CATL Patente

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The present application provides a battery cell, a battery and an electrical device, and relates to the technical field of batteries. The battery cell includes a shell and a pressure relief component; the shell includes a first wall portion; the pressure relief component is arranged on the first wall portion, a first weak portion of the pressure relief component defines at least one predetermined pressure relief region, and the pressure relief component is configured to be capable of rupturing along at least part of the first weak portion when the battery cell is subjected to pressure relief; in the width direction of the first wall portion, the size of the first wall portion is W, the first weak portion includes at least one first weak section, and the area of the cross section, perpendicular to an extension direction, of the first weak section is S<1>, 10mm≤W≤100mm, 0.006mm<2>≤S<1>≤0.15mm<2>. The risk of liquid leakage caused by the phenomenon that the pressure relief component is prematurely actuated or ruptures due to fatigue and the like after the battery cell is used for a long time can be reduced, the risks of bursting, explosion and the like of the shell of the battery cell caused by untimely pressure relief of the pressure relief component can be further reduced, and the operational reliability of the battery cell can be improved.

Embodiments of the present application provide a battery cell, a battery, and an electrical device. The battery cell includes a shell and a pressure relief component, where the pressure relief component is arranged on a first wall portion of the shell. The pressure relief component is provided with a first groove and a second groove, the first groove defines at least one predetermined pressure relief region, the pressure relief component is configured to be able to split along at least a part of the first groove when the battery cell releases pressure, the pressure relief component has a first surface and a second surface opposite to each other, the second groove is arranged in the first surface, and the second groove is configured to guide at least a part of the predetermined pressure relief region to flip. The second groove includes a first groove side surface and a second groove side surface arranged opposite to each other, the first groove side surface is closer to the predetermined pressure relief region than the second groove side surface, and an angle formed between the first groove side surface and the first surface is less than an angle formed between the second groove side surface and the first surface. The risk of the predetermined pressure relief region being opened prematurely due to poor surface flatness can be reduced, thereby prolonging the service life of the battery cell.

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A positive electrode film, a positive electrode film sheet, a solid-state battery, an electric apparatus, and applications thereof are provided. The positive electrode film includes a positive electrode active material layer, the positive electrode active material layer including a positive electrode active substance, a positive electrode solid electrolyte, and a conductive agent; where the positive electrode active substance includes an oxide positive electrode active substance, and the conductive agent includes a non-carbon conductive substance, the non-carbon conductive substance including at least one of elemental Se, elemental Te, and a Se/Te composite Se<x>Te<1-x>, where 0 < x < 1.

The present application provides a battery cell, a battery, and an electrical device. The battery cell includes a shell and a pressure relief component. The shell has a wall portion, and the pressure relief component is arranged on the wall portion. The pressure relief component includes a first weak portion and a second weak portion, the first weak portion defines a predetermined pressure relief region, the pressure relief component is configured to be capable of cracking along at least a part of the first weak portion during pressure relief of the battery cell, and the second weak portion is configured to guide at least a part of the predetermined pressure relief region to flip over to open the at least a part of the predetermined pressure relief region. The first weak portion includes a first weak section, and the first weak section and the second weak portion are arranged at an interval in a first direction. In the first direction, a minimum distance between the first weak section and the second weak portion is L, and a cross-sectional area of the second weak portion perpendicular to its extension direction is S, meeting: 3.3 mm≤L≤48 mm, and 0.008 mm<2>≤S≤0.45 mm<2>. In this way, the battery cell is capable of achieving rapid pressure relief, and has a high reliability.

Embodiments of the present application provide a battery cell, a battery, and an electrical device, which belong to the technical field of batteries. The battery cell includes a shell and a pressure relief component, where the shell includes a first wall portion, and the pressure relief component is disposed on the first wall portion. The pressure relief component is provided with a first groove, and the pressure relief component is configured to be capable of rupturing along at least part of the first groove when the battery cell undergoes pressure relief. The first groove includes at least one groove segment, a minimum width of a groove bottom surface of the groove segment being W, and along a thickness direction of the first wall portion, a minimum residual thickness of the groove segment being D<1>, satisfying: 0.005 mm<2> ≤ W×D<1> ≤ 0.12 mm<2>. It achieves a balance between the service lifetime requirements of the battery cell during normal use and the reliability requirements of the battery cell during thermal runaway.

The present application provides a battery cell, a battery, and an electrical apparatus, which belongs to the technical field of batteries. The battery cell includes a shell, the shell has a first wall and a second wall connected to each other, the first wall is provided with a first groove, the first wall is configured to be capable of rupturing along at least a part of the first groove during pressure relief of the battery cell, so as to release the internal pressure of the battery cell, the second wall is located on one side of the first wall in a first direction, the first groove includes a first groove segment, and the first groove segment and the second wall are arranged in the first direction. The first wall is also provided with a second groove, in the first direction, the second wall has a first outer surface facing away from an interior of the shell, and a projection of the second groove in a thickness direction of the first wall is located between the first outer surface and a projection of the first groove segment in the thickness direction of the first wall, so that the second groove can absorb the excess material from extrusion of the first groove segment during a forming process of the first groove segment, so as to alleviate a phenomenon that the battery cell partially arches or planeness of the first wall is reduced.

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