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Method for charging and discharging lithium secondary battery

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

Inactive Publication Date: 2014-12-03
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 discharge method for lithium secondary batteries, so as to improve single-step charging, full discharge, and commonly used single-step constant voltage and current limiting charging of lithium secondary batteries. Problems such as uneven distribution of current density between bulk batteries or inside the battery, battery heating, poor cycle performance, etc.

Method used

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  • Method for charging and discharging lithium secondary battery
  • Method for charging and discharging lithium secondary battery

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 the constant voltage charging cut-off current to 260A, and constant voltage charging time to 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 method for charging and discharging a lithium secondary battery. The discharging method of the invention adopts a shallow discharging mode. The discharging method of the lithium secondary battery comprises the following steps: step b1: reducing the power of electric equipment so as to reduce the discharge current and start to discharge; step b2: discharging the normal discharging current; and step b3: reducing the power of the electric equipment so as to reduce the discharging current and finish the discharging. The discharging current is reduced to discharge at both the beginning and the ending of discharging, the influence on the battery performance for the uneven current density between the monomer batteries linked in parallel or the inner part of the monomer battery can be reduced, so that the battery performance is improved; the discharging current can be lowered by reducing the power of the electric equipment, the method is simple to realize.

Description

technical field [0001] The parent case of the present invention is the name of the invention: charging and discharging method of lithium secondary battery, application number 201010506882.0, application date: October 14, 2010, which relates to the field of lithium secondary battery use, especially a lithium secondary battery How to charge and discharge the secondary battery. 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 voltag...

Claims

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Application Information

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