JPH0120772Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a non-aqueous electrolyte battery, particularly one having a structure in which a cylindrical negative electrode made of a light metal such as lithium is inserted axially into the center of a cylindrical battery case.

Generally, cylindrical non-aqueous electrolyte batteries are shown in Figures A and B.
As shown in FIG. 1, an example thereof is constructed using a cylindrical negative electrode 14 made of a light metal such as lithium. The non-aqueous electrolyte battery 10 shown in the figure is of a so-called cylindrical inside-out type, and has a terminal 26.
A negative electrode 14 and a separator 16 are placed in a cylindrical battery case 12 sealed with a gasket 28.
A power generation element 20 having positive electrodes 18 arranged coaxially is loaded together with a non-aqueous electrolyte 22. Here, the negative electrode 14, the separator 16 and the positive electrode 18
are each formed into a cylindrical shape, and a negative electrode 14, a separator 16, and a positive electrode 18 are arranged coaxially with each other in order from the center of the battery case 12. In the case of the battery 10 shown in the figure, a negative electrode current collector 24 is inserted into the inner cavity of the cylindrical negative electrode 14, and this current collector 24 is further connected to a negative electrode terminal 26. Further, the positive electrode 18 is in direct contact with the inner wall surface of the battery case 10, so that the battery case 12 also serves as a positive electrode terminal.

By the way, as an example of the negative electrode 14 is shown in FIG. 2, the negative electrode 14 is made of a light metal such as metallic lithium and formed into a cylindrical shape with both ends open. It is constructed by winding it into a cylindrical shape. When the above-described cylindrical inside-out type non-aqueous electrolyte battery 10 is constructed using such a cylindrical negative electrode 14, the non-aqueous electrolyte 22 filled in the battery case 12 is used as the cylindrical negative electrode 14. The electrolyte also enters the inner cavity, that is, the hollow part 14a, and a considerable amount of the electrolytic solution accumulates in that part. After the non-aqueous electrolyte 22 is injected into the battery case 12, the non-aqueous electrolyte 22 is first poured into the hollow part 14a.
From there, it penetrates into the separator 16 on the outside of the cylindrical negative electrode 14, and only then does it function as a battery. However, in the conventional cylindrical inside-out type non-aqueous electrolyte battery 10 as described above, the non-aqueous electrolyte 22 once injected into the battery case 12 flows through the cylindrical wall of the cylindrical negative electrode 14 to the separator 16 side. As a result, it takes a long time for the injected electrolyte to sufficiently penetrate the separator 16, and the path through which the injected non-aqueous electrolyte 22 moves to the outside of the cylindrical negative electrode 14 is There are only two locations, an upper end and a lower end, of the cylindrical negative electrode 14, and therefore, it takes time for the electrolytic solution 22 to permeate, and the air inside the electrolytic solution 22 cannot be sufficiently discharged when the electrolytic solution 22 is injected. For this reason, in this type of conventional non-aqueous electrolyte battery 10, it first takes a long time for the electrolyte to spread sufficiently and the performance of the battery becomes stable, and furthermore, the electrolyte in the battery case 12 is Due to insufficient movement of the battery, its performance as a battery tends to deteriorate.
Furthermore, air was likely to be trapped within the power generation element 20, which further adversely affected the discharge performance.

This idea was made in view of the above-mentioned conventional problems, and its purpose is to improve the basic structure of conventional non-aqueous electrolyte batteries of this type without changing them. By simply implementing an extremely simple additional configuration, the injected electrolyte can quickly and sufficiently penetrate into the separator, etc., thereby significantly shortening the period from when the electrolyte is injected until the discharge performance stabilizes. This significantly improves overall performance by increasing the freedom of electrolyte movement within the battery case and preventing air from becoming trapped within the power generation element. An object of the present invention is to provide such a non-aqueous electrolyte battery.

In order to achieve the above object, this invention provides a non-aqueous electrolyte battery having a battery can 12, a negative electrode 14, a separator 16, and a positive electrode 18, wherein the negative electrode 14 has the separator 16 on its outer periphery. and the positive electrode 18 are arranged and inserted in the axial direction of the center of the battery can 12, the negative electrode 14 is formed in a cylindrical shape and has a large number of small holes 30, and the small holes 30 are It is characterized by penetrating the negative electrode 14 in the radial direction.

Hereinafter, preferred embodiments of this invention will be described based on the drawings.

