JP2001266820A - Battery pack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To arrange a printed board to correct position without fixing it by using screw or the like and fix a lead wire surely to correct position by soldering. SOLUTION: The battery pack houses a printed board 3 and batteries 2 in its case 1, and a separation wall 7 is formed by integral molding at the boundary between the printed board 3 and the batteries 2. The battery pack separates a battery chamber 8 housing the batteries 2 and a board chamber 9 housing the printed board 3 by the separation wall 7. Further, the battery pack has a separation wall supporting rib 11, protruding from the separation wall 7 to the printed board chamber 9 side, formed integrally with the case 1 supporting the printed board 3 at its lower surface, and the lower surface of the printed board 3 is put on the separation wall supporting rib 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery pack having a battery and a printed circuit board built in a case.

[0002]

2. Description of the Related Art A battery pack containing a printed board is
A partition is provided inside the case to divide a battery chamber containing a battery and a board chamber containing a printed board. The battery pack having this structure can prevent the electrolyte leaking from the battery from moving toward the printed circuit board. For this reason, failure of the printed circuit board due to the electrolytic solution can be effectively prevented.

[0003] The printed circuit board built into the case includes:
For example, a circuit that protects the battery from overcharge or overdischarge, a circuit that calculates the remaining capacity of the battery, an electronic component that implements a circuit that communicates with the electronic device in which the battery pack is mounted, and a battery pack connected to the device It implements connectors and so on.

[0004] The printed circuit board is connected to the battery via a lead wire in order to supply power to the mounted electronic circuit or connect a connector fixed thereto to the battery. Since the lead wiring connects the battery and the printed board, it is extended from the battery chamber to the board chamber beyond the partition wall, and one end is fixed to the printed board by soldering.

[0005] The conventional battery pack having the above structure is assembled as follows. After mounting the battery in the battery compartment and the printed circuit board in the board compartment, the lead wires connected to the battery are fixed to the printed circuit board by soldering over the partition walls. When the lead wiring is soldered and fixed to the printed board, a soldering iron is pressed against the upper surface of the printed board to melt the solder and fix the lead wiring to the printed board. At this time, the printed board is pushed in by the soldering iron, so that the printed board is temporarily fixed with a tape or the like. After soldering, the tape is removed.

[0006]

In the conventional battery assembled in the above process, when the lead wiring is fixed to the printed circuit board by soldering, the printed circuit board is temporarily fixed with a tape or the like so as not to be displaced. There is a disadvantage that it takes much time and further takes time to remove the temporary fixing after the soldering is completed. Further, the printed circuit board temporarily fixed with a tape or the like has a drawback that if a soldering iron is strongly pressed, the position of the printed circuit board is shifted and the lead wiring cannot be soldered to an accurate position. This disadvantage can be solved by, for example, a structure in which the printed circuit board is screwed to the case. However, this structure is troublesome to screw the printed circuit board.
Also, a plurality of lead wires are fixed to the printed circuit board by soldering. To prevent the plurality of soldering points from being moved by pressing with a soldering iron, screw the area around each soldered part into a case. There is a drawback that it needs to be stopped and assembly is troublesome.

[0007] The present invention has been developed for the purpose of solving such disadvantages. An important object of the present invention is to provide a battery pack which can be arranged at an accurate position without fixing a printed circuit board by a method such as screwing.

Another important object of the present invention is to hold the printed circuit board without moving it temporarily, and fix the lead wiring when soldering and fixing the lead wiring to the printed circuit board. An object of the present invention is to provide a battery pack that can be securely soldered and fixed at an accurate position.

[0009]

The battery pack of the present invention comprises:
A printed circuit board 3 and a battery 2 are built in the case 1,
Case 1 is located at the boundary between printed circuit board 3 and battery 2.
Is provided with a partition wall 7 which is integrally formed. In the battery pack, the partition 7 divides a battery compartment 8 containing the battery 2 and a board compartment 9 containing the printed circuit board 3. Furthermore, the battery pack protrudes from the partition 7 to the substrate chamber 9 side, and integrally forms the partition support rib 11 for supporting the printed board 3 from the lower surface with the case 1 to form the printed board 3.
Is placed on the partition ribs 11.

