JP4692853B2 - 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 13 in the embodiment) housed in a square metal battery case (for example, is storage cells 11) in the embodiment, an arranged power storage device so as to form a gap between the metal battery case is electrically connected, the metal battery case is fine irregularities are formed the outer surface (e.g., outer surface 20 in the embodiment) rectangular metal case which have a (e.g., a metal case 19 in the embodiment) arranged plurality of alignment, integrally with the insert molded resin coupled with the metal battery case assembly (e.g., a metal battery case assembly 14 in the embodiment) constitutes a metal battery case assembly, the resin formed during insert molding the outer surface of the metal case a rib It is characterized by providing.

In the invention described in claim 2, in addition to the configuration of the invention described in claim 1, the rib (for example, the rib 26 in the embodiment) is provided on the long side surface of the metal battery case (for example, in the embodiment). It characterized in that it is formed on the long side surface 21).

In the invention described in claim 3, in addition to the configuration of the invention described in claim 2, the rib (for example, the rib 27 in the embodiment) further includes a short side surface (for example, the embodiment ) of the metal battery case. short side surface 22) and the bottom surface (e.g., a characterized in that it is formed in at least one of the bottom surface 23) in the embodiment.

In the invention according to claim 4, in addition to the configuration of the invention according to claim 2, the rib formed on the long side surface of the metal battery case has a columnar shape when a plurality of metal battery case assemblies are stacked and arranged. It constitutes a structure.

In the invention described in claim 5, in addition to the configuration of the invention described in any one of claims 1 to 4, the rib formed on the long side surface of the metal battery case has at least one set of recesses (for example, implementation). A concave portion 29 in the form and a convex portion (for example, the convex portion 28 in the embodiment), and when the plurality of metal battery case assemblies are stacked, the concave portions of the adjacent metal battery case The convex portions are fitted to each other, and the relative position of the metal battery case assembly is positioned.

  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.

The invention according to claim 8, power storage in which a plurality of storage cells containing the storage element into a square with a metal collector tank is arranged to form a gap in the metal battery case between are electrically connected an apparatus, metal battery case is disposed plurality of alignment of the prismatic metal casing which have the outer surface coating of triazine-thiol dielectric is formed, is integrally coupled with the insert molded resin-metal The battery case assembly is configured, and the metal case case includes a rib of resin formed on the outer surface of the metal case at the time of insert molding .

The invention according to claim 9, power storage in which a plurality of storage cells containing the storage element into a square with a metal collector tank is arranged to form a gap in the metal battery case between are electrically connected an apparatus, metal battery case is disposed plurality of alignment of the prismatic metal casing which have the outer surface in which fine irregularities are formed, a metal battery container set are integrally coupled with the insert molded resin constitute the body, the metal battery case assembly, and the protective film in which a plurality of slits holes arranged on the outer surface formed in the metal case (e.g., the protective film 41 in the embodiment), the protective film of the metal case A resin rib formed at the time of insert molding on the outer surface exposed from the slit hole , and the rib is formed so as to cover the edge of the slit hole of the protective film .

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

The invention described in claim 11 is characterized in that, in addition to the configuration of the invention described in claim 10, the rib is further formed on at least one of the short side surface and the bottom surface of the metal battery case .

In the invention described in claim 12, in addition to the configuration of the invention described in claim 10, the rib formed on the long side surface of the metal battery case has a columnar shape when a plurality of metal battery case assemblies are stacked. It constitutes a structure.

According to a thirteenth aspect of the present invention, in addition to the configuration of the invention according to any one of the ninth to twelfth aspects, the rib formed on the long side surface of the metal battery case includes at least one set of a concave portion and a convex portion. In addition, when a plurality of metal battery case assemblies are stacked, the concave and convex portions of adjacent metal battery case assemblies are fitted to each other, and the relative positions of the metal battery case assemblies 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.

