JP2015176701A - Power storage device and method for manufacturing power storage device - Google Patents
Power storage device and method for manufacturing power storage device Download PDFInfo
- Publication number
- JP2015176701A JP2015176701A JP2014051455A JP2014051455A JP2015176701A JP 2015176701 A JP2015176701 A JP 2015176701A JP 2014051455 A JP2014051455 A JP 2014051455A JP 2014051455 A JP2014051455 A JP 2014051455A JP 2015176701 A JP2015176701 A JP 2015176701A
- Authority
- JP
- Japan
- Prior art keywords
- positive electrode
- welding
- negative electrode
- tab
- electrode tab
- 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.)
- Pending
Links
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
- Y02E60/13—Energy storage using capacitors
Landscapes
- Electric Double-Layer Capacitors Or The Like (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
Description
本発明は、蓄電装置及び蓄電装置の製造方法に関する。 The present invention relates to a power storage device and a method for manufacturing the power storage device.
二次電池やキャパシタのような蓄電装置は再充電が可能であり、繰り返し使用することができるため電源として広く利用されている。一般に、容量の大きな蓄電装置は電極組立体を収容するケースを備え、そのケース内に電極組立体が収容されている。そして、蓄電装置からの電力の取り出しは、電極組立体の正極及び負極に接続された電極端子を通して行われている。 Power storage devices such as secondary batteries and capacitors are widely used as power sources because they can be recharged and can be used repeatedly. In general, a power storage device with a large capacity includes a case for accommodating an electrode assembly, and the electrode assembly is accommodated in the case. And extraction of the electric power from an electrical storage apparatus is performed through the electrode terminal connected to the positive electrode and negative electrode of an electrode assembly.
電極組立体には、例えば、複数の正極と複数の負極との間にセパレータを介在させた状態で積層した積層型の電極組立体がある。正極及び負極は、それぞれ複数枚のタブと呼ばれる金属箔の部分を有し、複数枚のタブが導電部材を介して正極端子あるいは負極端子に積層された状態で溶接されている。溶接方法としては、スポット溶接やレーザー溶接が用いられている。 As the electrode assembly, for example, there is a stacked electrode assembly in which separators are interposed between a plurality of positive electrodes and a plurality of negative electrodes. Each of the positive electrode and the negative electrode has a plurality of metal foil portions called tabs, and the plurality of tabs are welded in a state of being stacked on the positive electrode terminal or the negative electrode terminal via a conductive member. Spot welding or laser welding is used as a welding method.
ところで、二次電池の大容量化のニーズにより、タブの積層枚数が増える傾向にある。タブの積層枚数が増えるとスポット溶接の場合、溶接プローブ（チップ）への負荷が大きくなり、溶接プローブの交換回数が増え、ランニングコストが上昇する。また、レーザー溶接の場合、積層枚数が多い状態のタブに対して積層方向にレーザーを照射した状態で照射位置を移動させると、上側（一端側）のタブが焼き切れる場合がある。上側のタブが焼き切れないようにレーザーの出力を低くすると、積層方向の他端側まで十分にタブが溶けず、一部で導通の不良が生じる。 By the way, the number of stacked tabs tends to increase due to the need for a large capacity secondary battery. When the number of stacked tabs is increased, in the case of spot welding, the load on the welding probe (tip) is increased, the number of replacement of the welding probe is increased, and the running cost is increased. Further, in the case of laser welding, when the irradiation position is moved in a state where the laser is irradiated in the stacking direction with respect to the tab having a large number of stacked layers, the upper (one end side) tab may be burned out. If the laser output is lowered so that the upper tab is not burnt out, the tab does not melt sufficiently to the other end side in the stacking direction, and conduction failure occurs in part.
この解決策として、積層されたタブ（芯体露出部）の端部が傾斜面を有するようにして、レーザー照射する方法が提案されている（例えば、特許文献１参照）。この溶接方法では、図９（ａ）に示すように、電極６１のタブ６２の端部６２ａが傾斜面となるように積層されて導電部材６３の表面上に載置され、上方からレーザー光ＬＢが照射されてレーザー溶接が行われる。このレーザー光ＬＢの照射は、積層されたタブ６２の端部６２ａの傾斜面の上方となる側（図９（ａ）における左側）から下方となる側（図９（ａ）における右側）に向けて走査するように行われ、レーザー光ＬＢが照射される位置には同時にアルゴンガスや窒素ガス等が吹き付けられる。そして、図９（ｂ）に示すように、積層されたタブ６２の端部６２ａ側の溶融部分６４は、積層されたタブ６２の端部６２ａの傾斜面に沿って、導電部材６３の溶融部分６４ａまで連続的に形成される。 As a solution to this problem, there has been proposed a method of irradiating a laser so that the end portions of the stacked tabs (core body exposed portions) have inclined surfaces (see, for example, Patent Document 1). In this welding method, as shown in FIG. 9A, the end 62a of the tab 62 of the electrode 61 is laminated so as to be an inclined surface and placed on the surface of the conductive member 63, and the laser beam LB from above. Is irradiated and laser welding is performed. The irradiation with the laser beam LB is directed from the upper side (left side in FIG. 9A) to the lower side (right side in FIG. 9A) of the inclined surface of the end 62a of the stacked tabs 62. At the same time, argon gas, nitrogen gas, or the like is sprayed onto the position where the laser beam LB is irradiated. 9B, the melted portion 64 on the end 62a side of the stacked tab 62 is a melted portion of the conductive member 63 along the inclined surface of the end 62a of the stacked tab 62. It is continuously formed up to 64a.
ところで、溶接時の課題として、活物質やセパレータに対する熱影響がある。特許文献１には、タブの先端を傾斜面とし、レーザー光を照射しながら、タブの根元より先端方向に移動させることが記載されている。特許文献１には断面図のみ記載されているが、電池内部での抵抗を下げるためには、十分な溶接面積が必要であり、タブの幅方向に、溶接部を広げる必要がある。しかしながら、このように溶接部を設定すると、タブの受熱量が増え、熱が活物質層やセパレータに伝わり、活物質やセパレータを変質させる虞がある。 By the way, as a problem at the time of welding, there is a thermal influence on the active material and the separator. Patent Document 1 describes that the tip of the tab is inclined and moved from the root of the tab toward the tip while irradiating laser light. Although only a cross-sectional view is described in Patent Document 1, in order to reduce the resistance inside the battery, a sufficient welding area is necessary, and it is necessary to widen the welded portion in the width direction of the tab. However, when the welded portion is set in this manner, the amount of heat received by the tab increases, and heat is transmitted to the active material layer and the separator, which may cause the active material and the separator to be altered.
本発明は、前記の問題に鑑みてなされたものであって、その目的は、電極の複数枚の正極タブあるいは負極タブを導電部材に対し複数枚積層した状態で溶接するタブの溶接工程において、溶接箇所で発生する熱が、タブを介して活物質層やセパレータに伝わる量を抑制することができる蓄電装置及び蓄電装置の製造方法を提供することにある。 The present invention has been made in view of the above problems, and its purpose is to weld a tab in which a plurality of positive electrode tabs or negative electrode tabs of an electrode are welded in a state of being laminated on a conductive member. An object of the present invention is to provide a power storage device and a method for manufacturing the power storage device that can suppress the amount of heat generated at a welding location that is transmitted to an active material layer or a separator via a tab.
