JPH04206338A - Organic electrolytic battery - Google Patents

Abstract

PURPOSE:To improve the discharge characteristic and leak resisting characteristic by providing a notch part on the outer circumference of the upper flat part of a battery inner case with a reversed hat-like section. CONSTITUTION:One notch part 8 is formed on the outer circumferential part of the upper flat part of a stainless steel battery inner case 7 with a reversed hat-like section, and holes 9 are provided on the side surface of the case. Thus, the gap between the inner surface of a stainless steel battery case 2 used also as a positive electrode terminal and the outer circumferential part of the upper flat part of the battery inner case 7 with the reversed hat-like section welded to the battery case 2 is never perfectly clogged by a sealing agent fallen from the inner side surface of the battery case 2 in the sealing agent applying process, and as the upper part from the height of the holes 9 provided on the side surface of the battery inner case 7 with the reversed hat-like section is also filled with an electrolyte in the battery assembling process, a discharge abnormality can be effectively suppressed. Thus, the leak resisting characteristic is not changed, and the dispersion of discharge and the rise and dispersion of internal resistant at discharge end period can be eliminated.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to an organic electrolyte battery.

(Prior Art) A typical example of a conventional organic electrolyte battery will be described with reference to FIG.

As shown in FIG. 5, a positive electrode 4 made of manganese dioxide or the like as an active material, a separator 6 made of polypropylene or the like, and lithium 5 as a negative electrode active material are sequentially placed in a battery case 2 that also serves as a positive electrode terminal. A sealing plate 1 which also serves as a negative electrode terminal is placed on top, a gasket 3 made of polypropylene is placed around the sealing plate 1, and the battery case 2 is pressurized inward and folded to form a sealed structure.

(Problems to be Solved by the Invention) By the way, in view of the battery configuration as described above, the following two types of batteries can be considered. That is, (1) a battery in which the folded part (a) of the sealing plate 1 has a longer dimension (see FIG. 6); (2) a battery in which the shape of the entrance part (b) of the sealing plate 1 is changed (
(See Figure 7) However, both of these two types of batteries have a sealing plate,
There was a problem in that the volume occupied by the three parts, the battery case and the gasket, increased, and the rate of increase in the internal volume of the battery was small compared to the rate at which the outer diameter and height of the battery increased.

Therefore, a battery using a case inside the battery has been proposed. Such batteries have a structure as shown in Figure 1, and the internal volume of the battery is increased or has a completely new structure, so
A discharge abnormality occurs due to insufficient electrolyte as shown in discharge curve B in FIG. 3. The cause of this is that the gap between the inner surface of the battery case 2 and the outer periphery of the upper flat part of the inner case 7 of the battery case 7, which is welded to the battery case 2, This is thought to be due to the sealing agent flowing down during the coating process above the flat upper part of the inner case 7, causing the sealant to become blocked.

For this reason, during the battery assembly process, when the electrolyte is injected into the battery case and the mixture is inserted, air can escape up to the height of the hole made on the side of the battery inner case, which has a reverse knot-shaped cross section. It is conceivable that it will be filled with electrolyte, or that the area above the height of the hole provided on the side surface will be airtight, and gas-liquid replacement will not occur, remaining as an air pocket, resulting in a shortage of electrolyte.

The present invention has been made in view of the above circumstances, and is designed to prevent air from remaining inside the battery case even when the electrolyte is injected into the battery case and the mixture is inserted, thereby improving discharge characteristics and leakage resistance. The purpose of this invention is to provide an organic electrolyte battery with good quality.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention provides a power generation element consisting of a positive electrode molded into pellets, a negative electrode made of a light metal, an organic electrolyte, and a separator, and and a battery case, a casket interposed between the two, and an organic electrolyte battery sealed by an inner battery case having an inverted hat-shaped cross section, with its upper flat part touching the bottom of the force sket and its lower flat part contacting the battery case. The present invention is characterized in that at least one notch is provided on the outer periphery of the upper flat part of the battery inner case having an inverted hat shape in cross section.

