JP2001023593A - Coin or button battery and holder therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery holder having a reduced load on environments and a minimum size, capable of stably holding a battery, and suitable for reflow soldering. SOLUTION: This holder is formed of metal, an outer wall 9 also serving as a positive-electrode current collector is shaped into a polygon and disposed on a substrate, projections 3a, 3b, 3c, 3d for soldering are provided on one end part of the outer wall 9 and within a space shaped into a square 5 circumscribing the outer wall 9, a projection 2 for pressing a battery 6 is provided on the other end part of the outer wall 9, and a pair of projections 1a, 1b are provided on end parts on the side opposite to the projection 2. The pair of projections 1a, 1b for pressing the battery 6 and the projection 2 are inclined toward the interior of a battery insertion part to hold the battery 6 in a stable manner.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coin-type or button-type battery or electric double layer capacitor, and a battery holder for inserting and holding the battery or electric double layer capacitor.

[0002]

2. Description of the Related Art In recent years, a disc-shaped battery such as a coin type or a button type has been used for memory backup or the like. The holding to these batteries has been performed by soldering to the substrate after terminal welding or by inserting a holder. For example, a battery holder for holding these batteries on a printed wiring board is required to have various functions, and has been used in addition. For example, there are a combination of a resin and a metal as disclosed in JP-A-8-102309, and a combination of a resin and a heat-resistant resin as disclosed in JP-A-8-153500.

[0003]

In recent years, due to an increase in environmental problems, there is a demand for ease of decomposition at the time of disposal and reduction of materials to be separated from the design stage. When the battery is soldered to the substrate after terminal welding, the material to be separated can be reduced by one in comparison with the conventional holder using resin, but it is not easy to remove and separate the battery at the time of disposal.

[0004] With respect to the holder, there is the opposite problem.
Further, the holder has a large number of parts and is a large cost increase factor. Apply solder cream etc. to the soldering part on the printed circuit board in advance and place the parts on that part, or supply the small solder balls to the soldering part after placing the parts, and the soldering part A method in which the solder is melted and soldered by passing the printed circuit board on which the components are mounted in a furnace in a high-temperature atmosphere set at a temperature not lower than the melting point of, for example, 200 to 230 ° C. (hereinafter referred to as reflow soldering). It is required to dispose the holder. In that case, an expensive heat-resistant resin must be used in a holder using a conventional resin. Further, the heat-resistant resin is thermally stable and is also stable against biodegradability, so that when it is discarded, the environmental load is large.

[0005] holder using a resin are stable intensity just height for ensuring that holds the battery increases with the area. Therefore, in a portable device such as a cellular phone in which lightness, smallness, and smallness are most important, the device is inevitably obstructive. Furthermore, a holder using a heat-resistant resin is exposed to a temperature close to the melting point during reflow soldering. Passing through a reflow furnace a plurality of times during solder mounting of components leads to deformation of the resin, which results in sufficient battery retention. Cannot be guaranteed.

[0006] Solder materials are becoming lead-free for environmental protection. The melting temperature of the solder tends to increase with the lead-free process. Therefore, the conventional heat-resistant resin causes deformation, and it is not possible to guarantee sufficient battery retention. An object of the present invention is to provide a battery holder which stably holds a battery with a minimum size, is inexpensive in terms of cost, and has little environmental load.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention comprises only metal. Thereby, it is not necessary to use a heat-resistant resin. Since the battery is also held down by one or more metal protrusions and the wall of the holder, the battery can be held much more compactly and stably than holding down with a resin.
Also, at the time of disposal, the protrusions can be easily separated and discarded by bending the projection with a screwdriver or the like.

In general, components arranged on a wiring board are almost square except for batteries. Therefore, a circular battery has dead spaces at four corners. Therefore, the space was actively used as a place for fixing the holder. As a result, the mounting area could be reduced.

[0009]

FIG. 1 is a plan view showing an example of the present invention. FIG. 1 shows a battery holder having an outer wall 9 made of a metal having an octagonal curve and located near the outer periphery of the battery 6. The protrusion 2 for holding the battery 6 is provided at one end of the outer wall 9. A pair of protrusions 1a and 1b for holding down the battery 6 are provided at an end of the outer wall 9 provided with the protrusion 2 on a side opposite to the protrusion 2. By inclining the projections 1a, 1b and the projection 2 toward the center of the battery holder, a spring property is provided, so that the battery 6 can be stably held. Thereby, the negative electrode of the battery 6 is pressed against the projection 4 serving as the negative electrode contact, and the electrical contact is stabilized.

