The electric vehicle battery management system (BMS) is an important link between the vehicle power battery and the electric vehicle. It integrates the monitoring and management of the battery or battery pack to ensure that the battery or battery pack is safe and reliable and outputs in the best condition. power. BMS can realize important functions such as real-time monitoring of batteries, automatic balancing, and intelligent charging and discharging. While effectively ensuring battery safety, it can also monitor the remaining battery power. Through effective battery management, the cruising range of electric vehicles can be improved. It is The power battery pack is an indispensable and important component and is of great significance to the normal operation of electric vehicles. Only through effective control and management of complex and numerous battery packs can we break through the bottleneck in the promotion and popularization of electric vehicles. Tesla's battery management system can be said to be the most mature system today. Thanks to the full application of deep learning and artificial intelligence, Tesla's BMS can continuously obtain big data of actual driving, and then self-strengthen the algorithm, thus Make the Tesla battery pack last relatively longer. Range is currently the main issue facing the increase in the penetration rate of electric vehicles, and Tesla has demonstrated a differentiated competitive advantage in this regard by relying on its leading design concepts. From the perspective of foreign markets, BMS, like batteries, is an auto component produced by the OEM, and the OEM is placed at the top of the pyramid. BMS starts from the design of functional definition, which is led by the OEM. Then it finds a third-party design company for product design, and finally finds a manufacturer for production. The three parties jointly decide on the BMS matching solution for the battery pack. The main participants in the BMS market are vehicle companies, auto parts companies, and battery companies: OEMs rely on their deep understanding of vehicle control and parameter matching, and their strong financial strength and technology accumulation to develop products that meet their own product needs. Matching BMS, such as Tesla, Toyota Pruis, Nissan Leaf, GM Volt, etc., are all developed by OEMs; large auto parts companies such as Bosch, Delphi, Denso, Preh, CalsonicKansei, etc. use their own The R&D advantages in related products and long-term good cooperative relations with OEMs also occupy an important position in the BMS market; in addition, another important participant in the BMS market is battery manufacturers, such as LG, Samsung SDI, A123, etc. Their BMS is mainly matched with their own battery products. In other words, BMS is extremely important for vehicle manufacturers, battery PACK manufacturers, or third-party BMS manufacturers. Technically speaking, vehicle manufacturers and battery manufacturers need to understand BMS technology, otherwise they cannot better match the performance of the vehicle and battery system. The importance of the battery management system (BMS) is self-evident, and the best reflection is that companies need to recruit a large number of engineers and the salary level of engineers is very high. There are a large number of recruitment positions related to battery management system BMS. Searching for "battery management system BMS" on a well-known domestic recruitment website shows a large number (100+) of BMS recruitment positions and well-known new energy vehicles, power battery companies, etc. After a rough calculation, the website recruits "battery management system BMS" "There are as many as 500 related positions. The highest salary level is over one million per year. In addition to the large number of positions related to battery management system BMS being recruited, the benefits offered by various companies are also really attractive. Among them, a certain automobile company in Guangzhou has offered the position of "BMS Battery Management System Professional Chief Engineer" with a maximum annual salary of 1.32 million. Of course, the relevant requirements are not low, including a bachelor's degree or above, more than 1 year of work experience, and an age of 35-45 years old. The average salary level is significantly higher than other industries and higher than other positions in the new energy automobile industry. Electric Zhijia System sorted out the overall salary level of the battery management system BMS recruited and found that the minimum salary is generally above 18,000 per month, and the average monthly salary level is 30,000-40,000, and of course there are also 40,000-50,000 per month. , and the working experience requirement is generally 3-5 years, and higher requirements are 5-7 years. At present, the new energy vehicle industry is developing in full swing around the world, and the domestic development momentum is even stronger. The annual production and sales growth rate is basically above 50%. According to incomplete statistics, there are more than 100 domestic new energy vehicle companies, hundreds of battery companies (including vehicle batteries and energy storage batteries), and more than 100 third-party BMS companies, large and small. The actual industrialization (volume production) of the battery management system BMS will take about 10 years. The rapid growth of the industry, the lag in talent training, and the needs of many enterprises (vehicle manufacturers, battery factories, third-party BMS factories) have resulted in a sharp shortage of BMS engineers. This trend will continue for a long time, because The speed of talent cultivation has never kept pace with the speed of industry development. Moreover, the current school education has always been out of touch with the needs of employers. The college students trained cannot meet the needs of employers, because the knowledge that battery management system BMS engineers need to master is very comprehensive. How to become a qualified BMS engineer? At least nine major aspects of content are required, including new energy vehicle structure and principles, power battery basics, IS026262 functional safety standard, control strategy development and MATLAB application, AUTOSAR vehicle development system architecture, battery modeling and state estimation algorithm, and power battery thermal management technology. , battery management system design and implementation technology, power battery testing and verification, etc. 1. Structure and principles of new energy vehicles. How are new energy vehicles and electric vehicles defined? What are the positions and functions of new energy vehicle power battery systems, motor drive systems, new energy vehicle high-voltage systems, and new energy vehicle accessories in the entire vehicle? 2. Basic development of power battery management system requires understanding of the basic structure and working principle of the battery, main performance parameters (such as rated voltage, rated power, energy density, power density, etc.) and testing methods, and basic battery characteristics (temperature characteristics, discharge characteristics, etc.) and analysis methods. 3. IS026262 functional safety standard As electronic and electrical systems become more integrated and complex, their safety becomes increasingly important. Therefore, functional safety considerations should be ingrained in engineers’ design thinking. ISO26262 is a functional safety standard formulated by the International Organization for Standardization specifically for automotive electronic and electrical systems, and has been widely implemented in the automotive industry. 4. Control strategy development and MATLAB application control strategy development processes, specifications and required software tools and functional modules. Practical application of MATLAB/Simulink in automotive control strategy development, and modeling specifications (MAAB). 5. AUTOSAR Automotive Open System Architecture AUTOSAR, or Automotive Open System Architecture, is a set of software architecture standardization solutions that support distributed, function-driven automotive electronic software development methods and electronic control units. Currently, the AUTOSAR alliance has included BMW, Volkswagen, Ford, Toyota, BOSCH, Continental and many other automobile companies and automotive electronics companies. 6. Battery modeling and state estimation algorithm. Many parameters of power batteries have non-linear characteristics, which brings extremely high challenges to battery state assessment and modeling. Therefore, it has become one of the core tasks of the development of power battery management systems. . 7. Power battery thermal management technology In the development of power battery management systems, the thermal characteristics of the battery are one of the important considerations. Therefore, it is necessary to study the thermal characteristics of the battery and then build a thermal management module in the management system. 8. Battery management system design and implementation technology Battery management system development work includes the design of hardware (battery balancing, high-voltage sampling, insulation detection, etc.) and software (system algorithms, fault diagnosis, etc.), and functionality and safety need to be considered. 9. Power battery testing and verification Testing and verification are an important part of the development of power battery management systems. In the job, you need to be familiar with the testing and verification requirements and standards of power batteries, be able to formulate test plans, and improve system design through test analysis. Whether you are a member of an automobile manufacturer, a battery PACK factory or a third-party BMS company, whether you are working in software, hardware, testing, technology, projects, quality, after-sales and other positions, if you want to get that enviable annual salary , the knowledge you need to master is not only enough for what you are doing now, but also a comprehensive and systematic study of BMS. If you are a student preparing for employment, or an employee who has been employed for a period of time, and want to switch to the new energy vehicle industry, becoming a BMS may be a very good choice. How can you be one step ahead? Of course, you need to do a systematic and comprehensive study of BMS.

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