Retired power battery dismounting-free reuse screening method based on operation big data

Abstract

The invention discloses a retired power battery dismounting-free reuse screening method based on operation big data. According to the method, retired power battery boxes uncovered for inspection; the uncovered power battery boxes are screened according to appearance characteristics; battery boxes with damaged appearances are filtered out; the battery boxes are subjected to self discharging test; internal discharging battery modules are marked according to battery pack self discharging parameters of the battery boxes, and the battery boxes with internal short circuit are removed; activating treatment is performed; the battery pack capacity is tested for capacity grading; battery modules in battery packs are subjected to consistency evaluation; the grading is performed according to consistency evaluation parameters; the historical operation data is read; use record parameters of all the battery packs are counted, and a health state is evaluated; a grade threshold value is set according to an evaluation result; the power battery packs meeting the set threshold values are screened. The surplus performance of retired power batteries of an electric automobile can be fully realized.

Description

technical field [0001] The invention relates to a screening method for decommissioned power batteries without disassembly and reuse based on operational big data. Background technique [0002] Lithium-ion power battery is the source of power for electric vehicles. It has the characteristics of high energy, high power, high discharge rate, wide operating temperature range, and long service life. The power battery for electric vehicles is a power battery module composed of multiple single batteries, and then the power battery module is assembled in the battery box in a certain series-parallel manner. Generally speaking, the power supply of an electric vehicle is composed of several battery boxes in series, involving hundreds or even thousands of power battery cells with good electrical performance consistency. The power battery determines the performance of the electric vehicle. Generally, the capacity of the power battery is attenuated to 80% of the initial capacity. In orde...

AI Technical Summary

Problems solved by technology

[0004] However, power batteries decommissioned from electric vehicles have inconsistent health status and cannot be directly used for secondary use. Strict screening must be carried out to eliminate problematic batteries with poor consistency and unqualified health status. Only through reasonable Screening and secondary use can ensure its full value

[0005] China Electric Power Research Institute's patent application CN201110410608.8 "A Grading Method for Cascade Utilization of Power Batteries for Electric Vehicles" proposes a theoretical method for grading power batteries, which can guide the detection of physical and chemical properties of power batteries, but the actual The operation feasibility is relatively low, and it is not easy to realize. Even if the detection is realized, it is easy to cause damage to the battery itself

[0006] Invention patents such as 201410466151.6 "A Screening Method for Cascade Utilization of Waste Batteries" and 201310261893.0 "A Screening Method for Cascade Utilization of Waste Power Batteries" all propose to disassemble the power battery module, disassemble the single power battery, and then re- Sorting and matching groups, this method can be realized theoretically and technically, but the process of dismantling, screening, capacity division, matching, and reassembly is a lot of work, which increases the cost of use for the cascade utilization of power batteries

Excessive cost of use will greatly reduce the value of decommissioned battery cascade utilization

[0007] At this stage, there is still no clear definition and method for the screening of waste power batteries

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