JP2017168238A - battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery that can suppress conduction between an outer can and a sealed can via body liquid when the battery enters a body.SOLUTION: A flat circular battery (10) comprises an outer can (1), a sealing can (2), a gasket (3), and an insulator (5). The outer can (1) includes a tubular outer wall portion (12) and a bottom portion (11) for blocking one end of the outer wall portion (12). The outer can (1) has the polarity of one of a positive electrode and a negative electrode. The sealing can (2) includes a top portion (21) facing the bottom portion (11) and a tubular inner wall portion (22). The inner wall portion (22) is disposed inside the outer wall portion (12) in the radial direction of the battery (10). The sealing can (2) has the polarity of the other electrode of the positive electrode and the negative electrode. The gasket (3) is arranged between the outer wall portion (12) and the inner wall portion (22). The insulator (5) covers the entire portion of the outer surface of the sealing can (2) which is exposed from the outer can (1) and the gasket (3), and/or the whole outer surface of the sealing can (2).SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to a battery, and more particularly to a battery having a flat circular shape.

  Conventionally, a flat circular battery having a diameter larger than a thickness is known. A flat circular battery is referred to as a coin-type battery or a button-type battery, for example. These batteries generally have a configuration in which a power generation element is housed inside an outer can and a sealed can. Each of the outer can and the sealed can is electrically connected to the power generation element and has a positive or negative polarity.

  In recent years, accidental ingestion by infants has been regarded as a problem with flat circular batteries. Even if the people around the infant are very careful, it can happen that the infant will put the battery in his mouth. When the infant swallows the battery, the battery may come into contact with the digestive tract, and the outer can and the sealed can may be conducted through the body fluid. That is, a liquid junction is generated between the outer can and the sealed can in the digestive tract. In this case, as described in Non-Patent Documents 1 and 2, an alkaline liquid is generated outside the battery by electrolysis of body fluid. Alkaline liquids can damage the digestive tract.

  Patent Document 1 proposes a button-type battery for preventing accidental ingestion. A conductive film containing a bitter substance is formed on the surface of the battery. Patent Document 1 describes that, as a result of an accidental ingestion test performed by an adult male volunteer, the patient did not accidentally ingest it with a strong bitter taste within 10 seconds.

  Patent Document 2 proposes a technique for fixing a battery cap made of an insulator to a battery in order to prevent leakage from the battery. In Patent Document 2, in a thin battery, since the upper surface of the cathode can (sealing can) and the upper edge of the anode can (exterior can) are almost at the same height, a short circuit occurs when the battery is placed on a metal plate or the like. There is a description that short circuit is prevented by covering the battery cap.

JP-A-4-317622 Japanese Utility Model Publication No. 54-35324

"Beware of accidental ingestion of button batteries by infants (especially under 1 year old!-60% of parents do not know that they are getting worse!-"), [Online], June 18, 2014, independent administration Corporation National Life Center, [March 1, 2016 search], Internet <URL: http://www.kokusen.go.jp/pdf/n-20140618_1.pdf> "Caution on products using button batteries-Risk of chemical burns due to accidental ingestion by infants", [online], October 30, 2014, National Living Center, [March 1, 2016] Day search], Internet <URL: http://www.kokusen.go.jp/pdf/n-20141030_1.pdf>

  In patent document 1, the accidental ingestion of a battery is aimed at by bitterness. However, since there is a difference in taste between individuals, no matter how strong bitterness is imparted to the battery, there is a possibility that the battery will be swallowed. In Patent Document 1, a film containing a bitter substance is formed on the surface of the battery, but the film has conductivity. For this reason, when an infant or the like accidentally swallows the battery and the battery comes into contact with the digestive tract, the outer can and the sealed can easily conduct through the body fluid. Therefore, an alkaline liquid is generated by electrolysis of the body fluid.

