JP2019061779A - Power storage device and power storage method - Google Patents
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- 238000003860 storage Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title description 3
- 230000005611 electricity Effects 0.000 claims abstract description 5
- 238000009413 insulation Methods 0.000 claims abstract description 5
- 238000005452 bending Methods 0.000 claims description 18
- 230000000452 restraining effect Effects 0.000 abstract 1
- 238000007789 sealing Methods 0.000 description 13
- 238000003466 welding Methods 0.000 description 12
- 239000011888 foil Substances 0.000 description 8
- 229910052751 metal Inorganic materials 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000007773 negative electrode material Substances 0.000 description 5
- 239000007774 positive electrode material Substances 0.000 description 5
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000011149 active material Substances 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005304 joining Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
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- 238000010030 laminating Methods 0.000 description 1
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- 239000007788 liquid Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
Description
本開示は、蓄電装置及び蓄電装置の製造方法に関する。 The present disclosure relates to a power storage device and a method of manufacturing the power storage device.
ＥＶ（Ｅｌｅｃｔｒｉｃ Ｖｅｈｉｃｌｅ）やＰＨＶ（Ｐｌｕｇ ｉｎ Ｈｙｂｒｉｄ Ｖｅｈｉｃｌｅ）等の車両には、モータへの供給電力を蓄える蓄電装置として、リチウムイオン二次電池等の二次電池が搭載されている。 2. Description of the Related Art In vehicles such as EVs (Electric Vehicles) and PHVs (Plug in Hybrid Vehicles), secondary batteries such as lithium ion secondary batteries are mounted as power storage devices for storing power supplied to a motor.
例えば、特許文献１には、電極に突出形成されたタブ部を複数重ねた状態で集電端子と電気的に接続する蓄電装置であって、前記タブ部は、前記タブ部の根元から前記タブ部が重なるまでの間の部分である集合部と、前記集合部より先端側で前記タブ部の突出する方向に延びる直進部と、前記直進部より先端側で前記直進部から折り曲げられて形成された折り曲げ部とを有しており、前記集電端子は、第１部材と、前記第１部材と協同して前記タブ部を挟持する第２部材とを備え、前記第１部材及び前記第２部材は、前記折り曲げ部における前記タブの重ね方向において、前記折り曲げ部の両側に設けられるとともに、前記折り曲げ部を挟む挟持面をそれぞれ有し、前記第１部材及び前記第２部材の前記電極に近い方には前記直進部が挿入されるスリットが形成され、複数の前記タブ部のうち最も前記第１部材側に配置された前記タブ部は、前記第１部材の前記挟持面に接合されているとともに、複数の前記タブ部のうち最も前記第２部材側に配置された前記タブ部は、前記第２部材の前記挟持面に接合されている蓄電装置が開示されている。 For example, Patent Document 1 discloses a power storage device that electrically connects a current collection terminal in a state where a plurality of tab portions protruding from an electrode are stacked, and the tab portion is the tab from the root of the tab portion. It is formed by being bent from the rectilinear portion at a tip end side from the rectilinear portion, a congruent portion being a portion until the portions overlap, a rectilinear portion extending in a direction in which the tab portion protrudes on the tip end side The current collecting terminal includes a first member and a second member which holds the tab portion in cooperation with the first member, and the first member and the second member The members are provided on both sides of the bent portion in the overlapping direction of the tabs in the bent portion, and each have a holding surface sandwiching the bent portion, and are close to the electrodes of the first member and the second member. The straight part is inserted into the Slit is formed, and the tab portion disposed closest to the first member among the plurality of tab portions is joined to the sandwiching surface of the first member, and the tab portion among the plurality of tab portions The said tab part arrange | positioned most at the said 2nd member side has disclosed the electrical storage apparatus joined to the said clamping surface of the said 2nd member.
ところで、正極及び負極を含む電極体の縁部から突出した複数の電極タブが重ねられた電極タブ群は、電極体と当該電極体を収容するケース内面との間の空間に配置される。この電極タブ群が配置される空間はデッドスペースとなるため、電極タブ群の配置状態によっては、デッドスペースが大きくなり、電池サイズやエネルギー密度等に影響を与える。そこで、電極タブ群を折り曲げることで、デッドスペースを削減することは可能である。しかし、蓄電装置に振動や衝撃等が加えられた場合、折り曲げた電極タブ群が延びて、電極体が移動して、ケース内面と接触する場合がある。このような場合、電極体を構成する電極（正極や負極）が折れ曲がったり、電極を構成する活物質（正極活物質や負極活物質）が脱落したりして、蓄電装置の性能に影響を与えることになる。 An electrode tab group in which a plurality of electrode tabs projecting from an edge of an electrode body including a positive electrode and a negative electrode are stacked is disposed in a space between the electrode body and an inner surface of a case for housing the electrode body. Since the space in which the electrode tab group is disposed is a dead space, the dead space becomes large depending on the arrangement state of the electrode tab group, which affects the battery size, the energy density, and the like. Therefore, it is possible to reduce the dead space by bending the electrode tab group. However, when vibration, impact or the like is applied to the power storage device, the bent electrode tab group may extend, causing the electrode body to move and contact the inner surface of the case. In such a case, the electrode (positive electrode or negative electrode) constituting the electrode body is bent, or the active material (positive electrode active material or negative electrode active material) constituting the electrode falls off, which affects the performance of the power storage device. It will be.
そこで、本開示の目的は、電極体等を収容するケース内のデッドスペースを削減すると共に、電極体の移動を抑制することが可能な蓄電装置および当該蓄電装置の製造方法を提供することである。 Therefore, it is an object of the present disclosure to provide a power storage device capable of suppressing the movement of the electrode body while reducing the dead space in the case for housing the electrode body and the like, and a method of manufacturing the power storage device. .
本開示の一態様である蓄電装置は、電極体と、前記電極体の縁部から突出した複数の電極タブを重ねた電極タブ群と、前記電極体との間で電気を授受する電極端子と、前記電極タブの重なり方向における前記電極タブ群の一端に接続され、前記電極タブ群から前記電極端子へと導電させる集電部材と、前記電極タブの重なり方向における前記電極タブ群の他端に接続される絶縁部材と、を有する蓄電装置であって、前記電極タブ群は、前記電極タブ群の一端側に折り曲げられた折曲部と、前記折曲部から前記電極体の厚み方向に延在する延在部と、を有し、前記折曲部は、前記電極タブの重なり方向の両端から前記集電部材と前記絶縁部材で挟まれている。 An electricity storage device according to an aspect of the present disclosure includes an electrode body, an electrode tab group in which a plurality of electrode tabs protruding from an edge portion of the electrode body are overlapped, and an electrode terminal for transferring electricity between the electrode body and the electrode tab group. A current collecting member connected to one end of the electrode tab group in the overlapping direction of the electrode tabs and conductive from the electrode tab group to the electrode terminal, and the other end of the electrode tab group in the overlapping direction of the electrode tabs A storage device having an insulating member to be connected, wherein the electrode tab group extends in the thickness direction of the electrode body from a bent portion bent to one end side of the electrode tab group and the bent portion The bent portion is sandwiched between the current collecting member and the insulating member from both ends in the overlapping direction of the electrode tabs.
