JP2014026768A - Secondary battery - Google Patents

Secondary battery Download PDF

Info

Publication number
JP2014026768A
JP2014026768A JP2012164705A JP2012164705A JP2014026768A JP 2014026768 A JP2014026768 A JP 2014026768A JP 2012164705 A JP2012164705 A JP 2012164705A JP 2012164705 A JP2012164705 A JP 2012164705A JP 2014026768 A JP2014026768 A JP 2014026768A
Authority
JP
Japan
Prior art keywords
separator
heat
resin sheet
resin
shaft core
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2012164705A
Other languages
Japanese (ja)
Other versions
JP5797610B2 (en
Inventor
Hiroki Hato
裕樹 破戸
Satoshi Watanabe
聡 渡辺
Toshiyuki Ariga
稔之 有賀
Yoshiji Iizuka
佳士 飯塚
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vehicle Energy Japan Inc
Original Assignee
Hitachi Vehicle Energy Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Vehicle Energy Ltd filed Critical Hitachi Vehicle Energy Ltd
Priority to JP2012164705A priority Critical patent/JP5797610B2/en
Publication of JP2014026768A publication Critical patent/JP2014026768A/en
Application granted granted Critical
Publication of JP5797610B2 publication Critical patent/JP5797610B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • 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

Abstract

PROBLEM TO BE SOLVED: To easily connect two separators to a shaft core, the separators having a simple structure while heat resistant layers of respective separators face each other.SOLUTION: A secondary battery 1 of the present application comprises an electrode group 40 formed by winding a pair of separators 43 and 44 around a shaft core 40a in a state where heat resistant layers 43b and 44b of respective separators are faced each other to be overlapped, the separators including the heat resistant layers 43b and 44b at at least one side surface of resin layers 43a and 44a, respectively, and the heat resistant layers 43b and 44b having a hole communicating in the thickness direction. The secondary battery includes a resin sheet 45 having one end part connected to the shaft core 40a and the other end part connected to the separators 43 and 44 in an overlapped manner.

Description

本発明は、軸芯に電極を捲回する電極群を有する二次電池に関する。   The present invention relates to a secondary battery having an electrode group in which an electrode is wound around an axis.

近年、電気自動車等の動力源として、エネルギー密度の高い二次電池の開発が進められており、その一つとして、正極電極と負極電極を間にセパレータを介在させて捲回した電極群を有するものがある。このようなエネルギー密度の高い二次電池では、大電流を流すため、電極群の正極電極が発熱することがあり、これに対して、セパレータの表面に耐熱層を設ける技術が考案されている。表面に耐熱層を有するセパレータを適用する場合、セパレータを溶着により接続させる製造においては課題が生じる。このうち、外周側のセパレータを溶着する際に、テープによる固定をしない技術が開示されている(特許文献１)。特許文献１では、セパレータの捲き終わり端部を内向きに折り返してセパレータの１周前の部分の外面に重ね合わせて樹脂層同士を対向させ、溶着させている。   In recent years, secondary batteries with high energy density have been developed as power sources for electric vehicles and the like, and one of them is an electrode group in which a positive electrode and a negative electrode are wound with a separator interposed therebetween. There is something. In such a secondary battery having a high energy density, a large current flows, so that the positive electrode of the electrode group may generate heat. On the other hand, a technique for providing a heat-resistant layer on the surface of the separator has been devised. When applying a separator having a heat-resistant layer on the surface, problems arise in the manufacture in which the separator is connected by welding. Among these, a technique is disclosed that does not fix with a tape when welding the separator on the outer peripheral side (Patent Document 1). In Patent Document 1, the end-of-rolling end of the separator is folded inward and overlapped with the outer surface of the part before one round of the separator so that the resin layers face each other and are welded.

特開２０１１−１７５７４９号公報JP 2011-175749 A

捲回式の電極群には、軸芯にセパレータの捲き始め端部を溶着して、セパレータに電極を重ね合わせて捲回した構造を有するものがある。具体的には、軸芯に２枚のセパレータの捲き始め端部を重ね合わせて溶着し、正極電極と負極電極の間に各セパレータが介在されるように捲回することで構成される。特許文献１では、軸芯とセパレータとの溶着に関しては考慮されていない。   Some winding-type electrode groups have a structure in which a winding start end portion of a separator is welded to an axis and the electrodes are wound on the separator. Specifically, the two separators are overlapped and welded to the shaft core, and wound so that each separator is interposed between the positive electrode and the negative electrode. In Patent Document 1, no consideration is given to the welding between the shaft core and the separator.

軸芯に２枚のセパレータを溶着する際に、特に各セパレータの耐熱層が互いに対向して配置されていると、溶着温度を高くしなければならないなどの問題点がある。   When two separators are welded to the shaft core, particularly when the heat-resistant layers of the separators are arranged to face each other, there is a problem that the welding temperature must be increased.

本発明は、上記の問題点に鑑みてなされたものであり、その目的は、耐熱層が対向する２枚のセパレータが軸芯に十分な強度で接続された電極群を有する二次電池を提供することである。   The present invention has been made in view of the above problems, and an object of the present invention is to provide a secondary battery having an electrode group in which two separators opposed to a heat-resistant layer are connected to a shaft core with sufficient strength. It is to be.

上記課題を解決するために、本発明の二次電池は、樹脂層の少なくとも一方の面に耐熱層が形成された第１セパレータおよび第２セパレータと、第１セパレータの耐熱層と第２セパレータの耐熱層とを対向させて、軸芯に捲回し始める捲回群を有する二次電池であって、一方の端部を軸芯に接続し、且つ、もう一方の端部を第１セパレータ、第２セパレータとを重ねて接続する樹脂シートを有することを特徴とする。   In order to solve the above problems, a secondary battery of the present invention includes a first separator and a second separator in which a heat-resistant layer is formed on at least one surface of a resin layer, a heat-resistant layer of the first separator, and a second separator. A secondary battery having a winding group facing a heat-resistant layer and starting to be wound on an axis, wherein one end is connected to the axis, and the other end is a first separator, It has the resin sheet which overlaps and connects 2 separators, It is characterized by the above-mentioned.

本発明によれば、耐熱層が対向する２枚のセパレータを容易かつ十分な強度で軸芯に接続することができる。なお、上記した以外の課題、構成及び効果は、以下の実施形態の説明により明らかにされる。   According to the present invention, it is possible to easily and sufficiently connect the two separators facing the heat-resistant layer to the shaft core. Problems, configurations, and effects other than those described above will be clarified by the following description of the embodiments.

本形態の形態に係わる二次電池の外観斜視図。The external appearance perspective view of the secondary battery concerning the form of this form. 図１に示された二次電池の分解斜視図。FIG. 2 is an exploded perspective view of the secondary battery shown in FIG. 1. 図２に示された電極群の詳細を示す、一部を展開した状態の外観斜視図。The external appearance perspective view of the state which expanded the part which shows the detail of the electrode group shown by FIG. 電極群製造装置の構成を示す図。The figure which shows the structure of an electrode group manufacturing apparatus. 実施例１の構成を説明する分解斜視図。FIG. 3 is an exploded perspective view illustrating the configuration of the first embodiment. 実施例１の構成を説明する模式図。FIG. 3 is a schematic diagram illustrating the configuration of the first embodiment. 実施例１の構成において軸芯を半周回転させた状態を示す模式図。FIG. 3 is a schematic diagram illustrating a state in which the shaft core is rotated half a turn in the configuration of the first embodiment. 実施例２の構成を説明する分解斜視図。FIG. 6 is an exploded perspective view illustrating the configuration of Embodiment 2. 実施例２の構成を説明する模式図。FIG. 6 is a schematic diagram illustrating a configuration of a second embodiment. 実施例２の構成において軸芯を半周回転させた状態を示す模式図。FIG. 6 is a schematic diagram showing a state where the shaft core is rotated half a turn in the configuration of the second embodiment. 実施例３の構成を説明する分解斜視図。FIG. 9 is an exploded perspective view illustrating the configuration of Embodiment 3. 実施例３の構成を説明する模式図。FIG. 6 is a schematic diagram illustrating a configuration of Example 3. 実施例３の構成において軸芯を半周回転させた状態を示す模式図。FIG. 10 is a schematic diagram showing a state where the shaft core is rotated half a turn in the configuration of the third embodiment. 実施例４の構成を説明する分解斜視図。FIG. 6 is an exploded perspective view illustrating the configuration of a fourth embodiment. 実施例４の構成を説明する模式図。FIG. 6 is a schematic diagram illustrating the configuration of a fourth embodiment. 実施例４の構成において軸芯を半周回転させた状態を示す模式図。The schematic diagram which shows the state which rotated the shaft center by the half circumference in the structure of Example 4. FIG.

以下、本実施の形態について図面を用いて説明する。   Hereinafter, the present embodiment will be described with reference to the drawings.

まず、二次電池の全体構成について説明し、次いで、各実施例の特徴構成について説明する。なお、以下の実施の形態では、板状の軸芯に電極を捲回した扁平状の電極群を有する角形二次電池の場合を例に説明するが、二次電池の形状は角形に限定されるものではなく、例えば丸棒状の軸芯に電極を捲回した円筒状の電極群を有する円筒形二次電池に適用することもできる。   First, the overall configuration of the secondary battery will be described, and then the characteristic configuration of each example will be described. In the following embodiments, a case of a rectangular secondary battery having a flat electrode group in which electrodes are wound on a plate-shaped shaft core will be described as an example. However, the shape of the secondary battery is limited to a rectangular shape. For example, the present invention can also be applied to a cylindrical secondary battery having a cylindrical electrode group in which an electrode is wound around a round bar-shaped shaft core.

図１は、本実施形態における二次電池の外観斜視図、図２は、図１に示された二次電池の分解斜視図である。   FIG. 1 is an external perspective view of a secondary battery according to this embodiment, and FIG. 2 is an exploded perspective view of the secondary battery shown in FIG.

二次電池１は、薄型のほぼ直方体形状の電池容器２内に、電極群４０が収容され、図示はしないが非水電解液が注入されて構成されている。電池容器２は、図１に示すように、電池蓋３と電池缶４を有している。電池蓋３および電池缶４は、例えば、アルミニウムあるいはアルミニウム合金などの金属製材料により構成されている。   The secondary battery 1 is configured such that an electrode group 40 is accommodated in a thin, substantially rectangular parallelepiped battery case 2 and a nonaqueous electrolyte is injected, although not shown. As shown in FIG. 1, the battery container 2 has a battery lid 3 and a battery can 4. The battery lid 3 and the battery can 4 are made of a metal material such as aluminum or an aluminum alloy, for example.

電池蓋３には、図２に示すように、正極集電板２１、負極集電板３１等が一体的に組みつけられており、電池蓋ユニット１０として構成されている。電池蓋ユニット１０の正極集電板２１および負極集電板３１は、それぞれ、電極群４０の正極金属箔４１aまたは負極金属箔４２aに、例えば、超音波溶接により接合されることにより、電池蓋・発電ユニット５０とされ、電池缶４の上端部の開口部から収容される。   As shown in FIG. 2, a positive electrode current collector plate 21, a negative electrode current collector plate 31, and the like are integrally assembled with the battery lid 3, and the battery lid unit 10 is configured. The positive electrode current collector plate 21 and the negative electrode current collector plate 31 of the battery lid unit 10 are respectively joined to the positive electrode metal foil 41a or the negative electrode metal foil 42a of the electrode group 40 by, for example, ultrasonic welding, thereby The power generation unit 50 is accommodated from the opening at the upper end of the battery can 4.

