JP2013020729A - Battery and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery and manufacturing method thereof in which a through hole of a battery case is sealed air-tightly and entry of metal foreign materials into the battery case is prevented.SOLUTION: The battery 1 is arranged so that a shaft part 63 is inserted into a through hole 12H of the battery case 10, a flange 52 swages a peripheral external surface 13c which is a circumference of the through hole 12H among an external surface 13 of the battery case 10, a deformed swaging piece 64 swages a peripheral inner surface 14c which is a circumference of the trough hole 12H among an inner surface 14 of the battery case 10, and a deformed blind rivet 60 which seals the through hole 12H air tightly is included. The battery 1 includes a hole inner surface protective resin member 71 provided in the through hole 12H of the battery case 10, in which the shaft part 63 of the deformed blind rivet 60 and the battery case 10 are spaced from each other via the hole inner peripheral surface protective member 71 in the through hole 12H.

Description

  The present invention relates to a battery including a battery case having a through hole communicating with the inside and the outside of the battery case and an electrode body accommodated in the battery case, wherein the through hole of the battery case is hermetically sealed.

  Conventionally, a battery case provided with a through hole such as a liquid injection hole for injecting an electrolytic solution and an electrode body accommodated in the battery case are hermetically sealed. Batteries are known. And batteries using various structures have been proposed as sealing structures for sealing the through holes. For example, Patent Document 1 discloses a sealed battery in which a sealing material is interposed between an engagement rod of a sealing member and a peripheral outer surface of a liquid injection hole (through hole), and a blind rivet is used as a sealing member. It is disclosed.

JP 2003-229118 A

  However, in the sealed battery described in Patent Document 1, when the blind rivet that is the sealing member is deformed, the rivet comes into contact with the inner peripheral surface of the through hole of the battery case, and a metal foreign object (metal piece or metal powder). There was a risk of generating. When such a metal foreign matter enters the electrode body in the battery case, there is a possibility that it may lead to problems such as a short circuit.

  The present invention has been made in view of the present situation, and is provided with a battery case made of metal and having a through hole communicating with the inside and outside of the battery case, wherein the through hole of the battery case is hermetically sealed. It is an object of the present invention to provide a battery and a method for manufacturing the same in which intrusion of metal foreign matter into the case is suppressed.

  The embodiment includes a battery case made of metal and having a through-hole communicating with the inside and outside of the battery case, an electrode body accommodated in the battery case, and a cylindrical shaft portion and a base end side of the shaft portion. A deformed rivet body including a flange portion having a diameter larger than the shaft portion and a deformed crimping portion having a diameter larger than that of the shaft portion connected to a tip side of the shaft portion, and the shaft portion is disposed in the through hole of the battery case. And the flange is caulked on the outer peripheral surface of the outer periphery of the battery case, which is the peripheral edge of the through hole, and the deformed caulking portion is in the peripheral edge of the inner surface of the battery case, which is the peripheral edge of the through hole. A battery comprising a deformed blind rivet formed by caulking the surface and hermetically sealing the through hole, and made of resin and protecting the inner peripheral surface of the battery case disposed in the through hole of the battery case A deformed blind rivet And the shaft portion, the said battery case, in the above-mentioned through hole, through the holes in the peripheral surface protection member, a cell comprising spaced apart from each other.

In this battery, a hole inner peripheral surface protection member made of resin is provided in a through hole that communicates the inside and outside of a battery case made of metal. The through hole has a shaft portion inserted into the through hole, a collar portion caulking the outer peripheral surface of the outer periphery of the battery case, which is a peripheral edge of the through hole, and a deformed caulking portion of the inner surface of the battery case. It is hermetically sealed by a deformed blind rivet in which the inner peripheral surface of the through hole is caulked.
Here, the shaft portion of the deformed blind rivet and the battery case are separated from each other through the hole inner peripheral surface protection member in the through hole.
For this reason, when an undeformed blind rivet is deformed, the rivet does not come into contact with the inner peripheral surface of the through hole of the battery case, and there is no possibility of generating a metal foreign object (metal piece or metal powder).
Therefore, the battery which suppressed that a metal foreign material penetrate | invades in a battery case is obtained.

  In addition, the hole inner peripheral surface protection member may be integrated with the battery case in the through hole or may be separated from the battery case. Moreover, the hole inner peripheral surface protection member may be arrange | positioned in the whole axial direction (thickness direction of a battery case) of a through-hole, and may be arrange | positioned in part. Moreover, the hole inner peripheral surface protection member may have a shape distributed in the circumferential direction in the through hole, or may have a cylindrical shape. The cylindrical shape is more preferable because the inside of the through hole can be reliably protected over the entire circumferential direction. Furthermore, examples of the resin that forms the hole inner peripheral surface protecting member include polyamide resins, PPS, and the like, as well as fluorine resins such as PFA, PTFE, and ETFE (tetrafluoroethylene / ethylene copolymer). A fluorine-based resin is preferable because it is stable against an electrolytic solution, has excellent heat resistance and electrical insulation, and has a small friction coefficient.

  The battery further includes an outer protective member made of resin and disposed on the outer peripheral surface of the battery case, and the flange portion of the deformed blind rivet is interposed via the outer protective member. Thus, a battery formed by crimping the outer peripheral surface of the battery case is preferable.

  In this battery, the outer protective member is disposed on the outer peripheral surface of the battery case, and the flange portion of the deformed blind rivet crimps the outer peripheral surface of the battery case via the outer protective member. Therefore, the deformed blind rivet does not directly contact the battery case even on the outer peripheral surface of the battery case. For this reason, when deform | transforming an undeformed blind rivet, generation | occurrence | production of the metal foreign material by this rivet contacting the outer peripheral surface of a battery case can also be reduced. Thereby, the battery which further suppressed the penetration | invasion into the battery case of a metal foreign material is obtained.

  In addition, the hole inner peripheral surface protection member and the outer protection member may be integrated with each other or separated. Moreover, each may be integrated with the battery case, or may be separate from the battery case. Moreover, as resin which makes an outer side protection member, fluorine-type resins, such as PFA, PTFE, ETFE, etc. other than a polyamide resin, PPS, etc. are mentioned like a hole inner peripheral surface protection member, for example.

Further, in the battery described above, the outer protective member has an annular plate shape, and the flange portion of the deformed blind rivet is connected to the outer peripheral surface of the battery case via the outer protective member. A battery in which the through hole is hermetically sealed is preferable.
In this battery, the through hole is hermetically sealed between the flange of the deformed blind rivet and the outer peripheral surface of the battery case via the outer protective member. For this reason, airtightness between the deformed blind rivet and the outer peripheral surface of the battery case can be improved as compared with the case where the outer peripheral surface of the battery case is directly caulked by the flange of the deformed blind rivet. . Thereby, the battery which improved airtightness is obtained.

Furthermore, in the battery described above, it is preferable that the hole inner peripheral surface protecting member and the outer protective member are formed integrally with the inside of the through hole and the outer peripheral surface of the battery case.
In this battery, it is not necessary to separately arrange the inner peripheral surface protective member and the outer protective member in the through hole and the outer peripheral surface of the battery case, and a battery in which these are reliably arranged can be obtained.

Alternatively, in the battery described above, the hole inner circumferential surface protection member and the outer protection member are integrated, and the hole inner circumferential surface protection member integrated with the outer protection member is used as the battery. It is preferable that the battery is formed by being fitted into the through hole of the case from the outside of the case.
In this battery, it is only necessary to fit the hole inner peripheral surface protection member integral with the outer protection member into the through hole of the battery case from the outside of the case. Therefore, the outer protection member and the hole inner peripheral surface protection member are integrated with the battery case. Compared to molding, the battery can be easily manufactured and inexpensive.

  Further, the battery includes the inner protective member made of resin and disposed on the inner peripheral surface of the battery case, and the deformed caulking portion of the deformed blind rivet includes the inner protective member. Thus, a battery formed by crimping the inner peripheral surface of the battery case may be used.

  In this battery, the inner protective member is disposed on the inner peripheral surface of the battery case, and the deformation caulking portion of the deformed blind rivet crimps the inner peripheral surface of the battery case via the inner protective member. Therefore, the deformed blind rivet does not directly contact the battery case even on the inner peripheral surface of the battery case. For this reason, when deform | transforming an undeformed blind rivet, generation | occurrence | production of the metal foreign material by this rivet contacting the peripheral inner surface of a battery case can also be reduced. Thereby, the battery which further suppressed the penetration | invasion into the battery case of a metal foreign material is obtained.