  In Patent Document 2, the battery cap is mainly for preventing leakage from the inside of the battery to the outside, and only covers the vicinity of the boundary between the outer can and the sealing can. With this battery cap, it is difficult to suppress a liquid junction between the outer can and the sealed can on the outside of the battery. Therefore, even in the battery of Patent Document 2, when an infant or the like swallows, conduction between the outer can and the sealed can through the body fluid can easily occur. In this case, an alkaline liquid is generated by electrolysis of the body fluid.

  An object of this indication is to provide the battery which can suppress conduction | electrical_connection with the exterior can and a sealing can through a bodily fluid, when it enters into the body.

  The battery according to the present disclosure has a flat circular shape. The battery includes an outer can, a sealing can, a gasket, and an insulator. The outer can includes an outer wall portion and a bottom portion. The outer wall portion has a cylindrical shape. The bottom part seals one end of the outer wall part. The outer can has one polarity of the positive electrode and the negative electrode. The sealing can includes a top portion and an inner wall portion. The top is opposite the bottom. The inner wall portion is disposed inside the outer wall portion in the radial direction of the battery. The inner wall extends from the top toward the bottom. The inner wall portion has a cylindrical shape. The sealing can has the other polarity of the positive electrode and the negative electrode. The gasket is disposed between the outer wall portion and the inner wall portion. The insulator covers at least one of the entire portion of the outer surface of the sealed can exposed from the outer can and the gasket and the entire outer surface of the outer can.

  According to the present disclosure, when the battery enters the body, conduction between the outer can and the sealing can via the body fluid can be suppressed.

FIG. 1 is a cross-sectional view showing a schematic configuration of the battery according to the first embodiment. FIG. 2 is a diagram schematically showing a state where the battery shown in FIG. 1 is attached to a device. FIG. 3 is a cross-sectional view illustrating a schematic configuration of a battery set including the battery and the punching device illustrated in FIG. 1. FIG. 4 is a cross-sectional view showing a schematic configuration of the battery according to the second embodiment. FIG. 5 is a cross-sectional view showing a schematic configuration of the battery according to the third embodiment.

  The battery according to the embodiment has a flat circular shape. The battery includes an outer can, a sealing can, a gasket, and an insulator. The outer can includes an outer wall portion and a bottom portion. The outer wall portion has a cylindrical shape. The bottom part seals one end of the outer wall part. The outer can has one polarity of the positive electrode and the negative electrode. The sealing can includes a top portion and an inner wall portion. The top is opposite the bottom. The inner wall portion is disposed inside the outer wall portion in the radial direction of the battery. The inner wall extends from the top toward the bottom. The inner wall portion has a cylindrical shape. The sealing can has the other polarity of the positive electrode and the negative electrode. The gasket is disposed between the outer wall portion and the inner wall portion. The insulator covers at least one of the entire portion of the outer surface of the sealed can exposed from the outer can and the gasket and the entire outer surface of the outer can (first configuration).

  In the battery, a part exposed from the outer can and the gasket and / or an outer surface of the outer can of the outer surface of the sealed can is covered with an insulator. That is, the sealing can and the outer can are insulated on the outside of the battery. For this reason, even if it is a case where a battery enters the inside of a body, it can suppress that an exterior can and a sealing can pass through a body fluid on the outer side of a battery. In this case, the electrolysis of body fluid does not proceed. Therefore, the production | generation of the alkaline liquid in a body is prevented.

  In the above battery, the insulator may have rubber-like elasticity (second configuration).

  The battery is attached to the device during use. At this time, the connection terminal of the device passes through the insulator and contacts the sealing can and / or the outer can. According to the 2nd structure, since an insulator has rubber-like elasticity, when attaching a battery to an apparatus, the connection terminal of an apparatus can penetrate an insulator easily. On the other hand, when the battery is removed from the device, the through-hole formed in the insulator by the connection terminal of the device is naturally blocked by the rubber-like elasticity of the insulator. For this reason, the insulation of an exterior can and a sealing can can be maintained.

