CN112332483A - Energy management control method of series lithium battery pack - Google Patents
Energy management control method of series lithium battery pack Download PDFInfo
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- CN112332483A CN112332483A CN202011159595.7A CN202011159595A CN112332483A CN 112332483 A CN112332483 A CN 112332483A CN 202011159595 A CN202011159595 A CN 202011159595A CN 112332483 A CN112332483 A CN 112332483A
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- battery pack
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- lithium battery
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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
- H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
Abstract
The invention discloses an energy management control method of a series lithium battery pack, which comprises the steps of selecting a plurality of high-capacity lithium batteries to be connected in series to form a lithium battery pack, connecting a DC/DC energy management unit in series with the battery output positive electrode of each lithium battery pack, then connecting all the lithium battery packs in parallel on a bus bar through a circuit breaker, and acquiring the SOC difference value of each lithium battery pack by a battery pack monitoring system
Regulating the average value of the output current
And then the average value of the output current and the total current among the battery packs
The output voltage of the equalization management unit is adjusted by the difference value, so that the purpose of adjusting the output power of the battery pack is achieved. The invention provides an energy tubeThe management unit not only ensures that the SOC of each battery pack is basically consistent, but also improves the whole available capacity of the battery pack system.
Description
Technical Field
The invention belongs to the technical field of lithium battery management, and relates to an energy management control method of a series lithium battery pack.
Background
With the increasing demand of energy storage in the direct-current microgrid, a large number of lithium batteries are required to be connected in parallel to meet the demand as main energy storage media. Particularly, under the condition of rapid development of the electric ship industry, the energy management of the whole battery system of the direct current power grid has a profound influence on the endurance capacity of the ship.
At present, due to the influence of factors such as a manufacturing process of a battery cell manufacturer and an assembly process of a battery assembler, the equivalent internal resistances of the parallel battery packs are difficult to be completely consistent, so that the phenomenon of uncontrollable energy distribution exists when the multiple lithium battery packs are in parallel operation, the SOC balance degree of each lithium battery pack is reduced, and the whole available capacity of a battery system is influenced.
In the field of energy storage science, related experts and scholars have proposed to regulate the energy distribution among the individual battery packs through parallel DC/DC conversion devices (PCS). However, this method has disadvantages in that the required DC/DC converter requires a large power level, and increases the cost of the system and the volume of the apparatus.
Disclosure of Invention
The invention aims to overcome the defects and provide the energy management control method of the series lithium battery pack, which not only solves the problem of energy distribution among large-capacity battery packs, but also has the advantages of low cost, small device size and the like compared with a parallel type battery pack.
The technical scheme adopted by the invention for solving the technical problems is as follows: an energy management control method of a series lithium battery pack comprises the following steps:
step 2, obtaining the average value of the current output current of each parallel lithium battery pack through a battery management system BMS
And the obtained data is transmitted back to the DC/DC energy management unit control system of each parallel battery pack;
step 3, calculating the difference value between the average value of the SOC of the lithium battery pack and the current SOC of the lithium battery pack
Adding the SOC error adjustment quantity into current average value control:
current average value of lithium battery pack with low SOC
Lithium battery pack with high SOC (state of charge) up-regulation current average value
Whereink SOCBalancing control coefficients for the lithium battery pack;
step 4, calculating the difference value of the output current average value of the current lithium battery pack and the total battery pack
；
and 6, regulating the output voltage of the direct current conversion unit control system according to the voltage command.
And further judging whether the current working condition of the system is in a heavy-load working condition or not according to the average current value of the lithium battery pack and the current of the lithium battery pack, wherein the heavy-load working condition is that the maximum current of the system battery pack does not exceed the rated current and the average current value of the system battery pack does not exceed 0.9 times of the rated current.
Further, the DC/DC energy management unit adjusts the on-off duty ratio of the related power device according to the voltage instruction.
The invention has the beneficial effects that: according to the invention, the DC/DC energy management unit of the direct current conversion device based on the high transformation ratio is connected in series with the battery output positive electrode of the high-capacity lithium battery pack to adjust the output power of each battery pack and realize energy distribution in the system, so that the energy distribution device not only solves the problem of energy distribution among the high-capacity battery packs, but also has the advantages of small power, low cost, small device size and the like compared with a parallel connection type.