本開示の一態様である蓄電装置の製造方法は、電極体の縁部から突出した複数の電極タブを重ねて電極タブ群を形成する第１工程と、前記電極タブの重なり方向における前記電極タブ群の一端に集電部材を接続する第２工程と、前記集電部材の端部を起点として、前記電極タブ群の一端側に前記電極タブ群を折り曲げて、折曲部及び前記折曲部から前記電極体の厚み方向に延在する延在部を形成する第３工程と、前記電極タブの重なり方向における前記電極タブ群の他端に絶縁部材を配置して、前記電極タブ群の前記折曲部を、前記電極タブの重なり方向の両端から前記集電部材と前記絶縁部材で挟持する第４工程と、を有する。 In a method of manufacturing a power storage device according to an aspect of the present disclosure, a first step of forming a group of electrode tabs by overlapping a plurality of electrode tabs protruding from an edge of an electrode body, and the electrode tab in the overlapping direction of the electrode tabs A second step of connecting the current collecting member to one end of the group, and bending the electrode tab group to one end side of the electrode tab group starting from the end of the current collecting member to form a bent portion and the bent portion Forming an extending portion extending in the thickness direction of the electrode body from the electrode body, and arranging an insulating member at the other end of the electrode tab group in the overlapping direction of the electrode tabs, And a fourth step of sandwiching the bent portion between the current collecting member and the insulating member from both ends in the overlapping direction of the electrode tabs.
本開示の一態様によれば、電極体等を収容するケース内のデッドスペースを削減すると共に、電極体の移動を抑制することが可能となる。 According to one aspect of the present disclosure, it is possible to reduce the dead space in the case for housing the electrode body and the like and to suppress the movement of the electrode body.
以下、実施形態の一例について詳細に説明する。実施形態の説明で参照する図面は、模式的に記載されたものであり、図面に描画された構成要素の寸法比率などは、現物と異なる場合がある。 Hereinafter, an example of the embodiment will be described in detail. The drawings referred to in the description of the embodiments are schematically described, and the dimensional ratio of the component drawn in the drawings may be different from the actual one.
図１は、本実施形態の一例である二次電池の模式断面図である。図１に示すように、蓄電装置としての二次電池１０は、電極体１２、電極体１２の縁部から突出した正極タブ群１４及び負極タブ群１６、正極集電部材１８及び負極集電部材２０、正極絶縁部材２２及び負極絶縁部材２４、ケース２６、正極端子２８及び負極端子３０、を備える。本実施形態の二次電池１０はリチウムイオン電池であり、外郭が角型をなす角型電池である。 FIG. 1 is a schematic cross-sectional view of a secondary battery which is an example of the present embodiment. As shown in FIG. 1, the secondary battery 10 as a power storage device includes an electrode body 12, a positive electrode tab group 14 and a negative electrode tab group 16 protruding from the edge of the electrode body 12, a positive electrode current collector 18 and a negative electrode current collector 20, the positive electrode insulating member 22, the negative electrode insulating member 24, the case 26, the positive electrode terminal 28, and the negative electrode terminal 30 are provided. The secondary battery 10 of the present embodiment is a lithium ion battery, and is a rectangular battery whose outer shell has a rectangular shape.
ケース２６は、四角箱状のケース本体部３２と矩形平板状の封口体３４とから構成される。封口体３４の外側面には、所定の間隔を空けて正極端子２８及び負極端子３０が設置されている。また、封口体３４と正極端子２８との間及び封口体３４と負極端子３０との間には絶縁板３６が設置されていることが望ましい。 The case 26 is composed of a square box-like case main body 32 and a rectangular flat sealing member 34. The positive electrode terminal 28 and the negative electrode terminal 30 are disposed on the outer surface of the sealing body 34 at a predetermined interval. In addition, it is desirable that an insulating plate 36 be provided between the sealing body 34 and the positive electrode terminal 28 and between the sealing body 34 and the negative electrode terminal 30.
図２は、電極体の構成要素を示す分解模式斜視図である。図２に示すように、電極体１２は、シート状の正極３８と、シート状の負極４０と、セパレータ４２とを備える。正極３８は、正極金属箔４４（例えば、アルミニウム箔）と、その両面に正極活物質を含む正極活物質層４６とを有する。負極４０は、負極金属箔４８（例えば、銅箔）と、その両面に負極活物質を含む負極活物質層５０とを有する。電極体１２は、正極３８と負極４０との間に、これらを絶縁するセパレータ４２を介在させた積層構造であり、正極３８と、負極４０と、セパレータ４２とからなる組が複数組設けられている。 FIG. 2 is an exploded schematic perspective view showing components of the electrode assembly. As shown in FIG. 2, the electrode body 12 includes a sheet-like positive electrode 38, a sheet-like negative electrode 40, and a separator 42. The positive electrode 38 has a positive electrode metal foil 44 (for example, an aluminum foil) and a positive electrode active material layer 46 including a positive electrode active material on both sides thereof. The negative electrode 40 has a negative electrode metal foil 48 (for example, copper foil) and a negative electrode active material layer 50 containing a negative electrode active material on both sides thereof. The electrode body 12 has a laminated structure in which a separator 42 for insulating these is interposed between the positive electrode 38 and the negative electrode 40, and a plurality of sets of the positive electrode 38, the negative electrode 40, and the separator 42 are provided There is.
正極３８は、正極金属箔４４に正極活物質が塗布されていない領域からなる正極未塗工部を有している。そして、正極３８の縁部の一部には、縁部から突出した形状の正極未塗工部からなる正極タブ５２が形成されている。負極４０は、負極金属箔４８に負極活物質が塗布されていない領域からなる負極未塗工部を有している。そして、負極４０の縁部の一部には、縁部から突出した形状の負極未塗工部からなる負極タブ５４が形成されている。なお、正極タブ５２及び負極タブ５４は、正極３８及び負極４０が積層された状態で、正極タブ５２と負極タブ５４とが重ならない位置にそれぞれ設けられている。 The positive electrode 38 has a positive electrode uncoated portion formed of a region where the positive electrode active material is not applied to the positive electrode metal foil 44. Then, on a part of the edge of the positive electrode 38, a positive electrode tab 52 composed of a positive electrode uncoated portion having a shape protruding from the edge is formed. The negative electrode 40 has a negative electrode uncoated portion formed of a region where the negative electrode active material is not applied to the negative electrode metal foil 48. Then, on a part of the edge portion of the negative electrode 40, a negative electrode tab 54 formed of a negative electrode uncoated portion having a shape protruding from the edge portion is formed. The positive electrode tab 52 and the negative electrode tab 54 are provided at positions where the positive electrode tab 52 and the negative electrode tab 54 do not overlap in a state in which the positive electrode 38 and the negative electrode 40 are stacked.
正極３８は、それぞれの正極タブ５２が電極体１２の積層方向に沿って列状に配置されるように積層されている。そして、正極タブ５２を電極体１２の積層方向の一端から他端までの範囲内で重ねることで正極タブ群１４が形成される。また、負極４０は、それぞれの負極タブ５４が電極体１２の積層方向に沿って列状に配置されるように積層されている。そして、負極タブ５４を電極体１２の積層方向の一端から他端までの範囲内で重ねることで負極タブ群１６が形成される。 The positive electrodes 38 are stacked such that the respective positive electrode tabs 52 are arranged in a row along the stacking direction of the electrode body 12. Then, the positive electrode tab group 14 is formed by overlapping the positive electrode tabs 52 in the range from one end to the other end of the electrode body 12 in the stacking direction. The negative electrodes 40 are stacked such that the negative tabs 54 are arranged in a row along the stacking direction of the electrode body 12. Then, the negative electrode tab group 16 is formed by overlapping the negative electrode tab 54 within the range from one end to the other end of the electrode body 12 in the stacking direction.
