JPH1070053A - Rectangular electrochemical element and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high quality of a rectangular electrochemical element which is optimumly used for thin applications and excellent in its vibration resistance and sealing capability and also to provide a method for fabricating the element. SOLUTION: Rectangular electrode members 1 and 1 shaped by pressing are housed in current collectors 2 and 2 having lead parts 2a attached thereto to form electrode parts 3 and 3. A separator 4 is disposed between these electrode parts 3 and 3, these electrode parts are stacked to form a group of electrodes 19, an elastic member 5 is mounted on one electrode parts 3 of the electrode group 19, the electrode parts 3 and 3 and elastic member 5 are fixed with tape 6, and then the assembly is accommodated in a sheathing case 7. Subsequently an electrolytic solution is placed in the sheathing case 7, the lead parts 2a and 2a of the current collection cases 2 and 2 are electrically connected to positive and negative terminals 8 and 9 of a lid 10, and then the sheathing case 7 is sealed with the lid 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rectangular electrochemical device and a method for manufacturing the same.

[0002]

2. Description of the Related Art A conventional electrochemical element includes a cylindrical aluminum case sealed with a rubber packing as shown in FIG. 19, or a resin gasket made of polypropylene (PP) or the like as shown in FIG. There is a coin case of a stainless steel case that is sealed through. In both types, the sealing was performed by a caulking method. In particular, the cylindrical type had a structure in which the positive electrode and the negative electrode protruded from the holes formed in the rubber packing.

[0003]

However, the cylindrical type is not suitable for thin applications due to its shape. Further, as described above, the sealing structure is a caulking type via a rubber packing, so that the sealing property is not good. And easily leaked during temperature cycling.

In the coin type, the sealing gasket is P
Since it is made of a resin such as P, it is not suitable for use at high temperatures, and is smaller than a cylindrical type, but has a poor storage efficiency of the internal electrode group 32, and has a reduced capacity for its volume.

An object of the present invention is to provide a high-quality rectangular electrochemical element which is optimal for thin applications, has excellent vibration resistance and sealing properties, and can withstand high-temperature use, and a method for producing the same.

[0006]

That is, according to the first aspect of the present invention, an electrode group (19) having a separator (4) interposed between a positive electrode material and a negative electrode material, and the electrode group (1).
9) comprising a resin outer case (7) for accommodating the positive electrode terminal (8) and a resin lid (10) provided with a positive electrode terminal (8) and a negative electrode terminal (9). Are electrically connected to the corresponding positive electrode terminal (8) and negative electrode terminal (9) of the lid (10), respectively, and the exterior case (7) is sealed with the lid (10). It is characterized by comprising.

According to the present invention, the electrode group (19) comprises a current collector case (2, 2) having a rectangular electrode body (1, 1) provided with a lead portion (2a). 2) to form positive and negative electrode sections (3, 3), a separator (4) interposed between the electrode sections (3, 3), and the electrode body (1, 3). It is characterized in that it is formed so that the surfaces of 1) face each other.

According to the third aspect of the present invention, the current collecting case (2) has a frame portion (2b) on the periphery of the bottom surface (2c).
) And the lead portion (2a) is integrated with the current collecting case (2).

Further, according to the present invention, the lead portion (2a) is formed of a frame portion (2b) of the current collecting case (2).
Alternatively, it is characterized in that it is formed so as to extend a part of the bottom surface (2c).

According to the present invention, a gap (G) is formed between the opposing current collecting cases (2).

According to the present invention, an elastic body (5) is interposed between one of the electrode portions (3) of the electrode group (19) and the outer case (7). It is characterized by being.

Further, according to the present invention, the elastic body (5) has a plate-like spring formed with a plurality of ridges (5a) whose height is continuously changed along the longitudinal direction. It is characterized by being.

The present invention according to claim 8 is characterized in that the elastic body (5) is fixed together with an electrode group (19) by a tape (6).

According to a ninth aspect of the present invention, the elastic member (5) is provided on the surface of the negative electrode portion (3).

According to the present invention, the elastic body (5) is made of stainless steel.

Further, according to the present invention, the body (8a) of the positive terminal (8) and the body (9a) of the negative terminal (9) projecting into the lid (10). ) Is sealed with a thermosetting resin (11).

In the twelfth aspect of the present invention, a boss (10a) at the base peripheral edge of the body (8a, 9a) has a V.
It is characterized in that a groove (10b) is formed.

According to a thirteenth aspect of the present invention, a cylindrical body (12) is fitted around the outer periphery of the boss portion (10a).

The present invention according to claim 14 is characterized in that the boss portion (10a) is provided with a groove portion (24) at the root periphery.

According to a fifteenth aspect of the present invention, a plurality of reinforcing ribs (25) are radially provided in the groove (24).

The present invention according to claim 16 is characterized in that a thin portion (13) is provided at an appropriate position on the outer case (7) or the lid (10) to provide an explosion-proof mechanism.

The present invention according to claim 17 is characterized in that a thick portion (14) is formed at the center of the thin portion (13).

According to the present invention, the thin case (1) is provided on the surface of the outer case (7) having the largest area.
3) is provided to provide an explosion-proof mechanism.

According to the present invention, the thin portion (13) is provided at the center of the outer case (7).

According to the present invention, the thin portion (13) has a Y-shape, a J-shape or a -shape.

According to the present invention, the guide groove (7a) into which the elastic body (5) fixed to the electrode portion (3) is inserted is provided on the inner wall surface of the outer case (7). A recess (7b) formed at a predetermined location on the outer surface of the outer case (7) for determining the orientation of the outer case (7).
) Is formed.

According to the present invention, the rectangular electrode body (1, 1) is formed by press molding, and the electrode body (1, 1) is provided with a lead portion (2a). Housed in the collected current collector cases (2, 2) to form electrode portions (3, 3),
After a separator (4) is interposed between the electrode portions (3, 3), the electrode portions (3, 3) are stacked so that the surfaces of the electrode bodies (1, 1) face each other, and an electrode group is formed. Next, an elastic body (5) is placed on the surface of one of the electrode portions (3) of the electrode group (19), and the elastic members (3, 3) and The body (5) is fixed with a tape (6) and housed in an outer case (7) having a bottomed square shape made of resin,
Next, an electrolytic solution is injected into the outer case (7), and then the lead portions (2a, 2a, 2
a) corresponds to the corresponding positive electrode terminal (8) of the lid (10)
And the negative electrode terminal (9), and the outer case (7) was sealed with a resin lid (10).

In the present invention according to claim 23, after the conductive adhesive (15) is applied to the inner surface of the current collecting case (2, 2), the electrode body (1, 1) is placed thereon. installed.

According to the present invention, the conductive adhesive (15) is a conductive adhesive containing graphite powder and a rubber binder.

According to the present invention, a separator (4) having a size larger than that of the current collecting case (2, 2) is interposed between the electrode portions (3, 3), and one end thereof is provided. Are connected to the lead portions (2a, 2a) of the current collecting case (2, 2).
A tongue portion (4a) was provided so as to protrude on the opposite side of (a), and this tongue portion (4a) was folded inward and then stored in the exterior case (7).

