CR2450 battery

　　Management system to improve electric vehicle CR2450 batteryperformance

　　1Electric vehicle CR2450 batterymanagement system design

　　As energy shortages, oil prices rise, and urban environmental pollution become increasingly serious, the development and utilization of new energy sources that can replace oil are increasingly valued by governments around the world. In the new energy system, the CR2450 batterysystem is an indispensable and important component. In recent years, electric bicycles, hybrid vehicles, electric vehicles, fuel cell vehicles, etc. powered by lithium batteries have received increasing attention from the market. The application of power batteries in the transportation field is of great significance for reducing greenhouse gas emissions, reducing air pollution, and applying new energy. Among them, lithium batteries have attracted more and more attention due to their high energy density, high number of recycles, light weight, and green environmental protection. Therefore, they have been widely used in portable handheld devices such as mobile phones, laptops, and power tools, and have been widely used in portable handheld devices such as mobile phones, laptops, and power tools. It has begun to enter high-power applications such as electric vehicles and electric vehicles, becoming a hot spot in the development of global electric vehicles.

　　However, because lithium batteries may be damaged due to abuse such as heating, overcharge/over-discharge current, vibration, and extrusion, the CR2450 batterylife may be shortened, and even fires and explosions may occur. Therefore, safety issues have become a major issue in the commercial promotion of power lithium batteries. the main constraints. Safety standards, safety evaluation methods, safety and reliability control of the CR2450 batterymanufacturing process, and improvement of CR2450 batterysafety and reliability through the optimization of positive and negative electrode materials, electrolytes and separators are the key to ensuring large-scale power supply for safe, low-cost, long-life lithium-ion batteries. Lithium-ion batteries are safe, reliable and the key to practical use. As the core component of CR2450 batteryprotection and management, the CR2450 batterymanagement system must not only ensure the safe and reliable use of the battery, but also give full play to the battery's capabilities and extend its service life. As a bridge between the battery, the vehicle management system, and the driver, the CR2450 batterymanagement system plays an increasingly critical role in the performance of electric vehicles.

　　2 Main functions of CR2450 batterymanagement system

　　The CR2450 batterymanagement system is closely integrated with the power CR2450 batteryof electric vehicles. It continuously detects the voltage, current, and temperature of the battery. It also performs leakage detection, thermal management, CR2450 batterybalancing management, alarm reminders, calculation of remaining capacity, discharge power, and reports. In the SOC&SOH state, it also uses an algorithm to control the maximum output power according to the voltage, current and temperature of the CR2450 batteryto obtain the maximum mileage, and uses an algorithm to control the charger for optimal current charging. Through the CAN bus interface, it communicates with the vehicle main controller, motor controller, Energy control systems, vehicle display systems, etc. conduct real-time communication. Figure 1 is a simple block diagram of the CR2450 batterymanagement system.

　　Figure 1 Simple block diagram of the CR2450 batterymanagement system

　　Basic functions of the CR2450 batterymanagement system:

　　1) Monitor the working conditions of single cells, such as single cell voltage, working current, ambient temperature, etc.

　　2) Protect the CR2450 batteryto avoid shortened CR2450 batterylife, damage, or even explosions, fires and other accidents endangering personal safety when the CR2450 batteryis working under extreme conditions.

　　Generally speaking, the CR2450 batterymanagement system must have the following circuit protection functions: over-voltage and under-voltage protection, over-current and short-circuit protection, over-temperature and under-temperature protection, and multiple protection for the CR2450 batteryto improve the reliability of the protection and management system (hardware The protection of execution has high reliability, the protection of software execution has higher flexibility, and the protection of failure of key components of the management system provides users with the third level of protection). These features meet the needs of most mobile phone battery, power tool and e-bike applications.

　　3 Electric vehicles pose higher challenges to CR2450 batterymanagement systems

　　The electric vehicle CR2450 batteryintegration system is an open power system that communicates through the automotive-grade CAN bus and works in conjunction with the vehicle management system, charger, and motor controller to meet the vehicle's human-centered safe driving concept. Therefore, the automotive-grade CR2450 batterymanagement system must meet the requirements of TS16949 and automotive electronics, achieve high-speed data collection and high reliability, automotive-grade CAN bus communication, high anti-electromagnetic interference capabilities (the highest level of EMI/EMC requirements), and online diagnostic functions.

