JP2012256571A - Flat battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain such a configuration, where one member is less likely to be removed from a base for holding any one member of a positive electrode material or a negative electrode material even if an impact is applied thereto, in a flat battery where the base is secured to an outer can.SOLUTION: The flat battery (1) comprises: a bottomed cylindrical positive electrode can (10) (outer can); a negative electrode can (20) (sealing can) disposed to cover the opening of the positive electrode can (10); a positive electrode material (41) and a negative electrode material (42) interposed between the positive electrode can (10) and the negative electrode can (20); and a positive electrode ring (44) (base) fixed onto the inner surface of the positive electrode can (10) while holding any one member of the positive electrode material (41) or negative electrode material (42). The positive electrode ring (44) has a sidewall (44a) covering a part of the one member, and at least one protrusion (44c) (engaging part) for holding the one member is provided on the sidewall (44a).

Description

  The present invention relates to a flat battery such as a coin battery.

  Conventionally, a positive electrode material and a negative electrode material are arranged between a bottomed cylindrical outer can and a sealing can arranged to cover the opening of the outer can, and either the positive electrode material or the negative electrode material A flat battery in which a pedestal for holding the battery is fixed to an outer can is known. As such a flat battery, for example, as disclosed in Patent Document 1, a configuration in which a positive electrode ring fixed to a positive electrode pellet is welded to the positive electrode can from the inside of the positive electrode can by resistance welding or laser welding. Are known.

JP 2008-103109 A

  By the way, in the structure which fixes the base (positive electrode ring) which hold | maintains a positive electrode material (positive electrode pellet) with respect to an exterior can (positive electrode can) like the structure currently disclosed by the above-mentioned patent document 1, Before mounting the positive electrode material on the base, it is necessary to fix the pedestal to the outer can.

  In general, the positive electrode material is molded in the pedestal using a mold or the like. However, in the state where the pedestal is fixed to the outer can as described above, it is difficult to mold the positive electrode material in the pedestal. Therefore, for example, a method of mounting the positive electrode material in the pedestal by placing the positive electrode material formed in a block shape in a pedestal fixed to the outer can and crushing the member is conceivable.

  However, when the positive electrode material is mounted in the pedestal by the method described above, the adhesion of the positive electrode material to the pedestal is lower than when the positive electrode material is molded in the pedestal using a mold or the like.

  In particular, when a flat battery is used in an environment where a strong impact is applied, such as a power supply for a tire air pressure detection device that detects the tire air pressure, the positive battery may be detached from the pedestal due to the impact received by the flat battery. There is. If the positive electrode material is detached from the pedestal in the flat battery, the contact between the positive electrode material and the outer can becomes unstable, and the internal resistance of the flat battery increases, so that the battery performance may be significantly lowered.

  An object of the present invention is to provide a flat battery for fixing a pedestal for holding either a positive electrode material or a negative electrode material with respect to an outer can. It is to obtain a difficult configuration.

  A flat battery according to an embodiment of the present invention is disposed between a bottomed cylindrical outer can, a sealing can disposed so as to cover an opening of the outer can, and the outer can and the sealing can. A positive electrode material and a negative electrode material, and a base fixed on the inner surface of the outer can while holding one member of the positive electrode material and the negative electrode material, and the base is one of the one member A side wall portion covering the first portion, and at least one locking portion for holding the one member is provided on the side wall portion (first configuration).

  With the above configuration, either the positive electrode material or the negative electrode material can be held in the pedestal fixed to the outer can. That is, since the locking portion for holding the one member is provided on the side wall of the pedestal, the locking member can prevent the one member from coming off the pedestal.

  Therefore, even when the flat battery is subjected to an impact, the above-described configuration can prevent the internal resistance of the battery from increasing due to the removal of the one member from the base fixed to the outer can.

  In the first configuration, the locking portion includes at least one of a projecting portion and a concave portion provided on a surface of the side wall portion on the pedestal inward side, and the one member is locked on the outer peripheral side thereof. It arrange | positions in the said base so that a part may be engaged (2nd structure).

  Thereby, the latching | locking part formed in the surface inside the base in the side wall part of a base and the outer peripheral side of one member can engage, and this one member can be latched in a base. .

  Particularly, in the second configuration, the locking portion is formed by deforming a side wall portion of the pedestal in a thickness direction thereof (third configuration). By carrying out like this, a latching | locking part can be easily formed in the side wall part of a base. And since a comparatively big protrusion part or recessed part is formed in this side wall part by deform | transforming a side wall part in the thickness direction, one member can be more reliably latched with respect to this side wall part.