According to the present invention, the lead portions (2a, 2a) of the current collecting cases (2, 2) are covered with a heat-shrinkable tube (16) and formed into a predetermined shape. A positive terminal (8) and a negative terminal (9) of the lid (10) corresponding to the lead portions (2a, 2a), respectively.
Was connected by ultrasonic welding.

Further, according to the present invention described in claim 27, the joining portion between the lead portions (2a, 2a) and the positive electrode terminal (8) and the negative electrode terminal (9) is formed into a shape that can be fitted, After the attachment, each was ultrasonically welded.

In the present invention, the fitting shape is a square shape or a circular shape.

According to the present invention, when manufacturing the lid (10), first, the lead rods (8c) and (9c) having different lengths are connected to the metal body (8a). And (9a
) Are welded respectively to the positive terminal (8) and the negative terminal (9)
Then, the positive electrode terminal (8) and the negative electrode terminal (9) are formed.
Are insert-molded in a resin lid (10).

According to the present invention, in insert molding, resin is injected from a gate provided at a position equidistant from the positive terminal (8) and the negative terminal (9). .

Further, in the present invention described in claim 31, the gate is provided so as to be closer to the protruding surface side of the positive electrode terminal (8) and the negative electrode terminal (9) of the lid (10).

Further, in the present invention according to claim 32, the outer case (7) is formed by injecting a resin from a gate provided on the bottom surface of the outer case (7).

In the invention according to claim 33, the outer case (7) and the lid (10) are joined by ultrasonic welding, low frequency welding or heat fusion.

Further, according to the present invention, the surface (1) of the lid (10) to be joined to the outer case (7) is provided.
The outer peripheral portion of 8) protrudes from the joint surface (18) in a convex shape.

Further, in the present invention according to claim 35, the resin of the outer case (7) and the resin of the lid (10) contains polyphenylene sulfide or polybutylene terephthalate containing 30% to 40% of glass fiber, or It is a polyphenylene ether.

According to a thirty-sixth aspect of the present invention, a liquid crystal polymer is used for the outer case (7) and the lid (10).

According to a thirty-seventh aspect of the present invention, the liquid crystal polymer contains 20 to 50% of glass fiber or talc as a filler.

Further, in the invention according to claim 38, the liquid crystal polymer is a wholly aromatic polyester.

Further, according to the present invention, the tensile strength of the liquid crystal polymer is 1500 kgf / cm ^2.
It is characterized by the above.

Further, according to the present invention as set forth in claim 40, in the rectangular electrochemical element according to any one of claims 1 to 16, the assembly jig in which the rectangular electrochemical element is fixed. A lead length detection sensor (21) for detecting a positive electrode terminal (8) or a negative electrode terminal (9) attached to the lid (10) at an appropriate position of the tool (20), and a concave portion of the outer case (7). (7b), a concave portion detection sensor (22) for detecting the direction of the outer case (7) is detected by the concave portion detection sensor (22), and the electrode portion (7) in the outer case (7) is detected. 3 and 3), and the cover (1) is detected by the lead length detection sensor (21).
0) is determined, and based on the relationship between the direction of the outer case (7) and the direction of mounting the lid (10), the polarity of the electrode portions (3, 3) and the positive electrode terminal (8) and the negative electrode terminal. The polarity consistency of (9) was checked.

[0046]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the configuration of a square electrochemical device according to the present invention will be described with reference to FIGS.

FIG. 1 is a sectional view showing the internal structure of an electric double layer capacitor to which the present invention is applied.
(b) is a side sectional view.

According to FIG. 1, reference numeral 1 denotes a square electrode formed by press-molding a powder mainly composed of activated carbon.
The activated carbon electrode body 1 is housed in each current collecting case 2 to form a positive electrode part 3 as a positive electrode material and a negative electrode part 3 as a negative electrode material. The current collecting case 2 is a metal box-shaped structure, and a lead portion 2a is formed by extending a part of the box as described later.

The electrode section 3 is laminated with a separator 4 interposed therebetween so that the electrode surfaces in the case are brought into close contact with each other, and is fixed with a tape 6 to form a single electrode group 19. Are housed in an outer case 7 having a square shape with a bottom with an elastic body 5 (plate spring 5) interposed therebetween.

The outer case 7 is made of resin, and is made of PPS (polyphenylene sulfide), PBT (polybutarene terephthalate), PP (polypropylene), PE (polyethylene), PPE (polyphenylene ether), polyamide, ABS or the like. In particular, PPS, PBT, and PPE are excellent in heat resistance, mechanical strength, and flame retardancy.

As a material other than the above, use of a liquid crystal polymer (particularly, wholly aromatic polyester) is more preferable. In this liquid crystal polymer, molecules are oriented on the resin surface to form a highly oriented thin solidified layer called a skin layer, which suppresses the movement of water molecules. (If water is mixed in the cell, the water is electrolyzed or chemically reacts with the organic electrolyte to generate gas, so that the pressure in the cell increases and the internal resistance increases.) The liquid crystal polymer exhibits strong anisotropy with respect to strength, but the anisotropy can be reduced by adding 20 to 50% of glass fiber, talc, or the like as a filler, and the strength of the resin can be increased. In particular, if the tensile strength is 1500 kgf / cm ² or more, sufficient strength of the case can be ensured.

The exterior case 7 is formed by injection molding. In the present embodiment, a gate for injecting resin is provided on the bottom surface of the exterior case 7 (arrow portion in FIG. 22A). In addition, by making the flow of the resin uniform at the time of injection, the occurrence of welds is prevented as much as possible.
In the above method, the strength of the weld portion becomes extremely small due to the anisotropy. Therefore, the above injection method is extremely effective for securing the strength of the case.

Reference numeral 10 denotes a lid for closing the outer case 7 in which the electrode group 19 is stored. The lid 10 is provided with a pair of positive electrode terminals 8 and negative electrode terminals 9 having different lengths, and these are connected to the corresponding lead portions 2a of the current collecting case 2 via flat portions or round portions. Connected by welding. The lid 10 is fitted to the open end of the outer case 7 and welded by ultrasonic welding, low frequency welding, or heat fusion. In addition to the positive and negative terminals 8 and 9, the lid 10 is provided with a thin portion 13 serving as an explosion-proof mechanism.

As shown in the external view of FIG. 2, the electric double-layer capacitor having the above-mentioned structure has a thin rectangular shape, so that its use is extremely wide.

Next, a detailed configuration of the electric double layer capacitor will be described.

As shown in FIG. 3, the current collecting case 2 for accommodating the rectangular electrode body 1 has a box-shaped structure in which a frame 2b is formed on the four-sided peripheral portion of the bottom surface 2c. ), One corner of the frame portion 2b is extended outward to form an electrode portion 3b.
Is formed. The lead portion 2a is a lead material for conducting the positive electrode terminal 8 and the negative electrode terminal 9 fixed to the lid 10 and the positive / negative electrode portion 3 as described above. Fig. 3 (b)
As shown in FIG. 7, a part of the bottom surface 2c of the current collecting case 2 may be extended.

As described above, if the current collecting case 2 is a box-shaped structure, the electrode body 1 housed in the outer case 7 is protected by the peripheral frame portion 2a as shown in FIG. Damage to the electrode body 1 (such as chipping or cracking) due to impact or the like can be prevented. If the lead portion 2a is formed by extending a part of the current collecting case 2, a new lead material for connecting the electrode portion 3 and the terminals 8 and 9 becomes unnecessary, so that the lead material is not required. And the number of parts can be reduced.

