CN116388316A - Battery management device and charging device - Google Patents
Battery management device and charging device Download PDFInfo
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- CN116388316A CN116388316A CN202211679571.3A CN202211679571A CN116388316A CN 116388316 A CN116388316 A CN 116388316A CN 202211679571 A CN202211679571 A CN 202211679571A CN 116388316 A CN116388316 A CN 116388316A
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- 230000002457 bidirectional effect Effects 0.000 description 13
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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
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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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
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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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
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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
- H02M1/12—Arrangements for reducing harmonics from ac input or output
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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
- H02M1/12—Arrangements for reducing harmonics from ac input or output
- H02M1/123—Suppression of common mode voltage or current
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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
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Abstract
The invention discloses battery management equipment and a charging device, wherein the battery management equipment comprises at least one battery pack management unit, and each battery pack corresponds to one battery pack management unit; the battery pack management unit comprises a common mode suppression circuit, a first power module and a first control module which are electrically connected in sequence, wherein the common mode suppression circuit is electrically connected with an external alternating current power supply; the common mode rejection circuit comprises a plurality of isolation transformers; the first power supply module is used for supplying power to the first control module; the common mode rejection circuit is used for blocking common mode current formed in the corresponding circuit in the process of supplying power to the first control module by the first power module. According to the invention, the common mode suppression circuit is additionally arranged in the battery monitoring equipment, for example, the isolation transformer is additionally arranged at the AC power supply inlet, so that the common mode current formed in the corresponding circuit is blocked in time in the process that the first power supply module supplies power to the first control module, and a good common mode suppression effect is achieved.
Description
The present application claims priority from chinese patent application CN2021116592396 with application date 2021/12/30. The present application refers to the entirety of the above-mentioned chinese patent application.
Technical Field
The present invention relates to the field of battery management technologies, and in particular, to a battery management device and a charging apparatus.
Background
In an electric automobile power exchange station, most of battery charging is carried out in the same way as a conventional charging pile, the topology structure is based on Vienna rectification/PFC (power factor correction) and is combined with unidirectional isolation DC/DC (direct current to direct current), the circuit has no requirement on the grounding form of a front-stage transformer, and the circuit has strong applicability to vehicles and power grids; however, the mode has the defects of lower efficiency, complex structure and the like, and is limited by a topological structure, and the mode can only realize unidirectional flow of power, namely can charge an automobile battery through a power grid, but cannot realize bidirectional flow or can transfer electric quantity from the battery to the power grid. Under the circuit structure, if bidirectional charging is to be realized, besides the prior-stage Vienna rectification is to be changed into bidirectional PWM (pulse width modulation) rectification, the DC/DC of the rear end is also required to be changed into bidirectional, and the number of control devices in the existing improved circuit structure is greatly increased, so that the cost is increased in multiple.
Disclosure of Invention
The invention aims to overcome the defects that a charging device in the prior art cannot be charged bidirectionally or has a complex circuit structure, high cost and the like, and aims to provide battery management equipment and the charging device.
The invention solves the technical problems by the following technical scheme:
the invention provides battery management equipment, which is applied to a power exchange station or an energy storage station, and comprises at least one battery pack management unit, wherein each battery pack corresponds to one battery pack management unit;
the battery pack management unit comprises a common mode suppression circuit, a first power supply module and a first control module which are electrically connected in sequence, wherein the common mode suppression circuit is electrically connected with an external alternating current power supply;
the common mode rejection circuit comprises a plurality of isolation transformers;
the first power supply module is used for supplying power to the first control module;
the common mode rejection circuit is used for blocking common mode current formed in the corresponding circuit in the process of supplying power to the first control module by the first power module.
In the scheme, the common mode suppression circuit is additionally arranged in the battery management equipment, for example, a plurality of isolation transformers are additionally arranged at an AC power supply inlet, so that common mode currents formed in corresponding circuits are blocked in time in the process that the first power supply module supplies power to the first control module, a good common mode suppression effect is achieved, interference influence of the common mode currents on the circuits or other devices is avoided, and timeliness, rationality and effectiveness of control and management of each battery pack are ensured when each battery pack is independently powered.