  The insulator having rubbery elasticity has high adhesion to a sealed can and / or an outer can. For this reason, even when the battery enters the body, the insulator is stably maintained on the sealed can and / or the outer can. Therefore, the insulation between the outer can and the sealed can can be obtained more reliably.

  In the above battery, the insulator may cover the entire portion of the outer surface of the sealed can exposed from the outer can and the gasket, and may cover the entire outer surface of the outer can (third configuration).

  According to the third configuration, both the sealing can having one polarity of the positive electrode and the negative electrode and the outer can having the opposite polarity are covered with the insulator. Thereby, the insulation of an exterior can and a sealing can can be improved further. Therefore, generation | occurrence | production of conduction | electrical_connection with an exterior can and a sealing can through a bodily fluid can be suppressed more reliably.

  Hereinafter, embodiments will be described with reference to the drawings. In the drawings, the same or corresponding components are denoted by the same reference numerals, and the same description is not repeated. For convenience of explanation, in each drawing, the configuration may be simplified or schematically illustrated, or a part of the configuration may be omitted.

<First Embodiment>
[Battery configuration]
FIG. 1 shows a schematic configuration of the battery 10 according to the first embodiment. FIG. 1 is a cross-sectional view of the battery 10 cut along the thickness direction.

  The battery 10 has a flat circular shape. That is, the battery 10 has a diameter larger than the maximum thickness. The battery 10 is a circular battery generally called a coin-type battery or a button-type battery.

  The battery 10 includes an outer can 1, a sealing can 2, a gasket 3, a power generation element 4, and an insulator 5.

  The outer can 1 has a bottomed cylindrical shape and has an opening at one end in the cylinder axis direction. The outer can 1 is substantially circular in a plan view. Hereinafter, for convenience of explanation, the cylinder axial direction of the outer can 1 is simply referred to as an axial direction, and the opening side of the outer can 1 in the axial direction may be referred to as the upper side and the opposite side may be referred to as the lower side. The direction orthogonal to the cylinder axis of the outer can 1 is referred to as the radial direction.

  The outer can 1 includes a bottom portion 11 and a cylindrical outer wall portion 12. The bottom part 11 seals the lower end of the outer wall part 12. That is, the lower edge of the outer wall portion 12 is connected to the peripheral edge of the bottom portion 11 and extends upward from the bottom portion 11. The upper edge portion 12a of the outer wall portion 12 is bent inward in the radial direction.

  The sealing can 2 has a bottomed cylindrical shape and has an opening at one end in the axial direction. The sealing can 2 is substantially circular in plan view. The sealing can 2 includes a top portion 21 and a cylindrical inner wall portion 22. The top portion 21 is disposed above the bottom portion 11 of the outer can 1 and faces the bottom portion 11.

  The inner wall portion 22 is disposed inside the outer wall portion 12 of the outer can 1 in the radial direction. The upper end of the inner wall portion 22 is sealed by the top portion 21. That is, the upper edge of the inner wall portion 22 is connected to the peripheral edge of the top portion 21 and extends downward from the top portion 21. The inner wall portion 22 is expanded in diameter downward by the step portion 22a. In the inner wall portion 22, the outer diameter and inner diameter of the lower edge are larger than the outer diameter and inner diameter of the upper edge, respectively. The inner wall portion 22 extends from the top portion 21 toward the bottom portion 11 and is folded outward in the vicinity of the bottom portion 11.

  The outer can 1 and the sealing can 2 are made of a metal material. Examples of the metal material include iron alloys mainly composed of iron such as iron and stainless steel. As will be described in detail later, the outer can 1 and the sealed can 2 are electrically connected to the power generation element 4. Thereby, the exterior can 1 and the sealing can 2 function as a positive electrode and a negative electrode of the battery 10, respectively.

