JPS5849575Y2 - Battery electrode connection structure - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an electrical connection structure between a battery electrode and a conductive pattern on a circuit board in a device using a button-type battery.

In recent years, button-type batteries have been increasingly used in wristwatches, calculators, cameras, and the like.

Making these devices thinner and smaller is always a big theme, and efforts are being made to make each part as thin and small as possible. Electrical connections between the battery and the circuit board are no exception; one of the conditions for miniaturization is to make the electrical connection inside the battery's outer shape. A battery receiving spring is simply inserted between the two, and a spring portion provided on the battery receiving spring is simply elastically deformed in the direction of the central axis of the battery.
The structure is such that an electrical connection is made by pressing between one electrode of the battery and a conductive pattern on the circuit board, but it is difficult to assemble, disassemble and repair the module.
Or, when the battery is removed when replacing it, etc., the battery receiving spring becomes free, so it can be easily moved from place to place, or it can be dropped on the floor and lost. It is difficult to handle.

In order to improve this handling, there is a structure in which the battery receiving spring as described above is fixed to the conductive pattern on the circuit board by soldering, but in this case, the thickness is reduced by the amount of soldering. This also increases the amount of soldering work.

This idea realizes an electrical connection structure that is thin, small, and easy to handle at low cost.

Hereinafter, a detailed explanation will be given based on the drawings. Figures 1 and 2 show one embodiment of this invention, and Figure 1 is a component diagram of a battery receiving spring according to this invention. is a plan view, b is a side view, and Fig. 2 is a plan view of Fig. 1.
FIG. 2 is an assembled cross-sectional view of a main part when the battery receiving spring shown in the figure is incorporated to electrically connect one electrode of the battery to a conductive pattern on a circuit board.

1 is a battery receiving spring, 2 is a button type battery, 3 is a circuit board, 4
Reference numeral 5 indicates a board support frame made of resin, and 5 a battery support spring that presses and holds the battery 2 against the wall of the board support frame 4.

The battery receiving spring 1 has a connecting spring part 1a and a holding spring part 1b. In the state shown in FIG. The end 1a' is pressed against one electrode 2a of the battery 2, the other end 1a'' is pressed against the conductive pattern 3a on the circuit board 3, and the contact between the electrode 2a and the conductive pattern 3a is While electrical connection is made, the holding spring portion 1b
When the battery receiving spring 1, whose tip 1b' is larger than the shape of the hole 4a of the basic support frame 4, is inserted into the hole 4a, the holding spring is Part 1b
is elastically deformed in a plane direction perpendicular to the central axis of the battery 2, and its tip 1b' is pressed against the inner wall surface of the hole 4a of the board support frame 4, so that even when the battery 2 is removed, the battery receiving spring 1 remains attached to the board. It will be held by the support frame 4.

Furthermore, when assembling the battery receiving spring 1 into the board support frame 4, the holding spring part 1b is elastically deformed in advance by holding the two holes 1c provided at the tip of the holding spring part 1b with tweezers or the like.

It can be easily inserted into the hole 4a.

As is clear from the figure, the outer shape of the battery receiving spring 1 is smaller than one electrode 2a of the battery 2, and is therefore sufficiently smaller than the outer shape of the battery 2.

Next, FIGS. 3 and 4 show other embodiments of this invention, and FIG. 3 is a component diagram of a battery receiving spring according to this invention, in which a is a plan view and b and c are side views. It represents
Further, FIG. 4 is an assembled sectional view of the main parts corresponding to FIG. 2 in the first embodiment.

6 is a battery receiving spring, 7 is a button type battery, 8 is a circuit board, 9
Reference numeral 10 indicates a board support frame made of resin, and 10 indicates a battery support spring that presses and holds the battery 7 against the wall of the board support frame 9.

The battery receiving spring 6 has spring parts 6a and 6b, and a fourth
In the state shown in the figure, the spring parts 6a and 6b are pressed between the battery 7 and the circuit board 8 and are elastically deformed in the direction of the central axis of the battery 7, so that the end 6a' of the spring part 6a is connected to one electrode 7a of the battery T.
Then, the end portions 6b' of the spring portions 6b are pressed against the conductive patterns 8a on the circuit board 8, thereby establishing an electrical connection between the electrodes 7a and the conductive patterns 8a.

On the other hand, the spring portion 6b has a bent portion 6b'' at its end, and this bent portion 6b'' is shown in FIG. 3C.
The bending width 11 of the battery receiving spring 6 is set smaller than the interval 1□ between the holes 8b of the circuit board 8 in FIG. 4 in the free state before the battery receiving spring 6 is assembled into the circuit board 8. is incorporated into the circuit board 8 and the battery receiving spring 6-4 is assembled.
When the bent portions 6b'' are inserted into the four corresponding holes 8b of the circuit board 8, the spring portions 6b are elastically deformed in a plane direction perpendicular to the central axis of the battery 7.
The bending width is expanded to the interval 12 between the holes 8b of the circuit board 8, and the bent portion 6b'' is pressed against the inner wall of the hole 8b, so that even when the battery 7 is removed, the battery receiving spring 6 remains in the circuit. It will be held on the substrate 8.

That is, before this implementation, the function of the holding spring part 1b in the first embodiment was replaced by a part of the connecting spring part that electrically connects the battery and the circuit board, and the independent holding spring part was omitted. It is configured so that it can be done.

Note that by performing through-hole processing on the hole 8b of the circuit board 8 and expanding the conductive pattern 8a to the inside of the hole 8b, the reliability of the electrical connection between the battery receiving spring 6 and the conductive pattern 8a is improved. It is also possible to do so.

As described above, this invention allows the battery receiving spring to connect itself to the circuit board and the conductive pattern on the circuit board within the range of the external shape of the battery, rather than simply making an electrical connection between one electrode of the battery and the conductive pattern on the circuit board. This makes it possible to provide a holding function to other parts such as a board support frame with a simple configuration, and provides an electrical connection structure that is thin, small, and easy to handle, and is different from the second embodiment. By allowing the connection spring portion to also serve as the holding spring portion, further miniaturization is possible.

[Brief explanation of drawings]

Figures 1 and 2 show one embodiment of this invention. Figures 1a and b are plan and side views of the parts of the battery receiving spring according to the invention, and Figure 2 is an assembly of the main parts. In cross-sectional view, Figure 3a,
Figures b, c and 4 show other embodiments of the present invention,
3a, b, and c are plan views and side views of the parts of the battery receiving spring according to the present invention, and FIG. 4 is an assembled sectional view of the main parts. 1.6...Battery receiving spring, 1a, 6a, 6b...
...Connection spring part, 1b, 6b...Holding spring part, 2,7...Battery, 3,8...Circuit board, 4,9... ... Board support crane

Claims (1)

[Scope of utility model registration request] A battery receiving spring is arranged between one electrode of the button-type battery and the circuit board, and the battery receiving spring is pressed in the direction of the center axis of the battery to electrically connect one electrode of the battery and the conductive pattern of the circuit board. A connection spring part that performs the connection, and a holding spring part that elastically deforms in a plane direction perpendicular to the central axis of the battery to detachably hold itself to another member are provided, and the external shape of the battery receiving spring is adjusted to the shape of the battery. A battery electrode connection structure characterized by being smaller than its external shape.