CN114228562A - Power battery charging and discharging management system and method thereof - Google Patents

Power battery charging and discharging management system and method thereof Download PDF

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Publication number
CN114228562A
CN114228562A CN202010938310.3A CN202010938310A CN114228562A CN 114228562 A CN114228562 A CN 114228562A CN 202010938310 A CN202010938310 A CN 202010938310A CN 114228562 A CN114228562 A CN 114228562A
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China
Prior art keywords
battery
charging
battery pack
voltage
series
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CN202010938310.3A
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Chinese (zh)
Inventor
邓金权
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TLD ASIA (SHANGHAI) Ltd
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TLD ASIA (SHANGHAI) Ltd
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Priority to CN202010938310.3A priority Critical patent/CN114228562A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
    • B60L58/19—Switching between serial connection and parallel connection of battery modules
    • 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
    • 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
    • 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
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • 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
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/14—Plug-in electric vehicles
    • 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
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/16—Information or communication technologies improving the operation of electric vehicles

Abstract

Power battery charge and discharge management system includes: a modular battery pack; the power battery charging and discharging management device receives a charging detection unit or a discharging battery unit control signal on the electric equipment and is linked with the selection circuit to discharge the electric equipment from the modular battery pack or charge the modular battery pack by the charging equipment; and the battery pack series-parallel connection conversion unit. The power battery charging and discharging management method comprises the following steps: in the battery charging mode, judging whether the charging device provides a charging voltage range with a first voltage series value or a second voltage series larger than the first voltage series through a charging detection unit control signal; if the charging voltage value is a first voltage series, selecting a first mode, namely a low-voltage mode, to charge; if the charging voltage value is larger than the first voltage series value, the second mode, namely the high-voltage mode, is selected for charging. Therefore, the magnitude of the voltage value of the external power supply can be discriminated, and safe charging under low voltage and high voltage is realized.

Description

Power battery charging and discharging management system and method thereof
Technical Field
The invention relates to the field of battery management, in particular to a power battery charging and discharging management device and a method thereof.
Background
With the mature development of the domestic electric vehicle industry, the airport special equipment puts forward a new demand on new energy, namely a power lithium battery system; the existing electric automobile adopts a high-voltage technical scheme due to the requirement of compact space, and the power battery has the characteristics of high speed, high power, high energy density, long endurance and the like in an application scene; the first requirement of safety of the airport ground special equipment, the low-speed large-torque short-distance intermittent working characteristic are not suitable, the special safety requirement of a low-voltage 80V universal voltage system of the international on-board ground special equipment and the special application occasion of the airport special equipment are combined, and the splayed guideline of safety, applicability, energy conservation and environmental protection of the special equipment of the civil aviation bureau is met; the company develops a ZL201921794846.1 modular standard battery box in the early stage, is suitable for a lithium iron battery system of airport special equipment, and is a standardized, modular and serialized intelligent battery system.
However, in the prior art, the charging power supply voltages of the charging pile systems installed at different airports are not uniform. Some low-voltage systems suitable for charging 80V battery packs are provided or only provided, and the charging voltage range is 50-150V; the method comprises the following steps that a high-low voltage charging compatible charging system is provided for an airport, and the charging voltage range is 50-750V; and some airports only have a high-voltage system, and the charging voltage is 200-750V. Therefore, how to realize the universality of the high-low voltage system for charging the battery pack of the special equipment, intelligently identify the high-low voltage system and automatically select the corresponding charging program, prevent the generation of wrong voltage charging, reduce the possibility of misoperation and the like become important problems to be solved in the design field of the battery charging system in the airport.
Moreover, the vehicles in the airport are of various types and complex in working conditions, and the functions to be realized are different, for example: the system comprises a luggage conveying vehicle, an airplane tractor, a bulk cargo loader, an object tractor, a bridge-mounted device, an airplane guide vehicle, a passenger ferry vehicle and the like, wherein the power supply voltage is low due to safety requirements in part of working conditions, and the power supply voltage is high due to power requirements in part of working conditions. Therefore, how to provide different voltages according to different working conditions is also an important problem to be solved in the field of design of power battery charging and discharging management systems.
Disclosure of Invention
The technical problem to be solved by the invention is that special equipment in different airports adopts a universal modular battery pack to provide a safe and reliable low-voltage power supply; the invention can adapt to the charging mode without providing the charging equipment, and realizes the high-low voltage intelligent charging of various charging equipment.
In order to solve the technical problems, the invention provides a power battery charging and discharging management device and a method thereof, aiming at being suitable for charging a battery pack under high-voltage and low-voltage charging voltages and meeting the intelligent charging requirements of various existing chargers in different airports.
In order to achieve the above object, the present invention provides a power battery charging and discharging management system, including:
the modular battery pack is used for providing a battery pack with rated voltage of electric equipment;
the power battery charging and discharging management device is used for receiving control signals of a charging detection unit or a discharging battery unit on the electric equipment and is linked with the selection circuit to discharge the electric equipment from the modular battery pack or charge the modular battery pack by the charging equipment;
the battery pack series-parallel connection conversion unit is used for series connection or parallel connection through the battery pack series-parallel connection conversion unit according to a high-voltage mode or a low-voltage mode established by a charging detection unit or a discharging detection unit of the electric equipment.
Preferably, the rated voltage of the electric equipment is the nominal voltage value of the modular battery pack; the modularized battery pack comprises a battery anode connecting point, a battery cathode connecting point, a quick overhaul fuse, a battery on-off relay, a battery data acquisition unit, a battery heating pad, a battery data interface, a micro-spark ultraviolet detector and a fire extinguishing control interface.
