CN116865316A - Modularized energy-storage bidirectional converter - Google Patents
Modularized energy-storage bidirectional converter Download PDFInfo
- Publication number
- CN116865316A CN116865316A CN202310687615.5A CN202310687615A CN116865316A CN 116865316 A CN116865316 A CN 116865316A CN 202310687615 A CN202310687615 A CN 202310687615A CN 116865316 A CN116865316 A CN 116865316A
- Authority
- CN
- China
- Prior art keywords
- battery
- capacity
- unit
- control unit
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000004146 energy storage Methods 0.000 title claims abstract description 32
- 230000002457 bidirectional effect Effects 0.000 title claims abstract description 27
- 238000012360 testing method Methods 0.000 claims abstract description 29
- 238000007599 discharging Methods 0.000 claims abstract description 22
- 238000001514 detection method Methods 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 11
- 230000008569 process Effects 0.000 claims abstract description 11
- 239000003990 capacitor Substances 0.000 claims description 11
- 230000004044 response Effects 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 5
- 238000012546 transfer Methods 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 description 6
- 238000012216 screening Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Classifications
-
- 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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
- H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The application provides a modularized energy-storage bidirectional converter which comprises a plurality of battery units arranged on a battery rack cabin in an electric cabinet, wherein a discharge load, a detection unit and a control unit are also arranged in the electric cabinet, the discharge load is used for sequentially connecting each battery unit to carry out a discharge test on the battery units, the detection unit and the discharge load are synchronously connected with each battery unit and used for carrying out voltage and current detection on each battery unit in the discharging process of each battery unit, a manipulator transfer unit is used for transferring one battery unit calibrated as a main battery and transferring another battery unit calibrated as an auxiliary battery. The output ends of the battery units connected in parallel are sequentially connected with a first DC/AC circuit and a boost circuit, the output ends of the battery units connected in series are connected with a second DC/AC circuit, the control unit controls the boost circuit to serve as an output circuit of an external load before switching time, and controls the second DC/AC circuit to serve as an output circuit of the external load after switching time.
Description
Technical Field
The application relates to the technical field of energy storage, in particular to a modularized energy storage bidirectional converter.
Background
The bidirectional converter is an energy storage converter, also called a bidirectional energy storage inverter, is applied to an alternating-current coupling energy storage system such as grid-connected energy storage, micro-grid energy storage and the like, is connected between a storage battery pack and a power grid (or a load), and is a device for realizing bidirectional conversion of electric energy. The direct current of the storage battery can be inverted into alternating current and transmitted to a power grid or used for alternating current load, the alternating current of the power grid can be rectified into direct current to charge the storage battery, and in a micro-grid system formed by multiple energy sources, the bidirectional converter is the most core equipment.
The prior bidirectional converter adopts modularized energy storage, namely most of used energy storage batteries are retired batteries on the electric automobile and are connected into an energy storage module. Since the output voltage of the single cell is only 15V of direct current, in order to convert to 220V mains voltage of alternating current, each cell needs to be connected in series to increase the output voltage, and then the mains voltage is converted by a DC/AC circuit. However, since each battery is not shipped uniformly by one manufacturer, there is a problem that each battery is unbalanced during use, and even if batteries of the same capacity and the same voltage are screened before assembly, such a problem cannot be avoided. The discharge time of each battery in series discharge is limited by the minimum capacity, so that the aging of the battery with the minimum capacity is accelerated for a long time, and the discharge efficiency is low during each discharge.
Disclosure of Invention
The application aims to solve the technical problem and provides a modularized energy storage bidirectional converter.
