CATL

This application provides an electrolyte for lithium-ion secondary battery and a battery. The electrolyte includes a solvent, an additive composition, and a lithium salt. The additive composition includes a compound of formula I and at least one of compounds of formula II and formula III. The resulting battery has a high voltage and exhibits good cycling performance and storage performance at high temperature. <img class="EMIRef" id="4c42c2a9-2876-4caa-84d2-2032ba1e3e8f-ia01" /> In the formulas, the symbols are as defined in the specification.

Provided in the present application is a modified high-nickel ternary positive electrode material, containing a core, an inner coating layer and an outer coating layer. The core contains a high-nickel ternary positive electrode material matrix, which is doped with M1, M2 and W, wherein M1 is one of Mo, Zr, Ti, Sb, Nb and Te; and M2 is one of Mg, Al, Ca, Zn and Sr. The chemical formula of the high-nickel ternary positive electrode material matrix doped with M1, M2 and W is Li<1+a>[Ni<x>Co<y>Mn<z>M1<b>M2<c>W<d>]O<2>, wherein 0.65 ≤ x < 1; 0 ≤ y < 0.3; 0 ≤ z < 0.3; 0 < a < 0.2; 0< b < 0.1; 0 < c < 0.1; 0 < d < 0.1; x + y + z + b + c + d = 1; and optionally, 0.8 ≤ x < 1. The surface layer of the core is further doped with Co. The inner coating layer is a Co-containing compound, and the outer coating layer is an Al-containing compound and a B-containing compound. The present application also relates to a method for preparing a modified high-nickel ternary positive electrode material, and a secondary battery, a battery module, a battery pack and a power-consuming apparatus.

This application provides an electrode assembly and a manufacturing method thereof, a battery cell, a battery, and an electric apparatus. The electrode assembly includes a first electrode plate, and separators provided on two sides of the first electrode plate in a thickness direction of the electrode plate and stacked with the first electrode plate; where in an unfolded state of the electrode assembly, the separator has first edge portions each exceeding an end of the first electrode plate in a length direction of the separator, and the separator has second edge portions each exceeding an end of the first electrode plate in a height direction of the separator; and in the thickness direction of the electrode plate, the corresponding first edge portions on two sides of the first electrode plate are at least partly hot-melt connected to form first hot-melted segments, and the corresponding second edge portions on two sides of the first electrode plate are at least partly hot-melt connected to form second hot-melted segments. The technical solution in this application can enhance the electrochemical performance of batteries and improve the safety and reliability of batteries.

An embodiment of the present application provides an electrode assembly, a battery cell, a battery, and an electrode assembly manufacturing device and method, which belong to the technical field of batteries. The electrode assembly includes a negative electrode plate and a positive electrode plate, the negative electrode plate and the positive electrode plate being wound in a winding direction to form a winding structure, the winding structure including a bending area. Both the negative electrode plate and the positive electrode plate include a plurality of bending portions located in the bending area. At least one bending portion in the negative electrode plate is a first bending portion, and an active substance capacity per unit area outside the first bending portion is greater than an active substance capacity per unit area inside the first bending portion; and/or, at least one bending portion in the positive electrode plate is a second bending portion, and an active substance capacity per unit area outside the second bending portion is greater than an active substance capacity per unit area inside the second bending portion. In the electrode assembly of this structure, the active substance arrangement in at least part area of the bending area of the electrode plate is more reasonable with better economic efficiency.

Provided in the embodiments of the present application are a power management system, an MCU, a BMS and a battery, which can satisfy the power supply requirements of the MCU, and achieve a higher reliability. The power management system comprises: a primary power supply module, which is connected to a power source, and is used for generating a first voltage according to the voltage of the power source, diagnosing the first voltage, and storing a diagnosis result of the first voltage; and a secondary power supply module, which is connected to the primary power supply module and is used for generating a second voltage according to the first voltage, wherein the second voltage is less than the first voltage, and the second voltage is an operating voltage of an MCU; and the MCU, which is connected to the primary power supply module and the secondary power supply module, and is used for reading the diagnosis result of the first voltage from the primary power supply module and determining, according to the diagnosis result of the first voltage, whether to control a BMS to enter a safe state.

The present application discloses a positive electrode active material and a preparation method thereof, a positive electrode plate, a lithium-ion secondary battery and a battery module, a battery pack and an apparatus related thereto. The positive electrode active material includes a lithium nickel cobalt manganese oxide, the molar content of nickel in the lithium nickel cobalt manganese oxide accounts for 60% - 90% of the total molar content of nickel, cobalt and manganese, and the lithium nickel cobalt manganese oxide has a layered crystal structure of a space group R 3m; a transition metal layer of the lithium nickel cobalt manganese oxide includes a doping element, and the local mass concentration of the doping element in particles of the positive electrode active material has a relative deviation of 20% or less; and in a differential scanning calorimetry spectrum of the positive electrode active material in a 78% delithiation state, an initial exothermic temperature of a main exothermic peak is 200°C or more, and an integral area of the main exothermic peak is 100 J/g or less.

