JP2003197270A - Protection circuit module and battery pack including the same - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To enable a battery pack to be assembled with good workability without using a conductor plate requiring care for spot welding and avoiding contact with a battery. A protection circuit module provided by the present invention is formed on a substrate, an electronic component mounted on the substrate and constituting a protection circuit, and formed on the substrate so as to surround the electronic component. A protection circuit module comprising:
One or more spring receiving surfaces are formed.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a protection circuit module for a rechargeable battery and a battery including the protection circuit module.

A battery pack used as a rechargeable power source for a mobile terminal such as a mobile phone is provided with a protection circuit for preventing overcharge and overdischarge of a rechargeable battery. This protection circuit is provided in a modular form for convenience of assembling the battery pack.

Such a conventional protection circuit module 10
FIG. 6 schematically shows an example in which the battery pack 30 is configured by loading the battery pack 30 together with the rechargeable battery 40 into the case 20.

The protection circuit module 10 is mounted on one surface of an insulating substrate 11 made of glass epoxy or the like in such a manner that an electronic component for forming the protection circuit is wrapped inside a sealing mold body 13 while the protection circuit is filled. It has a basic structure in which one ends of the conductor plates 14 and 15 for connecting to the battery 40 are connected to the substrate 11. The other ends of the conductor plates 14 and 15 are connected to the positive pole 41 or the negative pole 42 arranged on the outer surface of the rechargeable battery 40 by spot welding or the like. Figure 6
In the example shown in (1), a plurality of terminal portions 16 are formed on the surface of the substrate 11 opposite to the side on which the mold body 13 is formed. This terminal portion 16 is used for the protection circuit module 1
When 0 is loaded in the case 20, it plays a role of exposing the battery pack 30 and the main body of the mobile terminal device to the outside through the window hole 21 opened in the case 20. Then, a charging current from the charger is supplied to the battery pack 30 or a discharging current from the battery pack 30 is supplied to the device body via the terminal unit 16 through the device body.

[0005]

By the way, the rechargeable battery 40
Generally has a rectangular outer shape with a predetermined thickness, and a positive pole 41 (in some cases, a negative pole; hereinafter the same) is arranged in a protrusion shape at the center of one end face in the longitudinal direction, while a negative pole. (Positive pole in some cases. Same below)
However, it is generally constituted by the entire conductor skin except the positive pole. Then, the conductor plate 14 to be connected to the protruding positive electrode 41 is, as shown in FIG.
It is necessary to make multiple bends with respect to 1 and then spot weld to the above-mentioned protruding positive electrode.

In this case, since the rechargeable battery 40 has a negative electrode on the entire skin except for the protruding positive electrode, the conductor plate to be connected to the positive electrode should not be carelessly short-circuited to the rechargeable battery surface. You need to pay for it. Such treatment is generally performed by interposing a spacer.

As described above, in the conventional battery pack of this type, since the protection circuit module and the rechargeable battery are connected by the conductor plate, the conductor plate is prevented from accidentally coming into contact with the outer skin of the rechargeable battery. This is a troublesome work itself, and the spot welding of the conductor plate to the rechargeable battery leads to an increase in the cost of the battery pack.

The present invention has been conceived under the circumstances as described above, and does not require the use of a conductor plate that requires spot welding or contact avoidance with the battery, and has good workability. The challenge is to be able to assemble the pack.

[0009]

DISCLOSURE OF THE INVENTION In order to solve the above problems, the present invention adopts the following technical means.

That is, the protection circuit module provided by the first aspect of the present invention includes a substrate, an electronic component mounted on the substrate to form a protection circuit, and the electronic component wrapped around the electronic component. A protective circuit module comprising a molded body formed on the substrate,
One or more spring receiving surfaces are formed on one surface of the substrate.

In a preferred embodiment, the spring receiving surface is formed by a conductor pad formed on a substrate for connecting the protection circuit to a rechargeable battery.

In a preferred embodiment, the spring receiving surface is formed so as to face the bottom of the spring receiving hole opened in the thickness direction of the mold body.

Further, in a preferred embodiment, one end of a spring formed by a conductor coil is connected to the spring receiving surface.

The battery pack provided by the second aspect of the present invention is a battery pack in which a rechargeable battery and a protection circuit module are loaded in a case, and the protection circuit module is provided by the first aspect of the present invention. The protection circuit module is provided, and in the protection circuit module, the surface on which the spring receiving surface is formed faces the one surface of the rechargeable battery, and the one surface of the rechargeable battery and the spring receiving surface are Between them, a spring is interposed in a compressed state.

In short, the present invention is a conventional battery pack of this type in which the conductor plate connecting the protection circuit module and the rechargeable battery is preferably replaced with a spring such as a compression coil spring. By inserting this spring between the protection circuit module and the rechargeable battery in the compressed state,
A process such as spot welding becomes unnecessary, the size of the rechargeable battery can be easily changed, and connection failure due to impact can be prevented.

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

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be specifically described below with reference to FIGS. In these figures, members or portions equivalent to those of the conventional example shown in FIG. 6 are designated by the same reference numerals.

FIG. 1 schematically shows an embodiment in which the protection circuit module 10 according to the present invention is loaded in a case 20 together with a rechargeable battery 40 to form a battery pack 30.

This protection circuit module 10 is mounted on one surface of an insulating substrate 11 made of glass epoxy or the like in such a manner that an electronic component 12 for forming a protection circuit is wrapped in a sealing mold body 13 while being mounted. It has a basic structure in which spring receiving surfaces 14 and 15 formed by conductor pads are formed on the surface on which the body 13 is formed.

