JP6426934B2 - Electrochemical device and method of manufacturing the same - Google Patents

Description

  The present invention relates to an electrochemical device in which an outer package is formed of a laminated outer package and which can be easily evaluated for insulation, and to the related art.

  In recent years, with the reduction in thickness and weight of portable devices such as smartphones and tablet terminals, both sides of a metal foil can be used as an exterior material for lithium ion secondary batteries and lithium polymer secondary batteries mounted thereon instead of conventional metal cans The laminate exterior material which bonded the resin film together is used. In addition, as an application thereof, an exterior body made of a laminate exterior material is used in power devices such as large batteries, capacitors, and capacitors used for storing electricity in hybrid vehicles, electric vehicles, wind power generation, solar power generation, and night electric machines. Things are increasing.

  The laminate exterior material is based on a metal foil that becomes a barrier layer, and a film with high heat resistance and high mechanical strength is bonded to one side, and the other side is heat-sealable non-stretching that can be heat sealed. It is a general configuration to bond films together, and by using these configurations, even thin film films with a total thickness of about 0.1 mm have the function of preventing the infiltration of moisture and various gases and the function of preventing electrolyte leakage. It is easy to press at room temperature and enables simple sealing by heat sealing.

  As mentioned above, the laminate exterior material is thin and light while having the same barrier properties as conventional metal cans, and easy to seal and easy to use, while insulating resin films are on both sides of the metal foil. Because they are bonded, they can not conduct electricity like metal cans. Therefore, the tab lead connected to the positive electrode and the negative electrode of the battery body is pulled out from the outer package. Moreover, in order to evaluate the insulation of a battery, a part of resin film of the outer surface side of an exterior body is peeled off, metal foil is exposed, a voltage is applied between positive and negative tab leads, and insulation resistance is aimed at. That way is taken.

  In the above insulation inspection method, as a method of exposing the metal foil of the laminate exterior material, the film is peeled off by a physical method such as a knife or a laser, or the resin film is exposed by a chemical such as a peeling solution or strong acid or strong alkali. There is a method of peeling or melting. In these methods, preparation work before inspection takes time and effort.

  As a method of obtaining conduction with the metal foil without peeling the film, there is a method of using the metal foil exposed at the end face of the laminate outer package (see Patent Document 1). As another method, there is a method of causing a sharp edge portion of a metal terminal to be engaged with a laminate exterior material to make the metal foil conductive (see Patent Document 2). These methods do not require peeling or dissolution of the resin film to obtain continuity with the metal foil, so the preparatory work before inspection is easy.

JP 2013-157287 A (see [0089] and FIG. 9) International Publication WO2011 / 040446 (see FIG. 8)

  However, according to the method of making the metal foil conductive at the end face of the laminate exterior body of Patent Document 1, the insulation evaluation is not accurately performed because the thickness of the foil is exposed at the end face and the exposed area is small. there is a possibility.

  Further, according to the method of biting in the sharp portion of the metal terminal described in Patent Document 2, it is difficult to bit the sharp portion into the metal foil as aiming at because the layers of the laminate exterior material are thin. The insulation evaluation may not be accurately performed due to excess or deficiency of penetration depth.

  An object of the present invention is to provide an electrochemical device that can accurately and easily conduct an insulation inspection and its related technology in view of the above-mentioned technical background.

  That is, this invention has a structure as described in following [1]-[11].

[1] The tab leads are joined to the positive and negative electrodes of the device body, respectively.
The heat fusible resin layers of the laminate exterior material in which the heat resistant resin layer is attached to the first surface of the metal foil layer and the heat fusible resin layer is attached to the second surface of the exterior body face inward. A conductive terminal portion having a heat-resistant resin layer removed on a part of the outer surface of the outer package,
In the state where the end of the tab lead is pulled out from the outer package, the edge of the outer package fuses the heat-sealable resin layers of the laminate outer package material, and the device body is sealed and stored in the outer package. An electrochemical device characterized by

  [2] The electrochemical device according to the above-mentioned 1, wherein the current-carrying terminal portion of the outer package is a metal exposed portion where the metal foil layer is exposed in the entire area.

  [3] The above item 1 or 2, wherein the outer package has a recess for housing the device main body formed by plastic deformation of a laminate outer package, and the current-carrying terminal portion is formed in a portion not bent by the plastic deformation. The electrochemical device as described in 2.

  [4] The electrochemical device according to the above 3, wherein the current-carrying terminal portion is formed on the side wall or bottom wall outside the recess.

  [5] The electrochemical device according to [3], wherein the current-carrying terminal portion is formed in a heat-sealed portion in which the heat-sealable resin layers at the edge portion of the outer package are fused.

  [6] The electrochemical device according to [5], wherein the current-carrying terminal portion is formed on the side where the tab lead is not drawn out.

[7] For the electrochemical device described in any one of the preceding items 1 to 6,
And measuring the electrical resistance between the current-carrying terminal portion of the outer package and the positive electrode table or negative electrode tab lead, and testing the insulation between the outer package and the device body based on the measured electrical resistance. Method for testing the insulation of electrochemical devices.

[8] The tab leads are joined to the positive and negative electrodes of the device body, respectively.
The heat fusible resin layers of the laminate exterior material in which the heat-resistant resin layer is attached to the first surface of the metal foil layer and the heat-fusible resin layer is attached to the second surface of the exterior body face inward It has a terminal part for current supply formed by being arranged and having a heat resistant resin layer removed on a part of the outer surface of the outer package,
The device body is housed in the outer package, and the heat-sealable resin layers at the edge of the outer package are heat-sealed together in a state where the tab lead is pulled out from the outer package, thereby forming a heat seal portion. An assembling step of assembling the electrochemical device by sealing the outer package;
With respect to the electrochemical device assembled in the assembly step, the electrical resistance value between the current-carrying terminal portion of the exterior body and the positive electrode tabulate or the negative electrode tab lead is measured, and the exterior body is measured based on the measured electrical resistance value And an insulation inspection step of inspecting insulation with the device body.

  [9] The method of manufacturing an electrochemical device according to the above [8], wherein the current-carrying terminal portion is covered with an insulating material after the insulation inspection step.

  [10] The method of manufacturing an electrochemical device according to the above 8, wherein the current-carrying terminal portion is covered by folding back the heat-sealed portion of the outer package after the insulation inspection step.

  [11] An electrochemical device manufactured by the method described in any one of items 8 to 10 above.

  The electrochemical device according to the above [1] has the current-carrying terminal on which the heat-resistant resin layer has been removed on a part of the outer surface of the outer package, so the insulation between the outer package and the device body can be It can evaluate by the electrical resistance value between a terminal and one tab lead.

