JP2014067619A - Power storage device and secondary battery - Google Patents
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- JP2014067619A JP2014067619A JP2012212718A JP2012212718A JP2014067619A JP 2014067619 A JP2014067619 A JP 2014067619A JP 2012212718 A JP2012212718 A JP 2012212718A JP 2012212718 A JP2012212718 A JP 2012212718A JP 2014067619 A JP2014067619 A JP 2014067619A
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- 238000003860 storage Methods 0.000 title claims description 16
- 230000004927 fusion Effects 0.000 claims description 16
- 238000010030 laminating Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 239000011149 active material Substances 0.000 description 5
- 238000005452 bending Methods 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 239000011888 foil Substances 0.000 description 3
- 229920005992 thermoplastic resin Polymers 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000008151 electrolyte solution Substances 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- -1 polypropylene Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 239000012777 electrically insulating material Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- 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
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Electric Double-Layer Capacitors Or The Like (AREA)
- Cell Separators (AREA)
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Abstract
Description
本発明は、蓄電装置及び二次電池に係り、詳しくは正極及び負極がセパレータを間に介在する状態で積層された積層型の電極組立体を有する蓄電装置及び二次電池に関する。 The present invention relates to a power storage device and a secondary battery, and more particularly to a power storage device and a secondary battery having a stacked electrode assembly in which a positive electrode and a negative electrode are stacked with a separator interposed therebetween.
二次電池やキャパシタのような蓄電装置は再充電が可能であり、繰り返し使用することができるため電源として広く利用されている。二次電池として、正極用のシート状の電極及び負極用のシート状の電極が、セパレータを間に介在する状態で積層された積層型の電極組立体を備えたものがある。積層型の電極組立体として、つづら折り状のセパレータを用いたものがある（例えば、特許文献１参照）。 Power storage devices such as secondary batteries and capacitors are widely used as power sources because they can be recharged and can be used repeatedly. Some secondary batteries include a stacked electrode assembly in which a positive electrode sheet electrode and a negative electrode sheet electrode are stacked with a separator interposed therebetween. As a stacked electrode assembly, there is one using a zigzag separator (see, for example, Patent Document 1).
特許文献１では、図５に示すように、電極組立体５０を構成するセパレータ５１は、ジグザグ状（つづら折り状）に折り返され、セパレータ５１には、一方側に開放された正極収容部と、他方側に開放された負極用収容部とが交互に形成されている。それぞれの正極収容部にはタブ５２が正極収容部から突出する状態で１枚ずつ正極が収容され、負極収容部にはタブ５３が負極収容部から突出する状態で１枚ずつ負極が収容されている。そして、図５に一点鎖線αで示すように、ジグザグ状に折り返されたセパレータ５１の幅方向の両端部５１ａは積層方向に閉じられている。セパレータ５１を閉じる手段として、テープ止めや接着剤による接着、あるいはセパレータ５１の材料に熱可塑性樹脂を含む場合は熱融着が挙げられている。また、図５に二点線βで示すように、負極収容部の開口側の折り返し部を閉じることにより、それぞれの負極収容部を密閉しても良いことも開示されている。 In Patent Document 1, as shown in FIG. 5, the separator 51 constituting the electrode assembly 50 is folded back in a zigzag shape (a zigzag folded shape), and the separator 51 includes a positive electrode housing portion opened on one side, The negative electrode accommodating portions opened to the side are alternately formed. Each of the positive electrode accommodating portions accommodates one positive electrode in a state where the tab 52 protrudes from the positive electrode accommodating portion, and each of the negative electrode accommodating portions accommodates one negative electrode in a state where the tab 53 protrudes from the negative electrode accommodating portion. Yes. As shown by a one-dot chain line α in FIG. 5, both end portions 51a in the width direction of the separator 51 folded back in a zigzag shape are closed in the stacking direction. Examples of means for closing the separator 51 include adhesion with a tape or an adhesive, or heat fusion when the material of the separator 51 includes a thermoplastic resin. Further, as indicated by a two-dot line β in FIG. 5, it is also disclosed that each negative electrode housing portion may be sealed by closing the folded portion on the opening side of the negative electrode housing portion.
