JPH11195406A - Charging device for secondary battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a charging device for a secondary battery in which the reliability of a support structure for a battery contacting terminal is improved and the variation in the terminal height by product is reduced. SOLUTION: This charging device for a secondary battery is provided with a case 12 in which a battery housing part 17 for housing a secondary battery is formed; a charged current supplying part housed in this case 12; a battery contacting terminal 13 partly exposed to the battery housing part 17 out of the case 12; a printed board 14 connected to the charged current supplying part in the case 12; a recessed part for supporting the battery contacting terminal 13 formed on the printed board 14; a soldering part combining the battery contacting terminal 13 with the printed board 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a charging device for charging a secondary battery, and more particularly to an improvement in a terminal structure for contacting a battery.

[0002]

2. Description of the Related Art Conventionally, as a charging device for charging a secondary battery, there is a charging device having a structure shown in a sectional view of FIG. In the figure, 1 is a transformer core, 2 is a bobbin, 3 is a primary winding, 4
Is a secondary winding, 9 is a transformer terminal, 10 is a blade, 11 is a lower case, 12 is an upper case, 13 is a battery contact terminal, and 14 is a printed circuit board.

The windings 3 and 4 are wound around a bobbin 2, and the primary winding 3 is connected to a blade 10. Secondary winding 4 is connected to printed circuit board 14 via transformer terminal 9. A rectifier circuit for converting the AC output of the secondary winding 4 to DC is mounted on the printed circuit board 14. Case 11,
Reference numeral 12 is formed of an insulating resin material, and includes a charging current supply unit including components 1 to 4 constituting a transformer and a rectifier circuit component on the printed circuit board 14.

The upper surface of the upper case 12 has a secondary battery 20
Is formed into a concave-shaped battery accommodating portion 17 for accommodating the same. Part of the battery contact terminal 13 is removed from the case 12 to the battery housing 17.
And comes into contact with a terminal (not shown) of the secondary battery 20. The battery contact terminal 13 is connected to the printed circuit board 14 in the case 12 and supplies the DC output of the rectifier circuit described above to the secondary battery 20.

FIG. 4 is an enlarged sectional view showing the battery contact terminals 13 and the printed circuit board 14. The battery contact terminal 13
A first curved portion 31 which is made of a conductive wire having elasticity and is exposed to the battery accommodating portion 17; a second curved portion 32 which is curved in a direction opposite to the first curved portion 31;
And a straight portion 39 to be soldered to the circuit pattern No. 4. Printed circuit board 14
Is formed with a through hole 41 into which the straight portion 39 is inserted. The straight portion 39 is inserted into the through hole 41 in a direction perpendicular to the surface of the substrate 14. 50 is a soldering part.

[0006] As shown in FIG.
7, the first curved portion 31 of the battery contact terminal 13
A force shown by an arrow A in FIG. Since the first curved portion 31 has elasticity in the opposite direction to the force A, the first curved portion 31 and the terminal of the battery 20 elastically contact each other. The above-described elasticity of the first curved portion 31 is equivalent to the linear portion 3
This is caused by a support structure in which the tip 30 of the terminal 13 is slid in the directions of arrows B and C along the inner wall surface of the case 12 with the 9 fixed to the substrate 14.

[0007]

In FIG. 4, a terminal 1 is shown.
If the distal end 30 of the third part 3 is a free end, a force is also applied to the other end part, namely, the linear part 39 and the soldering part 50. At this time, since the linear portion 39 is mechanically fixed only by the soldering portion 50, an excessive load is applied to the soldering portion 50, which causes peeling or poor contact. If the length of inserting the straight portion 39 into the through hole 41 at the time of soldering is different, the first
There is also a problem that the height of the curved portion 31 varies. These are the problems to be solved by the present invention.

The present invention improves the reliability of the supporting structure of the battery contact terminal by improving the structure of the soldering portion between the battery contact terminal and the printed circuit board, and reduces the variation in terminal height between products. It is an object of the present invention to provide a charging device for a secondary battery.

[0009]

SUMMARY OF THE INVENTION The object of the present invention is as follows.
A case in which a battery accommodating section for accommodating the next battery is formed, a charging current supply section accommodated in the case, a battery contact terminal partially exposed to the battery accommodating section from inside the case, A secondary battery comprising: a printed circuit board connected to the charging current supply unit; a recess formed in the substrate for supporting the terminal; and a soldering unit for connecting an end of the terminal to the substrate. This can be achieved with a charging device.

According to the present invention, a recess is formed in the printed circuit board, and the battery contact terminal is fitted into the recess. For this reason, the load applied to the terminal can be received by the substrate, and the occurrence of peeling or poor contact at the soldered portion can be prevented. Thereby, the reliability of the support structure of the battery contact terminal is improved. At the same time, the positioning of the terminals can be performed by the recesses, so that variations in terminal height for each product are reduced.

According to an embodiment of the present invention, the battery contact terminal has a first curved portion that forms the part exposed to the battery accommodating portion, and is curved in a direction opposite to the first curved portion. A second curved portion, and a third curved portion bent into a shape fitted into the concave portion of the substrate with the substrate interposed therebetween, wherein the second curved portion is provided with the first curved portion. It has a structure formed so as to connect with the third curved portion.

