Abstract: In a lithium-ion battery, the lithium ion migration kinetic coefficient Fc of the positive electrode coating and the lithium ion migration kinetic coefficient Fa of the negative electrode coating satisfy: 0.25?Fc/Fa?5; Fc=2 (Dvc50+5Mc)+PDc/4Pc, Fa=Dva50+Ma+PDa/2Pa, Dvc50 is an average particle size of a positive active material in the positive electrode coating; Mc is an internal resistance of the positive electrode plate; PDc is a compaction density of the positive electrode coating; Pc is a porosity of the positive electrode coating; Dva50 is an average particle size of a negative active material in the negative electrode coating; Ma is an internal resistance of the negative electrode plate; PDa is a compaction density of the negative electrode coating; Pa is a porosity of the negative electrode coating. The rates of lithium ion deintercalation from the positive electrode coating and lithium ion intercalation into the negative electrode coating are balanced, thereby ensuring charging capacity.

Abstract: The present application belongs to the technical field of batteries, and particularly relates to a secondary battery. The secondary battery provided by the present application comprises a positive electrode plate, a negative electrode plate and electrolyte, wherein the electrolyte comprises an organic solvent, and the organic solvent comprises a cyclic ester solvent and a chain ester solvent; the secondary battery parameter satisfies Formula (1). The secondary battery has good dynamic performance at low temperature, and has good capacity retention rate and lower impedance under the low temperature condition by adjusting the electrolyte and the negative electrode plate and the combined action of the electrolyte and the negative electrode plate.

Abstract: Disclosed are a secondary battery and a battery pack including the secondary battery. The secondary battery includes a negative electrode plate, the negative electrode plate includes a negative electrode current collector and a negative electrode active material layer disposed on at least one surface of the negative electrode current collector, the negative electrode active material layer includes a negative electrode active material. A grain size of the negative electrode active material is XS nm, a non-Faraday capacitance of the negative electrode plate is Cdl nF, satisfying 0.05?Cdl?10, and a relationship of the grain size XS and the non-Faraday capacitance Cdl satisfies 0.1??{square root over (Cdl-XS)}?3.

Abstract: Disclosed are a secondary battery and a battery pack. In the secondary battery, a negative active material layer is disposed on a current collector of a negative electrode sheet, the negative electrode active material layer comprises a negative active material, and the negative electrode sheet has a non-faradaic specific capacitance value of 50-250 nF/g, thereby ensuring the quantity of electrochemical active sites on the surface of the negative electrode sheet, facilitating the contact between the negative electrode sheet and an electrolyte, accelerating the ion-electron conduction rate, reducing the charge transfer resistance, effectively improving the charging rate capability of the secondary batteryimproving the current density of the negative electrode sheet, improving the energy density of the secondary battery, and realizing excellent dynamic performance and cycle performance of the secondary battery.

Abstract: A secondary battery and a power consumption device are provided in the present application. The secondary battery includes a positive electrode plate, a negative electrode plate, a separator, and an electrolyte solution. The negative electrode plate has a non-faradaic capacitance Cdl nF satisfying 1?Cdl?5. The electrolyte solution includes an additive, and the additive includes a silicon-containing compound. In the present application, by reasonably adjusting the relationship between the non-faradaic capacitance of the negative electrode plate and content of the additive in the electrolyte solution, the secondary battery has characteristics of high capacity and rapid charging.

Abstract: Disclosed are batteries and electrical apparatuses. Non-faradaic capacitance of the negative electrode plate is Cdl nF, the sphericity of the negative active material contained in the negative electrode plate is S, and Cdl and S satisfy 0.5?Cdl×S?5. By adjusting Cdl value and sphericity S, so that they are in the range of 0.5?Cdl×S?5, which can effectively reduce the specific surface area of the negative active material, increase the tap density, so that the negative electrode plate has a high tap density without causing overpressure phenomenon. Furthermore, the mechanical stress experienced by the negative active materials of the negative electrode plate during rolling is minimized, and the reaction area with the electrolyte is minimized, it has good liquid retention properties, thereby avoiding the occurrence of gas generation and swelling, so that the batteries have excellent rate performance and cycle performance.

