JPH11162423A - Pack battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily set a printed-circuit board of a pack battery in the precise position within a case. SOLUTION: This pack battery is provided with a case 1, a cell 3 contained in the case 1, a terminal holder 6 with external connection terminals 4 that are connected with electrodes of the cell 3 and are exposed to the outside of the case 1, and a printed-circuit board 2 which is coupled with the terminal holder 6 and is set in the fixed position within the case 1, also which is provided with electronic components 7 fixed on the surface. The pack battery is constituted so that the printed-circuit board 2 is coupled with the terminal holder 6, and is positioned at the end part of the cell 3, then it is built in the case 1. The terminal holder 6 is positioned between the printed-circuit board 2 and the cell 3, then it sets the printed-circuit board 2 in the fixed position within the case 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art A battery pack having a built-in battery protection circuit and the like includes electronic components for realizing the protection circuit. The electronic component is fixed to a printed circuit board and arranged at a fixed position in the case. In a battery pack containing a printed circuit board, the printed circuit board needs to be disposed at a fixed position in the case. In order to dispose the printed circuit board in a fixed position in the case, for example, a positioning member is fixed by a method such as soldering, or the printed circuit board is connected to a battery cell at a precise position via a lead wire. ing.

For example, in the battery pack shown in FIG. 1, the printed circuit board 2 is connected to the battery cells 3 via lead wires (not shown), and the external connection terminals 4 are soldered. It is arranged at a fixed position in case 1. This battery pack is connected to the battery cell 3 at a fixed position via a lead wire, and further, the external connection terminal 4 is connected to the case 1.
And is disposed at a fixed position with respect to the case 1.

[0004]

The battery pack shown in FIG. 1 has a drawback that it is difficult to dispose a printed circuit board at an accurate position in a case. This is because it is necessary to connect the printed board to the correct position of the battery cell, and to fix the external connection terminal to the correct position of the printed board. If the position where the external connection terminal is fixed to the printed circuit board is shifted, the printed circuit board will not be arranged at an accurate position in the case.

The present invention has been developed for the purpose of providing a battery pack in which a printed circuit board can be arranged at an accurate position in a case as a structure that can be mass-produced easily, easily and inexpensively. .

[0006]

The battery pack of the present invention comprises:
Case 1 and battery cell 3 housed in case 1
A terminal holder 6 having an external connection terminal 4 connected to the electrode of the battery cell 3 and exposed to the outside of the case 1;
The printed circuit board 2 is provided at a fixed position in the case 1 by being connected to the terminal holder 6 and has an electronic component 7 fixed on the surface.

Further, in the battery pack according to the first aspect of the present invention, the printed circuit board 2 is connected to the terminal holder 6 and built in the case 1. The terminal holder 6 is a printed circuit board 2
The printed circuit board 2 is arranged at a fixed position in the case 1 between the battery cell 3 and the battery cell 3. Further, the printed circuit board 2 and the terminal holder 6 are not located on the surface of the battery cell 3 such as the battery pack shown in FIG.

Further, the terminal holder 6 has positioning ribs 8 for supporting the printed circuit board 2 at both ends. With this positioning rib 8, the printed circuit board 2
The printed circuit board 2 and the terminal holder 6 are connected so that a storage space 9 is formed between the terminal board 6 and the terminal holder 6. The protrusion 10 of the printed circuit board 2 is stored in the storage space 9.

In the battery pack according to the second aspect of the present invention, the terminal holder 6 is integrally formed of plastic. The plastic terminal holder 6 has a fitting portion 15 for inserting the external connection terminal 4 and holding it in a fixed position. The external connection terminal 4 fitted to the fitting portion 15 is connected to the printed circuit board 2.
To connect the printed circuit board 2 to a fixed position of the terminal holder 6.

In the battery pack according to a third aspect of the present invention, an electronic component 7 fixed to the printed circuit board 2 is stored in a storage space 9 formed between the printed circuit board 2 and the terminal holder 6.

