JP2020072019A - Manufacturing method of stacked cell - Google Patents

Manufacturing method of stacked cell Download PDF

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JP2020072019A
JP2020072019A JP2018205763A JP2018205763A JP2020072019A JP 2020072019 A JP2020072019 A JP 2020072019A JP 2018205763 A JP2018205763 A JP 2018205763A JP 2018205763 A JP2018205763 A JP 2018205763A JP 2020072019 A JP2020072019 A JP 2020072019A
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cutting
cutting blade
layer
electrode
electrode laminate
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JP7087920B2 (en
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正剛 藤嶋
Masatake Fujishima
正剛 藤嶋
佐藤　彰生
Akio Sato
彰生 佐藤
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Toyota Motor Corp
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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
    • 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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Abstract

To provide a manufacturing method of stacked cell capable of restraining short circuit.SOLUTION: A manufacturing method of stacked cell includes a step of cutting an electrode laminate, having a positive electrode layer, a negative electrode layer, and an isolating layer interposed between the positive electrode layer and the negative electrode layer, by means of a cutting blade. In the step of cutting, assuming the angle formed by the direction of travel of the cutting blade and the interlayer direction of the electrode laminate is θ, the thickness of the isolating layer is t, the amplitude of vibration generated in the cutting blade when cutting the electrode laminate is A, the angle formed by the direction of vibration generated in the cutting blade and the interlayer direction of the electrode laminate is θ, and the maximum burr dimensions when cutting the electrode laminate at θ=90° by means of the cutting blade is h, the cutting step satisfies the following formula (1). t>hsinθ+Asinθ... (1).SELECTED DRAWING: Figure 5

Description

本願は積層電池の製造方法を開示するものである。   This application discloses a method of manufacturing a laminated battery.

近年、電池に要求される出力を満足する電子伝導性及びイオン伝導性を確保するために活物質層の厚みを厚くし、さらに電池の容量密度を向上させるために集電箔及び絶縁層（電解質層）の厚みを極力薄くすることが求められている。しかしながら、絶縁層を薄くすると正極層と負極層との間の短絡が懸念される。そのため、図１のように正極活物質層及び負極活物質層の層間方向の長さよりも、絶縁層の層間方向の長さを長くし、絶縁性を向上させる積層構造（異径構造）とすることが一般的に採用されている。   In recent years, the thickness of the active material layer has been increased in order to secure the electronic conductivity and ionic conductivity that satisfy the output required for the battery, and further, in order to improve the capacity density of the battery, a collector foil and an insulating layer (electrolyte) It is required to make the thickness of the layer) as thin as possible. However, if the insulating layer is made thin, there is a fear of short circuit between the positive electrode layer and the negative electrode layer. Therefore, as shown in FIG. 1, the length in the interlayer direction of the insulating layer is made longer than the length in the interlayer direction of the positive electrode active material layer and the negative electrode active material layer to form a laminated structure (different diameter structure) that improves the insulating property. Is generally adopted.

一方で、図１のような積層電池では、集電箔が活物質層に接している面積のみ電池として機能するため、集電箔の層間方向の長さよりも外側に位置する部分は余剰であり、このような余剰部位の長さ（余剰寸法）が長くなるほど、電池の容量密度が低下する。そのため、図２に示されているように、余剰部位が切断され、全層同一な面積で積層されている電池（同径構造）が求められている。   On the other hand, in the laminated battery as shown in FIG. 1, only the area where the current collector foil is in contact with the active material layer functions as a battery, and therefore the portion located outside the length of the current collector foil in the interlayer direction is a surplus. As the length (excess dimension) of such an excess portion increases, the capacity density of the battery decreases. Therefore, as shown in FIG. 2, a battery (same diameter structure) in which surplus portions are cut and all layers are stacked in the same area is required.

