JP6984338B2 - Manufacturing method of power storage module - Google Patents

Description

One aspect of the present invention relates to a method for manufacturing a power storage module.

A secondary battery having a laminated body in which electrodes coated with an active material are laminated on at least one surface of a sheet-shaped current collector is known. For example, Patent Document 1 describes a bipolar battery that surrounds a cell and has a resin seal layer provided between current collectors. In this bipolar battery, adjacent seal layers are bonded to each other by thermal pressure.

Japanese Patent No. 4370902

When the seal layers are bonded to each other by heat pressurization, the laminated seal layers are pressurized in the stacking direction by the heater. Therefore, it takes time for the heat to reach the seal layer farthest from the heater. In particular, when the number of stacked bipolar battery plates is large, heat may not be transferred well to the seal layer farthest from the heater, and the seal layer may not be sufficiently melted. In that case, the sealing property between the current collector and the sealing layer may be deteriorated.

One aspect of the present invention is to provide a method for manufacturing a power storage module capable of improving the sealing property between a current collector plate and a resin portion.

The method for manufacturing a power storage module according to one aspect of the present invention includes a current collector plate having irregularities formed on at least one surface, a positive electrode provided on the first surface of the current collector plate, and a second collector plate. This is a method for manufacturing a power storage module in which a plurality of bipolar electrodes including a negative electrode provided on a surface are laminated, and a plurality of the edges of the current collector plate and the first resin portion are alternately arranged. After the laminating step of laminating the current collector plate and the plurality of the first resin portions, and after the laminating step, the plurality of current collectors are collected by applying ultrasonic vibration to the laminated first resin portions. The present invention includes a welding step of welding the plurality of first resin portions to the edge portion of the electric plate.

In this method of manufacturing a power storage module, ultrasonic vibration is instantaneously transmitted to each first resin portion, so that each first resin portion melts almost at the same time. Therefore, the first resin portion farthest from the supply portion of the ultrasonic vibration can be sufficiently melted. Therefore, the sealing property between the current collector plate and the first resin portion can be improved as compared with the heat pressurization.

The first surface and the second surface of the current collector plate have a rectangular shape, and in the welding step, the first resin portion is simultaneously attached to the edge of the current collector plate on a plurality of sides of the rectangular shape. It may be welded to the portion. In this case, welding can be performed at high speed.

In the method for manufacturing the power storage module, after the welding step, a step of forming a second resin portion covering the outer surface of the plurality of first resin portions extending in the stacking direction of the first resin portion by injection molding is performed. Further may be included. In this case, since the sealing property between the adjacent first resin portions can be enhanced by the second resin portion, the sealing property of the power storage module can be enhanced.

According to one aspect of the present invention, there can be provided a method for manufacturing a power storage module capable of improving the sealing property between the current collector plate and the resin portion.

It is a schematic sectional drawing which shows the electric power storage apparatus which comprises the electric power storage module which concerns on one Embodiment. FIG. 3 is a schematic cross-sectional view showing a power storage module constituting the power storage device of FIG. 1. It is a figure which shows the schematic structure of the manufacturing apparatus of the power storage module which concerns on one Embodiment. It is a flowchart of the manufacturing method of the power storage module which concerns on one Embodiment. It is sectional drawing which shows the stacking process of the manufacturing method of the power storage module which concerns on one Embodiment. It is sectional drawing which shows the welding process of the manufacturing method of the power storage module which concerns on one Embodiment. It is a figure for demonstrating the welding process. It is a figure which shows an example of the current collector plate and the 1st resin part seen from the direction orthogonal to the 1st surface of a current collector plate.

Hereinafter, a method for manufacturing the power storage module according to the embodiment will be described in detail with reference to the drawings. In the description of the drawings, the same elements are designated by the same reference numerals, and duplicate description will be omitted. The drawings show the XYZ Cartesian coordinate system as needed.

