JPS63269453A - Strap forming device for lead battery - Google Patents

Abstract

PURPOSE:To enable a strap to be formed with more stable quality by allocating a strap-forming mold, which moves vertically in molten lead metal. CONSTITUTION:A strap-forming mold 1 is allocated in a molten lead metal 3 having a sufficient heat capacity at a definite temperature. Hence, the molten lead metal 3 in the strap-forming mold 1 can be kept at a constant temperature, and accordingly an apparent heat capacity of the molten lead metal 3 becomes large enough. The arrangement enables a stable work under static condition to carry out, avoiding an unstable forming process of a strap 5 that requires time-consciousness in abrupt temperature changes.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an apparatus for forming straps for lead batteries, including sealed lead batteries.

A conventional lead-acid battery has a part called a strap that integrates a large number of electrode plates within the cell and electrically connects adjacent cells. Methods for forming this part include one-burner type and cast-on type. The one-burner method is a method in which the straps are formed by melting the edges of the electrode plates and supplying separately prepared lead, which is called added lead.
The cast-on method is a method in which the strap is formed by inserting the ears of the electrode plate group into lead water poured into a mold. A method of forming a strap using the conventional cast-on method will be explained with reference to FIG. First, lead water is poured into the heated strap forming mold l using a ladle 2 (see (a)).

From this point on, the lead bath begins to cool rapidly, but if you do not match the timing with this cooling rate (see (b) before inserting the ear 4 of the electrode plate group), the lead bath will be formed after waiting for it to solidify. Pull the strap out of the mold ((C), (dl)
reference).

Problems to be Solved by the Invention The biggest problem with the conventional method of forming straps using the cast-on method as described above is that the lead rapidly cools as it is poured into the strap forming mold 1. The ears 4 of the electrode plate group are inserted into the hot water 3 at the right time. The cooling rate of the lead bath 3 is on the order of seconds, and the timing of inserting the lug 4 is off. In other words, the third
The ideal state of strap formation is shown in (al) of the figure.
The timing of inserting ear 4 of the electrode plate group may be a little early,
If the temperature of the poured lead water is a little higher than the set value, or if the ambient temperature is one level higher and the cooling rate becomes a little slower, a situation similar to IBL will quickly occur. In the opposite case, a situation like tc) will occur, and in both cases, the mechanical strength of the strap 5 and the corrosion resistance in the electrolyte will decrease.

Means for Solving the Problems In order to solve the problems of the prior art described above, in the present invention, the strap forming mold is placed in a lead bath having a sufficient heat capacity and at a predetermined temperature.

As a result, the temperature of the lead water in the strap forming mold can be kept constant, and the apparent heat capacity of the lead water has become sufficiently large. Therefore, instead of the unstable method of forming straps at the right time under sudden temperature changes, it becomes possible to perform stable operations under static conditions.

Embodiment FIG. 1 shows an embodiment of the present invention, in which a strap forming mold 1 is disposed in a lead bath 3 and moves up and down with respect to the surface of the bath.The operating state thereof will be described below.

(al shows the strap forming mold 1 being submerged in lead water 3 with a sufficiently large heat capacity at a predetermined temperature, and the lead water 3 being supplied to the strap forming part of the mold l. Next, (b)
The mold 1 is raised until the upper surface of the mold 1 matches the level of the lead bath 3 as shown in FIG. 1 and enters a standby state. At this ζ, the ears 4 of the electrode plate group are lowered at a constant speed as shown in (cl), and maintained in the state of (di for a specified period of time. After being maintained at a specified temperature for a specified period of time, (e
), raise the mold 1 above the level of the lead bath 3 in order to cool and solidify it. Note that heat removal measures such as blowing cold air can be taken here. Thereafter, after the formed strap 5 is extracted from the mold 1, the process returns to step (at) again.

The temperature of the lead bath 3 and the holding time in the state shown in (di) depend on the composition of the lead alloy used for the strap 5, the alloy composition of the electrode grid, and the final finished state (
For example, it should be determined by (state like at) in FIG.

Effect of the invention As described above, the present invention has the following effects.

(11) Compared to conventional methods, it is possible to work under static conditions, so it is possible to form straps with more stable quality.

(2) Since the temperature of the lead bath during strap formation can be accurately kept constant, the conditions for forming the target strap can be easily and accurately set. especially,
It is possible to set conditions such as low temperature and long time that were not possible with conventional methods.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing the process of forming a strap according to an embodiment of the present invention, Fig. 2 is an explanatory diagram showing the process of forming a strap by the conventional cast-on method, and Fig. 3 is an explanatory diagram showing the process of forming a strap by the conventional cast-on method. It is an explanatory view showing the states of various straps.

Claims (1)

[Claims] A strap forming device for a lead battery, characterized in that a strap forming mold that moves up and down with respect to the hot water level is placed in lead hot water.