As a more specific support structure of the present invention,
The end of the battery contact terminal to be soldered is formed on a fourth curved portion connected to the third curved portion and protruding toward the substrate, and the fourth curved portion of the substrate is formed. A through hole for accommodating the fourth curved portion is formed at a position corresponding to the portion.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to embodiments shown in the drawings. FIG. 1 is a cross-sectional view showing a charging device for a secondary battery according to an embodiment of the present invention, and FIG. 2 is an enlarged view of a main part of FIG. Each part in FIG. 1 is substantially the same as each part in FIG. 3, and parts that are not directly related to the present invention are denoted by the same reference numerals and detailed description thereof will be omitted. The features of the present invention are the structure of the battery contact terminal 13 and the printed circuit board 14.
2 (A) shows an enlarged cross-sectional view of the structure, and FIG. 2 (B) shows a side view of the battery contact terminal 13 alone.

According to the embodiment of the present invention, the battery contact terminal 13 is exposed to the battery accommodating portion 17 and the battery (20 in FIG. 3).
A first curved portion 31 forming a portion that contacts the terminal of
A second curved portion 32 curved in a direction opposite to the first curved portion 31 and a concave portion 4 of the substrate 14 with the printed substrate 14 interposed therebetween;
The third bending portion 33 bent into a shape to be fitted to the second bending portion 33
And As shown, the second bending portion 32 is formed so as to connect the first bending portion 31 and the third bending portion 33.

The end of the battery contact terminal 13 to be soldered is formed on a fourth curved portion 34 which is connected to the third curved portion 33 and protrudes toward the substrate 14. Also, the substrate 14
At a position corresponding to the fourth curved portion 34, a through hole 43 for accommodating the fourth curved portion 34 is formed. Terminal 13
The free end 30 slides on the inner wall surface of the case 12 as in FIG.

As is clear from the sectional view of FIG.
In the terminal support structure of the present invention, since the concave portion 42 is formed in the substrate 14, the third curved portion 33 of the terminal 13 is fitted into the concave portion 42, and the third curved portion 33 is
Is fixed so as to sandwich it. Therefore, even when an external force from the battery is applied to the first bending portion 31 and the force is transmitted to the third bending portion 33 via the second bending portion 32, the external force is generally reduced to the third bending portion 33. Is absorbed by the substrate 14 at the engagement portion between the groove and the concave portion 42, and is not transmitted to the soldering portion 50. For this reason, the mechanical connection between the soldering portion 50 and the fourth curved portion 34 is maintained in a good condition, and the occurrence of peeling or poor contact of the soldering portion 50 is prevented.

In the present invention, the third curved portion 33 of the terminal 13 is provided.
The mounting height of the terminal 13 does not depend on the soldering portion 50 because of the support structure in which the terminal 13 and the concave portion 42 of the substrate 14 are fitted. For this reason, the battery accommodating portion 17 of the first bending portion 31
The protrusion height into the inside is made constant, and the variation in terminal height for each product is reduced.

Both the conventional charging device shown in FIG. 3 and the charging device of the present invention shown in FIG. 1 have been described by showing only one of the pair of battery contact terminals. The other battery contact terminal not shown in FIG.
And arranged in a direction perpendicular to the plane of FIG. In the conventional charging device shown in FIG. 3, the shape of the other battery contact terminal is symmetrical to the illustrated battery contact terminal 13, so two types of terminal parts are required. On the other hand, in the present invention, since parts having the same shape are used as the pair of battery contact terminals 13, there is an advantage that the number of parts can be reduced.

[0019]

As described above, according to the present invention, since the structure of the soldering portion between the battery contact terminal and the printed circuit board is improved, the reliability of the support structure of the battery contact terminal is improved, and Can reduce the variation in the terminal height of the secondary battery.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an entire charging device showing an embodiment of the present invention.

FIG. 2 is an enlarged structural view showing a main part of FIG.

FIG. 3 is a cross-sectional view showing the entire conventional charging device.

FIG. 4 is an enlarged sectional view showing a support structure of the battery contact terminal of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transformer core 2 Bobbin 3 Primary winding 4 Secondary winding 9 Trans terminal 10 Blade 11 Lower case 12 Upper case 13 Battery contact terminal 14 Printed circuit board 17 Battery housing part 20 Secondary battery 31 First curved part 32 First 2nd curved portion 33 third curved portion 34 fourth curved portion 42 concave portion 43 through hole 50 soldering portion

Claims (3)

[Claims] 1. A case in which a battery accommodating section for accommodating a secondary battery is formed, a charging current supply section accommodated in the case, and a battery contact partially exposed from the case to the battery accommodating section. A terminal; a printed circuit board connected to the charging current supply unit in the case; a recess formed on the substrate for supporting the terminal; and a soldering unit for coupling an end of the terminal to the substrate. A charging device for a secondary battery, comprising: 2. The battery connecting terminal according to claim 1, wherein the battery contact terminal includes a first curved portion that forms the part exposed to the battery housing portion,
A second bending portion bent in a direction opposite to the bending portion, and a third bending portion bent to a shape fitted into a concave portion of the substrate with the substrate interposed therebetween; The charging device according to claim 1, wherein a portion is formed so as to connect the first curved portion and the third curved portion. 3. The soldered end of the battery contact terminal is formed on a fourth curved portion connected to the third curved portion and protruding toward the substrate, and The charging device according to claim 2, wherein a through hole that accommodates the fourth curved portion is formed at a position corresponding to the fourth curved portion.