JPS61126764A - Enclosed lead battery - Google Patents

Abstract

PURPOSE:To improve service life of a lead battery, by making the outer side of the both end walls in the direction of laminating electrode plates into about a half circle with larger thickness at the center, and binding the side of the battery casing with heat-resisting belts. CONSTITUTION:The battery casing 1 is formed of shorter side outer walls 2 made into about a half circle with larger thickness at the center, facing the direction of the electrode plates lamination which consists of anode and cathode plates, and separators of micro-glassfiber mats, and longer side plain outer walls 4 square to the electrode plates lamination direction. To reinforce the shorter side walls 2 of the battery casing 1, it is bound with heat-resisting belts such as copper belts, to prevent expansion of the casing 1 when the temperature of the battery rises. Therefore, the mechanical strength of the battery casing 1 is increased broadly, and the adhesion between the active substance surfaces of cathode and anode plates, and the separators of micro-glassfiber mats is stabilized, resulting in an extensive improvement of the service life.

Description

[Detailed description of the invention] Industrial applications The present invention relates to improvements in sealed lead-acid batteries.

Conventional technology Conventionally, an electrode plate group comprising positive and negative electrode plates and a separator made of a fine glass fiber mat is impregnated with electrolyte to make it non-fluid, and the oxygen gas generated during charging is absorbed into the cathode plate. In sealed lead-acid batteries, which are sealed by
An electrode plate group is produced using a separator that has a predetermined thickness when a pressure of 20 ky/d- is applied while maintaining the thickness of the cathode plate within a predetermined range, and in a battery case that stores the electrode plate group. , shock resistance and heat resistance (2) Even with excellent polypropylene, the pressure with adjacent cells is almost the same, so physical and mechanical strength is not required, and multiple electrode plate groups can be placed nearby. In a battery that is housed and has a sealing valve that maintains the internal pressure of the battery, which is the only one that has a centralized exhaust structure, the partition wall of the battery case may have the function of preventing leakage of electrolyte.Also, among the outer walls of the battery case, Since the battery case is made up of multiple blocks on the circumferential side, it is reinforced in the vertical direction by the partition wall of the battery case, so expansion of the battery case is extremely small.
However, since it does not face the positive and negative electrode plates, it has little effect on battery performance. However, since both short sides of the outer wall of the battery case are unidirectional (the product of positive and negative electrode plates), the expansion of the battery case directly influences the pressurization of the electrode plates.

Problems to be solved by the invention These sealed lead-acid batteries are equipped with a sealing valve made of rubber or the like that prevents outside air from entering the battery and maintains the internal pressure of the battery. If the battery case expands, it is difficult to restore the cypress dimensions. As shown in FIG. This can also be said from the fact that it is not effective even if the thickness is larger than that of 3'. Therefore, in a sealed lead-acid battery that has a structure in which the electrolyte is impregnated into the electrode plates and becomes non-fluid, the pressure applied to the electrode plates depends on the battery cell 1' (= = decrease in the pressure applied to the electrode plates). When the pressure on the electrode plate group decreases, the adhesion between the positive and negative electrode active material surfaces and the separator made of fine glass fiber mats decreases, so that the positive and negative electrode active materials and the separator become The electrical resistance with the electrolyte increases, inhibiting the electrochemical reaction. Therefore, during discharge, as the battery temperature decreases and the current density increases, not only the battery performance decreases, but also the life performance decreases. Note that reference numeral 4 denotes a planar long side outer wall perpendicular to one direction of the battery case 1'.

Means for Solving the Problem The present invention eliminates the above-mentioned drawbacks by increasing the thickness of the central part so that the short sides of both outer walls of the battery case in the stacking direction of the electrode plates are approximately semicircular. , further (: The side part of the battery case is tied tightly with a heat-resistant band.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail as an embodiment of the present invention, in which it is possible to prevent the battery case from expanding due to the internal pressure of the battery due to an increase in the battery temperature, and to maintain the pressurization of the electrode plate group at a constant state.

The battery case 1 consists of a substantially semicircular short side outer wall section with a large wall thickness in the central part facing each other in the stacking direction of the electrode plate groups (two opposing electrode plates, and a separator consisting of a cathode plate and a fine glass fiber mat). 2 and form a planar long side outer wall 4 that intersects with the electrode plate group stacking direction.Furthermore, in order to reinforce the short side outer wall 2 of the battery case 1, the battery case 1
The heat-resistant band 5 made of steel or the like can prevent the battery case 1 from expanding due to a rise in battery temperature.

3 is a partition wall.

In the present invention, the short side outer wall part 2 has a semicircular shape (-the thickness of the central part is increased, and the side part of the battery case l is tied tightly with the band 5), compared to the conventional battery case 1. Physical and mechanical strength increased significantly (2).

Therefore, the electrolyte is extremely! In a sealed lead-acid battery ζ2 impregnated with iE# to make it non-fluid, the life performance is significantly increased because the adhesion between the positive and negative plate active material surfaces and the separator made of a fine glass fiber mat is stabilized. This made it possible to make significant improvements. This is explained in Figure 2. Figure 2 shows the NS4 for automobiles.
40'C/240A discharge SA using 0Z humanoid battery
Comparing the lead-acid battery A of the present invention and the conventional lead-acid battery B, the life test results show that the conventional lead-acid battery B had a charging/discharging frequency of around s, ooo times, but the lead-acid battery B of the present invention Storage battery A is excellent at around 6,000 cycles.

Effects of the Invention As mentioned above, the present invention has great industrial value, such as being able to improve the life performance of lead-acid batteries.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing one embodiment of the battery case according to the present invention, Fig. 2 is a life performance characteristic diagram of the lead-acid battery according to the present invention and a conventional lead-acid battery, and Fig. 3 is a perspective view of a conventional battery case. Deru 1 1 is the battery case, 2 is the outer wall of the short side, 5 is the Teitai patent applicant Figure 1 Figure 2 Charging and discharging test collection Cx103 times) Ryo 3 Figure

Claims (1)

[Claims] A sealed lead-acid battery characterized in that the outer wall of the short side of the battery case in the stacking direction of the electrode plates is formed in a substantially semicircular shape, and the side surface of the battery case has a heat-resistant band member tied tightly. .