  In addition, the hole inner peripheral surface protection member and the inner side protection member may be integrated with each other or may be separate. Moreover, each may be integrated with the battery case, or may be separate from the battery case. Moreover, as resin which makes an inner side protection member, fluorine resin, such as PFA, PTFE, ETFE, etc. other than a polyamide resin, PPS, etc. are mentioned like a hole inner peripheral surface protection member and an outer side protection member.

Further, in the battery described above, the inner protective member has an annular plate shape, and the deformation caulking portion of the deformed blind rivet is formed on the inner peripheral surface of the battery case via the inner protective member. It is preferable to form a battery in which the through hole is hermetically sealed.
In this battery, the through hole is hermetically sealed between the deformed crimped portion of the deformed blind rivet and the inner peripheral surface of the battery case via the inner protective member. For this reason, airtightness between the deformed blind rivet and the inner peripheral surface of the battery case can be improved as compared with the case where the inner peripheral surface of the battery case is directly caulked by the deformation caulking portion of the deformed blind rivet. it can. Thereby, the battery which improved airtightness more is obtained.

Furthermore, in the above-described battery, it is preferable that the hole inner circumferential surface protection member and the inner protection member are integrally formed on the inside of the through hole and the peripheral inner surface of the battery case.
In this battery, it is not necessary to separately arrange the inner peripheral surface protecting member and the inner protective member inside the through hole and the inner peripheral surface of the battery case, and a battery in which these are reliably arranged can be obtained.

  In another aspect, the battery case is made of metal and has a through-hole communicating with the inside and outside of the battery case, the electrode body housed in the battery case, and the cylindrical shaft portion and the base end side of the shaft portion. A deformed rivet body including a flange portion having a diameter larger than the shaft portion and a deformed crimping portion connected to a distal end side of the shaft portion and having a diameter larger than the shaft portion, wherein the shaft portion is the through hole of the battery case; The outer periphery of the battery case is caulking the outer peripheral surface of the periphery of the through hole, and the deformed caulking portion is the peripheral edge of the inner surface of the battery case that is the periphery of the through hole. A deformed blind rivet formed by caulking the inner surface and hermetically sealing the through hole, made of resin, and provided with a hole inner peripheral surface protection member disposed in the through hole of the battery case. And the shaft portion of the deformed blind rivet The battery case is a method of manufacturing a battery that is separated from each other through the hole inner peripheral surface protection member in the through hole, and is an undeformed blind rivet before the deformed blind rivet is deformed. Has a non-deformed rivet body that includes a bottomed cylindrical shape with a closed bottom end and a shaft portion and a bottomed cylindrical portion that becomes the deformed caulking portion after deformation, and is inserted into the through hole. The bottomed cylindrical portion of the modified blind rivet is deformed into the shaft portion and the deformed caulking portion in the through hole while being spaced apart from the battery case via the hole inner peripheral surface protection member. And a battery manufacturing method including a sealing step of hermetically sealing the through hole.

In the sealing process of the battery manufacturing method, when the undeformed blind rivet is deformed, the undeformed blind is separated from the battery case in the through hole of the battery case via the hole inner peripheral surface protection member. The rivet is deformed to hermetically seal the through hole. For this reason, when deform | transforming an undeformed blind rivet, generation | occurrence | production of the metal foreign material by this rivet contacting the through-hole inner peripheral surface can be prevented.
Thereby, the battery which suppressed that a metal foreign material penetrate | invades in a battery case can be manufactured.

  Further, in the battery manufacturing method described above, prior to the sealing step, the hole inner peripheral surface protective member disposed in the through hole prevents contact with the inner peripheral surface of the battery case. However, it is preferable that the bottomed cylindrical portion of the undeformed blind rivet is a battery manufacturing method including an insertion step of inserting the bottomed cylindrical portion from the outside of the battery case into the through hole.

In the insertion step of this battery manufacturing method, when the bottomed cylindrical portion of the undeformed blind rivet is inserted into the through hole from the outside of the battery case, the battery case is protected by the hole inner peripheral surface protection member that is arranged in advance in the through hole. This prevents contact with the inner peripheral surface of the through hole. For this reason, generation | occurrence | production of the metal foreign material by an undeformed blind rivet contacting the through-hole inner peripheral surface of a battery case can also be reduced.
As a result, it is possible to manufacture a battery that further suppresses metal foreign matter from entering the battery case.

  Furthermore, in the battery manufacturing method described above, the battery is made of resin, and has an outer protective member disposed on the outer peripheral surface of the battery case, and the sealing step includes the outer peripheral surface. It is preferable to use a battery manufacturing method in which the bottomed cylindrical portion of the undeformed blind rivet is deformed while preventing contact with the outer peripheral surface by the outer protective member disposed above.

  In the sealing step of the battery manufacturing method, the undeformed blind rivet is deformed while preventing contact with the outer peripheral surface by the outer protective member disposed on the outer peripheral surface. For this reason, when deform | transforming an undeformed blind rivet, generation | occurrence | production of the metal foreign material by this rivet contacting the outer peripheral surface of a battery case can also be reduced. As a result, it is possible to manufacture a battery that further suppresses metal foreign matter from entering the battery case.

Further, in the battery manufacturing method described above, the outer protective member has an annular plate shape, and the sealing step is performed by the flange portion of the deformed blind rivet via the outer protective member. It is preferable to use a battery manufacturing method in which the through hole is hermetically sealed with the outer peripheral surface of the battery case.
In this battery manufacturing method, the outer protective member has an annular plate shape, and in the sealing process, the outer blind member is penetrated between the deformed blind rivet and the outer peripheral surface of the battery case. Seal the holes in an airtight manner. For this reason, airtightness between the deformed blind rivet and the outer peripheral surface of the battery case can be improved as compared with the case where the outer peripheral surface of the battery case is directly caulked with the deformed blind rivet. Thereby, the battery which improved airtightness can be manufactured.

Further, in the battery manufacturing method described above, prior to the sealing step, the hole inner peripheral surface protection member and the outer protective member are integrated into the through hole and the peripheral outer surface of the battery case. It is preferable to use a battery manufacturing method including a hole inner / outer protective member forming step.
Since this battery manufacturing method includes a hole inner / outer protective member forming step, it is not necessary to separately arrange the hole inner peripheral surface protecting member and the outer protective member inside the through hole and the outer peripheral surface of the battery case. Thus, the battery can be easily manufactured while reliably preventing contact between the inner peripheral surface of the through hole or the outer peripheral surface of the through hole and the rivet.

Or it is the manufacturing method of the above-mentioned battery, Comprising: The said hole inner peripheral surface protection member and the said outer side protection member were integrated, and it integrated with the said outer side protection member prior to the said sealing process. It is preferable that the hole inner peripheral surface protection member is a battery manufacturing method including a protection member fitting step of fitting the through hole of the battery case from the outside of the case.
In this battery manufacturing method, in the protective member fitting step, a hole inner peripheral surface protective member integrated with a pre-formed outer protective member is fitted into the through hole of the battery case from the outside of the case. For this reason, a battery can be manufactured cheaply compared with the case where an outer side protection member and a hole inner peripheral surface protection member are integrally molded in a battery case.

  Furthermore, in the battery manufacturing method described above, the battery includes an inner protective member made of resin and disposed on the inner peripheral surface of the battery case, and the sealing step includes the inner peripheral surface. A method of manufacturing a battery in which the bottomed cylindrical portion of the undeformed blind rivet is deformed while preventing contact with the inner peripheral surface by the inner protective member disposed above.

  In the sealing process of this battery manufacturing method, the undeformed blind rivet is deformed while preventing contact with the inner peripheral surface by the inner protective member disposed on the inner peripheral surface. For this reason, when deform | transforming an undeformed blind rivet, generation | occurrence | production of the metal foreign material by this rivet contacting the inner peripheral surface of a battery case can also be reduced. As a result, it is possible to manufacture a battery that further suppresses metal foreign matter from entering the battery case. In particular, since the generation of metallic foreign matter from the inner peripheral surface can be suppressed, it is effective for suppressing the penetration of metallic foreign matter into the battery case.

Furthermore, in the battery manufacturing method described above, the inner protective member has an annular plate shape, and the sealing step is performed via the inner protective member by the deformed caulking portion of the deformed blind rivet. It is preferable to use a battery manufacturing method in which the through hole is hermetically sealed between the peripheral inner surface of the battery case.
In this battery manufacturing method, the inner protective member has an annular plate shape, and in the sealing process, the deformed blind rivet and the inner peripheral surface of the battery case penetrate through the inner protective member. Seal the holes in an airtight manner. For this reason, airtightness between the deformed blind rivet and the inner peripheral surface of the battery case can be improved as compared with the case where the inner peripheral surface of the battery case is directly caulked with the deformed blind rivet. Thereby, the battery which improved airtightness more can be manufactured.