Further, the battery pack preferably has a partition support rib 1 on the bottom surface near the lead solder portion 3A of the printed circuit board 3 to which the lead wiring 12 is connected by soldering on the upper surface.
1 is arranged. In the battery pack having this structure, the bottom surface near the lead solder portion 3A of the printed circuit board 3 pressed by the soldering iron is supported by the partition support ribs 11, so that the printed circuit board 3
There is a feature that the lead wiring 12 can be securely fixed by effectively preventing deformation of the lead wire 12.

Further, the battery pack preferably has a holding slit 13 for fitting and holding the lead wiring 12 in the partition wall supporting rib 11. The holding slit 13 can hold the lead wire 12 here and in a fixed position.

Further, in the battery pack, the lead wire 12 is used as a lead plate, and the leading end of the lead plate is inserted into the holding slit 13 so as to be arranged in parallel with the surface of the partition wall 7 on the substrate chamber 9 side. The bent piece 12A can be fixed to the surface of the printed circuit board 3 by soldering by bending the portion placed in the portion 13. This battery pack is simple and easy,
There is a feature that the lead wiring 12 can be soldered to a predetermined position on the printed circuit board 3.

Further, in the battery pack, the connector 4 is fixed to the printed circuit board 3, the connector 13 is fixed to the case 1, and the printed circuit board 3 is incorporated in the case 1 in a non-fixed structure. The case 1 can be disposed at a fixed position.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. However, the following examples illustrate a battery pack for embodying the technical idea of the present invention, and the present invention does not specify a 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 will be referred to as “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 has a case 1 and a printed circuit board 3 fixing a battery 2 and a connector 4 built in the case 1.
And In the battery pack shown in the figure, the printed circuit board 3 is housed in the case 1 in a non-fixed structure, and is disposed at a fixed position of the case 1 via the connector 4. The non-stick structure is
For example, this does not mean a structure in which the printed circuit board 3 is fixed to the case 1 with screws so as not to move, but a state in which the printed circuit board 3 is stored in the case 1 with a play.

The battery 2 of the battery pack shown is a thin rectangular lithium ion secondary battery. The battery 2 incorporated in the case 1 is not specified as a prismatic lithium ion secondary battery,
It can also be a cylindrical secondary battery. As the battery, all secondary batteries such as a nickel-hydrogen battery and a nickel-cadmium battery can be used.

The printed circuit board 3 fixes the connector 4 and electronic components. Electronic components include semiconductor elements such as FETs and transistors for realizing a protection circuit for the battery 2,
Alternatively, it is a microcomputer or the like that calculates a resistance, a capacitor, or the remaining capacity of the battery 2 and transmits the calculated value to a device.

The connector 4 has metal connection terminals fixed to the insulating molded holder 5, and the leads of the connection terminals are fixed to the printed circuit board 3 by soldering. In this structure, the printed circuit board 3 and the connector 4 can be electrically connected and fixed. However, the connector can be fixed by bonding the insulating molded holder to the printed circuit board or by screwing.

The insulating molded holder 5 is a molded plastic product, and is formed into an elongated rectangular shape as a whole. The insulating molding holder 5 has a plurality of slits provided on the front surface for providing connection terminals, and ridges 5A extending vertically in the figure are integrally formed on both sides. The slit is provided with a metal connection terminal on the opposite surface so that it can be electrically connected to a device terminal inserted into the slit.

As shown in the perspective view of FIG. 2, the connector 4 is positioned and fixed on the side edge of the printed circuit board 3. The connector 4 has a part of the insulating molded holder 5 placed on the printed circuit board 3 and the other part fixed to the printed circuit board 3 so as to project from the side edge of the printed circuit board 3.
However, the connector 4 shown in FIG.
, And then shows a state of being turned upside down.

The case 1 is a plastic molded product, and is divided into a first case 1A and a second case 1B so that the battery 2 and the printed 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 illustrated case 1 includes a first case 1A as a lower case and a second case 1B as an upper case. The first case 1A and the second case 1B are formed by integrally forming a peripheral wall 6 along the outer periphery. It is provided by molding.

