JPH07122249A - Pack battery - Google Patents

Abstract

PURPOSE:To improve the safety of a battery against the abnormal rise of temperature by simplifying wiring work, and arranging a temperature element in an accurate position. CONSTITUTION:In a pack battery, cells 1 are built in a case 3. The case 3 has a storage part 4 of a printed board 5, and a bottom plate 4A for partitioning the printed board 5 and the cell 1 is provided in the bottom of the storage part 4. A temperature element 2 protruded from a surface is fixed to the printed board 5. A window 6 for inserting the temperature element 2 through an internal surface of the case 3 is opened in the bottom plate 4A. The printed board 5 is arranged in the storage part 4. The temperature element 2 of the printed board 5, appearing in the internal surface of the case 3 from the window 6, is arranged in contact with or adjacent to a surface of the cell 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 in a case.

[0002]

2. Description of the Related Art FIG. 1 shows a cross-sectional view of a conventional battery pack in which a battery is built in a case. The battery pack shown in this figure
A plurality of batteries 1 are accommodated in parallel inside the case. In order to detect the surface temperature of the battery 1, a temperature element 2 such as a thermistor is also incorporated. The temperature element 2 is used in a protection circuit that detects that the temperature of the battery 1 has risen abnormally and forcibly interrupts the current. In order to enhance the safety of the battery pack, the temperature element is incorporated in the battery pack without exception. The temperature element needs to accurately measure the battery temperature. This is because if the battery temperature cannot be accurately detected, the current cannot be reliably cut off when the battery temperature becomes abnormally high. The battery pack shown in the figure is connected to lead wires (not shown) welded to the electrodes of the battery 1 in order to fix the temperature element 2 at a predetermined position.

[0003]

In the battery pack of this structure, it takes time to wire the temperature element 2 to the lead wire connected to the electrode and dispose the temperature element 2 at the correct position. In particular, connecting a lead wire to an electrode of a battery and soldering a temperature element to the lead wire to dispose the temperature element at an accurate position is a laborious work. Furthermore, not only is it troublesome to wire the temperature element, but it is also difficult to dispose the temperature element at an accurate position. This is because the freely deformable lead wire cannot fix the temperature element so as not to move.

By fixing the temperature element to the printed circuit board and connecting the printed circuit board to the battery via the lead wire,
Wiring of the temperature element can be simplified. However, this structure has a drawback that the wiring of the printed circuit board is troublesome because the printed circuit board is arranged at an accurate position by the lead wire welded to the battery.

The present invention was developed for the purpose of solving this drawback. An important object of the present invention is to provide a battery pack that simplifies the wiring work and allows the temperature element to be arranged at an accurate position, and can increase the safety against an abnormal temperature rise of the battery.

[0006]

The battery pack of the present invention comprises:
The battery 1 is built in the case 3, and the following unique configuration is provided. (A) The case 3 is provided with a storage part 4 for accurately disposing the printed circuit board 5 at a predetermined position. (B) The case 3 has a printed circuit board 5 on the bottom of the storage section 4.
Printed circuit board 5 for isolating and insulating battery 1 from battery 1.
And a bottom plate 4A for partitioning the battery 1 from each other. (C) The temperature element 2 is fixed so as to project from the surface of the printed board 5. (D) The temperature element 2 fixed to the printed board 5 is the battery 1
In order to detect the temperature of the
The bottom plate 4A is provided with a window 6 through which the temperature element 2 penetrates the inner surface of the case 3. (E) The printed circuit board 5 is arranged in the housing portion 4 of the case 3, and the temperature element 2 of the printed circuit board 5 is exposed from the window 6 of the bottom plate 4A to the inner surface of the case 3 and is attached to the surface of the battery 1. Detects battery temperature by contact or approach.