FIG. 1 is a schematic cross-sectional view showing an embodiment of a power storage device including a power storage module. The power storage device 10 shown in the figure is used as a battery for various vehicles such as forklifts, hybrid vehicles, and electric vehicles. The power storage device 10 includes a plurality of (three in this embodiment) power storage modules 12, but may include a single power storage module 12. The power storage module 12 is, for example, a bipolar battery. The power storage module 12 is a secondary battery such as a nickel hydrogen battery or a lithium ion secondary battery, but may be an electric double layer capacitor. In the following description, a nickel metal hydride battery will be illustrated.

The plurality of power storage modules 12 may be laminated via a conductive plate 14 such as a metal plate. Seen from the stacking direction D1, the power storage module 12 and the conductive plate 14 have, for example, a rectangular shape. Details of each power storage module 12 will be described later. The conductive plates 14 are also arranged on the outside of the power storage modules 12 located at both ends in the stacking direction D1 (Z direction) of the power storage modules 12. The conductive plate 14 is electrically connected to the adjacent power storage modules 12. As a result, the plurality of power storage modules 12 are connected in series in the stacking direction D1. In the stacking direction D1, the take-out portion 24 is connected to the conductive plate 14 located at one end, and the take-out portion 26 is connected to the conductive plate 14 located at the other end. The take-out portion 24 may be integrated with the conductive plate 14 to be connected. The take-out portion 26 may be integrated with the conductive plate 14 to be connected. The take-out portion 24 and the take-out portion 26 extend in a direction (X direction) intersecting the stacking direction D1. The power storage device 10 can be charged and discharged by the take-out unit 24 and the take-out unit 26.

The conductive plate 14 can also function as a heat radiating plate for releasing the heat generated in the power storage module 12. By allowing a refrigerant such as air to pass through the plurality of voids 14a provided inside the conductive plate 14, the heat from the power storage module 12 can be efficiently discharged to the outside. Each void 14a extends, for example, in a direction (Y direction) intersecting the stacking direction D1. The conductive plate 14 is smaller than the power storage module 12 when viewed from the stacking direction D1, but may be the same as or larger than the power storage module 12.

The power storage device 10 may include a restraint member 16 that restrains the alternately stacked power storage modules 12 and the conductive plates 14 in the stacking direction D1. The restraint member 16 includes a pair of restraint plates 16A and 16B, and a connecting member (bolt 18 and nut 20) for connecting the restraint plates 16A and 16B to each other. An insulating film 22 such as a resin film is arranged between the restraint plates 16A and 16B and the conductive plate 14. Each of the restraint plates 16A and 16B is made of a metal such as iron. Seen from the stacking direction D1, each of the restraint plates 16A and 16B and the insulating film 22 has, for example, a rectangular shape. The insulating film 22 is larger than the conductive plate 14, and the restraint plates 16A and 16B are larger than the power storage module 12. When viewed from the stacking direction D1, an insertion hole H1 through which the shaft portion of the bolt 18 is inserted is provided at a position outside the power storage module 12 at the edge portion of the restraint plate 16A. Similarly, when viewed from the stacking direction D1, an insertion hole H2 through which the shaft portion of the bolt 18 is inserted is provided at a position outside the power storage module 12 at the edge portion of the restraint plate 16B. When the restraint plates 16A and 16B have a rectangular shape when viewed from the stacking direction D1, the insertion holes H1 and the insertion holes H2 are located at the corners of the restraint plates 16A and 16B.

One restraint plate 16A is abutted against the conductive plate 14 connected to the take-out portion 26 via the insulating film 22, and the other restraint plate 16B has the insulating film 22 attached to the conductive plate 14 connected to the take-out portion 24. It is struck through. For example, the bolt 18 is passed through the insertion hole H1 from one restraint plate 16A side toward the other restraint plate 16B side, and a nut 20 is screwed into the tip of the bolt 18 protruding from the other restraint plate 16B. There is. As a result, the insulating film 22, the conductive plate 14, and the power storage module 12 are sandwiched and unitized, and a restraining load is applied to the stacking direction D1.