First, FIG. 3 shows an embodiment of a cylindrical negative electrode 14 used in a non-aqueous electrolyte battery according to this invention. The cylindrical negative electrode 14 shown in the figure is made of a light metal, for example, metallic lithium, and its outer shape is the same as that of the conventional one described above. The method for forming it is the same as conventional ones, by winding a sheet of lithium into a cylinder. However, the cylindrical negative electrode 14 used in this invention is
As shown in the figure, a large number of small holes 30, 30, . . . are provided that penetrate the cylindrical wall portion in the radial direction.
The large number of small holes 30, 30, ... are formed in the cylindrical negative electrode 1.
4 can be easily formed by providing a large number of through-holes in advance in the sheet-like lithium.

4A and 4B each show a cylindrical inside-out type non-aqueous electrolyte battery 10 constructed using a cylindrical negative electrode 14 having the structure shown in FIG. 3, respectively. The non-aqueous electrolyte battery 10 shown in the figure has the same basic configuration as the conventional one described above, and has a negative electrode 14, a negative electrode 14, Power generation element 2 formed by coaxially arranging separator 16 and positive electrode 18
4 is filled together with a non-aqueous electrolyte 22. The negative electrode 14, the separator 16, and the positive electrode 18 are each formed into a cylindrical shape, and the negative electrode 14, the separator 16, and the positive electrode 18 are arranged coaxially with each other in order from the center of the battery case 12. A negative electrode current collector 24 is inserted into the inner cavity of the cylindrical negative electrode 14, and further, this current collector 24 is connected to a negative electrode terminal 26. Further, the positive electrode 18 is in direct contact with the inner wall surface of the battery case 10, so that the battery case 12 also serves as a positive electrode terminal.

Here, as partially enlarged and shown in FIGS. 4A and 4B, the cylindrical wall of the cylindrical negative electrode 14 inserted into the battery case 10 has a large number of small holes 30, 30 penetrating in the radial direction. 30... are provided, so that the non-aqueous electrolyte 22 injected into the battery case 10 passes from the hollow part 14a of the cylindrical negative electrode 14 through the large number of small holes 30, 30,... It can be easily moved to the outside of the cylindrical negative electrode 14. Therefore, after the electrolytic solution 22 is injected, the electrolytic solution 22 penetrates into the separator 16 much faster than before, and the discharge performance can be stabilized within a short time after the electrolytic solution 22 is injected. You will be able to do so. In addition, the large number of small holes 3
Since the electrolyte 22 can freely pass through 0, 30, ..., the electrolyte 22 is evenly distributed within the battery system, and the electrolyte 22 within the battery system is
2 is not biased, and as a result, the discharge performance can be significantly improved and stabilized compared to the conventional method. Furthermore, the air within the power generating element 20 is not trapped within the power generating element 20, but can be easily discharged to the outside through the numerous small holes 30, 30, . . . , thereby improving overall performance. will be guaranteed.

As described above, the non-aqueous electrolyte battery according to this invention can improve its discharge performance after injecting electrolyte by adding an extremely simple additional configuration without forcing almost any changes to its basic configuration. can significantly shorten the time it takes for the
Furthermore, the degree of freedom of movement of the electrolyte is increased and the air within the power generation element is reliably discharged, making it possible to significantly improve the general performance of the battery.

[Brief explanation of the drawing]

Figures 1A and B are cross-sectional views showing examples of conventional non-aqueous electrolyte batteries, Figure 2 is a perspective view of a cylindrical negative electrode used in conventional non-aqueous electrolyte batteries, and Figure 3
The figure is a perspective view showing an example of a cylindrical negative electrode used in a non-aqueous electrolyte battery according to this invention, and Figures 4A and B
2A and 2B are cross-sectional views showing examples of the cylindrical non-aqueous electrolyte battery according to this invention. In each figure, common or corresponding parts are indicated by the same reference numerals. 10...Battery, 12...Battery case, 14...
Negative electrode, 14a... hollow part, 16... separator,
18... Positive electrode, 20... Power generation element, 22... Nonaqueous electrolyte, 24... Current collector, 26... Terminal, 28...
...Gasket, 30...Small hole.

Claims (1)

[Claims for Utility Model Registration] Battery can 12, negative electrode 14, and separator 16
and a positive electrode 18, the negative electrode 14 is inserted in the axial direction of the center of the battery can 12 with the separator 16 and the positive electrode 18 disposed on the outer periphery, A nonaqueous electrolyte battery characterized in that the negative electrode 14 is formed in a cylindrical shape and has a large number of small holes 30, and the small holes 30 penetrate the negative electrode 14 in a radial direction.