JP2001266818A - Battery pack - Google Patents

Abstract

[PROBLEMS] To increase the dielectric breakdown voltage by connecting a case simply and easily so that there is no gap penetrating a peripheral wall at a portion connected by a locking claw. SOLUTION: The battery pack includes a plastic case 1 divided into a plurality of parts, a secondary battery 2 and a printed board 3 housed in the case 1. The case 1 divided into a plurality is provided with a peripheral wall 4 integrally formed along the peripheral edge. The first case 1A has a plurality of locking claws 5 projecting from the peripheral wall 4 to the inner surface. In the second case 1B to which the locking claw 5 is connected, the locking rib 7 is attached to the peripheral wall 4 at the connecting position of the locking claw 5.
It is provided to protrude from. The locking rib 7 has a locking portion 7 </ b> A for guiding and hooking the locking claw 5, and the inner surface of the case 1 of the locking portion 7 </ b> A is closed by a closing wall 9. The printed circuit board 3 is disposed on the inner surface of the portion connected to the locking claw 5 of the peripheral wall 4 by the locking rib 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery pack in which a printed circuit board and a secondary battery are incorporated in a plastic case, and which prevents electronic components mounted on the printed circuit board from being damaged by static electricity.

[0002]

2. Description of the Related Art Battery packs containing a printed circuit board are commercially available. The built-in printed circuit board includes, for example, a circuit that protects the battery from overcharge or overdischarge, a circuit that calculates the remaining capacity of the battery, a circuit that communicates with an electronic device to which the battery pack is mounted, and the like. The components are mounted. In order to realize these circuits, semiconductor elements such as, for example, FETs, transistors, LEDs, one-chip microcomputers, and semiconductor memories are mounted on the printed circuit board. These semiconductor elements are easily broken by high-voltage static electricity. Static electricity has a small current but a very high voltage, so that a high impedance semiconductor element is destroyed by voltage. Therefore, it is important that the printed circuit board be housed in a case with a structure that can prevent the semiconductor element from being damaged by electrostatic discharge.

[0003] By the way, the case of the battery pack is formed, for example, by dividing it into two parts in order to arrange the battery and the printed circuit board in a fixed position and assemble efficiently. In the case where the case is divided and molded, open the printed circuit board and the battery in the fixed position of one case, and then,
Assembled by connecting two cases. Since the battery pack of this structure contains a secondary battery that occupies most of the volume inside the case, the position of the printed circuit board is restricted, and almost without exception, the printed circuit board is located at the periphery of the case, in other words, two places. Is arranged near the peripheral wall for connecting the cases.

[0004]

The printed circuit board arranged near the peripheral wall is in a state of being communicated to the outside through a gap penetrating the peripheral wall connecting the two cases. The gap penetrating the peripheral wall lowers the dielectric breakdown voltage of the semiconductor element mounted on the printed circuit board. Static electricity is discharged through a gap penetrating the peripheral wall, causing dielectric breakdown of a semiconductor element mounted on a printed circuit board. This problem can be solved by connecting the peripheral walls connecting the cases with a structure that does not allow a gap to penetrate. For example, a structure in which the peripheral walls are connected by ultrasonic welding can be connected by a structure in which there is no gap penetrating the peripheral wall. However, the battery pack in which the peripheral walls are connected by this structure has a drawback that a step of ultrasonic welding is required for assembling the case, so that it cannot be assembled easily, easily, and efficiently. In addition, there is also a disadvantage that the life of the battery pack is exhausted and it takes time to open the case when disposing of the battery.

The case has a structure in which a locking claw is provided on one peripheral wall and a hook portion of the locking claw is inserted into a locking hole provided in the other case, so that the assembly can be performed efficiently and easily. However, it is extremely difficult to provide a structure in which the peripheral wall connected by this structure does not allow a gap to penetrate and a structure that can be easily connected.

