JP2549668Y2 - Battery pack - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery pack having a built-in printed circuit board, and more particularly to a structure for connecting a printed circuit board to a battery.

[0002]

2. Description of the Related Art In recent years, a battery pack in which a plurality of batteries are housed in a case may be configured such that various elements such as switching elements and diodes are built in the case. These elements are mounted on a relatively thin flexible printed circuit board and housed in a case, thereby reducing the size of the battery pack.

[0003] In a battery pack having a built-in flexible printed circuit board as described above, it is difficult to electrically connect the printed circuit board to the battery by directly welding it, and this is usually shown in Japanese Utility Model Application Laid-Open No. 62-57372. like,
A lead plate is led out so as to protrude from a flexible resin film (corresponding to a flexible printed board), and the lead plate is electrically connected to an electrode terminal of the battery by spot welding or the like.

Generally, as shown in FIG. 4 (a), a battery is provided with an insulating packing in a central through hole of a metal sealing lid 21.
The other pole terminal 23 is attached via the other end 22 and this sealing lid is welded to the opening of the battery outer can 24 also serving as the one pole terminal, or as shown in FIG. Since the sealing lid 26 also serving as the other terminal is fixed to the opening of the battery outer can 25 also serving as the terminal of the electrode via insulating packing, the positive and negative terminals are provided on the upper and lower end surfaces of the battery. There is a child. Then, on the end face of the battery where the sealing lid exists, the other terminal is exposed around the one terminal.

Since the positive and negative terminals are adjacent to each other on the end face of the battery, a short circuit is likely to occur. Therefore, an insulating member such as a paper cylinder or a heat-shrinkable tube attached to the outer peripheral face of the battery is used.
By covering the other pole terminal exposed around the one pole terminal, external short circuit is prevented from occurring.

However, in the above-described battery pack, FIG.
As shown in (2), when the lead plate 28 derived from the flexible printed board 27 is connected to the electrode terminals of the battery 29,
The lead plate 28 is directly opposed to the end face of the battery pack, and when an impact or the like is applied to the battery pack, the edge portion of the lead plate 28 may damage the insulating member 29 covering the other pole and cause a short circuit. is there.

[0007]

SUMMARY OF THE INVENTION The present invention is intended to prevent the above-mentioned external short circuit of a battery in a battery pack having a built-in flexible printed circuit board.

[0008]

SUMMARY OF THE INVENTION The battery pack of the present invention comprises:
A battery group including a plurality of batteries and a flexible printed board are housed in a case, and a cutout or a hole is provided in the board, and a lead plate is attached to the board in a state of being bridged to the cutout or the hole. And connecting the lead plate to the electrode terminals of the battery group by welding.

[0009]

When a notch or a through hole is provided in a flexible printed circuit board and a lead plate is mounted on the substrate so as to bridge the notch or the through hole, the lead plate is mounted as compared with a case where the lead plate is mounted so as to protrude from the substrate. And the lead plate can be prevented from protruding from the substrate. Further, the flexible printed board is flexible and can be easily bent, and the lead plate mounted on the board can be easily opposed to and connected to the electrode terminal of the battery.

When the lead plate is mounted on the substrate as described above, it is not necessary to bend the lead plate from the side surface to the end surface of the battery as in the related art, and to lead out the other electrode terminal existing around the end surface of the battery. The external short circuit of the battery can be prevented without damaging the coated insulating member.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below.

FIG. 1 is an exploded perspective view of a battery pack according to the present invention.
FIG. 2 is a perspective view showing a state before the flexible printed circuit board is mounted on the battery group, and FIG. 3 is a perspective view showing a state where the flexible printed circuit board is mounted on the battery group.

In the drawing, reference numeral 1 denotes a prismatic battery whose side peripheral surface is covered with an insulating member 2 made of a heat-shrinkable tube. The electrode terminals exposed on the end surfaces of adjacent batteries are juxtaposed so as to be terminals of different polarities. Make up a group. A breaker 3 is arranged between the batteries of the prismatic battery 1, and its terminals 4, 4 are spot-welded to the electrode terminals of the adjacent batteries, and the batteries 1 constituting the battery group are connected in series by a metal plate 5. It is connected.

Reference numeral 6 denotes a flexible printed circuit board, and a field effect transistor (FET) 7 is provided at one end of its surface.
A surface mount component comprising a diode 7, a diode 8, 8, a thermistor 9, and a resistor 10, 10 is mounted on a charging terminal 11 of the battery pack near the other end by reflow soldering. And, inside the substrate 6 spaced from the charging terminal 11,
A pair of discharge terminals 12 are similarly mounted.

The substrate is provided with connecting portions 13 for connection to a battery group so as to protrude from the substrate 6, and a notch portion 14 is provided at the tip of the connecting portion 13. A lead plate 15 is soldered to the connection portion 13 so as to bridge the gap. By bending the dashed portions A and B of the substrate 6, the lead plate 15 can be easily opposed to the electrode terminals of the battery 1 serving as the terminals of the battery group and spot-welded. And the flexible printed circuit board 6 are electrically connected.

When mounting the flexible substrate 6 and the battery group, the vicinity of the portion of the substrate 6 on which the surface mount components were mounted was bent and the breaker 3 was interposed to form the battery 1 between the batteries 1. The surface mount component is inserted into the space 16. Next, the battery group, the breaker 3 and the printed circuit board 6 are housed in a battery case composed of an upper case 17 and a lower case 18, and the charging terminal 11 mounted on the flexible substrate 6 is attached to a standing piece 19 And the discharge terminal 12 is exposed from the opening 20 provided on the bottom surface of the lower case 18 to constitute the battery pack of the present invention.

In the battery pack constructed as described above, the lead member for electrically connecting the substrate and the battery group can prevent the insulation member around the end face of the battery from being damaged, eliminate external short circuit of the battery, and improve reliability. I do.

In the above embodiment, the notch is provided at the connection portion of the substrate, and the lead plate is attached so as to bridge the notch. However, a through hole is provided at the connection portion instead of the notch. The same effect can be obtained even if a lead plate is attached so as to bridge the through holes.

[0019]

According to the battery pack of the present invention, a notch or a hole is provided in a flexible printed board, and a lead plate is attached to the board in a state of being bridged to the notch or the hole.
Since the electrodes are connected to the electrode terminals of the battery group by welding, the edge of the lead plate can be prevented from damaging the insulating member that insulates the periphery of the battery end face, eliminating external short-circuiting of the battery and reducing reliability. Can be improved.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a battery pack according to the present invention.

FIG. 2 is a perspective view showing a state before a flexible printed circuit board is mounted on a battery group in the present invention.

FIG. 3 is a perspective view showing a state in which a flexible printed circuit board is mounted on a battery group in the present invention.

FIGS. 4A and 4B are perspective views of a battery.

FIG. 5 is a perspective view showing a state in which a flexible printed circuit board is mounted on a battery group in a conventional battery pack.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Battery 2 Insulating member 6 Flexible printed circuit board 15 Lead plate 17 Upper case 18 Lower case

Claims (1)

(57) [Scope of request for utility model registration] 1. A battery group comprising a plurality of batteries and a flexible printed board are housed in a case, the board having a notch or a hole, and a lead plate bridging the notch or the hole. Wherein the lead plate is connected to the electrode terminals of the battery group by welding.