FIG. 2 is a schematic cross-sectional view showing a power storage module constituting the power storage device of FIG. The power storage module 12 shown in the figure includes a laminated body 30 in which a plurality of bipolar electrodes 32 are laminated. The laminated body 30 has, for example, a rectangular shape when viewed from the stacking direction D1 of the bipolar electrode 32. A separator 40 may be arranged between adjacent bipolar electrodes 32.

The bipolar electrode 32 includes an electrode plate 34 (current collector plate), a positive electrode 36 provided on the first surface 34b of the electrode plate 34, and a negative electrode 38 provided on the second surface 34c of the electrode plate 34. In the laminate 30, the positive electrode 36 of one bipolar electrode 32 faces the negative electrode 38 of one of the bipolar electrodes 32 adjacent to the stacking direction D1 with the separator 40 interposed therebetween, and the negative electrode 38 of one bipolar electrode 32 is the separator 40. It faces the positive electrode 36 of the other bipolar electrode 32 adjacent to each other in the stacking direction D1. In the stacking direction D1, an electrode plate 34 (negative electrode side terminal electrode) in which a negative electrode 38 is arranged on an inner side surface is arranged at one end of the laminated body 30, and a positive electrode 36 is arranged on the inner side surface at the other end of the laminated body 30. The arranged electrode plate 34 (positive electrode side terminal electrode) is arranged. The negative electrode 38 of the negative electrode side terminal electrode faces the positive electrode 36 of the uppermost bipolar electrode 32 via the separator 40. The positive electrode 36 of the positive electrode side terminal electrode faces the negative electrode 38 of the lowermost bipolar electrode 32 via the separator 40. The electrode plates 34 of these terminal electrodes are connected to adjacent conductive plates 14 (see FIG. 1).

The power storage module 12 includes a frame body 50 that holds the edge portion 34a of the electrode plate 34 on the side surface 30a of the laminated body 30 extending in the stacking direction D1. The frame body 50 is configured to surround the side surface 30a of the laminated body 30. The frame body 50 may include a first resin portion 52 that holds the edge portion 34a of the electrode plate 34, and a second resin portion 54 that is provided around the first resin portion 52 when viewed from the stacking direction D1.

The first resin portion 52 constituting the inner wall of the frame body 50 is provided from the first surface 34b (the surface on which the positive electrode 36 is formed) of the electrode plate 34 of each bipolar electrode 32 to the end surface of the electrode plate 34 at the edge portion 34a. ing. Seen from the stacking direction D1, each first resin portion 52 is provided over the entire circumference of the edge portion 34a of the electrode plate 34 of each bipolar electrode 32. The adjacent first resin portions 52 are in contact with each other on a surface extending to the outside of the second surface 34c (the surface on which the negative electrode 38 is formed) of the electrode plate 34 of each bipolar electrode 32. As a result, similarly to the electrode plates 34 of each bipolar electrode 32, the edge portions 34a of the electrode plates 34 arranged on both sides of the laminated body 30 are also held in a state of being embedded in the first resin portion 52. As a result, a plurality of internal spaces V airtightly partitioned by the electrode plates 34, 34 and the first resin portion 52 are formed between the electrode plates 34, 34 adjacent to each other in the stacking direction D1. The internal space V contains an electrolytic solution (not shown) composed of an alkaline solution such as an aqueous potassium hydroxide solution.

The second resin portion 54 constituting the outer wall of the frame body 50 is a tubular portion extending with the stacking direction D1 as the axial direction. The second resin portion 54 extends over the entire length of the laminated body 30 in the stacking direction D1. The second resin portion 54 covers the outer surface 52s of the first resin portion 52 extending in the stacking direction D1. The second resin portion 54 is welded to the first resin portion 52 inside when viewed from the stacking direction D1. The second resin portion 54 is welded to the outer surface 52s of the first resin portion 52, for example, by heat during injection molding.

The first resin portion 52 and the second resin portion 54 are formed in a rectangular tubular shape, for example, by an insulating resin having alkali resistance. Examples of the resin material constituting the first resin portion 52 and the second resin portion 54 include polypropylene (PP), polyphenylene sulfide (PPS), modified polyphenylene ether (modified PPE), and the like.

