JP2009266690A - Method of manufacturing power storage device and metal battery case - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a power storage device and a metal battery case, in which deformation of the metal battery case due to inner pressure of a power storage cell can be prevented, a passage of a cooling medium can be secured, and the number of parts can be reduced so that down-sizing and weight reduction can be promoted and manufacturing cost can be reduced. <P>SOLUTION: In the power storage device 10, a plurality of power storage cells 11 in which power storage elements are housed in the square shaped metal battery case 12 are electrically connected, and are arranged so that a gap is formed between the metal battery cases 12, while the metal battery case 12 includes the square shaped metal case 17 in which recesses and protrusions are formed on the outer surface 18, and a resin part 19 that is integrally injection-molded on the outer surface 18 of the metal case 17. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a power storage device mounted on a fuel cell vehicle, an electric vehicle, a plug-in hybrid vehicle, a hybrid vehicle, and the like, and a method for manufacturing a metal battery case.

  In general, a power storage device configured by stacking a plurality of power storage cells such as a nickel metal hydride battery or a lithium battery is used as a driving power source for an electric vehicle or the like. In such a power storage device, a plurality of prismatic power storage cells are stacked to save space. In addition, cooling for suppressing a temperature rise due to heat generation during charging / discharging, or heating when cooled may be required.

  As a conventional power storage device, a heat insulating member having a heat insulating layer covering the entire surface of the square battery is interposed between adjacent square batteries, and a passage through which a cooling medium flows between the heat insulating member and the square battery Is known (for example, see Patent Document 1). Moreover, what was provided with the restraining jig | tool which has the connection member arrange | positioned through the clearance gap between the both ends of the several battery module with which the cell was combined, and the cell is known (for example, refer patent document 2).

  In addition, when a module or an assembled battery is formed by combining a plurality of batteries using a metal battery case, in order to insulate the metal battery case or protect the metal battery case, a heat-shrinkable tube or an adhesive film may be used as a metal battery. It is known to be placed on the outer surface of the tank.

JP 2004-362879 A Japanese Patent Laying-Open No. 2005-5167

  By the way, in the power storage device described in Patent Document 1 and Patent Document 2, in order to provide a passage through which a cooling medium flows between adjacent square batteries, another component in which a protrusion such as a rib is formed is interposed. Since the battery assembly is configured, there is room for improvement because it is difficult to reduce the size, weight, and cost. In addition, when a protective film having electrical insulation is provided on the outer surface of the metal battery case, the heat shrinkable tube has a problem that wrinkles and floats occur at the corners of the metal battery case. Moreover, according to the sticking film, the metal surface of the metal battery case may be exposed at the end of the sticking film, or peeling may occur due to aging of the adhesive.

  The present invention has been made in view of the above circumstances, and its purpose is to prevent deformation of the metal battery case due to the internal pressure of the storage cell, to ensure a passage for the cooling medium, and to reduce the number of parts. An object of the present invention is to provide a method of manufacturing a power storage device and a metal battery case that can be reduced in size and weight and can reduce manufacturing costs.

  In order to achieve the above object, the invention described in claim 1 includes a plurality of power storage cells (for example, a plurality of power storage cells (for example, a metal battery case 12 in the embodiment) accommodated in a rectangular metal battery case (for example, a metal battery case 12 in the embodiment). The power storage cell 11) in the embodiment is a power storage device that is electrically connected and is disposed so as to form a gap between the metal battery cases. The metal battery case has irregularities formed on the outer surface. A rectangular metal case (for example, the metal case 17 in the embodiment) and a resin portion (for example, an implementation) integrally molded on the outer surface of the metal case (for example, the outer surface 18 in the embodiment) And a resin part 19) in the form.

  In the invention according to claim 2, in addition to the configuration of the invention according to claim 1, the resin portion is a rib formed on the long side surface of the metal battery case (for example, the long side surface 20 in the embodiment). For example, it is the rib 23) in the embodiment.

  In the invention according to claim 3, in addition to the configuration of the invention according to claim 2, the resin portion includes a short side surface (for example, the short side surface 21 in the embodiment) and a bottom surface (for example, implementation) of the metal battery case. The ribs are formed on at least one of the bottom surfaces 22) in the form (for example, the ribs 24 in the embodiment).

  According to a fourth aspect of the present invention, in addition to the configuration of the second aspect of the invention, the resin portion is a rib formed on at least one of the short side surface and the bottom surface of the metal battery case, When stacked, a columnar structure is formed.

  In addition to the structure of the invention according to any one of claims 1 to 4, the invention according to claim 5 includes at least one set of recesses (for example, recess 26 in the embodiment) and protrusions. (For example, the convex portion 25 in the embodiment) and when a plurality of power storage cells are stacked, the concave portions and the convex portions of the adjacent power storage cells are fitted to each other, and the relative position of the power storage cells is positioned. It is characterized by that.

