JP2019009078A - Manufacturing method of power storage device and power storage device - Google Patents

Abstract

To restrain occurrence of wrinkles and warpage of an electrode plate.SOLUTION: A manufacturing method of power storage device 1 includes a primary molding step of forming a first portion 21 of a sealing body 12 on the marginal part 15c of an electrode plate 15, a lamination step of forming an electrode laminate 11 by laminating bipolar electrodes 14 so that the first portion 21 is placed between the marginal parts 15c, and a secondary molding step of forming a second portion 22 surrounding the first portion 21 from the outside along the lateral face 11a of the electrode laminate 11, out of the sealing body 12. In the primary molding step, a first resin member 43 is fused and frozen while superposing the first resin member 43 and a nonwoven fabric 42, which has never been heated to reach the fusion temperature of the first resin member 43 in the past, in this order on the marginal parts 15c of the electrode plate 15 thus forming the first portion 21, including the resin part 31 coupled to the marginal parts 15c of the electrode plate 15 and a nonwoven fabric 32 coupled to the resin part 31, on the marginal parts 15c of the electrode plate 15.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a method for manufacturing a power storage device and a power storage device.

  As a conventional power storage device, a bipolar battery including a bipolar electrode in which a positive electrode is formed on one surface of an electrode plate and a negative electrode is formed on the other surface is known (see Patent Document 1). The bipolar battery is provided with a laminate formed by laminating a plurality of bipolar electrodes via a separator. The laminated body is provided with a sealing body made of a resin, and the edge of the electrode plate is held on the side surface formed by the lamination of the bipolar electrodes.

JP 2011-204386 A

  As a method for manufacturing the power storage device as described above, for example, a part of the sealing body is formed in advance on the edge of each electrode plate, and the part is positioned between the edges of the electrode plates. A method of forming the remaining part of the sealing body so as to surround the part from the outside after the bipolar electrode is laminated on the substrate is conceivable. However, in such a case, when a part of the sealing body is welded to the edge of the electrode plate, the electrode plate is wrinkled or warped due to a difference in thermal expansion coefficient between the part and the electrode plate. There are concerns about the occurrence. The wrinkles and warpage of the electrode plates may induce a short circuit between adjacent electrode plates.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a method for manufacturing a power storage device and a power storage device that can suppress wrinkles and warpage of an electrode plate.

  A method for manufacturing a power storage device according to one aspect of the present invention includes a bipolar electrode laminate including an electrode plate having a positive electrode formed on one side and a negative electrode formed on the other side, and an edge of the bipolar electrode. And a sealing body provided on the side surface of the laminate, and a first forming step of forming a first portion of the sealing body on the edge of the electrode plate, Laminating the bipolar electrode so that one part is disposed between the edges of the electrode plates, thereby forming a laminated body, and the first part along the side surface of the laminated body of the sealing body A second molding step for forming a second portion surrounding the outer side of the first resin member. In the primary molding step, the first resin member and the heating up to the melting temperature of the first resin member have been performed in the past. In the state where the non-woven fabric is laminated on the edge of the electrode plate in this order, the first tree By melting and solidifying the member, and a resin portion which is coupled to the edge of the electrode plate is formed on the first portion of the electrode plate edge on which includes a nonwoven fabric portion joined to the resin portion.

  In this power storage device manufacturing method, in the primary molding step, the first resin member and the non-woven fabric are stacked on the edge of the electrode plate in this order, and the first resin member is melted and solidified. A first portion including a nonwoven fabric portion is formed on the edge of the electrode plate. Thereby, since the thermal expansion coefficient of a nonwoven fabric is smaller than the thermal expansion coefficient of a resin part, compared with the case where the whole 1st part consists of resin, the thermal expansion coefficient of a 1st part can be reduced, and a 1st part and an electrode plate The difference in the thermal expansion coefficient can be reduced. In particular, in this method for manufacturing a power storage device, in the primary molding step, a nonwoven fabric that has never been heated up to the melting temperature of the first resin member in the past is used. Thereby, since the thermal expansion coefficient of a nonwoven fabric becomes the smallest at the time of the first heating, the thermal expansion coefficient of a 1st part can be reduced effectively, and the difference of the thermal expansion coefficient between a 1st part and an electrode plate is effective. Can be reduced. Therefore, according to the method for manufacturing the power storage device, generation of wrinkles and warpage of the electrode plate can be suppressed.