More specifically, the substrate 11 is a rechargeable battery 40.
It has a strip plate shape having a width corresponding to the thickness of the electronic component 12 on one side, and the necessary electronic components 12 to be wrapped in the mold body 13 are mounted on the other side. The part 16 is formed. The conductor pad 14,
Reference numeral 15 is a conductor pad for connecting the protective circuit to the positive electrode 41 and the negative electrode 42 of the rechargeable battery. In the embodiment shown in the figures, the first
The first conductor pad 14 and the second conductor pad 15 formed so as to face the bottom surface of the hole 17 formed in the thickness direction from the upper surface of the mold body 13 are formed in the substantially central portion of the substrate 11. There is. First conductor pad 14
Corresponds to the winding diameter of the compression coil spring 51 described later,
It has a size and shape necessary and sufficient for receiving this spring. Further, the hole 17 formed in the mold body 13 has an inner diameter corresponding to the winding diameter of the compression coil spring 52 described later so that one end of the coil spring 52 can be properly accommodated and held. The second conductor pad 15 facing the bottom of the hole 17 is also formed so as to properly receive the coil spring.

The protection circuit module 10 provided with the above structure is assembled with the case 20 or the rechargeable battery 40 as shown in FIGS. 1 and 2, for example, to form a battery pack 30. That is, the protection circuit module 10 has one surface side, that is, the mold body 13.
And the first and second conductor pads 14 and 15 are formed so that the surface on which the first and second conductor pads 14 and 15 are formed faces the one end surface 40a of the rechargeable battery 40, and the first conductor pad 14 and one end surface of the rechargeable battery 40 are disposed. Compression coil springs 51 and 52 made of a conductive material are respectively interposed between the second conductor pad 15 and the protruding electrode 41 at the center of one end surface of the rechargeable battery 40 in a compressed state. .

In the above structure, the substrate 11 and the rechargeable battery 4
The electrical continuity with 0 is reliable. Further, since the compression coil springs 51 and 52 are elastically contacted with each other, it is possible to omit the step of spot welding or the like to the rechargeable battery 40, and for the same reason, the compression coil springs 51 and 52 are charged with the protection circuit module 10 by an impact or the like. There is no fear of causing poor conduction with the battery 40. In addition, since the compressed state can be changed, even if the size of the rechargeable battery 40 is changed without changing the size of the case, a good conduction state can still be ensured.

The compression coil springs 51 and 52 described above are used.
May or may not be attached to the substrate 11 of the protection circuit module 10. However, if the compression coil springs 51, 52 are attached to the substrate 11, one end face is pressed against each compression coil spring 51, 52 to compress the coil springs, as shown in FIGS. It is convenient that the rechargeable battery 40 can be assembled into the case by a simpler operation of sliding the rechargeable battery 40 forward and fitting the rear part into the case 20. Further, this makes it easy to replace only the rechargeable battery 40.

As a method of attaching the compression coil springs 51 and 52 to the substrate 11, for example, soldering is applied to the first conductor pad 14 and the molding body 13 is attached to the second conductor pad 15 as described above. A method of holding it in the hole 17 can be considered.

Of course, the scope of the present invention is not limited to the above-mentioned embodiments, and all modifications within the scope of matters described in each claim are included in the scope of the present invention. The shape of the substrate, the position and number of terminal portions, or the presence or absence of a terminal block in place of the terminal portions for forming the protection circuit module does not have any influence on the scope of the present invention.

Further, in the above embodiment, the spring is used as a member for conducting the protection circuit to both the positive pole and the negative pole of the rechargeable battery. However, the spring having the above construction is used only for conducting to one pole. It is of course included in the scope of the invention of the present application to use the above-mentioned conductive plate for conducting to the other pole.

Further, the form of the spring is not limited to the coil spring, and any spring may be used as long as it is a compression spring such as a leaf spring or a disc spring.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing an embodiment of a battery pack according to the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a perspective view of a protection circuit module used in the battery pack as viewed from the other surface side.

FIG. 4 is an exploded perspective view of a protection circuit module used in the battery pack, viewed from one surface side.

FIG. 5 is an explanatory diagram of an example of a method of assembling the battery pack.

FIG. 6 is an explanatory diagram of a conventional example.

[Explanation of symbols]

10 Protection circuit module 11 board 12 Electronic components 13 Mold body 14 Conductor pad (spring receiving surface) 15 Conductor pad (spring receiving surface) 16 terminals 17 holes 20 cases 21 window hole 22 Lid 30 battery pack 40 rechargeable battery 41 plus pole 42 minus pole 51 compression coil spring 52 Compression coil spring

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 5H030 AA03 AA04 AS06 AS14                 5H040 AA03 AS13 AT02 AY08 CC01                       CC24 CC33 DD02 DD08

Claims (5)

[Claims] 1. A protection circuit module including a substrate, an electronic component mounted on the substrate to form a protection circuit, and a mold body formed on the substrate so as to surround the electronic component. A protection circuit module, wherein one or more spring receiving surfaces are formed on one surface of the substrate. 2. The protection circuit module according to claim 1, wherein the spring receiving surface is formed by a conductor pad formed on a substrate for connecting the protection circuit to a rechargeable battery. 3. The protection circuit module according to claim 1, wherein the spring receiving surface is formed so as to face a bottom portion of a spring receiving hole opened in the thickness direction of the mold body. 4. The protection circuit module according to claim 1, wherein one end of a spring formed by a conductor coil is connected to the spring receiving surface. 5. A battery pack in which a rechargeable battery and a protection circuit module are loaded in a case, wherein the protection circuit module is the protection circuit module according to claim 1. In the module, the surface on which the spring receiving surface is formed faces the one surface of the rechargeable battery, and the spring is interposed in a compressed state between the one surface of the rechargeable battery and the spring receiving surface. A battery pack that is characterized by being.