Abstract: A box body includes a carrying plate configured to carry a battery and a one-way gravity valve disposed at the carrying plate. The one-way gravity valve is configured to be closed in response to a gravity of liquid in the box body being less than a threshold, and to be open in response to the gravity of the liquid in the box body reaching the threshold.

Abstract: An electrochemical device includes a positive electrode, a negative electrode, and a separator. The negative electrode includes a negative electrode current collector and a negative electrode active material layer located on the negative electrode current collector. A cross-section porosity at a depth of less than 10 ?m from a surface of the negative electrode active material layer in a direction toward and perpendicular to the negative electrode current collector is X10, satisfying 5%?X10?25%, where the surface faces away from the negative electrode current collector. In some embodiments of this application, the effect of the electrolytic solution infiltrating the negative electrode active material layer is improved, and an ion transmission channel is provided, thereby helping to reduce impedance and suppress lithium plating.

Abstract: The present application provides a fire-fighting apparatus, a box assembly, a battery, a power consumption apparatus, and a method for preparing a battery. The fire-fighting apparatus includes: a pipe, a gas release mechanism, and a blocking structure. The pipe has an air inlet end and an air outlet end, and the air inlet end is configured to be connected to the battery, so that a combustible gas generated in the battery during thermal runaway events is capable of entering the pipe from the box via the air inlet end and being discharged from the pipe via the air outlet end; and the gas release mechanism is configured to be connected to the pipe and release a fire-fighting gas into the pipe when thermal runaway occurs in the battery; and the blocking structure is configured to block the combustible gas and the fire-fighting gas and change a flow direction.

Abstract: An electrochemical apparatus includes a positive electrode, the positive electrode includes a current collector and a positive electrode mixture layer disposed on at least one surface of the current collector. The positive electrode mixture layer includes a positive electrode active substance and a binder. The binder includes a fluorine-containing polymer. In an XRD diffraction pattern of the fluorine-containing polymer, a diffraction peak A appears at 25° to 27° and corresponds to a (111) crystal plane, and a diffraction peak B appears at 37° to 39° and corresponds to a (022) crystal plane, where an area ratio of the diffraction peak A to the diffraction peak B satisfies 1?A(111)/B(022)?4.

Abstract: A battery cell includes an electrode sheet. The electrode sheet includes an electrode sheet body and a plurality of tabs connected to the electrode sheet body. The width of each of the plurality of tabs is different from one another; or the length of each of the plurality of tabs is different from one another. The electrode sheet and the battery cell having the electrode sheet ensures that each of the tabs in the electrode sheet can electrically conduct well with the tab lead. Thus, the battery cell has the advantage of good electrical conductivity.

Abstract: An electrode assembly includes an electrode plate and a tab disposed on the electrode plate, where the tab includes a metal strip and a tab adhesive provided on the metal strip, and along a thickness direction of the tab, the tab adhesive includes a first adhesive layer provided on the metal strip and a second adhesive layer provided on the first adhesive layer, where a projection area of the first adhesive layer along the thickness direction of the tab is greater than a projection area of the second adhesive layer along the thickness direction of the tab.

Abstract: A positive electrode plate includes a positive electrode current collector and two positive electrode active material layers on both surfaces of the positive electrode current collector. The positive electrode active material layer includes a positive electrode active material and graphene. And 7.74?Dv501/2+0.05 THK?10.2, Dv50 is a particle size of the positive electrode active material and THK is a thickness of the positive electrode plate. And 0.078?w*CW+0.01n?1.9, n is a quantity of layers of the graphene, w is a mass percentage of the graphene in the positive electrode active layer, and CW is a one-side coating weight of the positive electrode active material layer.

Abstract: An electrolyte includes a fluorinated cyclic carbonate, a multi-nitrilemulti-nitrile compound having an ether bond and a compound having a sulfur-oxygen double bond. Based on a total weight of the electrolyte, a weight percentage (Cf) of the fluorinated cyclic carbonate is greater than a weight percentage (Cn) of the multi-nitrilemulti-nitrile compound having an ether bond. The electrolyte can control the expansion of the electrochemical device, so that the electrochemical device has excellent cycle, storage and/or floating-charge performance.

Abstract: Embodiments of the present application provide a battery, a power consumption device, and a method and device for producing a battery. The battery includes: a battery cell, the battery cell including a pressure relief mechanism configured to be actuated when an internal pressure or temperature of the battery cell reaches a threshold, to relieve the internal pressure; a fire-fighting pipeline configured to accommodate a fire-fighting medium and discharge the fire-fighting medium toward the battery cell when the pressure relief mechanism is actuated; and an accommodating part configured to accommodate the fire-fighting medium discharged from the fire-fighting pipeline to lower a temperature of the battery cell. According to technical solutions of the embodiments of the present application, the safety of the battery could be enhanced.

Abstract: A binder includes a polymer, the polymer is polymerized from a first monomer, a second monomer, a third monomer, and a fourth monomer. The first monomer, the second monomer, and the third monomer each are independently selected from an aromatic alkenyl compound, an olefinic unsaturated carboxylic acid, an olefinic unsaturated carboxylic acid salt, or an olefinic unsaturated carboxylic acid ester. The fourth monomer is selected from a substituted or unsubstituted compound containing an amine group and at least two alkenyl groups. By adding the fourth monomer into the binder, this application improves the electrolyte-resistant performance of the binder, improves the lithium-ion conduction performance of the binder, and in turn, improves the low-temperature discharge performance of the battery.

