JP5692154B2 - Nonaqueous electrolyte secondary battery - Google Patents

Nonaqueous electrolyte secondary battery Download PDF

Info

Publication number
JP5692154B2
JP5692154B2 JP2012104173A JP2012104173A JP5692154B2 JP 5692154 B2 JP5692154 B2 JP 5692154B2 JP 2012104173 A JP2012104173 A JP 2012104173A JP 2012104173 A JP2012104173 A JP 2012104173A JP 5692154 B2 JP5692154 B2 JP 5692154B2
Authority
JP
Japan
Prior art keywords
electrode
battery case
wound
separator
secondary battery
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.)
Active
Application number
JP2012104173A
Other languages
Japanese (ja)
Other versions
JP2013232354A (en
Inventor
隆洋 渡邉
隆洋 渡邉
敏也 岡田
敏也 岡田
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.)
Toyota Motor Corp
Original Assignee
Toyota Motor Corp
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 Toyota Motor Corp filed Critical Toyota Motor Corp
Priority to JP2012104173A priority Critical patent/JP5692154B2/en
Publication of JP2013232354A publication Critical patent/JP2013232354A/en
Application granted granted Critical
Publication of JP5692154B2 publication Critical patent/JP5692154B2/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

Description

本発明は、非水電解質二次電池の電極体の構成技術に関する。   The present invention relates to a technology for constructing an electrode body of a non-aqueous electrolyte secondary battery.

非水電解質二次電池は、例えばリチウムイオン二次電池が良く知られている。リチウムイオン二次電池は、近年、電気自動車等の車両搭載用電源、あるいは、パソコン及び携帯端末その他の電気製品等に搭載される電源として重要性が高まっている。   As the non-aqueous electrolyte secondary battery, for example, a lithium ion secondary battery is well known. In recent years, lithium ion secondary batteries have become increasingly important as power sources mounted on vehicles such as electric vehicles, or power sources mounted on personal computers, portable terminals, and other electrical products.

リチウムイオン二次電池は、例えば、箱形の電池ケースと、電池ケースの内部に収容される電極体と、電池ケースにレーザ溶接により接合されることで電池ケースの開口部を封口する封口体（蓋体）と、から構成されている。また、リチウムイオン二次電池の電極体は、例えば、負極とセパレータと正極とを積層した状態で捲回し、さらに偏平させた捲回電極体として構成されている。   Lithium ion secondary batteries include, for example, a box-shaped battery case, an electrode body housed inside the battery case, and a sealing body that seals the opening of the battery case by being joined to the battery case by laser welding ( Lid). Moreover, the electrode body of a lithium ion secondary battery is comprised as a wound electrode body which wound, for example in the state which laminated | stacked the negative electrode, the separator, and the positive electrode, and was further flattened.

リチウムイオン二次電池の製造工程では、電池ケースに捲回電極体を収容し、レーザ溶接により電池ケースに封口体を溶接して、電池ケースの開口部を封口する。このとき、電池ケースと封口体との隙間からレーザ光線が電池ケース内部に漏れて入り込み、捲回電極体の最外周を照射する場合がある。   In the manufacturing process of the lithium ion secondary battery, the wound electrode body is accommodated in the battery case, the sealing body is welded to the battery case by laser welding, and the opening of the battery case is sealed. At this time, the laser beam may leak into the battery case from the gap between the battery case and the sealing body and irradiate the outermost periphery of the wound electrode body.

捲回電極体の最外周にレーザ光線が照射した場合には、レーザ光線がセパレータを透過し、負極に塗工された負極合材によって吸収される（最外周の電極が負極の場合）。レーザ光線を吸収した負極合材は、発熱し、その発熱によって周囲のセパレータが損傷する。セパレータが損傷した部分では、正極と負極とが接触して内部短絡が発生するおそれがある。そこで、非水電解質二次電池では、封口体をレーザ溶接によって電池ケースに接合する際のセパレータの損傷を防止することが求められている。   When the outermost periphery of the wound electrode body is irradiated with a laser beam, the laser beam passes through the separator and is absorbed by the negative electrode mixture applied to the negative electrode (when the outermost electrode is a negative electrode). The negative electrode mixture that has absorbed the laser beam generates heat, and the surrounding separator is damaged by the generated heat. In the damaged part of the separator, the positive electrode and the negative electrode may come into contact with each other and an internal short circuit may occur. Therefore, in the nonaqueous electrolyte secondary battery, it is required to prevent the separator from being damaged when the sealing body is joined to the battery case by laser welding.