なお、図２においては、電池蓋・発電ユニット５０は、直接電池缶４内に収容される図となっているが、電池缶・発電ユニット５０を、一旦、電気的に絶縁性を有するシート等で包んでから収容する構造であってもよい。   In FIG. 2, the battery lid / power generation unit 50 is directly accommodated in the battery can 4, but the battery can / power generation unit 50 is temporarily electrically insulated from a sheet or the like. The structure may be accommodated after being wrapped in.

電池蓋３には、非水電解液を注入するための注液口（図示せず）が設けられており、注液栓１１で密閉される。また、電池蓋３には過充電等でリチウムイオン二次電池１の内部圧力が予め設定された上限値を超えて上昇した際に、電池容器２を解放して圧力を抜くためのガス排出弁１２が設けられている。ガス排出弁１２には開裂用の破断溝１２aが形成されている。   The battery lid 3 is provided with a liquid injection port (not shown) for injecting a non-aqueous electrolyte and is sealed with a liquid injection stopper 11. In addition, the battery cover 3 is a gas discharge valve for releasing the pressure by releasing the battery container 2 when the internal pressure of the lithium ion secondary battery 1 exceeds a preset upper limit value due to overcharge or the like. 12 is provided. The gas discharge valve 12 has a breaking groove 12a for cleavage.

非水電解液には、エチレンカーボネートとジメチルカーボネートとを体積比で１：２の割合で混合した混合液中に六フッ化リン酸リチウム（LiPF６）を１モル/リットルの濃度で溶解したものを用いることができる。 The non-aqueous electrolyte is a solution in which lithium hexafluorophosphate (LiPF 6 ) is dissolved at a concentration of 1 mol / liter in a mixed solution in which ethylene carbonate and dimethyl carbonate are mixed at a volume ratio of 1: 2. Can be used.

電池蓋３は、レーザー溶接によって電池缶４に接合されて、電池缶４の上端開口を閉塞する。そして、注液口（図示せず）から電解液を注入した後に、注液栓１１で注液口を塞ぎ、注液栓１１を電池蓋３にレーザー溶接して、外部から封口される。   The battery lid 3 is joined to the battery can 4 by laser welding to close the upper end opening of the battery can 4. And after inject | pouring electrolyte solution from a liquid injection port (not shown), a liquid injection port 11 plugs up a liquid injection port, the liquid injection port 11 is laser-welded to the battery cover 3, and is sealed from the outside.

電池蓋ユニット１０は、電池蓋３と正極側端子構成部２０と、負極側端子構成部３０を備える。正極側端子構成部２０は、外部正極端子２４、正極接続端子２５、正極端子板２６、絶縁板２７、ガスケット（図示せず）および正極集電板２１から構成される。外部正極端子２４、正極端子板２６、正極接続端子２５および正極集電板２１は、一体的に固定され、電池蓋３に取り付けられている。   The battery lid unit 10 includes a battery lid 3, a positive electrode side terminal configuration unit 20, and a negative electrode side terminal configuration unit 30. The positive electrode side terminal component 20 includes an external positive electrode terminal 24, a positive electrode connection terminal 25, a positive electrode terminal plate 26, an insulating plate 27, a gasket (not shown), and a positive electrode current collector plate 21. The external positive electrode terminal 24, the positive electrode terminal plate 26, the positive electrode connection terminal 25, and the positive electrode current collector plate 21 are integrally fixed and attached to the battery lid 3.

正極側端子構成部２０を作成するには次のようにする。予め、正極集電板２１を正極接続端子２５にかしめて固定しておく。そして、電池蓋３の貫通孔にガスケットを嵌入しておく。そして電池蓋３上に絶縁板２７を、電池蓋３の貫通孔と絶縁板２７の貫通孔とを位置合わせして配置する。   The positive electrode side terminal component 20 is produced as follows. In advance, the positive electrode current collecting plate 21 is caulked and fixed to the positive electrode connection terminal 25. Then, a gasket is inserted into the through hole of the battery lid 3. Then, the insulating plate 27 is disposed on the battery lid 3 so that the through holes of the battery lid 3 and the through holes of the insulating plate 27 are aligned.

次に、外部正極端子２４を正極端子板２６に設けられた貫通孔に嵌入し、絶縁板２７上で正極端子板２６に固定する。外部正極端子２４と正極端子板２６にかしめてもよい。また、正極集電板２１がかしめられた正極接続端子２５を電池蓋３の裏側からガスケットの貫通孔に挿入し、正極接続端子２５の先端部側を絶縁板２７および正極端子板２６の貫通孔に挿通する。正極接続端子２５の先端側は、正極端子板２６の貫通孔よりも僅かに小さい円筒形状を有しており、この正極接続端子２５の先端部分をかしめることにより、正極側端子構成部２０が電池蓋３に一体的に組み付けられる。   Next, the external positive terminal 24 is fitted into a through hole provided in the positive terminal plate 26 and fixed to the positive terminal plate 26 on the insulating plate 27. The external positive terminal 24 and the positive terminal plate 26 may be caulked. Further, the positive electrode connection terminal 25 with the positive electrode current collector plate 21 crimped is inserted into the through hole of the gasket from the back side of the battery lid 3, and the tip end side of the positive electrode connection terminal 25 is the through hole of the insulating plate 27 and the positive electrode terminal plate 26. Insert through. The tip end side of the positive electrode connection terminal 25 has a cylindrical shape that is slightly smaller than the through hole of the positive electrode terminal plate 26, and by caulking the tip end portion of the positive electrode connection terminal 25, the positive electrode side terminal component 20 is The battery cover 3 is assembled integrally.

この状態において、正極集電板２１、正極接続端子２５、正極端子板２６および外部正極端子２４は、電気的に接続されている。また、正極集電板２１、正極接続端子２５、正極端子板２６および外部正極端子２４は、絶縁板２７およびガスケット（図示せず）によって電池蓋３と絶縁されている。   In this state, the positive electrode current collector plate 21, the positive electrode connection terminal 25, the positive electrode terminal plate 26, and the external positive electrode terminal 24 are electrically connected. Further, the positive electrode current collector plate 21, the positive electrode connection terminal 25, the positive electrode terminal plate 26 and the external positive electrode terminal 24 are insulated from the battery cover 3 by an insulating plate 27 and a gasket (not shown).

負極側端子構成部３０は、外部負極端子３４、負極接続端子３５、負極端子板３６、絶縁板３７、ガスケット（図示せず）および負極集電板３１から構成される。外部負極端子３４、負極端子板３６、負極接続端子３５および負極集電板３１は、電池蓋３に一体的に組み付けられている。   The negative electrode side terminal component 30 includes an external negative electrode terminal 34, a negative electrode connection terminal 35, a negative electrode terminal plate 36, an insulating plate 37, a gasket (not shown), and a negative electrode current collector plate 31. The external negative electrode terminal 34, the negative electrode terminal plate 36, the negative electrode connection terminal 35, and the negative electrode current collector plate 31 are assembled integrally with the battery lid 3.

負極側端子構成部３０を作成するには次のようにする。予め、負極集電板３１を負極接続端子３５にかしめて固定しておく。そして、電池蓋３の貫通孔にガスケットを嵌入しておく。そして、電池蓋３上に絶縁板３７を、電池蓋３の貫通孔と絶縁板３７の貫通孔とを位置合わせして配置する。   The negative electrode side terminal component 30 is produced as follows. The negative electrode current collecting plate 31 is caulked and fixed to the negative electrode connection terminal 35 in advance. Then, a gasket is inserted into the through hole of the battery lid 3. Then, the insulating plate 37 is disposed on the battery lid 3 so that the through holes of the battery lid 3 and the through holes of the insulating plate 37 are aligned.

次に、外部負極端子３４を負極端子板３６に設けられた貫通孔に嵌入し、絶縁板３７上で負極端子板３６に固定する。また、負極集電板３１がかしめられた負極接続端子３５を電池蓋３の裏側からガスケットの貫通孔に挿入し、負極接続端子３５の先端部側を絶縁板３７および負極端子板３６の貫通孔に挿通する。   Next, the external negative electrode terminal 34 is fitted into a through hole provided in the negative electrode terminal plate 36 and fixed to the negative electrode terminal plate 36 on the insulating plate 37. Further, the negative electrode connection terminal 35 with the negative electrode current collecting plate 31 crimped is inserted into the through hole of the gasket from the back side of the battery lid 3, and the tip end side of the negative electrode connection terminal 35 is the through hole of the insulating plate 37 and the negative electrode terminal plate 36. Insert through.

負極接続端子３５の先端側は、負極端子板３６の貫通孔よりも僅かに小さい円筒形状を有しており、この負極接続端子３５の先端部分をかしめることにより、負極側端子構成部３０が電池蓋３に一体的に組み付けられている。   The distal end side of the negative electrode connection terminal 35 has a cylindrical shape slightly smaller than the through hole of the negative electrode terminal plate 36, and the negative electrode side terminal component 30 is formed by caulking the distal end portion of the negative electrode connection terminal 35. The battery cover 3 is integrally assembled.

この状態において、負極集電板３１、負極接続端子３５、負極端子板３６および外部負極端子３４は、電気的に接続されている。また、負極集電板３１、負極接続端子３５、負極端子板３６および外部負極端子３４は、絶縁板３７およびガスケット（図示せず）により電池蓋３と絶縁されている。   In this state, the negative electrode current collector plate 31, the negative electrode connection terminal 35, the negative electrode terminal plate 36, and the external negative electrode terminal 34 are electrically connected. In addition, the negative electrode current collector plate 31, the negative electrode connection terminal 35, the negative electrode terminal plate 36, and the external negative electrode terminal 34 are insulated from the battery lid 3 by an insulating plate 37 and a gasket (not shown).

電池蓋ユニット１０の正極集電板２１および負極集電板３１は、それぞれ、電極群４０の正極金属箔４１ａまたは負極金属箔４２ａに、超音波溶接により接合されて電気的に接続され、電池蓋・発電ユニット５０となる。   The positive electrode current collector plate 21 and the negative electrode current collector plate 31 of the battery lid unit 10 are joined and electrically connected to the positive electrode metal foil 41a or the negative electrode metal foil 42a of the electrode group 40 by ultrasonic welding, respectively. -It becomes the electric power generation unit 50.

以上により、二次電池１は、外部正極端子２４および外部負極端子３４に接続された外部電子機器に対して、充放電が可能な構造となる。   As described above, the secondary battery 1 has a structure capable of charging / discharging the external electronic device connected to the external positive terminal 24 and the external negative terminal 34.

図３は、図２に示された電極群の詳細を示し、一部を展開した状態の外観斜視図である。   FIG. 3 is an external perspective view showing the details of the electrode group shown in FIG.

電極群４０は、正極電極４１と、負極電極４２と、第１セパレータ４３と、第２セパレータ４４を重ね合わせた状態で、軸芯４０ａの周りに扁平状に捲回して形成されたものである。   The electrode group 40 is formed by winding a flat shape around the shaft core 40a in a state where the positive electrode 41, the negative electrode 42, the first separator 43, and the second separator 44 are overlapped. .

