Battery sequence, battery pack and electric vehicle

Abstract

The invention provides a battery sequence which comprises a plurality of batteries arranged in sequence, each battery comprises a shell and a pole core, and the pole core comprises a pole piece with a dressing layer; the structure of the battery sequence meets the following formula I: (1-JRw) + (SRw-1) = 10%-15%; JRw is an expansion space of an internal pole core of the battery in a first direction, SRw is an expansion space of the external part of the battery in the first direction, and the first direction is the thickness direction of the battery; JRw = Pw / (Cellw-Kw-Cw), Pw is the length of ta dressing layer at any moment in the first direction, Cellw is the length of the battery when the battery is not used in the first direction, Kw is the thickness of the shell in the first direction, and Cw is the incompressible length of the pole core in the first direction; and SRw = (Mw-MNw) / (Celln * Cellw), Mw is the length of the battery sequence in the first direction, MNw is the incompressible length of the battery sequence in the first direction, and Celln is the number of the batteries. The invention also provides a battery pack and an electric vehicle. According to the invention, the structure and / or material selection of the battery sequence meet the formula I, the expansion gap can be controlled, and the pole piece interface and cell performance can be improved.

Description

technical field [0001] The invention relates to the battery field, in particular to a battery sequence, a battery pack and an electric vehicle. Background technique [0002] With the continuous popularization of new energy vehicles, the requirements for the use of power batteries in new energy vehicles are becoming higher and higher. Most of the existing batteries use square aluminum shells in the shell. For square aluminum shell batteries, a certain assembly gap is usually left between the pole core and the aluminum shell for the cycle performance of the battery, the convenience of assembling into the shell and not scratching the diaphragm. If the gap is too large, it will not only lead to insufficient use of space and waste of battery capacity, but also lead to movement of the pole core in the battery, and gas production during charging and discharging will cause poor interface state, and lithium ions cannot diffuse through the poor interface to produce lithium. Affect ba...

AI Technical Summary

Problems solved by technology

Most of the existing batteries use square aluminum shells in the shell. For square aluminum shell batteries, a certain assembly gap is usually left between the pole core and the aluminum shell for the cycle performance of the battery, the convenience of assembling into the shell and not scratching the diaphragm. If the gap is too large, it will not only lead to insufficient use of space and waste of battery capacity, but also lead to movement of the pole core in the battery, and gas production during charging and discharging will cause poor interface state, and lithium ions cannot diffuse through the poor interface to produce lithium. Affect battery safety and life

Images