18650 battery 3500mah

　　Introduction to the functions of the 18650 battery 3500mah management system

　　Introduction to the functions of the 18650 battery 3500mah management system - The basic function of the 18650 battery 3500mah management system is to monitor the working conditions of individual cells, such as individual 18650 battery 3500mah voltage, operating current, ambient temperature, etc. Protect the 18650 battery 3500mah to avoid shortened 18650 battery 3500mah life, damage, or even explosions, fires and other accidents endangering personal safety when the 18650 battery 3500mah is working under extreme conditions. The role and characteristics of 18650 battery 3500mah management system BMS

　　With the popularization of new energy concepts, new energy vehicles have gradually entered thousands of households. As a new car purchase option for ordinary people, new energy vehicles have begun to encroach on the market that originally belonged to traditional fuel vehicles. As the largest market for new energy vehicles at present, In the market, Chinese companies rely on new energy vehicles to stand on the same starting line as foreign companies for the first time. New technologies and new processes are constantly emerging, giving China's new energy vehicle industry more confidence to look at the world and focus on the future.

　　When it comes to the core of traditional fuel vehicles, it is naturally inseparable from the so-called three major parts: engine, chassis and gearbox. On these three major parts, it is a consensus that China's technology lags behind foreign automobile manufacturers led by Germany, Japan and the United States. There are also commonly known as the three major parts in new energy electric vehicles: batteries, motors and electronic controls. Since new energy electric vehicles are still a relatively new industry globally, the starting points of companies in various countries are not very different, which also makes our country The company has the conditions to compete with foreign companies in the automobile, a multi-purpose power-driven tool invented in 1886. This article focuses on introducing the electronic control of the three major components of new energy electric vehicles (commonly known in the industry as 18650 battery 3500mah management system BMS).

　　The biggest difference between new energy electric vehicles and traditional fuel vehicles is the use of power batteries as the driving force. As an important link connecting the 18650 battery 3500mah pack, vehicle system and motor, the importance of the 18650 battery 3500mah management system BMS is self-evident. Many new vehicles at home and abroad Energy vehicle companies all regard 18650 battery 3500mah management systems as the core technology of the company. The most famous example is the well-known Tesla. Among the three major components of Tesla’s electric vehicles, the 18650 battery 3500mah comes from Panasonic and the motor is supplied from Taiwan. suppliers, and only the 18650 battery 3500mah management system is the core technology independently developed by Tesla. Most of the core intellectual property rights applied by Tesla between 2008 and 2015 are related to the 18650 battery 3500mah management system. This shows that the 18650 battery 3500mah management system plays an important role in new energy vehicles. importance. In China, the R&D and production of 18650 battery 3500mah management system BMS are mainly concentrated in these three types of enterprises:

　　1. New energy vehicle manufacturer, representative company: BYD

　　2. 18650 battery 3500mah pack manufacturer, representative companies: Waterma, Pride

　　3. Professional BMS manufacturers, representative companies: Huizhou Yineng, Shenzhen Guoxin Power

　　What exactly does the 18650 battery 3500mah management system BMS do?

　　The 18650 battery 3500mah management system BMS is a new product that was born in this century. Because the electrochemical reaction is difficult to control and the performance changes of materials during the process are elusive, such a housekeeper is needed to constantly supervise and adjust the behavior of the 18650 battery 3500mah pack in order to To ensure safe use, its main functions are:

　　1. Accurately estimate the state of charge of the power 18650 battery 3500mah pack

　　Accurately estimate the state of charge (SOC) of the power 18650 battery 3500mah pack, that is, the remaining 18650 battery 3500mah capacity, to ensure that the SOC is maintained within a reasonable range and prevent damage to the 18650 battery 3500mah due to overcharge or overdischarge, thereby predicting the storage capacity of hybrid vehicles at any time. How much energy is left in the 18650 battery 3500mah or the state of charge of the energy storage 18650 battery 3500mah.

　　2. Dynamically monitor the working status of the power 18650 battery 3500mah pack

　　During the 18650 battery 3500mah charging and discharging process, the terminal voltage and temperature of each 18650 battery 3500mah in the power 18650 battery 3500mah pack, the charging and discharging current, and the total voltage of the 18650 battery 3500mah pack are collected in real time to prevent the 18650 battery 3500mah from overcharging or overdischarging. At the same time, the 18650 battery 3500mah status can be given in time, problematic batteries can be selected, and the reliability and efficiency of the entire 18650 battery 3500mah pack can be maintained, making it possible to implement the remaining power estimation model. In addition, a usage history file for each 18650 battery 3500mah must be established to provide information for further optimization and development of new batteries, chargers, motors, etc., and to provide a basis for offline analysis of system failures.

