JP2006114406A - Manufacturing method of sheet type battery, sheet type battery, and battery pack cimbined with sheet type unit cell - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To regulate the outer shape of a sheet type battery by a simple constitution. <P>SOLUTION: The sheet type battery is equipped with a sheet material case 12 forming the outer shape by molding a laminated film, a battery power generating element 14 housed in the sheet material case 12, an electrode terminal 16 connected to an electrode body of the battery power generating element 14 and taken out to the outside of the sheet material case 12, and a reinforcing material 30 of the sheet material case 12 formed by resin molding. The reinforcing material 30 is comprised of a frame-shaped frame 32 in the peripheral part of the sheet material case 12, and a plurality of ribs 34 connecting facing sides of the frame 32. The outer dimension accuracy of the sheet type battery containing the reinforcing material 30 is decided by the accuracy of a molding die that resin-molds the ribs 34. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a sheet material type battery manufacturing method and sheet material mold formed by enclosing a battery power generation element with a sheet material, drawing both electrodes from the battery power generation element to the outside, and sealing the end of the sheet material The present invention relates to an assembled battery in which a battery and a sheet material type battery are combined.

  In recent years, with the development of various electronic devices, there has been an increasing need for downsizing and space saving of electronic devices, and the batteries used therefor are also required to be thin and flexible. Therefore, the battery power generation element is hermetically sealed using a sheet-like laminate material. For example, as a sheet-like laminate material, a three-layer structure of a polyethylene layer, an aluminum foil layer, and a polyethylene layer is used. The power generation element is housed inside, the electrode is drawn out, and a lithium ion battery or a nickel metal hydride battery Is formed.

  If these batteries are referred to as sheet material type batteries, the sheet type batteries have a degree of freedom in shape and are suitable for small size and light weight, but since the sheet-like laminate material is used, the rigidity is not so high. The accuracy of the external dimensions of the battery is not so good. In addition, for example, the outer shape of the battery power generation element tends to expand due to an internal reaction. In Patent Document 1, in order to increase the rigidity as a battery pack, a metal reinforcing plate is attached to a pack housing formed using a synthetic resin, and a battery case made of laminate is stored in the housing. Disclosed.

JP 2001-307703 A

  When power is insufficient in one sheet material type battery, a plurality of laminate material type cells are stacked in an aligned arrangement or the like, and an assembled battery is formed using a connection such as series or parallel. For example, when used as a power source for vehicles, several tens of single cells are stacked.

  In such a case, if the outer dimensions of the laminate type unit cell vary, the outer shape of the assembled battery is affected. In one example, when 80 unit cells are arranged and arranged, if the size of each unit cell changes by 0.1 mm, the assembled cell changes by as much as 8 mm. Since the expansion of the outer shape due to the internal reaction of the battery power generation element may be larger than 0.1 mm, the assembled battery may not fit in a predetermined installation place such as a vehicle by simply stacking the cells.

  Although it is conceivable to store the laminate material type cells in the pack housing with the reinforcing plate as in Patent Document 1, the manufacture of the pack housing with the reinforcing plate is complicated and costly. In addition, the entire assembled battery is constrained from the outside by a restraint plate, a restraint band, or the like to suppress the expansion of the outer shape due to the internal reaction of the battery power generation element, but the restraint structure is complicated. Thus, in the prior art, it is difficult to regulate the outer shape of the sheet material type battery.

  The objective of this invention is providing the assembled battery which combines the manufacturing method of the sheet material type battery which can regulate a battery external shape with simple structure, a sheet material type battery, and a sheet material type cell.

  A sheet material type battery manufacturing method according to the present invention wraps a battery power generation element with a sheet material, draws both electrodes from the battery power generation element to the outside, hermetically seals and stores the ends of the sheet material, The step of forming a flat rectangular battery body, and the frame body part that is arranged in the reinforcing material molding die and sandwiches the hermetic sealing end along the periphery of the battery body, and the frame body part face each other A step of resin-molding a reinforcing material composed of a rib portion that connects the sides along the flat surface of the battery body, and press-molding a portion of the flat surface of the battery body that is not resin-molded with the inner wall of the mold. And.