特開２００８−１７１５８３号公報JP 2008-171583 A

本発明の解決しようとする課題は、封口体をレーザ溶接によって電池ケースに接合する際のセパレータの損傷を防止できる非水電解質二次電池を提供することである。   The problem to be solved by the present invention is to provide a non-aqueous electrolyte secondary battery capable of preventing the separator from being damaged when the sealing member is joined to the battery case by laser welding.

本発明の解決しようとする課題は以上の如くであり、次にこの課題を解決するための手段を説明する。   The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

即ち、請求項１においては、電池ケースの内部に電極体が収容され、前記電池ケースの開口部に封口体をレーザ溶接により接合することで、前記電池ケースの開口部を封口する非水電解質二次電池であって、前記電極体は、セパレータと、電極芯材に電極合材が塗工された電極とを積層し、積層した電極とセパレータとを捲回して構成した捲回電極体であり、前記捲回電極体の軸方向と、前記封口体による前記電池ケースの開口部の封口方向とが直交するように、前記電池ケースに収容され、前記電極体の最外周の電極における封口体側のＲ部にのみ、外周側にのみ前記電極合材が塗工されない無塗工部が形成されるものである。 That is, according to the first aspect of the present invention, the electrode body is accommodated in the battery case, and the sealing body is joined to the opening portion of the battery case by laser welding, thereby sealing the opening portion of the battery case. In the secondary battery, the electrode body is a wound electrode body formed by laminating a separator and an electrode in which an electrode mixture is applied to an electrode core, and winding the laminated electrode and the separator. The axial direction of the wound electrode body and the sealing body are accommodated in the battery case so that the sealing direction of the opening of the battery case by the sealing body is orthogonal to the sealing body side of the outermost electrode of the electrode body. Only the R part is formed with an uncoated part where the electrode mixture is not applied only on the outer peripheral side.

本発明の非水電解質二次電池によれば、封口体を電池ケースの開口部にレーザ溶接によって接合する際のセパレータの損傷を防止できる。   According to the nonaqueous electrolyte secondary battery of the present invention, it is possible to prevent damage to the separator when the sealing body is joined to the opening of the battery case by laser welding.

本発明の実施形態に係るリチウムイオン二次電池の構成を示した斜視図。The perspective view which showed the structure of the lithium ion secondary battery which concerns on embodiment of this invention. 同じくリチウムイオン二次電池の構成を示した一部断面側面図。The partial cross section side view which showed the structure of the lithium ion secondary battery similarly. 同じくリチウムイオン二次電池の製造工程の流れを示した模式図。The schematic diagram which showed the flow of the manufacturing process of a lithium ion secondary battery similarly. 同じくリチウムイオン二次電池の効果を示す模式図。The schematic diagram which similarly shows the effect of a lithium ion secondary battery.

図１を用いて、リチウムイオン二次電池１００について説明する。
なお、図１では、説明を分かり易くするため、電池ケース４０と、捲回電極体５０と、蓋体６０と、を分離して表している。 A lithium ion secondary battery 100 will be described with reference to FIG.
In FIG. 1, the battery case 40, the wound electrode body 50, and the lid body 60 are shown separately for easy understanding.

リチウムイオン二次電池１００は、本発明の非水電解質二次電池に係る実施形態である。リチウムイオン二次電池１００は、電池ケース４０と、捲回電極体５０と、封口体としての蓋体６０と、を具備している。   The lithium ion secondary battery 100 is an embodiment according to the nonaqueous electrolyte secondary battery of the present invention. The lithium ion secondary battery 100 includes a battery case 40, a wound electrode body 50, and a lid body 60 as a sealing body.

電池ケース４０は、上面が開口された略直方体の箱体として構成されている。電池ケース４０の開口された上面は、蓋体６０によって封口される。また、電池ケース４０の内部には、捲回電極体５０が収容される。   The battery case 40 is configured as a substantially rectangular parallelepiped box having an upper surface opened. The opened upper surface of the battery case 40 is sealed by the lid body 60. A wound electrode body 50 is accommodated in the battery case 40.

