Abstract: The disclosure relates to the technical field of batteries and provides a cylindrical battery including a winding cell. The winding cell includes a winding cell body and a first tab extending from one side of the winding cell body. The winding cell body is wound to form a central hole. In a radial direction of the central hole, the first tab includes a plurality of single tabs, and the plurality of single tabs form a first region. Herein, heights of the plurality of single tabs in the first region gradually increase. A difference value between a maximum height difference value and a minimum height difference value between adjacent single tabs in the radial direction of the central hole is less than or equal to 0.5 mm. The height of each of the single tabs is a dimension of the single tab in a lead-out direction thereof.

Abstract: The disclosure relates to the technical field of batteries and provides a cylindrical battery including a winding cell. One end of the winding cell is provided with a first tab and a center of the winding cell is formed with a central hole. The first tab includes a first tab layer and a second tab layer disposed adjacent to each other, the first tab layer includes a first single tab, the second tab layer includes at least two second single tabs, a number of the second single tabs of the second tab layer is one more than a number of the first single tab of the first tab layer.

Abstract: The disclosure relates to the technical field of batteries, and a cylindrical battery is provided, including a wound core, and the wound core includes: a wound core body; a first tab portion, which extends from one side of the wound core body, the wound core body is formed with a wound core hole, the first tab portion includes a first tab set and a second tab set adjacent to each other, the first tab set includes at least two first tabs, and the second tab set includes a second tab; a first gap is formed between adjacent first tabs, and the orthographic projections of the second tab and the first gap on the same plane at least partially overlap each other along the radial direction of the wound core hole.

Abstract: The disclosure relates to the technical field of batteries, and a cylindrical battery is provided, including: a single cell housing structure; a core, which is arranged in the single cell housing structure, and the core includes a core body, a first tab and a second tab, and the first tab and the second tab arranged at intervals extend out from the same end of the core body, and the core body is formed with a winding center; the first tab and the second tab are arranged along the circumferential direction of the winding center, and the length of the first tab is greater than the length of the second tab along the radial direction of the winding center. A certain distance may be set between the first tab and the second tab on basis that the first tab and the second tab are able to have sufficient current-passing capability.

Abstract: The disclosure relates to the technical field of batteries, and a battery is provided, including a housing; a cell, which is disposed in the housing, and includes a main body and a first tab, and the first tab is led out from one end of the main body; a first insulator, which is disposed in the housing; a first current collector, which is integrally formed in the first insulator, and is connected to the first tab; the largest circumferential outer edge of the orthographic projection of the first current collector facing an end surface of the main body is located inside the largest circumferential outer edge of the orthographic projection of the first insulator facing an end surface of the main body.

Abstract: A cylindrical battery includes a battery housing; a cell, which is arranged in the battery housing, and includes a cell body and a tab portion, and the tab portion is extended from at least one side of the cell body; a first insulating film, which is arranged on the outer surface of the cell body, and is connected with the cell; a second insulating film, which is arranged on the outer surface of the cell body, the second insulating film covers and is connected with the first insulating film. One end of the second insulating film is not lower than an end surface of the cell body provided with the tab portion, and the other end of the second insulating film overlaps the first insulating film so that a portion of the second insulating film overlaps the first insulating film.

Abstract: The present invention discloses techniques of displaying a video. The disclosed techniques comprises receiving comment text information from a user, the comment text information is associated with the video; determining that the comment text information corresponds to a predetermined type of bullet screen based on parsing the comment text information; displaying a target bullet screen being generated based on the comment text information; displaying at least one interface element each of which is selectable and corresponds to an operation associated with the target bullet screen in response to detecting a selection of the target bullet screen on a first interface for playback of the video; and controlling the video to jump to a target interface for playback of the video in response to detecting a selection of one of the at least one interface element.

Abstract: A deep low-permeability gassy seam drilling-slitting-sealing-fracturing drilling device includes a drilling control system, a high-pressure water power system, a water pressure grading control system and a fracturing and sealing control system. The drilling control system adjusts a drilling direction a water supply pressure of the drill rod, the high-pressure water power system supplies high-pressure water with different pressures to the device, and the water pressure grading control system ensures that a water pressure for flushing drill cuttings is less than 5 MPa, a water pressure for slitting in a direction perpendicular to a length of the drill rod is 25-35 MPa, a water pressure for sealing with a borehole sealing capsule is 35-40 MPa, and a water pressure for further pressure relief and permeability increasing of a coal seam is 40-50 MPa. The fracturing and sealing control system controls borehole sealing and hydrofracturing operations.

