WO2014065110A1 - Gas discharge structure for battery module - Google Patents

Gas discharge structure for battery module Download PDF

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Publication number
WO2014065110A1
WO2014065110A1 PCT/JP2013/077284 JP2013077284W WO2014065110A1 WO 2014065110 A1 WO2014065110 A1 WO 2014065110A1 JP 2013077284 W JP2013077284 W JP 2013077284W WO 2014065110 A1 WO2014065110 A1 WO 2014065110A1
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WO
WIPO (PCT)
Prior art keywords
cell unit
partition wall
internal pressure
pressure release
battery module
Prior art date
Application number
PCT/JP2013/077284
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French (fr)
Japanese (ja)
Inventor
尚美 長田
毅之 小久保
徹夫 佐々木
森田　剛
卓弥 島本
Original Assignee
日産自動車株式会社
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Publication date
Application filed by 日産自動車株式会社 filed Critical 日産自動車株式会社
Priority to JP2014543217A priority Critical patent/JP5939307B2/en
Publication of WO2014065110A1 publication Critical patent/WO2014065110A1/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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0481—Compression means other than compression means for stacks of electrodes and separators
    • 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
    • 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
    • H01M50/24—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 from their environment, e.g. from corrosion
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/30—Arrangements for facilitating escape of gases
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/30—Arrangements for facilitating escape of gases
    • H01M50/342—Non-re-sealable arrangements
    • 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 gas discharge structure of a battery module constituting an assembled battery mounted on an electric vehicle or a hybrid vehicle.
  • Patent Document 1 when gas is generated in the cell due to overcharge, the high temperature and high pressure gas is not released from the module case as it is, and an opening forming means provided in the outer casing of the cell is provided in the module case.
  • a battery module having an arrangement configuration in which the formed through-holes do not face each other is disclosed.
  • the present invention is a battery module capable of avoiding the outflow from the internal pressure release portion provided in the module case as it is to the outside regardless of where the cell film bonding portion is opened and the generated gas is released.
  • An object of the present invention is to provide a gas discharge structure.
  • the gas discharge structure of the battery module according to the present invention includes a cell unit in which a plurality of cells are stacked, a module case containing the cell unit, and a gas penetrating through the module case to discharge the gas accumulated inside.
  • the partition is arranged so as to shield a straight line connecting the internal pressure release portion and the outer peripheral edge of the cell unit.
  • the partition wall is always standing in front of the pressure release portion.
  • the substance can be prevented from flowing out to the outside directly by being blocked by the partition wall. Further, since the gas itself collides with the partition wall and the inner surface of the module case and detours, the effect of lowering the temperature is obtained.
  • FIG. 1 is a schematic perspective view showing a first embodiment of the present invention.
  • FIG. 2 is a schematic side cross-sectional view of the battery module shown in FIG. 1.
  • FIG. 3 is a cross-sectional view taken along line AA in FIG. 2.
  • Sectional drawing which follows the BB line of FIG. Sectional drawing similar to FIG. 4 which shows 2nd Embodiment of this invention.
  • Sectional drawing similar to FIG. 4 which shows 3rd Embodiment of this invention.
  • Sectional drawing similar to FIG. 2 which shows 4th Embodiment of this invention.
  • Sectional drawing similar to FIG. 4 which shows 5th Embodiment of this invention.
  • the schematic perspective view which shows 6th Embodiment of this invention.
  • FIG. 1 is a schematic perspective view showing a first embodiment of the present invention.
  • FIG. 2 is a schematic side cross-sectional view of the battery module shown in FIG. 1.
  • FIG. 3
  • FIG. 11 is a schematic side cross-sectional view of the battery module shown in FIG. 10.
  • FIG. 13 is a schematic side cross-sectional view of the battery module shown in FIG. 12.
  • FIG. 13 is a schematic plan sectional view of the battery module shown in FIG. 12.
  • FIG. 1 shows the overall configuration of a first embodiment of a battery module according to the present invention, and in particular, the module case 4 is seen through to show the internal configuration of the module case 4.
  • the battery module 1 includes a cell unit 3 in which a plurality of thin rectangular cells 2 are stacked vertically, a module case 4 having a rectangular box shape containing the cell units 3, and a module case 4 penetratingly disposed.
  • the internal pressure release part 5 that discharges the gas accumulated inside to the outside and the partition wall 6 disposed between the cell unit 3 and the internal pressure release part 5 are provided.
  • the cell 2 is referred to as a laminate type cell in which the periphery of two film materials laminated by laminating a resin layer with an aluminum layer in between is bonded to each other and the power generation element is sealed.
  • the cell 2 has an explosion-proof valve 2a on one side, and when gas is generated due to overcharging, the explosion-proof valve 2a is opened to release the generated gas.
  • the module case 4 is made of a light metal having good thermal conductivity, such as aluminum or aluminum alloy, and the internal pressure releasing portion 5 is one end wall in the length direction of the module case 4 (the stacking direction of the cells 2). It is set at the bottom center of.
  • a constant pressure valve that opens when the internal pressure of the module case 4 becomes a predetermined value or more can be used, or it can be configured as a simple opening.
  • the cell unit 3 is configured by stacking a plurality of cells 2 vertically as described above by a binding means.
  • the cell 2 stack is sandwiched between the pair of end plates 7 in the length direction (stacking direction), the binding bolts 8 are passed through the four corners, and the binding bolts 8 are tightly fastened. ing.
  • the end plate 7 is made of a light metal having good heat conductivity, such as aluminum or aluminum alloy, like the module case 4, and has a flange 7a at the lower end as shown in FIG. 2, and the module is interposed through the flange 7a.