Preferably, the power battery charging and discharging management device comprises a battery management system, a control power supply and interlocking control unit, a battery pack interface unit, a battery pack serial-parallel conversion unit, a charging permission interface unit and a discharging interface circuit.
Preferably, the battery pack interface unit comprises a positive connection point, a negative connection point, a battery data interface, a fire extinguishing control interface and a battery management system status indication which are connected with the modular battery pack; the discharging allows the interface unit to supply power to the electric equipment for output; receiving the charging of the modular battery pack by the charging device through the charging permission interface unit; and the battery management system is used for carrying out mode identification and controlling charging and discharging, safety management and data storage of the power battery.
Preferably, the battery pack series-parallel conversion unit may perform series-parallel connection of battery packs to obtain two different nominal voltages of the battery system;
when the N battery packs are connected in parallel through the battery pack serial-parallel connection conversion unit, the nominal voltage value of the battery system is the rated voltage value of a single modularized battery pack, and the nominal voltage value is a low-voltage mode;
when the N battery packs are connected in series through the battery pack series-parallel connection conversion unit, the nominal voltage value of the battery system is N times of the rated voltage of the single modularized battery pack, and the battery system is in a high-voltage mode.
Preferably, the series-parallel connection conversion of the battery pack is controlled by the battery management system according to the discharge state of the discharge detection unit of the electric equipment and the charge mode switch state of the charge detection unit;
the parallel connection of the battery packs is determined by the discharge state of the discharge detection unit of the electric equipment and the charge mode switch state of the charge detection unit, namely the battery packs are in a low-voltage mode, and the rated voltage is the nominal voltage of a single modular battery pack;
the battery pack is connected in series and is determined by the charging mode switch state II of the charging detection unit, namely the battery pack is in a high-voltage mode, and the rated voltage is N times of the nominal voltage of a single modular battery pack.
Preferably, the battery pack series-parallel conversion unit includes a first relay control circuit and a second relay control circuit; the first relay control circuit is connected with a relay power supply contact and a relay electromagnetic coil in parallel; the second relay control circuit is connected with a relay power supply contact and an electromagnetic coil in series; the first relay and the second relay control circuit are controlled by a battery management system, and a control power supply and an interlocking control unit provide power supplies;
the control power supply and interlocking control unit is provided with a power supply unit and serial-parallel interlocking detection control, wherein the power supply unit comprises a direct current-direct current converter and converts the nominal voltage of the battery pack into the control power supply voltage of the battery management system; the series-parallel connection interlocking detection control is used for detecting the control states of a first relay and a second relay;
the number N of the battery packs is at least two, and each battery pack comprises a positive electrode connecting point and a negative electrode connecting point;
the relay comprises N-1 series relays and 2N-2 parallel relays;
the parallel relay further comprises a parallel normally open contact, and the series relay further comprises a series normally open contact;
the first relay control circuit is a battery pack parallel control circuit, and the positive pole connection points of the modular battery packs are connected through parallel relay normally open contacts; the negative pole connecting points are connected through a normally open contact of a parallel relay; 2N-2 normally open contacts of the parallel relays are closed, and N-1 normally open contacts of the series relays are opened, so that the modular battery packs are connected in parallel;
the second relay control circuit is a battery pack series connection control circuit, the modular battery packs are numbered in sequence, and N-1 pairs of positive/negative electrode connection points of the two battery packs which are adjacent in sequence are connected through a normally open contact of a series relay; and the normally open contacts of the N-1 series relays are closed and the normally open contacts of the 2N-2 parallel relays are opened, so that the modular battery packs are connected in series.
Preferably, the power battery charge and discharge management system further includes:
the discharge detection unit comprises a battery management system control power switch and a power supply switch;
the charging detection unit comprises a charging electric gun signal and a high-low voltage mode switch;
the battery management system controls a power switch and a power supply switch, and a charging lance inserting signal is linked with a high-low voltage mode switch to determine the system state of the battery management system and perform battery charging and discharging management;
the battery pack serial-parallel conversion unit is connected with a first relay control coil in parallel in a discharging and charging mode, and the battery pack serial-parallel conversion unit is connected with a second relay control coil in series in a charging mode;
the charging permission interface unit comprises a charging permission control relay, is connected with external charging equipment, and controls the charging permission control relay in a charging state after the series-parallel connection of the battery packs is completed;
the discharge permission interface unit comprises a discharge permission control relay, is connected with external electric equipment, and controls the discharge permission control relay in a discharge state after the series-parallel connection of the battery packs is completed.
In order to achieve the above object, the present invention further provides a power battery charging and discharging management method, including:
in the charge mode of the battery, the battery is charged,
the charging detection unit judges whether the voltage value of the power supply of the external charging equipment is a first voltage value or a second voltage value larger than the first voltage value according to the charging insertion state and the charging mode switch state;
if the voltage value of the power supply of the external charging equipment is a first voltage value, selecting a first mode for charging;
and if the power supply voltage value of the external charging equipment is greater than the first voltage value, selecting a second mode for charging.
Preferably, at least two battery packs are charged for the second mode; the first voltage value is set as the voltage charging of a single battery pack or the parallel charging of a plurality of battery packs;
in the first mode, all the battery packs are connected in parallel;
in the second mode, the battery packs are connected in series.
