CATL Patente

A battery cell (10), a battery (100), and an electrical device. The battery cell (10) comprises a housing (1) and an electrode assembly (2). The housing (1) is cylindrical, the housing (1) accommodates the electrode assembly (2), and the housing (1) comprises a side wall (13) disposed surrounding the electrode assembly (2). The side wall (13) is provided with a groove group (131), the groove group (131) comprising multiple grooves arranged at intervals along a circumferential direction of the side wall (13), the multiple grooves comprising at least one first groove (132), and the side wall (13) being configured to be capable of cracking along at least a portion of the first groove (132) when the battery cell (10) releases pressure. The multiple grooves further comprise at least one second groove (133), the minimum residual thickness of the second groove (133) being greater than the minimum residual thickness of the first groove (132). Disposing the second groove (133) on the side wall (13) enables the side wall (13) to release stress at the position where the second groove (133) is disposed, thereby alleviating deformation of the side wall (13) caused by stress release of the side wall at the first groove (132), effectively increasing the roundness of the side wall (13), and increasing assembly quality of the battery cell (10), thereby prolonging the service life of the battery cell (10).

The present application relates to a composite thermal insulation pad, a battery, and an electric device. The composite thermal insulation pad comprises: a thermal insulation pad body; and a thermally conductive layer, which is arranged in the thermal insulation pad body. According to the composite thermal insulation pad, on one hand, the thermal insulation pad body can achieve the effect of thermal insulation; and on the other hand, the thermally conductive layer is arranged in the thermal insulation pad body, and if heat is conducted to the interior of the thermal insulation pad body to reach the thermally conductive layer, the thermally conductive layer can rapidly and uniformly diffuse the heat throughout the surrounding area, thereby achieving the effect of rapid heat dissipation. The composite thermal insulation pad is applied to the battery; the thermal insulation pad body mainly achieves the effect of thermal insulation under the normal working state of the battery; and when abnormal battery heating occurs, the thermally conductive layer can achieve rapid heat diffusion, thereby achieving the effect of retarding thermal runaway of the battery.

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The present application relates to the technical field of batteries, and provides a battery and an electric device. The battery comprises a case, a plurality of battery cell groups, thermal management components, and a protective element. The case is provided with a first wall in a first direction. The plurality of battery cell groups are accommodated in the case, the plurality of battery cell groups are arranged in a second direction, each cell group comprises at least one battery cell, and the second direction intersects with the first direction. In the second direction, each thermal management component is arranged between two adjacent battery cell groups, and the thermal management component is configured to exchange heat with the battery cells. The protective element is arranged between the first wall and the plurality of battery cell groups in the first direction, and the protective element is configured to transfer external force borne by the first wall to the battery cell groups so as to protect the thermal management components, thereby reducing the impact of collision force generated on the first wall on the thermal management components, reducing the risk of leakage and other failures of the thermal management components during use, improving the use reliability of the battery, and prolonging the service life of the battery.

An insulation detection method and apparatus for an energy storage system, a device, a medium, and a program product. The method comprises: acquiring an insulation resistance value of each battery cluster in an energy storage system; on the basis of the insulation resistance value of each battery cluster, determining insulation information of each battery cluster, the insulation information comprising whether an insulation fault is present, as well as a fault level under when an insulation fault is present; and, on the basis of the insulation information of each battery cluster, determining insulation information of the energy storage system. The described detection method and apparatus, the device, the medium, and the program product can improve the safety and stability of an energy storage system.

A battery and an electric device. The battery (2) comprises a case (202), a battery cell group (7) and a blocking structure (8), wherein the case (202) is provided with an accommodating cavity; and the battery cell group (7) is located in the accommodating cavity, and the battery cell group (7) comprises at least one column of a plurality of battery cells (3) arranged in a first direction, each battery cell (3) comprising a first wall (31) and a second wall (32) connected to and intersecting with each other, the first wall (31)being provided with a pressure relief mechanism, and a gap (203) being provided between the second wall (32) and the case (202). When thermal runaway occurs in the battery, high-temperature ejecta is ejected from the pressure relief mechanism of the first wall (31); and at least part of the blocking structure (8) is located within the gap (203) to prevent at least some of emissions discharged via the pressure relief mechanism from entering the gap (203).

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Disclosed in the present application are a battery cell winding mandrel device and a battery cell winding apparatus. The battery cell winding mandrel device comprises: a mounting base (10); an assembly housing (20), which is provided with a first end (21) and a second end (22), the first end (21) being fixedly mounted on the mounting base (10), and the second end (22) being a free end; at least one transmission assembly (30) mounted on the assembly housing (20), each transmission assembly (30) comprising a plurality of transmission components (31), the plurality of transmission components (31) being arranged around the axis of the assembly housing (20); and a plurality of suction shells (40) connected to the corresponding transmission components (31) on a one-to-one basis, the plurality of suction shells (40) being combined to form a cylindrical structure, and the transmission components (31) driving the suction shells (40) to move in the direction perpendicular to the axis of the assembly housing (20), thus expanding or reducing the outer diameter of the cylindrical structure. The application of the present technical solution aims to solve the problem of the difficulty in unloading a bare battery cell from a battery cell winding mandrel device.

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A battery cell (20), a battery (100), and an electrical apparatus. The battery cell (20) comprises: a housing (23), the housing (23) comprising a first wall (21); an electrode assembly (22), provided with a tab; an electrode terminal (25), disposed on the first wall (21), the electrode terminal (25) being used to connect to a busbar (30) of the battery (100); and an adapter (24), the adapter (24) being used to connect the tab and the electrode terminal (25). The electrode terminal (25) is formed having a first weld pool area (40) and a second weld pool area (41), the first weld pool area (40) being used to connect to the busbar (30), the second weld pool area (41) being connected to the adapter (24). The first weld pool area (40) and the second weld pool area (41) are staggered along a direction perpendicular to the thickness direction of the first wall (21).

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