JP2010250978A - Method for manufacturing battery electrode, battery electrode, bipolar battery, assembled battery and vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a battery electrode and a battery electrode, which can prevent a collector from corrupting on the occasion of roll press. <P>SOLUTION: The method for manufacturing a battery electrode comprises a reinforcement step of placing a reinforcement part 130 on a collector 120 including an electroconductive resin layer, the reinforcement part having a greater compressive strength than the collector. The method also includes a coating step of applying electrode slurries 150, 160 onto the collector. The reinforcement step is intended to isolate the reinforcement part in a short-axis direction of the longitudinal collector and place the part along a longitudinal direction of the collector. The coating step is intended to apply the electrode slurry in such a manner that the end of the electrode layer 150 is situated on the reinforcement part. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a battery electrode manufacturing method, a battery electrode, a bipolar battery, an assembled battery, and a vehicle.

  In recent years, in order to cope with air pollution and global warming, a reduction in the amount of carbon dioxide has been eagerly desired. In the automobile industry, the amount of carbon dioxide emissions due to the introduction of electric vehicles (EV) and hybrid electric vehicles (HEV) has been reduced. Expectations are gathered for reduction. In such a so-called electric vehicle, it is indispensable to use a power supply device capable of discharging and charging, and various researches and developments have been made on batteries such as lithium ion secondary batteries and nickel / hydrogen secondary batteries.

  The electrodes used in these batteries generally have a configuration in which an electrode layer containing an active material is formed on the surface of a current collector. During production, an electrode slurry containing an active material is applied to the surface of the current collector and dried, and then the current collector is roll-pressed together with the electrode layer (see, for example, Patent Document 1). Metal foil is known as a current collector. However, due to the demand for higher output density and higher capacity density of the battery, further weight reduction of the battery is required, and a collector including a conductive resin layer is required. Electrical bodies have been proposed.

JP-A-10-112320

  However, when the current collector includes a resin layer, the strength is lower than that of the metal foil, and the current collector may not be able to withstand the pressure during roll pressing and may be damaged.

  The present invention has been made to solve such a problem, and an object of the present invention is to provide a battery electrode manufacturing method and a battery electrode that can prevent the current collector from being damaged during roll press. To do.

  The battery electrode manufacturing method of the present invention for achieving the above object has a reinforcing step of disposing a reinforcing portion having a compressive strength higher than that of the current collector on the current collector including the conductive resin layer. The battery electrode manufacturing method of the present invention also includes a coating step of applying electrode slurry to the current collector. In the reinforcing step, the reinforcing portions are spaced apart in the short direction of the long current collector and are disposed along the longitudinal direction of the current collector. In the coating step, the electrode slurry is applied so that the end portion of the electrode layer is positioned on the reinforcing portion.

  The battery electrode of the present invention for achieving the above object includes a current collector including a conductive resin layer and an electrode layer formed on the surface of the current collector. The battery electrode of the present invention also includes a reinforcing portion disposed under a pair of opposing ends of the electrode layer.

  According to the battery electrode manufacturing method of the present invention, since the end of the electrode layer is located on the reinforcing portion, the stress applied to the end of the electrode layer at the time of roll pressing is absorbed by the reinforcing portion and the resin. The current collector including the layer can be prevented from being damaged, and the battery electrode can be continuously produced.

  Since the battery electrode of the present invention has a reinforcing portion disposed below the end portion of the electrode layer, the stress applied to the end portion of the electrode layer is absorbed by the reinforcing portion at the time of roll pressing in manufacturing the battery electrode. The current collector including the resin layer can be prevented from being damaged, and the battery electrode can be continuously manufactured.

