-(2)Tsinghua University He Xiangming: The 5-minute fast charging of lithium batteries is a false proposition

(2)Tsinghua University He Xiangming: The 5-minute fast charging of lithium batteries is a false proposition
author:enerbyte source:本站 click207 Release date: 2023-09-14 08:58:10
abstract:
He Xiangming: The common practice for everyone is to screen batteries through a series of parameters such as capacity and voltage. However, these screening processes are currently complex and have limitations in their effectiveness. There are also many problems, some of which are caused by mea...

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He Xiangming: The common practice for everyone is to screen batteries through a series of parameters such as capacity and voltage. However, these screening processes are currently complex and have limitations in their effectiveness. There are also many problems, some of which are caused by measurement errors.

At present, the measurement error of the equipment is mostly around 1%. In fact, to meet the battery consistency requirements, the error needs to be less than 1%. From a manufacturing perspective, fully automated manufacturing engineering has greatly improved consistency by reducing human factors due to fixed equipment accuracy and measurement parameters.

We are also considering other methods to address consistency issues, and have proposed the idea of using series charging and discharging for consistency screening. Specifically, the consistency of all batteries produced from the factory should be screened first, and then connected in series before charging and discharging, in order to prevent equipment errors.

China Energy News: Fire incidents of new energy vehicle batteries are often reported in newspapers, further highlighting the safety issues of lithium batteries. How to ensure battery safety?

He Xiangming: Battery safety accidents are probabilistic events. The current testing standards cannot completely eliminate the safety issues of batteries. Lithium batteries are flammable and have a high energy density, including positive and negative electrodes. The heating during use can cause thermal runaway issues. At present, strengthening technological breakthroughs in battery body technology can ensure the safety of batteries by around 510 years.

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