Abstract: Provided are a current collector assembly, a battery cell, and a battery pack. The current collector assembly includes a plurality of layers of tabs, a protection plate, a connection plate, and at least one protrusion. The plurality of layers of tabs is stacked in a thickness direction of each of the tabs. The protection plate is arranged at a side of the plurality of layers of tabs in the thickness direction of each of the tabs. The connection plate is arranged at another side of the plurality of layers of tabs in the thickness direction of each of the tabs. The at least one protrusion is arrange between the connection plate and the protection plate. Each of the at least one protrusion penetrates the plurality of layer of tabs, and is connected to the plurality of layers of tab.

Abstract: Provided are a connector, a battery cell, and a battery pack. The connector is configured to electrically connect a plurality of layers of tabs of an electrode plate. The connector includes a connection plate and a protrusion arranged at the connection plate. The protrusion protrudes from a side surface of the connection plate in a thickness direction of the connection plate, and is configured to penetrate the plurality of layers of tabs.

Abstract: An electrode assembly is provided in the disclosure. The electrode assembly includes a positive electrode and a negative electrode. The positive electrode includes a first insulating layer, a first conductive layer on one surface of the first insulating layer and a second conductive layer on the other surface of the first insulating layer, a first active material layer on a surface of the first conductive layer, and a second active material layer on a surface of the second conductive layer. The negative electrode includes a second insulating layer, a third conductive layer on one surface of the second insulating layer and a fourth conductive layer on the other surface of the second insulating layer, a third active material layer on a surface of the third conductive layer, and a fourth active material layer on a surface of the fourth conductive layer.

Abstract: An electrode sheet and an electrode sheet assembly are provided. The electrode sheet includes a current collector, a first active material layer, and a second active material layer. The current collector has a first surface and a second surface opposite to the first surface. The first active material layer covers at least a part of the first surface. The second active material layer covers at least a part of the second surface. The first active material layer is different from the second active material layer. The first active material layer and the second active material layer have different particle size distributions.

Abstract: Provided are a preparation method of a current collector assembly, a current collector assembly, a battery cell, and a battery pack. The preparation method of the current collector assembly includes: abutting the at least one of the connection plate or the protection plate having the protrusion against the plurality of tabs; generating a high-frequency vibration between the at least one of the connection plate or the protection plate having the protrusion and the plurality of tabs; and piercing the plurality of tabs sequentially by the protrusion through the high-frequency vibration. A vibration frequency of the high-frequency vibration ranges from 15 KHz to 40 KHz.

Abstract: The present disclosure relates to a welding device and a processing apparatus for a secondary battery current collector. The welding device includes: a welding head; and an anvil block. A welding station is disposed between the welding head and the anvil block. The welding device is configured to weld a foil to a portion of a composite current collector at the welding station. According to this solution, the foil can be used as a tab of the composite current collector by using the foil to connect with the composite current collector so as to output the current in the battery cell.

Abstract: The present application discloses a current collector, an electrode plate, and an electrochemical device. The current collector comprises: a support layer comprising opposite two surfaces along the thickness direction thereof; a conductive layer disposed on at least one of the two surfaces of the support layer; wherein the support layer comprises a support material selected from one or more of a polymer material and a polymer matrix composite material, and wherein the light transmittance T of the support layer is 0?T?98%. The current collector, electrode plate and electrochemical device provided by the present application have good processability.

Abstract: The present application discloses a current collector, an electrode plate, and an electrochemical device. The current collector comprises: a support layer comprising opposite two surfaces along the thickness direction thereof; a conductive layer disposed on at least one of the two surfaces of the support layer; wherein the support layer comprises a support material selected from one or more of a polymer material and a polymer matrix composite material, and wherein the light transmittance T of the support layer is 0?T?98%. The current collector, electrode plate and electrochemical device provided by the present application have good processability.

Abstract: The present disclosure relates to a welding device and a processing apparatus for a secondary battery current collector. The welding device includes: a welding head; and an anvil block. A welding station is disposed between the welding head and the anvil block. The welding device is configured to weld a foil to a portion of a composite current collector at the welding station. According to this solution, the foil can be used as a tab of the composite current collector by using the foil to connect with the composite current collector so as to output the current in the battery cell.

Abstract: The present disclosure relates to a processing apparatus for a secondary battery current collector. The processing apparatus includes: a foil uncoiling roller; a composite current collector uncoiling roller; a welding device; a plurality of driving rollers; and a coiling roller. Both the foil uncoiling roller and the composite current collector uncoiling roller are disposed on a feeding side of the welding device. The welding device is configured to weld foil to a portion of a composite current collector. The plurality of driving rollers is respectively disposed on a feeding side and a discharging side of the welding device, and has an equal line speed. The plurality of driving rollers is configured to drive the overlapped foil and the composite current collector to downstream. The coiling roller is configured to wind up the composite current collector having the foil welded thereon.