The technical scheme of the application is that the bidirectional converter comprises a plurality of battery units arranged on a battery rack cabin in an electric cabinet, wherein a discharging load, a detecting unit and a control unit are also arranged in the electric cabinet, the discharging load is used for sequentially connecting each battery unit to carry out a discharging test, the detecting unit and the discharging load are synchronously connected with each battery unit and are used for carrying out voltage and current detection on each battery unit in the discharging process of each battery unit, the control unit respectively marks half of the battery units with the detected capacity close to each battery unit and the rest half of the battery units as a main battery and an auxiliary battery, and the manipulator transferring unit is used for displacing one battery unit marked as the main battery and the other battery unit marked as the auxiliary battery; the control unit generates switching time according to capacity measurement test data of the battery units calibrated as auxiliary batteries, the switching time takes starting time of the battery units calibrated as auxiliary batteries as time zero point, the parallel battery unit output ends are sequentially connected with a first DC/AC circuit and a boost circuit, the serial battery unit output ends are connected with a second DC/AC circuit, the boost circuit is controlled to serve as an output circuit for external load before the switching time, and the second DC/AC circuit is controlled to serve as an output circuit for external load after the switching time.
As one embodiment, the switching time is an interval time, and the switching time includes a first time node and a second time node, the first time node is earlier than the second time node in time sequence, the control unit controls the series-connected battery units to be turned on to enable the second DC/AC circuit to serve as an output circuit for external load, and the control unit controls the parallel-connected battery units to be turned off to stop the boost circuit from serving as an output circuit for external load.
As an embodiment, the switching time is configured after one actual loss capacity of the maximum capacity in the parallel battery cells is half.
In one embodiment, the control unit is configured to, when calibrating the main battery and the auxiliary battery, remove the battery cell having the largest capacity and the battery cell having the smallest capacity, and then select the calibration having the capacity close to that of the remaining battery cells as the main battery.
As an implementation mode, positive electrode wires are connected between positive electrodes of the battery units, negative electrode wires are connected between negative electrodes of the battery units, positive electrode wires, negative electrode wires, positive electrode parallel contactors and negative electrode parallel contactors are connected between the positive electrode wires and the negative electrode wires of the adjacent battery units, nodes of the positive electrode wires divide the positive electrode wires into a first wire section and a second wire section, the negative electrode wires divide the negative electrode wires into a third wire section and a fourth wire section, positive electrode parallel contactors are arranged on the first wire section, negative electrode parallel contactors are arranged on the fourth wire section, series connection contactors are arranged on the positive electrode wires and the negative electrode wires, the positive electrode wires, the negative electrode wires, the positive electrode parallel contactors, the negative electrode parallel contactors and the series connection contactors are integrated on a connecting cover plate, and the connecting cover plate is connected with the positive electrode and the negative electrode of the adjacent battery units.
As one embodiment, the positive parallel contactor, the negative parallel contactor, and the series contactor are interlocked.
As one embodiment, the positive parallel contactor and the negative parallel contactor are synchronously switched in response to a control signal of the control unit, and the series contactor is synchronously switched in response to a control signal of the control unit, so that the battery unit calibrated as a main battery and the battery unit calibrated as a secondary battery can be switched between series connection and parallel connection.
As an embodiment, before the battery unit calibrated as the auxiliary battery is started, the control unit controls the discharge load and the detection unit to access the battery unit calibrated as the main battery, so as to perform a discharge test on the battery unit for the same number of times as the battery unit, in each discharge process, the battery unit calibrated as the first capacity is insufficient and provides auxiliary output voltage for the battery unit, so that the battery unit continuously participates in the next discharge test, meanwhile, the control unit generates a time node for providing auxiliary output voltage, at the end of the last discharge test, the control unit generates a time node for providing auxiliary output voltage for the battery unit with the last capacity being insufficient, and takes the last time node as a reference time, a discharge time corresponding to each battery unit one by one is generated between the last time node and each other time node, the control unit generates a capacity compensation amount corresponding to each battery unit according to each discharge time and voltage and current data measured in the discharge test, each battery unit is connected in series, the control unit is configured with the two capacity compensation units in each capacity switching mode until the two capacity compensation units are connected in parallel, and the two capacity compensation units are connected in each capacity switching mode, and the capacity compensation unit is controlled until the two capacity compensation units reach the actual capacity switching value.
As one embodiment, the compensation capacitor is a capacitor whose capacity can be adjusted.
