JP2012186005A - Battery and battery manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery capable of preventing a foreign matter from being mixed in a battery case without increasing a number of components while insulating an electrode body and a battery case body, and a method for manufacturing such a battery.SOLUTION: A battery 1 comprises an electrode body 40; a battery case 10 enclosing the electrode body 40 and having a rectangular cylindrical battery case body 12 with a bottom, and a sealing lid 16 sealing a rectangular opening HM of the battery case body; and an insulation sheet member 20 interposed between the electrode body and the battery case body. An opposed spacing S is formed on the battery case between an opening 13 of the battery case body and a peripheral edge 17 of the sealing lid, and the battery case has a welding part 11 formed by welding the opening and the peripheral edge. The opening includes an inner opening 13X faced to an inner spacing part SX of the opposed spacing, and the peripheral edge includes an inner peripheral edge 17X opposed to the inner opening 13X. The inner opening and the inner peripheral edge are pressure-welded via a sheet extension part 21 of the insulation sheet member at one part of the sealing lid in its peripheral direction.

Description

  The present invention relates to an electrode body, a rectangular box made of metal, a battery case having a battery case body and a sealing lid, an insulating resin sheet, and an insulating sheet member interposed between the electrode body and the battery case body. The battery case has a welded portion in which the battery case is hermetically welded between the battery case body and the sealing lid, and a method for manufacturing the battery.

In recent years, a chargeable / dischargeable battery has been used as a driving power source for vehicles such as hybrid vehicles and electric vehicles, and portable electronic devices such as notebook computers and video camcorders.
As such a battery, a rectangular battery having a rectangular box-shaped battery case made of metal is known. In this rectangular battery, an insulating sheet member made of an insulating resin sheet is interposed between the electrode body and the battery case body in order to insulate the electrode body housed in the battery case from the battery case body. Batteries are also known.
On the other hand, in Patent Document 1, when joining a container main body (battery case main body) and a lid material (sealing lid) using a brazing material, a resin inner is formed on a portion of the lid material to be fitted into the container main body. A method of joining an aluminum battery case with a sticker is disclosed. According to this technique, since the inner seal is interposed between the container main body and the lid member, it is possible to prevent foreign matter (such as a brazing material) from entering the inside of the battery case that houses the electrode body.

JP-A-11-67161

  However, in the technique of Patent Document 1, it is necessary to prepare an inner seal to be attached to the lid member (sealing lid) separately from the sealing lid, and the number of parts increases accordingly.

  The present invention has been made in view of such a problem, and while preventing insulation between the electrode body and the battery case main body, the mixture of foreign matters into the battery case without increasing the number of parts, And it aims at providing the manufacturing method of such a battery.

  One aspect of the present invention is a rectangular box-shaped battery case in which an electrode body and the electrode body are housed, and a rectangular bottomed cylindrical battery case body made of metal and capable of housing the electrode body And a battery case made of metal and having a rectangular plate-like sealing lid for sealing the rectangular opening of the battery case body, and an insulating resin sheet, interposed between the electrode body and the battery case body And an insulating sheet member that insulates the battery case, and the battery case forms an opposing gap between the opening part of the battery case body and the peripheral part of the sealing lid. And a battery having a welded portion formed by hermetically welding the opening and the peripheral edge from the outside over the entire circumference of the peripheral edge, wherein the opening of the battery case body is Of the facing gap, the above weld Also includes an inner opening facing the inner gap located inside the battery case, and the peripheral edge of the sealing lid faces the inner gap of the opposing gap and faces the inner opening. The inner opening and the inner peripheral edge include a peripheral edge, and at least a part of the insulating sheet member extends toward the sealing lid in at least a portion of the sealing lid in the circumferential direction. It is a battery formed by pressure contact.

  In the battery described above, since the sheet extending portion of the insulating sheet member is interposed between the inner opening of the battery case main body and the inner peripheral edge of the sealing lid, the electrode member and the battery case main body are separated by the insulating sheet member. It is possible to prevent foreign matter from entering the battery case from at least a portion where the sheet extending portion of the insulating sheet member is interposed, without increasing the number of components while insulating between the two.

As the electrode body, for example, a wound-type electrode body in which a strip-like positive electrode plate and a negative electrode plate are wound around an axis via a separator, and a plurality of positive electrode plates and a plurality of negative electrode plates are provided. And a laminated electrode body that is alternately laminated via separators. Of these, examples of the shape of the wound electrode body include a cylindrical shape and a flat long cylindrical shape.
Examples of the material of the insulating sheet member include materials that are not easily swollen or attacked by the electrolyte solution, such as polypropylene (PP), polyethylene (PE), and tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer (PFA). .

  Furthermore, in the battery described above, the inner opening is an inward inner opening that is rectangular and faces radially inward of the opening, and includes a pair of short-side inner openings that form a short side of the rectangle. The inner peripheral edge portion is an outward inner peripheral edge portion that is rectangular and faces the radially outer side of the sealing lid, and includes a pair of short inner inner peripheral edge portions that form short sides of the rectangle, and the inward inner opening portion. And the outward inner peripheral edge may be a battery formed by pressure contact between the short side inner opening and the short side inner peripheral edge via the sheet extending portion of the insulating sheet member. .

By the way, in manufacturing a battery including a rectangular box-shaped battery case made of metal, when sealing the opening of the battery case body with the sealing lid, the sealing lid is inserted into the opening of the battery case body, and then the battery case body and There is what welds a sealing lid. At that time, in the long side direction of the opening, a sealing lid having a size larger than the inner dimension of the opening is press-fitted into the opening of the battery case body, and the sealing lid is pressed into the battery case body in the longitudinal direction within the opening to The lid may be held on the battery case body.
However, when an attempt is made to arrange the sealing lid in the opening of the battery case body in this way, a portion of the inner opening of the battery case body that forms the short side of the opening (short side inner opening) and the sealing lid Among the inner peripheral edge portions, contact and rubbing with a portion forming the short side (short side inner peripheral edge portion), there is a possibility that metal foreign matter is generated from the sealing lid or the battery case body and enters the battery case.

  On the other hand, in the above-described battery, the inward inner opening and the outward inner peripheral edge are between the short inner opening and the shorter inner peripheral edge, respectively, via the sheet extending portion of the insulating sheet member. And press contact. For this reason, even when the sealing lid is press-fitted into the opening of the battery case body, the seal extending portion is interposed, so that the short side inner opening and the short side inner peripheral edge come into contact with each other, and the metal foreign matter is rubbed. It can be prevented from occurring. Further, even when a metal foreign matter is generated, the sheet extending portion can prevent the metal foreign matter from entering the battery case from between the short side inner opening and the short side inner peripheral edge.

  Further, in the battery described above, the inwardly-facing inner opening includes a pair of long-side inner openings that form the long sides of the opening, and the outward-facing inner peripheral edge forms the long side of the sealing lid. A pair of long side inner peripheral edges are included, and the sealing lid is fitted into the opening of the battery case main body in a form in which the long side inner peripheral edge is a clearance fit with respect to the long side inner opening. It is better to use

  In the battery described above, the opening of the battery case body and the sealing lid have a gap fit between the long side inner opening and the long side inner peripheral edge. For this reason, during manufacturing, the sealing lid can be inserted into the opening of the battery case main body without contacting and rubbing between the long side inner opening and the long side inner peripheral edge, so that metal foreign matter is generated from these. hard. Therefore, a battery in which foreign matter is prevented from entering the battery case can be obtained.

