JPH1140119A - Battery adapter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery adapter, in which there is no need for applying special modification as a substitute of a mercury battery in which a cylinder part side face is insulated, and an easily obtainable battery can be used. SOLUTION: This device is provided with a first printed wiring board 42 provided with a space for mounting a second battery 2a that is a substitute battery at a lower part of a cylinder part of an insulation resin case 41 having its outer diameter identical to an outer diameter of a mercury battery, and a contact part 46 at which gold coating is applied where a negative electrode of a second battery 2a comes into contact at an upper part thereof, and a cathode terminal of a short key battier diode 44 (diode in the figure) is connected to this printed wiring board 42, and that anode terminal is connected to a second printed wiring board 43. The printed wiring board 43 is provided with a protrusion 45, to which a gold coating which functions similarly as the negative electrode of the battery is applied. An external shape is aligned with an external shape of a mercury battery, and a battery terminal voltage is adjusted by a positive direction voltage fall component of a diode 44.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery adapter for a small cylindrical primary battery used in portable electronic equipment and the like, which is used as a substitute for another battery having a smaller external shape and a higher electromotive force. About.

[0002]

2. Description of the Related Art Among cylindrical small primary batteries, production of mercury batteries has been discontinued due to global environmental problems, and switching to other types of batteries having substantially the same outer shape has been progressing. However, some mercury batteries do not have replacement batteries with almost the same outer shape, and the values of the electromotive force of the batteries are different between mercury batteries and other types of batteries, so they cannot be replaced by simple replacement The case has also occurred.

In order to solve such a problem, in the prior art, for example, there is a method using a battery adapter as disclosed in Japanese Utility Model Registration No. 3020967. FIG. 4 is a sectional view showing the battery adapter 3 disclosed in this publication, and FIG. 5 is an external view showing the shape of the first battery 1 and the second battery 2 to which the battery adapter 3 relates.

[0004] The first battery 1 is a mercury battery without a replacement battery, and the second battery 2 is a silver battery smaller in size and higher in electromotive force than this mercury battery. The outer shape of each of the batteries 1 and 2 is determined by the positive electrode cases 12 and 22 and the negative electrode sealing plates 11 and 12 which are provided at the upper ends thereof with their periphery insulated. The battery adapter 3 includes a conductive case 31 formed in the same outer shape as the positive electrode case 12, a cylindrical insulating collar 32 set on a cylindrical inner peripheral surface of the case 31, and the battery case 3 surrounded by the insulating collar 32. And a disk-shaped printed circuit board 33 housed in the case 31. The inner diameter of the case 31 is set to a size that allows the second battery 2 to be easily attached to and detached from the inside.

[0005] A cutout for accommodating the diode 35 is formed in the printed board 33, and the thickness of the printed board 33 is set so that the diode 35 is completely accommodated in the cutout. A conductive contact surface 34 that is in contact with the bottom surface of the positive electrode case 22 of the silver battery as the second battery 2 is formed in the entire area except for the cutout on the front surface side of the printed circuit board 33. A region for soldering the terminal of the diode 35 is formed on the back surface, and the anode terminal of the diode 35 is connected to the contact surface 34 from the region through a through hole (not shown). The cathode terminal of diode 35 is connected to conductive case 31 via a printed circuit board.

In this state, when the current in the actual use state flows through the diode 35, the voltage drop in the diode 35 reduces the electromotive force of the second battery 2 to a value corresponding to the electromotive force of the first battery 1. The depth of the inside of the conductive case 31 is such that when the second battery 2 is mounted, the negative electrode sealing plate 21 of the second battery 2 projects above the conductive case 31 and the negative electrode sealing plate 21 The thickness from the upper surface to the lower surface of the conductive case 31 is set to be substantially the same as the thickness of the first battery 1.

