CATL Patente

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Disclosed are a battery cell, a battery, and a power consuming device. The battery cell includes an electrode assembly. The electrode assembly includes a positive electrode plate and a negative electrode plate. The positive electrode plate includes a first edge in a first direction, and the negative electrode plate includes a second edge corresponding to the first edge. The first edge extends beyond the second edge in the first direction. The technical solutions of the embodiments can improve the reliability of the battery.

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A sodium ion battery cell, a positive electrode sheet, a preparation method therefor and a related device. The sodium ion battery cell comprises a positive electrode sheet, the positive electrode sheet comprising a positive electrode active material and a solid electrolyte interphase film at least bonded to the surface of the positive electrode active material, and the solid electrolyte interphase film comprising one or multiple cations from Na⁺, Li⁺, K⁺ and Ca²⁺. The solid electrolyte interphase film bonded to the surface of the positive electrode active material comprises cations such as Na^-, Li⁺, K⁺ and Ca²⁺, and the cations can participate in electrochemical reactions of the sodium ion batteries to provide reversible capacity, so as to compensate for the capacity loss caused by the passivation of the positive electrode active material, thus improving the cycle performance of batteries. Additionally, the solid electrolyte interphase film comprising the cations helps to reduce the impedance of batteries, thus further improving the cycle performance of batteries.

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A sodium-ion battery cell, a secondary battery, and an electric device. The sodium-ion battery cell comprises an electrode assembly and a casing, wherein the casing is cylindrical; an accommodating cavity is provided inside the casing; and the electrode assembly is located inside the accommodating cavity. The electrode assembly comprises a negative electrode sheet, wherein the negative electrode sheet comprises a negative electrode current collector and a negative electrode active layer located on at least one surface of the negative electrode current collector, the density of the negative electrode current collector being less than or equal to 5.0 g/cm³. The group margin of the sodium-ion battery cell satisfies: 0.95 ≤ group margin < 1, where the group margin is the ratio of the diameter of the electrode assembly to the diameter of the accommodating cavity. The sodium-ion battery cell uses the negative electrode current collector having a relatively low density, combined with a relatively large group margin, and uses a cylindrical structure, such that the battery cell can achieve a relatively high gravimetric energy density, a relatively high volumetric energy density and relatively good cycling performance, thus being conducive to prompting the development of miniaturization and weight reduction of the battery cell.

A positive electrode sheet and a preparation method therefor, a battery, and an electric device. The positive electrode sheet comprises: a positive electrode active material layer, the positive electrode active material layer comprising a positive electrode active material; and a capacity compensation layer, the capacity compensation layer being provided on at least one side of the positive electrode active material layer, and the capacity compensation layer comprising a capacity compensation agent and an additive. Therefore, the probability that the additive reacts with residual alkali is increased, the content of residual alkali on the surface of the capacity compensation agent is reduced, the capacity compensation effect is improved, and the cycle capacity retention rate of the battery is improved.

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The present application relates to a battery equalization control method, an apparatus, a device, a storage medium and a program product. The method comprises: acquiring the current capacity and the current temperature of each battery branch in a battery system; according to the current capacity and the current temperature of each battery branch, determining a target temperature of each battery branch; and, according to the target temperature of each battery branch, performing thermal management on each battery branch so as to balance branch currents of the multiple battery branches. Using the present application can reduce the problem of ring current and increase the available capacity of battery systems.

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A battery cell and an electric device comprising same. The battery cell comprises an electrode assembly, which comprises a positive electrode sheet and a separator, wherein the positive electrode sheet comprises a positive electrode current collector and a positive electrode membrane layer arranged on at least one surface of the positive electrode current collector, the positive electrode membrane layer comprises a positive electrode active material, the positive electrode active material comprises a layered lithium-containing transition metal oxide, and the volume distribution particle size Dv50 of the positive electrode active material is smaller than or equal to 6.5 µm; and the separator comprises a porous substrate and a porous coating arranged on at least one surface of the porous substrate, and the porous coating comprises a fiber material and a granular filler. The electric device can make a battery have a high energy density, good low-temperature power performance and cycling performance.

A battery cell (20), a battery (100) and an electrical device. The battery cell (20) comprises a casing (21), a first electrode terminal (22), an electrode assembly (23), a first insulating member (24) and a second insulating member (25). The casing comprises a first wall (211), and the first electrode terminal (22) is insulated from and arranged on the first wall (211); the electrode assembly (23) is arranged in the casing (21), the electrode assembly (23) comprising a main body part (231) and a first tab (232); the main body part (231) is flat, and the main body part (231) is provided with a first end surface (2311) facing the first wall (211); the first tab (232) is arranged on the first end surface (2311), and the first tab (232) is electrically connected to the first electrode terminal (22); the first insulating member (24) and the second insulating member (25) are arranged in the casing (21), and in the thickness direction of the main body part (231), the first tab (232) is located between the first insulating member (24) and the second insulating member (25).

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