This disclosure discloses a storage and charging integrated apparatus, a charging control method, a charging pile, and a charging system. The storage and charging integrated apparatus includes an energy storage module, a direct-current conversion module, and a charging module; where an input terminal of the direct-current conversion module is configured to receive a first charging power input from an external source; a first output terminal of the direct-current conversion module is connected to a first terminal of the charging module, a second output terminal of the direct-current conversion module is connected to a first terminal of the energy storage module, and a second terminal of the charging module is connected to a second terminal of the energy storage module; and the charging module is connected in series with the direct-current conversion module and the energy storage module, and is configured to output or receive electric energy to or from a to-be-charged device. In this way, the storage and charging integrated apparatus can achieve voltage adaptation with various devices to be charged, which expands the scope of application of the storage and charging integrated apparatus and improves the charging efficiency.

Provided in the present application is a modified high-nickel ternary positive electrode material, containing a core, an inner coating layer and an outer coating layer. The core contains a high-nickel ternary positive electrode material matrix, which is doped with M1, M2 and W, wherein M1 is one of Mo, Zr, Ti, Sb, Nb and Te; and M2 is one of Mg, Al, Ca, Zn and Sr. The chemical formula of the high-nickel ternary positive electrode material matrix doped with M1, M2 and W is Li<1+a>[Ni<x>Co<y>Mn<z>M1<b>M2<c>W<d>]O<2>, wherein 0.65 ≤ x < 1; 0 ≤ y < 0.3; 0 ≤ z < 0.3; 0 < a < 0.2; 0< b < 0.1; 0 < c < 0.1; 0 < d < 0.1; x + y + z + b + c + d = 1; and optionally, 0.8 ≤ x < 1. The surface layer of the core is further doped with Co. The inner coating layer is a Co-containing compound, and the outer coating layer is an Al-containing compound and a B-containing compound. The present application also relates to a method for preparing a modified high-nickel ternary positive electrode material, and a secondary battery, a battery module, a battery pack and a power-consuming apparatus.

The present application provides a bracket (100), a battery assembly (10), an electric apparatus (1), and a preparation method and device (6) of the battery assembly (10), and relates to the field of batteries. The bracket (100) is configured to be connected to a battery (300) and an electric apparatus (1) body; the battery (300) includes a first connector (310) for outputting electric energy; and the bracket (100) includes a bracket body (110) and a second connector (140). The bracket body (110) is configured to fix the battery (300). The second connector (140) is mounted on the bracket body (110); and a connecting end of the second connector (140) faces towards a gravity direction, so that the first connector (310) can be butted with the second connector (140) along the opposite direction of the gravity direction, thereby realizing electric connection between the first connector (310) and the second connector (140). Such a structure will not damage the first connector (310) and/or the second connector (140) due to the gravity of the battery (300) so as not to affect the use of the battery (300) or the electric apparatus (1). In the process of mounting the battery (300) , the first connector (310) can be butted with the second connector (140) only by pushing the battery (300) to move along the opposite direction of the gravity, which is convenient and fast.

This disclosure relates to the field of electrochemistry, and in particular, to a positive electrode material. The positive electrode material of this disclosure includes a substrate, with a formula of the substrate being Li<x>Ni<y>Co<z>M<k>Me<p>O<r>A<m>, where 0.95 ≤ x ≤ 1.05, 0.50 ≤ y ≤ 0.95, 0 ≤ z ≤ 0.2, 0 ≤ k ≤ 0.4, 0 ≤ p ≤ 0.05, 1 ≤ r ≤ 2, 0 ≤ m ≤ 2, m+r ≤ 2; a coating layer is disposed on the substrate, where the coating layer includes a coating element; absorbance of nickel leachate per unit mass of the positive electrode material w ≤ 0.7; the coating layer comprises an inner coating layer, the inner coating layer is located on surfaces of at least some primary particles inside the substrate, and the inner coating layer comprises a coating element, wherein the coating element of the inner coating layer is selected from one or more of Al, Zr, Ba, Zn, Ti, Co, W, Y, Si, Sn, B, and P; and wherein the coating layer comprises an outer coating layer, the outer coating layer is located on a surface of the substrate, and the outer coating layer comprises a coating element, wherein the coating element of the outer coating layer is selected from one or more of Al, Zr, Ba, Zn, Ti, Co, W, Y, Si, Sn, B, and P.