Preferably, the power battery charging and discharging management method further includes:
a charging and discharging mode detection step, wherein the charging detection unit and the discharging detection unit are used for judging that the battery system is in a discharging mode;
in the discharge mode of the battery, the battery is,
through discharge detection unit state detection and series-parallel linkage control, each battery pack is connected in parallel, and the discharge permission interface unit closes the discharge permission relay to provide low-voltage power supply for the electric equipment. Compared with the prior art, the invention provides a power battery charging and discharging management device, which comprises: a battery pack interface unit for connecting a plurality of modular battery packs; the control power supply and interlocking control unit is used for converting the nominal voltage of the modular battery pack into the control voltage of the BMS battery management system and controlling the serial-parallel interlocking control of the battery pack; the system comprises a BMS battery management system, a plurality of modularized battery pack systems, a plurality of intelligent control modules and a plurality of intelligent control modules, wherein the BMS battery management system is communicated with the plurality of modularized battery pack systems, acquires information of each battery unit, controls the battery pack to be cut off or put into use according to the voltage, the temperature and the micro-spark detection of a battery pack cell, controls heating and fire extinguishing, and simultaneously performs charging management on external charging equipment and discharge control on electric equipment; the battery pack serial-parallel connection conversion unit is used for judging the state of a battery system according to the discharge detection unit and the charge detection unit, selecting the power supply voltage of the battery pack system, and connecting a plurality of modularized battery packs in parallel or in series; the charging permission interface unit comprises a charging permission control relay and is connected with external charging equipment, and after the series-parallel connection of the battery pack series-parallel connection conversion unit is completed, the charging permission control relay is controlled according to the state of a charging mode I or a charging mode II; and the discharge permission interface unit comprises a discharge permission control relay and is connected with external electric equipment, and after the parallel connection of the battery pack serial-parallel connection conversion unit is completed, the discharge permission control relay is controlled in a discharge state. A charge detection unit comprising a charge pistol signal and a charge voltage mode switch comprising a first charge mode and a second charge mode; and the discharge detection unit comprises a BMS power switch and a power supply switch and is used for performing discharge control on the battery system. The invention also provides a power battery charging and discharging management method, which comprises the following steps: in the battery charging mode, the charging detection unit judges whether the voltage value of the power supply of the external charging equipment is a first voltage value or a second voltage value larger than the first voltage value according to the charging insertion state and the charging mode switch state; if the voltage value of the power supply of the external charging equipment is a first voltage value, selecting a first mode to carry out low-voltage charging; and if the power supply voltage value of the external charging equipment is greater than the first voltage value, selecting a second mode to carry out high-voltage charging. In the battery discharging mode, the battery packs are connected in parallel through state detection and series-parallel linkage control of the discharging detection unit, the discharging allowing interface unit closes the discharging allowing relay, and low-voltage 'safe' power supply is provided for the electric equipment.
Drawings
Fig. 1 is a schematic connection diagram of a battery charge and discharge management system according to the present invention.
Fig. 2 is a schematic diagram of the connection relationship of the battery charging and discharging management device according to the present invention.
Fig. 3 is a schematic diagram illustrating a connection relationship between the series-parallel conversion unit of the battery pack according to the present invention.
Fig. 4 is a schematic connection diagram of an example of the battery charge/discharge management system according to the present invention.
Fig. 5 is a control flow diagram illustrating a battery charging/discharging management method according to the present invention.
Fig. 6 is a flow chart of series-parallel conversion control of the battery charge-discharge management method according to the present invention.
Description of the reference numerals
1 Battery charging and discharging management device 11 positive pole connection point
12 negative pole connecting point 13 battery pack communication port
14 fire suppression control port 15 device status indication
16 BMS data interface 101 BMS battery management system
102 control power supply and interlocking control unit 103 battery pack interface unit
104 battery pack series-parallel conversion unit 105 charge permission interface unit
106 discharge permission interface unit 1041 first relay control circuit
1051 Charge permit Relay 1042 second Relay control Circuit
1052 charging unit fuse 1041-1/2/(n-1) anode parallel relay
1053 charging and discharging current detection 1041-1/2/(n-1)' negative pole parallel relay
1061 discharge permission relay 1042-1/2/(n-1) series relay
1062 discharge unit fuse 2 electric equipment
201 charging detection unit 202 discharging detection unit
21 discharge positive electrode connection point 22 discharge negative electrode connection point
23 discharging communication interface 3 charging equipment
301 charge communication 31 charge anode connection point
32 charging cathode connection point 33 charging communication interface
4 modularization battery package 41 battery package positive pole tie point
42 battery package negative pole tie point 43 battery package communication port
401 battery module of 44 battery pack fire extinguishing control port
402 little spark ultraviolet sensor of battery package information processing unit 403
404 battery pack fire extinguishing unit 405 battery pack heating unit
406 battery pack fuse 407 battery pack relay
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings.
The invention provides a power battery charging and discharging management device, which comprises: a battery pack interface unit for connecting a plurality of modular battery packs; the control power supply and interlocking control unit is used for converting the nominal voltage of the modular BATTERY pack into the control power supply voltage of a BATTERY management system (BMS, BATTERY MANAGEMENT SYSTEM) and performing serial-parallel interlocking detection and control on the serial-parallel conversion unit of the BATTERY pack; a BMS battery management system to control battery charging and discharging management.
