Amperex Technology Limited Patente

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An electrochemical apparatus (100) and an electric device are provided. The electrochemical apparatus (100) includes: a housing (1), a first feedthrough member (7), an electrode assembly (2), and a first tab (3). The housing (1) is provided with an accommodating cavity (14). The electrode assembly (2) is accommodated in the accommodating cavity (14). The housing (1) includes a first side plate (131). The first feedthrough member (7) runs through the first side plate (131), and the first feedthrough member (7) is insulated from the first side plate (131). The first tab (3) is connected to the electrode assembly (2). The electrochemical apparatus (100) further includes a first adapter (5), where the first adapter (5) is accommodated in the accommodating cavity (14). The first tab (3) is provided with a first bending groove (324). One end of the first adapter (5) is connected to a groove wall of the first bending groove (324), and another end of the first adapter (5) is electrically connected to the first feedthrough member (7). Along a thickness direction of the first side plate (131), a projection of the first tab (3) does not overlap with a projection of the first feedthrough member (7). The above manner is conducive to reducing a dimension of the electrochemical apparatus (100) in a width direction. When the dimension of the electrochemical apparatus (100) in the width direction remains unchanged, more space can be left for the electrode assembly (2), which is conducive to increasing the energy density of the electrochemical apparatus (100).

A secondary battery and an electronic apparatus are provided. The secondary battery includes a housing and an electrode assembly. The electrode assembly includes a negative electrode sheet and a positive electrode sheet. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer. Along a first direction, the number of layers of the positive electrode active material layer in the electrode assembly is N. The electrode assembly includes a first end and a second end opposite to each other along a second direction perpendicular to the first direction. At the first end, an edge of the positive electrode active material layer is a first edge, and an edge of the negative electrode active material layer is a second edge. A distance in the second direction between the first edge of each layer of the positive electrode active material layer and the second edge closest to the first edge along the first direction is D. Along the second direction, a dimension of the positive electrode active material layer is D₁, and a dimension of the negative electrode active material layer is D₂. Among the N layers of the positive electrode active material layer, n layers satisfy the following condition: D ≤ 0.38 (D₂ - D₁). The electrode assembly can improve the reliability and service life of the secondary battery.

An electrochemical apparatus is provided, including a positive electrode, a negative electrode, and an electrolyte. The positive electrode includes a positive electrode current collector and a positive electrode active layer disposed on at least one surface of the positive electrode current collector. The positive electrode active layer includes a central region and an edge region surrounding an outer periphery of the central region, the edge region includes a first positive electrode active material, and the central region includes a second positive electrode active material. A solid-phase diffusion coefficient of the first positive electrode active material is 10<-15> cm<2>/s to 10<-5> cm<2>/s, and a ratio of the solid-phase diffusion coefficient of the first positive electrode active material to a solid-phase diffusion coefficient of the second positive electrode active material is 1:3 to 1:1.05. The above electrochemical apparatus is conducive to reducing a difference in kinetic performance between the central region and the edge region, thereby enhancing overall capacity utilization of the electrochemical apparatus and improving overall performance of the electrochemical apparatus. This application further provides an electronic apparatus using the electrochemical apparatus.

This application provides an electrolyte, an electrochemical apparatus, and an electronic apparatus. The electrolyte includes at least two of an additive I, an additive II, or an additive III. The additive I is at least one additive selected from a group consisting of a compound represented by the following formula 1a, a compound represented by the following formula 1b, and lithium difluorophosphate; <img class="EMIRef" id="55205f61-b062-4132-b383-971b74297284-ia01" /> and <img class="EMIRef" id="55205f61-b062-4132-b383-971b74297284-ia02" /> The additive II is at least one additive selected from a group consisting of lithium fluorosulfonate, difluorosulfonimide, and bistrifluoromethane sulfonimide. The additive III is at least one additive selected from a group consisting of lithium difluorooxalate borate, lithium bisoxalate borate, and lithium tetrafluoroborate. The electrolyte provided in this application can improve the low-temperature performance and reduce the resistance and thickness swelling rate of electrochemical apparatuses.

An electrochemical device (100) and an electronic device are provided. The electrochemical device (100) includes an electrode assembly (10) and an electrolyte, where the electrode assembly (10) includes an electrode tab (20), and an electrode tab sealant (30) is provided on the electrode tab (20). In a direction perpendicular to an extension direction of the electrode tab (20), a width of the electrode tab sealant (30) exceeds a maximum width of the electrode tab (20) by A mm, where 1.8 ≤ A ≤ 2.6. The electrolyte includes a linear ester, where based on a mass of the electrolyte, a mass percentage of the linear ester is B%, with A/B meeting 0.0215 ≤ A/B ≤ 0.058. The inclusion of the linear ester in the electrolyte, along with controlling the values of A and A/B within the above ranges, can address the issue of high solubility of the electrode tab (20) sealant caused by high content of the linear ester, reduce the content of impurity in the electrolyte, facilitate the transport of ions in the electrolyte, and reduce side reactions in the electrolyte, thereby improving the cycling performance and rate performance of the electrochemical device (100).

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An electrochemical apparatus, an electrical device, and a preparation method of an electrochemical apparatus are provided. The electrochemical apparatus includes an electrode assembly. The electrode assembly includes an electrode plate assembly, a first tab, and a second tab. The electrode plate assembly includes a first electrode plate and a second electrode plate. The first electrode plate includes a first current collector and a first active material layer, a first region of a winding tail section of the first current collector is connected to the first tab, and the first current collector includes a first coated region and a first segment located at the winding tail section. The second electrode plate includes a second current collector and a second active material layer, a second region of a winding tail section of the second current collector is connected to the second tab, and the second current collector includes a second coated region and a second segment located at the winding tail section. A sum of equivalent magnetic field strengths of the first current collector F₁ and a sum of equivalent magnetic field strengths of the second current collector F₂ satisfy: |F₁-F₂|≤4×10^-5, which can better reduce an axial magnetic field at an end face of a wound structure, thereby further reducing interference of the electrochemical apparatus to the electrical device.

A negative electrode active material, a battery, and an electric device are disclosed, and relate to the battery field. A particle size D<v>50 of the negative electrode active material is a µm, a specific surface area is b m<2>/g, and 20 ≤ 2.5 × a + b ≤ 40. The battery includes a positive electrode plate, a negative electrode plate, and an electrolyte, where 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 including the above negative electrode active material. The negative electrode active material, the battery, and the electric device of embodiments of the present application can improve the low-temperature discharge capability of the battery and increase the low-temperature discharge capacity retention rate thereof.

This application provides a negative electrode active material, a secondary battery, and an electronic apparatus. A pressurized compacted density of a powder of the negative electrode active material is a g/cm³, a pressure-released compacted density is b g/cm³, and a pressure-release rebound rate is c, where c = (a - b) / a × 100%, and 1.5% ≤ c ≤ 20%; and a and c satisfy: c = k × (a - 1), where 0.08 ≤ k ≤ 0.20. By regulating the value of k within the above range and ensuring a and c satisfy the above relationship, the negative electrode active material can maintain high porosity under a high compacted density, facilitating the infiltration of an electrolyte into the negative electrode sheet, enhancing the diffusion rate of active ions, and improving the kinetic performance of the secondary battery. Additionally, the heat dissipation performance of the negative electrode sheet can be improved, the temperature rise of the secondary battery can be reduced, and the cycle performance of the secondary battery can be improved.

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