As an embodiment, the control unit causes the compensation capacitor to turn on the battery cells connected in series after the actual capacity reaches a configuration value.
Compared with the prior art, the application has the beneficial effects that after the battery units are respectively marked as the main battery and the auxiliary battery through the capacity measurement test, the battery units marked as the main battery are connected in series, and the battery units marked as the auxiliary battery are connected in parallel, so that the battery units can be output as two paths, wherein the main battery has good consistency due to more strict screening, and is not easy to be limited by the capacity of a single battery unit. And then, outputting the half battery units in parallel so that the half battery units remained after screening can be put into service. Then one group is connected with the first DC/AC circuit and the boost circuit at the back, and the other group is connected with the second DC/AC circuit at the back, and the switching time is used as a time node to enable the output of the first DC/AC circuit and the boost circuit to be converted. Therefore, the modularized energy storage bidirectional converter is free from the limitation of the capacity of a single battery unit, can have stable output for a longer time, and improves the energy conversion efficiency as a whole.
Drawings
Fig. 1 is a functional schematic diagram of a bidirectional converter with modularized energy storage according to an embodiment of the present application;
fig. 2 is a schematic diagram of a series-connected battery cell according to an embodiment of the present application;
fig. 3 is a schematic diagram of parallel battery cells according to an embodiment of the present application;
fig. 4 is a schematic connection diagram of each battery unit according to an embodiment of the present application;
fig. 5 is a schematic connection diagram of each battery cell and a compensation capacitor according to an embodiment of the present application.
In the figure: 100. an electric cabinet; 200. a battery rack compartment; 300. a battery unit; 400. a discharge load; 500. a detection unit; 600. a control unit; 700. a manipulator transfer unit; 800. a first DC/AC circuit; 900. a booster circuit; 1000. a second DC/AC circuit; 1100. a positive electrode lead; 1200. a negative electrode lead; 1300. positive and negative electrode wires; 1400. a first wire segment; 1500. a second wire segment; 1600. a third wire segment; 1700. a fourth wire segment; 1800. the positive electrode is connected with the contactor in parallel; 1900. the negative electrode is connected with the contactor in parallel; 2000. a series contactor; 2100. connecting a cover plate; 2200. compensating the capacitance.
Detailed Description
The foregoing and other embodiments and advantages of the application will be apparent from the following, more complete, description of the application, taken in conjunction with the accompanying drawings. It will be apparent that the described embodiments are merely some, but not all, embodiments of the application.
In one embodiment, as shown in fig. 1-3.
The modularized energy storage bidirectional converter provided by the embodiment comprises a plurality of battery units 300 arranged on a battery rack cabin 200 in an electric cabinet 100, wherein a discharging load 400, a detecting unit 500 and a control unit 600 are further arranged in the electric cabinet 100, the discharging load 400 is used for sequentially connecting each battery unit 300 to carry out a discharging test, the detecting unit 500 and the discharging load 400 are synchronously connected with each battery unit 300 and used for carrying out voltage and current detection on each battery unit 300 in the discharging process of each battery unit 300, the control unit 600 respectively marks half of the battery units 300 with close measured capacities and the rest half of the battery units 300 as main batteries and auxiliary batteries, the manipulator transferring unit 700 is used for displacing one position of the battery units 300 marked as the main batteries and displacing the other position of the battery units 300 marked as the auxiliary batteries. The battery units 300 calibrated as main batteries are connected in series, the battery units 300 calibrated as auxiliary batteries are connected in parallel, the control unit 600 generates switching time according to capacity measurement test data of the battery units 300 calibrated as auxiliary batteries, the switching time takes starting time of the battery units 300 calibrated as auxiliary batteries as time zero point, output ends of the battery units 300 connected in parallel are sequentially connected with a first DC/AC circuit 800 and a boost circuit 900, output ends of the battery units 300 connected in series are connected with a second DC/AC circuit 1000, the control unit 600 controls the boost circuit 900 to serve as an output circuit for external loads before the switching time, and controls the second DC/AC circuit 1000 to serve as an output circuit for external loads after the switching time.