上記課題を解決する蓄電装置は、正極及び負極が絶縁された層状の構造を成し、前記正極及び前記負極はそれぞれ複数枚の正極タブ及び負極タブが導電部材を介して電極端子と電気的に接続された電極組立体を備える蓄電装置であって、前記正極タブ及び前記負極タブは、先端部が傾斜面を形成するように積層され、複数の溶接部の少なくとも一部の溶接部が前記正極タブ及び前記負極タブの延びる方向と交差する方向に延びる状態で前記導電部材に溶接されている。 A power storage device that solves the above problems has a layered structure in which a positive electrode and a negative electrode are insulated, and the positive electrode and the negative electrode are electrically connected to an electrode terminal through a conductive member. A power storage device including a connected electrode assembly, wherein the positive electrode tab and the negative electrode tab are stacked so that tip portions form an inclined surface, and at least some of the welds of the plurality of welds are the positive electrode The conductive member is welded in a state extending in a direction intersecting with a direction in which the tab and the negative electrode tab extend.
この構成によれば、電極組立体を構成する正極タブあるいは負極タブと導電部材とを溶着する溶接部は複数設けられている。そして、複数の溶接部のうち少なくとも一部の溶接部は、先端部が傾斜面を形成するように積層された正極タブあるいは負極タブの延びる方向と交差する方向に延びる状態で設けられている。また、積層された正極タブあるいは負極タブは、それぞれ全ての正極タブあるいは負極タブと導電部材とが共通の溶接部で溶着されているのではなく、例えば、数枚ずつ別の溶接部で溶着されている。そのため、例えば、レーザー溶接で溶接を行う場合、積層された正極タブあるいは負極タブと導電部材、積層された正極タブあるいは負極タブ同士の溶接部の溶接面積を確保するために必要なレーザー光の走査回数は、レーザー光の走査をタブの根元（基端）側から先端方向に向かって行う場合に比べて、１回に照射されるレーザーの出力を下げても少なくなる。したがって、電極の複数枚の正極タブあるいは負極タブを導電部材に対し複数枚積層した状態で溶接するタブの溶接工程において、溶接箇所で発生する熱が、タブを介して活物質層やセパレータに伝わる量を抑制することができる。 According to this configuration, a plurality of welds for welding the positive electrode tab or the negative electrode tab constituting the electrode assembly and the conductive member are provided. And at least one part among several welding parts is provided in the state extended in the direction which cross | intersects the extending direction of the positive electrode tab or negative electrode tab laminated | stacked so that a front-end | tip part may form an inclined surface. In addition, in the laminated positive electrode tab or negative electrode tab, not all the positive electrode tabs or negative electrode tabs and the conductive member are welded in a common welded part, for example, several sheets are welded in separate welded parts. ing. Therefore, for example, when welding is performed by laser welding, scanning of laser light necessary to secure the weld area of the welded portion of the stacked positive electrode tab or negative electrode tab and the conductive member, and the stacked positive electrode tab or negative electrode tabs. The number of times is reduced even when the output of the laser irradiated at one time is lowered as compared with the case where the scanning of the laser beam is performed from the base (base end) side of the tab toward the distal end. Therefore, in the welding process of the tab that is welded in a state where a plurality of positive electrode tabs or negative electrode tabs of the electrode are stacked on the conductive member, heat generated at the welding point is transmitted to the active material layer and the separator via the tabs. The amount can be suppressed.
前記正極タブあるいは負極タブは、それぞれ前記溶接部より前記正極側あるいは負極側においてカシメ部材を介して前記導電部材に固定されていることが好ましい。先端部が傾斜面を形成するように積層された状態で導電部材と電気的に接続されている正極タブあるいは負極タブのうち、傾斜面の先端側に位置する正極タブあるいは負極タブが導電部材と溶着されているため、タブ全体に力が加わった場合、タブと導電部材との溶着部に応力集中が生じ易い。しかし、正極タブあるいは負極タブは、それぞれ溶接部より正極側あるいは負極側においてカシメ部材を介して導電部材に固定されているため、正極タブあるいは負極タブと導電部材との溶着部に応力集中が生じ難くなる。 The positive electrode tab or the negative electrode tab is preferably fixed to the conductive member via a caulking member on the positive electrode side or the negative electrode side from the welded portion. Of the positive electrode tab or the negative electrode tab that is electrically connected to the conductive member in a state where the tip portion is laminated so as to form an inclined surface, the positive electrode tab or the negative electrode tab that is located on the tip side of the inclined surface is the conductive member. Since it is welded, when force is applied to the entire tab, stress concentration tends to occur at the welded portion between the tab and the conductive member. However, since the positive electrode tab or the negative electrode tab is fixed to the conductive member via the caulking member on the positive electrode side or the negative electrode side from the welded portion, stress concentration occurs in the welded portion between the positive electrode tab or the negative electrode tab and the conductive member. It becomes difficult.
上記課題を解決する蓄電装置の製造方法は、正極及び負極が絶縁された層状の構造を成し、前記正極及び前記負極はそれぞれ複数枚の正極タブあるいは負極タブが導電部材を介して電極端子と電気的に接続された電極組立体を備える蓄電装置の製造方法である。そして、前記正極タブあるいは前記負極タブを、それぞれ先端部が傾斜面を形成するように積層した状態で、溶接部が前記正極タブあるいは前記負極タブの延びる方向と交差する方向に延びる状態となるように、前記正極タブと前記導電部材あるいは前記負極タブと前記導電部材を、溶接部を連続的に形成可能な溶接手段に対してそれぞれ複数回相対移動させて、前記導電部材に対して溶接を行うタブ溶接工程を備える。 A manufacturing method of a power storage device that solves the above problems has a layered structure in which a positive electrode and a negative electrode are insulated, and each of the positive electrode and the negative electrode has a plurality of positive electrode tabs or negative electrode tabs connected to electrode terminals via conductive members. It is a manufacturing method of an electrical storage apparatus provided with the electrode assembly electrically connected. Then, in a state where the positive electrode tab or the negative electrode tab are laminated so that the tip portions form inclined surfaces, the welded portion extends in a direction intersecting with the extending direction of the positive electrode tab or the negative electrode tab. Further, the positive electrode tab and the conductive member or the negative electrode tab and the conductive member are moved relative to each other by a plurality of times with respect to welding means capable of continuously forming a welded portion, and welding is performed on the conductive member. A tab welding process is provided.
この構成によれば、タブ溶接工程において、正極タブあるいは負極タブをそれぞれ先端部が傾斜面を形成するように積層した状態で、溶接部がタブの延びる方向と交差する方向に延びる状態となるように、正極タブあるいは負極タブと導電部材を溶接手段に対してそれぞれ複数回相対移動させて、導電部材に対して溶接を行う。そのため、例えば、レーザー溶接で溶接を行う場合、積層された正極タブあるいは負極タブと導電部材あるいは積層されたタブ同士の溶接部の溶接面積を確保するために必要なレーザー光の走査回数は、レーザー光の走査をタブの根元（基端）側から先端方向に向かって行う場合に比べて、１回に照射されるレーザーの出力を下げても少なくなる。したがって、電極の複数枚の正極タブあるいは負極タブを導電部材に対し複数枚積層した状態で溶接するタブの溶接工程において、溶接箇所で発生する熱が、タブを介して活物質層やセパレータに伝わる量を抑制することができる。 According to this configuration, in the tab welding process, the positive electrode tab or the negative electrode tab is stacked such that the tip portion forms an inclined surface, and the welded portion extends in a direction intersecting with the extending direction of the tab. In addition, the positive electrode tab or the negative electrode tab and the conductive member are respectively moved relative to the welding means a plurality of times to weld the conductive member. Therefore, for example, when performing welding by laser welding, the number of scans of laser light necessary to secure the weld area of the welded portion of the laminated positive electrode tab or negative electrode tab and the conductive member or the laminated tabs is Compared to the case where light scanning is performed from the base (base end) side of the tab toward the distal end, the output of the laser irradiated at one time is reduced. Therefore, in the welding process of the tab that is welded in a state where a plurality of positive electrode tabs or negative electrode tabs of the electrode are stacked on the conductive member, heat generated at the welding point is transmitted to the active material layer and the separator via the tabs. The amount can be suppressed.
