CN105576767A - Balanced lithium battery pack and balancing method thereof - Google Patents

Balanced lithium battery pack and balancing method thereof Download PDF

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Publication number
CN105576767A
CN105576767A CN201610096485.8A CN201610096485A CN105576767A CN 105576767 A CN105576767 A CN 105576767A CN 201610096485 A CN201610096485 A CN 201610096485A CN 105576767 A CN105576767 A CN 105576767A
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CN
China
Prior art keywords
lithium battery
lithium
battery
switch
microprocessor
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Pending
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CN201610096485.8A
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Chinese (zh)
Inventor
冉柠恺
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冉柠恺
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Priority to CN201610096485.8A priority Critical patent/CN105576767A/en
Publication of CN105576767A publication Critical patent/CN105576767A/en
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H02J7/0014Circuits for equalisation of charge between batteries
    • H02J7/0019Circuits for equalisation of charge between batteries using switched or multiplexed charge circuits

Abstract

The invention provides a balanced lithium battery pack and a balancing method thereof and relates to the technical field of lithium batteries. The balanced lithium battery pack comprises one group of single lithium battery units, a balancing unit, a positive and negative output electrode (2) and a total electric control output switch (3), wherein one group of the single lithium battery units are connected in parallel; the positive and negative output electrode (2) is electrically connected with two poles of one group of the single lithium battery units, which are connected in parallel, through the total electric control output switch (3); each single lithium battery unit comprises a single lithium battery (1), an electric control on/off switch (4) and a voltage sensor (5); and each electric control on/off switch (4) is used for controlling the corresponding single lithium battery (1) to be switched in or switched off to a parallel circuit. With the adoption of the balanced lithium battery pack, the disadvantages in the prior art are overcome, and a balancing problem of the lithium battery is solved by adopting an intelligent mini-type chip, so that the power supply stability of the lithium battery pack is greatly improved and the service life of the lithium battery pack is prolonged; and the balanced lithium battery pack has very good practical values.