In this embodiment, in order to improve the energy conversion efficiency as a whole and reduce the energy loss, a modularized energy-storage bidirectional converter is provided. Unlike the conventional bidirectional converter, which uses serial output, the present application provides an improved operation mode capable of improving energy conversion efficiency, as described in the background art. In describing the operation of the modular energy-storing bidirectional converter, it is necessary to supplement the prior art to explain why the prior art does not use parallel output operation. It is known that the output voltage of the single battery cell 300 is only 15V, and if the single battery cell 300 is converted into a 220V voltage boosting circuit, the power consumption of the voltage boosting circuit is very high, and then, the plurality of battery cells 300 are connected in parallel, which means that the power consumption and the heat generation in the circuit are very high. Although the parallel output is not limited by the capacity of a single cell 300, its considerable energy loss is not negligible.
Under the above circumstances, the bidirectional converter for modularized energy storage provided in this embodiment performs a capacity test on all the battery cells 300 before use, and performs a discharge test by sequentially connecting the discharge load 400 to each battery cell 300, and the detection unit 500 and the discharge load 400 are synchronously connected to each battery cell 300 and perform voltage and current detection on each battery cell 300 in the discharging process of each battery cell 300, so as to determine half of the battery cells 300 and other half of the battery cells 300 with closer capacities. This is done because, as described in the background art, the batteries are not shipped uniformly by one manufacturer, and the uniformity of the batteries is difficult to be strictly controlled. After the battery units 300 are respectively calibrated into the main battery and the auxiliary battery through the capacity measurement test, the battery units 300 calibrated into the main battery are connected in series, and the battery units 300 calibrated into the auxiliary battery are connected in parallel, so that the battery units 300 can be output as two paths, wherein the main battery unit 300 has good consistency due to more strict screening, and is not easily limited by the capacity of the single battery unit 300. Next, half of the battery cells 300 remaining after the screening are output in parallel so as to be usable. Then, one group is connected with the first DC/AC circuit 800 and the boost circuit 900, and the other group is connected with the second DC/AC circuit 1000, and the switching time is used as a time node to enable the output of the first DC/AC circuit and the output of the second DC/AC circuit to be converted. For example, when the battery unit 300 is started to be used, the battery unit 300 is output through the first DC/AC circuit 800 and the boost circuit 900, and after a period of use, the battery unit 300 is output through the second DC/AC circuit 1000. Thus, the modularized energy storage bidirectional converter is free from the limitation of the capacity of the single battery unit 300, can have stable output for a longer time, and thus, the energy conversion efficiency is improved as a whole.
In one embodiment, the switching time of the bidirectional converter with modular energy storage is an interval time, and the switching time includes a first time node and a second time node, where the first time node is earlier than the second time node in time sequence, and the control unit 600 controls the series battery units 300 to be turned on to make the second DC/AC circuit 1000 as an output circuit to an external load, and the control unit 600 controls the parallel battery units 300 to be turned off to stop the boost circuit 900 as an output circuit to the external load.
In this embodiment, the switching time may be set as an interval time, and the switching time includes a first time node and a second time node, where the first time node is earlier in time sequence than the second time node, and the control unit 600 controls the series-connected battery cells 300 to be turned on to make the second DC/AC circuit 1000 an output circuit to an external load, and controls the parallel-connected battery cells 300 to be turned off to stop the boost circuit 900 as an output circuit to an external load. That is, there is no interruption between the two outputs.
In one embodiment, the switching time is configured after one actual lost capacity of the maximum capacity in the parallel cells 300 is over half. In addition, when the main battery and the auxiliary battery are calibrated, the control unit 600 eliminates the battery cell 300 having the maximum capacity and the battery cell 300 having the minimum capacity, and then screens the remaining battery cells 300 for calibration having the capacity close to that of the main battery.
In this embodiment, an embodiment of switching the switching time is provided, and an embodiment of screening the battery units 300 is also provided, in which after the maximum capacity and the minimum capacity are removed, the battery units 300 with the capacities closer to each other can be screened.