The electrode plate 34 is made of metal, and is made of, for example, nickel or a plate in which the surface of a steel plate is nickel-plated. The electrode plate 34 is, for example, a rectangular metal plate made of nickel, but may be a metal foil. The edge portion 34a of the electrode plate 34 is an uncoated region in which the positive electrode active material and the negative electrode active material are not coated, and the uncoated region is buried in the first resin portion 52 constituting the inner wall of the frame body 50. It is an area that is held. Examples of the positive electrode active material constituting the positive electrode 36 include nickel hydroxide. Examples of the negative electrode active material constituting the negative electrode 38 include a hydrogen storage alloy. The formation region of the negative electrode 38 on the second surface 34c of the electrode plate 34 is slightly larger than the formation region of the positive electrode 36 on the first surface 34b of the electrode plate 34. Concavities and convexities are formed on at least one surface (first surface 34b or second surface 34c) of the electrode plate 34. The unevenness is formed on the surface of the electrode plate 34 at the edge portion 34a. In the present embodiment, both the first surface 34b and the second surface 34c are electroplated, so that unevenness is formed on both the first surface 34b and the second surface 34c. The range to be electroplated may be all of the first surface 34b and the second surface 34c, or a part of the first surface 34b and the second surface 34c (of the first surface 34b and the second surface 34c). It may be a portion at the edge portion 34a).

The separator 40 is formed, for example, in the form of a sheet. Examples of the material for forming the separator 40 include a porous film made of a polyolefin resin such as polyethylene (PE) and polypropylene (PP), a woven cloth made of polypropylene or the like, or a non-woven fabric. Further, the separator 40 may be reinforced with a vinylidene fluoride resin compound or the like.

Next, the manufacturing apparatus 70 (hereinafter, also simply referred to as “manufacturing apparatus”) of the power storage module 12 used in the above-mentioned manufacturing method of the power storage module 12 will be described. The manufacturing device 70 is a device (ultrasonic welding device) for manufacturing the power storage module 12, and is a device for welding the first resin portion 52 and the edge portion 34a of the electrode plate 34 by ultrasonic waves.

FIG. 3 is a diagram showing a schematic configuration of a power storage module manufacturing apparatus according to an embodiment. As shown in FIG. 3, the manufacturing apparatus 70 includes an anvil 71, an ultrasonic wave generating unit 72, a horn 75, a driving unit 74, and a controller 80. The anvil 71 is arranged so as to face the tip of the horn 75. In the following, the facing direction between the anvil 71 and the horn 75 is the vertical direction.

The anvil 71 has a mounting surface 71a on which the object of ultrasonic welding is placed. The welding target is, for example, a laminated unit U (see FIG. 5) in which the electrode plates 34 and the first resin portion 52 are alternately arranged. The mounting surface 71a is made of a highly rigid metal such as SUS.

The ultrasonic wave generating unit 72 generates ultrasonic vibration by, for example, an ultrasonic vibrator composed of a piezo element. The ultrasonic wave generating unit 72 generates vibration in the vertical direction, for example. The ultrasonic wave generation unit 72 adjusts the amplitude with a booster, and then inputs ultrasonic vibration to the horn 75.

The horn 75 is connected to the ultrasonic wave generating section 72, and transmits the ultrasonic vibration generated in the ultrasonic wave generating section 72 to the first resin section 52 to be welded. The horn 75 is made of a metal material such as aluminum or titanium.

The drive unit 74 is, for example, an air cylinder, and the horn 75 is attached to the piston of the air cylinder so as to be vertically movable. The drive unit 74 drives the horn 75 downward toward the welding target, thereby pressing the horn 75 against the first resin unit 52 with a predetermined load.

The controller (control unit) 80 controls the ultrasonic wave generation unit 72 and the drive unit 74. The controller 80 is composed of a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), an input / output interface, and the like. Various programs or data are stored in the ROM. In the controller 80 of the present embodiment, for example, the first resin portion 52 arranged on the edge portion 34a of the electrode plate 34 is pressed by the horn 75, and the first resin portion 52 is ultrasonically vibrated via the horn 75. The ultrasonic wave generating unit 72 and the driving unit 74 are controlled so as to apply the above.

