Secondary storage battery simulation method

Abstract

The invention discloses a secondary storage battery simulation method. The method comprises the following steps: acquiring manufacturing difference distribution of a storage battery; selecting parameters; dividing into a plurality of micro simulation units, wherein each micro simulation unit comprises a winding pericardium, a winding surface, an electrochemical unit and a particle level; arrangingparallel micro simulation units; starting simulation, and inputting a working current, an initial electric quantity, a temperature and a cut-off condition; sequentially calculating the branch currentof each level; calculating the balance of the electrode concentration of the particle level and the balance of the electrolyte concentration; calculating the balance of the electrode concentration ofthe electrochemical unit level and the balance of the electrolyte concentration; calculating the electrochemical reaction of the particle level and returning the average potential and the calorific value to the electrochemical unit level; calculating the hierarchical heat balance of the electrochemical unit and returning the temperature variation; judging whether a cut-off condition is met or not, if yes, ending the simulation, and if not, returning to recalculate until the cut-off condition is met, and ending the simulation. The simulation method provided by the invention is close to the electrochemical behavior of the secondary storage battery with actual high capacity or large geometric dimension.

Description

technical field [0001] The invention relates to the field of battery simulation, in particular to a secondary battery simulation method. Background technique [0002] The amount of electricity released by the battery under specified conditions or the length of the discharge time is called the battery capacity. At present, due to market demand, high-capacity secondary batteries with large geometric dimensions have gradually become the mainstream. Compared with small-size high-capacity batteries with large geometric dimensions, manufacturing differences and temperature field distribution will have a particularly significant impact on the battery, making the electrochemical simulation behavior of the secondary battery gradually deviate from the experimental results, and the existing simulation technology gradually It is difficult to achieve a high-precision simulation level. For example, the traditional pseudo-two-dimensional electrochemical model (P2D model, Pseudo 2 Dimensi...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a secondary battery simulation method, which can match the simulation results with the experiment by considering the influence of manufacturing differences and geometric structures, so as to solve the problems in the prior art due to the influence of manufacturing deviation and temperature field. The problem that the electrochemical simulation behavior of the secondary battery gradually deviates from the experimental results; the secondary battery simulation method of the present invention is close to the electrochemical behavior of the actual battery

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