前記溶接手段による溶接は、前記正極タブあるいは前記負極タブの階段状の部分の先端側と前記導電部材との溶接を最初に行い、その後、溶接箇所を順次前記階段状の部分の基端側に変更して溶接を行うことが好ましい。この構成によれば、先ず、一部の正極タブあるいは負極タブと導電部材とが溶接された後、導電部材に近い正極タブ同士あるいは負極タブ同士が順に溶接される。そのため、タブ同士を溶接する場合、溶接箇所で発生する熱は、タブが導電部材に溶接されていない場合に比べて導電部材に伝達され易くなり、導電部材は、溶接箇所で発生する熱がタブを介して活物質層やセパレータに伝達されるのを抑制する熱マスとして有効に機能する。 In the welding by the welding means, welding is first performed between the leading end side of the stepped portion of the positive electrode tab or the negative electrode tab and the conductive member, and then the welding point is sequentially moved to the base end side of the stepped portion. It is preferable to change and perform welding. According to this configuration, first, some positive electrode tabs or negative electrode tabs and the conductive member are welded, and then positive electrode tabs close to the conductive member or the negative electrode tabs are sequentially welded. Therefore, when the tabs are welded to each other, the heat generated at the welded portion is more easily transferred to the conductive member than when the tab is not welded to the conductive member. It effectively functions as a thermal mass that suppresses transmission to the active material layer and the separator via the.
前記溶接はレーザー溶接であることが好ましい。溶接は溶接箇所に過大な力を加えることなく溶接部が線状に延びるように連続的に溶接箇所を変更できればよいが、レーザー溶接はその要求を満たすとともに、被溶接材に非接触で溶接を行うため、溶接箇所に過大な力を加える虞がない。 The welding is preferably laser welding. Welding only needs to be able to change the welded part continuously so that the weld extends linearly without applying excessive force to the welded part, but laser welding fulfills that requirement and performs welding without contact with the workpiece. Therefore, there is no risk of applying excessive force to the welded part.
前記溶接はシーム溶接であることが好ましい。シーム溶接は、レーザー溶接に比較して１回の走査で溶接可能な溶接部の幅を広くすることが容易になるとともに、同時に溶接可能な正極タブあるいは負極タブの数枚を多くすることができる。 The welding is preferably seam welding. Seam welding makes it easier to increase the width of a weldable portion that can be welded in one scan as compared to laser welding, and can increase the number of positive or negative electrode tabs that can be welded simultaneously. .
本発明によれば、電極の複数枚の正極タブあるいは負極タブを導電部材に対し複数枚積層した状態で溶接するタブの溶接工程において、溶接箇所で発生する熱が、タブを介して活物質層やセパレータに伝わる量を抑制することができる。 According to the present invention, in the tab welding process in which a plurality of positive electrode tabs or negative electrode tabs of an electrode are welded in a state where a plurality of electrode tabs are laminated on a conductive member, the heat generated at the welding location is generated via the tabs through the active material layer. And the amount transmitted to the separator can be suppressed.
以下、本発明を積層型の電極組立体を備えた二次電池に具体化した一実施形態を図１〜図５にしたがって説明する。
図１及び図２に示すように、蓄電装置としての二次電池１０は、四角箱状のケース１１内に積層型の電極組立体１２及び電解液（図示せず）が収容されている。ケース１１はケース本体１３及びその開口部を覆う蓋体１４とで構成され、ケース本体１３と蓋体１４とは溶接により接合されている。
Hereinafter, an embodiment in which the present invention is embodied in a secondary battery including a stacked electrode assembly will be described with reference to FIGS.
As shown in FIGS. 1 and 2, a secondary battery 10 as a power storage device includes a laminated electrode assembly 12 and an electrolytic solution (not shown) housed in a square box-like case 11. The case 11 includes a case main body 13 and a lid body 14 that covers the opening thereof, and the case main body 13 and the lid body 14 are joined by welding.
図２に示すように、電極組立体１２は、集電体としての金属箔１５の両面に活物質層１６ａを有する複数の正極１６と、金属箔１５の両面に活物質層１７ａを有する複数の負極１７とが、両者の間にセパレータ１８が介在する状態で積層されている。正極１６及び負極１７は、活物質層１６ａ，１７ａが形成された部分が矩形状に形成されている。 As shown in FIG. 2, the electrode assembly 12 includes a plurality of positive electrodes 16 having active material layers 16 a on both surfaces of a metal foil 15 as a current collector, and a plurality of active material layers 17 a on both surfaces of the metal foil 15. A negative electrode 17 is laminated with a separator 18 interposed therebetween. In the positive electrode 16 and the negative electrode 17, the portions where the active material layers 16 a and 17 a are formed are formed in a rectangular shape.
図１に示すように、各正極１６には、電極組立体１２の一端面（図１において上端面）の左側寄りに正極タブ１６ｂが突設されている。正極タブ１６ｂは金属箔１５の一部が活物質層１６ａの一端から突出するようにして形成されている。各負極１７には、電極組立体１２の一端面（図１において上端面）の右側寄りに負極タブ１７ｂが突設されている。負極タブ１７ｂは金属箔１５の一部が活物質層１７ａの一端から突出するようにして形成されている。 As shown in FIG. 1, each positive electrode 16 has a positive electrode tab 16 b protruding from the left side of one end surface (the upper end surface in FIG. 1) of the electrode assembly 12. The positive electrode tab 16b is formed so that a part of the metal foil 15 protrudes from one end of the active material layer 16a. Each negative electrode 17 is provided with a negative electrode tab 17b projecting toward the right side of one end surface (the upper end surface in FIG. 1) of the electrode assembly 12. The negative electrode tab 17b is formed such that a part of the metal foil 15 protrudes from one end of the active material layer 17a.
セパレータ１８は、正極１６と負極１７との間の電気的絶縁性を確保するため、正極タブ１６ｂ及び負極タブ１７ｂを除いた正極１６及び負極１７の矩形部より大きな矩形状に形成されている。二次電池１０がリチウムイオン二次電池の場合、正極１６用の金属箔１５はアルミニウム箔が好ましく、負極１７用の金属箔１５は銅箔が好ましい。 The separator 18 is formed in a rectangular shape larger than the rectangular portions of the positive electrode 16 and the negative electrode 17 excluding the positive electrode tab 16 b and the negative electrode tab 17 b in order to ensure electrical insulation between the positive electrode 16 and the negative electrode 17. When the secondary battery 10 is a lithium ion secondary battery, the metal foil 15 for the positive electrode 16 is preferably an aluminum foil, and the metal foil 15 for the negative electrode 17 is preferably a copper foil.
