Method for manufacturing an electrode stack module

Abstract

This invention relates to a method for manufacturing an electrode laminate module. The method of manufacturing the electrode laminate module includes the following steps: (a) providing an electrode laminate extending from the end of a current collector layer; (b) sequentially stacking a first resin sealing member, the electrode laminate, and a second resin sealing member at the end; and (c) heating the current collector layer by irradiating it with a laser, thereby fusing the current collector layer, the first resin sealing member, and the second resin sealing member, respectively, wherein the wavelength of the laser satisfies the following (i) and (ii): (i) the laser absorption rate in the current collector layer is 50% or more, and (ii) the laser absorption rate in the first resin sealing member is 10% or less.

Description

Technical Field

[0001] This invention relates to a method for manufacturing an electrode stack module. Background Technology

[0002] Electrode laminate modules are typically constructed by stacking an electrode laminate, consisting of a positive current collector layer, a positive active material layer, a separator layer or solid electrolyte layer, a negative active material layer, and a negative current collector layer in that order, and then housing it within an outer container. Electrode laminate modules can be manufactured, for example, by alternately stacking current collector foils and resin sealing members and then thermally welding them together to seal the spaces between the electrode laminates.

[0003] For example, International Publication No. 2024 / 106143 discloses a method for manufacturing an energy storage module through the following steps.

[0004] (i) First step: Prepare a laminate having an electrode laminate and a sealing body. The electrode laminate is constructed by stacking two or more electrodes having a current collector having an active material layer and a detection line disposed on the current collector along a first direction. The sealing body is disposed on the electrode laminate in a manner that surrounds the electrode laminate, and is used to seal the internal space between adjacent current collectors in the first direction while leading the detection lines of the two or more electrodes to the outside.

[0005] (ii) Second step: After the first step, a resin component having a hole for the insertion of the detection wire is disposed on the laminate, facing the lead-out portion of the detection wire on the sealing body and creating a gap between them. Simultaneously, the portion of the detection wire leading out from the lead-out portion is inserted into the hole of the resin component.

[0006] (iii) Third step: After the second step, resin is filled into the space between the lead-out portion and the resin component using a mold, thereby forming a filled resin layer integrated with the sealing body, resulting in a battery storage module comprising the laminate, the resin component, and the filled resin layer. In the third step, the sealing body and the resin component are held in place by the mold, thereby forming a space enclosed by the sealing body, the resin component, and the mold, and the filled resin layer is formed by filling this space with resin. It is claimed that the battery storage module manufacturing method described in International Publication No. 2024 / 106143 can suppress damage to the detection lines, and through the compatibility of the sealing body with the resin used for the filled resin layer, the sealing body and the filled resin layer can be firmly integrated.

[0007] Furthermore, International Publication No. 2023 / 189249 discloses an energy storage device comprising: an electrode stack formed by stacking two or more bipolar electrodes, each bipolar electrode comprising a pair of electrodes consisting of a current collector and active material layers disposed on a first and second surface of the current collector; and a sealing body sealing a side surface of the electrode stack extending along the stacking direction of the bipolar electrodes. The sealing body has: two or more frame-shaped sealing members fused to the edges of the current collector; and two or more frame-shaped spacers disposed between adjacent sealing members in the stacking direction. The outer surface of the sealing body is formed by fusing an outer edge portion of each spacer protruding outward from the edge of the current collector with an outer edge portion of each sealing member adjacent to the spacer in the stacking direction that protrudes outward from the edge of the current collector. The melt flow rate of the resin material constituting the spacer is greater than the melt flow rate of the resin material constituting the sealing member. It is claimed that the energy storage device described in International Publication No. 2023 / 189249 can further improve the airtightness of the seal while maintaining a more appropriate spacing between current collectors. Summary of the Invention

[0008] In the manufacturing method of the electrode stack module, when the resin sealing member is fused to the current collector layer, heating is performed from the side of the electrode stack module to thermally fuse the resin sheet and the resin spacer. In this case, to allow for thermal fusion of the resin sheet and the resin spacer, the resin sheet and the resin spacer extend beyond the current collector layer during lamination, resulting in a larger size of the electrode stack module and consequently a decrease in structural efficiency. It should be noted that, in this invention, structural efficiency refers to the ratio of the volume of the electrode stack undergoing the battery reaction to the total volume of the electrode stack module.

