JP2018190508A - Inspection method of power storage device - Google Patents
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- JP2018190508A JP2018190508A JP2017089727A JP2017089727A JP2018190508A JP 2018190508 A JP2018190508 A JP 2018190508A JP 2017089727 A JP2017089727 A JP 2017089727A JP 2017089727 A JP2017089727 A JP 2017089727A JP 2018190508 A JP2018190508 A JP 2018190508A
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000007689 inspection Methods 0.000 title abstract description 20
- 238000005259 measurement Methods 0.000 claims abstract description 12
- 238000010030 laminating Methods 0.000 abstract description 4
- 238000003475 lamination Methods 0.000 abstract 3
- 229910052751 metal Inorganic materials 0.000 description 14
- 239000002184 metal Substances 0.000 description 14
- 239000011888 foil Substances 0.000 description 13
- 239000011149 active material Substances 0.000 description 5
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 239000007773 negative electrode material Substances 0.000 description 3
- 239000007774 positive electrode material Substances 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Electric Double-Layer Capacitors Or The Like (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
Abstract
Description
本発明は、正極タブを有する正極電極と負極タブを有する負極電極とを積層した電極組立体を備える蓄電装置の検査方法に関する。 The present invention relates to an inspection method for a power storage device including an electrode assembly in which a positive electrode having a positive electrode tab and a negative electrode having a negative electrode tab are stacked.
従来から、ＥＶ（Electric Vehicle）やＰＨＶ（Plug in Hybrid Vehicle）などの車両には、電動機など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やニッケル水素二次電池などが搭載されている。二次電池は、シート状の正極電極及び負極電極をシート状のセパレータを介して積層した電極組立体と、該電極組立体を収容する直方体状及び金属製のケースとを備える（例えば、特許文献１参照）。正極電極及び負極電極は、集電体としての金属箔と、該金属箔の両面又は片面に存在する活物質層とを備える。正極電極及び負極電極は、金属箔の一辺の一部から突出した形状のタブを有する。 Conventionally, vehicles such as EVs (Electric Vehicles) and PHVs (Plug in Hybrid Vehicles) have been mounted with lithium-ion secondary batteries or nickel-hydrogen secondary batteries as power storage devices that store power supplied to electric motors and the like. . A secondary battery includes an electrode assembly in which a sheet-like positive electrode and a negative electrode are stacked via a sheet-like separator, and a rectangular parallelepiped and metal case that accommodates the electrode assembly (for example, Patent Documents). 1). Each of the positive electrode and the negative electrode includes a metal foil as a current collector and an active material layer present on both surfaces or one surface of the metal foil. The positive electrode and the negative electrode have a tab having a shape protruding from a part of one side of the metal foil.
ところで、このような電極組立体では、正極電極及び負極電極が金属箔の一辺に沿う方向（幅方向）にずれて積層されることがある。積層ずれが生じた電極組立体では、例えば、正極電極の活物質層の全面がセパレータを介して負極電極の活物質層に対向しなくなることで、二次電池におけるエネルギ密度が低下してしまう。このため、電極組立体において正極電極及び負極電極が積層ずれしているか否かを判定する二次電池の検査が行われている。例えば、特許文献１では、負極電極に形成された孔と正極電極を収納するセパレータに形成された孔の位置によって積層ずれを判定している。しかしながら、この方法では、負極電極及びセパレータに検査用の孔を形成しなければならず、二次電池の製造工程が煩雑になる。 By the way, in such an electrode assembly, the positive electrode and the negative electrode may be stacked while being displaced in a direction (width direction) along one side of the metal foil. In the electrode assembly in which the stacking deviation has occurred, for example, the entire surface of the active material layer of the positive electrode is not opposed to the active material layer of the negative electrode via the separator, thereby reducing the energy density in the secondary battery. For this reason, the secondary battery is inspected to determine whether or not the positive electrode and the negative electrode are misaligned in the electrode assembly. For example, in Patent Document 1, the stacking deviation is determined based on the positions of the holes formed in the negative electrode and the holes formed in the separator housing the positive electrode. However, in this method, inspection holes must be formed in the negative electrode and the separator, and the manufacturing process of the secondary battery becomes complicated.
本発明は、上記課題を解決するためになされたものであり、その目的は、電極組立体における正極電極及び負極電極の積層ずれを容易に判定できる蓄電装置の検査方法を提供することにある。 The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a method for inspecting a power storage device that can easily determine the misalignment between the positive electrode and the negative electrode in an electrode assembly.
上記問題点を解決するための蓄電装置の検査方法は、シート状の複数の正極電極及び負極電極が絶縁された状態で交互に積層されるとともに、前記正極電極の一辺の一部から突出した形状の正極タブが積層された正極タブ群、及び前記負極電極の一辺の一部から突出した形状の負極タブが積層された負極タブ群を有する電極組立体を備えた蓄電装置の検査方法であって、前記正極電極の一辺に沿う方向と前記負極電極の一辺に沿う方向とを一致させて幅方向とし、前記電極組立体を積層方向から見た側面視において、前記幅方向に互いに対向する前記正極タブ群の前記幅方向の一端面と前記負極タブ群の前記幅方向の一端面との距離を第１距離として測定し、前記正極タブ群の前記幅方向の他端面と前記負極タブ群の前記幅方向の他端面との距離を第２距離として測定する測定工程と、前記第１距離及び前記第２距離に基づいて、前記電極組立体における前記正極電極及び前記負極電極の前記幅方向への積層ずれを判定する判定工程と、を含むことを要旨とする。 A method for inspecting a power storage device for solving the above problem is a shape in which a plurality of sheet-like positive electrodes and negative electrodes are alternately stacked in a state of being insulated and protruded from a part of one side of the positive electrode A method for inspecting a power storage device comprising a positive electrode tab group in which positive electrode tabs are stacked and a negative electrode tab group in which negative electrode tabs having a shape protruding from a part of one side of the negative electrode electrode are stacked. The positive electrodes that face each other in the width direction in a side view when the electrode assembly is viewed from the laminating direction are made to coincide with a direction along one side of the positive electrode and a direction along one side of the negative electrode. The distance between the one end surface in the width direction of the tab group and the one end surface in the width direction of the negative electrode tab group is measured as a first distance, and the other end surface in the width direction of the positive electrode tab group and the negative tab group With the other end in the width direction A measurement step of measuring separation as a second distance, and a determination step of determining stacking displacement in the width direction of the positive electrode and the negative electrode in the electrode assembly based on the first distance and the second distance It is a summary to include.
