JP6164481B2 - Sealing body for sealed electrochemical device and its gasket - Google Patents

Description

The present invention relates to a sealing body for a sealed electrochemical device such as a capacitor or a lithium battery having an electrolytic solution for caulking and fixing an electrode terminal to a sealing plate via a gasket, and a gasket thereof.

In a sealed electrochemical device such as a capacitor or a lithium battery having an electrolytic solution for caulking and fixing an electrode terminal made of a metal material to a sealing plate via a gasket, the sealing plate and the electrode terminal are electrically insulated. At the same time, the gasket is tightly bonded to the electrode terminal and the sealing plate so that the electrolyte solution does not leak due to a compressive force when the electrode terminal is caulked and fixed. In such a caulking process of the electrode terminal, a large mechanical stress is applied to the gasket. Therefore, the end face of the electrode terminal is pressed by pressing both ends of the shaft portion of the electrode terminal using a material having high mechanical strength and chemical stability. When the gasket is compressed with , the compression density of the part close to the electrode terminal of the gasket increases, and when the sealed electrochemical device is used for many years, the gasket repeatedly expands and contracts due to the increase in temperature and internal pressure due to repeated charge and discharge. In addition, there is a problem that the airtightness between the gasket and both surfaces of the sealing plate and the end surfaces of both ends of the electrode terminal is deteriorated, and the electrolytic solution is likely to leak to the outside.

Therefore, Patent Document 1 discloses that an insulating material (corresponding to a terminal portion fitting hole) is inserted in an insertion hole (corresponding to a sealing plate) made of an aluminum material that closes an outer case that houses a capacitor element. A sealing body for a sealed electrochemical device is proposed, in which a capacitor is provided with a pair of positive and negative electrode terminals fixed by caulking and fixing the electrode terminal insertion portion via a gasket). Yes. In this Patent Document 1, the electrode terminal has a collar portion that is in contact with the inner surface of the lid body via an insulating material, and a caulking portion protrudes to a predetermined size on the outer surface of the lid body. The electrode terminal is fixed to the lid by caulking and the caulking portion that has been caulked. At this time, the portion located between the flange of the electrode terminal of the insulating material and the inner surface of the lid is press-fitted in correspondence with the recess provided in the flange and the recess provided in the lid. Insulating materials press-fitted into the respective recesses of the lid and the lid engage with each other to prevent the electrode terminal from rotating. Thus, even if a rotational force is applied to the electrode terminal carelessly, the electrode terminal does not rotate, and the extension lead connected to the electrode terminal can be prevented from being twisted or cut . Moreover , the capacitor which can prevent the deformation | transformation and damage at the time of the crimping process of an electrode terminal, and can obtain high sealing performance is provided. Further, it is also disclosed that the insulating member interposed between the electrode terminal and the lid is made of a fluororesin so that the reaction between the two when contacting the electrolyte solution filled in the outer case can be prevented.

On the other hand, Patent Document 2 discloses a lid (corresponding to a sealing plate) made of aluminum (including an alloy thereof) having a through hole, and a cylindrical boss portion and a flange portion so as to be inserted into the through hole of the lid. And a negative electrode output terminal (corresponding to an electrode terminal) having a head portion and a shaft portion extending from the head portion, and a gasket made of polypropylene (PP), thermoplastic fluororesin, etc. The shaft portion of this output terminal was inserted into the boss portion of the gasket and fixed by caulking to the through hole of the lid, the shaft through hole of the insulator disposed on the inner surface of the lid, and the shaft through hole of the plate portion of the negative electrode lead. Sealing bodies for sealed electrochemical devices using lithium ion secondary batteries as an example have been proposed. In Patent Document 2, the head of the output terminal and the flange portion of the gasket are formed in a shape other than a circle (for example, a quadrangle), and the non-rotating shape allows the output terminal and the lead member to be connected during the post-caulking process or after the product is completed. When a rotating force is applied to the coupling portion, for example, when the negative electrode lead and the negative electrode tab are joined, the electrode group is inserted into the battery can after joining, or the expansion / contraction force of the electrode group due to charge / discharge is the electrode. It is disclosed that, when transmitted to a tab, it is possible to prevent the connection portion from being broken by rotation and causing poor conduction. Furthermore, examples of the material of the gasket include polypropylene (PP) and thermoplastic fluororesin. Examples of the thermoplastic fluororesin include tetrafluoroethylene-perfluoroalkoxyethylene copolymer (PFA) and tetrafluoroethylene-hexafluoropropylene copolymer (FEP).

