On July 10, the "First China International Electric Vehicle Safety
Technology Innovation Conference" with the theme of "Breaking through and
Transforming the Safety of Electric Vehicle Development" was held in Baoding,
Hebei.
At the meeting, Liu Yanlong, Secretary General of China Chemical and
Physical Power Source Industry Association, Yu Qingjiao, Secretary General of
Zhongguancun New Battery Technology Innovation Alliance, Mo Ke, founder of True
Lithium Research, Tang Haifeng, Vice President of Great Wall Motors and Chairman
of Honeycomb Group, Yang Hongxin, General Manager of Honeycomb Energy, Deputy
General Manager Rao Zhongru and others jointly released the "White Paper on the
Development of China's Automotive Grade Power High-speed Laminated Batteries".
This is the world's first laminated battery application white paper, which
comprehensively sorts out the development history and technical characteristics
of power batteries, points out a safe way for future development of
automotive-grade power batteries, and helps promote a new round of power battery
process technology innovation.
The world's first lamination process white paper was released in Baoding,
refreshing automotive grade power battery standards
The world’s first laminated battery application white paper is released
The development of power lithium batteries in my country started in the
21st century. The 50 lithium-ion battery buses used in the 2008 Beijing Olympics
set a precedent for the industrialization of lithium-ion batteries.
After more than ten years of rapid development, power lithium batteries
have now reached a crossroads. On the one hand, new energy vehicles have a huge
demand for power lithium batteries; on the other hand, power lithium batteries
are facing a series of challenges such as subsidy reduction, "white list"
cancellation, frequent safety accidents, etc. The power battery industry chain
urgently needs to form a more comprehensive Close cooperation.
In order to further implement the innovation-driven development strategy
and accelerate the high-quality development of the lithium battery industry,
relevant institutions of industry, academia and research in the power battery
industry jointly launched the world's first white paper on the application of
laminated batteries - "White Paper on the Development of China's Automotive
Grade Power High-speed laminated batteries".
The world's first lamination process white paper was released in Baoding,
refreshing automotive grade power battery standards
This white paper comprehensively summarizes the current development status
of global lithium battery production technology, from the development of
lithium-ion battery production equipment, the process differences and quality
control of winding and lamination, the development path of technology and
equipment in the lamination era, the performance advantages and performance
advantages of batteries in the lamination era. Several sections such as safety
improvement introduce the latest progress and future trends of high-speed
lamination process.
In the current industrial context, the release of this white paper, on the
one hand, through a longitudinal review of the evolution of lithium battery
technology, points out to the industry that the stacking era is the only way
forward for power battery process innovation; on the other hand, through a
horizontal comparison of the lamination process and winding The differences in
processes put forward the safety, endurance, life, size, capacity, price and
other conditions that car-grade batteries need to meet, thus providing clear
standard guidance for manufacturing process innovation for all parties in the
battery industry chain.
What did we read in the lamination process white paper?
In recent years, energy storage white papers, power battery white papers,
etc. have been released in the power battery industry. What is different about
this high-speed lamination process white paper? What step has the technological
progress of the lamination process taken now?
In this "White Paper on the Development of China's Automotive Grade Power
High-speed Laminated Batteries", we can see the following differences.
1. Division of three stages of lithium-ion battery development
The white paper spends a lot of space to comprehensively sort out the
lithium battery from the 1.0 era of 3C-level applications, to the 2.0 era of
ordinary power applications, and now to the 3.0 era of automotive-level power
applications, and the corresponding battery cells at each stage. morphological
changes and the manufacturing processes of mainstream manufacturers.
The world's first lamination process white paper was released in Baoding,
refreshing automotive grade power battery standards
The first two stages are mainly based on the winding process. In the
battery 3.0 era, the design of new energy vehicle battery packs is developing in
the direction of longer length, and the height direction is unified at around
100mm. Therefore, batteries produced by the lamination process will be widely
used.
2. Process differences and quality control of winding and lamination
The biggest process difference between square laminated batteries and
coiled batteries lies in the three major processes of slitting, die-cutting and
pole assembly forming. The processing methods of other processes are the same.
The biggest difference lies in the pole assembly forming method.
First of all, the positive and negative electrode sheets in the winding
process are continuous, and the positive and negative electrode sheets in the
lamination process are in the form of sheets; secondly, in the winding process,
when the mark hole on the pole piece is detected, it is cut at the mark hole
position to complete a pole set. The laminated battery cells are laminated
according to the set number of positive and negative electrode sheets. When the
number reaches the set value, the lamination of one battery cell is completed;
finally, there are differences in the shape of the formed electrode groups. The
pole group of the winding process, with the same number of layers, has twice the
number of tabs than the laminated battery. In terms of quality control, the
requirements for burr and dust control of laminated batteries are higher.
