JPH0286057A - Electrolyte pouring method for reserve battery - Google Patents

Abstract

PURPOSE:To surely pour such an amount of electrolyte that a leak current circuit is not produced between unit cells by controlling the degree of vacuum within a battery container. CONSTITUTION:When a battery is used, the battery or a battery mounted unit is put into water, then an arming wire 9 is drawn out. A piston 7 is moved to a position 7' with a spring 10. Outside water or sea water is sucked by reduced pressure within the battery, and dissolves chemicals such as powdery potassium hydroxide. The dissolved chemical solution is poured into each unit cell 1 though a liquid guide pipe 4, a branch pipe 3, and pouring holes 2 to generate electric power. If the pressure of the battery is completely reduced, all spaces within the battery are filled with the electrolyte and may cause self discharge or a spark. By slightly reducing the degree of vacuum within the battery, a space is produced in the upper parts of unit cells after the filling of electrolyte was finished. This prevents the battery from generating a leak current circuit.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a liquid injection type battery.

Conventional technology A liquid injection type battery is one that is assembled and stored in an unfilled state, and when used, electrolyte is injected by remote control etc. to operate it as a battery.
Often used in zinc batteries, etc.

The electrolyte can be prepared by placing a pre-adjusted electrolyte in a container, or by adding only a chemical (potassium hydroxide, etc.) that will become the electrolyte and introducing seawater etc. to dissolve it. There are ways to inject this.

Methods for filling a liquid injection type battery include: (1) A method in which a gas generator is added and the electrolyte is pressurized using the combustion gas pressure generated by igniting the gas generator during use.

(2) A method of creating a vacuum inside the battery, breaking the seal before use, and using the vacuum to suck out the electrolyte.

There is.

Problems to be Solved by the Invention Although the method using a gas generator is used in -a,
It has the disadvantage that the structure is complicated, and the electrolyte does not penetrate well into the electrode plate group, so that the electrode plates do not work satisfactorily.

On the other hand, with methods that use vacuum, if the degree of vacuum is too high, the amount of electrolyte injected is too large, and the electrolyte becomes common between each unit cell, resulting in a leakage current circuit.Also, when storing batteries for a long time, In some cases, some of the electrode plates decompose and generate gas, or it is difficult to maintain a complete seal, making it difficult to maintain a vacuum state and reducing the degree of vacuum, making it difficult to inject sufficient electrolyte. This results in the inability to fully utilize the electrode plate.

Means for Solving the Problems The present invention is a method for pouring liquid into a liquid-filling type battery, in which an amount of electrolyte is injected to the extent that a common electrolyte is not generated between each unit cell by adjusting the degree of vacuum within the battery container. It is characterized by being liquid.

Function The present invention makes it possible to inject an amount of electrolyte that does not create a common electrolyte between each unit cell in the battery container by adjusting the degree of vacuum inside the battery container to a predetermined value when pouring liquid. It can be made to liquefy.

For example, it is possible to inject at least 1/2 or more of the internal space of the unit cell, and to secure a space at least equal to or larger than the volume of the branch pipe.

For this purpose, the inside of the battery is kept at normal pressure (vacuum is also acceptable) when the battery is shipped, and the inside of the battery is brought to a predetermined degree of vacuum using a vacuum pump or the like before mounting the battery on a device or prior to use. Furthermore, the degree of vacuum is checked periodically while mounted on the equipment, and additional measures are taken to maintain a predetermined degree of vacuum.

Example A preferred embodiment of the invention is shown in FIG.

Reference numeral 1 denotes a unit cell consisting of a group of electrode plates (not shown), such as a silver-zinc oxide battery, assembled in an unfilled state, and a plurality of units are connected in parallel or in series. An injection hole 2 into which an electrolytic solution is injected is arranged in the upper part of each unit cell, and above the injection hole 2 there is a branch pipe 3 which is a passage through which the electrolytic solution flows. 4 is a liquid guide pipe, 5 is a chemical such as granular potassium hydroxide, 6 is an electrolyte dissolving chamber, and 7 is a piston that isolates the inside and outside of the battery, and is kept airtight by an O-ring 8. It's dripping. 9 is an arming wire, and the piston is moved to 7 by the spring 10.
It prevents it from moving to °. Reference numeral 11 denotes an adapter, which is connected to an external vacuum pump (not shown) for evacuating the inside of the battery before it is mounted on a device or used. 12 is a cook.

When the battery is mounted on a device or stored for a long period while mounted on the device, the adapter 11 is connected to an external vacuum pump periodically or before use for a certain period of time to create a vacuum inside the battery.

When in use, place the battery or battery-equipped device in water, pull out the arming wire 9, and the piston 7
is moved to the 7° position by the spring 10. External water or seawater is drawn into the electrolyte dissolution chamber 6 by the vacuum action inside the battery, dissolves chemicals such as granular potassium hydroxide, and flows into the liquid guide pipe 41 branch pipe 3. Each unit cell 1 through injection hole 2
is injected into the interior, thus generating electrical power.

When the inside of the battery is brought to a value close to a complete vacuum (0111180), the entire space inside the battery is filled with electrolyte.

In this state, there is a leak of 1 in the injection hole-branch pipe-injection hole path between each unit cell! This creates a current circuit, causing self-discharge and sparks.

Therefore, by slightly lowering the degree of vacuum inside the battery container instead of creating a complete vacuum, it is possible to create a space above the top of the unit cell inside the battery (above the dotted line in the figure) after the liquid injection is completed, which allows leakage current. It is possible to prevent a circuit from occurring.

For example, the degree of vacuum in the container to inject at least 172 parts of the internal space of the unit cell and to ensure a space at least equal to or greater than the volume of the branch pipe can be determined as follows.

The volume of the entire unit cell part is V, (cc), the volume of the branch pipe part is Vt (cc), the volume of the electrolyte dissolution chamber is V, (cc)
, the internal pressure of the container before liquid injection is P, (111189), the gas amount converted to normal pressure in the volume part before liquid injection is v, respectively.
x (Px /760), Vt x (Px /
760).

V s X (P x / 76 (1) becomes.

The internal pressure PXI to fill the unit cell volume of 172 or more is (V, +
Vt +Vs) PXI <Vl x760
x (1/2) Also, the internal pressure px2 to prevent at least the branch pipe from being filled is (Vl +V2+Vs) P x2> Vt X76
0, so for example, V r = 12000, V
x = 300.

If V, = 3000, then P Xl < +1/2)
2000/(12000+300+3GOO)), °,
P, (298 (mmHg) P x2> 760x (300/(12000
+300+3000)),', P X2> 15(i
nllg), and the internal pressure Px is 15 mmHg or more291
A value of 11 nIIHg or less is suitable.

In other words, when expressing the degree of vacuum PvA″I′, (760-2
98><PvA<(760-15)462
It becomes PvA 745.

Effects of the Invention As described above, the present invention makes it possible to reliably inject an appropriate amount of electrolyte with a simple structure.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a liquid injection type battery to which the present invention is applied. 1...Battery, 2...Injection hole 3...Branch pipe, 11...Adapter

Claims (1)

[Claims] A method for filling a liquid injection type battery, which is characterized by injecting an amount of electrolyte that does not create a common electrolyte between each unit cell by adjusting the degree of vacuum within the battery container. How to fill batteries.