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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