JP5583546B2 - Sealed battery - Google Patents

Description

  The present invention relates to a sealed battery in which a vent portion for releasing pressure in a battery case in which an electrode body is housed is provided in a lid portion of the battery case.

  2. Description of the Related Art Conventionally, a sealed battery is known in which a vent portion for releasing pressure in a battery case in which an electrode body is housed is provided on a lid portion of the battery case. In such a sealed battery, for example, as disclosed in Patent Document 1, a thin-walled vent portion (cleavage vent) is formed by pressing on a lid portion (sealing plate) made of metal such as iron or stainless steel. Yes.

JP-A-2005-235531

  By the way, when the thin vent part is formed in the metal lid part by press work as in the above-mentioned Patent Document 1, it is necessary to perform press work with high accuracy so that the vent part operates normally. Therefore, in order to form the vent part by press working, difficult press work is required.

  In addition, when press working is performed, work hardening occurs at that part. Therefore, in order for the vent part to function properly, the bent part after press working is annealed and is generated by work hardening at the vent part. It is necessary to remove internal strain.

  An object of the present invention is to form a vent part easily on a lid part without impairing the function as a vent part in a sealed battery in which a vent part is provided on a lid part covering an opening of an outer can that houses an electrode body. It is to obtain a configuration that can be used.

  A sealed battery according to an embodiment of the present invention includes a metal bottomed cylindrical outer can in which an electrode body is housed, and a metal lid that closes an opening of the outer can. In the through hole formed in the portion, a resin vent portion is provided that is torn when the pressure in the space formed by the outer can and the lid portion exceeds a predetermined value (first configuration).

  With this configuration, the vent portion can be formed separately from the metal lid portion. Therefore, compared with the case where the vent portion is formed by press working, the vent portion can be easily formed, and work hardening can be prevented from occurring due to the press working of the vent portion. Therefore, since a process such as annealing is not necessary, the manufacturing process of the sealed battery can be simplified.

  In the first configuration, one electrode of the electrode body is electrically connected to the outer can and the lid, and the lid is electrically insulated from the lid. A terminal electrically connected to the other electrode of the electrode body passes therethrough, and an insulating coating for electrically insulating the lid portion from the terminal is provided on the outer surface of the lid portion. It is preferable that a portion is provided, and the vent portion is constituted by a part of the insulating coating portion (second configuration).

  Thereby, it can prevent that electrolytic corrosion arises between a cover part and a terminal by moisture, such as condensation. That is, since the outer surface of the lid portion is covered with the insulating coating portion, the lid portion and the terminal can be electrically insulated, and moisture is interposed between the lid portion and the terminal. However, electrolytic corrosion can be prevented from occurring in the lid and the terminal.

  And since a vent part is comprised by a part of above-mentioned insulation coating part, it can form easily compared with the case where this insulation coating part and a vent part are formed separately.

  In addition, with the above-described configuration, since the insulating covering portion can be formed so as to cover the entire lid portion including the vent portion, it is possible to more reliably electrically insulate between the lid portion and the terminal. it can.

  In the second configuration, the lid portion is provided with an insulating portion for electrically insulating the lid portion and the terminal at a portion where the terminal penetrates, and the insulating portion is provided with the insulating portion. It is preferable to be integrally formed with the covering portion (third configuration).

  Accordingly, the insulating portion that electrically insulates between the lid portion and the terminal penetrating the lid portion is also integrally formed with the insulating coating portion, so that the insulating portion and the insulating coating portion can be easily formed. it can.

  In the third configuration, it is preferable that the insulating portion and the insulating covering portion are made of a resin formed on the surface of the lid portion and the terminal on which irregularities are formed by a surface treatment (fourth surface). Constitution).

  By doing so, the insulating portion and the insulating covering portion can be formed integrally with the lid portion and the terminal. Thereby, an insulating part and an insulation coating part can be firmly joined with respect to a cover part and a terminal. Therefore, it can prevent that an insulation coating part turns over from a cover part, or an insulation part peels from a cover part and a terminal.

