As one of the leading companies with independent brands, Dongfeng Motor Group officially announced its new energy high-end brand Lantu in 2020. Among them, the Lantu FREE, the first mass-produced model under the Lantu brand, will be officially delivered in the third quarter of 2021. As the launch time approaches, the detailed technical details of Lantu FREE have also been officially released.
Interpretation of Lantu FREE battery safety technology for new energy vehicles
Recently, Lantu Motors held a ternary lithium-ion battery safety technology sharing meeting, which showed the public for the first time the safety technology and safety test information of Lantu FREE (pure electric version) battery packs, car body structure and electrical systems.
Interpretation of Lantu FREE battery safety technology for new energy vehicles
Lantu FREE pure electric version adopts ternary lithium-ion battery, its physical characteristics have the characteristics of high energy density, good low temperature performance and good rate characteristics. However, correspondingly, due to the high electrochemical activity of ternary lithium-ion batteries, compared with lithium iron phosphate batteries, they have higher safety protection and thermal management requirements. To achieve a balance between high performance and high safety, battery technology and research and development It has great challenges and is recognized as a pain point in the industry.
In order to overcome this industry problem, Lantu has invested huge research and development efforts on the safety of batteries and electrical systems, and achieved three major technical advantages in the mass production of batteries, including "three-dimensional insulation wall" technology and BMS original battery safety monitoring And early warning model and high-safety battery PACK program.
-"Three-dimensional Insulation Wall" Technology
As we all know, the inside of the power battery pack is composed of a large number of cells. In extreme cases, the thermal runaway of a single battery cell is likely to spread to the surrounding battery cells, causing a chain reaction, causing the entire battery pack to smoke or even catch fire and explode. In order to solve this problem, Lantu FREE's battery pack uses the industry's first "three-dimensional insulation wall" technology.
Interpretation of Lantu FREE battery safety technology for new energy vehicles
When a battery cell is thermally out of control, the "three-dimensional insulation wall" can ensure that the energy released by it is minimized, avoiding other cells around it, and thereby preventing thermal runaway in the battery pack system. On the top of the battery cell, an additional heat-insulating and flame-retardant layer resistant to high temperatures exceeding 1000°C is also arranged to strictly protect the safety of the passenger compartment.
Interpretation of Lantu FREE battery safety technology for new energy vehicles
On the other hand, the heat-insulating and flame-retardant protective layer also needs to consider the heat dissipation of the battery. In this regard, Lantu FREE uses small-sized batteries, which have inherent advantages in terms of heat dissipation performance. At the same time, the bottom of each battery cell is in contact with a high-efficiency liquid cooling system to maintain a stable heat dissipation capacity of the battery pack.
-High-safety battery PACK solution
Interpretation of Lantu FREE battery safety technology for new energy vehicles
In fact, whether it is a new energy vehicle or a traditional fuel vehicle, the safety structure of the vehicle body is a very important technology. Reasonable front and rear body energy-absorbing structure and rigid-strength passenger compartment structure are common basic structure technologies. However, compared with traditional fuel vehicles, the biggest threat to the battery system of new energy vehicles usually comes from the side of the body.
Therefore, the B-pillar structure of Lantu FREE uses TRB process 1500Mpa ultra-high-strength steel; in the door sill position, double-layer structure 1500MPa ultra-high-strength hot-formed steel is used; inside the front and rear doors, 2000MPa hot-formed Steel door anti-collision beams. These structures have built the first line of defense for Lantu FREE.
Interpretation of Lantu FREE battery safety technology for new energy vehicles
Inside the battery pack, through the horizontal and vertical interlaced three-dimensional structure that penetrates the entire battery pack, the collision energy from the outside is fully decomposed and absorbed, and the internal batteries are protected from the collision force.
Interpretation of Lantu FREE battery safety technology for new energy vehicles
As the "last line of defense", Lantu FREE's battery pack uses cylindrical cells with aluminum alloy shells, and both poles are equipped with explosion-proof valves. When the impact intrudes into the battery pack and causes a short circuit of the high-voltage circuit, the battery is bipolar and double insurance Open to ensure that the battery does not catch fire or explode.
-BMS Cloud Guard's original battery safety monitoring and early warning model
In addition to the active and passive safety technologies at the hardware level, Lantu FREE has also innovated at the software level. As the software core of new energy vehicles, BMS plays a decisive role in battery performance, thermal management, and charging and discharging, which naturally also includes safety performance.
