Abstract: A battery cover includes a top cover assembly and an insulating support. The top cover assembly can be fixedly connected with a case to form an accommodation space for accommodating a core, and the top cover assembly can be welded with a tab on the core. The insulating support can be accommodated in the accommodation space. The insulating support and the top cover assembly form an accommodation cavity for accommodating the tab, and the insulating support is provided with a notch for the tab to pass through.

Abstract: Disclosed in the present application is a self-heating structure and a battery pack including the same. The self-heating structure includes a heating member, including a heating body and a connection lead molded on the heating body, the connection lead being used for electrically connecting a positive electrode tab of a core pack or a negative electrode tab of the core pack, so that a self-heating circuit is formed by the heating member and the core pack; and a control unit, controlling an on/off switching of the self-heating circuit according to temperature of the core pack, the control unit being provided on the connection lead to integrate the control unit and the connection lead.

Abstract: An electrode thickness control method and a control system is provided. The control method includes: obtaining an initial thickness and a target thickness of a to-be-rolled electrode; controlling, according to the initial thickness and the target thickness, a target device to roll the to-be-rolled electrode; obtaining first thickness change data of the to-be-rolled electrode, second thickness change data of a rolled electrode formed through rolling, and current rolling speed data of the target device; and adjusting, according to the first thickness change data, the second thickness change data, or the current rolling speed data, a current rolling pressure or a current rolling temperature of the target device, to cause a thickness of the rolled electrode to reach the target thickness.

Abstract: The present application provides a wind turbine and a converter filter capacitor switching control method, device and system therefor. The method includes: acquiring a contactor delay influence factor of the converter and an approximate zero voltage period of the power grid connected to the wind turbine, wherein an absolute value of a voltage of the power grid in the approximate zero voltage period is less than an approximate zero voltage threshold; obtaining a contactor delay duration according to the contactor delay influence factor, wherein the contactor delay duration is a duration from when the contactor receives a switching instruction to when the contactor is switched on or off; determining a switching time point of the filter capacitor based on the approximate zero voltage period and the contactor delay duration; transmitting the switching instruction to the contactor when the switching time point is reached.

Abstract: Embodiments of the present disclosure are a pitch-based negative electrode material for a sodium-ion battery and related methods and applications. The method comprises: placing a pitch recursor into a muffle furnace to allow the pitch precursor to experience pre-oxidation for 2 to 6 hours at a temperature ranging from 200° C. to 350° C., to obtain pre-oxidized pitch; placing the pre-oxidized pitch into a high-temperature carbonization furnace, and increasing the temperature to 1300° C. to 1600° C. at a temperature increase speed of 0.5° C./min to 5° C./min, and carrying out thermal treatment on the pre-oxidized pitch in an inert atmosphere for 1 to 10 hours, to allow the pre-oxidized pitch to experience carbonization reactions, oxygen in the pre-oxidized pitch being used for breaking an ordered structure of the pitch during the carbonization of the pre-oxidized pitch, so as to form a wedge-shaped voids disordered structure.

Abstract: A handheld electric hair drier comprising a main body including a primary fluid inlet, a primary fluid outlet, a fan unit, a heating element, and a fluid flow path, and a handle. The fluid flow path comprises a primary fluid flow path that extends from the main body to the primary fluid outlet along a straight line, a side fluid flow path, and a wall-defined fluid flow path. Air fluid drawn through the side fluid flow path and the wall-defined path enters the fan unit through the primary fluid flow path. The fan unit is arranged on the primary fluid flow path, and the fan unit sucks fluid into the primary fluid flow path and transmits the fluid to pass through the heating element, so that the fluid in the primary fluid flow path is heated. The hair drier can provide high-pressure jet airflow and improve the air supplementing speed.

Abstract: A carbon-based anode material with high ramp capacity, a preparation method therefore, and a use thereof. The method includes placing a carbon source precursor into a crucible and heating to 400° C-1000° C. at a heating rate of 0.2° C./min-30° C./min under an inert atmosphere, wherein the precursor includes any one or a combination of at least two of fossil fuel, biomass, resin, and organic chemicals; and carrying out heat treatment on the precursor at a temperature of 400° C. to 1000° C. for 0.5-48 hours to carbonize the precursor to obtain a carbon-based negative electrode material. The specific surface area of the anode material is less than 10 m2/g. and assembling the obtained electrode material into a sodium ion battery and then carrying out charging and discharging between 0 and 2.5 V, to obtain a voltage curve. The ramp capacity being above 180 mAh/g and the first-cycle Coulombic efficiency is above 75%.