  Furthermore, in the battery manufacturing method described above, prior to the sealing step, the hole inner peripheral surface protection member and the inner protective member are integrated into the through hole and the peripheral inner surface of the battery case. It is good to set it as the manufacturing method of a battery provided with the inner hole inner side protection member shaping | molding process to shape | mold.

  In this battery manufacturing method, since the in-hole inner protective member forming step is provided, it is not necessary to separately arrange the inner peripheral surface protective member and the inner protective member in the through hole and the peripheral inner surface of the battery case. Thus, it is possible to easily manufacture the battery while reliably preventing contact between the inner peripheral surface of the through hole or the inner peripheral surface of the through hole and the rivet. In particular, when the inner protective member is provided, the inner protective member can be easily disposed inside the battery case by integrally forming the inner protective member in the battery case.

1 is a longitudinal sectional view showing a lithium ion secondary battery according to Embodiment 1. FIG. FIG. 3 is a longitudinal sectional view showing a sealing structure (by a deformed blind rivet) in the through hole of the battery case according to the first embodiment. FIG. 3 is a longitudinal sectional view showing a state in which an undeformed blind rivet is inserted into the through hole of the battery case according to the first embodiment. FIG. 4 is a longitudinal cross-sectional view illustrating an arrangement method of an undeformed blind rivet and a hole inner peripheral surface protection member in a through hole according to the first embodiment. It is a longitudinal cross-sectional view which shows the other placement method which concerns on the modification 1 and arrange | positions a hole inner peripheral surface protection member in a through-hole. It is a longitudinal cross-sectional view which shows the further another arrangement | positioning method which concerns on the modification 2 and arrange | positions a hole inner peripheral surface protection member in a through-hole. FIG. 6 is a longitudinal sectional view illustrating a sealing structure for a through hole of a battery case according to the second embodiment. It is a longitudinal cross-sectional view which concerns on Embodiment 2 and shows the arrangement | positioning method of a hole inner peripheral surface protection member and an outer side protection member. It is a longitudinal cross-sectional view which shows the other arrangement | positioning method which concerns on the modification 3 and arrange | positions a hole inner peripheral surface protection member and an outer side protection member. FIG. 6 is a longitudinal sectional view showing a sealing structure for a through hole of a battery case according to the third embodiment. It is a longitudinal cross-sectional view which concerns on Embodiment 3 and shows the arrangement | positioning method of the hole inner peripheral surface protection member integrated with the outer side protection member. FIG. 10 is a longitudinal sectional view illustrating a sealing structure for a through hole of a battery case according to the fourth embodiment. It is a longitudinal cross-sectional view which concerns on Embodiment 4 and shows the arrangement | positioning method of a hole inner peripheral surface protection member and an inner side protection member. FIG. 10 is an explanatory diagram showing a hybrid vehicle according to a fifth embodiment. It is explanatory drawing which shows the hammer drill which concerns on Embodiment 6. FIG.

(Embodiment 1)
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a lithium ion secondary battery (sealed battery) 1 (hereinafter also simply referred to as battery 1) according to the first embodiment. FIG. 2 shows a sealing structure of the through hole 12H (liquid injection hole). In this specification, the upper side in FIGS. 1 and 2 is described as the upper side UW of the battery 1 and the lower side is described as the lower side DW of the battery 1.

  The battery 1 is a prismatic battery mounted on a vehicle such as a hybrid vehicle or an electric vehicle, or a battery-powered device such as a hammer drill. The battery 1 includes a rectangular parallelepiped battery case 10, a wound electrode body 20 accommodated in the battery case 10, a positive terminal 40 and a negative terminal 41 supported by the battery case 10 ( (See FIG. 1). Further, a non-aqueous electrolyte solution 17 is held in the battery case 10.

  Of these, the battery case 10 is made of metal (aluminum in the first embodiment). The battery case 10 includes a rectangular parallelepiped box-shaped case main body member 11 in which only the upper UW is opened, and a rectangular plate-shaped case cover member 12 welded in a form for closing the opening 11H of the case main body member 11. ing. The case lid member 12 has an outer surface 13 facing the outside of the battery case 10 and an inner surface 14 facing the inside of the battery case 10.

  The case lid member 12 is provided with a safety valve 15 that is broken when the internal pressure of the battery case 10 reaches a predetermined pressure. Further, the case lid member 12 is provided with a through hole 12H (liquid injection hole) that communicates the inside and outside of the battery case 10. The through hole 12H is hermetically sealed from the outside of the battery case 10 by a deformed blind rivet 60.

  Further, the case lid member 12 is fixedly provided with a positive electrode terminal 40 and a negative electrode terminal 41 each constituted by an extended terminal member 42 and a bolt 43 via an insulating member 44 made of resin. In the battery case 10, the positive electrode terminal 40 is connected to the positive electrode plate 21 (the positive electrode current collector 21 m) of the electrode body 20, and the negative electrode terminal 41 is connected to the negative electrode plate 31 (the negative electrode current collector 31 m) of the electrode body 20. Has been.

  Next, the electrode body 20 will be described. The electrode body 20 is accommodated in the insulating film enclosure 16 formed in a bag shape in which only the upper UW is opened, and is accommodated in the battery case 10 in a laid state. This electrode body 20 is obtained by winding a belt-like positive electrode plate 21 and a belt-like negative electrode plate 31 on each other via a belt-like separator 34 and compressing them in a flat shape.

  The positive electrode plate 21 has a positive electrode current collector foil 22 made of a strip-shaped aluminum foil as a core material. A positive electrode active material layer 23 is provided in a strip shape on a region extending in the longitudinal direction in a part of the width direction of both main surfaces of the positive electrode current collector foil 22. The positive electrode active material layer 23 is formed of a positive electrode active material, a conductive agent, and a binder. In addition, one end in the width direction of the positive electrode current collector foil 22 is a positive electrode current collector part 21m in which the positive electrode active material layer 23 does not exist in the thickness direction of the positive electrode current collector foil 22, The positive electrode terminal 40 is connected.

  Moreover, the negative electrode plate 31 has the negative electrode current collection foil 32 which consists of strip | belt-shaped copper foil as a core material. On both main surfaces of the negative electrode current collector foil 32, a negative electrode active material layer 33 is provided in a band shape on a region extending in the longitudinal direction and part of the width direction. The negative electrode active material layer 33 is formed of a negative electrode active material, a binder, and a thickener. In addition, one end in the width direction of the negative electrode current collector foil 32 is a negative electrode current collector 31m in which the negative electrode active material layer 33 does not exist in the thickness direction of the negative electrode current collector foil 32. The negative electrode terminal 41 is connected.

  The separator 34 is a porous film made of resin, specifically, polypropylene (PP) and polyethylene (PE), and has a strip shape.

  Next, the sealing structure of the through hole 12H (injection hole) will be described. As described above, the case lid member 12 is provided with a through hole 12H (a liquid injection hole) that communicates the inside and the outside of the battery case 10. In addition, a cylindrical hole inner peripheral surface protection member 71 made of resin (specifically, PTFE of fluororesin) is disposed in the through hole 12H. A deformed blind rivet 60 that seals the through-hole 12H includes a deformed rivet body 61 having a substantially bottomed cylindrical shape and a broken shaft portion 65 having an inverted T-shaped cross section surrounded by the deformed rivet body 61 (undeformed blind described later). The rivet 50 includes an enlarged diameter portion 56 and a core shaft portion 57). Among these, the deformed rivet body 61 includes a shaft portion 63, a flange portion 52, and a deformation crimping portion 64. In the deformed rivet body 61, the shaft portion 63 is cylindrical and is inserted into the through hole 12H, and the battery case 10 includes the hole inner peripheral surface protection member 71 disposed in the through hole 12H. Are spaced apart from each other (see FIG. 2). Here, the lower side in FIG. 2 (the lower side DW of the battery 1) is the tip side HS of the deformed blind rivet 60 and the deformed rivet body 61, and the upper side in FIG. It becomes the base end side HK (the opposite side of the front end side HS) of the rivet 60 and the deformed rivet body 61 (the same applies to the subsequent drawings). The flange portion 52 of the deformed rivet body 61 is connected to the base end side HK of the shaft portion 63 and contacts the peripheral outer surface 13c that is the peripheral edge of the through hole 12H in the outer surface 13 of the battery case 10 (case lid member 12). In close contact, this is airtight. Moreover, the deformation | transformation crimping | crimped part 64 continues to the front end side HS of the axial part 63, is deform | transformed larger diameter than the axial part 63, and is the periphery of the through-hole 12H among the inner surfaces 14 of the battery case 10 (case cover member 12). It abuts against a certain peripheral inner surface 14c and is caulked. Thus, the through hole 12H of the battery case 10 is hermetically sealed by the deformed blind rivet 60.