The BMS battery management system is communicated with the plurality of modular battery pack systems, acquires information of each battery unit, and controls the battery pack to be cut off or put into use, heated and controlled to extinguish fire according to the voltage, the temperature and the micro-spark detection of the battery pack core; and simultaneously, carrying out charging management on external charging equipment and discharging control on the electric equipment. The battery pack serial-parallel connection conversion unit is used for judging the state of the battery system according to the discharge detection unit and the charge detection unit, selecting the power supply voltage of the battery pack system, and connecting a plurality of modularized battery packs in parallel or in series.
The battery pack power supply voltage value is set to be a first power supply voltage value and a second power supply voltage value, the second power supply voltage value is larger than the first power supply voltage value, the first power supply voltage value is low voltage, and is the nominal voltage of a single modularized battery pack or the nominal voltage of a plurality of modularized battery packs after being connected in parallel, and is also the nominal voltage of the single modularized battery pack; the second power supply voltage value is high voltage, and the voltage after the plurality of battery packs are connected in series is N times of the nominal voltage of the single modularized battery pack. A charging detection unit comprising a charging pistol signal and a charging voltage mode switch comprising a first charging mode and a second charging mode.
The first charging mode is a low-voltage mode, a low-voltage charger is used for corresponding external charging, the charging voltage range is 50-150 VDC (Direct Current), charging of a single or multiple modular battery packs in parallel is met, and the voltage of the battery system is the nominal voltage of the single modular battery pack; the second charging mode is a high-voltage mode, the corresponding external charging mode is a high-voltage charger or a high-low voltage compatible charger, the charging voltage range is 200-750 VDC or 50-750 VDC, the charging mode can be used for charging a battery system formed by connecting a plurality of modularized battery packs in series, the voltage of the battery system is N times of the voltage of a single battery, and N is typically 2-9. And the discharge detection unit comprises a BMS power switch and a power supply switch and is used for performing discharge control on the battery system.
The charging detection unit and the discharging detection unit are used for determining a standby dormant state, a discharging state or a charging state of the battery system, and the charging state is a first charging mode state or a second charging mode state; according to the discharging state and the charging state, the serial-parallel connection control device is used for controlling the serial-parallel connection control of the serial-parallel connection conversion unit of the battery pack, the serial-parallel connection control comprises a first relay control circuit and a second relay control circuit, and a parallel relay power supply contact and a relay coil are connected in the first relay control circuit; the second relay control circuit is connected with a relay power supply contact and an electromagnetic coil in series. The first relay and the second relay control circuit are controlled by a BMS battery management system, and power is supplied by a control power supply and an interlocking control unit.
The number of the battery packs is at least two, and each battery pack comprises a positive electrode connecting point and a negative electrode connecting point; there are N-1 series relays, i.e. the second relay, and 2N-2 parallel relays, i.e. the first relay. The parallel relay further comprises a parallel normally open contact, and the series relay further comprises a series normally open contact; the first relay control circuit is a battery pack parallel control circuit, and the positive pole connection points of the modular battery packs are connected through parallel relay normally open contacts; the negative pole connecting points are connected through a normally open contact of a parallel relay; and 2N-2 normally open contacts of the parallel relays are closed and N-1 normally open contacts of the series relays are opened, so that the parallel connection of the modular battery packs is realized. The second relay control circuit is a battery pack series connection control circuit, the modular battery packs are numbered in sequence, and N-1 pairs of positive/negative connection points of the two battery packs which are adjacent in sequence are connected through a normally open contact of a series relay. And the normally open contacts of the N-1 series relays are closed and the normally open contacts of the 2N-2 parallel relays are opened, so that the modular battery packs are connected in series.
The battery charge and discharge management device further comprises: and the charging permission interface unit comprises a charging permission control relay and is connected with external charging equipment, and after the series-parallel connection of the battery pack series-parallel connection conversion unit is completed, the charging permission control relay is controlled according to the state of a charging mode I or a charging mode II. And the discharge permission interface unit comprises a discharge permission control relay and is connected with external electric equipment, and after the parallel connection of the battery pack serial-parallel connection conversion unit is completed, the discharge permission control relay is controlled in a discharge state.
The invention also provides a power battery charging and discharging management method, which comprises the following steps: in the battery charging mode, the charging detection unit judges whether the voltage value of the power supply of the external charging equipment is a first voltage value or a second voltage value larger than the first voltage value according to the charging insertion state and the charging mode switch state; if the voltage value of the power supply of the external charging equipment is a first voltage value, selecting a first mode for charging; and if the power supply voltage value of the external charging equipment is greater than the first voltage value, selecting a second mode for charging.
The battery charging and discharging management method further comprises the following steps: a charging and discharging mode detection step, wherein the charging detection unit and the discharging detection unit are used for selecting whether the battery system is in a charging mode or a discharging mode; in the battery discharging mode, the battery packs are connected in parallel through state detection and series-parallel linkage control of the discharging detection unit, the discharging allowing interface unit closes the discharging allowing relay, and low-voltage 'safe' power supply is provided for the electric equipment.
Referring to fig. 1, the present invention provides a power battery charging and discharging management system, including: the battery charging and discharging management device 1 is characterized in that the battery charging and discharging management device 1 is connected with a plurality of modular battery packs 4 through battery pack interface units 103 in the battery charging and discharging management device 1; the electrical equipment 2 is connected through the discharge permission interface unit 106; charging is allowed to connect through the charging-allowing interface unit 105The electric device 3 constitutes a power battery system. Modular battery pack 4-way control Power Supply and interlock control unit (PSC)&Control Module)102 provides a first power voltage, which is converted into a bms (battery Management system) by DC-DC conversion to provide a Control power for the battery Management system 101; the battery charging and discharging management device 1 obtains the battery system state through the charging detection unit 201 and the discharging detection unit 202 of the electric equipment 2, performs series-parallel conversion on a plurality of input modularized battery packs 4 through the battery pack series-parallel conversion unit 104 through the BMS battery management system 101 and the control power supply and interlocking control unit 102, and obtains a first power supply voltage V where the battery system power supply voltage (DC +/DC-) is the nominal voltage of the modularized battery packs 41Or a second supply voltage V which is N times the nominal voltage of the modular battery pack 42。
Series connection (S) and parallel connection (P).