Drawings
FIG. 1 is a diagram of a DC microgrid system of the present invention;
FIG. 2 is a schematic diagram of the control system of the present invention;
fig. 3 is a comparison diagram of the output current of the lithium battery pack and the output of the DC/DC energy management unit under the condition of inconsistent SOC of the battery system.
Detailed Description
The technical solution of the present invention is clearly and completely described below with reference to specific embodiments.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
The invention discloses an energy management control method of a series-connection type lithium battery pack.
The balance control of the whole system mainly comprises the following three parts: the device comprises an energy control part, an equilibrium regulation quantity control part and a high-transformation-ratio direct-current converter constant-voltage output control part. In order to realize the purpose of balanced grid connection of the battery pack, the following technical scheme is adopted.
As shown in fig. 1, a plurality of battery packs are connected in parallel to a common direct current bus; a high-transformation-ratio direct-current converter is connected in series on a positive bus.
The high-transformation-ratio direct-current converter can realize the characteristic of large-voltage input and small-voltage output, and meanwhile, the output side can bear large current.
The following detailed description is provided for the specific implementation steps of the present invention with reference to the accompanying drawings. An energy management control method of a series lithium battery pack comprises the following steps.
Step 2, obtaining the average value of the current output current of each parallel battery pack through a battery management system BMS
And the obtained data is transmitted back to the high-transformation-ratio direct-current converter control system of each parallel battery pack;
step 3, calculating the difference value between the average value of the SOC of the battery pack and the current SOC of the battery pack
(ii) a The SOC error adjustment can be added to the current average control
(ii) a Battery pack down regulation current average value with low SOC
Battery pack with high SOC (state of charge) up-regulation current average value
；
Step 4, calculating the difference value between the current battery pack and the average value of the total battery packs
；
and 6, identifying the control system of the high-transformation-ratio direct-current converter
Whether a voltage source is connected in series is confirmed; when in use
If the output power or SOC of the current parallel battery pack is positive, namely the output power or SOC of the current parallel battery pack is small, a voltage source needs to be connected in series to adjust the total output voltage of the current module; when in use
If the output power of the current parallel battery pack is negative, namely the output power is too low or the SOC is larger, the adjustment is not needed;
and 7, adjusting the on-off duty ratio of the related power device by the control system of the high-transformation-ratio direct current conversion unit according to the voltage instruction.
The patent takes a direct current micro-grid formed by connecting two groups of lithium battery packs in parallel as an example, and further details specific implementation steps of the invention are shown in the attached drawings.
The energy control part is shown in a system control block diagram of fig. 2, and judges whether the current working condition of the system is in a heavy-load working condition or not according to the average value of the battery pack current and the battery pack current, if so, a difference value calculation formula of the current battery pack and the total battery pack average value is adopted
To ensure that the output current of each module is balanced and does not exceed the rated current; under other working conditions, a difference value calculation formula of the current battery pack and the average value of the total battery pack is adopted
And the SOC is regulated. The heavy-load working condition is that the maximum current of the system battery pack does not exceed the rated current and the average value of the system current does not exceed 0.9 times of the rated current.
The balance adjustment quantity control part is shown in figure 3 and is controlled by a high-transformation-ratio direct-current converter control system through identification
Whether a voltage source is connected in series is confirmed; when in use
If the current SOC of the parallel battery pack is positive, namely the SOC of the current parallel battery pack is smaller, a voltage source needs to be connected in series to adjust the total output voltage of the current module; when in use
And if the current parallel battery pack SOC is negative, namely the current parallel battery pack SOC is larger, no regulation is needed.
And in the high-conversion-ratio direct-current converter constant-voltage output control part, a high-conversion-ratio direct-current converter control system regulates the on-off duty ratio of a related power device according to a voltage instruction.
The validity of the present invention is verified below.
A simulation model is built according to the system control block diagram of FIG. 2, and the parameters are as follows: the battery pack parameters are 460V and 1400 Ah; the internal resistance of the battery is 54m omega and 63m omega.
Fig. 3 is a waveform diagram of the SOC variation, the battery pack output current, and the energy management unit output voltage under the non-heavy load condition (the upper diagram is a current waveform, the middle diagram is a waveform diagram of the SOC, and the lower diagram is a waveform of the inverter output voltage). The battery pack with high SOC can be seen, after the voltage is regulated by the high-transformation-ratio direct-current converter, the output current is reduced, the output power is reduced, and the effect of SOC balance and consistency can be achieved through long-term regulation.
