JP2003317690A - Battery holder for button type battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize a further low height and improve molding performance in a battery holder that is mounted on a substrate. <P>SOLUTION: The battery holder comprises a housing 2, a contact 28, and a contact 50. A housing section 22 which penetrates vertically is formed in the housing 2 and a bottom wall is not formed, and an opening 9 is formed. The battery is housed in the housing section 22 and supported by the battery holder 1 by a pawl 38 of the contact 28 and a protrusion 26 of the housing section 22, and is electrically connected to a spring member 30 of the contact 28 and a contact piece 54 of the contact 50. Since there is no bottom wall and an opening penetrated in vertical direction is formed, the battery holder 1 becomes low height and molding performance is improved as there is no thin bottom wall. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery holder for button type batteries, and more particularly to a battery holder for button type batteries used in small electronic devices such as mobile phones, game machines and personal digital assistants.

[0002]

2. Description of the Related Art A battery holder for button type batteries of this type is
For example, it is used by being mounted on a printed circuit board (hereinafter, simply referred to as a board) arranged in a small device such as a mobile phone. Generally, the space inside the device in which such a battery holder is mounted is very small. Therefore, it is required that the height of protrusion on the board when mounted on the board be as low as possible.

As an example of such a battery holder, the battery holder disclosed in Japanese Patent Application Laid-Open No. 10-188932 is known. This battery holder has a housing for receiving a coin-type battery, that is, a button-type battery, and a contact that contacts one side surface of the button-type battery that serves as one electrode and a main surface of the button-type battery that serves as the other electrode. It has other contacts to contact. Then, a bottom wall is formed in the accommodation portion to receive the button type battery when the button type battery is mounted. The battery is held in the accommodating portion by the holding claws at the tip of the resin arm integrally formed with the mounting portion of the holder and the bottom wall of the battery holder.

As another conventional technique, Japanese Patent Laid-Open No. 2000-2000
A button type battery holder disclosed in Japanese Patent Publication No. 164188 is known. The battery holder has a battery accommodating portion for accommodating a battery, and latches are provided at a plurality of locations along the inner circumference of the battery accommodating portion. The latch is configured to engage a major surface of the battery that is exposed to the outside when placed in the housing, and is configured to cooperate with the bottom wall of the housing to hold the battery.

[0005]

In both of the above-mentioned prior arts, the battery holder is latched at the upper part of the holder, and the bottom wall of the battery accommodating part is thinned at the bottom part of the holder to form a low-profile battery holder. . However, the thinner the bottom wall,
At the time of molding, it becomes difficult for the resin to flow into the thinned bottom wall portion, so the moldability deteriorates. Therefore, a certain thickness or more of the bottom wall is required, and there is a limit to making the bottom wall thin and reducing its height.

The present invention has been made in view of the above points, and is capable of further reducing the height, has a good material flow during resin molding, and has excellent moldability, and is a battery holder for button type batteries. The purpose is to provide.

[0007]

A button-type battery holder for a button-type battery according to the present invention has a first contacting side surface of a button-type battery having a side surface serving as one electrode and a main surface serving as the other electrode.
A battery holder for a button type battery, comprising a contact, a second contact that contacts the main surface, and an insulating housing that has a housing portion that houses the button battery and that holds the first and second contacts. The second contact is arranged at a position corresponding to the main surface of the accommodating portion, and an opening penetrating in the vertical direction is formed at the position.

It is preferable that the side wall of the accommodating portion is formed with a convex portion capable of supporting the button type battery when the button type battery is accommodated in the accommodating portion first from the main surface. This convex portion may be formed in an annular shape along the inner circumference of the accommodating portion, or a plurality of convex portions may be projected discretely.

Further, it is preferable that the second contact has a contact piece arranged point-symmetrically in plan view with respect to the center of the main surface of the button type battery. The "point symmetry" includes not only strict point symmetry but also a case where the symmetry relationship is slightly deviated.

Further, at least one first contact has a claw extending along the other main surface on the other main surface of the button type battery, and the claw for holding the button type battery accommodated by the claw is retained. Is preferably configured to.

Further, the second contact has a flat plate-shaped base portion exposed in the opening, and the base portion can be configured to support the main surface of the button type battery. Further, the base may be provided with a plurality of protrusions for receiving the main surface of the button type battery and having a height lower than that of the contact piece.

