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The present application relates to the technical field of new energy, and particularly relates to a battery electrode plate, a coating method, a coating apparatus, and a battery cell. The battery electrode plate comprises an electrode plate main body, wherein active material layers are respectively arranged on two surfaces of the electrode plate main body. The battery electrode plate further comprises an identification layer, which is arranged on at least one surface and makes the shapes or positions of coatings on the two surfaces different. By means of the manner, the present application can distinguish between the two surfaces of the battery electrode plate that are asymmetrically coated.

This invention relates to a high-precision data acquisition, processing, and magnetic field drive system, mainly comprising a data acquisition module, a processing module, a magnetic field drive module, a power supply module, and a host computer. The data acquisition module converts external analog signals into digital signals and transmits them to the processing module. The processing module includes a processing unit, a high-stability temperature-controlled crystal oscillator, an external clock signal interface, a DDR chip, Flash memory, a high-speed connector, and a digital power supply module. This module performs digital processing such as filtering and phase-locked loop (PLL) on the signals. The host computer can communicate with the FPGA core processing module via both Ethernet and serial ports to control the bias, amplitude, and frequency of the signals generated by the magnetic field drive module, display the read-back online data, and generate real-time curves. This invention realizes a low-cost, high-precision NMR gyroscope magnetic field control system, achieving high-precision closed-loop control of the NMR gyroscope's magnetic field.

The application discloses a parameter-controllable random structure light generating device and method, a laser emits a light beam which sequentially passes through a linear polarizer and a beam expander and then is incident to a beam splitter, the light beam reflected by the beam splitter is a first light beam, the first light beam enters a digital micromirror device loaded with a holographic film to be modulated, a second light beam is obtained after the modulation, the second light beam is incident to the beam splitter again, and is incident to a common-path interference system after being transmitted; the second light beam passes through a first lens in the common-path interference system, positive and negative first-order light spots are filtered out through a pinhole diaphragm at a focal plane of the first lens, the positive and negative first-order light spots pass through two half-wave plates respectively, and then pass through a second lens and a Ronchi grating to be combined into a random vector light beam. The application can accurately generate a random structure light beam, and compared with a traditional structure light beam, can simultaneously control the polarization degree and the spatial coherence degree of the generated random structure light beam.

The invention discloses a high-power synchronous motor excitation device and a control method. The high-power synchronous motor excitation device comprises a multi-pulse excitation transformer, a plurality of three-phase PWM rectifiers, a field suppression circuit and a multi-phase interleaved parallel bidirectional DC-DC converter, wherein the direct current sides of the three-phase PWM rectifiers are connected in parallel; aC side LCL filters of the three-phase PWM rectifiers are connected with windings of the secondary side of the excitation transformer in a one-to-one correspondence manner, and DC sides of the three-phase PWM rectifiers are connected in parallel to form a DC bus; the bidirectional DC-DC converter can quickly, accurately and stably adjust direct-current excitation in a wide range, and provides additional excitation damping to control and suppress low-frequency oscillation of a power system; positive damping electromagnetic torque is provided by adjusting terminal voltage of the synchronous motor, low-frequency oscillation of the power system is suppressed, and stability of the power system is improved. Energy stored by the magnet exciting coil is directly fed back to a power grid through the bidirectional DC-DC converter and the PWM rectifier, and the field suppression circuit is started, so that efficient, rapid and reliable field suppression is realized.