The development of electric and intelligent automobiles has accelerated the conversion of parts and components from mechanical systems to electronic systems.

　　Taking the BMS field as an example, Gaogong Lithium Battery Technology and Application learned that currently commonly used communication methods in the BMS industry include CAN communication and daisy chain communication. CAN communication technology is mature and stable, but it takes up a lot of space, high power consumption and cost. High, while the daisy chain communication method is low in cost, but has high EMC difficulties and poor scalability.

　　As electric vehicles improve their lightweight, reliability, and intelligence, wireless BMS has become an important direction for technology research and development and application, and has gradually entered industrialization from the early research and development stage.

　　According to the memorandum agreement, Sensata Technology will provide wireless communication modules and wireless communication solutions for automotive battery management systems to Honeycomb Energy and become a strategic partner of Honeycomb Energy. Cellular Energy leverages the platform advantages of its own battery pack products to work with Sensata to complete the development of BMS wireless communication modules.

　　Compared with the traditional BMS transmission method, the wireless communication BMS method has low power consumption, strong scalability, and moderate cost. At the same time, the wireless communication method can reduce the wiring harness in the package, simplify the Pack structure, increase the energy density of the entire package, and eliminate the need for master-slave boards. High voltage risk, safer than CAN communication and daisy chain communication, is considered by the industry to be the development direction of future battery management systems.

　　Judging from the two cooperative companies participating in the layout this time, it also has certain typical significance.

　　Honeycomb Energy was invested and established by Great Wall Motors in February last year. It is a new energy company engaged in the research and development, production, sales and raw material production of automotive power batteries. In October last year, Great Wall Motors sold Honeycomb Energy to Baoding, a sister company of its controlling shareholder, for 790 million yuan. Ruimao. This also means that Honeycomb Energy becomes a company of the same level as Great Wall Motors.

　　Although according to Great Wall Motor's plan, Honeycomb Energy will conduct independent and market-oriented battery business operations in the future. But there is no doubt that it is still of great significance to Great Wall Motor's technology development and reserves in the battery field.

　　Sensata Technology is a representative in the field of sensor and controller design and manufacturing. The sensors and electrical protectors it produces are widely used in many fields such as automobiles, HVAC equipment, household appliances, special equipment and industrial equipment. field.

　　According to external statements from both parties, this cooperation will promote the application of wireless communication technology in battery management systems, and will use their respective advantages to conduct in-depth cooperation in customer resource sharing, integrated development, and cost reduction. The signal this sends is that the cooperation between the two companies is bound to accelerate the industrialization process of wireless communication BMS.

　　Wireless BMS moves towards commercialization

　　In fact, long before Honeycomb Energy cooperated with Sensata, the technology related to wireless communication BMS had already begun to "rapidly" move towards the commercialization stage.

　　In this BMW i3 concept car, the LTC6811 used by Linear Technology is a complete battery measurement device for hybrid/electric vehicles. It can measure the voltage of up to 12 series-connected batteries and has an accuracy better than 0.04 % accuracy. The combination with SmartMesh wireless mesh network system can solve the long-standing reliability problems caused by automotive wiring harnesses and connectors.

　　Later, in March 2017, a British BMS company called Dukosi announced that it had raised 2 million pounds for product development of wireless BMS technology. The company is also focusing on collecting, processing and storing data directly from the battery core, and transmitting the data to the PACK level in real time to reduce the complexity of the PACK and improve the measurement accuracy. Its downstream PACK enterprise customers and OEM customers are very interested in adopting this technology.

　　In China, there are also companies that are commercializing wireless BMS products, and Lifan's Wireless Oasis is one of them.

　　Gaogong Lithium Battery learned that the battery packaging and battery management system used in Lifan's Panda cars are produced by Wireless Oasis. In its battery system, Wireless Oasis is equipped with a wireless communication BMS.

　　According to reports, through the wireless BMS system, the battery status is transmitted to the vehicle's main communication system in real time, which can be displayed on the vehicle's instrument, or the information can be transmitted to the vehicle's operation background through the cloud data platform. The communication system on the entire vehicle uses frequency hopping technology to ensure the stability of communication.

　　There is no doubt that wireless BMS technology can greatly improve the reliability and accuracy of cell management, improve the efficiency of PACK assembly, reduce the technical complexity and overall cost of PACK, and provide better intelligent management solutions in the future. Therefore, the industry judges that its future has great business prospects.

　　The basis of BMS is to understand the status of the car battery through the measurement of voltage, current, and temperature. OEMs are becoming more and more sensitive to lightweighting and cost reduction of power batteries, and this naturally makes wireless BMS technology faster. Commercialization opportunities. Industry analysts point out that the advantages of wireless BMS technology are becoming more and more prominent

　　More reliable and simpler: Whether it is the CAN bus or the isoSPI bus, the battery monitoring chips are connected in series using a daisy chain. Once there is a connection problem somewhere, the entire system will be paralyzed. The wireless communication BMS can reduce the risk of connector failure: a single point of failure has limited impact on the overall situation. And it is also more flexible for adding and deleting new nodes in the network.

　　Smarter: The wireless connection solution makes the placement of the battery pack more flexible and has better scalability. More sensors such as temperature and current can be easily added according to application requirements. It also has time synchronization in harsh environments. The advantages''

　　Lightweight and cost reduction: The wireless solution allows each vehicle to save 10m of wires and 0.5kg of connectors and phase converters. Therefore, for every 50,000 vehicles produced, 500km of wires and 25,000kg of connectors and phase converters will be saved. While saving costs, it also meets the trend of lightweight vehicles; at the same time, the wireless method reduces assembly costs. In the future, silicon wafers will be cheaper than wires and connectors, and the total BMS cost will be lower.

　　Reduce PACK complexity: On the one hand, the use of wireless reduces the cost and weight of low-voltage wiring harnesses. On the other hand, it also makes the module more independent, making it more convenient for system integration, manufacturing, and even echelon utilization.

　　However, it is worth noting that the cost of wireless BMS chips and the electromagnetic compatibility of packs are challenges that need to be solved during commercialization.

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