WO2023058428A1

WO2023058428A1 - Manufacturing method, program, manufacturing system, current collector, and battery

Info

Publication number: WO2023058428A1
Application number: PCT/JP2022/034605
Authority: WO
Inventors: 貴也齊藤; 良基高柳; 絢太郎宮川
Original assignee: ソフトバンク株式会社
Priority date: 2021-10-06
Filing date: 2022-09-15
Publication date: 2023-04-13
Also published as: JP2023055575A; JP2024009909A; JP7366098B2

Abstract

Provided is a manufacturing method comprising: a preparation step of preparing a resin layer; a formation step of forming holes penetrating from an upper face to a lower face of the resin layer, the holes being formed in such a size and numbers that, when a metal is formed on an inner face of the holes, the resistance of the holes per 1 Ah of capacity of a battery employing a current collector is no greater than 1 mΩ; and a current collector manufacturing step of forming a metal on the resin layer to manufacture a current collector in which a metal layer on the upper face and a metal layer on the lower face of the resin layer are electrically connected by the metal on the inner faces of the holes.

Description

Manufacturing method, program, manufacturing system, current collector, and battery

The present invention relates to manufacturing methods, programs, manufacturing systems, current collectors, and batteries.

Metal-plated resin films have been known (see, for example, Patent Document 1).
[Prior art documents]
[Patent Literature]
[Patent Document 1] JP 2018-181823 A

General disclosure

According to one embodiment of the present invention, a manufacturing method is provided. The manufacturing method may comprise a preparation step of preparing a resin layer. The manufacturing method is a forming step of forming a hole penetrating from the upper surface to the lower surface of the resin layer, and when metal is formed on the inner surface of the hole, the resistance of the hole per 1 Ah capacity of the battery in which the current collector is used is , forming holes of a size and number of 1 mΩ or less. The manufacturing method is a current collector manufacturing method in which a metal layer on the upper surface of the resin layer and a metal layer on the lower surface of the resin layer are electrically connected by the metal on the inner surface of the hole by forming a metal on the resin layer. A process may be provided.

　The holes may be circular or elliptical. The pores may be circular and the diameter of the pores may be between 10 and 300 μm. The diameter of the pores may be 50-150 μm. In the forming step, when forming a plurality of holes in the resin layer, the plurality of holes may be formed such that the center-to-center distance between adjacent holes is 20 to 500 μm. In the forming step, when forming a plurality of holes in the resin layer, the plurality of holes may be formed such that the center-to-center distance between adjacent holes is 60 to 350 μm. The thickness of the resin layer may be 1 to 10 μm, the thickness of the upper metal layer may be 0.1 to 2.0 μm, and the thickness of the lower metal layer may be 0.1 to 2.0 μm. It's okay. The thickness of the resin layer may be 3 to 7 μm, the thickness of the upper metal layer may be 0.3 to 1.0 μm, and the thickness of the lower metal layer may be 0.3 to 1.0 μm. It's okay. A ratio of the volume of the metal on the inner surface of the hole to the volume of the hole may be 0.3-20%. A ratio of the volume of the metal on the inner surface of the hole to the volume of the hole may be 1.0 to 10%.

The manufacturing method includes an acquiring step of acquiring battery information including information on the capacity of the battery in which the current collector is used, and a designing step of determining the size and number of the holes based on the battery information. The forming step may form the holes of the size and number determined in the designing step in the resin layer. The current collector manufacturing step may manufacture a plurality of negative electrode current collectors. a stacking step of stacking an agent and a plurality of separators; a tab installation step of sandwiching the projecting portions of the plurality of negative electrode current collectors on which the negative electrode mixture is not stacked between negative electrode tabs and negative electrode Sub tabs and performing resistance welding; A battery comprising a plurality of negative electrode current collectors, a plurality of negative electrode mixtures, a plurality of positive electrode current collectors, a plurality of positive electrode mixtures, a plurality of separators, a negative electrode tab, and a negative electrode Sub tab. and a manufacturing process. The current collector manufacturing step may manufacture the plurality of positive electrode current collectors, and the tab installation step includes forming the protrusions of the plurality of positive electrode current collectors, on which the positive electrode mixture is not laminated, into the positive electrode tabs and the positive electrodes. The battery manufacturing process may include the plurality of negative electrode current collectors, the plurality of negative electrode mixtures, the plurality of positive electrode current collectors, the plurality of positive electrode mixtures, and the plurality of positive electrode mixtures. A battery may be fabricated having a separator, the negative tab, the negative Sub tab, the positive tab, and the positive Sub tab. The current collector manufacturing step may manufacture a plurality of positive electrode current collectors, and the manufacturing method includes a plurality of negative electrode current collectors, a plurality of negative electrode mixtures, a plurality of positive electrode current collectors, a plurality of positive electrode mixtures, and a stacking step of stacking an agent and a plurality of separators; a tab setting step of sandwiching the projecting portions of the plurality of positive electrode current collectors, on which the positive electrode mixture is not stacked, between the positive electrode tab and the positive electrode Sub tab and performing resistance welding; A battery comprising a plurality of negative electrode current collectors, the plurality of negative electrode mixtures, the plurality of positive electrode current collectors, the plurality of positive electrode mixtures, the plurality of separators, the positive electrode tab, and the positive electrode sub tab. and a manufacturing process. The forming step may form the hole in a region sandwiched between the positive electrode tab and the positive electrode Sub tab in the resin layer. In the forming step, when forming the positive electrode current collector, the holes may be formed in regions of the resin layer that are resistance-welded to the positive electrode tab and the positive electrode Sub tab. In the stacking step, the plurality of negative electrode current collectors, the plurality of negative electrode mixtures, the plurality of positive electrode current collectors, the plurality of positive electrode mixtures, and the Multiple separators may be stacked. The forming step may form the hole in a region of the resin layer corresponding to the projecting portion. The forming step may form the hole in a region sandwiched between the negative electrode tab and the negative electrode Sub tab in the resin layer. In the forming step, when forming the negative electrode current collector, the holes may be formed in regions of the resin layer that are resistance-welded to the negative electrode tab and the negative electrode Sub tab. The manufacturing method includes an acquiring step of acquiring battery information including information on the capacity of the battery in which the current collector is used, and a designing step of determining the size and number of the holes based on the battery information. The forming step may form the holes of the size and number determined in the designing step in the resin layer. In the designing step, the holes formed in the projecting portions of the plurality of negative electrode current collectors are stacked so that at least a portion of the holes of the projecting portions of the adjacent negative electrode current collectors overlap. , the position and size of the holes and the spacing between the holes.

According to one embodiment of the present invention, a manufacturing method is provided. The manufacturing method may comprise a preparation step of preparing a plurality of resin layers. The manufacturing method may include a forming step of forming a hole penetrating from the upper surface to the lower surface in each protrusion of the plurality of resin layers. According to the manufacturing method, a metal layer is formed on a resin layer having holes formed in a formation step, whereby the metal layer on the upper surface of the resin layer and the metal layer on the lower surface of the resin layer are electrically connected by the metal on the inner surface of the hole. A current collector generating step for generating a current may be provided. The manufacturing method may include a stacking step of stacking a plurality of negative electrode current collectors, a plurality of negative electrode mixtures, a plurality of positive electrode current collectors, a plurality of positive electrode mixtures, and a plurality of separators. The manufacturing method may include a tab installation step of sandwiching the projecting portions of the plurality of negative electrode current collectors between the negative electrode tab and the negative electrode Sub tab and performing resistance welding. The manufacturing method includes a battery manufacturing process for manufacturing a battery having a plurality of negative electrode current collectors, a plurality of negative electrode mixtures, a plurality of positive electrode current collectors, a plurality of positive electrode mixtures, a plurality of separators, a negative electrode tab, and a negative electrode Sub tab. may be provided. The forming step may form a hole in a region sandwiched between the negative electrode tab and the negative electrode Sub tab in the resin layer. In the current collector forming step, the resin layer having the holes formed in the forming step is plated with a metal so that the metal layer on the upper surface of the resin layer and the metal layer on the lower surface of the resin layer form the inner surfaces of the holes. A positive electrode current collector electrically connected by a metal may be produced, wherein the stacking step comprises: the plurality of negative electrode current collectors and the plurality of positive electrode current collectors produced in the current collector producing step; The plurality of negative electrode mixtures, the plurality of positive electrode mixtures, and the plurality of separators may be laminated, and the tab installation step includes sandwiching the projecting portions of the plurality of positive electrode bodies between positive electrode tabs and positive electrode Sub tabs. In the battery manufacturing process, the plurality of negative electrode current collectors, the plurality of negative electrode mixtures, the plurality of positive electrode current collectors, the plurality of positive electrode mixtures, the plurality of separators, the negative electrode A battery having a tab, the negative electrode Sub tab, the positive electrode tab, and the positive electrode Sub tab may be manufactured, and the forming step includes: The holes may be formed.