捲回電極体５０は、負極２０と正極１０との間にセパレータ３０が介在するように、負極２０と正極１０とセパレータ３０とを積層した状態で捲回し、さらに偏平させたものである（図２参照）。本実施形態においては、捲回電極体５０の最外周に配置される電極は負極２０となっており、最外周の負極２０の外周にセパレータ３０が配置されている。   The wound electrode body 50 is wound and further flattened in a state in which the negative electrode 20, the positive electrode 10, and the separator 30 are laminated so that the separator 30 is interposed between the negative electrode 20 and the positive electrode 10. 2). In the present embodiment, the electrode disposed on the outermost periphery of the wound electrode body 50 is the negative electrode 20, and the separator 30 is disposed on the outer periphery of the outermost negative electrode 20.

捲回電極体５０は、捲回電極体５０の軸方向と蓋体６０による電池ケース４０の開口部の封口方向とが直交するように電池ケース４０に収容される。なお、図１において、捲回電極体５０の軸方向はＡ方向であり、蓋体６０による電池ケース４０の開口部の封口方向はＢ方向である。   The wound electrode body 50 is accommodated in the battery case 40 so that the axial direction of the wound electrode body 50 and the sealing direction of the opening of the battery case 40 by the lid body 60 are orthogonal to each other. In FIG. 1, the axial direction of the wound electrode body 50 is the A direction, and the sealing direction of the opening of the battery case 40 by the lid body 60 is the B direction.

捲回電極体５０の軸方向一側の端部には、正極集電体５１（後述する正極芯材１１のみが捲かれたもの）が露出している。一方、捲回電極体５０の軸方向他側の端部には、負極集電体５２（後述する負極芯材２１のみが捲かれたもの）が露出している。   A positive electrode current collector 51 (only a positive electrode core member 11 to be described later is wound) is exposed at an end portion on one side in the axial direction of the wound electrode body 50. On the other hand, the negative electrode current collector 52 (only the negative electrode core material 21 described later is wound) is exposed at the end of the wound electrode body 50 on the other side in the axial direction.

捲回電極体５０は、略直方体の箱体として構成される電池ケース４０に収容されるため、円筒形状の捲回体を偏平して構成されている。より具体的には、捲回電極体５０は、最外周のセパレータ３０が曲線を形成するＲ部５０Ａと、最外周が直線を形成するストレート部５０Ｂと、から構成される。   Since the wound electrode body 50 is accommodated in the battery case 40 configured as a substantially rectangular parallelepiped box, the wound body is formed in a flat shape. More specifically, the wound electrode body 50 includes an R portion 50A in which the outermost separator 30 forms a curve, and a straight portion 50B in which the outermost periphery forms a straight line.

また、捲回電極体５０は、Ｒ部５０Ａとストレート部５０Ｂとを有する長円形状の長軸方向が蓋体６０の封口方向と平行となるように、電池ケース４０内に収容されている。なお、捲回電極体５０について、さらに詳細な説明は後述する。   The wound electrode body 50 is housed in the battery case 40 so that the major axis direction of the ellipse having the R portion 50A and the straight portion 50B is parallel to the sealing direction of the lid body 60. A more detailed description of the wound electrode body 50 will be described later.

蓋体６０は、電池ケース４０の上面を封口するものである。より詳しくは、蓋体６０は、電池ケース４０の上面にレーザ溶接によって接合されることで、電池ケース４０の上面を封口するものである。すなわち、リチウムイオン二次電池１００においては、電池ケース４０の開口部に蓋体６０をレーザ溶接により接合することで、電池ケース４０の開口部が封口される。   The lid 60 seals the upper surface of the battery case 40. More specifically, the lid 60 seals the upper surface of the battery case 40 by being joined to the upper surface of the battery case 40 by laser welding. That is, in the lithium ion secondary battery 100, the opening of the battery case 40 is sealed by joining the lid 60 to the opening of the battery case 40 by laser welding.

蓋体６０の上面には、正極集電端子６１と、負極集電端子６２と、が設けられている。正極集電端子６１には、下方に延設される脚部７１が形成されている。同様に、負極集電端子６２には、下方に延設される脚部７２が形成されている。   A positive electrode current collector terminal 61 and a negative electrode current collector terminal 62 are provided on the upper surface of the lid 60. The positive current collecting terminal 61 is formed with a leg portion 71 extending downward. Similarly, the negative electrode current collecting terminal 62 is formed with a leg portion 72 extending downward.

