JPH08185836A - Battery pack - Google Patents

Abstract

PURPOSE: To provide a battery pack using square sealed lead-acid batteries capable of preventing deformation of the battery pack caused by shock such as falling down, and also preventing decrease in battery life caused by dispersing outward of moisture in an electrolyte permeated through a battery jar. CONSTITUTION: A plurality of square sealed lead-acid batteries 3 each comprising a square ABS resin battery jar 1 into which an electrode group consisting of a positive electrode, a negative electrode, and a separator is accommodated and a lid 2 covering an opening of the battery jar 1 are closely arranged laterally in a row. A metal foil 4 whose one side is coated with an adhesive material is stuck in a U-shape over the whole batteries so as to cover the upper and lower long side surfaces to unite the batteries.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery pack in which a plurality of sealed lead acid batteries, preferably an even number, are integrated.

[0002]

2. Description of the Related Art As shown in FIG. 2, a battery pack using a conventional sealed lead-acid battery has an acrylonitrile-butadiene-styrene resin (hereinafter referred to as ABS) containing an electrode plate group consisting of a positive electrode, a negative electrode and a separator. A rectangular battery case 1 made of resin) and a rectangular sealed lead-acid battery 3 composed of a lid 2 that covers the opening of the battery case 1 are used, and the bottom surfaces of the lead-acid battery are butted against each other. A synthetic resin tape 5 having an adhesive applied to one surface was attached in a headband shape to integrate the tape.

[0003]

However, in the battery pack as shown in FIG. 2, the battery pack is held by the synthetic resin tape 5 having weak mechanical strength. There is a problem that the battery pack may be deformed due to shock when dropped.

When this storage battery is left to stand or used for a long time in a high temperature environment, since ABS resin having a large number of microscopic gaps is used for the battery case, the electrolytic solution is passed through the outer wall of the battery case. The gas and water vapor inside were scattered to the outside of the battery. As a result, an increase in the internal resistance and a decrease in the battery capacity are recognized at the same time as the amount of the electrolytic solution decreases, and there is also a problem that the life of the battery is reduced.

The present invention solves such a problem and not only prevents damage and deformation of the battery pack due to impact such as dropping when the battery is used, but also allows water in the electrolytic solution to escape to the outside. The present invention provides a battery pack using a prismatic sealed lead-acid battery that can simultaneously prevent a decrease in battery life caused by a decrease in the amount of electrolytic solution.

[0006]

In order to solve the above-mentioned problems, the present invention provides a battery case made of ABS resin in which an electrode plate group consisting of a positive electrode, a negative electrode and a separator is housed, and an opening of this battery case. A plurality of prismatic sealed lead-acid batteries consisting of an inner lid covering each of them are arranged side by side in close contact with each other, and a metal foil coated with an adhesive on one side is spread over all the batteries arranged side by side. The two long sides are sandwiched and covered so that they are attached in a U-shape and integrated.

[0007]

In the battery pack of the present invention, a metal foil is attached to the long side surfaces of all the batteries to be integrated, and the metal foil is superior in mechanical strength to synthetic resin tape of the same degree. It is possible to prevent the battery pack from being deformed by an impact from. Furthermore, the water blocking function of this metal foil prevents the decrease in the capacity caused by the decrease in the electrolytic solution due to the water in the electrolytic solution permeating the long side surface of the battery case and being dissipated to the outside, thus improving the battery life. Improve.

[0008]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a perspective view of a battery pack comprising the sealed lead acid battery of the present invention in the middle of its construction.

The battery pack of the present invention comprises a battery case 1 made of ABS resin containing an electrode plate group consisting of a positive electrode, a negative electrode, and a separator, and a nominal specification 12V2Ah consisting of a lid 2 covering the opening of the battery case. 2 square sealed lead-acid batteries 3 are used, the bottom surfaces of the two batteries are abutted against each other, and one aluminum foil 4 with a thickness of 20 μm is coated with an adhesive on one side.
The two long side surfaces of each battery were attached to the battery in a U-shape so as to be sandwiched and integrated. The ABS resin battery case had a wall thickness of 2.2 mm.

A battery pack using a sealed lead-acid battery having such a structure is formed by sticking an aluminum foil 4, which has a higher mechanical strength than ABS resin, against the impact of a drop or the like so as to integrally cover the side surface of the pack. Therefore, the aluminum foil 4 does not receive the impact and is not deformed.

As a comparative example, the conventional battery pack shown in FIG. 2 was prepared. Next, using these battery packs, the moisture transmittance on the side surface of the battery pack was measured.

When a synthetic resin tape is attached as in the conventional battery pack, the moisture permeability is 33 g / m ²
On the other hand, when the aluminum foil was attached as in the battery pack of the present invention, the amount was 2.1 g / m ² .

Further, when the aluminum foil 4 is left or used for a long time in a high temperature environment, the aluminum foil 4 for preventing the permeation of water is attached to the long side surface of the battery case 1 so as to cover the same, so that the battery case side wall is formed. Since it is possible to suppress the permeation of water from the electrolyte, it was possible to prevent the decrease of the electrolytic solution.

Further, a life test in trickle charging was conducted using the battery pack of the present invention and the conventional one. Trickle charging was performed at 60 ° C. with a constant voltage of 13.5V. In addition, the discharge capacity at every 3 weeks was measured by discharging at 6 A until the voltage reached 9 V, and the time point when the capacity decreased to 50% of the initial value was judged as the life and evaluated.

As a result, in the case of the battery pack using the synthetic resin tape, the service life reached 4 months, whereas in the present invention with the aluminum foil attached, the service life reached 8 to 9 months, which is about double the service life. It has become possible to improve.

It is considered that this is because the aluminum foil, which can prevent the permeation of water, is attached to the long side surface of the battery case, so that the decrease of the electrolytic solution can be prevented.

[0018]

As described above, the battery pack of the present invention is
Multiple rectangular sealed lead-acid batteries are placed in close contact with each other and arranged side by side, and metal foil is affixed to the upper and lower sides of the batteries across all of the aligned batteries to integrate them and improve the mechanical strength of the pack. Therefore, the battery pack can be prevented from being deformed due to an impact such as a drop. At the same time, the water blocking function of the metal foil can prevent a large amount of water in the electrolytic solution from permeating from the side surface of the battery case.

Therefore, it is possible to provide a battery pack having a long life, which is resistant to an external impact and prevents a decrease in capacity due to a decrease in the electrolytic solution.

[Brief description of drawings]

FIG. 1 is a perspective view of a battery pack using the sealed lead-acid battery of the present invention in the middle of its construction.

FIG. 2 is a diagram showing a battery pack using a conventional sealed lead-acid battery.

[Explanation of symbols]

 1 Battery case 2 Lid 3 Square sealed lead-acid battery 4 Aluminum foil

Claims (1)

[Claims] 1. A prismatic sealed lead acid battery comprising a prismatic battery case made of ABS resin having a positive electrode, a negative electrode and a separator housed therein, and a lid covering an opening of the battery case. A plurality of metal foils are adhered to each other and arranged side by side, and a metal foil coated with an adhesive on one side is spread over all of the plurality of batteries.
An integrated battery pack that is attached in a U-shape so that its upper and lower two long sides are sandwiched.