図１に示すように、正極集電部材１８は、板状部５６と、板状部５６上に形成されたリベット部５８とを備える。正極集電部材１８の板状部５６は、正極タブ群１４に接続されている。正極タブ群１４との接続構造については後で詳述する。正極集電部材１８のリベット部５８は、封口体３４及び絶縁板３６を介して、正極端子２８に接続されている。また、図での説明や省略するが、正極集電部材１８のリベット部５８の外周には、ケース２６から絶縁するためのリング状の絶縁部材が取り付けられている。このように、正極集電部材１８は、一方で、正極タブ群１４と接続し、他方で正極端子２８と接続しており、これにより、正極タブ群１４から正極端子２８へと導電させ、さらには、電極体１２と正極端子２８とを電気的に接続させている。負極集電部材２０も同様に、板状部５６と、板状部５６上に形成されたリベット部５８とを備える。負極集電部材２０の板状部５６は、負極タブ群１６に接続されている。負極集電部材２０のリベット部５８は、封口体３４及び絶縁板３６を介して、負極端子３０に接続されている。また、図での説明や省略するが、負極集電部材２０のリベット部５８の外周には、ケース２６から絶縁するためのリング状の絶縁部材が取り付けられている。このように、負極集電部材２０は、一方で、負極タブ群１６と接続し、他方で負極端子３０と接続しており、これにより、負極タブ群１６から負極端子３０へと導電させ、さらには、電極体１２と負極端子３０とを電気的に接続させている。 As shown in FIG. 1, the positive electrode current collection member 18 includes a plate-like portion 56 and a rivet portion 58 formed on the plate-like portion 56. The plate-like portion 56 of the positive electrode current collecting member 18 is connected to the positive electrode tab group 14. The connection structure with the positive electrode tab group 14 will be described in detail later. The rivet portion 58 of the positive electrode current collecting member 18 is connected to the positive electrode terminal 28 via the sealing body 34 and the insulating plate 36. Further, although not shown or described in the drawings, a ring-shaped insulating member for insulating from the case 26 is attached to the outer periphery of the rivet portion 58 of the positive electrode current collecting member 18. As described above, the positive electrode current collecting member 18 is connected to the positive electrode tab group 14 on the one hand and to the positive electrode terminal 28 on the other side, thereby causing conduction from the positive electrode tab group 14 to the positive electrode terminal 28 The electrode body 12 and the positive electrode terminal 28 are electrically connected. Similarly, the negative electrode current collecting member 20 also includes a plate portion 56 and a rivet portion 58 formed on the plate portion 56. The plate-like portion 56 of the negative electrode current collecting member 20 is connected to the negative electrode tab group 16. The rivet portion 58 of the negative electrode current collecting member 20 is connected to the negative electrode terminal 30 via the sealing body 34 and the insulating plate 36. Further, although not shown or described in the drawings, a ring-shaped insulating member for insulating from the case 26 is attached to the outer periphery of the rivet portion 58 of the negative electrode current collecting member 20. Thus, the negative electrode current collecting member 20 is connected to the negative electrode tab group 16 on the one hand, and to the negative electrode terminal 30 on the other side, thereby causing conduction from the negative electrode tab group 16 to the negative electrode terminal 30, The electrode body 12 and the negative electrode terminal 30 are electrically connected.
正極絶縁部材２２は、正極タブ群１４に接続されている。正極タブ群１４との接続構造については後で後述するが、正極絶縁部材２２は、正極タブ群１４とケース２６内面との間に介在し、これにより、ケース２６と正極タブ５２との電気的絶縁が確保される。なお、正極絶縁部材２２は、封口体３４の内面等のケース２６の内面に固定されていることが望ましい。負極絶縁部材２４は、負極タブ群１６に接続されている。そして、負極絶縁部材２４は、負極タブ群１６とケース２６内面との間に介在し、これにより、ケース２６と負極タブ５４との電気的絶縁が確保される。なお、負極絶縁部材２４は、封口体３４の内面等のケース２６の内面に固定されていることが望ましい。 The positive electrode insulating member 22 is connected to the positive electrode tab group 14. The connection structure with the positive electrode tab group 14 will be described later, but the positive electrode insulating member 22 is interposed between the positive electrode tab group 14 and the inner surface of the case 26, whereby the electrical connection between the case 26 and the positive electrode tab 52 Insulation is secured. The positive electrode insulating member 22 is preferably fixed to the inner surface of the case 26 such as the inner surface of the sealing body 34. The negative electrode insulating member 24 is connected to the negative electrode tab group 16. Then, the negative electrode insulating member 24 is interposed between the negative electrode tab group 16 and the inner surface of the case 26, whereby electrical insulation between the case 26 and the negative electrode tab 54 is secured. The negative electrode insulating member 24 is preferably fixed to the inner surface of the case 26 such as the inner surface of the sealing body 34.
以下に、正極タブ群１４と正極集電部材１８及び正極絶縁部材の接合構造について、図３を用いて説明する。なお、負極タブ群１６と負極集電部材２０及び負極絶縁部材の接合構造は、正極３８側と同様であるのでその説明を省略する。 Below, the joining structure of the positive electrode tab group 14, the positive electrode current collection member 18, and the positive electrode insulating member is demonstrated using FIG. In addition, since the joining structure of the negative electrode tab group 16, the negative electrode current collection member 20, and the negative electrode insulating member is the same as that of the positive electrode 38 side, the description thereof is omitted.
図３は、図１のＡ−Ａ線における二次電池の拡大模式断面図である。図３に示すように、正極タブ群１４は、電極体１２の積層方向の一端から他端までの範囲内にある全ての正極タブ５２が重ねられたものであり、具体的には、電極体１２の積層方向の一端の正極タブ５２(Ｈ１)が、他端の正極タブ５２（Ｈ２）に近接するよう重ねられている。電極体１２の積層方向は電極体１２の厚み方向となる。 FIG. 3 is an enlarged schematic cross-sectional view of the secondary battery taken along line AA in FIG. As shown in FIG. 3, in the positive electrode tab group 14, all the positive electrode tabs 52 within the range from one end to the other end in the stacking direction of the electrode body 12 are overlapped, and specifically, the electrode body The positive electrode tab 52 (H1) at one end in the stacking direction of 12 is stacked so as to be close to the positive electrode tab 52 (H2) at the other end. The stacking direction of the electrode body 12 is the thickness direction of the electrode body 12.
図３に示すように、正極タブ群１４は、折曲部６０と、折曲部６０から電極体１２の積層方向(厚み方向)に延在する延在部６２とを有する。そして、正極タブ５２の重なり方向における正極タブ群１４の一端側（すなわち、正極タブ５２（Ｈ１））には、正極集電部材１８の板状部５６が接続されている。具体的には、正極集電部材１８の板状部５６と正極タブ群１４の延在部６２とが、抵抗溶接や超音波溶接等により電気的に接続されている。そして、正極集電部材１８の板状部５６は、正極タブ群１４の延在部６２及び折曲部６０の内側に配置されており、板状部５６の一端は、折曲部６０の内側面に当接している。なお、正極タブ群１４と接触している面と反対側の板状部５６の面は、電極体１２と向かい合う面となる。 As shown in FIG. 3, the positive electrode tab group 14 has a bent portion 60 and an extending portion 62 extending from the bent portion 60 in the stacking direction (thickness direction) of the electrode body 12. The plate-like portion 56 of the positive electrode current collecting member 18 is connected to one end side (that is, the positive electrode tab 52 (H1)) of the positive electrode tab group 14 in the overlapping direction of the positive electrode tabs 52. Specifically, the plate-like portion 56 of the positive electrode current collecting member 18 and the extension portion 62 of the positive electrode tab group 14 are electrically connected by resistance welding, ultrasonic welding or the like. The plate-like portion 56 of the positive electrode current collecting member 18 is disposed inside the extending portion 62 and the bending portion 60 of the positive electrode tab group 14, and one end of the plate-like portion 56 is an inside of the bending portion 60. It is in contact with the side. The surface of the plate-like portion 56 opposite to the surface in contact with the positive electrode tab group 14 is a surface facing the electrode body 12.
