JP6787254B2 - Power storage module manufacturing equipment and manufacturing method - Google Patents

Description

The present invention relates to a manufacturing apparatus and a manufacturing method of a power storage module.

A bipolar battery having a laminate in which a bipolar electrode including an electrode plate, a positive electrode provided on one surface of the electrode plate, and a negative electrode provided on the other surface of the electrode plate is laminated is known (for example, the following patent). Document 1). In the bipolar battery, the laminate is surrounded by a resin sealing material (frame). In this way, the power storage module is configured by surrounding the laminated body with the frame body.

Japanese Unexamined Patent Publication No. 2012-234823

The frame of the power storage module described above is a cylinder provided around a plurality of first resin portions holding the edges of the electrode plates of the bipolar battery and a plurality of first resin portions when viewed from the stacking direction of the laminate. In the case of the configuration including the shape of the second resin portion, the second resin portion can be formed by insert molding. That is, the resin material constituting the second resin portion is injected into the mold in a state where the electrode laminate in which a plurality of bipolar electrodes provided with the first resin portion are stacked is arranged in the mold. 2 Resin parts can be obtained.

As a result of diligent research, the inventors have found that it is difficult to properly form the second resin part as designed by insert molding when there is a dimensional tolerance or stacking deviation of the first resin part, and the resin is sufficiently formed. It was found that there may be a problem that the resin cannot be injected or the resin significantly deforms the first resin portion.

Therefore, an object of the present invention is to provide a manufacturing apparatus and a manufacturing method of a power storage module in which the shape accuracy of the frame of the power storage module is improved.

In the power storage module manufacturing apparatus according to one aspect of the present invention, a plurality of bipolar electrodes including an electrode plate, a positive electrode provided on one surface of the electrode plate, and a negative electrode provided on the other surface of the electrode plate are laminated. A tubular shape provided around the laminated body, a plurality of first resin portions holding the edges of the electrode plates of the plurality of bipolar electrodes, and the plurality of first resin portions when viewed from the stacking direction of the laminated body. An apparatus for manufacturing a power storage module for manufacturing a power storage module including a frame including a second resin part, which accommodates an electrode laminate in which a plurality of bipolar electrodes provided with the first resin part are stacked, and has electrodes. It has a cavity in which a void is formed around the electrode laminate when the laminate is accommodated when viewed from the stacking direction, and an injection port for injecting a resin to be a second resin portion from the stacking direction into the cavity. The mold, the injector that injects the resin into the mold through the injection port, and the mold that is located around the electrode laminate and different from the injection port when viewed from the stacking direction, are placed in the void. A sensor unit that detects the flowing resin and a control unit that controls the resin injection of the injector according to the detection of the sensor unit are provided.

In the storage module manufacturing apparatus, when the resin is injected into the mold containing the electrode laminate and the sensor unit detects the resin flowing in the voids around the electrode laminate, the control unit ejects the resin. Controls the resin injection of the vessel. By controlling the injector according to the detection of the resin by the sensor unit in this way, it is possible to appropriately form the second resin unit as designed even if the electrode laminate has individual differences such as tolerances. It is possible to obtain a frame having high shape accuracy.

In the power storage module manufacturing apparatus according to another aspect of the present invention, the sensor unit is arranged at a position where the resins flowing around the electrode laminate meet. In this case, the merging of the resins is detected by detecting the resins by the sensor unit.

The device for manufacturing a power storage module according to another aspect of the present invention includes a pair of sensors whose sensor portions are separated in the circumferential direction of the electrode laminate when viewed from the stacking direction. In this case, the reliability of resin detection by the sensor unit is improved.

In the storage device manufacturing apparatus according to another aspect of the present invention, the electrode laminate is rectangular when viewed from the stacking direction, and the voids formed around the electrode laminate are rectangular annular when viewed from the stacking direction. The mold has four injection ports at positions corresponding to the four corners of the rectangular annular void, and the mold has four sensor units at positions corresponding to the midpoints of the four sides of the rectangular annular void. Is placed. In this case, the deformation of the electrode laminate due to the resin injection can be suppressed.