  The deformed blind rivet 60 is obtained by deforming a part of an undeformed blind rivet 50 described later and providing the through hole 12H for sealing.

  Next, a method for manufacturing the battery 1 according to the first embodiment will be described. First, the separately formed belt-like positive electrode plate 21 and negative electrode plate 31 are overlapped with each other via a belt-like separator 34 and wound using a winding core. Thereafter, the electrode body 20 is formed by compressing it into a flat shape.

  On the other hand, the case lid member 12 having the safety valve 15 and the through-hole 12H formed therein, the extended terminal member 42 and the bolt 43 are prepared, the insulating member 44 is formed by injection molding, and the positive electrode terminal 40 is formed on the case lid member 12. The negative terminal 41 is fixed.

Next, the positive electrode terminal 40 and the positive electrode current collector 21m of the electrode body 20 are connected (welded). Further, the negative electrode terminal 41 and the negative electrode current collector 31m of the electrode body 20 are connected (welded). Then, the case main body member 11 and the insulating film enclosure 16 are prepared, and the electrode body 20 is accommodated in the case main body 11 via the insulating film enclosure 16, and the opening 11H of the case main body member 11 is provided with the case lid member 12. Close with. Then, the battery case 10 is formed by welding the case main body member 11 and the case lid member 12 by laser welding. (See Figure 1)
Separately, an annular hole inner peripheral surface protection member 71 disposed in the through hole 12H of the battery case 10 is molded with resin.

  Next, the aforementioned battery is placed in a vacuum chamber, and the inside of the vacuum chamber is decompressed. Then, a liquid injection nozzle is inserted into the through-hole 12H, and the electrolytic solution 17 is injected into the battery case 10 from the liquid injection nozzle.

Next, the through hole 12H is sealed using the undeformed blind rivet 50 under reduced pressure. First, the configuration of the undeformed blind rivet 50 used in the first embodiment will be described.
As shown in FIGS. 3 and 4, the undeformed blind rivet 50 includes an undeformed rivet main body 51 having a bottomed cylindrical shape at the front end HS (downward in FIGS. 3 and 4) and the undeformed rivet main body 51. And a rod-shaped (undeformed) shaft portion 55 arranged in the shape.
Among these, the undeformed rivet body 51 made of aluminum has a bottomed cylindrical shape with a closed front end HS, and a cylindrical portion 53 inserted into the through-hole 12H, and a proximal end side HK of the cylindrical portion 53 (see FIG. 3, and has an annular flange 52 that is larger in diameter than the cylindrical portion 53 and engages with the outer surface 13 of the battery case 10. Further, of the cylindrical portion 53, the cylindrical distal end portion 53s of the distal end side HS is formed so that the inner diameter is larger (thinner) than the proximal end side HK. For this reason, a stepped portion 53d is formed in the cylindrical portion 53 due to a change in thickness.

  On the other hand, the undeformed shaft portion 55 is made of stainless steel, and the shaft tip portion 55s on the tip side HS (downward in FIGS. 3 and 4) is disposed in the cylindrical portion 53 of the undeformed rivet body 51. Yes. The distal end portion of the shaft distal end portion 55 s has an enlarged diameter portion 56 that is enlarged in diameter so as to be engageable with the stepped portion 53 d within the cylindrical distal end portion 53 s of the cylindrical portion 53. Further, the shaft portion 55 includes, in addition to the enlarged diameter portion 56, a core shaft portion 57, a planned fracture portion 58, in order from the enlarged diameter portion 56 toward the base end side HK (upward in FIGS. 3 and 4). An operation rod portion 59 is provided. The core shaft portion 57 is cylindrical and has a smaller diameter than the enlarged diameter portion 56. Further, the planned fracture portion 58 has a smaller diameter than the core shaft portion 57. The operation rod portion 59 has a cylindrical shape with the same diameter as the core shaft portion 57 and extends to the outside of the undeformed rivet body 51.

  Here, a cylindrical portion 53 of the undeformed blind rivet 50 is inserted into a tightly fitted state through a separately formed hole inner peripheral surface protection member 71, and the hole inner peripheral surface protection member 71 is held (FIG. 4).

  In the insertion step, the cylindrical portion 53 of the undeformed blind rivet 50 that holds the hole inner circumferential surface protection member 71 in advance until the flange portion 52 comes into contact with the peripheral outer surface 13c of the outer surface 13 of the battery case 10 until The battery case 10 is inserted into the through hole 12H. Then, the hole inner peripheral surface protection member 71 is disposed in the through hole 12H, and the hole inner peripheral surface protection member 71 allows the cylindrical portion 53 of the subsequent undeformed blind rivet 50 and the inner periphery of the through hole of the battery case 10 to be formed. Contact with the surface 12c is prevented (see FIG. 3).

  In the subsequent sealing step, of the undeformed blind rivet 50 inserted through the through-hole 12H, the operating rod portion of the shaft portion 55 is pressed with the flange portion 52 of the undeformed rivet body 51 against the outer surface 13 of the battery case 10. 59 is pulled up to the proximal side HK (upper UW in FIG. 3). Then, the enlarged diameter portion 56 of the shaft portion 55 engages with a step portion 53 d formed in the cylindrical portion 53 of the undeformed rivet body 51. When the operating rod portion 59 is further lifted, the portion of the cylindrical portion 53 that is closer to the base end HK than the stepped portion 53d and to the tip end HS from the through hole 12H is buckled, and is pushed outward in the radial direction. And is in pressure contact with the peripheral inner surface 14 c of the inner surface 14 of the battery case 10. As a result, the cylindrical portion 53 is connected to the cylindrical shaft portion 63 inserted into the through hole 12H and the distal end side HS of the shaft portion 63, and is closely engaged with the peripheral inner surface 14c of the through hole 12H. It deform | transforms into the deformation crimping part 64 with a larger diameter. At the same time, the deformed crimping portion 64 caulks the peripheral inner surface 14c, which is the peripheral edge of the through hole 12H, of the inner surface 14 of the battery case 10. On the other hand, the flange portion 52 is not deformed and crimps the peripheral outer surface 13c that is the peripheral edge of the through hole 12H in the outer surface 13 of the battery case 10. Thus, the undeformed rivet body 51 becomes a deformed rivet body 61 including the flange portion 52, the shaft portion 63, and the deformed crimping portion 64. Subsequently, the operating rod portion 59 is further pulled up, and the shaft portion 55 is broken at the planned breaking portion 58. Thus, only the broken shaft portion 65 including the enlarged diameter portion 56 and the core shaft portion 57 is left in the deformed rivet body 61 (the operation rod portion 59 is removed). As described above, the undeformed blind rivet 50 becomes the deformed blind rivet 60 having the deformed rivet body 61 and the broken shaft portion 65 as shown in FIG. 2, and the through hole 12H is hermetically sealed.

  By the way, the hole inner peripheral surface protection member 71 is disposed in the through hole 12H. Therefore, when the undeformed blind rivet 50 inserted into the through hole 12H is deformed, it can be deformed into the deformed blind rivet 60 without contacting the through hole inner peripheral surface 12c of the battery case 10.

  Thereafter, the inside of the vacuum chamber is returned to atmospheric pressure, and the battery 1 whose sealing has been completed is taken out from the vacuum chamber. Thereby, the battery case 10 of the battery 1 is sealed in a state where the inside is depressurized from the atmospheric pressure.

  Next, in the conditioning process (initial charge / discharge process), initial charge / discharge of the battery 1 is performed. Thus, the battery 1 is completed.

As described above, the battery 1 according to the first embodiment has the hole inner peripheral surface protection member 71 made of resin in the through hole 12H that communicates the inside and outside of the battery case 10 made of metal. The through hole 12H has a shaft portion 63 inserted into the through hole 12H, and the flange portion 52 caulks the peripheral outer surface 13c, which is the periphery of the through hole 12H, of the outer surface 13 of the battery case 10. The portion 64 is hermetically sealed by a deformed blind rivet 60 in which a peripheral inner surface 14c that is a peripheral edge of the through hole 12H in the inner surface 14 of the battery case 10 is crimped.
Here, the shaft part 63 of the deformed blind rivet 60 and the battery case 10 are separated from each other via the hole inner peripheral surface protection member 71 in the through hole 12H.
For this reason, when the undeformed blind rivet 50 is deformed, the rivet 50 does not come into contact with the inner peripheral surface 12c of the through hole of the battery case 10 and there is no possibility of generating a metal foreign object (metal piece or metal powder).
Therefore, the battery 1 in which the metal foreign matter is prevented from entering the battery case 10 is obtained.