Preferably, when the common mode rejection circuit includes a plurality of the isolation transformers, the plurality of the isolation transformers are connected in the following manner:
all in series, all in parallel, or some in series and the remainder in parallel.
In the scheme, a plurality of isolation transformers can be connected in series, in parallel or in parallel partially in series so as to meet the design requirements of different circuit structures. The specific connection mode and the specific number of the isolation transformers can be designed or adjusted according to actual requirements; the battery management system can be flexibly designed and adjusted according to different actual requirements, and can meet battery management scenes with higher requirements.
Preferably, the first control module includes a charge controller and a BMS battery management module;
the first power supply module comprises a first power supply unit and a second power supply unit;
the first power supply unit is electrically connected with the charging controller and is used for providing a first set direct-current voltage for the charging controller;
the second power supply unit is electrically connected with the BMS (battery management system) battery management module, and is used for providing a second set direct current voltage to the BMS battery management module.
In this scheme, set up corresponding power supply unit respectively to charge controller and BMS battery management module, when realizing the independent power supply to every battery, satisfy charge controller and BMS battery management module's the charging requirement of the respective corresponding settlement direct voltage of each, and guaranteed rationality and the security of charging.
Preferably, the first power supply unit is a first rectifier, and the second power supply unit is a second rectifier;
the input end of the common mode rejection circuit is electrically connected with the external alternating current power supply, the output end of the common mode rejection circuit is electrically connected with the input end of the first rectifier, and the first rectifier is used for converting the alternating current voltage output by the common mode rejection circuit into the first set direct current voltage and supplying power to the charging controller by adopting the first set direct current voltage;
the input end of the second rectifier is electrically connected with the output end of the common mode rejection circuit, and the second rectifier is used for converting the alternating voltage output by the common mode rejection circuit into the second set direct voltage and supplying power to the BMS battery management module by adopting the second set direct voltage.
In the scheme, the common mode suppression circuit is arranged on the main circuit of the direct and external alternating current power supply, so that the common mode current formed in the common mode suppression circuit is blocked in time by adopting the common mode suppression circuit in the process that the direct current voltage converter supplies power to the BMS battery management module, and the effect of timely suppression is achieved.
Preferably, the battery pack management unit further comprises a reset switch;
the reset switch is electrically connected between the second power supply unit and the BMS battery management module, and is electrically connected with the charge controller.
In the scheme, the reset switch is used for executing reset operation under set conditions, such as timely reset when abnormal conditions occur, so that the circuit is restored to a normal running state, and the stability of the charging process is ensured.
The invention also provides a charging device which comprises the battery management equipment.
Preferably, the charging device further comprises a background service device and a charger which is respectively in communication connection with the background service device and the battery management equipment.
In the scheme, the battery management equipment is integrated in the charging device, the charging device is built through the battery management equipment, the charger and the background service device provided with the common mode suppression loop, so that the timely and effective suppression of the common mode current in the corresponding circuit in the bidirectional charging process of the battery pack is ensured, and the overall operation performance and efficiency of the charging device are effectively improved.
Preferably, the background service device is provided with a common mode rejection loop in an integrated way.
Preferably, the common mode rejection loop comprises a differential operational amplifier circuit, a magnetic isolation amplifier, a common mode magnetic loop or an optocoupler isolation.
In the scheme, the common mode suppression loop is arranged in the background service device, so that the suppression effect of the common mode current in the corresponding circuit in the bidirectional charging process of the battery pack is further ensured, and the overall operation performance and efficiency of the charging device are effectively improved.
