked, the example in which the long bus bar extending in the stacking direction is supported by the extending portion of another bus bar in the vicinity of the long bus bar is described. However, the present invention is not limited to this, and in a battery pack in which stacked battery modules are arranged in parallel, among bus bars extending in a direction perpendicular to the stacking direction, a relatively long bus bar (for example, 2 with respect to the width of the battery module). You may make it support the long bus bar which has a length more than twice by the extension part extended from some other bus bars in the vicinity. In this case, it is preferable that the said long bus bar is supported by the said extension part extended in the lamination direction from some other bus bars in the vicinity.
　また、上記実施形態では、所定の長さの長バスバーを、その近傍にある他のバスバーの延出部で支持した例を説明したが、支持されるバスバーは、必ずしも長バスバーでなくいてよい。例えば、大型化された電池モジュールが積層された電池パックにおいては、隣接する電池モジュール間を接続するバスバーでも、電池パックに外力が加わったとき、バスバーの振幅が大きくなって、バスバーに大きな撓みが発生する畏れがある。従って、このような場合には、複数のバスバーのうち、少なくとも一のバスバーを、当該バスバーの近傍にある他のバスバーの一部から延出された延出部よって支持することにより、バスバーの強度低下を防止することができる。 In the above embodiment, an example in which a long bus bar having a predetermined length is supported by an extension portion of another bus bar in the vicinity thereof is described. However, the supported bus bar is not necessarily a long bus bar. For example, in a battery pack in which enlarged battery modules are stacked, even when a bus bar connects between adjacent battery modules, when an external force is applied to the battery pack, the amplitude of the bus bar increases and the bus bar is greatly bent. There is a drought that occurs. Therefore, in such a case, the strength of the bus bar can be obtained by supporting at least one bus bar among a plurality of bus bars by an extension portion extending from a part of another bus bar in the vicinity of the bus bar. A decrease can be prevented.
　本発明は、自動車、電動バイク又は電動遊具等の駆動用電源として有用である。 The present invention is useful as a power source for driving automobiles, electric motorcycles, electric playground equipment and the like.
　１０　　　ケース 
　１１　　　第１の側面（一側面） 
　１２　　　第２の側面 
　２０、２０ａ、２０ｂ、２０ｃ　　　正極端子 
　２１、２１ａ、２１ｂ、２１ｃ　　　負極端子 
　４０　　　連結部 
　５０、６０　　　電極片 
　５１、６１　　　第１の片 
　５２、６２　　　第２の片 
　５２ａ　　正極外部端子 
　６２ｂ　　負極外部端子 
　７０Ａ　　長バスバー 
　７０Ｂ、７０Ｃ　　バスバー 
　７１Ａ、７１Ｂ　　金属接続体 
　７２Ａ、７２Ｂ　　接続部位 
　７３Ａ、７３Ｂ　　絶縁部材 
　７４Ａ、７４Ｂ　　突出部 
　７４Ｂ、７４　　　延出部 
　７４Ｂ、７４Ｃ　　延出部 
　７５Ａ　　突出部 
　８０　　　バスバー 
　１００、１００ａ、１００ｂ、１００ｃ　　電池モジュール 
　２００、２００Ａ、２００Ｂ　　　電池パック  10 cases
11 First side (one side)
12 Second side
20, 20a, 20b, 20c Positive terminal
21, 21a, 21b, 21c Negative terminal
40 connections
50, 60 electrode pieces
51, 61 first piece
52, 62 second piece
52a Positive external terminal
62b Negative external terminal
70A long bus bar
70B, 70C Busbar
71A, 71B Metal connector
72A, 72B Connection site
73A, 73B Insulating member
74A, 74B Projection
74B, 74 extension
74B, 74C extension
75A protrusion
80 Busbar
100, 100a, 100b, 100c battery module
200, 200A, 200B battery pack

Claims (11)