The invention according to claim 16, power storage in which a plurality of storage cells containing the storage element into a square with a metal collector tank is arranged to form a gap in the metal battery case between are electrically connected an apparatus, metal battery case is disposed plurality of alignment of the prismatic metal casing which have the outer surface coating of triazine-thiol dielectric is formed, is integrally coupled with the insert molded resin-metal The battery case assembly is composed of a protective film having a plurality of slit holes arranged on the outer surface of the metal case and an outer surface exposed from the slit holes of the protective film of the metal case. And a resin rib formed at the time of insert molding , wherein the rib is formed so as to cover the edge of the slit hole of the protective film .

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 When a surface treatment step of forming fine irregularities on the outer surface of the metal case, with the resin by insert molding a plurality of the metal case is bonded together with a resin into a plurality of metal case aligned arrangement, the outer metal casing And a molding step of integrally molding a resin rib on the 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 When a surface treatment step of forming a film of the triazine dithiol dielectric on the outer surface of the metal case, with the resin by insert molding a plurality of the metal case is bonded together with a resin to a plurality of the metal case was aligned, metal And a molding step of integrally molding a resin rib on the outer surface of the case .

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 fine irregularities on the outer surface of the metal case, a film temporary fixing process for temporarily fixing a protective film having a plurality of slit holes at predetermined positions on the outer surface of the metal case, and alignment Resin insert molding to multiple placed metal cases and integrally bond the multiple metal cases with resin, and at the outer surface exposed from the slit hole of the protective film of the metal case, the edge of the slit hole of the protective film And a molding step of integrally molding resin ribs so as to cover.

  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 And a surface treatment process for forming a film of 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 at predetermined positions on the outer surface of the metal case The resin is insert-molded into a plurality of aligned metal cases and the plurality of metal cases are integrally bonded with the resin, and the slit holes of the protective film are formed on the outer surface exposed from the slit holes of the protective film of the metal case . And a molding step of integrally molding a resin rib so as to cover the edge.

According to the power storage device of claim 1, the metal battery case assembly includes a plurality of metal cases having an outer surface on which fine irregularities are formed, arranged between the outer surfaces of the plurality of metal cases by insert molding. Are integrally bonded with resin , so that a metal battery case assembly in which a plurality of metal cases are firmly bonded can be obtained. Moreover, since the resin rib is formed on the outer surface of the metal case, the rib can be firmly fixed to the outer surface of the metal case.

  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 metal battery case assemblies 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 metal battery case assemblies 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 metal battery case assemblies 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 claim 9, since the entire outer surface of the plurality of metal cases of the metal battery case assembly can be covered with the protective film and the resin rib without gaps, the power storage cell is electrically and mechanically Can be protected. In addition, since the rib 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 that fixes the protective film to the outer surface of the metal case deteriorates due to secular change, The protective film can be reliably 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 metal battery case assemblies 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 thirteenth aspect, since the plurality of metal battery case assemblies 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 metal battery case assemblies 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.

The metal battery case according to claim 17, wherein the resin ribs are firmly fixed to the outer surface of the metal case, and a plurality of adjacent metal cases are firmly bonded by the resin . Aggregates can be easily manufactured.

According to the metal battery case manufacturing method of claim 21, the resin rib 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 rib without a gap, In addition, it is possible to easily manufacture a metal battery case assembly in which a plurality of adjacent metal cases are firmly bonded with resin .

  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. 1-6, 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 6, in the power storage device 10 of the present embodiment, for example, power storage cell modules 12 in which four power storage cells 11 such as lithium batteries are linearly and integrally connected are stacked in four stages. Configured. In other words, the power storage device 10 includes 16 power storage cells 11.

  As shown in FIGS. 3 and 4, the storage cell module 12 mainly includes a metal battery case assembly 14 in which four rectangular metal battery cases 13 having a rectangular parallelepiped outer shape are integrally joined in a straight line, The positive electrode terminal 15 and the negative electrode terminal 16 are electrically connected to each other, and a storage element (not shown) that is accommodated in each metal battery case 13 and a lid portion 17 that closes the upper opening of each metal battery case 13 are provided. . In addition, as shown in FIG. 5, the four storage cells 11 are arranged so that the positive electrode terminals 15 and the negative electrode terminals 16 are alternately arranged. The members 31 are electrically connected.