  In any one of the first to fourth configurations, the vent portion is made of a resin formed on the inner peripheral surface of the through hole of the lid portion having surface irregularities provided by surface treatment. Is preferable (fifth configuration).

  Thereby, a vent part can be firmly joined with respect to the internal peripheral surface of the through-hole of a cover part. Therefore, it can prevent that a vent part peels from the internal peripheral surface of the through-hole of a cover part, and can make this vent part function normally.

  According to the sealed battery according to the embodiment of the present invention, since the resin vent portion is formed on the metal lid plate that closes the opening of the outer can that houses the electrode body, the vent portion is formed by pressing. The vent portion can be easily formed as compared with the case.

FIG. 1 is a cross-sectional view showing a schematic configuration of a sealed battery according to an embodiment of the present invention. FIG. 2 is a plan view of the sealing body as viewed from above. FIG. 3 is an enlarged cross-sectional view showing the vent portion in an enlarged manner. FIG. 4 is a cross-sectional view showing a cross section of the lid plate formed in the manufacturing process of the sealed battery. FIG. 5 is a cross-sectional view showing a state in which an insulator is formed on the cover plate and the terminal. FIG. 6 is a cross-sectional view of the sealing body. FIG. 7 is a view corresponding to FIG. 3 showing a configuration of a vent portion of a sealed battery according to another embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The same or corresponding parts in the drawings are denoted by the same reference numerals and description thereof will not be repeated.

(overall structure)
FIG. 1 is a diagram showing a schematic configuration of a sealed battery 1 according to an embodiment of the present invention. The sealed battery 1 has a sealing body 20 attached to the opening side of a bottomed cylindrical outer can 10 in which an electrode body 30 is housed. That is, the sealed battery 1 includes an outer can 10, a sealing body 20, and an electrode body 30 housed in a space formed by the outer can 10 and the sealing body 20. In addition to the electrode body 30, a non-aqueous electrolyte (not shown) is also enclosed in the space formed between the outer can 10 and the sealing body 20.

  The outer can 10 is made of a metal material such as iron or stainless steel, and is formed in a bottomed cylindrical shape by press molding. That is, the outer can 10 is formed by integrally forming a circular bottom portion 11 and a cylindrical peripheral wall portion 12. An outermost peripheral portion of an electrode body 30 described later is in contact with the peripheral wall portion 12 of the outer can 10 over the entire circumferential direction of the inner peripheral surface of the peripheral wall portion 12. As will be described in detail later, since the negative electrode is located on the outermost peripheral portion of the electrode body 30, the outer can 10 has the potential of the negative electrode.

  The sealing body 20 includes a substantially disc-shaped lid plate 21 (lid portion) fixed to the opening end portion of the peripheral wall portion 12 of the outer can 10, and an insertion port 21 a provided in the center portion of the lid plate 21 in a plan view. A terminal 22 disposed inside, and an insulator 23 that covers the outer surface of the cover plate 21 and is provided between the terminal 22 and the cover plate 21. The insulator 23 is provided in close contact with the surfaces of the lid plate 21 and the terminals 22. Specifically, the insulator 23 is subjected to surface treatment by the surface treatment method disclosed in, for example, Japanese Patent Application Laid-Open No. 2005-342895, and then the surfaces of the lid plate 21 and the terminal 22 are processed. Formed by injection molding. The insulator 23 is made of a resin such as PPS (polyphenylene sulfide resin). The cover plate 21 and the terminal 22 are made of a metal material such as iron or stainless steel, like the outer can 10. The insulator 23 may be another type of resin having insulating properties.

  The detailed configuration of the sealing body 20 will be described later.