  In the primary molding step, the first resin member and the second resin member may be melted and solidified in a state where the second resin member is further stacked on the nonwoven fabric. In this case, wrinkles and warpage of the electrode plate can be further suppressed.

  In the primary molding step, the first resin member and the second resin member are melted and solidified in a state where the entire surface of the nonwoven fabric on the second resin member side is covered with the second resin member, so that the nonwoven fabric is formed in the resin portion. The first portion where the portion is disposed may be formed on the edge of the electrode plate. In this case, generation | occurrence | production of the wrinkles and curvature of an electrode plate can be suppressed further.

  Moreover, you may form the 1st part by which a nonwoven fabric part is arrange | positioned on the resin part on the edge part of an electrode plate at a primary shaping | molding process. In this case, wrinkles and warpage of the electrode plate can be further suppressed.

  In the primary molding step, a first portion in which the outer edges of the resin portion and the nonwoven fabric portion coincide with each other when viewed from the direction perpendicular to the electrode plate may be formed on the edge portion of the electrode plate. In this case, the second part can be formed well along the side surface of the laminate in the secondary molding step, and the sealing performance by the second part can be improved.

  A power storage device according to one aspect of the present invention is a power storage device having a bipolar electrode made of an electrode plate having a positive electrode formed on one side and a negative electrode formed on the other side, wherein the bipolar electrode is connected via a separator. A laminated body formed by stacking and a sealing body provided on a side surface of the laminated body so as to surround the edge of the bipolar electrode, and the sealing body is disposed at least between the edges of the electrode plate And a second portion surrounding the first portion from the outside along the side surface, the first portion being coupled to the edge portion of the electrode plate and the resin portion The nonwoven fabric portion has a thermal history in which heating up to the melting temperature of the resin portion is performed only once.

  In this power storage device, in the sealing body, the first portion disposed between the edges of the electrode plates is a nonwoven fabric bonded to the resin portion in addition to the resin portion bonded to the edge portion of the electrode plate. Contains parts. Thereby, since the thermal expansion coefficient of a nonwoven fabric is smaller than the thermal expansion coefficient of a resin part, compared with the case where the whole 1st part consists of resin, the thermal expansion coefficient of a 1st part can be reduced, and a 1st part and an electrode plate The difference in the thermal expansion coefficient can be reduced. In particular, in this power storage device, the nonwoven fabric portion has a heat history that is heated only once until the melting temperature of the resin portion is reached. Thereby, since the thermal expansion coefficient of a nonwoven fabric becomes the smallest at the time of the first heating, the thermal expansion coefficient of a 1st part can be reduced effectively, and the difference of the thermal expansion coefficient between a 1st part and an electrode plate is effective. Can be reduced. Therefore, according to this power storage device, wrinkles and warpage of the electrode plate can be suppressed.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method and electrical storage apparatus of an electrical storage apparatus which can suppress generation | occurrence | production of the wrinkles and curvature of an electrode plate can be provided.

It is a schematic sectional drawing which shows one Embodiment of an electrical storage apparatus. It is a schematic sectional drawing which shows the internal structure of the electrical storage module of FIG. It is a schematic sectional drawing which expands and shows a part of FIG. (A) And (b) is a schematic sectional drawing which shows the manufacturing method of the electrical storage apparatus of FIG. It is a graph which shows an example of the change of the amount of elongation of the nonwoven fabric by the number of times of heating. It is a schematic sectional drawing which shows a 1st modification. It is a schematic sectional drawing of a part.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In the following description, the same reference numerals are used for the same or corresponding elements, and duplicate descriptions are omitted.

