JP2005189117A - Water wettability determination sheet and battery pack - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water wettability determination sheet easily controllable when applying a water-soluble ink, dispensing with a printing plate for applying the water-soluble ink so as to form a pattern, capable of suppressing increase of components for displaying information, and suppressing generation of oozing of the water-soluble ink caused by moisture in an adhesive, and a battery pack equipped with the water wettability determination sheet. <P>SOLUTION: In this water wettability determination sheet 4, oozing of the water-soluble ink 6 appears on the other surface 40b of the sheet 40, when the sheet 40 is wetted by water. The water-soluble ink 6 is applied on the whole surface of one surface 40a of the sheet 40. A character or a pattern is entered on the other surface 40b by a waterproof ink. An adhesive 41 is applied to the other surface 40b. In this battery pack, the water wettability determination sheet 4 is arranged so that the other surface 40b is faced to a window inside a case, and that one surface 40a is faced to the window outside the case. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a water wetness determination sheet for determining whether or not the water has been submerged, and a battery pack including the water wetness determination sheet.

  Mobile devices such as mobile phones and personal digital assistants (hereinafter referred to as PDAs) may be submerged inadvertently by the user, and this submersion causes water to enter inside the battery pack used as the power source of the mobile device. May penetrate. The battery pack includes a secondary battery, a terminal for connecting to a contact of a portable device, and a case that covers the secondary battery while exposing the terminal, and is used in a state where water has entered the case. In such a case, a short circuit may occur due to water that has entered the inside, leading to failure or performance degradation.

  In this way, the battery pack that has caused breakdown or performance degradation due to submergence is unlikely to leave traces of submersion when it is completely dried. Is often very difficult to investigate. For this reason, in order to make it easy to specify that water has entered the inside of the battery pack by submerging the portable device, there is a battery pack provided with a water wetness determination sheet (see, for example, Patent Document 1).

  For example, the water wetness determination sheet is obtained by applying water-soluble ink so as to form a polka dot pattern on one side of a sheet that can permeate water, and the sheet is provided on a window provided in the case inside the case of the battery pack. Are arranged so that one side faces each other. Some water wetness determination sheets have a substantially transparent waterproof sheet made of polyester attached to one side of the sheet.

By providing such a water wetness determination sheet, when water intrudes into the case, the infiltrated water adheres to the sheet and soaks water-soluble ink, so a polka dot pattern applied to one side of the sheet Becomes blurred and blurry. If the battery pack with water in the case is completely dried, the sheet will dry with the polka dot pattern smeared and blurred. By visually recognizing, it can be determined whether water has entered the inside of the battery pack.
Japanese Patent Laid-Open No. 11-144695

  However, since the water wetness determination sheet described above determines whether or not the water is wet depending on whether or not the polka dot pattern applied on one side of the sheet has bleeding, in the state before the water wets, There must be no blur and clear. For this reason, there has been a problem that management for preventing bleeding from occurring when applying water-soluble ink to one surface of the sheet is complicated, or that moisture during storage needs to be sufficiently suppressed.

  In addition, in order to apply water-soluble ink to one side of the sheet so as to form a polka dot pattern, a printing plate engraved with a polka dot pattern is necessary, which raises the problem of increasing the cost of the water wetness determination sheet.

  In addition, when displaying information such as characters and patterns on the outside of the battery pack, even if information such as characters and patterns is entered on one side of the sheet so that it can be viewed from the window of the case, the surface of the sheet is water-soluble. Since the polka dot pattern is made of the characteristic ink, it is difficult to confirm information such as characters and patterns. For this reason, when displaying information such as characters and patterns on the outside of the battery pack, a label on which the characters and patterns are written must be attached to the outside of the case, which increases the number of parts. It was.

  Furthermore, since the adhesive for adhering the waterproof sheet to the sheet or for adhering the water wetness determination sheet to the window of the battery pack case is applied to one surface of the sheet, the moisture in the air absorbed by the adhesive As a result, the polka dot pattern of the water-soluble ink gradually bleeds, and there is a problem that it may be determined that the sheet is wet even though the sheet is not wet. Conventionally, in order to avoid this problem, the adhesive 43 is not applied in a range that can be seen from the outside of the battery pack (see FIG. 6). It is a problem to push up.