  In the electrochemical device according to the above [2], since the current-carrying terminal portion is a metal exposed portion where the metal foil layer is exposed in the entire region, more accurate insulation evaluation can be performed.

  In the electrochemical device according to the above [3], since the current-carrying terminal portion is formed in a portion which is not bent by plastic deformation processing of the laminate exterior material, the strength of the exterior body is maintained.

  In the electrochemical device according to the above [4], since the current-carrying terminal portion is formed on the side wall or bottom wall of the recess, the strength of the outer package is maintained.

  In the electrochemical device according to the above [5], since the current-carrying terminal portion is formed in the heat seal portion, the strength of the outer package is maintained.

  In the electrochemical device according to the above [6], since the current-carrying 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 inspection.

  In the insulation inspection method of the electrochemical device according to the above [7], since the inspection object is a device having a current-carrying terminal portion in the outer package, the preparation operation for obtaining conduction in the outer package is not required. Therefore, the insulation inspection can be performed efficiently.

  According to the method of manufacturing an electrochemical device described in the above [8], since the insulation inspection step is performed on the assembled electrochemical device, it is possible to manufacture an electrochemical device evaluated for insulation. In addition, since the insulation inspection is performed using the current-carrying terminal portion formed in the outer package, the inspection can be efficiently performed, and thus the electrochemical device can be efficiently manufactured.

  According to the method of manufacturing an electrochemical device described in the above [9], since the current-carrying terminal portion is covered with the insulating material after the insulation inspection, the metal foil layer is protected and the insulation of the outer surface of the outer package is recovered. Can. Also, the outer package is reinforced by the insulating material.

  According to the method of manufacturing an electrochemical device as described in the above [10], the conductive terminal portion is covered with the heat seal portion after the insulation inspection, so that the metal foil layer is protected and the insulation of the outer surface of the outer package is recovered. be able to. Further, the edge portion of the exterior body is reinforced by the bent heat seal portion.

  The electrochemical device described in the above [11] is a device which has been tested for insulation.

FIG. 1 is a perspective view of a laminate battery according to an embodiment of the electrochemical device of the present invention. FIG. 1B is a sectional view taken along line 1B-1B of FIG. 1A. It is a perspective view of the exterior body of the laminate exterior battery of FIG. 1A. It is explanatory drawing which shows an example of the insulation test | inspection method of the lamination exterior battery of FIG. 1A. It is sectional drawing which shows the formation method of the terminal part for electricity_supply. It is sectional drawing which shows the other formation method of the terminal part for electricity_supply. It is sectional drawing which shows the recessed part formation method of laminate exterior material. It is a perspective view which shows the laminate exterior material by which the recessed part was shape | molded. It is explanatory drawing which shows the formation position of the terminal part for electricity_supply. It is sectional drawing which shows an example of the coating | coated method of the terminal part for electricity_supply. It is sectional drawing which shows the coating method of the terminal part for electricity supply formed in the side wall of the recessed part. It is sectional drawing which shows the coating method of the terminal part for electricity supply formed in the heat seal part. It is a perspective view which shows the structure of a bare cell. FIG. 6 is a bottom view of a laminate battery according to Example 2; FIG. 7 is a top view of a laminate battery according to Example 3;

  The electrochemical device of the present invention has a current-carrying terminal portion on the outer surface of the outer package, and an insulation test is performed using this current-carrying terminal portion.

[Electrochemical device]
FIGS. 1A and 1B show a laminated battery (1) which is an embodiment of the electrochemical device of the present invention. The laminate exterior battery (1) includes an exterior body (20) made of a laminate exterior material (10), a bare cell (30), and tab leads (31) (32) joined to the positive and negative electrodes of the bare cell (30). Is equipped. The bare cell (30) corresponds to the device body in the present invention.

  As shown in FIG. 2, the exterior body (20) has a main body (21) having a rectangular recess (22) in plan view and a flange (23) extending outward from the opening edge of the three sides of the recess (22). And a lid plate (24) of the same size as the outer dimensions of the main body (21) are integrally formed of a single laminate exterior material (10), and the main body (21) and the lid plate (24) And it is produced by making in half. The recess (22) forms a storage space for the bare cell (30) by the four side walls (25) and the bottom wall (26), and the current-carrying terminal (7) is formed at the center of the outer surface of the bottom wall (26). It is done. The current-carrying terminal portion (7) is used as a current-carrying terminal portion at the time of insulation inspection described later. Further, the edge of the lid plate (24) overlapping the flange (23) and the flange (23) forms a heat seal (28a) (28b) for sealing the exterior body (20). Although an embodiment in which the main body (21) and the lid plate (24) are integrated is shown here as an example, the two may be independent of each other. However, in that case, the current-carrying terminal portions (7) are formed on the respective outer side portions.

  The heat-resistant resin layer (2) which becomes the outer layer through the first adhesive layer (5) on the first surface of the metal foil layer (4) as shown in FIG. 1B, the laminate exterior material (10) And a heat fusible resin layer (3) to be an inner layer via the second adhesive layer (6) on the second surface of the metal foil layer (4), and the metal foil layer Resin layers (2) and (3) are laminated on both sides of (4). The current-carrying terminal portion (7) is a portion where the heat-resistant resin layer (2) and the first adhesive layer (5) do not exist and the metal foil layer (4) is exposed. The conductive terminal portion (7) corresponds to the metal exposed portion in the present invention, and the metal foil layer is exposed over the entire area.

  The concave portion (22) of the exterior body (20) is a space for accommodating a bare cell, and plastic deformation such as squeeze forming, stretch forming, etc. on the laminate exterior material (10) of the flat sheet on which the current conducting terminal portion (7) is formed. It is processed and shaped.

  In the bare cell (30), one end of a strip-shaped tab lead (31) (32) is joined to each of a positive electrode and a negative electrode. Also, these tab leads (31) (32) are sandwiched by the insulating film (33) at a position overlapping with the position where the outer package is heat sealed.

  In the laminated battery (1), the flange portion (23) and the cover plate portion of the main body portion (21) in a state where the end portion of the tab lead (31) (32) is drawn from one side of the exterior body (20). The edge of (24) is heat-sealed so that the heat-fusible resin layer (3) faces each other, and the bare cell (30) is sealed and housed in the exterior body (20). The method of producing the outer package (20) and the method of assembling the laminate battery (1) will be described in detail later.