In the method for manufacturing a power storage module according to one aspect of the present invention, a plurality of bipolar electrodes including an electrode plate, a positive electrode provided on one surface of the electrode plate, and a negative electrode provided on the other surface of the electrode plate are laminated. A tubular shape provided around the laminated body, a plurality of first resin portions holding the edges of the electrode plates of the plurality of bipolar electrodes, and the plurality of first resin portions when viewed from the stacking direction of the laminated body. It is a method of manufacturing a power storage module for manufacturing a power storage module including a frame including a second resin part, and an electrode laminate in which a plurality of bipolar electrodes provided with the first resin part are stacked is placed in a cavity of a mold. The step of accommodating and forming a gap around the electrode laminate when viewed from the stacking direction and the resin which should be the second resin portion from the stacking direction are transferred from the injector via the injection port provided in the mold. The process of injecting into the voids of the cavity, the process of detecting the resin flowing in the voids with a sensor placed on the mold at a location different from the injection port around the electrode laminate when viewed from the stacking direction, and the sensor. The control unit includes a step of controlling the resin injection of the ejector according to the detection of the above.

In the method for manufacturing the power storage module, when the resin is injected into the mold containing the electrode laminate and the sensor unit detects the resin flowing in the voids around the electrode laminate, the control unit ejects the resin. Controls the resin injection of the vessel. By controlling the injector according to the detection of the resin by the sensor unit in this way, it is possible to appropriately form the second resin unit as designed even if the electrode laminate has individual differences such as tolerances. It is possible to obtain a frame having high shape accuracy.

According to the present invention, there is provided an apparatus and a method for manufacturing a power storage module in which the shape accuracy of the frame of the power storage module is improved.

It is schematic cross-sectional view which shows one Embodiment of the power storage device including the power storage module. It is schematic cross-sectional view which shows the power storage module which comprises the power storage device of FIG. It is a top view which shows the power storage module which comprises the power storage device of FIG. It is a schematic perspective view which shows the manufacturing apparatus which manufactures the power storage module of FIGS. It is a top view which showed the mold of the manufacturing apparatus of FIG. It is a flowchart which showed the procedure of manufacturing the power storage module of FIGS. It is a top view which showed the mold of a different aspect. It is a top view which showed the mold of a different aspect.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same reference numerals are used for the same or equivalent elements, and duplicate description is omitted. The drawing shows the XYZ Cartesian coordinate system.

[Configuration of power storage device]
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 secondary battery or a lithium ion secondary battery, but may be an electric double layer capacitor. In the following description, a nickel hydrogen secondary battery will be illustrated.

The plurality of power storage modules 12 can 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 outside 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 positive electrode terminal 24 is connected to the conductive plate 14 located at one end, and the negative electrode terminal 26 is connected to the conductive plate 14 located at the other end. The positive electrode terminal 24 may be integrated with the conductive plate 14 to be connected. The negative electrode terminal 26 may be integrated with the conductive plate 14 to be connected. The positive electrode terminal 24 and the negative electrode terminal 26 extend in a direction (X direction) intersecting the stacking direction D1. The positive electrode terminal 24 and the negative electrode terminal 26 can be used to charge and discharge the power storage device 10.

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 released 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 connecting members (bolts 18 and nuts 20) that connect 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 negative electrode terminal 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 positive electrode terminal 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.

2 and 3 show a schematic cross-sectional view and a plan view of the power storage module constituting the power storage device of FIG. 1, respectively. The power storage module 12 shown in FIGS. 2 and 3 includes a laminated body 30 in which a plurality of bipolar electrodes (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, a positive electrode 36 provided on one surface of the electrode plate 34, and a negative electrode 38 provided on the other surface of the electrode plate 34. In the laminated body 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. Is opposed to 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) having a negative electrode 38 arranged on the 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 one surface (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. .. 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 first resin portion 52 has a thin film-like shape formed relatively thinly. The adjacent first resin portions 52 are in contact with each other on a surface extending outside the other surface (the surface on which the negative electrode 38 is formed) of the electrode plate 34 of each bipolar electrode 32. As a result, the edge portion 34a of the electrode plate 34 of each bipolar electrode 32 is buried and held in the first resin portion 52. Similar to the edge 34a of the electrode plate 34 of each bipolar electrode 32, the edge 34a of the electrode plates 34 arranged at both ends of the laminated body 30 is also held in a state of being embedded in the first resin portion 52. As a result, an internal space V airtightly partitioned by the electrode plates 34, 34 and the first resin portion 52 is formed between the electrode plates 34, 34 adjacent to the stacking direction D1. An electrolytic solution (not shown) composed of an alkaline solution such as an aqueous potassium hydroxide solution is housed in the internal space V. In the following description, the laminate 30 in which the first resin portion 52 is provided on each bipolar electrode 32 is also referred to as an electrode laminate 60.