  The lid portion 17 is exposed to the positive electrode terminal 15 and the negative electrode terminal 16 to the outside, and is joined to the upper opening of the metal battery case 13, in order to discharge the gas generated in the storage cell 11 at a substantially central portion thereof. Gas exhaust valve 18 is provided.

  As shown in FIGS. 2 and 3, the metal battery case assembly 14 is adjacent to four metal cases 19 arranged in a straight line, and a resin portion 24 formed on the outer surface 20 of the metal case 19. A connecting portion 25 for connecting the short side surfaces 22 of the four metal cases 19. The resin portion 24 and the coupling portion 25 are formed by insert-molding four metal cases 19. Further, as shown in FIG. 1, the metal case 19 is formed by pressing a thin plate such as aluminum or copper-based metal into a bottomed rectangular parallelepiped box shape.

  In this embodiment, the outer surface 20 of the metal case 19 is subjected to a special surface treatment prior to injection molding, and has nanometer level (20 nm to 30 nm) ultra-fine irregularities. The special surface treatment such as aluminum or copper metal will be described later.

  The resin portion 24 is formed by insert molding a synthetic resin such as PBT resin or PPS resin into the metal case 19 with a normal injection molding device, and is formed longitudinally on the long side surface 21 of the metal case 19. A plurality of ribs 26 and a plurality of ribs 27 formed transversely and longitudinally on the short side surface 22 and the bottom surface 23 of the metal case 19.

  The ribs 26 are respectively formed with cylindrical convex portions 28 on the upper left and right sides of the metal battery case 13 and circular concave portions 29 on the lower left and right sides. A convex portion 28 is also formed at the upper left corner of the resin portion 24 of the metal battery case 13 at the left end of the metal battery assembly 14 and at the lower right corner of the resin portion 24 of the metal case 13 at the right end. A recess 29 is also formed in the lower left corner of the resin portion 24 of the metal battery case 13 at the left end of the metal battery assembly 14 and the upper right corner of the resin portion 24 of the metal battery case 13 at the right end. Further, on the back surface side of the metal battery case 13, a concave portion 29 is formed at a position corresponding to the convex portion 28 on the front surface side, and a convex portion 28 is formed at a position corresponding to the concave portion 29 on the front surface side. The rib 27 is formed with a pair of cylindrical protrusions 30.

  As shown in FIG. 3 (c), the coupling portion 25 integrally couples the short side surfaces 22 of the four metal cases 19 arranged in alignment, and has a cylindrical convex at the lower end portion on the surface side. Each of the portions 28 is formed, and a circular concave portion 29 is formed at the upper end portion on the surface side. Further, on the back surface side of the coupling portion 25, a concave portion 29 is formed at a position corresponding to the convex portion 28 on the front surface side, and a convex portion 28 is formed at a position corresponding to the concave portion 29 on the front surface side.

  The outer diameter of the convex portion 28 and the inner diameter of the concave portion 29 can be fitted with the same size, and when the four-stage storage cell module 12 is stacked, the convex portion 28 and the concave portion 29 are fitted to each other, The relative positions of the adjacent four-stage power storage cell modules 12 are positioned.

  In the present embodiment, as shown in FIG. 6, the four-stage storage cell modules 12 are arranged so that the positive electrode terminals 15 and the negative electrode terminals 16 are alternately arranged, and the convex portions 28 of the adjacent storage cell modules 12 The concave portions 29 are stacked while being positioned. At this time, the ribs 26 and 27 of the metal battery case assembly 14 are in close contact with each other to form a columnar structure, thereby increasing the rigidity of the entire power storage device 10.

  Further, in the present embodiment, as shown in FIG. 6, high-rigidity pressure plates 32 are arranged at both ends on the long side surface 21 side of the storage cell module 12 stacked in four stages. In addition, constraining plates 33 in which engagement holes 34 are formed at regular intervals are arranged on both surfaces of the stacked storage cell module 12 on the short side surface 22 side, and the engagement holes 34 are fitted into the convex portions 30 of the ribs 27. The both ends of the restraint plate 33 are fixed to the pressure plate 32, and the stacked power storage cell modules 12 are fixed integrally. And the electrical storage apparatus 10 is completed by electrically connecting the positive electrode terminal 15 and the negative electrode terminal 16 of the both ends of the electrical storage cell module 12 with the electrically-conductive member 31. FIG.