電極組立体において複数の正極電極及び負極電極のうち一部の正極電極や負極電極が幅方向に積層ずれしている場合、積層ずれしていない場合と比べて、第１距離が短くなったり、第２距離が長くなったりする。例えば、積層ずれしていない場合の第１距離と測定された第１距離との差の絶対値、及び積層ずれしていない場合の第２距離と測定された第２距離との差の絶対値の少なくとも一方が、正極タブ２３及び負極タブ３３の幅方向の寸法の公差の絶対値より大きい場合、電極組立体において正極電極及び負極電極が積層ずれしていると判定する。このように電極組立体において正極電極が有する正極タブ及び負極電極が有する負極タブを利用して第１距離及び第２距離を測定し、正極電極及び負極電極の幅方向への積層ずれを判定することにより、蓄電装置を検査することができる。この場合、正極電極や負極電極に対して検査用の加工等を施す必要が無く、電極組立体における正極電極及び負極電極の幅方向への積層ずれを容易に判定できる。 In the electrode assembly, when some of the positive electrodes and negative electrodes out of the plurality of positive electrodes and negative electrodes are misaligned in the width direction, the first distance is shorter than when the stack is not misaligned, The second distance becomes longer. For example, the absolute value of the difference between the first distance and the measured first distance when there is no stacking deviation, and the absolute value of the difference between the second distance and the measured second distance when there is no stacking deviation Is larger than the absolute value of the tolerance of the dimension in the width direction of the positive electrode tab 23 and the negative electrode tab 33, it is determined that the positive electrode and the negative electrode are misaligned in the electrode assembly. As described above, in the electrode assembly, the first distance and the second distance are measured using the positive electrode tab of the positive electrode and the negative electrode tab of the negative electrode, and the stacking deviation in the width direction of the positive electrode and the negative electrode is determined. Thus, the power storage device can be inspected. In this case, it is not necessary to perform inspection processing or the like on the positive electrode or the negative electrode, and the stacking deviation in the width direction of the positive electrode and the negative electrode in the electrode assembly can be easily determined.
また、上記蓄電装置の検査方法について、前記測定工程は、前記電極組立体の側面視の投影を用いて行われるのが好ましい。
これによれば、電極組立体を積層方向から見た側面視の投影を用いることで、電極組立体が存在する部分が暗い領域となり、存在しない部分が明るい領域となる。このため、投影を用いない場合と比較して、電極組立体が存在する部分と存在しない部分との境界、すなわち正極タブ群及び負極タブ群の一端面及び他端面の位置を精度良く特定することができる。よって、第１距離及び第２距離を精度良く測定でき、電極組立体における正極電極及び負極電極の幅方向への積層ずれの検査の精度を向上できる。
In the method for inspecting the power storage device, it is preferable that the measurement step is performed using a side view projection of the electrode assembly.
According to this, by using the projection in a side view when the electrode assembly is viewed from the stacking direction, a portion where the electrode assembly is present is a dark region, and a portion where the electrode assembly is not present is a bright region. Therefore, compared with the case where no projection is used, the boundary between the portion where the electrode assembly is present and the portion where the electrode assembly is not present, that is, the positions of the one end surface and the other end surface of the positive electrode tab group and the negative electrode tab group are specified with high accuracy. Can do. Therefore, the first distance and the second distance can be measured with high accuracy, and the accuracy of the inspection of the stacking deviation in the width direction of the positive electrode and the negative electrode in the electrode assembly can be improved.
本発明によれば、電極組立体における正極電極及び負極電極の積層ずれを容易に判定できる。 According to the present invention, it is possible to easily determine the stacking deviation between the positive electrode and the negative electrode in the electrode assembly.
以下、蓄電装置の検査方法を二次電池の検査方法に具体化した一実施形態を図１〜図４にしたがって説明する。
図１に示すように、蓄電装置としての二次電池１０は、ケース１１を備える。二次電池１０は、ケース１１に収容された電極組立体１２を備える。ケース１１は、直方体状のケース本体１３と、ケース本体１３の開口部１３ａを閉塞する矩形平板状の蓋１４とを有する。ケース１１を構成するケース本体１３と蓋１４は、何れも金属製（例えば、ステンレスやアルミニウム）である。また、本実施形態の二次電池１０は、その外観が角型をなす角型電池である。また、本実施形態の二次電池１０は、リチウムイオン電池である。
Hereinafter, an embodiment in which a method for inspecting a power storage device is embodied as a method for inspecting a secondary battery will be described with reference to FIGS.
As shown in FIG. 1, a secondary battery 10 as a power storage device includes a case 11. The secondary battery 10 includes an electrode assembly 12 accommodated in a case 11. The case 11 includes a rectangular parallelepiped case main body 13 and a rectangular flat lid 14 that closes the opening 13 a of the case main body 13. Both the case main body 13 and the lid 14 constituting the case 11 are made of metal (for example, stainless steel or aluminum). Further, the secondary battery 10 of the present embodiment is a prismatic battery whose appearance is square. Further, the secondary battery 10 of the present embodiment is a lithium ion battery.
二次電池１０は、電極組立体１２から電気を取り出すための正極端子１５と負極端子１６を備える。正極端子１５と負極端子１６は、蓋１４に所定の間隔をあけて並設された一対の孔１４ａからケース１１の外部に露出される。また、正極端子１５及び負極端子１６には、ケース１１から絶縁するためのリング状の絶縁リング１７がそれぞれ取り付けられている。 The secondary battery 10 includes a positive electrode terminal 15 and a negative electrode terminal 16 for taking out electricity from the electrode assembly 12. The positive electrode terminal 15 and the negative electrode terminal 16 are exposed to the outside of the case 11 through a pair of holes 14 a arranged in parallel with the lid 14 at a predetermined interval. Further, a ring-shaped insulating ring 17 for insulating from the case 11 is attached to each of the positive terminal 15 and the negative terminal 16.
図２に示すように、電極組立体１２は、シート状の複数の正極電極２０と負極電極３０とセパレータ４０とを備える。電極組立体１２は、正極電極２０と負極電極３０との間にセパレータ４０を介在させ、かつ相互に絶縁させた状態で積層した層状構造を備える。 As shown in FIG. 2, the electrode assembly 12 includes a plurality of sheet-like positive electrodes 20, negative electrodes 30, and separators 40. The electrode assembly 12 has a layered structure in which separators 40 are interposed between the positive electrode 20 and the negative electrode 30 and are laminated in a mutually insulated state.
正極電極２０は、矩形シート状の集電体としての正極金属箔（例えばアルミニウム箔）２１と、正極金属箔２１の両面に存在する正極活物質層２２とを有する。正極電極２０は、一対の長辺に沿う縁部のうちの一方の縁部に第１縁部２０ａを備え、第１縁部２０ａの対辺となる他方の縁部に第２縁部２０ｂを備える。さらに、正極電極２０は、第１縁部２０ａと第２縁部２０ｂ同士を繋ぐ一対の短辺に沿う縁部のうちの一方の縁部に第３縁部２０ｃを備え、第３縁部２０ｃの対辺となる他方の縁部に第４縁部２０ｄを備える。以下、第１縁部２０ａ及び第２縁部２０ｂに沿う方向を正極電極２０の幅方向とし、第３縁部２０ｃ及び第４縁部２０ｄに沿う方向を正極電極２０の高さ方向として説明する。また、幅方向において、第３縁部２０ｃ側を幅方向一方とし、第４縁部２０ｄ側を幅方向他方とする。 The positive electrode 20 includes a positive metal foil (for example, an aluminum foil) 21 as a rectangular sheet-shaped current collector, and a positive electrode active material layer 22 present on both surfaces of the positive metal foil 21. The positive electrode 20 includes a first edge 20a on one edge of the pair of long sides, and a second edge 20b on the other edge that is the opposite side of the first edge 20a. . Further, the positive electrode 20 includes a third edge 20c on one edge of a pair of short edges connecting the first edge 20a and the second edge 20b, and the third edge 20c. A fourth edge portion 20d is provided on the other edge portion which is the opposite side. Hereinafter, the direction along the first edge 20a and the second edge 20b will be described as the width direction of the positive electrode 20, and the direction along the third edge 20c and the fourth edge 20d will be described as the height direction of the positive electrode 20. . In the width direction, the third edge 20c side is one side in the width direction, and the fourth edge 20d side is the other side in the width direction.