However, in Patent Documents 1 and 2, an electrode becomes a problem when the shaft portion of the electrode terminal is inserted into the terminal insertion hole of the gasket formed on the sealing plate and both ends thereof are pressed and fixed by caulking through the gasket. Although the prevention of terminal rotation is taken into consideration, the gasket interposed in the terminal part fitting hole of the sealing plate is made of only one layer of synthetic resin material, such as thermoplastic fluororesin, so that both ends of the shaft part of the electrode terminal are pressed. When the gasket is compressed at the end face, the compression density of the part close to the electrode terminal of the gasket increases, and when the sealed electrochemical device is used for many years, the gasket repeatedly expands and contracts due to the increase in temperature and internal pressure due to repeated charge and discharge, As a result, it is possible to solve the problem that the airtightness between the gasket and both surfaces of the sealing plate and the end surfaces of both ends of the electrode terminal deteriorates, and the electrolyte easily leaks to the outside. Not a minute.

Japanese Patent Laid-Open No. 10-32151 JP 2009-87728 A

In order to solve the above-mentioned problems, the present invention prevents deterioration of the airtightness between the gasket and both sides of the sealing plate and the end surfaces of both ends of the electrode terminal due to the use of the sealed electrochemical device for many years. It is an object of the present invention to provide a sealing body for a sealed electrochemical device that makes it difficult to leak liquid to the outside and a gasket thereof.

The invention according to claim 1 relating to the gasket of the sealing body for a sealed electrochemical device according to the present invention is such that the electrode terminal is caulked and fixed to a sealing plate made of a metal material via a gasket made of a synthetic resin material. In the gasket of the sealing body for a type electrochemical device, the gasket is composed of an upper gasket and a lower gasket that are brought into contact with the upper surface and the lower surface of the sealing plate, respectively, and the upper gasket has a terminal insertion hole in the approximate center. A first gasket made by extrusion molding into a flat plate shape with a fluorine-based resin material and a synthetic resin material having rigidity higher than that of the fluorine-based resin material , and a thickness of the first gasket on the outer peripheral edge of the first gasket made of a second gasket having an annular wall which is integrally molded so as to protrude above 1 times, the lower gasket is molded by a synthetic resin material Characterized in that made in the third gasket having a terminal insertion hole担部and its substantially central. The invention according to claim 2 is the gasket of the sealing body for a sealed electrochemical device according to claim 1, wherein a washer made of a metal material is synthesized on the lower surface of the third gasket. The lower gasket is formed integrally with a resin material. The invention according to claim 3 is made of a metal material in the sealing body for a sealed electrochemical device in which the gasket of the sealing body for a sealed electrochemical device according to claim 1 or 2 is mounted on the sealing plate. wherein said electrode terminal is caulked to the gasket on the end face of both ends of the electrode terminals by pressing the both ends by inserting the electrode terminal to the terminal insertion hole of the first gasket and the third gasket first A sealing body for a sealed electrochemical device, wherein the sealing body is tightly bonded to the sealing plate via the gasket and the third gasket.