  Another aspect of the present invention is a rectangular box-shaped battery case containing an electrode body and the above-mentioned electrode body, which is made of metal and can accommodate the above-mentioned electrode body. A battery case comprising a main body and a rectangular plate-like sealing lid made of metal and sealing a rectangular opening of the battery case main body; and an insulating resin sheet, the electrode body being interposed between the battery case main body and the battery case main body. An insulating sheet member that interposes and insulates the battery case, and the battery case has an opposing gap between the opening part of the battery case body and the peripheral part of the sealing lid. And has a welded portion formed by airtightly welding the opening and the peripheral edge from the outside over the entire circumference of the peripheral edge, and the opening of the battery case body has the opposing gap. Of which, the battery than the weld An inner opening facing the inner gap located inside the sleeve, and the peripheral edge of the sealing lid faces the inner gap of the opposing gap and faces the inner opening The inner opening and the inner peripheral edge are formed through a sheet extending portion in which a part of the insulating sheet member extends toward the sealing lid in at least a part of the sealing lid in the circumferential direction. A method of manufacturing a battery by pressure welding, wherein a pre-weld sealing lid is disposed in the opening of the pre-weld case body, and the pre-weld opening portion and the pre-weld sealing lid are welded. A front gap is formed between the front opening and the front peripheral edge, and the inner opening and the inner peripheral edge are arranged at least in the circumferential direction of the pre-weld sealing lid. A pressure-welding process for pressure-contacting through the existing part; In the state where the inner opening and the inner peripheral edge are in pressure contact with each other, the outer opening facing the portion outside the inner gap in the pre-welding facing gap of the opening before welding, Welding that welds the outer peripheral edge facing the outer opening, facing the outer portion of the pre-welding counter gap, from the outside over the entire circumference of the pre-welding peripheral edge. And a process for producing a battery.

  Since the above-described battery manufacturing method includes the above-described pressure contact process and welding process, at least the sheet extension of the insulating sheet member is performed without increasing the number of parts while performing insulation between the electrode body and the battery case body. A battery in which foreign matter is prevented from entering the battery case from the portion where the portion is interposed can be manufactured.

  Further, in the battery manufacturing method described above, the inner opening is an inward inner opening that is rectangular and faces the inner side in the radial direction of the opening, and a pair of short side inner openings that form a short side of the rectangle. The inner peripheral edge is an outwardly facing inner peripheral edge that is rectangular and faces the radially outer side of the sealing lid, includes a pair of short side inner peripheral edges that form a short side of the rectangle, and A battery in which the inner opening and the outward inner peripheral edge are in pressure contact with each other via the sheet extending portion of the insulating sheet member between the shorter inner opening and the shorter inner peripheral edge. It is good to use this manufacturing method.

In the battery manufacturing method described above, the inward inner opening of the battery case main body and the outward inner peripheral edge of the sealing lid are respectively formed between the short side inner opening and the short side inner peripheral edge of the insulating sheet member. It is press-contacted via the sheet extension part. For this reason, in the press-contacting process, the short side inner opening and the short side inner peripheral edge come into contact with each other and are prevented from being rubbed to produce a metal foreign object, whereby a battery can be manufactured.
In addition, even if a metal foreign object occurs, the metal foreign object is prevented from entering the battery case from between the short side inner opening and the short side inner peripheral edge by the sheet extending portion of the insulating sheet member. A battery can be manufactured.
Furthermore, the inner opening is an inward inner opening that faces the radially inner side of the opening, and the inner peripheral edge is an outward inner peripheral edge that faces the radially outer side of the sealing lid located in the opening. For this reason, since a short side inner side opening part and a short side inner periphery peripheral part can maintain the state which became independent and press-contacted, without requiring the force from the outside at the time of welding, welding is easy.

It is a perspective view of the battery concerning embodiment and modification 1,3. It is a top view of the battery concerning embodiment and modification 1, 3. FIG. It is the elements on larger scale in the AA arrow cross section of FIG. 2 of the battery concerning embodiment. It is the elements on larger scale in the BB arrow cross section of FIG. 2 of the battery concerning embodiment and modification 1,3. It is an expanded sectional view (C section of Drawing 3) of the battery concerning an embodiment. It is a perspective view of an insulating sheet member of an embodiment and modification 1-6. It is a perspective view of the sealing lid before welding used for the manufacturing method of the battery concerning embodiment and modification 1-6. It is a perspective view of the case main body before welding used for the manufacturing method of the battery concerning embodiment and modification 1-6. It is explanatory drawing of a press-contact process among the manufacturing methods of the battery concerning Embodiment and the modification 1,2. It is explanatory drawing which shows the state concerning the embodiment and modification 1, and having inserted the sealing lid before welding in opening of the case main body before welding. It is explanatory drawing (D-D arrow partial expanded sectional view of FIG. 10) which shows the state which concerns on embodiment and the sealing lid before welding press-contacts with the case main body before welding via an insulating sheet member. It is explanatory drawing (E-E arrow sectional drawing of FIG. 10) which shows a mode that it has applied the embodiment and modification 1, and has produced the clearance gap between the sealing lid before welding and the case main body before welding. It is explanatory drawing of a welding process among the manufacturing methods of the battery concerning Embodiment and the modification 1. FIG. FIG. 3 is a partially enlarged cross-sectional view of the battery according to the first modification, taken along the line AA in FIG. 2. It is a perspective view of the battery concerning modification 2, 4-6. It is a top view of the battery concerning modification 2, 4-6. It is the elements on larger scale in the FF arrow cross section of FIG. 16 of the battery concerning the modification 2. FIG. It is explanatory drawing of a welding process among the manufacturing methods of the battery concerning the modification 2, 4-6. It is the elements on larger scale in the AA arrow cross section of FIG. 2 of the battery concerning the modification 3. FIG. It is the elements on larger scale in the FF arrow cross section of FIG. 16 of the battery concerning the modification 4. FIG. It is the elements on larger scale in the FF arrow cross section of FIG. 16 of the battery concerning the modification 5. FIG. It is the elements on larger scale in the FF arrow cross section of FIG. 16 of the battery concerning the modification 6. FIG.

(Embodiment)
Next, embodiments of the present invention will be described with reference to the drawings.
First, the battery 1 according to the present embodiment will be described with reference to FIGS.
The battery 1 is a lithium ion secondary battery including a flat long cylindrical electrode body 40, a rectangular box-shaped battery case 10, and a bag-shaped insulating sheet member 20 made of an insulating resin sheet (FIG. 1). reference).

  Among these, the electrode body 40 is a wound electrode body in which a belt-like positive electrode plate 41 and a negative electrode plate 42 are wound into a flat shape via a belt-like separator 43 (see FIG. 1). In the electrode body 40, the positive electrode plate 41 and the negative electrode plate 42 face each other with the separator 43 interposed therebetween. Further, the positive electrode plate 41 and the negative electrode plate 42 of the electrode body 40 are respectively joined to a plate-like positive electrode current collector 91 or a negative electrode current collector 92 bent in a crank shape (see FIG. 1).

A strip-shaped separator 43 made of polyethylene is interposed between the positive electrode plate 41 and the negative electrode plate 42 to separate them. The separator 43 is entirely impregnated with an electrolytic solution (not shown). In addition, this electrolyte solution was prepared by mixing ethylene carbonate (EC), ethyl methyl carbonate (EMC), and dimethyl carbonate (DMC) in a mixed organic solvent prepared at a volume ratio of EC: EMC: DMC = 1: 1: 1. It is a non-aqueous electrolyte in which LiPF ₆ is added as a solute and the concentration of lithium ions is 1 mol / l.