Preferably, the charger comprises a rectifying unit, a second control module, a plurality of second power modules and battery packs, wherein each battery pack corresponds to one second power module;
the input end of the rectifying unit is electrically connected with an external alternating current power supply, the output end of the second power supply module is electrically connected with the positive electrode of the corresponding battery pack, and the output end of the rectifying unit, the input end of each second power supply module and the negative electrode of the corresponding battery pack are all connected to a public direct current bus;
the rectification unit is used for rectifying the externally input alternating voltage to obtain rectified voltage, and outputting the rectified voltage to the public direct current bus;
the second power supply module is used for acquiring the rectification voltage from the public direct current bus, converting the rectification voltage into a third set direct current voltage, and supplying power to the corresponding battery pack by adopting the third set direct current voltage;
the second control module is used for generating a first trigger instruction and sending the first trigger instruction to the second power module after receiving an external reverse power transmission instruction;
the second control module is used for generating a second trigger instruction and sending the second trigger instruction to the rectifying unit when the external inverted power transmission instruction is received and all the battery packs on the same public direct current bus are determined to be in a discharging state;
the second power supply module is used for entering a reverse discharge state according to the first trigger instruction, and the rectifying unit is used for adjusting a power angle to a set position according to the second trigger instruction so as to switch the charger from the rectifying state to the inversion state.
In this scheme, through the circuit improvement design to the machine that charges, can support two-way charging function, can be to the automatic, nimble and the accurate switching control of battery package two-way charging, promoted charging device's whole running performance and efficiency effectively.
Preferably, the rectifying unit is an AC/DC (alternating current to direct current) voltage converter;
the AC/DC voltage converter adopts a PWM rectification mode, a 24-pulse rectification mode or a rectification mode combining Vienna rectification and PFC rectification.
Preferably, the second control module is configured to obtain a fault parameter reported by the battery management device; the fault parameters comprise fault types and occurrence times corresponding to the fault types;
and the second control module is also used for determining that electromagnetic interference occurs between the battery management equipment and the charger when the occurrence times corresponding to the same fault type meet the preset condition within the set time length, generating a third trigger instruction and sending the third trigger instruction to the battery management equipment so as to drive the battery management equipment to be powered off or reset.
In the scheme, the reported fault data are analyzed in time, whether electromagnetic interference occurs between the battery management equipment and the charger is determined in time, and the operation of power-off or power-on reset is performed in time when the electromagnetic interference occurs is determined, so that the circuit can be ensured to recover to a normal working state, and the stability, reliability and effectiveness of independent power supply to each battery pack can be ensured.
Preferably, the second power module is a non-isolated DC/DC converter.
Preferably, the power tube of the second power module is a silicon carbide MOS tube (metal-oxide semiconductor field effect transistor).
In this scheme, second power module adopts carborundum MOS pipe (SiC MOSFET) as the power tube, compares with traditional silicon MOS pipe (Si MOSFET), and on resistance, the switching loss of carborundum MOS pipe all reduce by a wide margin, can be applicable to higher operating frequency, and has better high temperature stability.
On the basis of conforming to the common knowledge in the field, the preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the invention.
The invention has the positive progress effects that:
in the invention, the common mode suppression circuit is additionally arranged in the battery management equipment, for example, an isolation transformer is additionally arranged at the inlet of the alternating current power supply, so that the common mode current formed in the corresponding circuit is blocked in time in the process of supplying power to the first control module by the first power supply module, a good common mode suppression effect is achieved, the interference influence of the common mode current on the circuit or other devices is avoided, and the timeliness, the rationality and the effectiveness of the control management of each battery pack are ensured when each battery pack is independently supplied with power. In addition, the battery management equipment is integrated in the charging device, and the charging device is built through the battery management equipment, a charger and a background service device provided with a common mode suppression loop, so that the timely and effective suppression of the common mode current in a corresponding circuit in the bidirectional charging process of the battery pack is ensured; meanwhile, through the improved circuit design of the charger, the bidirectional charging function can be supported, and the circuit has the advantages of simple structure, low cost and high efficiency, and the overall operation performance and efficiency of the charging device are effectively improved.
Drawings
Fig. 1 is a schematic configuration diagram of a battery management device of embodiment 1 of the present invention.
Fig. 2 is a first structural schematic diagram of a battery pack management unit according to embodiment 2 of the present invention.
