Regarding the safety of electric vehicle power battery, it has always been the core concern of consumers. After all, as long as you see a natural car on the road, most people’s first reaction is almost all, the electric car is still . Although the self-ignition of the fuel car is more than the electric car, the electric car is fast, the fire is fierce, and the consequences are full of worry and concerns about battery safety.
So the entire electric vehicle industry is the security problem of the power battery, it can be said to be 殚殚, constantly enter. Last year, the lithium iron battery was rely on the congenital security advantage. After the disadvantage of energy density, the market accounting is greatly improved. In the publication of the new car of the 342nd Department, the lithium iron loading is more than ternary lithium, display After the energy density reaches a certain level, the pursuit of safety has become a priority of car enterprises to choose power battery products.
Of course, the energy density of the ternary lithium battery is higher, the low temperature performance is better, the working voltage band is wide, and the SOC monitor is more accurate, etc., the battery factory and the car main unit It is impossible to abandon this technical route. Therefore, in 2021, there were several manufacturers to release the new safety protection technology of the three-yuan lithium power battery, upgrade the safety protection of the three-yuan lithium battery to 2.0 era, and fully enter the “no fire, not exploding” two constant And today, the battery protection technology to be said is more advanced, and there is no more than two, “no smoke”.
The three-speed battery that realizes “no smoke, no fire, not exploding” is a new battery pack used by the 图 free pure tram type released today. In order to reach three not the level, the 图 relies on the three highlights of battery safety: “3D insulation wall” technology; BMS battery safety monitoring and early warning model; high security battery PACK program.
3D insulation wall
The three-dimensional insulation wall is not a real wall, but a set of defensive mechanisms that diffuse the battery. Among the safety protection of the three-dimensional battery, the thermal out of control of the battery is the protection object, the protection mechanism is not to prevent thermal out of control of the battery, which is the task of the battery management system. The protection mechanism is thermal out of control in the batteryThereafter, the heat of the uncontrolled battery is to spread, which in turn leads to a heat safety incident of the entire battery pack, so insulation has become the most important R & D direction.
This is the structure of the “triad heat insulating wall” of the FREE battery, and the battery cell is used with super high molecular insulation flame retardant materials. The battery core achieves a separate 3D three-dimensional parcel to form an efficient insulation flame retardant protective layer, and each cell is in the sufficient package of heat insulating flame retardant materials, such as “amber”. Ok, Amber is the most famous picture, everyone feels, the battery is like the mosquitoes that have dinosaur blood, they are wrapped in strict parcels.
The heat-resistant 1000 degree heat-insulating flame retardation layer is additionally arranged at the top of the cell, and the heat to the passenger compartment can also be blocked under the most extreme conditions. The conduction is given to the most powerful protection in the car. 
From the overall design of the “three-dimensional insulation wall”, we are not difficult to see the main R & D direction of the three-dimensional lithium battery in safety protection, that is, hot diffusion Strong blocking, no matter what method, blocking the heat of the out-of-control cell is the bottom line of the existing three-yuan lithium battery safety protection, only this is eligible to be called version 2.0 three yuan lithium battery protection technology .
above is to prevent thermal diffusion The technology, the current BMS battery monitoring and early warning model is the technology that prevents heat loss, “three heat-insulating walls” is passive defense, like a seat belt and airbag, and BMS monitoring and warning is active protection, equivalent to Automatic brakes.
With BMS data, the cloud large database is compared with the monitoring data, and the battery is diagnosed, early warning and life monitoring. When the system finds an abnormal battery monitoring data, the transportation and vehicle are passed through the cloud APP. Early warning system, early warning for users. At the same time, the system uses a high sensitivity temperature detection sensor, monitor the temperature of each battery in real time, with a high-efficiency liquid cooling system, no matter how winter and summer is always guaranteedHigh efficiency temperature range.
High Safety Battery Pack Scheme
This is the protection of the naked eye of the battery, and it is also the easiest to bring confidence in consumers. Figure Free’s battery pack uses the most top protection design in the industry, and has a full-scale protection of the battery from the five aspects of the body protection, high-strength framework, pressure transfer, deformation and battery double insurance.
For battery packs, the biggest challenge comes from lateral collisions, as such collisions can easily result in extrusion deformation, induction heat loss, adopts five protected图 FREE battery pack In the side impact test of C-NCAP, the touches of the European standard sloping side 75deg; angle, 32km / h, and the beam only has a small degree, the battery module is not squeezed. Pressure deformation.
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