The present invention has been developed to solve this drawback. An important object of the present invention is to provide a battery pack which can easily and easily connect cases to each other so as not to have a gap penetrating a peripheral wall at a portion connected by a locking claw, thereby increasing a dielectric breakdown voltage. It is in.

[0007]

The battery pack of the present invention comprises:
It comprises a plastic case 1 divided into a plurality of parts, a secondary battery 2 and a printed board 3 housed in the case 1. Further, the battery pack has all the following configurations. (A) The case 1 divided into a plurality is provided with a peripheral wall 4 integrally formed along the peripheral edge. (B) The first case 1A has a plurality of locking claws 5 projecting from the peripheral wall 4 to the inner surface. (C) The second case 1 </ b> B to which the locking claw 5 is connected has a locking rib 7 protruding from the peripheral wall 4 at the connecting position of the locking claw 5. (D) The locking rib 7 has a locking portion 7A that guides and hooks the locking claw 5, and the inner surface side of the case of the locking portion 7A is closed by a closing wall 9. (E) The printed circuit board 3 is disposed on the inner surface of the portion of the peripheral wall 4 connected by the locking claws 5 and the locking ribs 7.

Further, the battery pack of the present invention is preferably located at a position separated from both sides of the locking claw 5 of the first case 1A and outside the case 1 with respect to the locking rib 7. Thus, a ridge 6 projecting from the front end surface of the peripheral wall 4 is provided.
Further, the second case 1B is provided with a fitting groove 8 for guiding the ridge 6, and the ridge 6 is inserted into the fitting groove 8, thereby connecting the first case 1A and the peripheral wall 4 of the second case 1B. I do. In this battery pack, the projections 6 of the first case 1A can be reliably connected by being inserted into the fitting grooves 8 of the second case 1B, and the dielectric breakdown voltage can be increased by the projections 6 inserted in the fitting grooves 8.

Further, the battery pack is preferably provided with a closing wall 9 projecting from both sides of the locking rib 7 to both sides. In the battery pack having this structure, the dielectric breakdown voltage on both sides of the locking rib 7 can be increased.

[0010]

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

Further, in this specification, in order to make it easier to understand the claims, the numbers corresponding to the members shown in the embodiments are set forth in the “claims” and “ In the column of “means”. However, the members described in the claims are not limited to the members of the embodiments.

The battery pack shown in the perspective view of FIG. 1 and the exploded perspective view of FIG. 2 includes a case 1, a secondary battery 2 housed in the case 1, and a semiconductor element such as an FET or a one-chip microcomputer. And a printed circuit board 3.

The case 1 is a plastic molded product and is divided into a plurality of parts so that the battery and the printed circuit board 3 can be housed and easily assembled. In the illustrated battery pack, the case 1 is divided into two, but the case may be divided into three or more and connected. The case 1 shown in the figure comprises a first case 1A as an upper case and a second case 1B as a lower case, and the first case 1A and the second case 1B.
Is formed by integrally molding the peripheral wall 4 along the outer periphery.

The first case 1A has a locking claw 5 on the peripheral wall 4. FIG. 3 is a perspective view of the peripheral wall 4 provided with the locking claw 5 as viewed from below. As shown in this figure, the locking claw 5 protrudes from the inner surface of the peripheral wall 4 and is provided integrally with the peripheral wall 4. The locking claw 5 is provided in the second case 1B.
The inner surface is an inclined surface, and the upper end surface is a surface perpendicular to the inner surface of the peripheral wall 4 so that the inner surface of the peripheral wall 4 can be smoothly inserted and hardly come off. The locking claw 5 is formed to have a width capable of connecting the peripheral wall 4 so as not to come off, for example, 3 to 10 mm. However, since the height of the locking claw protruding from the inner surface is increased to make it difficult to come off, the width of the locking claw is reduced or widened depending on the protruding height.

