Abstract: A solar cell, including a crystalline silicon substrate; a first passivation contact step provided on a surface of the crystalline silicon substrate; a second passivation contact step provided on a surface of the first passivation contact step away from the crystalline silicon substrate and located corresponding to an electrode; a first passivation antireflection step provided on the surface of the first passivation contact step away from the crystalline silicon substrate and not in contact with the second passivation contact step; a second passivation antireflection step provided on a surface of the second passivation contact step away from the first passivation contact step; and the electrode including a side in contact with the first passivation contact step and another side penetrating through the second passivation contact step and the second passivation antireflection step.

Abstract: Embodiments of this application provide a battery and an electric apparatus, where the battery includes: a plurality of battery cells; a heat exchange pad, disposed between two adjacent battery cells and configured to exchange heat with the battery cells; and a cooling pipe, configured to deliver cooling fluid, and the cooling pipe is provided with a plurality of outlets. The heat exchange pad is provided with inlets corresponding to the outlets, and the cooling pipe is configured to deliver the cooling fluid to the inlets of the heat exchange pad through the outlets. A flow channel that communicates with the inlets is further provided on the heat exchange pad, and the flow channel is configured to accommodate the cooling fluid to exchange heat between the cooling fluid and the battery cells. The technical solutions of the embodiments of this application can enhance the safety of the battery.

Abstract: In an example embodiment, a skip logic using downsampling is applied to negative signals on a training data set fed to a machine-learning algorithm to train a machine-learned model. By downsampling the negatively labeled pieces of training data, the technical problem encountered in biasing the machine-learned model towards negative cases is overcome.

Abstract: A positive electrode composite material includes a first type of material and at least one of a second type of material or a third type of material. The first type of material is a lithium iron phosphate material. The second type of material is ABb, where A is at least one selected from Fe, Mn, Co, Ni, Ti, V, Nb, Ta, Zr, Hf, Cr, Mo, W, Re, Pt, Sn, Pb, and Sb, B is any one selected from S and Se, and a value of b is in a range of 1-4. The third type of material is a two-dimensional metal carbide, nitride, or carbonitride MXene material of formula Mn+1Xn or Mn+1XnTx, where M is a transition metal element, X is C element and/or N element, Tx represents a surface functional group including -O, —OH, -Cl, or -F. The third type of material has a layered structure, and n represents a number of layers and n = 1, 2, or 3.

Abstract: The present invention relates to a positive electrode plate and an electrochemical device. The positive electrode plate comprises a current collector, a positive active material layer and a safety coating disposed between the current collector and the positive active material layer, and wherein the safety coating comprises a polymer matrix, a conductive material and an inorganic filler and wherein when the safety coating and the positive active material layer are collectively referred as a film layer, the film layer has an elongation of 30% or more and wherein the polymer matrix of the safety coating is fluorinated polyolefin and/or chlorinated polyolefin having a crosslinked structure. The positive electrode plate may improve the safety performance during nail penetration of the electrochemical device such as capacitor, primary battery or secondary battery and the like.

Abstract: A battery cell may include a housing, an electrode assembly, and a pole. The housing may be integrally formed and include two first side walls arranged opposite each other in a first direction and two second side walls arranged opposite each other in a second direction, the two first side walls and the two second side walls may enclose an accommodating cavity, the housing may have at least one opening in a third direction, and the first direction, the second direction, and the third direction are perpendicular to one another. The electrode assembly may be accommodated in the accommodating cavity, and the electrode assembly may include a body structure and a tab protruding out of the body structure.

Abstract: Disclosed is an insulating film, a battery cell, a battery, a method for preparing a battery cell, a device for preparing a battery cell, and an electrical device, wherein the insulating film includes a bottom coverage region and a plurality of alternately arranged first side coverage regions and second side coverage regions; the plurality of first side coverage regions and second side coverage regions are all located on the same side of the bottom coverage region; the first side coverage region includes a bottom masking portion and two side overlapping portions stacked on the bottom masking portion; a first guide groove is formed at the junction of the bottom masking portion and the side overlapping portion, a second guide groove corresponding to the first guide groove is arranged on the side overlapping portion, the second guide groove intersects with the first guide groove, and is set to incline downward.

Abstract: A battery cell may include a housing, a first body structure, and a second body structure. The first body structure may be disposed in the housing. The first body structure may include a first positive electrode plate and a first negative electrode plate. A second body structure may be disposed in the housing. The second body structure may include a second positive electrode plate and a second negative electrode plate. The first body structure and the second body structure may be spaced out along a first direction. An end of the first positive electrode plate, which is oriented away from the second body structure along the first direction, may protrude beyond the first body structure and contacts a first inner surface of the housing, and the first negative electrode plate may be insulated from the first inner surface of the housing.

Abstract: An adapter may include a first adapter and a second adapter disposed discretely. The first adapter may be configured to be connected to one of an electrode post or a tab. The second adapter may be configured to be connected to the other of the electrode post or the tab. The first adapter may substantially extend along a first direction. The second adapter may substantially extend along a second direction. The first direction may intersect the second direction. The first adapter may be connected to the second adapter by a conductive structure.

Abstract: A battery cell may include a housing, a first electrode assembly, and a second electrode assembly. The first electrode assembly may be disposed in the housing. The first electrode assembly may include a first body structure, and a first positive tab and a first negative tab that extend from the first body structure. The second electrode assembly may be disposed in the housing. The second electrode assembly may include a second body structure, and a second positive tab and a second negative tab that extend from the second body portion. The first body structure and the second body structure may be spaced out along a first direction.

