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Gradient utilization, screening and matching method for power cells

A battery cell cascade and power technology, which is applied in the field of power cell cascade utilization screening and grouping, can solve the problems of increasing redesign cost, battery cell group not reaching the echelon utilization, untrue reflection of battery cells, etc., and achieves convenient operation , high safety, easy to judge the effect

Inactive Publication Date: 2017-12-12
SHANGHAI INT AUTOMOBILE CITY GRP CO LTD
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Problems solved by technology

However, these parameters do not truly reflect the differences between the batteries, especially the retired batteries, which will eventually lead to the failure of the battery pack to achieve the effect of cascade utilization after assembly and use, and instead increase the cost of redesign

Method used

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  • Gradient utilization, screening and matching method for power cells
  • Gradient utilization, screening and matching method for power cells
  • Gradient utilization, screening and matching method for power cells

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Embodiment Construction

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0031] Such as figure 1 As shown, the power cell ladder of the present invention uses the method of screening and grouping, and the specific implementation is as follows:

[0032] Step 1. Measure and record the static voltage V1 of the disassembled cells in the decommissioned system;

[0033] Step 2. After standing still for 5 days, measure and record the static voltage V2 of the battery cells dismantled from the decommissioning system;

[0034] Step 3. ...

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Abstract

The invention relates to a gradient utilization, screening and matching method for power cells. The method comprises the following steps: (1) the static-state voltage measurement is performed on disassembled cells to record as V1; (2) the static-state voltage measurement is performed on the disassembled cells to record as V2; (3) the difference between V1 and V2 is less than a first set threshold; (4) the constant-current discharge is performed on the safe-screened cells according to a set rate to reach a lower limit voltage value for laying aside; the constant-current charge is performed according to a set rate to reach an upper limit voltage value for laying aside; the constant-current discharge is performed according to a set rate to reach a set charge state; and the discharge capacity Q and the static-state voltage V3 are recorded; (5) the rebound voltage measurement is performed on the cells according to the set charge state to record as V4; (6) the difference of V4 and V3 is more than a second set threshold; and (7) the cells are matched; firstly, the grading is performed according to the V4-V3 rebound voltage difference of the cells; and the final grading is performed according to the discharge capacity Q. compared with the prior art, the method has such advantages as high safety and convenience in operation.

Description

technical field [0001] The invention relates to a method for screening and grouping of power cells, in particular to a method for screening and grouping of power cells for cascade utilization. Background technique [0002] With the gradual industrialization of electric vehicles, a large number of automotive batteries will be eliminated in the next few years. Although power cells cannot continue to be used in electric vehicles, they can also be used in other occasions that have lower requirements for cells, such as energy storage systems. We prolong the service life of batteries and reduce the life cycle cost of power batteries through the method of cascade utilization, which is of great significance to promote the healthy development of the electric vehicle industry. [0003] At present, the cascade utilization screening and grouping of power cells are still carried out in the mode of fresh cells, and the main sorting method is the resistance-capacitance sorting method. Be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B07C5/342B07C5/38
CPCB07C5/342B07C5/38
Inventor 王伟平金勇喻杰曹光宇
Owner SHANGHAI INT AUTOMOBILE CITY GRP CO LTD
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