JP2002107431A - Electromotive force inspecting device for battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromotive force inspecting device capable of reducing the consumption of the heat generated from a conductive layer in a film-like substrate thereof and easy to handle for user. SOLUTION: A material having a low heat conductivity is used for a film-like substrate, and the thickness of the film-like substrate is made thin. A titanium oxide pigment is mixed into a protecting layer so that using method and instruction is made easy to be seen.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery electromotive force inspection apparatus for easily inspecting the electromotive force of a battery to determine the quality of the battery.

[0002]

2. Description of the Related Art There is known a thin plate-like device for easily inspecting the electromotive force of a battery and determining the quality of the battery. Hereinafter, a conventional technique will be described with reference to FIG. In a conventional battery electromotive force inspection apparatus 101, a conductive layer 103 and a protective layer 104 are laminated on one surface of a film substrate 102, and a thermo-invariant color layer 105 and a reversible thermo-chromic layer 10 are formed on the other surface of the film substrate 102.
6 were laminated. Film-like substrate 102
Is a rectangular thin insulating layer made of resin. Further, in the related art, the film-shaped substrate 102 is made of a material having high thermal conductivity.

[0003] The conductive layer 103 is formed of a thin conductor film to allow a current to flow from a battery, and is covered with a protective layer 104 except for contact portions 107 and 108 that make contact with the battery. The conductive layer 103 has a shape that gradually becomes thinner toward the center in the length direction as shown in FIG. 3B. With this shape, the amount of heat generated by the internal resistance increases toward the center. It is configured to be large.

The protective layer 104 is formed of a transparent resin film, and is a layer for preventing the conductive layer 103 from being damaged or corroded.

The heat invariant color layer 105 is a colored layer that does not change color, and is laminated on one surface of the film substrate 102. The reversible thermochromic layer 106 is formed of a material that changes color (colors or decolors) by heat.
Are stacked on top of each other.

The thermochromic layer 105 and the reversible thermochromic layer 10
Numeral 6 is not laminated on the entire surface of the film-shaped substrate 2 but is laminated on a range along the conductive layer 3 formed on the other surface.

When using the conventional electromotive force inspection apparatus 101, the contact portions 107 and 108 are respectively brought into contact with the electrodes of the battery. As a result, a current flows through the conductive layer 103, heat is generated by the internal resistance of the conductive layer 103, and the heat is transmitted to the reversible thermochromic layer 106 via the film-like substrate 102 and the thermochromic layer 105, thereby discoloring it. Was something.

[0008]

However, the conventional battery electromotive force inspection apparatus uses a high thermal conductivity for the film substrate, so that the heat is unnecessarily spread over a wide area inside the film substrate. And the heat escaped. More specifically, in the prior art, a material having a high thermal conductivity was used for the film-like substrate, and the film-like substrate was formed to be relatively thick. Therefore, heat was excessively diffused inside the film-like substrate due to high thermal conductivity. In an actual electromotive force inspection device, the reversible thermochromic layer formed on a surface different from the conductive layer is:
It is formed only on a very small portion of the film-shaped substrate, and is laminated so as to correspond to the portion of the conductive layer which generates the largest amount of heat. On the other hand, inside the film-like substrate, a considerable amount of heat diffuses inside the film-like substrate before the reversible thermochromic layer changes color. In other words, of the heat transmitted to the film-like substrate, all the heat not contributing to the color change of the reversible thermochromic layer is wasted heat. As a result, a contradiction arises in that the battery is consumed by using the electromotive force inspection device.

