Simulation analysis method for researching tab structure of spirally wound lithium ion power battery

Abstract

The invention discloses a simulation analysis method for researching a tab structure of a spirally wound lithium ion power battery. The method comprises the following steps of preparing a battery sample, and testing charge / discharge performance data of first circle; building a battery finite element model, setting a physical field, a solving domain and material attribute information, and performing grid division; adding an initial value, a boundary condition and subsequent grid division of the model; putting the battery into an incubator with a temperature of 25 DEG C for performing related charge / discharge testing, thereby correcting key parameters of the model and realizing simulation result verification of the model; and based on the accurately verified model, performing optimization design research on the tab structure of the battery. The method has the beneficial effects that a real structure is replaced with multiple line segments, so that the subsequently divided grid quantity is reduced, and the solving quantity of the model is reduced. In addition, the invention provides a position confirmation method for a tab in spirally wound geometry.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a simulation analysis method for studying the tab structure of a wound-type lithium-ion power battery. Background technique [0002] Lithium-ion batteries are widely used in the fields of energy storage and power due to their advantages such as high operating voltage, long cycle life, high energy density, wide operating temperature range, and no memory. Compared with energy storage devices, automotive power sources have higher requirements on the power performance and thermal safety of lithium-ion batteries. Therefore, it is necessary to reduce the internal resistance of the battery as much as possible to reduce the internal resistance of the battery during charging and discharging. One of the effective ways to achieve this goal is to optimize the tab structure of the battery. [0003] For the 18650 type lithium-ion battery, the length of the pole piece along the w...

AI Technical Summary

Problems solved by technology

However, limited by the complexity of the internal structure of the 18650-type lithium-ion battery, the current simulation research on lithium-ion batteries mostly uses simplified geometric models such as 1D quasi-two-dimensional, 2D axisymmetric, and 3D non-layered, and it is impossible to carry out the tab structure. design research; if a real 3D battery layered model including tabs is established, the computational complexity of subsequent meshing and model solving brought about by this geometric complexity is incalculable

Images