  Further, in the second or third configuration, the one member includes a columnar block member extending in the axial direction in the pedestal so that the axial direction coincides with the height direction of the side wall portion of the pedestal. In this state, it is mounted in the pedestal by being crushed in the axial direction, and the protruding portion has a protruding height perpendicular to the axial direction of the block member when the block member is crushed. It is smaller than the amount of deformation in the direction (fourth configuration).

  Thereby, it can prevent that a block member interferes with the protrusion part provided in the side wall part of the base. Therefore, the block member can be easily arranged in the pedestal. Then, by crushing the columnar block member extending in the axial direction in the pedestal in the axial direction, either the positive electrode material or the negative electrode material can be mounted in the pedestal.

  In addition, the projecting portion provided on the side wall portion of the pedestal can be caused to bite into the outer peripheral side of the one member by the forming method as described above. Thereby, the said one member can be hold | maintained more reliably in a base.

  Furthermore, in the first configuration, the locking portion is configured by an opening provided in a side wall portion of the pedestal, and a part of the one member mounted in the pedestal is in the opening. (Fifth configuration).

  Thus, by positioning a part of the one member in the opening, the one member can be held in the pedestal.

  In the flat battery according to the embodiment of the present invention, a locking portion for holding either the positive electrode material or the negative electrode material is provided on the side wall portion of the base fixed to the outer can. Thereby, even if an impact is applied to the flat battery, it is possible to suppress the removal of the one member from the pedestal.

FIG. 1 is a cross-sectional view showing a schematic configuration of a flat battery according to Embodiment 1 of the present invention. FIG. 2 is a perspective view showing a schematic configuration of the positive electrode ring. FIG. 3 is a cross-sectional view schematically showing a state in which the block member is arranged in the positive electrode ring. FIG. 4 is an enlarged cross-sectional view showing a positive ring locking structure of a flat battery according to Embodiment 2 of the present invention. FIG. 5 is an enlarged cross-sectional view illustrating a positive ring locking structure of a flat battery according to Embodiment 3 of the present invention. FIG. 6 is an enlarged cross-sectional view showing a positive ring locking structure of a flat battery according to Embodiment 4 of the present invention. FIG. 7 is a cross-sectional view showing a schematic configuration of a flat battery according to Embodiment 5 of the present invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The same or corresponding parts in the drawings are denoted by the same reference numerals and description thereof will not be repeated.

[Embodiment 1]
(overall structure)
FIG. 1 is a cross-sectional view showing a schematic configuration of a flat battery 1 according to an embodiment of the present invention. The flat battery 1 includes a bottomed cylindrical positive electrode can 10 (exterior can), a negative electrode can 20 (sealing can) covering the opening of the positive electrode can 10, an outer peripheral side of the positive electrode can 10, and an outer periphery of the negative electrode can 20. And a power generation element 40 housed in a space formed between the positive electrode can 10 and the negative electrode can 20. The flat battery 1 is formed in a flat coin shape as a whole by combining the positive electrode can 10 and the negative electrode can 20 together. In addition to the power generation element 40, a non-aqueous electrolyte (not shown) is also enclosed in the space formed between the positive electrode can 10 and the negative electrode can 20.

  The positive electrode can 10 is made of a metal material such as stainless steel, and is formed into a bottomed cylindrical shape by press molding. The positive electrode can 10 includes a circular bottom portion 11 and a cylindrical peripheral wall portion 12 formed continuously with the bottom portion 11 on the outer periphery thereof. The peripheral wall portion 12 is provided so as to extend perpendicularly to the bottom portion 11 in a longitudinal sectional view. As described later, the positive electrode can 10 is crimped to the outer peripheral portion of the negative electrode can 20 by bending the opening end side of the peripheral wall portion 12 inward with the gasket 30 sandwiched between the positive electrode can 10 and the negative electrode can 20. ing.

  Similarly to the positive electrode can 10, the negative electrode can 20 is made of a metal material such as stainless steel and is formed in a bottomed cylindrical shape by press molding. The negative electrode can 20 includes a circular flat surface portion 21 and a cylindrical peripheral wall portion 22 formed continuously with the flat surface portion 21 on the outer periphery thereof. Similar to the positive electrode can 10, the peripheral wall portion 22 is also provided so as to extend perpendicularly to the flat portion 21 in a longitudinal sectional view. The peripheral wall portion 22 has an enlarged diameter portion 22b whose diameter increases stepwise with respect to the base end portion 22a of the peripheral wall portion 22. That is, the peripheral wall portion 22 is formed with a step portion 22c between the base end portion 22a and the enlarged diameter portion 22b. As shown in FIG. 1, the open end side of the peripheral wall portion 12 of the positive electrode can 10 is bent and caulked with respect to the step portion 22c. Thereby, the positive electrode can 10 and the negative electrode can 20 are connected on the outer peripheral side thereof.