　　3. Balance between single cells

　　That is to charge the individual batteries equally, so that each 18650 battery 3500mah in the 18650 battery 3500mah pack reaches a balanced and consistent state. Balance technology is a key technology of 18650 battery 3500mah energy management system that the world is currently researching and developing.

　　What features should a technologically advanced BMS currently on the market have?

　　Advanced technology and stable and reliable products will be the core features of future BMS products. So what kind of products are technologically advanced, stable and reliable products? Because the BMS standards of major domestic companies are still not unified, we will take the performance characteristics of Shenzhen Guoxin Power's BMS as an example to explain from the four dimensions of technology, function, quality, and standards.

　　Advanced technology:

　　1. Enterprises master the core algorithm of 18650 battery 3500mah SOC;

　　2. Master health status estimation, maximum allowable instantaneous (5s/30s) and continuous charge and discharge power estimation;

　　3. Master efficient balancing management technology, advanced heat dissipation mechanism, and can support a maximum passive balancing current of 200mA;

　　4. Master the industry-leading high-precision measurement technology, with total flow and total pressure accuracy up to 0.5% FSR;

　　5. Optional multi-function data recorder supports wireless transmission, large-capacity storage, GPS and other cloud platform functions;

　　6. Optional active balancing module, the maximum balancing current can reach 5A, and 24 strings on a single board can be flexibly selected;

　　Security features:

　　1. 18650 battery 3500mah safety management: with reliable overcharge/over-discharge protection, over-current/over-temperature/low-temperature protection, and multi-level fault diagnosis protection;

　　2. High-voltage safety management: equipped with high-voltage relay adhesion detection, high-voltage interlock detection with high interference resistance, and advanced high-voltage insulation monitoring;

　　3. Equipped with voltage and temperature acquisition line breakage diagnosis function;

　　4. The 18650 battery 3500mah voltage acquisition module has safety mechanisms such as loop overcurrent and short-circuit protection, making the circuit more reliable;

　　5. It has flexible configurations of 5~36 strings and 5~48 strings all-in-one machine, suitable for various mainstream solutions in the industry;

　　Stable quality:

　　1. All components are selected from automotive grade components and have a high standard operating temperature range of -40℃~85℃;

　　2. Wider and more reliable temperature monitoring, the monitoring range can reach -40~125℃;

　　Comply with standard specifications:

　　1. Supports charging national standards GBT20234-2015 and GBT27930-2015;

　　2. Support the requirements of product functional safety life cycle management in the ISO26262 international safety standard;

　　3. Support CCp calibration protocol, UDS, OBD-ii diagnostic protocol.

　　The dilemma of domestic 18650 battery 3500mah management system BMS

　　The development of new energy vehicles has not been smooth sailing. In the past two years, with the extensive promotion and use of new energy vehicles, we have also heard a lot of scandals about new energy vehicles: spontaneous combustion, false cruising range, etc. Why do these occur? What about usage issues? Not using a 18650 battery 3500mah management system or using an inferior and immature 18650 battery 3500mah management system is the main reason. In fact, the safety of new energy vehicles has always been one of the key tasks of the government and the automobile industry. Not long ago, four ministries including the Ministry of Science and Technology, the Ministry of Finance, the Ministry of Industry and Information Technology, and the National Development and Reform Commission jointly issued a safety order for the demonstration and promotion of new energy vehicles (i.e., the "Letter on Strengthening the Safety Management of the Demonstration and Promotion of Energy-saving and New Energy Vehicles"), emphasizing the importance of investment in the demonstration and promotion of new energy vehicles. All plug-in hybrid vehicles and pure electric vehicles in demonstration operation must be equipped with a vehicle operating technical status real-time monitoring system (BMS for short), especially to strengthen the monitoring of the working status of power batteries and fuel cells.

　　There are various reasons for the spontaneous combustion of electric vehicles. Installing a 18650 battery 3500mah management system does not mean you can sit back and relax. For example, in terms of safety, accuracy, life, discharge capacity, etc., a single 18650 battery 3500mah can be charged and discharged 2,000 times, but a 18650 battery 3500mah pack may only be charged 1,000 times. , if equipped with an immature BMS, it cannot accurately monitor the 18650 battery 3500mah charge and discharge status in real time, which can easily cause excessive local power consumption of the 18650 battery 3500mah core, generate local heat, and the information cannot be transmitted to the driver, which can easily lead to 18650 battery 3500mah spontaneous combustion. Industry insiders believe that installing an excellent 18650 battery 3500mah management BMS can effectively improve 18650 battery 3500mah utilization, prevent 18650 battery 3500mah overcharge and overdischarge, extend the service life of the 18650 battery 3500mah, monitor the operating status of the 18650 battery 3500mah pack and each 18650 battery 3500mah cell, and effectively prevent 18650 battery 3500mah failure. In case of emergency, the driver will be warned of the emergency in advance to gain time to ensure safety.