[Insulation inspection of electrochemical device]
As shown in FIG. 3 as an example, an insulation resistance measuring instrument (41) is installed between the negative electrode tab lead (32) of the laminate battery (1) and the current-carrying terminal (7) of the package (20). These are connected, and a predetermined voltage is applied to measure the resistance value. There is no problem if it is connected to the positive electrode tab lead (31) instead of the negative electrode tab lead (32). The insulation property due to internal short circuit of the laminate battery (1) is evaluated by confirming whether it is higher or lower than the reference resistance value based on the measured resistance value.

  In the above-mentioned insulation inspection, since the current-carrying terminal portion (7) of the exterior body (20) can be used as it is as one current-carrying terminal, preparation for obtaining the test terminal is unnecessary. In addition, since the current-carrying terminal portion (7) is a surface portion of the metal foil layer (4) exposed by removing the heat-resistant resin layer (2) and the first adhesive layer (4) in a planar manner, An area sufficient for the purposeful connection is secured, and an accurate insulation inspection can be performed.

  In the other current-carrying terminal, the tab leads (31) and (32) projecting from the outer package (20) can be used as they are as inspection terminals, and an area sufficient for electrical connection is secured.

[Materials of Laminated Exterior Materials]
The material of each layer constituting the laminate exterior material (10) can be any material as long as it can be used as the exterior material of the electrochemical device. Preferred materials are as follows.

(Heat resistant resin layer)
As a heat resistant resin layer (2) which is an outer side layer, a polyamide film, a polyester film, etc. are mentioned, for example, These stretched films are used preferably. Among them, a biaxially stretched polyamide film or a biaxially stretched polyester film, or a multilayer film containing them is particularly preferable in terms of moldability and strength, and further, a biaxially stretched polyamide film and a biaxially stretched polyester film are laminated. It is preferred to use a multilayer film. The polyamide film is not particularly limited, and examples thereof include 6 nylon film, 6,6 nylon film, MXD nylon film and the like. Moreover, a biaxially stretched polybutylene terephthalate (PBT) film, a biaxially stretched polyethylene terephthalate (PET) film, etc. are mentioned as a biaxially stretched polyester film.

  Further, it is also preferable to blend a lubricant and / or solid fine particles in order to improve the slipperiness of the surface of the heat resistant resin layer (2) to enhance the slidability with the molding die.

  The thickness of the heat-resistant resin layer (2) is preferably 9 μm to 50 μm. While setting it as more than the said suitable lower limit can ensure intensity | strength sufficient as a packaging material, the stress at the time of shaping | molding can be made small by setting below the said suitable upper limit, and moldability can be improved. The heat-resistant resin layer (2) may be a single layer or may be laminated in multiple layers to increase the strength and the like.

(Heat fusible resin layer)
The heat-sealable resin layer (3), which is the inner layer, has excellent chemical resistance against highly corrosive electrolytes used in lithium ion secondary batteries etc., and heat-seals on the packaging material It plays a role of giving gender.

  The heat fusible resin layer (3) is preferably a thermoplastic resin unstretched film. The thermoplastic resin unstretched film is not particularly limited, but is composed of polyethylene, polypropylene, an olefin copolymer, an acid-modified product thereof, and an ionomer thereof in terms of chemical resistance and heat sealability. Is preferred. Further, as the olefin copolymer, EVA (ethylene-vinyl acetate copolymer), EAA (ethylene-acrylic acid copolymer), and EMAA (ethylene-methacrylic acid copolymer) can be exemplified. Moreover, a polyamide film (for example, 12 nylons) and a polyimide film can also be used.

  As with the heat-resistant resin layer (2), the heat-fusible resin layer (3) is also preferably blended with a lubricant and / or solid fine particles in order to enhance the slipperiness of the surface.

  The thickness of the heat-fusible resin layer (3) is preferably set to 20 μm to 80 μm. By setting the thickness to 20 μm or more, generation of pinholes can be sufficiently prevented, and by setting the thickness to 80 μm or less, the amount of resin used can be reduced, and cost reduction can be achieved. Among them, the thickness of the heat fusible resin layer (3) is particularly preferably set to 20 μm to 50 μm. The heat fusible resin layer (3) may be a single layer or multiple layers. As a multilayer film, a three-layer film in which a random polypropylene film is laminated on both sides of a block polypropylene film can be exemplified.

(Metal foil layer)
The metal foil layer (4) plays the role of providing the laminate exterior material (1) with a gas barrier property that prevents the entry of oxygen, moisture, and an electrolytic solution. For example, aluminum foil, copper foil, nickel foil, stainless steel foil, clad foil thereof, annealed foil or unannealed foil thereof, etc. may be mentioned. It is also preferable to use a metal foil plated with a conductive metal such as nickel, tin, copper, chromium or the like, for example, a plated aluminum foil. The conductive plating film may be formed on at least a portion of the metal foil layer corresponding to the current-carrying terminal portion. In addition, it is also preferable to form the chemical conversion film by subjecting the metal foil layer (4) to the following chemical conversion treatment as the surface treatment.

(Chemical film of metal foil layer)
The outer layer and the inner layer of the laminate exterior material (10) are layers made of resin, and although there is a very small amount in these resin layers, light, oxygen and moisture may enter from the outside of the case, and from the inside There is a possibility that the electrolyte will soak. When these intruders reach the metal foil layer, they cause corrosion of the metal foil layer. In the laminate outer covering material (1) of the present invention, the corrosion resistance of the metal foil layer (4) can be improved by forming a chemical conversion film having high corrosion resistance on the surface of the metal foil layer (4).

The chemical conversion film is a film formed by subjecting the surface of the metal foil to a chemical conversion treatment, and can be formed, for example, by subjecting the metal foil to a chromate treatment and a non-chrome type chemical conversion treatment using a zirconium compound. For example, in the case of chromate treatment, an aqueous solution of a mixture of any of the following 1) to 3) is coated on 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 metal salts of fluorides and nonmetal salts of fluorides 2) Phosphoric acids, acrylic resin, chitosan derivative resin and phenolic resin And a mixture of at least one of chromic acid and a chromium (III) salt 3) phosphoric acid, acrylic resin, chitosan derivative resin, any of phenolic resins, chromic acid and chromium (III (III) ) A mixture of at least one of salts and at least one of metal salts of fluorides and nonmetal salts of fluorides

The chemical conversion film preferably has a chromium adhesion amount of 0.1 to 50 mg / m ² , and particularly preferably ² to 20 mg / m ² . A conversion coating of such thickness or chromium coverage can be made into a highly corrosion resistant molding packaging material. If it is this adhesion amount grade, in order for a chemical conversion film to form a very thin film, it does not affect insulation inspection.