In the gasket of the sealing member for a sealed electrochemical device, in which the electrode terminal is caulked and fixed to the sealing plate made of the metal material of the present invention via the gasket made of the synthetic resin material, the gasket is an upper surface and a lower surface of the sealing plate. Each of the upper gasket and the lower gasket, wherein the upper gasket is made of a fluorine resin material having a terminal insertion hole in the approximate center and is extruded into a flat plate shape and the fluorine gasket. A second gasket having an annular wall integrally formed so as to protrude from the outer peripheral edge of the first gasket and more than 1 times the plate thickness of the first gasket by a synthetic resin material having higher rigidity than the resin material ; Since the lower gasket is made of a synthetic resin material and is made of a third gasket having a flat portion and a terminal insertion hole at its approximate center, The expansion in the first outer circumferential direction of the gasket receiving by sticking to the mouth plate electrode terminal is caulked to be absorbed by the second gasket, so to hold the contact bonding between the electrode terminals in the terminal insertion hole, sealed It is possible to provide a sealing body for a sealed electrochemical device and its gasket which prevent deterioration in airtightness between the gasket and both surfaces of the sealing plate and both end surfaces of the electrode terminal due to the use of the electrochemical device for many years.

It is sectional drawing which shows the sealing body with an electrode terminal in Embodiment 1 of this invention. It is a top view of FIG. It is sectional drawing which shows the sealing type electrochemical device incorporating the sealing body with an electrode terminal of Embodiment 1 of this invention. It is sectional drawing which shows an extrusion mold with the 1st gasket of this invention. It is explanatory drawing of the 2nd gasket which cannot be formed by extrusion molding with the 1st gasket of this invention. It is an expanded view which shows the sealing body with an electrode terminal in Embodiment 1 of this invention. It is sectional drawing which shows a sealing body in Embodiment 1 of this invention. FIG. 8 is a plan view of FIG. 7. It is sectional drawing which shows the sealing board of this invention. FIG. 10 is a plan view of FIG. 9. It is sectional drawing which shows an upper gasket in Embodiment 1 of this invention. It is a top view of FIG. It is sectional drawing which shows a 1st gasket in Embodiment 1 of this invention. FIG. 13 is a plan view of FIG. 12. It is sectional drawing which shows a lower gasket in Embodiment 1 of this invention. FIG. 16 is a plan view of FIG. 15. It is sectional drawing which shows an upper gasket in Embodiment 2 of this invention. It is sectional drawing which shows a sealing body in Embodiment 2 of this invention. It is an expanded view which shows the sealing body with an electrode terminal in Embodiment 2 of this invention. It is sectional drawing which shows the sealing body with an electrode terminal in Embodiment 2 of this invention. It is sectional drawing which shows an upper gasket in Embodiment 3 of this invention.

Hereinafter, an embodiment bear of the present invention will be described with reference to the drawings.

(Embodiment 1)
1 to 16 show Embodiment 1, in which a gasket made of a synthetic resin material is attached to a sealing plate made of a metal material, and this gasket is composed of an upper gasket and a lower gasket, and an electrode terminal is attached to the sealing plate. When fixing by caulking (caulking and adhering) , the sealing plate and the electrode terminal are electrically insulated, and the electrode terminal is caulked and fixed to the sealing plate, whereby the gasket is tightly bonded to the sealing plate and the electrode terminal.

7 and 8 show a state in which the gasket 2 composed of the upper gasket 2A and the third gasket 5 as the lower gasket is attached to the sealing plate 1, and the end face of the terminal insertion wall 43 of the upper gasket 2A is the first. 3 is bonded to the upper surface of the flat portion 51 of the gasket 5.

As shown in FIGS. 9 and 10, the sealing plate 1 is a rectangular plate made of a metal material, and has an elliptical terminal portion fitting hole 11 formed in the approximate center thereof. The upper portion 12 of the attachment hole 11 has a large cross section, and an electrolytic solution injection port 13 is formed at a position away from the terminal portion insertion hole 11. Although the rectangular shape is illustrated as a shape of this sealing board 1, circular shape may be sufficient as it. Examples of the metal material include aluminum (including its alloy) and stainless steel. Further, the shape of the hole of the terminal portion fitting hole 11 is such that the gasket 2 attached to the sealing plate 1 inserts the shaft portion 62 of the electrode terminal 6 into the terminal insertion hole 32 and both ends thereof (the head 61 and the crimped end). In order to prevent the rotation and rotation of the electrode terminal 6 which is a problem when the part 63) is pressed and fixed by caulking through the gasket 2, an elliptical shape is illustrated, but it may be circular or rectangular.

