Battery pack and electric vehicle

Abstract

The invention provides a battery pack and an electric vehicle. The battery pack comprises a battery sequence which comprises a plurality of single batteries. The thickness of each single battery extends along a first direction, and the plurality of single batteries are sequentially arranged along the first direction to form the battery sequence. At least one single battery comprises a metal casingbody and a pole core packaged in the metal casing body. The air pressure in the metal casing body is lower than the air pressure outside the metal casing body. A gap is formed between at least two adjacent single batteries, and the proportion range of the gap to the thickness of the single batteries is 0.001 to 0.15. The battery pack provided by the invention is relatively high in energy density,and the safety performance is greatly improved.

Description

technical field [0001] The invention belongs to the field of batteries, in particular to a battery pack and an electric vehicle. Background technique [0002] Existing battery packs used in electric vehicles usually include multiple single cells to increase battery capacity, and the multiple single cells are installed in the battery pack casing. [0003] In the existing method, in order to increase the capacity of the single battery, multiple pole cores are connected in series in the shell of the single battery. Under the condition of vibration and bumps, the multiple pole cores are easy to move in the shell, and the pole cores and the pole cores are connected in series. There will be relative displacement between the cores, which will cause damage to the pole core, for example, the current collector is damaged, the separator is wrinkled, the active material layer on the pole piece falls off, the stability of the battery is poor, and safety problems are prone to occur. At t...

AI Technical Summary

Problems solved by technology

[0003] In the existing method, in order to increase the capacity of the single battery, multiple pole cores are connected in series in the shell of the single battery. Under the condition of vibration and bumps, the multiple pole cores are easy to move in the shell, and the pole cores and the pole cores are connected in series. There will be relative displacement between the cores, which will cause damage to the pole core, for example, the current collector is damaged, the separator is wrinkled, the active material layer on the pole piece falls off, the stability of the battery is poor, and safety problems are prone to occur

At the same time, the single battery will expand, and there are also safety issues

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