特許文献１には、図２のような同径構造の積層電池の製造方法が開示されており、電極材料を積層しプレスした後に、積層体の端部を切断することにより積層電池を作製することが記載されている。また、切断方法については、積層体の積層方向に沿って切断することが記載されており、これにより加工時間を短縮することが図られている。
特許文献２にも、図２のような同径構造の積層電池の製造方法が開示されており、同文献には、切断部材の刃を層構造体の層方向に略平行な方向に移動させて層構造体を切断することにより、層構造体の電気的短絡を抑制できることが記載されている。 Patent Document 1 discloses a method for manufacturing a laminated battery having the same diameter structure as shown in FIG. 2. After laminating and pressing electrode materials, the laminated body is produced by cutting the end portions of the laminated body. Is described. As for the cutting method, it is described that the cutting is performed along the stacking direction of the stacked body, and thereby the processing time is shortened.
Patent Document 2 also discloses a method of manufacturing a laminated battery having the same diameter structure as shown in FIG. 2, in which the blade of the cutting member is moved in a direction substantially parallel to the layer direction of the layer structure. It is described that an electrical short circuit of the layered structure can be suppressed by cutting the layered structure with the use of.

特開２０００−９０９４０号公報JP 2000-90940 A 特開２００８−２０７６０号公報JP, 2008-20760, A

特許文献１に記載の方法では、積層体の積層方向に沿って切断することになるため、切断面に生じたバリや電極崩れが絶縁層を超えて正極層から負極層、又は負極層から正極層に延びてしまい、短絡する虞がある。
特許文献２に記載の方法では、切断部材の刃を層構造体の層方向に略平行な方向に移動させて層構造体を切断しているため、層構造体の電極間における短絡は抑制可能であるが、切断時間が長くなる問題が生じる。また、このような切断方法では、切断部材の刃の単位幅に対して掛かる力が大きくなり、切断部材の寿命に影響する問題がある。 In the method described in Patent Document 1, since cutting is performed along the stacking direction of the stacked body, burrs and electrode collapse generated on the cut surface exceed the insulating layer and the positive electrode layer to the negative electrode layer, or the negative electrode layer to the positive electrode. It may extend into the layer and cause a short circuit.
In the method described in Patent Document 2, since the blade of the cutting member is moved in a direction substantially parallel to the layer direction of the layer structure to cut the layer structure, a short circuit between the electrodes of the layer structure can be suppressed. However, there arises a problem that the cutting time becomes long. Further, in such a cutting method, the force applied to the unit width of the blade of the cutting member becomes large, and there is a problem that the life of the cutting member is affected.

そこで本願では、短絡を抑制することが可能な積層電池の製造方法を提供することを課題とする。   Therefore, an object of the present application is to provide a method of manufacturing a laminated battery capable of suppressing a short circuit.

本発明者らは、鋭意検討の結果、切断時の切り取り刃と電極積層体との関係を所定の式を満たすように設定することにより、切断時の短絡を抑制し、かつ、切断時間を低減することが可能なことを見出し、本発明を完成させた。   As a result of intensive studies, the inventors of the present invention suppress the short circuit at the time of cutting and reduce the cutting time by setting the relationship between the cutting blade and the electrode laminate at the time of cutting to satisfy a predetermined formula. The inventors have found that it is possible to complete the present invention.

すなわち、本願は上記した課題を解決するための一つの手段として、
正極層と、負極層と、正極層及び負極層の間に配置される絶縁層とを有する電極積層体を切り取り刃で切断する工程を備え、切断する工程は、切断時の切り取り刃の進行方向と電極積層体の層間方向との成す角をθ１、絶縁層の厚みをｔ、電極積層体を切断する際に切り取り刃に発生する振動の振幅をＡ、切り取り刃に発生する振動の方向と電極積層体の層間方向との成す角をθ２とし、さらに、θ１＝９０°において電極積層体を切り取り刃で切断したときの最大バリ崩れ寸法をｈとしたとき、
下記式（１）を満たすことを特徴とする、積層電池の製造方法を開示する。
ｔ＞ｈｓｉｎθ１＋Ａｓｉｎθ２・・・（１） That is, the present application, as one means for solving the above problems,
The method includes a step of cutting an electrode laminate having a positive electrode layer, a negative electrode layer, and an insulating layer arranged between the positive electrode layer and the negative electrode layer with a cutting blade, and the cutting step includes a traveling direction of the cutting blade at the time of cutting. The angle between the electrode laminate and the interlayer direction is θ 1 , the thickness of the insulating layer is t, the amplitude of vibration generated at the cutting blade when cutting the electrode laminate is A, and the direction of vibration generated at the cutting blade is When the angle formed between the electrode laminate and the interlayer direction is θ 2, and when the maximum crushing dimension when the electrode laminate is cut with a cutting blade at θ 1 = 90 ° is h,
Disclosed is a method for manufacturing a laminated battery, which satisfies the following formula (1).
t> hsin θ 1 + Asin θ 2 (1)