As shown in FIGS. 11 and 12, the upper gasket 2 </ b> A includes a first gasket 3 made of a rectangular plate material made of a fluorine-based resin material and a second gasket 4 made of a synthetic resin material.

As shown in FIGS. 13 and 14, the first gasket 3 is a flat plate 31 formed by extruding a fluorine-based resin material into a rectangular shape, and an elliptical terminal insertion hole 32 is formed in the approximate center. Although the shape of the 1st gasket 3 has illustrated rectangular shape, circular shape may be sufficient. Moreover, although the shape of the terminal insertion hole 32 illustrates an ellipse of a size in which the shaft portion 62 of the electrode terminal 6 is inserted in close contact, it may be circular or rectangular. As this material, it is a fluorine-based resin material that is flexible and hardly eroded by the electrolyte solution, and preferably a PFA (copolymer of tetrafluoroethylene) and perfluoroalkoxyethylene) resin.

In the case where the terminal insertion hole 32 is formed in the extruded flat plate 31, in FIG. 4, the material 30 includes a punch 200 having a punching pin 202 protruding downward from the mold part 201 and a punching hole 102 downward from the mold part 101. The die 100 having the above is pressed with the pressure P to form the flat plate 31 and the terminal insertion hole 32. That is, as shown in FIG. 5B, the material 30 shown in FIG. 5A is manufactured with the first gasket 3 in which the flat plate 31 and the terminal insertion holes 32 are formed. In order to use the first gasket 3 formed in this way as the upper gasket 2A, as shown by a broken line in FIG. 5C, an annular wall 41 that protrudes upward on the outer peripheral edge thereof has a plate thickness T1 of 2. It is necessary to make the thickness T2 more than double, that is, the protrusion amount must be one time or more, and the annular wall 41 with such a large protrusion amount is extruded, and the raw material 30 is produced only by pressing. It is difficult to do. Similarly, it is difficult to produce a large amount of standing by the cylindrical terminal insertion wall 43 erected downward from the annular substrate 42 in the periphery of the terminal insertion hole 32 by pressing the extrusion material 30. It is. Therefore, such a problem that is difficult to manufacture can be solved by manufacturing the second gasket 4 by injection molding.

11 and 12, the second gasket 4 is formed on the lower surface of the first gasket 3 on the lower side of the second gasket 4 and the annular wall 41 formed on the outer peripheral edge of the first gasket 3. An annular substrate 42 and a cylindrical terminal insertion wall 43 erected from the annular substrate 42 are integrally formed by injection molding. The annular wall 41 protrudes at least one times the plate thickness of the first gasket 3 at the outer peripheral edge of the first gasket 3 and opens upward. The synthetic resin material of the second gasket 4 is made of a polyphenylene sulfide resin, a polyethylene resin, a polypropylene resin, a polystyrene resin, a polycarbonate resin, a poly resin, so that it can be integrally formed with the first gasket 3 by injection molding. Examples thereof include thermoplastic resins such as vinyl chloride resin, polyethylene terephthalate resin, polybutylene terephthalate resin, polyethylene naphthalate resin, polybutylene naphthalate resin, fluorine resin, and polyetheretherketone resin. In particular, by forming the annular wall 41 of the second gasket 4 using a synthetic resin material having higher rigidity than the fluorine-based resin material of the first gasket 3 as a preferable synthetic resin material, When the gasket 2 repeatedly expands and contracts due to a rise in temperature and internal pressure due to repeated charge and discharge, the first gasket 3 is absorbed from expanding in the outer circumferential direction, and as a result, the electrode terminal 6 in the terminal insertion hole 32 is absorbed . It is possible to keep the tight junction, and to prevent the electrolyte from leaking to the outside due to the deterioration of the airtightness between the gasket 2 and both surfaces of the sealing plate 3 and the end surfaces of both ends of the electrode terminal 6 . Further, the shape of the annular wall 41 illustrate a rectangular shape, as shown in FIGS. 1 and 2, of which have a head 61 of the electrode terminal 6 on the peripheral surface close, the head of the electrode terminal 6 61 Even when a rotational force is applied to the electrode terminal 6 inadvertently when it is joined to the external terminal with a screw or a bolt in the spiral hole 64 in the head 61, the head 61 of the electrode terminal 6 I try not to rotate. On the other hand, since the annular substrate 42 is mounted on the upper portion 12 of the sealing plate 1 and the terminal insertion wall 43 is mounted in the terminal portion fitting hole 11 of the sealing plate 1, the combined length of the annular substrate 42 and the terminal insertion wall 43 is long. That is, the protruding amount of the lower surface of the upper gasket 2 </ b> A may be set so that the end surface of the terminal insertion wall 43 can be tightly bonded to the upper surface of the flat portion 51 of the third gasket 5. Further, the outer shape of the annular substrate 42 and the terminal insertion wall 43 may be set so that the terminal portion fitting hole 11 of the sealing plate 1 and the shaft portion 62 of the electrode terminal 6 can be tightly joined.

