CN116388345B - Battery PACK circuit system and control method - Google Patents
Battery PACK circuit system and control method Download PDFInfo
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- CN116388345B CN116388345B CN202310641011.7A CN202310641011A CN116388345B CN 116388345 B CN116388345 B CN 116388345B CN 202310641011 A CN202310641011 A CN 202310641011A CN 116388345 B CN116388345 B CN 116388345B
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 22
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- 238000004146 energy storage Methods 0.000 claims description 19
- 238000002955 isolation Methods 0.000 claims description 8
- 230000005856 abnormality Effects 0.000 claims description 6
- 230000000903 blocking effect Effects 0.000 claims description 4
- 230000009191 jumping Effects 0.000 claims description 3
- 210000000352 storage cell Anatomy 0.000 claims description 3
- 230000002159 abnormal effect Effects 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 7
- 230000001105 regulatory effect Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 230000000875 corresponding effect Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- ZBOYJODMIAUJHH-SANMLTNESA-N (2s)-1-[[2,6-dimethoxy-4-[(2-methyl-3-phenylphenyl)methoxy]phenyl]methyl]piperidine-2-carboxylic acid Chemical group C=1C(OC)=C(CN2[C@@H](CCCC2)C(O)=O)C(OC)=CC=1OCC(C=1C)=CC=CC=1C1=CC=CC=C1 ZBOYJODMIAUJHH-SANMLTNESA-N 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 230000018109 developmental process Effects 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000012983 electrochemical energy storage Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
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- 230000007774 longterm Effects 0.000 description 1
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Classifications
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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
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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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
- H02J7/007—Regulation of charging or discharging current or voltage
-
- 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
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
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- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/325—Means for protecting converters other than automatic disconnection with means for allowing continuous operation despite a fault, i.e. fault tolerant converters
-
- 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
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
- H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
- H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
-
- 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
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
- H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
- H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
-
- 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
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
- H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
- H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1582—Buck-boost converters
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a battery PACK circuit system and a control method, wherein the battery PACK circuit system comprises a bidirectional DC-DC circuit, an ECO switch circuit and a bypass switch circuit; the bidirectional DC-DC circuit is respectively connected with the ECO switching circuit and the bypass switching circuit, and the ECO switching circuit is connected with the bypass switching circuit. A control method of the battery PACK circuit system is also disclosed. The battery PACK circuitry of the present invention: the system has a plurality of operation modes, can operate in a discharge boost mode, can operate in a buck cell module charging mode, and simultaneously has an ECO operation mode, so that the high-efficiency operation of the system is realized; in addition, the system can also operate in a bypass mode, so that the reliability of the system operation and the redundancy of abnormal states are further enhanced.
Description
Technical Field
The invention belongs to the technical field of electrochemical energy storage, and particularly relates to a battery PACK circuit system and a control method of the battery PACK circuit system.
Background
With the development of new energy power generation technology, the most effective method for solving the problems of wind abandoning and light abandoning is to apply an energy storage technology, and energy storage can effectively solve the space-time distribution of energy. However, because the voltage of the battery cell is low and the capacity is small, a large number of battery cell monomers need to be connected in series and parallel in application, and in the production of the battery cell, the consistency of the performance of each battery cell is difficult to ensure, and the working environments of each battery cell have different in the operation process of the battery cell, and the aging rates of the battery cells are different. The inconsistency of single electric core performance makes in same energy storage system, is difficult to guarantee that every battery state of charge is the same, and the open circuit voltage and the internal resistance of electric core all are correlated with electric core state of charge, when electric core state of charge inconsistent, can produce the circulation in battery PACK inside and each parallel battery PACK, further lead to battery energy storage system's charge-discharge cycle efficiency to reduce, the ageing of electric core has aggravated simultaneously for battery internal resistance increases, the loss increases, efficiency reduces, thereby reduced energy storage system's whole life-span.
Although the battery cells need to be screened at the beginning of the production of the PACK of the energy storage battery, and the battery cells with the open-circuit voltage consistent with the equivalent internal resistance of the battery are used in a classified manner, the differentiation of the parameters of the battery cells still occurs in the subsequent operation process, so that the inconsistency of the charge states of the battery is caused. For a high-power energy storage system, a plurality of battery PACKs are connected in series to form high voltage, and when an abnormality occurs to a certain battery PACKs, the series battery PACKs are led to integrally exit from operation, so that the reliability of the operation of the system is seriously affected.
