JPH0475250A - Battery pack - Google Patents

Abstract

PURPOSE:To obtain a battery of good capacity efficiency by holding a terminal holder by means of a pair of split cases in such a manner that the cases each having a recess in its inner face surround the same, and sticking the inner surface of each case to the surface of a flat cell with an adhesive. CONSTITUTION:Current collecting plates 4,5 are each electrically connected to a positive or negative electrode plate. The current collecting plates 4,5 each of which has a film of synthetic resin material and a metallic plate both laminated to one side thereof are thermally welded to each other so as to form a flat cell 7. A terminal holder 10 which has terminal plates 8,9 electrically connected to each other by spot welding while being opposite to the current collecting plates 4, 5 is disposed on the side face of the flat cell 7. A pair of upper and lower cases 11, 12 are each recessed at its inner face and the outer peripheral portions of the cases 11, 12 have respective portions to be fitted with each other. These fitting portions are joined together by means of ultrasonic welding. A battery pack formed therefore has almost no space in the internal structure of the battery 7 nor between the battery 7 and each case 11, 12, providing an integrated structure as a whole.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a battery bag, and more particularly to the structure of a battery bag used as a power source for portable equipment and the like.

Prior Art Conventionally, this type of battery bag has a positive electrode and a negative electrode at both ends.
Line up a plurality of cylindrical batteries 23, connect each pole with a lead plate 24 by spot welding, and connect lead wires 25 and 26 to the positive and negative poles of the batteries at both ends. Terminal board 28.2 provided in case 27
The unit cell 23 had a structure as shown in FIG. 5, in which the battery 23 was connected to a pair of upper and lower cases 27 to extract electric power.

Problems to be Solved by the Invention However, in such a conventional structure, it takes a lot of man-hours to connect the unit cells 23, and lead wires 25.2 for connection are required.
6 space was taken up, and the fixing of the unit cell 23 was unstable, causing problems in soldering between the lead wires 25, 26 and the terminal plates 28, 29.

As a result, the external dimensions of the case 27 become large, resulting in a battery with poor volumetric efficiency. Furthermore, as a power source for portable devices, two to three spare batteries are required, and these are often carried around. Therefore, the battery pack must have a structure that is resistant to drop impact. In this respect as well, conventional battery packs have 23 unit cells.
The gap between the case 17 and the case 17 is large, and the thinner the case 17 is, the weaker the structure becomes.

If the unit battery to be packed is a small sealed lead acid battery,
Because the battery itself is heavy, it was not possible to increase the overall strength by using ribs to support the gap between the battery and its case to eliminate looseness.

The present invention solves these problems and aims to provide a battery bag with good volumetric efficiency and excellent impact resistance.

Means for Solving the Problems In order to solve this problem, the battery pack of the present invention includes a pair of split cases having recesses on the inner surface, which surrounds and holds the terminal holder, and connects the inner surface of the case with the flat unit cell. The case and the flat cell are integrated by fixing their surfaces with adhesive and by ultrasonic welding the joints between the cases.

Effect With this configuration, the battery pack of the present invention holds the terminal holder so as to surround it from the periphery with a pair of cases having recesses on the inner surface, and the inner surface of the case closely covers the flat unit cell, thereby making it possible to securely hold the terminal holder. There is almost no gap between the cell battery and the case, and the terminal holder is firmly held by the pair of cases, resulting in an integrated structure as a whole.

In order to prevent the current collector plate and the inner surface of the case from coming into close contact with each other due to the bulge of the terminal plate spot-welded to the surface of the current collector plate of the flat cell, the front terminal plate bulges on the inner surface of the case. By providing a shallow recess in the battery pack, the battery pack can be bonded tightly, and both inner surfaces of the case and the surface of the current collector plate are fixed with adhesive, and the fitting part of the case is Join by sonic welding.