  • the case 4 is fastened and fixed to the inner surface of the bottom wall.
  • the cell binding end plate 7 disposed at the end in the length direction of the cell unit 3 is used as the partition wall 6 described above.
  • the end plates 7 arranged at both end portions in the length direction of the cell unit 3 are all formed sufficiently larger than the width and height dimensions of the cell unit 3 and contact the inner surfaces of both side walls in the width direction of the module case 4.
  • the partition wall is in contact with and close to the inner surface of the upper wall and separates the arrangement portion of the cell unit 3 (see FIG. 3).
  • the internal pressure release portion 5 and the outer peripheral edge of the cell unit 3 are separated by the partition wall 6 (that is, the end plate 7) facing the one end wall in the length direction where the internal pressure release portion 5 of the module case 4 is provided.
  • the straight line L connecting the two is blocked (see FIGS. 2 and 4).
  • the partition wall 6 (end plate 7) is provided over the entire circumference of one end surface of the cell unit 3 so as to intersect with the straight line L connecting the internal pressure release portion 5 and the outer peripheral edge of the cell unit 3. Yes.
  • the pair of end plates 7 have the same size, but the end plate 7 facing the other end wall of the module case 4 where the internal pressure releasing portion 5 is not provided may be small. .
  • the generated gas when gas is generated in the cell 2 due to overcharge, the generated gas is released into the module case 4 by opening the explosion-proof valve 2a due to an increase in internal pressure.
  • the filled gas is discharged from the internal pressure release part 5 to the outside of the case 4.
  • the gas released from the explosion-proof valve 2a of the cell 2 passes through the gap between the side surface of the cell unit 3 and the side wall of the module case 4 as shown by the arrow a in FIG. It flows toward.
  • the flow is once blocked by the partition wall 6 and directed upward in the case 4. Then, it passes over the upper end of the partition wall 6 and flows downward in the case 4 toward the internal pressure release portion 5, and is discharged from the internal pressure release portion 5 to the outside of the case 4.
  • the high-temperature and high-pressure gas released from the explosion-proof valve 2a of the cell 2 is repeatedly detoured due to the presence of the partition wall 6 in the flow process toward the internal pressure release portion 5, thereby generating power generation elements included in the gas.
  • the combustible substance is prevented from flowing out directly from the internal pressure release portion 5.
  • the partition wall 6 is arranged so as to shield the straight line L connecting the internal pressure release portion 5 provided in the module case 4 and the outer peripheral edge of the cell unit 3 as described above.
  • the partition wall 6 regardless of the position where the bonded portion of the film of the cell 2 other than the explosion-proof valve 2a is opened and the generated gas is released, the partition wall 6 always stands in front of the pressure release portion 5, and the above gas flow The detouring effect is obtained. Accordingly, it is possible to obtain the effect of preventing direct inflow of the combustible substance and the gas temperature lowering effect.
  • FIG. 5 shows a second embodiment of the present invention.
  • the partition wall 6 includes one end wall of the module case 4 provided with the internal pressure release portion 5 and one end portion of the cell unit 3. It is arranged at an intermediate position.
  • the dimension can be shortened to about the width dimension of the cell unit 3, and the partition wall 6 can be reduced in size and weight.
  • FIG. 6 shows a third embodiment of the present invention.
  • the internal pressure releasing portion 5 is set at a position offset toward one corner of the end wall of the module case 4.
  • the partition wall 6 is arranged so as to be offset to one side in the width direction of the module case 4 corresponding to the internal pressure release portion 5.
  • the width direction dimension of the partition wall 6 that can shield the straight line L can be shortened as much as possible.
  • the partition wall 6 can be further reduced in size and weight.
  • FIG. 7 shows several different examples of the partition wall 6.
  • the overall shape of the partition wall 6 shown in FIG. 7A is a bellows-like uneven shape.
  • the partition 6 shown in (b) of the figure has a louver structure at the center surrounded by the peripheral edge.
  • the partition wall 6 shown in (c) of the figure has a mesh structure at the center surrounded by the peripheral edge.
  • the partition wall 6 shown in (d) has a porous structure at the center surrounded by the peripheral edge.
  • the gas moving distance can be increased and the gas contact area can be increased, so that the gas cooling effect can be enhanced.
  • FIG. 8 shows a fourth embodiment of the present invention.
  • a bottom wall extending toward the center in the length direction of the cell unit 3 at the lower end of the end plate 7 constituting the partition wall 6 in the first embodiment.
  • a portion 7 b is provided, and the bottom wall portion 7 b is in surface contact with the bottom wall of the module case 4.
  • FIG. 9 shows a fifth embodiment of the present invention.
  • the side wall of the module case 4 integrally provided with the partition wall 6 has an uneven shape.
  • the heat radiation action of the side wall is enhanced as shown by the arrow h, and the side wall of the partition wall 6 and the module case 4 is increased.
  • the cooling effect of the gas that collides with the gas can be enhanced.
  • FIGS. 10 and 11 show a sixth embodiment of the present invention, in which a plurality of partition walls are used, and this is multistage so that the gas outflow path snakes between the cell unit 3 and the internal pressure release portion 5. It is arranged.
  • the internal pressure releasing portion 5 in the first embodiment is set at the upper center of one end wall of the module case 4. Then, a second partition 6A different from the partition 6 constituted by the end plate 7 is disposed at an intermediate position between the internal pressure release portion 5 and the end plate 7 facing the internal pressure release portion 5. The second partition 6A is attached to the upper wall of the module case 4 and extends downward.