軸芯４０ａは、合成樹脂材料からなり、一対の扁平面を有する矩形の平板部材によって構成されている。軸芯４０ａには、後述する樹脂シート４５（図５を参照）を間に介して第１セパレータ４３および第２セパレータ４４が接続されている。   The shaft core 40a is made of a synthetic resin material and is configured by a rectangular flat plate member having a pair of flat surfaces. A first separator 43 and a second separator 44 are connected to the shaft core 40a via a resin sheet 45 (see FIG. 5) described later.

正極電極４１は、例えば、アルミニウム箔等からなる正極金属箔４１aの表裏両面に正極合剤層４１ｂが塗布されたものである。正極合剤層４１ｂは、一側縁に、正極金属箔４１aが露出された正極合剤未処理部４１ｃが形成されるように正極金属箔４１ａに正極合剤が塗布されて形成される。   The positive electrode 41 is obtained by, for example, applying a positive electrode mixture layer 41b to both front and back surfaces of a positive metal foil 41a made of an aluminum foil or the like. The positive electrode mixture layer 41b is formed by applying the positive electrode mixture to the positive electrode metal foil 41a so that the positive electrode mixture untreated portion 41c where the positive electrode metal foil 41a is exposed is formed on one side edge.

負極電極４２は、例えば、銅箔等からなる負極金属箔４２ａの表裏両面に負極合剤層４２ｂが塗布されたものである。負極合剤層４２ｂは、正極合剤未処理部４１ｃが配置された側縁と対向する側縁である他側縁に、負極金属箔４２ａが露出された負極合剤未処理部４２ｃが形成されるように負極金属箔４２ａに負極合剤が塗布されて形成される。   The negative electrode 42 is obtained by, for example, applying a negative electrode mixture layer 42b to both front and back surfaces of a negative electrode metal foil 42a made of copper foil or the like. In the negative electrode mixture layer 42b, a negative electrode mixture untreated portion 42c in which the negative electrode metal foil 42a is exposed is formed on the other side edge that is a side edge opposite to the side edge where the positive electrode mixture untreated portion 41c is disposed. Thus, the negative electrode metal foil 42a is formed by applying a negative electrode mixture.

正極合剤層４１ｂは、正極活物質としてマンガン酸リチウム（化学式LiMn２O4）に対し、導電材として鱗片状黒鉛と結着材としてポリフッ化ビニリデン（以下、PVDFという）とを添加し、これに分散溶媒としてN-メチルピロリドン（以下、NMPという）を添加、混練して作成する。この正極合剤を厚さ20μｍのアルミニウム箔の両面に正極合剤未処理部４１ｃを残して塗布する。その後、乾燥、プレス、裁断してアルミニウム箔を含まない正極活物質塗布部の厚さ（表裏両面の合計）90μｍの正極電極４１を得る。 The positive electrode mixture layer 41b is obtained by adding scaly graphite as a conductive material and polyvinylidene fluoride (hereinafter referred to as PVDF) as a binder to lithium manganate (chemical formula LiMn 2 O 4 ) as a positive electrode active material. N-methylpyrrolidone (hereinafter referred to as NMP) as a dispersion solvent is added and kneaded. This positive electrode mixture is applied to both surfaces of an aluminum foil having a thickness of 20 μm leaving the positive electrode mixture untreated portions 41c. Thereafter, drying, pressing, and cutting are performed to obtain a positive electrode 41 having a thickness of 90 μm (total of both front and back surfaces) of the positive electrode active material application portion that does not include the aluminum foil.

負極合剤層４２ｂは、負極活物質として非晶質炭素粉末に対して、結着材としてPVDFを添加し、これに分散溶媒としてNMPを添加、混練して作成する。この負極合剤を厚さ10μｍの銅箔の両面に負極合剤未処理部４２ｃを残して塗布する。その後、乾燥、プレス、裁断して銅箔を含まない負極活物質塗布部の厚さ（表裏両面の合計）70μｍの負極電極４２を得る。   The negative electrode mixture layer 42b is prepared by adding PVDF as a binder to amorphous carbon powder as a negative electrode active material, and adding and kneading NMP as a dispersion solvent thereto. This negative electrode mixture is applied to both sides of a 10 μm thick copper foil leaving the negative electrode mixture untreated portions 42c. Thereafter, drying, pressing, and cutting are performed to obtain a negative electrode 42 having a thickness of 70 μm (total of both front and back surfaces) of the negative electrode active material coating portion not including the copper foil.

第１セパレータ４３は、樹脂層４３ａと耐熱層４３ｂを有し、第２セパレータ４４は、樹脂層４４ａと耐熱層４４ｂを有する（例えば図５を参照）。耐熱層４３ｂ、４４ｂは、それぞれ樹脂層４３ａ、４４ａの少なくとも一方の面（片面）に形成されている。樹脂層４３ａ、４４ａは、例えばポリプロピレンの多孔質膜から形成されており、耐熱層４３ｂ、４４ｂは例えばセラミックフィラーを主成分としており、厚さ方向に連通する空孔を有している。樹脂層４３ａ、４４ａの厚みは、例えば２０μｍであり、耐熱層４３ｂ、４４ｂの厚みは、例えば５μmである（樹脂層：耐熱層＝４：１）。これら一対のセパレータである第１セパレータ４３と第２セパレータ４４は、互いの耐熱層４３ｂ、４４ｂを対向させて重ねた状態で軸芯４０ａに捲回される。   The first separator 43 has a resin layer 43a and a heat-resistant layer 43b, and the second separator 44 has a resin layer 44a and a heat-resistant layer 44b (see, for example, FIG. 5). The heat-resistant layers 43b and 44b are respectively formed on at least one surface (one surface) of the resin layers 43a and 44a. The resin layers 43a and 44a are formed of, for example, a polypropylene porous film, and the heat-resistant layers 43b and 44b are mainly composed of, for example, a ceramic filler and have pores communicating in the thickness direction. The resin layers 43a and 44a have a thickness of 20 μm, for example, and the heat-resistant layers 43b and 44b have a thickness of 5 μm, for example (resin layer: heat-resistant layer = 4: 1). The first separator 43 and the second separator 44, which are a pair of separators, are wound around the shaft core 40a in a state where the heat-resistant layers 43b and 44b face each other.

電極群４０を形成するには、軸芯４０ａに各捲き始め端部が接続された第１、第２セパレータ４３、４４の間に、それぞれ、負極電極４２の捲き始め端部と、正極電極４１の捲き始め端部を、負極電極４２が正極電極４１よりも内側に位置するように配置して捲回する。   In order to form the electrode group 40, the starting end portion of the negative electrode 42 and the positive electrode 41 are respectively interposed between the first and second separators 43 and 44, which are connected to the shaft core 40 a. The winding start end portion is arranged and wound so that the negative electrode 42 is located inside the positive electrode 41.

この場合、負極合剤層４２ｂの幅、換言すれば、捲回軸方向の長さは、正極合剤層４１ｂの幅よりも広く形成されている。また、第１セパレータ４３の幅は、正極電極４１の正極合剤未処理部４１ｃを、一側縁において外部に露出させる寸法とされている。同様に、第２セパレータ４４の幅は、負極電極４２の負極合剤未処理部４２ｃを他側縁において外部に露出させる寸法とされている。   In this case, the width of the negative electrode mixture layer 42b, in other words, the length in the winding axis direction is formed wider than the width of the positive electrode mixture layer 41b. Moreover, the width | variety of the 1st separator 43 is set as the dimension which exposes the positive electrode mixture unprocessed part 41c of the positive electrode 41 to the exterior in one side edge. Similarly, the width of the second separator 44 is set such that the negative electrode mixture untreated portion 42c of the negative electrode 42 is exposed to the outside at the other side edge.

図４は、電極群製造装置の構成を説明する図である。電極群製造装置７３は、正極電極４１と、負極電極４２と、第１セパレータ４３と、第２セパレータ４４を重ね合わせた状態で扁平状の軸芯４０ａに捲回して角型二次電池１の電極群４０を製造する構成を有する。   FIG. 4 is a diagram illustrating the configuration of the electrode group manufacturing apparatus. The electrode group manufacturing apparatus 73 is wound around the flat shaft core 40a in a state where the positive electrode 41, the negative electrode 42, the first separator 43, and the second separator 44 are overlapped with each other. The electrode group 40 is manufactured.

電極群製造装置７３は、第１セパレータ４３および第２セパレータ４４を接続するヒータブロック７０と、軸芯４０ａを捲回軸回りに回転可能に保持する保持手段と、保持手段に保持された軸芯４０ａの扁平面に対して直交する方向にヒータブロック７０を押圧する押圧手段を有している。   The electrode group manufacturing apparatus 73 includes a heater block 70 for connecting the first separator 43 and the second separator 44, a holding means for holding the shaft core 40a so as to be rotatable around the winding axis, and an axis core held by the holding means. There is a pressing means for pressing the heater block 70 in a direction orthogonal to the flat surface 40a.

保持手段は、図４に示すように、装置中央に扁平な軸芯４０ａを捲回軸方向両側から位置決め把持し、回転させる把持回転機構６６を備える。本実施形態では、把持回転機構６６は、水平方向に沿って軸芯４０ａの回転軸が配置されるように把持する。   As shown in FIG. 4, the holding means includes a gripping rotation mechanism 66 that positions and grips a flat shaft core 40 a at the center of the apparatus from both sides in the winding axis direction and rotates it. In the present embodiment, the gripping rotation mechanism 66 grips so that the rotation axis of the shaft core 40a is disposed along the horizontal direction.

押圧手段は、ヒータブロック７０を所定位置まで上昇させ、軸芯４０ａに押圧するヒータ昇降機構７１と、その押圧により軸芯４０ａが負けて曲がらないように軸芯４０ａを裏側から押さえる裏押さえ機構７２とを備える。   The pressing means raises the heater block 70 to a predetermined position and presses it against the shaft core 40a, and a back-holding mechanism 72 that presses the shaft core 40a from the back side so that the shaft core 40a is not bent and bent by the pressing. With.

そして、把持回転機構６６の側方には、上方から下方に向かって順番に負極電極４２、第１セパレータ４３、正極電極４１、第２セパレータ４４が、それぞれロール状態で配置されており、これらを把持回転機構６６に供給できるようになっている。また、各々の電極やセパレータを所定の長さだけ供給する送りローラ６０ａ〜６０ｄと所定長さで切断するカッタ６１ａ〜６１ｄを備える。第１セパレータ４３と、第２セパレータ４４は、軸芯４０ａに捲回された際に、耐熱層４３ｂ、４４ｂが互いに対向して間に正極電極４１を挟み込むように把持回転機構６６に供給される。   Then, on the side of the gripping rotation mechanism 66, the negative electrode 42, the first separator 43, the positive electrode 41, and the second separator 44 are arranged in a roll state in order from the upper side to the lower side. The gripping rotation mechanism 66 can be supplied. Further, feed rollers 60a to 60d for supplying each electrode and separator by a predetermined length and cutters 61a to 61d for cutting at a predetermined length are provided. The first separator 43 and the second separator 44 are supplied to the gripping rotation mechanism 66 so that the heat-resistant layers 43b and 44b face each other and sandwich the positive electrode 41 between them when wound around the shaft core 40a. .

