Amperex Technology Limited Patente

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This application discloses a secondary battery and an electronic device, including a housing, an electrode assembly, a first adhesive member, and a second adhesive member. The electrode assembly is disposed within the housing, and the electrode assembly includes a first electrode plate, a separator, and a second electrode plate that are stacked and wound. The first electrode plate includes a first segment, the first segment constitutes an outermost portion of the electrode assembly, and the first segment has a first surface facing a winding central axis and a second surface facing away from the winding central axis. Along the winding direction of the first segment, the first segment includes a terminating segment, where a first surface and a second surface of the terminating segment are blank foil regions. At least part of the first adhesive member is bonded to the first surface of the terminating segment. The second adhesive member is disposed on the second surface of the terminating segment and bonds the second surface of the terminating segment to the housing. Along a direction perpendicular to the first surface, a projection of the second adhesive member partially overlaps a projection of the first adhesive member. For the secondary battery of this application, a risk of failure due to dropping or collision is reduced.

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A negative electrode material, a negative electrode plate, an electrochemical apparatus, and an electric device are provided. The negative electrode material includes a core and a shell layer. The core is porous carbon with pores; where a silicon material is present on wall surfaces of the pores. The shell layer is a carbon material, and the shell layer encapsulates the core surface, sealing the pores. In the negative electrode material, the porous carbon and the carbon material of the shell layer have a disordered structure, resulting in less lithium storage. The pores serve as the primary region for lithium storage, with the silicon material present on the wall surfaces of the pores. The silicon material, as a lithiophilic substance, can induce lithium to enter the pores of the core from the external shell layer of the negative electrode material, enabling deposition position to be controlled during lithium metal deposition, reducing non-uniform lithium metal deposition, and thereby facilitating an improvement in the specific capacity and cycling performance of lithium-ion batteries.

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The present application relates to an electrochemical device and an electronic device. The electrochemical device of the present application includes a positive electrode, a negative electrode, and an electrolyte. The electrolyte includes an additive, where the additive includes a first additive M, and the first additive M is at least one selected from the group consisting of a fluorinated carbonate compound and a compound containing a sulfur-oxygen double bond. The negative electrode includes a negative electrode active material layer, where the negative electrode active material layer includes a negative electrode active material, and the negative electrode active material includes a hard carbon material. The electrochemical device of the present application has improved high-temperature cycling performance, low-temperature performance, and rate performance while maintaining the specific capacity of the negative electrode active material.

A secondary battery and an electronic device are provided. The secondary battery includes a housing, an electrode assembly disposed in the housing, and a first conductive plate. The electrode assembly is a stacked structure. The electrode assembly includes a first electrode plate, a separator, and a second electrode plate that are stacked sequentially in a first direction. The first conductive plate is connected to the first electrode plate. The first conductive plate extends out of the housing along a second direction perpendicular to the first direction. The first electrode plate includes a first outer electrode plate located at an outermost layer of the electrode assembly. When viewed in a third direction perpendicular to both the first direction and the second direction, the first outer electrode plate includes a first region and a second region connected in the second direction. When viewed in the third direction, the first region includes a first end connected to the second region and a second end disposed opposite to the first end in the second direction. The first region extends from the first end so as to deviate from the second direction, and the second end is farther away from the second electrode plate in the first direction than the first end. This application improves anti-overcharge performance.

This application discloses an electrode plate, an electrochemical device, and an electrical device. The electrode plate includes a base portion and a tab. The base portion includes a first edge connected to the tab. The tab includes an extension portion and a connecting portion. Along a length direction of the electrode plate, the extension portion includes a first side edge and a second side edge disposed opposite to each other. The connecting portion includes a third side edge and a fourth side edge disposed opposite to each other. A first connection point is formed between the third side edge and the first side edge. A third connection point is formed between the third side edge and the first edge. A second connection point is formed between the fourth side edge and the second side edge. A fourth connection point is formed between the fourth side edge and the first edge. An extension line of the first side edge intersects the first edge at a first intersection point. An angle between a ray from the first intersection point to the first connection point and a ray from the first intersection point to the fourth connection point is α<1>, satisfying: α<1> < 90°. With a line of connection from the first connection point to the third connection point serving as a first reference line, the connecting portion includes a first reinforcing region defined by the third side edge and the first reference line. This application alleviates the problems of bending and tearing of the tab.

This application relates to a negative electrode material, a negative electrode using the material, an electrochemical apparatus, and an electronic apparatus. Specifically, this application provides a negative electrode material, including graphite, where the negative electrode material has an I-order lithium intercalation plateau potential P1 of 30 mV to 75 mV and an II-order lithium intercalation plateau potential P2 of 90 mV to 110 m V The use of the negative electrode material of this application can significantly improve the cycling performance of the electrochemical apparatus using the negative electrode material under high voltage and high temperature, enhance the gram capacity of the negative electrode material, while maintaining the initial efficiency of the negative electrode material.

