JP2024009909A - Manufacturing method, program, manufacturing system, current collector, and battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a battery, a program, a manufacturing system, a current collector, and a battery.

SOLUTION: A manufacturing method includes a preparation step of preparing a resin layer, a formation step of forming a hole penetrating from the top surface to the bottom surface of a resin layer, and forming a hole of a size and number such that when metal is formed on the inner surface of the hole, in which the resistance of the hole is 1 mΩ or less per 1 Ah of the capacity of a battery in which a current collector is used, and a current collector manufacturing step of manufacturing the current collector in which a metal layer on the top surface of the resin layer and a metal layer on the bottom surface are electrically connected by the metal on the inner surface of the hole by forming metal on the resin layer.

SELECTED DRAWING: Figure 17

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present invention relates to a manufacturing method, a program, a manufacturing system, a current collector, and a battery.

Metal-plated resin films have been known (for example, see Patent Document 1).
[Prior art documents]
[Patent document]
[Patent Document 1] Japanese Patent Application Publication No. 2018-181823

According to one embodiment of the present invention, a manufacturing method is provided. The manufacturing method may include 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 of capacity of the battery in which the current collector is used is , a formation step of forming holes of a size and number of 1 mΩ or less. The manufacturing method involves forming a metal on the resin layer to produce a current collector in which the metal layer on the top surface of the resin layer and the metal layer on the bottom surface are electrically connected by the metal on the inner surface of the hole. A process may be provided.

The holes may be circular or oval. The pores may be circular and the diameter of the pores may be from 10 to 300 μm. The diameter of the pores may be between 50 and 150 μm. In the forming step, when a plurality of holes are formed in the resin layer, the plurality of holes may be formed such that the distance between the centers of adjacent holes is 20 to 500 μm. In the forming step, when a plurality of holes are formed in the resin layer, the plurality of holes may be formed such that the distance between the centers of adjacent holes is 60 to 350 μm. The thickness of the resin layer may be 1 to 10 μm, the thickness of the metal layer on the top surface may be 0.1 to 2.0 μm, and the thickness of the metal layer on the bottom surface may be 0.1 to 2.0 μm. It's good to be there. The thickness of the resin layer may be 3 to 7 μm, the thickness of the metal layer on the top surface may be 0.3 to 1.0 μm, and the thickness of the metal layer on the bottom surface may be 0.3 to 1.0 μm. It's good to be there. The ratio of the volume of the metal on the inner surface of the hole to the volume of the hole may be 0.3 to 20%. The 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 acquisition step of acquiring battery information including information on the capacity of the battery in which the current collector is used, and a design step of determining the size and number of the holes based on the battery information. In the forming step, the holes having the size and number determined in the designing step may be formed in the resin layer. The current collector manufacturing process may manufacture a plurality of negative electrode current collectors, and the manufacturing method includes the plurality of negative electrode current collectors, a plurality of negative electrode mixtures, a plurality of positive electrode current collectors, and a plurality of positive electrode mixtures. a lamination step of laminating a plurality of separators and a plurality of separators; a tab installation step of sandwiching and resistance welding the protruding portions of the plurality of negative electrode current collectors on which the negative electrode mixture is not laminated between a negative electrode tab and a negative electrode sub tab; A battery for manufacturing a battery having a plurality of negative electrode current collectors, a plurality of negative electrode mixtures, a plurality of positive electrode 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. In the current collector manufacturing step, the plurality of positive electrode current collectors may be manufactured, and in the tab installation step, the protruding portions of the plurality of positive electrode current collectors on which the positive electrode mixture is not laminated are connected to the positive electrode tab and the positive electrode. The battery manufacturing process includes 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 manufactured that includes a separator, the negative electrode tab, the negative sub tab, the positive tab, and the positive sub tab. The above current collector manufacturing process may manufacture a plurality of positive electrode current collectors, and the above manufacturing method includes 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 positive electrode current collectors. a lamination step of laminating a plurality of separators and a plurality of separators; a tab installation step of sandwiching and resistance welding the protruding 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; A battery for manufacturing a battery having a plurality of negative electrode current collectors, a plurality of negative electrode mixtures, a plurality of positive electrode collectors, a plurality of positive electrode mixtures, a plurality of separators, a positive electrode tab, and a positive sub tab. and a manufacturing process. In the forming step, the hole may be formed in a region of the resin layer sandwiched between the positive electrode tab and the positive electrode sub tab. In the forming step, when producing the positive electrode current collector, the hole may be formed in a region of the resin layer that is resistance welded to the positive electrode tab and the positive electrode sub tab. In the laminating 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 A plurality of separators may be stacked. In the forming step, the hole may be formed in a region of the resin layer that corresponds to the protrusion. In the forming step, the hole may be formed in a region of the resin layer sandwiched between the negative electrode tab and the negative electrode sub tab. In the forming step, when producing the negative electrode current collector, the hole may be formed in a region of the resin layer that is resistance welded to the negative electrode tab and the negative electrode sub tab. The manufacturing method includes an acquisition step of acquiring battery information including information on the capacity of the battery in which the current collector is used, and a design step of determining the size and number of the holes based on the battery information. In the forming step, the holes having the size and number determined in the designing step may be formed in the resin layer. The design process is performed so that the holes formed in each of the protrusions of the plurality of negative electrode current collectors overlap at least in part with the holes of the protrusions of adjacent negative electrode current collectors due to stacking. , the location and size of the holes and the spacing between the holes may be determined.