Further, as described above, in the conventional electromotive force inspection apparatus, the protective layer is formed of a transparent layer, and it is not possible to describe a method of use or the like in the protective layer. As is well known, when writing a character or a picture on a canvas, for example, in the case of oil, if the color of the background is white, the color looks the clearest when the color is applied to the background. This is because white has the property of reflecting visible light of all frequencies. However, a transparent resin is applied to the protective layer of the conventional electromotive force inspection device, and the color of the conductive layer laminated on the film-shaped substrate is seen through. If the conductive layer contains copper with a relatively small internal resistance, the reddish metallic luster inherent to copper can be seen through, and it is very difficult to see the usage and precautionary notes printed on the protective layer. Occurred. If it is difficult to read precautionary statements, etc., it is conceivable that the user will perform an inspection using the wrong usage method,
In some cases, it may be harmful to the user. In view of the circumstances described above, an object of the present invention is to provide an electromotive force inspection device that can efficiently and safely inspect the electromotive force of a battery and determine the quality of the battery.

[0010]

Means for Solving the Problems As means for solving the above problems, the invention of claim 1 is characterized in that a thermochromic layer and a conductive layer or a conductive layer having thermochromic properties are laminated on a film-like substrate,
Energizing the conductive layer through the contact portion provided in the conductive layer, causing the conductive layer to generate heat and discolor the thermochromic layer or the conductive layer itself,
In a battery electromotive force inspection device that checks the quality of the battery,
The film-like substrate has a thermal conductivity of 0.2 w / m · k or less.

In the above invention, by reducing the thermal conductivity of the film-like substrate to 0.2 w / m · k or less, the heat transfer range can be narrowed and the loss can be reduced. That is, the thermal conductivity of the film substrate is 0.2 w /
If it exceeds m · k, heat is diffused inside the film-shaped substrate, and the battery is wasted. The battery electromotive force inspection apparatus of the present invention is adjusted so that the thermal conductivity of the film-shaped substrate is in the range of 0.2 w / m · k or less and that the inspection can be performed efficiently.

According to a second aspect of the present invention, a conductive layer is laminated on one surface of a film-like substrate, a thermochromic layer is laminated on the other surface, and electricity is supplied to the conductive layer through a contact portion provided on the conductive layer. In the battery electromotive force inspection device for causing the conductive layer to generate heat and discoloring the thermochromic layer to check the quality of the battery, the film-shaped substrate has a thermal conductivity of 0.01 to 0.2 w / mk. A battery electromotive force inspection device having a thickness of 0.1 to 0.3 mm.

In the above invention, the thermal conductivity of the film-like substrate is reduced while the thickness is reduced to 0.1 to 0.3 mm. That is, in the conventional electromotive force inspection apparatus, the film-shaped substrate has a high thermal conductivity and is relatively thick. Therefore, in the process in which the heat generated in the conductive layer is transmitted to the heat invariant layer through the film substrate, heat is diffused inside the film substrate before being transmitted to the heat invariant layer due to the good thermal conductivity of the film substrate. As a result, only a small portion of the heat generated in the conductive layer was actually transmitted to the heat-invariant color layer. Further, the amount of heat transmitted to the thermochromic layer is further reduced by passing through the thermochromic layer. Therefore, the present invention reduces the thermal conductivity of the film-like substrate to 0.2 w / m · k or less and further reduces the thickness of the film-like substrate to less than 0.3 mm so that heat diffusion over a wide range of the film-like substrate can be prevented. It is possible to transfer more heat to the thermochromic layer than the conventional battery electromotive force inspection device while suppressing it. However, if the thermal conductivity of the film-like substrate is less than 0.01 w / m · k, the heat of the conductive layer on one side becomes difficult to be transmitted to the thermochromic layer on the other side, which is not preferable. On the other hand, if the thickness of the film-like substrate is less than 0.1 mm, the rigidity of the film-like substrate is extremely reduced, which is not preferable.

The invention according to claim 3 is the battery electromotive force inspection apparatus according to claim 1 or 2, wherein the film-like substrate is made of polyethylene terephthalate or synthetic paper.

The battery electromotive force inspection apparatus of the invention described above uses polyethylene terephthalate or synthetic paper having a low thermal conductivity to reduce the thermal conductivity and reduce the thickness.
A better effect can be obtained. When polyethylene terephthalate is used for the film-like substrate, it is possible to laminate the conductive layer, the thermochromic layer, and the thermochromic layer only on one surface of the film-like substrate. Thereby, the heat transfer efficiency can be increased.