つづら折り状のセパレータ５１を正極のタブ５２あるいは負極のタブ５３が突出している辺において、テープ止めや接着剤あるいは熱融着により接合する場合は、セパレータ同士を接合するのではなく、セパレータ５１の一部を金属製のタブ５２，５３と接合する必要があり、セパレータ５１同士を接合する場合に比べて接合し難い。 When the zigzag folded separator 51 is joined to the side where the positive electrode tab 52 or the negative electrode tab 53 protrudes by tape fastening, an adhesive, or heat fusion, the separators 51 are not joined to each other. It is necessary to join the portion to the metal tabs 52 and 53, and it is difficult to join compared to the case where the separators 51 are joined.
本発明は、前記の問題に鑑みてなされたものであって、その目的は、つづら折り状に折り畳まれたセパレータを介して正極及び負極が枚葉電極として交互に配置された積層型の電極組立体を製造する際に、正極、セパレータ及び負極を、位置ずれを抑制する状態で容易に接合することができる蓄電装置及び二次電池を提供することにある。 The present invention has been made in view of the above problems, and an object of the present invention is to provide a stacked electrode assembly in which positive and negative electrodes are alternately arranged as single-wafer electrodes via a separator folded in a zigzag manner. It is an object of the present invention to provide a power storage device and a secondary battery in which a positive electrode, a separator, and a negative electrode can be easily joined in a state of suppressing displacement.
前記の目的を達成するため、請求項１に記載の発明は、正極及び負極がセパレータを間に介在する状態で積層された積層型の電極組立体を有する蓄電装置であって、前記セパレータは、帯状のものが折り曲げ部と平面部とが交互に繰り返すつづら折り状に折り畳まれ、前記正極及び前記負極は、それぞれ矩形をなすとともに、１辺にタブを有し、前記タブが前記セパレータの前記平面部における前記折り曲げ部と直交する辺側に配置された状態で前記セパレータの平面部の間に挟まれて積層方向に交互に配置され、前記セパレータは、前記折り曲げ部が形成された２辺に設けられた融着部で前記セパレータ同士が積層方向に接合されている。 In order to achieve the above object, the invention described in claim 1 is a power storage device including a stacked electrode assembly in which a positive electrode and a negative electrode are stacked with a separator interposed therebetween, and the separator includes: The belt-shaped member is folded in a zigzag manner in which a bent portion and a flat portion are alternately repeated, each of the positive electrode and the negative electrode is rectangular, and has a tab on one side, and the tab is the flat portion of the separator. In the state of being disposed on the side orthogonal to the bent portion, the separator is alternately disposed in the stacking direction between the plane portions of the separator, and the separator is provided on two sides where the bent portion is formed. The separators are bonded together in the stacking direction at the fused portion.
この発明では、折り曲げ部と平面部とが交互に繰り返すつづら折り状に折り畳まれた帯状のセパレータは、折り曲げ部が形成された２辺に設けられた融着部でセパレータ同士が積層方向に接合されている。そのため、矩形をなすとともに、１辺にタブを有する枚葉電極からなる正極及び負極を平面部の間に挟んだ状態で、セパレータの対向する面、即ち平面部が接合される場合、タブが接合の妨げにならない。したがって、つづら折り状に折り畳まれたセパレータを介して正極及び負極が枚葉電極として交互に配置された積層型の電極組立体を製造する際に、正極、セパレータ及び負極を、位置ずれを抑制する状態で容易に接合することができる。 In this invention, the band-like separator folded in a zigzag manner in which the bent portion and the flat portion are alternately repeated is joined to each other in the laminating direction at the fusion portion provided on the two sides where the bent portion is formed. Yes. Therefore, when the opposing surfaces of the separator, i.e., the planar portion, are joined with a positive electrode and a negative electrode made of a single-wafer electrode having a tab on one side sandwiched between the planar portions, the tab is joined. Will not hinder. Therefore, when manufacturing a stacked electrode assembly in which the positive electrode and the negative electrode are alternately arranged as a single-wafer electrode via a separator folded in a zigzag shape, the positive electrode, the separator, and the negative electrode are prevented from being displaced. Can be easily joined.
請求項２に記載の発明は、請求項１に記載の発明において、前記融着部は、前記折り曲げ部に沿って連続する１本の線状に形成されている。融着部は、折り曲げ部に沿って間欠的に形成されてもよいが、連続する１本の線状に形成されている方が、正極及び負極を所定位置に保持し易く、熱融着を行うときにも連続的に行う方が、作業が簡単になる。 According to a second aspect of the present invention, in the first aspect of the present invention, the fused portion is formed in a single linear shape that continues along the bent portion. The fused part may be formed intermittently along the bent part, but the one formed in a continuous line shape makes it easier to hold the positive electrode and the negative electrode in place, and heat fusion is performed. It is easier to work continuously when doing it.