Description

A kind of balanced lithium battery group and equalization methods thereof
Technical field
The present invention relates to technical field of lithium batteries, be specifically related to a kind of balanced lithium battery group and equalization methods thereof.
Background technology
The battery pack be made up of multiple cell connection in series-parallel, after using through long-time charge and discharge, there will be unbalanced phenomena between its inner each cell.Such as, during charging, partial monosomy battery has charged complete, but partial monosomy battery is not also substituted the bad for the good, and so, the complete cell that first charges can be overcharged.During electric discharge, partial monosomy battery discharge off, the end but partial monosomy battery does not also discharge, so, the cell of first discharge off can be crossed to be put.Super-charge super-discharge can life-span of badly damaged battery pack, causes battery pack to lose efficacy ahead of time.Therefore need to take measures to do equilibrium to eliminate unbalanced phenomena to battery pack.Conventional equalization has active equalization method by circuit realiration and passive equalization.Passive equalization by circuit, cell high for voltage is connected a load resistance to discharge to it, judge that whether its voltage is identical with the voltage of other cells by comparison circuit, electric discharge is just stopped if identical, the shortcoming of passive equalization is the energy consuming cell, produce heat, time for balance is long.Active equalization method refers to when discharge and recharge, the energy content of battery higher for voltage is not fallen by resistance consumption, but by its energy transferring to the lower battery of voltage, thus realize the balance charge/discharge of lithium battery group; Active equalization circuit is complicated, and can not carry out equilibrium to all batteries, reliability has much room for improvement simultaneously.
Summary of the invention
Object of the present invention mainly in order to solve the problems of the technologies described above, and provides a kind of balanced lithium battery group and equalization methods thereof.
A kind of balanced lithium battery group of the present invention comprises one group of single-lithium-battery pool unit, balanced unit, positive and negative output electrode and total automatically controlled output switch, be connected in parallel between described one group of single-lithium-battery pool unit, described positive and negative output electrode is electrically connected with one group of single-lithium-battery pool unit the two poles of the earth of above-mentioned parallel connection by total automatically controlled output switch, described single-lithium-battery pool unit comprises single lithium battery, automatically controlled on-off switch and voltage sensor, described automatically controlled on-off switch controls single lithium battery and is incorporated to or is disconnected to parallel circuits, the magnitude of voltage of described voltage sensor monitoring single lithium battery, described balanced unit comprises Analog input mModule, microprocessor and switching value output module, described voltage sensor is connected by communication by Analog input mModule and microprocessor, described microprocessor controls the Kai Heguan of one group of automatically controlled on-off switch of single-lithium-battery pool unit and total automatically controlled output switch respectively by switching value output module.
Also have charhing unit, described charhing unit is electrically connected with one group of single-lithium-battery pool unit the two poles of the earth by charging electric-controlled switch, and microprocessor controls the break-make of charging electric-controlled switch by switching value output module.
Described microprocessor is single-chip microcomputer.
A kind of battery pack equilibrium method of balanced lithium battery group, during charging, the magnitude of voltage of the voltage sensor Real-Time Monitoring single lithium battery of one group of single-lithium-battery pool unit, and be transferred to microprocessor by Analog input mModule, microprocessor controls the break-make of automatically controlled on-off switch by switching value output module according to monitoring result, the single lithium battery realizing making voltage low is preferentially charged, when the magnitude of voltage of each single lithium battery is tending towards equal, each single lithium battery is charged simultaneously, until charging complete;
During electric discharge, the magnitude of voltage of the voltage sensor Real-Time Monitoring single lithium battery of one group of single-lithium-battery pool unit, and be transferred to microprocessor by Analog input mModule, microprocessor controls the break-make of automatically controlled on-off switch by switching value output module according to monitoring result, realize the single lithium battery preferential discharge that voltage is high, when the magnitude of voltage of each single lithium battery is tending towards equal, each single lithium battery is discharged simultaneously;
Time abnormal, there is too high or too low exception in the magnitude of voltage that microprocessor monitors single lithium battery, and microprocessor controls total automatically controlled output switch by switching value output module and disconnects.
Advantage of the present invention is: the invention provides a kind of balanced lithium battery group and equalization methods thereof, overcome the deficiency existed in prior art, adopt the equalization problem of intelligentized microchip process lithium battery, substantially increase the stability that lithium battery group is powered, extend the useful life of lithium battery group, there is good practical value.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
In figure: 1, single lithium battery; 2, positive and negative output electrode; 3, total automatically controlled output switch; 4, automatically controlled on-off switch; 5, voltage sensor; 6, Analog input mModule; 7, microprocessor; 8, switching value output module.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described.
As shown in Figure 1, a kind of balanced lithium battery group of the present invention comprises one group of single-lithium-battery pool unit, balanced unit, positive and negative output electrode 2 and total automatically controlled output switch 3, be connected in parallel between described one group of single-lithium-battery pool unit, described positive and negative output electrode 2 is electrically connected with one group of single-lithium-battery pool unit the two poles of the earth of above-mentioned parallel connection by total automatically controlled output switch 3, described single-lithium-battery pool unit comprises single lithium battery 1, automatically controlled on-off switch 4 and voltage sensor 5, described automatically controlled on-off switch 4 controls single lithium battery 1 and is incorporated to or is disconnected to parallel circuits, described voltage sensor 5 monitors the magnitude of voltage of single lithium battery 1, described balanced unit comprises Analog input mModule 6, microprocessor 7 and switching value output module 8, described voltage sensor 5 is connected by communication by Analog input mModule 6 and microprocessor 7, described microprocessor 7 controls the Kai Heguan of one group of automatically controlled on-off switch of single-lithium-battery pool unit 4 and total automatically controlled output switch 3 respectively by switching value output module 8.
Also have charhing unit, described charhing unit is electrically connected with one group of single-lithium-battery pool unit the two poles of the earth by charging electric-controlled switch, and microprocessor 7 controls the break-make of charging electric-controlled switch by switching value output module 8.
Described microprocessor 7 is single-chip microcomputers.
A kind of battery pack equilibrium method of balanced lithium battery group, during charging, the magnitude of voltage of the voltage sensor 5 Real-Time Monitoring single lithium battery 1 of one group of single-lithium-battery pool unit, and be transferred to microprocessor 7 by Analog input mModule 6, microprocessor 7 controls the break-make of automatically controlled on-off switch 4 by switching value output module 8 according to monitoring result, the single lithium battery 1 realizing making voltage low is preferentially charged, when the magnitude of voltage of each single lithium battery 1 is tending towards equal, each single lithium battery 1 is charged simultaneously, until charging complete;
During electric discharge, the magnitude of voltage of the voltage sensor 5 Real-Time Monitoring single lithium battery 1 of one group of single-lithium-battery pool unit, and be transferred to microprocessor 7 by Analog input mModule 6, microprocessor 7 controls the break-make of automatically controlled on-off switch 4 by switching value output module 8 according to monitoring result, realize voltage high single lithium battery 1 preferential discharge, when the magnitude of voltage of each single lithium battery 1 is tending towards equal, each single lithium battery 1 is discharged simultaneously;
Time abnormal, there is too high or too low exception in the magnitude of voltage that microprocessor 7 monitors single lithium battery 1, microprocessor 7 controls total automatically controlled output switch 3 by switching value output module 8 and disconnects.
Operation principle: the principle of active voltage equilibrium that what lithium battery of the present invention equilibrium adopted is, the current voltage of each cell is reached unanimity, for realizing when discharge and recharge, the voltage of single lithium battery reaches unanimity, high-precision voltage sensor is adopted to carry out voltage monitoring to single lithium battery in real time, and by chip microcontroller break-make being realized to each switch, when reaching charging, low pressure single lithium battery is preferentially charged; Electric discharge, the object of high pressure single lithium battery preferential discharge, finally makes each single lithium battery voltage in lithium battery group be in the state of a relative equilibrium.