The second resin portion 54 constituting the outer wall of the frame body 50 is a tubular portion extending in the axial direction in the stacking direction D1. 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 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 electrode plate 34 is a rectangular metal foil made of, for example, nickel. 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 other surface of the electrode plate 34 is slightly larger than the formation region of the positive electrode 36 on one surface of the electrode plate 34.

The separator 40 is formed in a sheet shape, for example. 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 fabric 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. The separator 40 is not limited to a sheet shape, and a bag shape may be used.

The frame body 50 (first resin portion 52 and second resin portion 54) is formed in a rectangular tubular shape by, for example, injection molding using an insulating resin. Examples of the resin material constituting the frame 50 include polypropylene (PP), polyphenylene sulfide (PPS), modified polyphenylene ether (modified PPE), and the like. In the present embodiment, the first resin portion 52 and the second resin portion 54 are made of the same resin material. By using the same resin material for the first resin portion 52 and the second resin portion 54, the bonding between them becomes stronger. Further, since the coefficient of thermal expansion of the first resin portion 52 and the coefficient of thermal expansion of the second resin portion 54 are equal to each other, it is possible to prevent the joint portion from coming off even when the temperature rises.

FIG. 4 is a schematic perspective view showing a manufacturing apparatus for manufacturing the above-mentioned power storage module 12.

Specifically, the manufacturing apparatus 100 shown in FIG. 4 is a vertical injection molding machine that forms the second resin portion 54 of the frame body 50 by insert molding, and includes a mold 130 including a lower mold 110 and an upper mold 120. , An injector 140 that injects the resin 54a into the mold 130, and a controller 150 that controls the injector 140 are provided.

The lower die 110 extends horizontally and has a rectangular cavity 112 recessed in the vertical direction. The size of the cavity 112 is, for example, 160 mm × 160 mm × 14 mm (depth). Inside the cavity 112, the electrode laminate 60 is arranged as an insert. At this time, the electrode laminate 60 is arranged so that its stacking direction (that is, the stacking direction of the laminate 30) is substantially parallel to the vertical direction. The dimensions of the electrode laminate 60 are, for example, 150 mm × 150 mm × 10 mm (height). The cavity 112 is designed so that when the electrode laminate 60 is arranged, a rectangular annular void G having a uniform width (for example, a width of 5 mm) is formed around the electrode laminate 60. Further, the depth of the cavity 112 is only a predetermined length from the height of the electrode laminate 60 so that the peripheral edge portion of the electrode laminate 60 is covered from the lamination direction D1 by the second resin portion 54 as shown in FIG. It is deeply designed. Further, four sensor units 114 are provided on the bottom surface of the cavity 112 of the lower mold 110 in a region corresponding to the rectangular annular gap G. In the present embodiment, each sensor unit 114 is composed of one sensor. The sensor used in the sensor unit 114 is a sensor that detects the arrival of the resin 54a flowing in the gap G, and in the present embodiment, an infrared detection type flow front sensor is adopted.

The upper die 120 extends in the horizontal direction so as to face the lower die 110, and when superposed on the lower die 110, covers the cavity 112 of the lower die 110. The facing surface 120a of the upper mold 120 facing the lower mold 110 is provided with four gates (injection ports) 122 for injecting the resin 54a ejected from the injector 140 into the cavity 112.

The injector 140 injects the resin 54a, which should be the second resin portion 54 of the frame body 50, into the mold 130. The resin 54a ejected from the nozzle of the injector 140 is sent to the gate 122 of the upper mold 120 through a runner (not shown). The head portion 142 of the injector 140 is a portion that advances and retreats along the vertical direction by, for example, a screw or a plunger. By moving the head portion 142, the injection amount and injection pressure of the resin 54a injected from the injector 140 can be adjusted.