The positive electrode plate 41 has a strip-shaped aluminum foil (not shown) and two strip-shaped positive electrode active material layers (not shown) formed on both main surfaces of the aluminum foil. Among them, the positive electrode active material layer is made of a positive electrode active material particle made of LiNi _1/3 Co _1/3 Mn _1/3 O ₂ , a conductive material made of acetylene black, and a binder made of polyvinylidene fluoride (PVDF). Including.

  On the other hand, the negative electrode plate 42 has a strip-shaped copper foil (not shown) and two strip-shaped negative electrode active material layers (not shown) formed on both main surfaces of the copper foil. Of these, the negative electrode active material layer includes negative electrode active material particles made of natural graphite and a binder made of carboxymethylcellulose (CMC).

The battery case 10 in which the electrode body 40 described above is housed includes an aluminum battery case body 12 and a sealing lid 16, and a welded portion 11 formed by welding the battery case body 12 and the sealing lid 16. (See FIGS. 1 and 2).
Among these, the battery case main body 12 is a rectangular bottomed cylinder shape which can accommodate the whole electrode body 40 (refer FIG. 1, 2). Specifically, the battery case main body 12 includes a rectangular plate-shaped bottom portion 12G positioned below in FIG. 1 and two flat plate-like shapes that rise vertically from short edges of the four sides of the bottom portion 12G. It consists of first wall portions 12H, 12H and two plate-like second wall portions 12J, 12J that rise vertically from the long edge of bottom portion 12G. Moreover, this battery case main body 12 has the opening part 13 which makes the rectangular-shaped opening HM (refer FIGS. 2-5).

On the other hand, the sealing lid 16 has a rectangular plate shape and is located in the opening HM of the battery case body 12 to seal the opening HM (see FIGS. 1 and 2). In addition, the sealing lid 16 has a peripheral edge portion 17 that forms the four edges of the sealing lid 16 (see FIG. 2).
The sealing lid 16 includes a positive electrode terminal portion 91A and a negative electrode terminal portion 92A, which are located on the tip side of the positive electrode current collecting member 91 and the negative electrode current collecting member 92 connected to the electrode body 10, respectively. It penetrates the lid 16 and protrudes from the lid surface 16a facing upward in FIG. Further, an insulating member 95 made of an insulating resin is interposed between the positive electrode terminal portion 91A and the negative electrode terminal portion 92A and the sealing lid 16 to insulate them. Further, a rectangular plate-shaped safety valve 97 is also sealed on the sealing lid 16.

As shown in FIGS. 3 to 5, in the battery case 10, a facing gap S is formed between the opening 13 of the battery case body 12 and the peripheral edge 17 of the sealing lid 16. Moreover, the part located inside the battery case 10 rather than the welding part 11 among this opposing gap S is made into the inner side gap part SX (refer FIGS. 3-5).
The opening 13 of the battery case body 12 and the peripheral edge 17 of the sealing lid 16 include an inner opening 13X and an inner peripheral edge 17X respectively facing the inner facing gap SX (FIG. 3). 5).

Further, the inner opening 13X of the battery case body 12 includes two short-side inner openings 13XA and 13XA that form a short side of the opening HM, and two long-side inner openings that form a long side of the opening HM. It consists of parts 13XB and 13XB (see FIGS. 3 to 5). In addition, the inner opening 13X is an inward inner opening that faces the radially inner side of the rectangular opening HM (from the left side to the right side in FIG. 5) in the battery case body 12.
On the other hand, the inner peripheral edge portion 17X of the sealing lid 16 includes two short side inner peripheral edge portions 17XA and 17XA that form the short side edge of the sealing lid 16, and two long side inner peripheral edge portions that form the long side edge of the sealing lid 16. 17XB and 17XB (see FIGS. 3 to 5). Further, the inner peripheral edge portion 17X is an outward inner peripheral edge portion facing the radially outer side (in FIG. 5, from the right side to the left side) in the sealing lid 16.

  Further, as shown in FIG. 2, the welded portion 11 of the battery case 10 is formed in a rectangular ring shape between the battery case main body 12 and the sealing lid 16. As shown in FIGS. 4 and 5, the welded portion 11 includes an inner opening 13 </ b> X (short side inner opening 13 </ b> XA, long side inner opening 13 </ b> XB) of the battery case body 12 and a sealing lid 16. It is adjacent to the inner peripheral edge portion 17X (short side inner peripheral edge portion 17XA, long side inner peripheral edge portion 17XB). The welded portion 11 includes an outer opening 13Y in a pre-weld opening 13F of a pre-weld case body 12F, which will be described later, and an outer peripheral edge 17Y in a pre-weld peripheral edge 17F of a pre-weld sealing lid 16F. To the peripheral edge 17 (peripheral peripheral edge 17F before welding) is formed by air-tight welding.

As shown in FIG. 1, an insulating sheet member 20 made of a polypropylene (PP) sheet having a thickness of 0.05 mm is provided between the electrode body 40 described above and the battery case body 12 of the battery case 10. The both are insulated by interposing.
As shown in FIG. 6, the insulating sheet member 20 has a rectangular bottomed cylindrical sheet main body 22 that can accommodate the electrode body 40, and partially extends upward from the sheet main body 22 in FIG. 6. And two sheet extending portions 21 and 21. Among these, the sheet main body portion 22 includes a rectangular plate-like sheet bottom portion 22G positioned below in FIG. 6 and two flat plate-like second plates that vertically rise from short edges of the four sides of the sheet bottom portion 22G. 1 sheet wall part 22H, 22H and 2nd sheet | seat 2nd wall part 22J and 22J of the flat form which stand | start up perpendicularly from the long side edge of the sheet | seat bottom part 22G. Moreover, the sheet | seat extension part 21 is a site | part which each extends upwards in FIG. 6 from two 1st sheet | seat wall parts 22H and 22H among these.

  Further, the sheet main body portion 22 of the insulating sheet member 20 is disposed so as to contact the inside of the battery case main body 12 described above. That is, the sheet bottom 22G of the sheet body 22 is on the bottom 12G of the battery case body 12, the first sheet wall 22H of the sheet body 22 is on the first wall 12H of the battery case body 12, and the second of the sheet body 22 is on. The two sheet wall portions 22J are in contact with the second wall portion 12J of the battery case body 12 from the inside of the battery case body 12 (see FIG. 1).

  In addition, in the battery 1 according to the present embodiment, as shown in FIG. 5, a typical gap t1 (short side inner opening 13XA and the short side inner opening 13XA) generated between the short side inner opening 13XA and the short side inner peripheral edge 17XA. Half of the dimensional difference with the short side inner peripheral edge portion 17XA) is made smaller than the thickness (0.05 mm) of the insulating sheet member 20. Thereby, the short side inner side opening part 13XA in the inner side opening part 13X of the battery case main body 12 and the short side inner side edge part 17XA in the inner side peripheral edge part 17X of the sealing lid 16 are the sheet extending parts 21 of the insulating sheet member 20. Is in pressure contact. Thus, in the battery 1, the sheet extending portion 21 is interposed between the short side inner opening 13 </ b> XA and the short side inner peripheral edge 17 </ b> XA, and thus does not communicate with the battery case 10.