The first case 1A and the second case 1B are
The peripheral wall 6 is integrally formed along the peripheral edge and provided.
Of the case 1A and the peripheral wall 6 of the second case 1B,
The printed circuit board 3 and the battery 2 are built therein. First
The case 1A is provided with a partition wall 7 integrally formed with the case 1 at a boundary between the printed board 3 and the battery 2.
The partition 7 divides a battery chamber 8 containing the battery 2 and a board chamber 9 containing the printed circuit board 3. Partition wall 7
Is a thin plate-shaped gap 10 through which the lead wiring 12 passes.
Is provided. In the illustrated partition wall 7, gaps 10 for passing lead wires 12 are provided at both ends and an intermediate portion. Partition wall 7
Is disposed at a position where the side edge of the printed board 3 contacts or approaches the side edge of the printed board 3. Substrate room 9
Is a region surrounded by the peripheral wall 6 and the partition 7, and the printed circuit board 3 is disposed at a fixed position by the peripheral wall 6 and the partition 7. Therefore,
The inner shape of the peripheral wall 6 and the inside of the partition 7 of the substrate chamber 9 is substantially equal to the outer shape of the printed board 3, and more precisely, is slightly larger than the outer shape of the printed board 3. The substrate chamber 9 having this shape can be disposed at a fixed position in which the printed circuit board 3 is put. In the illustrated battery pack, a rectangular printed board 3 is incorporated, so that the partition wall 7 is linear and the board chamber 9 is rectangular.

Further, the first case 1A shown in FIG.
And ribs 11 projecting toward the substrate chamber 9 and supporting the printed circuit board 3 from below are provided integrally with the case 1. The partition support ribs 11 support the lower surface of the printed circuit board 3 and hold it at a fixed position.

The partition support rib 11 has a lead wiring 1
2 is provided on the bottom surface near the lead solder portion 3A of the printed circuit board 3 to which the printed circuit board 2 is connected by soldering. In the battery pack of FIG. 2, the partition support ribs 11 are provided immediately below the lead solder portions 3A. This structure is ideally suited for printed circuit boards 3
I support. It is the lead solder part 3 of the printed circuit board 3.
This is because, when the lead wiring 12 is connected to A by soldering, the partition solder rib 11 supports the portion directly below the lead solder portion 3A of the printed circuit board 3 pressed by a soldering iron.

However, in the battery pack of the present invention, it is not necessary to provide the lead solder portion 3A directly below the lead solder portion 3A. For example, as shown in FIG. 3, partition support ribs 11 are provided on both sides of
It is because it can support. However, when the partition ribs 11 are provided on both sides remote from the lead solder portion 3A, the printed circuit board 3 is pressed by a soldering iron and the lead wiring 1 is pressed.
When soldering 2, the printed circuit board 3 is deformed and it becomes difficult to securely fix the lead wiring 12. The rate at which the printed board 3 is deformed while supporting both sides of the lead solder portion 3A differs depending on the thickness of the printed board 3. The thick printed circuit board 3 supports both sides of the printed circuit board 3 away from the lead solder portion 3A, so that the deformation of the printed circuit board 3 can be reduced. In FIG. 3, the distance (d) between the lead solder portion 3A and the partition rib 11 is shown.
Is smaller than three times the thickness of the printed circuit board 3, the lead solder portion 3A is pressed and soldered to the printed circuit board 3.
Can be almost eliminated. Therefore,
In the present specification, the term “near the lead solder portion” is used not only immediately below the lead solder portion 3A but also at a position closer than three times the thickness of the printed circuit board 3 from both sides thereof and includes both sides thereof. .

The partition support rib 11 has an upper end surface in contact with the lower surface of the printed circuit board 3 to prevent the printed circuit board 3 from being pushed by a soldering iron. Therefore, the partition support rib 1
1 is formed at a height such that the upper end is located on the lower surface of the printed circuit board 3.

The partition support rib 11 has a shape in which the lower surface is connected to the case 1 and one side edge is connected to the partition 7.
And is provided integrally with the case 1A. Further, FIG.
The rib 11 shown in FIG.
Is held in a fixed position. The holding slit 13 holds the lead wiring 12 in place at this position. The partition support rib 11 shown in the figure has an L-shaped overall shape, and a holding slit 13 is provided between the rib 7 and the partition 7.

The holding slit 13 shown in the above figures holds the lead plate as the lead wiring 12. Since the lead plate is thin, the gap between the holding slits 13 is narrowed. When the lead wiring is a lead wire, the width of the holding slit is made wide enough to accommodate the lead wire. Further, the first case 1A shown in FIGS. 4 to 6 has a holding slit 13 for the partition wall supporting rib 11 at a portion where the lead plate is bent and soldered to the printed circuit board 3 to be fixed. 4, the leading end of the lead plate is inserted into the holding slit 13 to hold the lead plate parallel to the surface of the partition 7 on the substrate chamber 9 side, as shown in FIG. This lead plate is
The other end is connected to the electrode of the battery 2 by a method such as spot welding. Further, the lead plate is provided with a gap 1 at the end of the partition wall 7.
It is bent at a right angle at 0 and is arranged along the substrate chamber 9 side of the partition wall 7, and the leading end is inserted into the holding slit 13 and held at a fixed position.

