JP4640622B2 - Power storage device and metal battery case manufacturing method - Google Patents

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) housed in a rectangular metal battery case (for example, 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 stacked , and the metal battery case has a rectangular metal case (for example, an uneven surface formed on the entire outer surface ) (for example, The metal case 17 in the embodiment, and a rib-like resin portion (for example, in the embodiment) integrally molded on the outer surface of the long side surface of the metal case (for example, the outer surface 18 in the embodiment) The resin parts 19) are provided, and both resin parts of the metal battery cases disposed adjacent to each other are in close contact to form a gap between the metal battery cases.

In the invention described in claim 2 , in addition to the configuration of the invention described in claim 1 , the rib-shaped resin portion integrally injection-molded on the outer surface of the metal case is a short side surface of the metal battery case (for example, short side surface 21) and a bottom surface in the embodiment (e.g., wherein the well is formed in at least one of the bottom surface 22) in the embodiment.

Invention of claim 3, in addition to the configuration of the invention according to claim 1, the resin portion, the resin portion of both of the metal the container is stacked adjacently is closely columnar structure It is characterized by constituting the body.

The invention according to claim 4, in addition to the configuration of the invention according to any one of claims 1 to 3, the resin portion, at least one pair of recesses (e.g., recess 26 in the embodiment) and the convex portion (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 according to claim 5 is a power storage device in which a plurality of power storage cells each storing a power storage element in a rectangular metal battery case are electrically connected and arranged in layers , the metal battery case comprising a triazine A rectangular metal case having a dithiol dielectric film formed on the outer surface , and a rib-shaped resin portion integrally injection-molded on the outer surface of the long side surface of the metal case, which are adjacently stacked. Both resin parts of the metal battery case are in close contact, and a gap is formed between the metal battery cases.

The invention according to claim 6 is a power storage device in which a plurality of power storage cells each storing a power storage element in a rectangular metal battery case are electrically connected and arranged in a stacked manner. Protective film (for example, protective film 41 in the embodiment) in which a rectangular metal case having irregularities formed on the entire surface and a plurality of slit holes arranged on the outer surface of the long side surface of the metal case are formed. ) And a rib-shaped resin portion integrally molded so as to cover the edge of the slit hole of the protective film on the outer surface exposed from the slit hole of the protective film of the metal case, and laminated adjacently Both the resin parts of the metal battery case are closely contacted to form a gap between the metal battery cases.

In the invention described in claim 7 , in addition to the configuration of the invention described in claim 6 , a rib-shaped resin portion integrally molded is formed on at least one of the short side surface and the bottom surface of the metal battery case. It is characterized by that.

According to an eighth aspect of the present invention, in addition to the structure of the sixth 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, When stacked, a columnar structure is formed.

The invention according to claim 9, in addition to the configuration of the invention according to any one of claims 6-8, the resin part comprises at least one pair of concave portions and convex portions were stacked a plurality of storage cells 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 according to claim 10 is a power storage device in which a plurality of power storage cells each storing a power storage element in a rectangular metal battery case are electrically connected and stacked , and the metal battery case is a triazine and prismatic metal case forming a film of dithiol dielectric on the outer surface, and a protective film in which a plurality of slits holes arranged on the outer surface of the long sides of the metal case is formed, the slits of the protective film of the metal case Rib-shaped resin part integrally molded so as to cover the edge of the slit hole of the protective film on the outer surface exposed from the hole , and both resin parts of the metal battery case disposed adjacent to each other Are closely connected to form a gap between the metal battery cases.

Invention of Claim 11 is a manufacturing method of the square-shaped metal battery case which accommodates an electrical storage element and comprises an electrical storage cell, Comprising: The process which presses a metal plate and forms a square-shaped metal case And a surface treatment process for forming irregularities on the entire outer surface of the metal case, and a molding process for integrally molding the rib-shaped resin portion on the outer surface of the long side surface of the metal case by insert molding. It is characterized by providing.

The invention according to claim 12 is a method of manufacturing a rectangular metal battery case that houses a storage element and constitutes a storage cell, wherein the metal plate is pressed to form a rectangular 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 integrally forming the rib-shaped resin portion on the outer surface of the long side surface of the metal case by insert molding of the metal case And.

The invention according to claim 13 is a method for 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. A surface treatment step for forming irregularities on the entire outer surface of the metal case, a film temporary fixing step for temporarily fixing a protective film having a plurality of slit holes formed on the outer surface of the long side surface of the metal case, and a metal And a molding step in which a case is insert-molded, and a rib-shaped resin part is integrally formed on an outer surface exposed from the slit hole of the protective film of the metal case so as to cover the edge of the slit hole of the protective film. It is characterized by.

The invention according to claim 14 is a method of manufacturing a rectangular metal battery case that houses a storage element and constitutes a storage cell, wherein the metal plate is pressed to form a rectangular metal case And a surface treatment process for forming a film of a triazine dithiol dielectric on the outer surface of the metal case, and a film temporary fixing process for temporarily fixing a protective film having a plurality of slit holes formed on the outer surface of the long side surface of the metal case And a molding step of integrally molding a rib-shaped resin portion so as to cover the edge of the slit hole of the protective film on the outer surface exposed from the slit hole of the protective film of the metal case by insert molding the metal case; It is characterized by providing.