  FIG. 1 is a schematic cross-sectional view showing an embodiment of a power storage device. The power storage device 1 shown in FIG. 1 is used as a battery for various vehicles such as forklifts, hybrid vehicles, and electric vehicles. The power storage device 1 includes a power storage module stack 2 formed by stacking a plurality of power storage modules 4 and a restraining member 3 that applies a restraining load to the power storage module stack 2 in the stacking direction.

  The power storage module laminate 2 includes a plurality (three in the present embodiment) of power storage modules 4 and a plurality of conductive plates 5 arranged between the power storage modules 4 and 4. The power storage module 4 is, for example, a bipolar battery including a bipolar electrode 14 described later, and has a rectangular shape when viewed from the stacking direction. The power storage module 4 is, for example, a secondary battery such as a nickel metal hydride secondary battery or a lithium ion secondary battery, or an electric double layer capacitor. In the following description, a nickel metal hydride secondary battery is illustrated.

  The power storage modules 4 and 4 adjacent to each other in the stacking direction are electrically connected through the conductive plate 5. The conductive plates 5 are also arranged outside the power storage modules 4 located at the end of the stack. A positive electrode terminal 6 is connected to one conductive plate 5 disposed outside the power storage module 4 located at the end of the stack. A negative electrode terminal 7 is connected to the other conductive plate 5 disposed outside the power storage module 4 located at the stacking end. The positive electrode terminal 6 and the negative electrode terminal 7 are drawn out, for example, from the edge of the conductive plate 5 in a direction crossing the stacking direction. The power storage device 1 is charged and discharged by the positive electrode terminal 6 and the negative electrode terminal 7.

  Inside each conductive plate 5, a plurality of flow paths 5a for circulating a refrigerant such as air are provided. Each flow path 5a extends in parallel to each other in a direction orthogonal to, for example, the stacking direction and the drawing direction of the positive electrode terminal 6 and the negative electrode terminal 7. By causing the refrigerant to flow through these flow paths 5a, the conductive plate 5 functions as a connecting member that electrically connects the power storage modules 4 and 4 and also dissipates heat generated in the power storage module 4. It also has the function as In the example of FIG. 1, the area of the conductive plate 5 viewed from the stacking direction is smaller than the area of the power storage module 4, but from the viewpoint of improving heat dissipation, the area of the conductive plate 5 is the area of the power storage module 4. It may be the same as or larger than the area of the power storage module 4.

  The restraining member 3 includes a pair of end plates 8 and 8 that sandwich the power storage module stack 2 in the stacking direction, and a fastening bolt 9 and a nut 10 that fasten the end plates 8 and 8 together. The end plate 8 is a rectangular metal plate having an area that is slightly larger than the areas of the power storage module 4 and the conductive plate 5 as viewed from the stacking direction. On the inner side surface of the end plate 8 (the surface on the power storage module laminate 2 side), an electrically insulating film F is provided. The film F insulates the end plate 8 from the conductive plate 5.

  An insertion hole 8 a is provided at the edge of the end plate 8 at a position that is outside the power storage module stack 2. The fastening bolt 9 is passed from the insertion hole 8 a of one end plate 8 toward the insertion hole 8 a of the other end plate 8, and at the tip of the fastening bolt 9 protruding from the insertion hole 8 a of the other end plate 8. The nut 10 is screwed together. As a result, the power storage module 4 and the conductive plate 5 are sandwiched between the end plates 8 and 8 and unitized as the power storage module stack 2, and a restraining load is applied to the power storage module stack 2 in the stacking direction.

  Next, the configuration of the power storage module 4 will be described in more detail. FIG. 2 is a schematic cross-sectional view showing the internal configuration of the power storage module 4. As shown in FIG. 1, the power storage module 4 includes an electrode stack 11 and a sealing body 12 that seals the electrode stack 11.