According to one embodiment of the present invention, a manufacturing method is provided. The manufacturing method may include 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. The manufacturing method is to form a negative electrode assembly in which a metal layer on the upper surface of the resin layer and a metal layer on the lower surface are electrically connected by the metal on the inner surface of the holes by forming metal on a resin layer in which holes are formed in a forming process. The method may include a current collector generation step of generating an electric body. 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 in which the protruding portions of the plurality of negative electrode current collectors are sandwiched between the negative electrode tab and the negative electrode sub tab and resistance welded. 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. In the forming step, holes may be formed in a region of the resin layer sandwiched between the negative electrode tab and the negative electrode sub tab. In the current collector generation step, the metal layer on the upper surface and the metal layer on the lower surface of the resin layer are formed on the inner surface of the hole by plating metal on the resin layer in which holes are formed in the forming step. A positive electrode current collector electrically connected by metal may be generated, and the laminating step includes the plurality of negative electrode current collectors and the plurality of positive electrode current collectors generated in the current collector generation step, The plurality of negative electrode mixtures, the plurality of positive electrode mixtures, and the plurality of separators may be stacked, and the tab installation step includes sandwiching the protruding portions of the plurality of positive electrode bodies between the positive electrode tab and the positive electrode sub tab. The battery manufacturing process includes 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, and the negative electrode. A battery may be manufactured that has a tab, the negative electrode sub tab, the positive electrode tab, and the positive electrode sub tab, and the forming step includes forming a battery in a region of the resin layer sandwiched between the positive electrode tab and the positive electrode sub tab. The holes may be formed.

According to one embodiment of the present invention, a manufacturing method is provided. The manufacturing method may include 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. The manufacturing method is to form a positive electrode assembly 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 holes by forming metal on the resin layer in which holes are formed in the forming process. The method may include a current collector generation step of generating an electric body. 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 protruding portions of the plurality of positive electrode current collectors between a positive electrode tab and a positive electrode sub tab and resistance welding them. 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. In the forming step, a hole is formed 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 above manufacturing method is provided.

According to one embodiment of the invention, a manufacturing system is provided. The manufacturing system may include a preparation unit that prepares 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 a metal is formed on the inner surface of the hole, the resistance of the hole per 1 Ah of battery capacity in which the current collector is used is determined. However, it may be provided with a hole forming section that forms holes with a size and number of 1 mΩ or less. The manufacturing system is a current collector manufacturing method in which a metal layer is formed on the resin layer to produce a current collector 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. may have a section.

According to one embodiment of the invention, a manufacturing system is provided. The manufacturing system may include a preparation unit that prepares 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 the protrusion of each of the plurality of resin layers. The manufacturing system forms 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 are electrically connected by the metal on the inner surface of the holes by forming metal on the resin layer in which holes are formed in the forming process. It may include a current collector manufacturing section that manufactures the current body. The manufacturing system may include a lamination unit that laminates 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 system may include a tab installation section that sandwiches and resistance welds the protrusions of the plurality of negative electrode current collectors between the negative electrode tab and the negative electrode sub tab. The manufacturing system includes a battery manufacturing department that manufactures batteries having multiple negative electrode current collectors, multiple negative electrode mixtures, multiple positive electrode current collectors, multiple positive electrode mixtures, multiple separators, negative electrode tabs, and negative electrode sub tabs. may be provided. The hole forming section may form a hole in a region of the resin layer sandwiched between the negative electrode tab and the negative electrode sub tab.

According to one embodiment of the invention, a manufacturing system is provided. The manufacturing system may include a preparation unit that prepares 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 the protrusion of each of the plurality of resin layers. The manufacturing system forms 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 by forming metal on the resin layer in which holes are formed by the hole forming section. It may include a current collector manufacturing section that manufactures the current collector. The manufacturing system may include a lamination unit that laminates 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 system may include a tab installation section that sandwiches and resistance welds the protrusions of the plurality of positive electrode current collectors between the positive electrode tab and the positive electrode sub tab. The manufacturing system includes a battery manufacturing department that manufactures batteries having multiple negative electrode current collectors, multiple negative electrode mixtures, multiple positive electrode current collectors, multiple positive electrode mixtures, multiple separators, positive electrode tabs, and positive electrode sub tabs. may be provided. The hole forming section may form a hole in a region of the resin layer sandwiched between the positive electrode tab and the positive electrode sub tab.
manufacturing system.

According to one embodiment of the invention, a current collector is provided. The current collector may include a resin layer having at least one hole penetrating from the top surface to the bottom surface. The current collector may include metal formed on the upper and lower surfaces of the resin layer and the inner surface of the hole. 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 is 1 mΩ per 1 Ah of capacity of the battery in which the current collector is used. It may be the following.

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

Note that the above summary of the invention does not list all the necessary features of the invention. Furthermore, subcombinations of these features may also constitute inventions.

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

Hereinafter, the present invention will be described through embodiments of the invention, but the following embodiments do not limit the invention according to the claims. Furthermore, not all combinations of features described in the embodiments are essential to the solution of the invention.

1 and 2 schematically show an example of a battery configuration 10. FIG. The battery structure 10 has a plurality of negative electrodes 20 and positive electrodes 30 stacked alternately with separators 40 in between. The negative electrode 20 includes a negative electrode current collector 200 and a negative electrode mixture 202. The positive electrode 30 includes a positive electrode current collector 300 and a positive electrode mixture 302. Negative electrode current collector 200 has a protrusion 210 . The positive electrode current collector 300 has a protrusion 310 .

Although FIGS. 1 and 2 illustrate the case where the protrusion 210 and the protrusion 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 arranged in opposite directions.

Battery component 10 may be any type of battery component. The 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 a laminate 280 in which the protruding portion 210 of the negative electrode current collector 200 is laminated, and the positive electrode tab is welded to the laminate 380 in which the protruding portion 310 of the positive electrode current collector 300 is laminated. 304 and the positive electrode sub tab 306 are welded together, and the entire battery component 10 is placed in a housing or the like and filled with an electrolyte, thereby forming a lithium ion battery. Note that the battery component 10 may be a component of a lithium-air battery or a component of another type of battery.

