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Discharging method for secondary battery

A technology for secondary batteries and battery charging, which is used in secondary battery charging/discharging, secondary battery repair/maintenance, etc., and can solve problems such as poor cycle performance, battery heating, and uneven current density distribution of single cells.

Inactive Publication Date: 2015-01-21
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 discharge method for secondary batteries, so as to improve the uneven distribution of current density between single cells or inside the battery, battery heating, Problems such as poor cycle performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] 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:

[0059] 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;

[0060] 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;

[0061] Step 3: When the current is less than 0.3A during 53.2V constant voltage chargin...

Embodiment 2

[0068] 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:

[0069] 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;

[0070] 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 charg...

Embodiment 3

[0076] According to the multi-stage constant voltage charging method of the secondary battery as mentioned above, the specific charging 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:

[0077] Step 1: Charge with 200kW charging power (260A current) until the battery pack voltage reaches 694.4V;

[0078] 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;

[0079] 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, curren...

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Abstract

The present invention relates to a discharging method for a secondary battery. The discharging method of the present invention adopts a shallow discharging mode, and discharging currents at an initial discharging stage and a final discharging stage are reduced to reduce influence on battery performances due to non-uniform current density distribution between parallelly-connected single batteries or inside the battery so as to improve battery performances. In particular, with the discharging method for the secondary battery in the present invention, discharging currents at the discharging starting stage and the discharging ending stage are reduced to carry out discharging, the influence on the battery performances due to non-uniform current density between parallelly-connected single batteries or inside the battery can be reduced so as to improve the battery performances; and reduction of the power of the electrical equipment is adopted to reduce the discharging current, such that the simpleness purpose is achieved.

Description

technical field [0001] The parent case of the present invention is the name of the invention: discharge method of secondary battery, application number 201010506881.6, application date: October 14, 2010, especially related to the field of secondary battery use, especially a kind of discharge of secondary battery method. 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 hig...

Claims

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Application Information

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IPC IPC(8): H01M10/44
CPCY02E60/10
Inventor 林道勇
Owner 林道勇
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