  The invention described in claim 6 is characterized in that, in addition to the structure of the invention described in claim 1, the irregularities on the outer surface of the metal case are irregularities on the nanometer level.

  The invention described in claim 7 is characterized in that, in addition to the structure of the invention described in claim 6, the nanometer level irregularities are formed by an immersion treatment in which the irregular surface forming liquid is immersed.

  According to an eighth aspect of the present invention, a plurality of power storage cells each storing a power storage element in a rectangular metal battery case are electrically connected and arranged so as to form a gap between the metal battery cases. The metal battery case is characterized by comprising a square metal case in which a film of a triazine dithiol dielectric is formed on the outer surface, and a resin part that is integrally injection-molded on the outer surface of the metal case. To do.

  According to the ninth aspect of the present invention, a plurality of power storage cells each storing a power storage element in a rectangular metal battery case are electrically connected and arranged so as to form a gap between the metal battery cases. An apparatus, wherein the metal battery case is a rectangular metal case having irregularities formed on the outer surface, a protective film (for example, the protective film 41 in the embodiment) disposed on the outer surface of the metal case, The outer surface exposed from the protective film of a metal case is provided with the resin part integrally injection-molded so that the edge of a protective film may be covered, It is characterized by the above-mentioned.

  The invention described in claim 10 is characterized in that, in addition to the configuration of the invention described in claim 9, the resin portion is a rib formed on the long side surface of the metal battery case.

  According to an eleventh aspect of the present invention, in addition to the structure of the tenth aspect, the resin portion is a rib formed on at least one of the short side surface and the bottom surface of the metal battery case.

  According to a twelfth aspect of the present invention, in addition to the configuration of the tenth aspect of the present invention, the resin portion is a rib formed on at least one of the short side surface and the bottom surface of the metal battery case, When stacked, a columnar structure is formed.

  In addition to the configuration of the invention according to any one of claims 9 to 12, the resin part includes at least one set of recesses and protrusions, and a plurality of storage cells are stacked. In this case, the concave portions and the convex portions of the adjacent power storage cells are fitted to each other, and the relative positions of the power storage cells are positioned.

  The invention described in claim 14 is characterized in that, in addition to the structure of the invention described in claim 9, the irregularities on the outer surface of the metal case are irregularities on the nanometer level.

  The invention described in claim 15 is characterized in that, in addition to the structure of the invention described in claim 14, the nanometer level unevenness is formed by an immersion treatment in which the unevenness surface forming liquid is immersed.

  According to a sixteenth aspect of the present invention, a plurality of power storage cells each storing a power storage element in a rectangular metal battery case are electrically connected and arranged so as to form a gap between the metal battery cases. The metal battery case is exposed from a rectangular metal case having a triazine dithiol dielectric film formed on the outer surface, a protective film disposed on the outer surface of the metal case, and the protective film of the metal case. And a resin portion integrally injection-molded so as to cover the edge of the protective film on the outer surface.

  The invention according to claim 17 is a method of manufacturing a rectangular metal battery case that houses a power storage element and constitutes a power storage cell, wherein the metal plate is pressed to form a square metal case And a surface treatment step of forming irregularities on the outer surface of the metal case, and a molding step of insert molding the metal case and integrally molding the resin portion on the outer surface.

  The invention described in claim 18 is characterized in that, in addition to the configuration of the invention described in claim 17, the irregularities on the outer surface of the metal case are irregularities on the nanometer level.

  The invention described in claim 19 is characterized in that, in addition to the configuration of the invention described in claim 18, the nanometer level unevenness is formed by an immersion treatment in which the unevenness surface forming solution is immersed.

  The invention according to claim 20 is a method of manufacturing a rectangular metal battery case that houses a power storage element and constitutes a power storage cell, wherein the metal plate is pressed to form a square metal case And a surface treatment step of forming a film of triazine dithiol dielectric on the outer surface of the metal case, and a molding step of insert molding the metal case and integrally molding the resin portion on the outer surface.

  The invention according to claim 21 is a method of manufacturing a rectangular metal battery case that houses a power storage element and constitutes a power storage cell, wherein the metal plate is pressed to form a rectangular metal case. And a surface treatment process for forming irregularities on the outer surface of the metal case, a film temporary fixing process for temporarily fixing the protective film at a predetermined position on the outer surface of the metal case, and protection of the metal case by insert molding the metal case. And a molding step of integrally molding the resin portion so as to cover the edge of the protective film on the outer surface exposed from the film.