[0009] Furthermore, when resin sheets are fused to both sides of the current collector layer and then the resin sheets are fused to the resin spacers, the number of components increases, which in turn increases the number of fusion processes.

[0010] Therefore, the object of the present invention is to provide a method for efficiently manufacturing electrode stack modules with improved structural efficiency.

[0011] The present invention achieves the above objectives through the following means.

[0012] (Method 1)

[0013] A method for manufacturing an electrode laminate module includes the following steps: (a) An electrode stack having a positive active material layer, a current collector layer and a negative active material layer in sequence, wherein the current collector layer extends from its end; (b) At the said end, a first resin sealing member, the electrode laminate, and a second resin sealing member are sequentially stacked; and (c) The end of the current collector layer is heated by irradiating it with a laser through the first resin sealing member from the stacking direction of the electrode stack, thereby fusing one side of the end with the first resin sealing member, the other side of the end with the second resin sealing member, and the first resin sealing member with the second resin sealing member. Furthermore, the wavelength of the laser satisfies the following (i) and (ii): (i) The absorption rate of the laser in the current collector layer is greater than 50%, and (ii) The absorption rate of the laser in the first resin sealing member is less than 10%.

[0014] (Method 2)

[0015] According to the method of method 1, step (c) includes irradiating the laser while pressurizing the current collector layer and the first resin sealing member using a pressure member that is transmissive to the laser.

[0016] (Method 3)

[0017] According to method 1 or 2, the wavelength of the laser is 285nm to 1150nm.

[0018] (Method 4)

[0019] According to any one of methods 1 to 3, the thickness of the first resin sealing member is 800 μm or more.

[0020] (Method 5)

[0021] According to any one of methods 1 to 4, the width of the first resin sealing member is 200 mm or less.

[0022] According to the method of the present invention, electrode stack modules with improved structural efficiency can be manufactured efficiently. Attached Figure Description

[0023] The features, advantages, and technical and industrial significance of exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, in which the same symbols denote the same elements.

[0024] Figure 1A This is a schematic diagram used to illustrate the differences between the prior art and this embodiment.

[0025] Figure 1B This is a schematic diagram used to illustrate the differences between the prior art and this embodiment.

[0026] Figure 1C This is a schematic diagram used to illustrate the differences between the prior art and this embodiment.

[0027] Figure 2 This is a top view used to illustrate the method of the present invention.

[0028] Figure 3 This is a cross-sectional view used to illustrate the method of the present invention.

[0029] Figure 4 This is a cross-sectional view used to illustrate the method of the present invention.

[0030] Figure 5 This is a graph showing the absorption rate corresponding to the laser wavelength in an embodiment of the present invention. Detailed Implementation

[0031] The embodiments of the present invention will now be described in detail. It should be noted that the present invention is not limited to the following embodiments, and various modifications can be made within the scope of the present invention. Furthermore, in the description of the accompanying drawings, the same symbols are used to refer to the same elements, and repeated descriptions are omitted.

[0032] Manufacturing method of electrode laminate module

[0033] The method for manufacturing an electrode laminate module includes the following steps: (a) An electrode stack having a positive active material layer, a current collector layer and a negative active material layer in sequence, wherein the current collector layer extends from its end; (b) At the aforementioned end, a first resin sealing member, the aforementioned electrode laminate, and a second resin sealing member are sequentially stacked; and (c) The ends of the current collector layer are heated by irradiating the first resin sealing member with a laser through the stacking direction of the electrode stack, thereby fusing one side of the end with the first resin sealing member, the other side of the end with the second resin sealing member, and the first resin sealing member with the second resin sealing member. Furthermore, the wavelength of the aforementioned laser satisfies the following (i) and (ii): (i) The absorption rate of the laser in the current collector layer is 50% or more, and (ii) The absorption rate of the laser in the first resin sealing member is less than 10%.