　　The future of new energy vehicles and 18650 battery 3500mah management systems

　　China's new energy vehicle industry began in the early 21st century and has only developed for more than ten years. Due to people's desire for environmental protection and renewable energy, new energy vehicles have ushered in development opportunities. Since then, they have been out of control. In a long time In the future, new energy vehicles will serve as challengers to occupy the vast market that originally belonged to traditional fuel vehicles, and due to the needs of social development, this kind of market share encroachment can be expected.

　　While looking forward to the rapid development of new energy vehicles, we must clearly realize that the development of technology is the foundation for industry development, and stable, efficient, safe and reliable products are the embodiment of technology. We must know that the current domestic The new energy vehicle industry is not friendly. Frequent spontaneous combustion incidents and false cruising ranges of electric vehicles have exposed the current imperfect standards in the design, testing and production of new energy 18650 battery 3500mah packs and 18650 battery 3500mah management systems in China.

　　There are currently hundreds of BMS companies in China, while there are only a few in developed countries in Europe and the United States. Large new energy vehicle manufacturers either choose their own 18650 battery 3500mah management systems or adopt internationally competitive BMS manufacturers led by Germany, Japan and the United States. In fact, China There is no shortage of excellent BMS manufacturers in China. Shenzhen Guoxin Dynamics mentioned in the article is a company with core competitiveness that focuses on product quality. Its BMS system has been introduced into mass production and is deployed in Shaanxi Tongjia and Zotye. Some new energy models of automobiles can also be used in pure electric or hybrid low-speed vehicles, passenger cars, logistics vehicles, field vehicles, buses, tour buses, energy storage systems and other fields according to actual needs. They are stable and efficient. , safe and reliable BMS platform products are highly praised by customers.

　　The lack of technical parameters and standards, and there is no authoritative organization to conduct authoritative testing of BMS produced by manufacturers, is the current dilemma of the domestic BMS market, resulting in a mixed bag of good and bad BMS products, making it difficult to promote on a large scale. At the same time, many domestic automobile manufacturers and 18650 battery 3500mah pAC companies currently do not have enough understanding of the importance of BMS. They believe that as long as each single 18650 battery 3500mah cell can be connected, the vehicle operation can be guaranteed. They are not optimistic about its safety and blindly purchase BMS. In the pursuit of low prices and in order to sign contracts, some unscrupulous BMS suppliers only reduce BMS functional indicators or simply castrate some functions, thereby burying safety risks. This is also irresponsible and harmful to the entire industry. Only by establishing unified industry standards as soon as possible, suppressing manufacturers that do not meet market requirements, and establishing a sound testing system can 18650 battery 3500mah management systems and new energy vehicles have a sustainable future. This is also the demand of many manufacturers and consumers.

　　Basic functions of the 18650 battery 3500mah management system

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

　　2) Protect the 18650 battery 3500mah to avoid shortened 18650 battery 3500mah life, damage, or even explosions, fires and other accidents endangering personal safety when the 18650 battery 3500mah is working under extreme conditions.

　　Generally speaking, the 18650 battery 3500mah management system must have the following circuit protection functions: overvoltage and undervoltage protection, overcurrent and short circuit protection, overtemperature and undertemperature protection, and multiple protections for the 18650 battery 3500mah to 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 18650 battery 3500mah, power tool and e-bike applications.

　　3 Electric vehicles pose higher challenges to 18650 battery 3500mah management systems

　　The electric vehicle 18650 battery 3500mah integration 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 18650 battery 3500mah management 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 18650 battery 3500mah voltage and temperature; achieving high-efficiency balance of the 18650 battery 3500mah, giving full play to the capacity of the 18650 battery 3500mah integrated system, thereby increasing the life of the 18650 battery 3500mah integrated system, while reducing heat generation;

　　Estimation and display of 18650 battery 3500mah health and remaining power;

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

　　Powertrain technology must ensure that the 18650 battery 3500mah's potential is fully utilized under the premise of any safe use, ensuring 18650 battery 3500mah performance and extending 18650 battery 3500mah life;

　　18650 battery 3500mah temperature and heat dissipation management ensures that the 18650 battery 3500mah system 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 18650 battery 3500mah management systems.

　　Technology Zone 220V AC to 12V DC reference design The current status of domestic lithium 18650 battery 3500mah ternary material patent technology layout What is the echelon utilization of automotive power batteries? It will become a hot issue for a long time. New energy vehicle design cannot be ignored Cells and 18650 battery 3500mah materials 2020 China’s automotive power 18650 battery 3500mah pack shipments and forecasts in 2020

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