捲回電極体５０が電池ケース４０に収容されるときには、正極集電端子６１の脚部７１に、捲回電極体５０の正極集電体５１が接合される。同様に、捲回電極体５０が電池ケース４０に収容されるときには、負極集電端子６２の脚部７２に、捲回電極体５０の負極集電体５２が接合される。つまり、捲回電極体５０は、正極集電端子６１及び負極集電端子６２を備えた蓋体６０と接合された状態で、電池ケース４０に収容される。   When the wound electrode body 50 is accommodated in the battery case 40, the positive electrode current collector 51 of the wound electrode body 50 is joined to the leg portion 71 of the positive electrode current collector terminal 61. Similarly, when the wound electrode body 50 is housed in the battery case 40, the negative electrode current collector 52 of the wound electrode body 50 is joined to the leg portion 72 of the negative electrode current collector terminal 62. That is, the wound electrode body 50 is accommodated in the battery case 40 in a state where the wound electrode body 50 is joined to the lid body 60 including the positive electrode current collector terminal 61 and the negative electrode current collector terminal 62.

図２を用いて、捲回電極体５０について説明する。
なお、図２では、リチウムイオン二次電池１００の中央部を軸方向に垂直な側面断面視にて表し、左上部に捲回電極体５０の最外周部分を拡大した図にて表している。 The wound electrode body 50 will be described with reference to FIG.
In FIG. 2, the central portion of the lithium ion secondary battery 100 is shown in a side sectional view perpendicular to the axial direction, and the outermost peripheral portion of the wound electrode body 50 is shown in an enlarged view in the upper left portion.

積層状態の正極１０、負極２０、及びセパレータ３０を捲回し、扁平して構成した捲回電極体５０においては、最外周から中央側に向かって、セパレータ３０、負極２０、セパレータ３０、正極１０、セパレータ３０、・・の順で積層されている。正極１０は、電極芯材としての正極芯材１１の両面（上面及び下面）に電極合材としての正極合材１２が塗工されている。負極２０は、電極芯材としての負極芯材２１の両面（上面及び下面）に電極合材としての負極合材２２が塗工されている。   In the wound electrode body 50 formed by winding and flattening the stacked positive electrode 10, negative electrode 20, and separator 30, the separator 30, negative electrode 20, separator 30, positive electrode 10, The separators 30 are stacked in this order. In the positive electrode 10, a positive electrode mixture 12 as an electrode mixture is coated on both surfaces (upper surface and lower surface) of a positive electrode core material 11 as an electrode core material. In the negative electrode 20, a negative electrode mixture 22 as an electrode mixture is coated on both surfaces (upper surface and lower surface) of a negative electrode core material 21 as an electrode core material.

ここで、特記すべき事項として、捲回電極体５０の最外周の負極２０における蓋体６０側（封口体側）の外側には、負極合材２２が塗工されない無塗工部Ｓが形成されている。より詳しくは、捲回電極体５０の最外周の負極２０における蓋体６０側（封口体側）のＲ部５０Ａの外周側には、負極合材２２が塗工されない無塗工部Ｓが形成されている。   Here, as a matter of special mention, an uncoated portion S to which the negative electrode mixture 22 is not applied is formed on the outer side of the outermost negative electrode 20 of the wound electrode body 50 on the lid body 60 side (sealing body side). ing. More specifically, an uncoated portion S to which the negative electrode mixture 22 is not applied is formed on the outer peripheral side of the R portion 50A on the lid body 60 side (sealing body side) of the negative electrode 20 at the outermost periphery of the wound electrode body 50. ing.

図３を用いて、リチウムイオン二次電池１００の製造工程Ｓ１００について、説明する。
なお、図３では、リチウムイオン二次電池１００の製造工程Ｓ１００の流れを模式的に表している。 The manufacturing process S100 of the lithium ion secondary battery 100 will be described with reference to FIG.
In FIG. 3, the flow of the manufacturing process S100 of the lithium ion secondary battery 100 is schematically shown.