[0034] The above method enables the efficient manufacture of electrode stack modules with improved structural efficiency.

[0035] In previous methods, such as Figure 1AAs shown, for example, two or more frame-shaped resin sheets 401 are pre-fused to each edge of the current collector layer 240, and two or more frame-shaped resin spacers 402 are disposed between adjacent resin sheets 401 in the lamination direction. The resin sheets 401 and the resin spacers 402 are then fused together to manufacture the electrode laminate module. The fusion is performed, for example, by heating from the side. This allows for sufficient fusion, sealing the electrode laminate 200 and suppressing electrolyte leakage.

[0036] However, in the above method, when the resin sheet 401 and the resin spacer 402 are thermally fused, the resin sheet 401 and the resin spacer 402 extend to the outside of the current collector layer for stacking. Therefore, the size of the electrode stack module increases, resulting in a decrease in structural efficiency. In addition, when the resin sheet 401 is fused to both sides of the current collector layer and then the resin sheet 401 and the resin spacer 402 are fused, the number of components increases, resulting in an increase in the number of fusion steps.

[0037] In contrast, the method of the present invention involves stacking a first resin sealing member, an electrode stack, and a second resin sealing member in sequence at the end of the current collector layer. Then, a laser is irradiated through the first resin sealing member from the stacking direction of the electrode stack to heat the end of the current collector layer. This fuses one side of the end with the first resin sealing member, the other side of the end with the second resin sealing member, and the first resin sealing member with the second resin sealing member.

[0038] Therefore, since the laser irradiation is performed through the first resin sealing member along the stacking direction of the electrode stack, no welding allowance is needed for the resin sealing member to fully seal the electrode stack. This allows for a reduction in the size of the resin sealing member, thereby reducing the overall size of the electrode stack module. It should be noted that if the current collector layer and the resin sealing member are not fully welded, then... Figure 1C As shown, electrolyte may leak from between adjacent resin sealing members, and / or between the resin sealing member and the current collector layer, into the exterior of the electrode stack module, and / or into the sealed space of the adjacent electrode stack.

[0039] Furthermore, since laser light can be irradiated from the stacking direction of the electrode stack to fully weld the current collector layer and the resin sealing member, the electrode stack can be fully sealed even if the number of parts and welding processes are reduced.

[0040] Figure 1BOne embodiment of the present invention is shown, but the invention is not limited thereto. At the end of the current collector layer 240, a first resin sealing member 410, an electrode stack 200, and a second resin sealing member 420 are stacked in this order. A laser is irradiated through the first resin sealing member 410 from the stacking direction of the electrode stack 200 to heat the end of the current collector layer 240. This causes one side of the end to be fused to the first resin sealing member 410, the other side of the end to the second resin sealing member 420, and the first resin sealing member 410 and the second resin sealing member 420, respectively.

[0041] Furthermore, in the method of the present invention, laser light is irradiated from the stacking direction through the first resin sealing member toward the end of the current collector layer. Therefore, in the case where two or more electrode stacks are stacked, as... Figure 4 As shown, the end of the current collector layer of the electrode stack closest to the laser in two or more electrode stacks will be heated by laser irradiation. Therefore, by repeating the method of the present invention, i.e., repeatedly stacking the electrode stack and the resin sealing member and irradiating with laser, it is possible to manufacture an electrode stack module with two or more electrode stacks.

[0042] Process (a)

[0043] In the method for manufacturing an electrode stack module according to the present invention, firstly, an electrode stack is provided having a positive active material layer, a current collector layer, and a negative active material layer in sequence, with the current collector layer extending from its end. Specifically, the electrode stack can be provided by coating a positive active material layer on one side of the current collector layer and coating a negative active material layer on the other side.

