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Detection method for low-temperature performance uniformity of lithium ion batteries

A lithium-ion battery and detection method technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve problems such as large differences in electrical properties, and achieve excellent performance and ensure consistency.

Inactive Publication Date: 2014-12-24
CHINESE ACAD OF INSPECTION & QUARANTINE
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Problems solved by technology

[0007] The purpose of the present invention is to provide a detection method for the consistency of electrical properties of lithium-ion batteries, which can detect the consistency of electrical properties of lithium-ion batteries under low temperature conditions, and effectively solve the problem that each single battery performs well under normal temperature conditions. The electrical properties are consistent, but the electrical properties vary greatly under low temperature conditions

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Embodiment Construction

[0025] The method of the present invention will be described in more detail below in conjunction with specific experimental procedures.

[0026] Instruments: comprehensive battery tester (MACCOR 3400), high-precision battery test system ((Xinwei TC53), temperature and humidity control box (SPHH-101) and data collector (model FLUKE 2620) and multimeter (Uniled UT33B) .

[0027] Test object: domestic power lithium-ion single battery, rated voltage 3.7V, nominal capacity 10Ah; external dimensions (length × width × height): 133mm × 66mm × 18mm; the positive electrode active material of the battery is LiMn 2 o 4 , the negative electrode active material is graphite, and the main component of the electrolyte is LiPF 6 , EC (ethylene carbonate) and DMC (dimethyl carbonate), the diaphragm is celgard 2325.

[0028] The low-temperature performance consistency detection method of the lithium-ion battery has the following steps:

[0029] (1) At room temperature (20°C ± 2°C), 10 single ...

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Abstract

A detection method for the low-temperature performance uniformity of lithium ion batteries includes the steps that (1), a voltage reducing value method is adopted for selecting out monomer lithium ion batteries with large self discharge; (2), the monomer lithium ion batteries B1 are treated in a capacity grading mode, the monomer lithium ion batteries with the same capacity difference standard are selected out; (3), the monomer lithium ion batteries Bc1 are charged and discharged at low temperature and then graded again; (4), the multiple monomer lithium ion batteries Bc2 are selected and matched to form a battery pack. The detection method has the advantages that conventional screening detection of the uniformity of the voltage, the internal resistance, the capacity, the storage voltage drop and the like is carried out at the normal temperature, and besides the detection of the cycling life after the batteries are charged and discharged at the low temperature is added and used for evaluating the electrochemical characteristics of the batteries at the low temperature, so that the uniformity of the electrical performance of all the monomer batteries at the low temperature is ensured, the batteries are reasonably matched, and it is ensured that the battery pack has excellent performance when charged and discharged at the low temperature and the normal temperature.

Description

technical field [0001] This field relates to the field of detection of power batteries, in particular to a detection method for the consistency of low-temperature performance of lithium-ion batteries. Background technique [0002] The research and development of electric road vehicles (including electric vehicles, electric motorcycles, etc.) is considered to be one of the most realistic and effective ways to solve the world energy crisis and global environmental pollution. The battery used as an electric road vehicle is one of the key components restricting its development. [0003] Due to the characteristics of high specific energy, high specific power, long service life and wide working range, lithium-ion batteries have been successfully applied to electric road vehicles. Lithium-ion batteries for electric road vehicles usually need to combine multiple small-capacity, low-voltage single cells in parallel / series to form a high-capacity, high-voltage battery pack. However,...

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Application Information

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IPC IPC(8): G01R31/36
Inventor 王宏伟白虹付艳玲陶自强肖海清
Owner CHINESE ACAD OF INSPECTION & QUARANTINE
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