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Multi-stage constant-voltage charging method of lithium secondary battery

A lithium secondary battery, constant voltage charging technology, applied in secondary battery charging/discharging, secondary battery repair/maintenance, etc., can solve the problems of battery heating, poor cycle performance, uneven current density distribution of single batteries, etc.

Inactive Publication Date: 2013-10-16
林道勇 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] The technical problem to be solved by the present invention is to provide a new multi-stage constant-voltage charging method for lithium secondary batteries, so as to improve the charging method of lithium secondary batteries, such as full charging, full discharging, and commonly used single-step constant voltage and current-limiting charging. Prone problems such as uneven distribution of current density between single cells or inside the battery, battery heating, poor cycle performance, etc.

Method used

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  • Multi-stage constant-voltage charging method of lithium secondary battery
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] According to the above-mentioned multi-stage constant voltage charging method for lithium secondary batteries, the specific charging steps of 108 strings of 345.6V, 40Ah lithium ferrous phosphate battery packs for hybrid vehicles are as follows:

[0060] Step 1: Charge with 40A current for 3 minutes;

[0061] Step 2: Use a constant charging voltage of 372.6V, a current limit of 120A, set a constant voltage charging cut-off current of 40A, and a constant voltage charging time of 3 minutes for constant charging voltage and current limiting charging;

[0062] Step 3: When charging at a constant voltage of 372.6V, the current is less than 40A or the constant voltage charging time is longer than 3 minutes, that is, the voltage of the corresponding single battery is 3.45V, and the state of charge is about 60%, then charge with a current of 120A to The voltage of the battery pack reaches 378V;

[0063] Step 4: When the voltage of the battery pack reaches 378V, use a constant ...

Embodiment 2

[0067] According to the above-mentioned multi-stage constant voltage charging method for lithium secondary batteries, the specific charging steps of 78 strings of 288V, 100Ah lithium manganate battery packs for pure electric vehicles are as follows:

[0068] Step 1: Use a constant charging voltage of 304.2V, a current limit of 20A, set a constant voltage charging cut-off current of 5A, and a constant voltage charging time of 30 minutes for constant charging voltage and current limiting charging;

[0069] Step 2: When charging at 304.2V constant voltage, the current is less than 5A or the constant voltage charging time is longer than 30 minutes, that is, the corresponding single battery voltage is 3.90V, and the state of charge is about 35%, and then the constant charging voltage is 312V. The current limit is 50A, the constant voltage charging cut-off current is set to 12.5A, and the constant voltage charging time is 30 minutes for constant charging voltage and current limiting ...

Embodiment 3

[0075] According to the above-mentioned multi-stage constant voltage charging method for lithium secondary batteries, the energy storage power station with a rated charging and discharging power of 500kW uses 320 strings of 768V, 4000Ah lithium titanate battery packs (rated charging and discharging current is 650A) The charging steps are:

[0076] Step 1: Charge with 200kW charging power (260A current) until the battery pack voltage reaches 694.4V;

[0077] Step 2: When the voltage of the battery pack reaches 694.4V, use a constant charging voltage of 761.6V, a current limit of 650A (charging power of 500kW), set a constant voltage charging cut-off current of 260A, and a constant voltage charging time of 30 minutes. Constant charging voltage and current limiting charging;

[0078] Step 3: When charging at 761.6V constant voltage, the current is less than 260A or the constant voltage charging time is longer than 30 minutes, then use constant charging voltage to 784V, current l...

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Abstract

The invention relates to a multistage constant-voltage charging method. In the charging method, a shallow charging mode is adopted, and charging and discharging currents are decreased at the initial stage and the final stage of charging and discharging so as to lower the influence of uneven current density distribution among parallel monomer batteries or inside the batteries on battery performances, therefore, the battery performance is improved. Particularly, in the multistage constant-voltage charging method of the lithium secondary battery, the multistage constant-voltage charging is realized by judging the charging current and charging time and changing the charging voltage according to a judging result. The charging method can be used for effectively lowering the influence of the uneven current density distribution among the parallel monomer batteries or inside the batteries on the battery performances under the condition that the total charging time is not influenced greatly, thereby improving the performances of the monomer batteries or a battery pack.

Description

technical field [0001] The invention relates to the field of using lithium secondary batteries, in particular to a charging method for lithium secondary batteries. Background technique [0002] Lithium secondary battery is an ideal power source because of its high working voltage, small size, light weight and long cycle life. [0003] With the development of electric bicycles, electric motorcycles, micro electric vehicles, electric cars, electric buses, backup power sources, and energy storage power stations, the demand for battery packs with higher total energy is also increasing. Due to the use of single large-capacity batteries or low-voltage large-capacity battery packs, the current is large, the wires are thick, and the energy efficiency is low, so the voltage of the battery pack cannot be made too low; but in terms of insulation, safety and electronic components. From the perspective of consistency, the voltage of the battery pack cannot be made too high, so the capac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/44
CPCY02E60/12Y02E60/10
Inventor 林道勇
Owner 林道勇
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