CN115441549A - Series-parallel battery management system and control method - Google Patents

Series-parallel battery management system and control method Download PDF

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Publication number
CN115441549A
CN115441549A CN202211166054.6A CN202211166054A CN115441549A CN 115441549 A CN115441549 A CN 115441549A CN 202211166054 A CN202211166054 A CN 202211166054A CN 115441549 A CN115441549 A CN 115441549A
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China
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power supply
battery
battery management
unit
charging
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向俊侨
周攀
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Sichuan Core Power Technology Co ltd
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Sichuan Core Power Technology Co ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H02J7/0024—Parallel/serial switching of connection of batteries to charge or load circuit
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention relates to the technical field of battery management systems, in particular to a series-parallel battery management system which comprises a power supply unit, wherein the power supply unit comprises a battery management unit, a charging and discharging unit and a battery module, the battery module comprises at least two rechargeable batteries which are connected in series, the charging and discharging unit is connected with the battery module, the charging and discharging unit is controlled by the battery management unit, and the battery management unit is connected with the battery module.

Description

Series-parallel battery management system and control method
Technical Field
The invention relates to the technical field of battery management systems, in particular to a series-parallel battery management system and a control method.
Background
The battery management system is commonly called as a battery nurse or a battery manager, and mainly aims to intelligently manage and maintain each power supply module, prevent the battery from being overcharged and overdischarged, prolong the service life of the battery, monitor the state of the battery, the current battery management system can be matched with a plurality of groups of power supply modules connected in parallel to form the power supply system, but the used power supply modules are mostly electric cores of the same type, when different electric cores are used for being connected in series to form one power supply module, the monomer voltage of different electric cores can cause larger pressure difference between the power supply modules connected in parallel, because the internal resistance of the battery is almost zero, when the pressure difference is larger, the power supply modules can cause short circuit to cause damage inside the battery when connected in parallel.
Disclosure of Invention
The invention provides a series-parallel battery management system and a control method, aiming at solving the problem that a battery is damaged due to large differential pressure after power supply modules are connected in parallel.
The utility model provides a series-parallel battery management system, includes the power supply unit, the power supply unit includes battery management unit, charge and discharge unit and battery module, battery module is including two at least chargeable batteries of establishing ties, charge and discharge unit connects battery module, and charge and discharge unit is controlled by battery management unit, battery management unit connects battery module.
Furthermore, the charging and discharging unit is connected with the battery module in series, the charging and discharging unit is connected with a controllable switch in parallel, and the controllable switch is controlled by the battery management unit.
Further, the power supply unit further comprises a current sensor, the current sensor is used for detecting the output current and/or the charging current of the battery module, and the current sensor is connected with the battery management unit.
Furthermore, the battery module is connected with a high-speed CAN signal input end of the battery management unit through a CAN bus, and the charging and discharging unit is connected with a low-speed CAN signal input end of the battery management unit through the CAN bus.
Further, the charging and discharging unit comprises a charging branch and a discharging branch, the charging branch is provided with a charging switch, the discharging branch is provided with a discharging switch, the charging switch and the discharging switch are controlled by the battery management unit, the charging branch and the discharging branch are connected with a pre-charging resistor, and the charging switch and the discharging switch are respectively connected with a diode in series in the forward direction.
Further, the rechargeable battery is a lithium iron phosphate battery, a ternary lithium battery or a lead-acid battery, and the controllable switch, the discharge switch and the charge switch include, but are not limited to, a relay, a triode, an IGBT or an MOS transistor.
Further, at least two power supply units are included in parallel.
A control method of a series-parallel battery management system is suitable for the battery management system and comprises the following steps:
s1, respectively acquiring data of a battery module in a power supply unit of the other side through CAN communication when at least two groups of power supply units are connected in parallel;
s2, the battery management unit judges whether the battery modules connected in parallel with the power supply unit are in a charging state or a discharging state according to the data of the battery modules in the power supply unit;
s3, the battery management unit controls the CAN bus switch to be turned off to stop data acquisition, and controls the switch of the charging and discharging unit to be turned on, so that the battery module in a discharging state is charged to the battery module in a charging state;
s4, the battery management unit controls a switch of the charging and discharging unit to be switched off to stop charging and discharging among the battery modules, controls a CAN bus switch to be switched on and collects data of the battery modules in the power supply unit of the other side again;
and S5, repeating the steps S2-S4 until the total voltage between at least two groups of battery modules is less than 5V and the branch current is more than 5A, controlling the switch to be closed by the battery management unit, enabling the charging and discharging unit to be in short circuit, and completing charging and discharging management among the groups of battery modules.
