As an important means of transportation, electric vehicles are widely used by consumers for daily commuting and recreation. With the rapid improvement of people’s living standard, electric cars are very popular for their low-carbon, economic, energy-saving and convenience features. As of 2019, the number of electric two-wheelers in China exceeded 300 million. As of 2019, the penetration of electric two-wheelers in China has exceeded 300 million. With the rapid growth of the takeout and delivery industries in recent years, the sales of electric two-wheelers have boomed. According to statistics, as of 2019, China’s takeout users exceeded 400 million, reaching 416 million, up 16.2 percent year-on-year. The number of express deliveries reached 63.5 billion, up 25.3 percent year-on-year, thus electric car sales have also raised.
Electric cars effectively save energy and facilitate travel, but they also face a series of challenges, the core of which being the performance, cost and safety of power batteries. The power battery heats up when it’s working, which is normally controllable. However, when the temperature of the battery or the charging voltage is too high, chemical reactions will occur within the battery one after another, resulting in a chain reaction that will cause the internal pressure and temperature of the battery to rise sharply, which will then lead to thermal runaway of the battery that will cause explosion or combustion.
In recent years, there have been numerous reports of fire caused by EV charging. According to the Ministry of Emergency Management, 233 people have died from e-bike fires across the country since 2013, including 34 big fires that caused fatalities and 142 deaths. Recently, a fire caused by electromobile battery charging resulted in a floor fire and killed a courier who rented the house in Rihui Xincun in Xuhui District, Shanghai. The fire department sent 10 fire engines and 65 firefighters to put out the fire at the site. Improving the safety of EV charging to reduce accidents and casualties is a major problem for EV.
SIMCom SIM7600CE Battery Management System Solution
The Battery Management System (BMS) has become an crucial link between the automotive power battery and the electric vehicle. On the one hand, BMS detects, collects and preliminarily calculates the real-time status parameters of the battery, and controls the on-off of the power supply circuit according to the comparison between the detected value and the permitted value. On the other hand, it reports the key data collected to the vehicle controller, and receives instructions from the controller to coordinate with other systems on the vehicle. BMS enables the analysis of battery status, battery safety protection, energy control and management, battery information management, etc. BMS for electric vehicles can’t collect data without data transmission of the modules. The BMS solution equipped with SIMCom SIM7600CE modules effectively improves the battery performance. Its GPS function improves the safety of EV charging and facilitates EV management.
SIMCom SIM7600CE is a Cat.4 module with excellent performance. Each component in the module is constantly optimized to ensure that the antenna has a large enough receiving area to receive signals, avoid inaccurate GPS positioning, erratic trajectory on the map and imprecise positioning due to incomplete signal reception. Meanwhile, it ensures RF performance, stability of conductivity to enable rapid networking of the system. For the takeout industry, accurate vehicle positioning can help the management team to continuously optimize routes and improve delivery efficiency. Improving battery safety and terminating the charging process in time when abnormity is detected can effectively improve the safety of EV charging and reduce accident rate.
The BMS with SIM7600CE has the following features.
- 01．Accurate estimation of the charge state of the power battery pack : The BMS accurately estimates the remaining battery charge of the power battery pack to ensure that the SOC is maintained within a reasonable range and thus prevent damage to the battery due to overcharging or overdischarge.
- 02．Dynamic monitoring of the operating status of the power battery pack : In the process of battery charging and discharging, the terminal voltage，temperature charge and discharge and total pack voltage of each battery in the power battery pack are collected in real time to prevent over-charging or over-discharging of the battery. Meanwhile, it can show the battery condition in time and select the defective battery to maintain the reliability and high efficiency of the whole battery pack.
- 03．Logging of vehicle tracks : BMS solution with SIMCom SIM7600CE module with GPS positioning function facilitates rider positioning for takeout or delivery industry and keeps driving record online.
- 04．Creating a Battery Profile : Battery usage history files provide information for further optimization and development of new types of electricity, chargers, motors, etc., and provide a basis for offline analysis of system failures.