Further, the button type battery has a curved surface on the side surface in the vicinity of the main surface serving as an electrode, and the convex portion of the side wall of the accommodating portion receives the button type battery with the main surface facing downward, It is preferable to have a complementary curved receiving surface that supports the curved surface of the button battery from below.

[0013]

The battery holder for button type batteries of the present invention is
Since the second contact is arranged at a position corresponding to the main surface of the button-shaped battery in the accommodating portion of the insulating housing, and the opening penetrating in the vertical direction is formed at this position, the following effect is obtained.

That is, since there is no bottom wall, there is no risk of interfering with the main surface of the button type battery, and the height can be reduced. Further, since there is no thin bottom wall, the flow of the material at the time of resin molding is improved, and a battery holder for button type batteries having excellent moldability can be obtained.

If a convex portion capable of supporting the button-type battery is formed on the side wall of the accommodating portion when the button-type battery is accommodated in the accommodating portion first from the main surface, the button-shaped battery is formed by this convex portion. The battery can be reliably supported.

Further, when the second contact has a contact piece arranged in point symmetry in plan view with respect to the center of the main surface of the button type battery, the second contact contacts the button type battery at a plurality of locations. Therefore, the electrical connection is highly reliable. Further, the suction surface can be arranged at the center of the second contact.

Further, at least one first contact has a claw extending along the other major surface on the other major surface of the button battery, and the claw accommodated in the button battery by the claw. In the case where the claw is configured to be prevented from coming off, since the claw is made of metal, deterioration of the material due to heat during surface mounting does not occur. Therefore, the reliability of holding the button type battery is improved.

Further, when the second contact has a flat plate-like base portion exposed at the opening and is configured to support the main surface of the button-type battery by this base portion, further reduction in height is achieved. Is possible.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of a battery holder for button type batteries (hereinafter, simply referred to as a battery holder) of the present invention will be described in detail below with reference to the accompanying drawings. 1 shows a first embodiment of a battery holder of the present invention, FIG. 1 (a) is a plan view, and FIG. 1 (b) is 1b of FIG.
It is sectional drawing which follows the -1b line. 2A and 2B are perspective views of the battery holder shown in FIG. 1. FIG. 2A is a perspective view seen from above, and FIG. 2B is a perspective view seen from below. Hereinafter, description will be made with reference to FIGS. 1 and 2.

The battery holder 1 includes an insulating housing (hereinafter,
2). Housing 2
It is configured by integrally molding an insulating resin with a mold.
The housing 2 is a substantially rectangular parallelepiped, and has a mounting portion 4 having through grooves 6 for mounting contacts, which will be described later, at the four corners.
Are formed. A notch 10 is formed in each side wall 8 along the longitudinal direction of the housing 2. In addition, a mounting portion 1 for mounting a contact (first contact) 28, which will be described later, at the center of both ends in the longitudinal direction of the housing 2.
2 is formed.

A substrate 90 (FIG. 1B) is attached to the mounting portion 12.
A mounting groove 14 that is perpendicular to the housing 2 penetrates from the bottom surface 16 side of the housing 2 to the top surface 20 side. The mounting groove 14 is also
It has a slot shape extending in a direction orthogonal to the longitudinal direction of the housing 2. The upper surface 18 of the mounting portion 12 is formed in a step portion that is lowered from the upper surface 20 (FIG. 1B) of the housing 2 toward the substrate 90. A button type battery (hereinafter simply referred to as a battery) 80 is provided at the center of the housing 2.
A circular accommodating portion 22 for accommodating (FIG. 3) is formed. An annular convex portion 26 having a curved receiving surface 26 a matching the outer diameter shape of the battery 80 is formed on the lower portion of the side wall 24 of the housing portion 22. The accommodating portion 22 is a generally circular through hole that penetrates from the upper surface 20 of the housing 2 to the bottom surface 16, and has a circular opening that penetrates in the up-down direction and has a diameter slightly larger than the main surface 86 of the battery 80 described below. 9 is formed. The inserted battery 80 is configured to be supported by the convex portion 26, the details of which will be described later.

Next, the contact will be described with reference to FIG. 3 shows a state in which the battery 80 is attached to the battery holder 1, FIG. 3 (a) is a perspective view seen from above, and FIG. 3 (b) is along the line 3b-3b in FIG. 3 (a). FIG. The contact piece 54 is shown in a free state with no load. The contact (first contact) 28 is formed by stamping and bending a single metal plate, and is arranged along a side surface 82 (FIG. 3) that serves as one electrode of the battery 80, and the curved portion 32. And a fixing portion 34 that is bent into an inverted U shape. Two same contacts 28 are used.