  On the other hand, in the battery 1, as shown in FIG. 4, the battery case 10 includes a long side inner opening 13 </ b> XB in the inner opening 13 </ b> X of the battery case main body 12 and a long side inner periphery in the inner peripheral edge 17 </ b> X of the sealing lid 16. It is slightly separated from the portion 17XB. That is, a slight gap (the above-described inner gap SX) is generated between the long side inner opening 13XB and the long side inner peripheral edge 17XB. As will be described later, this is a form in which the long side inner peripheral edge portion 17XB and the long side inner peripheral opening portion 13XB are fitted into the opening HM of the battery case main body 12 so that the pre-weld sealing lid 16F is attached to the pre-weld case main body. This is because it fits into the opening HM of 12F.

  In the battery 1 according to this embodiment, the sheet extending portion 21 of the insulating sheet member 20 includes the inner opening portion 13X (short side inner opening portion 13XA) of the battery case body 12 and the inner peripheral edge portion 17X ( It is interposed between the short side inner peripheral edge portion 17XA). For this reason, while insulating between the electrode body 40 and the battery case main body 12 with the insulating sheet member 20, without increasing the number of parts, at least a portion where the sheet extending portion 21 of the insulating sheet member 20 is interposed ( It is possible to prevent foreign matter from entering the battery case 10 from between the short side inner opening 13XA and the short side inner peripheral edge 17XA.

  In the battery 1, the inner opening 13 </ b> X and the inner peripheral edge 17 </ b> X are respectively interposed between the short-side inner opening 13 </ b> XA and the short-side inner peripheral edge 17 </ b> XA via the sheet extending portion 21 of the insulating sheet member 20. And press contact. For this reason, also when the sealing lid 16 is press-fitted into the opening HM of the battery case body 12, the seal extending portion 21 is interposed, so that the short side inner opening 13XA and the short side inner peripheral edge 17XA come into contact with each other. It is possible to prevent metal foreign matter from being rubbed. Further, even when a metal foreign matter is generated, the sheet extending portion 21 can prevent the metal foreign matter from entering the battery case from between the short side inner opening 13XA and the short side inner peripheral edge portion 17XA. .

  In the battery 1, the opening HM of the battery case main body 12 and the sealing lid 16 have a gap fit between the long-side inner opening 13 </ b> XB and the long-side inner peripheral edge 17 </ b> XB. For this reason, since the sealing lid 16 can be inserted into the opening HM of the battery case body 12 without making contact and rubbing between the long side inner opening 13XB and the long side inner peripheral edge 17XB at the time of manufacture. Hard to generate metal foreign matter. For this reason, it can be set as the battery 1 which suppressed mixing of the foreign material in the battery case 10. FIG.

Next, a method for manufacturing the battery 1 according to the present embodiment will be described with reference to FIGS.
First, the positive electrode plate 41 forming the electrode body 40 is produced. Specifically, a paste (not shown) made by kneading positive electrode active material particles, a binder and a conductive agent in a solvent is applied to both main surfaces of a strip-shaped aluminum foil (not shown), and then The paste was dried. The paste was applied to both main surfaces of the aluminum foil, with one side edge side in the width direction of the aluminum foil being formed in a strip shape.
Furthermore, the paste dried on both main surfaces of the aluminum foil was compressed with a roll press (not shown) to produce the positive electrode plate 41.

On the other hand, the negative electrode plate 42 is produced. Specifically, a paste (not shown) made by kneading negative electrode active material particles and a binder in a solvent is applied to both main surfaces of a strip-shaped copper foil (not shown), and then the paste is dried. I let you. The paste was applied to both main surfaces of the copper foil, with one side edge side in the width direction of the copper foil being formed in a strip shape.
Furthermore, the paste dried on both main surfaces of the copper foil was compressed with a roll press (not shown) to produce the negative electrode plate 42.

  Subsequently, the positive electrode plate 41 and the negative electrode plate 42 manufactured as described above are wound into a cylindrical shape together with the two strip-shaped separators 43 and 43 described above, and then the side surface (cylindrical surface) is crushed from the outside to be flattened. A long cylindrical electrode body 40 was manufactured (see FIG. 1).

Next, the pressing process in the method for manufacturing the battery 1 according to the present embodiment will be described.
In this pressure welding process, the sealing lid 16F before welding and the case main body 12F before welding are used. Among these, the sealing lid 16F before welding is a rectangular plate shape as shown in FIG. 7, and has the peripheral edge part 17F before welding which makes the edge of four sides of itself. In the present embodiment, the positive electrode current collecting member 91 and the negative electrode current collecting member 92 are previously penetrated and fixed to the sealing lid 16F before welding through the insulating member 95 (see FIG. 7).
On the other hand, the pre-weld case body 12F has a rectangular bottomed cylindrical shape as shown in FIG. 8, and has a pre-weld opening 13F that forms a rectangular opening HM.

  Prior to the pressure welding process, a sealing lid processing process is performed. In this sealing lid processing step, the electrode body 40 is joined (welded) to the positive current collecting member 91 and the negative current collecting member 92 penetrating the sealing lid 16F before welding by a known method. And the circumference | surroundings of the electrode body 40 united with the sealing lid 16F before welding are covered with the insulating sheet member 20 mentioned above (refer FIG. 9). Specifically, the entire electrode body 40 is accommodated in the sheet main body portion 22 of the insulating sheet member 20. At this time, a part of the sheet bottom 22G of the sheet main body 22 and the electrode body 40 are bonded.

Next, a pressure contact process is performed. That is, the electrode body 40 covered with the insulating sheet member 20 is inserted into the pre-weld case body 12F, and the pre-weld sealing lid 16F is disposed in the opening HM of the pre-weld case body 12F (see FIG. 9).
At that time, in the long side direction of the opening HM, the sealing lid 16F before welding having a size larger than the inner size of the opening HM is press-fitted into the opening HM of the case main body 12F before welding. Specifically, as shown in FIG. 9, force F1 is applied from both sides in the longitudinal direction of the opening HM to the peripheral edge 17F before welding of the pre-weld case body 12F to temporarily set the inner dimension in the short direction of the opening HM. Make it bigger. By doing in this way, the site | part (long side inner side opening part 13XB and the long side outer side opening part 13YB mentioned later) which makes the long side among the opening parts 13F before welding of the case main body 12F before welding, and the sealing before welding The sealing lid 16F before welding is placed in the opening HM without contacting the long side portions (long side inner peripheral edge portion 17XB and long side outer peripheral edge portion 17YB described later) of the peripheral edge portion 17F before welding of the lid 16F. Can be arranged.

  FIG. 10 shows a top view of the pre-weld sealing lid 16F and the pre-weld case body 12F after the pre-weld sealing lid 16F is disposed in the opening HM. In the short direction of the opening HM, a slight gap is generated between the sealing lid 16F before welding and the case main body 12F before welding.

The relationship between the pre-weld case body 12F and the pre-weld sealing lid 16F will be further described with reference to FIGS.
As shown in FIG. 11, which is a partially enlarged view of the DD cross section of FIG. 10, the pre-weld opening 13F of the pre-weld case body 12F and the pre-weld peripheral edge 17F of the pre-weld sealing lid 16F are between them. , A pre-welding facing gap SF is formed in which both faces each other. The pre-welding facing gap SF has an outer gap portion SY positioned outside the inner gap portion SX in addition to the inner gap portion SX described above (see FIG. 11).