請求項３に記載の発明は、請求項１又は請求項２に記載の蓄電装置の構成を備えた二次電池である。したがって、この発明の二次電池は請求項１又は請求項２に記載の発明と同様の効果を有する。 A third aspect of the present invention is a secondary battery having the configuration of the power storage device according to the first or second aspect. Therefore, the secondary battery of the present invention has the same effect as that of the first or second aspect of the invention.
本発明によれば、つづら折り状に折り畳まれたセパレータを介して正極及び負極が枚葉電極として交互に配置された積層型の電極組立体を製造する際に、正極、セパレータ及び負極を、位置ずれを抑制する状態で容易に接合することができる。 According to the present invention, when manufacturing a stacked electrode assembly in which the positive electrode and the negative electrode are alternately arranged as a single-wafer electrode via the separator folded in a zigzag shape, the positive electrode, the separator, and the negative electrode are displaced. Can be easily joined in a state of suppressing the above.
以下、本発明を具体化した一実施形態を図１〜図３にしたがって説明する。
図１（ａ）に示すように、蓄電装置としての二次電池１０は、ケース１１内に、積層型の電極組立体１２及び電解液１３が収容されている。図１（ｂ）に示すように、電極組立体１２は、正極１４及び負極１５がセパレータ１６を間に介在する状態で積層されている。図１（ｂ）に示すように、セパレータ１６は、帯状のものが折り曲げ部１６ａと平面部１６ｂとが交互に繰り返すつづら折り状に折り畳まれている。正極１４及び負極１５は、それぞれ矩形をなすとともに、１辺にタブ１４ａ，１５ａを有し、タブ１４ａ，１５ａがセパレータ１６の平面部１６ｂにおける折り曲げ部１６ａと直交する辺側に配置された状態でセパレータ１６の平面部１６ｂの間に挟まれて積層方向に交互に配置されている。即ち、正極１４及び負極１５は、枚葉電極として、セパレータ１６の平面部１６ｂの間に挟まれた状態で交互に配置されている。セパレータ１６は、材質がポリプロピレン（ＰＰ）やポリエチレン（ＰＥ）といった汎用熱可塑性樹脂で形成されている。電極組立体１２は、ケース１１に収容された状態で、セパレータ１６がケース１１の内面と対向するように構成されている。
Hereinafter, an embodiment embodying the present invention will be described with reference to FIGS.
As shown in FIG. 1A, a secondary battery 10 as a power storage device includes a case 11 in which a stacked electrode assembly 12 and an electrolytic solution 13 are accommodated. As shown in FIG. 1B, the electrode assembly 12 is laminated in a state where the positive electrode 14 and the negative electrode 15 are interposed with the separator 16 therebetween. As shown in FIG. 1 (b), the separator 16 is folded in a zigzag manner so that the band-like ones are alternately repeated between the bent portions 16a and the flat portions 16b. Each of the positive electrode 14 and the negative electrode 15 has a rectangular shape, and has tabs 14a and 15a on one side, and the tabs 14a and 15a are arranged on the side of the separator 16 at the side perpendicular to the bent portion 16a. The separators 16 are alternately arranged in the stacking direction between the flat portions 16b of the separators 16. That is, the positive electrode 14 and the negative electrode 15 are alternately arranged as a single-wafer electrode in a state of being sandwiched between the flat portions 16 b of the separator 16. The separator 16 is made of a general-purpose thermoplastic resin such as polypropylene (PP) or polyethylene (PE). The electrode assembly 12 is configured such that the separator 16 faces the inner surface of the case 11 while being accommodated in the case 11.
なお、図１（ｂ）においては、正極１４、負極１５及びセパレータ１６の関係を分かり易くするため、セパレータ１６の折り曲げ部１６ａがまだ融着されていない状態で示している。また、各折り曲げ部１６ａは、図１（ｂ）に示すような断面円弧状ではなく、実際は鋭角的に折り畳まれている。 In FIG. 1B, in order to make the relationship between the positive electrode 14, the negative electrode 15, and the separator 16 easy to understand, the bent portion 16a of the separator 16 is not yet fused. Moreover, each bending part 16a is not the circular arc shape of a cross section as shown in FIG.1 (b), but is actually folded acutely.