  • the gas that is blocked and directed upward in the case 4 gets over the partition wall 6 and flows downward in the case 4, passes through the lower end of the second partition wall 6 ⁇ / b> A, and flows upward toward the internal pressure release portion 5.
  • the gas moving distance can be increased and the gas contact area can be increased, the effect of preventing direct flammable substances from flowing directly outside the gas can be enhanced, It is possible to improve the gas temperature lowering effect.
  • the explosion-proof valve 2a is provided in the cell 2 and the cell opening position at the time of gas generation is specified.
  • the present invention is not limited to this.
  • the present invention can also be applied to a battery module in which each cell 2 does not include the explosion-proof valve 2a.
  • the partition wall 6 is provided in the module case 4, but the present invention is not limited to this, and for example, the cell 2 or the cell unit 3 may be configured to support the partition wall 6. Good.
  • FIGS. 12 to 14 show a seventh embodiment of the present invention in which the cell unit 3 supports the partition wall 6.
  • the internal pressure releasing portion 5 is provided on one side wall of the module case 4.
  • the internal pressure release portion 5 is arranged at the center of the side wall of the module case 4 on the same side as the explosion-proof valve 2 a of each cell 2.
  • a cell unit 3 formed by laminating a plurality of cells 2 has a pair of end plates 7 at both ends, and is fixed in the module case 4 via the end plates 7.
  • the partition wall 6 is made of a rectangular metal plate, and is disposed on one side surface of the cell unit 3, particularly on the side surface facing the internal pressure release portion 5.
  • the partition wall 6 has a size that covers the entire side surface of the cell unit 3, and both end portions are attached to the end plate 7.
  • the partition wall 6 can also be configured by using a terminal connection substrate for connecting the terminals of the cells 2 of the cell unit 3 to each other.
  • the terminal connection board to be the partition wall 6 is made of a synthetic resin board including a metal bus bar, and is attached to one side surface of the cell unit 3 as in FIGS.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Gas Exhaust Devices For Batteries (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

The present invention configures a cell unit (3) by stacking a plurality of cells (2) with end plates (7) on both ends, and stores the cell unit (3) inside a module case (4). Each cell (2) has an explosion-prevention valve (2a). One end-section wall of the module case (4) is provided with an internal-pressure release part (5). The end plate (7) functions as a partition (6) as a result of setting the size of the end plate (7) in a manner such that a straight line (L) connecting the outer-peripheral edges of the cell unit (3) and the internal-pressure release part (5) is blocked. As a result, the partition (6) prevents a direct release even when the attachment section of the film of the cells (2) becomes unsealed and a generated gas is discharged.

Description

電池モジュールのガス排出構造Battery module gas discharge structure
　本発明は、電気自動車やハイブリッド車に搭載される組電池を構成する電池モジュールのガス排出構造に関する。 The present invention relates to a gas discharge structure of a battery module constituting an assembled battery mounted on an electric vehicle or a hybrid vehicle.
　特許文献１には、過充電によりセルにガスが発生した場合に、この高温高圧のガスがモジュールケースからそのまま放出されないように、セルの外装体に設けられた開口形成手段と、モジュールケースに設けられた貫通孔とが対向しない配置構成とした電池モジュールが開示されている。 In Patent Document 1, when gas is generated in the cell due to overcharge, the high temperature and high pressure gas is not released from the module case as it is, and an opening forming means provided in the outer casing of the cell is provided in the module case. A battery module having an arrangement configuration in which the formed through-holes do not face each other is disclosed.
　しかし、発電要素を密封した外装体がフィルム材で形成されたラミネート型のセルは、ガス発生により内圧が上昇したときに開口形成手段（防爆弁）以外の部分でフィルムの貼り合わせ部が開封することがある。従って、特許文献１の開示技術では、モジュールケースの貫通孔に対向した部分でこの開封が生じると、高温，高圧のガスがそのままモジュールケース外に放出される可能性があり、モジュールケース外に樹脂製等の部品があった場合、部品の劣化を招く恐れがある。 However, in a laminate-type cell in which the outer package that seals the power generating element is formed of a film material, when the internal pressure rises due to gas generation, the bonded portion of the film is opened at a portion other than the opening forming means (explosion-proof valve). Sometimes. Therefore, in the disclosed technique of Patent Document 1, if this opening occurs at a portion facing the through hole of the module case, there is a possibility that high-temperature and high-pressure gas is released as it is outside the module case. If there are parts such as manufactured parts, the parts may be deteriorated.
　本発明は、セルのフィルムの貼り合わせ部がどの位置で開封して発生ガスが放出しても、モジュールケースに設けられた内圧開放部からそのまま外部へ流出するのを回避することができる電池モジュールのガス排出構造を提供することを目的とする。 The present invention is a battery module capable of avoiding the outflow from the internal pressure release portion provided in the module case as it is to the outside regardless of where the cell film bonding portion is opened and the generated gas is released. An object of the present invention is to provide a gas discharge structure.
特開２００５－３２２４３４号公報JP 2005-322434 A
　本発明の電池モジュールのガス排出構造は、複数のセルを積層したセルユニットと、前記セルユニットを収納したモジュールケースと、前記モジュールケースに貫通配置されて、内部に溜まったガスを外部に放出する内圧開放部と、前記セルユニットと前記内圧開放部との間に配置した隔壁と、を備えている。 The gas discharge structure of the battery module according to the present invention includes a cell unit in which a plurality of cells are stacked, a module case containing the cell unit, and a gas penetrating through the module case to discharge the gas accumulated inside. An internal pressure release portion, and a partition wall disposed between the cell unit and the internal pressure release portion.
