New energy automobile lithium battery charging and discharging protection circuit and controllable voltage source adjusting method

Abstract

The invention discloses a new energy automobile lithium battery charging and discharging protection circuit and a controllable voltage source adjusting method. The protection circuit comprises an over-charge protection module, a voltage control module, an over-current operation module, a discharge protection module and an over-discharge adjustment module, and a triode Q3 in the over-charge protection module obtains a feedback voltage value of the voltage control module through a base electrode end, so that an emitter electrode end is conducted to prevent over-charge voltage from passing through; a transistor Q6 in the voltage control module serves as a contactless switch to transmit control ground voltage to the over-current operation module; an operational amplifier U2 in the over-currentoperation module starts a protection device by comparing a preset ground current parameter and a received current, and a capacitor C4 provides a storage voltage for the operational amplifier U2 to improve the operation speed; a diode D7 in the discharge protection module is used for unidirectional output of the voltage to prevent reverse transmission of the voltage during discharge; and a capacitor C8 in the over-discharge adjusting module is used for generating power shortage of a lithium battery B1 during over-discharge so as to provide a storage voltage to reduce the damage of discharge equipment.

Description

technical field [0001] The invention relates to a lithium battery technology, in particular to a new energy vehicle lithium battery charge and discharge protection circuit and a controllable voltage source adjustment method. Background technique [0002] In recent years, human beings have paid more attention to environmental protection and adopted different methods to reduce environmental pollution. The development of new energy vehicles reduces exhaust emissions and effectively protects the environment. Electric vehicles do not produce exhaust, have no pollution, and reduce noise. In order to avoid the impact on the environment, the source of power for new energy is to store electric energy through lithium batteries for operation, which puts forward higher requirements for the safety of lithium batteries. [0003] Lithium batteries cannot be effectively controlled when the input voltage changes when charging, resulting in continuous transmission of damaged voltage, affectin...

AI Technical Summary

Problems solved by technology

[0003] Lithium batteries cannot be effectively controlled when the input voltage changes when charging, resulting in continuous transmission of damaged voltage, affecting the stability of computing and detection devices, and causing potential safety hazards; failure to timely control when the damaged voltage enters will cause Lithium batteries are overcharged and physical reactions occur, thereby reducing the storage of electric energy. The periodicity of lithium battery replacement not only fails to protect the environment, but also aggravates environmental pollution; when the lithium battery is discharged, it will continue to output the stored electric energy, causing the voltage to drop slowly. When the voltage is lower than the set value, the discharge continues to form excessive discharge, causing the electrode active material to be damaged and lose the ability to respond, shortening the service life of the lithium battery

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