[0007]

The exploded perspective view of the battery pack of the preferred embodiment of the present invention is shown in FIG. In the battery pack shown in this figure, a housing 4 for a printed circuit board 5 is provided on the upper surface of a case 3B. A printed circuit board 5 is arranged in the storage section 4. The printed circuit board 5 projects to the lower surface to fix the temperature element 2. The bottom plate 4A of the housing portion 4 has a window 6 opened to expose the temperature element 2 protruding from the printed circuit board 5 into the case 3. As shown in the cross-sectional view of FIG. 3, the temperature element 2 of the printed circuit board 5 fixed to the housing portion 4 is exposed in the case 3 through the window 6 of the bottom plate 4A and contacts the surface of the battery 1. As shown in FIG. 3, the temperature element 2 arranged at the bottom via the printed circuit board 5 and the case 3 is fixed so as not to move to an accurate position and accurately detects the battery temperature.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. However, the examples described below exemplify a battery pack for embodying the technical idea of the present invention, and the present invention does not specify the battery pack to the following structure.

Further, in this specification, for easier understanding of the claims, the numbers corresponding to the members shown in the embodiments are referred to as "claims column", "action column", and "action column". It is added to the members shown in the section of "Means for Solving the Problems". However, the members shown in the claims are
It is by no means specific to the members of the examples.

The battery pack shown in FIGS. 2 and 3 has a case 3
And a printed circuit board 5 and a battery 1. The case 3 is made of plastic in a box shape, and when connected to each other,
2 in case 3A and case 3B which are closed box type
It is divided. In the figure, the upper case 3B is formed with a recess on the upper surface thereof to form a storage portion 4 for the printed circuit board 5. In order to horizontally store the rectangular printed circuit board 5, the storage section 4 is formed into an inner concave portion slightly larger than the outer shape of the printed circuit board 5.

The bottom of the accommodating portion 4 is a bottom plate 4A for partitioning the printed circuit board 5 accommodated therein from the battery 1 contained therein.
Is being molded. The bottom plate 4A is made of plastic and integrally molded with the case 3B. Case 3B shown in FIG.
In order to prevent lateral displacement of the built-in battery 1,
The ridge 4B is projected between the two. Further, locking portions 7 for connecting a lid 8 that closes the storage portion 4 are provided on both side edges of the bottom plate 4A. The locking portion 7 is formed with a recess for locking the hook of the lid 8.

The lid 8 is formed in such a size that it can close the opening of the accommodating portion 4, and projects downward to integrally form the hook 8A and the pressing rod 8B of the printed circuit board 5. The hook 8A is inserted into the locking portion 7 of the storage portion 4, and the lid 8 is connected to the storage portion 4. In this state, the pressing rod 8B of the lid 8 presses the upper surface of the printed board 5 to hold the printed board 5 in place. The printed circuit board 5 whose upper surface is pressed by the pressing rod 8B is arranged at a fixed position by pressing the lower surface with the boss 9.

In order to press and support the lower surface of the printed circuit board 5, a boss 9 is formed on the bottom plate 4A of the storage section 4 so as to project. As shown in FIG. 5, the bosses 9 are provided at the three corners of the bottom plate 4A so that the printed board 5 can be supported at three points. The boss 9 has a thin tip and is inserted into the hole 5A of the printed circuit board 5.

Further, the bottom plate 4A of the housing portion 4 has a window 6 opened in order to expose the temperature element 2 fixed to the printed circuit board 5 in the case 3. The window 6 is the printed circuit board 5
The bottom plate 4A is fixed to the position where the temperature element 2 can be inserted.
Is provided to penetrate.

The printed circuit board 5 protrudes from the lower surface and solders the temperature element 2 to fix it. As the temperature element 2, all elements that can detect the temperature in contact with or close to the surface of the battery 1, for example, a thermistor or a varistor are used. Further, as the temperature element 2, a temperature fuse that detects the temperature and directly interrupts the current, or an element such as a PTC whose resistance sharply increases as the temperature rises can be used. The printed circuit board 5 has, on the upper surface thereof, other electronic components such as a resistor, a capacitor, and a one-chip microcomputer that are built in the battery pack.
SI etc. can be fixed.