  The electrode laminate 11 is configured by laminating a plurality of bipolar electrodes 14 via separators 13. The bipolar electrode 14 is an electrode composed of an electrode plate 15 having a positive electrode 16 formed on one side 15a and a negative electrode 17 formed on the other side 15b. In the electrode stack 11, the positive electrode 16 of one bipolar electrode 14 faces the negative electrode 17 of one bipolar electrode 14 adjacent in the stacking direction with the separator 13 interposed therebetween. In the electrode stack 11, the negative electrode 17 of one bipolar electrode 14 faces the positive electrode 16 of the other bipolar electrode 14 adjacent in the stacking direction with the separator 13 interposed therebetween.

  A negative electrode termination electrode 18 is disposed on one of the laminated ends of the electrode laminate 11, and a positive electrode termination electrode 19 is disposed on the other laminated end of the electrode laminate 11. The negative electrode termination electrode 18 is an electrode plate 15 having a negative electrode 17 formed on the inner surface (the surface on the center side in the stacking direction), and the positive electrode termination electrode 19 is the positive electrode 16 on the inner surface (the surface on the center side in the stacking direction). The electrode plate 15 is formed. The negative electrode 17 of the negative electrode termination electrode 18 faces the positive electrode 16 of the bipolar electrode 14 at one end of the stack via the separator 13. The positive electrode 16 of the positive electrode termination electrode 19 is opposed to the negative electrode 17 of the other bipolar electrode 14 at the stacked end with the separator 13 interposed therebetween. The electrode plate 15 of the negative electrode termination electrode 18 and the electrode plate 15 of the positive electrode termination electrode 19 are electrically connected to the conductive plate 5 (see FIG. 1) adjacent to the power storage module 4.

  The electrode plate 15 is a rectangular metal foil made of nickel, for example. An edge portion (edge portion of the bipolar electrode 14) 15c of the electrode plate 15 is an uncoated region where the positive electrode active material and the negative electrode active material are not applied. An example of the positive electrode active material constituting the positive electrode 16 is nickel hydroxide. As a negative electrode active material which comprises the negative electrode 17, a hydrogen storage alloy is mentioned, for example. In the present embodiment, the formation region of the negative electrode 17 on the other surface 15 b of the electrode plate 15 is slightly larger than the formation region of the positive electrode 16 on the one surface 15 a of the electrode plate 15.

  The separator 13 is formed in a sheet shape, for example. Examples of the material constituting the separator 13 include porous films made of polyolefin resins such as polyethylene (PE) and polypropylene (PP), woven fabrics and nonwoven fabrics made of polypropylene, polyethylene terephthalate (PET), methylcellulose, and the like. . The separator 13 may be reinforced with a vinylidene fluoride resin compound. The separator 13 is not limited to a sheet shape, and may be a bag shape.

  The sealing body 12 is formed, for example, in the shape of a rectangular cylinder, and is configured to surround the side surface 11 a of the electrode stack 11 formed by stacking the bipolar electrodes 14. The sealing body 12 includes a first portion 21 provided along the edge portion 15c of the electrode plate 15 of each bipolar electrode 14, and a second portion provided so as to surround the entire first portion 21 from the outside. 22.

  The first portion 21 is continuously provided over all sides of the electrode plate 15 at the edge portion 15c (uncoated region) on the one surface 15a side of the electrode plate 15. As will be described later, the first portion 21 is coupled to the edge portion 15c by welding. A part of the inside of the first portion 21 is located between the edges 15c of the electrode plates 15 of the bipolar electrodes 14 and 14 adjacent in the stacking direction, and a part of the outside is outward from the electrode plate 15. It is overhanging. The first portion 21 is buried in the second portion 22 in a part of the outside.

  The second portion 22 is formed by, for example, resin injection molding, and extends over the entire length in the stacking direction of the electrode stack 11. The second portion 22 is welded to the outer surface of the first portion 21 by, for example, heat during injection molding, and seals between the bipolar electrodes 14 and 14 adjacent in the stacking direction. Thereby, an internal space V is formed between the bipolar electrodes 14 adjacent to each other in the stacking direction. In the internal space V, an electrolytic solution (not shown) made of an alkaline solution such as an aqueous potassium hydroxide solution is accommodated.