Further, as shown in FIGS. 15 and 16, the third gasket 5 serving as a lower gasket includes a flat portion 51, a terminal insertion hole 53, and an annular wall 52, and is formed into a rectangular shape with a synthetic resin material. ing. The annular wall 52 projects downward on the outer peripheral edge of the flat portion 51, and a terminal insertion hole 53 is formed at the approximate center of the flat portion 51. The shape of the flat portion 51 is exemplified as a rectangular shape, but may be a circular shape. Further, the shape of the terminal insertion hole 53 is the same as that of the first gasket 3 and may be matched. In addition, as a synthetic resin material of the 3rd gasket 5 used as a lower gasket, polyphenylene sulfide resin, polyethylene resin, polypropylene resin, polystyrene resin, polycarbonate resin, polyvinyl chloride resin, polyethylene terephthalate resin Examples include thermoplastic resins such as polybutylene terephthalate resin, polyethylene naphthalate resin, polybutylene naphthalate resin, fluorine resin, and polyether ether ketone resin. 1 and the electrode terminal 6 must be electrically insulated, and the shaft portion 62 of the electrode terminal 6 must be inserted in close contact with the terminal insertion hole 53 and caulked and fixed with the flat portion 51. is there. Therefore, the projecting height of the annular wall 52 may be set so that the caulking end 63 of the electrode terminal 6 can be electrically insulated from the sealing plate 1.