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This application discloses an electrochemical apparatus and an electrical device. The electrochemical apparatus includes a housing and an electrode assembly. The housing includes a first housing portion and a second housing portion with opposite polarities. The electrode assembly includes an electrode plate assembly, a first tab, and a second tab, where the electrode plate assembly includes a first electrode plate and a second electrode plate arranged in a wound manner, the first tab is connected to the first electrode plate and the first housing portion, and the second tab is connected to the second electrode plate and the second housing portion. The electrochemical apparatus further includes a first connector, the first connector including a first arc portion and satisfying: 30° ≤ γ + (10.95 × (R₁/R₀)³ - 31.0144 × (R₁/R₀)² + 28.88 × (R₁/R₀) - 7.012) × β₁ ≤ 180°; and/or, the electrochemical apparatus further includes a second connector, the second connector including a second arc portion and satisfying: 30° ≤ γ - (10.95 × (R₂/R₀)³ - 31.0144 × (R₂/R₀)² + 28.88 × (R₂/R₀) - 7.012) × β₂ ≤ 180°. This application facilitates the reduction of an axial magnetic field at an end face of the electrode plate assembly with a wound structure, thereby facilitating the reduction of interference of the electrochemical apparatus on the electrical device.

This application discloses an electrochemical apparatus and an electric device. The electrochemical apparatus includes a first housing portion and a second housing portion of opposite polarities, an electrode assembly, and a first connector. The electrode assembly includes an electrode plate assembly, a first tab, and a second tab. A first electrode plate of the electrode plate assembly is located on a winding inner side relative to a second electrode plate. The first tab is connected to a first region of the first electrode plate. The first tab includes a second region connected to the first housing portion. The second tab is connected to a third region of the second electrode plate. The first connector is connected to the first housing portion, and includes a fourth region configured to be connected to an electric device. A winding length of the first region extending beyond the third region is less than one turn. An angle formed by rotating the third region to the first region around a winding center is θ, satisfying: 45° ≤ θ ≤ 135°. An angle formed by rotating the first region to the fourth region around the second region is α, satisfying: -60° ≤ α ≤ 45°. The electrochemical apparatus of this application is conducive to reducing an axial magnetic field at the end face, thereby reducing interference with the electric device.

A silicon-carbon negative electrode material includes a core and a shell. The core includes a porous carbon skeleton and silicon dispersed in pores of the porous carbon skeleton. Carbon nanotubes are wrapped and dispersed in the porous carbon skeleton. In the silicon-carbon negative electrode material, the content of silicon elements in the silicon-carbon negative electrode material is 25 wt% to 55 wt%. The shell includes a carbon material. In a linear scanning electron microscope and energy-dispersive X-ray spectrum of a cross section of the silicon-carbon negative electrode material, the standard deviation of content changes of the silicon elements from the center to the edge of the cross section does not exceed 200. Further provided are an electrochemical apparatus and a preparation method for a silicon-carbon negative electrode material. This application can improve electrical conductivity and reduce expansion, thereby prolonging the service life.

This application discloses an electrode assembly and a battery cell. The electrode assembly includes a first electrode plate unit and a second electrode plate unit that are wound together. A polarity of the first electrode plate unit is opposite to that of the second electrode plate unit. At least one of the first electrode plate unit or the second electrode plate unit includes an electrode plate, a tab, and a separator. The separator includes a first separator film and a second separator film arranged on two opposite sides of the electrode plate respectively in a thickness direction of the electrode plate. The first separator film includes a first extension portion extending beyond an edge of the electrode plate along a width direction of the electrode plate. The second separator film includes a second extension portion extending beyond the edge of the electrode plate along the width direction of the electrode plate. The tab is disposed on the electrode plate. The tab extends out of the separator from between the first extension portion and the second extension portion. A part of the first extension portion is connected to a part of the second extension portion to form sealing regions. There are at least two sealing regions. The sealing regions avoid the tab. The electrode assembly provided herein can effectively improve anti-drop performance of the battery cell.

This application provides an electrochemical device and an electronic device, where the electrochemical device includes an electrode assembly and an electrolyte, where the electrode assembly includes a negative electrode plate, the negative electrode plate includes a negative electrode active material layer, the negative electrode active material layer includes a negative electrode active material and a negative electrode binder, the negative electrode binder includes an ester substance and a non-ester substance, and based on a mass of the negative electrode binder, a mass percentage of the ester substance is x; the electrolyte includes fluoroethylene carbonate and a high-kinetic solvent, the high-kinetic solvent includes at least one of ethyl propionate, propyl propionate, or diethyl carbonate, and a ratio of a mass percentage of fluoroethylene carbonate to a mass percentage of the high-kinetic solvent in the electrolyte is y; and the electrochemical device satisfies: 17% ≤ x + y ≤ 53%, y is from 0.4% to 14%, and based on a mass of the electrolyte, a mass percentage of fluoroethylene carbonate is from 0.1% to 10%. By synergistically controlling x and y, this application mitigates volume expansion and capacity fade during cycling in fast-charging systems, thereby improving cycle performance.

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