As shown in FIG. 4, by setting the height of the frame portion 2a to be slightly lower than the thickness of the electrode body 1 to be accommodated, a slight gap G is formed between the current collecting cases 2 opposed to each other. I made it. Thus, by providing the gap G over the entire circumference between the opposing positive and negative electrodes, the spring pressure of the plate-like spring 5 (not shown) interposed between the outer case 7 and the Since the load is evenly distributed and applied over the entire surface, an abnormal pressing force is applied to a part of the electrode portion 3 and the current collecting case 2
This prevents the electrode body 1 inside the current collecting case 2 from being damaged by this pressing force, and prevents the frame portions 2a of the current collecting case 2 from contacting each other to short-circuit the positive electrode and the negative electrode. Is done.

FIG. 5 is a view showing one embodiment of the plate spring 5. As shown in FIG.

Both ends 2 in the longitudinal direction of the plate spring 5
A ridge portion 5a having an elastic action is formed at a location,
Furthermore, the heights of these ridges 5a are different from each other (H1>
H2).

As another embodiment, a U-shaped notch as shown in FIG. 7 can be used, or a bellows-shaped notch as shown in FIG. 8 can be used. However, in each case, the height of the formed ridge portion 5a is continuously changed along the longitudinal direction. In each case,
The material to be used is, for example, stainless steel having excellent corrosion resistance and elasticity.

As shown in FIG. 6, the plate-like spring 5 is fixed together with the electrode group 19 with the tape 6 and housed in the outer case 7. At this time, the lower one of the ridges 5a corresponds to the outer case. 7 is inserted in the back side. This is because the gap on the opening end side from the bottom of the outer case 7 is made larger in order to facilitate removal from the mold when the outer case 7 is manufactured.

With the above configuration, the gap between the electrodes can be kept constant by fixing the laminated electrode portions 3 with the tape 6, and the electrode group 19 can be easily stored. After the storage, the outer case 7 and the electrode group 19 are securely fixed with an appropriate pressing force by the elastic action of the plate spring 5 fastened together. In particular, even when the gap between the outer case 7 and the electrode group 19 is unbalanced as described above, by changing the height of the ridge 5a of the interposed plate spring 5,
Since the generated spring load can be equalized, external vibration and impact can be more effectively absorbed.

The plate-like spring 5 is interposed in the electrode portion 3 on the negative electrode side, so that no electrical corrosion occurs.

Next, the structure of fixing the positive electrode terminal 8 and the negative electrode terminal 9 attached to the lid 10 will be described. FIG.
Is a sectional view of, for example, a lid portion to which the positive electrode terminal 8 is fixed.

According to FIG. 9, a metal lead rod 8c made of, for example, iron or steel is welded to a cylindrical aluminum body 8a having a flat plate portion 8b formed at one end thereof.
The portion of the positive electrode terminal 8 excluding the flat portion 8b of the body portion 8a from the vicinity of the base of the lead rod 8c is resin-molded and fixed to the cylindrical boss portion 10a of the lid 10.

By the way, a V-shaped groove 10b is formed in the boss 10a at the base periphery from which the body 8a of the positive electrode terminal 8 projects, and a thermosetting resin 11 (such as an epoxy resin) is formed in the V-groove 10b. The portion indicated by the dots in FIG. 9 is hereinafter referred to as a potting material).

Thus, by filling the potting material 11 into the base of the molded body 10a, the metal positive electrode terminal 8 and the resin lid 10 can be securely brought into close contact with each other. In particular, V-groove 10b formed at the root
The boss 10a and the torso 8 are formed without rising and accumulating at the base of the torso 8a by making the flow of the potting material 11 good.
Since it is inserted into the gap a, the adhesiveness is further improved and the filling operation of the potting material 11 becomes easy.

According to another embodiment shown in FIG.
The boss 10a is provided on the outer periphery of the cylindrical boss 10a.
A metal cylinder 12 is fitted in a more protruding form,
Further, the potting material 1 is provided in the space inside the protruding portion.
1 is filled.

That is, by fitting the cylindrical body 12,
Deformation and deterioration of the boss portion 10a at high temperatures are prevented, so that no gap is formed at the joint surface between the resin portion and the metal portion. Furthermore, a higher sealing property can be obtained in the mold portion of the positive electrode terminal 8 due to a synergistic effect with the adhesion action of the potting material 11 filled inside the protruding portion. Of course, also in this case, the V-groove 10b is formed in the boss 10a.

The fixing structure is applied not only to the positive terminal 8 but also to the negative terminal 9.

FIG. 23 is a sectional view of, for example, a lid portion to which the positive electrode terminal 8 is fixed, and FIG.
This shows another embodiment.

In the present embodiment, as shown in FIG. 23 (a), a groove 24 is formed so as to surround the root periphery of the boss 10a of the lid 10, and a plurality of grooves 24 are formed in the groove 24. (Four in the embodiment) reinforcing ribs 25 are provided radially from the base of the boss 10a. Thus, by providing a groove on the peripheral edge of the boss portion 10a,
The resin uniformly adheres to both terminals, and during the resin molding (insert molding) of the positive electrode terminal 8 and the negative electrode terminal 9 described above, the resin cooled at the time of molding is entangled with the terminal portion and solidifies first, and The disadvantage that the adhesion pressure of the resin is weakened is eliminated.

Further, by providing the plurality of ribs 25 in the groove 24, the root portion of the boss 10a weakened by the formation of the groove 24 is reinforced, and the strength of the boss 10a can be secured.

FIG. 11 is a partial sectional view of the lid 10 showing an embodiment of the explosion-proof mechanism.

The explosion-proof mechanism breaks when the internal pressure of the outer case 7 exceeds a predetermined pressure, and discharges the gas in the case to the outside to prevent the case from exploding.
As shown in the figure, the thick portion 14 is formed at the center of the thin portion 13.

By making the central portion of the thin portion 13 thicker than the periphery as described above, the flow of the resin in the thin portion at the time of molding the lid 10 is improved, and the variation in the molding thickness (the resin thickness of the thin portion 13) is reduced. Because of the suppression, the operating pressure of the explosion-proof mechanism can always be kept constant, and the strength of the thin portion 13 is reinforced by the thick portion 14, and in particular, the lid 10 and the outer case 7
The breakage accident at the time of sealing is prevented.

In the present embodiment, the explosion-proof mechanism is provided on the lid 10.
May be provided.

Then, next, based on FIGS. 21 and 22,
An embodiment in which the explosion-proof mechanism is provided on the outer case 7 will be described.

When the internal pressure of the cell increases, the outer case 7
The most easily deformed part is the surface with the largest area.
And it is the central part. Therefore, as shown in FIG. 21A, by providing the thin portion 13 in this portion, the explosion-proof mechanism can be reliably operated. Exterior case 7
In the case where the thin portion 13 is provided, a weld 23 is likely to occur in a mold portion formed after the thin portion 13 during injection molding. In particular, the weld 2 near the opening of the outer case 7
When 3 occurs, when the lid 10 is welded, the welding strength at that portion decreases, and the sealing performance of the cell is impaired.
Therefore, in the present embodiment, the thin portion 13 is
22 (c), a Y-shape or an inverted J
It was shaped like a letter or a letter. By forming the thin portion 13 in such a shape, no weld 23 is generated in a mold portion formed after the thin portion 13 during injection molding. The thin portion 13 is formed by a V-shaped groove as shown in FIG.