  In the power storage device 10 configured as described above, the cooling medium passage 35 defined by the rib 26 and the long side surface 21 of the power storage cell 11 is formed between the adjacent power storage cell modules 12 (power storage cells 11). By circulating cooling air or the like through the cooling medium passage 35, 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. Is done.

  Next, the manufacturing method of the metal battery case assembly 14 (metal battery case 13) will be described. First, as shown in FIG. 1, a thin plate such as aluminum is deep-drawn to form a bottomed rectangular parallelepiped box, and a metal case 19 is manufactured (processing step). Next, a special surface treatment is performed on the outer surface 20 of the metal case 19 to form nanometer-level ultra-fine irregularities (surface treatment step). Then, as shown in FIG. 2, the four metal cases 19 with the special surface treatment applied to the outer surface 20 are arranged in a straight line, insert-molded by a normal injection molding machine, and shown in FIG. As described above, the short side surfaces 22 of the four adjacent metal cases 19 are coupled by the coupling portion 25, and the long side surface 21, the short side surface 22, and the bottom surface 23 are bonded to the ribs 26 and 27 that are the resin portions 24, and the convex portion. 28 and 30 and the recessed part 29 are formed (molding process). Thereby, for example, the synthetic resin enters the dimples having a diameter of 20 to 300 nm formed on the outer surface 20 by the special surface treatment to form the resin portion 24 and the coupling portion 25, and the resin portion 24 and the coupling portion 25 are strong. The metal battery case assembly 14 fixed to the outer surface 20 is manufactured.

  As the special surface treatment of the present embodiment, 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 is used. Organic plating for forming a film of triazinedithiol dielectric on the metal surface by performing organic plating treatment with a triazinedithiol dielectric on the outer surface 18 of the metal case 17 in an electrolytic cell containing an electrolytic solution dissolved in water or an organic solution Film treatment is applied.

  And after storing the electrical storage element not shown in each metal battery case 13, injecting electrolyte solution and impregnating the electrical storage element, as shown in FIG. The lid 17 is airtightly joined to the battery cell module 12.

  As described above, according to the power storage device 10 of the present embodiment, the metal battery case assembly 14 includes the four metal cases 19 having the outer surface 20 formed with the nanometer level unevenness arranged in an aligned manner. Since the outer surfaces 20 of the four metal cases 19 are integrally coupled by the coupling portion 25 by molding, the metal battery case assembly 14 in which the four metal cases 19 are firmly coupled can be obtained. Further, since the resin portion 24 is formed on the outer surface 20 of the metal case 19, the resin portion 24 can be firmly fixed to the outer surface 20 of the metal case 19.

  Moreover, according to the electrical storage apparatus 10 of this embodiment, since the resin part 24 is the rib 26 formed in the long side surface 21 of the metal battery case 13, the mechanical strength of the long side surface 21 of the metal battery case 13 is improved. Therefore, the deformation of the long side surface 21 of the metal battery case 13 due to the internal pressure of the storage cell 11 can be prevented. Further, since the cooling medium passage 35 for allowing cooling air or the like to flow between the adjacent storage cells 11 can be formed by the ribs 26, 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. Further, since it is not necessary to separately prepare a member for forming the cooling medium passage 35, the number of parts 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.

  Further, according to the power storage device 10 of the present embodiment, the resin portion 24 is the rib 27 formed on the short side surface 22 and the bottom surface 23 of the metal battery case 13, and thus the short side surface 22 and the bottom surface 23 of the metal battery case 13. Therefore, the deformation of the short side surface 22 and the bottom surface 23 of the metal battery case 13 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 24 is the rib 27 formed on the short side surface 22 and the bottom surface 23 of the metal battery case 13, and the four-stage metal battery case assemblies 14 are arranged in a stacked manner. In this case, since the columnar structure is configured, the four-stage metal battery case assembly 14 can be assembled integrally, so that the rigidity of the entire power storage device 10 can be increased.

