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Automobile lithium battery discharging balance method and balance system

A technology for balancing systems and lithium batteries, which is applied in the direction of battery continuous discharge, secondary battery charging/discharging, battery circuit devices, etc. It can solve the problems of unadjustable discharge current, poor battery balance, and too little discharge, etc., to prolong life , good effect, low energy consumption

Inactive Publication Date: 2012-08-29
SUNWODA ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, the size of the discharge resistor is fixed, and its discharge current cannot be adjusted, which may lead to the occurrence of partial discharge or partial overdischarge, which will eventually lead to worse battery balance.

Method used

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  • Automobile lithium battery discharging balance method and balance system
  • Automobile lithium battery discharging balance method and balance system

Examples

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Embodiment 1

[0033] This embodiment discloses a discharge balancing method for an automobile lithium battery, which is used to balance the difference between individual cells when the automobile lithium battery pack is in a discharging state, and the battery pack includes a plurality of single cells connected in series;

[0034] A DC-DC conversion circuit is connected to both ends of each single battery, and the input terminals of the DC-DC conversion circuit are connected to the two output voltage terminals of the battery pack; the purpose of the DC-DC conversion circuit It is to reduce the voltage at both ends of the battery pack to recharge the low-voltage single battery, realize energy transfer, and avoid the short board effect of the wooden barrel, that is: the discharge time is determined by the lowest single battery.

[0035] During the discharge process, the remaining power of the battery pack is monitored in real time; if the remaining power of the battery pack is 20% to 30%, the f...

Embodiment 2

[0042] Such as figure 1As shown, this embodiment discloses a discharge balancing system for a lithium battery for an automobile, which is used to balance the difference between individual cells when the lithium battery pack of an automobile is in a discharging state. The battery pack 1 includes a plurality of single cells connected in series. body battery 11; the balance system includes: lower computer 2, upper computer 3, switch circuit 5, and DC-DC conversion circuit 4, lower computer 2 is a PLC or a single-chip microcomputer, and upper computer 3 is a main control module including a CPU , the switch circuit 5 can be a field effect tube; the input end of the DC-DC conversion circuit 4 is connected to both ends of the battery pack 1, and its output end is connected to each single battery 11 through a switch circuit 5 , carry out compensatory charging to each monomer battery 11; The lower computer 2 is connected to both ends of each said monomer battery 11, collects the voltag...

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Abstract

The invention belongs to the technical field of motive power battery management and particularly discloses an automobile lithium battery discharging balance method and a balance system. Aiming at a battery pack about to be emptied, the invention provides the method and the system for realizing the balance. When the discharging is about to finish, i.e. the rest electric quantity of the battery pack is 20 percent to 30 percent, discharging balance measures are started to be used: the output voltages at two ends of the battery pack are properly reduced and are loaded to two ends of few partial low-voltage single batteries for electricity supplementing, the emptying speed of the low-voltage batteries is reduced, so all single batteries nearly reach the emptying state at the same time, and the discharging time is further prolonged. The balance method and the balance system have the advantages that differences among all single batteries are balanced, the service life of the battery pack is prolonged, meanwhile, the energy consumption is lower, the efficiency is higher, and the effect is better.

Description

technical field [0001] The invention belongs to the technical field of power battery management, and in particular relates to a discharge balancing method and a balancing system for an automobile lithium battery. Background technique [0002] In order to meet the voltage, power and energy requirements of high-power equipment such as electric vehicles, the battery pack is mostly composed of a large number of power batteries connected in series. Although the difference between batteries is gradually reduced with the improvement of technology, it is still difficult to ensure that the characteristics of each battery are completely consistent at the current level of manufacturing technology. Especially under working conditions, irregular charging and discharging are frequently carried out, and the difference between the batteries will deteriorate after the battery pack has been working for a period of time, thereby reducing the use efficiency and life of the battery pack. [000...

Claims

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Application Information

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IPC IPC(8): H02J7/00
CPCH01M10/44H02J7/0014H02J7/0025H02J7/0063Y02E60/10
Inventor 王明旺李武歧李载波
Owner SUNWODA ELECTRONICS
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