FIG. 3 schematically shows an example of a laminate 280 in which the negative electrode tab 204 and the negative electrode sub tab 206 are welded together. The tip portions of the plurality of protrusions 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 in which the positive electrode tab 304 and the positive electrode sub tab 306 are 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 a part of the negative electrode current collector 200. FIG. 6 is a cross-sectional view taken along line XX. Negative electrode current collector 200 includes 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. Metal layer 230 is located on the top surface 222 of resin layer 220 , metal layer 240 is located on the bottom surface 224 of resin layer 220 , and metal layer 260 is located on the inner surface 226 of hole 250 in 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 but lower density than the metals for 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), and PPE (polyphenylene ether). For example, when the battery component 10 is a component of a lithium ion battery, the metal of the metal layer 230, the metal layer 240, and the metal layer 260 may be copper, and the resin of the resin layer 220 may be PET. The metal of metal layer 230, metal layer 240, and metal layer 260 may be other metals. Further, the resin of the resin layer 220 may be other resins.

Depending on the purpose of the battery, the current may be low, but the weight may be desired to be light. For example, in HAPS (High Altitude Platform Station), which flies through the stratosphere with solar panels and batteries and provides wireless communication services on the ground, the output current of the battery may be low because there are few changes in flight speed. , the weight of the entire HAPS is required to be light. In this way, there are other applications where low current is acceptable but light weight is required.

For example, in the case of lithium ion batteries, copper foil is often used as the negative electrode current collector, and such demands can be met by reducing the thickness of the copper foil. However, there are technical limits to reducing the thickness of copper foil, and if the thickness of copper foil is made too thin, it will not be able to maintain its strength and the possibility of breakage will increase. Since the negative electrode current collector 200 according to this embodiment has the resin layer 220 in the middle, the electrical resistance is increased compared to a negative electrode current collector made only of metal, but the density can be lowered. Moreover, the strength of the negative electrode current collector 200 can also 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 , so the negative electrode current collector is The weight can be significantly reduced compared to a structure made of only copper.

For example, if 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 will be about 3.25 g/cm ³ , and the weight ratio will be about 35% compared to when it is made of copper only. , the weight can be reduced by about 65%. Furthermore, if the thickness of the resin layer 220 is 7 μm, the density will be approximately 2.30 g/cm ³ , and the weight ratio will be approximately 25% compared to the case where the resin layer is made of only copper, making it possible to reduce the weight by approximately 75%.

If the negative electrode current collector is made only of metal, even if the negative electrode current collector is multilayered, the metals (conductive materials) are welded together using ultrasonic welding, resistance welding, laser welding, etc. This ensures a conductive path. On the other hand, in conventional metal-plated resin films, metal is bonded to resin by adhesive bonding, and metal cannot be bonded to the edges, so when multilayered, a conductive path cannot be ensured. For this reason, resistance welding cannot be performed as is. In addition, since the metal layer and the resin layer have different characteristics in terms of boiling point, thermal expansion, strength, etc., for example, if laser welding is attempted, problems such as rupture and residual voids may occur. . Furthermore, if ultrasonic welding is attempted, cracks or breaks may occur.

The negative electrode current collector 200 according to this embodiment has a hole 250, and the metal layer 260 in the hole 250 can ensure a conductive path between the metal layer 230 and the metal layer 240. In order to ensure a sufficient conductive path, it is necessary to adjust the size and number of holes 250, the thickness of metal layer 260, etc. At this time, if the number of holes 250 is large, the strength of the negative electrode current collector 200 will be reduced, so it is better not to have too many holes 250, and it may be better to keep it to the necessary minimum. The required resistance of the holes 250 will vary depending on the capacity of the battery in which the battery composition 10 is used.

Table 1 below shows the size and number of holes 250, the number of holes in the holes, etc., so that the resistance range is 0.01 mΩ or less, 0.01 to 0.1 mΩ, 0.1 to 1.0 mΩ, and 1.0 mΩ or more. The experimental results of the variation and strength of the battery when the thickness of the metal layer is selected are shown. In this experiment, a negative electrode current collector 200 used in a battery having a capacity of 1 Ah was targeted. In the negative electrode current collector 200, the resin of the resin layer 220 is PET, and the metal of the metal layer 230, the metal layer 240, and the metal layer 260 is copper. The hole 250 is formed in a region sandwiched between the negative electrode tab 204 and the negative electrode sub tab 206 of the protruding portion 210 and outside the region to be welded, and the shape of the hole 250 is circular.

To measure battery variations, create 100 battery cells with holes 250 formed under the same conditions, remove abnormal cells, measure the resistance, calculate the average value, and calculate the percentage of MAX and MIN with respect to the average value. I experimented to see what would happen. In this experiment, a value within ±3% was desirably marked as "◎", a value within ±5% was marked as a pass "○", and a value exceeding 5% was marked as "x". For strength, 100 battery cells with holes 250 formed under the same conditions were made and a UN38.3 vibration test was conducted.The average value of resistance change was desirably within 3% and was ``◎'', and within 5% passed. It was marked as "◎", and cases where it exceeded 5% were marked as "x".

When the resistance is 1 mΩ or more, the variation in the battery becomes large, so it can be said that the resistance is desirably 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 desirably higher than 0.01 mΩ.

Regarding the number and size of the holes 250, the number of layers of the negative electrode current collector 200 and the number of holes 250 are proportional. Further, the capacitive surface density and the number of holes 250 are proportional. Further, 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. Furthermore, the size and number of holes 250 are inversely proportional.

For example, in the case where the capacity of the battery in which the negative electrode current collector 200 is used 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. In this case, one or more holes 250 are required.

When the capacity of the battery is 5Ah, the positive electrode has 20 layers (the negative electrode has 19 layers on both sides, and the single side has 2 layers), 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.

If the capacity of the battery is 10 Ah, the positive electrode has 20 layers (the negative electrode has 19 layers on both sides, and the single side has 2 layers), the diameter of the hole 250 is 100 μm, and the thickness of the metal layer 260 is 0.5 μm, then 100 or more Holes 250 (5 holes 250 per sheet) are required.