  Further, in the sheet material type battery manufacturing method according to the present invention, the battery body is deformed so that the flat surface expands outward by use of charging / discharging, and both electrodes are pulled out more than along the direction in which both electrodes are pulled out. It is preferable that the deformation along the direction orthogonal to the ribs is large, and the rib portion is arranged along the direction orthogonal to the lead-out direction of both electrodes.

  In the sheet material type battery manufacturing method according to the present invention, the resin used for resin molding is preferably a glass fiber reinforced resin.

  Also, the sheet material type battery according to the present invention is a substantially flat material that encloses the battery power generation element with the sheet material, draws both electrodes from the battery power generation element to the outside, and hermetically seals and stores the ends of the sheet material. Resin molding of a rectangular battery body, a frame body part that sandwiches the hermetic sealing end along the periphery of the battery body, and a rib part that connects opposite sides of the frame body along the flat surface of the battery body And a reinforcing material formed by the method described above.

  In addition, the assembled battery combining the sheet material type cells according to the present invention is an assembled battery in which a plurality of substantially flat rectangular unit cells are arranged and arranged so that the flat surfaces face each other. A battery body having a substantially flat rectangular shape that encloses the power generation element for the battery, draws both electrodes out of the power generation element for the battery, and hermetically seals and stores the ends of the sheet material, and the battery body parallel to the flat surface of the battery body A reinforcing member formed by resin molding integrally with a frame body portion sandwiching the hermetic sealing end along the rectangular periphery of and a rib portion connecting the opposite sides of the frame body portion along the flat surface of the battery body; The overall dimensions are determined by integrating the external dimensions of the reinforcing material whose dimensions are controlled by resin molding.

  With the above configuration, the battery body is placed in the mold, the reinforcing material is resin-molded around the battery body, and the flat surface of the battery body that is not subjected to resin molding is pressed by the inner wall of the mold to be dimensioned. Molded. That is, the outer shape of the battery body is regulated by the inner wall of the mold and the pressure applied during resin molding, and in this state, the frame body portion and the rib portion are integrally molded as a reinforcing material. Accordingly, the expansion of the outer shape of the battery body is effectively suppressed by the integrated reinforcing material, and the external dimensions of the sheet material type battery including the reinforcing material are the same as the external dimensions of the reinforcing material determined by high-precision mold accuracy. Therefore, the battery outer shape can be regulated with a simple configuration.

  Moreover, since the rib portion is disposed along the direction in which the battery body is largely deformed, expansion of the outer shape of the battery body can be more effectively suppressed. Moreover, since resin is glass fiber reinforced resin, the rigidity of a reinforcing material can be improved more.

  In addition, the assembled battery has a plurality of sheet material type cells that are aligned with the outer dimensions of the reinforcing material whose outer dimensions including the reinforcing material are determined with high precision of the mold accuracy, so that the dimensional accuracy of the entire assembled battery can be improved. Can do.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Hereinafter, a lithium ion battery will be described as a sheet material type battery. However, any other battery may be used as long as the battery is formed using a sheet material. For example, a nickel metal hydride battery or a capacitor is used as the battery. There may be. Moreover, although the structure of the battery power generation element is described as a structure in which a separator is sandwiched between two electrode bodies and this is wound in a roll shape, a structure in which these are stacked in a flat plate shape may be used. . Further, as a sheet material, a three-layer laminate sheet material of a plastic film, a metal foil, and a plastic film will be described, but the plastic film layer can be appropriately omitted depending on the configuration of the battery. In addition, the material, thickness, and the like of the sheet material and the adhesive disposed at the joint of the sheet material are examples, and other materials and thicknesses may be used.

