Abstract: A welding pressing plate includes a pressing plate main body configured to press a welding member, the pressing plate main body being provided with a first welding track and a second welding track, where the first welding track and the second welding track are spaced apart, the first welding track and the second welding track each penetrate through two opposite side surfaces of the pressing plate main body, the pressing plate main body is disposed to cover an end surface of the welding member, the first welding track is configured to expose a portion of an edge of the welding member, and the second welding track is configured to expose a remaining portion of the edge of the welding member.

Abstract: The present application provides a positive electrode active material and a preparation method thereof, a positive electrode sheet, a secondary battery, and an electric apparatus. The positive electrode active material includes a first positive electrode active material and a second positive electrode active material. The first positive electrode active material is a nickel-iron-manganese-copper quaternary sodium battery positive electrode active material; and a chemical formula of the second positive electrode active material is Naa2[Nib2Fec2Mnd2Me2]O2, where 0.8?a2<1, 0.01?b2<0.35, 0.01?c2<0.35, 0.01?d2<0.35, 0?e2<0.1, b2+c2+d2+e2=1, and the M element includes any one or more of Zn, Ti, Zr, Mg, La, Y, Co, Cr, Al, K, V, Mo, W, Sr, Ta, Nb, or Ca.

Abstract: A secondary battery includes a negative electrode plate including a negative electrode current collector and a negative electrode film layer having a first surface distal to the negative electrode current collector and a second surface opposite to the first surface. A first region extending from the second surface to a thickness range of 0.3 H(H being a thickness of the negative electrode film layer) includes a first negative electrode active material including a first carbon-based material. A second region extending from the first surface to the thickness range of 0.3 H includes a second negative electrode active material including a second carbon-based material. The first carbon-based material includes natural graphite. A total pore area of an internal region of the second carbon-based material is greater than a total pore area of an external region of the second carbon-based material.

Abstract: A secondary battery includes a negative electrode plate, the negative electrode plate includes a negative electrode current collector and a negative electrode film layer on at least one surface of the negative electrode current collector, the negative electrode film layer includes a negative electrode active material, and the negative electrode active material includes a first carbon-based material and a second carbon-based material. The first carbon-based material has a pore structure, and the total pore area S2 of an internal region of the first carbon-based material is larger than the total pore area S1 of an external region of the first carbon-based material; and the second carbon-based material satisfies ID/IG?0.140.

Abstract: A battery insertion device comprises a machine frame, a bearing mechanism arranged on the machine frame and used for bearing a bottom cover and an electrode assembly supported above the bottom cover, and an insertion mechanism arranged on the machine frame and comprising a case fixing mechanism and a tab part guide mechanism. The case fixing mechanism is used for fixing a case. The tab part guide mechanism and the case fixing mechanism both can get close to or away from the bearing mechanism. The case fixing mechanism is configured to sleeve the case onto the outer side of the electrode assembly by means of an open end when moving close to the bearing mechanism. The tab part guide mechanism is configured to guide a tab part to penetrate out of an accommodating cavity through a through hole when the case is sleeved on the electrode assembly.

Abstract: A battery production line includes at least one independent safety region, the safety control system at least includes a safety control unit, a production device, and a safety relay corresponding to the production device in the safety region, and the production device at least includes a robot, where the safety control unit is configured to generate a safety control signal in response to a safety trigger event; the safety relay is connected to the safety control unit and configured to send a shutdown control signal to a controller of the robot in response to the safety control signal; and the controller of the robot is connected to the safety relay and configured to control, in response to the shutdown control signal, the robot to be in a safe state.

Abstract: A battery cell includes a case, and an end cover which is arranged at one end of the case; a joint of the case and the end cover is provided with a first connecting seam and a second connecting seam which are arranged along a circumferential direction of the case; the end cover welding apparatus includes a material conveying assembly and a welding assembly, in which, the material conveying assembly includes a conveying line. The first clamp and the second clamp are arranged at an interval on the same conveying line. The welding assembly is arranged along the conveying line and is configured to weld the first connecting seam when the first clamp with the battery cell fixed is conveyed to the welding assembly, and is also configured to weld the second connecting seam when the second clamp with the battery cell fixed is conveyed to the welding assembly.