FIG. 12 is an external view showing a state where the electrode group 19 is housed in the outer case 7, FIG. 13 is a view showing a state where the electrode group 19 is housed in the outer case 7, and FIG. FIG. 13B is a plan view.

In FIG. 12, a plate-like spring 5 is placed substantially at the center of an electrode group 19, and these are fixed by a tape 6. On the other hand, on the upper inner wall surface of the outer case 7 opposed to the plate spring 5, along the insertion direction of the electrode group 19, a concave shape into which the plate spring 5 fixed on the electrode group 19 can be inserted. The guide groove 7a is formed, and a concave portion 7b for determining the direction of the electrode group 19 is formed at a predetermined position on the outer surface of the back surface of the outer case 7.

With the above configuration, when the electrode group 19 is stored,
By inserting the plate-shaped spring 5 while aligning it with the guide groove 7a of the outer case 7, the insertion direction of the electrode group 19, that is, the polarity of the electrode portion 3 constituting the electrode group 19 can always be set to be the same, In addition, since the storage direction of the internal electrode group 19 can be determined from the positional relationship of the concave portion 7b formed on the outer surface of the outer case, if the concave portion 7b is detected by a sensor or the like, the front and rear of the cover 10 can be closed when the lid is closed. The polarity consistency between the negative electrode terminals 8, 9 and the positive and negative electrode portions 3 housed in the case can be easily inspected.

Incidentally, the above-described polarity inspection can be performed using an inspection jig as shown in FIG. 18, for example.

As shown in FIG. 18, a lead length detecting sensor 21 is mounted on an assembly jig 20 on which the electric double layer capacitor of the present invention is set. A sensor 22 is attached. In the present embodiment, the presence or absence of the concave portion 7b of the outer case 7 is detected by the concave portion detection sensor 22 to determine the direction of the case, and at the same time, the leading end portion of the negative electrode terminal 9 is detected by the lead length detection sensor 21 and the direction of the lid 10 is detected. Is checked (when the lid 10 is set in the reverse direction, the terminal end portion cannot be detected). Therefore, by determining the polarity of the electrode portion 3 and the polarity of the positive / negative terminals 8 and 9 from the detection outputs of the concave portion detection sensor 22 and the lead length detection sensor 21, it is possible to judge whether the matching is good or not. Misbonding can be found.

Next, a method for manufacturing an electric double layer capacitor to which the present invention is applied will be described with reference to FIGS.

FIGS. 14 (a) to 14 (c) and FIGS. 15 (a) to
FIG. 15 (d) is a diagram showing a manufacturing process of the electric double layer capacitor of the present invention.

First, the activated carbon powder is formed by pressing to form a square-shaped electrode body 1. Next, a conductive adhesive 15 is applied to the inner surface of the box-shaped current collecting case 2 having the lead portion 2a, and the electrode body 1 is adhered to form two electrode portions 3, 3 (FIG. 14 ( a)).

When the conductive adhesive 15 contains, for example, graphite powder and a rubber-based binder, the electrode body 1 and the current collecting case 2 can be bonded to each other by the adhesive action of the rubber-based binder and the conductive action of the graphite powder. Electrical connection is ensured, and the electrode portion 3 with low resistance is formed.

Next, the electrodes are combined in such a manner that the electrode surfaces are brought into close contact with a separator 4 interposed therebetween, and an elastic body 5 (plate spring 5) is placed on the surface of one of the electrodes 3.
Are mounted, and these are collectively fixed with a tape 6 to form an electrode group 19 with the plate-shaped spring 5 (FIG. 14B).
).

The separator 4 is larger in size than the current collecting case 2. The separator 4 is arranged on the side opposite to the lead 2a of the current collecting case 2 so as to protrude as a tongue portion 4a. The protruding tongue portion 4a is folded back, and its tip is sandwiched under the plate spring 5.

As described above, the tension is given by folding back the tongue portion 4a, and it becomes difficult for the portion of the separator 4 in contact with the electrode surface to wrinkle, so that no gap is formed between the electrode body 1 and the separator 4.

Further, when the outer periphery of the electrode portions 3 laminated via the separator 4 is fixed with the tape 6, the electrode bodies 1 are securely adhered and fixed to each other. Therefore, even if the molding dimensions of the electrode bodies 1 are slightly varied. In addition, the gap between the opposing electrode bodies 1 can be made constant at all times, and can be easily stored in the outer case 7 described later.

The material of the separator 4 is a resin such as polypropylene (PP), polyethylene (PE) or polybutylene terephthalate (PBT), a natural material such as manila hemp, or a mixture thereof. And then surface-treated with a nonionic surfactant or the like.

Next, after the heat shrink tube is put on the lead portion 2a of the electrode portion 3 and heated and shrunk, the lead portion 2a is formed into a predetermined shape (FIGS. 14 (b) and 14 (c)).
). By covering the lead portion 2a with the resin tube 16, short-circuiting between the lead portions 2a is prevented, and the lead portion 2a is reinforced and resistant to bending.

Next, this electrode group 19 is housed in the outer case 7 having a square shape with a bottom (FIG. 15A).

At this time, since the lead portion 2a has been formed in the previous step, an accident such that the root portion of the lead portion 2a is forcibly bent and damaged at the time of storage is prevented.

After storing the electrode group 19, the electrolyte is injected into the case using the injection device 17 (FIG. 15 (b)).

When the injection is performed under reduced pressure (injection under reduced pressure), the impregnation of the electrolytic solution is improved, and the injection time is shortened.

After completion of the injection, the lead portion 2a of the positive electrode portion 3 and the flat plate portion 8b of the positive electrode terminal 8 of the lid 10 are welded, and the lead portion 2a of the negative electrode portion 3 and the flat plate of the negative electrode terminal 9 are welded. The part 9b is welded. The welding is performed by ultrasonic welding, low frequency welding, resistance welding or laser welding (FIG. 15 (c)).

By the way, in FIG. 15 (c), the welding portion (the flat plate portions 8b, 9b) of the lead portion 2a and the positive and negative bipolar terminals is formed in a flat plate shape, and these are pressed against each other and welded. , As in the other embodiments shown in FIGS. 24 and 25,
The pressed portion may have a shape that can be fitted (that is, a faston structure).

FIG. 24 shows a rectangular shape in which the welded portion (tip portion) of the lead portion 2a is bent into a U-shape and the flat plate portions 8b and 9b of the positive and negative bipolar terminals are fitted therein. The structure shown in FIG. 25 is such that the welded portions 8b and 9b of the positive and negative terminals are not crushed into a flat plate as in the previous example, but remain cylindrical, and the lead portion 2a is not crushed. It is a fitting structure of a circular shape whose tip portion is bent into a cylindrical shape. In this manner, by forming the welded portions into a shape that can be fitted, the positioning of the lead portion 2a and the flat plate portions 8b and 9b of each terminal is facilitated, and the displacement during welding is eliminated, so that the welding is reliably performed. Will be done. In particular, if the above-mentioned circular fitting structure is used, the trouble of processing the tip portions of both the positive and negative terminals into a flat plate shape is eliminated, and the directionality is reduced when the lead portion 2a is fitted. , Welding work becomes easy. In addition, if the flat plate portions 8b and 9b are cylindrical as described above, the operation of filling the boss 10a with the potting material 11 is easier than the flat plate portions.

