EFB start-stop battery positive and negative electrode with high charging acceptance capacity and preparation method thereof

Abstract

The invention relates to an EFB start-stop battery positive and negative electrode with high charge acceptance capacity and a preparation method thereof, belongs to the technical field of EFB start-stop batteries, and mainly solves the problem that the high-temperature life of a battery is reduced due to carbon fibers contained in existing lead paste. The main features are as follows: an anode lead paste formula includes 0.2% -- 0.4% of expanded graphite, 0.08% - 0.12% of short fiber, 0.1% - 0.3% of metal sulfate additive, 0.6% - 1.0% of 4BS seed, 9% - 12% of pure water, 8% - 10% of 1.38 g / cm3sulfuric acid solution and the balance of lead powder; a cathode lead paste formula includes 0.1 to 0.2 percent of carbon nanotube slurry, 0.1 to 0.2 percent of carbon black A, 0.02 to 0.06 percent of carbon black B, 0.08 to 0.12 percent of short fiber, 0.15 to 0.25 percent of organic additive A, 0.08 to 0.12 percent of organic additive B, 0.5 to 0.8 percent of nanometer barium sulfate, 8 to 10 percent of pure water, 8 to 10 percent of 1.38 g / cm3 sulfuric acid solution and the balance of lead powder. The invention has the characteristics of greatly improving battery charging acceptance capacity and further prolonging the battery life, and is mainly used for EFB starting and stopping batteries with high charging acceptance capacity.

Description

technical field [0001] The invention belongs to the technical field of EFB start-stop batteries, and in particular relates to a positive and negative electrode of an EFB start-stop battery with high charge acceptance and a preparation method thereof. Background technique [0002] The car start-stop system means that the engine is automatically turned off when the vehicle is temporarily stopped (such as waiting for a red light) while the vehicle is running. When it is necessary to continue moving, the system automatically restarts the engine. In this system, when the engine is started frequently, the battery needs to support frequent high-current discharge; when the hybrid system provides power to the wheels, the battery needs to provide energy support, which can meet the needs of electrical equipment such as audio and lighting in the car; on-board charger When charging the battery, the battery must have a strong charge acceptance performance. At present, both AGM and EFB ba...

AI Technical Summary

Problems solved by technology

Chinese invention patent CN107240686A, the application discloses a high-performance high-current start-stop battery lead paste and a start-stop battery. In the environment, the carbon fiber will be gradually oxidized, and the bonding force between the active materials will become weaker, which will increase the risk of softening and falling off of the active materials, and reduce the high temperature life.

Although the addition of several types of carbon materials with a total amount of more than 1% will increase the porosity of the positive active material, improve the capacity of the battery and high-rate discharge, but after the carbon material is oxidized, the overall conductive network of the positive electrode will be missing, which is inevitable. It will lead to poor charging acceptance of the positive electrode of the battery

At the same time, higher carbon additives are also not conducive to the formation of 4BS in the positive electrode.

High-carbon additives are introduced into the negative electrode formula, and the filling properties of the lead paste and the water loss of the battery are not explained, but there are obviously side effects

In addition, humic acid is still used in it, and the source of humic acid leads to the instability of its batch and impurity content, which leads to the risk of battery consistency

[0005] Existing formulations seek to improve a certain performance of the battery too much, and fail to take into account the overall performance requirements of the EFB battery