Composite substrate and its preparation method, battery and electric vehicle

Abstract

Embodiments of the present invention provide a composite substrate and a preparation method thereof, a battery and an electric vehicle, and relate to the field of batteries. The composite substrate has tab forming regions and thinning regions alternately arranged, and the composite substrate includes an insulating layer, a first metal layer, a second metal layer, a first adhesive layer, a second adhesive layer and a conductive adhesive layer. In the thinned area, the first adhesive layer and the second adhesive layer are respectively disposed on opposite sides of the insulating layer, the first adhesive layer is connected to the first metal layer, and the second adhesive layer is connected to the second metal layer . Both the first adhesive layer and the second adhesive layer extend from the thinned area to the lug forming area and are connected to the conductive adhesive layer. In the lug forming area, the first metal layer and the second metal layer are respectively disposed on opposite sides of the conductive adhesive layer, and the first metal layer is electrically connected to the second metal layer. The embodiment of the present invention can increase the weight energy density of the battery, is convenient for welding, has strong adhesion, and is beneficial to improving the cycle performance of the battery.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a composite base material and a preparation method thereof, a battery and an electric vehicle. Background technique [0002] The positive and negative electrodes of lithium-ion secondary batteries are made by coating electrode materials on the surface of metal current collectors (copper foil or aluminum foil). Metal current collectors are expensive and dense, and occupy a large proportion of the weight of the pole pieces, thus The weight energy density of the battery is reduced, which affects the cruising range of the electric vehicle. In general, lithium-ion secondary batteries only need a very thin layer of metal conductive layer to meet the conductivity requirements in the working process. Use ultra-thin metal current collectors. On the other hand, in the case of an internal short circuit in the battery, different current collectors have different effects on the temperature rise of ...

AI Technical Summary

Problems solved by technology

[0002] The positive and negative electrodes of lithium-ion secondary batteries are made by coating electrode materials on the surface of metal current collectors (copper foil or aluminum foil). Metal current collectors are expensive and dense, and occupy a large proportion of the weight of the pole pieces, thus Reduce the weight energy density of the battery, affecting the cruising range of electric vehicles

In general, lithium-ion secondary batteries only need a very thin layer of metal conductive layer to meet the conductivity requirements in the working process. Using ultra-thin metal current collectors

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