Further, the peripheral wall 4 of the first case 1A shown in FIG. 3 is provided with a ridge 6 protruding from the end face of the peripheral wall 4 in order to increase the dielectric breakdown voltage on both sides of the locking claw 5. I have. The ridge 6 is provided integrally with the peripheral wall 4. The ridges 6 are provided on both sides of the locking claw 5, but are provided slightly apart from both sides of the ridges 6. This is because the peripheral wall 4 between the ridge 6 and the locking claw 5 is easily elastically deformed. When connecting the locking claw 5 to the second case 1B or removing the locking claw 5 from the second case 1B, the peripheral wall 4 is elastically deformed and the locking claw 5 is removed from the second case 1B. . Since the ridges 6 are fitted into the fitting grooves 8 of the second case 1B and prevent deformation of the peripheral wall 4, if the ridges 6 are provided without gaps on both sides of the locking claws 5, the ridges 6 are locked. There is no portion that can be elastically deformed between the claw 5 and the peripheral wall 4 is hardly elastically deformed. The interval between the ridge 6 and the locking claw 5 is, for example, 1 to 5 m.
As m, the peripheral wall 4 can be easily deformed.

Even if the ridge 6 is separated from both sides of the locking claw 5,
There is no gap through the peripheral wall 4 to be connected. This is because the locking rib 7 provided on the peripheral wall 4 of the second case 1B can be disposed between the ridge 6 and the locking claw 5.
In order to prevent a gap from penetrating the peripheral wall 4 between the ridge 6 and the locking claw 5, the ridge 6 has a width capable of wrapping around the surface of the locking rib 7.

The ridge 6 is thinner than the peripheral wall 4. This is for fitting into the fitting groove 8 provided in the peripheral wall 4 of the second case 1B. The ridge 6 in the figure is formed so as to be substantially flush with the inner surface of the peripheral wall 4.

As shown in the perspective view of FIG. 4, the second case 1B has a locking rib 7 at a position where the locking claw 5 of the first case 1A is connected. The locking rib 7 protrudes from the peripheral wall 4 and is provided integrally with the second case 1B.
Further, the locking rib 7 has a locking portion 7A for guiding and hooking the locking claw 5. The locking portion 7A is a locking hole, and the inner surface of the locking portion 7A is closed by a closing wall 9 so that the locking hole does not become a through hole. In this figure, the closing wall 9 is shown by hatching, but this hatching does not show a cross section. The closing wall 9 is the second case 1
B and the second case 1
It is molded as a part different from B and is mounted at a fixed position of the second case 1B.

The closing wall 9 shown in the figure is provided so as to protrude further from both sides of the locking rib 7. According to this structure, the dielectric breakdown voltage on both sides of the locking rib 7 can be increased. As shown in the cross-sectional view of FIG. 5, on both sides of the locking rib 7, both the closing wall 9 and the protruding ridge 6 doubly obstruct, thereby increasing the distance at which the discharge shown by the thick arrow is caused. Because you can.

Further, the second case 1B shown in FIG.
A fitting groove 8 for guiding the ridge 6 provided on the first case 1 </ b> A is provided on the distal end surface of the peripheral wall 4. First case 1A
Since the ridges 6 are provided on both sides of the locking claw 5, the fitting groove 8 guides the ridges 6, so that the fitting groove 8 is located on the front surface of the vertical wall 7 </ b> B of the locking rib 7, in other words, Case 1
The fitting groove 8 is provided on the outer side.

The case 1 having the above structure is the first case 1
The locking claw 5 of A is guided to the locking portion 7A of the locking rib 7 of the second case 1B, and the peripheral wall 4 is connected. The peripheral walls 4 connected in this state are securely connected by inserting the ridges 6 of the first case 1A into the fitting grooves 8 of the second case 1B.