Fig. 3 is a second structural schematic diagram of a battery pack management unit according to embodiment 2 of the present invention.
Fig. 4 is a first schematic structural diagram of a charging device according to embodiment 3 of the present invention.
Fig. 5 is a second schematic structural diagram of the charging device according to embodiment 3 of the present invention.
Fig. 6 is a third schematic structural diagram of a charging device according to embodiment 3 of the present invention.
Detailed Description
The invention is further illustrated by means of the following examples, which are not intended to limit the scope of the invention.
Example 1
The battery management device in this embodiment is applied in a power exchange station or an energy storage station.
As shown in fig. 1, the battery management apparatus 1 in the present embodiment includes at least one battery pack management unit 2, one battery pack management unit 2 for each battery pack.
The battery pack management unit 2 comprises a common mode rejection circuit 3, a first power supply module 4 and a first control module 5 which are electrically connected in sequence, wherein the common mode rejection circuit 3 is electrically connected with an external alternating current power supply;
the common mode rejection circuit 3 comprises a plurality of isolation transformers 6;
the first power module 4 is used for supplying power to the first control module 5;
the common mode rejection circuit 3 is configured to block a common mode current formed in a corresponding circuit during power supply from the first power module 4 to the first control module 5.
In this embodiment, a common mode suppression circuit is added to the battery management device, for example, a plurality of isolation transformers are added to an ac power inlet, so that in a process of supplying power to the first control module by the first power module, common mode currents formed in corresponding circuits are blocked in time, a good common mode suppression effect is achieved, interference influence of the common mode currents on the circuits or other devices is avoided, and timeliness, rationality and effectiveness of control and management on each battery pack are ensured when each battery pack is independently powered.
Example 2
The battery management apparatus 1 in the present embodiment is a further improvement of embodiment 1, specifically:
in an embodiment, when the common mode rejection circuit 3 includes a plurality of isolation transformers 6, the plurality of isolation transformers 6 are connected as follows:
all in series, all in parallel, or some in series and the remainder in parallel.
The isolation transformers can be all connected in series, all connected in parallel, or part of the series connection parts are connected in parallel so as to meet the design requirements of different circuit structures. The specific connection mode and the specific number of the isolation transformers can be designed or adjusted according to actual requirements; the battery management system can be flexibly designed and adjusted according to different actual requirements, and can meet battery management scenes with higher requirements.
When the common mode rejection circuit 3 corresponds to one isolation transformer 6, the effect of blocking common mode current formed in the corresponding circuit can be achieved, meanwhile, the hardware cost investment is low, and the circuit structure is relatively simplified;
when the common mode rejection circuit 3 corresponds to the plurality of isolation transformers 6, the effect of blocking the common mode current formed in the corresponding circuit more comprehensively, more timely and more effectively can be achieved, and at the moment, the hardware cost investment is relatively high, and the circuit structure is relatively complex.
The common mode rejection circuit can be designed, configured or adjusted according to actual requirements.
In one embodiment, as shown in fig. 2 and 3, the first control module 5 includes a charge controller 7 and a BMS battery management module 8;
the first power supply module 4 includes a first power supply unit 9 and a second power supply unit 10;
the first power supply unit 9 is electrically connected with the charging controller 7, and the first power supply unit 9 is used for providing a first set direct current voltage to the charging controller 7;
the second power supply unit 10 is electrically connected to the BMS battery management module 8, and the second power supply unit 10 is configured to provide a second set dc voltage to the BMS battery management module 8.
Corresponding power supply units are respectively arranged on the charging controller and the BMS battery management module, independent power supply to each battery is achieved, charging requirements of the charging controller and the BMS battery management module for setting direct-current voltage are met, and charging rationality and charging safety are guaranteed.