  FIG. 1 is a plan view and a side view of a sheet material type battery 10 that hermetically seals a battery power generation element using a sheet-like laminate material. In the plan view, a part is broken, and the internal structure of the sheet material type battery 10 is shown. The sheet material type battery 10 includes a sheet material case 12 which forms a laminate film to form an outer shape of the battery, a battery power generation element 14 housed in the sheet material case 12, and an electrode body of the battery power generation element 14. The electrode terminal 16 is connected and drawn out to the outside of the sheet material case 12, and the reinforcing material 30 of the sheet material case 12 is formed by resin molding. The reinforcing member 30 includes a frame-shaped frame body portion 32 in the peripheral portion of the sheet material case 12 and a plurality of rib portions 34 that connect opposite sides of the frame body portion 32.

  Since the battery power generation element 14 housed in the sheet material case 12 is a functional part of the sheet material type battery 10, this will be described first, and then the hermetic sealing structure of the sheet material case 12 will be described. Next, the configuration of the reinforcing material 30 will be described.

The power generation element 14 for a battery is an element that realizes a power generation structure known as a lithium ion battery. The battery power generation element 14 is overlapped by sandwiching a separator between two electrode bodies coated with an active material, and is formed into a roll shape. It is wound and impregnated with an electrolyte. Of the two electrode bodies, one electrode body has an aluminum foil as a base material, and an active material that is a lithium-containing composite compound such as lithium cobalt oxide is applied to the surface of the electrode body, and the other electrode body has a copper foil as a base material Then, an active material such as a carbon material occluded with lithium ions is applied thereon. As the separator, a polymer electrolyte plasticized with a solvent is used. And by inject | pouring electrolyte solution and making it immerse between one electrode body, a separator, and the other electrode body, it comes to show the function as an electric power generation element of a lithium ion battery. For the electrolytic solution, an organic solvent in which a lithium salt such as LiClO ₄ or LiPF ₆ is dissolved is used. In addition to the method of winding two types of electrode bodies and separators in a roll shape, these may be laminated in the form of a sheet.

  In addition, since the battery power generation element 14 is generally vulnerable to heat, in the subsequent reinforcing material forming step, consideration should be given so that excessive heat such as resin molding is not applied to the battery power generation element 14 portion. preferable. Moreover, the heat resistance of the battery power generation element 14 can be improved by using a heat-resistant separator or the like.

  The electrode terminal 16 is a conductive terminal connected to each of the two electrode bodies of the battery power generation element 14 and has a function of drawing power from the battery power generation element 14 to the outside. Specifically, in the battery power generation element 14, a positive electrode terminal is connected to the aluminum foil of one electrode body by welding or the like, and a negative electrode terminal is connected to copper of the other electrode body by welding or the like. The thickness of the electrode terminal 16 can be about 1 mm, for example.

  Next, the sealing structure of the sheet material case 12 will be described. FIG. 2 is a diagram illustrating a state in which the battery power generation element 14 to which the electrode terminal 16 is connected is housed in the sheet material case 12. FIG. 3 is a diagram showing a cross-sectional structure in the vicinity of the electrode terminal 16 along the line AA in FIG.

  The sheet material case 12 is formed by forming the laminate film 20 into a shape that roughly follows the outer shape of the battery power generation element 14, and specifically has two upper and lower surfaces by folding the material of one laminate film 20. Like the sheet, the upper surface sheet is formed with a concave shape that follows the upper surface shape of the battery power generation element 14, and the lower surface sheet is formed with a concave surface shape that follows the lower surface shape of the battery power generation element 14. Molding is performed so that the peripheral edge of the upper surface sheet and the peripheral edge of the lower surface sheet face each other so that the battery power generation element 14 can be disposed between the pair of concave shapes. Then, an appropriate sealing allowance is taken at the joint, and the outer shape is formed by cutting or the like. In this way, the sheet material case 12 before sealing can be obtained. Of course, it is also possible to form a plurality of sheets made of the laminate film 20 so as to have an appropriate concave shape and sealing allowance, and to combine them into the sheet material case 12.