  In addition, the laminate exterior material which has a chemical conversion film in any one side is also contained in this invention.

  The thickness of the metal foil layer (4) is preferably 20 μm to 200 μm. By being 20 μm or more, it is possible to prevent the occurrence of pinholes and tears during rolling and heat sealing when manufacturing metal foil, and by being 200 μm or less, it is possible to reduce stress during stretch forming and draw forming. Formability can be improved. Moreover, a weight increase and material cost can be suppressed by the thickness of a metal foil layer (4) being 200 micrometers or less.

(First adhesive layer)
The first adhesive layer (5) is a layer responsible for bonding the metal foil layer (4) and the heat resistant resin layer (2) which is the outer layer, and for example, a polyester resin as a main agent and a curing agent Adhesives containing a two-component curable polyester-urethane resin or polyether-urethane resin with a polyfunctional isocyanate compound may be mentioned.

(Second adhesive layer)
The second adhesive layer (6) is a layer responsible for bonding the metal foil layer (4) and the heat-sealable resin layer (3) which is the inner layer, and, for example, polyurethane adhesive, acrylic adhesive And an adhesive layer formed of an epoxy-based 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. In this case, the electrolytic solution resistance and the water vapor barrier property of the packaging material 1 can be improved. Moreover, when using a laminate exterior material as a battery case, it is preferable to use adhesives, such as acid-modified polypropylene and polyethylene.

  Further, the total thickness of the laminate exterior material is preferably in the range of 50 to 300 μm. If the total thickness is less than 50 μm, tears and pin holes are likely to occur during molding and heat sealing. If the total thickness exceeds 300 μm, the formability may be reduced. The thicker the laminate exterior material, the higher the material cost and the heavier the weight.

  As a method of bonding the metal foil layer (4) described above and the heat resistant resin layer (2) or the heat fusible resin layer (3), the metal foil layer (4) or the resin layer (2) (3) It is recommended to apply a liquid adhesive to either one or both, and dry-adhering the adhesive, followed by thermocompression bonding. In addition, the bonding method is not limited to the dry lamination method.

[Formation of current-carrying terminal portion and formation of exterior body]
The metal exposure part (7) used as a current-carrying terminal part at the time of insulation inspection can be formed in the process of producing a laminate exterior material, and can also be formed after production. Below, the several method of forming a metal exposure part (7) is demonstrated.

In addition, it is preferable that the conduction terminal (7) has a smaller area as long as an area in which the terminal connected to the insulation resistance measuring instrument (41) can be brought into contact is secured. Even when forming by any method, in order to utilize suitably as a terminal for electricity_supply, it is preferable that the area is 1 mm < ² > or more. The particularly preferred area is 5 to 20 mm ² .

(First method: method of forming in the process of producing a laminate exterior material: see FIG. 4)
(I) A masking tape (40) corresponding to the dimension of the current-carrying terminal (7) is attached to the first surface of the metal foil layer (4). The adhesive of this masking tape (40) has weaker adhesion than the adhesive used for bonding the metal foil layer (4) and the heat resistant resin layer (2) in the following step (ii).
(Ii) the entire surface of the metal foil layer (4) to which the masking tape (40) is attached, the entire surface of the heat resistant resin layer (2), or the entire surface of the metal foil layer (4) and the heat resistant resin layer (2) (1) Apply an adhesive to be an adhesive layer (5), bond the metal foil layer (4) and the heat-resistant resin layer (2), and cure them appropriately. The masking tape (40) is more strongly adhered to the heat resistant resin layer (2) than the metal foil layer (4). The dry lamination method mentioned above can be illustrated as a bonding method.
(Iii) A second adhesive layer (6) is formed on the second surface of the metal foil layer (4) by a known method, and the heat-fusible resin layer (3) is bonded.
(Iv) A cut is made in the periphery of the sticking part of the masking tape (40) of the heat resistant resin layer (2) to remove the heat resistant resin layer (2). Since the adhesion of the masking tape (40) to the metal foil layer (4) is weak, the masking tape (40) is peeled off from the metal foil layer (4) together with the heat resistant resin layer (2). The metal foil layer (4) is exposed at the portion where the masking tape (40) is removed, and this portion becomes the current-carrying terminal portion (7). The heat-resistant resin layer (2) is cut with a cutter knife, laser irradiation or the like.

  According to this method, since the adhesive to be the first adhesive layer (5) is not applied to the portion to be the conductive terminal portion (7), the conductive agent to which the adhesive is not attached by the peeling of the masking tape (40) The terminal portion (7) can be formed.

(Second method: Method of forming in the process of producing a laminate exterior material: see FIG. 5)
When forming the first adhesive layer (5), an adhesive is applied to the metal foil layer (4) or the heat-resistant resin layer (2) using a roll or the like having irregularities on the outer peripheral surface, An adhesive non-applied portion (8) to which the adhesive is not attached is formed. A second adhesive layer (6) is formed on the second surface of the metal foil layer (4) by a known method, and the heat-fusible resin layer (3) is bonded. Then, from the heat resistant resin layer (2) side, the heat resistant resin layer (2) is cut along the periphery of the adhesive uncoated portion (8) by laser irradiation or the like to expose the metal foil layer (4). Since the heat-resistant resin layer (2) and the metal foil layer (4) are not joined and there is no first adhesive layer (5) in the adhesive uncoated portion (8), the heat-resistant resin layer (2) The heat-resistant resin layer (2) in the adhesive uncoated portion (8) can be removed to expose the metal foil layer (4).

  According to this method, since the adhesive to be the first adhesive layer (5) is not applied to the portion to be the metal exposed portion (7), the conductive terminal (7) to which the adhesive is not attached is formed. be able to.

(Third method: Method to form after preparation of laminate exterior material)
The heat-resistant resin layer (2) is bonded to the first surface of the metal foil layer (4) by a known method, and the heat-fusible resin layer (3) is bonded to the second surface. That is, only the adhesive layer (5) (6) intervenes between the metal foil layer (4) and the resin layer (2) (3), and these adhesive layers (5) (6) A well-known laminate exterior material formed on the entire surface of

  The portion to which the metal foil layer (4) is to be exposed is irradiated with a laser from the heat resistant resin layer (2) side, and the heat resistant resin layer (2) and the first adhesive layer (5) are cauterized and removed. , Form a metal exposed portion (7). In order to expose the metal foil layer (4) in a planar manner, the laser irradiation point is moved to cauterize and remove the heat resistant resin layer (2) and the first adhesive layer (5) in the predetermined region.