In order to make a sealing body with electrode terminals using the gasket 2 made in this way, as shown in FIG. 6, first, the upper gasket 2A composed of the first gasket 3 and the second gasket 4 is sealed. The annular substrate 42 of the second gasket 4 and the cylindrical terminal insertion wall 43 are fitted to or attached to the terminal portion fitting holes 11 of the sealing plate 1 in contact with the upper surface of the plate 1 to form a lower gasket. By bringing the third gasket 5 into contact with the lower surface of the sealing plate 1, the sealing body shown in FIG. 7 is obtained. At this time, the adhesiveness is likely to deteriorate due to the difference between the linear expansion coefficient of the metal material of the sealing plate 1 and the linear expansion coefficient of the synthetic resin material of the second gasket 4, but the annular substrate 42 of the second gasket 4 is sealed. Since it joins so that it may be fitted or attached to the upper part 12 of the terminal part fitting hole 11 of the board 1, it can follow expansion-contraction and can maintain close_contact | adherence joining. Next, the shaft portion 62 of the electrode terminal 6 is inserted into the terminal insertion hole 32 of the upper gasket 2 </ b> A and the terminal insertion hole 53 of the third gasket 5, and the washer 7 made of a metal material is flattened on the third gasket 5. The shaft portion 62 of the electrode terminal 6 is inserted into the terminal insertion hole 71 of the washer 7 in contact with the lower surface of the portion 51, and the head 61 and the other end (the upper end) of the shaft portion 62 of the electrode terminal 6 ( By pressing the crimping end portion 63 of the lower end), the end surface of the cylindrical terminal insertion wall 43 of the second gasket 4 and the upper surface of the flat portion 51 of the third gasket 5 are tightly joined, and FIG. As shown in FIG. 2, a sealing body with an electrode terminal is formed in which the sealing plate 1 and the electrode terminal 6 are electrically insulated and tightly joined via the gasket 2. By such caulking and fixing processing of the electrode terminal 6, the shaft portion 62 of the electrode terminal 6 expands in the direction of these holes when inserted into the terminal insertion hole 32 of the upper gasket 2A and the terminal insertion hole 53 of the third gasket 5. Or the upper surface of the first gasket 3, the upper surface of the first gasket 3 and the sealing plate 1, the terminal insertion wall 43 and the sealing plate of the second gasket 4. first terminal portion fitting hole 11, a terminal insertion wall 43 of the second gasket 4 strongly close contact than the third upper and lower surfaces transgression of the sealing plate 1 of the terminal insertion hole 53 and the third gasket 5 of the gasket 5 Will be.

In the sealing body with electrode terminal thus formed, the shaft portion 62 of the electrode terminal 6 and the terminal insertion hole 32 of the gasket 2 are formed in an oval shape, or the cylindrical terminal insertion of the gasket 2 is performed. The wall 43 and the terminal part fitting hole 11 of the sealing plate 1 are formed in an oval shape, or the head 61 of the electrode terminal 6 and the annular wall 41 of the upper gasket 2A are close to each other in a rectangular shape. Therefore, the electrode terminal 6 is prevented from rotating by using them alone or in combination.

FIG. 3 shows a lithium battery as a sealed electrochemical device in which the sealing body with electrode terminals is used. In FIG. 3, a main body 10 that is a rectangular or cylindrical outer shell with one end opened is tightly joined to the sealing plate 1 by a joining member A such as laser welding and sealed. Inside the sealed main body 10 is housed a housing member 9 composed of a lead plate 91, a lead plate 92, an electrolytic solution 93 and an electrode body 94. The electrode body 94 is electrically connected to the caulking end 63 of the electrode terminal 6 and the sealing plate 1 and the lead plates 91 and 92, respectively. In this embodiment, the electrode terminal 6 is either the positive electrode or the negative electrode, but may be a pair of electrode terminals. Thus, there is a problem when the both ends of the electrode terminal 6, that is, the head 61 and the caulking end portion 63, which are inserted and closely attached to the terminal portion fitting hole 11 of the sealing plate 1 through the gasket 2, are caulked and fixed. The electrode terminal 6 is prevented from rotating, and the deterioration of the airtightness between the both surfaces of the gasket 2 and the sealing plate 1 and the both end surfaces of the electrode terminal 6 due to the use of the sealed electrochemical device for many years is prevented. It is possible to provide a sealed electrochemical device sealing body that makes it difficult for the liquid 93 to leak out.

(Embodiment 2)
17 to 20 show the second embodiment, and a gasket made of a synthetic resin material is attached to a sealing plate made of a metal material as in the first embodiment, and an electrode terminal is caulked to the sealing plate via this gasket. Hereinafter, an upper gasket and a lower gasket, which are different from those of the first embodiment, will be described.