In addition, in the sealing process of the manufacturing method of the battery 1 according to the first embodiment, when the undeformed blind rivet 50 is deformed, the through hole 12H of the battery case 10 is interposed through the hole inner peripheral surface protection member 71. The undeformed blind rivet 50 is deformed while being separated from the battery case 10 to hermetically seal the through hole 12H. For this reason, when the undeformed blind rivet 50 is deformed, it is possible to prevent the occurrence of metallic foreign matter due to the rivet 50 coming into contact with the inner peripheral surface 12c of the through hole.
Thereby, the battery 1 which suppressed that a metal foreign material penetrate | invades in the battery case 10 can be manufactured.

Further, in the insertion step of the manufacturing method of the battery 1, when the cylindrical portion 53 of the undeformed blind rivet 50 is inserted from the outside of the battery case 10 into the through hole 12H, the inner peripheral surface of the hole disposed in advance in the through hole 12H is protected. The member 71 prevents contact with the through hole inner peripheral surface 12 c of the battery case 10. For this reason, generation | occurrence | production of the metal foreign material by the undeformed blind rivet 50 contacting the through-hole inner peripheral surface 12c of the battery case 10 can also be reduced.
Thereby, it is possible to manufacture the battery 1 in which the metal foreign matter is further suppressed from entering the battery case 10.

(Modification 1)
In the first embodiment, the cylindrical inner portion 53 of the undeformed blind rivet 50 is inserted into the hole inner peripheral surface protection member 71 in an interference fit state in advance, and the hole inner peripheral surface protection member 71 is held. By inserting the undeformed blind rivet 50 holding the hole inner peripheral surface protection member 71 into the through hole 12H, the hole inner peripheral surface protection member 71 was disposed in the through hole 12H (see FIG. 4).
However, the hole inner peripheral surface protection member 71 may be disposed in the through hole 12H using a method other than the first embodiment. For example, as the hole inner peripheral surface protection member 171, a cylindrical member made of a resin and having a tapered shape whose outer peripheral surface is larger in diameter toward the upper side and slightly larger than the diameter of the through hole 12H near the upper end is formed. In addition, by inserting the battery case 10 into the through hole 12H from the outside, the hole inner peripheral surface protection member 171 can be fixed in the through hole 12H. After that, the cylindrical portion 53 of the undeformed blind rivet 50 may be inserted into the undeformed blind rivet 60 (see FIG. 5). In addition, when the undeformed blind rivet 60 is deformed, the entire hole inner peripheral surface protection member 171 is pushed into the through hole 12H.

(Modification 2)
Further, after the cylindrical hole inner peripheral surface protection member 271 is integrally formed in advance in the through hole 12H of the battery case 10, the cylindrical portion 53 of the undeformed blind rivet 50 is inserted into the deformed blind rivet. You may make it change to 60 (refer FIG. 6).

(Embodiment 2)
Next, a second embodiment will be described. In the first embodiment, a cylindrical hole inner peripheral surface protection member 71 that is separate from the battery case 10 (case cover member 12) is used. On the other hand, in the lithium ion secondary battery (sealed battery) 2 according to the second embodiment, a hole in which the cylindrical hole inner peripheral surface protection member 72 and the annular plate outer protection member 82 are integrated. The difference is that the inner / outer protection member 92 is used and the battery case 10 (case lid member 12) is integrally molded. On the other hand, since it is the same as that of Embodiment 1 about the other than that structure, the same number is attached | subjected to the site | part similar to Embodiment 1, and description is abbreviate | omitted or simplified.

  The battery 2 according to the second embodiment has a cylindrical hole inner peripheral surface protection member 72 made of resin (specifically, PFA) in a through hole 12H that communicates the inside and outside of the battery case 10 made of metal. doing. In addition, it has an annular plate-shaped outer protective member 82 made of the same resin as the hole inner peripheral surface protective member 72 and disposed on the outer peripheral surface 13 c of the battery case 10. These holes integrally form a hole inner / outer protective member 92 and are integrally formed on the inner peripheral surface 12c and the outer peripheral surface 13c of the through hole in the through hole 12H of the battery case 10 (see FIG. 8). ).

  Of the deformed blind rivets 60, the shaft portion 63 of the deformed rivet body 61 having a substantially bottomed cylindrical shape is inserted into the through hole 12H, and the battery case 10 is a hole disposed in the through hole 12H. The inner peripheral surface protection member 72 is separated from each other. Further, the flange portion 52 of the deformed blind rivet 60 (the deformed rivet body 61) is in contact with the outer protective member 82, and is the periphery of the through hole 12H in the outer surface 13 of the battery case 10 via this. The outer peripheral surface 13c is crimped. On the other hand, the deformation caulking portion 64 abuts on the inner peripheral surface 14c of the inner surface 14 of the battery case 10 which is the peripheral edge of the through hole 12H, and caulks this. Thereby, the through hole 12H of the battery case 10 is hermetically sealed by the deformed blind rivet 60 (see FIG. 7).

  In particular, in the second embodiment, an outer protective member 82 made of resin is interposed between the flange portion 52 of the deformed blind rivet 60 (deformed rivet body 61) and the peripheral outer surface 13c of the battery case 10. Therefore, the space between the flange portion 52 and the peripheral outer surface 13c, and thus the through hole 12H, can be sealed more reliably and airtightly. About another structure, it is the same as that of the battery 1 of Embodiment 1. FIG.

Next, a method for manufacturing the battery 2 according to Embodiment 2 will be described. Again, description of the same parts as those of the manufacturing method of the battery 1 according to Embodiment 1 is omitted or simplified. In the manufacturing method of the battery 2, in the hole inner / outer protective member forming step, the hole inner / outer protective member 92 made of resin is provided on the through hole inner peripheral surface 12c and the peripheral outer surface 13c in the through hole 12H provided in the case lid member 12. Are integrally formed in advance (see FIG. 8).
And after accommodating the electrode body 20 in the case main body member 11, the opening 11H of the case main body member 11 is closed with the case lid member 12, and both are welded by laser welding to form the battery case 10.

  Next, after the electrolyte solution 17 is injected into the battery case 10 from the through hole 12H under reduced pressure in the vacuum chamber, the undeformed blind rivet 50 is integrally formed with the inside / outside protection member 92 in the insertion step. The through hole 12H is inserted. At this time, due to the presence of the hole inner peripheral surface protection member 72 in the hole inner / outer protection member 92, contact between the cylindrical portion 53 of the undeformed blind rivet 50 and the through hole inner peripheral surface 12c of the battery case 10 is prevented.

  In the sealing step, the undeformed blind rivet 50 inserted through the through hole 12H is deformed. Specifically, the cylindrical portion 53 of the undeformed blind rivet 50 is separated from the battery case 10 via the hole inner peripheral surface protection member 72 in the through hole 12H. At the same time, the outer protective member 82 arranged on the outer peripheral surface 13c of the battery case 10 prevents contact between the flange 52 and the outer peripheral surface 13c. In this way, the cylindrical portion 53 is deformed into the shaft portion 63 and the deformation caulking portion 64, and the through hole 12H is hermetically sealed. After the deformation, the through hole 12H is hermetically sealed through the outer protective member 82 between the flange portion 52 of the deformed blind rivet 60 and the outer peripheral surface 13c of the battery case 10. Thereafter, the battery 2 is taken out from the vacuum chamber, and the battery 2 is completed after the conditioning process.

Thus, also in the battery 2 according to the second embodiment, the hole inner peripheral surface protection member 72 made of resin is provided in the through hole 12H that communicates the inside and outside of the battery case 10 made of metal, as in the first embodiment. The shaft 63 of the deformed blind rivet 60 and the battery case 10 are separated from each other via the hole inner peripheral surface protection member 72 in the through hole 12H.
Therefore, as in the first embodiment, when the undeformed blind rivet 50 is deformed, the rivet 50 does not come into contact with the inner peripheral surface 12c of the through hole of the battery case 10 to generate a metal foreign object. Can be obtained in which the battery 2 is prevented from entering the battery case 10. In addition, the same part as Embodiment 1 has the same effect as Embodiment 1. FIG.