Further, the step S1 specifically includes: after the power supply units are connected in parallel, the battery management units of each group of battery units exchange data through CAN buses connected to the anode and the cathode of the battery module, and the conduction of each CAN bus is controlled by a CAN bus switch on the side of the battery management unit in the data exchange process.
Further, the step S3 specifically includes:
the controllable switches are disconnected, after the battery management unit of each group of battery units receives data of battery modules in other battery units, the battery management unit controls the CAN bus switch to be disconnected and controls the switches of the charging and discharging units to be closed, and the data comprise the voltage of the battery modules, namely the highest monomer voltage and the lowest monomer voltage of the battery modules in the power supply units, the total voltage after the parallel connection of the power supply units and the current of each group of power supply units;
when the lowest monomer voltage of a battery module in the power supply module is greater than the lowest preset voltage, the highest monomer voltage is less than the highest preset voltage and the current is less than a first preset current, the discharge switch and the charge switch of the charge-discharge unit are both closed, the parallel power supply units all work normally, and the high-voltage power supply unit charges the low-voltage power supply unit;
when the lowest monomer voltage of the battery modules in the 1 group of power supply units is smaller than the lowest preset voltage and the highest monomer voltage is smaller than the highest preset voltage, the discharge switch of the charge and discharge unit is switched off, the charge switch is switched on, and only the group of power supply units are allowed to charge;
when the highest monomer voltage of the battery modules in the 1 group of power supply units is greater than the highest preset voltage and the lowest monomer voltage is greater than the lowest preset voltage, the discharge switch of the charge and discharge unit is closed, the charge switch is opened, and only the group of power supply units are allowed to discharge;
when the lowest monomer voltage of the battery modules in each group of power supply units is greater than the lowest preset voltage, the highest monomer voltage is less than the highest preset voltage and the current is less than the second preset current, the total voltage of the multiple groups of power supply units connected in parallel is balanced, and charging and discharging are completed.
Further, the step S4 specifically includes:
after the charging and discharging process of the step S3 lasts for 1S-2S, the battery management units of each group of power supply units control the CAN bus switches to be switched on and off, and simultaneously control the switches of the charging and discharging units to be switched off, and the battery management units of each group of power supply units exchange the highest monomer voltage and the lowest monomer voltage of the battery modules in the power supply units of the other party, the total voltage after the power supply units are connected in parallel and the current of each group of power supply units through CAN communication.
Further, the step S5 specifically includes:
the power supply unit judges the battery module data collected in the step S4 through the battery management unit, when the total voltage of at least two groups of power supply units connected in parallel is less than 5V and the current of at least two groups of power supply units is greater than 5A, the battery management unit of each group of power supply units controls the controllable switch to be closed, so that each group of power supply units are connected in parallel, the total voltage of the power supply units connected in parallel is consistent, and meanwhile, the power supply units connected in parallel stop charging and discharging mutually.