  The gasket 3 insulates the outer can 1 and the sealed can 2 from each other. The gasket 3 is disposed between the outer wall portion 12 of the outer can 1 and the inner wall portion 22 of the sealing can 2. The gasket 3 is pressed against the inner wall portion 22 by the upper edge portion 12a of the outer wall portion 12 that is caulked inward in the radial direction.

  The gasket 3 includes an outer peripheral portion 31, a lower portion 32, and an inner peripheral portion 33. The outer peripheral portion 31 covers at least a portion of the outer peripheral surface of the inner wall portion 22 of the sealing can 2 that faces the inner peripheral surface of the outer wall portion 12 of the outer can 1. The upper edge of the outer peripheral portion 31 may protrude above the upper edge of the outer wall portion 12 between the outer wall portion 12 and the inner wall portion 22. The lower part 32 and the inner peripheral part 33 cover the lower edge part of the inner wall part 22 and the lower part of the inner peripheral surface of the inner wall part 22, respectively.

  The gasket 3 can be made of a resin material. Examples of the resin material include a polyamide-based resin, a polypropylene resin, and a polyphenylene sulfide resin.

The power generation element 4 is accommodated in a space formed by the outer can 1, the sealing can 2, and the gasket 3. A non-aqueous electrolyte (not shown) containing LiClO ₄ or the like is also accommodated in the space.

  The power generation element 4 includes a positive electrode material 41, a negative electrode material 42, and a separator 43. The positive electrode material 41 and the negative electrode material 42 are each formed in a disk shape. The positive electrode material 41 contains a positive electrode active material such as manganese dioxide. The negative electrode material 42 is composed of a negative electrode active material such as metallic lithium or a lithium alloy. The separator 43 is disposed between the positive electrode material 41 and the negative electrode material 42. The separator 43 is made of, for example, a nonwoven fabric.

  The positive electrode material 41 is in contact with the inner surface of the outer can 1. That is, the outer can 1 is electrically connected to the positive electrode material 41. For this reason, the outer can 1 has a positive polarity.

  The negative electrode material 42 is in contact with the inner surface of the sealing can 2. That is, the sealing can 2 is electrically connected to the negative electrode material 42. For this reason, the sealing can 2 has negative polarity. The sealing can 2 has a polarity opposite to the polarity of the outer can 2.

  It is also possible to configure so that the outer can 1 has a negative polarity and the sealing can 2 has a positive polarity. In this case, the outer can 1 may be electrically connected to the negative electrode material 42, and the sealing can 2 may be electrically connected to the positive electrode material 41.

  The insulator 5 is disposed on the outer surface of the battery body having the outer can 1, the sealing can 2, the gasket 3, and the power generation element 4. The insulator 5 has a substantially circular shape in the plan view of the battery 10. The insulator 5 insulates the outer can 1 and the sealed can 2 on the outer surface of the battery body.

  The insulator 5 covers the entire portion of the outer surface of the sealing can 2 that is exposed from the outer can 1 and the gasket 3. That is, the insulator 5 covers the sealing can 2 from the outside so that at least the sealing can 2 is not exposed in the battery 10.

  The insulator 5 further covers a portion of the outer peripheral portion 31 of the gasket 3 exposed from between the outer wall portion 12 of the outer can 1 and the inner wall portion 22 of the sealing can 2 and the upper edge of the outer wall portion 12. Is preferred. That is, the diameter of the insulator 5 is preferably equal to or greater than the outer diameter of the upper edge of the outer wall portion 12. With such a configuration, the sealing performance of the gasket 3 can be further improved and deterioration of the battery 10 can be suppressed.

  The insulator 5 has rubber-like elasticity. That is, the insulator 5 has low rigidity and a shape restoring force. The rigidity of the insulator 5 is, for example, lower than the rigidity of a connection terminal of a device to be described later, and can be easily penetrated through the connection terminal. The shape restoring force of the insulator 5 is, for example, such that when the connection terminal is pulled out from the insulator 5, the through hole of the insulator 5 formed by the connection terminal can be substantially closed.

