KR20160014519A - Method for inspecting insulation property of electrochemical device - Google Patents

Abstract

Provided is an electrochemical device, capable of simply and accurately inspecting insulation. A device body (30) of the electrochemical device (1) is stored and sealed in an outer body (20). Tab leads (31, 32) are bonded with positive and negative electrodes of the device body (30) respectively. The outer body (20) is formed as thermal fusion resin layers of a laminate outer material, made by bonding a heat-resisting resin layer to a first surface of a metal foil layer and bonding a thermal fusion resin layer to a second surface of the same, is placed towards the inside. A conducting terminal part (7) without the heat-resisting resin layer is included in a part of an outer surface of the outer body (20). While an end part of the tab leads (31, 32) is withdrawn from the outer body (20), a soft part of the outer body (20) is fused with the thermal fusion resin layers of the laminate outer material.

Description

[0001] METHOD FOR INSPECTION INSULATION PROPERTY OF ELECTROCHEMICAL DEVICE [

TECHNICAL FIELD The present invention relates to an electrochemical device and an associated technique thereof, which can be simply evaluated in terms of insulation property, in which an external device is made of a laminate outer material.

2. Description of the Related Art In recent years, as portable equipment such as smart phones and tablet terminals have become thinner and lighter, as external materials for lithium ion secondary batteries and lithium polymer secondary batteries to be mounted thereon, Laminate sheathing with film is used. In addition, as an application thereof, in a power device such as a large-sized battery, a condenser, and a capacitor used for a shaft of a hybrid electric vehicle, an electric automobile, a wind power generator, a solar power generator and a night electric machine, an external body made of a laminate exterior material Respectively.

The laminate sheathing material is a laminate material having a metal foil serving as a barrier layer as a base on which a film having high heat resistance and high mechanical strength is stuck to one side thereof and a heat sealable non- (Moisture) and various kinds of gases and a leakage preventing function of the electrolyte even with a thin film having a total thickness of about 0.1 mm, and press molding at room temperature is easy, Thereby enabling simple sealing by the seal.

As described above, the laminate outer material has the same barrier property as the conventional metal can, and is thin and lightweight, easy to seal and easy to use. On the other hand, since the insulating resin film is stuck to both surfaces of the metal foil, I can not pass electricity like a can. Therefore, the tab lead connected to the positive electrode and the negative electrode of the battery main body is drawn out from the external body. In order to evaluate the insulation property of the battery, a method is used in which a part of the resin film on the outer surface side of the outer body is peeled off and a metal foil is exposed, and a voltage is applied between the metal tab and any one of the tab leads to measure the insulation resistance value.

As a method of exposing the metal foil of the laminate outer cover material in the above-mentioned inspecting method, there is a method of peeling the film by a physical method such as a knife or a laser or peeling or melting the resin film by a chemical such as a peeling liquid, strong acid, or strong alkali . These methods are troublesome for preparatory work before inspection.

As a method of obtaining conduction with a metal foil without peeling the film, there is a method of using a metal foil exposed on the end face of the laminate sheath (see Patent Document 1). As another method, there is a method in which a preformed portion of a metal terminal is engaged with a laminate facing member so as to be electrically connected to a metal foil (see Patent Document 2). These methods do not require peeling or dissolution of the resin film in order to obtain conduction with the metal foil, so preparation work before the inspection is simple.

Patent Document 1: JP-A-2013-157287 ([0089], see Fig. 9) Patent Document 2: International Publication No. WO2011 / 040446 ([0040], see Fig. 8)

However, in the method of conducting electrical conduction to the metal foil at the end face of the laminate outer body of Patent Document 1, the possibility that the insulation property evaluation is not accurately performed is small because the exposed area is the thickness of the foil and the exposed area is small have.

Further, in the method of engaging the preformed portion of the metal terminal described in Patent Document 2, since each layer of the laminate facing member is thin, it is difficult to cause the preformed portion to be engaged with the metal foil as intended, There is a possibility of not supporting.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an electrochemical device and its related technology which can accurately and simply inspect the insulation in view of the above technical background.

That is, the present invention has the structure described in the following [1] to [11].

[1] A tab lead is joined to the positive electrode and the negative electrode of the device body,

And the heat-sealable resin layers of the laminate outer cover material, in which the heat-sealable resin layer is joined to the first surface of the metal foil layer and the heat-sealable resin layer is joined to the second surface, Wherein a heat-resistant resin layer is removed from a part of the outer surface of the outer body,

Characterized in that the heat-sealable resin layers of the laminate outer cover are fusion-bonded with the edges of the outer cover in a state in which the end portions of the tab leads are drawn out from the outer cover, Lt; / RTI >

[2] The electrochemical device according to the above 1, wherein the permeable terminal portion of the casing is a metal exposed portion in which the metal foil layer is exposed in its entire region.

[3] The exterior body has a recess for accommodating a device body formed by plastic deformation of a laminate outer material, and the penetration terminal portion is formed on a portion not bent by the plastic deformation processing. Lt; / RTI >

[4] The electrochemical device according to the item 3, wherein the power supply terminal portion is formed on a side wall or a bottom wall outside the concave portion.

[5] The electrochemical device according to the item 3, wherein the penetration terminal portion is formed in a heat seal portion in which the heat-sealable resin layers of the edge portion of the outer body are fused together.

[6] The electrochemical device according to the item 5, wherein the power supply terminal portion is formed on a side where the tab lead is not drawn out.

[7] The electrochemical device according to any one of items 1 to 6,

Wherein an electrical resistance value between the charging terminal portion of the external body and the positive electrode tab lead or the negative electrode tab lead is measured and the insulation between the external body and the device main body is inspected on the basis of the measured electric resistance value. Insulation inspection method.

[8] A tab lead is bonded to a positive electrode and a negative electrode of a device body, respectively,

Wherein the thermoplastic resin layer is formed so that the thermoplastic resin layer is laminated on the first surface of the metal foil layer and the thermally fusible resin layer is joined to the second surface, And a thermally conductive resin layer is removed from a part of the outer surface of the outer body,

The device main body is housed in the external body and the heat sealable resin layers of the edge portions of the external body are thermally fused with each other in a state in which the tab lead is drawn out from the external body to form the heat seal portion, An assembling step of assembling the electrochemical device,

The electrical resistance value between the charging terminal portion of the external body and the positive electrode tab lead or the negative electrode tab lead is measured with respect to the electrochemical device assembled by the assembling process, And an insulation inspecting step of inspecting the insulation of the electrochemical device.

