CATL Patente

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.

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.

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 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.

The present application discloses an electrolyte solution, a secondary battery, a battery module, a battery pack and a powered device. The electrolyte solution comprises an organic solvent and an additive, the organic solvent comprises a first organic solvent shown in Formula 1, and the additive comprises a first additive selected from one or more of compounds represented by Formula 2A and Formula 2B. In Formula 1, R<1> and R<2> are each independently one of C1-C3 alkyl and C1-C3 haloalkyl; in Formula 2A, R<21>, R<22>, R<23>, and R<24> are each independently one of single bond and methylene; in Formula 2B, R<31>, R<32>, R<33>, and R<34> are each independently one of a single bond and methylene, and R<4> is one of a single bond, -O-, C1-C3 alkylene, C1-C3 haloalkylene, and C1-C3 oxaalkylene. The secondary battery of the present application has good fast charging performance while ensuring long cycle life and storage life. <img class="EMIRef" id="a7fb7e6d-80ee-4e58-b84d-aa307d6443be-ia01" /> <img class="EMIRef" id="a7fb7e6d-80ee-4e58-b84d-aa307d6443be-ia02" /> <img class="EMIRef" id="a7fb7e6d-80ee-4e58-b84d-aa307d6443be-ia03" />

This application discloses a rotary dehumidification device, and relates to the field of air conditioning technology. The rotary dehumidification device includes a dehumidification passage, a regeneration passage, a dehumidification module, and an indoor air passage, where the dehumidification passage has a fresh air inlet and an exhaust outlet; the regeneration passage has a first air intake position and a moisture exhaust outlet; the dehumidification module includes a rotatably arranged primary dehumidification rotor, where the primary dehumidification rotor has a first moisture absorption zone and a first regeneration zone arranged along a circumferential direction of the primary dehumidification rotor, the first moisture absorption zone is located between the fresh air inlet and the exhaust outlet, and the first regeneration zone is located between the moisture exhaust outlet and the first air intake position; and the indoor air passage is in communication with the first air intake position. The technical solution of this application facilitates regulation of indoor humidity and air pressure.

The present application is applicable to the field of battery technologies, and provides a battery device (100), an energy storage device, and an electric device. The battery device includes: a box body (10); a battery cell (20), accommodated in the box body; and an electric control assembly (30), accommodated in the box body. The electric control assembly includes a bracket (31) and an electric control component. The bracket includes a bracket body (311). A side that is of the bracket body and that faces the battery cell is connected to a protruding structure (312), and a side that is of the bracket body and that is away from the battery cell is provided with the electric control component. The electric control assembly further includes a heat insulation plate (32) disposed on the side that is of the bracket body and that faces the battery cell. The heat insulation plate, the bracket body, and the protruding structure enclose to form a cavity. In the battery device provided in embodiments of the present application, the protruding structure is disposed on the side that is of the bracket body and that faces the battery cell, and the heat insulation plate, the protruding structure, and the bracket body enclose to form the cavity, so that the cavity and the heat insulation plate jointly function to hinder heat transfer and provide a heat insulation effect.

The present application provides a battery apparatus, an energy storage apparatus, and an electric apparatus. A battery apparatus (200) includes a battery cell (300) and an electronic control assembly (400). The electronic control assembly includes a circuit board (51), a housing (40), and a covering structure (53). The circuit board is provided with a connector receptacle (52). The housing (40) is provided with an accommodating cavity (401), the circuit board (51) is installed in the accommodating cavity (401), and the housing (40) is provided with an opening (402) for the connector receptacle (52) to extend out. The covering structure (53) is disposed on the housing (40) and at least partially covers a gap (403) between the connector receptacle (52) and a side wall of the opening (402). The gap (403) between the connector receptacle (52) and the side wall of the opening (402) is covered, reduced, or occluded by using the covering structure (53), so that the electronic control assembly meets requirements of a required protection level.