(A) is the plane schematic which showed the outline | summary of the battery electrode of 1st Embodiment typically, (B) is the cross-sectional schematic drawing along line 1-1, (C) is the battery electrode of 1st Embodiment. It is the plane schematic which showed the outline | summary typically. It is a flowchart for demonstrating the manufacturing method of the battery electrode of embodiment. (A) is the plane schematic for demonstrating the reinforcement process of 1st Embodiment, (B) is the cross-sectional schematic along 3-3 line. (A) is the plane schematic for demonstrating the coating process of 1st Embodiment, (B) is the cross-sectional schematic drawing along line 4-4, (C) demonstrates the coating process of 1st Embodiment. FIG. It is the perspective view which represented typically the external appearance of the bipolar lithium ion secondary battery. (A) It is a top view of an assembled battery, (B) is a front view of an assembled battery, (C) is a side view of an assembled battery. It is a conceptual diagram of the vehicle carrying an assembled battery. (A) is a schematic plan view schematically showing the outline of the battery electrode of the second embodiment, (B) is a schematic cross-sectional view taken along line 8-8, and (C) is a battery electrode of the second embodiment. It is the plane schematic which showed the outline | summary typically. (A) is the plane schematic for demonstrating the reinforcement process of 2nd Embodiment, (B) is the cross-sectional schematic along 9-9 line. (A) is the plane schematic for demonstrating the coating process of 2nd Embodiment, (B) is the cross-sectional schematic along 10-10 line, (C) demonstrates the coating process of 2nd Embodiment. FIG. (A) is the plane schematic which typically showed the outline | summary of the battery electrode of 3rd Embodiment, (B) is the cross-sectional schematic drawing which follows the 11-11 line, (C) is the battery electrode of 3rd Embodiment. It is the plane schematic which showed the outline | summary typically. (A) is a schematic plan view for explaining the reinforcing step of the third embodiment, (B) is a schematic sectional view taken along the line 12-12, and (C) is for explaining the reinforcing step of the third embodiment. FIG. (A) is the plane schematic for demonstrating the coating process of 3rd Embodiment, (B) is the cross-sectional schematic along 13-13 line | wire, (C) demonstrates the coating process of 3rd Embodiment. FIG. (A) is the plane schematic which showed typically an example of the battery electrode different from embodiment, (B) is the cross-sectional schematic which follows a 14-14 line. (A) is the plane schematic for showing an example of the manufacturing method of the battery electrode different from embodiment, (B) is the cross-sectional schematic which follows 15-15 line. It is a plane schematic diagram for explaining an example different from an embodiment. It is the partial expansion schematic which shows typically an example of the battery electrode different from embodiment. It is the partial expansion schematic of the battery electrode of 1st Embodiment. It is a section schematic diagram expanding and showing an example of a battery electrode different from an embodiment partially. It is a section schematic diagram expanding and showing an example of a battery electrode different from an embodiment partially.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the embodiments described below, members having functions common to the respective embodiments are denoted by similar reference numerals, and redundant description is omitted.

<First Embodiment>
As outlined in FIG. 1, the battery electrode 100 of this embodiment includes a current collector 120 including a conductive resin layer and an electrode layer formed on the surface of the current collector 120. The battery electrode 100 is used for a bipolar lithium ion secondary battery. The battery electrode 100 has a positive electrode layer 110 as an electrode layer on one surface 121 of the current collector 120 and a negative electrode layer 140 as an electrode layer on the other surface 122 of the current collector 120. The battery electrode 100 is also disposed under a pair of opposing ends 112, 114 of the electrode layer, more specifically, between the ends 112, 114 of the positive electrode layer 110 and the current collector 120. A reinforcing part 130 is included.

  The current collector 120 includes a resin layer having conductivity, and preferably includes a resin layer having conductivity. The resin layer is formed of a conductive polymer. The conductive polymer is selected from materials that are conductive and have no conductivity with respect to ions used as charge transfer media. A typical example is a polyene conductive polymer. As another form for the resin layer to have conductivity, a form in which the resin layer contains a resin and a conductive filler can be mentioned. The conductive filler is selected from materials having conductivity. Preferably, from the viewpoint of suppressing ion permeation in the resin layer having conductivity, it is desirable to use a material that does not have conductivity with respect to ions used as the charge transfer medium. Specifically, examples of the conductive filler include aluminum materials, stainless steel (SUS) materials, carbon materials such as graphite and carbon black, silver materials, gold materials, copper materials, and titanium materials.

The positive electrode layer 110 includes a positive electrode active material. The positive electrode layer 110 further includes other additives as necessary. As the positive electrode active material, for example, LiMn ₂ O ₄ , LiCoO ₂ , LiNiO ₂ , Li (Ni—Co—Mn) O _2, and lithium-such as those in which a part of these transition metals are substituted with other elements Examples include transition metal composite oxides, lithium-transition metal phosphate compounds, and lithium-transition metal sulfate compounds. In some cases, two or more positive electrode active materials may be used in combination. Preferably, a lithium-transition metal composite oxide is used as the positive electrode active material from the viewpoint of capacity and output characteristics.

The negative electrode layer 140 includes a negative electrode active material. The negative electrode layer 140 further includes other additives as necessary. Examples of the negative electrode active material include carbon materials such as graphite, soft carbon, and hard carbon, lithium-transition metal composite oxides (for example, Li ₄ Ti ₅ O ₁₂ ), metal materials, lithium alloy negative electrode materials, and the like. . In some cases, two or more negative electrode active materials may be used in combination. Preferably, from the viewpoint of capacity and output characteristics, a carbon material or a lithium-transition metal composite oxide is used as the negative electrode active material.

