JP3604829B2 - Battery pack - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a battery pack containing a printed circuit board.
[0002]
[Prior art]
A battery pack containing a lithium-ion secondary battery has a built-in printed circuit board on which an electronic circuit for protecting the battery is mounted. This is to prevent the battery from being overcharged or overdischarged and to use the battery in a more ideal state. Not only lithium-ion secondary batteries, but also battery packs containing nickel-cadmium batteries, nickel-hydrogen batteries, etc., can be protected by incorporating a protection circuit and the like.
[0003]
Furthermore, in the battery pack, it is necessary to expose an electrode terminal for connecting to an electric device outside the case. The electrode terminals need to be arranged at the correct positions on the case. If the position is displaced, it causes poor contact when mounted on an electric device. The electrode terminals are fixed to a terminal holder or a printed circuit board incorporated in the case. In the battery pack in which the electrode terminals are fixed to the terminal holder, the electrode terminals can be arranged in fixed positions by the terminal holder, but special parts are required to support the electrode terminals. For this reason, there is a disadvantage that the number of parts used increases. It is difficult for a battery pack that fixes electrode terminals to a printed circuit board to accurately arrange the printed circuit board in a fixed position.
[0004]
[Problems to be solved by the invention]
In order to place the printed circuit board in the fixed position in the case, the printed circuit board is connected to the battery via the lead wire, or the case is formed into a special shape and the printed circuit board is held in place. Is being developed. In the structure in which the printed circuit board is fixed to the battery, when the battery moves in the case, the printed circuit board cannot be arranged at a fixed position. In addition, the structure for molding the case into a special shape has a disadvantage that the structure of the mold for molding the case and the removal of the mold become complicated and the cost of the case increases.
[0005]
Further, when the battery pack is mounted on an electric device, the electrode terminals are pressed against the terminals of the device. This is for electrically connecting the terminals of the electric device to the electrode terminals of the battery pack. If the position of the electrode terminal of the battery pack shifts when pressed by the terminal of the electric device, it causes a contact failure. For this reason, it is also very important that the electrode terminals disposed at fixed positions do not shift even when pressed by the terminals of the electric device. In particular, a battery pack containing a rechargeable battery may be frequently attached to and detached from an electric device for charging. When detaching, the electrode terminal slides on the terminal of the electrical equipment, and a force that is elastically pressed acts, so even in this state, make sure that the electrode terminal does not displace It is extremely important to arrange them in place.
[0006]
The battery pack that secures the electrode terminals to the printed circuit board has a printed circuit board that is accurately positioned at a fixed position, and is also positioned at a fixed position so that the electrode terminals are not displaced when pressed by the device terminals. It is important to do. In order to arrange the electrode terminals in a fixed position without displacement, it is necessary to use a tough printed circuit board. Further, it is necessary to reduce the size of the printed circuit board to reduce deformation.
[0007]
The present invention holds a printed circuit board in a fixed position with a simple structure, arranges electrode terminals fixed to the printed circuit board so as not to move to a correct position, and further holds the printed circuit board in a fixed position. Utilizing the structure described above, the electronic parts of the printed circuit board are provided with electronic parts gaps, and further, it has been developed with the aim of providing a battery pack that can arrange both the battery and the printed circuit board at the correct positions. Things.
[0008]
[Means for Solving the Problems]
In the battery pack of the present invention, a battery 1 and a printed circuit board 2 are built in a case 1. A plastic spacer 3 is provided between the battery 4 and the printed circuit board 2. The spacer 3 has a concave portion 11 in which the battery 4 is fitted on a surface facing the battery 4. On the surface facing the printed circuit board 2, a positioning protrusion 9 for disposing the printed circuit board 2 at a fixed position is integrally formed. The printed board 2 is connected to the spacer 3 via the positioning protrusion 9, and an electronic part gap 13 is provided between the spacer 3 and the printed board 2. The electronic component 16 mounted on the printed circuit board 2 is disposed in the electronic component gap 13.
Further, the printed circuit board 2 is provided with an electrode terminal 7 exposed to the outside from the electrode window 8 of the case 1. A support projection 14 for supporting the printed circuit board 2 is formed integrally with the spacer 3 on the back surface of the electrode terminal 7.
[0009]
Further, in the battery pack according to the second aspect of the present invention, the printed board 2 and the battery 4 are connected by a lead member, and the spacer 3 is disposed at a fixed position between the printed board 2 and the battery 4.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the following examples illustrate the battery pack for embodying the technical idea of the present invention, and the present invention does not specify the battery pack as follows.