In an embodiment, the first power supply unit 9 is a first rectifier, and the second power supply unit 10 is a second rectifier;
the input end of the common mode rejection circuit 3 is electrically connected with an external alternating current power supply, the output end of the common mode rejection circuit 3 is electrically connected with the input end of a first rectifier, and the first rectifier is used for converting the alternating current voltage output by the common mode rejection circuit 3 into a first set direct current voltage and supplying power to the charging controller 7 by adopting the first set direct current voltage;
the input end of the second rectifier is electrically connected to the output end of the common mode rejection circuit 3, and the second rectifier is used for converting the ac voltage output by the common mode rejection circuit 3 into a second set dc voltage and supplying power to the BMS battery management module 8 by using the second set dc voltage.
Specifically, the first rectifier and the second rectifier are both AC/DC converters, and the first rectifier outputs 24V direct current voltage to be output to the charging controller; the second rectifier outputs a 12V dc voltage to output to the BMS battery management module.
The common mode suppression circuit 3 is arranged on a main circuit of the direct and external alternating current power supply, so that the common mode current formed in the common mode suppression circuit is blocked in time by adopting the common mode suppression circuit in the process of supplying power to the BMS battery management module by the direct current voltage converter, and the effect of suppressing in time is achieved.
In an embodiment, the battery pack management unit 2 further includes a reset switch 11;
the reset switch 11 is electrically connected between the second power supply unit 10 and the BMS battery management module 8, and is electrically connected with the charge controller 7.
The reset switch 11 is used for performing a reset operation under a set condition, such as timely resetting to restore the circuit to a normal operation state when an abnormal condition occurs, so as to ensure the stability of the charging process.
In this embodiment, a common mode suppression circuit is added in the battery management device, for example, a plurality of isolation transformers are arranged at an ac power inlet, so that in the process of supplying power to the first control module by the first power module, common mode currents formed in corresponding circuits are blocked in time, a good common mode suppression effect is achieved, interference influence of the common mode currents on the circuits or other devices is avoided, and timeliness, rationality and effectiveness of control and management on each battery pack are ensured when each battery pack is independently powered.
Example 3
As shown in fig. 4, 5 and 6, the charging device of the present embodiment includes the battery management apparatus 1 (corresponding to the secondary side in fig. 5) in embodiment 1 or 2, and further includes the background service device 12, and the charger 13 (corresponding to the primary side in fig. 5) communicatively connected to the background service device 12 and the battery management apparatus 1, respectively.
The background service device 12 is provided with a common mode rejection circuit 14.
Specifically, common mode rejection loop 14 includes, but is not limited to, differential operational amplifier circuitry, magnetically isolated amplifiers, common mode magnetic loops, or optocoupler isolation.
In an embodiment, the charger 13 includes a rectifying unit 15, a second control module 16, a plurality of second power modules 17, and a battery pack 18, where each battery pack 18 corresponds to one second power module 17, and the plurality of second power modules 17 are connected in parallel.
Wherein, the input end of the rectifying unit 15 is electrically connected with an external alternating current power supply (A in FIG. 6), the output end of the second power supply module 17 is electrically connected with the positive electrode of the corresponding battery pack 18, and the output end of the rectifying unit 15, the input end of each second power supply module 17 and the negative electrode of the corresponding battery pack 18 are all connected to a common direct current bus (B in FIG. 6); in addition, each branch circuit in fig. 6 corresponds to one battery pack 18, and the charging port of each battery pack 18 is electrically connected to the common dc bus, and how the charging port of a specific battery pack is disposed on the common dc bus may be connected according to actual design requirements.
The rectifying unit 15 is configured to rectify an externally input ac voltage to obtain a rectified voltage, and output the rectified voltage to a common dc bus; the second power module 17 is configured to obtain a rectified voltage from the common dc bus, convert the rectified voltage into a third set dc voltage, and supply power to the corresponding battery pack 18 using the third set dc voltage;
the second control module 16 is configured to generate a first trigger instruction and send the first trigger instruction to the second power module 17 after receiving an external power back-off instruction;
the second control module 16 is configured to generate a second trigger instruction and send the second trigger instruction to the rectifying unit 15 when receiving an external inverted power transmission instruction and determining that all the battery packs 18 on the same common dc bus are in a discharge state;
the second power module 17 is configured to enter a reverse discharge state according to the first trigger instruction, and the rectifying unit 15 is configured to adjust a power angle to a set position according to the second trigger instruction, so as to switch the charger 13 from the rectifying state to the inverting state.