The lead plate is bent just above the partition ribs 11 as shown in FIGS. 4 and 5, and the bent piece 12A is soldered to the lead solder portion 3A of the printed circuit board 3 as shown in FIG. It is attached and fixed. With this structure, the lead wiring 12 can be connected to the printed circuit board 3 in an ideal state. This is because the leading end can be reliably connected to the lead solder portion 3A of the printed circuit board 3 while holding the lead wiring 12 with the partition support rib 11.

The battery pack shown in FIG.
2 is connected to the printed circuit board 3. The two lead wires 12 pass through the gaps 10 provided on both sides of the partition 7 and are bent at right angles along the substrate chamber 9 side of the partition 7, and the remaining two lead wires 12 After passing through the gap 10 provided in the middle, the partition wall 7 is bent at a right angle along the side of the substrate chamber 9 of the partition wall 7, the leading end thereof is held by the holding slit 13, and the bent piece 12 A is connected to the lead solder portion of the printed circuit board 3. 3A and fixed by soldering. Two lead wires 12 passing through the middle of the partition 7
Although not shown, an insulating sheet is provided between them to insulate them.

Further, the first case 1A includes a peripheral wall 6
A peripheral wall support rib 14 is integrally formed and provided on the inner surface of. The printed circuit board 3 is supported by both the peripheral wall support ribs 14 and the partition wall support ribs 11 and is placed at a fixed position in the case 1. The battery pack shown in FIG.
Built-in. The printed circuit board 3 having this shape can be disposed in the case 1 in an ideal state while supporting all the four sides. One side of the printed board 3 is supported by the partition support ribs 11. Since the remaining three sides are arranged on the inner surface of the peripheral wall 6,
It is supported by a peripheral wall support rib 14 provided on the inner surface of the peripheral wall 6. However, the printed circuit board can be placed in a fixed position while supporting both side edges. Therefore, the printed circuit board can be configured to be supported by the partition wall supporting rib provided on the partition wall and the peripheral wall supporting rib provided only on the peripheral wall facing the partition wall.

Further, in the structure for supporting the printed circuit board on the inner surface of the peripheral wall, it is not always necessary to provide a peripheral wall supporting rib connected to the peripheral wall. This is because it is also possible to provide a support column protruding from the bottom surface of the first case away from the peripheral wall.

The first case 1A includes an electrode window 15 for holding the connector 4 fixed to the printed circuit board 3 in a fixed position.
Is open. The electrode window 15 is provided with vertical walls 16 so as to face both sides. The vertical wall 16 is connected to the peripheral wall 6 and integrally formed with the first case 1A. The vertical wall 16 is provided with a guide 16A for guiding the ridge 5A provided on the connector 4. Guide 16A in the figure
Is a slit for inserting the ridge 5A of the connector 4 and connecting it to a fixed position of the electrode window 15. The guide may be a groove into which the connector can be inserted.

Further, in FIG. 2, the first case 1A
As shown in the cross-sectional view of FIG.
A support portion 17 for supporting the lower surface of the connector 4 and a back plate 18 for preventing the connector 4 from being pushed in are provided integrally with the case 1. The first of this structure
In the case 1A, the both sides of the connector 4 provided in the electrode window 15 are sandwiched between the vertical walls 16, the lower surface of the connector 4 is supported by the support portion 17, and the back surface of the connector 4 is supported by the back plate 18. To hold. First case 1
7A is connected to the second case 1B, as shown in the cross-sectional view of FIG.
The connector 4 is pressed by the peripheral wall 6, and the upper, lower, left, right, and rear surfaces of the connector 4 are held by the case 1 and held in place.

In the second case 1B, a peripheral wall 6 connected to the peripheral wall 6 of the first case 1A is integrally formed and provided.
The first case 1A and the second case 1B are connected, for example, by connecting the peripheral wall 6 by a locking structure, by ultrasonic welding, or by bonding.