Further, as shown in FIG. 11, the pre-weld opening 13F of the pre-weld case main body 12F has an outer gap portion in addition to the short side inner opening 13XA of the inner opening 13X described above, which forms the short side of the opening HM. It has a short side outer opening 13YA of the outer opening 13Y facing SY. Further, as shown in FIG. 11, the pre-weld peripheral edge 17F of the pre-weld sealing lid 16F forms the short side of the pre-weld sealing lid 16F. In addition to the short side inner peripheral edge 17XA of the inner peripheral edge 17X described above, It has a short side outer peripheral edge 17YA of an outer peripheral edge 17Y that faces the outer gap SY and faces the outer opening 13Y.
In addition, short side outer side opening part 13YA faces the inner side in the radial direction (left side to right side in FIG. 11) of rectangular opening HM in the case main body 12F before welding, like short side inner side opening part 13XA. It is an opening. Further, the short-side outer peripheral edge portion 17YA is outwardly outward facing the radially outer side (right side to left side in FIG. 11) of the pre-weld sealing lid 16F in the pre-weld sealing lid 16F, similarly to the short-side inner peripheral edge portion 17XA. It is a peripheral part.

On the other hand, as shown in FIG. 12 which is a partially enlarged view of the EE cross section of FIG. 10, the pre-weld opening portion 13F of the pre-weld case body 12F is the long side of the opening HM and the inner opening portion 13X described above. In addition to the long side inner opening 13XB, a long side outer opening 13YB of the outer opening 13Y facing the outer gap SY is provided. Further, as shown in FIG. 12, the pre-weld peripheral edge 17F of the pre-weld sealing lid 16F is the long side inner peripheral edge 17XB of the inner peripheral edge 17X described above, which forms the long side of the pre-weld sealing lid 16F. It has a long side outer peripheral edge 17YB of the outer peripheral edge 17Y that faces the outer gap SY and faces the outer opening 13Y.
The long-side outer opening 13YB faces the inner side in the radial direction of the rectangular opening HM (in FIG. 12, from the outer side in the left-right direction) in the same manner as the long-side inner opening 13XB in the case body 12F before welding. This is the outward opening. Further, the long side outer peripheral edge portion 17YB faces the outer side in the radial direction of the pre-weld sealing lid 16F (from the inner side in the left-right direction in FIG. 12) to the outer side in the pre-weld sealing lid 16F. It is a direction outer periphery part.

Subsequently, a welding process is demonstrated among the manufacturing methods of the battery 1 concerning this embodiment.
In this welding process, the outer opening 13Y and the pre-weld peripheral edge of the pre-weld opening 13F in a state in which the short-side inner opening 13XA and the short-side inner peripheral edge 17XA are press-contacted after the above-described press-contacting process. The outer peripheral edge portion 17Y of 17F is air-tightly welded from the outside over one circumference of the pre-welding peripheral edge portion 17F. Specifically, the short side outer opening 13YA and the short side outer peripheral edge 17YA, and the long side outer opening 13YB and the long side outer peripheral edge 17YB are each irradiated with YAG laser light LB and welded (FIG. 13). reference).
When welding the long side outer opening 13YB and the long side outer peripheral edge 17YB, as shown in FIG. 13, from the both sides in the short direction of the opening HM with respect to the pre-welding peripheral edge 17F of the case body 12F before welding. A force F2 is applied to reduce the gap between the long side outer opening 13YB and the long side outer peripheral edge 17YB. If it does in this way, long side outer side opening part 13YB and long side outer side peripheral part 17YB can be welded more reliably.

  After the above-described welding process, an electrolyte solution (not shown) is injected into the battery case, and the safety valve 97 is sealed on the lid surface 16a of the sealing lid 16 to complete the battery 1 (see FIG. 1).

  As mentioned above, in the manufacturing method of the battery 1 concerning this embodiment, the press-contact process and welding process which were mentioned above are provided. For this reason, while insulating between the electrode body 40 and the battery case main body 12, without increasing the number of parts, the portion where the sheet extending portion 21 of the insulating sheet member 20 is interposed (the short side inner opening portion 13XA). And the short side inner peripheral edge portion 17XA), the battery 1 in which foreign matter is prevented from entering the battery case 10 can be manufactured.

Further, in this manufacturing method, the inner opening portion 13X of the battery case body 12 and the inner peripheral edge portion 17X of the sealing lid 16 are respectively formed between the short side inner opening portion 13XA and the short side inner peripheral edge portion 17XA. It is press-contacted via 20 sheet extending portions 21. For this reason, in the press-contacting process, the short side inner opening 13XA and the short side inner peripheral edge 17XA come into contact with each other, and the battery 1 can be manufactured by preventing the metal foreign matter from being rubbed.
Even if a metal foreign matter is generated, the metal foreign matter enters the battery case 10 from between the short side inner opening 13XA and the short side inner peripheral edge 17XA due to the interposition of the sheet extending portion 21 of the insulating sheet member 20. It is possible to manufacture the battery 1 that is prevented from entering.

  Furthermore, the inner opening 13X is an inward inner opening that faces the inner side in the radial direction of the opening HM, and the inner peripheral edge 17X is an outer inner peripheral edge that faces the outer side in the radial direction of the sealing lid 16 located in the opening HM. For this reason, the short-side inner opening 13XA and the short-side inner peripheral edge 17XA can be kept in a self-standing and pressure-contact state without requiring external force during welding, so that welding is easy. .

(Modification 1)
Next, the battery according to the first modification of the present invention will be described with reference to FIGS. 1, 2, 4, 6 to 10, and 12 to 14. Note that the battery 101 according to the first modification differs from that of the battery 1 according to the above-described embodiment in the shapes of the battery case body (case body before welding) and the sealing lid (sealing lid before welding).
That is, in the battery case body 112 in the battery 101, the short side inner opening 113XA of the inner opening 113X is closer to the sealing lid 116 than the welded portion 11 in the radial direction of the opening HM (from left to right in FIG. 14). It has a shape that protrudes.
On the other hand, the sealing lid 116 has a shape in which the short side inner peripheral edge portion 117XA of the inner peripheral edge portion 117X enters the inner side in the radial direction of the sealing lid 116 itself (from the left side to the right side in FIG. 14). .
The short side inner opening 113XA of the battery case main body 112 and the short side inner peripheral edge 117XA of the sealing lid 116 are between the short side inner opening 113XA and the short side inner peripheral edge 117XA, as in the embodiment. The insulating sheet member 20 is in pressure contact with the sheet extending portion 21 interposed therebetween (see FIG. 14).

Further, regarding the pre-weld sealing lid 116F used in the pressure welding step in the manufacturing method of the battery 101, the short-side outer peripheral edge 117YA (indicated by the broken line in FIG. 14) of the outer peripheral edge 117Y of the pre-weld peripheral edge 117F. The portion shown in the figure is a shape protruding in the radial direction of the pre-weld sealing lid 116F from the short side inner peripheral edge portion 117XA toward the pre-weld case body 112F (from the right side to the left side in FIG. 14).
On the other hand, for the case body 112F before welding, the short side inner opening 113XA is arranged in the radial direction of the opening HM in the short side outer opening 113YA (the broken line in FIG. 14) of the outer openings 113Y of the pre-weld opening 113F. ) From the sealing lid 116F before welding (in FIG. 14, from the right side to the left side).