図１及び図２に示すように、電極端子としての正極端子２０は、板状の導電部材２０ａを介して正極タブ１６ｂに溶接され、正極タブ１６ｂは先端側が電極組立体１２の上端面に沿って延びるように折り曲げられた状態で導電部材２０ａに溶接されている。この実施形態では、導電部材２０ａは、矩形状に形成されるとともに、正極タブ１６ｂの延びる方向と直交する方向に延びる状態で、一端側において正極タブ１６ｂに溶接されている。そして、図２に示すように、正極端子２０が蓋体１４に形成された孔１４ａから突出する状態で、蓋体１４がケース本体１３に接合されている。同様に、電極端子としての負極端子２１は、板状の導電部材２１ａを介して負極タブ１７ｂに溶接され、負極タブ１７ｂは先端側が電極組立体１２の上端面に沿って延びるように折り曲げられた状態で導電部材２１ａに溶接されている。図示しないが、負極端子２１が蓋体１４に形成された孔１４ａから突出する状態で、蓋体１４がケース本体１３に接合されている。なお、正極端子２０及び負極端子２１には、ケース１１から絶縁するための絶縁リング２２がそれぞれ取り付けられている。 As shown in FIGS. 1 and 2, the positive electrode terminal 20 as an electrode terminal is welded to the positive electrode tab 16 b through a plate-like conductive member 20 a, and the positive electrode tab 16 b has a distal end side along the upper end surface of the electrode assembly 12. It is welded to the conductive member 20a in a state bent so as to extend. In this embodiment, the conductive member 20a is formed in a rectangular shape, and is welded to the positive electrode tab 16b on one end side in a state extending in a direction orthogonal to the extending direction of the positive electrode tab 16b. As shown in FIG. 2, the lid body 14 is joined to the case body 13 with the positive electrode terminal 20 protruding from the hole 14 a formed in the lid body 14. Similarly, the negative electrode terminal 21 as an electrode terminal is welded to the negative electrode tab 17b via the plate-like conductive member 21a, and the negative electrode tab 17b is bent so that the tip side extends along the upper end surface of the electrode assembly 12. In this state, it is welded to the conductive member 21a. Although not shown, the lid body 14 is joined to the case body 13 in a state where the negative electrode terminal 21 protrudes from the hole 14 a formed in the lid body 14. Insulating rings 22 for insulating from the case 11 are attached to the positive terminal 20 and the negative terminal 21, respectively.
図３（ａ），（ｃ）に示すように、正極タブ１６ｂは、先端部が傾斜面、拡大した場合の断面は階段状、を形成するように積層され、複数の溶接部２４が正極タブ１６ｂの延びる方向（図３（ａ），（ｂ）の左右方向）と交差する方向、この実施形態では直交する方向（図３（ａ），（ｂ）の紙面と垂直方向）に延びる状態で導電部材２０ａに溶接されている。図示しないが、負極１７も同様に、先端部が傾斜面を形成するように積層され、複数の溶接部２４が負極タブ１７ｂの延びる方向と交差する方向、この実施形態では直交する方向に延びる状態で導電部材２１ａに溶接されている。なお、先端部が傾斜面を形成するとは、各正極タブ１６ｂあるいは各負極タブ１７ｂの先端部と当接する仮想平面が傾斜面となることを意味する。なお、正極タブ１６ｂは複数枚が同時に溶接されるが、溶接状態を分かり易くするため模式的にそれぞれ１枚で描いている。 As shown in FIGS. 3A and 3C, the positive electrode tab 16b is laminated so as to form an inclined surface at the tip and a stepped shape when enlarged, and a plurality of welds 24 are formed in the positive electrode tab. 16b extends in a direction intersecting with the extending direction (left and right direction in FIGS. 3A and 3B), in this embodiment, in a direction perpendicular to the paper surface in FIGS. 3A and 3B. It is welded to the conductive member 20a. Although not shown, the negative electrode 17 is similarly laminated so that the tip portion forms an inclined surface, and the plurality of welds 24 extend in a direction intersecting with the direction in which the negative electrode tab 17b extends, in this embodiment, in the orthogonal direction. And welded to the conductive member 21a. The fact that the tip portion forms an inclined surface means that a virtual plane that comes into contact with the tip portion of each positive electrode tab 16b or each negative electrode tab 17b becomes an inclined surface. A plurality of positive electrode tabs 16b are welded at the same time, but each of them is schematically drawn as one for easy understanding of the welding state.
次にタブ溶接工程を説明する。正極タブ１６ｂと正極用の導電部材２０ａとの接合構造及び負極タブ１７ｂと負極用の導電部材２１ａとの接合構造は対称に構成されているため、正極タブ１６ｂと導電部材２０ａとの溶接は、負極タブ１７ｂと導電部材２１ａとの溶接と基本的に同様に行われる。図示の都合上、正極タブ１６ｂと導電部材２０ａとの溶接について説明する。 Next, the tab welding process will be described. Since the joining structure of the positive electrode tab 16b and the conductive member 20a for the positive electrode and the joining structure of the negative electrode tab 17b and the conductive member 21a for the negative electrode are configured symmetrically, the welding of the positive electrode tab 16b and the conductive member 20a is This is basically the same as the welding of the negative electrode tab 17b and the conductive member 21a. For convenience of illustration, welding of the positive electrode tab 16b and the conductive member 20a will be described.
正極タブ１６ｂを導電部材２０ａに溶接する場合は、図４に示すように、電極組立体１２及び導電部材２０ａを支持台３０上の所定位置に載置する。そして、正極タブ１６ｂを、先端部が傾斜面を形成するように積層した状態で、溶接部２４が正極タブ１６ｂの延びる方向（図４の左右方向）と直交する方向（図４の紙面と垂直方向）に延びる状態となるように溶接を行う。この実施形態では、溶接は、レーザー溶接により行い、溶接手段としてのレーザー溶接装置のレーザー光照射ヘッド３５からレーザー光３５ａを積層された正極タブ１６ｂの上面に照射する。 When welding the positive electrode tab 16b to the conductive member 20a, the electrode assembly 12 and the conductive member 20a are placed at predetermined positions on the support base 30, as shown in FIG. And in the state which laminated | stacked the positive electrode tab 16b so that a front-end | tip part might form an inclined surface, the direction (perpendicular to the paper surface of FIG. 4) orthogonal to the direction (the left-right direction of FIG. 4) where the welding part 24 is extended. Weld so as to be in a state extending in the direction). In this embodiment, welding is performed by laser welding, and laser light 35a is irradiated on the upper surface of the stacked positive electrode tab 16b from a laser light irradiation head 35 of a laser welding apparatus as welding means.
詳述すると、電極組立体１２及び導電部材２０ａを支持台３０上の所定位置に配置し、全ての正極タブ１６ｂを先端部が傾斜面を形成するように導電部材２０ａ上に積層した状態でレーザー溶接を行う。図５に示すように、レーザー溶接は、正極タブ１６ｂの傾斜面の先端側と導電部材２０ａとの溶接を最初に行い、その後、溶接箇所を順次正極タブ１６ｂの傾斜面の基端側に変更して溶接を行う。この実施形態では、電極組立体１２及び導電部材２０ａが載置された支持台３０は固定して、レーザー光照射ヘッド３５を正極タブ１６ｂの延びる方向と直交する方向に所定距離走査することを繰り返す。 More specifically, the electrode assembly 12 and the conductive member 20a are arranged at predetermined positions on the support base 30, and all the positive electrode tabs 16b are laminated on the conductive member 20a so that the tip portion forms an inclined surface. Weld. As shown in FIG. 5, in laser welding, the leading end side of the inclined surface of the positive electrode tab 16b and the conductive member 20a are first welded, and then the welding location is sequentially changed to the proximal end side of the inclined surface of the positive electrode tab 16b. And perform welding. In this embodiment, the support base 30 on which the electrode assembly 12 and the conductive member 20a are placed is fixed, and the laser light irradiation head 35 is repeatedly scanned a predetermined distance in a direction orthogonal to the extending direction of the positive electrode tab 16b. .