  The invention described in claim 22 is characterized in that, in addition to the configuration of the invention described in claim 21, the irregularities on the outer surface of the metal case are irregularities on the nanometer level.

  The invention described in claim 23 is characterized in that, in addition to the configuration of the invention described in claim 22, the nanometer level unevenness is formed by an immersion treatment of immersion in an uneven surface forming liquid.

  The invention according to claim 24 is a method of manufacturing a rectangular metal battery case that houses a power storage element and constitutes a power storage cell, wherein the metal plate is pressed to form a square metal case A surface treatment step of forming a film of a triazine dithiol dielectric on the outer surface of the metal case, a film temporary fixing step of temporarily fixing a protective film at a predetermined position on the outer surface of the metal case, and insert molding the metal case And a molding step of integrally molding the resin portion so as to cover the edge of the protective film on the outer surface exposed from the protective film of the metal case.

  According to the power storage device of the first aspect, since the resin portion is integrally injection-molded on the outer surface of the rectangular metal case having the unevenness formed on the outer surface, the resin portion is firmly formed on the outer surface of the metal case. Can be fixed.

  According to the power storage device of the second aspect, since the mechanical strength of the long side surface of the metal battery case can be improved, the deformation of the long side surface of the metal battery case due to the internal pressure of the power storage cell can be prevented. In addition, since a cooling medium passage for circulating cooling air or the like can be formed between adjacent power storage cells by the ribs, heat generation of the power storage cells due to charge / discharge can be effectively cooled to prevent a temperature rise. In addition, it is possible to suppress a decrease in electrical characteristics of the storage cell. In addition, since it is not necessary to separately prepare a member for forming the cooling medium passage, the number of parts can be reduced, the power storage device can be reduced in size and weight, and the manufacturing cost can be reduced. it can.

  According to the power storage device of claim 3, since the mechanical strength of at least one of the short side surface and the bottom surface of the metal battery case can be improved, at least the short side surface and the bottom surface of the metal battery case due to the internal pressure of the power storage cell. One deformation can be prevented.

  According to the power storage device of the fourth aspect, since the plurality of power storage cells can be integrally assembled by the columnar structure formed by the ribs, the rigidity of the entire power storage device can be increased.

  According to the power storage device of the fifth aspect, since the plurality of power storage cells can be easily stacked and arranged, the assembling property of the power storage device can be improved. In addition, since the assembly rigidity of the plurality of power storage cells can be increased, the reliability and safety of the power storage device used under severe use conditions such as for vehicle mounting can be improved.

  According to the power storage device of the ninth aspect, since the entire outer surface of the metal case can be covered with the protective film and the resin part without any gap, the power storage cell can be protected electrically and mechanically. In addition, since the resin part is firmly fixed to the outer surface of the metal case so as to cover the edge of the protective film, even if the adhesive for fixing the protective film to the outer surface of the metal case deteriorates due to secular change The protective film can be securely fixed to the metal case over a long period of time.

  According to the power storage device of the tenth aspect, since the mechanical strength of the long side surface of the metal battery case can be improved, the deformation of the long side surface of the metal battery case due to the internal pressure of the power storage cell can be prevented. In addition, since a cooling medium passage for circulating cooling air or the like can be formed between adjacent power storage cells by the ribs, heat generation of the power storage cells due to charge / discharge can be effectively cooled to prevent a temperature rise. In addition, it is possible to suppress a decrease in electrical characteristics of the storage cell. In addition, since it is not necessary to separately prepare a member for forming the cooling medium passage, the number of parts can be reduced, the power storage device can be reduced in size and weight, and the manufacturing cost can be reduced. it can.

  According to the power storage device of claim 11, since the mechanical strength of at least one of the short side surface and the bottom surface of the metal battery case can be improved, at least the short side surface and the bottom surface of the metal battery case due to the internal pressure of the power storage cell. One deformation can be prevented.

  According to the power storage device of the twelfth aspect, since the plurality of power storage cells can be integrally assembled by the columnar structure with ribs, the rigidity of the entire power storage device can be increased.

  According to the power storage device of the thirteenth aspect, since the plurality of power storage cells can be easily stacked and arranged, the assembling property of the power storage device can be improved. In addition, since the assembly rigidity of the plurality of power storage cells can be increased, the reliability and safety of the power storage device used under severe use conditions such as for vehicle mounting can be improved.

  According to the metal battery case manufacturing method of the seventeenth aspect, it is possible to easily manufacture a metal battery case in which the resin portion is firmly fixed to the outer surface of the metal case.

  According to the metal battery case manufacturing method of claim 21, the resin portion is firmly fixed to the outer surface of the metal case, and the entire outer surface of the metal case is covered with the protective film and the resin portion without a gap. A metal battery case can be easily manufactured.