[9] The method for manufacturing an electrochemical device according to item 8, wherein the insulated terminal portion is covered with an insulating material after the inspecting step.

[10] The method of manufacturing an electrochemical device as described in the item 8, wherein after the insulating inspecting step, the heat-permeable portion of the external body is folded back to cover the heat-permeable terminal portion.

[11] An electrochemical device produced by the method according to any one of the items 8 to 10 above.

The electrochemical device according to the above item [1] is characterized in that the insulating property between the external body and the device main body is determined between the external terminal and one tab lead because the heat-resistant resin layer is partly removed from the external surface of the external body. Can be evaluated by the electric resistance value of

In the electrochemical device according to the above [2], since the penetration terminal portion is a metal exposed portion to which the metal foil layer is exposed in its entire region, it is possible to more accurately evaluate the insulation.

In the electrochemical device according to the above [3], since the penetration terminal portion is formed on the portion not bent by the plastic deformation processing of the laminate facer, the strength of the facer is maintained.

In the electrochemical device according to the above [4], since the penetration terminal portion is formed on the side wall or bottom wall of the concave portion, the strength of the case is maintained.

In the electrochemical device according to the above [5], since the penetration terminal portion is formed in the heat seal portion, the strength of the sheath is maintained.

In the electrochemical device according to the above [6], since the penetration terminal portion is formed in the heat seal portion of the side where the tab lead is not drawn out, the heat seal portion can be bent after the insulation inspecting.

Since the inspecting method of an electrochemical device according to the above [7] is a device in which an inspecting object is a device having a charging terminal portion in an external body, preparation work for obtaining conduction in the external body is not required. Therefore, the insulating property test can be performed with good efficiency.

According to the method for producing an electrochemical device described in the above [8], since the inspecting step is performed on the assembled electrochemical device, an electrochemical device having an evaluated insulating property can be produced. In addition, since the inspecting is conducted by using the penetration terminal portion formed on the external body, it is possible to perform the inspection with high efficiency and further to manufacture the electrochemical device with high efficiency.

According to the method for manufacturing an electrochemical device described in the above [9], since the penetration terminal portion is covered with the insulating material after the inspecting, the metal foil layer is protected, and the insulating property of the outer surface of the outer case can be restored. Further, the casing is reinforced by the insulating material.

According to the method for producing an electrochemical device described in the above [10], since the penetration terminal portion is covered with the heat seal portion after the insulation inspections, the metal foil layer is protected, and the insulation property of the outer surface of the sheath can be restored. Further, the bent portion of the heat seal portion reinforces the edge portion of the external body.

The electrochemical device according to the above [11] is a device which has been subjected to an insulation test.

1 (A) is a perspective view of a laminated external battery which is one embodiment of the electrochemical device of the present invention.
Fig. 1B is a cross-sectional view taken along line 1B-1B of Fig.
Fig. 2 is a perspective view of the outer body of the laminated battery of Fig. 1; Fig.
3 is an explanatory view showing an example of a method for inspecting insulation of a laminated battery of Fig. 1;
4 is a cross-sectional view showing a method of forming a penetration terminal portion.
5 is a cross-sectional view showing another method of forming the penetration terminal portion.
6 is a cross-sectional view showing a method of forming a concave portion of a laminate facing member.
7 is a perspective view showing a laminate outer member formed with recesses;
8 is an explanatory view showing a formation position of the power supply terminal portion.
9 is a cross-sectional view showing an example of a covering method of the penetration terminal portion.
10 is a cross-sectional view showing a covering method of the penetration terminal portion formed on the side wall of the concave portion.
11 is a sectional view showing a covering method of the penetration terminal portion formed in the heat seal portion.
12 is a perspective view showing a configuration of a bare cell;
13 is a bottom view of the laminated battery of Example 2. Fig.
14 is a top view of the laminate battery of Example 3. Fig.

The electrochemical device of the present invention has a permeable terminal portion on the outer surface of an external body, and inspections are conducted using the permeable terminal portion.

[Electrochemical Devices]

1 (A) and 1 (B) show a laminated external battery 1 which is an embodiment of the electrochemical device of the present invention. The laminate external battery 1 includes an external body 20 made of a laminate outer casing 10, a bare cell 30, tab leads 31 and 32 joined to the positive and negative poles of the bare cell 30, . The bare cell 30 corresponds to the device body in the present invention.

2, the casing 20 includes a concave portion 22 having a rectangular shape in plan view (in a plan view) and a flange 22 extending outwardly from the opening edge of three sides of the concave portion 22 And a cover plate portion 24 having the same dimensions as the outer circumferential dimensions of the main body portion 21 are integrally formed by a single laminate covering member 10, And is formed by folding the body portion 21 and the cover plate portion 24 in two. The concave portion 22 forms a space for accommodating the bare cell 30 by the four side walls 25 and the bottom wall 26 and the transmission terminal portion 7 is formed at the center of the outer surface of the bottom wall 26 have. The power supply terminal portion 7 is used as a power supply terminal portion in inspections to be described later. The flange 23 and the edge portion of the cover plate portion 24 overlapping the flange 23 form the heat seal portions 28a and 28b sealing the external body 20. Although an embodiment in which the main body portion 21 and the cover plate portion 24 are integrally formed is shown here as an example, the two may be independent from each other. In this case, however, the power supply terminal portions 7 are formed on the respective outer side portions.

1 (B), the laminate outer cover 10 is laminated on the first surface of the metal foil layer 4 with the heat-resistant resin layer 2 serving as the outer layer through the first adhesive layer 5, And a heat-sealable resin layer 3 as an inner layer is laminated on the second surface of the metal foil layer 4 with the second adhesive layer 6 interposed therebetween to form a resin layer 3 on both surfaces of the metal foil layer 4, (2) and (3) are stacked. The power supply terminal portion 7 is a portion where the heat resistant resin layer 2 and the first adhesive layer 5 are not present and the metal foil layer 4 is exposed. The power supply terminal portion 7 corresponds to the metal exposed portion in the present invention, and the metal foil layer is exposed in the entire region thereof.

The concave portion 22 of the exterior body 20 is a space for accommodating a bare cell and is used for draw molding, extrusion molding, or the like for the laminate outer cover 10 of the flat sheet on which the penetration terminal portion 7 is formed To thereby perform molding.

The bare cell 30 has one end of short tab-shaped tab leads 31 and 32 bonded to each of a positive electrode and a negative electrode. These tab leads 31 (32) are held in the insulating film 33 at a position overlapping with the position where the external body is heat-sealed.