Further, in the method for manufacturing the battery 2 according to the second embodiment, when the cylindrical portion 53 of the undeformed blind rivet 50 is inserted into the through hole 12H of the battery case 10 in the insertion process, the hole inner peripheral surface protection member 72 The contact with the through-hole inner peripheral surface 12c of the battery case 10 is prevented. Further, in the sealing step, when the undeformed blind rivet 50 is deformed, the undeformed blind rivet 50 is deformed in a state of being separated from the battery case 10 via the hole inner peripheral surface protection member 74, and the through hole is formed. 12H is sealed. For this reason, when the undeformed blind rivet 50 is inserted and deformed, it is possible to prevent the occurrence of metallic foreign matter due to contact with the inner peripheral surface 12c of the through hole of the battery case.
Thereby, the battery 2 which suppressed that a metal foreign material penetrate | invades in the battery case 10 can be manufactured.

  Further, in the battery 2, an outer protective member 82 is disposed on the outer peripheral surface 13c of the battery case 10, and in the sealing process of the manufacturing method of the battery 2, the outer protective member 82 and the outer peripheral member 13c are connected to each other. The undeformed blind rivet 50 is deformed while preventing contact. For this reason, when deform | transforming the undeformed blind rivet 50, generation | occurrence | production of the metal foreign material by this rivet 50 contacting the outer peripheral surface 13c of the battery case 10 can also be reduced. Thereby, the battery 2 in which the metal foreign matter is further suppressed from entering the battery case 10 can be manufactured.

  Further, in the battery 2, the outer protective member 82 has an annular plate shape, and in the sealing process of the manufacturing method of the battery 2, the deformed blind rivet 60 and the battery case 10 are interposed via the outer protective member 82. The through hole 12H is hermetically sealed with the peripheral outer surface 13c. For this reason, airtightness between the deformed blind rivet 60 and the outer peripheral surface 13c of the battery case 10 is improved as compared with the case where the outer peripheral surface 13c of the battery case 10 is directly crimped by the deformed blind rivet 60. be able to. Thereby, the battery 2 which improved airtightness can be manufactured.

  Furthermore, the manufacturing method of the battery 2 includes a hole inner / outer protective member forming step. In the battery 2, the hole inner peripheral surface protective member 72 and the outer protective member 82 are integrally formed in the battery case 10. For this reason, it is not necessary to separately arrange the hole inner peripheral surface protecting member 72 and the outer protective member 82 on the through hole inner peripheral surface 12c and the peripheral outer surface 13c in the through hole 12H of the battery case 10. Thus, the battery 2 can be easily manufactured while reliably preventing contact between the inner peripheral surface 12c of the through hole and the outer peripheral surface 13c and the rivet 50.

(Modification 3)
In the second embodiment, the hole inner / outer protection member 92 in which the hole inner peripheral surface protection member 72 and the outer protection member 82 are integrated is integrally formed with the battery case 10. However, the hole inner peripheral surface protection member 172 and the outer protection member 182 that are separate from each other may be formed integrally with the battery case 10 (see FIG. 9).

(Embodiment 3)
Next, a third embodiment will be described. In the lithium ion secondary battery (sealed battery) 3 according to the third embodiment, as in the second embodiment, the cylindrical hole inner peripheral surface protection member 73 and the annular plate outer protection member 83 are integrated. The hole inner / outer protective member 93 is used. However, unlike the second embodiment, the inside / outside hole protection member 93 is formed separately from the battery case 10 (case cover member 12) and is fitted into the through hole 12H from the outside of the case. On the other hand, since it is the same as that of Embodiment 1, 2, about the structure other than that, the same number is attached | subjected to the site | part similar to Embodiment 1, 2, and description is abbreviate | omitted or simplified.

  The battery 3 according to the third embodiment has a cylindrical hole inner peripheral surface protection member 73 made of resin (specifically, PFA) in the through hole 13 that communicates the inside and outside of the battery case 10 made of metal. doing. In addition, it has an annular plate-shaped outer protective member 83 made of the same resin as the hole inner peripheral surface protective member 73 and disposed on the outer peripheral surface 13 c of the battery case 10. These holes integrally form a hole inner / outer protective member 93 and are fitted into the through holes 12H of the battery case 10 from the outer side of the case (see FIG. 11).

  Of the deformed blind rivets 60, the shaft portion 63 of the deformed rivet body 61 having a substantially bottomed cylindrical shape is inserted into the through hole 12H, and the battery case 10 is a hole disposed in the through hole 12H. The inner peripheral surface protection member 73 is spaced apart from each other. Further, the flange portion 52 of the deformed blind rivet 60 (the deformed rivet body 61) is in contact with the outer protective member 83, and is the periphery of the through hole 12H in the outer surface 13 of the battery case 10 via this. The outer peripheral surface 13c is crimped. On the other hand, the deformation caulking portion 64 abuts on the inner peripheral surface 14c of the inner surface 14 of the battery case 10 which is the peripheral edge of the through hole 12H, and caulks this. Thereby, the through hole 12H of the battery case 10 is hermetically sealed by the deformed blind rivet 60 (see FIG. 10). About another structure, it is the same as that of the battery 2 of Embodiment 2. FIG.

  Next, a method for manufacturing the battery 3 according to Embodiment 3 will be described. Again, description of the same parts as those of the method for manufacturing the battery 2 according to Embodiment 2 is omitted or simplified. In manufacturing the battery 3, the inside / outside protection member 93 in which the cylindrical inside periphery protection member 73 and the annular plate-like outside protection member 83 are integrated in advance with the case lid member 12 of the battery case 10. Are separate and molded from resin. And after accommodating the electrode body 20 in the battery case 10 and injecting the electrolyte solution 17 into the battery case 10 from the through hole 12H under reduced pressure, in the protective member fitting step prior to the insertion step and the sealing step, The inside / outside protective member 93 is fitted from the outside of the case so that the inner peripheral surface protecting member 73 is inserted into the through hole 12H of the battery case 10 (see FIG. 11). The subsequent insertion process, sealing process, and subsequent processes are the same as in the method for manufacturing the battery 2 of the second embodiment.

  Similarly to the second embodiment, the battery 3 according to the third embodiment also has the hole inner peripheral surface protection member 73 made of resin in the through hole 12H of the battery case 10, and in addition, It also has an outer protective member 83 made of the same resin and disposed on the peripheral outer surface 13c. Therefore, when the rivet 50 is deformed, a metal foreign matter is generated on the inner peripheral surface 12 c and the outer peripheral surface 13 c of the through hole, and the battery 3 is obtained in which the metal foreign matter is prevented from entering the battery case 10.

  Furthermore, the manufacturing method of the battery 3 includes a protective member fitting step, and the battery 3 has a hole inner peripheral surface protective member 73 integrated with a pre-formed outer protective member 83 in the through hole 12H of the battery case 10. It is fitted from the outside of the case. For this reason, the battery 3 can be manufactured at a lower cost than when the outer protective member 83 and the hole inner peripheral surface protective member 73 are formed integrally with the battery case 10. In addition, the same part as Embodiments 1 and 2 has the same effect as Embodiments 1 and 2.

(Embodiment 4)
Next, a fourth embodiment will be described. In the first embodiment, a cylindrical hole inner peripheral surface protection member 71 that is separate from the battery case 10 (case cover member 12) is used. On the other hand, in the lithium ion secondary battery (sealed battery) 4 according to the fourth embodiment, the hole in which the cylindrical hole inner peripheral surface protective member 74 and the annular plate-shaped inner protective member 84 are integrated. The difference is that the inner / inner protection member 94 is used and the battery case 10 (case lid member 12) is integrally molded. On the other hand, since it is the same as that of Embodiment 1 about the other than that structure, the same number is attached | subjected to the site | part similar to Embodiment 1, and description is abbreviate | omitted or simplified.

  The battery 4 according to the fourth embodiment has a cylindrical hole inner peripheral surface protection member 74 made of resin (specifically, PFA) in the through hole 13 that communicates the inside and outside of the battery case 10 made of metal. doing. In addition, it has an annular plate-shaped inner protective member 84 made of the same resin as the hole inner peripheral surface protective member 74 and disposed on the peripheral inner surface 13d of the battery case 10. These are integrated to form an in-hole inner protective member 94, and are integrally formed on the through-hole inner peripheral surface 12c and the peripheral inner surface 14c in the through-hole 12H of the battery case 10 (see FIG. 13). ).

