Manufacturing method of electrode laminate

Abstract

To provide a manufacturing method for an electrode laminate that makes it easy to inspect the end faces of the electrode laminate for chips and other defects in the resin during a manufacturing process.SOLUTION: A manufacturing method disclosed herein is a manufacturing method for an electrode laminate for an all-solid-state battery, and includes the steps of: providing an electrode laminate precursor; applying a resin material containing a colorant that reflects a laser beam to an end face excluding corners, of the electrode laminate precursor; and inspecting a thickness of the resin material applied to the end face by irradiating a laser using the corners of the end face as a reference.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to a method for manufacturing an electrode stack. [Background technology]

[0002] Patent Document 1 discloses a laminated electrode body for an all-solid-state battery, in which a plurality of electrode bodies are stacked, each of which has a first electrode, a solid electrolyte layer, a second electrode, and a second current collector arranged in this order on both sides of a first current collector, and the electrode bodies have protruding portions that protrude outward from the side surfaces of the electrode bodies, and the respective protruding portions have a phase difference when viewed in the stacking direction. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-117018 Summary of the Invention [Problem to be solved by the invention]

[0004] In the manufacturing process of an electrode stack in which the end faces are fixed with resin, it is required to inspect with high precision whether there are any defective products in which the resin is missing or the like.

[0005] An object of the present disclosure is to provide a method for manufacturing an electrode stack that can easily inspect the end faces of the electrode stack for chipping or the like of the resin during the manufacturing process. [Means for solving the problem]

[0006] The present inventors have found that the above object can be achieved by the following means: A method for manufacturing an electrode stack for an all-solid-state battery, comprising: providing an electrode stack precursor; applying a resin material containing a colorant that reflects a laser to a portion of the end surface of the electrode laminate precursor excluding the corners; inspecting the thickness of the resin material applied to the end surface by irradiating a laser with a corner of the end surface as a reference; A method for manufacturing an electrode stack, comprising: [Effects of the Invention]

[0007] According to the present disclosure, it is possible to provide a method for manufacturing an electrode stack that can easily inspect the end faces of the electrode stack for chipping or the like of the resin during the manufacturing process. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1(a) is a side view of an electrode laminate precursor 1 on which a current collecting element 3 is laminated, and FIG. 1(b) is a top view of FIG. 1(a). [Figure 2] FIG. 2(a) is a side view of the electrode laminate precursor 1 undergoing an inspection method different from the inspection method in the manufacturing method of the present disclosure, and FIG. 2(b) is a top view of FIG. 2(a). [Figure 3] FIG. 3 is a top view of the electrode stack precursor 1 undergoing the inspection method in the manufacturing method of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments of the present disclosure will be described in detail. Note that the present disclosure is not limited to the following embodiments, and various modifications can be made within the scope of the present disclosure.

[0010] The manufacturing method disclosed herein is a method for manufacturing an electrode laminate for an all-solid-state battery, and includes providing an electrode laminate precursor, applying a resin material containing a colorant that reflects a laser to a portion of an end face of the electrode laminate precursor excluding the corners, and inspecting the thickness of the resin material applied to the end face by irradiating a laser with the corners of the end face as a reference.

[0011] Fig. 1(a) is a side view of an electrode laminate precursor 1 on which a current collecting element 3 is laminated, and Fig. 1(b) is a top view of Fig. 1(a). In a configuration in which the current collecting element 3, for example, a current collecting foil, is disposed on the upper surface of the electrode laminate precursor 1, if the ends of the layers constituting the electrode laminate precursor 1 are not aligned, for example, a protruding portion 3a of the current collecting element 3 may come into contact with a part of the layer constituting the electrode laminate precursor 1, potentially causing a short circuit. From the viewpoint of preventing such short circuits, it is conceivable to cover the end faces of the electrode laminate precursor 1 with a resin material 2 as shown in Fig. 1 to prevent the current collecting element 3 from coming into contact with the layers constituting the electrode laminate precursor 1.

[0012] However, if the end faces of the electrode laminate precursor 1 are not sufficiently covered with the resin material 2, short circuits may not be sufficiently prevented.

[0013] Therefore, it is conceivable to inspect the thickness of the resin material 2 at the end face of the electrode laminate precursor 1 to check for chips, such as chips in the resin material or areas that are extremely thin compared to other areas.

[0014] As a method for inspecting the thickness of the resin material 2, for example, a method using a camera 10 as shown in Fig. 2 can be considered. However, from the viewpoint of more reliably suppressing short circuits in the electrode laminate in an all-solid-state battery, it is required to more accurately detect the presence or absence of chipping or the like in the resin material 2. In particular, when the thickness of the resin material is thin, for example, when it is about 5 µm or less, the inspection method using a camera may not provide sufficient visibility in the camera image.

[0015] The manufacturing method of the present disclosure includes applying a resin material 2 containing a colorant that reflects a laser to the end face of the electrode laminate precursor 1, excluding the corners, and then inspecting the thickness of the resin material 2 applied to the end face by laser irradiation, for example, using a laser irradiation device 20, based on the corners of the end face as shown in FIG. 3.

[0016] This allows the shape of the entire surface of the resin material 2 to be measured with high precision using a 3D profile. Also, by using both ends of the end face of the electrode laminate precursor 1 as measurement references, it is possible to create a reference for the thickness of the resin material 2 from the portion where the resin material is not applied. Furthermore, the resin material 2 contains a coloring material, which improves reflectivity, allowing for more accurate laser measurement. Furthermore, the resin material 2 contains a coloring agent, which increases the strength of the resin material 2 and improves product reliability. Furthermore, the visibility of the resin material 2 during manufacturing is also improved.

[0017] The electrode laminate produced by the production method of the present disclosure can be used as a component of an all-solid-state battery, for example, a lithium-ion battery.

[0018] The electrode laminate has at least one of a positive electrode layer or a negative electrode layer among a positive electrode current collector layer, a positive electrode layer, a solid electrolyte layer, a negative electrode layer, and a negative electrode current collector layer, and may further have a solid electrolyte layer, a positive electrode current collector layer, and / or a negative electrode current collector layer.

[0019] An all-solid-state battery can have at least one battery unit having a positive electrode current collector layer, a positive electrode layer, a solid electrolyte layer, and a negative electrode layer and a negative electrode current collector layer in this order, by laminating one or more electrode laminates.

[0020] The electrode laminate has a configuration in which a resin material containing a colorant that reflects laser is applied to the end faces of the electrode laminate precursor, excluding the corners.

[0021] The resin material may be, for example, a thermosetting resin or a photosetting resin. The coloring agent that reflects the laser may be, for example, a colored pigment.

[0022] The laser irradiation device may be a general laser irradiation device. [Explanation of symbols]

[0023] 1. Electrode laminate precursor 2. Resin materials 3. Current collecting element 3a Protrusion 10 Camera 20 Laser irradiation device

Claims

[Claim 1] A method for manufacturing an electrode stack for an all-solid-state battery, comprising: providing an electrode stack precursor; applying a resin material containing a colorant that reflects a laser to a portion of the end surface of the electrode laminate precursor excluding the corners; inspecting the thickness of the resin material applied to the end surface by irradiating a laser with a corner of the end surface as a reference; A method for manufacturing an electrode stack, comprising:

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