　そして、前記隔壁は、前記内圧開放部と前記セルユニットの外周縁とを結ぶ直線を遮蔽するように配置されている。 The partition is arranged so as to shield a straight line connecting the internal pressure release portion and the outer peripheral edge of the cell unit.
　本発明によれば、セルのフィルムの貼り合わせ部がどの位置で開封して発生ガスが放出しても、必ず圧力開放部の前には隔壁が立ちはだかっているので、発生ガスに含まれる可燃性物質は隔壁に妨げられて直接外部へ流出するのを防止できる。また、ガス自体も隔壁およびモジュールケース内面に衝突して迂回することから温度を下げる効果が得られる。 According to the present invention, even if the cell film laminating portion is opened at any position and the generated gas is released, the partition wall is always standing in front of the pressure release portion. The substance can be prevented from flowing out to the outside directly by being blocked by the partition wall. Further, since the gas itself collides with the partition wall and the inner surface of the module case and detours, the effect of lowering the temperature is obtained.
本発明の第１実施形態を示す略示的な斜視図。1 is a schematic perspective view showing a first embodiment of the present invention. 図１に示した電池モジュールの略示的な側面断面図。FIG. 2 is a schematic side cross-sectional view of the battery module shown in FIG. 1. 図２のＡ－Ａ線に沿う断面図。FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. 図２のＢ－Ｂ線に沿う断面図。Sectional drawing which follows the BB line of FIG. 本発明の第２実施形態を示す図４と同様の断面図。Sectional drawing similar to FIG. 4 which shows 2nd Embodiment of this invention. 本発明の第３実施形態を示す図４と同様の断面図。Sectional drawing similar to FIG. 4 which shows 3rd Embodiment of this invention. 隔壁の各異なる例（ａ）～（ｄ）を示す図。The figure which shows each different example (a)-(d) of a partition. 本発明の第４実施形態を示す図２と同様の断面図。Sectional drawing similar to FIG. 2 which shows 4th Embodiment of this invention. 本発明の第５実施形態を示す図４と同様の断面図。Sectional drawing similar to FIG. 4 which shows 5th Embodiment of this invention. 本発明の第６実施形態を示す略示的な斜視図。The schematic perspective view which shows 6th Embodiment of this invention. 図１０に示した電池モジュールの略示的な側面断面図。FIG. 11 is a schematic side cross-sectional view of the battery module shown in FIG. 10. 本発明の第７実施形態を示す略示的な斜視図。The schematic perspective view which shows 7th Embodiment of this invention. 図１２に示した電池モジュールの略示的な側面断面図。FIG. 13 is a schematic side cross-sectional view of the battery module shown in FIG. 12. 図１２に示した電池モジュールの略示的な平面断面図。FIG. 13 is a schematic plan sectional view of the battery module shown in FIG. 12.
　以下、本発明の実施形態を図面と共に詳述する。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
　図１は、本発明に係る電池モジュールの第１実施形態の全体構成を示し、特に、モジュールケース４内部の構成を示すためにモジュールケース４を透視して示している。 FIG. 1 shows the overall configuration of a first embodiment of a battery module according to the present invention, and in particular, the module case 4 is seen through to show the internal configuration of the module case 4.
　電池モジュール１は、薄型矩形状の複数のセル２を縦置きに積層したセルユニット３と、該セルユニット３を収納した矩形の箱状をなすモジュールケース４と、モジュールケース４に貫通配置されて、内部に溜まったガスを外部に放出する内圧開放部５と、これらセルユニット３と内圧開放部５との間に配置した隔壁６と、を備えている。 The battery module 1 includes a cell unit 3 in which a plurality of thin rectangular cells 2 are stacked vertically, a module case 4 having a rectangular box shape containing the cell units 3, and a module case 4 penetratingly disposed. The internal pressure release part 5 that discharges the gas accumulated inside to the outside and the partition wall 6 disposed between the cell unit 3 and the internal pressure release part 5 are provided.
　セル２は、アルミ層を中間にして樹脂層を積層してラミネート加工した２枚のフィルム材の周囲を互いに貼り合わせて発電要素を密封したラミネート型セルと称されるものである。このセル２は、一側部に防爆弁２ａを備えて、過充電によりガスが発生した場合に、該防爆弁２ａが開弁して発生ガスを放出可能としている。 The cell 2 is referred to as a laminate type cell in which the periphery of two film materials laminated by laminating a resin layer with an aluminum layer in between is bonded to each other and the power generation element is sealed. The cell 2 has an explosion-proof valve 2a on one side, and when gas is generated due to overcharging, the explosion-proof valve 2a is opened to release the generated gas.
　モジュールケース４は、アルミ，アルミ合金等の軽量で熱伝導性の良好な金属からなり、上述の内圧開放部５はモジュールケース４の長さ方向（セル２の積層方向）の一方の端部壁の下部中央に設定してある。 The module case 4 is made of a light metal having good thermal conductivity, such as aluminum or aluminum alloy, and the internal pressure releasing portion 5 is one end wall in the length direction of the module case 4 (the stacking direction of the cells 2). It is set at the bottom center of.
　この内圧開放部５として、モジュールケース４の内圧が所定値以上となると開弁する定圧弁を用いたり、単なる開口として構成することができる。 As the internal pressure release portion 5, a constant pressure valve that opens when the internal pressure of the module case 4 becomes a predetermined value or more can be used, or it can be configured as a simple opening.