第１セパレータ４３、第２セパレータ４４を、送り出し機構６０ａ、６０ｃで軸芯４０ａとヒータブロック７０の間に送り込んだ後、軸芯４０ａに第１セパレータ４３、第２セパレータ４４を押し付け仮位置決めするセパレータ仮押さえ６８を備える。   A separator that temporarily positions the first separator 43 and the second separator 44 by pressing the first separator 43 and the second separator 44 against the shaft core 40a after the first separator 43 and the second separator 44 are fed between the shaft core 40a and the heater block 70 by the feeding mechanisms 60a and 60c. A temporary presser 68 is provided.

捲回は、まず、第１セパレータ４３と第２セパレータ４４を重ねて軸芯４０ａに一体的に接続する。このときに必要となる熱と押圧はヒータブロック７０によって得ることができる。次に、第１セパレータ４３の耐熱層４３ｂと第２セパレータ４４の耐熱層４４ｂとの間に正極電極４１を配置して捲回する。このとき、負極電極４２を正極電極４１よりも内側に挿入することで最内周の正極電極４１の内側に負極電極４２を配置できる。   In winding, first, the first separator 43 and the second separator 44 are overlapped and integrally connected to the shaft core 40a. The heat and pressure required at this time can be obtained by the heater block 70. Next, the positive electrode 41 is disposed between the heat resistant layer 43 b of the first separator 43 and the heat resistant layer 44 b of the second separator 44 and wound. At this time, the negative electrode 42 can be arranged inside the innermost positive electrode 41 by inserting the negative electrode 42 inside the positive electrode 41.

電極群４０を捲回した後、解けないようにテープ６３を貼り付ける貼り付け手段６７を備える。テープ６３は送り出し機構６４を介し、カッタ６５で所定長さにカットされる。前述した送り機構６０ａ〜６０ｄは、捲回中に正極電極４１、第１セパレータ４３、負極電極４２、第２セパレータ４４に対し、バックテンションをかける役割も合わせ持つ。   After winding the electrode group 40, an attaching means 67 for attaching the tape 63 is provided so as not to be unwound. The tape 63 is cut into a predetermined length by the cutter 65 via the feed mechanism 64. The feeding mechanisms 60a to 60d described above also have a role of applying back tension to the positive electrode 41, the first separator 43, the negative electrode 42, and the second separator 44 during winding.

（実施例１）
図５は、実施例１の構成を説明する分解斜視図、図６は、実施例１の構成を説明する模式図、図７は、実施例１において軸芯を半周回転させた状態を示す図である。 Example 1
FIG. 5 is an exploded perspective view illustrating the configuration of the first embodiment, FIG. 6 is a schematic diagram illustrating the configuration of the first embodiment, and FIG. It is.

第１セパレータ４３および第２セパレータ４４は、樹脂層４３ａ、４４ａの片面にそれぞれ耐熱層４３ｂ、４４ｂを有する２層構造になっている。そして、互いの耐熱層４３ｂ、４４ｂが対向して軸芯４０ａに捲回される。第１セパレータ４３と第２セパレータ４４は、耐熱層４３ｂと耐熱層４４ｂを対向させて重ね合わせた状態とされ、互いの捲き始め端部が同じ位置に揃えられている。第１セパレータ４３および第２セパレータ４４は、第１セパレータ４３の捲き始め端部が軸芯４０ａ側（以下、内側という）に配置され、第２セパレータ４４の捲き始め端部が軸芯４０ａから離反する側（以下、外側という）に配置される。   The first separator 43 and the second separator 44 have a two-layer structure having heat-resistant layers 43b and 44b on one side of the resin layers 43a and 44a, respectively. The heat resistant layers 43b and 44b face each other and are wound around the shaft core 40a. The 1st separator 43 and the 2nd separator 44 are made into the state which piled up the heat-resistant layer 43b and the heat-resistant layer 44b facing each other, and the starting end part of each other is arranged in the same position. As for the 1st separator 43 and the 2nd separator 44, the rolling start end part of the 1st separator 43 is arrange | positioned at the shaft core 40a side (henceforth inner side), and the winding start end part of the 2nd separator 44 is separated from the shaft core 40a. It is arranged on the side (hereinafter referred to as the outside).

第１セパレータ４３及び第２セパレータ４４と軸芯４０ａは、樹脂シート４５を介して一体に接続されている。樹脂シート４５は、捲き始め端部（一方端部）が軸芯４０ａに接続され、捲き終わり端部（他方端部）が第１セパレータ４３と第２セパレータ４４に重ねた状態で接続されている。樹脂シート４５の幅は、軸芯４０ａの捲回部分の幅以上でかつセパレータ４３、４４の幅以下の大きさに設定され、樹脂シート４５の長さは、軸芯４０ａの半周以上の捲回長さに設定されている。   The first separator 43 and the second separator 44 and the shaft core 40a are integrally connected via a resin sheet 45. The resin sheet 45 is connected in a state in which a rolling start end portion (one end portion) is connected to the shaft core 40 a and a winding end end portion (the other end portion) is overlapped with the first separator 43 and the second separator 44. . The width of the resin sheet 45 is set to be not less than the width of the winding portion of the shaft core 40a and not more than the width of the separators 43 and 44, and the length of the resin sheet 45 is wound not less than a half circumference of the shaft core 40a. It is set to length.

樹脂シート４５は、第１セパレータ４３の捲き始め端部と第２セパレータ４４の捲き始め端部に重ねた状態で溶着される。この溶着領域では、第１セパレータ４３の捲き始め端部と第２セパレータ４４の捲き始め端部との間に樹脂シート４５の他方端部を介在させている。樹脂シート４５の捲き終わり端部は、第１セパレータ４３と第２セパレータ４４の互いに対向する耐熱層４３ｂと４４ｂとの間に挟み込まれる。そして、樹脂シート４５の捲き始め端部は、第１セパレータ４３の捲き始め端部および第２セパレータ４４の捲き始め端部より、捲回方向に突出して軸芯４０ａに接続されている。   The resin sheet 45 is welded in a state where the resin sheet 45 is overlapped with the starting start portion of the first separator 43 and the starting start portion of the second separator 44. In this welding region, the other end portion of the resin sheet 45 is interposed between the starting end portion of the first separator 43 and the starting end portion of the second separator 44. The end end portion of the resin sheet 45 is sandwiched between the heat-resistant layers 43b and 44b of the first separator 43 and the second separator 44 facing each other. And the rolling start end part of the resin sheet 45 protrudes from the winding start end part of the 1st separator 43 and the winding start end part of the 2nd separator 44 in the winding direction, and is connected to the shaft core 40a.

樹脂シート４５を接続する順番は、第１セパレータ４３及び第２セパレータ４４と、軸芯４０ａの何れを先に行っても良く、本実施の形態では、最初に、第１セパレータ４３及び第２セパレータ４４に接続し、次いで、軸芯４０ａに接続している。   The order of connecting the resin sheets 45 may be any of the first separator 43 and the second separator 44 and the shaft core 40a first. In the present embodiment, the first separator 43 and the second separator are first used. 44, and then connected to the shaft core 40a.

樹脂シート４５の捲き始め端部と軸芯４０ａとの接続は、図６に示すように、樹脂シート４５の捲き始め端部を軸芯４０ａの扁平面に重ね合わせて溶着することによって行われる。樹脂シート４５の捲き始め端部は、ヒータブロック７０のヒータヘッド７０ａを所定の押圧力で押し付けることによって部分的に加熱されて溶融され、その溶融した樹脂が軸芯４０ａに溶け込むことによって溶着され、その溶着強度は、捲回中のバックテンションによって剥がれない程度の所定の強度とされる。   As shown in FIG. 6, the connection between the starting end portion of the resin sheet 45 and the shaft core 40a is performed by overlapping the welding start end portion of the resin sheet 45 on the flat surface of the shaft core 40a. The starting end portion of the resin sheet 45 is partially heated and melted by pressing the heater head 70a of the heater block 70 with a predetermined pressing force, and the molten resin is welded by being melted into the shaft core 40a. The welding strength is a predetermined strength that does not peel off due to the back tension during winding.

樹脂シート４５の捲き終わり端部と第１セパレータ４３及び第２セパレータ４４との接続は、樹脂シート４５の捲き終わり端部を第１セパレータ４３の捲き始め端部と第２セパレータ４４の捲き始め端部との間に挟み込んだ状態で溶着することによって行われる。   The end of the resin sheet 45 is connected to the first separator 43 and the second separator 44 by connecting the end of the resin sheet 45 to the start end of the first separator 43 and the start of the second separator 44. It is performed by welding in a state of being sandwiched between parts.

第１セパレータ４３及び第２セパレータ４４を捲回中のバックテンションに対しても剥がれることなく所定の強度で接続させるためには、ヒータブロック７０のヒータヘッド７０ｂの熱を第２セパレータ４４から第１セパレータ４３まで十分に伝達させる必要がある。   In order to connect the first separator 43 and the second separator 44 to each other with a predetermined strength without being peeled against the back tension during winding, the heat of the heater head 70b of the heater block 70 is transferred from the second separator 44 to the first. It is necessary to sufficiently transmit to the separator 43.

本実施形態では、第１セパレータ４３と第２セパレータ４４の間、すなわち、互いに対向する耐熱層４３ｂと４４ｂとの間に樹脂シート４５を介在させた状態で、ヒータブロック７０のヒータヘッド７０ｂと裏押さえ７０ｃとの間に挟み込み、ヒータヘッド７０ｂにより、第２セパレータ４４の樹脂層４４ａを部分的に加熱して溶融させる。   In the present embodiment, the back side of the heater head 70b of the heater block 70 with the resin sheet 45 interposed between the first separator 43 and the second separator 44, that is, between the heat-resistant layers 43b and 44b facing each other. The resin layer 44a of the second separator 44 is partially heated and melted by the heater head 70b.

そして、その樹脂層４４ａの溶融樹脂を耐熱層４４ｂの空孔に溶け込ませて樹脂シート４５まで到達させ、樹脂層４４ａの溶融樹脂の熱を樹脂シート４５に伝達させ、その樹脂層４４ａの溶融樹脂の熱により樹脂シート４５を溶融させる。そして、その樹脂シート４５の溶融樹脂を第１セパレータ４３の耐熱層４３ｂの空孔に溶け込ませて樹脂層４３ａまで到達させ、樹脂シート４５の溶融樹脂の熱を樹脂層４３ａに伝達させ、その樹脂シート４５の溶融樹脂の熱により樹脂層４３ａを部分的に溶融させる。そして、樹脂シート４５の溶融樹脂を樹脂層４３ａの溶融樹脂に溶け込ませて樹脂シート４５を樹脂層４３ａに接続することができる。   Then, the molten resin of the resin layer 44a is melted into the holes of the heat-resistant layer 44b to reach the resin sheet 45, the heat of the molten resin of the resin layer 44a is transmitted to the resin sheet 45, and the molten resin of the resin layer 44a The resin sheet 45 is melted by this heat. Then, the molten resin of the resin sheet 45 is melted into the holes of the heat-resistant layer 43b of the first separator 43 to reach the resin layer 43a, and the heat of the molten resin of the resin sheet 45 is transmitted to the resin layer 43a. The resin layer 43a is partially melted by the heat of the molten resin of the sheet 45. And the molten resin of the resin sheet 45 can be dissolved in the molten resin of the resin layer 43a, and the resin sheet 45 can be connected to the resin layer 43a.

