Method for sorting consistency of lithium titanate single batteries

A single battery and lithium titanate technology, which is applied in sorting and other directions, can solve the problems of not considering the difference in DCR value, not considering the influence of polarization impedance and high current charging and discharging, and unfavorable industrialization promotion, so as to facilitate the industrialization The effects of popularization and application, short test time and simple operation

Inactive Publication Date: 2018-01-19
天津普兰能源科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Chinese patent application number 201610016946.6 uses different standing temperatures and times to investigate the self-discharge rates of different single batteries, but does not consider the effects of polarization impedance and high-current charging and discharging.
The Chinese patent with the application number 201010241411.1 uses the DCR value of the battery at -50-0°C as a method to determine the consistency of the battery. This scheme is reasonable, but it does not take into account the different DCR values ​​of different battery systems, and The harsh low temperature environment is not conducive to the industrialization of this scheme
[0005] The above single battery consistency screening scheme is still one-sided for ordinary lithium-ion battery systems. When it is directly used in lithium titanate battery systems, its disadvantages will be more prominent due to the particularity of the charging and discharging platform of lithium titanate battery systems.

Method used

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  • Method for sorting consistency of lithium titanate single batteries
  • Method for sorting consistency of lithium titanate single batteries
  • Method for sorting consistency of lithium titanate single batteries

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0053] Take a ternary / lithium titanate single battery with a nominal capacity of 25Ah, charge it to 2.7V with a 1C constant current, charge it to 0.05C at a 2.7V constant voltage, let it stand for 10 minutes, discharge it to 1.5V with a 1C constant current, and let it stand still 10min. The above charging and discharging cycle is carried out 3 times to obtain the actual discharge capacity of the battery, and finally use 1C constant current charging for 30 minutes. Among the batteries with qualified discharge capacity, single batteries with capacity difference within 0.5Ah, AC internal resistance difference within 0.02mΩ, and open circuit voltage difference within 0.02V were screened out. Put the sorted single cells in a high-temperature environment of 45°C for 10 days, then take them out and let them stand in a normal temperature environment for 12 hours, and screen out the cells with AC internal resistance difference within 0.02mΩ and open circuit voltage within 0.02V Batter...

Embodiment 2

[0055] Take a ternary / lithium titanate single battery with a nominal capacity of 25Ah, charge it to 2.7V with a 1C constant current, charge it to 0.05C at a 2.7V constant voltage, let it stand for 10 minutes, discharge it to 1.5V with a 1C constant current, and let it stand still 10min. The above charge and discharge cycle was carried out 3 times to obtain the actual discharge capacity of the battery, and finally charged with 1C constant current for 20 minutes. Among the batteries with qualified discharge capacity, single batteries with capacity difference within 0.5Ah, AC internal resistance difference within 0.02mΩ, and open circuit voltage difference within 0.02V were screened out. Put the sorted single cells in a high-temperature environment of 55°C for 7 days, then take them out and let them stand in a normal temperature environment for 12 hours, and screen out the cells with the AC internal resistance difference within 0.02mΩ and the open circuit voltage within 0.02V Ba...

Embodiment 3

[0057] Take a ternary / lithium titanate single battery with a nominal capacity of 25Ah, charge it to 2.7V with a 1C constant current, charge it to 0.05C at a 2.7V constant voltage, let it stand for 10 minutes, discharge it to 1.5V with a 1C constant current, and let it stand still 10min. The above charge and discharge cycle was carried out 3 times to obtain the actual discharge capacity of the battery, and finally charged with 1C constant current for 20 minutes. Among the batteries with qualified discharge capacity, single batteries with capacity difference within 0.5Ah, AC internal resistance difference within 0.02mΩ, and open circuit voltage difference within 0.02V were screened out. Put the sorted single cells in a high-temperature environment of 50°C for 10 days, then take them out and let them stand in a normal temperature environment for 12 hours, and screen out the cells with a difference in AC internal resistance within 0.02mΩ and an open circuit voltage within 0.02V B...

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Abstract

The invention relates to a method for sorting the consistency of lithium titanate single batteries. According to the method, both static performance parameters such as capacity, voltage and internal resistance and dynamic parameters such as polarization impedance, large-current charging-discharging capacity and self-discharging capacity are considered. The method comprises the following steps that1, primary sorting is carried out according to parameters such as discharge capacity, open-circuit voltage and alternating-current internal resistance; 2, secondary sorting is carried out after the single batteries undergo high-temperature standing for a period of time; and 3, third-time sorting is carried out on the single batteries subjected to secondary sorting by detecting high-rate pulse discharge conditions, and finally the lithium titanate single batteries with high consistency are obtained. According to the method, the problem that the consistency of single batteries in an existing lithium titanate battery system is difficult to sort is solved; the performance of the battery packs which are formed by the lithium titanate single batteries sorted through the method can be better than that of battery packs which are grouped through a common grouping method; and meanwhile, compared with an existing conventional sorting method, the sorting method is simple to operate, free of redundant equipment investment, short in testing time, and facilitates industrial popularization and application.

Description

technical field [0001] The invention belongs to the technical field of battery detection, and in particular relates to a consistent sorting method for lithium titanate single batteries. Background technique [0002] Lithium-ion batteries are increasingly widely used in new energy passenger vehicles, electric buses, rail transit, starting power supplies, energy storage systems, and weapons and equipment. The requirements are also getting higher and higher. Different from small electronic products such as mobile phones, power and energy storage systems often require multiple series and parallel combinations of single batteries to meet their high output power and large energy storage needs. If the difference between the single cells is too large, the charge state of the single cells will be different during the charging and discharging process, which will lead to a rapid decline in the performance of the entire battery system. As the charge and discharge cycle proceeds, the d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B07C5/344B07C5/36
Inventor 陈永胜张鹏崔维国王茂范随东李爱红
Owner 天津普兰能源科技有限公司
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