As shown in FIG. 3, extending the projection 2 to the center of the battery for holding down the battery 6 is also effective in holding the battery stably. Further, when the protrusion 2 for holding down the battery 6 is extended, a pair of protrusions 1a and 1b for holding down the battery need not be provided as shown in FIG. By making the outer wall 9 of the battery holder continuous, the shape of the battery holder could be stabilized.
This reduced the deformation in handling.
Also, even if a large amount of the battery holder is subjected to barrel plating, it is not deformed.

The battery holder was fixed to the substrate 15 by soldering the projections 3a, 3b, 3c and 3d provided for soldering in the space of the square 5 in contact with the outer wall 9. The projections 3a, 3b, 3c, 3d are
At the end opposite to the end of the outer wall 9 provided with a, 1b, and 2, it was provided inside the square 5 contacting the outer wall 9 and outside the outer wall 9.

As the material of the holder, stainless steel or a metal having a strong spring property is used. To improve the wettability with solder and reduce the contact resistance with the battery, nickel,
It is preferable to place gold and solder. The arrangement method includes plating, vapor deposition, sputtering, and the like, but is not particularly limited. As a result, the number of components and the mounting area can be reduced.

As shown in FIG. 4, it is also possible to peel off the resin layer 11 of the substrate 15 and expose the metal layer 12 of the substrate to make a contact. In this case, if a projection is provided on the negative electrode can of the battery, the contact with the substrate 15 changes from the surface contact to the point contact, the contact resistance between the battery and the substrate is reduced, and the electrical reliability is improved.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described. Example 1 A 0.15 mm-thick stainless steel (SUS430) in which the positive electrode side has the same structure as that of FIG.
Was fabricated. The size was set to accommodate a battery 6.8 having a diameter of 6.8 mm and a height of 2.1 mm. Contact 4 having spring property and inclining toward the inside of the holder in contact with the battery negative electrode
Was provided. The material is also nickel plated 0.1
Stainless steel (SUS430) having a thickness of 5 mm was used.
FIG. 2 shows a sectional view when the battery is inserted. Thereby, the battery 6 can be stably inserted at the time of insertion, and the electrical contact can be secured by the spring pressure from below also during the holding.

Embodiment 2 FIG. 5 shows a structure in which the resin layer 11 of the substrate 15 is peeled off, and the metal layer 12 of the substrate 15 is exposed to form a contact. Fig. 3 shows the positive side
0.15 nickel-plated with the same structure as
It was manufactured by processing stainless steel (SUS430) having a thickness of mm. The size was set to accommodate a battery 6.8 having a diameter of 6.8 mm and a height of 2.1 mm. The protrusion 2 for holding the battery 6 was enlarged to the center of the holder, and was inclined to have a spring property. The surface of the metal layer 12 of the substrate in contact with the battery negative electrode was plated with gold. The exposed portion had a diameter of 5.5 mm and was larger than the flat portion of the battery negative electrode having a diameter of 4.3 mm. As a result, electrical contact was secured.

EXAMPLE 3 Using the same holder as in Example 2, the center of the flat portion of the negative electrode can of the battery 6 to be inserted was 0.3 mm in diameter and 0.05 mm in height.
Are provided. Thereby, the battery 6 and the metal layer 1 of the substrate
The contact with No. 2 changed from surface contact to point contact. In Example 2, the contact resistance between the substrate and the battery was 0.7Ω, but in Example 3, it was 0.3Ω.

Embodiment 4 As shown in FIG. 6, protrusions 1a,
1b and the protrusion 2 were arranged above the positive electrode surface of the accommodated battery, and the angle of the turn was tight. FIG. 7 is a view as seen from above. The diameter of the circle 13 contacting the outer wall 9 is R1, the diameter of the circle 14 contacting the protrusions 1a and 1b for holding the battery 6 and the tip of the protrusion 2 is R2, and the diameter of the battery 6 is R. Also, projections 1a,
Assuming that the thickness of the protrusion 1b and the projection 2 is T, the following expression must be satisfied: R1> R + 2T R2 <2R-R1.

Further, the height of the protrusion for pressing the battery 6 of the battery holder of the present invention to the top of the protrusion is H1, the height of the contact 8 having the spring property when it is most crushed is H2, and the height of the battery is H. Then, the length L of the projection 1 for holding down the battery of the holder must be L <H1-H2-H.

In this embodiment, the diameter is 6.8 mm and the height is 1.
Using a 4mm battery, the holder is a 0.1mm thick SU
S304H material was used. Each dimension (mm) is R1 = 7.
1, R2 = 6.3, R = 6.8, T = 0.1, H1 =
2.13, H2 = 0.15, H = 1.4, L = 0.45
And Thereby, the insertability of the battery was improved. further,
Since the battery can be inserted while keeping it parallel to the board,
Automated battery installation has become easier.