  Further, according to the power storage device 10 of the present embodiment, the resin portion 24 includes at least one set of the concave portion 29 and the convex portion 28, and when the four-stage metal battery case assembly 14 is laminated, Since the concave portion 29 and the convex portion 28 of the tank assembly 14 are fitted to each other and the relative position of the metal battery case assembly 14 is positioned, the four-stage metal battery case assembly 14 can be easily stacked and arranged. Since it can do, the assembly | attachment property of the electrical storage apparatus 10 can be improved. In addition, since the assembly rigidity of the four-stage metal battery case assembly 14 can be increased, it is possible to improve the reliability and safety of the power storage device 10 that is used under severe use conditions such as for vehicle mounting. .

  In addition, according to the method for manufacturing the metal battery case 13 of the present embodiment, the processing step of pressing the metal plate to form the square metal case 19, and the nanometer level unevenness on the outer surface 20 of the metal case 19 In order to provide a surface treatment process to be formed and a molding process in which the four metal cases 19 arranged in an aligned manner are insert-molded and integrally joined by the coupling portion 25, and the resin portion 24 is integrally molded on the outer surface 20, It is possible to easily manufacture the metal battery case assembly 14 in which the resin part 24 is firmly fixed to the outer surface 20 of the metal case 19 and the four adjacent metal cases 19 are firmly joined by the joining part 25. it can.

(Second Embodiment)
Next, with reference to FIGS. 7-9, 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 the present 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 and the coupling portion are injection molded. Parts are denoted by the same or corresponding reference numerals, and the description thereof is simplified or omitted.

  As shown in FIGS. 7 to 9, the metal battery case 40 of the present embodiment has an outer surface 20 on which irregularities of nanometer level are formed as in the first embodiment, and is arranged in a straight line. A metal battery case assembly 45 formed by insert molding of four metal cases 19 (see FIG. 1) is configured, and the metal battery case assembly 45 is a joint portion that integrally connects the four metal cases 19 25, the protective film 41 temporarily fixed to the long side surface 21 of the metal case 19 with an adhesive or an adhesive tape, and the outer surface 20 exposed from the protective film 41 of the metal case 19 covers the edge of the protective film 41 And a resin portion 24 formed as described above.

  The protective film 41 has an insulating property, is approximately the same size as the long side surface 21, and covers almost the entire surface of the long side surface 21. The protective film 41 is formed with a plurality of (13 in the present embodiment) slit holes 42 in a direction perpendicular to the long side surface 21, and the long side surface 21 of the metal case 19 is exposed from the slit hole 42. is doing. The protective film 41 may be disposed not only on the long side surface 21 of the metal case 19 but also on the short side surface 22 and the bottom surface 23 as necessary.

  Next, the manufacturing method of the metal battery case assembly 45 (metal battery case 40) will be described. First, as shown in FIG. 1, a thin plate such as aluminum is deep-drawn to form a bottomed rectangular parallelepiped box, and a metal case 19 is manufactured (processing step). Next, a special surface treatment is performed on the outer surface 20 of the metal case 19 to form nanometer-level ultra-fine irregularities (surface treatment step). Next, as shown in FIG. 7, the protective film 41 is temporarily fixed to the long side surface 21 of the metal case 19 with an adhesive or an adhesive tape (film temporary fixing step). Then, as shown in FIG. 8, the four metal cases 19 having the protective film 41 temporarily fixed on the long side surface 21 are arranged in a straight line, and are insert-molded by a normal injection molding machine. As shown in the figure, the short side surfaces 22 of the four adjacent metal cases 19 are coupled by the coupling portion 25, and the long side surface 21, the short side surface 22, and the bottom surface 23 are bonded to the ribs 26 and 27 that are the resin portions 24, The portions 28 and 30 and the recess 29 are formed (molding process). As a result, as shown in FIG. 9B, the synthetic resin enters the dimples having a diameter of 20 to 300 nm, for example, formed on the outer surface 20 exposed from the slit hole 42 of the protective film 41, and the resin portion 24 and the bonding portion. By forming the portion 25, the metal battery case assembly 45 in which the resin portion 24 and the coupling portion 25 are firmly fixed to the outer surface 20 is manufactured. Moreover, since the resin part 24 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 19. Securely fixed.