したがって、耐熱層４３ｂ、４４ｂの空孔に、樹脂を十分な量だけ溶け込ませることができ、軸芯４０ａと第１セパレータ４３および第２セパレータ４４とを、樹脂シート４５を介して所定の強度で一体的に接続させることができる。第１セパレータ４３及び第２セパレータ４４と樹脂シート４５との溶着は、第１セパレータ４３及び第２セパレータ４４の幅方向に沿って溶接部分と非溶接部分が形成されるように行われる。以上により、耐熱層４３ｂ、４４ｂが対向する２枚のセパレータ４３、４４を容易かつ十分な強度で軸芯４０ａに接続することができる。したがって、図７に示すように、軸芯４０ａを回転させることによって２枚のセパレータ４３、４４を軸芯４０ａの周りに捲回することができる。   Therefore, a sufficient amount of resin can be dissolved in the holes of the heat-resistant layers 43b and 44b, and the shaft core 40a, the first separator 43, and the second separator 44 can be connected to each other with a predetermined strength via the resin sheet 45. They can be connected together. The first separator 43 and the second separator 44 and the resin sheet 45 are welded so that a welded portion and a non-welded portion are formed along the width direction of the first separator 43 and the second separator 44. As described above, the two separators 43 and 44 facing the heat-resistant layers 43b and 44b can be easily and sufficiently connected to the shaft core 40a. Therefore, as shown in FIG. 7, the two separators 43 and 44 can be wound around the axis 40a by rotating the axis 40a.

このとき、第１セパレータ４３の樹脂層４３ａと第２セパレータ４４の樹脂層４４ａの厚みは、一定であり、変化させる必要がないので、二次電池１の内部抵抗が上昇する懸念はない。   At this time, since the thickness of the resin layer 43a of the first separator 43 and the resin layer 44a of the second separator 44 is constant and does not need to be changed, there is no concern that the internal resistance of the secondary battery 1 increases.

第２セパレータ４４の耐熱層４４ｂを第１セパレータ４３の耐熱層４３ｂに対向させて互いに重ねても、耐熱層４４ｂと耐熱層４３ｂの各空孔は必ずしも重ならないが、本実施例では、耐熱層４３ｂと４４ｂの間に樹脂シート４５を介在させているため、溶融樹脂が耐熱層４３ｂに溶け込む経路を十分に確保できる。   Even if the heat-resistant layer 44b of the second separator 44 is opposed to the heat-resistant layer 43b of the first separator 43 and overlaps each other, the holes of the heat-resistant layer 44b and the heat-resistant layer 43b do not necessarily overlap, but in this embodiment, the heat-resistant layer Since the resin sheet 45 is interposed between 43b and 44b, it is possible to ensure a sufficient path for the molten resin to melt into the heat-resistant layer 43b.

また、樹脂シート４５は、セパレータ４３、４４の樹脂層４３ａ，４４ａの厚さ２０μｍに対して、セパレータのように空孔を設ける必要が無い分だけ、その厚さを薄くすることができ、例えば10〜15μｍとすることができる。樹脂シート４５の材質は、例えばセパレータ４３、４４の樹脂層４３ａ，４４ａと同じポリプロピレンである。   Further, the thickness of the resin sheet 45 can be reduced with respect to the thickness of 20 μm of the resin layers 43a and 44a of the separators 43 and 44, as much as it is not necessary to provide holes like the separator. It can be 10-15 micrometers. The material of the resin sheet 45 is, for example, the same polypropylene as the resin layers 43a and 44a of the separators 43 and 44.

電極群４０の製作過程において、セパレータの先捲きの後に、９０〜１００μmの厚みを有する負極電極４２、正極電極４１が挿入される。樹脂シート４５の厚みは、正極電極４１、負極電極４２の厚みに対し、十分に小さいため、電極群４０の形状及び性能への影響はない。したがって、接続部分の厚みは電極の厚みより小さければ良い。そして、本実施例では、樹脂シート４５の厚みは、第２セパレータ４４の耐熱層の厚さ以上の厚さに設定されている。   In the manufacturing process of the electrode group 40, the negative electrode 42 and the positive electrode 41 having a thickness of 90 to 100 μm are inserted after the front of the separator. Since the thickness of the resin sheet 45 is sufficiently smaller than the thicknesses of the positive electrode 41 and the negative electrode 42, the shape and performance of the electrode group 40 are not affected. Therefore, the thickness of the connecting portion may be smaller than the thickness of the electrode. In this embodiment, the thickness of the resin sheet 45 is set to be equal to or greater than the thickness of the heat resistant layer of the second separator 44.

（実施例2）
図８は、実施例２の構成を説明する分解斜視図、図９は、実施例２の構成を説明する模式図、図１０は、実施例２において軸芯を半周回転させた状態を示す模式図である。 (Example 2)
FIG. 8 is an exploded perspective view illustrating the configuration of the second embodiment, FIG. 9 is a schematic diagram illustrating the configuration of the second embodiment, and FIG. FIG.

本実施形態において特徴的なことは、第１セパレータ４３よりも軸芯４０ａに対し内側、つまり軸芯４０ａに近接する方向に樹脂シート４５を配置させていることである。   What is characteristic in the present embodiment is that the resin sheet 45 is arranged on the inner side of the shaft core 40a than the first separator 43, that is, in a direction close to the shaft core 40a.

第１セパレータ４３と第２セパレータ４４は、図８に示すように、耐熱層４３ｂと耐熱層４４ｂを対向させて重ね合わせかつ互いの捲き始め端部を同じ位置に揃えた状態とされ、軸芯４０ａに対して内側に第１セパレータ４３の捲き始め端部が配置され、外側に第２セパレータ４４の捲き始め端部が配置される。   As shown in FIG. 8, the first separator 43 and the second separator 44 are overlapped with the heat-resistant layer 43b and the heat-resistant layer 44b facing each other, and are arranged in such a state that the starting ends of each other are aligned at the same position. The starting start portion of the first separator 43 is disposed inside 40a, and the starting start portion of the second separator 44 is disposed outside.

樹脂シート４５は、第１セパレータ４３の内側、すなわち第１セパレータ４３の樹脂層４３ａの上に重ねた状態で溶着される。この溶着領域では、第１セパレータ４３の捲き始め端部の軸芯側に樹脂シート４５の捲き終わり端部を配置している。そして、樹脂シート４５の捲き始め端部は、第１セパレータ４３の捲き始め端部および第２セパレータ４４の捲き始め端部より、捲回方向に突出している。   The resin sheet 45 is welded in a state of being overlapped on the inside of the first separator 43, that is, on the resin layer 43 a of the first separator 43. In this welding region, the end portion of the resin sheet 45 is disposed on the axial center side of the end portion of the first separator 43. The rolling start end of the resin sheet 45 protrudes in the winding direction from the rolling start end of the first separator 43 and the rolling start end of the second separator 44.

樹脂シート４５の捲き始め端部と軸芯４０ａとの接続は、実施例１と同様であるので説明を省略する。   Since the connection between the starting end portion of the resin sheet 45 and the shaft core 40a is the same as that in the first embodiment, the description thereof is omitted.

樹脂シート４５の捲き終わり端部と第１セパレータ４３及び第２セパレータ４４との接続は、樹脂シート４５の捲き終わり端部を第１セパレータ４３の樹脂層４３ａに重ね合わせた状態で溶着することによって行われる。本実施形態では、第１セパレータ４３の樹脂層４３ａに樹脂シート４５を重ねた状態で、ヒータヘッド７０ｂと裏押さえ７０ｃとの間に挟み込み、ヒータヘッド７０ｂにより、第２セパレータ４４の樹脂層４４ａを部分的に加熱して溶融させる。   The connection between the end of the resin sheet 45 and the first separator 43 and the second separator 44 is performed by welding the end of the end of the resin sheet 45 on the resin layer 43 a of the first separator 43. Done. In the present embodiment, the resin sheet 45 is stacked on the resin layer 43a of the first separator 43, and is sandwiched between the heater head 70b and the back presser 70c, and the resin layer 44a of the second separator 44 is formed by the heater head 70b. Partially heat to melt.

そして、その樹脂層４４ａの溶融樹脂を耐熱層４４ｂの空孔に溶け込ませて第１セパレータ４３との境界面まで到達させ、その境界面から第１セパレータ４３の耐熱層４３ｂの空孔に溶け込ませて第１セパレータ４３の樹脂層４３ａまで到達させる。そして、第１セパレータ４３の樹脂層４３ａに、樹脂層４４ａの溶融樹脂の熱を伝達させ、その樹脂層４４ａの溶融樹脂の熱により第１セパレータ４３の樹脂層４３ａを溶融させ、樹脂層４４ａの溶融樹脂を樹脂層４３ａの溶融樹脂に溶け込ませて第２セパレータ４４に第１セパレータ４３を溶着する。   Then, the molten resin of the resin layer 44a is melted into the pores of the heat-resistant layer 44b to reach the boundary surface with the first separator 43, and is melted into the pores of the heat-resistant layer 43b of the first separator 43 from the boundary surface. To reach the resin layer 43a of the first separator 43. Then, the heat of the molten resin of the resin layer 44a is transmitted to the resin layer 43a of the first separator 43, and the resin layer 43a of the first separator 43 is melted by the heat of the molten resin of the resin layer 44a. The first separator 43 is welded to the second separator 44 by melting the molten resin into the molten resin of the resin layer 43a.

そして、樹脂層４３ａの溶融樹脂の熱を樹脂シート４５に伝達させて、樹脂シート４５を部分的に溶融させる。そして、樹脂層４３ａの溶融樹脂を樹脂シート４５の溶融樹脂に溶け込ませて第１セパレータ４３を樹脂シート４５に溶着することができる。   And the heat | fever of the molten resin of the resin layer 43a is transmitted to the resin sheet 45, and the resin sheet 45 is partially melted. Then, the first separator 43 can be welded to the resin sheet 45 by melting the molten resin of the resin layer 43 a into the molten resin of the resin sheet 45.

したがって、耐熱層４３ｂ、４４ｂの空孔に、樹脂を十分な量だけ溶け込ませることができ、軸芯４０ａと第１セパレータ４３および第２セパレータ４４とを、樹脂シート４５を介して所定の強度で一体的に接続することができる。第１セパレータ４３及び第２セパレータ４４と樹脂シート４５との溶着は、第１セパレータ４３及び第２セパレータ４４の幅方向に沿って溶接部分と非溶接部分が形成されるように行われる。以上により、耐熱層４３ｂ、４４ｂが対向する２枚のセパレータ４３、４４を容易かつ十分な強度で軸芯４０ａに接続することができる。したがって、図１０に示すように、軸芯４０ａを回転させることによって樹脂シート４５を軸芯４０ａの周りに捲回し、続いて２枚のセパレータ４３、４４を捲回することができる。   Therefore, a sufficient amount of resin can be dissolved in the holes of the heat-resistant layers 43b and 44b, and the shaft core 40a, the first separator 43, and the second separator 44 can be connected to each other with a predetermined strength via the resin sheet 45. Can be connected together. The first separator 43 and the second separator 44 and the resin sheet 45 are welded so that a welded portion and a non-welded portion are formed along the width direction of the first separator 43 and the second separator 44. As described above, the two separators 43 and 44 facing the heat-resistant layers 43b and 44b can be easily and sufficiently connected to the shaft core 40a. Therefore, as shown in FIG. 10, by rotating the shaft core 40a, the resin sheet 45 can be wound around the shaft core 40a, and then the two separators 43 and 44 can be wound.