According to a fourth aspect of the present invention, the thermochromic layer reversibly changes color to transparent at a specific temperature or higher.
The battery electromotive force inspection device according to any one of claims 1 to 3, further comprising a thermo-invariant color layer, wherein the thermo-invariant color layer is visible when the thermo-color-change layer changes color to transparent.

In the above invention, by making the thermochromic layer transparent at a specific temperature so that the thermochromic layer is visible,
The electromotive force of the battery can be easily inspected, and the quality of the battery can be visually determined.

According to a fifth aspect of the present invention, in the battery according to any one of the first to fourth aspects, the protective layer contains a titanium oxide pigment having an average particle diameter of 0.1 μm to 0.5 μm. It is an electromotive force inspection device.

Since the protective layer of the electromotive force inspection device of the present invention contains a titanium oxide pigment, the surface of the electromotive force inspection device on which the protective layer is laminated is entirely excluding the contact portion for contacting the battery electrode. It becomes white. As a result, printing becomes possible, and usage and notes are easy to see, so that the user does not need to make an incorrect usage. The average particle size is 0.1 μm
When the average particle diameter is less than 0.1 μm, the ability to conceal the metal layer of the conductive layer is inferior, and when the average particle diameter exceeds 0.5 μm, the surface smoothness is impaired. This makes printing difficult. That is, the particle size of the titanium oxide constituting the protective layer is most suitable for the underlayer and is large enough to cover the metal color of the conductive layer.

According to a sixth aspect of the present invention, a thermochromic layer and a conductive layer, or a conductive layer having thermochromic properties are laminated on a film-like substrate, and a protective layer is laminated on the conductive layer. In the battery electromotive force inspection device for applying a current to the conductive layer through the contact portion, causing the conductive layer to generate heat, discoloring the thermochromic layer or the conductive layer itself, and checking the quality of the battery, the protective layer has an average particle size of A battery electromotive force inspection device comprising a titanium oxide pigment having a diameter of 0.1 μm to 0.5 μm.

According to the electromotive force inspection apparatus of the above invention, the titanium oxide pigment is contained in the protective layer in the same manner as the invention of the fifth aspect, and since the entire surface is white except for the contact portion, printing becomes possible. Precautionary statements are easy to see, and users do not have to use them incorrectly. Further, since the average particle diameter of the titanium oxide pigment is 0.1 μm to 0.5 μm, it is suitable as a base for printing, and has a high ability to conceal the metal color of the conductive layer.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a battery electromotive force inspection apparatus according to the present invention will be described below with reference to FIG. FIG. 1 (a)
1 is a cross-sectional view of a first embodiment of a battery electromotive force inspection apparatus of the present invention, (b) is a cross-sectional view of a second embodiment, and (c) is a back view of the electromotive force inspection apparatus. 4 shows a correlation between a conductive layer and a protective layer. An electromotive force inspection apparatus 1 shown in FIG. 1A has a conductive layer 3 and a protective layer 4 laminated on one surface of a film substrate 2, and a thermochromic layer 5 and a reversible thermochromic layer 6 on the other surface of the film substrate. Are laminated. Further, a protective layer may be newly provided on the reversible thermochromic layer 6.

The film-like substrate 2 is a square-shaped, moderately thin film. The film-shaped substrate 2 is an insulator, and is made of a material having good flexibility, which can be easily bent and restored, and which has a low thermal conductivity. It has a thermal conductivity of, for example, about 0.01 to 0.2 w / m · k, such as polyethylene terephthalate or synthetic paper, and has a thickness of about 0.1 to 0.3 mm. More preferably, the thermal conductivity is about 0.03 to 0.15 w / mk, and the thickness is about 0.15 to 0.25 mm. As the synthetic paper, for example, "Yupo (registered trademark)" manufactured by Oji Yuka Synthetic Paper Co., Ltd. is suitable.