  Hereinafter, each embodiment of the manufacturing method of the electrical storage apparatus and metal battery case which concerns on this invention is described in detail based on an accompanying drawing. The drawings are viewed in the direction of the reference numerals.

(First embodiment)
First, with reference to FIGS. 1-4, 1st Embodiment of the manufacturing method of the electrical storage apparatus and metal battery case which concerns on this invention is described.

  As shown in FIGS. 1 to 4, the power storage device 10 of the present embodiment is configured by stacking a plurality of power storage cells 11 such as lithium batteries. The power storage cell 11 is mainly formed in a rectangular parallelepiped shape. A rectangular metal battery case 12 having an outer shape, a positive electrode terminal 13 and a negative electrode terminal 14 are electrically connected to each other and a power storage element (not shown) accommodated in the metal battery case 12, and an upper opening of the metal battery case 12 And a lid portion 15 for closing.

  The lid 15 is joined to the upper opening of the metal battery case 12 with the positive electrode terminal 13 and the negative electrode terminal 14 exposed to the outside, and the gas generated in the storage cell 11 is discharged at a substantially central portion thereof. The gas discharge valve 16 is provided.

  As shown in FIG. 2, the metal battery case 12 is integrally injected onto a metal case 17 in which a thin plate made of aluminum, copper-based metal, or the like is formed into a bottomed rectangular parallelepiped box shape by pressing, and an outer surface 18 of the metal case 17. And a resin part 19 to be molded. The resin portion 19 is formed by insert molding a synthetic resin such as a PBT resin or a PPS resin into the metal case 17 by a normal injection molding apparatus.

  In this embodiment, the outer surface 18 of the metal case 17 is subjected to a special surface treatment prior to injection molding, and has extremely fine irregularities on the nanometer level (20 nm to 30 nm). The special surface treatment such as aluminum or copper metal will be described later.

  The resin portion 19 includes a plurality of ribs 23 formed transversely on the long side surface 20 of the metal case 17 and a plurality of ribs 24 formed transversely and longitudinally on the short side surface 21 and the bottom surface 22 of the metal case 17. And having. The rib 23 is formed with cylindrical convex portions 25 at the upper left, lower right, upper left corner, and lower right corner of the metal battery case 12, and the lower left, upper right, lower left corner, and upper right corner. Circular recesses 26 are formed at the corners. Further, on the back surface side of the metal battery case 12, a concave portion 26 is formed at a position corresponding to the convex portion 25 on the front surface side, and a convex portion 25 is formed at a position corresponding to the concave portion 26 on the front surface side. Further, the outer diameter of the convex portion 25 and the inner diameter of the concave portion 26 are the same, and when the plurality of power storage cells 11 are stacked, the convex portion 25 and the concave portion 26 are fitted to each other, and a plurality of adjacent power storage cells 11 relative positions are positioned. The rib 24 is formed with a pair of columnar convex portions 27.

  In the present embodiment, as shown in FIG. 4, a plurality (ten in this embodiment) of storage cells 11 are arranged such that the positive electrode terminals 13 and the negative electrode terminals 14 are alternately arranged, and adjacent storage cells 11. The protrusions 25 and the recesses 26 are stacked while being positioned. At this time, the ribs 23 and 24 of the metal battery case 12 are in close contact with each other to form a columnar structure, whereby the rigidity of the entire power storage device 10 is increased.

  In the present embodiment, the high-rigidity pressure plates 30 are arranged at both ends of the stacked power storage cells 11 on the long side surface 20 side. In addition, constraining plates 31 having engagement holes 32 formed at regular intervals are arranged on both surfaces of the stacked power storage cells 11 on the short side surface 21 side, and the engagement holes 32 are fitted to the convex portions 27 of the ribs 24. Then, both ends of the restraint plate 31 are fixed to the pressure plate 30, and the stacked power storage cells 11 are fixed integrally. And the electrical storage apparatus 10 is completed by electrically connecting the positive electrode terminal 13 and the negative electrode terminal 14 with the electrically-conductive members 33, such as a copper plate.

  In the power storage device 10 configured as described above, the cooling medium passage 34 is formed between the adjacent power storage cells 11 by the ribs 23 and the long side surfaces 20 of the power storage cells 11. By circulating cooling air or the like, the heat generation of the storage cell 11 due to charging / discharging is effectively cooled and the temperature rise is prevented, so that the deterioration of the electrical characteristics of the storage cell 11 is suppressed.