  The gasket 30 is mainly composed of polyphenylene sulfide (PPS), and is made of a resin composition containing an olefin elastomer in PPS. The gasket 30 is disposed so as to be sandwiched between the peripheral wall portion 12 of the positive electrode can 10 and the peripheral wall portion 22 of the negative electrode can 20. Specifically, the gasket 30 includes a ring-shaped base portion 31, an outer cylindrical wall 32 protruding from the outer peripheral edge of the base portion 31, and the outer peripheral wall 32 from the inner peripheral edge of the base portion 31 in the same direction. And an extending inner cylindrical wall 33. In the present embodiment, the gasket 30 is formed integrally with a base portion 31, an outer cylindrical wall 32, and an inner cylindrical wall 33.

  As shown in FIG. 1, the gasket 30 is configured so that the base portion 31 is sandwiched between the outer peripheral side of the bottom portion 11 of the positive electrode can 10 and the open end of the enlarged diameter portion 22 b of the negative electrode can 20. It is arranged on the bottom 11 inside. Thereby, the enlarged diameter portion 22 b of the negative electrode can 20 is positioned between the outer cylinder wall 32 and the inner cylinder wall 33 of the gasket 30. The outer cylindrical wall 32 of the gasket 30 is sandwiched between the peripheral wall portion 12 of the positive electrode can 10 and the peripheral wall portion 22 of the negative electrode can 20. The base portion 31 and the outer cylindrical wall 32 of the gasket 30 are sandwiched between the peripheral wall portion 12 of the positive electrode can 10 and the peripheral wall portion 22 of the negative electrode can 20, and the peripheral wall portion 12 of the positive electrode can 10 and the negative electrode can It has a thickness that can seal a gap with 20 peripheral wall portions 22.

  Thus, by arranging the gasket 30 between the peripheral wall portion 12 of the positive electrode can 10 and the peripheral wall portion 22 of the negative electrode can 20, the positive electrode can 10 and the negative electrode can 20 can be insulated on the outer peripheral side thereof. it can. In addition, with the gasket 30 sandwiched between the peripheral wall portion 12 of the positive electrode can 10 and the peripheral wall portion 22 of the negative electrode can 20, the peripheral wall portion 12 of the positive electrode can 10 is folded and connected to the peripheral wall portion 22 of the negative electrode can 20. By tightening, the gasket 30 can seal between the peripheral wall portion 12 of the positive electrode can 10 and the peripheral wall portion 22 of the negative electrode can 20. That is, the gasket 30 includes the outer cylindrical wall 32 sandwiched between the peripheral wall portion 12 of the positive electrode can 10 and the step portion 22 c of the negative electrode can 20, and the opening end of the peripheral wall portion 22 of the negative electrode can 20 and the positive electrode can 10. The base portions 31 sandwiched between the bottom portion 11 each function as a seal.

  The power generation element 40 includes a positive electrode material 41 in which a positive electrode active material or the like is formed into a disk shape, a negative electrode material 42 in which a metal lithium or a lithium alloy as a negative electrode active material is formed in a disk shape, and a nonwoven fabric separator 43. . As shown in FIG. 1, the positive electrode material 41 is positioned inside the positive electrode can 10, while the negative electrode material 42 is positioned inside the negative electrode can 20. A separator 43 is disposed between the positive electrode material 41 and the negative electrode material 42.

  The positive electrode material 41 contains manganese dioxide as a positive electrode active material. The positive electrode material 41 is formed as follows. First, graphite, tetrafluoroethylene-hexafluoropropylene copolymer and hydroxypropylcellulose are mixed with manganese dioxide to prepare a positive electrode mixture. Then, as will be described later, in a state where the columnar block member 45 made of the positive electrode mixture is disposed in the positive electrode ring 44, the positive electrode material 41 is formed in the positive electrode ring 44 by crushing the block member 45. The method of forming the positive electrode material 41 is not limited to the above, and any method may be used such as forming the positive electrode mixture by filling the positive electrode ring 44 into the positive electrode ring 44 and performing pressure molding, and then heating the molded member. The method may be used.

