JPH0729739U - Battery pack - Google Patents

Abstract

(57) [Abstract] [Purpose] To securely and stably fix the terminal board fixed to the flexible board to the correct position of the case. Prevent contact failure of the terminal board. [Constitution] In the battery pack, a flexible board 2 is built in a case 1, and a terminal board 3 is fixed to the flexible board 2. The terminal plate 3 is exposed to the outside of the case 1 through a terminal window 4 opened in the case 1. A terminal holder 5, which is a separate component from the case 1, is arranged between the terminal plate 3 of the flexible substrate 2 and the built-in battery. The terminal holder 5 to which the terminal plate 3 is connected is fixed to the case 1. [Effect] Since the terminal plate 3 of the flexible substrate 2 is fixed to the case 1 by the terminal holder 5 instead of the battery, the terminal plate 3 is accurately and stably fixed in a fixed position.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to a battery pack in which a terminal plate is provided in a case and a battery is placed inside.

[0002]

[Prior art]

 The battery pack is often formed into a rectangular shape that fits the shape of the mounting part when it is mounted on an electric device to be used. On the other hand, the batteries built into the battery pack are known to be cylindrical or rectangular. When a rectangular battery is stored in the rectangular battery pack, the shape of the battery pack and the shape of the built-in battery are both rectangular, so extra space is required compared to the case where a cylindrical battery is built in. It is possible to construct a battery pack without making a battery. The battery pack containing such a prismatic battery has a high ratio of the volume of the built-in battery to the volume of the battery pack, that is, the density of the electric capacity in the volume of the whole battery pack is high. Therefore, it is possible to reduce the size of the battery pack while increasing the electric capacity of the battery pack, and it is suitable as a power source for portable electric devices that require miniaturization. As described above, the battery pack with the rectangular battery does not create an extra space inside, so it is better to use a lead wire or the like for electrical connection between multiple batteries and the built-in elements. , A flexible substrate is often used.

FIG. 1 shows a battery pack having a flexible substrate. The battery pack shown in this figure incorporates the flexible substrate 2 shown in FIG. The flexible base plate 2 of FIG. 2 has a terminal plate 3 fixed to the left end. As shown in FIG. 1, the portion to which the terminal plate 3 is fixed is along the side surface of the prismatic battery 16 and is bent so as to be along the surface of the battery 16. The flexible substrate 2 is built in the case 1 with the terminal plate 3 along the side surface of the battery.

[0004]

In the battery pack having this structure, the battery is arranged on the back surface of the terminal plate to position the terminal plate. For this reason, there is a drawback that the fixed position of the terminal plate is also displaced due to dimensional variation of the battery or when the battery moves within the case. Furthermore, when the battery moves inside the case, the terminal board also moves with it. The terminal board connected to the flexible board is more easily deformed than the rigid printed board. A battery pack that does not have a flexible flexible board that can be fixed securely will have many contact failures on the terminal board when it is set in electrical equipment. This is because the terminal board will move and will not be surely contacted with the contacts of electrical equipment.

Contact failure is an extremely troublesome failure for a battery pack. This is because the battery pack cannot be used while the battery can be used normally. In particular, the electric device containing the microcomputer backs up the memory with a battery, so even if the power is temporarily turned off, the information stored in the RAM is erased, which is a serious problem. To make matters worse, poor battery contact often occurs intermittently instead of constantly, but even if the power is turned off intermittently, electronic devices with a built-in microcomputer The information in the memory is erased, resulting in a serious adverse effect on use. It is very important to reduce the contact failure of the battery pack to a completely empty state.

The present invention has been developed for the purpose of achieving this, and an important purpose of the present invention is to securely and stably fix a terminal board fixed to a flexible substrate to an accurate position of a case. Another object of the present invention is to provide a battery pack that minimizes contact failure of the terminal board.

[0007]

[Means for Solving the Problems]

 The battery pack of the present invention has the following structure in order to achieve the above object. The battery pack has a case 1 and a flexible substrate 2 incorporated therein. A terminal board 3 is fixed to the flexible board 2. The terminal plate 3 is exposed to the outside of the case 1 through a terminal window 4 opened in the case 1 so that the battery pack can be connected to the terminals of the electric device when the battery is set in the electric device.

Further, in the battery pack of the present invention, in order to stably fix the terminal plate 3 of the flexible substrate 2 to an accurate position regardless of the position of the battery, the battery pack is provided between the terminal plate 3 and the built-in battery. A terminal holder 5, which is a separate component from the case 1, is arranged. The terminal plate 3 is connected to the terminal holder 5, and the terminal holder 5 is fixed to the case 1. In the pack battery having this structure, the terminal board 3 of the flexible substrate 2 is fixed to the case 1 via the terminal holder 5.