The invention has the beneficial effects that:
(1) The series-parallel battery management system can be connected with different types of battery cores in series to form a power supply module, so that the problem of battery damage caused by large voltage difference can be avoided after the power supply modules with different monomer voltages are connected in parallel;
(2) The hybrid battery management system provided by the invention can be used for increasing or reducing the number of power supply modules at will, reducing the cost of replacing the power supply modules by the whole battery management system and improving the service efficiency of the battery;
(3) According to the control method of the series-parallel battery management system, the CAN communication and the BCU are matched to perform internal voltage regulation on the plurality of groups of power supply modules before parallel connection, so that the parallel connection of the power supply modules is performed after no voltage difference exists between each group of power supply modules, and the safety of the battery management system is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a system block diagram of a hybrid battery management system according to the present invention;
fig. 2 is a schematic diagram of a charging and discharging unit of a series-parallel battery management system according to the present invention;
fig. 3 is a flowchart of a control method of a hybrid battery management system according to the present invention;
fig. 4 is a schematic structural diagram of a terminal device of a hybrid battery management system according to the present invention;
fig. 5 is a schematic structural diagram of a computer-readable storage medium of a hybrid battery management system according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
Referring to fig. 1-2, the present invention provides a hybrid battery management system, including a power supply unit, where the power supply unit includes a battery management unit, a charge and discharge unit, and a battery module, where the battery module is a 12V100AH power supply unit formed by connecting 4 lithium iron phosphate batteries in series, the charge and discharge unit is connected to the battery module, the charge and discharge unit is controlled by the battery management unit, and the battery management unit is connected to the battery module, where the power supply unit may further include a 24V100AH power supply unit, a 48V100AH power supply unit, a 72V100AH power supply unit, and the like in series according to different application scenarios;
the total positive and negative poles of the battery modules in the power supply units of 12v100AH are connected in parallel, the positive pole of the power supply unit of 12v100AH is connected with the high-speed CAN signal input end of the battery management unit through a CAN bus, the negative pole of the power supply unit of 12v100AH is respectively connected with one end of the charge and discharge unit and one end of the switch, the other end of the charge and discharge unit is respectively connected with the other end of the switch and one end of the current sensor, and the other end of the charge and discharge unit is connected with the low-speed CAN signal input end of the battery management unit through the CAN bus.
Example 2
Referring to fig. 3, on the basis of embodiment 1, this embodiment proposes a control method of a hybrid battery management system, including the following steps:
a control method of a series-parallel battery management system is suitable for the battery management system and comprises the following steps:
s1, respectively acquiring data of a battery module in a power supply unit of the other side through CAN communication when at least two groups of power supply units are connected in parallel;
s2, the battery management unit judges whether the battery modules connected in parallel with the power supply unit are in a charging state or a discharging state according to the data of the battery modules in the power supply unit;
s3, the battery management unit controls the CAN bus switch to be turned off to stop data acquisition, and controls the switch of the charging and discharging unit to be turned on, so that the battery module in a discharging state is charged to the battery module in a charging state;
s4, the battery management unit controls a switch of the charging and discharging unit to be switched off to stop charging and discharging among the battery modules, controls a CAN bus switch to be switched on and collects data of the battery modules in the power supply unit of the other side again;
and S5, repeating the steps S2-S4 until the total voltage between at least two groups of battery modules is less than 5V and the branch current is more than 5A, controlling the switch to be closed by the battery management unit, enabling the charging and discharging unit to be in short circuit, and completing charging and discharging management among the groups of battery modules.
Further, the step S1 specifically includes: after the power supply units are connected in parallel, the battery management units of each group of battery units exchange data through CAN buses connected to the anode and the cathode of the battery module, and the conduction of each CAN bus is controlled by a CAN bus switch on the side of the battery management unit in the data exchange process.
Further, the step S3 specifically includes:
the controllable switches are disconnected, after the battery management units of each group of battery units receive data of battery modules in other battery units, the battery management units control the CAN bus switches to be disconnected and control the switches of the charging and discharging units to be closed, and the data comprise the voltages of the battery modules, namely the highest monomer voltage and the lowest monomer voltage of the battery modules in the power supply units, the total voltage after the parallel connection of the power supply units and the current of each group of power supply units;
when the lowest monomer voltage of a battery module in the power supply module is greater than the lowest preset voltage by 2.6V, the highest monomer voltage is less than the lowest preset voltage by 3.65V and the current is less than the first preset current by 1A, the discharge switch and the charge switch of the charge-discharge unit are both closed, the parallel power supply units all work normally, and the high-voltage power supply unit charges the low-voltage power supply unit;
when the lowest monomer voltage of the battery modules in 1 group of power supply units is less than the lowest preset voltage of 2.6V and the highest monomer voltage is less than the lowest preset voltage of 3.65V, the discharge switch of the charge and discharge unit is switched off, the charge switch is switched on, and only the group of power supply units are allowed to charge;
when the highest monomer voltage of the battery modules in 1 group of power supply units is greater than the lowest preset voltage by 3.65V and the lowest monomer voltage is greater than the lowest preset voltage by 2.6V, the discharge switch of the charge and discharge unit is closed, the charge switch is opened, and only the group of power supply units are allowed to discharge;
when the lowest monomer voltage of the battery modules in each group of power supply units is greater than the lowest preset voltage by 2.6V, the highest monomer voltage is less than the lowest preset voltage by 3.65V and the current is less than the second preset current by 0.3A, the total voltage of the multiple groups of power supply units connected in parallel is balanced, and charging and discharging are completed.