3. Development and performance advantages of technology and equipment in
the stacking era
The white paper introduces the current three directions of lamination
equipment: ① high-speed lamination equipment route; ② cutting and stacking
integrated machine; ③ thermal lamination high-speed lamination equipment. The
first type of technology has high flexibility and feasibility and is in the
development stage; the second type is not yet mature for application due to the
difference in efficiency matching between the die-cutting machine and the
lamination machine; the third type is due to the patented thermal composite
lamination process. Protection limits the promotion and application within the
industry.
The world's first lamination process white paper was released in Baoding,
refreshing automotive grade power battery standards
Honeycomb Energy adopts the square aluminum shell lamination process,
chooses the industry-leading high-speed lamination route for equipment
technology, and hires domestic and foreign senior lamination equipment and
process experts to achieve technological achievements in the field of high-speed
lamination. Stack-era batteries not only have higher energy density and more
stable internal structure, but also have higher safety and longer cycle
life.
For safety, refresh the car-grade power battery standards
According to incomplete statistics, since April 2019, at least 6 new energy
vehicle fires have occurred. Although the causes of fires vary, some are
charging, some are being repaired, and some spontaneously ignite while standing
still... The series of accidents has not only caused people to worry about the
safety of electric vehicles, but also caused harm to the development of the
industry. adverse effects.
In this regard, Wan Gang, Vice Chairman of the National Committee of the
Chinese People's Political Consultative Conference and Chairman of the China
Association for Science and Technology, pointed out: "Faced with the
superposition of various new safety issues, it is necessary to formulate new
technical standards and safety standards, especially to establish system-wide
solutions. At the same time, further improve Product quality, improve
consistency and reliability in the design, manufacturing, assembly and other
aspects of power batteries.”
The release of the "White Paper on the Development of China's Automotive
Grade Power High-speed Laminated Batteries" provides solutions on how to build
safe and reliable automotive grade power batteries, and proposes power lithium
battery standards that ensure safety from the selection of technical paths. From
the joint release of this white paper, we saw a joint appeal from industry,
academia and research parties.
The conference brought together Xu Yanhua, deputy secretary-general of the
China Automobile Association, Fu Bingfeng, executive vice president and
secretary-general of the China Automobile Association, Billy Xu, representative
of SAE International, Yang Yusheng, an academician of the Chinese Academy of
Sciences, Liu Yanlong, secretary-general of the China Chemical and Physical
Power Supply Industry Association, China Dynamics Deputy Secretary-General of
the Battery Innovation Alliance & Deputy Secretary-General of the China
Electric Vehicle Charging Infrastructure Charging Alliance Wang Zidong, founder
of True Lithium Research Mo Ke, Director of the State Key Laboratory of Safety
and Energy Conservation at Tsinghua University Professor Lu Languang, China New
Energy Materials Technology Research Institute Professor Chang Wang Qingsheng
and many other industry experts have worked together to improve the safety and
quality of global electric vehicles.
As the core component of electric vehicles, power batteries are not only
related to the competitiveness of OEM electric vehicle products, but also
closely related to consumers' driving safety. In this regard, Yang Yusheng, an
academician of the Chinese Academy of Engineering, emphasized at the meeting:
"We must use mature and safe batteries to develop safe, energy-saving and
emission-reducing electric vehicles."
Regarding the next generation of automotive-grade power batteries, Lu
Languang, director of the State Key Laboratory of Safety and Energy Conservation
at Tsinghua University, said bluntly: "The advantages of the winding process are
high production efficiency and controllable inter-layer clamping force. However,
due to the curvature radius, especially the winding core The internal center
curvature radius is small, resulting in small N/P, uneven charging and
discharging stress, inconsistent deformation, and easy lithium precipitation.
The lamination process is just the opposite. Each part is evenly stressed and
not easy to deform. Lamination is more suitable for deformation. Larger
electrode materials help ensure consistent deformation during charge and
discharge cycles and avoid problems such as lithium precipitation."
Power battery safety is not just talk. The world's first lamination process
application white paper was released at the first China International Electric
Vehicle Safety Technology Innovation Conference, marking the first step for
Chinese companies to take the first step in the safety of power lithium battery
system solutions. Let the world realize the safety and reliability of high-speed
stacking, enhance trust in square stacked batteries, and then promote the
industry to stride forward in a more stable "stacking era".
The world's first lamination process white paper was released in Baoding,
refreshing automotive grade power battery standards
It is understood that new and old forces in the lithium battery industry
such as CATL, Panasonic, Samsung SDI, Funeng Technology, Wanxiang A123, and
Micromacro Power have plans to introduce the lamination process after 2022.
Honeycomb Energy, a new force in power batteries, took the lead in releasing its
first car-grade square stacked battery on April 10 this year, entering the
"stack era" three years ahead of the world's mainstream manufacturers.
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