As described above, when the second battery 2 is mounted on the battery adapter 3 and used, it becomes a substitute for the first battery 1. In the case of the battery adapter 3 having the above structure, since the conductive case 31 is used, a first battery in which the cylindrical surface of the battery is insulated, for example, an MR-52 type mercury battery,
It may be difficult to apply when using For example, this corresponds to a case where a plurality of batteries are stacked and used in a conductive cylindrical case. This is because if the cylindrical surface of the battery is not insulated, the conductive cylindrical case will short-circuit the stacked battery.

[0008]

SUMMARY OF THE INVENTION An object of the present invention is to provide an alternative to the first battery in which the surface of the cylindrical portion of the case-like positive electrode is insulated without the need for special modification and to obtain the battery. An object of the present invention is to provide a battery adapter that can use an easy battery.

[0009]

According to the present invention, as an alternative to the first battery in which the surface of the cylindrical portion of the case-like positive electrode is insulated, the size of the electromotive force is smaller than that of the first battery. And a battery adapter for using a second battery having a high voltage, and for reducing an electromotive force value of the second battery to an electromotive force value of the first battery at a current value in an actual use state. A voltage reducing means having a parallel plane, one surface having a contact portion with the second battery, and the other surface having an electrode portion having the same function as the electrode of the first battery;
It has a cylindrical shape having an outer diameter substantially the same as the outer diameter of the battery, and stores the voltage reducing means in a state where the electrode portion of the voltage reducing means protrudes from the cylindrical portion at one opening side of the cylinder, and the other. A second battery can be mounted from the opening, and an insulating resin case in which one electrode of the second battery projects in a state where the second battery is mounted. In the state where the battery is mounted, the thickness from the surface of the electrode portion of the voltage reducing means to the surface of the protruding electrode of the second battery is substantially the same as the thickness of the first battery.

The cylindrical side surface of the battery adapter is insulated because it is an insulating resin case, and the high electromotive force of the second battery is reduced to the electromotive force of the first battery by the voltage reducing means. The external dimensions of the battery adapter with the battery mounted are substantially the same as the external dimensions of the first battery. Further, the voltage reducing means is composed of two printed boards and a Schottky barrier diode connected between the two printed boards so that the current direction when the second battery is mounted is forward. The contact portions and the electrode portions of the voltage reducing means are plated with gold.

The Schottky barrier diode is a diode having a small forward voltage drop, which has a forward voltage drop of about 0.2 V in a rated current region, and has a difference in electromotive force between the first battery and the second battery. Suitable for adjusting. Further, the gold plating applied to the contact portion and the electrode portion reduces the contact resistance and increases the reliability of the contact portion. Further, the first battery is a MR-52 type mercury battery, the second battery is a battery having an electromotive force of about 1.55 V, and the Schottky barrier diode is about 0.2 V at a forward current of about 1 mA. It is a Schottky barrier diode having a voltage drop.

The MR-52 type mercury battery is a battery in which the surface of the cylindrical portion of the case-like positive electrode is insulated and has no substitute battery, and its electromotive force is 1.35V. As the second battery, for example, a silver oxide battery (electromotive force 1.55
When V) is used and a load current of about 1 mA is used, a Schottky barrier diode having a voltage drop of about 0.2 V at a forward current of about 1 mA is optimal.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to examples. FIG. 1 shows a battery adapter 4 according to the present invention.
FIG. 2 is a partial cross-sectional view showing the structure of FIG. 1, FIG. 2 shows a first battery 1a and a second battery 2a related to the battery adapter 4 of FIG. 1, (A) is an external view of the first battery 1a, FIG. 3B is an external view of the second battery 2a, and FIG. 3 is a forward voltage drop at 25 ° C. of a Schottky barrier diode (diode in FIG. 1; hereinafter abbreviated as diode) 44 used in the embodiment. FIG. 4 is a diagram showing an example of a relationship between the forward current and the forward current.

