JPH11258366A - Contact structure of storage battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve contact structure of a secondary battery in a solar battery with a structure overlapping a circuit substrate and the second battery. SOLUTION: A storage battery 2 for a storage means of a watch module 1 and a minus lead plate 4 as a conducting member of the battery 2 are arranged in the position putting a circuit substrate in between. A secondary battery 2 is also arranged on one surface of the circuit substrate 6 and a minus lead plate 4 is arranged on the other surface of the circuit substrate 6. A minus lead plate 4 is projected through an opening 6b to the secondary battery side surface to conduct to the secondary battery 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a rechargeable electronic timepiece provided with a power generation means such as a solar cell and a power storage means such as a secondary battery without the need for battery replacement.

[0002]

2. Description of the Related Art Conventionally, a secondary battery used in a rechargeable electronic timepiece having a power generation means such as a solar cell and a power storage means such as a secondary battery can be repeatedly charged and discharged. Although it does not require replacement, if a normal silver oxide battery or the like is mistakenly installed, there is a risk that the silver oxide battery will be broken due to overcharge and the watch will be damaged. As a preventive measure, a terminal lead plate, which is a contact spring, is welded to one pole of a secondary battery to differentiate it from a normal battery in terms of shape. Many have a structure.
However, when this danger prevention measure is taken, there is a disadvantage that it is necessary to increase a conduction space of the secondary battery, and the assembling process of the timepiece becomes complicated. Means for establishing electrical continuity between the circuit board of the watch and the terminal lead plate of the secondary battery include, as shown in Japanese Utility Model Publication No. 7-18125, a tip of a protruding portion of a conductive member fixed to one pole of the secondary battery, 2. Description of the Related Art There is known a structure in which a spring member is pressed and contacted in the radial direction of a secondary battery to establish conduction.

[0003]

FIG. 3 is a sectional view showing a conventional example. According to Japanese Utility Model Publication No. 7-18125, the spring member 25 is pressed against the tip of the protruding portion of the conducting member 23 fixed to one pole of the secondary battery 22 in the radial direction of the secondary battery 22 to conduct electricity. By taking this, when a normal silver oxide battery or the like is accidentally incorporated, conduction with the circuit board cannot be established, and the danger of explosion due to the application of charging voltage to the silver battery is prevented. The rechargeable battery 22 is used for the watch substrate 2.
7 and the circuit receiver 26. However, in this configuration, the leading end of the conductive member 23 is projected outside the outer diameter of the secondary battery 22, and a spring member 25 for conducting with the circuit board is further provided outside the conductive member 23. Must be large, which has been an obstacle to the miniaturization of watches.

According to Japanese Utility Model Publication No. 7-18125, the circuit board is disposed at a position completely different from the secondary battery 22, and conduction between the secondary battery 22 and the circuit board is controlled by the spring member 25. The configuration is performed by the following. For this reason, solar clocks that generate power based on external energy and store the power are configured with a large number of circuit components such as capacitors in addition to the main circuit components such as IC chips and crystal oscillators. The circuit pattern also becomes a circuit board that requires a complicated circuit, and further requires an opening for making the battery part large, so that the circuit pattern naturally becomes large, which is an obstacle to miniaturization of the timepiece.
SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems, improve the planar space efficiency of a circuit board, and realize a simple and highly reliable structure for holding a secondary battery.

[0005]

To achieve the above object, the present invention provides a power generation means for generating power based on external energy, a storage battery for storing power from the power generation means, and an IC chip. A circuit board on which a power supply pattern for conducting with the storage battery is formed, a terminal lead plate fixed to at least one electrode of the storage battery, a contact portion for contacting the terminal lead plate, and A circuit lead plate having a flat portion for connection to a power supply pattern, wherein the circuit board has the power supply pattern on one surface and the storage battery is disposed on the other surface, The flat portion is arranged in contact with the power supply pattern, and the contact portion extends to the other side of the circuit board and contacts the terminal lead plate, The circuit board has an opening for extending the contact portion to the other side of the circuit board, the contact portion has an L-shaped hook portion, and the terminal lead plate is a power supply pattern. The hook portion is engaged with the hook portion so as to be brought into pressure contact with the side so as to conduct electricity.

[0006]

FIG. 1 is a cross-sectional view showing a battery module of a timepiece module according to an embodiment of the present invention. According to FIG. 1, the base of the timepiece module 1 is constituted by a timepiece substrate 7 made of a metal member, a plurality of columns 7 a implanted on the timepiece substrate 7, and a winding stem spacer 8 made of a non-metallic member. ing. A minus lead plate 4 (a circuit lead plate of the present invention), which is electrically connected to the secondary battery 2 as a storage battery, is fixed to a boss 8a of the winding stem spacer 8 at a fixed position.
It is placed on the winding spacer 8. Although not described in detail, a circuit board 6 on which a plurality of circuit components 6a such as an IC chip and a transistor are mounted is positioned by a support 7a of a timepiece board 7, and is mounted on a winding spacer 8; Although not described in detail, a power supply pattern wiring and the like which are in contact with the minus lead plate 4 to conduct electricity are formed on the lower surface side. The minus lead plate 4 is sandwiched between the winding stem spacer 8 and the circuit board 6 so that the flat portion 4b is sandwiched between the winding stem spacer 8 and the circuit board 6. Further, the minus lead plate 4 has a contact portion 4a which passes through the opening 6b of the circuit board 6, extends and protrudes toward the upper surface side of the circuit board 6, and is bent in a hook shape. An end of the terminal lead plate 3 welded to the negative electrode of the secondary battery 2 is pressed against the section 4a in the cross-sectional direction to abut and conduct. The secondary battery 2 is placed with the terminal lead plate 3 welded to the negative electrode facing the circuit board 6, held by a circuit support base 10 made of a non-metallic member, and holding down a battery pushing plate 5 made of a metal member. The positions are fixed in the cross-sectional direction by the portions 5a and 5b, and the circuit support base 10 and the battery pushing plate 5 are fixed by screws 9 and columns 7a.