　セルユニット３は、複数のセル２を結束手段により上述のように縦置きに積層して構成される。本実施形態にあっては一対のエンドプレート７でセル２の積層体を長さ方向（積層方向）に挟んで、４隅部に結束ボルト８を貫通させて、該結束ボルト８で緊締結束している。 The cell unit 3 is configured by stacking a plurality of cells 2 vertically as described above by a binding means. In this embodiment, the cell 2 stack is sandwiched between the pair of end plates 7 in the length direction (stacking direction), the binding bolts 8 are passed through the four corners, and the binding bolts 8 are tightly fastened. ing.
　エンドプレート７は、モジュールケース４と同様にアルミ，アルミ合金等の軽量で熱伝導性の良好な金属からなり、図２に示すように下端にフランジ７ａを備えて、該フランジ７ａを介してモジュールケース４の底壁内面に締結固定するようにしている。 The end plate 7 is made of a light metal having good heat conductivity, such as aluminum or aluminum alloy, like the module case 4, and has a flange 7a at the lower end as shown in FIG. 2, and the module is interposed through the flange 7a. The case 4 is fastened and fixed to the inner surface of the bottom wall.
　本実施形態ではこのセルユニット３の長さ方向端部に配置したセル結束用のエンドプレート７を、上述の隔壁６として利用している。 In this embodiment, the cell binding end plate 7 disposed at the end in the length direction of the cell unit 3 is used as the partition wall 6 described above.
　即ち、セルユニット３の長さ方向両端部に配置したエンドプレート７は、何れもセルユニット３の幅および高さ寸法よりも十分に大きく形成され、モジュールケース４の幅方向両側壁の内面に当接すると共に上壁内面の近傍にまで存在して、セルユニット３の配置部分を隔成する隔壁としている（図３参照）。 That is, the end plates 7 arranged at both end portions in the length direction of the cell unit 3 are all formed sufficiently larger than the width and height dimensions of the cell unit 3 and contact the inner surfaces of both side walls in the width direction of the module case 4. The partition wall is in contact with and close to the inner surface of the upper wall and separates the arrangement portion of the cell unit 3 (see FIG. 3).
　このように、モジュールケース４の内圧開放部５を設けた長さ方向の一方の端部壁に対向した隔壁６（つまりエンドプレート７）により、この内圧開放部５とセルユニット３の外周縁とを結ぶ直線Ｌが遮蔽される（図２，図４参照）。換言すれば、セルユニット３の一端面の全周に亘って、内圧開放部５とセルユニット３の外周縁とを結ぶ直線Ｌと交差するように、隔壁６（エンドプレート７）が設けられている。 In this way, the internal pressure release portion 5 and the outer peripheral edge of the cell unit 3 are separated by the partition wall 6 (that is, the end plate 7) facing the one end wall in the length direction where the internal pressure release portion 5 of the module case 4 is provided. The straight line L connecting the two is blocked (see FIGS. 2 and 4). In other words, the partition wall 6 (end plate 7) is provided over the entire circumference of one end surface of the cell unit 3 so as to intersect with the straight line L connecting the internal pressure release portion 5 and the outer peripheral edge of the cell unit 3. Yes.
　図示する例では、一対のエンドプレート７を同じ大きさとしているが、モジュールケース４の内圧開放部５を設けていない他方の端部壁に対向するエンドプレート７は小型のものであってもよい。 In the illustrated example, the pair of end plates 7 have the same size, but the end plate 7 facing the other end wall of the module case 4 where the internal pressure releasing portion 5 is not provided may be small. .
　この第１実施形態の構成によれば、過充電によりセル２内にガスが発生した場合、内圧の上昇により防爆弁２ａが開いて発生したガスがモジュールケース４内に放出される。 According to the configuration of the first embodiment, when gas is generated in the cell 2 due to overcharge, the generated gas is released into the module case 4 by opening the explosion-proof valve 2a due to an increase in internal pressure.
　そして、モジュールケース４内にガスが充満するようになると、内圧開放部５から充満したガスがケース４外へ放出される。 Then, when the gas in the module case 4 is filled, the filled gas is discharged from the internal pressure release part 5 to the outside of the case 4.
　このとき、上述のようにセル２の防爆弁２ａから放出されるガスは、図１の矢印ａに示すようにセルユニット３の側面とモジュールケース４の側壁との間の間隙を内圧開放部５に向けて流動する。 At this time, as described above, the gas released from the explosion-proof valve 2a of the cell 2 passes through the gap between the side surface of the cell unit 3 and the side wall of the module case 4 as shown by the arrow a in FIG. It flows toward.
　このガスの流動過程で隔壁６により流動が一旦遮られてケース４内上方へ指向する。そして、隔壁６の上端を乗り越えて内圧開放部５に向けてケース４内下方へ流動し、該内圧開放部５からケース４外へ放出される。 In the gas flow process, the flow is once blocked by the partition wall 6 and directed upward in the case 4. Then, it passes over the upper end of the partition wall 6 and flows downward in the case 4 toward the internal pressure release portion 5, and is discharged from the internal pressure release portion 5 to the outside of the case 4.
　このようにして、セル２の防爆弁２ａから放出された高温高圧のガスが内圧開放部５に向かう流動過程で、隔壁６の存在によって迂回が反復されることによって、ガスに含まれる発電要素の可燃性物質が内圧開放部５から直接外部へ流出するのが防止される。 In this manner, the high-temperature and high-pressure gas released from the explosion-proof valve 2a of the cell 2 is repeatedly detoured due to the presence of the partition wall 6 in the flow process toward the internal pressure release portion 5, thereby generating power generation elements included in the gas. The combustible substance is prevented from flowing out directly from the internal pressure release portion 5.