The laminated battery 1 is formed in such a manner that the ends of the tab leads 31 and 32 are pulled out from one side of the external body 20 and the flange portion 23 and the cover plate portion 24 are heat-sealed so as to face the heat-sealable resin layer 3, and the bare cell 30 is hermetically encapsulated in the enclosure 20. The manufacturing method of the external body 20 and the assembling method of the laminated battery 1 will be described later in detail.

[Insulation test of electrochemical device]

3, an insulation resistance measuring instrument 41 is provided between the negative electrode tab lead 32 of the laminated battery 1 and the charging terminal portion of the casing 20, These are connected, and a predetermined voltage is applied to measure the resistance value. Further, measurement may be performed by connecting to the positive electrode tab lead 31 instead of the negative electrode tab lead 32. It is determined whether the resistance value is higher or lower than the resistance value which becomes the reference value based on the measured resistance value. Thus, the insulation property of the laminate external battery 1 due to the internal short circuit is evaluated.

In the above insulation inspection, since the power supply terminal portion 7 of the external body 20 can be used as one of the power supply terminals as it is, preparation for obtaining an inspection terminal is unnecessary. Since the heat-permeable resin layer 2 and the first adhesive layer 4 are part of the surface of the exposed metal foil layer 4 after being removed in a planar form, the power supply terminal portion 7 is sufficient for electrical connection The area can be ensured and accurate insulation inspection can be performed.

In addition, the other tab terminals can use the tab leads 31 and 32 protruding from the external body 20 as it is as an inspection terminal, and a sufficient area for electrical connection is ensured.

[Construction materials of laminate exterior material]

Any material may be used as the material of each layer constituting the laminate facing member 10 as long as it can be used as a covering member of an electrochemical device. Preferred materials are as follows.

(Heat-resistant resin layer)

As the heat resistant resin layer 2 as the outer layer, a heat resistant resin which does not melt at the heat room temperature at the time of heat sealing the exterior material is used. As the heat resistant resin, it is preferable to use a heat resistant resin having a melting point higher than the melting point of the heat sealable resin constituting the heat sealable resin layer (3) by at least 10 DEG C, It is particularly preferable to use a heat-resistant resin having a melting point. Examples thereof include a polyamide film and a polyester film, and these stretched films are preferably used. Among them, a biaxially stretched polyamide film or a biaxially stretched polyester film, or a multilayer film containing them is particularly preferable in view of moldability and strength, and a biaxially stretched polyamide film and a biaxially stretched polyester film It is preferable to use a double-layered film which has been bonded. The polyamide film is not particularly limited, and examples thereof include 6 nylon film, 6,6 nylon film and MXD nylon film. Examples of the biaxially stretched polyester film include a biaxially stretched polybutylene terephthalate (PBT) film and a biaxially stretched polyethylene terephthalate (PET) film.

It is also preferable to blend a lubricant and / or solid fine particles in order to improve slidability of the surface of the heat-resistant resin layer 2 to improve the slidability with the molding die.

The thickness of the heat resistant resin layer 2 is preferably 9 to 50 탆. By setting the upper limit to the above-mentioned appropriate lower limit value, sufficient strength can be ensured as a packaging material, and by setting the upper limit value to be less than or equal to the above-mentioned upper limit value, the stress during molding can be reduced and the formability can be improved. The heat-resistant resin layer 2 may be a single layer or may be laminated in multiple layers in order to increase the strength or the like.

(Heat-sealable resin layer)

The thermally fusible resin layer 3 as the inner layer has excellent chemical resistance against an electrolyte or the like having high corrosiveness used in a lithium ion secondary battery or the like and plays a role of imparting heat resistance to the packaging material.

The heat-sealable resin layer 3 is preferably a thermoplastic resin undrawn film. The thermoplastic resin non-stretched film is not particularly limited, but is preferably composed of polyethylene, polypropylene, olefin-based copolymer, acid-modified product thereof and ionomer from the viewpoints of chemical resistance and heat resistance. As the olefin-based copolymer, EVA (ethylene-vinyl acetate copolymer), EAA (ethylene-acrylic acid copolymer) and EMAA (ethylene-methacrylic acid copolymer) can be exemplified. A polyamide film (for example, 12 nylon) or a polyimide film may also be used.

The heat-sealable resin layer (3) is also preferably mixed with a lubricant and / or solid fine particles in order to improve the slidability of the surface, like the heat resistant resin layer (2).

The thickness of the heat-sealable resin layer 3 is preferably set to 20 to 80 탆. By setting the thickness to 20 mu m or more, the occurrence of pinholes can be sufficiently prevented, and by setting the thickness to 80 mu m or less, the amount of resin used can be reduced and the cost can be reduced. In particular, it is particularly preferable that the thickness of the heat-sealable resin layer (3) is set to 20 탆 to 50 탆. Further, the heat-sealable resin layer 3 may be a single layer or a multilayer. As the multilayered film, a three-layer film obtained by laminating a random polypropylene film on both sides of a block polypropylene film can be exemplified.

(Metal foil layer)

The metal foil layer 4 plays a role of imparting gas barrier properties to prevent penetration of oxygen, moisture, and electrolytic solution into the laminate sheath 1. For example, an aluminum foil, a copper foil, a nickel foil, a stainless foil or a clad foil thereof, an annealing foil or a smoother dough of these foils can be used. It is also preferable to use a metal foil plated with a conductive metal such as nickel, tin, copper, or chromium, for example, a plated aluminum foil. It is sufficient that the conductive plating film is formed on at least a portion corresponding to the power supply terminal portion of the metal foil layer. It is also preferable that the metal foil layer (4) is subjected to a chemical treatment as described below to form a chemical conversion coating.

(Chemical film of metal foil layer)

The outer layer and the inner layer of the laminate sheathing material 10 are made of a resin and are extremely minute in the resin layer. However, there is a possibility that light, oxygen, and moisture may enter from the outside of the case, . When these intrusions reach the metal foil layer, they become a cause of corrosion of the metal foil layer. In the laminate sheathing material (1) of the present invention, the corrosion resistance of the metal foil layer (4) can be improved by forming a chemical film having high corrosion resistance on the surface of the metal foil layer (4).

The chemical conversion film is a film formed by performing a chemical conversion treatment on the surface of a metal foil. For example, the chemical conversion film may be formed by performing a chromate treatment on a metal foil or a non-chromium conversion treatment using a zirconium compound. For example, in the case of a chromate treatment, an aqueous solution of a mixture of any of the following 1) to 3) is applied to the surface of the metal foil subjected to the degreasing treatment and then dried.

