What you need to know: mandatory battery GB

Recently, the reporter was informed that the revision of the national mandatory standard "Safety Requirements for Lithium-Ion Power Battery for Electric Vehicles" has been basically completed, and it is expected to be released in August this year. The "Safety Requirements for Lithium-Ion Power Battery for Electric Vehicles" is of great significance to the healthy and stable development of the power battery industry. It is believed that with the improvement of regulations, China's power battery industry will usher in a new stage of development.

The "Safety Requirements for Lithium-Ion Power Battery for Electric Vehicles" was established in August 2016. The project cycle is two years. Before this year, the Ministry of Industry and Information Technology issued the "Safety Requirements for Lithium-Ion Power Battery for Electric Vehicles (Consultation Draft)". The community has solicited opinions. At present, the revision of the regulations has been basically completed and will soon enter the review stage. Compared with the recommended national standard in 2015, the new national standard is a mandatory national standard.

It is understood that the changes in the new national standard are:

First, the new national standard test project is divided into two parts: battery unit and battery pack or system, with 6 items and 16 items respectively. Compared with the 2015 standard, the new national standard cancels all module-level tests. The battery cell test project cancels the drop, acupuncture, seawater immersion, and low air pressure tests, while the over-discharge test only requires no fire or explosion. , canceled the requirement for no leakage.

Second, the battery pack or system safety test project canceled the drop and rollover test and added two tests of overcurrent protection and thermal stability. The external fire was also listed in the thermal stability test. In addition, the seawater immersion was changed to the water immersion is safe and the vibration test is divided into two parts.

Third, overcharge, over discharge, short circuit, extrusion, acupuncture, etc. are routine test items for lithium battery safety testing. The new national standard stipulates that the acupuncture test is not implemented temporarily. This is also controversial in the industry. Interpretation, the reason for the cancellation is that the international standard such as IEC did not find acupuncture test, the new energy vehicle access management regulations issued by the Ministry of Industry and Information Technology (Order No. 39) in the acupuncture for the temporary implementation of the project, and the acupuncture test does not match the actual failure mode. There are also people in the industry who believe that as the energy density and battery capacity of power batteries continue to increase, it becomes more and more difficult for batteries to pass acupuncture experiments. Therefore, it is stipulated in the new national standard that the acupuncture experiment is not implemented.

Fourth, a major advancement in the new national standard is to include thermal runaway in the regulations. When the battery pack is out of control, the car should provide an early warning signal and reserve 5 minutes of escape time.

In addition, in the new national standard, new requirements for the overcharge of lithium-ion battery cells have been put forward. In order to improve the safety during charging of the lithium-ion battery, it is proposed to set the cut-off condition during charging to "1.1 times voltage or 115% SOC", thereby reducing the safety hazard of the power battery during charging.

The page contains the contents of the machine translation.