  A positive electrode ring 44 (pedestal) is attached to the positive electrode material 41 so as to hold the positive electrode material 41 so as to cover a part of the bottom surface and side surfaces of the positive electrode material 41. The positive ring 44 is made of stainless steel or the like having predetermined rigidity and conductivity. The positive electrode ring 44 includes a cylindrical side wall portion 44 a that contacts the side surface of the positive electrode material 41, and an annular flange that extends from one end side of the side wall portion 44 a toward the inside of the side wall portion 44 a and contacts the bottom surface of the positive electrode material 41. The part 44b is integrally formed. With the positive electrode ring 44 having such a configuration, the deformation of the positive electrode material 41 in the positive electrode ring 44 in the radial direction and one end side can be restricted. The positive electrode material 41 can freely expand to the other end side of the side wall portion 44a of the positive electrode ring 44 during discharge by providing a configuration in which the flange portion is not provided on the other end side of the side wall portion 44a of the positive electrode ring 44. Can do. Therefore, even when the thickness of the negative electrode material 42 is reduced during discharge, the positive electrode material 41 expands toward the negative electrode material 42 along the positive electrode ring 44, thereby preventing the positive electrode material 41 and the negative electrode material 42 from separating. it can.

  The positive electrode ring 44 is fixed to the bottom 11 of the positive electrode can 10 by welding or the like. Thereby, it can prevent that the positive electrode ring 44 leaves | separates from the bottom part 11 of the positive electrode can 10, and the positive electrode material 41 hold | maintained at this positive electrode ring 44 and the positive electrode can 10 can be made to contact more reliably. A detailed configuration of the positive electrode ring 44 will be described later.

  The separator 43 is configured using a non-woven fabric made of a polybutylene terephthalate fiber. The separator 43 is impregnated with a non-aqueous electrolyte in the flat battery 1. In addition, the thickness of the separator 43 is about 0.3-0.4 mm, for example.

The non-aqueous electrolyte is a solution in which LiClO ₄ is dissolved in a solution obtained by mixing propylene carbonate and 1,2-dimethoxyethane.

  The flat battery 1 having the above-described configuration is used as a power supply source of a tire pressure sensor for a vehicle, for example. This tire pressure sensor is installed in a tire, for example.

  When the flat battery 1 is used for such a tire pressure sensor, the flat battery 1 receives the impact received by the tire when the vehicle travels as it is. Therefore, the flat battery 1 receives a strong impact. Then, the positive electrode material 41 held by the positive electrode ring 44 in the flat battery 1 may be detached from the positive electrode ring 44. When the positive electrode material 41 is detached from the positive electrode ring 44, the contact between the positive electrode material 41 and the positive electrode can 10 becomes unstable, and the internal resistance of the flat battery 1 increases. Therefore, in this embodiment, the positive electrode ring 44 of the flat battery 1 is configured as follows.

  In the present embodiment, a tire pressure sensor is cited as an application example of the flat battery 1, but the flat battery 1 may be used as a power supply source for other devices.

(Configuration of positive ring)
A detailed configuration of the positive electrode ring 44 will be described below with reference to FIGS. 1 and 2.

  As shown in FIG. 1, the positive electrode ring 44 includes a cylindrical side wall portion 44 a and a flange portion 44 b extending inward from one end side of the side wall portion 44 a. The side wall portion 44a and the flange portion 44b are integrally formed. That is, the positive electrode ring 44 has a shape in which an opening is formed on the bottom surface of a bottomed cylindrical member. By making the positive electrode ring 44 into such a shape, the positive electrode material 41 can be held inside.

  The side wall portion 44 a of the positive electrode ring 44 is provided with a protruding portion 44 c (an engaging portion) that protrudes inward of the positive electrode ring 44 on the inner surface located on the inner side of the positive electrode ring 44. It is preferable to provide a plurality of protrusions 44c in the circumferential direction on the side wall 44a of the positive electrode ring 44 (six locations in the present embodiment), but only one may be provided on the side wall 44a. In addition, when providing the some protrusion part 44c in the side wall part 44a of the positive electrode ring 44, it is preferable to provide the protrusion part 44c uniformly in the circumferential direction of this side wall part 44a. Further, the side wall portion 44a of the positive electrode ring 44 may be crushed in the axial direction to form a protruding portion over the entire circumference on the inner peripheral surface of the side wall portion 44a.

  The protruding portion 44 c is formed by pushing a part of the side wall portion 44 a of the positive electrode ring 44 inward of the positive electrode ring 44. That is, in the case of this embodiment, the outer peripheral surface of the side wall 44a is pushed inward (in the thickness direction of the side wall 44a) in order to form the protruding portion 44c at six locations in the peripheral direction of the outer peripheral surface of the side wall 44a. A recessed portion 44d is formed.

  The concave portion 44d is formed, for example, by pressing the outer peripheral surface of the side wall portion 44a of the positive electrode ring 44 in the thickness direction of the side wall portion 44a in a state where a pin-shaped jig is inserted inside the positive electrode ring 44. Is done. As a result, a protruding portion 44 c that protrudes inward of the positive electrode ring 44 is formed on the side wall portion 44 a of the positive electrode ring 44. In addition, the hollow corresponding to the recessed part 44d may be formed in the outer surface of the said jig. Thereby, the concave portion 44 d can be easily formed in the side wall portion 44 a of the positive electrode ring 44.

