JP5695854B2 - Water battery and manufacturing method thereof - Google Patents

Description

  The present invention relates to a water battery that generates electricity by injecting water, and more particularly, to a relatively thin water battery and a method for manufacturing the same.

  Conventionally, water batteries that generate electricity by injecting water are known. For example, Patent Document 1 discloses a metal negative electrode outer cylinder that forms the outer shape of a water battery, a positive electrode active material made of activated carbon, a rod-shaped positive electrode current collector inserted into the positive electrode active material, and water. A water battery including a water absorbing member for supplying a positive electrode active material to a positive electrode active material is disclosed.

Utility model registration No.3112869

    In the water battery disclosed in Patent Document 1, water injected from the water inlet formed in the bottom surface of the cylindrical negative electrode outer cylinder into the negative electrode outer cylinder penetrates the positive electrode active material through the absorbing member. By generating an electromotive force between both electrodes, a required current can be generated for a certain period of time.

  An object of the present invention is to improve a water battery in the prior art, and to provide a relatively thin water battery capable of generating a predetermined electromotive force by supplying a small amount of moisture and a method for manufacturing the same. is there.

  In order to solve the above problems, the present invention is directed to a vertical direction and a horizontal direction, a positive electrode plate having a positive terminal, a negative electrode plate having a negative terminal, the positive electrode plate, and the negative electrode. It is a water battery containing the positive electrode active material located between plates. In the present invention, the non-woven fabric sheet serving as the base material of the outer sheet is transported in the machine direction via the transport means, and the pair of outer sheets facing each other in the direction orthogonal to the machine direction uses a common cutting line. The water battery manufacturing method includes a cutting step of the outer sheet on which the outer shapes of the first and second holding portions are formed.

  The present invention is characterized in that it further includes an electrically insulating and water-permeable outer sheet, the outer sheet has a bag-shaped first holding part, and the positive electrode plate is inserted into the first holding part. The positive electrode active material fixed to the inner surface of the first holding part is interposed between the negative electrode plate and the positive electrode plate.

  In another embodiment of the present invention, the outer sheet has a bag-like second holding part, and the negative electrode plate is inserted and held in the second holding part.

  In another embodiment of the present invention, the outer sheet has a first surface and a second surface opposite to the first surface, and the positive electrode plate, the negative electrode plate, and the positive electrode active material are respectively in the lateral direction. The positive electrode plate and the positive electrode plate are disposed on the first surface of the outer sheet at a given distance, and by folding the outer sheet along a plurality of folding lines extending in the longitudinal direction of the outer sheet. A part of the envelope sheet in which the positive electrode active material is in contact with and overlaps with each other, and the positive electrode active material and the negative electrode plate form at least the first holding portion of the first and second holding portions. The positive electrode plate, the positive electrode active material, and the negative electrode plate are laminated and are encapsulated in the outer sheet.

  In another embodiment of the present invention, the outer sheet has a base portion that is continuous with the first holding portion, and the length dimension of the first holding portion in the vertical direction is the length of the base portion. A step portion is formed between the side edge of the base portion and the opening end edge of the first holding portion, and the length dimension in the vertical direction of the step portion is the second holding portion. This is substantially the same as the length of the portion in the vertical direction.

  In another embodiment of the present invention, the folding line is formed by a part to which an adhesive is applied or a joint part by heat sealing.

  According to the water battery of the present invention, each constituent material such as the positive electrode plate is encapsulated by the outer sheet so that it is thinner and lighter than the conventional tubular water battery. is there. Further, since the positive electrode plate is inserted and held in the first holding portion, the operation at the time of assembly is easy, and there is no possibility that the positive electrode plate is greatly displaced in the outer sheet during use.

The perspective view of the water battery of the present invention. The top view in the state where the water battery was developed. III-III sectional view taken on the line of FIG. (A), (b), (c) The figure which shows the assembly process of an outer sheet | seat. Schematic which shows a part of manufacturing process of an outer sheet | seat.