The present invention is not limited to the above-mentioned preferred embodiments, and any person skilled in the art can derive other variants and modifications within the scope of the present invention, however, any variation in shape or structure is within the scope of protection of the present invention, and any technical solution similar or equivalent to the present application is within the scope of protection of the present invention.
Claims (3)
1. A method for managing and controlling energy of a series lithium battery pack is characterized in that: comprises the following steps
Step 1, selecting a plurality of high-capacity lithium batteries to be connected in series to form a lithium battery pack, connecting a high-transformation-ratio direct current conversion unit in series at the battery output anode of each lithium battery pack to serve as a DC/DC energy management unit, and then connecting all the lithium battery packs in parallel on a bus bar through a breaker; each lithium battery pack is connected with a battery pack monitoring and managing unit in series, is connected with a battery monitoring system through a CAN bus, and simultaneously sends a driving signal to a direct current conversion unit;
step 2, obtaining the average value of the current output current of each lithium battery pack through the battery pack monitoring and management unit
And back to the DC conversion unit;
step 3, calculating the difference value between the average value of the SOC of the lithium battery pack and the current SOC of the lithium battery pack
Adding the SOC error adjustment quantity into current average value control:
current average value of lithium battery pack with low SOC
Lithium battery pack with high SOC (state of charge) up-regulation current average value
Whereink SOCBalancing control coefficients for the lithium battery pack;
step 4, calculating the difference value of the output current average value of the current lithium battery pack and the total battery pack
；
Step 5, obtaining the output voltage reference value of the DC conversion unit from the positive difference value
And as a control system command, the DC conversion unit control system recognizes
Positive and negative to confirm whether a voltage source is connected in series: when in use
If the output power of the current lithium battery pack is positive, namely the output power of the current lithium battery pack is too high, a voltage source needs to be connected in series to adjust the total output voltage of the current module; when in use
The output power of the current lithium battery pack is negative, namely the output power is too low and does not need to be adjusted;
and 6, regulating the output voltage of the direct current conversion unit control system according to the voltage command.
2. The method according to claim 1, wherein the determination of whether the current operating mode of the system is under a heavy load condition is made according to the average current of the lithium battery pack and the current of the lithium battery pack, and the heavy load condition is determined such that the maximum current of the system battery pack does not exceed the rated current and the average current of the system battery pack does not exceed 0.9 times of the rated current.
3. The method of claim 1, wherein the DC/DC energy management unit adjusts an on-off duty cycle of an associated power device according to the voltage command.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113517747A (en) * | 2021-08-30 | 2021-10-19 | 阳光储能技术有限公司 | Battery cluster balanced energy storage system and control method thereof |
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| US20110313613A1 (en) * | 2009-03-27 | 2011-12-22 | Hitachi Vechicle Energy, Ltd. | Electric Storage Device |
| CN106972618A (en) * | 2017-04-17 | 2017-07-21 | 中国矿业大学 | A kind of remote controlled type Flameproof and intrinsically safe uninterruption power source |
| CN111129619A (en) * | 2019-12-26 | 2020-05-08 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | Power battery cluster management system |
| CN111244931A (en) * | 2020-01-18 | 2020-06-05 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | SOC self-balancing control method for parallel operation of multiple energy storage modules |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110313613A1 (en) * | 2009-03-27 | 2011-12-22 | Hitachi Vechicle Energy, Ltd. | Electric Storage Device |
| CN106972618A (en) * | 2017-04-17 | 2017-07-21 | 中国矿业大学 | A kind of remote controlled type Flameproof and intrinsically safe uninterruption power source |
| CN111129619A (en) * | 2019-12-26 | 2020-05-08 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | Power battery cluster management system |
| CN111244931A (en) * | 2020-01-18 | 2020-06-05 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | SOC self-balancing control method for parallel operation of multiple energy storage modules |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113517747A (en) * | 2021-08-30 | 2021-10-19 | 阳光储能技术有限公司 | Battery cluster balanced energy storage system and control method thereof |
| CN113517747B (en) * | 2021-08-30 | 2024-02-23 | 阳光储能技术有限公司 | Battery cluster balanced energy storage system and control method thereof |
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