  Subsequently, the configuration of the first portion 21 described above will be described in more detail. FIG. 3 is a schematic sectional view showing a part of FIG. 2 in an enlarged manner. As shown in the figure, the first portion 21 includes a resin portion 31 coupled to the edge portion 15 c of the electrode plate 15 and a nonwoven fabric portion 32 coupled to the resin portion 31. In this example, the resin portion 31 includes a first resin portion 33 and a second resin portion 34 provided so as to sandwich the nonwoven fabric portion 32 therebetween.

  The first resin portion 33, the nonwoven fabric portion 32, and the second resin portion 34 are each formed in a layer shape, and are laminated on the edge portion 15 c of the electrode plate 15 in this order. The first resin portion 33 is welded to the edge portion 15c of the electrode plate 15, and the nonwoven fabric portion 32, the first resin portion 33, and the second resin portion 34 are joined to each other by welding.

  More specifically, the first resin portion 33 is coupled to the edge portion 15c of the electrode plate 15 on the first surface 33a on the electrode plate 15 side, and the nonwoven fabric portion 32 is connected to the electrode plate 15 of the first resin portion 33. Are coupled to the opposite second surface 33b. The second resin portion 34 is coupled to the second surface 33 b of the first resin portion 33 and the surface 32 a of the nonwoven fabric portion 32 opposite to the electrode plate 15. While the width of the nonwoven fabric portion 32 along the direction perpendicular to the stacking direction is narrower than the width of the first resin portion 33, the width of the second resin portion 34 is wider than the width of the nonwoven fabric portion 32. In addition, the entire outer surface of the nonwoven fabric portion 32 is covered with the first resin portion 33 and the second resin portion 34. In the example of FIG. 3, the inner edges and the outer edges of the first resin portion 33 and the second resin portion 34 coincide with each other when viewed from the stacking direction (the direction perpendicular to the electrode plate 15).

  The first resin part 33 and the second resin part 34 of the first part 21 and the second part 22 are insulating resins such as polypropylene (PP), polyphenylene sulfide (PPS), and modified polyphenylene ether (modified PPE). It is comprised by. For example, the second resin portion 34 is made of the same resin material as that of the first resin portion 33, but may be made of a resin material different from that of the first resin portion 33. The second portion 22 is also made of, for example, the same resin material as the first resin portion 33 and the second resin portion 34, but is made of a resin material different from the first resin portion 33 and / or the second resin portion 34. May be.

  The nonwoven fabric part 32 is comprised by the nonwoven fabric by which resin-made fibers are couple | bonded by melt | fusion, adhesion | attachment, entanglement, etc., for example. Although the nonwoven fabric part 32 is comprised by the fiber which consists of polyamide (PA), for example, you may be comprised by the fiber which consists of polyphenylene sulfide (PPS), polyolefin, etc. As will be described later, the nonwoven fabric portion 32 has a thermal history in which heating up to the melting temperature of the resin portion 31 is performed only once.

  Then, the manufacturing method of the electrical storage apparatus 1 mentioned above is demonstrated. The method for manufacturing the power storage device 1 according to the present embodiment includes a primary molding process, a stacking process, and a secondary molding process. In the primary forming step, a predetermined number of bipolar electrodes 14 are prepared, and the first portion 21 is formed along the edge 15 c of the electrode plate 15 in each bipolar electrode 14.