  As shown in FIGS. 1 and 2, the water battery 10 includes a longitudinal direction Y and a lateral direction X, an outer packaging sheet 11, a positive electrode plate 12 for collecting charges encapsulated in the outer packaging sheet 11, and a negative electrode plate 13. And a positive electrode active material 14 positioned between the positive electrode plate 12 and the negative electrode plate 13 in the outer sheet 11. As shown in FIG. 3, the positive electrode plate 12, the negative electrode plate 13, and the positive electrode active material 14 are encapsulated in a state of being laminated on the outer sheet 11.

  In addition, the water battery 10 includes first and second side edges 16 and 17 that extend in parallel to each other in the vertical direction Y, and first and second opening end portions 18 and 19 that are positioned to face each other in the vertical direction Y. The positive terminal 12a of the positive electrode plate 12 and the negative terminal 13a of the negative electrode plate 13 protrude from the first opening end 18 outward in the vertical direction Y. Between the positive electrode terminal 12a and the negative electrode terminal 13a, an insulating seal 20 is disposed to prevent conduction between the positive electrode terminal 12a and the negative electrode terminal 13a, and is attached to the positive electrode terminal 12a and / or the negative electrode terminal 13a. The positive electrode terminal 12a and the negative electrode terminal 13a are waterproofed by applying wax or the like, and the first and second open ends are as long as the predetermined moisture required for power generation is absorbed from the outer sheet 11. The parts 18 and 19 may be sealed by an adhesive or a heat seal process. In the present embodiment, in order to reduce the length of the entire water battery 10 in the vertical direction Y, both the positive terminal 12a and the negative terminal 13a extend from the first opening end 18 outward in the vertical direction Y. However, the positive electrode terminal 12a and the negative electrode terminal 13a may extend outward in the vertical direction Y from different open end portions 18 and 19. Moreover, in this embodiment, although the positive electrode terminal 12a and the negative electrode terminal 13a have the shape which protrudes outward of the vertical direction Y, the shape located in the outer sheet | seat 11 may be sufficient as the whole. In addition, the main body of the positive electrode plate 12 and the main body of the negative electrode plate 13 positioned in the outer sheet 11 may have the roles of the positive and negative terminals 12a and 13a, respectively.

  The envelope sheet 11 is made of an electrically insulating and liquid-permeable sheet material, and is formed of, for example, a water-permeable fiber nonwoven fabric or a porous plastic film.

  Further, as shown in FIG. 2, the envelope sheet 11 has a first surface 21A and a second surface 21B, and first and second side edges extending in the lateral direction X so as to be opposed to each other in the longitudinal direction Y in the developed state. 22 and 23, and a flat shape defined by first and second end edges 24 and 25 extending in the longitudinal direction Y so as to be spaced apart from each other in the lateral direction X, and the base 27 and the bag connected to the base 27 And a first holding portion 28 having a shape. The positive electrode plate 12 is inserted and held in the first holding part 28.

  The base 27 includes a bag-shaped second holding part 29 formed by bending a part of the outer sheet 11 and a longitudinal direction Y along the side edge 31 on the first end edge 24 side of the second holding part 29. And a first folding line 30 extending in the direction. The negative electrode plate 13 is inserted and held in the second holding part 29.

The first holding portion 28 has a length dimension in the vertical direction Y smaller than that of the base portion 27, and the first and second joint portions 32 and 33 extending in the vertical direction Y formed by applying heat seal processing or an adhesive. Is defined in a bag shape. Between the base part 27 and the 1st holding | maintenance part 28, the 2nd folding line 34 produced by the rigidity difference of the outer sheet | seat 11 which forms the 2nd junction part 33 and the base part 27 is formed. Further, the side edge 27a of the base portion 27 constituting a part of the first side edge 22 and the stepped portion 35 of the opening end edge 28a of the first holding portion 28 constituting a part of the first side edge 22 similarly. The length dimension l _{1 in} the vertical direction Y and the length dimension l ₂ in the vertical direction Y of the second holding portion 29 are substantially the same. More specifically, in order to securely hold the negative electrode plate 13 to the second holding portion 29, the length _{l 2} in the longitudinal direction Y of the second holding portion 29, it is 0.5~1.0mm Is preferred.

