Abstract: Disclosed are an electrode assembly and a battery. The electrode assembly includes a positive electrode plate formed through winding, where the positive electrode plate includes a positive electrode current collector, a first protective layer, and a positive electrode active material layer. The positive electrode current collector includes a first surface close to a winding center and a second surface away from the winding center. The second surface includes a first region and a second region. The first surface and the first region are provided with the first protective layer and the positive electrode active material layer, and the first protective layer is located between the positive electrode active material layer and the positive electrode current collector. The second region is provided with the first protective layer. The first protective layer includes a conductive material and a first binder.

Abstract: Disclosed are an electrode plate and a battery. The electrode plate includes a current collector, a tab, and an adhesive paper; the tab is disposed in the tab welding region the electrode plate is divided into a plurality of planar regions and curved surface regions that are alternately disposed; the adhesive paper covers the tab welding region, partially covers a planar region, crosses over an adjacent curved surface region on one side, and partially covers an adjacent planar region; and a projection of the adhesive paper on the adjacent planar region has a dimension L1, and 0<L1?10 mm. The electrode plate in the present disclosure can solve a problem of poor flatness near a tab, and can solve a lithium deposition problem caused by the poor flatness near the tab.

Abstract: Provided are an electrode assembly and a battery. The electrode assembly includes a positive electrode piece formed by winding, including a positive electrode current collector and a functional layer, where the positive electrode current collector includes a first surface and a second surface which are parallel and opposite to each other, and the first and second surfaces of the positive electrode current collector are each provided with a functional layer; a length of the functional layer is the same as that of the positive electrode current collector; the functional layer includes a positive electrode active material layer, and a protective layer which is arranged between the positive electrode current collector and the positive electrode active material layer, and a length of the protective layer is smaller than or equal to that of the positive electrode active material layer; the protective layer includes a conductive material and a binder.

Abstract: The present application provides a laminated battery cell and a lithium-ion battery, where the laminated battery cell includes an electrode sheet assembly and a protection assembly, where the protection assembly is located on the surface of the outer electrode sheet of the electrode sheet assembly; the electrode sheet assembly includes at least one functional electrode sheet, which includes a first current collector, a first protective layer and a first active layer, the first protective layer being located between the first current collector and the first active layer; the protection assembly includes a second current collector and a second protective layer that is away from the electrode sheet assembly; the first protective layer and the second protective layer each independently include a conductive particle and a binder, preventing the lithium-ion battery from internal short circuit during mechanical abuse, and making the lithium-ion battery has excellent safety performance.

Abstract: A positive electrode plate includes a positive electrode active layer, and a protective electrode protective layer arranged between a positive electrode current collector and the positive electrode active layer; the positive electrode protective layer includes conductive particles and a binder; and the conductive particles are an inorganic filler with a conductive coating layer on a surface. The positive electrode protective layer is arranged to avoid a contact-type short circuit between the positive electrode current collector and a negative electrode active layer when a lithium-ion battery is mechanically abused. In addition, there is a wide conductive network in the positive electrode protective layer, so the lithium-ion battery has excellent safety performance and cycling performance.

Abstract: A laser wireless power transmission device and method based on power acquisition on power line. The device includes a power transmitter and a power receiver both installed on a power transmission line. The power transmitter includes an online induction power acquisition module, a semiconductor laser, a communication module, a two-dimensional pan-tilt, a beam shaping module, a control unit, a video image module, and an IMU module. The power receiver includes a four-quadrant photovoltaic panel, a DCDC module, a wireless monitoring module, and a battery.

Abstract: A winding battery includes a positive electrode plate and a negative electrode plate which are formed by winding, the positive electrode plate includes a positive electrode current collector and a first coating layer, and the negative electrode plate includes a negative electrode current collector and a negative electrode active layer. The first coating layer includes a first insulating adhesive layer and a positive electrode active layer, the positive electrode active layer is disposed on a surface of the positive electrode current collector, the first insulating adhesive layer is connected to the positive electrode active layer, and at least one cross section of the first insulating adhesive layer and an end surface, close to a winding start point, of the negative electrode active layer are located in a same plane.