1) a mixture of phosphoric acid, chromic acid and at least one of a metal salt of a fluoride and a nonmetal salt of a fluoride

2) a mixture of phosphoric acid and at least one of an acrylic resin, a chitosan derivative resin and a phenol resin, and at least one of chromic acid and a chromium (III) salt

3) a mixture of phosphoric acid and at least one of acrylic resin, chitosan derivative resin and phenol resin, at least one of chromic acid and chromium (III) salt, and at least one of a metal salt of fluoride and a nonmetal salt of fluoride

The above-mentioned chemical conversion coating is preferably 0.1 to 50 mg / m < 2 >, more preferably 2 to 20 mg / m < 2 > And they can be made into a highly corrosion-resistant molding packaging material by the chemical conversion coating of the thickness or the chromium deposition amount. If the adhesion amount is about the same, the chemical conversion coating forms an extremely thin film, so that the insulation inspection is not affected.

Also included in the present invention is a laminate covering material having a chemical conversion coating on either side.

The thickness of the metal foil layer 4 is preferably 20 to 200 mu m. It is possible to prevent occurrence of pinholes and cracks during rolling in the production of a metal foil or in a heat seal and at a thickness of 200 占 퐉 or less to reduce the stress during extrusion molding and drawing molding, Can be improved. In addition, by making the thickness of the metal foil layer 4 not more than 200 mu m, the weight increase and the material cost can be suppressed.

(First adhesive layer)

The first adhesive layer 5 is a layer for bonding the metal foil layer 4 and the heat resistant resin layer 2 as the outer layer. For example, the first adhesive layer 5 may be formed of a polyester resin as a main component and a polyfunctional isocyanate compound Curable polyester-urethane-based resin or a polyether-urethane-based resin.

(Second adhesive layer)

The second adhesive layer 6 is a layer for bonding the metal foil layer 4 and the heat-sealable resin layer 3 as the inner layer. For example, the second adhesive layer 6 may be a polyurethane adhesive, an acrylic adhesive, , A polyolefin-based adhesive, an elastomer-based adhesive, a fluorine-based adhesive, and the like. Among them, it is preferable to use an acrylic adhesive or a polyolefin adhesive, and in this case, the electrolyte solution resistance and water vapor barrier property of the packaging material 1 can be improved. When the laminate outer material is used as a battery case, it is preferable to use an acid-denatured adhesive such as polypropylene or polyethylene.

Further, the total thickness of the laminate facing member is preferably in the range of 50 to 300 mu m. When the total thickness is less than 50 mu m, breakage and pinholes are likely to occur during molding and heat sealing. If the total thickness exceeds 300 탆, the moldability may be lowered. If the laminate outer material is thickened, the material cost is high and the weight is heavy.

The metal foil layer 4 or the resin layer 2 or 3 may be used as a method of bonding the metal foil layer 4 and the heat resistant resin layer 2 or the heat sealable resin layer 3, A dry lamination method in which a liquid adhesive agent is applied to both sides, and the adhesive is dried and thermocompression-bonded is recommended. In addition, the fitting method is not limited to the dry lamination method.

[Formation of the exclusive terminal portion and molding of the external body]

The metal exposed portion 7 used as the penetration terminal portion at the time of the insulation inspecting can be formed in the process of manufacturing the laminate outer cover material and also can be formed after the fabrication. Hereinafter, a plurality of methods of forming the metal exposed portion 7 will be described.

It is preferable that the penetration terminal portion 7 be smaller if the area to be contacted with the terminal connected to the insulation resistance measuring instrument 41 is ensured. In any case, it is preferable that the area is 1 mm < 2 > or more in order to suitably use it as a communication terminal. A particularly preferable area is 5 to 20 mm 2.

(First method: a method of forming in the process of producing a laminate outer cover material: see Fig. 4)

(i) A masking tape 40 corresponding to the dimension of the power supply terminal portion 7 is attached to the first surface of the metal foil layer 4. The adhesive of the masking tape 40 has a weaker adhesive force than the adhesive used for bonding the metal foil layer 4 and the heat resistant resin layer 2 in the following step (ii).

(Ii) On the entire surface of the metal foil layer 4 to which the masking tape 40 is adhered or on the whole surface of the heat resistant resin layer 2 or on the entire surface of the metal foil layer 4 and the heat resistant resin layer 2, An adhesive serving as the layer 5 is applied, and the metal foil layer 4 and the heat-resistant resin layer 2 are cemented and cured properly. The masking tape 40 is strongly adhered to the heat resistant resin layer 2 more than the metal foil layer 4. The above-mentioned dry lamination method can be exemplified as an interlacing method.

(Iii) A second adhesive layer 6 is formed on the second surface of the metal foil layer 4 by a known technique to bond the heat-sealable resin layer 3.

(Iv) The heat-resistant resin layer 2 is removed by putting a sheath on the periphery of the attachment portion of the masking tape 40 of the heat-resistant resin layer 2. The metal foil layer 4 of the masking tape 40 The masking tape 40 is peeled off from the metal foil layer 4 together with the heat resistant resin layer 2. The portion from which the masking tape 40 is removed is removed from the exposed portion of the metal foil layer 4 And this portion serves as the nontarget terminal portion 7. The sheath on the heat resistant resin layer 2 is performed by a cutter knife, laser irradiation or the like.

According to this method, since the adhesive that becomes the first adhesive layer 5 is not applied to the portion that becomes the nontarget terminal portion 7, the nontarget terminal portion 7 ) Can be formed.

(Second method: a method of forming during the production of a laminate outer cover material: see Fig. 5)

The first adhesive layer 5 is formed by applying an adhesive to the metal foil layer 4 or the heat resistant resin layer 2 using a roll or the like having an unevenness on the outer peripheral surface thereof, Thereby forming the aspiration section 8. The second adhesive layer 6 is formed on the second surface of the metal foil layer 4 by a well-known technique to bond the heat-sealable resin layer 3. The heat-resistant resin layer 2 is then cut from the heat-resistant resin layer 2 by laser irradiation along the periphery of the adhesive not-shown portion 8 to expose the metal foil layer 4. Since the heat resistant resin layer 2 and the metal foil layer 4 are not bonded to each other and the first adhesive layer 5 is not present in the adhesive uncoated portion 8 when the heat resistant resin layer 2 is cut, 8 can be removed to expose the metal foil layer 4.

