As a key component of the new energy vehicle battery system, BMS is
responsible for the two major tasks of battery detection and battery safety
assurance. It monitors and adjusts the usage of the battery pack in real time to
ensure the safety of the entire vehicle.
However, due to low entry barriers and imperfect industry technology and
safety standards, some domestic BMS products currently have problems such as
uneven quality, missing functions, low accuracy, and poor safety, which have
plagued the industry's progress.
At the 2018 China International Automobile Trade Fair on October 15, Suzhou
Zhengli NIO New Energy Technology Co., Ltd. (referred to as "Zhengli NIO")
launched a new generation of BMS products for the high-end passenger car market
- Z-BMS. . It is understood that this product is built in strict accordance with
the ISO26262ASILC grade standard and can meet the functional safety needs of
most automobile manufacturers for automotive electronics.
Zhou Nan, executive vice president of Zhengli Weilai, told Gaogong Lithium
Battery that the company's Z-BMS products have been entrusted to TÜV Rheinland
for testing and certification. The company is confident that it can obtain
ISO26262ASILC issued by TÜV Rheinland before mass production in the first
quarter of next year. Certificate.
In fact, Zhengli Weilai, founded in December 2016, is considered a "new
face" in the domestic BMS field, but why is its new generation product Z-BMS
able to achieve high technical standards and strong capabilities in a short
period of time? market competitiveness?
According to reports, Z-BMS is a fifth-generation battery management system
jointly developed by Zhengli Weilai and Lithium Balance specifically for the
Chinese market. The main research team of Lithium Balance is from the Technical
University of Denmark. It is a senior development company with ten years of BMS
development experience in Europe. It has developed more than 150 projects in 32
regions around the world and has strong development capabilities. In 2017,
Zenlead, the controlling shareholder of Zhengli Weilai, officially invested in
Lithium Balance, aiming to integrate European and Chinese technologies and
jointly develop China's new energy passenger vehicle market.
Market attack supported by technology/resources
Under the halo of the genes of an international technical team, Z-BMS has
the dual blessing of international leading technology and domestic and foreign
supply chain resources from the beginning of research and development. While
maintaining technological advancement, the product's cost and price also show
high market competitiveness.
Lithium Balance CEO Lars Barkler said in an interview that compared with
ordinary BMS products, Z-BMS has two major features: hardware and software. In
terms of hardware, the company strictly follows the functional safety process
and requirements for development and testing to ensure that the product reaches
the ISO26262ASILC level standard when the product is officially mass-produced in
April next year; the hardware has a service life of up to 15 years; the
balancing current is large to ensure battery consistency. Thereby extending the
battery life; the main chip is a TI32bit dual-core microcontroller, and the
sampling chip uses LTC6811, both of which comply with functional safety level
D.
In terms of software, the product is developed based on the Matlab model,
which is close to the efficiency of manual code execution. The software
development process complies with ASPICE standards and can detect up to 300
faults.
On this basis, Z-BMS performance data is extremely impressive. The actual
measurement error of SOC estimation accuracy is less than 5%, the current
detection accuracy is as low as 0.25%; the total voltage detection accuracy is
as low as 0.25%; the temperature detection accuracy reaches ±1°C; the single
unit detection accuracy reaches ±1.5mV...
"At the same time, according to customers' different product data and
customer requirements, the company can also develop and design through two sets
of algorithms, one is ampere-hour integral + OCV + error verification algorithm,
and the other is based on the battery chemical model + EKF algorithm . Maximize
the error correction performance and detection performance of the product, and
reduce the SOC estimation accuracy error." Wang Zhigang, BMS development manager
of Zhengli Weilai, introduced.
As subsidies in the domestic new energy vehicle market decline, pressure to
reduce costs is transmitted upward. As a key component of power batteries, cost
reduction has naturally become the main theme of the BMS industry. How to
balance the leverage between product quality and cost has also become an urgent
problem for manufacturers to solve.
Lars Barkler said that the company has made sufficient preparations in
terms of cost reduction: 1. The company has used one and a half years to realize
the platformization of BMS hardware and software, significantly reducing the
development cost and time cost of subsequent new products. ; 2. More than ten
years of roots in the BMS field have allowed the company to have many strategic
partners in the global automotive electronics supply chain, which can ensure a
stable supply of spare parts materials and reduce procurement costs; 3. The
company's BMS products are developed around the new communication standard
isoSPI development to ensure its economy and good development prospects in the
market.
"In addition, the company's main research team is also cooperating with new
battery materials to develop BMS applications, keeping the company's technical
level at the forefront of advancing with the times for a long time." Lars
Barkler emphasized.
Comprehensive BMS/PACK/battery cell technology
In fact, Zhengli NIO’s “ambition” for China’s new energy vehicle market
goes beyond BMS. It has also completely failed in the field of PACK and battery
cells.
It is understood that Zhengli NIO is a joint venture established by Zenlead
and Weiran (Nanjing) Energy Storage Technology Co., Ltd., a wholly-owned
subsidiary of NIO. Zhengli Weilai is positioned as a professional battery pack
R&D and manufacturing enterprise integrating design and development, trial
production testing, and production and manufacturing, of which Zenlead holds a
65% controlling stake.
Zhou Nan said that following the Internet thinking, NIO and Zenlead had
already signed an agreement when they cooperated, which did not restrict the
joint venture company to only provide NIO with battery packs. This means that on
the premise of ensuring the supply of NIO's production capacity, the joint
venture The company is able to design and produce battery packs for vehicle
manufacturers across the country.
It is understood that in addition to establishing a joint venture with NIO,
Zhengli NIO has also negotiated different models of cooperation intentions with
automakers such as AIWAYS, Hanteng Automobile, and Qoros Automobile. At the same
time, Zhengli Weilai's affiliated companies have cooperated with Toyota. With
the integration of excellent resources, Zhengli Weilai's manufacturing site has
also formed a Japanese management style and achieved comprehensive TPS lean
production.
Currently, due to the need to control core technologies and reduce costs,
battery manufacturers and vehicle manufacturers are deploying the PACK market
through self-development or acquisitions. Therefore, the living space of
third-party PACK companies has been compressed. As a "rising star" in the PACK
family, Zhengli Weilai has a very clear idea of its offensive line in the future
market.
The first is to enter into joint ventures with vehicle manufacturers and
use the power of new vehicle manufacturers as a market breakthrough. Take the
cooperation with NIO as an example. NIO leads the design of battery products and
processes, while Zhengli NIO is responsible for the installation of the
production line and the development of the process.
Second, Zhengli Weilai controls the design and development of the PACK
process, and vehicle customers will find suppliers for trial production. In
addition to providing satisfactory design solutions, Zhengli Weilai will also
cooperate with the vehicle manufacturers until the model is mass-produced.
The third is joint development with the vehicle manufacturer. The vehicle
manufacturer proposes product requirements, and Zhengli NIO cooperates in
development, supply selection and trial production. After approval, Zhengli NIO
is responsible for production.
Zhou Nan revealed that Zhengli Weilai has already formed a PACK production
capacity of 38,000 units and is currently expanding production. It is expected
to achieve mass production in the first quarter of next year. The new production
line will be built into a benchmark product with flexibility and intelligence.
Wire.
It is worth mentioning that Zhengli Weilai is also actively involved in
battery anode technology and hopes to cooperate with vehicle
manufacturers/battery manufacturers through equity participation, technology
licensing, etc. Through advanced pre-lithium technology and medium and high
nickel cathode materials, a high-energy-density battery core with an energy
density of over 300Wh/kg is created.
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