A kind of lithium-ion battery low-temperature charging method

A lithium-ion battery and charging method technology, applied in the field of lithium-ion batteries, can solve the problems of poor kinetic conditions, prolonged charging time, battery performance deterioration, etc., so as to improve low-temperature performance, reduce low-temperature charging time, and avoid negative electrode lithium precipitation Effect

Active Publication Date: 2022-04-12
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the operating temperature decreases, the dynamic conditions of the positive and negative electrodes of lithium-ion batteries become worse, the viscosity of the electrolyte increases, and the conductivity decreases. These factors will lead to a sharp decline in the performance of lithium-ion batteries at low temperatures.
What's more serious is that charging at low temperature may lead to lithium deposition at the negative electrode, which will not only cause a sharp deterioration in battery performance, but also cause serious safety hazards
In order to avoid the risk of lithium analysis, enterprises generally use a small charging current (such as 0.2C) to charge the battery at low temperature, but this operation will inevitably lead to the extension of charging time

Method used

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  • A kind of lithium-ion battery low-temperature charging method
  • A kind of lithium-ion battery low-temperature charging method
  • A kind of lithium-ion battery low-temperature charging method

Examples

Experimental program
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Effect test

Embodiment 1

[0026] A ternary battery with a capacity of 50Ah (positive electrode material is NCM622, negative electrode material is artificial graphite, conductive glue is SP and CNTs, binder is PVDF, CMC, SBR) is selected as the experimental object, and it is charged at 0°C at low temperature. The maximum charging current specified by the battery manufacturer at 25°C is 100A (2C). Using the method for determining the critical lithium-analysis potential of the battery provided by the present invention, the critical lithium-analysis potential V2 of this battery cell at 0°C is 4.05V. By calculation, we can calculate the relevant values ​​respectively, namely:

[0027] In the first step, use 100A current to charge the battery to 3.9V in a constant current mode, and let it rest for 5 minutes;

[0028] In the second step, use 50A to charge the battery to 4.05V in a constant current mode, and turn to constant voltage charging until the current drops to 10A;

[0029] The third step is to charg...

Embodiment 2

[0033] Select a lithium iron phosphate battery cell with a capacity of 27Ah (the positive electrode material is LFP, the negative electrode material is artificial graphite, the conductive glue is SP and CNTs, the binder is PVDF, CMC, SBR) as the experimental object, and charge at -10°C at low temperature . The maximum charging current specified by the battery manufacturer at 25°C is 54A (2C). Using the method for determining the critical lithium-evolution potential of the battery provided by the present invention, the critical lithium-evolution potential V2 of this battery cell at 0°C is 3.5V. By calculation, we can calculate the relevant values ​​respectively, namely:

[0034] In the first step, use 54A current to charge the battery to 3.45V in a constant current mode, and let it rest for 5 minutes;

[0035] The second step is to use 27A to charge the battery to 3.5V in a constant current mode and turn to constant voltage charging until the current drops to 5.4A;

[0036] ...

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Abstract

The invention relates to a low-temperature charging method for a lithium ion battery, comprising the following steps: (1) charging the battery to a preset potential V1 with a current I1 in a constant current mode, and the resting time is t1; (2) using a current I2 to charge the battery at a constant current Charge the battery to the preset potential V2 by means of current flow, and then charge the battery at a constant voltage at this potential until the current drops to I3; (3) charge the battery to the cut-off voltage V3 in a constant current manner with current I3, and then Constant voltage charging until the current drops to I4. The invention achieves the effect of improving the low-temperature performance of the battery by changing the low-temperature charging mode without changing the original structure of the battery. Through the charging method of the present invention, while reducing the low-temperature charging time to the greatest extent, lithium deposition at the negative electrode during the low-temperature charging process is avoided.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a low-temperature charging method for lithium ion batteries. Background technique [0002] Lithium-ion batteries realize the mutual conversion of chemical energy and electrical energy through the migration of Li+ between the positive and negative electrodes. With the continuous expansion of the application range of lithium-ion batteries, the application side has higher and higher requirements for the charging and discharging performance of lithium-ion batteries at low temperatures. As the operating temperature decreases, the dynamic conditions of the positive and negative electrodes of lithium-ion batteries become worse, the viscosity of the electrolyte increases, and the conductivity decreases. These factors will lead to a sharp decline in the performance of lithium-ion batteries at low temperatures. What's more serious is that charging at low temperature may lead to lithiu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/44H01M10/0525
CPCH01M10/446H01M10/448H01M10/0525Y02E60/10
Inventor 朱亮吴诺王丰张宏立
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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