  The width 27 in the lateral direction X of the base portion 27 of the outer sheet 11 is substantially equally divided into two by the first edge 24 and the first and second folding lines 30 and 34. Specifically, the first section 36 defined between the first edge 24 and the first folding line 30 and the first section 36 defined between the first folding line 30 and the second folding line 34. It is divided into two zones 37. An adhesive region 39 extending in the longitudinal direction Y is formed on the first edge 24 side of the first section 36 of the outer sheet 11. Adhesive is intermittently applied to the adhesive region 39 so as to absorb moisture from the second surface 21B of the outer sheet 11 and act as an oxidation reaction catalyst for the positive electrode active material 14 disposed therein. It is preferable. In addition, as long as it does not inhibit the water | moisture content osmose | permeating the inside of the water battery 10, the adhesion area | region 39 may be joined not by an adhesive agent but by heat seal processing.

  The positive electrode plate 12 is a convex thin plate that is inserted and held in the first holding portion 28 of the outer sheet 11 and has a relatively high conductivity and a low ionization tendency, and is electrochemically stable. For example, it is made of a metal such as nickel, copper, silver or an alloy mainly composed of these metals.

  The negative electrode plate 13 is a thin plate having the same shape and the same size as the positive electrode plate 12 inserted and held in the second holding portion 29 of the first section 37 of the outer sheet 11 and has a tendency to compare ionization and / or oxidation. A large electrode active material, for example, metallic magnesium, aluminum, zinc or the like, or an alloy containing at least two of them is made.

  The positive electrode active material 14 is a powder that is fixed to the inner surface of the first holding portion 28 of the outer sheet 11 via an adhesive applied in a spray form, and has a relatively strong oxidizing power, for example, It is made from a mixture of activated carbon, manganese dioxide, iron oxide, crystalline silver oxide and the like, and the type and mixing ratio of the mixture can be freely set according to the required oxidizing power. In addition, in order to form a relatively thin water battery 10 as a whole, a plurality of types of materials used for activated carbon or processed ones may be used to enable generation of required electromotive force in a small amount. It can also be used. In the present invention, the positive electrode active material 14 is in a powder form, but various powders such as activated carbon may be formed into a sheet shape and fixed to the inner surface of the first holding portion 28 with an adhesive. In addition, it is preferable to apply | coat intermittently the adhesive agent which fixes the positive electrode active material 14 in order to permeate | transmit a water | moisture content.

  In order to change the water battery 10 from the unfolded state shown in FIG. 2 to the assembled state of FIG. 1, first, the first holding portion 28 of the outer sheet 11 is folded inward along the second folding line 34, and the first The holding part 28 and the second area 37 are opposed to each other, and the negative electrode plate 13 and the second holding part 29 located in the second area 37 and the first holding part 28 are overlapped with each other. Next, the first section 36 is folded back along the first folding line 30 toward the second surface 21B of the first holding portion 28 folded into the second section 37, and they are brought into contact with each other and overlapped. In such a state, the first surface 21A of the first section 36 is fixed to the second surface 21B of the first holding portion 28 via the adhesive region 39 applied to the first surface 21A of the first section 36, thereby The battery 10 can be assembled.

  As shown in FIG. 3, the positive electrode plate 12 and the positive electrode active material 14 are in contact with each other inside the water battery 10, and the positive electrode active material 14 forms a first holding portion 28 to which the positive electrode active material 14 is fixed. The negative electrode plate 13 is in contact with the outer packaging sheet 11. In the water battery 10 having such an aspect, when the moisture permeates into the inside from the second surface 21B and / or the first and second opening end portions 18 and 19 of the outer sheet 11, the outer shape that forms the first holding portion 28 is formed. Moisture is diffused into the positive electrode active material 14 through a part of the sheet 11, and the diffused moisture acts as an oxidation reaction catalyst to cause an ionization reaction between the electrode plates 12 and 13, thereby generating an electromotive force. .

  Since the water battery 10 according to the present invention is encapsulated in a state in which each constituent material is laminated by the outer sheet 11, it is thinner and lighter than a conventional cylindrical water battery. Further, even when only a small amount of moisture is supplied to the water battery, moisture can be supplied to the positive electrode active material and diffused through the outer sheet 11 interposed between the constituent materials, and the required electromotive force can be diffused. Can be generated promptly.