Based on the original temperature and voltage warning, Lantu FREE has built an accurate battery safety monitoring and warning big data model, based on different use scenarios (such as plains and mountains, north and south temperature and humidity, high and low altitude day and night temperature difference, etc.), tracking each The usage data of the trolley and each battery.
Interpretation of Lantu FREE battery safety technology for new energy vehicles
The system compares the large cloud database with the monitoring data to perform diagnosis, early warning, and life monitoring of the battery. When the system finds that the battery monitoring data is abnormal, it will push the cloud APP and the vehicle's early warning system to give early warning to the user. At the same time, the system uses high-sensitivity temperature detection sensors to monitor the temperature of each battery in real time. With the help of a high-efficiency liquid cooling system, the battery pack is always in a high-efficiency temperature range regardless of winter and summer.
Interpretation of Lantu FREE battery safety technology for new energy vehicles
Previously, Lantu FREE passed the safety test of the power battery of the China Automobile Center. After the battery pack was triggered by a thermal runaway and issued a thermal event alarm signal, the battery "no smoke, no fire, no explosion". Through a series of comprehensive safety protection design and technical application, the battery pack carried by Lantu FREE realizes the first ternary lithium battery in China that has achieved "non-smoke" results.
Interpretation of Lantu FREE battery safety technology for new energy vehicles
In the thermal diffusion test conducted by China Automobile Research Institute in accordance with the requirements of the new national standard, the battery pack used by Lantu FREE started the test under 100% SoC state and normal operating temperature. A certain battery cell in the battery pack passed the test. The heating device is heated to 300°C until thermal runaway occurs.
Five minutes after the test triggered the thermal runaway, the battery pack system of Lantu FREE showed no smoke, fire, or explosion (national standard requirement: no fire in 5 minutes); during the test, the maximum temperature reached by the battery cell was about 300℃. After 10 minutes, the temperature drops to 50°C; the entire battery pack shell is intact. After disassembling the shell, only the test cell is damaged, and the surrounding cells are not affected; the battery pack after the test is left standing for observation for 50 days and still maintains “no "Smoke, no fire, no explosion" state.
Summary of the full text The first step to a successful establishment of stringent safety standards
Interpretation of Lantu FREE battery safety technology for new energy vehicles
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Interpretation of Lantu FREE battery safety technology for new energy vehicles
Recently, Lantu Motors held a ternary lithium-ion battery safety technology sharing meeting, which showed the public for the first time the safety technology and safety test information of Lantu FREE (pure electric version) battery packs, car body structure and electrical systems.
Interpretation of Lantu FREE battery safety technology for new energy vehicles
Lantu FREE pure electric version adopts ternary lithium-ion battery, its physical characteristics have the characteristics of high energy density, good low temperature performance and good rate characteristics. However, correspondingly, due to the high electrochemical activity of ternary lithium-ion batteries, compared with lithium iron phosphate batteries, they have higher safety protection and thermal management requirements. To achieve a balance between high performance and high safety, battery technology and research and development It has great challenges and is recognized as a pain point in the industry.
In order to overcome this industry problem, Lantu has invested huge research and development efforts on the safety of batteries and electrical systems, and achieved three major technical advantages in the mass production of batteries, including "three-dimensional insulation wall" technology and BMS original battery safety monitoring And early warning model and high-safety battery PACK program.
-"Three-dimensional Insulation Wall" Technology
As we all know, the inside of the power battery pack is composed of a large number of cells. In extreme cases, the thermal runaway of a single battery cell is likely to spread to the surrounding battery cells, causing a chain reaction, causing the entire battery pack to smoke or even catch fire and explode. In order to solve this problem, Lantu FREE's battery pack uses the industry's first "three-dimensional insulation wall" technology.
Interpretation of Lantu FREE battery safety technology for new energy vehicles
When a battery cell is thermally out of control, the "three-dimensional insulation wall" can ensure that the energy released by it is minimized, avoiding other cells around it, and thereby preventing thermal runaway in the battery pack system. On the top of the battery cell, an additional heat-insulating and flame-retardant layer resistant to high temperatures exceeding 1000°C is also arranged to strictly protect the safety of the passenger compartment.
Interpretation of Lantu FREE battery safety technology for new energy vehicles
On the other hand, the heat-insulating and flame-retardant protective layer also needs to consider the heat dissipation of the battery. In this regard, Lantu FREE uses small-sized batteries, which have inherent advantages in terms of heat dissipation performance. At the same time, the bottom of each battery cell is in contact with a high-efficiency liquid cooling system to maintain a stable heat dissipation capacity of the battery pack.