Specifically, the second power module 17 is a non-isolated DC/DC, for example, converting an input voltage of 800V to a direct voltage of less than 750V; the rectifying unit 15 is an AC/DC voltage converter, which may employ: a PWM rectification method, a 24-pulse rectification method, or a rectification method in which vienna rectification and PFC rectification are combined.
When the power supply is powered in the forward direction, the rectifying unit at the front end is used for stabilizing the voltage in the public direct current bus, the second power supply module at the rear end operates in a constant current mode, and is used for providing proper charging current for the battery according to the requirements of the BMS and the battery replacement station control system; when the second power supply module is controlled to reversely supply energy, the rectifier adjusts the power angle to be negative according to the control instruction, so that the circuit function enters the inversion state from the rectification state, the circuit improvement design of the charger is realized, the bidirectional charging function is supported, and the automatic, flexible and accurate switching control of the bidirectional charging of the battery pack can be realized.
Conditions triggering the reverse energy supply: when an external power grid or a customer has urgent requirements, the controller receives corresponding external instructions and then controls the DC/DC of the battery to enter a reverse discharge state; when other batteries on the same common direct current bus enter a discharging state and the power grid allows reverse power transmission, a rectifier (such as a PWM rectifier) can automatically adjust a power angle to be a negative value in time according to a command, enter an inversion state from the rectifying state and reversely send electric energy back to the power grid.
Specifically, the power tube of the second power module is a silicon carbide MOS tube.
The second power module adopts a silicon carbide MOS tube (SiC MOSFET) as a power tube, and compared with the traditional silicon MOS tube (Si MOSFET), the on-resistance and the switching loss of the silicon carbide MOS tube are greatly reduced, so that the second power module can be suitable for higher working frequency and has better high-temperature stability.
In addition, the second control module 16 is configured to obtain a fault parameter reported by the battery management device 1; the fault parameters comprise fault types, occurrence times corresponding to the same fault type, occurrence time of faults, duration time of the faults and the like.
The second control module 16 is further configured to determine that electromagnetic interference occurs between the battery management device 1 and the charger 13 when the number of occurrences corresponding to the same fault type satisfies a preset condition within a set duration, generate a third trigger instruction, and send the third trigger instruction to the battery management device 1 to drive the battery management device 1 to be powered off or reset.
When the number of the parallel DC/DC is large, a reset circuit needs to be arranged on the BMS, and if faults caused by common mode interference are detected, the BMS is allowed to be repeatedly powered on and reset.
When a software fault (e.g., typical fault type: low battery insulation resistance) related to the charging architecture, battery insulation detection, etc. is detected in the BMS, the occurrence number exceeds an acceptable set number: for example, the number of occurrences within 24 hours is not more than 5, and no occurrence is repeated within 5 minutes, it may be determined that electromagnetic interference occurs in the circuit, and at this time, the charger will perform power-off and re-power-on operations on the battery management device 1, thereby ensuring that it returns to a normal operating state.
By analyzing the reported fault data in time, whether electromagnetic interference occurs between the battery management equipment 1 and the charger or not is determined in time, and the operation of power-off or power-on reset is performed in time when the occurrence is determined, so that the circuit can be ensured to be restored to a normal working state, and the stability, reliability and effectiveness of independent power supply to each battery pack can be ensured.
A step-down transformer is provided at the junction of the charger 13 and the external power grid, and the neutral point of the step-down transformer is not grounded to form a floating system. The safety and the reliability of the operation of the whole charging device are ensured by arranging the step-down transformer.
It should be noted that, considering that many DC links are involved in the charging device, a DC breaker or a fuse should be disposed on the AC/DC output side and each DC/DC input side to achieve the effect of protecting the circuit.