  Since the first and second methods described above form the metal exposed portion (7) without attaching the adhesive to the metal foil layer (4), there is no possibility that the adhesive will remain, and the current-carrying terminal portion (7 There is a merit that the metal foil layer (4) is exposed in the entire area of (4), and a high exposed metal exposed portion (7) can be formed. More accurate insulation evaluation can be performed by forming the current-carrying terminal portion with a high degree of exposure.

  On the other hand, in the third method, since the exposed metal portion of a desired area can be formed at a desired position after laminating the respective layers, the design change of the exterior body is easy. However, since the first adhesive layer (5) formed on the metal foil layer (4) is cauterized and removed, the adhesive may remain. In the third method, the degree of exposure of the metal foil layer (4) may be inferior to those in the first and second methods, but the removed portion can be used as a conducting terminal for the insulation test. As long as it exists, this invention does not limit the formation method of a metal exposure part. As long as the heat-resistant resin layer (4) which is the outermost layer of the laminate exterior material (10) is removed, an adhesive such as a masking tape may slightly remain as a thin layer, or 7) The conductive terminal portion of the present invention (7) according to the present invention, as long as the conductivity can be confirmed in the surface of the conductive terminal portion (7) even when the partial unexposed portion of the metal foil layer (4) exists in the inside. It corresponds to).

  In the exterior body (20) having the recess (22), the laminate exterior material (10) of the flat sheet on which the current-carrying terminal portion (7) is formed is plastically deformed to form the recess (22). FIG. 6 shows a process of drawing a flat sheet laminate exterior material (10) to form a recess (22) having a square shape in plan view. A die for drawing processing (50) is a punch (51) for pressing the laminate case (10) of a flat sheet to form the inner surface shape of the recess (22), and a laminate case for pressing the punch (51) A die (53) having a square hole (52) for receiving (10) and a square hole (54) of the same size as the hole (52) of the die (53); And (5) holding the laminate exterior material (10) around it. In such drawing, as shown in FIG. 6 and FIG. 7, the bent portion (60) formed by the side wall (25) and the bottom wall (26) of the recess (22) by the shoulder portion of the punch (51). ), The bent portion (61) formed between the adjacent side walls (25) is formed, and the side wall (25) and the flange (23) of the recess (22) by the shoulder of the hole (52) of the die (53) The bending portions (62) formed between the two are formed, and the tensile force generated at the time of molding concentrates on these bending portions (60) (61) (62).

  As described above, since the heat-resistant resin layer (2) is removed, the strength of the current-carrying terminal portion (7) is lower than that of the other portions. When plastic deformation is performed so that the current-carrying terminal (7) is bent, the forming depth (height of the side wall) of the recess (22) is limited by the strength of the current-carrying terminal (7) Storage space is also limited. In addition, even if it can be molded to the intended depth without any trouble, the presence of the low-current conducting terminal (7) at the bent portion of the exterior body (20) means that the strength of the exterior body (20) is maintained. It is not preferable from the viewpoint as well. For this reason, it is preferable to form the current-carrying terminal portion (7) on the flat portion while avoiding the portion bent by the plastic deformation processing. Specifically, as shown in FIG. 8, the current-carrying terminal is located at a distance (Q) of 0.5 mm or more from the center (P) of the apex or inward corner of the bent portion (60) (61) (62). It is preferred to form the part (7). Although FIG. 8 exemplifies the bent portion (60) of the bottom wall (26) and the side wall (25) of the recess (22), the other bent portions (61) and (62) are also energized under the above one condition. It is preferable to form the terminal portion for the purpose.

  From the above point of view, in the exterior body (20) shown in FIG. 2, the preferable formation position of the current-carrying terminal portion (7) is the bottom wall (26) and the flange (23) in the main body portion (21). If the above distance conditions are satisfied, as shown in FIG. 10, it is possible to form the current-carrying terminal portion (7) on the side wall (25). In addition, since the cover plate portion (24) is flat as a whole, it is not affected by the formation of the concave portion (22), so it can be formed at an arbitrary position. However, since it is bent at the boundary line (27) between the main body part (21) and the lid plate part at the time of assembly of the laminate battery (1), it is preferable to avoid the boundary line (27) and its vicinity.

  In addition, the shape of an exterior body is not limited to what the recessed part was formed of the plastic deformation process. A bag-like exterior formed by heat sealing the opening edge by using two sheets in the flat sheet state without forming a recess in the laminated exterior material, or making two sheets face each other or folding one sheet in two The body is also included in the present invention. Since the bag-like exterior body has no bent portion, there is no position restriction of the current-carrying terminal portion (7) due to the formation of the concave portion.

[Method of manufacturing electrochemical device]
The laminated battery (1) of FIGS. 1A and 1B is assembled in the following order.
(I) A bare cell (30) is loaded into the recess (22) of the outer package (20) and the positive electrode tab lead (31) and the negative electrode tab lead (32) are placed from the side facing the lid plate portion (24) of the recess (22). Pull out the end.
(Ii) The lid plate portion (24) is bent along the boundary line (27) between the main body portion (21) of the exterior body (20) and the lid plate portion (24) to cover the body portion (21) and flange (23) Overlap the edge of the lid plate (24). The exterior body (20) has three sides open except for the side including the boundary line (27) among the four sides.
(Iii) The heat fusible resin layer (3) of the flange (23) of the main body (21) on the two sides including the side from which the tab lead (31) (32) is drawn out of the three open sides And the heat sealable resin layer (3) of the edge of the lid portion (24) are heat-sealed, and the heat seal portion (28a) located on the side in contact with the side of the tab position Form the section (28b).
(Iv) The electrolytic solution is injected into the recess (22) from one side which is open.
(V) Heat fusion of the heat fusible resin layer (3) of the flange (23) of the main body (21) and the edge of the lid (24) along the remaining side used for injection of the electrolyte The heat-resistant resin layer (3) is heat-sealed to form a heat-sealed portion (28a). As a result, heat seal parts (28a) and (28b) are formed on three sides, and the bare cell (30) is covered with the outer body (30) in a state where the end portions of the tab leads (31) and (32) are pulled out from the outer body (20). 20) Sealed and stored inside.

  The assembled laminate battery (1) is subjected to an insulation test by the method described above. In the laminate battery (1), since the current-carrying terminal portion (7) is formed on the outer package (20), the inspection can be performed efficiently. Further, based on the inspection result, it is judged whether the laminate exterior battery (1) is good or bad.