According to one embodiment of the present invention, a manufacturing method is provided. The manufacturing method may comprise a preparation step of preparing a plurality of resin layers. The manufacturing method may include a forming step of forming a hole penetrating from the upper surface to the lower surface in each protrusion of the plurality of resin layers. In the manufacturing method, a metal is formed in a resin layer having holes formed in a forming step, whereby a positive electrode collector in which the metal layer on the upper surface and the metal layer on the lower surface of the resin layer are electrically connected by the metal on the inner surface of the hole. A current collector generating step for generating a current may be provided. The manufacturing method may include a stacking step of stacking a plurality of negative electrode current collectors, a plurality of negative electrode mixtures, a plurality of positive electrode current collectors, a plurality of positive electrode mixtures, and a plurality of separators. The manufacturing method may include a tab installation step of sandwiching the protrusions of the plurality of positive electrode current collectors between the positive electrode tab and the positive electrode Sub tab and performing resistance welding. The manufacturing method includes a battery manufacturing process for manufacturing a battery having a plurality of negative electrode current collectors, a plurality of negative electrode mixtures, a plurality of positive electrode current collectors, a plurality of positive electrode mixtures, a plurality of separators, a positive electrode tab, and a positive electrode sub tab. may be provided. The forming step forms a hole in a region of the resin layer sandwiched between the positive electrode tab and the positive electrode Sub tab.

According to one embodiment of the present invention, a program for causing a computer to execute the manufacturing method is provided.

According to one embodiment of the present invention, a manufacturing system is provided. The manufacturing system may comprise a preparation section for preparing the resin layer. The manufacturing system is a hole forming part that forms a hole penetrating from the upper surface to the lower surface of the resin layer, and when metal is formed on the inner surface of the hole, the resistance of the hole per 1 Ah capacity of the battery in which the current collector is used However, it may comprise a pore-forming portion that forms pore sizes and numbers of 1 mΩ or less. The manufacturing system manufactures a current collector in which the metal layer on the upper surface of the resin layer and the metal layer on the lower surface of the resin layer are electrically connected by the metal on the inner surface of the hole by forming the metal on the resin layer. You may have a department.

According to one embodiment of the present invention, a manufacturing system is provided. The manufacturing system may comprise a preparation section for preparing a plurality of resin layers. The manufacturing system may include a hole forming section that forms a hole penetrating from the upper surface to the lower surface in each protrusion of the plurality of resin layers. The manufacturing system forms a metal layer on the resin layer in which the holes are formed in the formation process, thereby forming a negative electrode assembly in which the metal layer on the upper surface of the resin layer and the metal layer on the lower surface of the resin layer are electrically connected by the metal on the inner surface of the hole. A current collector manufacturing unit that manufactures a current may be provided. The manufacturing system may include a lamination part in which a plurality of negative electrode current collectors, a plurality of negative electrode mixtures, a plurality of positive electrode current collectors, a plurality of positive electrode mixtures, and a plurality of separators are laminated. The manufacturing system may include a tab installation section that sandwiches the protrusions of the plurality of negative electrode current collectors between the negative electrode tab and the negative electrode Sub tab and performs resistance welding. The manufacturing system includes a battery manufacturing department that manufactures a battery having a plurality of negative electrode current collectors, a plurality of negative electrode mixtures, a plurality of positive electrode current collectors, a plurality of positive electrode mixtures, a plurality of separators, a negative electrode tab, and a negative electrode Sub tab. may be provided. The hole-forming portion may form a hole in a region sandwiched between the negative electrode tab and the negative electrode Sub tab in the resin layer.

According to one embodiment of the invention, a manufacturing system is provided. The manufacturing system may comprise a preparation section for preparing a plurality of resin layers. The manufacturing system may include a hole forming section that forms a hole penetrating from the upper surface to the lower surface in each protrusion of the plurality of resin layers. The manufacturing system forms a metal layer on the resin layer in which the holes are formed by the hole forming unit, thereby producing a positive electrode in which the metal layer on the upper surface of the resin layer and the metal layer on the lower surface are electrically connected by the metal on the inner surface of the hole. A current collector manufacturing unit for manufacturing the current collector may be provided. The manufacturing system may include a lamination part in which a plurality of negative electrode current collectors, a plurality of negative electrode mixtures, a plurality of positive electrode current collectors, a plurality of positive electrode mixtures, and a plurality of separators are laminated. The manufacturing system may include a tab installation section that sandwiches the projecting portions of the plurality of positive electrode current collectors between the positive electrode tab and the positive electrode Sub tab and performs resistance welding. The manufacturing system includes a battery manufacturing department that manufactures a battery having a plurality of negative electrode current collectors, a plurality of negative electrode mixtures, a plurality of positive electrode current collectors, a plurality of positive electrode mixtures, a plurality of separators, a positive electrode tab, and a positive electrode sub tab. may be provided. The hole-forming portion may form a hole in a region sandwiched between the positive electrode tab and the positive electrode Sub tab in the resin layer.
manufacturing system.

According to one embodiment of the present invention, a current collector is provided. The current collector may comprise a resin layer having at least one hole penetrating from the upper surface to the lower surface. The current collector may comprise metal formed on the upper and lower surfaces of the resin layer and the inner surfaces of the holes. In the current collector, the metal layer on the upper surface of the resin layer and the metal layer on the lower surface are electrically connected by the metal on the inner surface of the hole, and the resistance of the hole per 1 Ah of the battery in which the current collector is used is 1 mΩ. may be:

According to one embodiment of the present invention, a battery having the current collector is provided.

It should be noted that the above outline of the invention does not list all the necessary features of the present invention. Subcombinations of these feature groups can also be inventions.

An example of the battery composition 10 is shown schematically. An example of the battery composition 10 is shown schematically. An example of the laminated body 280 in which the negative electrode tab 204 and the negative electrode Sub tab 206 are welded together is schematically shown. An example of the laminated body 380 with the positive electrode tab 304 and the positive electrode Sub tab 306 welded together is schematically shown. A partial example of a negative electrode current collector 200 is schematically shown. XX cross-sectional view. A partial example of a positive electrode current collector 300 is shown schematically. It is a YY sectional view. An example of the protrusion 210 of the negative electrode current collector 200 is schematically shown. An example of the protrusion 210 of the negative electrode current collector 200 is schematically shown. An example of the protrusion 210 of the negative electrode current collector 200 is schematically shown. An example of the protrusion 210 of the negative electrode current collector 200 is schematically shown. An example of the protrusion 210 of the negative electrode current collector 200 is schematically shown. An example of the protrusion 210 of the negative electrode current collector 200 is schematically shown. An example of the protrusion 210 of the negative electrode current collector 200 is schematically shown. Another example of the battery component 10 is shown schematically. An example of functional composition of manufacturing system 400 is shown roughly. An example of the flow of processing by manufacturing system 400 is shown roughly. An example of a hardware configuration of a computer 1200 functioning as a manufacturing system 400 is shown schematically.

Although the present invention will be described below through embodiments of the invention, the following embodiments do not limit the invention according to the scope of claims. Also, not all combinations of features described in the embodiments are essential for the solution of the invention.

1 and 2 schematically show an example of a battery component 10. FIG. The battery component 10 has a plurality of negative electrodes 20 and positive electrodes 30 alternately laminated with separators 40 interposed therebetween. The negative electrode 20 has a negative electrode current collector 200 and a negative electrode mixture 202 . The positive electrode 30 has a positive electrode current collector 300 and a positive electrode mixture 302 . The negative electrode current collector 200 has protrusions 210 . The positive electrode current collector 300 has protrusions 310 .

1 and 2 exemplify the case where the projecting portion 210 and the projecting portion 310 are arranged in the same direction, but the present invention is not limited to this. The protrusion 210 and the protrusion 310 may be arranged in different directions. For example, protrusion 210 and protrusion 310 may be disposed in opposite directions.

The battery component 10 may be any type of battery component. Battery component 10 is, for example, a component of a lithium ion battery. For example, the negative electrode tab 204 and the negative electrode sub tab 206 are welded to the laminate 280 in which the projecting portion 210 of the negative electrode current collector 200 is stacked, and the positive electrode tab is welded to the laminate 380 in which the projecting portion 310 of the positive electrode current collector 300 is stacked. 304 and positive Sub tab 306 are welded together, and the entire battery construction 10 is placed in a housing or the like and filled with electrolyte to form a lithium ion battery. Note that the battery component 10 may be a component of a lithium-air battery, or may be a component of another type of battery.

FIG. 3 schematically shows an example of a laminate 280 with the negative electrode tab 204 and the negative electrode Sub tab 206 welded together. Tip portions of the plurality of projecting portions 210 are sandwiched between the negative electrode tab 204 and the negative electrode Sub tab 206 and welded. The welding technique may be resistance welding.

FIG. 4 schematically shows an example of a laminate 380 with the positive electrode tab 304 and the positive electrode Sub tab 306 welded together. The tip portions of the plurality of protrusions 310 are sandwiched between the positive electrode tab 304 and the positive electrode Sub tab 306 and welded. The welding technique may be resistance welding.

FIG. 5 schematically shows part of the negative electrode current collector 200. FIG. FIG. 6 is a cross-sectional view taken along line XX. The negative electrode current collector 200 has a resin layer 220 , a metal layer 230 , a metal layer 240 and a metal layer 260 . The negative electrode current collector 200 is manufactured by forming metal on the resin layer 220 in which the holes 250 are formed. The metal layer 230 is located on the top surface 222 of the resin layer 220 , the metal layer 240 is located on the bottom surface 224 of the resin layer 220 , and the metal layer 260 is located on the inner surface 226 of the holes 250 of the resin layer 220 . Metal layer 230 and metal layer 240 are electrically connected by metal layer 260 .

