Smart battery system structure analysis

Source: 2020 - 04 - 11 19:11 hits: smart battery system composed of intelligent battery can be divided into two parts: the lithium battery and management system at low temperature. In figure 3. 5 for smart structure diagram of the battery. Battery part composed of 4 battery series, each group of cells containing eight parallel 2. 5 ah lithium battery. Management system of the protection by both positive and negative current circuit protection actuators, which is the protection of actuators by an independent dedicated IC implementation, constitute the protection function of the second 'line'. In figure 3. 5 smart battery structure schematic according to system function definition, the function of the intelligent battery diagram as shown in figure 3. 6. According to the functional division, the management system can be divided into the detection mechanism, judgment, decision-making mechanism, power estimation mechanism, information exchange and storage mechanism, implementation mechanism and balance mechanism. Testing agency to complete the current sensor, voltage acquisition and temperature detection, and other functions. Electricity estimator is according to the testing agencies provide current data, combined with the battery's current situation, through a set of algorithm process to estimate the remaining power. Judgment decision-making body is used to determine whether happened over current, over voltage, over discharge, over temperature anomalies, and according to the situation of the battery to make decisions, to control the actuator. Charging and discharging paths between the actuator and disconnect. The function of information exchange and storage mechanism, which is used to complete with instruments and equipment of information exchange, and record abnormal information. In the process of charging, the balanced mechanism can eliminate the inconsistent due to speed difference caused by the charge of the battery. System working process according to different functional modules, the system can be divided into abnormal monitoring module, exception handling module, communication module, the module of power estimation and low power management module. In figure 3. 7 for smart work flow chart of the battery. Based on the characteristics of battery parameters, monitoring parameters can be divided into fast response and slow response parameters. Quick response including the charging current and discharge current. These two parameters values may be due to improper operation or the unexpected and sudden change of external environment. This requires system has a very fast response speed, to ensure that be able to deal with the abnormal current in a timely manner. Slow response includes two parameters: the battery voltage and battery temperature. Battery voltage fluctuation is mainly caused by the battery charge and discharge, the voltage value is relatively stable in a certain time. Discharge, battery capacity, the greater the voltage change. Change is mainly due to the lithium ion battery temperature when the positive and negative charge and discharge of insert and the insert. In the case of short circuit or abnormal high current, battery internal resistance may lead to the instantaneous temperature rise, but the exception can be prevent by monitoring the current. Based on the characteristics of fast response and slow response, monitoring system can be divided into continuous monitoring and regular monitoring. Continuous monitoring functions need round-the-clock operation, so the subsystem design needs to attach great importance to the design of low power consumption. Periodic monitoring is a kind of intermittent operation mode, its length can be combined with power and accuracy of circuit. In figure 3. 7 the principle diagram of the working process of the intelligent battery low power management module is the core of energy-saving system. It controls all function modules when to begin to work, when to stop. The continuous monitoring functions need round-the-clock operation, do not need to manage low power management module. Periodic monitoring function is determined by low power management module, start work time. Workflow is roughly as follows: low power management module first wait for the arrival of the monitoring period, open the regular monitoring module, monitoring data transmission to the exception handling estimate function module and power module. Exception handling module according to the result of monitoring feedback corresponding processing and recorded in memory. Peripheral device can read these abnormal log.