  An insulating plate 24 is disposed on the inner side of the sealed battery 1 of the terminal 22. The insulating plate 24 is formed in a bottomed cylindrical shape in which the outer peripheral portion of the disc-shaped bottom portion is bent, and a gas vent 24a is provided in the central portion in plan view of the bottom portion. The lid plate 21 is fixed to the opening end portion of the peripheral wall portion 12 of the outer can 10 by laser welding or the like while being supported by the opening end portion of the insulating plate 23.

  Although not particularly shown, the electrode body 30 is a spirally wound sheet in which a sheet-like positive electrode 31 and a negative electrode 36 are stacked in the thickness direction with a separator interposed therebetween. In the electrode body 30, the positive electrode 31 has a positive electrode active material, and the negative electrode 36 has a negative electrode active material.

  The positive electrode 31 includes a strip-shaped positive electrode current collector 32 and two strip-shaped positive electrode sheets 33 which are provided so as to sandwich the positive electrode current collector 32 and have the same thickness dimension. The positive electrode sheet 33 constitutes a positive electrode active material layer. This positive electrode sheet 33 is prepared by, for example, blending a positive electrode active material with a conductive additive or a binder, rolling a positive electrode mixture formed by adding water or the like as necessary, with a roll or the like, and drying and pulverizing it. It is obtained by rolling again and forming into a sheet. Examples of the positive electrode active material include manganese dioxide, carbon fluoride, lithium cobalt composite oxide, spinel type lithium composite oxide, and the like. Moreover, as a conductive support agent, the 1 type, or 2 or more types of composite selected from graphite, carbon black, acetylene black, ketjen black, etc. can be mentioned. Further, as the binder, polytetrafluoroethylene (PTFE) or a rubber-based binder can be used. As the positive electrode current collector 32, a plain woven wire mesh made of stainless steel, expanded metal, lath steel, punching metal, metal foil, or the like can be used.

  The positive electrode sheet 33 is formed such that the width dimension (longitudinal direction of the sealed battery 1 in FIG. 1) is larger than the width dimension of the positive electrode current collector 32. As shown in FIG. 1, the positive electrode 31 of the electrode body 30 and the lower surface of the terminal 22 are connected by a positive electrode lead 15. Thereby, the terminal 22 has a positive potential. That is, the terminal 22 functions as a positive terminal.

  The negative electrode 36 includes a strip-shaped negative electrode current collector 37 and two strip-shaped negative electrode sheets 38 which are provided so as to sandwich the negative electrode current collector 37 and have the same thickness dimension. The negative electrode sheet 38 is formed by forming metallic lithium into a sheet shape. As the negative electrode current collector 37, a metal foil made of copper, nickel, iron, stainless steel, or the like can be used. The negative electrode current collector 37 is formed such that the width dimension (longitudinal direction of the sealed battery 1 in FIG. 1) is larger than the width dimension of the negative electrode sheet 38.

  As shown in FIG. 1, the electrode body 30 is wound with the positive electrode 31 and the negative electrode 36 overlapped so that the negative electrode current collector 37 of the negative electrode 36 is exposed to the outer peripheral side. As a result, the peripheral wall portion 12 of the outer can 10 in contact with the outermost peripheral surface of the electrode body 30 is electrically connected to the negative electrode current collector 37 of the negative electrode 36 to become a negative electrode. That is, in the sealed battery 1 of the present embodiment, the outer can 10 functions as a terminal on the negative electrode side.

  Further, in the electrode body 30 wound in a cylindrical shape, a separator 35 is disposed between both end portions in the axial direction and between the positive electrode 31 and the negative electrode 36. Although detailed description is omitted, the separator 35 is configured by overlapping a nonwoven fabric and a microporous film.