As the resin for the resin layer 220, a resin having lower conductivity and lower density than the metals of the metal layers 230, 240, and 260 is used. Examples of the resin of the resin layer 220 include, but are not limited to, PET (polyethylene terephthalate), PP (polypropylene), PE (polyethylene), PPE (polyphenylene ether), and the like. For example, if battery component 10 is a lithium-ion battery component, the metal of metal layer 230, metal layer 240, and metal layer 260 may be copper, and the resin of resin layer 220 may be PET. The metal of metal layer 230, metal layer 240, and metal layer 260 may be other metals. Also, the resin of the resin layer 220 may be another resin.

Depending on the application of the battery, the current may be low, but the weight may be light. For example, in HAPS (High Altitude Platform Station), which flies in the stratosphere with a solar battery panel and batteries and provides wireless communication services on the ground, the battery output current may be low because there is little change in flight speed. , the weight of the entire HAPS is required to be light. Thus, there are other applications where low current is acceptable but low weight is required.

For example, in the case of lithium-ion batteries, copper foil is often used as the negative electrode current collector, but such requirements can be met by reducing the thickness of the copper foil. However, there is a technical limit to reducing the thickness of the copper foil, and if the thickness of the copper foil is too thin, the strength cannot be maintained and the possibility of breakage increases. Since the negative electrode current collector 200 according to the present embodiment has the resin layer 220 in the middle, compared to a negative electrode current collector made of only metal, the electrical resistance is increased, but the density can be reduced. Also, the strength of the negative electrode current collector 200 can be maintained.

For example, if the metal is copper and the resin is PET, the density of copper is about 8.96 g/cm ³ and the density of PET is about 1.38 g/cm ³ . The weight can be significantly reduced as compared with the case of using only copper.

For example, when the thickness of the negative electrode current collector 200 is 8 μm, and the thickness of the resin layer 220 is 6 μm, the density is about 3.25 g/cm ³ , which is about 35% of the weight ratio of the case where it is composed only of copper. , the weight can be reduced by about 65%. Also, when the thickness of the resin layer 220 is 7 μm, the density is about 2.30 g/cm ³ , and the weight ratio is about 25% compared to the case where the resin layer 220 is composed only of copper, and the weight can be reduced by about 75%.

When the negative electrode current collector is composed only of metal, even if the negative electrode current collector is multi-layered, it is welded by ultrasonic welding, resistance welding, laser welding, etc. because it is metal (conductive materials). Thus, a conductive path can be secured. On the other hand, in conventional metal-plated resin films, the metal is bonded to the resin by adhesive bonding, and the metal cannot be bonded to the edge portion. Therefore, resistance welding cannot be performed as it is. In addition, since the metal layer and the resin layer have different properties in terms of boiling point, thermal expansion, strength, etc., problems such as bursting and residual voids may occur when laser welding is attempted, for example. . Also, if ultrasonic welding is attempted, cracks and breaks may occur.

The negative electrode current collector 200 according to this embodiment has holes 250 , and the metal layers 260 in the holes 250 can ensure a conductive path between the metal layers 230 and 240 . In order to ensure sufficient conductive paths, it is necessary to adjust the size and number of holes 250, the thickness of metal layer 260, and the like. At this time, if the amount of holes 250 is large, the strength of the negative electrode current collector 200 is lowered. The required resistance of the hole 250 will vary depending on the capacity of the battery in which the battery component 10 is used.

Table 1 below shows the size, number, and size of the holes 250 so that the range of resistance is 0.01 mΩ or less, 0.01 to 0.1 mΩ, 0.1 to 1.0 mΩ, and 1.0 mΩ or more. Fig. 3 shows experimental results of variation and strength of batteries when the thickness of the metal layer is selected. In the experiment, the target is the negative electrode current collector 200 used in a battery with a capacity of 1 Ah. In the negative electrode current collector 200, the resin of the resin layer 220 is PET, and the metal of the metal layers 230, 240, and 260 is copper. The hole 250 is formed in a region between the negative electrode tab 204 and the negative electrode Sub tab 206 of the projecting portion 210 and outside the welding region, and the shape of the hole 250 is circular.

100 battery cells with holes 250 formed under the same conditions are prepared, the abnormal cells are removed, the resistance is measured, the average value is calculated, and the percentage of MAX and MIN with respect to the average value is determined. I experimented. In this experiment, within ±3% was desirably "⊚", within ±5% was evaluated as "good", and exceeding 5% was evaluated as "x". For strength, 100 battery cells with holes 250 formed under the same conditions were prepared, and a UN38.3 vibration test was performed. The average value of resistance change is preferably within 3%. "A" was given, and the case of exceeding 5% was given as "X".

If the resistance is 1 mΩ or more, battery variation will increase, so it can be said that the resistance is preferably 1 mΩ or less. If the resistance is 0.01 mΩ or less, it can be said that the strength is not sufficient, so it can be said that the resistance is preferably higher than 0.01 mΩ.

The number and size of the holes 250 are proportional to the number of layers of the negative electrode current collector 200 and the number of holes 250 . Also, the capacity areal density is proportional to the number of holes 250 . Also, the thickness of the metal in the holes 250 , that is, the thickness of the metal layer 260 and the number of holes 250 are inversely proportional. Also, the size and number of holes 250 are inversely proportional.

For example, when the capacity of a battery using the negative electrode current collector 200 is 1 Ah, the positive electrode has one layer (two layers on one side of the negative electrode), the diameter of the hole 250 is 50 μm, and the thickness of the metal layer 260 is 0.5 μm. If so, one or more holes 250 are required.

When the capacity of the battery is 5 Ah, the positive electrode has 20 layers (19 layers on both sides of the negative electrode, 2 layers on one side), the diameter of the hole 250 is 100 μm, and the thickness of the metal layer 260 is 0.5 μm, 50 or more Holes 250 (2.5 holes 250 per sheet) are required.

When the capacity of the battery is 10 Ah, the positive electrode has 20 layers (19 layers on both sides of the negative electrode, 2 layers on one side), the diameter of the hole 250 is 100 μm, and the thickness of the metal layer 260 is 0.5 μm, 100 or more Holes 250 (five holes 250 per sheet) are required.

When the capacity of the battery is 5 Ah, the positive electrode has 40 layers (39 layers on both sides of the negative electrode, 2 layers on one side), the diameter of the hole 250 is 100 μm, and the thickness of the metal layer 260 is 0.5 μm, 100 or more Holes 250 (2.5 holes 250 per sheet) are required.

When the capacity of the battery is 5 Ah, the positive electrode has 20 layers (19 layers on both sides of the negative electrode, 2 layers on one side), the diameter of the hole 250 is 100 μm, and the thickness of the metal layer 260 is 0.1 μm, 250 or more Holes 250 (12.5 holes 250 per sheet) are required.

When the capacity of the battery is 5 Ah, the positive electrode has 20 layers (19 layers on both sides of the negative electrode, 2 layers on one side), the diameter of the hole 250 is 50 μm, and the thickness of the metal layer 260 is 0.5 μm, 100 or more Holes 250 (five holes 250 per sheet) are required.

FIG. 7 schematically shows part of the positive electrode current collector 300. FIG. FIG. 8 is a YY sectional view. The positive electrode current collector 300 has a resin layer 320 , a metal layer 330 , a metal layer 340 and a metal layer 360 . The positive electrode current collector 300 is manufactured by forming metal on the resin layer 320 in which the holes 350 are formed. The metal layer 330 is located on the top surface 322 of the resin layer 320 , the metal layer 340 is located on the bottom surface 324 of the resin layer 320 , and the metal layer 360 is located on the inner surface 326 of the holes 350 of the resin layer 320 . Metal layer 330 and metal layer 340 are electrically connected by metal layer 360 .

As the resin for the resin layer 320, a resin with lower conductivity and lower density than the metals of the metal layers 330, 340, and 360 is used. Examples of the resin of the resin layer 320 include, but are not limited to, PET (polyethylene terephthalate), PP (polypropylene), PE (polyethylene), and PPE (polyphenylene ether). For example, when battery component 10 is a component of a lithium ion battery, the metal of metal layer 330, metal layer 340, and metal layer 360 can be aluminum, and the resin of resin layer 320 can be PET. The metals of metal layer 330, metal layer 340, and metal layer 230 may be other metals. Also, the resin of the resin layer 320 may be another resin.

For example, if the metal of metal layer 330, metal layer 340, and metal layer 360 is aluminum, the resistance of aluminum is twice that of copper. By doubling the number and approximately doubling the size of the holes 250, the same requirements as the negative electrode current collector 200 can be met.

FIG. 9 schematically shows an example of protrusions 210 of the negative electrode current collector 200. FIG. FIG. 9 schematically shows a state in which a plurality of stacked protrusions 210 are viewed from above. A negative electrode tab 204 is positioned on the top projection 210 and resistance welded at weld 208 .

The protruding portion 210 has a perforated portion 212 that includes the hole 250 and a non-perforated portion 214 that does not include the hole 250 . The perforated portion 212 includes a hole 250 in a region corresponding to the welded portion 208, and a region other than the region corresponding to the welded portion 208, in which the negative electrode current collector 200 is used. It may include holes 250 designed to be greater than 01 mΩ and less than or equal to 1 mΩ.