  That is, the sheet material case 12 has a pair of concave portions facing each other at the center thereof, and has a bulge portion 11 that becomes a pair of convex portions in terms of outer shape, and the upper and lower sheets of the laminate film 20 around the bulge portion 11. Is provided with an outer shape having a flange 13 facing each other. The internal space of the bulge portion 11 is a storage space for the battery power generation element 14, and the flange portion 13 is a portion that adheres the upper surface side sheet and the lower surface side sheet of the laminate film 20 to each other and hermetically seals. It becomes a flat surface. Then, an adhesive 28 for hermetic sealing is disposed on the collar portion 13.

  As shown in FIG. 3, the laminate film 20 is obtained by laminating a plastic film 22 for surface protection, a metal foil 24 as a gas barrier layer, and a plastic film 26 for internal protection in three layers. Specifically, a polypropylene film having a thickness of about 30 μm, an aluminum foil having a thickness of about 60 μm, and a nylon film having a thickness of about 15 μm can be used. Here, the polypropylene film layer is disposed on the outer surface side of the sheet material case 12 as the plastic film 22 for surface protection, and the nylon film is disposed on the battery power generation element 14 side as the plastic film 26 for internal protection.

  On the nylon film side of the laminate film 20, a layer of a heat-weldable adhesive material 28 is further provided. Specifically, polypropylene having a thickness of about 30 μm can be used. Polypropylene of this thickness melts in about a few seconds by applying a high temperature and high pressure of, for example, 220 ° C. and 50 atm, and is sandwiched between two plastics to be melted together. Can be glued to. The adhesive 28 may be provided over the entire surface of the laminate film 20, but is provided at the joint of the laminate film 20 that performs hermetic sealing at least at the peripheral edge of the sheet material case 12. That is, the adhesive 28 is disposed on the surface of the nylon film, which is the internal protective plastic film 26, around the periphery along the flange 13 of the sheet material case 12.

  In the collar portion 13 of the sheet material case 12, an intervening layer 18 provided in the electrode terminal 16 portion is provided between the electrode terminal 16 which is a metal material and the laminate film 20, and sufficient airtight sealing therebetween is provided. It has a function. In other words, heat-weldable polypropylene is suitable for bonding between plastic materials, but is not sufficient as it is for bonding between metal materials and plastic materials. Therefore, an intervening layer is used to form a structure of metal material-intervening layer 18-adhesive 28-nylon, and the intervening layer 18 and the adhesive 28 are heated and melted, so that a synergistic effect between the metal material and the nylon is obtained. This is to ensure hermetic sealing. The intervening layer 18 is preferably a plastic film that melts under heat and pressure and has good compatibility with the adhesive. Specifically, the intervening layer 18 is disposed using a modified polypropylene so as to surround the base portion of the electrode terminal 16. can do.

  Therefore, in a state where the sheet material case 12 on which the adhesive material 28 is disposed is opened, the battery power generation element 14 with the electrode terminals 16 is set, the sheet material case 12 is closed, and then the flange portion 13 is heated. The seam can be heat-welded by heating under pressure and the like to melt the adhesive 28 and the intervening layer 18. In this way, the electrode terminal 16 can be pulled out from the battery power generation element 14 and the sheet material case 12 can be hermetically sealed. Then, electrolyte solution injection | pouring is performed and the function as a battery is exhibited. The electrolyte solution injection is performed by providing an appropriate injection port in the sheet material case 12, injecting the electrolyte solution from the injection port toward the battery power generation element 14 using an electrolyte solution injection device, and then closing the injection port. Can do.

  As will be described later, the reinforcing member 30 is formed by resin molding so as to be integrated with the sheet material case 12 including the battery power generation element 14 and the like by using a so-called insert molding technique. FIG. 4 is a partial perspective view in which the sheet material case 12 is omitted and only the reinforcing material 30 is extracted. In this manner, the reinforcing member 30 is connected to the frame-shaped frame body portion 32 that reinforces the portion along the flange portion 13 of the sheet material case 12 and the opposite sides of the frame body portion 32, and It is a resin molding member comprised from the up-and-down swelling part 11, ie, the some rib part 34 which reinforces an up-and-down flat surface, respectively. As a material of the reinforcing material 30, polypropylene reinforced with glass fiber or the like can be used.