上記積層電池の製造方法によれば、電極積層体切断時の短絡を抑制することができる。また、電極積層体の層間方向に沿って切断した場合に比べて、切断時間を低減することができ、さらに切り取り刃の単位幅に対して掛かる力が小さくなるため、切り取り刃の寿命を延長させることができる。   According to the above method for manufacturing a laminated battery, it is possible to suppress a short circuit when the electrode laminate is cut. Further, compared with the case of cutting along the interlayer direction of the electrode laminate, the cutting time can be reduced, and the force applied to the unit width of the cutting blade is reduced, so that the life of the cutting blade is extended. be able to.

異径構造の積層電池の断面概略図である。It is a cross-sectional schematic diagram of the laminated battery of different diameter structure. 同径構造の積層電池の断面概略図である。It is a cross-sectional schematic diagram of the laminated battery of the same diameter structure. 積層電池の製造方法１０のフローチャートである。It is a flowchart of the manufacturing method 10 of a laminated battery. 電極積層体１の断面概略図である。It is a cross-sectional schematic diagram of the electrode laminated body 1. 切断工程Ｓ１の様子を説明する図である。It is a figure explaining the mode of cutting process S1. バリ崩れを説明する図である。It is a figure explaining a flash collapse.

本開示の積層電池の製造方法について、一実施形態である積層電池の製造方法１０（以下、「製造方法１０」ということがある。）を用いて説明する。   A method for manufacturing a laminated battery according to the present disclosure will be described using a method for manufacturing a laminated battery 10 (hereinafter, also referred to as “manufacturing method 10”) according to an embodiment.

＜製造方法１０＞
図３に示したとおり、製造方法１０は電極積層体１を切り取り刃で切断する切断工程Ｓ１を備えており、電極積層体１を切断することにより積層電池が製造される。
以下において、切断工程Ｓ１について詳しく説明するが、まずは電極積層体１から説明する。 <Manufacturing method 10>
As shown in FIG. 3, the manufacturing method 10 includes a cutting step S1 of cutting the electrode laminated body 1 with a cutting blade, and the laminated battery is manufactured by cutting the electrode laminated body 1.
Hereinafter, the cutting step S1 will be described in detail, but first, the electrode laminated body 1 will be described.

（電極積層体１）
電極積層体１は、正極層２と、負極層３と、正極層２及び負極層３の間に配置される絶縁層４とを有している。図４に電極積層体１の断面図を示した。
図４に示されているように、正極層２は正活物質層２ａと正極集電箔２ｂとを有し、正極活物質層２ａの面のうち絶縁層４が配置されている側とは反対側の面に正極集電箔２ｂが積層されている。負極層３も同様に、負極活物質層３ａと負極集電箔３ｂとを有し、負極活物質層３ａの面のうち絶縁層４が配置されている側とは反対側の面に負極集電箔３ｂが積層されている。
正極活物質層２ａ、正極集電箔２ｂ、負極活物質層３ａ、負極集電箔３ｂ、絶縁層４を構成する材料は、公知の材料を採用することができる。 (Electrode laminate 1)
The electrode stack 1 includes a positive electrode layer 2, a negative electrode layer 3, and an insulating layer 4 arranged between the positive electrode layer 2 and the negative electrode layer 3. FIG. 4 shows a sectional view of the electrode laminate 1.
As shown in FIG. 4, the positive electrode layer 2 has a positive active material layer 2a and a positive electrode current collector foil 2b, and the side of the positive electrode active material layer 2a on which the insulating layer 4 is arranged is The positive electrode current collector foil 2b is laminated on the opposite surface. Similarly, the negative electrode layer 3 also has a negative electrode active material layer 3a and a negative electrode current collector foil 3b, and a negative electrode collector is provided on the surface of the negative electrode active material layer 3a opposite to the side on which the insulating layer 4 is arranged. The electric foil 3b is laminated.
As a material forming the positive electrode active material layer 2a, the positive electrode current collector foil 2b, the negative electrode active material layer 3a, the negative electrode current collector foil 3b, and the insulating layer 4, known materials can be adopted.