The tip portion of the fixing portion 34 is formed as a tine portion 36 that is bent in parallel with the substrate 90, and protrudes outside the fixing portion 34 so that it can be soldered onto the substrate 90. The tip of the spring piece 30 is located on the upper surface 2 of the housing 2.
At a position not higher than 0, the claw 38 is formed on the accommodation portion 22 side substantially parallel to the substrate 90, that is, substantially parallel to the upper main surface 84 of the battery 80, and extends along the main surface 84. The tip 40 of the claw 38 is formed to have a curved surface that matches the inner diameter of the housing portion 22, that is, the outer shape of the battery 80. The curved portion 32 of the spring piece 30 is the bottom surface 1 of the housing 2.
6, the spring piece 30 is located near the housing 2.
A height substantially equal to the height and sufficient elasticity can be obtained.

A pair of blades 42 (FIG. 1A) project in opposite directions in the main surface of the material of the contact 28 at a position of each of the inverted U-shaped fixing portions 34 corresponding to the mounting groove 14. It is set up.
Then, the fixing portion 34 is put on the mounting portion 12 of the housing 2 so as to be pressed from above, and is mounted on the mounting portion 12 of the housing 2. At this time, the blade 42 is press-fitted into the mounting groove 14 and the contact 28 is fixed to the mounting portion 12. Since a barb (not shown) is formed on the blade 42, it is securely fixed by interfering engagement with the mounting portion 12. Further, a space 44 that penetrates vertically and communicates with the mounting groove 14 is formed in a portion of the mounting portion 12 corresponding to the spring piece 30, and the spring piece 30 of the contact 28 is configured to be housed in the space 44. ing. Therefore, when the contact 28 is attached to the attachment portion 12, the spring piece 3 is
0 can be bent in the space 44 so as to be able to come into contact with and separate from the accommodation portion 22.

Then, as shown in FIG. 3, when the battery 80 is mounted in the accommodating portion 22, the pair of claws 38 cooperate with each other to bring the upper main surface 84 of the battery 80 into contact with one side of the battery 80. The battery 80 is pushed down from the side surface 82 side serving as the electrode of
Stop getting out of 2. On the other hand, the battery 80 is on the side of the bottom surface 16 of the housing 2 and has the curved receiving surface 2 of the convex portion 26.
It is supported by 6a. In FIG. 3, the battery 80 has one electrode formed from the side surface 82 to the upper main surface 84. The spring piece 30 contacts this side surface 82.

Next, the contact (second contact) 50 in contact with the other electrode, that is, the main surface 86 will be described with reference to FIGS. 1 to 3. The contact 50 is
A plate-shaped base portion 52 formed by punching and bending from a single metal plate, a contact piece 54 cut and raised in a substantially central portion of the base portion 52, and 4 for attaching to the housing 2.
And one fixing piece 56. The contact 50 has a total length longer than the longitudinal dimension of the housing 2 and a width shorter than the width of the housing 2.

The contact 50 is formed on the bottom surface 1 of the housing 2.
A recess 58 formed in 6 and wider than the contact 50
(FIG. 2B). A notch 60 (FIG. 2B) is formed at the center of both ends of the contact 50 in the longitudinal direction.
Two tines 62 to be soldered to the substrate 90 are formed. Then, the fixing piece 56 is provided in the vicinity of the tine portion 62 so as to project at a position corresponding to the through groove 6. The tine portion 62 has a recess 62 a formed by stamping the tine portion 62 so as to be separated from the substrate 90. This recess 62
Due to a, a gap is formed between the substrate 90 and the substrate 90, and when the battery holder 1 is soldered to the substrate 90, solder and solder flux are prevented from entering the housing 2 or the contact piece 54.

The contact piece 54 is formed along the longitudinal direction of the contact 50 and at a position displaced from an unillustrated axis extending in the longitudinal direction through the center of the contact 50. Due to this displacement, a large area 52a and a small area 52b are formed in the center of the base 52 (FIG. 1A).
When mounting the assembled battery holder 1 on the substrate 90,
The vacuum suction part of the robot arm for assembly (not shown)
The battery holder 1 is sucked up by coming into contact with the large area 52a,
Transfer to a predetermined position. That is, the large area 52a functions as a suction surface on which the assembling robot arm sucks.