第２セパレータ４４の耐熱層４４ｂを第１セパレータ４３の耐熱層４３ｂに対向させて互いに重ねても、耐熱層４４ｂと耐熱層４３ｂの各空孔は必ずしも重ならないが、本実施例では、第２セパレータ４４の樹脂層４４ａの溶融樹脂が、第２セパレータ４４の耐熱層４４ｂの空孔を通って、耐熱層４４ｂと耐熱層４３ｂとの境界面に流れ込み、境界面に沿って拡がることで、溶融樹脂が第１セパレータ４３の耐熱層４３ｂの空孔に溶け込む経路を十分に確保できる。   Even if the heat-resistant layer 44b of the second separator 44 is opposed to the heat-resistant layer 43b of the first separator 43 and overlaps each other, the holes of the heat-resistant layer 44b and the heat-resistant layer 43b do not necessarily overlap. The molten resin in the resin layer 44a of the separator 44 flows into the boundary surface between the heat-resistant layer 44b and the heat-resistant layer 43b through the holes in the heat-resistant layer 44b of the second separator 44, and spreads along the boundary surface, thereby melting. A sufficient path for the resin to melt into the pores of the heat-resistant layer 43b of the first separator 43 can be secured.

本実施例によれば、図１０に示すように、樹脂シート４５を凹凸なく軸芯４０ａの外周に沿って滑らかに捲回することができる。したがって、その外側に、第１セパレータ４３及び第２セパレータ４４、正極電極４１、負極電極４２を凹凸なく滑らかに捲回することができる。   According to the present embodiment, as shown in FIG. 10, the resin sheet 45 can be smoothly wound around the outer periphery of the shaft core 40a without unevenness. Therefore, the 1st separator 43 and the 2nd separator 44, the positive electrode 41, and the negative electrode 42 can be smoothly wound on the outer side without an unevenness | corrugation.

（実施例3）
図１１は、実施例３の構成を説明する分解斜視図、図１２は、実施例３の構成を説明する模式図、図１３は、実施例３において軸芯を半周回転させた状態を示す図である。 (Example 3)
FIG. 11 is an exploded perspective view illustrating the configuration of the third embodiment, FIG. 12 is a schematic diagram illustrating the configuration of the third embodiment, and FIG. It is.

本実施形態において特徴的なことは、第２セパレータ４４よりも軸芯４０aに対し外側、つまり軸芯４０ａから離反する側に樹脂シート４５を配置させていることである。   What is characteristic in the present embodiment is that the resin sheet 45 is arranged on the outer side with respect to the shaft core 40a than the second separator 44, that is, on the side away from the shaft core 40a.

第１セパレータ４３と第２セパレータ４４は、図１１に示すように、耐熱層４３ｂと耐熱層４４ｂを対向させて重ね合わせかつ互いの捲き始め端部を同じ位置に揃えた状態とされている。樹脂シート４５は、第２セパレータ４４の外側、すなわち樹脂層４４ａの表面に樹脂シート４５の捲き終わり端部を重ねた状態で溶着される。この溶着領域では、第２セパレータ４４の捲き始め端部の外側に樹脂シート４５の捲き終わり端部を配置している。そして、樹脂シート４５の捲き始め端部は、第１セパレータ４３の捲き始め端部および第２セパレータ４４の捲き始め端部より、捲回方向に突出している。   As shown in FIG. 11, the first separator 43 and the second separator 44 are in a state in which the heat-resistant layer 43 b and the heat-resistant layer 44 b are opposed to each other, and the starting ends of the two are aligned at the same position. The resin sheet 45 is welded in a state where the end portion of the rolled end of the resin sheet 45 overlaps the outside of the second separator 44, that is, the surface of the resin layer 44a. In this welding region, the end portion of the resin sheet 45 is disposed outside the end portion of the second separator 44. The rolling start end of the resin sheet 45 protrudes in the winding direction from the rolling start end of the first separator 43 and the rolling start end of the second separator 44.

樹脂シート４５の捲き始め端部と軸芯４０ａとの接続は、実施例１と同様であるので説明を省略する。   Since the connection between the starting end portion of the resin sheet 45 and the shaft core 40a is the same as that in the first embodiment, the description thereof is omitted.

樹脂シート４５の捲き終わり端部と第１セパレータ４３及び第２セパレータ４４との接続は、樹脂シート４５の捲き終わり端部を第２セパレータ４４の樹脂層４４ａに重ね合わせた状態で溶着することによって行われる。本実施形態では、第２セパレータ４４の樹脂層４４ａに樹脂シート４５を重ねた状態で、ヒータヘッド７０ｂと裏押さえ７０ｃとの間に挟み込み、ヒータヘッド７０ｂにより、樹脂シート４５を部分的に加熱して溶融させる。   The connection between the end portion of the resin sheet 45 and the first separator 43 and the second separator 44 is performed by welding the end portion of the resin sheet 45 on the resin layer 44 a of the second separator 44. Done. In the present embodiment, the resin sheet 45 is stacked on the resin layer 44a of the second separator 44 and is sandwiched between the heater head 70b and the back presser 70c, and the resin sheet 45 is partially heated by the heater head 70b. Melt.

そして、第２セパレータ４４の樹脂層４４ａに、樹脂シート４５の溶融樹脂の熱を伝達させ、その熱により第２のセパレータ４４の樹脂層４４ａを溶融させ、樹脂シート４５の溶融樹脂を樹脂層４４ａの溶融樹脂に溶け込ませて樹脂シート４５を第２セパレータ４４に溶着する。   Then, the heat of the molten resin of the resin sheet 45 is transmitted to the resin layer 44a of the second separator 44, the resin layer 44a of the second separator 44 is melted by the heat, and the molten resin of the resin sheet 45 is transferred to the resin layer 44a. Then, the resin sheet 45 is welded to the second separator 44.

そして、樹脂層４４ａの溶融樹脂を耐熱層４４ｂの空孔に溶け込ませて第１セパレータ４３との境界面まで到達させ、その境界面から第１セパレータ４３の耐熱層４３ｂの空孔に溶け込ませて第１セパレータ４３の樹脂層４３ａまで到達させる。そして、第１セパレータ４３の樹脂層４３ａに、樹脂層４４ａの溶融樹脂の熱を伝達させ、その樹脂層４４ａの溶融樹脂の熱により第１セパレータ４３の樹脂層４３ａを溶融させ、樹脂層４４ａの溶融樹脂を樹脂層４３ａの溶融樹脂に溶け込ませて第２セパレータ４４に第１セパレータ４３を溶着する。   Then, the molten resin of the resin layer 44a is melted into the pores of the heat-resistant layer 44b to reach the boundary surface with the first separator 43, and from the boundary surface to the pores of the heat-resistant layer 43b of the first separator 43. It reaches the resin layer 43 a of the first separator 43. Then, the heat of the molten resin of the resin layer 44a is transmitted to the resin layer 43a of the first separator 43, and the resin layer 43a of the first separator 43 is melted by the heat of the molten resin of the resin layer 44a. The first separator 43 is welded to the second separator 44 by melting the molten resin into the molten resin of the resin layer 43a.

したがって、耐熱層４３ｂ、４４ｂの空孔に、樹脂を十分な量だけ溶け込ませることができ、軸芯４０ａと第１セパレータ４３および第２セパレータ４４とを、樹脂シート４５を介して所定の強度で一体的に接続することができる。第１セパレータ４３及び第２セパレータ４４と樹脂シート４５との溶着は、第１セパレータ４３及び第２セパレータ４４の幅方向に沿って溶接部分と非溶接部分が形成されるように行われる。以上により、耐熱層４３ｂ、４４ｂが対向する２枚のセパレータ４３、４４を容易かつ十分な強度で軸芯４０ａに接続することができる。したがって、図１３に示すように、軸芯４０ａを回転させることによって樹脂シート４５を軸芯４０ａの周りに捲回し、続いて２枚のセパレータ４３、４４を捲回することができる。   Therefore, a sufficient amount of resin can be dissolved in the holes of the heat-resistant layers 43b and 44b, and the shaft core 40a, the first separator 43, and the second separator 44 can be connected to each other with a predetermined strength via the resin sheet 45. Can be connected together. The first separator 43 and the second separator 44 and the resin sheet 45 are welded so that a welded portion and a non-welded portion are formed along the width direction of the first separator 43 and the second separator 44. As described above, the two separators 43 and 44 facing the heat-resistant layers 43b and 44b can be easily and sufficiently connected to the shaft core 40a. Therefore, as shown in FIG. 13, by rotating the shaft core 40a, the resin sheet 45 can be wound around the shaft core 40a, and then the two separators 43 and 44 can be wound.

第２セパレータ４４の耐熱層４４ｂを第１セパレータ４３の耐熱層４３ｂに対向させて互いに重ねても、耐熱層４４ｂと耐熱層４３ｂの各空孔は必ずしも重ならないが、本実施例では、樹脂シート４５および第２セパレータ４４の樹脂層４４ａの溶融樹脂が、第２セパレータ４４の耐熱層４４ｂの空孔を通って、第２セパレータ４４の耐熱層４４ｂと第１セパレータ４３の耐熱層４３ｂとの境界面に流れ込み、境界面に沿って拡がることで、溶融樹脂が第１セパレータ４４の耐熱層４３ｂの空孔に溶け込む経路を十分に確保できる。   Even if the heat-resistant layer 44b of the second separator 44 is opposed to the heat-resistant layer 43b of the first separator 43 and overlaps each other, the holes of the heat-resistant layer 44b and the heat-resistant layer 43b do not necessarily overlap, but in this embodiment, the resin sheet 45 and the molten resin of the resin layer 44 a of the second separator 44 pass through the holes of the heat resistant layer 44 b of the second separator 44, and the boundary between the heat resistant layer 44 b of the second separator 44 and the heat resistant layer 43 b of the first separator 43. By flowing into the surface and spreading along the boundary surface, it is possible to secure a sufficient path for the molten resin to melt into the pores of the heat-resistant layer 43b of the first separator 44.

本実施例によれば、樹脂シート４５を第２セパレータ４４の外側、つまり軸芯４０ａに対し離反する方向に配置しているので、電極群製造装置７３を用いて製造する際に、樹脂シート４５のハンドリングが容易になる。したがって、電極群製造装置７３に簡単な構造のハンドリング装置を付加するだけで実現することができ、設備費やメンテナンス費等のコストを低く抑えることができる。   According to the present embodiment, since the resin sheet 45 is disposed outside the second separator 44, that is, in a direction away from the shaft core 40a, the resin sheet 45 is produced when the electrode group production apparatus 73 is used for production. Is easy to handle. Therefore, it can be realized simply by adding a handling device having a simple structure to the electrode group manufacturing apparatus 73, and costs such as equipment costs and maintenance costs can be kept low.