  Further, since the positive electrode plate 12 and the negative electrode plate 13 are inserted and held in the first and second holding portions 28 and 29, respectively, there is no possibility that they are largely displaced in the outer sheet 11. Furthermore, in the 1st holding | maintenance part 28 folded inward when the water battery 10 is assembled, only the part including the positive electrode plate 12 including the positive electrode terminal 12a is exposed from the 1st holding | maintenance part 28, and most of them. Since the part is inserted and held in the first holding unit 28, the assembly operator does not need to press the positive electrode plate 12 with a finger when bending the first holding unit 28. It can be freely operated by picking with a finger, and the assembly work becomes relatively easy.

  Although not shown, a lead wire may be attached to the positive electrode terminal 12a and the negative electrode terminal 13a by soldering, spot welding, or the like. Further, by using a relatively thin lead wire, the lead wire is fixed together with the outer sheet 11 when the first opening end 18 and / or the second opening end 19 is sealed by heat sealing. Can do. In addition, when the constituent members of the outer sheet 11 cannot be held sufficiently with the sandwiching force, the exterior made of a porous plastic film and a hard plastic material having a plurality of openings The outer sheet 11 may be encapsulated by a member.

  4A to 4C are diagrams illustrating an assembly process of the outer sheet 11, and FIG. 5 is a schematic diagram illustrating a part of the manufacturing process of the outer sheet 11. In FIG. 5, the machine direction is indicated by MD, and the direction orthogonal to the machine direction MD is indicated by CD. Further, in FIG. 5, the cutting line 52 is indicated by a two-dot chain line for convenience of explanation.

  As shown in FIG. 4A, the outer sheet 11 before assembly includes a stepped first side edge 22 having a stepped portion 40a, a second side edge 41 having stepped portions 41a and 41b, and a first side edge. 22 and the second side edge 41 are connected to each other to form a flat shape defined by first and second end edges 24 and 44 extending in parallel with each other. Further, the outer sheet 11 is connected to the portion of the second side edge 41 intersecting the first edge 24 and extends straight toward the second edge 44, and folds the second edge 44 into two equal parts. 45 and first and second portions 46 and 47 divided by a folding line 45.

  In the envelope sheet 11 having such an aspect, as shown in FIG. 4B, the second portion 47 is bent toward the first portion 46 along the folding line 45, and they are overlapped with each other. Next, as shown in FIG. 4C, in a state where the first portion 46 and the second portion 47 are folded, the step portions 41a and 41b of the second portion 47 and the first portion 46 facing the same are overlapped. The second end edges 44 are joined to each other at first to third joint portions 30, 32, and 33 each made of an adhesive or heat sealing. The 1st site | part 46 and the 2nd site | part 47 are joined by the 1st-3rd junction parts 30,32,33, and the 1st and 2nd holding | maintenance parts 28 and 29 are formed.

  As described above, the outer sheet 11 is formed from one sheet, and the first and second holding portions 28 and 29 are formed by bending the folding line 45, so the first and second holding portions 28 are formed. 29, the folding line 45 is located, and there is no possibility that the positive electrode active material 14 will drop off from the bottom. Moreover, since the 1st-3rd junction parts 30, 32, and 33 are extended in the same direction, when heat-sealing, they can be sealed by one press process.

  As shown in FIG. 5, in the manufacturing process of the outer sheet 11, the fiber nonwoven fabric sheet 49 serving as the base material of the outer sheet 11 is supplied onto the conveying belt 51 via the supply roll 50 and is conveyed in the machine direction MD to be cut. The outer sheet 11 is formed by being cut by the cutting means 53 along the line 52. The cutting line 52 has such a shape that the outer sheet 11 can be continuously formed in the machine direction MD and the orthogonal direction CD, and specifically, the second of the pair of outer sheets 11 facing each other in the orthogonal direction CD. The side edge 41 is formed by cutting along the common cutting part 52a.

  The fiber nonwoven fabric sheet 49 is cut by a cutting line having such a shape, so that the fiber nonwoven fabric sheet 49 is cut by a cutting line in which the outer sheet 11 is continuous only in the machine direction MD. The trims 54 and 55 resulting from 49 can be minimized, and the waste of the base material can be eliminated.