Next, a method of manufacturing the lid 10 will be described with reference to the structural diagram of the lid shown in FIG. FIG.
16A is a front sectional view of the lid 10, FIG. 16B is a side sectional view, and FIG. 16C is a plan view.

First, a positive electrode lead rod 8c made of metal, such as iron or steel, is welded to a cylindrical aluminum body 8a having a flat plate portion 8b to produce a positive electrode terminal 8, and the dimensions of the positive electrode terminal 8 are measured by the positive electrode lead rod 8c. The negative electrode terminal 9 is manufactured using the negative electrode lead rod 9c having a short length.

Next, a pair of the positive electrode terminal 8 and the negative electrode terminal 9 is attached to a rectangular lid 10 made of resin to form lead rods 8c, 9c.
Insert molding is performed by injection molding from the vicinity of the base of c to the portion excluding the flat plate portions 8b and 9b of the body portions 8a and 9a.

In the present embodiment, when the positive electrode terminal 8 and the negative electrode terminal 9 are insert-molded, the gate for injecting the resin is positioned at an equal distance from the positive electrode terminal 8 and the negative electrode terminal 9 (FIG. 16).
(c), so that the injected resin flows evenly into the two terminals so that the positive terminal 8 and the negative terminal 9 have the same adhesion to each other. Is set as far as possible from the joint surface between the exterior case 7 and the lid 10 (that is, each terminal 8, 9
In the case of welding the lid 10 and the outer case 7 described later, the resin in the injection gate portion, which is harder than other mold portions, is considered so as not to adversely affect the quality of the welding. .

Next, a thermosetting resin is applied to the roots of the trunk portions 8a and 9a of each terminal. With this, the body 8a made of aluminum,
The joint surface between the resin 9a and the resin boss 10a is completely sealed with an adhesive.

Next, the lid 10 is fitted to the open end of the outer case 7, and the joint portion 18 is welded by ultrasonic welding, low frequency welding or heat fusion (FIG. 15 (d)).

As another example, FIG. 17A and FIG.
A sealing form as shown in (b) is also possible.

FIG. 15 shows an embodiment in which the lid 10 having a flat surface and the outer case 7 are welded. As shown in FIG. The structure in which the portion 26 is formed may be employed. With the above-described structure, the edge of the outer case 10 and burrs 27 generated during welding are caught on the convex portion 26 of the lid 10, so that the outer case 10 prevents expansion of the cell due to an increase in the internal pressure of the cell. Thus, stress is less likely to be applied to the joint 18 between the outer case 10 and the lid 10. Further, as in the present embodiment shown in FIG. 26, if a groove having a predetermined width is formed on the flat surface of the lid 10 and the outside is formed as the convex portion 26, the above-described low-frequency welding (horizontal) is performed. (Vibration is generated), but the above-described groove is not provided, and the lid 1 is simply provided.
A structure in which the outer peripheral portion of 0 is protruded in a convex shape may be used.

Thus, the manufacture of the electric double layer capacitor of the present invention is completed.

As described above, in the present embodiment, the electric double layer capacitor to which the present invention is applied has been described. However, the present invention is not limited to this, and is applicable to an electrochemical device such as a battery.

[0113]

As described above, according to the first and second aspects of the present invention, the rectangular electrode body is housed in the current collecting case provided with the lead portion, and the electrode portions (the positive electrode material and the negative electrode material) are stored. And an electrode group in which these electrode portions are stacked with a separator interposed therebetween, an electrolytic solution injected into the electrode group, a resin outer case containing the electrode group, a positive electrode terminal, The outer case is sealed by the lid, so that the electrodes inside the case can be securely adhered to each other, and these electrode bodies are collected. Since the opening end of the outer case is completely sealed by the lid body while being protected from vibration and impact by the electric case, a highly reliable and high-performance square electrochemical element can be realized. In addition, since the rectangular electrochemical element has a thin rectangular shape, its use is extremely wide.

According to the third and fourth aspects of the present invention, the current collecting case is provided with a frame to form a box, and a part thereof is extended to form a lead.

As a result, since the electrode body is protected by the peripheral frame, damage due to external impact or the like is prevented. In addition, since the lead portion and the current collecting case are shared, the work of welding the lead material can be reduced and the number of components is reduced, so that the assembly of the molded body is simplified and the workability is improved.

According to the fifth aspect of the present invention, since a slight gap G is formed between the current collecting cases facing each other, the spring pressure of the plate spring is evenly applied to the entire electrode portion. As a result, it is possible to realize a stable square-shaped electrochemical element with little variation in resistance and capacitance. Furthermore, as a result of the uniform distribution load, deformation of the current collecting case and damage to the internal electrode body are prevented, and accidents such as short-circuit between the positive electrode and the negative electrode due to contact between the electrodes are also prevented.

Further, according to the invention of claims 6 to 10, since an elastic body is interposed between any one of the electrode groups and the outer case, the outer case and the electrode group are formed. Are securely fixed with an appropriate pressing force, and are excellent in vibration resistance and shock resistance, and reliability is improved.

In particular, when the elastic body is constituted by a plate-like spring formed with a plurality of ridges continuously changing in height in the longitudinal direction, the spring pressure is uniformly applied to the entire electrode portion.
Vibration resistance and impact resistance are further improved.

Further, since the elastic body is fixed together with the electrode group with a tape, the storage of the electrode group becomes easy and the interval between the electrodes can always be kept constant. Type electrochemical element can be realized.

Further, if the elastic body is provided on the electrode portion for the negative electrode, there is an advantage that electrochemical corrosion does not occur.

Further, when the elastic body is made of stainless steel, excellent elasticity and corrosion resistance are ensured.

According to the eleventh to thirteenth aspects of the present invention, the bases of the body of the positive and negative electrodes protruding inside the lid are sealed with a thermosetting resin. Adhesion with the resin lid is extremely high.

Further, since a V-shaped groove is formed in the boss portion,
Since the flow of the applied thermosetting resin becomes good and enters the gap between the boss portion and the body portion, the adhesion is further improved, and the filling of the thermosetting resin becomes easy, so that the workability is improved.

Further, when a cylindrical body is fitted to the boss portion, the cylindrical body prevents deformation and deterioration of the boss portion, so that no gap is formed on the joint surface between the resin portion and the metal portion and the inside is filled. Due to the adhesive action of the thermosetting resin, the mold portion can obtain better sealing performance.

According to the fourteenth and fifteenth aspects of the present invention, the boss is provided with a groove at the base periphery and a plurality of ribs are formed radially in the groove, so that the positive electrode terminal and the negative electrode are provided on the lid. When the terminals are molded with resin, the phenomenon of the entanglement of the cooled resin with both terminals is eliminated, and the resin uniformly adheres to each terminal. As a result, the hermeticity between the resin and the terminal is further improved. In addition, since the base of the boss is reinforced by the formation of the rib, the strength of the boss is sufficiently ensured.

