CN102437613A - Lithium ion battery equalization system and equalization method thereof - Google Patents
Lithium ion battery equalization system and equalization method thereof Download PDFInfo
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- CN102437613A CN102437613A CN2011104224169A CN201110422416A CN102437613A CN 102437613 A CN102437613 A CN 102437613A CN 2011104224169 A CN2011104224169 A CN 2011104224169A CN 201110422416 A CN201110422416 A CN 201110422416A CN 102437613 A CN102437613 A CN 102437613A
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- lithium ion
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 25
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000005070 sampling Methods 0.000 claims abstract description 25
- 238000007599 discharging Methods 0.000 claims abstract description 6
- 239000000178 monomer Substances 0.000 claims description 2
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
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Abstract
The invention relates to a lithium ion battery equalization system and an equalization method thereof, wherein the equalization system comprises a battery module formed by connecting 12 batteries in series, a sampling control module and an equalization control module. The sampling control module is used for collecting the voltage value of each single battery in the battery module, the temperature value of the battery module and sampling the current. And determining a single battery pack to be balanced according to the acquired result, wherein the single battery pack to be balanced comprises one single battery in the battery module or comprises two or more adjacent single batteries in the battery module. The equalization control module is used for controlling the single battery pack to be equalized to charge or discharge. By adopting the battery equalization method, the imbalance phenomenon among the batteries can be reduced even through multiple charging and discharging processes, so that the performance of the battery module is improved, and the service life of the battery is prolonged.
Description
Technical field
The present invention relates to a kind of lithium ion battery equalizing system and balanced charging method thereof.
Background technology
A batteries is connected or is formed in parallel by many batteries.These batteries are in use and normal charge, because cell degradation and battery temperature are different, and the phenomenon that can produce electrolysis liquid density, capacity, voltage etc. are uneven.In this case, carry out the discharge of a period of time with big electric current, can cause unbalanced the acquiring a certain degree between the battery, thereby can cause battery to cause nonvolatil damage because the pole reversal in use appears in the little battery of capacity when battery pack.
Summary of the invention
The object of the present invention is to provide a kind of equalization methods of lithium-ion-power cell, make and to carry out balance in the battery charge and discharge process and discharge and recharge, keep battery soc in the reasonable scope, extending battery life.
Concrete technical scheme is following:
A kind of lithium ion battery equalizing system comprises battery module, controlling of sampling module and balanced control module,
Said controlling of sampling module connects battery module, and it is used for gathering the parameter of each cell of battery module, and according to the SOC of each cell of calculation of parameter of the cell of gathering;
Said balanced control module is connected with the controlling of sampling module and can receives the information that the controlling of sampling module is sent;
Said balanced control module control connection discharges and recharges branch road, and discharges and recharges branch road according to the said information Control that receives the one or more cells in the battery module are carried out charge or discharge, treats that up to said balanced cell reaches balanced.
Further, said parameter is the actual voltage value of each cell, the current value and the actual temperature of battery module.
Further, actual SOC of battery that calculates according to the controlling of sampling module and given SOC scope compare, to confirm unbalanced single battery.
Further, said information is for carrying out balanced cell numbering.
Further, said one or more cell is a unbalanced single battery.
Further, said battery module is composed in series by 12 joint monomer lithium ion batteries.
Further, the said branch road that discharges and recharges is a gating circuit, and said balanced control module confirms to treat balanced battery according to sampled voltage, sample rate current and the temperature of each batteries, and the control gating circuit is treated balanced battery and carried out charge or discharge.
Further; Said controlling of sampling module is a controlling of sampling circuit, and it confirms the current actual SOC of cell, and the actual SOC of cell and the SOC scope of nominal are compared; With definite unbalanced cell numbering, and calculate the time that needs equilibrium.