The printed circuit board 5 is connected to the wiring fixed to the case 3B by a method such as spot welding of lead wires. Further, the wiring of the case 3B is connected to the electrode of the built-in battery 1 via the lead wire.

The battery pack having the above structure is assembled as follows. Electronic components such as the temperature element 2 and LSI are fixed to the printed circuit board 5 by soldering. The printed circuit board 5 is put in the storage section 4 of the case 3B.
At this time, the hole 5A of the printed circuit board 5 is inserted into the boss 9 of the storage section 4.
And the printed circuit board 5 is set at a fixed position via the boss 9. The lead wire is spot-welded to the connection portion of the printed board 5 to connect the printed board 5 to the wiring of the case 3B. The battery 1 is put in the case 3B, a lead wire is welded to the wiring of the case 3B, and the electrodes of the battery 1 are connected to the case 3B. The storage part 4 of the case 3B is covered with the lid 8 to close the opening of the storage part 4. The lid 8 is fixed by inserting the hook 8A into the locking portion 7 of the storage portion 4. The pressing rod 8B of the lid 8 presses the upper surface of the printed circuit board 5, and the printed circuit board 5 is fixed by being sandwiched between the pressing rod 8B and the boss 9. The cases 3A and 3B are connected to close the case 3.

[0018]

The battery pack of the present invention has a feature that the temperature element can be easily and easily mass-produced by fixing the temperature element with a unique structure, and the temperature element can be surely arranged at an accurate position. is there. The battery pack of the present invention has a case in which a storage part is provided, a printed circuit board having a temperature element fixed therein is stored in the storage part, and a window is opened at the bottom of the storage part to fix the temperature element fixed to the printed circuit board. This is because the battery temperature is detected by exposing the battery inside the case and disposing the temperature element at a fixed position. The printed circuit board on which the temperature element is fixed is arranged in a fixed position in the case where the printed circuit board is fixed. Therefore, there is a feature that the printed circuit board can be simply and easily arranged at an accurate position so as not to move. Unlike the conventional battery pack, it is not necessary to arrange the printed circuit board with lead wires in a fixed position. Further, since the temperature element of the printed circuit board is exposed in the case through the window opened at the bottom of the case, there is a feature that the temperature element can accurately detect the battery temperature. Furthermore, since the temperature element is fixed to the printed circuit board, there is a feature that the wiring work of the temperature element can be simplified.

[Brief description of drawings]

FIG. 1 is a sectional view showing an example of a conventional battery pack.

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

3 is a cross-sectional view of the battery pack shown in FIG.

FIG. 4 is an exploded sectional view of the battery pack shown in FIG.

FIG. 5 is a plan view showing a part of case 3;

FIG. 6 is a cross-sectional view and a bottom view of a lid that closes the storage portion of the case 3.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Battery 2 ... Temperature element 3 ... Case 4 ... Storage part 4A ... Bottom plate 4B ... Convex strip 5 ... Printed circuit board 5A ... Hole 6 ... Window 7 ... Engagement part 8 ... Lid 8A ... Hook 8B ... Press rod 9 ... Boss

Claims (1)

[Claims] 1. A battery pack in which a battery (1) is built in a case (3) and has all the following configurations. (A) The case (3) is a storage part for the printed circuit board (5).
Have (4). (B) The case (3) has a bottom plate (4A) for partitioning the printed circuit board (5) and the built-in battery (1) at the bottom of the storage section (4). (C) The printed circuit board (5) projects from the surface to fix the temperature element (2). (D) On the bottom plate (4A) of the storage section (4), the temperature element (2)
A window (6) for opening the inside of the case (3) is opened. (E) The printed circuit board (5) is placed in the housing (4) of the case (3).
The temperature element (2) of the printed circuit board (5) is
It is exposed from the window (6) to the inner surface of the case (3) and is in contact with or close to the surface of the battery (1).