Further, the step S4 specifically includes:
after the charging and discharging process of the step S3 lasts for 1S-2S, the battery management units of each group of power supply units control the CAN bus switches to be switched on and off, and simultaneously control the switches of the charging and discharging units to be switched off, and the battery management units of each group of power supply units exchange the highest monomer voltage and the lowest monomer voltage of the battery modules in the power supply units of the other party, the total voltage after the power supply units are connected in parallel and the current of each group of power supply units through CAN communication.
Further, the step S5 specifically includes:
the power supply unit judges the battery module data collected in the step S4 through the battery management unit, when the total voltage of at least two groups of power supply units connected in parallel is less than 5V and the current of at least two groups of power supply units is greater than 5A, the battery management unit of each group of power supply units controls the controllable switch to be closed, so that each group of power supply units are connected in parallel, the total voltage of the power supply units connected in parallel is consistent, and meanwhile, the power supply units connected in parallel stop charging and discharging mutually.
Taking two groups of power supply units connected in parallel in embodiment 1 as an example, when the total positive and the total negative of two groups of 12V100AH power supply units are connected with each other, the discharging switch K1 and the charging switch K2 in the switch and the charging and discharging unit are both in an off state, the CAN bus switch is closed to perform CAN communication when the two groups of 12V100AH power supply units are off, the data such as the cell voltage and the current of the battery module in the other power supply unit CAN be known between the two groups of 12V100AH power supply units through the battery management unit, then the CAN bus switch is opened, the discharging switch K1 and the charging switch K2 are closed, that is, the total voltage of the 12V100AH power supply unit 1 is higher than the total voltage of the 12V100AH power supply unit 2, the discharging switch 1 in the 12V100AH power supply unit 1 is closed, the charging switch 2 is closed to perform charging, the battery module with the total voltage higher than the total voltage is charged for a few seconds, then the discharging switch 1 in the 12V100AH power supply unit 1 and the 12V100AH power supply unit 2 are opened, the charging switch 2 is closed to perform charging and charging, the two groups of the battery modules are not directly controlled through the charging and discharging switch K5, and the charging and discharging of the two groups of the battery modules are judged, and the two groups of the CAN be directly performed through the charging and discharging switch. When the current is larger than 5A, the battery management unit controls the controllable switch to be closed, wherein the purpose of CAN communication between the two groups of 12V100AH power supply units is to ensure that the two groups of 12V100AH power supply units are in a safe voltage range when connected in parallel, the safe voltage range is that the voltage difference of the two groups of 12V100AH power supply units is close to 0, the method protects the cell voltage of the battery module in the power supply units and also protects the overall voltage of the power supply units after being connected in parallel, when the lowest voltage of the cell voltage is discharged to reach the lowest cut-off voltage, the discharge is not allowed, and when the highest voltage of the cell voltage is charged to reach the highest cut-off voltage, the charge is not allowed.
Example 3
As shown in fig. 4, the present embodiment provides a terminal device of a hybrid battery management system, and the terminal device 200 includes at least one memory 210, at least one processor 220, and a bus 230 connecting different platform systems.
The memory 210 may include readable media in the form of volatile memory, such as Random Access Memory (RAM) 211 and/or cache memory 212, and may further include Read Only Memory (ROM) 213.
The memory 210 further stores a computer program, and the computer program can be executed by the processor 220, so that the processor 220 executes any one of the hybrid battery management systems in the embodiments of the present application, and a specific implementation manner of the hybrid battery management system is consistent with the implementation manner and the achieved technical effect described in the embodiments, and details of the implementation manner are not repeated. Memory 210 may also include a program/utility 214 having a set (at least one) of program modules 215, such program modules including but not limited to: an operating system, one or more application programs, other program modules, and program data, each of which, or some combination thereof, may comprise an implementation of a network environment.