また、図３に示すように、正極タブ５２の重なり方向における正極タブ群１４の他端（すなわち、正極タブ５２（Ｈ２））には、正極絶縁部材２２が接続されている。なお、正極タブ群１４と接触している面と反対側の正極絶縁部材２２の面は、ケース２６の内面と向かい合う面となる。以下に、正極絶縁部材２２の具体的な構成例を説明する。 Further, as shown in FIG. 3, the positive electrode insulating member 22 is connected to the other end of the positive electrode tab group 14 (that is, the positive electrode tab 52 (H2)) in the overlapping direction of the positive electrode tabs 52. The surface of the positive electrode insulating member 22 opposite to the surface in contact with the positive electrode tab group 14 is a surface facing the inner surface of the case 26. Hereinafter, a specific configuration example of the positive electrode insulating member 22 will be described.
図３に示す正極絶縁部材２２は、正極タブ群１４の延在部６２を覆う、矩形平板状の本体部６４と、本体部６４の両端に設けられる断面Ｌ字状の側壁部（６６ａ，６６ｂ）とを有する。正極絶縁部材２２の側壁部６６ａは、正極タブ群１４の折曲部６０の外側面を覆うように配置されている。 The positive electrode insulating member 22 shown in FIG. 3 covers the extension portion 62 of the positive electrode tab group 14 and has a rectangular flat plate-like main body 64 and side walls (66a, 66b) having L-shaped cross sections provided at both ends of the main body 64. And. The side wall portion 66 a of the positive electrode insulating member 22 is disposed so as to cover the outer side surface of the bent portion 60 of the positive electrode tab group 14.
正極タブ群１４の折曲部６０の内側面に当接している正極集電部材１８の板状部５６の一端と、正極タブ群１４の折曲部６０の外側面に配置されている正極絶縁部材２２の側壁部６６ａとで、正極タブ群１４の折曲部６０をタブの重なり方向の両端から挟持している。ここで、正極集電部材１８の板状部５６の他端が、正極絶縁部材２２の側壁部６６ｂに当接し、板状部５６が、正極絶縁部材２２の両端の側壁部（６６ａ，６６ｂ）との間で固定されるため、板状部５６の一端と正極絶縁部材２２の側壁部６６ａは一定の力で、折曲部６０を挟持している。なお、正極絶縁部材２２と正極タブ群１４とは、接着剤等で固定することが望ましいが、単に物理的に接触しているだけでもよい。 Positive electrode insulation disposed on one end of the plate-like portion 56 of the positive electrode current collecting member 18 in contact with the inner side surface of the bent portion 60 of the positive electrode tab group 14 and on the outer surface of the bent portion 60 of the positive electrode tab group 14 The bent portions 60 of the positive electrode tab group 14 are held by the side wall portion 66 a of the member 22 from both ends in the overlapping direction of the tabs. Here, the other end of the plate-like portion 56 of the positive electrode current collecting member 18 abuts on the side wall 66 b of the positive electrode insulating member 22, and the plate-like portion 56 is a side wall (66 a, 66 b) at both ends of the positive electrode insulating member 22. Therefore, one end of the plate-like portion 56 and the side wall portion 66a of the positive electrode insulating member 22 sandwich the bent portion 60 with a constant force. In addition, although it is desirable to fix the positive electrode insulating member 22 and the positive electrode tab group 14 with an adhesive or the like, it may be merely in physical contact.
図４は、蓄電装置の製造方法の一例を説明する図である。図４（Ａ）に示すように、正極、セパレータ、負極からなる組を複数積層した電極体１２の厚み方向（積層方向）において、一端側に位置する正極タブ５２(Ｈ１)を、他端側に位置する正極タブ５２(Ｈ２)に近接するように集める。これにより、電極体１２の作製段階で、独立していた各正極タブ５２が重ねられて、正極タブ群１４となる（第１工程）。次に、図４（Ｂ）に示すように、正極タブ５２の重なり方向における正極タブ群１４の一端側、すなわち正極タブ５２（Ｈ１）に、正極集電部材１８の板状部５６を当接させ、超音波溶接機のホーン６８とアンビル７０で、正極タブ群１４および板状部５６を挟み、所定の圧力を掛けて溶接する。これにより、正極タブ群１４と正極集電部材１８とを電気的に接続する（第２工程）。溶接は、超音波溶接機に限定されず、抵抗溶接機等でもよい。次に、図４（Ｃ）に示すように、板状部５６の一端を起点として、正極タブ５２の重なり方向における正極タブ群１４の一端側に、正極タブ群１４を折り曲げ、折曲部６０及び折曲部６０から電極体１２の厚み方向（積層方向）に延在する延在部６２を形成する（第３工程）。すなわち、正極タブ群１４を折り曲げた後の正極集電部材１８の板状部５６は、折曲部６０及び延在部６２の内側に配置される。次に、図４（Ｄ）に示すように、正極タブ５２の重なり方向における正極タブ群１４の他端側、すなわち正極タブ５２（Ｈ２）に、正極絶縁部材２２を配置して、折曲部６０を、正極タブ５２の重なり方向の両端から正極絶縁部材２２と正極集電部材１８の板状部５６とで挟持する（第４工程）。なお、負極側の説明は省略するが、負極側も同様に、第１工程〜第４工程を行い、負極タブ群１６に負極集電部材２０及び負極絶縁部材２４を接続する。 FIG. 4 is a diagram for explaining an example of a method of manufacturing a power storage device. As shown in FIG. 4A, in the thickness direction (stacking direction) of the electrode assembly 12 in which a plurality of pairs of positive electrode, separator, and negative electrode are stacked, the positive electrode tab 52 (H1) located at one end is To be close to the positive electrode tab 52 (H2) located on the Thereby, each positive electrode tab 52 which was independent in the preparation stage of the electrode body 12 is piled up, and it becomes the positive electrode tab group 14 (1st process). Next, as shown in FIG. 4B, the plate-like portion 56 of the positive electrode current collector 18 is in contact with one end side of the positive electrode tab group 14 in the overlapping direction of the positive electrode tabs 52, that is, the positive electrode tab 52 (H1). The positive electrode tab group 14 and the plate-like portion 56 are sandwiched between the horn 68 and the anvil 70 of the ultrasonic welding machine, and welding is performed by applying a predetermined pressure. Thereby, the positive electrode tab group 14 and the positive electrode current collection member 18 are electrically connected (second step). The welding is not limited to the ultrasonic welding machine, and may be a resistance welding machine or the like. Next, as shown in FIG. 4C, starting from one end of the plate portion 56, the positive electrode tab group 14 is bent to one end side of the positive electrode tab group 14 in the overlapping direction of the positive electrode tabs 52. And the extension part 62 extended in the thickness direction (lamination direction) of the electrode body 12 from the bending part 60 is formed (3rd process). That is, the plate-like portion 56 of the positive electrode current collecting member 18 after bending the positive electrode tab group 14 is disposed inside the bent portion 60 and the extending portion 62. Next, as shown in FIG. 4D, the positive electrode insulating member 22 is disposed on the other end side of the positive electrode tab group 14 in the overlapping direction of the positive electrode tabs 52, that is, the positive electrode tab 52 (H2). 60 is held by the positive electrode insulating member 22 and the plate-like portion 56 of the positive electrode current collecting member 18 from both ends in the overlapping direction of the positive electrode tabs 52 (fourth step). Although the description on the negative electrode side is omitted, the first to fourth steps are similarly performed on the negative electrode side, and the negative electrode current collecting member 20 and the negative electrode insulating member 24 are connected to the negative electrode tab group 16.
