CN103616645A - Method for measuring charge state of superlarge battery pack - Google Patents
Method for measuring charge state of superlarge battery pack Download PDFInfo
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- CN103616645A CN103616645A CN201310630046.7A CN201310630046A CN103616645A CN 103616645 A CN103616645 A CN 103616645A CN 201310630046 A CN201310630046 A CN 201310630046A CN 103616645 A CN103616645 A CN 103616645A
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Abstract
The invention relates to a method for measuring the charge state of a superlarge battery pack. When the battery pack is in a charging state or a discharging state, the overall SOC value of a battery pack parallel main circuit main controller is minimum or maximum value of all single cluster battery systems SOC. When charging or discharging of one single cluster battery system is completed, the single cluster battery system is cut off from a charging or discharging system until the overall SOC value is modified to be 100% or 0. Compared with the prior art, the method improves the accuracy of measuring the SOC value of a main circuit, improves the energy conversion rate, and enables the whole battery system to discharge more thoroughly.
Description
Technical field
The present invention relates to a kind of measuring method of ultra-large type electric battery state-of-charge.
Background technology
For night and the flat peak of electrical network on daytime or uninterrupted power source is provided, a lot of large-scale and ultra-large type energy-storage battery systems have been there are at present.In these systems, because battery is many especially, for the ease of controlling the current rear mode in parallel of first series connection that adopted, after battery group, in group, battery cell adopts the mode of series connection to couple together and forms single bunch of battery system, again a plurality of single bunch of battery systems are connected by mode in parallel, and then controlled by a master controller.
Traditional SOC estimation scheme is at present: total SOC gets the mean value of whole system.When in charged state, because first mono-bunch of battery of maximum SOC be full of electricity, cause whole system to stop charging, the electric battery that now SOC is less is not really full of, get off battery is had to damage for a long time, and before system stops charging, total SOC can be modified to 100%, now have battery not to be full of, total SOC value is inaccurate.When discharge condition, because minimum SOC battery reaches the electric discharge limit at first, make whole battery system stop electric discharge, and total SOC is modified to 0, obviously, now larger SOC electric battery does not reach the electric discharge limit, has wasted electric energy, and total SOC value is also inaccurate.
Summary of the invention
For above-mentioned prior art, the technical problem to be solved in the present invention is: a kind of measuring method of ultra-large type electric battery state-of-charge is provided, improves the accuracy of measurement of SOC value.
In order to address the above problem, the measuring method of ultra-large type electric battery state-of-charge of the present invention comprises the steps:
A) charging and discharging state of judgement electric battery
B) when electric battery is during in charged state, the minimum value that the overall SOC value of electric battery major loop master controller in parallel is each single bunch of battery system SOC;
C) when electric battery is during in discharge condition, the maximal value that the overall SOC value of electric battery major loop master controller in parallel is each single bunch of battery system SOC.
Preferably, when described step B sets up, also comprise the steps:
B1) master controller keeps charger to battery system, to charge always;
B2) first single bunch of battery system of SOC maximum is full of electricity;
B3) by the secondary battery management system of this bunch, it is controlled, the SOC of self is carried out being high-endly modified to 100%;
B4) SOC is modified to 100% single bunch of battery system and stops charging;
B5) the single bunch of battery system that stops charging cutting off from major loop in parallel;
B6) return to step B2, until single bunch of all battery systems all cuts off with major loop in parallel, SOC value is high-end while being modified to 100% overall for master controller, and charger stops the charging to battery system.
Preferably, when described step C sets up, also comprise the steps:
C1) battery system continues in discharge condition;
C2) first single bunch of battery system of SOC minimum has discharged;
C3) by the secondary battery management system of this bunch, it is controlled, the SOC of self is carried out to low side and be modified to 0;
C4) SOC is modified to single bunch of battery system of electric battery of 0 and stops electric discharge;
C5) the single bunch of battery system that stops electric discharge cutting off from major loop in parallel;
C6) return to step C2, until single bunch of all battery systems all cuts off with major loop in parallel, master controller is modified at 0 o'clock overall SOC value low side, stops the discharge operation to battery system.
Preferably, single bunch of battery system of described each carries out independent control by a secondary battery management system to it.
Preferably, described secondary battery management system is responsible for the estimation that discharges and recharges control, SOC of this single bunch of battery system, the warning of the setting of this bunch of battery valve value parameter and fault registration, carry out the high low side correction of SOC according to the state of each battery cell in single bunch of battery system.