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

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

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

FIG. 7 schematically shows a part of the positive electrode current collector 300. FIG. 8 is a YY cross-sectional view. The positive electrode current collector 300 includes 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. Metal layer 330 is located on the top surface 322 of resin layer 320 , metal layer 340 is located on the bottom surface 324 of resin layer 320 , and metal layer 360 is located on the inner surface 326 of hole 350 in 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 having lower conductivity and lower density than the metals for 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 the battery component 10 is a component of a lithium ion battery, the metal of the metal layer 330, the metal layer 340, and the metal layer 360 may be aluminum, and the resin of the resin layer 320 may be PET. The metal of metal layer 330, metal layer 340, and metal layer 230 may be other metals. Further, the resin of the resin layer 320 may be other resins.

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

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

The protruding portion 210 has a holed portion 212 that includes a hole 250 and a holeless 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 has a resistance per 1 Ah of the battery capacity in which the negative electrode current collector 200 is used in a region other than the welded portion 208 of 0.0. The hole 250 may be designed to be greater than 0.1 mΩ and less than or equal to 1 mΩ.

If the hole 250 does not exist in the area corresponding to the welding part 208, a power source for heating and eluting the resin layer 220 and a power source for resistance welding are required. This is because once a discharge is performed, it takes time for the next discharge to occur, so one method is not sufficient in time. Furthermore, various parameters such as current, pulse pattern, time, and pressure must be adjusted, and the range of conditions that can be welded is very narrow. In addition, adjustments are required each time the metal or resin material, metal or resin thickness changes, and in some cases it can take several days to make adjustments.

On the other hand, by including the hole 250 in the region corresponding to the welding part 208, a space can be provided to receive the resin of the resin layer 220 that is 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 conditions under which welding can be performed is wide, and even if the conditions are favorable, welding can be completed in about a few hours. Furthermore, by including a hole 250 in a region other than the region corresponding to the welded portion 208, the hole 250 is designed so that the resistance per 1 Ah of battery capacity in which the negative electrode current collector 200 is used is higher than 0.01 mΩ and lower than 1 mΩ. Even if the welded portion 208 becomes non-conductive, the minimum necessary conductivity can be achieved. Note that the holed portion 212 may include the holes 250 only in a region corresponding to the welded portion 208 and a region other than the region corresponding to the welded portion 208 that overlaps with the 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 a conductive path can be more reliably secured. can contribute to

FIG. 10 schematically shows another example of the protrusion 210 of the negative electrode current collector 200. Here, the differences from FIG. 9 will be mainly explained. The protruding portion 210 illustrated in FIG. 10 has a holeless portion 214 at the tip.

FIG. 11 schematically shows another example of the protrusion 210 of the negative electrode current collector 200. Here, the differences from FIG. 9 will be mainly explained. The protruding portion 210 illustrated in FIG. 11 includes a holed portion 212 shaped to follow the shape of the negative electrode tab 204 and a holeless portion 214.

FIG. 12 schematically shows another example of the protrusion 210 of the negative electrode current collector 200. Here, the differences from FIG. 9 will be mainly explained. The protruding portion 210 illustrated in FIG. 12 has a holed portion 212 surrounding the welded portion 208 and a non-perforated portion 214 surrounding the holed portion 212.

FIG. 13 schematically shows another example of the protrusion 210 of the negative electrode current collector 200. Here, the differences from FIG. 9 will be mainly explained. The protruding part 210 illustrated in FIG. 13 has a non-perforated part 214 at the end and a perforated part 212 inside.

FIG. 14 schematically shows another example of the protrusion 210 of the negative electrode current collector 200. Here, the differences from FIG. 9 will be mainly explained. The protruding portion 210 illustrated in FIG. 14 has a holeless portion 214 and a holeless portion 216 at the root portion and the tip portion, and has a holed portion 212 at the middle portion.

FIG. 15 schematically shows another example of the protrusion 210 of the negative electrode current collector 200. Here, the differences from FIG. 9 will be mainly explained. The entire protruding portion 210 illustrated in FIG. 15 is a holed portion 212 . Although the protrusion 210 of the negative electrode current collector 200 has been described using FIGS. 9 to 15, the protrusion 310 of the positive electrode current collector 300 may be similar.

FIG. 16 schematically shows another example of the battery structure 10. As shown in FIG. 16, the battery structure 10 includes stacked laminate batteries 50. A protruding portion 210 of the negative electrode current collector 200 and a protruding portion 310 of the positive electrode current collector 300 protrude from the laminate battery 50 . For example, when the battery component 10 is a lithium ion battery component, 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 placing the entire battery component 10 in a housing or the like.

Although FIG. 16 shows an example in which the protrusion 210 and the protrusion 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 arranged in opposite directions.

FIG. 17 schematically shows an example of the functional configuration of the manufacturing system 400. The manufacturing system 400 includes an information acquisition section 402, a design section 404, a preparation section 406, a hole forming section 408, a current collector manufacturing section 410, a laminating section 412, a tab installation section 414, and a battery manufacturing section 416. Note that it is not essential for the manufacturing system 400 to include all of these. For example, when the manufacturing system 400 is a system for manufacturing a current collector, the manufacturing system 400 does not need to include the tab installation section 414, the tab installation section 414, and the battery manufacturing section 416.

Manufacturing system 400 may be configured by one device. Further, the manufacturing system 400 may be configured by a plurality of devices.

The information acquisition unit 402 acquires various 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, for example, another device.

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

The information acquisition unit 402 acquires, for example, battery information regarding a battery to be manufactured. The battery information may include information on battery capacity. The battery information may include information on the number of layers included in the battery. The battery information may include the number 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 position of the hole 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 metal within the hole 250 formed in the negative electrode current collector 200. The negative electrode hole information may include information on the spacing between 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 position of the hole 350 formed in the positive electrode current collector 300. The positive electrode hole information may include information on the size and number of holes 350 formed in the positive electrode current collector 300. The positive electrode hole information may include information on the thickness of metal within the hole 350 formed in the positive electrode current collector 300. The positive electrode hole information may include information on the spacing between 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. For example, the design unit 404 designs the negative electrode current collector 200 based on the current collector information and battery information acquired by the information acquisition unit 402. For example, the design unit 404 determines the size and number of holes 250 such that the resistance per 1 Ah of battery capacity is 1 mΩ or less. Further, the design department 404 determines the positions and sizes of the holes 250 and the intervals between the holes 250 so that, for example, the holes 250 of the negative electrode current collectors 200 that overlap one another overlap at least partially. For example, the design department 404 makes the interval between the holes 250 smaller than the diameter of the holes 250 so that the holes 250 of the negative electrode current collectors 200 that overlap one another overlap at least in part.