If there is no hole 250 in the area corresponding to the welded portion 208, a power source for heating and eluting the resin layer 220 and a power source for resistance welding are required. This is because it takes time until the next discharge after one discharge, and therefore, one battery cannot keep up with the time. Also, various parameters such as current, pulse pattern, time, and pressure need to be adjusted, and the range of welding conditions is very narrow. In addition, it is necessary to make adjustments each time the metal and resin materials, metals and resin thicknesses are different, and sometimes it takes several days to make adjustments.

On the other hand, by including the hole 250 in the region corresponding to the welded portion 208, it is possible to provide a space for receiving the resin of the resin layer 220 eluted when the negative electrode tab 204 and the negative electrode sub tab 206 are resistance-welded. can. As a result, only one power source is required, the range of welding conditions is wide, and welding can be completed in a few hours even if the conditions are favorable. Furthermore, the region other than the region corresponding to the welded portion 208 includes a hole 250 designed so that the resistance per 1 Ah capacity of the battery in which the negative electrode current collector 200 is used is higher than 0.01 mΩ and not higher than 1 mΩ. Even if there is no electrical conductivity at the welded portion 208, the minimum necessary electrical conductivity can be achieved. Perforated portion 212 may include hole 250 only in the region corresponding to welded portion 208 and the region other than the region corresponding to welded portion 208 , which overlaps with negative electrode tab 204 . Since the region overlapping with the negative electrode tab 204 is sandwiched between the negative electrode tab 204 and the negative electrode sub tab 206, the adhesion between the layers is higher than in other regions, so that the conductive path can be more reliably secured. can contribute to

FIG. 10 schematically shows another example of the projecting portion 210 of the negative electrode current collector 200. FIG. Here, points different from FIG. 9 will be mainly described. A projecting portion 210 illustrated in FIG. 10 has a holeless portion 214 at the tip.

FIG. 11 schematically shows another example of the projecting portion 210 of the negative electrode current collector 200. FIG. Here, points different from FIG. 9 will be mainly described. The projecting portion 210 illustrated in FIG. 11 has a holed portion 212 having a shape along the shape of the negative electrode tab 204 and a holeless portion 214 .

FIG. 12 schematically shows another example of the projecting portion 210 of the negative electrode current collector 200. FIG. Here, points different from FIG. 9 will be mainly described. The protrusion 210 illustrated in FIG. 12 has a perforated portion 212 surrounding the portion of the weld 208 and a non-perforated portion 214 surrounding the perforated portion 212 .

FIG. 13 schematically shows another example of the projecting portion 210 of the negative electrode current collector 200. FIG. Here, points different from FIG. 9 will be mainly described. A projecting portion 210 illustrated in FIG. 13 has a non-perforated portion 214 at the end portion and a perforated portion 212 inside.

FIG. 14 schematically shows another example of the projecting portion 210 of the negative electrode current collector 200. FIG. Here, points different from FIG. 9 will be mainly described. A protruding portion 210 illustrated in FIG. 14 has a non-porous portion 214 and a non-porous portion 216 at the base portion and the tip portion, and has a holed portion 212 at the intermediate portion.

FIG. 15 schematically shows another example of the projecting portion 210 of the negative electrode current collector 200. FIG. Here, points different from FIG. 9 will be mainly described. A projecting portion 210 illustrated in FIG. 15 is a holed portion 212 as a whole. Although the projecting portion 210 of the negative electrode current collector 200 has been described with reference to FIGS. 9 to 15, the projecting portion 310 of the positive electrode current collector 300 may be the same.

FIG. 16 schematically shows another example of the battery component 10. FIG. The battery structure 10 has a laminated battery 50 stacked as shown in FIG. A projecting portion 210 of the negative electrode current collector 200 and a projecting portion 310 of the positive electrode current collector 300 project from the laminate battery 50 . For example, when the battery component 10 is a component of a lithium ion battery, the negative electrode tab 204 and the negative electrode Sub tab 206 are welded to the laminate 280, the positive electrode tab 304 and the positive electrode Sub tab 306 are welded to the laminate 380, A lithium ion battery is formed by putting the entire battery component 10 into a housing or the like.

Although FIG. 16 exemplifies the case where the projecting portion 210 and the projecting portion 310 are arranged in the same direction, the present invention is not limited to this. The protrusion 210 and the protrusion 310 may be arranged in different directions. For example, protrusion 210 and protrusion 310 may be disposed in opposite directions.

17 schematically shows an example of the functional configuration of the manufacturing system 400. FIG. The manufacturing system 400 includes an information acquisition section 402 , a design section 404 , a preparation section 406 , a hole formation section 408 , a current collector production section 410 , a stacking section 412 , a tab installation section 414 , and a battery production section 416 . It should be noted that it is not essential for the manufacturing system 400 to have all of these. For example, if manufacturing system 400 is a system that manufactures current collectors, manufacturing system 400 may not include tab installation section 414 , tab installation section 414 , and battery manufacturing section 416 .

The manufacturing system 400 may be composed of one device. Moreover, the manufacturing system 400 may be configured by a plurality of devices.

The information acquisition unit 402 acquires various types of information. The information acquisition unit 402 acquires information input via an input device of the manufacturing system 400, for example. The information acquisition unit 402 receives information from other devices, for example.

The information acquisition unit 402 acquires, for example, current collector information about the current collector to be manufactured. The current collector information may include information on the resin of the resin layer of the current collector. The current collector may contain information about the metal of the metal layer of the current collector.

The information acquisition unit 402 acquires, for example, battery information related to manufactured batteries. The battery information may include battery capacity information. The battery information may include information on the number of layers included in the battery. The battery information may include the numbers of negative electrodes 20 , positive electrodes 30 , and separators 40 .

The information acquisition unit 402 may acquire negative electrode hole information regarding the holes 250 of the negative electrode current collector 200 . The negative electrode hole information may include information on the positions of the holes 250 formed in the negative electrode current collector 200 . The negative electrode hole information may include information on the size and number of holes 250 formed in the negative electrode current collector 200 . The negative electrode hole information may include information on the thickness of the metal inside the hole 250 formed in the negative electrode current collector 200 . The negative electrode hole information may include information on the spacing of the holes 250 formed in the negative electrode current collector 200 .

The information acquisition unit 402 may acquire positive electrode hole information regarding the holes 350 of the positive electrode current collector 300 . The positive electrode hole information may include information on the positions of the holes 350 formed in the positive electrode current collector 300 . The positive hole information may include information on the size and number of holes 350 formed in the positive current collector 300 . The positive electrode hole information may include information on the thickness of the metal inside the hole 350 formed in the positive electrode current collector 300 . The positive electrode hole information may include information on the spacing of the holes 350 formed in the positive electrode current collector 300 .

The design unit 404 designs the negative electrode current collector 200 based on the information acquired by the information acquisition unit 402 . The design unit 404 designs the negative electrode current collector 200 based on the current collector information and the battery information acquired by the information acquisition unit 402, for example. The design unit 404 determines the size and the number of holes 250 so that the resistance of the holes 250 per 1 Ah of battery capacity is 1 mΩ or less, for example. In addition, the design unit 404 determines the positions and sizes of the holes 250 and the intervals between the holes 250 so that the holes 250 of the vertically overlapping negative electrode current collectors 200 at least partially overlap each other. For example, the design unit 404 makes the spacing between the holes 250 smaller than the diameter of the holes 250 so that the holes 250 of the vertically overlapping negative electrode current collectors 200 at least partially overlap.

The design unit 404 designs the positive electrode current collector 300 based on the information acquired by the information acquisition unit 402 . The design unit 404 designs the positive electrode current collector 300 based on, for example, the current collector information and the battery information acquired by the information acquisition unit 402 . The design unit 404 determines the size and the number of holes 350 so that the resistance of the holes 350 per 1 Ah of battery capacity is 1 mΩ or less, for example. In addition, the design unit 404 determines the positions and sizes of the holes 350 and the intervals between the holes 350 such that the holes 350 of the positive electrode current collectors 300 that overlap vertically overlap at least partially. For example, the design unit 404 makes the spacing between the holes 350 smaller than the diameter of the holes 350 so that the holes 350 of the positive electrode current collectors 300 that overlap one above the other overlap at least partially.

The preparation unit 406 prepares the resin layer 220 . The preparation section 406 may prepare the resin layer 220 with a thickness of 1 to 10 μm. Also, the preparation unit 406 may prepare the resin layer 220 with a thickness of 3 to 7 μm. The preparation unit 406 prepares the resin layer 220 with a thickness of 1 μm, for example. The preparation unit 406 prepares the resin layer 220 with a thickness of 3 μm, for example. The preparation unit 406 prepares the resin layer 220 with a thickness of 2 μm, for example. The preparation unit 406 prepares the resin layer 220 with a thickness of 4 μm, for example. The preparation unit 406 prepares the resin layer 220 with a thickness of 5 μm, for example. The preparation unit 406 prepares the resin layer 220 with a thickness of 6 μm, for example. The preparation unit 406 prepares the resin layer 220 with a thickness of 7 μm, for example. The preparation unit 406 prepares the resin layer 220 with a thickness of 8 μm, for example. The preparation unit 406 prepares the resin layer 220 with a thickness of 9 μm, for example. The preparation unit 406 prepares the resin layer 220 with a thickness of 10 μm, for example.