FIGS. 5 to 7 show a structure in which the breakdown voltage is increased in this connection state. However,
FIG. 5 to FIG. 7 show the AA line, BB line,
It is sectional drawing of CC line. As shown in FIG. 5, on both sides of the vertical wall 7 </ b> B of the locking rib 7, as described above, the ridge 6 is inserted into the fitting groove 8, and furthermore, is double-blocked by the closing wall 9 on the inner surface of the peripheral wall 4. As a result, the dielectric breakdown voltage can be increased as a structure in which there is no gap penetrating the peripheral wall 4. On the front surface of the vertical wall 7B of the locking rib 7, as shown in FIG. 6, the protrusion 6 is inserted into the fitting groove 8, and the vertical wall 7B of the locking rib 7 is raised on the inner surface of the peripheral wall 4. As a result, the discharge distance indicated by the thick arrow can be increased, and the dielectric breakdown voltage can be increased as a structure having no gap penetrating the peripheral wall 4.
Further, in the locking portion 7A of the locking rib 7, the inner surface of the locking portion 7A is closed by the closing wall 9 as shown in the sectional view of FIG. The rise of the rib 7 can increase the discharge distance and increase the dielectric breakdown voltage.

Therefore, the case 1 having the above structure has a feature that the dielectric breakdown voltage can be increased not only at the portion where the locking claw 5 is provided but also on both sides thereof. However, the battery pack of the present invention does not necessarily need to have a structure in which the ridges and the fitting grooves are provided. This is because, for example, the width of the vertical wall of the locking rib can be increased to increase the dielectric breakdown voltage on both sides of the locking claw.

In the battery pack of the present invention, the printed circuit board 3 is disposed on the inner surface of the peripheral wall 4 connected by the locking claws 5 and the locking ribs 7, more precisely, inside the portion where the peripheral wall 4 is connected. are doing. The case 1 shown in FIG.
Are connected by a locking claw 5 and a locking rib 7. Therefore, the printed circuit board 3 is disposed inside the peripheral wall 4 on which the locking rib 7 is provided, as shown in FIGS. In the printed circuit board 3 disposed at this position, when the dielectric breakdown voltage of the connecting portion is reduced, the semiconductor element mounted on the printed circuit board 3 is discharged and thus the dielectric breakdown voltage is increased by the above-described unique structure. are doing.

The first case 1A and the second case 1B are
All parts such as the secondary battery 2 and the printed circuit board 3 are housed inside and the peripheral wall 4 is connected. In the case 1 shown in the figure, four secondary batteries 2 are accommodated in a longitudinal direction, that is, arranged in one vertical line. One secondary battery 2 is arranged in parallel with the secondary batteries 2 stored at both ends, and a total of six secondary batteries 2 are stored. The case 1 has a slender outer shape because a plurality of rechargeable batteries 2 are housed vertically. The case 1 in this figure has an elongated shape having a length capable of storing four rechargeable batteries 2 side by side and a width capable of storing the rechargeable batteries 2 side by side in two rows. Further, the case 1 shown in the figure has a shape in which a portion where the printed circuit board 3 is provided protrudes.

The first case 1A and the second case 1B
A power supply mounting unit 10 is provided for exposing the connection terminals fixed to the printed circuit board 3 to the outside. In the battery pack shown in the figure, a power supply mounting portion 10 which is a U-shaped concave portion is provided in a first case 1A, and a terminal holder 11 fixed to the printed circuit board 3 is provided here.

The printed circuit board 3 fixes a semiconductor element. The semiconductor element is, for example, an FET, a transistor, an LED, a one-chip microcomputer, a semiconductor memory, or the like. Furthermore, a terminal holder 1 having metal connection terminals
1 is also fixed. The terminal holder 11 has on both sides convex ridges 11A extending vertically in the figure. In the second case 1B, a support column 12 having a vertical groove 12A for guiding the convex line 11A on the opposing surface is integrally formed and provided. The convex line 11A is inserted into the vertical groove 12A, and the terminal holder 11 is formed. Is mounted on the fixed position of the second case 1B, and the printed circuit board 3
Is disposed at a fixed position of the second case 1B.

