CN101908775A - Charging control method and system of lithium ion battery pack - Google Patents
Charging control method and system of lithium ion battery pack Download PDFInfo
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- CN101908775A CN101908775A CN 201010252686 CN201010252686A CN101908775A CN 101908775 A CN101908775 A CN 101908775A CN 201010252686 CN201010252686 CN 201010252686 CN 201010252686 A CN201010252686 A CN 201010252686A CN 101908775 A CN101908775 A CN 101908775A
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- 238000007600 charging Methods 0.000 title claims abstract description 110
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 66
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 44
- 239000000178 monomer Substances 0.000 claims abstract description 56
- 230000008569 process Effects 0.000 claims abstract description 24
- 238000012544 monitoring process Methods 0.000 claims abstract description 11
- 230000000977 initiatory effect Effects 0.000 claims description 7
- 230000009466 transformation Effects 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 238000010280 constant potential charging Methods 0.000 abstract 1
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 208000031639 Chromosome Deletion Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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Abstract
The invention discloses charging control method and system of a lithium ion battery pack, wherein the method comprises the following steps of: charging the lithium ion battery pack through a constant-current value after starting charging, monitoring the voltage of each monomer battery in real time in the whole charging process, and carrying out equalizing charging on a battery with the voltage lower than a mean value by taking the energy from the battery with the voltage higher than the mean value; when the highest voltage of the monomer battery reaches an upper limit value, converting a charging mode, and carrying out constant-voltage charging on the battery pack through the current voltage value of the battery pack; and when the highest voltage of the monomer battery is lower than the resetting value of the preset upper limit value, gradually increasing the charging voltage through preset voltage step length delta V until the voltage of the lithium ion battery pack reaches a preset constant-voltage value, and when the charging current of the lithium ion battery pack is decreased to a preset charging current end value, ending the charging. The system comprises a battery management system, charging equipment and an equalizing unit. Through the invention, the actual charging capacity of the lithium ion battery pack can reach the designed capacity under the condition of ensuring no overcharging.
Description
Technical field
The present invention relates to battery boosting technology, relate in particular to a kind of lithium ion battery group charge control method and system.
Background technology
Lithium ion battery has the advantage that specific energy height, volume are little, have extended cycle life, but very responsive to charging voltage, in charging process, in case charging voltage surpasses its permissible value, shortened the useful life of lithium ion battery, also may cause accidents such as burning, explosion under the serious situation.
In the practical application, adopt the mode of many lithium ion battery series connection to obtain higher output voltage usually.Use for convenient, generally adopt charging device that whole Battery pack is charged.Be subjected to the restriction of lithium ion battery manufacturing process, there is certain difference between the monomer lithium ion battery, although can reduce this species diversity by the method for selecting, but along with the increase that recycles number of times, the difference between this cell can increase gradually, therefore, in charging process, must take suitable charge control method, should guarantee that battery can be full of electricity, prevents the overvoltage that occurs in the charging process again.
Early stage in lithium ion battery applications; the charge control method that adopts is the modified constant-voltage charge method; promptly in charging process; battery protecting plate is monitored the monomer voltage of battery pack in real time; in case the voltage of certain cell reaches higher limit; then disconnect being connected of charger and battery pack at once, charging finishes.Do not overcharge though this charge control method can not cause, can cause the brownout of partial monosomy battery, make battery pack can not reach the discharge capacity requirement.In order to guarantee the discharge capacity of whole Battery pack, early stage charge control method is improved, in battery protecting plate, increased equalization function.In charging process, battery protecting plate is monitored the voltage of cell in real time, for the higher battery of voltage, adopts the mode of bypass charging current, reduces the charging rate of the higher battery of voltage, makes the voltage of each cell keep consistent relatively.In case the voltage of certain cell reaches higher limit, then disconnect being connected of charger and battery pack at once, charging finishes.Though the charge control method after the improvement gets a promotion the charging capacity of battery pack, defective still exists: the charging capacity of lithium ion battery group still is lower than design capacity, and charging current can not be excessive, has limited charge efficiency greatly.
Summary of the invention
The invention provides a kind of lithium ion battery group charge control method and system, can not be excessive in the prior art in order to solve to lithium ion battery group charging current, the actual charging capacity of lithium ion battery group is lower than the problem of design capacity.