The preparation unit 406 prepares the resin layer 320 . The preparation section 406 may prepare the resin layer 320 with a thickness of 1 to 10 μm. Also, the preparation unit 406 may prepare the resin layer 320 with a thickness of 3 to 7 μm. The preparation unit 406 prepares a resin layer 320 of 1 μm, for example. The preparation unit 406 prepares the resin layer 320 with a thickness of 2 μm, for example. The preparation unit 406 prepares a resin layer 320 of 3 μm, for example. The preparation unit 406 prepares the resin layer 320 with a thickness of 4 μm, for example. The preparation unit 406 prepares a resin layer 320 of 5 μm, for example. The preparation unit 406 prepares a resin layer 320 of 6 μm, for example. The preparation unit 406 prepares a resin layer 320 of 7 μm, for example. The preparation unit 406 prepares the resin layer 320 with a thickness of 8 μm, for example. The preparation unit 406 prepares the resin layer 320 with a thickness of 9 μm, for example. The preparation unit 406 prepares the resin layer 320 with a thickness of 10 μm, for example.

The hole forming section 408 forms holes 250 in the resin layer 220 prepared by the preparing section 406 so as to penetrate from the upper surface to the lower surface of the resin layer 220 . The hole forming portion 408 may form holes 250 of a size and number such that the resistance of the holes 250 per 1 Ah capacity of the battery in which the negative electrode current collector 200 is used is 1 mΩ or less. The hole forming section 408 forms holes 250 in the resin layer 220 according to, for example, the negative electrode hole information acquired by the information acquiring section 402 . The hole forming section 408 forms holes 250 in the resin layer 220 according to the design by the design section 404, for example.

The shape of the hole 250 formed in the resin layer 220 by the hole forming part 408 may be circular. The diameter of the pores 250 may be, for example, 10-300 μm. The diameter of the pores 250 may be 50-150 μm. The shape of the hole 250 may be oval. The shape of the hole 250 may be polygonal. The shape of the holes 250 may be any other shape. If the shape of the hole 250 is other than circular, the size of the hole 250 may be a size that corresponds to the hole 250 having a circular shape. For example, if the shape of the hole 250 is other than circular, the size of the hole 250 may be a size that has a perimeter similar to the perimeter if the hole 250 were circular. When forming a plurality of holes 250 in the resin layer 220, the hole forming section 408 may form the plurality of holes 250 such that the center-to-center distance between adjacent holes 250 is 20 to 500 μm. The hole forming portion 408 may form a plurality of holes 250 such that the center-to-center distance between adjacent holes 250 is 60-350 μm.

The hole forming part 408 forms holes 250 in the resin layer 220 by chemical etching, for example. The hole forming part 408 may form holes 250 in the resin layer 220 by using an ultrasonic laser. The hole forming part 408 may form the hole 250 in the resin layer 220 by drilling using a drill for drilling. The hole forming section 408 may form holes 250 in the resin layer 220 by gas laser.

The hole forming section 408 forms holes 350 penetrating through the resin layer 320 from the upper surface to the lower surface in the resin layer 320 prepared by the preparation section 406 . The hole forming portion 408 may form holes 350 of a size and number such that the resistance of the holes 350 per 1 Ah of capacity of the battery in which the positive electrode current collector 300 is used is 1 mΩ or less. The hole forming section 408 forms holes 350 in the resin layer 320 according to, for example, the positive electrode hole information acquired by the information acquiring section 402 . The hole forming section 408 forms holes 350 in the resin layer 320 according to the design by the design section 404, for example.

The shape of the hole 350 formed in the resin layer 320 by the hole forming part 408 may be circular. The diameter of the pores 350 may be 50-150 μm. The shape of the hole 350 may be oval. The shape of the hole 350 may be polygonal. The shape of the holes 350 may be any other shape. When the shape of the hole 350 is other than circular, the size of the hole 350 may be a size corresponding to the case where the hole 350 is circular. For example, if the shape of the hole 350 is other than circular, the size of the hole 350 may be a size that has a perimeter similar to the perimeter if the hole 350 were circular. When forming a plurality of holes 350 in the resin layer 320, the hole forming section 408 may form the plurality of holes 350 such that the center-to-center distance between adjacent holes 350 is 20 to 500 μm. The hole forming portion 408 may form a plurality of holes 350 such that the center-to-center distance between adjacent holes 350 is 60-350 μm.

The hole forming section 408 forms holes 350 in the resin layer 320 by chemical etching, for example. The hole forming part 408 may form holes 250 in the resin layer 220 by using an ultrasonic laser. The hole forming part 408 may form the hole 250 in the resin layer 220 by drilling using a drill for drilling. The hole forming section 408 may form holes 250 in the resin layer 220 by gas laser.

The current collector manufacturing unit 410 manufactures current collectors. In the current collector manufacturing unit 410, the hole forming unit 408 forms metal on the resin layer 220 in which the holes 250 are formed, so that the metal layer on the upper surface of the resin layer 220 and the metal layer on the lower surface of the resin layer 220 are formed with holes. A negative electrode current collector 200 electrically connected by metal on the inner surface of 250 is fabricated.

The current collector manufacturing unit 410 manufactures the negative electrode current collector 200, for example, the thickness of the metal on the upper surface is 0.1 to 2.0 μm. The current collector manufacturing unit 410 manufactures the negative electrode current collector 200 having a metal thickness of 0.3 to 1.0 μm on the upper surface, for example. The current collector manufacturing unit 410 manufactures the negative electrode current collector 200, for example, the metal thickness of the bottom surface of which is 0.1 to 2.0 μm. The current collector manufacturing unit 410 manufactures the negative electrode current collector 200, for example, the metal thickness of the bottom surface of which is 0.3 to 1.0 μm.

If the ratio of the volume of the metal on the inner surface of the hole 250 to the volume of the hole 250 is too large, the space into which the resin flows will decrease when resistance welding is performed, resulting in large variations in welding strength. If the ratio of the volume of the metal on the inner surface of the hole 250 to the volume of the hole 250 is too small, the resistance will increase and the weld strength will vary greatly. On the other hand, the inventors repeated experiments and found that by setting the ratio of the volume of the metal on the inner surface of the hole 250 to the volume of the hole 250 to 0.3% or more, the variation in the welding strength fell within a desirable range. It has been found that the variation in welding strength falls within a particularly desirable range when the content is 1% or more. In addition, the inventors have repeatedly conducted experiments, and found that by setting the ratio of the volume of the metal on the inner surface of the hole 250 to the volume of the hole 250 to be less than 20%, the variation in resistance and welding strength falls within the desired range, and 10% It has been found that the variation in resistance and welding strength falls within a particularly desirable range by making it less than. The current collector manufacturing unit 410 manufactures the negative electrode current collector 200 in which the ratio of the volume of the metal on the inner surfaces of the holes 250 to the volume of the holes 250 is 0.3 to 20%, for example. The current collector manufacturing unit 410 manufactures the negative electrode current collector 200 in which the ratio of the volume of the metal on the inner surfaces of the holes 250 to the volume of the holes 250 is 1 to 10%, for example.

In the current collector manufacturing unit 410, the hole forming unit 408 forms metal on the resin layer 320 in which the holes 350 are formed. A cathode current collector 300 electrically connected by metal on the inner surface of 250 is fabricated.

The current collector manufacturing unit 410 manufactures the positive electrode current collector 300, for example, the thickness of the metal on the upper surface is 0.1 to 2.0 μm. The current collector manufacturing unit 410 manufactures the positive electrode current collector 300 in which the thickness of the metal on the upper surface is 0.3 to 1.0 μm, for example. The current collector manufacturing unit 410 manufactures the positive electrode current collector 300, for example, the metal thickness of the bottom surface of which is 0.1 to 2.0 μm. The current collector manufacturing unit 410 manufactures the positive electrode current collector 300, for example, the metal thickness of the bottom surface of which is 0.3 to 1.0 μm. The current collector manufacturing unit 410 manufactures the positive electrode current collector 300 in which the volume ratio of the metal on the inner surfaces of the holes 350 to the volume of the holes 350 is 0.3 to 20%, for example. The current collector manufacturing unit 410 manufactures the positive electrode current collector 300 in which the ratio of the volume of the metal on the inner surfaces of the holes 350 to the volume of the holes 350 is 1 to 10%, for example.

The current collector manufacturing unit 410 may form metal on the resin layer 220 and the resin layer 320 using any known forming method. Examples of forming methods used by the current collector manufacturing unit 410 include, but are not limited to, sputtering, vapor deposition, plating (electroplating, electroless plating), ion plating, molecular bonding, and the like.

The stacking unit 412 is formed by stacking a plurality of negative electrode current collectors 200 and a plurality of positive electrode current collectors 300 manufactured by the current collector manufacturing unit 410, a plurality of negative electrode mixtures, a plurality of positive electrode mixtures, and a plurality of separators. do. As illustrated in FIGS. 1 and 2 , the laminate part 412 is obtained by laminating the negative electrode mixture 202 on a region other than the projecting part 210 of the negative electrode current collector 200 and by stacking the negative electrode mixture 202 on a region other than the projecting part 310 of the positive electrode current collector 300 The positive electrode mixture 302 may be laminated.

