Recently, the National Development and Reform Commission issued the
"Automotive Industry Investment Management Regulations", canceling the
requirement that "the specific energy of energy-type vehicle power batteries
should not be less than 300Wh/kg, and the system specific energy should not be
less than 220Wh/kg." An obvious trend is that the pursuit of energy density at
the policy level is becoming more rational and realistic.
However, high safety, long battery life, and long life are still the core
needs of the market. Therefore, under the pressure of market orientation and
competition, power battery companies have continued to pursue research and
development to improve energy density while taking into account the safety,
cycle life and cost of power batteries.
On the afternoon of the 19th, at the "Passenger Cars and Three Electrics
Special" sponsored by Guoxuan Hi-Tech, Dr. Cao Hui, Chairman of Ruipu Energy
Co., Ltd. (hereinafter referred to as "Ruipu Energy"), delivered a speech on
"The Key to the Safety Design of High-Specific Energy Batteries" Technology"
wonderful keynote speech.
Dr. Cao Hui said that high-specific energy power batteries face more safety
challenges, including safety hazards caused by manufacturing defects; effective
early warning of thermal runaway; safety hazards and accidents caused by
charging; full life cycle safety assessment; thermal runaway induction and
spread suppression technology, etc.
In response to this, the solution provided by Ruipu Energy is to start from
the four major aspects of cell material selection, pole core design, cell
process technology, and cell process environment.
In terms of battery core material selection, Ripu Energy has extremely high
requirements for the selection of positive active materials and ceramic
separators, the configuration of functional and safe electrolytes, and the
selection of negative electrode materials and interface characteristics,
including high-quality Design of safety shell cover structure.
In terms of pole core design, the company independently developed a
solid-state pole core design; it paid attention to the rationality of the design
size of the positive and negative pole pieces and the alignment of the positive
and negative pole pieces in the pole core, and at the same time strengthened the
reliability of the welding of the pole tabs and cover plates.
In terms of the cell manufacturing process, we strictly control burrs and
dust; predict and control the impact of the process on the interface; the impact
of laser welding on battery safety; eliminate the introduction of foreign matter
during the entire process; and strengthen the laser welding strength of the
shell cover.
In terms of battery cell manufacturing environment, a humidity control
environment of less than 2% is maintained; dust is strictly controlled
throughout the entire process.
At present, Ruipu Energy's 7914897 square battery adopts a ternary system,
with a nominal capacity of 155Ah, an energy density of 220Wh/kg, and a cycle
life of more than 2,000 times.
Regarding the 2019 vehicle battery plan, Cao Hui revealed that Ruipu’s
ternary system monomer cycle life will reach more than 2,000 times; the module
cycle will exceed 1,500 times; the lithium iron phosphate system monomer cycle
life will exceed 4,000 times; 45-degree cycle More than 2500 times; meets the
three typical temperature charge and discharge cycle requirements of
-10°C/25°C/45°C.
It is understood that Ruipu Energy is a subsidiary established by Tsingshan
Group with an investment of 1.73 billion in 2017. Tsingshan Group is currently
the world's largest stainless steel and iron-nickel manufacturer. Measured in
terms of metallic nickel, the output of nickel products in 2017 ranked second in
the world. In 2017, Tsingshan Group's operating income reached 161.5 billion
yuan, ranking 110th among the Top 500 Chinese Enterprises in 2018 and 23rd among
the Top 500 Chinese Private Enterprises in 2018. In 2018, private enterprises in
Zhejiang Province ranked third, second only to Geely Holding and Haidian
Group.
Ruipu Energy is mainly engaged in the R&D, production and manufacturing
of new energy vehicle power batteries and grid energy storage batteries,
covering two technical routes: ternary and lithium iron phosphate. Currently it
has a Wenzhou manufacturing base and a Shanghai R&D center.
In terms of production capacity, the company's first-phase project
production capacity is planned to be 3GWh. The civil construction of the
100,000-square-meter factory building has been completed. It entered trial
production in October 2018 and was officially put into production at the end of
November. The company plans to add 5GWh of power battery production capacity in
the second phase of the project, and the project is expected to be completed and
put into production in 2020. By then, the company is expected to have a total
production capacity of 8GWh.
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