As for the upper gasket 2A, in FIG. 17, the first gasket 3 is a flat plate 31 formed by extruding a fluororesin material in the same manner as in the first embodiment, and an elliptical terminal insertion hole 32 is formed at the approximate center. An annular protruding plate 33 made of the same fluorine-based resin material is formed on the lower surface. The protruding plate 33 is formed at a portion corresponding to the annular substrate 42 of the second gasket 4 so as to be mounted on the upper portion 12 of the terminal portion fitting hole 11 of the sealing plate 1. Since the protruding plate 33 is flexible, the protruding plate 33 bites into the terminal portion fitting hole 11 of the sealing plate 1 when the electrode terminal 6 is caulked and fixed. It is possible to facilitate close bonding to the upper portion 12. Further, the second gasket 4 is made of a synthetic resin material as in the first embodiment, and protrudes upward at an outer peripheral edge of the first gasket 3 and at least 1 times the plate thickness of the first gasket 3. The annular wall 41 is integrally formed, and the upper side is open. Further, an annular rib 44 is formed on the inner wall of the annular wall 41. The annular wall 41 and the annular rib 44 constitute the second gasket 4, and the first gasket 3 is used as a synthetic resin material. By forming the annular wall 41 of the second gasket 4 using a synthetic resin material having rigidity higher than that of the fluorine-based resin material, the gasket 2 can be increased due to an increase in temperature and internal pressure due to repeated charge / discharge of the sealed electrochemical device. There when repeating the expansion and contraction, to absorb the first gasket 3 is expanded in the outer circumferential direction, as a result, to hold the contact bonding between the electrode terminals 6 of the terminal insertion holes 32, the second gasket 4 and the cap It is possible to prevent the electrolytic solution from leaking to the outside due to deterioration of the airtightness between both surfaces (upper and lower surfaces) of the plate 1 and the end surfaces of both ends (the head 61 and the caulking end portion 63) of the electrode terminal 6. . As the synthetic resin material having higher rigidity than the fluorine resin material, if the first gasket 3 is a PFA (copolymer of tetrafluoroethylene) and perfluoroalkoxyethylene) resin, the second gasket 4 is PPS resin (polyphenylene sulfide resin) can be exemplified, and it is preferable that the injection mold is heated to a temperature close to its melting point as in the first embodiment, and is molded integrally with the first gasket 3.

The lower gasket is composed of a third gasket 5 in FIG. 19, and the third gasket 5 is formed of a synthetic resin material in a rectangular shape and protrudes downward to the outer peripheral edge of the flat portion 51. The terminal insertion hole 53 is formed in the approximate center of the annular wall 52, and these shapes and synthetic resin materials are the same as those of the first embodiment. A cylindrical terminal insertion wall 54 protruding at the periphery is formed, and this terminal insertion wall 54 has a shape corresponding to the terminal insertion wall 43 of the second gasket 4, and the protruding amount is equal to that of the upper gasket 2 </ b> A and the lower gasket. What is necessary is just to set so that the end surface of the terminal insertion wall 54 can be closely bonded to the surface of the protruding plate 33 of the first gasket 3 when the third gasket 5 is attached to the sealing plate 1. Moreover, what is necessary is just to set the external shape of the terminal insertion wall 54 so that the terminal part insertion hole 11 of the sealing board 1 and the axial part 62 of the electrode terminal 6 can be closely joined.

As shown in FIG. 19, first, the upper gasket 2 </ b> A composed of the first gasket 3 and the second gasket 4 is brought into contact with the upper surface of the sealing plate 1 using the gasket 2 thus formed. The protruding plate 33 of the first gasket 3 is fitted or attached to the upper portion 12 of the terminal portion fitting hole 11 of the sealing plate 1, the flat portion 51 of the third gasket 5 is brought into contact with the lower surface of the sealing plate 1, and the terminal The sealing body shown in FIG. 18 is obtained by bringing the end face of the insertion wall 54 into contact with the surface of the protruding plate 33 of the first gasket 3.