According to the sixteenth and seventeenth aspects of the present invention, the explosion-proof mechanism attached to the outer case or the lid is
The structure was such that a thick portion was formed at the center of the thin portion. Since this thick portion improves the flow of resin in the thin portion and suppresses variation in molding thickness, the operating pressure of the explosion-proof mechanism can always be kept constant, and the strength of the thin portion is reinforced by the thick portion. In particular, it is possible to effectively prevent a breakage accident when the lid and the outer case are sealed.

According to the invention of claims 18 to 20, when the outer case is provided with an explosion-proof mechanism, a thin-walled portion is provided at the center of the largest surface area of the outer case which is most liable to deform due to an increase in the internal pressure of the cell. , The operation of the explosion-proof mechanism is ensured. Further, the shape of the thin portion is a Y-shape,
Alternatively, since a reverse J-shape or a -shape is adopted, welds are less likely to occur in a mold portion formed after the thin portion during injection molding, and the strength of the case can be sufficiently ensured. Welding of the body and the outer case is also ensured, and the sealing performance and safety of the cell can be improved.

According to the twenty-first and forty-ninth aspects of the present invention, a guide groove in which an elastic portion is inserted is formed on the inner wall surface of the outer case, and the direction of the electrode portion is determined on the outer surface. Since the recess is formed, the matching of the polarity between the positive and negative terminals of the lid and the positive and negative electrodes in the case can be easily checked at the time of sealing, reducing inspection man-hours and reducing polarity. Erroneous joining is prevented.

According to the invention of claims 22 and 38, the outer case and the lid are joined by ultrasonic welding, low-frequency welding or heat welding, so that the sealing performance after sealing is improved. Very well, liquid leakage is completely prevented. Furthermore, 30% to 40% of glass fiber is used for the outer case and the lid.
When polyphenylene sulfide (PPS), polybutylene terephthalate (PBT), polyphenylene ether (PPE), or the like is used, the above effect is remarkable.

According to the twenty-third to twenty-third aspects of the present invention, since the liquid crystal polymer (particularly, wholly aromatic polyester) is used for the outer case and the lid, the moisture in the air is reduced from the case to the inside of the cell. And water is not electrolyzed or chemically reacted with the organic electrolyte solution, thereby improving reliability. In addition, by mixing glass fiber or talc as a filler into the liquid crystal polymer, the anisotropy of the liquid crystal polymer can be reduced, so that the resin strength is improved (in particular, the content of the filler is 20 to 50%. The use of a liquid crystal polymer having a tensile strength of 1500 kgf / cm ² or more can greatly improve the breaking strength of the case.

According to the twenty-seventh aspect of the present invention, the rectangular electrode body is formed by press molding, and the electrode body is housed in a current collecting case provided with a lead portion to form an electrode portion. After interposing a separator between the electrode portions, the electrode portion is formed by laminating the electrode portions with the electrode surfaces facing each other to form an electrode group,
Next, an elastic body is placed on the surface of one electrode part of the electrode group, and these electrode parts and the elastic body are fixed with a tape and housed in a bottomed rectangular resin outer case. After injecting the electrolytic solution into the outer case, the leads of the current collecting case are electrically connected to the corresponding positive and negative terminals of the lid, and the outer case is sealed with the lid. With such a configuration, it is possible to manufacture a high-quality electric double capacitor having a low internal resistance, a small variation in capacitance, and excellent sealing properties.

According to the invention of claims 28 and 29, a conductive adhesive containing graphite powder and a rubber binder is applied to the inner surface of the current collecting case, and the electrode body is placed and bonded. As a result, the electrical connection between the electrode body and the current collecting case is ensured, and the internal resistance of the cell can be reduced.

According to the thirty-third aspect of the present invention, since a large-sized separator is interposed between the electrode portions and the tongue portion is folded back, tension is applied to the separator in contact with the electrode surface, and wrinkles are formed. Less likely to occur. As a result, no gap is formed between the electrode and the separator, and the internal resistance of the cell can be reduced. Also, storage in the outer case becomes easy.

According to the thirty-first aspect of the present invention, the lead portion of the current collecting case is covered with a heat-shrinkable tube and is formed, so that a short circuit of the lead portion is prevented and the lead portion is formed. It is reinforced and is resistant to bending.
In addition, by performing lead forming, bending of the base portion of the lead portion is prevented and the sealing operation is facilitated.

Further, according to the inventions of claims 32 and 33, since the welded portions of the lead portion of the current collecting case and the positive electrode terminal and the negative electrode terminal can be fitted, the lead portion and the terminals of the respective terminals can be fitted. The positioning with the flat plate portion is facilitated, and the displacement during welding is eliminated, so that welding can be performed reliably. In particular, in the case of a circular fitting shape, welding work is unnecessary since the trouble of processing the tip portions of the positive and negative bipolar terminals into a flat plate shape is eliminated and the directionality when fitting the lead portion can be ignored. And the number of steps can be reduced.
Further, if the flat plate portion is cylindrical, the filling operation of the potting material into the boss portion becomes easier as compared with the flat plate shape.

According to the thirty-fourth aspect of the present invention, in manufacturing the lid, first, lead rods having different lengths are welded to a metal body having a flat plate to respectively connect a positive electrode terminal and a negative electrode terminal. Then, the positive electrode terminal and the negative electrode terminal were paired and insert-molded in a lid. Next, a thermosetting resin was applied to the base of the body of each terminal. Thus, the joint surface between the metal body and the resin boss is completely sealed with the adhesive, so that liquid leakage from the terminal base is reliably prevented.

Further, according to the invention of claim 35 or claim 36, at the time of insert molding, the gate for injecting the resin is provided at a position equidistant from the positive terminal and the negative terminal.
The injected resin will flow evenly into both terminals,
The adhesion pressure of the resin to the bipolar terminals is equalized and the variation in the withstand voltage can be reduced, and the injection gate position is set as far as possible from the welding surface of the outer case and the lid, so that the resin in the gate part is Even if hardened from other parts, this will not adversely affect the weld quality,
The sealing performance and reliability of the welded part are improved.

According to the present invention, when the outer case is injection-molded, the resin is injected from the bottom surface of the outer case, so that the flow of the resin becomes uniform and the occurrence of weld is prevented. The strength of the case is improved. In particular, an outer case using a liquid crystal polymer having anisotropy is extremely preferable in that a weld that extremely reduces strength can be prevented.

Further, according to the thirty-ninth aspect of the present invention, since the convex portion is formed on the outer peripheral portion of the lid, the cell does not easily expand even if the internal pressure of the cell increases. Stress is no longer applied to the welded parts of the body. as a result,
As in the conventional case, the hermeticity between the outer case and the lid is impaired due to the stress caused by the increase in the internal pressure of the cell, and the internal electrolyte does not leak out, thereby improving the reliability.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an internal structure of an electric double layer capacitor of the present invention, wherein (a) is a plan sectional view and (b) is a side sectional view.

FIG. 2 is an external view of the same electric double layer capacitor.

3A is an external view of a current collecting case, and FIG. 3B is an external view of another current collecting case different from FIG.