  The present invention has been made in view of such circumstances, and is capable of permeating water, and includes a sheet coated with water-soluble ink on one side, and the other side of the sheet can be used as a water wetting determination surface. With this configuration, an object is to provide a water wetness determination sheet that can be easily managed when water-soluble ink is applied.

  It is another object of the present invention to provide a water wetness determination sheet that can reduce costs by applying water-soluble ink so that a printing plate is not required.

  Another object of the present invention is to provide a water wetness determination sheet that can suppress an increase in the number of parts by making it possible to clearly display information such as characters and patterns on the other side of the sheet. .

  Further, the present invention suppresses occurrence of bleeding of water-soluble ink due to moisture in the air absorbed by the adhesive by making the sheet surface to which the adhesive is applied different from the sheet surface to which the water-soluble ink is applied. An object of the present invention is to provide a water wetness determination sheet capable of accurately determining wetness. In the present invention, since the sheet surface to which the water-soluble ink is applied and the sheet surface to which the adhesive is applied are not the same, it is not necessary to partially apply the adhesive, and the adhesive is applied to the entire surface of the sheet. Thus, an object of the present invention is to provide a water wetness determination sheet that simplifies the manufacturing process and reduces the cost.

  Furthermore, the present invention has an object of providing a battery pack that can determine that water has entered the case by providing the water wetness determination sheet described above, and can reduce costs by improving productivity. To do.

  The water-wetting determination sheet according to the first aspect of the present invention is a water-wetting determination sheet in which water-soluble ink is applied to one surface of a water-permeable sheet, and the water-soluble ink bleeds when the sheet is wet. It is made to appear on the other surface of the sheet.

  In the first aspect of the invention, when water adheres to the sheet, the water penetrates the sheet while bleeding the water-soluble ink applied on one surface, and forms water-soluble ink bleeding on the other surface of the sheet. On the other side of the sheet, since water-soluble ink appears when wet, it can be used as a determination surface for determining whether the water is wet.

  The water wetness determination sheet according to the second invention is characterized in that, in the first invention, characters or patterns are written on the other surface of the sheet with water-resistant ink.

  In the second invention, characters or patterns are written on the other side of the sheet with water-resistant ink. Even when water permeates the sheet, the water-resistant ink does not bleed and the characters or patterns written on the other side of the sheet can be maintained.

  The water wetness determination sheet according to the third invention is characterized in that, in the first invention or the second invention, an adhesive is applied to the other surface of the sheet.

  In the third invention, for example, an adhesive is applied to the other surface of the sheet in order to stick the wetness determination sheet itself to the case of the battery pack, or in order to stick a waterproof sheet to the sheet.

  A battery pack according to a fourth aspect of the present invention is directed to a battery pack in which a window is provided in a case that covers the outside of a secondary battery, and a water wetness determination sheet is provided inside the case so as to face the window. The wetness determination sheet is a water wetness determination sheet described in any one of the first to third inventions, wherein the other surface of the sheet is opposed to the window.

  In the fourth invention, the water wetness determination sheet described in any one of the first invention to the third invention is arranged so that the other surface of the sheet faces a window provided in the case. The water that has entered the case penetrates the sheet and soaks the water-soluble ink, and the water-soluble ink appears on the other surface of the sheet.

  A battery pack according to a fifth aspect of the invention is a battery pack in which a window is provided in a case that covers the outside of the secondary battery, and a water wetness determination sheet is provided so as to face the window. The water wetness determination sheet according to any one of the first to third aspects, wherein the one surface of the sheet is opposed to the window outside the case, and is substantially transparent to the other surface of the sheet. A waterproof sheet is pasted.

  In the fifth invention, the water that has entered the inside of the case adheres to one surface of the sheet through the window, permeates the sheet and soaks the water-soluble ink, and the water-soluble ink is smeared on the other surface of the sheet. appear. In addition, water wetting from the other surface side of the sheet is prevented by the waterproof sheet.