Abstract: This application relates to a battery comprising a positive electrode plate, a separator, and a negative electrode plate, wherein the positive electrode plate comprises a positive electrode current collector and at least two layers of positive active material coated on at least one surface of the positive electrode current collector, and wherein an underlying positive active material layer in contact with the positive electrode current collector comprises a first positive active material, a first polymer material and a first conductive material; and wherein an upper positive active material layer in contact with the underlying positive active material layer and away from the positive electrode current collector comprises a second positive active material, a second polymer material and a second conductive material, and the first polymer material comprises fluorinated polyolefin and/or chlorinated polyolefin polymer material. The battery has good safety and improved electrical properties.

Abstract: A battery cell, a battery, an electrical apparatus, and a manufacturing method for a battery cell are disclosed. The battery cell includes an electrode assembly, and the electrode assembly includes a main body part and a tab extending from the main body part. The tab includes a first bending portion and a straight portion, and the straight portion is connected to the main body part through the first bending portion; a second bending portion is formed on the straight portion, and the second bending portion protrudes towards the side of the main body part. The arrangement of the second bending portion generates a protruding deformation towards the side of the main body part, which makes the layers of the tab close together, forming a local binding of the tab, and increasing the resistance to separation between the layers of the tab, thereby improving the safety of the battery.

Abstract: Provided are a solar cell and a photovoltaic module. The solar cell includes: a silicon substrate; a passivation layer provided on a surface of the silicon substrate; a first electrode conductor at least partially arranged on the passivation layer and including a body portion and protruding portions located on two ends of the body portion; and a second electrode conductor at least partially arranged on the passivation layer and at least partially overlapping with the protruding portions. A length of each of the protruding portions in a width direction of the body portion is greater than a width of the body portion.

Abstract: The disclosed embodiments provide a system for processing data. During operation, the system performs processing related to a first set of features for a first entity using a first series of embedding layers, wherein the processing includes applying each embedding layer in the first series of embedding layers to a concatenation of all outputs of one or more layers preceding the embedding layer. Next, the system obtains a first embedding as an output of a first final layer in the first series of embedding layers. The system then outputs the first embedding for use by a machine learning model.

Abstract: Provided are a solar cell, a method for manufacturing a solar cell and a photovoltaic module. The solar cell includes a semiconductor substrate including a surface having a first texture structure and a first passivation layer located on the first texture structure of the semiconductor substrate. The first texture structure includes a pyramid-shaped microstructure, a length of a bevel edge of the pyramid-shaped microstructure is C ?m, and 0.4?C?1.9. A non-uniformity of the first passivation layer is N?4%, and N=(Dmax?Dmin)/Dmax. Dmax is a maximum thickness of the first passivation layer on the pyramid-shaped microstructure, and Dmin is a minimum thickness of the first passivation layer on the pyramid-shaped microstructure.

Abstract: A solar cell, a manufacturing method therefor, and a photovoltaic module are provided. The solar cell includes a substrate having a front surface and a rear surface, a passivation stack disposed on the front surface, and a tunneling oxide layer and a doped conductive layer disposed on the rear surface. The passivation stack includes an oxygen-containing dielectric layer, a first passivation layer and a second passivation layer. The first passivation layer includes a first interface adjacent to the oxygen-containing dielectric layer and a second interface adjacent to the second passivation layer, the second passivation layer includes a third interface opposite to the second interface, a nitrogen content and a silicon content at the second interface are higher than those at the first interface and the third interface, respectively, and an oxygen content at the second interface is lower than that at the first interface and the third interface, respectively.

Abstract: A solar cell, a method for producing a solar cell and a solar cell module are provided. The solar cell includes: a substrate having a front surface and a rear surface opposite to the front surface; a first passivation layer, a second passivation layer and a third passivation layer sequentially formed on the front surface and in a direction away from the front surface; wherein the first passivation layer includes a dielectric material; the second passivation layer includes a first silicon nitride SimNn material, and a ratio of n/m is 0.5˜1; the third passivation layer includes a silicon oxynitride SiOiNj material, and a ratio of j/i is 0.1˜0.6; and a tunneling oxide layer and a doped conductive layer sequentially formed on the rear surface and in a direction away from the rear surface, wherein the doped conductive layer and the substrate have a doping element of a same conductivity type.

Abstract: Technologies for generating a graph containing clusters of feature attribute values for training a machine learning model for content item selection and delivery are provided. The disclosed techniques include, for each entity, of a plurality of entities, a system identifies transitions from one geographic location to another geographic location. A graph is generated based on the transitions associated with each entity. The graph comprises nodes representing geographic locations and edges connecting the nodes. Each of the edges connects two nodes, represents a transition from one geographic location to another geographic location, and each edge represents an edge weight value that is based on frequencies of transitions between geographic locations represented by the two connected nodes. The system generates a plurality of clusters from the nodes based upon the edge weight value of each edge. The system includes the plurality of clusters as features in a machine learning model.

Abstract: Disclosed embodiments may include a method that may include receiving a corpus of unlabeled text documents, generating, using the first machine learning model, a first classification of each unlabeled text document in the corpus of unlabeled text documents as positive or negative, defining, using the first machine learning model and based on the first classification, a first subset of the unlabeled text documents and a second subset of the unlabeled text documents, generating, using the second machine learning model, a second classification of each unlabeled text document in the first subset of the unlabeled text documents as positive or negative, generating, using the third machine learning model, a third classification of each unlabeled text document in the second subset of the unlabeled text documents as positive or negative, and modifying the first classification, based on the second classification and the third classification, to create a fourth classification.