  As described above, according to the power storage device 10 of the present embodiment, the metal battery case 40 has the outer surface 20 on which the nanometer level unevenness is formed, and inserts the four metal cases 19 arranged in alignment. A metal battery case assembly 45 formed by molding is configured, and the metal battery case assembly 45 is disposed on the outer surface 20 of the metal case 19 and a coupling portion 25 that integrally couples the four metal cases 19. A protective film 41 and a resin portion 24 formed on the outer surface 20 exposed from the slit hole 42 of the protective film 41 of the metal case 19 so as to cover the edge of the slit hole 42 of the protective film 41. Since all the outer surfaces 20 of the four metal cases 19 of the metal battery case assembly 45 can be covered with the protective film 41 and the resin part 24 without gaps, the storage cell 11 is protected electrically and mechanically. It can be. Moreover, since the resin part 24 is firmly fixed to the outer surface 20 of the metal case 19 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 20 of the metal case 19. Even if the adhesive or the like deteriorates due to aging, the protective film 41 can be reliably fixed to the metal case 19 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 metal plate 19 is pressed to form the square metal case 19 and the outer surface 20 of the metal case 19 has nanometer level unevenness. 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 20 of the metal case 19, and four aligned metal cases 19 are insert-molded and joined together. A molding step of integrally molding the resin portion 24 on the outer surface 20 exposed from the slit hole 42 of the protective film 41 of the metal case 19 so as to cover the edge of the slit hole 42 of the protective film 41. The portion 24 is firmly fixed to the outer surface 20 of the metal case 19, and the entire outer surface 20 of the metal case 19 is covered with the protective film 41 and the resin portion 24 without any gaps. And can be four metal casing 19 adjacent to easily manufacture a metal battery case assembly 45 which is firmly coupled by the coupling portion 25.
About another structure and an effect, it is the same as that of the said 1st Embodiment.

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. 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 perspective view for demonstrating the state which arranged and arrange | positioned the metal case shown in FIG. 1 linearly. 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 assembly, (b) is the sectional view on the AA line of (a), (C) is a BB arrow directional cross-sectional view of (a). It is a perspective view of the electrical storage cell module of 1st Embodiment of the electrical storage apparatus which concerns on this invention. It is a perspective view for demonstrating the state which connected the positive electrode terminal and negative electrode terminal of the electrical storage cell module shown in FIG. 4 with the electrically-conductive member. 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 C- of (a). FIG. FIG. 8 is a perspective view for explaining a state in which the metal cases shown in FIG. 7 are arranged in a straight line. It is a figure for demonstrating the metal battery case of 2nd Embodiment, (a) is a perspective view of a metal battery case assembly, (b) is DD sectional view taken on the line of (a).

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Power storage device 11 Power storage cell 12 Power storage cell module 13 Metal battery case 14 Metal battery case assembly 19 Metal case 20 Outer surface 21 Long side surface 22 Short side surface 23 Bottom surface 24 Resin part 25 Coupling part 26 Rib (resin part)
27 Rib (resin part)
28 Convex part 29 Concave part 30 Convex part 35 Cooling medium passage (gap)
40 Metal battery case 41 Protective film 42 Slit hole 45 Metal battery case assembly

Claims (24)

