WO2014141779A1 - 電池モジュール及びその製造方法 - Google Patents
電池モジュール及びその製造方法 Download PDFInfo
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- WO2014141779A1 WO2014141779A1 PCT/JP2014/052661 JP2014052661W WO2014141779A1 WO 2014141779 A1 WO2014141779 A1 WO 2014141779A1 JP 2014052661 W JP2014052661 W JP 2014052661W WO 2014141779 A1 WO2014141779 A1 WO 2014141779A1
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- WIPO (PCT)
- Prior art keywords
- battery
- battery cell
- module
- case
- module case
- Prior art date
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- 238000004519 manufacturing process Methods 0.000 title claims description 10
- 239000003792 electrolyte Substances 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 3
- 239000012530 fluid Substances 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000005192 partition Methods 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/70—Carriers or collectors characterised by shape or form
-
- 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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/105—Pouches or flexible bags
-
- 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
- H01M50/211—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for pouch cells
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Definitions
- the present invention relates to a battery module in which battery cells are housed in a module case and a method for manufacturing the same.
- a battery cell in which a positive electrode and a negative electrode are stacked with a separator interposed therebetween is known.
- a battery module including this type of battery cell a battery module in which the battery cell is housed in a module case for protecting the battery cell is known.
- the battery module when an internal short circuit occurs in the battery cell, gas is generated in the battery cell, and the internal pressure of the battery cell increases.
- the battery cell expands in the thickness direction, which is the direction in which the positive electrode and the negative electrode are stacked via the separator.
- the battery cell accommodated in the module case gradually increases the internal current of the battery cell, and the battery cell generates heat as the internal current increases. Will be destroyed.
- Patent Document 1 discloses a configuration in which a deformable member for allowing expansion of the battery cell is arranged in a module case in which a plurality of battery cells are accommodated. It is disclosed.
- the module case included in the battery module described in Patent Document 1 houses a deformable member together with a plurality of battery cells.
- the module case is allowed to expand while holding down the expanding battery cell by a deforming member that is elastically deformed when pressed below a predetermined pressure and that does not deform further when the predetermined pressure is exceeded. It is configured.
- Patent Document 1 has a problem that the structure for arranging the deformable member in the module case is complicated and the manufacturing cost increases.
- an object of the present invention is to provide a battery module and a method for manufacturing the same that can solve the above-described technical problems.
- An example of an object of the present invention is to provide a battery module and a method of manufacturing the battery module that can be deformed without hindering expansion of the battery cell when the internal short circuit occurs in the battery cell with a simple configuration and improve safety. It is to provide.
- a battery module includes a battery cell and a module case that houses the battery cell inside.
- a battery element in which a positive electrode and a negative electrode are stacked or wound via a separator, and an electrolyte are accommodated in an exterior body and formed in a flat shape.
- the module case has a deformed portion that bulges toward the main surface side of the battery cell at a position facing the main surface of the flat battery cell, and the deformed portion of the module case expands when the battery cell expands. It is formed so that it can bulge outward.
- the battery module manufacturing method includes a battery cell and a module case that houses the battery cell therein, and the battery cell is laminated or stacked with a positive electrode and a negative electrode interposed via a separator.
- a battery module manufacturing method in which a rotated battery element and an electrolyte are accommodated in an exterior body and formed in a flat shape, wherein the battery is disposed at a position of the module case facing the main surface of the flat battery cell.
- the deformed portion of the module case is deformed without disturbing the expansion of the battery cell, thereby preventing an increase in the internal current of the battery cell with a simple configuration. , Can improve safety.
- FIG. 1A shows a perspective view of the battery module of the first embodiment.
- FIG. 1B shows a cross-sectional view of the battery module of the first embodiment.
- FIG. 1C shows a cross-sectional view of the battery module of the first embodiment in a deformed state.
- the schematic diagram of the battery cell in the battery module of 1st Embodiment is shown to FIG. 2A and 2B.