また、正極集電部材１８のリベット部５８を、封口体３４に設置された正極端子２８に接続し、負極集電部材２０のリベット部５８を、封口体３４に設置された負極端子３０に接続する。そして、電極体１２、正極タブ群１４、負極タブ群１６、正極絶縁部材２２、負極絶縁部材２４、正極集電部材１８、負極集電部材２０等をケース本体部３２内に収容して、ケース本体部３２と封口体３４とを密閉する。そして、封口体３４に設けた注液口（不図示）から電解液を注入する。以上のようにして、蓄電装置を製造する。 Further, the rivet portion 58 of the positive electrode current collecting member 18 is connected to the positive electrode terminal 28 provided on the sealing member 34, and the rivet portion 58 of the negative electrode current collecting member 20 is connected to the negative electrode terminal 30 provided on the sealing member 34. Do. Then, the electrode body 12, the positive electrode tab group 14, the negative electrode tab group 16, the positive electrode insulating member 22, the negative electrode insulating member 24, the positive electrode current collecting member 18, the negative electrode current collecting member 20, etc. The main body 32 and the sealing body 34 are sealed. Then, the electrolytic solution is injected from a liquid injection port (not shown) provided in the sealing body 34. As described above, a power storage device is manufactured.
以上説明した、本実施形態によれば以下の効果を得ることが可能である。以下に述べる電極は正極及び負極の両方を指しており、例えば、電極タブ群と言えば、正極タブ群及び負極タブ群を指している。 According to the embodiment described above, the following effects can be obtained. The electrodes described below refer to both the positive electrode and the negative electrode, and, for example, the term “electrode tab group” refers to the positive electrode tab group and the negative electrode tab group.
本実施形態の蓄電装置において、電極タブ群が、電極タブの重なり方向における電極タブ群の一端側に折り曲げた折曲部を有することで、電極タブ群が配置されるケース内のデッドスペースを削減することが可能となる。また、本実施形態においては、電極タブを折り曲げる方向である電極タブ群の一端側に集電部材を配置し、電極タブ群の他端側に絶縁部材を配置している。すなわち、集電部材を電極タブ群の延在部及び折曲部の内側に、絶縁部材を電極タブ群の延在部及び折曲部の外側に配置しているため、折曲部の折り曲げ角度を鋭角にすることができ、電極タブ群が配置されるケース内のデッドスペースをより削減することが可能となる。これにより、蓄電装置のサイズを小さくしたり、或いは蓄電装置のエネルギー密度を向上させたりすることが可能となる。 In the power storage device of the present embodiment, the electrode tab group has a bent portion bent at one end side of the electrode tab group in the overlapping direction of the electrode tabs, thereby reducing the dead space in the case where the electrode tab group is disposed It is possible to Further, in the present embodiment, the current collecting member is disposed on one end side of the electrode tab group in the direction in which the electrode tab is bent, and the insulating member is disposed on the other end side of the electrode tab group. That is, since the current collecting member is disposed on the inside of the extending portion and the bending portion of the electrode tab group, and the insulating member is disposed on the outside of the extending portion and the bending portion of the electrode tab group, the bending angle of the bending portion Can be sharpened, and it is possible to further reduce the dead space in the case where the electrode tabs are arranged. Thus, the size of the power storage device can be reduced, or the energy density of the power storage device can be improved.
また、電極タブ群の折曲部を、タブの重なり方向の両端から集電部材と絶縁部材で挟んでいるため、蓄電装置に衝撃や振動が加えられた場合でも、電極タブ群の延びが抑制され、電極体の移動が抑えられる。これにより、電極体がケース内面と接触することが抑えられるため、電極体を構成する電極の折れ曲り、電極を構成する活物質の脱落による電池性能の低下が抑制される。 Further, since the bent portions of the electrode tab group are sandwiched between the current collecting member and the insulating member from both ends in the overlapping direction of the tabs, extension of the electrode tab group is suppressed even when shock or vibration is applied to the power storage device. Movement of the electrode body is suppressed. As a result, the contact of the electrode body with the inner surface of the case is suppressed, so that deterioration of the battery performance due to bending of the electrode constituting the electrode body and dropping of the active material constituting the electrode is suppressed.
また、本実施形態の蓄電装置の製造方法によれば、電極タブの重なり方向における電極タブ群の一端に集電部材を接続し、当該集電部材の一端を起点として、電極タブ群を折り曲げるため、折曲部の折り曲げ位置を安定させることができる。これにより、ケース内に電極体を収容する際に、電極体がケースに引っ掛かることなく、スムーズに収容することが可能となる。 Further, according to the method of manufacturing the power storage device of the present embodiment, the current collecting member is connected to one end of the electrode tab group in the overlapping direction of the electrode tabs, and the electrode tab group is bent starting from the one end of the current collecting member. , The bending position of the bending portion can be stabilized. As a result, when the electrode assembly is accommodated in the case, the electrode assembly can be accommodated smoothly without being caught by the case.
図５は、実施形態の変形例を説明するための二次電池の模式断面図である。図５の二次電池１１において、図１の二次電池１０と同様の構成については同一の符号を付している。電極体の縁部から突出する正極タブ群及び負極タブ群は、図１に示す二次電池１０のように、電極体１２の上端の縁部から突出する正極タブ群１４及び負極タブ群１６に制限されず、図５に示す二次電池１１のように、電極体１２の側面の縁部から突出する正極タブ群１４及び負極タブ群１６でもよい。 FIG. 5 is a schematic cross-sectional view of a secondary battery for describing a modification of the embodiment. In the secondary battery 11 of FIG. 5, the same components as those of the secondary battery 10 of FIG. 1 are denoted by the same reference numerals. Like the secondary battery 10 shown in FIG. 1, the positive electrode tab group and the negative electrode tab group 16 protruding from the edge of the electrode body are the positive electrode tab group 14 and the negative electrode tab group 16 protruding from the upper edge of the electrode body 12. The positive electrode tab group 14 and the negative electrode tab group 16 may be projected from the edge of the side surface of the electrode body 12 as in the secondary battery 11 shown in FIG. 5 without limitation.
図６は、実施形態の変形例を説明するための二次電池の拡大模式断面図である。図６は図３と同じ方向から見た断面図である。図６の二次電池１３において、図１の二次電池１０と同様の構成については同一の符号を付している。図６に示すように、正極タブ群１４は、電極体１２の積層方向（厚み方向）において分割された第１正極タブ群１４ａと第２正極タブ群１４ｂとを有する。第１正極タブ群１４ａは、一方の最も外側の正極タブ５２(Ｈ３)が、他方の最も外側の正極タブ５２(Ｈ２)に近接するように重ねられている。第２正極タブ群１４ｂは、一方の最も外側の正極タブ５２（Ｈ４）が、他方の最も外側にある正極タブ５２（Ｈ１）に近接するように重ねられている。 FIG. 6 is an enlarged schematic cross-sectional view of a secondary battery for describing a modification of the embodiment. 6 is a cross-sectional view seen from the same direction as FIG. In the secondary battery 13 of FIG. 6, the same components as those of the secondary battery 10 of FIG. 1 are denoted by the same reference numerals. As shown in FIG. 6, the positive electrode tab group 14 has a first positive electrode tab group 14 a and a second positive electrode tab group 14 b which are divided in the stacking direction (thickness direction) of the electrode body 12. The first positive electrode tab group 14a is stacked such that one outermost positive electrode tab 52 (H3) is adjacent to the other outermost positive electrode tab 52 (H2). The second positive electrode tab group 14b is stacked such that one outermost positive electrode tab 52 (H4) is adjacent to the other outermost positive electrode tab 52 (H1).