The tab setting part 414 sandwiches the protruding parts 210 of the plurality of negative electrode current collectors 200 between the negative electrode tabs 204 and the negative electrode Sub tabs 206 and performs resistance welding. The thickness of the negative electrode tab 204 may be 100-300 μm. The thickness of the negative electrode Sub tab 206 may be 50-100 μm. The tab setting part 414 sandwiches the protruding part 310 of the plurality of positive electrode current collectors 300 between the positive electrode tab 304 and the positive electrode Sub tab 306 and performs resistance welding. The thickness of the positive electrode tab 304 may be 100-300 μm. The thickness of the positive electrode Sub tab 306 may be 50-100 μm. As a device for performing resistance welding, for example, a NAG system precision resistance welder or the like may be employed.

The battery manufacturing department 416 produces a plurality of negative electrode current collectors 200 , a plurality of negative electrode mixtures, a plurality of positive electrode current collectors 300 , a plurality of positive electrode mixtures, a plurality of separators, a negative electrode tab 204 , a negative electrode Sub tab 206 , and a positive electrode tab 304 . , and positive Sub tab 306 . For example, the battery manufacturing unit 416 puts the battery component 10 in which the negative electrode tab 204, the negative electrode sub tab 206, the positive electrode tab 304, and the positive electrode sub tab 306 are installed by the tab installation unit 414 into the housing, and pours electrolyte solution and the like. Batteries are manufactured by performing operations according to the type of battery.

FIG. 18 schematically shows an example of the flow of processing by the manufacturing system 400. FIG. Here, the manufacturing system 400 schematically shows the flow of processing for acquiring battery information and manufacturing a battery according to the battery information.

In step (the step may be abbreviated as S) 102, the information acquisition unit 402 acquires battery information. In S104, the design unit 404 performs design based on the battery information acquired by the information acquisition unit 402 in S102.

In S106, the preparation unit 406 prepares the resin layer 220. In S<b>108 , the hole forming section 408 forms holes 250 in the resin layer 220 according to the design by the design section 404 . In S110, current collector manufacturing section 410 forms metal on resin layer 220 in which holes 250 are formed.

If the production of the current collector has been completed (YES in S112), proceed to S114; if not completed (NO in S112), return to S106. In S<b>106 , the preparation unit 406 prepares the resin layer 220 if the production of the negative electrode current collector 200 has not been completed, and prepares the resin layer 320 if the production has been completed.

In S<b>114 , the stacking unit 412 stacks the manufactured negative electrode current collectors 200 and positive electrode current collectors 300 , the negative electrode mixture, the positive electrode mixture, and the separators 40 . In S116, the tab setting part 414 sandwiches the protrusions 210 of the plurality of negative electrode current collectors 200 between the negative electrode tabs 204 and the negative electrode Sub tabs 206 and performs resistance welding, and the protrusions 310 of the plurality of positive electrode current collectors 300 are connected to the positive electrode tabs. 304 and the positive electrode Sub tab 306, and resistance welded. In S118, the battery manufacturing unit 416 manufactures the battery. Then, the process ends.

In FIG. 18, the flow of processing for manufacturing a battery by the manufacturing system 400 has been described. you can

In the above embodiment, the case where holes are provided in both the negative electrode current collector 200 and the positive electrode current collector 300 has been mainly described, but the present invention is not limited to this. Only the negative electrode current collector 200 out of the negative electrode current collector 200 and the positive electrode current collector 300 may have holes. In this case, the preparation unit 406 may prepare a plurality of positive electrode current collectors as well as prepare the resin layer used for forming the negative electrode current collector 200 . The stacking unit 412 includes a plurality of negative electrode current collectors 200 manufactured by the current collector manufacturing unit 410, a plurality of positive electrode current collectors, a plurality of negative electrode mixtures, a plurality of positive electrode mixtures, and a plurality of positive electrode mixtures prepared by the preparation unit 406. and a plurality of separators may be laminated. The tab setting portion 414 may be formed by sandwiching the projecting portions 210 of the plurality of negative electrode current collectors 200 between the negative electrode tabs 204 and the negative electrode Sub tabs 206 and performing resistance welding. The tab setting part 414 may be welded by sandwiching the projecting parts of the plurality of positive electrode current collectors between the positive electrode tab and the positive electrode Sub tab. The battery manufacturing unit 416 produces a plurality of negative electrode current collectors 200, a plurality of negative electrode mixtures, a plurality of positive electrode current collectors, a plurality of positive electrode mixtures, a plurality of separators, a negative electrode tab 204, a negative electrode Sub tab 206, a positive electrode tab, and A battery may be manufactured with a positive Sub tab.

Only the positive electrode current collector 300 out of the negative electrode current collector 200 and the positive electrode current collector 300 may have holes. In this case, the preparation unit 406 may prepare a plurality of negative electrode current collectors as well as prepare the resin layer used for forming the positive electrode current collector 300 . The stacking unit 412 includes a plurality of positive electrode current collectors 300 manufactured by the current collector manufacturing unit 410, a plurality of negative electrode current collectors, a plurality of negative electrode mixtures, a plurality of positive electrode mixtures, and a plurality of positive electrode mixtures prepared by the preparation unit 406. and a plurality of separators may be laminated. The tab setting portion 414 may be formed by sandwiching the projecting portions 310 of the plurality of positive electrode current collectors 300 between the positive electrode tabs 304 and the positive electrode sub tabs 306 and performing resistance welding. The tab setting portion 414 may be welded by sandwiching the projecting portions of the plurality of negative electrode current collectors between the negative electrode tab and the negative electrode Sub tab. The battery manufacturing unit 416 produces a plurality of negative electrode current collectors, a plurality of negative electrode mixtures, a plurality of positive electrode current collectors 300, a plurality of positive electrode mixtures, a plurality of separators, a negative electrode tab, a negative electrode Sub tab, a positive electrode tab 304, and a positive electrode. A battery with a Sub tab 306 may be manufactured.

FIG. 19 schematically shows an example of the hardware configuration of a computer 1200 that functions as the manufacturing system 400. As shown in FIG. Programs installed on the computer 1200 cause the computer 1200 to function as one or more "parts" of the apparatus of the present embodiments, or cause the computer 1200 to operate or perform operations associated with the apparatus of the present invention. Multiple "units" can be executed and/or the computer 1200 can be caused to execute the process or steps of the process according to the present invention. Such programs may be executed by CPU 1212 to cause computer 1200 to perform certain operations associated with some or all of the blocks in the flowcharts and block diagrams described herein.

A computer 1200 according to this embodiment includes a CPU 1212 , a RAM 1214 and a graphics controller 1216 , which are interconnected by a host controller 1210 . Computer 1200 also includes input/output units such as communication interface 1222 , storage device 1224 , DVD drive, and IC card drive, which are connected to host controller 1210 via input/output controller 1220 . The DVD drive may be a DVD-ROM drive, a DVD-RAM drive, and the like. Storage devices 1224 may be hard disk drives, solid state drives, and the like. Computer 1200 also includes legacy input/output units, such as ROM 1230 and keyboard, which are connected to input/output controller 1220 via input/output chip 1240 .

The CPU 1212 operates according to programs stored in the ROM 1230 and RAM 1214, thereby controlling each unit. Graphics controller 1216 retrieves image data generated by CPU 1212 into a frame buffer or the like provided in RAM 1214 or itself, and causes the image data to be displayed on display device 1218 .

A communication interface 1222 communicates with other electronic devices via a network. Storage device 1224 stores programs and data used by CPU 1212 within computer 1200 . The DVD drive reads programs or data from a DVD-ROM or the like and provides them to the storage device 1224 . The IC card drive reads programs and data from IC cards and/or writes programs and data to IC cards.

ROM 1230 stores therein programs such as boot programs that are executed by computer 1200 upon activation and/or programs that depend on the hardware of computer 1200 . Input/output chip 1240 may also connect various input/output units to input/output controller 1220 via USB ports, parallel ports, serial ports, keyboard ports, mouse ports, and the like.

The program is provided by a computer-readable storage medium such as a DVD-ROM or an IC card. The program is read from a computer-readable storage medium, installed in storage device 1224 , RAM 1214 , or ROM 1230 , which are also examples of computer-readable storage media, and executed by CPU 1212 . The information processing described within these programs is read by computer 1200 to provide coordination between the programs and the various types of hardware resources described above. An apparatus or method may be configured by implementing information operations or processing according to the use of computer 1200 .

For example, when communication is performed between the computer 1200 and an external device, the CPU 1212 executes a communication program loaded into the RAM 1214 and sends communication processing to the communication interface 1222 based on the processing described in the communication program. you can command. The communication interface 1222 reads transmission data stored in a transmission buffer area provided in a recording medium such as a RAM 1214, a storage device 1224, a DVD-ROM, or an IC card under the control of the CPU 1212, and transmits the read transmission data. Data is transmitted to the network, or received data received from the network is written in a receive buffer area or the like provided on the recording medium.

In addition, the CPU 1212 causes the RAM 1214 to read all or necessary portions of files or databases stored in an external recording medium such as a storage device 1224, a DVD drive (DVD-ROM), an IC card, etc. Various types of processing may be performed on the data. CPU 1212 may then write back the processed data to an external recording medium.