In addition, in the charging device of this embodiment, an independent online insulation detection device to ground needs to be specially disposed on the side of the common dc bus, and since the cathodes of all the common dc buses are directly connected together, the insulation fault of any one battery will be detected as a system insulation fault.
Compared with the existing charging device, the charging device can remarkably improve the charging efficiency (the specific improvement efficiency depends on the types of devices adopted by a charger and a rectifier), remarkably reduces the cost, and effectively improves the overall operation performance and efficiency of the bidirectional charging device.
In this embodiment, a common mode suppression circuit is added to the battery management device, for example, an isolation transformer is added to an ac power inlet, so that in the process of supplying power to the first control module by the first power module, common mode current formed in a corresponding circuit is blocked in time, a good common mode suppression effect is achieved, interference influence of the common mode current on the circuit or other devices is avoided, and timeliness, rationality and effectiveness of control and management on each battery pack are ensured when each battery pack is independently powered. In addition, the battery management equipment is integrated in the charging device, and the charging device is built through the battery management equipment, a charger and a background service device provided with a common mode suppression loop, so that the timely and effective suppression of the common mode current in a corresponding circuit in the bidirectional charging process of the battery pack is ensured; meanwhile, through the improved circuit design of the charger, the bidirectional charging function can be supported, and the circuit has the advantages of simple structure, low cost and high efficiency, and the overall operation performance and efficiency of the charging device are effectively improved.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the principles and spirit of the invention, but such changes and modifications fall within the scope of the invention.
Claims (14)
1. A battery management device, wherein the battery management device is applied to a power exchange station or an energy storage station, and comprises at least one battery pack management unit, and each battery pack corresponds to one battery pack management unit;
the battery pack management unit comprises a common mode suppression circuit, a first power supply module and a first control module which are electrically connected in sequence, wherein the common mode suppression circuit is electrically connected with an external alternating current power supply;
the common mode rejection circuit comprises a plurality of isolation transformers;
the first power supply module is used for supplying power to the first control module;
the common mode rejection circuit is used for blocking common mode current formed in the corresponding circuit in the process of supplying power to the first control module by the first power module.
2. The battery management apparatus according to claim 1, wherein when the common mode rejection circuit includes a plurality of the isolation transformers, the plurality of the isolation transformers are connected in such a manner that:
all in series, all in parallel, or some in series and the remainder in parallel.
3. The battery management apparatus of claim 1, wherein the first control module comprises a charge controller and a BMS battery management module;
the first power supply module comprises a first power supply unit and a second power supply unit;
the first power supply unit is electrically connected with the charging controller and is used for providing a first set direct-current voltage for the charging controller;
the second power supply unit is electrically connected with the BMS battery management module and is used for providing a second set direct current voltage for the BMS battery management module.
4. The battery management apparatus of claim 3 wherein the first power supply unit is a first rectifier and the second power supply unit is a second rectifier;
the input end of the common mode rejection circuit is electrically connected with the external alternating current power supply, the output end of the common mode rejection circuit is electrically connected with the input end of the first rectifier, and the first rectifier is used for converting the alternating current voltage output by the common mode rejection circuit into the first set direct current voltage and supplying power to the charging controller by adopting the first set direct current voltage;
the input end of the second rectifier is electrically connected with the output end of the common mode rejection circuit, and the second rectifier is used for converting the alternating voltage output by the common mode rejection circuit into the second set direct voltage and supplying power to the BMS battery management module by adopting the second set direct voltage.
5. The battery management apparatus according to claim 3 or 4, wherein the battery pack management unit further includes a reset switch;
the reset switch is electrically connected between the second power supply unit and the BMS battery management module, and is electrically connected with the charge controller.
6. A charging apparatus, characterized in that the charging apparatus comprises the battery management device according to any one of claims 1 to 5.
7. The charging apparatus of claim 6, further comprising a background service device, and a charger communicatively coupled to the background service device and the battery management device, respectively.
8. The charging device of claim 7, wherein the background service device is integrally provided with a common mode rejection loop.