  The positive electrode layer 110 and the negative electrode layer 140 include a binder. Preferable examples of the binder include polyvinylidene fluoride, polyimide, styrene / butadiene rubber, carboxymethyl cellulose, polypropylene, polytetrafluoroethylene, polyacrylonitrile, and polyamide.

Examples of other additives that can be included in the positive electrode layer 110 and the negative electrode layer 140 include a conductive additive, an electrolyte salt (lithium salt), and an ion conductive polymer. The conductive additive refers to an additive that is blended to improve the conductivity of the positive electrode layer 110 or the negative electrode layer 140. Examples of the conductive assistant include carbon materials such as carbon black such as acetylene black, graphite, and vapor grown carbon fiber. Examples of the electrolyte salt (lithium salt) include Li (C ₂ F ₅ SO ₂ ) ₂ N, LiPF ₆ , LiBF ₄ , LiClO ₄ , LiAsF ₆ , LiCF ₃ SO _{3 and the} like. Examples of the ion conductive polymer include polyethylene oxide (PEO) -based and polypropylene oxide (PPO) -based polymers.

  In order to prevent dendrite precipitation, the area of the negative electrode layer 140 is preferably larger than the area of the positive electrode layer 110, and the outer periphery of the negative electrode layer 140 is located outside the outer periphery of the positive electrode layer 110. Then, the end portions 142 and 144 of the negative electrode layer 140 are at positions where they are supported by the reinforcing portion 130. The positive electrode layer 110 and the negative electrode layer 140 are electrically connected to the current collector 120.

  The reinforcing part 130 has a higher compressive strength than the current collector 120. Further, the heat resistance temperature of the reinforcing portion 130 is preferably larger than the heat resistance temperature of the current collector 120. The reinforcing part 130 is made of, for example, resin. The reinforcing portion 130 can be formed of, for example, nylon 66 (registered trademark), polyacetal, polycarbonate, fluororesin (PTFE), vinylidene fluoride, PPO, polysulfone, ABS, polyethylene, polypropylene, vinyl chloride, phenol resin, or epoxy resin. . Moreover, the reinforcement part 130 may be formed with a metal.

  A method for manufacturing the battery electrode 100 will be described.

  As shown in FIG. 2, the method for manufacturing the battery electrode 100 includes a reinforcing step S <b> 110 in which the reinforcing portion 130 is disposed on the current collector 120. The manufacturing method of the battery electrode 100 also includes a coating step S120 for applying a positive electrode slurry 150 (electrode slurry) containing a positive electrode active material and a negative electrode slurry 160 (electrode slurry) containing a negative electrode active material to the current collector 120; A drying step S130 for drying the slurry 150 and the negative electrode slurry 160. Moreover, the manufacturing method of the battery electrode 100 includes a pressing step S140 for pressing the positive electrode layer 110 and the negative electrode layer 140, and a cutting step S150 for cutting the long current collector 120.

  As shown in FIG. 3, in the reinforcing step S <b> 110, the reinforcing portions 130 are separated in the short direction of the long current collector 120 and arranged along the longitudinal direction of the current collector 120. In the reinforcing step S110, one surface out of one surface 121 of the current collector 120 for forming the positive electrode layer 110 and the other surface 122 of the current collector 120 for forming the negative electrode layer 140. The reinforcing part 130 is arranged at 121. The reinforcing part 130 is fixed to the current collector 120 with an adhesive, for example.

  As shown in FIG. 4, in the coating step S <b> 120, the positive electrode slurry 150 is applied to one surface 121 and the negative electrode slurry 160 is applied to the other surface 122. In the coating step S120, the current collector 120 is conveyed by roll-to-roll, and the positive electrode slurry 150 and the negative electrode slurry 160 are applied by a slit die (not shown). A known technique can be used as the slit die. In the coating step S <b> 120, the positive electrode slurry 150 and the negative electrode slurry 160 are intermittently applied along the longitudinal direction of the current collector 120.

  The positive electrode slurry 150 includes a positive electrode active material, a conductive additive, and a binder as described above, and in addition to these, includes a solvent for adjusting the viscosity. The negative electrode slurry 160 includes a negative electrode active material, a conductive additive, and a binder as described above, and in addition to these, includes a solvent. The solvent contained in the positive electrode slurry 150 and the negative electrode slurry 160 is N-methyl-2-pyrrolidone, for example.

  In the coating step S <b> 120, the positive electrode slurry 150 is applied between the reinforcing portion 130 and the reinforcing portion 130. Here, the length L1a of the positive electrode slurry 150 in the short direction of the current collector 120 (hereinafter simply referred to as the width L1a of the positive electrode slurry 150) is larger than the length L3 between the reinforcing portion 130 and the reinforcing portion 130. (L1a> L3). That is, in the coating step S <b> 120, the positive electrode slurry 150 is applied so that the end portions 112 and 114 of the positive electrode layer 110 are positioned on the reinforcing portion 130.

