Abstract: Disclosed are a cover assembly, a battery and a battery pack. The cover assembly includes a cover plate, an electrode plate, a first insulator and a second insulator. The electrode plate is disposed on the cover plate, and the electrode plate includes a first electrode portion and a second electrode portion electrically connected to each other. The first insulator is disposed between the electrode plate and the cover plate, and the second insulator is disposed on one side of the electrode plate away from the cover plate. The area of the first insulator corresponding to the first electrode portion is provided with a first through hole, the area of the second insulator corresponding to the second electrode portion is provided with a second through hole, and the orthographic projections of the first through hole and the second through hole on the cover plate do not overlap each other.

Abstract: A cover plate assembly and a secondary battery comprising the cover plate assembly. The cover plate assembly comprises a cover plate, a liquid injection hole and a sealing member, wherein the cover plate is provided with a first recess formed by recessing in the thickness direction of the cover plate, and a recess body; the liquid injection hole is arranged in the recess body; the sealing member is accommodated in the first recess and abuts against the end face of the recess body that faces the first recess; the end of a sealing body of the sealing member away from the recess body is provided with an outer edge abutting against a recess wall of the first recess; the outer edge forms a first measurement part; an edge of a port of a clearance recess forms a second measurement part.

Abstract: The invention provides a secondary battery and an application thereof. The secondary battery at least includes: a housing; and a wound cell, disposed in the housing and including a negative electrode plate, a positive electrode plate, and a separator. In a state of charge (SOC) of 100%, the wound cell satisfies: 0 ? L ? 1 ? ( 1 + X ? 1 ) ( L ? 2 ? ( 1 + X ? 2 ) ) ? 0 . 0 ? 2 ? 5 ? 5 ? % . L1 represents a thickness of the negative electrode plate under an initial SOC of 0%, X1 represents a longitudinal expansion rate of the negative electrode plate, L2 represents a width of the wound cell, and X2 represents a lateral expansion rate of the wound cell. Through the secondary battery and the application thereof according to the invention, lithium precipitation during the cycle process can be reduced, and the cycle performance of the secondary battery can be facilitated.

Abstract: Disclosed are a secondary battery, a battery assembly and an electronic device. The secondary battery includes: a housing, an end cap, an electrode assembly and a current collecting component. The housing includes an end wall and a side wall surrounding the end wall. An opening is formed on one side of the side wall facing away from the end wall. The side wall includes: a recessed portion recessed toward the interior of the housing, a body portion extending between the recessed portion and the end wall and a transition portion between the recessed portion and the body portion; the end cap is disposed on the opening side to seal the opening; the electrode assembly is disposed in the housing; the current collecting component includes a current collector and a housing connection portion, and the housing connection portion is disposed between the recessed portion and the electrode assembly.

Abstract: A cylindrical battery cell includes: a housing, an electrode assembly, a current collecting component, an end cap and a cover plate. The housing includes an end wall and a side wall surrounding the end wall. An opening is formed on one side of the side wall facing away from the end wall. A first tab is disposed on one side of the electrode assembly facing the opening. The current collecting component is welded with the first tab. The end cap is disposed on one side adjacent to the opening, and is welded with the side wall to seal the opening. In the thickness direction of the end cap, the end cap includes a recessed portion that is recessed toward the electrode assembly, and the recessed portion is welded with the current collecting component. The cover plate is disposed above the recessed portion to cover the recessed portion.

Abstract: A secondary battery pack includes a case, a terminal, an electrode assembly, a first current collector, and a cover assembly. The case includes an end wall and a sidewall surrounding the end wall. An opening is formed at an end of the sidewall. The terminal passes through and is insulated from the end wall. The electrode assembly is accommodated in the case and includes a first tab and a second tab electrically connected with the terminal. The first current collector is disposed at an end of the electrode assembly facing the opening and connected with the first tab by welding. The cover assembly includes first and second cover plates. The first cover plate covers the opening, is connected with the sidewall and the first current collector by welding, and includes a through hole. The second cover plate is welded to the first cover plate and seals the through hole.

Abstract: A cylindrical battery cell including a housing, an electrode assembly, a cap and a current collecting component is provided. The housing includes an end wall and a side wall surrounding the end wall. An opening is formed on one side of the side wall facing away from the end wall. The electrode assembly is disposed in the housing, and a first tab is provided on one side of the electrode assembly facing the opening. The cap is disposed on a side where the opening located, and is welded and connected to the side wall to seal the opening. The current collecting component is disposed on one side of the electrode assembly facing the opening, and the current collecting component is welded and connected to the first tab. The current collecting component includes a current collecting body and a thickened portion welded and connected to the cap.

Abstract: The disclosure provides a cover assembly, a battery, and an electronic apparatus. The electronic apparatus includes the battery, and the battery includes the cover assembly. The cover assembly includes a cover body and an electrode lead-out member. The cover body has a penetrating cover through hole. The electrode lead-out member has an outer conductive member and an inner conductive member. The inner conductive member passes through the cover through hole, is configured to be electrically connected to a tab led out from an electrode assembly, and is electrically connected to the outer conductive member. The outer conductive member includes a first metal layer and a second metal layer of different materials, and a connection layer is provided between the first metal layer and the second metal layer, so that the strength of connection between the first metal layer and the second metal layer is ensured.

