Amperex Technology Limited Patente

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A secondary battery includes a negative electrode plate, where the negative electrode plate includes a current collector and a first active material layer, the first active material layer is disposed on at least one surface of the current collector, the first active material layer includes a silicon-based material and a solid-state electrolyte, and the solid-state electrolyte is at least partially bound to a surface of silicon in the silicon-based material. In the secondary battery and an electric device, the solid-state electrolyte is at least partially bound to the surface of silicon in the silicon-based material, mitigating the issue of silicon-based material swelling and enhancing the structural integrity and stability of the negative electrode plate. In addition, as compared to a silicon-based material coated with a binder in the prior art, the use of a solid-state electrolyte can improve the lithium intercalation capability of the silicon-based material and increase the ion conduction rate in the negative electrode plate, thus mitigating the issue of deteriorated kinetic performance of the secondary battery caused by coating a binder on the silicon-based material.

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A secondary battery and an electronic device are disclosed. The secondary battery includes an electrode assembly and a negative tab. The electrode assembly includes a negative electrode plate. The negative electrode plate includes a negative current collector and a first negative active layer disposed on at least one surface of the negative current collector. The negative tab is integrally formed with the negative current collector and extends out of the electrode assembly along a first direction. The first negative active layer includes a first region corresponding to the negative tab in the first direction. The first region is provided with a plurality of strip-shaped grooves. In the first direction, the negative current collector includes a first edge located on the same side as the negative tab. Each of the strip-shaped grooves includes a first end located on the same side as the negative tab. A distance between the first end of at least one strip-shaped groove located in the first region and the first edge is greater than or equal to 0.

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A secondary battery and an electronic device are disclosed. The secondary battery includes an electrode assembly and a tab. The electrode assembly includes a negative electrode plate. The negative electrode plate includes a negative current collector and a negative active layer disposed on at least one surface of the negative current collector. The negative current collector includes a first edge and a second edge opposite to each other in a first direction. The tab extends out of the electrode assembly through the first edge along the first direction. The negative active layer includes a first edge region provided with a plurality of first strip-shaped grooves. The first edge region covers the first edge and extends toward the second edge. In the first direction, the first edge region includes a first end portion located at the first edge and a second end portion opposite to the first end portion. At least one of the first strip-shaped grooves extends from the first end portion to the second end portion. A width of the first edge region is greater than or equal to 1 mm.

This application relates to the technical field of electrochemical apparatuses, and in particular, to a secondary battery and an electric device. The secondary battery includes a negative electrode plate, where the negative electrode plate includes a current collector, a first active material layer, and a second active material layer, the first active material layer is disposed on at least one surface of the current collector, the second active material layer is disposed on a side of the first active material layer facing away from the current collector, the first active material layer includes a silicon-based material and a first graphite material, the second active material layer includes a second graphite material and an inorganic material, and a ratio of a particle size D_v50 of the inorganic material to a particle size D_v50 of the second graphite material is less than 0.23. The secondary battery and the electric device can improve the problem of overpressure of the second active material layer, suppression by the second active material layer on swelling of the silicon-based material can be maintained, and structural integrity and structural stability of the negative electrode plate can be enhanced.

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This application discloses a secondary battery and an electronic device. The secondary battery includes an electrode assembly, a packaging bag, and an insulation adhesive. The packaging bag includes a main portion and a first side seal edge. The main portion accommodates the electrode assembly, and includes a first sidewall and a second sidewall disposed along a thickness direction of the secondary battery. The first side seal edge includes a first connecting portion and a second connecting portion disposed in sequence. The first connecting portion is connected to the main portion. The second connecting portion is bent toward the main portion relative to the first connecting portion. An angle θ is formed between the first connecting portion and the first sidewall, satisfying: 0° < θ < 90°. A thickness of the main portion is less than a width of the first connecting portion. The insulation adhesive covers one end, facing the main portion, of the second connecting portion. The insulation adhesive bonds the first connecting portion to the second connecting portion, and further bonds the second connecting portion to the main portion. This application increases energy density. When sealing an end portion of the second connecting portion, this application reduces the risk of deformation of the first side seal edge.

The present application relates to the field of battery technologies and discloses a negative electrode plate, an electrochemical apparatus, and an electric device. The negative electrode plate includes a first active material layer, a first current collector, and a second active material layer; the first active material layer includes a first coating and a second coating disposed between the first coating and the first current collector, along a first direction, a first end of the second coating exceeds a first end of the first coating, such that the first active material layer has a first single-layer portion, and/or along a second direction, a second end of the second coating exceeds a second end of the first coating, such that the first active material layer has a second single-layer portion, where the first direction and the second direction are opposite. The negative electrode plate, along the first direction or the second direction, has the second coating exceeding the first coating, thereby addressing the issue that two end portions of the active material layer are prone to overpressure during the rolling process, which leads to damage to the first current collector. This reduces the probability of tape breakage during the rolling process of the negative electrode plate and improves the production yield of the negative electrode plate.

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