JPS6033571Y2 - battery - Google Patents

Description

[Detailed description of the invention] The present invention relates to a battery having a spiral electrode.The cylindrical current collector that also serves as the winding core of the spiral electrode is improved, and the electricity between the current collector and the spiral electrode is improved. The purpose of this invention is to ensure electrical connection with the sealing lid that seals the opening of the battery container and to prevent poor contact of the current collecting portion.

As shown in Fig. 1, a typical configuration of a battery having a spiral electrode is a power generation element in which a band-shaped negative electrode plate 1, a separator 2, a positive electrode plate 3, and a separator 2 are stacked one on top of the other in order and wound into a spiral shape. It is fitted into a frame 5 which also serves as a support for the lid 4, and is housed within a battery container 6.

The battery output is taken out from the battery container 6 through the frame 5 on the positive electrode side.
The negative electrode side is connected via the current collector 7 electrically connected to the negative electrode plate 1, or through the current collector 7 and the soft metal 8 constituting the soft part of the inner surface of the sealing lid in contact with the current collector 7. This is done through the sealing lid 4.

In order to prevent internal short circuits, a ring-shaped insulating sheet 9 is placed on top of the spiral electrode, and an insulating sheet 10 is provided at the bottom.

The opening of the battery container 6 is sealed with a sealing lid 4 via a gasket 11.

Conventionally, as a current collector for one electrode, for example, a negative electrode plate, and a winding core of a spiral electrode, a cylindrical current collector formed by rolling a rod or a band-shaped metal plate into a pipe shape has been used.

The former rod-shaped current collector was electrically connected to the negative electrode sealing lid by electric spot welding.

However, this structure poses a risk of igniting the organic solvent due to sparks during electrical spot welding, such as in organic electrolyte batteries that must be assembled in a special atmosphere to prevent moisture from entering the power generation elements. , is unsuitable.

On the other hand, as shown in Fig. 2, the method of using a cylindrical current collector, inserting the end of the negative electrode plate into the vertical gap 7a and winding it in a spiral shape is a method that There was a drawback that the electrical connection between the current collector and the electrode was uncertain due to the return of the electrode.

The present invention improves the latter cylindrical current collector, and provides interlocking uneven parts on the left and right side edges that are electrically connected to the sealing lid and face each other with a gap between them, so that the current collector and the electrodes are connected to each other. This makes the electrical connection more reliable.

Embodiments of the present invention will be described below with reference to FIGS. 3 to 6.

FIG. 3 shows a cylindrical current collector 7 formed by rolling a band-shaped metal plate into a pipe shape, in which interlocking wavy uneven portions 14 are formed on the opposing left and right side edges 12 and 13 separated by a gap 7a. be.

The end of the electrode plate is inserted into the gap 7a of the current collector 7 and wound to form a spiral electrode.

After the end of the electrode is inserted into the inside of the cylindrical current collector 7, when it is wound, the uneven portions 14 are formed as described above on the opposite side ends with a gap between them, so that there is a gap between the uneven portions. The inserted electrode plate ends intertwine with the convex portions of the concavo-convex portions to enable a good electrical connection.

Furthermore, the end portion of the electrode plate is pressurized between the concave and convex portions narrowed by the tightening force during winding, thereby making it possible to further ensure the electrical connection between the current collector and the electrode plate.

Further, even if a return force acts on the spiral electrode, the electrode end portion is entangled with the convex portion of the concave and convex portions on the other side end of the current collector, so that good electrical contact can be maintained.

FIG. 4 shows a second embodiment of the current collector, in which uneven parts are formed on the left and right side edges of the cylindrical current collector 7, which face each other with a gap in between, and on the inner surface of the sealing lid. A sawtooth-like uneven portion 1 is also provided on the end surface that contacts the soft metal 8 or the spongy metal.
5 was formed.

By forming the uneven portions 15 on the end face of the current collector 7, it is possible to strengthen the penetration into the soft metal and to more effectively transmit the current from the current collector to the sealing lid 4.

FIG. 5 shows a third embodiment in which uneven portions are formed on both left and right ends of a cylindrical current collector 7, and barbs 16 are provided on the outer surface of this cylindrical current collector.

When the electrode starts to be wound into a spiral shape, the barb-like protrusions 16 on the outer surface of the current collector sink into the electrode surface and prevent the electrode from sliding on the cylindrical current collector surface, so that the electrode and the current collector are well connected. Closely attached,
Together with the unevenness formed on the side edge that bites into the electrode, the electrical connection is made even more reliable.

FIG. 6 shows a fourth embodiment in which interlocking concavo-convex portions 14 are formed on the opposing left and right side edges of a cylindrical current collector 7, and barb-like protrusions 16 are formed on the outer surface, and further on the inner surface of the sealing lid. A sawtooth-like uneven portion 17 is formed on the end surface connected to a soft metal or a sponge-like metal.

As mentioned above, the present invention improves the shape of the current collector that also serves as the winding core, thereby making the electrical connection between the electrode and the current collector, and between the current collector and the soft metal more reliable, and improving the electrical connection of each part. It is possible to completely prevent poor contact.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a typical battery with spiral electrodes;
The figure is a perspective view showing a conventional cylindrical current collector, FIG. 3 is a perspective view of a cylindrical current collector in an embodiment of the present invention, and FIGS. 4 to 6 are a perspective view of a cylindrical current collector in another embodiment of the present invention. FIG. 3 is a perspective view of a shaped current collector. 1... Negative electrode plate, 2... Separator, 3
...Positive electrode plate, 4... Sealing lid, 6...
... Battery container, 7... Cylindrical current collector, 7a...
...Gap, 12, 13...Side ends facing each other with a gap, 14...Irregularities, 15, 17...
... Serrated uneven portion, 16... Spine-like projection.

Claims (4)

[Scope of utility model registration request] (1) A battery container, a sealing lid that seals the opening of the battery container, a cylindrical current collector that is electrically connected to the sealing lid and whose left and right side ends face each other across a gap, and inside this cylindrical current collector. and an electrode whose end part enters the gap and is spirally wound around the current collector, and the left and right side ends of the cylindrical current collector facing each other with the gap therebetween are provided with electrodes when the electrode is wound. A battery with interlocking concave and convex portions that pressurize and clamp the electrode ends, with gaps narrowed by tightening force. (2) The battery according to claim 1, wherein the cylindrical current collector has barbs on its surface. (3) The battery according to claim 1 or 2, wherein one end surface of the cylindrical current collector is provided with an uneven part that sinks into the soft part of the inner surface of the sealing lid. (4) Utility model registration claim 3, in which the soft portion into which the uneven portion of the end face of the cylindrical current collector sinks is made of a sponge-like metal.
Batteries listed in section.