JP2011014452A - Method of attaching flat battery, and device attached to tire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flat battery advantageous for preventing an internal component from being damaged by an impact or vibration.SOLUTION: This method of attaching the flat battery 4 used in a device 1 provided with a substrate 3 and attached to a tire 7 is constituted to arrange the flat battery 4 in an inner side of the substrate 3, in view from the rotation center 10 of the tire 7. The impact or vibration is thereby applied to the substrate 3 more directly than to the flat battery 4, to moderate the impact or vibration applied to the flat battery 4. A temperature of the flat battery 4 is also restrained from being elevated caused by transmitting heat of the tire 7 to the flat battery 4. Further, battery performance is prevented advantageously from getting worse, because an electrolyte flows by a centrifugal force.

Description

  The present invention relates to a method for mounting a flat battery used in a device provided with a substrate and attached to a tire, and a device attached to a tire using the flat battery provided with a substrate.

  A flat battery called a coin battery or a button battery is used as a power source mainly for memory backup of information equipment and video equipment. A flat battery is a combination of an outer can that is a positive electrode can and a sealed can that is a negative electrode can. A flat battery contains a power generation element and is filled with a non-aqueous electrolyte. The power generation element has a positive electrode material and a negative electrode material arranged via a separator.

  On the other hand, a flat battery may be used as a power source for a device attached to a rotating part. As such a device, for example, a device used in a tire air pressure monitoring system for monitoring tire air pressure of a running car can be cited. Some tire pressure monitoring systems have a specification in which a transmitter with a built-in flat battery and a detection pressure is attached to a tire wheel which is a rotating part.

  According to this specification, the flat battery rotates integrally with the tire and a centrifugal force is applied, and the battery performance may deteriorate due to the flow of the electrolyte solution due to the centrifugal force. For this reason, Patent Document 1 below proposes a battery mounting method in which the battery is mounted on the apparatus in a direction in which the negative electrode material is present in the direction of centrifugal force.

  As another specification, Patent Document 2 proposes that a transmitter is directly attached to the inner surface of a tire.

Japanese Patent Laid-Open No. 11-242948 JP 2008-154193 A

  However, when a flat battery is attached to a tire as described above, the flat battery receives not only a centrifugal force larger than that when attached to a wheel, but also a direct impact / vibration caused by the running of an automobile. It will be.

  In this case, the flat battery has a high possibility of breakage of the positive electrode material, and the possibility of the separator being cut and broken due to the displacement of the positive electrode material is also increased.

  The present invention solves the conventional problems as described above, and provides a flat battery mounting method and a tire mounting device that are advantageous for preventing damage to internal components of the flat battery due to impact and vibration. With the goal.

  In order to achieve the above object, a flat battery mounting method according to the present invention is a flat battery mounting method used in a device provided with a substrate and mounted on a tire, as viewed from the center of rotation of the tire. A flat battery is arranged inside the substrate.

  The device attached to the tire of the present invention is a device that includes a substrate and uses a flat battery, and is attached to the tire. The device is mounted on the inside of the substrate as viewed from the center of rotation of the tire. It is characterized by being used in an arranged state.

  The present invention is advantageous in preventing damage to internal components of a flat battery due to shock and vibration.

Schematic of the attachment method of the flat battery which concerns on one embodiment of this invention. The perspective view of the flat battery used for one embodiment of this invention. Sectional drawing in the AA line of FIG. The exploded view of the device concerning another embodiment of the present invention. Schematic of the attachment method of the flat battery which concerns on another embodiment of this invention.

  According to the flat battery mounting method and the tire mounting apparatus of the present invention, the flat battery is arranged on the inner side of the substrate as seen from the center of rotation of the tire, thereby reducing the impact and vibration on the flat battery. In addition, the temperature rise can be suppressed, and the battery performance can be prevented from lowering due to centrifugal force.

  In the flat battery mounting method and the tire mounting apparatus of the present invention, a terminal is provided on the flat battery side of the substrate, and the flat battery is in contact with the terminal. A device is preferably attached to the tire. According to this configuration, the contact property between the flat battery and the terminal is improved, and the conductivity is improved.

  In addition, the device includes a case for housing the substrate and the flat battery, and the case has an opening for housing the flat battery, and the opening is closed by a lid. It is preferable. According to this configuration, the flat battery is stably fixed.

  The mass of the flat battery is preferably larger than the mass of the substrate.

(Embodiment 1)
Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a schematic diagram of a flat battery mounting method according to an embodiment of the present invention. A two-dot chain line shows an outline of a part of the outer shape of the rotating object 7, and is, for example, a part of a tire of an automobile.