FIG. 4 is a flowchart of a method for manufacturing a power storage module according to an embodiment. As shown in FIG. 4, the method for manufacturing the power storage module 12 of the present embodiment may include an unevenness forming step S1, a laminating step S2, a welding step S3, and a sealing step S4.

In the unevenness forming step S1, unevenness is formed on the first surface 34b and the second surface 34c of the electrode plate 34. The unevenness is formed on the surface (first surface 34b and second surface 34c) to which the first resin portion 52 is welded at the edge portion 34a. The unevenness may be formed on the end surface of the electrode plate 34 connecting the first surface 34b and the second surface 34c. The unevenness is formed by, for example, an electric field plating process. The size of the unevenness is not particularly limited, but if the thickness of the electrode plate 34 is 0.1 μm to 1000 μm, the size of the unevenness can be set to 0.1 μm to 30 μm. After that, the positive electrode active material layer is formed on the first surface 34b of the electrode plate 34, and the negative electrode active material layer is formed on the second surface 34c. As a result, the bipolar electrode 32 is obtained.

After the unevenness forming step S1, the laminating step S2 is performed. In the laminating step S2, as shown in FIG. 5, the plurality of electrode plates 34 and the plurality of first resin portions 52 are laminated so that the electrode plates 34 and the first resin portion 52 are alternately arranged. The number of laminated electrode plates 34 is, for example, 5 to 30. In the present embodiment, a plurality of bipolar electrodes 32 and an electrode plate 34 as a terminal electrode are laminated. The first resin portion 52 may be a frame body extending along the edge portion 34a of the electrode plate 34. In this case, by performing the welding step S3 described later, the electrode plate 34 and the first resin portion 52 are firmly bonded to each other at all the portions of the edge portion 34a of the electrode plate 34. In the laminating step S2, the first resin portion 52 may be attached only to the first surface 34b of each electrode plate 34, or the first resin portion 52 may be attached to the first surface 34b and the second surface 34c of each electrode plate 34, respectively. May be attached. In the laminating step S2, the separator 40 is arranged between the adjacent electrode plates 34. The separator 40 is surrounded by the first resin portion 52. In this way, the laminated unit U in which the bipolar electrode 32, the electrode plate 34 as the terminal electrode, the separator 40, and the first resin portion 52 are laminated is formed.

After the laminating step S2, the welding step S3 is performed. The welding step S3 can be performed using the above-mentioned manufacturing apparatus 70. In the welding step S3, as shown in FIG. 6, by applying ultrasonic vibration to the laminated unit U (particularly, the laminated first resin portion 52), a plurality of first portions 34a of the plurality of electrode plates 34 are subjected to ultrasonic vibration. 1 Resin portions 52 are welded to each other. The ultrasonic vibration may be, for example, ultrasonic vibration in the stacking direction of the plurality of bipolar electrodes 32, or may be ultrasonic vibration in the direction intersecting the stacking direction. Specifically, in a state where the first resin portion 52 arranged in a frame shape on the edge portion 34a of the electrode plate 34 is pressed by the horn 75, ultrasonic vibration is applied to the first resin portion 52 via the horn 75. .. First, the ultrasonic wave generation unit 72 generates ultrasonic vibration to vibrate the horn 75. Subsequently, the drive unit 74 moves the horn 75 downward toward the first resin unit 52, and presses the horn 75 against the first resin unit 52 with a predetermined load. The horn 75 applies the vibration energy of the ultrasonic vibration generated in the ultrasonic wave generation unit 72 to each first resin unit 52. The ultrasonic vibration is instantaneously transmitted from the first resin portion 52 closest to the horn 75 to the first resin portion 52 farthest from the horn 75. Between the adjacent first resin portions 52, the ultrasonic vibration can be transmitted from one first resin portion 52 to the other first resin portion 52 via the edge portion 34a of the electrode plate 34. As a result, heat (friction heat) due to friction is generated at the boundary surface between each first resin portion 52 and the electrode plate 34, and the temperature of the first resin portion 52 rises. As a result, the first resin portion 52 is melted. After that, the generation of ultrasonic vibration by the ultrasonic wave generating section 72 is stopped, and the temperature of the first resin section 52 is lowered in a state where the first resin section 52 is pressurized. As a result, the first resin portion 52 changes from a molten state (liquid) to a solidified state (solid), and the first resin portion 52 is welded to the edge portion 34a. Each first resin portion 52 is welded to the electrode plates 34 located on both sides thereof. That is, each of the first resin portions 52 has a second surface 34c of the electrode plate 34 located above the first resin portion 52 and a first surface of the electrode plate 34 located below the first resin portion 52. It is welded to 34b, respectively. In this case, the internal space V (see FIG. 2) surrounded by one first resin portion 52 and the electrode plates 34 located on both sides thereof can be sealed without performing the sealing step S4 described later. Further, in the sealing step S4 described later, even if the molten second resin portion 54 presses the electrode plates 34 in a direction orthogonal to the stacking direction of the electrode plates 34, the adjacent electrode plates 34 are connected to each other in the first resin portion. Since it is fixed by 52, the position of the electrode plate 34 is unlikely to shift.