[0044] Figure 2 The method for manufacturing an electrode laminate module according to the present invention is shown in detail, but the embodiments of the present invention are not limited thereto. In the present invention, an electrode laminate 200 is first provided in which a positive electrode active material layer 220, a current collector layer 240 and a negative electrode active material layer 260 are sequentially stacked. Figure 2 Part (b)). At this point, the end of the current collector layer 240 extends out.

[0045] Electrode stack

[0046] In this invention, the electrode stack comprises a positive electrode active material layer, a current collector layer and a negative electrode active material layer in sequence, and the end of the current collector layer extends outward.

[0047] Positive electrode active material layer

[0048] In this invention, the electrode stack includes a positive electrode active material layer. The positive electrode active material layer of this invention comprises at least positive electrode active material particles, and may optionally comprise a solid electrolyte, a binder, and a conductive additive.

[0049] The content of positive electrode active material in the positive electrode active material layer of the present invention is not particularly limited. It can be 1% or more by mass, 5% or more by mass, 10% or more by mass, or 15% or more by mass, or it can be less than 50% by mass, less than 45% by mass, less than 40% by mass, or less than 35% by mass.

[0050] The material for the positive electrode active material can be any known material used as a positive electrode active material in secondary batteries; there are no special restrictions.

[0051] The positive electrode active material can have any shape, such as spherical or fibrous.

[0052] Particle size D of positive electrode active material 50 There are no particular restrictions; for example, it can be above 1 nm, above 5 nm, or above 10 nm, and it can be below 500 μm, below 100 μm, below 50 μm, or below 30 μm. It should be noted that the particle size D... 50 It is the particle size (median particle size) at the 50% cumulative value of the particle size distribution of the volume reference obtained by laser diffraction / scattering method.

[0053] The solid electrolyte optionally included in the positive electrode active material layer of the present invention can be a material known as a solid electrolyte for secondary batteries. Examples of solid electrolytes include inorganic solid electrolytes such as sulfide solid electrolytes and oxide solid electrolytes, and organic polymer electrolytes such as polymer electrolytes. In particular, from the viewpoint of heat resistance, sulfide solid electrolytes and oxide solid electrolytes are preferred. The solid electrolyte can be, for example, in particulate form. A single solid electrolyte can be used alone, or two or more can be used in combination.

[0054] Examples of sulfide solid electrolytes include, but are not limited to, Li₂S-P₂S₅, LiI-LiBr-Li₂S-P₂S₅, and Li₂S-GeS₂. Sulfide solid electrolytes can be glass (amorphous) or glass-ceramic.

[0055] Examples of oxide solid electrolytes include Li7La3Zr2O. 12 Li 7-3x La3Zr2Al x O 12 And so on, but not limited to these. Oxide solid electrolytes can be amorphous or crystalline.

[0056] Examples of polymer electrolytes include, but are not limited to, polyethylene oxide (PEO), polypropylene oxide (PPO), and their copolymers.

[0057] The content of solid electrolyte optionally included in the positive electrode active material layer of the present invention is not particularly limited. It can be 1% or more by mass, 5% or more by mass, 10% or more by mass, or 13% or more by mass, or it can be less than 60% by mass, less than 50% by mass, less than 40% by mass, or less than 30% by mass.

[0058] In this invention, the conductive additive optionally included in the positive electrode active material layer can be a material known as a conductive additive used in secondary batteries. Specifically, examples of conductive additives include carbon materials such as vapor-grown carbon fiber (VGCF), carbon nanotubes (CNT), carbon nanofibers (CNF), and graphite. Metallic materials capable of withstanding the environment in which the electrode laminate module is used can also be used as conductive additives. A single conductive additive can be used, or two or more can be used in combination. The conductive additive can be in various forms, such as powder or fiber.

[0059] The content of the conductive additive optionally included in the positive electrode active material layer of the present invention is not particularly limited. It can be 0.1% by mass or more, 0.5% by mass or more, 1% by mass or more, or 3% by mass or more, or 20% by mass or less, 15% by mass or less, 10% by mass or less, or 8% by mass or less.