- FIG. 3A to FIG. 3C are schematic views of the battery cell exterior body in the battery module of the first embodiment.
- the battery module 1 of the first embodiment includes a plurality of battery cells 5 and a module case 6 that houses the plurality of battery cells 5 therein.
- a module case 6 that accommodates two battery cells 5 is shown, but an assembled battery may be accommodated instead of the battery cell 5, and for convenience of explanation, only one battery cell or an assembled battery is included in the module case. A description of the housed configuration is omitted.
- the battery cell 5 includes a plurality of positive electrode current collectors 7 as positive electrode electrodes, a plurality of negative electrode current collectors 8 as negative electrode electrodes, and a separator disposed between the positive electrode current collector 7 and the negative electrode current collector 8 9, and a laminated current collector 10 as a battery element in which a positive electrode current collector 7 and a negative electrode current collector 8 are laminated via a separator 9.
- the battery cell 5 is formed in a flat shape by accommodating a laminated current collector 10 and an electrolytic solution (not shown) as an electrolyte in an outer package 11.
- a battery element for convenience, it is referred to as a battery element.
- the positive electrode current collector 7 is formed by applying a positive electrode mixture on both surfaces of a strip-shaped current collector made of aluminum.
- the negative electrode current collector 8 is formed by applying a negative electrode mixture on both surfaces of a copper strip-shaped current collector.
- the positive electrode current collector tab 12 is integrally formed with the positive electrode current collector 7, and the negative electrode current collector tab 13 is integrally formed with the negative electrode current collector 8.
- One end of the positive electrode current collecting tab 12 is electrically connected to the positive electrode current collector 7, and the other end is drawn out of the exterior body 11.
- one end of the negative electrode current collecting tab 13 is electrically connected to the negative electrode current collector 8, and the other end is drawn out of the exterior body 11.
- the current collector supplied from the unwinding side roll is wound on the winding side roll while winding the belt-shaped current collector supplied from the unwinding side roll.
- the positive electrode mixture is applied to At this time, with respect to the longitudinal direction of the strip-shaped current collector, application portions to which the positive electrode mixture is applied and non-application portions to which the positive electrode mixture is not applied are alternately formed. And a part of non-application part is formed as a positive electrode current collection tab by punching a part of non-application part by press work with an application part.
- the step of forming the negative electrode current collector is the same as the step of forming the positive electrode current collector, and thus the description thereof is omitted.
- the positive electrode current collecting tab 12 and the negative electrode current collecting tab 13 are not limited to the configuration of being pulled out from one end side of the outer package 11, and the positive electrode current collecting tab is drawn out from one of opposite ends of the outer package 11. Of course, the negative electrode current collecting tab may be drawn from the other side.
- the laminated current collector 10 has a side surface from which the positive electrode current collector tab 12 and the negative electrode current collector tab 13 are not drawn, and the electrode current collectors 7 and 8 and the separator 9 are separated by a fixing tape 14 as shown in FIG. 2A. Bundled and fixed so that the relative positions of the electrode current collectors 7 and 8 and the separator 9 are prevented from shifting.
- each current collection tab 12 and 13 may be connected with each terminal 17 and 18 via the supplementary member which has electroconductivity.
- the separator 9 is made of a polyolefin resin material.
- the separator 9 may be formed in a bag shape into which a portion of the positive electrode current collector 7 excluding the positive electrode current collecting tab 12 is inserted.
- the bag-shaped separator 9 is formed by stacking two quadrangular separators 9 and heat-sealing the three sides of the outer periphery of the two separators 9.
- the external dimensions of the main surface of the negative electrode current collector 8 are formed to be equal to the external dimensions of the main surface of the separator 9.
- the exterior body 11 is preferably formed of a flexible material such as an easily deformable aluminum sheet so as to allow deformation of the laminated current collector 10.
- the exterior body 11 is configured by combining a set of exterior members 11 a so as to constitute an accommodating portion 19 in which the laminated current collector 10 is accommodated.