以上、電極積層体１について説明したが、本開示の積層電池の製造方法に用いることができる電極積層体は、上記の電極積層体１に限定されず、公知の電極積層体の構造を採用することができる。
例えば、電極積層体１の積層構造の各層間に他の層が積層されていてもよい。また、図４の電極積層体１では正極層、負極層、絶縁層がそれぞれ１つずつ積層されている形態を示したが、これに限定されず、正極層、負極層、絶縁層が２つ以上積層されている形態であってもよい。さらに、図４の電極積層体１は異径構造であるが、これに限定されず、同径構造であってもよい。 Although the electrode laminate 1 has been described above, the electrode laminate that can be used in the method for manufacturing a laminated battery of the present disclosure is not limited to the electrode laminate 1 described above, and a known electrode laminate structure is adopted. be able to.
For example, another layer may be laminated between each layer of the laminated structure of the electrode laminate 1. Further, the electrode laminate 1 of FIG. 4 shows a mode in which one positive electrode layer, one negative electrode layer, and one insulating layer are laminated, but the present invention is not limited to this, and two positive electrode layers, two negative electrode layers, and two insulating layers are provided. It may be in the form of being laminated. Furthermore, although the electrode laminate 1 of FIG. 4 has a different diameter structure, the invention is not limited to this and may have the same diameter structure.

（切断工程Ｓ１）
次に切断工程Ｓ１について説明する。
切断工程Ｓ１は電極積層体１を切り取り刃５で切断する工程であり、切断時の切り取り刃５の進行方向と電極積層体１の層間方向との成す角をθ１、絶縁層４の厚みをｔ、電極積層体１を切断する際に切り取り刃５に発生する振動の振幅をＡ、切り取り刃５に発生する振動の方向と電極積層体１の層間方向との成す角をθ２とし、さらに、θ１＝９０°において電極積層体を切り取り刃５で切断したときの最大バリ崩れ寸法をｈとしたとき、下記式（１）を満たすことを特徴としている。
ｔ＞ｈｓｉｎθ１＋Ａｓｉｎθ２・・・（１） (Cutting step S1)
Next, the cutting step S1 will be described.
The cutting step S1 is a step of cutting the electrode laminated body 1 with the cutting blade 5. The angle formed by the traveling direction of the cutting blade 5 and the interlayer direction of the electrode laminated body 1 at the time of cutting is θ 1 , and the thickness of the insulating layer 4 is t, the amplitude of the vibration generated in the cutting blade 5 when the electrode laminated body 1 is cut is A, the angle between the direction of the vibration generated in the cutting blade 5 and the interlayer direction of the electrode laminated body 1 is θ 2 , and , Θ 1 = 90 °, the following formula (1) is satisfied, where h is the maximum size of collapse when the electrode laminate is cut by the cutting blade 5.
t> hsin θ 1 + Asin θ 2 (1)

以下、式（１）の各要素について、図５を用いて詳しく説明する。図５は切断工程Ｓ１において電極積層体１を切り取り刃５で切断する様子を示した図であり、図５に示されている電極積層体の図は図４のＶの方向から見た図である。   Hereinafter, each element of the formula (1) will be described in detail with reference to FIG. FIG. 5 is a view showing how the electrode laminate 1 is cut by the cutting blade 5 in the cutting step S1, and the view of the electrode laminate shown in FIG. 5 is a view seen from the direction V in FIG. is there.