The battery adapter 4 of the embodiment uses an MR-52 type mercury battery as the first battery 1a and an SR-44 type silver oxide battery as the second battery 2a. Each battery has a cylindrical case-shaped positive electrode (positive case in the prior art) 12a and
22a,-electrode (negative electrode sealing plate in the prior art) 11a and 21a
The insulating film 13 is formed on the cylindrical side surface of the positive electrode 12a of the first battery 1a, and the side surface is in an insulated state.

The battery adapter 4 has an insulating resin case 41 made of ABS resin, and a battery case 2 fixed to an upper inside thereof.
It is composed of two printed boards 42 and 43 and a diode 44 connected between the two printed boards. The insulating resin case 41 has an outer diameter substantially the same as the outer diameter of the first battery 1a, and has an inner lower side formed to have an inner diameter in which the second battery 2a can be mounted. The depth is set such that the lower surface of the + electrode 22a of the second battery 2a projects about 1 mm in the mounted state. The first printed board 42 of the two printed boards contacts the negative electrode 21a of the second battery 2a. The contact portion 46 is plated with gold having low contact resistance and high contact reliability. The cathode terminal of the diode 44 is connected to the contact portion 46. The anode terminal of the diode 44 is connected to a second printed board 43, and the second printed board 43 is fixed to the uppermost portion inside the insulating resin case 41. A metal protrusion 45 having the same function as the negative electrode of the battery is formed on the upper surface thereof, and the surface thereof is plated with gold having a low contact resistance and high contact reliability. protrusion
45 protrudes from the insulating resin case 41, and in the case of FIG.
Projecting from. The thickness from the upper surface of the protrusion 45 to the lower surface of the second battery 2a in the mounted state is equal to the thickness of the first battery 1a.
The overall thickness is set so as to be approximately the same as

FIG. 3 is an example of a characteristic diagram of a diode 44 connected between the first printed board 42 and the second printed board 43 so as to be connected in a forward direction to the second battery 2a. Where the horizontal axis is the forward current value and the vertical axis is the voltage drop at 25 ° C. As can be seen from FIG. 3, the voltage drop changes depending on the value of the forward current, but the voltage drop can be regarded as substantially constant unless the current value in the use state changes significantly. In the embodiment, the electromotive force is 1.35 V in the case of the MR-52 type mercury battery as the first battery 1a, and the electromotive force in the case of the SR-44 type silver oxide battery as the second battery 2a. Is 1.55V, the required voltage value can be adjusted by using the diode 44 having a voltage drop of about 0.2V. In the case of FIG. 3, this condition is satisfied when the current value in the use state is slightly less than 1 mA.
In this way, by selecting the diode 44 corresponding to the current value in the use state, it is possible to adjust the voltage value to a required value.

In the above embodiment, the two printed boards 42 and 43 as voltage reducing means and the diode 44 are arranged on the minus electrode side of the second battery 2a, but are arranged on the plus electrode side. It is also possible. In this case, the diode 44
Have opposite polarities. Although the forward voltage drop of the diode 44 has temperature dependency, the value of the output electromotive force of the battery adapter can satisfy necessary conditions such as the temperature dependency of the electromotive force of the battery even if these are included.

A second battery 2a is connected to such a battery adapter 4.
By mounting the second battery 2a, the first battery 1a
Can be used as an alternative to

[0019]

According to the present invention, as an alternative to the first battery in which the surface of the cylindrical portion of the case-shaped positive electrode is insulated, the first battery has a smaller size and a higher electromotive force than the first battery. A battery adapter for using two batteries, two parallel planes for reducing the electromotive force value of the second battery to the electromotive force value of the first battery at a current value in an actual use state. A voltage reducing means having a contact portion with the second battery on one plane and an electrode portion having the same function as the electrode of the first battery on the other plane; It has a cylindrical shape having an outer diameter substantially the same as the outer diameter, and the voltage reducing means is stored in a state where the electrode portion of the voltage reducing means protrudes from the cylindrical portion on one opening side of the cylinder, and the other opening portion stores the voltage reducing means. Can be mounted with a second battery, and one of the second batteries in a state where the second battery is mounted. An insulating resin case having a protruding pole, wherein the surface of the electrode of the second battery protrudes from the surface of the electrode portion of the voltage reducing means when the second battery is mounted on the insulating resin case. Thickness up to the first
As a substitute for the first battery in which the surface of the cylindrical portion of the case-like positive electrode is insulated, there is no need for special remodeling, and a battery that is easily available is used. A usable battery adapter can be provided.