The case 1 has a built-in secondary battery 2.
The illustrated battery pack incorporates a lithium ion secondary battery that is a cylindrical battery. However, the battery pack of the present invention
A secondary battery to be stored is not limited to a cylindrical battery, and a square battery can be stored. As the secondary battery, a battery such as a nickel-hydrogen battery or a nickel-cadmium battery can be used.

[0029]

According to the battery pack of the present invention, the case can be easily and easily connected to the portion connected by the locking claw such that there is no gap penetrating the peripheral wall, thereby increasing the dielectric breakdown voltage. is there. It is the battery pack of the present invention,
The peripheral wall is integrally formed along the peripheral edge of the divided plastic case, and the first case is provided with a plurality of locking claws projecting from the peripheral wall to the inner surface, and the locking claws are connected. In the second case, a locking rib is provided at a connecting position of the locking claw so as to protrude from the peripheral wall, and the locking rib is provided with a locking portion for guiding and hooking the locking claw. This is because the inner surface side of the case of the stopper is closed by the closing wall. Since the inner wall of the locking portion is closed by the closing wall, the dielectric breakdown voltage can be increased as a structure in which there is no gap penetrating the surrounding wall. Therefore, the battery pack of the present invention is arranged near the peripheral wall with a high dielectric breakdown voltage, although the divided case can be efficiently and easily assembled with the locking claws provided on the peripheral wall. There is a feature that dielectric breakdown of a semiconductor element or the like mounted on a printed circuit board can be reliably prevented.

[Brief description of the drawings]

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

FIG. 2 is an exploded perspective view of the battery pack shown in FIG.

FIG. 3 is a perspective view showing a state where a peripheral wall of a first case of the battery pack shown in FIG. 2 is viewed from below.

4 is an enlarged perspective view of a second case of the battery pack shown in FIG.

FIG. 5 is a sectional view taken along line AA of the battery pack shown in FIG.

FIG. 6 is a sectional view taken along the line BB showing a connection state of the case of the battery pack shown in FIG. 4;

FIG. 7 is a cross-sectional view taken along the line C-C showing a connection state of the case of the battery pack shown in FIG.

[Explanation of symbols]

1: Case 1A: First case 1
B: second case 2 ... secondary battery 3 ... printed circuit board 4 ... peripheral wall 5 ... locking claw 6 ... convex ridge 7 ... locking rib 7A ... locking portion 7
B ... vertical wall 8 ... fitting groove 9 ... closing wall 10 ... power supply mounting part 11 ... terminal holder 11A ... ridge 12 ... support pillar 12A ... vertical groove

Claims (3)

[Claims] 1. A battery pack comprising a plurality of divided plastic cases (1), a secondary battery (2) housed in the case (1) and a printed circuit board (3), wherein all of the following A battery pack having a configuration. (A) The divided case (1) has a peripheral wall (4) integrally formed along the peripheral edge. (B) The first case (1A) has a plurality of locking claws (5) projecting from the peripheral wall (4) to the inner surface. (C) The second case (1B) to which the locking claw (5) is connected is
A locking rib (7) is provided at a connection position of the locking claw (5) so as to protrude from the peripheral wall (4). (D) The locking rib (7) has a locking portion (7A) for guiding and hooking the locking claw (5), and the case inner surface side of the locking portion (7A) is a closed wall (9). It is closed. (E) A printed circuit board (3) is provided on the inner surface of the portion of the peripheral wall (4) connected by the locking claws (5) and the locking ribs (7). The first case (1A) is located at a position separated from both sides of the locking claw (5) and located outside the case (1) with respect to the locking rib (7). The second case (1B) has a fitting groove (8) for guiding the convex ridge (6), and has a convex ridge (6) protruding from the distal end surface of the peripheral wall (4). The battery pack according to claim 1, wherein the first case (1A) and the peripheral wall (4) of the second case (1B) are connected by inserting the first case (6) into the fitting groove (8). 3. The battery pack according to claim 1, wherein the closing wall (9) is provided so as to protrude further from both sides of the locking rib (7).