　また、ガス自体も隔壁６およびモジュールケース４の内面に衝突して迂回することから温度を下げる効果が得られる。 Also, since the gas itself collides with the inner surface of the partition wall 6 and the module case 4 and detours, the effect of lowering the temperature can be obtained.
　ここで、隔壁６は、上述のようにモジュールケース４に設けた内圧開放部５とセルユニット３の外周縁とを結ぶ直線Ｌを遮蔽可能な配置としてある。これにより、防爆弁２ａ以外でセル２のフィルムの貼り合わせ部がどの位置で開封して発生ガスが放出したとしても、必ず圧力開放部５の前には隔壁６が立ちはだかって、上述のガス流動の迂回作用が得られる。従って、可燃性物質の直接的な外部流出の防止効果と、ガスの温度低下作用と、が得られる。 Here, the partition wall 6 is arranged so as to shield the straight line L connecting the internal pressure release portion 5 provided in the module case 4 and the outer peripheral edge of the cell unit 3 as described above. As a result, regardless of the position where the bonded portion of the film of the cell 2 other than the explosion-proof valve 2a is opened and the generated gas is released, the partition wall 6 always stands in front of the pressure release portion 5, and the above gas flow The detouring effect is obtained. Accordingly, it is possible to obtain the effect of preventing direct inflow of the combustible substance and the gas temperature lowering effect.
　図５は本発明の第２実施形態を示すもので、本実施形態では、隔壁６を、内圧開放部５を設けたモジュールケース４の一方の端部壁と、セルユニット３の一方の端部と、の中間位置に配置してある。 FIG. 5 shows a second embodiment of the present invention. In this embodiment, the partition wall 6 includes one end wall of the module case 4 provided with the internal pressure release portion 5 and one end portion of the cell unit 3. It is arranged at an intermediate position.
　このように、隔壁６をセルユニット３の端部から離間させて内圧開放部５に近づけることにより、内圧開放部５とセルユニット３の外周縁とを結ぶ直線Ｌを遮蔽可能な隔壁６の幅寸法を、セルユニット３の幅寸法程度に短くすることが可能となり、隔壁６の小型，軽量化を図ることができる。 Thus, by separating the partition wall 6 from the end of the cell unit 3 and approaching the internal pressure release portion 5, the width of the partition wall 6 that can shield the straight line L connecting the internal pressure release portion 5 and the outer peripheral edge of the cell unit 3. The dimension can be shortened to about the width dimension of the cell unit 3, and the partition wall 6 can be reduced in size and weight.
　図６は本発明の第３実施形態を示すもので、第２実施形態と異なる点は、内圧開放部５を、モジュールケース４の端部壁の一方の隅部寄りに片寄った位置に設定すると共に、隔壁６を、この内圧開放部５に対応してモジュールケース４の幅方向の一方に片寄って配置したことにある。 FIG. 6 shows a third embodiment of the present invention. The difference from the second embodiment is that the internal pressure releasing portion 5 is set at a position offset toward one corner of the end wall of the module case 4. At the same time, the partition wall 6 is arranged so as to be offset to one side in the width direction of the module case 4 corresponding to the internal pressure release portion 5.
　このように、内圧開放部５と隔壁６とをモジュールケース４の幅方向の一方に偏在させることにより、上述の直線Ｌを遮蔽可能な隔壁６の幅方向寸法を可及的に短くすることができて、隔壁６をより一層小型，軽量化することができる。 In this way, by making the internal pressure release portion 5 and the partition wall 6 unevenly distributed on one side in the width direction of the module case 4, the width direction dimension of the partition wall 6 that can shield the straight line L can be shortened as much as possible. Thus, the partition wall 6 can be further reduced in size and weight.
　図７は隔壁６のいくつかの異なる例を示している。図７の（ａ）に示す隔壁６は、全体形状を蛇腹状の凹凸形状としてある。 FIG. 7 shows several different examples of the partition wall 6. The overall shape of the partition wall 6 shown in FIG. 7A is a bellows-like uneven shape.
　同図の（ｂ）に示す隔壁６は、周縁部に囲まれた中央部分をルーバー構造としている。 The partition 6 shown in (b) of the figure has a louver structure at the center surrounded by the peripheral edge.
　同図の（ｃ）に示す隔壁６は、周縁部に囲まれた中央部分をメッシュ構造にしたものである。（ｄ）に示す隔壁６は、周縁部に囲まれた中央部分を多孔構造としている。 The partition wall 6 shown in (c) of the figure has a mesh structure at the center surrounded by the peripheral edge. The partition wall 6 shown in (d) has a porous structure at the center surrounded by the peripheral edge.
　（ａ）に示した凹凸形状の隔壁６では、ガスの移動距離を長くし、かつ、ガスの接触面積を増やすことができるため、ガスの冷却効果を高めることができる。 In the uneven-shaped partition wall 6 shown in (a), the gas moving distance can be increased and the gas contact area can be increased, so that the gas cooling effect can be enhanced.
　また、（ｂ）～（ｄ）に示したルーバー構造，メッシュ構造，多孔構造の隔壁６では、何れもガスの接触面積を増やすことができるため、ガスの冷却効果を高めることができる。 In the louver structure, mesh structure, and porous structure 6 shown in (b) to (d), since the gas contact area can be increased, the gas cooling effect can be enhanced.