正極電極２０は、第１縁部２０ａの一部から高さ方向に突出した矩形状の正極タブ２３を有する。正極タブ２３は、正極活物質層２２が存在せず、正極金属箔２１そのもので構成されている。正極タブ２３は、第１縁部２０ａの幅方向中央からずれた位置に存在する。本実施形態の正極タブ２３は、第１縁部２０ａの幅方向中央から幅方向一方にずれた位置に存在する。正極タブ２３は、幅方向に向かい合う一対の縁部のうち、幅方向中央に近い一方の縁部に内側縁部２３ａを備え、他方の縁部に外側縁部２３ｂを備える。 The positive electrode 20 has a rectangular positive electrode tab 23 protruding in the height direction from a part of the first edge portion 20a. The positive electrode tab 23 is composed of the positive electrode metal foil 21 itself without the positive electrode active material layer 22. The positive electrode tab 23 exists at a position shifted from the center in the width direction of the first edge portion 20a. The positive electrode tab 23 of this embodiment exists in the position shifted | deviated from the width direction center of the 1st edge part 20a to the width direction one side. The positive electrode tab 23 includes an inner edge portion 23a at one edge portion close to the center in the width direction, and an outer edge portion 23b at the other edge portion, out of a pair of edge portions facing in the width direction.
負極電極３０は、矩形シート状の集電体としての負極金属箔（例えば銅箔）３１と、負極金属箔３１の両面に存在する負極活物質層３２とを有する。負極電極３０は、一対の長辺に沿う縁部のうちの一方の縁部に第１縁部３０ａを備え、第１縁部３０ａの対辺となる他方の縁部に第２縁部３０ｂを備える。さらに、負極電極３０は、第１縁部３０ａと第２縁部３０ｂ同士を繋ぐ一対の短辺に沿う縁部のうちの一方の縁部に第３縁部３０ｃを備え、第３縁部３０ｃの対辺となる他方の縁部に第４縁部３０ｄを備える。以下、第１縁部３０ａ及び第２縁部３０ｂに沿う方向を負極電極３０の幅方向とし、第３縁部３０ｃ及び第４縁部３０ｄに沿う方向を負極電極３０の高さ方向として説明する。また、幅方向において、第３縁部３０ｃ側を幅方向一方とし、第４縁部３０ｄ側を幅方向他方とする。 The negative electrode 30 includes a negative electrode metal foil (for example, a copper foil) 31 as a rectangular sheet-shaped current collector, and negative electrode active material layers 32 present on both surfaces of the negative electrode metal foil 31. The negative electrode 30 includes a first edge 30a on one edge of the pair of long edges, and a second edge 30b on the other edge that is the opposite side of the first edge 30a. . Further, the negative electrode 30 includes a third edge 30c on one edge of the pair of short edges connecting the first edge 30a and the second edge 30b, and the third edge 30c. A fourth edge 30d is provided on the other edge opposite to the other edge. Hereinafter, the direction along the first edge 30a and the second edge 30b will be described as the width direction of the negative electrode 30, and the direction along the third edge 30c and the fourth edge 30d will be described as the height direction of the negative electrode 30. . In the width direction, the third edge 30c side is one side in the width direction, and the fourth edge 30d side is the other side in the width direction.
負極電極３０は、第１縁部３０ａの一部から高さ方向に突出した矩形状の負極タブ３３を有する。負極タブ３３は、負極活物質層３２が存在せず、負極金属箔３１そのもので構成されている。負極タブ３３は、第１縁部３０ａの幅方向中央からずれた位置に存在する。本実施形態の負極タブ３３は、第１縁部３０ａの幅方向中央から幅方向他方にずれた位置に存在する。負極タブ３３は、幅方向に向かい合う一対の縁部のうち、幅方向中央に近い一方の縁部に内側縁部３３ａを備え、他方の縁部に外側縁部３３ｂを備える。 The negative electrode 30 has a rectangular negative electrode tab 33 protruding in the height direction from a part of the first edge 30a. The negative electrode tab 33 is composed of the negative electrode metal foil 31 itself without the negative electrode active material layer 32. The negative electrode tab 33 exists at a position shifted from the center in the width direction of the first edge portion 30a. The negative electrode tab 33 of the present embodiment exists at a position shifted from the center in the width direction of the first edge portion 30a to the other in the width direction. The negative electrode tab 33 includes an inner edge portion 33a at one edge portion close to the center in the width direction, and an outer edge portion 33b at the other edge portion, out of a pair of edge portions facing in the width direction.
セパレータ４０は、矩形シート状の絶縁性材料からなる。セパレータ４０は、正極電極２０と負極電極３０とを絶縁する。セパレータ４０は、一対の長辺に沿う縁部のうちの一方の縁部に第１縁部４０ａを備え、第１縁部４０ａの対辺となる他方の縁部に第２縁部４０ｂを備える。また、セパレータ４０は、第１縁部４０ａと第２縁部４０ｂ同士を繋ぐ一対の短辺に沿う縁部のうちの一方の縁部に第３縁部４０ｃを備え、第３縁部４０ｃの対辺となる他方の縁部に第４縁部４０ｄを備える。 The separator 40 is made of a rectangular sheet-like insulating material. The separator 40 insulates the positive electrode 20 and the negative electrode 30 from each other. The separator 40 includes a first edge 40a at one of the edges along the pair of long sides, and a second edge 40b at the other edge that is the opposite side of the first edge 40a. In addition, the separator 40 includes a third edge 40c on one edge of the pair of short edges connecting the first edge 40a and the second edge 40b, and the third edge 40c. A fourth edge 40d is provided on the other edge that is the opposite side.
図４（ａ）に示すように、負極電極３０の第１縁部３０ａの長さは、正極電極２０の第１縁部２０ａの長さより長く、負極電極３０の第２縁部３０ｂの長さは、正極電極２０第２縁部２０ｂの長さより長い。さらに、負極電極３０の第３縁部３０ｃの長さは、正極電極２０の第３縁部２０ｃの長さより長く、負極電極３０の第４縁部３０ｄの長さは、正極電極２０の第４縁部２０ｄの長さより長い。つまり、負極電極３０の外形は、正極電極２０の外形より一回り大きい。 As shown in FIG. 4A, the length of the first edge 30a of the negative electrode 30 is longer than the length of the first edge 20a of the positive electrode 20, and the length of the second edge 30b of the negative electrode 30. Is longer than the length of the second edge 20b of the positive electrode 20. Further, the length of the third edge 30 c of the negative electrode 30 is longer than the length of the third edge 20 c of the positive electrode 20, and the length of the fourth edge 30 d of the negative electrode 30 is the fourth length of the positive electrode 20. It is longer than the length of the edge 20d. That is, the outer shape of the negative electrode 30 is slightly larger than the outer shape of the positive electrode 20.