Abstract: A negative electrode material includes a carbonaceous active material. Observed in a 80 ?m×100 ?m region of an SEM image, the carbonaceous active material includes carbonaceous particles with pores. A proportion of a quantity of the carbonaceous particles with a quantity of the pores of N?2 in a total quantity of the carbonaceous particles in the 80 ?m×100 ?m region is ?60%, and a proportion of a quantity of the carbonaceous particles with a quantity of the pores of 3?N?5 in the total quantity of carbonaceous particles in the 80 ?m×100 ?m region is ?30%.

Abstract: An electrochemical device includes a negative electrode, the negative electrode includes a current collector and an active material layer located on at least one surface of the current collector, the active material layer including an inorganic thickener. The inorganic thickener is used in this application to achieve the effect of improving adhesive force and cohesive force of the negative electrode, which can reduce the amount of a thickener and improve the dynamic performance.

Abstract: A battery includes a conductive housing, an insulation layer, a pole, and a cell unit. The insulation layer is disposed in the housing, the pole penetrates through the insulation layer and is insulated from the housing. The electrode plates include a first and a second electrode plates. The first electrode plate includes a first current collector with a first active layer being disposed on one side of it facing the separator, an uncoated region on the other side is to form a first electrode output, which is electrically connected to the pole or the housing. The second electrode plate includes a second current collector, where a second active layer is disposed on at least one side of the second current collector, the second current collector forms a second electrode output end, which is electrically connected to the other one of the housing or the pole.

Abstract: A cell including an electrode assembly, a packaging bag, an inner electrode tab, and an outer electrode tab. The packaging bag includes a main body and an edge sealing portion, the electrode assembly and the inner electrode tab being received in the main body. The edge sealing portion is connected to a top wall of the main body, the other end of the outer electrode tab extends out of the packaging bag from the edge sealing portion. The top wall includes a first portion and a second portion disposed on both sides of the edge sealing portion in the thickness direction of the cell. A height from the first portion to a bottom wall of the main body is less than a height from the second portion to the bottom wall.

Abstract: A battery includes a housing; an insulation member; and a first active substance layer and a second active substance layer having opposite polarities. The housing includes a first wall body, a second wall body, and a third wall body, forming an accommodation cavity. The first wall body is a conductive wall body and disposed opposite to the third wall body. The insulation member, the first active substance layer, and the second active substance layer are accommodated in the accommodating cavity. The second active substance layer is disposed on a surface of the first wall body that faces the third wall body. The first active substance layer is disposed between the second active substance layer disposed on the surface of the first wall body and the third wall body. The insulation member is disposed between the first active substance layer and the second active substance layer.

Abstract: A battery includes a housing, a battery cell, and a first conductive member. The housing is provided with an accommodating cavity, and the battery cell is accommodated in the accommodating cavity. The first conductive member includes a first terminal part located outside the housing, and a first connecting part connected to the first terminal part and located inside the housing. The battery cell includes an electrode assembly and N first tabs protruding from the electrode assembly, where N is an integer greater than 1. The N first tabs are divided into M first tab groups. The first tab groups are mutually separately connected to one side of the first connecting part facing the electrode assembly. M is an integer greater than or equal to 1 and less than or equal to N.

Abstract: A separator includes a separator substrate, and a first coating and a second coating respectively disposed on two surfaces of the separator substrate, where the first coating includes polymer secondary particles, and the secondary particles have a melting point of 130° C. to 150° C. The first coating in the separator has good adhesion and resistance to electrolyte swelling, and the secondary particles have many internal voids, which facilitates the penetration of the electrolyte, thus improving electrolyte penetration into the first coating and enhancing the low-temperature performance of the electrochemical apparatus.

Abstract: A separator includes a substrate and a first coating layer disposed on at least one surface of the substrate. The first coating layer includes a first polymer. Based on a total mass of the first coating layer, a mass percent x of the first polymer is 60 wt % to 90 wt %. A softening point of the first polymer is 90° C. to 150° C. The separator of this application possesses excellent interfacial bonding strength, and improves kinetic performance of a lithium-ion battery, and especially cycle performance of the battery under a low-temperature condition.

Abstract: A battery cell, including an electrode assembly and a housing accommodating the electrode assembly. The housing includes a cavity and a cover covering the cavity. The cavity includes a flange extending along a border of an opening of the cavity. Periphery of the cover is connected to the flange to form a side wing to seal the cavity. The battery cell further includes a tab sandwiched between the side wings and extending out of the housing along the side wings. The side wing has a first sealing structure and a second sealing structure. A direction from an edge, away from the border, of the side wing to the border is defined as a first direction, and the second sealing structure exceeds the first sealing structure in the first direction.

Abstract: A binder includes a polymer, the polymer is obtained by polymerizing a first monomer, a second monomer, a third monomer, and a fourth monomer, where the first monomer, the second monomer, and the third monomer are each independently selected from aromatic alkenyl compounds, ethylenically unsaturated carboxylic acids, ethylenically unsaturated carboxylic acid salts, or ethylenically unsaturated carboxylates, and the fourth monomer is selected from a substituted or unsubstituted cyclic compound having at least one double bond. The addition of the fourth monomer in this application can enhance the tensile strength and adhesive strength of the binder, suppress the volume expansion of electrode plates, and enable the formation of a networked structure in the polymer, improving the electrolyte resistance performance and consequently increasing the cycle life of batteries.