A new battery management technology can effectively evaluate the remaining residual value of lithium battery packs.

Panasonic has specially developed a new battery management technology that can be used to measure the impedance of the battery, specifically to evaluate the residual value of the lithium battery pack, and it is estimated that it will be applied to vehicles in the future. Panasonic has developed a new battery monitoring IC (BMIC) test chip, algorithm, and software. This technology may promote the recycling of lithium batteries. Normally, if the lithium battery does not work, not all batteries may not work at all. The abnormal situation of a certain cell of the whole set of lithium batteries will cause the whole set of batteries to fail to work or be forced to be scrapped. In many cases, lithium batteries still have great use value. This technology can effectively avoid similar problems. This kind of energy waste. This kind of management technology uses alternating current excitation method. In addition, after confirming the diagnosis, and performing problem evaluation based on the data, the residual value is evaluated. This will help promote the recycling and reuse of lithium-ion batteries and achieve sustainable development. This new technology has the following characteristics: 1. It does not significantly adjust the BMS state under operating conditions, and measures the electrochemical impedance of the battery through the BMIC chip. The traditional BMIC can measure the voltage of a lithium-ion battery pack composed of 6 to 14 cells stacked. In the lithium battery management system, multiple BMICs can be used to obtain voltage data from more battery cells in series (up to 200) to monitor battery operating conditions and ensure safe operation. In addition, it can also evaluate the health of the lithium battery and calculate the remaining cruising range and time. In addition to traditional functions, the newly developed BMIC test chip also has a built-in electrochemical impedance test capability, which uses alternating current excitation method for testing. The electrochemical impedance measurement is completed by 15 completely parallel analog digital converters, 0.1 Hz to 5khz pulse modulation AC excitation circuit, and a complex voltage/complex current conversion circuit built into the BMIC. Therefore, there is no need to make major adjustments to the current BMS equipment in the battery, and the BMIC chip can measure the electrochemical impedance of the battery when the battery is running. 2. The BMIC chip has the same level of measurement accuracy as professional instruments. The Cole-Cole diagram made by complex impedance is tested for accuracy using electrochemical impedance spectroscopy. The cylindrical lithium-ion battery was tested using BMIC and measurement software developed by Panasonic. The results show that the Cole-Cole diagram can be produced in the frequency range of 1 Hz to 5 KHz and reach the same accuracy as the standard industrial instrument. 3. Temperature calibration can respond to temperature changes accordingly. The electrochemical impedance of lithium ion batteries is very sensitive to temperature changes. Therefore, when using special instruments for measurement in the laboratory, the battery should be placed in a constant temperature room to maintain a constant temperature. Regarding the battery module during operation, due to the continuous change of the ambient temperature, stable electrochemical impedance measurement cannot be performed on it. Therefore, Panasonic has developed a temperature calibration technology. During the electrochemical impedance test, the temperature of the lithium-ion battery is monitored at the same time, and the impedance temperature is changed to the standard temperature, and it is made on the Cole-Cole diagram. In this way, even if the ambient temperature changes, it can be calibrated to the standard temperature in the database based on the Cole-Cole diagram. The new technology is suitable for equipment and vehicles with multi-cell lithium-ion batteries, such as electric bicycles, low-speed vehicles, construction and logistics machinery, etc., and can be used in electric vehicles and large-capacity batteries in the future. This technological breakthrough allows the status of lithium batteries to be supervised and makes the operation of lithium batteries safer. Disclaimer: The published articles are all from the Internet and do not represent the views of this site. If there is any infringement, please contact to delete it. WeChat: Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete it. A: The new technology of solid-state batteries can double the energy density of lithium-ion batteries