図１（ａ）に示すように、蓋１１ａには正極端子１７及び負極端子１８が固定されている。電極組立体１２は、正極１４のタブ１４ａの積層体１４ｐが正極用の導電部材１９を介して正極端子１７に電気的に接続されており、負極１５のタブ１５ａの積層体１５ｎが負極用の導電部材２０を介して負極端子１８に電気的に接続されている。積層体１４ｐは導電部材１９に溶接され、積層体１５ｎは導電部材２０に溶接されている。なお、正極端子１７及び負極端子１８は、ケース１１と電気的に絶縁されている。 As shown in FIG. 1A, a positive electrode terminal 17 and a negative electrode terminal 18 are fixed to the lid 11a. In the electrode assembly 12, the laminated body 14p of the tab 14a of the positive electrode 14 is electrically connected to the positive electrode terminal 17 via the conductive member 19 for positive electrode, and the laminated body 15n of the tab 15a of the negative electrode 15 is used for negative electrode. It is electrically connected to the negative electrode terminal 18 through the conductive member 20. The laminated body 14p is welded to the conductive member 19, and the laminated body 15n is welded to the conductive member 20. The positive terminal 17 and the negative terminal 18 are electrically insulated from the case 11.
セパレータ１６は、折り曲げ部１６ａが形成された２辺に設けられた融着部２１でセパレータ１６同士が積層方向に接合されている。融着部２１は、折り曲げ部１６ａに沿って連続する１本の線状に形成されている。 The separator 16 is joined to each other in the laminating direction by a fusion part 21 provided on two sides where the bent part 16a is formed. The fused part 21 is formed in a single linear shape that continues along the bent part 16a.
次に、電極組立体１２の製造方法を説明する。
図２に示すように、タブ１４ａ，１５ａの部分を除いて矩形状に形成された正極１４及び負極１５と、つづら折り状のセパレータ１６を準備する。正極１４及び負極１５は両面に活物質層が形成されている。そして、つづら折り状のセパレータ１６のそれぞれ対向する位置に、正極１４及び負極１５を交互に１枚ずつ挿入する。正極１４及び負極１５をセパレータ１６の対向する位置に挿入する際、タブ１４ａ，１５ａのセパレータ１６からの突出位置を見て所定の位置に配置した状態においてセパレータ１６で押さえて、次の正極１４あるいは負極１５を挿入することを繰り返す。そして、全ての正極１４及び負極１５を挿入した状態でセパレータ１６を押圧すると、図３に示すように、正極１４及び負極１５がセパレータ１６で挟持され、かつタブ１４ａ及びタブ１５ａが同じ側に突出した状態になる。
Next, a method for manufacturing the electrode assembly 12 will be described.
As shown in FIG. 2, a positive electrode 14 and a negative electrode 15 formed in a rectangular shape except for the tabs 14a and 15a, and a spell-folded separator 16 are prepared. The positive electrode 14 and the negative electrode 15 have active material layers formed on both sides. Then, the positive electrodes 14 and the negative electrodes 15 are alternately inserted one by one at positions facing each other of the zigzag separator 16. When the positive electrode 14 and the negative electrode 15 are inserted into positions facing the separator 16, the tabs 14 a and 15 a are pressed by the separator 16 in a state where the tabs 14 a and 15 a are projected from the separator 16 and placed at predetermined positions. The insertion of the negative electrode 15 is repeated. Then, when the separator 16 is pressed with all the positive electrodes 14 and the negative electrodes 15 inserted, as shown in FIG. 3, the positive electrodes 14 and the negative electrodes 15 are sandwiched between the separators 16 and the tabs 14a and the tabs 15a protrude to the same side. It will be in the state.