Abstract: A negative electrode sheet, including a negative current collector, where a first negative electrode film layer is attached to a surface of the negative current collector, and an active substance of the first negative electrode film layer includes silicon particles and hard carbon particles; a second negative electrode film layer is attached to a surface of the first negative electrode film layer, and an active substance of the second negative electrode film layer includes graphite particles, such that when lithium-ions move to the negative electrode sheet, part of lithium-ions are first embedded into the second negative electrode film layer, and the remaining lithium-ions are embedded into the first negative electrode film layer.

Abstract: A negative electrode sheet, including a negative current collector, where a first negative electrode film layer is attached to a surface of the negative current collector, and an active substance of the first negative electrode film layer includes silicon particles and first graphite particles; a second negative electrode film layer is attached to a surface of the first negative electrode film layer, and an active substance of the second negative electrode film layer includes second graphite particles. That is, a negative electrode film layer is divided into two layers, such that when lithium-ions move to the negative electrode sheet, part of lithium-ions are first embedded into the second negative electrode film layer, and the remaining lithium-ions are embedded into the first negative electrode film layer.

Abstract: A memory management method for a memory storage device is provided. The memory management method includes: detecting effective information of at least one operation event performed by the memory storage device in a first mode; and adjusting a threshold value according to the effective information. The threshold value is configured to determine whether to instruct the memory storage device to enter the first mode.

Abstract: The present application provides a rolled core and a battery, where the rolled core includes a positive electrode piece having a paste-removal portion of positive electrode piece, and a negative electrode piece including a negative current collector, a negative active material layer, and a gap filling body; the paste-removal portion of positive electrode piece is a missing part of the positive electrode piece relative to the negative electrode piece at a winding-start end of the rolled core; the negative current collector includes a first side and a second side which are opposite to each other, and at least one of the first side and the second side is provided with a negative active material layer; the gap filling body is arranged on one of the first side and the second side at a position corresponding to the winding-start end of the rolled core.

Abstract: This application provides an electrode sheet and an electrochemical device. The electrode sheet includes a current collector and a functional coating located on at least one surface of the current collector. The functional coating includes a first coating, a second coating and an active material layer that are sequentially stacked on a surface of the current collector. The first coating includes a conductive agent, a binder and a first functional filler, and the second coating includes a conductive agent, a binder and a second functional filler. A mass ratio of the binder in the first coating to the first coating is a1, a mass ratio of the binder in the second coating to the second coating is a2, and a mass ratio of the binder in the active material layer to the active material layer is a3, and a1>a2>a3.

Abstract: This application provides an electrode sheet and an electrochemical device. The electrode sheet includes a substrate. The substrate includes a current collector and a protective layer provided on a surface of the current collector. An active material layer is further provided on the protective layer. The protective layer includes a non-active material including an inorganic material. The inorganic material has a weight loss rate of a measured by a thermogravimetric analysis, where 0.1%?a?10%, a=(m0?m1)/m0, m0 is a mass of the inorganic material before the thermogravimetric analysis, and m1 is a mass of the inorganic material after the thermogravimetric analysis. The mass after the thermogravimetric analysis is a mass of the inorganic material when its temperature is raised from 25±5° C. to 900±20° C. at a heating rate of 20±2° C./min under an inert atmosphere.

Abstract: Disclosed are a battery and an electronic device, where the battery includes a first electrode plate, a second electrode plate, a control unit, and a first tab and a second tab that are connected to the first electrode plate, and the first electrode plate and the second electrode plate have opposite polarities. The control unit includes a heating control circuit, and in a case that the battery is connected to an external power supply, the heating control circuit is configured to: when a battery temperature of the battery is less than a first temperature threshold, conduct the first tab, the first electrode plate, and the second tab to heat the battery. A charging speed of the battery at a low temperature may be improved, and lithium deposition and capacity fading of the battery may be slowed down.