　図８は本発明の第４実施形態を示すもので、前記第１実施形態における隔壁６を構成するエンドプレート７の下端に、セルユニット３の長さ方向の中央に向かって延在する底壁部７ｂを設け、該底壁部７ｂをモジュールケース４の底壁に面接触させている。 FIG. 8 shows a fourth embodiment of the present invention. A bottom wall extending toward the center in the length direction of the cell unit 3 at the lower end of the end plate 7 constituting the partition wall 6 in the first embodiment. A portion 7 b is provided, and the bottom wall portion 7 b is in surface contact with the bottom wall of the module case 4.
　このように、隔壁６を構成するエンドプレート７とモジュールケース４の底壁との接触面積を増大することによって、矢印ｈで示すように隔壁６からモジュールケース４の底壁への伝熱，放熱作用が高められて、ガスの冷却効果を高めることができる。 Thus, by increasing the contact area between the end plate 7 constituting the partition wall 6 and the bottom wall of the module case 4, heat transfer and heat dissipation from the partition wall 6 to the bottom wall of the module case 4 as indicated by an arrow h. The effect is enhanced, and the gas cooling effect can be enhanced.
　図９は本発明の第５実施形態を示すもので、本実施形態にあっては、隔壁６を一体に設けたモジュールケース４の側壁を凹凸形状としてある。 FIG. 9 shows a fifth embodiment of the present invention. In this embodiment, the side wall of the module case 4 integrally provided with the partition wall 6 has an uneven shape.
　このように、隔壁６と熱的に接続しているモジュールケース４の側壁を凹凸形状とすることにより、矢印ｈで示すように該側壁の放熱作用が高められて隔壁６およびモジュールケース４の側壁に衝突するガスの冷却効果を高めることができる。 Thus, by making the side wall of the module case 4 thermally connected to the partition wall 6 into an uneven shape, the heat radiation action of the side wall is enhanced as shown by the arrow h, and the side wall of the partition wall 6 and the module case 4 is increased. The cooling effect of the gas that collides with the gas can be enhanced.
　図１０，図１１は本発明の第６実施形態を示しており、隔壁を複数枚用いて、これをセルユニット３と内圧開放部５との間で、ガスの流出経路が蛇行するように多段配置したものである。 FIGS. 10 and 11 show a sixth embodiment of the present invention, in which a plurality of partition walls are used, and this is multistage so that the gas outflow path snakes between the cell unit 3 and the internal pressure release portion 5. It is arranged.
　図示する例では、前記第１実施形態における内圧開放部５を、モジュールケース４の一方の端部壁の上部中央に設定してある。そして、該内圧開放部５とこれに対向するエンドプレート７との中間位置に、エンドプレート７で構成された隔壁６とは別の第２の隔壁６Ａが配置されている。この第２の隔壁６Ａは、モジュールケース４の上壁に取り付けられ、下方へ向かって延びている。 In the illustrated example, the internal pressure releasing portion 5 in the first embodiment is set at the upper center of one end wall of the module case 4. Then, a second partition 6A different from the partition 6 constituted by the end plate 7 is disposed at an intermediate position between the internal pressure release portion 5 and the end plate 7 facing the internal pressure release portion 5. The second partition 6A is attached to the upper wall of the module case 4 and extends downward.
　これにより、蛇行したガス流出経路が構成される。つまり、セル２の防爆弁２ａから放出されたガスが、セルユニット３の側面とモジュールケース４の側壁との間の間隙を内圧開放部５に向けて流動する過程で、隔壁６により流動が一旦遮られてケース４内上方へ指向したガスが、隔壁６を乗り越えてケース４内下方へ指向し、第２の隔壁６Ａの下端をくぐり抜けて内圧開放部５へ向けて上方へ指向して流れる。 This forms a meandering gas outflow path. That is, in the process in which the gas released from the explosion-proof valve 2 a of the cell 2 flows toward the internal pressure release portion 5 through the gap between the side surface of the cell unit 3 and the side wall of the module case 4, the flow is once caused by the partition wall 6. The gas that is blocked and directed upward in the case 4 gets over the partition wall 6 and flows downward in the case 4, passes through the lower end of the second partition wall 6 </ b> A, and flows upward toward the internal pressure release portion 5.
　この第６実施形態の構成によれば、ガスの移動距離を長くでき、また、ガスの接触面積を増大できるので、ガス中の可燃性物質の直接的な外部流出の防止効果を高められると共に、ガスの温度低下作用を向上することができる。 According to the configuration of the sixth embodiment, since the gas moving distance can be increased and the gas contact area can be increased, the effect of preventing direct flammable substances from flowing directly outside the gas can be enhanced, It is possible to improve the gas temperature lowering effect.
　なお、前述の各実施形態ではセル２に防爆弁２ａを設けて、ガス発生時のセル開封位置を特定するものを開示したが、これに限定されるものではない。各セル２が防爆弁２ａを具備しない電池モジュールにおいても、本発明は適用可能である。 In each of the above-described embodiments, the explosion-proof valve 2a is provided in the cell 2 and the cell opening position at the time of gas generation is specified. However, the present invention is not limited to this. The present invention can also be applied to a battery module in which each cell 2 does not include the explosion-proof valve 2a.
　また、前述の各実施形態では、隔壁６がモジュールケース４に設けられているが、本発明はこれに限定されず、例えば、セル２ないしセルユニット３が隔壁６を支持する構成であってもよい。 Further, in each of the above-described embodiments, the partition wall 6 is provided in the module case 4, but the present invention is not limited to this, and for example, the cell 2 or the cell unit 3 may be configured to support the partition wall 6. Good.
