JPS6035963Y2 - Separator for lead-acid batteries - Google Patents

Description

[Detailed description of the invention] When a lead-acid battery is charged, water decomposition occurs and hydrogen and oxygen gas are generated.

On the other hand, in order to prevent the anode active material from becoming fine and falling off due to charging and discharging of the lead-acid battery, it is pressurized and a glass mat is brought into contact with the anode side.

However, this is very disadvantageous from the point of view of gas release, increasing the overvoltage during charging, and reaching the gas generation potential before the electrode plates are completely charged.

During discharge, this gas acts as a resistor, leading to a drop in discharge voltage and deteriorating starting performance in the case of automotive lead-acid batteries.

Particularly in winter, the high viscosity of the electrolyte makes it difficult to remove the gas, which has a large effect on starting performance at low temperatures.

Regarding conventional separators, when a glass mat 2 is simply pasted on the entire surface of a separator 1' as shown in FIG. 1, the gas in the glass mat 2 hardly escapes.

An improved version of this, in which a glass mat 2 is attached to a corrugated separator 1'' shown in FIG. is the waveform separator 1"
It is easier to peel off.

A further critical defect is that the pressure is not applied uniformly because one side of the separator is corrugated.

In view of the above-mentioned points, the present invention is aimed at preventing insufficient charging and deterioration of starting performance due to gas accumulation by smoothly releasing gas.

An example of the present invention will be explained.

As shown in FIG. 4, a pipe 3 made of acid-resistant and oxidation-resistant synthetic resin with an outer diameter of 0.5 to 1rrrIfL1 and an inner diameter of 0.1 to 0.5 wIt is attached to the entire length and half of the separator 1. , the glass mat 2 is pasted thereon.

As a result, the gas rises inside the pipe 3, and the gas generated at the bottom of the electrode plate or near the center of the electrode plate is led out to the outside without accumulating near the electrode plate. It came out about 3 times more smoothly than the previous separator.

Furthermore, even by attaching the pipe 3, the overall thickness and length direction of the separator 4 remain unchanged from that of the conventional separator 1, so the electrical resistance of the separator 1 hardly changes, and the voltage component due to this allows for smooth gas release. This was negligible compared to the voltage increase due to the ability to perform

Figure 5 shows the low-temperature rapid discharge (-15℃ 15
A comparison of voltage characteristics during 0A discharge) is shown.

A is a battery of the present invention, and B is a conventional battery.

As is clear from FIG. 5, the battery A of the present invention has a discharge voltage (
terminal voltage) is approximately 0.1V compared to that of conventional battery B.
It can be seen that it is high and lasts a long time.

FIG. 6 also shows a comparison of charge acceptance characteristics when charging at 14.4V at 0°C.

A is a battery of the present invention, and B is a conventional battery.

As is clear from FIG. 6, the charging acceptance current (charging current) of the battery A of the present invention is larger than that of the conventional battery B.

In other words, this shows that when charging under the same conditions, battery A with better gas release can be charged faster.

In the present invention, acid-resistant and oxidation-resistant synthetic resin is used for the pipe 3, but vinyl chloride, polyethylene, polypropylene, etc. are superior in terms of price and ease of processing.

Also, the length of the pipe 3, the order in which the long pipes and short pipes are pasted together, and the number of pipes to be attached are up to you, but it is more effective to paste the short pipes near the center. For long ones, it was more effective to disperse them in the center and at the ends.

On the other hand, as an additional effect of the present invention, since the separator is reinforced by the pipe 3 and the contact area between the glass mat 2 and the separator 1 is increased, defects caused by peeling of the glass mat 2 are reduced.

As mentioned above, the present invention has great practical value, such as smooth gas release and prevention of insufficient charging due to gas accumulation and deterioration of starting performance as an automobile battery.

[Brief explanation of the drawing]

Figure 1 is a longitudinal cross-sectional view of a conventional flat separator, and Figure 2 is the same
FIG. 3 is a cross-sectional view of a conventional separator with one side corrugated; FIG. 3 is a cross-sectional view of the separator according to the present invention; FIG. 4 is a front view of the separator; FIG. FIG. 6 is a comparison diagram of the charging acceptance characteristics. 1 is a separator, 2 is a glass mat, 3 is a pipe, and 4 is a separator.

Claims (1)

[Scope of utility model registration request] A lead-acid battery separator comprising long and short pipes made of acid-resistant and oxidation-resistant synthetic resin, which are laminated as appropriate in the longitudinal direction of a separator, and a glass mat is adhered to the laminated portion.