また、セパレータ４０の第１縁部４０ａの長さは、負極電極３０の第１縁部３０ａの長さと等しく、セパレータ４０の第２縁部４０ｂの長さは、負極電極３０の第２縁部３０ｂの長さと等しい。さらに、セパレータ４０の第３縁部４０ｃの長さは、負極電極３０の第３縁部３０ｃの長さと等しく、セパレータ４０の第４縁部４０ｄの長さは、負極電極３０の第４縁部３０ｄの長さと等しい。つまり、セパレータ４０の外形は、正極電極２０の外形より一回り大きく、負極電極３０の外形と等しい大きさである。 The length of the first edge 40 a of the separator 40 is equal to the length of the first edge 30 a of the negative electrode 30, and the length of the second edge 40 b of the separator 40 is the second edge of the negative electrode 30. It is equal to the length of 30b. Further, the length of the third edge 40 c of the separator 40 is equal to the length of the third edge 30 c of the negative electrode 30, and the length of the fourth edge 40 d of the separator 40 is the fourth edge of the negative electrode 30. Equal to 30d length. That is, the outer shape of the separator 40 is slightly larger than the outer shape of the positive electrode 20 and is equal to the outer shape of the negative electrode 30.
積層ずれが生じていない電極組立体１２を積層方向から見たとき、正極電極２０の第１縁部２０ａ及び第２縁部２０ｂは、高さ方向において負極電極３０及びセパレータ４０の第１縁部３０ａ，４０ａ及び第２縁部３０ｂ，４０ｂよりも内側に位置する。また、正極電極２０の第３縁部２０ｃ及び第４縁部２０ｄは、幅方向において負極電極３０及びセパレータ４０の第３縁部３０ｃ，４０ｃ及び第４縁部３０ｄ，４０ｄよりも内側に位置する。 When the electrode assembly 12 in which no stacking deviation occurs is viewed from the stacking direction, the first edge portion 20a and the second edge portion 20b of the positive electrode 20 are connected to the first edge portion of the negative electrode 30 and the separator 40 in the height direction. 30a, 40a and the 2nd edge part 30b, 40b are located inside. Further, the third edge portion 20c and the fourth edge portion 20d of the positive electrode 20 are positioned inside the third edge portions 30c, 40c and the fourth edge portions 30d, 40d of the negative electrode 30 and the separator 40 in the width direction. .
図１に示すように、各正極電極２０は、それぞれの正極タブ２３が電極組立体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る。電極組立体１２は、積層方向の一端から他端までの範囲の正極タブ２３が集められた正極タブ群１８を備える。正極タブ群１８には、正極端子１５が電気的に接合される。図４（ａ）に示すように、正極タブ群１８は、幅方向の一端面としての内側端面１８ａと、幅方向の他端面としての外側端面１８ｂとを備える。内側端面１８ａは、幅方向において負極タブ群１９と対向している。 As shown in FIG. 1, each positive electrode 20 is stacked such that the respective positive electrode tabs 23 are arranged in a row along the stacking direction of the electrode assembly 12. The electrode assembly 12 includes a positive electrode tab group 18 in which positive electrode tabs 23 in a range from one end to the other end in the stacking direction are collected. The positive electrode terminal 15 is electrically joined to the positive electrode tab group 18. As shown in FIG. 4A, the positive electrode tab group 18 includes an inner end face 18a as one end face in the width direction and an outer end face 18b as the other end face in the width direction. The inner end face 18a faces the negative electrode tab group 19 in the width direction.
同様に、図１に示すように、各負極電極３０は、それぞれの負極タブ３３が電極組立体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る。また、電極組立体１２は、積層方向の一端から他端までの範囲の負極タブ３３が集められた負極タブ群１９を備える。負極タブ群１９は、幅方向において正極タブ群１８と異なる位置に存在する。負極タブ群１９には、負極端子１６が電気的に接続される。図４（ａ）に示すように、負極タブ群１９は、幅方向の一端面としての内側端面１９ａと、幅方向の他端面としての外側端面１９ｂとを備える。内側端面１９ａは、幅方向において正極タブ群１８の内側端面１８ａと対向している。 Similarly, as shown in FIG. 1, each negative electrode 30 is stacked such that the respective negative electrode tabs 33 are arranged in a row along the stacking direction of the electrode assembly 12. The electrode assembly 12 includes a negative electrode tab group 19 in which negative electrode tabs 33 in a range from one end to the other end in the stacking direction are collected. The negative electrode tab group 19 exists at a position different from the positive electrode tab group 18 in the width direction. A negative electrode terminal 16 is electrically connected to the negative electrode tab group 19. As shown in FIG. 4A, the negative electrode tab group 19 includes an inner end face 19a as one end face in the width direction and an outer end face 19b as the other end face in the width direction. The inner end surface 19a faces the inner end surface 18a of the positive electrode tab group 18 in the width direction.
図４（ａ）及び図４（ｃ）に示すように、正極電極２０及び負極電極３０に幅方向への積層ずれがない電極組立体１２の場合、正極タブ群１８の内側端面１８ａは、正極タブ２３の内側縁部２３ａが積層されて構成され、外側端面１８ｂは、正極タブ２３の外側縁部２３ｂが積層されて構成される。同様に、負極タブ群１９の内側端面１９ａは、負極タブ３３の内側縁部３３ａが積層されて構成され、外側端面１９ｂは、負極タブ３３の外側縁部３３ｂが積層されて構成される。電極組立体１２を積層方向から見た側面視において、正極タブ群１８の内側端面１８ａと負極タブ群１９の内側端面１９ａとの幅方向の距離を第１距離Ａとし、正極タブ群１８の外側端面１８ｂと負極タブ群１９の外側端面１９ｂとの幅方向の距離を第２距離Ｂとする。全ての正極電極２０及び負極電極３０に積層ずれがない電極組立体１２の場合の第１及び第２距離Ａ，Ｂを第１及び第２基準距離Ａ０，Ｂ０とする。 As shown in FIG. 4A and FIG. 4C, in the case of the electrode assembly 12 in which the positive electrode 20 and the negative electrode 30 are not misaligned in the width direction, the inner end face 18a of the positive electrode tab group 18 is The inner edge portion 23a of the tab 23 is laminated, and the outer end surface 18b is constituted of the outer edge portion 23b of the positive electrode tab 23 being laminated. Similarly, the inner end surface 19a of the negative electrode tab group 19 is configured by stacking the inner edge portion 33a of the negative electrode tab 33, and the outer end surface 19b is configured by stacking the outer edge portion 33b of the negative electrode tab 33. In a side view of the electrode assembly 12 as viewed from the stacking direction, the distance in the width direction between the inner end surface 18a of the positive electrode tab group 18 and the inner end surface 19a of the negative electrode tab group 19 is defined as a first distance A, and the outer side of the positive electrode tab group 18 A distance in the width direction between the end face 18 b and the outer end face 19 b of the negative electrode tab group 19 is defined as a second distance B. The first and second distances A and B in the case of the electrode assembly 12 in which all the positive electrodes 20 and the negative electrodes 30 are not misaligned are defined as first and second reference distances A0 and B0.