  In the pressure welding step, the sealing lid 116F before welding is press-fitted into the opening HM of the case main body 112F before welding in the same manner as in the embodiment. In this way, the short-side inner opening 113XA of the pre-weld case body 112F and the short-side inner peripheral edge 117XA of the pre-weld sealing lid 116F are combined with the short-side inner opening 113XA and the short-side inner peripheral edge as in the embodiment. The sheet extending portion 21 of the insulating sheet member 20 is interposed and pressed between the portion 117XA.

(Modification 2)
Next, a battery according to Modification 2 of the present invention will be described with reference to FIGS. It should be noted that the battery 201 according to the second modification has a battery case body (pre-weld case main body) and a sealing lid (pre-weld sealing lid) having the shapes of the battery 1 of the embodiment and the battery 101 of the first modification. And different.

That is, in the battery case body 212 in the battery 201, the short side inner side opening 213XA of the inner side opening 213X is closer to the sealing lid 116 than the welded portion 211 in the radial direction of the opening HM (from left to right in FIG. 17). It has a shape that protrudes.
On the other hand, the peripheral edge portion of the sealing lid 216 has a shape in which the short side inner peripheral edge portion 217XA of the inner peripheral edge portion 217X enters the radial inner side (left side to right side in FIG. 17) of the sealing lid 216 itself. Has been.

Note that the short side inner opening 213XA of the battery case body 212 and the short side inner peripheral edge 217XA of the sealing lid 216 are the same as in the embodiment and the first modification, but the short side inner opening 213XA and the short side inner peripheral edge 217XA. The sheet extending portion 21 of the insulating sheet member 20 is interposed between and in pressure contact with each other (see FIG. 17).
Further, the battery 201 is different from the embodiment and the modified embodiment 1 in which the welded portion 11 is located on the upper surface of the battery case 10 in that the welded portion 211 is located on the side surface of the battery case 210 (see FIG. 15). ).

Further, for the pre-weld sealing lid 216F used in the pressure welding step in the manufacturing method of the battery 201, the short-side outer peripheral edge 217YA (shown by a broken line in FIG. 17) of the outer peripheral edge 217Y of the pre-welding peripheral edge 217F. The part) has a shape protruding in the radial direction of the pre-weld sealing lid 216F from the short side inner peripheral edge 217XA toward the pre-weld case body 212F (from the right side to the left side in FIG. 17).
On the other hand, in case body 212F before welding, short side outside opening 213YA (portion indicated by a broken line in FIG. 17) of outside opening 213Y of opening 213F before welding is the short side outside periphery of pre-welding periphery 217F. The portion 217YA is located below in FIG.

In the press-contacting process, the sealing lid 216F before welding is press-fitted into the opening HM of the case main body 212F before welding in the same manner as in the embodiment. In this way, the short-side inner opening 213XA of the pre-weld case body 212F and the short-side inner peripheral edge 217XA of the pre-weld sealing lid 216F are made into the short-side inner opening 213XA, as in the embodiment and the first modification. The sheet extending portion 21 of the insulating sheet member 20 is interposed between the short side inner peripheral edge portion 217XA and pressed.
Moreover, in the welding process of this modification 2, it welds by irradiating YAG laser beam LB toward the outer side opening part 213Y and the outer side peripheral part 217Y which are located in the side surface of the battery case 210 completed (refer FIG. 18).

(Modification 3)
Next, a battery according to Modification 3 of the present invention will be described with reference to FIGS. The battery 1 according to the embodiment includes the short-side inner opening 13XA of the battery case body 12 that is the above-described inward inner opening, and the short-side inner peripheral portion of the sealing lid 16 that is the above-described outward inner peripheral edge. It is press-contacted with 17XA via the sheet extension part 21 of the insulating sheet member 20. That is, the sheet extending portion 21 is interposed between the short-side inner opening 13XA and the short-side inner peripheral edge 17XA that face each other in the radial direction of the opening HM (or the sealing lid 16) (see FIG. 5).
On the other hand, as shown in FIG. 19, the battery 301 according to the third modification includes a short-side inner opening 313 </ b> XA of the battery case body 312 facing each other in the depth direction of the opening HM (or the sealing lid 316). The sheet extending portion 21 is interposed between the short side inner peripheral edge portion 317XA of the sealing lid 316.

That is, in the battery case body 312 in the battery 301, the short side inner opening 313XA of the inner opening 313X is closer to the sealing lid 316 side than the weld 11 in the radial direction of the opening HM (from left to right in FIG. 19). It has a shape that protrudes.
On the other hand, the sealing lid 316 has a shape in which the short side inner peripheral edge portion 317XA of the inner peripheral edge portion 317X enters the inner side in the radial direction of the sealing lid 316 itself (from the left side to the right side in FIG. 19). .
Further, the short side inner opening 313XA and the short side inner peripheral edge 317XA face each other in the depth direction (vertical direction in FIG. 19) of the opening HM (or the sealing lid 316), and the short side inner opening 313XA The sheet extending portion 21 is interposed between the short side inner peripheral edge portion 317XA and pressed (see FIG. 19).
The short side inner opening 313XA of the battery case main body 312 and the short side inner peripheral edge 317XA of the sealing lid 316 are the same as the embodiment and the first and second modifications, and the short side inner opening 313XA and the short side inner peripheral edge. The sheet extending portion 21 of the insulating sheet member 20 is interposed between the portion 317XA and pressed (see FIG. 19).

Further, for the pre-weld sealing lid 316F used in the pressure welding step in the manufacturing method of the battery 301, the short side outer peripheral edge 317YA (shown by a broken line in FIG. 19) of the outer peripheral edge 317Y of the pre-weld peripheral edge 317F. The part) has a shape protruding in the radial direction of the pre-weld sealing lid 316F from the short side inner peripheral edge 317XA toward the pre-weld case main body 312F (from the right side to the left side in FIG. 19).
On the other hand, with respect to the case body 312F before welding, the short side inner opening 313XA has a short side outer opening 313YA (broken line in FIG. 19) of the outer opening 313Y of the pre-weld opening 313F in the radial direction of the opening HM. And a portion protruding from the right side to the left side in FIG.

  Further, in the pressure welding step of the manufacturing method of the battery 301, the pre-weld sealing lid 316F is disposed in the opening HM of the pre-weld case body 312F without applying external force to the pre-weld case body 312F. At this time, as shown in FIG. 19, the sheet extending portion 21 of the insulating sheet member 20 is welded while being bent along the short side inner peripheral portion 317XA of the pre-weld peripheral portion 317F of the pre-weld sealing lid 316F. The opening HM of the case main body 312F before welding is sealed with the front sealing lid 316F.

  Further, in the welding process of the manufacturing method of the battery 301, unlike the embodiment, the pre-weld sealing lid 316F and the pre-weld case are arranged in the depth direction (vertical direction in FIG. 19) of the opening HM (or the pre-weld sealing lid 316F). These are welded in a state where the main body 312F is pressed. Thereby, like embodiment and the modification 1, 2, the short side inner side opening part 313XA of the case main body 312F before welding, and the short side inner side peripheral part 317XA of the sealing lid 316F before welding are sheet extension parts between these. Thus, the battery 301 press-contacted via 21 can be manufactured.

(Modification 4)
Next, a battery according to Modification 4 of the present invention will be described with reference to FIGS. 6 to 8, 15, 16, 18, and 20. The battery 401 according to the fourth modification differs from the battery 301 according to the third modification described above in the shape of the battery case main body (case main body before welding) and the sealing lid (sealing lid before welding).