The battery pack having the above structure is assembled as follows. FIG. 2 is an exploded view of the assembled battery pack for ease of understanding. The battery 2 and the printed circuit board 3 are assembled in the following steps instead of being mounted on the first case 1A in a connected state. Can be

(1) The first case in which the second case 1B is not connected
The printed circuit board 3 to which the connector 4 is fixed is mounted in the board room 9 of the case 1A. (2) The battery 2 in which the lead wires 12 are connected to the electrodes is
In the battery compartment 8 of the case 1A. At this time, battery 2
Lead wires 12 connected to the battery chamber 8 are guided from the battery chamber 8 to the substrate chamber 9 through the gap 10 between both sides of the partition wall 7 and the middle. (3) The lead wire 12 is held in the holding slit 13 on the side of the partition 7 on the side of the substrate chamber 9, and the leading end is bent horizontally so that the bent piece 12 </ b> A follows the surface of the printed circuit board 3. However, the lead wiring 12 can be bent in advance and guided to the holding slit 13. (4) Connect the bent piece 12A of the lead wiring 12 to the printed circuit board 3
And soldered to the lead solder portion 3A. (5) The second case 1B is connected to the first case 1A, and the battery 2 and the printed circuit board 3 are stored in the case 1.

[0039]

According to the battery pack of the present invention, it is possible to dispose the printed circuit board at an accurate position without fixing the printed circuit board by screws or the like, and without temporarily fixing the printed circuit board.
It has the feature that it can be held so as not to move, and the lead wiring can be securely fixed to the correct position by soldering. That is, the battery pack of the present invention provides a partition integrally formed in the case at the boundary between the printed circuit board and the battery built in the case to partition the battery chamber and the substrate chamber, and projects from the partition toward the substrate chamber. This is because the partition supporting ribs for supporting the printed board from the lower surface are integrally formed with the case, and the lower surface of the printed board is placed on the partition supporting ribs. In the battery pack having this structure, the lower surface of the printed circuit board can be supported by the ribs for supporting the partition walls, so that the displacement caused when the lead wiring is soldered to the printed circuit board can be effectively 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 plan view showing the vicinity of a lead solder portion of a printed circuit board of the battery pack shown in FIG. 2;

FIG. 4 is an enlarged perspective view showing a state in which lead wires are guided by partition ribs.

FIG. 5 is an enlarged perspective view showing a state in which a leading end of a lead wire guided by a partition support rib is bent.

FIG. 6 is an enlarged perspective view showing a state where a bent piece of a lead wiring is connected to a printed circuit board;

FIG. 7 is an enlarged sectional view of a main part of the battery pack shown in FIG. 1;

[Explanation of symbols]

1: Case 1A: First case 1
B ... second case 2 ... battery 3 ... printed board 3A ... lead solder part 4 ... connector 5 ... insulation molding holder 5A ... projection 6 ... peripheral wall 7 ... partition wall 8 ... battery room 9 ... substrate room 10 ... gap 11 ... partition wall Support rib 12 Lead wire 12A Bent piece 13 Holding slit 14 Peripheral wall support rib 15 Electrode window 16 Vertical wall 16A Guide 17 Support part 18 Back plate

Claims (5)

[Claims] 1. A printed circuit board (3) and a battery (2) in a case (1).
And a partition (7) formed integrally with the case (1) at the boundary between the printed circuit board (3) and the battery (2). Battery compartment containing batteries (2)
(8) and a board compartment (9) accommodating the printed board (3), the battery pack (3) protruding from the partition (7) toward the board compartment (9).
Is formed integrally with the case (1), and the lower surface of the printed circuit board (3) is placed on the partition support rib (11). Battery pack. 2. A partition support rib (11) is provided on a bottom surface near a lead solder portion (3A) of a printed circuit board (3) to which a lead wiring (12) is connected by soldering on an upper surface. The battery pack according to claim 1. 3. The battery pack according to claim 1, wherein a holding slit (13) for fitting and holding the lead wiring (12) is provided in the partition wall supporting rib (11). 4. The lead wiring (12) is a lead plate. The lead plate has a tip portion inserted into a holding slit (13), and a partition wall (7).
Is arranged parallel to the surface of the substrate chamber (9) side of the
The bent piece (12A) bent at the portion put in the (13) is fixed to the surface of the printed circuit board (3) by soldering.
Battery pack described in. 5. A structure in which a connector (4) is fixed to a printed circuit board (3), the connector (13) is fixed to a case (1), and the printed circuit board (3) is not fixed to the case (1). And the printed circuit board (3) via the connector (13).
2. The battery pack according to claim 1, wherein the battery pack is disposed at a fixed position of (1).