Sunwoda Mobility Energy Technology Patente

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A positive electrode active material, a secondary battery, and an electric device. The positive electrode active material includes a secondary particle agglomerated by primary particles. In the SEM image of cross-section of the secondary particle, the number of grain boundaries per unit cross-sectional area is α line/µm², the length of grain boundaries per unit cross-sectional area is β µm/µm², and the secondary particle satisfies: 0.15 ≤ β/α ≤ 0.4. By adjusting the number of grain boundaries and length of grain boundaries, the stress release ability of material structure is enhanced, the oxygen stability of material is improved, and the cycle life of secondary battery is further extended and the performance of gas production and kinetic properties are improved.

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A battery cell and a battery module. The battery cell includes a housing; and an electrode assembly accommodated in the housing. The electrode assembly includes a positive electrode sheet, a separator, and a negative electrode sheet that are stacked together, the separator is provided between the positive electrode sheet and the negative electrode sheet, and the positive electrode sheet, the negative electrode sheet, and the separator are wound together to form the electrode assembly. The negative electrode sheet includes: a negative electrode substrate; a negative electrode active material layer coated on the negative electrode substrate; and a negative electrode tab extending in a first direction and connected to the negative electrode substrate. The battery cell satisfies: 2.702 ≤ 2H₁-2T₁×n-(T₂-T₃) ≤ 19.958. According to the present application, the cycle life of the battery cell is enhanced, and the comprehensive performance of the battery cell is further improved.

A secondary battery and an electrical apparatus. The secondary battery includes a positive electrode material, and satisfies: I<200>/I<1>≥0.62, where I<200> represents an oxidation peak intensity of an H2-H3 phase transition of the positive electrode material in a dQ/dV graph of the secondary battery after 200 charge/discharge cycles at 1C at a constant temperature of 60°C, and I<1> represents an oxidation peak intensity of an H2-H3 phase transition of the positive electrode material in a dQ/dV graph of the secondary battery after a single charge/discharge cycle at 1C at a constant temperature of 60°C. After the secondary battery is subjected to 200 charge/discharge cycles at 1C at a constant temperature of 60°C, if a reversibility of the H2-H3 phase transition of the positive electrode material in a dQ/dV graph satisfies I<200>/I<1>≥0.62, the positive electrode material has a stable cycling performance, thus the secondary battery has an excellent cycling stability.

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Provided herein is a secondary battery and an electrical device. The secondary battery satisfies a relationship of formula (1): 0.15 ≤ Me . × A × σ × α η × PD ≤ 10 <img class="EMIRef" id="cb9e2178-1d08-4946-939c-774a6b05225c-ia01" /> Me. represents an electrolyte retention coefficient of an electrolyte in the secondary battery in g/Ah; A represents a mass ratio of a fluorine-containing additive to a cyclic carbonate additive in the electrolyte; σ represents an electric conductivity of the electrolyte in mS/cm; α represents a porosity of a positive electrode plate; η represents a viscosity of the electrolyte at 25°C in mPa·s; PD represents a compaction density of a positive electrode active material layer in g/cm<3>. The electrolyte retention coefficient of the battery, the positive electrode plate, and the electrolyte additives are all controlled, so as to satisfy specific requirements, thereby significantly improving the fast-charging performance and low-temperature discharging performance of the secondary battery.

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A battery cell (1), a method for assembling the battery cell (1), and a battery pack are provided. In the battery cell (1), a tab (22) in an electrode assembly (20) extends in a first direction (X) without bending. A connecting sheet (31) is provided on an end surface (2221) of a second end (222) of a tab (22) exposed from a main body (21), and the connecting sheet (31) is welded to the end surface (2221) of the second end (222) to form a welding mark (32) extending in a second direction (Y). The tab (22) only needs to be exposed from the main body (21) by a short distance to achieve connection with the connecting sheet (31), thereby increasing the capacity of the battery cell (1) and enhancing the energy density of the battery cell (1).

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A secondary battery and an electrical device are provided. In the present disclosure, by controlling a negative electrode plate of the secondary battery, a negative electrode active material and an electrolyte to satisfy Formula (I), the secondary battery can be ensured to have excellent cycling and storage stability: 0.35 ≤ m × C × P × D V 50 W ≤ 12.0 <img class="EMIRef" id="39018ee3-183f-47ff-9f66-9bf05f316ea8-ia01" />

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An embodiment of the present application provides a battery charging method, an electronic device, and an electric device. The charging method provided by the present application performs alternate charge and discharge cycles with high and low currents during the fast-charging-cycle process, which can eliminate polarization caused by high-current fast charging with only a slight increase in charging duration, improve interface lithium plating, prevent abnormal battery cell voltage plunging phenomena, and balance regional SOC differences at the interface caused by fast charging. Furthermore, low-current charging can reduce temperature rise differences within the battery cell, reduce regional overcharging and over-discharging phenomena, improve lithium plating, and also enhance the usable life of the battery, solving the problem that the existing charging method cannot improve lithium plating on the negative electrode of lithium batteries while ensuring fast charging performance.

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The present disclosure relates to a battery cell and a battery pack including the same. The battery cell includes a housing; a cell assembly, wherein the cell assembly comprises a jelly roll and a plurality of first tabs and a second tab, the plurality of first tabs and the second tab are electrically connected to the jelly roll, the plurality of first tabs are spaced apart, the plurality of first tabs and the second tab are spaced apart in a first direction X and have opposite polarities; a top cover; a first terminal post, electrically connected to the plurality of first tabs; a second terminal post, electrically connected to the second tab. In the present disclosure, by arranging the battery cells in the battery pack, not only the space utilization can be improved, but also the fast-charging performance can be enhanced.

Disclosed are a secondary battery and a method of preparing the same, and an electrical device. The composite polymer coating material formed in the disclosure can achieve high bonding strength and high heat resistance of a separator through a single coating process, and has excellent hydrophilicity, so that the separator has better wettability and liquid retention capacity, which is conducive to improving ionic conductivity; in addition, the separator of the disclosure introduces fewer components, resulting in a reduced density of the composite polymer coating material and a smaller thickness of the coating.

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Provided herein is a lithium-ion battery and an electrical apparatus. A cathode active material of the lithium-ion battery in this disclosure includes lithium nickel cobalt manganese oxide and manganese iron lithium oxide, and a cathode of the battery satisfies a formula as follows: 0.5 ≤ R = 10 × ω × PD / ln(H) ≤ 4; where ω is a weight percentage of manganese iron lithium oxide in the cathode active material; PD is a compaction density of the cathode in g/cm³; H is an enthalpy value of the cathode in J/g.

Provided herein is a lithium-ion secondary battery and an electrical apparatus. In this disclosure, parameters related to an anode and an electrolyte of the lithium-ion secondary battery are reasonably designed, such that the lithium-ion secondary battery satisfies a relationship: 6.7 ≤ CB × PD / (η × A) ≤ 160, where CB represents a capacity excess coefficient of the lithium-ion secondary battery; A represents a mass percentage of the DTD in the electrolyte; PD represents a compaction density of the anode active material layer; η represents a viscosity of the electrolyte.