Abstract: Embodiments of the present disclosure are a pitch-based negative electrode material for a sodium-ion battery and related methods and applications. The method comprises: placing a pitch recursor into a muffle furnace to allow the pitch precursor to experience pre-oxidation for 2 to 6 hours at a temperature ranging from 200° C. to 350° C., to obtain pre-oxidized pitch; placing the pre-oxidized pitch into a high-temperature carbonization furnace, and increasing the temperature to 1300° C. to 1600° C. at a temperature increase speed of 0.5° C./min to 5° C./min, and carrying out thermal treatment on the pre-oxidized pitch in an inert atmosphere for 1 to 10 hours, to allow the pre-oxidized pitch to experience carbonization reactions, oxygen in the pre-oxidized pitch being used for breaking an ordered structure of the pitch during the carbonization of the pre-oxidized pitch, so as to form a wedge-shaped voids disordered structure.

Abstract: The invention discloses a sodium ion secondary battery anode material, and a preparing method and application thereof. The material is an amorphous carbon material, and is obtained by performing high-temperature pyrolyzing on coal as a main raw material, the material is prepared by using coal and a hard carbon precursor as raw materials, mechanical mixing after adding a solvent, drying, and crosslinking, curing and pyrolyzing under an inert gas atmosphere, or prepared by using coal as a raw material, and pyrolyzing under an inert gas atmosphere. The sodium ion secondary battery prepared from the amorphous carbon material as anode material has lower cost and higher work voltage, and is stable in cycle and good in safety.

Abstract: The invention discloses a sodium ion secondary battery anode material, and a preparing method and application thereof. The material is an amorphous carbon material, and is obtained by performing high-temperature pyrolyzing on coal as a main raw material, the material is prepared by using coal and a hard carbon precursor as raw materials, mechanical mixing after adding a solvent, drying, and crosslinking, curing and pyrolyzing under an inert gas atmosphere, or prepared by using coal as a raw material, and pyrolyzing under an inert gas atmosphere. The sodium ion secondary battery prepared from the amorphous carbon material as anode material has lower cost and higher work voltage, and is stable in cycle and good in safety.

Abstract: A layered oxide material, a preparation method, an electrode, a secondary battery and use are disclosed. The layered oxide material has a general chemical formula NaxCuiFejMnkMyO2+?, in which M is an element that is doped for replacing the transition metals; x, y, i, j, k, and ? are respectively the molar ratios of respective elements, provided that x, y, i, j, k, and ? satisfy the relations: y+i++j+k=1, and x+my+2i+3j+4k=2(2+?), where 0.8?x?1, 0<i?0.3, 0<j?0.5, 0<k?0.5, 0.02???0.02, and m is the valence of M. The layered oxide material has a space group of R3m.

Abstract: A layered oxide material, a preparation method, an electrode, a secondary battery and use are disclosed. The layered oxide material has a general chemical formula NaxCuiFejMnkMyO2+?, in which M is an element that is doped for replacing the transition metals; x, y, i, j, k, and ? are respectively the molar ratios of respective elements, provided that x, y, i, j, k, and ? satisfy the relations: y+i++j+k=1, and x+my+2i+3j+4k=2(2+?), where 0.8?x?1, 0<i?0.3, 0<j?0.5, 0<k?0.5, 0.02???0.02, and m is the valence of M. The layered oxide material has a space group of R3m.

Abstract: The present invention discloses a layered copper-containing oxide material and a preparation process and purpose thereof The material has a general chemical formula of Na0.68+aNibCucMdMneO2+?, where Ni, Cu, M, and Mn respectively form octahedral structures together with six oxygen atoms that are most adjacent therein, the octahedral structures have arrangements with common edges and constitute transition metal layers; alkali metal ions Na+ are located between every two of the transition metal layers; M is specifically one or more of Mg2+, Mn2+, Zn2+, Co2+, Al3+, B3+, Cr3+, Mn3+, Co3+, V3+, Zr4+, Ti4+, SiO4+, Mo4+, Ru4+, Nb4+, Sb5+, Nb5+, Mo6+, and Te6+; and a, b, c, d, e, ?, and m meet (0.68+a)+2(b+c)+md+4e=2(2+?), and b+c+d+e=1.

Abstract: A kind of pyrolyzed hard carbon material, preparation and its applications are involved in this patent. The particle of this material has spherical or ellipsoidal morphology with smooth surface. The average particle size is in the range of 0.05/100 microns and the coarseness is not more than 0.5% of the particle size. The BET specific surface area is from 1 to 4000 square meters per gram. The inner pore size of the material is distributed between 0.3 and 50 nanometers, and the values of Le and La are from 1 to 20 nanometers. The real density of the material is from 0.8 to 2.2 grams per cubic centimeter and the tap density is 0.35/1.5 grams per cubic centimeter. The preparation of the material can be described as follows: firstly the precursors are mixed with solvents for homogenous distribution systems, then the mixtures are put into autoclave for dewatering. ollowing with washing, filtrating, drying and high-temperature treatment, the hard carbon material is obtained.