  As shown in FIG. 3, the protrusion 44 c has a protrusion height when the cylindrical block member 45 is crushed in the positive ring 44 in the axial direction in the positive ring 44, as will be described later. It is formed so as to be smaller than the deformation amount of the radius (the deformation amount in the direction orthogonal to the axial direction). Note that the amount of deformation of the radius corresponds to the radial distance between the alternate long and short dash line and the solid line in FIG. 3, but FIG. 3 shows the side wall rather than the actual dimensional ratio in order to easily show the protrusion 44 c. The thickness of the portion 44a and the size of the protruding portion 44c are greatly illustrated.

  Here, when the positive electrode material 41 is mounted in the positive electrode ring 44, for example, the axial direction coincides with the height direction of the side wall portion 44 after the concave portion 44 d and the protruding portion 44 c are formed in the side wall portion 44 a of the positive electrode ring 44. Thus, the block member 45 is disposed in the positive electrode ring 44. Then, the positive electrode material 41 is mounted in the positive electrode ring 44 by crushing the block member 45 in the axial direction in the positive electrode ring 44. As described above, the protruding portion 44c provided on the side wall portion 44a of the positive electrode ring 44 is formed such that the protruding height is smaller than the deformation amount of the radius of the block member 45, whereby the protruding end portion of the protruding portion 44c. Can be prevented from interfering with the block member 45.

  Specifically, the protrusion 44 c preferably has a protrusion height of 0.5 to 5% with respect to the diameter of the block member 45. In addition, if it is a pellet-shaped block member which comprises a general positive electrode material, the deformation amount of the diameter at the time of crushing will be 0.5% or more. The upper limit of 5% is the ratio of the thickness dimension of a general positive electrode ring to the diameter of the block member.

  As described above, the block member 45 is disposed in the positive electrode ring 44 provided with the projecting portion 44c projecting inwardly on the side wall portion 44a, and the block member 45 is crushed, whereby the outer peripheral side of the positive electrode material 41 is obtained. Can bite into the protrusion 44c. Thereby, the positive electrode material 41 can be more reliably locked to the side wall portion 44 a of the positive electrode ring 44.

  Therefore, with the above-described configuration, even when a large impact is applied to the flat battery 1, the positive electrode material 41 can be more reliably held by the protruding portion 44 c provided on the side wall portion 44 a of the positive electrode ring 44. Therefore, when a large impact is applied to the flat battery 1, it can be prevented that the positive electrode material 41 is detached from the positive electrode ring 44 and the internal resistance of the flat battery 1 is increased.

(Effect of Embodiment 1)
As described above, according to this embodiment, since the projecting portion 44 c projecting inward is provided on the side wall portion 44 a of the positive electrode ring 44 that holds the positive electrode material 41, even when an impact is applied to the flat battery 1. The positive electrode material 41 can be prevented from coming off from the positive electrode ring 44. Thereby, an increase in the internal resistance of the flat battery 1 due to the positive electrode material 41 being detached from the positive electrode ring 44 can be prevented.

  The protruding portion 44c is formed by pressing the outer peripheral surface of the side wall portion 44a of the positive electrode ring 44 in the thickness direction of the side wall portion 44a to provide a concave portion 44d. Thereby, the protruding portion 44 c can be easily formed on the side wall portion 44 a of the positive electrode ring 44.

  Furthermore, the protrusion 44c has a protrusion height smaller than the deformation amount of the radius of the block member 45 to be crushed. Thereby, when the block member 45 is disposed in the positive electrode ring 44, it is possible to prevent the block member 45 and the protruding portion 44c from interfering with each other. Further, with the above-described configuration, the block member 45 can be crushed in the positive electrode ring 44 to form the positive electrode material 41, so that the protruding portion 44 c is bitten on the outer peripheral side of the positive electrode material 41. Is possible. Thereby, the positive electrode material 41 can be reliably locked by the side wall portion 44 a of the positive electrode ring 44.

[Embodiment 2]
In FIG. 4, the structure of the latching | locking part of the positive electrode ring 51 of the flat battery which concerns on Embodiment 2 of this invention is shown. The configuration of the second embodiment is different from the configuration of the first embodiment in that a recess 51b is provided on the inner peripheral surface of the positive electrode ring 51 of the flat battery. In the second embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and only different parts will be described below.