即ち、先ず、導電部材２０ａと接触している正極タブ１６ｂ及びその上に積層された数枚の正極タブ１６ｂと導電部材２０ａとが溶接された後、導電部材２０ａに近い正極タブ１６ｂ同士が順に溶接される。そのため、正極タブ１６ｂ同士を溶接する場合、溶接箇所で発生する熱は、正極タブ１６ｂが導電部材２０ａに溶接されていない場合に比べて導電部材２０ａに伝達され易くなり、導電部材２０ａは、溶接箇所で発生する熱が正極タブ１６ｂを介して活物質層１６ａやセパレータ１８に伝達されるのを抑制する熱マスとして有効に機能する。 That is, first, after the positive electrode tab 16b in contact with the conductive member 20a and the several positive electrode tabs 16b stacked thereon and the conductive member 20a are welded, the positive electrode tabs 16b close to the conductive member 20a are sequentially connected to each other. Welded. Therefore, when welding the positive electrode tabs 16b to each other, heat generated at the welded portion is more easily transmitted to the conductive member 20a than when the positive electrode tab 16b is not welded to the conductive member 20a. It effectively functions as a thermal mass that suppresses heat generated at the location from being transferred to the active material layer 16a and the separator 18 via the positive electrode tab 16b.
正極タブ１６ｂと導電部材２０ａとの溶接終了後、正極タブ１６ｂは、その先端側の部分が電極組立体１２の端面に沿うように折り曲げられて、図１及び図２に示す状態になる。 After completion of welding of the positive electrode tab 16b and the conductive member 20a, the positive electrode tab 16b is bent so that the tip side portion is along the end surface of the electrode assembly 12, and the state shown in FIGS.
この実施形態によれば、以下に示す効果を得ることができる。
（１）蓄電装置（二次電池１０）は、正極１６及び負極１７が絶縁された層状の構造を成し、正極１６及び負極１７はそれぞれ複数枚の正極タブ１６ｂ及び負極タブ１７ｂが導電部材２０ａ，２１ａを介して電極端子（正極端子２０、負極端子２１）と電気的に接続された電極組立体１２を備える。正極タブ１６ｂ及び負極タブ１７ｂは、先端部が傾斜面を形成するように積層され、複数の溶接部２４が正極タブ１６ｂ及び負極タブ１７ｂの延びる方向と交差する方向に延びる状態で導電部材２０ａ，２１ａに溶接されている。
According to this embodiment, the following effects can be obtained.
(1) The power storage device (secondary battery 10) has a layered structure in which the positive electrode 16 and the negative electrode 17 are insulated, and each of the positive electrode 16 and the negative electrode 17 includes a plurality of positive electrode tabs 16b and negative electrode tabs 17b that are conductive members 20a. , 21a, and an electrode assembly 12 electrically connected to the electrode terminals (positive electrode terminal 20, negative electrode terminal 21). The positive electrode tab 16b and the negative electrode tab 17b are stacked such that the tip portions form an inclined surface, and the plurality of welded portions 24 extend in a direction intersecting with the extending direction of the positive electrode tab 16b and the negative electrode tab 17b. It is welded to 21a.
この構成によれば、積層された正極タブ１６ｂあるいは負極タブ１７ｂは、それぞれ全ての正極タブ１６ｂあるいは負極タブ１７ｂと導電部材２０ａ，２１ａとが共通の溶接部２４で溶着されているのではなく、例えば、数枚ずつ別の溶接部２４で溶着されている。そのため、正極タブ１６ｂあるいは負極タブ１７ｂと導電部材２０ａ，２１ａ、正極タブ１６ｂあるいは負極タブ１７ｂ同士の溶接部２４の溶接面積を確保するために必要なレーザー光の走査回数は、レーザー光の走査をタブの根元（基端）側から先端方向に向かって行う場合に比べて、１回に照射されるレーザーの出力を下げても少なくなる。したがって、電極（正極１６、負極１７）の複数枚の正極タブ１６ｂあるいは負極タブ１７ｂを導電部材２０ａ，２１ａに対し複数枚積層した状態で溶接するタブの溶接工程において、溶接箇所で発生する熱が、タブを介して活物質層１６ａ，１７ａやセパレータ１８に伝わる量を抑制することができる。 According to this configuration, in the stacked positive electrode tab 16b or negative electrode tab 17b, not all the positive electrode tab 16b or negative electrode tab 17b and the conductive members 20a and 21a are welded together by the common welded portion 24, For example, several sheets are welded at different welds 24. Therefore, the number of scans of the laser beam necessary to secure the weld area of the welded portion 24 between the positive electrode tab 16b or the negative electrode tab 17b and the conductive members 20a and 21a, and the positive electrode tab 16b or the negative electrode tab 17b is determined by the scanning of the laser beam. Compared with the case of performing from the base (base end) side of the tab toward the distal end, the output of the laser irradiated at one time is reduced. Therefore, in the welding process of the tab in which a plurality of positive electrode tabs 16b or negative electrode tabs 17b of the electrodes (positive electrode 16, negative electrode 17) are welded to the conductive members 20a and 21a, heat generated at the welding location is generated. The amount transmitted to the active material layers 16a and 17a and the separator 18 through the tab can be suppressed.
（２）蓄電装置（二次電池１０）の製造方法は、正極１６及び負極１７が絶縁された層状の構造を成し、正極１６及び負極１７はそれぞれ複数枚の正極タブ１６ｂあるいは負極タブ１７ｂが導電部材２０ａ，２１ａを介して電極端子（正極端子２０及び負極端子２１）と電気的に接続された電極組立体１２を備える蓄電装置の製造方法である。そして、正極タブ１６ｂあるいは負極タブ１７ｂ同士及び正極タブ１６ｂと導電部材２０ａあるいは負極タブ１７ｂと導電部材２１ａを溶接するタブ溶接工程は、溶接部２４を連続的に形成可能な溶接手段に対して被溶接材をそれぞれ複数回相対移動させて溶接を行う。 (2) The method of manufacturing the power storage device (secondary battery 10) has a layered structure in which the positive electrode 16 and the negative electrode 17 are insulated, and each of the positive electrode 16 and the negative electrode 17 includes a plurality of positive electrode tabs 16b or negative electrode tabs 17b. This is a method for manufacturing a power storage device including the electrode assembly 12 electrically connected to the electrode terminals (the positive electrode terminal 20 and the negative electrode terminal 21) through the conductive members 20a and 21a. The tab welding process for welding the positive electrode tabs 16b or the negative electrode tabs 17b and the positive electrode tab 16b and the conductive member 20a or the negative electrode tab 17b and the conductive member 21a is performed on the welding means capable of continuously forming the welded portion 24. Welding is performed by moving the welding material relative to each other multiple times.
この構成によれば、例えば、レーザー溶接で溶接を行う場合、積層された正極タブ１６ｂあるいは負極タブ１７ｂと導電部材２０ａ，２１ａあるいは積層されたタブ同士の溶接部の溶接面積を確保するために必要なレーザー光の走査回数は、レーザー光の走査をタブの根元（基端）側から先端方向に向かって行う場合に比べて、１回に照射されるレーザーの出力を下げても少なくなる。したがって、電極（正極１６、負極１７）の複数枚の正極タブ１６ｂあるいは負極タブ１７ｂを導電部材２０ａ，２１ａに対し複数枚積層した状態で溶接するタブの溶接工程において、溶接箇所で発生する熱が、タブを介して活物質層１６ａ，１７ａやセパレータ１８に伝わる量を抑制することができる。 According to this configuration, for example, when welding is performed by laser welding, it is necessary to secure the welding area of the welded portion between the stacked positive electrode tab 16b or the negative electrode tab 17b and the conductive members 20a and 21a or the stacked tabs. The number of times of scanning with a laser beam is reduced even when the output of the laser irradiated at one time is lowered, compared to the case where the scanning of the laser beam is performed from the base (base end) side of the tab toward the distal end. Therefore, in the welding process of the tab in which a plurality of positive electrode tabs 16b or negative electrode tabs 17b of the electrodes (positive electrode 16, negative electrode 17) are welded to the conductive members 20a and 21a, heat generated at the welding location is generated. The amount transmitted to the active material layers 16a and 17a and the separator 18 through the tab can be suppressed.