  The apparatus 1 is fixed to the rotating object 7, and when the rotating object 7 rotates in the direction of arrow a, the apparatus 1 rotates integrally with the apparatus in the direction of arrow a. The device 1 houses a substrate 3 and a flat battery 4 in a case 2. The flat battery 4 is a combination of an outer can 8 that is a positive electrode can and a sealing can 9 that is a negative electrode can. A terminal 5 is joined to the outer can 8 and a terminal 6 is joined to the sealing can 9. The terminals 5 and 6 are connected to the substrate 3. An example of the flat battery 4 is one having an outer diameter of 20 mm and a thickness of 5 mm.

  When the device 1 is a transmitter of a tire pressure monitoring system, for example, a signal of the detected pressure detected by the device 1 is transmitted by radio waves to a receiver (not shown) on the vehicle body side. In this example, electronic components such as a pressure sensor for detecting air pressure and a signal processing circuit for transmitting a detected pressure from the pressure sensor to a receiver on the vehicle body side by radio waves are mounted on the substrate 3. The flat battery 4 serves as a power supply source for the substrate 3.

  In the configuration of FIG. 1, the flat battery 4 is disposed inside the substrate 3 when viewed from the rotation center 10 of the rotating object 7. In this embodiment, the flat battery 4 is protected by this configuration. This will be described below after the structure of the flat battery 4 is described.

  FIG. 2 shows a perspective view of the flat battery 4 shown in FIG. In the figure, illustration of the terminals 5 and 6 is omitted. 3 is a cross-sectional view taken along line AA in FIG. The flat battery 4 is a combination of an outer can 8 that is a positive electrode can and a sealing can 9 that is a negative electrode can. The outer can 8 and the sealed can 9 can be formed, for example, by press-molding a stainless material. In FIG. 3, the outer can 8 has a cylindrical shape in which a peripheral wall 12 is erected on the outer periphery of the bottom portion 11 and one end is opened. The sealing can 9 has a cylindrical shape in which a peripheral wall 14 is erected on the outer periphery of the bottom portion 13 and one end is opened. A gasket 15 is interposed between the inner peripheral surface of the peripheral wall 12 of the outer can 8 and the outer peripheral surface of the peripheral wall 14 of the sealing can 9. The gasket 15 is a resin molded product, for example, molded with a resin composition containing polyphenylene sulfide (PPS) as a main component and containing an olefin elastomer.

  The front end 12 a of the peripheral wall 12 of the outer can 8 is curved toward the central axis 16 side of the sealing can 9, and the outer can 8 is caulked and fixed to the sealing can 9. As a result, the gap between the outer can 8 and the sealed can 9 is sealed by the gasket 15, and the outer can 8 and the sealed can 9 having different polarities are insulated.

  In the flat battery 4, a power generation element 17 is accommodated and filled with a nonaqueous electrolytic solution. The power generation element 17 includes a positive electrode material 18 in which a positive electrode active material or the like is hardened in a disk shape, a negative electrode material 19 in which metal lithium or a lithium alloy as a negative electrode active material is formed in a disk shape, and a nonwoven fabric separator 20. . A positive electrode material 18 and a negative electrode material 19 are arranged with a separator 20 interposed therebetween. A positive electrode ring 21 made of stainless steel or the like is attached to the outer surface of the positive electrode material 18.

  The positive electrode material 18 is obtained by forming a positive electrode active material into a disc shape integrally with the positive electrode ring 21. Examples of the positive electrode active material include a material obtained by molding a positive electrode mixture prepared by mixing manganese dioxide with graphite, a tetrafluoroethylene-hexafluoropropylene copolymer, and hydroxypropylcellulose.

  The separator 20 is formed of a nonwoven fabric, for example, a nonwoven fabric made of polybutylene terephthalate fibers.

The flat battery 4 contains an electrolytic solution, and the separator 20 is impregnated with a nonaqueous electrolytic solution. As the non-aqueous electrolyte, for example, a solution in which LiClO ₄ is dissolved in a solvent in which propylene carbonite and 1,2-dimethoxyethane are mixed can be used. The thickness of the separator 20 is, for example, about 0.3 to 0.4 mm.

  Here, in FIG. 1, since the device 1 is fixed to the rotating object 7, the device 1 rotates as the rotating object 7 rotates. When the rotating object 7 is, for example, an automobile tire, the device 1 attached to the rotating object 7 by running on the road is subjected to impact and vibration.

