Polar plate for battery, manufacturing method of polar plate, polar plate group with polar plates and lead storage battery

Abstract

The invention provides a polar plate for a polar plate for a battery, a manufacturing method of the polar plate, a polar plate group with the polar plates and a lead storage battery. The polar plate comprises a current collector and a active substance layer kept by the current collector, wherein the current collector is an expanded grid manufactured with a cutting and drawing method, the polar plate is composed of two protruding end parts with protrusions and a flat middle part between the two end parts, the thickness of each end part is more than that of the middle part, and when the thickness of the middle part is set to be H2 and the height difference between each end part and the middle part is H1, the ratio of H1 / H2 is 3-9%. According to the invention, by means of designing the polar plate to be provided with protrusions at the end parts to form the protruding end parts with the protrusions and making the thickness of each end part of the polar plate more than that of other parts of the polar plate, a distance between a positive polar plate and a negative polar plate is properly enlarged, so that the cycle life, capacity and charging efficiency of the battery are greatly increased.

Description

technical field [0001] The present invention relates to a pole plate for a battery and a manufacturing method thereof, in particular to a pole plate for a battery with a simple process, low cost and good capacity, cycle life, and charging efficiency, a manufacturing method thereof, and a pole plate with the pole plate Plate packs and lead accumulators. Background technique [0002] In addition to being used as a power source for starting vehicles and as a backup power source, lead-acid batteries are also widely used as main power sources, that is, as power sources for independent charging and discharging equipment such as electric vehicles, electric bicycles, electric motorcycles, electric scooters, small Power sources for electric mopeds, golf carts, etc., batteries for solar energy, etc. In these applications, the working characteristics of lead-acid batteries are: large current when starting, small discharge current when driving, and long discharge time. At the same tim...

AI Technical Summary

Problems solved by technology

[0006] Chinese utility model patent CN201820837U discloses a kind of equal deflection plaster board for double-sided coating. The technical problem to be solved is: the working surface at the lower end of the existing plaster board is flat. The pressure makes the plate concave, the distance between the masking plate and the plate increases, and the amount of paste in the middle increases relatively. The raw plate after double-sided coating is often thicker in the middle and thinner on both sides, and the plate is seriously bent after curing. , affecting the quality of the plate

The technical problem to be solved by this method is: increase the porosity of the positive plate by reducing the paste density of the positive plate, thereby improving the rapid discharge characteristics of the sealed lead-acid battery, but in order to suppress the reduction of the life due to the reduction of the paste density , an aqueous dispersion of polytetrafluoroethylene added to the lead paste

Moreover, in the prior art, the design of the pole plate has also been considered and some methods have been found, for example, as mentioned above, by reducing the density of the lead paste of the positive plate to improve the porosity of the positive plate, thereby improving the performance of the sealed lead-acid battery. Rapid discharge characteristics, but reducing the density of the lead paste will lead to a decrease in battery life; or the thickness of the two ends of the plate is thinner than the middle part, so as to overcome the weak retention of the active material at the ends and the active material is easy to fall off. shortcoming

[0013] However, when the surface of the pole plate is flat and the thickness of the pole plate is the same, because more sulfuric acid cannot be stored to make the chemical reaction proceed more, the capacity is difficult to continue to increase, and it may not be able to reach the designed initial capacity

Moreover, when the surface of the electrode plate is flat and the thickness of the electrode plate is uniform, the distance between the positive electrode plate and the negative electrode plate is too small, there is a hidden danger of short circuit, which affects the cycle life

In addition, because the plate is too flat and the contact between the separator and the plate is too close, the oxygen generated by the positive plate at the end of charging cannot diffuse to the negative electrode in time, which affects the recombination of oxygen and reduces the charging efficiency.

[0014] Therefore, although various studies have been carried out on the performance and structure of the pole plate in the prior art, how to ensure that the lead-acid battery has good cycle life, capacity characteristics and charging efficiency at the same time through the design of the pole plate shape and structure has not been considered.

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