FIG. 4 is a cross-sectional view of the outer case showing a housed state of the electrode group.

FIGS. 5A and 5B are diagrams showing an embodiment of a plate spring, wherein FIG. 5A is a plan view and FIG. 5B is a front view.

FIG. 6 is a cross-sectional view of the outer case showing a stored state of the plate spring.

FIG. 7 is an external view of a plate spring different from FIG. 5;

FIG. 8 is an external view of a plate spring different from FIG. 7;

FIG. 9 is a partial cross-sectional view of the lid.

FIG. 10 is a partial sectional view of a lid different from FIG. 9;

FIG. 11 is a sectional view of an explosion-proof mechanism.

FIG. 12 is an external view showing a state where an electrode group is housed in an outer case.

13A and 13B are diagrams showing a state in which the electrode group is housed in an outer case, wherein FIG. 13A is a front view and FIG. 13B is a plan view.

FIGS. 14 (a) to (c) are diagrams showing a manufacturing process of the electric double layer capacitor of the present invention.

FIGS. 15 (a) to (d) are views showing another manufacturing process of the electric double layer capacitor of the present invention, which is different from FIG.

FIGS. 16A and 16B are diagrams showing a schematic configuration of a lid, wherein FIG. 16A is a front sectional view, FIG. 16B is a side sectional view, and FIG. 16C is a plan view.

FIG. 17 (a) is a diagram showing a form of a seal, and FIG. 17 (b) is a diagram showing a form of a seal different from (a).

18A and 18B are diagrams showing an inspection jig, wherein FIG. 18A is a front view and FIG. 18B is a side view.

FIG. 19 is a cross-sectional view of a conventional cylindrical electrochemical device.

FIG. 20 is a sectional view of the coin-type electrochemical device.

21A is a diagram showing an outer case provided with an explosion-proof mechanism, and FIG. 21B is a partial cross-sectional view of the outer case showing the explosion-proof mechanism.

22A and 22B are diagrams showing the shape of an explosion-proof mechanism provided in an outer case, wherein FIG. 22A shows a case of a Y-shape, FIG. 22B shows a case of an inverted J-shape, and FIG.

23A and 23B show a structure of a boss portion of a lid, wherein FIG. 23A is a front sectional view and FIG. 23B is a bottom view.

FIG. 24 is a view showing a fitting structure of a lead portion of a current collector, a positive terminal, and a negative terminal.

FIG. 25 is a view showing another fitting structure of the lead portion of the current collector and the positive electrode terminal and the negative electrode terminal, which is different from FIG. 24;

FIG. 26 is a partial cross-sectional view of the rectangular electrochemical element showing a welded state of the lid and the outer case.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electrode body 2 Current collecting case 2a Lead part 2b Frame part 2c Bottom surface 3 Electrode part 4 Separator 4a Separator tongue part 5 Elastic body (plate spring) 5a Ridge part 6 Tape 7 Exterior case 7a Guide groove 7b Concave part 8 Positive electrode terminal 9 Negative terminal 8a, 9a Body 8b, 9b Flat plate 8c, 9c Lead rod 10 Lid 10a Boss 10b V-groove 11 Thermosetting resin (potting material) 12 Cylindrical body 13 Thin part 14 Thick part 15 Conductive Adhesive 16 Heat shrink tube 18 Joining surface 19 Electrode group 20 Assembly jig 21 Lead length detection sensor 22 Depression detection sensor 24 Groove 25 Rib

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masaaki Suzuki 5-36-11 Shimbashi, Minato-ku, Tokyo Inside Fuji Electric Chemical Co., Ltd. (72) Inventor Takaaki Miyashita 5-36-11 Shimbashi, Minato-ku, Tokyo Fuji Inside Electrochemical Co., Ltd. (72) Inventor Kiyoyuki Kosugi 5-36-11, Shimbashi, Minato-ku, Tokyo Fuji Electric Chemical Co., Ltd. (72) Inventor Masio Kato 5-36-11, Shimbashi, Minato-ku, Tokyo Fuji Electric Chemical (72) Inventor Minoru Chishima 5-36-11 Shimbashi, Minato-ku, Tokyo Fuji Electric Chemical Co., Ltd. (72) Inventor Hiroyuki Maeno 5-36-11 Shimbashi, Minato-ku, Tokyo Fuji Electric Chemical Co., Ltd. (72) Inventor Tatsuya Yamazaki 5-36-11 Shimbashi, Minato-ku, Tokyo Fuji Electric Chemical Co., Ltd. (72) Kazuo Takada 5-36-11 Shimbashi, Minato-ku, Tokyo Fuji Electric (72) Inventor Yukiyoshi Oya 5-36-11 Shimbashi, Minato-ku, Tokyo Fuji Electric Chemical Co., Ltd. (72) Inventor Ikuo Ohashi 5-36-11 Shimbashi, Minato-ku, Tokyo Fuji Electric Chemical (72) Inventor Yasue Nishino 5-36-11 Shimbashi, Minato-ku, Tokyo Fuji Electric Chemical Co., Ltd.

Claims (40)