According to this method, since the adhesive which becomes the first adhesive layer 5 is not applied to the portion to be the metal exposed portion 7, the barrel-dedicated terminal portion 7 to which the adhesive is not adhered can be formed.

(Third method: a method of forming after the production of a laminate outer material)

The heat-resistant resin layer 2 is stuck to the first surface of the metal foil layer 4 and the heat-sealable resin layer 3 is stuck to the second surface. That is, only the adhesive layers 5 and 6 are interposed between the metal foil layer 4 and the resin layers 2 and 3, and these adhesive layers 5 and 6 are formed on the entire surface of the co- To produce a laminate outer cover material.

The heat resistant resin layer 2 and the first adhesive layer 5 are removed by irradiating a laser beam from the side of the heat resistant resin layer 2 to the portion where the metal foil layer 4 is desired to be exposed, To form a part (7). In order to expose the metal foil layer 4 in the form of a surface, the irradiation point of the laser is moved to abolish the heat resistant resin layer 2 and the first adhesive layer 5 in a predetermined area.

Since the first and second methods described above form the metal exposed portion 7 without adhering the adhesive to the metal foil layer 4, there is no fear that the adhesive will remain, and in the entire region of the penetration terminal portion 7 There is an advantage that the metal foil layer 4 is exposed and the metal exposed portion 7 having a high degree of exposure can be formed. By forming the power supply terminal portion having a high degree of exposure, it is possible to more accurately evaluate the insulation.

On the other hand, in the third method, since the metal exposed portion having a desired area can be formed at a desired position after the respective layers are bonded, the design of the external body is easily changed. However, since the first adhesive layer 5 formed on the metal foil layer 4 is cauterized and removed, the adhesive may remain. The third method can not be denied that the degree of exposure of the metal foil layer 4 is lower than that of the first and second methods. However, as long as the removed portion can be used as the conduction terminal portion of the insulation inspection, The method of forming the exposed portion is not limited. It is also possible that the adhesive agent such as the masking tape remains as a thin layer as long as the heat resistant resin layer 4 as the outermost layer of the laminate facing member 10 is removed, Even if the non-exposed portion of the metal foil layer 4 exists, it corresponds to the penetration terminal portion 7 of the present invention, provided that the conductivity can be confirmed in the surface of the power supply terminal portion 7.

In the case 20 having the concave portion 22, the concave portion 22 is formed by subjecting the laminate facing member 10 of the flat sheet provided with the power supply terminal portion 7 to plastic deformation processing. 6 shows a step of drawing a flat laminate sheathing 10 on a flat sheet to form a concave portion 22 having a rectangular shape in plan view. The drawing die 50 is provided with a punch 51 for pressing the laminate facer 10 of the flat sheet to form an inner surface shape of the concave portion 22 and a laminate facer 10 And has a rectangular hole 54 having the same dimensions as the hole 52 of the die 53. The holes 52 and 54 of the die 53 have a rectangular shape, And a wrinkle pusher 55 for pressing the laminate outer wrapper 10 around it. 6 and 7, the shoulder portion of the punch 51 forms a curved portion formed by the side wall 25 and the bottom wall 26 of the concave portion 22, The side wall 25 and the flange 23 of the concave portion 22 are formed by the shoulder of the hole 52 of the die 53 and the bending portion 61 formed between the side wall 25 and the adjacent side wall 25 is molded, And the tensile force generated at the time of molding is concentrated on these bending portions 60, 61, 62. The bending portions 62,

As described above, since the heat resistant resin layer 2 is removed from the power supply terminal portion 7, the strength of the power supply terminal portion 7 is lower than that of other portions. The accommodating space is also limited because the forming depth of the recess 22 (the height of the side wall) is limited by the strength of the power supply terminal portion 7 when the casting terminal portion 7 is subjected to plastic deformation processing. The presence of the barrel terminal portion 7 having a low strength in the bent portion of the sheath 20 is advantageous in that the strength of the strength of the sheath 20 can be maintained even if it can be molded into a desired depth without hindrance It is not preferable from the viewpoint of Therefore, it is preferable to form the power supply terminal portion 7 in the flat portion avoiding the bent portion by the plastic deformation processing. More specifically, as shown in Fig. 8, when the distance Q from the center P of the vertex or the corner of the bent portions 60, 61, 62 is 0.5 mm or more It is preferable to form the power supply terminal portion 7. 8 shows the bent portion 60 between the bottom wall 26 and the side wall 25 of the concave portion 22 but the other bent portions 61 and 62 also form the penetration terminal portion under the above- desirable.

2, a preferable formation position of the power supply terminal portion 7 is the bottom wall 26 and the flange 23 in the main body portion 21. [ When the above-described distance condition is satisfied, as shown in Fig. 10, the power supply terminal portion 7 may be formed on the side wall 25. Fig. Since the cover plate portion 24 is entirely flat, it is not affected by the molding of the concave portion 22, so that it can be formed at an arbitrary position. However, it is preferable to avoid the boundary line 27 and the vicinity thereof because it bends at the boundary line 27 between the main body portion 21 and the cover plate portion at the time of assembling the laminate battery 1. [

The shape of the outer body is not limited to the recess formed by the plastic deformation processing. It is possible to use the laminate outer cover material in the form of a flat sheet without molding the concave portion and to face the two sheets or to fold one sheet into two to form a bag shape formed by heat sealing the opening edges An external body is also included in the present invention. Since the bag-like outer body does not have a bent portion, there is no limitation on the position of the barrel-dedicated terminal portion 7 due to the formation of the recess.

[Manufacturing Method of Electrochemical Device]

The laminated battery 1 of FIG. 1A and the laminated battery 1 of FIG. 1B are assembled in the following order.

(i) The bare cell 30 is loaded in the concave portion 22 of the external body 20, so that the positive electrode tab lead 31 and the negative electrode tab lead 31 from one side opposed to the cover plate portion 24 of the concave portion 22, (32) is withdrawn.

(Ii) the lid plate portion 24 is bent by the boundary line 27 between the main body portion 21 of the external body 20 and the lid plate portion 24 and is covered on the main body portion 21 so that the lid plate portion 24 ). The external body 20 has three sides except for one side including the border line 27 in the four sides.

(Iii) The heat-sealable resin layer (3) of the flange (23) of the main body part (21) and the lid The heat-sealable resin layer 3 in the edge portion of the tab 24 is thermally fused to form the heat seal portion 28a positioned at the side contacting the side of the tab position and the heat seal portion 28b at the side of the tab position.

(Iv) The electrolytic solution is injected into the concave portion 22 from one opening side.