- the exterior body 11 may be configured to fold back one end of the exterior member 11 b having the storage portion 19 to close the opening of the storage portion 19.
- the outer package 11 may of course be formed as a so-called rectangular battery can 11 c that is formed in a box shape having the accommodating portion 19.
- FIG. 4 shows a plan view of the case portion 21 of the module case 6 in the first embodiment.
- FIG. 5 the top view of the cover part 22 of the module case 6 in 1st Embodiment is shown.
- the module case 6 that is a main part of the present embodiment is formed of a resin material, and covers a case portion 21 that houses the battery cell 5 and one main surface of the battery cell 5. Part 22.
- the case portion 21 is formed in a box shape having an opening, and a cover portion 22 is attached to the opening and closed.
- a cover portion 22 is attached to the opening and closed.
- two battery cells 5 are arranged side by side with a partition wall 26 formed on the bottom surface interposed therebetween.
- the case portion 21 is formed with a receiving portion 28 for a fastening screw 27 for fixing the battery cell 5.
- a bus bar 25 for electrically connecting the battery cells 5 is provided on the bottom surface of the case portion 21 as shown in FIG. Further, the case portion 21 is provided with a wiring (not shown) connected to each terminal of the battery cell 5 and drawn to the outside of the module case 6 and a connector 29.
- the cover portion 22 is provided with a deformed portion 23 that bulges on the main surface of the battery cell 5 at a position facing the main surface of the battery cell 5. That is, the deforming portion 23 is formed at a position corresponding to a portion where the expansion generated in the flat battery cell 5 is relatively large.
- the deformed portion 23 is formed so as to be able to bulge toward the outside of the module case 6 when the battery cell 5 is expanded.
- the deformed portion 23 is formed in a rectangular concave shape corresponding to the outer shape of the battery cell 5, and the outer dimension of the deformed portion 23 is formed approximately equal to the outer size of the battery cell 5.
- a predetermined gap is provided between the inner surface of the deformable portion 23 and the main surface of the battery cell 5, but the inner surface of the deformable portion 23 is the main surface of the battery cell 5 as necessary. You may contact
- the battery cell 5 is more stably supported by the module case 6 by bringing the inner surface of the deformed portion 23 of the cover portion 22 into contact with the exterior body 11 of the battery cell 5.
- FIG. 6 shows a plan view of another configuration example of the case portion of the module case 6.
- FIG. 7 the top view of the other structural example of the cover part of the module case 6 is shown.
- the bus bar is connected to both ends of the battery cell 5 in the case portion 21 of the module case 6.
- a space for arranging 25 is provided.
- the cover portion 22 of the module case 6 is formed with the deformed portion 23 corresponding to the position of the main surface of the battery cell 5 arranged in the case portion 21 as shown in FIG. ing.
- the battery cell 5 is fixed on the bottom surface of the case portion 21, but is not limited to this configuration, and the battery cell 5 has a fastening screw on the cover portion 22 side as necessary. It may be fixed via.
- a plurality of battery cells 5 may be stacked and gathered to form an assembled battery, and the assembled battery may be accommodated in the module case 6.
- the stacked battery cells 5 are bundled and fixed by a fixing tape.
- the exterior body 11 swells toward the outside of the battery cell 5 due to the gas generated in the exterior body 11 as shown in FIG. 1C.
- the battery cell 5 pushes up the deformation part 23, and the deformation part 23 bulges toward the outside of the module case 6.
- the deformation portion 23 is deformed in accordance with the expansion of the battery cell 5, so that the module case 6 does not hinder the expansion of the battery cell 5, and the positive electrode current collector 7 and the negative electrode current collector 8 are deformed. Increased resistance between. For this reason, when an internal short circuit arises in the battery cell 5, it can suppress that an internal current raises.
- the internal deformation of the battery cell 5 occurs when the deformation portion 23 deforms toward the outside of the module case 6.