The Chinese patent with application number 202211204986.5 discloses a battery system and a method with the functions of state balance and fault bypass among batteries, a half-bridge switch is adopted for each battery core, each battery core has the bypass function, ripple current of the half-bridge switch is injected into the battery core, so that the internal resistance and loss of the battery core are easily increased, the battery core is damaged after long-term application, a control system is complicated due to control of each battery core, the production process is complex, and the industrial application requirement is difficult to realize;
the patent application number 202110682357.2 discloses a modularized multi-level energy storage battery system, wherein power electronic half-bridge switches are connected in parallel at two ends of a battery core, the battery core is assembled by closing an upper pipe of the switch, a plurality of battery core modules are connected in series, closing a lower pipe of the switch, and the battery core is withdrawn.
The Chinese patent with application number 202020897366.4 discloses an MMHC energy storage converter, a battery core module is assembled in an H bridge circuit, a plurality of units are connected in series to form a high-voltage battery cluster structure, the positive electrode and the negative electrode of the battery cluster are connected in series to form another H bridge circuit, the output voltage of the battery core module can be regulated, the bidirectional charge and discharge requirements can be met, in addition, the voltage of the whole cluster can be regulated by the H bridge converter at the cluster level, but an abnormal withdrawal mode of a certain battery module cannot be realized, and if a certain battery module is abnormal, the whole cluster can only be withdrawn from operation.
Disclosure of Invention
The invention aims to provide a battery PACK circuit system, which solves the problem that an energy storage battery in the prior art cannot ensure that a high direct current bus voltage is maintained in a full charge-discharge time range, so that the application requirement of a power grid under a high voltage crossing working condition is met.
It is another object of the present invention to provide a control method of the above battery PACK circuitry.
The technical scheme adopted by the invention is that the battery PACK circuit system comprises a bidirectional DC-DC circuit, an ECO switch circuit and a bypass switch circuit; the bidirectional DC-DC circuit is respectively connected with the ECO switching circuit and the bypass switching circuit, and the ECO switching circuit is connected with the bypass switching circuit.
The present invention is also characterized in that,
the bidirectional DC-DC circuit comprises a battery module, a filter capacitor C1 and a filter capacitor C2, wherein the battery module is composed of n series energy storage cells, a positive connection point A of the battery module is connected with one end of an inductor L1, the other end of the inductor L1 is connected with a midpoint of series connection of a switch T1 and a switch T2, two ends of the filter capacitor C1 are respectively connected with two ends of the battery module in a bridging mode, two ends of the filter capacitor C2 are respectively connected between the switch T1 and the switch T2 in a bridging mode, the positive electrode of the filter capacitor C2 is a connection point B, and the negative electrode of the filter capacitor C2 is a connection point C.
The ECO switching circuit comprises a switch K1, and two ends of the switch K1 are respectively a connection point H and a connection point I; the bypass switch circuit comprises a switch T5 and a switch T6 which are connected in series, the switch T5 and the switch T6 form a half-bridge circuit, and the switch T6 is also connected with a switch K2 in parallel; two ends of the half-bridge circuit are respectively a connection point D and a connection point F, and the midpoint is a connection point E.
The positive electrode connection point A of the battery module is connected with the connection point H of the ECO switch circuit, and the positive electrode connection point B of the filter capacitor C2 is connected with the connection point D of the bypass switch circuit; the connection point I of the ECO switch circuit is connected with the connection point E of the bypass switch circuit; negative electrode connection point C and side of filter capacitor C2The connection point F of the path switching circuit is connected, and the bypass switching circuit outputs voltage Udc; the battery module also comprises a controller for collecting the side voltage U_battery, the output voltage Udc and the current I of the inductor L1 of the battery module L The driving signals PWM1, PWM2, PWM5 and PWM6 are output, and the driving signals PWM1, PWM2, PWM5 and PWM6 are amplified by the isolation driving unit in an isolation manner, and then the gate driving signals of the switches T1, T2, T5 and T6 are output correspondingly.