  Next, the manufacturing method of the metal battery case 12 is demonstrated. First, deep drawing is performed on a thin plate of aluminum or the like to form a bottomed rectangular parallelepiped box, and the metal case 17 is manufactured (processing step). Next, a special surface treatment is performed on the outer surface 18 of the metal case 17 to form nanometer-level ultra-fine irregularities (surface treatment step). Then, the metal case 17 having a special surface treatment applied to the outer surface 18 is insert-molded by a normal injection molding machine, and the ribs 23, which are the resin portions 19, are formed on the long side surface 20, the short side surface 21, and the bottom surface 22. 24, the convex parts 25 and 27, and the recessed part 26 are formed (molding process). As a result, the resin part 19 is molded by the synthetic resin entering the dimples having a diameter of 20 to 300 nm, for example, formed on the outer surface 18 by the special surface treatment, and the resin part 19 is firmly fixed to the outer surface 18. A metal battery case 12 is manufactured.

  The special surface treatment of the present embodiment includes, for example, an alkali treatment immersed in an alkali solution, an acid treatment immersed in an acid solution, and then an immersion treatment immersed in an uneven surface forming solution, or a triazine dithiol derivative in water. Alternatively, in an electrolytic cell containing an electrolytic solution dissolved in an organic solution, an organic plating film is formed by performing organic plating treatment with a triazine dithiol dielectric on the outer surface 18 of the metal case 17 to form a film of triazine dithiol dielectric on the metal surface. Processing etc. are applied.

  Then, a power storage element (not shown) is accommodated in the metal battery case 12, and an electrolytic solution is injected to impregnate the power storage element. Then, as shown in FIG. The storage cell 11 is manufactured by airtightly bonding the part 15.

  As described above, according to the power storage device 10 of the present embodiment, the metal battery case 12 includes the rectangular metal case 17 with the nanometer level unevenness formed on the outer surface 18 and the outer surface 18 of the metal case 17. Therefore, the resin part 19 can be firmly fixed to the outer surface 18 of the metal case 17.

  Moreover, according to the electrical storage apparatus 10 of this embodiment, since the resin part 19 is the rib 23 formed in the long side surface 20 of the metal battery case 12, the mechanical strength of the long side surface 20 of the metal battery case 12 is improved. Therefore, the deformation of the long side surface 20 of the metal battery case 12 due to the internal pressure of the storage cell 11 can be prevented. Further, since the cooling medium passage 34 that allows cooling air or the like to flow between the adjacent storage cells 11 can be formed by the ribs 23, the heat generation of the storage cells 11 due to charge / discharge can be effectively cooled to prevent a temperature rise. It is possible to suppress the deterioration of the electrical characteristics of the storage cell 11. In addition, since it is not necessary to separately prepare a member for forming the cooling medium passage 34, the number of components can be reduced, the power storage device 10 can be reduced in size and weight, and the manufacturing cost can be reduced. be able to.

  Moreover, according to the electrical storage apparatus 10 of this embodiment, since the resin part 19 is the rib 24 formed in the short side surface 21 and the bottom face 22 of the metal battery case 12, the short side surface 21 and the bottom face 22 of the metal battery case 12 are included. Therefore, the deformation of the short side surface 21 and the bottom surface 22 of the metal battery case 12 due to the internal pressure of the storage cell 11 can be prevented.

  Further, according to the power storage device 10 of the present embodiment, the resin portion 19 is a rib 24 formed on the short side surface 21 and the bottom surface 22 of the metal battery case 12, and when the plurality of power storage cells 11 are arranged in a stacked manner, Since the plurality of power storage cells 11 can be assembled integrally, the rigidity of the power storage device 10 as a whole can be increased.

  In addition, according to the power storage device 10 of the present embodiment, the resin portion 19 includes at least one pair of concave portions 26 and convex portions 25, and when the plurality of power storage cells 11 are stacked, the concave portions 26 of the adjacent power storage cells 11 are disposed. And the convex portion 25 are fitted to each other, and the relative position of the storage cell 11 is positioned. Therefore, a plurality of storage cells 11 can be easily stacked and arranged, so that the assembly of the storage device 10 is improved. Can do. Moreover, since the assembly | attachment rigidity of the some electrical storage cell 11 can be improved, the reliability and safety | security of the electrical storage apparatus 10 used on severe use conditions, such as for vehicle mounting, can be improved.

  Moreover, according to the manufacturing method of the metal battery case 12 of this embodiment, the metal plate is pressed to form the rectangular metal case 17, and the nanometer level irregularities are formed on the outer surface 18 of the metal case 17. The resin portion 19 is firmly fixed to the outer surface 18 of the metal case 17 because the surface treatment step to be formed and the molding step in which the metal case 17 is insert-molded and the resin portion 19 is integrally formed on the outer surface 18 are provided. The metal battery case 12 can be easily manufactured.