Referring to fig. 1, the nominal value of the embodiment of the modular battery pack 4 provided by the present invention is 80V (volt) 227A (ampere) h (hour), the modular battery pack 4 is a 1P25S (i.e. the battery cells 1 are connected in series by 25) and is composed of a plurality of battery modules 401, and the modular battery pack 4 further includes a battery pack information processing unit 402, a micro-spark ultraviolet sensor (UV)403, a battery pack Fire Extinguishing unit (FES, Fire Extinguishing System) 404, a battery pack heating unit 405, a battery pack fuse 406, a battery pack relay 407, and the like, in addition to the battery modules 401. The modular battery pack 4 is connected to the battery charge and discharge management apparatus 1 through the positive electrode connection point 41, the negative electrode connection point 42, the communication port 43, and the fire extinguishing control port 44, and is controlled by the BMS battery management system 101 and performs data processing, display, storage, etc. of the battery pack.
Referring to fig. 1, the nominal power voltage of the modular battery pack 4 of the embodiment is 80V, which is the first power voltage V1。
Fig. 2 is a schematic diagram illustrating the connection relationship of the battery charging and discharging management device according to the present invention. The battery pack interface unit 103 comprises an anode (BV1+, BV2+, … and BVn +) connection point 11 connected with a battery pack anode connection point 41 and a cathode (BV1-, BV2-, … and BVn-) connection point 12 connected with a battery pack cathode connection point 42, wherein n is 2-7; the battery pack communication port 13 is connected to the battery pack communication port 43 through a control wire harness, the fire extinguishing control port 14 is connected to the battery pack fire extinguishing control port 44 through a wire harness, and the device status indication 15 of the battery system is displayed. The charge permission interface unit 105 includes a charge unit fuse 1053, a charge permission relay 1051, a charge/discharge current detection 1053, a charge positive electrode connection point 31, a charge negative electrode connection point 32, and a charge communication interface 33, and the like. The discharge enable interface unit 106 includes a discharge unit fuse 1062, a discharge enable relay 1061, a discharge positive electrode connection point 21, a discharge negative electrode connection point 22, a discharge communication interface 23, and the like. Referring to fig. 3, the battery pack serial-parallel conversion unit 104 is a schematic connection relationship diagram of the battery pack serial-parallel conversion unit according to the present invention.
The battery pack serial-parallel conversion unit 104 is composed of a first relay control circuit 1041 and a second relay control circuit 1042, and a plurality of modular battery packs 4(BV1+/BV1-, BV2+/BV2-, …, BVn +/BVn-) connected with the power battery charging and discharging management device 1 are connected in series-parallel through the relay control circuits, so that a first power voltage V with the battery system power voltage (DC +/DC-) being the nominal voltage of the modular battery packs 4 is obtained1Or a second supply voltage V n times the nominal voltage of the modular battery pack 42And n is 1-7.
First power supply voltage value V1Set to the nominal voltage of the single piece modular battery pack 4.
Second voltage value V2Set to n times the nominal voltage of modular battery pack 4.
Specifically, referring to fig. 3, a schematic diagram of a connection relationship between the battery pack serial-parallel conversion unit according to the present invention is accessed to n modular battery packs 4 of the battery charging and discharging management device 1, a nominal voltage (BVn +/BVn-) of a single modular battery pack 4 is 80V, n is 1-9, and the n modular battery packs 4 are connected in parallel or in series through the first relay control circuit 1041 or the second relay control circuit 1042, so as to obtain a battery system power voltage (DC +/DC-) as a first power voltage V1I.e. nominal voltage of a single modular battery pack 4 or parallel voltage of 80V of n modular battery packs 4, or second supply voltage V2I.e. n modular linesThe cell packs 4 are connected in series at n times the nominal voltage of a single modular cell pack 4, n x 80V.
Referring to fig. 1, a modular battery pack 4 according to an embodiment is a lithium iron phosphate battery cell, a nominal voltage of the battery cell is 3.2V, and a voltage range is 2.5-3.65V, the battery pack according to the embodiment is composed of 25 battery cells 1 connected in parallel and 25 in series, the nominal voltage of the battery pack is 80V, and the voltage range is 62.5-91.25V.
According to an embodiment of the invention, the first supply voltage V1The voltage of the multi-modular battery pack 4 is connected in parallel, namely 80V, the voltage range is 62.5-92.25V, and the voltage range is equal to the nominal voltage and the voltage range of a single modular battery pack 4.