Technical scheme of the present invention comprises:
A kind of lithium ion battery group charge control method comprises step:
A, behind charge initiation, the lithium ion battery group is carried out constant current charge with default constant current value, real-time each monomer battery voltage of monitoring in whole charging process, the cell that is higher than mean value from voltage is got energy the sub-average battery of voltage is carried out equalizing charge;
B, when high monomer cell voltage reaches the monomer battery voltage higher limit, the conversion charging modes carries out constant voltage charge as the charging voltage setting value to the lithium ion battery group with current lithium ion battery group voltage;
C, in the constant voltage charge process, when high monomer cell voltage is lower than the resetting value of monomer battery voltage higher limit, charging voltage is raise gradually with predeterminated voltage step delta V, when lithium ion battery group voltage reaches default constant voltage values and lithium ion battery group charging current and is reduced to preset charged electric current end value, complete charge.
Preferably, the cell that adopts the energy branch mode to be higher than mean value from voltage is got energy the sub-average battery of voltage is carried out equalizing charge.
Preferably, the resetting value of described monomer battery voltage higher limit is than the low 20mV of monomer battery voltage higher limit.
Preferably, described default constant current value is the 0.5C-1C ampere.
A kind of lithium ion battery group charge control system comprises battery management system, charging device and balanced unit, wherein,
Battery management system is used at real-time each monomer battery voltage of monitoring of whole charging process, and the control balanced unit is implemented equalizing charge, when high monomer cell voltage reaches the monomer battery voltage higher limit, sends the charging modes transformation directive to charging device; And
In the constant voltage charge process, when monitoring high monomer cell voltage when being lower than the resetting value of monomer battery voltage higher limit, the control charging device is with the predeterminated voltage step delta V charging voltage that raises gradually, when lithium ion battery group voltage reaches default constant voltage values and lithium ion battery group charging current and is reduced to preset charged electric current end value, complete charge;
Charging device, be used for behind charge initiation, the lithium ion battery group being carried out constant current charge with default constant current value, after receiving the charging modes transformation directive, current lithium ion battery group voltage is carried out constant voltage charge as the charging voltage setting value to the lithium ion battery group;
Balanced unit is used under the control of battery management system getting energy from the cell that voltage is higher than mean value the sub-average battery of voltage is carried out equalizing charge.
Preferably, described battery management system also is used for sending startup charging instruction, given constant current value and constant voltage values to charging device.
Preferably, the described balanced unit cell that adopts the energy branch mode to be higher than mean value from voltage is got energy the sub-average battery of voltage is carried out equalizing charge.
Beneficial effect of the present invention is as follows:
After adopting technical scheme of the present invention, because in charging process, balanced unit carries out equilibrium constantly to monomer battery voltage, reduce the charging rate of the high cell of voltage, promote the charging rate of low-voltage battery, therefore can adopt big charging current that battery is charged, can not reach overpressure value ahead of time owing to charging current causes certain batteries overtension more greatly, make the lithium ion battery group guarantee under the situation about not overcharging, its actual charging capacity can reach design capacity, has improved the fail safe and the charge efficiency of lithium ion battery group charging.
Description of drawings
Fig. 1 is the realization principle flow chart of lithium ion battery group charge control method of the present invention;
Fig. 2 is the structural representation of lithium ion battery group charge control system of the present invention.
Embodiment
Below in conjunction with each accompanying drawing specific implementation process of the present invention is given further detailed explanation.
See also Fig. 1, this figure is the realization principle flow chart of lithium ion battery group charge control method of the present invention, and it mainly comprises the steps:
Step S10, charge initiation.
Step S 11, the lithium ion battery group is carried out constant current charge with default constant current value; Real-time each monomer battery voltage of monitoring in whole charging process, the cell that is higher than mean value from voltage by the energy branch mode is got energy the sub-average battery of voltage is carried out equalizing charge;
In this step, default constant current value is the 0.5C-1C ampere.
Step S12, in the constant current charge process, when the high monomer cell voltage that monitors the lithium ion battery group reaches the monomer battery voltage higher limit, change the constant voltage charge stage over to, as the charging voltage setting value lithium ion battery group is carried out constant voltage charge with current lithium ion battery group voltage.