Abstract: A cylindrical battery, a battery assembly, and an electrical apparatus are provided. The cylindrical battery includes a casing, a cell, and a current-collecting plate. One end wall of the casing is formed with a discharge zone to form a weakened end wall. The cell is disposed in the casing, and two end portions of the cell correspond to two end walls. An orthographic projection of the discharge zone towards the current-collecting plate overlaps at least a portion of the current-collecting plate. The current-collecting plate includes at least one extension portion extending from a circumferential outer edge of the weakened end wall to within a range of the orthographic projection, and within the range of the orthographic projection, the extension portion is configured to be adapted to be folded away from the corresponding end portion of the cell.

Abstract: A top cover, a battery including the same, and an electronic device is provided. The top cover includes a top cover plate, an electrode draw-out member and an external conductive member. The electrode draw-out member and the external conductive member are electrically connected, and the external conductive member is disposed on one side of the top cover plate away from an electrode assembly. The external conductive member includes a first metal layer and a second metal layer. A plug portion protruding toward the second metal layer is disposed on the first metal layer. A matching portion that matches with the plug potion is disposed on the second metal layer. The first metal layer and the second metal layer are matched and connected through the plug portion and the matching portion.

Abstract: Disclosed are a cover assembly and a single cell including the cover assembly. The cover assembly includes a cover body and an electrode draw-out member. The cover body has a penetrated cover through hole. The electrode draw-out member includes a through portion at least partially passes through the cover through hole and a connection plate located on one side of the covered body facing the electrode assembly; the connection plate includes a first connection portion, a transitional connection portion and a second connection portion connected in sequence, the first connection portion is connected to the through portion, and along a direction in which the electrode assembly is close to the cover body, one side of at least part of the second connection portion facing the electrode assembly is higher than one side of the first connection portion facing the electrode assembly to form an accommodation space for accommodating the tab.

Abstract: Disclosed are a cover assembly, a battery and a battery pack. The cover assembly includes a cover plate, an electrode plate, a first insulator and a second insulator. The electrode plate is disposed on the cover plate, and the electrode plate includes a first electrode portion and a second electrode portion electrically connected to each other. The first insulator is disposed between the electrode plate and the cover plate, and the second insulator is disposed on one side of the electrode plate away from the cover plate. The area of the first insulator corresponding to the first electrode portion is provided with a first through hole, the area of the second insulator corresponding to the second electrode portion is provided with a second through hole, and the orthographic projections of the first through hole and the second through hole on the cover plate do not overlap each other.

Abstract: Disclosed are a secondary battery and an electrical device including the secondary battery to solve the problem of welding between the electrode pillar and the current collecting portion of the existing secondary battery. The secondary battery includes: a housing, an electrode assembly, an electrode pillar and a current collecting portion. The electrode assembly is disposed in the housing in a sealed manner; the electrode pillar penetrates through the housing in a sealed and insulating manner, and is disposed with a thinned region with a thickness of T1; the current collecting portion is disposed in the housing and electrically connected with the electrode of the electrode assembly; a welding portion with a thickness of T2 is disposed on the current collecting portion and T2 is greater than 0.3T1; the thinned region is in conductive contact with the welding portion and is fixed through welding.

Abstract: Disclosed are a battery cell structure, a battery module and a battery pack. The battery cell structure includes a housing, an electrode assembly, a top cover assembly and a pin part. The electrode assembly is arranged in the housing. The electrode assembly includes a battery cell body and a tab extending from the battery cell body, the top cover assembly includes a top cover body and electrode terminals arranged thereon. The top cover body is connected to the housing, the pin part includes a terminal connection part and a tab guide part connected to each other, and the terminal connection part is connected to the electrode terminal. The tab guide part is connected to the tab, the terminal connection part is connected to the tab guide part, and one side of the tab guide part away from the electrode assembly is the outer surface.

Abstract: Disclosed are an insulation structure, a secondary battery and a battery pack, including a first insulation member having a bottom surface covering area and a side covering area, wherein the side covering area is located on the same side of the bottom surface covering area to form an accommodation space; the side covering area includes two opposite first side covering areas and two opposite second side covering areas; at least one of the two opposite first side covering areas includes a central overlapping area, a first side overlapping area and a second side overlapping area. The insulation structure and the secondary battery realize the insulation wrapping of the first side covering area on the three overlapping areas through folding and covering the three overlapping areas.

Abstract: The invention belongs to the technical field of secondary batteries, and discloses a current collecting member, a cell and an electronic device. The current collecting member includes a main body structure and a lead-out structure. The main body structure is further provided with protection member, at least one end of the protection member is bent along the width direction of the main body structure and wraps the corner portion of the main body structure in the thickness direction. The current collecting member of the invention protects one side of the main body structure of the current collecting member close to the electrode assembly and the corner portion of the main body structure through the protection member, thereby effectively protecting the tabs.

Abstract: The disclosure belongs to the technical field of secondary batteries, and discloses a current collecting member, a battery and a battery manufacturing method. The current collecting member includes a connecting structure, the connecting structure includes a through groove, the through groove extends along the length direction of the connecting structure, and the edge of the through groove is provided with a protrusion. The structural strength of the main body of the current collecting member of the present disclosure is high.