リチウムイオン二次電池１００の製造工程Ｓ１００は、リチウムイオン二次電池１００を製造する工程である。なお、本実施形態では、前提として、電池ケース４０と、捲回電極体５０と、蓋体６０とが既に部品として組み立てられた段階での製造工程としている。   The manufacturing process S100 of the lithium ion secondary battery 100 is a process of manufacturing the lithium ion secondary battery 100. In the present embodiment, as a premise, the manufacturing process is performed when the battery case 40, the wound electrode body 50, and the lid body 60 are already assembled as components.

ステップＳ１１０では、蓋体６０に捲回電極体５０が接合される。より詳しくは、蓋体６０の脚部７１・７２に捲回電極体５０の正極集電体５１及び負極集電体５２が溶接によってそれぞれ接合される。   In step S <b> 110, the wound electrode body 50 is joined to the lid body 60. More specifically, the positive electrode current collector 51 and the negative electrode current collector 52 of the wound electrode body 50 are joined to the legs 71 and 72 of the lid 60 by welding, respectively.

ステップＳ１２０では、捲回電極体５０が接合された蓋体６０によって、電池ケース４０の開口部が閉塞される。言い換えれば、捲回電極体５０が電池ケース４０に収容され、同時に蓋体６０によって電池ケース４０の開口部が閉塞される。
ステップＳ１３０では、電池ケース４０の開口部を閉塞する蓋体６０と電池ケース４０とをレーザ溶接によって接合し、蓋体６０により電池ケース４０の開口部を封口する。 In step S120, the opening of the battery case 40 is closed by the lid body 60 to which the wound electrode body 50 is bonded. In other words, the wound electrode body 50 is accommodated in the battery case 40, and at the same time, the opening of the battery case 40 is closed by the lid body 60.
In step S <b> 130, the lid 60 that closes the opening of the battery case 40 and the battery case 40 are joined by laser welding, and the opening of the battery case 40 is sealed by the lid 60.

図４を用いて、リチウムイオン二次電池１００の効果について説明する。
なお、図４（Ａ）は、従来の捲回電極体１５０の電極合材が塗工された面の最外周部分を軸方向に垂直な断面視にて表している。一方、図４（Ｂ）は、本実施形態の捲回電極体５０の最外周部分を断面視にて表している The effect of the lithium ion secondary battery 100 will be described with reference to FIG.
4A shows the outermost peripheral portion of the surface of the conventional wound electrode body 150 on which the electrode mixture is coated, in a cross-sectional view perpendicular to the axial direction. On the other hand, FIG. 4B shows the outermost peripheral portion of the wound electrode body 50 of the present embodiment in a sectional view.

上述したリチウムイオン二次電池１００の製造工程Ｓ１００では、ステップＳ１３０において、電池ケース４０の開口部に蓋体６０をレーザ溶接により接合することで、電池ケース４０の開口部を封口する。このとき、電池ケース４０の開口部に配置した蓋体６０と電池ケース４０との隙間からレーザ光線が電池ケース４０内部に漏れて入り込み、捲回電極体５０の最外周を照射する場合がある。   In the manufacturing process S100 of the lithium ion secondary battery 100 described above, in step S130, the opening of the battery case 40 is sealed by joining the lid 60 to the opening of the battery case 40 by laser welding. At this time, the laser beam may leak into the battery case 40 from the gap between the lid 60 and the battery case 40 disposed in the opening of the battery case 40 and irradiate the outermost periphery of the wound electrode body 50.

従来、捲回電極体１５０の最外周にレーザ光線が照射された場合には、レーザ光線がセパレータ３０を透過し、負極２０に塗工された負極合材２２によって吸収されていた。レーザ光線を吸収した負極合材２２は、発熱し、その発熱によって周囲のセパレータ３０が損傷されていた。セパレータ３０が損傷した部分では、正極１０と負極２０とが接触して内部短絡が発生するおそれがあった。   Conventionally, when a laser beam is applied to the outermost periphery of the wound electrode body 150, the laser beam passes through the separator 30 and is absorbed by the negative electrode mixture 22 applied to the negative electrode 20. The negative electrode mixture 22 that absorbed the laser beam generated heat, and the surrounding separator 30 was damaged by the heat generation. In the part where the separator 30 is damaged, the positive electrode 10 and the negative electrode 20 may come into contact with each other and an internal short circuit may occur.