一方、図４（ｂ）及び図４（ｄ）に示す電極組立体１２ａでは、複数の正極電極２０のうち１枚の正極電極２００が幅方向一方にずれた状態で積層されている。この場合、正極タブ群１８の内側端面１８ａは、ずれている正極電極２００を除く他の正極電極２０の正極タブ２３の内側縁部２３ａが積層されて構成され、外側端面１８ｂは、ずれている正極電極２００の正極タブ２３の外側縁部２３ｂによって構成される。負極タブ群１９の内側端面１９ａは、負極タブ３３の内側縁部３３ａが積層されて構成され、外側端面１９ｂは、負極タブ３３の外側縁部３３ｂが積層されて構成される。つまり、正極タブ群１８の内側端面１８ａと負極タブ群１９の内側端面１９ａ及び外側端面１９ｂの幅方向の位置は、積層ずれがない電極組立体１２の場合と同じ位置になる。一方、正極タブ群１８の外側端面１８ｂは、積層ずれがない電極組立体１２の場合よりも幅方向外側（幅方向一方）に位置する。第１距離Ａ１は第１基準距離Ａ０と同じ長さになり、第２距離Ｂ１は第２基準距離Ｂ０よりも長くなる。なお、正極タブ２３の幅方向の寸法に公差が存在し、負極タブ３３の幅方向の寸法に公差が存在しないと想定した場合、第２距離Ｂ１と第２基準距離Ｂ０との差の絶対値は、正極タブ２３の幅方向の寸法の公差の絶対値よりも大きくなる。 On the other hand, in the electrode assembly 12a shown in FIG. 4B and FIG. 4D, one positive electrode 200 among the plurality of positive electrodes 20 is stacked in a state shifted to one side in the width direction. In this case, the inner end face 18a of the positive electrode tab group 18 is configured by laminating inner edge portions 23a of the positive electrode tabs 23 of the other positive electrodes 20 excluding the displaced positive electrode 200, and the outer end face 18b is displaced. The outer edge 23 b of the positive electrode tab 23 of the positive electrode 200 is configured. The inner end surface 19 a of the negative electrode tab group 19 is configured by stacking the inner edge portion 33 a of the negative electrode tab 33, and the outer end surface 19 b is configured by stacking the outer edge portion 33 b of the negative electrode tab 33. That is, the positions in the width direction of the inner end face 18a of the positive electrode tab group 18 and the inner end face 19a and the outer end face 19b of the negative electrode tab group 19 are the same positions as those of the electrode assembly 12 with no stacking deviation. On the other hand, the outer end face 18b of the positive electrode tab group 18 is positioned on the outer side in the width direction (one in the width direction) than in the case of the electrode assembly 12 with no stacking deviation. The first distance A1 is the same length as the first reference distance A0, and the second distance B1 is longer than the second reference distance B0. When it is assumed that there is a tolerance in the dimension in the width direction of the positive electrode tab 23 and no tolerance in the dimension in the width direction of the negative electrode tab 33, the absolute value of the difference between the second distance B1 and the second reference distance B0. Is larger than the absolute value of the tolerance of the dimension in the width direction of the positive electrode tab 23.
なお、図示しないが、複数の正極電極２０のうち１枚の正極電極２００が幅方向他方にずれた状態で積層されている場合、正極タブ群１８の内側端面１８ａは、ずれている正極電極２００の正極タブ２３の内側縁部２３ａによって構成される。正極タブ群１８の外側端面１８ｂは、ずれている正極電極２００を除く他の正極電極２０の正極タブ２３の外側縁部２３ｂが積層されて構成される。負極タブ群１９の内側端面１９ａは、負極タブ３３の内側縁部３３ａが積層されて構成され、外側端面１９ｂは、負極タブ３３の外側縁部３３ｂが積層されて構成される。つまり、正極タブ群１８の外側端面１８ｂと負極タブ群１９の内側端面１９ａ及び外側端面１９ｂの位置は、積層ずれがない電極組立体１２の場合と同じ位置になる。一方、正極タブ群１８の内側端面１８ａは、積層ずれがない電極組立体１２の場合よりも幅方向内側（幅方向他方）に位置する。第２距離Ｂは第２基準距離Ｂ０と同じ長さになり、第１距離Ａは第１基準距離Ａ０よりも短くなる。なお、正極タブ２３の幅方向に公差が存在し、負極タブ３３の幅方向の寸法に公差が存在しないと想定した場合、第１距離Ａと第１基準距離Ａ０との差の絶対値は、正極タブ２３の幅方向の寸法の公差の絶対値よりも大きくなる。 Although not shown, when one positive electrode 200 of the plurality of positive electrodes 20 is stacked in a state shifted to the other in the width direction, the inner end face 18a of the positive electrode tab group 18 is shifted from the positive electrode 200. It is comprised by the inner edge part 23a of the positive electrode tab 23 of this. The outer end face 18b of the positive electrode tab group 18 is configured by laminating the outer edge 23b of the positive electrode tab 23 of the other positive electrode 20 excluding the shifted positive electrode 200. The inner end surface 19 a of the negative electrode tab group 19 is configured by stacking the inner edge portion 33 a of the negative electrode tab 33, and the outer end surface 19 b is configured by stacking the outer edge portion 33 b of the negative electrode tab 33. That is, the positions of the outer end face 18b of the positive electrode tab group 18 and the inner end face 19a and the outer end face 19b of the negative electrode tab group 19 are the same positions as those of the electrode assembly 12 with no stacking deviation. On the other hand, the inner end face 18a of the positive electrode tab group 18 is located on the inner side in the width direction (the other in the width direction) than in the case of the electrode assembly 12 with no stacking deviation. The second distance B has the same length as the second reference distance B0, and the first distance A is shorter than the first reference distance A0. When it is assumed that there is a tolerance in the width direction of the positive electrode tab 23 and no tolerance in the dimension in the width direction of the negative electrode tab 33, the absolute value of the difference between the first distance A and the first reference distance A0 is It becomes larger than the absolute value of the tolerance of the dimension in the width direction of the positive electrode tab 23.
次に、正極電極２０及び負極電極３０の幅方向への積層ずれを検査する電極組立体１２の検査方法について説明する。
電極組立体１２の検査工程は、正極電極２０、負極電極３０、及びセパレータ４０を積層した後に行われる。図３に示すように、検査工程は、搬送路Ｒ上に配置された電極組立体１２を搬送しながら行う。電極組立体１２は、積層方向が搬送方向と直交するように搬送路Ｒ上に配置されている。検査工程は、形状取得工程、測定工程、及び判定工程を含む。検査工程は、検査装置５０によって行われる。
Next, an inspection method of the electrode assembly 12 that inspects the stacking deviation in the width direction of the positive electrode 20 and the negative electrode 30 will be described.
The inspection process of the electrode assembly 12 is performed after the positive electrode 20, the negative electrode 30, and the separator 40 are stacked. As shown in FIG. 3, the inspection process is performed while transporting the electrode assembly 12 disposed on the transport path R. The electrode assembly 12 is disposed on the transport path R so that the stacking direction is orthogonal to the transport direction. The inspection process includes a shape acquisition process, a measurement process, and a determination process. The inspection process is performed by the inspection apparatus 50.
