JP2545123Y2 - Battery pack - Google Patents

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 rectangular battery, an overcurrent or overheat protection element, and a substrate housed in a case.

[0002]

2. Description of the Related Art A battery pack having a plurality of batteries housed in a case requires a large current to flow or an abnormal heating of the batteries, in which case the current flowing to the batteries must be cut off or the current must be reduced. Yes, as shown in Japanese Utility Model Laid-Open No. 55-149263, an overheat protection element such as a thermal fuse or a thermostat, or an overcurrent protection element such as a current fuse or a breaker is connected in series to a battery, and the battery is placed in a case together with the battery. It is common to store. In recent years, a plurality of charging terminals are provided, and a printed circuit board on which various switching elements, diodes, and other elements are mounted has been housed in a battery pack case.

[0003] On the other hand, with the miniaturization of equipment using batteries, miniaturization and high capacity of battery packs have been required.
Attention has been paid to a battery pack using a rectangular battery which is more volume-efficient when constituting a pack battery than a conventional cylindrical battery, and can be reduced in size and increased in capacity.

However, a battery pack containing a rectangular battery in a case has no extra space in the battery as compared with a conventional battery pack containing a cylindrical battery in the case. When the printed circuit board was inserted into the case, the thickness of the battery pack was increased by the thickness of the element, and the battery pack could not be sufficiently reduced in size and thickness.

[0005]

The present invention provides a printed circuit board on which an overcurrent or overheat protection element and an electronic component are mounted,
It is intended to reduce the size and the capacity of a battery pack housed in a case together with a battery.

[0006]

SUMMARY OF THE INVENTION The battery pack of the present invention comprises:
A battery group in which side surfaces of a plurality of flat rectangular batteries are arranged side by side , an overcurrent or overheat protection element, and a flexible printed circuit board on which terminals and electronic components are mounted are housed in a case, and the protection element is The flexible printed circuit board is interposed between adjacent square batteries ,
Arranged along one side of the battery group,
It has a foldable location, the space between cells formed by through interpolation of the protective element, before bending the substrate
The electronic component is provided.

[0007]

When a rectangular battery is used as a battery to be housed in a battery pack, the space in the case can be effectively used without generating an extra space between the valleys of the battery as in the case of using a conventional cylindrical battery. it can.

Further , a flexible printed circuit board is used.
Connection between the battery group and the terminals and electronic components
Easy to do, but with gaps unlike cylindrical batteries
Even square batteries that do not
Therefore, the external shape should be almost the same size as the battery group.
Can be.

[0009] Then, by inserting the protective element, the shape between the batteries is formed.
Bend the board and place electronic components in the space created.
To make effective use of the space in the case
Can be. In addition, flexible printed circuit boards are optional
Since the battery can be folded at the position, for example,
In this case, four rows are formed between adjacent batteries,
Bend at any position that does not interfere with the placement of the child
Can be Furthermore, the flexible print base
Since the plate is arranged along one side of the battery group, the battery
Press so that the interposed protective element does not protrude from between the batteries.
Also serves as a supporting function.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below.

FIG. 1 is an exploded perspective view of the battery pack of the present invention.
2 is a perspective view showing a state before the flexible lulint board is mounted on the battery group, FIG. 3 is a perspective view showing a state where the flexible printed board is mounted on the battery group, and FIG. 4 is a perspective view of the flexible printed board.

In the drawing, reference numeral 1 denotes a prismatic battery whose side peripheral surface is covered with a heat-shrinkable tube. Electrode terminals exposed on end faces of adjacent batteries are juxtaposed so as to be terminals of different polarities, forming a battery group. I have. A breaker 2 is arranged between the batteries of this prismatic battery 1, and its terminals 3, 3 are spot-welded to the electrode terminals of the adjacent batteries, and the batteries 1 constituting the battery group are connected in series by a lead plate 4. It is connected.

Reference numeral 5 denotes a flexible printed circuit board, and a field effect transistor (FET) 6
An electronic component (surface-mounted component) including a diode 6, a thermistor 8, a thermistor 8, and a resistor 9, a charging terminal 10 of the battery pack is mounted near the other end by reflow soldering. A pair of discharge terminals 11 are similarly mounted inside the substrate 5 spaced apart from the charge terminals 10. Further, connection portions 12 and 12 for connecting to the battery group are formed on the substrate so as to protrude from the substrate 5, and the metal plate 14 is soldered so as to bridge the cutout 13 provided at the end of the connection portion 12. After bending the broken lines A and B of the substrate 5, the metal plate
The battery group and the flexible printed circuit board 5 are electrically connected by spot welding 14 to the electrode terminal of the battery 1 serving as a terminal of the battery group.

When the flexible printed board 5 is connected to the battery group, the vicinity of the portion where the electronic components are mounted on the board 5 is bent in the direction of the arrow in FIG. The electronic component is inserted into the space 15 formed between them. Next, these battery groups, breaker 2 and printed circuit board 5 are connected to upper case 16 and lower case 16.
The charging terminal 10 housed in the battery case made of 17 and fixed to the flexible printed circuit board 5 is engaged with the standing piece 18 formed on the lower case 17, and the discharge terminal 11 is provided on the bottom surface of the lower case 17. The battery pack of the present invention is constructed by exposing the battery pack from 19.

As shown in FIG. 1, the battery pack thus constructed can be made thinner and smaller without generating extra space in the battery, and has a larger capacity per unit volume and a higher capacity. Can also be achieved.

[0016]

[Effect of the Invention] The battery pack of the present invention has a plurality of flat rectangular
A battery group in which the sides of the batteries are
Is an overheat protection element and a frame with terminals and electronic components mounted.
The kibble printed circuit board is stored in the case,
The protection element is interposed between adjacent square batteries, while
The flexible printed circuit board is provided on one side of the battery group.
It can be folded at any position while being placed along
And the voltage formed by the insertion of the protection element.
Bend the board and insert the electronic components into the space between the ponds
The flexible feature
The printed circuit board facilitates wiring inside the case,
The role of holding the child parts can also be used. The result
As a result, it is possible to reduce the size and increase the capacity of the battery pack without generating unnecessary extra space in the battery pack.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of the battery pack of the present invention.

FIG. 2 is a perspective view showing a state before a flexible lulint board is attached to a battery group.

FIG. 3 is a perspective view showing a state in which a flexible printed circuit board is mounted on a battery group.

FIG. 4 is a perspective view of a flexible printed circuit board.

[Explanation of symbols]

 Reference Signs List 1 battery 2 breaker (overcurrent or overheat protection element protection element) 5 flexible printed circuit board 6 FET (electronic component) 7 diode (electronic component) 8 thermistor (electronic component) 9 resistor (electronic component) 15 space 16 upper case 17 lower case

Claims (1)

(57) [Scope of request for utility model registration] Claims: 1. A plurality of flat rectangular batteries are arranged side by side.
A cell group arranged, overcurrent or overtemperature protection device, terminal
And the electronic component is to housed in the case and a flexible printed circuit board mounted, the protective element is inserted between the rectangular cells adjacent, whereas, the flexible printed
The substrate is arranged along one surface of the battery group.
A, it has a bendable at any position in the space between the cells formed by the through interpolation of the protection element, the substrate
A battery pack, wherein the electronic component is bent and inserted.