  In order to give the insulator 5 rubber-like elasticity, for example, the insulator 5 can be made of a material containing a rubber-based polymer material. Examples of the rubber-based polymer material include silicone rubber, chloroprene rubber, nitrile rubber, and styrene / butadiene rubber.

  However, the insulator 5 should just be what can insulate the exterior can 1 and the sealing can 2, and does not need to have rubber-like elasticity. The insulator 5 can also be comprised with water-resistant materials, such as a polyethylene film, for example.

  The thickness of the insulator 5 can be appropriately determined according to the size of the battery 10, the material of the insulator 5, and the like. The thickness of the insulator 5 may be equal to or greater than the thickness of the separator 43 that insulates the positive electrode material 41 and the negative electrode material 42, for example. When the insulator 5 is made of a general material, if the thickness of the insulator 5 is 10 μm or more, the insulation between the outer can 1 and the sealing can 2 can be sufficiently secured. The upper limit of the thickness of the insulator 5 is not particularly limited, but may be about 3.0 mm.

[Battery manufacturing method]
The battery 10 can be manufactured by preparing a battery body having an outer can 1, a sealing can 2, a gasket 3, and a power generation element 4, and forming an insulator 5 on the battery body. As the battery body, a known coin-type battery or button-type battery can be used. That is, the overall configuration of the battery body and the individual configurations of the outer can 1, the sealing can 2, the gasket 3, and the power generation element 4 are not limited to those described in the present embodiment.

  The insulator 5 can be formed by applying a material or the like. For example, the insulator 5 can be formed by applying a mixture of the above-described rubber-based polymer material or polymer gel material and an organic solvent to the outer surface of the battery body and drying it. The mixture can be applied to the battery body by a method such as dipping, brushing or spraying.

[Battery usage mode]
The battery 10 is used as a power source for the device. When the device is used, the battery 10 is attached to a predetermined position of the device. At this time, it is necessary to make the connection terminal of an apparatus contact the exterior can 1 and the sealing can 2, respectively. In FIG. 2, the state which made the connection terminal of the apparatus contact the exterior can 1 and the sealing can 2 is shown typically.

  As shown in FIG. 2, the negative electrode connection terminal 61 of the device has a sharp tip. The negative electrode connection terminal 61 may have, for example, a conical shape or a polygonal pyramid shape that tapers toward the sealing can 2, or a polygonal plate shape or the like having a corner on the sealing can 2 side. It may be. The negative electrode connection terminal 61 breaks through the insulator 5 by its tip, and comes into contact with the sealing can 2.

  The positive electrode connection terminal 62 of the device is in contact with the outer can 1. In the example of FIG. 2, the positive electrode connection terminal 62 contacts the outer wall portion 12. The positive electrode connection terminal 62 may contact the bottom portion 11. In the present embodiment, since most of the outer surface of the outer can 1 is not covered with the insulator 5, it is not necessary to provide the sharp tip portion for breaking through the insulator 5 in the positive electrode connection terminal 62.

  When the negative electrode connection terminal 61 does not have a tip for breaking through the insulator 5, a through hole may be formed in the insulator 5 with a predetermined instrument. FIG. 3 is a cross-sectional view illustrating a schematic configuration of a battery set 20 including the battery 10 and the instrument 7. The instrument 7 is used to form a through hole in the insulator 5.

  As shown in FIG. 3, the instrument 7 includes a main body portion 71 and a perforation portion 72. The main body 71 has a plate shape. The perforated part 72 is formed in the central part of one surface of the main body part 71. The perforated part 72 has a sharp tip, like the negative electrode connection terminal 61 shown in FIG.

  A through hole is formed in the insulator 5 by making the perforated part 72 face the insulator 5 and pressing the instrument 7 against the battery 10. The through hole of the insulator 5 may be formed at a position corresponding to a connection terminal of a device to which the battery 10 is attached. When the insulator 5 has rubber-like elasticity, the through hole is closed after the perforated portion 72 is pulled out from the insulator 5, but the connection terminal can be easily inserted into the insulator 5 once pierced. . Therefore, the connection terminal can be easily brought into contact with the sealing can 2.

