JPS5996650A - Injection method into cylindrical battery - Google Patents

Abstract

PURPOSE:To shorten the liquid suction time and perform stable injection by inserting a tapered tip section of an injecting hopper into the center space section of a spiral pole plate group inserted into a case and injecting a predetermined quantity of an electrolyte after pressing the periphery of the tip section to the pole plate group. CONSTITUTION:After a spirally-wound pole plate group 1 is inserted into battery case 2, the case 2 is grooved, then an electrolyte is injected. In this case, a tapered tip section 10 forming the nozzle of an injecting hopper 9 is inserted into the center space section 7 of the pole plate group 1, and after the periphery of the tip section is pressed to the upper center of the pole plate group, a predetermined quantity of an electrolyte 11 is injected into the injecting hopper 9. The injection work of the electrolyte 11 injected into the hopper 9 progresses from the center space section of the pole plate group, the electrolyte infiltrates upward from the battery case bottom, and the injection work is completed. Accordingly, the suction time of the electrolyte is shortened, and in addition, stable injection can be performed with no liquid reservoir generated on the upper side of the pole plate group.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for filling cylindrical batteries, for example cylindrical nickel-cadmium storage batteries.

Conventional Structure and Problems The cylindrical nickel-cadmium storage battery has a cylindrical plate group 1 in which a nickel positive electrode and a cadmium negative electrode are spirally wound with a separator interposed between them, as shown in Fig. 1. After inserting it into the battery case 2 and injecting electrolyte into this electrode plate group 1,
The battery was constructed by positioning the sealing plate 3 on the grooved part 4 of the case 2 via the insulating gasket 6, and caulking the open upper end of the case 2 inward. In the figure, reference numeral 6 denotes a negative electrode lead piece, which is spot-welded to the inner bottom of the case 2 by inserting a rod-shaped welding electrode from the central space 7 of the electrode plate group 1 before injecting liquid. Further, a positive electrode lead piece 8 is welded to the end of the positive electrode plate at the upper part of the electrode plate group in advance, and is welded to the sealing plate 3 after the liquid injection is completed.

In this series of battery assembly processes, in the injection process of injecting a predetermined amount of electrolyte into the electrode plate group inserted into the battery case 72, it is necessary to prevent variations in battery characteristics, mainly battery internal resistance, due to variations in the amount of liquid. .

Furthermore, as shown in FIG. 1, a pool of electrolyte occurs above the grooved part 4 of the battery case 2 due to poor liquid absorption in the electrode plate group 1 during injection, and when the case is sealed with the sealing plate 3. In some cases, it may not be possible to prevent the liquid from flowing out of the case, so a liquid injection method is adopted in which the electrolyte does not come into contact with the upper side of the grooved part of the case. Therefore, in conventional liquid injection methods, it is customary to inject the electrolyte from two sides of the spirally wound electrode plate group; Because the entire area is filled with electrolyte, the air inside the case cannot be replaced with the electrolyte, and it takes a long time for the electrolyte to completely penetrate into the case, making it unsatisfactory in terms of productivity. There wasn't.

Purpose of the Invention The present invention eliminates the drawbacks of the conventional liquid injection method, and allows a large amount of liquid to be absorbed into the electrode plate group in a short period of time without causing an armpit gap on the upper side of the electrode plate group. The purpose is to provide a liquid injection method suitable for production.

Structure of the Invention That is, in order to achieve the above object, the present invention inserts a tapered tip of a liquid injection hopper into a medium space of a spiral electrode plate group inserted into a cylindrical battery case. , after the peripheral surface of the tip is pressed against the electrode plate group, a predetermined amount of electrolyte is injected.

According to the liquid injection method of the present invention, the electrolytic solution is supplied from the lower part of the electrode plate group, and the air and liquid are quickly replaced in the battery case, without forming a pool of liquid on the upper side of the electrode plate group. Rapid liquid absorption into the electrode plate group can be achieved.

DESCRIPTION OF EMBODIMENTS Below, the liquid injection method of the present invention will be explained by way of embodiments.

FIG. 2 shows a schematic diagram of the configuration when pouring electrolyte. After pushing the spirally wound electrode plate group 1 into the battery case 2, the battery cake is subjected to full moon 4, and then Inject electrolyte. In this case, the tapered tip 10 forming the nostle of the liquid injection hopper 9 is inserted into the medium heat space 7 of the coiled electrode group 1, and the peripheral surface of the tip is After pressing the two central parts of the electrolyte 11 into the liquid injection hopper 3, a predetermined amount of the electrolytic solution 11 is injected into the liquid injection hopper 3. The electrolyte 11 injected into the hopper 3 is poured into the central space of the electrode plate group.
The electrolyte penetrates into the bottom of the battery case in both directions, completing the Note 1 work.

In this case, the air inside the battery case is pushed upward by the electrolyte that permeates from the bottom of the battery case, so that the air inside the battery case and the electrolyte are smoothly replaced.

Effects of the Invention The liquid injection method of the present invention shortens the electrolyte absorption time, and also enables stable liquid injection with no liquid pooling above the electrode group, thereby increasing battery productivity. 0 which significantly improves

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of the structure of a cylindrical nickel-cadmium storage battery, and FIG. 2 is a schematic diagram of the structure at the time of electrolyte injection, showing an example of the injection method of the present invention. 1... Electrode plate group, 2... Battery case, 9
...... Hopper for liquid injection, 10... Tapered tip, 11... Electrolysis g! . Name of agent: Patent attorney Toshio Nakatashi and one other person Figure 1
3 Figure 2

Claims (1)

[Claims] The tapered tip of the liquid injection hopper is inserted into the central space of the spiral electrode group inserted into the cylindrical battery case, and after pressing the circumferential surface of the tip against the electrode group, a predetermined amount of How to inject electrolyte into a cylindrical battery.