JPH0451456A - Sealed type storage battery - Google Patents

Abstract

PURPOSE:To provide a high reliability safety valve which requires small space for installation by forming a battery jar from two plastic sheets put one over another, furnishing a gas chamber, a gas passage leading from it to the opening on the inside of battery, and an exhaust port opening to outside the battery in the gas chamber, arranging in contact a film-shaped valve element through oil at the gas chamber side opening of the passage, and thus constituting a valve part. CONSTITUTION:A battery jar (1A, 1B) is formed from two plastic sheets put one over another, where a gas chamber 8 accommodating oil 6 and film-shaped valve element 5, a passage 9 leading from the chamber 8 to an opening 10 on the inside of the battery, and an exhaust hole 11 opening to outside the battery are furnished, the exhaust hole 11 being provided at the gas chamber 8. In contacting, the film-shaped valve element 5 is arranged at the gas chamber side opening of the passage 9 through the oil 6, and thus the valve part is constituted.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to sealed storage batteries, in particular to thin sealed storage batteries.

2. Description of the Related Art In recent years, with the miniaturization of portable devices, it has become increasingly desirable for storage batteries used as power sources to be thinner and have higher capacity per unit volume. In response to these demands, thin storage batteries using synthetic resin films as batteries have been developed.

Conventionally, in sealed lead-acid batteries in which the electrode plate group is covered with a synthetic resin sheet, as described in JP-A-63-185085, JP-A-63-133665, JP-A-63174265, etc. Furthermore, since the planar area of the battery is the sum of the electrode plate group and the safety valve section, it is an obstacle to increasing the capacity per volume. Further, the position where the safety valve is provided is limited to the vicinity of the electrode plate group, and the degree of freedom in design is low.

Problems to be Solved by the Invention In this type of conventional battery, there is a limit to reducing the area occupied by the safety valve in terms of improving capacity, and the positions where the safety valve can be provided are structurally limited.

Furthermore, since oil is interposed in the same package as the electrode plate group, there is a problem that the oil may enter the electrode plate group and reduce battery performance.

Means to solve the problem A battery case is constructed using two laminated synthetic resin sheets,
An air chamber containing oil and a film-like valve body, an air passage leading from the air chamber to an opening on the inside of the battery, and an exhaust port opening to the outside of the battery in the air chamber. The valve portion is constructed by arranging film-like valve bodies in contact with each other.

The operational safety valve requires only the area necessary to provide a small hole inside the battery, and airtightness is achieved by connecting the opening on the inside of the battery of the air chamber provided in the battery case to the oil-coated surface of the film-like valve body placed in contact with it. Retained at the interface.

As the example battery case IA, a polyethylene terephthalate layer (hereinafter referred to as [PETJ]) 2 with a thickness of 12 μm was prepared in order from the outside.
, a laminate of a stainless steel layer (hereinafter referred to as rSUSJ) 3 with a thickness of 60 μm and an unstretched polypropylene layer (hereinafter referred to as “CPP”) 4 with a thickness of 30 crn or PET 2
The other battery case "B" was made of PET, 15 μm thick polyvinylidene chloride layer, and C.
A layered material made of PP4 was used.

Further, PET2 was used for the film-like valve body 5, and silicone oil was used for the oil 6, respectively.

However, if the film-like valve body 5 is simply disposed, there is a risk that the film-like valve body 5 will shift and expose the air chamber side lower part.
Misalignment can be prevented by surface tension with the coated surface.

The air chamber 8, the air passage 9, and the air chamber side lower part are formed by etching or laser processing before laminating the SUS 3. The battery internal side opening 10 of the CPP4 is S U
Since S3 and cpP4 are processed after being laminated, there is no need for alignment.

Extend the air chamber 8 in any direction around the battery periphery, or
By providing the exhaust port 11 at an arbitrary position on the plane of 'II' 2, the exhaust port 11 can be provided at an optimal position depending on the mounting state of the battery in the device.

In addition, the opening 10 on the battery rJ side can be provided at any position on the outer periphery of the electrode plate group 13 in the slight gap between the joint 12 of the electrodes i1A and IB and the electrode plate group 13, and the battery edge flat area It is possible to significantly reduce the proportion of Further, by making the ventilation path 9 longer as shown in FIG. 3, the intrusion of oil 6 into the battery can be much reduced compared to conventional batteries.

Effects of the Invention As mentioned above, the present invention has great industrial value, such as being able to provide a safety valve with high reliability in an extremely small space and increasing the volumetric efficiency of battery capacity. It is.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view of the sealed storage battery of the present invention, FIG. 2 is a sectional view taken along the line A-A in FIG. 1, and FIG. 3 is a sectional view of essential parts of the sealed storage battery of the invention. IA, IB are battery cases, 2 is P E '1', 3 is SUS,
4 is a CPP, 5 is a film-like valve body, 6 is oil, 8 is an air chamber, 9 is a ventilation passage, 10 is an opening on the inside of the battery, and 11 is an exhaust port.

Claims (1)

[Claims] The battery case is constructed using two laminated synthetic resin sheets, with an air chamber containing oil and a film-like valve body, an air passage leading from the air chamber to an opening on the inside of the battery, and an exhaust opening to the outside of the battery in the air chamber. What is claimed is: 1. A sealed storage battery characterized in that the valve part is configured by having an opening and a film-shaped valve element being placed in contact with the opening on the air chamber side of the air passage via oil.