（３）溶接手段による溶接は、正極タブ１６ｂあるいは負極タブ１７ｂの傾斜面の先端側と導電部材２０ａ，２１ａとの溶接を最初に行い、その後、溶接箇所を順次傾斜面の基端側に変更して溶接を行う。この構成によれば、先ず、導電部材２０ａと接触している正極タブ１６ｂ及びその上に積層された数枚の正極タブ１６ｂと導電部材２０ａとが溶接された後、導電部材２０ａに近い正極タブ１６ｂ同士が順に溶接される。また、導電部材２１ａと接触している負極タブ１７ｂ及びその上に積層された数枚の負極タブ１７ｂと導電部材２１ａとが溶接された後、導電部材２１ａに近い負極タブ１７ｂ同士が順に溶接される。そのため、タブ同士を溶接する場合、溶接箇所で発生する熱は、タブが導電部材２０ａ，２１ａに溶接されていない場合に比べて導電部材２０ａ，２１ａに伝達され易くなり、導電部材２０ａ，２１ａは、溶接箇所で発生する熱がタブを介して活物質層１６ａ，１７ａやセパレータ１８に伝達されるのを抑制する熱マスとして有効に機能する。 (3) Welding by welding means is performed by first welding the leading end side of the inclined surface of the positive electrode tab 16b or the negative electrode tab 17b and the conductive members 20a and 21a, and then sequentially changing the welding location to the proximal end side of the inclined surface. And perform welding. According to this structure, first, the positive electrode tab 16b in contact with the conductive member 20a and the positive electrode tabs 16b stacked on the positive electrode tab 16b and the conductive member 20a are welded, and then the positive electrode tab close to the conductive member 20a. 16b are welded in order. In addition, after the negative electrode tab 17b in contact with the conductive member 21a and several negative electrode tabs 17b stacked on the negative electrode tab 17b and the conductive member 21a are welded, the negative electrode tabs 17b close to the conductive member 21a are sequentially welded. The Therefore, when the tabs are welded to each other, the heat generated at the welded portion is more easily transmitted to the conductive members 20a and 21a than when the tab is not welded to the conductive members 20a and 21a. It effectively functions as a thermal mass that suppresses the heat generated at the welding location from being transmitted to the active material layers 16a, 17a and the separator 18 via the tabs.
（４）溶接はレーザー溶接である。溶接は溶接箇所に過大な力を加えることなく溶接部２４が線状に延びるように連続的に溶接箇所を変更できればよいが、レーザー溶接はその要求を満たすとともに、被溶接材に非接触で溶接を行うため、溶接箇所に過大な力を加える虞がない。 (4) The welding is laser welding. For welding, it is only necessary that the welding location can be continuously changed so that the welded portion 24 extends linearly without applying excessive force to the welding location, but laser welding satisfies that requirement and performs welding without contact with the workpiece. Therefore, there is no possibility of applying an excessive force to the welded portion.
実施形態は前記に限定されるものではなく、例えば、次のように具体化してもよい。
○ 溶接をシーム溶接としてもよい。例えば、図６に示すように、溶接手段としての一対の加圧通電可能な円板状の溶接電極４１ａ，４１ｂを回転させながら溶接を線状に行うシーム溶接が好適に用いられる。図６は、先端部が傾斜面を形成するように積層された正極タブ１６ｂの先端側と導電部材２０ａとを溶接している状態を示す。即ち、正極タブ１６ｂの先端側と導電部材２０ａとが重ね合わされた部分が、正極タブ１６ｂの延びる方向（図６の紙面と垂直方向）と直交する方向に移動されつつ、溶接電極４１ａ，４１ｂ間を通過する間に抵抗溶接が連続的に行われる。その結果、溶接部２４が正極タブ１６ｂの延びる方向と直交する方向に延びる状態で、正極タブ１６ｂと導電部材２０ａとがシーム溶接される。シーム溶接は、レーザー溶接に比較して１回の走査で溶接可能な溶接部の幅を広くすることが容易になるとともに、同時に溶接可能な正極タブ１６ｂあるいは負極タブ１７ｂの数枚を多くすることができる。
The embodiment is not limited to the above, and may be embodied as follows, for example.
○ Welding may be seam welding. For example, as shown in FIG. 6, seam welding is preferably used in which welding is performed linearly while rotating a pair of pressurizing and energizing disk-shaped welding electrodes 41a and 41b as welding means. FIG. 6 shows a state in which the front end side of the positive electrode tab 16b laminated so that the front end portion forms an inclined surface and the conductive member 20a are welded. That is, the portion where the leading end side of the positive electrode tab 16b and the conductive member 20a are overlapped is moved in a direction perpendicular to the direction in which the positive electrode tab 16b extends (perpendicular to the paper surface of FIG. 6), and between the welding electrodes 41a and 41b. Resistance welding is carried out continuously while passing through. As a result, the positive electrode tab 16b and the conductive member 20a are seam welded in a state where the welded portion 24 extends in a direction orthogonal to the direction in which the positive electrode tab 16b extends. Seam welding makes it easier to increase the width of the welded portion that can be welded in one scan compared to laser welding, and simultaneously increases the number of positive electrode tabs 16b or negative electrode tabs 17b that can be welded. Can do.
○ 正極タブ１６ｂあるいは負極タブ１７ｂと導電部材２０ａ，２１ａとを接合する複数の溶接部２４のうち、一部の溶接部２４が正極タブ１６ｂ及び負極タブ１７ｂの延びる方向と直交する方向に延びる状態に形成され、残りの溶接部２４が正極タブ１６ｂ及び負極タブ１７ｂの延びる方向に対して斜めに延びる状態に形成されてもよい。また、一部の溶接部２４が正極タブ１６ｂ及び負極タブ１７ｂの延びる方向と平行に延びる状態に形成されてもよい。即ち、正極タブ１６ｂ及び負極タブ１７ｂは、先端部が傾斜面を形成するように積層され、複数の溶接部２４の少なくとも一部の溶接部２４が正極タブ１６ｂ及び負極タブ１７ｂの延びる方向と交差する方向に延びる状態で導電部材２０ａ，２１ａに溶接されていればよい。 ○ Among the plurality of welded portions 24 that join the positive electrode tab 16b or the negative electrode tab 17b and the conductive members 20a and 21a, a part of the welded portions 24 extends in a direction orthogonal to the extending direction of the positive electrode tab 16b and the negative electrode tab 17b. The remaining welded portion 24 may be formed so as to extend obliquely with respect to the extending direction of the positive electrode tab 16b and the negative electrode tab 17b. Further, a part of the welds 24 may be formed in a state extending in parallel with the extending direction of the positive electrode tab 16b and the negative electrode tab 17b. That is, the positive electrode tab 16b and the negative electrode tab 17b are laminated so that the tip portions form an inclined surface, and at least some of the welded portions 24 of the plurality of welded portions 24 intersect with the extending direction of the positive electrode tab 16b and the negative electrode tab 17b. What is necessary is just to be welded to the electrically-conductive members 20a and 21a in the state extended in the direction to do.
○ 図７に示すように、複数の溶接部２４の中に、先端部が傾斜面を形成するように積層された正極タブ１６ｂの先端側と導電部材２０ａとを接合する溶接部２４と、正極タブ１６ｂ同士を接合する溶接部２４とが一体に連続した溶接部２４が存在してもよい。 As shown in FIG. 7, a welded portion 24 that joins the conductive member 20 a to the distal end side of the positive electrode tab 16 b that is laminated so that the distal end portion forms an inclined surface in the plurality of welded portions 24, and the positive electrode There may be a welded portion 24 in which the welded portion 24 that joins the tabs 16b is continuous.