(Sealing body)
As described above, the sealing body 20 includes the disk-shaped lid plate 21, the terminal 22 that penetrates the lid plate 21, and the insulator 23 formed on the outer surface of the lid plate 21 and around the terminal 22. Have

  As shown in FIG. 2, a vent port 21 b (through hole) is formed in the lid plate 21, in addition to the insertion port 21 a through which the terminal 22 is inserted, a vent part that is cleaved when the internal pressure of the sealed battery 1 is increased. And an inlet 21c for injecting a non-aqueous electrolyte into the space formed by the lid plate 21 and the outer can 10 is formed. As shown in FIG. 2, the vent port 21 b is formed in an arc shape extending in the circumferential direction of the disc-shaped lid plate 21. As shown in FIG. 2, the vent port 21 b and the injection port 21 c are formed on opposite sides of the insertion port 21 a of the lid plate 21.

  As shown in FIG. 1, the terminal 22 is one in which a flange portion 22 b is integrally formed on one end side of the shaft portion 22 a, and the shaft portion 22 a is inserted into the cover plate 21 with respect to the cover plate 21. It arrange | positions so that the opening | mouth 21a may be penetrated. That is, the terminal 22 has the opposite side of the shaft portion 22 a to the flange portion 22 b inserted through the insertion port 21 a of the lid plate 21, and the flange portion 22 b is positioned outside the battery of the lid plate 21. Further, as will be described later, the terminal 22 has a distal end portion 22c protruding from the flange portion 22b of the shaft portion 22a in a state where the terminal 22 is inserted through the insertion port 21a of the lid plate 21 (see FIG. 1). The other end side of the positive electrode lead 15 whose one end side is connected to the positive electrode 31 of the electrode body 30 is connected to the protruding tip portion 22c.

  The insulator 23 includes an insulating covering portion 23 a that covers the outer surface of the lid plate 21, and an insulating portion 23 b that is partially located between the lid plate 21 and the terminal 22. As will be described later, the insulator 23 is integrated with the terminal 22 and the cover plate 21 to hold the terminal 22 against the cover plate 21. The insulating coating portion 23a is also provided in the vent port 21b and the injection port 21c formed in the lid plate 21. That is, a part of the insulating coating portion 23a constitutes the vent portion 40 in the vent port 21b. Furthermore, the insulation coating portion 23a covers the inner wall of the injection port 21c. As shown in FIGS. 1 and 2, the insulating coating portion 23 a is not provided at the welded portion of the lid plate 21 with the outer can 10 (the outer peripheral end portion of the lid plate 21).

  Thus, by providing the insulating coating portion 23a on the outer surface of the lid plate 21, the lid plate 21 and the terminal 22 can be electrically insulated from each other, and the lid plate 21 and the terminal 22 are covered with moisture or the like. Can prevent electrolytic corrosion.

  Further, as will be described later, the insulating coating portion 23a is formed so as to be integrated with the cover plate 21 and the terminal 22 with respect to the cover plate 21 and the terminal 22 which are surface-treated so as to form irregularities on the surface. It is made of resin material. Thereby, the insulation coating portion 23a can be firmly bonded to the lid plate 21 and the terminal 22, and the insulation coating portion 23a can be prevented from peeling off from the lid plate 21 and the terminal 22.

  As shown in an enlarged view in FIG. 3, the vent portion 40 is configured by forming a part of the insulating coating portion 23 a formed in the vent port 21 b of the lid plate 21 to be thin. That is, the insulation coating portion 23a located in the vent port 21b is formed thin at the central portion in the width direction of the vent port 21b.

  Specifically, in the vent portion 40, an arc-shaped groove in plan view from both sides of the lid plate 21 is formed in the insulating coating portion 23a in the vent port 21b corresponding to the arc-shaped vent port 21b as shown in FIG. It is formed (see FIG. 3). Further, as shown in FIG. 3, an arc-shaped groove is formed in the center portion in the width direction on the battery inner side of the first thin portion 41 formed thereby, and the first portion is formed in the groove bottom portion. A second thin portion 42 that is thinner than the thin portion 41 is formed. Thereby, when the pressure in the sealed battery 1 becomes a predetermined value or more, the second thin part 42 of the vent part 40 is cleaved, and the gas in the sealed battery 1 is released to the outside from the cleaved part.