(Second Embodiment)
Next, with reference to FIGS. 5-10, 2nd Embodiment of the manufacturing method of the electrical storage apparatus and metal battery case which concerns on this invention is described. The power storage device of this embodiment is the same as the power storage device of the first embodiment except that a protective film is disposed on the long side surface of the metal case and the resin portion is injection-molded. The same reference numerals or equivalent reference numerals are attached, and the description thereof is simplified or omitted.

  As shown in FIG. 5, the metal battery case 40 of the present embodiment includes a metal case 17 (see FIG. 1) in which irregularities of nanometer level are formed on the outer surface 18 as in the first embodiment, and a metal case 17. The protective film 41 is temporarily fixed to the long side surface 20 with an adhesive or adhesive tape, and the outer surface 18 exposed from the protective film 41 of the metal case 17 is integrally injection-molded so as to cover the edge of the protective film 41. A resin part 19.

  The protective film 41 is insulative and has substantially the same size as the long side surface 20 and covers almost the entire surface of the long side surface 20. The protective film 41 is formed with a plurality of (seven in this embodiment) slit holes 42 in a direction crossing the long side surface 20, and the long side surface 20 of the metal case 17 is exposed from the slit holes 42. is doing. The protective film 41 may be disposed not only on the long side surface 20 of the metal case 17 but also on the short side surface 21 and the bottom surface 22 as necessary.

  Next, a method for manufacturing the metal battery case 40 will be described. First, deep drawing is performed on a thin plate of aluminum or the like to form a bottomed rectangular parallelepiped box, and the metal case 17 is manufactured (processing step). Next, a special surface treatment is performed on the outer surface 18 of the metal case 17 to form nanometer-level ultra-fine irregularities (surface treatment step). Next, the protective film 41 is temporarily fixed to the long side surface 20 of the metal case 17 with an adhesive or an adhesive tape (film temporary fixing step). Then, the metal case 17 with the protective film 41 temporarily fixed to the long side surface 20 is insert-molded by a normal injection molding machine, and the ribs 23 and 24, the convex portions are formed on the long side surface 20, the short side surface 21, and the bottom surface 22. 25 and 27, and the recessed part 26 are formed (molding process). Thereby, as shown in FIG. 6, for example, a synthetic resin enters a dimple having a diameter of 20 to 300 nm formed on the outer surface 18 exposed from the slit hole 42 of the protective film 41, and the resin portion 19 is molded. A metal battery case 40 in which the resin part 19 is firmly fixed to the outer surface 18 is manufactured. Moreover, since the resin part 19 is shape | molded so that the edge part of the slit hole 42 may be covered, even if an adhesive agent, an adhesive tape, etc. deteriorate by aging etc., the protective film 41 will not peel to the metal case 17. Securely fixed.

  As described above, according to the power storage device 10 of the present embodiment, the metal battery case 40 includes the rectangular metal case 17 having the nanometer level irregularities formed on the outer surface 18 and the outer surface 18 of the metal case 17. And a resin part 19 integrally injection-molded on the outer surface 18 exposed from the protective film 41 of the metal case 17 so as to cover the edge of the slit hole 42 of the protective film 41. Therefore, since the entire outer surface 18 of the metal case 17 can be covered with the protective film 41 and the resin part 19 without a gap, the storage cell 11 can be protected electrically and mechanically. Moreover, since the resin part 19 is firmly fixed to the outer surface 18 of the metal case 17 so as to cover the edge of the slit hole 42 of the protective film 41, the protective film 41 is fixed to the outer surface 18 of the metal case 17. Even if the adhesive or the like deteriorates due to aging, the protective film 41 can be reliably fixed to the metal case 17 over a long period of time.

  Moreover, according to the electrical storage apparatus 10 of this embodiment, since the protective film 41 is a sheet form, a wrinkle and a float generate | occur | produce compared with the case where the metal battery case 40 is covered with a heat contraction tube etc. conventionally. The metal battery case 40 can be covered without this.

In addition, according to the method for manufacturing the metal battery case 40 of the present embodiment, the processing step of pressing the metal plate to form the square metal case 17, and the nanometer level unevenness on the outer surface 18 of the metal case 17 A surface treatment process to be formed, a film temporary fixing process for temporarily fixing the protective film 41 at a predetermined position on the outer surface 18 of the metal case 17, and an insert molding of the metal case 17 to be exposed from the protective film 41 of the metal case 17. The resin part 19 is firmly fixed to the outer surface 18 of the metal case 17 because the resin part 19 is integrally formed on the outer surface 18 so as to cover the edge of the slit hole 42 of the protective film 41. In addition, the metal battery case 40 in which the entire outer surface 18 of the metal case 17 is covered with the protective film 41 and the resin part 19 without any gap can be easily manufactured.
About another structure and an effect, it is the same as that of the said 1st Embodiment.

