JPS5831321Y2 - flat battery - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of a flat battery, and in particular aims to improve current collection performance by using an improved current collector plate.

An embodiment of the present invention will be described below with reference to the drawings, taking a flat nonaqueous battery as an example. Reference numeral 1 denotes a sealing lid that also serves as a negative electrode terminal, and an insulating backing 2 made of polypropylene is integrally attached to the periphery of the lid. It is shaped.

Reference numeral 3 denotes a negative electrode plate obtained by punching a rolled lithium plate into a predetermined shape, and is crimped to a negative electrode current collector network 4 spot-welded to the inner bottom surface of the sealing lid 1.

5 is a positive electrode plate formed by adding a conductive agent and a binder to a manganese dioxide active material and press-molding it; 6 is a separator for separating the positive and negative electrode plates, and is made of a polypropylene nonwoven fabric;
Propylene carbonate is impregnated with a specified amount of electrolyte that dissolves lithium perchlorate.

Reference numeral 7 denotes a positive electrode current collector plate which is the gist of the present invention, and is interposed between the battery container 8 and the positive electrode plate 5, which also serves as a positive electrode terminal and whose inner bottom surface serves as a seat for the insulating backing. There is.

As shown in FIG. 3, this current collector plate has a peripheral portion 7a,
It has a W-shaped cross section such that when pressure in direction A is applied to 7a, pressure in direction B in the opposite direction is applied to central portion 7b.

Further, reference numeral 9 denotes an electrolyte-resistant soft layer made of, for example, silicone resin and formed only on the peripheral edge portions 7a, 7a excluding the connecting portion between the peripheral edge portion and the center portion of the current collector plate.

Now, in this type of flat battery, a method is used to collect current by pressing the positive electrode plate against the inner bottom surface of the battery container, which also serves as the positive terminal, using the sealing pressure when the battery is sealed. There was a concern that deformation of the battery container would occur, increasing contact resistance and deteriorating battery performance.

Furthermore, a method has been proposed in which a positive electrode current collector plate having a diameter smaller than the positive electrode plate is fixed to the inner bottom surface of the battery container by spot welding, but the installation of the positive electrode current collector plate is complicated.

In contrast, according to the battery structure of the present invention, an insulating backing placed on the inside bottom of the battery container is brought into contact with the peripheral edge of the positive current collector plate placed on the inside bottom of the battery container, and the opening edge of the battery container is When the current collector plate is sealed, the peripheral edge of the current collector plate is sandwiched between the insulating backing and the battery container, improving the current collection between the battery container and the current collector plate. Since a force is applied in the direction of pressing the current collector plate to the positive electrode plate, the current collection property between the current collector plate and the positive electrode plate is improved, and therefore the current collection between the battery container and the positive electrode plate is improved without being affected by the deformation of the battery container. Improves sex.

:. In addition, the positive electrode current collector plate can be fixed by the pressing force of the insulating backing without being fixed by spot welding and without positional deviation, thereby simplifying the workability during assembly.

□Furthermore, the insulating backing of the current collector plate (the periphery of the current collector plate that comes into contact with it is coated with a soft layer that is resistant to electrolyte), so that hard insulating nosetting can be used at the joints with the current collector plate and between the current collector plate and the battery container. Since the soft layer is located in the area, adhesion is improved and leakage resistance is also excellent.

In this case, the electric connection with the electric current collecting plate is made by the connection between the peripheral edge and the center of the current collecting plate coming into pressure contact with the inner bottom surface of the battery container.

It is clear that the present invention is not limited to the non-aqueous batteries shown in the embodiments, but can also be applied to alkaline batteries.

[Brief explanation of the drawing]

The drawings are all related to the present invention; FIG. 1 is a longitudinal sectional view of the battery, FIG. 2 is a state diagram during the assembly process, and FIG. 3 is a sectional view of the current collector plate. :゛1...Sealing lid, 2...Insulating backing, 3...Negative electrode plate, □5...Positive electrode plate, 6... -Separator, 7...Positive electrode current collector plate, 8...Battery container,;9;...Soft layer.

Claims (1)

[Scope of Claim for Utility Model Registration] ■ An insulating backing provided around the periphery of the sealing lid is placed on the inner bottom surface of the battery container as a seat, and the sealing lid is caulked and attached to the opening edge of the battery container through the insulating backing. The inner bottom surface of the battery container is such that a peripheral portion thereof is pressed between the insulating backing and the inner bottom surface of the battery container, so that a pressure contact force is applied to the center portion of the power generation element body. A flat battery with a current collecting plate having a W-shaped cross section interposed therebetween. (2) A utility model registration claim described in item (2), characterized in that the peripheral edge of the current collector plate except for the connection between the peripheral edge and the center is covered with an electrolyte-resistant soft layer. flat battery.