Tsinghua University

Shell Usa, Inc.

Minggao Ouyang

Li Wang

Hang Li

Languang Lu

Jianqiu Li

Xuning Feng

Yudi Qin

Zhengyu Chu

Yue Pan

Gan Zhang

Jinhai Liu

Yalun Li

Nan Pu

Siqi Zheng

Xiangming He

Bingkun Cai

Jiayi Hu

Liangfei Xu

A lithium-ion battery to be tested is put into a temperature chamber at a first temperature value and subjected to pulsed heating until the pulsed heating time reaches the preset pulse duration. The chamber temperature is adjusted to a second value and a capacity degradation value of the battery is obtained, so as to obtain durability of the battery. Before testing of the capacity degradation value of the battery, continuous pulsed heating is conducted. After the battery is heated for a period of time, the temperature elevation and heat dissipation of the battery will reach stable values and the temperature will no longer rise. Such pulsed heating does not require a long period of standing at low temperature. Therefore, a large amount of test time can be saved, the test period shortened, and the influence of battery temperature on battery durability can be verified through a large number of experiments.

Durability test method and system and data table generation method for battery pulsed heating

The present application relates to a method and system for determining parameters of battery pulsed heating. The reference potential of the anode of the lithium-ion battery is obtained in real time in the positive and negative pulsed heating process under various heating parameters. The relationship between reference potential and threshold potential indicates whether Li plating has occurred to the lithium-ion battery. When the reference potential is smaller than the threshold potential, the first heating parameters are adjusted to avoid Li plating and improve battery life. By recording the heating parameters when the reference potential is greater than the threshold potential, it can be ensured that the pulsed heating parameters have no significant impact on the life of the battery.

Method and system for determining parameters of battery pulsed heating

A method for preparing a reference electrode and a lithium ion battery with a reference electrode. In some embodiments, a method includes the following steps: welding a reference electrode substrate to a lower portion of a current collector metal sheet with a tab-film; melting metal lithium into a liquid state; immersing a lower portion of the reference electrode substrate welded with the current collector metal sheet into the liquid lithium; coating a lower portion of the tab-film with a layer of separator to obtain a reference electrode with a separator coating; inserting the reference electrode between a separator of a core of a lithium ion battery and an anode piece; and packaging in plastic the lithium ion battery implanted with the reference electrode to obtain the lithium ion battery with the reference electrode.

Method for preparing reference electrode and lithium ion battery with reference electrode

The present application relates to a safety prevention and control system and control method of a power battery pack for an electric vehicle. The safety prevention and control system of a power battery pack includes a signal acquisition device, a main controller, and a step-by-step prevention and control execution device. The main controller includes a fault diagnosis device, a cell thermal runaway determination device and a battery pack thermal runaway propagation determination device, which are respectively electrically connected to the step-by-step prevention and control execution device to send different control instructions to the step-by-step prevention and control execution device. The step-by-step prevention and control execution device can execute prevention and control actions of different levels according to the different control instructions sent by the fault diagnosis device, the cell thermal runaway determination device and the battery pack thermal runaway propagation determination device. The safety prevention and control system of a power battery pack for an electric vehicle can provide an active prevention and control measure and a passive prevention and control measure, and according to the actual situation of a specific accident and the prevention and control ability of the prevention and control system, accurately start a prevention and control mechanism, maximize a safety protection effect, and ensure the safety of an electric vehicle occupant.

Safety prevention and control system and control method of power battery pack for electric vehicle

Growing community of inventors

Beijing, China

Minggao Ouyang