  The rib portion 34 is arranged along the bulging portion 11 of the sheet material case 12, and the arrangement direction thereof is performed in a direction that can effectively suppress the expansion of the flat surface when the sheet material type battery 10 is operated. Are preferred. Like the battery power generation element 14 described above, a separator is overlapped between two electrode bodies, and this is wound into a roll shape. In the direction perpendicular to the winding axis of the roll, the battery operates. The flat surface tends to expand. That is, if the electrode terminal 16 is pulled out in the winding axis direction of the roll, the flat surface easily expands in a direction perpendicular to the pulling-out direction of the electrode terminal 16, and therefore the rib portion 34 is arranged in this direction. preferable.

  FIG. 5 is a flowchart of a method for manufacturing the sheet material type battery 10 having such a configuration. The procedure for manufacturing the sheet material type battery 10 will be described below using this flowchart.

  In the power generation element forming step (S10), as described above, the separator is sandwiched between the two electrode bodies coated with the active material, wound in a roll shape, and the electrolyte is still soaked. This is a step of forming a battery power generation element 14 that is not. The electrode connecting step (S12) is a step of connecting aluminum and copper electrode terminals 16 to the two electrode bodies by welding or the like and pulling them out from the battery power generation element 14 to the outside.

  Next, the sheet material is wrapped (S14). And the sheet | seat material case 12 is airtightly sealed in the state which accommodated the electric power generation element 14 for batteries inside, and pulled out the electrode terminal 16 outside. Specifically, as described above, in a state where the sheet material case 12 on which the adhesive material 28 is disposed is opened, the battery power generation element 14 with the electrode terminals 16 is set, and the sheet material case 12 is closed. And the collar part 13 is pressurized and heated with the heated press board etc., the adhesive material 28 grade | etc., Is fuse | melted, a seam is heat-welded, and it seals airtightly. In this way, a battery body not yet provided with the reinforcing material 30 is formed. The electrolyte injection may be performed at this stage, or may be performed after the subsequent steps for forming the reinforcing material 30 are completed.

  Next, the battery body not yet provided with the reinforcing material is placed in a mold of an appropriate injection molding apparatus (S18). Here, a mold for forming the reinforcing member 30 will be described. FIG. 6 is a cross-sectional view of a mold 40 for reinforcing material molding. The mold 40 includes a lower mold 42 and an upper mold 44 that are separated by a partition line 41. And each has the recessed part 50 which receives the swelling part 11 of the sheet | seat material case 12. FIG. The size of the recess 50 is set to be smaller than the outer shape of the bulge portion 11 and the flange portion 13 of the sheet material case 12. And it has the cavity 52 into which the resin inject | poured from the resin injection port which is not shown in figure flows.

  The cavity 52 includes a frame cavity 54 provided on the upper and lower sides and the side surface of the battery body 12 along the flange portion 13 of the battery body, and a rib cavity 56 that connects opposite sides of the frame cavity 54. . The recess 50 and the cavity 52 are both depressions on the inner surface of the mold 40, but resin is injected into the latter, but resin is not injected into the former. That is, the recess 50 is not directly connected to a resin injection port (not shown), and there is no gap between the bulge 11 of the sheet material case 12 and the recess 50 in the battery body. Does not flow in.

  Therefore, when the battery body is disposed inside the mold 40 and the mold 40 is closed, the recess 50 applies the bulging portion 11 of the sheet material case 12 in the battery body to the mold inner wall with the mold clamping pressure. It has a dimension forming function that presses and regulates the dimensions of the bulge portion 11 and the like.

  FIG. 7 is a view showing a state in which the battery body 36 not yet provided with the reinforcing material 30 is set in the lower mold 42 by opening the mold. The recess 50 of the lower mold 42 corresponds to the lower bulge portion 11 that does not appear in the drawing of the battery body 36. The frame cavity 54 is provided corresponding to the lower surface side and the side surface side of the flange 13 of the battery body 36, and the rib cavity 56 is further dug into a part of the recess 50. The battery body 36 is placed on the lower mold 42 as indicated by the white arrow in FIG. 7, and the upper mold 44 is placed on the battery body 36, and the battery body 36 is disposed inside the mold 40 by being firmly tightened. Is done.

