JPH03216956A - Storage battery with electrolyte stirring device - Google Patents

Abstract

PURPOSE:To suppress the charge quantity to the minimum required and resolve the concentration difference of an electrolyte by fitting a liquid stirring device stirring a liquid with the gas generated by a battery. CONSTITUTION:An electrolyte stirring device D is opened on the bottom section of a battery jar A at the lower end and opened near the lowest level of an electrolyte C at the upper end, a liquid circulating tube 1 with a small hole 4 is arranged at the middle section, a lower end opening section is arranged below the small hole 4, a gas collecting chamber 2 collecting the gas generated from an electrode plate group B is provided, and the gas collecting chamber 2 and the small hole 4 of the liquid circulating tube 1 are communicated by a reverse-U-shaped siphon strap 3. The upper end opening section of the liquid circulating tube 1 is covered by a cap opened on the lower face, or the upper end section of the liquid circulating tube 1 is folded into a reverse-J-shape to form a gas reservoir 5. The liquid is stirred by utilizing the gas generated by the electrode plate group B when a storage battery is charged. The charge can be completed with the overcharge quantity about half of the conventional ones, and the concentration difference of the electrolyte C can be resolved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Application of Industry-F The present invention relates to a storage battery for cycle service such as Baddeley forklifts and electric vehicles, which is equipped with an electrolyte stirring device.

Conventional technology and its challenges For storage batteries, the electrolyte is a substance involved in direct reactions, so just like the active material of the electrode plates, the capacity of the storage battery can be greatly influenced by how effectively the electrolyte is used within the battery. As is well known, it depends on

However, in the case of a button storage battery, the specific gravity of the electrolytic solution in the upper part of the storage battery becomes low during charging and discharging, and the electrolytic solution with high specific gravity always remains in the lower part of the storage battery.

In order to eliminate this concentration difference between the electrolytes, overcharging is applied to generate scum, and the stirring action of this scum is used to equalize the specific gravity of the upper and lower electrolytes. In this case, if the storage battery shape is vertically low, it is relatively easy to equalize the specific gravity of the electrolyte by stirring the gas generated by overcharging.
It is a common knowledge that with tall items such as storage batteries for electric cars, even slight overcharging will not result in uniform charging. As a result, the upper part of the electrode plate becomes a low specific gravity electrolyte, which reduces the capacity, and the lower part always remains with a high specific gravity, highly oxidizing electrolyte, which corrodes the lower edge of the electrode plate and shortens its life. This has resulted in an invitation.

For this reason, storage batteries are overcharged by about 20% of the discharge amount each time they are charged.

As a result, in addition to power consumption, a loss of fluid due to water decomposition occurs, which is commensurate with the level of overcharging, and forklift batteries typically require water replenishment once every six months.

In addition, the battery temperature rises significantly during overcharging, and the battery temperature rises in the summer, sometimes shortening the battery life.

Means for Solving the Problems The present invention employs a sludge stirring device that stirs the sludge using the scum generated from the battery, and uses a battery equipped with a 1.1-digit liquid stirring device to reduce the amount of charge to the necessary minimum. hold it down,
In addition, the present invention aims to provide a storage battery that eliminates the concentration difference between electrolytes and eliminates the drawbacks of the conventional technology.

EXAMPLE Hereinafter, an example of the present invention will be explained in detail with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of a storage battery equipped with an electrolyte stirring device of the present invention, and FIG. 2 is a partially cutaway perspective view of the electrolyte stirring device. In the figure, A is a battery case containing a group of electrode plates, B is a group of electrode plates,
C is an electrolytic solution, and D is an electrolytic solution stirring device. The electrolyte stirring device D has a lower end opening at the bottom of the battery container, a -F end opening near the lowest electrolyte level, a liquid circulation cylinder 1 having a small hole 4 in the middle, and a lower end opening opening near the small hole 4. A siphon strap is provided with a gas collection chamber 2 disposed below the electrode plate group B for collecting the gas generated from the electrode plate group B. Contacted by 3. Further, a gas reservoir 5 is formed at the -F@ opening of the liquid circulation cylinder l by covering it with a cap whose bottom surface is open, or by folding the upper end of the liquid circulation cylinder in an inverted J shape. ing. In the embodiment shown in the drawings, the liquid circulation gil has a bent and bent shape at the small hole 4, but this is due to the need for mold cutting when the stirring device is integrally molded from synthetic resin. This is to make it easier, and it is no different from a straight line in terms of its function. The stirring device of the present invention has the ellipse as described above,
When gas is generated from the electrode plate group B during charging of the storage battery, this gas is captured and accumulated in the gas collection chamber 2. As debris accumulates, the electrolyte that has entered the inverted U-shaped sipon strap 3 is discharged from the small hole 4 into the liquid circulation cylinder l. When the amount of accumulated gas in the gas collection chamber increases and reaches the position of the small hole 4, this gas is pushed out as bubbles from the small hole 4 into the liquid circulation cylinder l, and the size of the gas bubbles and the casl in the gas collection chamber increases. When the size of the gas bubbles becomes large enough to overcome the liquid pressure of the electrolyte above the small hole 4 of the inverted liquid circulation cylinder, the gas bubbles push up the electrolyte above the small hole, that is, the electrolyte in this part of the liquid circulation cylinder. The electrolyte rises and is discharged from the upper opening of the liquid circulation cylinder 1 together with the electrolyte. At the same time, the liquid pressure inside the liquid circulation cylinder 1 decreases, so that the electrolyte at the bottom of the battery enters from the opening 1 at the bottom of the liquid circulation cylinder. ．． L, the electrolytic solution with a high specific gravity in the liquid circulation cylinder 1 is pushed upward from the small hole 4 and becomes stable at a position where it balances with the liquid pressure of the electrolytic solution around the liquid circulation pipe. From this state, the gas generated from the electrode plate group is again collected in the waste collection chamber 2, and the above operation is repeated.