Abstract: A secondary battery and an electrochemical device are provided. The secondary battery includes a positive electrode plate, a separator, an electrolyte solution, and a negative electrode plate. The negative electrode plate includes a negative electrode current collector, and a negative electrode active material layer disposed on the negative electrode current collector. Non-faradaic electric quantity Q C of the negative electrode plate satisfies: 0.05?Q?2.5, wherein Q=Cdl×?U, Cdl nF is non-faradaic capacitance of the negative electrode plate, and ?U V is potential interval of the negative electrode active material layer.

Abstract: A folding pallet truck comprises a frame module, a lifting module installed on the frame module and comprising a mount, and a handle module comprising a tube in rotating fit with the mount, wherein a first constraint part is formed between an end, rotatably connected to the mount, of the tube and the mount, and the handle module is folded by detaching the first constraint part or is unfolded by reassembling the first constraint part. The handle module can be folded to be stored or be unfolded and locked to be used by detaching or reassembling the first constraint part formed between the tube of the handle module and the mount of the lifting module, operation is easy, and the pallet truck has a small size when stored.

Abstract: A folding pallet truck comprises a frame module, a lifting module installed on the frame module and comprising a mount, and a handle module comprising a tube in rotating fit with the mount, wherein a first constraint part is formed between an end, rotatably connected to the mount, of the tube and the mount, and the handle module is folded by detaching the first constraint part or is unfolded by reassembling the first constraint part. The handle module can be folded to be stored or be unfolded and locked to be used by detaching or reassembling the first constraint part formed between the tube of the handle module and the mount of the lifting module, operation is easy, and the pallet truck has a small size when stored.

Abstract: The present disclosure provides a lithium-ion secondary battery and an electrolyte thereof. The electrolyte comprises a lithium salt; a non-aqueous solvent and an additive comprising a first additive and a second additive, the first additive comprises at least one of vinylene carbonate and vinyl ethylene carbonate, the second additive is 4-methylene-1,3-dioxolan-2-one and its derivatives with a structural formula 1 and/or 4,5-dimethylene-1,3-dioxolan-2-one and its derivatives with a structural formula 2; in the structural formula 1 and the structural formula 2, R1, R2, R3 and R4 each are hydrogen, halogen, C1˜C3 alkyl or halogenated alkyl; a weight percentage of the first additive in the electrolyte is 0.2%˜2.0%, a weight percentage of the second additive in the electrolyte is 0.3%˜4.0%. The lithium-ion secondary battery comprises the aforementioned electrolyte.

Abstract: The present disclosure provides a lithium-ion battery and an electrolyte thereof. The electrolyte of the lithium-ion battery comprises: a non-aqueous organic solvent; a lithium salt discloved in the non-aqueous organic solvent; and an additive dissolved in the non-aqueous organic solvent. The additive comprises 1,3-dioxo-heterocyclic compound with a structural formula I and fluoroethylene carbonate; in the structural formula I, R1 and R2 each independently are H, methyl or ethyl; n is an integer selected from 1˜3; a weight percentage of 1,3-dioxo-heterocyclic compound with the structural formula I in the electrolyte of the lithium-ion battery is 0.05%˜5%; a weight percentage of fluoroethylene carbonate in the electrolyte of the lithium-ion battery is 1%˜8%. The lithium-ion battery comprises the aforementioned electrolyte of the lithium-ion battery.