In the battery pack according to a fourth aspect of the present invention, the storage space 9 is filled with resin, the space between the printed board 2 and the terminal holder 6 is molded with resin, and the printed board 2 is embedded in the resin. .

In the battery pack according to the present invention, a temperature sensor 12 is disposed between the terminal holder 6 and the battery cell 3.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. However, the embodiments described below exemplify 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 facilitate understanding of the claims, the numbers corresponding to the members described in the embodiments will be referred to as "columns of the claims" and " In the column of “Means of the above”. 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. 2 and the exploded perspective view of FIG. 3 has a plastic case 1, a rectangular battery cell 3 housed in the case 1, A terminal holder 6 having an external connection terminal 4 that is electrically connected to the electrode and exposed to the outside of the case 1; and a terminal holder 6 that is connected to the terminal holder 6 and disposed at a fixed position in the case 1 and has a surface. A printed circuit board 2 to which the electronic component 7 is fixed.

The case 1 is divided into upper and lower parts and molded of plastic, and has a battery cell 3 and a printed circuit board 2 inside.
And the terminal holder 6 are connected and fixed. FIG.
, The case 1 is divided into an upper case and a lower case, and the upper case has an opening window 5 through which the external connection terminal 4 is exposed to the outside. The opening window 5 is opened at a position where the external connection terminal 4 is provided inside. Upper and lower case 1
The outer perimeters are fitted together and connected in place. Alternatively, the upper and lower cases are fixed to each other by welding plastic. In addition, the case is glued with adhesive, or
It can also be fixed by bonding with an adhesive tape.

The terminal holder 6 arranges the printed circuit board 2 at a fixed position of the case 1. The terminal holder 6 is disposed between the printed circuit board 2 and the battery cell 3, as shown in an exploded perspective view of FIG. The printed circuit board 2 and the terminal holder 6 connected to each other are located at the end of the battery cell 3 and are built in the case 1. FIGS. 4 and 5 show a state in which the printed circuit board 2 is connected to the terminal holder 6. FIG.
FIG. 5 is a perspective view of the terminal holder 6 shown in FIG.

The terminal holder 6 is integrally formed entirely of plastic, and includes a main body plate 6A and a bottom plate 6A.
B are connected at right angles, and as shown in the cross-sectional view of FIG. 6, the cross section has an inverted L-shape. As shown in the perspective views of FIGS. 4 and 5, positioning ribs 8 are integrally formed on the ends of the main body plate 6A and the bottom plate 6B.

The positioning ribs 8 are provided on both ends of the terminal holder 6 by integral molding. The positioning ribs 8 are provided so as to protrude toward the printed circuit board 2 from both ends of the main body plate 6A. The positioning rib 8 is located between the printed board 2 and the main body plate 6A, and provides a storage space 9 between the printed board 2 and the terminal holder 6. The width (W) of the storage space 9 is determined by the width of the positioning rib 8. The positioning rib 8 is designed to have a width capable of storing the projection 10 such as the electronic component 7 fixed to the printed circuit board 2 in the storage space 9.

The positioning rib 8 makes contact with the surface of the printed circuit board 2 so that it is located between the printed circuit board 2 and the main body plate 6A.
A storage space 9 having a fixed width is provided. The terminal holder 6 shown in FIG. 5 is such that the end face of the upper left positioning rib 8 is brought into contact with the surface of the printed circuit board 2 in this figure, and the lower right positioning rib 8 is provided with a projection which locks the printed circuit board 2. 13 is integrally formed on the inner surface. The protrusion 13 provided on the inner surface of the positioning rib 8 contacts the surface of the main body plate 6A to hold the printed board 2 in a fixed position. Further, the lower right positioning rib 8 holds the printed circuit board 2 in a fixed position by bringing the end face of the printed circuit board 2 into contact with the inside.