本実施形態のリチウムイオン二次電池１００によれば、蓋体６０をレーザ溶接によって電池ケース４０の開口部に接合する際のセパレータ３０の損傷を防止できる。すなわち、捲回電極体１５０の最外周にレーザ光線が照射された場合には、レーザ光線がセパレータ３０を透過するものの、負極２０には無塗工部Ｓが形成されているため、照射されたレーザ光線が負極芯材２１によって反射される。そのため、負極合材２２が発熱して周囲のセパレータ３０が損傷されることはない。   According to the lithium ion secondary battery 100 of the present embodiment, it is possible to prevent the separator 30 from being damaged when the lid 60 is joined to the opening of the battery case 40 by laser welding. That is, when the laser beam is irradiated on the outermost periphery of the wound electrode body 150, the laser beam passes through the separator 30, but the negative electrode 20 is irradiated with the non-coated portion S. The laser beam is reflected by the negative electrode core material 21. Therefore, the negative electrode mixture 22 does not generate heat and the surrounding separator 30 is not damaged.

本実施形態では、電極体を、積層状態の正極１０、負極２０、及びセパレータ３０を捲回して偏平させた構成の捲回電極体５０としたが、これに限定されない。例えば、電極体を、正極１０、負極２０、及びセパレータ３０を積層して構成した積層電極体としても本実施形態と同様の効果が得られる。なお、このときは、最上層の電極（正極１０または負極２０）の外周側（上側）に無塗工部Ｓが形成される。   In the present embodiment, the electrode body is the wound electrode body 50 having a configuration in which the stacked positive electrode 10, negative electrode 20, and separator 30 are wound and flattened, but is not limited thereto. For example, an effect similar to that of the present embodiment can be obtained even when the electrode body is a laminated electrode body formed by laminating the positive electrode 10, the negative electrode 20, and the separator 30. At this time, the uncoated portion S is formed on the outer peripheral side (upper side) of the uppermost electrode (positive electrode 10 or negative electrode 20).

本実施形態では、積層状態の正極１０、負極２０、及びセパレータ３０を捲回し、扁平して構成した捲回電極体５０を、最外周から中央に向かって、セパレータ３０、負極２０、セパレータ３０、正極１０、セパレータ３０、・・の順で積層されている構成としたが、これに限定されない。例えば、積層状態の正極１０、負極２０、及びセパレータ３０を捲回し、扁平して構成した捲回電極体５０を、最外周から中央に向かって、セパレータ３０、正極１０、セパレータ３０、負極２０、セパレータ３０、・・の順で積層されている構成としても本実施形態と同様の作用効果が得られる。   In the present embodiment, the wound positive electrode 10, the negative electrode 20, and the separator 30 in a stacked state are wound and flattened to form a wound electrode body 50 from the outermost periphery toward the center, the separator 30, the negative electrode 20, the separator 30, Although it is set as the structure laminated | stacked in order of the positive electrode 10, the separator 30, and ..., it is not limited to this. For example, the stacked positive electrode 10, the negative electrode 20, and the separator 30 are wound and flattened to form a wound electrode body 50 from the outermost periphery toward the center, the separator 30, the positive electrode 10, the separator 30, the negative electrode 20, Even when the separators 30 are stacked in this order, the same effects as the present embodiment can be obtained.

１０ 正極
１１ 正極芯材
１２ 正極合材
２０ 負極
２１ 負極芯材
２２ 負極合材
３０ セパレータ
４０ 電池ケース
５０ 捲回電極体
６０ 蓋体
１００ リチウムイオン二次電池
DESCRIPTION OF SYMBOLS 10 Positive electrode 11 Positive electrode core material 12 Positive electrode compound material 20 Negative electrode 21 Negative electrode core material 22 Negative electrode compound material 30 Separator 40 Battery case 50 Winding electrode body 60 Lid body 100 Lithium ion secondary battery

Claims (1)

