JPS5825561Y2 - cylindrical battery - Google Patents

Description

[Detailed description of the invention] The present invention is a device in which, for example, in a cylindrical non-aqueous battery, a negative electrode plate made of light metal such as lithium or aluminum is wrapped around a negative electrode current collector rod, and a positive electrode plate is arranged on the inner surface of the negative electrode plate. This invention relates to a battery having a structure in which an external terminal is formed by inserting the negative electrode current collector rod into the center of a bottom cylindrical battery container and sealing one end of the negative electrode current collector rod at the open end of the battery container to form an external terminal. The purpose is to improve the performance and assembly workability of this type of battery.

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

1 is a bottomed cylindrical battery container which also serves as an external positive electrode terminal; 2 is a positive electrode plate formed by pressure molding a manganese dioxide active material to which a conductive agent and a binder are added; It is arranged on the inner surface of the battery container 1.

Reference numeral 3 denotes a negative electrode plate made of a rolled lithium plate wound around the outer peripheral surface of a negative electrode current collector rod 4, which will be described later. Reference numeral 5 denotes a separator attached to the outer surface of the negative electrode plate 3, which is made of polypropylene resin cloth.

The negative electrode current collector rod 4 is made of stainless steel, for example, and one end thereof is connected to the negative electrode plate 3 and the separator 5 as shown in FIG.
A hemispherical insulator 4a having a diameter larger than the thickness of the laminate is fixed, and as shown in FIG. An annular projection 4b is formed to prevent the negative electrode current collector rod from being pulled out.

The insulator 4a is made of a synthetic resin such as polypropylene resin, and the annular protrusion 4b is formed by forming a similar synthetic resin into an annular plate and fitting it onto the current collector rod, or by roughening the current collector rod itself. It's okay.

The other end of the current collector rod 4 passes through the sealing body 6 and is used as an external negative terminal.

Now, in this type of battery, as shown in FIG. 3, a negative electrode plate 13 made of a light metal wrapped around a negative electrode current collector rod 14 is surrounded by a bag-like separator 15, and a positive electrode plate 12 is arranged in a cylindrical shape. A structure in which the negative electrode current collector rod 14 is inserted into the center of the battery container 11 is known, but in this case, if a force that presses the negative electrode current collector rod 14 inward from the battery container 11 is applied from the outside, the end of the negative electrode current collector rod 14 becomes a separator. There is a concern that the voltage may exceed 15 and come into contact with the inner bottom surface of the battery container 11, which also serves as the positive external terminal, causing an internal short circuit.

On the other hand, according to the present invention, since an insulator is fitted to one end of the negative electrode current collector rod, even if a force is applied from the outside to press the negative electrode current collector rod inward into the battery container, the insulator protects the negative electrode from the negative electrode. Contact between the current collector rod and the battery container is prevented.

Also, since the diameter of the insulator is larger than the thickness of the laminate of the negative electrode plate and separator wrapped around the negative electrode current collector rod, the positive electrode plate is placed on the inner surface of the battery container when inserted into the center of the battery container. Only the outer circumferential surface of the insulator is in contact with the insulator, and the negative electrode plate or separator can be smoothly inserted into a predetermined position without causing any inconvenience such as peeling off from the negative electrode current collector rod.

[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 of the present invention, Figure 2 is a perspective view of the negative electrode current collector rod, and Figure 3 is a longitudinal cross-section of the battery that is the premise of the present invention. It is a diagram. 1...Battery container, 2...Positive electrode plate, 3.
...Negative electrode plate, 4...Negative electrode current collector rod, 4a.
...Insulator, 4b...Protrusion, 5...
...Separator.

Claims (1)

[Scope of utility model registration request] An insulator having a diameter larger than the thickness of the laminated body of the electrode plate and separator is fixed to one end of a current collector rod around which a unipolar electrode plate and a separator are wound, and the other polarity electrode plate is attached to the inside surface of the current collector rod. The current collector rod is inserted into the center of a bottomed cylindrical battery container arranged in a cylindrical shape, and the other end of the current collector rod is led out to the outside by passing through a sealing member that is sealed at the open end of the battery container. Cylindrical battery.