JP3010691B2 - Battery forming method for sealed lead-acid batteries - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a method for forming a battery case of a sealed lead-acid battery.

2. Description of the Related Art Conventionally, this type of battery formation has been performed continuously at a constant current or in the middle of the battery formation in order to improve the formation efficiency of the electrode plate.

A typical example of the conventional model is a nominal voltage of 6 V and a rated capacity of 20 hours.
The following is an example of a battery case specification of a 10Ah battery. In FIG. 3, reference numeral 1 denotes an anode plate connected in parallel with five plates. Reference numeral 2 denotes a cathode plate which is connected in parallel to six sheets. An electrode group is formed by combining these with the three separators.
Is inserted into. Then, the electrolytic solution is poured to a position 5 where the electrode plate group is completely immersed, and formation of a battery case is started. FIG. 4 shows the pattern of the battery case formation.

Charge at 2A constant current for 30 hours, then discharge at 2A for 2 hours, then
This is a pattern of charging for 7 hours at 2A.

SUMMARY OF THE INVENTION However, in the above-described conventional configuration, there is a variation in the completion of the charging of the electrode plate, that is, the so-called formation, the variation in the initial capacity of the battery is large, and the variation in the self-discharge characteristics of the battery is also large. There was a problem.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and provides a sealed lead-acid battery in which variation in formation after battery formation is reduced, variation in initial capacity is small, and variation in self-discharge characteristics is small. The purpose is to:

Means for Solving the Problems In order to achieve this object, the battery case formation method of the present invention incorporates an electrode group consisting of unformed electrode plates into a battery case, and forms the electrode plates in the battery case. A method for forming a battery of a sealed lead-acid battery in which the amount of electrolyte is limited to a state in which the electrode group is exposed from the electrolyte surface at the end of the formation, wherein the electrolyte surface is higher than the electrode plate. Discharge is performed at a certain time.

Effect By this method, when the battery case formation is started again after the discharge in the middle, since the electrolyte is sufficiently supplied to the electrode plate, the formation of the electrode plate is uniformly performed, and the variation in the initial capacity of the battery is small. In addition, the variation in the self-discharge characteristics is reduced.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an example of a battery case formation pattern according to an embodiment of the present invention. After charging at 2A constant current for 18 hours, discharge at 2A for 2 hours and then charge at 2A for 19 hours. In the electrode plate used in the present invention, the anode plate had a width (W) of 42 mm and a height (H) of 65 m.
m, thickness (T) = 3.4mm, cathode plate W = 42mm, H = 65mm, T =
2.0 mm, and the structure of the electrode group is the same as that of the conventional example shown in FIG. The amount of electrolyte injected per cell was 93 cc. FIG. 2 shows the liquid surface position (height) 6 of the electrolytic solution at the time of discharge performed in the course of battery case formation for the embodiment of the present invention and the conventional case formation pattern shown in FIG. , B. As can be seen from FIG. 2B, in the conventional example, the liquid surface of the electrolytic solution was lower than the height 7 of the electrode plate, and the upper part of the electrode plate was not immersed in the electrolytic solution. In the example,
It can be seen that the liquid surface of the electrolytic solution is higher than the height 7 of the electrode plate, and that the entire electrode plate is immersed in the electrolytic solution.

FIG. 5 shows the initial capacity (0.25 CA / 5.25 V termination) of the battery which was subjected to the battery case formation according to the above battery case formation pattern. FIG. 6 shows the self-discharge characteristics of the battery (remaining capacity after being left at 60 ° C. for 2 weeks). 5 and 6, it can be seen that the battery A of the example of the present invention has a smaller variation in initial capacity and a smaller variation in self-discharge characteristics than the battery B of the conventional example.

FIG. 7 shows the relationship between the level of the electrolytic solution and the battery characteristics, that is, the variation in the initial capacity and the variation in the self-discharge characteristics when discharging is performed during the formation of the battery case. From FIG. 7, if the level of the electrolyte is higher than the height of the electrode plate,
It turned out that there was a similar effect.

As described above, according to the present invention, when the battery case formation is started again after the intermediate discharge, the electrode plate is sufficiently supplied with the electrolytic solution, so that the formation of the electrode plate is uniformly performed, and the initial state of the battery is improved. It is possible to obtain a sealed lead-acid battery in which the variation in the capacity is small and the variation in the self-discharge characteristic is small.

In the embodiment of the present invention, the discharge during the formation of the battery container is performed once, but the same effect can be obtained even if the discharge is performed several times.

Effect of the Invention As described above, by maintaining the electrolyte surface at a higher level than the electrode plate and performing discharge during the formation of the battery case, the variation in the initial capacity is small, and the variation in the self-discharge characteristics is further reduced. A small sealed lead-acid battery can be provided.

[Brief description of the drawings]

FIG. 1 is a pattern diagram of battery case formation in one embodiment of the present invention, and FIG. 2 is a schematic diagram showing a position of an electrolyte surface during discharge performed during battery case formation in the embodiment of the present invention and a conventional example. ,
FIG. 3 is a schematic diagram of the structure of the battery, FIG. 4 is a pattern diagram of battery case formation in a conventional example, FIG. 5 is a diagram showing the initial capacity of the battery,
FIG. 6 is a diagram showing the self-discharge characteristics, and FIG. 7 is a diagram showing the relationship between the height of the electrolyte surface and the battery characteristics when discharging is performed during the formation of the battery case. 6 ... Position of electrolyte surface at the time of electric discharge performed during battery case formation, 7 ... Height of electrode plate.

Continuation of the front page (56) References JP-A-47-40021 (JP, A) JP-A-54-1841 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01M 4 / twenty two

Claims (1)

(57) [Claims] An electrode group consisting of an unformed electrode plate is incorporated in a battery case, and the electrode plate is formed in the battery case. Electrolysis is performed until the electrode group is exposed from the electrolytic solution at the end of the formation. A battery case formation method for a sealed lead-acid battery, wherein a discharge is performed when an electrolyte surface is higher than an electrode plate in a battery case formation method for a sealed lead-acid battery having a limited amount of liquid.