  Of the deformed blind rivets 60, the shaft portion 63 of the deformed rivet body 61 having a substantially bottomed cylindrical shape is inserted into the through hole 12H, and the battery case 10 is a hole disposed in the through hole 12H. The inner peripheral surface protection members 74 are spaced apart from each other. Further, the flange portion 52 of the deformed blind rivet 60 (deformed rivet main body 61) abuts on the outer peripheral surface 13c which is the peripheral edge of the through hole 12H in the outer surface 13 of the battery case 10, and caulks this. Yes. On the other hand, the deformation caulking portion 64 abuts on the inner protection member 84, and via this, the peripheral inner surface 14c, which is the peripheral edge of the through hole 12H, of the inner surface 14 of the battery case 10 is crimped. Thereby, the through hole 12H of the battery case 10 is hermetically sealed by the deformed blind rivet 60 (see FIG. 12).

  In particular, in the fourth embodiment, an inner protective member 84 made of resin is interposed between the deformation caulking portion 64 of the deformed blind rivet 60 (the deformed rivet body 61) and the peripheral inner surface 14c of the battery case 10. Therefore, the space between the deformed crimping portion 64 and the peripheral inner surface 14c, and thus the through-hole 12H, can be sealed more reliably and hermetically. About another structure, it is the same as that of the battery 1 of Embodiment 1. FIG.

Next, a method for manufacturing the battery 4 according to Embodiment 4 will be described. Again, description of the same parts as those of the manufacturing method of the battery 1 according to Embodiment 1 is omitted or simplified. In the method for manufacturing the battery 4, in the in-hole inner protective member forming step, the inner hole inner protective member 94 made of resin is provided on the through hole inner peripheral surface 12c and the peripheral inner surface 14c in the through hole 12H provided in the case lid member 12. (See FIG. 13).
And after accommodating the electrode body 20 in the case main body member 11, the opening 11H of the case main body member 11 is closed with the case lid member 12, and both are welded by laser welding to form the battery case 10.

  Next, after the electrolyte solution 17 is injected into the battery case 10 from the through hole 12H under reduced pressure in the vacuum chamber, the undeformed blind rivet 50 is integrally formed with the inner protective member 94 in the hole in the insertion process. The through hole 12H is inserted. At this time, the presence of the hole inner peripheral surface protection member 74 in the hole inner protective member 94 prevents contact between the cylindrical portion 53 of the undeformed blind rivet 50 and the through hole inner peripheral surface 12c of the battery case 10.

  In the sealing step, the undeformed blind rivet 50 inserted through the through hole 12H is deformed. Specifically, the cylindrical portion 53 of the undeformed blind rivet 50 is in a state of being separated from the battery case 10 via the hole inner peripheral surface protection member 74 in the through hole 12H. At the same time, the inner protective member 84 disposed on the inner peripheral surface 14c of the battery case 10 prevents contact with the inner peripheral surface 14c. In this way, the cylindrical portion 53 is deformed into the shaft portion 63 and the deformation caulking portion 64, and the through hole 12H is hermetically sealed. After the deformation, the through hole 12H is hermetically sealed via the inner protective member 84 between the deformation caulking portion 64 of the deformed blind rivet 60 and the peripheral inner surface 14c of the battery case 10. Thereafter, the battery 4 is taken out from the vacuum chamber, and the battery 4 is completed after the conditioning process.

Thus, also in the battery 4 according to the fourth embodiment, the hole inner peripheral surface protection member 74 made of resin is provided in the through hole 12H that communicates the inside and outside of the battery case 10 made of metal, as in the first embodiment. The shaft portion 63 of the deformed blind rivet 60 and the battery case 10 are separated from each other via the hole inner peripheral surface protection member 74 in the through hole 12H.
Therefore, as in the first embodiment, when the undeformed blind rivet 50 is deformed, the rivet 50 does not come into contact with the inner peripheral surface 12c of the through hole of the battery case 10 to generate a metal foreign object. Can be obtained in which the battery 4 is prevented from entering the battery case 10. In addition, the same part as Embodiment 1 has the same effect as Embodiment 1. FIG.

In addition, in the method for manufacturing the battery 4 according to the fourth embodiment, when the cylindrical portion 53 of the undeformed blind rivet 50 is inserted into the through hole 12H of the battery case 10 in the insertion process, the hole inner peripheral surface protection member 74 is used. The contact with the through-hole inner peripheral surface 12c of the battery case 10 is prevented. Further, in the sealing step, when the undeformed blind rivet 50 is deformed, the undeformed blind rivet 50 is deformed in a state of being separated from the battery case 10 via the hole inner peripheral surface protection member 74, and the through hole is formed. 12H is sealed. For this reason, when the undeformed blind rivet 50 is inserted and deformed, it is possible to prevent the occurrence of metallic foreign matter due to contact with the inner peripheral surface 12c of the through hole of the battery case.
Thereby, the battery 4 which suppressed that a metal foreign material penetrate | invades in the battery case 10 can be manufactured.

  Further, in the battery 4, the inner protective member 84 is disposed on the peripheral inner surface 14 c of the battery case 10, and in the sealing process of the manufacturing method of the battery 4, the inner protective member 84 and the peripheral inner surface 14 c are used. The undeformed blind rivet 50 is deformed while preventing contact. For this reason, when deform | transforming the undeformed blind rivet 50, generation | occurrence | production of the metal foreign material by this rivet 50 contacting the peripheral inner surface 14c of the battery case 10 can also be reduced. Thereby, it is possible to manufacture the battery 4 in which the metal foreign matter is further suppressed from entering the battery case 10. In particular, since the generation of metal foreign matter from the peripheral inner surface 14c can be suppressed, it is effective for suppressing the entry of metal foreign matter into the battery case 10.

  Further, in the battery 4, the inner protective member 84 has an annular plate shape, and in the sealing process of the manufacturing method of the battery 4, the deformed blind rivet 60 and the battery case 10 are interposed via the inner protective member 84. The through hole 12H is hermetically sealed with the peripheral inner surface 14c. Therefore, the airtightness between the deformed blind rivet 60 and the peripheral inner surface 14c of the battery case 10 is improved as compared with the case where the peripheral inner surface 14c of the battery case 10 is directly crimped by the deformed blind rivet 60. be able to. Further, by improving the airtightness inside the battery case 10, it is possible to increase the airtightness compared to the case where the outer protective member 82 is provided outside the battery case 10. Thereby, the battery 4 which improved airtightness more can be manufactured.

  Furthermore, the manufacturing method of the battery 4 includes a hole inner protective member forming step. In the battery 4, the hole inner peripheral surface protective member 74 and the inner protective member 84 are integrally formed in the battery case 10. For this reason, it is not necessary to separately arrange the hole inner peripheral surface protecting member 74 and the inner protective member 84 on the through hole inner peripheral surface 12c and the peripheral inner surface 14c in the through hole 12H of the battery case 10. Thus, the battery 4 can be easily manufactured while reliably preventing the through-hole inner peripheral surface 12c or the peripheral inner surface 14c from contacting the rivet 50. In particular, when the inner protective member 84 is provided, the inner protective member 84 can be easily placed inside the battery case 10 by integrally forming the inner protective member 84 in the battery case 10.

(Embodiment 5)
Next, a fifth embodiment will be described. A hybrid vehicle (vehicle) 700 (hereinafter also simply referred to as a vehicle 700) according to the fifth embodiment is equipped with the battery 1 according to the first embodiment, and the electric energy stored in the battery 1 is used as the drive energy of the drive source. It is used as a whole or a part (see FIG. 14).

  The automobile 700 is a hybrid automobile equipped with an assembled battery 710 in which a plurality of batteries 1 are combined and driven by using an engine 740, a front motor 720, and a rear motor 730 in combination. Specifically, the automobile 700 includes an engine 740, a front motor 720 and a rear motor 730, an assembled battery 710 (battery 1), a cable 750, and an inverter 760 on the vehicle body 790. The automobile 700 is configured to be able to drive the front motor 720 and the rear motor 730 using electrical energy stored in the assembled battery 710 (battery 1).

  As described above, since the battery 1 suppresses intrusion of metal foreign matter into the battery case 10, the reliability of the automobile 700 on which the battery 1 is mounted can be increased. Instead of the battery 1 according to the first embodiment, the batteries 2, 3, and 4 according to the second to fourth embodiments may be mounted.

(Embodiment 6)
Next, a sixth embodiment will be described. A hammer drill 800 according to the sixth embodiment is a battery-using device equipped with the battery 1 according to the first embodiment (see FIG. 15). In the hammer drill 800, a battery pack 810 (battery 1) including the battery 1 is accommodated in a bottom portion 821 of a main body 820, and the battery pack 810 is used as an energy source for driving the drill.

