Lead acid battery charge protection and optimization technology

Abstract

A lead acid battery for an electric vehicle has to face more use requirements of big capacity, long cycle life, big discharge current, short charging time and the like because the lead acid battery powers the vehicle, particularly a higher requirement on the charging technology. For the conventional three-stage charging technology, on the one hand, if the set breakover voltage from the first stage to the second stage is lower, the battery is insufficiently charged, which causes the quick reduction of the capacity of the battery, and if the set breakover voltage is higher, the loss of electrolyte and heating of the battery are caused due to positive overcharge; on the other hand, because different batteries are different in additive formulas, the ideal breakover voltage and breakover current are different; and the lead acid battery is passively charged by a charger, if the charger and the battery require different rated voltage or anode-cathode directions, the damage of the battery or charger can be caused. Because a charging inference function module lowers the charging potential of the battery by continuously using negative pulse to discharge at the later stage of charging, the polarization potential difference between the charger and the battery is ensured, and the battery can be charged more fully; pole plate active materials of the battery are electrochemically reacted at a low potential, so that the gassing amount generated is greatly reduced; simultaneously, due to enough charging break time, the oxygen separated from the anode is ensured to undergo reaction with hydrogen to obtain water when reaching the cathode, and the enough time for heat dissipation is also ensured; and the service life of the lead acid battery is prolonged.

Description

technical field [0001] The invention relates to the technical field of charging a lead-acid storage battery, and in particular establishes a technical basis and a realization model for an electric vehicle lead-acid storage battery charging protection and optimization scheme. Background technique [0002] Lead-acid batteries for electric vehicles are also called valve-regulated lead-acid batteries. Due to the power supply needs of vehicles, lead-acid batteries have to face more problems such as large capacity, long cycle life, large discharge current, and short charging time. The use requirements, especially in the charging technology of valve-regulated lead-acid batteries for electric vehicles, have put forward higher requirements. [0003] In order to ensure the continuous mileage of electric vehicles, the capacity of valve-regulated lead-acid batteries for electric vehicles is generally large, basically in the hundreds of watt-hour capacity, and it is required to be fully ...

AI Technical Summary

Problems solved by technology

In a practical sense, it is to determine the ideal turning voltage, because the three-stage charger factory component error, operating temperature difference, humidity difference and other factors make the actual three-stage charging is not ideal

[0004] In the known electric vehicle lead-acid battery charging technology, the lead-acid battery is passively charged by the charger. If the charger is different from the battery rated voltage or the positive and negative directions, it will cause damage to the battery or the charger.

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