また、軸芯４０ａを半周回転させることによって、軸芯４０ａと樹脂シート４５との間に、第１セパレータ４３と第２セパレータ４４の各捲き始め端部を挟み込んで保持することができ、第１セパレータ４３と第２セパレータ４４を軸芯４０ａに確実に固定することができる。   Further, by rotating the shaft core 40a by a half circumference, the respective rolling start end portions of the first separator 43 and the second separator 44 can be sandwiched and held between the shaft core 40a and the resin sheet 45. The separator 43 and the second separator 44 can be reliably fixed to the shaft core 40a.

（実施例4）
図１４は、実施例４の構成を説明する分解斜視図、図１５は、実施例４の構成を説明する模式図、図１６は、実施例４において軸芯を半周回転させた状態を示す図である。 (Example 4)
FIG. 14 is an exploded perspective view illustrating the configuration of the fourth embodiment, FIG. 15 is a schematic diagram illustrating the configuration of the fourth embodiment, and FIG. It is.

本実施形態において特徴的なことは、両面に耐熱層を有する２枚のセパレータの間に樹脂シート４５を介在させた構成としたことである。第１セパレータ４３と第２セパレータ４４は、樹脂層４３ａ、４４ａの両面にそれぞれ耐熱層４３ｂ１、４３ｂ２、４４ｂ１、４４ｂ２が設けられた３層構造を有している。上記構成を有する第１セパレータ４３と第２セパレータ４４を重ねて接続する場合、必ず、互いの耐熱層同士が対向する。この領域において、対向する耐熱層４３ｂ２、４４ｂ１の間に、樹脂シート４５の捲き終わり端部を介在させている。樹脂シート４５の捲き始め端部は、第１セパレータ４３の捲き始め端部および第２セパレータ４４の捲き始め端部より、捲回方向に突出して配置される。   What is characteristic in the present embodiment is that a resin sheet 45 is interposed between two separators having heat-resistant layers on both sides. The first separator 43 and the second separator 44 have a three-layer structure in which heat-resistant layers 43b1, 43b2, 44b1, and 44b2 are provided on both surfaces of the resin layers 43a and 44a, respectively. When the first separator 43 and the second separator 44 having the above configuration are connected in an overlapping manner, the heat-resistant layers are always opposed to each other. In this region, the end portion of the resin sheet 45 is interposed between the opposing heat-resistant layers 43b2 and 44b1. The rolling start end portion of the resin sheet 45 is disposed so as to protrude in the winding direction from the winding start end portion of the first separator 43 and the winding start end portion of the second separator 44.

樹脂シート４５の捲き始め端部と軸芯４０ａとの接続は、実施例１と同様であるので説明を省略する。   Since the connection between the starting end portion of the resin sheet 45 and the shaft core 40a is the same as that in the first embodiment, the description thereof is omitted.

樹脂シート４５の捲き終わり端部と第１セパレータ４３及び第２セパレータ４４との接続は、樹脂シート４５の捲き終わり端部を第１セパレータ４３の捲き始め端部と第２セパレータ４４の捲き始め端部との間に挟み込んだ状態で溶着することによって行われる。   The end of the resin sheet 45 is connected to the first separator 43 and the second separator 44 by connecting the end of the resin sheet 45 to the start end of the first separator 43 and the start of the second separator 44. It is performed by welding in a state of being sandwiched between parts.

第１セパレータ４３及び第２セパレータ４４を捲回中のバックテンションに対しても剥がれることなく所定の強度で接続させるためには、ヒータブロック７０のヒータヘッド７０ｂの熱を第２セパレータ４４から第１セパレータ４３まで十分に伝達させる必要がある。   In order to connect the first separator 43 and the second separator 44 to each other with a predetermined strength without being peeled against the back tension during winding, the heat of the heater head 70b of the heater block 70 is transferred from the second separator 44 to the first. It is necessary to sufficiently transmit to the separator 43.

本実施形態では、第１セパレータ４３と第２セパレータ４４の間、すなわち、互いに対向する耐熱層４３ｂと４４ｂとの間に樹脂シート４５を介在させた状態で、ヒータブロック７０のヒータヘッド７０ｂと裏押さえ７０ｃとの間に挟み込み、ヒータヘッド７０ｂにより、第２セパレータ４４の樹脂層４４ａを部分的に加熱して溶融させる。   In the present embodiment, the back side of the heater head 70b of the heater block 70 with the resin sheet 45 interposed between the first separator 43 and the second separator 44, that is, between the heat-resistant layers 43b and 44b facing each other. The resin layer 44a of the second separator 44 is partially heated and melted by the heater head 70b.

そして、その樹脂層４４ａの溶融樹脂を耐熱層４４ｂ１の空孔に溶け込ませて樹脂シート４５まで到達させ、樹脂層４４ａの溶融樹脂の熱を樹脂シート４５に伝達させ、その樹脂層４４ａの溶融樹脂の熱により樹脂シート４５を溶融させ、樹脂層４４ａの溶融樹脂を樹脂シート４５の溶融樹脂に溶け込ませて第２セパレータ４４を樹脂シート４５に溶着する。   Then, the molten resin of the resin layer 44a is melted into the holes of the heat-resistant layer 44b1 to reach the resin sheet 45, the heat of the molten resin of the resin layer 44a is transmitted to the resin sheet 45, and the molten resin of the resin layer 44a The resin sheet 45 is melted by this heat, the molten resin of the resin layer 44 a is melted into the molten resin of the resin sheet 45, and the second separator 44 is welded to the resin sheet 45.

そして、樹脂シート４５の溶融樹脂を、第１セパレータ４３の耐熱層４３ｂ２の空孔に溶け込ませて樹脂層４３ａまで到達させ、樹脂シート４５の溶融樹脂の熱を樹脂層４３ａに伝達させて、樹脂層４３ａを部分的に溶融させる。そして、樹脂シート４５の溶融樹脂を樹脂層４３ａの溶融樹脂に溶け込ませて樹脂シート４５を第１セパレータ４３に溶着する。   Then, the molten resin of the resin sheet 45 is melted into the holes of the heat-resistant layer 43b2 of the first separator 43 to reach the resin layer 43a, and the heat of the molten resin of the resin sheet 45 is transmitted to the resin layer 43a, so that the resin Layer 43a is partially melted. Then, the molten resin of the resin sheet 45 is melted into the molten resin of the resin layer 43 a to weld the resin sheet 45 to the first separator 43.

したがって、耐熱層４３ｂ２、４４ｂ１の空孔に、樹脂を十分な量だけ溶け込ませることができ、軸芯４０ａと第１セパレータ４３および第２セパレータ４４とを、樹脂シート４５を介して所定の強度で一体的に接続させることができる。第１セパレータ４３及び第２セパレータ４４と樹脂シート４５との溶着は、第１セパレータ４３及び第２セパレータ４４の幅方向に沿って溶接部分と非溶接部分が形成されるように行われる。以上により、両面に耐熱層を有する２枚のセパレータ４３、４４を容易かつ十分な強度で軸芯４０ａに接続することができる。したがって、図７に示すように、軸芯４０ａを回転させることによって２枚のセパレータ４３、４４を軸芯４０ａの周りに捲回することができる。   Therefore, a sufficient amount of resin can be dissolved in the holes of the heat-resistant layers 43b2 and 44b1, and the shaft core 40a, the first separator 43, and the second separator 44 can be connected to each other with a predetermined strength via the resin sheet 45. They can be connected together. The first separator 43 and the second separator 44 and the resin sheet 45 are welded so that a welded portion and a non-welded portion are formed along the width direction of the first separator 43 and the second separator 44. As described above, the two separators 43 and 44 having the heat-resistant layers on both surfaces can be easily and sufficiently connected to the shaft core 40a. Therefore, as shown in FIG. 7, the two separators 43 and 44 can be wound around the axis 40a by rotating the axis 40a.

このとき、第１セパレータ４３の樹脂層４３ａと第２セパレータ４４の樹脂層４４ａの厚みは、一定であり、変化させる必要がないので、二次電池１の内部抵抗が上昇する懸念はない。   At this time, since the thickness of the resin layer 43a of the first separator 43 and the resin layer 44a of the second separator 44 is constant and does not need to be changed, there is no concern that the internal resistance of the secondary battery 1 increases.

第２セパレータ４４の耐熱層４４ｂ１を第１セパレータ４３の耐熱層４３ｂ２に対向させて互いに重ねても、耐熱層４４ｂ１と耐熱層４３ｂ２の各空孔は必ずしも重ならないが、本実施例では、耐熱層４３ｂ１と４４ｂ２の間に樹脂シート４５を介在させているため、溶融樹脂が耐熱層４３ｂに溶け込む経路を十分に確保できる。   Even if the heat-resistant layer 44b1 of the second separator 44 is opposed to the heat-resistant layer 43b2 of the first separator 43 and overlaps each other, the holes of the heat-resistant layer 44b1 and the heat-resistant layer 43b2 do not necessarily overlap, but in this embodiment, the heat-resistant layer Since the resin sheet 45 is interposed between 43b1 and 44b2, a sufficient path for the molten resin to melt into the heat-resistant layer 43b can be secured.

前述の実施形態は、角形二次電池の構造を前提に説明したが、耐熱層を有するセパレータが軸芯に接続される構造であれば角形に拘る必要は無く、円筒形二次電池においても適用可能である。   The above-described embodiment has been described on the assumption of the structure of a prismatic secondary battery. However, if the separator having a heat-resistant layer is connected to the shaft core, there is no need to be concerned with the prismatic shape, and it can be applied to a cylindrical secondary battery. Is possible.

また、上述の各実施例では、樹脂層４３ａと４４ａとの厚さが同じであり、また、耐熱層４３ｂと４４ｂとの厚さが同じである場合を例に説明したが、これらの厚さは同一に限定されるものではなく、相違していてもよい。   In each of the above-described embodiments, the case where the resin layers 43a and 44a have the same thickness and the heat-resistant layers 43b and 44b have the same thickness has been described as an example. Are not limited to the same, and may be different.