第１正極タブ群１４ａは、折曲部６０ａと、折曲部６０ａから電極体１２の積層方向（厚み方向）に延在する延在部６２ａとを有する。また、第２正極タブ群１４ｂは、折曲部６０ｂと、折曲部６０ｂから電極体１２の積層方向（厚み方向）に延在する延在部６２ｂとを有する。第１正極タブ群１４ａの折曲部６０ａ及び第２正極タブ群１４ｂの折曲部６０ｂは、第１正極タブ群１４ａの延在部６２ａと第２正極タブ群１４ｂの延在部６２ｂが互いに近づく方向に折り曲げられている。すなわち、第１正極タブ群１４ａの折曲部６０ａ及び第２正極タブ群１４ｂの折曲部６０ｂは、電極体１２の積層方向（厚み方向）の中央に向かって折り曲げられている。そして、正極集電部材１８の板状部５６は、第１正極タブ群１４ａおよび第２正極タブ群１４ｂの延在部（６２ａ，６２ｂ）及び折曲部（６０ａ，６０ｂ）の内側に配置されている。正極集電部材１８の板状部５６は、抵抗溶接や超音波溶接により、第１正極タブ群１４ａ及び第２正極タブ群１４ｂの延在部（６０ａ，６０ｂ）等と接続されている。板状部５６の一端は、第１正極タブ群１４ａの折曲部６０ａの内側面に当接している。また、板状部５６の他端は、第２正極タブ群１４ｂの折曲部６０ｂの内側面に当接している。 The first positive electrode tab group 14 a includes a bent portion 60 a and an extending portion 62 a extending from the bent portion 60 a in the stacking direction (thickness direction) of the electrode body 12. The second positive electrode tab group 14b has a bent portion 60b, and an extending portion 62b extending from the bent portion 60b in the stacking direction (thickness direction) of the electrode body 12. In the bent portion 60a of the first positive electrode tab group 14a and the bent portion 60b of the second positive electrode tab group 14b, the extending portion 62a of the first positive electrode tab group 14a and the extending portion 62b of the second positive electrode tab group 14b It is bent in the approaching direction. That is, the bent portion 60 a of the first positive electrode tab group 14 a and the bent portion 60 b of the second positive electrode tab group 14 b are bent toward the center in the stacking direction (thickness direction) of the electrode body 12. The plate-like portion 56 of the positive electrode current collecting member 18 is disposed inside the extension portions (62a, 62b) and the bent portions (60a, 60b) of the first positive electrode tab group 14a and the second positive electrode tab group 14b. ing. The plate-like portion 56 of the positive electrode current collecting member 18 is connected to the extension portions (60a, 60b) of the first positive electrode tab group 14a and the second positive electrode tab group 14b by resistance welding or ultrasonic welding. One end of the plate portion 56 is in contact with the inner side surface of the bent portion 60a of the first positive electrode tab group 14a. The other end of the plate-like portion 56 is in contact with the inner side surface of the bent portion 60b of the second positive electrode tab group 14b.
正極絶縁部材２２は、第１正極タブ群１４ａ及び第２正極タブ群１４ｂの延在部（６２ａ，６２ｂ）及び折曲部（６０ａ，６０ｂ）の外側に配置されている。具体的には、正極絶縁部材２２の本体部６４は、第１正極タブ群１４ａ及び第２正極タブ群１４ｂの延在部（６２ａ，６２ｂ）を覆うように配置されている。また、正極絶縁部材２２の一方の側壁部６６ａは、第１正極タブ群１４ａの折曲部６０ａの外側面を覆うように配置されており、正極絶縁部材２２の他方の側壁部６６ｂは、第２正極タブ群１４ｂの折曲部６０ｂの外側面を覆うように配置されている。そして、正極絶縁部材２２の側壁部６６ａと正極集電部材１８の板状部５６の一端とで、第１正極タブ群１４ａの折曲部６０ａをタブの重なり方向の両端から挟持している。また、正極絶縁部材２２の側壁部６６ｂと正極集電部材１８の板状部５６の他端とで、第２正極タブ群１４ｂの折曲部６０ｂをタブの重なり方向の両端から挟持している。負極側も同様であり、その説明を省略する。 The positive electrode insulating member 22 is disposed outside the extension portions (62a, 62b) and the bent portions (60a, 60b) of the first positive electrode tab group 14a and the second positive electrode tab group 14b. Specifically, the main body portion 64 of the positive electrode insulating member 22 is disposed so as to cover the extension portions (62a, 62b) of the first positive electrode tab group 14a and the second positive electrode tab group 14b. Further, one side wall portion 66a of the positive electrode insulating member 22 is disposed so as to cover the outer surface of the bent portion 60a of the first positive electrode tab group 14a, and the other side wall portion 66b of the positive electrode insulating member 22 is It arrange | positions so that the outer surface of the bending part 60b of 2 2 positive electrode tab group 14b may be covered. Then, the bent portion 60a of the first positive electrode tab group 14a is sandwiched by the side wall portion 66a of the positive electrode insulating member 22 and one end of the plate-like portion 56 of the positive electrode current collector 18 from both ends in the overlapping direction of the tabs. Further, the bent portion 60b of the second positive electrode tab group 14b is sandwiched from both ends in the overlapping direction of the tabs by the side wall portion 66b of the positive electrode insulating member 22 and the other end of the plate portion 56 of the positive electrode current collecting member 18. . The same applies to the negative electrode side, and the description thereof is omitted.
このように、電極タブ群を電極体の厚み方向において第１電極タブ群及び第２電極タブ群に分割し、第１電極タブ群の折曲部及び第２電極タブ群の折曲部を、第１電極タブ群の延在部と第２電極タブ群の延在部が互いに近づく方向に折り曲げることによって、電極タブ群が配置されるケース内のデッドスペースをさらに削減することが可能となる。 Thus, the electrode tab group is divided into the first electrode tab group and the second electrode tab group in the thickness direction of the electrode body, and the bent portion of the first electrode tab group and the bent portion of the second electrode tab group are It is possible to further reduce the dead space in the case in which the electrode tab group is disposed by bending the extension part of the first electrode tab group and the extension part of the second electrode tab group in the direction in which they approach each other.
実施形態は、上記に限定されるものではなく、本開示の効果を損なわない範囲において変形することが可能である。 Embodiments are not limited to the above, and may be modified as long as the effects of the present disclosure are not impaired.
例えば、蓄電装置は、リチウムイオン電池に限定されるものではなく、ニッケル水素電池等の他の種類の電池でもよいし、電気二重層キャパシタ等のようなキャパシタやその他の蓄電素子でもよい。また、例えば、電極体は積層型に限定されるものではなく、巻回型の電極体であってもよい。 For example, the storage device is not limited to a lithium ion battery, and may be another type of battery such as a nickel hydrogen battery, a capacitor such as an electric double layer capacitor, or another storage device. Also, for example, the electrode body is not limited to the laminated type, and may be a wound type electrode body.