EXAMPLE Hereinafter, a battery/ivy according to an example of the present invention will be explained based on the drawings. In Figures 1.2.3 and 4, 1
2 is a positive electrode plate, 2 is a negative electrode plate, 3 is a seven-layer plate, and these are combined to form an electrode plate group. 4 and 5 are current collector plates laminated with a synthetic resin film material and a gold a plate on one side. in,
A synthetic resin film is directed to the surface in contact with the electrode plate group and sandwiched from both sides, and the current collector plates 4 and 5 are electrically connected to the positive electrode plate 1 or the negative electrode plate 2, respectively. Reference numeral 6 denotes a synthetic resin body that surrounds the electrode plate group, and is thermally welded to the current collecting plates 4 and 5, each of which has a synthetic resin film material and a metal plate laminated on one side, to form a flat unit cell 7. A current collector plate 4 is placed on the side of this flat cell 7.
, 5, a terminal holder 10 having a terminal plate 8.9 which is electrically connected by cross-welding is arranged. 11.1
Reference numeral 2 denotes a pair of upper and lower cases 11.12 that surround and hold the terminal holder 10 from the periphery and at the same time cover the entire surface of the flat cell 7 in close contact with the flat cell 7. The inner surface of case 12 is recessed, case 11.1
The outer peripheral portions of the two have portions that fit into each other. These mating parts are joined by ultrasonic welding. 17 is the joint portion thereof. Therefore, the completed battery pack has an entirely integrated structure with almost no gaps between the flat cell 7 and its cases 11 and 12, as well as the internal structure of the flat cell 7.

In order to prevent the current collecting plates 4.5 and case inner surfaces 11', 12' from coming into close contact with each other due to the bulges of the terminal plates 8, 9 spot-welded to the surfaces of the current collecting plates 4, 5 of the flat cell 7, the case is By providing shallow recesses 13 and 14 corresponding to the terminal plate dusty portions on the inner surfaces 11' and 12', the battery pack can be brought into close contact with each other more completely.

Also, both inner surfaces 11'12' of the case 11.12
Both the current collector plates 4 and 5 are fixed with an adhesive 15, 16, and the fitting portions of the upper and lower pair of cases 11, 12 are joined by ultrasonic welding to make them stronger.

Effects of the Invention As is clear from the above description of the embodiments, the battery bag of the present invention, unlike the conventional structure, greatly simplifies the number of steps required to electrically connect the flat unit cells, and makes the electrical connection easier. There is no need for lead wires, which eliminates wasted space and allows for a compact design. The fixation of the flat battery is stable, and the connection between the lead wire and terminal plate is completed by simple spot welding instead of soldering. This eliminates many troubles that often occur in soldering.

As a result, the external dimensions of the case are reduced, making it possible to provide a battery with good volumetric efficiency. In addition, the battery pack used as a power source for portable devices has a structure that is resistant to impact from being dropped. In this respect as well, it is possible to reduce the gap between the flat cell and the case, which could not be achieved with conventional battery packs, and to create a strong battery pack even if the case is thin.

Even if the battery is heavy, such as a small sealed lead-acid battery, the overall strength can be increased by eliminating the gap between the battery and the case, and by integrating all parts such as the case and the battery.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an exploded configuration of a battery pack according to an embodiment of the present invention, and Fig. 2 is an external appearance 7 of the battery pack.
Flat cell, 10...Terminal holder 11.1
2...Case, 15.16...Adhesive.

Claims (1)

[Claims] An electrode plate group consisting of a positive electrode plate, a negative electrode plate, and a separator is sandwiched between one side of the current collector plate, which is laminated with a synthetic resin film material and a metal plate, with the synthetic resin film facing the electrode plate group on the surface that contacts the electrode plate group. The current collector plate is connected to the positive electrode plate or the negative electrode plate, respectively, and is connected to the side face of the flat cell, which is thermally welded to a synthetic resin body surrounding the electrode plate group, facing the current collector plate. A terminal holder having a terminal plate is arranged, the terminal holder is held so as to be surrounded from the periphery by a pair of split cases having recesses on the inner surface, and the inner surface of the case and the surface of the flat unit cell are respectively bonded. A battery pack in which the case and the flat cell are integrated by fixing them with an adhesive and by ultrasonic welding the joint portion of the case.