  In this way, the vent portion 40 is configured by a part of the insulating coating portion 23a formed on the lid plate 21, so that the vent portion is compared with the conventional configuration in which the metal lid plate is pressed to form the vent. 40 can be formed easily. That is, when forming the vent part 40, highly accurate press work is not required. In addition, since work hardening due to press working does not occur, steps such as annealing are not required. Moreover, since the vent portion 40 is formed at the same time when the insulating coating portion 23a is formed, the vent portion 40 can be easily formed.

  Further, as will be described in detail later, the vent portion 40 is integrated with the lid plate 21 on the inner peripheral surface of the vent port 21b of the lid plate 21 that has been surface-treated so that the surface is uneven. It is firmly joined. Thereby, it can prevent that the vent part 40 peels from the internal peripheral surface of the vent port 21b. Therefore, it can prevent that the function as the vent of the vent part 40 is impaired.

  As described above, the inlet 21c formed in the lid plate 21 has its inner wall covered with the insulating coating portion 23a. After the non-aqueous electrolyte is injected into the space formed by the outer can 10 and the lid plate 21 from the injection port 21c, a resin sealing plug 25 is inserted into the injection port 21c. The sealing plug 25 fitted into the injection port 21c is welded to an insulating coating portion 23a that covers the lid plate 21 at the outer peripheral portion.

  In this way, the inner wall of the inlet 21c of the lid plate 21 is covered with the insulating coating portion 23a, and the inlet 21c is closed with the resin sealing plug 25 so that the entire outer surface of the lid plate 21 is insulated without any gaps. While being able to cover with the coating | coated part 23a, the injection hole 21c can be sealed more reliably. That is, when trying to seal the injection port 21c covered with the insulating coating portion 23a made of resin with a metal sealing plug, it is difficult to firmly bond the sealing plug and the insulating coating portion 23a, By making the sealing plug made of resin, the inlet 21c can be more reliably sealed by the sealing plug 25.

  A part of the insulating portion 23 b is formed between the cover plate 21 and the terminal 22. Specifically, the insulating portion 23b is formed between the cover plate 21 and the flange portion 22b of the terminal 22, between the inner peripheral surface of the insertion port 21a of the cover plate 21 and the shaft portion 22a of the terminal 22, and the cover. It is formed between the plate 21 and the tip portion 22 c of the terminal 22. Further, the insulating portion 23b extends radially outward of the lid plate 21 on the battery inner side of the lid plate 21, and extends in the axial direction of the sealed battery 1 from the outer peripheral edge portion toward the battery inner side. ing. That is, the insulating portion 23 b is formed so as to surround the tip end portion 22 c of the terminal 22 on the battery inner side of the lid plate 21.

  The insulating part 23b is integrally formed with the insulating coating part 23a. Also, the insulating portion 23b is integrated with the cover plate 21 and the terminal 22 with respect to the cover plate 21 and the terminal 22 that are surface-treated so as to form irregularities on the surface, similarly to the above-described insulating covering portion 23a. It is comprised by the resin material formed in this way. Thereby, since the insulation part 23b is firmly joined with respect to the cover plate 21 and the terminal 22, it can prevent peeling from this cover plate 21 and the terminal 22. FIG.

(Manufacturing method of sealing body)
Next, the manufacturing method of the sealing body 20 which has the above structures is demonstrated based on FIGS.

  First, as illustrated in FIG. 4, the insertion plate 21 a, the vent port 21 b, and the injection port 21 c are respectively provided in a disk-shaped member to form the lid plate 21. Further, a terminal 22 having a shape as shown in FIG. 5 is prepared. That is, the terminal 22 has a shape in which a flange portion 22b is formed on one end side of the shaft portion 22a. Then, surface treatment such as etching is performed by a method disclosed in, for example, Japanese Patent Application Laid-Open No. 2005-342895 so that fine irregularities are formed on the surfaces of the lid plate 21 and the terminals 22.