  Returning to FIG. 5 again, resin molding and pressure dimension molding of the reinforcing material 30 are performed (S20). Specifically, the bulging portion 11 and the like are pressurized by the inner wall of the mold of the recess 50, and the flat surface is regulated to the outer dimension determined by the recess dimension. In this state, molten resin is injected from the resin injection port of the mold 40. Is pressurized and flows into the cavity 52. Since the molten resin is also pressurized, the bulging portion 11 and the like that are not restricted by the inner wall of the mold of the recess 50 are also pressed by the pressurized molten resin, and excess bulging is restricted. Then, by proceeding with the crosslinking reaction in the cavity, the part corresponding to the frame body cavity 54 of the cavity 52 is subjected to resin molding as the frame body part 32 that sandwiches the flange part 13 of the battery body 36, and the rib cavity 56. The resin molding is performed as a plurality of upper and lower rib portions 34 that connect opposite sides of the frame body portion 32.

  The resin injection amount, pressurization, temperature, and other sequences for this resin molding are executed under the control of a molding control unit in an injection molding apparatus (not shown). As described above, a glass fiber reinforced styrene resin can be used as the resin. As an example of the molding conditions in this case, the molten resin temperature can be 220 ° C., the pressurization can be 50 atm, the injection time can be 5 seconds, and the pressurization time including the injection time can be 15 seconds.

  Thus, the frame portion 32 and the plurality of rib portions 34 are integrally molded with resin. Thus, the hermetically sealed end portion of the battery body 36 is sandwiched and reinforced, and the bulging portion 11 of the battery body 36, that is, the reinforcing member 30 that reinforces the flattened direction of the flat surface is integrated with the battery body 36 and is molded into a resin. Is done.

  If the resin molding is sufficiently performed, mold removal (S22) is performed to take out the battery that has been adhered and sandwiched from the mold 40 (S22), and a sheet material type battery integrated with the reinforcing material 30 is obtained (S24). Thus, the sheet material type battery shown in FIG. 1 is completed.

  In the sheet material type battery 10 thus completed, the outer dimensions including the reinforcing material 30 are determined by the dimensions of the recess 50 and the cavity 52 of the mold 40. Therefore, by improving the mold dimensions, the outer dimensions of the sheet-type battery 10 including the reinforcing material 30 can be set to an accuracy of, for example, a few tenths of a millimeter or μm.

  By using the sheet material type battery 10 whose outer dimensions are determined by mold accuracy, an assembled battery with good dimensional accuracy can be obtained. FIG. 8 is a view showing a part of the assembled battery 60 in which a plurality of the sheet material type batteries 10 described in FIG. 1 are arranged and arranged so that their flat surfaces face each other. Now, assuming that the dimension along the direction in which the sheet material type battery 10 is arranged and arranged is H ± Δh, in the example of FIG. 8, this dimension is determined by the outer dimension of the rib portion 34 of the sheet material type battery 10. That is, it is determined by the dimension of the rib cavity 56 of the mold 40 described in FIG.

  Now, when the assembled battery 60 is configured by arranging n sheet material type batteries 10 in an aligned manner, the total dimension in the direction in which the assembled battery 60 is aligned is n × (H ± Δh). For example, when n = 80, the conventional technique has no reinforcing material, and the dimensional accuracy of one sheet material type battery is ± 0.05 mm at most including the operation, and the total dimensional accuracy of the assembled battery is ± 4 mm. Is the best. On the other hand, the mold accuracy is remarkably good, and the dimensional accuracy of the reinforcing material 30 can be suppressed to ± several μm. Therefore, the accuracy of the total size of the assembled battery 60 can be suppressed to about ± 1 mm or less.

  As for the assembled battery 60, not only the series arrangement shown in FIG. 8 but also those arranged in series may be further arranged in parallel. In such a case, the total size of the assembled battery is determined by the dimensional accuracy of the frame body portion 32. In any case, the assembled battery can be configured with a highly accurate external dimension.