Abstract: A deep low-permeability high gassy seam drilling-slitting-sealing-fracturing drilling device includes a drilling control system, a high-pressure water power system, a water pressure grading control system and a fracturing and sealing control system. The drilling control system adjusts a drilling direction a water supply pressure of the drill rod, the high-pressure water power system supplies high-pressure water with different pressures to the device, and the water pressure grading control system ensures that a water pressure for flushing drill cuttings is less than 5 MPa, a water pressure for slitting in a direction perpendicular to a length of the drill rod is 25-35 MPa, a water pressure for sealing with a borehole sealing capsule is 35-40 MPa, and a water pressure for further pressure relief and permeability increasing of a coal seam is 40-50 MPa. The fracturing and sealing control system controls borehole sealing and hydrofracturing operations.

Abstract: A steeply-inclined ultra-thick coal seam gas control method based on a binary composite liquid. The method includes taking a clean fracturing fluid system and a microemulsion as a binary composite liquid. The method includes injecting the binary composite liquid into a coal mass by means of a main hydraulic fracturing and permeability improvement method of hydraulic fracturing and water jet slotting to form a coal mass gas extraction system of binary composite liquid fracturing and permeability improvement. The method includes investigating and analyzing a gas control effect of the steeply-inclined ultra-thick coal seam according to change characteristics and analysis of gas extraction flow rate, change characteristics and analysis of permeability coefficient of coal seam, change characteristics and analysis of gas natural desorption speed of coal mass, change characteristics and analysis of gas concentration of return air flow of working face and theoretical analysis of drilling cuttings index.

Abstract: A steeply-inclined ultra-thick coal seam gas control method based on a binary composite liquid. The method includes taking a clean fracturing fluid system and a microemulsion as a binary composite liquid. The method includes injecting the binary composite liquid into a coal mass by means of a main hydraulic fracturing and permeability improvement method of hydraulic fracturing and water jet slotting to form a coal mass gas extraction system of binary composite liquid fracturing and permeability improvement. The method includes investigating and analyzing a gas control effect of the steeply-inclined ultra-thick coal seam according to change characteristics and analysis of gas extraction flow rate, change characteristics and analysis of permeability coefficient of coal seam, change characteristics and analysis of gas natural desorption speed of coal mass, change characteristics and analysis of gas concentration of return air flow of working face and theoretical analysis of drilling cuttings index.

Abstract: Provided are a drill-power-based directional hydraulic fracturing system for downhole quick slotting and a method thereof. The directional hydraulic fracturing system includes a water injection pump, a high pressure rubber pipe arranged on the water injection pump is in communication with a drill, a dedicated sealing drill rod for hydraulic fracturing is arranged on the drill, a front segment of the drill rod may be connected with a directional borehole sealer through threads and a sealing ring is provided at the threaded connection. The main steps include drilling, slotting, borehole sealing and fracturing. Firstly, a drill-cut integrated tool is installed at a front end of the drill rod. After drilling is completed, hydraulic slotting, permeability improvement and pressure relief are performed without changing a drill bit. After slotting is completed, the drill bit is retreated, and the directional borehole sealer is installed and pushed to a predetermined position for efficiency sealing.

Abstract: Provided are a drill-power-based directional hydraulic fracturing system for downhole quick slotting and a method thereof. The directional hydraulic fracturing system includes a water injection pump, a high pressure rubber pipe arranged on the water injection pump is in communication with a drill, a dedicated sealing drill rod for hydraulic fracturing is arranged on the drill, a front segment of the drill rod may be connected with a directional borehole sealer through threads and a sealing ring is provided at the threaded connection. The main steps include drilling, slotting, borehole sealing and fracturing. Firstly, a drill-cut integrated tool is installed at a front end of the drill rod. After drilling is completed, hydraulic slotting, permeability improvement and pressure relief are performed without changing a drill bit. After slotting is completed, the drill bit is retreated, and the directional borehole sealer is installed and pushed to a predetermined position for efficiency sealing.