CATL Patente

Embodiments of the present application provide a casing, a battery cell, a battery, and an electrical apparatus. An opening is formed in the casing; the casing comprises a first wall and at least one second wall that are opposite to the opening, and the first wall and the second wall intersect with each other; the first wall and the second wall are connected by a first fillet, and the inner diameter r1 of the first fillet and the minimum thickness T2 of the second wall with the minimum thickness among the at least one second wall satisfy: 2.0 ≤ r1/T2 ≤ 30; the yield strength of the casing at the temperature of 25 °C is Re, wherein Re satisfies: 140 MPa ≤ Re ≤ 1000 MPa. According to the casing, the battery cell, the battery, and the electrical apparatus in the embodiments of the present application, the processing difficulty of the casing and the spatial capacity and strength of the battery cell can be balanced.

Disclosed in embodiments of the present application are a battery cell, a battery, and an electric device. The battery cell has a capacity of C and comprises a casing, and at least a partial region of the casing has a tensile strength of Rm at a temperature of 25 °C, wherein Rm and C satisfy: 250 MPa ≤ Rm ≤ 2000 MPa and 25 Ah ≤ C ≤ 550 Ah. According to the battery cell, the battery, and the electric device in the embodiments of the present application, the energy density and reliability of the battery can be improved.

Disclosed in the embodiments of the present application are a battery cell, a battery and an electric device. The battery cell comprises: an electrode assembly, wherein the electrode assembly comprises a positive electrode sheet, the positive electrode sheet comprises a positive electrode active material capable of realizing reversible de-intercalation and intercalation of metal ions, and the positive electrode active material comprises a compound containing nickel; and a case, which is used for accommodating the electrode assembly, wherein the melting point of at least some regions of the case is p, and p satisfies: 1200 °C ≤ p ≤ 2000 °C. According to the battery cell, the battery and the electric device in the embodiments of the present application, the reliability of the battery cell can be improved.

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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.

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.

The present application provides a case (10), a battery (100), and an electric device. A bottom plate (101) of the case (10) comprises a composite plate (1011) and a heat exchange plate (1012); the composite plate (1011) comprises a first material portion (10111) formed of a first material and a second material portion (10112) formed of a second material; a first welding surface (1011a) is formed on a part of the surface of the composite plate (1011); the first welding surface (1011a) is formed of the first material portion (10111); a second welding surface (1012a) is formed on a part of the surface of the heat exchange plate (1012); the heat exchange plate (1012) at the second welding surface (1012a) is formed of a third material; the third material and the first material are the same material; and the first welding surface (1011a) is welded to the second welding surface (1012a). According to the case (10) provided in the embodiments of the present application, an aluminum plate is replaced with the composite plate (1011), such that the problem of the quality of the case (10) being affected due to the heat exchange plate (1012) being difficult to weld can be effectively mitigated.

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.

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.

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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