Claims (4)

1. a balanced lithium battery group, it is characterized in that it comprises one group of single-lithium-battery pool unit, balanced unit, positive and negative output electrode (2) and total automatically controlled output switch (3), be connected in parallel between described one group of single-lithium-battery pool unit, described positive and negative output electrode (2) is electrically connected with one group of single-lithium-battery pool unit the two poles of the earth of above-mentioned parallel connection by total automatically controlled output switch (3), described single-lithium-battery pool unit comprises single lithium battery (1), automatically controlled on-off switch (4) and voltage sensor (5), described automatically controlled on-off switch (4) controls single lithium battery (1) and is incorporated to or is disconnected to parallel circuits, the magnitude of voltage of described voltage sensor (5) monitoring single lithium battery (1), described balanced unit comprises Analog input mModule (6), microprocessor (7) and switching value output module (8), described voltage sensor (5) is connected by communication by Analog input mModule (6) and microprocessor (7), described microprocessor (7) controls the Kai Heguan of one group of automatically controlled on-off switch of single-lithium-battery pool unit (4) and total automatically controlled output switch (3) respectively by switching value output module (8).
2. the balanced lithium battery group of one according to claim 1, it is characterized in that charhing unit in addition, described charhing unit is electrically connected with one group of single-lithium-battery pool unit the two poles of the earth by charging electric-controlled switch, and microprocessor (7) controls the break-make of charging electric-controlled switch by switching value output module (8).
3. the balanced lithium battery group of one according to claim 1 and 2, is characterized in that described microprocessor (7) is single-chip microcomputer.
4. a battery pack equilibrium method for balanced lithium battery group, is characterized in that:
During charging, the magnitude of voltage of voltage sensor (5) the Real-Time Monitoring single lithium battery (1) of one group of single-lithium-battery pool unit, and be transferred to microprocessor (7) by Analog input mModule (6), microprocessor (7) controls the break-make of automatically controlled on-off switch (4) by switching value output module (8) according to monitoring result, the single lithium battery (1) realizing making voltage low is preferentially charged, when the magnitude of voltage of each single lithium battery (1) is tending towards equal, each single lithium battery (1) is charged simultaneously, until charging complete;
During electric discharge, the magnitude of voltage of voltage sensor (5) the Real-Time Monitoring single lithium battery (1) of one group of single-lithium-battery pool unit, and be transferred to microprocessor (7) by Analog input mModule (6), microprocessor (7) controls the break-make of automatically controlled on-off switch (4) by switching value output module (8) according to monitoring result, realize the high single lithium battery of voltage (1) preferential discharge, when the magnitude of voltage of each single lithium battery (1) is tending towards equal, each single lithium battery (1) is discharged simultaneously;
Time abnormal, there is too high or too low exception in the magnitude of voltage that microprocessor (7) monitors single lithium battery (1), microprocessor (7) controls the disconnection of total automatically controlled output switch (3) by switching value output module (8).
CN201610096485.8A 2016-02-18 2016-02-18 Balanced lithium battery pack and balancing method thereof Pending CN105576767A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108674226A (en) * 2018-05-18 2018-10-19 华中科技大学 A kind of lithium battery balanced management system based on half platform in kind

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CN102593888A (en) * 2012-01-17 2012-07-18 浙江凯能科技有限公司 Storage battery balanced charging and discharging control system
TWI431896B (en) * 2011-04-15 2014-03-21 Simplo Technology Co Ltd Battery balancing circuit and balancing method thereof and battery module activating method
CN103795150A (en) * 2014-03-07 2014-05-14 山东圣阳电源股份有限公司 Hybrid energy storage system and application method thereof
CN104064827A (en) * 2014-06-26 2014-09-24 四川宝生新能源电池有限公司 Nickel-metal hydride battery pack with safety protection system
CN104737411A (en) * 2012-11-07 2015-06-24 株式会社丰田自动织机 Voltage equalization device
US20150194707A1 (en) * 2014-01-06 2015-07-09 Samsung Sdi Co., Ltd. Battery pack, energy storage system including the battery pack, and method of operating the battery pack
CN105048586A (en) * 2015-08-10 2015-11-11 深圳供电局有限公司 Automatic balance control device and method for storage batteries

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI431896B (en) * 2011-04-15 2014-03-21 Simplo Technology Co Ltd Battery balancing circuit and balancing method thereof and battery module activating method
CN102593888A (en) * 2012-01-17 2012-07-18 浙江凯能科技有限公司 Storage battery balanced charging and discharging control system
CN104737411A (en) * 2012-11-07 2015-06-24 株式会社丰田自动织机 Voltage equalization device
US20150194707A1 (en) * 2014-01-06 2015-07-09 Samsung Sdi Co., Ltd. Battery pack, energy storage system including the battery pack, and method of operating the battery pack
CN103795150A (en) * 2014-03-07 2014-05-14 山东圣阳电源股份有限公司 Hybrid energy storage system and application method thereof
CN104064827A (en) * 2014-06-26 2014-09-24 四川宝生新能源电池有限公司 Nickel-metal hydride battery pack with safety protection system
CN105048586A (en) * 2015-08-10 2015-11-11 深圳供电局有限公司 Automatic balance control device and method for storage batteries

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108674226A (en) * 2018-05-18 2018-10-19 华中科技大学 A kind of lithium battery balanced management system based on half platform in kind

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Application publication date: 20160511

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