Abstract: A coating roller assembly for coating an electrode plate of a battery, where the coating roller assembly includes: coating rollers; and coating portions, disposed around the coating rollers. The coating portions include a first coating portion, a second coating portion, and a third coating portion, where the first coating portion is configured to form a first coating layer portion, the second coating portion is configured to form a second coating layer portion, and the third coating portion is configured to form a third coating layer portion between the first coating layer portion and the second coating layer portion. A coating method for coating an electrode plate of a battery with the foregoing coating roller assembly, an electrode plate obtained through the coating roller assembly or the coating method, and a battery including the electrode plate.

Abstract: Embodiments of this application provide an electrode assembly, a battery cell, a battery, an electric device, and a method for manufacturing a separator, and pertain to the field of battery technologies. The electrode assembly includes a positive electrode plate, a negative electrode plate, and a separator, and the separator is disposed between the positive electrode plate and the negative electrode plate; and the separator includes a first section, a second section, and a third section arranged sequentially in a width direction of the separator, and a porosity of the second section is less than both a porosity of the first section and a porosity of the third section. The electrode assembly provided by the embodiments of this application includes a separator with different porosities in different sections, which can alleviate precipitation of metal ions in the electrode assembly.

Abstract: A spreader sprayer includes a frame, a walking device, a spreading device, a spraying device and a controller assembly. The walking device includes a walking driving part. The spreading device includes a spreading driving part. The spraying device includes a spraying driving part. The controller assembly is electrically connected with the walking driving part, the spreading driving part and the spraying driving part respectively. The disclosure uses a power battery as a power source of a whole vehicle. The controller assembly can respond to user's operation to control a movement of the walking device, the spreading device and the spraying device.

Abstract: Provided are a negative electrode plate and a preparation method thereof, a secondary battery, a battery module, a battery pack, and an electric apparatus. The negative electrode plate includes a negative electrode current collector and a negative electrode film layer disposed on at least one surface of the negative electrode current collector, where the negative electrode film layer includes a negative electrode active material layer, a lithium supplement layer, and a polymer layer that are stacked. The negative electrode active material layer is located on the negative electrode current collector, the lithium supplement layer is located on a side of the negative electrode active material layer back away from the negative electrode current collector, and the polymer layer is located on a side of the lithium supplement layer back away from the negative electrode active material layer.

Abstract: This application provides a method for capacity recovery of lithium-ion secondary battery. The method includes the following steps: (1) providing a capacity-degraded lithium-ion battery; (2) providing a capacity recovery agent, the capacity recovery agent including a lithium iodide and an organic solvent, and the organic solvent being used to dissolve the lithium iodide; (3) injecting the capacity recovery agent into the capacity-degraded lithium-ion battery; (4) enabling the capacity recovery agent to react inside the lithium-ion battery; and (5) pouring out the liquid mixture inside the reacted lithium-ion battery and injecting an electrolyte into the lithium-ion battery.

Abstract: Provided are a secondary battery and a preparation method thereof, and an electric device. The secondary battery includes a negative electrode plate and an electrolyte. The negative electrode plate includes a negative active material and a lithium supplement agent, and an insulating material is dissolved in the electrolyte. A mass ratio of the insulating material in the electrolyte ranges from 0.1% to 4%. The insulating material is derived from the negative electrode plate prior to injection the electrolyte, and the insulating material is arranged between the negative active material and the lithium supplement agent in the negative electrode plate prior to the injection the electrolyte.

Abstract: A battery cell includes a casing configured to accommodate an electrode assembly, and a pressure relief mechanism disposed on the casing. The pressure relief mechanism includes a pressure relief passage, and a first pressure relief element and a second pressure relief element that are disposed on the pressure relief passage and close the pressure relief passage separately. In a venting direction of the pressure relief passage, the second pressure relief element is disposed upstream of the first pressure relief element and communicated with an internal space of the casing. The second pressure relief element has a rigidity of greater than or equal to 25 N/mm.

Abstract: This application provides a jelly-roll electrode assembly, a battery cell, a battery, an electrical device, and a method and equipment for manufacturing the jelly-roll electrode assembly. The application relates to the field of battery technology. The jelly-roll electrode assembly includes a positive electrode plate. The positive electrode plate includes a positive current collector and a first positive active material layer disposed on an inner surface of the positive current collector. The positive electrode plate includes a plurality of layers of bend portion located in a bend region and arranged sequentially from inside to outside. The first positive active material layer includes a plurality of first positive active material portions located in the plurality of layers of bend portion. A plurality of first grooves are created in at least one of the first positive active material portions.

Abstract: An electrode assembly and a lithium-ion battery are described. The electrode assembly includes a positive electrode plate, a separator, and a negative electrode plate, where the negative electrode plate includes a negative electrode current collector and a negative electrode active substance layer, the negative electrode plate further includes a lithium metal layer, the lithium metal layer is formed by a plurality of regular or irregular strip-shaped lithium-rich regions, and the plurality of lithium-rich regions present a discontinuous pattern of spaced distribution in a length direction of the negative electrode plate. The electrode assembly further satisfies that: negative electrode capacity per unit area/positive electrode capacity per unit area=1.2 to 2.1 and negative electrode capacity per unit area/(positive electrode capacity per unit area+capacity of the lithium metal layer on the surface of the negative electrode active substance layer per unit area× 80%)? 1.10.

Abstract: A lithium-ion secondary battery includes a negative electrode sheet including a negative electrode current collector and a negative electrode film disposed on a surface of the negative electrode current collector and containing a negative active material, a positive electrode sheet including a positive electrode current collector and a positive electrode film disposed on a surface of the positive electrode current collector and containing a positive active material, and an electrolytic solution including lithium iodide, a lithium salt, a solvent, and an additive. A coating weight per unit area, CW1/S0, of the positive electrode film satisfies CW1/S0=((CW2/S0)×b×C2/CB?m×X×(199 mAh/g)/S)/(C1×a).