The equalization methods of above-mentioned lithium ion battery equalizing charge system, adopt following steps:
(1) the controlling of sampling module is carried out voltage, electric current and temperature acquisition to battery module;
(2) the controlling of sampling module is according to the actual SOC of cell in the battery module under voltage, electric current and the temperature value calculating current state of actual acquisition;
(3) the controlling of sampling module compares according to actual SOC and given cell SOC, judges that it is whether in given scope;
(4) obtain actual SOC greater than the maximum of given range or less than the minimum value of given range when judgement, can judge then that this joint cell possibly overcharged or cross and put, promptly be judged as and treat balanced cell;
(5) balanced control module is charged to the cell less than the given range minimum value to discharging greater than the peaked cell of given range, after reaching given range, stops.
Further, the cell numbering control gating circuit that balanced control module basis is treated equilibrium in the step (5) carries out charge or discharge with charge power supply and the cell connection of treating equilibrium to battery.
Compare with present prior art, the invention solves because through repeatedly discharging and recharging the unbalanced problem that causes battery, prolong battery useful life.
Description of drawings
Fig. 1 lithium ion battery equalizing system sketch map
Fig. 2 is used for the flow chart of lithium ion battery balanced charging method
Fig. 3 is used for the flow chart of lithium ion battery balanced discharge method
Embodiment
Describe the present invention according to accompanying drawing below, it is a kind of preferred embodiment in the numerous embodiments of the present invention.
Fig. 1 is for being used for lithium ion battery equalizing system sketch map.As shown in Figure 1, the equalizing charge system that is used for lithium ion battery that instance of the present invention provides comprises battery module, acquisition control module and balanced control module.Said acquisition control module is used to gather the actual voltage value of each cell, the current value and the actual temperature of battery module; Calculate the SOC of each cell according to the magnitude of voltage of gathering, temperature and current value; Compare according to actual SOC of battery that calculates and given SOC scope, to confirm unbalanced single battery.Balanced control module receives need carry out balanced cell numbering, controls to discharge and recharge branch road and treat that to described balanced cell carries out charge or discharge, treats that up to said balanced cell reaches balanced.
Fig. 2 and shown in Figure 3 be the flow chart of a kind of lithium ion battery equalizing charge or charging method.The practical implementation step is following:
1. at first the battery pack that contains 12 joint cells is carried out voltage, electric current and temperature acquisition through acquisition module;
2. calculate the actual SOC of cell under the current state through voltage, electric current and the temperature value of actual acquisition.
3. compare according to actual SOC and given cell SOC, whether in given scope.If greater than the maximum of given range or less than the minimum value of given range, can judge then that this joint cell possibly overcharged or cross and put.Be judged as and treat balanced cell.
4. according to judgement,, the battery less than the given range minimum value is charged, just stop up to reaching given range to discharging greater than the peaked battery of given range.
The purpose of present embodiment is to solve because the series connected battery module through repeatedly discharging and recharging the unbalanced big problem of SOC difference between the cell that causes, provides a kind of unbalanced single battery of the nominal SOC stated range minimum that does not reach given in the cell that makes to reach balanced method.The equalizing system that is used for 12 joint cell series connected battery groups that present embodiment provides comprises battery module, controlling of sampling module, the balanced control module that is composed in series by 12 joint lithium ion batteries.Said battery module is composed in series by 12 joint cells.Said acquisition control module is used to gather the temperature of magnitude of voltage, electric current and the battery module of each cell in the said battery module, and confirms to treat balanced battery pack according to collection result.Said balanced control module is used to control the said cell group of equilibrium of treating and carries out charge or discharge.
The equalization methods that is used for cell series connected battery group that present embodiment provides comprises that each cell is carried out voltage sample obtains actual voltage value, and battery pack is carried out current sample and temperature sampling.Calculate the SOC of each cell according to the magnitude of voltage of gathering, temperature and current value; Compare according to actual SOC of battery that calculates and given SOC scope; To confirm actual SOC greater than the peaked unbalanced single battery of given SOC scope, perhaps actual SOC is less than the unbalanced single battery of given SOC stated range minimum.The balanced control module that present embodiment provides receives need carry out balanced cell numbering; Control and discharge and recharge branch road and treat that to described balanced cell carries out charge or discharge, when the said actual SOC that treats balanced cell reaches given scope, stop charge or discharge.