  Specifically, as shown in FIG. 4, the side wall 51 a of the positive ring 51 has a recess 51 b (locking portion) formed on the inner peripheral surface. As in the first embodiment, it is preferable to provide a plurality of recesses 51b (for example, six locations) at equal intervals in the circumferential direction on the inner peripheral surface of the side wall 51a. In this embodiment as well, like the first embodiment, only one recess 51b may be provided on the inner peripheral surface of the side wall 51a. Moreover, you may provide a recessed part over the inner peripheral surface whole periphery of the side wall part 51a.

  The above-described recess 51b is formed by pressing the inner peripheral surface of the side wall 51a of the positive electrode ring 51 in the thickness direction of the side wall 51a. Therefore, a protrusion 51c is formed on the outer peripheral surface of the side wall 51a. In addition, when providing a recessed part over the inner peripheral surface whole periphery of the side wall part 51a, you may crush the side wall part 51a of the positive electrode ring 51 in an axial direction.

  With the above-described configuration, as in the first embodiment, a cylindrical block member is disposed in the positive electrode ring 51, and the block member is crushed in the axial direction, whereby the concave portion 51a provided in the side wall portion 51a of the positive electrode ring 51. A part of the positive electrode material 52 is located inside. That is, in the positive electrode ring 51, the positive electrode material 52 having the protruding portion 52a is formed. The protruding portion 52 a is locked to the concave portion 51 b of the side wall portion 51 a of the positive electrode ring 51, so that the positive electrode material 52 is not easily detached from the positive electrode ring 51.

  In addition, in the above-described configuration, since the positive ring 51 does not have a portion protruding inward, it is possible to prevent the block member and the positive ring 51 from interfering when the block member is disposed in the positive ring 51. .

(Effect of Embodiment 2)
As described above, according to this embodiment, it is possible to prevent the positive electrode material 52 from coming off the positive electrode ring 51 even when an impact is applied to the flat battery, as in the first embodiment. Thereby, the increase in the internal resistance of the flat battery due to the positive electrode material 52 being detached from the positive electrode ring 51 can be prevented.

  Further, as in the present embodiment, the configuration having the concave portion 51b on the inner peripheral surface of the side wall portion 51a of the positive electrode ring 51 facilitates the arrangement of the block member in the positive electrode ring 51, and the positive electrode ring 51. The positive electrode material 52 can be easily mounted therein.

[Embodiment 3]
In FIG. 5, the structure of the latching | locking part of the positive electrode ring 61 of the flat battery which concerns on Embodiment 3 of this invention is shown. The configuration of the third embodiment differs from the configurations of the first and second embodiments described above in that an opening 61b is provided in the side wall portion 61a of the positive electrode ring 61. In the third embodiment, the same parts as those in the first and second embodiments are denoted by the same reference numerals, and only different parts will be described below.

  Specifically, as shown in FIG. 5, an opening 61 b (locking portion) is formed in the side wall portion 61 a of the positive electrode ring 61. It is preferable to provide a plurality (for example, six locations) of the openings 61b in the circumferential direction of the side wall 51a as in the first embodiment. In this embodiment as well, as in the first embodiment, only one opening 61b may be provided on the inner peripheral surface of the side wall 61a.

  By providing the opening 61b as described above in the side wall portion 61a of the positive electrode ring 61, when the block member is crushed in the positive electrode ring 61 to form the positive electrode material 62 as in the first embodiment, the opening portion is formed. A protrusion 62a of the positive electrode material 62 is formed in 61b. As a result, the protruding portion 62 a of the positive electrode material 61 is locked to the peripheral edge portion of the opening 61 b of the side wall portion 61 a of the positive electrode ring 61, and the positive electrode material 61 is unlikely to be detached from the positive electrode ring 61.

  Similarly to the above-described embodiment 2, in the above-described configuration, the positive ring 61 has no portion projecting inward, and therefore when the block member is disposed in the positive ring 61, the positive ring 61 and the block member Can be prevented from interfering.

  In addition, you may form the opening part 61b by providing a notch in a part of side wall part 61a, and bending outward.

(Effect of Embodiment 3)
As described above, according to this embodiment, the positive electrode material 62 can be prevented from coming off from the positive electrode ring 61 even when an impact is applied to the flat battery as in the first and second embodiments. Thereby, an increase in the internal resistance of the flat battery due to the positive electrode material 62 being detached from the positive electrode ring 61 can be prevented.

  In addition, as in the present embodiment, the configuration in which the side wall 61a of the positive electrode ring 61 has the opening 61b facilitates the arrangement of the block member in the positive electrode ring 61, and the positive electrode ring 61 has the positive electrode in the positive electrode ring 61. The material 62 can be easily formed.

