Lead storage battery

Abstract

This lead acid storage battery comprises a plurality of cells, each of which comprises an electrode plate group, an electrolyte solution and a cell chamber. The electrode plate group and the electrolyte solution are contained in the cell chamber. The electrode plate group is obtained by alternately arranging a plurality of positive electrode plates and a plurality of negative electrode plates with separators being interposed therebetween. The separators are AGM separators, and each separator has a density within the range of 117-129 g / dm3. The collectors of the positive electrode plates and / or the negative electrode plates are expanded grids, and each electrode plate is composed of projected end portions each having a projection and a flat intermediate portion between the end portions. The thickness of the end portions is larger than the thickness of the intermediate portion.

Description

technical field [0001] The present invention relates to a lead-acid storage battery, and specifically relates to a lead-acid storage battery excellent in all of life characteristics, charging efficiency characteristics, and high-rate discharge characteristics. Background technique [0002] Lead-acid batteries are not only used for starting vehicle power supply, lighting power supply and backup power supply, but also widely used for main power supply, that is, as a power supply for independent charging and discharging equipment such as electric vehicles, electric forklifts, electric forklifts, electric buses, electric bicycles, Power sources for electric motorcycles, electric scooters, small electric mopeds, golf carts, electric locomotives, etc., and electric energy storage devices such as solar batteries. In these applications, the working characteristics of lead-acid batteries are: large current when starting, small discharge current when driving, and long discharge time. ...

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.

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