Abstract: A protective sleeve, a battery thermal management system, and a battery are provided. The protective sleeve is configured to sleeve a pipeline and includes a sleeve body, where the sleeve body includes a first bundling section, a first diameter-variable section, a protective section, a second diameter-variable section, and a second bundling section arranged in sequence. Diameters of the first bundling section and the second bundling section are smaller than diameter of the protective section, and the first bundling section and the second bundling section are capable of elastically clamping the pipeline, so as to fix the protective sleeve to the pipeline. This can improve the convenience of installing and removing the protective sleeve on the pipeline.

Abstract: A water cooling plate assembly includes: a harmonica reed plate, a first current collector, and a second current collector. The first current collector is disposed at a first end of the harmonica reed plate in the length direction. A first current collecting space communicating with a port at one end of the plurality of cooling channels is formed in the first current collector. A first liquid inlet and a first liquid outlet through which the cooling liquid flows into and out of the first collecting space respectively are formed on the first current collector on two sides in a thickness direction of the harmonica reed plate respectively.

Abstract: A battery includes a battery cell and a thermal management component. The thermal management component is configured to exchange heat with the battery cell. The thermal management component is provided with an avoidance structure, and the avoidance structure is configured to provide a space for expansion of the battery cell.