A plurality of storage cells containing the storage element into a square with a metal collector tank is an arranged power storage device so as to form a gap between the metal battery case is electrically connected,
It said metal battery case is disposed plurality of alignment of the prismatic metal casing which have the outer surface in which fine irregularities are formed, is integrally coupled to constitute a metal battery case assembly by insert molded resin ,
It said metal battery case assembly, power storage device, characterized in that it comprises a rib of the resin formed during insert molding the outer surface of the metal case. The ribs, power storage device according to claim 1, characterized in that formed on the long side surface of the metal battery case. The ribs further power storage device according to claim 2, characterized in that formed on at least one short side and bottom surfaces of the metal battery case. 3. The power storage device according to claim 2, wherein the rib formed on the long side surface of the metal battery case forms a columnar structure when a plurality of the metal battery case assemblies are stacked and arranged. The rib formed on the long side surface of the metal battery case includes at least one set of recesses and protrusions, and when the plurality of metal battery case assemblies are stacked, the recesses of the adjacent metal battery case assemblies 5. The power storage device according to claim 4 , wherein the convex portions are fitted to each other, and the relative position of the metal battery case assembly 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 storage cells containing the storage element into a square with a metal collector tank is an arranged power storage device so as to form a gap between the metal battery case is electrically connected,
It said metal battery case is disposed plurality of alignment of the prismatic metal casing which have the outer surface coating of triazine-thiol dielectric is formed, integrally coupled with the insert molded resin metal battery case assembly Configure
It said metal battery case assembly, power storage device, characterized in that it comprises a rib of the resin formed during insert molding the outer surface of the metal case. A plurality of storage cells containing the storage element into a square with a metal collector tank is an arranged power storage device so as to form a gap between the metal battery case is electrically connected,
It said metal battery case is disposed plurality of alignment of the prismatic metal casing which have the outer surface in which fine irregularities are formed, is integrally coupled to constitute a metal battery case assembly by insert molded resin ,
It said metal battery case assembly, formed a protective film in which a plurality of slits holes arranged on the outer surface of the metal case is formed, at the time of insert molding the outer surface which is exposed from the slit hole of the protective film of the metallic base And a rib for the resin , wherein the rib is formed so as to cover an edge of a slit hole of the protective film . The ribs, power storage device according to claim 9, characterized in that formed on the long side surface of the metal battery case. The ribs further power storage device according to claim 10, characterized in that formed on at least one short side and bottom surfaces of the metal battery case. 11. The power storage device according to claim 10, wherein the rib formed on the long side surface of the metal battery case forms a columnar structure when a plurality of the metal battery case assemblies are stacked and arranged. The rib formed on the long side surface of the metal battery case includes at least one set of recesses and protrusions, and when the plurality of metal battery case assemblies are stacked, the recesses of the adjacent metal battery case assemblies The power storage device according to claim 12, wherein the convex portions are fitted to each other, and the relative position of the metal battery case assembly is positioned.   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 storage cells containing the storage element into a square with a metal collector tank is an arranged power storage device so as to form a gap between the metal battery case is electrically connected,
It said metal battery case is disposed plurality of alignment of the prismatic metal casing which have the outer surface coating of triazine-thiol dielectric is formed, integrally coupled with the insert molded resin metal battery case assembly Configure
The metal battery case assembly is formed at the time of insert molding on a protective film formed with a plurality of slit holes arranged on the outer surface of the metal case and an outer surface exposed from the slit holes of the protective film of the metal case. And a rib for the resin , wherein the rib is formed so as to cover an edge of a slit hole of the protective film . 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 fine irregularities on the outer surface of the metal case;
A molding step in which resin is insert-molded into the plurality of aligned metal cases and the plurality of metal cases are integrally coupled with the resin, and a rib of the resin is integrally molded on the outer surface of the metal case. A method for producing a metal battery case, comprising:   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;
A molding step in which resin is insert-molded into the plurality of aligned metal cases and the plurality of metal cases are integrally coupled with the resin, and a rib of the resin is integrally molded on the outer surface of the metal case. A method for producing a metal battery case, comprising: 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 fine irregularities on the outer surface of the metal case;
A film temporary fixing step for temporarily fixing a protective film in which a plurality of slit holes are formed at a predetermined position on the outer surface of the metal case;
Resin is insert-molded into the plurality of metal cases arranged in alignment, and the plurality of metal cases are integrally bonded with the resin, and the protective film is formed on the outer surface exposed from the slit holes of the protective film of the metal case. And a molding step of integrally molding the ribs of the resin so as to cover the edge of the slit hole of the 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 for temporarily fixing a protective film in which a plurality of slit holes are formed at a predetermined position on the outer surface of the metal case;
Resin is insert-molded into the plurality of metal cases arranged in alignment, and the plurality of metal cases are integrally bonded with the resin, and the protective film is formed on the outer surface exposed from the slit holes of the protective film of the metal case. And a molding step of integrally molding the ribs of the resin so as to cover the edge of the slit hole of the metal battery case.

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