JPS59217948A - Grid for lead storage battery - Google Patents

Abstract

PURPOSE:To improve initial voltage during high-rate electric discharge by specifying both the ratio of the weight of an upper parent bone having a current collecting part to the total weight of a grid and the ratio of the distance from one end of the grid to the center of the current collecting part to the total width of the grid. CONSTITUTION:A grid for a lead storage battery is formed by a material made of lead or a lead alloy. The ratio of the weight of an upper parent bone having a current collecting part to the total weight of the grid is supposed to be G(%). The ratio of the distance from one end of the grid to the center of the current collecting part to the total width of the grid is supposed to be l(%). The relationship between G and l is adjusted to be within the range surrounded by a quadrilateral determined by four vertexes A(0, 30), B(0, 22), C(50, 16) and D(50, 11) when l is plotted as obscissa and G is plotted as ordinate. By the means mentioned above, the total loss of the grid can be minimized without increasing the weight of the grid and without giving any influence on the retention of an active material. Consequently, the internal resistance of the battery is decreased thereby enabling initial voltage during high-rate electric discharge to be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the weight of a lead-acid battery lattice made of lead or alloy material, in particular of the upper rib with the current collector.

Conventionally, lead-acid battery lattice bodies have responded to the weight reduction of lead-acid batteries by reducing the amount of lead used. However, simply reducing the amount of lead causes problems, particularly in voltage characteristics during high rate discharge, due to a decrease in current collection efficiency. In order to maintain and improve performance while reducing weight and conduct electricity, it is necessary to consider the shape of the grid and the weight distribution to each part of the grid, and reduce lead while suppressing the increase in electrical resistance. ing.

In terms of manufacturing, compared to the casting method, the expanded method is used, which allows the lattice to be made thinner and has higher productivity.
Simply making the battery thinner and lighter reduces the cross-sectional area of each part of the lattice, which increases the electrical resistance, resulting in deterioration of battery performance, especially a drop in voltage during high-rate discharge. Conventionally, proposals have been made to improve current collection efficiency by increasing the length of the part close to the current collector by 1 m and reducing the weight of the farthest part, but it is necessary to keep the weight of the grid constant, minimize the electrical resistance, and systematically However, no consideration has been given to increasing the initial voltage during high-rate discharge, and therefore, it has been insufficient to reduce the electrical resistance of the lattice body, thereby improving battery performance and reducing the weight of the battery. It made things difficult.

An object of the present invention is to solve the above-mentioned problems by systematically considering the ratio of the weight of the upper rib provided with the current collector to the total weight of the lattice body, assuming that the total weight of the lattice body is constant. It is an object of the present invention to provide a lattice body for a lead-acid battery in which the electrical resistance of the lattice body is reduced and the initial voltage particularly during high rate discharge is increased.

The basic principle by which the electrical resistance of the lattice body of a lead-acid battery can be reduced by the present invention is explained with reference to the drawings.1. This will be explained in detail using X.

It was found that the current distribution is uniform within the storage battery at the beginning of high rate discharge. The first reason is thought to be that the resistance of the electrolyte is much larger than the resistance of the grid.
Assume that the lattice body receives a uniform ζ current at each part. Figure 1 shows lattice point 0 and surrounding lattice points 1 to 4. The electrical resistance between grid point 0 and surrounding grid points 1 to 4 is determined by the cross-sectional area and length of grid element 5, but the resistance between grid point 0 and surrounding grid points 1 to 4 is determined by [
, ~r4, and the potential of each lattice point θ~4 is V. −
■4, and the current flowing in (outflowing) from the other board is i. Then, at lattice point 0 and 11, by Kirchhoff's law, (V! VO) / r++ (v2-vo) /
r2+(V3 V(1) /rs+ (V4 vo
) / r< + Io? 0 holds true. This current i. The sum at each grid point is the terminal current I. If it is noted that the number of lattice points is n, it can be calculated as 1n=Io/n. Such a potential V. ~■ Since the equation with 4 as an unknown is established at each grid point, it becomes a simultaneous equation of n elements.

