The present application discloses a binder, a negative-electrode slurry, a negative electrode, and a lithium-ion battery. In the present application, the binder comprises a first block polymer and a second block polymer. The first block polymer is a lithiated tetrablock polymer having a structure shown as B-C-B-A, wherein A represents a polymer block A, B represents a polymer block B, and C represents a polymer block C; the polymer block A is polymerized from alkenyl formic acid monomers; the polymer block B is polymerized from aromatic vinyl monomers; and the polymer block C is polymerized from acrylate monomers. The second block polymer is a lithiated triblock polymer having a structure shown as E-F-E, wherein E represents a polymer block E, and F represents a polymer block F; the polymer block E is polymerized from alkenyl formic acid monomers; and the polymer block F is polymerized from acrylate monomers.

An electrode plate includes: a current collector, including, in a width direction, a first edge region, a second edge region, and a middle region located between the first edge region and the second edge region; a first coating layer, including a first portion and a second portion disposed on the first edge region and the second edge region respectively; and a second coating layer. A part of the second coating layer is disposed on the middle region, another part of the second coating layer is disposed on the first coating layer. The second coating layer includes an active material. A first bonding force between the first portion and the first edge region and a second bonding force between the second portion and the second edge region are both greater than a third bonding force between the second coating layer and the middle region.

An electrode plate includes: a current collector, including, in a width direction, a first edge region, a second edge region, and a middle region located between the first edge region and the second edge region; a first coating layer, including a first portion and a second portion disposed on the first edge region and the second edge region respectively; and a second coating layer. A part of the second coating layer is disposed on the middle region, another part of the second coating layer is disposed on the first coating layer. The second coating layer includes an active material. A first bonding force between the first portion and the first edge region and a second bonding force between the second portion and the second edge region are both greater than a third bonding force between the second coating layer and the middle region.

A flat-plate type sodium metal battery and an electrochemical device are described. The battery comprises a positive electrode plate and a negative electrode plate, the positive electrode plate provided with a first micro-through-hole arranged in an array on at least part of the surface thereof, the negative electrode plate provided with a second micro-through-hole arranged in an array on at least part of the surface thereof, wherein the first micro-through-hole and the second micro-through-hole have an overlapping area of ≥5% of the total area of the second micro-through-hole of the negative electrode plate. Disposing a first micro-through-hole on the positive electrode plate, and a second micro-through-hole on the negative electrode plate, and setting the aperture size and aperture spacing of micro-through-holes are beneficial to increasing infiltration and penetration of the electrolyte in the positive electrode plate and are conducive to rapid infiltration to large-sized electrode plates.

A flat-plate type sodium metal battery and an electrochemical device are described. The battery comprises a positive electrode plate and a negative electrode plate, the positive electrode plate provided with a first micro-through-hole arranged in an array on at least part of the surface thereof, the negative electrode plate provided with a second micro-through-hole arranged in an array on at least part of the surface thereof, wherein the first micro-through-hole and the second micro-through-hole have an overlapping area of ≥5% of the total area of the second micro-through-hole of the negative electrode plate. Disposing a first micro-through-hole on the positive electrode plate, and a second micro-through-hole on the negative electrode plate, and setting the aperture size and aperture spacing of micro-through-holes are beneficial to increasing infiltration and penetration of the electrolyte in the positive electrode plate and are conducive to rapid infiltration to large-sized electrode plates.

The present application discloses a battery module, a battery pack, an apparatus, and a method and device for manufacturing a battery module. The battery module includes n first-type battery cells and m second-type battery cells, n≥1, m≥1, and the n first-type battery cells and them second-type battery cells are arranged and satisfy: VED.sub.1>VED.sub.2, ΔF.sub.1>ΔF.sub.2, and (ΔF.sub.1×n+ΔF.sub.2×m)/(n+m)≤0.8×ΔF.sub.1, where VED.sub.1, VED.sub.2, ΔF.sub.1 and ΔF.sub.2 are respectively defined in the description.

The present application discloses a battery module, a battery pack, an apparatus, and a method and device for manufacturing a battery module. The battery module includes n first-type battery cells and m second-type battery cells, n≥1, m≥1, and the n first-type battery cells and them second-type battery cells are arranged and satisfy: VED.sub.1>VED.sub.2, ΔF.sub.1>ΔF.sub.2, and (ΔF.sub.1×n+ΔF.sub.2×m)/(n+m)≤0.8×ΔF.sub.1, where VED.sub.1, VED.sub.2, ΔF.sub.1 and ΔF.sub.2 are respectively defined in the description.

In an anode for a secondary battery, a method for preparing the anode, a secondary battery including the anode, and an apparatus for applying a magnetic field, the anode for a secondary battery includes an anode mixture layer on at least one surface of an anode current collector, in which a z-tensor value of a pore in the anode mixture layer is 0.25 or more. The method includes applying an anode mixture slurry including an anode active material to at least one surface of an anode current collector; and drying the anode mixture slurry to form an anode mixture layer. During at least one of the applying and the drying, a magnetic field in which a direction of a line of magnetic force and magnetic force strength change is applied from both upper and lower surfaces of the anode current collector to orient the anode active material and the pore.

In an anode for a secondary battery, a method for preparing the anode, a secondary battery including the anode, and an apparatus for applying a magnetic field, the anode for a secondary battery includes an anode mixture layer on at least one surface of an anode current collector, in which a z-tensor value of a pore in the anode mixture layer is 0.25 or more. The method includes applying an anode mixture slurry including an anode active material to at least one surface of an anode current collector; and drying the anode mixture slurry to form an anode mixture layer. During at least one of the applying and the drying, a magnetic field in which a direction of a line of magnetic force and magnetic force strength change is applied from both upper and lower surfaces of the anode current collector to orient the anode active material and the pore.

An aluminum battery negative electrode structure includes an aluminum foil and a coating layer. The coating layer is arranged on the aluminum foil. A material of the coating layer includes a high specific surface area carbon material. A specific surface area of the high specific surface area carbon material ranges from 500 m.sup.2/g to 3,000 m.sup.2/g.