In one embodiment, as shown in fig. 4.
The modularized energy-storage bidirectional converter provided in this embodiment is characterized in that positive wires 1100 are connected between the positive poles of the battery units 300, negative wires 1200 are connected between the negative poles of the battery units 300, positive and negative wires 1300 are connected between the positive wires 1100 and the negative wires 1200 of adjacent battery units 300, the positive wires 1100 are separated from a first wire section 1400 and a second wire section 1500 by nodes of the positive and negative wires 1300, the negative wires 1200 are separated from a third wire section 1600 and a fourth wire section 1700, positive and negative parallel contactors 1800 are arranged on the first wire section 1400, negative and parallel contactors 1900 are arranged on the fourth wire section 1700, serial contactors 2000 are arranged on the positive and negative wires 1300, the positive wires 1100, the negative wires 1200, the positive and negative wires 1300, the positive and negative parallel contactors 1800, 1900 and the serial contactors 2000 are integrated on a connecting cover plate 2100, and the connecting cover plate 2100 is connected to the positive and negative poles of the adjacent battery units 300.
In the present embodiment, the parallel connection of the battery cells 300 and the series connection of the battery cells 300 are achieved by the control of the control unit 600, regardless of whether the battery cells are connected in series or in parallel. For example, if all the positive parallel contactor 1800 and the negative parallel contactor 1900 are controlled to be closed and the series contactor 2000 is opened, the connection modes of the battery cells 300 are parallel connection, and if all the series contactors 2000 are controlled to be closed and the positive parallel contactor 1800 and the negative parallel contactor 1900 are controlled to be opened, the connection modes of the battery cells 300 are series connection. Therefore, the connection mode can realize the parallel connection and series connection control switching. In a specific embodiment, since the robot transfer unit 700 is used to displace the battery cell 300 calibrated as the primary battery one place and the battery cell 300 calibrated as the secondary battery one another place, the wire will be greatly redirected in a conventional wiring manner. In the present embodiment, the positive electrode lead 1100, the negative electrode lead 1200, the positive electrode lead 1300, the positive electrode parallel contactor 1800, the negative electrode parallel contactor 1900, and the series contactor 2000 are integrated on a connection cover 2100, and the connection cover 2100 is connected to the positive electrode and the negative electrode of the adjacent battery cell 300. Therefore, no adjustment of the connection cap 2100 is required regardless of the movement of the respective battery cells 300, whether in series or in parallel after the movement, and all control is centrally controlled by the control unit 600. Simple operation and strong feasibility.
In a preferred embodiment, positive parallel contactor 1800, negative parallel contactor 1900, and series contactor 2000 are interlocked.
In a preferred embodiment, the positive and negative parallel contactors 1800 and 1900 are synchronously switched in response to a control signal from the control unit 600, and the series contactor 2000 is switched in response to a control signal from the control unit 600, so that both the cell 300, which is designated as a primary battery, and the cell 300, which is designated as a secondary battery, can be switched between series and parallel.
In one embodiment, as shown in fig. 5.
In the modularized energy storage bidirectional converter provided in this embodiment, before the battery unit 300 calibrated as the auxiliary battery is started, the control unit 600 controls the discharge load 400 and the detection unit 500 to access the battery units 300 calibrated as the main battery, so as to perform the discharge test on the battery units 300 as many times as the battery units 300, in each discharge process, calibrate the battery units 300 with insufficient capacity at first and provide auxiliary output voltage to the battery units, so that the battery units continue to participate in the next discharge test, meanwhile, the control unit 600 generates a time node for providing auxiliary output voltage, at the end of the last discharge test, the control unit 600 generates a time node for providing auxiliary output voltage to the battery units 300 with insufficient capacity at last, and takes the last time node as a reference time, generates a discharge time corresponding to each battery unit 300 one by one, the control unit 600 generates a capacity compensation amount corresponding to each battery unit 300 one according to the voltage and current data measured in the discharge test, both ends of each battery unit 300 connected in series are connected with a compensation capacitor, each compensation capacitor 2200 is configured according to the actual capacity of each compensation capacitor, after each battery unit 2200 is switched to each compensation unit 300 is switched to each compensation unit 2200, and the two compensation capacitors are switched off until the actual capacities reach the respective capacities 2200 are respectively connected in parallel, and reach the actual capacities 2200 after each battery unit 300 is switched off.