Further, the voltage reducing means includes two printed boards, and a Schottky barrier diode connected between the two printed boards so that the current direction when the second battery is mounted is forward. Since the contact portion and the electrode portion of the voltage reducing means are plated with gold, it is easy to adjust the electromotive force difference between the first battery and the second battery, and a highly reliable battery adapter is provided. Can be provided.

Further, the first battery is a MR-52 type mercury battery, the second battery is a battery having an electromotive force of about 1.55 V, and the Schottky barrier diode is about 1 mA at a forward current of about 1 mA. Since it is a Schottky barrier diode with a voltage drop of 0.2 V, it is suitable for use as a replacement for MR-52 type mercury batteries, for which it is difficult to obtain a replacement battery, with a load current of around 1 mA. Battery adapter can be provided.

[Brief description of the drawings]

FIG. 1 is a partial sectional view showing the structure of a battery adapter according to the present invention.

2A and 2B show a first battery and a second battery related to the battery adapter of FIG. 1, wherein FIG. 2A is an external view of the first battery,
(B) is an external view of the second battery.

FIG. 3 is a diagram illustrating an example of a relationship between a forward voltage drop of a Schottky barrier diode and a forward current;

FIG. 4 is a cross-sectional view showing the structure of a conventional battery adapter.

5A and 5B show a first battery and a second battery related to the battery adapter of FIG. 4, wherein FIG. 5A is an external view of the first battery,
(B) is an external view of the second battery.

[Explanation of symbols]

 1, 1a first battery 11 negative electrode sealing plate 11a-electrode 12 positive electrode case 12a + electrode 13 insulating film 2, 2a second battery 21 negative electrode sealing plate 21a-electrode 22 positive electrode case 22a + electrode 3, 4 battery adapter 31 conductive Case 32 insulating collar 33 printed circuit board 34 contact surface 35 diode 41 insulating resin case 42 first printed board 43 second printed board 44 diode 45 protrusion 46 contact

Claims (3)

[Claims] 1. A second battery having a smaller size and a higher electromotive force than the first battery is used as an alternative to the first battery in which the surface of the cylindrical portion of the case-like positive electrode is insulated. Adapter having two parallel planes for reducing the electromotive force of the second battery to the electromotive force of the first battery at a current value in an actual use state. A voltage reducing means having a contact portion with the second battery and an electrode portion having the same function as the electrode of the first battery on the other plane; The voltage reducing means is stored in a state where the electrode of the voltage reducing means is protruded from the cylindrical part on one opening side of the cylinder, and the second battery is supplied from the other opening. Can be installed, second
And an insulating resin case in which one electrode of the second battery projects in a state where the second battery is mounted. When the second battery is mounted in the insulating resin case, an electrode portion of the voltage reducing means is provided. A battery adapter, wherein a thickness from a surface of the first battery to a surface of a protruding electrode of the second battery is substantially the same as a thickness of the first battery. 2. A voltage reducing means comprising: two printed boards; and a Schottky barrier diode connected between the two printed boards so that the current direction when the second battery is mounted is forward. The battery adapter according to claim 1, wherein the contact portion and the electrode portion of the voltage reducing means are plated with gold. 3. The first battery is an MR-52 type mercury battery,
The second battery is a battery having an electromotive force of about 1.55 V, and the Schottky barrier diode is a Schottky barrier diode having a voltage drop of about 0.2 V at a forward current of about 1 mA. Item 3. The battery adapter according to Item 2.