Various types of information such as various types of programs, data, tables, and databases may be stored in recording media and subjected to information processing. CPU 1212 performs various types of operations on data read from RAM 1214, information processing, conditional decisions, conditional branching, unconditional branching, and information retrieval, which are described throughout this disclosure and are specified by instruction sequences of programs. Various types of processing may be performed, including /replace, etc., and the results written back to RAM 1214 . In addition, the CPU 1212 may search for information in a file in a recording medium, a database, or the like. For example, when a plurality of entries each having an attribute value of a first attribute associated with an attribute value of a second attribute are stored in the recording medium, the CPU 1212 selects the first attribute from among the plurality of entries. search for an entry that matches the specified condition of the attribute value of the attribute, read the attribute value of the second attribute stored in the entry, and thereby determine the first attribute that satisfies the predetermined condition An attribute value of the associated second attribute may be obtained.

The programs or software modules described above may be stored in a computer-readable storage medium on or near computer 1200 . Also, a recording medium such as a hard disk or RAM provided in a server system connected to a dedicated communication network or the Internet can be used as a computer-readable storage medium, whereby the program can be transferred to the computer 1200 via the network. offer.

The blocks in the flowcharts and block diagrams in this embodiment may represent steps in the process in which the operations are performed or "parts" of the device responsible for performing the operations. Certain steps and "sections" may be provided with dedicated circuitry, programmable circuitry provided with computer readable instructions stored on a computer readable storage medium, and/or computer readable instructions provided with computer readable instructions stored on a computer readable storage medium. It may be implemented by a processor. Dedicated circuitry may include digital and/or analog hardware circuitry, and may include integrated circuits (ICs) and/or discrete circuitry. Programmable circuits, such as Field Programmable Gate Arrays (FPGAs), Programmable Logic Arrays (PLAs), etc., perform AND, OR, EXCLUSIVE OR, NOT AND, NOT OR, and other logical operations. , flip-flops, registers, and memory elements.

A computer-readable storage medium may comprise any tangible device capable of storing instructions to be executed by a suitable device, such that a computer-readable storage medium having instructions stored thereon may be illustrated in flowchart or block diagram form. It will comprise an article of manufacture containing instructions that can be executed to create means for performing specified operations. Examples of computer-readable storage media may include electronic storage media, magnetic storage media, optical storage media, electromagnetic storage media, semiconductor storage media, and the like. More specific examples of computer readable storage media include floppy disks, diskettes, hard disks, random access memory (RAM), read only memory (ROM), erasable programmable read only memory (EPROM or flash memory) , electrically erasable programmable read only memory (EEPROM), static random access memory (SRAM), compact disc read only memory (CD-ROM), digital versatile disc (DVD), Blu-ray disc, memory stick , integrated circuit cards, and the like.

The computer readable instructions may be assembler instructions, Instruction Set Architecture (ISA) instructions, machine instructions, machine dependent instructions, microcode, firmware instructions, state configuration data, or instructions such as Smalltalk, JAVA, C++, etc. any source or object code written in any combination of one or more programming languages, including object-oriented programming languages, and conventional procedural programming languages such as the "C" programming language or similar programming languages; may include

Computer readable instructions are used to produce means for a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, or programmable circuits to perform the operations specified in the flowchart or block diagrams. A general purpose computer, special purpose computer, or other programmable data processor, locally or over a wide area network (WAN) such as the Internet, etc., to execute such computer readable instructions. It may be provided in the processor of the device or in a programmable circuit. Examples of processors include computer processors, processing units, microprocessors, digital signal processors, controllers, microcontrollers, and the like.

Although the present invention has been described above using the embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments. It is obvious to those skilled in the art that various modifications or improvements can be made to the above embodiments. It is clear from the description of the scope of the claims that forms with such modifications or improvements can also be included in the technical scope of the present invention.

The execution order of each process such as actions, procedures, steps, and stages in devices, systems, programs, and methods shown in claims, specifications, and drawings is etc., and it should be noted that they can be implemented in any order unless the output of a previous process is used in a later process. Regarding the operation flow in the claims, specification, and drawings, even if explanations are made using "first," "next," etc. for the sake of convenience, it means that it is essential to carry out in this order. isn't it.

10 Battery component, 20 Negative electrode, 30 Positive electrode, 40 Separator, 50 Laminated battery, 200 Negative electrode current collector, 202 Negative electrode mixture, 204 Negative electrode tab, 206 Negative electrode Sub tab, 208 Welded portion, 210 Protruding portion, 212 Perforated portion , 214 no holes, 216 no holes, 220 resin layer, 222 upper surface, 224 lower surface, 226 inner surface, 230 metal layer, 240 metal layer, 250 holes, 260 metal layer, 280 laminate, 300 positive electrode current collector, 302 Positive electrode mixture, 304 positive electrode tab, 306 positive electrode sub tab, 310 protrusion, 320 resin layer, 322 upper surface, 324 lower surface, 326 inner surface, 330 metal layer, 340 metal layer, 350 hole, 360 metal layer, 380 laminate, 400 Manufacturing system, 402 Information acquisition unit, 404 Design unit, 406 Preparation unit, 408 Hole formation unit, 410 Current collector production unit, 412 Stacking unit, 414 Tab installation unit, 416 Battery production unit, 1200 Computer, 1210 Host controller, 1212 CPU, 1214 RAM, 1216 graphic controller, 1218 display device, 1220 input/output controller, 1222 communication interface, 1224 storage device, 1230 ROM, 1240 input/output chip