Abstract: The adhesive tape attaching apparatus includes a positioning mechanism and a sheet material attaching mechanism. The positioning mechanism is configured to position a sheet material. The sheet material has an exposed first adhesive surface. The sheet material attaching mechanism is configured to pick up the sheet material positioned by the positioning mechanism and attach the sheet material to a target position of a component to be attached. The positioning mechanism includes a base, a support platform, and a pushing assembly. The support platform is disposed on the base and configured to support the sheet material. The first adhesive surface of the sheet material comes into contact with a support surface of the support platform. The support platform is provided with an anti-adhesive structure. The support surface of the support platform includes at least the support surface of the anti-adhesive structure.

Abstract: A blocking mechanism includes a blocking assembly and a trigger member. The blocking assembly includes a transmission member, a blocking member, and an elastic member. The blocking member includes a first position for blocking and a second position for unblocking. The transmission member is connected to the blocking member, and the elastic member can place the blocking member in the first position; and the trigger member can contact the transmission member along two opposite directions of the transmission member to place the blocking member in the second position.

Abstract: A secondary battery includes a negative electrode plate including a negative electrode current collector and a negative electrode film layer located on at least one surface of the negative electrode current collector and including a negative electrode active material that includes a first carbon-based material and a second carbon-based material. The first carbon-based material includes an external region and an internal region located at an inner side of the external region. The external region extends from a surface of a particle of the first carbon-based material to an interior of the particle by a distance of 2.5 ?m. In a cross-sectional view of the first carbon-based material, a total pore area of the external region is smaller than a total pore area of the internal region. A degree of graphitization of the first carbon-based material is greater than a degree of graphitization of the second carbon-based material.

Abstract: A secondary battery includes a negative electrode plate; the negative electrode plate includes a negative electrode current collector and a negative electrode film layer located on at least one surface of the negative electrode current collector and including a negative electrode active material; the negative electrode active material includes a first carbon-based material and a second carbon-based material; the first carbon-based material includes artificial graphite in the form of secondary particles; the second carbon-based material includes an external region and an internal region located on the inner side of the external region; and the external region refers to a region formed by extending from the surface of a particle of the second carbon-based material to the interior of the particle by a distance of 2.5 ?m.

Abstract: A secondary battery includes a negative electrode plate, and the negative electrode plate includes a negative electrode current collector and a negative electrode film layer located on at least one surface of the negative electrode current collector and including a negative electrode active material, where the negative electrode active material includes a first carbon-based material and a second carbon-based material, the first carbon-based material has a pore structure, ID/IG of the first carbon-based material is less than or equal to 0.280, ID denotes the D peak intensity at 1350±50 cm?1 in the Raman spectrum, and IG denotes the G peak intensity at 1580±50 cm?1 in the Raman spectrum; and the second carbon-based material is an amorphous carbon material.

Abstract: A secondary battery includes negative electrode plate including negative electrode film layer having first surface and second surface opposite to each other. First region of the negative electrode film layer extending from the second surface to thickness range of 0.3H includes first active material including first carbon-based material. Second region of the negative electrode film layer extending from the first surface to thickness range of 0.3H includes second active material including second carbon-based material that includes amorphous carbon material. The first carbon-based material includes external region and internal region inside the external region. The external region extends from surface of particle of the first carbon-based material to interior of the particle by distance of 2.5 ?m. In cross-sectional view of the first carbon-based material, total pore area of the external region is smaller than total pore area of the internal region.

Abstract: A secondary battery and an electric device are provided. The secondary battery includes a negative electrode sheet and a positive electrode sheet. The negative electrode sheet includes a negative electrode film layer comprising artificial graphite having a graphitization degree greater than 93%. The positive electrode sheet includes a positive electrode film layer comprising a positive electrode active material in the form of single-crystal particles, wherein a total molar amount of nickel, cobalt, and manganese in a chemical formula of the positive electrode active material is 1, and a molar amount of nickel is 0.6 to 1. An areal density of the negative electrode film layer is ?1, an areal density of the positive electrode film layer is ?2, and a ratio ?1/?2 is 0.35 to 0.75. The secondary battery exhibits reduced swelling force, improved cycling performance, and high energy density.