Accordingly, processor 220 may execute the computer programs described above, as well as may execute programs/utilities 214.
Bus 230 may be a local bus representing one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, a processor, or any other type of bus structure.
Terminal device 200 may also communicate with one or more external devices 240, such as a keyboard, pointing device, bluetooth device, etc., as well as with one or more devices capable of interacting with terminal device 200, and/or with any device (e.g., router, modem, etc.) that enables terminal device 200 to communicate with one or more other computing devices. Such communication may occur via an input/output (I/O) interface 250. Also, the terminal device 200 may communicate with one or more networks (e.g., a Local Area Network (LAN), a Wide Area Network (WAN), and/or a public network such as the internet) through the network adapter 260. The network adapter 260 may communicate with other modules of the terminal device 200 via the bus 230. It should be understood that although not shown in the figures, other hardware and/or software modules may be used in conjunction with terminal device 200, including but not limited to: microcode, device drivers, redundant processors, external disk drive arrays, RAID systems, tape drives, and data backup storage platforms, to name a few.
Example 4
As shown in fig. 5, the present embodiment provides a computer-readable storage medium of a hybrid battery management system, where the computer-readable storage medium has stored thereon instructions, and the instructions, when executed by a processor, implement any one of the hybrid battery management systems. The specific implementation manner is consistent with the implementation manner and the achieved technical effect described in the above embodiments, and some contents are not described again.
Fig. 5 shows a program product 300 for implementing the method provided in this embodiment, which may employ a portable compact disc read only memory (CD-ROM) and include program codes, and may be executed on a terminal device, such as a personal computer. However, the program product 300 of the present invention is not so limited, and in this document, a readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. Program product 300 may employ any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the readable storage medium include: an electrical connection having one or more wires, a portable disk, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
A computer readable storage medium may include a propagated data signal with readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A readable storage medium may also be any readable medium that is not a readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. Program code embodied on a readable storage medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing. Program code for carrying out operations for aspects of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computing device, partly on the user's device, as a stand-alone software package, partly on the user's computing device and partly on a remote computing device, or entirely on the remote computing device or server. In the case of a remote computing device, the remote computing device may be connected to the user computing device through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computing device (e.g., through the internet using an internet service provider).
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (10)

1. The utility model provides a series-parallel battery management system which characterized in that, includes the power supply unit, the power supply unit includes battery management unit, charge and discharge unit and battery module, battery module is including two at least rechargeable batteries of establishing ties, charge and discharge unit connects battery module, and charge and discharge unit is controlled by battery management unit, battery management unit connects battery module.
2. The series-parallel battery management system according to claim 1, wherein the charging and discharging unit is connected in series with the battery module, and the charging and discharging unit is connected in parallel with a controllable switch, and the controllable switch is controlled by the battery management unit.
3. The series-parallel battery management system according to claim 1 or 2, wherein the power supply unit further comprises a current sensor for detecting an output current and/or a charging current of the battery module, and the current sensor is connected to the battery management unit.
4. The series-parallel battery management system according to claim 3, wherein the battery module is connected to the CAN signal input terminal of the battery management unit through a CAN bus, and the CAN bus is the same as the connection line of the positive electrode and the negative electrode of the battery module.
5. The system according to claim 2, wherein the charging and discharging unit comprises a charging branch and a discharging branch, the charging branch is provided with a charging switch, the discharging branch is provided with a discharging switch, the charging switch and the discharging switch are both controlled by the battery management unit, the charging branch and the discharging branch are both connected with a pre-charging resistor, and the charging switch and the discharging switch are respectively connected with a diode in series in a forward direction.
6. The system according to claim 5, wherein the rechargeable battery is a lithium iron phosphate battery, a ternary lithium battery or a lead-acid battery, and the controllable switch, the discharge switch and the charge switch include, but are not limited to, a relay, a transistor, an IGBT or a MOS transistor.
7. The series-parallel battery management system according to claim 3, comprising at least two power supply units connected in parallel, wherein the power supply units are charged and discharged at the same port.
