JP2000208118A - Set battery consisting of nonaqueous electrolyte secondary batteries - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dispense with the care of breakage of a cell voltage detecting line and reduce the laying cost of the cell voltage detecting line by providing printed boards on both positive and negative electrode sides of batteries arranged parallel and on a prescribed side surface, and providing a lead tub and a protecting circuits on the respective boards. SOLUTION: A flexible printed board 1 has a lead tube pattern 5 and a protecting circuit part group 2, and the board 1 is bent on the basis of two bending lines 4 and put over 8 cells 6. The connections between the mutual cells 6 and between the cells 6 and the protecting circuit part group 2 are attained by the pattern 5 provided on the board 1, and lead terminals 3 having the voltage corresponding to the connected 8 cells 6 are drawn out from the protecting circuit part group 2 as the external battery connecting terminals of a set battery. To set the pattern 5 on the board 1, the printing to the inside surface of the board 1 and the nipping by a plurality of board 1 can be both adapted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a secondary device used as a power source for products such as mobile devices such as electric vehicles and electric carts, portable devices such as video cameras and personal computers, backup devices in the event of a power failure, and security devices. In batteries,
The present invention relates to a structure of an assembled battery.

[0002]

2. Description of the Related Art A conventional battery pack is disclosed, for example, in Japanese Utility Model Laid-Open No. 2-842.
As shown in JP-A-63-63, lead tabs are welded to the positive and negative electrodes of a plurality of batteries fixed by winding a tape and connected in series or in parallel. Japanese Patent Application Laid-Open No. 7-235287 discloses a method in which an insulating substrate is provided on both positive and negative electrode sides of a battery, and the battery is connected by lead tabs arranged on the insulating substrate.

[0003]

However, when the connection is made only with the lead tab, it is necessary to fix the battery with an adhesive or the like in order to prevent the battery from rotating, and there is a disadvantage that the manufacturing cost of the assembled battery increases. . When a plurality of non-aqueous secondary batteries are connected in series, the battery is overcharged by detecting the voltage of each battery to prevent the battery from being deteriorated or damaged due to overcharge or overdischarge due to the variation between the batteries. Therefore, a protection circuit for stopping charging and discharging before an overdischarge state is required, and a lead wire (referred to as a single cell voltage detection line) for measuring a voltage from each battery is required. Therefore,
In the method of providing an insulating substrate only on both the positive and negative electrode sides of the battery and connecting the batteries with lead tabs arranged on the insulating substrate, the unit cell voltage detection line is drawn out for each lead tab, and the number of connected batteries When the number increases, the number of detection lines also increases, and the occurrence of disconnection and the like and the manufacturing cost also increase.

[0004]

According to the present invention, there is provided a secondary battery comprising a plurality of non-aqueous electrolyte secondary batteries, a lead tab and a protection circuit, wherein both positive and negative batteries are arranged in parallel. A printed circuit board is provided on a total of three surfaces, one on the electrode side and four on the four side surfaces, a lead tab and a protection circuit are provided on each printed circuit board, and the lead tab and the protection circuit are connected by pattern wiring on the substrate.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a cell 8 showing one embodiment of the present invention.
1 shows an assembled battery structure in which books are connected in series. Lead tab pattern 5, protective circuit component group 2 on flexible printed circuit board 1.
Is provided, and the flexible printed circuit board 1 is bent at two bending references 4 and covered with eight unit cells 6. At this time, the cell 6 and the cell 6 and the cell 6 and the protection circuit component group 2 are connected by the lead tab pattern 5 provided on the flexible printed circuit board 1. Lead terminals 3 with the voltage equivalent to eight connected
Are drawn out as external battery connection terminals of the assembled battery.

Here, the method of installing the lead tab pattern 5 on the flexible printed board 1 may be either printing on the inner surface of the flexible printed board 1 or sandwiching the flexible tab 1 between a plurality of flexible boards.

In the connection portion between the lead tab pattern 5 and the unit cell 6, when the lead tab pattern 5 is exposed on the inner side surface of the flexible printed circuit board 1 as in the above-described installation by printing, the lead tab pattern 5 May be connected to the battery positive electrode 6a and the battery negative electrode 6b, respectively. If the lead tab pattern 5 is not exposed on the inner side surface of the flexible printed circuit board 1 as in the case of installation by sandwiching between the flexible printed circuit boards, the battery connection of the flexible printed circuit board 1 is performed. At least one hole on the inner side of the position
The connection is made after exposing the lead tab pattern 5.

Next, FIG. 2 shows an embodiment in which the flexible printed circuit board 1 used in the present invention is formed in a double-sided printing pattern. The lead tab pattern 5 is provided on the battery connection side of the flexible substrate 1 (back side of the paper), and the unit cell voltage detection pattern 7 is provided on the opposite side (the front side of the paper) of the battery connection side. The lead tab pattern 5 and the cell voltage detection pattern 7 are connected by a through hole 8.

In addition, since the lead tab pattern 5 connecting the protection circuit component group 2 and the battery terminal may be used to detect the voltage of the battery terminal connected to the protection circuit component group 2, the unit cell voltage detection pattern 7 Can be accommodated by installing N-1 batteries with respect to the number N of batteries.

[0010]

As described above, according to the present invention, in a secondary battery comprising a plurality of non-aqueous electrolyte secondary batteries, a lead tab and a protection circuit, both positive and negative electrode sides and four A printed circuit board is provided on a total of three side surfaces, a lead tab and a protection circuit are provided on each printed circuit board, and the lead tab and the protection circuit are connected by pattern wiring on the board, so that a single cell voltage detection line is unnecessary. Therefore, there is no need to worry about disconnection of the cell voltage detection line, and the installation cost of the cell voltage detection line can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an assembled battery structure showing one embodiment of the present invention.

FIG. 2 is a plan view showing one embodiment of a flexible printed board used in the present invention.

[Description of Signs] 1 ... Flexible printed circuit board, 2 ... Protection circuit component group,
Reference numeral 3 represents a lead terminal, 4 represents a bending standard, 5 represents a lead tab pattern, 6 represents a single cell, 6a represents a battery positive electrode, 6b represents a battery negative electrode, 7 represents a single cell voltage detection pattern, and 8 represents a through hole.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Michiko Sakairi 800, Tomita, Ohira-cho, Shimotsuga-gun, Tochigi Pref.

Claims (1)

[Claims] 1. A battery assembly comprising a plurality of non-aqueous electrolyte secondary batteries, a lead tab and a protection circuit, printed on a total of three surfaces, one on both positive and negative electrode sides and four side surfaces of batteries arranged in parallel. Substrates are provided, and lead tabs,
A battery pack comprising a non-aqueous electrolyte secondary battery provided with a protection circuit.