○ 正極タブ１６ｂあるいは負極タブ１７ｂは、それぞれ溶接部２４より正極１６側あるいは負極１７側、即ち、先端部が傾斜面を形成するように積層された正極タブ１６ｂあるいは負極タブ１７ｂの基端側においてカシメ部材を介して導電部材２０ａ，２１ａに固定されていてもよい。例えば、図８（ｂ）に示すように、矩形状の導電部材２０ａの一端寄りにカシメ部材取付け部２８を形成する。そして、図８（ａ）に示すように、積層された正極タブ１６ｂの基端側とカシメ部材取付け部２８とをカシメ部材２９でカシメ固定する。図示しないが導電部材２１ａにも同様にカシメ部材取付け部２８を形成し、負極タブ１７ｂの基端側とカシメ部材取付け部２８とをカシメ部材２９でカシメ固定する。 The positive electrode tab 16b or the negative electrode tab 17b is located on the positive electrode 16 side or the negative electrode 17 side from the welded portion 24, that is, on the proximal end side of the positive electrode tab 16b or the negative electrode tab 17b laminated so that the tip end portion forms an inclined surface. The conductive members 20a and 21a may be fixed via caulking members. For example, as shown in FIG. 8B, a caulking member attaching portion 28 is formed near one end of the rectangular conductive member 20a. Then, as shown in FIG. 8A, the base end side of the stacked positive electrode tabs 16 b and the caulking member attaching portion 28 are caulked and fixed by the caulking member 29. Although not shown, a caulking member attaching portion 28 is similarly formed on the conductive member 21 a, and the base end side of the negative electrode tab 17 b and the caulking member attaching portion 28 are caulked and fixed by the caulking member 29.
先端部が傾斜面を形成するように積層された状態で導電部材２０ａ，２１ａと電気的に接続されている正極タブ１６ｂあるいは負極タブ１７ｂのうち、傾斜面の先端側に位置する正極タブ１６ｂあるいは負極タブ１７ｂが導電部材２０ａ，２１ａと溶着されている。そのため、正極タブ１６ｂあるいは負極タブ１７ｂ全体に力が加わった場合、正極タブ１６ｂあるいは負極タブ１７ｂと導電部材２０ａ，２１ａとの溶着部に応力集中が生じ易い。しかし、正極タブ１６ｂあるいは負極タブ１７ｂは、それぞれ溶接部２４より正極側あるいは負極側においてカシメ部材２９を介して導電部材２０ａ，２１ａに固定されているため、正極タブ１６ｂあるいは負極タブ１７ｂと導電部材２０ａ，２１ａとの溶着部に応力集中が生じ難くなる。 Of the positive electrode tab 16b or the negative electrode tab 17b that is electrically connected to the conductive members 20a and 21a in a state where the front end portions are laminated so as to form an inclined surface, the positive electrode tab 16b positioned on the front end side of the inclined surface or The negative electrode tab 17b is welded to the conductive members 20a and 21a. Therefore, when force is applied to the entire positive electrode tab 16b or negative electrode tab 17b, stress concentration tends to occur at the welded portion between the positive electrode tab 16b or negative electrode tab 17b and the conductive members 20a and 21a. However, since the positive electrode tab 16b or the negative electrode tab 17b is fixed to the conductive members 20a and 21a via the caulking member 29 on the positive electrode side or the negative electrode side from the welded portion 24, respectively, the positive electrode tab 16b or the negative electrode tab 17b and the conductive member Stress concentration is less likely to occur at the welded portions with 20a and 21a.
○ カシメ部材２９の材質は特に限定されず、例えば、金属製であっても樹脂製であってもよい。
○ 電極組立体１２は積層型に限らず巻回型であってもよい。
O The material of the crimping member 29 is not specifically limited, For example, it may be metal or resin.
The electrode assembly 12 is not limited to the laminated type, and may be a wound type.
○ 電極（正極１６、負極１７）は、活物質層１６ａ，１７ａが集電体（金属箔１５）の両面に形成された構成に限らず、片面に形成された構成であってもよい。
○ 正極タブ１６ｂ及び負極タブ１７ｂは、正極１６あるいは負極１７の活物質層１６ａ，１７ａが形成された集電体（金属箔１５）の活物質非塗布部で集電体と一体に形成された構造に限らない。例えば、集電体（金属箔１５）の活物質非塗布部に対して、別に形成された金属箔製のタブを溶接して形成され構造であってもよい。
The electrode (positive electrode 16, negative electrode 17) is not limited to the configuration in which the active material layers 16a and 17a are formed on both sides of the current collector (metal foil 15), but may have a configuration formed on one side.
The positive electrode tab 16b and the negative electrode tab 17b were formed integrally with the current collector in the active material non-application portion of the current collector (metal foil 15) on which the active material layers 16a and 17a of the positive electrode 16 or the negative electrode 17 were formed. It is not limited to the structure. For example, the structure formed by welding the tab made from metal foil formed separately with respect to the active material non-application part of a collector (metal foil 15) may be sufficient.
○ 溶接は、レーザー溶接に代えて電子ビーム溶接であってもよい。
○ 二次電池１０は電解液が必須ではなく、電解質として電解液を使用する構成であっても、電解液を使用せずに固体電解質や高分子電解質を使用する構成であってもよい。
○ Welding may be electron beam welding instead of laser welding.
The secondary battery 10 does not require an electrolytic solution, and may be configured to use an electrolytic solution as an electrolyte, or may be configured to use a solid electrolyte or a polymer electrolyte without using an electrolytic solution.
○ 蓄電装置は、二次電池１０に限らず、例えば、電気二重層キャパシタやリチウムイオンキャパシタ等のようなキャパシタであってもよい。 The power storage device is not limited to the secondary battery 10 and may be a capacitor such as an electric double layer capacitor or a lithium ion capacitor.
１０…蓄電装置としての二次電池、１２…電極組立体、１６…正極、１６ｂ…正極タブ、１７…負極、１７ｂ…負極タブ、２０…電極端子としての正極端子、２１…電極端子としての負極端子、２０ａ，２１ａ…導電部材、２４…溶接部、２９…カシメ部材、３５…溶接手段としてのレーザー光照射ヘッド、４１ａ，４１ｂ…溶接手段としての溶接電極。 DESCRIPTION OF SYMBOLS 10 ... Secondary battery as power storage device, 12 ... Electrode assembly, 16 ... Positive electrode, 16b ... Positive electrode tab, 17 ... Negative electrode, 17b ... Negative electrode tab, 20 ... Positive electrode terminal as electrode terminal, 21 ... Negative electrode as electrode terminal Terminals, 20a, 21a ... conductive members, 24 ... welds, 29 ... caulking members, 35 ... laser light irradiation heads as welding means, 41a, 41b ... welding electrodes as welding means.
Claims (6)
前記正極タブ及び前記負極タブは、先端部が傾斜面を形成するように積層され、複数の溶接部の少なくとも一部の溶接部が前記正極タブ及び前記負極タブの延びる方向と交差する方向に延びる状態で前記導電部材に溶接されていることを特徴とする蓄電装置。 An electricity storage comprising a layered structure in which a positive electrode and a negative electrode are insulated, and each of the positive electrode and the negative electrode includes an electrode assembly in which a plurality of positive electrode tabs and negative electrode tabs are electrically connected to electrode terminals via conductive members. A device,
The positive electrode tab and the negative electrode tab are stacked so that tip portions form an inclined surface, and at least some of the weld portions of the plurality of weld portions extend in a direction intersecting with the extending direction of the positive electrode tab and the negative electrode tab. A power storage device that is welded to the conductive member in a state.