[0009]

[Action]

 The battery pack of the present invention does not hold the terminal plate 3 of the flexible substrate 2 with the battery unlike the conventional battery pack. The terminal board 3 of the flexible substrate 2 is fixed to the case 1 via a terminal holder 5 arranged between the terminal board 3 and the built-in battery. The terminal plate 3 is connected to the terminal holder 5, and the terminal holder 5 is fixed to the case 1. The terminal plate 3 is fixed to the case 1 via the terminal holder 5 instead of the battery. The terminal holder 5 is a component that is molded separately from the case 1, and is fixed at a fixed position of the case 1.

The battery pack of FIGS. 3 to 5 showing a preferred embodiment of the present invention has a terminal holder 5 disposed on the back surface of the terminal plate 3 of the flexible substrate 2. The back surface holder 5B is connected to the front surface holder 5A to sandwich the terminal plate 3, the terminal holder 5 sandwiching the terminal plate 3 is fixed to the case 1, and the terminal plate 3 is connected to the case 1. In this way, the battery pack in which the terminal plate 3 is connected to the terminal holder 5 formed separately from the case 1 and the terminal holder 5 is fixed to the case 1 to fix the terminal plate 3 in a precise position. Can be securely fixed.

[0011]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. However, the embodiments described below exemplify a battery pack for embodying the technical idea of the present invention, and the present invention does not specify the structure of the battery pack as follows.

Further, in this specification, in order to facilitate understanding of the scope of claims for utility model registration, the numbers corresponding to the members shown in the examples are referred to as "column for claims for utility model registration" and "column for action". , And "members for solving the problems" are added. However, the members indicated in the claims for utility model registration are not specified as the members of the embodiment.

The battery pack shown in FIGS. 3 and 4 has a battery and a flexible substrate 2 built in a case 1, and a terminal plate 3 is fixed to the flexible substrate 2. The flexible substrate 2 is provided with electronic components inside the battery pack, and is connected with a temperature element such as a thermistor or PTC (not shown). Further, the wiring of the flexible substrate 2 is connected to the electrodes of the battery contained therein.

Furthermore, as shown in FIG. 4, the wiring of the flexible substrate 2 is connected to the terminal board 3 by reflow soldering. The terminal plate 3 is a metal plate that is thicker than the conductive metal foil of the flexible substrate 2, and has a surface plated with gold to prevent contact failure. In the flexible substrate 2 shown in FIG. 4, four terminal plates 3 are connected, and the connecting portions of the terminal plates 3 are bent 90 degrees with a predetermined radius of curvature. In addition to the output terminals of the built-in battery, the four terminal plates 3 also serve as signal terminals for transmitting the status of the built-in battery detected by the temperature element such as the thermistor to electrical equipment.

The terminal board 3 of the flexible board 2 is sandwiched and fixed to two terminal holders 5. The terminal holder 5 is composed of a back surface holder 5B located on the back surface of the terminal board 3 and a front surface holder 5A located on the front surface of the terminal board 3. The back surface holder 5B and the front surface holder 5A are molded plastic products, and the terminal plate 3 is sandwiched and connected at the periphery.

The front holder 5 A has four small windows 6 arranged side by side for opening the four terminal plates 3 on the front surface of the case 1. The rear surface is provided with a recess 7 into which the terminal plate 3 of the flexible substrate 2 and the back surface holder 5B can be fitted. Further, on the upper surface and the lower surface of the front surface holder 5A, the protrusions 8 of the case 1 are fitted to form grooves 9 for fixing the terminal holder 5 to the case 1. Further, on both side surfaces of the front surface holder 5A, there are provided ridges 10 which are fitted in grooves (not shown) of the case 1. The recess 7 provided on the back surface of the front holder 5A is designed to have substantially the same outer shape as that of the flexible substrate 2 provided with the terminal plate 3 so that the terminal plate 3 can be inserted without displacement.

The back holder 5B is formed in a box shape that can be fitted into the recess 7 provided on the back surface of the front holder 5A. The back surface holder 5B presses the back surface of the terminal board 3 to fix it in place. Therefore, there is a flat surface portion 11 for pressing the terminal plate 3 on the front surface, and a peripheral wall 12 that is connected to the inner surface of the front surface holder 5A is formed on the peripheral edge of the flat surface portion 11. The peripheral wall 12 of the back holder 5B has an opening end protruding outward, and the front holder 5A has a groove 13 at the opening edge of the recess 7 into which the protruding portion can be fitted.