形状取得工程は、積層方向から見た電極組立体１２の形状を取得する工程である。形状取得工程には、検査装置５０の投光部５１及びＣＣＤカメラ５２が用いられる。投光部５１は、搬送路Ｒの下方に配置され、ＣＣＤカメラ５２は、搬送路Ｒの上方に配置される。投光部５１とＣＣＤカメラ５２は、搬送路Ｒを挟んで、電極組立体１２の積層方向に対向配置されている。投光部５１は、電極組立体１２が搬送路Ｒの所定の位置まで搬送されると、電極組立体１２全体に向けて投光する。搬送路Ｒには光が透過可能な材料が用いられている。よって、投光された光は搬送路Ｒを透過した後、その一部が電極組立体１２によって遮られる。このとき、ＣＣＤカメラ５２は、電極組立体１２とその周辺を撮影することで投影画像を取得する。投影画像において、電極組立体１２が存在する部分は暗い領域（図４（ａ）及び図４（ｂ）のドット部分参照）、電極組立体１２が存在しない部分は明るい領域となる。これにより、電極組立体１２の側面視の形状を取得できる。 The shape acquisition step is a step of acquiring the shape of the electrode assembly 12 viewed from the stacking direction. In the shape acquisition process, the light projecting unit 51 and the CCD camera 52 of the inspection apparatus 50 are used. The light projecting unit 51 is disposed below the transport path R, and the CCD camera 52 is disposed above the transport path R. The light projecting unit 51 and the CCD camera 52 are arranged to face each other in the stacking direction of the electrode assembly 12 with the conveyance path R interposed therebetween. When the electrode assembly 12 is transported to a predetermined position on the transport path R, the light projecting unit 51 projects light toward the entire electrode assembly 12. The transport path R is made of a material that can transmit light. Therefore, the projected light passes through the transport path R, and a part thereof is blocked by the electrode assembly 12. At this time, the CCD camera 52 acquires a projection image by photographing the electrode assembly 12 and its periphery. In the projected image, a portion where the electrode assembly 12 is present is a dark region (see the dot portions in FIGS. 4A and 4B), and a portion where the electrode assembly 12 is not present is a bright region. Thereby, the shape of the electrode assembly 12 in a side view can be acquired.
測定工程は、電極組立体１２の正極タブ群１８と負極タブ群１９との第１距離Ａ及び第２距離Ｂを測定する工程である。測定工程は、検査装置５０の測定部５３によって行われる。測定部５３には、ＣＣＤカメラ５２が接続され、電極組立体１２の投影画像が送信される。測定部５３は、電極組立体１２の投影画像を用いて第１距離Ａ及び第２距離Ｂを測定する。 The measuring step is a step of measuring the first distance A and the second distance B between the positive electrode tab group 18 and the negative electrode tab group 19 of the electrode assembly 12. The measurement process is performed by the measurement unit 53 of the inspection device 50. A CCD camera 52 is connected to the measurement unit 53 and a projection image of the electrode assembly 12 is transmitted. The measurement unit 53 measures the first distance A and the second distance B using the projection image of the electrode assembly 12.
判定工程は、測定工程で測定された第１距離Ａ及び第２距離Ｂに基づいて、正極電極２０及び負極電極３０の積層ずれを判定する工程である。判定工程は、検査装置５０の判定部５４によって行われる。判定部５４には、測定部５３が接続され、第１距離Ａ及び第２距離Ｂの測定結果が送信される。判定部５４は、測定された第１距離Ａと予め設定された第１基準距離Ａ０とを比較する。また、判定部５４は、測定された第２距離Ｂと予め設定された第２基準距離Ｂ０とを比較する。判定部５４は、第１距離Ａと第１基準距離Ａ０との差の絶対値、及び第２距離Ｂと第２基準距離Ｂ０との差の絶対値の少なくとも一方が、正極タブ２３及び負極タブ３３の幅方向の寸法の公差の絶対値よりも大きい場合、電極組立体１２において正極電極２０及び負極電極３０が幅方向へ積層ずれしていると判定する。判定部５４は、第１距離Ａと第１基準距離Ａ０との差の絶対値、及び第２距離Ｂと第２基準距離Ｂ０との差の絶対値が、正極タブ２３及び負極タブ３３の幅方向の寸法の公差の絶対値以下の場合、電極組立体１２において正極電極２０及び負極電極３０が幅方向へ積層ずれしていないと判定する。なお、判定工程において、積層ずれしていると判定された電極組立体１２は、図示しない他の搬送路へと送られる。 The determination step is a step of determining the stacking deviation between the positive electrode 20 and the negative electrode 30 based on the first distance A and the second distance B measured in the measurement step. The determination process is performed by the determination unit 54 of the inspection apparatus 50. The determination unit 54 is connected to the measurement unit 53, and the measurement results of the first distance A and the second distance B are transmitted. The determination unit 54 compares the measured first distance A with a preset first reference distance A0. The determination unit 54 compares the measured second distance B with a preset second reference distance B0. The determination unit 54 determines that at least one of the absolute value of the difference between the first distance A and the first reference distance A0 and the absolute value of the difference between the second distance B and the second reference distance B0 is the positive electrode tab 23 and the negative electrode tab. If the absolute value of the dimension tolerance in the width direction 33 is larger than the absolute value, it is determined in the electrode assembly 12 that the positive electrode 20 and the negative electrode 30 are misaligned in the width direction. The determination unit 54 determines that the absolute value of the difference between the first distance A and the first reference distance A0 and the absolute value of the difference between the second distance B and the second reference distance B0 are the widths of the positive electrode tab 23 and the negative electrode tab 33. When the absolute value of the dimensional tolerance is less than the absolute value, it is determined in the electrode assembly 12 that the positive electrode 20 and the negative electrode 30 are not misaligned in the width direction. In the determination step, the electrode assembly 12 that is determined to be out of stack is sent to another conveyance path (not shown).
次に、本実施形態の作用を記載する。
上述したように、複数の正極電極２０のうち１枚の正極電極２００が幅方向外側にずれた状態で積層されている場合、積層ずれしていない電極組立体１２の場合と比較して、第２距離Ｂ１が第２基準距離Ｂ０よりも長くなる。また、複数の正極電極２０のうち１枚の正極電極２００が幅方向内側にずれた状態で積層されている場合、積層ずれしていない電極組立体１２の場合と比較して、第１距離Ａが第１基準距離Ａ０よりも短くなる。第２距離Ｂ１と第２基準距離Ｂ０との差の絶対値、及び第１距離Ａと第１基準距離Ａ０との差の絶対値が、正極タブ２３及び負極タブ３３の幅方向の寸法の公差の絶対値以下の場合、積層ずれしていないと判定し、正極タブ２３及び負極タブ３３の幅方向の寸法の公差の絶対値よりも大きい場合、積層ずれしていると判定する。このように第１距離Ａ及び第２距離Ｂを測定することにより、電極組立体１２における正極電極２０及び負極電極３０の幅方向への積層ずれを判定する。
Next, the operation of this embodiment will be described.
As described above, when one positive electrode 200 of the plurality of positive electrodes 20 is stacked in a state of being shifted outward in the width direction, compared to the case of the electrode assembly 12 that is not stacked and shifted, The two distances B1 are longer than the second reference distance B0. In addition, when one positive electrode 200 of the plurality of positive electrodes 20 is stacked in a state of being shifted inward in the width direction, the first distance A is compared with the case of the electrode assembly 12 that is not stacked and shifted. Becomes shorter than the first reference distance A0. The absolute value of the difference between the second distance B1 and the second reference distance B0 and the absolute value of the difference between the first distance A and the first reference distance A0 are the tolerances of the dimensions of the positive electrode tab 23 and the negative electrode tab 33 in the width direction. If the absolute value of the positive electrode tab 23 and the negative electrode tab 33 is larger than the absolute value of the tolerance in the width direction, it is determined that the stacking has shifted. By measuring the first distance A and the second distance B in this manner, the stacking deviation in the width direction of the positive electrode 20 and the negative electrode 30 in the electrode assembly 12 is determined.