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, for example, based on the current collector information and battery information acquired by the information acquisition unit 402. For example, the design unit 404 determines the size and number of holes 350 such that the resistance per 1 Ah of battery capacity is 1 mΩ or less. Further, the design department 404 determines the positions and sizes of the holes 350 and the intervals between the holes 350 so that, for example, the holes 350 of the positive electrode current collectors 300 that overlap one another overlap at least partially. For example, the design department 404 makes the interval 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 another overlap at least in part.

The preparation unit 406 prepares the resin layer 220. The preparation unit 406 may prepare the resin layer 220 with a thickness of 1 to 10 μm. Further, 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, for example, 1 μm. 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, for example, 5 μm. 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, for example, 8 μm. 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, for example, 10 μm.

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

The hole forming unit 408 forms holes 250 in the resin layer 220 prepared by the preparation unit 406, penetrating 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 of capacity of the battery in which the negative electrode current collector 200 is used is 1 mΩ or less. The hole forming unit 408 forms the holes 250 in the resin layer 220, for example, according to the negative electrode hole information acquired by the information acquisition unit 402. The hole forming unit 408 forms the holes 250 in the resin layer 220, for example, according to the design by the design unit 404.

The shape of the hole 250 formed in the resin layer 220 by the hole forming section 408 may be circular. The diameter of the hole 250 may be, for example, 10 to 300 μm. The diameter of the holes 250 may be between 50 and 150 μm. The shape of the hole 250 may be elliptical. The shape of the hole 250 may be polygonal. The shape of the hole 250 may be any other shape. When the hole 250 has a shape other than circular, the size of the hole 250 may be a size corresponding to the case where the hole 250 is circular. For example, when the hole 250 has a shape other than a circular shape, the size of the hole 250 may have a circumferential length similar to the circumferential length when the hole 250 is 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 distance between the centers of adjacent holes 250 is 20 to 500 μm. The hole forming section 408 may form a plurality of holes 250 such that the distance between the centers of adjacent holes 250 is 60 to 350 μm.

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

The hole forming unit 408 forms in the resin layer 320 prepared by the preparation unit 406 a hole 350 that penetrates from the upper surface to the lower surface of the resin layer 320. 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 unit 408 forms the holes 350 in the resin layer 320, for example, according to the positive electrode hole information acquired by the information acquisition unit 402. The hole forming unit 408 forms holes 350 in the resin layer 320, for example, according to the design by the design unit 404.

The shape of the hole 350 formed in the resin layer 320 by the hole forming section 408 may be circular. The diameter of the holes 350 may be between 50 and 150 μm. The shape of the hole 350 may be elliptical. The shape of the hole 350 may be polygonal. The shape of the hole 350 may be any other shape. When the hole 350 has a shape 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, when the hole 350 has a shape other than circular, the size of the hole 350 may have a circumferential length similar to the circumferential length when the hole 350 is 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 distance between the centers of adjacent holes 350 is 20 to 500 μm. The hole forming section 408 may form a plurality of holes 350 such that the distance between the centers of adjacent holes 350 is 60 to 350 μm.

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

The current collector manufacturing unit 410 manufactures current collectors. The current collector manufacturing unit 410 forms metal on the resin layer 220 in which the holes 250 are formed by the hole forming unit 408, 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 form holes. A negative electrode current collector 200 electrically connected by the metal on the inner surface of the electrode 250 is manufactured.

The current collector manufacturing unit 410 manufactures the negative electrode current collector 200 in which the thickness of the metal on the upper surface is 0.1 to 2.0 μm, for example. The current collector manufacturing unit 410 manufactures the negative electrode current collector 200 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, for example, the negative electrode current collector 200 in which the thickness of the metal on the lower surface is 0.1 to 2.0 μm. The current collector manufacturing unit 410 manufactures, for example, the negative electrode current collector 200 in which the thickness of the metal on the lower surface 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, there will be less space for the resin to flow during resistance welding, resulting in greater variation 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 become high and the variation in welding strength will become large. On the other hand, by repeating experiments, the inventor 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 welding strength fell within a desirable range. It has been found that by setting it to 1% or more, the variation in welding strength can be kept within a particularly desirable range. In addition, by repeating experiments, the inventor has 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 can be kept within a desirable range. It has been found that variations in resistance and welding strength can be kept within particularly desirable ranges by setting the resistance and welding strength to less than 100%. 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 surface of the hole 250 to the volume of the hole 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 surface of the hole 250 to the volume of the hole 250 is 1 to 10%, for example.

The current collector manufacturing unit 410 forms metal on the resin layer 320 in which the holes 350 are formed by the hole forming unit 408, so that the metal layer on the upper surface of the resin layer 320 and the metal layer on the lower surface of the resin layer 320 have holes. A positive electrode current collector 300 electrically connected by the metal on the inner surface of the electrode 250 is manufactured.

The current collector manufacturing unit 410 manufactures, for example, a positive electrode current collector 300 whose upper surface metal has a thickness of 0.1 to 2.0 μm. The current collector manufacturing unit 410 manufactures, for example, a positive electrode current collector 300 whose upper surface metal has a thickness of 0.3 to 1.0 μm. The current collector manufacturing unit 410 manufactures, for example, a positive electrode current collector 300 in which the thickness of the metal on the lower surface is 0.1 to 2.0 μm. The current collector manufacturing unit 410 manufactures, for example, a positive electrode current collector 300 in which the thickness of the metal on the lower surface is 0.3 to 1.0 μm. 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 surface of the hole 350 to the volume of the hole 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 surface of the hole 350 to the volume of the hole 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, and molecular bonding.