The timing of driving by the driving unit 74 and the timing of ultrasonic vibration generation by the ultrasonic wave generating unit 72 are not limited to the above-mentioned contents. Further, the melted first resin portion 52 may move downward due to gravity to fill the space between the adjacent first resin portions 52. As a result, as shown in FIG. 2, the solidified adjacent first resin portions 52 may be welded to each other.

The case where the first surface 34b of the electrode plate 34 is roughened will be described in detail with reference to FIGS. 7 (A) and 7 (B). As shown in FIGS. 7A and 7B, the first surface 34b of the electrode plate 34 is roughened to form a plurality of protrusions 34d. The protrusion 34d may have, for example, a shape that becomes thicker from the proximal end side toward the distal end side. 7 (A) and 7 (B) are schematic views, and the shape and density of the protrusions 34d are not particularly limited. FIG. 7A shows the first resin portion 52 and the electrode plate 34 before ultrasonic welding. FIG. 7B shows the first resin portion 52 and the electrode plate 34 after ultrasonic welding. The first resin portion 52 melted by the ultrasonic vibration enters the recess between the protrusions 34d, and the anchor effect is exhibited. Similarly, when the second surface 34c of the electrode plate 34 is roughened, the anchor effect is exhibited between the second surface 34c of the electrode plate 34 and the first resin portion 52.

FIG. 8 is a diagram showing an example of the electrode plate 34 and the first resin portion 52 viewed from a direction orthogonal to the first surface 34b of the electrode plate 34. As shown in FIG. 8, the first surface 34b and the second surface 34c of the electrode plate 34 have, for example, a rectangular shape. In this case, the first resin portion 52 may be welded to the edge portion 34a of the electrode plate 34 at the same time on a plurality of sides of the rectangular shape. The first resin portion 52 may be welded to the edge portion 34a at the same time on two adjacent sides or two facing sides of a rectangular shape, or the first resin portion 52 may be welded to the edge portion 34a at the same time on four sides. ..

After the welding step S3, the sealing step S4 is performed. In the sealing step S4, the second resin portion 54 covering the outer surface 52s of the plurality of first resin portions 52 is formed by injection molding (see FIG. 2). Subsequently, the electrolytic solution is injected into the internal space V from the liquid injection ports provided in the first resin portion 52 and the second resin portion 54. After that, the injection port is sealed by, for example, a pressure regulating valve or the like. In this way, the power storage module 12 shown in FIG. 2 is manufactured.