図５に記載されているように、切断時の切り取り刃５の進行方向と電極積層体１の層間方向との成す角がθ１である。ここで「層間方向」とは、切断する電極積層体１の断面における電極積層体１の各層間の界面に沿った方向であり、具体的には切断する電極積層体１の断面における電極積層体１の積層方向に直交する方向である。角度θ１は０°＜θ１＜９０°であることが好ましい。
絶縁層４の厚みｔは、電極積層体１の積層方向における絶縁層４の長さである。
電極積層体１を切断する際に切り取り刃５に発生する振動の振幅Ａとは、例えば電極積層体１を切断する際に、超音波等を用いて切り取り刃５を振動させた場合の該振動の振幅である。
また、切り取り刃５に発生する振動方向と電極積層体１の層間方向との成す角がθ２である。角度θ２は０°＜θ２＜９０°であることが好ましい。なお、切り取り刃５に発生する振動の方向とは、上記超音波等によって発生する切り取り刃５の振動の方向である。図５には切り取り刃５が紙面左右方向に振動している例を示している。 As shown in FIG. 5, the angle between the advancing direction of the cutting blade 5 and the interlayer direction of the electrode laminate 1 at the time of cutting is θ 1 . Here, the “interlayer direction” is a direction along the interface between the layers of the electrode laminate 1 in the cross section of the electrode laminate 1 to be cut, and specifically, the electrode laminate in the cross section of the electrode laminate 1 to be cut. 1 is a direction orthogonal to the stacking direction. The angle θ 1 is preferably 0 ° <θ1 <90 °.
The thickness t of the insulating layer 4 is the length of the insulating layer 4 in the stacking direction of the electrode stack 1.
The amplitude A of the vibration generated in the cutting blade 5 when the electrode laminated body 1 is cut means, for example, the vibration when the cutting blade 5 is vibrated by using ultrasonic waves when the electrode laminated body 1 is cut. Is the amplitude of.
Further, the angle formed by the vibration direction generated in the cutting blade 5 and the interlayer direction of the electrode laminate 1 is θ 2 . The angle θ 2 is preferably 0 ° <θ 2 <90 °. The direction of vibration of the cutting blade 5 is the direction of vibration of the cutting blade 5 generated by the ultrasonic waves or the like. FIG. 5 shows an example in which the cutting blade 5 vibrates in the left-right direction on the paper surface.

また、θ１＝９０°において電極積層体を切り取り刃５で切断したときの最大バリ崩れ寸法ｈとは、切り取り刃５を電極積層体１の積層方向に沿った方向（θ１＝９０°）に進行させて電極積層体１を切断したときの最大バリ崩れ寸法ｈであり、切断工程Ｓ１の前に予め試験をして求めておくものである。
「バリ崩れ」とは、切断時における集電箔（正極集電箔、負極集電箔）のバリ、及び活物質層（正極活物質層、負極活物質層）の崩れの総称である。図６にバリ崩れを説明する図を示した。図６に示したように、電極積層体１を切断すると、このようなバリ崩れＡやバリ崩れＢが発生する場合がある。そして、例えばバリ崩れＢのように、正極活物質層２ａが絶縁層４を超えて負極活物質層３ａに接触すると電池が短絡する。このように、正極層２及び負極層３が絶縁層４を超えて接触すると、電池に短絡が発生する。切断工程Ｓ１では、このようなバリ崩れによる電池の短絡を抑制することができる。
ここで「バリ崩れ寸法」とは、絶縁層４の面のうち切り取り刃５に最初に接触する面を基準として、該基準からバリ崩れの先端までの積層方向の長さであり、「最大バリ崩れ寸法」とは、得られたバリ崩れ寸法のうち最大のものである。 Further, the maximum burr collapsed dimension h when cut in theta 1 = 90 ° the electrodes laminate cut blade 5, the direction (θ 1 = 90 °) along the cut edge 5 in the stacking direction of the electrode stack 1 It is the maximum burr collapse dimension h when the electrode laminated body 1 is cut by advancing to the above, and is obtained by performing a test in advance before the cutting step S1.
The "burr collapse" is a general term for burrs of the current collector foil (positive electrode current collector foil, negative electrode current collector foil) at the time of cutting and collapse of the active material layer (positive electrode active material layer, negative electrode active material layer). FIG. 6 shows a diagram for explaining the collapse. As shown in FIG. 6, when the electrode laminated body 1 is cut, such a burrs collapse A and a burrs collapse B may occur. When the positive electrode active material layer 2a exceeds the insulating layer 4 and comes into contact with the negative electrode active material layer 3a, as in the case of the collapse B, the battery is short-circuited. In this way, when the positive electrode layer 2 and the negative electrode layer 3 contact each other beyond the insulating layer 4, a short circuit occurs in the battery. In the cutting step S1, it is possible to suppress a short circuit of the battery due to such collapse.
Here, the "burr collapse dimension" is the length in the stacking direction from the reference to the tip of the barrack, based on the surface of the surface of the insulating layer 4 that comes into contact with the cutting blade 5 as a reference. The "collapse dimension" is the largest of the obtained burr collapse dimensions.