The lamination unit 412 laminates 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 laminated portion 412 has the negative electrode mixture 202 laminated on an area other than the protruding part 210 of the negative electrode current collector 200, and the negative electrode mixture 202 is laminated on an area other than the protruding part 310 of the positive electrode current collector 300. The positive electrode mixture 302 may be stacked.

The tab installation 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. The thickness of the negative electrode tab 204 may be 100 to 300 μm. The thickness of the negative electrode sub tab 206 may be 50 to 100 μm. In the tab installation section 414, the protrusions 310 of the plurality of positive electrode current collectors 300 are sandwiched between the positive electrode tab 304 and the positive electrode sub tab 306 and subjected to resistance welding. The thickness of the positive electrode tab 304 may be 100 to 300 μm. The thickness of the positive electrode sub tab 306 may be 50 to 100 μm. As a device for performing resistance welding, for example, a precision resistance welding machine manufactured by NAG System may be employed.

The battery manufacturing department 416 includes 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 a positive electrode Sub tab 306 is manufactured. For example, the battery manufacturing department 416 places 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 in a housing by the tab installation part 414, and performs injection of electrolyte, etc. 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. Here, a process flow in which the manufacturing system 400 acquires battery information and manufactures batteries according to the battery information is schematically shown.

In step (step may be abbreviated as S) 102, the information acquisition unit 402 acquires battery information. In S104, the design unit 404 executes 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 S108, the hole forming unit 408 forms holes 250 in the resin layer 220 according to the design by the design unit 404. In S110, the current collector manufacturing unit 410 forms metal on the resin layer 220 in which the holes 250 are formed.

If the production of the current collector is completed (YES in S112), the process proceeds to S114, and if it is not completed (NO in S112), the process returns to S106. In S106, 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 S114, the stacking unit 412 laminates the manufactured negative electrode current collectors 200 and the positive electrode current collectors 300, the negative electrode mixtures, the positive electrode mixtures, and the separators 40. In S116, the tab installation unit 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 connects the protrusions 310 of the plurality of positive electrode current collectors 300 to the positive electrode tabs. 304 and the positive electrode sub tab 306 and resistance welded. In S118, the battery manufacturing unit 416 manufactures a battery. Then, the process ends.

In FIG. 18, the process flow in which the manufacturing system 400 manufactures a battery has been described. However, when the manufacturing system 400 manufactures a current collector, the process ends when the manufacturing of the current collector is completed in S112. It's fine.

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 of the negative electrode current collector 200 and the positive electrode current collector 300 may form holes. In this case, the preparation unit 406 may prepare a resin layer used to generate the negative electrode current collector 200 and also prepare a plurality of positive electrode current collectors. The laminated part 412 includes a plurality of negative electrode current collectors 200 manufactured by the current collector manufacturing part 410, a plurality of positive electrode current collectors prepared by the preparation part 406, a plurality of negative electrode mixtures, a plurality of positive electrode mixtures, and a plurality of separators may be stacked. The tab installation portion 414 may be formed by sandwiching the protruding 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 installation portion 414 may be formed by sandwiching and welding the protruding portions of the plurality of positive electrode current collectors between the positive electrode tab and the positive electrode sub tab. The battery manufacturing department 416 includes 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 of the negative electrode current collector 200 and the positive electrode current collector 300 may form holes. In this case, the preparation unit 406 may prepare a resin layer used to generate the positive electrode current collector 300 and also prepare a plurality of negative electrode current collectors. The laminated section 412 includes a plurality of positive electrode current collectors 300 manufactured by the current collector manufacturing section 410, a plurality of negative electrode current collectors prepared by the preparation section 406, a plurality of negative electrode mixtures, a plurality of positive electrode mixtures, and a plurality of separators may be stacked. The tab installation portion 414 may be formed by sandwiching the protruding 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 installation part 414 may be formed by sandwiching and welding the protruding parts of the plurality of negative electrode current collectors between the negative electrode tab and the negative electrode sub tab. The battery manufacturing department 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 may be manufactured with a sub-tab 306.

FIG. 19 schematically shows an example of the hardware configuration of a computer 1200 functioning as the manufacturing system 400. The program installed on the computer 1200 causes the computer 1200 to function as one or more "parts" of the apparatus according to the present embodiment, or causes the computer 1200 to perform operations associated with the apparatus according to the present embodiment or the one or more "parts" of the apparatus according to the present embodiment. Multiple units may be executed and/or the computer 1200 may execute a process or a stage of a process according to the present embodiments. 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.

The 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 a communication interface 1222, a storage device 1224, a DVD drive, and an 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, etc. Storage device 1224 may be a hard disk drive, solid state drive, or the like. Computer 1200 also includes legacy input/output units, such as ROM 1230 and a keyboard, which are connected to input/output controller 1220 via input/output chips 1240.

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

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 a program or data from a DVD-ROM or the like and provides it to the storage device 1224. The IC card drive reads programs and data from and/or writes programs and data to the IC card.

ROM 1230 stores therein programs that are dependent on the computer 1200 hardware, such as a boot program that is executed by the computer 1200 upon activation. I/O chip 1240 may also connect various I/O units to I/O controller 1220 via USB ports, parallel ports, serial ports, keyboard ports, mouse ports, etc.

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 in these programs is read by the computer 1200 and provides coordination between the programs and the various types of hardware resources described above. An apparatus or method may be configured to implement the operation or processing of information 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 written in the communication program. You may give orders. 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 to a reception buffer area provided on the recording medium.

Further, the CPU 1212 causes the RAM 1214 to read all or a necessary part of a file or database 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 the processed data back to an external storage medium.