Compared with prior art, tool of the present invention has the following advantages: one, improved the accuracy of measuring total loop SOC value; Two, improved energy transition rate, whole battery system has been discharged and recharged more thorough.
Accompanying drawing explanation
Fig. 1 is the measuring method process flow diagram of ultra-large type electric battery state-of-charge of the invention process.
Embodiment
In order to allow those skilled in the art understand better technical scheme of the present invention, below in conjunction with accompanying drawing, the present invention is further elaborated.
The specific embodiment of the present invention as shown in Figure 1.A ultra-large type batteries management system, comprises a plurality of battery cells, and wherein, first by battery cell grouping, in group, battery cell adopts the mode of series connection to couple together and forms single bunch of battery system.Each single bunch of battery system carries out independent control by a secondary battery management system, is mainly responsible for the estimation that discharges and recharges controls, SOC of this single bunch of battery system, the warning that the setting of this bunch of battery valve value parameter and fault are registered, carry out the high low side correction of SOC according to the state of each battery cell in single bunch of battery system.A plurality of single bunch of battery systems are connected by mode in parallel, a plurality of secondary battery management systems are connected to master controller again, and unification is controlled by master controller.
When charged state, SOC minimum value in the overall SOC value of major loop master controller in parallel=each single bunch of battery system.First be full of single bunch of electric electric battery, by this bunch of BMS, controlled, the SOC of self is carried out being high-endly modified to 100%, then stop charging, and this bunch of battery cut off from charging system.Because overall SOC value is got SOC minimum in single bunch of battery, therefore master controller keeps charger to charge to battery system always.The single bunch of minimum electric battery of SOC value is normally full of electricity the latest, and the electric battery that those SOC are larger can be full of electricity successively, then from charging system, cuts off successively, until the electric battery of minimum SOC is full of electricity.Due to minimum SOC value=100% in overall SO C value=mono-bunch of battery system, and now all batteries of whole system have all been full of electricity, thus now totally SOC value be 100% to be obviously accurately.In whole charging process, overall SOC value is to change with minimum SOC value, and minimum SOC electric battery is full of the latest, and with it, weighing whole system excess time of charging is also accurately.
When discharge condition, SOC maximal value in the overall SOC value of major loop master controller in parallel=each single bunch of battery system; The overall SOC value of shunt circuit master controller is got maximum SOC value in single bunch of battery.First single bunch of battery of SOC minimum is discharged, and under the control of self BMS, from whole accumulator system, cuts off.The electric battery that other SOC is less can be discharged successively, and from accumulator system, cuts off under the control of self BMS, until the maximum single bunch of battery power discharge of SOC value is complete.This has just guaranteed that all electric battery can both discharge off, is unlikely to because there is no discharge off and the problem of wasting electric energy compared with large SOC value electric battery.After maximum SOC battery power discharge, the BMS of itself can be modified to 0 SOC, and due to maximum SOC value=0 in overall SOC value=mono-bunch of battery system, and whole battery system discharge off all now, totally SOC value is 0 to be obviously accurately.In whole discharge process, overall SOC value is to change with maximum SOC value, and maximum SOC electric battery is discharge off the latest, and with it, weighing whole system dump energy ratio is also accurately.
The measuring method of a kind of ultra-large type electric battery state-of-charge carrying out in this system specifically comprises the steps:
(S00) start
(S01) charging and discharging state of judgement electric battery
(S1) when electric battery is during in charged state, the minimum value that the overall SOC value of electric battery major loop master controller in parallel is each single bunch of battery system SOC;
(S101) master controller keeps charger to battery system, to charge always;
(S102) first single bunch of battery system of SOC maximum is full of electricity;
(S103) by the secondary battery management system of this bunch, it is controlled, the SOC of self is carried out being high-endly modified to 100%;
(S104) SOC is modified to 100% single bunch of battery system and stops charging;
(S105) the single bunch of battery system that stops charging cutting off from major loop in parallel;
(S106) upgrade overall SOC value, return to step (S102), until single bunch of all battery systems all cuts off with major loop in parallel, SOC value is high-end while being modified to 100% overall for master controller, and charger stops the charging to battery system.
(S2) when electric battery is during in discharge condition, the maximal value that the overall SOC value of electric battery major loop master controller in parallel is each single bunch of battery system SOC.