(v) The heat-sealable resin layer 3 of the flange 23 of the main body portion 21 and the heat-sealable resin layer 3 of the edge portion of the lid portion 24 are formed in the remaining one side used for injecting the electrolyte solution. And the heat seal part 28a is formed. Thereby the heat seal portions 28a and 28b are formed at the three sides and the bare cell 30 is bonded to the external body 20 in a state in which the ends of the tab leads 31 and 32 are drawn out from the external body 20. [ As shown in Fig.

The laminated battery 1 thus assembled is inspected for insulation by the above-described method. Since the laminated battery 1 is provided with the charging terminal portion 7 in the casing 20, the inspection can be conducted efficiently. Further, based on the result of the inspection, the laminate battery 1 is judged to be positive.

In the laminate battery 1 having undergone the insulation test, the charging terminal portion 7 is unnecessary. Since the power supply terminal portion 7 is a conductive portion in which the metal foil layer 4 is exposed, it is preferable to cover the insulating material to restore the insulating property of the outer surface of the external body 20. Since the power supply terminal portion 7 is also a portion where the strength is lowered by removing the heat resistant resin layer 2, it is possible to protect the metal foil layer 4 and recover the strength of the sheath 20, .

As a method of covering the power supply terminal portion 7, there is a method of attaching an insulating material 65 such as a resin film as shown in Fig. It is possible to simply cover the penetration terminal portion 7 by using an adhesive film on one side of the resin film coated with an adhesive. Examples of the resin film include a polyimide film, a PTFE film, and a polyester film. This method can cover the shape of the external body 20 and the position of the power supply terminal portion 7 regardless of the position.

Further, it is not necessary that the insulating material for covering be adhered to the external body, and it may be only necessary that the state of covering the energizing terminal portion 7 is maintained. 10, the power supply terminal portion 7 formed on the side wall 25 of the concave portion 22 is formed by bending the heat seal portion 28a toward the side wall 25, . 11, even when the penetration terminal portion 7 has the heat seal portion 28a, the heat seal portion 28a can be covered by bending the heat seal portion 28a. In the former case, the heat seal portion 28a functions as an insulating material covering the power supply terminal portion 7, and in the latter case, the side wall 25 of the recess portion 22 functions as an insulating material.

8 to 11 do not show the laminated state of the laminate outer material.

The method for covering the power supply terminal portion 7 by bending the heat seal portion is such that the tab leads 31 and 32 are not pulled out from the heat seal portion 28a and the power supply terminal portion 7 is in contact with the concave portion 22 Or the thermally conductive terminal portion 7 is formed in the heat seal portion 28a, it is possible to use the same material as that of the resin film It is possible to prevent the charging terminal portion 7 from being added. Further, the heat seal part 28 may be bonded in a bent state.

Even in the case of the bag-like outer body having no concave portion, the penetration terminal portion can be closed by bonding the resin film or bending the heat seal portion.

In addition, the effect of improving the strength of the external body edge portion by bending the heat seal portion can be obtained regardless of the presence or absence of the penetration terminal portion. For example, since the laminated battery 1 of FIGS. 1A and 1B is formed with the charging terminal portion 7 at the bottom of the bottom wall 26 of the recess 22, 9, but the side wall 25 is reinforced by bending the heat seal portion 28a.

As described above, the laminate battery assembled using the external body having the charging terminal portion does not require a preparation work for ensuring conduction at the time of inspecting the inspections, and it is possible to carry out accurate inspections efficiently, and furthermore, A battery can be manufactured. Further, the nontarized terminal portion after the inspection can be covered with the insulating material or bending the heat seal portion 28a to protect the exposed metal foil layer, thereby restoring the insulating property and strength of the outer surface of the external body.

The electrochemical device of the present invention is not limited to the laminated battery described above. Other devices include capacitors and capacitors.

[Example]

A plurality of kinds of outer materials were prepared by changing the presence, the forming position, and the forming method of the power supply terminal portions, and using these outer materials, a laminate outer battery was manufactured.

The external bodies of Examples 1 to 4 have terminals for charging. Examples 1 to 3 are based on the first method in the above-described three methods of forming the penetration terminal portions, and Example 4 is based on the third method. In addition, the external body of the comparative example does not have a communication terminal.

Materials and dimensions common to the laminated battery of each example are as follows.

(Laminate exterior material)

Metal foil layer 4: A soft aluminum foil having a thickness of 40 占 퐉 (A8079H specified in JIS H4160) was subjected to chemical conversion treatment on both sides. The chemical treatment was carried out by immersing the soft aluminum foil in a 25 ° C aqueous solution of a mixture of polyacrylic acid, phosphoric acid, chromium and a fluorine compound for 5 seconds followed by drying in a thermostatic chamber at 150 ° C for 30 seconds. The amount of chromium adhering to the surface of the soft aluminum foil by this chemical conversion treatment is 3 mg / m < 2 >

Heat resistant resin layer (2): A biaxially oriented polyamide film having a thickness of 25 mu m

Heat-sealable resin layer (3): An unstretched polypropylene film having a thickness of 40 탆

First Adhesive Layer (5): A two-liquid curable polyester-urethane adhesive, having a coating thickness of 3 탆

Second adhesive layer (6): 2-cure type acid-modified polypropylene adhesive,

(Shape of outer body)

2, the main body portion 21 and the cover plate portion 24 are two folding type external bodies 20 formed integrally with one laminate exterior member, and the bottom wall 26 of the concave portion 22 is a double- The height of the side wall 25 is 5 mm and the width of the flange 23 extending from the three sides of the opening edge of the recess 22 is 5 mm. Therefore, the plane dimension of the main body portion 21 and the cover plate portion 24 is 110 mm 105 mm.

2 shows the casing 20 in which the power supply terminal portion 7 is formed on the outer side of the bottom wall 26 of the concave portion 22. The casing body 71 used in Example 2 and the casing 3 The external shape of the external body 73 is the same as the shape of the external body 20 and the position of the power supply terminal portion 7 is changed.

(Bare cell and tab lead)

12, a polypropylene film 34 having a thickness of 30 占 퐉, a positive electrode 35 made of a hard aluminum foil having a thickness of 30 占 퐉 (A1N30 specified by JIS H4160), a polypropylene film 34 having a thickness of 30 占 퐉 ) And a negative electrode 36 made of a hard copper foil having a thickness of 30 mu m were stacked one on top of the other.

A copper foil having a width of 5 mm, a length of 50 mm and a thickness of 100 탆 was used for the positive electrode tab lead 31 and the negative electrode tab lead 32 having a width of 5 mm, a length of 50 mm and a thickness of 100 탆, And connected to a corresponding electrode.

