Abstract: Embodiments of the present application relate to the technical field of batteries, and provide a water cooling assembly, a battery pack, and a device in order to solve the technical problem of low cooling efficiency of a cooling assembly of a battery pack. The water cooling assembly is configured to cool a cell, and includes: a body portion having a cooling channel for receiving a coolant; a first connecting portion connected to the body portion and having a communication cavity for introducing or draining the coolant; and a second connecting portion arranged between the body portion and the first connecting portion and having an inner cavity for communicating the cooling channel with the communication cavity. An end face of the inner cavity close to the cooling channel has a cross-sectional area greater than that of an end face of the communication cavity close to the inner cavity.

Abstract: This application relates to the battery field, and specifically, to a positive electrode plate, an electrochemical apparatus, and an apparatus. The positive electrode plate in this application includes a current collector and an electrode active material layer disposed on at least one surface of the current collector, where the current collector includes a support layer and a conductive layer disposed on at least one surface of the support layer. A single-sided thickness D2 of the conductive layer satisfies 30 nm?D2?3 ?m. A thickness D1 of the support layer satisfies 1 ?m?D1?30 ?m. The support layer is made of a polymer material or a polymer composite material. The electrode active material layer includes electrode active materials, a binder, and a conductive agent.

Abstract: The present application relates to a composite material with a core-shell structure for battery, wherein the core is made of a core material including metallic copper or a copper-containing compound; the shell is made of a shell material including at least one of silicon dioxide and titanium dioxide; and the core material has an average particle size D50 of 0.01 ?m-5 ?m, optionally 0.1 ?m-3 ?m, and more optionally 0.1 ?m-2 ?m. The present application also relates to secondary battery containing the composite material, a battery module, a battery pack, and an apparatus.

Abstract: The present application discloses a negative electrode plate including a negative electrode active material layer including a first active material layer; wherein in a first cross section in a thickness direction of the negative electrode plate, the first active material has a size a in a direction parallel to the metal conductive layer, the first active material has a size b in the thickness direction, satisfying 0.8?a/b?20; in a second cross section in the thickness direction of the negative electrode plate, the first active material has a size c in the direction parallel to the metal conductive layer, the first active material has a size d in the thickness direction, satisfying 0.8?c/d?20; and the first cross section is parallel to a first direction, the second cross section is parallel to a second direction, and the first direction intersects the second direction.

Abstract: A battery pack for optimizing the structure of the battery pack includes a case, a battery module and a blocking member. The case includes an accommodating cavity and a drain hole in communication with the accommodating cavity. The battery module is contained inside the accommodating cavity. The blocking member is mounted to the case, and located between the drain hole and the battery module to block a binder for fixing the battery module from entering the drain hole. In the above-described technical solution, the blocking member can produce the effect of reducing or even avoiding binder for fixing the battery module from clogging in the drain hole.

Abstract: A battery module is provided including a battery unit that includes a battery top cover; a temperature measurement unit, including a temperature collection element to collect temperature of the battery top cover; a harness plate, arranged on the battery top cover and including a harness plate body and a limiting structure arranged on the harness plate body, wherein the limiting structure is matched with the temperature measurement unit; a circuit board, arranged on the harness plate and including a circuit board body and an extending strip arranged on the circuit board body, wherein the temperature collection element is connected with the extending strip; and an electrical connecting sheet arranged on the harness plate to connect different battery units, wherein the temperature measurement unit is arranged between the electrical connecting sheet and the battery top cover, and the electrical connecting sheet exerts pressure onto the temperature measurement unit.

Abstract: A battery formation apparatus includes a DC-DC conversion module, an additional power supply, and a control circuit. Low-voltage and high-voltage terminals of the DC-DC conversion module are electrically connected to the control circuit and a DC bus, respectively. The DC-DC conversion module is configured to, when a battery unit discharges into the battery formation apparatus, convert a first voltage input into a second voltage greater than the first voltage, and output the second voltage. The additional power supply is electrically connected to the control circuit, and configured to output an additional voltage. The control circuit is electrically connected to the battery unit, the low-voltage terminal of the DC-DC conversion module, and the additional power supply. The control circuit is configured to serially connect the low-voltage terminal of the DC-DC conversion module, the battery unit, and the additional power supply when the battery unit discharges into the battery formation apparatus.

Abstract: A battery assembly includes a protection member and a battery module including at least two batteries arranged side by side along a first direction and having a first outer surface and a second outer surface opposite to each other along a second direction. The protection member is in the form of a letter U with two vertical portions having different lengths, wherein a first protection section covers the end covers of batteries in the battery module, a part of a second protection section covers the first outer surface, and a third protection section abuts against an end cover of a battery corresponding to the second outer surface. The protection member can prevent the airflow, the flame and the like sprayed during thermal runaway, and control a thermal diffusion range during thermal runaway.

Abstract: Embodiments provide a battery cell, a battery, an electric apparatus, and a manufacturing method and system of battery cell. In those embodiments, the battery cell includes a housing, an electrode assembly, and an end cover assembly. The housing provides an opening. The electrode assembly is disposed in the housing. The electrode assembly includes a body portion and a tab. The tab extends from an end of the body portion to the opening. The electrode assembly includes a first electrode plate, a second electrode plate, and a separator. The first electrode plate and the second electrode plate each have a coated area and an uncoated area. A part of the electrode assembly corresponding to the coated areas of the first electrode plate and the second electrode plate is the body portion. The uncoated area of the first electrode plate or the second electrode plate forms the tab.

Abstract: The present application relates to a method, apparatus and system for inspecting a cell crush, a computer device, a storage medium, and a computer program product. The method may include: acquiring images of a flowing cell assembly by a high-speed image acquisition device; extracting image features from the images of the cell assembly; performing similarity matching between the image features and a preset crush model to obtain a similarity matching result; and obtaining a cell crush inspection result based on the similarity matching result.