  In the primary molding step, first, as shown in FIG. 4A, the first resin member 43, the nonwoven fabric 42, and the second resin member 44 are stacked on the edge 15c of the electrode plate 15 in this order. And In this state, the entire surface 42 a on the second resin member 44 side of the nonwoven fabric 42 is covered with the second resin member 44. In this state, the electrode plate 15, the nonwoven fabric 42, the first resin member 43, and the second resin member 44 are heated to a predetermined welding temperature by hot pressing in the laminating direction, and the first resin member 43 and the first resin member 43 are heated. 2 The resin member 44 is melted and solidified. Thereby, the nonwoven fabric 42, the 1st resin member 43, and the 2nd resin member 44 become the nonwoven fabric part 32 mentioned above, the 1st resin part 33, and the 2nd resin part 34, respectively, and the nonwoven fabric part 32 is arrange | positioned in the resin part 31. The formed first portion 21 is formed on the edge 15 c of the electrode plate 15.

  Here, the welding temperature is set to a temperature higher than both the melting temperature of the first resin member 43 and the melting temperature of the second resin member 44. This welding temperature is higher than the melting temperature of the resin part 31. The welding temperature is set to about 200 ° C., for example. The melting temperature of the nonwoven fabric 42 is higher than the welding temperature, and the nonwoven fabric 42 does not melt during the primary molding process.

  Further, in the primary molding step, the nonwoven fabric 42 that has not been heated up to the melting temperature of the resin portion 31 in the past is used. That is, in the primary molding step, the nonwoven fabric 42 that has never been heated up to the melting temperature of the resin portion 31 in the past is sandwiched between the first resin member 43 and the second resin member 44, The nonwoven fabric 42, the 1st resin member 43, and the 2nd resin member 44 are heated until it reaches the said welding temperature. As a result, in the power storage device 1, the nonwoven fabric portion 32 has a heat history in which the heating up to the melting temperature of the resin portion 31 is performed only once.

  In the laminating step, as shown in FIG. 4B, by laminating the bipolar electrode 14 via the separator 13 so that the first portion 21 is disposed between the edge portions 15c of the electrode plate 15, The electrode laminate 11 is formed. In the secondary molding step, the electrode stack 11 is placed in an injection mold (not shown), and then the molten resin is injected into the mold to surround the first part 21. 22 is formed. Thereby, the sealing body 12 is formed on the side surface 11a of the electrode laminate 11.

  After the secondary forming step, a step of injecting an electrolytic solution into the internal space V between the bipolar electrodes 14, 14, a step of stacking the power storage module 4 and the conductive plate 5 to form the power storage module laminate 2, and a restraining member The power storage device 1 shown in FIG. 1 is obtained through a process of restraining the power storage module stack 2 by 3 and the like.

  Then, the effect of the manufacturing method of the electrical storage apparatus 1 is demonstrated.

  In the method for manufacturing the power storage device 1, in the primary molding step, the first resin member 43 is melted and solidified in a state where the first resin member 43 and the nonwoven fabric 42 are stacked on the edge 15 c of the electrode plate 15 in this order. Thus, the first portion 21 including the resin portion 31 and the nonwoven fabric portion 32 is formed on the edge portion 15 c of the electrode plate 15. Thereby, since the thermal expansion coefficient of the nonwoven fabric 42 is smaller than the thermal expansion coefficient of the resin part 31, the thermal expansion coefficient of the 1st part 21 can be reduced compared with the case where the whole 1st part 21 consists of resin, 1st The difference in thermal expansion coefficient between the portion 21 and the electrode plate 15 can be reduced.

  In particular, in the method for manufacturing the power storage device 1, the nonwoven fabric 42 that has never been heated up to the melting temperature of the resin portion 31 in the past is used in the primary molding step. Thereby, since the thermal expansion coefficient of the nonwoven fabric 42 becomes the smallest during the first heating, the thermal expansion coefficient of the first portion 21 can be effectively reduced, and the thermal expansion coefficient between the first portion 21 and the electrode plate 15 can be reduced. The difference can be effectively reduced. Therefore, according to the method for manufacturing power storage device 1, generation of wrinkles and warpage of electrode plate 15 can be suppressed.

