JP2000277163A - Protective circuit module of rechargeable battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a protective circuit module of a rechargeable battery which allows reductions in the size, weight, and manufacturing cost of a rechargeable battery pack. SOLUTION: In a protective circuit module for a rechargeable battery in which a first conductor plate electrically connected to the rechargeable battery and a terminal block 3 with a second conductor plate disposed thereon as a terminal for electrical connection to the first conductor plate are mounted on a circuit board 1, a conductor plate 4a comprising the first and second conductor plates integrated together is provided. Thus, the need for a mounting space to mount the conductor plates on the circuit board and a space to arrange a wiring pattern for electrically connecting the conductor plates together is eliminated and the circuit board 1 can be miniaturized, so that a rechargeable battery pack can be miniaturized and made lighter in weight.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a protection circuit module for a rechargeable battery.

[0002]

2. Description of the Related Art For example, a rechargeable battery pack such as a lithium ion battery has a built-in protection circuit for the purpose of preventing overcharge.

As shown in FIG. 2, a conventional protection circuit module constituting such a protection circuit includes a substrate body 51a.
And a protruding portion 51 protruding from a corner of the substrate body 51a.
b, and the circuit board 51
One end of conductive plates 52 and 53 electrically connected directly or through another conductor to an anode or a cathode of a lithium ion battery (not shown) as a rechargeable battery is mounted thereon by soldering or the like. I have. Circuit board 51
On the top, various electronic components (not shown) constituting the terminal block 54 and the protection circuit are mounted.
A wiring pattern (not shown) is formed. Terminal block 5
4 is provided with conductor plates 54a to 54d constituting terminals for inputting and outputting power to and from the outside of the rechargeable battery pack.

[0004] The conductor plate 52 is electrically connected directly to the conductor plate 54 a via a wiring pattern on the circuit board 51, and the conductor plate 53 is mounted on the circuit board 51 or the wiring pattern on the circuit board 51. It is electrically connected to the conductor plate 54d via a field effect transistor (not shown) or the like. That is, the conductor plate 52 constitutes a first conductor plate electrically connected to the rechargeable battery, and the conductor plate 54a
It constitutes a second conductor plate electrically connected to the first conductor plate.

However, in such a conventional structure, the conductor plate 52 is connected to the circuit board 51 by soldering or the like, although the conductor plate 52 and the conductor plate 54a are electrically connected directly. Since the conductor plate 52 and the conductor plate 54a are connected via the wiring board on the circuit board 51, an extra space is required for mounting the conductor plate 52 and arranging the wiring pattern, and the circuit board 51 is large. As a result,
This hinders miniaturization and weight reduction of the rechargeable battery pack. In addition, an operation of connecting the conductor plate 52 to the circuit board 51 is necessary, which hinders a reduction in manufacturing cost.

[0006]

DISCLOSURE OF THE INVENTION The present invention has been conceived in view of the above circumstances, and is a protection circuit module for a rechargeable battery capable of reducing the size and weight of the rechargeable battery pack and reducing the manufacturing cost. To provide

In order to solve the above problems, the present invention provides:
The following technical measures have been taken:

According to a first aspect of the present invention, a circuit board includes a first conductor plate electrically connected to a rechargeable battery and a second conductor plate electrically connected to the first conductor plate. A rechargeable battery protection circuit module to which a terminal block provided as a terminal is mounted, wherein the rechargeable battery includes a conductor plate in which a first conductor plate and a second conductor plate are integrated. Is provided.

According to a preferred embodiment, the conductive plate is
One end is located on the terminal block, and the other end protrudes outward from the circuit board.

As described above, since the conductor plate in which the first conductor plate and the second conductor plate are integrated is provided, an installation space for attaching the first conductor plate to the circuit board and the first conductor plate and the second conductor plate are provided. Space for disposing a wiring pattern for electrically connecting to the conductor plate is not required, and the circuit board 51 can be reduced in size. As a result, the size and weight of the rechargeable battery pack can be reduced. In addition, there is no need to attach the first conductor plate to the circuit board, and the manufacturing cost can be reduced.

[0011] Other features and advantages of the present invention will become more apparent from the detailed description given below with reference to the accompanying drawings.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be specifically described below with reference to the drawings.

FIG. 1 is a schematic configuration diagram of a protection circuit module for a rechargeable battery according to the present invention. In the corner on the circuit board 1, an anode or a lithium ion battery (not shown) as a rechargeable battery is provided. One end of a conductor plate 2 that is electrically connected to the cathode directly or via another conductor is attached by solder or the like. The conductor plate 2 is made of, for example, a nickel plate. On the circuit board 1,
Further, various electronic components (not shown) such as a field effect transistor constituting a terminal block 3 and a protection circuit are attached, and a wiring pattern (not shown) is formed. The terminal block 3 has conductor plates 4a to 4d constituting terminals for inputting and outputting power to and from the outside of the rechargeable battery pack.
Are arranged. Field effect transistors and ICs (integrated circuits) constituting the protection circuit are mounted on the circuit board 1 in a bare chip state. That is, a field-effect transistor or an IC is mounted on a chip-on-board.

The conductor plate 4a is an elongated rectangle, and has a longer length than the other conductor plates 4b to 4d.
And the other end protrudes outward from above the circuit board 1. The conductor plate 4a is, for example, a nickel plate plated with gold, and is electrically connected to an anode or a cathode of a lithium ion battery (not shown) as a rechargeable battery directly or through another conductor. That is, the conductor plate 4a forms a conductor plate in which the first conductor plate and the second conductor plate are integrated. The conductor plate 2 is electrically connected to the conductor plate 4d via a field effect transistor mounted on the circuit board 1 or a wiring pattern formed on the circuit board 1.

According to such a protection circuit module for a rechargeable battery, the conventional conductor plate 52 and conductor plate 54a shown in FIG.
And the conductor plate 4a shown in FIG. 1 is provided.
A space for mounting the conductor plate 52 on the circuit board 51 and a space for disposing a wiring pattern for electrically connecting the conductor plate 52 and the conductor plate 54a are not required. As a result, the circuit board 1 can be downsized. The size and weight of the rechargeable battery pack can be reduced. Further, the operation of attaching the conductor plate 52 to the circuit board 51 becomes unnecessary, and the manufacturing cost can be reduced.

In the circuit board 1 shown in FIG.
Unlike the circuit board 51 shown in FIG. 2, the projecting portion 51b is not provided and the area is dramatically reduced. This is because the circuit board 51 and the conductor plate 54a are integrated as described above. In addition to the effect obtained by providing the plate 4a, the mounting area of the electronic components is greatly reduced by mounting the field effect transistors and ICs constituting the protection circuit on a chip-on-board.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a protection circuit module for a rechargeable battery according to the present invention.

FIG. 2 is a schematic configuration diagram of a conventional protection circuit module for a rechargeable battery.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Circuit board 2 Conductor plate 3 Terminal block 4a-4d Conductor plate

Claims (2)

[Claims] A first conductive plate electrically connected to a rechargeable battery, and a terminal board on which a second conductive plate electrically connected to the first conductive plate is provided as a terminal. A protection circuit module for a rechargeable battery, comprising: a conductor plate in which the first conductor plate and the second conductor plate are integrated. 2. The conductor plate has one end positioned on the terminal block and the other end protruding outward from the circuit board.
A rechargeable battery protection circuit module according to claim 1.