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On December 2, at the "Battery Day" event held by Honeycomb Energy, Yang Hongxin, the president of Honeycomb Energy, released the "cold bee" technology, which has been the focus of Honeycomb Energy for many years, aiming to provide multiple and systematic safety assurance for the power battery, the heart of electric vehicles.

So, what is "cold bee"? What are the characteristics of the "cold bee" of honeycomb energy?

"Cold bee" is a systematic solution to the thermal runaway of power battery.

"Cold bee" has four guarantees:

The thermal stability of materials is the cornerstone of battery safety, so both Honeycomb Energy and Ningde Times have chosen to start from the perspective of high safety materials. Single crystal design is an effective method to improve the thermal stability of high nickel system materials. Research shows that the O2 release temperature of single crystal structure materials is significantly higher than that of polycrystalline structure materials in the range of 200-300 ℃, indicating that the thermal stability of single crystal materials is significantly better than that of polycrystalline structure materials.

In the "Cold Bee" solution, Honeycomb Energy has developed a single crystal cobalt-free cathode material. By properly raising the voltage, it can obtain the energy density similar to that of the NCM811 system material, and the safety of the single crystal cobalt-free material is significantly improved compared with the 811 system, in which the DSC thermal decomposition temperature is increased by 10-15%, the ARC thermal runaway problem is increased by 15-20%, and the overcharge resistance is 140% (higher than 125% of 811), Therefore, compared with 811 system materials, the cycle life is also 65% higher.

Therefore, the single crystal cobalt-free material with significantly improved safety is the first guarantee for the safety of the "cold bee" system.

Generally, lithium-ion batteries use carbonate based electrolyte. Although this kind of electrolyte has good conductivity and electrochemical stability, its flammability makes it burn and release a large amount of heat when the battery is out of control, exacerbating the thermal runaway of the single battery, and accelerating the diffusion of the thermal runaway in the battery package.

Solid electrolyte can effectively solve this problem. However, the technology of solid state battery is not mature at present, so the semi-solid electrolyte solution between the traditional liquid electrolyte and solid electrolyte has become the current competition focus of major manufacturers.

From this point of view, Honeycomb Energy launched a "jelly battery" with semi-solid electrolyte in the form of jelly in this activity. This new battery has the characteristics of high conductivity, self-healing and flame retardance, which can end the occurrence of thermal runaway without reducing the electrical performance.

These characteristics of jelly battery can make it pass the 150 ℃ hot box test which is difficult for conventional lithium ion battery to pass, and realize that the battery will not fire and smoke when full electric needle is punctured, which becomes the second safety guarantee of "cold bee" scheme.

The power battery pack is usually composed of hundreds of single cells. Once one of the single cells is out of control, the generated high temperature will rapidly spread to the adjacent single cells, resulting in the diffusion of heat out of control. This process is often very rapid, which seriously affects the safety of the power battery pack. In order to ensure the safety of drivers and passengers of new energy vehicles, the new national standard of power battery requires that the thermal runaway diffusion time of battery pack shall not be less than 5min, which puts forward high requirements for the design of battery pack.

In order to improve the safety of the battery pack, Honeycomb Energy introduced the thermal barrier battery pack technology on the basis of cobalt-free single crystal materials and jelly batteries. This technology can prevent the heat spread inside the battery pack by means of thermal insulation design, active pressure relief, emission control, physical cooling and early warning. Its prevention and control effect far exceeds the requirements of the national standard and becomes the third security guarantee of the "cold bee" scheme.

Through the safety design of materials, batteries and battery packs, the "Cold Bee" system has been able to achieve the absolute safety of power batteries, but Honeycomb Energy has not stopped there, but has turned its attention to cloud computing, big data, AI and other advanced technologies.

Honeycomb Energy and Professor Lu Languang of Tsinghua University have cooperated to develop the internal short circuit prediction and life assessment model. Through cloud computing aided diagnosis, Honeycomb has created a security monitoring platform. The platform has continuously monitored more than 90000 electric vehicles, with more than 20 monitoring projects. And according to the data of Professor Lu Languang's team at Tsinghua University, through the actual verification of 13000+vehicles, the prediction accuracy of the model can reach 90.9%, and it can realize the short circuit warning in the power battery two months in advance, thus ensuring the absolute safety of drivers and passengers, thus creating the fourth safety guarantee for the "cold bee" scheme.

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