Abstract: A secondary battery includes a negative electrode plate. The negative electrode plate includes a negative electrode current collector and a negative electrode film layer located on at least one surface of the negative electrode current collector, wherein the negative electrode film layer is provided with a first surface away from the negative electrode current collector and a second surface opposite to the first surface, and the thickness of the negative electrode film layer is denoted as H; a region within a thickness range from the first surface of the negative electrode film layer to 0.3H is denoted as a first region, the first region includes a first negative electrode active material, and the first negative electrode active material includes a first carbon-based material; and the first carbon-based material satisfies that a total pore area of an external region is less than a total pore area of an internal region.

Abstract: A pressing plate assembly comprises a pressing plate and a rotating pressure arm, wherein the pressing plate is configured to cover an end surface of a to-be-welded member; and the rotating pressure arm is connected to the pressing plate, is configured to press the to-be-welded member through the pressing plate, extends in a direction away from the pressing plate, and is capable of rotating relative to the to-be-welded member, to change a position of an edge of the to-be-welded member shielded by the rotating pressure arm and/or the pressing plate. Therefore, the pressing plate covers the end surface of the to-be-welded member, the rotating pressure arm is connected to the pressing plate, and the to-be-welded member may be pressed through the rotating pressure arm and the pressing plate, so that the to-be-welded member tightly contacts with other components.

Abstract: Provided are secondary battery and an electric device. The secondary battery includes a negative electrode plate. The negative electrode plate includes a negative electrode current collector and a negative electrode film layer on at least one surface of the negative electrode current collector. The negative electrode film layer includes a negative electrode active material. The negative electrode active material includes a first carbon-based material and a second carbon-based material, and both the first carbon-based material and the second carbon-based material are provided with pore structures. The ID/IG of the first carbon-based material is ?0.27, and the ID/IG of the second carbon-based material is ?0.38, where the ID denotes the D peak intensity at 1350±50 cm?1 in a Raman spectrum, and the IG denotes the G peak intensity at 1580±50 cm?1 in a Raman spectrum.

Abstract: A welding pressing plate includes a pressing plate main body and a movable pressing arm, where the pressing plate main body is configured to cover an end surface of a weldment; the movable pressing arm is connected to the pressing plate main body, and the movable pressing arm is configured to press the weldment through the pressing plate main body, and the movable pressing arm extends in a direction away from the pressing plate main body, and can drive the pressing plate main body to move relative to the weldment to change a position of an edge of the weldment shielded by the movable pressing arm and/or the pressing plate main body.

Abstract: A battery cell, a battery, and an electric apparatus are disclosed. The battery cell includes a housing, an electrode assembly, and an electrode terminal . The housing includes a first wall. The electrode assembly is accommodated within the housing. The electrode terminal includes a terminal body and a reinforcing member. The terminal body is disposed on the first wall and electrically connected to the electrode assembly. The reinforcing member is connected to an end of the terminal body in a thickness direction of the terminal body. Based on the above structure, the electrode terminal can achieve higher structural strength, thereby reducing the risk of cracking of the electrode terminal due to stress concentration or inadequate structural strength, and extending the service life of the electrode terminal and the battery cell.

Abstract: Disclosed in the present application are a separator, a battery and an electric device. The separator comprises a porous substrate and a coating arranged on at least one surface of the porous substrate, wherein the coating comprises a fiber material and a granular filler, the fiber material comprises a first fiber material and a second fiber material, the average length of the first fiber material is denoted as L1, the average length of the second fiber material is denoted as L2, L1 is greater than 800 nm, and L1/L2 is greater than or equal to 2.4. The present application enables the battery to have a high reliability and good cycle performance.