前記正極タブあるいは前記負極タブを、それぞれ先端部が傾斜面を形成するように積層した状態で、溶接部が前記正極タブあるいは前記負極タブの延びる方向と交差する方向に延びる状態となるように、前記正極タブと前記導電部材あるいは前記負極タブと前記導電部材を、溶接部を連続的に形成可能な溶接手段に対してそれぞれ複数回相対移動させて、前記導電部材に対して溶接を行うタブ溶接工程を備えることを特徴とする蓄電装置の製造方法。 An electricity storage comprising a layered structure in which a positive electrode and a negative electrode are insulated, and each of the positive electrode and the negative electrode includes an electrode assembly in which a plurality of positive electrode tabs and negative electrode tabs are electrically connected to electrode terminals via conductive members. A device manufacturing method comprising:
In such a state that the positive electrode tab or the negative electrode tab is laminated so that the tip portion forms an inclined surface, the welded portion extends in a direction intersecting the extending direction of the positive electrode tab or the negative electrode tab. Tab welding in which the positive electrode tab and the conductive member or the negative electrode tab and the conductive member are moved relative to each other by a plurality of times with respect to a welding means capable of continuously forming a welded portion, thereby welding the conductive member. A method for manufacturing a power storage device, comprising a step.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2014051455A JP2015176701A (en) | 2014-03-14 | 2014-03-14 | Power storage device and method for manufacturing power storage device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2014051455A JP2015176701A (en) | 2014-03-14 | 2014-03-14 | Power storage device and method for manufacturing power storage device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2015176701A true JP2015176701A (en) | 2015-10-05 |
Family
ID=54255736
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2014051455A Pending JP2015176701A (en) | 2014-03-14 | 2014-03-14 | Power storage device and method for manufacturing power storage device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2015176701A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017084654A (en) * | 2015-10-29 | 2017-05-18 | 株式会社豊田自動織機 | Electrode assembly manufacturing method and electrode assembly |
| JP2017107655A (en) * | 2015-12-07 | 2017-06-15 | 株式会社豊田自動織機 | Electrode assembly |
| DE102016225252A1 (en) | 2016-12-16 | 2018-06-21 | Robert Bosch Gmbh | Electrical energy storage, in particular battery cell, with space-optimized electrode interconnection |
| CN108808096A (en) * | 2017-04-28 | 2018-11-13 | 丰田自动车株式会社 | Layer-built battery |
| CN109119667A (en) * | 2017-06-26 | 2019-01-01 | 三洋电机株式会社 | Rectangular secondary cell |
| CN110336084A (en) * | 2019-08-09 | 2019-10-15 | 珠海冠宇电池有限公司 | A kind of anti-bending adjustment component of lithium ion cell polar ear and fixture |
| CN114284647A (en) * | 2021-12-17 | 2022-04-05 | 上海瑞浦青创新能源有限公司 | Connecting structure of lithium battery non-isopolar lug and polar column |
| WO2022179760A1 (en) * | 2021-02-23 | 2022-09-01 | Rofin-Sinar Laser Gmbh | Laser welding metal foil stack to metal substrate |
-
2014
- 2014-03-14 JP JP2014051455A patent/JP2015176701A/en active Pending
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017084654A (en) * | 2015-10-29 | 2017-05-18 | 株式会社豊田自動織機 | Electrode assembly manufacturing method and electrode assembly |
| JP2017107655A (en) * | 2015-12-07 | 2017-06-15 | 株式会社豊田自動織機 | Electrode assembly |
| CN108206260B (en) * | 2016-12-16 | 2022-08-26 | 罗伯特·博世有限公司 | Electrical energy store with spatially optimized electrode connections |
| US10714714B2 (en) | 2016-12-16 | 2020-07-14 | Robert Bosch Gmbh | Electrical energy store, specifically a battery cell, with spatially-optimized electrode interconnection |
| DE102016225252A1 (en) | 2016-12-16 | 2018-06-21 | Robert Bosch Gmbh | Electrical energy storage, in particular battery cell, with space-optimized electrode interconnection |
| CN108206260A (en) * | 2016-12-16 | 2018-06-26 | 罗伯特·博世有限公司 | The energy storage of electrode connection with structure space optimization |
| US11011810B2 (en) | 2017-04-28 | 2021-05-18 | Toyota Jidosha Kabushiki Kaisha | Stacked battery |
| JP2018190522A (en) * | 2017-04-28 | 2018-11-29 | トヨタ自動車株式会社 | Layer-built cell |
| CN108808096B (en) * | 2017-04-28 | 2021-08-03 | 丰田自动车株式会社 | Laminated battery |
| CN108808096A (en) * | 2017-04-28 | 2018-11-13 | 丰田自动车株式会社 | Layer-built battery |
| CN109119667A (en) * | 2017-06-26 | 2019-01-01 | 三洋电机株式会社 | Rectangular secondary cell |
| CN109119667B (en) * | 2017-06-26 | 2024-03-08 | 三洋电机株式会社 | Square secondary battery |
| CN110336084A (en) * | 2019-08-09 | 2019-10-15 | 珠海冠宇电池有限公司 | A kind of anti-bending adjustment component of lithium ion cell polar ear and fixture |
| CN110336084B (en) * | 2019-08-09 | 2024-05-17 | 珠海冠宇电池股份有限公司 | Lithium ion battery tab bending-prevention adjusting assembly and fixture |
| WO2022179760A1 (en) * | 2021-02-23 | 2022-09-01 | Rofin-Sinar Laser Gmbh | Laser welding metal foil stack to metal substrate |
| CN114284647A (en) * | 2021-12-17 | 2022-04-05 | 上海瑞浦青创新能源有限公司 | Connecting structure of lithium battery non-isopolar lug and polar column |
| CN114284647B (en) * | 2021-12-17 | 2023-12-05 | 上海瑞浦青创新能源有限公司 | Connection structure of unequal tab and pole of lithium battery |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2015176701A (en) | Power storage device and method for manufacturing power storage device | |
| JP5935580B2 (en) | Power storage device manufacturing method and secondary battery manufacturing method | |
| JP6274034B2 (en) | Power storage device | |
| JP6756266B2 (en) | Power storage device and manufacturing method of power storage device | |
| JP2015099681A (en) | Sealed battery | |
| JP6593304B2 (en) | Electric storage device and method for manufacturing electric storage device | |
| JP2016029627A (en) | Power storage device and manufacturing method thereof | |
| JP2014182881A (en) | Power storage device and manufacturing method of power storage device | |
| JP5962280B2 (en) | Electrode manufacturing method | |
| JP6364985B2 (en) | Power storage device manufacturing method and power storage device manufacturing apparatus | |
| JP2019003837A (en) | Electrode assembly | |
| JP2014093149A (en) | Power storage device | |
| JP2019061949A (en) | Electrical storage device, and laser welding method for electrical storage device | |
| JP2019207767A (en) | Manufacturing method of power storage device | |
| JP2020004643A (en) | Power storage device | |
| JP2016054062A (en) | Positioning structure | |
| JP6364972B2 (en) | Power storage device and method for manufacturing power storage device | |
| JP2014056672A (en) | Power storage device and manufacturing method of power storage device | |
| JP2018032594A (en) | Electrode welding apparatus | |
| JP2020013706A (en) | Power storage device and manufacturing method thereof | |
| JP2020191209A (en) | Power storage device and manufacturing method thereof | |
| JP6772830B2 (en) | Power storage device | |
| JP2020013745A (en) | Manufacturing method of power storage device | |
| JP6065610B2 (en) | Method for manufacturing power storage device | |
| JP2016022508A (en) | Resistance welding method and resistance welding structure |