Abstract: Embodiments of the present invention disclose a reference signal transmission method, including: sending, by a terminal, a first reference signal and a second reference signal; and correspondingly, receiving, by a network device, the first reference signal and the second reference signal, where the first reference signal is mapped to a plurality of symbols and is used for estimation of channel state information, the second reference signal is mapped to at least two of the plurality of symbols and is used for phase tracking, and a subcarrier to which the second reference signal is mapped on one of the at least two symbols has a same frequency-domain location as a subcarrier to which the second reference signal is mapped on the rest of the at least two symbols. With the foregoing solution, accuracy of channel state information estimation can 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: 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: Disclosed are an Internet of Things (IoT) based method and system for interacting with users. The intelligent customer service system collects and stores real-time status information of at least one device in an IoT; receives a request of a user; queries a device knowledge graph according to content of the request, and invoke the real-time status information of a related IoT device to acquire a corresponding request result, wherein the device knowledge graph is established according to usage information and/or maintenance information of one or more IoT devices; and return the request result to the user.

Abstract: The objective of the present disclosure is to provide an Internet of Things (IoT) based method and system for interacting with users. The intelligent customer service system collects and stores real-time status information of at least one device in an IoT; receives a request of a user; queries a device knowledge graph according to content of the request, and invoke the real-time status information of a related IoT device to acquire a corresponding request result, wherein the device knowledge graph is established according to usage information and/or maintenance information of one or more IoT devices; and return the request result to the user. Compared with the prior art, the present disclosure enables the user to acquire a better customer service experience.