以上に説明した要素を、式（１）を満たすように設定することにより、電極積層体１を切断する際の短絡を抑制することができる。理由は次のとおりである。
式（１）のｈｓｉｎθ１は切り取り刃５の進行によるバリ崩れの絶縁層の厚み方向成分（積層方向成分）の最大寸法を表している。Ａｓｉｎθ２は、切り取り刃５の振動によるバリ崩れの絶縁層の厚み方向成分の最大寸法を表している。振動の影響によって発生するバリ崩れが、切り取り刃５の振動範囲よりも広い範囲で発生しないためである。よって、ｈｓｉｎθ１、Ａｓｉｎθ２の和は切断によって発生する、絶縁層の厚み方向成分のバリ崩れ寸法の最大値を表している。そのため、これらの和が絶縁層の厚みｔよりも小さくなることにより、必ずバリ崩れ寸法よりも絶縁層の厚みが厚くなることから、バリ崩れが起きたとしても、正極層２及び負極層３が接触することが抑制される。従って、製造方法１０によれば、積層電池の短絡を抑制することが可能となる。 By setting the elements described above so as to satisfy the formula (1), it is possible to suppress a short circuit when the electrode laminate 1 is cut. The reason is as follows.
In equation (1), hsin θ 1 represents the maximum dimension of the component in the thickness direction (component in the stacking direction) of the insulating layer that is caused by the movement of the cutting blade 5. Asin θ 2 represents the maximum dimension of the component in the thickness direction of the insulating layer that is caused by the vibration of the cutting blade 5 due to vibration. This is because the burr collapse caused by the vibration does not occur in a range wider than the vibration range of the cutting blade 5. Therefore, the sum of hsin θ 1 and Asin θ 2 represents the maximum value of the collapse dimension of the component in the thickness direction of the insulating layer generated by cutting. Therefore, since the sum of these is smaller than the thickness t of the insulating layer, the thickness of the insulating layer is always larger than the size of the breakdown, so that even if the breakdown occurs, the positive electrode layer 2 and the negative electrode layer 3 are Contact is suppressed. Therefore, according to the manufacturing method 10, it is possible to suppress a short circuit of the laminated battery.

また、製造方法１０によれば、電極積層体１の層間方向に沿って切断した場合に比べて、切断時間を低減することができ、さらに切り取り刃５の単位幅に対して掛かる力が小さくなるため、切り取り刃５の寿命を延長させることができる。   Further, according to the manufacturing method 10, the cutting time can be reduced and the force applied to the unit width of the cutting blade 5 can be reduced as compared with the case where the electrode laminate 1 is cut along the interlayer direction. Therefore, the life of the cutting blade 5 can be extended.