Combine accompanying drawing that the present invention has been carried out exemplary description above; Obviously the concrete realization of the present invention does not receive the restriction of aforesaid way; As long as the various improvement of having adopted method design of the present invention and technical scheme to carry out; Or directly apply to other occasion without improvement, all within protection scope of the present invention.
Claims (10)
1. a lithium ion battery equalizing system is characterized in that, comprises battery module, controlling of sampling module and balanced control module,
Said controlling of sampling module connects battery module, and it is used for gathering the parameter of each cell of battery module, and according to the SOC of each cell of calculation of parameter of the cell of gathering;
Said balanced control module is connected with the controlling of sampling module and can receives the information that the controlling of sampling module is sent;
Said balanced control module control connection discharges and recharges branch road, and discharges and recharges branch road according to the said information Control that receives the one or more cells in the battery module are carried out charge or discharge, treats that up to said balanced cell reaches balanced.
2. lithium ion battery equalizing system as claimed in claim 1 is characterized in that, said parameter is the actual voltage value of each cell, the current value and the actual temperature of battery module.
3. according to claim 1 or claim 2 lithium ion battery equalizing system is characterized in that, actual SOC of battery that calculates according to the controlling of sampling module and given SOC scope compare, to confirm unbalanced single battery.
4. like each described lithium ion battery equalizing system among the claim 1-3, it is characterized in that said information is for carrying out balanced cell numbering.
5. like each described lithium ion battery equalizing system among the claim 1-4, it is characterized in that said one or more cells are unbalanced single battery.
6. like each described lithium ion battery equalizing system among the claim 1-5, it is characterized in that said battery module is composed in series by 12 joint monomer lithium ion batteries.
7. like each described lithium ion battery equalizing system among the claim 1-6; It is characterized in that; The said branch road that discharges and recharges is a gating circuit; Said balanced control module confirms to treat balanced battery according to sampled voltage, sample rate current and the temperature of each batteries, and the control gating circuit is treated balanced battery and carried out charge or discharge.
8. like each described lithium ion battery equalizing system among the claim 1-7; It is characterized in that; Said controlling of sampling module is a controlling of sampling circuit, and it confirms the current actual SOC of cell, and the actual SOC of cell and the SOC scope of nominal are compared; With definite unbalanced cell numbering, and calculate the time that needs equilibrium.
9. like the equalization methods of the said lithium ion battery equalizing system of claim 1-8, it is characterized in that, adopt following steps:
(1) the controlling of sampling module is carried out voltage, electric current and temperature acquisition to battery module;
(2) the controlling of sampling module is according to the actual SOC of cell in the battery module under voltage, electric current and the temperature value calculating current state of actual acquisition;
(3) the controlling of sampling module compares according to actual SOC and given cell SOC, judges that it is whether in given scope;
(4) obtain actual SOC greater than the maximum of given range or less than the minimum value of given range when judgement, can judge then that this joint cell possibly overcharged or cross and put, promptly be judged as and treat balanced cell;
(5) balanced control module is charged to the cell less than the given range minimum value to discharging greater than the peaked cell of given range, after reaching given range, stops.