On one surface of the film substrate 2, the conductive layer 3 and the protective layer 4 are laminated as described above. The conductive layer 3 is a layer using a thin conductor or conductive ink, and is formed by a known method such as vapor deposition of a conductor or application of a conductive ink. The conductive layer 3 may have any shape such that the center portion and the opposite end portions have different resistance values. For example, the width of the central portion is smaller than the width of both end portions. Alternatively, a cutout 9 may be provided at the center to branch the current flow path into a plurality of parts, and the width may be reduced toward the center.

The protective layer 4 is laminated on the conductive layer 3, and the conductive layers 3 and 9 are left so that the terminals of the battery to be inspected contact only the both ends of the conductive layer 3 in the longitudinal direction. 3 is an insulating layer laminated so as to cover 3. Protective layer 4
Has a function of preventing disconnection and oxidation of the conductive layer 3.
As one of the characteristic constitutions of the present invention, the protective layer 4 contains a titanium oxide pigment having an average particle diameter of 0.1 μm to 0.5 μm. This is a measure for keeping the contact portions 7 and 8 of the conductive layer 3 so that the metal color of the conductive layer 3 cannot be seen through. As a result, the metallic color of the conductive layer 3 is concealed, so that even if characters or pictures are printed on the protective layer 4, it is not difficult to see, and the user can easily see it. Protective layer 4
The base material is not particularly limited as long as it has excellent adhesion between the film substrate 2 and the conductive layer 3. It is made of a synthetic resin such as polyamide, xylene resin, cyclopentadiene resin or the like, which is usually used for a coating material, or a natural resin, and is formed by applying a resin solution. The protective layer 4 may be formed by laminating a polyethylene film or the like, and the thickness is usually about 0.01 to 0.04 mm. Further, a material having low thermal conductivity may be used so as not to release the heat generated in the conductive layer 3.

The heat-invariant color layer 5 is a colored layer that does not change color or deform due to heat generated from the conductive layer 3. This colored layer is formed by a coating layer made of a mixture of a colorant that does not change color at temperatures up to about 100 ° C. and a resin having excellent adhesiveness to the film substrate 2. Examples of such a coloring agent include general pigments or fluorescent pigments used in paints and inks such as phthalocyanine blue, fast yellow, carmine red, and red iron oxide. Examples of the resin include a synthetic resin such as a polyamide, a xylene resin, and a cyclopentadiene resin, which are generally used for a coating material, and a natural resin. The thickness of the heat invariant color layer 5 is usually about 0.05 to 0.3 mm. Further, the heat-invariant color layer 5 does not necessarily need to be composed of a single coloring material, and may use two or more coloring materials of the same color, or two different coloring materials from the center to the both ends in the longitudinal direction. The above coloring materials may be separately applied in a pattern.

The reversible thermochromic layer 6 is composed of a coloring material composition containing a color former, a color developer and a desensitizer. Such a coloring material composition can be discolored (developed or decolored) at any temperature by appropriately selecting the type of desensitizer. For example, if the reversible thermochromic layer 6 is discolored at room temperature, it is inconvenient as a device, so that it is adjusted so that the color changes at 40 ° C. or more. Reversible thermochromic layer 6
Is formed by a coating layer made of a mixture of such a coloring material and a resin having excellent adhesion to the heat-invariant color layer 5 or a printing layer containing a coloring material microencapsulated with a resin. As the resin, for example, vinyl acetate resin,
An acrylic emulsion resin, a copolymer emulsion resin thereof, and a synthetic resin such as polyamide are exemplified. Further, as the thermochromic coloring material, it is not always necessary to use a single material. For example, two or more coloring materials of the same color or different colors having different color changing temperatures may be separately applied. The thickness of the reversible thermochromic layer 6 can vary depending on the wear of the coloring material, but is usually from 0.05 to 0.5.
It is about 5 mm.