なお、式（１）においてＡｓｉｎθ２の項は０であってもよい。すなわち、切り取り刃５は電極積層体１の切断時に振動していなくてもよい。この場合であっても、上記の効果を奏することが、発明者らによって確認されている。切り取り刃５を振動させる理由は、切断性向上のためである。このような切り取り刃５としては、超音波カッター等を挙げることができる。 Note that the term of Asin θ 2 in the formula (1) may be 0. That is, the cutting blade 5 does not have to vibrate when the electrode laminate 1 is cut. Even in this case, it has been confirmed by the present inventors that the above-mentioned effects are exhibited. The reason why the cutting blade 5 is vibrated is to improve the cuttability. Examples of such a cutting blade 5 include an ultrasonic cutter.

また、電極積層体１を切断する部位は特に限定されないが、電極積層体１が図４のように余剰部位を有する場合、当該余剰部位が無くなるように切断することが好ましい。   Moreover, although the site | part which cut | disconnects the electrode laminated body 1 is not specifically limited, when the electrode laminated body 1 has an excess site | part like FIG. 4, it is preferable to cut so that the said excess site | part may be lost.

さらに、切断工程Ｓ１は、電極積層体１の切断を１回のみ行っても良く、複数回行ってもよい。   Further, in the cutting step S1, the electrode laminate 1 may be cut only once or plural times.

１ 電極積層体
２ 正極層
２ａ 正極活物質層
２ｂ 正極集電箔
３ 負極層
３ａ 負極活物質層
３ｂ 負極集電箔
４ 絶縁層
５ 切り取り刃 DESCRIPTION OF SYMBOLS 1 Electrode laminated body 2 Positive electrode layer 2a Positive electrode active material layer 2b Positive electrode current collector foil 3 Negative electrode layer 3a Negative electrode active material layer 3b Negative electrode current collector foil 4 Insulating layer 5 Cutting blade

Claims (1)

正極層と、負極層と、前記正極層及び前記負極層の間に配置される絶縁層とを有する電極積層体を切り取り刃で切断する工程を備え、
前記切断する工程は、
切断時の前記切り取り刃の進行方向と前記電極積層体の層間方向との成す角をθ１、前記絶縁層の厚みをｔ、前記電極積層体を切断する際に前記切り取り刃に発生する振動の振幅をＡ、前記切り取り刃に発生する前記振動の方向と前記電極積層体の前記層間方向との成す角をθ２とし、
さらに、θ１＝９０°において前記電極積層体を前記切り取り刃で切断したときの最大バリ崩れ寸法をｈとしたとき、
下記式（１）を満たすことを特徴とする、
積層電池の製造方法。
ｔ＞ｈｓｉｎθ１＋Ａｓｉｎθ２・・・（１） A step of cutting an electrode laminate having a positive electrode layer, a negative electrode layer, and an insulating layer arranged between the positive electrode layer and the negative electrode layer with a cutting blade,
The cutting step includes
The angle formed by the advancing direction of the cutting blade and the interlayer direction of the electrode laminate at the time of cutting is θ 1 , the thickness of the insulating layer is t, and the vibration generated in the cutting blade when the electrode laminate is cut The amplitude is A, the angle formed by the direction of the vibration generated in the cutting blade and the interlayer direction of the electrode laminate is θ 2 ,
Further, when θ 1 = 90 ° and the maximum flash collapse dimension when the electrode laminate is cut by the cutting blade is h,
Characterized by satisfying the following formula (1),
Manufacturing method of laminated battery.
t> hsin θ 1 + Asin θ 2 (1)
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JP2017062871A (en) * 2015-09-21 2017-03-30 トヨタ自動車株式会社 Method and device for manufacturing electrode body

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CN111760958A (en) * 2020-06-22 2020-10-13 骆驼集团新能源电池有限公司 Pole piece cutting and manufacturing process of lithium ion soft package battery
CN114824505A (en) * 2022-04-06 2022-07-29 苏州时代华景新能源有限公司 Manufacturing process and production line system for zero deformation of winding type battery
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