JPS5910692Y2 - battery - Google Patents

Description

[Detailed description of the invention] This invention relates to a flat battery that uses light metals such as lithium and aluminum as negative electrode active materials, and its purpose is to prevent internal short circuits of the battery and improve leakage resistance. There is a particular thing.

Below, one embodiment of the present invention will be explained based on the drawings.
In the drawings and FIG. 2, reference numeral 1 denotes a sealing lid which also serves as a negative electrode terminal, and an insulating packing 3 is disposed on the peripheral edge 2 of the lid by an insert type.

Reference numeral 4 denotes a battery container which also serves as a positive electrode terminal, and an anode current collector plate 5 is fixed to the inner bottom surface of the container by spot welding or the like. A separator 7 impregnated with a non-aqueous electrolyte is placed.

Reference numeral 8 denotes a negative electrode plate made of a light metal such as lithium or aluminum, which is press-bonded to the inner bottom surface of the sealing lid 1.

Thus, the inner surface of the insulating packing 3 is covered with a dish-shaped sealing lid 1.
bulges inward from the outer diameter of the inner bottom surface of the insulating packing 3, and the upper part of the inner side of the insulating packing 3 is partially cut out. Place 9 is shaped.

This recess 9 is formed integrally with the insert of the insulating packing 3.

When the negative electrode plate 8 as shown in FIG. 2B is pressed onto the sealing lid 1, the peripheral edge extension 81 of the negative electrode plate 8 fits into the recess 9.

Now, in the conventional battery structure of this type, when the negative electrode plate 8' is crimped onto the sealing lid 1', as shown in FIG.
Since the peripheral edge extension 81' protrudes along the inner surface of the insulating packing 3' toward the opposite electrode, there is a fear that it may break through the separator and come into contact with the opposite electrode, causing an internal short circuit.

Furthermore, in order to prevent the peripheral edge extension 81' from protruding toward the counter electrode as much as possible, it is not possible to increase the pressure of the negative electrode plate so much that the sealing lid 1' and the negative electrode A negative electrode current collector plate 10 is interposed between the negative electrode current collector plate 10 and the negative electrode current collector plate 10 to enhance current collection efficiency.

On the other hand, according to the battery structure of the present invention, a part of the upper part of the inner side of the insulating packing 3 is cut out to provide an annular recess 9 formed by the inner bottom surface of the sealing lid 1 and the inner upper surface of the insulating packing 3. Therefore, there is no problem that the peripheral edge extension 81 of the negative electrode plate 8 would fit into the recess 9 and cause an internal short circuit.

Furthermore, as described above, since the peripheral edge extension 81 of the negative electrode plate 8 does not protrude toward the counter electrode, the crimp force of the negative electrode plate 8 can be increased. The electrical connection state between the lid 1 and the negative electrode plate 8 can be maintained well, and the number of parts can be reduced.

Furthermore, since the peripheral edge extension 81 of the negative electrode plate 8 fitted into the recess 9 remains without taking part in the battery reaction, it is It is possible to prevent the leakage of the electrolyte solution and improve the leakage resistance.

As described above, the battery structure of the present invention has various practical effects.

[Brief explanation of the drawing]

Figures 1 and 2 relate to the present invention; Figure 1 is a longitudinal cross-sectional view of the battery, Figure 2A is a cross-sectional view of the main part before the negative electrode plate is crimped, and Figure 2B is the negative electrode plate after being crimped. Fig. 3 is a sectional view of the main part in the state of the conventional battery, Fig. 3A is a sectional view of the main part before the negative electrode plate is crimped, and Fig. 3B is a sectional view of the main part with the negative electrode plate crimped. Show each. DESCRIPTION OF SYMBOLS 1... Sealing lid, 3... Insulating packing, 4... Battery container, 6... Positive electrode plate, 8... Negative electrode plate made of light metal, 81... Peripheral extension of negative electrode plate, 9...Four annular portions formed by the inner upper surface of the insulating packing and the inner bottom surface of the sealing lid.

Claims (1)

[Scope of utility model registration request] The inner surface of the annular insulating packing disposed around the periphery of the dish-shaped sealing lid, which also serves as a negative electrode terminal, bulges inward from the outer diameter of the inner bottom surface of the sealing lid, and the inner surface of the insulating packing has an upper inner surface. An annular recess is formed by the inner bottom surface of the sealing lid and the inner upper surface of the insulating packing, and a peripheral extension of a negative electrode plate made of a soft metal that is crimped onto the inner bottom surface of the sealing lid is inserted into the annular recess. A battery that is inserted into a place.