  As a first modification of the present embodiment, as shown in FIGS. 7 and 8, instead of the linear slit hole 42, a plurality of protective films 41 are provided in the direction crossing the long side surface 20 (this embodiment). In this case, seven broken-line slit holes 43 may be formed. And in this modification, although the rib 23 is continuously formed in the horizontal direction in the upper edge part and lower edge part of the long side surface 20, respectively, the intermediate part (5 in this embodiment) of the long side surface 20 is formed. Are formed in the shape of a broken line in the horizontal direction in accordance with the position of the slit hole 43 in the shape of a broken line.

  Further, as a second modification of the present embodiment, as shown in FIGS. 9 and 10, the long side surface 20 is vertically cut in the protective film 41 instead of the slit hole 42 formed in the direction crossing the long side surface 20. A plurality of (13 in the present embodiment) slit holes 44 may be formed in the direction in which they are formed. And in this modification, the linear rib 45 is formed in the longitudinal direction in the long side surface 20 of the metal case 17 according to the position of the slit hole 44 of the protective film 41, respectively.

In addition, this invention is not limited to what was illustrated by said each embodiment, In the range which does not deviate from the summary of this invention, it can change suitably.
For example, in each of the above embodiments, the resin portion has been described as a rib. However, the present invention is not limited to this, as long as it can form a cooling medium passage (gap) that allows a cooling medium to pass between adjacent power storage cells. The shape is arbitrary, such as a circle, an ellipse, a rectangle, and a polygon.

It is a perspective view for demonstrating the metal case of the electrical storage apparatus which concerns on this invention, and the manufacturing method of a metal battery case. It is a figure for demonstrating 1st Embodiment of the electrical storage apparatus which concerns on this invention, (a) is a perspective view of a metal battery case, (b) is an AA arrow directional cross-sectional view of (a). It is a perspective view of the electrical storage cell of 1st Embodiment of the electrical storage apparatus which concerns on this invention. 1 is a perspective view of a first embodiment of a power storage device according to the present invention. It is a figure for demonstrating 2nd Embodiment of the electrical storage apparatus which concerns on this invention, (a) is a perspective view of the metal case by which the protective film was temporarily fixed to the outer surface, (b) is B- of (a). It is B line arrow sectional drawing. It is a figure for demonstrating the metal battery case of 2nd Embodiment, (a) is a perspective view of a metal battery case, (b) is CC sectional view taken on line CC of (a). It is a figure for demonstrating the 1st modification of 2nd Embodiment, (a) is a perspective view of the metal case by which the protective film was temporarily fixed to the outer surface, (b) is the DD line of (a). It is arrow sectional drawing. It is a figure for demonstrating the metal battery case of the 1st modification of 2nd Embodiment, (a) is a perspective view of a metal battery case, (b) is the EE arrow directional cross-sectional view of (a). is there. It is a figure for demonstrating the 2nd modification of 2nd Embodiment, (a) is a perspective view of the metal case by which the protective film was temporarily fixed to the outer surface, (b) is the FF line of (a). It is arrow sectional drawing. It is a figure for demonstrating the metal battery case of the 2nd modification of 2nd Embodiment, (a) is a perspective view of a metal battery case, (b) is GG arrow directional cross-sectional view of (a). is there.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Power storage device 11 Power storage cell 12 Metal battery case 17 Metal case 18 Outer surface 19 Resin part 20 Long side surface 21 Short side surface 22 Bottom surface 23 Rib (resin part)
24 Rib (resin part)
25 Convex part 26 Concave part 34 Cooling medium passage (gap)
40 Metal battery case 41 Protective film 42 Slit hole 43 Slit hole 44 Slit hole 45 Rib (resin part)

Claims (24)