As described above, the electromotive force inspection apparatus 1 of the present invention is constituted by laminating the above layers. Hereinafter, the function and effect of the film substrate 2 which is a feature of the present invention will be described. The film substrate 2 has a lower thermal conductivity and a smaller thickness than the conventional substrate. This is a measure for preventing the heat generated in the conductive layer 3 from being dispersed. This will be specifically described below.

In order to inspect the electromotive force of the battery using the electromotive force inspection apparatus 1 of the present invention, the contact portions 8 and 9 need only be brought into contact with the electrodes of the battery and pressed. Further, in the electromotive force inspection apparatus of the present invention, since the protective layer 4 is white, a precautionary statement and a method of use can be printed, and it is easy to see and there is no mistake in the method of use. In this case, a current flows from the positive electrode to the negative electrode of the battery via the conductive layer 3. At this time, the kinetic energy of the electrons lost due to the internal resistance of the conductive layer 3 is released to the outside as heat. This heat discolors the reversible thermochromic layer 6 via the film-like substrate 2 and the thermochromic layer 5.

However, in this process, 100% of the heat generated in the conductive layer 3 is not transmitted to the reversible thermochromic layer 6. In the process of being transferred from the conductive layer 3 to the thermochromic layer 6, the heat spreads in all directions, and the larger the spread range, the greater the heat loss. In addition, the higher the thermal conductivity, the faster the heat is transmitted and spreads over a wider area. Further, neither the thermochromic layer 5 nor the reversible thermochromic layer 6 is formed over the entire surface of the film substrate, but is formed along the conductive layer 3 in a very limited area of the film substrate. . That is, all the heat transmitted beyond this range on the film-shaped substrate 2 is considered to be wastefully consumed heat.

The thermal conductivity of the film-like substrate 2 used in the electromotive force inspection apparatus 1 of the present invention is reduced so that a minimum heat loss is required. Further, the thickness was reduced so that the heat generated in the conductive layer 3 was quickly transmitted to the reversible thermochromic layer. This is a measure for reducing the heat lost in the film-like substrate 102 of the conventional electromotive force inspection apparatus 101.

That is, the conventional film-shaped substrate 102 is made of a material having a high thermal conductivity as shown in FIG. 2A, and is configured to be thicker than the film-shaped substrate 2 of the present invention. Further, the heat invariant color layer 105 is not formed over the entire area of the film-like substrate 102, but is formed only on a very limited portion. On the other hand, in the process in which heat is transferred from the film-like substrate 102 of the prior art to the heat invariant color layer 105, the heat is high, so that the heat is quickly spread over a wide area as shown by the arrow in FIG. Convey. That is, it is most efficient if the heat is transferred to the heat invariant color layer 105 linearly, but in reality it is not. Actually, heat is transmitted beyond the part where heat is most desired to be transmitted. Further, the film-like substrate 102 of the prior art is configured to be thick, and the reversible thermochromic layer 1
While sufficient heat is transferred to the substrate 06, a considerable amount of heat is lost in the film-like substrate 102.

In order to reduce this, in the electromotive force inspection apparatus 1 of the present invention, a material having a low thermal conductivity is used for the film-like substrate 2 and, as shown in FIG. 102 was made thinner. This makes it possible to efficiently transfer heat to the reversible thermochromic layer 6 via the thermochromic layer 5 while suppressing the dispersion of heat inside the film-like substrate 2.

Further, as one embodiment of the present invention, there is a film-like substrate 2 using transparent polyethylene terephthalate. Although it is possible to use polyethylene terephthalate in the first embodiment described above, the structure described below uses transparent polyethylene terephthalate. The aforementioned electromotive force inspection device 1
Since the film-like substrate 2 uses an opaque material such as synthetic paper, it is necessary to check the discoloration of the reversible thermochromic layer 6 at the time of use. The film-like substrate 2 must be sandwiched between the color changing layer 6 and the color changing layer 6.