Abstract: This application provides a winding and unwinding device and a battery production system. The winding and unwinding device includes a turret, a driver, and a magnetic powder clutch. The turret includes a rotation shaft and at least one winding shaft, the rotation shaft being parallel to the winding shaft. A drive shaft of the magnetic powder clutch is connected to the driver and a driven shaft of the magnetic powder clutch is connected to the rotation shaft of the turret, such that the driver drives the rotation shaft of the turret to rotate. In this application, with the magnetic powder clutch disposed between the turret and the driver, after the turret rotates to a predetermined position, the rotation of the turret can be stopped without the need to cut off the power supply, ensuring the normal operation of the driver when the turret stops rotation, thus avoiding damage to the driver.

Abstract: Some embodiments of this application disclose a method and device for locating a target region on an image, and a computer-readable storage medium. The method includes: obtaining coordinates of target points in a to-be-detected image based on a feature point recognition model; and locating the target region based on the coordinates of the target points. The to-be-detected image includes an unstably imaged target region. A target object in the target region includes a stably imaged first section and an unstably imaged second section. The target points include a feature point on the first section. The method can improve accuracy and efficiency of locating the target region.

Abstract: This application relates to the field of battery technology, and in particular, to a box assembly, a battery module, a battery, and an electrical device. The box assembly may include at least a partition piece and two end plates. In the box assembly disclosed herein, a stress relief piece may be disposed at two ends of a main body of the partition piece. The main body may be connected to the end plate by use of the stress relief piece. A corner may be formed between the stress relief piece and the main body. In this way, when the battery module is subjected to stress, at least a part of the stress can be relieved through the corner formed between the stress relief piece and the main body.

Abstract: The present application relates to a battery cell manufacturing device and method. The battery cell comprises an electrode sheet and a separator. The electrode sheet has a free end in its own extension direction. The battery cell manufacturing device includes a winding pin and a lamination assembly. The winding pin is configured to wind the electrode sheet and separator into a battery cell. The lamination assembly is disposed upstream of the winding pin, and configured to connect the free end of the electrode sheet to the separator. The battery cell manufacturing device and method provided in the embodiments of the present application solve the problem that the free end of the electrode sheet is prone to shift relative to the separator during the battery cell production process, thus ensuring the safety of the battery cell produced.

Abstract: Embodiments of this application provide a method for detecting a target point in an image. The method may include: obtaining an image under test, where the image under test may include a structure-stable first target object and a structure-unstable second target object; and processing the image under test based on a target point detection model to obtain a target point in the image under test, where the target point may include a feature point on the structure-stable first target object and a feature point on the structure-unstable second target object.

Abstract: An image processing method includes searching for a next pixel of a skeleton branch of a target image based on an already-searched current pixel of the skeleton branch, and determining whether the skeleton branch is a burr branch based on a number of already-searched pixels of the skeleton branch.

Abstract: This application discloses a rewinding apparatus and a rewinding method. The rewinding apparatus is configured to rewind a strip. The rewinding apparatus includes a rewinding mechanism and a switching mechanism. The rewinding mechanism includes two shafts that are opposite to each other along a first direction and spaced out. The two shafts are configured to rewind the strip along different conveyance paths separately. The switching mechanism includes a moving roller. The moving roller is configured to drive the strip to switch from one shaft to another shaft so that the strip switches from one conveyance path to another conveyance path. The rewinding apparatus and rewinding method disclosed in this application achieve high space efficiency and high switching efficiency.

Abstract: The present application provides a perovskite solar cell, including conductive glass, a hole transport layer, a perovskite layer, an electron transport layer and a back electrode, where a passivation layer may be disposed between the hole transport layer and the perovskite layer, and the passivation layer may include an amide and/or a cation thereof, where the amide may include a compound of formula (1) and/or formula (2): where R1 and R2 are each independently selected from hydrogen, —R, —NR2, —NHR, —NH2, —OH, —OR, —NHCOR, —OCOR, and —CH2COOH, where R represents a straight or branched chain alkyl group having 1-10 carbon atoms, m is an integer of 0 to 10; and n is an integer of 1 to 10; and where Ar is selected from a C5-C10 aryl or heteroaryl group.

Abstract: A method and an apparatus for inspecting tab appearance of cell assembly, an electronic device, a non-transitory computer-readable storage medium, and a computer program product are provided. The method includes: obtaining an image for inspection that includes a background region and a cell assembly image region, where the cell assembly image region includes a body zone and a plurality of tab stacking regions, each tab stacking region adjoining a top edge or a bottom edge of the body zone; determining each root corner of the plurality of tab stacking regions in the image for inspection; determining two side edges of the body zone in the image for inspection; determining at least one reference edge line in the image for inspection based on the two side edges of the body zone in the image for inspection; and determining result information of the tab appearance inspection based on each root corner of the plurality of tab stacking regions in the image for inspection and the at least one reference edge line.

Abstract: This application relates to a cover assembly of a secondary battery. The cover assembly includes a cover plate with an air hole; a blocker inserted into and blocking the air hole; a sealing member disposed between the blocker and the cover plate configured to seal a gap between the blocker and the cover plate; and a fastener disposed inside the air hole. The fastener is connected to the cover plate, the blocker is connected to the cover plate through the fastener. The fastener is configured to deform in response to a temperature rise, so that the blocker stops blocking the air hole. The blocker stops blocking the air hole as a temperature inside a housing rises, to discharge gas from the housing through the air hole. In this way, the secondary battery can be prevented from an explosion, while partial heat is taken away through gas discharge.