-High-safety battery PACK solution
Interpretation of Lantu FREE battery safety technology for new energy vehicles
In fact, whether it is a new energy vehicle or a traditional fuel vehicle, the safety structure of the vehicle body is a very important technology. Reasonable front and rear body energy-absorbing structure and rigid-strength passenger compartment structure are common basic structure technologies. However, compared with traditional fuel vehicles, the biggest threat to the battery system of new energy vehicles usually comes from the side of the body.
Therefore, the B-pillar structure of Lantu FREE uses TRB process 1500Mpa ultra-high-strength steel; in the door sill position, double-layer structure 1500MPa ultra-high-strength hot-formed steel is used; inside the front and rear doors, 2000MPa hot-formed Steel door anti-collision beams. These structures have built the first line of defense for Lantu FREE.
Interpretation of Lantu FREE battery safety technology for new energy vehicles
Inside the battery pack, through the horizontal and vertical interlaced three-dimensional structure that penetrates the entire battery pack, the collision energy from the outside is fully decomposed and absorbed, and the internal batteries are protected from the collision force.
Interpretation of Lantu FREE battery safety technology for new energy vehicles
As the "last line of defense", Lantu FREE's battery pack uses cylindrical cells with aluminum alloy shells, and both poles are equipped with explosion-proof valves. When the impact intrudes into the battery pack and causes a short circuit of the high-voltage circuit, the battery is bipolar and double insurance Open to ensure that the battery does not catch fire or explode.
-BMS Cloud Guard's original battery safety monitoring and early warning model
In addition to the active and passive safety technologies at the hardware level, Lantu FREE has also innovated at the software level. As the software core of new energy vehicles, BMS plays a decisive role in battery performance, thermal management, and charging and discharging, which naturally also includes safety performance.
Based on the original temperature and voltage warning, Lantu FREE has built an accurate battery safety monitoring and warning big data model, based on different use scenarios (such as plains and mountains, north and south temperature and humidity, high and low altitude day and night temperature difference, etc.), tracking each The usage data of the trolley and each battery.
Interpretation of Lantu FREE battery safety technology for new energy vehicles
The system compares the large cloud database with the monitoring data to perform diagnosis, early warning, and life monitoring of the battery. When the system finds that the battery monitoring data is abnormal, it will push the cloud APP and the vehicle's early warning system to give early warning to the user. At the same time, the system uses high-sensitivity temperature detection sensors to monitor the temperature of each battery in real time. With the help of a high-efficiency liquid cooling system, the battery pack is always in a high-efficiency temperature range regardless of winter and summer.
Interpretation of Lantu FREE battery safety technology for new energy vehicles
Previously, Lantu FREE passed the safety test of the power battery of the China Automobile Center. After the battery pack was triggered by a thermal runaway and issued a thermal event alarm signal, the battery "no smoke, no fire, no explosion". Through a series of comprehensive safety protection design and technical application, the battery pack carried by Lantu FREE realizes the first ternary lithium battery in China that has achieved "non-smoke" results.
Interpretation of Lantu FREE battery safety technology for new energy vehicles
In the thermal diffusion test conducted by China Automobile Research Institute in accordance with the requirements of the new national standard, the battery pack used by Lantu FREE started the test under 100% SoC state and normal operating temperature. A certain battery cell in the battery pack passed the test. The heating device is heated to 300°C until thermal runaway occurs.
Five minutes after the test triggered the thermal runaway, the battery pack system of Lantu FREE showed no smoke, fire, or explosion (national standard requirement: no fire in 5 minutes); during the test, the maximum temperature reached by the battery cell was about 300℃. After 10 minutes, the temperature drops to 50°C; the entire battery pack shell is intact. After disassembling the shell, only the test cell is damaged, and the surrounding cells are not affected; the battery pack after the test is left standing for observation for 50 days and still maintains “no "Smoke, no fire, no explosion" state.
Summary of the full text The first step to a successful establishment of stringent safety standards
Interpretation of Lantu FREE battery safety technology for new energy vehicles
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From the perspective of technology and test results, the battery on Lantu FREE has reached the industry-leading level in terms of safety performance. As the first mass-produced model launched by the Lantu brand to the market, Lantu FREE's high-standard safety technology and rigorous safety tests have laid a good foundation for its success in the market. In fact, whether it is a common brand or a high-end brand, the safety of automotive products has always been the area that users are most concerned about. Through this technology sharing, Lantu FREE's breakthroughs and achievements in the field of battery safety technology also let us see the hope of this young new energy high-end brand.