  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.

Moreover , since the mechanical strength of the long side surface of the metal battery case can be improved, deformation of the long side surface of the metal battery case due to the internal pressure of the 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 the second aspect, 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 third 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 fourth aspect , since a 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 sixth 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.
Moreover, since the mechanical strength of the long side surface of the metal battery case can be improved, deformation of the long side surface of the metal battery case due to the internal pressure of the 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 7 , 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 eighth 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 ninth aspect , since a 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 eleventh aspect , it is possible to easily manufacture the 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 13 , 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 any gaps. 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, a deep drawing process is performed on a thin plate such as aluminum to form a bottomed rectangular parallelepiped box shape, 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, a metal case 17 having a special surface treatment applied to the outer surface 18 is insert-molded by a normal injection molding machine, and ribs 23, which are 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 secular change etc., the protective film 41 will not peel to the metal case 17 without peeling. 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 (14)

A power storage device in which a plurality of power storage cells that store power storage elements in a rectangular metal battery case are electrically connected and stacked ,
The metal battery case is a rectangular metal case with irregularities formed on the entire outer surface;
A rib-shaped resin part integrally injection-molded on the outer surface of the long side surface of the metal case,
The power storage device , wherein the resin parts of both of the metal battery cases disposed adjacent to each other are in close contact to form a gap between the metal battery cases. The rib-like resin portion integrally injection-molded on the outer surface of the metal case, the power storage device according to claim 1, characterized in that it is also formed on at least one short side and bottom surfaces of the metal battery case . 2. The power storage device according to claim 1, wherein the resin portion forms a columnar structure by closely contacting the resin portions of both of the metal battery cases that are adjacently stacked . 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 or 3, characterized in that the relative position is positioned. A power storage device in which a plurality of power storage cells that store power storage elements in a rectangular metal battery case are electrically connected and stacked ,
The metal battery case is a rectangular metal case having a triazine dithiol dielectric film formed on the outer surface;
A rib-shaped resin part integrally injection-molded on the outer surface of the long side surface of the metal case,
The power storage device , wherein the resin parts of both of the metal battery cases disposed adjacent to each other are in close contact to form a gap between the metal battery cases. A power storage device in which a plurality of power storage cells that store power storage elements in a rectangular metal battery case are electrically connected and stacked ,
The metal battery case is a rectangular metal case with irregularities formed on the entire outer surface;
A protective film formed with a plurality of slit holes arranged on the outer surface of the long side surface of the metal case;
Rib-shaped resin part integrally molded to cover the edge of the slit hole of the protective film on the outer surface exposed from the slit hole of the protective film of the metal case,
The power storage device , wherein the resin parts of both of the metal battery cases disposed adjacent to each other are in close contact to form a gap between the metal battery cases. The power storage device according to claim 6 wherein at least one even short side surface and a bottom surface of the metal battery case, wherein the integral resin part of the injection molded rib-shaped is formed. The power storage device according to claim 6 , wherein the resin portion forms a columnar structure by closely contacting the resin portions of both of the metal battery cases that are adjacently stacked . 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 6 , wherein a relative position is positioned. A power storage device in which a plurality of power storage cells that store power storage elements in a rectangular metal battery case are electrically connected and stacked ,
The metal battery case is a rectangular metal case having a triazine dithiol dielectric film formed on the outer surface;
A protective film formed with a plurality of slit holes arranged on the outer surface of the long side surface of the metal case;
Rib-shaped resin part integrally molded to cover the edge of the slit hole of the protective film on the outer surface exposed from the slit hole of the protective film of the metal case,
The power storage device , wherein the resin parts of both of the metal battery cases disposed adjacent to each other are in close contact to form a gap between the metal battery cases. 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 entire outer surface of the metal case;
A molding step in which the metal case is insert-molded to integrally mold a rib-shaped resin portion on the outer surface of the long side surface of the metal case;
The manufacturing method of the metal battery case characterized by including. 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 molding step in which the metal case is insert-molded to integrally mold a rib-shaped resin portion on the outer surface of the long side surface of the metal case;
The manufacturing method of the metal battery case characterized by including. 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 entire outer surface of the metal case;
A film temporary fixing step of temporarily fixing a protective film having a plurality of slit holes formed on the outer surface of the long side surface of the metal case;
A molding process in which the metal case is insert-molded, and a rib-shaped resin portion is integrally molded on the outer surface exposed from the slit hole of the protective film of the metal case so as to cover the edge of the slit hole of the protective film. And a method of manufacturing a metal battery 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 a film of triazinedithiol dielectric on the outer surface of the metal case;
A film temporary fixing step of temporarily fixing a protective film having a plurality of slit holes formed on the outer surface of the long side surface of the metal case;
A molding process in which the metal case is insert-molded, and a rib-shaped resin portion is integrally molded on the outer surface exposed from the slit hole of the protective film of the metal case so as to cover the edge of the slit hole of the protective film. And a method of manufacturing a metal battery case.

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