電池ケースの内部に電極体が収容され、前記電池ケースの開口部に封口体をレーザ溶接により接合することで、前記電池ケースの開口部を封口する非水電解質二次電池であって、
前記電極体は、セパレータと、電極芯材に電極合材が塗工された電極とを積層し、積層した電極とセパレータとを捲回して構成した捲回電極体であり、
前記捲回電極体の軸方向と、前記封口体による前記電池ケースの開口部の封口方向とが直交するように、前記電池ケースに収容され、
前記電極体の最外周の電極における封口体側のＲ部にのみ、外周側にのみ前記電極合材が塗工されない無塗工部が形成される、
非水電解質二次電池。 An electrode body is housed inside the battery case, and a non-aqueous electrolyte secondary battery that seals the opening of the battery case by joining a sealing body to the opening of the battery case by laser welding,
The electrode body is a wound electrode body formed by laminating a separator and an electrode coated with an electrode mixture on an electrode core, and winding the laminated electrode and the separator,
The axial direction of the wound electrode body is accommodated in the battery case so that the sealing direction of the opening of the battery case by the sealing body is orthogonal,
Only the R part on the sealing body side of the electrode on the outermost periphery of the electrode body is formed with an uncoated part where the electrode mixture is not applied only on the outer peripheral side,
Non-aqueous electrolyte secondary battery.
JP2012104173A 2012-04-27 2012-04-27 Nonaqueous electrolyte secondary battery Active JP5692154B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2012104173A JP5692154B2 (en) 2012-04-27 2012-04-27 Nonaqueous electrolyte secondary battery

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2012104173A JP5692154B2 (en) 2012-04-27 2012-04-27 Nonaqueous electrolyte secondary battery

Publications (2)

Publication Number Publication Date
JP2013232354A JP2013232354A (en) 2013-11-14
JP5692154B2 true JP5692154B2 (en) 2015-04-01

Family

ID=49678621

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2012104173A Active JP5692154B2 (en) 2012-04-27 2012-04-27 Nonaqueous electrolyte secondary battery

Country Status (1)

Country Link
JP (1) JP5692154B2 (en)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10261429A (en) * 1997-03-18 1998-09-29 Japan Storage Battery Co Ltd Battery
JPH11167929A (en) * 1997-12-04 1999-06-22 Gs Merukotec Kk Square battery
JP3428448B2 (en) * 1998-08-21 2003-07-22 三菱電機株式会社 Electrode structure and battery using the same
JP2001143763A (en) * 1999-11-18 2001-05-25 Toshiba Battery Co Ltd Flat non-aqueous electrolyte secondary battery
JP5103496B2 (en) * 2010-03-09 2012-12-19 日立ビークルエナジー株式会社 Lithium ion secondary battery

Also Published As

Publication number Publication date
JP2013232354A (en) 2013-11-14

Similar Documents

Publication Publication Date Title
JP5803713B2 (en) Power storage device and vehicle
JP6657843B2 (en) Rechargeable battery
JP6522418B2 (en) Rectangular secondary battery, battery assembly using the same, and method of manufacturing the same
JP2015099681A (en) Sealed battery
JP2017010743A (en) Secondary battery and assembled battery using the same
JP2016178025A (en) Power storage element
JP2018010815A (en) Power storage element and method for manufacturing power storage element
JP2016085875A (en) Power storage device, power-supply module, and method for manufacturing power storage device
JPWO2019044633A1 (en) Power storage element and power storage device
WO2018062231A1 (en) Square-shaped secondary battery
JP2015002147A (en) Sealed battery and method of manufacturing the same
JP2013168253A (en) Wound battery
JP2013143332A (en) Battery
JP2016103412A (en) Square secondary battery
JP2018101568A (en) Square secondary battery and manufacturing method thereof
JP2013214409A (en) Wound battery
WO2018012465A1 (en) Power storage element and power storage element production method
JP6089832B2 (en) Electricity storage element
JP5692154B2 (en) Nonaqueous electrolyte secondary battery
JP5514618B2 (en) Secondary battery
JP2014182899A (en) Power storage element and method for manufacturing power storage element
JP6304981B2 (en) Nonaqueous electrolyte secondary battery
JP2018101569A (en) Square secondary battery and manufacturing method thereof
JP2012169152A (en) Nonaqueous electrolyte secondary battery
JP2019121457A (en) Manufacturing method of power storage device, and power storage device

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20140213

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20140729

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20140805

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20140929

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20141021

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20141204

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: 20150106

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20150119

R151 Written notification of patent or utility model registration

Ref document number: 5692154

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R151