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A method for consistency screening of lithium iron phosphate batteries

A lithium iron phosphate battery, consistent technology, applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve the problems of consistency and inability to guarantee the dynamic characteristics of the battery, so as to reduce the abnormal voltage difference, realize effective grouping, and ensure accurate Effect

Active Publication Date: 2020-03-20
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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AI Technical Summary

Problems solved by technology

However, the current screening of batteries mainly considers multiple matching parameters, which can effectively control the differences between battery static parameters, but cannot guarantee the consistency of battery dynamic characteristics

Method used

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  • A method for consistency screening of lithium iron phosphate batteries

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Embodiment Construction

[0020] refer to figure 1 In the following, a plurality of lithium iron phosphate batteries are selected to describe a method for consistency screening of lithium iron phosphate batteries proposed by the present invention, which specifically includes the following steps.

[0021] S1. Charge the battery with the first predetermined current I 1 After constant current discharge to the discharge cut-off voltage, then charge to the charge cut-off voltage with constant current and constant voltage, and record the charging capacity Q 充 , charging energy E 充 , charging median voltage V 充 . Specifically in this step, the charging cut-off voltage is 3.65V.

[0022] S2, and then with the first predetermined current I 1 Discharge each cell to the cutoff voltage V 1 , record the discharge capacity Q 放 , discharge energy E 放 , discharge median voltage V 放 . V 1 = 2.5V.

[0023] In this way, through the above two steps, the battery is charged with the first predetermined current I...

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Abstract

The invention discloses a lithium iron phosphate battery uniformity screening method. Abnormal batteries are screened through the battery charge-discharge energy efficiency and the voltage differencevalue, primary grading is carried out on residual batteries to be graded according to the battery capacities, grade refining is carried out according to the direct current internal resistance value inan SOC state, the battery dynamic state uniformity is advantageously guaranteed, and the precision of grading results is guaranteed. After the batteries are graded through the method, the batteries at the same grade are matched into a group, effective group matching of the batteries can be achieved, and the voltage difference abnormity caused by nonuniformity of the batteries is reduced.

Description

technical field [0001] The invention relates to the field of battery application technology, in particular to a method for consistency screening of lithium iron phosphate batteries. Background technique [0002] In the operation of electric vehicles, it is necessary to connect the single batteries in series and parallel to form a battery pack to meet the power demand during the operation of the vehicle. Due to the large number of single cells in the battery pack, its unstable consistency will seriously affect the capacity, energy, pressure difference, cruising range, and service life of the battery pack, which in turn will affect the user experience during use. Due to the influence of various factors in the manufacturing process of the battery, there are certain differences in the single battery itself. This difference is usually manifested as the difference in characteristics such as capacity, internal resistance, self-discharge rate, voltage platform, charge-discharge curv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B07C5/344G01R31/388G01R31/392G01R31/389
CPCB07C5/344G01R31/36
Inventor 杨思文厉运杰孙言飞
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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