以上、本発明の実施形態について詳述したが、本発明は、前記の実施形態に限定されるものではなく、特許請求の範囲に記載された本発明の精神を逸脱しない範囲で、種々の設計変更を行うことができるものである。例えば、前記した実施の形態は本発明を分かりやすく説明するために詳細に説明したものであり、必ずしも説明した全ての構成を備えるものに限定されるものではない。また、ある実施形態の構成の一部を他の実施形態の構成に置き換えることが可能であり、また、ある実施形態の構成に他の実施形態の構成を加えることも可能である。さらに、各実施形態の構成の一部について、他の構成の追加・削除・置換をすることが可能である。   Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various designs can be made without departing from the spirit of the present invention described in the claims. It can be changed. For example, the above-described embodiment has been described in detail for easy understanding of the present invention, and is not necessarily limited to one having all the configurations described. Further, a part of the configuration of an embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of an embodiment. Furthermore, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

１ 二次電池
４０ 電極群
４０ａ 軸芯
４３ 第１セパレータ
４３ａ 第１セパレータの樹脂層
４３ｂ 第１セパレータの耐熱層
４４ 第２セパレータ
４４ａ 第２セパレータの樹脂層
４４ｂ 第２セパレータの耐熱層
４５ 樹脂シート
DESCRIPTION OF SYMBOLS 1 Secondary battery 40 Electrode group 40a Shaft core 43 1st separator 43a 1st separator resin layer 43b 1st separator heat resistant layer 44 2nd separator 44a 2nd separator resin layer 44b 2nd separator heat resistant layer 45 Resin sheet

Claims (6)

樹脂層の少なくとも一方面に耐熱層が設けられ、該耐熱層が厚さ方向に連通する空孔を有する一対のセパレータを、互いの耐熱層を対向させて重ねた状態で軸芯に捲回した電極群を有する二次電池であって、
一方端部が前記軸芯に接続され、他方端部が前記一対のセパレータに重ねて接続された樹脂シートを有することを特徴とする二次電池。 A pair of separators provided with a heat-resistant layer on at least one surface of the resin layer and having pores communicating with the heat-resistant layer in the thickness direction were wound around the shaft core with the heat-resistant layers facing each other. A secondary battery having an electrode group,
A secondary battery comprising a resin sheet having one end connected to the shaft core and the other end overlapped with the pair of separators. 前記一対のセパレータは、前記軸芯側に捲き始め端部が配置される第１セパレータと、該第１セパレータの捲き始め端部の外側に捲き始め端部が配置される第２セパレータと、を有し、
前記樹脂シートは、前記第１セパレータの捲き始め端部と前記第２セパレータの捲き始め端部に重ねた状態で溶着されることを特徴とする請求項１に記載の二次電池。 The pair of separators includes: a first separator having a winding start end disposed on the shaft core side; and a second separator having a winding start end disposed outside the winding start end of the first separator. Have
2. The secondary battery according to claim 1, wherein the resin sheet is welded in a state where the resin sheet is overlapped with a starting start portion of the first separator and a starting start portion of the second separator. 前記樹脂シートの他方端部と前記第１セパレータの捲き始め端部と前記第２セパレータの捲き始め端部とが重ねた状態で溶着される溶着領域において、前記第１セパレータの捲き始め端部と前記第２セパレータの捲き始め端部との間に前記樹脂シートの他方端部を介在させた構造を有することを特徴とする請求項２に記載の二次電池。   In the welding region where the other end portion of the resin sheet, the starting start portion of the first separator and the starting start portion of the second separator are overlapped, the starting start portion of the first separator; 3. The secondary battery according to claim 2, wherein the secondary battery has a structure in which the other end of the resin sheet is interposed between the end of the second separator. 前記樹脂シートの他方端部と前記第１セパレータの捲き始め端部と前記第２セパレータの捲き始め端部とが重ねた状態で溶着される溶着領域において、前記第１セパレータの捲き始め端部の前記軸芯側に前記樹脂シートの他方端部を配置した構造を有することを特徴とする請求項２に記載の二次電池。   In the welding region where the other end portion of the resin sheet, the rolling start end portion of the first separator, and the winding start end portion of the second separator are overlapped, the cracking start end portion of the first separator The secondary battery according to claim 2, wherein the secondary battery has a structure in which the other end portion of the resin sheet is disposed on the shaft core side. 前記樹脂シートの他方端部と前記第１セパレータの捲き始め端部と前記第２セパレータの捲き始め端部とが重ねて接続される接続領域において、第２セパレータの捲き始め端部の前記軸芯から離れる側に前記樹脂シートの他方端部を配置した構造を有することを特徴とする請求項２に記載の二次電池。   In the connection region where the other end portion of the resin sheet, the rolling start end portion of the first separator, and the winding start end portion of the second separator are overlapped and connected, the shaft core of the rolling start end portion of the second separator The secondary battery according to claim 2, wherein the secondary battery has a structure in which the other end of the resin sheet is disposed on a side away from the battery. 前記第１セパレータと前記第２セパレータは、前記樹脂層の両面に前記耐熱層が形成されていることを特徴とする請求項２又は３に記載の二次電池。
4. The secondary battery according to claim 2, wherein the first separator and the second separator have the heat-resistant layer formed on both surfaces of the resin layer. 5.
JP2012164705A 2012-07-25 2012-07-25 Secondary battery Active JP5797610B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2012164705A JP5797610B2 (en) 2012-07-25 2012-07-25 Secondary battery

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2012164705A JP5797610B2 (en) 2012-07-25 2012-07-25 Secondary battery

Publications (2)

Publication Number Publication Date
JP2014026768A true JP2014026768A (en) 2014-02-06
JP5797610B2 JP5797610B2 (en) 2015-10-21

Family

ID=50200251

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2012164705A Active JP5797610B2 (en) 2012-07-25 2012-07-25 Secondary battery

Country Status (1)

Country Link
JP (1) JP5797610B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017027681A (en) * 2015-07-16 2017-02-02 日立オートモティブシステムズ株式会社 Secondary battery

Citations (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1064589A (en) * 1996-08-22 1998-03-06 Matsushita Electric Ind Co Ltd Thin battery and its manufacture
JP2000156241A (en) * 1998-11-19 2000-06-06 Japan Storage Battery Co Ltd Battery
JP2001185220A (en) * 1999-12-24 2001-07-06 Shin Kobe Electric Mach Co Ltd Cylindrical lithium ion battery
JP2001229970A (en) * 2000-02-16 2001-08-24 Shin Kobe Electric Mach Co Ltd Cylindrical lithium battery
JP2009224235A (en) * 2008-03-18 2009-10-01 Ckd Corp Winding up device, winding element, and manufacturing method of winding element
JP2009252467A (en) * 2008-04-04 2009-10-29 Ckd Corp Manufacturing device of wound-around element
JP2009259747A (en) * 2008-04-21 2009-11-05 Ckd Corp Method of manufacturing winding device
JP2009289661A (en) * 2008-05-30 2009-12-10 Katoh Kiko Co Ltd Tape wound body manufacturing device
JP2011076862A (en) * 2009-09-30 2011-04-14 Gs Yuasa Corp Winding-type battery, and manufacturing method for power generation body of winding-type battery
WO2011148866A1 (en) * 2010-05-26 2011-12-01 株式会社Ｇｓユアサ Battery
JP2012022813A (en) * 2010-07-12 2012-02-02 Toyota Motor Corp Electrode winding device and method for manufacturing wound electrode body cell
WO2012077226A1 (en) * 2010-12-10 2012-06-14 日立ビークルエナジー株式会社 Secondary battery
WO2013108372A1 (en) * 2012-01-18 2013-07-25 日立ビークルエナジー株式会社 Secondary battery
JP2013191467A (en) * 2012-03-14 2013-09-26 Gs Yuasa Corp Power storage element, wound electrode body and winding device
JP2013239433A (en) * 2012-04-18 2013-11-28 Gs Yuasa Corp Electricity storage element, winding apparatus, and winding method
JP2013251201A (en) * 2012-06-01 2013-12-12 Gs Yuasa Corp Power storage element, electrode body, winding method, and winding device

Patent Citations (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1064589A (en) * 1996-08-22 1998-03-06 Matsushita Electric Ind Co Ltd Thin battery and its manufacture
JP2000156241A (en) * 1998-11-19 2000-06-06 Japan Storage Battery Co Ltd Battery
JP2001185220A (en) * 1999-12-24 2001-07-06 Shin Kobe Electric Mach Co Ltd Cylindrical lithium ion battery
JP2001229970A (en) * 2000-02-16 2001-08-24 Shin Kobe Electric Mach Co Ltd Cylindrical lithium battery
JP2009224235A (en) * 2008-03-18 2009-10-01 Ckd Corp Winding up device, winding element, and manufacturing method of winding element
JP2009252467A (en) * 2008-04-04 2009-10-29 Ckd Corp Manufacturing device of wound-around element
JP2009259747A (en) * 2008-04-21 2009-11-05 Ckd Corp Method of manufacturing winding device
JP2009289661A (en) * 2008-05-30 2009-12-10 Katoh Kiko Co Ltd Tape wound body manufacturing device
JP2011076862A (en) * 2009-09-30 2011-04-14 Gs Yuasa Corp Winding-type battery, and manufacturing method for power generation body of winding-type battery
WO2011148866A1 (en) * 2010-05-26 2011-12-01 株式会社Ｇｓユアサ Battery
JP2012022813A (en) * 2010-07-12 2012-02-02 Toyota Motor Corp Electrode winding device and method for manufacturing wound electrode body cell
WO2012077226A1 (en) * 2010-12-10 2012-06-14 日立ビークルエナジー株式会社 Secondary battery
WO2013108372A1 (en) * 2012-01-18 2013-07-25 日立ビークルエナジー株式会社 Secondary battery
JP2013191467A (en) * 2012-03-14 2013-09-26 Gs Yuasa Corp Power storage element, wound electrode body and winding device
JP2013239433A (en) * 2012-04-18 2013-11-28 Gs Yuasa Corp Electricity storage element, winding apparatus, and winding method
JP2013251201A (en) * 2012-06-01 2013-12-12 Gs Yuasa Corp Power storage element, electrode body, winding method, and winding device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017027681A (en) * 2015-07-16 2017-02-02 日立オートモティブシステムズ株式会社 Secondary battery

Also Published As

Publication number Publication date
JP5797610B2 (en) 2015-10-21

Similar Documents

Publication Publication Date Title
JP5864620B2 (en) Manufacturing method of secondary battery
JP4378657B2 (en) Battery and power supply
JP5456542B2 (en) Rectangular secondary battery and method for manufacturing prismatic secondary battery
EP3036783B1 (en) Nonaqueous electrolyte battery and manufacturing method thereof
WO2013111256A1 (en) Secondary battery
JP6414898B2 (en) Non-aqueous electrolyte secondary battery electrode, method for producing the same, and non-aqueous electrolyte secondary battery
JP5550923B2 (en) Method for manufacturing prismatic secondary battery
JP6423250B2 (en) Secondary battery
WO2012124188A1 (en) Electrode for nonaqueous secondary batteries, method for producing same, and nonaqueous secondary battery
JP2010086780A (en) Square secondary battery
JP6261441B2 (en) Secondary battery
WO2013164916A1 (en) Flat wound secondary battery and method for producing same
JP2014216252A (en) Square secondary battery
JP6104383B2 (en) Flat rechargeable secondary battery
WO2012127623A1 (en) Secondary cell and method for manufacturing same
JP4204243B2 (en) Battery manufacturing method
JP5797610B2 (en) Secondary battery
JP6781074B2 (en) Rechargeable battery
JP2011216209A (en) Laminated battery and its manufacturing method
JP6563008B2 (en) Secondary battery
JP2013232439A (en) Flat wound secondary battery and method for manufacturing the same
JP6401589B2 (en) Lithium secondary battery
JP6358060B2 (en) Electrode body
WO2013098968A1 (en) Method for producing electrode and method for producing non-aqueous electrolyte battery
JP6302797B2 (en) Prismatic secondary battery

Legal Events

Date Code Title Description
A711 Notification of change in applicant

Free format text: JAPANESE INTERMEDIATE CODE: A712

Effective date: 20140807

A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20140828

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20150227

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20150331

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20150601

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20150721

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20150819

R150 Certificate of patent or registration of utility model

Ref document number: 5797610

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

S111 Request for change of ownership or part of ownership

Free format text: JAPANESE INTERMEDIATE CODE: R313111

R350 Written notification of registration of transfer

Free format text: JAPANESE INTERMEDIATE CODE: R350

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250