A lithium battery management system and method of research

Source: 2020 - 04 - 11 hits: instructed a lithium battery management system and methods of the study: in this paper, we study the lithium battery application management system include: single lithium batteries, lithium battery charge and discharge management module, the over-current protection module lithium-ion batteries, lithium battery voltage over-current protection module and lithium battery booster module. Real-time monitoring of lithium battery charge and discharge current and voltage. 【 Keywords 】 Lithium battery charge and discharge over discharge protection over-current protection 1 overview lithium batteries has small volume, light weight, than the big, long cycle life, low self-discharge rate, no memory effect, green environmental protection, wide working temperature range, etc. Lithium battery has been widely used in mobile communication devices, such as mobile ring equipment and radio frequency fiber distribution system, network signal monitoring, etc. , to implement these equipment state monitoring of power supply. Usually equipment monitoring and control system in power supply voltage 9 V, a single section of lithium ion battery rated voltage 3. 7 V, the common solution is to use more than one kind of lithium battery series, to meet the requirements of application system of power supply voltage, because there was some difference of every cell in the factory, with the increase of the cycle number, a series of lithium ion battery all differences will be more and more big, cause the battery charging time of each cell, cause the battery, charge or discharge, easy to cause damage to the battery. In order to overcome the lack of lithium battery application, especially the problem of charging and discharging lithium battery series imbalances, management system based on single lithium battery application and technical scheme can effectively solve the inherent flaw. 2. Management requirements of the lithium battery charging and discharging lithium battery overcharge, over discharge, over current, high temperature, low temperature use can contribute to the physical and chemical damage of lithium-ion batteries. Ideal lithium battery charging process: charging, constant current, constant voltage charging, charging a trickle charging, the battery. Constantly monitor the voltage of lithium-ion batteries, and comparing with the threshold. If the low voltage start charging again. Ideal lithium battery charging voltage and current curve is shown in figure 1. Single lithium battery management system block diagram of a single lithium battery's nominal voltage is usually 3. 7 v, is often difficult to satisfy the requirement of the equipment monitoring and control system for power supply. Single lithium battery charging and discharging management system includes: the lithium battery charge and discharge management module, lithium battery exile electricity protection module, lithium battery protection module and over-current voltage lithium battery voltage booster module. System principle block diagram is shown in figure 2. Lithium battery charging management system input part is external power supply, power supply output part is application system work. Among them, the lithium battery charge and discharge management module, the lithium battery voltage discharge protection module and lithium battery discharge overcurrent protection module is only on the logical division, can be integrated in physics.