Various types of information, such as various types of programs, data, tables, and databases, may be stored on a recording medium and subjected to information processing. CPU 1212 performs various types of operations, information processing, conditional determination, conditional branching, unconditional branching, and information retrieval on data read from RAM 1214 as described elsewhere in this disclosure and specified by the program's instruction sequence. Various types of processing may be performed, including /substitutions, etc., and the results are written back to RAM 1214. Further, 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 are stored in a recording medium, each having an attribute value of a first attribute associated with an attribute value of a second attribute, the CPU 1212 selects the first entry from among the plurality of entries. Search for an entry whose attribute value matches the specified condition, read the attribute value of the second attribute stored in the entry, and then set the attribute value to 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 storage 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, thereby allowing the program to be transferred to the computer 1200 via the network. provide.

Blocks in the flowcharts and block diagrams of the present embodiments may represent stages in a process in which an operation is performed or a "part" of a device responsible for performing the operation. Certain steps and units may be provided with dedicated circuitry, programmable circuitry provided with computer readable instructions stored on a computer readable storage medium, and/or provided with computer readable instructions stored on a computer readable storage medium. May be implemented by a processor. Dedicated circuitry may include digital and/or analog hardware circuits, and may include integrated circuits (ICs) and/or discrete circuits. Programmable circuits can perform AND, OR, EXCLUSIVE OR, NAND, NOR, and other logical operations, such as field programmable gate arrays (FPGAs), programmable logic arrays (PLAs), etc. , flip-flops, registers, and memory elements.

A computer-readable storage medium may include any tangible device capable of storing instructions for execution by a suitable device such that a computer-readable storage medium with instructions stored therein may be illustrated in a flowchart or block diagram. A product will be provided that includes instructions that can be executed to create a 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 Disk Read Only Memory (CD-ROM), Digital Versatile Disc (DVD), Blu-ray Disc, Memory Stick , integrated circuit cards, and the like.

Computer-readable instructions may include 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 code or object code written in any combination of one or more programming languages, including object-oriented programming languages such as may include.

The computer-readable instructions are for producing means for a processor of a general purpose computer, special purpose computer, or other programmable data processing device, or programmable circuit 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 local area network (LAN), wide area network (WAN), such as the Internet, to execute the computer readable instructions. It may be provided in a processor or programmable circuit of the device. 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 range described in the above embodiments. It will be apparent to those skilled in the art that various changes or improvements can be made to the embodiments described above. It is clear from the claims that such modifications or improvements may be included within the technical scope of the present invention.

The execution order of each process, such as an operation, a procedure, a step, and a stage in the apparatus, system, program, and method shown in the claims, specification, and drawings, specifically refers to "before" or "before". It should be noted that they can be implemented in any order unless the output of the previous process is used in the subsequent process. Even if the claims, specifications, and operational flows in the drawings are explained using "first," "next," etc. for convenience, this does not mean that it is essential to carry out the operations in this order. It's not a thing.

10 battery components, 20 negative electrode, 30 positive electrode, 40 separator, 50 laminate battery, 200 negative electrode current collector, 202 negative electrode mixture, 204 negative electrode tab, 206 negative electrode sub tab, 208 welded part, 210 protruding part, 212 holed part , 214 no hole, 216 no hole, 220 resin layer, 222 upper surface, 224 lower surface, 226 inner surface, 230 metal layer, 240 metal layer, 250 hole, 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 Top surface, 324 Bottom surface, 326 Inner surface, 330 Metal layer, 340 Metal layer, 350 Hole, 360 Metal layer, 380 Laminated body, 400 Manufacturing system, 402 Information acquisition unit, 404 Design department, 406 Preparation unit, 408 Hole forming unit, 410 Current collector manufacturing unit, 412 Lamination unit, 414 Tab installation unit, 416 Battery manufacturing 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 (31)