  In addition, in the coating step S120, the negative electrode slurry 160 is applied so that the end portions 142 and 144 of the negative electrode layer 140 are in positions where the reinforcing portions 130 are supported. Therefore, the length L2a of the negative electrode slurry 160 in the short direction of the current collector 120 (hereinafter simply referred to as the width L2a of the negative electrode slurry 160) is larger than the length L3 between the reinforcing portion 130 and the reinforcing portion 130 (L1a > L3).

  The width L2a of the negative electrode slurry 160 is larger than the width L1a of the positive electrode slurry 150 (L2a> L1a), and the length L2b of the negative electrode slurry 160 is longer than the length L1b of the positive electrode slurry 150 in the longitudinal direction of the current collector 120. Large (L2b> L3b). By applying in this way, the negative electrode layer 140 is formed larger than the positive electrode layer 110.

In the drying step S130, the positive electrode slurry 150 and the negative electrode slurry 160 can be dried by a known technique, for example, dried in a hot air drying furnace (not shown). In the drying step S130, the drying temperature T for drying the positive electrode slurry 150 and the negative electrode slurry 160, the thermal deformation temperature T1 of the current collector 120 (5 kg / cm ² load), and the thermal deformation temperature T2 of the reinforcing portion 130 (5 kg / cm ² load) preferably satisfies the relationship of T1 <T <T2.

  For example, when the drying temperature T is about 140 ° C., the material of the reinforcing portion 130 is preferably nylon 66 (registered trademark), polycarbonate, or the like having a thermal deformation temperature T 2 of 150 ° C. or higher. Moreover, the reinforcement part 130 formed with a metal is also suitable.

  In the pressing step S140, the positive electrode layer 110 and the negative electrode layer 140 are roll-pressed while the current collector 120 is conveyed by roll-to-roll. In the cutting step S150, the long current collector 120 is cut by, for example, a shearing machine (not shown) to form the battery electrode 100. The porosity of the positive electrode layer 110 and the negative electrode layer 140 is adjusted by the roll press. The press pressure of the roll press is 100 MPa, for example. When the compressive strength of the reinforcing part 130 is increased, it is preferable that the reinforcing part 130 is not easily deformed in the pressing step S140. For this reason, it is preferable that the material of the reinforcing portion 130 is appropriately determined in consideration of the pressing pressure in addition to the drying temperature T.

  A bipolar lithium ion secondary battery 30 (bipolar battery) including the battery electrode 100, an assembled battery 40 formed by electrically connecting a plurality of these batteries, and an electric vehicle 50 (vehicle) equipped with the assembled battery 40 will be described.

  As shown in FIG. 5, the bipolar lithium ion secondary battery 30 has a rectangular flat shape, and a positive electrode tab 31 and a negative electrode tab 33 for taking out electric power are drawn out from both ends located in the longitudinal direction. It is.

  The bipolar lithium ion secondary battery 30 has a structure in which a substantially rectangular power generation element 37 in which a charge / discharge reaction actually proceeds is sealed inside a laminate sheet 35 as an exterior material. Specifically, the power generation element 37 is housed and sealed by using the polymer-metal composite laminate sheet 35 as an exterior material and joining all of its peripheral parts by heat fusion. Here, the power generation element 37 has a configuration in which the battery electrode 100 is stacked via an electrolyte. Specifically, the positive electrode layer 110 of one battery electrode 100 and the negative electrode layer 140 of another battery electrode 100 are opposed to each other with the electrolyte interposed therebetween, so that the battery electrode 100, the electrolyte, and the battery electrode 100 are stacked in this order. As the electrolyte, a known one can be applied, and for example, a liquid electrolyte or a polymer electrolyte can be used.

  As shown in FIG. 6, the assembled battery 40 includes a plurality of small-sized assembled batteries 43 electrically connected in series or in parallel with a plurality of bipolar lithium ion secondary batteries 30. It has a connected configuration. Each of the plurality of small assembled batteries 43 can be attached and detached.

  The small assembled battery 43 is electrically connected to each other using a member such as a bus bar, and a plurality of layers are stacked by the connection jig 41. It is necessary to connect how many bipolar lithium ion secondary batteries 30 to make the small assembled battery 43 and how many stages of the small assembled batteries 43 are stacked to make the assembled battery 40. It may be determined according to the battery capacity and output.

  As shown in FIG. 7, the electric vehicle 50 has the assembled battery 40 mounted under the seat in the center of the vehicle body. By mounting it under the seat, the interior space and the trunk room can be widened. The assembled battery 40 can be used as a power source for driving the motor of the electric vehicle 50.

  The effect of the first embodiment will be described.