9. The charging device of claim 8, wherein the common mode rejection loop comprises a differential operational amplifier circuit, a magnetically isolated amplifier, a common mode magnetic loop, or an optocoupler isolation.
10. The charging device according to any one of claims 7 to 9, wherein the charger includes a rectifying unit, a second control module, a plurality of second power supply modules, and a battery pack, each of the battery packs corresponding to one of the second power supply modules;
the input end of the rectifying unit is electrically connected with an external alternating current power supply, the output end of the second power supply module is electrically connected with the positive electrode of the corresponding battery pack, and the output end of the rectifying unit, the input end of each second power supply module and the negative electrode of the corresponding battery pack are all connected to a public direct current bus;
the rectification unit is used for rectifying the externally input alternating voltage to obtain rectified voltage, and outputting the rectified voltage to the public direct current bus;
the second power supply module is used for acquiring the rectification voltage from the public direct current bus, converting the rectification voltage into a third set direct current voltage, and supplying power to the corresponding battery pack by adopting the third set direct current voltage;
the second control module is used for generating a first trigger instruction and sending the first trigger instruction to the second power module after receiving an external reverse power transmission instruction;
the second control module is used for generating a second trigger instruction and sending the second trigger instruction to the rectifying unit when the external inverted power transmission instruction is received and all the battery packs on the same public direct current bus are determined to be in a discharging state;
the second power supply module is used for entering a reverse discharge state according to the first trigger instruction, and the rectifying unit is used for adjusting a power angle to a set position according to the second trigger instruction so as to switch the charger from the rectifying state to the inversion state.
11. The charging device of claim 10, wherein the rectifying unit is an AC/DC voltage converter;
the AC/DC voltage converter adopts a PWM rectification mode, a 24-pulse rectification mode or a rectification mode combining Vienna rectification and PFC rectification.
12. The charging device of claim 10, wherein the second control module is configured to obtain a fault parameter reported by the battery management apparatus; the fault parameters comprise fault types and occurrence times corresponding to the fault types;
and the second control module is also used for determining that electromagnetic interference occurs between the battery management equipment and the charger when the occurrence times corresponding to the same fault type meet the preset condition within the set time length, generating a third trigger instruction and sending the third trigger instruction to the battery management equipment so as to drive the battery management equipment to be powered off or reset.
13. The charging device of claim 10, wherein the second power module is a non-isolated DC/DC converter.
14. The charging device of claim 13, wherein the power tube of the second power module is a silicon carbide MOS tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2022/143474 WO2023125827A1 (en) | 2021-12-30 | 2022-12-29 | Battery management device and charging apparatus |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2021116592396 | 2021-12-30 | ||
| CN202111659239 | 2021-12-30 |
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| CN116388316A true CN116388316A (en) | 2023-07-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211679571.3A Pending CN116388316A (en) | 2021-12-30 | 2022-12-26 | Battery management device and charging device |
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| CN (1) | CN116388316A (en) |
| WO (1) | WO2023125827A1 (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104816645B (en) * | 2015-04-01 | 2017-02-01 | 深圳市科列技术股份有限公司 | Master control module used for battery management system (BMS) of electric vehicle |
| JP2018098566A (en) * | 2016-12-09 | 2018-06-21 | 日立金属株式会社 | Cable module for communication and transmission loss compensation circuit |
| CN106936146B (en) * | 2017-04-11 | 2020-04-03 | 深圳市华宝新能源股份有限公司 | Household solar energy storage power generation system |
| CN108909517A (en) * | 2018-08-04 | 2018-11-30 | 泰州巨亚智能科技合伙企业（有限合伙） | A kind of bidirectional pulse battery management system for electric car |
| CN112039174A (en) * | 2020-09-29 | 2020-12-04 | 珠海华创泰能能源科技有限公司 | Centralized charging station circuit topology based on direct-current bus power supply and implementation method |
| CN113629757B (en) * | 2021-06-30 | 2024-02-09 | 华为数字能源技术有限公司 | Energy storage device, energy storage device control method and photovoltaic system |
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| WO2023125827A1 (en) | 2023-07-06 |
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