Second supply voltage V2The voltage is applied in series to a plurality of modular battery packs 4, i.e., n × 80V, in a range of n × V (62.5 to 92.25) V, which is n times the nominal voltage and voltage range of a single modular battery pack 4:
n is 2, two battery packs are connected in series, the nominal voltage is 160V, and the voltage range is 125-182.5V
n is 3, three battery packs are connected in series, the nominal voltage is 240V, and the voltage range is 187.5-273.75V
n is 4, four battery packs are connected in series, the nominal voltage is 320V, and the voltage range is 250-365V
n is 5, five battery packs are connected in series, the nominal voltage is 400V, and the voltage range is 312.5-456.25V
n is 6, six battery packs are connected in series, the nominal voltage is 480V, and the voltage range is 375-547.5V
n is 7, seven battery packs are connected in series, the nominal voltage is 560V, and the voltage range is 437.5-638.75V
The single-piece modular battery pack 4 is divided into 1 parallel 25 strings (1P25S), and n is the number of battery packs connected in series, namely n × 25S; by adopting the modular battery pack 4, different capacities are configured according to system requirements, and the battery pack can be put into the battery pack serial-parallel conversion unit 104 after being connected in parallel, for example, when 6 single modular battery packs 4 are connected in series and parallel, a 1P25S × 6S-1P 150S battery system can be formed to put six battery packs into series (n-6), the nominal voltage is 480V, and the voltage range is 375-547.5V; the battery charging and discharging management device can also form a 1P 25S-2P 3S-2P 75S battery system, 2 modular battery packs are connected in parallel and then put into three battery packs to be connected in series (n-3), the nominal voltage is 240V, and the voltage range is 187.5-273.75V so as to optimize the battery charging and discharging management device 1; likewise:
the battery system can be 1P25S × 8S ═ 1P200S, n ═ 8, or 1P25S × 2P4S ═ 2P100S, and n ═ 4.
The battery system can be 1P25S, 9S, 1P225S, and n 9, or 1P25S, 3P3S, 3P75S, and n 3.
In order to keep the voltage balance of the single battery packs of the battery system, the parallel connection quantity in the series battery packs needs to be equal, for example, 6 single modular battery packs form 2 parallel and 3 series; 8 single modular battery packs form 2 parallel strings and 4 back strings; the 9 single-piece modular battery packs form 3 parallel strings and the number of the series-parallel relays is reduced.
Referring to fig. 3, which is a schematic diagram of a connection relationship of the battery pack series-parallel conversion unit of the present invention, the battery pack series-parallel conversion unit 104 includes 2n-2 parallel relays in the first relay control circuit 1041, i.e., the positive parallel relays 1041-1, 1041-2, …, 1041- (n-1) and the negative parallel relays 1041-1 ', 1041-2 ', …, 1041- (n-1) ', and includes n-1 series relays in the second relay control circuit 1042, i.e., the series relays 1042-1, 1042-2, …, 1042- (n-1); when n is 2, 1 series relay and 2 parallel relays are needed; when n is 3, 2 series relays, 4 parallel relays, etc. are required.
When the airport charger is a low-voltage charging system, the charging range is 50-150V, and the charging mode switch in the charging detection unit 201 is configured in a first charging mode, i.e. a low-voltage parallel mode.
When the airport charger is a high-voltage or high-low voltage charging system, the charging range is 200-750V or 50-750V, and the charging mode switch in the charging detection unit 201 is configured in a charging mode two, namely a high-voltage series mode; the number n of the concatemers is preferably 3 to 7. The multiplied number of battery packs 6 may be fed into the battery pack serial-parallel conversion unit after n is 3 or 6, i.e., 2 parallel 3 strings or 1 parallel 6 strings, 8 is preferably fed after n is 4, i.e., 2 parallel 4 strings, and 9 is preferably fed after n is 3, i.e., 3 parallel 3 strings.
Referring to fig. 4, a schematic diagram of a connection relationship of an example of the battery charge and discharge management system of the present invention is shown, where the example includes 4 single-piece modular battery packs 4a,4b,4c, and 4d, or 8 single-piece modular battery packs including 4a,4b,4c, and 4d that are put into 2 single-piece modular battery packs after being connected in parallel, that is, the serial-put number n is 4; the battery charge/discharge management device 1 connects the series input of n-4 through the battery pack interface unit 103, and after the battery pack serial/parallel conversion unit 104 performs parallel or serial connection of detection signals of the charge detection unit 201 and the discharge detection unit 202 without errors through the control power supply and interlock control unit 102, the BMS battery management system 101 receives charging from the external charging device 3 through the charge permission interface unit 105; or by allowing the interface unit 106 to discharge the consumer 2.
The battery charging and discharging management device is also provided with a battery system device state display 15 and a BMS battery management system 101 external BMS data interface 16 for charging and discharging data record access, BMS software upgrade, BMS system configuration and the like.
Referring to fig. 2 and 4, an external charging device (CHG, Charger)3 includes a charging communication port 301 and a charging communication port 33 connected to the battery charging and discharging management apparatus 1, and may provide external control power to the BMS battery management system.
Referring to fig. 2 and 4, an electric device (EV) 2 includes a charging detection unit 201 having a charging gun detection signal CC2(charge Connected) and a charging mode Switch H/l (high Voltage or Low Voltage), and a discharging detection unit 202 having a BMS Power Switch (KOP) and an access Switch signal (ACC).
A dc-dc converter (DCDC converter) can convert a dc voltage to boost or buck the dc voltage.
Referring to fig. 5, the present invention further provides a power battery charging and discharging management method, including: the battery charging and discharging management device status indication 15 includes a battery management system shutdown status, a standby sleep mode, a discharging status, a charging status, a system fault status, an impending shutdown mode, a BMS system initialization and BMS bootstrap loading mode, and the like.