a preparation step for preparing a resin layer;
A forming step of forming a hole penetrating from the upper surface to the lower surface of the resin layer, when metal is formed on the inner surface of the hole, the resistance of the hole per 1 Ah of 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,
The current collector is manufactured by forming a metal on the resin layer to produce the current collector 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 manufacturing method comprising: a body manufacturing step; The manufacturing method according to claim 1, wherein the hole is circular or oval. The manufacturing method according to claim 2, wherein the hole is circular and has a diameter of 10 to 300 μm. The manufacturing method according to claim 3, wherein the diameter of the hole is 50 to 150 μm. Any one of claims 1 to 4, wherein in the forming step, when forming a plurality of holes in the resin layer, the plurality of holes are formed such that a center-to-center distance between adjacent holes is 20 to 500 μm. The manufacturing method according to item 1. Any one of claims 1 to 4, wherein in the forming step, when forming a plurality of holes in the resin layer, the plurality of holes are formed such that a center-to-center distance between adjacent holes is 60 to 350 μm. The manufacturing method according to item 1. The resin layer has a thickness of 1 to 10 μm, the upper metal layer has a thickness of 0.1 to 2.0 μm, and the lower metal layer has a thickness of 0.1 to 2.0 μm. 7. The manufacturing method according to any one of 1 to 6. The resin layer has a thickness of 3 to 7 μm, the upper metal layer has a thickness of 0.3 to 1.0 μm, and the lower metal layer has a thickness of 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 acquisition 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,
The manufacturing method according to any one of claims 1 to 10, wherein in the forming step, the holes having the size and number determined in the designing step are formed in the resin layer. The current collector manufacturing step includes manufacturing a plurality of negative electrode current collectors,
The manufacturing method includes:
a laminating step of laminating 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 and resistance welding the protruding portions of the plurality of negative electrode current collectors on which the negative electrode mixture is not stacked between the negative electrode tabs and negative electrode sub tabs;
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 tab, and the negative electrode Sub tab. The manufacturing method according to any one of claims 1 to 10, comprising: a battery manufacturing step. The current collector manufacturing step includes manufacturing the plurality of positive electrode current collectors,
In the tab installation step, the protruding portions of the plurality of positive electrode current collectors on which the positive electrode mixture is not laminated are sandwiched between a positive electrode tab and a positive electrode sub tab and resistance welded;
The battery manufacturing process includes 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 tab, the negative electrode Sub tab, 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 includes:
a laminating step of laminating 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 and resistance welding the protruding portions of the plurality of positive electrode current collectors on which the positive electrode mixture is not stacked between the positive electrode tabs and the positive electrode sub tabs;
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 tab, and the positive electrode sub tab. The manufacturing method according to any one of claims 1 to 10, comprising: a battery manufacturing step. The laminating step includes 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 so that the number of layers of the plurality of positive electrode current collectors is at least three. The manufacturing method according to any one of claims 12 to 14, comprising laminating a plurality of separators. The manufacturing method according to any one of claims 12 to 15, wherein in the forming step, the hole is formed in a region of the resin layer corresponding to the protrusion. 14. The manufacturing method according to claim 12, wherein in the forming step, the hole is formed in a region of the resin layer sandwiched between the negative electrode tab and the negative electrode sub tab. 18. The manufacturing method according to claim 17, wherein the forming step includes forming 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 producing the negative electrode current collector. Method. 15. The manufacturing method according to claim 13, wherein in the forming step, the hole is formed in a region of the resin layer sandwiched between the positive electrode tab and the positive electrode sub tab. 20. The manufacturing method according to claim 19, wherein in the forming step, when producing the positive electrode current collector, the hole is formed in a region of the resin layer that is resistance welded to the positive electrode tab and the positive electrode sub tab. Method. an acquisition 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,
The manufacturing method according to any one of claims 12 to 20, wherein in the forming step, the holes having the size and number determined in the designing step are formed in the resin layer. The design step is such that the holes formed in each of the protrusions of the plurality of negative electrode current collectors overlap at least in part with the holes of the protrusions of adjacent negative electrode current collectors due to stacking. 22. The manufacturing method according to claim 21, further comprising determining the positions and sizes of the holes, and the spacing between the holes. a preparation step of preparing multiple resin layers;
forming a hole penetrating from the upper surface to the lower surface in each protrusion of the plurality of resin layers;
By forming metal on the resin layer in which 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 generation step of generating a negative electrode current collector;
a laminating step of 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 installation step of sandwiching the protruding portions of the plurality of negative electrode current collectors between a negative electrode tab and a negative electrode sub tab and 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 tab, and the negative electrode Sub tab. Equipped with battery manufacturing process and
In the forming step, the hole is formed in a region of the resin layer sandwiched between the negative electrode tab and the negative electrode sub tab.
Production method. In the current collector generation step, a metal layer is formed on the resin layer in which holes are formed in the forming step, so that the metal layer on the upper surface and the metal layer on the lower surface of the resin layer are formed on the inner surface of the hole. producing a positive electrode current collector electrically connected by metal;
The lamination step includes the plurality of negative electrode current collectors and the plurality of positive electrode current collectors generated in the current collector generation step, the plurality of negative electrode mixtures, the plurality of positive electrode mixtures, and the plurality of positive electrode mixtures. Laminated with separator,
In the tab installation step, the protruding portions of the plurality of positive electrode current collectors are sandwiched between a positive electrode tab and a positive electrode sub tab and resistance welded,
The battery manufacturing process includes 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 tab, the negative electrode Sub tab, producing a battery having the positive electrode tab and the positive electrode sub tab,
24. The manufacturing method according to claim 23, wherein in the forming step, the hole is formed in a region of the resin layer sandwiched between the positive electrode tab and the positive electrode sub tab. a preparation step of preparing multiple resin layers;
forming a hole penetrating from the upper surface to the lower surface in each protrusion of the plurality of resin layers;
By forming metal on the resin layer in which 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 generation step of generating a positive electrode current collector;
a laminating step of 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 installation step of sandwiching the protruding portions of the plurality of positive electrode current collectors between a positive electrode tab and a positive electrode sub tab and 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 tab, and the positive electrode sub tab. Equipped with battery manufacturing process and
In the forming step, the hole is formed in a region of the resin layer sandwiched between the positive electrode tab and the positive electrode sub tab.
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 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 of capacity of the battery in which the current collector is used is , a hole forming part that forms holes with a size and number of 1 mΩ or less;
The current collector is manufactured by forming a metal on the resin layer to produce the current collector 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 manufacturing system comprising a body manufacturing department and. a preparation section that prepares multiple resin layers;
a hole forming part that forms a hole penetrating from the upper surface to the lower surface in each of the protruding parts of the plurality of resin layers;
By forming a metal on the resin layer in which a 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 are electrically connected by the metal on the inner surface of the hole. a current collector manufacturing department that manufactures negative electrode current collectors;
a laminate section that laminates 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 installation part in which the protruding parts of the plurality of negative electrode current collectors are sandwiched between a negative electrode tab and a negative electrode sub tab and resistance welded;
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 tab, and the negative electrode Sub tab. Equipped with a battery manufacturing department and
The hole forming section forms the hole in a region of the resin layer sandwiched between the negative electrode tab and the negative electrode sub tab.
manufacturing system. a preparation section that prepares multiple resin layers;
a hole forming part that forms a hole penetrating from the upper surface to the lower surface in each of the protruding parts of the plurality of resin layers;
By forming a metal on the resin layer in which a 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 are electrically connected by the metal on the inner surface of the hole. a current collector manufacturing department that manufactures positive electrode current collectors;
a laminate section that laminates 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 part in which the protruding parts of the plurality of positive electrode current collectors are sandwiched between a positive electrode tab and a positive electrode sub tab and resistance welded;
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 tab, and the positive electrode sub tab. Equipped with a battery manufacturing department and
The hole forming section forms the hole in a region of the resin layer sandwiched between the positive electrode tab and the positive electrode sub tab.
manufacturing system. A current collector,
a resin layer having at least one hole penetrating from the top surface to the bottom surface;
metal formed on the upper surface and the lower surface of the resin layer and on the inner surface of the hole,
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, and the resistance of the hole per 1 Ah of capacity of the battery in which the current collector is used is 1 mΩ or less,
Current collector. A battery comprising the current collector according to claim 30.

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