However, when polyethylene terephthalate is used for the film-like substrate 2, the reversible thermochromic layer 6 is laminated on the film-like substrate 2 as shown in FIG. Thus, a configuration in which the heat invariant color layer 5, the conductive layer 3, and the protective layer 4 are further laminated is also possible. When using the electromotive force inspection device 1 having such a configuration, it is only necessary to bring the contact portions into contact with the respective electrodes of the battery and press them down. Also in the electromotive force inspection apparatus of this embodiment, since the protective layer 4 is white, a precautionary statement and usage can be printed, and it is easy to see and there is no mistake in usage.

As shown in FIG. 1B, a film-like substrate 2 made of transparent polyethylene terephthalate has a conductive layer 3, a protective layer 4, a thermochromic layer 5, and a reversible thermochromic layer 6.
Is laminated on one surface of the film-shaped substrate 2, the film-shaped substrate 2 exhibits another effect different from the above-described structure. That is, the protective layer 4 and the thermochromic layer 5 are closely adhered to the conductive layer 3, and the reversible thermochromic layer 6 is laminated to the thermochromic layer 5. When the electromotive force inspection device 1 as shown in FIG. 1B is used, heat generated in the conductive layer 3 is transmitted to the reversible thermochromic layer 6 through the thermochromic layer 5.
The heat that can be consumed during the transfer process is the protection layer 4 and the heat-invariant color layer 5
Only, there is an effect that the efficiency is higher than that of the configuration of FIG. Further, since the reversible thermochromic layer 6 is laminated with the film-like substrate 2 having a low thermal conductivity in close contact, the heat transmitted to the reversible thermochromic layer 6 stays there without escaping to the outside, and the efficiency is also improved. Is effective.

As described above, the electromotive force inspection apparatus 1 having the above-described two configurations has a color that appears as a composite effect of the thermo-invariant color layer 5 and the reversible thermo-chromic layer 6 before and after heat is generated by the internal resistance of the conductive layer 3. Is clearly changed, so that the electromotive force of the battery can be visually detected.

As one embodiment of the present invention, FIG.
When the portions 6a and 6b separately coated with two kinds of coloring materials are provided on the reversible thermochromic layer 6 as shown in FIG. 6, the color can be changed by the electromotive force of the battery, so that it is visually clear and easy to understand. . In this case, the coloring materials may have different discoloration temperatures or different colors after discoloration. Further, when the reversible thermochromic layer 6 contains a coloring material which becomes colorless by heating, the color itself of the underlying thermochromic layer 5 can be directly recognized at the time of inspection, so that it is easily visually recognizable.

In still another embodiment, as shown in FIG. 3, a deficient portion 9 is provided in the conductive layer 3 to divide the current flow path into a plurality of portions, and the width is narrowed toward the center. Things. According to this, since the range of heat generated in the conductive layer 3 can be widened and the amount of heat can be increased, the heat-invariant color change layer 5 and the reversible thermo-color change layer 6 can be larger than those in the related art. In use, the color change of the reversible color change layer 6 is remarkably observed. If the discoloration is noticeable,
The user can determine the quality of the battery without wasting the battery.

In recent years, electric appliances that have been stationary have been provided in a size and weight that can be carried one after another. For example, portable headphone stereo, home video, CD or MD player, mobile phone, notebook computer, and the like. These products generally use secondary batteries such as nickel-cadmium and lithium-hydrogen. The electromotive force inspection device 1 of the present invention can be used not only for dry batteries, but also for secondary batteries used in the above products and the like.

In each of the above-described embodiments, the configuration using the conductive layer and the reversible thermochromic layer has been exemplified. However, a configuration in which one layer also has these functions can be adopted. That is, the above-mentioned reversible thermochromic layer 6 is composed of a coloring material composition containing a color former, a developer and a desensitizer,
A conductive material such as metal powder is blended with the material to impart conductivity. As a result, a conductive layer having reversible thermochromic properties is formed, and when the conductive layer is energized, the conductive layer itself changes color.