The other technical scheme adopted by the invention is that the control method of the battery PACK circuit system comprises the following steps:
step 1: the controller detects whether the side voltage U_battery of the battery module is larger than the threshold voltage A, if so, the step 2 is skipped, and if not, the step 3 is skipped;
step 2: the switches T1-T6 are blocked and run in an ECO working mode, whether the side voltage U_battery of the battery module is larger than the threshold voltage A or not is judged, if so, the battery module continues to run in the ECO mode, and if not, the battery module jumps to the step 3;
step 3: outputting stable direct current voltage in a bidirectional DC-DC circuit working mode, continuously judging whether the battery module side voltage U_battery is larger than the threshold voltage B, if so, continuously operating in the step 2, and if not, jumping to the step 4;
step 4: and (3) operating a bypass operation mode, blocking the switches T1-T5, enabling the controller to drive signals to the switch T6, enabling the switch T6 to be conducted, enabling the switch K2 to be closed, and blocking the signals to the switch T6 after the switch K2 is conducted.
The invention has the beneficial effects that
1. The battery PACK circuitry is provided with a redundant exit mode;
the battery PACK circuit system fails or can exit within the range of redundancy quantity according to the system operation requirement, the system operation is not affected, bus voltage interruption and abnormality are not generated in the exiting process, and the operation of a later-stage system and a load is not affected;
2. the battery PACK circuitry is provided with an ECO mode of operation;
when the series voltage of the battery core is higher, a threshold value is set, the switch K1 is closed, the DC-DC circuit can be withdrawn from operation, the operation loss of the system is reduced, and the operation efficiency is improved; in addition, when the DC-DC circuit fails in operation, the operation can be stopped, the switch K1 is closed, and the series battery cells are directly connected into operation;
3. the battery PACK circuitry is provided with a bypass mode of operation:
in the operation process, the battery core is abnormal, the switch T6 is turned on, the controller controls the switch K2 to be turned on, and after the switch K2 is turned on, the controller sends a switch T6 turn-off signal to turn off the switch T6, and due to the existence of the switch T6, the bypass is put into operation in ns level, so that the stability of the voltage of the direct current bus is ensured;
4. the battery PACK circuitry has high voltage ride through capability:
the battery PACK circuit system has a voltage stabilizing output function, and even if the discharge voltage of the battery is reduced, the internal bidirectional DC-DC circuit can stably output the voltage; in addition, under the condition that the power grid is subjected to high voltage ride through, the voltage of the bus is increased due to the regulated and stable output of the output voltage of the battery PACK, and the requirements of the subsequent stage normal operation are met.
Drawings
FIG. 1 is a block diagram of a bi-directional DC-DC circuit in a system of the present invention;
FIG. 2 is a block diagram of an ECO switch circuit in the system of the present invention;
FIG. 3 is a block diagram of a bypass switch circuit in the system of the present invention;
FIG. 4 is a block diagram of the battery PACK circuitry of the present invention;
FIG. 5 is a structural control diagram of the battery PACK circuitry of the present invention;
fig. 6 is a control logic diagram of the battery PACK circuitry of the present invention.
Detailed Description
The invention will be described in detail below with reference to the drawings and the detailed description.
The battery PACK circuit system comprises a bidirectional DC-DC circuit, an ECO switching circuit and a bypass switching circuit;
as shown in fig. 1, the bidirectional DC-DC circuit comprises a battery module composed of n series energy storage cells, the positive connection point a of the battery module is connected with one end of an inductor L1, the other end of the inductor L1 is connected with the midpoint of the series connection of a switch T1 and a switch T2, two ends of a filter capacitor C1 are respectively connected across two ends of the battery module, and the filter capacitor C1 can filter out ripple current of a high-frequency switch when the bidirectional DC-DC circuit topology is operated in BUCK charging, so that the increase of internal resistance and loss of the battery caused by the injection of ripple current of the high-frequency switch into the cells are avoided; the two ends of the filter capacitor C2 are respectively connected between the switch T1 and the switch T2 in a bridging way, the filter capacitor C2 can filter ripple current due to the high-frequency switch when the bidirectional DC-DC circuit topology operates in a discharging BOOST, and the influence of the ripple output of the high-frequency switch on the electric load and the device of the later stage is avoided, and the positive electrode connection point B of the filter capacitor C2 and the negative electrode connection point C of the filter capacitor C2 are connected;
the switches T1 and T2 are fully controlled power electronic switching devices, including, but not limited to MOSFET, IGBT, IGCT, and may be single tubes or a plurality of switch groups connected in parallel. In addition, the circuit can be in single-path or multi-path interleaving, and the corresponding number of the switch half-bridges and the corresponding number of the inductors are corresponding to the interleaving parallel connection number.