The controller (control unit) 150 is a part that controls the injector 140. In particular, the controller 150 controls the movement of the head portion 142 of the injector 140 and performs VP switching. That is, the controller 150 switches the injection of the injector 140 from the speed priority control (primary pressure) to the supplementary pressure control (secondary pressure) at a predetermined timing. The controller 150 is configured so that the detection result of the sensor unit 114 provided on the lower mold 110 is fed back and input.

Here, the positional relationship between the four sensor units 114 provided on the lower mold 110 and the gate 122 provided on the upper mold 120 will be described with reference to FIG.

As shown in FIG. 5, in the present embodiment, when the electrode laminate 60 is arranged in the cavity 112, a rectangular annular void G is formed around the electrode laminate 60 when viewed from the stacking direction. More specifically, the shape of the gap G is a square ring, and the lengths of the portions corresponding to the four sides of the gap G are equal. The four sensor units 114 provided on the lower mold 110 are arranged at positions corresponding to the midpoints of the four sides of the gap G, respectively. Further, the four gates 122 provided in the upper mold 120 are arranged at positions corresponding to the four corners of the gap G, respectively. The resin 54a injected into the gap G from each gate 122 flows along the sides in the gap G starting from each of the four corners of the gap G. In the present embodiment, the opening size of each gate 122 is the same, the amount of resin injected from each gate 122 per unit time is the same, and the resin is downward from each gate 122 along the vertical direction. Since 54a is injected into the gap G, as shown in FIG. 5, the resins injected from the adjacent gates 122 along each side merge at the midpoint of the side. In other words, the sensor unit 114 is arranged at a position where the resins flowing through the gap G meet.

Since the sensor unit 114 is a sensor that detects the arrival of the resin 54a, by arranging the sensor unit 114 at the above position, it is possible to detect the timing at which the resins flowing through the gap G merge (or the timing immediately before the merge).

Subsequently, a procedure for manufacturing the power storage module 12 using the manufacturing apparatus shown in FIG. 4 will be described with reference to FIG.

When manufacturing the power storage module 12, first, the electrode laminate 60 is arranged in the cavity 112 of the lower mold 110, and the upper mold 120 is superposed on the lower mold 110 along a predetermined guide pin to form an electrode. The laminated body 60 is arranged in the mold 130. (Step S1 in FIG. 6)
Next, the injection of the resin 54a, which should be the second resin portion, is started. Specifically, the injector 140 is controlled by the controller 150 to inject the resin 54a into the cavity 112 from each gate 122 of the upper mold 120. At this point, the controller 150 controls the injection of the injector 140 with a velocity-priority primary pressure. (Step S2 in FIG. 6)
Then, when the resin 54a flowing into the gap G from the gate 122 flows along each side of the gap G and the resin 54a reaches the sensor unit 114, the arrival of the resin 54a is detected by the sensor unit 114. (Step S3 in FIG. 6)
Then, the detection result of the sensor unit 114 is input to the controller 150, and the controller 150 controls the injector 140 accordingly. (Step S4 in FIG. 6) More specifically, when the detection result is input from the sensor unit 114, the controller 150 holds the injection of the injector 140 (that is, the resin injection into the mold 130) from the speed priority control. Switch to control.

The timing of switching the injector 140 to the holding pressure control (VP switching) significantly affects the shape accuracy of the second resin portion 54 of the frame body 50. For example, when the timing of switching to the pressure holding control by the controller 150 is early, the resin 54a is not sufficiently filled in the gap G around the electrode laminate 60, and as a result, the resin 54a corresponds to the vicinity of the confluence. 2 The thickness of the resin portion 54 becomes thin. As a result, it becomes difficult to secure sufficient airtightness and strength in the second resin portion 54. On the other hand, when the timing of switching to the pressure holding control by the controller 150 is late, the resin 54a filled in the void G around the electrode laminate 60 presses the first resin portion 52 of the electrode laminate 60 at a relatively high pressure. As a result, the outer shape of the electrode laminate 60 is significantly deformed. In particular, since the first resin portion 52 in the present embodiment is thin and soft, it is easily deformed.