  In the water wetting determination sheet according to the first aspect of the invention, water-soluble ink is applied to one surface of a sheet that can penetrate water, and bleeding of the water-soluble ink appears on the other surface of the sheet when the sheet gets wet with water. By doing so, the other surface of the sheet was used as a water wetting determination surface. Therefore, since the surface of the sheet coated with water-soluble ink is not a judgment surface, the presence or absence of bleeding of the water-soluble ink before wetting on the surface of the sheet does not matter, and management is performed when water-soluble ink is applied. It can be simplified.

  Further, in the water wetness determination sheet according to the second invention, since the character or pattern is written with water-resistant ink on the other surface of the sheet, the character or pattern should be maintained without bleeding even when the sheet gets wet. Can do. Therefore, for example, when it is necessary to write characters, patterns, etc. on the outside of the battery pack, a label with characters, patterns, etc. made unnecessary by filling in the other side of the sheet with water-resistant ink. Therefore, the increase in the number of parts can be suppressed.

  Further, in the water wetness determination sheet according to the third invention, since the adhesive is applied to the other surface of the sheet, the water-soluble ink does not gradually bleed due to moisture in the air absorbed by the adhesive. Judgment can be made accurately.

  Furthermore, in the battery pack according to the fourth or fifth invention, since the water wetness determination sheet according to any one of the first to third inventions is provided, it can be determined that water has entered the case. While being able to reduce costs.

  Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments thereof. FIG. 1 is an exploded perspective view of a battery pack according to the present invention including a water wetness determination sheet according to the present invention.

  In the figure, reference numeral 1 denotes a secondary battery having a rectangular plate shape. Terminals 2, 2, and 2 are provided on one end side in the longitudinal direction of the secondary battery 1, and the secondary battery 1 and the terminals 2, 2, and 2 are provided. 2 is covered with a synthetic resin case 3 having a rectangular parallelepiped shape. The case 3 is composed of two case halves 30 and 31 having a dish shape, and is welded so that the peripheral surfaces 34 and 34 of the case halves 30 and 31 face each other. The case half 30 has holes 32, 32 formed corresponding to the positions of the terminals 2, 2, 2 on one end side in the longitudinal direction in order to expose the terminals 2, 2, 2 to the outside of the case 3. , 32 and a window 33 formed in the vicinity of the holes 32, 32, 32. In addition, a water wetness determination sheet 4 to which a waterproof sheet 5 is attached is adhered to the inner surface of the case half 30 so as to close the window 33.

  FIG. 2 is an exploded perspective view of the water wetness determination sheet 4 to which the waterproof sheet 5 is attached.

  The water-wetting determination sheet 4 is formed by applying the water-soluble ink 6 so as to form a polka dot pattern on one surface 40a of the rectangular sheet 40 that can penetrate water, and when the sheet 40 gets wet with water, the water-soluble ink 6 This appears on the other surface 40b of the sheet 40. For the sheet 40, for example, high-quality paper having a thickness of 0.05 mm to 0.2 mm is used.

  On the other surface 40b side of the water wetness determination sheet 4, a waterproof sheet 5 is provided. The waterproof sheet 5 is a synthetic resin substantially transparent sheet formed in substantially the same size and shape as the water wetness determination sheet 4 and prevents the water wetness determination sheet 4 from getting wet from the other surface 40b side. To do. A substantially transparent adhesive 41 applied between the waterproof sheet 5 and the water wetness determination sheet 4 so as to have a thickness of 0.05 mm to 0.06 mm on the entire other surface 40 b of the water wetness determination sheet 4. The substantially transparent adhesive 50 for bonding the waterproof sheet 5 and the water wetness determination sheet 4 to the inner surface of the case half 30 is provided on the surface of the waterproof sheet 5 opposite to the water wetness determination sheet 4 side. It has been applied.

  The water wetness determination sheet 4 and the waterproof sheet 5 were processed so as to form a sheet on the upper side of the water wetness determination sheet 4 disposed with the one surface 40a on which the water-soluble ink 6 was applied with a polka dot pattern as the lower side. The adhesive 41 is placed, the waterproof sheet 5 is placed on the upper side of the adhesive 41, and the adhesive 50 processed into a sheet shape by cutting away the portion corresponding to the window 33 is placed on the upper side of the waterproof sheet 5. By pressing from the side, the water wetness determination sheet 4, the adhesive 41, the waterproof sheet 5 and the adhesive 50 are bonded and integrated.