In this embodiment, in order to improve the output quality, i.e., the stability of the output voltage, in the primary output process, the capacity compensation is performed on each battery unit 300 one to one, so that the consistency of each battery unit 300 is the same, and the problem that the current bidirectional current transformer suffers from battery consistency is basically eliminated. In the first embodiment, the capacity compensation of each of the battery cells 300 connected in series is adaptively matched in the present embodiment in the operation mode in which the battery cells 300 connected in parallel are output prior to the battery cells 300 connected in series. The determination of the switching time is also embodied here, and the switching time is set up before after a sufficient compensation capacity is set up for the parallel battery cells 300. Specifically, before the battery unit 300 calibrated as the auxiliary battery is started, the control unit 600 controls the discharging load 400 and the detecting unit 500 to access the battery unit 300 calibrated as the main battery, so as to perform the discharging test on the battery unit 300 for the same number of times as the battery unit 300, during each discharging process, calibrate the battery unit 300 with the insufficient capacity at first and provide the auxiliary output voltage to the battery unit, so that the battery unit continues to participate in the discharging test for the next time, meanwhile, the control unit 600 generates a time node for providing the auxiliary output voltage, at the end of the last discharging test, the control unit 600 generates a time node for providing the auxiliary output voltage to the battery unit 300 with the insufficient capacity at last, and takes the last time node as the reference time, generates the discharging time corresponding to each battery unit 300 one by one, and the control unit 600 generates the capacity compensation amount corresponding to each battery unit 300 one by one according to each discharging time and the voltage and current data measured in the discharging test, and can determine the compensation amount required by each battery unit 300 through the discharging test for the same number of times as the battery unit 300. In fact, since the battery cells 300 have been subjected to a relatively strict screening, which is fifty percent of the primary battery cells 300, the capacity difference between the battery cells 300 is not large, and the capacity required to be compensated is relatively limited. In the manner of operation of the outputs of the parallel cells 300, only a small portion may be left for capacity compensation until the individual cells 300 are substantially consumed. In the mode of operation of the output of the series-connected battery cells 300, the individual battery cells 300 can be substantially simultaneously depleted. Through the above-mentioned operation mode, the switching time can be set before the parallel battery units 300 consume to only reserve the compensation capacity and be as close as possible, so that the screened parallel battery units 300 participate in the use in most of the time, and therefore, the energy conversion efficiency can be further improved. In addition, in the operation mode of the output of the battery cells 300 connected in series, since there is one-to-one compensation, the output voltage is stable and the output quality is high. Most importantly, the primary battery cells 300 are substantially synchronously consumed, and no overdischarge occurs. And correspondingly, no overcharge exists in the charging process. The service life is improved compared to the original series-connected battery cells 300.
The above-described embodiments are provided to further explain the objects, technical solutions, and advantageous effects of the present application in detail. It should be understood that the foregoing is only illustrative of the present application and is not intended to limit the scope of the present application. It should be noted that any modifications, equivalent substitutions, improvements, etc. made by those skilled in the art without departing from the spirit and principles of the present application are intended to be included in the scope of the present application.
Claims (10)
1. The bidirectional converter is characterized by comprising a plurality of battery units arranged on a battery rack cabin in an electric cabinet, wherein a discharge load, a detection unit and a control unit are also arranged in the electric cabinet, the discharge load is used for sequentially connecting each battery unit to carry out a discharge test, the detection unit and the discharge load are synchronously connected with each battery unit and are used for carrying out voltage and current detection on each battery unit in the discharging process of each battery unit, the control unit respectively marks half of the battery units with close measured capacity and the rest half of the battery units as a main battery and an auxiliary battery, and the manipulator unit is used for moving the battery units marked as the main battery to one place and moving the battery units marked as the auxiliary battery to the other place;
the control unit generates switching time according to capacity measurement test data of the battery units calibrated as auxiliary batteries, the switching time takes starting time of the battery units calibrated as auxiliary batteries as time zero point, the parallel battery unit output ends are sequentially connected with a first DC/AC circuit and a boost circuit, the serial battery unit output ends are connected with a second DC/AC circuit, the boost circuit is controlled to serve as an output circuit for external load before the switching time, and the second DC/AC circuit is controlled to serve as an output circuit for external load after the switching time.