Further, as shown in the perspective view of FIG. 4 and the cross-sectional view of FIG. 6, the terminal holder 6 has a fitting holding section for inserting a part of the printed circuit board 2 into the bottom plate 6B and holding it in a fixed position. 11 are provided. In the terminal holder 6 shown in the figure, a through-hole 14 into which the printed circuit board 2 can be inserted is provided in the bottom plate 6B to form the fitting holding section 11. Although not shown, the fitting holding portion may be a fitting groove for inserting a printed circuit board, instead of the through hole. The terminal holder for inserting and connecting the printed circuit board to the fitting holding portion has a feature that the printed circuit board can be connected to a more accurate position. However, the terminal holder does not necessarily need to be provided with a fitting holding portion. This is because the printed board and the terminal holder can be connected by a lead plate or the like while the printed board is in contact with the positioning rib.

The terminal holder 6 shown in the figure is connected to the fixed position by inserting the printed circuit board 2 into the fitting holding portion 11, and is connected to the printed circuit board 2 via the external connection terminals 4 fixed to the terminal holder 6. The terminal holder 6 is connected. The terminal holder 6 having this structure has a feature that the printed circuit board 2 can be reliably connected to the most accurate position.

The external connection terminals 4 are fixed to the surface of the bottom plate 6B of the terminal holder 6. The external connection terminal 4 is fixed to a fixed position by fitting to the fitting portion 15 of the terminal holder 6. The terminal holder 6 shown in FIG.
The middle is connected to the fitting portion 15 and fixed at a fixed position.
The fitting portion 15 into which the tip of the external connection terminal 4 is fitted is a narrow groove 16 provided on the bottom surface of the bottom plate 6B. The external connection terminal 4 has its tip bent into an L-shape, and the bent end is fitted into a narrow groove 16 to be connected to a fixed position. As shown in the sectional view of FIG. 6, the fitting portion 15 for fitting the middle of the external connection terminal 4 is provided with a positioning hole 17 provided in a part of the bottom plate 6B.
It is. The external connection terminal 4 is inserted into the positioning hole 17 halfway, and is fixed at a fixed position of the terminal holder 6. The external connection terminal 4 whose middle and front ends are connected to the fitting portion 15 of the terminal holder 6 is securely fixed to the terminal holder 6 so as not to be displaced.

The external connection terminal 4 shown in FIG. 6 is bent upward at the end portion of the bottom plate 6B that has passed through the through hole 14, and the bent portion is fixed to the surface of the printed circuit board 2 by soldering. . With this structure, the terminal holder 6 for fixing the printed circuit board 2 has a feature that the printed circuit board 2 can be reliably connected to an accurate position in an ideal state.

The printed circuit board 2 is connected to the terminal holder 6 such that the electronic components 7 protruding from the surface are located in the storage space 9. The printed circuit board 2 on which the electronic components 7 are disposed in the storage space 9 does not protrude outside the storage space 9. For this reason, unevenness on the outer surface of the printed circuit board 2 connecting the external connection terminals 4 can be reduced.
However, the battery pack of the present invention does not specify the direction in which the printed circuit board is connected to the terminal holder. The printed circuit board may be connected to the terminal holder so that the electronic component is located outside the printed circuit board.

In FIG. 5, only the upper part of the storage space 9 is opened, and the bottom surface is closed by the bottom plate 6B.
The storage space 9 for closing the bottom surface is preferably filled with a paste-like or liquid resin in an uncured state and resin-molded. The resin mold in the storage space 9 securely fixes the electronic components 7 provided therein, and furthermore, firmly connects the printed circuit board 2 and the terminal holder 6 to form an integrated structure.

The printed circuit board 2 has two lead plates 18 connected to the battery cells 3 fixed by soldering. One lead plate 18 is connected to the lead plate 18 connected to the battery cell 3.
Directly linked to The other lead plate 18 is connected to the battery cell 3 via the temperature sensor 12.
Linked to The temperature sensor 12 is sandwiched between the terminal holder 6 and the battery cell 3, and detects the temperature of the battery cell 3.