The contact piece 54 is formed by punching out a cantilever shape from the slot 64 along the longitudinal direction of the contact 50. The battery 8 is attached to the tip of the contact piece 54.
A contact 66 (FIG. 3B) that contacts 0 is formed by stamping. As best shown in FIG. 3B, the contact piece 54 is provided obliquely toward the main surface 86 of the battery 80 so as to apply a load when contacting the battery 80.
When 0 is mounted, the contact 66 contacts the main surface 86 of the battery 80.

In the mounting position of the battery 80 shown in FIG. 3, the battery 80 is prevented from moving upward by the claw 38 of the spring piece 30, and the curved surface 88 along the circumferential direction near the main surface 86 of the battery 80. (FIG. 3B) is held in contact with the curved receiving surface 26a. At this time, since there is no bottom wall of the housing 2 facing the main surface 86, the dimension of the housing 2 in the height direction can be reduced until the main surface 86 is sufficiently close to the contact 50. In the conventional case where the bottom wall is provided, in order to make the height of the battery holder low, it is necessary to reduce the thickness of the bottom wall, but considering the fluidity of the material at the time of molding, the thickness is constant. It is difficult to make it thinner than the limit. On the other hand, since the battery holder 1 does not have a bottom wall, the height can be reduced, and since it is not necessary to form a thin bottom wall, resin molding can be easily performed. Figure 3
In (b), the main surface 86 of the battery 80 is located in the opening 9,
The state in which the opening 9 receives the main surface 86 is clearly shown.

Further, since the battery 80 is held by the claws 38 of the metal contacts 28, it is not affected by heat during soldering. In other words, when the battery 80 is supported by the resin portion, the resin material may deteriorate due to heat and the holding power may decrease, but there is no such concern. Therefore,
It is suitable for soldering using a lead-free solder material (having a high melting point) in consideration of the influence on the environment.

The battery 8 mounted as shown in FIG.
To remove 0, insert a tool (not shown) such as a screwdriver from the notch 10 of the housing 2,
It is done by twisting. In addition, the above-mentioned convex portion 26,
Not only does the battery 80 support the battery 80,
Inside the contact 50, the side surface 82 that becomes an electrode is inclined.
It also has a function of preventing a short circuit by coming into contact with the base portion 52 of the. In the present embodiment, the convex portion 26 is formed in an annular shape along the inner circumference of the accommodation portion 22, but a plurality of convex portions 26 may be formed discretely.

Further, in order to hold the battery 80, the claw 38
A pair of contacts 28 having a pair of contacts 28 are arranged to face each other.
It is also possible to replace it with a part of. That is, the battery 80 may be attached by projecting a part of the housing 2 onto the main surface 84 and hooking the main surface 84 on the projecting portion.

Next, regarding the second embodiment of the present invention,
This will be described with reference to FIGS. 4 and 5. FIG. 4A is a plan view of the battery holder 100 according to the second embodiment, and FIG.
Is a cross-sectional view taken along line 4b-4b in FIG.
4A is a perspective view of the battery holder 100 shown in FIG. 4 viewed from above, and FIG. 5B is a perspective view viewed from below. Hereinafter, description will be given with reference to FIGS. 4 and 5. In the description, the same parts will be described with the same reference numerals.

In the second embodiment, the housing 2
As the contact 28, the same one as in the first embodiment is used. The contact (second contact) 150 is
It is formed by punching and bending as in the first embodiment, except that it has two contacts 166. Two contact pieces 154 of the contact 150 are formed in the center of the contact 150. That is, the contact pieces 154 are point-symmetric with respect to the center of the base portion 152 of the contact 150 and are arc-shaped outwardly from positions separated from each other along an axis passing through the center and extending along the longitudinal direction of the contact 150. It is formed so as to extend in the opposite direction. A contact point 166 similar to the contact 50 is formed at the tip of each contact piece 154.

In the case of the contact 150, a center area 170 is defined by an arcuate slot 164 formed in the center between the contact piece 154 and the center area 170, which serves as a suction surface of the assembly robot. . Battery 80
When the battery is inserted, the battery 80 is held in the same manner as that shown in FIG. 3 described above, and a detailed description thereof will be omitted here. In this second embodiment, the contacts 166 are
Since the two cells are arranged symmetrically with respect to the center of 0, the stability of the battery 80 at the time of contact is improved and the reliability of contact is improved by the two-point contact. Further, since the suction surface can be arranged at the center (center of gravity), the suction work can be stably performed. The number of contact pieces 154 may be three or more.
Further, in this embodiment, the tine portion 162 of the contact 150 is formed at two locations on one side in the longitudinal direction, but is not formed on the opposite side. This tine 16
Various modes can be considered for No. 2 depending on the application and the circuit (not shown) design of the substrate 90.