- the resistance between the electrodes increases, and an increase in internal current can be prevented.
- the safety of the battery module 1 can be enhanced with a simple configuration.
- each battery cell 5 can be allowed to expand by a simple configuration in which the deformable portion 23 is formed in the module case 6 as compared with the configuration described in Patent Document 1, and the battery module. It can suppress that the manufacturing cost of 1 increases.
- the present embodiment has a configuration in which a deformable member for allowing the battery cell to bulge out as in Patent Document 1 described above is provided inside the module case, and a space for allowing the battery cell to expand. Compared with the configuration secured inside the module case, the entire module case 6 can be made thinner when the battery cell 5 is in a normal state.
- 23 can be easily formed.
- FIG. 8A shows a perspective view of the battery module of the second embodiment.
- FIG. 8C shows a cross-sectional view of the battery module of the second embodiment. Since the battery cell in 2nd Embodiment is the same as the battery cell 5 in 1st Embodiment, description about the battery cell 5 is abbreviate
- constituent members similar to those of the above-described embodiment will be briefly described.
- the battery module 2 of the second embodiment is different from the first embodiment in that the battery cells 5 are respectively disposed on both sides of the module case and the deformed portions are provided on both sides of the module case. Yes.
- the module case 26 included in the battery module 2 of the second embodiment includes a case portion 31 for housing the battery cells 5 and a board portion to which the plurality of battery cells 5 are fixed. 32 and a set of cover portions 33 that cover the main surface of the battery cell 5 fixed to the board portion 32.
- the case portion 31 is formed in a rectangular tube shape that opens on both sides, and the board portion 32 is fixed inside.
- the board portion 32 is formed in a flat plate shape, and a plurality of battery cells 5 are arranged on the front surface and the back surface.
- a plurality of battery cells 5 are arranged on the front surface and the back surface.
- two battery cells 5 are arranged side by side with a partition wall 36 in between.
- two battery cells 5 are arranged side by side with a partition wall 36 in between on the back surface of the board portion 32.
- the outer peripheral part of the board part 32 is being fixed to the inner surface of the case part 31, and the receiving part 38 of the fastening screw (not shown) for fixing the battery cell 5 is formed.
- a deforming portion 34 is formed at a position of the cover portion 33 facing each main surface of the two battery cells 5 fixed to the board portion 32.
- the deformed part of the module case has a stepped shape in which a plurality of steps are formed concentrically, and a step in the center of the main surface of the battery cell where the amount of displacement tends to be relatively large.
- the step may be formed so that the level difference gradually decreases toward the surface, or a bellows shape including a fold-like folded portion, and the same effect as in the present embodiment can be obtained.
- cover portion may be formed so that the thickness of the deformed portion is thinner than the portion around the deformed portion in order to easily deform only the deformed portion.
- deforming portion may be formed such that the bent portion that is bent when deforming is formed thinner than other portions of the deforming portion, or the thickness of the deforming portion changes stepwise.
- the shape and thickness of the deformed portion that bulges to the main surface side of the battery cell is appropriately set according to the shape of the battery cell accommodated in the module case, the region where expansion occurs, and the amount of deformation of the battery cell. It may be set, and a groove for urging deformation may be formed on the inner surface of the deformed portion.
- the cover part of the module case may be arranged such that a plurality of deformed parts are dispersed in a predetermined region corresponding to the main surface of one battery cell.
- the deformable portion is integrally formed on the cover portion.
- the deformable portion may be formed of a material having lower rigidity than other portions of the cover portion as necessary.
- the deforming portion may be configured to be deformed to the outside of the module case and to be broken from the cover portion when a predetermined pressure or more is applied.
- the battery cell having a stacked structure is used.
- the structure of the battery cell is not limited, and the positive electrode current collector and the negative electrode current collector are wound through a separator.