As described above, the terminal holder 6 connecting the printed circuit boards is assembled as a battery pack as shown in FIGS. 7 to 15 through the following steps. (1) Step of assembling temperature sensor As shown in FIG.
The lead plate 18 is connected to these terminals by spot welding or the like. The lead plate 18 connected to the battery cell 3 is linearly connected to the temperature sensor 12, and the lead plate 18 connected to the printed circuit board 2 is connected perpendicular to the temperature sensor 12.

Thereafter, the temperature sensor 12 is inserted between the U-curved insulating sheets 20, and one terminal of the temperature sensor 12 is bent 180 degrees as shown in FIG. Wrap it.

(2) Step of Insulating the End of the Battery Cell As shown in FIG.
Attach. The insulating ring 21 has an opening centered on a through hole 22 for projecting a projection electrode (not shown) provided on the sealing plate.

(3) Attaching Tape to Case The battery cell 3 is held in a fixed position in the case 1, and the lead plate 18 connected to the battery cell 3 is connected between the battery cell 3 and the case 1. As shown in FIG. 10, a tape 23 is attached to the inside of the lower case.

(4) Step of Connecting Lead Plate to Battery Cell As shown in FIG. 11, a lead plate 18 connected to the temperature sensor 12 at one end of the battery cell 3 and an insulating sheet 24 at the other end. The lead plate 19 is connected by a method such as spot welding. In the figure, the battery cells connecting these lead plates are shown on the right.

(5) Step of Connecting Terminal Holder to Battery Cell As shown in FIG. 12, the lead plate connected to the battery cell 3 and the temperature sensor 12 is spotted on the lead plate 18 fixed to the printed circuit board 2. Connect by welding or other method. By connecting the lead plates, the terminal holder 6 fixing the printed circuit board 2 is connected to the battery cell 3, as shown in FIG.

(6) Step of storing battery cells in case As shown in FIG. 14, the battery cells 3 to which the terminal holders 6 are connected are put in the case 1 and the case 1 is connected. When the battery cell 3 is placed in the case 1, the terminal holder 6 is disposed at a fixed position in the case 1. The case 1 is formed in an inner shape that can store the battery cell 3 and the terminal holder 6 in a fixed position. The terminal holder 6 housed in the case 1 exposes the external connection terminal 4 fixed thereto to the outside through the opening window 5 of the case 1.

(7) Step of Attaching Label to Case As shown in FIG. 15, a label 25 is attached to the surface of the case 1 and the test hole 26 is closed. Test hole 26 in case 1
Although not shown, a test needle is inserted from here to test the assembled battery pack. Therefore, a test terminal (not shown) is fixed to the terminal holder 6 inside the test hole 26.

[0036]

The battery pack of the present invention has a feature that the printed circuit board can be arranged at an accurate position in the case despite its simple structure. This is because the battery pack of the present invention connects the printed circuit board to a terminal holder having a unique structure disposed at the end of the battery cell, and is built in a fixed position in the case via the terminal holder. . The terminal holder for disposing the printed circuit board at a fixed position has positioning ribs at both ends for supporting the printed circuit board. The positioning rib of the terminal holder provides a storage space between the printed board and the terminal holder, and connects the printed board to a fixed position of the terminal holder. The terminal holder connects the printed circuit board to a fixed position in the storage space between the printed circuit boards so as to store the protrusions of the printed circuit board.

In the battery pack of this structure, the printed circuit board can be arranged at an accurate position via the terminal holder, and the printed circuit board can be arranged at a predetermined interval, so that the printed circuit board is ideal. It also realizes the feature that it can be installed in the case while being insulated from the state. It is due to the storage space formed by the terminal holder and the printed circuit board,
This is because electronic components and lead wires mounted on the printed circuit board can be reliably separated from the battery cells.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a conventional battery pack.