  The water battery 10 according to the present invention can be used in various fields as long as the function is exhibited. For example, the water battery 10 is disposed in a disposable diaper together with a micro device having a sensor function and discharged. The water cell 10 generates power by operating the sensor sheet function by the permeated urine permeating into the outer sheet 11, or the water cell 10 is disposed in a limited space where the humidity changes, and the space becomes a predetermined humidity or higher. When it reaches, the generated water is absorbed and the water battery 10 can generate electric power to activate the sensor function. Furthermore, in medical sites, the water battery 10 is placed on the inner surface or outer surface of a medical fixing tape or adhesive bandage in order to detect early leakage of infusion liquid at the time of instillation or blood leakage from the guiding tube at the time of voting. It can be used as a tool for preventing medical accidents by arranging them, generating electric power using the flowing liquid as a catalyst, and transmitting a signal by an accompanying sensor device.

  In addition, as each member which comprises the water battery 10, the material used for this kind of goods other than the said material can be used without a restriction | limiting. Moreover, although not shown in figure, the electromotive force of several times-several hundred times can also be produced rather than the electromotive force by one water battery 10 by laminating | stacking the water battery 10 which concerns on this invention in parallel. .

DESCRIPTION OF SYMBOLS 10 Water battery 11 Outer sheet | seat 12 Positive electrode plate 12a Positive electrode terminal 13 Negative electrode plate 13a Negative electrode terminal 14 Positive electrode active material 21A First surface 21B of outer sheet 27 Second surface 27 of outer sheet 27 Base 28 First holding part 29 Second holding part 30 First folding line 34 Second folding line 35 Step part 50 Non-woven fabric sheet 52 Cutting line 53 Cutting means l Length dimension of the _first step part l ₂ Length dimension of the second holding part length direction X Horizontal direction Y Longitudinal direction

Claims (6)

In a water battery comprising a vertical direction and a horizontal direction, a positive electrode plate having a positive electrode terminal, a negative electrode plate having a negative electrode terminal, and a positive electrode active material located between the positive electrode plate and the negative electrode plate,
Further comprising an electrically insulating and water permeable outer sheet,
The outer sheet has a bag-shaped first holding portion, and the positive electrode plate is inserted and held in the first holding portion;
The water battery, wherein the positive electrode active material fixed to the inner surface of the first holding part is interposed between the negative electrode plate and the positive electrode plate.   The water battery according to claim 1, wherein the outer sheet has a bag-like second holding portion, and the negative electrode plate is inserted and held in the second holding portion. The outer sheet has a first surface and a second surface opposite to the first surface, and the positive electrode plate, the negative electrode plate, and the positive electrode active material are spaced apart from each other by a given dimension in the lateral direction. The positive electrode plate and the positive electrode active material are in contact with each other and overlap each other by bending the outer sheet along a plurality of folding lines extending in the longitudinal direction of the outer sheet. The positive electrode active material and the negative electrode plate are overlapped via a part of an outer sheet that forms at least the first holding portion of the first and second holding portions, and the positive electrode plate The water battery according to claim 2 , wherein the positive electrode active material and the negative electrode plate are encapsulated in the outer sheet in a stacked state. The outer sheet has a base part continuous with the first holding part, and the length dimension of the first holding part in the vertical direction is smaller than the length dimension of the base part in the vertical direction, and the side edge of the base part And a stepped portion is formed between the opening end edge of the first holding portion, and the lengthwise dimension of the stepped portion is substantially the same as the lengthwise length of the second holding portion. The water battery according to claim 2 or 3 . The water battery according to claim 3, wherein the folding line is formed by a part to which an adhesive is applied or a joint part by heat sealing. In the water battery according to any one of claims 2 to 5, a pair of fiber non-woven sheets serving as a base material of the outer sheet is conveyed in a machine direction via a conveying means, and is opposed in a direction orthogonal to the machine direction. The method for manufacturing the water battery, including a cutting step of the outer sheet, wherein the outer sheet is formed with an outer shape of the first and second holding portions by a common cutting line.

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