Low-temperature performance evaluation method for lithium ion battery

A lithium-ion battery, low-temperature performance technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of poor electrical conductivity, limited dynamic characteristics, etc., and achieve the effect of accurate measurement results

Inactive Publication Date: 2012-06-27
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, compared with other positive electrode active materials, LiFePO 4 The disadvantage of the inherent poor electrical conductivity of the material greatly limits its dynamic properties at low temperatures

Method used

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  • Low-temperature performance evaluation method for lithium ion battery
  • Low-temperature performance evaluation method for lithium ion battery

Examples

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Comparison scheme
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Embodiment 1

[0014] Example 1: The new lithium-ion battery evaluation method of the present invention is applied to a certain type of 10Ah single battery, respectively measuring the internal resistance difference of 30 single batteries before and after formation, and the measurement results are shown in the attached figure 1 .

[0015] Determine the standard value for the selection of lithium-ion batteries or battery packs, and take the densely distributed area as the upper limit of the standard value (for an example, see the attached figure 1 ,30 groups of 3.2V / 10Ah batteries have internal resistance difference before and after formation, the maximum internal resistance difference is 3.3mΩ, most of them are between 1.9-2.8mΩ, so 2.8mΩ is selected as the upper limit of the standard value) Specifically: Measure the internal resistance of 30 groups of batteries before and after formation, take the difference, and select three batteries with internal resistance differences of 3.3, 2.6, and ...

Embodiment 2

[0016] Example 2: The low temperature performance evaluation method of lithium ion battery comprises the following steps:

[0017] (1) Determination of internal resistance sorting standard values ​​before and after formation of lithium-ion batteries: According to each type of lithium-ion batteries stored in an environment below the low temperature dew point -40°C for 24 hours, then draw the measurement distribution results of internal resistance, and take the distribution The dense area is the upper limit of the standard value;

[0018] (2) Test the internal resistance of the lithium-ion battery to be tested before and after formation, and then compare the measured internal resistance difference of the lithium-ion battery to be tested before and after formation with the determined internal resistance sorting standard value of the lithium-ion battery before and after formation Compared;

[0019] (3) If the internal resistance of the lithium-ion battery is less than the stand...

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Abstract

The invention discloses a low-temperature performance evaluation method for a lithium ion battery. The method is executed according to the following steps of: firstly, measuring a standard value upper limit according to various models of lithium ion batteries; then, measuring the internal resistance of a single to-be-measured lithium ion battery before and after formation; comparing the calculated internal resistance data with the determined lithium ion battery sorting standard value, if the internal resistance is less than the standard value, the battery is qualified, otherwise, the battery is unqualified; wherein the lithium ion battery sorting standard value is obtained by taking a middle distribution dense area of the measurement distribution result of the differences between the internal resistances before and after formation of various models of batteries as the standard value upper limit. The method of the invention is quick, simple and easy to execute, and provides accurate measurement result, so that the method is a measuring method having no influence on battery evaluation and battery sorting.

Description

technical field [0001] The invention relates to the field of performance evaluation of a lithium-ion battery cell, and more specifically relates to a method for evaluating the low-temperature performance of a lithium-ion battery cell. Background technique [0002] At present, lithium batteries are widely used due to their advantages of high voltage, large specific energy, long cycle life, and environmental protection. Lithium cobalt oxide (LiCoO 2 ), lithium manganese oxide (LiMn 2 o 4 ), lithium nickel oxide (LiNiO 2 ) and lithium iron phosphate (LiFePO 4 ). Since LiFePO 4 It has the advantages of abundant raw material sources, low price, excellent high-temperature cycle performance and safety performance, and LiFePO 4 Lithium-ion batteries (LiFePO 4 battery) is the most promising. However, compared with other positive electrode active materials, LiFePO 4 The material's inherent poor electrical conductivity greatly limits its dynamic properties at low temperatures...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
Inventor 孙红梅周威杨续来张佳瑢陈萍
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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