次にセパレータ１６を、タブ１４ａ，１５ａが突出しない対向する２辺、即ち折り曲げ部１６ａが形成された２辺において、熱融着（ヒートシール）を行う。熱融着は、正極１４及び負極１５に掛からない位置で行われ、融着部２１は正極１４及び負極１５の外側に位置する状態で、折り曲げ部１６ａに沿って連続する１本の線状に形成される。その結果、正極１４及び負極１５は、それぞれセパレータ１６の対向する面、即ち平面部１６ｂに押圧されて平面部１６ｂの間に挟まれた状態で所定位置に保持された状態になり、電極組立体１２が完成する。なお、セパレータ１６の熱融着（ヒートシール）は、例えば、加熱されたバーやローラをシールすべき箇所に押圧して行うシール機や、超音波シール機（超音波溶着機）を使用して行うことができる。そして、電極組立体１２は、タブ１４ａの積層体１４ｐが正極用の導電部材１９を介して正極端子１７に電気的に接続され、タブ１５ａの積層体１５ｎが負極用の導電部材２０を介して負極端子１８に電気的に接続された状態で、電解液１３と共にケース１１に収容されて、図１（ａ）に示す蓄電装置としての二次電池１０が構成される。 Next, the separator 16 is heat-sealed (heat sealed) on two opposite sides where the tabs 14a and 15a do not protrude, that is, two sides where the bent portions 16a are formed. The heat fusion is performed at a position where it does not reach the positive electrode 14 and the negative electrode 15, and the fusion part 21 is located on the outside of the positive electrode 14 and the negative electrode 15, and is continuous in a single line along the bent part 16 a. It is formed. As a result, each of the positive electrode 14 and the negative electrode 15 is held at a predetermined position while being pressed by the opposing surfaces of the separator 16, that is, the flat portion 16b and sandwiched between the flat portions 16b. 12 is completed. In addition, the heat sealing (heat sealing) of the separator 16 is performed using, for example, a sealing machine that presses a heated bar or roller against a portion to be sealed, or an ultrasonic sealing machine (ultrasonic welding machine). It can be carried out. In the electrode assembly 12, the laminated body 14p of the tab 14a is electrically connected to the positive electrode terminal 17 through the positive electrode conductive member 19, and the laminated body 15n of the tab 15a is connected through the negative electrode conductive member 20. A secondary battery 10 as a power storage device shown in FIG. 1A is configured by being housed in the case 11 together with the electrolyte solution 13 while being electrically connected to the negative electrode terminal 18.
次に前記のように構成された二次電池１０の作用を説明する。
二次電池１０は、単体でも使用されるが、一般には複数の二次電池１０が直列あるいは並列に接続されて構成された組電池として使用される。そして、二次電池１０は種々の用途に使用されるが、例えば、車両に搭載されて走行用モータの電源や他の電気機器の電源としても使用される。
Next, the operation of the secondary battery 10 configured as described above will be described.
Although the secondary battery 10 is used alone, it is generally used as an assembled battery in which a plurality of secondary batteries 10 are connected in series or in parallel. The secondary battery 10 is used for various applications. For example, the secondary battery 10 is mounted on a vehicle and used as a power source for a traveling motor or a power source for other electrical devices.
二次電池１０が車両に搭載されて使用される場合、走行中に二次電池１０に振動が加わる。電極組立体１２を構成する枚葉電極の正極１４及び負極１５と、つづら折り状に折り畳まれたセパレータ１６とは、セパレータ１６の折り曲げ部１６ａに形成された２辺が融着部２１で接合されているため、振動が加わっても正極１４、負極１５及びセパレータ１６相互の位置ずれが抑制、防止される。 When the secondary battery 10 is mounted on a vehicle and used, vibration is applied to the secondary battery 10 during traveling. The positive electrode 14 and the negative electrode 15 of the single-wafer electrode constituting the electrode assembly 12 and the separator 16 folded in a zigzag manner are joined at the fusion part 21 at the two sides formed in the bent part 16 a of the separator 16. Therefore, even if vibration is applied, the positional deviation between the positive electrode 14, the negative electrode 15, and the separator 16 is suppressed and prevented.
この実施形態によれば、以下に示す効果を得ることができる。
（１）二次電池１０（蓄電装置）は、正極１４及び負極１５がセパレータ１６を間に介在する状態で積層された積層型の電極組立体１２を有する。セパレータ１６は、帯状のものが折り曲げ部１６ａと平面部１６ｂとが交互に繰り返すつづら折り状に折り畳まれている。正極１４及び負極１５は、それぞれ矩形をなすとともに、１辺にタブ１４ａ，１５ａを有し、タブ１４ａ，１５ａがセパレータ１６の平面部１６ｂにおける折り曲げ部１６ａと直交する辺側に配置された状態でセパレータ１６の平面部１６ｂの間に挟まれて積層方向に交互に配置されている。セパレータ１６は、折り曲げ部１６ａが形成された２辺に設けられた融着部２１でセパレータ１６同士が積層方向に接合されている。したがって、つづら折り状に折り畳まれたセパレータ１６を介して正極１４及び負極１５が枚葉電極として交互に配置された積層型の電極組立体１２を製造する際に、正極１４、セパレータ１６及び負極１５を、位置ずれを抑制する状態で容易に接合することができる。
According to this embodiment, the following effects can be obtained.