  In the laminate exterior battery (1) which has been subjected to the insulation inspection, the current-carrying terminal portion (7) is used. Since the conductive terminal portion (7) is a conductive portion to which the metal foil layer (4) is exposed, it is preferable to cover it with an insulating material to restore the insulation property of the outer surface of the exterior body (20). In addition, since the conductive terminal portion (7) is a portion where the strength is lowered by removing the heat resistant resin layer (2), the metal foil layer (4) is protected and the strength of the exterior body (20) is obtained. It is preferable to cover with an insulating material also for recovery.

  As a method of covering the said electricity supply terminal part (7), as shown in FIG. 9, there exists a method of affixing insulating materials (65), such as a resin film. If the adhesive film which apply | coated the adhesive agent to the single side | surface of a resin film is used, the terminal part (7) for electricity supply can be covered easily. As said resin film, a polyimide film, a PTFE film, and a polyester film can be illustrated. If it is this method, it can cover regardless of the shape of the exterior body (20) or the position of the current-carrying terminal (7).

  In addition, the insulating material for covering is not required to be adhered to the outer package, and the state in which the current-carrying terminal portion (7) is covered may be maintained. For example, as shown in FIG. 10, the current-carrying terminal portion (7) formed on the side wall (25) of the recess (22) is bent to the side wall (25) side by the heat seal portion (28a). (7) can be covered. Further, as shown in FIG. 11, even when the heat sealing portion (28a) is formed in the current-carrying terminal portion (7), the heat sealing portion (28a) can be covered by bending. In the former case, the heat seal portion (28a) functions as an insulating material covering the current-carrying terminal portion (7), and in the latter case, the side wall (25) of the recess (22) functions as an insulating material.

  8 to 11 omit illustration of the laminated state of the laminate exterior material.

  The tab lead (31) (32) is not drawn out from the heat seal part (28a) in the method of covering the current supply terminal part (7) by bending the heat seal part, and the current supply terminal part (7) is recessed. It is limited to the case where it is formed in the range which the heat seal part (28a) such as the side wall (25) of (22) can reach, or the case where the conduction terminal part (7) is formed in the heat seal part (28a) However, the current-carrying terminal portion (7) can be closed without adding a material such as a resin film. Also, the heat seal portion (28) may be bonded in a bent state.

  Even in the case of a bag-like exterior body having no recess, the current-carrying terminal portion can be closed by sticking a resin film or bending a heat seal portion.

  In addition, the strength improvement effect of the exterior body edge part by bending a heat seal part is obtained irrespective of the presence or absence of the terminal part for electricity_supply. For example, in the laminate external battery (1) of FIGS. 1A and 1B, since the current-carrying terminal portion (7) is formed at the center of the bottom wall (26) of the recess (22) The side wall (25) is reinforced by bending the heat seal portion (28a).

  As described above, the laminated exterior battery assembled using the exterior body having the current-carrying terminal portion does not require the preparatory work for securing conduction at the time of the insulation inspection, and the accurate inspection can be efficiently performed. As a result, the laminate battery can be manufactured efficiently. In addition, the conductive terminal after inspection can be covered with an insulating material or bent and covered with a heat seal (28a) to protect the exposed metal foil layer and restore the insulation and strength of the outer surface of the outer package. .

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

  A plurality of types of outer packagings were prepared with the presence or absence of the current-carrying terminal portion, the formation position, and the formation method changed, and laminate outer packaging batteries were manufactured using these outer packagings.

  The outer package of Examples 1 to 4 has a current-carrying terminal. Examples 1 to 3 are based on the first method among the three methods for forming the current-carrying terminal portions described above, and Example 4 is based on the third method. Moreover, the exterior body of a comparative example does not have the terminal for electricity_supply.

  The common materials and dimensions in the laminate battery of each example are as follows.

(Laminated exterior material)
Metal foil layer (4): A 40 μm thick soft aluminum foil (A8079H specified by JIS H4160) subjected to chemical conversion treatment was used. The chemical conversion treatment is performed by immersing the soft aluminum foil in a 25 ° C. aqueous solution of a mixture of polyacrylic acid, phosphoric acid, and a compound of chromium and fluorine for 5 seconds and then pulling it up and drying it in a thermostat at 150 ° C. for 30 seconds. The The amount of chromium deposited on the surface of the soft aluminum foil by this chemical conversion treatment is 3 mg / m ² per side.

Heat resistant resin layer (2): 25 μm thick biaxially stretched polyamide film Heat fusible resin layer (3): 40 μm thick unstretched polypropylene film First adhesive layer (5): two-component curable polyester- Urethane adhesive, thickness 3μm
Second adhesive layer (6): Two-component curable acid-modified polypropylene-based adhesive, coating thickness is 2 μm

(Shape of exterior body)
As shown in FIG. 2, it is a two-fold type exterior body (20) in which a main body portion (21) and a lid plate portion (24) are integrally formed of a single laminate exterior material, and a concave portion (22) The bottom wall (26) has a dimension of 100 mm × 100 mm, the height of the side wall (25) is 5 mm, and the width of the flange (23) extending from three sides of the opening edge of the recess (22) is 5 mm. Accordingly, the planar dimensions of the main body (21) and the lid plate (24) are 110 mm × 105 mm.

  Although FIG. 2 shows the exterior body (20) in which the current-carrying terminal (7) is formed on the outside of the bottom wall (26) of the recess (22), the exterior body (71) used in Example 2 And the exterior body (73) used in Example 3 have the same overall shape as the exterior body (20), and the position of the current-carrying terminal portion (7) is changed.

(Bare cell and tab lead)
As shown in FIG. 12, a 30 μm-thick polypropylene film (34), a 30 μm-thick hard aluminum foil (A1N30 specified by JIS H4160), a positive electrode (35), a 30 μm-thick polypropylene film (34) A unit obtained by overlapping negative electrodes (36) made of hard copper foil with a thickness of 30 μm was taken as one unit, and a unit obtained by overlapping 30 units was used as a bare cell (30).

  Positive electrode tab lead (31) 5 mm wide × 50 mm long × 100 μm thick soft aluminum foil, negative electrode tab lead (32) is 5 mm wide × 50 mm long × 100 μm thick copper foil and is connected to each corresponding electrode The

  The end of the positive electrode tab lead (31) was ultrasonically bonded to the end of one side of the top positive electrode (35) of the bare cell (30). The end of the negative electrode tab lead (32) was ultrasonically bonded to the end of one side of the top negative electrode (36) of the bare cell (30) at a distance of 30 mm from the positive electrode tab lead (30). In addition, the positive electrode tab lead (31) and the negative electrode tab lead (32) are insulating films (MFR 1.5 thick) made of a 100 μm thick maleic anhydride modified film (MFR 1.5) at the top and bottom of the heat seal portion of the outer package (20). 33).

