Symposium on expansion force and safety of automotive power battery was successfully held

Release time:

2023-04-03 13:32

  On September 17, 2021, Professor Lu Languang, the main leader of the smart battery sensor research team of Tsing Technology and Tsinghua University power battery expert Ouyang Minggao, and the main team members discussed the application of TAS thin film sensor in power battery safety. Have full communication.
  First of all, Professor Lu Languang fully elaborated on the current pain points of safety monitoring in the power battery industry. Based on the general idea of online monitoring of battery expansion force, the Tsinghua team seeks "tactile skin" technical support for the next generation of smart batteries, and further studies the integratability of the BMS battery management system, thereby improving the feasibility of the overall solution and accelerating the implementation of the industry. . Professor Lu said that it is still far from enough to monitor the safety and health status of power batteries through voltage, gas, temperature, potential and other dimensions. There is still a huge gap in the analysis of failure factors of power battery fire in the electric vehicle industry. This is a new sensor A broad space for value. At the same time, multiple sets of experimental data of the research group show that the battery expansion force has a strong correlation with battery safety. For example, the research group accelerates the aging of the power battery through cyclic charge and discharge, and intervenes in the expansion force monitoring of the battery life cycle through the titanium deep TAS sensor in the process, which can effectively judge the aging degree of the battery and infer the internal lithium precipitation state, and then Before the battery fails or a safety risk occurs, the force dimension is used to provide safety warning, and then the electric vehicle algorithm can warn the battery explosion and fire risk earlier to ensure the safety of users. Therefore, it is very necessary to monitor battery safety in real time from the dimension of force, and once this monitoring method is implemented, it will represent a step in the upgrade of battery safety warning and protection capabilities, which is of great significance to the safety needs of the battery industry. In addition, further big data research based on the force dimension will also provide new data dimensions for the BMS algorithm. For example, the charging current can be adjusted in real time according to the expansion force during the fast charging process, which can improve the charging efficiency while ensuring battery safety and protecting battery life. .

  Mr. Lu Yao from the team of Academician Ouyang of Tsinghua University gave a detailed explanation of his current scientific research direction, online monitoring expansion force scheme, EU BMS scheme and industry situation; he introduced that the EU battery route and the joint research project carried out by the research group have initially proved that The early warning effectiveness of force-dimensional online monitoring in battery safety management.
  Figure 1 The relationship between pressure and battery performance (picture from Tsinghua University)
  Wang Xiaoyang, CEO of TacSense Technology, firstly introduced the entrepreneurial background of the returnee scientists of TacSense Technology and alumni of Tsinghua University, as well as the original intention to solve the "neck-stuck technology" for the country from the independent patent technology of the whole chain and realize the empowerment of tactile AI in intelligent manufacturing. Further, TacSense Technology introduced the existing products and solutions for the expansion force test in the power battery industry in detail, and focused on sharing the industrial experience of TacSense in the power battery industry.

  Wang Xiaoyang said that TacSense has now deeply participated in the force dimension monitoring of the entire power battery industry chain including battery cell manufacturers, OEMs, testing institutions and universities, and has accumulated rich experience in application scenarios and production testing data. experience. Such a data base is a very necessary prerequisite for cooperating with Tsinghua University to monitor the expansion force in real time, and it can efficiently provide solutions based on actual scenarios. In response to the cost factor mentioned by the Tsinghua team, Wang Xiaoyang said that TacSense , as a provider of fully independent intellectual property rights and a full-chain solution, coupled with the mass production capacity of consumer electronics, will be able to realize real-time monitoring of smart batteries with ultra-high cost performance , to escort millions of electric vehicle users.
  Figure 2 The discussion between Tsinghua University and TacSense Technology on automotive power battery, expansion force and safety
  The two parties also had a brainstorm on the common cell types on the market, and discussed the possible loading positions of the thin-film sensor and the wiring connection method with the BMS chip. Experts from BAIC Group were invited to provide valuable opinions on TacSense 's pressure distribution detection scheme and smart battery real-time monitoring scheme; scheme experts from China Mobile Integration also shared the remote sensing of electric vehicles from the Ministry of Emergency Response and national energy enterprises. Monitoring management, and the market demand of the energy storage industry, and expressed the willingness to cooperate with TacSense to connect "sensing" to "communication" and "platform intelligence" in the future.

  Figure 3 Tsinghua University and TacSense Technology brainstorm on the pressure detection point of power battery cells
  All parties agreed to discuss the roadmap for the "on-board" of the TacSense deep tactile sensor after the 11th, in order to empower the power battery industry as soon as possible, and to discuss the selection of OEMs and their supporting battery cell suppliers to carry out pre-research projects, before the end of the year. Realize the smart skin haptic upgrade of small batch cells.
  Introduction of Tsinghua University Expert Group
  Lu Languang, professor, senior engineer. Tsinghua University power battery expert Ouyang Minggao Academician Ouyang Minggao's research group smart sensor project team leader; one of the Chinese leaders in the battery direction of the Sino-US Clean Energy International Cooperation Project; Tsinghua-Toyota Joint Research Fund "Smart Battery Based on Smart Materials and Advanced Sensing One of the project leaders of "Key Technology Research"; published more than 100 academic papers above core journals, 66 papers were included in SCI, and 5 highly cited ESI papers; won 83 national patents; 5 provincial and ministerial science and technology awards; won 2016 The first prize of China Automobile Industry Technology Invention Award.
  Introduction to TacSense Technology
  TacSense Technology (Shenzhen) Co., Ltd. (TacSense) develops and owns the world's most sensitive and flexible tactile sensing technology-Flexible Ionization Sensing Technology (FITS), which can provide real-time, high-quality, low-noise tactile sensation /pressure signal, and has physical properties such as full flexibility, optical transparency and ultra-thin packaging, full independent intellectual property rights, and full chain advantages, dedicated to solving the pain points of pressure sensitivity and pressure distribution needs in various industries such as industry, consumer electronics, health, and medical care .

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