As described above, according to the method for manufacturing the power storage module 12 of the above embodiment, the ultrasonic vibration is instantaneously transmitted to each first resin portion 52, so that each first resin portion 52 melts almost at the same time. Therefore, the first resin portion 52 farthest from the horn 75, which is the supply portion of the ultrasonic vibration, can be sufficiently melted. Therefore, the sealing property between the electrode plate 34 and the first resin portion 52 can be improved as compared with the thermal pressurization. That is, a more robust sealing state can be ensured between the electrode plate 34 and the first resin portion 52. Further, in the method for manufacturing the power storage module 12 of the above embodiment, since the plurality of first resin portions 52 are welded to the edge portions 34a of the plurality of electrode plates 34 at almost the same time, one first resin portion 52 is used as one electrode. Compared with the case of welding to the edge portion 34a of the plate 34, the time of the welding step S3 can be significantly shortened.

Further, in the welding step S3, the first surface 34b and the second surface 34c of the electrode plate 34 have a rectangular shape, and the first resin portion 52 is simultaneously attached to the edge portion of the electrode plate 34 on a plurality of sides of the rectangular shape. It may be welded to 34a. In this case, welding can be performed at high speed.

Further, the sealing step S4 may be performed after the welding step S3. In this case, since the second resin portion 54 can improve the sealing property between the adjacent first resin parts 52, the sealing property of the power storage module 12 can be improved.

Although the preferred embodiment of the present invention has been described in detail above, the present invention is not limited to the above embodiment.

For example, in the above embodiment, the example in which the unevenness is formed on both the first surface 34b and the second surface 34c of the electrode plate 34 has been described, but the unevenness may be formed only on the first surface 34b. In this case, each first resin portion 52 is welded to the first surface 34b of the electrode plate 34. Similarly, unevenness may be formed only on the second surface 34c. In this case, each first resin portion 52 is welded to the second surface 34c of the electrode plate 34.

In the above embodiment, the method of manufacturing the power storage module 12 has been described with reference to an example including the unevenness forming step S1, but the method of manufacturing the power storage module 12 is formed by the unevenness forming step S1 instead of the unevenness forming step S1. A preparatory step for preparing an electrode plate 34 having irregularities equivalent in size may be included.

In the above embodiment, an example of laminating all the electrode plates 34 to form one laminating unit U in the laminating step S2 has been described, but all the electrode plates 34 are divided into a plurality of groups for each group. The laminated unit U may be formed. In this case, after performing the welding step S3 for each of the plurality of laminated units U, the plurality of laminated units U are welded to each other. As a result, even if the number of laminated electrode plates 34 increases, the welding step S3 can be performed without significantly changing the welding conditions.

12 ... Energy storage module, 32 ... Bipolar electrode, 34 ... Electrode plate (current collector plate), 34a ... Edge, 34b ... First surface, 34c ... Second surface, 36 ... Positive electrode, 38 ... Negative electrode, 52 ... First resin Part, 54 ... Second resin part.

Claims (3)

A plurality of bipolar electrodes including a current collector plate having irregularities formed on at least one surface, a positive electrode provided on the first surface of the current collector plate, and a negative electrode provided on the second surface of the current collector plate. Is a method of manufacturing a current collector module in which
A laminating step of laminating a plurality of the current collector plates and a plurality of the first resin portions so that the edge portions of the current collector plates and the first resin portions are alternately arranged.
After the laminating step, a welding step of welding the plurality of first resin portions to the edges of the plurality of current collector plates by applying ultrasonic vibration to the plurality of laminated first resin portions. When,
Only including,
In the welding step, the ultrasonic vibration applied in the stacking direction of the plurality of first resin portions is passed through the edge portions of the current collector plates alternately arranged with the first resin portions in the stacking direction. A method for manufacturing a power storage module, which is transmitted to each of the first resin portions arranged in the same direction, and each of the first resin portions is welded to the edges of the current collector plates located on both sides of the stacking direction. The first surface and the second surface of the current collector plate have a rectangular shape.
The method for manufacturing a power storage module according to claim 1, wherein in the welding step, the first resin portion is welded to the edge portion of the current collector plate at the same time on a plurality of sides of the rectangular shape. After the welding step, before further includes the step of forming by injection molding a second resin portion for covering the outer surface of the first resin part of said plurality extending in miracle layer direction, according to claim 1 or 2 Manufacturing method of power storage module.

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