Step S13, in the constant voltage charge process, when high monomer cell voltage is lower than the resetting value of monomer battery voltage higher limit, charging voltage is raise gradually with predeterminated voltage step delta V, reach default constant voltage values and lithium ion battery group charging current is reduced to preset charged electric current end value until lithium ion battery group voltage;
In this step, the resetting value of described monomer battery voltage higher limit is than the low 20mV of monomer battery voltage higher limit.
Step S14, charging finish.
See also Fig. 2, this figure is the structural representation of lithium ion battery group charge control system of the present invention, it mainly comprises battery management system 7, charging device 1 and balanced unit 6, system of the present invention is a Control Parameter with monomer battery voltage 5, batteries charging electric current 3 and battery voltage 4, with battery management system 7 is control centre, is controlling object with charging device 1, balanced unit 6 and lithium ion battery group 2.The main effect of each part of system of the present invention is as follows:
In the constant voltage charge process, when monitoring high monomer cell voltage when being lower than the resetting value of monomer battery voltage higher limit, control charging device 1 is with the predeterminated voltage step delta V charging voltage that raises gradually, when lithium ion battery group voltage 4 reaches default constant voltage values and lithium ion battery group charging current 3 and is reduced to preset charged electric current end value, complete charge;
Balanced unit 6, the cell that is used under the control of battery management system 7 adopting the energy branch mode to be higher than mean value from voltage is got energy the sub-average battery of voltage is carried out equalizing charge.
The concrete course of work of system of the present invention is as follows:
After adopting charging modes of the present invention, because balanced unit 6 carries out equilibrium constantly to monomer battery voltage 5 in charging process, reduce the charging rate of the high cell of voltage, promote the charging rate of low-voltage battery, therefore can adopt big charging current that battery is charged, can not reach overpressure value ahead of time, make the lithium ion battery group guarantee that its actual charging capacity can reach design capacity under the situation about not overcharging owing to charging current causes certain batteries overtension more greatly.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (7)
1. a lithium ion battery group charge control method is characterized in that, comprises step:
A, behind charge initiation, the lithium ion battery group is carried out constant current charge with default constant current value, real-time each monomer battery voltage of monitoring in whole charging process, the cell that is higher than mean value from voltage is got energy the sub-average battery of voltage is carried out equalizing charge;
B, when high monomer cell voltage reaches the monomer battery voltage higher limit, the conversion charging modes carries out constant voltage charge as the charging voltage setting value to the lithium ion battery group with current lithium ion battery group voltage;
C, in the constant voltage charge process, when high monomer cell voltage is lower than the resetting value of monomer battery voltage higher limit, charging voltage is raise gradually with predeterminated voltage step delta V, when lithium ion battery group voltage reaches default constant voltage values and lithium ion battery group charging current and is reduced to preset charged electric current end value, complete charge.
2. the method for claim 1 is characterized in that, the cell that adopts the energy branch mode to be higher than mean value from voltage is got energy the sub-average battery of voltage is carried out equalizing charge.
3. the method for claim 1 is characterized in that, the resetting value of described monomer battery voltage higher limit is than the low 20mV of monomer battery voltage higher limit.
4. the method for claim 1 is characterized in that, described default constant current value is the 0.5C-1C ampere.
5. a lithium ion battery group charge control system is characterized in that, comprises battery management system, charging device and balanced unit, wherein,
Battery management system is used at real-time each monomer battery voltage of monitoring of whole charging process, and the control balanced unit is implemented equalizing charge, when high monomer cell voltage reaches the monomer battery voltage higher limit, sends the charging modes transformation directive to charging device; And
In the constant voltage charge process, when monitoring high monomer cell voltage when being lower than the resetting value of monomer battery voltage higher limit, the control charging device is with the predeterminated voltage step delta V charging voltage that raises gradually, when lithium ion battery group voltage reaches default constant voltage values and lithium ion battery group charging current and is reduced to preset charged electric current end value, complete charge;
Charging device, be used for behind charge initiation, the lithium ion battery group being carried out constant current charge with default constant current value, after receiving the charging modes transformation directive, current lithium ion battery group voltage is carried out constant voltage charge as the charging voltage setting value to the lithium ion battery group;
Balanced unit is used under the control of battery management system getting energy from the cell that voltage is higher than mean value the sub-average battery of voltage is carried out equalizing charge.
