4results about How to "Without sacrificing performance" patented technology

The invention relates to the technical field of secondary batteries, in particular to a temperature self-adjusting electrode and a secondary battery. The electrode comprises an active material and a composite phase change material, wherein the composite phase change material comprises a first phase change microcapsule and a second phase change microcapsule; wherein the phase change temperature t1 of the first phase change microcapsule is more than or equal to 5 DEG C and less than or equal to 45 DEG C, and the phase change enthalpy Q1 is 100-235J / g; the phase change temperature t2 of the second phase change microcapsule is 20 DEG C lt; t2-t1 < = 155 DEG C, and the phase change enthalpy Q2 meets the following condition: Q2-Q1 < = 200J / g is greater than or equal to 5J / g. According to the electrode provided by the invention, temperature self-adjustment under different working conditions is realized, temperature change is controlled, the service life of the battery under a wide temperature range working condition is prolonged, and meanwhile, thermal runaway of the battery is prevented.

This invention relates to the preparation and application of silicon-carbon anode materials, and discloses a silicon-carbon anode material modified with lithium phosphide nanoparticles, its preparation method, and a secondary battery. The material has a core-shell structure, with the core comprising porous carbon and lithium phosphide nanoparticles and silicon nanoparticles generated in situ within the micropores of the porous carbon; the shell comprises a composite coating layer composed of amorphous carbon and carbon nanotubes; silicon accounts for 45-65 wt% of the modified silicon-carbon anode material by mass, and the P / Si molar ratio of the lithium phosphide nanoparticles to the silicon nanoparticles is 2:98~30:70. A small amount of phosphorus source is first deposited in the porous carbon micropores, followed by lithiation treatment to convert the phosphorus in the porous carbon into lithium phosphide nanoparticles, then a second deposition of silicon nanoparticles, and finally overall carbon coating. This invention's modified silicon-carbon anode material improves the problem of rapid impedance increase in the low-charge range of silicon-carbon anode materials, significantly enhancing the user experience.

The application discloses a current mode staggered control converter and a control chip, wherein the converter comprises a VIN input power supply with a voltage of 20V-100V, forward transformers T1 and T2, two output paths formed by the transformers and subsequent devices, a capacitor C0 as a VCC pin filter capacitor, a resistor R3 as an RT pin resistor connected to the ground and used for controlling the frequency of an oscillator, capacitors C1 and C2 as COMP1 and COMP2 pin capacitors connected to the ground and used for adjusting loop stability, capacitors C3 and C4 as SS1 and SS2 pin capacitors connected to the ground and used for realizing soft start of the system, N3 and N4 as natural synchronous rectifier devices in the forward converter, the first output channel and the second output channel adopting the same structure, an auxiliary winding La providing power supply for an IC control chip VCC through a diode D1, and an output capacitor Cout1 as an output capacitor of the first channel. The whole system is driven and controlled by only one control chip, and the power density is improved, the volume of the scheme is reduced, the cost of the scheme is lowered, and the system performance is not sacrificed.

A gravity detection sensor is provided with a shielding cover, a metal deformation body and a circuit board are provided inside the shielding cover, a Wheatstone strain gauge is attached to the metal deformation body through epoxy AB glue, and the Wheatstone strain gauge includes a Wheatstone bridge formed by four resistors; the first corner point of the Wheatstone bridge is electrically connected to the sensor power pin, the second corner point of the Wheatstone bridge is electrically connected to the signal positive pin, the third corner point of the Wheatstone bridge is electrically connected to the sensor ground pin, and the fourth corner point of the Wheatstone bridge is electrically connected to the signal negative pin; the circuit board is also provided with a channel selector, a preamplifier, an analog-to-digital converter and a digital filter, the signal positive pin and the signal negative pin are electrically connected to the channel selector, the channel selector is electrically connected to the preamplifier, the preamplifier is electrically connected to the analog-to-digital converter, and the analog-to-digital converter is electrically connected to the digital filter. The present invention realizes active, independent and intermittent subsystem high-integration gravity measurement, has good energy-saving effect, is convenient for mass production, and has high precision.