(S201) battery system continues in discharge condition;
(S202) first single bunch of battery system of SOC minimum has discharged;
(S203) by the secondary battery management system of this bunch, it is controlled, the SOC of self is carried out to low side and be modified to 0;
(S204) SOC is modified to single bunch of battery system of electric battery of 0 and stops electric discharge;
(S205) the single bunch of battery system that stops electric discharge cutting off from major loop in parallel;
(S206) upgrade overall SOC value, return to step (S202), until single bunch of all battery systems all cuts off with major loop in parallel, master controller is modified at 0 o'clock overall SOC value low side, stops the discharge operation to battery system.
The above is preferred embodiments of the present invention, not the present invention is done to any pro forma restriction.It should be noted that; in the situation that not deviating from spirit of the present invention and essence thereof; those of ordinary skill in the art are when making according to the present invention various corresponding changes and distortion, but these changes and distortion all should belong to the protection domain of the appended claim of the present invention.
Claims (5)
1. a measuring method for ultra-large type electric battery state-of-charge, is characterized in that: described method comprises the steps:
A) charging and discharging state of judgement electric battery;
B) when electric battery is during in charged state, the minimum value that the overall SOC value of electric battery major loop master controller in parallel is each single bunch of battery system SOC;
C) when electric battery is during in discharge condition, the maximal value that the overall SOC value of electric battery major loop master controller in parallel is each single bunch of battery system SOC.
2. the measuring method of ultra-large type electric battery state-of-charge according to claim 1, is characterized in that, when described step B sets up, also comprises the steps:
B1) master controller keeps charger to battery system, to charge always;
B2) first single bunch of battery system of SOC maximum is full of electricity;
B3) by the secondary battery management system of this bunch, it is controlled, the SOC of self is carried out being high-endly modified to 100%;
B4) SOC is modified to 100% single bunch of battery system and stops charging;
B5) the single bunch of battery system that stops charging cutting off from major loop in parallel;
B6) return to step B2, until single bunch of all battery systems all cuts off with major loop in parallel, SOC value is high-end while being modified to 100% overall for master controller, and charger stops the charging to battery system.
3. the measuring method of ultra-large type electric battery state-of-charge according to claim 2, is characterized in that, when described step C sets up, also comprises the steps:
C1) battery system continues in discharge condition;
C2) first single bunch of battery system of SOC minimum has discharged;
C3) by the secondary battery management system of this bunch, it is controlled, the SOC of self is carried out to low side and be modified to 0;
C4) SOC is modified to single bunch of battery system of electric battery of 0 and stops electric discharge;
C5) the single bunch of battery system that stops electric discharge cutting off from major loop in parallel;
C6) return to step C2, until single bunch of all battery systems all cuts off with major loop in parallel, master controller is modified at 0 o'clock overall SOC value low side, stops the discharge operation to battery system.
4. the measuring method of ultra-large type electric battery state-of-charge according to claim 3, is characterized in that, each described single bunch of battery system carries out independent control by a secondary battery management system to it.
5. the measuring method of ultra-large type electric battery state-of-charge according to claim 4, it is characterized in that, described secondary battery management system is responsible for the setting of the estimation that discharges and recharges control, SOC of this single bunch of battery system, this bunch of battery valve value parameter and the warning of fault registration, according to the state of each battery cell in single bunch of battery system, is carried out the high low side correction of SOC.
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| CN104991202A (en) * | 2015-07-30 | 2015-10-21 | 深圳市大疆创新科技有限公司 | Multi-cell combination system SOC estimating method and related apparatus |
| CN105068006A (en) * | 2015-06-24 | 2015-11-18 | 汪建立 | Fast learning method based on combination of coulomb state of charge (SOC) and voltage SOC |
| CN107482269A (en) * | 2017-07-31 | 2017-12-15 | 北京新能源汽车股份有限公司 | Discharging control method and device of power battery, controller and automobile |
| WO2018145399A1 (en) * | 2017-02-10 | 2018-08-16 | 宁德时代新能源科技股份有限公司 | Method for calibrating state of charge of energy storage system and device |
| US20220268845A1 (en) * | 2021-02-23 | 2022-08-25 | Contemporary Amperex Technology Co., Limited | Charging control method and device, and power management controller |
| CN115079026A (en) * | 2022-06-02 | 2022-09-20 | 国网江苏省电力有限公司电力科学研究院 | SOC automatic calibration method and device suitable for high-voltage energy storage system |
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| CN115079026B (en) * | 2022-06-02 | 2023-12-05 | 国网江苏省电力有限公司电力科学研究院 | SOC automatic calibration method and device suitable for high-voltage energy storage system |
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