  In this case, if the impact / vibration received by the flat battery 4 built in the device 1 is increased, the possibility of damage to the internal components of the flat battery 4 is increased. Specifically, when the flat battery 4 receives impact / vibration, the positive electrode material 18 integrated with the positive electrode ring 21 may move and vibrate separately from the outer can 8 and the positive electrode material 5 may be damaged. Further, due to the movement / vibration of the positive electrode material 18, the separator 20 may receive impact / vibration from the positive electrode material 18, and the separator 20 may be cut and damaged.

  In the present embodiment, as described above, the flat battery 4 is arranged on the inner side of the substrate 3 when viewed from the rotation center 10 of the rotating object 7, thereby preventing damage to the internal components of the flat battery 4. .

  Specifically, as shown in FIG. 1, the substrate 3 is outside the flat battery 4 when viewed from the rotation center 10 of the rotating object 7. That is, the substrate 3 is on the outer side of the rotating object 7 than the flat battery 4. For this reason, the impact from the outside of the rotating body 7 is directly applied by the substrate 3 between the substrate 3 and the flat battery 4, and the impact and vibration to the flat battery 4 are alleviated. .

  Therefore, in the configuration of FIG. 1, the flat battery 4 is advantageous for preventing damage to the positive electrode material 18 and the separator 20 as described above. On the other hand, impact from the outside is directly applied to the substrate 3, but the substrate is more resistant to vibration and impact than the flat battery. For this reason, even if the board | substrate 3 is arrange | positioned outside the flat battery 4, it does not become a special disadvantage for the damage prevention of the board | substrate 3. FIG.

  Further, when the rotating object 7 is an automobile tire, frictional heat due to road running is also transmitted to the device 1. In this case, the frictional heat is directly applied to the substrate 3 outside the flat battery 4. Therefore, the configuration in which the substrate 3 is disposed outside the flat battery 4 can suppress the temperature rise of the flat battery 4 as compared with the configuration in which the flat battery 4 is disposed outside the substrate 3. For this reason, the configuration in which the substrate 3 is disposed outside the flat battery 4 is advantageous for the flat battery 4 in which it is desirable to avoid use at high temperatures, compared to the configuration in which the substrate 3 is disposed inside the flat battery 4. It becomes use environment.

  Next, in FIG. 1, when the rotating object 7 rotates in the direction of arrow a, centrifugal force acts in the direction of arrow b on the device 1 and the flat battery 4 built in the device 1. As described above, the electrolyte is accommodated in the flat battery 4. When the centrifugal force increases, the battery performance may deteriorate due to the flow of the electrolyte solution due to the centrifugal force.

  The configuration in which the substrate 3 is arranged outside the flat battery 4 as in the present embodiment is more advantageous in preventing the battery performance from being deteriorated by centrifugal force than the configuration in which the flat battery 4 is arranged outside the substrate 3. It has become.

  Specifically, when the rotational speed of the rotating object 7 is constant in FIG. 1, the centrifugal force acting on the flat battery 4 is proportional to the distance from the rotation center 10 to the flat battery 4. For this reason, the centrifugal force acting on the flat battery 4 decreases as the position of the flat battery 4 approaches the rotation center 10.

  Therefore, as in the configuration of FIG. 1, the configuration in which the substrate 3 is disposed outside the flat battery 4 has the flat battery 4 at the rotation center 10 as compared with the configuration in which the flat battery 4 is disposed outside the substrate 3. It is in an approaching position, which is advantageous for preventing deterioration of battery performance due to centrifugal force.

  Here, in a device equipped with a substrate and using a flat battery and attached to a tire, the flat battery 4 is placed outside the substrate 3 when viewed from the rotation center 10 of the rotating object 7, contrary to the configuration of FIG. 1. It is usual to arrange. This is because it is normal that the rotation of the device 1 is more stable when the flat battery 4 having a larger mass and larger centrifugal force than the substrate 3 is disposed outside the substrate 3.

  In the present embodiment, contrary to such a normal design method, the flat battery 4 is arranged on the inner side of the substrate 3 when viewed from the rotation center 10 of the rotating object 7, and the flat battery is formed as described above. This is intended to mitigate impact / vibration on the battery 4, suppress temperature rise, and prevent battery performance from being lowered due to centrifugal force.

(Embodiment 2)
FIG. 4 is an exploded view of the device 30 according to the second embodiment. The use of the device 30 is the same as that of the device 1 of the first embodiment. The device 30 is attached to a rotating object, and is, for example, a transmitter of a tire pressure monitoring system. The device 1 and the device 30 are different in connection structure with a substrate via a terminal.