Abstract: The present disclosure provides a lithium ion secondary battery and electrolyte solution thereof. The electrolyte solution of the lithium ion secondary battery includes a nonaqueous organic solvent, and a lithium salt dissolved in the nonaqueous organic solvent. The nonaqueous organic solvent includes a dicyano ester compound of a structure shown by Formula I, Formula II, or Formula III. Formula I represents dicyano carbonate ester compounds, Formula II represents dicyano sulfite ester compounds, Formula III represents dicyano sulfate ester compounds, and the value n is an integer between 1 and 4. The lithium ion secondary battery according to the present disclosure includes the aforementioned electrolyte solution. At a working voltage of 4.3 V or higher, the lithium ion secondary battery according to the present disclosure can effectively suppress the oxidation of the electrolyte solution and improve the storage performance of the lithium ion secondary battery at high temperature.

Abstract: The present disclosure provides a lithium-ion secondary battery and an electrolyte thereof. The electrolyte comprises a lithium salt; a non-aqueous solvent and an additive comprising a first additive and a second additive, the first additive comprises at least one of vinylene carbonate and vinyl ethylene carbonate, the second additive is 4-methylene-1,3-dioxolan-2-one and its derivatives with a structural formula 1 and/or 4,5-dimethylene-1,3-dioxolan-2-one and its derivatives with a structural formula 2; in the structural formula 1 and the structural formula 2, R1, R2, R3 and R4 each are hydrogen, halogen, C1˜C3 alkyl or halogenated alkyl; a weight percentage of the first additive in the electrolyte is 0.2%˜2.0%, a weight percentage of the second additive in the electrolyte is 0.3%˜4.0%. The lithium-ion secondary battery comprises the aforementioned electrolyte.

Abstract: The present disclosure provides a lithium-ion secondary battery and an electrolyte thereof. The electrolyte of the lithium-ion secondary battery comprises a lithium salt; a non-aqueous solvent and an additive. The additive comprises a first additive and a second additive, the first additive is 1,3-propane sultone (PS), the second additive is 4-methylene-1,3-dioxolan-2-one and its derivatives with a structural formula 1 and/or 4,5-dimethylene-1,3-dioxolan-2-one and its derivatives with a structural formula 2; in the structural formula 1 and the structural formula 2, R1, R2, R3 and R4 each are hydrogen, halogen, C1˜C3 alkyl or halogenated alkyl; a weight percentage of the first additive in the electrolyte is 0.3%-4.0%, a weight percentage of the second additive in the electrolyte is 0.3%-4.0%. The lithium-ion secondary battery comprises the aforementioned electrolyte. The lithium-ion secondary battery of the present disclosure has better low temperature discharging performance.

Abstract: A lithium-ion battery, comprises an anode plate, a cathode plate, a separator and electrolyte, wherein the separator is arranged between the anode plate and the cathode plate. The anode plate comprises an anode current collector and an anode active material layer. The anode current collector is provided with an anode coating area and an anode blank area, and the anode active material layer is coated on the anode coating area. The cathode plate comprises a cathode current collector and a cathode active material layer. The cathode current collector is provided with a cathode coating area and a cathode blank area, and the cathode active material layer is coated on the cathode coating area. When both the anode blank area and the cathode blank area are coated with a polymer layer, the two polymer layers are mutually contacted.

Abstract: The present disclosure provides a lithium-ion secondary battery and an electrolyte thereof. The electrolyte comprises a lithium salt, a non-aqueous solvent, and an additive at least containing 1,3-propyl sultone (PS) and a compound of isocyanurate structure represented by formula (1), formula (2) or formula (3); in formula (1), n is a positive integer from 1 to 3; in formula (2), n is a positive integer from 1 to 3, R1 is an alkyl of linear chain or branched chain having carbon atoms from 1 to 6, hydrogen atoms in the alkyl can be substituted by fluorine atoms partly or wholly; in formula (3), n is a positive integer from 1 to 3, R1 and R2 are alkyls of linear chain or branched chain having carbon atoms from 1 to 6, hydrogen atoms in the alkyls can be substituted by fluorine atoms partly or wholly.