That is, in the battery case body 412 in the battery 401, the short side inner side opening 413XA of the inner side opening 413X is located on the radially inner side of the opening HM (20 in the left side to the right side). It is said that.
On the other hand, the sealing lid 116 is configured such that the short side inner peripheral edge portion 117XA of the inner peripheral edge portion 117X is located on the radially inner side (left side to right side in FIG. 20) of the sealing lid 116 itself. ing.
Note that the short side inner opening 413XA of the battery case body 412 and the short side inner peripheral edge 417XA of the sealing lid 416 extend between the sheets of the insulating sheet member 20 in the same manner as in the embodiment and the first to third modifications. The parts 21 are in pressure contact (see FIG. 20).

Further, for the sealing lid 416F before welding used in the pressure welding step in the manufacturing method of the battery 401, the short side outer peripheral edge 417YA (shown by a broken line in FIG. 20) of the outer peripheral edge 417Y of the pre-welding peripheral edge 417F. The portion) and the short side inner peripheral edge portion 417XA are arranged in the radial direction (the left-right direction in FIG. 20) of the sealing lid 416F before welding.
On the other hand, with respect to the case body 412F before welding, the short side outer opening 413YA (portion indicated by a broken line in FIG. 20) and the short side inner opening 413XA of the outer opening 413Y of the opening 413F before welding are opened. The HM is arranged in the radial direction (left-right direction in FIG. 20).

  Further, in the welding process, similarly to the third modification, the pre-weld sealing lid 416F and the pre-weld case body 412F are pressed in the depth direction (vertical direction in FIG. 20) of the opening HM (or the pre-weld sealing lid 416F). These are welded in the state. Thereby, like embodiment and the modification 1-3, the short side inner side opening part 413XA of the case main body 412F before welding and the short side inner side peripheral part 417XA of the sealing lid 416F before welding are sheet extension parts between these. Thus, the battery 401 press-contacted via the substrate 21 can be manufactured.

(Modification 5)
Next, a battery according to Modification 5 of the present invention will be described with reference to FIGS. 6 to 8, 15, 16, 18, and 21. Note that, in the battery 501 according to the fifth modification, as in the fourth modification described above, the shape of the battery case main body (case main body before welding) and the sealing lid (sealing lid before welding) is the same as the battery 301 according to the third modification described above. Different from that.

That is, the battery case main body 512 in the battery 501 is such that the short side inner side opening 513XA of the inner opening 513X is closer to the battery case main body 512 than the welded portion 211 in the depth direction of the opening HM (vertical direction in FIG. 21). It is the shape which entered (lower part in FIG. 21).
On the other hand, in the sealing lid 516, the short side inner peripheral edge portion 517XA of the inner peripheral edge portion 517X is closer to the battery case body 512 side (in FIG. 21) than the welded portion 211 in the depth direction (vertical direction in FIG. 21) of the sealing lid 516. , Upward).
The short side inner opening 513XA of the battery case main body 512 and the short side inner peripheral edge 517XA of the sealing lid 516 are extended between the sheets of the insulating sheet member 20 as in the embodiment and the first to fourth modifications. The parts 21 are in pressure contact (see FIG. 21).

Further, for the pre-weld sealing lid 516F used in the pressure welding step of the manufacturing method of the battery 501, the short side inner peripheral edge 517XA is in the depth direction of the pre-weld sealing lid 516F, and the outer peripheral edge of the pre-weld peripheral edge 517F. The short side outer periphery 517YA (the portion indicated by the broken line in FIG. 21) of 517Y has a shape protruding toward the pre-welding case body 512F (downward in FIG. 21).
On the other hand, regarding the case body 512F before welding, the short-side outer opening 513YA (portion indicated by a broken line in FIG. 21) of the outer openings 513Y of the opening 513F before welding has a short side in the depth direction of the opening HM. It is the shape which protruded from the inner side opening part 513XA to the sealing lid 516F side before welding (in FIG. 21, upper direction).

  Further, in the welding process, as in the third and fourth modifications, these are welded in a state where the pre-weld sealing lid 516F and the pre-weld case body 512F are pressed in the depth direction of the opening HM (the vertical direction in FIG. 21). To do. Thereby, like embodiment and modification 1-4, short side inner side opening part 513XA of case main body 512F before welding and short side inner side peripheral part 517XA of sealing lid 516F before welding are sheet extension parts between these. Thus, a battery 501 in pressure contact with 21 can be manufactured.

(Modification 6)
Next, a battery according to Modification 6 of the present invention will be described with reference to FIGS. 6 to 8, 15, 16, 18, and 22. Note that, in the battery 601 according to the sixth modification, the shapes of the battery case main body (case main body before welding) and the sealing lid (sealing lid before welding) are the same as those of the third modification described above. Different from that of the battery 301.

That is, the battery case body 612 in the battery 601 has a short side inner opening 613XA of the inner opening 613X in the depth direction of the opening HM (vertical direction in FIG. 22), closer to the sealing lid 616 than the welded portion 211 ( In FIG. 22, the shape protrudes upward).
On the other hand, in the sealing lid 616, the short side inner peripheral edge portion 617XA of the inner peripheral edge portion 617X is closer to the sealing lid 616 side (in FIG. 22) than the welded portion 211 in the depth direction (vertical direction in FIG. 22) of the sealing lid 616. It has a shape that goes in (below).
The short side inner opening 613XA of the battery case main body 612 and the short side inner peripheral edge 617XA of the sealing lid 616 are extended between the sheet of the insulating sheet member 20 in the same manner as in the embodiment and the first to fifth modifications. The portion 21 is in pressure contact (see FIG. 22).

Further, regarding the pre-weld sealing lid 616F used in the pressure welding step in the manufacturing method of the battery 601, the short-side outer peripheral edge 617YA (shown by a broken line in FIG. 22) of the outer peripheral edge 617Y of the pre-welding peripheral edge 617F. The part) is formed in the depth direction of the pre-weld sealing lid 616F so as to protrude from the short-side inner peripheral edge 617XA toward the pre-weld case body 612F (downward in FIG. 22).
On the other hand, with respect to the case body 612F before welding, the short side inner opening 613XA has a short side outer opening 613YA (the broken line in FIG. 22) of the outer openings 613Y of the opening 613F before welding in the depth direction of the opening HM. It is set as the shape which protruded to the sealing lid 616F before welding side (upward in FIG. 22) rather than the site | part shown by.

  Further, in the welding process, similarly to the third to fifth modifications, these are welded in a state where the pre-weld sealing lid 616F and the pre-weld case body 612F are pressed in the depth direction of the opening HM (vertical direction in FIG. 22). To do. Thereby, like embodiment and the modification 1-5, short side inner side opening part 613XA of case main body 612F before welding and short side inner side peripheral part 617XA of sealing lid 616F before welding are sheet extension parts between these. Thus, a battery 601 in pressure contact with 21 can be manufactured.

In the above, the present invention has been described with reference to the embodiment and the first to sixth modifications. However, the present invention is not limited to the above-described embodiment and the like, and can be appropriately modified and applied without departing from the scope of the invention. Needless to say, you can.
For example, in the embodiments and the first to sixth modifications, the wound electrode body 40 is shown. For example, a stacked type in which a plurality of positive plates and a plurality of negative plates are alternately stacked via separators. It is good also as an electrode body. Moreover, although the flat long cylindrical shape wound electrode body 40 is shown, for example, a cylindrical shape may be used.
In addition, although the material of the insulating sheet member 20 is polypropylene (PP), other than this polypropylene, for example, polyethylene (PE), tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer (PFA) may be used.

