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Charge-discharge management system and method of lithium battery

A discharge management and lithium battery technology, applied in battery circuit devices, safety/protection battery circuits, charge equalization circuits, etc., can solve problems such as irreparable lithium batteries, damaged batteries, safety accidents, etc.

Active Publication Date: 2016-11-16
DONGGUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, battery management systems are widely used in large-scale vehicle batteries such as electric vehicles and hybrid vehicles. However, in the field of electric bicycles, considering its cost and people's consumption levels, battery management systems have not been installed on vehicle batteries. Hydrogen batteries are okay, but with the popularity of lithium battery electric bicycles, in view of the particularity of lithium batteries, improper charging and discharging such as overcharging, overdischarging, overtemperature, overcurrent, etc. will damage the battery, resulting in irreparable damage to the lithium battery. , in severe cases, safety accidents may occur

Method used

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  • Charge-discharge management system and method of lithium battery
  • Charge-discharge management system and method of lithium battery
  • Charge-discharge management system and method of lithium battery

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0075] The lithium battery charge and discharge management system of this embodiment, the lithium battery is composed of N single lithium batteries connected in series, and is characterized in that it includes a microcontroller, a lithium battery monitoring unit connected to the microcontroller, a measurement module, a calculation module, a first switch drive module, a second switch drive module, and a power supply module;

[0076] The power supply module is connected to the mains, which provides power for each module of the system;

[0077] The first switch controls the connection or disconnection between the mains input and the charging module, its input end is connected to the mains, and its output end is connected to the charging module;

[0078] The first switch driving module is connected to the first switch, and controls the conduction or closure of the first switch;

[0079] The second switch controls the connection or disconnection of the lithium battery pack to the ...

Embodiment 2

[0098] Such as figure 2 As shown, the lithium battery charging and discharging management system in this embodiment is based on the first embodiment, and the lithium battery power monitoring module includes a state monitoring unit, a power recording unit, an impedance tracking unit, a computing unit and a lithium battery.

[0099] Among them, the state monitoring unit monitors the current output voltage, output current and ambient temperature of the lithium battery, and the power recording unit records the input power when the lithium battery is charged and the output power when the lithium battery is discharged; the impedance tracking unit calculates the lithium battery after each charging of the lithium battery. Internal impedance, the calculation unit calculates the remaining power of the lithium battery and the remaining working time of the lithium battery according to the input data;

[0100] When the lithium battery is being charged, the state detection unit monitors th...

Embodiment 3

[0135] The lithium battery charge and discharge management method in this embodiment includes:

[0136] When charging: detect the temperature of the battery in real time, define multiple continuous temperature ranges, and each temperature range corresponds to a charging cut-off voltage; compare the temperature value of the battery with the boundary value of the temperature range to see which temperature range it falls in, Get the value of the corresponding charging cut-off voltage, and charge the lithium battery pack according to the charging cut-off voltage;

[0137] The method for determining the charging current of the lithium battery specifically includes:

[0138] Detecting the parameter Ci of the lithium battery cell Li, i takes 1 to n in turn;

[0139] Calculate the charging current Ii of the lithium battery cell Li according to the parameter Ci;

[0140] Charging each of the lithium battery cells according to the charging current Imin, wherein the charging current Im...

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PUM

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Abstract

The invention discloses a charge-discharge management system and method of a lithium battery. The system comprises a microcontroller and a lithium battery monitoring unit, a measurement module, a calculation module, a first switching driving module, a second switching driving module and a power supply module which are connected with the microcontroller, the power supply module is connected with a mains supply and is used for supplying power to each module, a first switch is used for controlling connection or disconnection between an input of the mains supply and a charging module, an input end of the first switch is connected with the mains supply, an output end of the first switch is connected with the charging module, the microcontroller receives signals sent from the lithium battery monitoring unit, a current detection module and a total voltage detection module, analyzing and processing the signals and simultaneously sending the processed signals to the first switching driving module, the charging module and the second switching driving module, so that the charge-discharge of the lithium battery is controlled and managed.

Description

technical field [0001] The invention relates to a lithium battery charging and discharging management system and method. Background technique [0002] With the gradual improvement of lithium battery performance, it has been widely used as a power source in electric vehicles and hybrid vehicles. Generally, the power supply requires a relatively high voltage, and only a few or even a dozen of them can be used as a power battery. When multiple batteries are used in series, based on the inconsistency of the internal characteristics of each single lithium battery, it will affect the power supply capacity of the entire system. If the performance of a single battery changes, such as voltage overcharge and voltage overdischarge , Excessive charging and discharging current or even a short circuit will affect the performance of the entire battery pack, resulting in shortened or damaged service life of the entire battery pack, and even dangerous events such as fire and explosion may o...

Claims

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Application Information

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IPC IPC(8): H02J7/00
CPCH02J7/0018H02J7/0021H02J7/0026
Inventor 张志
Owner DONGGUAN UNIV OF TECH