2. The modular energy-storage bidirectional converter according to claim 1, wherein the switching time is an interval time, and the switching time includes a first time node and a second time node, the first time node being earlier in time sequence than the second time node, the control unit controlling the series-connected battery cells to be turned on to make the second DC/AC circuit as an output circuit to an external load, and the control unit controlling the parallel-connected battery cells to be turned off to stop the boost circuit as an output circuit to an external load.
3. The modular energy-storage bi-directional converter of claim 2, wherein the switching time is configured after one actual lost capacity of maximum capacity in the parallel cells is more than half.
4. The modular energy-storage bi-directional converter of claim 1, wherein the control unit, when calibrating the primary battery and the secondary battery, eliminates the battery cell with the maximum capacity and the battery cell with the minimum capacity, and then screens the remaining battery cells for calibration with the capacity close to that of the primary battery.
5. The modular energy-storage bidirectional converter according to claim 1, wherein positive wires are connected between positive poles of each battery unit, negative wires are connected between negative poles of each battery unit, positive and negative wires are connected between the positive and negative wires of adjacent battery units, nodes of the positive and negative wires divide the positive wires into a first wire section and a second wire section, the negative wires divide the negative wires into a third wire section and a fourth wire section, a positive parallel contactor is arranged on the first wire section, a negative parallel contactor is arranged on the fourth wire section, a series contactor is arranged on the positive and negative wires, and the positive wires, the negative wires, the positive and negative parallel contactors, and the series contactor are integrated on a connecting cover plate, and the connecting cover plate is connected between the positive and negative poles of adjacent battery units.
6. The modular energy storage bi-directional converter of claim 5 wherein the positive parallel contactor, the negative parallel contactor, and the series contactor are interlocked.
7. The modular energy-storage bi-directional converter of claim 5, wherein the positive and negative parallel contactors are synchronously switched in response to a control signal from the control unit, and the series contactor is synchronously switched in response to a control signal from the control unit, such that the battery cell, which is rated as a primary battery, and the battery cell, which is rated as a secondary battery, are each switchable between series and parallel.
8. The modular energy-storage bidirectional converter according to claim 1, wherein before the battery cell calibrated as an auxiliary battery is started, the control unit controls the discharge load and the detection unit to access the battery cells calibrated as main batteries, so as to perform a discharge test on the battery cells for the same number of times as the number of the battery cells, during each discharge process, calibrating the battery cells with insufficient capacity at first and providing auxiliary output voltage to the battery cells, so that the battery cells continue to participate in the next discharge test, while the control unit generates a time node providing auxiliary output voltage, at the end of the last discharge test, the control unit generates a time node providing auxiliary output voltage to the battery cells with insufficient capacity at the end of the last discharge test, and uses the last time node as a reference time, generates discharge times corresponding to the battery cells one by one between the last time node and each other time node, the control unit generates a compensation cell corresponding to the capacity of each battery cell according to the discharge time and voltage and current data measured in the discharge test, and configures the compensation cell with the capacity of each battery cell in series connection until the two compensation cells reach the actual capacity, and the two compensation cells are connected in parallel, and the capacity of each battery cell is switched according to the actual capacity.
9. The modular energy storage bi-directional converter of claim 8 wherein the compensation capacitor is a capacity adjustable capacitor.