　　Its main functions are:

　　High-speed collection of information such as CR2450 batteryvoltage and temperature; achieving high-efficiency balance of the battery, giving full play to the capacity of the CR2450 batteryintegrated system, thereby increasing the life of the CR2450 batteryintegrated system, while reducing heat generation;

　　Estimation and display of CR2450 batteryhealth and remaining power;

　　Highly reliable communication protocol (automotive-grade CAN communication network);

　　Powertrain technology must ensure that the battery's potential is fully utilized under the premise of any safe use, ensuring CR2450 batteryperformance and extending CR2450 batterylife;

　　CR2450 batterytemperature and heat dissipation management ensures that the CR2450 batterysystem operates in an environment where the temperature is relatively stable;

　　Leakage detection and complex ground wire design.

　　Since the distribution environment of batteries in electric vehicles is very complex and operates under high voltage and high power, the requirements for EMI/EMC are very high, which brings greater challenges to the design of CR2450 batterymanagement systems.

　　4 Hierarchical and modular design of electric vehicle CR2450 batterysystem

　　Since the electric vehicle CR2450 batterysystem is integrated by hundreds or thousands of CR2450 batterycells, taking into account the space, weight distribution and safety requirements of the car, these CR2450 batterycells are divided into standard CR2450 batterymodules and distributed in different locations on the car chassis. , unified management by the powertrain and central processing unit; each standard CR2450 batterymodule also has multiple cells connected in parallel and series, managed by the module's electronic control unit, and reports the CR2450 batterymodule information to the central processing unit through the CAN bus After the central processor and powertrain unit process this information, they report the final information about the integrated system, such as remaining power, health status, and CR2450 batterycapacity-related information, to the vehicle management through the CAN bus. system. The hierarchical and modular design of the electric vehicle CR2450 batterysystem requires the hierarchical and modular design of the CR2450 batterymanagement system (Figure 2).

　　Figure 2 Hierarchical and modular electric vehicle CR2450 batterymanagement system design

　　5 Chip integration technology of CR2450 batterymanagement system

　　The automotive CR2450 batterysystem has extremely high reliability requirements, especially the high-voltage monitoring part and the CR2450 batterybalancing part. Since there are few integrated solutions, many solutions are composed of discrete components, resulting in: poor component matching and reduced signal acquisition accuracy; The increase in external nodes makes it difficult to achieve automated testing, increases test costs, reduces test coverage, and results in low system reliability; it is difficult to control the power consumption of external components; the system size is large and the cost is high.

　　O2Micro provides the world's first single-chip protection and detection solution for >5 cells in series, OZ89xx, which also supports multi-chip cascade applications. Currently, CR2450 batterymanagement system solutions using this chip have been successfully used in CR2450 batterymodule electronic control units of pure electric vehicles and hybrid vehicles.

　　Table 1 takes standard CR2450 batterymodules as an example to introduce the comparison between discrete solutions and integrated solutions.

　　It can be seen that integrated chip solutions play a very important role in improving system reliability and reducing costs, and are the core of hardware design technology in CR2450 batteryintegration technology.

　　6 Conclusion

　　In the future, power lithium batteries have broad prospects in the field of electric vehicles, and the CR2450 batterymanagement system will play a key role in the safe use of batteries and communication with vehicle management. CR2450 batterymanagement technology includes hardware design technology and software design technology, among which high-voltage mixed-signal processing technology and chip design are the core of hardware design. They are not only the key to ensuring high-reliability, high-speed, and high-precision signal collection and processing in the automotive environment, but also It is the key to improving test coverage, supporting online detection and reducing costs; the core of the software includes CR2450 batterymanagement algorithms, communication protocol support and powertrain related technologies. O2Micro is one of the world's major suppliers of CR2450 batterymanagement solutions. With its many years of experience in chip design and solution design in CR2450 batteryprotection and management, it has mastered internationally advanced CR2450 batterymanagement technology and is a global CR2450 batterymanufacturer. , system manufacturers have provided high-quality technical services and contributed to the development of electric vehicles in China.

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