The ECO switch circuit, as shown in FIG. 2, comprises a switch K1, wherein two ends of the switch K1 are respectively a connection point H and a connection point I;
the switch K1 is a single switch or a switch group formed by connecting a plurality of switches in series and parallel; the switch K1 includes, but is not limited to, a contactor, a circuit breaker, a relay, IGBT, MOSFET, IGCT, and the like, and may be a switch group formed by connecting a mechanical switch and an electronic switch in series and parallel.
The bypass switch circuit, as shown in figure 3, comprises a switch T5 and a switch T6 which are connected in series, wherein the switch T5 and the switch T6 form a half-bridge circuit, and the switch T6 is also connected with a switch K2 in parallel; two ends of the half-bridge circuit are respectively a connection point D and a connection point F, and the midpoint is a connection point E;
the switch T5 and the switch T6 are full-control power electronic switching devices, including but not limited to MOSFET, IGBT, IGCT, and can be single tubes or switch groups with a plurality of switches connected in parallel; the switch K2 is a mechanical switch or a power electronic switch, and can be a single switch or a switch group formed by connecting a plurality of switches in series and parallel.
Because there is voltage at both ends of filter capacitor C1, so under the bypass operation mode, switch T5 opens, switch T6 is full-control power electronic switch, and the action time of switch is in ns level, can realize fast action, avoids the switch action device to lead to the interruption of later stage circuit voltage, and parallelly connected switch K2 with switch T6 is mechanical switch, has better current capacity, and mechanical switch action time is long, so switch T6 and switch K2 parallelly connected not only have satisfied current capacity, also satisfy the shorter requirement of switching action time.
As shown in fig. 4, the positive electrode connection point a of the battery module is connected with the connection point H of the ECO switch circuit, and the positive electrode connection point B of the filter capacitor C2 is connected with the connection point D of the bypass switch circuit; the connection point I of the ECO switch circuit is connected with the connection point E of the bypass switch circuit; the negative electrode connection point C of the filter capacitor C2 is connected with the connection point F of the bypass switch circuit; the connection point E and the connection point F of the bypass switch circuit are the output DC+ and DC-of the multi-mode battery PACK circuit system;
FIG. 5 is a control structure diagram of a multi-mode battery PACK circuit system, wherein a controller collects a battery module side voltage U_battery, an output voltage Udc, and a current I of an inductor L1 L The driving signals PWM1, PWM2, PWM5 and PWM6 are output, and the driving signals PWM1, PWM2, PWM5 and PWM6 are amplified by the isolation driving unit in an isolation manner and then the gate driving signals of the switches T1-T2 and T5-T6 are correspondingly output.
The controller is externally provided with a communication interface, can interact external communication information, uploads the running state and running data of the multi-mode battery PACK to an external data monitoring platform, and can also receive an issuing instruction of the external data monitoring platform, wherein the issuing instruction is not limited to the interactive communication of running mode, running data, running state and other data, and the BMS-1 unit is used for controlling and managing the balance of the battery cells and the running data of the battery cells by communicating the acquired temperature and voltage data of each battery cell with the BMS system.
The model of the controller is GD32F407VET6, the cost performance of the controller is high, and the controller contains various external interfaces, and has rich computing capability and computing resources. The battery module voltage U_battery, the output voltage Udc and the inductance current are collected, closed-loop control is carried out according to the charge-discharge state and the operation mode of the DC/DC converter, control signals PWM1, PWM2, PWM5 and PWM6 of switches T1-T2 and T5-T6 are output to an isolation driving unit, the isolation driving unit carries out isolation amplification on the driving signals, PWM1, PWM2, PWM5 and PWM6 driving signals are output, two tubes (PWM 1 and PWM2 or PWM5 and PWM 6) of the same bridge arm contain dead zones, and if the two tubes are of a staggered parallel structure, drive signal phase-shifting among the bridge arms is realized through a timer.