In the terminal holder 5 shown in FIG. 4, the terminal plate 3 of the flexible substrate 2 is sandwiched and fixed by the front holder 5A and the rear holder 5B. In order to sandwich the terminal plate 3, the terminal plate 3 and the rear holder 5B are put in the recess 7 of the front holder 5A, the rear holder 5B is welded to the front holder 5A, and the terminal plate 3 is sandwiched. The front surface holder 5A and the rear surface holder 5B are connected by ultrasonic welding or by bonding with an adhesive material. Since the terminal holder 5 having this structure can be fixed by sandwiching the peripheral edge and the boundary of the terminal plate 3, there is a feature that the terminal holder 5 can be surely fixed.

However, in the battery pack of the present invention, the terminal holder 5 is not limited to the shape shown in this figure. As the terminal holder 5, as shown in FIGS. 6 and 7, a terminal holder 5 without a front holder can also be used. The terminal holder 5 without the front holder has a flat surface portion 11 for pressing the terminal plate 3 on the front surface, and a battery 16 is built in on the back surface. In the battery pack shown in this figure, four small terminal windows 4 are opened in the case 1 to expose the terminal plate 3 to the outside of the case 1.

The case 1 for fixing the terminal holder 5 has a terminal window 4 opened to expose the terminal plate 3 to the outside of the case 1. The terminal holder 5 is fixed to the terminal window 4. Since the front surface of the terminal plate 3 shown in FIG. 4 is sandwiched and fixed by the terminal windows 4, the size of the terminal windows 4 is set so that the terminal holder 5 can be inserted therein.

As shown in FIGS. 6 and 7, the battery pack using the terminal holder 5 without the front holder has four small terminal windows 4 opened to expose each terminal plate 3 to the outside of the case 1. Let out. The terminal holder 5 is provided with a ridge 14 at its rear end, and the ridge 14 is fitted into a groove 15 on the inner surface of the case 1 and fixed to the case 1.

[0022]

[Effect of device]

 The battery pack of the present invention has an excellent feature that the terminal plate fixed to the flexible board can be reliably and stably fixed at the correct position of the case, and the contact failure of the terminal plate can be minimized. A battery pack with a built-in flexible board has the advantage of being able to use the narrow space effectively for wiring, but since the flexible board is flexible and easily deformed, it is important to fix the terminal board firmly so that it does not move. is there. The battery pack of the present invention is fixed to a case through a terminal holder arranged between the terminal plate and the battery, instead of supporting the terminal plate of the flexible substrate with the battery as in the conventional case. Therefore, even if the battery moves inside the case or the position shifts, it can be securely fixed in the correct position via the terminal holder. Although the terminal holder is molded as a separate part from the case, fixing it in the exact position of the case is much easier than fixing the battery. Since the battery is a standard product, it cannot be made into an ideal shape that can be easily fixed to the case, but since the terminal holder is a component that fixes the terminal plate, it has an ideal shape to be fixed to the case. Because it can be molded into. Therefore, the terminal holder has a simple structure and can be securely fixed to the correct position of the case so as not to move. Since the terminal board is connected to the case via the terminal holder that is accurately fixed to the case, it can be fixed in a precise position so as not to move. The battery pack of this invention, which can stably fix the terminal plate so that it does not move to the correct position, has the feature of minimizing contact failures when it is set in electrical equipment. This is because the end plate can surely come into contact with the contacts of the electric device.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a conventional battery pack.

2 is a perspective view of a flexible substrate incorporated in the battery pack shown in FIG.

FIG. 3 is a perspective view of a battery pack according to an embodiment of the present invention.

FIG. 4 is an exploded perspective view of a flexible substrate and a terminal holder incorporated in the battery pack shown in FIG.

5 is a sectional view of a terminal plate portion of the battery pack shown in FIG.

FIG. 6 is a sectional view of a terminal plate portion of a battery pack according to another embodiment of the present invention.

FIG. 7 is a sectional view of a terminal plate portion of a battery pack according to another embodiment of the present invention.

[Explanation of symbols]

1 ... Case 2 ... Flexible board 3 ... Terminal board 4 ... Terminal window 5 ... Terminal holder 5A ... Front holder 5B ...
Back holder 6 ... Small window 7 ... Recessed portion 8 ... Convex strip 9 ... Groove 10 ... Convex strip 11 ... Flat portion 12 ... Peripheral wall 13 ... Groove 14 ... Convex strip 15 ... Groove 16 ... Battery

Claims (1)

[Scope of utility model registration request] 1. A flexible board (2) is built in a case (1), a terminal board (3) is fixed to the flexible board (2), and the terminal board (3) is opened in the case. Terminal window
In the battery pack exposed from (4) to the outside of the case (1), between the terminal board (3) of the flexible board (2) and the built-in battery,
The terminal holder (5), which is a separate component from the case (1), is installed, and by fixing the terminal holder (5) to which the terminal plate (3) is connected to the case (1), the terminal plate (3) The battery pack is characterized in that is fixed to the case (1) through a terminal holder (5).