Abstract: Disclosed are a current collector, an electrode plate, and a battery. The current collector includes a substrate and a conductive coating layer coated on the surface of the substrate, where the conductive coating layer includes alternately arranged raised parts and recessed parts. A plurality of recessed parts are arranged on the conductive coating layer, which may increase the component of the coated active material without increasing the overall thickness, significantly increase the bonding strength of the active material and the conductive coating layer, and improve the conductivity; it can effectively inhibit the thickness expansion of the electrode plate, and solve the problem that the bonding strength of the carbon-containing layer and the active material in the prior art needs to be improved.

Abstract: The present disclosure provides an electrode sheet and a lithium-ion battery. A first aspect of the present disclosure provides an electrode sheet, including a current collector, and a first active layer and a second active layer which are sequentially stacked on a surface of the current collector; where, the first active layer is provided with a first groove, the second active layer is provided with a second groove, and a vertical projection of the second groove on the current collector covers a vertical projection of the first groove on the current collector; a tab is disposed at the first groove and is electrically connected with the current collector. The electrode sheet provided by the present disclosure effectively improves the charging risk at a tab connection position and increases the cycle retention rate of the lithium-ion battery under the condition of maintaining high-rate charging.

Abstract: Disclosed are a negative electrode plate and use thereof. For the negative electrode plate provided in the present disclosure, a negative electrode active layer is coated with a safety function layer containing metal and ceramic, which effectively improve an electrode potential of a negative electrode and a nucleation energy barrier of metal lithium of a lithium-ion battery in a charging process at a low temperature and a high rate, thereby avoiding occurrence of a lithium precipitation phenomenon at the negative electrode. Because of good heat insulation performance of the ceramic, occurrence of a thermal runaway phenomenon in a nail penetration test may be effectively avoided, and safety performance of the battery may be improved. When the negative electrode plate is applied to the lithium-ion battery, the obtained lithium-ion battery has advantages of good cycling performance and high security.

Abstract: An electrode plate includes a current collector, a first active layer, and a second active layer. The first active layer is disposed on a surface of the current collector and provided with a first groove, and the second active layer is divided into a first portion disposed in the first groove and a second portion disposed on a surface, away from the current collector, of the first active layer. The first portion is provided with a second groove, a tab is disposed at the second groove and is electrically connected to the current collector, and a thickness of the first portion of the second active layer is less than a total thickness of the first active layer and the second portion of the second active layer.

Abstract: The present disclosure provides an electrode piece and a battery. The electrode piece includes a current collector and a functional layer arranged on a first surface of the current collector, a tab is further arranged in middle of the first surface, and the functional layer on the first surface has a first slope area near the tab and a first normal area away from the tab, and a thickness of the first slope area gradually decreases along a direction towards the tab. The present disclosure can improve performances of the battery, such as rate capacity, safety and the like.

Abstract: The present disclosure provides an electrode piece and a battery. The electrode piece includes a current collector and a functional layer located on a first surface of the current collector, the first surface is provided with a tab, and the functional layer is composed of a normal area away from the tab and a recessed area near the tab, and a thickness of the recessed area is less than a thickness of the normal area. The present disclosure can effectively prevent problems such as excessive thickness of part of a cell near the tab, thereby improving battery qualities such as safety and charging/discharging rate.

Abstract: The present application provides a positive electrode plate and a lithium-ion battery. A first aspect of the present application provides a positive electrode plate, and the positive electrode plate includes a positive-electrode current collector, a functional layer, and a first safety coating; where both an upper surface and a lower surface of the positive-electrode current collector include a first coating area and a second coating area, and the first coating area is provided with the first safety coating; the second coating area is provided with the functional layer, and the functional layer sequentially includes a second safety coating and a positive-electrode active layer in a direction away from the positive-electrode current collector.

Abstract: A foldable electronic device includes a first portion, a second portion, and a hinge connecting the first portion and the second portion. The hinge is configured to allow pivoting movement of the first portion relative to the second portion, wherein the hinge has a hinge force. One or more magnets are coupled to the first portion, and a plurality of metal members are coupled to the second portion. Each metal member of the plurality of metal members is configured for individual removal from the second portion to define a magnetic force based on the hinge force, thereby allowing the first and second portions to be maintained together when in a closed orientation and allowing for easy one finger opening operation from the closed orientation.

Abstract: A foldable electronic device includes a first portion, a second portion, and a hinge connecting the first portion and the second portion. The hinge is configured to allow pivoting movement of the first portion relative to the second portion, wherein the hinge has a hinge force. One or more magnets are coupled to the first portion, and a plurality of metal members are coupled to the second portion. Each metal member of the plurality of metal members is configured for individual removal from the second portion to define a magnetic force based on the hinge force, thereby allowing the first and second portions to be maintained together when in a closed orientation and allowing for easy one finger opening operation from the closed orientation.