  The instrument 7 may be formed of, for example, a conductive metal material such as stainless steel, iron, or nickel. In this case, the battery 10 may be attached to the device together with the appliance 7. That is, the battery 10 can be attached to the device in a state where the perforated part 72 of the device 7 passes through the insulator 5 and contacts the sealing can 2 and a part of the device 7 contacts the negative electrode connection terminal 61 of the device. it can. Thereby, the negative electrode connection terminal 61 and the sealing can 2 can be electrically connected via the instrument 7.

[effect]
In the battery 10 according to the present embodiment, the sealing can 2 is covered with the insulator 5 so as not to be exposed. Therefore, the sealing can 2 is insulated from the outer can 1 outside the battery 10. Thereby, even if the battery 10 enters the body, the exterior can 1 and the sealing can 2 can be prevented from conducting through the body fluid outside the battery 10. For this reason, the electrolysis of body fluid does not proceed, and the production of alkaline liquid in the body can be prevented.

  In the battery 10 according to this embodiment, the insulator 5 has rubber-like elasticity. For this reason, the negative electrode connection terminal 61 of an apparatus penetrates the insulator 5 easily. Therefore, when attaching the battery 10 to an apparatus, the negative electrode connection terminal 61 can be smoothly brought into contact with the sealing can 2.

  After the negative electrode connection terminal 61 of the device is pulled out from the insulator 5, the through hole formed in the insulator 5 is naturally blocked by rubber-like elasticity. For this reason, the battery 10 can maintain the insulation between the outer can 1 and the sealing can 2 even when the attachment to the device and the removal from the device are repeated.

  The insulator 5 adheres well to the sealing can 2 due to its rubber-like elasticity. Therefore, the insulator 5 is stably maintained on the sealing can 2 even when the battery 10 enters the body. For this reason, the insulation of the exterior can 1 and the sealing can 2 can be obtained more reliably.

Second Embodiment
[Battery configuration]
FIG. 4 shows a schematic configuration of a battery 10A according to the second embodiment. FIG. 4 is a cross-sectional view of the battery 10A cut along the thickness direction.

  The battery 10 </ b> A includes an outer can 1, a sealing can 2, a gasket 3, and a power generation element 4 similar to the battery 10 according to the first embodiment. The battery 10A is different from the battery 10 according to the first embodiment in the configuration of the insulator 5A.

  The insulator 5A covers not only the outer surface of the sealed can 2 but also the entire outer surface of the outer can 1. For this reason, in the battery 10A, the outer can 1 and the sealed can 2 are not exposed. The insulator 5 </ b> A also covers the surface of the gasket 3 between the outer wall portion 12 of the outer can 1 and the inner wall portion 22 of the sealing can 2. That is, the insulator 5A covers the entire outer surface of the battery body. The material and formation method of the insulator 5A are the same as those of the insulator 5 of the battery 10 according to the first embodiment.

  In a device to which the battery 10A is attached, it is preferable that both the positive electrode connection terminal and the negative electrode connection terminal have a sharp tip for breaking through the insulator 5A, like the negative electrode connection terminal 61 shown in FIG. When at least one of the connection terminals does not have such a tip, a through hole may be formed at a position corresponding to the connection terminal in the insulator 5A by the perforated part 72 of the instrument 7 shown in FIG.

[effect]
In the battery 10A according to the present embodiment, both the outer surface of the outer can 1 that functions as a positive electrode and the outer surface of the sealing can 2 that functions as a negative electrode are covered with an insulator 5A. For this reason, the insulation of the exterior can 1 and the sealing can 2 can be further improved outside the battery 10A. Therefore, when the battery 10A enters the body, it is possible to more reliably prevent the outer can 1 and the sealing can 2 from being conducted through the body fluid.