That is, if the switching of the injector 140 to the holding pressure control is at an appropriate timing, the deformation of the frame body 50 can be suppressed, and the shape accuracy of the frame body 50 can be improved. However, individual differences such as tolerances are likely to occur in the electrode laminated body 60, and in particular, dimensional tolerances and stacking deviations of the first resin portion 52 are likely to occur. Therefore, switching timing to appropriate pressure holding control for each electrode laminated body 60 Can be different.

Therefore, in the above-described embodiment, the resin 54a is injected into the mold 130 in which the electrode laminate 60 is housed, and the sensor unit 114 detects the resin 54a flowing in the gap G around the electrode laminate 60. Occasionally, the controller 150 controls the VP switching of the injector 140. By controlling the injector 140 in response to the detection of the resin 54a by the sensor unit 114 in this way, the frame body 50 having high shape accuracy can be obtained.

The sensor unit 114 does not necessarily have to be arranged at the merging point where the resins merge, and may be arranged at a merging point away from the merging point to detect the merging timing of the resins. For example, by arranging the sensor unit 114 at a position slightly offset from the merging point on the upstream side of the resin 54a, it is possible to detect the timing before the resins merge (for example, the timing immediately before merging), and the injection can be performed. Depending on the conditions, it may be preferable to switch the injector 140 to the holding pressure control at that timing.

In addition to the flow front sensor, a pressure sensor or a temperature sensor can also be used for the sensor unit 114. For example, in a pressure sensor, the pressure is zero before the arrival of the resin, and the pressure increases when the resin arrives. Therefore, the arrival of the resin can be detected based on a predetermined threshold value or a rate of change. Further, since the detection temperature of the temperature sensor rises when a high temperature resin (for example, 250 ° C.) arrives, the arrival of the resin can be detected based on a predetermined threshold value or a rate of change.

Further, it is not always necessary to provide a plurality of sensor units 114, and at least one sensor unit 114 may be provided. When a plurality of sensor units 114 are provided and the detection timings of the sensor units 114 are different, the detection timing of the sensor unit 114 detected earliest may be used, or the sensor unit detected earliest may be used. The detection timing of the second and subsequent predetermined sensor units 114 other than 114 may be used.

Further, the sensor unit 114 can be appropriately changed to a sensor unit 114A having a pair of sensors 115 and 116 as shown in FIG. 7. The pair of sensors 115 and 116 are separated from each other in the circumferential direction (that is, the direction along each side) of the electrode laminate 60 when viewed from the stacking direction, and are arranged so as to sandwich the confluence portion of the resins. In this case, the arrival of the resin 54a is detected by each of the pair of sensors 115 and 116. According to the sensor unit 114A, the controller 150 can switch to the pressure holding control of the injector 140 according to the detection timing of either of the sensors 115 and 116. For example, the detection timings of the sensors 115 and 116 that have detected the arrival of the resin 54a earlier are input to the controller 150. Further, according to the sensor unit 114A, when the detection timings of both the sensors 115 and 116 are separated by a predetermined time or more, it is possible to detect a defect (a defect of resin injection, a malfunction of the sensor unit itself, etc.). Therefore, according to the sensor unit 114A, the reliability of resin injection can be improved.

The sensor portions 114 and 114A do not necessarily have to be provided on the bottom surface of the cavity 112 of the lower mold 110, and may be provided on the side surface of the cavity 112 or on the upper mold 120.

Not only the position of the sensor unit 114 but also the position of the gate 122 of the upper die 120 can be changed as appropriate.

As shown in FIG. 8, when the electrode laminated body 60B is rectangular when viewed from the stacking direction, and the void G formed around the electrode laminated body 60B is rectangular and annular when viewed from the stacking direction. The gate 122B may be arranged at a position shifted from the four corners of the gap to the long side side. In this case, by making the separation length (distance) along the gap G between the adjacent gates 122B the same, the resin 54a joins at each midpoint of the four sides of the gap G, so that the resin 54a joins each of the four sides of the gap G. Four sensor units 114 may be arranged at positions corresponding to the points.

Further, in the above-described embodiment or modified example, the power storage device 10 has been described with reference to an example of a nickel-metal hydride secondary battery, but the power storage device 10 may be a lithium ion secondary battery. In this case, the positive electrode active material is, for example, a composite oxide, metallic lithium, sulfur or the like. The negative electrode active material includes, for example, graphite, highly oriented graphite, mesocarbon microbeads, carbon such as hard carbon and soft carbon, alkali metals such as lithium and sodium, metal compounds, SiOx (0.5 ≦ x ≦ 1.5). Metal oxides such as, boron-added carbon, and the like.