10. like the equalization methods of the said lithium ion battery equalizing system of claim 9; It is characterized in that; The cell numbering control gating circuit that balanced control module basis is treated equilibrium in the step (5) carries out charge or discharge with charge power supply and the cell connection of treating equilibrium to battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104224169A CN102437613A (en) | 2011-12-16 | 2011-12-16 | Lithium ion battery equalization system and equalization method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011104224169A CN102437613A (en) | 2011-12-16 | 2011-12-16 | Lithium ion battery equalization system and equalization method thereof |
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| CN102437613A true CN102437613A (en) | 2012-05-02 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103515993A (en) * | 2012-06-15 | 2014-01-15 | 凹凸电子（武汉）有限公司 | Equalizing charge detector and method, and battery management system |
| CN104364116A (en) * | 2012-08-08 | 2015-02-18 | 丰田自动车株式会社 | Electrical storage system and equalizing method |
| CN106253387A (en) * | 2016-08-18 | 2016-12-21 | 厦门日臻动力电源科技有限公司 | A kind of charger of lithium ion multi-string battery group |
| CN107453382A (en) * | 2017-09-11 | 2017-12-08 | 吉林大学 | A kind of stabilized power source and control method |
| CN107546816A (en) * | 2017-10-20 | 2018-01-05 | 中车株洲电力机车有限公司 | A kind of equalization methods, equipment and the readable storage medium storing program for executing of accumulation power supply module voltage |
| WO2019042365A1 (en) * | 2017-08-31 | 2019-03-07 | 比亚迪股份有限公司 | Battery equalization method and system, vehicle, storage medium, and electronic device |
| WO2019042362A1 (en) * | 2017-08-31 | 2019-03-07 | 比亚迪股份有限公司 | Battery equalization system, vehicle, battery equalization method, and storage medium |
| CN109435758A (en) * | 2017-08-31 | 2019-03-08 | 比亚迪股份有限公司 | Battery equalization method, system, vehicle, storage medium and electronic equipment |
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| WO2006052044A9 (en) * | 2004-11-11 | 2006-12-07 | Lg Chemical Ltd | Method and system for cell equalization using state of charge |
| WO2010016661A2 (en) * | 2008-08-08 | 2010-02-11 | 주식회사 엘지화학 | Apparatus and method for cell balancing using the voltage variation behavior of battery cell |
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2011
- 2011-12-16 CN CN2011104224169A patent/CN102437613A/en active Pending
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| CN1574540A (en) * | 2003-06-19 | 2005-02-02 | 美国凹凸微系有限公司 | Chargeable cell monitoring and balancing circuit |
| WO2006052044A9 (en) * | 2004-11-11 | 2006-12-07 | Lg Chemical Ltd | Method and system for cell equalization using state of charge |
| WO2010016661A2 (en) * | 2008-08-08 | 2010-02-11 | 주식회사 엘지화학 | Apparatus and method for cell balancing using the voltage variation behavior of battery cell |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103515993A (en) * | 2012-06-15 | 2014-01-15 | 凹凸电子（武汉）有限公司 | Equalizing charge detector and method, and battery management system |
| CN104364116A (en) * | 2012-08-08 | 2015-02-18 | 丰田自动车株式会社 | Electrical storage system and equalizing method |
| CN104364116B (en) * | 2012-08-08 | 2016-12-28 | 丰田自动车株式会社 | Accumulating system and equalization methods |
| CN106253387A (en) * | 2016-08-18 | 2016-12-21 | 厦门日臻动力电源科技有限公司 | A kind of charger of lithium ion multi-string battery group |
| WO2019042365A1 (en) * | 2017-08-31 | 2019-03-07 | 比亚迪股份有限公司 | Battery equalization method and system, vehicle, storage medium, and electronic device |
| WO2019042362A1 (en) * | 2017-08-31 | 2019-03-07 | 比亚迪股份有限公司 | Battery equalization system, vehicle, battery equalization method, and storage medium |
| CN109435758A (en) * | 2017-08-31 | 2019-03-08 | 比亚迪股份有限公司 | Battery equalization method, system, vehicle, storage medium and electronic equipment |
| CN109435773A (en) * | 2017-08-31 | 2019-03-08 | 比亚迪股份有限公司 | Battery equalization method, system, vehicle, storage medium and electronic equipment |
| CN109435773B (en) * | 2017-08-31 | 2022-02-08 | 比亚迪股份有限公司 | Battery equalization method, system, vehicle, storage medium and electronic device |
| CN107453382A (en) * | 2017-09-11 | 2017-12-08 | 吉林大学 | A kind of stabilized power source and control method |
| CN107453382B (en) * | 2017-09-11 | 2023-05-12 | 吉林大学 | Stable power supply and control method |
| CN107546816A (en) * | 2017-10-20 | 2018-01-05 | 中车株洲电力机车有限公司 | A kind of equalization methods, equipment and the readable storage medium storing program for executing of accumulation power supply module voltage |
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Application publication date: 20120502 |