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77results about How to "Solve technical problems with low security" patented technology

Lithium battery electrode plate and manufacturing method therefor

The invention discloses a lithium battery electrode plate and a manufacturing method therefor. The lithium battery electrode plate comprises a positive electrode inner layer electrode plate and a positive electrode outer layer electrode plate, wherein the positive electrode inner layer electrode plate comprises a positive electrode inner layer active material; the positive electrode outer layer electrode plate comprises a positive electrode outer layer active material; the stability of the positive electrode inner layer active material is higher than that of the positive electrode outer layer active material, wherein the positive electrode inner layer active material comprises one or more of lithium iron phosphate, lithium cobalt oxide, a nickel-cobalt-manganese ternary material, a nickel-cobalt-aluminum high-nickel material and lithium titanate; and positive electrode outer layer active material comprises one or more of lithium iron phosphate, lithium cobalt oxide, the nickel-cobalt-manganese ternary material, the nickel-cobalt-aluminum high-nickel material and lithium titanate. The lithium battery electrode plate provided by the invention adopts a dual-layer electrode structure, so that relatively high safety performance can be obtained.
Owner:SHENZHEN BAK POWER BATTERY CO LTD +1

Vehicle speed measuring method and device based on electric vehicle

The invention provides a vehicle speed measuring method and device based on an electric vehicle. The vehicle speed measuring method based on the electric vehicle comprises the steps that when a motor controller of the electric vehicle cannot obtain vehicle speed information from an antilock brake system (ABS) of the electric vehicle, according to the motor rotary speed of the electric vehicle, the vehicle speed estimated value is calculated and obtained, according to the accelerated speed of the electric vehicle, the accuracy of the vehicle speed estimated value is verified, and if verification of the vehicle speed estimated value is passed, according to the vehicle speed estimated value, the vehicle speed of the electric vehicle is determined. Compared with the prior art, when the ABS breaks down, the vehicle speed information cannot be obtained, and the vehicle speed calculated and obtained through the motor rotary speed can cause the calculated and obtained vehicle speed to be inaccurate due to skidding or locking of the vehicle so that the situation that whether safety exists or not is judged by a driver according to the accurate vehicle speed information cannot achieved, and the potential safety hazard of driving operation exists; and according to the vehicle speed measuring method, the technical problem that in the prior art, safety is low is solved.
Owner:BEIJING ELECTRIC VEHICLE

FPGA-based SPWM variable-frequency speed control system and control method thereof

An FPGA-based SPWM variable-frequency speed control system and a control method thereof belong to the technical field of variable-frequency control. A system in the prior art has low security. The FPGA-based SPWM variable-frequency speed control system comprises an inverter main circuit connected with an electric device to be called, wherein the inverter main circuit is connected with an ARM control circuit through a current-limiting starting circuit; the inverter main circuit is connected to an overvoltage and undervoltage detection circuit and the ARM control circuit through a voltage detection circuit; the overvoltage and undervoltage detection circuit is connected with the ARM control circuit; the inverter main circuit is connected with the ARM control circuit through an overtemperature protection circuit; the ARM control circuit is connected to a driving circuit through a SPWM waveform generating module; the inverter main circuit and the electric device to be called are connectedwith the overcurrent protection circuit and the ARM control circuit through the current detection circuit respectively; the overcurrent protection circuit is connected with the ARM control circuit; and the ARM control circuit and the inverter main circuit are connected to achieve pump rise limit control. The FPGA-based SPWM variable-frequency speed control system is improved in safety and reliability. The SPWM variable-frequency speed control system is further improved in cooperation with the method.
Owner:GUANGDONG VOCATIONAL & TECHNICAL COLLEGE

Anti-addiction triggering method and device based on fingerprint unlocking, terminal and storage medium

The invention discloses an anti-addiction triggering method and device based on fingerprint unlocking, a terminal and a storage medium, the method is applied to the terminal, and the method comprisesthe following steps: if a fingerprint unlocking request is detected, obtaining first fingerprint information in real time based on a fingerprint sensing element, and analyzing to obtain to-be-matchedfingerprint characteristics of the first fingerprint information; acquiring a fingerprint feature database pre-stored in a terminal, and performing feature detection on the to-be-matched fingerprint features based on the fingerprint feature database, the fingerprint feature database comprising standard fingerprint features and student fingerprint features; if it is detected that the to-be-matchedfingerprint feature is a standard fingerprint feature, unlocking the terminal, and entering a terminal standard mode; and if it is detected that the to-be-matched fingerprint feature is the student fingerprint feature, unlocking the terminal, and entering a terminal anti-addiction mode. The security of the anti-addiction mode of the terminal is improved, and the technical problem that the securityis not high due to the fact that password unlocking of a traditional terminal is easy to crack is solved.
Owner:NUBIA TECHNOLOGY CO LTD
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