  FIG. 5 is a graph showing an example of a change in the amount of elongation of the nonwoven fabric depending on the number of heating times. In the same figure, the measurement result of the length of the nonwoven fabric when the temperature of the polyamide-based nonwoven fabric having a length of 23 mm at 25 ° C. is continuously changed between 25 ° C. and 200 ° C. is shown. . Symbol S1 indicates the amount of elongation when the nonwoven fabric is heated for the first time, and symbol S2 indicates the change in the length of the nonwoven fabric thereafter.

  As shown in FIG. 5, at the time of the first temperature increase, the nonwoven fabric gradually contracts until the shrinkage amount is about 100 μm in the range up to about 125 ° C., and then the shrinkage amount exceeds 125 ° C. It contracts rapidly until it reaches about 530 μm. On the other hand, when the temperature is lowered from that state, the nonwoven fabric expands gently until the shrinkage reaches about 340 μm in the range up to about 125 ° C., and hardly deforms in the range below 125 ° C. During the second and subsequent heating, the length of the nonwoven fabric changes as in the first temperature drop.

  Thus, in the said nonwoven fabric, the shrinkage amount at the time of the first heating is the largest. That is, the thermal expansion coefficient (linear expansion coefficient) during the first heating is the smallest. The reason why the thermal expansion coefficient of the nonwoven fabric is the smallest during the first heating is that the nonwoven fabric before heating has thermal strain, and the thermal strain is released during the first heating. In addition, the thermal expansion coefficient of the nonwoven fabric at the time of the first heating changes with the material of a nonwoven fabric, a manufacturing method, the shape of a fiber, etc.

  In the method for manufacturing the power storage device 1, in the primary molding step, the first resin member 43 and the second resin member 44 are melted and solidified in a state where the second resin member 44 is further stacked on the nonwoven fabric 42. Thereby, generation | occurrence | production of the wrinkles and curvature of the electrode plate 15 can be suppressed further.

  In the method for manufacturing the power storage device 1, the first resin member 43 and the second resin member 44 are covered with the second resin member 44 so as to cover the entire surface 42 a of the nonwoven fabric 42 on the second resin member 44 side in the primary molding step. By melting and solidifying the resin member 44, the first portion 21 in which the nonwoven fabric portion 32 is disposed in the resin portion 31 is formed on the edge portion 15 c of the electrode plate 15. Thereby, generation | occurrence | production of the wrinkles and curvature of the electrode plate 15 can be suppressed further. Furthermore, since the nonwoven fabric part 32 is not exposed from the resin part 31, and it is not necessary to give the nonwoven fabric part 32 the tolerance with respect to electrolyte solution, the freedom degree of material selection can be improved.

  Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment. For example, as in the modification shown in FIG. 6, the resin portion 31 may be configured to include only the first resin portion 33. In this modified example, the outer edges of the resin portion 31 and the nonwoven fabric portion 32 coincide with each other when viewed from the stacking direction. The power storage device 1 of this modification is manufactured by the same process as the method for manufacturing the power storage device 1 of the above embodiment.

  Also by such a modification, the thermal expansion coefficient of the 1st part 21 can be reduced similarly to the said embodiment, and generation | occurrence | production of the wrinkles and curvature of the electrode plate 15 can be suppressed. Moreover, in the manufacturing method of the power storage device 1 according to the modification, in the primary molding step, the first portion 21 in which the nonwoven fabric portion 32 is disposed on the resin portion 31 is formed on the edge portion 15c of the electrode plate 15, so that the electrode Generation of wrinkles and warping of the plate 15 can be further suppressed. Moreover, in the manufacturing method of the power storage device 1 according to the modified example, the first portion 21 in which the outer edges of the resin portion 31 and the nonwoven fabric portion 32 coincide with each other when viewed from the stacking direction is used as the edge portion 15c of the electrode plate 15 in the primary molding step. Since it forms in the top, the 2nd part 22 can be favorably formed along the side surface 11a of the electrode laminated body 11 in a secondary shaping | molding process, and the sealing performance by the 2nd part 22 can be improved.

