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Charging and discharging method for secondary battery

A secondary battery, battery voltage technology, applied in 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: 2011-02-16
林道勇 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] The technical problem to be solved by the present invention is to provide a new charging and discharging method for secondary batteries, so as to improve the single-step charging and discharging methods that are easy to occur in the secondary battery full charge, full discharge, and commonly used single-step constant voltage and current limiting charging. 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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  • Charging and discharging method for secondary battery
  • Charging and discharging method for secondary battery
  • Charging and discharging method for secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] According to the multi-stage constant voltage charging method of the secondary battery as mentioned above, the specific charging steps of 24 strings of 48V, 15Ah lead-acid secondary battery packs for electric motorcycles are as follows:

[0075] Step 1: Use a constant charging voltage of 47.6V, a current limit of 3A, set a constant voltage charging cut-off current of 0.3A, and a constant voltage charging time of 30 minutes for constant charging voltage and current limiting charging;

[0076] Step 2: When charging at a constant voltage of 47.6V, the current is less than 0.3A or the charging time at constant voltage is longer than 30 minutes, then use a constant charging voltage of 53.2V, limit the current to 3A, and set the cut-off current of constant voltage charging to 0.3A. The constant voltage charging time is 30 minutes for constant charging voltage and current limiting charging;

[0077] Step 3: When the current is less than 0.3A during 53.2V constant voltage charg...

Embodiment 2

[0084] According to the multi-stage constant voltage charging method of the secondary battery as mentioned above, the specific charging steps of the 78-string 288V, 100Ah lithium manganate battery pack for pure electric vehicles are as follows:

[0085] 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;

[0086] 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 voltage of the corresponding single battery 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 limitin...

Embodiment 3

[0092] According to the multi-stage constant voltage charging method of the secondary battery as mentioned above, the specific charge of 320 strings of 768V, 4000Ah lithium titanate battery packs (rated charge and discharge current is 650A) for the energy storage power station with a rated charge and discharge power of 500kW The steps are:

[0093] Step 1: Charge with 200kW charging power (260A current) until the battery pack voltage reaches 694.4V;

[0094] 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;

[0095] 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 ...

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Abstract

The invention relates to a multi-stage constant-voltage charging method for a secondary battery and a discharging method for the secondary battery. The charging and the discharging methods respectively adopt the shallow charging mode and the shallow discharging mode and reduce the charging current and the discharging current at the early stage and the late stage of charging and discharging, thereby reducing the impact of non-uniform distribution of current density among parallel-connected monomer batteries or in the battery on the performances of the battery, and further improving the performances of the battery. Particularly, the multi-stage constant-voltage charging method for the secondary battery can realize the multi-stage constant-voltage charging by judging the charging current and the charging time and changing the charging voltage according to the judgment result. The charging method can effectively improve the impact of the non-uniform current density distribution among the parallel-connected monomer batteries or in the battery on the performances of the battery and improve the performances of the monomer batteries or a battery pack under the situation of having little impact on the total charging time.

Description

technical field [0001] The invention relates to the application field of secondary batteries, in particular to a method for charging and discharging secondary batteries. Background technique [0002] 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 capacity of the battery pack cannot be too low. After comprehensive consideration, a battery pack with higher voltage and larger capacity is re...

Claims

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Application Information

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