In the sealing body thus obtained , the head 61 having a diameter larger than the shaft portion 62 of the electrode terminal 6 is brought into contact with the annular rib 44 formed on the inner wall of the annular wall 41 of the second gasket 4. A metal material in which the shaft portion 62 of the electrode terminal 6 is inserted into the terminal insertion hole 32 of the upper gasket 2A and the terminal insertion hole 53 of the third gasket 5, and is further brought into contact with the lower surface of the flat portion 51 of the third gasket 5. The shaft portion 62 of the electrode terminal 6 is inserted into the terminal insertion hole 71 of the washer 7, and the head 61 at one end (upper end) of the electrode terminal 6 and the caulking end portion 63 at the other end (lower end) are pressed. , The projecting plate 33 of the first gasket 3 and the end face of the terminal insertion wall 54 of the third gasket 5 are tightly joined, and the sealing plate 1 and the electrode terminal are interposed via the gasket 2 as shown in FIG. 6 and are electrically insulated and closely bonded is Electrode terminals with the sealing body is formed. In this case, since the head 61 of the electrode terminal 6 is brought into contact with the annular rib 44 of the second gasket 4, the electrode terminal 6 is prevented from rotating.

Thus, the sealing body with an electrode terminal produced can be used for the sealed electrochemical device shown in FIG.

(Embodiment 3)
FIG. 21 shows a different embodiment of the third gasket shown in Embodiment 2, wherein the third gasket 5 has an annular wall 52 at the edge of the flat portion 51, and the lower surface of the flat portion 51, ie, terminal insertion A washer 7 made of a metal material having a terminal insertion hole 71 on the surface opposite to the surface on which the wall 54 is formed is formed integrally with the third gasket 5 with a synthetic resin material. By using the third gasket 5 with a washer as the lower gasket in this manner, the workability in the caulking and fixing process of the electrode terminal 6 is improved.

In addition, the outer periphery shown to the said Embodiment 1-3 shall include the circumference | surroundings of an edge part. For example, the annular wall 41 formed in the first gasket 3 includes a portion located in the terminal insertion hole 32 direction from the end of the flat plate 31, and the annular wall 52 formed in the third gasket 5 is the end of the flat portion 51. To the terminal insertion hole 53 direction.

As a sealing body for a sealed electrochemical device of the present invention, a gasket made by injection molding a plate material made by extrusion molding with a fluorine-based resin material is used, and the electrode terminal is caulked and fixed to the sealing plate via this gasket. Useful for sealed batteries and capacitors.

DESCRIPTION OF SYMBOLS 1 Sealing plate 2 Gasket 3 1st gasket 4 2nd gasket 5 3rd gasket 6 Electrode terminal

Claims (3)

In a gasket for a sealing body for a sealed electrochemical device, in which an electrode terminal is caulked and fixed to a sealing plate made of a metal material via a gasket made of a synthetic resin material, the gasket is provided on each of an upper surface and a lower surface of the sealing plate. made of an upper gasket and a lower gasket for abutting, the upper gasket, than the first gasket and the fluorine-based resin material made of plate-like extrusion with a fluorine-based resin material having a terminal insertion hole substantially at the center also made of a second gasket having an annular wall which is integrally molded so as to protrude the first outer peripheral edge of the gasket and the first gasket plate thickness 1 times or more in high rigidity synthetic resin material , tight the lower gasket, characterized in that made in the third gasket having a has been flat portion and the terminal insertion hole substantially at its center forming a synthetic resin material Gasket type electrochemical device for sealing body. 2. The hermetically sealed electric device according to claim 1, wherein a washer made of a metal material is formed integrally with a synthetic resin material of the third gasket on the lower surface of the third gasket to form the lower gasket. Sealing gasket for chemical devices. A sealing body for a sealed electrochemical device in which the gasket for a sealing body for a sealed electrochemical device according to claim 1 or 2 is attached to the sealing plate. Electrode terminals made of a metal material are connected to the first gasket and the first gasket. and inserted into the terminal insertion hole 3 of the gasket through the at the end face at both ends of the electrode terminal is caulked to the gasket the electrode terminals of the first gasket and the third gasket by pressing the opposite ends A sealing body for a sealed electrochemical device, wherein the sealing body is tightly bonded to a sealing plate.

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