  With the above configuration, the battery pack according to the present invention is submerged. For example, when water enters the inside of the case 3 from the holes 32, 32, 32, the water that has entered the case 3 is wet. 4 adheres. The water adhering to the water wetness determination sheet 4 penetrates into the water wetness determination sheet 4 while bleeding the water soluble ink 6, and bleeding of the water soluble ink 6 appears on the other surface 40 b of the water wetness determination sheet 4.

  In the water wetness determination sheet 4 according to the present invention, the water-soluble ink 6 is applied to one surface 40a of the sheet 40 so as to form a polka dot pattern, and when the sheet 40 gets wet with water, bleeding of the water-soluble ink 6 occurs. By making it appear on the other surface 40b, the other surface 40b of the water wetness determination sheet 4 was made a water wetness determination surface. Accordingly, since the presence or absence of bleeding before wetting with water does not matter with respect to the polka dot pattern with the water-soluble ink 6 applied to the one surface 40a of the water-wetting determination sheet 4, the management when applying the water-soluble ink 6 is simplified. can do.

  Further, since the surface on which the polka dot pattern is applied with the water-soluble ink 6 is different from the surface on which the adhesive 41 for applying the waterproof sheet 5 is applied, the water-soluble ink is absorbed by the moisture in the air absorbed by the adhesive 41. 6 does not gradually bleed, and it can be determined that the water wetness determination sheet 4 is determined to be wet even though the water wetness determination sheet 4 is not wetted with water. Furthermore, since it is not necessary to limit the application part of the adhesive 41 as in the conventional product and the adhesive 41 can be applied to the entire other surface 40b of the sheet 40, productivity can be improved by simplifying the application work. Can be improved.

  As described above, the water wetting determination sheet 4 or the battery pack according to the present invention has been described based on the configuration shown in the embodiment. However, the water wetting determination sheet 4 or the battery pack according to the present invention is the same as the embodiment described above. The present invention is not limited to the illustrated configuration, and may be configured as another embodiment in which a part of the configuration is deleted, changed, or added without departing from the spirit of the present invention.

  For example, in the embodiment described above, the water wetness determination sheet 4 is integrated with the adhesive 41, the waterproof sheet 5 and the adhesive 50, but the water wetness determination sheet 4, the adhesive 41, the waterproof sheet 5 and the adhesive 50 are integrated. Need not be integrated, and the water wetness determination sheet 4 alone may be used. Further, the water wetness determination sheet 4 is configured to be integrated with the waterproof sheet 5 and the adhesive 41 except for the adhesive 50, or the adhesive 50 on the other surface 40b of the sheet 40 except for the adhesive 41 and the waterproof sheet 5. Further, as shown in FIG. 3, the two water wetness determination sheets 4 and 4 are bonded with an adhesive 42 so that the one surfaces 40a and 40a face each other, and the water wetness determination is performed. You may comprise so that determination of water wetting can be performed from both sides of the sheets 4 and 4.

  Further, the water-soluble ink 6 is applied so as to form a polka dot pattern on the one surface 40a of the sheet 40, but the application of the water-soluble ink 6 is not limited to the polka dot pattern and may be other patterns. Further, the water-soluble ink 6 may be applied to the entire surface 40a of the sheet 40. When the water-soluble ink 6 is applied to the entire surface 40a of the sheet 40, the water-soluble ink 6 is applied so as to form a pattern. A printing plate for application becomes unnecessary, and the cost of the water wetness determination sheet 4 can be suppressed.

  Moreover, although the thickness of the sheet 40 is 0.05 mm to 0.2 mm, the thickness of the sheet 40 is not limited to 0.05 mm to 0.2 mm. Further, although the sheet 40 is a high-quality paper, the sheet 40 is not limited to a high-quality paper, but may be other types of paper, and is not limited to paper but may be a cloth. That is, the sheet 40 may be any sheet that can permeate water.

  In addition, the adhesive 41 is applied to the entire other surface 40b of the water wetness determination sheet 4 so that the thickness is 0.05 mm to 0.06 mm. The thickness of the adhesive 41 is 0.05 mm. It is not limited to .about.0.06 mm. Moreover, the range which apply | coats the adhesive agent 41 is not restricted to the whole surface of the other surface 40b of the water wetness determination sheet | seat 4, Partial may be sufficient, and it is good also as several partially. Note that when the adhesive 41 is applied to the entire other surface 40b of the water wetness determination sheet 4, the adhesive 41 can be applied in one step. The process can be simplified and the cost can be reduced as compared with the case where the adhesive 41 is applied to a plurality of locations.

