“This paper analyzes the loss composition of the inverter, compares the performance of the fourth generation IGBT and the seventh generation IGBT through thermal simulation, and finally verifies the conclusion through experiments. Under the same working conditions, the loss and junction temperature of IGBT7 are significantly lower than those of IGBT4, so that the volume of the inverter can b...
On August 27, Huawei Technologies Co., Ltd. recently announced a patent for an elastic current collector and its preparation method, battery electrode sheet and flexible lithium-ion battery.
On August 25, 2020, Huawei Technologies Co., Ltd. announced a patent for an elastic current collector and its preparation method, a battery electrode sheet, and a flexible lithium-ion battery. The patent application date was December 6, 2016.
The patent abstract shows that the present invention provides an elastic current collector, including an elastic polymer substrate and a conductive layer disposed on the elastic polymer substrate, the conductive layer has a corrugated structure, and the material of the conductive layer includes Metal and/or carbon materials, the elastic current collector has high flexibility and high cycle stability, and the elastic current collector is used in the preparation of lithium-ion battery electrode sheets, which can effectively avoid the mechanical deformation of the electrode sheet and the internal expansion of the active material. The phenomenon of “powder drop” of the pole piece. The invention also provides a preparation method of the elastic current collector, a battery electrode pole piece and a flexible lithium ion battery using the elastic current collector.
In fact, when it comes to flexible batteries, the following issues have been technical hurdles to overcome:
1) Today’s lithium-ion battery materials themselves are not flexible, how to adapt battery materials to this application scenario
2) When the battery is bent/twisted, how to maintain good contact between the battery material particles and reduce the contact resistance
3) How to ensure that the battery does not leak when the battery is bent/twisted.
4) How to increase the active material load and increase the battery capacity
At present, with the rise of smart wearable devices, the research on flexible batteries is receiving more and more attention.