[Embodiment 4]
In FIG. 6, the structure of the latching | locking part of the positive electrode ring 71 of the flat battery which concerns on Embodiment 4 of this invention is shown. The configuration of the fourth embodiment is different from the configurations of the first to third embodiments in that a part of the side wall 71a of the positive electrode ring 71 is bent inward and protrudes. In this Embodiment 4, the same code | symbol is attached | subjected to the part same as the structure of Embodiment 1-3, and only a different part is demonstrated below.

  Specifically, as shown in FIG. 6, the side wall 71 a of the positive electrode ring 71 is formed with a protrusion 71 b (locking portion) in which a part of the side wall 71 a protrudes inward of the positive electrode ring 71. ing. This protrusion 71b is formed by providing a cut in a part of the side wall 71a and bending it inward. Therefore, an opening 71c (locking portion) is formed in a portion of the side wall portion 71a that is bent to become the protruding portion 71b. It is preferable to provide a plurality (for example, six places) of the protrusions 71b and the openings 71c in the circumferential direction on the side wall 71a as in the first embodiment. In this embodiment as well, as in the first embodiment, one protrusion 71b and one opening 71c may be provided on the side wall 71a.

  When the protruding portion 71b and the opening 71c as described above are provided on the side wall portion 71a of the positive electrode ring 71, the block member is crushed in the positive electrode ring 71 to form the positive electrode material 72 as in the first embodiment. In addition, the protruding portion 71b bites into the outer peripheral side of the positive electrode material 72, and the protruding portion 72a of the positive electrode material 72 is formed in the opening 71c. As a result, the positive electrode material 72 has its outer peripheral side locked by the protruding portion 71 b, and the protruding portion 72 a is locked by the peripheral portion of the opening 71 c of the side wall portion 71 a of the positive electrode ring 71. Accordingly, the positive electrode material 72 is less likely to be detached from the positive electrode ring 71 more reliably.

(Effect of Embodiment 4)
As described above, according to this embodiment, even when an impact is applied to the flat battery, the positive electrode material 72 is prevented from being detached from the positive electrode ring 71 by the protruding portion 71b of the positive electrode ring 71 and the protruding portion 72a of the positive electrode material 72. It can be surely prevented. Thereby, the increase in the internal resistance of the flat battery due to the positive electrode material 72 being detached from the positive electrode ring 71 can be prevented more reliably.

[Embodiment 5]
FIG. 7 shows a schematic configuration of a flat battery according to Embodiment 5 of the present invention. The configuration of the fifth embodiment is different from the configuration of the first embodiment described above in that a part of the positive electrode ring 81 is sandwiched between the gasket 30 and the positive electrode can 10. In the fifth embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and only different parts will be described below.

  Specifically, the positive electrode ring 81 has a flange portion 81b that protrudes radially outward from one end side of the cylindrical side wall portion 81a. The flange portion 81b has a substantially circular outer shape in plan view so as to protrude radially outward from the entire circumference of the side wall portion 81a.

  The outer peripheral side portion of the flange portion 81 b is sandwiched between the base portion 31 of the gasket 30 and the bottom portion 11 of the positive electrode can 10. That is, when the peripheral wall portion 12 of the positive electrode can 10 and the peripheral wall portion 22 of the negative electrode can 20 are caulked and fixed, the outer peripheral side of the flange portion 81 b of the positive electrode ring 81 is also fixed together. Thereby, the positive electrode ring 81 can be fixed to the positive electrode can 10 and the negative electrode can 20.

  Similarly to the first embodiment, the positive electrode ring 81 configured as described above is provided with a protruding portion 81c (locking portion) that protrudes inward of the positive electrode ring 81 on the inner peripheral surface of the side wall portion 81a. . Since the description regarding this protrusion part 81c is the same as that of the above-mentioned embodiment, detailed description is abbreviate | omitted. In the present embodiment, the protruding portion 81c similar to that of the first embodiment is provided on the side wall 81a of the positive electrode ring 81. However, the present invention is not limited to this, and the configurations of the above-described second to fourth embodiments may be applied. Good.

(Effect of Embodiment 5)
As described above, according to this embodiment, the flange portion 81 b of the positive electrode ring 81 is provided so as to protrude outward in the radial direction, and is sandwiched between the gasket 30 and the bottom portion 11 of the positive electrode can 10. Thereby, the positive electrode ring 81 can be fixed to the positive electrode can 10 without using welding. Even in such a configuration, the same effects as those of the first embodiment can be obtained by providing the protrusions 81 c similar to those of the first embodiment.

(Other embodiments)
While the embodiments of the present invention have been described above, the above-described embodiments are merely examples for carrying out the present invention. Therefore, the present invention is not limited to the above-described embodiment, and can be implemented by appropriately modifying the above-described embodiment without departing from the spirit thereof.