6. system as claimed in claim 5 is characterized in that, described battery management system also is used for sending startup charging instruction, given constant current value and constant voltage values to charging device.
7. as claim 5 or 6 described systems, it is characterized in that the cell that described balanced unit adopts the energy branch mode to be higher than mean value from voltage is got energy the sub-average battery of voltage is carried out equalizing charge.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102306941A (en) * | 2011-08-24 | 2012-01-04 | 奇瑞汽车股份有限公司 | Battery pack capacity coupling method and battery pack capacity coupling apparatus |
| US8339100B2 (en) | 2009-09-29 | 2012-12-25 | O2Micro Inc | Systems and methods for cell balancing |
| CN102903976A (en) * | 2012-09-27 | 2013-01-30 | 惠州市亿能电子有限公司 | State of charge (SOC) correction method in pure electric vehicle charging process |
| CN103346606A (en) * | 2013-07-26 | 2013-10-09 | 黄年山 | Self-adaptive variable voltage adjustment pattern |
| CN104836261A (en) * | 2014-02-07 | 2015-08-12 | 鸿富锦精密工业（深圳）有限公司 | Battery pack charging control method and apparatus |
| CN106329643A (en) * | 2016-09-13 | 2017-01-11 | 北京经纬恒润科技有限公司 | Charging control method and charging control system |
| CN107054106A (en) * | 2016-07-25 | 2017-08-18 | 江苏聚合新能源科技有限公司 | A kind of charge control method of lithium ion battery bag |
| CN107579553A (en) * | 2017-08-11 | 2018-01-12 | 湖南小步科技有限公司 | The charge control method and device of a kind of battery management system |
| CN107611504A (en) * | 2017-08-31 | 2018-01-19 | 上海空间电源研究所 | The in-orbit management method of high rail satellite lithium-ions battery group in one kind |
| WO2021057833A1 (en) * | 2019-09-25 | 2021-04-01 | 比亚迪股份有限公司 | Variable step size equalization processing method, and device, medium, battery package, and vehicle |
| CN112952223A (en) * | 2021-03-17 | 2021-06-11 | 深圳市安仕新能源科技有限公司 | Battery charging method and device and battery management system |
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| CN103872727B (en) * | 2014-02-24 | 2017-01-11 | 奇瑞新能源汽车技术有限公司 | Method for determining largest use current of lithium-ion battery |
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| CN102903976A (en) * | 2012-09-27 | 2013-01-30 | 惠州市亿能电子有限公司 | State of charge (SOC) correction method in pure electric vehicle charging process |
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| CN104836261A (en) * | 2014-02-07 | 2015-08-12 | 鸿富锦精密工业（深圳）有限公司 | Battery pack charging control method and apparatus |
| CN107054106B (en) * | 2016-07-25 | 2020-06-19 | 江苏聚合新能源科技有限公司 | Charging control method for lithium ion battery pack |
| CN107054106A (en) * | 2016-07-25 | 2017-08-18 | 江苏聚合新能源科技有限公司 | A kind of charge control method of lithium ion battery bag |
| CN106329643A (en) * | 2016-09-13 | 2017-01-11 | 北京经纬恒润科技有限公司 | Charging control method and charging control system |
| CN106329643B (en) * | 2016-09-13 | 2018-12-14 | 北京经纬恒润科技有限公司 | A kind of charge control method and system |
| CN107579553A (en) * | 2017-08-11 | 2018-01-12 | 湖南小步科技有限公司 | The charge control method and device of a kind of battery management system |
| CN107579553B (en) * | 2017-08-11 | 2024-01-09 | 长沙先度科技有限公司 | Charging control method and device of battery management system |
| CN107611504A (en) * | 2017-08-31 | 2018-01-19 | 上海空间电源研究所 | The in-orbit management method of high rail satellite lithium-ions battery group in one kind |
| WO2021057833A1 (en) * | 2019-09-25 | 2021-04-01 | 比亚迪股份有限公司 | Variable step size equalization processing method, and device, medium, battery package, and vehicle |
| CN112952223A (en) * | 2021-03-17 | 2021-06-11 | 深圳市安仕新能源科技有限公司 | Battery charging method and device and battery management system |
| CN112952223B (en) * | 2021-03-17 | 2022-08-30 | 深圳市安仕新能源科技有限公司 | Battery charging method and device and battery management system |
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