(1) The secondary battery 10 (power storage device) includes a stacked electrode assembly 12 in which a positive electrode 14 and a negative electrode 15 are stacked with a separator 16 interposed therebetween. As for the separator 16, the strip | belt-shaped thing is folded in the shape of a zigzag where the bending part 16a and the plane part 16b repeat alternately. Each of the positive electrode 14 and the negative electrode 15 has a rectangular shape, and has tabs 14a and 15a on one side, and the tabs 14a and 15a are arranged on the side of the separator 16 at the side perpendicular to the bent portion 16a. The separators 16 are alternately arranged in the stacking direction between the flat portions 16b of the separators 16. The separator 16 is joined to each other in the laminating direction by a fusion part 21 provided on two sides where the bent part 16a is formed. Therefore, when manufacturing the stacked electrode assembly 12 in which the positive electrode 14 and the negative electrode 15 are alternately arranged as a single-wafer electrode through the separator 16 folded in a zigzag shape, the positive electrode 14, the separator 16 and the negative electrode 15 are , And can be easily joined in a state of suppressing displacement.
（２）融着部２１は、折り曲げ部１６ａに沿って連続する１本の線状に形成されている。融着部２１は、折り曲げ部１６ａに沿って間欠的に形成されてもよいが、連続する１本の線状に形成されている方が、正極１４及び負極１５を所定位置に保持し易く、熱融着を行うときにも連続的に行う方が、作業が簡単になる。 (2) The fused portion 21 is formed in a single line that is continuous along the bent portion 16a. The fused portion 21 may be formed intermittently along the bent portion 16a, but the one formed in a continuous single line is easier to hold the positive electrode 14 and the negative electrode 15 in a predetermined position, Even when heat fusion is performed continuously, the operation is simplified.
実施形態は前記に限定されるものではなく、例えば、次のように具体化してもよい。
○ タブ１４ａ，１５ａが突出しない対向する２辺、即ち折り曲げ部１６ａが形成された２辺に設けられた融着部２１は、折り曲げ部１６ａに沿って連続する１本の線状に限らず、点状に設けてもよい。融着部２１を点状に設ける場合、融着部２１は各辺に一点でもよいが、図４に示すように、複数箇所に設けることが好ましい。
The embodiment is not limited to the above, and may be embodied as follows, for example.
○ The two adjacent sides on which the tabs 14a and 15a do not protrude, that is, the two fusion-bonded portions 21 provided on the two sides where the bent portions 16a are formed, are not limited to a single linear shape along the bent portions 16a. It may be provided in a dot shape. When the fusion part 21 is provided in a dot shape, the fusion part 21 may be provided at one point on each side, but is preferably provided at a plurality of locations as shown in FIG.
○ 線状の融着部２１を断続的に設けてもよい。
○ 正極１４及び負極１５のタブ１４ａ，１５ａの突出位置は、矩形状の正極１４及び負極１５の一辺の端部に限らず、中央寄りにしてもよい。
O The linear fused part 21 may be provided intermittently.
The protruding positions of the tabs 14a and 15a of the positive electrode 14 and the negative electrode 15 are not limited to the ends of one side of the rectangular positive electrode 14 and the negative electrode 15, and may be closer to the center.
○ 電極組立体１２は、正極１４のタブ１４ａ及び負極１５のタブ１５ａが、同じ端部側に突出する構成に限らず、互いに反対側に突出する構成であってもよい。
○ セパレータ１６に設けられた融着部２１は、折り曲げ部１６ａが形成された２辺に少なくとも設けられていれば良く、その２辺に加えて他の辺に設けられていてもよい。この場合、セパレータ１６に挟まれた状態で保持されている正極１４及び負極１５は、位置ずれがより起こり難くなる。他の２辺に設けられる融着部２１も、線状でも点状でもよい。
The electrode assembly 12 is not limited to a configuration in which the tab 14a of the positive electrode 14 and the tab 15a of the negative electrode 15 protrude to the same end side, but may have a configuration that protrudes to the opposite side.