[0011]
Further, in this specification, in order to make it easy to understand the claims, the numbers corresponding to the members shown in the embodiments are referred to as “claims” and “means for solving the problems”. Are added to the members indicated by "." However, the members described in the claims are not limited to the members of the embodiments.
[0012]
The battery pack shown in the exploded perspective view of FIG. 1 and the sectional view of FIG. 2 has a case 1 in which two secondary batteries 4, a printed circuit board 2, and a spacer 3 are incorporated. The case 1 is made of plastic, and connects the upper case 1A and the lower case 1B to form a closed box. In the figure, the upper case 1A is formed in a box shape opening downward, and the lower case 1B is formed in a box shape opening upward. The upper case 1A and the lower case 1B are connected to each other in a closed box shape by connecting the peripheral walls.
[0013]
Two batteries 4 are built in the case 1 in parallel. The two batteries 4 have an insulator 5 sandwiched between them. The insulator 5 has recesses on both sides into which the cylindrical battery 4 can be fitted. Battery 4 is a lithium ion secondary battery. However, as the battery 4, a secondary battery such as a nickel-cadmium battery or a nickel-hydrogen battery can be used instead of the lithium ion secondary battery.
[0014]
The printed board 2 is connected to the battery 4 via a lead member such as a lead plate 6, and a spacer 3 is sandwiched between the printed board 2 and the battery 4. The printed circuit board 2 is provided with an electronic component 16 such as a protection circuit for protecting the battery 4 from overcharging or overdischarging, or a protection circuit for forcibly preventing charging or discharging when the temperature of the battery 4 becomes abnormally high. I have. The printed board 2 has a width substantially equal to the thickness of the battery 4 and a length substantially equal to the length of the battery 4.
[0015]
The printed circuit board 2 has four electrode terminals 7 arranged on the surface. The electronic component 16 constituting the protection circuit and the like is provided on the back surface facing the spacer 3. The electrode terminal 7 is fixed to the printed circuit board 2 so as to be located at the electrode window 8 provided in the case 1. When the printed circuit board 2 is fixed at a fixed position of the case 1, the electrode terminals 7 are exposed outside the case 1 through the electrode windows 8.
[0016]
The printed circuit board 2 shown in FIG. 1 has a notch 10 into which the tip of the positioning protrusion 9 provided on the spacer 3 is fitted so that the spacer 3 can be connected to a fixed position. The notches 10 are provided on both sides of the printed circuit board 2. In the figure, the upper edge of the printed circuit board 2 is provided at both ends, and the lower edge is provided at the center and the right end.
[0017]
The spacer 3 is made of plastic, and is formed into a shape substantially the same as the outer shape of the printed circuit board 2. In order to hold the battery 4 in a fixed position, the spacer 3 has a concave portion 11 into which the battery 4 is fitted, formed on a surface facing the battery 4. The recess 11 is formed in a shape that is in close contact with the surface of the cylindrical battery. Further, the spacer 3 is integrally formed with a positioning protrusion 9 for arranging the printed board 2 at a fixed position on a surface facing the printed board 2. In the illustrated spacer 3, four positioning projections 9 are integrally formed on the upper edge and three positioning projections 9 are formed on the lower edge.
[0018]
The positioning protrusion 9 includes a support rod 9 </ b> A that comes into contact with the back surface of the printed circuit board 2 and a fitting protrusion 9 </ b> B having a protrusion 12 fitted into the notch 10 of the printed circuit board 2. The fitting protrusion 9 </ b> B protrudes the protrusion 12 from the surface supporting the back surface of the printed circuit board 2. In the spacer 3 shown in the figure, fitting protrusions 9B are formed at both ends of the upper edge, and two support rods 9A are formed integrally between them. Further, the lower edge of the spacer 3 is integrally formed with a fitting projection 9B at the center and the right end, and a support rod 9A in the middle. The height of the portion where the support rod 9A and the fitting protrusion 9B support the printed board 2 is designed to be the height at which the electronic part gap 13 is provided between the printed board 2 and the spacer 3.
[0019]
Further, the spacer 3 shown in the figure is located on the back surface of the electrode terminal 7 of the printed board 2 to be mounted, and integrally forms a supporting projection 14 for supporting the printed board 2. The support protrusion 14 has its front end surface in contact with the back surface of the electrode terminal 7 portion of the printed circuit board 2 to prevent the electrode terminal 7 from being displaced. For this reason, the height of the support protrusion 14 is designed to be equal to the height at which the support rod 9A and the fitting protrusion 9B support the printed circuit board 2. The support projection 14 is formed in a rib shape extending in the longitudinal direction of the electrode terminal 7 so as to reliably support the plurality of electrode terminals 7, and furthermore, a reinforcing rib 14 </ b> A is integrally formed in a direction perpendicular to the rib. Molding.
