On June 14, 2019, a lecture themed on "Unlocking the Safety Performance of
Qiantu Motor's Batteries" was held at Qiantuyi Beijing Sanlitun Store. Focusing
on the power battery safety issue that consumers are most concerned about at the
moment, Qiantu Motor's three-power technical expert and general manager of Huate
Business Department Manager Mr. Zhai Sheng shared Qiantu Motor's complete
technical development path for power batteries on site, as well as technical
solutions for battery safety performance.
Safety first, forward thinking
Recently, spontaneous combustion accidents of electric vehicles have
occurred frequently at home and abroad, causing consumers who are currently
paying attention to new energy vehicles to raise serious doubts about the safety
of electric vehicle power batteries. Measures such as limiting charging to 90%
and updating the battery management system (BMS) have not dispelled these
doubts. And how to reduce the risk of spontaneous combustion of electric vehicle
power batteries to a lower level? This is the core content of this theme
lecture.
Qiantu Motor's forward-looking exploration of automotive power batteries
began in 2010. Deeply explore the development path of battery technology, and
finally establish a technical route based on standard boxes of soft-packed
batteries. Zhai Sheng mentioned: "As a vehicle developer, the safety and
consistency of batteries are our first core issues to consider." Based on this
goal, Qiantu Motor abandoned the cylindrical and square single cells that were
the mainstream in the market at that time, and adopted soft-pack batteries that
are safer and have obvious advantages in buffering and releasing runaway
energy.
From the perspective of packaging, soft-pack batteries are packaged in
aluminum-plastic film. When the uncontrolled energy inside it accumulates and
reaches the explosive point, it will be slowly released through the soft shell
instead of uncontrollably exploding. The heat energy generated by the
millisecond-level electrochemical reaction is converted into a controllable
battery outer packaging deformation of more than ten seconds, thereby achieving
the uncontrolled energy release mentioned above. It also provides drivers and
passengers with more ample reaction and escape time after the vehicle alarms,
thereby giving the vehicle a higher safety advantage and making soft-pack
batteries the cornerstone of Qiantu Motor's overall power battery
technology.
Battery standard box provides double insurance for safety
After the safety foundation of the single battery was completed, Qiantu
Motor adopted a design method that simultaneously focused on the safety of the
overall battery module and pioneered the development of a standard battery box
module structure. Inside the Qiantu standard battery box, the dynamic space of
the battery cells is filled with foam. This material can absorb the size changes
of the battery cells caused by the breathing effect of the battery cells, and
plays an internal buffering role in the event of collisions, strong bumps, etc.
. The battery box shell is made of high-strength composite materials, making its
crash performance test score 30% higher than the national standard and meeting
the IP67 waterproof and dustproof rating. It is worth mentioning that the sealed
shell of the standard battery box can also efficiently cooperate with the
battery thermal management system to ensure the consistency of the battery core
temperature and ensure battery safety in all aspects.
In addition, each single standard battery box of Qiantu Motor is equipped
with an independent thermal management system and an independent battery
management system, which not only provides stronger heat dissipation performance
and structural strength for the standard battery box, but also effectively
realizes intelligent management of battery cells and real-time Monitor the
status of the ten battery boxes throughout the vehicle's entire life cycle.
RESS builds a multi-dimensional battery safety prevention and control
system
"RESS is like the dynamic energy regulation system of the human body." "We
regard each battery cell as a living body." Mr. Zhai Sheng said when explaining
the RESS system. Relying on high-security standard battery box packs, Qiantu
Motor has developed an efficient thermal management system and a sophisticated
and intelligent battery management system. The two together form a comprehensive
safety performance solution for the vehicle's RESS rechargeable energy storage
system. The RESS system uses an active liquid cooling/liquid heating thermal
management system to ensure that each standard battery box can receive
sufficient heat exchange, minimize the temperature difference between cells,
effectively improve temperature consistency, and ensure the full temperature of
the vehicle (- Driving safely within the range of 30℃～55℃). At the same time, in
order to fully meet the reliability and durability of the battery system, Qiantu
Motor uses a more sophisticated and intelligent battery management system (BMS)
to perform multiple functions on the battery status, including detection,
monitoring, safety protection, charging management, etc. Comprehensive
monitoring provides efficient data support for battery diagnosis, improves
diagnosis efficiency, maximizes the safety performance of the battery system
during operation, and extends the battery life.
At the same time, the industry's original water chamber design and the
synergy with RESS also make the Qiantu standard battery box even more powerful.
According to Mr. Zhai Sheng, other manufacturers’ water-cooled power batteries
for vehicles in the industry are all water-cooled, making it difficult to ensure
the battery’s all-round temperature consistency. Qiantu's unique water chamber
design allows the side of each battery cell to have sufficient contact area with
the coolant, thereby ensuring the temperature consistency of all battery cells,
and fundamentally eliminating the risk of spontaneous combustion of the battery
due to thermal runaway. down to a lower limit.
Independently designed and built a high-consistency battery system
In order to ensure the consistency of battery products, Qiantu Motor built
its own factory and independently designed industry-leading production lines to
develop the entire battery system. It uses strict production, inspection and
process standards to ensure product consistency and excellent quality. At the
same time, Qiantu also extended its supervision system to raw material
suppliers, and proposed that the electrolyte, metal particle raw materials, and
positive and negative electrode materials required for the battery core in the
same standard box system must be assembled from the same manufacturer and the
same batch to avoid The differences in battery cell internal resistance and
capacity caused by small differences in raw materials ensure a high degree of
battery consistency from the source, thereby locking in product quality.
Postscript
Through Mr. Zhai Sheng's explanation, we can get a glimpse of Qiantu
Motor's design and manufacturing philosophy. Since the beginning of car
manufacturing, Qiantu Motor has taken safety as the first consideration in
design. And through groundbreaking technical ideas and practices, the high
safety of power battery systems is achieved. It is reported that in the future,
Qiantu Motor will rely on its more than ten years of technical heritage in the
power battery field to further explore comprehensive battery technology
solutions and continue to provide consumers with pure electric vehicles with
higher comprehensive performance and superior safety. Qiantu Motor's power
battery design example not only effectively improves its own product safety, but
also provides a successful example for other companies in the industry, which
may lead to further improvements in product safety in the same industry.
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