  The sheet type battery according to the present invention and the assembled battery in which the sheet type battery is arranged and arranged can be used as a power source for a vehicle. Moreover, it can use for uses other than a vehicle, for example, household appliances, or can be used for an industrial apparatus.

It is the top view and side view of a sheet material type battery in an embodiment according to the present invention. In embodiment which concerns on this invention, it is a figure which shows a mode that the electric power generation element for batteries to which the electrode terminal was connected is accommodated in a sheet | seat material case. FIG. 2 is a structural diagram of a cross section taken along line AA in FIG. 1. In embodiment which concerns on this invention, it is the figure which abbreviate | omitted the sheet | seat material case and showed only the reinforcing material. It is a flowchart of the manufacturing method of the sheet material type battery in embodiment which concerns on this invention. It is sectional drawing of the metal mold | die for reinforcement material shaping | molding in embodiment which concerns on this invention. In embodiment which concerns on this invention, it is a figure which shows a mode that a battery body is set to a lower metal mold | die. In other embodiment which concerns on this invention, it is a figure which shows a part of assembled battery which arranged the sheet material type battery in multiple numbers.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Sheet material type battery, 11 Swelling part, 12 Sheet material case, 13 collar part, 14 Power generation element for battery, 16 Electrode terminal, 18 Interposition layer, 20 Laminate film, 22, 26 Plastic film, 24 Metal foil, 28 Adhesive , 30 Reinforcement material, 32 Frame body part, 34 Rib part, 36 Battery body, 40 Mold, 41 Partition line, 42 Lower mold, 44 Upper mold, 50 Recess, 52 cavity, 54 Cavity for frame, 56 Rib Cavity for 60 batteries.

Claims (5)

Enveloping the battery power generation element with the sheet material, pulling out both electrodes from the battery power generation element to the outside, hermetically sealing and storing the end of the sheet material, and forming a substantially flat rectangular battery body;
The battery body is placed in the reinforcing material molding die, and the frame body part that sandwiches the hermetic sealing end along the rectangular periphery of the battery body and the opposite sides of the frame body part are connected along the flat surface of the battery body. A step of resin-molding a reinforcing material composed of a rib portion and press-molding a portion where resin molding is not performed on the flat surface of the battery body with the inner wall of the mold,
A sheet material type battery manufacturing method comprising: In the sheet material type battery manufacturing method according to claim 1,
The battery body is deformed so that the flat surface expands outward by use of charge and discharge, and the deformation along the direction orthogonal to the drawing direction of both electrodes is larger than the deformation along the drawing direction of both electrodes,
A rib part is arrange | positioned along the direction orthogonal to the extraction direction of both electrodes, The sheet material type battery manufacturing method characterized by the above-mentioned. In the sheet material type battery manufacturing method according to claim 1,
The resin used for resin molding is a glass fiber reinforced resin. A substantially flat rectangular battery body that encloses the battery power generation element with a sheet material, draws both electrodes from the battery power generation element to the outside, and hermetically seals and stores the end of the sheet material;
Reinforcing material formed by resin molding integrally with a frame body portion that sandwiches the hermetic sealing end along the rectangular periphery of the battery body and a rib portion that connects opposite sides of the frame body along the flat surface of the battery body When,
A sheet material type battery comprising: An assembled battery in which a plurality of substantially flat rectangular cells are arranged and arranged so that the flat surfaces face each other,
Single cell
A substantially flat rectangular battery body that encloses the battery power generation element with a sheet material, draws both electrodes from the battery power generation element to the outside, and hermetically seals and stores the end of the sheet material;
The frame part that sandwiches the hermetic sealing end along the periphery of the battery body parallel to the flat surface of the battery body and the rib part that connects the opposite sides of the frame body along the flat surface of the battery body A reinforcing material formed by resin molding;
An assembled battery combining sheet material type single cells, wherein the overall dimensions are determined by integrating the external dimensions of the reinforcing material whose dimensions are controlled by resin molding.

Images