次に、本実施形態の効果を記載する。
（１）複数の正極電極２０及び負極電極３０のうち一部の正極電極２０や負極電極３０が幅方向に積層ずれしていると判定された電極組立体１２の場合、積層ずれしていないと判定された電極組立体１２の場合と比べて、第１距離Ａが短くなったり、第２距離Ｂが長くなったりする。このように正極電極２０が有する正極タブ２３及び負極電極３０が有する負極タブ３３を利用して第１距離Ａ及び第２距離Ｂを測定し、正極電極２０及び負極電極３０の幅方向への積層ずれを判定することにより、二次電池１０を検査できる。この場合、正極電極２０や負極電極３０に対して検査用の加工等を施す必要が無く、電極組立体１２における正極電極２０及び負極電極３０の幅方向への積層ずれを容易に判定できる。
Next, the effect of this embodiment will be described.
(1) In the case of the electrode assembly 12 in which a part of the positive electrodes 20 and the negative electrodes 30 among the plurality of positive electrodes 20 and negative electrodes 30 are determined to be misaligned in the width direction, Compared to the determined electrode assembly 12, the first distance A becomes shorter or the second distance B becomes longer. Thus, the first distance A and the second distance B are measured using the positive electrode tab 23 of the positive electrode 20 and the negative electrode tab 33 of the negative electrode 30, and the positive electrode 20 and the negative electrode 30 are stacked in the width direction. By determining the deviation, the secondary battery 10 can be inspected. In this case, there is no need to perform inspection processing or the like on the positive electrode 20 or the negative electrode 30, and the stacking deviation in the width direction of the positive electrode 20 and the negative electrode 30 in the electrode assembly 12 can be easily determined.
（２）電極組立体１２を積層方向から見た側面視の投影画像では、電極組立体１２が存在する部分が暗い領域となり、存在しない部分が明るい領域となる。このため、投影を用いない場合と比較して、電極組立体１２が存在する部分と存在しない部分の境界、すなわち正極タブ群１８及び負極タブ群１９の内側端面１８ａ，１９ａ及び外側端面１８ｂ，１９ｂの位置を精度良く特定することができる。よって、第１距離Ａ及び第２距離Ｂを精度良く測定でき、電極組立体１２における正極電極２０及び負極電極３０の幅方向への積層ずれの検査の精度を向上できる。 (2) In the projection image in a side view when the electrode assembly 12 is viewed from the stacking direction, a portion where the electrode assembly 12 is present is a dark region, and a portion where the electrode assembly 12 is not present is a bright region. Therefore, as compared with the case where no projection is used, the boundary between the portion where the electrode assembly 12 is present and the portion where the electrode assembly 12 is not present, that is, the inner end surfaces 18a and 19a and the outer end surfaces 18b and 19b of the positive electrode tab group 18 and the negative electrode tab group 19. Can be accurately identified. Therefore, the first distance A and the second distance B can be measured with high accuracy, and the accuracy of the inspection of misalignment in the width direction of the positive electrode 20 and the negative electrode 30 in the electrode assembly 12 can be improved.
なお、上記実施形態は、以下のように変更してもよい。
○ 正極電極２０は、正極金属箔２１の片面に正極活物質層２２が存在する構造でもよい。同様に、負極電極３０は、負極金属箔３１の片面に負極活物質層３２が存在する構成でもよい。
In addition, you may change the said embodiment as follows.
The positive electrode 20 may have a structure in which the positive electrode active material layer 22 exists on one side of the positive electrode metal foil 21. Similarly, the negative electrode 30 may be configured such that the negative electrode active material layer 32 exists on one surface of the negative electrode metal foil 31.
○ 負極電極３０の外形は、正極電極２０の外形と同じ大きさ、又は正極電極２０の外形より小さくてもよい。
○ セパレータ４０の外形は、正極電極２０及び負極電極３０のうち外形が大きい方の電極の外形より大きくてもよい。
The outer shape of the negative electrode 30 may be the same size as the outer shape of the positive electrode 20 or smaller than the outer shape of the positive electrode 20.
The outer shape of the separator 40 may be larger than the outer shape of the larger electrode of the positive electrode 20 and the negative electrode 30.
○ 電極組立体１２は、複数の正極電極２０と複数の負極電極３０とをセパレータ４０を介して交互に積層した構造であったが、電極組立体１２の構造はこれに限定されない。例えば、電極組立体１２は、正極電極を収納した電極収納セパレータと負極電極とを交互に積層した構造であってもよい。ただし、正極電極の正極タブは、電極収納セパレータに収納されず、電極収納セパレータから突出した状態にある。 The electrode assembly 12 has a structure in which a plurality of positive electrodes 20 and a plurality of negative electrodes 30 are alternately stacked via separators 40, but the structure of the electrode assembly 12 is not limited to this. For example, the electrode assembly 12 may have a structure in which electrode storage separators that store positive electrodes and negative electrodes are alternately stacked. However, the positive electrode tab of the positive electrode is not housed in the electrode housing separator and is in a state of protruding from the electrode housing separator.
○ 正極タブ群１８及び負極タブ群１９の幅方向の位置は適宜変更してよい。ただし、正極タブ群１８と負極タブ群１９とが幅方向で重ならないようにする。
○ 上記実施形態では、電極組立体１２を積層方向から見た側面視の投影画像を用いて第１距離Ａ及び第２距離Ｂを測定したが、測定方法は限定されず、第１距離Ａ及び第２距離Ｂを測定できれば他の方法であってもよい。例えば、電極組立体１２の側面視の投影をスクリーンに映し、スクリーン上で第１距離Ａ及び第２距離Ｂを測定してもよい。また、実物の電極組立体１２を用いて、第１距離Ａ及び第２距離Ｂを実測してもよい。
The positions in the width direction of the positive electrode tab group 18 and the negative electrode tab group 19 may be changed as appropriate. However, the positive electrode tab group 18 and the negative electrode tab group 19 should not overlap in the width direction.
In the above embodiment, the first distance A and the second distance B are measured using a projection image in a side view when the electrode assembly 12 is viewed from the stacking direction, but the measurement method is not limited, and the first distance A and Other methods may be used as long as the second distance B can be measured. For example, the projection of the electrode assembly 12 in a side view may be projected on a screen, and the first distance A and the second distance B may be measured on the screen. Alternatively, the first distance A and the second distance B may be measured using the actual electrode assembly 12.
○ 上記実施形態では、電極組立体１２において正極電極２０のみが幅方向に積層ずれしている例を挙げたが、負極電極３０のみ又は正極電極２０及び負極電極３０の両方が幅方向に積層ずれしている場合についても、第１距離Ａ及び第２距離Ｂを測定することにより、幅方向の積層ずれを判定できる。 In the above embodiment, an example in which only the positive electrode 20 is misaligned in the width direction in the electrode assembly 12 has been given, but only the negative electrode 30 or both the positive electrode 20 and the negative electrode 30 are misaligned in the width direction. Even in the case where the first and second distances are measured, the stacking deviation in the width direction can be determined by measuring the first distance A and the second distance B.