  Since the battery electrode 100 includes the reinforcing portion 130 disposed below the end portions 112 and 114 of the positive electrode layer 110, the reinforcing portion 130 absorbs stress applied to the end portions 112 and 114 of the positive electrode layer 110 in the pressing step S140. In addition, the current collector 120 made of the resin layer can be prevented from being damaged and can be continuously manufactured.

  Since the battery electrode 100 has the reinforcing portion 130 under the end portions 112 and 114 of the positive electrode layer 110, particularly between the end portions 112 and 114 of the positive electrode layer 110 and the current collector 120, the end portions 112 and 114 are provided. Unlike the case where the reinforcing portion 130 is disposed inside the lower current collector 120, the stress applied to the end portions 112 and 114 of the positive electrode layer 110 in the pressing step S140 can be directly relieved. Further, the manufacturing is easier than the case where the reinforcing portion 130 is disposed inside the current collector 120.

  Since the battery electrode 100 has the reinforcing portion 130 on one surface 121 of the both surfaces 121 and 122 of the current collector 120, the weight and cost can be suppressed as compared with the case where the both surfaces 121 and 122 have the reinforcing portion. .

  In the battery electrode 100, positions where the ends 142 and 144 of the negative electrode layer 140 disposed on the one surface 122 are supported by the reinforcing portion 130 disposed on the other surface 121 opposite to the one surface 122. It is in. For this reason, the battery electrode 100 absorbs the stress applied to the end portions 142 and 144 of the negative electrode layer 140 in the pressing step S140 by the reinforcing portion 130, and can more effectively prevent the current collector 120 from being damaged.

  In the battery electrode 100, the reinforcing part 130 is made of nylon 66 (registered trademark), polycarbonate, or metal, so that the heat resistance of the reinforcing part 130 can be improved, and the shape of the reinforcing part 130 can be maintained in the drying step S130. . Since the battery electrode 100 can maintain the shape of the reinforcing portion 130 even at a high temperature, even if the current collector 120 is placed in a situation where a tension is applied at a high temperature in the drying step S130, the entire current collector 120 is distorted. Etc. can be suppressed.

  According to the method for manufacturing the battery electrode 100, since the end portions 112 and 114 of the positive electrode layer 110 are positioned on the reinforcing portion 130, the stress applied to the end portions 112 and 114 of the positive electrode layer 110 in the pressing step S140. Can be absorbed by the reinforcing portion 130 to prevent the current collector 120 including the resin layer from being damaged, and the battery electrode 100 can be continuously manufactured.

  In the reinforcing step S110, the battery electrode 100 is manufactured by arranging the reinforcing portion 130 in the longitudinal direction of the long current collector 120. Therefore, when transported by roll-to-roll, Even if tension is applied, deformation of the current collector 120 can be suppressed.

  In the manufacturing method of the battery electrode 100, in the reinforcing step S <b> 110, the reinforcing portion 130 is disposed on both surfaces 121 and 122 in order to dispose the reinforcing portion 130 on one surface 121 of the both surfaces 121 and 122 of the current collector 120. Compared to the case, the weight and cost of the battery electrode 100 can be suppressed.

  In the coating process S120, the battery electrode 100 is manufactured by applying the negative electrode slurry 160 so that the ends 142 and 144 of the negative electrode layer 140 are supported by the reinforcing part 130 in the coating process S120. The stress applied to the end portions 142 and 144 of the layer 140 is absorbed by the reinforcing portion 130, and the current collector 120 can be more effectively prevented from being damaged.

  Since the bipolar lithium ion secondary battery 30 includes the battery electrode 100 of the first embodiment, the same effect as that of the battery electrode 100 can be obtained, and stress applied to the end portions 112 and 114 of the positive electrode layer 110 can be reduced during manufacturing. The current collector 120 can be prevented from being damaged by being absorbed by the reinforcing portion 130.

  The assembled battery 40 has a configuration in which a plurality of bipolar lithium ion secondary batteries 30 including the battery electrode 100 are electrically connected. For this reason, the assembled battery 40 has the same effect as the battery electrode 100, and at the time of manufacture, the stress applied to the end portions 112 and 114 of the positive electrode layer 110 is absorbed by the reinforcing portion 130 to prevent the current collector 120 from being damaged. obtain.

  Since the electric vehicle 50 includes the assembled battery 40 including the battery electrode 100, the electric vehicle 50 has the same effect as the battery electrode 100 and absorbs stress applied to the end portions 112 and 114 of the positive electrode layer 110 by the reinforcing portion 130 during manufacturing. Thus, damage to the current collector 120 can be prevented.

<Second Embodiment>
In overview, the second embodiment is substantially the same as the first embodiment, but differs from the first embodiment in that the reinforcing portion is disposed so as to surround the outer periphery of the electrode layer.

