Bipolar battery pole plate and preparation method thereof

Abstract

The invention belongs to the technical field of lead-acid batteries, and in particular relates to a polar plate of a bipolar battery and a preparation method thereof. The bipolar battery plate includes a bipolar grid, a positive active material and a negative active material, and the bipolar grid is composed of titanium foil and copper plate, and the bipolar grid is positively The lead layer is electroplated on both sides of the negative electrode at the same time, and then the bipolar battery plate prepared by filling the positive active material and the negative active material has high power, high mass specific energy, less gas evolution, strong mechanical strength and corrosion resistance. The current and potential distribution of the plate is uniform; the preparation method of the invention can reduce production costs, reduce environmental protection pressure and improve battery performance.

Description

technical field [0001] The invention belongs to the technical field of lead-acid batteries, and in particular relates to a polar plate of a bipolar battery and a preparation method thereof. Background technique [0002] Bipolar lead-acid battery belongs to a new structure of lead-acid battery. It is compact in structure and uses less lead. During the production process, the operator's exposure to lead is greatly reduced, and the electrical connection between battery cells is greatly shortened. Many advantages. However, the technology has the following four technical bottlenecks: [0003] (1) The corrosion resistance and electrical conductivity of traditional lead alloys cannot meet the requirements of bipolar batteries. After long-term charge and discharge cycles of bipolar batteries, the bipolar grid is prone to corrosive perforation, resulting in short circuits. At the same time, the low electrical conductivity of lead alloys also limits the high power characteristics of...

AI Technical Summary

Problems solved by technology

[0003] (1) The corrosion resistance and electrical conductivity of traditional lead alloys cannot meet the requirements of bipolar batteries. After long-term charge and discharge cycles of bipolar batteries, bipolar grids are prone to corrosive perforation, resulting in short circuits

At the same time, the low conductivity of lead alloys also limits the high power characteristics of bipolar batteries.

[0004] (2) In order to reduce the water loss of the battery, improve the charge acceptance of the battery, reduce the oxygen evolution of the positive electrode and the hydrogen evolution of the negative electrode, and ensure the mechanical strength of the electrode, so as to meet the operational requirements of the manufacturing process, a more advanced grid material is proposed. High requirements, pure lead material has high hydrogen evolution potential and oxygen evolution potential, but poor mechanical strength, lead-antimony alloy has high mechanical strength, but low hydrogen evolution potential, lead-calcium alloy has high hydrogen evolution potential and good Mechanical strength, but the corrosion resistance of the alloy is poor

[0006] (4) Bipolar batteries are tightly assembled, but for batteries used in deep cycles, the expansion of the active material and the stress corrosion and growth of the grid can easily cause deformation of the battery, thereby affecting the sealing performance between the electrodes

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