The conduction form of the secondary battery 2 as a power source of the timepiece is such that the anode side is connected to the pattern of the circuit board 6 from the secondary battery 2 via the battery pushing plate 5 and the screw 9 and the column 7a of the watch substrate 7 (see FIG. 1, the lower side), and the negative side is the secondary battery 2
Lead plate 3 to minus lead plate 4 welded to the negative electrode of
Are supplied to the lower surface side of the circuit board 6 through the contact portions 4a.

As shown in the imaginary line of FIG. 1, the secondary battery 2 is inserted into the timepiece module 1 by a method (12).
From the end of the terminal lead plate 3 (position 13) to the contact portion 4a of the minus lead plate 4 bent into a hook shape.
(4 position). At that time, the pushing portion 5b of the battery pushing plate 5 is pushed by the secondary battery 2 and retreats to the 15 position, and when the terminal lead plate 3 of the secondary battery 2 comes into close contact with the circuit board 6, the elastic arm 5 described later In this configuration, the secondary battery 2 is brought into contact with the secondary battery 2 in the radial direction by the return force, and the secondary battery 2 is fixed in a hook shape.

FIG. 2 is a perspective view showing the battery unit shown in FIG. According to FIG. 2, the secondary battery 2 is placed on the upper surface side of the circuit board 6 so that the terminal lead plate 3 is in close contact therewith, held by the circuit support base 10, and the rigid pressing portion of the battery pressing plate 5. Both ends are fixed in a hook shape by a holding portion 5b having an elastic arm 5c that is bent left and right. Further, the circuit support base 10 and the battery pushing plate 5 are fixed by screws 9 with screws. The circuit board 6 on which the secondary battery 2 is mounted
A minus lead plate 4 is placed on the opposite side and the lower surface of the circuit board 6, and has a contact portion 4a that passes through the opening 6b of the circuit board 6 and protrudes from the upper surface of the circuit board 6. The contact part 4
a, a terminal lead plate 3 welded to the negative electrode of the secondary battery 2;
Of the negative lead plate 4 is pressed in the cross-sectional direction to establish electrical continuity.

[0010]

As is apparent from the above description, according to the present invention, the planar space efficiency of the circuit board is increased by arranging the secondary battery and the circuit board in an overlapping manner, and the secondary battery and the The negative lead plate, which is a conductive member, is placed at the position sandwiching the circuit board, and through the opening of the circuit board, the negative lead plate and the secondary battery are electrically connected to each other without conducting space in the plane direction. As a result, the size of the watch can be reduced, the rechargeable battery can be easily incorporated into the watch module,
There are many practical effects, such as cost reduction by realizing a simple and highly reliable secondary battery holding structure.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a state in which a battery of a timepiece module according to an embodiment of the present invention is mounted.

FIG. 2 is a perspective view showing a battery unit shown in FIG. 1;

FIG. 3 is a sectional view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Watch module 2, 12 Secondary battery 3, 13 Terminal lead plate 4, 14 Negative lead plate 4a Contact part 5 Battery pushing plate 5a, b Pushing portion 5c Elastic arm 6 Circuit board 6a Circuit component 6b Opening 7 Watch Circuit board 7a Prop 8 Winding spacer 8a Boss 9 Screw 10 Circuit support

Claims (3)

[Claims] 1. A power generating means for generating power based on external energy, a storage battery for storing power from the power generating means, an IC chip mounted thereon, and a power supply pattern for conducting with the storage battery are formed. A circuit board, a terminal lead plate fixed to at least one electrode of the storage battery, and a circuit lead plate having a contact portion for contacting the terminal lead plate and a flat portion for connecting to the power supply pattern. In the electronic timepiece, the circuit board has the power supply pattern on one surface, and the storage battery is arranged on the other surface, and the circuit lead plate is arranged such that the flat portion contacts the power supply pattern. And a contact portion extending to the other side of the circuit board and in contact with the terminal lead plate. 2. The contact structure for a storage battery according to claim 1, wherein the circuit board has an opening for extending the contact portion to the other side of the circuit board. 3. The contact portion has an L-shaped hook portion, and the terminal lead plate is engaged with the hook portion so that the circuit lead plate is pressed against the power supply pattern side. Item 2. The contact structure of the storage battery according to Item 1.