  As shown in FIG. 8, in the battery electrode 200 of the second embodiment, the reinforcing portion 230 surrounds the outer periphery of the positive electrode layer 210, and ends 211, 212, 213, 214 of the positive electrode layer 210, the current collector 220, Located between. In addition, all of the end portions 241, 242, 243, and 244 of the negative electrode layer 240 are at positions where they are supported by the reinforcing portion 230.

  As shown in FIG. 9, in the method for manufacturing the battery electrode 200 of the second embodiment, in the reinforcing step S <b> 210 (see FIG. 2), the reinforcing portion 230 is disposed at a position surrounding the outer periphery of the positive electrode layer 210. Then, as shown in FIG. 10, in the coating step S <b> 220, the positive electrode slurry 250 is applied so that the reinforcing portion 230 is located under all of the end portions 211, 212, 213, and 214 of the positive electrode layer 210. Also, in the coating step S <b> 220, the negative electrode slurry 260 is applied so that all of the end portions 241, 242, 243, and 244 of the negative electrode layer 240 are in positions where the reinforcing portions 230 are supported.

  The effect of 2nd Embodiment is described.

  In the battery electrode 200, the reinforcing portion 230 surrounds the outer periphery of the positive electrode layer 210, and absorbs stress applied to all the end portions 211, 212, 213, and 214 of the positive electrode layer 210 in the pressing step S240. For this reason, in addition to the effect of 1st Embodiment, the electrode 200 for batteries has the effect that the damage of the electrical power collector 220 can be prevented much more effectively.

  In the battery electrode 200, all of the end portions 241, 242, 243, and 244 of the negative electrode layer 240 are in positions where the reinforcing portion 230 is supported. In the pressing step S 240, the reinforcing portion 230 becomes the end portion 241 of the negative electrode layer 240. 242, 243, 244 are all absorbed. For this reason, in addition to the effect of 1st Embodiment, the electrode 200 for batteries has the effect that the damage of the electrical power collector 220 can be prevented much more effectively.

  In the reinforcing step S210, the battery electrode 200 is manufactured by arranging the reinforcing portion 230 at a position surrounding the outer periphery of the positive electrode layer 210, and in the coating step S220, the end portions 211, 212, 213, The positive electrode slurry 250 is applied so that the reinforcing part 230 is located under all of 214. For this reason, in the pressing step S240, the reinforcing portion 230 absorbs stress applied to all of the end portions 211, 212, 213, and 214 of the positive electrode layer 210. Therefore, in addition to the effect of the first embodiment, the method for manufacturing the battery electrode 200 has an effect that the current collector 220 can be more effectively prevented from being damaged.

  In the manufacturing method of the battery electrode 200, in the coating step S220, the negative electrode slurry 260 is applied so that all of the end portions 241, 242, 243, and 244 of the negative electrode layer 240 are supported by the reinforcing portion 230. . For this reason, in press process S240, the reinforcement part 230 absorbs the stress concerning all the edge parts 241, 242, 243, and 244 of the negative electrode layer 240. FIG. Therefore, in addition to the effect of the first embodiment, the method for manufacturing the battery electrode 200 has an effect that the current collector 220 can be more effectively prevented from being damaged.

<Third Embodiment>
The third embodiment is substantially the same as the second embodiment, but the third embodiment differs from the second embodiment in that reinforcing portions are arranged on both sides of the current collector.

  As shown in FIG. 11, in the battery electrode 300, a reinforcing portion 370 is further disposed not only on one surface 321 where the positive electrode layer 310 is disposed, but also on the other surface 322 opposite to the surface 321.

  The reinforcing portion 370 on the negative electrode layer 340 side surrounds the outer periphery of the negative electrode layer 340, and below the end portions 341, 342, 343, and 344 of the negative electrode layer 340, more specifically, the end portions 341, 342 of the negative electrode layer 340, 343 and 344 and the current collector 320 are disposed.

  As shown in FIG. 12, in the method for manufacturing the battery electrode 300, the reinforcing step S <b> 310 (see FIG. 2) not only arranges the reinforcing portion 330 at the position surrounding the positive electrode layer 310 but also at the position surrounding the negative electrode layer 340. Also, the reinforcing portion 370 is arranged. And as shown in FIG. 13, coating process S320 apply | coats the negative electrode slurry 360 so that the reinforcement part 370 may be located under all edge part 341,342,343,344 of the negative electrode layer 340. FIG.

  The effects of the third embodiment will be described.