[0060] As an optional binder included in the positive electrode active material layer of the present invention, a substance known as a binder used in secondary batteries can be used. Examples of binders include styrene-butadiene rubber (SBR), carboxymethyl cellulose (CMC), butadiene rubber (BR), polyvinylidene fluoride (PVDF), and polytetrafluoroethylene (PTFE). A single binder may be used, or two or more may be used in combination.

[0061] The content of the binder optionally included in the positive electrode active material layer of the present invention is not particularly limited. It can be 0.1% by mass or more, 0.5% by mass or more, 1% by mass or more, or 3% by mass or more, or 20% by mass or less, 15% by mass or less, 10% by mass or less, or 8% by mass or less.

[0062] Current collector layer

[0063] In this invention, the electrode stack includes a current collector layer, and the end of the current collector layer extends outward.

[0064] At the end of the current collector layer of the present invention, the positive active material layer and / or the negative active material layer may not be coated, or the positive active material layer and / or the negative active material layer may be coated on a portion of the end of the current collector layer.

[0065] In this invention, the materials used as the current collector layer include, but are not limited to, copper, aluminum, aluminum alloys, stainless steel, nickel, etc.

[0066] In this invention, the thickness of the current collector layer is not particularly limited. It can be 10 μm or more, 20 μm or more, 30 μm or more, or 40 μm or more, and it can be less than 100 μm, 80 μm or less, 70 μm or less, 60 μm or less, or 50 μm or less.

[0067] Negative electrode active material layer

[0068] In this invention, the electrode stack includes a negative electrode active material layer. The negative electrode active material layer of this invention comprises at least negative electrode active material particles, and may optionally include a solid electrolyte, a binder, and a conductive additive.

[0069] As the negative electrode active material, any material known as a negative electrode active material for secondary batteries can be used, without any particular restrictions.

[0070] In this invention, when viewed from the stacking direction of the electrode stack, the size of the negative electrode active material layer can be larger than the size of the positive electrode active material layer.

[0071] For details regarding the negative electrode active material layer, the negative electrode active material, and the solid electrolyte, binder, and conductive additive optionally included in the negative electrode active material layer of the present invention, please refer to the description of the positive electrode active material layer in the present invention.

[0072] Process (b)

[0073] In the method for manufacturing an electrode laminate module according to the present invention, the first resin sealing member, the electrode laminate, and the second resin sealing member are then sequentially laminated at the aforementioned end.

[0074] In this invention, at the end of the current collector layer 240, the electrode laminate 200 and the first resin sealing member 410 can be sequentially stacked on top of the second resin sealing member 420. Figure 2 Part (c) and Figure 3 Part (a)).

[0075] First and second resin sealing components

[0076] In this invention, the first and second resin sealing members are stacked at the ends of the current collector layer in the order of the first resin sealing member, the electrode stack, and the second resin sealing member. One side of the end is fused to the first resin sealing member, the other side of the end is fused to the second resin sealing member, and the first resin sealing member is fused to the second resin sealing member.

[0077] In this invention, the material of the resin sealing member can be freely selected within a range that allows for sufficient welding of the current collector layer to the first and / or second resin sealing member, and welding of the first resin sealing member to the second resin sealing member. There are no particular limitations; examples include, but are not limited to, polypropylene (PP), polyolefins, polyester copolymers, polyethylene terephthalate, nylon, etc.

[0078] In this invention, the thickness of the first and second resin sealing members is not particularly limited. It can be 100 μm or more, 300 μm or more, 500 μm or more, or 800 μm or more, and it can be 5000 μm or less, 4000 μm or less, 3000 μm or less, 2000 μm or less, or 1000 μm or less.

[0079] In this invention, the width of the first and second resin sealing members is not particularly limited. It can be 1 mm or more, 3 mm or more, 5 mm or more, or 7 mm or more, and can be less than 200 mm, less than 100 mm, less than 50 mm, less than 30 mm, or less than 10 mm.