The battery PACK circuit system comprises a BUCK-BOOST bidirectional converter which operates in a BOOST mode, the electricity storage battery module is used for providing electric energy for external discharge, the energy flow is an electric energy circulation path from the energy storage battery module, the inductor L1, the switch T3 and the switch T5, the BOOST mode is boosting operation, the output voltage can be higher than the open-circuit voltage value of the energy storage battery module, the output voltage can be ensured to be higher under the condition that the voltage of the end of the battery module is reduced (the voltage can be regulated and controlled according to the system requirement), so that the system can well carry out voltage support under the condition that the power grid is subjected to high-voltage crossing, and the requirement is met. The BOOST mode can work in a constant power mode, a constant voltage mode, a constant current mode and other working modes, and the working modes can be controlled and selected according to the system requirements.
The battery PACK circuit system comprises a BUCK-BOOST bidirectional converter which operates in a BUCK mode, the energy storage battery module is charged by the outside to provide electric energy, the energy flow is from the outside to the energy storage battery module through a switch T5, a switch T1 and an inductor L1, the BUCK mode is in step-down operation, the input voltage of a battery core can be lower than the voltage of an external power supply, the BUCK mode can work in a constant-power mode, a constant-voltage mode, a constant-current mode and other working modes, and the working mode can be controlled and selected according to the system requirement.
Battery PACK circuitry, operating mode logic as shown in fig. 6, steps are as follows:
step 1: the controller detects whether the battery module voltage U_battery is larger than a threshold voltage A (the general value is the number of battery cells of the battery cell module multiplied by the rated voltage of the single battery cell), if the battery module voltage U_battery is larger than the threshold voltage A, the step 2 is skipped, and if the battery module voltage U_battery is not larger than the threshold voltage A, the step 3 is skipped;
step 2: the switches T1-T6 of the multi-mode battery PACK circuit system are blocked, the battery is operated in an ECO working mode, whether the battery voltage is larger than a threshold voltage A or not is judged, if the battery voltage is larger than the threshold voltage A, the battery is operated in the ECO mode continuously, and if the battery voltage is not larger than the threshold voltage A, the step 3 is skipped;
step 3: outputting stable direct current voltage in a bidirectional DC-DC circuit working mode, continuously judging whether the voltage of the battery module is larger than a threshold voltage B (the value is generally the number of battery cells of the battery cell module multiplied by the lower limit cut-off voltage of the single battery cell), if so, continuously operating in the step 2, and if not, jumping to the step 4;
step 4: the control device operates in a bypass operation mode, blocks the switches T1-T5, drives signals to the switch T6 by the controller, enables the switch T6 to be conducted, simultaneously provides a closing signal to the switch K2, locks the signals to the switch T6 after the switch K2 is conducted, and turns off the switch;
if the battery cell voltage, the SOC and the temperature information are detected in the ECO operation mode, if the battery cell abnormality exists or an upper scheduling system is received, the operation mode is converted into a bypass operation mode, and then the step is executed, namely, the step is skipped to step 4;
if the DC/DC operation abnormality is detected or the upper scheduling system is received to switch the operation mode to the bypass operation mode when the bidirectional DC-DC circuit operation mode is detected, the step is executed, namely, the step is skipped to step 4.
The battery PACK circuitry of the present invention: the device has a plurality of operation modes, and can operate in a discharge boost mode; the system can operate in a buck battery cell module charging mode, and simultaneously has an ECO operation mode, so that the high-efficiency operation of the system is realized, and meanwhile, the reliability of the system (aiming at abnormal exit of the DC-DC converter) is enhanced by the mode; in addition, the system can also operate in a bypass mode, so that the reliability of system operation and the redundancy of abnormal states are further enhanced, and the high-efficiency conversion of the energy storage system and the safe and reliable operation are realized.
The invention is applied to other similar or same occasions such as energy storage systems, new energy power generation and the like, not only realizes bidirectional BUCK-BOOST conversion, but also realizes that various operation modes meet various application requirements, has fault redundancy, and improves the reliability of the system.