  Next, the cover plate 21 and the terminal 22 are held by the molding dies 51 to 53 in a state where the shaft portion 22 a of the terminal 22 is inserted into the insertion opening 21 a of the cover plate 21. Specifically, as shown in FIG. 5, the lid plate 21 is held by the mold 51 and the mold 52, and the terminal 22 is held by the mold 51 and the mold 53. The mold 52 is formed with a hole in which the mold 53 can be placed. The molding die 53 is formed in a size and a shape that can be placed in the hole portion of the molding die 52, and a cylindrical hole portion 53a that can hold the tip portion 22c of the terminal 22 is formed in the center portion of the upper surface. Is formed. That is, the molding die 53 holds the tip 22c of the terminal 22 in the hole 53a. Thereby, the terminal 22 can be held by the molds 51 to 53 in a state where the terminal 22 is positioned with respect to the lid plate 21.

  Here, the molds 51 to 53 are insulators between the mold 51 and the cover plate 21, between the mold 53 and the cover plate 21, and between the mold 52 and the mold 53, respectively. The gap 54 is formed so as to form the gap 23. The mold 51 is formed with an injection port 51 a for injecting resin into the gap 54.

  And in the state which hold | maintained the cover plate 21 and the terminal 22 with the shaping | molding dies 51-53 as mentioned above, resin is inject | poured from the injection hole 51a of the shaping | molding die 51, and the insulator 23 is integrated with the lid 21 and the terminal 22 integrally. To form. Since the lid plate 21 and the terminal 22 have fine irregularities on the surface as described above, the lid plate 21 and the terminal 22 are formed by injection molding a resin on the surface of the lid plate 21 and the terminal 22. The bonding strength between the resin 22 and the resin is increased.

  In addition, the molds 51 and 52 are provided with protrusions 51b and 52a that can form the vent 40, respectively. Specifically, in the molds 51 and 52, the protrusions 51b and 52a are provided at positions facing each other, and a gap formed between the protrusions 51b and 52a is shown in FIG. First thin portion 41 and second thin portion 42 are formed. Thus, when the insulator 23 is formed by resin injection molding, the vent portion 40 is also formed at the same time. Therefore, the vent part 40 can be easily formed by the manufacturing method described above.

  Furthermore, since the insulator 23 is also formed between the lid plate 21 and the terminal 22, the terminal 22 can be fixed to the lid plate 21 by the insulator 23. In addition, the insulating coating 23a formed on the outer surface of the cover plate 21 in the state assembled to the sealed battery 1 by the above-described manufacturing method, and the insulation formed between the cover plate 21 and the terminal 22 Since the part 23b is integrally formed, the insulating covering part 23a and the insulating part 23b can be easily formed.

  And after forming the insulator 23 as mentioned above, a through-hole is formed in the part corresponding to the injection hole 21c of the insulation coating part 23a. Thereby, the sealing body 20 as shown in FIG. 6 is obtained. In the sealing body 20 having such a configuration, the terminal 22 and the cover plate 21 can be firmly joined by the insulator 23, so that it is not necessary to crush the tip portion 22c of the terminal 22.

(Effect of embodiment)
With the above configuration, the vent portion 40 formed on the lid plate 21 of the sealed battery 1 covers the outer surface of the lid plate 21 and electrically insulates between the lid plate 21 and the terminal 22. 23 part. By using the resin-made vent portion 40 as described above, the vent portion 40 can be easily formed as compared with a conventional vent that presses metal. In other words, the above-described configuration eliminates the need for highly accurate pressing, and also eliminates the need for annealing and other steps for removing internal strain caused by the pressing, thereby simplifying the manufacturing process of the sealed battery 1. be able to. Moreover, since the vent portion 40 is formed at the same time when the insulator 23 is formed, the step of forming the vent portion 40 becomes unnecessary.