The fusion | melting part 21 provided in the separator 16 should just be provided at least in the 2 sides in which the bending part 16a was formed, and may be provided in another side in addition to the 2 sides. In this case, the positive electrode 14 and the negative electrode 15 that are held between the separators 16 are less likely to be misaligned. The fused portions 21 provided on the other two sides may also be linear or dotted.
○ 二次電池１０は、電極組立体１２がケース１１に収容された構成ではなく、電極組立体１２が電気的絶縁材からなる包装材に収容された、ラミネート型の構成であってもよい。 The secondary battery 10 may not have a configuration in which the electrode assembly 12 is accommodated in the case 11 but may have a laminate type configuration in which the electrode assembly 12 is accommodated in a packaging material made of an electrically insulating material.
○ セパレータ１６として、つづら折り状に折り畳まれた構成のものを使用する場合、正極１４及び負極１５の数が多い場合、セパレータ１６を１つではなく複数使用してもよい。 When the separator 16 is configured to be folded in a zigzag manner, when the number of the positive electrodes 14 and the negative electrodes 15 is large, a plurality of separators 16 may be used instead of one.
○ セパレータ１６は、熱融着可能であればよく、全体が熱可塑性樹脂製に限らず、耐熱性の高い熱可塑性の合成樹脂繊維を主体として、ガラス繊維を分散させてフェルト状の不織布としたものを使用してもよい。 ○ Separator 16 is not limited to thermoplastic resin as a whole as long as it can be heat-sealed, and is mainly composed of thermoplastic synthetic resin fibers having high heat resistance, and glass fibers are dispersed to form a felt-like nonwoven fabric. Things may be used.
○ 正極１４及び負極１５は、金属箔の少なくとも一方の面に活物質層が存在すればよく、金属箔の両面に活物質層を有する構成に限らず、金属箔の片面に活物質層を有する構成であってもよい。 The positive electrode 14 and the negative electrode 15 only have to have an active material layer on at least one surface of the metal foil, and the active material layer is not limited to the configuration having the active material layer on both surfaces of the metal foil, but has an active material layer on one surface of the metal foil. It may be a configuration.
○ 蓄電装置は、二次電池１０に限らず、例えば、電気二重層キャパシタやリチウムイオンキャパシタ等のようなキャパシタであってもよい。 The power storage device is not limited to the secondary battery 10 and may be a capacitor such as an electric double layer capacitor or a lithium ion capacitor.
１０…蓄電装置としての二次電池、１２…電極組立体、１４…正極、１４ａ，１５ａ…タブ、１５…負極、１６…セパレータ、１６ａ…折り曲げ部、１６ｂ…平面部、２１…融着部。 DESCRIPTION OF SYMBOLS 10 ... Secondary battery as an electrical storage device, 12 ... Electrode assembly, 14 ... Positive electrode, 14a, 15a ... Tab, 15 ... Negative electrode, 16 ... Separator, 16a ... Bending part, 16b ... Plane part, 21 ... Fusion part.
Claims (3)
前記セパレータは、帯状のものが折り曲げ部と平面部とが交互に繰り返すつづら折り状に折り畳まれ、
前記正極及び前記負極は、それぞれ矩形をなすとともに、１辺にタブを有し、前記タブが前記セパレータの前記平面部における前記折り曲げ部と直交する辺側に配置された状態で前記セパレータの平面部の間に挟まれて積層方向に交互に配置され、
前記セパレータは、前記折り曲げ部が形成された２辺に設けられた融着部で前記セパレータ同士が積層方向に接合されていることを特徴とする蓄電装置。 A power storage device having a stacked electrode assembly in which a positive electrode and a negative electrode are stacked with a separator interposed therebetween,
The separator is folded in a zigzag manner in which the band-shaped one repeats the bent portion and the flat portion alternately,
Each of the positive electrode and the negative electrode has a rectangular shape, and has a tab on one side, and the tab is disposed on the side of the separator perpendicular to the bent portion of the plane portion of the separator. Are alternately arranged in the stacking direction,
The power storage device, wherein the separator is bonded to each other in a laminating direction at a fusion part provided on two sides where the bent part is formed.
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