  Moreover, in the said embodiment, although the 1st part 21 was formed only in the one surface 15a side of the electrode plate 15, the 1st part 21 is formed in both the one surface 15a side and the other surface 15b side. For example, the edge 15 c of the electrode plate 15 may be formed so as to be buried in the first portion 21. Alternatively, the first portion 21 may be formed only on the other surface 15b side. Moreover, in the said embodiment, although one part of the outer side of the 1st part 21 protruded outside from the electrode plate 15, if the 1st part 21 is arrange | positioned at least between the edge parts 15c of the electrode plate 15, it will be. For example, the entire first portion 21 may be disposed between the edges 15 c of the electrode plate 15. Moreover, in the said embodiment, the nonwoven fabric part 32 may be exposed from the resin part 31, and the outer edge of the nonwoven fabric part 32 may be located inside the outer edge of the resin part 31 in the said modification.

DESCRIPTION OF SYMBOLS 1 ... Power storage device, 11 ... Electrode laminated body, 11a ... Side surface, 12 ... Sealed body, 13 ... Separator, 14 ... Bipolar electrode, 15 ... Electrode plate, 15a ... One side, 15b ... Other side, 15c ... Edge, 21 ... 1st part, 22 ... 2nd part, 31 ... Resin part, 32 ... Nonwoven fabric part, 33 ... 1st resin part, 34 ... 2nd resin part, 42 ... Nonwoven fabric, 43 ... 1st resin member, 44 ... 1st 2 resin members.

Claims (6)

A bipolar electrode laminate comprising an electrode plate having a positive electrode formed on one side and a negative electrode formed on the other side;
And a sealing body provided on a side surface of the multilayer body so as to surround an edge of the bipolar electrode,
A primary forming step of forming a first portion of the sealing body on an edge of the electrode plate;
A lamination step of forming the laminate by laminating the bipolar electrode such that the first portion is disposed between edges of the electrode plate;
A secondary molding step of forming a second portion that surrounds the first portion from the outside along the side surface of the laminated body of the sealing body, and
In the primary molding step, the first resin member and a non-woven fabric that has never been heated up to the melting temperature of the first resin member are stacked in this order on the edge of the electrode plate. The first portion including the resin portion coupled to the edge portion of the electrode plate and the non-woven fabric portion coupled to the resin portion by melting and solidifying the first resin member is attached to the edge of the electrode plate. A method for manufacturing a power storage device formed on a part.   The method for manufacturing a power storage device according to claim 1, wherein in the primary molding step, the first resin member and the second resin member are melted and solidified in a state where the second resin member is further stacked on the nonwoven fabric.   In the primary molding step, the first resin member and the second resin member are melted and solidified with the second resin member covering the entire surface of the nonwoven fabric on the second resin member side. The manufacturing method of the electrical storage apparatus of Claim 2 which forms the said 1st part by which the said nonwoven fabric part is arrange | positioned in the said resin part on the edge part of the said electrode plate.   The method for manufacturing a power storage device according to claim 1, wherein, in the primary molding step, the first portion in which the nonwoven fabric portion is disposed on the resin portion is formed on an edge portion of the electrode plate.   In the primary molding step, the first portion where the outer edges of the resin portion and the nonwoven fabric portion coincide with each other when viewed from a direction perpendicular to the electrode plate is formed on the edge portion of the electrode plate. The manufacturing method of the electrical storage apparatus of description. A power storage device having a bipolar electrode made of an electrode plate having a positive electrode formed on one side and a negative electrode formed on the other side,
A laminate formed by laminating the bipolar electrode via a separator;
A sealing body provided on a side surface of the laminated body so as to surround an edge of the bipolar electrode,
The sealing body has at least a first portion disposed between edges of the electrode plates, and a second portion surrounding the first portion from the outside along the side surface,
The first portion includes a resin portion coupled to an edge portion of the electrode plate, and a nonwoven fabric portion coupled to the resin portion,
The said nonwoven fabric part is an electrical storage apparatus which has the heat history by which the heating to the melting temperature of the said resin part was made only once.

Images