　図１２～図１４は、セルユニット３が隔壁６を支持している本発明の第７実施形態を示している。この実施形態では、前述した各実施形態とは異なり、内圧開放部５がモジュールケース４の一方の側壁に設けられている。詳しくは、各セル２の防爆弁２ａと同じ側となるモジュールケース４の側壁の中央に内圧開放部５が配置されている。複数のセル２が積層されてなるセルユニット３は、両端に一対のエンドプレート７を有し、該エンドプレート７を介してモジュールケース４内に固定されている。隔壁６は、矩形の金属板からなり、セルユニット３の一方の側面、特に内圧開放部５に対向する側の側面に配置されている。この隔壁６は、本実施形態では、セルユニット３の側面全体を覆う大きさを有し、両端部がエンドプレート７に取り付けられている。 FIGS. 12 to 14 show a seventh embodiment of the present invention in which the cell unit 3 supports the partition wall 6. In this embodiment, unlike each embodiment described above, the internal pressure releasing portion 5 is provided on one side wall of the module case 4. Specifically, the internal pressure release portion 5 is arranged at the center of the side wall of the module case 4 on the same side as the explosion-proof valve 2 a of each cell 2. A cell unit 3 formed by laminating a plurality of cells 2 has a pair of end plates 7 at both ends, and is fixed in the module case 4 via the end plates 7. The partition wall 6 is made of a rectangular metal plate, and is disposed on one side surface of the cell unit 3, particularly on the side surface facing the internal pressure release portion 5. In this embodiment, the partition wall 6 has a size that covers the entire side surface of the cell unit 3, and both end portions are attached to the end plate 7.
　また、セルユニット３の各セル２の端子を互いに接続する端子接続基板を利用して、上記隔壁６を構成することもできる。この場合、隔壁６となる端子接続基板は、金属製のバスバーを含む合成樹脂製の基板からなり、図１２～図１４と同様に、セルユニット３の一方の側面に取り付けられる。 Further, the partition wall 6 can also be configured by using a terminal connection substrate for connecting the terminals of the cells 2 of the cell unit 3 to each other. In this case, the terminal connection board to be the partition wall 6 is made of a synthetic resin board including a metal bus bar, and is attached to one side surface of the cell unit 3 as in FIGS.

Claims (8)

  1. 　複数のセルを積層したセルユニットと、
    　前記セルユニットを収納したモジュールケースと、
    　前記モジュールケースに貫通配置されて、内部に溜まったガスを外部に放出する内圧開放部と、
    　前記セルユニットと前記内圧開放部との間に配置した隔壁と、
    　を備え、
    　前記隔壁は、前記内圧開放部と前記セルユニットの外周縁とを結ぶ直線を遮蔽するように配置されている、電池モジュールのガス排出構造。     A cell unit in which a plurality of cells are stacked;
    A module case containing the cell unit;
    An internal pressure release portion that is disposed through the module case and discharges gas accumulated inside to the outside;
    A partition wall disposed between the cell unit and the internal pressure release portion;
    With
    The battery partition gas discharge structure for a battery module, wherein the partition wall is arranged so as to shield a straight line connecting the internal pressure release portion and the outer peripheral edge of the cell unit.
  2. 　前記隔壁は、壁面を凹凸形状としてある、請求項１に記載の電池モジュールのガス排出構造。 The gas discharge structure of a battery module according to claim 1, wherein the partition wall has a concave-convex shape.
  3. 　前記隔壁は、ルーバー構造または多孔構造あるいはメッシュ構造としてある、請求項１に記載の電池モジュールのガス排出構造。 The battery module gas discharge structure according to claim 1, wherein the partition wall has a louver structure, a porous structure, or a mesh structure.
  4. 　複数の前記隔壁を備え、
    　前記セルユニットと前記内圧開放部との間で、ガスの流出経路が蛇行するように、複数の前記隔壁が多段に配置されている、請求項１～３の何れか１つに記載の電池モジュールのガス排出構造。     A plurality of the partition walls,
    The battery module according to any one of claims 1 to 3, wherein a plurality of the partition walls are arranged in multiple stages so that a gas outflow path meanders between the cell unit and the internal pressure release portion. Gas exhaust structure.
  5. 　前記モジュールケースは、その壁面を凹凸形状としてある、請求項１～４の何れか１つに記載の電池モジュールのガス排出構造。 The battery module gas discharge structure according to any one of claims 1 to 4, wherein the module case has an uneven wall surface.
  6. 　前記セルユニットのセル積層方向の一端に対向する前記モジュールケースの一方の端部壁に前記内圧開放部が配置されており、
    　前記セルユニットの一端に設けられたエンドプレートが前記隔壁を構成している、請求項１に記載の電池モジュールのガス排出構造。     The internal pressure release portion is disposed on one end wall of the module case facing one end of the cell unit in the cell stacking direction,
    The gas discharge structure of the battery module according to claim 1, wherein an end plate provided at one end of the cell unit constitutes the partition wall.
  7. 　前記隔壁は、前記モジュールケースに設けられている、請求項１に記載の電池モジュールのガス排出構造。 The battery module gas discharge structure according to claim 1, wherein the partition wall is provided in the module case.
  8. 　前記隔壁は、前記セルユニットに支持されている、請求項１に記載の電池モジュールのガス排出構造。 The battery module gas discharge structure according to claim 1, wherein the partition wall is supported by the cell unit.
PCT/JP2013/077284 2012-10-25 2013-10-08 Gas discharge structure for battery module WO2014065110A1 (en)

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