[0080] Process (c)

[0081] In the method for manufacturing the electrode stack module of the present invention, a laser is irradiated through the first resin sealing member from the stacking direction of the electrode stack to heat the end of the current collector layer. This heats one side of the end to the first resin sealing member, the other side of the end to the second resin sealing member, and the first resin sealing member and the second resin sealing member, respectively.

[0082] In this invention, laser 500 is irradiated through the first resin sealing member 410 from the stacking direction of the electrode stack 200 to heat the end of the current collector layer 240. Figure 2 Part (d) and Figure 3 Part (b)). Thus, one end face of the current collector layer 240 can be fused to the first resin sealing member 410, the other end face of the current collector layer 240 to the second resin sealing member 420, and the first resin sealing member 410 and the second resin sealing member 420 respectively. In this invention, as... Figure 2 As shown in part (d), a laser can be continuously irradiated at the end of the current collector layer 240 from one position at the end of the current collector layer 240, thereby fusing the periphery of the electrode stack and sealing the electrode stack.

[0083] In this invention, such as Figure 2As shown in part (d), step (c) may include irradiating the laser 500 while pressurizing the current collector layer 240 and the first resin sealing member 410 using a pressure member 600 that is transmissible to the laser 500. This can at least improve the welding between the current collector layer 240 and the first resin sealing member 410, and between the current collector layer 240 and the second resin sealing member 420.

[0084] Additionally, in this invention, step (c) may include: welding the diaphragm 300 to the first resin sealing member 410. Figure 2 Part (e) Figure 3 Part (c) and Figure 3 Part (d)). At this time, as a method for welding the diaphragm to the first resin sealing member, examples such as heat welding can be cited, but are not limited to.

[0085] It should be noted that, as Figure 2 Part (f) to Figure 2 As shown in part (j), an electrode stack module with two or more electrode stacks can be manufactured by repeating the method of the present invention.

[0086] laser

[0087] In this invention, a laser is irradiated through the first resin sealing member from the stacking direction of the electrode stack to heat the end of the current collector layer. In this invention, the wavelength of the laser satisfies the following (i) and (ii): (i) The absorption rate of the laser in the current collector layer is 50% or more, and (ii) The absorption rate of the laser in the first resin sealing member is less than 10%.

[0088] In this invention, the absorption rate of laser in the current collector layer is not particularly limited and can be above 50%, above 60%, or above 70%, and can be below 90%, below 85%, or below 80%.

[0089] In this invention, the absorption rate of laser in the resin sealing component is not particularly limited, and can be 0.5% or more, 1.0% or more, or 3% or more, and can be less than 10%, 8% or less, or 5% or less.

[0090] It should be noted that, in this invention, the transmittance of the laser in the current collector layer and the resin sealing component can be determined by spectrophotometry. For example, a spectrophotometer (PerkinElmer, LAMBDA950) with a 150 mm diameter integrating sphere as a detector can be used to measure the transmittance at wavelengths of 250–2000 nm. Alternatively, an FT-IR spectrometer (PerkinElmer, System2000) with a 150 mm diameter integrating sphere (PerkinElmer, RSA-PE-200-ID) internally coated with gold can be used as a detector to measure the transmittance at wavelengths of 2000–25000 nm.

[0091] In this invention, the wavelength of the laser is not particularly limited. It can be 285nm or higher, 345nm or higher, 400nm or higher, or 450nm or higher, and can be 1150nm or lower, 1000nm or lower, 950nm or lower, or 850nm or lower.

[0092] Pressure components

[0093] In this invention, a pressure-applying member applies pressure to the current collector layer and the first resin sealing member. There are no particular limitations as long as the material of the pressure-applying member is transmissive to laser light.

[0094] The invention will be described in more detail below with reference to the embodiments shown, but the scope of the invention is not limited to these embodiments.