[0042]

As described above, the battery electromotive force inspection apparatus of the present invention uses a material having a low thermal conductivity for the film-like substrate and further reduces the thickness thereof, thereby reducing the heat generated in the conductive layer. Can be efficiently transmitted to the reversible thermochromic layer without escape. This can also reduce battery consumption. Further, the battery electromotive force inspection apparatus of the present invention, by using polyethylene terephthalate for the film substrate, a conductive layer, a protective layer, a heat invariant color layer, and a reversible thermochromic layer on one side of the film substrate. Stacking becomes possible. Thereby, the heat transfer efficiency can be improved. Further, the battery electromotive force inspection device of the present invention,
By mixing the titanium oxide pigment in the protective layer, it becomes white, and the notes and usage are easy to see. This prevents the user from using the wrong usage.

[Brief description of the drawings]

FIG. 1A is a cross-sectional view of a first embodiment of a battery electromotive force inspection apparatus according to the present invention, FIG. 1B is a cross-sectional view of a second embodiment, and FIG. It is a rear view of an inspection device, and shows the correlation of a conductive layer and a protective layer.

FIG. 2 is an explanatory diagram showing how heat is transmitted between a battery electromotive force inspection device of the present invention and a conventional electromotive force inspection device;
(A) shows the prior art, and (b) shows the electromotive force inspection device of the present invention.

FIG. 3 is an explanatory view of a battery electromotive force inspection apparatus according to another embodiment of the present invention, showing a defective portion provided in a conductive layer.

FIG. 4 is a conceptual diagram showing another battery electromotive force inspection apparatus of the present invention, in which two different coloring materials are used for a reversible thermochromic layer.

FIG. 5 is a conceptual cross-sectional view and a rear view of a conventional battery electromotive force inspection apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electromotive force inspection apparatus 2 Film-shaped board 3 Conductive layer 4 Protective layer 5 Thermal invariant color layer 6 Reversible thermochromic layer 7, 8 Contact part 9 Defect part

Claims (6)

[Claims] 1. A thermochromic layer and a conductive layer on a film-like substrate,
Alternatively, a conductive layer having a thermochromic property is laminated, and electricity is supplied to the conductive layer through a contact portion provided on the conductive layer to cause the conductive layer to generate heat, thereby discoloring the thermochromic layer or the conductive layer itself. In the battery electromotive force inspection device, the thermal conductivity of the film-shaped substrate is 0.2 w / m · k or less. 2. A conductive layer is laminated on one surface of a film-like substrate, and a thermochromic layer is laminated on the other surface, and a current is applied to the conductive layer through a contact portion provided on the conductive layer to cause the conductive layer to generate heat. In the battery electromotive force inspection device for discoloring the thermochromic layer to check the quality of the battery, the film-shaped substrate has a thermal conductivity of 0.01 to 0.2 w / mk and a thickness of 0.1 to 0.2 w / mk. 1 to
A battery electromotive force inspection device having a diameter of 0.3 mm. 3. The battery electromotive force inspection device according to claim 1, wherein the film-like substrate is made of polyethylene terephthalate or synthetic paper. 4. The thermochromic layer, which changes color from color to transparent reversibly at a specific temperature or higher, has a thermochromic layer, and is thermochromic when the thermochromic layer changes color to transparent. The battery electromotive force inspection device according to any one of claims 1 to 3, wherein the layer is visible. 5. The method according to claim 1, wherein a protective layer is provided adjacent to the conductive layer, and the protective layer contains a titanium oxide pigment having an average particle diameter of 0.1 μm to 0.5 μm. The battery electromotive force inspection device according to any one of the above. 6. A thermochromic layer and a conductive layer on a film-like substrate;
Alternatively, a conductive layer having thermochromic properties is laminated, a protective layer is further laminated on the conductive layer, electricity is supplied to the conductive layer through a contact portion provided in the conductive layer, and the thermochromic layer or In the battery electromotive force inspection device for discoloring the conductive layer itself and confirming the quality of the battery, the protective layer has an average particle diameter of 0.2.
An electromotive force inspection device for a battery, comprising a titanium oxide pigment of 1 μm to 0.5 μm.