  The battery 10A according to the present embodiment is configured such that the insulator 5A covers the entire outer surface of the battery body. For this reason, for example, when a material for forming the insulator 5A is applied to the battery body, the material may be applied to the entire battery body, and it is not necessary to select and apply a specific part of the battery body. . Therefore, the battery 10A can be easily manufactured.

<Third Embodiment>
[Battery configuration]
FIG. 5 shows a schematic configuration of a battery 10B according to the third embodiment. FIG. 5 is a cross-sectional view of the battery 10B cut along the thickness direction.

  The battery 10 </ b> B includes an outer can 1, a sealing can 2, a gasket 3, and a power generation element 4 similar to the battery 10 according to the first embodiment. The battery 10B is different from the battery 10 according to the first embodiment and the battery 10A according to the second embodiment in the configuration of the insulator 5B.

  The insulator 5 of the battery 10 according to the first embodiment covers the entire portion of the outer surface of the sealing can 2 that is exposed from the outer can 1 and the gasket 3. In addition, the insulator 5A of the battery 10A according to the second embodiment also covers the entire outer surface of the outer can 1. On the other hand, the insulator 5B of the battery 10B according to the present embodiment covers the entire outer surface of the outer can 1 but does not substantially cover the outer surface of the sealing can 2. That is, in this embodiment, not the sealed can 2 but the outer can 1 is covered with the insulator 5B so as not to be exposed. However, the material and forming method of the insulator 5B are the same as those in the first embodiment and the second embodiment.

  The insulator 5 </ b> B preferably covers at least a part of the surface of the gasket 3 between the outer wall portion 12 of the outer can 1 and the inner wall portion 22 of the sealing can 2. More preferably, the insulator 5B covers the entire surface of the gasket 3. That is, the upper end portion of the insulator 5B extends from the upper edge portion 12a of the outer wall portion 12 toward the inside in the radial direction, and preferably reaches at least the gasket 3 and reaches the sealing can 2. Further preferred.

  In the device to which the battery 10B is attached, the positive electrode connection terminal preferably has a sharp tip for breaking through the insulator 5B, like the negative electrode connection terminal 61 shown in FIG. When the positive electrode connection terminal does not have such a tip portion, a through hole may be formed at a position corresponding to the positive electrode connection terminal in the insulator 5B by the perforated portion 72 of the instrument 7 shown in FIG.

[effect]
In the battery 10B according to the present embodiment, the outer can 1 is insulated from the sealing can 2 outside the battery 10B by covering the outer can 1 with the insulator 5B. Even in this configuration, as in the first and second embodiments, conduction between the outer can 1 and the sealing can 2 when the battery 10B enters the body can be suppressed.

  Although the embodiments have been described above, the present disclosure is not limited to the above-described embodiments, and various modifications can be made without departing from the gist thereof.

  10, 10A, 10B: battery, 1: exterior can, 11: bottom, 12: outer wall, 2: sealing can, 21: top, 22: inner wall, 3: gasket, 5, 5A, 5B: insulator

Claims (3)

A battery having a flat circular shape,
An outer can having a cylindrical shape, and a bottom that seals one end of the outer wall, and an outer can having one polarity of a positive electrode and a negative electrode;
A top portion that faces the bottom portion, and an inner wall portion that is disposed inside the outer wall portion in the radial direction of the battery, extends from the top portion toward the bottom portion, and has a cylindrical shape. A sealed can with polarity;
A gasket disposed between the outer wall portion and the inner wall portion;
An insulator that covers at least one of the whole of the outer surface of the sealing can, and the entire portion exposed from the outer can and the gasket, and the outer surface of the outer can;
A battery comprising: The battery according to claim 1,
The insulator is a battery having rubber-like elasticity. The battery according to claim 1 or 2,
The said insulator covers the whole of the part exposed from the said exterior can and the said gasket among the outer surfaces of the said sealing can, and the whole outer surface of the said exterior can.

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