Moreover, in the press-contacting process of the embodiment, the electrode body 40 was joined (welded) to the positive electrode current collector 91 and the negative electrode current collector 92 that had been previously penetrated and fixed to the sealing lid 16F before welding. However, for example, after the positive electrode current collector 91 and the negative electrode current collector 92 are joined (welded) to the electrode body 40, the positive electrode current collector 91 and the negative electrode current collector 92 are penetrated and fixed to the sealing lid 16F before welding. May be.
Moreover, after covering the periphery of the electrode body 40 integrated with the sealing lid 16F before welding with the insulating sheet member 20, the electrode body 40 was inserted into the case main body 12F before welding together with the insulating sheet member 20. However, for example, the insulating sheet member 20 may be disposed in advance in the pre-weld case body 12F, and the electrode body 40 may be inserted into the pre-weld case body 12F and the insulating sheet member 20.

1,101,201,301,401,501,601 Lithium ion secondary battery (battery)
10, 110, 210, 310, 410, 510, 610 Battery case 11, 211 Welding part 12, 112, 212, 312, 412, 512, 612 Battery case body 12F, 112F, 212F, 312F, 412F, 512F, 612F Welding Front case body 13, 113, 213, 313, 413, 513, 613 Opening 13F, 113F, 213F, 313F, 413F, 513F, 613F Opening before welding 13X, 113X, 213X, 313X, 413X, 513X, 613X Inner opening Part (inward facing inward opening)
13XA, 113XA, 213XA, 313XA, 413XA, 513XA, 613XA Short side inner opening 13XB Long side inner opening 13Y, 113Y, 213Y, 313Y, 413Y, 513Y, 613Y Outer opening 16, 116, 216, 316, 416, 516, 616 Sealing lid 16F, 116F, 216F, 316F, 416F, 516F, 616F Sealing lid before welding 17, 117, 217, 317, 417, 517, 617 Peripheral part 17F, 117F, 217F, 317F, 417F, 517F, 617F Pre-weld peripheral edge 17X, 117X, 217X, 317X, 417X, 517X, 617X Inner peripheral edge (outward inner peripheral edge)
17XA, 117XA, 217XA, 317XA, 417XA, 517XA, 617XA Short side inner peripheral edge 17XB Long side inner peripheral edge 17Y, 117Y, 217Y, 317Y, 417Y, 517Y, 617Y Outer peripheral edge 20 Insulating sheet member 21 Sheet extending part 40 Electrode body S Opposite gap SF Pre-welding counter gap SX Inner gap portion SY Outer gap portion (outside of the inner gap portion of the opposed gap before welding)
HM opening

Claims (5)

An electrode body;
A rectangular box-shaped battery case containing the electrode body therein,
A rectangular bottomed battery case body made of metal and capable of accommodating the electrode body, and
A battery case comprising a rectangular plate-shaped sealing lid made of metal and sealing the rectangular opening of the battery case body;
An insulating resin sheet comprising an insulating resin sheet and interposed between the electrode body and the battery case body to insulate the two;
The battery case is
Between the opening part which makes the said opening of the said battery case main body, and the peripheral part of the said sealing lid, the opposing clearance gap which both opposes is formed, and
A battery having a welded portion formed by air-tightly welding the opening and the peripheral edge from the outside over a circumference of the peripheral edge,
The opening of the battery case body is
Among the facing gap, including an inner opening facing the inner gap located inside the battery case than the welded portion,
The peripheral edge of the sealing lid is
An inner peripheral edge facing the inner gap of the opposite gap and facing the inner opening;
The inner opening and the inner peripheral edge are in pressure contact with each other through at least a part of the insulating cover member in the circumferential direction of the sealing lid via a sheet extending portion that extends toward the sealing lid. Battery. The battery according to claim 1,
The inner opening is
An inwardly facing inner opening that is rectangular and faces radially inward of the opening;
Including a pair of short side inner side openings forming the short side of the rectangle,
The inner peripheral edge is
It is an outward inner periphery that faces the radially outer side of the sealing lid in a rectangular shape,
Including a pair of short side inner peripheral edges forming the short side of the rectangle,
The inward inner opening and the outward inner peripheral edge are:
A battery formed by pressing between the short side inner opening and the short side inner peripheral edge via the sheet extending portion of the insulating sheet member. The battery according to claim 2,
The inward inner opening is
Including a pair of long side inner side openings forming the long side of the opening,
The outward inner peripheral edge is
Including a pair of long side inner peripheral edges forming the long side of the sealing lid,
The sealing lid is
A battery formed by fitting the inner edge of the long side into the opening of the battery case main body in a form that fits into the opening of the inner side of the long side. An electrode body;
A rectangular box-shaped battery case containing the electrode body therein,
A rectangular bottomed battery case body made of metal and capable of accommodating the electrode body, and
A battery case comprising a rectangular plate-shaped sealing lid made of metal and sealing the rectangular opening of the battery case body;
An insulating resin sheet comprising an insulating resin sheet and interposed between the electrode body and the battery case body to insulate the two;
The battery case is
Between the opening part which makes the said opening of the said battery case main body, and the peripheral part of the said sealing lid, the opposing clearance gap which both opposes is formed, and
Having a welded portion formed by airtightly welding the opening and the peripheral edge from the outside over the circumference of the peripheral edge;
The opening of the battery case body is
Among the facing gap, including an inner opening facing the inner gap located inside the battery case than the welded portion,
The peripheral edge of the sealing lid is
An inner peripheral edge facing the inner gap of the opposite gap and facing the inner opening;
The inner opening and the inner peripheral edge are in pressure contact with each other through at least a part of the insulating cover member in the circumferential direction of the sealing lid via a sheet extending portion that extends toward the sealing lid. A battery manufacturing method comprising:
A pre-weld sealing lid is disposed in the opening of the pre-weld case main body, and the two are opposed to each other between the pre-welding opening forming the opening of the pre-welding case main body and the pre-welding peripheral edge of the pre-welding sealing lid A press-contacting step that constitutes a facing gap before welding and presses the inner opening and the inner peripheral edge in the circumferential direction of the sealing lid before welding via the sheet extending portion;
In the state where the inner opening and the inner peripheral edge are in pressure contact with each other, the outer opening facing the portion outside the inner gap in the pre-welding facing gap of the opening before welding, Welding that welds the outer peripheral edge facing the outer opening, facing the outer portion of the pre-welding counter gap, from the outside over the entire circumference of the pre-welding peripheral edge. And a method for producing a battery. A method of manufacturing a battery according to claim 4,
The inner opening is
An inwardly facing inner opening that is rectangular and faces radially inward of the opening;
Including a pair of short side inner side openings forming the short side of the rectangle,
The inner peripheral edge is
It is an outward inner periphery that faces the radially outer side of the sealing lid in a rectangular shape,
Including a pair of short side inner peripheral edges forming the short side of the rectangle,
The inward inner opening and the outward inner peripheral edge are:
A method for producing a battery, wherein the short side inner opening and the short side inner peripheral edge are pressed against each other via the sheet extending portion of the insulating sheet member.

Images