FIG. 2 is a perspective view showing a battery pack according to one embodiment of the present invention.

FIG. 3 is an exploded perspective view of the battery pack shown in FIG. 2;

FIG. 4 is a perspective view showing a terminal holder of the battery pack shown in FIG. 3;

5 is a perspective view of the terminal holder shown in FIG. 4 as viewed from below.

FIG. 6 is a sectional view of the terminal holder shown in FIG. 4;

FIG. 7 is an exploded perspective view showing an assembling process of the battery pack temperature sensor according to the embodiment of the present invention.

8 is a perspective view showing a state in which a terminal of the temperature sensor shown in FIG. 7 is bent.

FIG. 9 is an exploded perspective view showing a process of insulating the ends of the battery cells of the battery pack according to one embodiment of the present invention.

FIG. 10 is a perspective view showing a step of attaching a tape to a case of a battery pack according to one embodiment of the present invention.

FIG. 11 is an exploded perspective view showing a step of connecting a lead plate to the battery cell of FIG. 9;

FIG. 12 is an exploded perspective view showing a step of connecting a terminal holder to the battery cell of FIG. 11;

13 is a perspective view showing a state where a terminal holder is connected to the battery cell of FIG.

FIG. 14 is an exploded perspective view showing a step of housing the battery cell of FIG. 13 in a case.

FIG. 15 is an exploded perspective view showing a step of attaching a label to the case of FIG. 14;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Case 1A ... Upper case 1B ... Lower case 2 ... Printed circuit board 3 ... Battery cell 4 ... External connection terminal 5 ... Opening window 6 ... Terminal holder 6A ... Body plate 6B ... Bottom plate 7 ... Electronic component 8 ... Positioning rib 9 ... storage space 10 ... convex part 11 ... fitting holding part 12 ... temperature sensor 13 ... convexity 14 ... through hole 15 ... fitting part 16 ... groove 17 ... positioning hole 18 ... lead plate 19 ... lead plate 20 ... insulating sheet DESCRIPTION OF SYMBOLS 21 ... Insulating ring 22 ... Through-hole 23 ... Tape 24 ... Insulating sheet 25 ... Label 26 ... Test hole

Claims (5)

[Claims] Claims: 1. A case (1), a battery cell (3) housed in the case (1), and electrically connected to electrodes of the battery cell (3) to be outside the case (1). External connection terminal to be exposed
A terminal holder (6) having (4) and this terminal holder (6)
The printed circuit board (2), which is connected to the fixed position in the case (1) and fixes the electronic components (7) on the surface
In the battery pack comprising: the printed circuit board (2) is connected to the terminal holder (6), and the terminal holder (6) is located between the printed circuit board (2) and the battery cell (3). Board (2) and terminal holder (6)
Are located inside the case (1) at the end of the battery cell (3), and the terminal holder (6) has printed circuit boards (2) at both ends.
A positioning space (9) is provided between the printed circuit board (2) and the terminal holder (6) via the positioning rib (8). A battery pack characterized in that the projection (10) of the printed board (2) is stored in the storage space (9), and the printed board (2) and the terminal holder (6) are connected. 2. The terminal holder (6) is a molded plastic product. The terminal holder (6) has a fitting portion (15) for inserting the external connection terminal (4) and holding it in a fixed position. The external connection terminal (4) fitted to the attachment portion (15) is connected to a printed circuit board (2), and the printed circuit board (2) is connected to a terminal holder (6). Battery pack. 3. The printed circuit board (2) and the terminal holder (6) are connected to each other in a storage space (9) for storing an electronic component (7) fixed to the printed circuit board (2). 2. The battery pack according to item 1. 4. The storage space (9) is filled with resin,
The battery pack according to claim 1, wherein the battery pack is resin-molded. 5. The battery pack according to claim 1, wherein a temperature sensor (12) is sandwiched between the terminal holder (6) and the battery cell (3).