JP2547797Y2 - 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 used as a backup power supply for a computer memory or a controller of an industrial robot, or as a main power supply for a sequencer or the like.

[0002]

2. Description of the Related Art As a battery pack of this type, Japanese Utility Model Application 2-1
The battery pack of JP 7940 is known. Further, the present applicant has previously proposed a vibration-proof type battery pack obtained by developing and improving the above-mentioned battery pack (Japanese Utility Model Application No. 2-106919).
issue). This means that all components such as batteries, protective resistors, diodes, etc. are soldered to the printed wiring board, and the mounted board is welded and fixed to a box-shaped plastic case so that each component moves freely in the case. This prevents the occurrence of connection failure and disconnection due to external vibration. An output lead wire is led out of the case, and a connector is attached to the end of the output lead wire.

[0003]

As described above, in a battery pack in which a battery, a printed circuit board, and the like are sealed in a plastic case, a very small amount of noise (obstructive radio waves) is generated from the battery and the printed circuit board. It is known to Depending on the mode of use of the battery, there is a possibility that data may be destroyed or a device malfunctions due to the generated noise, and countermeasures have been desired. It is known to use a cylindrical or ring-shaped ferrite core as a countermeasure against this kind of noise. For example, it is widely used in power cords and interface cables of electronic devices.

[0004] In the case of taking measures against noise using a ferrite core in a battery pack, an output lead wire derived from a case is wound several times around the inside and outside of a cylindrical wall of the ferrite core according to a conventional general usage. . That is, the ferrite core is disposed in the middle of the output lead wire. However, with such a core arrangement, the ferrite core can move freely within the range of the output lead wires when the battery pack is attached to the outer case of the computer or the circuit board.For example, when the circuit is inspected, the ferrite core is mounted on the circuit board. Short-circuiting may occur due to contact with components or wiring patterns. Further, since the connector is small and difficult to operate, the connector is often pulled out while holding the ferrite core, and disconnection or poor connection is likely to occur at the connection portion of the output lead wire with the connector.

An object of the present invention is to provide a highly reliable battery pack capable of eliminating data destruction and equipment malfunction caused by noise, a circuit short circuit caused by contact with another ferrite core, and an inappropriate connector. It is to eliminate the induction of the operation.

[0006]

According to the invention, a printed circuit board 5 on which at least a battery 2 and an output lead wire 6 are mounted is sealed in a protective case 1 and is fixed by welding to the inner wall of the case. Outlet 1 provided on the peripheral wall of case 1
0, the output lead wire 6 is led out of the case, and assuming a battery pack having a connector 7 attached to its end,
A cylindrical ferrite core 16 is disposed in a space in the case between the printed wiring board 5 and the outlet 10, and a middle portion of the output lead wire 6 is wound around the inner and outer surfaces of the cylindrical wall of the ferrite core 16 to reduce the noise filter F. Is characterized in that

[0007]

The noise filter F is arranged inside the protective case 1 to prevent the ferrite core 16 from moving with the output lead wire 6 and coming into contact with other objects, and to prevent the ferrite core 16 from coming into contact with other objects.
This is for avoiding the operation of pulling out while holding the ferrite core 16.

[0008]

As described above, according to the battery pack of the present invention in which the ferrite core 16 is disposed inside the protective case 1 and the noise filter F is formed inside the case, the battery pack is connected to the auxiliary power supply of the computer memory or the like. In a state where the ferrite core 16 is applied to the battery pack, the ferrite core 16 can be prevented from contacting electronic components and wiring patterns around the battery pack,
In addition, it is possible to prevent an inappropriate connector operation while holding the ferrite core 16. Therefore, the addition of the noise removal function to the battery pack having the vibration proof function can be easily handled in the same manner as the conventional battery pack, while improving the reliability in the applied state.

[0009]

1 to 3 show an embodiment of a battery pack according to the present invention. In FIG. 1, a battery pack includes a rectangular box-shaped protective case 1 and two batteries 2 and 2 housed therein.
A diode 3, a resistor 4, a printed wiring board (hereinafter simply referred to as a board) 5 to which these members are attached,
It comprises a noise filter F, an output lead wire 6 led out of the protection case 1, a connector 7, and the like.