The ends of the positive electrode tab leads 31 were ultrasonically bonded to the ends of one side of the positive electrode 35 at the top of the bare cell 30. The ends of the negative electrode tab leads 32 were separated by 30 mm from the positive electrode tab leads 30 at the ends of one side of the negative electrode 36 at the top of the bare cell 30 by ultrasonic bonding. The positive electrode tab lead 31 and the negative electrode tab lead 32 were formed in the same manner as in Example 1 except that the upper and lower portions of a predetermined portion of the heat seal portion of the external body 20 were made of a maleic anhydride modified film (MFR1.5) And the insulating film 33 was formed.

12, the connection between the electrode and the tab lead is omitted.

(Electrolytic solution)

An electrolytic solution prepared by adding LiPF ₆ to a mixed carbonate solution obtained by mixing ethylene carbonate, diethyl carbonate and dimethyl carbonate in a volume ratio of 1: 1: 1 and having a LiPF ₆ concentration of 1 mol / l was used.

Using the materials described above, ten laminate sheathed cells were produced for each example.

(Example 1)

An external body 20 in which the power supply terminal portion 7 was formed at the center of the external body 20 shown in Fig. 2, that is, the bottom wall 26 of the concave portion 22, was fabricated to produce a laminated external battery.

A 3 mm x 3 mm masking tape 40 having a thickness of 50 mu m made of polyester as a base material was affixed to a desired position of the first surface of the A4 size metal foil layer 4 to form a first adhesive layer 5) was applied, and the heat-resistant resin layer 2 was stuck together. Since the adhesive is also applied on the masking tape 40, the masking tape 40 and the heat-resistant resin layer 2 are also bonded. An adhesive serving as a second adhesive layer 6 was applied to the second surface of the metal foil layer 4 and the heat-sealable resin layer 3 was stuck together. The laminate was allowed to stand for 72 hours in a thermostatic chamber set at 40 DEG C and cured to give a laminate sheath 10 (see the upper side of Fig. 4).

4, a sheath having a depth equivalent to the thickness of the heat resistant resin layer 2 is cut around the masking tape 40 from the side of the heat resistant resin layer 4 to the laminate facing material 10 by a cutter . When the heat resistant resin layer 2 is peeled off, the masking tape 40 is also peeled off together with the heat resistant resin layer 2 and the first adhesive layer 5, and the metal foil layer 4 is exposed to form a metal exposed portion. This metal exposed portion is the penetration terminal portion (7).

Next, the casting terminal portion 7 is positioned at the center of the bottom wall 26 by using the drawing processing mold 50 shown in Fig. 6 in the laminate facing member 10 having the power supply terminal portion 7 formed thereon The concave portion 22 was formed. In the drawing processing, the penetration terminal portion 7 is located at the center of the top face of the punch 51 and remains flat without bending deformation during processing. The penetration terminal portion 7 is not damaged or deformed, It can be processed to a predetermined depth. The laminate outer cover 10 having the recess 22 is formed by trimming the outer periphery of the recessed portion 22 so that the flange 23 is left on the three sides of the recess 22 and the cover plate 24 is continuous with the remaining one side, ).

In the direction in which the tab leads 31 and 32 are pulled out from one side opposite to the boundary line 27 between the main body portion 21 and the cover plate portion 24 on the concave portion 22 of the manufactured external body 20 The bare cell 30 is loaded and the cover plate portion 24 is folded into two at the boundary line 27 to overlap the body portion 21. [ The two sides including the side where the tab leads 31 and 32 of the three sides of the recess 22 opened are drawn out are sandwiched by metal plates heated at 200 DEG C on both sides and a pressure of 0.3 MPa is applied The thermally fusible resin layer 3 of the flange 23 of the main body 21 and the thermally fusible resin layer 3 of the edge portion of the lid plate portion 24 are thermally fused to form the heat seal portion 28a) 28b were formed.

After heat sealing, the granulation was cured in a dry room at a dew point of -60 占 폚. Subsequently, in the same dry room, 10 ml of the electrolyte solution was injected into the concave portion 22 at one opening side with a syringe. Subsequently, one side opened at a reduced pressure of 0.086 MPa was heat-sealed in the same manner as the other two sides of the heat-sealed chamber to form a heat seal portion 28a. As a result, the bare cell 30 was enclosed in the enclosure 20, and the laminated battery 1 was completed.

(Example 2)

A laminated battery 70 shown in Fig. 13 was produced. This laminated battery 70 is formed with a penetration terminal portion 7 on the side where the tab leads 31 and 32 of the cover plate portion 24 of the external body 71 are drawn out. The power supply terminal portion 7 is located on the heat seal portion 28b at a position near the inner side of the end of the face of the cover plate portion 24 at the center of the side of the heat seal portion 28b by 1 mm.

The laminated battery 70 was manufactured in the same manner as in Example 1 except that the attaching position of the masking tape 40 was changed at the time of manufacturing the laminated outer casing 10, And assembled together with the bare cell 30.

In the drawing process of the laminate sheathing material 10, the penetration terminal portion 7 is in the vicinity of the end portion of the cover plate portion 24, which is about 100 mm away from the concave portion 22, I do not receive any influence by.

(Example 3)

A laminated battery 72 shown in Fig. 14 was produced. The laminated battery 72 is formed with a charging terminal portion 7 on the flange 23 on the side where the tab leads 31 and 32 of the main body portion 21 of the external body 71 are not drawn out. And is located on the heat seal part 28a at a position near the inner side of the end of the flange 23 at the center of the sides of the power supply terminal part 7 and the heat seal part 28a.

The laminated battery 72 is manufactured in the same manner as in Example 1 except that the attaching position of the masking tape 40 is changed at the time of manufacturing the laminated outer casing 10, And assembled together with the bare cell 30.

In the drawing process of the laminate facing member 10, the penetration terminal portion 7 is 0.5 mm away from the center of the corner of the bend of the opening edge of the recess 22, so that the penetration terminal portion 7 is damaged or deformed And can be processed to a predetermined depth without hindrance.

(Example 4)

Although the position of the power supply terminal portion 7 is the center of the bottom wall 26 of the recess 22 as in Embodiment 1, the method of forming the power supply terminal portion 7 differs from that of Embodiment 1.

That is, the heat-resistant resin layer 2 is stuck together without attaching the masking tape 40 to the metal foil layer 4 to prepare the laminate sheathing 10. The heat-resistant resin layer 2 and the first adhesive The layer 4 was cauterized to expose the metal foil layer 4 to form the communication terminal 7.