  The battery electrode 300 has not only the reinforcing portion 330 on the positive electrode layer 310 side but also the reinforcing portion 370 on the negative electrode layer 340 side, and ends 341, 342, 343, and 344 of the negative electrode layer 340 in the pressing step S340. Is directly absorbed by the reinforcing portion 370. For this reason, in addition to the effect of 2nd Embodiment, the electrode 300 for batteries has the effect that damage to the collector 320 can be prevented much more effectively.

  In the reinforcing step S310, the manufacturing method of the battery electrode 300 includes not only arranging the reinforcing portion 330 on one surface 321 for forming the positive electrode layer 310 but also providing the other surface 322 for forming the negative electrode layer 340 on the other surface 322. Also, the reinforcing portion 370 is arranged. For this reason, in the pressing step S340, the reinforcing portion 370 directly absorbs stress applied to the end portions 341, 342, 343, and 344 of the negative electrode layer 340. Therefore, in addition to the effect of the second embodiment, the method for manufacturing the battery electrode 300 has an effect that the current collector 320 can be more effectively prevented from being damaged.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims.

  For example, the bipolar battery is not limited to the stacked type (flat type), and the present invention includes a wound type (cylindrical) bipolar battery.

  Further, the present invention is not limited to the bipolar type, and includes a mode in which the positive electrode layer is disposed on both sides of the current collector and a mode in which the negative electrode layer is disposed on both sides of the current collector, that is, a non-bipolar type. At this time, the battery has a configuration in which a battery electrode in which a positive electrode layer is disposed on both surfaces of a current collector and a battery electrode in which a negative electrode layer is disposed on both surfaces of the current collector are stacked via an electrolyte. Have

  Moreover, this invention is not limited to a lithium ion secondary battery, A sodium ion secondary battery, a potassium ion secondary battery, a nickel hydride secondary battery, a nickel cadmium secondary battery, a nickel hydride battery, etc. are included.

  Moreover, this invention is not limited to the form which a current collector consists of a resin layer which has electroconductivity, The form which a current collector is a multilayer film of a resin-made thin film and a metal thin film is included.

  Moreover, this invention is not limited to the form which arrange | positions a reinforcement part on the surface of an electrical power collector. That is, the present invention includes a form in which the reinforcing portion 430 is disposed inside the current collector 420 as shown in FIGS. 14 and 15, for example. In the embodiment in which the reinforcing portion 430 is disposed inside the current collector 420, there are less irregularities than in the embodiment in which the reinforcing portion is disposed on the surface of the current collector, so that winding is easy when transported by roll-to-roll. Further, in the embodiment in which the reinforcing portion 430 is disposed inside the current collector 420, it is not necessary to consider the close contact between the current collector surface and the reinforcing portion, unlike the embodiment in which the reinforcing portion is disposed on the current collector surface. Processing can be simplified.

  Moreover, this invention is not limited to the form in which a reinforcement part is arrange | positioned continuously, For example, as shown in FIG. 16, the form in which the reinforcement part 530 is arrange | positioned intermittently is included.

  Further, for example, as shown in FIG. 17, the reinforcing portions 630 and 670 may have a configuration in which members 631, 632, 671, and 672 of different materials are combined. In the form shown in FIG. 17, the reinforcing portions 630 and 670 have a two-layer structure. Of the two layers, one 631 and 671 on the current collector 620 side are formed of a relatively rigid material, and the other 632 and 672 are formed of an elastic material. With such a configuration, the reinforcing portions 630 and 670 can follow the contraction and expansion of the electrode layers 610 and 640 during charging and discharging.

  Further, as shown in an enlarged view in FIG. 18, in the reinforcing portion 100 of the first embodiment described above, the cross section in the thickness direction of the current collector 120 is a rectangular shape, but the present invention is not limited to this, and the reinforcing portion 100 The shape of the part can be designed as appropriate. For example, as shown in FIG. 19, the cross-sectional shape of the reinforcing portion is chamfered by one of the four corners 131, 132, 133, and 134 of the reinforcing portion 130 of the first embodiment as shown in FIG. The shape may be sufficient. When the electrode slurry is applied when the cross-sectional shape is rectangular as in the first embodiment, the electrode slurry hardly diffuses at the corners 131 of the reinforcing portion 130, and the gap between the reinforcing portion 130 and the electrode layer 110 is small. There is a tendency for gaps to occur. However, the chamfered shape as shown in FIG. 19 facilitates the diffusion of the electrode slurry, and the reinforcing portion 730 and the electrode layer 710 can be brought into close contact with each other.

  In addition, as shown in FIG. 20, the reinforcing portion 830 may have pores 831. When the reinforcing portion 830 has the pores 831, when the electrode slurry is applied, the electrode slurry enters the pores 831 and is thus easily diffused, and the reinforcing portion 830 and the electrode layer 810 can be brought into close contact with each other.