A plurality of power storage cells that store power storage elements in a rectangular metal battery case are electrically connected and arranged to form a gap between the metal battery cases,
The metal battery case is a rectangular metal case with irregularities formed on the outer surface;
And a resin part integrally injection-molded on the outer surface of the metal case.   The power storage device according to claim 1, wherein the resin portion is a rib formed on a long side surface of the metal battery case.   The power storage device according to claim 2, wherein the resin portion is a rib formed on at least one of a short side surface and a bottom surface of the metal battery case.   The resin part is a rib formed on at least one of a short side surface and a bottom surface of the metal battery case, and constitutes a columnar structure when a plurality of the storage cells are stacked. 2. The power storage device according to 2.   The resin portion includes at least one pair of recesses and protrusions, and when the plurality of the storage cells are stacked, the recesses and the protrusions of the adjacent storage cells are fitted to each other, and the storage cell The power storage device according to claim 1, wherein a relative position is positioned.   The power storage device according to claim 1, wherein the unevenness of the outer surface of the metal case is a nanometer level unevenness.   The power storage device according to claim 6, wherein the unevenness at the nanometer level is formed by a dipping process in which the unevenness is formed in an uneven surface forming liquid. A plurality of power storage cells that store power storage elements in a rectangular metal battery case are electrically connected and arranged to form a gap between the metal battery cases,
The metal battery case is a rectangular metal case having a triazine dithiol dielectric film formed on the outer surface;
And a resin part integrally injection-molded on the outer surface of the metal case. A plurality of power storage cells that store power storage elements in a rectangular metal battery case are electrically connected and arranged to form a gap between the metal battery cases,
The metal battery case is a rectangular metal case with irregularities formed on the outer surface;
A protective film disposed on the outer surface of the metal case;
A power storage device comprising: a resin portion integrally molded to cover an edge of the protective film on an outer surface exposed from the protective film of the metal case.   The power storage device according to claim 9, wherein the resin portion is a rib formed on a long side surface of the metal battery case.   The power storage device according to claim 10, wherein the resin portion is a rib formed on at least one of a short side surface and a bottom surface of the metal battery case.   The resin part is a rib formed on at least one of a short side surface and a bottom surface of the metal battery case, and constitutes a columnar structure when a plurality of the storage cells are stacked. The power storage device according to 10.   The resin portion includes at least one pair of recesses and protrusions, and when the plurality of the storage cells are stacked, the recesses and the protrusions of the adjacent storage cells are fitted to each other, and the storage cell The relative position is positioned, The power storage device according to any one of claims 9 to 12.   The power storage device according to claim 9, wherein the unevenness of the outer surface of the metal case is a nanometer level unevenness.   The power storage device according to claim 14, wherein the nanometer level unevenness is formed by a dipping process in which the unevenness is formed in an uneven surface forming liquid. A plurality of power storage cells that store power storage elements in a rectangular metal battery case are electrically connected and arranged to form a gap between the metal battery cases,
The metal battery case is a rectangular metal case having a triazine dithiol dielectric film formed on the outer surface;
A protective film disposed on the outer surface of the metal case;
A power storage device comprising: a resin portion integrally molded to cover an edge of the protective film on an outer surface exposed from the protective film of the metal case. A method of manufacturing a rectangular metal battery case that houses a storage element and constitutes a storage cell,
A process of pressing a metal plate to form a rectangular metal case;
A surface treatment step of forming irregularities on the outer surface of the metal case;
And a molding step of integrally molding a resin part on the outer surface by insert molding the metal case.   The method of manufacturing a metal battery case according to claim 17, wherein the unevenness of the outer surface of the metal case is a nanometer level unevenness.   The method for producing a metal battery case according to claim 18, wherein the unevenness at the nanometer level is formed by a dipping process in which the unevenness is formed in an uneven surface forming liquid. A method of manufacturing a rectangular metal battery case that houses a storage element and constitutes a storage cell,
A process of pressing a metal plate to form a rectangular metal case;
A surface treatment step of forming a film of triazinedithiol dielectric on the outer surface of the metal case;
And a molding step of integrally molding a resin part on the outer surface by insert molding the metal case. A method of manufacturing a rectangular metal battery case that houses a storage element and constitutes a storage cell,
A process of pressing a metal plate to form a rectangular metal case;
A surface treatment step of forming irregularities on the outer surface of the metal case;
A film temporary fixing step of temporarily fixing a protective film at a predetermined position on the outer surface of the metal case;
A molding step in which the metal case is insert-molded, and a resin portion is integrally molded on an outer surface exposed from the protective film of the metal case so as to cover an edge portion of the protective film. A method for producing a metal battery case.   The method of manufacturing a metal battery case according to claim 21, wherein the irregularities on the outer surface of the metal case are nanometer-level irregularities.   23. The method for producing a metal battery case according to claim 22, wherein the nanometer level unevenness is formed by an immersion process of immersing in an uneven surface forming liquid. A method of manufacturing a rectangular metal battery case that houses a storage element and constitutes a storage cell,
A process of pressing a metal plate to form a rectangular metal case;
A surface treatment step of forming a film of triazinedithiol dielectric on the outer surface of the metal case;
A film temporary fixing step of temporarily fixing a protective film at a predetermined position on the outer surface of the metal case;
A molding step in which the metal case is insert-molded, and a resin portion is integrally molded on an outer surface exposed from the protective film of the metal case so as to cover an edge portion of the protective film. A method for producing a metal battery case.

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