12 ... Power storage module, 30 ... Laminate, 32 ... Bipolar electrode, 34 ... Electrode plate, 34a ... Edge, 36 ... Positive electrode, 38 ... Negative, 50 ... Frame, 52 ... First resin part, 54 ... Second resin Part, 54a ... Resin, 60, 60B ... Electrode laminate, 100 ... Manufacturing equipment, 110, 110A ... Upper mold, 112 ... Cavity, 114, 114A ... Sensor part, 120 ... Lower mold, 122, 122B ... Gate, 130, 130A, 130B ... mold, 140 ... injector, 150 ... controller, G ... void, V ... internal space.

Claims (6)

A laminate in which a plurality of bipolar electrodes including an electrode plate, a positive electrode provided on one surface of the electrode plate, and a negative electrode provided on the other surface of the electrode plate are laminated.
A plurality of first resin portions holding the edges of the respective electrode plates of the plurality of bipolar electrodes, and a tubular second resin portion provided around the plurality of first resin portions when viewed from the stacking direction of the laminate. A device for manufacturing a power storage module that manufactures a power storage module including a frame including a resin portion.
An electrode laminate in which a plurality of the bipolar electrodes provided with the first resin portion are stacked is accommodated, and when the electrode laminate is accommodated, voids are formed around the electrode laminate when viewed from the stacking direction. a cavity formed, the mold having an inlet for injecting a pre-Symbol resin to the second resin portion to the gap of the cavity,
An injection device that injects the resin into the mold through the injection port, and
A sensor unit that is arranged in the mold at a position different from the injection port around the electrode laminate when viewed from the stacking direction and detects the arrival of the resin flowing in the voids.
A power storage module manufacturing apparatus including a control unit that controls resin injection of the injector and starts holding pressure control of resin injection of the injector according to the timing when the sensor unit detects the arrival of the resin. .. The device for manufacturing a power storage module according to claim 1, wherein the sensor unit is arranged at a position where the resins flowing around the electrode laminate meet. A plurality of the sensor units are provided.
The mold has a plurality of injection ports, and the sensor unit is arranged at least at least a part of a plurality of locations where the resins flowing around the electrode laminate meet.
The apparatus for manufacturing a power storage module according to claim 1 or 2, wherein the plurality of injection ports are spaced apart at equal intervals with respect to the circumferential direction of the electrode laminate when viewed from the stacking direction. The electrode laminate is rectangular when viewed from the stacking direction, and the voids formed around the electrode laminate are rectangular annular when viewed from the stacking direction .
The device for manufacturing a power storage module according to any one of claims 1 to 3, wherein four sensor units are arranged on each of the four sides of the rectangular annular gap in the mold. The device for manufacturing a power storage module according to claim 1 , wherein the sensor unit is composed of a pair of sensors separated in the circumferential direction of the electrode laminate when viewed from the stacking direction. A laminate in which a plurality of bipolar electrodes including an electrode plate, a positive electrode provided on one surface of the electrode plate, and a negative electrode provided on the other surface of the electrode plate are laminated.
A plurality of first resin portions holding the edges of the respective electrode plates of the plurality of bipolar electrodes, and a tubular second resin portion provided around the plurality of first resin portions when viewed from the stacking direction of the laminate. A method for manufacturing a power storage module for manufacturing a power storage module including a frame including a resin portion.
A step of accommodating an electrode laminate in which a plurality of the bipolar electrodes provided with the first resin portion are stacked in a cavity of a mold to form a void around the electrode laminate when viewed from the stacking direction.
The resin to be the pre-Symbol second resin part, through the inlet provided in the mold, a step of injecting from the injector to the resin injection is controlled by the gap of the cavity by the control unit,
A step of detecting the arrival of the resin flowing in the void with a sensor arranged in the mold at a position different from the injection port around the electrode laminate when viewed from the stacking direction.
Depending on the timing at which the sensor detects the arrival of the resin, wherein the control unit includes a step of starting the control holding pressure of the resin injected in the injection device, a manufacturing method of the power storage module.

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