JPH0578139B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an electrolyte injection method for lead-acid batteries.

Structure of conventional examples and their problems In recent years, small lead-acid batteries have been required to be smaller and larger in capacity (same shape), and in response to this, the ratio of electrode plates and active materials in the battery case has increased.
There is almost no space left for the electrolyte.

Since the electrolytic solution is designed to be soaked into the separators and electrode plates, it has conventionally taken 60 to 120 seconds to complete the injection, as shown in Figure 1. When this liquid was forced to be injected to save time, it overflowed from the liquid opening, making it impossible to inject the correct amount of liquid. Therefore, for example, it took about 120 seconds to inject 80 ^CC , and the electrolyte still overflowed.
A method of injecting sulfuric acid while creating a vacuum inside the battery has also been devised, but from the time sulfuric acid is injected, a chemical reaction begins between the electrode plates and the electrolyte, producing gas. Therefore, even in a vacuum state, due to the gassing phenomenon, the pressure reached the same level as atmospheric pressure in a shorter time than in a vacuum state, and the effect of the vacuum was lost, so that it could not be put to practical use. Furthermore, as a phenomenon occurring in a vacuum, as soon as sulfuric acid was added, violent gassing began and the internal pressure increased, causing the electrolyte to spray out from the injection port, making it impossible to inject an accurate amount.

Purpose of the Invention The present invention solves the above-mentioned conventional problems, and aims to significantly shorten the electrolyte injection time for lead-acid batteries and to ensure that a specified amount can be supplied. .

Structure of the Invention In the electrolyte injection method for a lead-acid battery of the present invention, an electrolyte supply part having an injection valve and a vacuum switching part having a vacuum switching valve are fixed to an injection jig having an electrolyte receiving part and a nozzle. The electrolytic solution is injected by bringing the nozzle of the liquid injection jig into close contact with the liquid injection port of the lead-acid battery and operating the liquid injection valve and vacuum switching valve.

With this configuration, the electrolyte injection time of the lead-acid battery can be significantly shortened.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 2 to 7 are cross-sectional views showing the process of the liquid injection method of the present invention. In Figures 2 to 7, 1
2 is a lead-acid battery, 2 is its electrode plate group, 3 is a battery case, and 4 is a liquid inlet.

5 is a liquid injection jig having a nozzle 6, an electrolyte receiving part 8, and a space 9, and is connected to the liquid injection port of the storage battery 1 through a seal packing 7 made of acid-resistant neoprene rubber fixed to the base of the nozzle 6. It's in close contact. Reference numeral 10 denotes a vacuum switching unit consisting of a vacuum pump 11, a vacuum switching valve 12 having an air suction port 13, and an air supply duct 14, and is fixed to the upper side of the liquid injection jig 5. Reference numeral 15 denotes an electrolyte supply section consisting of a funnel 17 for holding a quantitatively measured electrolyte 16, a pipe 18, and a liquid injection valve 19.
is inserted into the space 9 and fixed by adhesive. Note that the tip of the pipe 18 is regulated in position so that it is located below the air supply duct 14.

Next, a method of injecting the electrolyte will be explained. First, the inside of the lead-acid battery 1 and the inside of the space 9 of the liquid injection jig 5 are opened by opening the vacuum switching valve 12 as shown in FIG.
The vacuum is maintained at 700mmHg. Next, when the liquid injection valve 19 is opened by the solenoid valve, the electrolyte 16 in the funnel 17
The injection jig 5 is passed through the pipe 18 as shown in FIG.
The electrolyte is injected into the electrolyte receiving portion 8 of the electrolyte. At this time, the vacuum switching valve 12 is closed.

Next, when the liquid injection valve 19 is closed, the electrolyte receiving part 8
The injected electrolyte 16 is injected into the lead-acid battery 1 as shown in FIG. 4, but not all of the electrolyte 16 is injected and a portion remains in the electrolyte receiver 8. Next, as shown in FIG. 5, the air in the space 9 is removed by the vacuum pump 11, the vacuum switching valve 12 is opened, and atmospheric pressure is introduced from the air suction port 13 as shown in FIG. As a result, the electrolyte 16 remaining in the electrolyte receiver 8 is pushed from above by the atmospheric pressure that has entered the space 9, and is pushed into the lead-acid battery 1 as shown in FIG. 7, completing the injection. do.

Incidentally, in the case of a lead-acid battery using a liquid-absorbing separator, it is preferable to repeat the operations shown in FIGS. 6 and 7 above. FIG. 8 shows a time chart of liquid injection according to this embodiment.

Effects of the Invention In the present invention, as is clear from FIG. 8, the liquid injection time can be significantly shortened compared to the conventional method, and there is no overflow of liquid, so that accurate liquid injection can be achieved.

[Brief explanation of the drawing]

Figure 1 is a time chart of liquid injection according to the conventional example.
Figure 2 is a sectional view showing the vacuum state before injection of electrolyte in a lead-acid battery according to an embodiment of the present invention;
The figure is a sectional view showing the injection state during the same injection, and Figure 4 is a sectional view showing the state where the liquid is overflowing after injection.
FIG. 5 is a sectional view showing the same vacuum state, FIG. 6 is a sectional view showing the state where the vacuum is switched to atmospheric pressure, and FIG. 7 is a sectional view showing the state where liquid injection is completely completed.
FIG. 8 is a diagram showing a time chart of liquid injection according to an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Lead-acid battery, 5... Liquid injection jig, 6... Nozzle, 8... Electrolyte receiving part, 10... Vacuum switching part, 1
1...Vacuum pump, 12...Vacuum switching valve, 1
3... Air suction port, 16... Electrolyte supply section, 17
... funnel, 18 ... pipe, 19 ... liquid injection valve.

Claims (1)

[Claims] 1 Fix an electrolyte supply part with a liquid injection valve and a vacuum switching part with a vacuum switching valve to a liquid injection jig having an electrolyte receiving part and a nozzle, and use the nozzle of the liquid injection jig to inject liquid into a lead-acid battery. Close the injection valve with the electrolyte in close contact with the mouth, and after the electrolyte has been injected into the electrolyte receiver, close the injection valve. Next, remove the air with a vacuum pump, open the vacuum switching valve, and remove the liquid from the air intake port. 1. A method for pouring electrolyte into a lead-acid battery, which comprises introducing atmospheric pressure and forcing the electrolyte in the electrolyte receiving part into the battery by the atmospheric pressure.