  1. 　複数の電池がケース内に収容された電池モジュールが積層された電池パックであって、
    　前記電池モジュールは、前記ケースの一側面に正極端子及び負極端子が配設されており、
    　前記複数の電池モジュールは、前記ケースの一側面に沿って配設された複数のバスバーによって、各電池モジュールの前記正極端子及び前記負極端子が、それぞれ接続されており、
    　前記バスバーは、前記各電池モジュールの前記正極端子及び前記負極端子間を接続する金属接続体と、該金属接続体を被覆する絶縁部材とで構成されており、
    　前記複数のバスバーのうち、少なくとも一のバスバーは、該一のバスバーの近傍にある他のバスバーの一部から延出された延出部よって支持されている、電池パック。     A battery pack in which a battery module in which a plurality of batteries are housed in a case is laminated,
    The battery module is provided with a positive terminal and a negative terminal on one side of the case,
    The plurality of battery modules are connected to the positive terminal and the negative terminal of each battery module by a plurality of bus bars arranged along one side of the case, respectively.
    The bus bar is composed of a metal connector that connects between the positive electrode terminal and the negative electrode terminal of each battery module, and an insulating member that covers the metal connector,
    The battery pack, wherein at least one bus bar among the plurality of bus bars is supported by an extending portion extending from a part of another bus bar in the vicinity of the one bus bar.
  2. 　前記一のバスバーは、前記電池モジュールの積層方向に延び、かつ、前記電池モジュールの高さに対して、積層方向に２倍以上の長さを有する長バスバーである、請求項１に記載の電池パック。 2. The battery according to claim 1, wherein the one bus bar is a long bus bar that extends in the stacking direction of the battery modules and has a length that is twice or more in the stacking direction with respect to the height of the battery modules. pack.
  3. 　前記長バスバーは、前記他のバスバーの一部から、積層方向に垂直な方向に延びた前記延出部によって支持されている、請求項２に記載の電池パック。 The battery pack according to claim 2, wherein the long bus bar is supported by the extending portion extending in a direction perpendicular to the stacking direction from a part of the other bus bar.
  4. 　前記延出部は、前記長バスバーにおける前記ケースの一側面と平行な面に当接している、請求項２に記載の電池パック。 The battery pack according to claim 2, wherein the extending portion is in contact with a surface parallel to one side surface of the case in the long bus bar.
  5. 　前記長バスバーは、積層方向に垂直な方向に突出した突出部を有し、
    　前記延出部は、前記突出部における前記ケースの一側面と平行な面に当接している、請求項４に記載の電池パック。     The long bus bar has a protruding portion protruding in a direction perpendicular to the stacking direction,
    The battery pack according to claim 4, wherein the extending portion is in contact with a surface of the protruding portion parallel to one side surface of the case.
  6. 　前記延出部は、前記絶縁部材のみで構成されている、請求項１に記載の電池パック。 The battery pack according to claim 1, wherein the extending portion is configured by only the insulating member.
  7. 　前記突出部は、前記絶縁部材のみで構成されている、請求項５に記載の電池パック。 The battery pack according to claim 5, wherein the protruding portion is configured only by the insulating member.
  8. 　前記バスバーは、前記金属接続体を、樹脂にインサート成形することにより一体成形されたものである、請求項１に記載の電池パック。 The battery pack according to claim 1, wherein the bus bar is integrally formed by insert-molding the metal connector into a resin.
  9. 　前記一のバスバーは、前記正極端子及び前記負極端子以外に、前記ケースに当接している部位を有していない、請求項１に記載の電池パック。 2. The battery pack according to claim 1, wherein the one bus bar does not have a portion in contact with the case other than the positive electrode terminal and the negative electrode terminal.
  10. 　前記積層された電池モジュールは、さらに並列に配列されており、
    　前記一のバスバーは、前記電池モジュールの積層方向に垂直な方向に延び、かつ、前記電池モジュールの幅に対して、２倍以上の長さを有する長バスバーである、請求項１に記載の電池パック。     The stacked battery modules are further arranged in parallel,
    2. The battery according to claim 1, wherein the one bus bar is a long bus bar that extends in a direction perpendicular to a stacking direction of the battery modules and has a length that is twice or more the width of the battery module. pack.
  11. 　前記長バスバーは、前記他のバスバーの一部から、積層方向に延びた前記延出部によって支持されている、請求項１０に記載の電池パック。 The battery pack according to claim 10, wherein the long bus bar is supported by the extending portion extending in a stacking direction from a part of the other bus bar.
PCT/JP2012/004164 2011-08-10 2012-06-27 Battery pack WO2013021538A1 (en)

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JP2011174844 2011-08-10

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