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Method for reusing decommissioned lithium ion power battery

A power battery and lithium-ion technology, which is applied in the field of reuse of retired lithium-ion power batteries, can solve the problems of differences in polarization degree, difficulty in selecting self-discharge batteries, large polarization differences, etc., and achieve the effect of improving consistency.

Inactive Publication Date: 2015-09-23
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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Problems solved by technology

[0003] However, these decommissioned power batteries basically have a large polarization phenomenon, and the decommissioned batteries under different use environments have large differences in the degree of polarization.
This leads to the fact that when the decommissioned power batteries are reused, the polarization voltage drop and the self-discharge voltage drop cannot be distinguished according to the general grouping process, and the selection of self-discharged batteries is difficult. The large polarization difference leads to the consistency of the batteries after grouping. poor

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  • Method for reusing decommissioned lithium ion power battery

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Embodiment Construction

[0019] Such as figure 1 As shown, take the reuse of 10 sets of decommissioned battery packs after use as an example. The specific steps are as follows: (1) Disassemble 10 sets of 168 parallel electric bus decommissioned battery packs into standard modules, a total of 1680 sets of standard modules; (2) Check the appearance, voltage, internal resistance, and capacity of the standard modules, and eliminate unqualified modules. A total of 10 groups of unqualified modules were eliminated; (3) Charge the qualified modules to 100% SOC, and after standing for 12 hours at room temperature, test the module polarization voltage U1; (4) Divide the modules into 5 gears according to U1, U1-1, U1-2, ... U1-5, U1-1: ≥3.35V, 167 pieces, U1-2: >3.338, ≤3.35V, 418 pieces, U1-3: >3.330, ≤3.338, 751 pcs, U1-4: >3.325, ≤3.330, 251 pcs, U1-5: <3.325V, 83 pcs; (5) After the module continues to stand at room temperature for 10 days, test the module voltage U2, and eliminate the module with large self...

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Abstract

The invention discloses a method for reusing a decommissioned lithium ion power battery. The method comprises a first step of disassembling a decommissioned battery pack into standard modules; a second step of checking the appearance, voltage, internal resistance and capacity of the standard modules, and removing substandard modules; a third step of standing the standard modules for T1 time, and then testing a polarization voltage U1 of the modules; a fourth step of according to the U1, classifying the modules into N stages, namely, U1-1, U1-2, and the like, and U1-N; a fifth step of standing the modules for T2 time, then testing a voltage U2 of the modules, and removing modules of large self discharge; and a sixth step of grouping the modules of each U1 voltage stage according to capacity so as to be reused. Due to stage classification of polarization voltage, polarization voltage drop and self discharge voltage drop are distinguished effectively, the screening efficiency of self discharge batteries is improved, and the grouping consistency of reused battery modules is improved.

Description

technical field [0001] The invention belongs to the application field of lithium ion batteries, in particular to a method for reusing decommissioned lithium ion power batteries. Background technique [0002] As more and more electric vehicles are put on the market, power batteries, the core components of electric vehicles, will be decommissioned from electric vehicles in large quantities at the end of their service life. These decommissioned power batteries have advanced manufacturing technology, and even after retirement To maintain high safety and electrical performance, it is necessary to maximize the resource utilization of waste power batteries by adopting a cascade utilization method. [0003] However, these decommissioned power batteries basically have a large polarization phenomenon, and the decommissioned batteries under different usage environments have large differences in the degree of polarization. This leads to the fact that when the decommissioned power batte...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54
CPCY02W30/84H01M10/54
Inventor 刘爱菊张敏贺狄龙
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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