8. A control method of a series-parallel battery management system, characterized in that the control method is adapted to the battery management system according to claim 7, comprising the steps of:
s1, when at least two groups of power supply units are connected in parallel, data of a battery module in the power supply unit of the other side are collected through CAN communication respectively;
s2, the battery management unit judges whether the battery modules connected in parallel with the power supply unit are in a charging state or a discharging state according to the data of the battery modules in the power supply unit;
s3, the battery management unit controls the CAN bus switch to be switched off to stop data acquisition, and controls the switch of the charge and discharge unit to be switched on, so that the battery module in a discharge state charges the battery module in a charge state;
s4, the battery management unit controls the switch of the charging and discharging unit to be switched off to stop charging and discharging among the battery modules, controls the CAN bus switch to be switched on and then acquires data of the battery modules in the power supply unit of the other side;
and S5, repeating the steps S2-S4 until the total voltage between at least two groups of battery modules is less than 5V and the branch current is more than 5A, controlling the switch to be closed by the battery management unit, enabling the charging and discharging unit to be in short circuit, and completing charging and discharging management among the groups of battery modules.
9. The method for controlling a series-parallel battery management system according to claim 8, wherein the step S1 specifically includes: after the power supply units are connected in parallel, the battery management units of each group of battery units exchange data through CAN buses connected to the anode and the cathode of the battery module, and the conduction of each CAN bus is controlled by a CAN bus switch on the side of the battery management unit in the data exchange process.
10. The method for controlling a series-parallel battery management system according to claim 8, wherein the step S3 specifically includes:
the controllable switches are disconnected, after the battery management units of each group of battery units receive data of battery modules in other battery units, the battery management units control the CAN bus switches to be disconnected and control the switches of the charging and discharging units to be closed, and the data comprise the voltages of the battery modules, namely the highest monomer voltage and the lowest monomer voltage of the battery modules in the power supply units, the total voltage after the parallel connection of the power supply units and the current of each group of power supply units;
when the lowest monomer voltage of a battery module in the power supply module is greater than the lowest preset voltage, the highest monomer voltage is less than the highest preset voltage and the current is less than a first preset current, the discharge switch and the charge switch of the charge-discharge unit are both closed, the parallel power supply units all work normally, and the high-voltage power supply unit charges the low-voltage power supply unit;
when the lowest monomer voltage of the battery modules in the 1 group of power supply units is smaller than the lowest preset voltage and the highest monomer voltage is smaller than the highest preset voltage, the discharge switch of the charge and discharge unit is switched off, the charge switch is switched on, and only the group of power supply units are allowed to charge;
when the highest monomer voltage of the battery modules in the 1 group of power supply units is greater than the highest preset voltage and the lowest monomer voltage is greater than the lowest preset voltage, the discharge switch of the charge and discharge unit is closed, the charge switch is opened, and only the group of power supply units are allowed to discharge;
when the lowest monomer voltage of the battery modules in each group of power supply units is greater than the lowest preset voltage, the highest monomer voltage is less than the highest preset voltage and the current is less than a second preset current, the total voltage of the plurality of groups of power supply units connected in parallel is balanced, and charging and discharging are completed;
the step S4 specifically includes:
after the charging and discharging process of the step S3 lasts for 1S-2S, the battery management units of each group of power supply units control the CAN bus switches to be switched on and off, and simultaneously control the switches of the charging and discharging units to be switched off, and the battery management units of each group of power supply units exchange the highest monomer voltage and the lowest monomer voltage of the battery modules in the power supply units of the other party, the total voltage after the power supply units are connected in parallel and the current of each group of power supply units through CAN communication;
the step S5 specifically includes:
the power supply unit judges the battery module data collected in the step S4 through the battery management unit, when the total voltage of at least two groups of power supply units after being connected in parallel is less than 5V and the current of at least two groups of power supply units is more than 5A, the battery management unit of each group of power supply units controls the controllable switch to be switched on, so that each group of power supply units are connected in parallel, the total voltage of the power supply units after being connected in parallel is consistent, and meanwhile, the power supply units connected in parallel stop charging and discharging mutually.
CN202211166054.6A 2022-09-23 2022-09-23 Series-parallel battery management system and control method Pending CN115441549A (en)

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