- a battery cell having a wound structure may be used.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Battery Mounting, Suspending (AREA)
- Secondary Cells (AREA)
Abstract
Description
図1Aに、第1の実施形態の電池モジュールの斜視図を示す。図1Bに、第1の実施形態の電池モジュールの断面図を示す。図1Cに、第1の実施形態の電池モジュールが変形した状態の断面図を示す。図2A及び図2Bに、第1の実施形態の電池モジュールにおける電池セルの模式図を示す。図3A~図3Cに、第1の実施形態の電池モジュールにおける電池セルの外装体の模式図を示す。
図8Aに、第2の実施形態の電池モジュールの斜視図を示す。図8Cに、第2の実施形態の電池モジュールの断面図を示す。第2の実施形態における電池セルは、第1の実施形態における電池セル5と同一であるため、電池セル5についての説明を省略する。また、第2の実施形態において、上述した実施形態と同様な構成部材については簡単に説明する。
5 電池セル
6 モジュールケース
7 正極集電体
8 負極集電体
9 セパレータ
10 積層集電体
11 外装体
23 変形部
Claims (6)
- 電池セルと、該電池セルを内部に収容するモジュールケースと、を備える電池モジュールであって、
前記電池セルは、正極電極と負極電極とがセパレータとを介して積層または捲回された電池要素と、電解質とが外装体に収容されて扁平状に形成され、
前記モジュールケースは、前記扁平状の電池セルの主面に対向する位置に、前記電池セルの前記主面側に膨出した変形部を有し、
前記変形部は、前記電池セルが膨張したときに前記モジュールケースの外側に向かって膨出可能に形成されている電池モジュール。 - 前記モジュールケースには、複数の前記電池セルが収容されている、請求項1に記載の電池モジュール。
- 前記複数の前記電池セルは、前記モジュールケース内に、同一面上に並べて配置されている、請求項2に記載の電池モジュール。
- 前記モジュールケースは、前記電池セルを収容するケース部と、該ケース部に取り付けられて前記電池セルの主面を覆うカバー部と、を有し、
前記電池セルは、前記カバー部または前記ケース部の少なくとも一方に固定され、
前記変形部は、前記カバー部に形成されている、請求項1ないし3のいずれか1項に記載の電池モジュール。 - 前記モジュールケースは、前記電池セルを収容するケース部と、該ケース部内に配されて前記電池セルが固定されるボード部と、前記ケース部に取り付けられて前記ボード部の表裏をそれぞれ覆って配置される一組のカバー部と、を有し、
前記電池セルは、前記ボード部の表裏にそれぞれ配置され、
前記変形部は、前記一組のカバー部にそれぞれ形成されている、請求項1ないし3のいずれか1項に記載の電池モジュール。 - 電池セルと、該電池セルを内部に収容するモジュールケースと、を備え、前記電池セルが、正極電極と負極電極とがセパレータとを介して積層または捲回された電池要素と、電解質とが外装体に収容されて扁平状に形成された電池モジュールの製造方法であって、
前記モジュールケースの、前記扁平状の電池セルの主面に対向する位置に、前記電池セルが膨張したときに前記モジュールケースの外側に向かって膨出可能な変形部を、前記電池セルの前記主面側に膨出させて形成する工程を有する、電池モジュールの製造方法。
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JP2015505321A JP6292677B2 (ja) | 2013-03-15 | 2014-02-05 | 電池モジュール及びその製造方法 |
US14/775,783 US10103360B2 (en) | 2013-03-15 | 2014-02-05 | Battery module and method of manufacturing same |
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JP2013053388 | 2013-03-15 | ||
JP2013-053388 | 2013-03-15 |
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JP2017004655A (ja) * | 2015-06-05 | 2017-01-05 | 古河電池株式会社 | ラミネートパック型電池ユニット、及び組電池モジュール |
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Also Published As
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JPWO2014141779A1 (ja) | 2017-02-16 |
JP6292677B2 (ja) | 2018-03-14 |
US20160028050A1 (en) | 2016-01-28 |
US10103360B2 (en) | 2018-10-16 |
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