  In the first embodiment, the concave portion 44d is formed by pressing the outer peripheral surface of the side wall portion 44a of the positive electrode ring 44, thereby forming the protruding portion 44c that protrudes inward from the inner peripheral surface of the side wall portion 44a. ing. However, you may form only the protrusion part 44c which protrudes inward from the internal peripheral surface of the side wall part 44a, without forming the recessed part 44d.

  In the said Embodiment 1, 2, the protrusion part 44c or the recessed part 51b is formed in the internal peripheral surface of the side wall parts 44a and 51a of the positive electrode rings 44 and 51. FIG. However, unevenness may be provided on the inner peripheral surface of the side wall portion of the positive electrode ring, or the surface roughness of the side wall portion may be made rough enough to hold the positive electrode material 41 by making the unevenness fine. When unevenness is formed on the inner peripheral surface of the side wall portion of the positive electrode ring, the unevenness corresponds to the locking portion. Moreover, when making the surface roughness of a side wall part into the roughness which can hold | maintain the positive electrode material 41, the internal peripheral surface of the side wall part which has the said surface roughness respond | corresponds to a latching | locking part.

  In each of the above embodiments, the positive electrode can 10 and the negative electrode can 20 are each formed in a bottomed cylindrical shape, and the side wall portions 44a, 51a, 61a, 71a, 81a of the positive electrode rings 44, 51, 61, 71, 81 are cylindrical. Is formed. However, the positive electrode can and the negative electrode can may be formed in a bottomed cylindrical shape other than the bottomed cylindrical shape, and the side wall portion of the positive electrode ring may be formed in a cylindrical shape other than the cylindrical shape.

  In each of the embodiments described above, the protruding portions 44c, 71b, 81c, the recess 51b, and the openings 61b, 71c are formed on the side walls 44a, 51a, 61a, 71a, 81a as examples of the locking portions. However, any configuration may be used as long as the positive electrode material can be locked to the side wall portion.

  In each of the above embodiments, a material containing manganese dioxide is used as the positive electrode active material of the positive electrode material 41, and metallic lithium or a lithium alloy is used as the negative electrode active material of the negative electrode material 42. However, any other material that functions as a positive electrode active material or a negative electrode active material may be used as the positive electrode material 41 and the negative electrode material 42.

  In each of the above embodiments, the positive electrode can 10 is used as an outer can and the negative electrode can 20 is used as a sealed can. Conversely, the positive electrode can may be a sealed can and the negative electrode can may be an outer can. In this case, since the arrangement of the positive electrode material and the negative electrode material is reversed, the negative electrode ring holding the negative electrode material is fixed to the negative electrode can which is an outer can.

  The flat battery according to the present invention can be used as a battery for equipment used in an environment subject to strong impact, such as a tire pressure sensor.

1: flat battery, 10: positive electrode can (exterior can), 20: negative electrode can (sealing can), 40: power generation element, 41, 52, 62, 72: positive electrode material, 42: negative electrode material, 44, 51, 61 , 71, 81: Positive electrode ring (pedestal), 44a, 51a, 61a, 71a, 81a: Side wall portion, 44c, 71b, 81c: Projection portion (locking portion), 45: Block member, 51b: Recessed portion (locking portion) ), 61b, 71c: Opening portion (locking portion)

Claims (5)

A bottomed cylindrical outer can,
A sealing can arranged to cover the opening of the outer can;
A positive electrode material and a negative electrode material disposed between the outer can and the sealing can;
A pedestal fixed on the inner surface of the outer can while holding any one member of the positive electrode material and the negative electrode material,
The pedestal has a side wall covering a part of the one member,
A flat battery, wherein the side wall is provided with at least one engaging portion for holding the one member. The flat battery according to claim 1,
The locking portion is composed of at least one of a protruding portion and a recessed portion provided on the surface on the pedestal inward side of the side wall portion of the pedestal,
The one member is a flat battery arranged in the pedestal so as to engage with the engaging portion on the outer peripheral side thereof. The flat battery according to claim 2,
The locking portion is a flat battery formed by deforming a side wall portion of the pedestal in a thickness direction thereof. The flat battery according to claim 2 or 3,
The one member is formed by crushing a columnar block member extending in the axial direction in the axial direction in a state where the block is disposed in the pedestal so that the axial direction coincides with the height direction of the side wall of the pedestal. Mounted in the pedestal,
The projecting portion is a flat battery in which a projecting height is smaller than a deformation amount of the block member in a direction perpendicular to the axial direction when the block member is crushed. The flat battery according to claim 1,
The locking portion is constituted by an opening provided in a side wall portion of the pedestal,
The one member arranged in the pedestal is a flat battery, a part of which is located in the opening.

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