Except for the method of forming the conduction terminal 7, the external body 20 was manufactured in the same manner as in Example 1, and the laminate external battery was assembled together with the bare cell 30.

(Comparative example)

A laminated battery was fabricated in the same manner as in Example 1, except that no terminal for charging was formed in the laminate facer.

In Embodiments 1 to 4, the recessed portion 22 is formed by drawing the laminated outer sheath 10 having the tubing terminal 7 formed thereon, but all of them can be processed to a depth of 5 mm without any trouble. Their workability was comparable to that of a laminate outer sheath having no comparable terminal portion. Also, there was no liquid leakage even in a laminated battery in which the electrolyte was sealed after the injection.

[Insulation Test]

For the laminated battery of Examples 1 to 4, the insulation resistance measuring device 41 was provided between the charging terminal portion 7 and the negative electrode tab lead, and these were connected and the resistance value was measured.

Since the comparative laminate battery has no penetration terminal portion, laser irradiation is performed so that the penetration terminal portion 7 is formed at the same position as in Embodiment 1 and the heat-resistant resin layer 2 is cut Thereafter, the first adhesive layer 5 was removed by using ethyl acetate (solvent), and the metal foil layer was exposed to form a penetration terminal portion 7 for insulation inspection. This preparation required 10 minutes for one. Then, the resistance value between the negative electrode tab lead 32 and the penetration terminal portion formed in the same manner as in Examples 1 to 4 was measured.

In each of the examples, the resistance values of ten laminated battery cells were measured, and no conduction was evaluated when the measured value was 1 MΩ or more. Table 1 shows the number of conduction absent from the ten.

[Conductivity test of the terminal portion for charging]

After inspecting the insulation, the laminate external batteries of Examples 1 to 4 were examined for conduction of the insulated terminal by the following method.

A push pin was punched in the center of the lid plate portion 24 of the outer body 20 to make a hole penetrating the laminate outer casing 10. [ Thereafter, the presence or absence of conduction between the power supply terminal portion 7 and the negative electrode tab lead 32 was examined by a tester. Table 1 shows the number of conduction in 10 out of 10.

Since the laminated battery of Examples 1 to 4 has the charging terminal portion in the external body, preparation work for obtaining conduction with the metallic foil layer of the external body in the insulation test is unnecessary. In addition, in the conduction test results of the conduction terminal portions, conduction of the conduction terminals of all of the laminate external batteries was confirmed, and it was confirmed that the insulation test method and the test result were highly reliable.

Further, the power supply terminal portions which are not required after the insulation inspections are covered by the insulating resin tape attachment or the bending of the heat seal portion. As a result, the exposed metal foil layer is protected to insulate the outer surface of the enclosure, and the enclosure is further reinforced.

The present invention can be suitably used as an electrochemical device requiring inspection for insulation.

This application is a continuation-in-part of Japanese Patent Application No. 2014-153542 filed on July 29, 2014, which is incorporated herein by reference in its entirety.

The terms and explanations used here are used for explaining embodiments according to the present invention, and the present invention is not limited thereto. It is intended that the present invention not be limited by any of the details of the description provided herein except as defined in the appended claims.

1, 70, 72: laminate external battery
2: Heat resistant resin layer
3: Heat-sealable resin layer
4: metal foil layer
5: First adhesive layer
6: Second adhesive layer
7: Transmission terminal (metal exposed part)
10: Laminated exterior material
20, 71, 73: Exterior
21:
22:
23: Flange
24:
25: side wall
26: bottom wall
27: Boundary line (folding line)
28a and 28b:
30: Bare cell (device body)
31 Positive Tab Lead
32 negative lead tab
40 Masking tape
65: Resin film (insulating material)
60, 61, 62:

Claims (11)

Tab leads are respectively joined to the positive electrode and the negative electrode of the device body,
And the heat-sealable resin layers of the laminate outer cover material, in which the heat-sealable resin layer is joined to the first surface of the metal foil layer and the heat-sealable resin layer is joined to the second surface, Wherein a heat-resistant resin layer is removed from a part of the outer surface of the outer body,
Characterized in that the heat-sealable resin layers of the laminate facing member are fusion-bonded with each other so that the device main body is enclosed in the external body in a state in which the end portions of the tab leads are drawn out from the external body, device. The method according to claim 1,
Wherein the permeable terminal portion of the outer body is a metal exposed portion to which the metal foil layer is exposed in its entirety. The method according to claim 1,
Wherein the exterior body has a concave portion for accommodating a device body formed by plastic deformation processing of the laminate exterior member and the penetration terminal portion is formed in a portion not bent by the plastic deformation processing. The method of claim 3,
Wherein the power supply terminal portion is formed on a side wall or a bottom wall outside the concave portion. The method of claim 3,
And the nontarget terminal portion is formed in a heat seal portion in which the heat-sealable resin layers of the edge portion of the outer body are fused together. 6. The method of claim 5,
Wherein the penetration terminal portion is formed on a side where the tab lead is not drawn out. The electrochemical device according to any one of claims 1 to 6,
Wherein an electrical resistance value between the charging terminal portion of the external body and the positive electrode tab lead or the negative electrode tab lead is measured and the insulation between the external body and the device main body is inspected on the basis of the measured electric resistance value. Insulation inspection method. Tab leads are respectively joined to the positive electrode and the negative electrode of the device body,
Wherein the thermoplastic resin layer is formed so that the thermoplastic resin layer is laminated on the first surface of the metal foil layer and the thermally fusible resin layer is joined to the second surface, And a thermally conductive resin layer is removed from a part of the outer surface of the outer body,
The device main body is housed in the external body and the heat sealable resin layers of the edge portions of the external body are thermally fused with each other in a state in which the tab lead is drawn out from the external body to form the heat seal portion, An assembling step of assembling the electrochemical device,
The electrical resistance value between the charging terminal portion of the external body and the positive electrode tab lead or the negative electrode tab lead is measured with respect to the electrochemical device assembled by the assembling process, And an insulation inspecting step of inspecting the insulation of the electrochemical device. 9. The method of claim 8,
Wherein after the insulating inspecting step, the penetration terminal portion is covered with an insulating material. 9. The method of claim 8,
And after the insulating inspecting step, the heat-permeable portion of the external body is folded back to cover the heat-permeable terminal portion. An electrochemical device characterized by being manufactured by the method according to any one of claims 8 to 10.

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