Claims (3)
1. The battery PACK circuit system is characterized by comprising a bidirectional DC-DC circuit, an ECO switching circuit and a bypass switching circuit; the bidirectional DC-DC circuit is respectively connected with the ECO switching circuit and the bypass switching circuit, and the ECO switching circuit is connected with the bypass switching circuit;
the bidirectional DC-DC circuit comprises a battery module, a filter capacitor C1 and a filter capacitor C2, wherein the battery module is formed by n series energy storage cells, a positive electrode connecting point A of the battery module is connected with one end of an inductor L1, the other end of the inductor L1 is connected with a series midpoint of a switch T1 and a switch T2, two ends of the filter capacitor C1 are respectively connected with two ends of the battery module in a bridging manner, two ends of the filter capacitor C2 are respectively connected between the switch T1 and the switch T2 in a bridging manner, the positive electrode of the filter capacitor C2 is a connecting point B, and the negative electrode of the filter capacitor C2 is a connecting point C;
the ECO switch circuit comprises a switch K1, wherein two ends of the switch K1 are respectively a connection point H and a connection point I; the bypass switch circuit comprises a switch T5 and a switch T6 which are connected in series, wherein the switch T5 and the switch T6 form a half-bridge circuit, and the switch T6 is also connected with a switch K2 in parallel; two ends of the half-bridge circuit are respectively a connection point D and a connection point F, and the midpoint is a connection point E; the positive electrode connection point A of the battery module is connected with the connection point H of the ECO switch circuit, and the positive electrode connection point B of the filter capacitor C2 is connected with the connection point D of the bypass switch circuit; the connection point I of the ECO switch circuit is connected with the connection point E of the bypass switch circuit; the negative electrode connection point C of the filter capacitor C2 is connected with the connection point F of a bypass switch circuit, and the bypass switch circuit outputs voltage Udc; the battery module also comprises a controller, wherein the controller is used for collecting the side voltage U_battery, the output voltage Udc and the current I of the inductor L1 of the battery module L Output driving signals pwm1, pwm2, pwm5, pwm6, are outputted to the driving unit through the isolation driving unitThe drive signals PWM1, PWM2, PWM5 and PWM6 are isolated and amplified, and then the isolated drive signals PWM1, PWM2, PWM5 and PWM6 are output correspondingly, and the gate drive signals of the switches T1, T2, T5 and T6 are output correspondingly.
2. A method for controlling a battery PACK circuit system according to claim 1, comprising the steps of:
step 1: the controller detects whether the side voltage U_battery of the battery module is larger than the threshold voltage A, if so, the step 2 is skipped, and if not, the step 3 is skipped;
step 2: the switches T1-T6 are blocked and run in an ECO working mode, whether the side voltage U_battery of the battery module is larger than the threshold voltage A or not is judged, if so, the battery module continues to run in the ECO mode, and if not, the battery module jumps to the step 3;
step 3: outputting stable direct current voltage in a bidirectional DC-DC circuit working mode, continuously judging whether the battery module side voltage U_battery is larger than the threshold voltage B, if so, continuously operating in the step 2, and if not, jumping to the step 4;
step 4: and (3) operating a bypass operation mode, blocking the switches T1-T5, enabling the controller to drive signals to the switch T6, enabling the switch T6 to be conducted, enabling the switch K2 to be closed, and blocking the signals to the switch T6 after the switch K2 is conducted.
3. The control method of battery PACK circuitry according to claim 2, wherein if in the ECO-run mode, the cell voltage, SOC, temperature information is detected, if there is a cell abnormality or an upper scheduling system is received, the ECO-run mode is converted to the bypass run mode, i.e. the step 4 is skipped; if the DC/DC operation abnormality is detected or the upper scheduling system is received in the bidirectional DC-DC circuit operation mode, the operation mode is converted into the bypass operation mode, namely, the step 4 is skipped.
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| CN117458562B (en) * | 2023-10-26 | 2024-08-30 | 西安为光能源科技有限公司 | High-voltage direct-hanging type power electronic battery PACK circuit system and control method |
| CN117913961B (en) * | 2024-03-19 | 2024-05-14 | 长峡数字能源科技(湖北)有限公司 | Energy storage circuit system and working mode switching method thereof |
| CN120033816B (en) * | 2025-04-21 | 2025-08-12 | 杭州经纬信息技术股份有限公司 | Storage battery open-circuit protection circuit and failure early warning protection system thereof |
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