(Function) According to the organic electrolyte battery of the present invention, the gap between the inner surface of the battery case and the outer periphery of the upper flat part of the battery inner case, which has an inverted hat-shaped cross section and is welded to the battery case, is In this case, the battery case is not completely blocked by the sealant that has flowed down from the inner surface of the battery case.

Therefore, in the battery assembly process, the upper part of the hole provided on the side surface of the battery inner case having an inverted/X-shaped cross section is filled with the electrolytic solution, so that abnormal discharge can be effectively suppressed.

(Example) An example of the present invention will be described using a lithium manganese dioxide battery having a diameter of 24 squares and a height of 7.7 cm.

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention.

In the figure, 1 is a sealing plate made of stainless steel that also serves as a negative electrode terminal, 2 is a battery case made of stainless steel that also serves as a positive terminal, 3 is a gasket made of polypropylene, and 4 is made of manganese dioxide, a conductive material, and a binder. The diameter of the positive electrode mixture is 20
This is a positive electrode pellet molded into a pellet with a height of 5 mm. 5 is lithium which is a negative electrode active material, 6 is a separator made of polypropylene, and 7 is a battery inner case made of stainless steel and having a reverse knot-shaped cross section with a notch provided on the outer periphery of the flat upper part. The electrolytic solution used was one in which lithium perchlorate was dissolved in an equal volume mixed solvent of propylene carbonate and 1.2 dimethoxyethane.

FIG. 2 is a perspective view of the battery inner case having a reverse notch-like cross section as shown in FIG. There are 9.

Next, the maximum and minimum values of the discharge curves when 100 batteries each were continuously discharged at 4 and 7 Ω, with the battery of this example as A and the conventional battery as B, are shown in Figure 3. Indicated. Moreover, the distribution of internal resistance (1 kHz AC method) at the time of 80% depth of discharge is shown in FIG.

As can be seen from the discharge curve in Fig. 3, there is a large variation in conventional battery B, and the internal resistance at 80% depth of discharge (1,k H
It can be seen from the distribution of z AC method) that in conventional battery B, the increase in internal resistance is large and the variation is also large.

In addition, in order to compare the leakage resistance of the present example battery A and the conventional example battery B, 50 of each of the batteries were manufactured, and 70°
C for 1 hour, then lowered the temperature to -10°C for 1 hour.

When a temperature cycle experiment was conducted for 20 days in which the temperature was raised to -10°C for 1 hour and the temperature was raised to 70°C for 1 hour, the leakage rate was O for both batteries. From this result, it was found that even if the notch 8 was provided on the outer periphery of the upper flat part of the battery inner case, the leakage resistance characteristics did not change.

[Effects of the Invention] As explained above, the organic electrolyte battery of the present invention has the excellent effect of changing the leakage resistance characteristics and eliminating variations in discharge, increase in internal resistance at the end of discharge, and variations. play.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of an embodiment of the present invention, FIG. 2 is a perspective view of the battery case shown in FIG. 1, and FIG. 3 is a diagram comparing the discharge curves of the battery of this embodiment and conventional battery B. , Fig. 4 is a distribution diagram comparing the internal resistance at 80% depth of discharge between battery A of this example and conventional battery B, and Figs. 5 to 7 are cross-sectional views of conventional organic electrolyte batteries. be. ]...Sealing plate 2...Battery case 3...Cascellato 4...Positive electrode 5...Negative electrode 6...Separator 7...Battery inner case 8...Notch 9...Hole (11733 ) Agent Patent attorney Yoshiaki Inomata (and 1 other person) Figure 1 Figure 2 Figure V (neckline (h) Figure 3 Figure 4

Claims (1)

[Claims] A power generation element consisting of a positive electrode molded into a pellet, a negative electrode made of a light metal, an organic electrolyte, and a separator is connected to a sealing plate, a battery case, a gasket interposed between the two, and the upper flat part of the bottom of the gasket is connected to the battery case. an organic electrolyte battery sealed by an inner battery case having an inverted hat-shaped cross section, the lower flat part of which is in contact with the battery, the battery inner case having an inverted hat-shaped cross section having at least one notch on the outer periphery of the upper flat part; An organic electrolyte battery characterized by being provided with.