Claims

A preparation step of preparing a resin layer;
In the forming step of forming a hole penetrating from the upper surface to the lower surface of the resin layer, in the case where a metal is formed on the inner surface of the hole, the resistance of the hole per 1 Ah capacity of the battery in which the current collector is used is a forming step of forming holes with a size and number of 1 mΩ or less;
By forming a metal on the resin layer, the current collector is manufactured in which the metal layer on the upper surface and the metal layer on the lower surface of the resin layer are electrically connected by the metal on the inner surface of the hole. A manufacturing method comprising: a body manufacturing process;
The manufacturing method according to claim 1, wherein the holes are circular or elliptical.
The manufacturing method according to claim 2, wherein the holes are circular and have a diameter of 10 to 300 µm.
The manufacturing method according to claim 3, wherein the diameter of the pores is 50 to 150 µm.
5. The forming step according to any one of claims 1 to 4, wherein, when forming the plurality of holes in the resin layer, the plurality of holes are formed such that the center-to-center distance between adjacent holes is 20 to 500 μm. 1. The manufacturing method according to item 1.
5. The forming step according to any one of claims 1 to 4, wherein, when forming the plurality of holes in the resin layer, the plurality of holes are formed such that the center-to-center distance between adjacent holes is 60 to 350 μm. 1. The manufacturing method according to item 1.
The thickness of the resin layer is 1 to 10 μm, the thickness of the metal layer on the upper surface is 0.1 to 2.0 μm, and the thickness of the metal layer on the lower surface is 0.1 to 2.0 μm. 7. The manufacturing method according to any one of 1 to 6.
The thickness of the resin layer is 3 to 7 μm, the thickness of the metal layer on the upper surface is 0.3 to 1.0 μm, and the thickness of the metal layer on the lower surface is 0.3 to 1.0 μm. 7. The manufacturing method according to 7.
The manufacturing method according to any one of claims 1 to 8, wherein the ratio of the volume of the metal on the inner surface of the hole to the volume of the hole is 0.3 to 20%.
The manufacturing method according to claim 9, wherein the ratio of the volume of the metal on the inner surface of the hole to the volume of the hole is 1.0 to 10%.
an acquiring step of acquiring battery information including information on the capacity of the battery in which the current collector is used;
a design step of determining the size and number of the holes based on the battery information;
11. The manufacturing method according to any one of claims 1 to 10, wherein said forming step forms said holes of the size and number determined in said designing step in said resin layer.
The current collector manufacturing step includes manufacturing a plurality of negative electrode current collectors,
The manufacturing method is
A stacking step of stacking the plurality of negative electrode current collectors, the plurality of negative electrode mixtures, the plurality of positive electrode current collectors, the plurality of positive electrode mixtures, and the plurality of separators;
a tab installation step of sandwiching the protruding portions of the plurality of negative electrode current collectors, on which the negative electrode mixture is not laminated, between negative electrode tabs and negative electrode Sub tabs and performing resistance welding;
manufacturing a battery having the plurality of negative electrode current collectors, the plurality of negative electrode mixtures, the plurality of positive electrode current collectors, the plurality of positive electrode mixtures, the plurality of separators, the negative electrode tabs, and the negative electrode Sub tabs 11. The manufacturing method according to any one of claims 1 to 10, comprising a battery manufacturing process.
The current collector manufacturing step includes manufacturing the plurality of positive electrode current collectors,
In the tab installation step, the projecting portions of the plurality of positive electrode current collectors on which the positive electrode mixture is not laminated are sandwiched between the positive electrode tab and the positive electrode Sub tab and resistance welded,
The battery manufacturing process comprises: the plurality of negative electrode current collectors, the plurality of negative electrode mixtures, the plurality of positive electrode current collectors, the plurality of positive electrode mixtures, the plurality of separators, the negative electrode tabs, the negative electrode Sub tabs, 13. The manufacturing method according to claim 12, wherein a battery having the positive electrode tab and the positive electrode Sub tab is manufactured.
The current collector manufacturing step includes manufacturing a plurality of positive electrode current collectors,
The manufacturing method is
A stacking step of stacking a plurality of negative electrode current collectors, a plurality of negative electrode mixtures, a positive electrode, a plurality of positive electrode current collectors, a plurality of positive electrode mixtures, and a plurality of separators;
a tab installation step of sandwiching the projecting portions of the plurality of positive electrode current collectors, on which the positive electrode mixture is not laminated, between the positive electrode tab and the positive electrode Sub tab and performing resistance welding;
manufacturing a battery having the plurality of negative electrode current collectors, the plurality of negative electrode mixtures, the plurality of positive electrode current collectors, the plurality of positive electrode mixtures, the plurality of separators, the positive electrode tabs, and the positive electrode sub tabs 11. The manufacturing method according to any one of claims 1 to 10, comprising a battery manufacturing process.
In the stacking step, the plurality of negative electrode current collectors, the plurality of negative electrode mixtures, the plurality of positive electrode current collectors, and the plurality of positive electrode mixtures are laminated so that the layers of the plurality of positive electrode current collectors are at least three layers. , and a plurality of separators.
The manufacturing method according to any one of claims 12 to 15, wherein the forming step forms the hole in a region corresponding to the protrusion of the resin layer.
14. The manufacturing method according to claim 12 or 13, wherein the forming step forms the hole in a region sandwiched between the negative electrode tab and the negative electrode Sub tab in the resin layer.
18. The manufacturing method according to claim 17, wherein the forming step forms the hole in a region of the resin layer that is resistance-welded to the negative electrode tab and the negative electrode Sub tab when the negative electrode current collector is formed. Method.
15. The manufacturing method according to claim 13 or 14, wherein the forming step forms the hole in a region sandwiched between the positive electrode tab and the positive electrode Sub tab in the resin layer.
20. The manufacturing method according to claim 19, wherein the forming step forms the hole in a region of the resin layer that is resistance-welded to the positive electrode tab and the positive electrode Sub tab when the positive electrode current collector is formed. Method.
an acquiring step of acquiring battery information including information on the capacity of the battery in which the current collector is used;
a design step of determining the size and number of the holes based on the battery information;
21. The manufacturing method according to any one of claims 12 to 20, wherein said forming step forms said holes of the size and number determined in said designing step in said resin layer.
In the design step, the holes formed in each of the projecting portions of the plurality of negative electrode current collectors are stacked so that at least a portion of the holes of the projecting portions of the adjacent negative electrode current collectors overlap. 22. The method of manufacturing according to claim 21, wherein the position and size of the holes and the spacing between the holes are determined.
a preparation step of preparing a plurality of resin layers;
a forming step of forming a hole penetrating from the upper surface to the lower surface in each projecting portion of the plurality of resin layers;
By forming a metal on the resin layer in which the holes are formed in the forming step, the metal layer on the upper surface and the metal layer on the lower surface of the resin layer are electrically connected by the metal on the inner surface of the hole. a current collector producing step for producing a negative electrode current collector;
A stacking step of stacking a plurality of negative electrode current collectors, a plurality of negative electrode mixtures, a plurality of positive electrode current collectors, a plurality of positive electrode mixtures, and a plurality of separators;
a tab installation step of sandwiching the projecting portions of the plurality of negative electrode current collectors between a negative electrode tab and a negative electrode Sub tab and performing resistance welding;
manufacturing a battery having the plurality of negative electrode current collectors, the plurality of negative electrode mixtures, the plurality of positive electrode current collectors, the plurality of positive electrode mixtures, the plurality of separators, the negative electrode tabs, and the negative electrode Sub tabs with a battery manufacturing process and
In the forming step, the hole is formed in a region sandwiched between the negative electrode tab and the negative electrode Sub tab in the resin layer.
Production method.
In the current collector forming step, metal is formed on the resin layer in which holes are formed in the forming step, so that the metal layer on the upper surface of the resin layer and the metal layer on the lower surface of the resin layer form inner surfaces of the holes. producing a positive electrode current collector electrically connected by a metal;
In the stacking step, the plurality of negative electrode current collectors and the plurality of positive electrode current collectors generated in the current collector generating step, the plurality of negative electrode mixtures, the plurality of positive electrode mixtures, and the plurality of Laminating the separator and
In the tab installation step, the projecting portions of the plurality of positive electrode current collectors are sandwiched between positive electrode tabs and positive electrode Sub tabs and resistance welded,
The battery manufacturing process comprises: the plurality of negative electrode current collectors, the plurality of negative electrode mixtures, the plurality of positive electrode current collectors, the plurality of positive electrode mixtures, the plurality of separators, the negative electrode tabs, the negative electrode Sub tabs, manufacturing a battery having the positive electrode tab and the positive electrode Sub tab;
24. The manufacturing method according to claim 23, wherein said forming step forms said hole in a region sandwiched between said positive electrode tab and said positive electrode Sub tab in said resin layer.
a preparation step of preparing a plurality of resin layers;
a forming step of forming a hole penetrating from the upper surface to the lower surface in each projecting portion of the plurality of resin layers;
By forming a metal on the resin layer in which the holes are formed in the forming step, the metal layer on the upper surface and the metal layer on the lower surface of the resin layer are electrically connected by the metal on the inner surface of the hole. a current collector producing step for producing a positive electrode current collector;
A stacking step of stacking a plurality of negative electrode current collectors, a plurality of negative electrode mixtures, a plurality of the positive electrode current collectors, a plurality of positive electrode mixtures, and a plurality of separators;
a tab installation step of sandwiching the projecting portions of the plurality of positive electrode current collectors between a positive electrode tab and a positive electrode Sub tab and performing resistance welding;
manufacturing a battery having the plurality of negative electrode current collectors, the plurality of negative electrode mixtures, the plurality of positive electrode current collectors, the plurality of positive electrode mixtures, the plurality of separators, the positive electrode tabs, and the positive electrode sub tabs with a battery manufacturing process and
In the forming step, the hole is formed in a region sandwiched between the positive electrode tab and the positive electrode Sub tab in the resin layer.
Production method.
A program for causing a computer to execute the manufacturing method according to any one of claims 1 to 25.
a preparation section for preparing a resin layer;
A hole forming portion that forms a hole penetrating from the upper surface to the lower surface of the resin layer, wherein the resistance of the hole per 1 Ah of capacity of the battery in which the current collector is used when a metal is formed on the inner surface of the hole is , a hole-forming portion that forms holes with a size and number of 1 mΩ or less;
By forming a metal on the resin layer, the current collector is manufactured in which the metal layer on the upper surface and the metal layer on the lower surface of the resin layer are electrically connected by the metal on the inner surface of the hole. A manufacturing system comprising: a body manufacturing unit;
a preparation unit that prepares a plurality of resin layers;
a hole forming portion that forms a hole penetrating from the upper surface to the lower surface in each projecting portion of the plurality of resin layers;
By forming a metal on the resin layer in which the hole is formed by the hole forming part, the metal layer on the upper surface of the resin layer and the metal layer on the lower surface of the resin layer are electrically connected by the metal on the inner surface of the hole. a current collector manufacturing department that manufactures a negative electrode current collector;
a lamination part for laminating a plurality of the negative electrode current collectors, a plurality of negative electrode mixtures, a plurality of positive electrode current collectors, a plurality of positive electrode mixtures, and a plurality of separators;
a tab setting portion for sandwiching the projecting portions of the plurality of negative electrode current collectors between a negative electrode tab and a negative electrode Sub tab and performing resistance welding;
manufacturing a battery having the plurality of negative electrode current collectors, the plurality of negative electrode mixtures, the plurality of positive electrode current collectors, the plurality of positive electrode mixtures, the plurality of separators, the negative electrode tabs, and the negative electrode Sub tabs Equipped with a battery manufacturing department and
The hole forming portion forms the hole in a region sandwiched between the negative electrode tab and the negative electrode Sub tab in the resin layer.
manufacturing system.
a preparation unit that prepares a plurality of resin layers;
a hole forming portion that forms a hole penetrating from the upper surface to the lower surface in each projecting portion of the plurality of resin layers;
By forming a metal on the resin layer in which the hole is formed by the hole forming part, the metal layer on the upper surface of the resin layer and the metal layer on the lower surface of the resin layer are electrically connected by the metal on the inner surface of the hole. a current collector manufacturing department that manufactures a positive electrode current collector;
a lamination part for laminating a plurality of negative electrode current collectors, a plurality of negative electrode mixtures, a plurality of the positive electrode current collectors, a plurality of positive electrode mixtures, and a plurality of separators;
a tab setting portion for sandwiching the projecting portions of the plurality of positive electrode current collectors between a positive electrode tab and a positive electrode Sub tab and performing resistance welding;
manufacturing a battery having the plurality of negative electrode current collectors, the plurality of negative electrode mixtures, the plurality of positive electrode current collectors, the plurality of positive electrode mixtures, the plurality of separators, the positive electrode tabs, and the positive electrode sub tabs Equipped with a battery manufacturing department and
The hole forming portion forms the hole in a region sandwiched between the positive electrode tab and the positive electrode Sub tab in the resin layer.
manufacturing system.
a current collector,
a resin layer having at least one hole penetrating from the upper surface to the lower surface;
a metal formed on the upper surface and the lower surface of the resin layer and the inner surface of the hole,
The metal layer on the upper surface of the resin layer and the metal layer on the lower surface of the resin layer are electrically connected by the metal on the inner surface of the hole, and the resistance of the hole per 1 Ah of the capacity of the battery in which the current collector is used is is 1 mΩ or less,
current collector.
A battery comprising the current collector according to claim 30.