  An insulating plate 32 is provided in the case 31, and a substrate 33 is disposed on the insulating plate 32. A terminal 34 that contacts the sealing can 9 of the flat battery 4 and a terminal 35 that contacts the outer can 8 are attached to the substrate 33. The terminal 34 is a leaf spring and can be displaced toward the substrate 33 when it contacts the sealing can 9.

  The flat battery 4 has the same configuration as that of the flat battery 4 shown in FIGS. 2 and 3, but in the second embodiment, the terminal 5 and the terminal 6 shown in FIG. 1 are not joined. This is different from Form 1. After the flat battery 4 is stored in the case 31, the opening of the case 31 is closed with the lid 36. The lid 36 may be a screw-in type, for example.

  FIG. 5 shows a schematic diagram of a battery mounting method according to Embodiment 2 of the present invention. As in FIG. 1, a two-dot chain line schematically shows a part of the outer shape of the rotating object 7, for example, a part of an automobile tire or wheel. In addition, the device 30 is fixed to the rotating object 7, and when the rotating object 7 rotates in the direction of arrow a, the device 30 also rotates integrally with this in the direction of arrow a.

  In the state of FIG. 5, the opening of the case 31 is closed with a lid 36 and houses the substrate 33 and the flat battery 4 in the device 30. A terminal 34 contacts the sealing can 9 of the flat battery 4, and a terminal 35 contacts the outer can 8.

  Also in the configuration of FIG. 5, as in the configuration of FIG. 1, the flat battery 4 is disposed inside the substrate 33 when viewed from the rotation center 10 of the rotating object 7. Thereby, also in the present embodiment, as in the first embodiment, the impact / vibration on the flat battery 4 can be alleviated, the temperature rise can be suppressed, and the battery performance can be prevented from being lowered due to centrifugal force. . In the present embodiment, even when the flat battery 4 having no terminal bonded thereto is used, the contact between the flat battery 4 and the terminal can be improved, and the conductivity can be improved.

  Specifically, in FIG. 5, when the rotating object 7 rotates in the direction of arrow a, centrifugal force acts in the direction of arrow b on the device 30 and the flat battery 4 built in the device 30. In this case, a centrifugal force acts on the flat battery 4 in the direction of arrow b so as to push the terminal 34. As a result, the contact between the sealing can 9 and the terminal 34 of the flat battery 4 is improved, and the conductivity is improved. In addition, by providing the lid 36, the flat battery 4 can be sandwiched between the terminal 34 and the lid 36, and the flat battery 4 is stably fixed.

  In addition, although the dimension of the flat battery 4 and the material of component parts were demonstrated using FIGS. 1-3, these are an example, The thing of another dimension may be used, Even if it uses another material, Good.

  As described above, according to the present invention, it is advantageous for preventing damage to the internal parts of the flat battery due to shock / vibration. Therefore, the present invention provides a method for mounting a flat battery used for a tire that is susceptible to shock / vibration, and It is particularly useful for devices attached to tires.

DESCRIPTION OF SYMBOLS 1,30 Apparatus 2,31 Case 3,33 Board | substrate 4 Flat battery 5, 6, 34, 35 Terminal 7 Rotating thing 8 Exterior can 9 Sealing can 10 Rotation center 36 Lid

Claims (8)

A flat battery mounting method for use in a device equipped with a substrate and mounted on a tire,
A flat battery mounting method, wherein the flat battery is disposed inside the substrate as viewed from the center of rotation of the tire.   The flat battery mounting method according to claim 1, wherein a terminal is provided on the flat battery side of the substrate, and the device is mounted on the tire in a state where the flat battery is in contact with the terminal.   The apparatus includes a case for housing the substrate and the flat battery, wherein the case forms an opening for housing the flat battery, and the opening is closed by a lid. 3. A flat battery mounting method according to 1 or 2.   The flat battery mounting method according to claim 1, wherein a mass of the flat battery is larger than a mass of the substrate. A device equipped with a substrate and using a flat battery, attached to a tire,
The apparatus is used in a state where the flat battery is disposed inside the substrate when viewed from the center of rotation of the tire.   The device attached to the tire according to claim 5, wherein a terminal is provided on the flat battery side of the substrate, and the device is attached to the tire in a state where the flat battery is in contact with the terminal.   The apparatus includes a case for housing the substrate and the flat battery, wherein the case forms an opening for housing the flat battery, and the opening is closed by a lid. The apparatus attached to the tire of 5 or 6.   The apparatus attached to the tire in any one of Claim 5 to 7 with which the mass of the said flat battery is large compared with the mass of the said board | substrate.

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