Deep analysis of intelligent charger charging technology and vehicle power system
Lithium-ion battery pack chargers are not balanced enough to cause overcharge and discharge problems, which seriously damage their service life. This paper proposes a new intelligent charger charging mode, which makes the battery pack safer and more reliable to charge the charger, which can extend its service life, increase safety and reduce the cost of use.
1. Car lithium ion battery management system
As the monitoring "brain" of electric vehicle batteries, the battery management system (BMS) can monitor the remaining battery power in hybrid electric vehicles, predict the power intensity of the battery, and facilitate the understanding of the entire battery system and the control of the vehicle system. .
In pure electric vehicles, the BMS has intelligent adjustment functions such as predicting remaining battery power, predicting mileage, and troubleshooting. BMS is particularly effective for lithium-ion batteries, which can improve battery usage, extend battery life, and increase battery safety. BMS will be the key technology for the future development of electric vehicles.
Analysis of vehicle power battery system and charger charging technology
The data acquisition module in the BMS measures the voltage, current and temperature of the battery pack, and then transmits the collected data to the thermal management module, the security management module, and displays the data. The thermal management module controls the battery cell temperature to ensure that the battery pack is within the optimal temperature range.
The safety management module judges the voltage, current, temperature and state of charge (SOC) estimation results of the battery pack, and issues a fault alarm when a fault occurs and promptly takes an emergency protection measure such as an open circuit. The state estimation module performs SOC and health state (SOH) estimation based on the collected battery state data.
At present, it is mainly SOC estimation, and the SOH estimation technology is still not mature. The energy management module controls the charging and discharging process of the battery, including battery power balance management, which is used to eliminate the inconsistency of the power of each unit in the battery pack. The data communication module adopts the way of CAN communication to realize communication between the BMS and the in-vehicle device and the off-board device.
The core functions of BMS are SOC estimation, balance management and thermal management. In addition, it also has other functions such as charge and discharge management, precharger charge management and so on. During the charging and discharging process of the battery, it is necessary to manage according to the environmental parameters, battery status and other related parameters, and set the optimal charging and discharging curve of the battery, for example, setting the charging current of the charging device, the charging upper limit voltage value of the charger, and the lower limit voltage value of the discharging. The capacitive load of the high-voltage system circuit of an electric vehicle is equivalent to a short circuit at the moment of power-on, so pre-charger charging management is required to prevent the transient current surge on the high-voltage circuit.