Xiamen Hithium Energy Storage Technology

The present disclosure provides a separator, a battery, an energy storage device, and an electric equipment comprising the same. The separator comprises a substrate film and a dot-coated adhesive layer, wherein the dot-coated adhesive layer is disposed on at least one surface of the substrate film. The dot-coated adhesive layer comprises a plurality of adhesive dots distributed in a dot matrix, and the adhesive dots have a first annular structure. The distance between an outer edge of the first annular structure and a center of the adhesive dot is R<1>, the distance between an inner edge of the first annular structure and the center of the adhesive dot is R<2>, and 0.15≤1-R<2>/R<1>≤0.35. The dot-coated adhesive layer comprises a polymer binder and an auxiliary agent, and the auxiliary agent comprises at least one of a water-soluble coupling agent and a phosphate-based auxiliary agent.

The present application relates to an active material, a negative electrode sheet, a battery and electric equipment. The active material has a first stability coefficient α1 and a second stability coefficient α2, and the active material satisfies the following relationships: α1 = Dv50 - Dv50', 0 ≤ α1 ≤ 1 µm; and α2 = Dn50 - Dn50', 0 ≤ α2 ≤ 0.04 µm; wherein Dv50 is a particle size of the active material measured when a cumulative volume fraction in volume-based distribution reaches 50%, Dv50' is a particle size of the active material measured when a cumulative volume fraction in volume-based distribution reaches 50% after a 5-ton powder compaction test; Dn50 is a particle size of the active material measured when a cumulative number fraction in number-based distribution reaches 50%; and Dn50' is a particle size of the active material measured when a cumulative number fraction in number-based distribution reaches 50% after a 5-ton powder compaction test.

The present application provides a cylindrical battery, an energy storage device and an energy storage system. The cylindrical battery of the present application comprises: an electrolyte solution, and an electrode assembly. The electrolyte solution comprises an electrolyte salt and an organic solvent. The electrolyte salt has a mass fraction of y wt% in the electrolyte solution. The electrode assembly comprises an electrode sheet. The electrode sheet comprises a current collector and a plurality of tabs electrically connected to the current collector. The plurality of tabs are spaced on a same side of the current collector, with the spacing between two adjacent tabs being d in mm. The electrode assembly has a winding structure. The electrode assembly has a central hole with a diameter of L in mm. The battery also satisfies the relationship d=10k₁·y-L, wherein k₁ has a range satisfying 3.7 mm ≤ k₁ ≤ 17.14 mm. The cylindrical battery of the present application has relatively long cycle life.

The present disclosure provides a battery, an energy storage device, and an energy storage system. The battery of the present disclosure includes a positive electrode sheet, a separator, and a negative electrode sheet. The separator is disposed between the positive electrode sheet and the negative electrode sheet. The separator includes a substrate film, a first adhesive layer, and a second adhesive layer. The first adhesive layer is disposed between the substrate film and the positive electrode sheet for bonding the substrate film to the positive electrode sheet, and the second adhesive layer is disposed between the substrate film and the negative electrode sheet for bonding the substrate film to the negative electrode sheet. The battery satisfies the relationship: 0.85≤(Fc·Wc)/(Fa·Wa)≤6.36; where Fc is the peel strength between the first adhesive layer and the positive electrode sheet, Wc is the coating amount per unit area of the first adhesive layer on the substrate film, Fa is the peel strength between the second adhesive layer and the negative electrode sheet, and Wa is the coating amount per unit area of the second adhesive layer on the substrate film.

The present disclosure relates to the technical field of batteries, and more particularly, to a graphite and a preparation method thereof, a negative electrode plate, a secondary battery, and an energy storage device. The graphite has a first structural stability coefficient X1. The first structural stability coefficient X1 satisfies X1=(Dv90-Dv50)/(Dv90'-Dv50'), and 0.90≤X1≤1.80, where: Dv90 represents a particle size value prior to roller pressing at which 90% volume of particles of the graphite are smaller; Dv50 represents a particle size value prior to the roller pressing at which 50% volume of the particles of the graphite are smaller; Dv90' represents a particle size value subsequent to the roller pressing at which 90% volume of the particles of the graphite are smaller; and Dv50' represents a particle size value subsequent to the roller pressing at which 50% volume of the particles of the graphite are smaller.

The present disclosure provides an energy storage system, a control method thereof, and a power consumption system. The energy storage system includes a first energy storage sub-system (210), a second energy storage sub-system (220), and a power conversion system (120). The first energy storage sub-system is provided with a first battery system (211) and a first battery management system (212); the second energy storage sub-system (220) is provided with a second battery system and a second battery management system (223), and the second battery system includes a first battery sub-cluster (221) and a second battery sub-cluster (222). The power conversion system (120) is electrically connected to the first battery system and the first battery sub-cluster or the second battery sub-cluster, and the power conversion system is communicatively connected to the first battery management system; the first battery management system performs coordinated charge and discharge control on the first battery sub-cluster.

An energy-storage apparatus (100), an energy-storage module (1000), and an electricity-consumption device are provided in the disclosure. The energy-storage apparatus (100) includes a housing (110), an electrode assembly (120), and a cover plate (20). The electrode assembly (120) is accommodated in an accommodating cavity (112) of the housing (110). The cover plate (20) is mounted to the housing (110) and seals an opening (111) of the housing (110). The cover plate (20) includes a main body portion (21) and a boss portion (22). The main body portion (21) has a first surface (211) and a second surface (212) opposite to the first surface (211). The boss portion (22) is fixedly connected to the main body portion (21) and protrudes relative to the first surface (211). The boss portion (22) has a first face (221) facing away from the electrode assembly (120) and a second face (222) opposite to the first face (221).

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