This application provides a battery current collector and a preparation method thereof, a secondary battery, a battery module, a battery pack, and an electric apparatus. The battery current collector includes a foam metal layer (1) and a strength enhancement layer (2), where the strength enhancement layer (2) is a sheet-shaped metal layer, and the strength enhancement layer (2) and the foam metal layer (1) are stacked and metallurgically bonded, alleviating a problem of poor mechanical performance of current collectors in the related art. The strength enhancement layer (2) and the foam metal layer (1) are connected by metallurgical bonding, which helps ensure not only structural strength of the strength enhancement layer (2) and the foam metal layer (1), but also good conductivity between the strength enhancement layer (2) and the foam metal layer (1). Further, the manner of metallurgical bonding helps reduce production costs.

Provided in the embodiments of the present application are a battery cell, a battery, and an electric device. The battery cell comprises a housing, an electrode assembly, a first electrode terminal and a cover plate. The housing comprises a cylindrical body and a cover body, which are integrally formed, and one end of the cylindrical body away from the cover body is provided with an opening. The electrode assembly is accommodated inside the housing and comprises a first tab. The first electrode terminal is arranged on the cover body and is used for being electrically connected to the first tab. The cover plate is connected to the cylindrical body and covers the opening. By means of mounting the first electrode terminal on the cover body, the space between the position, where the cylindrical body and the cover plate are connected to each other, and the first electrode terminal can be increased, such that effect on the position, where the cylindrical body and the cover plate are connected to each other, is reduced when the battery cell is subjected to an external impact, the risk of connection failure between the cover plate and the housing is reduced, and electrolyte leakage is reduced, thereby improving the safety.

This application relates to a secondary battery, and a battery module, a battery pack, and an electric apparatus containing the same. The secondary battery includes: an electrolyte having a specific percentage of a low-viscosity solvent, a specific percentage of a high-dielectric-constant solvent, and a negative electrode having a negative electrode active material layer, and the secondary battery satisfies the relational expression: 1×10−4≤B×C×POI×CW≤1×10−3, where B is the percentage of the low-viscosity solvent in total solvent in the electrolyte by mass; C is a percentage of an electrolyte salt in the electrolyte by mass; P is a porosity of the negative electrode active material layer; CW is a coating weight of the negative electrode active material layer, measured in mg/cm²; and OI is an orientation index of the negative electrode active material layer, where OI=C004/C 110, C004 is a peak area of a 004 characteristic diffraction peak in an X-ray diffraction pattern of the negative electrode active material layer, and C110 is a peak area of a 110 characteristic diffraction peak in the X-ray diffraction pattern of the negative electrode active material layer.

Embodiments of the present application provide a battery cell and a manufacturing method and device therefor, a battery, and an electric device. A battery cell (100) comprises: an electrode assembly (1) comprising a main body part (11) and a tab (12), the tab (12) being connected to a side portion of the main body part (11) in a first direction (X); and a protective frame (2) having an integrated structure and comprising three sections of protective plates which are respectively used for protecting three side surfaces of the main body part (11), the three sections of protective plates comprising a first plate (21), a second plate (22), and a third plate (23), the third plate (23) being located between the first plate (21) and the second plate (22), two ends of the third plate (23) being respectively connected to a first end of the first plate (21) and a first end of the second plate (22), and at least one of the first plate (21), the second plate (22), and the third plate (23) being provided with an opening (231), wherein the tab (12) is led out from the opening (231).

This application provides a composite positive-electrode material and a preparation method thereof, a positive-electrode plate, a secondary battery (5), and a battery module (4), a battery pack (1), and an apparatus containing such secondary battery (5). The composite positive-electrode material includes a core and a coating layer covering at least part of a surface of the core, where the core includes a positive-electrode pre-lithiation material, the positive-electrode pre-lithiation material includes a lithium-rich metal oxide, and the coating layer includes a positive-electrode active material.

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