When external control power is supplied to the BMS battery management system through the charging communication interface 33, and the BMS power switch KOP in the discharging detection unit 202 is not turned on, and the gun insertion confirmation signal CC2 in the charging detection unit 201 is disabled, the BMS battery management system 101 enters the BMS bootstrap loading mode in which the BMS software upgrade and data access are performed.
When the BMS controls the power switch KOP to be turned on and no charging plug gun CC2 signal or power switch ACC signal exists, the BMS battery management system enters a standby sleep mode to wait for external operation to charge or discharge. Under this mode, BMS battery management system 101 monitors battery system voltage or sets for the parameter through inside intelligent control, when setting for the shutdown time delay then or battery system voltage low-time, BMS battery management system 101 automatic protection battery is overdischarged and is got into and be about to the mode of shutting down and carry out the system shutdown protection, and the internal switch of disconnection BMS makes outside BMS switch KOP invalid.
In the discharging state or the charging state, the BMS battery management system 101 monitors the state of the battery system, and when the battery system has an excessive temperature, an abnormal voltage or a fire detection fault, the BMS battery management system 101 goes to the system fault state, forcibly turns off the charge allowing relay 1051 in the charge allowing interface unit 105 or the objection allowing relay 1061 in the discharge allowing interface unit 106 or turns off the BMS internal power switch, thereby realizing an immediate shutdown mode of the system.
After the BMS system has passed the initial self-test, it enters a standby sleep mode, and referring to fig. 6, which is a flow chart of the series-parallel conversion control of the battery charging and discharging management method of the present invention, preferably, when the charging detection unit 201 detects a charging pistol signal CC2, the BMS battery management system 101 forcibly turns off the discharging allowing interface unit 106 to interrupt the discharging allowing relay, and at the same time, it determines that the charging mode switch H/L configuration is suitable for the charging mode one, low-voltage parallel charging of the current airport charger; or in a charging mode II, high-voltage series charging is carried out; when the charging detection unit 201 does not charge the electric gun acknowledgement signal CC2, the state of the power supply switch ACC in the discharging detection unit 202 is determined, and the battery pack serial-parallel conversion unit 104 is controlled to perform parallel connection in an interlocking manner to ensure that the battery system works at the first power voltage V1Mode, a low voltage "safe" discharge of the battery is performed.
The main technical scheme of the embodiment provided by the invention shows the components and the connection relation among the components and the provided method. The invention can achieve the technical effects that: the modular battery pack is mainly adopted to provide power supply voltages of different battery systems when batteries are connected in series and in parallel, and the special series and parallel switching circuit provided by the invention is adopted, so that different charging voltage ranges of different charging equipment in an airport can be flexibly matched by adopting the battery charging and discharging management device or method provided by the invention, and a corresponding charging mode and a corresponding switching circuit are selected, thereby realizing safe charging under low voltage and high voltage; in addition, in the power supply (or discharge) mode, a low-voltage electric control and motor system which is commonly used by the current airport ground special equipment can be maintained.
The above-mentioned embodiments and the accompanying drawings are only for illustrating the technical solutions and effects of the present invention, and are not to be construed as limiting the present invention. It is to be understood that those skilled in the art can modify and change the above-described embodiments without departing from the technical spirit and scope of the present invention as defined in the appended claims.

Claims (11)

1. A power battery charge and discharge management system is characterized by comprising:
the modular battery pack is used for providing a battery pack with rated voltage of electric equipment;
the power battery charging and discharging management device is used for receiving control signals of a charging detection unit or a discharging battery unit on the electric equipment and is linked with the selection circuit to discharge the electric equipment from the modular battery pack or charge the modular battery pack by the charging equipment;
the battery pack series-parallel connection conversion unit is used for series connection or parallel connection through the battery pack series-parallel connection conversion unit according to a high-voltage mode or a low-voltage mode established by a charging detection unit or a discharging detection unit of the electric equipment.
2. The power battery charge and discharge management system of claim 1, wherein the rated voltage of the electric equipment is a nominal voltage value of the modular battery pack; the modularized battery pack comprises a battery anode connecting point, a battery cathode connecting point, a quick overhaul fuse, a battery on-off relay, a battery data acquisition unit, a battery heating pad, a battery data interface, a micro-spark ultraviolet detector and a fire extinguishing control interface.
3. The power battery charging and discharging management system according to claim 1, wherein the power battery charging and discharging management device comprises a battery management system, a control power supply and interlock control unit, a battery pack interface unit, a battery pack serial-parallel conversion unit, a charging permission interface unit and a discharging interface circuit.
4. The power battery charge and discharge management system of claim 3, wherein the battery pack interface unit comprises a positive connection point, a negative connection point, a battery data interface, a fire suppression control interface, and a battery management system status indicator for connecting the modular battery pack; the discharging allows the interface unit to supply power to the electric equipment for output; receiving the charging of the modular battery pack by the charging device through the charging permission interface unit; and the battery management system is used for carrying out mode identification and controlling charging and discharging, safety management and data storage of the power battery.
5. The power battery charge and discharge management system according to one of claims 1 to 4, wherein the battery pack series-parallel conversion unit is capable of performing battery pack series-parallel connection to obtain two different nominal voltages of the battery system;
when the N battery packs are connected in parallel through the battery pack serial-parallel connection conversion unit, the nominal voltage value of the battery system is the rated voltage value of a single modularized battery pack, and the nominal voltage value is a low-voltage mode;
when the N battery packs are connected in series through the battery pack series-parallel connection conversion unit, the nominal voltage value of the battery system is N times of the rated voltage of the single modularized battery pack, and the battery system is in a high-voltage mode.