In addition, in the device of the present invention, a waste reservoir 5 is provided at the upper end opening of the liquid circulation cylinder 1, and the electrolyte in the liquid circulation cylinder 1 is isolated from the surrounding electrolyte by the gas phase. Even if the top opening is below the surface of the electrolyte, the electrolyte around the top opening will not flow back into the liquid circulation cylinder, and the electrolyte will always move from the bottom to the top of the liquid circulation cylinder. .

FIG. 3 is a perspective view showing the stirring device (JT) attached to the electrode plate group. The stirring device D is fixed by being inserted into the gap between the strap 6 and the pole pole 7 to which the ears of the electrode plate group are welded, the separator, etc., and the battery case. A cathode plate is usually disposed on the end plate of the electrode plate group.

Additives are added to the active material of the cathode plate to prevent it from expanding and to facilitate electrochemical reactions, so it is necessary to press it from the outside with a plate-shaped spacer. When the stirring device is installed, two spacers may be placed on both sides of the liquid circulation cylinder because there is a liquid circulation ftJ1, but there is a problem that they may be misaligned when inserting the electrode plate group B into the battery case A. There is a problem of poor workability.

FIG. 4 shows a cardboard-shaped synthetic resin spacer made of polypropylene or the like, and has approximately the same thickness as the liquid circulation cylinder.

A groove that matches the width of the residue circulation tube is provided at the part where the liquid circulation tube will touch when assembled into the battery. By reducing the number of spacers to one, the problems associated with using two spacers can be solved.

In Fig. 3, the stirring device I) is attached after placing the spacer 8, but after installing the stirring device I),
It is also possible to arrange the spacer 8 upside down as shown in FIG.

A liquid stirring battery A in which the liquid stirring device shown in FIGS. 1, 2, 3, and 4 is housed in a battery forklift battery, and a normal battery 11 without a liquid stirring device are usually combined together. FIG. 5 shows the increase in the specific gravity of the electrolyte when the battery was charged after 100% discharge using a quasi-constant voltage charger. In the case of a normal battery, the charge amount is approximately 120% after 10 hours of charging time, and the specific gravity of the electrolyte has increased by F above the specified value of 1,280.

On the other hand, the liquid stirring battery I has a charging time of 8 hours and a charge amount of approximately 11 hours.
At 0%, the electrolyte specific gravity has risen to the specified value.

In this way, a battery equipped with a liquid stirring device can be fully charged with about half the amount of overcharging.

Effects of the Invention The feature of the liquid stirred battery of the present invention is that charging can be completed in about half the amount of overcharging compared to the conventional type, and that it has the following advantages and can be mass-produced at low cost.

■The water replenishment interval will be extended (by doubling the liquid level displacement, the water replenishment interval will be approximately four times the current one). ■It saves electricity.

■It is one of the countermeasures against temperature rise during heavy duty. ■High-capacity lid batteries can also be installed.

■Stratification phenomenon can be prevented and reliability improved.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing an embodiment of a storage battery equipped with an electrolyte stirring device of the present invention, Fig. 2 is a partially cutaway perspective view of the electrolyte stirring device, and Fig. 3 is a liquid stirring device D attached to the electrode plate group. Figure 4 is a perspective view showing the synthetic resin spacer installed.
Figure 5 is a diagram comparing the changes in electrolyzer specific gravity due to charging of a storage battery with an electrolytic solution stirring device 6 and a conventional battery with an unacceptable charge. , C...electrolyte 1!v liquid, D...electrolyte stirring device, 1...liquid circulation cylinder, 2...
・Scatter collection chamber, 3... Inverted U-shaped Saibon strap, 4... Small hole,
5... Scum storage, 6... Sluff゜, 7... Pole Pillar, 8... Space Cup Sword

Claims (1)

[Claims] 1. A liquid circulation cylinder having a small hole in the middle part and arranged vertically in the electrolyte, and a lower end opening below the small hole position of the liquid circulation cylinder, arranged on the electrode plate group. an electrolytic solution stirring device, the small hole and the gas collecting chamber are connected by an inverted U-shaped siphon strap, and a gas reservoir is provided at the upper end opening of the liquid circulation cylinder. 1. A storage battery equipped with an electrolytic solution stirring device, characterized in that a synthetic resin spacer having a groove along the liquid circulation cylinder in the mounting portion of the liquid circulation cylinder is brought into contact with the end plate of the electrode plate group.