正極タブ及び負極タブは、正極未塗工部及び負極未塗工部からなるものに限定されるものではなく、例えば、それぞれの電極に溶接した金属箔を正極タブ及び負極タブとしてもよい。 The positive electrode tab and the negative electrode tab are not limited to those composed of the positive electrode uncoated part and the negative electrode uncoated part, and for example, metal foils welded to the respective electrodes may be used as the positive electrode tab and the negative electrode tab.
正極絶縁部材及び正極集電部材の形状は、図３に示した形状以外の形状でもよい。正極絶縁部材は、正極集電部材と共に、正極タブ群の折曲部を正極タブの重なり方向の両端から挟持することができるものであればどのような形状であってもよい。正極集電部材は、正極絶縁部材と共に、正極タブ群の折曲部を正極タブの重なり方向の両端から挟持することができる形状であり、且つ正極タブ群から正極端子へと導電させることができるものであればどのような形状であってもよい。負極絶縁部材及び負極集電部材も同様である。 The shapes of the positive electrode insulating member and the positive electrode current collecting member may be shapes other than those shown in FIG. The positive electrode insulating member may have any shape as long as it can hold the bent portion of the positive electrode tab group from both ends in the overlapping direction of the positive electrode tab together with the positive electrode current collecting member. The positive electrode current collecting member, together with the positive electrode insulating member, has a shape capable of sandwiching the bent portion of the positive electrode tab group from both ends in the overlapping direction of the positive electrode tab, and can conduct electricity from the positive electrode tab group to the positive electrode terminal It may be of any shape as long as it is a thing. The same applies to the negative electrode insulating member and the negative electrode current collecting member.
正極タブ群と正極集電部材との接続は、超音波溶接や抵抗溶接に限定されるものではなく、例えば、レーザー溶接等でもよい。正極集電部材は、正極タブ群の一端側であればどこに溶接されてもよいが、延在部に溶接されることが望ましく、特に、厚みが３ｍｍ以上７ｍｍ以下の範囲の延在部に溶接されることが好ましい。負極タブ群と負極集電部材との接続も同様である。 The connection between the positive electrode tab group and the positive electrode current collecting member is not limited to ultrasonic welding or resistance welding, and may be, for example, laser welding or the like. The positive electrode current collecting member may be welded anywhere on one end side of the positive electrode tab group, but it is desirable that the positive electrode current collecting member is welded to the extension portion, and in particular, it is welded to the extension portion having a thickness of 3 mm or more and 7 mm or less Preferably. The connection between the negative electrode tab group and the negative electrode current collector is the same.
正極タブ群の延在部は、電極体の厚み方向に平行に延在していてもよいし、電極体の厚み方向に対して傾斜するように延在していてもよい。電極体の厚み方向に対する延在部の傾斜角度は例えば、０°〜２０°以下が好ましい。負極タブ群の延在部も同様である。 The extension portion of the positive electrode tab group may extend in parallel with the thickness direction of the electrode body, or may extend so as to be inclined with respect to the thickness direction of the electrode body. The inclination angle of the extension with respect to the thickness direction of the electrode body is preferably, for example, 0 ° to 20 ° or less. The same applies to the extension of the negative electrode tab group.
正極タブ群を厚み方向に分割した第１正極群及び第２正極タブ群は、電極体の積層方向（厚み方向）の一端から他端までの範囲内に位置する正極タブの全枚数のうち、均等の枚数の正極タブをそれぞれ有していてもよいし、異なる枚数の正極タブをそれぞれ有していてもよい。負極タブ群も同様である。 The first positive electrode group and the second positive electrode tab group obtained by dividing the positive electrode tab group in the thickness direction are the total number of positive electrode tabs located in the range from one end to the other end of the laminating direction (thickness direction) of the electrode assembly An equal number of positive electrode tabs may be respectively provided, or different numbers of positive electrode tabs may be respectively provided. The same applies to the negative electrode tab group.
１０，１１，１３ 二次電池、１２ 電極体、１４ 正極タブ群、１４ａ 第１正極タブ群、１４ｂ 第２正極タブ群、１６ 負極タブ群、１８ 正極集電部材、２０ 負極集電部材、２２ 正極絶縁部材、２４ 負極絶縁部材、２６ ケース、２８ 正極端子、３０ 負極端子、３２ ケース本体部、３４ 封口体、３６ 絶縁板、３８ 正極、４０ 負極、４２ セパレータ、４４ 正極金属箔、４６ 正極活物質層、４８ 負極金属箔、５０ 負極活物質層、５２ 正極タブ、５４ 負極タブ、５６ 板状部、５８ リベット部、６０，６０ａ，６０ｂ 折曲部、６２，６２ａ，６２ｂ 延在部、６４ 本体部、６６ａ，６６ｂ 側壁部、６８ ホーン、７０ アンビル。
10, 11, 13 Secondary battery, 12 electrode body, 14 positive electrode tab group, 14a first positive electrode tab group, 14b second positive electrode tab group, 16 negative electrode tab group, 18 positive electrode current collecting member, 20 negative electrode current collecting member, 22 Positive electrode insulating member, 24 negative electrode insulating member, 26 cases, 28 positive terminal, 30 negative terminal, 32 case main body, 34 sealing member, 36 insulating plate, 38 positive electrode, 40 negative electrode, 42 separator, 44 positive metal foil, 46 positive electrode active Material layer, 48 negative electrode metal foil, 50 negative electrode active material layer, 52 positive electrode tab, 54 negative electrode tab, 56 plate-like portion, 58 riveted portion, 60, 60a, 60b bent portion, 62, 62a, 62b extended portion, 64 Body portion, 66a, 66b side wall portion, 68 horn, 70 anvil.
Claims (3)
前記電極体の縁部から突出した複数の電極タブを重ねた電極タブ群と、
前記電極体との間で電気を授受する電極端子と、
前記電極タブの重なり方向における前記電極タブ群の一端に接続され、前記電極タブ群から前記電極端子へと導電させる集電部材と、
前記電極タブの重なり方向における前記電極タブ群の他端に接続される絶縁部材と、を有する蓄電装置であって、
前記電極タブ群は、前記電極タブ群の一端側に折り曲げられた折曲部と、前記折曲部から前記電極体の厚み方向に延在する延在部と、を有し、
前記折曲部は、前記電極タブの重なり方向の両端から前記集電部材と前記絶縁部材で挟まれている、蓄電装置。 Electrode body,
An electrode tab group in which a plurality of electrode tabs projecting from an edge of the electrode body are overlapped;
An electrode terminal for exchanging electricity with the electrode body;
A current collecting member connected to one end of the electrode tab group in the overlapping direction of the electrode tabs and electrically conducting from the electrode tab group to the electrode terminal;
And an insulating member connected to the other end of the electrode tab group in the overlapping direction of the electrode tabs.
The electrode tab group has a bent portion bent toward one end of the electrode tab group, and an extending portion extending from the bent portion in the thickness direction of the electrode body.
The said bending part is an electrical storage apparatus pinched | interposed with the said current collection member and the said insulation member from the both ends of the overlap direction of the said electrode tab.