Next, a third embodiment of the battery holder of the present invention will be described with reference to FIG. FIG. 6 shows the battery holder 200 of the third embodiment, FIG. 6 (a) is a plan view, and FIG. 6 (b) is a perspective view seen from above.
Hereinafter, description will be given with reference to FIGS.

The battery holder 200 has a contact (first contact) 228 similar to those of the first and second embodiments.
And a contact (second contact) 250 similar to the second embodiment and two housing halves 202a, 202.
and a housing 202 composed of b. The contact 228 is different from the contact 28 in that the tine portion 236 is formed larger than the contact 28, that is, the contact 228 is formed longer in the longitudinal direction. The claw 238 is
It is similar to the contact 28 of the first embodiment.
The contact 250 has a flat plate-shaped base portion 252 punched out from a single metal plate, and has notches 2 similar to the notch 60 of the second embodiment at both ends in the longitudinal direction of the base portion 252.
60 is formed, whereby four tine parts 262 are formed.

The center portion of the contact 250 is formed in a disc shape, and a contact piece 254 cut and raised by the slot 264 is formed in the disc portion. A contact 266 is formed at the tip of each of the contact pieces 254.
The contact piece 254 is formed in a shape that extends in a point-symmetrical arc shape similar to that of the second embodiment, except that the base portion 252 also extends outside the contact piece 254. Also,
A fixing piece 256, which is similar to the fixing piece 56 of the first embodiment, is projectingly provided on these base portions 252. The aforementioned disk-shaped portion imparts rigidity to the contacts 250 so as to resist an external force that causes bending or twisting of the battery holder 200 after the battery holder 200 is assembled.

Since the same housing halves 202a and 202b are used with their left and right sides turned, only one housing half 202a will be described. Housing half 20
2a has a side wall 224 complementary to the side surface 82 (FIG. 3B) of the battery 80, and large and small spaces 244 and 274 are formed on both sides along the longitudinal direction of the contact 250. The mounting portion 21 is provided between these spaces 244, 274.
2 is formed, and the fixed portion 234 of the contact 228 is attached to the attachment portion 212. And contact 228
The spring piece 230 of the contact 250 in the space 244
It becomes possible to elastically bend along the longitudinal direction. Further, the side wall 224 is formed with a convex portion 226 having a curved receiving surface 226a having the same function as that of the first embodiment.

Further, at both ends of the housing half 202a, a through groove 206 into which the fixing piece 256 of the contact 250 is inserted is formed. Housing half 20
When the 2a and 202b are assembled to the contact 250, the housing 22 that receives the battery 80 by the four sidewalls 224 is formed.
2 is configured. The battery 80 is attached to the bottom of the housing 222.
209 that penetrates in the vertical direction and serves as a relief for the main surface 86 of the
Are formed.

In the third embodiment, the widths of the housing halves 202a and 202b, that is, the outer dimensions in the direction orthogonal to the longitudinal direction of the contact 250 are set to be approximately the same as the diameter of the disc-shaped portion of the contact 250. Is important. As a result, the width dimension of the battery holder 200 can be made extremely small. As a result, the battery holder 20
The width of 0 can be made smaller than the diameter of the battery 80 to be mounted, and the limited mounting area on the substrate 90 can be reduced. The suction surface of the assembly robot is the center area 270 of the base 252.

Next, a fourth embodiment of the present invention will be described with reference to FIG. 7: shows the battery holder 300 of 4th Embodiment, FIG.7 (a) is the perspective view which looked at the battery holder from the upper part, FIG.7 (b) is 7b- of FIG.7 (a).
Sectional views along line 7b are shown, respectively. The feature of the fourth embodiment is that the housing 302 has a housing portion 322 having a different shape from the housing portion 22 of the housing 2 shown in FIG. That is, the side wall 324 of the accommodating portion 322 is not formed with a protrusion such as the protrusion 26 of the first embodiment. An opening 309 formed in the bottom of the housing 302
Has the same diameter as the upper surface 320 side of the housing 302. As the contact, a contact 350 that is slightly different from the contact 28 of the first embodiment and the contact 150 of the second embodiment is used. With this configuration, the battery 8
As shown in FIG. 7B, 0 has a structure in which the main surface 86 of the battery 80 is directly supported by the base portion 352 of the contact (second contact) 350.

