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This application provides an electrolyte for lithium-ion secondary battery and a battery. The electrolyte includes a solvent, an additive composition, and a lithium salt. The additive composition includes a compound of formula I and at least one of compounds of formula II and formula III. The resulting battery has a high voltage and exhibits good cycling performance and storage performance at high temperature. <img class="EMIRef" id="4c42c2a9-2876-4caa-84d2-2032ba1e3e8f-ia01" /> In the formulas, the symbols are as defined in the specification.

This application provides an electrode assembly and a manufacturing method thereof, a battery cell, a battery, and an electric apparatus. The electrode assembly includes a first electrode plate, and separators provided on two sides of the first electrode plate in a thickness direction of the electrode plate and stacked with the first electrode plate; where in an unfolded state of the electrode assembly, the separator has first edge portions each exceeding an end of the first electrode plate in a length direction of the separator, and the separator has second edge portions each exceeding an end of the first electrode plate in a height direction of the separator; and in the thickness direction of the electrode plate, the corresponding first edge portions on two sides of the first electrode plate are at least partly hot-melt connected to form first hot-melted segments, and the corresponding second edge portions on two sides of the first electrode plate are at least partly hot-melt connected to form second hot-melted segments. The technical solution in this application can enhance the electrochemical performance of batteries and improve the safety and reliability of batteries.

An embodiment of the present application provides an electrode assembly, a battery cell, a battery, and an electrode assembly manufacturing device and method, which belong to the technical field of batteries. The electrode assembly includes a negative electrode plate and a positive electrode plate, the negative electrode plate and the positive electrode plate being wound in a winding direction to form a winding structure, the winding structure including a bending area. Both the negative electrode plate and the positive electrode plate include a plurality of bending portions located in the bending area. At least one bending portion in the negative electrode plate is a first bending portion, and an active substance capacity per unit area outside the first bending portion is greater than an active substance capacity per unit area inside the first bending portion; and/or, at least one bending portion in the positive electrode plate is a second bending portion, and an active substance capacity per unit area outside the second bending portion is greater than an active substance capacity per unit area inside the second bending portion. In the electrode assembly of this structure, the active substance arrangement in at least part area of the bending area of the electrode plate is more reasonable with better economic efficiency.

The present application discloses a positive electrode active material and a preparation method thereof, a positive electrode plate, a lithium-ion secondary battery and a battery module, a battery pack and an apparatus related thereto. The positive electrode active material includes a lithium nickel cobalt manganese oxide, the molar content of nickel in the lithium nickel cobalt manganese oxide accounts for 60% - 90% of the total molar content of nickel, cobalt and manganese, and the lithium nickel cobalt manganese oxide has a layered crystal structure of a space group R 3m; a transition metal layer of the lithium nickel cobalt manganese oxide includes a doping element, and the local mass concentration of the doping element in particles of the positive electrode active material has a relative deviation of 20% or less; and in a differential scanning calorimetry spectrum of the positive electrode active material in a 78% delithiation state, an initial exothermic temperature of a main exothermic peak is 200°C or more, and an integral area of the main exothermic peak is 100 J/g or less.

A coating-free non-stick pan features a uniform distribution of micro-nano concave-convex structures on the surface of the pan body. The micro-nano concave-convex structures include micro-nano protrusions or micro-nano depressions. The micro-nano protrusions are particle films formed by particles, with the thickness of the particle film ranging from 0.1 to 0.98 µm, and the size of the particles forming the particle film being 0.02 to 0.3 µm. The diameter of the micro-nano depressions includes densely distributed depressions of 0.1 to 0.98 µm.The pan is equipped with micro-nano concave-convex structures with multi-level diameter sizes. The diameter of the micro-nano depressions further includes 40±20 µm and 5±2 µm. The micro-nano depressions are processed and prepared by pressing or corrosion methods, with a depth ranging from 20 to 1500 nm.

This disclosure discloses a storage and charging integrated apparatus, a charging control method, a charging pile, and a charging system. The storage and charging integrated apparatus includes an energy storage module, a direct-current conversion module, and a charging module; where an input terminal of the direct-current conversion module is configured to receive a first charging power input from an external source; a first output terminal of the direct-current conversion module is connected to a first terminal of the charging module, a second output terminal of the direct-current conversion module is connected to a first terminal of the energy storage module, and a second terminal of the charging module is connected to a second terminal of the energy storage module; and the charging module is connected in series with the direct-current conversion module and the energy storage module, and is configured to output or receive electric energy to or from a to-be-charged device. In this way, the storage and charging integrated apparatus can achieve voltage adaptation with various devices to be charged, which expands the scope of application of the storage and charging integrated apparatus and improves the charging efficiency.

The present application discloses an electrolyte solution, a secondary battery, a battery module, a battery pack and a powered device. The electrolyte solution comprises an organic solvent and an additive, the organic solvent comprises a first organic solvent shown in Formula 1, and the additive comprises a first additive selected from one or more of compounds represented by Formula 2A and Formula 2B. In Formula 1, R<1> and R<2> are each independently one of C1-C3 alkyl and C1-C3 haloalkyl; in Formula 2A, R<21>, R<22>, R<23>, and R<24> are each independently one of single bond and methylene; in Formula 2B, R<31>, R<32>, R<33>, and R<34> are each independently one of a single bond and methylene, and R<4> is one of a single bond, -O-, C1-C3 alkylene, C1-C3 haloalkylene, and C1-C3 oxaalkylene. The secondary battery of the present application has good fast charging performance while ensuring long cycle life and storage life. <img class="EMIRef" id="a7fb7e6d-80ee-4e58-b84d-aa307d6443be-ia01" /> <img class="EMIRef" id="a7fb7e6d-80ee-4e58-b84d-aa307d6443be-ia02" /> <img class="EMIRef" id="a7fb7e6d-80ee-4e58-b84d-aa307d6443be-ia03" />

This application discloses a rotary dehumidification device, and relates to the field of air conditioning technology. The rotary dehumidification device includes a dehumidification passage, a regeneration passage, a dehumidification module, and an indoor air passage, where the dehumidification passage has a fresh air inlet and an exhaust outlet; the regeneration passage has a first air intake position and a moisture exhaust outlet; the dehumidification module includes a rotatably arranged primary dehumidification rotor, where the primary dehumidification rotor has a first moisture absorption zone and a first regeneration zone arranged along a circumferential direction of the primary dehumidification rotor, the first moisture absorption zone is located between the fresh air inlet and the exhaust outlet, and the first regeneration zone is located between the moisture exhaust outlet and the first air intake position; and the indoor air passage is in communication with the first air intake position. The technical solution of this application facilitates regulation of indoor humidity and air pressure.

This application provides a battery current collector and a preparation method thereof, a secondary battery, a battery module, a battery pack, and an electric apparatus. The battery current collector includes a foam metal layer (1) and a strength enhancement layer (2), where the strength enhancement layer (2) is a sheet-shaped metal layer, and the strength enhancement layer (2) and the foam metal layer (1) are stacked and metallurgically bonded, alleviating a problem of poor mechanical performance of current collectors in the related art. The strength enhancement layer (2) and the foam metal layer (1) are connected by metallurgical bonding, which helps ensure not only structural strength of the strength enhancement layer (2) and the foam metal layer (1), but also good conductivity between the strength enhancement layer (2) and the foam metal layer (1). Further, the manner of metallurgical bonding helps reduce production costs.

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