  In addition, the bipolar battery is not limited to that of the first embodiment, and may include the battery electrode 200 of the second embodiment or the battery electrode 300 of the third embodiment. The assembled battery is not limited to that of the first embodiment, and is a bipolar battery including the battery electrode 200 of the second embodiment, a bipolar battery including the battery electrode 300 of the third embodiment, or a non-battery. A plurality of batteries including bipolar battery electrodes may be electrically connected. The vehicle may be mounted with such an assembled battery.

  In addition, the vehicle is not limited to an electric vehicle. For example, if it is an automobile, it is a hybrid vehicle, a fuel cell vehicle (both four-wheeled vehicles (commercial vehicles such as passenger cars, trucks, buses, light vehicles, etc.), and two-wheeled vehicles (motorcycles). ) And tricycles).

  In addition, the use of the assembled battery is not limited to automobiles. For example, it can be applied to various power sources for moving bodies such as trains, and can be used as a power source for mounting such as an uninterruptible power supply. It is also possible.

100, 200, 300, 400, 600, 700, 800 Battery electrode,
110, 210, 310, 410, 610, 710, 810 positive electrode layer (electrode layer),
112, 114, 211, 212, 213, 214, 311, 312, 313, 314, 412, 414, 614, 714, 814, end of the positive electrode layer,
120, 220, 320, 420, 520, 620, 720, 820 current collector,
121, 221, 321 Current collector surface (one surface),
122, 222, 322 current collector surface (the other surface),
130, 230, 330, 370, 430, 530, 630, 670, 730,
830 reinforcement,
140, 240, 340, 440, 640, 740, 840 negative electrode layer (electrode layer),
142, 144, 242, 244, 341, 342, 343, 344, 442, 444, 644, 744, 844, the end of the negative electrode layer,
150, 250, 350, 450, 550 positive electrode slurry (electrode slurry),
160, 260, 360, 460 negative electrode slurry (electrode slurry),
S110, S210, S310 reinforcing step,
S120, S220, S320 Coating process,
S130, S230, S330 drying process,
S140, S240, S340 pressing process,
S150, S250, S350 cutting process,
30 Bipolar lithium ion secondary battery (bipolar battery),
40 battery packs,
50 Electric car (vehicle).

Claims (15)

A reinforcing part having a compressive strength larger than that of the current collector is separated from the current collector including the conductive resin layer in the short direction of the long current collector, and in the longitudinal direction of the current collector. A reinforcement step to be arranged along,
And a coating step of applying an electrode slurry to the current collector so that an end portion of the electrode layer is positioned on the reinforcing portion. The reinforcing step includes: one surface of the current collector for forming the positive electrode layer as the electrode layer and the other surface of the current collector for forming the negative electrode layer as the electrode layer , Arranging the reinforcing part on the one surface,
The battery electrode manufacturing method according to claim 1, wherein in the coating step, a positive electrode slurry as the electrode slurry is applied to the one surface, and a negative electrode slurry as the electrode slurry is applied to the other surface.   3. The battery electrode according to claim 2, wherein in the coating step, the negative electrode slurry is applied such that an end portion of the negative electrode layer comes to a position supported by a reinforcing portion disposed on the one surface. Production method.   The battery electrode manufacturing method according to claim 2, wherein the reinforcing step includes arranging the reinforcing portion at a position surrounding an outer periphery of the positive electrode layer.   The method for manufacturing a battery electrode according to claim 2, wherein the reinforcing step further includes arranging the reinforcing portion on the other surface. A current collector including a conductive resin layer;
An electrode layer formed on the surface of the current collector;
And a reinforcing portion disposed under a pair of opposed end portions of the electrode layer.   The battery electrode according to claim 6, wherein the reinforcing portion is disposed between an end portion of the electrode layer and the current collector.   A positive electrode layer as the electrode layer is formed on one surface of the current collector, a negative electrode layer as the electrode layer is formed on the other surface of the current collector, and the reinforcing portion is disposed on the one surface The battery electrode according to claim 6 or claim 7.   The battery electrode according to claim 8, wherein an end portion of the negative electrode layer is located at a position supported by the reinforcing portion disposed on the one surface.   The battery electrode according to claim 8, wherein the reinforcing portion surrounds an outer periphery of the positive electrode layer.   The battery electrode according to any one of claims 8 to 10, wherein the reinforcing portion is further arranged on the other surface.   The battery electrode according to any one of claims 6 to 11, wherein the reinforcing portion is made of nylon 66, polycarbonate, or metal.   A bipolar battery comprising the battery electrode according to any one of claims 8 to 11.   An assembled battery formed by electrically connecting a plurality of batteries including the battery electrode according to any one of claims 6 to 12.   A vehicle equipped with the assembled battery according to claim 14 as a motor driving power source.

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