EVE Power

The invention provides a battery and an electrical device. The battery includes a connection member and a package member, where the connection member (2) has an electrode lead-out portion (201) for connecting an electrode of the battery and a tab connection portion (202) for connecting a tab of the battery; and where at least a partial structure of the package portion (3) is provided at the connection between the electrode lead-out portion (201) and the tab connection portion (202) and/or the connection between the electrode lead-out portion (201) and an electrode of the battery. The battery of the invention improves the connection stability of between the tab of the battery and the electrode of the battery.

The present application provides a top cover assembly, a single cell, and a battery pack. The top cover assembly includes a plastic member and a cover plate. The cover plate is provided with a pressure relief port. The plastic member is connected to a side of the cover plate adjacent to the electrode assembly. The plastic member includes a fracture region. The fracture region is provided adjacent to the pressure relief port. The fracture region is configured to be fractured after being subjected to an air pressure inside a cell.

The present application provides a positive electrode sheet, a battery cell, and an electrical device, which belong to the field of battery technologies. The electrical device includes the battery cell, the battery cell includes the positive electrode sheet, and the positive electrode sheet satisfies the formula: 2.5 ≤ H/PD ≤ 4.5, where H represents the Mohs hardness scale of the positive electrode sheet, and PD represents the compaction density of the positive electrode sheet.

The present application provides a housing assembly, a battery, and an energy storage device. The housing assembly includes a housing body and a cover. The housing body is provided with an accommodating cavity and includes two first end portions arranged oppositely. At least one first end portion is provided with a mounting hole communicated with the accommodating cavity. The cover includes a cover body and an insertion portion, and the insertion portion is inserted into the mounting hole. The inner side wall of the mounting hole includes a first side wall section that is tapered and connected to the first end portion and/or the side wall of the insertion portion includes a second side wall section that is tapered.

The application discloses a welding method of a battery shell, a battery shell, and a battery cell, belonging to the technical field of battery manufacturing. The battery shell includes a cover plate and a shell. The cover plate includes a body and an overlapping protrusion. The overlapping protrusion is melted and welded to a top of the body by providing a welding laser to run a loop on a top of the overlapping protrusion. The method of top welding can also better realize the welding of the overlapping protrusion and the shell, which not only retains the advantage of high welding speed of the top welding, but also has the advantage of side welding to avoid light leakage into the battery cell.

The present application provides a current collecting plate, a battery cell, and an electrical device. The current collecting plate includes a current collecting plate body and a foldable member, the current collecting plate body is defined with a through hole, the foldable member is provided at the through hole, the foldable member includes a current collecting portion and a connecting portion, and the connecting portion connects the current collecting portion with the current collecting plate body. A thickness of a part of the connecting portion is less than a thickness of other parts of the connecting portion, and/or a thickness of at least part of the connecting portion is less than a thickness of the current collecting plate body, and/or a thickness of at least part of the connecting portion is less than a thickness of the current collecting portion.

The present application provides a cover plate, a battery, and an electrical device. The cover plate includes a cover plate body, an explosion-proof structure, and a copper layer. The explosion-proof structure is disposed on the cover plate body, at least one side of the cover plate body is provided with the copper layer, the copper layer covers the explosion-proof structure, and the cover plate body and the copper layer are made of different materials.

A battery, a battery pack, a housing, and a housing assembly are provided. The battery includes a housing, a cover assembly and a first sealing element. A first opening is formed at one end of the housing, the cover assembly is connected to the housing and seals the first opening, the first sealing element is disposed between the cover assembly and the housing. The first sealing element wraps a side surface of the cover assembly and forms a sealed connection to the cover assembly and the housing, and a gap is formed between the first sealing element and the side surface of the cover assembly.

This application provides a battery cell, which relates to the technical field of battery cells. The battery cell includes an electrode assembly and a housing, wherein the electrode assembly is arranged in the housing, and an explosion-proof structure is provided on the housing; a valve opening area S of the explosion-proof structure, a valve opening pressure P of the explosion-proof structure, an electrolyte injection amount m of the battery cell, and a capacity C of the battery cell satisfy 2.4 ≤ S×P-C/(m×1000) ≤ 5.4. This application appropriately sets the valve opening area of the explosion-proof structure, valve opening pressure of the of the explosion-proof structure, electrolyte injection amount of the battery cell, and the capacity of the battery cell, so that when the battery cell fails and causes thermal runaway, the explosion-proof structure can work in time, and different parameters, for example the capacity of the battery cell, can be set according to actual conditions, so as to meet the explosion-proof requirements of large-capacity batteries.

The present application provides a conductive adhesive and a preparation method thereof, a negative electrode sheet and a battery, which belongs to a field of battery technology. The conductive adhesive has a structural formula represented by formula (1), where m: n= (1-4): 1.