In this embodiment, as shown in FIG. 1, the structure is octagonal when viewed from the top, but it goes without saying that the same effect can be obtained even if any polygon or circle is used. Considering the ease of battery insertion and the empty space of the board to be placed, the curved shape may be adjusted as long as the holding strength required by the device can be secured. Further, the outer wall of the battery holder of the present invention may be cut to the extent that the holding strength required by the device can be secured for the purpose of weight reduction, cost reduction, ease of battery removal, and the like.

In the specification of the present invention, a battery has been described, but it goes without saying that the present invention can be applied to a coin-type or button-type electric double layer capacitor having an equivalent shape.

[0022]

As is apparent from the above description, the present invention can reduce the number of resin parts which cause an environmental load and can provide a battery holder which is inexpensive and has high industrial utility value. In addition, since the mounting area can be reduced, it is most suitable for application to portable equipment that is becoming smaller.

[Brief description of the drawings]

FIG. 1 is a top view of a battery holder according to the present invention.

FIG. 2 is a cross-sectional view of the battery holder according to the present invention when using a contact having a spring property and being inclined inward of the holder in contact with the negative electrode.

FIG. 3 is a top view of the battery holder of the present invention in a case where a projection is inclined to have a spring property in order to press a battery.

FIG. 4 is a top view of the battery holder of the present invention in a case where the projections are inclined to hold the battery and have a spring property. (Without a pair of protrusions to hold down the battery)

FIG. 5 is a cross-sectional view of the battery holder of the present invention when the metal of the substrate is exposed to form a contact.

FIG. 6 is a cross-sectional view of the battery holder of the present invention in a case where the folded position of the projection for holding down the battery is higher than the bottom surface of the positive electrode can when stored.

FIG. 7 is a top view of the battery holder of the present invention when the folded position of the protrusion for holding down the battery is higher than the bottom surface of the positive electrode can at the time of storage.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 A pair of projections for holding down a battery 2 A projection for holding down a battery 3 A projection provided for soldering 4 A projection serving as a negative electrode contact 5 A square contacting the outer wall 9 6 A battery 8 A contact having springiness 9 An outer wall 11 Resin of a substrate Layer 12 Metal layer of substrate 13 Circle in contact with outer wall 14 Circle in contact with tip of protrusion for holding battery 15 Substrate

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor: Tsugio Sakai 1-8-1, Nakase, Mihama-ku, Chiba-shi, Chiba Prefecture Inside Seiko Instruments Inc. (72) Tsuneaki Tamachi 1-8, Nakase, Mihama-ku, Chiba-shi, Chiba Address Seiko Instruments Co., Ltd. F term (reference) 5H020 AA02 AS04 AS14 BB03 CC02 CC12 CC23 CC24 DD02 DD20 EE01 HH01

Claims (7)

[Claims] 1. A battery holder made of metal for holding a battery by inserting the battery from an upper part of a substrate, comprising: an outer wall (9) made of a polygonal or circular metal close to the outer periphery of the battery; and one end of the outer wall. And one or more projections (1a, 1b,
2) a plurality of projections (3a, 3b, 3c, 3d) used for soldering, which are provided at the other end of the outer wall and are provided inside the square contacting the outer wall and outside the outer wall; A battery holder, comprising: a contact on a substrate on which an outer wall is arranged, the contact being in contact with the battery negative electrode inside the outer wall. 2. The battery holder according to claim 1, wherein at least one of the projections (1a, 1b, 2) is inclined downward from an upper surface of the holder. 3. The battery holder according to claim 1, wherein a contact contacting the battery negative electrode protrudes from an upper surface of the substrate. 4. The battery holder according to claim 3, wherein a contact contacting the battery negative electrode has a spring property. 5. The battery holder according to claim 1, wherein a contact point in contact with the battery negative electrode is larger than a flat portion of the battery negative electrode held. 6. The diameter of a circle in contact with the outer wall of the battery holder is R
1. The diameter of a circle in contact with the tip of the protrusion for holding the battery is R2, the thickness of the protrusion for holding the battery is T, the length is L, and the height from the substrate to the top of the protrusion is H1, If the height of the spring contact when it is most crushed is H2, the diameter of the battery to be inserted is R, and the height is H, the three equations of R1> R + 2T R2 <2R-R1 L <H1-H2-H The battery holder according to claim 3, which satisfies. 7. A coin-type or button-type battery, wherein one or more projections are provided on a flat portion of a negative electrode can.