Abstract: An electrode piece, a rolled core and a battery, where the electrode piece includes a current collector and an active substance layer; the electrode piece has a single-sided area and a double-sided area, the single-sided area is located on a side of the electrode piece along a length direction thereof, a surface of one side of the current collector in the single-sided area is covered with the active substance layer, while surfaces of both sides of the current collector in the double-sided area are covered with the active substance layer; and multiple tabs protrude from one side of the electrode piece along a width direction thereof, and are spaced apart; in the single-sided area, an anti-rolling strip is provided on a surface of a side of the current collector not covered by the active substance layer, and is disposed on the same side as the tabs.

Abstract: A 3D printing device includes a liquid bath configured to contain liquid resin and having a main area and an extending area; a printing platform configured to carry a printed sample and inserted into the main area; and a release film assembly including a release film and a release film driving unit for driving the release film to move horizontally between the main area and the extending area. The invention has the following beneficial effects: 1, various errors caused by use of a quick levelling component such as a hub are eliminated, thus improving the printing quality; 2, an accurate printing thickness can be obtained by horizontally pushing printing liquid once by the release film, thus improving the printing efficiency; and 3, when the printing platform is assembled or disassembled, the release film can move to the extending area and does not need to be disassembled, so operation is simplified.

Abstract: Disclosed are a positive electrode plate and a battery. A relationship is established between a thickness of an electrode plate, distribution of lithium cobalt oxide with a structure of different contents of element aluminum, and full battery cycling performance. That is, based on a thickness of the electrode plate, lithium cobalt oxide with an appropriate content of the element aluminum is selected, and distribution in a thickness direction of the positive electrode plate is changed, so that the content of Al in the thickness direction of the electrode plate generally presents a distribution trend of less content of Al in a bottom layer and more content of Al in a top layer. In this way, a problem of deterioration of high temperature cycling of a lithium-ion battery due to decreased structural stability of existing lithium cobalt oxide may be solved.

Abstract: A 3D printing device includes a liquid bath, a printing platform, a release film assembly, a levelling hob assembly, and a bubble scraper. One side of the liquid bath is widened to form an extending area. The bubble scraper is disposed in the extending area, fixed at the bottom of the extending area, and located at a side close to a main area. The release film assembly and the levelling hob assembly are capable of moving horizontally. The invention has the following beneficial effects: 1. manual operations before and after printing are reduced and simplified; 2. the risk of damage to a levelling hob caused by frequent manual assembly and disassembly is lowered, and the waste of time caused by repeated levelling of the hob due to reassembly of the levelling hob is reduced; 3. the risk of contamination caused by dripping of the liquid resin is lowered.

Abstract: A device for keeping the liquid level constant during 3D printing includes a liquid bath for containing printing liquid, a printing platform for carrying a printed sample, a liquid level counterbalance inserted into the liquid bath, and a link mechanism connected with the printing platform and the liquid level counterbalance respectively for driving the liquid level counterbalance to ascend when the printing platform descends. The printing platform is inserted into the liquid bath and driven by a lifting device to ascend or descend. The printing platform and the liquid level counterbalance are in a relationship that a volume of a portion of the printing platform immersed into the printing liquid due to descending of the printing platform is equal to a volume of a portion of the liquid level counterbalance leaving the printing liquid due to rising of the liquid level counterbalance caused by descending of the printing platform.

Abstract: A laser wireless power transmission device and method based on power acquisition on power line. The device includes a power transmitter and a power receiver both installed on a power transmission line. The power transmitter includes an online induction power acquisition module, a semiconductor laser, a communication module, a two-dimensional pan-tilt, a beam shaping module, a control unit, a video image module, and an IMU module. The power receiver includes a four-quadrant photovoltaic panel, a DCDC module, a wireless monitoring module, and a battery.