Power lithium battery safety ‘starts with small

Power lithium battery safety 'starts with small

In 2019, the resurrection of new energy car subsidy policies realized the manufacturer’s heart, but more worried about the dynamic lithium battery in the accident.. Seeing electric cars that fire and even explode in the news, I don’t know what the owner thinks? Do we drive a daily bomb? Oh, it’s not a bomb on time! When the battery turns into an angry bird, whoever is not touching, it is really a serious thinking.

In contrast, BYD that has been low-key has never had a battery safety accident, which is of course not luck, relying on a hard technical reserve.. It is well known that the BYD power lithium battery also covers a lithium iron phosphate ion battery and a three-dimensional lithium-ion battery, and the high safety of lithium iron ion batteries is mostly used in large commercial vehicles, and the general presence of safety issues is basically equipped with a passenger.

Trimmonic ion battery on the car. From the perspective of the monomer, the three-dimensional lithium-ion battery is divided into soft bag lithium batteries, hard-shell square batteries, and cylindrical batteries..

Compared with the soft bag lithium battery, the hard-shell square battery has three advantages: First, its thermal management module is simpler than the soft boiled lithium battery, and the energy density of the group hard-shell square battery is much higher than the soft boiled lithium battery; second The soft boiled lithium battery is to be sealed with two layers of polymers together, and the hard-shell square battery is sealed by a metal aluminum welding.. Therefore, in terms of sealing, the hard-shell square battery is stronger than the soft boofpsen battery.

Third, when the thermal out of control occurs, the hard-shell square battery can achieve exhaust, exhausting through the orientation design.. Even if a single is out of control, the energy of the monomer can be released through the exhaust passage, while the soft bag lithium battery cannot be realized.

. In contrast, the cylindrical battery monomer used by TSLA is smaller, and the number of cylindrical batteries is much more than the hard-shell square battery under the conditions of the same endless mileage, so that the consistency of the battery is difficult, Controlling risk will also increase. For example, a MODELX is more than 7,000 18650 cylindrical batteries.

In addition, the aluminum hard shell of the square battery is heavier, and the quality of the cylindrical battery steel is heavier, the nozzle is more void, so it is more susceptible to the limit of energy density ceiling.. Therefore, BYD chooses a hard-shell square battery method using integrated safety.

. In order to ensure the high integration of the power lithium battery and the whole vehicle manufacturing, quality is unified. BYD has formed a complete industrial chain developed from mineral development to raw material research and development, battery design and manufacturing process, BMS manufacturing, and module with PACK R & D and manufacturing, and ladder utilization and recycling.

Battery overall security. Let the battery development and the chain linkage of the whole vehicle industry chain is more close, feedback optimization work is more efficient, and the most important thing is to ensure that the safety quality of the power lithium battery can be tracked..

In the monomer level, the use of a more reliable hard-shell square battery does not mean that the battery is safe, and the link and isolation process design of the module level is related to battery safety.. First, the unit battery should be coordinated to output electric power and link it up.

. In this regard, BYD has adopted the industry-leading soft connection and laser welding process in the module. The entire battery module is reliable, bid farewell to the original way of the coarse wire link, completely eliminate the short-circuit risk caused by friction.

. Between the modules, BYD also chose the process more advanced and safe aluminum soldering is replaced by threaded connection..

If the link technology is the active security of the battery module, the isolation technology is passive security. Through the problem of “divide the” “divide the” in the problem, the insulation of the module. Module thermal out-of control management is important to rely on airgel implementation between monomer batteries.

The airgel passes through the PET package, the overall thermal conductivity is less than 0.04W / k.m, and the heat transfer between the monomers can be delayed, and the individual cores of the problem will be isolated, and the overall safety of the battery module can be guaranteed.

. If the module level security is also invalid, it is necessary to upgrade to the battery pack level..

Acting on the battery caused by the violent impact, BYD is designed to design the aluminum alloy material tray of the bee structure.. Through a large number of experiments, this structure occurs when collisions and 剐, there will be collapsed, better absorb energy in the external construction.

. At the same time, the battery pack also adhesive insulation insulation design, energy discharge device, and automatic fire extinguishing device. When the fierce impact causes the vehicle to fire, the driving passenger has enough escape time, and the energy of energy can also be empty.

Control within a certain range. In terms of software, BYD’s battery management system BMS also played a crucial use of battery security..

Collect the voltage, current, temperature and other real-time states of each monomer battery, achieving higher collection accuracy, synchronization, and acquisition frequency, and supply solid foundations for battery management.. Based on accurate data acquisition, BMS can accurately calculate the remainder of the battery, support mileage and battery safety life to guide battery control, facilitate the owner to master the vehicle status, but also the guarantee for the entire system, hardware function security.

In addition, BMS combines the AI ​​algorithm with the support of the background cloud database, and further optimizes battery performance.. For example, BYD presets multiple protective levels for the prevailing of the prevail, first is the voltage of the BMS precisely detect the battery, monitor the battery in real time, charges different voltages to perform different commands, through the limit streaming and cutting relay Method to control the state of charging.

If this is invalid, mechanical CID (CurrentInterRuptDevice) is used. By designing a flip film on the battery cell, the CID is disconnected when the battery is overcharged..

Since the monomer of the battery pack is connected in series, as long as there is a single single body to break, the whole circuit is powered off.. It is worth noting that the CID is a pure hardware protection device is BYD’s patented technology.

. For new energy vehicles, the most important part is too powerful lithium battery. In this regard, the BYD is specializing in 15 years, not only in the energy density and battery management, but more importantly, it has accumulated a set of logical and ring-connected battery safety solutions.

. For consumers, manipulation performance and battery life are important, but all this is premised on security..

The security of the power lithium battery is not a problem that the downtown sheep will be designed.. BYD has systematic thinking and overall control from the issue of the dynamic lithium battery safety side, providing a safe and secure product for users to supply safe and secure products.

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