Next, consider the electrical loss of the grid. Loss P is voltage v1
Depending on the resistance r, it can generally be determined as p-V2/r. In other words, the loss P between lattice points 0 and 1 is P+ = (V+ Vo)''/r+. The total loss PT of the lattice body is between each lattice point. In particular, this total loss is , there is a linear relationship with the internal resistance value of the actual battery.Also, the internal resistance value of the actual battery has a linear relationship with the initial fl!E during high rate discharge. The relationship between the loss pT and the 5-grain voltage during discharge at 15°C and 150A is shown.In this way, there is a linear relationship between the total loss PT of the grid and the initial voltage during high-rate discharge.This result is , prove the validity of the above method, and
It is shown that by comparing the total loss PT, it is possible to find a lattice body with a small internal resistance and a high initial voltage during high rate discharge.

Figure 3 shows the weight ratio G (%) of the upper main rib provided with the current collector to the total weight of the lattice body, and the total loss PT of the lattice body obtained by the above method, while keeping the total weight of the lattice body constant. This shows the relationship. The one shown here is by extended band processing, and the distance from the end of the upper rib to the center of the current collecting part is 5% of the total length of the upper rib. As can be seen from FIG. 3, the total loss Pa of the lattice body is the minimum when the weight is 26 inches, but it can be said to be optimal if it is in the range of 21 to 29%. Is it better to increase the weight of the upper rib with the current collecting part to reduce the electrical resistance? If too much weight is distributed between the two parts, the molding of the lattice mesh part will decrease. Too much electrical resistance increases (7), resulting in an increase in the total loss of the grid as a whole.

Figure 4 shows the ratio of the distance R1 from one end of the upper IQ bone to the center of the current collector to the total length of the upper main rib/[qb+, when the total loss PT of the lattice body is optimized by the above method.
This figure shows the relationship between the ratio G (%) of the upper rib of the lattice body to the total weight of the lattice body. 4 points A (0, ao), B (
0,22), C(so, +6)D (50,11)
a (%l and / f
Having il allows optimization.

FIG. 5 shows the ratio of the distance from one end of the upper rib to the center of the current collecting part to the total length of the upper rib due to the extended band processing I/(41 is improved by the present invention for the 5th section,
A battery using a lattice body with an upper rib that minimizes the total loss of the lattice body and a battery using a conventional product at 15°C, 15
This is a comparison of voltages at the 5th second during 0A discharge. The weight ratio of the upper rib is 26 cm and 11%, respectively. In this case, +
We were able to achieve a 5 second voltage improvement of 0.12 V with a 2V battery. Furthermore, it is clear that the present invention is not limited to grid bodies using expanded processing.

The present invention makes it possible to minimize the total loss of the lattice body without increasing the weight of the lattice body itself or affecting the retention of the active material, as described above. As a result, the internal resistance of the battery can be reduced and the initial voltage during high rate discharge can be improved, which has great industrial value.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram of the lattice body of a lead-acid battery, Figure 2 is a relationship diagram between the total loss PT of the lattice body of a lead-acid battery and the voltage at the 5th second when discharging at 1150A at -15°C, and Figure 3 is an illustration of the lattice body of a lead-acid battery. When the total weight of the grid body of the storage battery is constant, the weight ratio G of the upper rib with the current collector to the total weight of the grid body and the total loss PT of the grid body
Figure 4 shows the relationship between the lattice body and the two-part rib when the ratio l of the distance from one end of the upper rib to the center of the current collector to the total length of the upper rib and the total loss PT of the lattice body are minimized. Figure 5 shows the relationship between the ratio G and the total weight of the lattice, and shows a battery using a lattice body with an upper rib that has an optimal weight ratio according to the present invention and a conventional lattice body that has an upper rib that does not have an optimal weight ratio. 5 seconds of discharge at 15°G and +50A using a battery. FIG. 1 to 4 are lattice points, 5 is lattice element Patent applicant Figure 3 Cr (%)

Claims (1)

[Claims] In the lattice body of a lead-acid battery made from a material made of lead or alloy, the weight ratio of the upper main rib with the current collector to the total weight of the lattice body is G (chi), and the lattice body to the total width of the lattice body is The ratio of the distance from one width part to the center of the current collector part is J
+11, if l is on the horizontal axis and G is on the vertical axis, then there are 4 points A (0°30), B (0,22), C (50
, 16), a lead-acid battery lattice body characterized by having G and l in a range surrounded by a rectangle with vertices at D (50, 11).