  Further, the insulator 23 is made of a resin material formed so as to be integrated with the cover plate 21 and the terminal 22 with respect to the cover plate 21 and the terminal 22 which are surface-treated so as to form irregularities on the surface. Is done. Thereby, the insulator 23 can be firmly joined to the lid plate 21 and the terminal 22, and the insulator 23 can be prevented from being peeled off from the lid plate 23 and the terminal 22.

(Other embodiments)
While the embodiments of the present invention have been described above, the above-described embodiments are merely examples for carrying out the present invention. Therefore, the present invention is not limited to the above-described embodiment, and can be implemented by appropriately modifying the above-described embodiment without departing from the spirit thereof.

  In the embodiment, the vent portion 40 is configured by a part of the insulator 23. However, as shown in FIG. 7, only the resin vent 40 may be formed in the vent 21b. Moreover, you may form the insulation coating part 23a and the insulation part 23b separately.

  In the embodiment, the insulator 23 is formed by injection molding the resin after performing the surface treatment as disclosed in JP 2005-342895 A for the lid plate 21 and the terminal 22. However, any formation method may be used as long as the insulator 23 is formed on the cover plate 21 and the terminal 22.

  In the embodiment, the positive electrode 31 is connected to the terminal 22, while the negative electrode 36 is connected to the outer can 10. However, the negative electrode 36 may be connected to the terminal 22 and the positive electrode 31 may be connected to the outer can 10.

  The sealed battery according to the present invention can be used for a sealed battery in which a vent portion is formed on a cover plate.

DESCRIPTION OF SYMBOLS 1 Sealed battery, 10 Outer can, 20 Sealing body, 21 Cover plate, 21a Insertion port, 21b Vent port (through hole), 21c Inlet, 22 Terminal, 23 Insulator, 23a Insulation coating part, 23b Insulation part, 30 Electrode body, 40 vent part, 41 1st thin part, 42 2nd thin part

Claims (5)

A metal bottomed cylindrical outer can in which the electrode body is housed,
A metal lid that closes the opening of the outer can,
In the through hole formed in the lid portion, a resin vent portion is provided that is cleaved when the pressure of the space formed by the outer can and the lid portion exceeds a predetermined value ,
In the electrode body, one electrode is electrically connected to the outer can and the lid,
The lid is electrically insulated from the lid and has a terminal electrically connected to the other electrode of the electrode body,
On the outer surface of the lid part, an insulating coating part for electrically insulating the lid part from the terminal is provided,
The vent part is a sealed battery configured by a part of the insulating coating part . A metal bottomed cylindrical outer can in which the electrode body is housed,
A metal lid that closes the opening of the outer can,
In the through hole formed in the lid portion, a resin vent portion is provided that is cleaved when the pressure of the space formed by the outer can and the lid portion exceeds a predetermined value,
The vent part is a sealed battery made of a resin formed on an inner peripheral surface of a through hole of the lid part having an uneven surface by surface treatment. The sealed battery according to claim 2 ,
In the electrode body, one electrode is electrically connected to the outer can and the lid,
The lid is electrically insulated from the lid and has a terminal electrically connected to the other electrode of the electrode body,
On the outer surface of the lid part, an insulating coating part for electrically insulating the lid part from the terminal is provided,
The vent part is a sealed battery configured by a part of the insulating coating part. The sealed battery according to claim 1 or 3 ,
The lid portion is provided with an insulating portion for electrically insulating the lid portion and the terminal at a portion through which the terminal passes,
The said insulation part is a sealed battery currently integrally molded with the said insulation coating part. The sealed battery according to claim 4 ,
The said insulation part and the said insulation coating part are sealed batteries which consist of the resin formed on the surface of the said cover part by which the unevenness | corrugation was formed in the surface by the surface treatment, and the said terminal.

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