[0020]
The battery pack shown in FIG. 1 is assembled in the following steps.
(1) The electronic components 16 constituting the protection circuit are mounted on the printed circuit board 2.
(2) The spacer 3 is sandwiched between the printed board 2 and the battery 4, and the printed board 2 is connected to the battery 4 by the lead plate 6. In this state, the printed board 2, the spacer 3, and the battery 4 are integrally connected. In the battery pack shown in the figure, the right end of the printed circuit board 2 is connected to the battery 4 by a lead plate 6, and the left end is connected to the battery 4 by a polyswitch 15.
{Circle around (3)} The battery 4, the spacer 3, and the printed circuit board 2 are put into fixed positions of the lower case 1B, and the lower case 1B and the upper case 1A are connected. In this state, the electrode terminal 7 is exposed outside from the electrode window 8 of the case 1.
[0021]
【The invention's effect】
The battery pack of the present invention is a spacer that is sandwiched between the battery and the printed circuit board, and provides an electronic part gap between the printed circuit board and the spacer to hold the printed circuit board and the battery in a fixed position, and to print the printed circuit board. There is a feature that the electrode terminal fixed to the terminal can be supported so as not to be displaced even when pressed by the terminal of the electric device. That is, the battery pack of the present invention is provided with a concave portion for inserting the battery on the surface of the spacer facing the battery, and integrated with a positioning protrusion for disposing the printed circuit board in a fixed position on the surface facing the printed circuit board. Molding, connecting the printed board to the spacer via this positioning protrusion, providing an electronic part gap between the spacer and the printed board, and furthermore, this spacer is provided on the back of the electrode terminal of the printed board. This is because the supporting projections for supporting the printed circuit board are integrally formed.
[0022]
Further, in the battery pack of the present invention, the battery can be connected to the recess of the spacer and the printed circuit board can be connected to the positioning protrusion so that both the battery and the printed circuit board can be connected so as not to be displaced relatively. The battery, the printed circuit board, and the spacer, which are connected so as not to be displaced from each other, are arranged at fixed positions housed in the case. With this structure, the battery pack of the present invention, in which the battery, the printed circuit board, and the spacer are housed in fixed positions, does not require the case to be formed into a specially complicated structure, and uses a case that can be easily and inexpensively mass-produced. Also, the feature that the built-in parts can be stored in the correct position is realized.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing a battery pack according to an embodiment of the present invention; FIG. 2 is a longitudinal sectional view of the battery pack shown in FIG. 1;
DESCRIPTION OF SYMBOLS 1 ... Case 1A ... Upper case 1B ... Lower case 2 ... Printed circuit board 3 ... Spacer 4 ... Battery 5 ... Insulator 6 ... Lead plate 7 ... Electrode terminal 8 ... Electrode window 9 ... Positioning protrusion 9A ... Support rod 9B ... Fitting Projection 10 Notch 11 Depression 12 Projection 13 Electronic part gap 14 Supporting projection 14 A Reinforcing rib 15 Polyswitch 16 Electronic part

Claims (2)

In a battery pack having a battery (4) and a printed circuit board (2) built in a case (1),
A plastic spacer (3) is provided between the battery (4) and the printed circuit board (2), and the spacer (3) fits the battery (4) on a surface facing the battery (4). A recess (11) is formed, and a positioning protrusion (9) for arranging the printed board (2) in a fixed position is integrally formed on a surface facing the printed board (2). The printed circuit board (2) is connected to the spacer (3) via the convexity (9), and an electronic part gap (13) is provided between the spacer (3) and the printed circuit board (2). An electronic component (16) mounted on the printed circuit board (2) is disposed in the electronic component gap (13);
Further, the printed circuit board (2) is provided with an electrode terminal (7) that is exposed to the outside from the electrode window (8) of the case (1), and is located on the back of the electrode terminal (7). A battery pack characterized in that a supporting projection (14) for supporting a printed circuit board (2) is formed integrally with a spacer (3). The printed board (2) and the battery (4) are connected via a lead member, and are sandwiched between the printed board (2) and the battery (4). The battery pack according to claim 1.

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