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

(Electrolyte solution)
Ethylene carbonate, diethyl carbonate and dimethyl carbonate 1: 1: a LiPF ₆ was added to a mixed carbonate solution were mixed at a volume ratio, using the electrolytic solution LiPF ₆ concentration was adjusted to be 1 mol / L.

  Using the materials described above, ten laminate armored batteries were made for each example.

Example 1
An exterior body (20) shown in FIG. 2, that is, an exterior body (20) having a conducting terminal portion (7) formed at the center of the bottom wall (26) of the recess (22) is produced to produce a laminate exterior battery. did.

  A 3 mm x 3 mm masking tape (40) based on a 50 μm thick polyester is attached to the required position on the first surface of the A4 size metal foil layer (4) to form a first adhesive layer (5) An adhesive was applied and the heat resistant resin layer (2) was bonded. Since the adhesive is also applied on the masking tape (40), the masking tape (40) and the heat resistant resin layer (2) are also adhered. An adhesive serving as the second adhesive layer (6) was applied to the second surface of the metal foil layer (4), and the heat-fusible resin layer (3) was bonded. The laminate was allowed to stand in a constant temperature bath set at 40 ° C. for 72 hours to be cured, thereby forming a laminate exterior material (10) (see the upper view in FIG. 4).

  As shown in FIG. 4, the thickness of the heat resistant resin layer (2) is made with a cutter from the side of the heat resistant resin layer (4) to the periphery of the masking tape (40) with respect to the laminate exterior material (10). I made a cut. 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 expose the metal Is formed. The metal exposed portion is a current-carrying terminal portion (7).

  Next, using the drawing die (50) shown in FIG. 6 on the laminate exterior material (10) on which the current-carrying terminal portion (7) is formed, the current-carrying terminal portion (centered on the bottom wall (26) The recess (22) was shaped to position 7). In drawing, the current-carrying terminal (7) is located at the center of the top surface of the punch (51), and maintains a flat state without bending deformation during processing, and the current-carrying terminal (7) It could be processed to a predetermined depth without any damage or deformation. The laminate exterior material (10) in which the recess (22) is formed is trimmed by leaving the flange (23) on three sides of the recess (22) and trimming the lid plate portion (24) to be continuous on the other side I got the body (20).

  Bare cell in the direction in which the tab leads (31) and (32) are drawn out from the side opposite to the boundary line (27) of the main body (21) and the lid plate (24) in the recess (22) of the manufactured exterior body (20). (30) was loaded, folded in half along the boundary line (27), and the lid plate (24) was stacked on the main body (21). The two sides including the side from which the tab lead (31) (32) is drawn out of the three open sides of the recess (22) are sandwiched by metal plates heated to 200 ° C. from both sides, and a pressure of 0.3 MPa And heat for 3 seconds, heat-sealable resin layer (3) of flange (23) of main body (21) and heat-sealable resin layer (3) of edge of lid plate (24) It heat-seal | fused and the heat seal part (28a) (28b) was formed.

  After heat sealing, the above assembly was cured in a dry room with a dew point of -60 ° C. Subsequently, in the same dry room, 10 mL of an electrolyte was injected by a syringe into the recess (22) from one side opening. Subsequently, one side opened under a reduced pressure of 0.086 MPa was heat sealed in the same manner as the other two sides heat sealed to form a heat sealed portion (28a). As a result, the bare cell (30) was hermetically stored in the outer package (20), and the laminate outer battery (1) was completed.

(Example 2)
A laminate battery (70) shown in FIG. 13 was produced. In the laminated battery (70), a current-carrying terminal (7) is formed on the side of the cover plate (24) of the package (71) from which the tab leads (31) (32) are drawn. The current-carrying terminal portion (7) is located 1 mm inward from the end of the surface of the lid plate portion (24) at the center of the side of the heat seal portion (28b), and exists on the heat seal portion (28b).

  The laminate exterior battery (70) is produced in the same manner as in Example 1 except that the application position of the masking tape (40) is changed when producing the laminate exterior material (10), It was assembled with the bare cell (30).

  In the drawing of the laminate exterior material (10), the current-carrying terminal (7) is in the vicinity of the end of the lid plate (24) about 100 mm away from the recess (22). ) Is not affected by the drawing process.

(Example 3)
A laminate battery (72) shown in FIG. 14 was produced. In this laminated battery (72), the current-carrying terminal (7) is formed on the flange (23) of the side of the main body (21) of the outer package (71) from which the tab leads (31) (32) are not drawn out. ing. The conductive terminal (7) and the heat seal portion (28a) are located on the heat seal portion (28a) at the center of the side close to the inner side by 1 mm from the end of the surface of the flange (23).

  The laminate exterior battery (72) is produced in the same manner as in Example 1 except that the attachment position of the masking tape (40) is changed when producing the laminate exterior material (10), It was assembled with the bare cell (30).

  In the drawing of the laminate exterior material (10), the current-carrying terminal (7) is separated by 0.5 mm from the center of the entry corner of the bent portion of the opening edge of the recess (22). ) Was processed without damage or deformation to a predetermined depth without any problem.

(Example 4)
The position of the current-carrying terminal (7) is the center of the bottom wall (26) of the recess (22) as in the first embodiment, but the method of forming the current-carrying terminal (7) is different from that of the first embodiment.

  That is, the heat resistant resin layer (2) is bonded to the metal foil layer (4) without sticking the masking tape (40) to prepare a laminate exterior material (10), and the heat resistant resin layer (2) is produced by laser irradiation. And the 1st adhesive bond layer (4) was cauterized and removed, the metal foil layer (4) was exposed, and the terminal (7) for electricity supply was formed.

  An exterior body (20) was produced in the same manner as in Example 1 except for the method of forming the current-carrying terminal (7), and a laminate exterior battery was assembled together with the bare cell (30).

(Comparative example)
A laminate battery was produced in the same manner as in Example 1 except that the current-carrying terminal portion was not formed on the laminate case material.

  In Examples 1 to 4, the laminate exterior material (10) on which the current-carrying terminal (7) was formed was drawn to form a recess (22), but all could be processed to a depth of 5 mm without any problem. The processability was comparable to that of the laminate exterior material without the current-carrying terminal portion of the comparative example. In addition, there was no liquid leakage also in the laminate cased battery sealed after injecting the electrolytic solution.

