CN109428363B - Passive equalization strategy optimization method of battery management system - Google Patents
Passive equalization strategy optimization method of battery management system Download PDFInfo
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- CN109428363B CN109428363B CN201710809976.7A CN201710809976A CN109428363B CN 109428363 B CN109428363 B CN 109428363B CN 201710809976 A CN201710809976 A CN 201710809976A CN 109428363 B CN109428363 B CN 109428363B
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000005457 optimization Methods 0.000 title claims abstract description 14
- 230000003068 static effect Effects 0.000 claims abstract description 18
- 238000004364 calculation method Methods 0.000 claims description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 6
- 229910052744 lithium Inorganic materials 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0019—Circuits for equalisation of charge between batteries using switched or multiplexed charge circuits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Abstract
A passive equalization strategy optimization method of a battery management system comprises the following steps: the method comprises the following steps: the battery pack or the battery system is electrified or a key is placed in a NO gear; step two: the battery management system completes system initialization and self-checking; step three: judging whether the battery state is the state after the last charging or not according to the self-checking result, or judging whether the rest time is larger than a set value; step four: performing static open-circuit voltage acquisition of the battery according to the judgment result of the battery state; step five: calculating an equilibrium voltage judgment value (Tp) by the battery management system by using data acquired by the static open-circuit voltage of the battery; step six: the battery with the battery Tn (n is 1, 2, 11.) greater than the equilibrium voltage judgment value (Tp) is the battery needing equilibrium; step seven: calculating the time required by balancing the batteries Tn; step eight: performing an implementation equalization. The invention can solve the problems of short time, low accuracy, poor effect and high failure rate of the traditional lithium battery passive equalization mode.
Description
Technical Field
The invention relates to the technical field of lithium batteries and battery management systems, in particular to a passive equalization strategy optimization method of a battery management system.
Background
With the development of lithium battery technology and the increasing attention on energy conservation and environmental protection, the application field of the lithium battery is wider and wider, such as the application in new energy fields of portable electronic products, electric automobiles, solar power generation systems and the like.
In most applications, multiple sets of cells are required to be connected in series for use to achieve sufficient output voltage and output power. However, since there is inconsistency between the single batteries in the battery pack, after continuous charge and discharge cycles, the states of charge of the single batteries are seriously unbalanced, which means that the voltage divergence between the single batteries is increasingly large, which will permanently damage the batteries.
Currently, equalization management mainly focuses on designing hardware circuits and realizing system control so as to obtain high energy conversion efficiency and equalization speed, and specific influence of an equalization strategy on improvement of battery inconsistency is ignored. At present, the passive balancing mode of most domestic manufacturers is as follows: the charging tail end judges the magnitude of the pressure difference to balance the battery according to the real-time voltage sampled by the battery management system, and the balance mode has the following problems:
the time is short: the equalization is started only when the equalization is concentrated at the charging tail end, and the real-time equalization cannot be performed;
low accuracy, poor effect: the existing balancing mode judges the balancing through the real-time voltage sampled by a battery management system, and has the problems of inaccurate judgment and wrong balancing under the condition that a battery pack is charged with current;
the failure rate is high: in the existing balancing mode, the balancing is judged through the real-time voltage sampled by the battery management system, and the balancing switch of the internal circuit is frequently switched on and switched off, so that the fault rate of the battery management system is increased.
Therefore, a method for optimizing a battery equalization control strategy is urgently needed, an optimal equalization mode is screened through different equalization strategies, the cycle life of a battery pack is prolonged, and the use cost of batteries is reduced.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a passive equalization strategy optimization method of a battery management system, which can solve the problems of short time, low accuracy, poor effect and high failure rate of the conventional lithium battery passive equalization mode.
The purpose of the invention is realized by the following steps:
a passive equalization strategy optimization method of a battery management system is realized by strategy optimization by adopting a passive equalization device of the existing battery management system, and comprises the following steps:
the method comprises the following steps: the battery pack or the battery system is electrified or a key is placed in a NO gear;
step two: the battery management system completes system initialization and self-checking;
step three: judging whether the battery state is the state after the last charging or not according to the self-checking result, or judging whether the static time is larger than a set value or not, if so, entering a fourth step, otherwise, entering an eighth step;
step four: performing static open-circuit voltage acquisition of the battery according to the judgment result of the battery state;
step five: calculating an equilibrium voltage judgment value (Tp) by the battery management system by using data acquired by the static open-circuit voltage of the battery;
step six: the battery with the battery Tn (n is 1, 2, 11.) greater than the equilibrium voltage judgment value (Tp) is the battery needing equilibrium;
step seven: calculating the time required by balancing the batteries Tn;
step eight: performing an implementation equalization.
The method for calculating the equilibrium voltage judgment value (Tp) is as follows:
and the equalizing voltage judgment value (Tp) is the minimum value (Tmin) of the collected static open-circuit voltage of the battery and the set value of the allowable voltage difference.