The protective case 1 comprises a case body 1a having an upper surface opened and a case lid 1b for closing the opening.
Both are made of flame-retardant ABS resin. As shown in FIGS. 1 and 3, the case main body 1a has two support projections 9 protruding from the inner bottom in parallel with the long side, and a conductor for the output lead wire 6 near one short side. An outlet 10 is provided, and a stop piece 11 is provided on the inner bottom near the corner where the outlet 10 is located.

The substrate 5 is formed of an insulating plate obtained by solidifying glass fiber with epoxy resin, and a wiring pattern is printed on the lower surface thereof. A through hole is provided accordingly. Further, one end of one long side of the substrate 5 is cut off in a U-shape to form an engaging portion 14 corresponding to the play stopper 11 of the case main body 1a. The engaging portion 14 serves as a mark for specifying a mounting direction and a posture of the substrate 5, and also serves to improve workability at the time of assembling.

The battery 2 is a cylindrical lithium battery having a lead pin 2a on the positive electrode side and a lead terminal 2b on the negative electrode side. These lead pins 2a and lead terminals 2b are
The battery 2 is inserted into the through hole of the substrate 5 from the upper surface side and soldered to the wiring pattern on the lower surface side, so that the battery 2 is electrically connected to other members and integrated with the substrate 5. The two diodes 3 and the resistor 4 are similarly soldered to the substrate 5. In FIG. 1, the output lead wire 6 has a play piece 1
1 is soldered to the board mounting surface between the side wall on which the battery 1 is provided and the battery 2, that is, the parts mounting surface 5 a secured along the longitudinal direction of the battery 2.
Are soldered to the parts mounting surface 5a.

In order to prevent the leakage of noise generated from the battery 2 or the substrate 5, a noise filter F is provided inside the protective case 1. As shown in FIGS. 1 and 2, the noise filter F is formed by winding a middle part of the output lead wire 6 around the inner and outer surfaces of the cylindrical ferrite core 16. The ferrite core 16 is arranged at the inner corner of the case between the play stopper 11 and the outlet 10 with the cylinder axis being substantially vertical, and a part of the bottom wall is supported by the play stopper 11. . Thus, when the noise filter F is arranged facing the inside of the outlet 10, when the output lead wire 6 is pulled outward of the case, the ferrite core 16 contacts the inner wall of the case and opposes an external force. Therefore, it is possible to prevent external force from acting on the soldered portion of the output lead wire 6. Further, the movement of the ferrite core 16 is suppressed by the inner corner wall of the case, the battery 2, and the play stopper 11, and the movement of the ferrite core 16 is restricted by the output lead wire 6 wound around the cylindrical wall.
Even under conditions where external vibrations are constantly acting,
The position can be maintained.

The mounted board 5 to which all the members are soldered is housed in the case body 1 a in a state in which the engaging portions 14 are closely engaged with the play pieces 11, and the lower surface of the board 5 is supported by the support projections 9. Then, ultrasonic welding is performed to integrate with the protective case 1. Next, the case lid 1b is put on the case main body 1a, and ultrasonic welding is similarly performed to integrate them.

The position of the stop piece 11 is shifted, and a compartment for accommodating the noise filter F can be formed between the stop piece 11 and the inner corner wall of the case. The protective case 1 may contain only one battery 2 in some cases. When the diode and the protection resistor are provided on the main circuit side, the diode 3 and the resistor 4 mounted on the substrate 5 can be omitted.

[Brief description of the drawings]

FIG. 1 is a plan view showing the internal structure of a battery pack by breaking a case lid.

FIG. 2 is a sectional view taken along line AA in FIG.

FIG. 3 is a sectional view taken along line BB in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Protective case 2 Battery 3 Diode 4 Resistance 5 Printed wiring board 6 Output lead wire 7 Connector 10 Outlet 16 Ferrite core F Noise filter

Claims (1)

(57) [Scope of request for utility model registration] A printed wiring board on which at least a battery and an output lead wire are mounted is sealed in a protective case, and is fixed to an inner wall of the case by welding. A battery pack in which the output lead wire (6) is led out of the case from an outlet (10), and a connector (7) is attached to the end of the output lead wire (6). A battery filter in which a noise filter F is formed by arranging a ferrite core 16 and winding a middle part of the output lead wire 6 around the inner and outer surfaces of a cylindrical wall of the ferrite core 16.