[Claims] 1. An electrode group (19) in which a separator (4) is interposed between a positive electrode material and a negative electrode material, a resin outer case (7) for housing the electrode group (19), and a positive electrode terminal ( 8) and a resin lid (10) provided with a negative electrode terminal (9), and the positive electrode terminal (8) of the lid (10) corresponding to the lead portions of the positive electrode material and the negative electrode material respectively. ) And the negative electrode terminal (9), and the outer case (7) is sealed by the lid (10). 2. The electrode group (19) includes a square-shaped electrode body (1, 1) housed in a current collecting case (2, 2) provided with a lead (2a), and a positive electrode and a negative electrode. Electrode part (3,
3), a separator (4) is interposed between these electrode parts (3, 3), and the electrode body (1,
The rectangular electrochemical device according to claim 1, wherein the rectangular electrochemical device is formed so that the surfaces of (1) face each other. 3. The current collecting case (2) has a bottom surface (2).
3. The rectangular shape according to claim 1, wherein a frame portion (2b) is provided on the periphery of c), and the lead portion (2a) is integrated with the current collecting case (2). Electrochemical element. 4. The current collecting case (2), wherein the lead (2a) is formed so as to extend a part of a frame (2b) or a bottom surface (2c) of the current collecting case (2). The square electrochemical device according to claim 1 or claim 2 or claim 3. 5. The rectangular electricity according to claim 1, wherein a gap (G) is formed between the opposing current collecting cases (2). Chemical element. 6. An elastic body (5) interposed between one of the electrode portions (3) of the electrode group (19) and the outer case (7). Claim 2
3. The square electrochemical device according to item 1. 7. The elastic body according to claim 1, wherein said elastic body is a plate-like spring having a plurality of ridges having a height continuously changed along a longitudinal direction. Or the square-shaped electrochemical device according to claim 2 or 6. 8. The device according to claim 1, wherein the elastic body is fixed together with an electrode group by a tape. Square type electrochemical element. 9. The device according to claim 1, wherein the elastic body is provided on a surface of an electrode part for a negative electrode. Item 8
3. The square electrochemical device according to item 1. 10. The elastic body (5) is made of stainless steel.
A square electrochemical device according to claim 7 or claim 8 or claim 9. 11. A thermosetting resin (11) for projecting the inside of the body (8a) of the positive electrode terminal (8) and the body (9a) of the negative electrode terminal (9) protruding inside the lid (10). 2. The rectangular electrochemical device according to claim 1, wherein the device is sealed. 12. The square shape according to claim 1, wherein a V-shaped groove (10b) is formed in a boss (10a) at a root periphery of the body (8a, 9a). Electrochemical element. 13. The rectangular electrochemical device according to claim 1, wherein a cylindrical body is fitted around an outer periphery of the boss portion. 14. The square-shaped electrochemical device according to claim 1, wherein a groove (24) is provided on a peripheral edge of a root of the boss (10a). element. 15. The square-shaped electrochemical device according to claim 14, wherein a plurality of reinforcing ribs (25) are radially provided in the groove (24). 16. The exterior case (7) or the lid (1).
The rectangular electrochemical device according to claim 1, wherein a thin portion (13) is provided at an appropriate position in (0) to provide an explosion-proof mechanism. 17. The rectangular electrochemical device according to claim 1, wherein a thick portion is formed at a center of the thin portion. 18. The rectangular electrochemical element according to claim 1, wherein a thin portion is provided on a surface of the outer case having the largest area to form an explosion-proof mechanism. 19. The rectangular electrochemical device according to claim 1, wherein the thin portion is provided at a central portion of the outer case. 20. The square-type electric device according to claim 1, wherein the thin portion has a Y-shape, a J-shape, or a −-shape. Chemical element. 21. A guide groove (7a) into which an elastic body (5) fixed to the electrode portion (3) is inserted is formed on an inner wall surface of the outer case (7), and the outer case (7) is formed.
The rectangular electrochemical element according to claim 1, wherein a concave portion (7b) for determining the direction of the exterior case (7) is formed at a predetermined position on the outer surface of the rectangular electrochemical device. 22. The outer case (7) and the lid (1)
2. The rectangular electrochemical element according to claim 1, wherein the resin of 0) is polyphenylene sulfide, polybutylene terephthalate, or polyphenylene ether containing 30 to 40% of glass fiber. 3. 23. The exterior case (7) and the lid (1)
2. The rectangular electrochemical device according to claim 1, wherein a liquid crystal polymer is used in 0). 24. The rectangular electrochemical device according to claim 23, wherein the liquid crystal polymer contains 20 to 50% of glass fiber or talc as a filler. 25. The liquid crystal polymer according to claim 23, wherein the liquid crystal polymer is a wholly aromatic polyester.
5. The square electrochemical device according to 4. 26. A liquid crystal polymer having a tensile strength of 1
26. The rectangular electrochemical device according to claim 23, wherein the amount is 500 kgf / cm ² or more. 27. A current collector case (2, 2) in which a rectangular electrode body (1, 1) is formed by press molding, and the electrode body (1, 1) is provided with a lead portion (2a). To form electrode portions (3, 3). After interposing a separator (4) between the electrode portions (3, 3), the electrode portions (3, 3) are connected to the electrode bodies (1, 3). An electrode group (19) is formed by laminating the surfaces of 1) facing each other, and then an elastic body (5) is placed on the surface of one of the electrode portions (3) of the electrode group (19). And the electrodes (3, 3) and the elastic body (5) are fixed with a tape (6) and housed in an outer case (7) having a bottomed square shape made of resin. An electrolytic solution is injected into the case (7), and then the lead portions (2a,
2a) is electrically connected to the corresponding positive electrode terminal (8) and negative electrode terminal (9) of the lid (10), and the outer case (7) is sealed with a resin lid (10). A method for manufacturing a rectangular electrochemical element, wherein 28. The method according to claim 27, wherein a conductive adhesive is applied to an inner surface of the current collecting case, and the electrode body is disposed thereon. 3. The method for producing a square electrochemical device according to item 1. 29. The square electrochemical element according to claim 27, wherein the conductive adhesive (15) is a conductive adhesive containing graphite powder and a rubber-based binder. Production method. 30. A separator (4) having a size larger than that of the current collecting case (2, 2) between the electrode portions (3, 3).
And one end thereof is connected to the current collecting case (2, 2).
And a protruding part (4a) is provided so as to protrude from the opposite side of the lead part (2a, 2a), and the tongue part (4a) is folded inward and then housed in the exterior case (7). The method for producing a square electrochemical device according to claim 27. 31. The lead portions (2a, 2a) of the current collecting cases (2, 2) are covered with a heat-shrinkable tube (16) and formed into a predetermined shape, and then the lead portions (2a, 2a) are formed. 28. The method according to claim 27, wherein the positive electrode terminal (8) and the negative electrode terminal (9) of the corresponding lid (10) are connected by ultrasonic welding. . 32. A joining portion between the lead portions (2a, 2a) and the positive electrode terminal (8) and the negative electrode terminal (9) is formed into a shape that can be fitted, and after fitting, each is ultrasonically welded. The method for producing a square electrochemical device according to claim 27 or 31, wherein: 33. The method according to claim 32, wherein the fitting shape is a square shape or a circular shape. 34. In manufacturing the lid (10), first, lead rods (8c) and (9c) having different lengths are welded to metal body portions (8a) and (9a), respectively, to form a positive electrode. A terminal (8) and a negative electrode terminal (9) are formed, and then the positive electrode terminal (8) and the negative electrode terminal (9) are paired and insert-molded in a resin lid (10). The method for producing a square electrochemical device according to claim 27. 35. The method according to claim 34, wherein during the insert molding, resin is injected from a gate provided at a position equidistant from the positive electrode terminal (8) and the negative electrode terminal (9). The method for producing a square electrochemical element of the above. 36. The rectangular electric device according to claim 35, wherein the gate is provided so as to be closer to a protruding surface side of the positive electrode terminal (8) and the negative electrode terminal (9) of the lid (10). Manufacturing method of chemical element. 37. The square electrochemical device according to claim 27, wherein the outer case is formed by injecting a resin from a gate provided on a bottom surface of the outer case. Manufacturing method. 38. The outer case (7) and the lid (10)
28. The method according to claim 27, wherein the members are joined by ultrasonic welding, low-frequency welding, or heat fusion. 39. An outer peripheral portion of a surface (18) of the lid (10) to be joined to the outer case (7) is the joint surface (1).
(8) The projection is projected more convexly.
The method for producing a square electrochemical device according to claim 7 or 38. 40. The rectangular electrochemical device according to claim 1, wherein the lid is provided at an appropriate position of an assembly jig (20) to which the rectangular electrochemical device is fixed. A lead length detection sensor (21) for detecting a positive electrode terminal (8) or a negative electrode terminal (9) attached to the body (10) and a concave portion (7b) of the outer case (7);
) Are provided respectively, and the outer case (7) is provided by the recess detection sensor (22).
Of the electrode part (3, 3) in the outer case (7).
3) The polarity of the lid and the mounting direction of the lid (10) are determined by the lead length detection sensor (21), and the relationship between the direction of the outer case (7) and the mounting direction of the lid (10). A method of checking the compatibility between the polarity of the electrode portions (3, 3) and the polarity of the positive electrode terminal (8) and the negative electrode terminal (9).