[Insulation inspection]
An insulation resistance measuring instrument (41) was installed between the current-carrying terminal (7) and the negative electrode tab lead (32) for the laminated battery of Examples 1 to 4, and these were connected to measure the resistance value. .

  Since the laminate exterior battery of the comparative example does not have the current-carrying terminal portion, the laser irradiation is performed so that the current-carrying terminal portion (7) can be formed at the same position as in Example 1 as a preparatory work for inspection. After cutting 2), the first adhesive layer (5) was removed using ethyl acetate (solvent), and the metal foil layer was exposed to form a current-carrying terminal portion (7) for insulation inspection. . This preparatory work required 10 minutes for each. And the resistance value between the negative electrode tab lead (32) and the terminal part for electricity_supply formed by the same method as Example 1-4 was measured.

  And resistance value was measured about 10 lamination exterior batteries in each case, and when a measured value was 1 M ohm or more, it evaluated that there was no continuity. Table 1 shows the number of the 10 out of 10 that did not conduct.

[Conduction test of current-carrying terminal portion]
After the said insulation test, conduction of the current-carrying terminal was examined by the following method for the laminated battery according to Examples 1 to 4.

  A push pin was pierced at the center of the lid plate portion (24) of the exterior body (20) to make a hole penetrating the laminate exterior material (10). Thereafter, the tester was used to check the presence or absence of conduction between the current-carrying terminal (7) and the negative electrode tab lead (32). Table 1 shows the number of the 10 out of 10 that had continuity.

  The laminate exterior battery of Examples 1 to 4 has the current-carrying terminal portion in the outer package, and therefore, in the insulation test, the preparatory work for obtaining conduction with the metal foil layer of the outer package is not necessary. Moreover, from the continuity test result of the current-carrying terminal portion, the continuity of the current-carrying terminals of all of the laminate external battery was confirmed, and it was confirmed that the insulation test method and the test results were highly reliable.

  Moreover, the terminal part for electricity supply used after the insulation test is covered by bending of an insulating resin tape sticking or a heat seal part. Thus, the exposed metal foil layer is protected to insulate the outer surface of the outer package, and the outer package is reinforced.

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

1, 70, 72 ... Laminated battery
2 ... Heat resistant resin layer
3 ... Heat fusion resin layer
4 ... Metal foil layer
5: First adhesive layer
6 ... 2nd adhesive layer
7 ... Terminal part for energization (metal exposed part)
10 ... Laminate exterior material
20, 71, 73 ... exterior body
21 ... Main unit
22 ... recessed part
23 ... flange
24 ... cover plate
25: Side wall
26 ... bottom wall
27: Boundary line (folding line)
28a, 28b ... heat seal section
30 bare cell (device body)
31 positive electrode tab lead
32 negative electrode tab lead
40 masking tape
65: Resin film (insulation material)
60, 61, 62 ... bent portion

Claims (11)

Tab leads are joined to the positive and negative electrodes of the device body, respectively.
The heat fusible resin layers of the laminate exterior material in which the heat resistant resin layer is attached to the first surface of the metal foil layer and the heat fusible resin layer is attached to the second surface of the exterior body face inward. A conductive terminal portion having a heat-resistant resin layer removed on a part of the outer surface of the outer package,
With the end of the tab lead pulled out from the outer package, the device main body is sealed and stored in the outer package by the heat seal portion in which the heat fusible resin layers of the outer package are fused. It is,
An electrochemical device characterized in that the current-carrying terminal portion is covered with an insulating material .   The electrochemical device according to claim 1, wherein the current-carrying terminal portion of the outer package is a metal exposed portion where the metal foil layer is exposed in the entire area.   The said exterior body has the recessed part for device main body accommodation shape | molded by the plastic deformation process of laminate exterior material, The said terminal part for electricity_supply is formed in the part which is not bent by the said plastic deformation process. The electrochemical device as described.   The electrochemical device according to claim 3, wherein the current-carrying terminal portion is formed on a side wall or a bottom wall outside the recess. The electrochemical device according to claim 3 which is formed on the energizing terminal portion Gahi Toshiru unit.   The electrochemical device according to claim 5, wherein the current-carrying terminal portion is formed on the side where the tab lead is not drawn out.   The electrochemical device according to any one of claims 1 to 4, wherein the insulating material covering the current-carrying terminal portion is a heat seal portion.   The electrochemical device according to claim 5 or 6, wherein the insulating material covering the current-carrying terminal portion is a side wall outside the recess. Tab leads are joined to the positive and negative electrodes of the device body, respectively.
The heat fusible resin layers of the laminate exterior material in which the heat-resistant resin layer is attached to the first surface of the metal foil layer and the heat-fusible resin layer is attached to the second surface of the exterior body face inward It has a terminal part for current supply formed by being arranged and having a heat resistant resin layer removed on a part of the outer surface of the outer package,
The device body is housed in the outer package, and the heat-sealable resin layers at the edge of the outer package are heat-sealed together in a state where the tab lead is pulled out from the outer package, thereby forming a heat seal portion. An assembling step of assembling the electrochemical device by sealing the outer package;
With respect to the electrochemical device assembled in the assembling step, the electric resistance value between the current-carrying terminal portion of the outer body and the positive electrode tab lead or the negative electrode tab lead is measured, and the outer body is measured based on the measured electric resistance value And an insulation inspection process for inspecting insulation with the device body,
Wherein after the insulating inspection method of manufacturing an electrochemical device, wherein the TURMERIC covering the energization terminal portion with an insulating material. Tab leads are joined to the positive and negative electrodes of the device body, respectively.
The heat fusible resin layers of the laminate exterior material in which the heat-resistant resin layer is attached to the first surface of the metal foil layer and the heat-fusible resin layer is attached to the second surface of the exterior body face inward It has a terminal part for current supply formed by being arranged and having a heat resistant resin layer removed on a part of the outer surface of the outer package,
The device body is housed in the outer package, and the heat-sealable resin layers at the edge of the outer package are heat-sealed together in a state where the tab lead is pulled out from the outer package, thereby forming a heat seal portion. An assembling step of assembling the electrochemical device by sealing the outer package;
With respect to the electrochemical device assembled in the assembling step, the electric resistance value between the current-carrying terminal portion of the outer body and the positive electrode tab lead or the negative electrode tab lead is measured, and the outer body is measured based on the measured electric resistance value And an insulation inspection process for inspecting insulation with the device body,
Wherein after the insulating inspection method of manufacturing an electrochemical device, wherein the TURMERIC covering the energization terminal portions by folding the heat-sealed portion of the exterior body. An electrochemical device manufactured by the method according to claim 9 or 10 .

Images