10. The modular energy-storage bi-directional converter of claim 8, wherein the control unit causes the compensation capacitor to switch on the series of battery cells after the actual capacity reaches a configured value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310687615.5A CN116865316B (en) | 2023-06-12 | Modularized energy-storage bidirectional converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310687615.5A CN116865316B (en) | 2023-06-12 | Modularized energy-storage bidirectional converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116865316A true CN116865316A (en) | 2023-10-10 |
| CN116865316B CN116865316B (en) | 2024-10-25 |
Family
ID=
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106356554A (en) * | 2016-11-01 | 2017-01-25 | 深圳市鹏诚新能源科技有限公司 | Battery grouping method and device |
| CN109459698A (en) * | 2018-10-31 | 2019-03-12 | 淮安骏盛新能源科技有限公司 | A kind of battery grouping method of the correlation degree related coefficient based on mathematics |
| CN211579691U (en) * | 2020-04-23 | 2020-09-25 | 郑州阿格斯电子科技有限公司 | Interactive UPS control panel |
| DE102020123864A1 (en) * | 2020-09-14 | 2022-03-17 | Preh Gmbh | Method and device for actively balancing battery cells of multi-cell energy storage devices |
| CN115602949A (en) * | 2022-09-23 | 2023-01-13 | 广东邦普循环科技有限公司（Cn） | Screening method for gradient use of waste batteries |
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106356554A (en) * | 2016-11-01 | 2017-01-25 | 深圳市鹏诚新能源科技有限公司 | Battery grouping method and device |
| CN109459698A (en) * | 2018-10-31 | 2019-03-12 | 淮安骏盛新能源科技有限公司 | A kind of battery grouping method of the correlation degree related coefficient based on mathematics |
| CN211579691U (en) * | 2020-04-23 | 2020-09-25 | 郑州阿格斯电子科技有限公司 | Interactive UPS control panel |
| DE102020123864A1 (en) * | 2020-09-14 | 2022-03-17 | Preh Gmbh | Method and device for actively balancing battery cells of multi-cell energy storage devices |
| CN115602949A (en) * | 2022-09-23 | 2023-01-13 | 广东邦普循环科技有限公司（Cn） | Screening method for gradient use of waste batteries |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9231440B2 (en) | Power supply apparatus and controlling method of the same | |
| CN103094989B (en) | For managing method and the energy storage system of battery cell | |
| CN104184183B (en) | Battery management system and method of driving the same | |
| US8729860B2 (en) | Energy storage assembly and method for operating such an assembly | |
| Moo et al. | Parallel operation of battery power modules | |
| JP6332924B2 (en) | Cell balancing circuit and cell balancing method using the same | |
| US20130002026A1 (en) | Energy storage apparatus and energy storage system | |
| WO2012049915A1 (en) | Power management system | |
| US9583957B2 (en) | Cell balancing integrated circuit, cell balancing system, and cell balancing method | |
| US9035496B2 (en) | Power control system and controlling method thereof | |
| CN113270881A (en) | Energy storage system, balance control method of energy storage system and photovoltaic power generation system | |
| CN101828316A (en) | Automatic charge equalization method and apparatus for series connected battery string | |
| CN104247201A (en) | Power storage system and cartridge | |
| JP2013078242A (en) | Electric power supply device | |
| WO2022236545A1 (en) | Battery system and control method | |
| JP2009247108A (en) | Electric storage device and charging/discharging control method therefor | |
| CN216659649U (en) | Formation and capacitance circuit, equipment and system | |
| CN115833404A (en) | Energy storage system, uninterruptible power supply and battery balancing method | |
| KR102151652B1 (en) | Using Cuk Converter topology Li-ion battery cell balancing strategy | |
| KR20220025414A (en) | BATTERY APPARATUS and method for selecting battery pack | |
| JP2011188700A (en) | Power supply system, discharge control method, and discharge control program | |
| CN109274149B (en) | Electrical energy exchange device, battery device and battery maintenance system | |
| CN116865316B (en) | Modularized energy-storage bidirectional converter | |
| Nie et al. | Fast battery equalization with isolated bidirectional DC-DC converter for PHEV applications | |
| CN116865316A (en) | Modularized energy-storage bidirectional converter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant |