JPS5824380Y2 - Heat sealed storage battery - Google Patents

Description

[Detailed description of the invention] Conventionally, a type of storage battery is known in which a battery case 1 and a lid body 2 are heat-sealed at opposing joint edges of equal thickness.
If the thickness of the opposite joining edge is the same or the thickness of the upper facing joining edge is thicker than that of the lower joining edge, when the two are welded under heat and pressure, the molten resin will droop, the welding surface will decrease, and the heat There is a drawback that the heat-sealability of the seal portion is reduced and defects occur.

Furthermore, if there is a significant difference in the thickness of the opposing joining edges to be melted against heat, the joining edges with smaller thickness will melt too much, making it difficult to weld them together, resulting in deterioration of heat sealing properties.

The present invention solves these drawbacks and provides an economical heat-sealable storage battery that can smoothly and reliably heat-seal the battery case and the lid, improve the heat-sealability, and provide an economical heat-sealable storage battery. The opposing joining edge surfaces 1a and 2b of equal thickness, which are provided vertically facing each other, are welded together by heat, and at the time of heat welding, either one of the battery case 1 or the lid 2 disposed below is heated and welded. On the other hand, only at the four corners of the opposing joint edge surfaces 1a or 2a, the non-joint receiving surfaces 3.3, 3.3, which are not subjected to heat melting extend and bulge inward at the same surface height along the inner surface.
It consists of 3.

A preferred embodiment of the present invention will be described with reference to the accompanying drawings.

In the drawings, 1 indicates a thermoplastic synthetic resin battery case;
The entire circumferential side edge and the partition edge thereof all have opposing joining edge surfaces 1a of the same width, and are unchanged from the conventional battery case shape.

In the present invention, when the battery case 1 is placed on the upper side and is heat-sealed to the lid body 2 placed on the lower side with the back side facing upward,
Applied to the lid body 2, the lid body 2 except for its four corners,
The width of the opposing joining surfaces 2a of the peripheral edge and the partition edge is the same as the width of the opposing joining edge 1a of the battery case 1, and each corner 4 of the peripheral edge has its In addition to the opposing joint surface 2a, a non-joint receiving surface 3 which is not subjected to heating and melting and extends and bulges inward at the same surface height along the inner surface thereof is provided in a projecting manner during molding.

Reference numeral 5 denotes a protective wall projecting upward to the outside of the facing joint surface 2a on the circumferential side, which surrounds the outer peripheral surface of the upper edge of the protective wall when joined to the battery case 1.

Thus, when the facing joint edges 1a and 2b of the battery case 1 and the lid body 2 are heated and melted by the usual method and in this state they are joined and pressure-bonded to each other as shown in the third figure, the melt that protrudes during pressure welding. Since the resin is received by the receiving surface 3 that protrudes inwardly and solidifies there without flowing away, the heat sealing of the iron part is strengthened accordingly, and the mechanical bond is also increased.

In particular, the problem of molten resin flowing out during heat sealing is
Since this is likely to occur at the four corners, it is sufficient to provide the receiving surfaces 3 protruding only at the four corners as described above, and the joint edge surfaces 2a and 1
Since it is not necessary to provide it over the entire length of a, it is possible to obtain an economical storage battery with improved heat sealability without increasing the manufacturing cost.

Incidentally, when the battery case 1 is disposed on the lower side and the lid body 2 is disposed on the upper side and they are heat-sealed to each other, it goes without saying that the non-bonding receiving surface 3 is provided protrudingly on the side of the lower battery case 1.

In this way, according to the present invention, since the battery case 1 and the lid body 2 are heat-welded to each other at the opposing joining edge surfaces 1a and 2a having the same thickness, a smooth and reliable heat seal can be obtained. Opposing joint edge surface 1a placed below during heat welding
Or a non-bonded bearing surface 3 that is not subjected to heat melting and extends inwardly at the same surface height along the inner surface only at the four corners of 2a.
Since each of the receiving surfaces 3 can reliably stop the heat-welded resin from hanging down, there is no need to provide the receiving surfaces 3 around the entire circumference of the opposing joining edge surface 1a or 2a. However, the heat-sealing properties of the storage battery are improved, and an economical and lightweight heat-sealable storage battery can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of one embodiment of the present invention, FIG. 2 is an enlarged perspective view of a portion thereof, and FIG. 3 is a cutaway side view of a portion of the battery during heat sealing. 1...Battery case, 2...Lid, 1a...
... Opposing joint surface of the battery case, 1b ... Opposing joint surface of the lid body, 3 ...... Non-joining receiving surface.

Claims (1)

[Scope of utility model registration request] The battery case 1 and the lid body 2 are vertically opposed, and the opposing joining edge surfaces 1a and 2a of equal thickness are heat welded, and at the time of heat welding, either the battery case 1 or the lid body 2 disposed below is heated and welded. On the one hand, only at the four corners of the opposing joint edge surfaces 1a or 2a, there are non-joint receiving surfaces 3, 3, which do not undergo heat melting and extend inwardly at the same surface height along the inner surface thereof. 3. Heat-sealed storage battery with 3.