  As described above, since the battery 1 prevents the metal foreign matter from entering the battery case 10, the reliability of the hammer drill 800 on which the battery 1 is mounted can be increased. Instead of the battery 1 according to the first embodiment, the batteries 2, 3, and 4 according to the second to fourth embodiments may be mounted.

  In the above, the present invention has been described with reference to the embodiments. However, the present invention is not limited to the above-described first to sixth embodiments, and it is needless to say that the present invention can be appropriately modified and applied without departing from the gist thereof. Yes.

  For example, in the first to fourth embodiments, the example in which the through hole 12H communicating between the inside and the outside of the battery case is used as the liquid injection hole for injecting the electrolytic solution 17 is shown, but the present invention is not limited thereto. Examples of the through hole include a vent hole for releasing a gas in the battery case generated during the manufacturing process (such as initial charge / discharge). Moreover, in Embodiment 1-4, although the through-hole 12H was provided in the case cover member 12 among the battery cases 10, the formation position of a through-hole is not restricted to this. For example, the through hole may be provided on the side surface or the bottom surface of the case main body member 11.

In the first embodiment, the battery 1 having only the hole inner peripheral surface protection member 71 is used. In the second to third embodiments, the batteries 2 and 3 including the hole inner peripheral surface protection members 72 and 73 and the outer protection members 82 and 83 are used. In the fourth embodiment, the battery 4 having the hole inner circumferential surface protection member 74 and the inner protection member 84 is exemplified, but the shapes of the hole inner circumferential surface protection member, the outer protection member, and the inner protection member are not limited thereto. I can't.
For example, three of the hole inner peripheral surface protection member, the outer protection member, and the inner protection member may be integrally formed with the case lid member 12 of the battery case 10 as a single body or separate members. In addition, the outer protective member and the inner peripheral surface protective member having a cylindrical shape longer than the through hole are integrated and formed separately from the battery case 10, and this is formed in the through hole 12 </ b> H of the battery case 10. It is good also as a form fitted from the case outer side. In this case, when the undeformed blind rivet 50 is inserted into the through-hole 12H and deformed into the deformed blind rivet 60, it jumps out from the through-hole 12H of the long cylindrical hole inner peripheral surface protection member together with the deformation. This portion is spread on the inner peripheral surface 14c so as to form an inner protective member. Therefore, it can be set as the battery which has the three of a hole inner peripheral surface protection member, an outer side protection member, and an inner side protection member.

  In the fifth embodiment, the hybrid vehicle 700 is exemplified as a vehicle on which the battery 1 according to the present invention is mounted. However, the present invention is not limited to this. Examples of the vehicle on which the battery according to the present invention is mounted include an electric vehicle, a plug-in hybrid vehicle, a hybrid railway vehicle, a forklift, an electric wheelchair, an electrically assisted bicycle, and an electric scooter.

  Moreover, although Embodiment 6 illustrated the hammer drill 800 as a battery using apparatus which mounts the battery 1 which concerns on this invention in Embodiment 6, it is not restricted to this. Examples of battery-powered devices equipped with the battery according to the present invention include personal computers, mobile phones, battery-powered electric tools, uninterruptible power supply devices, various home appliances driven by batteries, office equipment, industrial equipment, etc. Is mentioned.

1,2,3,4 Lithium ion secondary battery (sealed battery)
DESCRIPTION OF SYMBOLS 10 Battery case 11 Case main body member 12 Case cover member 13 Outer surface 14 (of battery case (case cover member)) Inner surface 12H (of battery case (case cover member)) Through-hole (injection hole)
12c Through-hole inner peripheral surface 13c Peripheral outer surface 14c Peripheral inner surface 15 Safety valve 20 Electrode body 40 Positive electrode terminal 41 Negative electrode terminal 50 Undeformed blind rivet 51 Undeformed blind rivet main body 52 Cage 53 Cylindrical part (bottomed cylindrical part)
60 Deformed blind rivet 61 Deformed rivet body 63 Shaft portion 64 Deflection caulking portions 71, 72, 73, 74 Hole inner peripheral surface protection members 82, 83 Outer protection member 84 Inner protection members 92, 93 Inner and outer hole protection members 94 Holes Inner and inner protective member

Claims (8)

A battery case made of metal and having a through-hole communicating with the inside and outside of itself;
An electrode body housed in the battery case, and
A deformed rivet body including a cylindrical shaft portion, a flange portion connected to the proximal end side of the shaft portion and having a larger diameter than the shaft portion, and a deformed crimping portion connected to the distal end side of the shaft portion and larger in diameter than the shaft portion. Have
The shaft portion is inserted into the through hole of the battery case,
The flange is caulked on the outer peripheral surface of the outer periphery of the battery case, which is the periphery of the through hole,
The deformation caulking part caulks the peripheral inner surface that is the peripheral edge of the through hole among the inner surface of the battery case,
A battery comprising a deformed blind rivet formed by hermetically sealing the through hole,
Made of resin, having a hole inner peripheral surface protection member disposed in the through hole of the battery case,
The battery in which the shaft portion of the deformed blind rivet and the battery case are separated from each other through the hole inner peripheral surface protection member in the through hole. The battery according to claim 1,
An outer protective member made of resin and disposed on the outer peripheral surface of the battery case;
The flange of the deformed blind rivet is
A battery formed by crimping the outer peripheral surface of the battery case via the outer protective member. The battery according to claim 1 or 2,
Made of resin, having an inner protective member disposed on the inner peripheral surface of the battery case,
The deformation caulking portion of the deformed blind rivet is:
A battery formed by crimping the inner peripheral surface of the battery case via the inner protective member. A battery case made of metal and having a through-hole communicating with the inside and outside of itself;
An electrode body housed in the battery case, and
A deformed rivet body including a cylindrical shaft portion, a flange portion connected to the proximal end side of the shaft portion and having a larger diameter than the shaft portion, and a deformed crimping portion connected to the distal end side of the shaft portion and larger in diameter than the shaft portion. Have
The shaft portion is inserted into the through hole of the battery case,
The flange is caulked on the outer peripheral surface of the outer periphery of the battery case, which is the periphery of the through hole,
The deformation caulking part caulks the peripheral inner surface that is the peripheral edge of the through hole among the inner surface of the battery case,
A deformed blind rivet formed by hermetically sealing the through hole,
Made of resin, having a hole inner peripheral surface protection member disposed in the through hole of the battery case,
The shaft portion of the deformed blind rivet and the battery case are a method of manufacturing a battery that is separated from each other through the hole inner peripheral surface protection member in the through hole,
The undeformed blind rivet before deforming the deformed blind rivet is
An undeformed rivet body including the flange and the bottomed cylindrical shape with the distal end closed and including the bottomed cylindrical portion that becomes the shaft portion and the deformed crimped portion after deformation;
In the state in which the bottomed cylindrical portion of the undeformed blind rivet inserted through the through hole is separated from the battery case via the hole inner peripheral surface protecting member in the through hole, the shaft portion And the manufacturing method of a battery provided with the sealing process of making it deform | transform into the said deformation | transformation crimp part and sealing the said through-hole airtightly. A method of manufacturing a battery according to claim 4,
Prior to the sealing step,
The bottomed cylindrical portion of the undeformed blind rivet is attached to the battery case while preventing contact with the inner peripheral surface of the through hole of the battery case by the hole inner peripheral surface protecting member disposed in the through hole. A method for manufacturing a battery, comprising an insertion step of inserting into the through hole from the outside. A method of manufacturing a battery according to claim 4 or claim 5, wherein
The battery is
An outer protective member made of resin and disposed on the outer peripheral surface of the battery case;
The sealing step includes
A battery manufacturing method in which the bottomed cylindrical portion of the undeformed blind rivet is deformed while preventing contact with the outer peripheral surface by the outer protective member disposed on the outer peripheral surface. It is a manufacturing method of the battery as described in any one of Claims 4-6,
The battery is
Made of resin, having an inner protective member disposed on the inner peripheral surface of the battery case,
The sealing step includes
A battery manufacturing method in which the bottomed cylindrical portion of the undeformed blind rivet is deformed while preventing contact with the inner peripheral surface by the inner protective member disposed on the inner peripheral surface. A battery manufacturing method according to claim 7,
Prior to the sealing step,
A battery manufacturing method comprising a hole inner protective member forming step of integrally forming the hole inner peripheral surface protecting member and the inner protective member on the through hole and the peripheral inner surface of the battery case.

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