前記第１電極タブ群と前記第２電極タブ群は、前記折曲部及び前記延在部を有し、
前記第１電極タブ群の前記折曲部及び前記第２電極タブ群の前記折曲部は、前記第１電極タブ群の前記延在部と前記第２電極タブ群の前記延在部が互いに近づく方向に折り曲げられ、
前記第１電極タブ群の前記折曲部及び前記第２電極タブ群の前記折曲部は、前記電極タブの重なり方向の両端から前記集電部材と前記絶縁部材で挟まれている、請求項１に記載の蓄電装置。 The electrode tab group has a first electrode tab group and a second electrode tab group divided in the thickness direction of the electrode body,
The first electrode tab group and the second electrode tab group have the bent portion and the extending portion,
The extending portion of the first electrode tab group and the extending portion of the second electrode tab group are mutually different in the bending portion of the first electrode tab group and the bending portion of the second electrode tab group It is bent in the approaching direction,
It is preferable that the bent portion of the first electrode tab group and the bent portion of the second electrode tab group are sandwiched between the current collecting member and the insulating member from both ends in the overlapping direction of the electrode tabs. The power storage device according to 1.
前記電極タブの重なり方向における前記電極タブ群の一端に集電部材を接続する第２工程と、
前記集電部材の端部を起点として、前記電極タブ群の一端側に前記電極タブ群を折り曲げて、折曲部及び前記折曲部から前記電極体の厚み方向に延在する延在部を形成する第３工程と、
前記電極タブの重なり方向における前記電極タブ群の他端に絶縁部材を配置して、前記電極タブ群の前記折曲部を、前記電極タブの重なり方向の両端から前記集電部材と前記絶縁部材で挟持する第４工程と、を有する蓄電装置の製造方法。
A first step of stacking a plurality of electrode tabs projecting from an edge of the electrode body to form an electrode tab group;
A second step of connecting a current collecting member to one end of the electrode tab group in the overlapping direction of the electrode tabs;
Starting from the end of the current collecting member, the electrode tab group is bent to one end side of the electrode tab group, and a bent portion and an extending portion extending from the bent portion in the thickness direction of the electrode body A third step of forming
An insulating member is disposed at the other end of the electrode tab group in the overlapping direction of the electrode tabs, and the bent portion of the electrode tab group is disposed from the both ends of the electrode tab in the overlapping direction. And a fourth step of holding at a step of:
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020195777A1 (en) | 2019-03-27 | 2020-10-01 | 株式会社キャタラー | Catalyst for purifying exhaust gas |
| WO2020238531A1 (en) * | 2019-05-29 | 2020-12-03 | 宁德时代新能源科技股份有限公司 | Secondary battery |
| WO2021060009A1 (en) * | 2019-09-26 | 2021-04-01 | 三洋電機株式会社 | Secondary battery and method for manufacturing same |
| WO2021124796A1 (en) * | 2019-12-19 | 2021-06-24 | パナソニック株式会社 | Non-aqueous electrolyte secondary battery |
| WO2021186947A1 (en) * | 2020-03-17 | 2021-09-23 | 三洋電機株式会社 | Non-aqueous electrolyte secondary battery |
| WO2021192664A1 (en) * | 2020-03-26 | 2021-09-30 | 三洋電機株式会社 | Secondary battery |
| WO2021192666A1 (en) * | 2020-03-26 | 2021-09-30 | 三洋電機株式会社 | Non-aqueous electrolyte secondary battery |
| JP2022115110A (en) * | 2021-01-28 | 2022-08-09 | プライムプラネットエナジー＆ソリューションズ株式会社 | secondary battery |
| WO2023005408A1 (en) * | 2021-07-30 | 2023-02-02 | 宁德时代新能源科技股份有限公司 | Battery cell, battery and electric device |
| CN116014375A (en) * | 2023-02-09 | 2023-04-25 | 深圳海润新能源科技有限公司 | Energy storage device and electric equipment |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001325945A (en) * | 2000-03-06 | 2001-11-22 | Mitsubishi Chemicals Corp | Cell and manufacturing method of the same |
| JP2004014516A (en) * | 2002-06-06 | 2004-01-15 | Varta Microbattery Gmbh | Battery equipped with housing |
| WO2013157433A1 (en) * | 2012-04-17 | 2013-10-24 | 株式会社 豊田自動織機 | Electricity storage device |
| JP2015032549A (en) * | 2013-08-06 | 2015-02-16 | 株式会社豊田自動織機 | Power storage device |
| JP2015099699A (en) * | 2013-11-19 | 2015-05-28 | 株式会社豊田自動織機 | Power storage device |
| DE102014019505A1 (en) * | 2014-12-23 | 2016-06-23 | Daimler Ag | Single cell and cell block for an electric battery |
| WO2016147955A1 (en) * | 2015-03-13 | 2016-09-22 | 株式会社 豊田自動織機 | Power storage device |
-
2017
- 2017-09-25 JP JP2017183574A patent/JP6967413B2/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001325945A (en) * | 2000-03-06 | 2001-11-22 | Mitsubishi Chemicals Corp | Cell and manufacturing method of the same |
| JP2004014516A (en) * | 2002-06-06 | 2004-01-15 | Varta Microbattery Gmbh | Battery equipped with housing |
| WO2013157433A1 (en) * | 2012-04-17 | 2013-10-24 | 株式会社 豊田自動織機 | Electricity storage device |
| JP2015032549A (en) * | 2013-08-06 | 2015-02-16 | 株式会社豊田自動織機 | Power storage device |
| JP2015099699A (en) * | 2013-11-19 | 2015-05-28 | 株式会社豊田自動織機 | Power storage device |
| DE102014019505A1 (en) * | 2014-12-23 | 2016-06-23 | Daimler Ag | Single cell and cell block for an electric battery |
| WO2016147955A1 (en) * | 2015-03-13 | 2016-09-22 | 株式会社 豊田自動織機 | Power storage device |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020195777A1 (en) | 2019-03-27 | 2020-10-01 | 株式会社キャタラー | Catalyst for purifying exhaust gas |
| WO2020238531A1 (en) * | 2019-05-29 | 2020-12-03 | 宁德时代新能源科技股份有限公司 | Secondary battery |
| WO2021060009A1 (en) * | 2019-09-26 | 2021-04-01 | 三洋電機株式会社 | Secondary battery and method for manufacturing same |
| WO2021124796A1 (en) * | 2019-12-19 | 2021-06-24 | パナソニック株式会社 | Non-aqueous electrolyte secondary battery |
| WO2021186947A1 (en) * | 2020-03-17 | 2021-09-23 | 三洋電機株式会社 | Non-aqueous electrolyte secondary battery |
| CN115039285A (en) * | 2020-03-17 | 2022-09-09 | 三洋电机株式会社 | Non-aqueous electrolyte secondary battery |
| WO2021192666A1 (en) * | 2020-03-26 | 2021-09-30 | 三洋電機株式会社 | Non-aqueous electrolyte secondary battery |
| WO2021192664A1 (en) * | 2020-03-26 | 2021-09-30 | 三洋電機株式会社 | Secondary battery |
| CN115280589A (en) * | 2020-03-26 | 2022-11-01 | 三洋电机株式会社 | Secondary battery |
| JP2022115110A (en) * | 2021-01-28 | 2022-08-09 | プライムプラネットエナジー＆ソリューションズ株式会社 | secondary battery |
| JP7304372B2 (en) | 2021-01-28 | 2023-07-06 | プライムプラネットエナジー＆ソリューションズ株式会社 | secondary battery |
| US12002998B2 (en) | 2021-01-28 | 2024-06-04 | Prime Planet Energy & Solutions, Inc. | Secondary battery |
| WO2023005408A1 (en) * | 2021-07-30 | 2023-02-02 | 宁德时代新能源科技股份有限公司 | Battery cell, battery and electric device |
| CN116014375A (en) * | 2023-02-09 | 2023-04-25 | 深圳海润新能源科技有限公司 | Energy storage device and electric equipment |
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