The calculation method for the time required for balancing the battery Tn according to the SOC value corresponding to the static open-circuit voltage of the battery is as follows:
the time required for balancing the battery Tn (the SOC corresponding to Tn — the SOC corresponding to the balancing voltage determination value (Tp)) is nominal capacity SOH/balancing current.
The set value is 1 min-5 h.
The invention has the following beneficial effects:
the passive equalization strategy optimization method of the battery management system can solve the problems of short time, low accuracy, poor effect and high failure rate of the conventional lithium battery passive equalization mode.
Drawings
FIG. 1 is a flow chart of an embodiment of the present invention.
Detailed Description
The invention is further described with reference to the following figures and examples.
Referring to fig. 1, the passive equalization strategy optimization method of the battery management system, in which the passive equalization is implemented by strategy optimization using a passive equalization apparatus of an existing battery management system, includes the following steps:
the method comprises the following steps: the battery pack or the battery system is electrified or a key is placed in a NO gear;
step two: the battery management system completes system initialization and self-checking;
step three: judging whether the battery state is the state after the last charging or not according to the self-checking result, or judging whether the static time is larger than a set value or not, if so, entering the step four, judging whether the structure is negative, and entering the step eight;
step four: performing static open-circuit voltage acquisition of the battery according to the judgment result of the battery state;
step five: calculating an equilibrium voltage judgment value (Tp) by the battery management system by using data acquired by the static open-circuit voltage of the battery;
step six: the battery with the battery Tn (n is 1, 2, 11.) greater than the equilibrium voltage judgment value (Tp) is the battery needing equilibrium;
step seven: calculating the time required by balancing the batteries Tn;
step eight: and (4) executing the implementation of equalization, and according to the setting requirements of the BMS, equalizing 1 battery or equalizing multiple batteries simultaneously, wherein the actual equalization time is more than or equal to the time required for calculating the equalization battery Tn.
The passive equalization optimization strategy method is characterized in that the mode conditions for judging whether to judge again and calculate the equalization are as follows: whether the battery state is the state after the last charging or the rest time is larger than a set value.
Further, the method of calculating the equilibrium voltage determination value (Tp) is as follows:
the equilibrium voltage judgment value (Tp) is the minimum value (Tmin) + the set value of the allowable voltage difference of the collected battery static open-circuit voltage.
Further, the calculation method of the time required for balancing the battery Tn according to the value of the SOC corresponding to the static open-circuit voltage of the battery is as follows:
the time required for balancing the battery Tn (the SOC corresponding to Tn — the SOC corresponding to the balancing voltage determination value (Tp)) is nominal capacity SOH/balancing current.
Further, the set value is 1 min-5 h, wherein the set value can be set for different time according to different battery characteristics.
The passive equalization optimization strategy method is characterized in that the battery pack or the battery system is powered on or a key is placed in an NO gear, the judgment and calculation of battery equalization are completed after the system initialization and self-check are completed, equalization is executed, and the equalization time and the equalization mode do not need to be judged according to the real-time sampling voltage of the battery management system.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, but rather as the invention is intended to cover all equivalent variations within the scope and spirit of the present invention.
Claims (1)
1. A passive equalization strategy optimization method of a battery management system is characterized in that passive equalization is realized by strategy optimization by adopting a passive equalization device of the existing battery management system, and the method is characterized by comprising the following steps of:
the method comprises the following steps: the battery pack or the battery system is electrified or a key is arranged in an ON gear;
step two: the battery management system completes system initialization and self-checking;
step three: judging whether the battery state is the state after the last charging or not according to the self-checking result, or judging whether the static time is larger than a set value or not, if so, entering the step four, otherwise, entering the step eight;
step four: performing static open-circuit voltage acquisition of the battery according to the judgment result of the battery state;
step five: the battery management system calculates an equilibrium voltage judgment value Tp by using data acquired by the static open-circuit voltage of the battery;
step six: when the static open-circuit voltage value of the battery Tn is greater than the equalization voltage judgment value Tp, the battery Tn is a battery needing equalization, and n is a positive integer;
step seven: calculating the time required by balancing the batteries Tn;
step eight: performing real-time equalization on the battery Tn;
the method for calculating the equalizing voltage judgment value Tp is as follows:
the equalizing voltage judgment value Tp is the minimum value Tmin + allowable voltage difference setting value of the collected static open-circuit voltage of the battery;
according to the value of SOC corresponding to the static open-circuit voltage of the battery, the calculation method of the time required by the battery Tn for balancing is as follows:
the time required by the balancing battery Tn is (the Tn corresponds to the SOC-the balancing voltage judgment value Tp corresponds to the SOC) and the nominal capacity SOH/the balancing current;
the set value is 1 min-5 h.
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