In this case, the base 352 of the contact 350
A plurality of minute protrusions 372 are provided on the
At 2, the main surface 86 of the battery 80 is received. The height of the minute protrusion 372 is set to be considerably lower than the height of the contact piece 354 in order to apply a predetermined contact pressure to the contact piece 354 when it comes into contact with the battery 80. It should be noted that, if a plurality of minute protrusions 372 are arranged symmetrically about point symmetry, the main surface 86 of the battery 80 can be stably received. In the fourth embodiment, the height of the battery holder 300 is set to the height of the battery 80, that is, 2.15.
Since the height is 2.2 mm to the thickness of the contacts 28 and 350 added, the ultimate low-profile structure is achieved.

Although the contact is press-fitted into the housing in the above embodiment, it may be insert-molded in the housing.

[Brief description of drawings]

1A and 1B show a first embodiment of a button-type battery holder of the present invention, in which FIG. 1A is a plan view of the battery holder, and FIG.
2 is a sectional view taken along the line 1b-1b in FIG.

2A and 2B are perspective views of the button-type battery holder shown in FIG. 1, where FIG. 2A is a perspective view seen from above and FIG. 2B is a perspective view seen from below.

FIG. 3 shows a state in which a button-type battery is mounted in a button-type battery holder, (a) is a perspective view seen from above,
3B is a sectional view taken along the line 3b-3b in FIG.

FIG. 4 shows a second embodiment of the button-type battery holder of the present invention, (a) is a plan view of the battery holder, and (b) is a plan view of the battery holder.
Shows a sectional view taken along line 4b-4b of FIG.

5 (a) is a perspective view of the button-type battery holder of FIG. 4 seen from above, and FIG. 5 (b) is a perspective view seen from below.

FIG. 6 shows a third embodiment of the button-type battery holder of the present invention, in which (a) is a plan view of the battery holder and (b) is a plan view of the battery holder.
Shows perspective views seen from above.

FIG. 7 shows a battery holder according to a fourth embodiment of the present invention,
(A) is a perspective view of the battery holder as seen from above, (b)
Shows a cross-sectional view taken along line 7b-7b of FIG. 7 (a).

[Explanation of symbols]

1, 100, 200, 300 Battery holder 2,202,302 Insulated housing 9, 209, 309 openings 22, 222, 322 accommodation section 24, 224, 324 Side wall 26, 226 convex 28,228 First contact 38,238 nails 50, 150, 250, 350 Second contact 52, 152, 252, 352 Base 80 button type battery 82 side 86 main surface 154, 254, 354 Contact piece

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kahoru Tanaka             3-5-8 Kumamoto, Takatsu-ku, Kawasaki City, Kanagawa Prefecture               Tyco Electronics Amplifier Stock             In the company F-term (reference) 5H040 AA01 AA07 AS13 AS14 AT03                       AY03 CC16 CC17 CC23 CC25                       DD02

Claims (5)

[Claims] 1. A button-type battery having a side surface serving as one electrode and a main surface serving as the other electrode, a first contact in contact with the side surface, a second contact in contact with the main surface, and the button-type battery. In a battery holder for a button-type battery, which has an accommodating part for accommodating the first contact and an insulating housing for retaining the first and second contacts, the accommodating part of the insulating housing is provided at a position corresponding to the main surface. A battery holder for a button type battery, wherein a second contact is arranged and an opening penetrating in the vertical direction is formed at the position. 2. A convex portion capable of supporting the button type battery when the button type battery is accommodated in the containing portion first from the main surface is formed on a side wall of the containing portion. The battery holder for a button battery according to claim 1. 3. The second contact comprises a contact piece arranged point-symmetrically in plan view with respect to the center of the main surface of the button type battery. Battery holder for the button battery described above. 4. At least one of the first contacts has a claw extending along the other major surface of the button-shaped battery on the other major surface thereof, and the button-shaped received by the claw. The button-type battery holder according to any one of claims 1 to 3, wherein the battery holder is configured to prevent the battery from being removed. 5. The second contact has a flat plate-shaped base exposed in the opening, and the base is configured to support the main surface of the button-type battery. The battery holder for the button battery according to 1.