○ 上記実施形態では、電極組立体１２において複数の正極電極２０のうち１枚の正極電極２０が幅方向に積層ずれしている例を挙げたが、複数の正極電極２０が幅方向に積層ずれしている場合についても、第１距離Ａ及び第２距離Ｂを測定することにより、幅方向の積層ずれを判定できる。なお、積層ずれの量が正極電極２０ごとに異なる場合、ずれ量の最も大きい正極電極２０における正極タブ２３の内側縁部２３ａ又は外側縁部２３ｂが正極タブ群１８の内側端面１８ａ又は外側端面１８ｂとなる。また、例えば、全ての正極電極２０が幅方向外側に積層ずれしている場合、第１距離Ａは第１基準距離Ａ０よりも長くなり、かつ第２距離Ｂは第２基準距離Ｂ０よりも長くなる。全ての正極電極２０が幅方向内側に積層ずれしている場合、第１距離Ａは第１基準距離Ａ０よりも短くなり、かつ第２距離Ｂは第２基準距離Ｂ０よりも短くなる。 In the above embodiment, an example in which one positive electrode 20 out of the plurality of positive electrodes 20 in the electrode assembly 12 is misaligned in the width direction has been given, but the plurality of positive electrodes 20 are misaligned in the width direction. Even in the case where the first and second distances are measured, the stacking deviation in the width direction can be determined by measuring the first distance A and the second distance B. When the amount of misalignment differs for each positive electrode 20, the inner edge 23a or the outer edge 23b of the positive electrode tab 23 in the positive electrode 20 having the largest deviation is the inner end surface 18a or outer end surface 18b of the positive electrode tab group 18. It becomes. In addition, for example, when all the positive electrodes 20 are misaligned outward in the width direction, the first distance A is longer than the first reference distance A0, and the second distance B is longer than the second reference distance B0. Become. When all the positive electrodes 20 are stacked and displaced inward in the width direction, the first distance A is shorter than the first reference distance A0, and the second distance B is shorter than the second reference distance B0.
○ 二次電池１０は、リチウムイオン二次電池でもよいし、他の二次電池であってもよい。要は、正極用の活物質と負極用の活物質との間をイオンが移動するとともに電荷の授受を行うものであればよい。 The secondary battery 10 may be a lithium ion secondary battery or another secondary battery. In short, any ion may be used as long as ions move between the active material for the positive electrode and the active material for the negative electrode and charge is transferred.
○ 蓄電装置は、例えばキャパシタなど、二次電池以外の蓄電装置にも適用可能である。
次に、上記実施形態から把握できる技術的思想を、その効果とともに記載する。
The power storage device can also be applied to power storage devices other than secondary batteries, such as capacitors.
Next, the technical idea that can be grasped from the above embodiment will be described together with the effects thereof.
（イ）前記正極電極の外形は、前記負極電極の外形よりも小さく、前記正極電極及び前記負極電極の一辺と直交する辺に沿う方向を高さ方向とすると、前記電極組立体を積層方向から見た側面視において、前記正極電極は、前記負極電極の全ての縁部よりも幅方向内側及び高さ方向内側に位置し、前記正極タブは、前記負極電極の一辺よりも高さ方向外側に位置する蓄電装置の検査方法。 (A) The external shape of the positive electrode is smaller than the external shape of the negative electrode, and when the direction along the side perpendicular to one side of the positive electrode and the negative electrode is defined as the height direction, the electrode assembly is removed from the stacking direction. In the viewed side view, the positive electrode is located on the inner side in the width direction and the inner side in the height direction than all the edges of the negative electrode, and the positive electrode tab is on the outer side in the height direction than one side of the negative electrode. An inspection method of a power storage device located.
これによれば、電極組立体を積層方向から見た側面視において、正極電極の全ての縁部は、負極電極によって視認できない状態にあるため、正極電極の縁部を利用して積層ずれを判定することは困難である。したがって、負極電極の縁部よりも高さ方向外側に位置する正極タブを利用して第１距離及び第２距離を測定することで、電極組立体における正極電極及び負極電極の幅方向の積層ずれを容易に判定できる。 According to this, in the side view of the electrode assembly viewed from the stacking direction, since all the edges of the positive electrode are not visible by the negative electrode, the misalignment is determined using the edges of the positive electrode. It is difficult to do. Accordingly, by measuring the first distance and the second distance using the positive electrode tab located on the outer side in the height direction from the edge of the negative electrode, the stacking displacement in the width direction of the positive electrode and the negative electrode in the electrode assembly is measured. Can be easily determined.
１０…蓄電装置としての二次電池、１２…電極組立体、１８…正極タブ群、１８ａ…一端面としての内側端面、１８ｂ…他端面としての外側端面、１９…負極タブ群、１９ａ…一端面としての内側端面、１９ｂ…他端面としての外側端面、２０…正極電極、２３…正極タブ、３０…負極電極、３３…負極タブ、Ａ…第１距離、Ｂ…第２距離。 DESCRIPTION OF SYMBOLS 10 ... Secondary battery as a power storage device, 12 ... Electrode assembly, 18 ... Positive electrode tab group, 18a ... Inner end face as one end face, 18b ... Outer end face as other end face, 19 ... Negative electrode tab group, 19a ... One end face An inner end face, 19b ... an outer end face as the other end face, 20 ... a positive electrode, 23 ... a positive electrode tab, 30 ... a negative electrode, 33 ... a negative electrode tab, A ... a first distance, B ... a second distance.
Claims (2)
前記正極電極の一辺の一部から突出した形状の正極タブが積層された正極タブ群、及び前記負極電極の一辺の一部から突出した形状の負極タブが積層された負極タブ群を有する電極組立体を備えた蓄電装置の検査方法であって、
前記正極電極の一辺に沿う方向と前記負極電極の一辺に沿う方向とを一致させて幅方向とし、
前記電極組立体を積層方向から見た側面視において、前記幅方向に互いに対向する前記正極タブ群の前記幅方向の一端面と前記負極タブ群の前記幅方向の一端面との距離を第１距離として測定し、前記正極タブ群の前記幅方向の他端面と前記負極タブ群の前記幅方向の他端面との距離を第２距離として測定する測定工程と、
前記第１距離及び前記第２距離に基づいて、前記電極組立体における前記正極電極及び前記負極電極の前記幅方向への積層ずれを判定する判定工程と、
を含むことを特徴とする蓄電装置の検査方法。 A plurality of sheet-like positive electrodes and negative electrodes are alternately stacked in an insulated state,
An electrode set having a positive electrode tab group in which a positive electrode tab having a shape protruding from a part of one side of the positive electrode is laminated, and a negative electrode tab group in which a negative electrode tab having a shape protruding from a part of one side of the negative electrode is laminated. A method for inspecting a power storage device including a three-dimensional object,
The direction along the one side of the positive electrode and the direction along the one side of the negative electrode are matched to form a width direction,
In a side view of the electrode assembly viewed from the stacking direction, a distance between one end surface in the width direction of the positive electrode tab group facing each other in the width direction and one end surface in the width direction of the negative electrode tab group is a first distance. Measuring as a distance, and measuring the distance between the other end surface in the width direction of the positive electrode tab group and the other end surface in the width direction of the negative electrode tab group as a second distance;
A determination step of determining a stacking deviation in the width direction of the positive electrode and the negative electrode in the electrode assembly based on the first distance and the second distance;
A method for inspecting a power storage device, comprising:
The method for inspecting a power storage device according to claim 1, wherein the measurement step is performed using a side view projection of the electrode assembly.
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