6. The power battery charging and discharging management system according to claim 3,
the battery pack serial-parallel connection conversion is controlled by the battery management system according to the discharge state of the electric equipment discharge detection unit and the charge mode switch state of the charge detection unit;
the parallel connection of the battery packs is determined by the discharge state of the discharge detection unit of the electric equipment and the charge mode switch state of the charge detection unit, namely the battery packs are in a low-voltage mode, and the rated voltage is the nominal voltage of a single modular battery pack;
the battery pack is connected in series and is determined by the charging mode switch state II of the charging detection unit, namely the battery pack is in a high-voltage mode, and the rated voltage is N times of the nominal voltage of a single modular battery pack.
7. The power battery charging and discharging management system according to claim 3,
the battery pack series-parallel connection conversion unit comprises a first relay control circuit and a second relay control circuit; the first relay control circuit is connected with a relay power supply contact and a relay electromagnetic coil in parallel; the second relay control circuit is connected with a relay power supply contact and an electromagnetic coil in series; the first relay and the second relay control circuit are controlled by a battery management system, and a control power supply and an interlocking control unit provide power supplies;
the control power supply and interlocking control unit is provided with a power supply unit and serial-parallel interlocking detection control, wherein the power supply unit comprises a direct current-direct current converter and converts the nominal voltage of the battery pack into the control power supply voltage of the battery management system; the series-parallel connection interlocking detection control is used for detecting the control states of a first relay and a second relay;
the number N of the battery packs is at least two, and each battery pack comprises a positive electrode connecting point and a negative electrode connecting point;
the relay comprises N-1 series relays and 2N-2 parallel relays;
the parallel relay further comprises a parallel normally open contact, and the series relay further comprises a series normally open contact;
the first relay control circuit is a battery pack parallel control circuit, and the positive pole connection points of the modular battery packs are connected through parallel relay normally open contacts; the negative pole connecting points are connected through a normally open contact of a parallel relay; 2N-2 normally open contacts of the parallel relays are closed, and N-1 normally open contacts of the series relays are opened, so that the modular battery packs are connected in parallel;
the second relay control circuit is a battery pack series connection control circuit, the modular battery packs are numbered in sequence, and N-1 pairs of positive/negative electrode connection points of the two battery packs which are adjacent in sequence are connected through a normally open contact of a series relay; and the normally open contacts of the N-1 series relays are closed and the normally open contacts of the 2N-2 parallel relays are opened, so that the modular battery packs are connected in series.
8. The power battery charging and discharging management system according to claim 3, 4, 6 or 7, further comprising:
the discharge detection unit comprises a battery management system control power switch and a power supply switch;
the charging detection unit comprises a charging electric gun signal and a high-low voltage mode switch;
the battery management system controls a power switch and a power supply switch, and a charging lance inserting signal is linked with a high-low voltage mode switch to determine the system state of the battery management system and perform battery charging and discharging management;
the battery pack serial-parallel conversion unit is connected with a first relay control coil in parallel in a discharging and charging mode, and the battery pack serial-parallel conversion unit is connected with a second relay control coil in series in a charging mode;
the charging permission interface unit comprises a charging permission control relay, is connected with external charging equipment, and controls the charging permission control relay in a charging state after the series-parallel connection of the battery packs is completed;
the discharge permission interface unit comprises a discharge permission control relay, is connected with external electric equipment, and controls the discharge permission control relay in a discharge state after the series-parallel connection of the battery packs is completed.
9. A power battery charging and discharging management method is characterized by comprising the following steps:
in the charge mode of the battery, the battery is charged,
the charging detection unit judges whether the voltage value of the power supply of the external charging equipment is a first voltage value or a second voltage value larger than the first voltage value according to the charging insertion state and the charging mode switch state;
if the voltage value of the power supply of the external charging equipment is a first voltage value, selecting a first mode for charging;
and if the power supply voltage value of the external charging equipment is greater than the first voltage value, selecting a second mode for charging.
10. The power battery charging and discharging management method according to claim 9, wherein at least two battery packs are charged for the second mode; the first voltage value is set as the voltage charging of a single battery pack or the parallel charging of a plurality of battery packs;
in the first mode, all the battery packs are connected in parallel;
in the second mode, the battery packs are connected in series.
11. The power battery charging and discharging management method according to claim 9, further comprising:
a charging and discharging mode detection step, wherein the charging detection unit and the discharging detection unit are used for judging that the battery system is in a discharging mode;
in the discharge mode of the battery, the battery is,
through discharge detection unit state detection and series-parallel linkage control, each battery pack is connected in parallel, and the discharge permission interface unit closes the discharge permission relay to provide low-voltage power supply for the electric equipment.
CN202010938310.3A 2020-09-09 2020-09-09 Power battery charging and discharging management system and method thereof Pending CN114228562A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115313542A (en) * 2022-07-18 2022-11-08 湖南晟和电源科技有限公司 High charge-discharge management device of security
CN116666788A (en) * 2023-07-31 2023-08-29 苏州融硅新能源科技有限公司 Battery pack, management method thereof and battery management system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115313542A (en) * 2022-07-18 2022-11-08 湖南晟和电源科技有限公司 High charge-discharge management device of security
CN116666788A (en) * 2023-07-31 2023-08-29 苏州融硅新能源科技有限公司 Battery pack, management method thereof and battery management system
CN116666788B (en) * 2023-07-31 2023-10-27 苏州融硅新能源科技有限公司 Battery pack, management method thereof and battery management system

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