[0095] Example

[0096] Example 1

[0097] Stacking of current collector layer and resin sealing component

[0098] In Examples 1 and 2, it was confirmed that the current collector layer and the resin sealing member can be fused together using the method of the present invention.

[0099] A Modic H511 (Mitsubishi Chemical Corporation) with a thickness of 800 μm was prepared as the resin sealing component, and a copper foil with a carbon-coated surface (weld width 10 mm, weld length 90 mm) was prepared as the current collector layer. The current collector layer was configured such that a portion of it was sandwiched between the two resin sealing components, and pressure was applied to the overlapping area of ​​the current collector layer and the resin sealing components using a pressure-applying component.

[0100] Laser irradiation and resin welding

[0101] A laser is irradiated onto the laminated portion of the current collector layer and the resin sealing member from the lamination direction using a pressure member, thereby heating the current collector layer and fusing it with the two resin sealing members to obtain the laminate of Example 1. It should be noted that the relationship between the irradiated laser wavelength and the absorptivity of the current collector layer and the resin sealing member in this example is shown below. Figure 5 The laser wavelength at this time is 1060nm, the laser absorption rate in the current collector layer is above 50%, and the laser absorption rate in the resin sealing component is below 10%. Other conditions for laser irradiation are as follows.

[0102] Laser beam diameter: 12mm × 28mm

[0103] Laser power: 1000W

[0104] Scanning speed: 400 mm / s

[0105] Example 2

[0106] Except for using a copper foil without carbon coating as the current collector layer and setting the laser wavelength to 450 nm, the same procedure as in Example 1 was followed to obtain the laminate of Example 2. In this case, the laser wavelength was 1060 nm, the laser absorption rate in the current collector layer was more than 50%, and the laser absorption rate in the resin sealing member was less than 10%.

[0107] evaluate

[0108] For the laminates of Examples 1 and 2, the current collector layer and the resin sealing member are fully fused at the laminated portion of the current collector layer and the resin sealing member.

[0109] Example 3

[0110] In Example 3, it was confirmed that by repeating the method of the present invention, a laminate in which two or more current collector layers and two or more resin sealing members are alternately stacked and fused together can be produced.

[0111] Creation of stacked bodies

[0112] On top of the resin sealing member fused in Example 1, a current collector layer and a resin sealing member are further stacked sequentially. The stacked portion is irradiated with a laser to fuse the current collector layer and the resin sealing member. This operation is repeated 3 times to create a laminate with 5 current collector layers, in which the current collector layer and the resin sealing member are alternately stacked.

[0113] evaluate

[0114] It has been confirmed that by repeatedly using the method of the present invention, a laminate in which two or more current collector layers and two or more resin sealing members are alternately stacked can be manufactured.

Claims

1. A method for manufacturing an electrode laminate module, comprising the following steps: (a) An electrode stack having a positive active material layer, a current collector layer and a negative active material layer in sequence, wherein the current collector layer extends from its end; (b) At the said end, a first resin sealing member, the electrode laminate, and a second resin sealing member are sequentially stacked; and (c) The end of the current collector layer is heated by irradiating it with a laser through the first resin sealing member from the stacking direction of the electrode stack, thereby fusing one side of the end with the first resin sealing member, the other side of the end with the second resin sealing member, and the first resin sealing member with the second resin sealing member. Furthermore, the wavelength of the laser satisfies the following (i) and (ii): (i) The absorption rate of the laser in the current collector layer is greater than 50%, and (ii) The absorption rate of the laser in the first resin sealing member is less than 10%.

2. The method according to claim 1, wherein, Step (c) includes irradiating the laser while pressurizing the current collector layer and the first resin sealing member using a pressurizing member.

3. The method according to claim 1, wherein, The wavelength of the laser is 285nm to 1150nm.

4. The method according to claim 1, wherein, The thickness of the first resin sealing component is 800 μm or more.

5. The method according to claim 1, wherein, The width of the first resin sealing component is less than 200 mm.

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