  Furthermore, the window 33 formed in the case half 30 may have a configuration in which a transparent synthetic resin plate is fitted, for example. That is, the window 33 may be opened or closed as long as the water wetness determination sheet 4 provided inside the case 3 can be viewed from the outside of the case 3. When a transparent synthetic resin plate is fitted to the window 33, the water wetness determination sheet 4 does not need to be adhered to the inner surface of the case half 30. 1 may be adhered to the outer surface.

  FIG. 4 is an exploded perspective view showing another embodiment of the water wetness determination sheet 4 according to the present invention. As shown in the drawing, characters or patterns may be written with the water-resistant ink 7 on the other surface 40 b of the water wetness determination sheet 4. For example, by entering the manufacturing lot number of the battery pack, it is not necessary to use a label for displaying the manufacturing lot number, and an increase in the number of parts can be suppressed. Since the production lot number is written on the other surface 40b of the water wetness determination sheet 4 with the water-resistant ink 7, the display can be maintained without bleeding even when the water wetness determination sheet 4 gets wet. Since other configurations and operations are the same as those in the embodiment shown in FIG. 2, the same reference numerals are assigned to corresponding components, and descriptions of the configurations and operations are omitted.

  FIG. 5 is a perspective view showing another embodiment of the battery pack according to the present invention. As shown in the figure, the water wetness determination sheet 4 is placed on the outer surface of the case 3 so as to close the window 33 provided in the case 3 and so that one surface 40 a of the water wetness determination sheet 4 faces the window 33. It may be glued. By adhering the water wetness determination sheet 4 to the outer surface of the case 3, the portion of the water wetness determination sheet 4 that can be seen from the outside of the case 3 is increased, and the range in which characters or patterns can be written with the water-resistant ink 7 is also increased. . Since other configurations and operations are the same as those in the embodiment shown in FIG. 1, the same reference numerals are assigned to corresponding components, and descriptions of the configurations and operations are omitted.

1 is an exploded perspective view of a battery pack according to the present invention including a water wetness determination sheet according to the present invention. It is a disassembled perspective view of the water wetness determination sheet | seat with which the waterproof sheet was stuck. It is the disassembled perspective view which showed other embodiment of the water wetness determination sheet | seat based on this invention. It is the disassembled perspective view which showed other embodiment of the water wetness determination sheet | seat based on this invention. It is the perspective view which showed other embodiment of the battery pack which concerns on this invention. It is the disassembled perspective view which showed the conventional water wetness determination sheet | seat.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Secondary battery 3 Case 4 Water wetness determination sheet 5 Waterproof sheet 6 Water-soluble ink 7 Water-resistant ink 33 Window 40 Sheet 40a One side 40b Other side 41 Adhesive

Claims (5)

In a water wetness determination sheet in which water-soluble ink is applied to one side of a sheet that can penetrate water,
A water wetness determination sheet, wherein the water-soluble ink bleeding appears on the other surface of the sheet when the sheet is wetted with water.   The water wetness determination sheet according to claim 1, wherein characters or patterns are written on the other surface of the sheet with water-resistant ink.   The water wetness determination sheet according to claim 1 or 2, wherein an adhesive is applied to the other surface of the sheet. In the battery pack in which a window is provided in a case that covers the outside of the secondary battery, and a water wetness determination sheet is provided so as to face the window inside the case.
The water wetness determination sheet is the water wetness determination sheet according to any one of claims 1 to 3,
A battery pack, wherein the other surface of the sheet is opposed to the window. In a battery pack in which a window is provided in a case covering the outside of the secondary battery, and a water wetness determination sheet is provided so as to face the window,
The water wetness determination sheet is the water wetness determination sheet according to any one of claims 1 to 3,
The one side of the sheet is opposed to the window on the outside of the case;
A battery pack, wherein a substantially transparent waterproof sheet is adhered to the other surface of the sheet.

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